A device for detecting impact resistance of a cable protection pipe

Abstract

This invention belongs to the field of pipeline inspection technology, and specifically relates to an impact resistance testing device for cable protection pipes. It includes a base, two clamping mechanisms, and an impact mechanism. The two clamping mechanisms are respectively located on the top sides of the base, and the impact mechanism is located on the top of the base with its impact end extending between the two clamping mechanisms. The device also includes: a centering positioning mechanism located at the top edges of the base, with the centering positioning mechanism aligned with the two clamping mechanisms; a self-locking telescopic mechanism connected to the two centering positioning mechanisms inside the base, capable of locking the centering positioning mechanism after tensioning; and a pressing mechanism located on both sides of the impact mechanism, with its pressing end acting on the top of the self-locking telescopic mechanism. This invention enables automatic centering and anti-rotation clamping of the protection pipe, and simultaneously automatically measures deformation and pressure data, improving the accuracy and efficiency of the inspection.

Description

Technical Field

[0001] This invention belongs to the field of pipeline inspection technology, and in particular relates to an impact resistance testing device for cable protection pipes. Background Technology

[0002] As a key protective component in the laying of power and communication lines, cable protection pipes must withstand complex external forces such as underground soil compression, construction machinery collisions, and heavy ground crushing over long periods of time. Their impact resistance directly determines the operational safety and service life of the pipeline system. Therefore, conducting impact resistance testing on cable protection pipes is a crucial means to ensure the quality of pipeline projects.

[0003] According to industry testing standards, the impact resistance test of cable protection pipes requires the use of a simply supported beam loading method. The impact point must be precisely applied to the center between the two support points of the protection pipe, as disclosed in announcement number CN121805035A, which describes a performance testing device for cable protection pipes. However, existing impact resistance testing devices cannot achieve rapid centering of the protection pipe. During clamping, positioning tools or multiple adjustments to the position of the protection pipe are required to align the center of the protection pipe with the impact head. This is not only cumbersome and time-consuming, but also prone to impact point deviation due to manual positioning errors, resulting in distorted test data. Furthermore, the protection pipe is prone to circumferential rotation and lateral movement during the testing process, further compromising the accuracy of the impact point and reducing the test precision.

[0004] Therefore, an impact resistance testing device for cable protection pipes is proposed. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a cable protection pipe impact resistance testing device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a cable protection pipe impact resistance testing device, comprising a base, two clamping mechanisms and an impact mechanism, wherein the two clamping mechanisms are respectively disposed on the top sides of the base, and the impact mechanism is disposed on the top of the base, with the impact end extending between the two clamping mechanisms, and further comprising: A centering positioning mechanism is located at the top two edges of the base, and the centering positioning mechanism and the two clamping mechanisms are on the same straight line. The base is equipped with a self-locking telescopic mechanism connected to the two centering positioning mechanisms, and the self-locking telescopic mechanism can lock the centering positioning mechanism after it is tightened. The pressing mechanism is located on both sides of the impact end of the impact mechanism, and the pressing end of the pressing mechanism can act on the top of the self-locking telescopic mechanism, and the protective tube is centered by pulling the centering positioning mechanism. The distance detection mechanism is located on one side of the pressing mechanism, and is used to detect the pressing distance of the protective tube. The controller is fixedly mounted on the top of the base, and the clamping mechanism, impact mechanism, self-locking telescopic mechanism and distance detection mechanism are all electrically connected to the controller.

[0007] Preferably, the clamping mechanism includes a lower clamp fixedly disposed on the top of the machine base, an upper clamp disposed above the lower clamp, an L-shaped support plate fixedly disposed on the side wall of the lower clamp, a first hydraulic cylinder fixedly disposed on the top of the L-shaped support plate, and the moving end of the first hydraulic cylinder being fixedly connected to the top of the upper clamp.

[0008] Preferably, the lower clamp and the upper clamp are provided with V-shaped grooves on opposite sides, and the lower clamp and the upper clamp on both sides are provided with the same protective tube.

[0009] Preferably, the impact mechanism includes an L-shaped bracket fixedly mounted on the top of the base, a second hydraulic cylinder is provided on the top of the L-shaped bracket, a pressure sensor is fixedly mounted on the moving end of the second hydraulic cylinder, and an impact head is fixedly mounted on the detection end of the pressure sensor.

[0010] Preferably, the centering positioning mechanism includes sliding grooves disposed on both sides of the top of the base, a slider is provided inside the sliding groove, and anti-drop sliding rods connected to the slider are symmetrically fixed on the side wall of the sliding groove. The rod walls of the two anti-drop sliding rods are each sleeved with a first spring, and the two ends of the first spring are respectively fixedly connected to the side wall of the sliding groove and the side wall of the slider. An upwardly extending L-shaped connecting rod is fixedly provided on the side wall of the slider, and a centering positioning plate is fixedly provided at the upper end of the L-shaped connecting rod.

[0011] Preferably, multiple anti-slip strips are fixedly provided on one side of the centering positioning plates on both sides. The multiple anti-slip strips are arranged in a ring, and the diameter of the circle formed by the multiple anti-slip strips matches the diameter of the protective tube.

[0012] Preferably, the self-locking telescopic mechanism includes a telescopic plate horizontally located inside the base. Two telescopic rods are symmetrically fixed between the lower surface of the telescopic plate and the inner wall of the base. Two pull ropes are fixed on both sides of the telescopic plate, and the ends of the two pull ropes away from the telescopic plate are respectively fixedly connected to the side walls of the two side sliders. A support plate is fixedly provided on the inner side wall of the base. Two electromagnetic shaft locks are fixedly provided on the surface of the support plate. The telescopic ends of the two telescopic rods are respectively located inside the two electromagnetic shaft locks.

[0013] Preferably, the pressing mechanism includes fixed rods fixedly disposed on both sides of the moving end of the second hydraulic cylinder, and a pressing rod is vertically slidably disposed at the ends of the two fixed rods. A fixed plate is fixedly disposed at the upper end of the pressing rod, and a second spring is sleeved on the rod wall of the pressing rod, and the two ends of the second spring are fixedly connected to the fixed rod and the fixed plate, respectively.

[0014] Preferably, the distance detection mechanism includes brackets fixedly disposed on both sides of the end of the fixed rod, and an optical grating ruler is fixedly disposed between the interior of the bracket and the wall of the fixed rod, and the reading head of the optical grating ruler is fixedly connected to the wall of the pressing rod.

[0015] Compared with existing technologies, the advantages of this invention are as follows: 1. Through the central positioning mechanism and self-locking telescopic mechanism, driven by a second hydraulic cylinder, there is no need to install an additional independent power component. With the help of the telescopic plate, telescopic rod, pull rope, and central positioning plate, the protective tube can be automatically aligned and corrected. It can quickly align the center point of the protective tube with the impact head position, eliminating the need for manual repeated tube adjustment and measuring tool-assisted positioning. In addition, with the clamping mechanism on both sides, the tube opening and tube body are double limited, resulting in high clamping stability, reducing test errors caused by clamping misalignment, and improving testing efficiency and accuracy.

[0016] 2. By setting anti-slip strips on the central positioning plate, the anti-slip strips and the opening of the protective tube fit tightly together, increasing the frictional resistance of the end face contact. Combined with the clamping action on both sides, a two-way constraint is formed from the end of the protective tube to the tube body, effectively preventing the protective tube from slipping and rotating circumferentially during the pressure process, and preventing the impact point from shifting and causing the test to fail.

[0017] 3. Through the set distance detection mechanism, the reading head moves synchronously with the pressure rod. Combined with the pressure sensor to collect load changes in real time, the pressure changes suddenly when the protective tube breaks under pressure. The controller automatically locks the displacement start and end data and automatically measures the bending deformation of the protective tube. This not only eliminates the operational errors of manual marking and caliper measurement, but also allows the deformation data to be stored for product development and comparison. Attached Figure Description

[0018] Figure 1 This is a perspective view of a cable protection pipe impact resistance testing device provided by the present invention; Figure 2 This is a first-view perspective perspective view of the cable protection pipe impact resistance testing device provided by the present invention after the clamping mechanism is removed; Figure 3 This is a second-view perspective perspective view of a cable protection pipe impact resistance testing device provided by the present invention after the clamping mechanism is removed; Figure 4 This is a perspective view of the centering positioning mechanism in a cable protection pipe impact resistance testing device provided by the present invention; Figure 5 This is a perspective view of a component on the moving end of the second hydraulic cylinder of a cable protection pipe impact resistance testing device provided by the present invention; Figure 6 This is a perspective view of the distance detection mechanism on the fixed rod in a cable protection pipe impact resistance testing device provided by the present invention.

[0019] In the diagram: 1. Base, 2. Clamping mechanism, 21. Lower clamp, 22. Upper clamp, 23. L-shaped support plate, 24. First hydraulic cylinder, 3. Impact mechanism, 31. L-shaped bracket, 32. Second hydraulic cylinder, 33. Pressure sensor, 34. Impact head, 4. Centering positioning mechanism, 41. Slide groove, 42. Slider, 43. Anti-falling slide rod, 44. First spring, 45. L-shaped connecting rod, 46. Centering positioning plate, 47. Anti-slip strip, 5. Self-locking telescopic mechanism, 51. Telescopic plate, 52. Telescopic rod, 53. Pull rope, 54. Support plate, 55. Electromagnetic shaft lock, 6. Pressing mechanism, 61. Fixed rod, 62. Pressing rod, 63. Fixed plate, 64. Second spring, 7. Distance detection mechanism, 71. Bracket, 72. Grating ruler, 73. Reading head, 8. Controller. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] like Figures 1-4 As shown, an impact resistance testing device for cable protection pipes includes a base 1, two clamping mechanisms 2, and an impact mechanism 3. The two clamping mechanisms 2 are respectively disposed on the top sides of the base 1. Each clamping mechanism 2 includes a lower clamping seat 21 fixedly disposed on the top of the base 1, an upper clamping seat 22 disposed above the lower clamping seat 21, an L-shaped support plate 23 fixedly disposed on the side wall of the lower clamping seat 21, a first hydraulic cylinder 24 fixedly disposed on the top of the L-shaped support plate 23, and the moving end of the first hydraulic cylinder 24 fixedly connected to the top of the upper clamping seat 22. V-shaped grooves are provided on opposite sides of the lower clamping seat 21 and the upper clamping seat 22. The interiors of the lower clamping seat 21 and the upper clamping seat 22 are provided with... The same protective tube has a fixed installation spacing between the two lower clamping seats 21, which ensures that the impact point of the protective tube falls in the middle position of the two lower clamping seats 21; the impact mechanism 3 is set on the top of the base 1, and the impact end extends between the two clamping mechanisms 2. The impact mechanism 3 includes an L-shaped bracket 31 fixedly set on the top of the base 1, a second hydraulic cylinder 32 is set on the top of the L-shaped bracket 31, a pressure sensor 33 is fixedly set on the moving end of the second hydraulic cylinder 32, and an impact head 34 is fixedly set on the detection end of the pressure sensor 33. The lower end of the impact head 34 is an arc-shaped end face, which can disperse the impact stress and reduce the squeezing damage to the protective tube. It also includes: A centering positioning mechanism 4 is located at the top two edges of the base 1, and is aligned with the two clamping mechanisms 2. The centering positioning mechanism 4 includes a sliding groove 41 located on both sides of the top of the base 1. A slider 42 is located inside the sliding groove 41. Anti-detachment sliding rods 43, connected to the sliders 42, are symmetrically fixed to the side walls of the sliding groove 41. First springs 44 are fitted onto the walls of both anti-detachment sliding rods 43, and the two ends of the first springs 44 are fixedly connected to the side walls of the sliding groove 41 and the sliders 42, respectively. An upwardly extending L-shaped connecting rod 45 is fixed to the side wall of the slider 42, and a centering positioning plate 46 is fixed to the upper end of the L-shaped connecting rod 45. In the absence of external force, the first spring 44 applies a spring force to the slider 42, causing the slider 42 to move towards the edge of the base 1. Simultaneously, the centering positioning plate 46 is held in place by the L-shaped connecting rod 45. The 6-axis moves to the edge of the base 1; multiple anti-slip strips 47 are fixed on one side of the two centering positioning plates 46, and the multiple anti-slip strips 47 are arranged in a ring, and the diameter of the circle formed by the multiple anti-slip strips 47 matches the diameter of the protective tube. The anti-slip strips 47 are patterned steel metal strips with anti-slip patterns pressed on the surface. They are hard, wear-resistant and not easily deformed. The protective tube opening is squeezed by the interlocking of the concave and convex patterns, which provides high friction and is not easily worn or failed after repeated use. When the two centering positioning plates 46 are in contact with the opening of the protective tube, the anti-slip strips 47 can increase the friction of the contact surface with the opening, and prevent the protective tube from rotating during the testing process. It should be noted that the cut length of the protective tube is fixed, and the relative movement distance of the two centering positioning plates 46 is within a safe range to avoid excessive squeezing force on both ends of the protective tube by the two centering positioning plates 46, which may cause damage.

[0022] like Figures 1-3 As shown, the machine base 1 is equipped with a self-locking telescopic mechanism 5 connected to two centering positioning mechanisms 4, and the self-locking telescopic mechanism 5 can lock the centering positioning mechanism 4 after it is tightened; the self-locking telescopic mechanism 5 includes a telescopic plate 51 located horizontally inside the machine base 1, and two telescopic rods 52 are symmetrically fixed between the lower surface of the telescopic plate 51 and the inner wall of the machine base 1. Two pull ropes 53 are fixed on both sides of the telescopic plate 51, and the ends of the two pull ropes 53 away from the telescopic plate 51 are respectively fixedly connected to the side walls of the sliders 42 on both sides. A support plate 54 is fixedly provided on the inner side wall of the base 1. Two electromagnetic shaft locks 55 are fixedly provided on the surface of the support plate 54. The telescopic ends of the two telescopic rods 52 are respectively located inside the two electromagnetic shaft locks 55. The electromagnetic shaft locks 55 are equipped with clamping claws. Under normal conditions, the claws are open, and the telescopic rods 52 can extend and retract freely. After the power signal is applied, the electromagnetic coil is attracted and drives the claws to tighten inward, clamping the moving end of the telescopic rods 52 so that it cannot move up and down. After the power is cut off, the claws are released, and the moving end of the telescopic rods 52 resumes free movement.

[0023] like Figures 1-3 and Figure 5As shown, the pressing mechanism 6 is located on both sides of the impact end of the impact mechanism 3, and the pressing end of the pressing mechanism 6 can act on the top of the self-locking telescopic mechanism 5. The protective tube is centered by pulling the centering positioning mechanism 4. The pressing mechanism 6 includes fixed rods 61 fixedly installed on both sides of the moving end of the second hydraulic cylinder 32. The ends of the two fixed rods 61 are vertically slidably provided with pressing rods 62. The upper end of the pressing rods 62 is fixedly provided with a fixed plate 63. The rod wall of the pressing rods 62 is sleeved with a second spring 64, and the two ends of the second spring 64 are fixedly connected to the fixed rods 61 and the fixed plate 63 respectively. The elastic force of the second spring 64 is greater than that of the first spring 44, ensuring that when the pressing rods 62 move down initially, they can press down the telescopic plate 51 and pull the centering positioning plates 46 on both sides. After the telescopic plate 51 is locked, an upward thrust is applied to the pressing rods 62, driving the pressing rods 62 to lift up.

[0024] like Figures 5-6 As shown, the distance detection mechanism 7 is located on one side of the pressing mechanism 6, and the distance detection mechanism 7 is used to detect the pressing distance of the protective tube, thereby detecting the bending deformation of the protective tube; the distance detection mechanism 7 includes a bracket 71 fixedly installed on both sides of the end of the fixed rod 61, and a grating ruler 72 is fixedly installed between the inside of the bracket 71 and the rod wall of the fixed rod 61. The reading head 73 of the grating ruler 72 is fixedly connected to the rod wall of the pressing rod 62. The grating ruler 72 has a sealed structure with a sealing strip to reduce the impact of dust on the use effect of the grating ruler 72.

[0025] like Figure 1 As shown, the controller 8 is fixedly installed on the top of the base 1. The clamping mechanism 2, the impact mechanism 3, the self-locking telescopic mechanism 5 and the distance detection mechanism 7 are all electrically connected to the controller 8.

[0026] The operating principle of the present invention is described as follows: The testing personnel first place the protective tube of fixed length into the lower clamping seats 21 on both sides of the top of the machine base 1. The first hydraulic cylinders 24 on both sides are started by the controller 8. The first hydraulic cylinders 24 on both sides extend and drive the corresponding upper clamping seats 22 to move down a certain distance and then stop. The clamping action of the protective tube is not yet completed. At this time, the lower clamping seats 21 and the upper clamping seats 22 on both sides can complete the initial positioning of the protective tube and avoid the protective tube from deviating by a large range. Subsequently, the controller 8 activates the second hydraulic cylinder 32. The second hydraulic cylinder 32 extends and drives the two lower pressure rods 62 to move downward, so that the lower ends of the two lower pressure rods 62 press down on the telescopic plate 51. At the same time, the lower surface of the telescopic plate 51 compresses the two telescopic rods 52, and the two sides of the telescopic plate 51 pull down the two ends of the pull rope 53 simultaneously, so that the ends of the two pull ropes 53 respectively pull the slider 42 to overcome the elastic force of the first spring 44 and move on the anti-drop slide rod 43. The two sliders 42 are relatively close, thereby driving the centering positioning plates 46 on both sides to move relative to each other and contact the two ends of the protective tube. As the second hydraulic cylinder 32 continues to extend and the lower pressure rods 62 continue to move downward, the centering positioning plates 46 on both sides retract synchronously, automatically completing the centering correction of the protective tube and ensuring that the center point of the protective tube falls directly below the impact head 34. After the protective tube is centered and positioned, the second hydraulic cylinder 32 continues to extend and drives the impact head 34 to move slowly downward. Once the centering positioning plate 46 is in place, it can no longer move, and the downward movement of the telescopic plate 51 also stops. At this time, the telescopic plate 51 exerts a maximum reverse pushing force on the lower pressure rod 62, causing the lower pressure rod 62 to overcome the elastic force of the second spring 64 and rise upward. This simultaneously drives the reading head 73 of the grating ruler 72 to move. The grating ruler 72 feeds back the displacement data to the controller 8 in real time. Upon receiving the signal, the controller 8 immediately shuts down the second hydraulic cylinder 32 and simultaneously activates the electromagnetic locking shaft on the support plate 54. The device 55 and the first hydraulic cylinders 24 on both sides, the electromagnetic locking device 55 can lock the moving end of the telescopic rod 52, thereby locking the position of the slider 42 and the pull rope 53, so that the centering positioning plate 46 continuously presses the end of the protective tube. At the same time, the controller 8 continues to start the first hydraulic cylinders 24 on both sides to extend, drive the upper clamping seat 22 to move down and cooperate with the lower clamping seat 21 to clamp the two ends of the protective tube. This process adopts the assembly sequence of centering first and then clamping. The tube opening limit and the tube body clamping form a double positioning. The two limits cooperate with each other to effectively ensure the detection accuracy of the subsequent impact resistance test. When the centering positioning plates 46 on both sides are attached to the opening of the protective tube, the multiple anti-slip strips 47 on the surface of the centering positioning plates 46 are in close contact with the opening, which can increase the friction of the contact surface with the opening. Combined with the double clamping structure, it can prevent rotation from both the end anti-slip limit and the tube body clamping, greatly reducing the probability of the impact point shifting due to the rotation of the protective tube, and effectively avoiding the circumferential rotation of the protective tube during the detection pressing process. After the protective tube is positioned and clamped, the controller 8 drives the second hydraulic cylinder 32 to work again. The impact head 34 descends with buffer until it contacts the middle of the protective tube wall. At the same time, the downward pressure rod 62 is continuously pushed upward by the telescopic plate 51. The grating ruler 72 outputs a displacement signal to the controller 8 in real time. The moment the impact head 34 contacts the protective tube, the top pressure sensor 33 experiences a sudden increase in force and feeds back the pressure data to the controller 8. The controller 8 then locks the current grating displacement value as the measurement starting point. The impact head 34 continues to press down, causing the protective tube to gradually bend and deform until the protective tube breaks. The moment the protective tube fails, the supporting force disappears, and the pressure sensor 33 value drops sharply. The controller 8 then captures the data from the grating ruler 72 as the endpoint position. It automatically calculates the bending deformation of the protective tube when it breaks by using the difference between the start and end values. It automatically captures the start and end displacements by relying on pressure changes. The entire process does not require manual visual measurement of bending and sinking, which saves the operational errors of manual marking and caliper measurement. It can also save deformation data for product development and comparison. During this process, the controller 8 will collect the load data fed back by the pressure sensor 33 in real time and automatically store the maximum pressure value that occurs throughout the test. This peak pressure can intuitively reflect the ultimate load that the protective tube can withstand, making it convenient for staff to evaluate the impact resistance of the protective tube based on the data.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cable protection pipe impact resistance testing device, comprising a base (1), two clamping mechanisms (2) and an impact mechanism (3), wherein the two clamping mechanisms (2) are respectively disposed on the top sides of the base (1), and the impact mechanism (3) is disposed on the top of the base (1), with the impact end extending between the two clamping mechanisms (2), characterized in that, Also includes: The centering positioning mechanism (4) is located at the top two sides of the base (1), and the centering positioning mechanism (4) and the two clamping mechanisms (2) are on the same straight line. The base (1) is provided with a self-locking telescopic mechanism (5) connected to the two centering positioning mechanisms (4), and the self-locking telescopic mechanism (5) can lock the centering positioning mechanism (4) after it is tightened. The pressing mechanism (6) is located on both sides of the impact end of the impact mechanism (3), and the pressing end of the pressing mechanism (6) can act on the top of the self-locking telescopic mechanism (5) to center the protective tube by pulling the centering positioning mechanism (4). The distance detection mechanism (7) is located on one side of the pressing mechanism (6), and the distance detection mechanism (7) is used to detect the pressing distance of the protective tube; The controller (8) is fixedly installed on the top of the base (1). The clamping mechanism (2), impact mechanism (3), self-locking telescopic mechanism (5) and distance detection mechanism (7) are all electrically connected to the controller (8).

2. The impact resistance testing device for cable protection pipes according to claim 1, characterized in that, The clamping mechanism (2) includes a lower clamp (21) fixedly disposed on the top of the base (1), an upper clamp (22) is provided above the lower clamp (21), an L-shaped support plate (23) is fixedly disposed on the side wall of the lower clamp (21), a first hydraulic cylinder (24) is fixedly disposed on the top of the L-shaped support plate (23), and the moving end of the first hydraulic cylinder (24) is fixedly connected to the top of the upper clamp (22).

3. The impact resistance testing device for cable protection pipes according to claim 2, characterized in that, The lower clamp (21) and the upper clamp (22) are provided with V-shaped grooves on opposite sides, and the lower clamp (21) and the upper clamp (22) on both sides are provided with the same protective tube.

4. The impact resistance testing device for cable protection pipes according to claim 1, characterized in that, The impact mechanism (3) includes an L-shaped bracket (31) fixedly installed on the top of the base (1). The top of the L-shaped bracket (31) is provided with a second hydraulic cylinder (32). The moving end of the second hydraulic cylinder (32) is fixedly provided with a pressure sensor (33). The detection end of the pressure sensor (33) is fixedly provided with an impact head (34).

5. The impact resistance testing device for cable protection pipes according to claim 1, characterized in that, The centering positioning mechanism (4) includes a slide groove (41) set on both sides of the top of the base (1). The slide groove (41) is provided with a slider (42). The side wall of the slide groove (41) is symmetrically fixed with anti-drop slide rods (43) connected to the slider (42). The rod walls of the two anti-drop slide rods (43) are each sleeved with a first spring (44). The two ends of the first spring (44) are fixedly connected to the side wall of the slide groove (41) and the side wall of the slider (42) respectively. The side wall of the slider (42) is fixedly provided with an upwardly extending L-shaped connecting rod (45), and the upper end of the L-shaped connecting rod (45) is fixedly provided with a centering positioning plate (46).

6. The impact resistance testing device for cable protection pipes according to claim 5, characterized in that, Multiple anti-slip strips (47) are fixedly provided on the opposite side of the centering positioning plate (46) on both sides. The multiple anti-slip strips (47) are arranged in a ring, and the diameter of the circle formed by the multiple anti-slip strips (47) matches the diameter of the protective tube.

7. The impact resistance testing device for cable protection pipes according to claim 5, characterized in that, The self-locking telescopic mechanism (5) includes a telescopic plate (51) horizontally located inside the base (1). Two telescopic rods (52) are symmetrically fixed between the lower surface of the telescopic plate (51) and the inner wall of the base (1). Two pull ropes (53) are fixed on both sides of the telescopic plate (51), and the ends of the two pull ropes (53) away from the telescopic plate (51) are respectively fixedly connected to the side walls of the sliders (42) on both sides. A support plate (54) is fixedly provided on the inner side wall of the base (1). Two electromagnetic shaft locks (55) are fixedly provided on the surface of the support plate (54). The telescopic ends of the two telescopic rods (52) are respectively located inside the two electromagnetic shaft locks (55).

8. The impact resistance testing device for cable protection pipes according to claim 4, characterized in that, The pressing mechanism (6) includes fixed rods (61) fixedly disposed on both sides of the moving end of the second hydraulic cylinder (32). The ends of the two fixed rods (61) are vertically slidably provided with pressing rods (62). The upper end of the pressing rods (62) is fixedly provided with a fixed plate (63). The rod wall of the pressing rods (62) is sleeved with a second spring (64), and the two ends of the second spring (64) are fixedly connected to the fixed rods (61) and the fixed plate (63) respectively.

9. The impact resistance testing device for cable protection pipes according to claim 8, characterized in that, The distance detection mechanism (7) includes brackets (71) fixedly installed on both sides of the end of the fixed rod (61). A grating ruler (72) is fixedly installed between the inside of the bracket (71) and the wall of the fixed rod (61). The reading head (73) of the grating ruler (72) is fixedly connected to the wall of the pressing rod (62).

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