Anti-cavitation hydraulic control system and operating machinery

Abstract

The present invention provides an anti-cavitation hydraulic control system and an operating machine. The anti-cavitation hydraulic control system includes a first oil circuit and a second oil circuit, one end of the first oil circuit is connected to the first oil chamber of the hydraulic actuator, one end of the second oil circuit is connected to the second oil chamber of the hydraulic actuator, and also includes a pressure regulating valve and a first non-return valve; one end of the valve stem of the pressure regulating valve is provided with a hydraulic control end, and the other end of the valve stem is provided with an elastic end; the oil circuit channel of the pressure regulating valve is provided in at least one of the first oil circuit and the second oil circuit, and the first non-return valve is connected in parallel to the two ends of the oil circuit channel of the pressure regulating valve; when the oil circuit channel of the pressure regulating valve is provided in the first oil circuit, the hydraulic control end of the pressure regulating valve is connected to the second oil chamber; when the oil circuit channel of the pressure regulating valve is provided in the second oil circuit, the hydraulic control end of the pressure regulating valve is connected to the first oil chamber. The present invention can not only avoid the energy loss of the hydraulic actuator due to the excessive back pressure on the return oil side, but also prevent cavitation from occurring on the oil inlet side of the hydraulic actuator.

Description

Technical Field

[0001] The present invention relates to the technical field of operating machinery, and in particular to an anti-air suction hydraulic control system and an operating machinery. Background Art

[0002] At present, construction machinery is widely used in industries such as construction, transportation, mining and water conservancy projects. As an important construction and mining equipment, hydraulic excavators play a very important role in engineering construction and ore mining.

[0003] In the process of boom unloading of existing excavators, the boom cylinder, which serves as a hydraulic actuator, often experiences cavitation. In order to solve the cavitation problem of the hydraulic actuator, the conventional practice is to add hydraulic oil to the working oil chamber of the hydraulic actuator on the cavitation side, or to increase the back pressure of the back pressure chamber of the hydraulic actuator. However, if the back pressure increased in the back pressure chamber is too high, it will affect the operating capacity of the hydraulic actuator; if the back pressure of the back pressure chamber is too small, the hydraulic actuator will not be able to prevent cavitation. In the related art, there is also a method of controlling the establishment of the back pressure of the hydraulic actuator by changing the return oil volume of the reversing valve. However, this control method cannot effectively improve the cavitation phenomenon of the hydraulic actuator, and will also affect the reversing control of the hydraulic actuator. Summary of the invention

[0004] The present invention provides an anti-cavitation hydraulic control system and an operating machine, which are used to solve the problem that it is currently difficult to effectively improve the cavitation problem occurring during the operation of hydraulic actuators.

[0005] The present invention provides an anti-cavitation hydraulic control system, comprising a first oil circuit and a second oil circuit, wherein one end of the first oil circuit is used to communicate with a first oil chamber of a hydraulic actuator, and one end of the second oil circuit is used to communicate with a second oil chamber of the hydraulic actuator; and further comprising: a pressure regulating valve and a first one-way valve; one end of a valve stem of the pressure regulating valve is provided with a hydraulic control end, and the other end of the valve stem is provided with an elastic end; the valve stem dynamically adjusts the opening of the oil circuit channel of the pressure regulating valve in real time according to the oil pressure of the hydraulic control end and the elastic force of the elastic end; the oil circuit channel of the pressure regulating valve is provided in at least one of the first oil circuit and the second oil circuit, and the first one-way valve is connected in parallel to the two ends of the oil circuit channel of the pressure regulating valve; when the oil circuit channel of the pressure regulating valve is provided in the first oil circuit, the hydraulic control end of the pressure regulating valve is communicated with the second oil chamber; when the oil circuit channel of the pressure regulating valve is provided in the second oil circuit, the hydraulic control end of the pressure regulating valve is communicated with the first oil chamber.

[0006] According to an anti-cavitation hydraulic control system provided by the present invention, it also includes: a hydraulic reversing valve; one of the other end of the first oil circuit and the other end of the second oil circuit is connected to the first working oil port of the hydraulic reversing valve; the other end of the first oil circuit and the other end of the second oil circuit is connected to the second working oil port of the hydraulic reversing valve.

[0007] According to an anti-cavitation hydraulic control system provided by the present invention, it also includes: an oil tank and a first liquid pump; the first end of the first liquid pump is connected to the oil tank, the second end of the first liquid pump is connected to the oil inlet of the hydraulic reversing valve, and the oil return port of the hydraulic reversing valve is connected to the oil tank.

[0008] An anti-cavitation hydraulic control system provided according to the present invention further includes: a second one-way valve; the second one-way valve is arranged in the oil circuit between the second end of the first liquid pump and the oil inlet of the hydraulic reversing valve.

[0009] An anti-cavitation hydraulic control system provided according to the present invention also includes: a pilot oil circuit; the pilot oil circuit includes a second liquid pump and a pilot control valve; the first end of the second liquid pump is connected to the oil tank, and the second end of the second liquid pump is connected to the first end of the pilot control valve; the second end of the pilot control valve is connected to the first pilot end of the hydraulic reversing valve, and the third end of the pilot control valve is connected to the second pilot end of the hydraulic reversing valve; wherein the pilot control valve has a first conducting state and a second conducting state; in the first conducting state, the first end of the pilot control valve is connected to the second end; in the second conducting state, the first end of the pilot control valve is connected to the third end.

[0010] According to the present invention, an anti-cavitation liquid control system also includes: a first overflow valve; the first overflow valve is arranged between the second end of the first liquid pump and the oil tank; and / or, it also includes: a second overflow valve; the second overflow valve is arranged between the second end of the second liquid pump and the oil tank.

[0011] An anti-cavitation liquid control system provided according to the present invention further includes: a rotation drive mechanism; the first liquid pump and the second liquid pump are commonly connected to the rotation drive mechanism.

[0012] According to an anti-cavitation hydraulic control system provided by the present invention, the hydraulic reversing valve is a two-position four-way reversing valve, and the pressure regulating valve is a two-position two-way reversing valve.

[0013] According to an anti-cavitation hydraulic control system provided by the present invention, the hydraulic actuator is any one of a hydraulic pump, a hydraulic motor and a hydraulic cylinder.

[0014] The present invention also provides an operating machine, comprising the anti-cavitation hydraulic control system as described above, or the anti-cavitation device for the boom cylinder of an excavator as described above.

[0015] The present invention provides an anti-cavitation hydraulic control system and operating machinery. By setting a pressure regulating valve and a first non-return valve, when the hydraulic actuator is switched, the return oil volume of the oil chamber on the oil return side of the hydraulic actuator can be automatically adjusted by the pressure regulating valve according to the oil pressure of the oil chamber on the oil inlet side of the hydraulic actuator, so as to dynamically and automatically adjust the pressure of the oil chamber on the oil return side as needed, thereby avoiding energy loss caused by excessive back pressure on the oil return side and effectively preventing cavitation problems on the oil inlet side. When the anti-cavitation hydraulic control system shown in the present invention is applied to an excavator, anti-cavitation control of the excavation and unloading actions of the excavator can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is one of the structural schematic diagrams of the anti-cavitation liquid control system provided by the present invention;

[0018] Figure 2 This is the second structural schematic diagram of the anti-vacuum liquid control system provided by the present invention;

[0019] Figure 3 This is the third structural schematic diagram of the anti-vacuum liquid control system provided by the present invention;

[0020] Figure 4 It is a structural schematic diagram of the excavator provided by the present invention performing unloading operation;

[0021] Reference numerals:

[0022] 1: Oil tank; 2: First liquid pump; 3: Second one-way valve;

[0023] 4: Hydraulic reversing valve; 5: Pressure regulating valve; 6: First check valve;

[0024] 7: Hydraulic actuator; 8: Second hydraulic pump; 9: Pilot control valve;

[0025] 10: first overflow valve; 11: second overflow valve; 12: rotation drive mechanism;

[0026] 13: chassis; 14: boom; 15: arm cylinder;

[0027] 16: bucket; 100: first oil circuit; 200: second oil circuit;

[0028] 51: first pressure regulating valve; 52: second pressure regulating valve. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Combine the following Figures 1 to 4 The present invention describes an anti-cavitation hydraulic control system and an operating machine.

[0031] like Figures 1 to 3 As shown, this embodiment provides an anti-cavitation hydraulic control system, including: a first oil circuit 100 and a second oil circuit 200, one end of the first oil circuit 100 is connected to the first oil chamber of the hydraulic actuator 7, and one end of the second oil circuit 200 is connected to the second oil chamber of the hydraulic actuator 7.

[0032] Furthermore, the system shown in this embodiment is also provided with a pressure regulating valve 5 and a first one-way valve 6. The pressure regulating valve 5 shown in this embodiment is provided with a hydraulic control end and an elastic end, one end of the valve stem of the pressure regulating valve 5 is provided with a hydraulic control end, and the other end of the valve stem is provided with an elastic end; the valve stem dynamically adjusts the opening of the oil passage of the pressure regulating valve 5 in real time according to the oil pressure of the hydraulic control end and the elastic force of the elastic end, that is, the position of the valve stem in the valve stem cavity of the pressure regulating valve 5 is determined according to the oil pressure of the hydraulic control end and the elastic force of the elastic end, and the pressure regulating valve 5 adjusts the opening of the oil passage of the pressure regulating valve according to the position of the valve stem in the valve stem cavity.

[0033] Specifically, when the oil pressure at the hydraulic control end is relatively small, the elastic force at the elastic end is also relatively small, and the valve stem can maintain the first equilibrium state under the joint action of the oil pressure at the hydraulic control end and the elastic force at the elastic end, for example: when the valve stem is in the right position of the pressure regulating valve 5, the oil passage of the pressure regulating valve 5 maintains the first opening. Correspondingly, when the oil pressure at the hydraulic control end is relatively large, the valve stem will move to the left under the action of the oil pressure, which gradually increases the elastic force at the elastic end until the valve stem reaches the second equilibrium state under the joint action of the oil pressure at the hydraulic control end and the elastic force at the elastic end, for example: when the valve stem is in the left position of the pressure regulating valve 5, the oil passage of the pressure regulating valve 5 maintains the second opening, and the second opening of the pressure regulating valve 5 is greater than the first opening of the pressure regulating valve 5.

[0034] Among them, the oil circuit channel of the pressure regulating valve 5 shown in this embodiment is arranged in at least one of the first oil circuit 100 and the second oil circuit 200, and the first one-way valve 6 is connected in parallel to the two ends of the oil circuit channel of the pressure regulating valve 5; when the oil circuit channel of the pressure regulating valve 5 is arranged in the first oil circuit 100, the hydraulic control end of the pressure regulating valve 5 is connected to the second oil chamber; when the oil circuit channel of the pressure regulating valve 5 is arranged in the second oil circuit 200, the hydraulic control end of the pressure regulating valve 5 is connected to the first oil chamber.

[0035] Specifically, by setting a pressure regulating valve and a first one-way valve, this embodiment can automatically adjust the return oil volume of the oil chamber on the oil return side of the hydraulic actuator according to the oil pressure in the oil chamber on the oil inlet side of the hydraulic actuator through the pressure regulating valve when performing switching control on the hydraulic actuator, so as to dynamically and automatically adjust the pressure of the oil chamber on the oil return side as needed, thereby avoiding energy loss due to excessive back pressure on the oil return side and effectively preventing the problem of cavitation on the oil inlet side.

[0036] It should be noted that the hydraulic reversing valve 4 shown in this embodiment is a two-position four-way reversing valve, and the pressure regulating valve 5 is a two-position two-way reversing valve. The hydraulic actuator 7 shown in this embodiment is any one of a hydraulic pump, a hydraulic motor and a hydraulic cylinder, which is not specifically limited.

[0037] like Figure 1 As shown, when the system shown in this embodiment is applied to an excavator, the hydraulic actuator 7 shown in this embodiment is a boom cylinder. One end of the first oil circuit 100 shown in this embodiment is connected to the rod chamber of the boom cylinder, and one end of the second oil circuit 200 is connected to the rodless chamber of the boom cylinder. The oil circuit channel of the pressure regulating valve 5 is arranged on the second oil circuit 200. The first one-way valve 6 is connected in parallel to both ends of the oil circuit channel of the pressure regulating valve 5. The hydraulic control end of the pressure regulating valve 5 is connected to the rod chamber of the boom cylinder.

[0038] When the excavator is ready to unload, under the action of the bucket's gravity, the piston rod of the arm cylinder will move toward the side of the rodless chamber of the arm cylinder. Based on the design of the pressure regulating valve 5, this embodiment can adaptively adjust the oil pressure of the rodless chamber of the arm cylinder according to the oil pressure of the rod chamber of the arm cylinder to achieve anti-cavitation control of the unloading action of the excavator. Among them, when the oil is fed into the rodless chamber of the arm cylinder through the first one-way valve 6, the oil can be directly returned through the first oil circuit 100. At this time, the return oil of the arm cylinder is not affected by the opening of the pressure regulating valve 5.

[0039] like Figure 4 As shown, the excavator shown in this embodiment includes a chassis 13, a boom 14, an arm cylinder 15 and a bucket 16. The arm cylinder 15 and the bucket 16 are arranged on the boom 14, and the arm cylinder 15 drives the bucket 16 to perform the excavation action.

[0040] When the excavator is Figure 4In the state shown, the excavator's boom moves downward due to gravity, which makes Figure 1 The piston rod of the boom cylinder 15 shown is subjected to a force acting to the right. Since gravity exerts a large force on the piston rod of the boom cylinder 15, a large negative pressure will be generated in the rod chamber of the boom cylinder 15. At this time, the pressure in the rod chamber is very low, and the pressure at the hydraulic control end of the pressure regulating valve 5 is very low. The valve stem of the pressure regulating valve 5 is located at the rightmost position under the action of the spring at the elastic end. When the valve stem of the pressure regulating valve 5 is in the right position, the opening (opening amount) of the oil circuit of the pressure regulating valve 5 is small, which will lead to a decrease in the return oil volume of the rodless chamber of the boom cylinder 15, and the rodless chamber will generate a large back pressure.

[0041] During the swinging of the excavator's boom around the hinge point, the force exerted by gravity on the piston rod of the boom cylinder 15 will become smaller and smaller. During this process, the oil pressure of the rod chamber of the boom cylinder 15 gradually increases from small to large, and the pressure of the hydraulic control end of the pressure regulating valve 5 also gradually increases. Under the action of this pressure, the valve stem of the pressure regulating valve 5 will gradually move from the rightmost position to the leftmost position, and the movement amount of the valve stem of the pressure regulating valve 5 is controlled by the size of the oil pressure of the rod chamber, and the movement amount is proportional to the size of the oil pressure of the rod chamber. At this time, the volume of the rodless chamber of the boom cylinder 15 gradually decreases. During the entire movement process, the pressure of the rod chamber of the boom cylinder 15 is affected by the back pressure of the rodless chamber of the boom cylinder 15, and the boom cylinder 15 will not be sucked empty. Here, through reasonable design, it can be ensured that the pressure of the rod chamber and the rodless chamber of the boom cylinder 15 reaches a dynamic balance, and the pressure of the rod chamber of the boom cylinder 15 is maintained at a constant value. When the displacement of the valve stem of the pressure regulating valve 5 and the opening area of ​​the oil circuit are constant, the pressure value is related to the preload setting value of the spring at the elastic end of the pressure regulating valve 5 .

[0042] In the above process, since the pressure of the rodless chamber of the boom cylinder 15 is affected by the position of the valve stem of the pressure regulating valve 5, and the position of the valve stem of the pressure regulating valve 5 is controlled by the oil pressure of the rod chamber of the boom cylinder 15, the back pressure of the boom cylinder 15 depends only on the oil pressure of the rod chamber of the boom cylinder 15, and has nothing to do with the flow rate of the return oil on the return oil side of the hydraulic system, that is, it has nothing to do with the speed of the engine. That is, during the boom unloading process of the excavator, the pressure of the rod chamber of the boom cylinder 15 can be guaranteed at any gear position, so as to achieve the purpose of anti-cavitation control of the boom cylinder 15 during the excavation and unloading operation.

[0043] When the excavator is digging, the pilot control valve 9 can be used to control the reversing valve stem of the hydraulic reversing valve 4 to move to the left. At this time, the first liquid pump 2 outputs pressure oil driven by the engine, passes through the second one-way valve 3 and the hydraulic reversing valve 4, and then enters the rodless chamber of the boom cylinder 15 through the first one-way valve 6. The hydraulic oil in the rod chamber of the boom cylinder 15 flows back to the oil tank 1 through the hydraulic reversing valve 4. In this process, the first one-way valve 6 directly bypasses the oil circuit of the pressure regulating valve 5, that is, in this state, the conduction state of the oil inlet circuit of the boom cylinder 15 is not affected by the oil pressure in the rod chamber of the boom cylinder 15 and the opening of the pressure regulating valve 5.

[0044] like Figure 2 As shown, when the system shown in this embodiment is applied to an excavator, the hydraulic actuator 7 shown in this embodiment is a boom cylinder. One end of the first oil circuit 100 shown in this embodiment is connected to the rod chamber of the boom cylinder, and one end of the second oil circuit 200 is connected to the rodless chamber of the boom cylinder. The oil circuit channel of the pressure regulating valve 5 is arranged on the first oil circuit 100. The first one-way valve 6 is connected in parallel to both ends of the oil circuit channel of the pressure regulating valve 5. The hydraulic control end of the pressure regulating valve 5 is connected to the rodless chamber of the boom cylinder.

[0045] Therefore, when the excavator is performing excavation, the piston rod of the arm cylinder will move toward the side of the rod chamber of the arm cylinder. Based on the design of the pressure regulating valve 5, this embodiment can adaptively adjust the oil pressure of the rod chamber of the arm cylinder according to the oil pressure of the rodless chamber of the arm cylinder to achieve anti-cavitation control of the excavation action of the excavator. In particular, when the oil is fed into the rod chamber of the arm cylinder through the first one-way valve 6, the oil can be directly returned through the second oil circuit 200. At this time, the return oil of the arm cylinder is not affected by the opening of the pressure regulating valve 5.

[0046] like Figure 3 As shown, when the system shown in this embodiment is applied to an excavator, the hydraulic actuator 7 shown in this embodiment is a boom cylinder. One end of the first oil circuit 100 shown in this embodiment is connected to the rod chamber of the boom cylinder, and one end of the second oil circuit 200 is connected to the rodless chamber of the boom cylinder. At the same time, the pressure regulating valve 5 shown in this embodiment is provided with two, namely, the first pressure regulating valve 51 and the second pressure regulating valve 52. The oil passage of the first pressure regulating valve 51 is arranged on the second oil circuit 200. There are two first check valves 6, one of which is connected in parallel to both ends of the oil passage of the first pressure regulating valve 51. The hydraulic control end of the first pressure regulating valve 51 is connected to the rod chamber of the boom cylinder. The oil passage of the second pressure regulating valve 52 is arranged on the first oil circuit 100. The other first check valve is connected in parallel to both ends of the oil passage of the second pressure regulating valve 52. The hydraulic control end of the second pressure regulating valve 52 is connected to the rodless chamber of the boom cylinder.

[0047] Here, in combination with the solutions shown in the above embodiments, it can be seen that this embodiment, based on the design of the first pressure regulating valve 51 and the second pressure regulating valve 52, can achieve two-way anti-cavitation control for excavation and unloading of the excavator.

[0048] Preferably, the present embodiment is further provided with an oil tank 1, a first liquid pump 2 and a hydraulic reversing valve 4; the first working oil port of the hydraulic reversing valve 4 is connected to the other end of the first oil circuit 100, and the second working oil port of the hydraulic reversing valve 4 is connected to the other end of the second oil circuit 200; the first end of the first liquid pump 2 is connected to the oil tank 1, the second end of the first liquid pump 2 is connected to the oil inlet of the hydraulic reversing valve 4, and the oil return port of the hydraulic reversing valve 4 is connected to the oil tank 1.

[0049] In this way, the hydraulic oil in the oil tank 1 shown in this embodiment can be pumped by the first liquid pump 2 and delivered to one of the oil chambers of the hydraulic actuator 7 through a reversing oil circuit of the hydraulic reversing valve 4, and the hydraulic oil in the other oil chamber of the hydraulic actuator 7 is returned to the oil tank 1 through another reversing oil circuit of the hydraulic reversing valve 4.

[0050] In order to facilitate directional control of the hydraulic actuator 7 , the present embodiment further provides a second one-way valve 3 ; the second one-way valve 3 is provided on the oil path between the second end of the first liquid pump 2 and the oil inlet of the hydraulic reversing valve 4 .

[0051] Preferably, in order to facilitate the reversing control of the hydraulic reversing valve 4, the present embodiment is also provided with a pilot oil circuit; the pilot oil circuit includes a second liquid pump 8 and a pilot control valve 9; the first end of the second liquid pump 8 is connected to the oil tank 1, and the second end of the second liquid pump 8 is connected to the first end of the pilot control valve 9; the second end of the pilot control valve 9 is connected to the first pilot end of the hydraulic reversing valve 4, and the third end of the pilot control valve 9 is connected to the second pilot end of the hydraulic reversing valve 4.

[0052] Specifically, the pilot control valve 9 shown in this embodiment has a first conducting state and a second conducting state, and the hydraulic reversing valve 4 can adopt the ABPT oil circuit known in the art; when the pilot control valve 9 is in the first conducting state, the first end of the pilot control valve 9 is connected to the second end, and the reversing valve stem of the hydraulic reversing valve 4 can be controlled to move right to the right position, so that the oil port P of the hydraulic reversing valve 4 is connected to the oil port B, and the oil port A is connected to the oil port T; when the pilot control valve 9 is in the second conducting state, the first end of the pilot control valve 9 is connected to the third end, and the reversing valve stem of the hydraulic reversing valve 4 can be controlled to move left to the left position, so that the oil port P of the hydraulic reversing valve 4 is connected to the oil port A, and the oil port B is connected to the oil port T.

[0053] The pilot control valve 9 shown in this embodiment may be a manual pilot valve with a hydraulic control handle, or may be an electrically controlled pilot valve, which is not specifically limited herein.

[0054] Preferably, in order to ensure the safety and stability of the hydraulic oil transportation in the oil circuit, the present embodiment is also provided with a first overflow valve 10 and a second overflow valve 11. The first overflow valve 10 is arranged between the second end of the first liquid pump 2 and the oil tank 1; the second overflow valve 11 is arranged between the second end of the second liquid pump 8 and the oil tank 1.

[0055] Preferably, in order to effectively save energy, the present embodiment is further provided with a rotation drive mechanism 12; the first liquid pump 2 and the second liquid pump 8 are both connected to the rotation drive mechanism 12. The rotation drive mechanism 12 shown in the present embodiment is preferably an engine, and the output end of the engine can be specifically arranged to be coaxially connected to the first liquid pump 2 and the second liquid pump 8, respectively.

[0056] Preferably, the present embodiment further provides an operating machine, comprising the anti-cavitation hydraulic control system as described above, or the anti-cavitation device for the boom cylinder of an excavator as described above.

[0057] Specifically, since the operating machinery shown in this embodiment includes all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0058] The operating machinery shown in this embodiment may be an excavator, a concrete pump truck, a trenching machine, a crane, a fire truck, etc., which are well known in the art and are not specifically limited here.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An anti-cavitation hydraulic control system, comprising a first oil circuit and a second oil circuit, wherein one end of the first oil circuit is used to communicate with a first oil chamber of a hydraulic actuator, and one end of the second oil circuit is used to communicate with a second oil chamber of the hydraulic actuator, characterized in that: It also includes: a pressure regulating valve and a first one-way valve; one end of the valve stem of the pressure regulating valve is provided with a hydraulic control end, and the other end of the valve stem is provided with an elastic end; the valve stem dynamically adjusts the opening of the oil passage of the pressure regulating valve in real time according to the oil pressure of the hydraulic control end and the elastic force of the elastic end; the pressure regulating valve is a two-position two-way reversing valve; The oil passage of the pressure regulating valve is arranged in at least one of the first oil passage and the second oil passage, and the first one-way valve is connected in parallel to both ends of the oil passage of the pressure regulating valve; when the oil passage of the pressure regulating valve is arranged in the first oil passage, the hydraulic control end of the pressure regulating valve is communicated with the second oil chamber; when the oil passage of the pressure regulating valve is arranged in the second oil passage, the hydraulic control end of the pressure regulating valve is communicated with the first oil chamber; It also includes: a hydraulic reversing valve; one of the other ends of the first oil circuit and the other end of the second oil circuit is connected to the first working oil port of the hydraulic reversing valve; the other end of the first oil circuit and the other end of the second oil circuit is connected to the second working oil port of the hydraulic reversing valve.

2. The anti-cavitation liquid control system according to claim 1, characterized in that: Also includes: a fuel tank and a first liquid pump; The first end of the first liquid pump is communicated with the oil tank, the second end of the first liquid pump is communicated with the oil inlet of the hydraulic reversing valve, and the oil return port of the hydraulic reversing valve is communicated with the oil tank.

3. The anti-cavitation liquid control system according to claim 2, characterized in that: Also included: a second one-way valve; The second one-way valve is arranged on the oil path between the second end of the first liquid pump and the oil inlet of the hydraulic reversing valve.

4. The anti-cavitation liquid control system according to claim 2, characterized in that: Also includes: pilot oil circuit; The pilot oil circuit includes a second liquid pump and a pilot control valve; the first end of the second liquid pump is connected to the oil tank, and the second end of the second liquid pump is connected to the first end of the pilot control valve; the second end of the pilot control valve is connected to the first pilot end of the hydraulic reversing valve, and the third end of the pilot control valve is connected to the second pilot end of the hydraulic reversing valve; The pilot control valve has a first conducting state and a second conducting state; in the first conducting state, the first end and the second end of the pilot control valve are connected; in the second conducting state, the first end and the third end of the pilot control valve are connected.

5. The anti-cavitation hydraulic control system according to claim 4, characterized in that: It also includes: a first overflow valve; the first overflow valve is arranged between the second end of the first liquid pump and the oil tank; And / or, it also includes: a second overflow valve; the second overflow valve is arranged between the second end of the second liquid pump and the oil tank.

6. The anti-cavitation hydraulic control system according to claim 4, characterized in that: Also includes: Rotary drive mechanism; The first liquid pump and the second liquid pump are commonly connected to the rotation drive mechanism.

7. The anti-cavitation hydraulic control system according to any one of claims 1 to 6, characterized in that: The hydraulic actuator is any one of a hydraulic pump, a hydraulic motor and a hydraulic cylinder.

8. A working machine, characterized in that: It comprises the anti-cavitation liquid control system as claimed in any one of claims 1 to 7.

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