CN115559952A

CN115559952A - Upper vehicle sliding and rotating hydraulic system and engineering machinery

Info

Publication number: CN115559952A
Application number: CN202211279483.4A
Authority: CN
Inventors: 郭强; 安光达; 肖承丰; 邹婿邵; 陈孝金
Original assignee: Hunan Zoomlion Intelligent Aerial Work Machinery Co Ltd
Current assignee: Hunan Zoomlion Intelligent Aerial Work Machinery Co Ltd
Priority date: 2022-10-19
Filing date: 2022-10-19
Publication date: 2023-01-03

Abstract

The application discloses a boarding and sliding hydraulic system and engineering machinery, wherein the boarding and sliding hydraulic system comprises a rotary motor hydraulic circuit and a rotary braking control oil circuit, the rotary motor hydraulic circuit is provided with a rotary motor and a main reversing valve for switching and controlling the rotary motor, and the rotary braking control oil circuit is provided with a rotary speed reducer brake for braking and controlling the rotary motor; the oil taking port of the braking pressure oil in the rotary braking control oil path and the oil feeding port of the main reversing valve are arranged in parallel or are independently connected with a pressure oil source. The engineering machinery comprises an upper part, a lower part for walking and an upper part sliding and rotating hydraulic system, and a rotating motor is used for driving the upper part to rotate. This application is connected the oil intaking mouth of gyration braking control oil circuit before the main change valve, before the gyration of getting on the bus, can remove the braking in advance, and whether the release of braking can independent control, when the gyration action stops, can the certain angle of slip eliminate the inertia influence, guarantees the stationarity of the partial operation of getting on the bus.

Description

Upper vehicle sliding and rotating hydraulic system and engineering machinery

Technical Field

The application belongs to the field of hydraulic systems of engineering machinery, and particularly relates to engineering machinery and a boarding slip hydraulic system thereof.

Background

Construction machines such as telescopic boom forklift trucks, aerial work platforms and the like typically include a horizontal slewing mechanism for the upper vehicle portion. As shown in fig. 1, the horizontal swing mechanism includes a swing motor 10 and a swing reducer brake 9 for braking the swing motor 10, wherein brake pressure oil of the swing reducer brake 9 is taken from a valve rear end of a main directional control valve of the swing motor 10, and specifically, a hydraulic control chamber of the illustrated swing reducer brake 9 is connected to working oil passages at both ends of the swing motor 10 through a shuttle valve 12, that is, a larger oil pressure of the working oil passages at both ends is flowed as the brake pressure oil to the hydraulic control chamber of the swing reducer brake 9.

Meanwhile, a hydraulic control cavity of the rotary speed reducer brake 9 returns oil through an oil way provided with a ball valve 13. It is obvious that the release of the brake is interlocked with the turning operation when the ball valve 13 is not opened, and the brake is released for a long time when the ball valve 13 is opened, and the brake is performed after the ball valve 13 is manually closed.

However, the reduction gear brake shown in the figure cannot be released alone, and it is necessary to release the brake by follow-up during the turning operation. If the control valve set of the rotary motor 10 is stuck or the pump set is damaged and stable and sufficient pressure oil cannot be provided, the horizontal rotary mechanism cannot normally release braking and rotation at this time, and certain difficulty exists in overhauling or moving equipment. Meanwhile, in view of synchronous operation of rotation and brake release, when the rotation of the equipment is finished, the equipment can be immediately braked, and the equipment is possibly instable on the vehicle due to the influence of rotation inertia, so that unsafe factors are brought.

Disclosure of Invention

The application aims to provide a boarding slip hydraulic system and engineering machinery, so that rotation and braking control are independent and convenient, and boarding slip is stable.

In order to achieve the above object, a first aspect of the present application provides a boarding hydraulic system, including:

the hydraulic circuit of the rotary motor is provided with the rotary motor and a main reversing valve for switching and controlling the rotary motor; and

the rotary brake control oil path is provided with a rotary speed reducer brake for controlling the rotary motor in a braking manner;

and an oil taking port of the braking pressure oil in the rotary braking control oil path and a valve oil inlet port of the main reversing valve are arranged in parallel or are independently connected with a pressure oil source.

In an embodiment of the present application, the swing brake control oil passage includes:

and the braking reversing valve comprises a working oil port positioned behind the valve and connected with a control cavity of the rotary speed reducer brake, and the oil taking port positioned in front of the valve.

and the energy accumulator is connected to the oil taking port.

In an embodiment of the present application, the swing motor hydraulic circuit includes:

and a pump oil port of the main pump is connected to the valve oil inlet through a first pumping oil path and is connected to the oil taking port through a second pumping oil path.

the oil inlet one-way valve is arranged in the second pumping oil way and allows pressure oil to flow to the oil taking port from the pumping oil port of the main pump and is reversely cut off;

the energy accumulator is connected in the second pumping oil path between the oil taking port and the oil inlet one-way valve.

and the one-way throttle valve is arranged in a connecting oil way between the working oil port and the control cavity of the rotary speed reducer brake.

In an embodiment of the application, the one-way throttle valve and the brake reversing valve form an integrated valve group;

and/or a balance valve group is arranged in a rotary working oil path between the rotary motor and the main reversing valve.

the pump oil port of the brake oil pump is connected to the oil taking port;

in an embodiment of the present application, the brake directional valve and the main directional valve are both electromagnetic directional valves, and the boarding slip hydraulic system includes a hysteresis controller for individually controlling or associating with controlling the brake directional valve and the main directional valve, respectively.

In an embodiment of the present application, the hysteresis controller is configured to:

when the main reversing valve is switched from the working valve position to the stop valve position, the set time is delayed, and then the brake reversing valve is controlled to be switched from the brake release valve position to the brake valve position.

controlling the brake directional control valve to switch from the brake valve position to the brake release valve position before the main directional control valve switches from the cut-off valve position to the working valve position.

In addition, the second aspect of the present application further provides a construction machine, which includes an upper vehicle portion and a lower vehicle portion for walking, and further includes the above upper vehicle slipping hydraulic system, and the turning motor is used for driving the upper vehicle portion to turn.

In the hydraulic system that slips of getting on bus of this application, the brake pressure oil of gyration speed reducer stopper is got before the valve of the main change valve in the gyration motor, perhaps mutually independent with the gyration motor hydraulic circuit, does not influence each other, is different from the valve rear end that the brake pressure oil was got from the main change valve of gyration motor among the prior art, is close to the main pump to it is big to receive the influence such as gyration motor hydraulic circuit, especially its hydraulic valve group trouble. Therefore, the defect of synchronism of rotation and brake release can be avoided, the rotation brake can be independently and conveniently controlled, when the rotation action is stopped, the rotation mechanism can continuously rotate for a certain angle in a sliding mode to eliminate inertia influence, then the brake is carried out, and therefore the operation stability of the vehicle-loading part is better guaranteed.

Additional features and advantages of embodiments of the present application will be described in detail in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the detailed description serve to explain the embodiments of the disclosure, but are not intended to limit the embodiments of the disclosure. In the drawings:

FIG. 1 is a hydraulic schematic diagram of a prior art boarding slip hydraulic system;

FIG. 2 is a hydraulic schematic of a roll-on hydraulic system according to an embodiment of the present application; and

FIG. 3 is a hydraulic schematic of a boarding slip hydraulic system according to another embodiment of the present application.

Description of the reference numerals

1. One-way throttle valve 2 braking reversing valve

3. Energy accumulator 4 oil inlet one-way valve

5. Main pump 6 hydraulic oil tank

7. Main reversing valve 8 balance valve group

9. Rotary motor of rotary speed reducer brake 10

11. Brake oil pump 12 shuttle valve

13. Ball valve

P1 front oil inlet P2 oil taking port

Working fluid port A and oil return port T

L1 first pumping oil path L2 second pumping oil path

Detailed Description

The following detailed description of embodiments of the present application will be made with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present application, are given by way of illustration and explanation only, and are not intended to limit the present application.

The boarding slip hydraulic system and the construction machine according to the present application are described below with reference to the accompanying drawings.

In order to realize high controllability and rotation stability of the rotation operation of the boarding part, the application particularly discloses a boarding slip hydraulic system. Referring to FIG. 2, in one embodiment, the roll-on hydraulic system may include:

a rotary motor hydraulic circuit provided with a rotary motor 10 and a main directional control valve 7 for switching and controlling the rotary motor 10; and

a rotary brake control oil path provided with a rotary speed reducer brake 9 for braking and controlling the rotary motor 10;

wherein the oil intake port P2 of the brake pressure oil in the swing brake control oil passage is provided in parallel with the valve forward oil port P1 of the main directional control valve 7 or is connected to the pressure oil source independently of each other.

It can be seen that, in the embodiment of fig. 2, the brake pressure oil of the rotary reduction gear brake 9 is taken from the valve rear end of the main directional control valve of the rotary motor 10, but taken from the valve front of the main directional control valve of the rotary motor 10, or the two are independent of each other and are not affected, which is significantly different from the hydraulic system of fig. 1; obviously, the closer the oil intake port of the brake pressure oil of the slewing reducer brake 9 is to the main pump 5, the less susceptible it is to a valve group failure or the like. And whether the brake is released or not can be controlled independently, so that the defect of synchronism between rotation and brake release can be overcome, an operator can independently and conveniently operate the rotation brake, the operation is simpler and more convenient, and when the rotation action is stopped, the rotation mechanism can continue to rotate at a certain angle in a sliding manner to eliminate the inertia influence and then brake, so that the operation stability of the vehicle-loading part is better ensured.

As is well known to those skilled in the art, the term "before-valve and after-valve" refers to when the hydraulic valve (i.e., the main directional control valve 7) is operated by the main pump 5, and the pressure oil flows into the valve body side before the valve and flows out of the valve body side after the valve.

Wherein, in order to facilitate the independent control of the rotary braking, a braking reversing valve 2 is arranged in the rotary braking control oil path. The brake reversing valve 2 in fig. 2 comprises a working oil port a located behind the valve and a oil taking port P2 located in front of the valve, which are connected with a control cavity of a rotary speed reducer brake 9. It can be seen that the oil taking port P2 of the brake directional valve 2 is connected with the oil inlet P1 of the main directional valve 7 in parallel. When the brake reversing valve 2 is at the right position shown in the figure, the brake pressure oil of the control cavity of the rotary speed reducer brake 9 returns to the hydraulic oil tank 6 through the rotary brake control oil way, at the moment, the rotary speed reducer brake 9 is closed in a decompression mode, and the speed reducer is in a brake state. When the brake directional valve 2 is controlled to be switched to the left position shown in the figure, the pressure oil in front of the main directional valve 7 can be led to the oil taking port P2 and flows to the rotary speed reducer brake 9 through the brake directional valve 2, so that the speed reducer is in a brake release state.

In order to achieve more reliable brake release and prevent the swing operation from being hindered, the swing brake control oil passage according to the present embodiment further includes:

and the energy accumulator 3 is connected to the oil taking port P2.

At this time, the accumulator 3 serves as a backup pressure source, and when the main directional control valve 7, the motor-pump unit, and the like in the swing motor hydraulic circuit fail, the brake can be released by the pressure oil stored in the accumulator 3.

As shown in fig. 2, in the present embodiment, the swing motor hydraulic circuit includes a main pump 5, the swing motor hydraulic circuit and the swing brake control oil passage share the main pump 5, and a pump oil port of the main pump 5 is connected to the valve-forward oil port P1 through a first pumping oil passage L1 and to the pickup oil port P2 through a second pumping oil passage L2.

As can be seen, the main pump 5 pumps pressure oil through the parallel first and second pumping oil passages L1 and L2 toward the main and brake directional valves 7 and 2, respectively. In order to separate the oil pumping ports of the energy accumulator 3 and the main pump 5, an oil inlet one-way valve 4 is further arranged in the rotary braking control oil path, the oil inlet one-way valve 4 is arranged in the second pumping oil path L2 and allows pressure oil to flow to the oil taking port P2 from the oil pumping port of the main pump 5 and is stopped reversely, at the moment, the energy accumulator 3 is connected in the second pumping oil path L2 between the oil taking port P2 and the oil inlet one-way valve 4, and therefore the pressure oil of the energy accumulator 3 can be prevented from flowing back towards the main pump 5.

Furthermore, a one-way throttle valve 1 can be arranged in the rotary brake control oil path, and the one-way throttle valve 1 is arranged in a connecting oil path between the working oil port A and a control cavity of a rotary speed reducer brake 9. The one-way throttle valve 1 can be formed by a valve bank and can also be disassembled into a parallel connection form of the one-way valve and the throttle valve. Thus, when the brake reversing valve 2 is in the left position, the brake pressure oil of the oil taking port P2 is pumped towards the control cavity of the rotary speed reducer brake 9 through the one-way valve in the one-way throttle valve 1, and when the brake reversing valve 2 is switched to the right position, the pressure oil in the control cavity of the rotary speed reducer brake 9 is throttled and returned through the adjustable throttle valve in the one-way throttle valve 1, so that the speed reducer is switched to the braking state in a slow step mode.

In fig. 2, a balancing valve group 8 is further provided in the swing working oil path between the swing motor 10 and the main directional control valve 7 to hydraulically lock the swing motor 10 when the swing is stopped. In addition, the one-way throttle valve 1 and the brake reversing valve 2 can be independently arranged in series, and can also form an integrated valve group.

Referring to fig. 3, in another embodiment, a swing brake control oil passage includes:

a pump oil port of the brake oil pump 11 is connected to the oil taking port P2;

in this embodiment, the motor-pump unit alone may be used to provide a pressure source for the left-side swing brake control oil passage, i.e., the oil intake port P2 of the swing brake control oil passage and the valve forward oil inlet P1 of the main directional control valve 7 are connected to the pressure oil source independently of each other, so that the swing control and the swing brake control are independent of each other and can be independently operated.

In fig. 2 or fig. 3, the brake directional control valve 2 and the main directional control valve 7 are electromagnetic directional control valves that are easy to control electrically, wherein the brake directional control valve 2 may be a two-position three-way directional control valve, and the main directional control valve 7 may be a three-position four-way directional control valve, but is not limited thereto. On the basis, considering specific operation requirements, before getting on the vehicle to rotate, the brake must be released in advance, after the rotation is stopped, the rotation inertia is waited to stop, and then the brake is carried out, so that the brake is reliable, and the rotation operation is smoother. Therefore, the boarding slip hydraulic system may further include a hysteresis controller for individually controlling or controlling in association the brake directional valve 2 and the main directional valve 7, respectively. The hysteresis controller is electrically connected with a single electromagnet in the brake directional valve 2 and two electromagnets of the main directional valve 7 respectively, so that whether the brake is released or not can be controlled independently, and the forward and reverse rotation of the rotary motor 10 can be controlled independently.

Based on the above-mentioned setting requirements, the hysteresis controller may be configured to: when the main reversing valve 7 is switched from the operating valve position to the cut-off valve position, the set time is delayed, and then the brake reversing valve 2 is controlled to be switched from the brake release valve position (i.e., the left position of the brake reversing valve 2 in fig. 2) to the brake valve position (i.e., the right position of the brake reversing valve 2 in fig. 2).

Because the rotary speed reducer brake 9 is in a normally closed state, the brake reversing valve 2 is normally in a right position, and if and only when the brake reversing valve 2 is switched to a left position, the rotary speed reducer brake 9 is pressed to release braking, therefore, when the rotary action is stopped, the brake reversing valve 2 is controlled by the hysteresis controller to delay for a certain time and then do the reversing action, so that the braking is delayed, the rotary mechanism can rotate by a certain angle in a sliding manner to eliminate inertia influence, and the operation stability of the upper part is ensured.

Additionally, the hysteresis controller may be configured to: before the main directional control valve 7 is switched from the stop valve position to the working valve position, the brake directional control valve 2 is controlled to be switched from the brake valve position to the brake release valve position. That is, the brake must be released in advance before the vehicle is turned around.

On the basis of the above-mentioned boarding sliding-rotating hydraulic system, the application also discloses an engineering machine, which comprises a boarding part, a alighting part for walking and the above-mentioned boarding sliding-rotating hydraulic system, wherein a rotary motor 10 is used for driving the boarding part to rotate. Such a work machine may be, for example, a telescopic boom forklift, an aerial work platform, etc.

Specifically, taking fig. 2 as an example, the working process is described as follows:

a rest state: the brake reversing valve 2 is in a right position when power is lost, and the oil return port T is communicated with the working oil port A. Hydraulic oil in the rotary speed reducer brake 9 flows into the oil return port T through the throttling port of the one-way throttle valve 1 and the working oil port A of the brake reversing valve 2, finally flows into the hydraulic oil tank 6, the rotary speed reducer brake 9 is closed in a decompression mode, and the speed reducer is in a braking state.

Releasing braking: before the upper vehicle rotates, the brake reversing valve 2 needs to be electrified in advance, the valve core is positioned at the left position at the moment, and the oil taking port P2 is communicated with the working oil port A. Pressure oil of a pump oil port of the main pump 5 passes through the oil inlet one-way valve 4, one part of the pressure oil is filled into the energy accumulator 3, the other part of the pressure oil flows to the working oil port A through the oil taking port P2 of the brake reversing valve 2, then enters the rotary speed reducer brake 9 through the one-way valve in the one-way throttle valve 1, and the pressure oil jacks up a brake mechanism of the rotary speed reducer, so that the brake is released. At this time, if the main directional control valve 7 is not energized and is always at the neutral position, the front oil inlet P1 is closed by the pressure oil, and the upper vehicle does not turn.

Getting on the vehicle and turning left and right: after braking is relieved, if the left electromagnet of the main reversing valve 7 is electrified, the valve core is in a left position, the front oil inlet P1 is communicated with the working oil inlet B1, the oil return port T1 is communicated with the working oil inlet B2, and the rotary motor 10 rotates forwards to drive the speed reducer to drive the upper vehicle to rotate leftwards. If the right electromagnet of the main reversing valve 7 is electrified, the front oil inlet P1 is communicated with the working oil inlet B2, the oil return port T1 is communicated with the working oil inlet B1, and the rotary motor 10 rotates reversely to drive the speed reducer to rotate the upper vehicle to the right.

Emergency overhaul: when the rotary motor 10, the balance valve group 8 or the main reversing valve 7 fails, the upper vehicle cannot actively rotate by the rotary motor 10. If the user wants to turn the upper part of the vehicle, the brake is released and the upper part of the vehicle is pulled by external force to turn. At this time, the main pump 5 may not be started normally, and after the brake directional valve 2 is powered on, the pressure oil stored in the accumulator 3 enters the rotary speed reducer brake 9 through the brake directional valve 2 via the one-way throttle valve 1, so as to release the braking.

In summary, compared with the prior art, the hydraulic system for the sliding rotation of the upper vehicle has the advantages that the oil taking port P2 of the rotary braking control oil way is connected in front of the main reversing valve 7, the energy accumulator 3 is additionally arranged, braking can be relieved in advance before the upper vehicle rotates, whether the braking is relieved or not can be controlled independently, when the rotary action is stopped, the upper vehicle can slide by a certain angle to eliminate inertia influence, and the stability of operation of the upper vehicle part is guaranteed. Furthermore, the oil taking port of the swing brake control oil path is designed before the main directional control valve 7, and when the main directional control valve 7 and the motor pump set thereof have faults, the brake can still be released through the hydraulic oil stored in the accumulator 3.

In the description of the present application, it is to be understood that the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and encompass, for example, both fixed and removable connections or integral parts thereof; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," 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 application. In this specification, the schematic representations of the terms used above are not necessarily intended to 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. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.

While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are exemplary and should not be construed as limiting the present application and that changes, modifications, substitutions and alterations in the above embodiments may be made by those of ordinary skill in the art within the scope of the present application.

Claims

1. A roll-on hydraulic system, comprising:

a rotary motor hydraulic circuit provided with a rotary motor (10) and a main directional control valve (7) for switching and controlling the rotary motor (10); and

a rotary brake control oil path provided with a rotary speed reducer brake (9) for brake control of the rotary motor (10);

wherein an oil taking port (P2) of the braking pressure oil in the rotary braking control oil path and a valve front oil inlet (P1) of the main reversing valve (7) are arranged in parallel or are independently connected with a pressure oil source.

2. The roll-on hydraulic system of claim 1, wherein the swing brake control circuit comprises:

the brake reversing valve (2) comprises a working oil port (A) which is connected with a control cavity of the rotary speed reducer brake (9) and is positioned behind the valve, and an oil taking port (P2) which is positioned in front of the valve.

3. The roll-on hydraulic system of claim 2, wherein the swing brake control circuit comprises:

an accumulator (3) connected to the oil intake (P2).

4. A roll-on hydraulic system as claimed in claim 3 wherein the swing motor hydraulic circuit comprises:

a main pump (5), wherein a pump oil port of the main pump (5) is connected to the valve oil inlet (P1) through a first pumping oil path (L1) and is connected to the oil outlet (P2) through a second pumping oil path (L2).

5. The roll-on hydraulic system of claim 4, wherein the swing brake control circuit comprises:

the oil inlet one-way valve (4) is arranged in the second pumping oil way (L2) and allows pressure oil to flow to the oil taking port (P2) from a pump oil port of the main pump (5) and is cut off reversely;

the energy accumulator (3) is connected in the second pumping oil path (L2) between the oil taking port (P2) and the oil inlet one-way valve (4).

6. The roll-on hydraulic system of claim 2 wherein the swing brake control circuit comprises:

and the one-way throttle valve (1) is arranged in a connecting oil path between the working oil port (A) and the control cavity of the rotary speed reducer brake (9).

7. The roll-on hydraulic system according to claim 6, characterized in that the one-way throttle valve (1) and the brake directional control valve (2) constitute an integrated valve set;

and/or a balance valve group (8) is arranged in a rotary working oil path between the rotary motor (10) and the main reversing valve (7).

8. The roll-on hydraulic system of claim 2, wherein the swing brake control circuit comprises:

and a pump oil port of the brake oil pump (11) is connected to the oil taking port (P2).

9. A boarding slip hydraulic system according to any one of claims 2-8, characterized in that both the brake directional valve (2) and the main directional valve (7) are electromagnetic directional valves and the boarding slip hydraulic system comprises a hysteresis controller for controlling the brake directional valve (2) and the main directional valve (7) individually or in association, respectively.

10. The roll-on hydraulic system of claim 9, wherein the hysteresis controller is configured to:

when the main reversing valve (7) is switched from the working valve position to the stop valve position, the set time is delayed, and then the brake reversing valve (2) is controlled to be switched from the brake release valve position to the brake valve position.

11. The roll-on hydraulic system of claim 9, wherein the hysteresis controller is configured to:

-controlling the switching of the brake directional control valve (2) from the brake position to the brake release position before the switching of the main directional control valve (7) from the stop position to the service position.

12. A working machine comprising a boarding part and a disembarking part for walking, characterized in that the working machine comprises a boarding slip hydraulic system according to any one of claims 1 to 11, and the swing motor (10) is used for driving the boarding part to swing.