A device and method for testing the axial tensile strength of a cable protection tube

Abstract

The application relates to the technical field of cable testing equipment, and discloses a cable protection pipe axial tensile degree testing device and a testing method, which comprises a mounting base, the top of the mounting base is fixedly connected with a rack, the inner side of the rack is provided with a movable cross beam, the movable cross beam can move on the inner side of the rack, one side of the mounting base and the movable cross beam is provided with a mounting and fixing mechanism, one side of the mounting and fixing mechanism is provided with a flexible clamping mechanism, the mounting and fixing mechanism is convenient for replacing the flexible clamping mechanism, and the flexible clamping mechanism is used for flexibly clamping the cable protection pipe. The flexible clamping is realized through the air pressure supply mechanism and the flexible clamping mechanism, the clamping end is prevented from being damaged, the inner and outer extrusion air bags can be used to improve the stability of clamping, cable protection pipe sample sliding is avoided, the end of the cable protection pipe is prevented from being damaged, therefore, accurate values can be tested, and the testing precision is improved.

Description

Technical Field

[0001] This invention relates to the field of cable testing equipment technology, specifically to a test device and method for testing the axial tensile strength of cable protection pipes. Background Technology

[0002] Cable protection conduits are made of various materials, including metals, plastics, and fiberglass reinforced plastics, and are used to protect cables from mechanical damage and chemical corrosion. The axial tensile strength testing device for cable protection conduits is a key piece of equipment for testing their tensile properties. Through stable support by a frame, a loading system applies tensile force, and a clamping device stabilizes the sample. Combined with a force and displacement measurement system to accurately collect data, this device can accurately assess the strength, toughness, and other properties of the cable protection conduit under axial tensile force, providing a basis for quality control and material selection.

[0003] The clamping device used in the existing cable protection pipe axial tensile test device is generally a rigid clamp. This clamping structure is prone to sample slippage or damage to the clamping end. Therefore, when the cable protection pipe is stretched, the damaged clamping end is likely to cause the cable protection pipe to break prematurely during the test, resulting in inaccurate values ​​and affecting the test accuracy. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a cable protection pipe axial tensile strength testing device and method, which solves the problem that the clamping device used in existing cable protection pipe axial tensile strength testing devices is generally rigid, which leads to damage to the clamping end of the cable protection pipe, causing premature breakage during the tensile process, resulting in inaccurate test values ​​and affecting test accuracy.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an axial tensile strength testing device for cable protection pipes, comprising a mounting base, a frame fixedly connected to the top of the mounting base, a movable crossbeam provided on the inner side of the frame, the movable crossbeam being movable within the frame, a mounting and fixing mechanism provided on one side of both the mounting base and the movable crossbeam, a flexible clamping mechanism provided on one side of the mounting and fixing mechanism, the mounting and fixing mechanism facilitating replacement of the flexible clamping mechanism, the flexible clamping mechanism being used for flexibly clamping the cable protection pipe, a rigid clamping mechanism being provided inside the flexible clamping mechanism, the rigid clamping mechanism being used for rigidly clamping the cable protection pipe, and a pneumatic supply mechanism provided on the top of the frame, the pneumatic supply mechanism being used to provide gas to the flexible clamping mechanism and the rigid clamping mechanism.

[0006] Preferably, the mounting and fixing mechanism includes two mounting seats, which are respectively fixedly connected to the top of the mounting base and the bottom of the movable crossbeam. A fixing column is fixedly connected to one side of each mounting seat, a fixing ring is fixedly connected to the outside of the fixing column, an installation groove is provided inside the fixing column, a sliding blocking sleeve is slidably connected to the outside of the fixing column, a push spring is sleeved on the outside of the fixing column, and an installation card is provided inside the installation groove.

[0007] Preferably, the flexible clamping mechanism includes a mounting cylinder, the side of which is fixedly connected to one side of the mounting base near the mounting fixing mechanism. A ventilation groove is formed inside the side of the mounting cylinder near the mounting base. Multiple ventilation channels are formed inside the mounting cylinder. An outer compression airbag is fixedly connected to the top inner side of the mounting cylinder. A ventilation column is fixedly connected to the middle inner side of the mounting cylinder. An inner compression airbag is fixedly connected to the top outer end of the ventilation column. Multiple gas holes are formed on the inner wall of the top end of the ventilation column. An air inlet pipe is fixedly connected to the bottom of the mounting cylinder. A threaded mounting sleeve is rotatably connected to the end of the air inlet pipe away from the mounting cylinder. A connecting pipe is threaded inside one of the threaded mounting sleeves, and a ventilation hose is threaded inside the other threaded mounting sleeve. The bottom of the ventilation hose is fixedly connected to the outside of the connecting pipe.

[0008] Preferably, the rigid clamping mechanism includes multiple fixed cylinders, each fixed cylinder having a tension spring inside, a movable plug slidably connected inside the fixed cylinder, a connecting crank fixedly connected to the side of the movable plug away from the tension spring, a stop block fixedly connected to the end of the connecting crank fixedly away from the movable plug, limit plates fixedly connected to both sides of the stop block, multiple fixed plates fixedly connected to the outside of the mounting cylinder, a venting bottom pipe fixedly connected to the side of the fixed cylinder away from the connecting crank, multiple venting bottom pipes fixedly connected to the bottom outer ends of two mounting cylinders respectively away from the bottom of the fixed cylinder, and multiple rotating pressing plates rotatably connected to the inner wall of the mounting cylinder.

[0009] Preferably, the air pressure supply mechanism includes an outer cylinder, a limiting ring slidably connected inside the outer cylinder, a middle cylinder fixedly connected to the bottom of the limiting ring, a limiting ring slidably connected inside the middle cylinder, an inner cylinder fixedly connected to the bottom of the limiting ring, the bottom of the inner cylinder fixedly connected to the top of the frame, a support rod fixedly connected to the top of the inner cylinder, multiple exhaust holes opened at the bottom of the outer cylinder, multiple air outlet holes opened at the bottom of the outer cylinder, two one-way valves fixedly connected to the top of the outer cylinder, a connecting hose fixedly connected to the top of one of the one-way valves, an air tank fixedly connected to the outside of the mounting base, two automatic valves fixedly connected to the top of the air tank, an exhaust valve fixedly connected to the outside of the automatic valves, the bottom of the connecting hose fixedly connected to the top of one of the automatic valves, and the bottom of the connecting hose fixedly connected to the top of the other automatic valve.

[0010] Preferably, one end of the push spring is fixedly connected to one side of the sliding stop sleeve, and the other end of the push spring is fixedly connected to the side of the fixing ring away from the mounting base.

[0011] Preferably, one end of the tension spring is fixedly connected to the inside of the fixed cylinder, and the other end of the tension spring is fixedly connected to the inside of the movable plug.

[0012] Preferably, the fixed plate has a sliding groove inside, and the limiting plate is slidably connected inside the sliding groove.

[0013] Preferably, the bottom of the support rod is fixedly connected to the top of the movable crossbeam, and the support rod passes through the top of the frame.

[0014] A test method for an axial tensile strength testing device for cable protection pipes includes the following steps:

[0015] Step 1: Select a cable protection pipe sample of appropriate length, clean the surface, check for any defects in appearance, and ensure that it meets the test requirements;

[0016] Step 2: Start the frame to move the movable crossbeam up and down, and then use the air pressure supply mechanism to store gas. Place the sample from Step 1 in the flexible clamping mechanism, and use the air pressure supply mechanism to provide air pressure to the flexible clamping mechanism. Clamp the sample using the flexible clamping mechanism, calibrate the equipment, set the loading speed test parameters, and check whether the connection of each component is stable.

[0017] Step 3: Start the device and apply tension at a constant speed using the movable crossbeam. Record the force and displacement data in real time until the sample breaks. Stop the test and analyze the results.

[0018] This invention provides a device and method for testing the axial tensile strength of cable protection pipes. It has the following advantages:

[0019] 1. This invention provides air pressure through an air pressure supply mechanism and achieves flexible clamping through a flexible clamping mechanism to avoid damage to the clamping end. The air pressure supply mechanism, utilizing internal and external compression airbags, can improve the stability of the clamping and prevent slippage of the cable protection tube sample. At the same time, the rigid clamping mechanism further improves the stability of the clamping, thereby preventing slippage of the clamping end of the cable protection tube sample and avoiding damage. This prevents premature breakage during cable protection tube testing, thus enabling accurate values ​​to be obtained and improving testing precision.

[0020] 2. The present invention enables quick replacement of clamps through the installation and fixing mechanism. Since the clamps are in direct contact with the cable protection pipe during use, they will be worn after repeated clamping and need to be replaced. However, by using the installation and fixing mechanism, there is no need to use fasteners, and the clamps can be replaced quickly, thereby saving time and effort, improving installation efficiency, and reducing workload.

[0021] 3. This invention, through the cooperation of a flexible clamping mechanism and a rigid clamping mechanism, enables the cable protection pipe to be placed inside the mounting cylinder. After the airbag inflates, the cable protection pipe can be positioned in the middle of the mounting cylinder, ensuring that the cable protection pipe remains vertical during axial tension and does not tilt. This ensures that the tensile force is uniformly transmitted along the axial direction, preventing local stress concentration that could lead to premature sample breakage or distorted test data. Consequently, it ensures accurate force and displacement measurements and reduces test errors. Attached Figure Description

[0022] Figure 1 The three-dimensional representation of the present invention Figure 1 ;

[0023] Figure 2 The three-dimensional representation of the present invention Figure 2 ;

[0024] Figure 3 This is a schematic diagram of the mounting base in this invention;

[0025] Figure 4 This is a schematic diagram of the mounting groove in the present invention;

[0026] Figure 5 This is a schematic diagram of the mounting bracket structure in this invention;

[0027] Figure 6 This is a schematic diagram of the ventilation column in this invention;

[0028] Figure 7This is a schematic diagram of the internal structure of the mounting cylinder in this invention;

[0029] Figure 8 This is a schematic diagram of the rotating extrusion plate in this invention;

[0030] Figure 9 This is a schematic diagram of the ventilation channel in this invention;

[0031] Figure 10 This is a schematic diagram of the structure of the fixing plate in this invention;

[0032] Figure 11 This is a schematic diagram of the internal structure of the fixed cylinder in this invention;

[0033] Figure 12 This is a schematic diagram of the internal structure of the outer cylinder in this invention;

[0034] Figure 13 This is a schematic diagram of the exhaust valve in this invention.

[0035] The components include: 1. Mounting base; 2. Frame; 3. Movable crossbeam; 4. Mounting and fixing mechanism; 401. Mounting seat; 402. Fixing column; 403. Fixing ring; 404. Mounting groove; 405. Sliding blocking sleeve; 406. Push spring; 407. Mounting bracket; 5. Flexible clamping mechanism; 501. Mounting cylinder; 502. Ventilation groove; 503. Ventilation channel; 504. Outer compression airbag; 505. Ventilation column; 506. Ventilation hose; 507. Gas hole; 508. Inner compression airbag; 509. Air inlet pipe; 510. Threaded mounting sleeve; 511. Connecting pipe; 6. Rigid clamping mechanism; 601, fixed cylinder; 602, tension spring; 603, movable plug; 604, connecting crank; 605, stop block; 606, limiting plate; 607, fixed plate; 608, sliding groove; 609, venting bottom pipe; 610, rotating extrusion plate; 7, air pressure supply mechanism; 701, outer cylinder; 702, limiting ring; 703, middle cylinder; 704, limiting ring; 705, inner cylinder; 706, support rod; 707, exhaust port; 708, air outlet; 709, one-way valve; 710, connecting hose; 711, air tank; 712, automatic valve; 713, exhaust valve. Detailed Implementation

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Please see the appendix Figure 1 -Appendix Figure 13 This invention provides a cable protection pipe axial tensile strength testing device, including a mounting base 1, a frame 2 fixedly connected to the top of the mounting base 1, a movable crossbeam 3 provided on the inner side of the frame 2, the movable crossbeam 3 being movable within the frame 2, a mounting and fixing mechanism 4 provided on one side of both the mounting base 1 and the movable crossbeam 3, a flexible clamping mechanism 5 provided on one side of the mounting and fixing mechanism 4, the mounting and fixing mechanism 4 facilitating the replacement of the flexible clamping mechanism 5, the flexible clamping mechanism 5 being used to flexibly clamp the cable protection pipe, a rigid clamping mechanism 6 being provided inside the flexible clamping mechanism 5, the rigid clamping mechanism 6 being used to rigidly clamp the cable protection pipe, and a pneumatic supply mechanism 7 provided on the top of the frame 2, the pneumatic supply mechanism 7 being used to provide gas to the flexible clamping mechanism 5 and the rigid clamping mechanism 6.

[0038] The mounting and fixing mechanism 4 includes two mounting seats 401, which provide mounting positions. The two mounting seats 401 are respectively fixedly connected to the top of the mounting base 1 and the bottom of the movable crossbeam 3. A fixing post 402 is fixedly connected to one side of the mounting seat 401, providing the mounting position. A fixing ring 403 is fixedly connected to the outside of the fixing post 402. A mounting groove 404 is opened inside the fixing post 402. A sliding blocking sleeve 405 is slidably connected to the outside of the fixing post 402. A push spring 406 is sleeved on the outside of the fixing post 402. A mounting bracket 407 is provided inside the mounting groove 404. The push spring 406 can push the sliding blocking sleeve 405 to reset using its own reaction force, thereby blocking it outside the mounting groove 404 and preventing the mounting bracket 407 from sliding out of the mounting groove 404. One end of the push spring 406 is fixedly connected to... One side of the sliding blocking sleeve 405 and the other end of the pushing spring 406 are fixedly connected to the side of the fixing ring 403 away from the mounting base 401. When disassembling the flexible clamping mechanism 5, first push the sliding blocking sleeve 405 towards the fixing ring 403, thereby compressing the pushing spring 406. After the fixing ring 403 moves out of the range of the mounting groove 404, pull the mounting bracket 407 out of the inside of the mounting groove 404. When installing the flexible clamping mechanism 5, slide the sliding blocking sleeve 405 out of the range of the mounting groove 404 again, then slide the mounting bracket 407 into the inside of the mounting groove 404, and release the sliding blocking sleeve 405. Under the reaction force of the pushing spring 406, the sliding blocking sleeve 405 moves away from the fixing ring 403, and the sliding blocking sleeve 405 is fitted into the mounting groove 404. At this time, the installation of the flexible clamping mechanism 5 can be completed.

[0039] The flexible clamping mechanism 5 includes a mounting cylinder 501, which provides an installation position and ventilation space. The mounting cylinder 501 is fixedly connected to one side of the mounting bracket 407 near the mounting fixing mechanism 4. A ventilation groove 502 is provided inside the mounting cylinder 501 near the mounting bracket 407, providing space for gas communication. Multiple ventilation channels 503 are provided inside the mounting cylinder 501, allowing for ventilation. An outer compression airbag 504 is fixedly connected to the top inner side of the mounting cylinder 501, inflating after ventilation. A ventilation column 505 is fixedly connected to the middle inner side of the mounting cylinder 501, allowing for ventilation. The top outer end of the ventilation column 505 is fixedly connected to... The inner compression airbag 508 has multiple gas holes 507 on the inner wall of the top of the air column 505. Gas in the air column 505 can blow air into the inner compression airbag 508 through the gas holes 507, causing the inner compression airbag 508 to inflate. An air inlet pipe 509 is fixedly connected to the bottom of the mounting cylinder 501, allowing air to pass through. A threaded mounting sleeve 510 is rotatably connected to the end of the air inlet pipe 509 away from the mounting cylinder 501. A connecting pipe 511 is threaded into the inner thread of one threaded mounting sleeve 510, and a ventilation hose 506 is threaded into the inner thread of the other threaded mounting sleeve 510. The connecting pipe 511 serves as the main ventilation pipe, and the ventilation hose 506 serves as the secondary ventilation pipe. Gas can pass through the connecting pipe 511 and then... The ventilation hose 506 splits the airflow, and since the inner and outer diameters of the pipes are the same, the airflow rates are also the same. Two threaded mounting sleeves 510 can be connected to the connecting pipe 511 and the ventilation hose 506 for easy ventilation. The bottom of the ventilation hose 506 is fixedly connected to the outside of the connecting pipe 511. Gas is supplied to the connecting pipe 511 and the ventilation hose 506 through the air pressure supply mechanism 7. After entering the threaded mounting sleeves 510 and the air inlet pipe 509, the gas enters the interior of the ventilation groove 502. The gas enters through the ventilation channel 503 and inflates the outer compression airbag 504, causing it to expand and press against the outside of the cable protection pipe. Simultaneously, the gas enters the interior of the ventilation column 505 and is released through the gas hole 507. The air is inflated, causing the inner compression airbag 508 to expand and press against the inside of the cable protection tube. This allows the cable protection tube to be squeezed and fixed by the expanded outer compression airbag 504 and inner compression airbag 508, thus achieving flexible clamping of the cable protection tube. The air supply mechanism 7, the ventilation hose 506, and the connecting pipe 511 can discharge the gas in the ventilation groove 502. The gas in the ventilation groove 502 is discharged through the ventilation hose 506 and the connecting pipe 511. Then, under the elastic action of the outer compression airbag 504 and the inner compression airbag 508, the gas is discharged through the gas hole 507 and the ventilation channel 503 into the ventilation groove 502, and then discharged through the ventilation groove 502. At this time, the cable protection tube can be taken out from the installation cylinder 501.

[0040] The rigid clamping mechanism 6 includes multiple fixed cylinders 601, which provide installation positions. A tension spring 602 is installed inside each fixed cylinder 601. A movable plug 603 is slidably connected inside the fixed cylinder 601, allowing it to slide within the fixed cylinder 601 and move under the pressure of gas. A connecting crank 604 is fixedly connected to the side of the movable plug 603 away from the tension spring 602, serving a connecting function. A stop block 605 is fixedly connected to the end of the connecting crank 604 away from the movable plug 603. Limiting plates 606 are fixedly connected to both sides of the stop block 605. Multiple fixing plates 607 are fixedly connected to the outside of the mounting cylinder 501, serving to mount the fixed cylinder 601. A vent pipe 609 is fixedly connected to the side away from the connecting crank 604. The vent pipe 609 allows for ventilation. Multiple vent pipes 609 are fixedly connected to the outer bottom ends of two mounting cylinders 501, away from the bottom of the fixed cylinder 601. Multiple rotating pressing plates 610 are rotatably connected to the inner wall of the mounting cylinder 501. When the abutment block 605 moves away from the vent pipe 609, it can drive the rotating pressing plates 610 to rotate towards the center. When the abutment block 605 moves closer to the vent pipe 609, it causes the rotating pressing plates 610 to lose the force of rotating towards the center, thereby releasing the rigid clamping force of the cable protection pipe. One end of the tension spring 602 is fixedly connected to the inside of the fixed cylinder 601, and the other end of the tension spring 602 is fixedly connected to the movable Inside the plug 603, a sliding groove 608 is formed inside the fixing plate 607. A limiting plate 606 is slidably connected inside the sliding groove 608. After the limiting plate 606 slides inside the sliding groove 608, it can maintain the stability of the sliding block 605, so that it can move up and down stably under the drive of the connecting crank 604. The gas in the venting groove 502 enters the interior of the fixing cylinder 601 through the venting bottom pipe 609, and then overcomes the tension of the tension spring 602 to push the movable plug 603 upward, thereby driving the connecting crank 604 to move upward, and then driving the block 605 to move upward. When the block 605 moves upward, the rotating pressing plate 610 can rotate in the middle, and the rotating pressing plate 610 can be used to rotate the pressing plate 610. 10. The cable protection tube is squeezed to achieve rigid clamping, which improves the stability of the cable protection tube clamping. Since the rigid clamping end is located behind the flexible clamping end, if the end of the cable protection tube at the rigid clamping end is damaged, the end at the flexible clamping end will not be damaged, thus not affecting the testing process. This improves both stability and testing accuracy. Simultaneously, when the gas in the venting groove 502 is discharged, the gas inside the fixed cylinder 601 can be discharged through the venting bottom pipe 609. At this time, under the reaction force of the tension spring 602, the movable plug 603 is pulled towards the venting bottom pipe 609, which in turn drives the connecting crank rod 604 to move towards the venting bottom pipe 609.The venting pipe 609 causes the stop block 605 to move towards the venting pipe 609, thereby releasing the force of the rotating pressing plate 610 clamping it in the middle, and thus releasing the cable protection pipe.

[0041] The air pressure supply mechanism 7 includes an outer cylinder 701. A limiting ring 702 is slidably connected inside the outer cylinder 701, serving a limiting function. A middle cylinder 703 is fixedly connected to the bottom of the limiting ring 702. The middle cylinder 703 penetrates the outer cylinder 701 and, under the limiting of the limiting ring 702, prevents the middle cylinder 703 from moving out of the outer cylinder 701. A limiting ring 704 is slidably connected inside the middle cylinder 703, also serving a limiting function. An inner cylinder 705 is fixedly connected to the bottom of the limiting ring 704. The outer cylinder 701, middle cylinder 703, and inner cylinder 705 combine to form a three-section telescopic rod, enabling gas generation. The bottom of the inner cylinder 705 is fixedly connected to the top of the frame 2, and the top of the outer cylinder 701 is fixed inside. A support rod 706 is connected, which can drive the outer cylinder 701, the middle cylinder 703, and the inner cylinder 705 to extend and retract. Multiple vent holes 707 are opened at the bottom outer end of the outer cylinder 701, and multiple air outlet holes 708 are opened at the bottom outer end of the middle cylinder 703. The vent holes 707 and air outlet holes 708 can respectively discharge the gas moving downwards through the limiting ring 702 and the limiting ring 704, thereby avoiding motion interference. Two one-way valves 709 are fixedly connected to the top of the outer cylinder 701, allowing for convenient one-way ventilation. A connecting hose 710 is fixedly connected to the top of one of the one-way valves 709, enabling connection. An air storage tank 711 is fixedly connected to the outside of the mounting base 1. The gas storage tank 711 is capable of storing gas and thus providing gas pressure. Two automatic valves 712 are fixedly connected to the top of the gas storage tank 711. An exhaust valve 713 is fixedly connected to the outside of each automatic valve 712. The bottom of a connecting hose 710 is fixedly connected to the top of one of the automatic valves 712, and the bottom end of a connecting pipe 511 is fixedly connected to the top of the other automatic valve 712. The bottom of a support rod 706 is fixedly connected to the top of a movable crossbeam 3. The support rod 706 passes through the top of the frame 2. When the movable crossbeam 3 moves upward, it can drive the support rod 706 upward, which in turn pushes the outer cylinder 701 upward. After the bottom of the outer cylinder 701 reaches the bottom of the limit ring 702, as the outer cylinder 701 continues to move upward, it can drive the limit ring 702. The retaining ring 702 and the middle cylinder 703 move upwards. Simultaneously, the one-way valve 709 with the connecting hose 710 is closed, while the other one-way valve 709 is open, allowing it to draw in gas from the outside. When the movable beam 3 moves downwards, the support rod 706 moves downwards, which in turn moves the outer cylinder 701 downwards, pushing the retaining ring 702 downwards. At this time, the one-way valve 709 with the connecting hose 710 is open, while the other one-way valve 709 is closed, and the automatic valve 712 with the connecting hose 710 is opened. The gas between the outer cylinder 701 and the retaining ring 702 then enters the gas storage tank 711 through the one-way valve 709 and the connecting hose 710.When the gas pressure in the gas tank 711 becomes too high, the vent valve 713 on the automatic valve 712, which is equipped with a connecting hose 710, is opened. This releases the gas from the gas tank 711, thus preventing excessive pressure buildup.

[0042] A test method for an axial tensile strength testing device for cable protection pipes includes the following steps:

[0043] Step 1: Select a cable protection pipe sample of appropriate length, clean the surface, check for any defects in appearance, and ensure that it meets the test requirements;

[0044] Step 2: Start the frame 2 to drive the movable crossbeam 3 to move up and down, and then use the air pressure supply mechanism 7 to store gas. Place the sample from Step 1 in the flexible clamping mechanism 5, and use the air pressure supply mechanism 7 to provide air pressure to the flexible clamping mechanism 5. Clamp the sample using the flexible clamping mechanism 5, calibrate the equipment, set the loading speed test parameters, and check whether the connection of each component is stable.

[0045] Step 3: Start the device and apply tension at a constant speed using the movable crossbeam 3. Record the force and displacement data in real time until the sample breaks. Stop the test and analyze the results.

[0046] Working principle: When disassembling the flexible clamping mechanism 5, first push the sliding blocking sleeve 405 towards the fixed ring 403, thereby compressing the push spring 406. After the fixed ring 403 moves out of the range of the mounting groove 404, pull the mounting bracket 407 out of the inside of the mounting groove 404. When installing the flexible clamping mechanism 5, slide the sliding blocking sleeve 405 out of the range of the mounting groove 404, then slide the mounting bracket 407 into the inside of the mounting groove 404, and release the sliding blocking sleeve 405. Under the reaction force of the push spring 406, the sliding blocking sleeve 405 moves away from the fixed ring 403, so that the sliding blocking sleeve 405 is fitted into the mounting groove 404. At this time, the installation of the flexible clamping mechanism 5 can be completed.

[0047] Gas is supplied through the air pressure supply mechanism 7 to the connecting pipe 511 and the air hose 506. After entering the threaded mounting sleeve 510 and the air inlet pipe 509, the gas enters the interior of the air groove 502. The gas enters through the air passage 503 and inflates the outer compression airbag 504, causing it to expand and press against the outside of the cable protection pipe. At the same time, gas enters the interior of the air column 505 and is inflated through the gas hole 507, causing the inner compression airbag 508 to expand and press against the inside of the cable protection pipe. This allows the inflated outer compression airbag to press against the inside of the cable protection pipe. The air bladder 504 and the inner squeezing air bladder 508 squeeze and fix the cable protection tube, thereby completing the flexible clamping of the cable protection tube. The exhaust valve 713 on the automatic valve 712 connected to the connecting pipe 511 is opened, and the gas in the ventilation groove 502 is discharged through the ventilation hose 506 and the connecting pipe 511. Then, under the elastic action of the outer squeezing air bladder 504 and the inner squeezing air bladder 508, the gas is discharged through the gas hole 507 and the ventilation channel 503 into the ventilation groove 502. After being discharged through the ventilation groove 502, the cable protection tube can be taken out from the installation cylinder 501.

[0048] The gas in the venting groove 502 enters the interior of the fixed cylinder 601 through the venting bottom pipe 609, thereby overcoming the tension of the tension spring 602 and pushing the movable plug 603 upward. This causes the connecting crank rod 604 to move upward, which in turn causes the abutment block 605 to move upward. When the abutment block 605 moves upward, the rotating pressing plate 610 rotates towards the center, and the rotating pressing plate 610 presses the cable protection pipe, thereby achieving rigid clamping. At the same time, when the venting groove 502... When the gas in 02 is discharged, the gas inside the fixed cylinder 601 can be discharged through the vent pipe 609. At this time, under the reaction force of the tension spring 602, the movable plug 603 is pulled towards the vent pipe 609, which in turn drives the connecting crank 604 to move towards the vent pipe 609. Through the vent pipe 609, the abutment 605 is driven to move towards the vent pipe 609, which then loses the force of the rotating pressing plate 610 clamping in the middle, and the cable protection tube can be released.

[0049] When the movable crossbeam 3 moves upward, it drives the support rod 706 upward, which in turn pushes the outer cylinder 701 upward. Once the bottom of the outer cylinder 701 reaches the bottom of the limit ring 702, further upward movement of the outer cylinder 701 drives the limit ring 702 and the middle cylinder 703 upward. Simultaneously, the one-way valve 709 with the connecting hose 710 is closed, while the other one-way valve 709 is open, allowing it to draw in gas from the outside. When the movable crossbeam 3 moves downward, the support rod 706 moves downward, which in turn drives the outer cylinder... 701 moves downward, thereby pushing the limit ring 702 downward. At this time, the one-way valve 709 with the connecting hose 710 is in the open state, while the other one-way valve 709 is in the closed state, and the automatic valve 712 with the connecting hose 710 is opened. At this time, the gas between the outer cylinder 701 and the limit ring 702 will enter the gas storage tank 711 through the one-way valve 709 and the connecting hose 710. When the gas pressure in the gas storage tank 711 is too high, the exhaust valve 713 on the automatic valve 712 with the connecting hose 710 is opened, and the gas in the gas storage tank 711 is discharged, thereby preventing the gas pressure in the gas storage tank 711 from becoming too high.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for testing the axial elongation of a cable protection pipe, comprising a mounting base (1), characterised in that, The top of mounting base (1) is fixedly connected with rack (2), the inner side of rack (2) is provided with movable cross beam (3), movable cross beam (3) can move in the inner side of rack (2), one side of mounting base (1) and movable cross beam (3) is provided with mounting and fixing mechanism (4), one side of mounting and fixing mechanism (4) is provided with flexible clamping mechanism (5), mounting and fixing mechanism (4) is convenient to replace flexible clamping mechanism (5), flexible clamping mechanism (5) is used for flexible clamping cable protection tube, the inside of flexible clamping mechanism (5) is provided with rigid clamping mechanism (6), rigid clamping mechanism (6) is used for rigid clamping cable protection tube, the top of rack (2) is provided with air pressure supply mechanism (7), air pressure supply mechanism (7) is used for providing gas for flexible clamping mechanism (5) and rigid clamping mechanism (6), mounting and fixing mechanism (4) includes two mounting seats (401), two mounting seats (401) are fixedly connected at the top of mounting base (1) and the bottom of movable cross beam (3) respectively, one side of mounting seat (401) is fixedly connected with fixed column (402), the outside of fixed column (402) is fixedly connected with fixed ring (403), the inside of fixed column (402) is provided with installation groove (404), the outside of fixed column (402) is slidably connected with sliding block (405), the outside of fixed column (402) is provided with push spring (406), the inside of installation groove (404) is provided with mounting clamping seat (407), flexible clamping mechanism (5) includes installation cylinder (501), one side of installation cylinder (501) is fixedly connected with one side of mounting clamping seat (407) near mounting and fixing mechanism (4), the inside of one side of installation cylinder (501) near mounting clamping seat (407) is provided with air passage (502), the inside of installation cylinder (501) is provided with multiple air passages (503), the inner side top of installation cylinder (501) is fixedly connected with outside extrusion air bag (504), the inner side middle of installation cylinder (501) is fixedly connected with air passage column (505), the outside top of air passage column (505) is fixedly connected with inside extrusion air bag (508), the top inner wall of air passage column (505) is provided with multiple gas holes (507), the bottom of installation cylinder (501) is fixedly connected with air inlet pipe (509), one end of air inlet pipe (509) away from installation cylinder (501) is rotatably connected with threaded mounting sleeve (510), the inside of one threaded mounting sleeve (510) is threadedly connected with connecting pipe (511), the inside of another threaded mounting sleeve (510) is threadedly connected with air passage hose (506), the bottom of air passage hose (506) is fixedly connected with the outside of connecting pipe (511), rigid clamping mechanism (6) includes multiple fixed cylinders (601), the inside of fixed cylinder (601) is provided with tension spring (602),The inside of the fixed cylinder (601) is slidably connected with a movable plug (603), one side of the movable plug (603) away from the tension spring (602) is fixedly connected with a connecting crank rod (604), one end of the connecting crank rod (604) away from the movable plug (603) is fixedly connected with an abutting block (605), both sides of the abutting block (605) are fixedly connected with limiting plates (606), the outside of the mounting cylinder (501) is fixedly connected with a plurality of fixed plates (607), one side of the fixed cylinder (601) away from the connecting crank rod (604) is fixedly connected with air-vent bottom pipes (609), the bottoms of a plurality of the air-vent bottom pipes (609) away from the fixed cylinder (601) are respectively fixedly connected with the outside bottom ends of two the mounting cylinders (501), and the inner wall of the mounting cylinder (501) is rotatably connected with a plurality of rotating extrusion plates (610).

2. The axial tensile testing apparatus for cable protection pipes according to claim 1, characterized in that, The air pressure supply mechanism (7) includes an outer cylinder (701), the inside of the outer cylinder (701) is slidably connected with a limiting ring (702), the bottom of the limiting ring (702) is fixedly connected with a middle layer cylinder (703), the inside of the middle layer cylinder (703) is slidably connected with a limiting ring (704), the bottom of the limiting ring (704) is fixedly connected with an inner layer cylinder (705), the bottom of the inner layer cylinder (705) is fixedly connected to the top of the rack (2), the inside top end of the outer cylinder (701) is fixedly connected with a support rod (706), a plurality of exhaust holes (707) are formed in the bottom of the outer cylinder (701), a plurality of air outlet holes (708) are formed in the bottom of the middle layer cylinder (703), the top of the outer cylinder (701) is fixedly connected with two one-way valves (709), the top of one of the one-way valves (709) is fixedly connected with a connecting hose (710), the outside of the mounting base (1) is fixedly connected with a gas storage tank (711), the top of the gas storage tank (711) is fixedly connected with two automatic valves (712), the outside of the automatic valve (712) is fixedly connected with an exhaust valve (713), the bottom of the connecting hose (710) is fixedly connected to the top of one of the automatic valves (712), and the bottom end of the connecting pipe (511) is fixedly connected to the top of the other automatic valve (712).

3. The axial tensile testing device of claim 1, wherein, One end of the push spring (406) is fixedly connected to one side of the sliding blocking sleeve (405), and the other end of the push spring (406) is fixedly connected to the side, away from the mounting seat (401), of the fixed ring (403).

4. The axial tensile testing apparatus for cable protection pipes according to claim 1, characterized in that, One end of the pull spring (602) is fixedly connected to the inside of the fixed cylinder (601), and the other end of the pull spring (602) is fixedly connected to the inside of the movable plug (603).

5. The axial tensile testing apparatus for cable protection pipes according to claim 1, characterized in that, The inside of the fixed plate (607) is provided with a sliding groove (608), and the limiting plate (606) is slidably connected in the sliding groove (608).

6. The axial tensile testing apparatus for cable protection pipes according to claim 2, characterized in that, The bottom of the support rod (706) is fixedly connected to the top of the movable cross beam (3), and the support rod (706) penetrates through the top of the rack (2).

7. A test method for a cable protection pipe axial elongation test device according to claim 1, characterized in that, The method comprises the following steps: Step one: select a cable protection pipe sample of appropriate length, clean the surface, check for defects in appearance, and ensure that it meets the test requirements; Step two: start the rack (2) to drive the movable cross beam (3) to move up and down, then store gas by using the air pressure supply mechanism (7), place the sample in step one in the flexible clamping mechanism (5), provide air pressure for the flexible clamping mechanism (5) by using the air pressure supply mechanism (7), clamp the sample by using the flexible clamping mechanism (5), calibrate the equipment, set the loading speed test parameters, and check whether the components are firmly connected; Step three: start the device, use the movable cross beam (3) to load the tension at a constant speed, record the force value and displacement data in real time, until the sample breaks, stop the test and analyze the results.

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