Copper bar terminal portion insulator cover mold and method of using same

Abstract

A mold for an insulating cover at a copper busbar joint includes a horizontal base plate made of metal. Long wooden strips are fixed to the upper and lower parts of the base plate, clamping it between them. The horizontal width of the base plate is greater than the horizontal width of the wooden strips. One edge of the base plate protrudes from the wooden strips, forming a raised edge. Multiple grooves are formed on the surface of each wooden strip, with a raised portion between each pair of adjacent grooves. The raised edge of the base plate also has multiple notches. An outer sleeve is hinged to the raised edge of the base plate. The outer sleeve has a U-shaped cross-section and a cavity to accommodate the entire raised edge. This invention also provides a method for using the mold for the insulating cover at a copper busbar joint. The insulating cover produced by this invention maintains parallel, flat, and fitted upper and lower overlapping edges.

Description

Technical Field

[0001] This invention belongs to the field of electrical system equipment manufacturing technology, and in particular relates to a mold for an insulating cover for the copper busbar joint of a high- and low-voltage switchgear and its usage method. Background Technology

[0002] Because high and low voltage switchgear (such as distribution cabinets) is small in size and has short creepage distances between electrical components, all exposed copper busbars and live parts of components inside the cabinet must be insulated. For straight sections of copper busbars, insulation can be easily achieved by simply fitting heat shrink tubing directly onto the busbar surface. However, at copper busbar joints (including connections between adjacent busbar sections or bends, and connections between busbar sections and other components), it is impossible to directly use heat shrink tubing for insulation. This is because at copper busbar joints, multiple bolts are typically used to tighten the connected components. The nuts of these bolts protrude from one side of the busbar, while the bolt ends and nuts protrude from the other side. Therefore, this area has a complex shape, making it difficult to directly use heat shrink tubing for a tight cover. For this purpose, an insulating cover with a central raised portion (the raised portion covers the bolt nuts) is needed. Producing such an insulating cover with a raised portion requires the use of an insulating cover mold.

[0003] To this end, Chinese utility model patent CN206542070 U discloses an insulating cover mold, which includes a horizontal base plate 1 and a bent plate 5 made of metal material. After welding, the horizontal base plate 1 and the bent plate 5 form a roughly convex three-dimensional shape, i.e., a thicker central portion and relatively thinner side portions. Furthermore, the horizontal base plate 1 also needs to protrude laterally relative to the bent plate to form a convex edge, such as... Figure 1 As shown in segment AB.

[0004] Each use of the aforementioned insulating cover mold can produce one insulating cover. The usage steps are as follows: 1. Cut the heat shrink tubing into segments along its length (first cut), each segment being slightly longer than the designed length of the insulating cover mold; 2. Place the heat shrink tubing onto the insulating cover mold, put it into a heating box, and after the heat shrink tubing is heated, it shrinks and forms the insulating cover blank 8. The insulating cover blank has two overlapping edges (such as upper and lower edges). Figure 2 (Central overlap edge CD and overlap edge CE), the insulating cover blank is placed along the intersection line of the upper and lower overlap edges (i.e., from...) Figure 2Cut at point C) and remove the insulating cover blank 8 from the insulating cover mold; 3. Trim the front and rear edges of the insulating cover blank neatly (the reason for the second trimming is that the thermal shrinkage of the insulating cover blank is irregular, and the longitudinal edges of its two ends lack restraint, so the longitudinal shrinkage of the insulating cover blank 8 is even more irregular, and the longitudinal edges of its two ends will also shrink very irregularly, such as Figure 3 As shown by the GH and JK lines, it needs to be re-cut, and the cut shape is as follows. Figure 4 As shown; 4. Take the insulating cover blank 8 to the drilling machine and drill small holes on the overlapping edge 81 to obtain the finished insulating cover. The finished insulating cover 8 has a raised part 82 in the center, as shown. Figure 4 , Figure 5 As shown.

[0005] When using the aforementioned finished insulating cover, it is fitted onto the copper busbar connector. The raised portion in the center of the insulating cover blank is fitted over the protruding part of the bolt or nut that protrudes from the copper busbar body. Then, the upper and lower overlapping edges are secured with cable ties through the small holes. The reason for the need for upper and lower overlapping edges in the above process is that the insulating cover blank shrinks during the heating process. Without cutting, it cannot be removed from the mold or fitted onto the copper busbar connector. Therefore, the insulating cover blank needs to be cut longitudinally to remove it from the mold. After the insulating cover is fitted onto the copper busbar connector, the upper and lower overlapping edges need to be tied together to prevent the insulating cover from falling off the copper busbar connector. Because the insulating cover needs to have upper and lower overlapping edges, the insulating cover mold needs to have corresponding raised edges.

[0006] The above-mentioned insulating cover mold and its usage method have the following shortcomings: 1. After heat shrink molding, the upper and lower overlapping edges will warp in the cross section perpendicular to the longitudinal direction. As a result, after the insulating cover is placed outside the busbar copper bus and the upper and lower overlapping edges are tightened, the upper and lower overlapping edges are not close enough, which is not conducive to enhancing the insulation effect of preventing creepage gaps and also affects the appearance. 2. Each finished insulating cover needs to be cut twice perpendicular to the longitudinal direction, which wastes materials and increases the number of processes. 3. The insulating cover blank needs to be transferred to a drilling machine to drill holes in the overlapping edges. 4. Since the heat shrink tubing will stick to the metal surface after being heated, it is difficult to separate the insulating cover blank from the insulating cover mold. Summary of the Invention

[0007] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a mold for insulating cover at the connection of copper busbar. The insulating cover produced by this invention still maintains parallel, flat and fit between the upper and lower overlapping edges, and the production process saves steps and avoids material waste.

[0008] The objective can be achieved as follows: A mold for an insulating cover at a copper busbar joint, comprising a horizontal base plate made of metal material, characterized in that the longitudinal length of the horizontal base plate is greater than four times the longitudinal length of each insulating cover, and long strips of wood are fixedly provided above and below the horizontal base plate, with the length of the wood strips being longitudinal; the upper and lower wood strips are symmetrical in shape and clamp the horizontal base plate between them; the transverse width of the horizontal base plate is greater than the transverse width of the wood strips, and one side of the horizontal edge of the horizontal base plate protrudes relative to the upper and lower wood strips to form a convex edge;

[0009] Multiple grooves are formed on the surface of each wooden strip, with each groove extending perpendicular to the longitudinal direction. The longitudinal distance between any two adjacent grooves is equal to the longitudinal length of the insulating cover. A raised portion of the wooden strip is formed between any two adjacent grooves, and each wooden strip has four or more raised portions.

[0010] The convex edge of the horizontal baseboard also forms multiple notches, and the longitudinal position of each notch corresponds one-to-one with the longitudinal position of the concave seam on the surface of the wood strip.

[0011] The convex edge of the horizontal base plate is also hinged to an outer sleeve. The hinge axis between the convex edge and the outer sleeve is located at the longitudinal end of the convex edge. The transverse cross section of the outer sleeve is U-shaped, and the outer sleeve forms a cavity to accommodate the entire convex edge. Multiple convex edge cutouts are opened on the convex edge, and the outer sleeve also has multiple corresponding cutouts. When the convex edge is fully embedded in the cavity of the outer sleeve, the convex edge cutouts are aligned with the corresponding cutouts of the outer sleeve.

[0012] The term "one side" in the horizontal direction refers to either the left or the right side.

[0013] A method for using a mold for producing insulating covers at copper busbar joints, employing the aforementioned mold for producing insulating covers at busbar copper busbar joints, comprises the following steps:

[0014] Rotate the outer sleeve around its hinge axis away from the convex edge of the horizontal base plate, so that the rotating end of the outer sleeve is away from the convex edge of the horizontal base plate; then, put the heat shrink tubing over the horizontal base plate and the two wooden strips, with the outer sleeve outside the heat shrink tubing.

[0015] Rotate the outer sleeve around its hinge axis toward the heat shrink tubing so that the protruding edge of the horizontal base plate is fully embedded in the groove of the outer sleeve, and the heat shrink tubing part around the protruding edge of the horizontal base plate is also pressed into the groove of the outer sleeve.

[0016] The insulating cover mold, along with the heat shrink tubing, is sent into the heating box. The heat shrink tubing shrinks under heat to obtain the insulating cover blank. The part of the insulating cover blank that wraps around the convex edge is called the overlapping edge.

[0017] Remove the insulating cover mold along with the insulating cover blank from the heating box. Before the insulating cover blank has completely cooled down, use a round metal rod with a cone tip to pierce the convex edge cutout hole and the corresponding outer sleeve cutout hole. While it is still hot, drill small holes on the upper and lower overlapping edges of the insulating cover blank.

[0018] The outer sleeve rotates about its hinge axis away from the convex edge of the horizontal base plate, so that the rotating end of the outer sleeve moves away from the convex edge of the horizontal base plate, and the outer sleeve detaches from the insulating cover blank.

[0019] By using a cutter to cut into the notches on the convex edges and the recesses on the surface of the wooden strips, the insulating cover blank is divided longitudinally into multiple units (the insulating cover blank between each two recesses forms a unit).

[0020] Use a cutter to cut the intersection of the upper and lower overlapping edges of each unit of the insulating cover blank to obtain the finished insulating cover. Remove the finished insulating cover from the insulating cover mold.

[0021] The present invention has the following advantages and effects:

[0022] During the heat shrinking process, the heat shrink tubing corresponding to the upper and lower overlapping edges is clamped by the outer sleeve and the convex edge, preventing warping. After heat shrinking, the overlapping edges and the corner of the heat shrink tubing are square, and the upper and lower overlapping edges remain parallel, flat, and close together. Therefore, after the insulation cover is put on the busbar copper bus node, the upper and lower overlapping edges remain close together, maintaining a good seal and avoiding creepage gaps. Moreover, the appearance is square and neat.

[0023] In each production process, apart from the finished insulation cover units at both ends, the remaining finished insulation cover units only need to be cut once perpendicular to the longitudinal direction, which saves both processes and materials.

[0024] The outer sleeve and the raised edge serve as both forming molds for the two overlapping edges and fixing molds for drilling holes in the two overlapping edges. That is, during drilling, the upper and lower overlapping edges are clamped and tensioned by the outer sleeve and the raised edge. When the overlapping edges are both tensioned and at a relatively high temperature (both are indispensable), a round metal rod with a conical tip can be used directly for drilling without the need to use a special drilling machine, making the drilling process convenient. Moreover, since the upper and lower overlapping edges are in a parallel and nearly flush state during drilling, it ensures that the holes drilled from the upper and lower overlapping edges are aligned with each other.

[0025] The insulating cover has most of its surface in contact with the wooden strips, and the wooden strips will not stick to the plastic insulating sleeve, so demolding is easy after heat shrinkage. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the production process of a traditional insulating cover mold.

[0027] Figure 2 This is a schematic diagram of the structure of an insulating cover produced by traditional insulating cover mold production.

[0028] Figure 3 This is a top view diagram of the irregular shrinkage at both ends of the insulating cover blank produced by traditional insulating cover mold production.

[0029] Figure 4 yes Figure 3 The diagram shows a top view of the insulating cover blank after both ends have been cut off.

[0030] Figure 5 yes Figure 4 The diagram shows a three-dimensional structure of the insulating cover blank.

[0031] Figure 6 This is a top view structural diagram of the insulating cover mold of the first specific embodiment of the present invention.

[0032] Figure 7 yes Figure 6 A schematic diagram showing the changes in the state of the inner and outer components after they are rotated about their hinge axis away from the convex edge of the horizontal base plate.

[0033] Figure 8 yes Figure 6 A side view of the structure shown.

[0034] Figure 9 Figure 8 Schematic diagram of the cross-sectional structure of WW.

[0035] Figure 10 yes Figure 7 The diagram shows a three-dimensional structure of the insulating cover mold.

[0036] Figure 11 yes Figure 10 An exploded view of the intermediate horizontal baseboard and the two wooden strips above and below.

[0037] Figure 12 This is a schematic diagram of the intermediate process of step (1) in the second specific embodiment of the present invention.

[0038] Figure 13 This is a schematic diagram showing the state after step (1) of the second specific embodiment of the present invention is completed.

[0039] Figure 14 yes Figure 13 A cross-sectional view of the state shown.

[0040] Figure 15 This is a schematic diagram of the state after step (2) of the second specific embodiment is completed.

[0041] Figure 16This is a schematic diagram of the state after step (3) of the second specific embodiment is completed.

[0042] Figure 17 This is a schematic diagram of the state after step (4) of the second specific embodiment is completed.

[0043] Figure 18 This is a schematic diagram of the finished insulating cover obtained from step (7) of the second specific embodiment. Detailed Implementation Example 1

[0044] Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 The mold shown is for producing an insulating cover for the copper busbar node of a distribution cabinet, comprising a horizontal base plate 1 made of metal material, the longitudinal length of which is ( Figure 8 The length of the UV shield is greater than four times the longitudinal length of each insulating cover. Long wooden strips 2 are fixed to the top and bottom of the horizontal base plate 1, with the length of the strips 2 being longitudinal. The upper and lower wooden strips 2 are symmetrical in shape and are locked together using bolts 7 and nuts to clamp the horizontal base plate in the middle (the horizontal base plate 1 has mounting holes 13 for the bolts 7 to pass through, and the upper and lower wooden strips 2 each have mounting holes 23 for the bolts 7 to pass through; the bolt heads and nuts of the bolts 7 are recessed into the mounting holes 23 of the wooden strips 2). The transverse width of the horizontal base plate 1 is greater than the transverse width of the wooden strips (e.g., ...). Figure 9 The right edge of the horizontal baseboard 1 protrudes relative to the upper and lower wooden strips 2, forming a raised edge 11; multiple grooves 20 are also formed on the surface of each wooden strip 2, with the extension direction of each groove 20 perpendicular to the longitudinal direction, and the longitudinal distance between each two adjacent grooves 20 (equivalent to the width of QP). Figure 6 The length a) is equal to the longitudinal length of the insulating cover; the wooden strip 2 has a raised part 21 between each two adjacent grooves 20, and there are four raised parts 21 on each wooden strip 2; the convex edge 11 of the horizontal base plate also has multiple notches 12, and the longitudinal position of each notch 12 corresponds one-to-one with the longitudinal position of the grooves 20 on the surface of the wooden strip.

[0045] Figure 7 , Figure 9 , Figure 11 As shown, the convex edge 11 of the horizontal base plate is also hinged to an outer sleeve 3. The hinge axis 4 of the convex edge 11 and the outer sleeve 3 is located at the longitudinal end of the convex edge 11. The transverse cross-section of the outer sleeve 3 is U-shaped, and the outer sleeve 3 forms a cavity 30 to accommodate the entire convex edge, as shown. Figure 9As shown, multiple convex edge hollow holes 10 are provided on the convex edge 11, and multiple outer sleeve hollow holes 31 are also provided on the outer sleeve 3. When the convex edge 11 is fully embedded in the groove 30 of the outer sleeve, the convex edge hollow holes 10 are aligned with the corresponding outer sleeve hollow holes 31.

[0046] Example 2

[0047] A method for using a mold for insulating covers at copper busbar joints, employing the mold described in Embodiment 1 for producing insulating covers at copper busbar joints in distribution cabinets, comprises the following steps:

[0048] (1) Rotate the outer sleeve 3 about its hinge axis 4 in a direction away from the convex edge 11 of the horizontal base plate, so that the rotating end of the outer sleeve 3 is away from the convex edge 11 of the horizontal base plate, such as... Figure 12 As shown; next, the heat shrink tubing 6 is fitted over the horizontal baseboard 1 and the two wooden strips 2, while the outer sleeve 3 is positioned outside the heat shrink tubing 6, as shown. Figure 13 , Figure 14 As shown;

[0049] (2) Rotate the outer sleeve 3 around its hinge axis 4 toward the heat shrink tubing 6, so that the protruding edge 11 of the horizontal base plate is fully embedded in the groove 30 of the outer sleeve, and the heat shrink tubing 6 portion around the protruding edge 11 of the horizontal base plate is also pressed into the groove 30 of the outer sleeve, such as... Figure 15 As shown;

[0050] (3) The insulating cover mold (including the horizontal base plate 1, the upper and lower wooden strips 2, and the outer sleeve 3) together with the heat shrink tubing 6 is sent into the heating box. The heat shrink tubing 6 shrinks under heat to obtain the insulating cover blank 8. The part of the insulating cover blank that wraps around the convex edge is called the overlapping edge 81, such as Figure 16 As shown;

[0051] (4) Remove the insulating cover mold along with the insulating cover blank 8 from the heating box. Before the insulating cover blank 8 has completely cooled, use a round metal rod with a conical tip to pierce the convex edge cutout hole 10 and the corresponding outer sleeve cutout hole 31. While it is still hot, drill small holes 80 on the upper and lower overlapping edges 81 of the insulating cover blank 8. Figure 17 As shown;

[0052] (5) The outer sleeve 3 rotates around its hinge axis 4 in a direction away from the convex edge 11 of the horizontal base plate, so that the rotating end of the outer sleeve 3 moves away from the convex edge 11 of the horizontal base plate, and the outer sleeve 3 is separated from the insulating cover blank 8.

[0053] (6) Using a cutter, cut into the notch 12 on the convex edge and the recess 20 on the surface of the wooden strip to longitudinally divide the insulating cover blank 8 into four insulating cover blank units (each insulating cover blank segment between two recesses 20 forms an insulating cover blank unit), the longitudinal length of each insulating cover blank unit is equivalent to Figure 6The length of 'a' in the middle;

[0054] (7) Using a cutting tool, cut the intersection line of the upper and lower overlapping edges 81 of each insulating cover blank 8 to form a slit 810, thus obtaining the finished insulating cover 8, such as Figure 18 As shown, the finished insulating cover is removed from the insulating cover mold.

[0055] In the first embodiment described above, the number of raised sections on each wooden strip can be changed to six, eight, or ten, etc.; correspondingly, the grooves 20 on the surface of each wooden strip 2 can be changed to seven, nine, or eleven, etc., and the notches 12 on the raised edge 11 of the horizontal base plate can be changed to seven, nine, or eleven, etc.; correspondingly, in the second embodiment, the insulating cover blank 8 is divided longitudinally into six insulating cover blank units, eight insulating cover blank units, or ten insulating cover blank units, etc.

Claims

1. A copper bar joint portion insulation cover mold comprising a horizontal base plate made of a metal material, characterized by, The longitudinal length of the horizontal base plate is more than four times the longitudinal length of each insulating cover. Long strips of wood are fixed at the top and bottom of the horizontal base plate, with the length of the strips being longitudinal. The upper and lower strips are symmetrical in shape and clamp the horizontal base plate together. The transverse width of the horizontal base plate is greater than the transverse width of the strips. The edge of one side of the horizontal base plate protrudes relative to the upper and lower strips to form a convex edge. Multiple grooves are formed on the surface of each wooden strip, with each groove extending perpendicular to the longitudinal direction. The longitudinal distance between any two adjacent grooves is equal to the longitudinal length of the insulating cover. A raised portion of the wooden strip is formed between any two adjacent grooves, and each wooden strip has four or more raised portions. The convex edge of the horizontal baseboard also forms multiple notches, and the longitudinal position of each notch corresponds one-to-one with the longitudinal position of the concave seam on the surface of the wood strip. The convex edge of the horizontal base plate is also hinged to an outer sleeve. The hinge axis between the convex edge and the outer sleeve is located at the longitudinal end of the convex edge. The transverse cross section of the outer sleeve is U-shaped, and the outer sleeve forms a cavity to accommodate the entire convex edge. Multiple convex edge hollow holes are opened on the convex edge, and the outer sleeve also has multiple corresponding outer sleeve hollow holes. When the convex edge is completely embedded in the cavity of the outer sleeve, the convex edge hollow holes are aligned with the corresponding hollow holes of the outer sleeve.

2. A method of using the insulating cover mold for the copper busbar joint as described in claim 1, comprising the following steps: Open the outer sleeve relative to the convex edge of the horizontal baseboard, so that the rotating end of the outer sleeve is away from the convex edge of the horizontal baseboard; then, put the heat shrink tubing over the horizontal baseboard and the two wooden strips above and below, with the outer sleeve outside the heat shrink tubing. Rotate the outer sleeve around its hinge axis toward the heat shrink tubing so that the convex edge of the horizontal base plate is fully embedded in the groove of the outer sleeve, and the heat shrink tubing part around the convex edge of the horizontal base plate is also pressed into the groove of the outer sleeve. The insulating cover mold, along with the heat shrink tubing, is sent into the heating box. The heat shrink tubing shrinks under heat, resulting in the insulating cover blank. Remove the insulating cover mold along with the insulating cover blank from the heating box. Before the insulating cover blank has completely cooled down, use a round metal rod with a cone tip to pierce the hollow hole on the convex edge and the corresponding hollow hole on the outer sleeve. While it is still hot, drill small holes on the upper and lower overlapping edges of the insulating cover blank. Rotate the outer sleeve around its hinge axis away from the convex edge of the horizontal base plate, so that the rotating end of the outer sleeve is away from the convex edge of the horizontal base plate, and the outer sleeve is separated from the insulating cover blank. By using a cutter to cut into the notches on the convex edges and the recesses on the surface of the wooden strips, the insulating cover blank is longitudinally divided into multiple units; Use a cutter to cut the intersection of the upper and lower overlapping edges of each unit of the insulating cover blank to obtain the finished insulating cover. Remove the finished insulating cover from the insulating cover mold.

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