Electric cylinder for hydraulic tail plate

Abstract

The invention discloses an electric cylinder for a hydraulic tail plate, and relates to the technical field of electric cylinders. Through cooperation of the shell and the U-shaped seat, the hinge seat can be conveniently and quickly mounted and dismounted, and the maintenance efficiency is improved; through cooperation of a limiting ring and a lead screw, stable lifting of the jacking shaft is facilitated, and the stability of the tail plate is improved; by monitoring and analyzing operation data of the servo motor in real time, the friction loss and the axial displacement change between the lead screw and the jacking shaft are accurately calculated, and whether the rotating speed or the torque needs to be adjusted or not is automatically judged, so that accurate control over the lifting action of the hydraulic tail plate is achieved, it is ensured that the tail plate can stably and accurately operate under different working conditions, and the working efficiency is improved. The efficiency and safety of cargo loading and unloading are improved, the situation that the lead screw and the jacking shaft are rapidly abraded due to excessive friction is avoided, the overall service life of the electric cylinder is prolonged, the equipment replacement frequency is reduced, and the equipment maintenance cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of electric cylinders, and in particular to an electric cylinder used for a hydraulic tailgate. Background Art

[0002] The main functions of electric cylinders are reflected in many aspects. In industrial automation production, such as the assembly line of electronic products, electric cylinders can accurately control the position of mechanical arms, fixtures and other components according to preset programs, realize high-precision assembly of parts and components, and ensure the stability of product quality; in the field of CNC machine tools, it can accurately adjust the position of tools to ensure processing accuracy; in the logistics and warehousing industry, electric cylinders can drive the cargo platform to achieve lifting, translation and other actions, facilitate the stacking and handling of goods, carry the corresponding weight of goods, and help efficient logistics operation; like the shelf handling equipment in the stereoscopic warehouse, it often relies on electric cylinders to drive the shelf to move to meet the needs of cargo storage and retrieval; The electric cylinder used in the hydraulic tailgate needs to carry heavy cargo for a long time and multiple times, which may cause the connection between the electric cylinder and the vehicle to break. When the connection between the electric cylinder breaks, the entire electric cylinder needs to be replaced, while the drive inside the electric cylinder is not damaged, resulting in unnecessary waste; In the prior art, the traditional electric cylinder lacks effective monitoring and intelligent control means for the internal operating status during operation, and cannot timely understand the friction between the screw and the lifting shaft, as well as the impact of wear caused by friction on equipment performance; when the friction loss increases or the axial displacement changes beyond a reasonable range due to wear, it is easy to cause inaccurate lifting of the lifting shaft, affecting the normal operation of the hydraulic tail plate; and when problems occur in the equipment, manual troubleshooting is often required, which is not only inefficient, but also may cause increased maintenance costs and delays in cargo loading and unloading due to the failure to find problems in time; Therefore, improvements need to be made based on the above problems. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings in the prior art and to propose an electric cylinder used for a hydraulic tailgate.

[0004] In order to achieve the above-mentioned object, the present invention adopts the following technical scheme: an electric cylinder used for a hydraulic tailboard, comprising a tube body, a tube sleeve is fixedly connected to the top surface of the tube body, a guide opening is opened on the top surface of the tube sleeve, a copper tube is fixedly connected in the guide opening of the top surface of the tube sleeve, and a shell is fixedly connected to the bottom surface of the tube body, a servo motor is arranged inside the shell, and the servo motor is mounted on the bottom surface of the tube body; A servo motor controller is arranged on the outer wall of the servo motor, and a collection module, an analysis module and a warning module are arranged inside the servo motor controller; The acquisition module detects the speed, torque and running time data of the servo motor, and transmits the detected speed, torque and running time data to the analysis module; The analysis module processes and analyzes the speed and torque data of the servo motor, calculates the friction loss and axial displacement change between the screw and the lifting shaft, generates an adjustment signal when the friction loss exceeds the loss threshold, and transmits the adjustment signal to the warning module; generates a replacement warning signal when the axial displacement change exceeds the displacement threshold, and transmits the replacement warning signal to the warning module; The warning module receives the adjustment signal and adjusts the speed or torque according to the preset ratio; it receives the replacement warning signal and sends out an audible and visual alarm through the warning light to notify the staff to replace the screw rod and the jacking shaft.

[0005] Preferably, a screw rod is vertically provided inside the tube body, a bearing is fixedly connected to the lower end of the screw rod, the bearing is installed on the inner bottom surface of the tube body, a lifting shaft is vertically provided inside the tube body, a first thread groove is provided on the bottom surface of the lifting shaft, the screw rod is threadedly connected to the lifting shaft, a sleeve is fixedly connected to the top surface of the lifting shaft, and a connecting screw is fixedly connected to the middle of the top surface of the sleeve.

[0006] Preferably, the output shaft of the servo motor passes through the tube body, and the output shaft of the servo motor is connected to the screw rod through a coupling.

[0007] Preferably, a plurality of equally spaced limiting grooves are vertically opened on the inner wall of the tube body, and a limiting ring is horizontally provided inside the tube body, the outer side of the limiting ring is placed in the limiting groove to slide, and the limiting ring is installed at the lower end of the lifting shaft.

[0008] Preferably, T-shaped grooves are provided on both sides of the bottom surface of the shell, and a second thread groove is provided in the middle of the bottom surface of the shell.

[0009] Preferably, a U-shaped seat is provided at the lower end of the shell, T-shaped blocks are fixedly connected at both ends of the U-shaped seat, the T-shaped blocks are placed in T-shaped grooves, and a guide opening is opened in the middle of the U-shaped seat, a positioning screw is provided in the guide opening, the upper end of the positioning screw is threadedly connected to the shell, a positioning nut is provided between the shell and the U-shaped seat, the positioning nut is threadedly connected to the positioning screw, and a hinged seat is fixedly connected to the bottom surface of the positioning screw.

[0010] Preferably, the analysis module performs the following steps to analyze the speed and torque data: Step 1: retrieve the historical speed data of the servo motor, preset the speed fluctuation gap, calculate the average of the historical speed data, take the speed average as the basic speed, divide the historical speed data according to the speed fluctuation gap, and count the number of detected speed data of the historical speed data in each divided segment after division. If the number of detected speed data of the non-basic speed division segment is less than the product of the preset ratio and the number of detected speed data of the basic speed division segment, it is determined that the speed data of the non-basic speed division segment has little influence on the judgment of the detected speed data, and the detected speed data of the basic speed division segment is used as the detected speed data. ; Perform the same processing on the torque and running time data to obtain the detected torque data and instrumentation runtime data ; Step 2: In steady state, the axial force on the screw The relationship between the motor output torque and , is the pitch of the screw; the relative sliding speed between the screw and the lifting shaft , friction loss power between the screw and the lifting shaft , is the friction coefficient, then when testing the running time data The total friction loss energy , if during operation, the speed data is detected And detect torque data Stable, total friction loss energy Can be simplified to ; Step 3: When it is detected that the friction loss power is greater than the preset friction loss power threshold, it is determined that continued rotation will cause greater friction loss between the lifting shaft and the screw rod, an adjustment signal is generated, and the adjustment signal is transmitted to the warning module.

[0011] Preferably, the analysis module determines the speed and torque adjustment steps as follows: Step 1: After determining that a large friction loss will be caused, analyze the relationship between friction loss power, speed and torque, stabilize the torque, reduce the speed according to the set ratio, and calculate the change in friction loss power after each adjustment. , is the number of speed adjustments; calculate the average value of the friction loss power change after each adjustment , and then calculate the change in friction loss power after each adjustment The difference is calculated with the average value of the friction loss power change after each adjustment, and the speed data corresponding to the group of data with the smallest difference is taken and marked as the optimal speed data; Step 2: Stabilize the torque, reduce the torque according to the set ratio, and calculate the change in friction loss power , The optimal torque data is obtained for the number of torque adjustments; the speed data and torque data corresponding to the calculated friction loss power data are compared with the optimal speed data and the optimal torque data, and the differences are calculated respectively. If the absolute value of the difference between the speed data and the optimal speed data is greater than the absolute value of the difference between the torque data and the optimal torque data, the speed is adjusted; otherwise, the torque is adjusted.

[0012] Preferably, the analysis module determines the axial displacement change in the following steps: Step 1: Total friction loss energy , Material hardness and wear amount The relationship between , is the wear coefficient; radial wear depth caused by wear , is the diameter of the screw, is the contact length between the lifting shaft and the screw rod; due to the change in the clearance fit between the screw rod and the lifting shaft and the change in the surface state after wear, the lifting shaft undergoes an axial displacement change relative to the screw rod. , is the preset correction factor, is the screw pitch; Step 2: Compare the calculated axial displacement change data with the preset axial displacement change threshold. If the calculated axial displacement change data is greater than the preset axial displacement change threshold, it is determined that the change in the axial displacement will obviously cause a displacement change between the lifting shaft and the screw rod, making the rotation of the screw rod inaccurate for the displacement of the lifting shaft, resulting in inaccurate adjustment of the hydraulic tail plate, generating a replacement warning signal, and transmitting the replacement warning signal to the warning module.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The cooperation between the housing and the U-shaped seat facilitates the quick installation and removal of the articulated seat, thereby improving the maintenance efficiency; the cooperation between the housing and the positioning screw facilitates the installation of the articulated seat, thereby improving the convenience of the installation of the articulated seat; the cooperation between the positioning screw and the positioning nut facilitates the connection between the U-shaped seat and the articulated seat, thereby improving the stability of the articulated seat and the connection effect of the articulated seat; the cooperation between the limit ring and the screw rod facilitates the stable lifting and lowering of the jacking shaft, thereby improving the stability of the tail plate; the cooperation between the pipe sleeve and the shaft sleeve facilitates the maintenance of the electric cylinder, thereby improving the maintenance efficiency; 2. Through real-time monitoring and analysis of the servo motor operation data, the friction loss and axial displacement change between the screw and the lifting shaft are accurately calculated, and the speed or torque needs to be adjusted automatically, so as to achieve precise control of the hydraulic tailgate lifting action, ensure that the tailgate can operate stably and accurately under different working conditions, improve the efficiency and safety of cargo loading and unloading, and avoid rapid wear of the screw and the lifting shaft due to excessive friction, extend the overall service life of the electric cylinder, reduce the frequency of equipment replacement, and reduce equipment maintenance costs; 3. Through the preset friction loss power threshold and axial displacement change threshold, the system can issue early warning before serious problems occur in the equipment, avoid production interruptions due to equipment failure, improve the reliability and stability of equipment operation, and reduce economic losses caused by sudden equipment failure; the entire process does not require continuous manual monitoring and frequent intervention, and the system automatically completes data collection, analysis, judgment and adjustment operations, reducing the tediousness and errors of manual operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 It is a schematic diagram of the overall three-dimensional structure proposed by the present invention; Figure 2 It is a schematic diagram of the overall cross-sectional three-dimensional structure proposed by the present invention; Figure 3 This is a schematic diagram of the three-dimensional structure of the lifting shaft and the limiting ring proposed by the present invention; Figure 4 The present invention proposes Figure 2 A schematic diagram of the enlarged structure of the middle A part; Figure 5 The present invention proposes Figure 2 A schematic diagram of the structure of the middle B part; Figure 6 It is a system flow chart of the present invention.

[0015] Serial numbers in the figure: 1. Tube body; 2. Tube sleeve; 3. Shell; 4. Copper tube; 5. Screw; 6. Bearing; 7. Servo motor; 8. Lifting shaft; 9. Bushing; 10. Connecting screw; 11. Limiting groove; 12. Limiting ring; 13. U-shaped seat; 14. Positioning screw; 15. Articulated seat; 16. Positioning nut. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0017] Example: See Figure 1-6 The electric cylinder used for the hydraulic tailboard in the present invention comprises a tube body 1, a tube sleeve 2 is fixedly connected to the top surface of the tube body 1, a guide opening is opened on the top surface of the tube sleeve 2, and a copper tube 4 is fixedly connected to the guide opening on the top surface of the tube sleeve 2, and a shell 3 is fixedly connected to the bottom surface of the tube body 1, a servo motor 7 is arranged inside the shell 3, and the servo motor 7 is mounted on the bottom surface of the tube body 1; the tube sleeve 2 and the shell 3 are conveniently installed through the tube body 1; the copper tube 4 is conveniently installed through the tube sleeve 2; the lifting shaft 8 is conveniently guided out through the copper tube 4; the rotation of the screw rod 5 is conveniently controlled through the servo motor 7; a screw rod 5 is vertically arranged inside the tube body 1, and a shaft is fixedly connected to the lower end of the screw rod 5 Bearing 6 is installed on the inner bottom surface of the tube body 1, and a lifting shaft 8 is vertically arranged inside the tube body 1. The bottom surface of the lifting shaft 8 is provided with a first thread groove, and the screw rod 5 is threadedly connected to the lifting shaft 8, and a sleeve 9 is fixedly connected to the top surface of the lifting shaft 8, and a connecting screw 10 is fixedly connected to the middle of the top surface of the sleeve 9; the lifting and lowering of the lifting shaft 8 can be easily controlled by the screw rod 5; the rotation of the screw rod 5 can be facilitated by the bearing 6; the installation of the connecting screw 10 can be facilitated by the sleeve 9; the connection of the lifting shaft 8 can be facilitated by the connecting screw 10; the output shaft of the servo motor 7 passes through the tube body 1, and the output shaft of the servo motor 7 is connected to the screw rod 5 through a coupling.

[0018] In the present invention, a plurality of equally spaced limiting grooves 11 are vertically provided on the inner wall of the tube body 1, and a limiting ring 12 is horizontally provided inside the tube body 1, the outer side of the limiting ring 12 is placed in the limiting groove 11 to slide, and the limiting ring 12 is installed at the lower end of the lifting shaft 8; the limiting groove 11 and the limiting ring 12 facilitate the lifting and lowering guidance of the lifting shaft 8; T-shaped grooves are provided on both sides of the bottom surface of the shell 3, and a second threaded groove is provided in the middle of the bottom surface of the shell 3; a U-shaped seat 13 is provided at the lower end of the shell 3, and T-shaped blocks are fixedly connected to both ends of the U-shaped seat 13, and the T-shaped blocks are placed in the T-shaped grooves A guide port is provided in the middle of the U-shaped seat 13, a positioning screw 14 is provided in the guide port, the upper end of the positioning screw 14 is threadedly connected to the outer shell 3, a positioning nut 16 is provided between the outer shell 3 and the U-shaped seat 13, the positioning nut 16 is threadedly connected to the positioning screw 14, and a hinge seat 15 is fixedly connected to the bottom surface of the positioning screw 14; the positioning screw 14 is conveniently installed through the U-shaped seat 13; the hinge seat 15 is conveniently connected through the positioning screw 14; the positioning screw 14 is conveniently fixed through the positioning nut 16; the pipe body 1 is conveniently installed through the hinge seat 15.

[0019] A servo motor controller is arranged on the outer side wall of the servo motor 7, and a collection module, an analysis module and a warning module are arranged inside the servo motor controller; During the operation of the servo motor 7, the screw rod 5 is driven to rotate to move the position of the lifting shaft 8. During the rotation of the screw rod 5, the speed, torque and running time data of the servo motor 7 are detected by the sensor; The historical speed data of the servo motor 7 is retrieved, the speed fluctuation gap is preset, the historical speed data is averaged, the speed average is used as the basic speed, the historical speed data is divided according to the speed fluctuation gap, and the number of detected speed data of the historical speed data in each divided segment after the division is counted. If the number of detected speed data of the non-basic speed division segment is less than the product of the preset ratio and the number of detected speed data of the basic speed division segment, it is determined that the speed data of the non-basic speed division segment has little influence on the judgment of the detected speed data, and the detected speed data of the basic speed division segment is used as the detected speed data. ; Perform the same processing on the torque and running time data to obtain the detected torque data and instrumentation runtime data ; In the steady state, the axial force on the screw 5 is The relationship between the motor output torque and , is the pitch of the screw rod 5; the relative sliding speed between the screw rod 5 and the lifting shaft 8 , the friction loss power between the screw 5 and the lifting shaft 8 , is the friction coefficient, then when testing the running time data The total friction loss energy , if during operation, the speed data is detected And detect torque data Stable, total friction loss energy Can be simplified to ; When it is detected that the friction loss power is greater than the preset friction loss power threshold, it is determined that continued rotation will cause friction loss between the lifting shaft 8 and the screw rod 5, an adjustment signal is generated, and the adjustment signal is transmitted to the warning module; After determining that it will cause a large friction loss, analyze the relationship between friction loss power, speed and torque, stabilize the torque, reduce the speed according to the set ratio, and calculate the change in friction loss power after each adjustment , is the number of speed adjustments; calculate the average value of the friction loss power change after each adjustment , and then calculate the change in friction loss power after each adjustment Calculate the difference with the mean value of the friction loss power change after each adjustment, take the speed data corresponding to the smallest difference, and mark it as the optimal speed data; stabilize the torque, reduce the torque according to the set ratio, and calculate the change of friction loss power , The optimal torque data is obtained for the torque adjustment times; the speed data and torque data corresponding to the calculated friction loss power data are compared with the optimal speed data and the optimal torque data, and the difference is calculated respectively. If the absolute value of the difference between the speed data and the optimal speed data is greater than the absolute value of the difference between the torque data and the optimal torque data, the speed is adjusted; otherwise, the torque is adjusted; Total friction loss energy , Material hardness and wear amount The relationship between , is the wear coefficient; radial wear depth caused by wear , is the diameter of the screw 5, is the contact length between the lifting shaft 8 and the screw 5; due to the change in the clearance fit between the screw 5 and the lifting shaft 8 and the change in the surface state after wear, the lifting shaft 8 changes in axial displacement relative to the screw 5. , is the preset correction factor, is the pitch of the screw rod 5; The calculated axial displacement change data is compared with the preset axial displacement change threshold. If the calculated axial displacement change data is greater than the preset axial displacement change threshold, it is determined that the change in the axial displacement will obviously cause a displacement change between the lifting shaft 8 and the screw rod 5, making the rotation of the screw rod 5 inaccurate for the displacement of the lifting shaft 8, resulting in inaccurate adjustment of the hydraulic tail plate, generating a replacement warning signal, and transmitting the replacement warning signal to the warning module.

[0020] Working principle: When the present invention is used, the tube body 1 is first installed on the rear end of the vehicle through the hinge seat 15, and then connected to the tail board through the connecting screw 10, and then the servo motor 7 is connected to the wire and powered on. When it is necessary to control the tail board to open or close, the servo motor 7 is started, and the screw rod 5 is controlled to rotate by the servo motor 7, and the screw rod 5 is threadedly connected to the lifting shaft 8, and then placed in the limiting groove 11 through the outer side of the limiting ring 12. When the screw rod 5 rotates, the lifting shaft 8 is controlled to rise and fall, thereby controlling the tail board to open or close; when the gravity borne by the electric cylinder is too large and its hinge seat 15 is broken, it is only necessary to rotate the positioning nut 16 to move the positioning nut 16 away from the U-shaped seat 13, and then rotate the hinge seat 15, thereby rotating the positioning screw 14, and then disengaging the positioning screw 14 from the housing 3, and then removing the U-shaped seat 13 from the T-slot, and then reinstalling the new U-shaped seat 13 and the hinge seat 15 on the housing 3.

[0021] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An electric cylinder for a hydraulic tailgate, comprising a tube body (1), characterized in that: The top surface of the tube body (1) is fixedly connected to a tube sleeve (2), the top surface of the tube sleeve (2) is provided with a guide opening, a copper tube (4) is fixedly connected inside the guide opening of the top surface of the tube sleeve (2), and the bottom surface of the tube body (1) is fixedly connected to a shell (3), a servo motor (7) is provided inside the shell (3), and the servo motor (7) is mounted on the bottom surface of the tube body (1); A servo motor controller is arranged on the outer wall of the servo motor (7), and a collection module, an analysis module and a warning module are arranged inside the servo motor controller; An acquisition module detects the speed, torque and running time data of the servo motor (7), and transmits the detected speed, torque and running time data to the analysis module; an analysis module, processing and analyzing the speed and torque data of the servo motor (7), calculating the friction loss and axial displacement change between the screw rod (5) and the lifting shaft (8), generating an adjustment signal when the friction loss exceeds a loss threshold, and transmitting the adjustment signal to the warning module; generating a replacement warning signal when the axial displacement change exceeds a displacement threshold, and transmitting the replacement warning signal to the warning module; The warning module receives the adjustment signal and adjusts the rotation speed or torque according to a preset ratio; receives the replacement warning signal and issues an audible and visual alarm through a warning light to notify the staff to replace the screw rod (5) and the lifting shaft (8).

2. The electric cylinder used for the hydraulic tailgate according to claim 1, characterized in that: A screw rod (5) is vertically arranged inside the tube body (1), a bearing (6) is fixedly connected to the lower end of the screw rod (5), and the bearing (6) is mounted on the inner bottom surface of the tube body (1). A lifting shaft (8) is vertically arranged inside the tube body (1), a first thread groove is formed on the bottom surface of the lifting shaft (8), the screw rod (5) is threadedly connected to the lifting shaft (8), a shaft sleeve (9) is fixedly connected to the top surface of the lifting shaft (8), and a connecting screw rod (10) is fixedly connected to the middle of the top surface of the shaft sleeve (9).

3. The electric cylinder used for the hydraulic tailgate according to claim 2, characterized in that: The output shaft of the servo motor (7) passes through the tube body (1), and the output shaft of the servo motor (7) is connected to the screw rod (5) via a coupling.

4. The electric cylinder used for the hydraulic tailgate according to claim 3, characterized in that: The inner wall of the tube body (1) is vertically provided with a plurality of equally spaced limit grooves (11), and a limit ring (12) is horizontally provided inside the tube body (1), the outer side of the limit ring (12) is placed in the limit groove (11) to slide, and the limit ring (12) is installed at the lower end of the lifting shaft (8).

5. The electric cylinder used for the hydraulic tailgate according to claim 4, characterized in that: T-shaped grooves are provided on both sides of the bottom surface of the shell (3), and a second thread groove is provided in the middle of the bottom surface of the shell (3).

6. The electric cylinder used for the hydraulic tailgate according to claim 5, characterized in that: A U-shaped seat (13) is provided at the lower end of the shell (3), and T-shaped blocks are fixedly connected to both ends of the U-shaped seat (13). The T-shaped blocks are placed in the T-shaped grooves, and a guide opening is opened in the middle of the U-shaped seat (13). A positioning screw (14) is provided in the guide opening, and the upper end of the positioning screw (14) is threadedly connected to the shell (3). A positioning nut (16) is provided between the shell (3) and the U-shaped seat (13), and the positioning nut (16) is threadedly connected to the positioning screw (14), and a hinge seat (15) is fixedly connected to the bottom surface of the positioning screw (14).

7. The electric cylinder used for the hydraulic tailgate according to claim 6, characterized in that: The analysis module performs the following steps to analyze the speed and torque data: Step 1: retrieve the historical speed data of the servo motor (7), preset the speed fluctuation difference, calculate the average of the historical speed data, take the speed average as the basic speed, divide the historical speed data according to the speed fluctuation difference, count the number of detected speed data of the historical speed data in each divided section after the division, if the number of detected speed data of the non-basic speed division section is less than the product of the preset ratio and the number of detected speed data of the basic speed division section, then it is determined that the speed data of the non-basic speed division section has little influence on the judgment of the detected speed data, and the detected speed data of the basic speed division section is used as the detected speed data. ; Perform the same processing on the torque and running time data to obtain the detected torque data and instrumentation runtime data ; Step 2: In steady state, the axial force on the screw (5) The relationship between the motor output torque and , is the pitch of the screw rod (5); the relative sliding speed between the screw rod (5) and the lifting shaft (8) , the friction loss power between the screw (5) and the lifting shaft (8) , is the friction coefficient, then when testing the running time data The total friction loss energy , if during operation, the speed data is detected And detect torque data Stable, total friction loss energy Can be simplified to ; Step 3: When it is detected that the friction loss power is greater than a preset friction loss power threshold, it is determined that continued rotation will cause friction loss between the lifting shaft (8) and the screw rod (5), an adjustment signal is generated, and the adjustment signal is transmitted to the warning module.

8. The electric cylinder used for the hydraulic tailgate according to claim 7, characterized in that: The analysis module determines the speed and torque adjustment steps as follows: Step 1: Determine whether it will cause large friction loss, then analyze the relationship between friction loss power, speed and torque, stabilize the torque, reduce the speed according to the set ratio, and calculate the change in friction loss power after each adjustment , is the number of speed adjustments; calculate the average value of the friction loss power change after each adjustment , and then calculate the change in friction loss power after each adjustment The difference is calculated with the average value of the friction loss power change after each adjustment, and the speed data corresponding to the group of data with the smallest difference is taken and marked as the optimal speed data; Step 2: Stabilize the torque, reduce the torque according to the set ratio, and calculate the change in friction loss power , The optimal torque data is obtained for the number of torque adjustments; the speed data and torque data corresponding to the calculated friction loss power data are compared with the optimal speed data and the optimal torque data, and the differences are calculated respectively. If the absolute value of the difference between the speed data and the optimal speed data is greater than the absolute value of the difference between the torque data and the optimal torque data, the speed is adjusted; otherwise, the torque is adjusted.

9. The electric cylinder used for the hydraulic tailgate according to claim 8, characterized in that: The analysis module determines the change in axial displacement in the following steps: Step 1: Total friction loss energy , Material hardness and wear amount The relationship between , is the wear coefficient; radial wear depth caused by wear , is the diameter of the screw (5), is the contact length between the lifting shaft (8) and the screw rod (5); due to the change in the clearance fit between the screw rod (5) and the lifting shaft (8) and the change in the surface state after wear, the lifting shaft (8) undergoes an axial displacement change relative to the screw rod (5). , is the preset correction factor, is the pitch of the screw rod (5); Step 2: Compare the calculated axial displacement change data with a preset axial displacement change threshold value. If the calculated axial displacement change data is greater than the preset axial displacement change threshold value, it is determined that the change in the axial displacement will obviously cause a displacement change between the lifting shaft (8) and the screw rod (5), so that the rotation of the screw rod (5) causes inaccurate displacement of the lifting shaft (8), resulting in inaccurate adjustment of the hydraulic tail plate, generating a replacement warning signal, and transmitting the replacement warning signal to the warning module.

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