Winding balance valve, winding device and operation machine

Abstract

The invention relates to the technical field of engineering machinery, and discloses a winding balance valve, a winding device and an operation machine, a valve body is provided with a pilot port, a first oil port and a second oil port, the pilot port is communicated with a pilot oil way, the pilot oil way is suitable for driving a valve element of the valve body to be switched from a first valve position to a second valve position, and the valve element is switched to the second valve position from the first valve position when the valve element is in the first valve position. When the valve element is in the first valve position, the first oil port and the second oil port are blocked, and the first oil port and the second oil port are communicated when the valve element is in the second valve position; an inner cavity of the expansion cavity is slidably connected with a piston, the piston divides the inner cavity of the expansion cavity into a first cavity and a second cavity, an elastic piece is arranged in the expansion cavity, acts on the piston and has the trend of driving the piston to move from the second cavity to the first cavity, the second cavity is provided with a pressure relief opening, the first cavity of the expansion cavity is communicated with the pilot oil way, and the second cavity of the expansion cavity is communicated with the pilot oil way. According to the winch balance valve, the winch device and the operation machine, the problem that the hook falling stability is poor is solved or improved.

Description

Technical Field

[0001] The present application relates to the technical field of construction machinery, and particularly relates to a hoisting balance valve, a hoisting device, and a working machine. Background Art

[0002] A crane drives a hydraulic motor through a hydraulic system for hoisting to realize the rising and falling of a hook. The hydraulic oil in an oil tank forms high-pressure oil through a pressurizing pump, and the high-pressure oil drives the hydraulic motor to rotate to lift the hook. When lowering the hook, the hydraulic oil needs to return to the oil tank through a balance valve. The balance valve is provided with a first position and a second position, and pilot oil is used to drive a valve core to move between the first position and the second position. When the valve core is in the first position, the balance valve blocks the return of the hydraulic oil to the oil tank. When the valve core is in the second position, the hydraulic oil returns to the oil tank. During the process of the hydraulic oil returning to the oil tank, the hydraulic motor drives the hook to descend.

[0003] In the prior art, when the crane hydraulic system starts the hook-lowering operation, the oil pressure of the pilot oil is high, and the speed of pushing the valve core is too fast, resulting in too large an instantaneous flow rate of the hydraulic oil returning to the oil tank, causing a sudden hook lowering and reducing the stability of the system. Summary of the Invention

[0004] In view of this, the present application provides a hoisting balance valve, a hoisting device, and a working machine to solve or improve the problem of poor smoothness in starting the hook lowering.

[0005] In a first aspect, the present application provides a hoisting balance valve, including:

[0006] A valve body having a first valve position and a second valve position. The valve body is provided with a pilot port, a first oil port, and a second oil port. The pilot port is used to communicate with a pilot oil circuit, and the pilot oil circuit is adapted to drive the valve core of the valve body to switch from the first valve position to the second valve position. When the valve core is in the first valve position, the first oil port and the second oil port are blocked. When the valve core is in the second valve position, the first oil port and the second oil port are communicated;

[0007] An expansion cavity, the inner cavity of which is slidably connected with a piston. The piston divides the inner cavity of the expansion cavity into a first chamber and a second chamber. An elastic member is arranged in the expansion cavity. The elastic member acts on the piston and has a tendency to drive the piston to move from the second chamber to the first chamber. A pressure relief port is arranged in the second chamber. The first chamber of the expansion cavity is communicated with the pilot oil circuit to reduce the instantaneous impact of the pilot oil on the valve core.

[0008] In this embodiment, during the hook-lowering operation, the pilot oil enters the pilot port through the pilot oil passage. At the same time, the pilot oil enters the first chamber of the expansion cavity. The pilot oil does work on the piston, driving the piston to move from the first chamber towards the second chamber. The second chamber is provided with a pressure relief port, which releases the pressure exerted by the piston on the second chamber, and no resistance that hinders the piston from moving towards the second chamber is generated in the second chamber. After the pilot oil enters the first chamber, it overcomes the damping force of the elastic member and pushes the piston, increasing the space of the first chamber, playing a buffering role, capable of reducing the instantaneous pressure of the pilot oil on the valve core, preventing the valve core from being quickly switched from the first valve position to the second valve position, completely connecting the first oil port and the second oil port, thereby avoiding the situation that the hydraulic oil at the first oil port has too large an instantaneous flow rate through the second oil port, resulting in sudden hook lowering and reducing the system stability. After the first oil port and the second oil port are completely connected, the speed of hook lowering tends to be stable, and the elastic member can drive the piston to reset to the initial position.

[0009] In an alternative embodiment, a first oil passage is provided inside the valve body, and two ends of the first oil passage are respectively connected to the pilot oil passage and the first chamber;

[0010] A first damping valve is further included, and the first damping valve is arranged on the first oil passage.

[0011] In an alternative embodiment, a relief valve is further included, and the relief valve includes an elastic adjusting member for adjusting its relief pressure;

[0012] The inlet port of the relief valve is connected to the first oil passage, and the connection position is upstream of the first damping valve. The relief port of the relief valve is used for pressure relief.

[0013] In an alternative embodiment, the relief valve is provided with a relief pressure adjustment port, and the relief pressure adjustment port is connected to the first oil passage, and the connection position is downstream of the first damping valve;

[0014] The relief pressure of the relief valve is jointly adjusted by the inlet pressure of the relief pressure adjustment port and the elastic adjusting member.

[0015] In an alternative embodiment, a third oil port and a fourth oil port are provided on the valve body. The third oil port is used to communicate with the pilot oil passage, and the fourth oil port is connected to the pilot port;

[0016] Wherein, when the valve core is in the first valve position, the third oil port and the fourth oil port are connected. When the valve core is in the second valve position, the third oil port and the fourth oil port are blocked.

[0017] In an alternative embodiment, a fifth oil port and a sixth oil port are provided on the valve body. The fifth oil port is used to communicate with the pilot oil circuit, the sixth oil port is communicated with the pilot port, and the spool communicates the fifth oil port and the sixth oil port.

[0018] Wherein, a second damping valve is provided on the oil path between the fifth oil port and the sixth oil port.

[0019] In an alternative embodiment, a valve is further included. The oil inlet of the valve is used to communicate with the pilot oil circuit, and the oil outlet of the valve is communicated with the pilot port.

[0020] In an alternative embodiment, the valve body is provided with a second oil passage. The two ends of the second oil passage are respectively communicated with the first oil port and the second oil port.

[0021] A check valve is provided on the second oil passage. The check valve communicates the second oil passage along the direction from the second oil port to the first oil port.

[0022] In a second aspect, the present application further provides a hoisting device, including:

[0023] The hoisting balance valve;

[0024] An oil tank;

[0025] A first oil circuit and a second oil circuit. One end of the first oil circuit is communicated with the oil tank, and the other end is communicated with the second oil port. One end of the second oil circuit is communicated with the first oil port, and the other end is communicated with the oil tank.

[0026] A hydraulic motor, which is connected to the first oil circuit or the second oil circuit.

[0027] In a third aspect, the present application further provides a working machine, including: the hoisting balance valve, or the hoisting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 It is a working principle diagram of a hoisting balance valve according to an embodiment of the present application.

[0030] Explanation of the reference numerals:

[0031] 1. Valve body; 101. First valve position; 102. Second valve position; 103. Pilot port; 104. First oil port; 105. Second oil port; 106. Third oil port; 107. Fourth oil port; 108. Fifth oil port; 109. Sixth oil port; 2. Pilot oil circuit; 3. Expansion cavity; 301. Piston; 302. First chamber; 303. Second chamber; 304. Elastic member; 305. Pressure relief port; 4. First oil passage; 5. First damping valve; 6. Relief valve; 601. Elastic adjustment member; 602. Relief pressure adjustment port; 7. Second damping valve; 8. Second oil passage; 9. Check valve; 10. First oil circuit; 11. Second oil circuit. Detailed implementation manners

[0032] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0033] The crane drives the hydraulic motor through the hydraulic system to perform hoisting, realizing the lifting and lowering of the hook. The hydraulic oil in the fuel tank forms high-pressure oil through the pressure pump, and the high-pressure oil drives the hydraulic motor to rotate to lift the hook. When lowering the hook, the hydraulic oil needs to return to the fuel tank through the balance valve. The balance valve is provided with a first position and a second position, and the pilot oil is used to drive the spool to move between the first position and the second position. When the spool is in the first position, the balance valve blocks the hydraulic oil from returning to the fuel tank. When the spool is in the second position, the hydraulic oil returns to the fuel tank. During the process of the hydraulic oil returning to the fuel tank, the hydraulic motor drives the hook to lower.

[0034] In the prior art, when the crane hydraulic system starts the hook-lowering operation, the oil pressure of the pilot oil is high, and the speed of pushing the spool is too fast, resulting in too large an instantaneous flow rate of the hydraulic oil returning to the fuel tank, causing a sudden hook-lowering and reducing the stability of the system. To solve or improve the problem of poor smoothness of hook-lowering start, the present application provides a hoisting balance valve, a hoisting device and a working machine.

[0035] The following Figure 1 is used to describe the embodiments of the present application.

[0036] According to an embodiment of the present application, on the one hand, a hoisting balance valve is provided, including: a valve body 1 and an expansion cavity 3.

[0037] Specifically, the valve body 1 has a first valve position 101 and a second valve position 102. The valve body 1 is provided with a pilot port 103, a first oil port 104 and a second oil port 105. The pilot port 103 is used to communicate with the pilot oil circuit 2, and the pilot oil circuit 2 is adapted to drive the spool of the valve body 1 to switch from the first valve position 101 to the second valve position 102. When the spool is in the first valve position 101, the first oil port 104 and the second oil port 105 are blocked. When the spool is in the second valve position 102, the first oil port 104 and the second oil port 105 are communicated with each other;

[0038] A piston 301 is slidably connected to the inner cavity of the expansion cavity 3. The piston 301 divides the inner cavity of the expansion cavity 3 into a first chamber 302 and a second chamber 303. An elastic member 304 is arranged in the expansion cavity 3. The elastic member 304 acts on the piston 301 and has a tendency to drive the piston 301 to move from the second chamber 303 to the first chamber 302. A pressure relief port 305 is arranged in the second chamber 303. The first chamber 302 of the expansion cavity 3 is communicated with the pilot oil circuit 2 to reduce the instantaneous impact of the pilot oil on the spool.

[0039] In this embodiment, during the hook lowering operation, the pilot oil enters the pilot port 103 through the pilot oil circuit 2. At the same time, the pilot oil enters the first chamber 302 of the expansion cavity 3. The pilot oil does work on the piston 301 and drives the piston 301 to move from the first chamber 302 to the second chamber 303. The second chamber 303 is provided with a pressure relief port 305, and the pressure relief port 305 releases the pressure exerted by the piston 301 on the second chamber 303, and no resistance that hinders the piston 301 from moving to the second chamber 303 is generated in the second chamber 303. After the pilot oil enters the first chamber 302, it overcomes the damping force of the elastic member 304 and pushes the piston 301. The space of the first chamber 302 increases, playing a buffering role, which can reduce the instantaneous pressure or instantaneous impact of the pilot oil on the spool, and avoid the spool being quickly switched from the first valve position 101 to the second valve position 102, completely communicating the first oil port 104 and the second oil port 105. Furthermore, it can avoid the hydraulic oil at the first oil port 104 having too large an instantaneous flow rate through the second oil port 105, resulting in sudden hook lowering, reducing the system stability and other adverse situations, improving the smoothness of the hook lowering start, making the hook lowering without impact noise, and being able to reduce the noise of the valve body 1. After the first oil port 104 and the second oil port 105 are completely communicated, the speed of the hook lowering tends to be stable, and the elastic member 304 can drive the piston 301 to reset to the initial position.

[0040] Specifically, the elastic member 304 can be set as a spring, a spring sheet or other elastic structural members.

[0041] It should be noted that the spring can be arranged in the first chamber 302 or the second chamber 303. When the spring is arranged in the first chamber 302, one end is connected to the chamber wall of the first chamber 302, and the other end is connected to the piston 301. When the pilot oil enters the first chamber 302, the piston 301 moves towards the second chamber 303, the spring stretches, the volume of the first chamber 302 expands, playing a buffering role, which can reduce the instantaneous pressure or instantaneous impact of the pilot oil on the valve core, prevent the valve core from being quickly switched from the first valve position 101 to the second valve position 102 by the pilot oil, completely connect the first oil port 104 and the second oil port 105, and further avoid the situation that the hydraulic oil at the first oil port 104 has too large an instantaneous flow rate through the second oil port 105, resulting in sudden hook drop and reducing the system stability. It improves the smoothness of the hook drop start, makes the hook drop without impact noise, and can reduce the noise of the valve body 1.

[0042] In another embodiment, as Figure 1 shown, when the spring is arranged in the second chamber 303, one end is connected to the chamber wall of the second chamber 303, and the other end is connected to the piston 301. When the pilot oil enters the first chamber 302, the piston 301 moves towards the second chamber 303, compressing the spring, the volume of the first chamber 302 expands, playing a buffering role, which can reduce the instantaneous pressure or instantaneous impact of the pilot oil on the valve core.

[0043] In one embodiment, a first oil passage 4 is arranged inside the valve body 1, and both ends of the first oil passage 4 are respectively connected to the pilot oil passage 2 and the first chamber 302;

[0044] A first damping valve 5 is further included, and the first damping valve 5 is arranged on the first oil passage 4.

[0045] In this embodiment, the pilot oil passage 2 is communicated with the first chamber 302 through the first oil passage 4, and the first damping valve 5 is arranged on the first oil passage 4, which can slow down the flow rate of the pilot oil on the first oil passage 4 and the speed of the pilot oil entering the first chamber 302 body, and avoid the impact of the pilot oil on the piston 301.

[0046] In one embodiment, a relief valve 6 is further included, and the relief valve 6 includes an elastic adjusting member 601 for adjusting its relief pressure;

[0047] The inlet of the relief valve 6 is communicated with the first oil passage 4, and the communication position is upstream of the first damping valve 5, and the relief port of the relief valve 6 is used for pressure relief.

[0048] In this embodiment, the pilot oil is communicated with the oil inlet of the overflow valve 6 through the first oil passage 4, and the pressure of the pilot oil entering the first chamber 302 is adjusted by the overflow valve 6. When the oil pressure of the pilot oil is too high, the oil pressure of the pilot oil is first adjusted by the overflow valve 6 to adjust the oil pressure of the pilot oil to a preset value, and then through the expansion effect of the first chamber 302, the pressure of the pilot oil acting on the valve core is further adjusted, which can reduce the instantaneous pressure or instantaneous impact of the pilot oil on the valve core, avoid the valve core being quickly switched from the first valve position 101 to the second valve position 102 by the pilot oil, and completely communicate the first oil port 104 with the second oil port 105. Furthermore, it can avoid the instantaneous flow rate of the hydraulic oil at the first oil port 104 passing through the second oil port 105 being too large, resulting in sudden hook drop and reducing the stability of the system and other adverse situations.

[0049] In one embodiment, the overflow valve 6 is provided with an overflow pressure adjustment port 602, and the overflow pressure adjustment port 602 is communicated with the first oil passage 4, and the communication position is located downstream of the first damping valve 5;

[0050] The overflow pressure of the overflow valve 6 is jointly adjusted by the inlet oil pressure of the overflow pressure adjustment port 602 and the elastic adjustment member 601.

[0051] In this embodiment, the first oil passage 4 is communicated with the overflow pressure adjustment port 602 of the overflow valve 6 on the downstream side of the first damping valve 5, and the pressure in the first oil passage 4 and the elastic adjustment member 601 jointly adjust the overflow pressure of the overflow valve 6. The pilot oil enters the first oil passage 4, first passes through the overflow valve 6, and then passes through the first damping valve 5 and enters the overflow pressure adjustment port 602. Therefore, the pressure of the pilot oil is first adjusted by the pressure set by the elastic adjustment member 601 in the overflow valve 6. As the flow rate of the pilot oil passing through the first damping valve 5 increases, the oil pressure of the pilot oil after the first damping valve 5 and the oil pressure set by the elastic adjustment member 601 jointly adjust the overflow pressure, forming a dynamic adjustment, and the adjustment of the oil pressure of the pilot oil is more stable.

[0052] The overflow pressure of the overflow valve 6 is jointly adjusted by the inlet oil pressure of the overflow pressure adjustment port 602 and the elastic adjustment member 601, which can prevent the problem of excessive pressure impact when the pilot oil passage 2 is connected instantaneously. At the same time, it can prevent excessive pressure relief of the pilot oil in the pilot oil passage 2, making it impossible to quickly and stably push the valve core to move and realize the communication between the first oil port 104 and the second oil port 105.

[0053] It should be noted that when the hook drops, the overflow valve 6 guides the excess flow to unload the load, preventing the system pressure from surging, so as to achieve the effects of stabilizing pressure and preventing vibration and reducing the hook drop impact.

[0054] In one embodiment, a third oil port 106 and a fourth oil port 107 are provided on the valve body 1. The third oil port 106 is used to communicate with the pilot oil passage 2, and the fourth oil port 107 is communicated with the pilot port 103;

[0055] When the spool is in the first valve position 101, the third oil port 106 and the fourth oil port 107 are connected. When the spool is in the second valve position 102, the connection between the third oil port 106 and the fourth oil port 107 is blocked.

[0056] In this embodiment, when the spool is in the first valve position 101, the pilot oil in the pilot oil circuit 2 is simultaneously connected to both the third oil port 106 and the pilot port 103. The pilot oil enters from the third oil port 106 and is output from the fourth oil port 107 to the pilot port 103, jointly pushing the spool to switch from the first valve position 101 to the second valve position 102, thereby diverting the pilot oil in the pilot oil circuit 2 and reducing the situation where all the pilot oil in the pilot oil circuit 2 directly enters the pilot port 103, and reducing the instantaneous pressure or instantaneous impact of the pilot oil on the spool.

[0057] When the spool is in the second valve position 102, the connection between the third oil port 106 and the fourth oil port 107 is blocked, and the pilot oil exerts pressure on the spool, improving the stability of the pressure of the pilot oil on the spool and maintaining the connection between the first oil port 104 and the second oil port 105.

[0058] In one embodiment, a fifth oil port 108 and a sixth oil port 109 are provided on the valve body 1. The fifth oil port 108 is used to communicate with the pilot oil circuit 2, the sixth oil port 109 is connected to the pilot port 103, and the spool connects the fifth oil port 108 and the sixth oil port 109.

[0059] Wherein, a second damping valve 7 is provided on the oil path between the fifth oil port 108 and the sixth oil port 109.

[0060] In this embodiment, when the spool is in the first valve position 101, the pilot oil in the pilot oil circuit 2 is simultaneously connected to both the fifth oil port 108 and the pilot port 103. The pilot oil enters from the fifth oil port 108 and is output from the sixth oil port 109 to the pilot oil, jointly pushing the spool to switch from the first valve position 101 to the second valve position 102, thereby diverting the pilot oil in the pilot oil circuit 2 and reducing the situation where all the pilot oil in the pilot oil circuit 2 directly enters the pilot port 103, and reducing the instantaneous pressure or instantaneous impact of the pilot oil on the spool.

[0061] When the spool is in the second valve position 102, the fifth oil port 108 and the sixth oil port 109 are connected, and the pilot oil exerts pressure on the spool, improving the stability of the pressure of the pilot oil on the spool and maintaining the connection between the first oil port 104 and the second oil port 105.

[0062] In one embodiment, a valve is further included. The oil inlet of the valve is used to communicate with the pilot oil circuit 2, and the oil outlet of the valve is connected to the pilot port 103.

[0063] In this embodiment, when the hook needs to be lowered, the valve is opened so that the pilot oil in the pilot oil circuit 2 enters the valve body 1.

[0064] In an alternative embodiment, the valve body 1 is provided with a second oil passage 8, and both ends of the second oil passage 8 are respectively communicated with the first oil port 104 and the second oil port 105;

[0065] A check valve 9 is provided on the second oil passage 8, and the check valve 9 communicates with the second oil passage 8 in the direction from the second oil port 105 to the first oil port 104.

[0066] In this embodiment, when lifting the hook, the high-pressure oil passes through the second oil passage 8 and is transported from the second oil port 105 to the first oil port 104 to realize lifting the hook. A check valve 9 is provided on the second oil passage 8, and the hydraulic oil in the second oil passage 8 can only be transported from the second oil port 105 to the first oil port 104, preventing the hydraulic oil from flowing back from the first oil port 104 to the second oil port 105 through the second oil passage 8 and avoiding the phenomenon of the hook dropping. When the hydraulic oil flows through the valve core from the first oil port 104 and flows out from the second oil port 105, the hook dropping operation can be carried out.

[0067] According to an embodiment of the present application, on the other hand, a hoisting device is further provided, including:

[0068] A hoisting balance valve;

[0069] A fuel tank;

[0070] A first oil passage 10 and a second oil passage 11, one end of the first oil passage 10 is communicated with the fuel tank, the other end is communicated with the second oil port 105, one end of the second oil passage 11 is communicated with the first oil port 104, and the other end is communicated with the fuel tank;

[0071] A hydraulic motor, which is communicated with the first oil passage 10 or the second oil passage 11.

[0072] In this embodiment, the hydraulic oil on the first oil passage 10 is pressurized by a pressure pump, the hydraulic oil in the first oil passage 10 is input into the second oil port 105, then passes through the check valve 9, is output from the first oil port 104, and returns to the fuel tank through the second oil passage 11 to form a closed loop. The hydraulic motor is communicated with the first oil passage 10, the hydraulic oil output from the first oil port 104 is communicated with the fuel tank, the hydraulic motor rotates forward, and the load is hoisted to a preset height to complete the hook lifting operation.

[0073] There is a load on the hook, and the hydraulic oil has a tendency to flow from the first oil port 104 to the second oil port 105. Due to the function of the check valve 9, the hydraulic oil can only return to the fuel tank when the valve core communicates the first oil port 104 and the second oil port 105.

[0074] According to an embodiment of the present application, on the other hand, a working machine is further provided, including: a hoisting balance valve, or a hoisting device.

[0075] The construction machine includes a hoisting balance valve or a hoisting device. Therefore, the construction machine has the same technical effects as the hoisting balance valve or the hoisting device, which will not be elaborated here.

[0076] The following takes an embodiment to comprehensively elaborate on all the above solutions in conjunction with Figure 1 the above-mentioned all solutions.

[0077] The hydraulic motor is provided with a first port and a second port. When hydraulic oil enters from the first port and is output from the second port, the hydraulic motor rotates forward to perform hook lifting. When the hydraulic oil flows back from the second port to the first port for output, the hydraulic motor rotates in reverse to perform hook lowering.

[0078] The hydraulic oil on the first oil circuit 10 is pressurized by a pressure pump. The hydraulic oil in the first oil circuit 10 is input into the second oil port 105, and then passes through a check valve 9 and is output from the first oil port 104, and returns to the oil tank through the second oil circuit 11 to form a closed loop. The hydraulic motor is connected to the first oil circuit 10. The hydraulic oil output from the first oil port 104 is connected to the oil tank, and the hydraulic motor rotates forward to hoist the load to a preset height to complete the hook lifting operation.

[0079] When there is a load on the hook, the hydraulic oil has a tendency to flow from the second port to the first port of the hydraulic motor, that is, from the first oil port 104 to the second oil port 105. Due to the function of the check valve 9, the hydraulic oil can only return to the oil tank when the valve core connects the first oil port 104 and the second oil port 105.

[0080] During the hook lowering operation, the valve is opened to allow the pilot oil in the pilot oil circuit 2 to enter the valve body 1. The relief valve 6 relieves the pressure of the pilot oil to prevent the pressure of the pilot oil on the valve core from being too large instantaneously, avoiding the valve core being quickly switched from the first valve position 101 to the second valve position 102, completely connecting the first oil port 104 and the second oil port 105, and further avoiding the instantaneous flow rate of the hydraulic oil at the first oil port 104 through the second oil port 105 from being too large, resulting in sudden hook lowering and reducing the stability of the system and other adverse situations. Improve the smooth start of hook lowering.

[0081] Although the embodiments of the present application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations all fall within the scope defined by the appended claims of the present application.

Claims

1. A winch balancing valve, characterized in that: include: A valve body (1) having a first valve position (101) and a second valve position (102), the valve body (1) being provided with a pilot port (103), a first oil port (104) and a second oil port (105), the pilot port (103) being used to communicate with a pilot oil circuit (2), and the pilot oil circuit (2) being suitable for driving a valve core of the valve body (1) to switch from the first valve position (101) to the second valve position (102), the valve core blocking the first oil port (104) and the second oil port (105) when in the first valve position (101), and connecting the first oil port (104) and the second oil port (105) when in the second valve position (102); An expansion chamber (3) has an inner chamber slidably connected to a piston (301), the piston (301) dividing the inner chamber of the expansion chamber (3) into a first chamber (302) and a second chamber (303), an elastic member (304) is arranged in the expansion chamber (3), the elastic member (304) acts on the piston (301) and has a tendency to drive the piston (301) to move from the second chamber (303) to the first chamber (302), the second chamber (303) is provided with a pressure relief port (305), and the first chamber (302) of the expansion chamber (3) is connected to the pilot oil circuit (2) to reduce the instantaneous impact of the pilot oil on the valve core.

2. The hoisting balance valve according to claim 1, characterized in that: A first oil passage (4) is provided inside the valve body (1), and two ends of the first oil passage (4) are respectively connected to the pilot oil circuit (2) and the first chamber (302); It also comprises a first damping valve (5), wherein the first damping valve (5) is arranged on the first oil passage (4).

3. The hoisting balance valve according to claim 2, characterized in that: It also includes a relief valve (6), wherein the relief valve (6) includes an elastic adjustment member (601) for adjusting its relief pressure; The oil inlet of the overflow valve (6) is connected to the first oil channel (4), and the connecting position is located upstream of the first damping valve (5). The overflow port of the overflow valve (6) is used for pressure relief.

4. The hoisting balancing valve according to claim 3 is characterized in that: The overflow valve (6) is provided with an overflow pressure regulating port (602), the overflow pressure regulating port (602) is communicated with the first oil passage (4), and the communication position is located downstream of the first damping valve (5); The overflow pressure of the overflow valve (6) is adjusted by the oil inlet pressure of the overflow pressure regulating port (602) and the elastic regulating member (601).

5. The hoisting balancing valve according to any one of claims 1 to 4, characterized in that: The valve body (1) is provided with a third oil port (106) and a fourth oil port (107), the third oil port (106) being used to communicate with the pilot oil circuit (2), and the fourth oil port (107) being communicated with the pilot port (103); When the valve core is located at the first valve position (101), the third oil port (106) and the fourth oil port (107) are connected; when the valve core is located at the second valve position (102), the third oil port (106) and the fourth oil port (107) are blocked.

6. The hoisting balancing valve according to any one of claims 1 to 4, characterized in that: The valve body (1) is provided with a fifth oil port (108) and a sixth oil port (109), the fifth oil port (108) being used to communicate with the pilot oil circuit (2), the sixth oil port (109) being communicated with the pilot port (103), and the valve core being in communication with the fifth oil port (108) and the sixth oil port (109); Wherein, a second damping valve (7) is arranged on the oil circuit between the fifth oil port (108) and the sixth oil port (109).

7. The hoisting balancing valve according to any one of claims 1 to 4, characterized in that: It also comprises a valve, wherein the oil inlet of the valve is used to communicate with the pilot oil circuit (2), and the oil outlet of the valve is communicated with the pilot port (103).

8. The hoisting balancing valve according to any one of claims 1 to 4, characterized in that: The valve body (1) is provided with a second oil passage (8), and two ends of the second oil passage (8) are respectively connected to the first oil port (104) and the second oil port (105); A one-way valve (9) is provided on the second oil passage (8), and the one-way valve (9) is connected to the second oil passage (8) in a direction from the second oil port (105) to the first oil port (104).

9. A hoisting device, characterized in that: include: The winch balancing valve according to any one of claims 1 to 8; tank; A first oil circuit (10) and a second oil circuit (11), wherein one end of the first oil circuit (10) is connected to the oil tank, and the other end is connected to the second oil port (105); one end of the second oil circuit (11) is connected to the first oil port (104), and the other end is connected to the oil tank; A hydraulic motor is connected to the first oil circuit (10) or the second oil circuit (11).

10. A working machine, characterized in that: It comprises the hoisting balance valve according to any one of claims 1 to 8, or the hoisting device according to claim 9.

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