Performance detection device for cable protection pipe

Abstract

The invention discloses a performance detection device for a cable protection pipe, and belongs to the field of cable protection pipe detection, the device comprises a box body, a to-be-detected protection pipe is installed in the box body, the top wall of the box body is fixedly connected with a hydraulic rod, and the output end of the hydraulic rod is fixedly connected with an N-shaped block; a pressing block is slidably connected to the middle of the N-shaped block, a plurality of first annular cylinders are slidably connected to the middle of the pressing block in a linear array mode, second annular cylinders are slidably connected to the middles of the first annular cylinders, and cylinders are slidably connected to the middles of the second annular cylinders. The pressing block, the first annular cylinder and the second annular cylinder sequentially move upwards to the N-shaped block, so that the pressure intensity borne by the to-be-detected protective tube is gradually increased; the device can change the stress area of the protection pipe to change the pressure intensity while maintaining the fixed output pressure, simulates the pressure applying state of stratum sand and stones on the protection pipe, and provides a reliable basis for the quality control and engineering application of the cable protection pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of cable protection tube detection, in particular to a performance detection device for cable protection tubes. Background Art

[0002] In the power transmission and communications sectors, cable protection conduits play a crucial role in protecting cables from mechanical damage, chemical corrosion, and environmental erosion. Their performance directly impacts the safe and stable operation of cable systems. Therefore, accurate and comprehensive performance testing of cable protection conduits is crucial. Compressive strength, a core indicator of their ability to withstand external pressure in actual use, is a key component of testing. Currently, most traditional devices for testing the compressive performance of cable protection tubes use a fixed pressure area and constant pressure method to test the tubes. However, in actual application scenarios, when cable protection tubes are buried underground and the ground is subjected to vehicle rolling, heavy objects piled up, and so on, the pressure area and pressure on the tubes from objects such as sand and gravel in the stratum change dynamically. Existing testing methods are unable to truly simulate this complex actual stress condition, resulting in a large deviation between the test results and the compressive performance of the tubes in actual use. This makes it difficult to accurately assess the compressive capacity of the tubes in real environments, and thus cannot provide a reliable basis for quality control and engineering applications of cable protection tubes. Summary of the Invention

[0003] The purpose of the present invention is to provide a performance testing device for a cable protection tube, which solves the problem of large deviation between the test results and the compressive performance of the protection tube in actual use.

[0004] To achieve the above objectives, the present invention provides the following technical solutions: a performance testing device for a cable protective tube, comprising a box, wherein the protective tube to be tested is installed in the box, a hydraulic rod is fixedly connected to the top wall of the box, an N-shaped block is fixedly connected to the output end of the hydraulic rod, and vertical portions on both sides of the N-shaped block are used to limit the protective tube to be tested; A pressure block is slidably connected to the middle of the N-shaped block, and a plurality of first annular cylinders are slidably connected to the middle of the pressure block in a linear array. The middle of the plurality of first annular cylinders are slidably connected to a second annular cylinder, and the middle of the plurality of second annular cylinders are slidably connected to a cylinder. The plurality of cylinders are fixedly connected to the N-shaped block. The hydraulic rod applies a constant driving force to the pressure block through the N-shaped block. When the output force of the hydraulic rod remains unchanged, the pressure block, the first annular cylinder, and the second annular cylinder are sequentially moved upward on the N-shaped block, thereby gradually increasing the pressure on the protective tube to be inspected.

[0005] Preferably, a mounting seat is hingedly connected to the bottom wall of the box body, a through hole for inserting the protective tube is opened on the mounting seat, and a clamping cylinder and a sealing cylinder coaxial with the through hole are respectively connected to both sides of the mounting seat.

[0006] Preferably, a sealing cone is slidably connected inside the sealing cylinder, a threaded cylinder is coaxially fixedly connected to the sealing cone, a hole connected to the threaded cylinder is opened in the middle of the sealing cone, a threaded ring is rotatably connected to the mounting seat, and the threaded ring is threadedly connected to the threaded cylinder.

[0007] Preferably, a hose is connected through the side wall of the box body, and the hose is communicated with the threaded barrel.

[0008] Preferably, a key is fixedly connected to the side wall of the sealing cone, and a sliding groove that slides in cooperation with the key is provided on the inner wall of the sealing cylinder.

[0009] Preferably, a first slide rod is fixedly connected to the pressure block, a second slide rod is fixedly connected to the first annular cylinder, a third slide rod is fixedly connected to the second annular cylinder, and a sliding hole is provided on the N-shaped block to cooperate with the first slide rod, the second slide rod and the third slide rod.

[0010] Preferably, the outer wall of the box body is fixedly connected to a piston cylinder, a piston rod is slidably connected in the piston cylinder, a first pipe is connected between the sliding hole of the first sliding rod and the piston cylinder, a second pipe is connected between the sliding hole of the second sliding rod and the piston cylinder, and a third pipe is connected between the sliding hole of the third sliding rod and the piston cylinder; When the piston rod slides in a direction away from the piston cylinder, it can be connected to the first pipe, the second pipe and the third pipe in sequence.

[0011] Preferably, the box is filled with water, and a plurality of rectangular tubes are connected to the side wall of the box, wherein a rectangular plate is slidably connected to each of the plurality of rectangular tubes, and a spring is connected between the rectangular plate and the end of the rectangular tube; A detection rod is fixedly connected to the rectangular plate, and a displacement sensor is provided on the detection rod. When the detection protective tube is damaged, the spring applies pressure to the rectangular plate to allow water in the box to flow into the detection protective tube. When the degree of damage to the detection protective tube is severe, the sliding speed of the detection rod is fast.

[0012] Preferably, a bracket is fixedly connected to the rectangular tube, a control rod is fixedly connected to the bracket, the end of the control rod is fixedly connected to the piston rod, the control rod and the multiple detection rods are provided with anti-slip grooves, and a groove is provided on the lower surface of the control rod. When the control rod drives the piston rod to slide synchronously, the groove can be located on the upper part of the multiple detection rods in turn, so that the corresponding detection rods are unlocked.

[0013] Preferably, a motor is fixedly connected to the bracket, a gear is fixedly connected to the output end of the motor, and teeth meshing with the gear are provided on the control rod.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention installs the cable protective tube in a box, activates the hydraulic rod, and causes the N-shaped block to move downward. In the initial state, the pressing block, the first annular cylinder, the second annular cylinder, and the bottom end of the cylinder are on the same plane, all in contact with and pressurize the protective tube. The output force of the hydraulic rod is controlled to remain unchanged. First, the pressing block is controlled to move upward relative to the N-shaped block. At this time, only the first annular cylinder, the second annular cylinder, and the bottom end of the cylinder exert pressure on the protective tube, and the two vertical parts of the N-shaped block can limit the protective tube, ensuring that it can still stably contact the pressure object when the pressure area is reduced subsequently; then, the first annular cylinder is controlled to move upward. At this time, only the second annular cylinder and the bottom end of the cylinder are in contact with the protective tube; finally, the first annular cylinder is controlled to move upward. At this time, only the cylinder is in contact with the protective tube. By continuously reducing the area of ​​pressure on the protective tube without changing the output pressure of the hydraulic rod, it is possible to simulate the pressure exerted on the protective tube by sand and stones and other objects in the stratum when the protective tube is buried underground and the ground is rolled, thereby facilitating the derivation of the compressive performance of the protective tube in actual use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 is a cross-sectional view of the present invention; Figure 3 This is a schematic structural diagram of the mounting base of the present invention; Figure 4 is a cross-sectional view of an N-shaped block of the present invention; Figure 5 This is a schematic structural diagram of the first annular cylinder of the present invention; Figure 6 It is a structural schematic diagram of the rectangular plate of the present invention; Figure 7 It is a structural schematic diagram of the piston rod of the present invention.

[0016] In the figure: 100, box body; 110, mounting base; 120, clamping cylinder; 130, sealing cylinder; 140, sealing cone; 141, key; 150, threaded cylinder; 160, threaded ring; 170, hose; 200, hydraulic rod; 210, N-shaped block; 220, pressure block; 221, first slide rod; 222, first pipe; 230, first annular cylinder; 231, second slide rod; 232, second pipe; 240, second annular cylinder; 241, third slide rod; 242, third pipe; 250, cylinder; 300, rectangular cylinder; 310, rectangular plate; 320, detection rod; 330, spring; 340, piston cylinder; 350, piston rod; 360, control rod; 361, groove; 370, gear; 380, motor; 390, bracket. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] Reference Figure 1-Figure 7 This embodiment provides a technical solution: a performance testing device for a cable protective tube, comprising a box 100, wherein the protective tube to be tested is installed in the box 100, a hydraulic rod 200 is fixedly connected to the top wall of the box 100, an N-shaped block 210 is fixedly connected to the output end of the hydraulic rod 200, and the vertical portions on both sides of the N-shaped block 210 are used to limit the protective tube to be tested; a pressure block 220 is slidably connected to the middle of the N-shaped block 210, and a plurality of first annular cylinders 230 are slidably connected to the linear array in the middle of the pressure block 220. The middle parts of the multiple first annular cylinders 230 are all slidably connected to the second annular cylinders 240, and the middle parts of the multiple second annular cylinders 240 are all slidably connected to the cylinders 250. The multiple cylinders 250 are all fixedly connected to the N-shaped block 210. The hydraulic rod 200 applies a constant driving force to the pressure block 220 through the N-shaped block 210. When the output force of the hydraulic rod 200 remains unchanged, the pressure block 220, the first annular cylinder 230 and the second annular cylinder 240 move up on the N-shaped block 210 in sequence, thereby gradually increasing the pressure on the protective tube to be inspected.

[0019] When testing the strength of the cable protective tube, the cable protective tube is installed in the box 100, and the hydraulic rod 200 is activated to move the N-shaped block 210 downward. In the initial state, the pressure block 220, the first annular cylinder 230, the second annular cylinder 240, and the bottom ends of the cylinder 250 are on the same plane, all in contact with and pressurizing the protective tube. The output force of the hydraulic rod 200 is controlled to remain unchanged. First, the pressure block 220 is controlled to move upward relative to the N-shaped block 210. At this time, only the first annular cylinder 230, the second annular cylinder 240, and the bottom ends of the cylinder 250 exert pressure on the protective tube. The two vertical parts of the N-shaped block 210 can limit the protective tube, ensuring that it can still stably contact the pressure object when the pressure area is reduced later. Next, the first annular cylinder 230 is controlled to move upward. At this time, only the second annular cylinder 240 and the bottom end of the cylinder 250 are in contact with the protective pipe. Finally, the first annular cylinder 230 is controlled to move upward. At this time, only the cylinder 250 is in contact with the protective pipe. By continuously reducing the area of ​​pressure applied to the protective pipe without changing the output pressure of the hydraulic rod 200, the pressure applied by sand and gravel and other objects in the stratum on the protective pipe when the ground is rolled when the protective pipe is buried underground can be simulated, thereby facilitating the determination of the compressive performance of the protective pipe in actual use.

[0020] A mounting base 110 is hingedly connected to the bottom wall of the box body 100 . A through hole for inserting the protective tube is opened on the mounting base 110 . A clamping cylinder 120 and a sealing cylinder 130 coaxial with the through hole are connected to both sides of the mounting base 110 .

[0021] A door is provided on any side wall of the box body 100. The door is opened to install the protective tube to be tested. The two ends of the protective tube to be tested are respectively inserted into the clamping cylinders 120 on the two mounting seats 110. The clamping cylinders 120 can be provided with a structure similar to a three-jaw chuck to clamp the protective tube, or a nut can be passed through the clamping cylinder 120 to fix the protective tube to the clamping cylinder 120. The sealing cylinder 130 is used to seal the two ends of the protective tube so that the internal space of the protective tube is not connected to the internal space of the box body 100. The bottom of the mounting seat 110 is hinged to the bottom wall of the box body 100 via a hinge seat, so that the mounting seat 110 can swing slightly when the protective pipe is under pressure, simulating the changes of the protective pipe under pressure after burial.

[0022] A sealing cone 140 is slidably connected inside the sealing cylinder 130, and a threaded cylinder 150 is coaxially fixedly connected to the sealing cone 140. A hole communicating with the threaded cylinder 150 is opened in the middle of the sealing cone 140, and a threaded ring 160 is rotatably connected to the mounting seat 110, and the threaded ring 160 is threadedly connected to the threaded cylinder 150.

[0023] The mounting seat 110 is also connected to a mounting frame, and a threaded ring 160 is rotatably connected to the mounting frame. A knob for controlling its rotation is provided on the outer wall of the threaded ring 160. By rotating the threaded ring 160, the threaded tube 150 can slide axially on the sealing tube 130, so that the sealing cone 140 can be inserted into the end of the protective tube. The end of the protective tube is polished and smooth. After the sealing cone 140 is inserted into the end of the protective tube, the conical surface of the sealing cone 140 fits tightly against the inner wall of the end of the protective tube, thereby sealing the end of the protective tube.

[0024] A hose 170 is connected through the side wall of the box body 100 , and the hose 170 is in communication with the threaded barrel 150 .

[0025] The hose 170 is in communication with the threaded barrel 150 , so that the internal space of the protective tube can be in communication with the external space of the box body 100 through the hose 170 , ensuring that the detection is not disturbed by the internal pressure of the protective tube when it is pressurized.

[0026] A key 141 is fixedly connected to the side wall of the sealing cone 140 , and a sliding groove that slides in cooperation with the key 141 is formed on the inner wall of the sealing cylinder 130 .

[0027] The key 141 on the sealing cone 140 enables the threaded ring 160 to drive the threaded barrel 150 to slide axially when the threaded ring 160 rotates without rotating with the threaded ring 160, thereby ensuring that the sealing cone 140 can be stably close to the protective tube.

[0028] The pressing block 220 is fixedly connected to a first slide bar 221 , the first annular cylinder 230 is fixedly connected to a second slide bar 231 , the second annular cylinder 240 is fixedly connected to a third slide bar 241 , and the N-shaped block 210 is provided with sliding holes that cooperate with the first slide bar 221 , the second slide bar 231 and the third slide bar 241 .

[0029] The arrangement of the sliding rods limits the sliding directions of the pressing block 220 , the first annular cylinder 230 , and the second annular cylinder 240 , so that the pressing block 220 , the first annular cylinder 230 , and the second annular cylinder 240 can only move vertically to approach or move away from the protective tube to be inspected.

[0030] The outer wall of the box body 100 is fixedly connected to the piston cylinder 340, and the piston rod 350 is slidably connected inside the piston cylinder 340. The first pipe 222 is connected between the sliding hole of the first sliding rod 221 and the piston cylinder 340, the second pipe 232 is connected between the sliding hole of the second sliding rod 231 and the piston cylinder 340, and the third pipe 242 is connected between the sliding hole of the third sliding rod 241 and the piston cylinder 340; when the piston rod 350 slides in the direction away from the piston cylinder 340, it can be connected with the first pipe 222, the second pipe 232 and the third pipe 242 in sequence.

[0031] Reference Figure 6 and Figure 7, the piston rod 350 has a sufficient length, and the first pipe 222 is connected to the end of the piston cylinder 340. In the initial state, the side wall of the piston rod 350 does not block the connection between the first pipe 222 and the piston cylinder 340, while the connection between the second pipe 232 and the third pipe 242 and the piston cylinder 340 are blocked by the side wall of the piston rod 350 and are not connected to the piston cylinder 340. As the piston rod 350 gradually slides away from the piston cylinder 340, the medium in the sliding hole of the first sliding rod 221 is first extracted by the piston cylinder 340. At this time, the pressure block 220 moves up completely, and at the same time, the end of the piston rod 350 moves to the rear of the connection between the second pipe 232 and the piston cylinder 340. At this time, the second pipe 232 is connected to the piston cylinder 340, so that the piston rod 350 continues to slide to extract the medium in the sliding hole of the second sliding rod 231, and so on, until finally only the cylinder 250 applies pressure to the protective tube; The pressure on the protective tube is gradually increased by the above-mentioned actions until the protective tube is broken to obtain the pressure-bearing performance of the protective tube.

[0032] The box body 100 is filled with water, and a plurality of rectangular tubes 300 are connected to the side walls of the box body 100. A rectangular plate 310 is slidably connected to each of the plurality of rectangular tubes 300, and a spring 330 is connected between the rectangular plate 310 and the end of the rectangular tube 300; a detection rod 320 is fixedly connected to the rectangular plate 310, and a displacement sensor is provided on the detection rod 320. When the detection protective tube is damaged, the spring 330 applies pressure to the rectangular plate 310 to allow the water in the box body 100 to flow into the detection protective tube. When the degree of damage to the detection protective tube is severe, the sliding speed of the detection rod 320 is fast.

[0033] After the protective tube is installed in the box body 100, water is filled into the box body 100 to ensure that the box body 100 is sealed. Since the space inside the protective tube is not connected to the box body 100, the water in the box body 100 will not enter the protective tube. When pressure is applied to the protective tube for testing, if the protective tube is damaged, the water in the box body 100 can flow into the protective tube. The larger the damage to the protective tube, the faster the water flows into the interior of the protective tube. In other words, the faster the rectangular plate 310 slides in the rectangular tube 300. At this time, the displacement sensor detects the sliding distance of the detection rod 320. The control system obtains the sliding distance of the detection rod 320 and calculates the sliding speed of the detection rod 320 based on the start time of the sliding and the corresponding time point after the sliding. The degree of damage to the protective tube is judged by the sliding speed, thereby obtaining the performance of the protective tube.

[0034] A bracket 390 is fixedly connected to the rectangular cylinder 300, and a control rod 360 is fixedly connected to the bracket 390. The end of the control rod 360 is fixedly connected to the piston rod 350. The control rod 360 and multiple detection rods 320 are both provided with anti-slip grooves. A groove 361 is provided on the lower surface of the control rod 360. When the control rod 360 drives the piston rod 350 to slide synchronously, the groove 361 can be located in the upper part of the multiple detection rods 320 in sequence, so that the corresponding detection rods 320 are unlocked.

[0035] Each time the control rod 360 slides, it drives the piston rod 350 to just unblock one of the pipes. At this time, the groove 361 on the lower portion of the control rod 360 is just above one of the detection rods 320. This ensures that each time the pressure on the protective tube changes, only one of the rectangular plates 310 in the rectangular cylinder 300 is in the ready-to-slide state. Thus, the control system can directly determine the corresponding pressure magnitude on the protective tube by sampling different displacement sensors. In addition, when the protective tube is damaged, the pressure conditions of the protective tube can be further changed to conduct further testing to determine the tolerance of the protective tube during underground use after damage. The anti-slip grooves on the control rod 360 and the detection rod 320 are configured so that the control rod 360 can slide relative to the detection rod 320 when sliding along its length direction, thereby enabling the working state of each rectangular tube 300 to be changed.

[0036] The bracket 390 is fixedly connected to the motor 380 , the output end of the motor 380 is fixedly connected to the gear 370 , and the control rod 360 is provided with teeth that mesh with the gear 370 .

[0037] The motor 380 has a self-locking function. When the motor 380 is started, it drives the gear 370 to rotate, so that the gear 370 drives the control rod 360 to slide.

[0038] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A performance testing device for a cable protection tube, comprising a box (100), wherein the protection tube to be tested is installed in the box (100), and is characterized in that: The top wall of the box (100) is fixedly connected to a hydraulic rod (200), the output end of the hydraulic rod (200) is fixedly connected to an N-shaped block (210), and the vertical parts on both sides of the N-shaped block (210) are used to limit the protective pipe to be detected; The middle of the N-shaped block (210) is slidably connected to a pressure block (220), the middle of the pressure block (220) is slidably connected to a plurality of first annular cylinders (230) in a linear array, the middle of the plurality of first annular cylinders (230) are all slidably connected to a second annular cylinder (240), the middle of the plurality of second annular cylinders (240) are all slidably connected to a cylinder (250), and the plurality of cylinders (250) are all fixedly connected to the N-shaped block (210). The hydraulic rod (200) applies a constant driving force to the pressure block (220) through the N-shaped block (210). When the output force of the hydraulic rod (200) remains unchanged, the pressure block (220), the first annular cylinder (230) and the second annular cylinder (240) are sequentially moved upward on the N-shaped block (210), thereby gradually increasing the pressure on the protective tube to be inspected.

2. The performance testing device for a cable protection tube according to claim 1, characterized in that: A mounting seat (110) is hingedly connected to the bottom wall of the box body (100), and a through hole for inserting a protective tube is provided on the mounting seat (110). A clamping cylinder (120) and a sealing cylinder (130) coaxial with the through hole are respectively connected to both sides of the mounting seat (110).

3. The performance testing device for a cable protection tube according to claim 2, characterized in that: A sealing cone (140) is slidably connected to the sealing cylinder (130), a threaded cylinder (150) is coaxially fixedly connected to the sealing cone (140), a hole communicating with the threaded cylinder (150) is opened in the middle of the sealing cone (140), a threaded ring (160) is rotatably connected to the mounting seat (110), and the threaded ring (160) is threadedly connected to the threaded cylinder (150).

4. The performance testing device for a cable protection tube according to claim 3, characterized in that: A hose (170) is connected through the side wall of the box body (100), and the hose (170) is in communication with the threaded barrel (150).

5. The performance testing device for a cable protection tube according to claim 4, characterized in that: A key (141) is fixedly connected to the side wall of the sealing cone (140), and a sliding groove that slides in cooperation with the key (141) is provided on the inner wall of the sealing cylinder (130).

6. The performance testing device for a cable protection tube according to claim 1, characterized in that: The pressing block (220) is fixedly connected to a first slide bar (221), the first annular cylinder (230) is fixedly connected to a second slide bar (231), the second annular cylinder (240) is fixedly connected to a third slide bar (241), and the N-shaped block (210) is provided with a sliding hole that cooperates with the first slide bar (221), the second slide bar (231) and the third slide bar (241).

7. The performance testing device for a cable protection tube according to claim 6, characterized in that: The outer wall of the box body (100) is fixedly connected to a piston cylinder (340), a piston rod (350) is slidably connected inside the piston cylinder (340), a first pipe (222) is connected between the sliding hole of the first sliding rod (221) and the piston cylinder (340), a second pipe (232) is connected between the sliding hole of the second sliding rod (231) and the piston cylinder (340), and a third pipe (242) is connected between the sliding hole of the third sliding rod (241) and the piston cylinder (340); When the piston rod (350) slides in a direction away from the piston cylinder (340), it can be connected to the first pipe (222), the second pipe (232) and the third pipe (242) in sequence.

8. The performance testing device for a cable protection tube according to claim 7, characterized in that: The box (100) is filled with water, and a plurality of rectangular tubes (300) are connected to the side wall of the box (100). A rectangular plate (310) is slidably connected to each of the plurality of rectangular tubes (300), and a spring (330) is connected between the rectangular plate (310) and the end of the rectangular tube (300); A detection rod (320) is fixedly connected to the rectangular plate (310), and a displacement sensor is provided on the detection rod (320). When the detection protective tube is damaged, the spring (330) applies pressure to the rectangular plate (310) so that water in the box (100) flows into the detection protective tube. When the damage degree of the detection protective tube is high, the sliding speed of the detection rod (320) is fast.

9. The performance testing device for a cable protection tube according to claim 8, characterized in that: A bracket (390) is fixedly connected to the rectangular tube (300), and a control rod (360) is fixedly connected to the bracket (390). The end of the control rod (360) is fixedly connected to the piston rod (350). Anti-slip grooves are provided on the control rod (360) and the plurality of detection rods (320). A groove (361) is provided on the lower surface of the control rod (360). When the control rod (360) drives the piston rod (350) to slide synchronously, the groove (361) can be located in sequence on the upper parts of the plurality of detection rods (320), so that the corresponding detection rods (320) are unlocked.

10. The performance testing device for a cable protection tube according to claim 9, characterized in that: The bracket (390) is fixedly connected to a motor (380), an output end of the motor (380) is fixedly connected to a gear (370), and the control rod (360) is provided with teeth meshing with the gear (370).

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