Coal mine flame-retardant cable performance test system and method

Abstract

The invention discloses a system and a method for testing the performance of a flame-retardant cable for a coal mine, belongs to the technical field of cable flame-retardant performance testing, and aims to solve the problems that cables are tedious to fix, carbonization height measurement is inaccurate, and flame-retardant test results are affected by interference existing in combustion of the cables. The performance test system for the flame-retardant cable for the coal mine comprises a flame-retardant test box, a combustor is installed in the flame-retardant test box, a controller is fixed to the side wall of the flame-retardant test box, a jacking frame is arranged in the flame-retardant test box in a lifting sliding mode, a rotating rod is rotationally connected into the flame-retardant test box, and the rotating rod is connected with the controller. A driving machine is fixedly connected to the side wall of the flame-retardant testing box, a rotating rod is fixedly sleeved with a testing frame, a fixing column is fixed to the testing frame, a plurality of sliding columns are slidably connected to the testing frame, and clamping seats are fixedly connected to the bottom surfaces of the sliding columns. And the test result is accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of cable flame retardancy performance testing, and specifically to a performance testing system and method for flame retardant cables used in coal mines. Background Technique

[0002] In the coal mining industry, the performance of flame retardant cables is directly related to the safety and stability of coal mine production. With the continuous development of coal mining technology and the increasing requirements for safe production, the performance testing of flame retardant cables used in coal mines has become increasingly important.

[0003] In the current flame retardancy test of flame retardant cables used in coal mines, the commonly used test method is to first fix the cable, and then use a burner to perform a combustion operation on it. After the combustion is completed, a rangefinder is used to measure the carbonization height of the cable, which is used as the basis for evaluating the flame retardancy performance of the cable.

[0004] However, in the prior art, when fixing the cable, most of the time it is the staff who perform complex positioning and individual tying and fixing, which not only consumes a lot of time and energy, but also increases the labor intensity. When using a rangefinder to measure the carbonization height of the cable, since the cable may break during the combustion process, it is difficult to accurately measure the carbonization height of these broken parts, resulting in deviation of the test results and being unable to truly and accurately reflect the actual flame retardancy performance of the cable. Moreover, during the test process, the test stand may have an angular deviation due to various reasons such as mechanical vibration and wear caused by long-term use. Once the angle of the test stand deviates, it will directly affect the horizontal state of measuring devices such as infrared rangefinders, resulting in measurement errors and making it difficult to ensure the accuracy of the measurement results. And when synchronously testing multiple cables, it is impossible to effectively avoid the interference of the residual fire of other burning cables on the cable being tested. These residual fires may continue to burn the cable being tested, resulting in the measured carbonization height not being able to truly reflect the flame retardancy performance of the cable itself, reducing the credibility of the test results and being unable to provide a reliable reference basis for the actual application of the cable.

[0005] In view of the above problems, a performance testing system and method for flame retardant cables used in coal mines are proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide a performance testing system and method for flame retardant cables used in coal mines. By using the present invention for work, the problems of cumbersome cable fixing, inaccurate measurement of carbonization height, and interference between cables during combustion affecting the flame retardancy test results in the above background are solved.

[0007] To achieve the above object, the present invention provides the following technical solution: A performance testing system for a flame-retardant cable used in coal mines, including a flame-retardant test box, a burner is installed in the flame-retardant test box, a controller is fixed on the side wall of the flame-retardant test box, a lifting frame slides up and down in the flame-retardant test box, an auxiliary plate is clamped and installed on the lifting frame, a cable body is clamped in the auxiliary plate, a rotating rod is rotatably connected in the flame-retardant test box, a driving machine is fixed on the side wall of the flame-retardant test box, an output end of the driving machine is fixedly connected to the rotating rod, a test frame is fixedly sleeved on the rotating rod, a fixed column is fixed on the test frame, a plurality of sliding columns are slidably connected on the test frame, and clamping seats are fixedly connected to bottom surfaces of the plurality of sliding columns; It further includes: A feeding component, which facilitates feeding the cable body; An adjusting component, which facilitates driving the plurality of sliding columns to synchronously slide and adjust the distance; A testing component, which facilitates measuring the carbonization height of the cable body after the flame-retardant test; A calibration component, which facilitates calibrating the test frame; A clamping component, which facilitates clamping and fixing the cable body.

[0008] Further, the feeding component includes: Notches, which are opened on opposite side walls of the flame-retardant test box, an electric telescopic column is fixedly connected to the side wall of the flame-retardant test box, a slider is fixedly connected to an output end of the electric telescopic column, and the slider is slidably connected to the notch.

[0009] Further, the adjusting component includes: A fixed block, which is fixedly connected to the side wall of the fixed column, a first motor is fixedly connected to the side wall of the fixed block, a threaded rod is fixedly connected to an output end of the first motor, a connecting block is threadedly sleeved on the threaded rod, the connecting block is fixedly connected to the sliding column close to the side wall of the flame-retardant test box, convex rods are fixedly connected to both the sliding column and the side wall of the fixed column, a scissor-type connecting rod is hingedly connected between the plurality of convex rods, and a plurality of telescopic partition plates are hingedly installed at a lower hinge of the scissor-type connecting rod.

[0010] Further, there are two groups of the testing components, and the testing component includes: A fixed seat, which is fixed on the inner wall of the flame-retardant test box, a lead screw is rotatably connected in the fixed seat, a second motor is fixedly connected to the side wall of the flame-retardant test box, an output end of the second motor is fixedly connected to the lead screw, a sliding seat is threadedly connected to the lead screw, and an infrared distance measuring instrument is fixedly installed on the surface of the sliding seat.

[0011] Further, the calibration component includes: Connecting frame, the connecting frame is fixedly connected to the top surface of the fixed seat, a receiving column is fixedly connected to the end of the connecting frame, a cavity is provided in the receiving column, a spring is fixedly connected in the receiving column, the other end of the spring is fixedly connected with a rubber abutting rod, a abutting block is fixedly connected to the side wall of the sliding column, and the rubber abutting rod is in contact with the abutting block.

[0012] Further, the clamping assembly includes: Special-shaped frame, the special-shaped frame is fixed on the side walls of two sliding columns on opposite sides, a third motor is fixedly connected to one end of the side wall of the special-shaped frame, a rotating rod is fixedly connected to the output end of the third motor, a double-headed screw is clamped on the rotating rod, sliding blocks are symmetrically threadedly installed on the double-headed screw, an L-shaped frame is fixedly connected to the sliding block, a clamping plate is fixedly connected to the end of the L-shaped frame, and a strip sensor is fixedly installed on the inner wall of the clamping seat.

[0013] Further, two sliding blocks, L-shaped frames and clamping plates are symmetrically arranged about the axis of the clamping seat, and the inner walls of the two clamping plates are clamped and attached to the outer wall of the cable body.

[0014] Further, the double-headed screw is provided corresponding to the number of clamping seats.

[0015] Further, the controller is electrically connected to the burner, the drive motor, the first motor, the second motor, the third motor, the infrared rangefinder and the strip sensor.

[0016] The present invention also proposes another technical solution: a test method applied to a performance test system for a flame-retardant cable for coal mines, including the following steps: S1: Cable spacing adjustment, controlling multiple sliding columns to drive the clamping seat to move horizontally synchronously through the adjustment component, and then adjusting the spacing between them to adapt to the cable specifications. At the same time, multiple telescopic partition plates synchronously expand and contract as the sliding columns adjust the spacing and are in a suitable position; S2: Cable feeding, after the staff makes a preliminary arrangement of the cable body adaptively, the cable body is moved to a specified position through the feeding component, and the cable body is fed into the clamping seat, realizing the rapid feeding of the cable body; S3: Cable fixing, when the cable body enters the clamping seat, start the third motor to drive the rotating rod to drive multiple double-headed screws to rotate, so that two sliding blocks, L-shaped frames and clamping plates on the double-headed screw move symmetrically and towards each other, and then clamp the cable body, realizing the synchronous clamping and fixing of multiple groups of cable bodies; S4: Cable flame retardancy test. Start the burner to generate a stable flame and conduct a combustion test on the cable body. During the test, drive the rotating rod to rotate by starting the drive motor, so that the test frame on the rotating rod rotates, in order to simulate the cable flame retardancy under different angles and more comprehensively test the flame retardancy performance of the cable; S5: Measurement of the carbonization height of the cable. Drive the screw rod to rotate through the second motor to drive the slide on its outside to move horizontally. The infrared rangefinder moves horizontally synchronously to precisely measure the height of the cable body that has not yet burned and the vertical height between the cable body and the bottom surface of the flame retardancy test box for preliminary measurement; S6: Measurement correction. Start the drive motor to drive the rotating rod and the test frame to rotate, and judge whether the test frame and the contact block are in a vertical state through the extrusion distance between the contact block and the rubber contact rod, ensuring that the infrared rangefinder and the test frame are in an absolutely horizontal ideal state to avoid the influence of the angle difference on the measurement accuracy; S7: Measurement and calculation of the carbonization height of the cable. Drive the slide and the infrared rangefinder on its surface to move horizontally again. The infrared rangefinder measures the carbonization height of the cable body after combustion. The controller precisely calculates the initial recorded cable body height data and the current measured residual height data to obtain the carbonization height of the cable body; S8: Generation of measurement data. The controller collects various data during the test in real time, such as temperature, time, the combustion situation of the cable, etc., and conducts analysis and processing, and finally generates a test report, so as to facilitate the staff to view the flame retardancy test data and evaluate the performance of the flame retardant cable for coal mines.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention is simple to operate and does not require a complex positioning process, saving the work process. The feeding component can accurately send the cable to the specified position for fixing, saving the labor intensity of the staff; using the infrared rangefinder to measure the carbonization height of the cable body before and after combustion, and the controller precisely calculates the initial height data and the residual height data, effectively avoiding the problem that it is difficult to measure the burned and broken part of the cable, improving the accuracy of the test results, and making the obtained carbonization height data more able to truly reflect the flame retardancy performance of the cable; through the combined use of the test component and the correction component, the skewing problem of the test frame can be quickly and effectively corrected, ensuring that it is always in the correct position, providing a reliable basic guarantee for subsequent precise measurement; through the adjustment component, the test environment can be flexibly adjusted according to the specifications of different cables, enabling the test system to adapt to the test requirements of a variety of flame retardant cables for coal mines. And during the flame retardancy test, the telescopic fire barrier can always be adjusted to be in a suitable position to form a barrier to prevent the remaining fire of the cable that is still burning during combustion from spreading to the carbonized cable, effectively avoiding the interference of the remaining fire and making the test results more accurate. Brief Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of the feeding component of the present invention; Figure 3 It is a schematic diagram of the installation structure of the auxiliary plate and the cable body of the present invention; Figure 4 It is a schematic diagram of the internal structure of the flame retardant test box of the present invention; Figure 5 It is a schematic diagram of the structure of the adjusting component and the clamping component of the present invention; Figure 6 It is a schematic diagram of the structure of the clamping component of the present invention; Figure 7 It is a schematic diagram of the structure of the test component and the calibration component of the present invention; Figure 8 It is a schematic diagram of the structure of the calibration component of the present invention.

[0019] In the figure: 1, flame retardant test box; 2, burner; 3, controller; 4, notch; 5, lifting frame; 51, electric telescopic column; 52, slider; 6, auxiliary plate; 7, cable body; 8, rotating rod; 81, driving machine; 9, test frame; 10, fixed column; 11, sliding column; 12, adjusting component; 121, fixed block; 122, first motor; 123, threaded rod; 124, connecting block; 125, convex rod; 126, scissor link; 127, telescopic partition plate; 13, test component; 131, fixed seat; 132, lead screw; 133, second motor; 134, sliding seat; 135, infrared rangefinder; 136, calibration component; 361, connecting frame; 362, receiving column; 363, spring; 364, rubber abutting rod; 365, abutting block; 14, clamping seat; 15, clamping component; 151, special-shaped frame; 152, third motor; 153, rotating rod; 154, double-headed screw; 155, sliding block; 156, L-shaped frame; 157, clamping plate; 158, sheet sensor. Detailed Description of the Invention

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] In order to solve the technical problem that when testing cables, it is necessary for workers to tie and feed the cables one by one, as Figure 1 - Figure 8As shown in the figure, the following preferred technical solutions are provided: A performance testing system for flame-retardant cables used in coal mines, including a flame-retardant testing box 1. A burner 2 is installed inside the flame-retardant testing box 1. The flame-retardant testing box 1 provides a closed space environment for the cable during the flame-retardant test. Through the flame-retardant testing box 1, it can effectively prevent the spread of flames, smoke, etc. generated during the combustion process, ensuring the safety of the test personnel and the stability of the test environment. The burner 2 can generate a stable flame, and parameters such as the temperature and intensity of its flame can be adjusted through a controller 3 to meet different test standards and requirements. Moreover, the spray gun on the burner 2 can be adjusted in height to ensure that the flame can act uniformly on the cable body 7, thereby accurately testing the flame-retardant performance of the cable.

[0022] A controller 3 is fixed on the side wall of the flame-retardant testing box 1. The controller 3 integrates various control circuits and software programs, and can precisely control the working state of the burner 2, the rotation speed of the drive motor 81, the telescoping of the electric telescopic column 51, etc. At the same time, the controller 3 can also collect various data during the test process in real time, such as temperature, time, the combustion situation of the cable, etc., and conduct analysis and processing, and finally generate a test report for the staff to view the flame-retardant test data. A jacking frame 5 is slidably lifted inside the flame-retardant testing box 1. An auxiliary plate 6 is clamped and installed on the jacking frame 5. The auxiliary plate 6 is composed of two clamping plates with grooves. The design of the grooves can play a preliminary positioning and arranging role for the cable, and the spacing of the grooves can be adjusted adaptively according to the adjusted spacing of the cable, making the cable more regular when placed. The staff only needs to arrange the cable during the test, saving the work process. Since the auxiliary plate 6 is for assisting in loading and belongs to well-known technology, it will not be elaborated here. A cable body 7 is clamped inside the auxiliary plate 6. A rotating rod 8 is rotatably connected inside the flame-retardant testing box 1. A drive motor 81 is fixedly connected to the side wall of the flame-retardant testing box 1. The output end of the drive motor 81 is fixedly connected to the rotating rod 8. The rotating rod 8 is driven to rotate by the drive motor 81. A test frame 9 is fixedly sleeved on the rotating rod 8. A fixed column 10 is fixed on the test frame 9. The rotation of the rotating rod 8 can drive the test frame 9 fixed on it to rotate together, thereby realizing multi-angle testing of the cable body 7. During the flame-retardant test, the cable can be evenly burned by the flame by rotating the test frame 9, improving the accuracy and reliability of the test results. A plurality of sliding columns 11 are slidably connected to the test frame 9. The bottom surfaces of the plurality of sliding columns 11 are all fixedly connected with clamping seats 14. The spacing of the clamping seats 14 that can clamp the cable body 7 can be adjusted by synchronously moving the plurality of sliding columns 11 on the test frame 9, avoiding the interference of residual fire between the cables during the subsequent combustion test and thus affecting the test effect.

[0023] A performance testing system for a flame-retardant cable used in coal mines further includes a feeding component and a clamping component 15. The feeding component facilitates the feeding of the cable body 7, and the clamping component 15 facilitates the clamping and fixing of the cable body 7. The feeding component includes a notch 4, which is opened on the side walls of the two opposite sides of the flame-retardant test box 1. The notch 4 provides guidance and space for the sliding of the slider 52. The size and shape of the notch 4 match those of the slider 52 to ensure that the slider 52 will not deviate or get stuck during the sliding process. An electric telescopic column 51 is fixedly connected to the side wall of the flame-retardant test box 1, and the output end of the electric telescopic column 51 is fixedly connected to a slider 52, which is slidably connected to the notch 4. The electric telescopic column 51 drives the slider 52 to slide in the notch 4 through its telescopic action. When it is necessary to feed the cable body 7, the electric telescopic column 51 extends, pushing the slider 52 to drive the cable body 7 installed through the auxiliary plate 6 to move into the clamping seat 14, so as to send the cable body 7 to a specified position in the test box for clamping and fixing.

[0024] The clamping component 15 includes a special-shaped frame 151, which is fixed on the side walls of two sliding columns 11 on the opposite sides, playing a role of connection and support. A third motor 152 is fixedly connected to the side wall of one end of the special-shaped frame 151, and the output end of the third motor 152 is fixedly connected to a rotating rod 153. A double-headed screw rod 154 is clamped on the rotating rod 153. It should be noted that a clamping strip is installed on the outer wall of the rotating rod 153, and a clamping groove matching it is provided on the inner wall of the double-headed screw rod 154 for clamping installation, so that the double-headed screw rod 154 can move adaptively when the distance between the sliding columns 11 is adjusted, avoiding the stability problem in dealing with subsequent distance adjustments. Symmetrically threaded sliding blocks 155 are installed on the double-headed screw rod 154, so that the two sliding blocks 155 can move symmetrically towards or away from each other on its surface, thereby realizing the clamping and loosening operations of the cable body 7. An L-shaped frame 156 is fixedly connected to the sliding block 155, and a clamping plate 157 is fixedly connected to the end of the L-shaped frame 156. A sheet sensor 158 is fixedly installed on the inner wall of the clamping seat 14. The model of the sheet sensor 158 is E3Z-LS63. This sensor uses the principle of opposed or diffuse reflection for sensing. When the cable enters the clamping seat 14, the sensor can detect the signal change, thereby judging whether the cable is in place, being able to quickly and accurately sense the entry of the cable. And the bottom of the clamping seat 14 is provided in a flared shape, making it more convenient and accurate to push the cable into the clamping seat 14 for clamping and fixing during feeding. There are two sets of the sliding block 155, the L-shaped frame 156 and the clamping plate 157 symmetrically arranged about the axis of the clamping seat 14. The inner walls of the two clamping plates 157 are clamped and fitted with the outer wall of the cable body 7. The double-headed screw rod 154 is provided corresponding to the number of clamping seats 14. The inner wall of the clamping plate 157 has anti-slip and wear-resistant properties, which can ensure that the cable body 7 will not slide during the test. At the same time, the material of the clamping plate 157 is selected to have high-temperature resistance to adapt to the test environment.

[0025] Specifically, when conducting a flame retardancy test on a cable, first, the staff places the cable on the auxiliary plate 6 formed by two clamping plates with grooves for preliminary arrangement. Subsequently, the electric telescopic column 51 is activated, and the electric telescopic column 51 starts to extend. The slider 52 connected to its output end slides in the notch 4, thereby driving the lifting frame 5 to slide down to the bottom of the box. Then, the auxiliary plate 6 with multiple cable bodies 7 placed on it is clamped into the lifting frame 5. Immediately afterwards, the electric telescopic column 51 is activated again to perform a contraction action, thereby driving the lifting frame 5 and the cable body 7 to move upward. When it moves to the designated position, the cable body 7 is sent into the clamping seat 14 for clamping and fixing. When the cable body 7 enters it, the sheet sensor 158 will sense and judge. When the cable body 7 is in place, it will transmit an electrical signal to the third motor 152. The third motor 152 immediately receives the signal and starts to drive the rotating rod 153 at its output end to drive multiple double-headed screws 154 to rotate. Under the rotation of the double-headed screws 154, the two sliding blocks 155 move symmetrically towards each other. The L-shaped frames 156 fixedly connected to the sliding blocks 155 and the clamping plates 157 at the ends also move accordingly, gradually clamping the cable body 7 tightly, so that multiple groups of cable bodies 7 are clamped and fixed synchronously, enabling the cable to be fixed and clamped quickly, realizing the synchronous clamping and fixing of multiple groups of cable bodies 7. There is no need for the staff to tie and fix them one by one, which not only greatly reduces the labor intensity of the staff but also significantly improves the work efficiency, enabling the flame retardancy test work to be carried out more quickly and efficiently.

[0026] To solve the technical problem that the cable will not be continuously burned by the remaining cable fires during the flame retardancy test, thereby affecting the accuracy of the flame retardancy test results, as Figure 4 - Figure 6 shown, the following preferred technical solutions are provided: A performance test system for a flame retardant cable for coal mines includes an adjustment assembly 12. The adjustment assembly 12 facilitates driving multiple sliding columns 11 to slide synchronously to adjust the spacing. The adjustment assembly 12 includes a fixed block 121, the fixed block 121 is fixedly connected to the side wall of the fixed column 10, a first motor 122 is fixedly connected to the side wall of the fixed block 121, a threaded rod 123 is fixedly connected to the output end of the first motor 122, a connection block 124 is threadedly sleeved on the threaded rod 123, the connection block 124 is fixedly connected to the sliding column 11 close to the side wall of the flame retardancy test box 1, and convex rods 125 are fixedly connected to both the side walls of the sliding column 11 and the fixed column 10. The convex rods 125 play a role in connection and support. A scissor-type connecting rod 126 is hingedly connected between multiple convex rods 125. The scissor-type connecting rod 126 can flexibly expand and contract when the sliding column 11 slides. When the sliding column 11 slides synchronously driven by the connection block 124, the scissor-type connecting rod 126 will expand or contract accordingly according to the change in the spacing between the sliding columns 11, thus ensuring the synchronous movement between multiple sliding columns 11.

[0027] A plurality of telescopic fire barriers 127 are hingedly installed at the lower hinge of the scissor link 126. The telescopic fire barriers 127 can effectively block the spread of the remaining fire of the other cables during the flame retardancy test of the cable, prevent the remaining fire from continuously burning the cable being tested, and thus avoid having an adverse impact on the accuracy of the flame retardancy test result. When the distance between the sliding columns 11 is adjusted, the scissor link 126 will drive the telescopic fire barriers 127 to expand and contract synchronously, ensuring that the fire barriers can always be in a suitable position to play their role in blocking the remaining fire.

[0028] Specifically, when adjusting the test environment to adapt to the cable specifications, the first motor 122 on the side wall of the fixed block 121 is started through the controller 3. The first motor 122 drives the threaded rod 123 fixedly connected thereto to rotate. According to the principle of screw drive, when the threaded rod 123 rotates, the connecting block 124 will move linearly along the thread direction on the threaded rod 123, thereby driving the sliding column 11 to slide on the test rack 9. During the sliding process of the sliding column 11, the relative positions of the convex rods 125 will change. When the sliding column 11 slides to both sides, the distance between the convex rods 125 increases, and the scissor link 126 will be gradually unfolded under the traction of the convex rods 125. When the sliding column 11 slides towards the middle, the distance between the convex rods 125 decreases, and the scissor link 126 will contract accordingly. Through this telescopic change of the scissor link 126, it is ensured that the plurality of sliding columns 11 can achieve synchronous movement, thereby achieving the purpose of adjusting the distance between the plurality of sliding columns 11.

[0029] During the flame retardancy test of the flame retardant cable for coal mines, at this time, the sliding columns 11 have been adjusted to a suitable distance. If the remaining fire occurs in other surrounding cables, the plurality of telescopic fire barriers 127 installed at the lower hinge of the scissor link 126 will play a role. Since the scissor link 126 will drive the telescopic fire barriers 127 to expand and contract synchronously when the distance between the sliding columns 11 is adjusted, the telescopic fire barriers 127 are in a suitable position at this time. These telescopic fire barriers 127 can effectively block the spread of the remaining fire of the other cables, prevent the remaining fire from continuously burning the cable being tested, avoid the remaining fire from causing additional burning effects on the cable being tested, and thus ensure the accuracy of the flame retardancy test result, enabling the test result to truly and accurately reflect the actual flame retardant performance of the flame retardant cable for coal mines.

[0030] To solve the technical problem that the test rack 9 will be deformed and skewed after long-term use, resulting in the infrared rangefinder 135 being unable to accurately measure the carbonization height of the cable during the carbonization height test after the cable is flame retarded, as Figure 7 - Figure 8 shown, the following preferred technical solutions are provided: A performance testing system for a flame-retardant cable used in coal mines includes a testing component 13 and a calibration component 136. The testing component 13 facilitates measuring the carbonization height of the cable body 7 after a flame-retardant test, and the calibration component 136 facilitates calibrating the test stand 9 to ensure the accurate position of the test stand 9, thereby guaranteeing the reliability of the test results. There are two groups of testing components 13. The testing component 13 includes a fixed seat 131, which is fixed on the inner wall of the flame-retardant test box 1. A lead screw 132 is rotatably connected inside the fixed seat 131. A second motor 133 is fixedly connected to the side wall of the flame-retardant test box 1, and the output end of the second motor 133 is fixedly connected to the lead screw 132. A sliding seat 134 is threadedly connected to the lead screw 132. An infrared distance meter 135 is fixedly installed on the surface of the sliding seat 134. The model of the infrared distance meter 135 is YHJ-200J, which is an instrument that uses infrared rays to measure distance. During the test, a beam of infrared light is emitted from the infrared distance meter 135. After this infrared light irradiates the cable body 7, it will be reflected. The reflected infrared light is focused on the CMOS sensor through a lens. According to the imaging position of the light on the sensor and the geometric structure of the instrument, the distance from the target object to the distance meter is calculated using trigonometric relationships, thereby realizing accurate measurement of the carbonization height distance.

[0031] The calibration component 136 includes a connecting frame 361, which is fixedly connected to the top surface of the fixed seat 131. A receiving column 362 is fixedly connected to the end of the connecting frame 361. A cavity is provided inside the receiving column 362, which provides space for the installation and movement of a spring 363 and a rubber contact rod 364. A spring 363 is fixedly connected inside the receiving column 362. The spring 363 has elasticity and can provide elastic force for the rubber contact rod 364. The other end of the spring 363 is fixedly connected to a rubber contact rod 364. A contact block 365 is fixedly connected to the side wall of the sliding column 11. The rubber contact rod 364 is in contact with the contact block 365. During the moving test, the rubber contact rod 364 will continuously move with the infrared distance meter 135 to contact the test stand 9. When the test stand 9 is always in a vertical state, the rubber contact rod 364 will not be compressed and changed. When it occurs, timely adjustment is made to avoid affecting the accuracy of the test results.

[0032] Specifically, when conducting a flame-retardant test on a flame-retardant cable used in coal mines, it is necessary to issue an instruction to the second motor 133 through the controller 3 to drive the lead screw 132 to rotate. As the lead screw 132 rotates, the sliding seat 134 sleeved outside it will move smoothly along the horizontal direction, and the infrared distance meter 135 installed on the surface of the sliding seat 134 will also move horizontally synchronously. During this process, the infrared distance meter 135 will accurately measure the height of the cable body 7 that has not yet burned and the vertical height between the cable body 7 and the bottom surface of the flame-retardant test box 1, and record these measurement data in detail.

[0033] During the formal test, the burner 2 is started to burn the cable body 7. During the test, the drive motor 81 can drive the rotating rod 8 to rotate again as needed, so that the test frame 9 drives the cable body 7 to rotate, simulating the cable flame retardancy at different angles, and more comprehensively testing the flame retardancy performance of the cable. By controlling the rotation of the test frame 9, the flame retardancy test situation of the cable at different angles is simulated, so as to more comprehensively and realistically reflect the flame retardancy performance of the cable in the actual use scenario.

[0034] When the test is over and the test frame 9 is not in the initial position, the system enters the calibration link. At this time, the rubber contact rod 364 in the calibration component 136 extends outward under the natural action of the spring 363. In order to ensure the accuracy of subsequent tests, it is necessary to perform a calibration operation on the test frame 9. Then the drive motor 81 is started to drive the rotating rod 8 to rotate, and then the test frame 9 rotates. When the contact block 365 on the side wall of the test frame 9 fits with the rubber contact rod 364, the contact block 365 will exert an extrusion force on the rubber contact rod 364, prompting the rubber contact rod 364 to slide a suitable distance into the receiving column 362, and accurately forming a strict 90-degree vertical state between the test frame 9 and the contact block 365, thereby ensuring that the infrared rangefinder 135 and the test frame 9 are in an absolutely horizontal ideal state.

[0035] After the calibration of the test frame 9 is completed, the second motor 133 is driven by the controller 3 to rotate the lead screw 132 again. When the lead screw 132 rotates, the slide seat 134 and the infrared rangefinder 135 on its surface will move horizontally again. At this time, the infrared rangefinder 135 measures the carbonization height of the cable body 7 after combustion. The controller 3 will accurately calculate the initial recorded height data of the cable body 7 and the current measured residual height data, so as to obtain the carbonization height of the cable body 7. Measuring in this way can effectively avoid the result deviation caused by the difficult measurement of the burned and broken part of the cable body 7 during the cable combustion process, and greatly improve the accuracy and reliability of the test results. In this ideal horizontal state, the rangefinder can greatly improve the measurement accuracy during the subsequent horizontal movement process, and effectively reduce the measurement error caused by the angle deviation.

[0036] When the contact block 365 no longer contacts the rubber contact rod 364, or when the rubber contact rod 364 is extruded excessively and slides out beyond the normal range by a certain distance, this indicates that the test stand 9 is skewed. At this time, the rangefinder will quickly perform its intelligent detection function, convert the relevant data detected by scanning into electrical signals in a timely manner, and transmit them accurately to the controller 3. After receiving this signal, the controller 3 will immediately start the drive motor 81, and the drive motor 81 will drive the rotating rod 8 to rotate, thereby realizing the fine adjustment rotation of the test stand 9. Through this automatic detection and fine adjustment mechanism, the skewness problem of the test stand 9 can be quickly and effectively corrected, ensuring that it is always in the correct position and providing a reliable basic guarantee for subsequent accurate measurement.

[0037] To better explain and illustrate the above embodiments, the present invention proposes another implementation scheme, a test method for a flame-retardant cable performance test system for coal mines, including the following steps: Step 1: Cable spacing adjustment. The adjustment component 12 controls multiple sliding columns 11 to drive the clamping seats 14 to move horizontally synchronously, thereby adjusting the spacing between them to adapt to the cable specifications. At the same time, multiple telescopic partition plates 127 will synchronously expand and contract as the sliding columns 11 adjust the spacing and be in a suitable position. Step 2: Cable feeding. After the staff preliminarily arranges the cable body 7 adaptively, they move it to the designated position through the feeding component. The cable body 7 is fed into the clamping seat 14 to achieve the rapid feeding of the cable body 7. Step 3: Cable fixing. When the cable body 7 enters the clamping seat 14, the third motor 152 is started to drive the rotating rod 153 to drive multiple double-headed screws 154 to rotate, so that the two sliding blocks 155, L-shaped frames 156 and clamping plates 157 on the double-headed screws 154 move symmetrically towards each other, thereby clamping the cable body 7 and realizing the synchronous clamping and fixing of multiple groups of cable bodies 7. Step 4: Cable flame-retardant test. The burner 2 is started, and the burner 2 generates a stable flame to conduct a combustion test on the cable body 7. During the test, the drive motor 81 is started to drive the rotating rod 8 to rotate, so that the test stand 9 on the rotating rod 8 rotates to facilitate simulating the cable flame-retardant situation at different angles and more comprehensively testing the flame-retardant performance of the cable. Step 5: Measurement of the carbonization height of the cable. The second motor 133 is used to drive the screw rod 132 to rotate, driving the sliding seat 134 outside it to move horizontally along the horizontal direction. The infrared rangefinder 135 moves horizontally synchronously to accurately measure the height of the cable body 7 that has not been burned and the vertical height between the cable body 7 and the bottom surface of the flame-retardant test box 1 for preliminary measurement. Step 6: Measurement and calibration. Start the drive motor 81 to drive the rotating rod 8 and the test stand 9 to rotate. Determine whether the test stand 9 and the abutting block 365 are in a vertical state by the extrusion distance between the abutting block 365 and the rubber abutting rod 364, ensuring that the infrared rangefinder 135 and the test stand 9 are in an ideal state of absolute horizontal, and avoiding the influence of the angle difference on the measurement accuracy. Step 7: Measurement and calculation of the carbonization height of the cable. Drive the carriage 134 and the infrared rangefinder 135 on its surface to move horizontally again. The infrared rangefinder 135 measures the carbonization height of the cable body 7 after combustion. The controller 3 accurately calculates the initial recorded height data of the cable body 7 and the currently measured residual height data to obtain the carbonization height of the cable body 7. Step 8: Generation of measurement data. The controller 3 collects various data during the test in real time, such as temperature, time, the combustion condition of the cable, etc., and analyzes and processes them. Finally, a test report is generated to facilitate the staff to view the flame retardant test data and evaluate the performance of the flame retardant cable for coal mines.

[0038] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0039] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A performance testing system for flame-retardant cables used in coal mines, including a flame-retardant test box (1), characterized in that: A burner (2) is installed inside the flame retardant test box (1), a controller (3) is fixed on the side wall of the flame retardant test box (1), a jacking frame (5) is slidably lifted inside the flame retardant test box (1), an auxiliary plate (6) is clamped and installed on the jacking frame (5), a cable body (7) is clamped inside the auxiliary plate (6), a rotating rod (8) is rotatably connected inside the flame retardant test box (1), a driving machine (81) is fixedly connected to the side wall of the flame retardant test box (1), the output end of the driving machine (81) is fixedly connected to the rotating rod (8), a test frame (9) is fixedly sleeved on the rotating rod (8), a fixing column (10) is fixed on the test frame (9), and a plurality of sliding columns (11) are slidably connected to the test frame (9). The bottom surfaces of the plurality of sliding columns (11) are all fixedly connected with clamping seats (14); It further includes: A feeding assembly for facilitating the feeding of the cable body (7); An adjusting assembly (12) for facilitating the synchronous sliding and spacing adjustment of the plurality of sliding columns (11); A testing assembly (13) for facilitating the measurement of the carbonization height of the cable body (7) after the flame retardant test; A calibration assembly (136) for facilitating the calibration of the test frame (9); A clamping assembly (15) for facilitating the clamping and fixing of the cable body (7).

2. The performance testing system for a flame-retardant cable used in coal mines according to claim 1, wherein: The feeding assembly includes: Notches (4) are opened on the opposite side walls of the flame retardant test box (1). An electric telescopic column (51) is fixedly connected to the side wall of the flame retardant test box (1), and a slider (52) is fixedly connected to the output end of the electric telescopic column (51). The slider (52) is slidably connected to the notch (4).

3. The performance testing system for a flame-retardant cable used in coal mines according to claim 2, wherein: The adjusting assembly (12) includes: A fixed block (121) is fixedly connected to the side wall of the fixed column (10). A first motor (122) is fixedly connected to the side wall of the fixed block (121). A threaded rod (123) is fixedly connected to the output end of the first motor (122). A connecting block (124) is threadedly sleeved on the threaded rod (123). The connecting block (124) is fixedly connected to the sliding column (11) close to the side wall of the flame retardant test box (1). Convex rods (125) are fixedly connected to the side walls of the sliding column (11) and the fixed column (10). A scissor-type connecting rod (126) is hinged between the plurality of convex rods (125), and a plurality of telescopic partition plates (127) are hingedly installed at the lower hinge of the scissor-type connecting rod (126).

4. A performance testing system for a flame-retardant cable used in coal mines according to claim 3, characterized in that: There are two groups of the testing assemblies (13), and the testing assembly (13) includes: A fixed seat (131) is fixed on the inner wall of the flame retardant test chamber (1). A lead screw (132) is rotatably connected inside the fixed seat (131). A second motor (133) is fixedly connected to the side wall of the flame retardant test chamber (1). The output end of the second motor (133) is fixedly connected to the lead screw (132). A sliding seat (134) is threadedly connected to the lead screw (132). An infrared distance measuring instrument (135) is fixedly installed on the surface of the sliding seat (134).

5. The performance testing system for a flame-retardant cable used in coal mines according to claim 4, characterized in that: The calibration assembly (136) includes: A connecting frame (361) is fixedly connected to the top surface of the fixed seat (131). A receiving column (362) is fixedly connected to the end of the connecting frame (361). A cavity is formed inside the receiving column (362). A spring (363) is fixedly connected inside the receiving column (362). The other end of the spring (363) is fixedly connected to a rubber contact rod (364). A contact block (365) is fixedly connected to the side wall of the sliding column (11). The rubber contact rod (364) is in contact with the contact block (365).

6. The performance testing system for a flame-retardant cable used in coal mines according to claim 5, characterized in that: The clamping assembly (15) includes: A special-shaped frame (151) is fixed on the side walls of two sliding columns (11) on opposite sides. A third motor (152) is fixedly connected to the side wall of one end of the special-shaped frame (151). The output end of the third motor (152) is fixedly connected to a rotating rod (153). A double-headed screw (154) is clamped on the rotating rod (153). Sliding blocks (155) are symmetrically and threadedly installed on the double-headed screw (154). An L-shaped frame (156) is fixedly connected to the sliding block (155). A clamping plate (157) is fixedly connected to the end of the L-shaped frame (156). A sheet sensor (158) is fixedly installed on the inner wall of the clamping seat (14).

7. A performance testing system for a flame-retardant cable used in coal mines according to claim 6, characterized in that: There are two sets of the sliding block (155), the L-shaped frame (156) and the clamping plate (157) symmetrically arranged about the axis of the clamping seat (14). The inner walls of the two clamping plates (157) are in clamping contact with the outer wall of the cable body (7).

8. A performance testing system for a flame-retardant cable used in coal mines according to claim 7, characterized in that: The double-headed screw (154) is provided corresponding to the number of the clamping seats (14).

9. The performance testing system for a flame-retardant cable used in coal mines according to claim 8, wherein: The controller (3) is electrically connected to the burner (2), the drive motor (81), the first motor (122), the second motor (133), the third motor (152), the infrared distance measuring instrument (135) and the sheet sensor (158).

10. A test method applied to a performance test system for a flame-retardant cable for coal mines described in any one of claims 1-9, characterized in that, It includes the following steps: S1: Cable spacing adjustment. The adjustment assembly (12) is used to control multiple sliding columns (11) to drive the clamping seat (14) to move horizontally synchronously, so as to adjust the spacing between them to adapt to the cable specifications. At the same time, multiple telescopic partition plates (127) synchronously expand and contract as the sliding columns (11) adjust the spacing and are in a suitable position; S2: Cable feeding. After the staff preliminarily arranges the cable body (7) adaptively, the cable body (7) is moved to a specified position through the feeding assembly and is fed into the clamping seat (14), realizing the rapid feeding of the cable body (7). S3: Cable fixation. When the cable body (7) enters the clamping seat (14), the third motor (152) is started to drive the rotating rod (153) to drive a plurality of double-headed screws (154) to rotate, so that the two sliding blocks (155), L-shaped frames (156) and clamping plates (157) on the double-headed screws (154) move symmetrically towards each other, thereby clamping the cable body (7) and realizing the synchronous clamping and fixation of multiple groups of cable bodies (7); S4: Cable flame retardancy test. The burner (2) is started, and the burner (2) generates a stable flame to conduct a combustion test on the cable body (7). During the test, the driving machine (81) is started to drive the rotating rod (8) to rotate, so that the test frame (9) on the rotating rod (8) rotates, so as to simulate the cable flame retardancy under different angles and more comprehensively test the flame retardancy performance of the cable; S5: Measurement of the carbonization height of the cable. The second motor (133) is driven to rotate the lead screw (132) to drive the slide seat (134) outside it to move horizontally. The infrared rangefinder (135) moves horizontally synchronously to accurately measure the height of the cable body (7) that has not been burned and the vertical height between the cable body (7) and the bottom surface of the flame retardancy test box (1) for preliminary measurement; S6: Measurement correction. The driving machine (81) is started to drive the rotating rod (8) and the test frame (9) to rotate. The extrusion distance between the contact block (365) and the rubber contact rod (364) is used to judge whether the test frame (9) and the contact block (365) are in a vertical state, ensuring that the infrared rangefinder (135) and the test frame (9) are in an absolutely horizontal ideal state to avoid the influence of the angle difference on the measurement accuracy; S7: Measurement and calculation of the carbonization height of the cable. The slide seat (134) and the infrared rangefinder (135) on its surface are driven to move horizontally again. The infrared rangefinder (135) measures the carbonization height of the cable body (7) after combustion. The controller (3) accurately calculates the initial recorded height data of the cable body (7) and the current measured residual height data to obtain the carbonization height of the cable body (7); S8: Generation of measurement data. The controller (3) collects various data during the test in real time, such as temperature, time, cable combustion conditions, etc., and conducts analysis and processing, and finally generates a test report, so as to facilitate the staff to view the flame retardancy test data and evaluate the performance of the flame retardant cable for coal mines.

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