Feeding machine capable of correcting deviation for steel structure machining

Abstract

The utility model relates to the technical field of steel structure machining equipment, in particular to a steel structure machining feeding machine capable of rectifying deviation, which comprises a base, a conveying mechanism and a deviation rectifying assembly. The conveying mechanism is arranged above the base and used for conveying materials to be machined. The deviation rectifying assembly is connected with the adjusting plate through a sliding support and used for adjusting the material position. Alignment deviation caused by vibration or material bending can be corrected, the machining precision and stability are improved, meanwhile, through the design of the damping pad, material damage is avoided, the vibration resistance is enhanced, and the device adapts to the complex working environment.

Description

Technical Field

[0001] This utility model belongs to the technical field of steel structure processing equipment, specifically a feeding machine for steel structure processing that can perform deviation correction. Background Technology

[0002] In steel structure fabrication, feeding machines are commonly used to deliver materials to the processing equipment. A search revealed a steel structure welding processing device with publication number CN116690052B, published on October 13, 2023. This design employs a side plate feeding mechanism and a horizontal plate feeding mechanism, achieving simultaneous feeding of the same type of vertical plate material from both sides, and ensuring the overall steel structure is aligned after feeding without repeated adjustments. However, this design relies heavily on the precise installation of the mechanical structure to guarantee alignment, lacking the ability to actively correct deviations caused by external factors (such as vibration, material bending, etc.), which may affect processing quality and efficiency.

[0003] Therefore, there is an urgent need to design a feeding machine for steel structure processing that can correct deviations, solve the above-mentioned problems caused by external factors, and improve the stability and accuracy of the processing. Utility Model Content

[0004] To address the alignment deviation of the loading machine during steel structure processing caused by external factors such as vibration and material bending, as mentioned in the background art, a steel structure loading machine capable of correction is provided. This device, through the addition of an active correction mechanism and optimized structural design, solves the technical problem of insufficient adaptability to external interference in existing technologies, while simultaneously improving the stability and accuracy of the processing.

[0005] To achieve the above objectives, the specific technical solution of this utility model for a steel structure processing feeder capable of correction is as follows:

[0006] A steel structure processing feeder capable of correction includes a base, a conveying mechanism, and a correction component. The conveying mechanism is located above the base and is used to carry and transport the material to be processed. The correction component is used to adjust the position of the material to be processed.

[0007] Furthermore, the conveying mechanism includes a first conveying unit and a second conveying unit, which are respectively disposed on both sides of the base, with a gap between them. Both the first and second conveying units include a roller assembly, a drive motor, a chain, and a synchronous belt. The roller assembly consists of multiple parallel rollers. The drive motor is connected to a drive wheel on one side of the roller assembly via a chain to drive the rollers to rotate. Synchronous belts are fitted on both sides of the parallel rollers, and the rollers rotate through mutual transmission via the synchronous belts. A tensioning wheel is provided at the bottom of the synchronous belt to adjust the tension, ensuring that the roller assemblies of the first and second conveying units operate synchronously.

[0008] Furthermore, the correction assembly includes a sliding bracket, a push rod, and an adjusting plate. The sliding bracket is positioned above the base and connected to the base via a slide rail. One end of the push rod is hinged to the sliding bracket, and the other end is hinged to the adjusting plate. The hinge blocks allow the push rod and adjusting plate to rotate only to a certain extent. A torsion spring is also provided at the hinge point, allowing the correction to be completed and then reset via the torsion spring. The adjusting plate is located in the gap between the first and second conveying units, and a rubber pad is provided on the top of the adjusting plate to reduce damage to the surface of the material to be processed.

[0009] Furthermore, a rack is provided at the bottom of the sliding bracket, which meshes with a gear. The gear is connected to a servo motor via a rotating shaft. The servo motor is fixed to the base and drives the sliding bracket to move along the slide rail by controlling the rotation of the gear, thereby adjusting the position of the adjustment plate.

[0010] Furthermore, the slide rail is provided with a guide groove, which cooperates with the slider at the bottom of the sliding bracket. The slider is embedded and slides in the guide groove to ensure the stability of the sliding bracket during movement. The inner wall of the guide groove is coated with a low-friction coating to reduce sliding resistance.

[0011] Furthermore, the bottom of the base is equipped with shock-absorbing pads, which are made of multiple layers of elastic material to absorb the impact of external vibrations on the device. The thickness of the shock-absorbing pads is adjusted according to the working environment of the device to meet different vibration reduction requirements.

[0012] Furthermore, the first and second conveying units are also equipped with auxiliary correction plates, which are equipped with multiple sets of auxiliary rollers.

[0013] Furthermore, the push rod is a telescopic structure, including an outer tube, an inner rod, and a locking bolt. The outer tube has a locking threaded hole at the hinge point away from the sliding bracket. The inner rod has multiple sets of threaded holes along the axis. The inner rod is nested inside the outer tube and fixed by the locking bolt and the threaded holes. The length of the push rod can be adjusted according to the size of the material to be processed to meet the processing requirements of different specifications.

[0014] The steel structure processing feeding machine of this utility model, which can perform deviation correction, has the following advantages:

[0015] By controlling the operation of the servo motor, the sliding bracket is driven to move the adjusting plate, thereby achieving active correction of the material to be processed. This design effectively solves the alignment deviation problem caused by external factors such as vibration and material bending, improving the stability and accuracy of the processing. The shock-absorbing pads at the bottom of the base further enhance the device's vibration resistance, ensuring its reliability in complex working environments. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the overall structure of a steel structure processing feeder capable of correction according to the present invention.

[0017] Figure 2 This is a partial structural diagram of the first conveying unit of a steel structure processing feeder capable of correction according to the present invention.

[0018] Figure 3 This is a partial structural diagram of the correction component of a steel structure processing feeder capable of correction according to the present invention.

[0019] Figure 4 This is a schematic diagram of the bottom gear and rack of the correction component of a steel structure processing feeder capable of correction according to the present invention;

[0020] Figure 5 This is a schematic diagram showing the disassembly of the push rod of a steel structure processing feeder capable of correction according to the present invention.

[0021] In the picture:

[0022] 1. Base; 11. Slide rail; 2. First conveying unit; 3. Second conveying unit; 4. Roller assembly; 5. Drive motor; 51. Chain; 6. Synchronous belt; 7. Sliding bracket; 71. Slider; 8. Push rod; 81. Outer cylinder; 82. Inner rod; 83. Locking bolt; 9. Adjusting plate; 10. Auxiliary correction plate; 101. Auxiliary roller; 12. Servo motor; 121. Gear; 122. Rack; 13. Guide groove; 14. Shock-absorbing pad. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The utility model will be further described in detail below with reference to the accompanying drawings.

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] The specific implementation of the steel structure processing feeding machine capable of correction according to this utility model is as follows, in conjunction with the appendix. Figure 1 To be continued Figure 5 Please provide a detailed explanation.

[0027] A conveying mechanism is provided above the base 1. The conveying mechanism includes a first conveying unit 2 and a second conveying unit 3, which are located on both sides of the base 1 with a gap between them. The function of the conveying mechanism is to carry and transport the material to be processed, while the correction component is located in the gap between the first conveying unit 2 and the second conveying unit 3. Example

[0028] In this embodiment, both the first conveying unit 2 and the second conveying unit 3 include a roller assembly 4, a chain 51, a synchronous belt 6, and a drive motor 5. The roller assembly 4 consists of multiple parallel rollers. The drive motor 5 is connected to a drive wheel on one side of the roller assembly 4 via the chain 51 to drive the rollers to rotate. Synchronous belts 6 are fitted on both sides of the parallel rollers, and the rollers rotate through mutual transmission via the synchronous belts 6. A tension wheel is provided at the bottom of the synchronous belts 6 to adjust the tension, ensuring that the roller assemblies 4 of the first conveying unit 2 and the second conveying unit 3 can operate synchronously. The synchronous belts 6 effectively avoid material transmission deviation caused by asynchrony of the roller assemblies 4, thus providing stable initial conditions for subsequent correction operations. When conveying the material to be processed, the user places the material on the first conveying unit 2 and starts the drive motor 5. The output end of the drive motor 5 drives one side of the rollers to rotate via the chain 51, and the rollers rotate through mutual transmission via the synchronous belts 6, moving the material to be processed. Example

[0029] In this embodiment, the correction assembly includes a sliding bracket 7, a push rod 8, and an adjusting plate 9. The sliding bracket 7 is connected to the base 1 via a slide rail 11. A slider 71 is provided at the bottom of the sliding bracket 7, and the slider 71 is embedded in and slides within a guide groove 13 formed in the slide rail 11. The inner wall of the guide groove 13 is coated with a low-friction coating to reduce sliding resistance, thereby ensuring the stability of the sliding bracket 7 during movement. A rack 122 is provided on the sliding bracket 7, and the rack 122 meshes with a gear 121. The gear 121 is connected to a servo motor 12 via a rotating shaft. The servo motor 12 is fixed to the base 1, and by controlling the rotation of the gear 121, it drives the sliding bracket 7 to move along the slide rail 11, thereby adjusting the position of the adjusting plate 9.

[0030] It should be noted that the correction component detects the offset position of the material to be processed through a laser rangefinder (not shown in the figure). The laser rangefinder transmits the position information to the controller (not shown in the figure) and calculates the distance of the adjustment plate 9 based on the offset, thereby controlling the servo motor 12 to adjust the position of the adjustment plate 9. When the laser rangefinder detects an offset in the position of the material to be processed, it transmits the position offset information to the controller. The controller calculates the distance to be adjusted based on the offset and then controls the servo motor 12. The output of the servo motor 12 then drives the gear 121 to rotate. The gear 121 meshes with the rack 122 and slides forward. The sliding bracket 7 on the rack 122 slides in the guide groove 13 inside the slide rail 11 through the sliders 71 on both sides. Example

[0031] One end of the push rod 8 is hinged to the sliding bracket 7, and the other end is hinged to the adjusting plate 9. The hinge blocks allow the push rod and adjusting plate to rotate only to a certain extent. A torsion spring is also provided at the hinge point, allowing the rod to be reset after correction. The adjusting plate 9 is located in the gap between the first conveying unit 2 and the second conveying unit 3, and its end is provided with a rubber pad to reduce damage to the surface of the material to be processed. The first conveying unit 2 and the second conveying unit 3 are also equipped with auxiliary correction plates 10, which have multiple sets of auxiliary rollers 101.

[0032] It should be noted that a pressure sensor (not shown in the figure) is installed at the bottom of the adjusting plate 9. The pressure sensor is electrically connected to the controller and is used to monitor the pressure applied by the adjusting plate 9 to the material to be processed. When the pressure exceeds the preset value, the controller issues an alarm signal and stops the servo motor 12 to avoid damage to the material. When the sliding bracket 7 drives the push rod 8 to move towards the material to be processed for correction, the rubber pad at the end of the adjusting plate 9 contacts the material to be processed, and the adjusting plate 9 and the auxiliary correction plate 10 form a clamping force to correct the material to be processed. During this period, the auxiliary roller 101 contacts the side of the material to be processed to reduce friction. The hinge between the adjusting plate 9 and the push rod 8 and the hinge between the push rod 8 and the sliding bracket 7 are adjusted at a certain angle to match the different widths of the surface of the material to be processed. When the pressure sensor at the bottom of the adjusting plate 9 detects that the pressure applied to the surface of the material to be processed is too high, the pressure sensor transmits information to the controller, and the controller stops the servo motor 12. When the correction is completed and the sliding bracket 7 slides back to its original position, the torsion springs at the hinge between the adjusting plate 9 and the push rod 8 and the hinge between the push rod 8 and the sliding bracket 7 restore the push rod 8 and the adjusting plate 9 to their original positions.

[0033] The push rod 8 adopts a telescopic structure, including an outer tube 81, an inner rod 82, and a locking bolt 83. The outer tube 81 has a locking threaded hole at the hinge point away from the sliding bracket 7. The inner rod 82 has multiple sets of threaded holes along the axis. The inner rod 82 is nested inside the outer tube 81 and is fixed by the locking bolt 83 cooperating with the threaded holes. The length of the push rod 8 can be adjusted according to the size of the material to be processed to meet the processing requirements of different specifications.

[0034] The bottom of the base 1 is equipped with a shock-absorbing pad 14, which is made of multiple layers of elastic material and is used to absorb the impact of external vibrations on the device. The thickness of the shock-absorbing pad 14 is adjusted according to the working environment of the device to meet different vibration reduction requirements. The installation of the shock-absorbing pad 14 can effectively reduce the interference of external vibrations on the entire device, thereby improving the reliability of the device in complex working environments.

[0035] In practical applications, the material to be processed is placed on the roller assembly 4 of the first conveying unit 2 and the second conveying unit 3. The drive motor 5 drives the roller assembly 4 to rotate via the chain 51, causing the material to move along the conveying direction. During the material movement, the laser rangefinder measures the distance between the material edge and the preset baseline in real time and sends the measurement data to the controller. The controller calculates the material offset based on the measurement data and generates corresponding control commands to send to the servo motor 12. The servo motor 12 drives the sliding bracket 7 to move along the slide rail 11 through the meshing of the gear 121 and the rack 122. The movement of the sliding bracket 7 drives the push rod 8 and the adjusting plate 9 to move synchronously. The adjusting plate 9 and the auxiliary correction plate 10 form a clamping force, thereby applying a lateral thrust to the material to correct its positional deviation. The rubber pad layer on the top of the adjusting plate 9 can reduce damage to the material surface, while the pressure sensor at the bottom monitors the pressure applied by the adjusting plate 9 in real time. When the pressure exceeds the preset value, the controller will issue an alarm signal and stop the servo motor 12 to prevent excessive correction from damaging the material.

[0036] To further improve the adaptability of the device, the length of the push rod 8 can be adjusted according to the width of the material to be processed. In specific operation, the length adjustment is completed by loosening the locking bolt 83 to adjust the position of the inner rod 82 inside the outer tube 81, and then retightening the locking bolt 83. In addition, the thickness of the shock-absorbing pad 14 can also be adjusted according to different working environments. For example, in environments with greater vibration, the thickness of the shock-absorbing pad 14 can be increased to enhance the shock absorption effect.

[0037] The connection and positional relationships of the components in the above embodiments have been optimized to ensure the overall stability and operational accuracy of the device. For example, the sliding bracket 7 is connected to the base 1 via the slide rail 11 and fixed by the slider 71 in the guide groove 13. This design effectively reduces the swaying of the sliding bracket 7 during movement, thereby improving the positional accuracy of the adjusting plate 9. At the same time, the low-friction coating on the inner wall of the guide groove 13 further reduces the sliding resistance, making the movement of the sliding bracket 7 smoother. The hinged design between the adjusting plate 9 and the push rod 8 allows the adjusting plate 9 to swing freely within a certain range, thereby better adapting to uneven material surfaces.

[0038] During actual operation of the device, all components work together to achieve precise adjustment of the material's position. For example, when the laser rangefinder detects a material deviation, the controller immediately generates a control command and sends it to the servo motor 12. The servo motor 12 drives the sliding bracket 7 to move through the meshing of gear 121 and rack 122. The movement of the sliding bracket 7 is transmitted to the adjusting plate 9 through the push rod 8, and finally, the adjusting plate 9 applies a lateral thrust to the material to correct its positional deviation. Throughout the process, the pressure sensor monitors the pressure applied by the adjusting plate 9 in real time to ensure that the correction operation does not damage the material. At the same time, the shock-absorbing pad 14 absorbs external vibrations, ensuring the stable operation of the device.

[0039] To enable those skilled in the art to fully understand and implement this utility model, the following supplementary explanation of the specific implementation principle of this utility model is provided in conjunction with a specific application scenario.

[0040] In steel structure fabrication, the materials to be processed are typically long strips of steel plates or profiles. These materials need to be conveyed and aligned by a loading machine before entering the processing equipment. However, due to external vibrations, material bending, or other factors, the materials may shift laterally during conveying, leading to a decrease in subsequent processing accuracy. To solve this problem, this invention provides a steel structure fabrication loading machine capable of correction, and its operating principle is explained in detail in conjunction with specific application scenarios.

[0041] First, in the initial state, the material to be processed is placed on the roller assembly 4 of the first conveying unit 2 and the second conveying unit 3. The drive motor 5 drives the roller assembly 4 to rotate via the chain 51, thereby causing the material to move smoothly along the conveying direction. During this process, the synchronous belt 6 wraps around both ends of the roller assembly 4 and its tension is adjusted by the tension wheel to ensure that the roller assembly 4 of the first conveying unit 2 and the second conveying unit 3 operate synchronously. This design effectively avoids material transmission deviation caused by roller asynchrony and provides stable initial conditions for subsequent correction operations.

[0042] Next, after the material enters the conveying mechanism, a laser rangefinder measures the distance between the edge of the material to be processed and the preset baseline in real time. The laser rangefinder sends the measurement data to the controller, which calculates the lateral offset of the material based on the received data. If the material offset is detected, the controller immediately generates a control command and sends it to the servo motor 12. The servo motor 12 drives the sliding bracket 7 to move along the slide rail 11 through the meshing of the gear 121 and the rack 122. The movement of the sliding bracket 7 is further transmitted to the adjusting plate 9 through the push rod 8. The adjusting plate 9 is located in the gap between the first conveying unit 2 and the second conveying unit 3, and its top is provided with a rubber pad to reduce surface damage when in contact with the material. The adjusting plate 9 corrects the positional deviation of the material by applying a lateral thrust, so that it is realigned to the preset baseline.

[0043] During the web alignment process, a pressure sensor monitors the pressure applied to the material by the regulating plate 9 in real time. When the pressure exceeds the preset value, the controller issues an alarm signal and stops the servo motor 12 to prevent over-alignment from damaging the material. This design not only improves the safety of the web alignment operation but also ensures that the surface quality of the material is not affected.

[0044] Furthermore, to accommodate materials of different specifications, the push rod 8 employs a telescopic structure. In operation, the length is adjusted by loosening the locking bolt 83 to adjust the position of the inner rod 82 within the outer tube 81, and then retightening the locking bolt 83. This design allows the device to flexibly handle materials of varying widths, enhancing its versatility and applicability. Simultaneously, the shock-absorbing pad 14 at the bottom of the base 1 is composed of multiple layers of elastic material, effectively absorbing the impact of external vibrations on the device. In high-vibration working environments, the thickness of the shock-absorbing pad 14 can be increased to enhance the damping effect, thereby improving the reliability of the device in complex environments.

[0045] Throughout the operation, all components work together to achieve precise correction. For example, when the laser rangefinder detects a material deviation, the controller quickly generates a control command and sends it to the servo motor 12. The servo motor 12 drives the sliding bracket 7 to move along the guide groove 13 through the meshing of gear 121 and rack 122. The movement of the sliding bracket 7 is transmitted to the adjusting plate 9 via the push rod 8, and finally the adjusting plate 9 applies a lateral thrust to the material to correct its positional deviation. The inner wall of the guide groove 13 is coated with a low-friction coating, which further reduces sliding resistance and makes the movement of the sliding bracket 7 smoother. The hinged design of the adjusting plate 9 and the push rod 8 allows the adjusting plate 9 to swing freely within a certain range, thereby better adapting to the unevenness of the material surface.

[0046] In summary, this utility model's steel structure processing feeder with alignment correction capability solves the technical problem of insufficient adaptability to external interference in existing technologies by adding an active alignment correction mechanism and optimizing the structural design. In practical applications, the device can monitor the positional deviation of the material to be processed in real time and precisely adjust it by driving the adjustment plate 9 through the servo motor 12, thereby ensuring the alignment accuracy of the material during the conveying process. At the same time, the pressure sensor effectively avoids material damage caused by excessive alignment correction, while the shock-absorbing pad 14 further enhances the device's vibration resistance, ensuring its stable operation in complex working environments.

[0047] The existing technical markings: laser rangefinder, controller, pressure sensor, drive motor 5 and servo motor 12 are common knowledge in the field. They are used without modification, so the control method and circuit connection will not be described in detail.

[0048] It should be noted that all electrical components mentioned in this article are connected to an external main controller and 220V AC mains power. The main controller can be a conventional known device that can be controlled by a computer or other means. The detailed description of known functions and known components is omitted in the specific implementation of this disclosure. In order to ensure the compatibility of the device, the operating methods used are consistent with the parameters of commercially available instruments.

[0049] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A steel structure processing feeding machine capable of rectifying deviation, characterized in that, It includes a base (1), a conveying mechanism and a correction component. The conveying mechanism is located above the base (1) and is used to carry and transport the material to be processed. The correction component is used to adjust the position of the material to be processed.

2. The steel structure processing feeding machine according to claim 1, characterized in that, The conveying mechanism includes a first conveying unit (2) and a second conveying unit (3). The first conveying unit (2) and the second conveying unit (3) are respectively arranged on both sides of the base (1) and there is a gap between them. The first conveying unit (2) and the second conveying unit (3) each include a roller group (4), a drive motor (5), a chain (51) and a synchronous belt (6). The roller group (4) is composed of multiple parallel rollers. The drive motor (5) is connected to the drive wheel on one side of the roller group (4) through the chain (51) to drive the rollers to rotate. The parallel rollers are fitted with synchronous belts (6) on both sides. The rollers rotate with each other through the synchronous belts (6). The bottom of the synchronous belts (6) is provided with tensioning wheels to adjust the tightness.

3. The steel structure processing feeding machine according to claim 2, characterized in that, The correction assembly includes a sliding bracket (7), a push rod (8), and an adjusting plate (9). The sliding bracket (7) is connected to the base (1) via a slide rail (11). One end of the push rod (8) is hinged to the sliding bracket (7) and the other end is hinged to the adjusting plate (9). The adjusting plate (9) is located in the gap between the first conveying unit (2) and the second conveying unit (3). The end of the adjusting plate (9) is provided with a rubber pad.

4. The steel structure processing feeder according to claim 3, characterized in that, The bottom of the sliding bracket (7) is provided with a rack (122), which meshes with a gear (121). The gear (121) is connected to the servo motor (12) through a rotating shaft. The servo motor (12) is fixed on the base (1) and drives the sliding bracket (7) to move along the slide rail (11) by rotating the gear (121) to adjust the position of the adjustment plate (9).

5. The steel structure processing feeding machine according to claim 3, characterized in that, The slide rail (11) is provided with a guide groove (13), which cooperates with the slider (71) at the bottom of the sliding bracket (7). The slider (71) is embedded and slides in the guide groove (13), and the inner wall of the guide groove (13) is coated with a low-friction coating.

6. The steel structure processing feeding machine according to claim 1, characterized in that, The bottom of the base (1) is provided with a shock-absorbing pad (14), which is made of multiple layers of elastic material. The thickness of the shock-absorbing pad (14) is adjusted according to the working environment of the device.

7. The steel structure processing feeding machine according to claim 2, characterized in that, The first conveying unit (2) and the second conveying unit (3) are also provided with an auxiliary correction plate (10), and the auxiliary correction plate (10) is provided with multiple sets of auxiliary rollers (101).

8. The steel structure processing feeding machine according to claim 3, characterized in that, The push rod (8) includes an outer cylinder (81), an inner rod (82) and a locking bolt (83). The outer cylinder (81) has a locking threaded hole at the hinge point away from the sliding bracket (7), and the inner rod (82) has multiple sets of threaded holes along the axis.

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