A test device for detecting tensile properties of a cable

Abstract

The present invention relates to the technical field of tensile testing, and in particular to a testing device for detecting the tensile characteristics of cables. In view of the shortcomings that the tensile length of a cable after being stretched and broken is difficult to measure and that errors may occur in manual measurement, the present invention provides a testing device for detecting the tensile characteristics of a cable, comprising a stretching machine, a slide plate slidably connected to the stretching machine, the stretching machine automatically controls the sliding of the slide plate through a control system therein, calipers for fixing the two ends of the cable to be tested are fixed to the stretching machine and the slide plate, the stretching machine is fixed to fixed rods symmetrically distributed along the stretching machine, and a positioning plate is slidably connected between the symmetrically distributed fixed rods. The present invention can test the tensile characteristics of different cables through the stretching machine, the calipers and the slide plate, and can also automatically measure the length of the cable after stretching through the cooperation of components such as the positioning plate and the laser length measuring sensor. The operation is simple and the measurement is more accurate, which facilitates the subsequent calculation of the stretching rate.

Description

Technical Field

[0001] The present invention relates to the technical field of tensile testing, and in particular to a testing device for detecting the tensile properties of a cable. Background Art

[0002] During the cable production process, in order to ensure that product quality meets relevant national standards, special testing equipment is required to detect the tensile characteristics of the cable to evaluate the mechanical properties such as the elongation and tensile strength of cable products such as BV cables. By measuring the degree of deformation of the cable under stress and the maximum tensile force it can withstand, it is verified whether it meets the requirements of national standards and ensures the safety and reliability of the cable in actual applications.

[0003] During the tensile property testing of cables, existing tensile machines usually only have simple maximum tensile force testing and tensile force control testing functions. Such equipment is relatively limited when measuring tensile values ​​because they cannot directly record the length changes of the cable during the force application process in real time. When calculating according to the formula of stretching rate (A) = (stretched length - original length) / original length × 100%, the operator needs to manually remove the two disconnected sections of the cable after stretching and measure their lengths separately to obtain the stretched length before calculating the stretching rate. This method not only increases the number of operating steps, making the entire measurement process cumbersome, but also affects the accuracy of the final data due to the potential errors in manual measurement and data processing. Summary of the Invention

[0004] In order to overcome the shortcomings that the stretched length of a cable after it is stretched and broken is difficult to measure and that manual measurement may result in errors, the present invention provides a testing device for detecting the tensile properties of a cable.

[0005] The cable is then tensioned and the cable is then tensioned, and the ...

[0006] As a preferred technical solution of the present invention, the positioning plate is provided with oblique holes symmetrically distributed along the positioning plate, and the positioning plate is slidably connected to the force-bearing frame through the oblique holes.

[0007] As a preferred technical solution of the present invention, it also includes a pulling frame, which is slidably connected to the positioning plate, fixed to the support plate, and the pulling frame is slidably connected to a magnetic plate, which moves due to the compression of the cable. A reset component is provided on the caliper close to the side of the slide for resetting the support plate after the laser length measuring sensor completes the length measurement.

[0008] As a preferred technical solution of the present invention, the reset member is configured as a magnetic block symmetrically distributed along the magnetic plate, the magnetic block is fixed to the caliper close to the side of the slide, and the magnetic block is magnetically engaged with the magnetic plate.

[0009] As a preferred technical solution of the present invention, it also includes friction blocks symmetrically distributed along the positioning plate, the friction blocks are slidably connected to the positioning plate, the friction blocks are frictionally engaged with the pull frame, and a compressed second spring is fixed between the friction blocks and the positioning plate.

[0010] As a preferred technical solution of the present invention, it also includes fixed plates symmetrically distributed along the positioning plate, transparent limiting plates are rotatably connected between the symmetrically distributed fixed plates, a torsion spring is fixed between the fixed plate and the limiting plate, a pull plate and an L-shaped pull rod are slidably connected on the positioning plate, the pull plate and the L-shaped pull rod are slidably connected, the pull plate is in contact with the limiting plate, the L-shaped pull rod moves and contacts with the force frame, and a tension spring is fixed between the L-shaped pull rod and the positioning plate.

[0011] As a preferred technical solution of the present invention, the pull plate has inclined holes symmetrically distributed along the L-shaped pull rod on one side thereof, and the pull plate is slidably connected to the L-shaped pull rod through the inclined holes thereon.

[0012] As a preferred technical solution of the present invention, it also includes a reel, which is fixedly connected to the limiting plate, and the reel is fixed with a pull wire symmetrically distributed along the reel, the limiting plate is slidably connected to a combing block symmetrically distributed along the limiting plate, the combing block is fixedly connected to the pull wire adjacent to the reel, and an elastic rope is fixed between the combing block and the limiting plate.

[0013] As a preferred technical solution of the present invention, it also includes a positioning rod, which is fixed to the caliper near the side of the slide. The positioning rod points to the scale line of the positioning plate and is used to intuitively observe the original length of the cable.

[0014] Beneficial effects: The present invention can test the tensile properties of different cables through the stretching machine, calipers and slide plate, and can also automatically measure the length of the cable after stretching through the cooperation of components such as the positioning plate and the laser length measuring sensor. The operation is simple and the measurement is more accurate, which facilitates the subsequent calculation of the stretch rate.

[0015] The present invention uses a magnetic plate that adapts to the thickness of the cable to move backward, thereby driving the pull frame to slide backward, and the pull frame pulls the support plate to move backward synchronously by the same distance. In this way, the position of the support plate can adapt to the thickness of the cable, so that the cable can be better straightened by the support plate.

[0016] The present invention cooperates with the magnetic block and the magnetic plate by magnetic attraction, so that the support plate can be reset after measuring the length between the broken ends of the cable, preventing the support plate from being reset when broken, causing the broken cable to be pushed forward and affecting the measurement.

[0017] The present invention reacts the friction block through the elastic force of the compressed second spring, so that the friction block is pressed against the pull frame, increasing the friction between the pull frame and the friction block, and preventing the pull frame from sliding back and forth easily under slight force, which affects the above adjustment operation.

[0018] During the forward movement of the positioning plate of the present invention, the limiting plate is pushed to the right by the pulling plate, so that the limiting plate rotates to the left relative to the fixed plate until it contacts the front side of the cable, thereby limiting the front side of the cable and preventing the cable from popping forward when it breaks, thereby further ensuring the accuracy of the measurement.

[0019] The present invention can straighten the cable by using the combing block during sliding, thereby preventing the cable from twisting and affecting measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the three-dimensional structure of the positioning plate, the force-bearing frame, the first spring and other components of the present invention.

[0022] Figure 3 It is a schematic diagram of the three-dimensional structure of the magnetic plate, magnetic block, friction block and other components of the present invention.

[0023] Figure 4 It is a schematic diagram of the three-dimensional structure of the supporting plate, the pulling frame and the friction block of the present invention.

[0024] Figure 5 It is a schematic diagram of the three-dimensional structure of the pull frame, friction block and second spring of the present invention.

[0025] Figure 6 It is a schematic diagram of the three-dimensional structure of the fixing plate, the limiting plate, the torsion spring and other components of the present invention.

[0026] Figure 7 It is a schematic diagram of the three-dimensional structure of the pull plate, L-shaped pull rod, tension spring and other components of the present invention.

[0027] Figure 8 It is a schematic diagram of the three-dimensional structure of the components such as the limiting plate, the reel and the combing block of the present invention.

[0028] Figure 9 It is a schematic diagram of the three-dimensional structure of the reel, combing block and elastic rope of the present invention.

[0029] Figure 10 It is a schematic diagram of the three-dimensional structure of the caliper, the positioning plate and the positioning rod of the present invention.

[0030] Marked in the figure: 1-stretching machine, 2-slide plate, 3-caliper, 301-cable, 4-fixed rod, 5-positioning plate, 501-laser length measuring sensor, 6-force frame, 7-first spring, 8-support plate, 9-pull frame, 10-magnetic plate, 11-magnetic block, 12-friction block, 13-second spring, 14-fixed plate, 15-limiting plate, 16-torsion spring, 17-pull plate, 18-L-shaped pull rod, 19-tension spring, 20-reel, 21-combing block, 22-elastic rope, 23-positioning rod. DETAILED DESCRIPTION

[0031] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments, but this does not limit the scope of protection and application of the present invention.

[0032] Example 1: A testing device for detecting the tensile properties of a cable, such as Figure 1-Figure 3 As shown, it includes a stretching machine 1, the lower part of the stretching machine 1 is connected to a slide plate 2 for sliding along the up and down directions, the stretching machine 1 automatically controls the slide plate 2 to slide up and down through the control system therein, the stretching machine 1 and the slide plate 2 are fixed with calipers 3, the upper and lower calipers 3 are respectively used to fix the upper and lower ends of the cable 301 to be tested, the middle rear side of the stretching machine 1 is fixed with fixed rods 4 symmetrically distributed along the left and right sides of the stretching machine 1, and a positioning plate 5 is connected between the symmetrically distributed fixed rods 4 along the front and back directions for sliding, the positioning plate 5 is provided with oblique holes symmetrically distributed along the left and right sides of the positioning plate 5, and a scale line for measuring the length of the cable 301 is marked between the upper and lower ends of the positioning plate 5. Initially, only the upper end of the cable 301 is in contact with the upper end scale line of the positioning plate 5 Alignment, a groove is provided on the side of the positioning plate 5 close to the scale line, and a laser length measuring sensor 501 is fixedly connected to the middle of the positioning plate 5. The laser length measuring sensor 501 is used to measure the length between the breakpoints of the cable 301 after the cable 301 is broken in the middle. The rear side of the stretching machine 1 is slidably connected to the force frame 6 in the up and down directions. The positioning plate 5 is slidably connected to the force frame 6 through the inclined hole thereon. The force frame 6 is used to push the positioning plate 5 to move forward close to the cable 301 after the cable 301 is stretched. The slide plate 2 slides downward and contacts the lower part of the force frame 6. A first spring 7 is fixedly connected between the fixing rod 4 and the positioning plate 5. A transparent support plate 8 is provided in the groove of the positioning plate 5, and the support plate 8 supports the rear side of the cable 301.

[0033] When using this testing device to perform a tensile test, first, the stretching machine 1 automatically controls the slide plate 2 to move downward to the position as shown in FIG. Figure 1 The initial position shown is calculated and the initial distance moved downward is calculated, so that the initial distance between the upper and lower calipers 3 can be determined. Subsequently, the same length of the cable 301 to be tested is cut each time, so that the upper and lower ends of the cable 301 are respectively fixed on the upper and lower calipers 3, so as to determine the original length of the cable 301;

[0034] Next, the stretching machine 1 is controlled so that the slide plate 2 drives the lower clamp 3 to move downward. During the downward movement, the cable 301 is stretched. After being stretched to a certain extent, the slide plate 2 first moves downward until it contacts the lower part of the force frame 6. The slide plate 2 then drives the force frame 6 to move downward. The force frame 6 squeezes the positioning plate 5 through the inclined hole and slides forward along the fixed rod 4. The first spring 7 is compressed, so that the positioning plate 5 drives the supporting plate 8 to move forward until it contacts the cable 301. At this time, the lower clamp 3 moves downward to the limit (positioning The stretched cable 301 may be broken before the lower caliper 3 moves downward to the limit. The length between the broken ends of the cable 301 is detected by the laser length measuring sensor 501. The length measured by the laser length measuring sensor 501 is then subtracted from the length of the measuring plate 5 to obtain the length of the stretched cable 301. The stretched cable 301 may also not be broken when the lower caliper 3 moves downward to the limit. In this case, the length of the measuring plate 5 is the length of the stretched cable 301.

[0035] Finally, remove the cable 301, control the stretching machine 1 so that the slide plate 2 drives the lower caliper 3 to move upward and reset, the first spring 7 resets, the positioning plate 5 slides backward along the fixing rod 4 and resets, and the positioning plate 5 squeezes the force frame 6 through the inclined hole thereon and moves upward and resets.

[0036] In summary, the present invention can test the tensile properties of different cables 301 through the stretching machine 1, caliper 3 and slide plate 2, and through the cooperation of components such as the positioning plate 5 and the laser length measuring sensor 501, it can also automatically measure the length of the cable 301 after stretching. The operation is simple and the measurement is more accurate, which facilitates the subsequent calculation of the stretching rate.

[0037] Example 2: Based on Example 1, Figure 3-Figure 5As shown, it also includes a pull frame 9, which is slidably connected to the positioning plate 5, and the rear side of the pull frame 9 is fixed to the support plate 8. The front side of the pull frame 9 is slidably connected to the magnetic plate 10 in the up and down directions. The magnetic plate 10 is squeezed by the cable 301 and moves backward. The caliper 3 on the lower side is fixed with magnetic blocks 11 symmetrically distributed along the magnetic plate 10. The magnetic blocks 11 are magnetically attracted to the magnetic plate 10, so that after the laser length measuring sensor 501 completes the length measurement, the magnetic plate 10 pulls the support plate 8 forward and resets through the pull frame 9. The middle part of the positioning plate 5 is slidably connected to the friction blocks 12 symmetrically distributed along the positioning plate 5 in the left and right directions. The friction blocks 12 are frictionally matched with the pull frame 9, and a compressed second spring 13 is fixed between the friction block 12 and the positioning plate 5.

[0038] In order to make the position of the support plate 8 adapt to the thickness of the cable 301, so that the cable 301 can be better supported by the support plate 8, the following specific operations are performed:

[0039] When the lower end of the cable 301 is fixed on the lower caliper 3, the magnetic plate 10 adapts to the thickness of the cable 301 and retreats, thereby driving the pull frame 9 to slide backward, and the pull frame 9 pulls the support plate 8 to retreat synchronously by the same distance. In this way, the position of the support plate 8 can be adapted to the thickness of the cable 301. When the lower caliper 3 stretches the cable 301, the magnetic block 11 drives the magnetic plate 10 to slide downward along the pull frame 9 through magnetic attraction. When the magnetic plate 10 slides down to the bottom of the pull frame 9, the magnetic plate 10 stops moving downward, and the lower caliper 3 drives the magnetic block 11 to continue moving downward.

[0040] After the laser length measuring sensor 501 completes the length measurement, the cable 301 is removed, and the caliper 3 on the lower side drives the magnetic block 11 to move upward. During this process, the magnetic block 11 moves upward to the same height as the magnetic plate 10, and the magnetic plate 10 moves forward by magnetic attraction, thereby driving the pull frame 9 to slide forward, and then driving the support plate 8 to move forward and reset. In this way, after measuring the length between the broken ends of the cable 301, the support plate 8 can be reset to prevent the support plate 8 from resetting when it is broken, causing the broken cable 301 to be pushed forward, thereby affecting the measurement.

[0041] In addition, the present invention reacts the elastic force of the compressed second spring 13 to the friction block 12, so that the friction block 12 is pressed against the pull frame 9, increasing the friction between the pull frame 9 and the friction block 12, and preventing the pull frame 9 from sliding back and forth easily under slight force, thereby affecting the above-mentioned adjustment operation.

[0042] like Figure 6 and Figure 7As shown, it also includes a fixing plate 14 symmetrically distributed along the upper and lower parts of the positioning plate 5, and a transparent limiting plate 15 is rotatably connected between the fixing plates 14 symmetrically distributed above and below, and a torsion spring 16 is fixed between the fixing plate 14 and the limiting plate 15. The right part of the positioning plate 5 is slidably connected to a pulling plate 17 along the left and right directions, and the pulling plate 17 contacts the limiting plate 15. The pulling plate 17 moves to the right and pulls the limiting plate 15 to rotate, and the right part of the positioning plate 5 is slidably connected to an L-shaped pull rod 18 along the front and rear directions. The right side of the pulling plate 17 is provided with inclined holes symmetrically distributed along the upper and lower parts of the L-shaped pull rod 18. The pulling plate 17 is slidably connected to the L-shaped pull rod 18 through the inclined holes thereon, and the rear part of the L-shaped pull rod 18 moves forward and contacts the force frame 6. After that, the L-shaped pull rod 18 cannot continue to move forward, and the pulling plate 17 continues to move forward relative to the L-shaped pull rod 18 and begins to move to the right. A tension spring 19 is fixed between the L-shaped pull rod 18 and the positioning plate 5.

[0043] As the positioning plate 5 moves forward, the positioning plate 5 drives the pull plate 17, L-shaped pull rod 18 and tension spring 19 thereon to move forward as a whole. When the L-shaped pull rod 18 contacts the upper part of the force-bearing frame 6 forward, the L-shaped pull rod 18 stops moving forward, and the positioning plate 5 drives the pull plate 17 to continue moving forward. In the process of the pull plate 17 moving forward relative to the L-shaped pull rod 18, its own inclined hole is also guided by the L-shaped pull rod 18, so that the pull plate 17 also moves to the right relative to the L-shaped pull rod 18. In this way, the pull plate 17 pushes the limit plate 15 to the right, so that the limit plate 15 rotates relative to the fixed plate 14 until it contacts the front side of the cable 301, so as to limit the front side of the cable 301 and prevent the cable 301 from popping forward when it breaks, thereby further ensuring the accuracy of the measurement.

[0044] like Figure 8 and Figure 9 As shown, it also includes a reel 20, which is fixedly connected to the middle part of the limiting plate 15. The reel 20 is fixed with a pull line symmetrically distributed along the upper and lower parts of the reel 20. The left side of the limiting plate 15 is slidably connected to a combing block 21 symmetrically distributed along the upper and lower parts of the limiting plate 15 in the upper and lower directions. The combing block 21 is fixedly connected to the pull line adjacent to the reel 20, and an elastic rope 22 is fixedly connected between the combing block 21 and the limiting plate 15.

[0045] When the limiting plate 15 rotates relative to the fixed plate 14 until it contacts the front side of the cable 301, the combing block 21 surrounds the cable 301, and then quickly controls the reel 20 to reel in the pull wire thereon, so that the combing block 21 slides on the limiting plate 15, and the elastic rope 22 is stretched. The combing block 21 can straighten the cable 301 during the sliding period to prevent the cable 301 from twisting and affecting the measurement. After the measurement, the reel 20 is controlled to loosen the pull wire thereon, and the elastic rope 22 is reset to drive the combing block 21 to slide in the opposite direction and reset.

[0046] Example 3: Based on Example 2, Figure 10As shown, a positioning rod 23 is also included. The positioning rod 23 is fixed to the left rear portion of the lower caliper 3. The positioning rod 23 points to the scale line of the positioning plate 5. The positioning rod 23 facilitates the tester to intuitively observe the original length of the cable 301.

[0047] The above embodiments are provided to persons familiar with the art for implementing or using the present invention. Personnel familiar with the art may make various modifications or changes to the above embodiments without departing from the inventive concept of the present invention. Therefore, the scope of protection of the present invention is not limited to the above embodiments, but should be the maximum scope of the innovative features mentioned in the claims.

Claims

1. A test device for detecting the tensile properties of a cable, comprising a stretching machine (1), a slide plate (2) slidably connected to the stretching machine (1), the stretching machine (1) automatically controlling the slide plate (2) to slide through a control system therein, and clamps (3) for fixing both ends of a cable (301) to be tested fixedly connected to the stretching machine (1) and the slide plate (2), wherein the device is characterized in that: The stretching machine (1) is fixed with fixed rods (4) symmetrically distributed along the stretching machine (1), and a positioning plate (5) is slidably connected between the symmetrically distributed fixed rods (4). A scale line for measuring the length of the cable (301) is marked between the two ends of the positioning plate (5). Initially, only one end of the cable (301) is aligned with the end scale line of the positioning plate (5). A groove is opened on one side of the positioning plate (5) close to the scale line. A groove for measuring the length of the cable (301) is fixed to the middle of the positioning plate (5). ) a laser length measuring sensor (501) for measuring the length between the breakpoints; a stretching machine (1) is slidably connected to a force frame (6) for pushing the positioning plate (5) to move toward one side of the cable (301) after the cable (301) is stretched; a slide plate (2) slides and contacts the force frame (6); a first spring (7) is fixed between the fixing rod (4) and the positioning plate (5); a transparent support plate (8) is provided in the groove of the positioning plate (5); the support plate (8) is used to support the cable (301); The positioning plate (5) is provided with oblique holes symmetrically distributed along the positioning plate (5), and the positioning plate (5) is slidably connected to the force frame (6) through the oblique holes thereon; The apparatus further comprises a pull frame (9), the pull frame (9) being slidably connected to the positioning plate (5), the pull frame (9) being fixedly connected to the support plate (8), the pull frame (9) being slidably connected to a magnetic plate (10), the magnetic plate (10) being moved by being squeezed by the cable (301), and a reset member for resetting the support plate (8) after the laser length measuring sensor (501) completes the length measurement being provided on the caliper (3) on one side of the slide plate (2); The reset member is configured as a magnetic block (11) symmetrically distributed along the magnetic plate (10), the magnetic block (11) being fixed to the caliper (3) on one side close to the slide plate (2), and the magnetic block (11) and the magnetic plate (10) being magnetically engaged; It also includes friction blocks (12) symmetrically distributed along the positioning plate (5), the friction blocks (12) and the positioning plate (5) are slidably connected, the friction blocks (12) and the pull frame (9) are frictionally engaged, and a compressed second spring (13) is fixed between the friction blocks (12) and the positioning plate (5); The invention also includes fixed plates (14) symmetrically distributed along the positioning plate (5), transparent limiting plates (15) are rotatably connected between the symmetrically distributed fixed plates (14), a torsion spring (16) is fixed between the fixed plates (14) and the limiting plates (15), a pull plate (17) and an L-shaped pull rod (18) are slidably connected on the positioning plate (5), the pull plate (17) and the L-shaped pull rod (18) are slidably connected, the pull plate (17) contacts the limiting plate (15), the L-shaped pull rod (18) moves and contacts the force frame (6), and a tension spring (19) is fixed between the L-shaped pull rod (18) and the positioning plate (5).

2. A testing device for detecting the tensile properties of a cable according to claim 1, characterized in that: The pull plate (17) is provided with oblique holes symmetrically distributed along the L-shaped pull rod (18) on one side thereof close to the L-shaped pull rod (18), and the pull plate (17) is slidably connected to the L-shaped pull rod (18) through the oblique holes thereon.

3. A testing device for detecting the tensile properties of a cable according to claim 2, characterized in that: The utility model also includes a wire reel (20), the wire reel (20) is fixedly connected to the limiting plate (15), a pull line symmetrically distributed along the wire reel (20) is fixedly connected to the wire reel (20), the limiting plate (15) is slidably connected to a combing block (21) symmetrically distributed along the limiting plate (15), the combing block (21) is fixedly connected to the pull line adjacent to the wire reel (20), and an elastic rope (22) is fixedly connected between the combing block (21) and the limiting plate (15).

4. A testing device for detecting the tensile properties of a cable according to claim 3, characterized in that: The utility model further comprises a positioning rod (23), the positioning rod (23) being fixed to the caliper (3) near one side of the slide plate (2), the positioning rod (23) pointing to the scale line of the positioning plate (5), and the positioning rod (23) being used for visually observing the original length of the cable (301).

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