Tension detection device for cold and hot shrinkage cable accessory

Abstract

The utility model relates to the technical field of cable tension detection, in particular to a tension detection device for cold and hot shrinkage cable accessories, which comprises a detection table, a mounting box fixedly connected to the top of the detection table, through grooves formed in two sides of the mounting box, a worm rotatably connected to the inside of the mounting box, and a worm gear meshed with the outer wall of the worm. The worm wheel is rotatably connected to the inner wall of the mounting box, the outer wall of the shaft part of the worm wheel is fixedly connected with a gear, the bottom of the gear is engaged with a rack, the rack is slidably connected to the top of the detection table and penetrates through the through groove, and the top of the detection table is provided with a clamping mechanism for clamping a cable; sliding rods are fixedly connected to the side walls of the two fixing blocks, and two sets of sliding blocks are arranged at the top of the detection table. Compared with the prior art, the clamping area, the friction force and the firmness are increased, so that the condition that the cable slips or is broken due to infirm clamping or too small contact surface in the tension test process is prevented.

Description

Technical Field

[0001] This utility model relates to the field of cable tensile testing technology, and in particular to a tensile testing device for cold and heat shrinkable cable accessories. Background Technology

[0002] With the continuous development of industries such as power and communications, cables are increasingly widely used in various equipment. Especially in environments requiring long-term stable operation, the quality and safety of cables become paramount. During the installation of heat-shrinkable and cold-shrinkable cable accessories, tensile strength is a key performance indicator. The tensile strength of cable accessories needs to meet certain standard requirements to ensure their reliability during long-term use. Insufficient tensile strength may lead to poor contact between the accessory and the cable, resulting in cable failure; while excessive tensile strength can cause deformation or damage to the accessory materials, affecting the service life and safety of the cable accessories. Therefore, tensile strength testing has become an indispensable part of the installation and quality inspection process for cable accessories.

[0003] A Chinese patent has been published: A cable tension testing device, patent announcement number: CN207540892U. This patent "includes a base, on which a fixed plate, a movable plate, a tension display and a cylinder mounting seat are provided. A cylinder is provided on the cylinder mounting seat, and a tension sensor is provided inside the cylinder. The tension sensor is connected to the tension display. The cylinder output shaft is connected to the movable plate. Cable fixing holes are provided on the movable plate and the fixed plate. A smooth rod is provided between the fixed plate and the cylinder mounting seat. The smooth rod passes through a stepped hole provided on the movable plate, one end of which is connected to the fixed plate, and the other end is connected to a stepped protrusion provided on the cylinder mounting seat. A spring is provided on the stepped protrusion."

[0004] When this device performs cable tensile testing, locking screws are used to fix both ends of the cable through their bottom ends. Because the contact point of the locking screws is concentrated on the same point on the outer wall of the cable, this concentrated contact method results in excessive tensile force on the cable at the locking screw when the cable is pulled. Due to the small and unevenly distributed contact surface, the tensile force is concentrated in a small area, which can easily cause local breakage of the cable at that point or produce uneven stress distribution, thus making it impossible to apply tensile force evenly. At the same time, due to the small contact surface, the fixing effect is poor, and one end of the cable may slip out of the fixing plate, making it impossible to perform tensile testing normally. This design defect affects the fixing effect of the cable and the accuracy of the tensile test, resulting in the inability to achieve effective tensile testing. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a tensile testing device for cold and heat shrinkable cable accessories to solve the problem.

[0006] To achieve the above objectives, this utility model provides a tensile testing device for heat-shrinkable cables, comprising a testing platform, a mounting box fixedly connected to the top of the testing platform, through slots on both sides of the mounting box, a worm gear rotatably connected inside the mounting box, a worm wheel meshing with the outer wall of the worm gear, the worm wheel rotatably connected to the inner wall of the mounting box, a gear fixedly connected to the outer wall of the shaft of the worm wheel, a rack meshing with the bottom of the gear, the rack slidably connected to the top of the testing platform and passing through the through slots, a clamping mechanism for clamping the cable provided on the top of the testing platform, a tension gauge fixedly connected to one end of the rack, and the tension end of the tension gauge connected to the clamping mechanism.

[0007] Preferably, the clamping mechanism includes two fixing blocks, which are fixedly connected to both sides of the testing platform. A sliding rod is fixedly connected to the sidewall of each of the two fixing blocks. Two sets of sliders are provided on the top of the testing platform. One end of each sliding rod is fixedly connected to the sidewall of one set of sliders, and the other set of sliders is slidably connected to the outer wall of the sliding rod. A stabilizing rod is fixedly connected between the opposing surfaces of the two sets of sliders. A clamping block is provided between the opposing surfaces of the sliders. One of the clamping blocks is slidably connected to the outer wall of the stabilizing rod. A clamping groove for clamping cables is provided on the sidewall of each clamping block. A threaded rod is rotatably connected to the sidewall of one of the clamping blocks, and one end of the threaded rod penetrates the sidewall of the slider.

[0008] Preferably, the clamping mechanism further includes two semicircular plates respectively disposed at both ends of the cable. The two semicircular plates are arranged opposite each other, and a limiting groove for accommodating the cable is opened between the opposite surfaces of the two semicircular plates. The sidewall of the semicircular plate is in contact with the sidewall of the clamping block. Mounting blocks are provided at the top and bottom of the semicircular plate, and the two mounting blocks are fixed to each other by threaded bolts.

[0009] Preferably, a pull rod is fixedly connected between a group of sliders near the mounting box. The pull rod is convex in shape. A sleeve rod is fixedly connected to one side of the tension gauge, and one end of the sleeve rod is sleeved on the top of the pull rod.

[0010] Preferably, each of the clamping grooves is provided with an anti-slip block, and the anti-slip block is triangular in shape.

[0011] Preferably, a scale is fixedly connected to the side wall of the mounting box, and a rotating disk is fixedly connected to one end of the worm gear through the side wall of the mounting box and the scale.

[0012] The beneficial effects of this utility model are:

[0013] This tensile testing device for heat-shrinkable cables utilizes a rotating threaded rod to move a clamping block, which in turn moves a clamping groove. The arc-shaped design of the clamping groove and the anti-slip block clamp the cable's outer wall. The clamping groove and anti-slip block design effectively increase the clamping area, friction, and stability, preventing slippage or breakage during tensile testing due to insecure clamping or insufficient contact area. Furthermore, the combination of two semi-circular plates and threaded bolts enhances the fixing force at both ends of the cable, further preventing slippage due to unstable end clamping during tensile testing. This improved clamping effect ensures the cable ends are firmly fixed, avoiding slippage and breakage problems caused by insufficient contact area, insecure clamping, or stress concentration in traditional methods. The overall structural design not only optimizes the cable clamping effect but also improves the accuracy and stability of tensile testing, providing a more reliable and accurate solution for cable tensile testing. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0016] Figure 2 This is a three-dimensional structural diagram of the clamping mechanism of this utility model;

[0017] Figure 3 This is a three-dimensional structural diagram of the gear and rack of this utility model;

[0018] Figure 4 This is a three-dimensional structural diagram of the semi-circular plate and threaded bolt of this utility model;

[0019] Figure 5 This is a schematic diagram of the three-dimensional anti-slip block structure of this utility model.

[0020] The diagram is marked as follows:

[0021] 1. Testing table; 2. Mounting box; 3. Through groove; 4. Worm gear; 5. Worm wheel; 6. Gear; 7. Rack; 8. Fixing block; 9. Sliding rod; 10. Sliding block; 11. Stabilizing rod; 12. Clamping block; 13. Clamping groove; 14. Threaded rod; 15. Semicircular plate; 16. Limiting groove; 17. Mounting block; 18. Threaded bolt; 19. Pull rod; 20. Tensile gauge; 21. Sleeve rod; 22. Anti-sliding block; 23. Dial; 24. Rotary disk. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0023] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0024] like Figures 1 to 5 As shown, a tensile testing device for heat-shrinkable cable accessories includes a testing platform 1. A mounting box 2 is fixedly connected to the top of the testing platform 1. Through slots 3 are provided on both sides of the mounting box 2. A worm gear 4 is rotatably connected inside the mounting box 2. A worm wheel 5 is meshed on the outer wall of the worm gear 4. The worm wheel 5 is rotatably connected to the inner wall of the mounting box 2. A gear 6 is fixedly connected to the outer wall of the shaft of the worm wheel 5. A rack 7 is meshed at the bottom of the gear 6. The rack 7 is slidably connected to the top of the testing platform 1 and passes through the through slots 3. A clamping mechanism for clamping the cable is provided on the top of the testing platform 1.

[0025] Further, see attached document. Figures 1 to 5As shown, the clamping mechanism includes two fixed blocks 8, which are fixedly connected to both sides of the testing platform 1. Slide rods 9 are fixedly connected to the side walls of both fixed blocks 8. Two sets of sliders 10 are provided on the top of the testing platform 1. One end of the slide rod 9 is fixedly connected to the side wall of one set of sliders 10, and the other set of sliders 10 is slidably connected to the outer wall of the slide rod 9. A stabilizing rod 11 is fixedly connected between the opposing surfaces of the two sets of sliders 10. A clamping block 12 is provided between the opposing surfaces of the sliders 10. One clamping block 12 is slidably connected to the outer wall of the stabilizing rod 11. The side walls of the clamping blocks 12 are provided with clamping grooves 13 for clamping cables. A threaded rod 14 is rotatably connected to the side wall of one clamping block 12, with one end of the threaded rod 14 penetrating the side wall of the slider 10. The clamping mechanism also includes separate... Two semicircular plates 15 are provided at both ends of the cable, and the two semicircular plates 15 are arranged opposite each other. A limiting groove 16 for accommodating the cable is opened between the opposite surfaces of the two semicircular plates 15. The side wall of the semicircular plate 15 is in contact with the side wall of the clamping block 12. Mounting blocks 17 are provided at the top and bottom of the semicircular plate 15. The two mounting blocks 17 are fixed to each other by threaded bolts 18. A pull rod 19 is fixedly connected between a group of sliders 10 near the mounting box 2. The pull rod 19 is convex in shape. A tension gauge 20 is fixedly connected to one end of the rack 7. A sleeve rod 21 is fixedly connected to one side of the tension gauge 20. One end of the sleeve rod 21 is sleeved on the top of the pull rod 19. Anti-slip blocks 22 are provided inside the clamping groove 13. The anti-slip blocks 22 are triangular in shape.

[0026] When using the clamping mechanism, first place the cable between the two sets of sliders 10, then rotate the threaded rod 14. The threaded rod 14 drives the clamping block 12 to slide on the stabilizing rod 11 and move to the other side of the clamping block 12, thereby clamping the cable through the clamping groove 13. The clamping groove 13 has an arc-shaped design, which increases the contact area with the cable, making the clamping more stable. At the same time, the anti-slip slider 22 increases the friction between the clamping groove 13 and the cable, playing a role in preventing slippage. After clamping, take out the two semi-circular plates 15 and put them on both ends of the cable, and then use the threaded bolts 18 to... Fix the mounting block 17, then fix the semicircular plate 15, and then rotate the rotating disk 24. When the rotating disk 24 rotates, it drives the worm 4 to rotate, and the worm 4 drives the worm wheel 5 to rotate. When the worm wheel 5 rotates, it drives the gear 6 to rotate. Then, the gear 6 meshes with the rack 7, causing the rack 7 to slide on the top of the testing table 1. When the rack 7 slides, it pulls the tension gauge 20. The tension gauge 20 pulls the pull rod 19 through the sleeve rod 21. Then, the pull rod 19 pulls the slider 10 that slides on the outer wall of the slide rod 9. Then, the slider 10 pulls the cable. At the same time as pulling the cable, the semicircular plate 15 will also engage with the clamp. The sidewalls of block 12 are in contact, further preventing the cable from slipping out of the clamping groove 13, thus ensuring a more stable clamping of the cable. The tensile force value is then displayed by the tensile gauge 20. In the clamping mechanism, rotating the threaded rod 14 moves the clamping block 12, which in turn moves the clamping groove 13. The arc-shaped design of the clamping groove 13 and the anti-slip block 22 then clamp the outer wall of the cable. The design of the clamping groove 13 and the anti-slip block 22 effectively increases the clamping area, friction, and firmness, thereby preventing the cable from slipping due to insecure clamping during tensile testing. In cases where the contact surface is too small, leading to slippage or breakage, the combined fastening design of two semi-circular plates 15 and threaded bolts 18 effectively enhances the fixing force at both ends of the cable, further preventing the cable from slipping off due to unstable end clamping during tensile testing. This enhances the clamping effect, ensuring that both ends of the cable are firmly fixed, avoiding problems such as slippage and breakage caused by insufficient contact surface, unstable clamping, or stress concentration in traditional methods. The overall structural design not only optimizes the clamping effect of the cable but also improves the accuracy and stability of tensile testing, providing a more reliable and accurate solution for cable tensile testing.

[0027] Further, see attached document. Figure 3 As shown, a dial 23 is fixedly connected to the side wall of the mounting box 2. One end of the worm gear 4 passes through the side wall of the mounting box 2 and the dial 23 and is fixedly connected to a rotating disk 24. The side walls of the dial 23 and the rotating disk 24 are provided with scale values ​​so that the number of rotations of the rotating disk 24 and the pulling force can be observed.

[0028] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0029] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A tensile testing device for heat-shrinkable cable accessories, comprising a testing platform (1), characterized in that: The top of the testing platform (1) is fixedly connected to a mounting box (2). Both sides of the mounting box (2) are provided with through slots (3). The inside of the mounting box (2) is rotatably connected to a worm gear (4). The outer wall of the worm gear (4) is meshed with a worm wheel (5). The worm wheel (5) is rotatably connected to the inner wall of the mounting box (2). The outer wall of the shaft of the worm wheel (5) is fixedly connected to a gear (6). The bottom of the gear (6) is meshed with a rack (7). The rack (7) is slidably connected to the top of the testing platform (1) and passes through the through slot (3). The top of the testing platform (1) is provided with a clamping mechanism for clamping the cable. One end of the rack (7) is fixedly connected to a tension gauge (20). The tension end of the tension gauge (20) is connected to the clamping mechanism.

2. The tensile testing device for heat-shrinkable cable accessories according to claim 1, characterized in that, The clamping mechanism includes two fixed blocks (8), which are fixedly connected to both sides of the testing platform (1). The side walls of the two fixed blocks (8) are fixedly connected to slide rods (9). The top of the testing platform (1) is provided with two sets of sliders (10). One end of the slide rod (9) is fixedly connected to the side wall of one set of sliders (10), and the other set of sliders (10) is slidably connected to the outer wall of the slide rod (9). The opposing surfaces of the two sets of sliders (10) are fixedly connected to a stabilizing rod (11). The opposing surfaces of the sliders (10) are provided with clamping blocks (12). One of the clamping blocks (12) is slidably connected to the outer wall of the stabilizing rod (11). The side walls of the clamping blocks (12) are provided with clamping grooves (13) for clamping cables. The side wall of one of the clamping blocks (12) is rotatably connected to a threaded rod (14). One end of the threaded rod (14) passes through the side wall of the slider (10).

3. The tensile testing device for heat-shrinkable cable accessories according to claim 2, characterized in that, The clamping mechanism also includes two semicircular plates (15) respectively disposed at both ends of the cable. The two semicircular plates (15) are arranged opposite each other. A limiting groove (16) for accommodating the cable is opened between the opposite surfaces of the two semicircular plates (15). The side wall of the semicircular plate (15) is in contact with the side wall of the clamping block (12). Mounting blocks (17) are provided at the top and bottom of the semicircular plate (15). The two mounting blocks (17) are fixed to each other by threaded bolts (18).

4. The tensile testing device for heat-shrinkable cable accessories according to claim 2, characterized in that, A pull rod (19) is fixedly connected between a group of sliders (10) near the side of the mounting box (2). The pull rod (19) is convex in shape. A sleeve rod (21) is fixedly connected to one side of the tension gauge (20). One end of the sleeve rod (21) is sleeved on the top of the pull rod (19).

5. The tensile testing device for heat-shrinkable cable accessories according to claim 2, characterized in that, Each of the clamping grooves (13) is provided with an anti-slip block (22), and the anti-slip block (22) is triangular in shape.

6. The tensile testing device for heat-shrinkable cable accessories according to claim 1, characterized in that, A dial (23) is fixedly connected to the side wall of the mounting box (2), and a rotating disk (24) is fixedly connected to one end of the worm gear (4) through the side wall of the mounting box (2) and the dial (23).

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