CN111928043A

CN111928043A - Center swivel joint, hydraulic control system and work vehicle

Info

Publication number: CN111928043A
Application number: CN202010761325.7A
Authority: CN
Inventors: 贺电; 谭贤文; 耿晓晨
Original assignee: Sany Automobile Manufacturing Co Ltd
Current assignee: Sany Automobile Manufacturing Co Ltd
Priority date: 2020-07-31
Filing date: 2020-07-31
Publication date: 2020-11-13
Anticipated expiration: 2040-07-31
Also published as: WO2022021517A1; CN111928043B

Abstract

The invention provides a center swivel joint, a hydraulic control system and a working vehicle, wherein the center swivel joint comprises: the first revolving body is internally provided with a first oil duct and a second oil duct; the second revolving body is sleeved on the outer side of the first revolving body, can rotate relative to the first revolving body, and is provided with a first oil port and a second oil port; the first annular groove is formed in the second revolving body, and the first oil port is communicated with the first annular groove; the second annular groove is arranged on the second revolving body, and the second oil port is communicated with the second annular groove; the first oil duct is communicated with one of the first annular groove and the second annular groove, and the second oil duct is communicated with the other one of the first annular groove and the second annular groove. The central rotary joint provided by the invention forms two oil channels, so that the overall dimension of the central rotary joint can be reduced, particularly the axial length of the central rotary joint is shortened, and the weight and the cost of the central rotary joint are reduced.

Description

Center swivel joint, hydraulic control system and work vehicle

Technical Field

The invention relates to the technical field of hydraulic pressure, in particular to a center swivel joint, a hydraulic control system and a working vehicle.

Background

A construction machine (e.g., an excavator, a crane, a pump truck) with a swing mechanism generally includes a fixed part (lower mount) and a swing part (upper mount), the fixed part is stationary, and the swing part needs to perform a swing operation. The hydraulic oil power source and the power source are generally arranged on the fixed part. Hydraulic oil, which controls the swing portion, and electrical signals need to be transmitted from the stationary system to the swing portion. In the prior art, hydraulic oil is passed through a hose and an electrical signal is sent to a rotating part using electrical wires to transmit the associated power and signal. When the rotary part performs rotary operation, the rubber tube and the electric wire which are connected with the fixed part and the rotary part can be mutually wound, so that the rubber tube and the electric wire are easy to damage, and the rotary range of the rotation is limited.

However, with the continuous change of market demands, the tonnage of the engineering machinery is gradually increased, so that the pressure and the flow of a hydraulic system of the whole machine are increased, the drift diameter of an oil path of the central rotary joint is also required to be correspondingly increased, the oil groove of the central rotary joint in the prior art is annular and can only provide one oil path, the overall dimension of the central rotary joint is increased, and the weight and the cost of the central rotary joint are also correspondingly increased.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art.

To this end, a first aspect of the invention provides a central swivel joint.

A second aspect of the invention provides a hydraulic control system.

A third aspect of the present invention provides yet another hydraulic control system.

A fourth aspect of the invention provides a work vehicle.

In an aspect of the first aspect of the present invention, the present invention provides a center swivel joint, including: the first revolving body is internally provided with a first oil duct and a second oil duct; the second revolving body is sleeved outside the first revolving body and is rotationally connected with the first revolving body, and a first oil port and a second oil port are formed in the second revolving body; the first annular groove is arranged between the first revolving body and the second revolving body; the second annular groove is arranged between the first revolving body and the second revolving body; the partition plate is arranged between the first annular groove and the second annular groove and used for separating the first annular groove from the second annular groove; the first annular groove and the second annular groove are located on the same radial section of the first revolving body or the second revolving body, the first oil port is communicated with one of the first annular groove and the second annular groove, the second oil port is communicated with the other of the first annular groove and the second annular groove, the first oil duct is communicated with one of the first annular groove and the second annular groove, and the second oil duct is communicated with the other of the first annular groove and the second annular groove.

According to the center rotary joint provided by the invention, the first oil port on the second rotary body is communicated with one of the first annular groove and the second annular groove, and the second oil port on the second rotary body is communicated with the other one of the first annular groove and the second annular groove. The second revolving body can rotate relative to the first revolving body, so that the first oil duct is communicated with one of the first annular groove and the second annular groove, the second oil duct is communicated with the other of the first annular groove and the second annular groove, the first oil duct on the first revolving body can be communicated with one of the first oil port and the second oil port, and the second oil duct can be communicated with the other of the first oil port and the second oil port. The two oil passages are formed by one central rotary joint, the overall dimension of the central rotary joint can be reduced, particularly the axial length of the central rotary joint is shortened, and the weight and the cost of the central rotary joint are reduced.

In the use process of the central swivel joint, hydraulic oil can be connected in through the first oil duct and the second oil duct, the hydraulic oil in the first oil duct is supplied to one of the first annular groove and the second annular groove, and the first oil port and the second oil port are communicated through the first annular groove or the second annular groove. The hydraulic oil of the second oil duct is supplied to the other one of the first annular groove and the second annular groove and is communicated with the other one of the first oil port and the second oil port through the first annular groove or the second annular groove, so that the output of double oil paths can be realized through one center rotary joint, the overall dimension of the center rotary joint can be reduced, particularly the axial length of the center rotary joint is shortened, and the weight and the cost of the center rotary joint are reduced.

In the use process of the center swivel joint, hydraulic oil in a high-pressure state can be input through one of the first oil passage and the second oil passage and returns through the other one of the first oil passage and the second oil passage. For example, hydraulic oil is supplied through the first oil passage, the first oil passage is communicated to one of the first annular groove and the second annular groove, the hydraulic oil is supplied to the hydraulic driving piece through one of the first oil port and the second oil port communicated in the first annular groove or the second annular groove, the hydraulic oil in a low-pressure state enters the central rotary joint through the other of the first oil port and the second oil port, the hydraulic oil is communicated with the first annular groove or the second annular groove and is discharged through the second oil passage, the supply and the return of the hydraulic oil can be realized through the arrangement of the central rotary joint, the overall size of the central rotary joint can be reduced, particularly, the axial length of the central rotary joint is shortened, and the weight and the cost of the central rotary joint are reduced.

In addition, the central swivel joint in the above technical solution provided by the present invention may further have the following additional technical features:

in the above technical solution, further, the first annular groove and the second annular groove are disposed on the inner circumferential surface of the second rotation body, the first oil port is communicated with the first annular groove, the second oil port is communicated with the second annular groove, the first oil passage is communicated with one of the first annular groove and the second annular groove, and the second oil passage is communicated with the other of the first annular groove and the second annular groove. Or the first annular groove and the second annular groove are arranged on the peripheral surface of the first revolving body, the first oil duct is communicated with the first annular groove, the second oil duct is communicated with the second annular groove, the first oil port is communicated with one of the first annular groove and the second annular groove, and the second oil port is communicated with the other of the first annular groove and the second annular groove.

In the technical scheme, the arrangement positions of the first annular groove and the second annular groove are further provided. Under the condition that the first annular groove and the second annular groove are arranged on the inner circumferential surface of the second revolving body, the first oil port on the second revolving body is communicated with the first annular groove, and the second oil port on the second revolving body is communicated with the second annular groove. The second revolving body can rotate relative to the first revolving body to drive the first annular groove and the second annular groove to rotate relative to the first oil duct and the second oil duct of the first revolving body, and the first oil duct is communicated with one of the first annular groove and the second oil duct is communicated with the other one of the first annular groove and the second annular groove. Under the condition that the first annular groove and the second annular groove are arranged on the outer peripheral surface of the first revolving body, the first oil duct on the first revolving body is communicated with the first annular groove, the second oil duct on the first revolving body is communicated with the second annular groove, the second revolving body can rotate relative to the first revolving body, the first oil port and the second oil port are driven to rotate relative to the first revolving body, and the first oil port is communicated with one of the first annular groove and the second annular groove.

In any of the above technical solutions, further, the first annular groove and the second annular groove are in multiple layers, and the multiple layers of the first annular groove and the second annular groove are arranged at intervals along the axis direction of the second revolving body; the first oil ports and the second oil ports are multiple and are respectively arranged corresponding to the first annular grooves and the second annular grooves in multiple layers; the first oil duct and the second oil duct are multiple, the multiple first oil ducts and the multiple second oil ducts are divided into multiple groups, and the first annular groove and the second annular groove at the same height are suitable for being matched with the first oil duct and the second oil duct in one group.

In the technical scheme, the first annular grooves and the second annular grooves are further multiple and are arranged at intervals along the height direction of the first revolving body, so that the central revolving joint is of a multilayer structure, double oil ducts can be provided for each layer, the overall dimension of the central revolving joint is further reduced, the weight and the cost of the central revolving joint are reduced, the installation and the layout of the central revolving joint are facilitated, and the engineering vehicle frame is particularly suitable for narrow installation spaces among rotating parts of an engineering vehicle frame.

In any one of the above aspects, further, in a case where the first annular groove and the second annular groove are provided on the inner peripheral surface of the second rotor, the rotor further includes: the third oil duct is arranged in the first rotary body and communicated with one of the first annular groove and the second annular groove; the fourth oil duct is arranged in the first rotary body and communicated with the other one of the first annular groove and the second annular groove; the section of the first revolving body is circular, the first oil duct and the second oil duct are distributed in a centrosymmetric manner by taking the circle center of the section of the first revolving body as a center, and the third oil duct and the fourth oil duct are distributed in a centrosymmetric manner by taking the circle center of the section of the first revolving body as a center. Or the first annular groove and the second annular groove are provided on the outer peripheral surface of the first rotation body, and the first rotation body further includes: the third oil port is arranged in the second rotary body and communicated with one of the first semicircular groove and the second annular groove; the fourth oil port is arranged in the second revolving body and communicated under the condition of the other one of the first semi-annular groove and the second semi-annular groove; the section of the second revolving body is in a circular ring shape, the first oil port and the second oil port are distributed in a centrosymmetric manner by taking the circle center of the section of the second revolving body as a center, and the third oil port and the fourth oil port are distributed in a centrosymmetric manner by taking the circle center of the section of the second revolving body as a center.

In this technical solution, in a case where the first annular groove and the second annular groove are provided on the inner peripheral surface of the second rotation body, the third oil passage and the fourth oil passage are included. Under the condition that the first annular groove and the second annular groove are arranged on the outer peripheral surface of the first revolving body, the first revolving body comprises a third oil port and a fourth oil port.

In the technical scheme, under the condition that the third oil channel and the fourth oil channel are included, layout modes of the first oil channel, the second oil channel, the third oil channel and the fourth oil channel are provided at the same time. In order to avoid hydraulic oil from puncturing the first annular groove and the second annular groove, the first annular groove and the second annular groove are not communicated, and a partition plate is formed between the first annular groove and the second annular groove. This may cause a throttling loss of the hydraulic oil in consideration of the fact that the first oil passage or the second oil passage may be blocked by the partition plate during the rotation relative to the first rotating body. Through the arrangement of the third oil duct and the fourth oil duct, the third oil duct and the first oil duct cannot be shielded by the partition plate at the same time, the fourth oil duct and the second oil duct cannot be shielded by the partition plate at the same time, when the first oil duct is shielded by the partition plate, the third oil duct can be started to replace the first oil duct, when the second oil duct is shielded by the partition plate, the fourth oil duct can be started, and throttling loss of hydraulic oil in the center swivel joint is avoided.

In the technical scheme, the first oil duct and the second oil duct are distributed in a centrosymmetric manner by taking the center of the section of the first revolving body as a center, and the third oil duct and the fourth oil duct are distributed in a centrosymmetric manner by taking the center of the section of the first revolving body as a center. The first oil duct is communicated with one of the first annular groove and the second annular groove, the second oil duct is communicated with the other of the first annular groove and the second annular groove, the third oil duct is communicated with one of the first annular groove and the second annular groove, the fourth oil duct is communicated with the other of the first annular groove and the second annular groove, and the double oil ways of the central rotary joint are formed.

Specifically, the distance between the third oil duct and the first oil duct is greater than the width of the partition plate, and the distance between the fourth oil duct and the second oil duct is greater than the width of the partition plate, so that the third oil duct and the first oil duct are ensured not to be shielded by the partition plate at the same time, and the fourth oil duct and the second oil duct are ensured not to be shielded by the partition plate at the same time.

Specifically, in order to facilitate the rotation of the second revolving body relative to the first revolving body, the first revolving body may be cylindrical, the second revolving body may be ring-shaped, and the first oil port, the second oil port, the first annular groove, the second annular groove, the first oil passage, the second oil passage, the third oil passage and the fourth oil passage are located at the same height in order to ensure the communication effect of the oil passage.

In this technical scheme, under the condition that has included third hydraulic fluid port and fourth hydraulic fluid port, provided the overall arrangement mode of first hydraulic fluid port, second hydraulic fluid port, third hydraulic fluid port and fourth hydraulic fluid port. In order to avoid hydraulic oil from penetrating through the first annular groove and the second annular groove, the first annular groove and the second annular groove are ensured not to be communicated, and a partition plate is formed between the first annular groove and the second annular groove. Consider that there may be first hydraulic fluid port or the second hydraulic fluid port in the gyration for the circumstances that first rotor pivoted in-process was sheltered from by the baffle, may lead to hydraulic oil to produce the throttle loss like this, third hydraulic fluid port and first hydraulic fluid port can not be sheltered from by the baffle simultaneously, when first hydraulic fluid port is sheltered from by the baffle, can launch third hydraulic fluid port and replace first hydraulic fluid port, fourth hydraulic fluid port and second hydraulic fluid port can not be sheltered from by the baffle simultaneously, when the second hydraulic fluid port is sheltered from by the baffle, can launch the fourth hydraulic fluid port, avoid the hydraulic oil in the center swivel joint to produce the throttle loss.

In the technical scheme, the first oil port and the second oil port are distributed in a centrosymmetric manner by using the center of circle of the section of the second revolving body, and the third oil port and the fourth oil port are distributed in a centrosymmetric manner by using the center of circle of the section of the second revolving body. The first oil port is ensured to be communicated with one of the first annular groove and the second annular groove, the second oil port is ensured to be communicated with the other of the first annular groove and the second annular groove, the third oil port is ensured to be communicated with one of the first annular groove and the second annular groove, and the fourth oil port is communicated with the other of the first annular groove and the second annular groove, so that the double oil ways of the central rotary joint are ensured to be formed.

Specifically, the distance between the third oil port and the first oil port is greater than the width of the partition plate, and the distance between the fourth oil port and the second oil port is greater than the width of the partition plate, so that the third oil port and the first oil port are ensured not to be shielded by the partition plate simultaneously, and the fourth oil port and the second oil port are ensured not to be shielded by the partition plate simultaneously.

Specifically, in order to facilitate the rotation of the second revolving body relative to the first revolving body, the first revolving body may be cylindrical, the second revolving body may be ring-shaped, and the first oil port, the second oil port, the third oil port, the fourth oil port, the first annular groove, the second annular groove, the first oil passage and the second oil passage are located at the same height in order to ensure the communication effect of the oil passage.

In any of the above technical solutions, further, the method further includes: the material conveying hole is formed in the first rotary body; and/or a conductive slip ring, arranged on the first revolving body, the conductive slip ring can rotate relative to the first revolving body; the electric wire harness hole is formed in the first rotating body, and the electric wire harness can penetrate through the electric wire harness hole to be connected to the conductive slip ring; and/or mounting grooves which are arranged on the first revolving body or the second revolving body and are positioned at the top and the bottom of the first annular groove and the second annular groove; and the sealing element is arranged in the mounting groove.

In the technical scheme, the material conveying hole is formed, so that materials can be conveyed through the material conveying hole conveniently, and the materials can be water, concrete and the like which can be conveyed through the hole.

In the technical scheme, the electric power transmission device further comprises a conductive slip ring and an electric wiring harness hole, electric signals are conveniently transmitted through the conductive slip ring and the electric wiring harness hole, specifically, the conductive slip ring is coaxially arranged on the upper portion of the first revolving body and can rotate around the first revolving body, conductive wires are arranged in the axial direction of the inner periphery of the conductive slip ring, and each conductive wire and the corresponding conductive wiring harness keep electric contact in the relative rotation process of the conductive slip ring and the first revolving body.

In this technical scheme, further included mounting groove and sealing member, through the setting of mounting groove and sealing member, can seal first ring channel and second ring channel, avoided the loss of flow of hydraulic oil for center swivel joint uses more safely.

According to a second aspect of the present invention, there is provided a hydraulic control system characterized by comprising: the center swivel joint of any of the above technical solutions; a first valve port of the reversing device is communicated with a first oil port of the central rotary joint, and a second valve port of the reversing device is communicated with a second oil port; an oil inlet of the hydraulic driving part is communicated with a third valve port of the reversing device, and an oil outlet of the hydraulic driving part is communicated with a fourth valve port of the reversing device.

The hydraulic control system provided by the invention can respectively take two oil paths formed in the central rotary joint as an oil supply path and an oil return path, and the arrangement of the reversing device ensures that the oil supply path is always communicated with the oil inlet of the hydraulic driving piece and the oil return path is always communicated with the oil return port of the hydraulic driving piece in the rotation process of the second rotary body of the central rotary joint.

For example, when the first annular groove and the second annular groove are disposed on the second revolving body, the first oil passage of the central revolving joint is used as an oil inlet passage, the supplied high-pressure hydraulic oil passes through the central revolving joint and then enters the reversing device through one of the first oil port and the second oil port, and then enters the hydraulic driving member through the third oil port of the reversing device after passing through the reversing device.

For example, when the first annular groove and the second annular groove are disposed on the first rotary body, the second oil passage of the central rotary joint is used as an oil inlet passage, the supplied high-pressure hydraulic oil passes through the central rotary joint and then enters the reversing device through one of the first oil port and the second oil port, and then enters the hydraulic driving member through the third oil port of the reversing device after passing through the reversing device.

In particular, a hydraulic drive reversing valve may also be provided between the hydraulic drive and the reversing device for controlling the direction in which the hydraulic oil supply delivers hydraulic oil to the hydraulic drive.

In the hydraulic control system provided by the second aspect of the present invention, since the hydraulic control system includes the center swivel joint according to any one of the above technical solutions, the hydraulic control system has all the advantageous technical effects of the center swivel joint.

In addition, the hydraulic control system in the second aspect of the present invention may further have the following additional technical features:

in the above technical solution, further, the reversing device is a two-position four-way electromagnetic reversing valve; or the reversing device is a two-position four-way hydraulic control reversing valve; or the reversing device comprises: one end of the first oil supply path is communicated with the first valve port, the other end of the first oil supply path is communicated with the third valve port, a first one-way valve is arranged on the first oil supply path, and an inlet of the first one-way valve is communicated with the first valve port; one end of the second oil supply pipeline is communicated with the second valve port, the other end of the second oil supply pipeline is communicated with the third valve port, the second oil supply pipeline is provided with a second one-way valve, and an inlet of the second one-way valve is communicated with the second valve port; one end of the first oil return way is communicated with the first valve port, the other end of the first oil return way is communicated with the fourth valve port, a third check valve is arranged on the first oil return way, and an inlet of the third check valve is communicated with the fourth valve port; and one end of the second oil return path is communicated with the second valve port, the other end of the second oil return path is communicated with the fourth valve port, a fourth one-way valve is arranged on the second oil return path, and an inlet of the fourth one-way valve is communicated with the fourth valve port.

In the technical scheme, the specific type of the reversing device is further provided, and the reversing device can be a two-position four-way electromagnetic reversing valve, a two-position four-way hydraulic control reversing valve or a one-way valve bridge type structure.

Specifically, when the reversing device is a two-position four-way electromagnetic reversing valve or a two-position four-way hydraulic control reversing valve, the third valve port of the reversing device can be ensured to be the output valve port of the high-pressure hydraulic oil through reversing by the two-position four-way electromagnetic reversing valve or the two-position four-way hydraulic control reversing valve.

Specifically, when the reversing device is of a one-way valve bridge structure, the one-way valve bridge structure comprises a first oil supply path, a second oil supply path, a first oil return path and a second oil return path, wherein the first oil supply path is provided with a first one-way valve, the second oil supply path is provided with a second one-way valve, the first oil return path is provided with a third one-way valve, and the second oil return path is provided with a fourth one-way valve, so that high-pressure hydraulic oil supplied by one of the first oil path or the second oil path can only be supplied to a routing port of the hydraulic driving part through the first oil supply path or the second oil supply path through the central rotary joint, and low-pressure hydraulic oil returned by the hydraulic driving part can only be returned to the other one of the first oil return path and the second oil return path of the central rotary joint through the first oil return path or the second oil return path.

In any of the above technical solutions, further, when the first annular groove and the second annular groove are provided in the second revolving body, the first revolving body is further provided with a third oil passage and a fourth oil passage, the third oil passage is communicated with one of the first annular groove and the second annular groove, and the fourth oil passage is communicated with the other of the first annular groove and the second annular groove, the method further includes: the first execution valve port of the third reversing valve is communicated with the first oil duct, and the second execution valve port of the third reversing valve is communicated with the third oil duct; the first execution valve port of the fourth reversing valve is communicated with the second oil duct, and the second execution valve port of the fourth reversing valve is communicated with the fourth oil duct; the oil inlet valve port of the fourth reversing valve or the oil inlet valve port of the third reversing valve is communicated with an oil source; the first sensor is connected to the first oil duct and the third oil duct and used for acquiring first oil pressure information in the first oil duct and the third oil duct; the second sensor is connected to the second oil duct and the fourth oil duct and used for acquiring second oil pressure information in the second oil duct and the fourth oil duct; the first controller is connected to the first inductor and the second inductor and used for controlling the third reversing valve to reverse under the condition that the first oil pressure information is abnormal and controlling the fourth reversing valve to reverse under the condition that the second oil pressure information is abnormal. Or the first annular groove and the second annular groove are arranged on the first revolving body, the second revolving body is further provided with a third oil port and a fourth oil port, the third oil port is communicated with one of the first annular groove and the second annular groove, and the fourth oil port is communicated with the other one of the first annular groove and the second annular groove, and the oil pump further comprises: the first execution valve port of the first reversing valve is communicated with the first oil port, the second execution valve port of the first reversing valve is communicated with the second oil port, and the oil outlet valve port of the first reversing valve is communicated with the first valve port of the reversing device; the first execution valve port of the first reversing valve is communicated with the first oil port, the second execution valve port of the first reversing valve is communicated with the second oil port, the first execution valve port of the first reversing valve is communicated with the second oil port, and the oil outlet valve port of the first reversing valve is communicated with the first valve port of the reversing device; the third sensor is connected to the first oil port and the third oil port and used for acquiring third oil pressure information in the first oil port and the third oil port; the fourth sensor is connected to the second oil port and the fourth oil port and used for acquiring fourth oil pressure information in the second oil port and the fourth oil port; and the second controller is connected with the third inductor and the fourth inductor and used for controlling the fifth reversing valve to reverse under the condition that the third oil pressure information is abnormal and controlling the sixth reversing valve to reverse under the condition that the fourth oil pressure information is abnormal.

In the technical scheme, under the condition that the central rotary joint comprises the third oil duct and the fourth oil duct, the engineering vehicle comprises a third reversing valve, a fourth reversing valve, a first inductor, a second inductor and a first controller.

Specifically, the first sensor is used for acquiring first oil pressure information in the first oil duct and the third oil duct, when the first oil pressure information is abnormal, it can be considered that one of the first oil duct and the third oil duct in the current state is shielded by a partition plate between the first annular groove and the second annular groove, at this time, the third reversing valve can be controlled by the first controller to reverse, the working states of the first oil duct and the third oil duct are changed, the other one of the first oil duct and the third oil duct is communicated with the first annular groove and the second annular groove, and throttling loss is avoided.

Specifically, the second sensor is used for acquiring second oil pressure information in the second oil duct and the fourth oil duct, when the second oil pressure information is abnormal, it can be considered that one of the second oil duct and the fourth oil duct in the current state is blocked by the partition plate between the first annular groove and the second annular groove, at this time, the fourth reversing valve can be controlled to reverse through the first controller, the working states of the second oil duct and the fourth oil duct are changed, the other of the second oil duct and the fourth oil duct is communicated with the first annular groove and the second annular groove, and throttling loss is avoided.

In the technical scheme, under the condition that the central rotary joint comprises the third oil port and the fourth oil port, the engineering vehicle comprises a fifth reversing valve, a sixth reversing valve, a third inductor, a fourth inductor and a second controller.

Specifically, the third inductor is used for acquiring third oil pressure information in the first oil port and the third oil port, when the third oil pressure information is abnormal, it can be considered that one of the first oil port or the third oil port in the current state is shielded by the partition plate between the first annular groove and the second annular groove, at the moment, the fifth reversing valve can be controlled by the first controller to reverse, the working states of the first oil port and the third oil port are changed, the other of the first oil port or the third oil port is communicated with the first annular groove and the second annular groove, and throttling loss is avoided.

Specifically, the fourth inductor is used for acquiring fourth oil pressure information in the second oil port and the fourth oil port, when the fourth oil pressure information is abnormal, one of the second oil port and the fourth oil port in the current state can be considered to be blocked by the partition plate between the first annular groove and the second annular groove, the sixth reversing valve can be controlled to reverse through the second controller at the moment, the working states of the second oil port and the fourth oil port are changed, the other of the second oil port and the fourth oil port is communicated with the first annular groove and the second annular groove, and throttling loss is avoided.

According to a third aspect of the present invention, there is provided a hydraulic control system comprising: the center swivel joint of any of the above technical solutions; a first valve port of the reversing device is communicated with the first oil duct of the central swivel joint, and a second valve port of the reversing device is communicated with the second oil duct; and an oil inlet of the hydraulic driving part is communicated with a third valve port of the reversing device, and an oil outlet of the hydraulic driving part is communicated with a fourth valve port of the reversing device.

For example, when the first annular groove and the second annular groove are disposed on the second revolving body, the first oil port of the central revolving joint is used as an oil inlet channel, the supplied high-pressure hydraulic oil enters the reversing device through one of the first oil channel and the second oil channel after passing through the central revolving joint, and enters the hydraulic driving member through the third valve port of the reversing device after passing through the reversing device.

For example, when the first annular groove and the second annular groove are disposed on the first rotary body, the second oil port of the central rotary joint is used as an oil inlet channel, the supplied high-pressure hydraulic oil enters the reversing device through one of the first oil channel and the second oil channel after passing through the central rotary joint, and enters the hydraulic driving member through the third valve port of the reversing device after passing through the reversing device.

In addition, the work vehicle according to the third aspect of the present invention may further include the following additional features:

In any of the above technical solutions, further, when the first annular groove and the second annular groove are provided in the second revolving body, the first revolving body is further provided with a third oil passage and a fourth oil passage, the third oil passage is communicated with one of the first annular groove and the second annular groove, and the fourth oil passage is communicated with the other of the first annular groove and the second annular groove, the method further includes: the first execution valve port of the seventh reversing valve is communicated with the first oil duct, the second execution valve port of the seventh reversing valve is communicated with the third oil duct, and the oil outlet valve port of the seventh reversing valve is communicated with the first valve port of the reversing device; the first execution valve port of the eighth reversing valve is communicated with the second oil duct, the second execution valve port of the eighth reversing valve is communicated with the fourth oil duct, and the oil outlet valve port of the eighth reversing valve is communicated with the second valve port of the reversing device; the fifth sensor is connected to the first oil duct and the third oil duct and used for acquiring fifth oil pressure information in the first oil duct and the third oil duct; the sixth sensor is connected to the second oil duct and the fourth oil duct and used for acquiring sixth oil pressure information in the second oil duct and the fourth oil duct; and the third controller is connected with the fifth inductor and the sixth inductor and is used for controlling the seventh reversing valve to reverse under the condition that the fifth oil pressure information is abnormal and controlling the eighth reversing valve to reverse under the condition that the sixth oil pressure information is abnormal. Or first annular groove and second annular groove set up on first solid of revolution, still be provided with third hydraulic fluid port and fourth hydraulic fluid port on the second solid of revolution, the third hydraulic fluid port communicates in one of first annular groove and second annular groove, and the fourth hydraulic fluid port communicates under the condition of another in first annular groove and second annular groove, still includes: a first executing valve port of the ninth reversing valve is communicated with the first oil port, and a second executing valve port of the ninth reversing valve is communicated with the third oil port; a first executing valve port of the tenth reversing valve is communicated with the second oil port, and a second executing valve port of the tenth reversing valve is communicated with the fourth oil port; the seventh inductor is connected with the first oil port and the third oil port and used for acquiring seventh oil pressure information in the first oil port and the third oil port; the oil inlet valve port of the ninth reversing valve or the oil inlet valve port of the tenth reversing valve is communicated with an oil source; the eighth sensor is connected to the second oil port and the fourth oil port and used for acquiring eighth oil pressure information in the second oil port and the fourth oil port; and the fourth controller is connected with the third inductor and the fourth inductor and is used for controlling the ninth reversing valve to reverse under the condition that the seventh oil pressure information is abnormal and controlling the tenth reversing valve to reverse under the condition that the eighth oil pressure information is abnormal.

In the technical scheme, under the condition that the central rotary joint comprises the third oil duct and the fourth oil duct, the engineering vehicle comprises a seventh reversing valve, an eighth reversing valve, a fifth inductor, a sixth inductor and a third controller.

Specifically, the fifth sensor is configured to obtain fifth oil pressure information in the first oil passage and the third oil passage, and when the fifth oil pressure information is abnormal, it may be considered that one of the first oil passage and the third oil passage in the current state is blocked by the partition between the first annular groove and the second annular groove, and at this time, the seventh directional control valve may be controlled by the third controller to change the direction, so that the working state of the first oil passage and the third oil passage is changed, and the other of the first oil passage and the third oil passage is communicated with the first annular groove and the second annular groove, thereby avoiding throttling loss.

Specifically, the sixth sensor is configured to obtain sixth oil pressure information in the second oil passage and the fourth oil passage, and when the sixth oil pressure information is abnormal, it may be considered that one of the second oil passage and the fourth oil passage in the current state is blocked by the partition between the first annular groove and the second annular groove, and at this time, the eighth reversing valve may be controlled by the third controller to reverse, so as to change the working states of the second oil passage and the fourth oil passage, so that the other of the second oil passage and the fourth oil passage is communicated with the first annular groove and the second annular groove, thereby avoiding throttling loss.

In the technical scheme, under the condition that the central rotary joint comprises the third oil port and the fourth oil port, the engineering vehicle comprises a ninth reversing valve, a tenth reversing valve, a seventh inductor, an eighth inductor and a fourth controller.

Specifically, the seventh sensor is used for acquiring seventh oil pressure information in the first oil port and the third oil port, when the seventh oil pressure information is abnormal, it can be considered that one of the first oil port or the third oil port in the current state is blocked by the partition plate between the first annular groove and the second annular groove, the ninth reversing valve can be controlled to reverse through the fourth controller, the working states of the first oil port and the third oil port are changed, the other of the first oil port or the third oil port is communicated with the first annular groove and the second annular groove, and throttling loss is avoided.

Specifically, the eighth inductor is used for acquiring eighth oil pressure information in the second oil port and the fourth oil port, when the eighth oil pressure information is abnormal, it can be considered that one of the second oil port or the fourth oil port in the current state is blocked by the partition plate between the first annular groove and the second annular groove, the tenth reversing valve can be controlled by the fourth controller to reverse at the moment, the working states of the second oil port and the fourth oil port are changed, the other of the second oil port or the fourth oil port is communicated with the first annular groove and the second annular groove, and throttling loss is avoided.

According to a fourth aspect of the present invention, there is provided a work vehicle including: a hydraulic oil pump; the hydraulic control system of any of the embodiments described above; the hydraulic oil pump is communicated with the first oil duct or the second oil duct of the central rotary joint through an oil supply path; or the hydraulic oil pump is communicated with the oil inlet valve port of the fourth reversing valve or the oil inlet valve port of the third reversing valve through an oil supply way; or the hydraulic oil pump is communicated with the first oil port or the second oil port of the central rotary joint through the oil supply path; or the hydraulic oil pump is communicated with the oil inlet valve port of the ninth reversing valve or the oil inlet valve port of the tenth reversing valve through the oil supply path; and the executing piece is connected to the hydraulic driving piece.

The work vehicle according to the present invention includes the hydraulic control system described above, and therefore the work vehicle according to the present invention has all the advantageous technical effects of the hydraulic control system provided therein.

Specifically, the work vehicle may be another vehicle with a rotating member such as an excavator, a crane, and a pump truck.

In addition, the work vehicle according to the fourth aspect of the present invention may further include the following additional features:

in the above technical solution, further, the method further includes: the hydraulic oil pump is communicated with an oil inlet valve port of the first reversing valve, wherein a first execution valve port of the first reversing valve is communicated with the first oil duct, and a second execution valve port of the first reversing valve is communicated with the second oil duct; or the first execution valve port of the first reversing valve is communicated with the oil inlet valve port of the fourth reversing valve, and the second execution valve port of the first reversing valve is communicated with the oil inlet valve port of the third reversing valve; or the first execution valve port of the first reversing valve is communicated with the first oil port, and the second execution valve port of the first reversing valve is communicated with the second oil port; or the first execution valve port of the first reversing valve is communicated with the oil inlet valve port of the ninth reversing valve, and the second execution valve port of the first reversing valve is communicated with the oil inlet valve port of the tenth reversing valve; the rotary motor is communicated with the hydraulic oil pump through a driving oil path and is used for driving the first rotary body and the second rotary body to rotate relatively; and the hydraulic oil pump is communicated with an oil inlet valve port of the second reversing valve, a first execution valve port of the second reversing valve is communicated with a first execution valve port of the rotary motor, and a second execution valve port of the rotary motor is communicated with a second execution valve port of the second reversing valve.

In the technical scheme, the device further comprises a first reversing valve, a rotary motor and a second reversing valve. Through the arrangement of the first reversing valve, hydraulic oil output by the hydraulic oil pump can be supplied to one of the first oil passage and the second oil passage in the central rotary joint through the first reversing valve, and low-pressure hydraulic oil returned through the other of the first oil passage and the second oil passage can be returned to the oil tank through the first reversing valve; through the arrangement of the rotary motor and the second reversing valve, the first execution valve port which can supply high-pressure hydraulic oil to the rotary motor through the hydraulic oil pump can drive the rotary motor to rotate, and the second execution valve port of the rotary motor can return to the oil tank through the second execution valve port of the second reversing valve. The rotary motor can drive the second rotary body of the center rotary joint to rotate relative to the first rotary body, and a power source is provided for the center rotary joint.

In particular, in the case where the center swivel joint includes the third oil passage and the fourth oil passage, the third directional valve of the hydraulic control system is disposed between the first directional valve and the center swivel joint. The oil inlet valve port of the third reversing valve is communicated with the first execution valve port of the first reversing valve, the first execution valve port of the third reversing valve is communicated with the first oil duct, and the second execution valve port of the third reversing valve is communicated with the third oil duct. And the fourth reversing valve of the hydraulic control system is arranged between the first reversing valve and the central rotary joint, the oil inlet valve port of the fourth reversing valve is communicated with the second execution valve port of the first reversing valve, the first execution valve port of the fourth reversing valve is communicated with the second oil duct, and the second execution valve port of the fourth reversing valve is communicated with the fourth oil duct.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1a shows a schematic structural diagram of a central swivel joint provided in accordance with one embodiment of the present invention;

FIG. 1b is a cross-sectional view taken along the direction AA in FIG. 1 a;

FIG. 2a shows a structural schematic view of a central swivel joint provided according to another embodiment of the present invention;

FIG. 2b is a cross-sectional view taken along the direction BB in FIG. 2 a;

FIG. 3a shows a schematic structural view of a central swivel joint provided according to yet another embodiment of the present invention;

FIG. 3b is a cross-sectional view taken along the direction CC in FIG. 3 a;

FIG. 4a shows a schematic structural view of a central swivel joint provided in accordance with yet another embodiment of the present invention;

FIG. 4b is a cross-sectional view taken along direction DD in FIG. 4 a;

FIG. 5 is a schematic diagram illustrating a hydraulic control system provided in accordance with an embodiment of a third aspect of the present invention;

FIG. 6 is a schematic diagram illustrating a hydraulic control system according to another embodiment of a third aspect of the present invention;

FIG. 7 is a schematic diagram illustrating a hydraulic control system provided in accordance with yet another embodiment of the third aspect of the present invention;

FIG. 8 is a schematic diagram illustrating a hydraulic control system provided in accordance with still another embodiment of the third aspect of the present invention;

FIG. 9 is a schematic diagram illustrating a hydraulic control system provided in accordance with an embodiment of a fourth aspect of the present invention;

fig. 10 is a schematic structural diagram illustrating a hydraulic control system according to another embodiment of the fourth aspect of the present invention;

FIG. 11 is a schematic diagram illustrating a hydraulic control system according to yet another embodiment of the fourth aspect of the present invention;

fig. 12 is a schematic structural diagram illustrating a hydraulic control system according to a further embodiment of the fourth aspect of the present invention;

fig. 13 shows a schematic configuration diagram of a work vehicle provided according to an embodiment of the present invention;

fig. 14 shows a schematic configuration diagram of a work vehicle provided according to still another embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the part names in fig. 1a to 14 is:

100 center swivel joint, 2 first swivel body, 4 second swivel body, 6 first ring groove, 8 second ring groove, 10 feed delivery hole, 12 conductive slip ring, 14 electrical wiring harness hole, 16 mounting groove, 18 sealing element;

201 a first oil gallery, 202 a second oil gallery, 204 a third oil gallery, 206 a fourth oil gallery, 402 a first oil port, 404 a second oil port, 406 a third oil port, 408 a fourth oil port;

200 hydraulic control system, 22 reversing device, 44 hydraulic drive, 46 hydraulic drive reversing valve;

222 a two-position four-way solenoid directional valve, 224 a two-position four-way pilot operated directional valve, 226 a first port, 228 a second port, 230 a third port, 232 a fourth port, 234 a first check valve, 236 a second check valve, 238 a third check valve, 240 a fourth check valve, 242 a sensing device, 244 a control device;

the hydraulic control system comprises a 300 work vehicle, a 24 hydraulic oil pump, a 26 actuator, a 28 first directional control valve, a 30 rotary motor, a 32 second directional control valve, a 34 third directional control valve, a 36 fourth directional control valve, a 38 first sensor, a 40 second sensor, a 42 first controller, a 48 seventh sensor, a 50 eighth sensor, a 52 fourth controller, a 54 ninth directional control valve and a 56 tenth directional control valve.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

A center swivel joint 100, a hydraulic control system 200, and a work vehicle 300 according to some embodiments of the present invention are described below with reference to fig. 1 a-14.

In a first aspect embodiment of the present invention, as shown in fig. 1a and 1b, the present invention provides a central swivel joint 100 comprising: a first revolving body 2, a second revolving body 4, a first annular groove 6 and a second annular groove 8.

Wherein, a first oil passage 201 and a second oil passage 202 are provided in the first revolving body 2; the second revolving body 4 is sleeved outside the first revolving body 2, the second revolving body 4 and the first revolving body 2 can rotate relatively, and the second revolving body 4 is provided with a first oil port 402 and a second oil port 404; the first annular groove 6 is arranged on the second revolving body 4 and is positioned at the connecting side of the first revolving body 2 and the second revolving body 4, and the first oil port 402 is communicated with the first annular groove 6; the second annular groove 8 is provided in the second revolving body 4 on the connecting side of the first revolving body 2 and the second revolving body 4, and the second oil port 404 is communicated with the second annular groove 8. Wherein the first oil passage 201 communicates with one of the first and second

annular grooves

6, 8, and the second oil passage 202 communicates with the other of the first and second

annular grooves

6, 8.

In this embodiment, in the central rotary joint 100 provided by the present invention, the first oil port 402 of the second rotary body 4 is communicated with the first annular groove 6, and the second oil port 404 of the second rotary body 4 is communicated with the second annular groove 8. The second revolving body 4 can rotate relative to the first revolving body 2 to drive the first annular groove 6 and the second annular groove 8 to rotate relative to the first oil duct 201 and the second oil duct 202 of the first revolving body 2, the first oil duct 201 is communicated with one of the first annular groove 6 and the second annular groove 8, and the second oil duct 202 is communicated with the other of the first annular groove 6 and the second annular groove 8, so that the first oil duct 201 on the first revolving body 2 can be communicated with one of the first oil port 402 and the second oil port 404, and the second oil duct 202 can be communicated with the other of the first oil port 402 and the second oil port 404. The two oil passages formed by one central rotary joint 100 are realized, the external dimension of the central rotary joint 100 can be reduced, particularly, the axial length of the central rotary joint 100 is shortened, and the weight and the cost of the central rotary joint 100 are reduced.

In this embodiment, in the center swivel joint 100 provided by the present invention, during use, hydraulic oil may be introduced through the first oil channel 201 and the second oil channel 202, and the hydraulic oil in the first oil channel 201 is supplied to one of the first annular groove 6 and the second annular groove 8, and is communicated with one of the first oil port 402 and the second oil port 404 through the first annular groove 6 or the second annular groove 8. The hydraulic oil of the second oil passage 202 is supplied to the other one of the first annular groove 6 and the second annular groove 8, and is communicated with the other one of the first oil port 402 and the second oil port 404 through the inside of the first annular groove 6 or the second annular groove 8, so that the output of the double oil passages can be realized through one center swivel joint 100, the overall dimension of the center swivel joint 100 can be reduced, particularly, the axial length of the center swivel joint 100 is shortened, and the weight and the cost of the center swivel joint 100 are reduced.

In this embodiment, the center swivel joint 100 provided by the present invention may further input hydraulic oil in a high pressure state through one of the first oil passage 201 and the second oil passage 202 and return the hydraulic oil through the other of the first oil passage 201 and the second oil passage 202 during use. For example, the first oil passage 201 is used for supplying hydraulic oil, the first oil passage 201 is communicated with one of the first annular groove 6 and the second annular groove 8, the hydraulic oil is supplied to the hydraulic driving member through the first annular groove 6 or the second annular groove 8 and communicated with one of the first oil port 402 and the second oil port 404, and the hydraulic oil in a low-pressure state enters the central swivel joint 100 through the other of the first oil port 402 and the second oil port 404, is communicated with the first annular groove 6 or the second annular groove 8, and is discharged through the second oil passage 202. The arrangement of the center swivel joint 100 can realize the supply and return of the hydraulic oil, and the outer dimension of the center swivel joint 100 can be reduced, especially the axial length of the center swivel joint 100 is shortened, and the weight and the cost of the center swivel joint 100 are reduced.

In one embodiment of the present invention, as shown in fig. 1a and 1b, the first annular groove 6 and the second annular groove 8 are plural, and the plural first annular grooves 6 and the plural second annular grooves 8 are provided at intervals in the height direction of the second rotor 4. Each first annular groove 6 is communicated with one first oil port 402, and each second annular groove 8 is communicated with one second oil port 404; the first oil channel 201 and the second oil channel 202 are multiple, the multiple first oil channels 201 and the multiple second oil channels 202 are divided into multiple groups, and the first annular groove 6 and the second annular groove 8 at the same height are matched with the first oil channel 201 and the second oil channel 202 in one group.

In this embodiment, further, the first annular groove 6 and the second annular groove 8 are plural, and the plural first annular grooves 6 and the plural second annular grooves 8 are provided at intervals in the height direction of the second rotation body 4, so that the central rotation joint 100 has a multilayer structure, and a double oil passage can be provided for each layer. The overall dimension of the center swivel joint 100 is further reduced, the weight and the cost of the center swivel joint 100 are reduced, the installation and the layout of the center swivel joint 100 are convenient, and the center swivel joint is particularly suitable for narrow installation spaces among rotating parts of engineering vehicle frames.

In an embodiment of the present invention, as shown in fig. 4a and 4b, further, the method further includes: a third oil passage 204 provided in the first rotating body 2, the third oil passage 204 communicating with one of the first annular groove 6 and the second annular groove 8; and a fourth oil passage 206 provided in the first rotary body 2, the fourth oil passage 206 communicating with the other of the first annular groove 6 and the second annular groove 8. The cross section of the first rotating body 2 is circular, the first oil passage 201 and the second oil passage 202 are arranged in a central symmetrical manner around the center of the circle of the cross section of the first rotating body 2, and the third oil passage 204 and the fourth oil passage 206 are arranged in a central symmetrical manner around the center of the circle of the cross section of the first rotating body 2.

In this embodiment, the third oil passage 204 and the fourth oil passage 206 are further included, while providing a layout pattern of the first oil passage 201, the second oil passage 202, the third oil passage 204, and the fourth oil passage 206. In order to avoid that the hydraulic oil breaks through the first annular groove 6 and the second annular groove 8, it is ensured that the first annular groove 6 and the second annular groove 8 are not communicated, and a partition plate is formed between the first annular groove 6 and the second annular groove 8. Considering that the first oil passage 201 or the second oil passage 202 may be blocked by a partition plate in the process of rotating relative to the first rotating body 2, which may cause throttling loss of hydraulic oil, through the arrangement of the third oil passage 204 and the fourth oil passage 206, the third oil passage 204 and the first oil passage 201 are not blocked by the partition plate at the same time, and the fourth oil passage 206 and the second oil passage 202 are not blocked by the partition plate at the same time, when the first oil passage 201 is blocked by the partition plate, the third oil passage 204 may be used to replace the first oil passage 201, and when the second oil passage 202 is blocked by the partition plate, the fourth oil passage 206 may be used to avoid throttling loss of hydraulic oil in the center rotating joint 100.

In this embodiment, the first oil passage 201 is ensured to communicate with one of the first and second

annular grooves

6 and 8 by the first and

second oil passages

201 and 202 being arranged in central symmetry with the center of the cross section of the first rotary body 2 and the third and

fourth oil passages

204 and 206 being arranged in central symmetry with the center of the cross section of the first rotary body 2. The second oil passage 202 is communicated with the other of the first annular groove 6 and the second annular groove 8, ensuring that the third oil passage 204 is communicated with one of the first annular groove 6 and the second annular groove 8, and the fourth oil passage 206 is communicated with the other of the first annular groove 6 and the second annular groove 8, ensuring the formation of the double oil passages of the central swivel joint 100.

Specifically, the distance between the third oil passage 204 and the first oil passage 201 is greater than the width of the partition, and the distance between the fourth oil passage 206 and the second oil passage 202 is greater than the width of the partition, so that the third oil passage 204 and the first oil passage 201 are not simultaneously blocked by the partition, and the fourth oil passage 206 and the second oil passage 202 are not simultaneously blocked by the partition.

Specifically, in order to facilitate the second revolving body 4 to rotate relative to the first revolving body 2, the first revolving body 2 may be cylindrical, the second revolving body 4 may be ring-shaped, and the first oil port 402, the second oil port 404, the first annular groove 6, the second annular groove 8, the first oil passage 201, the second oil passage 202, the third oil passage 204, and the fourth oil passage 206 are at the same height in order to ensure the communication effect of the oil passages.

In an embodiment of the present invention, as shown in fig. 4a and 4b, further, the method further includes: a material conveying hole 10 provided in the first rotary body 2; and/or a conductive slip ring 12, which is arranged on the first revolving body 2, wherein the conductive slip ring 12 can rotate relative to the first revolving body 2; an electrical harness hole 14 formed in the first rotating body 2, through which an electrical harness can pass to connect to the conductive slip ring 12; and/or mounting grooves 16 which are formed on the second revolving body 4 and are positioned at the top and the bottom of the first annular groove 6 and the second annular groove 8; and a sealing member 18 disposed in the mounting groove 16.

In this embodiment, it is further included that the material conveying hole 10 is opened to facilitate the material conveying through the material conveying hole 10, and the material may be water or concrete or other materials capable of being conveyed through the hole.

In this embodiment, a conductive slip ring 12 and an electrical harness hole 14 are further included, the transmission of electrical signals is facilitated by the arrangement of the conductive slip ring 12 and the electrical harness hole 14, specifically, the conductive slip ring 12 is coaxially arranged on the upper portion of the first rotating body 2 and can rotate around the first rotating body 2, and conductive wires are arranged in the axial direction of the inner periphery of the conductive slip ring 12, and each conductive wire is in electrical contact with a corresponding conductive harness during the relative rotation of the conductive slip ring 12 and the first rotating body 2.

In this embodiment, a mounting groove 16 and a sealing element 18 are further included, and the first annular groove 6 and the second annular groove 8 can be sealed by the mounting groove 16 and the sealing element 18, so that the loss of hydraulic oil is avoided, and the central swivel joint 100 is safer to use.

In a second aspect embodiment of the present invention, as shown in fig. 2a and 2b, there is provided a center swivel joint 100 according to the present invention, comprising: a first rotor 2, a second rotor 4, a first annular groove 6 and a second annular groove 8.

Wherein, a first oil passage 201 and a second oil passage 202 are provided in the first revolving body 2; the second revolving body 4 is sleeved outside the first revolving body 2, the second revolving body 4 and the first revolving body 2 can rotate relatively, and the second revolving body 4 is provided with a first oil port 402 and a second oil port 404; the first annular groove 6 is arranged on the first revolving body 2 and is positioned at the connecting side of the first revolving body 2 and the second revolving body 4, and the first oil duct 201 is communicated with the first annular groove 6; the second annular groove 8 is provided in the first revolving body 2 on the connecting side of the first revolving body 2 and the second revolving body 4, and the second oil passage 202 communicates with the second annular groove 8. The first oil port 402 is communicated with one of the first annular groove 6 and the second annular groove 8, and the second oil port 404 is communicated with the other one of the first annular groove 6 and the second annular groove 8.

In this embodiment, in the central swivel joint 100 provided by the present invention, the first oil channel 201 on the first swivel body 2 is communicated with the first annular groove 6, the second oil channel 202 on the first swivel body 2 is communicated with the second annular groove 8, the second swivel body 4 can rotate relative to the first swivel body 2, and drive the first oil port 402 and the second oil port 404 to rotate relative to the first swivel body 2, the first oil port 402 is communicated with one of the first annular groove 6 and the second annular groove 8, and the second oil port 404 is communicated with the other of the first annular groove 6 and the second annular groove 8. The first oil passage 201 on the first revolving body 2 can be communicated with one of the first oil port 402 and the second oil port 404, and the second oil passage 202 can be communicated with the other of the first oil port 402 and the second oil port 404, so that two oil passages can be formed by one center revolving joint 100, the overall size of the center revolving joint 100 can be reduced, particularly the axial length of the center revolving joint 100 is shortened, and the weight and the cost of the center revolving joint 100 are reduced.

In this embodiment, in the center swivel joint 100 provided by the present invention, during use, hydraulic oil can be introduced through the first oil passage 201 and the second oil passage 202, the hydraulic oil in the first oil passage 201 is supplied to the first annular groove 6, the first annular groove 6 can be communicated with one of the first oil port 402 and the second oil port 404 to output the hydraulic oil through the rotation of the second swivel body 4 relative to the first swivel body 2, the hydraulic oil in the second oil passage 202 is supplied to the second annular groove 8, the second annular groove 8 can be communicated with the other of the first oil port 402 and the second oil port 404 to output the hydraulic oil through the rotation of the second swivel body 4 relative to the first swivel body 2, and thus, the output of the double oil passages can be realized through one center swivel joint 100, the external dimension of the center swivel joint 100 can be reduced, and particularly the axial length of the center swivel joint 100 can be shortened, the weight and cost of the central swivel joint 100 is reduced.

In this embodiment, in the center swivel joint 100 provided by the present invention, during use, hydraulic oil may be input through one of the first oil passage 201 and the second oil passage 202, and the hydraulic oil is returned through the other one of the first oil passage 201 and the second oil passage 202, for example, the hydraulic oil is supplied through the first oil passage 201, the first oil passage 201 is communicated with one of the first oil port 402 or the second oil port 404 through the first annular groove 6, and the first oil port 402 or the second oil port 404 communicated with the first oil passage 201 may provide high-pressure hydraulic oil for the hydraulic driving member. Further, the low-pressure hydraulic oil after passing through the hydraulic driving member can be supplied to the first oil port 402 or one of the second oil and the second annular groove 8, so that the low-pressure hydraulic oil is discharged through the second oil passage 202, and the supply and return of the hydraulic oil can be realized through the arrangement of one center swivel joint 100, thereby reducing the overall dimension of the center swivel joint 100, particularly shortening the axial length of the center swivel joint 100, and reducing the weight and cost of the center swivel joint 100.

In one embodiment of the present invention, as shown in fig. 2a and 2b, further, the first annular groove 6 and the second annular groove 8 are plural, and the plural first annular grooves 6 and the plural second annular grooves 8 are provided at intervals in the height direction of the second rotator 4. Wherein each first annular groove 6 is communicated with one first oil channel 201, and each second annular groove 8 is communicated with one second oil channel 202; the first oil ports 402 and the second oil ports 404 are multiple, the multiple first oil ports 402 and the multiple second oil ports 404 are divided into multiple groups, and the first annular groove 6 and the second annular groove 8 at the same height are matched with the first oil ports 402 and the second oil ports 404 in one group.

In this embodiment, the first annular grooves 6 and the second annular grooves 8 are further plural, and the plural first annular grooves 6 and the plural second annular grooves 8 are arranged at intervals along the height direction of the first revolving body 2, so that the central revolving joint 100 is of a multilayer structure, and each layer can provide double oil ducts, thereby further reducing the external dimension of the central revolving joint 100, reducing the weight and the cost of the central revolving joint 100, facilitating the installation and layout of the central revolving joint 100, and being particularly suitable for narrow installation spaces between revolving parts of a construction vehicle frame.

In an embodiment of the present invention, further, the method further includes: the third oil port is arranged in the second revolving body 4 and is communicated with one of the first annular groove 6 and the second annular groove 8; the fourth oil port is arranged in the second revolving body 4 and communicated with the other one of the first annular groove 6 and the second annular groove 8; the cross section of the second rotary body 4 is circular, the first oil port 402 and the second oil port 404 are distributed in a central symmetry manner around the center of circle of the cross section of the second rotary body 4, and the third oil port and the fourth oil port are distributed in a central symmetry manner around the center of circle of the cross section of the second rotary body 4.

In this embodiment, a third oil port and a fourth oil port are further included, and a layout manner of the first oil port 402, the second oil port 404, the third oil port and the fourth oil port is provided. In order to avoid the hydraulic oil from breaking through the first annular groove 6 and the second annular groove 8, it is ensured that the first annular groove 6 and the second annular groove 8 are not communicated, and a partition plate is formed between the first annular groove 6 and the second annular groove 8, considering that there may be a case where the first oil port 402 or the second oil port 404 is blocked by the partition plate during the rotation relative to the first rotation body 2. Like this may lead to hydraulic oil to produce the throttling loss, third hydraulic fluid port and first hydraulic fluid port 402 can not sheltered from by the baffle simultaneously, when first hydraulic fluid port 402 is sheltered from by the baffle, can open the third hydraulic fluid port and replace first hydraulic fluid port 402, fourth hydraulic fluid port and second hydraulic fluid port 404 can not sheltered from by the baffle simultaneously, when second hydraulic fluid port 404 is sheltered from by the baffle, can launch the fourth hydraulic fluid port, avoid the hydraulic oil in the center swivel joint 100 to produce the throttling loss.

In this embodiment, the first oil port 402 and the second oil port 404 are distributed in a central symmetrical manner around the center of the cross section of the second rotating body 4, and the third oil port and the fourth oil port are distributed in a central symmetrical manner around the center of the cross section of the second rotating body 4, so that the first oil port 402 is ensured to be communicated with one of the first annular groove 6 and the second annular groove 8, the second oil port 404 is communicated with the other of the first annular groove 6 and the second annular groove 8, so that the third oil port is ensured to be communicated with one of the first annular groove 6 and the second annular groove 8, and the fourth oil port is communicated with the other of the first annular groove 6 and the second annular groove 8, so that the double oil passages of the central swivel 100 are ensured to be formed.

Specifically, the distance between the third oil port and the first oil port 402 is greater than the width of the partition plate, and the distance between the fourth oil port and the second oil port 404 is greater than the width of the partition plate, so that the third oil port and the first oil port 402 are not shielded by the partition plate at the same time, and the fourth oil port and the second oil port 404 are not shielded by the partition plate at the same time.

Specifically, in order to facilitate the second revolving body 4 to rotate relative to the first revolving body 2, the first revolving body 2 may be cylindrical, the second revolving body 4 may be ring-shaped, and the first oil port 402, the second oil port 404, the third oil port, the fourth oil port, the first annular groove 6, the second annular groove 8, the first oil duct 201, and the second oil duct 202 are located at the same height in order to ensure the communication effect of the oil path.

In a third aspect embodiment of the present invention, as shown in fig. 5 to 8, the present invention provides a hydraulic control system 200 including: the center swivel joint 100 provided in any of the embodiments of the first aspect described above, or the center swivel joint 100, the reversing device 22 and the hydraulic driver 44 provided in any of the embodiments of the second aspect described above.

The first valve port 226 of the reversing device 22 is communicated with the first oil port 402 of the central rotary joint 100, and the second valve port 228 of the reversing device 22 is communicated with the second oil port 404; the hydraulic drive 44 has an oil inlet connected to the third port 230 of the reversing device 22, and an oil outlet connected to the fourth port 232 of the reversing device 22.

In this embodiment, since the hydraulic control system 200 according to the present invention includes the center swivel joint 100 according to any one of the embodiments of the first aspect or the center swivel joint 100 according to any one of the embodiments of the second aspect, the hydraulic control system 200 according to the third aspect has all the advantageous effects of the center swivel joint 100.

In this embodiment, the hydraulic control system 200 provided by the present invention can use two oil paths formed in the central swivel joint 100 as an oil supply path and an oil return path, and the arrangement of the reversing device 22 ensures that the oil supply path is always communicated with the oil inlet of the hydraulic driving element 44 and the oil return path is always communicated with the oil return port of the hydraulic driving element 44 during the rotation process of the second swivel body 4 of the central swivel joint 100.

For example, in the case where the first annular groove 6 and the second annular groove 8 are provided in the second rotation body 4, the first oil passage 201 of the center rotation joint 100 is used as an oil inlet passage, and the supplied hydraulic oil in a high-pressure state passes through the center rotation joint 100, enters the direction changer 22 through one of the first oil port 402 and the second oil port 404, passes through the direction changer 22, and enters the hydraulic driver 44 through the third oil port 230 of the direction changer 22. When the second rotation body 4 of the center rotation joint 100 rotates, the communication state of the first oil passage 201 and the first oil port 402 or the second oil port 404 changes, and the first oil passage 201 is communicated with the other of the first oil port 402 or the second oil port 404, the reversing device 22 reverses to ensure that the third valve port 230 of the reversing device 22 is an output valve port of the high-pressure hydraulic oil.

For example, in the case where the first annular groove 6 and the second annular groove 8 are provided in the first rotation body 2, the second oil passage 202 of the center rotation joint 100 serves as an oil inlet passage, and the supplied hydraulic oil in a high-pressure state passes through the center rotation joint 100, enters the direction changer 22 through one of the first oil port 402 and the second oil port 404, passes through the direction changer 22, and enters the hydraulic driver 44 through the third oil port 230 of the direction changer 22. When the second rotation body 4 of the center rotation joint 100 rotates, the communication state between the second oil passage 202 and the first oil port 402 or the second oil port 404 changes, and the second oil passage 202 is communicated with the other of the first oil port 402 or the second oil port 404, the reversing device 22 reverses to ensure that the third valve port 230 of the reversing device 22 is an output valve port of the high-pressure hydraulic oil.

Specifically, a hydraulic drive reversing valve 46 may also be provided between the hydraulic drive 44 and the reversing device to control the direction of the hydraulic oil supply to the hydraulic drive 44.

In an embodiment of the present invention, further, as shown in fig. 6, the reversing device 22 is a two-position four-way electromagnetic reversing valve 222; or as shown in fig. 7, the reversing device 22 is a two-position four-way hydraulic control reversing valve 224; or as shown in fig. 8, the reversing device 22 includes: a first oil supply path, one end of which is communicated with the first port 226 and the other end is communicated with the third port 230, and the first oil supply path is provided with a first one-way valve 234 which only supplies oil to flow to the third port 230 through the first port 226; and a second oil supply path having one end connected to the second port 228 and the other end connected to the third port 230, and provided with a second check valve 236 for allowing only hydraulic oil to flow to the third port 230 through the second port 228. A first oil return path, one end of which is connected to the first port 226 and the other end is connected to the fourth port 232, and the first oil return path is provided with a third check valve 238 for allowing hydraulic oil to flow to the first port 226 through the fourth port 232; and a second oil return path, one end of which is communicated with the second valve port 228 and the other end of which is communicated with the fourth valve port 232, and the second oil return path is provided with a fourth check valve 240 for allowing only hydraulic oil to flow to the second valve port 228 through the fourth valve port 232.

In this embodiment, further providing a specific type of the reversing device 22, the reversing device 22 may be a two-position four-way solenoid reversing valve 222, a two-position four-way pilot operated reversing valve 224, or a check valve bridge configuration.

Specifically, when the reversing device 22 is the two-position four-way electromagnetic reversing valve 222 or the two-position four-way hydraulic control reversing valve 224, the third valve port 230 of the reversing device 22 can be ensured to be the output valve port of the high-pressure hydraulic oil by reversing through the two-position four-way electromagnetic reversing valve 222 or the two-position four-way hydraulic control reversing valve 224.

Specifically, when the reversing device 22 is a one-way valve bridge structure, the one-way valve bridge structure includes a first oil supply path, a second oil supply path, a first oil return path, and a second oil return path, the first oil supply path is provided with a first one-way valve 234, the second oil supply path is provided with a second one-way valve 236, the first oil return path is provided with a third one-way valve 238, and the second oil return path is provided with a fourth one-way valve 240, so that the high-pressure hydraulic oil supplied through one of the first oil path 201 or the second oil path 202 can only be supplied to the routing port of the hydraulic driving member 44 through the first oil supply path or the second oil supply path via the central return joint 100. The low-pressure hydraulic oil returned via the hydraulic driver 44 can be returned to only the other of the first oil return passage and the second oil return passage of the center swivel joint 100 through the first oil return passage or the second oil return passage.

In an embodiment of the present invention, as shown in fig. 13, further, the method further includes: in the case where the first annular groove 6 and the second annular groove 8 are provided in the second rotation body 4, and the first rotation body 2 is further provided with a third oil passage 204 and a fourth oil passage 206, the third oil passage 204 communicates with one of the first annular groove 6 and the second annular groove 8, and the fourth oil passage 206 communicates with the other of the first annular groove 6 and the second annular groove 8. Further comprising: and the third reversing valve 34 is arranged between the first reversing valve 28 and the central rotary joint 100, an oil inlet valve port of the third reversing valve 34 is communicated with a first execution valve port of the first reversing valve 28, a first execution valve port of the third reversing valve 34 is communicated with the first oil channel 201, and a second execution valve port of the third reversing valve 34 is communicated with the third oil channel 204. And the fourth direction valve 36 is arranged between the first direction valve 28 and the central rotary joint 100, an oil inlet valve port of the fourth direction valve 36 is communicated with a second execution valve port of the first direction valve 28, a first execution valve port of the fourth direction valve 36 is communicated with the second oil channel 202, and a second execution valve port of the fourth direction valve 36 is communicated with the fourth oil channel 206. The first sensor 38 is connected to the first oil channel 201 and the third oil channel 204 and used for acquiring first oil pressure information in the first oil channel 201 and the third oil channel 204; the second sensor 40 is connected to the second oil passage 202 and the fourth oil passage 206, and is used for acquiring second oil pressure information in the second oil passage 202 and the fourth oil passage 206; and a first controller 42 connected to the first sensor 38 and the second sensor 40, wherein the first controller 42 is configured to control the third direction changing valve 34 to change direction in case of abnormality of the first oil pressure information, and to control the fourth direction changing valve 36 to change direction in case of abnormality of the second oil pressure information.

In this embodiment, where the center swivel joint 100 includes the third oil gallery 204 and the fourth oil gallery 206, the work vehicle 300 includes the third directional valve 34, the fourth directional valve 36, the first sensor 38, the second sensor 40, and the first controller 42.

Specifically, the first sensor 38 is configured to obtain first oil pressure information in the first oil passage 201 and the third oil passage 204, and when the first oil pressure information is abnormal, it may be considered that one of the first oil passage 201 or the third oil passage 204 in the current state is blocked by a partition between the first annular groove 6 and the second annular groove 8, and at this time, the first controller 42 may control the third reversing valve 34 to reverse, so as to change the working state of the first oil passage 201 and the third oil passage 204, so that the other of the first oil passage 201 or the third oil passage 204 is communicated with the first annular groove 6 and the second annular groove 8, thereby avoiding throttling loss.

Specifically, the second sensor 40 is configured to obtain second oil pressure information in the second oil passage 202 and the fourth oil passage 206, and when the second oil pressure information is abnormal, it may be considered that one of the second oil passage 202 or the fourth oil passage 206 in the current state is blocked by the partition between the first annular groove 6 and the second annular groove 8, and at this time, the first controller 42 may control the fourth reversing valve 36 to reverse, and change the working state of the second oil passage 202 and the fourth oil passage 206, so that the other of the second oil passage 202 or the fourth oil passage 206 is communicated with the first annular groove 6 and the second annular groove 8, thereby avoiding throttling loss.

In an embodiment of the present invention, further, a fifth direction valve is disposed between the central swivel joint 100 and the direction device 22, a first implement port of the fifth direction valve is connected to the first oil port 402, a second implement port of the fifth direction valve is connected to the third oil port, and an oil outlet port of the fifth direction valve is connected to the first port 226 of the direction device 22. And a sixth direction valve disposed between the central rotary joint 100 and the direction device 22, wherein a first execution port of the sixth direction valve is communicated with the second oil port 404, a second execution port of the sixth direction valve is communicated with the fourth oil port, and an oil outlet port of the fourth direction valve 36 is communicated with the second port 228 of the direction device 22. The third sensor is connected to the first oil port 402 and the third oil port, and is used for acquiring third oil pressure information in the first oil port 402 and the third oil port; the fourth sensor is connected to the second oil port 404 and the fourth oil port, and is used for acquiring fourth oil pressure information in the second oil port 404 and the fourth oil port; and the second controller is connected with the third inductor and the fourth inductor and used for controlling the fifth reversing valve to reverse under the condition that the third oil pressure information is abnormal and controlling the sixth reversing valve to reverse under the condition that the fourth oil pressure information is abnormal.

In this embodiment, where the center swivel joint 100 includes a third port and a fourth port, the work vehicle 300 includes a fifth directional valve, a sixth directional valve, a third sensor, a fourth sensor, and a second controller.

Specifically, the third sensor is used for acquiring third oil pressure information in the first oil port 402 and the third oil port, when the third oil pressure information is abnormal, it can be considered that one of the first oil port 402 or the third oil port in the current state is blocked by the partition plate between the first annular groove 6 and the second annular groove 8, at this time, the fifth reversing valve can be controlled to reverse through the first controller 42, the working states of the first oil port 402 and the third oil port are changed, so that the other of the first oil port 402 or the third oil port is communicated with the first annular groove 6 and the second annular groove 8, and throttling loss is avoided.

Specifically, the fourth sensor is used for acquiring fourth oil pressure information in the second oil port 404 and the fourth oil port, when the fourth oil pressure information is abnormal, it can be considered that one of the second oil port 404 or the fourth oil port in the current state is blocked by the partition plate between the first annular groove 6 and the second annular groove 8, at this time, the sixth reversing valve can be controlled to reverse through the second controller, the working states of the second oil port 404 and the fourth oil port are changed, so that the other of the second oil port 404 or the fourth oil port is communicated with the first annular groove 6 and the second annular groove 8, and throttling loss is avoided.

In a fourth aspect embodiment of the present invention, as shown in fig. 9 to 12, a hydraulic control system includes: the central swivel joint 100 provided in any of the embodiments of the first aspect described above, or the central swivel joint 100, the reversing device 22 and the hydraulic drive 44 provided in any of the embodiments of the second aspect described above.

The first valve port 226 of the reversing device 22 is communicated with the first oil passage 201 of the central swivel joint 100, and the second valve port 228 of the reversing device 22 is communicated with the second oil passage 202; the hydraulic drive 44 has an oil inlet connected to the third port 230 of the reversing device 22, and an oil outlet connected to the fourth port 232 of the reversing device 22.

The hydraulic control system 200 provided by the present invention can use two oil paths formed in the central revolving joint 100 as an oil supply path and an oil return path, respectively, and the arrangement of the reversing device 22 ensures that the oil supply path is always communicated with the oil inlet of the hydraulic driving member 44 and the oil return path is always communicated with the oil return port of the hydraulic driving member 44 during the rotation of the second revolving body 4 of the central revolving joint 100.

For example, in the case where the first annular groove 6 and the second annular groove 8 are provided in the second rotating body 4, the first oil port 402 of the center rotating joint 100 is used as an oil inlet passage, the supplied high-pressure hydraulic oil passes through the center rotating joint 100, enters the reversing device 22 through one of the first oil passage 201 and the second oil passage 202, passes through the reversing device 22, and enters the hydraulic driver 44 through the third oil port 230 of the reversing device 22, when the second rotating body 4 of the center rotating joint 100 rotates, the communication state between the first oil port 402 and the first oil passage 201 or the second oil passage 202 changes, and when the first oil passage 201 is communicated with the other of the first oil passage 201 and the second oil passage 202, the reversing device 22 reverses to ensure that the third oil port 230 of the reversing device 22 outputs the high-pressure hydraulic oil.

For example, in the case where the first annular groove 6 and the second annular groove 8 are provided in the first rotating body 2, the second oil port 404 of the center rotating joint 100 is used as an oil inlet passage, the supplied high-pressure hydraulic oil passes through the center rotating joint 100, enters the reversing device 22 through one of the first oil passage 201 or the second oil passage 202, passes through the reversing device 22, and enters the hydraulic driver 44 through the third valve port 230 of the reversing device 22, when the second rotating body 4 of the center rotating joint 100 rotates, the communication state of the second oil port 404 with the first oil passage 201 or the second oil passage 202 changes, and when the second oil port 404 is communicated with the other of the first oil passage 201 or the second oil passage 202, the reversing device 22 reverses to ensure that the third valve port 230 of the reversing device 22 outputs the high-pressure hydraulic oil.

Specifically, a hydraulic driver 44 directional control valve may also be provided between the hydraulic driver 44 and the directional control device 22 to control the direction of the hydraulic oil supply to the hydraulic driver 44.

In an embodiment of the present invention, further, as shown in fig. 10 and 11, the reversing device 22 is a two-position four-way electromagnetic reversing valve 222; or as shown in fig. 12, the reversing device 22 is a two-position four-way hydraulic control reversing valve 224; or as shown in fig. 13, the reversing device 22 includes: a first oil supply path, one end of which is communicated with the first valve port 226 and the other end is communicated with the third valve port 230, the first oil supply path is provided with a first check valve 234, and the inlet of the first check valve 234 is communicated with the first valve port 226; a second oil supply path, one end of which is communicated with the second valve port 228, and the other end is communicated with the third valve port 230, the second oil supply path is provided with a second check valve 236, and the inlet of the second check valve 236 is communicated with the second valve port 228; a first oil return path, one end of which is connected to the first port 226 and the other end of which is connected to the fourth port 232, wherein the first oil return path is provided with a third check valve 238, and an inlet of the third check valve 238 is connected to the fourth port 232; one end of the second oil return path is connected to the second valve port 228, the other end is connected to the fourth valve port 232, a fourth check valve 240 is disposed on the second oil return path, and an inlet of the fourth check valve 240 is connected to the fourth valve port 232.

Specifically, when the reversing device 22 is a one-way valve bridge structure, the one-way valve bridge structure includes a first oil supply path, a second oil supply path, a first oil return path, and a second oil return path, the first oil supply path is provided with a first one-way valve 234, the second oil supply path is provided with a second one-way valve 236, the first oil return path is provided with a third one-way valve 238, the second oil return path is provided with a fourth one-way valve 240, it is ensured that the high-pressure hydraulic oil supplied via one of the first oil path 201 or the second oil path 202 can only be supplied to the routing port of the hydraulic driver 44 through the first oil supply path or the second oil supply path via the center return adapter 100, and the low-pressure hydraulic oil returned via the hydraulic driver 44 can only be returned to the other of the first oil return path and the second oil return path of the center rotary joint 100 through the first oil return path or the second oil return path.

In one embodiment of the present invention, as shown in fig. 14, in a case where the first annular groove 6 and the second annular groove 8 are provided in the second rotation body 4, and the first rotation body 2 is further provided with a third oil passage 204 and a fourth oil passage 206, the third oil passage 204 is communicated with one of the first annular groove 6 and the second annular groove 8, and the fourth oil passage 206 is communicated with the other of the first annular groove 6 and the second annular groove 8, the present invention further includes: a seventh direction valve, which is disposed between the central rotary joint 100 and the direction device 22, and a first execution valve port of the seventh direction valve is communicated with the first oil duct 201, a second execution valve port of the seventh direction valve is communicated with the third oil duct 204, and an oil outlet valve port of the seventh direction valve is communicated with the first valve port 226 of the direction device 22; an eighth direction valve disposed between the central rotary joint 100 and the direction changing device 22, wherein a first execution port of the eighth direction valve is communicated with the second oil passage 202, a second execution port of the eighth direction valve is communicated with the fourth oil passage 206, and an oil outlet port of the eighth direction valve is communicated with the second port 228 of the direction changing device 22; the fifth sensor is connected to the first oil duct 201 and the third oil duct 204 and used for acquiring fifth oil pressure information in the first oil duct 201 and the third oil duct 204; the sixth sensor is connected to the second oil passage 202 and the fourth oil passage 206 and used for acquiring sixth oil pressure information in the second oil passage 202 and the fourth oil passage 206; and the third controller is connected with the fifth inductor and the sixth inductor and is used for controlling the seventh reversing valve to reverse under the condition that the fifth oil pressure information is abnormal and controlling the eighth reversing valve to reverse under the condition that the sixth oil pressure information is abnormal. Or the first annular groove 6 and the second annular groove 8 are disposed on the first rotation body 2, the second rotation body 4 is further provided with a third oil port 406 and a fourth oil port 408, the third oil port 406 is communicated with one of the first annular groove 6 and the second annular groove 8, and the fourth oil port 408 is communicated with the other one of the first annular groove 6 and the second annular groove 8, and the oil-gas separator further includes: a ninth direction valve 54, a first executing valve port of the ninth direction valve 54 is communicated with the first oil port 402, and a second executing valve port of the ninth direction valve 54 is communicated with the third oil port 406; a tenth directional control valve 56, a first implement valve port of the tenth directional control valve 56 is communicated with the second oil port 404, and a second implement valve port of the tenth directional control valve 56 is communicated with the fourth oil port 408; a seventh sensor 48 connected to the first port 402 and the third port 406, for acquiring seventh oil pressure information in the first port 402 and the third port 406; wherein, the oil inlet valve port of the ninth reversing valve 54 or the oil inlet valve port of the tenth reversing valve 56 is communicated with an oil source; the eighth sensor 50 is connected to the second port 404 and the fourth port 408, and is configured to obtain eighth oil pressure information in the second port 404 and the fourth port 408; and a fourth controller 52 connected to the third sensor and the fourth sensor, wherein the fourth controller 52 controls the ninth direction switching valve 54 to perform a direction switching operation when the seventh oil pressure information is abnormal, and controls the tenth direction switching valve 56 to perform a direction switching operation when the eighth oil pressure information is abnormal.

In this embodiment, in the case where the center swivel joint 100 includes the third oil passage 204 and the fourth oil passage 206, the working vehicle includes a seventh direction changing valve, an eighth direction changing valve, a fifth inductor, a sixth inductor, and a third controller.

Specifically, the fifth sensor is configured to obtain fifth oil pressure information in the first oil passage 201 and the third oil passage 204, and when the fifth oil pressure information is abnormal, it may be considered that one of the first oil passage 201 or the third oil passage 204 in the current state is blocked by a partition between the first annular groove 6 and the second annular groove 8, and at this time, the seventh directional control valve may be controlled by the third controller to change the direction, so that the working state of the first oil passage 201 and the third oil passage 204 is changed, and the other of the first oil passage 201 or the third oil passage 204 is communicated with the first annular groove 6 and the second annular groove 8, thereby avoiding throttle loss.

Specifically, the sixth sensor is configured to obtain sixth oil pressure information in the second oil passage 202 and the fourth oil passage 206, and when the sixth oil pressure information is abnormal, it may be considered that one of the second oil passage 202 or the fourth oil passage 206 in the current state is blocked by the partition between the first annular groove 6 and the second annular groove 8, and at this time, the eighth directional control valve may be controlled by the third controller to change the working state of the second oil passage 202 and the fourth oil passage 206, so that the other of the second oil passage 202 or the fourth oil passage 206 is communicated with the first annular groove 6 and the second annular groove 8, thereby avoiding throttling loss.

In this embodiment, in the case that the center swivel joint 100 includes the third oil port 406 and the fourth oil port 408, the working vehicle includes the ninth direction valve 54, the tenth direction valve 56, the seventh inductor 48, the eighth inductor 50, and the fourth controller 52.

Specifically, the seventh sensor 48 is configured to obtain seventh oil pressure information in the first oil port 402 and the third oil port 406, when the seventh oil pressure information is abnormal, it may be considered that one of the first oil port 402 or the third oil port 406 in the current state is blocked by the partition plate between the first annular groove 6 and the second annular groove 8, and at this time, the ninth reversing valve 54 may be controlled by the fourth controller 52 to reverse, so as to change the working states of the first oil port 402 and the third oil port 406, so that the other of the first oil port 402 or the third oil port 406 is communicated with the first annular groove 6 and the second annular groove 8, thereby avoiding throttling loss.

Specifically, the eighth sensor 50 is configured to obtain eighth oil pressure information in the second oil port 404 and the fourth oil port 408, when the eighth oil pressure information is abnormal, it may be considered that one of the second oil port 404 or the fourth oil port 408 in the current state is blocked by the partition between the first annular groove 6 and the second annular groove 8, and at this time, the tenth reversing valve 56 may be controlled by the fourth controller 52 to reverse, so as to change the working states of the second oil port 404 and the fourth oil port 408, so that the other of the second oil port 404 or the fourth oil port 408 is communicated with the first annular groove 6 and the second annular groove 8, thereby avoiding throttling loss.

In a fifth aspect embodiment of the present invention, as shown in fig. 13 or 14, there is provided a work vehicle 300 according to the present invention, including: any of the above embodiments provides a hydraulic control system 200, a hydraulic oil pump 24 and an actuator 26.

The hydraulic oil pump 24 is communicated with the first oil channel 201 or the second oil channel 202 of the central swivel joint 100 through an oil supply path; or as shown in fig. 13, the hydraulic oil pump 24 is communicated with the oil inlet valve port of the fourth direction valve 36 or the oil inlet valve port of the third direction valve 34 through an oil supply path; or the hydraulic oil pump 24 is communicated with the first oil port 402 or the second oil port 404 of the central swivel joint 100 through an oil supply path; or as shown in fig. 14, the hydraulic oil pump 24 is communicated with the oil inlet valve port of the ninth directional control valve 54 or the oil inlet valve port of the tenth directional control valve 56 through the oil supply path; the actuator 26 is connected to a hydraulic drive 44.

Since the work vehicle 300 according to the present invention includes the hydraulic control system 200, the work vehicle 300 according to the present invention has all the advantageous effects of the hydraulic control system 200 provided in the work vehicle 300 according to the present invention.

Specifically, the work vehicle 300 may be another vehicle with a rotating part, such as an excavator, a crane, or a pump truck.

In an embodiment of the present invention, as shown in fig. 13 and 14, further, the present invention further includes: the first reversing valve 28 is arranged on the oil supply path, the hydraulic oil pump 24 is communicated with an oil inlet valve port of the first reversing valve 28, a first execution valve port of the first reversing valve 28 is communicated with the first oil duct 201, and a second execution valve port of the first reversing valve 28 is communicated with the second oil duct 202; and/or a rotary motor 30 that is communicated with the hydraulic oil pump 24 through a drive oil passage. The hydraulic oil pump 24 is connected to an oil inlet port of the second direction valve 32, a first implement port of the second direction valve 32 is connected to a first implement port of the rotary motor 30, and a second implement port of the rotary motor 30 is connected to a second implement port of the second direction valve 32.

In this embodiment, a first direction valve 28, a swing motor 30, and a second direction valve 32 are further included. Through the arrangement of the first direction changing valve 28, the hydraulic oil output by the hydraulic oil pump 24 can be supplied to one of the first oil passage 201 and the second oil passage 202 in the center swivel joint 100 through the first direction changing valve 28, and the low-pressure hydraulic oil returned through the other of the first oil passage 201 and the second oil passage 202 can be returned to the oil tank through the first direction changing valve 28; by providing the swing motor 30 and the second direction change valve 32, the first implement port through which the high-pressure hydraulic oil can be supplied to the swing motor 30 by the hydraulic oil pump 24 can drive the swing motor 30 to rotate, and the second implement port of the swing motor 30 via the swing motor 30 can be returned to the tank through the second implement port of the second direction change valve 32.

Detailed description of the preferred embodiment 1

As shown in fig. 1a and 1b, an embodiment of the present invention provides a center rotary joint 100, as shown in fig. 1a and 1b, the center rotary joint 100 includes a second rotary body 4, a first rotary body 2, and a sealing member 18, wherein the first rotary body 2 and the second rotary body 4 are in a relative concept, that is, the first rotary body 2 may be fixed to a supporting portion of a work vehicle or a work machine or may be fixed to a rotary portion of the work machine. The second rotator 4 is provided with a first oil port 402, a second oil port 404, a first annular groove 6 and a second annular groove 8, and multiple layers of oil ports and annular grooves (two layers of annular grooves in fig. 1a and 1 b) may be distributed as required, and the first oil port 402 and the second oil port 404 are distributed around the second rotator 4. Two partition plates are arranged between the first annular groove 6 and the second annular groove 8 to divide the same layer of annular groove into two annular oil passages, and the first annular groove 6 and the second annular groove 8 are fixedly communicated with the first oil port 402 and the second oil port 404 respectively. The first revolving body 2 is provided with a first oil passage 201 and a second oil passage 202, and the first oil passage 201 and the second oil passage 202 on the same layer are fixedly communicated with the first annular groove 6 and the second annular groove 8 on the same layer on the second revolving body 4. The first annular groove 6 and the second annular groove 8 on the second rotating body 4 switch the oil passages communicating with the first rotating body 2 according to the rotating position. The second rotor 4 is provided with a seal ring annular mounting groove 16 for mounting a seal member 18 to prevent leakage of oil.

Further, the central rotary joint 100 provided in this embodiment is suitable for being provided with an annular groove structure on the first rotary body 2, and the structure thereof is as shown in fig. 2a and fig. 2b, the second rotary body 4 is provided with a first oil port 402 and a second oil port 404, the second rotary body 4 is a multi-layer structure, and each layer is provided with a group of the first oil port 402 and the second oil port 404. The first revolving body 2 is provided with a first oil duct 201, a second oil duct 202, a first annular groove 6 and a second annular groove 8, the first revolving body 2 is also of a multilayer structure, and the first oil duct 201 and the second oil duct 202 on the same layer of the first revolving body 2 are respectively communicated with the first annular groove 6 and the second annular groove 8 on the first revolving body 2. Two partition plates are arranged between the first annular groove 6 and the second annular groove 8 of the first revolving body 2 to separate the first annular groove 6 from the second annular groove 8, and the first oil duct 201 and the second oil duct 202 on the first revolving body 2 can switch oil ports communicated with the second revolving body 4 according to revolving positions. A seal ring annular mounting groove 16 is provided in the first rotating body 2, and a seal member 18 is mounted to prevent oil leakage.

Further, as shown in fig. 3a and 3b, the central rotary joint 100 includes a second rotary body 4, a first rotary body 2, and a sealing member 18, wherein the second rotary body 4 is provided with a first oil port 402, a second oil port 404, a first annular groove 6, and a second annular groove 8, and the first oil port 402 and the second oil port 404 are distributed on the periphery of the second rotary body 4. Two partition plates are arranged between the first annular groove 6 and the second annular groove 8, a connecting line between the first annular groove 6 and the second annular groove 8 and the two partition plates is in a ring shape, and the partition plates separate the first annular groove 6 from the second annular groove 8. The first annular groove 6 is fixedly communicated with the first oil port 402, and the second annular groove 8 is fixedly communicated with the second oil port 404. The first revolving body 2 is of a multilayer structure and is provided with a plurality of first oil ducts 201 and a plurality of second oil ducts 202, the same layer is provided with the first oil ducts 201, the second oil ducts 202, the third oil ducts 204 and the fourth oil ducts 206, the first oil ducts 201 and the third oil ducts 204 on the first revolving body 2 cannot be simultaneously shielded by partition plates, the second oil ducts 202 and the fourth oil ducts 206 cannot be simultaneously shielded by partition plates, and the first annular groove 6 and the second annular groove 8 on the second revolving body 4 can be switched to oil ducts communicated with the first revolving body 2 according to the revolving position. A, the first oil passage 201 and the second oil passage 202 are symmetrically distributed, and the third oil passage 204 and the fourth oil passage 206 are symmetrically distributed. The second rotor 4 is provided with a seal ring annular mounting groove 16 for mounting a seal member 18 to prevent leakage of oil.

Further, as shown in fig. 3a and 3b, the central rotary joint 100 of the present embodiment is extended to be suitable for pump trucks, fire trucks, etc. which need to transport oil, electrical signals, materials (including water, concrete, etc.) at the same time, and the central rotary joint 100 includes a second rotary body 4, a first rotary body 2, a sealing element 18, and a conductive slip ring 12. A material conveying hole 10 is additionally arranged in the direction of the central axis in the first rotating body 2, and a material conveying pipe passes through the material conveying hole 10; an electrical harness hole 14 is provided in the axial direction, and the electrical harness hole 14 allows a harness of the conductive slip ring 12 to pass therethrough. The conductive slip ring 12 is coaxially arranged at the upper part of the first rotating body 2 and can rotate around the first rotating body 2, and conductive wires are arranged in the axial direction of the inner periphery of the conductive slip ring 12, and each conductive wire is in electrical contact with a corresponding conductive wire bundle during the relative rotation of the conductive slip ring 12 and the first rotating body 2.

Specific example 2

As shown in fig. 5 to 8, an embodiment of the present invention provides a hydraulic control system 200, which includes the central swivel joint 100, the reversing device 22 and the hydraulic driving member 44 of any one of the above embodiments. In order to ensure that the two oil passages on the same layer of the central rotary joint 100 can supply high-pressure hydraulic oil and return low-pressure hydraulic oil, considering that the flow passages on the first rotary body 2 switch the communication direction with the oil ports of the second rotary body 4 when the central rotary joint 100 rotates with the second rotary body 4, a reversing device 22 is arranged between the hydraulic driving member 44 and the central rotary joint 100. As shown in fig. 5, the center swivel joint 100 is added to the construction machine to achieve that a first oil channel 201 of the center swivel joint 100 on the fixed system is communicated with an oil inlet of the hydraulic driver 44, and a second oil channel 202 of the center swivel joint 100 on the fixed system is communicated with an oil outlet of the hydraulic driver 44. The central swivel joint 100 and the reversing device 22 can achieve this function by the principle: the sensor is arranged on the center rotary joint 100, the initial state of the center rotary joint 100 is that the first oil duct 201 is communicated with the first oil port 402, the second oil duct 202 is communicated with the second oil port 404, the initial state of the reversing device 22 is that the first valve port 226 is communicated with the third valve port 230, and the second valve port 228 is communicated with the fourth valve port 232. When the sensor detects that the internal oil passage of the center swivel joint 100 is communicated with the direction change, i.e., the first oil passage 201 of the center swivel joint 100 is communicated with the second oil port 404, and the second oil passage 202 is communicated with the first oil port 402, the sensor triggers a command that the internal oil passage of the direction change device 22 is communicated, i.e., the first valve port 226 is communicated with the fourth valve port 232, and the second valve port 228 is communicated with the third valve port 230. Thereby realizing that the first oil channel 201 of the central swivel joint 100 is communicated with the oil inlet of the hydraulic driver 44, and the second oil channel 202 is communicated with the oil return of the hydraulic driver 44.

Further, as shown in fig. 6, the reversing device 22 may adopt a structure of a two-position four-way electromagnetic reversing valve 222, when the sensing device 242 on the central rotary joint 100 of the central rotary joint 100 detects that the internal oil passage of the central rotary joint 100 leads to reversing, the control device 244 of the engineering machine controls the electromagnetic valve to change to an electric state, so as to ensure that the first oil passage 201 of the central rotary joint 100 is communicated with the oil inlet of the hydraulic driving element 44, and the second oil passage 202 is communicated with the oil return port of the hydraulic driving element 44.

Further, when the first oil passage 201 of the center swivel joint 100 is a port P (high-pressure oil inlet) and the second oil passage 202 is a port T (low-pressure oil return port or low-pressure oil drain port), that is, the oil path runs from the hydraulic oil source to the port P of the center swivel joint 100 and then to the hydraulic driving member 44, and the return oil or the drain oil of the hydraulic driving member 44 returns to the oil tank through the port T of the center swivel joint 100. As shown in fig. 7, the reversing device 22 may adopt a one-way valve bridge structure, the first oil passage 201 is a P port, the second oil passage 202 is a T port, the high-pressure hydraulic oil enters the central swivel joint 100 from the first oil passage 201, if the first oil passage 201 is communicated with the first oil port 402, and the second oil passage 202 is communicated with the second oil port 404, the high-pressure hydraulic oil enters the first valve port 226 from the first one-way valve 234, and the low-pressure hydraulic oil enters from the fourth valve port 232, because the first valve port 226 of the reversing device 22 is high-pressure, the low-pressure hydraulic oil can only pass from the fourth one-way valve 240 to the second oil port 404 of the central swivel joint 100, and then returns to the oil tank through the second oil passage 202, so that the first oil passage 201 of the central swivel joint 100 is communicated with the oil inlet of the hydraulic driving element 44, and the second oil passage 202. If the first oil passage 201 is communicated with the second oil port 404, and the second oil passage 202 is communicated with the first oil port 402, the high-pressure hydraulic oil enters the third valve port 230 from the second check valve 236, and the low-pressure hydraulic oil enters the fourth valve port 232, because the second valve port 228 of the reversing device 22 is high-pressure, the low-pressure hydraulic oil can only pass through the second oil passage 202 from the third check valve 238 to the first oil port 402 of the central swivel joint 100, so that the first oil passage 201 of the central swivel joint 100 is communicated with the oil inlet of the hydraulic driving member 44, and the second oil passage 202 is communicated with the oil outlet of the hydraulic driving member 44.

Further, when the first oil passage 201 of the center swivel joint 100 is a port P (high-pressure oil inlet) and the second oil passage 202 is a port T (low-pressure oil return port or low-pressure oil drain port), that is, the oil path runs from the hydraulic oil source to the port P of the center swivel joint 100 and then to the hydraulic driving member 44, and the return oil or the drain oil of the hydraulic driving member 44 returns to the oil tank through the port T of the center swivel joint 100. As shown in fig. 8, the first oil passage 201 is a P port, the second oil passage 202 is a T port, and when the high-pressure hydraulic oil enters the central swivel joint 100 from the first oil passage 201, if the first oil passage 201 is communicated with the first oil port 402, and the second oil passage 202 is communicated with the second oil port 404, under the action of the high-pressure hydraulic oil, the hydraulic control directional control valve is in the left position, at this time, the first valve port 226 and the third valve port 230 of the directional control device 22 are communicated, and the second valve port 228 and the fourth valve port 232 are communicated, so that the first oil passage 201 of the central swivel joint 100 is communicated with the oil inlet of the hydraulic driving member 44, and the second oil passage 202 is communicated with the oil outlet of the hydraulic driving member. If the first oil duct 201 is communicated with the second oil port 404, and the second oil duct 202 is communicated with the first oil port 402, under the action of the high-pressure hydraulic oil, the pilot-controlled directional control valve is in the right position, at this time, the first valve port 226 and the fourth valve port 232 of the directional control device 22 are communicated, the second valve port 228 and the third valve port 230 are communicated, so that the first oil duct 201 of the central swivel joint 100 is communicated with the oil inlet of the hydraulic driving element 44, and the second oil duct 202 is communicated with the oil outlet of the hydraulic driving element 44.

Specific example 3

As shown in fig. 13, an embodiment of the present invention provides a work vehicle 300 including the hydraulic control system 200, the hydraulic oil pump 24, the first direction changing valve 28, the third direction changing valve 34, the fourth direction changing valve 36, the implement 26, the second direction changing valve 32, the swing motor 30, the first controller 42, the first inductor 38, and the second inductor 40 of any of the above embodiments.

The first annular groove 6 and the second annular groove 8 of the central rotary joint 100 in the hydraulic control system 200 are arranged on the second rotary body 4, the first rotary body 2 is further provided with a third oil passage 204 and a fourth oil passage 206, the third oil passage 204 is communicated with one of the first annular groove 6 and the second annular groove 8, and the fourth oil passage 206 is communicated with the other one of the first annular groove 6 and the second annular groove 8.

The third direction valve 34 and the fourth direction valve 36 may be two-position three-way direction valves.

Wherein, the outlet of the hydraulic oil pump 24 is communicated with the oil inlet valve port (P port) of the first reversing valve 28 and communicated with the oil inlet valve port of the second reversing valve 32; the first implementation port of the first direction valve 28 is communicated with the oil inlet port of the third direction valve 34, and the second implementation port of the first direction valve 28 is communicated with the oil inlet port of the fourth direction valve 36. The first oil channel 201 of the central swivel joint 100 is communicated with the first execution valve port of the third direction valve 34, and the third oil channel 204 of the central swivel joint 100 is communicated with the second execution valve port of the third direction valve 34; the first implementation port of the fourth directional valve 36 is connected to the second oil passage 202, and the second implementation port of the fourth directional valve 36 is connected to the fourth oil passage 206. The third change valve 34 and the fourth change valve 36 are in an initial state that the oil inlet valve port is communicated with the first execution valve port, and the oil inlet valve port is communicated with the first execution valve port when power is supplied; the first port 402 of the central swivel joint 100 is communicated with the first port 226 of the reversing device 22 of the hydraulic control system 200, and the second port 404 of the central swivel joint 100 is communicated with the second port 228 of the reversing device 22 of the hydraulic control system 200; the third valve port 230 of the reversing device 22 is communicated with an oil inlet of the hydraulic driving member 44 of the hydraulic control system 200, and the third valve port 230 of the reversing device 22 is communicated with an oil outlet of the hydraulic driving member 44; the first executing port of the second direction valve 32 is connected to the first executing port of the rotary motor 30, and the second executing port of the rotary motor 30 is connected to the second executing port of the second direction valve 32.

The first controller 42 receives input signals of the first sensor 38 and the second sensor 40, and outputs control information to control the on-off of the second reversing valve 32 and the oil circuit of the reversing device 22 to be reversed. The first sensor 38 outputs a signal to the first controller 42 when the first oil gallery 201 of the dual gallery common center swivel joint 100 is blocked by the partition, and the second sensor 40 outputs a signal to the first controller 42 when the second oil gallery 202 of the center swivel joint 100 is blocked by the partition.

In a working vehicle 300 or a working machine having the hydraulic control system 200 according to any one of the embodiments shown in fig. 13, when the second rotation body 4 of the center rotary joint 100 rotates, a partition portion of the second rotation body 4 blocks an oil passage of the first rotation body 2, and throttling loss occurs. Or completely block the oil passage of the first rotary body 2, so that the oil passages of the central rotary joint 100 cannot be communicated; furthermore, if the oil passage is blocked by the partition plate during the reciprocating rotation, the first controller 42 is triggered to send a signal to control the reversing device 22 to reverse, and the problem of incorrect oil port connection is caused. To solve the above problem, the method for controlling the work vehicle 300 includes the steps of:

the first sensor 38 outputs a signal to the first controller 42 when the first oil passage 201 of the center swivel joint 100 is blocked by the partition;

the second sensor 40 outputs a signal to the first controller 42 when the second oil passage 202 of the center swivel joint 100 is blocked by the partition; and controlling the third reversing valve 34 and the fourth reversing valve 36 to lose power, wherein the third reversing valve 34 and the fourth reversing valve 36 work at the left position, the first valve port 226 of the third reversing valve 34 is communicated with the first oil channel 201 of the central rotary joint 100, the second valve port 228 of the fourth reversing valve 36 is communicated with the second oil channel 202 of the central rotary joint 100, and no throttling loss is generated.

The control method comprises 3 Flag bits, namely Flag1 for judging the electrification of the first inductor 38, Flag2 for judging the electrification of the second inductor 40 and Flag3 for judging the electrification of both the first inductor 38 and the second inductor 40.

When the first inductor 38 and the second inductor 40 are not powered and Flag3 is equal to 0, the Flag1 value remains unchanged, the Flag2 value remains unchanged, the operating positions of the third directional valve 34 and the fourth directional valve 36 remain unchanged, and the operating position of the directional device 22 remains unchanged.

When the first inductor 38 and the second inductor 40 are not powered and Flag3 is equal to 1, Flag1 is equal to 0, Flag2 is equal to 0, Flag3 is equal to 0, the operating positions of the third directional valve 34 and the fourth directional valve 36 are unchanged, and the operating position of the directional device 22 is unchanged.

When the first sensor 38 is electrified and the second sensor 40 is not electrified, the third direction valve 34 and the fourth direction valve 36) are controlled to be electrified, the third direction valve 34 and the fourth direction valve 36 work at the right position, the first valve port 226 of the third direction valve 34 is communicated with the third oil channel 204 of the central rotary joint 100, the first valve port 226 of the fourth direction valve 36 is communicated with the third oil channel 204 of the central rotary joint 100, and no throttling loss is generated. The Flag1 value is 1, the Flag2 value is unchanged, the Flag3 value is unchanged, and the operating position of the reversing device 22 is unchanged.

When the second inductor 40 is electrified and the first inductor 38 is not electrified, the third direction-changing valve 34 and the fourth direction-changing valve 36 are controlled not to be electrified, the third direction-changing valve 34 and the fourth direction-changing valve 36 work in a left position, in this time, the first valve port 226 of the third direction-changing valve 34 is communicated with the first oil duct 201 of the central rotary joint 100, the first valve port 226 of the fourth direction-changing valve 36 is communicated with the second oil duct 202 of the central rotary joint 100, and no throttling loss is generated. The Flag2 value is 1, the Flag1 value is unchanged, the Flag3 value is unchanged, and the operating position of the reversing device 22 is unchanged.

When the flag2 is equal to 1, the flag1 is equal to 1, and the flag3 is equal to 1, the third directional valve 34 and the fourth directional valve 36 are unchanged in state, and the operating position of the directional device 22 is reversed.

In the present invention, the terms "mounting," "connecting," "fixing," and the like are used in a broad sense, for example, "connecting" may be a fixed connection, a detachable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A center swivel joint, comprising:

the oil pump comprises a first revolving body, a second revolving body and a third revolving body, wherein a first oil duct and a second oil duct are arranged in the first revolving body;

the second revolving body is sleeved on the outer side of the first revolving body, is rotatably connected with the first revolving body, and is provided with a first oil port and a second oil port;

a first annular groove provided between the first and second rotators;

a second annular groove provided between the first and second rotators;

the partition plate is arranged between the first annular groove and the second annular groove and used for separating the first annular groove from the second annular groove;

the first annular groove and the second annular groove are located on the same radial section of the first revolving body or the second revolving body, the first oil port is communicated with one of the first annular groove and the second annular groove, the second oil port is communicated with the other of the first annular groove and the second annular groove, the first oil channel is communicated with one of the first annular groove and the second annular groove, and the second oil channel is communicated with the other of the first annular groove and the second annular groove.

2. A central swivel joint according to claim 1,

the first annular groove and the second annular groove are arranged on the inner circumferential surface of the second revolving body, the first oil port is communicated with the first annular groove, the second oil port is communicated with the second annular groove, the first oil duct is communicated with one of the first annular groove and the second annular groove, and the second oil duct is communicated with the other one of the first annular groove and the second annular groove; or

The first annular groove and the second annular groove are arranged on the outer peripheral surface of the first revolving body, the first oil duct is communicated with the first annular groove, the second oil duct is communicated with the second annular groove, the first oil port is communicated with one of the first annular groove and the second annular groove, and the second oil port is communicated with the other of the first annular groove and the second annular groove.

3. A central swivel joint according to claim 2,

the first annular groove and the second annular groove are in multiple layers, and the multiple layers of the first annular groove and the second annular groove are arranged at intervals along the axis direction of the second revolving body;

the first oil ports and the second oil ports are multiple and are respectively arranged corresponding to the first annular grooves and the second annular grooves in multiple layers;

the first oil duct and the second oil duct are multiple, the multiple first oil ducts and the multiple second oil ducts are divided into multiple groups, and the first annular groove and the second annular groove at the same height are matched with the first oil duct and the second oil duct in one group.

4. A central swivel joint according to claim 2,

in a case where the first annular groove and the second annular groove are provided on the inner peripheral surface of the second rotator, the rotor further includes:

the third oil duct is arranged in the first rotary body and communicated with one of the first annular groove and the second annular groove;

the fourth oil duct is arranged in the first rotary body and communicated with the other one of the first annular groove and the second annular groove;

the section of the first revolving body is circular, the first oil duct and the second oil duct are distributed in a centrosymmetric manner around the center of circle of the section of the first revolving body, and the third oil duct and the fourth oil duct are distributed in a centrosymmetric manner around the center of circle of the section of the first revolving body; or

The first annular groove and the second annular groove are provided on the outer peripheral surface of the first rotation body, and further include:

a third oil port provided in the second rotary body, the third oil port being communicated with one of the first semi-annular groove and the second annular groove;

a fourth oil port provided in the second rotary body, the fourth oil port being communicated with the other of the first semi-annular groove and the second annular groove;

the section of the second revolving body is circular, the first oil port and the second oil port are distributed in a centrosymmetric manner with the center of circle of the section of the second revolving body, and the third oil port and the fourth oil port are distributed in a centrosymmetric manner with the center of circle of the section of the second revolving body.

5. The central swivel joint according to any of claims 1 to 4, further comprising:

the material conveying hole is formed in the first rotary body; and/or

The conductive slip ring is arranged on the first revolving body and can rotate relative to the first revolving body;

the electric wiring harness hole is formed in the first rotating body, and an electric wiring harness can penetrate through the electric wiring harness hole to be connected to the conductive slip ring; and/or

The mounting grooves are formed in the first rotary body or the second rotary body and are positioned at the top and the bottom of the first annular groove and the second annular groove;

and the sealing element is arranged in the mounting groove.

6. A hydraulic control system, comprising:

the central swivel joint of any one of claims 1 to 5;

a first valve port of the reversing device is communicated with a first oil port of the central rotary joint, and a second valve port of the reversing device is communicated with a second oil port;

an oil inlet of the hydraulic driving part is communicated with a third valve port of the reversing device, and an oil outlet of the hydraulic driving part is communicated with a fourth valve port of the reversing device.

7. The hydraulic control system of claim 6,

the reversing device is a two-position four-way electromagnetic reversing valve; or

The reversing device is a two-position four-way hydraulic control reversing valve; or

The reversing device comprises:

one end of the first oil supply path is communicated with the first valve port, the other end of the first oil supply path is communicated with the third valve port, a first check valve is arranged on the first oil supply path, and an inlet of the first check valve is communicated with the first valve port;

one end of the second oil supply pipeline is communicated with the second valve port, the other end of the second oil supply pipeline is communicated with the third valve port, the second oil supply pipeline is provided with a second one-way valve, and an inlet of the second one-way valve is communicated with the second valve port;

one end of the first oil return way is communicated with the first valve port, the other end of the first oil return way is communicated with the fourth valve port, a third one-way valve is arranged on the first oil return way, and an inlet of the third one-way valve is communicated with the fourth valve port;

one end of the second oil return path is communicated with the second valve port, the other end of the second oil return path is communicated with the fourth valve port, a fourth one-way valve is arranged on the second oil return path, and an inlet of the fourth one-way valve is communicated with the fourth valve port.

8. The hydraulic control system according to claim 6 or 7, wherein in a case where the first annular groove and the second annular groove are provided on the second rotation body, and a third oil passage and a fourth oil passage are further provided on the first rotation body, the third oil passage communicates with one of the first annular groove and the second annular groove, and the fourth oil passage communicates with the other of the first annular groove and the second annular groove, the hydraulic control system further comprises:

a first execution valve port of the third reversing valve is communicated with the first oil duct, and a second execution valve port of the third reversing valve is communicated with the third oil duct;

a first executing valve port of the fourth reversing valve is communicated with the second oil duct, and a second executing valve port of the fourth reversing valve is communicated with the fourth oil duct;

the oil inlet valve port of the fourth reversing valve or the oil inlet valve port of the third reversing valve is communicated with an oil source;

the first sensor is connected to the first oil duct and the third oil duct and used for acquiring first oil pressure information in the first oil duct and the third oil duct;

the second sensor is connected to the second oil duct and the fourth oil duct and used for acquiring second oil pressure information in the second oil duct and the fourth oil duct;

the first controller is connected with the first sensor and the second sensor and is used for controlling the third reversing valve to reverse under the condition that the first oil pressure information is abnormal and controlling the fourth reversing valve to reverse under the condition that the second oil pressure information is abnormal; or

The first annular groove and the second annular groove are arranged on the first revolving body, the second revolving body is further provided with a third oil port and a fourth oil port, the third oil port is communicated with one of the first annular groove and the second annular groove, and the fourth oil port is communicated with the other one of the first annular groove and the second annular groove, and the oil pump further comprises:

the first executing valve port of the first reversing valve is communicated with the first oil port, the second executing valve port of the first reversing valve is communicated with the second oil port, and the oil outlet valve port of the first reversing valve is communicated with the first valve port of the reversing device;

the first executing valve port of the first reversing valve is communicated with the first oil port, the second executing valve port of the first reversing valve is communicated with the second oil port, and the oil outlet valve port of the first reversing valve is communicated with the second valve port of the reversing device;

the third sensor is connected to the first oil port and the third oil port and used for acquiring third oil pressure information in the first oil port and the third oil port;

the fourth sensor is connected to the second oil port and the fourth oil port and used for acquiring fourth oil pressure information in the second oil port and the fourth oil port;

and the second controller is connected with the third sensor and the fourth sensor and is used for controlling the fifth reversing valve to reverse under the condition that the third oil pressure information is abnormal and controlling the sixth reversing valve to reverse under the condition that the fourth oil pressure information is abnormal.

9. A hydraulic control system, comprising:

the central swivel joint of any one of claims 1 to 5;

a first valve port of the reversing device is communicated with the first oil duct of the central rotary joint, and a second valve port of the reversing device is communicated with the second oil duct;

10. The hydraulic control system of claim 9,

The reversing device comprises:

11. The hydraulic control system according to claim 9 or 10, wherein in a case where the first annular groove and the second annular groove are provided on the second rotation body, and a third oil passage and a fourth oil passage are further provided on the first rotation body, the third oil passage communicates with one of the first annular groove and the second annular groove, and the fourth oil passage communicates with the other of the first annular groove and the second annular groove, the hydraulic control system further comprises:

the first executing valve port of the first reversing valve is communicated with the first oil duct, the second executing valve port of the first reversing valve is communicated with the second oil duct, and the oil outlet valve port of the first reversing valve is communicated with the first valve port of the reversing device;

the first executing valve port of the eighth reversing valve is communicated with the second oil duct, the second executing valve port of the eighth reversing valve is communicated with the fourth oil duct, and the oil outlet valve port of the eighth reversing valve is communicated with the second valve port of the reversing device;

the fifth sensor is connected to the first oil duct and the third oil duct and used for acquiring fifth oil pressure information in the first oil duct and the third oil duct;

the sixth sensor is connected to the second oil duct and the fourth oil duct and used for acquiring sixth oil pressure information in the second oil duct and the fourth oil duct;

a third controller connected to the fifth sensor and the sixth sensor, the third controller being configured to control the seventh directional control valve to perform directional control when the fifth oil pressure information is abnormal, and to control the eighth directional control valve to perform directional control when the sixth oil pressure information is abnormal; or

a first executing valve port of the ninth reversing valve is communicated with the first oil port, and a second executing valve port of the ninth reversing valve is communicated with the third oil port;

a first executing valve port of the tenth reversing valve is communicated with the second oil port, and a second executing valve port of the tenth reversing valve is communicated with the fourth oil port;

the oil inlet valve port of the ninth reversing valve or the oil inlet valve port of the tenth reversing valve is communicated with an oil source;

the seventh sensor is connected to the first oil port and the third oil port and used for acquiring seventh oil pressure information in the first oil port and the third oil port;

the eighth sensor is connected to the second oil port and the fourth oil port and used for acquiring eighth oil pressure information in the second oil port and the fourth oil port;

and a fourth controller connected to the third sensor and the fourth sensor, the fourth controller being configured to control the ninth direction switching valve to switch when the seventh oil pressure information is abnormal, and to control the tenth direction switching valve to switch when the eighth oil pressure information is abnormal.

12. A work vehicle, characterized by comprising:

a hydraulic oil pump;

the hydraulic control system according to claim 6 or 7, wherein the hydraulic oil pump is communicated with the first oil passage or the second oil passage of the center swivel joint through an oil supply passage; or

The hydraulic control system of claim 8, wherein the hydraulic oil pump is connected to the oil inlet port of the fourth directional control valve or the oil inlet port of the third directional control valve through an oil supply path; or

The hydraulic control system according to claim 9 or 10, wherein the hydraulic oil pump is communicated with the first oil port or the second oil port of the center swivel joint through an oil supply passage; or

The hydraulic control system of claim 11, wherein the hydraulic oil pump is connected to the oil inlet port of the ninth directional control valve or the oil inlet port of the tenth directional control valve through an oil supply path;

and the executing piece is connected to the hydraulic driving piece.

13. The work vehicle of claim 12, further comprising:

the hydraulic oil pump is communicated with an oil inlet valve port of the first reversing valve;

in the case where the work vehicle includes the hydraulic control system according to claim 6 or 7, the first implement port of the first direction valve is communicated with the first oil passage, and the second implement port of the first direction valve is communicated with the second oil passage; in the case that the work vehicle includes the hydraulic control system according to claim 8, the first implement port of the first directional valve is communicated with the oil inlet port of the fourth directional valve, and the second implement port of the first directional valve is communicated with the oil inlet port of the third directional valve; in the case where the work vehicle includes the hydraulic control system of claim 9 or 10, the first implement port of the first directional valve is communicated with the first oil port, and the second implement port of the first directional valve is communicated with the second oil port; in the case where the work vehicle includes the hydraulic control system according to claim 11, the first implement port of the first directional control valve is communicated with the oil inlet port of the ninth directional control valve, and the second implement port of the first directional control valve is communicated with the oil inlet port of the tenth directional control valve;

and/or

The rotary motor is communicated with the hydraulic oil pump through a driving oil path and is used for driving the first rotary body and the second rotary body to rotate relatively;

and the hydraulic oil pump is communicated with an oil inlet valve port of the second reversing valve, a first execution valve port of the second reversing valve is communicated with a first execution valve port of the rotary motor, and a second execution valve port of the rotary motor is communicated with a second execution valve port of the second reversing valve.