Luffing control system and operation machine

Abstract

This application relates to the field of hydraulic systems, and provides a variable-amplitude control system and an operation machine. The variable-amplitude control system includes: a counterbalance valve configured to be connected to an actuator, where the counterbalance valve includes a first control port and a second control port, a return oil opening degree of the counterbalance valve is directly proportional to a difference between an oil pressure of the second control port and an oil pressure of the first control port, and the second control port is connected to an oil port of the counterbalance valve; and a first adjustable damper and a second adjustable damper connected in series and arranged in parallel to the counterbalance valve, where the first control port is connected to an oil passage between the first adjustable damper and the second adjustable damper, and a valve spool of the first adjustable damper is linked to a valve spool of the counterbalance valve to enable an opening degree of the first adjustable damper to vary with the return oil opening degree of the counterbalance valve. The opening degree of the counterbalance valve is adjusted through the cooperation of the first adjustable damper and the second adjustable damper, and through the linkage between the first adjustable damper and the counterbalance valve, frequent flow rate variations in the counterbalance valve caused by pressure fluctuations are mitigated, thereby mitigating the jitter problem.

Description

Cross Reference to Related Applications

[0001] This application claims priority to Chinese patent application No. 202410218447.X, filed on February 28, 2024, and entitled "VARIABLE-AMPLITUDE CONTROL SYSTEM AND OPERATION MACHINE", which is incorporated herein by reference in its entirety.Technical Field

[0002] This application relates to the technical field of hydraulic systems, and in particular, to a variable-amplitude control system and an operation machine.Background

[0003] In the aerial operation field, aerial operation machines usually require a hydraulic cylinder, a hydraulic motor, or another actuator to perform lifting and lowering actions, and the actuator typically requires a counterbalance valve to control the lowering speed.

[0004] Referring to FIG. 2, a counterbalance valve 1' in related technologies is typically controlled by externally controlled pilot oil. For example, in a lowering state, an oil return port of the actuator is connected to an oil tank by the counterbalance valve 1', and a pilot oil port of the counterbalance valve 1' is connected to an oil inlet chamber 201' of an actuator 2'. When pressurized oil supplied by an oil pump flows to the oil inlet chamber 201' of the actuator 2', part of the pressurized oil enters the pilot oil port of the counterbalance valve 1' to drive the counterbalance valve 1' to open, so that pressurized oil at the oil return port of the actuator 2' flows out through the counterbalance valve 1' and the actuator 2' performs a lowering action.

[0005] The inventor finds that during the use of the foregoing counterbalance valve, when pressure fluctuations occur in the oil inlet chamber of the actuator, such pressure fluctuations are transferred to the counterbalance valve, and the opening degree of the counterbalance valve varies frequently, causing the jitter of the actuator.Summary of the Invention

[0006] This application provides a variable-amplitude control system and an operation machine, to solve the disadvantage that a counterbalance valve causes the jitter of an actuator in related technologies, thereby stabilizing and adjusting the counterbalance valve.

[0007] This application provides a variable-amplitude control system, including: a counterbalance valve used for connecting an actuator and enabling the actuator to return oil, where the counterbalance valve includes a first control port and a second control port, a return oil opening degree of the counterbalance valve is directly proportional to a difference between an oil pressure of the second control port and an oil pressure of the first control port, and the second control port is connected to an oil port of the counterbalance valve that is connected to the actuator; and a first adjustable damper and a second adjustable damper connected in series and arranged in parallel to the counterbalance valve, where the first control port is connected to an oil passage between the first adjustable damper and the second adjustable damper, and a valve spool of the first adjustable damper is linked to a valve spool of the counterbalance valve to enable an opening degree of the first adjustable damper to vary with the return oil opening degree of the counterbalance valve.

[0008] According to the variable-amplitude control system provided in this application, the valve spool of the counterbalance valve is connected to the valve spool of the first adjustable damper.

[0009] According to the variable-amplitude control system provided in this application, the system further includes a position detection apparatus, where the position detection apparatus is configured to detect position information of the valve spool of the counterbalance valve, the first adjustable damper is configured as an electro-proportional valve, both the first adjustable damper and the position detection apparatus are connected to a control component of the variable-amplitude control system, and the control component is configured to adjust a position of the valve spool of the first adjustable damper based on the position information.

[0010] According to the variable-amplitude control system provided in this application, the system further includes an instruction acquisition assembly, where the second adjustable damper is configured as an electro-proportional valve, both the instruction acquisition assembly and the second adjustable damper are connected to a control component of the variable-amplitude control system, the instruction acquisition assembly is configured to acquire an operation instruction, and the control component is configured to adjust an opening degree of the second adjustable damper based on the operation instruction.

[0011] According to the variable-amplitude control system provided in this application, the second adjustable damper is configured as a hydraulically-controlled valve with an opening degree that is adjustable by control oil.

[0012] According to the variable-amplitude control system provided in this application, the second adjustable damper is configured as a manually-adjustable valve with an opening degree that is adjustable manually.

[0013] According to the variable-amplitude control system provided in this application, the system further includes a first fixed damper, where the first adjustable damper, the second adjustable damper, and the first fixed damper are sequentially connected in series and are connected in parallel to the counterbalance valve.

[0014] According to the variable-amplitude control system provided in this application, the system further includes a second fixed damper, where the second control port, corresponding to a second operating position, is connected via the second fixed damper to the oil port of the counterbalance valve that is connected to the actuator.

[0015] According to the variable-amplitude control system provided in this application, the system further includes a third fixed damper, where the oil passage between the first adjustable damper and the second adjustable damper is connected to the first control port, corresponding to a first operating position, via the third fixed damper.

[0016] This application further provides an operation machine, including an actuator and the variable-amplitude control system as described above.

[0017] For the variable-amplitude control system provided in this application, the counterbalance valve is connected to the actuator, and through the control of a pressure difference between the first control port and the second control port, oil of the actuator is discharged and returns to perform a lowering action, or oil of the actuator is restricted from being discharged to stop a lowering action.

[0018] The first adjustable damper and the second adjustable damper are connected in series and are connected in parallel to the counterbalance valve, so that when lowering is required, the second adjustable damper is controlled to be turned on, and part of the oil of the actuator is discharged through the first adjustable damper and the second adjustable damper. Because a pressure loss occurs when the oil flows through the first adjustable damper, the pressure of the second control port is greater than the pressure of the first control port, and the opening degree of the counterbalance valve increases to enable the oil of the actuator to be discharged through the counterbalance valve to return, and the actuator performs a lowering action.

[0019] The valve spool of the first adjustable damper is linked to the valve spool of the counterbalance valve. When a pressure fluctuation of the oil of the actuator increases, the pressure of the second control port increases, and the return oil opening degree of the counterbalance valve increases. In this case, the opening degree of the first adjustable damper increases simultaneously, making the pressure of the first control port increase correspondingly, so that the pressure difference between the first control port and the second control port is reduced, thereby making the return oil opening degree of the counterbalance valve return to the original state. Similarly, when the pressure fluctuation of the oil of the actuator decreases, the opening degree of the first adjustable damper decreases, and the pressure difference between the first control port and the second control port can also be reduced, so that the return oil opening degree of the counterbalance valve returns to the original state, thereby ensuring the stability of the return oil opening degree of the counterbalance valve.

[0020] With such an arrangement, for the variable-amplitude control system provided in this application, through the cooperation of the first adjustable damper and the second adjustable damper, the opening degree of the counterbalance valve is adjusted, and the first adjustable damper is linked to the counterbalance valve, so that frequent flow rate variations in the counterbalance valve caused by pressure fluctuations are mitigated, thereby ensuring stable lowering of the actuator, and mitigating the problem of jitter.

[0021] The operation machine provided in this application includes the variable-amplitude control system provided in this application, and therefore has all the foregoing advantages of the variable-amplitude control system.Brief description of the drawings

[0022] To describe the technical solutions in this application or the related art more clearly, the following briefly introduces the accompanying drawings required for describing the embodiments or the related art. Apparently, the accompanying drawings in the following description show some embodiments of this application, and persons of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts. FIG. 1 is a schematic structural diagram of a variable-amplitude control system according to some embodiments of this application; and FIG. 2 is a schematic structural diagram of a counterbalance valve in related technologies.

[0023] Reference numerals: 1. counterbalance valve; 101. first control port; 102. second control port; 103. first oil port; 104. second oil port; 105. first elastic member; 2. actuator; 3. first adjustable damper; 4. second adjustable damper; 401. third oil port; 402. fourth oil port; 403. second elastic member; 5. first fixed damper; 6. second fixed damper; and 7. third fixed damper; and 1'. counterbalance valve; 2'. actuator; and 201'. oil inlet chamber. Detailed Description

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the following clearly and completely describes the technical solutions in this application with reference to the accompanying drawings in this application. It is clear that the described embodiments are merely some rather than all of the embodiments of this application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of this application without creative efforts fall within the protection scope of this application.

[0025] A variable-amplitude control system provided in embodiments of this application is described below with reference to FIG. 1.

[0026] Specifically, the variable-amplitude control system includes a counterbalance valve 1, a first adjustable damper 3, and a second adjustable damper 4.

[0027] The counterbalance valve 1 is configured to be connected to an actuator 2 and can enable the actuator 2 to return oil. Optionally, the actuator 2 may be a hydraulic cylinder. The counterbalance valve 1 is connected to a rodless chamber of the hydraulic cylinder. During lowering, oil in the rodless chamber of the hydraulic cylinder is discharged through the counterbalance valve 1. Certainly, the actuator 2 may alternatively be a hydraulic motor. During lowering, oil discharged by the hydraulic motor is discharged through the counterbalance valve 1.

[0028] The counterbalance valve 1 includes a first control port 101 and a second control port 102, and both the first control port 101 and the second control port 102 are configured to be connected to control oil to enable the control oil to drive a valve spool of the counterbalance valve 1 to move, thereby adjusting a return oil opening degree of the counterbalance valve 1. The return oil opening degree of the counterbalance valve 1 is directly proportional to a difference between an oil pressure of the second control port 102 and an oil pressure of the first control port 101. That is, when the difference between the oil pressure of the second control port 102 and the oil pressure of the first control port 101 is larger, the return oil opening degree of the counterbalance valve 1 is larger, and a return oil speed of the actuator 2 is higher, so that a lowering action of the actuator 2 is faster. When the oil pressure of the first control port 101 is greater than or equal to the oil pressure of the second control port 102, the return oil opening degree of the counterbalance valve 1 is zero.

[0029] Optionally, the counterbalance valve 1 further includes a first oil port 103, a second oil port 104, a first elastic member 105, and a valve spool. The first oil port 103 is configured to be connected to the actuator 2, and the second oil port 104 is selectively connected to an oil pump or an oil tank of an operation machine through a directional control valve. The first elastic member 105 is configured to drive the valve spool of the counterbalance valve 1 to move in a direction of reducing the return oil opening degree. When the oil pressure of the first control port 101 is greater than or equal to the oil pressure of the second control port 102, the valve spool of the counterbalance valve 1 moves to a first operating position to allow one-way flow from the second oil port 104 to the first oil port 103 and cut off flow from the first oil port 103 to the second oil port 104. The one-way flow from the second oil port 104 to the first oil port 103 enables oil of the oil pump to pass through the counterbalance valve 1 to enter the actuator 2, to drive the actuator 2 to perform a lifting operation, and the cut-off from the first oil port 103 to the second oil port 104 can restrict oil of the actuator 2 from being discharged through the counterbalance valve 1. When a sum of the oil pressure of the first control port 101 and a pressure generated by the first elastic member 105 is less than the oil pressure of the second control port 102, the valve spool of the counterbalance valve 1 moves to a second operating position to connect the first oil port 103 and the second oil port 104, so that the actuator 2 can return oil through the counterbalance valve 1 to enable the actuator 2 to perform a lowering operation.

[0030] The first adjustable damper 3 and the second adjustable damper 4 are connected in series and are arranged in parallel to the counterbalance valve 1. Specifically, an end of the first adjustable damper 3 that is away from the second adjustable damper 4 is connected to the first oil port 103, and an end of the second adjustable damper 4 that is away from the first adjustable damper 3 is connected to the second oil port 104. The first control port 101 is connected to an oil passage between the first adjustable damper 3 and the second adjustable damper 4. A valve spool of the first adjustable damper 3 is linked to the valve spool of the counterbalance valve 1 to enable an opening degree of the first adjustable damper 3 to vary with the return oil opening degree of the counterbalance valve 1. Optionally, to make the variable-amplitude control system run more smoothly, when the return oil opening degree of the counterbalance valve 1 is zero, the first adjustable damper 3 maintains a preset opening degree.

[0031] The principle of the variable-amplitude control system is described below with reference to FIG. 1. For ease of description, a hydraulic cylinder is used as an example, and the same principle applies to the actuator 2 configured as a hydraulic motor.

[0032] When the second adjustable damper 4 is fully closed, the pressure of the first control port 101 is equal to the pressure of the second control port 102, the valve spool of the counterbalance valve 1 is at the first operating position, the return oil opening degree of the counterbalance valve 1 is zero, the oil in the rodless chamber of the hydraulic cylinder cannot return, and the hydraulic cylinder does not perform a lowering action.

[0033] When the hydraulic cylinder requires lowering, the second adjustable damper 4 is controlled to be turned on. In this case, part of the oil in the hydraulic cylinder is discharged through the first adjustable damper 3 and the second adjustable damper 4 to return. A pressure loss occurs when the oil flows through the first adjustable damper 3, so that the pressure of the second control port 102 is greater than the pressure of the first control port 101, and the valve spool of the counterbalance valve 1 moves to the second operating position to enable the oil of the actuator 2 to be discharged through the counterbalance valve 1 to return, and the hydraulic cylinder performs a lowering action. When the opening degree of the second adjustable damper 4 decreases, a pressure difference between two ends of the second adjustable damper 4 increases, and the pressure of the first control port 101 increases, so that the difference between the oil pressure of the second control port 102 and the oil pressure of the first control port 101 decreases, the return oil opening degree of the counterbalance valve 1 decreases, and the lowering speed of the hydraulic cylinder decreases. When the opening degree of the second adjustable damper 4 increases, the pressure difference between two ends of the second adjustable damper 4 decreases, and the pressure of the first control port 101 decreases, so that the difference between the oil pressure of the second control port 102 and the oil pressure of the first control port 101 increases, the return oil opening degree of the counterbalance valve 1 increases, and the lowering speed of the hydraulic cylinder increases.

[0034] When the pressure of the oil of the hydraulic cylinder increases suddenly, the pressure of the second control port 102 increases, the difference between the pressure of the second control port 102 and the pressure of the first control port 101 increases, and the return oil opening degree of the counterbalance valve 1 increases. Because the valve spool of the first adjustable damper 3 is linked to the valve spool of the counterbalance valve 1, the opening degree of the first adjustable damper 3 increases simultaneously, making the pressure of the first control port 101 increase correspondingly, so that the pressure difference between the first control port 101 and the second control port 102 is reduced, thereby making the return oil opening degree of the counterbalance valve 1 return to the original state. Similarly, when the pressure fluctuation of the oil of the hydraulic cylinder decreases, the opening degree of the first adjustable damper 3 decreases, and the pressure difference between the first control port 101 and the second control port 102 can also be reduced, so that the return oil opening degree of the counterbalance valve 1 returns to the original state, thereby ensuring the stability of the return oil opening degree of the counterbalance valve 1.

[0035] With such an arrangement, for the variable-amplitude control system provided in the embodiments of this application, through the cooperation of the first adjustable damper 3 and the second adjustable damper 4, the opening degree of the counterbalance valve 1 is adjusted, and the first adjustable damper 3 is linked to the counterbalance valve 1, so that frequent flow rate variations in the counterbalance valve 1 caused by pressure fluctuations are mitigated, thereby ensuring stable lowering of the actuator 2, and mitigating the problem of jitter.

[0036] As known to the inventor, a solution of using an independent control oil source to control an opening degree of a valve opening of the counterbalance valve 1 is provided in related technologies. In this method, oil needs to be separately guided from a control oil pump to a control port of the counterbalance valve 1. However, for the counterbalance valve 1 arranged at a high position, a control oil pipe needs to be excessively long, which can easily cause response lag, jitter, among other faults. In the variable-amplitude control system provided in the embodiments of this application, control oil of both control ports of the counterbalance valve 1 comes from the actuator 2, the running path of control oil is shorter, so that the problems of pressure inaccuracy and fluctuations caused in the control oil under the impact of the temperature and pipe length when a control oil pipe is excessively long in aerial operations can be solved.

[0037] In some embodiments provided in this application, the valve spool of the counterbalance valve 1 is connected to the valve spool of the first adjustable damper 3. With such an arrangement, the linkage form between the valve spool of the first adjustable damper 3 and the valve spool of the counterbalance valve 1 is simple, and the stability is better.

[0038] Optionally, the valve spool of the counterbalance valve 1 and the valve spool of the first adjustable damper 3 can be welded, threadedly connected or connected by a fastener. For example, a first end of the valve spool of the counterbalance valve 1 extends out of a valve body of the counterbalance valve 1, a first end of the valve spool of the first adjustable damper 3 extends out of a valve body of the first adjustable damper 3, and the first end of the valve spool of the counterbalance valve 1 is connected to the first end of the valve spool of the first adjustable damper 3. Alternatively, the valve spool of the counterbalance valve 1 and the valve spool of the first adjustable damper 3 are configured as an integrally formed structure, and the valve body of the counterbalance valve 1 and the valve body of the first adjustable damper 3 are configured as an integrally formed structure. The valve spool of the counterbalance valve 1 is in a sliding fit with the valve body of the counterbalance valve 1, and the valve spool of the first adjustable damper 3 is in a sliding fit with the valve body of the first adjustable damper 3.

[0039] Certainly, the linkage is not limited to the form of connecting the valve spool of the counterbalance valve 1 to the valve spool of the first adjustable damper 3. For example, in other embodiments provided in this application, the variable-amplitude control system further includes a position detection apparatus.

[0040] The position detection apparatus is configured to detect position information of the valve spool of the counterbalance valve 1. For example, a magnet is disposed on the valve spool of the counterbalance valve 1. The position detection apparatus may be configured as a magnetic sensor that can detect magnetic field variations. The magnetic sensor includes, but is not limited to, a Hall effect sensor. The first adjustable damper 3 is configured as an electro-proportional valve. Both the first adjustable damper 3 and the position detection apparatus are connected to a control component of the variable-amplitude control system. The control component may be, but is not limited to, a controller and a processor. The control component is configured to adjust the position of the valve spool of the first adjustable damper 3 based on the position information.

[0041] With such an arrangement, when pressure fluctuations of the actuator 2 cause variations in the return oil opening degree of the counterbalance valve 1, it is convenient to control the opening degree of the first adjustable damper 3 more accurately, so that the pressure fluctuation amplitude of the first control port 101 is closer to that of the second control port 102, thereby reducing variations of the return oil opening degree of the counterbalance valve 1, and ensuring the stability of the counterbalance valve 1.

[0042] Specifically, when the pressure of the oil of the hydraulic cylinder increases suddenly, the pressure of the second control port 102 increases, the difference between the pressure of the second control port 102 and the pressure of the first control port 101 increases, and the return oil opening degree of the counterbalance valve 1 increases. When determining, based on the position information, that the valve spool of the counterbalance valve 1 moves in a direction of increasing the return oil opening degree, the control component controls the opening degree of the first adjustable damper 3 to increase, making the pressure of the first control port 101 increase correspondingly, so that the pressure difference between the first control port 101 and the second control port 102 is reduced, thereby making the return oil opening degree of the counterbalance valve 1 return to the original state. Similarly, when the pressure of the oil of the hydraulic cylinder suddenly decreases, the control component controls the opening degree of the first adjustable damper 3 to decrease, and the pressure difference between the first control port 101 and the second control port 102 can also be reduced, so that the return oil opening degree of the counterbalance valve 1 returns to the original state, thereby ensuring the stability of the return oil opening degree of the counterbalance valve 1.

[0043] In some embodiments provided in this application, the variable-amplitude control system further includes an instruction acquisition assembly. The second adjustable damper 4 is configured as an electro-proportional valve. Both the instruction acquisition assembly and the second adjustable damper 4 are connected to the control component of the variable-amplitude control system. The instruction acquisition assembly is configured to acquire an operation instruction. For example, the instruction acquisition assembly may be configured as an operation joystick or an operation panel. The instruction acquisition assembly is configured to acquire an operation instruction inputted by an operator. The control component adjusts the opening degree of the second adjustable damper 4 based on the operation instruction.

[0044] With such an arrangement, the opening degree of the second adjustable damper 4 can be adjusted continuously, so that the opening degree can be accurately adjusted within a large range, thereby implementing the accurate adjustment and control of the lowering action of the actuator 2. In addition, the remote control and programmable control of the second adjustable damper 4 can be implemented, thereby providing convenience for automation, and enhancing the intelligence level of operations.

[0045] Optionally, the second adjustable damper 4 includes a third oil port 401, a fourth oil port 402, a second elastic member 403, and an electro-proportional assembly. The third oil port 401 is connected to the first adjustable damper 3, and the fourth oil port 402 is connected to the second oil port 104. The electro-proportional assembly is configured to drive the valve spool of the second adjustable damper 4 to move. The valve spool of the second adjustable damper 4 is at the first operating position to allow one-way flow from the fourth oil port 402 to the third oil port 401 and cut off flow from the third oil port 401 to the fourth oil port 402. The valve spool of the second adjustable damper 4 is at the second operating position to connect the third oil port 401 and the fourth oil port 402. The second elastic member 403 is connected to the valve spool of the second adjustable damper 4, and is configured to drive the second adjustable damper 4 to move toward the first operating position.

[0046] Certainly, the second adjustable damper 4 is not limited to being configured as an electro-proportional valve. For example, in other embodiments provided in this application, the second adjustable damper 4 is configured as a hydraulically-controlled valve with an opening degree that is adjustable by control oil. With such an arrangement, the second adjustable damper 4 requires low costs and has a simple and reliable structure and a fast response speed.

[0047] Certainly, the second adjustable damper 4 is also not limited to being configured as a hydraulically-controlled valve. For example, in other embodiments provided in this application, the second adjustable damper 4 is configured as a manually-adjustable valve with an opening degree that is adjustable manually. With such an arrangement, an operator may directly manually manipulate the second adjustable damper 4 to complete the control of the lowering action of the actuator 2, so that the variable-amplitude control system has a simple control structure and low costs.

[0048] In some embodiments provided in this application, the variable-amplitude control system further includes a first fixed damper 5. The first adjustable damper 3, the second adjustable damper 4, and the first fixed damper 5 are sequentially connected in series and are connected in parallel to the counterbalance valve 1. With such an arrangement, the first fixed damper 5 can stabilize the flow, and mitigate the impact caused by pressure fluctuations of oil on the return oil opening degree of the counterbalance valve 1.

[0049] In some embodiments provided in this application, the variable-amplitude control system further includes a second fixed damper 6. The second control port 102 is connected via the second fixed damper 6 to the oil port of the counterbalance valve 1 that is connected to the actuator 2. With such an arrangement, the second fixed damper 6 can stabilize the flow, and mitigate the impact caused by pressure fluctuations of oil on the return oil opening degree of the counterbalance valve 1.

[0050] In some embodiments provided in this application, the variable-amplitude control system further includes a third fixed damper 7. The oil passage between the first adjustable damper 3 and the second adjustable damper 4 is connected to the first control port 101 via the third fixed damper 7. With such an arrangement, the third fixed damper 7 can stabilize the flow, and mitigate the impact caused by pressure fluctuations of oil on the return oil opening degree of the counterbalance valve 1.

[0051] Embodiments of this application further provide an operation machine.

[0052] Specifically, the operation machine includes an actuator 2 and the variable-amplitude control system as described above. The counterbalance valve 1 is connected to the actuator 2.

[0053] The operation machine includes the variable-amplitude control system, and also has all the foregoing advantages of the variable-amplitude control system.

[0054] The actuator 2 may be a hydraulic cylinder or a hydraulic motor.

[0055] The operation machine includes, but is not limited to, a crane. For example, the crane may be an automobile crane.

[0056] In the description of the embodiments of this application, it needs to be noted that orientation or location relationships indicated by terms "center", "longitudinal", "transverse", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", and "outside" are based on orientation or location relationships shown in the accompanying drawings, and are only used to facilitate description of the embodiments of this application and simplify description, but are not used to indicate or imply that the apparatuses or elements must have specific orientations or are constructed and operated by using specific orientations, and therefore, cannot be understood as a limitation to the embodiments of this application. In addition, the terms "first", "second", and "third" are used only for description, but are not intended to indicate or imply relative importance.

[0057] In the description of the embodiments of this application, it needs to be noted that unless otherwise expressly specified and defined, terms "connected" and "connection" should be understood in a broad sense, for example, fixedly connected, detachably connected, or integrally connected; or mechanically connected, or electrically connected; or connected directly or through an intermediate. For persons of ordinary skill in the art, specific meanings of the foregoing terms in embodiments of this application may be understood based on a specific situation.

[0058] In the description of the specification, the description with reference to terms "an embodiment", "embodiments of the first aspect", "some embodiments", "an example", "a specific example" or "some embodiments", and the like indicates that specific features, structures, materials or characteristics described with reference to the embodiments or examples are included in at least one embodiment or example of this application.

[0059] In the specification, the schematic descriptions of the foregoing terms do not necessarily involve the same embodiments or examples. In addition, the described specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples. In addition, persons skilled in the art may integrate and combine different embodiments or examples or features in different embodiments or examples in the specification without causing any contradictions.

[0060] Finally, it should be noted that the foregoing embodiments are merely intended for describing the technical solutions of this application, but not for limiting this application. Although this application is described in detail with reference to the foregoing embodiments, persons of ordinary skill in the art should understand that they may still make modifications to the technical solutions described in the foregoing embodiments or make equivalent replacements to some technical features thereof, without departing from the spirit and scope of the technical solutions of embodiments of this application.

Claims

1. A variable-amplitude control system, comprising: a counterbalance valve (1) configured to be connected to an actuator (2) and capable of enabling the actuator (2) to return oil, wherein the counterbalance valve (1) comprises a first control port (101) and a second control port (102), a return oil opening degree of the counterbalance valve (1) is directly proportional to a difference between an oil pressure of the second control port (102) and an oil pressure of the first control port (101), and the second control port (102) is connected to an oil port of the counterbalance valve (1) that is connected to the actuator (2); and a first adjustable damper (3) and a second adjustable damper (4) connected in series and arranged in parallel to the counterbalance valve (1), wherein the first control port (101) is connected to an oil passage between the first adjustable damper (3) and the second adjustable damper (4), and a valve spool of the first adjustable damper (3) is linked to a valve spool of the counterbalance valve (1) to enable an opening degree of the first adjustable damper (3) to vary with the return oil opening degree of the counterbalance valve (1).

2. The variable-amplitude control system according to claim 1, wherein the valve spool of the counterbalance valve (1) is connected to the valve spool of the first adjustable damper (3).

3. The variable-amplitude control system according to claim 1, further comprising a position detection apparatus, wherein the position detection apparatus is configured to detect position information of the valve spool of the counterbalance valve (1), the first adjustable damper (3) is configured as an electro-proportional valve, both the first adjustable damper (3) and the position detection apparatus are connected to a control component of the variable-amplitude control system, and the control component is configured to adjust a position of the valve spool of the first adjustable damper (3) based on the position information.

4. The variable-amplitude control system according to claim 1, further comprising an instruction acquisition assembly, wherein the second adjustable damper (4) is configured as an electro-proportional valve, both the instruction acquisition assembly and the second adjustable damper (4) are connected to a control component of the variable-amplitude control system, the instruction acquisition assembly is configured to acquire an operation instruction, and the control component is configured to adjust an opening degree of the second adjustable damper (4) based on the operation instruction.

5. The variable-amplitude control system according to claim 1, wherein the second adjustable damper (4) is configured as a hydraulically-controlled valve with an opening degree that is adjustable by control oil.

6. The variable-amplitude control system according to claim 1, wherein the second adjustable damper (4) is configured as a manually-adjustable valve with an opening degree that is adjustable manually.

7. The variable-amplitude control system according to any one of claims 1 to 6, further comprising a first fixed damper (5), wherein the first adjustable damper (3), the second adjustable damper (4), and the first fixed damper (5) are sequentially connected in series and are connected in parallel to the counterbalance valve (1).

8. The variable-amplitude control system according to any one of claims 1 to 6, further comprising a second fixed damper (6), wherein the second control port (102) is connected via the second fixed damper (6) to the oil port of the counterbalance valve (1) that is connected to the actuator (2).

9. The variable-amplitude control system according to any one of claims 1 to 6, further comprising a third fixed damper (7), wherein the oil passage between the first adjustable damper (3) and the second adjustable damper (4) is connected to the first control port (101) via the third fixed damper (7).

10. An operation machine, comprising an actuator (2) and the variable-amplitude control system of any one of claims 1 to 9.

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