Load-sensitive hydraulic system automatic compensation module and load-sensitive hydraulic system

Abstract

The application relates to the technical field of hydraulic control, and discloses an automatic compensation module of a load-sensitive hydraulic system and the load-sensitive hydraulic system, wherein the automatic compensation module of the load-sensitive hydraulic system comprises a main oil path, a load-sensitive oil path, a load feedback oil path, a first hydraulic control reversing valve and a second hydraulic control reversing valve; the oil inlet of the first hydraulic control reversing valve is communicated with the main oil path; the oil outlet of the first hydraulic control reversing valve is communicated with the load-sensitive oil path; the hydraulic control port of the first hydraulic control reversing valve is communicated with the load feedback oil path; the oil inlet and the hydraulic control port of the second hydraulic control reversing valve are respectively communicated with the hydraulic control port of the first hydraulic control reversing valve; and the oil outlet of the second hydraulic control reversing valve is communicated with the load-sensitive oil path. The load-sensitive hydraulic system adopting the automatic compensation module of the load-sensitive hydraulic system can meet the demand of long-distance transmission, can meet the demand of quick response of long-distance transmission of the hydraulic system, and can retain the energy-saving advantage of the load-sensitive system.

Description

Technical Field

[0001] This invention relates to the field of hydraulic control technology, and in particular to an automatic compensation module for a load-sensitive hydraulic system and a load-sensitive hydraulic system. Background Technology

[0002] Load-sensitive control is a common control method in hydraulic systems. Its hydraulic pump output pressure is related to the load force rather than constant, and it has the characteristics of high efficiency and good energy saving.

[0003] Conventional constant pressure control systems respond quickly for both long and short distances when transmitting pressure, but they are not energy efficient. Load-sensitive control is more energy-efficient than constant pressure systems, but when transmitting hydraulic power over long distances, the load feedback is not sensitive, and the system pressure build-up is slow. In applications with transmission distances exceeding 10 meters, the system response delay can reach several seconds or even tens of seconds, making it unsuitable for situations requiring rapid response. Therefore, improvements are needed. Summary of the Invention

[0004] Based on the above problems, the purpose of this invention is to provide an automatic compensation module for a load-sensitive hydraulic system and a load-sensitive hydraulic system, so as to overcome the defect of slow response of existing load-sensitive hydraulic systems when transmitting over long distances.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An automatic compensation module for a load-sensitive hydraulic system includes a main oil circuit, a load-sensitive oil circuit, a load feedback oil circuit, a first hydraulically controlled directional valve, and a second hydraulically controlled directional valve. The inlet of the first hydraulically controlled directional valve is connected to the main oil circuit, the outlet of the first hydraulically controlled directional valve is connected to the load-sensitive oil circuit, and the hydraulic control port of the first hydraulically controlled directional valve is connected to the load feedback oil circuit. The inlet and hydraulic control port of the second hydraulically controlled directional valve are respectively connected to the hydraulic control port of the first hydraulically controlled directional valve, and the outlet of the second hydraulically controlled directional valve is connected to the load-sensitive oil circuit. In the initial state, there is no pressure in the load feedback oil circuit, the first hydraulically controlled directional valve is in the open state, the second hydraulically controlled directional valve is in the closed state, and the main oil circuit and the load-sensitive oil circuit are connected, realizing constant pressure control of the hydraulic system. In the working state, pressure is generated in the load feedback oil circuit, the first hydraulically controlled directional valve is in the closed state, the second hydraulically controlled directional valve is in the open state, and the load feedback oil circuit and the load-sensitive oil circuit are connected, realizing load-sensitive control of the hydraulic system.

[0007] As an optional solution, the load-sensitive hydraulic system automatic compensation module also includes a pressure relief circuit and a solenoid directional valve. The inlet of the solenoid directional valve is connected to the load-sensitive circuit, and the outlet of the solenoid directional valve is connected to the pressure relief circuit. In the initial state, the solenoid directional valve is energized and is in the open state, and the load-sensitive circuit and the pressure relief circuit are connected, thereby limiting the pressure build-up of the hydraulic system and realizing pressure reduction start-up. In the working state, the solenoid directional valve is de-energized and is in the open circuit state.

[0008] As an optional solution, the load-sensitive hydraulic system automatic compensation module also includes a pressure relief circuit and a relief valve. The inlet of the relief valve is connected to the load-sensitive circuit, and the outlet of the relief valve is connected to the pressure relief circuit, thereby realizing pressure control of the hydraulic system.

[0009] As an optional solution, a first shut-off valve is installed on the connecting pipeline between the oil inlet of the first hydraulic directional valve and the main oil circuit, and a second shut-off valve is installed on the connecting pipeline between the hydraulic control port of the first hydraulic directional valve and the load feedback oil circuit. When the first shut-off valve is closed, after the pressure in the load feedback oil circuit reaches the switching pressure of the second hydraulic directional valve, the load feedback oil circuit is connected to the load-sensitive oil circuit to realize the forced load-sensitive control of the hydraulic system; when the second shut-off valve is closed, the main oil circuit is connected to the load-sensitive oil circuit to realize the forced constant pressure control of the hydraulic system.

[0010] As an alternative, a throttle valve is installed on the connecting pipeline between the oil inlet of the first hydraulic directional valve and the main oil circuit.

[0011] As an alternative, both the first and second hydraulically controlled directional valves are two-position two-way valves.

[0012] As an optional solution, a pressure test port is installed on the load-sensitive oil circuit.

[0013] As can be seen, compared with the existing technology, this load-sensitive hydraulic system automatic compensation module realizes the function of automatic switching between constant pressure control and load-sensitive control of the hydraulic system, thus meeting the needs of rapid response while retaining the energy-saving advantage, and is suitable for conventional load-sensitive variable pump systems.

[0014] On the other hand, the present invention adopts the following technical solution:

[0015] A load-sensitive hydraulic system includes a load-sensitive variable pump module, an external speed control valve module, and the aforementioned load-sensitive hydraulic system automatic compensation module, wherein:

[0016] The load-sensitive variable pump module is equipped with a variable pump and a pump load-sensitive oil port.

[0017] The inlet of the external speed control valve module is connected to the outlet of the variable pump, and the outlet of the external speed control valve module is connected to the load oil circuit.

[0018] The main oil circuit of the load-sensitive hydraulic system automatic compensation module is connected to the outlet of the variable pump, the load-sensitive oil circuit of the load-sensitive hydraulic system automatic compensation module is connected to the pump load-sensitive oil port, and the load feedback oil circuit of the load-sensitive hydraulic system automatic compensation module is connected to the load oil circuit.

[0019] It is evident that, compared with existing technologies, the load-sensitive hydraulic system employing the aforementioned automatic compensation module can meet the requirements of long-distance transmission, satisfying both the rapid response requirements of long-distance hydraulic system transmission and retaining the energy-saving advantages of the load-sensitive system. Attached Figure Description

[0020] Figure 1 This is a hydraulic schematic diagram of the automatic compensation module for a load-sensitive hydraulic system provided in an embodiment of the present invention;

[0021] Figure 2 This is a hydraulic schematic diagram of a load-sensitive hydraulic system provided in an embodiment of the present invention.

[0022] In the picture:

[0023] 100. Load-sensitive hydraulic system automatic compensation module; 101. Main oil circuit; 102. Load-sensitive oil circuit; 103. Load feedback oil circuit; 104. First hydraulic directional valve; 105. Second hydraulic directional valve; 106. Pressure relief oil circuit; 107. Solenoid directional valve; 108. Relief valve; 109. First shut-off valve; 110. Second shut-off valve; 111. Throttle valve; 112. Pressure test port;

[0024] 200. Load-sensitive variable pump module; 201. Variable pump; 202. Pump load-sensitive oil port;

[0025] 300. External speed control valve module. Detailed Implementation

[0026] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] To address the issues of poor energy efficiency in existing constant pressure control systems and slow response in existing load-sensitive hydraulic systems during long-distance transmission, please refer to [link to relevant documentation]. Figure 1As shown, this preferred embodiment provides a load-sensitive hydraulic system automatic compensation module 100, including a main oil circuit 101, a load-sensitive oil circuit 102, a load feedback oil circuit 103, a first hydraulic control directional valve 104, and a second hydraulic control directional valve 105.

[0028] The oil inlet of the first hydraulic directional valve 104 is connected to the main oil circuit 101, the oil outlet of the first hydraulic directional valve 104 is connected to the load-sensitive oil circuit 102, the hydraulic control port of the first hydraulic directional valve 104 is connected to the load feedback oil circuit 103, the oil inlet and hydraulic control port of the second hydraulic directional valve 105 are respectively connected to the hydraulic control port of the first hydraulic directional valve 104, and the oil outlet of the second hydraulic directional valve 105 is connected to the load-sensitive oil circuit 102.

[0029] Preferably, both the first hydraulic control directional valve 104 and the second hydraulic control directional valve 105 are two-position two-way valves, which achieve automatic switching between the open and closed circuits through pressure control in the hydraulic system.

[0030] In the initial state, there is no pressure in the load feedback oil circuit 103, the first hydraulic control directional valve 104 is in the open state, the second hydraulic control directional valve 105 is in the closed state, and the main oil circuit 101 is connected to the load sensitive oil circuit 102 to realize constant pressure control of the hydraulic system.

[0031] In operation, pressure is generated in the load feedback oil circuit 103, the first hydraulic control directional valve 104 is in the open state, the second hydraulic control directional valve 105 is in the open state, and the load feedback oil circuit 103 establishes a connection with the load sensitive oil circuit 102 to realize the load sensitive control of the hydraulic system.

[0032] Specifically, the load-sensitive hydraulic system automatic compensation module 100 also includes a pressure relief oil circuit 106 and a solenoid directional valve 107. The oil inlet of the solenoid directional valve 107 is connected to the load-sensitive oil circuit 102, and the oil outlet of the solenoid directional valve 107 is connected to the pressure relief oil circuit 106. In the initial state, the solenoid directional valve 107 is energized and is in the open state. The load-sensitive oil circuit 102 is connected to the pressure relief oil circuit 106, thereby limiting the pressure build-up of the hydraulic system and realizing pressure reduction start-up. In the working state, the solenoid directional valve 107 is de-energized and is in the open circuit state.

[0033] Specifically, the load-sensitive hydraulic system automatic compensation module 100 also includes a relief valve 108, the oil inlet of which is connected to the load-sensitive oil circuit 102, and the oil outlet of which is connected to the pressure relief oil circuit 106, thereby realizing pressure control of the hydraulic system.

[0034] Furthermore, a first shut-off valve 109 is provided on the oil inlet of the first hydraulic directional valve 104 and the connecting pipeline of the main oil circuit 101, and a second shut-off valve 110 is provided on the hydraulic port of the first hydraulic directional valve 104 and the connecting pipeline of the load feedback oil circuit 103.

[0035] When the first shut-off valve 109 is closed, after the pressure of the load feedback oil circuit 103 reaches the switching pressure of the second hydraulic directional valve 105, the load feedback oil circuit 103 establishes a connection with the load sensitive oil circuit 102 to realize the forced load sensitive control of the hydraulic system; when the second shut-off valve 110 is closed, the main oil circuit 101 establishes a connection with the load sensitive oil circuit 102 to realize the forced constant pressure control of the hydraulic system.

[0036] Furthermore, a throttle valve 111 is provided on the oil inlet of the first hydraulic directional valve 104 and the connecting pipeline of the main oil circuit 101 to regulate the flow rate in the constant pressure control mode.

[0037] In addition, a pressure test port 112 is provided on the load-sensitive oil circuit 102 to facilitate the testing of the hydraulic system.

[0038] Based on this, this embodiment also provides a load-sensitive hydraulic system, which includes a load-sensitive variable pump module 200, an external speed control valve module 300, and the aforementioned load-sensitive hydraulic system automatic compensation module 100, as detailed below. Figure 2 .

[0039] The load-sensitive variable pump module 200 includes a variable pump 201 and a pump load-sensitive oil port 202.

[0040] The oil inlet of the external speed control valve module 300 is connected to the oil outlet of the variable pump 201, and the oil outlet of the external speed control valve module 300 is connected to the load oil circuit.

[0041] The main oil circuit 101 of the load-sensitive hydraulic system automatic compensation module 100 is connected to the oil outlet of the variable pump 201, the load-sensitive oil circuit 102 of the load-sensitive hydraulic system automatic compensation module 100 is connected to the pump load-sensitive oil port 202, and the load feedback oil circuit 103 of the load-sensitive hydraulic system automatic compensation module 100 is connected to the load oil circuit.

[0042] Therefore, this load-sensitive hydraulic system can achieve the following functions:

[0043] 1) Automatic switching of control modes

[0044] Initially, since the load feedback oil circuit 103 has not yet established pressure, the first hydraulic directional valve 104 operates in the lower position function shown in the figure, and the second hydraulic directional valve 105 operates in the left position function. At this time, the oil outlet of the variable pump 201 establishes a connection with the pump load sensitive oil port 202 through the main oil circuit 101, the first shut-off valve 109, the throttle valve 111, the first hydraulic directional valve 104, and the load sensitive oil circuit 102, thereby realizing constant pressure control of the hydraulic system and completing the rapid response of the hydraulic system pressure.

[0045] Once the hydraulic system pressure is established, the load feedback oil circuit 103 completes the pressure build-up accordingly. At this time, the load feedback oil circuit 103 has sufficient pressure to complete the functional switching of the first hydraulic directional valve 104 and the second hydraulic directional valve 105. The first hydraulic directional valve 104 operates in the upper position function, and the second hydraulic directional valve 105 operates in the right position function. At this time, the load oil circuit establishes a connection with the pump load sensitive oil port 202 through the load feedback oil circuit 103, the second shut-off valve 110, the second hydraulic directional valve 105, and the load sensitive oil circuit 102, thereby realizing the load sensitive control of the hydraulic system.

[0046] 2) Reduced-voltage start

[0047] When the variable pump 201 starts, in order to reduce the impact, the solenoid directional valve 107 is energized and the function of the solenoid directional valve 107 is switched to the left position. At this time, the load-sensitive oil circuit 102 is connected to the pressure relief oil circuit 106 through the solenoid directional valve 107, thereby limiting the pressure build-up capacity of the variable pump 201 and thus realizing the pressure reduction start-up of the hydraulic system.

[0048] 3) Pressure control

[0049] The maximum pressure control of the hydraulic system can be achieved by setting the pressure of the relief valve 108. Specifically, when the solenoid directional valve 107 is de-energized, the function of the solenoid directional valve 107 switches to the right position. At this time, the pump load sensitive oil port 202 establishes a connection with the relief valve 108 through the pump load sensitive oil circuit 102, thereby realizing the pressure control of the hydraulic system.

[0050] 4) Forced constant pressure system

[0051] When the second shut-off valve 110 is closed, the oil outlet of the variable pump 201 is connected to the pump load-sensitive oil port 202 through the main oil circuit 101, the first shut-off valve 109, the throttle valve 111, the first hydraulic control directional valve 104 and the load-sensitive oil circuit 102, thereby realizing constant pressure control of the hydraulic system.

[0052] 5) Forced load-sensitive system

[0053] When the first shut-off valve 109 is closed, and the pressure in the load feedback oil circuit 103 reaches the switching pressure of the second hydraulic directional valve 105, the load feedback oil circuit 103 has sufficient pressure to complete the functional switching of the first hydraulic directional valve 104 and the second hydraulic directional valve 105. At this time, the load oil circuit establishes a connection with the pump load sensitive oil port 202 through the load feedback oil circuit 103, the second shut-off valve 110, the second hydraulic directional valve 105 and the load sensitive oil circuit 102, thereby realizing only the load sensitive control of the hydraulic system.

[0054] It is evident that the above-mentioned load-sensitive hydraulic system automatic compensation module 100 and load-sensitive hydraulic system have the following advantages:

[0055] ① Improved feedback response performance of long-distance hydraulic load-sensitive system. By automatically switching the control mode of hydraulic system, the response capability of hydraulic system is improved. It can meet the fast response requirements of long-distance transmission of hydraulic system while retaining the energy-saving advantages of load-sensitive system.

[0056] ② It is easy to switch the control mode. By opening or closing the first shut-off valve 109 or the second shut-off valve 110, the control mode of the hydraulic system can be switched as needed.

[0057] ③ The electromagnetic directional valve 107 here has a manual switching function. When the electromagnetic directional valve 107 loses power abnormally, it can be switched in an emergency, which improves the reliability of the hydraulic system.

[0058] ④ The pressure at the pump load sensitive oil port 202 in the load sensitive variable pump module 200 can be measured through the pressure measuring port 112, which facilitates the testing of the hydraulic system;

[0059] ⑤ This load-sensitive hydraulic system automatic compensation module 100 is highly adaptable and applicable to all conventional load-sensitive variable pump systems on the market.

[0060] The above embodiments merely illustrate the basic principles and characteristics of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic compensation module for a load-sensitive hydraulic system, characterized in that, It includes a main oil circuit (101), a load-sensitive oil circuit (102), a load feedback oil circuit (103), a first hydraulic directional valve (104), and a second hydraulic directional valve (105). The inlet of the first hydraulically controlled directional valve (104) is connected to the main oil circuit (101), the outlet of the first hydraulically controlled directional valve (104) is connected to the load-sensitive oil circuit (102), and the hydraulically controlled port of the first hydraulically controlled directional valve (104) is connected to the load feedback oil circuit (103). The oil inlet and hydraulic control port of the second hydraulic directional valve (105) are respectively connected to the hydraulic control port of the first hydraulic directional valve (104), and the oil outlet of the second hydraulic directional valve (105) is connected to the load-sensitive oil circuit (102). In the initial state, there is no pressure in the load feedback oil circuit (103), the first hydraulic control directional valve (104) is in the open state, the second hydraulic control directional valve (105) is in the closed state, the main oil circuit (101) is connected to the load sensitive oil circuit (102) to realize constant pressure control of the hydraulic system; In the working state, pressure is generated in the load feedback oil circuit (103), the first hydraulic control directional valve (104) is in the open state, the second hydraulic control directional valve (105) is in the open state, the load feedback oil circuit (103) is connected to the load sensitive oil circuit (102), and the load sensitive control of the hydraulic system is realized.

2. The automatic compensation module for a load-sensitive hydraulic system according to claim 1, characterized in that, It also includes a pressure relief oil circuit (106) and a solenoid directional valve (107), the oil inlet of which is connected to the load-sensitive oil circuit (102), and the oil outlet of which is connected to the pressure relief oil circuit (106). In the initial state, the electromagnetic directional valve (107) is energized and is in the open state. The load-sensitive oil circuit (102) is connected to the pressure relief oil circuit (106), thereby limiting the pressure build-up of the hydraulic system and realizing pressure reduction start-up. In operation, the electromagnetic reversing valve (107) is de-energized and is in an open circuit state.

3. The automatic compensation module for a load-sensitive hydraulic system according to claim 1, characterized in that, It also includes a pressure relief oil circuit (106) and a relief valve (108). The oil inlet of the relief valve (108) is connected to the load-sensitive oil circuit (102), and the oil outlet of the relief valve (108) is connected to the pressure relief oil circuit (106) to realize pressure control of the hydraulic system.

4. The automatic compensation module for a load-sensitive hydraulic system according to claim 1, characterized in that, A first shut-off valve (109) is provided on the oil inlet of the first hydraulic directional valve (104) and the connecting pipeline of the main oil circuit (101), and a second shut-off valve (110) is provided on the hydraulic control port of the first hydraulic directional valve (104) and the connecting pipeline of the load feedback oil circuit (103). When the first shut-off valve (109) is closed, after the pressure of the load feedback oil circuit (103) reaches the switching pressure of the second hydraulic control directional valve (105), the load feedback oil circuit (103) is connected to the load sensitive oil circuit (102) to realize the forced load sensitive control of the hydraulic system. When the second shut-off valve (110) is closed, the main oil circuit (101) is connected to the load-sensitive oil circuit (102) to realize the forced constant pressure control of the hydraulic system.

5. The automatic compensation module for a load-sensitive hydraulic system according to claim 1, characterized in that, A throttle valve (111) is provided on the oil inlet of the first hydraulic directional valve (104) and the connecting pipeline of the main oil circuit (101).

6. The automatic compensation module for a load-sensitive hydraulic system according to claim 1, characterized in that, Both the first hydraulic control directional valve (104) and the second hydraulic control directional valve (105) are two-position two-way valves.

7. The automatic compensation module for a load-sensitive hydraulic system according to claim 1, characterized in that, A pressure testing port (112) is provided on the load-sensitive oil circuit (102).

8. A load-sensitive hydraulic system, characterized in that, The system includes a load-sensitive variable pump module (200), an external speed control valve module (300), and a load-sensitive hydraulic system automatic compensation module (100) as described in any one of claims 1-7, wherein: The load-sensitive variable pump module (200) is equipped with a variable pump (201) and a pump load-sensitive oil port (202); The inlet of the external speed control valve module (300) is connected to the outlet of the variable pump (201), and the outlet of the external speed control valve module (300) is connected to the load oil circuit. The main oil circuit (101) of the load-sensitive hydraulic system automatic compensation module (100) is connected to the oil outlet of the variable pump (201), the load-sensitive oil circuit (102) of the load-sensitive hydraulic system automatic compensation module (100) is connected to the pump load-sensitive oil port (202), and the load feedback oil circuit (103) of the load-sensitive hydraulic system automatic compensation module (100) is connected to the load oil circuit.

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