CN114810712A - Hydraulic control loop and engineering machinery hydraulic system - Google Patents
Hydraulic control loop and engineering machinery hydraulic system Download PDFInfo
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- CN114810712A CN114810712A CN202210410064.3A CN202210410064A CN114810712A CN 114810712 A CN114810712 A CN 114810712A CN 202210410064 A CN202210410064 A CN 202210410064A CN 114810712 A CN114810712 A CN 114810712A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/0401—Valve members; Fluid interconnections therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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Abstract
The invention relates to a hydraulic system and discloses a hydraulic control circuit which comprises a first control valve, a second control valve, a first priority valve, a second priority valve, a third priority valve, a fourth priority valve and a regeneration valve, wherein the first control valve, the second control valve, the first priority valve, the second priority valve, the third priority valve and the fourth priority valve are arranged on the first control valve; the first control valve and the second control valve are closed center reversing valves, the first priority valve and the second priority valve are respectively connected between the first oil supply oil path and the first control valve, the first control valve can be used for shunting and converging oil supply and controlling the oil supply amount, the third priority valve and the fourth priority valve are respectively connected between the first oil supply oil path and the second control valve, the second control valve can be used for shunting and converging oil supply and controlling the oil supply amount, the regeneration valve is connected between the first control valve and the oil supply oil path, and the hydraulic oil returned by the hydraulic actuating mechanism connected with the first control valve can be conveyed to the oil supply oil path for reuse. The invention also discloses a hydraulic system of the engineering machinery.
Description
Technical Field
The present invention relates to hydraulic control systems, and in particular to a hydraulic control circuit. In addition, the invention also relates to an engineering machinery hydraulic system.
Background
The engineering machinery is driven by a hydraulic system, and the hydraulic system has the advantages of large driving force, good load self-adaptive capacity, stable driving and the like. With the wide popularization and application of engineering machinery, the working efficiency, the convenience in operation and the energy conservation become main attention objects of various host manufacturing companies, research and development institutions and customers.
A hydraulic system of a construction machine generally controls the flow direction of hydraulic oil of a hydraulic actuator that drives different operations of the construction machine by a plurality of control valves, respectively, to form the different operations of the construction machine. In order to reduce the mutual influence of the hydraulic oil supply between different hydraulic actuators, two oil supply paths are usually provided to supply hydraulic oil to a hydraulic system, and the confluence oil supply of the two oil supply paths can be realized through a confluence valve, so that the movement speed of a specific hydraulic actuator is increased, and the working efficiency is improved. The hydraulic oil with higher pressure recovered by the specific hydraulic actuating mechanism can be sent to other hydraulic actuating mechanisms for reutilization through the regeneration valve, so that the reutilization of energy in the recovered hydraulic oil is realized, and the energy waste is reduced.
In a hydraulic system of the existing engineering machinery, a hydraulic loop is mostly of an open center structure, and when each control valve is in a middle position, an oil supply oil way is communicated with an oil way inside each control valve, so that the leakage amount of oil inside each control valve is large, and the energy loss of the middle position is large. The existing hydraulic control circuit is generally provided with a priority valve for controlling preferential oil supply of different hydraulic actuating mechanisms, and a confluence valve for controlling confluence oil supply of a specific hydraulic actuating mechanism, so that a plurality of hydraulic elements are provided, and the hydraulic control circuit is more complicated.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a hydraulic control loop which is simple in oil path and good in control performance and energy-saving performance.
The invention further aims to solve the technical problem of providing an engineering machinery hydraulic system which is simple in hydraulic control oil circuit, convenient to operate and control and good in energy saving performance.
In order to solve the above technical problem, an aspect of the present invention provides a hydraulic control circuit including a first control valve, a second control valve, a first priority valve, a second priority valve, a third priority valve, a fourth priority valve, and a regeneration valve; the first control valve and the second control valve are both closed center reversing valves, the output oil port of the first control valve is respectively connected with the first working oil path of the first control valve and the second working oil path of the first control valve of the hydraulic control loop, the input oil port of the first control valve is respectively connected with the output oil port of the first priority valve and the second priority valve, and the return oil path of the hydraulic control loop, the input oil ports of the first priority valve and the second priority valve are respectively connected with the first oil supply path and the second oil supply path of the hydraulic control loop, the output oil port of the second control valve is respectively connected with the first working oil path of the second control valve and the second working oil path of the second control valve of the hydraulic control loop, the input oil port of the second control valve is respectively connected with the output oil port of the third priority valve and the fourth priority valve, and the return oil path, and the input oil ports of the third priority valve and the fourth priority valve are respectively connected with the first oil supply path and the second oil supply path And the regeneration valve is connected between an output oil port of the first control valve and the first oil supply oil path or the second oil supply oil path.
Preferably, the first priority valve, the second priority valve, the third priority valve and the fourth priority valve are two-position two-way flow control valves, and when the two-position two-way flow control valve is located at the first valve position, an oil inlet of the two-position two-way valve is communicated with an oil outlet in a one-way mode and can control the flow rate of the two-position two-way valve; and when the two-position two-way flow control valve is positioned at the second valve position, the oil inlet and the oil outlet of the two-position two-way valve are disconnected. In the preferred technical scheme, each priority valve can control the on-off of the oil path between the oil inlet and the oil outlet and the flow rate, realize the control of confluence and separate oil supply of the first oil supply path and the second oil supply path and realize the control of preferential oil supply of different hydraulic actuating mechanisms.
Preferably, the first working oil path of the first control valve is connected with a rodless cavity of the working hydraulic cylinder, the second working oil path of the first control valve is connected with a rod cavity of the working hydraulic cylinder, an oil inlet of the regeneration valve is connected with the first working oil path of the first control valve, and an oil outlet of the regeneration valve is connected with the second oil supply path. Through the preferred technical scheme, the first control valve can be switched into the first oil supply oil way to be communicated with the second working oil way of the first control valve, high-pressure hydraulic oil enters the rod cavity of the working hydraulic cylinder, meanwhile, the regeneration valve is communicated, and hydraulic oil with higher pressure in the rod-free cavity of the working hydraulic cylinder can enter the second oil supply oil way through the first working oil way of the first control valve and the regeneration valve to supply oil for other execution mechanisms, so that the hydraulic oil with higher pressure can be recycled.
Further preferably, the regeneration valve is a two-position two-way valve, and when the regeneration valve is located at the first valve position, the oil inlet of the regeneration valve is communicated with the oil outlet in a one-way mode; and when the regeneration valve is positioned at the second valve position, the oil inlet of the regeneration valve is disconnected with the oil outlet. Through this preferred technical scheme, can realize the regeneration of hydraulic oil in the first working fluid circuit of first control valve when, prevent that the hydraulic oil pressure in the second oil feed oil circuit from passing through the rodless chamber of the working hydraulic cylinder that the regeneration valve got into when higher, influencing the normal work of first pneumatic cylinder.
Further, the first control valve and the second control valve are both three-position five-way reversing valves. In the preferred technical scheme, the three-position five-way valve is used, a parallel control valve combination is formed by matching a simple control valve structure and a priority valve, the mutual influence among different hydraulic actuating mechanisms is reduced, the independent or composite action of a plurality of actuating mechanisms is convenient to realize, the structure of a hydraulic control loop is simplified, and the maintenance and the repair of the hydraulic control loop are convenient.
Preferably, the first control valve and the second control valve are both in an O-type neutral position function. Through this preferred technical scheme, the valve internal leakage of first control valve and second control valve is littleer, and the pressurize performance is better, can make the pneumatic cylinder stop in optional position.
Specifically, the first control valve comprises an oil inlet, a first oil return port, a second oil return port, a first oil output port and a second oil output port, the oil inlet is connected with the output oil ports of the first priority valve and the second priority valve, the first oil return port and the second oil return port are respectively connected with the oil return circuit, the first output oil port is connected with the first working oil path of the first control valve, the second output oil port is connected with the second working oil path of the first control valve, when the first control valve is positioned at a first valve position, the oil inlet is communicated with the first oil outlet, the second oil return port is communicated with the second oil outlet port, when the first control valve is positioned at a second valve position, the oil inlet is communicated with the second oil outlet, and the first oil return port is communicated with the first oil outlet through a throttling port. Through this preferred technical scheme, can utilize the higher hydraulic oil of the pressure of working hydraulic cylinder backward flow better, improve the regeneration effect of hydraulic oil.
Preferably, a check valve is arranged at an oil inlet of the second oil supply path. In this preferred embodiment, the check valve is provided so that the high-pressure hydraulic oil flowing in through the regeneration valve can be returned from the source of the second oil supply passage.
Preferably, the hydraulic control circuit of the present invention further includes a third control valve, a fifth priority valve and a sixth priority valve, the third control valve is an O-type neutral position function three-position five-way directional valve, an output oil port of the third control valve is respectively connected to a first working oil path of the third control valve and a second working oil path of the third control valve of the hydraulic control circuit, an input oil port is respectively connected to an output oil port of the fifth priority valve and an output oil port of the sixth priority valve, and the oil return path, and an input oil port of the fifth priority valve and an input oil port of the sixth priority valve are respectively connected to a first oil supply path and a second oil supply path. Through the optimal technical scheme, more hydraulic actuating mechanisms can be driven and controlled, the influence among different hydraulic actuating mechanisms is small, and the high-efficiency and coordinated work among different hydraulic actuating mechanisms can be ensured.
The second aspect of the invention provides a hydraulic system of engineering machinery, which comprises the hydraulic control circuit provided by the first aspect of the invention.
According to the hydraulic control loop, each control valve adopts a closed center reversing valve, so that the neutral energy loss of the control valve is smaller; the input oil ports of the control valves are respectively connected to the first oil supply oil path and the second oil supply oil path through the two priority valves, so that the control valves can be conveniently switched to supply oil from the first oil supply oil path and the second oil supply oil path or supply oil by confluence of the first oil supply oil path and the second oil supply oil path, the oil supply pertinence of the hydraulic actuating mechanism is stronger, the working efficiency of the actuating mechanism is higher, and the energy utilization rate of hydraulic oil is also higher. Meanwhile, the oil supply amount of different hydraulic actuating mechanisms can be controlled through the priority valve, the priority oil supply of a specific hydraulic actuating mechanism is realized, the oil supply balance among the different hydraulic actuating mechanisms is realized, and the coordination of the actions of the different actuating mechanisms is ensured. The hydraulic control loop has simpler structure and better performance. The arrangement of the regeneration valve can convey the high-pressure hydraulic oil which flows back from the specific hydraulic actuating mechanism to another oil supply oil way to be used by other multiple hydraulic actuating mechanisms, so that the regeneration and the utilization of the hydraulic oil are realized, the energy resource is fully utilized, and the waste of energy is reduced.
The engineering machinery hydraulic system provided by the invention uses the hydraulic control circuit provided by the invention, and has the advantages.
Other technical features and advantages of the present invention will be further described in the following detailed description.
Drawings
FIG. 1 is a schematic diagram of one embodiment of a hydraulic control circuit of the present invention.
Description of the reference numerals
1 first control valve 2 second control valve
31 first priority valve 32 second priority valve
33 third priority valve 34 fourth priority valve
35 fifth priority valve 36 sixth priority valve
4 regeneration valve 5 one-way valve
6 third control valve 7 working hydraulic cylinder
A first output oil port and B second output oil port
A1 first control valve first working fluid passage B1 first control valve second working fluid passage
A2 second control valve first working fluid passage B2 second control valve second working fluid passage
A3 third control valve first working fluid passage B3 third control valve second working fluid passage
P1 first oil supply path P2 second oil supply path
Pa1 first control terminal Pb1 second control terminal
T oil return oil way
Detailed Description
In the present invention, unless otherwise specified, the terms of orientation or positional relationship as indicated by "upper and lower" used herein are the ones in which the described device or component is actually used.
The terms "first", "second", "third", "fourth", "fifth", "sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit indication of the number of technical features indicated, and therefore, the features defined as "first", "second", "third", "fourth", "fifth", "sixth" may explicitly or implicitly include one or more of the features described.
In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted" and "connected" are to be interpreted broadly, for example, the term "connected" may be a fixed connection, a detachable connection, or an integral connection; either directly or indirectly through intervening media, either internally or in any combination thereof. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, and it is to be understood that the detailed description is provided for purposes of illustration and explanation and is not intended to limit the scope of the invention.
As shown in fig. 1, one embodiment of the hydraulic control circuit of the present invention includes a first control valve 1, a second control valve 2, a first priority valve 31, a second priority valve 32, a third priority valve 33, a fourth priority valve 34, and a regeneration valve 4. The first control valve 1 and the second control valve 2 are both closed center reversing valves, and the closed center reversing valve in the invention means that when a valve core of the reversing valve is in a middle position, an oil passage in the reversing valve and an oil inlet of the reversing valve are in a cut-off state. Therefore, when the reversing valve is positioned at the middle position, high-pressure hydraulic oil in the oil supply oil path connected with the input oil port cannot enter the oil duct inside the reversing valve, leakage of the hydraulic oil through gaps of the oil duct inside the reversing valve is reduced, and middle position energy loss of the reversing valve can be effectively reduced. The output oil port of the first control valve 1 is connected to a first control valve first working oil path a1 and a first control valve second working oil path B1 for connecting to a hydraulic actuator, respectively, and the flow direction of hydraulic oil in the first control valve first working oil path a1 and the first control valve second working oil path B1 can be switched by switching the valve position of the first control valve 1. The hydraulic control circuit is provided therein with a first oil supply path P1 and a second oil supply path P2 connected to different hydraulic oil supply sources, and an oil return path T connected to a hydraulic oil tank. The input ports of the first priority valve 31 and the second priority valve 32 are respectively connected with the first oil supply path P1 and the second oil supply path P2, the output ports of the first priority valve 31 and the second priority valve 32 are connected with each other, the input port of the first control valve is respectively connected with the output port of the first priority valve 31 and the second priority valve 32, which are connected with each other, and the oil return path T. The priority valve is a hydraulic valve capable of controlling opening and closing of an oil path and controlling the flow rate of the oil path, the first priority valve 31 is controlled to be opened, so that hydraulic oil can be supplied to the first control valve 1 through the first oil supply path P1, the second priority valve 32 is controlled to be opened, so that hydraulic oil can be supplied to the first control valve 1 through the second oil supply path P2, the first priority valve 31 and the second control valve 32 are controlled to be opened simultaneously, so that oil can be supplied to the first control valve 1 through the first oil supply path P1 and the second oil supply path P2, the output power and the movement speed of a hydraulic actuator connected with the first control valve first working oil path a1 and the first control valve second working oil path B1 can be controlled according to work requirements, and the work efficiency of the hydraulic actuator is improved; by controlling the flow rate of the first priority valve 31 and/or the second priority valve 32, the flow rate of the hydraulic oil supplied to the first control valve from the first oil supply line and/or the second oil supply line can be controlled, and priority oil supply to the specific hydraulic actuator can be realized. Similarly, the input ports of the third priority valve 33 and the fourth priority valve 34 are respectively connected with the first oil supply path P1 and the second oil supply path P2, the output ports of the third priority valve 33 and the fourth priority valve 34 are connected with each other, the input port of the second control valve 2 is respectively connected with the output port of the third priority valve 33 and the fourth priority valve 34, and the oil return path T, and the output port of the second control valve 2 is respectively connected with the first working oil path a2 and the second working oil path B2 of the second control valve for connecting with the hydraulic actuator, and is respectively connected with the first oil supply path P1 and the second oil supply path P2. By switching the valve positions of the second control valve 2, the oil supply direction of the hydraulic actuator connected to the second control valve first hydraulic fluid passage a2 and the second control valve second hydraulic fluid passage B2 can be switched, and the operation of the hydraulic actuator can be controlled. By controlling the opening and closing of the third priority valve 33 and the fourth priority valve 34 and the flow rate, the flow rate distribution of the hydraulic oil between the first control valve 1 and the second control valve 2 is controlled by controlling the branching and merging of the first oil supply path P1 and the second oil supply path P2 to the second control valve 2 and controlling the flow rate of the oil supplied to the second control valve 2, thereby ensuring the coordination of different operations of the construction machine. The regeneration valve 4 is connected between an output oil port of the first control valve 1 and the first oil supply oil path P1 or the second oil supply oil path P2, the regeneration valve 4 may be various hydraulic valves capable of controlling the on-off of the oil paths, the regeneration valve 4 is opened, when the first oil supply oil path P1 supplies oil to the first control valve 1, the return oil with higher pressure of the hydraulic actuator connected with the first control valve 1 is conveyed to the second oil supply oil path P2, or when the second oil supply oil path P2 supplies oil to the first control valve 1, the return oil with higher pressure of the hydraulic actuator connected with the first control valve 1 is conveyed to the first oil supply oil path P1, so that the reuse, namely flow regeneration, of the recovered hydraulic oil with higher pressure of the hydraulic actuator is realized, the energy resources stored in the hydraulic oil are fully utilized, and the energy waste is reduced.
In some embodiments of the hydraulic control circuit of the present invention, as shown in fig. 1, each of the first priority valve 31, the second priority valve 32, the third priority valve 33, and the fourth priority valve 34 is a two-position two-way flow control valve, and the two-position two-way flow control valve has two valve positions, and along with movement of a valve element of the two-position two-way flow control valve between the two valve positions, on/off of an oil path between an oil inlet and an oil outlet of the two-position two-way flow control valve can be controlled, and a flow rate of the oil path can be controlled. A one-way valve structure is further arranged in a valve body of the two-position two-way flow control valve, when the valve core is located at the first valve position, the two-position two-way valve is communicated in one way from the oil inlet to the oil outlet, and the opening degree of the valve port is changed along with the movement of the valve core at the first valve position, so that the flow from the oil inlet to the oil outlet can be controlled; when the valve core of the two-position two-way flow control valve is positioned at the second valve position, the valve port of the two-position two-way valve is closed, and the oil path between the oil inlet and the oil outlet is disconnected.
In some embodiments of the hydraulic control circuit of the present invention, as shown in fig. 1, a first control valve first working oil passage a1 and a first control valve second working oil passage B1 are connected to the working hydraulic cylinder 7, wherein the first control valve first working oil passage a1 is connected to a rodless chamber of the working hydraulic cylinder 7, the first control valve second working oil passage B1 is connected to a rod chamber of the working hydraulic cylinder 7, when the first control valve first working oil passage a1 is supplied with oil and the first control valve second working oil passage B1 is returned with oil, a piston rod of the working hydraulic cylinder 7 is extended to normally push the power mechanism of the construction machine to be extended to output power against the working load, when the first control valve second working oil passage B1 is supplied with oil and the first control valve first working oil passage a1 is returned with oil, a piston rod of the working hydraulic cylinder 7 is retracted to retract the power mechanism of the construction machine, and the load of the power mechanism of the construction machine is normally small, even if the work load acts on the power mechanism, the assist power mechanism retracts, and therefore the pressure difference of the hydraulic oil in the working cylinder 7 is small, and the pressure of the hydraulic oil that flows back through the first working oil passage a1 of the first control valve is high. An oil inlet of the regeneration valve 4 is connected with a first control valve first working oil path A1, an oil outlet of the regeneration valve 4 is connected with a second oil supply path P2, the regeneration valve 4 is controlled to be opened, when the pressure of hydraulic oil in the first control valve first working oil path A1 is greater than that of the second oil supply path P2, hydraulic oil with higher pressure flowing back from a rodless cavity of the working hydraulic cylinder 7 can flow into the second oil supply path P2 through the first control valve first working oil path A1 and the regeneration valve 7 to be recycled, and therefore recycling of the returned hydraulic oil is achieved.
In some embodiments of the hydraulic control circuit of the present invention, as shown in fig. 1, the regeneration valve 4 is a two-position two-way valve, and a one-way valve structure is disposed in the two-position two-way valve, when the regeneration valve 4 is located at the first valve position, the regeneration valve 4 is unidirectionally conducted from the oil inlet to the oil outlet, and when the regeneration valve 4 is located at the second valve position, the oil path between the oil inlet and the oil outlet of the regeneration valve 4 is disconnected. In this way, whether the hydraulic oil that has returned to the rodless chamber of the hydraulic cylinder 7 is recycled can be controlled by controlling the valve position of the regeneration valve 4, and when the pressure of the second oil supply passage P2 is greater than the pressure of the first control valve first hydraulic passage a1, the hydraulic oil in the second oil supply passage P2 can be prevented from entering the first control valve first hydraulic passage a1, which affects the normal operation of the hydraulic cylinder 7.
As a specific embodiment of the hydraulic control circuit of the present invention, as shown in fig. 1, the first control valve 1 and the second control valve 2 are both three-position five-way selector valves. Compared with a three-position six-way reversing valve commonly used in the field, the three-position five-way reversing valve has a simpler valve body structure, and is matched with a priority valve to form a parallel oil supply circuit, so that the hydraulic control circuit is simpler in structure and more convenient to maintain.
In some embodiments of the hydraulic control circuit of the present invention, as shown in fig. 1, the first control valve 1 and the second control valve 2 are both O-type neutral position function switching valves. When the O-shaped middle position function reversing valve is positioned at the middle position, all the oil ports are completely closed, and the hydraulic actuating mechanism controlled by the O-shaped middle position function reversing valve can stop at any position. And when the control valve is positioned in the middle position, the hydraulic oil path connected with the output oil port is not unloaded, when the control valve is reversed, the hydraulic cylinder is started stably, and the reversing position precision is high.
As a specific embodiment of the hydraulic control circuit of the present invention, as shown in fig. 1, the first control valve 1 includes three input oil ports, which are an oil inlet P, a first oil return port T1 and a second oil return port T2, and two output oil ports, which are a first output oil port a and a second output oil port B, respectively. The output oil ports of the first priority valve 31 and the second priority valve 32 are connected with each other and then connected to the oil inlet P, the first oil return port T1 and the second oil return port T2 are respectively connected with the oil return path T, the first output oil port a is connected with the first working oil path a1 of the first control valve, and the second output oil port B is connected with the second working oil path B1 of the first control valve. When pressure oil is introduced into the first control end Pa1, the first control valve 1 is located at a first valve position, the oil inlet P is communicated with the first output oil port a, and the second oil return port T2 is communicated with the second output oil port B, at this time, hydraulic oil in the first oil supply path P1 enters the oil inlet P through the first priority valve 31, and/or hydraulic oil in the second oil supply path P2 enters the first working oil path a1 of the first control valve through the second priority valve 32, and flows into the first working oil path a1 of the first control valve through the first output oil port a. At this time, the regeneration valve 4 is switched to the second valve position to be in a closed state, hydraulic oil enters a rodless cavity of the working hydraulic cylinder 7, a piston rod of the working hydraulic cylinder 7 is pushed to extend out, and a power mechanism of the engineering machinery is driven to act. Meanwhile, the hydraulic oil in the rod cavity of the working hydraulic cylinder 7 flows back to the oil return path T through the first control valve second working oil path B1, the second output oil port B, and the second oil return port T2, and flows back to the hydraulic oil tank of the hydraulic system through the oil return path T. When pressure oil is introduced into the second control end Pb1, the first control valve 1 is in the second valve position, the oil inlet P is communicated with the second output oil port B, the first oil return port T1 is communicated with the first output oil port a, and when the first control valve 1 is in the second valve position, a throttle is arranged on a valve core passage between the first output oil port a and the first oil return port T1, at this time, hydraulic oil in the first oil supply passage P1 enters the oil inlet P through the first priority valve 31, and/or hydraulic oil in the second oil supply passage P2 enters the oil inlet P through the second priority valve 32, and enters the rod cavity of the working hydraulic cylinder 7 through the second output oil port B, so that the piston rod of the working hydraulic cylinder 7 is pushed to retract, and the power mechanism of the engineering machinery is driven to return. Meanwhile, the hydraulic oil in the rodless cavity of the working hydraulic cylinder 7 flows into the first working oil path a1 of the first control valve, when the hydraulic oil in the rodless cavity of the working hydraulic cylinder 7 needs to be recycled, the regeneration valve 4 is switched to the first valve position to be in an open state, at this time, if the pressure of the hydraulic oil in the first working oil path a1 of the first control valve is greater than the pressure of the hydraulic oil in the second oil supply oil path P2, part of the hydraulic oil enters the second oil supply oil path P2 through a one-way communication structure inside the regeneration valve 4, and the recycling of the returned hydraulic oil is realized; and the other part of the hydraulic oil flows back to the oil return oil path T through the first output oil port A and the second oil return port T2 and flows back to the hydraulic oil tank of the hydraulic system through the oil return oil path T. And if the pressure of the hydraulic oil in the first working oil path a1 of the first control valve is lower than the pressure of the hydraulic oil in the second oil supply oil path P2, the hydraulic oil cannot pass through the one-way communication structure inside the regeneration valve, and the hydraulic oil all flows back to the oil return path T through the first output oil port a and the second oil return port T2. The arrangement of the orifice can increase the resistance of the hydraulic oil flowing from the first output oil port a to the second oil return port T2, and prevent the pressure of the hydraulic oil in the first working oil passage a1 of the first control valve from dropping too quickly.
In one embodiment of the hydraulic control circuit of the invention, as shown in fig. 1, a check valve 5 is provided at the oil inlet of the second oil supply passage P2. The check valve 5 is provided so that when the hydraulic pump supplying the oil to the second oil supply passage P2 is in idle operation or low-speed operation, the regenerated hydraulic oil flows to the hydraulic pump, and the operating resistance of the hydraulic pump is increased.
In some embodiments of the hydraulic control circuit of the present invention, as shown in fig. 1, the hydraulic control circuit of the present invention further includes a third control valve 6, a fifth priority valve 35, and a sixth priority valve 36. The input oil ports of the fifth priority valve 35 and the sixth priority valve 36 are respectively connected with a first oil supply oil path P1 and a second oil supply oil path P2, the output oil ports of the fifth priority valve 35 and the sixth priority valve 36 are mutually connected, the third control valve 6 is an O-type middle-position function three-position five-way reversing valve, and the two output oil ports of the third control valve 6 are respectively connected with a third control valve first working oil path A3 and a third control valve second working oil path B3 of a hydraulic control loop; the three input ports of the third control valve 6 are respectively connected with the output ports of the fifth priority valve 35 and the sixth priority valve 36, which are connected with each other, and the oil return path T. By controlling the opening and closing of the fifth priority valve 35 and the sixth priority valve 36, it is possible to control whether the oil is supplied to the third control valve 6 through the first oil supply passage P1, supplied to the third control valve 6 through the second oil supply passage P2, or supplied to the third control valve 6 through the first oil supply passage P1 and the second oil supply passage P2, which are merged. The flow rates of the fifth priority valve 35 and the sixth priority valve 36 and the supply flow rate of the third control valve 6 are controlled, and the priority supply of a specific control valve is realized in cooperation with other priority valves. By switching the valve positions of the third control valve 6, the oil supply/return directions of the third control valve 6 through the third control valve first hydraulic fluid passage a3 and the third control valve second hydraulic fluid passage B3 can be switched.
The engineering machinery hydraulic system provided by the invention uses the hydraulic control loop of any embodiment of the invention, realizes independent control of flow-dividing and flow-converging oil supply of each working oil path through a simpler structure, can realize flexible distribution of oil supply quantity of different working mechanisms, realizes preferential oil supply of a specific working mechanism, and ensures coordination of different actions of the engineering machinery. And the hydraulic oil of the designated hydraulic actuating mechanism can be recycled, the energy in the hydraulic oil is fully utilized, and the energy waste is reduced.
In the description of the present invention, reference to the description of "one embodiment," "some embodiments," "a specific implementation," 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 present invention. In the present disclosure, 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 preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, simple modifications may be made to the technical solution of the invention, including combinations of the individual specific technical features in any suitable manner. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.
Claims (10)
1. A hydraulic control circuit, characterized by comprising a first control valve (1), a second control valve (2), a first priority valve (31), a second priority valve (32), a third priority valve (33), a fourth priority valve (34), and a regeneration valve (4); the first control valve (1) and the second control valve (2) are both closed center reversing valves, the output oil port of the first control valve (1) is respectively connected with a first control valve first working oil path (A1) and a first control valve second working oil path (B1) of the hydraulic control loop, the input oil port is respectively connected with the output oil port of the first priority valve (31) and the second priority valve (32) and the oil return oil path (T) of the hydraulic control loop, the input oil ports of the first priority valve (31) and the second priority valve (32) are respectively connected with a first oil supply path (P1) and a second oil supply path (P2) of the hydraulic control loop, the output oil port of the second control valve (2) is respectively connected with a second control valve first working oil path (A2) and a second control valve second working oil path (B2) of the hydraulic control loop, the oil inlet ports of the third priority valve (33) and the fourth priority valve (34) are respectively connected with the oil outlet ports of the third priority valve (33) and the fourth priority valve (34) and the oil return path (T), the oil inlet ports of the third priority valve (33) and the fourth priority valve (34) are respectively connected with a first oil supply path (P1) and a second oil supply path (P2), and the regeneration valve (4) is connected between the oil outlet port of the first control valve (1) and the first oil supply path (P1) or the second oil supply path (P2).
2. The hydraulic control circuit of claim 1, wherein the first priority valve (31), the second priority valve (32), the third priority valve (33) and the fourth priority valve (34) are two-position and two-way flow control valves, and when the two-position and two-way flow control valves are located at the first valve position, the oil inlets and the oil outlets of the two-position and two-way valves are communicated in a one-way mode, and the flow rates of the two-position and two-way valves can be controlled; and when the two-position two-way flow control valve is positioned at the second valve position, the oil inlet and the oil outlet of the two-position two-way valve are disconnected.
3. The hydraulic control circuit according to claim 1, characterized in that the first control valve first working fluid passage (a1) is adapted to being connected to a rodless chamber of a working hydraulic cylinder, the first control valve second working fluid passage (B1) is adapted to being connected to a rod chamber of a working hydraulic cylinder, the oil inlet of the regeneration valve (4) is connected to the first control valve first working fluid passage (a1), and the oil outlet of the regeneration valve (4) is connected to the second oil supply fluid passage (P2).
4. The hydraulic control circuit of claim 3, wherein the regeneration valve (4) is a two-position two-way valve, and when the regeneration valve (4) is in the first valve position, the oil inlet of the regeneration valve (4) is in one-way communication with the oil outlet; and when the regeneration valve (4) is located at the second valve position, the oil inlet of the regeneration valve (4) is disconnected with the oil outlet.
5. The hydraulic control circuit according to claim 4, characterized in that the first control valve (1) and the second control valve (2) are both three-position, five-way reversing valves.
6. The hydraulic control circuit according to claim 5, characterized in that the first control valve (1) and the second control valve (2) are both O-type neutral function.
7. The hydraulic control circuit according to claim 6, wherein the first control valve (1) includes an oil inlet (P), a first oil return port (T1), a second oil return port (T2), a first oil outlet (A) and a second oil outlet (B), the oil inlet (P) is connected to the oil outlet of the first priority valve (31) and the second priority valve (32), the first oil return port (T1) and the second oil return port (T2) are respectively connected to the oil return path (T), the first oil outlet (A) is connected to the first working oil path (A1) of the first control valve, the second oil outlet (B) is connected to the second working oil path (B1) of the first control valve, when the first control valve (1) is at the first valve position, the oil inlet (P) is connected to the first oil outlet (A), the second oil return port (T2) is communicated with the second oil outlet (B), when the first control valve (1) is in the second valve position, the oil inlet (P) is communicated with the second oil outlet (B), and the first oil return port (T1) is communicated with the first oil outlet (A) through a throttling port.
8. The hydraulic control circuit according to claim 3, wherein a check valve (5) is provided at an oil inlet of the second oil supply passage (P2).
9. The hydraulic control circuit according to any one of claims 1 to 8, further comprising a third control valve (6), a fifth priority valve (35) and a sixth priority valve (36), wherein the third control valve (6) is an O-type middle position function three-position five-way reversing valve, the output oil ports of the third control valve (6) are respectively connected with a third control valve first working oil path (A3) and a third control valve second working oil path (B3) of the hydraulic control circuit, the input oil ports are respectively connected with the output oil ports of the fifth priority valve (35) and the sixth priority valve (36) and the oil return path (T), and the input oil ports of the fifth priority valve (35) and the sixth priority valve (36) are respectively connected with a first oil supply path (P1) and a second oil supply path (P2).
10. A hydraulic system for a working machine, characterized by comprising a hydraulic control circuit according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210410064.3A CN114810712A (en) | 2022-04-19 | 2022-04-19 | Hydraulic control loop and engineering machinery hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210410064.3A CN114810712A (en) | 2022-04-19 | 2022-04-19 | Hydraulic control loop and engineering machinery hydraulic system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114810712A true CN114810712A (en) | 2022-07-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210410064.3A Pending CN114810712A (en) | 2022-04-19 | 2022-04-19 | Hydraulic control loop and engineering machinery hydraulic system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114810712A (en) |
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2022
- 2022-04-19 CN CN202210410064.3A patent/CN114810712A/en active Pending
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