Vertical fixing device of spring for shock absorber and control method of vertical fixing device

Abstract

The invention discloses a spring technology, and aims to provide a setting device for a spring for a shock absorber and a control method of the setting device, and the setting device is characterized by comprising a fixed frame, a fixed frame, a fixed frame and a movable frame, the spring fixing mechanism is installed at the bottom of the fixing frame and used for fixing springs of different specifications; the hydraulic pressure applying system is mounted at the top of the fixed frame and is used for applying controllable compression force to the spring; the pressure sensing module is arranged between the spring fixing mechanism and the hydraulic pressure applying system and used for monitoring the pressure borne by the spring in real time; the main control unit is used for receiving data of the pressure sensing module, dynamically adjusting the hydraulic pressure applying system according to the data of the pressure sensing module, and triggering standing operation when a preset condition is met; compared with the prior art, a complete spring setting control closed-loop system is constructed by integrating the fixing frame, the spring fixing mechanism, the hydraulic pressure applying system, the pressure sensing module and the main control unit; the invention is applicable to the technical field of springs.

Description

Technical Field

[0001] The present invention relates to a spring technology, and more specifically, it relates to a spring standing device for a shock absorber and its control method. Background Art

[0002] Shock absorbers are widely used in modern mechanical equipment, especially in the fields of automobiles, construction machinery, aerospace, etc., to relieve the impact and vibration on the equipment. The performance and reliability of shock absorbers are directly related to the safety and service life of the equipment. One of its core components is a spring, which has high performance requirements and can withstand a certain compressive force and maintain stable elastic characteristics under specific load conditions. During the production and application of springs, it is necessary to "stand" the springs through certain equipment, that is, to apply an appropriate compressive force to stabilize their deformation to ensure their long-term reliability in actual use.

[0003] In the prior art, the standing of springs usually relies on manual operation or simple mechanical devices, which are difficult to meet the requirements of precise adjustment and high efficiency. In addition, traditional standing devices have deficiencies in aspects such as pressure control and deformation stability detection, resulting in difficulty in strictly controlling the quality of springs and affecting the overall performance of shock absorbers. Therefore, it has become an urgent need to develop a spring standing device for shock absorbers with high-precision and high-efficiency control. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a spring standing device for a shock absorber and its control method.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: A spring standing device for a shock absorber, comprising:

[0006] A fixed frame: arranged on a horizontal plane for carrying other components;

[0007] A spring fixing mechanism: installed at the bottom of the fixed frame for fixing springs of different specifications;

[0008] A hydraulic pressure application system: installed at the top of the fixed frame for applying a controllable compressive force to the spring;

[0009] A pressure sensing module: arranged between the spring fixing mechanism and the hydraulic pressure application system for real-time monitoring of the pressure on the spring;

[0010] A main control unit: for receiving the data of the pressure sensing module, dynamically adjusting the hydraulic pressure application system according to the data of the pressure sensing module, and triggering the standing operation when preset conditions are met.

[0011] The present invention is further configured such that: the spring fixing mechanism includes a fixing plate installed on the frame and used for providing support, and a fixing groove adapted to the outer diameter of the spring and capable of accommodating the spring is formed on the fixing plate;

[0012] The hydraulic pressure application system includes a hydraulic cylinder installed on the frame, a piston arranged in the hydraulic cylinder, a pressing plate installed at the bottom end of the piston and having a fixing groove adapted to the outer diameter of the spring and capable of accommodating the spring on the bottom surface thereof, and a pressure valve group.

[0013] The present invention is further configured such that: the pressure adjustment range of the hydraulic pressure application system is 0 - 50 MPa, and the adjustment accuracy range is ±0.5 MPa; the ratio of the piston stroke of the hydraulic cylinder to the maximum compression amount of the spring is 1:1.1 - 1:1.3.

[0014] The present invention is further configured to further include:

[0015] A displacement sensing module: installed on the fixed frame and connected to the main control unit, and used for real-time monitoring of the spring compression amount;

[0016] A temperature compensation module: dynamically trimming the pressure output of the hydraulic pressure application system according to the ambient temperature;

[0017] A protection mechanism: slidably arranged on the fixed frame, including sliding grooves formed on both sides of the fixed frame, a protection net slidably connected in the sliding grooves and capable of linearly moving along the sliding grooves, and a locking component for locking the protection net; used for preventing the spring from popping out during spring standing, and avoiding harm to operators and surrounding equipment.

[0018] A control method for a spring standing device of a shock absorber, characterized by comprising the following steps:

[0019] S1. System initialization:

[0020] Start the self-check program, check the states of each mechanism, and calibrate the pressure sensing module and the displacement sensing module;

[0021] S2. Parameter input:

[0022] Input into the main control unit: set the target pressure value Xt, the target pressure holding time Tt, the allowable pressure deviation △X, and the compression amount threshold Ymax;

[0023] S3. Fix the spring:

[0024] First, move the protection net upward, and fix the protection net through the locking component to expose the spring fixing mechanism for facilitating the installation of the spring. Then, place the spring to be stood on the fixing groove on the fixing plate, and then unlock the locking component and let the protection net fall to cover the outside of the spring fixing mechanism;

[0025] S4, pre-pressurization stage:

[0026] The main control unit pre-compresses the spring with a pressure of 10% Xt in the hydraulic cylinder, so that the fixed groove on the pressure plate at the bottom of the piston contacts the top of the spring to eliminate the assembly gap. At this time, the initial compression amount Y0 is recorded and the reference temperature K0 is set;

[0027] S5, multi-stage pressurization:

[0028] Process 1: The main control unit controls the hydraulic pressure system to quickly pressurize to 50% Xt in the coarse adjustment mode. If the pressure fluctuation exceeds 20% △X, the pressure is suspended and the oil flow is corrected;

[0029] Process 2: Switch to fine adjustment mode, pressurize from 5%Xt to 80%Xt, and the residence time of each level is T=2(Y1-Y0) / V, where Y1 is the current compression amount and V is the compression rate;

[0030] Process 3: Pressurize to Xt, calculate the slope of the pressure-compression curve in real time, and trigger an abnormal alarm if the slope deviates from the theoretical value by ±15%;

[0031] S6. Pressure holding judgment:

[0032] If X1 satisfies |X1-Xt|≤△X, the pressure holding timer is started, where X1 is the current pressure;

[0033] If the pressure fluctuation exceeds 50% △X three times in a row during the pressure holding period, reset the timing and fine-tune the hydraulic valve;

[0034] S7, deformation stability test:

[0035] When the holding time reaches 80% Tt, calculate the compression change rate dY / dt. If dY / dt < 0.005 mm / s and lasts for 10 seconds, the deformation is determined to be stable; otherwise, extend the holding time to 120% Tt;

[0036] S8, Temperature compensation:

[0037] Monitor the ambient temperature K1 in real time. If |K1-K0|≥5°C, correct the target pressure according to Xs=Xt[1-0.005(K1-K0)];

[0038] S9, pressure relief release:

[0039] Adopt stepped pressure relief, each level of pressure relief is 5%Xt, and each level is separated by 3s to prevent spring rebound;

[0040] S10. Remove the spring:

[0041] After all pressure relief is completed, the main control unit controls the suspension of the device operation. The operator moves the protective net upward and fixes the protective net through the locking component to expose the spring fixing mechanism, and then the completed spring can be taken out.

[0042] The present invention is further configured as: in the step S6, the pressure fluctuation fine-tuning adopts the PID algorithm, with the proportional coefficient = 0.8, the integral time = 2s, and the differential time = 0.5s.

[0043] The present invention is further configured as: further including an emergency pressure relief mode: when the pressure > 120% Xt or the compression amount > 110% Ymax, the hydraulic pressure application system relieves the pressure to a safe value within 0.5s - 1s.

[0044] The beneficial effects of the present invention are:

[0045] 1. Compared with the prior art, the spring standing device for shock absorbers of the present invention constructs a complete spring standing control closed-loop system by integrating a fixed frame, a spring fixing mechanism, a hydraulic pressure application system, a pressure sensing module and a main control unit; the fixed frame provides rigid support to avoid structural deformation of the equipment caused by uneven force and ensure the standing accuracy; the vertical alignment design of the spring fixing mechanism and the hydraulic pressure application system can eliminate the lateral offset of the spring, reducing the risk of stress concentration and plastic deformation caused by eccentric compression; the main control unit dynamically adjusts the hydraulic pressure based on the pressure sensing data to achieve precise force-displacement matching. Compared with the traditional manual control method, the standing qualification rate can be increased by 25% - 30%. In addition, the real-time pressure monitoring and feedback mechanism effectively prevents permanent damage of the spring caused by overpressure.

[0046] 2. The fixed groove design of the spring fixing mechanism of the spring standing device for shock absorbers of the present invention realizes precise positioning of multi-specification springs through geometric adaptation, ensuring that the spring axis coincides strictly with the force application direction of the pressure plate, reducing the lateral shear force caused by misalignment, and reducing the risk of non-elastic deformation of the spring by about 40%; the matching fixed groove at the bottom of the pressure plate is linked with the piston stroke to complete the spring end face fitting in the preloading stage, eliminating the impact load caused by the assembly gap and making the pressurization process smoother; the segmented control characteristics of the multi-stage pressure valve group combined with the stroke ratio design of the hydraulic cylinder not only meet the maximum compression amount requirement of the spring, but also avoid energy waste caused by excessive stroke, saving 15% of the hydraulic energy consumption compared with the conventional design.

[0047] 3. In the present invention, the pressure adjustment range of 0 - 50 MPa covers the full range of requirements from light suspension springs to heavy industrial shock-absorbing springs. The precision control of ±0.5 MPa is achieved through a high-response servo valve, ensuring precise dwell near the spring yield point. The ratio of the piston stroke to the maximum spring compression is limited based on experimental verification: when the ratio is less than 1.1, incomplete compression is likely to occur due to insufficient margin; while when the ratio is greater than 1.3, the energy consumption of the ineffective stroke increases. Therefore, this ratio design enables the effective compression section of the spring to account for more than 90%, and at the same time controls the lateral deformation within 0.5% of the spring diameter.

[0048] 4. The structure of the present invention is reasonable, easy to manufacture, simple to operate, avoids the defects in the prior art, and is suitable for popularization and implementation. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a structural diagram of the spring standing device for the shock absorber of the present invention.

[0050] Figure 2 It is a partial structural diagram of the spring standing device for the shock absorber of the present invention.

[0051] Figure 3 It is a flowchart of the control method of the spring standing device for the shock absorber of the present invention.

[0052] Figures 1-3 Reference numerals: 1, fixed frame; 2, spring fixing mechanism; 3, hydraulic pressure application system; 4, main control unit; 5, fixing plate; 6, fixing groove; 7, hydraulic cylinder; 8, piston; 9, pressing plate; 10, protection mechanism. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0053] Refer to Figures 1-3 To further illustrate the embodiments of the spring standing device for the shock absorber of the present invention and its control method.

[0054] For ease of explanation, spatial relative terms such as "upper", "lower", "left", "right", etc. are used in the embodiments to describe the relationship between one element or feature shown in the figure and another element or feature. It should be understood that in addition to the orientation shown in the figure, the spatial terms are intended to include different orientations during the use or operation of the device. For example, if the device in the figure is inverted, the element described as being "below" other elements or features will be positioned "above" other elements or features. Therefore, the exemplary term "lower" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here can be interpreted accordingly.

[0055] Moreover, relational terms such as "first" and "second" are only used to distinguish one component with the same name from another, and do not necessarily require or imply any such actual relationship or order between these components.

[0056] Figures 1 to 3 A spring standing device for a shock absorber shown includes:

[0057] Fixed frame 1: Set on a horizontal plane for carrying other components;

[0058] Spring fixing mechanism 2: Installed at the bottom of the fixed frame 1 for fixing springs of different specifications;

[0059] Hydraulic pressure application system 3: Installed on the top of the fixed frame 1 for applying a controllable compressive force to the spring;

[0060] Pressure sensing module: Set between the spring fixing mechanism 2 and the hydraulic pressure application system 3 for real-time monitoring of the pressure on the spring;

[0061] Main control unit 4: For receiving data from the pressure sensing module, dynamically adjusting the hydraulic pressure application system 3 according to the data of the pressure sensing module, and triggering the standing operation when preset conditions are met;

[0062] By integrating the fixed frame 1, the spring fixing mechanism 2, the hydraulic pressure application system 3, the pressure sensing module and the main control unit 4, a complete spring standing control closed-loop system is constructed; the fixed frame 1 provides rigid support, avoiding structural deformation of the equipment due to uneven force and ensuring the standing accuracy; the vertical alignment design of the spring fixing mechanism 2 and the hydraulic pressure application system 3 can eliminate the lateral offset of the spring, reducing the risk of stress concentration and plastic deformation caused by eccentric compression; the main control unit 4 dynamically adjusts the hydraulic pressure based on the pressure sensing data to achieve precise force-displacement matching. Compared with the traditional manual control method, the standing qualification rate can be increased by 25%-30%. In addition, the real-time pressure monitoring and feedback mechanism effectively prevents permanent damage to the spring caused by overpressure.

[0063] The spring fixing mechanism 2 includes a fixing plate 5 installed on the frame and used for providing support. The fixing plate 5 is provided with a fixing groove 6 adapted to the outer diameter of the spring and capable of accommodating the spring;

[0064] The hydraulic pressure application system 3 includes a hydraulic cylinder 7 installed on the frame, a piston 8 arranged in the hydraulic cylinder 7, a pressing plate 9 installed at the bottom end of the piston 8 and having a fixing groove 6 adapted to the outer diameter of the spring and capable of accommodating the spring on the bottom surface, and a pressure valve group;

[0065] The fixing groove 6 design of the spring fixing mechanism 2 realizes the precise positioning of springs of various specifications through geometric adaptation, ensuring that the spring axis strictly coincides with the force direction of the pressure plate 9, reducing the lateral shear force caused by misalignment, and reducing the risk of inelastic deformation of the spring by about 40%; the matching fixing groove 6 at the bottom of the pressure plate 9 is linked with the stroke of the piston 8 to complete the spring end face fitting in the pre-stressing stage, eliminating the impact load caused by the assembly gap, and making the pressurization process smoother; the segmented control characteristics of the multi-stage pressure valve group combined with the stroke ratio design of the hydraulic cylinder 7 can not only meet the maximum compression requirement of the spring, but also avoid energy waste caused by excessive stroke, and can save 15% of hydraulic energy consumption compared with conventional designs.

[0066] The pressure adjustment range of the hydraulic pressure system 3 is 0-50MPa, and the adjustment accuracy range is ±0.5MPa; the ratio of the stroke of the piston 8 of the hydraulic cylinder 7 to the maximum compression of the spring is 1:1.1-1:1.3;

[0067] The pressure adjustment range of 0-50MPa covers the full range of requirements from light suspension springs to heavy industrial shock absorber springs. The precision control of ±0.5MPa is achieved through a high-response servo valve to ensure precise stay near the spring yield point. The ratio of the piston 8 stroke to the maximum compression of the spring is limited based on experimental verification: when the ratio is less than 1.1, incomplete compression may occur due to insufficient margin; when the ratio is greater than 1.3, the energy consumption of invalid stroke is increased; therefore, this ratio design makes the effective compression section of the spring account for more than 90%, while controlling the lateral deformation within 0.5% of the spring diameter.

[0068] Also includes:

[0069] Displacement sensor module: installed on the fixed frame 1 and connected to the main control unit 4, used to monitor the spring compression in real time;

[0070] Temperature compensation module: dynamically adjusts the pressure output of the hydraulic pressure system 3 according to the ambient temperature;

[0071] The protection mechanism 10 is slidably disposed on the fixed frame 1, and includes slide grooves provided on both sides of the fixed frame 1, a protection net slidably connected in the slide groove and capable of moving linearly along the slide groove, and a locking assembly for locking the protection net; the protection mechanism 10 is used to prevent the spring from popping out when the spring is in the fixed position, so as to avoid causing harm to the operator and the surrounding equipment;

[0072] The displacement sensing module (such as LVDT or laser rangefinder) monitors the spring compression in real time with a resolution of 0.01 mm, constructs a complete stress-strain curve in combination with pressure data, and can identify spring material defects. The defect detection rate is increased by 60% compared with single pressure monitoring; the temperature compensation module collects the ambient temperature through a PT100 sensor, corrects the pressure deviation caused by the change of hydraulic oil viscosity according to the coefficient of 0.005 / °C, and reduces the system control error to within ±1% under the working conditions of -20°C to 60°C; the sliding protective net realizes rapid opening and closing through the chute mechanism, meeting the requirements for protecting dangerous areas.

[0073] A control method for a spring standing device of a shock absorber, characterized by comprising the following steps:

[0074] S1. System initialization:

[0075] Start the self-check program, check the status of each mechanism and calibrate the pressure sensing module and the displacement sensing module;

[0076] S2. Parameter input:

[0077] Input into the main control unit 4: set the target pressure value Xt, the target pressure holding time Tt, the allowable pressure deviation △X, and the compression threshold Ymax;

[0078] S3. Fix the spring:

[0079] First, move the protective net upward and fix the protective net through the locking component to expose the spring fixing mechanism 2 for easy installation of the spring. Then, place the spring to be stood on the fixing groove 6 on the fixing plate 5, and then unlock the locking component and lower the protective net so that the protective net covers the outside of the spring fixing mechanism 2;

[0080] S4. Pre-pressurization stage:

[0081] The main control unit 4 pre-presses the spring with the hydraulic cylinder 7 at a pressure of 10% Xt, so that the fixing groove 6 on the pressing plate 9 at the bottom of the piston 8 abuts against the top of the spring to eliminate the assembly gap. At this time, record the initial compression amount Y0, and at the same time set the reference temperature K0;

[0082] S5. Multi-stage pressurization:

[0083] Process 1: The main control unit 4 controls the hydraulic pressure application system 3 to quickly pressurize to 50% Xt in the coarse adjustment mode. If the pressure fluctuation exceeds 20% △X, suspend the pressurization and correct the oil circuit flow rate;

[0084] Process 2: Switch to the fine adjustment mode and pressurize in 5% Xt gradients to 80% Xt. The residence time T for each stage is 2(Y1 - Y0) / V, where Y1 is the current compression amount and V is the compression rate;

[0085] Process three: Pressurize to Xt, and calculate the slope of the pressure-compression curve in real time. If the slope deviates from the theoretical value by ±15%, an abnormal alarm is triggered;

[0086] S6. Pressure holding determination:

[0087] If X1 satisfies |X1 - Xt| ≤ ΔX, start the pressure holding timer, where X1 is the current pressure;

[0088] If the pressure fluctuation exceeds 50%ΔX three times continuously during pressure holding, reset the timer and fine-tune the hydraulic valve;

[0089] S7. Deformation stability detection:

[0090] When the pressure holding time reaches 80%Tt, calculate the compression rate of change dY / dt. If dY / dt < 0.005mm / s and lasts for 10s, it is determined that the deformation is stable; otherwise, extend the pressure holding time to 120%Tt;

[0091] S8. Temperature compensation:

[0092] Monitor the ambient temperature K1 in real time. If |K1 - K0| ≥ 5°C, correct the target pressure according to Xs = Xt[1 - 0.005(K1 - K0)];

[0093] S9. Pressure relief:

[0094] Adopt stepped pressure relief, with each pressure relief amplitude of 5%Xt and an interval of 3s between each stage to prevent the spring from rebounding;

[0095] S10. Remove the spring:

[0096] When all pressure relief is completed, the main control unit 4 controls the suspension of the device operation. The operator moves the protective net upward and fixes the protective net through the locking component to expose the spring fixing mechanism 2, and then takes out the completed spring;

[0097] The multi-stage pressurization strategy adopts three-stage progressive loading of coarse adjustment (50% target pressure) - fine adjustment (80% target pressure) - precise adjustment (100% target pressure), effectively avoiding the overshoot phenomenon of the spring in the plastic deformation zone. Among them, the gradient residence time formula T = 2(Y1 - Y0) / V is designed based on the spring creep characteristics, enabling the material stress to be fully relaxed, reducing the residual stress by 30%. The slope monitoring of the pressure-compression curve can identify the non-linear deformation of the spring. When the slope deviation exceeds ±15%, an alarm is immediately triggered to prevent systematic process errors in mass production. The stepped pressure relief controls the opening of the oil circuit throttle valve to limit the spring rebound speed within 0.2m / s, avoiding equipment vibration and spring surface scratches caused by sudden release.

[0098] In S6, the pressure fluctuation fine-tuning adopts the PID algorithm, with a proportional coefficient = 0.8, an integral time = 2 s, and a derivative time = 0.5 s;

[0099] The PID control parameters are optimized for the non-linear characteristics of the hydraulic pressing system 3: the proportional coefficient of 0.8 avoids pressure oscillations caused by overshoot; the integral time of 2 s effectively eliminates the steady-state error; the derivative time of 0.5 s suppresses the slow disturbance caused by the change in oil temperature; this parameter combination improves the response speed by 40% compared to the conventional PID in the spring setting scenario, and reduces the overshoot to less than 1.5%; in addition, the calculus separation algorithm automatically switches to the PI mode during the pressure holding stage to avoid the amplification effect of the derivative term on the sensor noise.

[0100] It also includes an emergency pressure relief mode: when the pressure > 120% Xt or the compression amount > 110% Ymax, the hydraulic pressing system 3 relieves pressure to a safe value within 0.5 s - 1 s;

[0101] When the pressure is exceeded, the piezoelectric high-speed pressure relief valve can reduce the system pressure to a safe value within 0.5 s - 1 s, and the response speed is 3 times faster than that of the solenoid valve; when the compression amount is exceeded, the mechanical overflow valve and the electrical control provide redundant protection to ensure that even if the main control fails, the oil circuit can still be physically cut off; the experimental data shows that this mechanism can reduce the debris splash range during spring breakage by 80%, and also greatly reduces the risk of operator injury. The self-check program after pressure relief automatically records the fault parameters, providing data support for process optimization.

[0102] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any ordinary changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A spring setting device for a shock absorber, characterized in that: include: Fixed frame (1): arranged on a horizontal plane to support other components; Spring fixing mechanism (2): installed at the bottom of the fixing frame (1) and used to fix springs of different specifications; A hydraulic pressure system (3) is installed on the top of the fixed frame (1) and is used to apply a controllable compression force to the spring; A pressure sensing module: arranged between the spring fixing mechanism (2) and the hydraulic pressure application system (3), and used for real-time monitoring of the pressure applied to the spring; The main control unit (4) is used to receive data from the pressure sensing module, dynamically adjust the hydraulic pressure system (3) according to the data from the pressure sensing module, and trigger the standing operation when the preset conditions are met.

2. A spring setting device for a shock absorber according to claim 1, characterized in that: The spring fixing mechanism (2) comprises a fixing plate (5) mounted on the frame and used to provide support, and a fixing groove (6) adapted to the outer diameter of the spring and capable of accommodating the spring is provided on the fixing plate (5); The hydraulic pressure system (3) comprises a hydraulic cylinder (7) mounted on a frame, a piston (8) arranged in the hydraulic cylinder (7), a pressure plate (9) mounted on the bottom end of the piston (8) and having a fixing groove (6) on the bottom surface thereof adapted to the outer diameter of the spring and capable of accommodating the spring, and a pressure valve group.

3. A spring setting device for a shock absorber according to claim 2, characterized in that: The pressure adjustment range of the hydraulic pressure system (3) is 0-50MPa, and the adjustment accuracy range is ±0.5MPa; the ratio of the stroke of the piston (8) of the hydraulic cylinder (7) to the maximum compression of the spring is 1:1.1-1:1.

3.

4. A spring setting device for a shock absorber according to claim 1, characterized in that: Also includes: Displacement sensor module: installed on the fixed frame (1) and connected to the main control unit (4), used for real-time monitoring of the spring compression; Temperature compensation module: dynamically adjusts the pressure output of the hydraulic pressure system (3) according to the ambient temperature; The protective mechanism (10) is slidably arranged on the fixed frame (1), and comprises sliding grooves provided on both sides of the fixed frame (1), a protective net slidably connected in the sliding groove and capable of moving linearly along the sliding groove, and a locking component for locking the protective net; the protective mechanism is used to prevent the spring from popping out when the spring is in a fixed position, so as to avoid causing harm to the operator and the surrounding equipment.

5. A control method for a spring setting device for a shock absorber according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. System initialization: Start the self-test program, check the status of each mechanism and calibrate the pressure sensing module and displacement sensing module; S2. Parameter input: Input into the main control unit (4): set target pressure value Xt, target pressure holding time Tt, allowable pressure deviation △X, and compression threshold value Ymax; S3, fixed spring: First, the protective net is moved upward and fixed by a locking assembly, so that the spring fixing mechanism (2) is exposed, which is convenient for installing the spring. Then, the spring to be fixed is placed in the fixing groove (6) on the fixing plate (5). Then, the locking assembly is unlocked, and the protective net is dropped, so that the protective net cover is arranged outside the spring fixing mechanism (2). S4, pre-pressurization stage: The hydraulic cylinder (7) is pre-compressed with a 10% Xt pressure by the main control unit (4) so ​​that the fixing groove (6) on the pressure plate (9) at the bottom of the piston (8) contacts the top of the spring to eliminate the assembly gap. At this time, the initial compression amount Y0 is recorded and the reference temperature K0 is set; S5, multi-stage pressurization: Process 1: The main control unit (4) controls the hydraulic pressure system (3) to quickly increase the pressure to 50% Xt in a coarse adjustment mode. If the pressure fluctuation exceeds 20% △X, the pressure is suspended and the oil flow is corrected; Process 2: Switch to fine adjustment mode, pressurize from 5%Xt to 80%Xt, and the residence time of each level is T=2(Y1-Y0) / V, where Y1 is the current compression amount and V is the compression rate; Process 3: Pressurize to Xt, calculate the slope of the pressure-compression curve in real time, and trigger an abnormal alarm if the slope deviates from the theoretical value by ±15%; S6. Pressure holding judgment: If X1 satisfies |X1-Xt|≤△X, the pressure holding timer is started, where X1 is the current pressure; If the pressure fluctuation exceeds 50% △X three times in a row during the pressure holding period, reset the timing and fine-tune the hydraulic valve; S7, deformation stability test: When the holding time reaches 80% Tt, calculate the compression change rate dY / dt. If dY / dt < 0.005 mm / s and lasts for 10 seconds, the deformation is determined to be stable; otherwise, extend the holding time to 120% Tt; S8, Temperature compensation: Monitor the ambient temperature K1 in real time. If |K1-K0|≥5°C, correct the target pressure according to Xs=Xt[1-0.005(K1-K0)]; S9, pressure relief release: Adopt stepped pressure relief, each level of pressure relief is 5%Xt, and each level is separated by 3s to prevent spring rebound; S10. Remove the spring: When all the pressure relief is completed, the main control unit (4) controls the operation of the pause device, and the operator moves the protective net upwards and fixes the protective net through the locking assembly to expose the spring fixing mechanism (2), and then takes out the spring that has been fixed.

6. The control method of the spring setting device for a shock absorber according to claim 5, characterized in that: In S6, the pressure fluctuation fine-tuning adopts the PID algorithm, with a proportional coefficient of 0.8, an integral time of 2s, and a differential time of 0.5s.

7. The control method of the spring setting device for a shock absorber according to claim 6, characterized in that: It also includes an emergency pressure relief mode: when the pressure is greater than 120% Xt or the compression is greater than 110% Ymax, the hydraulic pressure system (3) will relieve the pressure to a safe value within 0.5s-1s.

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