Rubber sleeve cable lead-in device for flame-proof low-voltage electric appliance

Abstract

The invention relates to the technical field of power electronic components, in particular to a rubber sleeve cable lead-in device for an explosion-proof low-voltage electrical appliance, which comprises a lead pipe, the lead pipe is mounted in a threading port of an explosion-proof low-voltage cabinet, screw connection pipes are fixed at two ends of the lead pipe, a rubber sleeve cable is inserted into the lead pipe, an air bag is mounted on the inner wall of the lead pipe, and a rubber sleeve is inserted into the air bag. After the air bag is inflated, the rubber sleeve cable is clamped, and after the lead pipe is inserted into a threading opening of the explosion-proof low-voltage cabinet, pipe bodies of the two screw joint pipes are sleeved with screw joint nuts; the explosion-proof low-voltage cabinet has the advantages that the air bag installed on the inner wall of the lead pipe expands after being inflated to wrap the rubber sleeve cable, air circulation inside and outside the explosion-proof low-voltage cabinet is blocked from the interior of the lead pipe, spreading of explosive gas mixtures is effectively prevented, and explosion-proof safety is improved.

Description

Technical Field

[0001] The invention relates to the technical field of power electronic components, in particular to a flameproof rubber-sheathed cable lead-in device for low-voltage electrical appliances. Background Art

[0002] In the field of flameproof low-voltage electrical equipment, the introduction of rubber-sheathed cables is a critical step. Flameproof low-voltage cabinets contain electrical equipment. To prevent the explosive gas mixture that may be generated inside the cabinet from spreading to the external environment through the cable entry during an explosion, or to prevent the external explosive gas mixture from entering the cabinet and causing danger, the cable entry device must ensure good sealing and fixation.

[0003] Traditional rubber-sheathed cable entry systems have numerous shortcomings. First, they struggle to effectively seal the air inside and outside explosion-proof low-voltage cabinets, failing to meet stringent explosion-proof requirements and posing a safety hazard. Second, rubber-sheathed cables are easily dragged, creating gaps between the cable and the threading port. This not only compromises the seal but can also cause electrical failures due to loose cables. Furthermore, traditional entry systems are complex, with each component performing a single function. Installation and maintenance are cumbersome, increasing both cost and complexity. Summary of the Invention

[0004] The object of the present invention is to provide a flameproof rubber-sheathed cable entry device for low-voltage electrical appliances to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a rubber-sheathed cable lead-in device for flameproof low-voltage electrical appliances, comprising a lead-in tube, which is installed in the wire threading port of a flameproof low-voltage cabinet, with screw tubes fixed at both ends of the lead-in tube, a rubber-sheathed cable inserted into the interior of the lead-in tube, an airbag installed on the inner wall of the lead-in tube, which clamps the rubber-sheathed cable after being inflated, and after the lead-in tube is inserted into the wire threading port of the flameproof low-voltage cabinet, screw nuts are sleeved on the tube bodies of the two screw tubes, a clamping block is inserted on the surface of the screw tube, and the nut pushes the clamping block to clamp the rubber-sheathed cable, and a traction piece is provided on the surface of the nut, which is fixed at one end of a plug ring, which is inserted into the screw tube, and the plug ring and the rubber-sheathed cable are sealed.

[0006] Preferably, the outer ring diameter of the screw tube is smaller than the outer ring diameter of the lead tube, and a reserved groove is provided on the inner wall of the lead tube. The reserved groove is an annular groove, and the airbag is fixed in the reserved groove. A plurality of elastic hoop pieces are fixed on the two parallel side walls of the reserved groove, and the elastic hoop pieces are arc-shaped pieces. The elastic hoop pieces limit the position of the airbag, and an air injection component is provided on the surface of the lead tube for inflating and deflating the airbag.

[0007] Preferably, the gas injection assembly includes a reserved opening and a rubber tube. The reserved opening is opened on the surface of the lead tube. The reserved opening is a "T"-shaped circular opening. The rubber tube is inserted into the reserved opening, and one end of the rubber tube is inserted and fixed on the airbag. The rubber tube and the airbag are connected. After the airbag is inflated, the tube head of the rubber tube is knotted and sealed.

[0008] Preferably, the side wall of the reserved opening is provided with an internal thread, the inner wall of the reserved opening is screwed with a sealing block, the side wall of the sealing block is provided with an external thread, a screw handle is fixed to the top of the sealing block, and the rubber tube is clamped between the sealing block and the reserved opening.

[0009] Preferably, a socket is provided on the surface of the screw tube, and there are multiple sockets, which are distributed in a circle with the screw tube as the central axis. The clamping block and the socket correspond one to one, and the clamping block is inserted into the socket. A rubber ring is fixed on the inner wall of the screw tube, and the rubber ring covers the multiple sockets. One end of the clamping block is fixed to the outer ring surface of the rubber ring.

[0010] Preferably, the height of the clamping block is greater than the height of the socket, and the other end of the clamping block is provided with an inclined surface. When the nut is pushed along the screw tube toward the lead tube, the nut pushes the clamping block along the inclined surface, and the clamping block stretches the rubber ring to deform, and the rubber ring is clamped between the rubber-sheathed cable and the clamping block.

[0011] Preferably, the nut is provided with an embedding groove on the side close to the lead tube, and the embedding groove is an annular groove. A rubber pad is fixed on the side of the nut close to the lead tube, and the rubber pad is an annular plate. The rubber pad covers the embedding groove, and an elastic support is installed inside the embedding groove. The elastic support supports the rubber pad to produce elastic deformation.

[0012] Preferably, the elastic support member includes an elastic support ring, which is a circular ring plate with a "U"-shaped cross-section. The inner ring plate and the outer ring plate of the elastic support ring are both arc-shaped plates, and one end of the elastic support ring is fixed to the inner wall of the mounting groove.

[0013] Preferably, the traction member includes a traction bar and a connecting ring. The traction bar is an arc-shaped plate. There are multiple traction bars. One end of the traction bar is fixed to the surface of the nut, and the other end of the traction bar is fixed to the surface of the connecting ring. A rubber clamp is fixed to the inner ring surface of the traction bar. The rubber clamp is clamped between the screw tube and the traction bar to produce elastic deformation. A paddle is fixed to the outer ring surface of the traction bar.

[0014] Preferably, the plug ring is a truncated cone-shaped tube, one end of the plug ring is fixed on the surface of the connecting ring, a rubber ring is fixed on the inner ring surface of the plug ring, the rubber ring is clamped between the plug ring and the rubber-sheathed cable to produce elastic deformation, and the outer diameter of the end of the plug ring close to the connecting ring is larger than the diameter of the threaded tube.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention proposes a rubber-sheathed cable lead-in device for explosion-proof low-voltage electrical appliances. The airbag installed on the inner wall of the lead-in tube expands and wraps the rubber-sheathed cable after being inflated, thereby blocking the air circulation inside and outside the explosion-proof low-voltage cabinet from the inside of the lead-in tube, effectively preventing the spread of explosive gas mixtures, and improving the explosion-proof safety; when the nut is pushed forward, the plug ring is driven by the traction member to be inserted into the screw tube, sealing the gap between the rubber-sheathed cable and the screw tube, and cooperating with the rubber ring on the inner ring surface of the plug ring to achieve sealing of the screw tube mouth, preventing air and dust from entering, and improving the overall sealing of the device; when the nut is pushed on the screw tube, the clamping block is squeezed and the rubber ring is tensioned to clamp the rubber-sheathed cable, thereby preventing the rubber-sheathed cable from being dragged at will and preventing gaps from being generated between the cable and the wire threading port, thereby ensuring the stability and safety of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention;

[0018] Figure 2 It is a side view of the structure of the present invention;

[0019] Figure 3 for Figure 2 Structural cross-section view at AA in the middle;

[0020] Figure 4 for Figure 3 A schematic diagram of the structure at center A;

[0021] Figure 5 for Figure 3 A magnified schematic diagram of the structure at point B in the middle;

[0022] Figure 6 for Figure 3 A magnified schematic diagram of the structure at point C in the middle;

[0023] Figure 7 This is a schematic diagram of the connection structure between the nut and the traction bar of the present invention;

[0024] Figure 8 It is a schematic diagram of the connection structure of the lead tube and the screw tube of the present invention.

[0025] In the figure: lead tube 1, screw tube 2, rubber-sheathed cable 3, reserved groove 4, air bag 5, reserved opening 6, rubber tube 7, sealing block 8, screw handle 9, elastic hoop 10, socket 11, clamping block 12, rubber ring 13, nut 14, mounting groove 15, rubber pad 16, elastic support ring 17, traction strip 18, plug ring 19, rubber ring 20, rubber clamp strip 21, paddle 22, connecting ring 23. DETAILED DESCRIPTION

[0026] In order to clearly and completely describe the objectives and technical solutions of the present invention and make the advantages more clearly understood, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, not all of them, and are only used to explain the embodiments of the present invention, not to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] See also Figures 1 to 8 The present invention provides a technical solution: a rubber-sheathed cable entry device for flameproof low-voltage electrical appliances, comprising a lead-in tube 1, which is installed in the wire threading port of a flameproof low-voltage cabinet, with screw tubes 2 fixed at both ends of the lead-in tube 1, a rubber-sheathed cable 3 plugged into the interior of the lead-in tube 1, an airbag 5 installed on the inner wall of the lead-in tube 1, which clamps the rubber-sheathed cable 3 after inflation, the outer ring diameter of the screw tube 2 is smaller than the outer ring diameter of the lead-in tube 1, a reserved groove 4 is opened on the inner wall of the lead-in tube 1, the reserved groove 4 is an annular groove, the airbag 5 is fixed in the reserved groove 4, and a plurality of elastic hoop pieces 10 are fixed on two parallel side walls of the reserved groove 4, and the elastic hoop pieces 10 are arc-shaped pieces The elastic hoop 10 limits the airbag 5, and an air injection component is provided on the surface of the lead tube 1 for inflating and deflating the airbag 5; the air injection component includes a reserved port 6 and a rubber tube 7, the reserved port 6 is opened on the surface of the lead tube 1, the reserved port 6 is a "T"-shaped circular port, the rubber tube 7 is inserted into the reserved port 6, and one end of the rubber tube 7 is plugged and fixed on the airbag 5, the rubber tube 7 is connected to the airbag 5, and the tube head of the rubber tube 7 is knotted and sealed after the airbag 5 is inflated; the side wall of the reserved port 6 is provided with an internal thread, and the inner wall of the reserved port 6 is screwed with a sealing block 8, the side wall of the sealing block 8 is provided with an external thread, and a screw handle 9 is fixed on the top of the sealing block 8, and the rubber tube 7 is clamped between the sealing block 8 and the reserved port 6.

[0028] When in use, first pass the rubber-sheathed cable 3 through the lead-in tube 1, then pinch the screw handle 9 by hand to screw and remove the sealing block 8 from the reserved opening 6, and inject air into the airbag 5 through the rubber tube 7 (you can blow with your mouth or use an air pump). After the airbag 5 expands, it supports the elastic hoop 10 and deforms. After the elastic hoop 10 is deformed, it clamps the rubber-sheathed cable 3, and after the airbag 5 expands, it wraps the rubber-sheathed cable 3, blocking the air circulation inside and outside the explosion-proof low-voltage cabinet from the inside of the lead-in tube 1. Before the elastic hoop 10 is deformed, the deflated airbag 5 is limited in the reserved groove 4 to prevent it from scattering. After the elastic hoop 10 is deformed, it clamps the rubber-sheathed cable 3, that is, the elastic hoop 10 has multiple uses.

[0029] After the lead-in tube 1 is inserted into the threading port of the explosion-proof low-voltage cabinet, screw nuts 14 are sleeved on the tube bodies of the two screw tubes 2. A clamping block 12 is inserted into the surface of the screw tube 2. The nut 14 pushes the clamping block 12 to clamp the rubber-sheathed cable 3. A socket 11 is opened on the surface of the screw tube 2. There are multiple sockets 11. The multiple sockets 11 are distributed in a circle with the screw tube 2 as the central axis. The clamping blocks 12 and the sockets 11 correspond one to one. The clamping blocks 12 are inserted into the sockets 11. A rubber ring 13 is fixed on the inner wall of the screw tube 2. The rubber ring 13 covers multiple sockets 11. One end of the clamping block 12 is fixed to the outer ring surface of the rubber ring 13; the height of the clamping block 12 is greater than the height of the socket 11, and the other end of the clamping block 12 is provided with an inclined surface. The nut 14 is pushed along the screw tube 2 toward the lead-in tube 1 during the process In the figure, the nut 14 pushes the clamping block 12 along the inclined surface, and the clamping block 12 stretches the rubber ring 13 to deform, and the rubber ring 13 is clamped between the rubber-sheathed cable 3 and the clamping block 12; the nut 14 is provided with an embedding groove 15 on the side close to the lead tube 1, and the embedding groove 15 is an annular groove. A rubber pad 16 is fixed on the side of the nut 14 close to the lead tube 1, and the rubber pad 16 is an annular plate. The rubber pad 16 covers the embedding groove 15, and an elastic support is installed inside the embedding groove 15. The elastic support supports the rubber pad 16 to produce elastic deformation; the elastic support includes an elastic support ring 17, and the elastic support ring 17 is a circular ring plate with a "U"-shaped cross-section. The inner ring plate and the outer ring plate of the elastic support ring 17 are both arc-shaped plates, and one end of the elastic support ring 17 is fixed to the inner wall of the embedding groove 15.

[0030] When in use, insert one end of the rubber-sheathed cable 3 into the threading port of the flameproof low-voltage cabinet, fix one end of the rubber-sheathed cable 3 to the electrical component, and then push the lead tube 1 into the threading port of the flameproof low-voltage cabinet. At this time, the two screw tubes 2 extend out of the two ends of the threading port of the flameproof low-voltage cabinet respectively. The two nuts 14 are respectively sleeved and screwed on the two screw tubes 2 and locked until the two nuts 14 are respectively against the two sides of the cabinet plate of the flameproof low-voltage cabinet. After the nuts 14 and the screw tubes 2 are locked, the elastic support ring 17 is deformed under pressure and retracts into the embedded groove 15, and the rubber pad 16 is clamped between the nut 14 and the cabinet plate of the flameproof low-voltage cabinet. The elastic support ring 17 and the rebound force of the rubber pad 16 support the nut 1 4, so that the nut 14 and the screw tube 2 are firmly screwed, and the elastic support ring 17 is close to the cabinet plate of the flameproof low-voltage cabinet, realizing air barrier on both sides of the inside and outside of the flameproof low-voltage cabinet; and in the process of the nut 14 being pushed on the screw tube 2, the nut 14 squeezes the clamping block 12 and tensions the rubber ring 13 to clamp the rubber-sheathed cable 3, preventing the rubber-sheathed cable 3 from being dragged at will, thereby avoiding the generation of a gap between the rubber-sheathed cable 3 and the threading port of the flameproof low-voltage cabinet, that is, the nut 14 not only realizes the installation and fixation of the lead-in tube 1, but also the nut 14 is against the cabinet plate side of the flameproof low-voltage cabinet to realize the sealing of the threading port, and the nut 14 pushes the clamping block 12 to clamp the rubber-sheathed cable 3, that is, the nut 14 has multiple uses.

[0031] A traction piece is provided on the surface of the nut 14, which is fixed at one end of a plug ring 19. The plug ring 19 is inserted into the screw tube 2, and the plug ring 19 and the rubber-sheathed cable 3 are sealed; the traction piece includes a traction bar 18 and a connecting ring 23. The traction bar 18 is an arc-shaped plate. There are multiple traction bars 18. One end of the traction bar 18 is fixed to the surface of the nut 14, and the other end of the traction bar 18 is fixed to the surface of the connecting ring 23. A rubber clamp 21 is fixed to the inner ring surface of the traction bar 18. The rubber clamp 21 is clamped between the screw tube 2 and the traction bar 18 to produce elastic deformation. A pick 22 is fixed to the outer ring surface of the traction bar 18; the plug ring 19 is a truncated cone-shaped tube. One end of the plug ring 19 is fixed to the surface of the connecting ring 23. A rubber ring 20 is fixed to the inner ring surface of the plug ring 19. The rubber ring 20 is clamped between the plug ring 19 and the rubber-sheathed cable 3 to produce elastic deformation. The outer diameter of the end of the plug ring 19 close to the connecting ring 23 is larger than the diameter of the screw tube 2.

[0032] During use, when the nut 14 is pushed along the screw tube 2, the nut 14 pulls the connecting ring 23 and the plug ring 19 to move through the traction bar 18, and the plug ring 19 is inserted into the screw tube 2, sealing the gap between the rubber-sheathed cable 3 and the screw tube 2, and firmly limiting the rubber-sheathed cable 3 in the screw tube 2 to prevent the rubber-sheathed cable 3 from being pulled. That is, the plug ring 19 not only seals the pipe mouth of the screw tube 2, but also cooperates with the rubber ring 20 to clamp and limit the rubber-sheathed cable 3.

[0033] The method of using the rubber-sheathed cable introduction device for flameproof low-voltage electrical appliances is as follows: first, pass the rubber-sheathed cable 3 through the lead-in tube 1. Pinch the screw handle 9 by hand and screw the sealing block 8 to remove it from the reserved opening 6. Inject air into the airbag 5 through the rubber tube 7, which can be done by blowing with your mouth or using an air pump. After the airbag 5 is inflated, the elastic hoop 10 is supported and deformed, and the elastic hoop 10 is deformed to clamp the rubber-sheathed cable 3. At the same time, the airbag 5 is inflated to wrap the rubber-sheathed cable 3, blocking the air circulation inside and outside the flameproof low-voltage cabinet from the inside of the lead-in tube 1. After the airbag 5 is inflated, tie a knot at the end of the rubber tube 7 to seal it. Screw the sealing block 8 into the reserved opening 6 again, and the rubber tube 7 is now clamped between the sealing block 8 and the reserved opening 6. Insert one end of the rubber-sheathed cable 3 into the wire threading port of the explosion-proof low-voltage cabinet. After one end of the rubber-sheathed cable 3 is fixed to the electrical component, push the lead-in tube 1 into the wire threading port of the explosion-proof low-voltage cabinet. At this time, the two screw tubes 2 extend out of the two ends of the wire threading port of the explosion-proof low-voltage cabinet. Sleeve the two nuts 14 and screw them on the two screw tubes 2 respectively. Tighten the nuts 14 until the two nuts 14 are respectively against the two sides of the cabinet panel of the explosion-proof low-voltage cabinet. In this process: the elastic support ring 17 is deformed under pressure and retracts into the embedded groove 15, and the rubber pad 16 is clamped between the nut 14 and the cabinet panel of the explosion-proof low-voltage cabinet. The elastic support ring 17 and the rebound force of the rubber pad 16 support the nut 14, so that the nut 14 and the screw tube 2 are firmly screwed, and the elastic support ring 17 is close to the cabinet panel of the explosion-proof low-voltage cabinet, realizing air barrier on both sides of the explosion-proof low-voltage cabinet. The nut 14 pushes the clamping block 12 along the inclined surface, and the clamping block 12 stretches the rubber ring 13 to deform it. The rubber ring 13 is clamped between the rubber-sheathed cable 3 and the clamping block 12, preventing the rubber-sheathed cable 3 from being dragged at will, thereby preventing a gap from forming between the rubber-sheathed cable 3 and the wire threading port of the flameproof low-voltage cabinet. When the nut 14 is pushed along the screw tube 2, the nut 14 pulls the connecting ring 23 and the plug ring 19 to move through the traction bar 18. The plug ring 19 is inserted into the screw tube 2, sealing the gap between the rubber-sheathed cable 3 and the screw tube 2, and firmly limiting the rubber-sheathed cable 3 in the screw tube 2 to prevent the rubber-sheathed cable 3 from being pulled. The rubber ring 20 on the inner ring surface of the plug ring 19 is clamped between the plug ring 19 and the rubber-sheathed cable 3 to produce elastic deformation, further playing a sealing and limiting role.

[0034] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A rubber-sheathed cable lead-in device for flameproof low-voltage electrical appliances, comprising a lead-in tube (1), which is installed in a wire threading port of a flameproof low-voltage cabinet, and is characterized in that: Both ends of the lead tube (1) are fixed with screw tubes (2), the inside of the lead tube (1) is plugged with a rubber-sheathed cable (3), the inner wall of the lead tube (1) is installed with an air bag (5), the air bag (5) clamps the rubber-sheathed cable (3) after being inflated, and after the lead tube (1) is inserted into the threading port of the flameproof low-voltage cabinet, the tube bodies of the two screw tubes (2) are sleeved with screw nuts (14), the surface of the screw tube (2) is plugged with a clamping block (12), the nut (14) pushes the clamping block (12) to clamp the rubber-sheathed cable (3), and the surface of the nut (14) is provided with a traction piece, which is fixed to one end of a plug ring (19), the plug ring (19) is plugged into the screw tube (2), and the plug ring (19) and the rubber-sheathed cable (3) are sealed.

2. The flameproof low-voltage electrical appliance rubber-sheathed cable entry device according to claim 1, characterized in that: The outer ring diameter of the screw tube (2) is smaller than the outer ring diameter of the lead tube (1); a reserved groove (4) is provided on the inner wall of the lead tube (1); the reserved groove (4) is an annular groove; the airbag (5) is fixed in the reserved groove (4); a plurality of elastic hoop pieces (10) are fixed on two parallel side walls of the reserved groove (4); the elastic hoop pieces (10) are arc-shaped pieces; the elastic hoop pieces (10) limit the position of the airbag (5); and an air injection component is provided on the surface of the lead tube (1) for inflating and deflating the airbag (5).

3. The flameproof low-voltage electrical appliance rubber-sheathed cable entry device according to claim 2, characterized in that: The gas injection assembly comprises a reserved opening (6) and a rubber tube (7). The reserved opening (6) is provided on the surface of the lead tube (1). The reserved opening (6) is a T-shaped circular opening. The rubber tube (7) is inserted into the reserved opening (6), and one end of the rubber tube (7) is inserted and fixed on the airbag (5). The rubber tube (7) and the airbag (5) are connected. After the airbag (5) is inflated, the tube head of the rubber tube (7) is knotted and sealed.

4. The flameproof low-voltage electrical appliance rubber-sheathed cable entry device according to claim 3, characterized in that: The side wall of the reserved opening (6) is provided with an internal thread, the inner wall of the reserved opening (6) is screwed with a sealing block (8), the side wall of the sealing block (8) is provided with an external thread, a screw handle (9) is fixed at the top end of the sealing block (8), and the rubber tube (7) is clamped between the sealing block (8) and the reserved opening (6).

5. The flameproof low-voltage electrical appliance rubber-sheathed cable entry device according to claim 1, characterized in that: The surface of the screw tube (2) is provided with a socket (11), and the sockets (11) are provided in plurality. The plurality of sockets (11) are distributed in a circle with the screw tube (2) as the central axis. The clamping block (12) corresponds to the sockets (11) one by one. The clamping block (12) is inserted into the sockets (11). A rubber ring (13) is fixed to the inner wall of the screw tube (2), and the rubber ring (13) covers the plurality of sockets (11). One end of the clamping block (12) is fixed to the outer ring surface of the rubber ring (13).

6. The flameproof low-voltage electrical appliance rubber-sheathed cable entry device according to claim 5, characterized in that: The height of the clamping block (12) is greater than the height of the socket (11), and the other end of the clamping block (12) is provided with an inclined surface. When the nut (14) is pushed along the screw tube (2) toward the lead tube (1), the nut (14) pushes the clamping block (12) along the inclined surface, and the clamping block (12) stretches the rubber ring (13) to deform, and the rubber ring (13) is clamped between the rubber-sheathed cable (3) and the clamping block (12).

7. The flameproof low-voltage electrical appliance rubber-sheathed cable entry device according to claim 1, characterized in that: The nut (14) is provided with an embedding groove (15) on one side close to the lead tube (1), and the embedding groove (15) is an annular groove. A rubber pad (16) is fixed on one side of the nut (14) close to the lead tube (1), and the rubber pad (16) is an annular plate. The rubber pad (16) covers the embedding groove (15), and an elastic support is installed inside the embedding groove (15). The elastic support supports the rubber pad (16) to generate elastic deformation.

8. The flameproof low-voltage electrical appliance rubber-sheathed cable entry device according to claim 7, characterized in that: The elastic support member includes an elastic support ring (17), which is a circular ring plate with a "U"-shaped cross section. The inner ring plate of the elastic support ring (17) and the outer ring plate of the elastic support ring (17) are both arc-shaped plates. One end of the elastic support ring (17) is fixed to the inner wall of the embedding groove (15).

9. The flameproof low-voltage electrical appliance rubber-sheathed cable entry device according to claim 1, characterized in that: The traction member comprises a traction bar (18) and a connecting ring (23). The traction bar (18) is an arc-shaped plate. A plurality of traction bars (18) are provided. One end of the traction bar (18) is fixed to the surface of the nut (14), and the other end of the traction bar (18) is fixed to the surface of the connecting ring (23). A rubber clamping strip (21) is fixed to the inner ring surface of the traction bar (18). The rubber clamping strip (21) is clamped between the screw tube (2) and the traction bar (18) to generate elastic deformation. A paddle (22) is fixed to the outer ring surface of the traction bar (18).

10. The flameproof low-voltage electrical appliance rubber-sheathed cable entry device according to claim 9, characterized in that: The plug ring (19) is a truncated cone-shaped tube. One end of the plug ring (19) is fixed to the surface of the connecting ring (23). A rubber ring (20) is fixed to the inner ring surface of the plug ring (19). The rubber ring (20) is clamped between the plug ring (19) and the rubber-sheathed cable (3) to generate elastic deformation. The outer diameter of the end of the plug ring (19) close to the connecting ring (23) is larger than the diameter of the screw tube (2).

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