Anti-seismic support anti-bending force testing device
By introducing protective and adjustment components into the seismic bracing bending force testing device, the problems of inaccurate crack recording and safety hazards during steel bending were solved, achieving accurate testing and safety protection of steel bending force.
Patent Information
- Application Number
- CN202511720957.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-21
- Publication Date
- 2026-02-06
AI Technical Summary
Existing seismic bracing bending force testing devices cannot accurately record cracks at the bending points of steel profiles, leading to inaccurate placement of the steel profiles, affecting test results, and posing safety hazards.
A test device for the bending force of a seismic brace, comprising a protective component and an adjustment component, was designed. The protective component is used to record the bending process of the steel section and protect the camera. The adjustment component is used to ensure that the steel section is aligned and positioned with the bending head to prevent debris from damaging the camera. The adjustment component is also used to automatically stop clamping to avoid friction affecting the test accuracy.
It enables precise recording and safety protection of the steel bending process, ensuring the accuracy of test data, avoiding damage to the camera and injury to personnel from debris, and improving the reliability and safety of the test.
Smart Images
Figure CN121475918A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of bending force testing technology, and specifically relates to a device for testing the bending force of a seismic brace. Background Technology
[0002] Bending force testing is a crucial step in evaluating material processing properties and quality control, widely used in sheet metal, electroplated coatings, and electronic products. The bending force test primarily assesses a material's adhesion, durability, and formability during bending. Seismic bracing is used to provide reliable protection for building electromechanical facilities during earthquakes. Its main body is made of steel profiles with a strength of Q235B or higher. To ensure that the steel profiles of seismic bracing meet requirements, it is necessary to test the bending force of the new seismic bracing steel profiles when using new materials. However, existing testing devices cannot accurately record cracks at the bending point of the steel profiles during bending force testing. This results in staff not knowing the deformation of the cracks during bending and cannot assist staff in accurately aligning the steel profiles on the testing device. This makes placing the steel profiles on the testing device time-consuming, labor-intensive, and prone to deviation, affecting the bending force test results and hindering the testing of the steel profiles of seismic bracing. Therefore, designing a bending force testing device for seismic bracing is a problem that needs to be solved. Summary of the Invention
[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a test device for the bending force of seismic bracing.
[0004] To achieve the above objectives, the present invention provides a seismic bracing bending force testing device, comprising a device body, a device bracket fixedly installed on the top of the device body, a hydraulic cylinder fixedly installed on the top of the device bracket, a bending head fixedly connected to the inner rod end of the hydraulic cylinder, two supports arranged inside the device bracket, and support rollers rotatably connected inside the two supports, with structural steel provided on the top of the two support rollers. A protective component is provided to assist workers in recording the bending process of the steel profile. The protective component is connected to the hydraulic cylinder and the bending head. An adjustment component is used to assist workers in placing and aligning the steel profiles. The adjustment component is connected to the device bracket, support, and support roller.
[0005] In the above technical solution, the protective component further includes a collar sleeved on the outer wall of the inner rod of the hydraulic cylinder. A sleeve is fixedly connected to the outer wall of the collar. A first spring is provided inside the sleeve. A connecting rod is inserted into the first spring. The first spring abuts against the end of the connecting rod near the collar.
[0006] In the above technical solution, further, a protective shell is fixedly connected to the end of the connecting rod away from the collar, a protective plate is snapped into the side of the protective shell near the connecting rod, two clips are provided inside the protective shell, and an elastic piece is fixedly connected to one side of each of the two clips. The elastic piece abuts against the inside of the protective shell, and a camera is arranged between the two elastic pieces.
[0007] In the above technical solution, the adjusting component further includes multiple clamping plates slidably connected to the outer walls of the two support rollers. Each of the multiple clamping plates has an L-shaped connecting rod fixedly connected to its outer wall. The outer wall of the L-shaped connecting rod is slidably connected to a sleeve rod. The L-shaped connecting rod is connected to the L-shaped connecting rod of the clamping plate on the adjacent support roller through the sleeve rod.
[0008] In the above technical solution, the outer wall of the clamping plate is further fixedly connected with a kit, a slide rod is inserted inside the kit of one of the clamping plates on the support roller, and a bidirectional threaded rod is threadedly connected inside the kit of the other clamping plate on the support roller. The outer walls of the slide rod and the bidirectional threaded rod are fitted with limit blocks, and the limit blocks are fixedly connected to the outer wall of the support.
[0009] In the above technical solution, a slot is further provided on the inner wall of the limiting block sleeved on the outer wall of the bidirectional threaded rod. A first chamfer is provided at one end of the slot near the corresponding part. A straight groove and a spiral groove are provided inside the bidirectional threaded rod. The straight groove and the spiral groove are connected.
[0010] In the above technical solution, a slider is slidably connected inside the spiral groove, a connecting block is fixedly connected to the outer wall of the slider, and a second spring is fixedly connected to one side of the connecting block. The second spring is disposed inside the bidirectional threaded rod.
[0011] In the above technical solution, further, a grooved rod is fixedly connected to the side of the connecting block away from the second spring, and a second chamfer is opened at the end of the grooved rod away from the connecting block. The grooved rod is inserted into the inside of the groove hole, and a rotating wheel is fixedly connected to the end of the grooved rod away from the connecting block.
[0012] In the above technical solution, further, rotating parts are inserted into the outer walls of both supports, and fixed blocks are threadedly connected to the outer walls of both rotating parts. A sliding groove is provided inside the device bracket, and the two fixed blocks are slidably connected inside the sliding groove.
[0013] Compared with the prior art, the present invention has the following beneficial effects: By setting up protective components, it is convenient for staff to clamp and place the camera, and the clamping position of the camera can be adjusted so that when the bending head bends the steel, the camera can clearly record the bending process of the steel. At the same time, during the bending process of the bending head, the fragments of the steel that fly off from the bending point to both sides due to substandard materials will be blocked by the protective plates on the protective shell. The impact force of the fragments is buffered and eliminated by the protective plates, preventing the fragments from being ejected again and preventing the fragments from damaging the camera or causing injury to the staff. By incorporating adjustment components, operators can easily position the steel profile, aligning the bending head with the center of the profile to ensure that pressure is applied perpendicularly to the axial direction, guaranteeing uniform stress distribution across the cross-section and preventing premature failure due to localized stress concentration, which could affect the accuracy of test data. Furthermore, after positioning the steel profile, clamping can automatically stop, preventing friction between the profile and the clamping plate during subsequent bending, which could affect the accuracy of pressure testing. Additionally, when the steel profile reaches its bending limit and breaks, the clamping plate can prevent it from flying off. This allows operators to easily adjust the distance between the two supports according to the profile's dimensions to meet the bending test requirements. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the overall structure proposed in this invention; Figure 2 This is a cross-sectional view of the support structure proposed in this invention; Figure 3 This is a cross-sectional view of the protective component and the adjustment component proposed in this invention; Figure 4 The present invention proposes Figure 3 Enlarged view of the A-section structure; Figure 5 The present invention proposes Figure 3 Enlarged view of the structure of section B; Figure 6 This is a partial structural diagram of the protective component proposed in this invention; Figure 7 This is a partial structural diagram of the adjustment component proposed in this invention.
[0015] In the diagram: 1. Main body of the device; 2. Device support; 3. Hydraulic cylinder; 4. Bending head; 5. Support; 6. Support roller; 7. Structural steel; 8. Collar; 9. Sleeve; 10. First spring; 11. Connecting rod; 12. Protective shell; 13. Protective plate; 14. Clamping plate; 15. Elastic plate; 16. Camera; 17. Clamping plate; 18. L-shaped connecting rod; 19. Sleeve rod; 20. Kit; 21. Slide rod; 22. Bidirectional threaded rod; 23. Limiting block; 24. Slot; 25. First chamfer; 26. Straight groove; 27. Spiral groove; 28. Slider; 29. Connecting block; 30. Second spring; 31. Grooved rod; 32. Second chamfer; 33. Rotating wheel; 34. Rotating component; 35. Fixed block; 36. Slide groove. Detailed Implementation
[0016] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0017] like Figures 1 to 7 The device shown is a seismic bracing bending force testing device, comprising a main body 1, a device support 2 fixedly mounted on the top of the main body 1, a hydraulic cylinder 3 fixedly mounted on the top of the device support 2, a bending head 4 fixedly connected to the inner rod end of the hydraulic cylinder 3, two supports 5 arranged inside the device support 2, and support rollers 6 rotatably connected inside the two supports 5, with steel sections 7 arranged on the top of the two support rollers 6; a protective component, used to assist the operator in recording the bending process of the steel section 7, and the protective component is connected to the hydraulic cylinder 3 and the bending head 4; and an adjustment component, used to assist the operator in placing and aligning the steel section 7, and the adjustment component is connected to the device support 2, the supports 5 and the support rollers 6.
[0018] The protective assembly includes a collar 8 sleeved on the outer wall of the inner rod of the hydraulic cylinder 3. A sleeve 9 is fixedly connected to the outer wall of the collar 8. A first spring 10 is provided inside the sleeve 9. A connecting rod 11 is inserted into the first spring 10. The first spring 10 abuts against the end of the connecting rod 11 near the collar 8. A protective shell 12 is fixedly connected to the end of the connecting rod 11 away from the collar 8. A protective sheet 13 is snapped onto the side of the protective shell 12 near the connecting rod 11. The protective sheet 13 is made of transparent plastic. Two clips 14 are provided inside the protective shell 12. An elastic sheet 15 is fixedly connected to one side of each clip 14. The elastic sheet 15 abuts against the inside of the protective shell 12. A camera 16 is provided between the two elastic sheets 15. The protective component is used to place the camera 16 so that the camera 16 can be lowered together with the bending head 4 to record the entire process of the bending head 4 bending the steel 7. The protective component is used to protect the steel 7 during the bending process to prevent fragments from flying out to both sides during the bending process and causing injury to the camera 16 or the surrounding staff. Specifically, when the staff needs to install the camera 16, first pull the protective shell 12, causing the protective shell 12 to drive the connecting rod 11 to slide along the inside of the sleeve 9 and compress the first spring 10 to contract, so that the protective plate 13 on the protective shell 12 stops pressing against the side of the bending head 4. Then, remove the protective plate 13 from the inside of the protective shell 12 and place the camera 16 between the two clamping plates 14 inside the protective shell 12, so that the clamping plates 14 clamp and fix the camera 16 through the elastic plate 15. At this time, the staff can adjust the position of the camera 16 clamped and fixed between the two clamping plates 14 so that when the bending head 4 bends the steel 7, the camera 16 can be accurately aligned with the bending part of the steel 7 and clearly record the bending process of the steel 7. After clamping the camera 16 between the clamping plates 14, the protective plate 13 can be re-clamped inside the protective shell 12 (if the protective plate 13 is damaged, a new protective plate needs to be replaced). The protective shell 12 is stopped, and the first spring 10 pushes the protective shell 12 back to its original position through the connecting rod 11. The protective shell 12 then moves the protective plate 13 back to press against the side of the bending head 4. At this point, the camera 16 is in place. The operator can then activate the hydraulic cylinder 3 to lower the bending head 4 and bend the steel section 7. The hydraulic cylinder 3, through the collar 8, sleeve 9, and connecting rod 11, moves the protective shell 12 down together, allowing the camera 16 inside the protective shell 12 to follow the bending head 4 and descend synchronously. This allows for a comprehensive and clear recording of the bent section of the steel section 7. Simultaneously, during the bending process of the bending head 4, any fragments of the steel section 7 that fly off from the bent section due to substandard materials will be blocked by the protective plate 13 on the protective shell 12. This buffers and eliminates the impact force of the fragments, preventing secondary ejection and avoiding damage to the camera 16 or injury to the operator.
[0019] The adjusting assembly includes multiple clamping plates 17 slidably connected to the outer walls of two support rollers 6. Each clamping plate 17 has an L-shaped connecting rod 18 fixedly connected to its outer wall. A sleeve rod 19 is slidably connected to the outer wall of each L-shaped connecting rod 18. The L-shaped connecting rod 18 is connected to the L-shaped connecting rod 18 of the clamping plate 17 on the adjacent support roller 6 via the sleeve rod 19. A fitting 20 is fixedly connected to the outer wall of each clamping plate 17. A sliding rod 21 is inserted into the fitting 20 of one clamping plate 17 on the support roller 6, while a bidirectional threaded rod 22 is threadedly connected to the fitting 20 of the other clamping plate 17 on the support roller 6. Limiting blocks 23 are fitted onto the outer walls of both the sliding rod 21 and the bidirectional threaded rod 22. Limiting blocks 23 are fixedly connected to the outer wall of the support 5. A slot 24 is formed on the inner wall of the limiting block 23 fitted onto the outer wall of the bidirectional threaded rod 22. A first chamfer 25 is formed at the end of the slot 24 near the corresponding fitting 20. A straight groove 26 and a threaded groove are formed inside the bidirectional threaded rod 22. The spiral groove 27 and the straight groove 26 are connected to the spiral groove 27. The slider 28 is slidably connected inside the spiral groove 27. The outer wall of the slider 28 is fixedly connected to the connecting block 29. The second spring 30 is fixedly connected to one side of the connecting block 29. The second spring 30 is set inside the bidirectional threaded rod 22. The grooved rod 31 is fixedly connected to the side of the connecting block 29 away from the second spring 30. The end of the grooved rod 31 away from the connecting block 29 has a second chamfer 32. The grooved rod 31 is inserted into the groove hole 24. The end of the grooved rod 31 away from the connecting block 29 is fixedly connected to the rotating wheel 33. The outer walls of the two supports 5 are each inserted with a rotating part 34. The outer walls of the two rotating parts 34 are each threadedly connected with a fixing block 35. The device bracket 2 has a sliding groove 36 inside. The two fixing blocks 35 are slidably connected inside the sliding groove 36. The outer wall of the sliding groove 36 has a scale setting, which makes it convenient for the staff to determine the distance between the two supports 5 according to the scale. The adjustment component is used to assist the operator in positioning the steel section 7, aligning the bending head 4 with the center of the steel section 7 to ensure that the pressure is applied perpendicularly to the axial direction of the steel section 7, ensuring uniform stress distribution across the cross section, and avoiding additional bending moments caused by eccentricity, which could lead to local stress concentration and premature failure of the steel section 7, affecting the accuracy of the test data. The adjustment component is also used to assist the operator in adjusting the distance between the two supports 5, allowing the operator to adjust the spacing between the two supports 5 according to the dimensions of the steel section 7 to meet the test requirements of the bending test. Specifically, when the staff needs to perform a bending test on the steel section 7, the steel section 7 is first placed on top of the support rollers 6 of the two supports 5, and the rotating wheel 33 is pressed down, causing the rotating wheel 33 to drive the groove rod 31 to disengage from the rotation limit of the groove hole 24. The rotating wheel 33 compresses the second spring 30 through the groove rod 31 and the connecting block 29, causing the slider 28 to slide along the inside of the spiral groove 27. Since the rotation of the groove rod 31 is limited by the groove hole 24 at this time, the slider 28 will drive the bidirectional threaded rod 22 to rotate 90 degrees through the spiral groove 27, causing the corresponding fittings 20 on the outer wall of the bidirectional threaded rod 22 to move closer to each other along the outer wall of the bidirectional threaded rod 22 until the slider 28 enters from the inside of the spiral groove 27. After the straight groove 26 is inside, the bidirectional threaded rod 22 stops rotating, and the grooved rod 31 disengages from the inside of the slot 24. At this time, the operator rotates the rotating wheel 33, causing the rotating wheel 33 to drive the bidirectional threaded rod 22 to rotate continuously through the grooved rod 31, connecting block 29, slider 28, and straight groove 26, until the two components 20 on the bidirectional threaded rod 22 drive the corresponding clamping plates 17 to move closer together, clamping and calibrating the steel section 7 to the center position of the bending head 4, and then stopping. This is to meet the test requirements and ensure the accuracy of the bending data of the steel section 7, so as to determine whether the bending resistance of the steel section 7 meets the requirements of the seismic bracing and to prevent substandard seismic bracing from entering the market. The clamping and calibration of the steel section 7 by the clamping plates 17 is carried out during this process. During the process, clamping plate 17 will drive clamping plate 17 on another support roller 6 to move synchronously through L-shaped connecting rod 18 and sleeve rod 19, and simultaneously clamp and calibrate the profile 7 to ensure the positioning accuracy of the profile 7. It should be noted that after the clamping and calibration of the profile 7 is completed, after the operator stops pressing and rotating the rotating wheel 33, the second spring 30 will push the connecting block 29 to reset, so that the connecting block 29 drives the slider 28 to slide and reset along the inside of the straight groove 26 and drive the groove rod 31 to reset, until the groove rod 31 is re-inserted into the inside of the groove hole 24 through the guide of the second chamfer 32 and the first chamfer 25. After limiting the rotation of the groove rod 31, the slider 28 begins to disengage from the inside of the straight groove 26. As the slide block 28 enters the spiral groove 27, it pushes the bidirectional threaded rod 22 to reverse 90 degrees through the spiral groove 27. This causes the bidirectional threaded rod 22 to move the clamping plates 17 away from each other through the corresponding kit 20, stopping the clamping plates 17 from holding the steel profile 7. The clamping plates 17 then remain on both sides of the steel profile 7, achieving the effect of automatically stopping the clamping after clamping and calibrating the steel profile 7. This avoids friction between the steel profile 7 and the clamping plates 17 when bending the steel profile 7 later, which would affect the accuracy of detecting the pressure required for bending the steel profile 7. Furthermore, by setting the clamping plates 17 to remain on both sides of the steel profile 7, the steel profile 7 can be blocked when it reaches the bending limit and breaks, preventing the steel profile 7 from flying off. Furthermore, when the operator needs to adjust the distance between the two supports 5, firstly, rotate the rotating component 34 in the opposite direction, so that the rotating component 34 gradually separates from the fixed block 35 through the thread, so that the fixed block 35 stops pressing against the top of the inner wall of the slide groove 36. At this time, the limiting effect of the rotating component 34 and the fixed block 35 on the support 5 disappears, and the operator can move the support 5, so that the support 5 moves along the slide groove 36 through the rotating component 34 and the fixed block 35 until the distance between the two supports 5 reaches the required level. Then, the operator rotates the rotating component 34 to reset, so that the rotating component 34 gradually approaches the fixed block 35 through the thread, clamping and fixing the support 5 in this position. This makes it convenient for the operator to adjust the distance between the two supports 5 according to the steel profile 7, improving the operator's user experience.
[0020] Working principle: When the staff needs to conduct a bending resistance test on the steel section 7 of the seismic brace made of new materials, the position of the camera 16 is first adjusted and fixed by the clamping plate 14 and the elastic plate 15 to ensure that the camera 16 can record the entire bending process of the steel section 7. This allows the staff to observe and study the cracks at the bending angles of the steel section 7. Then, the distance between the two supports 5 is adjusted by the rotating part 34 and the fixing block 35 so that the support rollers 6 on the two supports 5 meet the required distance for the steel section 7 test, thus meeting the prerequisite requirements for the bending test. Finally, the steel section 7 is placed on top of the support rollers 6 on the two supports 5, and then the rotating wheel 33 is pressed and rotated, causing the clamping plate 17 to hold the steel section 7 in place. 7. The clamp is aligned with the center of the bending head 4 to ensure that the steel section 7 is aligned with the center of the bending head 4. This ensures that the pressure is applied perpendicularly to the axial direction of the steel section 7, guarantees a uniform distribution of cross-sectional stress, and avoids additional bending moments caused by eccentricity, which could lead to premature failure due to localized stress concentration in the steel section 7 and affect the accuracy of the test data. When the operator releases the rotating wheel 33, the clamping plate 17 stops clamping the steel section 7 and blocks both sides of the steel section 7. This prevents friction between the steel section 7 and the clamping plate 17 during subsequent bending, which would affect the accuracy of the bending pressure required for the steel section 7. Furthermore, when the steel section 7 reaches its bending limit and breaks, it can be blocked to prevent the steel section 7 from flying off. This, combined with the protective components, further improves the protective effect.
[0021] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.
Claims
1. A device for testing the bending force of a seismic brace, comprising a main body (1), characterized in that, A device bracket (2) is fixedly installed on the top of the main body (1) of the device. A hydraulic cylinder (3) is fixedly installed on the top of the device bracket (2). A bending head (4) is fixedly connected to the end of the inner rod of the hydraulic cylinder (3). Two supports (5) are provided inside the device bracket (2). Support rollers (6) are rotatably connected inside the two supports (5). A section steel (7) is provided on the top of the two support rollers (6). A protective component is used to assist workers in recording the bending process of the steel section (7). The protective component is connected to the hydraulic cylinder (3) and the bending head (4). An adjustment component is used to assist workers in placing and aligning the steel section (7). The adjustment component is connected to the device bracket (2), support (5) and support roller (6).
2. The seismic bracing bending force testing device according to claim 1, characterized in that, The protective assembly includes a collar (8) sleeved on the outer wall of the inner rod of the hydraulic cylinder (3). A sleeve (9) is fixedly connected to the outer wall of the collar (8). A first spring (10) is provided inside the sleeve (9). A connecting rod (11) is inserted into the first spring (10). The first spring (10) abuts against the end of the connecting rod (11) near the collar (8).
3. The seismic bracing bending force testing device according to claim 2, characterized in that, The end of the connecting rod (11) away from the collar (8) is fixedly connected to a protective shell (12). A protective plate (13) is snapped onto the side of the protective shell (12) near the connecting rod (11). Two clips (14) are provided inside the protective shell (12). An elastic piece (15) is fixedly connected to one side of each of the two clips (14). The elastic piece (15) abuts against the inside of the protective shell (12). A camera (16) is provided between the two elastic pieces (15).
4. The seismic bracing bending force testing device according to claim 1, characterized in that, The adjustment assembly includes multiple clamping plates (17) slidably connected to the outer walls of the two support rollers (6). Each of the multiple clamping plates (17) has an L-shaped connecting rod (18) fixedly connected to its outer wall. The outer wall of the L-shaped connecting rod (18) is slidably connected to a sleeve rod (19). The L-shaped connecting rod (18) is connected to the L-shaped connecting rod (18) of the clamping plate (17) on the adjacent support roller (6) through the sleeve rod (19).
5. The seismic bracing bending force testing device according to claim 4, characterized in that, The outer wall of the clamping plate (17) is fixedly connected to a kit (20). A slide rod (21) is inserted inside the kit (20) of the clamping plate (17) of one of the support rollers (6). A double-threaded rod (22) is threaded inside the kit (20) of the clamping plate (17) of the other support roller (6). A limit block (23) is sleeved on the outer wall of both the slide rod (21) and the double-threaded rod (22). The limit block (23) is fixedly connected to the outer wall of the support (5).
6. The seismic bracing bending force testing device according to claim 5, characterized in that, The inner wall of the limiting block (23) sleeved on the outer wall of the bidirectional threaded rod (22) is provided with a slot (24). The slot (24) is provided with a first chamfer (25) at one end near the corresponding kit (20). The inside of the bidirectional threaded rod (22) is provided with a straight groove (26) and a spiral groove (27). The straight groove (26) and the spiral groove (27) are connected.
7. The seismic bracing bending force testing device according to claim 6, characterized in that, The spiral groove (27) is slidably connected to a slider (28), and a connecting block (29) is fixedly connected to the outer wall of the slider (28). A second spring (30) is fixedly connected to one side of the connecting block (29), and the second spring (30) is disposed inside the bidirectional threaded rod (22).
8. The seismic bracing bending force testing device according to claim 7, characterized in that, A grooved rod (31) is fixedly connected to the side of the connecting block (29) away from the second spring (30). A second chamfer (32) is provided at the end of the grooved rod (31) away from the connecting block (29). The grooved rod (31) is inserted into the inside of the slot (24). A rotating wheel (33) is fixedly connected to the end of the grooved rod (31) away from the connecting block (29).
9. The seismic bracing bending force testing device according to claim 1, characterized in that, Rotating parts (34) are inserted into the outer walls of both supports (5), and fixed blocks (35) are threadedly connected to the outer walls of both rotating parts (34). A sliding groove (36) is provided inside the device bracket (2), and the two fixed blocks (35) are slidably connected inside the sliding groove (36).