A distribution transformer one-connection three-unmanned connection device

Abstract

The application relates to the technical field of power distribution transformer detection, in particular to a one-connection-three-unmanned connection device of a power distribution transformer, which comprises a sample conveying AGV, a bearing platform, a clamping assembly, a connection robot, a low-voltage connection box, a high-voltage connection box, a support frame, a connection clamp shell and a strain assembly. The strain structure arranged in the fixed-size connection clamp can automatically adjust and clamp according to the size of the connection terminal, can adapt to the detection operation of power distribution transformers of various specifications, can also improve the contact friction between the connection clamp and the upper end face of the power distribution transformer, avoids the problem that the wire gravity drives the connection clamp to loosen or fall off, and thus ensures the detection efficiency.

Description

Technical Field

[0001] This invention relates to the field of power distribution transformer testing technology, specifically a one-to-three unmanned connection device for power distribution transformers. Background Technology

[0002] Distribution transformers are critical equipment in power distribution networks, and their health directly affects the reliability and stability of power supply. Therefore, distribution transformers need to be tested before being put into operation to ensure their normal operation. Currently, the traditional method for testing distribution transformers is manual wiring. However, manual wiring is inefficient and time-consuming, greatly limiting the testing efficiency. In addition, manual wiring is prone to errors, increasing safety hazards. With the continuous development of robotics technology, robotic wiring is gradually being applied.

[0003] Currently, in the process of replacing manual wiring with robots, different power distribution transformers have different specifications, and the sizes of their upper terminals are also different. Traditional wiring clamps, due to their fixed size, are difficult to adapt to different specifications of terminals, which limits the types or specifications of power distribution transformers that can be tested. At the same time, after the wiring clamps are installed, the gravity of the suspended wires may cause the wiring clamps to shift, resulting in loosening or detachment of the wiring, which in turn affects the testing efficiency. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a one-to-three unmanned wiring device for distribution transformers. By setting a strain structure inside a fixed-size wiring clamp that can automatically adjust and hold the terminals according to their dimensions, it can adapt to the testing of various specifications of distribution transformers. At the same time, it can improve the contact friction between the wiring clamp and the upper surface of the distribution transformer, avoiding the problem of the wiring clamp loosening or falling off due to the weight of the conductor, thereby ensuring testing efficiency.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a one-to-three unmanned wiring device for a distribution transformer, including a sample conveying AGV, a carrying platform installed on the upper end of the sample conveying AGV, a clamping assembly provided on the upper end of the carrying platform, a wiring robot provided on the side of the carrying platform, a low-voltage junction box and a high-voltage junction box respectively provided on the side of the carrying platform adjacent to the wiring robot, support frames symmetrically installed on the opposite side walls of the low-voltage junction box and the high-voltage junction box, wiring clamps uniformly arranged on the upper end of the support frames, each wiring clamp being connected to the interior of the low-voltage junction box and the high-voltage junction box through a wire, and a strain component installed inside the wiring clamp.

[0006] Specifically, the clamping assembly includes cylinder slots. Cylinder slots are linearly arranged on the upper surface of the bearing platform. A lifting cylinder is installed in the cylinder slot. A load-bearing plate is fixedly connected to the upper end of the lifting cylinder. A transmission module is provided on the outside of the load-bearing plate. A drive module is fixedly connected to the end of the transmission module. A clamping device is fixedly connected to the upper end of the transmission module.

[0007] Specifically, the drive module includes a servo motor. The servo motor is installed near the edge of the upper surface of the support platform. The output shaft of the servo motor is fixedly connected to a drive pulley. Drive pulleys are symmetrically arranged on both sides of the drive pulley. The driven pulleys and the drive pulleys are connected by an annular belt.

[0008] Specifically, the transmission module includes a limiting slide groove. A limiting slide groove is symmetrically opened on the upper surface of the bearing platform and at a position adjacent to the drive module. A liner is fixedly installed on the side of the limiting slide groove. A threaded rod is rotatably installed between two liners on the same side. The end of the threaded rod is fixedly connected to the driven pulley. Threaded sections are symmetrically opened on the threaded rod. A vertical plate is screwed onto the threaded section. The lower end of the vertical plate is slidably installed at the bottom of the limiting slide groove.

[0009] Specifically, the clamping device is open on opposite sides and has clamping bars symmetrically installed at its upper and lower ends. The upper and lower clamping bars on the same side form a horizontal "V" shaped clamping space.

[0010] Specifically, an insulating ceramic sheet is fixedly installed on the upper end of the support frame at the position corresponding to the wiring clamp.

[0011] Specifically, a spherical groove is provided near the upper end of the wiring clamp, and a rectangular groove is provided at the lower end of the spherical groove. The lower end of the rectangular groove extends to the lower end face of the wiring clamp, and the spherical groove and the rectangular groove form a wiring space.

[0012] Specifically, the strain assembly includes an annular connecting piece. The annular connecting piece is fixedly installed on the concave side wall inside the spherical groove. The wire ends of the annular connecting piece and the wiring clamp are soldered together. An extension groove is opened inside the annular connecting piece. A strain module is slidably installed in the extension groove. A stabilizing module is symmetrically installed inside the wiring clamp and around the rectangular groove. The near end of the stabilizing module abuts against the strain module.

[0013] Specifically, the strain module includes a strain spring, a strain spring is fixedly installed at the top of the extension groove, an "S"-shaped conductive sheet is fixedly connected to the lower end of the strain spring, the "S"-shaped conductive sheet is slidably connected to the inner wall of the extension groove, and the lower end of the "S"-shaped conductive sheet is fixedly connected to the side wall of the rectangular groove.

[0014] Specifically, the “S”-shaped conductive sheet has evenly spaced balls on both sides near the middle section and inside the extension groove to improve the smoothness of the “S”-shaped conductive sheet movement.

[0015] Specifically, the stabilizing module includes a mounting slot. The mounting slot is symmetrically provided inside the wiring clamp and around the rectangular slot. A tension spring is fixedly installed at the top of the mounting slot. A wedge block is fixedly installed at the lower end of the tension spring. A stabilizing plate is fixedly connected to the lower end of the wedge block. A "T"-shaped plate is slidably provided through the side wall of the rectangular slot. One end of the "T"-shaped plate slides in contact with the slope surface of the wedge block, and the other end abuts against the "S"-shaped conductive sheet.

[0016] Specifically, both the "T"-shaped plate and the stabilizing plate are made of insulating material, and the lower end surface of the stabilizing plate is uniformly provided with friction protrusions.

[0017] The beneficial effects of this invention are: The clamping assembly can clamp and fix multiple distribution transformers simultaneously before they are transported to the work station, avoiding their displacement during movement and facilitating their rapid transport to the designated work station, thus ensuring testing efficiency. The strain module installed in the wiring clamp can automatically adjust the clamping space according to the size of the wiring terminals and ensure the clamping fixation, adapting to the testing of various specifications of distribution transformers, improving the flexibility of the one-to-three unmanned wiring device for distribution transformers during use, and expanding the testing range. The stabilizing module can use the squeezing force between the terminal block and the strain module to push the stabilizing plate downward and tightly adhere it to the upper surface of the distribution transformer, thereby increasing the friction between the two and avoiding the problem of the terminal clamp shifting due to the gravity of the suspended conductor, thus ensuring the stability and smoothness of the testing process. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is the present invention. Figure 1 A three-dimensional structural diagram after removing the distribution transformer; Figure 3 This is a schematic diagram of the three-dimensional connection structure between the support platform and the clamping assembly in this invention; Figure 4 This is a cross-sectional structural diagram of the clamping device in this invention; Figure 5 This is a schematic diagram of the three-dimensional connection structure between the support frame and the wiring clamp in this invention; Figure 6 In this invention Figure 7 A schematic diagram of the cross-sectional structure; Figure 7 This is a cross-sectional view of the wiring clamp and strain assembly in this invention. Figure 8 In this invention Figure 7 A magnified structural diagram at point A; Figure 9 In this invention Figure 7 A magnified structural diagram at point B; Figure 10 In this invention Figure 7 A magnified structural diagram at point C.

[0020] In the picture: 1. Sample transport AGV; 2. Carrying platform; 3. Clamping assembly; 31. Cylinder slot; 32. Lifting cylinder; 33. Load-bearing plate; 34. Drive module; 341. Servo motor; 342. Drive pulley; 343. Driven pulley; 344. Annular belt; 35. Transmission module; 351. Limiting groove; 352. Vertical plate; 353. Liner plate; 354. Threaded rod; 36. Clamping device; 361. Clamping bar; 4. Wiring robot; 5. Low-voltage junction box; 6. High-voltage junction box; 7. Support frame; 71. Insulating ceramic sheet; 8. Wiring clamp; 81. Spherical groove; 82. Rectangular groove; 9. Strain gauge assembly; 91. Annular connector; 92. Extension groove; 93. Strain gauge module; 931. Strain spring; 932. “S”-shaped conductive sheet; 9321. Ball bearing; 94. Stabilizing module; 941. Mounting slot; 942. Tension spring; 943. Wedge block; 944. "T" shaped plate; 945. Stabilizing plate. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0022] Example 1:

[0023] See Figures 1 to 4 A three-way unmanned wiring device for a power distribution transformer includes a sample conveying AGV1, a carrying platform 2 installed on the upper end of the sample conveying AGV1, a clamping assembly 3 installed on the upper end of the carrying platform 2, a wiring robot 4 installed on the side of the carrying platform 2, and a low-voltage junction box 5 and a high-voltage junction box 6 respectively installed on the side of the carrying platform 2 adjacent to the wiring robot 4.

[0024] The clamping assembly 3 includes a cylinder slot 31. The upper surface of the bearing platform 2 has cylinder slots 31 arranged linearly. A lifting cylinder 32 is installed in the cylinder slot 31. A load-bearing plate 33 is fixedly connected to the upper end of the lifting cylinder 32. A transmission module 35 is provided on the outside of the load-bearing plate 33. A drive module 34 is fixedly connected to the end of the transmission module 35. A clamping device 36 is fixedly connected to the upper end of the transmission module 35.

[0025] The drive module 34 includes a servo motor 341. The servo motor 341 is installed on the upper surface of the support platform 2 near the edge. The output shaft of the servo motor 341 is fixedly connected to a drive pulley 342. Drive pulleys 343 are symmetrically arranged on both sides of the drive pulley 342. The driven pulleys 343 and the drive pulley 342 are connected by an annular belt 344.

[0026] The transmission module 35 includes a limiting groove 351. The limiting groove 351 is symmetrically opened on the upper surface of the bearing platform 2 and on the side adjacent to the drive module 34. A liner 353 is fixedly installed on the side of the limiting groove 351. A threaded rod 354 is rotatably installed between the two liner plates 353 on the same side. The end of the threaded rod 354 is fixedly connected to the driven pulley 343. Threaded sections are symmetrically opened on the threaded rod 354. A vertical plate 352 is screwed onto the threaded section. The lower end of the vertical plate 352 is slidably installed at the bottom of the limiting groove 351.

[0027] The clamping device 36 is open on opposite sides and has clamping strips 361 symmetrically installed at its upper and lower ends. The two clamping strips 361 on the same side form a horizontal "V" shaped clamping space.

[0028] It should be noted that, in this embodiment, the length of the grounding flat iron at the lower end of the distribution transformer is greater than the width of the load-bearing plate 33 in this invention.

[0029] In practice, the distribution transformers are first suspended from the top of the load-bearing plate 33 using existing hoisting equipment, so that the edges of two adjacent distribution transformers are close together, and the grounding flat iron ends of the lower ends of the distribution transformers are exposed on the side of the load-bearing plate 33, ultimately forming a configuration as shown in the image. Figure 1As shown in the diagram, activating the lifting cylinder 32 causes the load-bearing plate 33 and the power distribution transformer on its upper end to move slowly upwards. Simultaneously, activating the servo motor 341 drives the drive pulley 342 and the annular belt 344 to rotate, which in turn drives the driven pulley 343 and the threaded rod 354 to rotate. Under the action of the limit slide 351, the upright plate 352 causes the clamps 36 on both sides to move closer together. The lifting cylinder 32 adjusts the height of the grounding flat iron at the lower end of the power distribution transformer to the middle of the inner side of the clamp 36, and finally, the clamp 36 secures the grounding flat iron. The sample conveying AGV1 is used to limit and fix the distribution transformer. As the "eight" shaped clamping space moves towards the grounding flat iron, the squeezing force between the upper and lower clamping bars 361 and the grounding flat iron will continuously increase, thereby achieving the purpose of rapid clamping and avoiding wear on the end of the grounding flat iron. After the distribution transformer is limited and fixed, the sample conveying AGV1 can drive the bearing platform 2 to rise. At this time, the lower end of the bearing platform 2 is off the ground. The sample conveying AGV1 drives the bearing platform 2 and the clamped distribution transformer to the testing position between the low-voltage junction box 5 and the high-voltage junction box 6 according to the specified route.

[0030] Example 2:

[0031] The technical solution is basically the same as that in Embodiment 1, see below. Figure 1 , Figure 2 as well as Figures 5 to 10 The difference is that: support frames 7 are symmetrically installed on the opposite side walls of the low-voltage junction box 5 and the high-voltage junction box 6, and wiring clamps 8 are evenly arranged on the upper end of the support frame 7. Each wiring clamp 8 is connected to the interior of the low-voltage junction box 5 and the high-voltage junction box 6 through a wire, and a strain component 9 is installed inside the wiring clamp 8.

[0032] An insulating ceramic sheet 71 is fixedly installed on the upper end of the support frame 7 at the position corresponding to the wiring clamp 8.

[0033] The wiring clamp 8 has a spherical groove 81 near the upper end inside, and a rectangular groove 82 at the lower end of the spherical groove 81. The lower end of the rectangular groove 82 extends to the lower end face of the wiring clamp 8, and the spherical groove 81 and the rectangular groove 82 form a wiring space.

[0034] The strain assembly 9 includes an annular connecting piece 91. The annular connecting piece 91 is fixedly installed on the concave side wall inside the spherical groove 81. The wire ends of the annular connecting piece 91 and the wiring clamp 8 are soldered together. An extension groove 92 is opened inside the annular connecting piece 91. A strain module 93 is slidably installed in the extension groove 92. A stabilizing module 94 is symmetrically installed inside the wiring clamp 8 and around the rectangular groove 82. The near end of the stabilizing module 94 abuts against the strain module 93.

[0035] The strain module 93 includes a strain spring 931. The strain spring 931 is fixedly installed on the top of the extension groove 92. An "S"-shaped conductive sheet 932 is fixedly connected to the lower end of the strain spring 931. The "S"-shaped conductive sheet 932 is slidably connected to the inner wall of the extension groove 92.

[0036] The “S”-shaped conductive sheet 932 has ball bearings 9321 evenly arranged on both sides near the middle section and inside the extension groove 92 to improve the smoothness of the “S”-shaped conductive sheet 932 when moving.

[0037] The stabilizing module 94 includes a mounting groove 941. The mounting groove 941 is symmetrically provided inside the wiring clamp 8 and around the rectangular groove 82. A tension spring 942 is fixedly installed on the top of the mounting groove 941. A wedge block 943 is fixedly installed on the lower end of the tension spring 942. A stabilizing plate 945 is fixedly connected to the lower end of the wedge block 943. A "T" shaped plate 944 is slidably provided through the side wall of the rectangular groove 82. One end of the "T" shaped plate 944 slides in contact with the slope surface of the wedge block 943, and the other end abuts against the "S" shaped conductive sheet 932.

[0038] Both the "T"-shaped plate 944 and the stabilizing plate 945 are made of insulating material, and the lower end surface of the stabilizing plate 945 is uniformly provided with friction protrusions.

[0039] In actual operation, the power switch of the wiring robot 4 is turned on. At this time, the wiring robot 4 can automatically identify the position of the wiring terminals of the distribution transformer. Then, according to the three-dimensional vision positioning system, the wiring clamp 8 is clamped and placed on the outside of the corresponding wiring terminals of the distribution transformer. The low-voltage junction box 5 and the high-voltage junction box 6 are powered on to complete the detection of the distribution transformer. After the detection is completed, the wiring robot 4 resets the wiring clamp 8. Wiring Robot 4 is a medium-strength industrial robot, and its specific technical parameters are as follows: Model: ICR30015-SV; AGV chassis diameter: 1000mm; Maximum reach: 3.0m; Navigation speed: ≤1.2m / s; Navigation accuracy: ±0.05mm; Working load: 3-25kg; Repeatability: ±0.02mm—0.05mm; Drive type: Four-wheel differential; Operational accuracy: ±0.2mm plus 3D vision / ±0.05mm plus 2D vision.

[0040] During the contact process between the terminal block 8 and the distribution transformer terminal, the distribution transformer terminal will squeeze the "S"-shaped conductive piece 932, thereby causing the upper end of the "S"-shaped conductive piece 932 to move into the extension groove 92 and compress the strain spring 931. At the same time, the "S"-shaped conductive piece 932 will squeeze the "T"-shaped plate 944. Through the squeezing of the wedge block 943 by the "T"-shaped plate 944, the wedge block 943 will move downward, and finally the lower end face of the stabilizing plate 945 will be attached to the upper shell surface of the distribution transformer. At this time, the distribution transformer terminal, the wire of the terminal block 8, the annular connecting piece 91 and the "S"-shaped conductive piece 932 are connected. The friction protrusions provided on the lower end face of the stabilizing plate 945 can increase the friction between the terminal block 8 and the distribution transformer shell, thereby avoiding the problem of the terminal block 8 loosening due to the gravity of the wire. At the same time, the design of the "S"-shaped conductive piece 932 can make the terminal block 8 adaptable to different specifications of terminal blocks, thereby increasing the types of distribution transformer testing.

[0041] The working principle of this invention during use: First, use existing hoisting equipment to suspend the distribution transformers onto the upper part of the load-bearing plate 33, so that the edges of two adjacent distribution transformers are close together, and the grounding flat iron end of the lower end of the distribution transformer is exposed on the side of the load-bearing plate 33, ultimately forming a shape as shown in the image. Figure 1 As shown in the diagram, activating the lifting cylinder 32 causes the load-bearing plate 33 and the power distribution transformer on its upper end to move slowly upwards. Simultaneously, activating the servo motor 341 drives the drive pulley 342 and the annular belt 344 to rotate, which in turn drives the driven pulley 343 and the threaded rod 354 to rotate. Under the action of the limit slide 351, the upright plate 352 causes the clamps 36 on both sides to move closer together. The lifting cylinder 32 adjusts the height of the grounding flat iron at the lower end of the power distribution transformer to the middle of the inner side of the clamp 36, and finally, the clamp 36 secures the grounding flat iron. The sample conveying AGV1 is used to limit and fix the distribution transformer. As the "eight" shaped clamping space moves towards the grounding flat iron, the squeezing force between the upper and lower clamping bars 361 and the grounding flat iron will increase, thereby achieving the purpose of quick clamping and avoiding wear on the end of the grounding flat iron. After the distribution transformer is limited and fixed, the sample conveying AGV1 can drive the bearing platform 2 to rise. At this time, the lower end of the bearing platform 2 is off the ground. The sample conveying AGV1 drives the bearing platform 2 and the clamped distribution transformer to the testing position between the low-voltage junction box 5 and the high-voltage junction box 6 according to the specified route. 2. Turn on the power switch of the wiring robot 4. At this time, the wiring robot 4 can automatically identify the position of the wiring terminals of the distribution transformer. Then, according to the three-dimensional vision positioning system, it will clamp the wiring clip 8 and put it on the outside of the corresponding wiring terminals of the distribution transformer. Thirdly, during the contact process between the wiring clamp 8 and the distribution transformer terminal, the distribution transformer terminal will squeeze the "S"-shaped conductive piece 932, thereby driving the upper end of the "S"-shaped conductive piece 932 to move into the extension groove 92 and compressing the strain spring 931. At the same time, the "S"-shaped conductive piece 932 will squeeze the "T"-shaped plate 944. Through the squeezing of the wedge block 943 by the "T"-shaped plate 944, the wedge block 943 will move downward, and finally drive the lower end face of the stabilizing plate 945 to adhere to the upper outer shell surface of the distribution transformer. At this time, the distribution transformer terminal, the wire of the wiring clamp 8, the annular connecting piece 91 and the "S"-shaped conductive piece 932 are connected. The friction protrusions set on the lower end face of the stabilizing plate 945 can increase the friction between the wiring clamp 8 and the outer shell of the distribution transformer, thereby avoiding the problem of the wiring clamp 8 loosening due to the gravity of the wire. At the same time, the design of the "S"-shaped conductive piece 932 can make the wiring clamp 8 adapt to different specifications of wiring terminals, thereby increasing the types of distribution transformer testing. Fourth: Power on the low-voltage junction box 5 and the high-voltage junction box 6 to complete the test of the distribution transformer. After the test is completed, the wiring robot 4 resets the wiring clamp 8.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A one-to-three unmanned connection device for a distribution transformer, characterized in that, include: Sample transport AGV (1); The sample conveying AGV (1) is equipped with a carrying platform (2). Clamping assembly (3), the upper end of the bearing platform (2) is provided with clamping assembly (3); Wiring robot (4), the side of the carrying platform (2) is provided with wiring robot (4); Low-voltage junction box (5) and high-voltage junction box (6) are respectively provided on the side of the bearing platform (2) adjacent to the wiring robot (4). Support frame (7) is symmetrically installed on the opposite side walls of the low-voltage junction box (5) and the high-voltage junction box (6). Wiring clamps (8), the upper end of the support frame (7) is evenly provided with wiring clamps (8), each wiring clamp (8) is connected to the inside of the low voltage junction box (5) and the high voltage junction box (6) through wires; The strain assembly (9) is installed inside the wiring clamp (8). The strain assembly (9) includes an annular connecting piece (91), a strain module (93), and a stabilizing module (94). The strain module (93) is used to compensate for the axial displacement of the wiring terminals during the wiring process. The stabilizing module (94) is used to clamp and fix the terminal according to the movement state of the strain module (93); the clamping assembly (3) includes a cylinder groove (31), the upper end face of the bearing platform (2) is provided with a cylinder groove (31) arranged linearly, a lifting cylinder (32) is installed in the cylinder groove (31), a load-bearing plate (33) is fixedly connected to the upper end of the lifting cylinder (32), a transmission module (35) is provided on the outside of the load-bearing plate (33), a drive module (34) is fixedly connected to the end of the transmission module (35), and a clamping device (36) is fixedly connected to the upper end of the transmission module (35); the clamping device (36) is open on the opposite side and clamping strips (361) are symmetrically installed at the upper and lower ends inside, and a horizontal "eight" shaped clamping space is formed between the upper and lower clamping strips (361) on the same side. The wiring clamp (8) has a spherical groove (81) near the upper end, and a rectangular groove (82) at the lower end of the spherical groove (81). The lower end of the rectangular groove (82) extends to the lower end face of the wiring clamp (8), and the spherical groove (81) and the rectangular groove (82) form a wiring space. The wire ends of the annular connector (91) and the wiring clamp (8) are soldered by soldering. An extension groove (92) is provided inside the annular connector (91). A strain module (93) is slidably installed in the extension groove (92). A stabilizing module (94) is symmetrically installed inside the wiring clamp (8) and around the rectangular groove (82). The near end of the stabilizing module (94) abuts against the strain module (93). The strain module (93) includes a strain spring (931), the strain spring (931) is fixedly installed on the top of the extension groove (92), the lower end of the strain spring (931) is fixedly connected to an "S" shaped conductive sheet (932), the "S" shaped conductive sheet (932) is slidably connected to the inner wall of the extension groove (92), and the lower end of the "S" shaped conductive sheet (932) is fixedly connected to the side wall of the rectangular groove (82); The "S"-shaped conductive sheet (932) has rolling balls (9321) evenly arranged on both sides near the middle section and inside the extension groove (92) to improve the smoothness of the movement of the "S"-shaped conductive sheet (932). The stabilizing module (94) includes a mounting groove (941). The mounting groove (941) is symmetrically provided inside the wiring clamp (8) and around the rectangular groove (82). A tension spring (942) is fixedly installed on the top of the mounting groove (941). A wedge block (943) is fixedly installed at the lower end of the tension spring (942). A stabilizing plate (945) is fixedly connected to the lower end of the wedge block (943). A "T" shaped plate (944) is slidably provided through the side wall of the rectangular groove (82). One end of the "T" shaped plate (944) slides in contact with the slope of the wedge block (943), and the other end abuts against the "S" shaped conductive sheet (932).

2. The unmanned connection device for a distribution transformer with one connection to three terminals as described in claim 1, characterized in that: The drive module (34) includes a servo motor (341). The servo motor (341) is installed on the upper surface of the support platform (2) near the edge. The output shaft of the servo motor (341) is fixedly connected to a drive pulley (342). Drive pulleys (343) are symmetrically arranged on both sides of the drive pulley (342). The driven pulleys (343) and the drive pulleys (342) are connected by an annular belt (344).

3. The unmanned connection device for a distribution transformer with one connection to three terminals as described in claim 2, characterized in that: The transmission module (35) includes a limiting groove (351). A limiting groove (351) is symmetrically opened on the upper surface of the bearing platform (2) and at a position adjacent to the drive module (34). A liner (353) is fixedly installed on the side of the limiting groove (351). A threaded rod (354) is rotatably installed between the two liners (353) on the same side. The end of the threaded rod (354) is fixedly connected to the driven pulley (343). Threaded sections are symmetrically opened on the threaded rod (354). A vertical plate (352) is screwed onto the threaded section. The lower end of the vertical plate (352) is slidably installed at the bottom of the limiting groove (351).

4. The unmanned connection device for a distribution transformer with one connection to three terminals as described in claim 1, characterized in that: An insulating ceramic sheet (71) is fixedly installed on the upper end of the support frame (7) at the position corresponding to the wiring clamp (8).

5. The unmanned connection device for a distribution transformer with one connection to three terminals according to claim 1, characterized in that: The "T"-shaped plate (944) and the stabilizing plate (945) are both made of insulating material and the lower end surface of the stabilizing plate (945) is uniformly provided with friction protrusions.

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