Liquid-filled insulating porcelain sleeve terminal for cross-linked polyethylene insulated power cable

Abstract

The invention belongs to the technical field of insulating porcelain sleeves, and particularly discloses a liquid-filled insulating porcelain sleeve terminal for a cross-linked polyethylene insulated power cable, which comprises a wire outlet clamp, a flange, a stress cone, a porcelain sleeve and an insulator, the wire outlet clamp is arranged at the top end of the stress cone, the flange is arranged on a bottom plate through a plurality of screws, and the porcelain sleeve is arranged on the flange. The bottom surface of the bottom plate is connected with a mounting plate through a plurality of insulators; and the flange is provided with a supporting assembly for supporting the porcelain sleeve. According to the invention, through the buckling cooperation of the notches and the edge clamping frames, rotating sleeves with different shapes can be conveniently installed at the bottom of the positioning plate, through the spiral cooperation of the screw sleeves and the vertical rods, the square and round rods can be conveniently moved upwards by the side frames through the annular edges, and the porcelain sleeves are limited by the square and round rods, so that the multiple porcelain sleeves are sequentially arranged end to end; and the plurality of porcelain sleeves are fastened between the two flanges, so that the situation that the plurality of porcelain sleeves are loosened is avoided, and the fastening effect of the plurality of porcelain sleeves is further improved.

Description

Technical Field

[0001] This invention belongs to the field of insulating porcelain bushing technology, and specifically relates to a liquid-filled insulating porcelain bushing terminal for cross-linked polyethylene insulated power cables. Background Technology

[0002] Insulating porcelain bushing terminals in cable accessories can be connected to electrical equipment such as transformers and distribution boxes, and are widely used, playing a key role in the connection of power cables.

[0003] The porcelain sleeve on the terminal surface of the insulating porcelain sleeve is fitted onto the outside of the porcelain bottle body. Due to the different shapes of the porcelain bottles body, multiple sets of insulating porcelain sleeves with different shapes need to be fitted onto the outside of the porcelain bottle body. After installation, the insulating porcelain sleeve may separate or shake due to vibration.

[0004] Therefore, it is necessary to invent a liquid-filled insulating porcelain bushing terminal for cross-linked polyethylene insulated power cables to solve the above problems. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a liquid-filled insulating porcelain bushing terminal for cross-linked polyethylene insulated power cables, thereby resolving the issues raised in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a liquid-filled insulating porcelain bushing terminal for cross-linked polyethylene insulated power cables, comprising a lead clamp, a flange, a stress cone, a porcelain bushing, and insulators. The lead clamp is installed at the top of the stress cone. The flange is installed on a base plate using multiple screws, and a mounting plate is connected to the bottom surface of the base plate using multiple insulators. A support assembly for supporting the porcelain bushing is provided on the flange. The support assembly includes: a square-round rod penetrating the flange and the base plate for supporting the bottom of the porcelain bushing; a positioning plate installed on the bottom surface of the base plate using a support rod, with the square-round rod penetrating the center of the positioning plate; a rotating sleeve spirally sleeved on the surface of the square-round rod for driving the square-round rod to move up and down; and a clamping frame fixed to the bottom surface of the positioning plate, with the rotating sleeve rotatably sleeved on the outside of the clamping frame.

[0007] Furthermore, the rotating sleeve is provided with an inner ring groove, which allows the rotating sleeve to rotate on the outside of the clamping frame.

[0008] Furthermore, the positioning plate utilizes an extraction component to move the rotating sleeve up and down. The extraction component includes a side frame, a vertical rod, and a screw sleeve. Side frames are provided on both sides of the rotating sleeve, and a ring edge corresponding to the side frame is provided on the outer circumference of the rotating sleeve. The side frame is located at the bottom of the ring edge. The top surface of the side frame is penetrated by the vertical rod through the positioning plate, and a screw sleeve is spirally sleeved at the top of the vertical rod.

[0009] Furthermore, the side frame utilizes a ring edge to define the rotating sleeve, and the inner top surface of the inner ring groove is hooked onto the outer side of the side frame.

[0010] Furthermore, the positioning plate has a groove on its surface corresponding to the vertical rod, the vertical rod passes through the groove vertically, and a pressure plate is sleeved on the surface of the vertical rod. The pressure plate is located at the bottom of the screw sleeve, the bottom surface of the pressure plate is provided with a locking tooth, and the top surface of the positioning plate is provided with a toothed rack corresponding to the locking tooth.

[0011] Furthermore, both sides of the positioning plate are slidably fitted with outer frames, and the outer frames slide on the surface of the positioning plate using two inner strips, with the bottom surface of the pressure plate abutting against the top surface of the top inner strip.

[0012] Furthermore, a square rod is fixed to the top surface of the inner side of the outer frame, with the bottom end of the square rod vertically inserted into the top of the vertical rod.

[0013] Furthermore, a plug rod is horizontally inserted at the center of the side frame, and a fastening sleeve is spirally sleeved on the outer end of the plug rod.

[0014] Furthermore, the insertion rod is provided with side plates on both sides, and the side frame is provided with an inner groove corresponding to the side plate. An inner rod is provided inside the inner groove, and an elastic element is sleeved on the surface of the inner rod. The elastic force of the elastic element causes the inner end of the insertion rod to abut against the outer surface of the rotating sleeve circumference.

[0015] Furthermore, the inner side of the fastening sleeve is tightly attached to the outer side of the side frame.

[0016] The technical effects and advantages of this invention are as follows: 1. This invention facilitates the installation of rotating sleeves of different shapes at the bottom of the positioning plate by using the snap-fit ​​between the slot and the clamping frame. The screw sleeve and the vertical rod are screwed together to facilitate the side frame to move the square and round rods upward through the ring edge. The square and round rods limit the porcelain sleeves, so that the ends of multiple porcelain sleeves are set in sequence, and multiple porcelain sleeves are fastened between the two flanges, avoiding the loosening of multiple porcelain sleeves and further improving the fastening effect of multiple porcelain sleeves.

[0017] 2. The present invention uses the elastic force of the elastic element to make the inner end of the insert rod abut against the outer side of the circumference of the rotating sleeve. The insertion rod limits the rotating sleeve from rotating arbitrarily outside the two clamping frames, thus ensuring the stability of the square and round rod supporting the ceramic sleeve. Attached Figure Description

[0018] Figure 1 This is an overall schematic diagram of the liquid-filled insulating porcelain bushing terminal for cross-linked polyethylene insulated power cables according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the support component of this invention supporting the ceramic sleeve using a square and round rod; Figure 3 This is a three-dimensional cross-sectional schematic diagram of the positioning plate and rotating sleeve according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the vertical rod bottom end connecting to the side frame according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the overall pressure plate according to an embodiment of the present invention; In the diagram: 1. Outgoing clamp; 2. Flange; 3. Stress cone; 4. Porcelain bushing; 5. Insulator; 6. Base plate; 7. Mounting plate; 8. Square / round rod; 9. Positioning plate; 901. Support rod; 902. Rack; 10. Rotary sleeve; 11. Edge clamping frame; 111. Groove; 12. Inner ring groove; 13. Side frame; 14. Vertical rod; 15. Screw sleeve; 16. Ring edge; 17. Pressure plate; 171. Clamping tooth; 18. Outer frame; 181. Square rod; 19. Insert rod; 20. Fastening sleeve; 21. Side plate; 22. Elastic element. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0020] This invention provides a liquid-filled insulating porcelain bushing terminal for cross-linked polyethylene insulated power cables, such as... Figure 1 and Figure 2 As shown, it includes a wire clamp 1, a flange 2, a stress cone 3, a porcelain bushing 4, and an insulator 5. The wire clamp 1 is installed on the top of the stress cone 3. The flange 2 is installed on the base plate 6 with multiple screws, and the bottom surface of the base plate 6 is connected to the mounting plate 7 with multiple insulators 5.

[0021] Specifically, flange 2 is installed at the top and bottom of porcelain sleeve 4. Flange 2 is made of corrosion-resistant aluminum alloy. Stress cone 3 is installed at the top of porcelain sleeve 4 using flange 2. Stress cone 3 is made of high-performance silicone rubber to provide electric field stress control. The inside of porcelain sleeve 4 is filled with polyisobutylene to strengthen the external insulation. Flange 2 at the bottom uses a wire to pass through the center of base plate 6. Base plate 6 is installed on top of mounting plate 7 using insulator 5. Mounting plate 7 is fixed to the ground.

[0022] To support the porcelain bushing 4, a support assembly is used to prevent multiple sets of porcelain bushings 4 from separating from each other. Figures 2 to 4 In the middle, the flange 2 is provided with a support assembly for supporting the porcelain sleeve 4. The support assembly includes: a square rod 8, a positioning plate 9, a rotating sleeve 10, and a clamping bracket 11. Multiple square rods 8 penetrate the bottom flange 2 and the surface of the base plate 6. The top of the square rod 8 abuts against the bottom surface of the porcelain sleeve 4. The bottom end of the square rod 8 is spirally sleeved with the rotating sleeve 10. The center of the positioning plate 9 is slidably sleeved on the surface of the square rod 8 using a square groove. The top surfaces of both ends of the positioning plate 9 are connected to the bottom surface of the base plate 6 by support rods 901. Two opposing clamping brackets 11 are fixed on the bottom surface of the positioning plate 9. The rotating sleeve 10 is rotatably sleeved on the outside of the two clamping brackets 11.

[0023] Specifically, the base plate 6 uses the support rod 901 to limit the positioning plate 9. The rotating sleeve 10 is rotated, and the positioning plate 9 uses two clamping brackets 11 to limit the rotating sleeve 10. The rotating sleeve 10 causes the square and round rod 8 to move upward. The top of the upward-moving square and round rod 8 abuts against the bottom surface of the porcelain sleeve 4. The rotating sleeve 10 uses the square and round rod 8 to limit the porcelain sleeve 4, so that the multiple porcelain sleeves 4 are arranged end to end in sequence, so that the multiple porcelain sleeves 4 are fastened between the two flanges 2, and the multiple porcelain sleeves 4 are prevented from becoming loose.

[0024] To limit the rotating sleeve 10, the extraction component is used to support the rotating sleeve 10. Figure 3 and Figure 4 In the middle, the rotating sleeve 10 is provided with an inner ring groove 12. The rotating sleeve 10 rotates on the outside of the clamping frame 11 using the inner ring groove 12. At this time, the rotating sleeve 10 moves up and down on the outside of the clamping frame 11 using the inner ring groove 12. The top of the inner ring groove 12 is provided with a slot 111 corresponding to the clamping frame 11. The positioning plate 9 uses an extraction component to make the rotating sleeve 10 move up and down. The extraction component includes: a side frame 13, a vertical rod 14 and a screw sleeve 15. Side frames 13 are provided on both sides of the rotating sleeve 10, and the outer circumference of the rotating sleeve 10 is provided with a ring edge 16 corresponding to the side frame 13. The side frame 13 is located at the bottom of the ring edge 16. The top surface of the side frame 13 is penetrated by the vertical rod 14 through the positioning plate 9. The surface of the positioning plate 9 is provided with a sliding groove corresponding to the vertical rod 14. The vertical rod 14 passes vertically through the sliding groove, and the top of the vertical rod 14 is spirally sleeved with a screw sleeve 15. The side frame 13 uses the ring edge 16 to limit the rotating sleeve 10, and the inner top surface of the inner ring groove 12 is hooked to the outside of the side frame 11.

[0025] Specifically, loosening the threaded sleeve 15 causes the weight of the side frame 13 to move the vertical rod 14 downwards inside the slide groove, pushing the side frame 13 outwards. The outward movement of the side frame 13 causes the vertical rod 14 to move outwards inside the slide groove. As the outward-moving side frame 13 gradually moves away from the rotating sleeve 10, the side frame 13 can no longer use the ring edge 16 to restrain the rotating sleeve 10. At this point, the square-round rod 8 causes the rotating sleeve 10 to move downwards outside the two edge-clamping frames 11 until the inner top surface of the inner ring groove 12 hooks onto the outer side of the two edge-clamping frames 11. Rotating the rotating sleeve 10 allows it to rotate outside the edge-clamping frames 11 using the inner ring groove 12 until the groove opening 111 aligns with the edge-clamping frame 11, making it easy to remove the rotating sleeve 10 from the outer side of the two edge-clamping frames 11.

[0026] A suitable rotating sleeve 10 is fitted onto the outside of two clamping brackets 11 using the slot 111. Multiple ceramic sleeves 4 are aligned end to end. Since the rotating sleeve 10 uses the inner ring groove 12 to limit the clamping brackets 11, the rotating sleeve 10 causes the square rod 8 to move upward until the top of the square rod 8 touches the bottom surface of the ceramic sleeve 4, completing the initial limitation of the multiple ceramic sleeves 4. The side bracket 13 is pushed closer to the rotating sleeve 10, and the inwardly moving side bracket 13 gradually fits against the outer circumference of the rotating sleeve 10. The screw sleeve 15 is rotated, and the rotating screw sleeve 15 causes the vertical rod 14 to move upward inside the sliding groove. The upwardly moving vertical rod 14 causes the side bracket 13 to move upward on the surface of the rotating sleeve 10 until the top surface of the side bracket 13 touches the bottom surface of the ring edge 16. At this time, the side bracket 13 continues to move upward, and the ring edge 16 causes the rotating sleeve 10 to move upward. The rotating sleeve 10 continues to press the bottom surface of the ceramic sleeve 4 using the square rod 8. At this time, the rotating sleeve 10 moves upward on the surface of the clamping bracket 11 using the inner ring groove 12.

[0027] In this embodiment, the slot 111 and the snap-fit ​​bracket 11 make it easy to install rotating sleeves 10 of different shapes at the bottom of the positioning plate 9, and the screw sleeve 15 and the vertical rod 14 make it easy for the side frame 13 to move the square and round rods 8 upward through the ring edge 16, thereby further improving the fastening effect of multiple ceramic sleeves 4.

[0028] To enhance the restraining effect of the side frame 13 on the rotating sleeve 10, the vertical rod 14 is restrained by the cooperation of the clamp 171 and the rack 902. Figures 3 to 5 In the middle, a pressure plate 17 is sleeved on the surface of the vertical rod 14, and the pressure plate 17 is located at the bottom of the screw sleeve 15. The bottom surface of the pressure plate 17 is provided with a retaining tooth 171, and the top surface of the positioning plate 9 is provided with a rack 902 corresponding to the retaining tooth 171. The positioning plate 9 is slidably fitted with an outer frame 18 on both sides. The outer frame 18 is generally square in shape. The two inner side walls of the outer frame 18 are provided with two inner strips. The two inner strips are snapped onto the outside of the positioning plate 9. The outer frame 18 slides on the surface of the positioning plate 9 using the two inner strips. The bottom surface of the pressure plate 17 abuts against the top surface of the top inner strip. A square rod 181 is fixed on the top surface of the inner side of the outer frame 18. The bottom end of the square rod 181 is vertically inserted into the top of the vertical rod 14.

[0029] Specifically, pulling the screw sleeve 15 causes the side frame 13 to move upward using the vertical rod 14 until the top surface of the side frame 13 is in contact with the bottom surface of the ring edge 16. Pulling the pressure plate 17 upward causes the pressure plate 17 to move upward on the surface of the vertical rod 14. At this time, the locking teeth 171 at the bottom of the pressure plate 17 move away from the rack 902, pushing the side frame 13 inward. The side frame 13 causes the vertical rod 14 to move inward inside the slide groove until the inner end face of the side frame 13 is in contact with the outer circumference of the rotating sleeve 10. Then, the tension applied to the screw sleeve 15 is released, and the side frame 13 causes the screw sleeve 15 and the pressure plate 17 to move downward using the vertical rod 14. The bottom surface of the pressure plate 17 is in contact with the top surface of the inner strip at the top. At this time, the bottom surface of the pressure plate 17 is locked onto the top of the rack 902 using the locking teeth 171.

[0030] Rotating the screw sleeve 15 causes the vertical rod 14 to move upward inside the slide groove. The side frame 13 at the bottom of the vertical rod 14 uses the ring edge 16 to limit the rotating sleeve 10. The square rod 8 uses the ring edge 16 of the rotating sleeve 10 to limit the pressure plate 17 at the top of the vertical rod 14, preventing the outer frame 18 from sliding arbitrarily on the surface of the positioning plate 9.

[0031] In this embodiment, the screw sleeve 15 and the vertical rod 14 are screwed together, which in turn makes the locking tooth 171 and the rack 902 snap together. This allows the side frame 13 to use the ring edge 16 to limit the support sleeve 10 and prevent the sleeve 10 from swaying up and down on the outside of the side frame 11.

[0032] To enhance the limiting effect of the rotating sleeve 10 on the outside of the clamping frame 11, the rotating sleeve 10 is limited by the insert rod 19. Figure 3 and Figure 4 In the middle, a rod 19 is horizontally inserted at the center of the side frame 13, and a fastening sleeve 20 is screwed onto the outer end of the rod 19. Side plates 21 are provided on both sides of the rod 19. The side frame 13 has an inner groove corresponding to the side plate 21. An inner rod is provided inside the inner groove. An elastic element 22 is sleeved on the surface of the inner rod. The elastic element 22 is a spring. The elastic force of the elastic element 22 causes the inner end of the rod 19 to abut against the outer circumference of the rotating sleeve 10.

[0033] Specifically, when the side frame 13 uses the ring edge 16 to limit the rotating sleeve 10, the fastening sleeve 20 is loosened. The elastic force of the elastic element 22 causes the side plate 21 to slide on the inner rod surface. At this time, the side plate 21 causes the insertion rod 19 to move inward inside the side frame 13. The elastic force of the elastic element 22 causes the inner side of the fastening sleeve 20 to always be in contact with the outer end of the side frame 13 until the inner end of the inwardly moved insertion rod 19 touches the outer circumference of the rotating sleeve 10. Both side frames 13 use the insertion rod 19 to limit the rotating sleeve 10.

[0034] In this embodiment, the elastic force of the elastic element 22 causes the inner end of the insertion rod 19 to abut against the outer circumference of the rotating sleeve 10. The insertion rod 19 restricts the rotating sleeve 10 from rotating arbitrarily outside the two clamping brackets 11, thus ensuring the stability of the square and round rod 8 in supporting the ceramic sleeve 4.

[0035] Working principle of this invention: Reference Figures 1 to 5As shown, loosening the threaded sleeve 15 causes the weight of the side frame 13 to move the vertical rod 14 downwards inside the slide groove, pushing the side frame 13 outwards. The outward movement of the side frame 13 causes the vertical rod 14 to move outwards inside the slide groove. The outward-moving side frame 13 gradually moves away from the rotating sleeve 10. At this point, the side frame 13 can no longer use the ring edge 16 to restrict the rotating sleeve 10. The square-round rod 8 then causes the rotating sleeve 10 to move downwards outside the two clamping frames 11 until the inner top surface of the inner ring groove 12 hooks onto the outer side of the two clamping frames 11. Rotating the rotating sleeve 10 allows it to rotate outside the clamping frame 11 using the inner ring groove 12 until the groove opening 111 aligns with the clamping frame 11, making it easy to remove the rotating sleeve 10 from the outer side of the two clamping frames 11.

[0036] The appropriate rotating sleeve 10 is fitted onto the outside of the two clamping brackets 11 using the slot 111. The threaded sleeve 15 is pulled, and the threaded sleeve 15 moves the side bracket 13 upward using the vertical rod 14 until the top surface of the side bracket 13 is in contact with the bottom surface of the ring edge 16. The pressure plate 17 is pulled upward, and the pressure plate 17 moves upward on the surface of the vertical rod 14. At this time, the locking teeth 171 at the bottom of the pressure plate 17 moves away from the rack 902, pushing the side bracket 13 inward. The side bracket 13 moves the vertical rod 14 inward inside the slide groove until the inner end face of the side bracket 13 is in contact with the outer circumference of the rotating sleeve 10. The tension applied to the threaded sleeve 15 is released, and the side bracket 13 moves the threaded sleeve 15 and the pressure plate 17 downward using the vertical rod 14. The bottom surface of the pressure plate 17 is in contact with the top surface of the inner strip at the top. At this time, the bottom surface of the pressure plate 17 is fastened to the top of the rack 902 using the locking teeth 171.

[0037] Rotating the screw sleeve 15 causes the vertical rod 14 to move upward inside the slide groove. The side frame 13 at the bottom of the vertical rod 14 uses the ring edge 16 to limit the rotating sleeve 10. The square rod 8 uses the ring edge 16 of the rotating sleeve 10 to limit the pressure plate 17 at the top of the vertical rod 14, preventing the outer frame 18 from sliding arbitrarily on the surface of the positioning plate 9.

[0038] Multiple ceramic sleeves 4 are arranged in a series of corresponding ends. Since the rotating sleeve 10 uses the inner ring groove 12 to limit the clamping frame 11, the rotating sleeve 10 uses two side frames 13 to move the square and round rod 8 upward until the top of the square and round rod 8 touches the bottom surface of the ceramic sleeve 4, thus completing the limitation of multiple ceramic sleeves 4.

[0039] When the side frame 13 uses the ring edge 16 to limit the rotating sleeve 10, the fastening sleeve 20 is loosened. The elastic force of the elastic element 22 causes the side plate 21 to slide on the inner rod surface. At this time, the side plate 21 causes the insertion rod 19 to move inward inside the side frame 13. The elastic force of the elastic element 22 causes the inner side of the fastening sleeve 20 to always be in contact with the outer end of the side frame 13 until the inner end of the inwardly moved insertion rod 19 touches the outer circumference of the rotating sleeve 10. Both side frames 13 use the insertion rod 19 to limit the rotating sleeve 10.

[0040] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A liquid-filled insulating porcelain bushing terminal for cross-linked polyethylene insulated power cables, characterized in that: It includes a wire clamp (1), a flange (2), a stress cone (3), a porcelain bushing (4), and an insulator (5). The wire clamp (1) is installed on the top of the stress cone (3), the flange (2) is installed on the base plate (6) with multiple screws, and the bottom surface of the base plate (6) is connected to the mounting plate (7) with multiple insulators (5). The flange (2) is provided with a support assembly for supporting the ceramic sleeve (4), the support assembly comprising: A square rod (8) passes through the flange (2) and the base plate (6) to support the bottom of the porcelain sleeve (4); The positioning plate (9) is installed on the bottom surface of the base plate (6) using the support rod 901, and the square and round rod (8) passes through the center of the positioning plate (9); The rotating sleeve (10) is spirally sleeved on the surface of the square and round rod (8) and is used to drive the square and round rod (8) to move up and down; The edge bracket (11) is fixed to the bottom surface of the positioning plate (9), and the rotating sleeve (10) is rotated and sleeved on the outside of the edge bracket (11).

2. The liquid-filled insulating porcelain bushing terminal for cross-linked polyethylene insulated power cables according to claim 1, characterized in that: The rotating sleeve (10) has an inner ring groove (12) inside, and the rotating sleeve (10) rotates on the outside of the clamping frame (11) using the inner ring groove (12).

3. The liquid-filled insulating porcelain bushing terminal for cross-linked polyethylene insulated power cables according to claim 2, characterized in that: The positioning plate (9) uses an extraction component to move the rotating sleeve (10) up and down. The extraction component includes: a side frame (13), a vertical rod (14), and a screw sleeve (15). The rotating sleeve (10) is provided with side frames (13) on both sides, and the outer circumference of the rotating sleeve (10) is provided with a ring edge (16) corresponding to the side frame (13). The side frame (13) is located at the bottom of the ring edge (16). The top surface of the side frame (13) is penetrated by a vertical rod (14) through the positioning plate (9). The top of the vertical rod (14) is spirally sleeved with a screw sleeve (15).

4. The liquid-filled insulating porcelain bushing terminal for cross-linked polyethylene insulated power cables according to claim 3, characterized in that: The side frame (13) uses the ring edge (16) to limit the rotating sleeve (10), and the inner top surface of the inner ring groove (12) is hooked to the outside of the side frame (11).

5. The liquid-filled insulating porcelain bushing terminal for cross-linked polyethylene insulated power cables according to claim 4, characterized in that: The positioning plate (9) has a groove on its surface corresponding to the vertical rod (14). The vertical rod (14) passes vertically through the groove, and a pressure plate (17) is sleeved on the surface of the vertical rod (14). The pressure plate (17) is located at the bottom of the screw sleeve (15). The bottom surface of the pressure plate (17) is provided with a tooth (171), and the top surface of the positioning plate (9) is provided with a rack (902) corresponding to the tooth (171).

6. The liquid-filled insulating porcelain bushing terminal for cross-linked polyethylene insulated power cables according to claim 5, characterized in that: The positioning plate (9) has an outer frame (18) slidingly fitted on both sides. The outer frame (18) slides on the surface of the positioning plate (9) using two inner strips. The bottom surface of the pressure plate (17) abuts against the top surface of the inner strip.

7. The liquid-filled insulating porcelain bushing terminal for cross-linked polyethylene insulated power cables according to claim 6, characterized in that: A square rod (181) is fixed on the top surface of the inner side of the outer frame (18), and the bottom end of the square rod (181) is vertically inserted into the top of the vertical rod (14).

8. The liquid-filled insulating porcelain bushing terminal for cross-linked polyethylene insulated power cables according to claim 3, characterized in that: A rod (19) is horizontally inserted at the center of the side frame (13), and a fastening sleeve (20) is spirally sleeved on the outer end of the rod (19).

9. The liquid-filled insulating porcelain bushing terminal for cross-linked polyethylene insulated power cables according to claim 8, characterized in that: The insert (19) has side plates (21) on both sides. The side frame (13) has an inner groove corresponding to the side plate (21). An inner rod is provided inside the inner groove. An elastic element (22) is sleeved on the surface of the inner rod. The elastic force of the elastic element (22) causes the inner end of the insert (19) to abut against the outer circumference of the rotating sleeve (10).

10. The liquid-filled insulating porcelain bushing terminal for cross-linked polyethylene insulated power cables according to claim 9, characterized in that: The inner side of the fastening sleeve (20) is in close contact with the outer side of the side frame (13).

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