Mining special cable bending test equipment

Abstract

The utility model belongs to the technical field of detection equipment, and discloses mining special cable bending test equipment, which comprises a workbench, a direct current resistance tester, a PLC (programmable logic controller) electrical control unit and a PC (personal computer) control unit are mounted on the workbench, a driving mechanism is mounted on the workbench, a driving belt wheel is mounted at the output end of the driving mechanism, and the driving belt wheel is driven by a motor. The driving belt wheel is in transmission connection with a driven belt wheel, a rotating shaft is installed at the axis of the driven belt wheel, and rotating teeth are installed on the rotating shaft; the workbench is provided with two fixed pulley assemblies and a movable pulley assembly, and the movable pulley assembly is located between the two fixed pulley assemblies. By the adoption of the structural design, the corresponding bending wheels can be selected according to different cable models, the bending strength and bending plastic deformation of the cable are larger, working condition simulation is closer, and relevant detection data can be obtained on line in real time.

Description

Technical Field

[0001] The utility model belongs to the technical field of detection equipment, and particularly relates to a bending test and testing equipment for special mining cables. Background Art

[0002] The bending detection equipment for special mining cables is mainly used for detecting the bending performance of special cables (mining cables for shearers) in the coal mining industry. The main process actions are to simulate the extremely harsh working conditions of the movement, torsion, and bending states of the mining cable under the moving state of the shearer. This test equipment has a device for detecting whether the power core and control core of the cable are short-circuited or open-circuited, and can automatically alarm when a short circuit or open circuit occurs. Each time the testing machine makes a round trip, the tested part of the cable should form a process from a straight state to a bent state. (Detection standard: After the cable is bent 9000 times, the conductor is not short-circuited or open-circuited.)

[0003] The traditional bending test equipment for mining cables uses a vertical cable suspension structure for working condition simulation, which is composed of an electrical control unit, an equipment frame, an upper pulley group, a lower pulley group, a moving component, etc. This structure is divided into two groups of moving wheels up and down. Among them, the upper pulley is a suspended moving mechanism, and the lower pulley is a fixed swing arm structure. The two groups of pulley groups provide the bending radius required for the cable. One end of the cable installation method is fixed and the other end is movable. The bending of the cable is achieved by the movement of the upper slider, and the bending performance and defects of the cable are detected through the repeated bending of the cable;

[0004] However, the performance of mining cables is the most critical technical indicator in the industry. With more cable sampling and detection data, there are still many deficiencies in the equipment detection process and detection efficiency.

[0005] 1. In the actual detection process of traditional detection equipment, the tension data cannot be obtained, and it is impossible to maintain a constant tension test throughout the entire test stage. The included angle of the bending radius is relatively large, and the plastic deformation of the internal structure of the cable during bending is small, so it is impossible to simulate extremely harsh working conditions. In addition, the torsion function during the use of the cable cannot be realized;

[0006] 2. The installation of the cable to be tested is relatively cumbersome, and the cable to be detected needs to be installed inside the moving drag chain;

[0007] 3. Since the bending of the cable depends on the upper pulley group to provide the bending force, and the moving speed of the upper pulley is relatively slow, the detection speed depends on the moving speed. The drive structure is an AC reduction motor + chain drive, with 3 - 5 detections per minute, and it takes 30 - 50 hours to complete the test;

[0008] 4. It is impossible to read and upload key detection data online in real time. Only switch signals are used to transmit on and off. Content of the Utility Model

[0009] Aiming at the problems raised in the above-mentioned background art, the purpose of the present utility model is to provide a bending test and testing device for special mining cables.

[0010] To achieve the above technical purpose, the technical solution adopted by the present utility model is as follows:

[0011] A bending test and testing device for special mining cables includes a workbench, on which a DC resistance tester, a PLC electrical control unit, and a PC computer control unit are installed. A driving mechanism is installed on the workbench, and an active pulley is installed at the output end of the driving mechanism. The active pulley is connected to a driven pulley by belt drive. A rotating shaft is installed at the axis of the driven pulley, and a rotating tooth is installed on the rotating shaft.

[0012] Two groups of fixed pulley assemblies and one group of movable pulley assemblies are installed on the workbench. The movable pulley assembly is located between the two groups of fixed pulley assemblies. The movable pulley assembly includes a guide rail installed on the workbench, and two sliders are slidably installed on the guide rail. A rack is fixedly installed together on the lower sides of the two sliders. The rack is meshed and matched with the rotating tooth, and bending wheels are installed on both sliders.

[0013] A clamping and twisting mechanism and a weight stretching mechanism are installed on the workbench. The weight stretching mechanism includes a guide post arranged on the workbench, a moving sliding plate is slidably installed on the guide post, a cable clamp is installed on the moving sliding plate, the moving sliding plate is connected to a chain, the other end of the chain is connected to a weight block, the weight block is suspended, and several idler sprockets are installed on the workbench. The horizontal height of the idler sprockets is higher than the horizontal height of the moving sliding plate.

[0014] Further defined, the clamping and twisting mechanism includes a three-jaw chuck and a rotating motor. With such a design, the three-jaw chuck is responsible for clamping the cable, and the rotating motor rotates and twists the three-jaw chuck and the clamped cable.

[0015] Further defined, the driving mechanism includes a driving motor and a motor speed reducer unit. With such a design, the operation of the driving motor realizes the rotation of the active pulley, and the setting of the motor speed reducer unit makes the speed ratio more accurate.

[0016] Further defined, at least three groups of belts are installed between the active pulley and the driven pulley. With such a design, the accuracy of speed transmission and the service durability are ensured.

[0017] Further defined, travel switches are installed on both sides of the workbench where the movable pulley assembly is located. With such a design, the travel switches can feedback the moving position of the slider and then give a signal to the driving mechanism to make the driving mechanism rotate back.

[0018] The beneficial effects of adopting the present utility model:

[0019] With the structural design of the present utility model, corresponding bending wheels can be selected according to different cable models, the bending strength and bending plastic deformation of the cable are greater, the working condition simulation is more close, and relevant detection data can be obtained online in real time;

[0020] With the structural design of the present utility model, the tester can quickly realize the quick clamping and installation of the cable and quickly realize the production detection through the normal standing work station;

[0021] In the present utility model, through the optimization of the reciprocating motion mechanism, the efficiency of a single reciprocation is improved, and the detection efficiency is increased by 50%. The upper computer PC and the lower computer PLC control unit can read the resistance data of the mining cable in real time, and can effectively monitor the data changes in the bending test process and analyze and judge. Brief Description of the Drawings

[0022] The present utility model can be further illustrated by the non-limiting embodiments given in the drawings;

[0023] Figure 1 It is a schematic structural diagram of an embodiment of a bending test device for a special mining cable of the present utility model;

[0024] Figure 2 It is a front view structural diagram of an embodiment of a bending test device for a special mining cable of the present utility model;

[0025] Figure 3 It is a right view structural diagram of an embodiment of a bending test device for a special mining cable of the present utility model;

[0026] The main element symbols are explained as follows:

[0027] Workbench 1; driving mechanism 2; driving pulley 3; driven pulley 4; rotating shaft 5; rotating teeth 6; fixed pulley assembly 7; movable pulley assembly 8; clamping and twisting mechanism 9; counterweight stretching mechanism 10;

[0028] Driving motor 21; motor reducer unit 22;

[0029] Guide rail 81; slider 82; rack 83; bending wheel 84;

[0030] Three-jaw chuck 91; rotating motor 92;

[0031] Guide post 101; moving sliding plate 102; chain 103; counterweight block 104; over-sprocket 105. Detailed Embodiment

[0032] In order to enable those skilled in the art to better understand the present utility model, the technical solutions of the present utility model will be further described below in conjunction with the drawings and embodiments.

[0033] As Figure 1 , Figure 2 , Figure 3 shown, a bending test device for a special mine cable of the present utility model includes a workbench 1. The workbench 1 is equipped with a DC resistance tester, a PLC electrical control unit, and a PC computer control unit. The workbench 1 is equipped with a driving mechanism 2. The output end of the driving mechanism 2 is equipped with a driving pulley 3. The driving pulley 3 is connected to a driven pulley 4 by belt drive. The axis of the driven pulley 4 is equipped with a rotating shaft 5. The rotating shaft 5 is equipped with a rotating gear 6;

[0034] The workbench 1 is equipped with two groups of fixed pulley assemblies 7 and one group of movable pulley assemblies 8. The movable pulley assembly 8 is located between the two groups of fixed pulley assemblies 7. The movable pulley assembly 8 includes a guide rail 81 installed on the workbench 1. Two sliders 82 are slidably installed on the guide rail 81. A rack 83 is fixedly installed on the lower sides of the two sliders 82 together. The rack 83 is meshed and matched with the rotating gear 6. Bending wheels 84 are installed on both of the two sliders 82;

[0035] The workbench 1 is equipped with a clamping and twisting mechanism 9 and a weight stretching mechanism 10. The weight stretching mechanism 10 includes a guide post 101 provided on the workbench 1. A moving sliding plate 102 is slidably installed on the guide post 101. A cable clamp is installed on the moving sliding plate 102. The moving sliding plate 102 is connected to a chain 103. The other end of the chain 103 is connected to a weight block 104. The weight block 104 is suspended. The workbench 1 is equipped with several idler sprockets 105. The horizontal height of the idler sprockets 105 is higher than the horizontal height of the moving sliding plate 102.

[0036] In this embodiment, when using a bending test device for a special mine cable, both ends of the cable are detected by the clamping and twisting mechanism 9 and the weight stretching mechanism 10. The cable body is located between the two groups of fixed pulley assemblies 7 and one group of movable pulley assemblies 8. Under the effect of the weight block 104, the cable is straightened and always in a taut state;

[0037] The driving mechanism 2 operates to drive the driving pulley 3 to rotate, thereby causing the driven pulley 4 to rotate. The rotating shaft 5 and the rotating gear 6 installed on the rotating shaft 5 rotate. Because the rotating gear 6 and the rack 83 are meshed, the rack 83 moves, and then the slider 82 moves under the limitation of the guide rail 81. The bending wheel 84 installed on the slider 82 starts to be displaced passively. Then the cable located between the two bending wheels 84 is pulled. The weight block 104 moves upward to give space for the cable to move. When the cable is bent to the test value, the driving mechanism 2 rotates back, and the cable bends towards the other end. Therefore, by controlling the number of reciprocating rotations of the driving mechanism 2, the detection of the bending strength is achieved;

[0038] Furthermore, the weight block 104 is selected and configured according to different tension requirements of the cable.

[0039] The automatic acquisition of numerical values can upload the detection data of the resistance tester to the PLC and PC systems in real time, and the monitoring can be judged according to data analysis and calculation, with high detection efficiency and high accuracy.

[0040] Preferably, the clamping and twisting mechanism 9 includes a three-jaw chuck 91 and a rotating motor 92. With such a design, the three-jaw chuck 91 is responsible for clamping the cable, and the rotating motor 92 rotates and twists the three-jaw chuck 91 and the clamped cable. In fact, the structure of the clamping and twisting mechanism 9 can also be considered according to specific situations.

[0041] Preferably, the driving mechanism 2 includes a driving motor 21 and a motor speed reduction unit 22. With such a design, the operation of the driving motor 21 realizes the rotation of the driving pulley 3, and the setting of the motor speed acceleration unit 22 makes the speed matching more accurate. In fact, the structure of the driving mechanism 2 can also be considered according to specific situations.

[0042] Preferably, at least three groups of belts are installed between the driving pulley 3 and the driven pulley 4. With such a design, the accuracy of speed transmission and the durability of use are ensured. In fact, the number of belts between the driving pulley 3 and the driven pulley 4 can also be considered according to specific situations.

[0043] Preferably, travel switches are installed on both sides of the movable pulley assembly 8 on the workbench 1. With such a design, the travel switch can feedback the moving position of the slider 82 and then give a signal to the driving mechanism 2 to make the driving mechanism 2 rotate. In fact, travel control measures can also be considered according to specific situations.

[0044] The above embodiments only exemplarily illustrate the principles and effects of the present invention, rather than limiting the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A bending test device for special mining cables, comprising a workbench (1), wherein a DC resistance tester, a PLC electrical control unit and a PC computer control unit are installed on the workbench (1), and it is characterized in that: The workbench (1) is equipped with a driving mechanism (2). The output end of the driving mechanism (2) is equipped with a driving pulley (3). The driving pulley (3) is connected to a driven pulley (4) by belt drive. The axis of the driven pulley (4) is equipped with a rotating shaft (5). The rotating shaft (5) is equipped with rotating teeth (6). The workbench (1) is equipped with two sets of fixed pulley assemblies (7) and one set of movable pulley assemblies (8). The movable pulley assembly (8) is located between the two sets of fixed pulley assemblies (7). The movable pulley assembly (8) includes a guide rail (81) installed on the workbench (1). Two sliders (82) are slidably installed on the guide rail (81). A rack (83) is fixedly installed on the lower sides of the two sliders (82) together. The rack (83) is meshed and matched with the rotating teeth (6). Bending wheels (84) are installed on both of the two sliders (82). The workbench (1) is equipped with a clamping and twisting mechanism (9) and a counterweight stretching mechanism (10). The counterweight stretching mechanism (10) includes a guide post (101) provided on the workbench (1). A moving sliding plate (102) is slidably installed on the guide post (101). A cable clamp is installed on the moving sliding plate (102). The moving sliding plate (102) is connected to a chain (103). The other end of the chain (103) is connected to a counterweight (104). The counterweight (104) is suspended. The workbench (1) is equipped with several intermediate sprockets (105). The horizontal height of the intermediate sprockets (105) is higher than the horizontal height of the moving sliding plate (102).

2. The special mine cable bending test equipment according to claim 1, characterized in that: The clamping and twisting mechanism (9) includes a three-jaw chuck (91) and a rotating motor (92).

3. The special mining cable bending test equipment according to claim 2, characterized in that: The driving mechanism (2) includes a driving motor (21) and a motor reduction unit (22).

4. The special mining cable bending test equipment according to claim 3, characterized in that: At least three belts are installed between the driving pulley (3) and the driven pulley (4).

5. The special mine cable bending test equipment according to claim 4, characterized in that: The workbench (1) is equipped with travel switches on both sides of the movable pulley assembly (8).

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