A plug-in busbar

Abstract

The application belongs to the technical field of plug-in busbars, and particularly relates to a plug-in busbar. The plug-in busbar in the prior art needs to be screwed with various fastening bolts when external wires are connected, which is troublesome and laborious, and the external wires are prone to being pulled to cause poor contact. The following scheme is proposed, which comprises a busbar core plate sleeved with an insulating outer layer, the wiring ends of the busbar core plate are exposed, and the wiring ends of the busbar core plate are arranged in a stepped manner. The wiring ends of the busbar core plate are arranged in a zigzag shape, a transition inclined surface is arranged between the zigzag-shaped bent head and the busbar core plate, and a U-shaped notch for wiring is formed in the end of the zigzag-shaped bent head. After the external wires are connected, if the external wires are accidentally pulled, the C-shaped clamping groove in the hinged gate lever is a bent structure, which can offset most of the pulling force, so that the bare wire part of the compressed part in the strip-shaped perforation is little affected, and the plug-in busbar has good anti-pulling or anti-vibration falling-off effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plug-in busbar, in particular to a plug-in busbar. BACKGROUND

[0002] The plug-in busbar is a kind of closed metal device composed of copper and aluminum busbar columns, which is used to distribute large power to each element of the dispersion system. In the indoor low-voltage power transmission trunk line engineering project, it has been increasingly replaced by wire and cable. The joint device of the busbar trough product is provided with a plurality of insulating plates having through holes in the middle. The two sides of the insulating plate are respectively provided with a conductive sheet also having a through hole in the middle. The phase conductor row of each section of the busbar trough product is inserted and connected with the phase conductor row of the adjacent section of the busbar trough product through the insulating plate, and then fastened and connected through the joint bolt.

[0003] Through the search, in the actual operation, when the external wire is connected to the dense plug-in busbar, the bolt is usually used to fix the wire head with a metal gasket, or the tin soldering process is used to connect the external wire to the busbar. This wiring method not only causes the bolt to loosen and cause poor contact due to long-term low-frequency vibration, but also causes the wire end to be accidentally pulled, which causes the loosening of the wiring place, and it is not convenient to check and maintain the line. Therefore, we propose a new type of wiring mechanism for plug-in busbar that can prevent loosening of the wiring place due to vibration or accidental pulling. SUMMARY

[0004] In view of the technical problem that the plug-in busbar in the prior art needs to be screwed with various fastening bolts when the external wire is connected, which is troublesome and laborious, and is prone to poor contact due to pulling, the present application adopts the following technical scheme:

[0005] The utility model provides a kind of plug-in busbar, including the busbar core board with insulating outer layer, the terminal of the busbar core board is exposed in a section, the terminal of the busbar core board is arranged in ladder shape;And the terminal of busbar core board is set to be folded head, transition bevel is arranged between the folded head and busbar core board, and the end of folded head is opened U-shaped gap for wiring;Metallic card piece is slidably inserted in the U-shaped gap, and the bottom of metallic card piece is fixed with rubber pad;Vertical self-locking stud is reserved on the upper surface of the metallic card piece, and shoulder block is reserved on the top end of self-locking stud, the outer wall of shoulder block is rotatably connected with articulated gate lever, flat nut is screwed on the outer wall of self-locking stud, and flat nut is located between the upper surface of folded head and articulated gate lever;The circumferential outer wall of self-locking stud is opened with strip-shaped perforation penetrating through the self-locking stud;When wiring, the end of external connecting wire is inserted into strip-shaped perforation after peeling, and then flat nut is screwed to compress external connecting wire;The end of articulated gate lever close to transition bevel is reserved with anti-drop bent hook plate, and C-shaped clamping groove is opened in the middle of the lower surface of anti-drop bent hook plate;Resistive spring is fixed between the lower surface of the end of articulated gate lever away from C-shaped clamping groove and rubber pad;And cooperate the effect of the resistive spring of other end, when needing to detach external connecting wire or check its tightness, only need to press down the end of articulated gate lever close to resistive spring to lift the end of anti-drop bent hook plate, then loosen flat nut to pull out external connecting wire.

[0006] Further provided in that the upper surface of the articulated gate lever is opened with articulated hole in the middle, and the lower surface of the articulated gate lever is fixed with mutually symmetrical ear plates on both sides close to articulated hole, and the middle of two ear plates is respectively opened with horizontal shaft hole on a straight line, and the same articulated shaft is inserted between two shaft holes;The side of shoulder block is opened with shaft insertion hole, and articulated shaft is rotatably connected in shaft insertion hole, and the articulated gate lever is made of insulating material, so that electric shock caused by accidental touch of wiring position can be avoided after wiring.

[0007] Further provided in that the end of articulated gate lever away from C-shaped clamping groove is opened with screw hole in the middle of resistive spring, and resistive screw is screwed in screw hole;By setting resistive screw, the bottom end of resistive screw can be screwed to contact with the surface of rubber pad below after installation, so that external connecting wire clamped in C-shaped clamping groove can be tightly pressed.

[0008] Further provided in that the resistive screw is made of insulating material, and the thread of resistive screw is made into self-locking thread structure;The retreat-preventing effect and resistive effect of resistive screw can be improved.

[0009] Further, the bottom end of the metal clamping piece is fixed with an anti-disengagement plugboard, and the upper surface of the rubber pad is provided with a T-shaped slot matching the shape and size of the anti-disengagement plugboard; the top view of the metal clamping piece matches the shape of the U-shaped notch, and the top end of the metal clamping piece is lower than the plane of the upper surface of the folded head; after the metal clamping piece is inserted into the U-shaped notch, the metal clamping piece and the rubber pad will not rotate due to the rotation of the flat nut.

[0010] Further, the upper surface of the rubber pad is fixed with a spring fixing protrusion near one end of the abutting spring, the bottom end of the abutting spring is sleeved and fixed on the spring fixing protrusion, and the abutting spring is prevented from slipping off.

[0011] Further, the upper surface of the metal clamping piece is provided with a spring counterbore near the middle of one end of the abutting spring, a cylindrical jacking rod is slidably connected in the spring counterbore, a return spring is fixed at the bottom end of the cylindrical jacking rod, and an anti-skid groove is formed at the top end of the cylindrical jacking rod.

[0012] Further, a T-shaped guide metal sheet in a T-shaped structure is inserted into the strip-shaped perforation, the lower surface of one end of the T-shaped guide metal sheet is fixed with two vertical guide insertion rods, and the upper surface of the metal clamping piece is provided with guide holes matching the guide insertion rods on the front and rear sides of the spring counterbore; the T-shaped guide metal sheet is tightly attached to the lower surface of the flat nut.

[0013] Further, the top end of the cylindrical jacking rod pushes the T-shaped guide metal sheet upward to contact the lower surface of the flat nut when the external power cord is not inserted, and a poking block is reserved near the top end of the side of the cylindrical jacking rod away from the self-locking stud; when the external power cord is inserted, the poking block is first pressed downward to assist in pressing down the cylindrical jacking rod, facilitating the subsequent insertion.

[0014] Further, the top end of the cut shoulder protrusion is provided with a tensioning screw hole, a dust cover is sleeved on the top end outer wall of the hinged gate rod, a twist-preventing insertion block matching the hinge hole is reserved in the middle of the lower surface of the dust cover, a through hole is formed in the middle of the twist-preventing insertion block, a sink groove is formed at the top end of the dust cover located at the top end of the through hole, the through hole and the tensioning screw hole match in position and size, and an insulating nut is screwed in the tensioning screw hole; a vertical wire passing hole is reserved at one end of the dust cover near the C-shaped clamping groove.

[0015] The beneficial effects in the application are:

[0016] 1. The anti-disengagement bent hook plate with the C-shaped clamping groove can be used after the external power cord is connected, and if the external power cord is accidentally pulled, the C-shaped clamping groove in the hinged gate rod will offset most of the pulling force due to the bent structure, thus having little effect on the bare wire part of the compressed part in the strip-shaped perforation, and thus having good anti-disengagement effect in pulling or vibration.

[0017] 2、Through the setting of the cylindrical ejector pin and T-shaped guide metal sheet, the exposed section of the external connecting wire passing through the bar-shaped perforation can be tightly pressed between the anti-skid groove of the top end of the cylindrical ejector pin and the lower surface of the T-shaped guide metal sheet.

[0018] 3、Through the setting of the dust cover, the oil stain and dust prevention treatment can be carried out on the wiring part, the cleanliness of the wiring part is ensured, and the corrosion damage is reduced.

[0019] 4、Through the setting of the fold-shaped bent head with certain downward inclination, the rubber pad can be tightly clamped below the U-shaped gap during use, and the anti-disengagement effect is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is an overall structure schematic view of the plug-in busbar proposed in the application;

[0021] Figure 2 It is a front view of the plug-in busbar proposed in the application;

[0022] Figure 3 It is a three-dimensional structure schematic view of the plug-in busbar after removing the dust cover proposed in the application;

[0023] Figure 4 It is a front view of the plug-in busbar when wiring proposed in the application;

[0024] Figure 5 It is a bottom view of the dust cover in the plug-in busbar proposed in the application;

[0025] Figure 6 It is a three-dimensional structure schematic view of the wiring mechanism in the plug-in busbar proposed in the application;

[0026] Figure 7 It is an exploded view of the wiring mechanism in the plug-in busbar proposed in the application;

[0027] Figure 8 It is an assembly drawing of the metal clamping piece and the cylindrical ejector pin in the plug-in busbar proposed in the application.

[0028] In the figure: 1, insulating outer layer; 2, external wire; 3, insulating nut; 4, dust cover; 401, sink; 402, wire hole; 403, anti-twist plug; 5, female bus core plate; 501, U-shaped notch; 502, folded head; 503, transition slope; 6, rubber pad; 601, T-shaped slot; 602, spring fixing block; 7, pressing screw; 8, hinged gate lever; 801, hinge hole; 802, C-shaped clamping groove; 803, hinge shaft; 804, ear plate; 9, pressing spring; 10, cylindrical ejector rod; 11, metal clamping piece; 1101, anti-disengagement plugboard; 1102, self-locking stud; 1103, strip-shaped perforation; 1104, shoulder cutting block; 1105, tensioning screw hole; 1106, guide hole; 1107, spring counterbore; 12, flat nut; 13, T-shaped guide metal sheet; 14, guide plug; 15, return spring. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all.

[0030] In this embodiment, reference is made to Figures 1-8The utility model provides a kind of plug-in busbar, including the busbar core board 5 with the insulating outer layer 1, the terminal of busbar core board 5 is exposed a section, the terminal of busbar core board 5 is set into echelon, and the end of the last busbar core board 5 is not more than the end of the insulating outer layer 1 of the set terminal;And the terminal of busbar core board 5 is set into meander head 502, transition bevel 503 is arranged between meander head 502 and busbar core board 5, and the end of meander head 502 is opened U-shaped gap 501 for wiring;U-shaped gap 501 is clamped with wiring mechanism, and wiring mechanism includes the metal card 11 slidingly inserted in U-shaped gap 501, and the bottom of metal card 11 is fixed with rubber pad 6, and rubber pad 6 is located on the lower surface of meander head 502 and is tightly clamped between the upper surface of next busbar core board 5 and meander head 502;Vertical self-locking stud 1102 is reserved on the upper surface of metal card 11, and shoulder block 1104 is reserved on the top of self-locking stud 1102, hinged gate lever 8 is rotatably sleeved on the outer wall of shoulder block 1104, flat nut 12 is screwed on the outer wall of self-locking stud 1102, and flat nut 12 is located between the upper surface of meander head 502 and hinged gate lever 8;Self-locking stud 1102 is opened with the strip-shaped perforation 1103 that penetrates self-locking stud 1102 radially;When wiring, the end of external connecting wire 2 is inserted into strip-shaped perforation 1103 after peeling, and then flat nut 12 is screwed to compress external connecting wire 2;Anti-drop hook plate is reserved on the end of hinged gate lever 8 close to transition bevel 503, and C-shaped clamping groove 802 is opened in the middle of the lower surface of anti-drop hook plate;Resist spring 9 is fixed between the lower surface of the end of hinged gate lever 8 away from C-shaped clamping groove 802 and rubber pad 6;

[0031] Specifically, by setting the anti-drop hook plate with C-shaped clamping groove 802, after connecting external connecting wire 2, if external connecting wire 2 is accidentally pulled, C-shaped clamping groove 802 in hinged gate lever 8 is a bent structure, which can offset most of the pulling force, so the bare wire part of the compressed part in strip-shaped perforation 1103 is little affected, thus having good anti-drop effect of pulling or vibration, and cooperating with the effect of the other end resist spring 9, when it is necessary to detach external connecting wire 2 or check its tightness, only need to press the end of hinged gate lever 8 close to resist spring 9 to lift one end of anti-drop hook plate, then loosen flat nut 12 to pull out external connecting wire 2.

[0032] In the application, the upper surface of the articulated gate lever 8 is provided with an articulated hole 801 in the middle, and the lower surface of the articulated gate lever 8 is fixed with two symmetrical ear plates 804 near the two sides of the articulated hole 801, and the middle of the two ear plates 804 is respectively provided with a horizontal shaft hole on the same straight line, and the same articulated shaft 803 is inserted between the two shaft holes; the side of the cut shoulder protrusion 1104 is provided with a shaft insertion hole, and the articulated shaft 803 is rotatably connected in the shaft insertion hole, and the articulated gate lever 8 is made of insulating material, which can avoid the situation of electric shock caused by accidental contact with the wiring position after wiring.

[0033] Referring to Figure 6 , the end of the articulated gate lever 8 away from the C-shaped clamping groove 802 is provided with a threaded hole in the middle of the intermediate abutting spring 9, and the abutting screw 7 is screwed in the threaded hole; by arranging the abutting screw 7, the bottom end of the abutting screw 7 can be screwed to the surface of the rubber pad 6 below after installation, at this time the external power line 2 clamped in the C-shaped clamping groove 802 can be tightly pressed.

[0034] In the application, the abutting screw 7 is made of insulating material, and the thread of the abutting screw 7 is made into a self-locking thread structure; the anti-backout effect and the abutting effect of the abutting screw 7 can be improved.

[0035] Referring to Figure 1 and Figure 6 , the bottom end of the metal clamping piece 11 is fixed with a anti-dropping plug plate 1101, and the upper surface of the rubber pad 6 is provided with a T-shaped insertion slot 601 matching the outer dimensions of the anti-dropping plug plate 1101; the top view shape of the metal clamping piece 11 is matched with the shape of the U-shaped notch 501, and the top end of the metal clamping piece 11 is lower than the plane of the upper surface of the folded-up head 502; after the metal clamping piece 11 is slidably inserted into the U-shaped notch 501, the whole and the rubber pad 6 will not be rotated due to the rotation of the flat washer 12.

[0036] Referring to Figures 3-4 , Figure 7 , the upper surface of the rubber pad 6 is fixed with a spring fixing protrusion 602 near one end of the abutting spring 9, and the end of the folded-up head 502 away from the transition inclined surface 503 is inclined downward; the inserted rubber pad 6 can be tightly pressed below, and the spring fixing protrusion 602 can be fixed on the spring fixing protrusion 602, preventing the abutting spring 9 from slipping off.

[0037] Referring to Figure 8The upper surface of the metal clamping piece 11 is provided with a spring counterbore 1107 in the middle of the end close to the abutting spring 9, and a cylindrical jacking rod 10 is slidably connected in the spring counterbore 1107, and the bottom end of the cylindrical jacking rod 10 is fixed with a return spring 15, and the top end of the cylindrical jacking rod 10 is provided with an anti-skid groove; through the setting of the cylindrical jacking rod 10, the exposed section of the external connecting wire 2 passing through the strip-shaped through hole 1103 is tightly abutted against the top end of the cylindrical jacking rod 10 and the lower surface of the flat nut 12.

[0038] With reference to Figure 4 , Figures 7-8 The strip-shaped through hole 1103 is also inserted with a T-shaped guide metal sheet 13 of a T-shaped structure as a whole, and the lower surface of the end of the T-shaped guide metal sheet 13 close to the cylindrical jacking rod 10 is fixed with two vertical guide insertion rods 14, and the upper surface of the metal clamping piece 11 is provided with guide holes 1106 adapted to the guide insertion rods 14 on the front and rear sides close to the spring counterbore 1107; the T-shaped guide metal sheet 13 is tightly abutted against the lower surface of the flat nut 12; through the setting of the T-shaped guide metal sheet 13, the end of the external connecting wire 2 can be prevented from being squeezed and displaced from the anti-skid groove when the flat nut 12 is spin-welded.

[0039] With reference to Figure 8 When the cylindrical jacking rod 10 is not inserted with the external connecting wire 2, the top end of the cylindrical jacking rod 10 squeezes and pushes the T-shaped guide metal sheet 13 upward to be in contact with the lower surface of the flat nut 12, and the side of the cylindrical jacking rod 10 away from the self-locking stud 1102 is reserved with a jacking block close to the top end; when the external connecting wire 2 is inserted, the jacking block is first pressed downward to assist in pressing down the cylindrical jacking rod 10, which is convenient for later insertion.

[0040] With reference to Figures 3-4 , Figures 6-8 The top end of the shoulder cutting protrusion 1104 is provided with a tensioning screw hole 1105, the top end outer wall of the hinged gate rod 8 is sleeved with a dust cover 4, the lower surface of the dust cover 4 is reserved with a twist-preventing insertion block 403 adapted to the hinged hole 801 in the middle, the twist-preventing insertion block 403 is provided with a through hole in the middle, the top end of the dust cover 4 is provided with a sink groove 401 at the top end of the through hole, the position and size of the through hole and the tensioning screw hole 1105 are adapted, and the tensioning screw hole 1105 is screwed with an insulating nut 3; the top end of the dust cover 4 is reserved with a vertical wire passing hole 402 close to the end of the C-shaped clamping groove 802; when the external connecting wire 2 is installed, the end of the external connecting wire 2 with the skin peeled off is first passed through the top end of the wire passing hole 402, and then other position installation is performed through the C-shaped clamping groove 802, the wire connection part can be treated with oil stain and dust prevention, the cleanliness of the wire connection part is ensured, and corrosion damage is reduced.

[0041] In use, first, the end of the outer connecting wire 2 stripped of the skin is passed through the top end of the wire hole 402, then the hinged gate lever 8 is pressed close to one end of the abutting spring 9, at this time, one end of the anti-off curved hook plate is lifted, then the exposed end of the outer connecting wire 2 bent into an L-shaped whole is passed from below the C-shaped clamping groove 802, then inserted into the strip-shaped perforation 1103 from the lower surface of the T-shaped guiding metal sheet 13, at the same time, the push block is buckled downward from the other end to assist in pressing down the cylindrical top rod 10, and continues to be inserted until the end of the outer connecting wire 2 is inserted into the top end of the anti-off groove and the lower surface of the T-shaped guiding metal sheet 13; then the flat nut 12 is screwed in the reverse direction, and the inserted outer connecting wire 2 is pressed tightly; finally, the pressed hinged gate lever 8 is released, and the abutting screw 7 is screwed in for abutting; finally, the dust cover 4 is fixed in the tensioning screw hole 1105 by the insulating nut 3.

[0042] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A plug-in busbar comprising a busbar core (5) which is sheathed with an insulating outer layer (1), the terminal ends of the busbar core (5) each being exposed over a section, characterized in that The terminal of the busbar core plate (5) is arranged in a stepped shape; the terminal of the busbar core plate (5) is arranged in a folded head (502), a transition slope (503) is arranged between the folded head (502) and the busbar core plate (5), and a U-shaped notch (501) for wiring is formed at the end of the folded head (502); a metal clamping piece (11) is slidably inserted into the U-shaped notch (501), and a rubber pad (6) is fixed to the bottom of the metal clamping piece (11); a vertical self-locking stud (1102) is reserved on the upper surface of the metal clamping piece (11), a shoulder cutting protrusion (1104) is reserved at the top end of the self-locking stud (1102), a hinged gate lever (8) is rotatably sleeved on the outer wall of the shoulder cutting protrusion (1104), a flat nut (12) is screwed on the outer wall of the self-locking stud (1102), and the flat nut (12) is located between the upper surface of the folded head (502) and the hinged gate lever (8); a strip-shaped hole (1103) is formed in the circumferential outer wall of the self-locking stud (1102), and the strip-shaped hole (1103) penetrates through the self-locking stud (1102); during wiring, the end of the external power line (2) is inserted into the strip-shaped hole (1103) after being stripped, and the flat nut (12) is then screwed to compress the external power line (2); a anti-dropping hook plate is reserved at one end of the hinged gate lever (8) close to the transition slope (503), and a C-shaped clamping groove (802) is formed in the middle of the lower surface of the anti-dropping hook plate; a resisting spring (9) is fixed between the lower surface of the hinged gate lever (8) away from the C-shaped clamping groove (802) and the rubber pad (6).

2. The plug-in busbar according to claim 1, characterized in that A hinge hole (801) is formed in the middle of the upper surface of the hinged gate lever (8), and two ear plates (804) that are symmetrical to each other are fixed on the lower surface of the hinged gate lever (8) on both sides close to the hinge hole (801), and a horizontal shaft hole that is on a straight line is formed in the middle of each of the two ear plates (804), and a same hinge shaft (803) is inserted between the two shaft holes; an shaft insertion hole is formed in the side of the shoulder cutting protrusion (1104), and the hinge shaft (803) is rotatably connected in the shaft insertion hole; the hinged gate lever (8) is made of insulating material.

3. The plug-in busbar according to claim 1, characterized in that A screw hole is formed in the middle of one end of the hinged gate lever (8) away from the C-shaped clamping groove (802), and a resisting screw rod (7) is screwed in the screw hole.

4. The plug-in power bus of claim 3, wherein, The resisting screw rod (7) is made of insulating material, and the thread of the resisting screw rod (7) is made in a self-locking thread structure.

5. The plug-in patch panel of claim 1, wherein, A anti-dropping insertion plate (1101) is fixed to the bottom end of the metal clamping piece (11), and a T-shaped insertion slot (601) with the same size as the anti-dropping insertion plate (1101) is formed in the upper surface of the rubber pad (6); the top view shape of the metal clamping piece (11) is matched with the shape of the U-shaped notch (501), and the top end of the metal clamping piece (11) is lower than the plane of the upper surface of the folded head (502).

6. The plug-in patch panel of claim 1, wherein, A spring fixing protrusion (602) is fixed to one end of the upper surface of the rubber pad (6) close to the resisting spring (9), and the end of the folded head (502) away from the transition slope (503) is inclined downward.

7. The plug-in patch panel of claim 1, wherein, The upper surface of the metal clamping piece (11) is provided with a spring counterbore (1107) in the middle of one end close to the abutting spring (9), and a cylindrical jacking rod (10) is slidably connected in the spring counterbore (1107), and the bottom end of the cylindrical jacking rod (10) is fixed with a return spring (15), and the top end of the cylindrical jacking rod (10) is provided with an anti-skid groove.

8. The plug-in patch panel according to claim 7, characterized in that The T-shaped guide metal sheet (13) of an overall horizontal T-shaped structure is also inserted in the strip-shaped perforation (1103), and two vertical guide insertion rods (14) are fixed to the lower surface of one end of the T-shaped guide metal sheet (13) close to the cylindrical jacking rod (10), and the upper surface of the metal clamping piece (11) is provided with guide holes (1106) on the front and rear sides close to the spring counterbore (1107) which are matched with the guide insertion rods (14); the T-shaped guide metal sheet (13) is tightly attached to the lower surface of the flat nut (12).

9. The plug-in patch panel according to claim 8, characterized in that The top end of the cylindrical jacking rod (10) pushes the T-shaped guide metal sheet (13) upward to contact the lower surface of the flat nut (12) when the cylindrical jacking rod (10) is not inserted with the external connecting wire (2), and a poking block is reserved near the top end of the side of the cylindrical jacking rod (10) away from the self-locking stud (1102).

10. The plug-in patch panel of claim 2, wherein, The top end of the cut shoulder protruding block (1104) is provided with a tensioning screw hole (1105), the top end outer wall of the hinged gate rod (8) is sleeved with a dust cover (4), the lower surface of the dust cover (4) is provided with a twist-preventing insertion block (403) in the middle which is matched with the hinged hole (801), the twist-preventing insertion block (403) is provided with a through hole in the middle, the top end of the dust cover (4) is provided with a counterbore (401) at the top end of the through hole, the through hole and the tensioning screw hole (1105) are matched in position and size, and an insulating nut (3) is screwed in the tensioning screw hole (1105); the top end of the dust cover (4) is provided with a vertical wire passing hole (402) near one end close to the C-shaped clamping groove (802).

Images