Cable terminal protection device for transformer

Abstract

The invention discloses a cable terminal protection device for a transformer, and relates to the technical field of transformer protection, the protection device comprises a base and a dragging buffer mechanism, the dragging buffer mechanism is installed on the base through a support, and the dragging buffer mechanism comprises a material returning prevention assembly, a buffer assembly and a dragging material stroking assembly; the material returning prevention assembly is used for preventing a cable in laying from returning, the cable close to the support has the surplus length and is wound and placed on the buffering assembly, the buffering assembly is used for buffering the pulling force borne by the cable close to the support, and the dragging and material stroking assembly is installed on the material returning prevention assembly and is in transmission connection with the buffering assembly. And the dragging and stroking assembly is used for reducing the bending angle of the cable close to the anti-returning assembly. The protection device buffers the tensile force of the cable at the wiring end, so that the cable close to the wiring end is prevented from being deformed due to tightening tensile force, even core wire conductors in the cable are prevented from being broken, and even the cable at the wiring end is prevented from being loosened.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer protection, and in particular relates to a cable terminal protection device for a transformer. Background Art

[0002] A transformer is an electrical device used to change AC voltage (increase or decrease voltage). It uses the principle of electromagnetic induction to achieve the transmission of electrical energy and voltage conversion. Transformers are widely used in power transmission, electronic equipment, industrial production and other fields. In the use of transformers, cables are mainly used to connect the various components of the transformer. Usually, cables are needed to connect to power sources, loads and other related equipment to ensure the transmission of power.

[0003] In the process of power transmission, cable bridges are needed to support the laying of cable lines. According to a Chinese patent document with a patent application number of 202221701256.1 and a name of a box-type transformer for preventing cables from falling, when the cables inside the transformer are extended to the external cable bridge, the cables located outside are easy to fall under the action of gravity, resulting in poor stability in the installation of the cables. In addition, the cables are easily damaged by sudden pulling. A cable auxiliary support mechanism is provided on the mounting frame, and the two sides of the bottom of the transformer body are electrically connected to the cables. The triangular stress formed on the first guide roller and the second guide roller can enhance the stability of the cable installation and effectively prevent the cables from falling.

[0004] However, when the cable outside the transformer falls due to gravity or is pulled by external force applied during laying, the part of the cable adjacent to the transformer terminal always remains taut and stretched, that is, the cable and the transformer terminal are always in a rigidly pulled taut state. If the external force is too large, it can easily cause the cable terminal to loosen or even the core conductor in the cable to break, affecting the service life of the cable. Summary of the invention

[0005] The purpose of the present invention is to provide a cable terminal protection device for a transformer with a simple structure and reasonable design in order to solve the above problems.

[0006] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0007] A cable terminal protection device for a transformer, comprising:

[0008] A base, on which the transformer is fixedly installed, a cable tray is fixedly arranged on one side of the base, and the cable tray is used to lay and support the cables led out from the cable terminals of the transformer;

[0009] A pulling and buffering mechanism, wherein the pulling and buffering mechanism is installed on a base through a support, and the pulling and buffering mechanism is arranged on a side adjacent to the cable terminal of the transformer, the pulling and buffering mechanism comprises an anti-backwarding component, a buffer component and a pulling and caressing component, the anti-backwarding component is used to prevent the cable from retreating during laying, the buffer component is installed on a support, the support is installed on the base and is close to the cable terminal of the transformer, the cable close to the support has a surplus length and is wound and placed on the buffer component, the buffer component is used to buffer the tension exerted on the cable close to the support, the pulling and caressing component is installed on the anti-backwarding component, and the pulling and caressing component is transmission-connected to the buffer component, the pulling and caressing component is used to reduce the bending angle of the cable close to the anti-backwarding component.

[0010] As a further optimization solution of the present invention, a first through hole is opened at the side end of the support, and the first through hole is used to pass the cable to be laid;

[0011] The buffer assembly includes an outer sleeve, an inner sleeve, a sealing plate, a fixed rod, a sliding sleeve, a first spring and a slider, the outer sleeve is fixedly mounted on the support, the support is communicated with the outer sleeve through a first through hole, the inner sleeve is slidably connected to the outer sleeve, one end of the inner sleeve away from the support is fixedly connected to the sealing plate, the support located inside the outer sleeve is fixedly connected with a fixed rod, the outside of the fixed rod is slidably connected to the sliding sleeve, one end of the fixed rod away from the support is fixedly connected with a slider, the slider is located inside the sliding sleeve and is slidably connected to the sliding sleeve, the circumferential side portion of the fixed rod located inside the sliding sleeve is sleeved with the first spring, and one end of the sliding sleeve away from the support is fixedly connected to the sealing plate;

[0012] The sealing plate is provided with a second through hole for passing a cable, and the anti-retraction component is installed at a position close to the second through hole on the sealing plate.

[0013] As a further optimization scheme of the present invention, the anti-material-slipping components are provided in multiple groups, the multiple groups of the anti-material-slipping components are installed on one side of the sealing plate close to the support, and the multiple groups of the anti-material-slipping components are evenly distributed around the second through hole.

[0014] As a further optimization scheme of the present invention, the anti-material back-off assembly includes a bracket, a first rocker arm, a second spring and a clamping block. The bracket is fixedly mounted on the sealing plate, and the end of the bracket away from the sealing plate is rotatably connected to the first rocker arm, and the end of the first rocker arm close to the axial centerline of the second through hole is fixedly connected to the clamping block, and the end of the clamping block away from the first rocker arm has an arc convex portion, and the side part of the end of the first rocker arm away from the axial centerline of the second through hole is fixedly connected to the second spring, and the end of the second spring away from the first rocker arm is fixedly connected to the bracket.

[0015] As a further optimization scheme of the present invention, the pulling and stroking material component includes a support rod, a protrusion, a second rocker rod and a third spring, the sliding sleeve is provided with a sliding groove, the side end of the slider is fixedly connected with the support rod, the support rod is slidably connected to the sliding sleeve through the sliding groove, the support rod passes through the sliding groove to the outer end of the sliding sleeve and is fixedly connected with a protrusion, a clamping block in a group of anti-return material components close to the sliding sleeve is rotatably connected with the second rocker rod, the second rocker rod is fixedly connected with a third spring on a side facing the first rocker rod, the end of the third spring away from the second rocker rod is fixedly connected to the first rocker rod, and the second rocker rod has an arc convex portion on a side away from the first rocker rod.

[0016] As a further optimization solution of the present invention, a ball is embedded on one side of the arc convex portion of the second swing rod.

[0017] As a further optimization solution of the present invention, there are multiple pulling and buffering mechanisms, there are multiple first through holes, and the first through holes are arranged in a one-to-one correspondence with the pulling and buffering mechanisms.

[0018] As a further optimization scheme of the present invention, a support assembly is also provided on the base, and the support assembly includes a knob, a screw and a bracket. The screw is threadedly connected to the base, one end of the screw located outside the base is fixedly connected to the knob, and one end of the screw located inside the base is rotatably connected to the bracket, and the abutment surface of the bracket abuts against the outer surface of the support.

[0019] The present invention has at least the following beneficial effects: the device of the present invention is provided with a pulling buffer mechanism between the transformer and the cable bridge, and the cable near the cable terminal of the transformer is clamped and fixed by means of the anti-retraction component to prevent the cable from exiting the inner sleeve;

[0020] Moreover, the device of the present invention uses a buffer component to buffer the tension of the cable near the transformer. Since the cable is wound in the inner sleeve with a surplus length, the cable between the clamping position and the cable terminal connection position is flexibly distributed and can be pulled and stretched, thereby avoiding the existing situation that the cable is pulled straight by force, resulting in the loosening of the cable terminal and even the breakage of the core conductor in the cable.

[0021] In addition, when the clamping block pulls the cable, the protrusion resists the second swing arm, causing the second swing arm to swing toward the direction close to the cable, so as to push the cable near the clamping position to unfold, reduce the bending angle of the cable at the clamping position, and reduce the impact of the cable bending on the electrical performance of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 The present invention Figure 1 The enlarged view of point A in the middle;

[0024] Figure 3 It is a partial cross-sectional structural schematic diagram of the support and the pulling buffer mechanism in the present invention;

[0025] Figure 4 It is a partial cross-sectional structural schematic diagram of the pull-buffer mechanism in the present invention;

[0026] Figure 5 The present invention Figure 4 Enlarged view of point B in the middle.

[0027] In the figure: 1. transformer; 11. base; 12. cable tray; 121. wire tube; 2. pulling and buffering mechanism; 21. buffering assembly; 211. fixing rod; 212. first spring; 213. sliding sleeve; 214. sliding block; 215. outer sleeve; 216. inner sleeve; 217. sealing plate; 2171. second through hole; 22. pulling and caressing material assembly; 221. supporting rod; 222. protrusion; 223. sliding groove; 224. second swing rod; 225. third spring; 23. anti-returning material assembly; 231. clamping block; 232. first swing rod; 233. bracket; 234. second spring; 24. support; 241. first through hole; 31. knob; 32. screw rod; 33. bracket. DETAILED DESCRIPTION

[0028] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0029] In one embodiment, if Figure 1 , Figure 2 and Figure 3 As shown, the present invention provides a cable terminal protection device for a transformer, comprising:

[0030] A base 11 is used to fix the transformer 1 on the base 11. A cable tray 12 is fixedly arranged on one side of the base 11. The cable tray 12 is used to lay and support the cables led out from the cable terminals of the transformer 1. Figure 1 and Figure 2 As shown, a wire tube 121 is provided at one end of the cable tray 12 close to the base 11, and the cable terminal first passes through the wire tube 121 to penetrate into the inner side of the base 11, and waits to be further pulled to the terminal on the transformer 1 to complete the electrical connection of the cable;

[0031] The pulling and buffering mechanism 2 is installed on the base 11 through the support 24, and the pulling and buffering mechanism 2 is arranged on one side of the cable terminal of the transformer 1. The pulling and buffering mechanism 2 includes an anti-backward component 23, a buffer component 21 and an pulling and buffering component 22. The anti-backward component 23 is used to prevent the cable from retreating during laying. The buffer component 21 is installed on the support 24, and the support 24 is installed on the base 11 and close to the cable terminal of the transformer 1. Figure 3 As shown, the support 24 is rotatably connected to the base 11 by a threaded pipe thread, so that the cable connection position of the transformer 1 corresponds to the installation position of the support 24, and the cable close to the support 24 has a surplus length and is wound and placed on the buffer component 21. The buffer component 21 is used to buffer the tension exerted on the cable close to the support 24. The pulling and caressing material component 22 is installed on the anti-backup component 23, and the pulling and caressing material component 22 is transmission-connected to the buffer component 21. The pulling and caressing material component 22 is used to reduce the bending angle of the cable close to the anti-backup component 23.

[0032] It should be noted that, for the multiple connection terminals on the transformer 1, multiple pulling and buffering mechanisms 2 can be correspondingly provided to buffer the multiple cables.

[0033] Continue reading Figure 3 and Figure 4 In one embodiment, a first through hole 241 is formed at a side end of the support 24, and the first through hole 241 is used to pass the cable to be laid. Figure 3 The dotted arrow in the middle indicates the cable routing track;

[0034] The buffer assembly 21 includes an outer sleeve 215, an inner sleeve 216, a sealing plate 217, a fixing rod 211, a sliding sleeve 213, a first spring 212 and a slider 214. The outer sleeve 215 is fixedly mounted on the support 24. The support 24 is connected to the outer sleeve 215 through a first through hole 241. The inner sleeve 216 is slidably connected to the outer sleeve 215. One end of the inner sleeve 216 away from the support 24 is fixedly connected to the sealing plate 217. A fixing rod 211 is fixedly connected to the support 24 inside, and the outside of the fixing rod 211 is slidably connected to the sliding sleeve 213. The end of the fixing rod 211 away from the support 24 is fixedly connected to a slider 214, and the slider 214 is located inside the sliding sleeve 213 and is slidably connected to the sliding sleeve 213. The circumferential side of the fixing rod 211 located inside the sliding sleeve 213 is sleeved with a first spring 212, and the end of the sliding sleeve 213 away from the support 24 is fixedly connected to a sealing plate 217;

[0035] The sealing plate 217 is provided with a second through hole 2171 for passing a cable through, and the anti-retraction component 23 is installed on the sealing plate 217 at a position close to the second through hole 2171 .

[0036] In the above embodiment, after the cable terminal enters the side of the base 11 from the wire tube 121 and before passing through the first through hole 241, it first passes through the second through hole 2171, and the excess length of the cable is wound around the sleeve 213, as shown in FIG. Figure 3 As shown, the cable is wound three times. In other embodiments, the cable can be wound two times, and the cable is loosely wound on the sleeve 213 instead of being tightly wound on the sleeve 213. Moreover, the outer surface of the sleeve 213 is smooth, which reduces the friction between the wound cable and the sleeve 213 to ensure that the cable can be smoothly unfolded during the buffering process. Then, the cable is inserted into the top of the base 11 and connected to the wiring terminal of the transformer 1. When the cable is pulled, the anti-backup component 23 clamps the cable to prevent the cable from backing out of the inner sleeve 216. Under the pulling of the cable, the anti-backup component 23 drives the sleeve 213 along the sealing plate 217. Figure 4 The position shown is shifted to the right, compressing the first spring 212. At this time, under the clamping of the anti-retraction component 23, the excess length of the cable is stretched out, greatly reducing the pulling strength of the cable close to the terminal, so as to avoid the existing situation that the cable is pulled and stretched, and solve the problem that the existing cable is pulled rigidly in the direction of the axial centerline, causing the internal core conductor of the cable to break. It effectively avoids the existing cable being pulled and stretched by force, causing the cable terminal to loosen, and even the core conductor in the cable to break. At the same time, it also reduces the rigid pulling strength of the existing cable pulling on the terminal.

[0037] Please continue reading Figure 3 In one embodiment, the anti-backward component 23 is provided with multiple groups, and the multiple groups of the anti-backward component 23 are installed on the side of the sealing plate 217 close to the support 24, and the multiple groups of the anti-backward component 23 are evenly distributed around the second through hole 2171 to achieve multi-point clamping of the cable, and the anti-backward effect is good.

[0038] For example, see Figure 3 , Figure 4 and Figure 5 The anti-material back-off assembly 23 includes a bracket 233, a first rocker arm 232, a second spring 234 and a clamping block 231. The bracket 233 is fixedly mounted on the sealing plate 217. One end of the bracket 233 away from the sealing plate 217 is rotatably connected to the first rocker arm 232. One end of the first rocker arm 232 close to the axis line of the second through hole 2171 is fixedly connected to the clamping block 231. The end of the clamping block 231 away from the first rocker arm 232 has an arc convex portion. The side portion of one end of the first rocker arm 232 away from the axis line of the second through hole 2171 is fixedly connected to the second spring 234. One end of the second spring 234 away from the first rocker arm 232 is fixedly connected to the bracket 233.

[0039] In the above embodiment, if Figure 3 In the orientation shown, the cables are arranged according to the trajectory of the dotted arrows. The cables passing through the second through hole 2171 pass smoothly from right to left. When the cables are pulled to the right due to being laid on the cable tray 12, the arc convex portion of the clamping block 231 rubs against the surface of the cable, and with the help of the friction between the two, the cable is clamped and fixed to prevent the cable from withdrawing from the inner sleeve 216, so that when the cable is pulled by force, the sliding sleeve 213 is driven to move right through the sealing plate 217, so that the buffer assembly 21 plays a buffering role.

[0040] Please continue reading Figure 4 and Figure 5 In one embodiment, the pulling and stroking material component 22 includes a support rod 221, a protrusion 222, a second swing rod 224 and a third spring 225. The sliding sleeve 213 is provided with a sliding groove 223. The side end of the slider 214 is fixedly connected with the support rod 221. The support rod 221 is slidably connected to the sliding sleeve 213 through the sliding groove 223. The support rod 221 passes through the sliding groove 223 to the outer end of the sliding sleeve 213 and is fixedly connected with the protrusion 222. A clamping block 231 in a group of anti-return material components 23 close to the sliding sleeve 213 is rotatably connected with the second swing rod 224. The second swing rod 224 is fixedly connected with the third spring 225 on the side facing the first swing rod 232. The end of the third spring 225 away from the second swing rod 224 is fixedly connected to the first swing rod 232. The second swing rod 224 has an arc convex portion on the side away from the first swing rod 232.

[0041] In the above embodiment, due to the pulling force on the cable, the clamping block 231 frictionally contacts and clamps the cable, so that when the sliding sleeve 213 moves to the right, the excess wound cable quickly stretches out, which increases the bending angle between the clamping block 231 and the cable clamping position. At this time, through the contact of the protrusion 222 with the second swing rod 224, the second swing rod 224 swings toward the direction close to the cable, so as to push the cable close to the clamping position to unfold, reduce the bending angle of the cable at the clamping position, and reduce the impact of the cable bending on the electrical performance of the cable.

[0042] In one embodiment, a ball is embedded on one side of the arc convex portion of the second swing rod 224. There are multiple balls, and the spherical surface of the ball protrudes from the arc surface of the arc convex portion of the second swing rod 224, so that when the second swing rod 224 swings to push the cable, the friction on the cable is reduced, thereby facilitating the pushing and unfolding of the cable.

[0043] In one embodiment, there are multiple pull-buffer mechanisms 2, and there are multiple first through holes 241, and the first through holes 241 are arranged one-to-one with the pull-buffer mechanisms 2. The number of pull-buffer mechanisms 2 can be selected and adapted according to the number of cables required for electrical connection of equipment on the construction site.

[0044] For example, see Figure 2 and Figure 3 A support assembly is also provided on the base 11, and the support assembly includes a knob 31, a screw 32 and a bracket 33. The screw 32 is threadedly connected to the base 11, and one end of the screw 32 located outside the base 11 is fixedly connected to the knob 31, and one end of the screw 32 located inside the base 11 is rotatably connected to the bracket 33. The abutment surface of the bracket 33 abuts against the outer surface of the support 24 to provide auxiliary support to the support 24.

[0045] It should be noted that, when the transformer cable terminal protection device is used, the support 24 is first threadedly installed on the base 11, and the cable terminal is passed from the supporting side of the cable tray 12 through the wire tube 121 to the inner side of the base 11, and then the cable terminal is passed through the second through hole 2171 and the first through hole 241 in sequence, and the excess length of the cable is wound around the sliding sleeve 213, the sealing plate 217 is held to extend the anti-retraction component 23 into the inner sleeve 216, and the sealing plate 217 is rotated until the second swing rod 224 is located on the left side of the protrusion 222 (such as Figure 5 The sealing plate 217 is fixedly connected to the sleeve 213 by means of fastening screws, and the sealing plate 217 is fixedly connected to the inner sleeve 216 by means of fastening screws, and the wiring terminal of the cable passes through the support 24 and the base 11 in turn and is electrically connected to the transformer 1;

[0046] When the worker holds the cable and pulls the cable to lay and fix the cable on the cable bridge 12, the cable part adjacent to the cable terminal is rigidly pulled due to the dragging of the construction workers. Under the clamping action of the clamping block 231, the cable will not withdraw from the inner sleeve 216, and the sealing plate 217 is driven to move right through the anti-retraction component 23 to drive the sliding sleeve 213 to compress the first spring 212, and the elastic deformation of the first spring 212 is used to buffer the pulling force on the cable. In addition, since the cable is wound with a surplus length in the inner sleeve 216, the cable between the clamping position and the cable terminal connection position is flexibly distributed and can be pulled and stretched, thereby avoiding the existing situation that the cable is pulled straight by force, resulting in the loosening of the cable terminal, or even the breakage of the core conductor in the cable.

[0047] Moreover, when the cable is pulled, when the sliding sleeve 213 moves to the right, the excess wound cable stretches out quickly, and the second swing arm 224 is swung toward the direction close to the cable through the resistance of the protrusion 222 to the second swing arm 224, so as to push the cable near the clamping position to unfold, reduce the bending angle of the cable at the clamping position, and reduce the influence of the cable bending on the electrical performance of the cable.

[0048] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A cable terminal protection device for a transformer, characterized in that: include: A base (11), the base (11) being used for fixing and installing a transformer (1), a cable tray (12) being fixedly arranged on one side of the base (11), the cable tray (12) being used for laying and supporting cables led out of the cable connection terminals of the transformer (1); A pulling and buffering mechanism (2), wherein the pulling and buffering mechanism (2) is mounted on a base (11) via a support (24), and the pulling and buffering mechanism (2) is arranged on a side adjacent to a cable connection terminal of a transformer (1), wherein the pulling and buffering mechanism (2) comprises a material-retracting prevention component (23), a buffer component (21), and a pulling and buffering component (22), wherein the material-retracting prevention component (23) is used to prevent the cable from retreating during installation, and the buffer component (21) is mounted on the support (24), and the support (24) is mounted on the base (11). ) and close to the cable connection terminal of the transformer (1), the cable close to the support (24) has a surplus length and is wound and placed on the buffer component (21), the buffer component (21) is used to buffer the tension applied to the cable close to the support (24), the pulling and caressing material component (22) is installed on the anti-backup component (23), and the pulling and caressing material component (22) is transmission-connected to the buffer component (21), and the pulling and caressing material component (22) is used to reduce the bending angle of the cable close to the anti-backup component (23).

2. A transformer cable terminal protection device according to claim 1, characterized in that: A first through hole (241) is formed at a side end of the support (24), and the first through hole (241) is used for passing a cable to be laid; The buffer assembly (21) comprises an outer sleeve (215), an inner sleeve (216), a sealing plate (217), a fixing rod (211), a sliding sleeve (213), a first spring (212) and a sliding block (214); the outer sleeve (215) is fixedly mounted on a support (24); the support (24) is connected to the outer sleeve (215) via a first through hole (241); the inner sleeve (216) is slidably connected to the outer sleeve (215); one end of the inner sleeve (216) away from the support (24) is fixedly connected to the sealing plate (217); and the outer sleeve (215) is located on the outer sleeve (215). A fixing rod (211) is fixedly connected to the support (24) inside the fixing rod (215), the outside of the fixing rod (211) is slidably connected to the sliding sleeve (213), one end of the fixing rod (211) away from the support (24) is fixedly connected to a sliding block (214), the sliding block (214) is located inside the sliding sleeve (213) and is slidably connected to the sliding sleeve (213), a first spring (212) is sleeved on the circumferential side of the fixing rod (211) located inside the sliding sleeve (213), and one end of the sliding sleeve (213) away from the support (24) is fixedly connected to a sealing plate (217); The sealing plate (217) is provided with a second through hole (2171), and the second through hole (2171) is used for passing a cable, and the anti-retraction component (23) is installed on the sealing plate (217) at a position close to the second through hole (2171).

3. A transformer cable terminal protection device according to claim 2, characterized in that: The anti-material-backlash components (23) are provided in multiple groups, and the multiple groups of the anti-material-backlash components (23) are installed on one side of the sealing plate (217) close to the support (24), and the multiple groups of the anti-material-backlash components (23) are evenly distributed around the second through hole (2171).

4. A transformer cable terminal protection device according to claim 3, characterized in that: The anti-material-return assembly (23) comprises a bracket (233), a first swing rod (232), a second spring (234) and a clamping block (231); the bracket (233) is fixedly mounted on the sealing plate (217); one end of the bracket (233) away from the sealing plate (217) is rotatably connected to the first swing rod (232); one end of the first swing rod (232) close to the axis line of the second through hole (2171) is fixedly connected to the clamping block (231); one end of the clamping block (231) away from the first swing rod (232) has an arc convex portion; one end of the first swing rod (232) away from the axis line of the second through hole (2171) is fixedly connected to the second spring (234); one end of the second spring (234) away from the first swing rod (232) is fixedly connected to the bracket (233).

5. A transformer cable terminal protection device according to claim 4, characterized in that: The pulling and stroking material assembly (22) comprises a support rod (221), a protrusion (222), a second swing rod (224) and a third spring (225); a sliding groove (223) is provided on the sliding sleeve (213); a side end of the sliding block (214) is fixedly connected with the support rod (221); the support rod (221) is slidably connected to the sliding sleeve (213) through the sliding groove (223); the support rod (221) passes through the sliding groove (223) to the outside of the sliding sleeve (213) and is fixedly connected with The protrusion (222) is rotatably connected to a second swing rod (224) on a clamping block (231) in a group of anti-material-retraction components (23) close to the sliding sleeve (213); a third spring (225) is fixedly connected to the side of the second swing rod (224) facing the first swing rod (232); an end of the third spring (225) away from the second swing rod (224) is fixedly connected to the first swing rod (232); and a side of the second swing rod (224) away from the first swing rod (232) has an arc convex portion.

6. A transformer cable terminal protection device according to claim 5, characterized in that: A ball is embedded on one side of the arc convex portion of the second swing rod (224).

7. A transformer cable terminal protection device according to claim 5, characterized in that: There are a plurality of the pulling and buffering mechanisms (2), there are a plurality of the first through holes (241), and the first through holes (241) and the pulling and buffering mechanisms (2) are arranged in a one-to-one correspondence.

8. A transformer cable terminal protection device according to claim 6 or 7, characterized in that: The base (11) is also provided with a support assembly, which comprises a knob (31), a screw rod (32) and a bracket (33); the screw rod (32) is threadedly connected to the base (11); one end of the screw rod (32) located outside the base (11) is fixedly connected to the knob (31); one end of the screw rod (32) located inside the base (11) is rotatably connected to the bracket (33); and an abutting surface of the bracket (33) abuts against an outer surface of the support (24).

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