Lifting buffer control system of excavator working device

Abstract

The utility model discloses a lifting buffer control system of an excavator working device, a control handle is electrically connected with a whole vehicle main controller, and the whole vehicle main controller is electrically connected with a movable arm through a main pump and a main valve so as to adjust driving force and drive the movable arm to lift to a target position; the target position is provided with a lifting in-place proximity switch, and the lifting in-place proximity switch is electrically connected with the whole vehicle main controller so as to be switched on and transmit a signal to the whole vehicle main controller when the movable arm lifts to a position close to the target position; under the state that the lifting in-place proximity switch is switched off, the whole vehicle main controller adjusts the current of the main valve and the displacement of the main pump according to the wrenching angle of the control handle; and under the state that the lifting in-place proximity switch is switched on, the whole vehicle main controller controls the current of the main valve and the displacement of the main pump to be reduced. The problem that the whole excavator shakes due to lifting of a movable arm is solved, the stability and safety of the whole excavator are guaranteed, the labor intensity of operators can be reduced, and the working experience comfort and the working efficiency of the operators are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of construction machinery, in particular to a lifting buffer control system for a working device of an excavator. Background Art

[0002] As a kind of construction machinery widely used in roads, mining, and infrastructure construction, excavators have sufficient market demand, which not only promotes the development of excavator manufacturing enterprises but also prompts the market to continuously emerge with excavator products with excellent performance. The entire excavator industry presents a posture of a hundred schools of thought contending and a hundred flowers blooming.

[0003] Currently, the lifting or lowering action of the working device of an excavator, such as the boom, during the shoveling and discharging process is controlled by an operating handle. The main controller of the whole machine adjusts the working speed of the engine, the working current of the main pump solenoid valve, and the working current of the boom lifting / lowering solenoid valve according to the angle of the operating handle being pulled. The speed and amplitude of the boom during lifting or lowering directly depend on the angle and speed of the operating handle being pulled. For an excavator equipped with a standard boom, this control operation can meet the operation requirements of the excavator. However, for an excavator equipped with an extra-long boom, its defects are as follows: First, the extra-long boom will cause the whole excavator to shake due to large inertia during lifting or lowering, affecting the stability of the whole vehicle; Second, excavators with extra-long booms are generally used in the operation conditions of ships and docks. Once their stability is affected, they are prone to tilt and roll over, posing a safety hazard; Third, during the operation process, the operator needs to constantly pay attention to the operation of the boom and can adjust it at any time. The labor intensity of the operator is high, and the manpower consumption is large. It is difficult to concentrate the energy throughout the process, affecting the work efficiency and the comfort of the operator's work experience. Summary of the Utility Model

[0004] In order to overcome at least one of the above-mentioned defects of the prior art, the purpose of the utility model is to provide a lifting buffer control system for a working device of an excavator to improve the problem of the whole excavator shaking caused by the lifting and lowering of the boom, ensure the stability and safety of the whole vehicle, and be able to reduce the labor intensity of the operator, improve the comfort of the operator's work experience, and work efficiency.

[0005] The technical solution adopted by the utility model to solve its problems is as follows:

[0006] A lifting buffer control system for a working device of an excavator includes: a main controller of the whole vehicle, a boom, and an operating handle. The operating handle is electrically connected to the main controller of the whole vehicle, and the main controller of the whole vehicle is electrically connected to the boom through a main pump and a main valve to adjust the driving force and drive the boom to lift and lower to the target position;

[0007] A proximity switch for indicating the completion of lifting is provided at the target position. The proximity switch for indicating the completion of lifting is electrically connected to the main vehicle controller to be turned on when the boom approaches the target position and transmit a signal to the main vehicle controller.

[0008] In the state where the proximity switch for indicating the completion of lifting is turned off, the main vehicle controller adjusts the current of the main valve and the displacement of the main pump according to the angle of the operating handle being pulled.

[0009] In the state where the proximity switch for indicating the completion of lifting is turned on, the main vehicle controller controls the reduction of the current of the main valve and the displacement of the main pump.

[0010] As a preferred embodiment, in the present utility model, the proximity switch for indicating the completion of lifting includes a proximity switch for indicating the completion of lifting and a proximity switch for indicating the completion of lowering. The proximity switch for indicating the completion of lifting and the proximity switch for indicating the completion of lowering are installed in parallel at the target position and are both electrically connected to the main vehicle controller.

[0011] As a preferred embodiment, in the present utility model, the main vehicle controller is electrically connected to the main valve through a boom lifting solenoid valve and a boom lowering solenoid valve. The boom lifting solenoid valve and the boom lowering solenoid valve are arranged in parallel.

[0012] As a preferred embodiment, in the present utility model, the main vehicle controller is electrically connected to the main pump through a main pump solenoid valve.

[0013] As a preferred embodiment, in the present utility model, the main pump is driven by an engine, and the output end of the engine is connected to the input end of the main pump.

[0014] As a preferred embodiment, in the present utility model, the engine and the main pump are connected through a coupling.

[0015] As a preferred embodiment, in the present utility model, the engine controls its operating state through an engine controller, and the engine controller is electrically connected to the main vehicle controller.

[0016] As a preferred embodiment, in the present utility model, the main vehicle controller is electrically connected to a vehicle display, and the vehicle display is used to set the working program of the boom.

[0017] As a preferred embodiment, in the present utility model, the main pump is provided with a pressure sensor, and the pressure sensor is electrically connected to the main vehicle controller.

[0018] As a preferred embodiment, in the present utility model, the boom adjusts its lifting speed through a boom cylinder, and the moving speed of the piston rod of the boom cylinder is controlled by the main valve and the main pump.

[0019] The beneficial effects of the lifting buffer control system for the working device of the excavator provided by the present utility model are as follows:

[0020] By setting up the proximity switch for reaching the lifting position, the lifting action of the boom can be divided into two processes. In the early stage of lifting, the main vehicle controller adjusts the current of the main valve and the displacement of the main pump according to the angle of the operating handle being pulled, so as to achieve the rapid lifting of the boom. When the boom is lifted close to the target position, the proximity switch for reaching the lifting position is turned on and transmits a signal to the main vehicle controller. The main vehicle controller controls the reduction of the current of the main valve and the displacement of the main pump, so that the boom slowly lifts to the target position.

[0021] In this way, when the boom lifts to the target position, the impact on the whole excavator is small, avoiding the shaking of the whole excavator, ensuring the stability of the whole vehicle, thus avoiding the occurrence of situations such as the excavator tilting and rolling over, and improving the safety of the excavator operation. At the same time, the labor intensity of the operator is greatly reduced, and the work efficiency and the comfort of the operator's work experience are improved. Description of the Drawings

[0022] Figure 1 It is a schematic diagram of the lifting buffer control system of the working device of the excavator of the present utility model;

[0023] Figure 2 It is a flow chart of the boom lifting mode of the present utility model;

[0024] Figure 3 It is a flow chart of the boom lowering mode of the present utility model.

[0025] Among them, the meanings of the reference numerals are as follows:

[0026] 1. Main vehicle controller; 2. Boom; 3. Operating handle; 4. Main pump; 5. Main valve; 6. Engine; 7. Coupling; 8. Engine controller; 9. Whole vehicle display; 10. Boom cylinder;

[0027] S1. Proximity switch for reaching the lifting position; S2. Proximity switch for reaching the lowering position; A1. Main pump solenoid valve; A2. Boom lifting solenoid valve; A3. Boom lowering solenoid valve; P1. Pressure sensor. Detailed Embodiment

[0028] For better understanding and implementation, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model.

[0029] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs. The terms used in the description of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model.

[0031] Referring to Figure 1 and in combination with Figure 2 and Figure 3 The present utility model provides a lifting buffer control system for an excavator working device, including: a host vehicle controller 1, a boom 2, and a control handle 3. The control handle 3 is electrically connected to the host vehicle controller 1, and the host vehicle controller 1 is electrically connected to the boom 2 through a main pump 4 and a main valve 5 to adjust the driving force and drive the boom 2 to lift to a target position. A lift-in-place proximity switch is provided at the target position, and the lift-in-place proximity switch is electrically connected to the host vehicle controller 1 to be turned on when the boom 2 lifts to a position close to the target position and transmit a signal to the host vehicle controller 1. In a state where the lift-in-place proximity switch is turned off, the host vehicle controller 1 adjusts the current of the main valve 5 and the displacement of the main pump 4 according to the angle of the control handle 3 being pulled. In a state where the lift-in-place proximity switch is turned on, the host vehicle controller 1 controls the current of the main valve 5 and the displacement of the main pump 4 to decrease.

[0032] The main vehicle controller 1 is the overall control unit of the excavator, used to control the independent actions of various components of the excavator and the coordinated actions between components. The control lever 3 can be adjusted at different angles by pulling to transmit signals to the main vehicle controller 1, so that the main vehicle controller 1 controls the displacement of the main pump 4 and the current of the main valve 5, and further controls the speed of the boom 2 in the early stage of lifting or lowering. There is a target position for both lifting and lowering of the boom 2. The lift / lower in-place proximity switch is used to disconnect in the early stage of lifting or lowering of the boom 2, so that the speed of lifting or lowering of the boom 2 completely depends on the pulling angle of the control lever 3. Moreover, the lift / lower in-place proximity switch is used to connect and transmit signals to the main vehicle controller 1 when the boom 2 is lifted or lowered to near the target position. At this time, the speed of lifting or lowering of the boom 2 is jointly determined by the signal of the pulling angle of the control lever 3 and the signal of the connection of the lift / lower in-place proximity switch. After receiving the signal of the pulling angle of the control lever 3 and the signal of the connection of the lift / lower in-place proximity switch, the main vehicle controller 1 controls the displacement of the main pump 4 and the current of the main valve 5 to be significantly reduced, thereby controlling the boom 2 to slowly lift or lower.

[0033] That is, the present utility model can divide the lifting and lowering actions of the boom 2 into two processes by setting the lift / lower in-place proximity switch. In the early stage of lifting and lowering, the main vehicle controller 1 adjusts the current of the main valve 5 and the displacement of the main pump 4 according to the pulling angle of the control lever 3, so as to realize the rapid lifting and lowering of the boom 2; when the boom 2 is lifted or lowered to near the target position, the lift / lower in-place proximity switch connects and transmits signals to the main vehicle controller 1, and the main vehicle controller 1 controls the current of the main valve 5 and the displacement of the main pump 4 to be reduced, so that the boom 2 slowly lifts and lowers to the target position.

[0034] In this way, when the boom 2 is lifted and lowered to the target position, the impact on the entire excavator vehicle is small, avoiding causing the entire excavator vehicle to shake, ensuring the stability of the entire vehicle, thus avoiding situations such as the excavator tilting and tipping over, and improving the safety of excavator operation. At the same time, the labor intensity of the operator is greatly reduced, and the work efficiency and the comfort of the operator's work experience are improved.

[0035] Among them, the lift / lower in-place proximity switch includes a lift-in-place proximity switch S1 and a lower-in-place proximity switch S2. The lift-in-place proximity switch S1 and the lower-in-place proximity switch S2 are installed in parallel at the target position and are both electrically connected to the main vehicle controller 1.

[0036] The lift-in-place proximity switch S1 and the lower-in-place proximity switch S2 are both common proximity switches on the market. The lift-in-place proximity switch S1 is installed at the highest target position where the boom 2 needs to be lifted. In the early stage of the boom 2 being lifted, the lift-in-place proximity switch S1 is in the off state, and the lifting speed of the boom 2 completely depends on the deflection angle of the control handle 3. That is, the main vehicle controller 1 adjusts the current of the main valve 5 and the displacement of the main pump 4 according to the deflection angle of the control handle 3, so as to achieve the rapid lifting of the boom 2. When the boom 2 is lifted close to the highest target position, the lift-in-place proximity switch S1 is turned on and transmits a signal to the main vehicle controller 1. At this time, the lifting speed of the boom 2 is jointly determined by the signal of the deflection angle of the control handle 3 and the signal of the lift-in-place proximity switch S1 being turned on. After receiving the signal of the deflection angle of the control handle 3 and the signal of the lift-in-place proximity switch S1 being turned on, the main vehicle controller 1 significantly reduces the displacement of the main pump 4 and the current of the main valve 5, so as to control the boom 2 to slowly lift to the highest target position. In this way, when the boom 2 is lifted to the highest target position, the impact on the entire excavator is small, avoiding causing the entire excavator to shake, ensuring the stability of the entire vehicle, thus avoiding situations such as the excavator tilting and tipping over, and improving the safety of excavator operation. At the same time, it greatly reduces the labor intensity of the operator and improves the work efficiency and the comfort of the operator's work experience.

[0037] The lower-in-place proximity switch S2 is installed at the lowest target position where the boom 2 needs to be lowered. In the early stage of the boom 2 being lowered, the lower-in-place proximity switch S2 is in the off state, and the lowering speed of the boom 2 completely depends on the deflection angle of the control handle 3. That is, the main vehicle controller 1 adjusts the current of the main valve 5 and the displacement of the main pump 4 according to the deflection angle of the control handle 3, so as to achieve the rapid lowering of the boom 2. When the boom 2 is lowered close to the lowest target position, the lower-in-place proximity switch S2 is turned on and transmits a signal to the main vehicle controller 1. At this time, the lowering speed of the boom 2 is jointly determined by the signal of the deflection angle of the control handle 3 and the signal of the lower-in-place proximity switch S2 being turned on. After receiving the signal of the deflection angle of the control handle 3 and the signal of the lower-in-place proximity switch S2 being turned on, the main vehicle controller 1 significantly reduces the displacement of the main pump 4 and the current of the main valve 5, so as to control the boom 2 to slowly lower to the lowest target position. In this way, when the boom 2 is lowered to the target position, the impact on the entire excavator is small, avoiding causing the entire excavator to shake, ensuring the stability of the entire vehicle, thus avoiding situations such as the excavator tilting and tipping over, and improving the safety of excavator operation. At the same time, it greatly reduces the labor intensity of the operator and improves the work efficiency and the comfort of the operator's work experience.

[0038] On this basis, the vehicle main controller 1 is electrically connected to the main valve 5 through the boom lift solenoid valve A2 and the boom lower solenoid valve A3. The boom lift solenoid valve A2 and the boom lower solenoid valve A3 are arranged in parallel. The boom lift solenoid valve A2 corresponds to the lift mode of the boom 2, and the boom lower solenoid valve A3 corresponds to the lower mode of the boom 2. The vehicle main controller 1 adjusts the current of the boom lift solenoid valve A2 to adjust the current of the main valve 5 when the boom 2 is lifted, and the vehicle main controller 1 adjusts the current of the boom lower solenoid valve A3 to adjust the current of the main valve 5 when the boom 2 is lowered.

[0039] The vehicle main controller 1 is electrically connected to the main pump 4 through the main pump solenoid valve A1. During the lifting or lowering of the boom 2, the vehicle main controller 1 adjusts the current of the main pump solenoid valve A1 to adjust the displacement of the main pump 4.

[0040] In the early stage of the boom 2 lifting, the lift-in-place proximity switch S1 is in the off state. The current of the boom lift solenoid valve A2 and the current of the main pump solenoid valve A1 completely depend on the pulling angle of the control handle 3. That is, the vehicle main controller 1 adjusts the currents of the boom lift solenoid valve A2 and the main pump solenoid valve A1 according to the pulling angle of the control handle 3, so as to adjust the current of the main valve 5 and the displacement of the main pump 4 to achieve the rapid lifting of the boom 2. When the boom 2 is lifted to near the highest target position, the lift-in-place proximity switch S1 is turned on and transmits a signal to the vehicle main controller 1. At this time, the currents of the boom lift solenoid valve A2 and the main pump solenoid valve A1 are jointly determined by the signal of the pulling angle of the control handle 3 and the signal of the lift-in-place proximity switch S1 being turned on. After receiving the signal of the pulling angle of the control handle 3 and the signal of the lift-in-place proximity switch S1 being turned on, the vehicle main controller 1 controls the currents of the boom lift solenoid valve A2 and the main pump solenoid valve A1 to be greatly reduced, thereby controlling the displacement of the main pump 4 and the current of the main valve 5 to be greatly reduced, and then controlling the boom 2 to be slowly lifted to the highest target position.

[0041] In the early stage of the boom 2 descending, the descending-in-place proximity switch S2 is in the off state. The current of the boom descending solenoid valve A3 and the current of the main pump solenoid valve A1 completely depend on the deflection angle of the control handle 3. That is, the main vehicle controller 1 adjusts the currents of the boom descending solenoid valve A3 and the main pump solenoid valve A1 according to the deflection angle of the control handle 3, thereby adjusting the current of the main valve 5 and the displacement of the main pump 4 to achieve the rapid descent of the boom 2. When the boom 2 descends to near the lowest target position, the descending-in-place proximity switch S2 is turned on and transmits a signal to the main vehicle controller 1. At this time, the currents of the boom descending solenoid valve A3 and the main pump solenoid valve A1 are jointly determined by the signal of the deflection angle of the control handle 3 and the signal of the descending-in-place proximity switch S2 being turned on. After receiving the signal of the deflection angle of the control handle 3 and the signal of the descending-in-place proximity switch S2 being turned on, the main vehicle controller 1 controls the currents of the boom descending solenoid valve A3 and the main pump solenoid valve A1 to be greatly reduced, thereby controlling the displacement of the main pump 4 and the current of the main valve 5 to be greatly reduced, and then controlling the boom 2 to slowly descend to the lowest target position.

[0042] In the present utility model, the main pump 4 is driven by the engine 6, and the output end of the engine 6 is connected to the input end of the main pump 4. When the engine 6 operates, its output shaft rotates to drive the main pump 4 to discharge oil to drive the boom 2 to lift or descend. In different stages of the boom 2 lifting or descending, the operating speed of the engine 6 is different to cooperate with the different displacements of the main pump 4 to achieve the rapid or slow lifting or descending of the boom 2.

[0043] The engine 6 controls its operating state through the engine controller 8, and the engine controller 8 is electrically connected to the main vehicle controller 1. That is, the main vehicle controller 1 controls the operating speed of the engine 6 through the engine controller 8 to cooperate with the displacement of the main pump 4, thereby adapting to the speed of the boom 2 lifting or descending.

[0044] Specifically, in the early stage of the boom 2 lifting, the lifting-in-place proximity switch S1 is in the off state. The current of the boom lifting solenoid valve A2, the current of the main pump solenoid valve A1, and the operating speed of the engine 6 completely depend on the pulling angle of the control handle 3. That is, the main vehicle controller 1 adjusts the currents of the boom lifting solenoid valve A2 and the main pump solenoid valve A1 according to the pulling angle of the control handle 3, and adjusts the operating speed of the engine 6 through the engine controller 8, so as to adjust the current of the main valve 5 and the displacement of the main pump 4 to achieve the rapid lifting of the boom 2. When the boom 2 is lifted to near the highest target position, the lifting-in-place proximity switch S1 is turned on and transmits a signal to the main vehicle controller 1. At this time, the currents of the boom lifting solenoid valve A2 and the main pump solenoid valve A1 and the operating speed of the engine 6 are jointly determined by the signal of the pulling angle of the control handle 3 and the signal of the lifting-in-place proximity switch S1 being turned on. After receiving the signal of the pulling angle of the control handle 3 and the signal of the lifting-in-place proximity switch S1 being turned on, the main vehicle controller 1 controls the currents of the boom lifting solenoid valve A2 and the main pump solenoid valve A1 to be significantly reduced, and controls the operating speed of the engine 6 to be significantly reduced through the engine controller 8, so as to control the displacement of the main pump 4 and the current of the main valve 5 to be significantly reduced, and then control the boom 2 to slowly lift to the highest target position.

[0045] In the early stage of the boom 2 descending, the descending-in-place proximity switch S2 is in the off state. The current of the boom descending solenoid valve A3, the current of the main pump solenoid valve A1, and the operating speed of the engine 6 completely depend on the pulling angle of the control handle 3. That is, the main vehicle controller 1 adjusts the currents of the boom descending solenoid valve A3 and the main pump solenoid valve A1 and the operating speed of the engine 6 according to the pulling angle of the control handle 3, so as to adjust the current of the main valve 5 and the displacement of the main pump 4 to achieve the rapid descent of the boom 2. When the boom 2 descends to near the lowest target position, the descending-in-place proximity switch S2 is turned on and transmits a signal to the main vehicle controller 1. At this time, the currents of the boom descending solenoid valve A3 and the main pump solenoid valve A1 and the operating speed of the engine 6 are jointly determined by the signal of the pulling angle of the control handle 3 and the signal of the descending-in-place proximity switch S2 being turned on. After receiving the signal of the pulling angle of the control handle 3 and the signal of the descending-in-place proximity switch S2 being turned on, the main vehicle controller 1 controls the currents of the boom descending solenoid valve A3 and the main pump solenoid valve A1 to be significantly reduced, and controls the operating speed of the engine 6 to be significantly reduced through the engine controller 8, so as to control the displacement of the main pump 4 and the current of the main valve 5 to be significantly reduced, and then control the boom 2 to slowly descend to the lowest target position.

[0046] It should be noted that the main pump 4 can be directly connected to the engine 6. At this time, the input shaft of the main pump 4 needs to match the output shaft model of the engine 6. In order to improve the applicability and wide application of the main pump 4 and the engine 6, the engine 6 and the main pump 4 are connected through a coupling 7. In this way, various selections can be realized according to the actual working conditions to avoid the shortage of parts.

[0047] On the basis of the above structure, the boom 2 adjusts the lifting speed through the boom cylinder 10, and the moving speed of the piston rod of the boom cylinder 10 is controlled by the main valve 5 and the main pump 4. That is, by controlling the current of the main valve 5 and the main pump 4, the moving speed of the piston rod of the boom cylinder 10 can be controlled, so as to control the lifting or lowering speed of the boom 2, so as to realize the rapid lifting or lowering of the boom 2 in the early stage, and the boom 2 slowly lifts or lowers when approaching the highest or lowest target position. In this way, when the boom 2 is lifted or lowered to the target position, the impact on the whole excavator is small, avoiding the shaking of the whole excavator, ensuring the stability of the whole vehicle, thus avoiding the occurrence of situations such as the excavator tilting and tipping over, and improving the safety of the excavator operation.

[0048] Moreover, the main pump 4 is provided with a pressure sensor P1, and the pressure sensor P1 is electrically connected to the main vehicle controller 1 of the whole vehicle. During the whole process of the boom 2 lifting or lowering, the pressure sensor P1 can transmit the pressure signal of the main pump 4 to the main vehicle controller 1 of the whole vehicle in real time, so as to facilitate the main vehicle controller 1 to adjust the pressure of the main pump 4 in real time according to the working state of the boom 2.

[0049] In addition, the main vehicle controller 1 of the whole vehicle is electrically connected with a whole vehicle display 9, and the whole vehicle display 9 is used to set the working program of the boom 2. Parameters such as the speed of the boom 2 in the early and later stages of lifting or lowering, the highest target position and the lowest target position, the displacement of the main pump 4 in different stages, the current of the main valve 5, the main pump solenoid valve A1, the boom lifting solenoid valve A2, the boom lowering solenoid valve A3 in different stages, and the working speed of the engine 6 in different stages are all set and presented through the whole vehicle display 9 for the operator to understand the working state of the excavator in real time.

[0050] The technical means disclosed in the solution of the present utility model are not limited to the technical means disclosed in the above embodiments, but also include the technical solutions composed of any combination of the above technical features. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and retouches can be made, and these improvements and retouches are also regarded as the protection scope of the present utility model.

Claims

1. A lifting buffer control system for an excavator working device, characterized in that, Comprising: A whole vehicle main controller, a boom, and a control handle. The control handle is electrically connected to the whole vehicle main controller, and the whole vehicle main controller is electrically connected to the boom through a main pump and a main valve to adjust the driving force and drive the boom to lift to a target position; A lift-in-place proximity switch is provided at the target position. The lift-in-place proximity switch is electrically connected to the whole vehicle main controller to be turned on and transmit a signal to the whole vehicle main controller when the boom lifts to a position close to the target position; In a state where the lift-in-place proximity switch is off, the whole vehicle main controller adjusts the current of the main valve and the displacement of the main pump according to the angle at which the control handle is actuated; In a state where the lift-in-place proximity switch is on, the whole vehicle main controller controls the current of the main valve and the displacement of the main pump to decrease.

2. The lifting buffer control system of the excavator working device according to claim 1, characterized in that: The lift-in-place proximity switch includes a lift-up-in-place proximity switch and a lift-down-in-place proximity switch. The lift-up-in-place proximity switch and the lift-down-in-place proximity switch are installed in parallel at the target position and are both electrically connected to the whole vehicle main controller.

3. The lifting buffer control system of the excavator working device according to claim 2, wherein: The whole vehicle main controller is electrically connected to the main valve through a boom lift solenoid valve and a boom lower solenoid valve. The boom lift solenoid valve and the boom lower solenoid valve are arranged in parallel.

4. The lifting and buffering control system of the excavator working device according to claim 1, wherein: The whole vehicle main controller is electrically connected to the main pump through a main pump solenoid valve.

5. The lifting buffer control system of the excavator working device according to claim 1, wherein: The main pump is driven by an engine, and the output end of the engine is connected to the input end of the main pump.

6. The lifting and buffering control system of the working device of the excavator according to claim 5, characterized in that: The engine and the main pump are connected by a coupling.

7. The lifting buffer control system of the excavator working device according to claim 5, characterized in that: The engine controls its working state through an engine controller, and the engine controller is electrically connected to the whole vehicle main controller.

8. The lifting buffer control system of the excavator working device according to any one of claims 1-7, characterized in that: The whole vehicle main controller is electrically connected to a whole vehicle display, and the whole vehicle display is used to set the working program of the boom.

9. The lifting buffer control system for the working device of an excavator according to any one of claims 1-7, characterized in that: The main pump is provided with a pressure sensor, and the pressure sensor is electrically connected to the whole vehicle main controller.

10. The lifting buffer control system of the excavator working device according to any one of claims 1-7, characterized in that: The boom adjusts its lifting speed through a boom cylinder, and the moving speed of the piston rod of the boom cylinder is controlled by the main valve and the main pump.

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