An electric cylinder for a hydraulic tail lift

Abstract

The present invention discloses an electric cylinder for a hydraulic tailboard, which relates to the technical field of electric cylinders and includes a tube body; through the cooperation of the outer shell and the U-shaped seat, the hinge seat is convenient to install and disassemble quickly, improving the maintenance efficiency; through the cooperation of the limit ring and the lead screw, the stable lifting of the jacking shaft is facilitated, improving the stability of the tailboard; through the real-time monitoring and analysis of the operating data of the servo motor, the friction loss and the axial displacement change between the lead screw and the jacking shaft are accurately calculated, and it is automatically judged whether the rotational speed or torque needs to be adjusted, so as to realize the precise control of the lifting action of the hydraulic tailboard, ensure that the tailboard can operate stably and accurately under different working conditions, improve the efficiency and safety of cargo loading and unloading, and avoid the rapid wear of the lead screw and the jacking shaft due to excessive friction, extend the overall service life of the electric cylinder, reduce the equipment replacement frequency, and reduce the equipment maintenance cost.

Description

Technical Field

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

[0002] The main functions of electric cylinders are reflected in multiple aspects. In industrial automation production, such as the assembly line of electronic products, electric cylinders can accurately control the positions of robotic arms, fixtures and other components according to preset programs, achieve high-precision assembly of components, and ensure the stability of product quality; in the field of numerical control machine tools, it can accurately adjust the position of the cutting tool to ensure the machining accuracy; in the logistics and warehousing industry, electric cylinders can drive the cargo platform to perform actions such as lifting and translation, facilitate the stacking and handling of goods, bear the corresponding cargo weight, and contribute to efficient logistics operation; for example, the shelf handling equipment in a three-dimensional warehouse often relies on electric cylinders to drive the shelves to move to meet the needs of cargo storage and retrieval;

[0003] For the electric cylinder used for a hydraulic tailgate, it needs to bear heavy goods for a long time and many times, which may cause the connection between the electric cylinder and the vehicle to break. When the connection of 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;

[0004] In the prior art, traditional electric cylinders lack effective monitoring and intelligent control means for the internal operating state during operation, and cannot timely understand the friction situation between the lead screw and the lifting shaft, as well as the impact of the wear caused by the friction on the equipment performance; when the friction loss increases or the axial displacement change caused by wear exceeds the reasonable range, it is easy to cause inaccurate lifting of the lifting shaft, affecting the normal operation of the hydraulic tailgate; and when problems occur in the equipment, it is often necessary to manually check the cause of the failure, which is not only inefficient, but also may increase the maintenance cost and delay the loading and unloading of goods due to the inability to discover problems in time;

[0005] Therefore, it is necessary to make improvements according to the above problems. Summary of the Invention

[0006] The purpose of the present invention is to solve the deficiencies existing in the prior art, and to propose an electric cylinder used for a hydraulic tailgate.

[0007] To achieve the above purpose, the present invention adopts the following technical solution: An electric cylinder used for a hydraulic tailgate, including a tube body, a tube sleeve is fixedly connected to the top surface of the tube body, a guiding opening is provided on the top surface of the tube sleeve, and a copper tube is fixedly connected inside the guiding opening on the top surface of the tube sleeve, and a housing is fixedly connected to the bottom surface of the tube body, and a servo motor is arranged inside the housing, and the servo motor is installed on the bottom surface of the tube body;

[0008] A servo motor controller is provided on the outer wall of the servo motor. Inside the servo motor controller, there are a collection module, an analysis module, and a warning module;

[0009] The collection module detects the rotational speed, torque, and running time data of the servo motor, and transmits the detected rotational speed, torque, and running time data to the analysis module;

[0010] The analysis module processes and analyzes the rotational speed and torque data of the servo motor, calculates the friction loss amount and axial displacement change between the lead screw and the lifting shaft. When the friction loss amount exceeds the loss amount threshold, it generates an adjustment signal and transmits the adjustment signal to the warning module. When the axial displacement change amount exceeds the displacement threshold, it generates a replacement warning signal and transmits the replacement warning signal to the warning module;

[0011] The warning module receives the adjustment signal and adjusts the rotational 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 lead screw and the lifting shaft.

[0012] Preferably, a lead screw is vertically provided inside the tube body. The lower end of the lead screw is fixedly connected with a bearing, and 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, and the lead screw is threadedly connected with 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.

[0013] Preferably, the output shaft of the servo motor penetrates the tube body, and the output shaft of the servo motor is connected to the lead screw through a coupling.

[0014] Preferably, a plurality of equally spaced limiting grooves are vertically provided 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 slidably placed in the limiting groove, and the limiting ring is installed at the lower end of the lifting shaft.

[0015] Preferably, T-shaped grooves are provided on both sides of the bottom surface of the outer shell, and a second thread groove is provided in the middle of the bottom surface of the outer shell.

[0016] Preferably, a U-shaped seat is provided at the lower end of the outer shell. T-shaped blocks are fixedly connected to both ends of the U-shaped seat. The T-shaped blocks are placed in the T-shaped grooves. A guiding port is provided in the middle of the U-shaped seat. A positioning screw is provided in the guiding port. The upper end of the positioning screw is threadedly connected to the outer shell. A positioning nut is provided between the outer shell and the U-shaped seat. The positioning nut is threadedly connected to the positioning screw, and a hinge seat is fixedly connected to the bottom surface of the positioning screw.

[0017] Preferably, the steps for the analysis module to analyze the rotational speed and torque data are as follows:

[0018] Step 1: Retrieve the historical rotational speed data of the servo motor, preset the rotational speed fluctuation gap, calculate the mean value of the historical rotational speed data, use the rotational speed mean value as the base rotational speed, divide the historical rotational speed data according to the size of the rotational speed fluctuation gap, count the number of detected rotational speed data in each divided segment after division. If the number of detected rotational speed data in the non-base rotational speed divided segment is less than the product of the preset ratio and the number of detected rotational speed data in the base rotational speed divided segment, it is determined that the rotational speed data in the non-base rotational speed divided segment has a small influence on the judgment of the detected rotational speed data, and use the detected rotational speed data in the base rotational speed divided segment as the detected rotational speed data ; Perform the same processing on the torque and running time data to obtain the detected torque data and the detected running time data ;

[0019] Step 2: Under steady-state conditions, the relationship between the axial force borne by the lead screw and the motor output torque is , is the pitch of the lead screw; the relative sliding speed between the lead screw and the lifting shaft, the frictional loss power between the lead screw and the lifting shaft, is the friction coefficient, then within the detected running time data , the total frictional loss energy . If during operation, the detected rotational speed data and the detected torque data are stable, the total frictional loss energy can be simplified to ;

[0020] Step 3: When it is detected that the frictional loss power is greater than the preset frictional loss power threshold, it is determined that continued rotation will cause a large frictional loss between the lifting shaft and the lead screw, generate an adjustment signal, and transmit the adjustment signal to the warning module

[0021] Preferably, the judgment steps of the analysis module for rotational speed and torque adjustment are as follows

[0022] Step 1: After determining that it will cause a large frictional loss, then analyze the relationship between the frictional loss power and rotational speed and torque, stabilize the torque, reduce the rotational speed according to the set ratio, and calculate the change amount of the frictional loss power after each adjustment , is the number of rotational speed adjustment times; calculate the mean value of the change amount of the frictional loss power after each adjustment, and then the change amount Calculate the difference from the average value of the change in frictional loss power after each adjustment, and select the rotational speed data corresponding to the group of data with the smallest difference, which is marked as the optimal rotational speed data;

[0023] Step 2: Stabilize the torque, reduce the torque according to a set ratio, and calculate the change in frictional loss power , is the number of torque adjustment times, and obtain the optimal torque data; Compare the rotational speed data and torque data corresponding to the calculated frictional loss power data with the optimal rotational speed data and optimal torque data, and calculate the differences respectively. If the absolute value of the difference between the rotational speed data and the optimal rotational speed data is greater than the absolute value of the difference between the torque data and the optimal torque data, adjust the rotational speed; otherwise, adjust the torque.

[0024] Preferably, the judgment steps of the analysis module for the change in axial displacement are as follows:

[0025] Step 1: The total frictional loss energy , material hardness and the wear amount The relationship between them is , is the wear coefficient; the radial wear depth caused by wear , is the diameter of the lead screw, is the contact length between the jacking shaft and the lead screw; due to the change in the clearance fit between the lead screw and the jacking shaft and the change in the surface state after wear, the jacking shaft undergoes an axial displacement change relative to the lead screw, and the axial displacement change , is the preset correction coefficient, is the pitch of the lead screw;

[0026] 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 axial displacement will significantly cause a displacement change between the jacking shaft and the lead screw, making the rotation of the lead screw inaccurate for the displacement of the jacking shaft, resulting in inaccurate adjustment of the hydraulic tailgate, generate a replacement warning signal, and transmit the replacement warning signal to the warning module.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. The cooperation between the outer shell and the U-shaped seat facilitates the quick installation and disassembly of the hinge seat, thus improving the maintenance efficiency. The cooperation between the outer shell and the positioning screw facilitates the installation of the hinge seat, thus enhancing the convenience of the hinge seat installation. The cooperation between the positioning screw and the positioning nut facilitates the connection between the U-shaped seat and the hinge seat, improving the stability of the hinge seat and the connection effect of the hinge seat. The cooperation between the limit ring and the lead screw facilitates the stable lifting and lowering of the lifting shaft, improving the stability of the tailboard. The cooperation between the pipe sleeve and the shaft sleeve facilitates the maintenance of the electric cylinder, improving the maintenance efficiency;

[0029] 2. By real-time monitoring and analysis of the operating data of the servo motor, accurately calculate the friction loss and axial displacement change between the lead screw and the lifting shaft, automatically judge whether it is necessary to adjust the rotational speed or torque, so as to achieve precise control of the lifting action of the hydraulic tailboard, ensure that the tailboard can operate stably and accurately under different working conditions, improve the efficiency and safety of cargo handling, and avoid the rapid wear of the lead screw and the lifting shaft due to excessive friction, extend the overall service life of the electric cylinder, reduce the equipment replacement frequency, and reduce the equipment maintenance cost;

[0030] 3. Through the preset friction loss power threshold and axial displacement change threshold, the system can issue an early warning before serious problems occur in the equipment, avoid production interruption caused by equipment failures, improve the reliability and stability of equipment operation, and reduce economic losses caused by sudden equipment failures; The whole process does not require continuous manual monitoring and frequent intervention. The system automatically completes data collection, analysis, judgment and adjustment operations, reducing the complexity and error of manual operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings described herein are used to provide a further understanding of the present invention and form a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0032] Figure 1 is a schematic three-dimensional structure diagram of the whole proposed by the present invention;

[0033] Figure 2 is a schematic three-dimensional sectional structure diagram of the whole proposed by the present invention;

[0034] Figure 3 is a schematic three-dimensional structure diagram of the lifting shaft and the limit ring proposed by the present invention;

[0035] Figure 4 is proposed by the present invention Figure 2 is an enlarged schematic diagram of the structure of part A in;

[0036] Figure 5 is proposed by the present invention Figure 2 is an enlarged schematic diagram of the structure of part B in;

[0037] Figure 6 This is the system flow chart of the present invention.

[0038] Reference numerals in the figure: 1, pipe body; 2, pipe sleeve; 3, outer shell; 4, copper pipe; 5, lead screw; 6, bearing; 7, servo motor; 8, jacking shaft; 9, shaft sleeve; 10, connecting screw; 11, limit groove; 12, limit ring; 13, U-shaped seat; 14, positioning screw; 15, hinge seat; 16, positioning nut. Specific embodiments

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0040] Embodiment: Refer to Figures 1-6 , an electric cylinder used in a hydraulic tailboard in the present invention includes a pipe body 1. A pipe sleeve 2 is fixedly connected to the top surface of the pipe body 1. A guide opening is provided on the top surface of the pipe sleeve 2, and a copper pipe 4 is fixedly connected in the guide opening on the top surface of the pipe sleeve 2. An outer shell 3 is fixedly connected to the bottom surface of the pipe body 1. A servo motor 7 is provided inside the outer shell 3, and the servo motor 7 is installed on the bottom surface of the pipe body 1; the pipe sleeve 2 and the outer shell 3 are conveniently installed through the pipe body 1; the copper pipe 4 is conveniently installed through the pipe sleeve 2; the jacking shaft 8 is conveniently led out through the copper pipe 4; the rotation of the lead screw 5 is conveniently controlled through the servo motor 7. A lead screw 5 is vertically provided inside the pipe body 1. A bearing 6 is fixedly connected to the lower end of the lead screw 5, and the bearing 6 is installed on the inner bottom surface of the pipe body 1. A jacking shaft 8 is vertically provided inside the pipe body 1. A first thread groove is provided on the bottom surface of the jacking shaft 8, and the lead screw 5 is threadedly connected to the jacking shaft 8. A shaft sleeve 9 is fixedly connected to the top surface of the jacking shaft 8, and a connecting screw 10 is fixedly connected to the middle of the top surface of the shaft sleeve 9; the lifting of the jacking shaft 8 is conveniently controlled through the lead screw 5; the rotation of the lead screw 5 is conveniently achieved through the bearing 6; the connecting screw 10 is conveniently installed through the shaft sleeve 9; the connection of the jacking shaft 8 is conveniently achieved through the connecting screw 10. The output shaft of the servo motor 7 penetrates the pipe body 1, and the output shaft of the servo motor 7 is connected to the lead screw 5 through a coupling.

[0041] In the present invention, a plurality of equally spaced limiting grooves 11 are vertically formed in the inner wall of the pipe body 1, and a limiting ring 12 is horizontally arranged inside the pipe body 1. The outer side of the limiting ring 12 is placed in the limiting groove 11 and slides therein, and the limiting ring 12 is installed at the lower end of the jacking shaft 8. The lifting guide of the jacking shaft 8 is facilitated by the limiting groove 11 and the limiting ring 12. T-shaped grooves are formed on both sides of the bottom surface of the outer shell 3, and a second threaded groove is formed in the middle of the bottom surface of the outer shell 3. A U-shaped seat 13 is provided at the lower end of the outer shell 3. 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. A guiding port is formed in the middle of the U-shaped seat 13. A positioning screw 14 is arranged in the guiding port. The upper end of the positioning screw 14 is threadedly connected to the outer shell 3. A positioning nut 16 is arranged 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 installation of the positioning screw 14 is facilitated by the U-shaped seat 13. The connection of the hinge seat 15 is facilitated by the positioning screw 14. The fixing of the positioning screw 14 is facilitated by the positioning nut 16. The installation of the pipe body 1 is facilitated by the hinge seat 15.

[0042] A servo motor controller is provided on the outer side wall of the servo motor 7, and an acquisition module, an analysis module and a warning module are arranged inside the servo motor controller.

[0043] During the operation of the servo motor 7, the lead screw 5 is driven to rotate to move the position of the jacking shaft 8. During the rotation of the lead screw 5, the speed, torque and running time data of the servo motor 7 are detected by the inductor.

[0044] Retrieve the historical speed data of the servo motor 7, preset the speed fluctuation gap, calculate the mean value of the historical speed data, take the speed mean value as the base speed, divide the historical speed data according to the size of the speed fluctuation gap, count the number of detected speed data in each divided segment after division. If the number of detected speed data in the non-base speed divided segment is less than the product of the preset ratio and the number of detected speed data in the base speed divided segment, it is determined that the speed data in the non-base speed divided segment has a small influence on the judgment of the detected speed data, and the detected speed data in the base speed divided segment is used as the detected speed data ; The same processing is performed on the torque and running time data to obtain the detected torque data and the detected running time data ;

[0045] Under steady-state conditions, the relationship between the axial force borne by the lead screw 5 and the motor output torque is , where is the pitch of the lead screw 5; the relative sliding speed between the lead screw 5 and the jacking shaft 8, and the frictional loss power is the friction coefficient, then within the detected operation time data the total frictional loss energy If during operation, the detected rotational speed data and the detected torque data are stable, the total frictional loss energy can be simplified to ;

[0046] When it is detected that the frictional loss power is greater than the preset frictional loss power threshold, it is determined that continued rotation will cause frictional loss between the jacking shaft 8 and the lead screw 5, a regulation signal is generated, and the regulation signal is transmitted to the warning module;

[0047] After determining that significant frictional loss will be caused, analyze the relationship between the frictional loss power and the rotational speed and torque, stabilize the torque, reduce the rotational speed according to a set ratio, and calculate the change in frictional loss power after each adjustment , is the number of rotational speed adjustments; calculate the average value of the change in frictional loss power after each adjustment Then, calculate the difference between the change in frictional loss power after each adjustment and the average value of the change in frictional loss power after each adjustment, and take the rotational speed data corresponding to the set of data with the smallest difference as the optimal rotational speed data; stabilize the torque, reduce the torque according to a set ratio, and calculate the change in frictional loss power , is the number of torque adjustments, and obtain the optimal torque data; compare the rotational speed data and torque data corresponding to the calculated frictional loss power data with the optimal rotational speed data and optimal torque data, and calculate the differences respectively. If the absolute value of the difference between the rotational speed data and the optimal rotational speed data is greater than the absolute value of the difference between the torque data and the optimal torque data, adjust the rotational speed; otherwise, adjust the torque;

[0048] The total frictional loss energy , the material hardness and the wear amount The relationship between them is , is the wear coefficient; the radial wear depth caused by wear , is the diameter of the lead screw 5, is the contact length between the jacking shaft 8 and the lead screw 5; due to the change in the clearance fit between the lead screw 5 and the jacking shaft 8 and the change in the surface state after wear, an axial displacement change occurs in the jacking shaft 8 relative to the lead screw 5, and the axial displacement change , is the preset correction coefficient, is the pitch of the lead screw 5;

[0049] Compare the calculated axial displacement change data with a 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 significantly cause a displacement change between the jacking shaft 8 and the lead screw 5, making the rotation of the lead screw 5 inaccurate for the displacement of the jacking shaft 8, resulting in inaccurate adjustment of the hydraulic tailgate, generating a replacement warning signal, and transmitting the replacement warning signal to the warning module.

[0050] Working principle: When the present invention is in use, first install the pipe body 1 at the rear end of the vehicle through the hinge seat 15, then connect it to the tailgate through the connecting screw 10, and then connect the wire of the servo motor 7 and power it on. When it is necessary to control the opening or closing of the tailgate, start the servo motor 7, control the rotation of the lead screw 5 through the servo motor 7, thread-connect the lead screw 5 with the jacking shaft 8, and then place the outer side of the limit ring 12 in the limit groove 11. When the lead screw 5 rotates, the lifting of the jacking shaft 8 is controlled, thereby controlling the opening or closing of the tailgate; when the gravity borne by the electric cylinder is too large and the hinge seat 15 breaks, only need to rotate the positioning nut 16 to make the positioning nut 16 away from the U-shaped seat 13, then rotate the hinge seat 15, thereby rotating the positioning screw 14, and further separating the positioning screw 14 from the housing 3, then remove the U-shaped seat 13 from the T-slot, and then reinstall the new U-shaped seat 13 and hinge seat 15 on the housing 3.

[0051] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and 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, and a copper tube (4) is fixedly connected to 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 installed on the bottom surface of the tube body (1), a screw rod (5) is vertically provided inside the tube body (1), and a lifting shaft (8) is vertically provided inside the tube body (1), and the screw rod (5) is threadedly connected to the lifting shaft (8); 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 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; 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 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 first thread groove is provided on the bottom surface of the lifting shaft (8), and a shaft sleeve (9) is fixedly connected to the top surface of the lifting shaft (8). 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 greater 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.

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