Explosion-proof switch device for mining electric vehicle

Abstract

The invention provides an explosion-proof switch device for a mining electric vehicle, and belongs to the technical field of coal mine underground electric transportation equipment. The explosion-proof switch device for the mining electric vehicle comprises a cable access cavity, and the cable access cavity comprises an explosion-proof power cable access device and an explosion-proof communication cable access device. Each of the explosion-proof power cable access device and the explosion-proof communication cable access device comprises a cable lead-in sleeve, a sealing ring communicating pipe, a sealing gasket, a sealing gasket pressing plate and a fastening kit, the sealing gasket pressing plate comprises a first pressing plate and a second pressing plate which are distributed at the front end and the rear end of the sealing gasket, and the fastening kit comprises an arc-shaped clamping plate, an annular inclined groove, an inclined sliding block and a wedge-shaped ring. The switch device is connected with a mining storage battery and a power box, and is used for realizing the breaking of a power loop, realizing the overload and overcurrent protection of the power loop of a mining electric vehicle, and preventing an electrified conductor in the switch device from being exposed in a dangerous gas environment to cause an explosive potential safety hazard.

Description

Technical Field

[0001] The invention relates to the technical field of electric transportation equipment in underground coal mines, and in particular to an explosion-proof switch device for electric mining vehicles. Background Art

[0002] In the mine trackless electric transport vehicle, the switch device is the key part connecting the battery and the power box. With the continuous promotion of coal mine electric vehicle technology, the share of mine electric vehicles has gradually increased, and the technology used to connect the battery and the power box on mine electric vehicles has also been continuously developed.

[0003] At present, the technology for connecting the battery and the power box in mining electric vehicles generally adopts flameproof plug connectors or junction boxes, which connect the poles of the battery end and the power box through wiring at both ends. Although the flameproof plug connector or junction box can meet the requirements of "General Technical Conditions for Explosion-proof Special Power Supply Devices of Lead-acid Batteries in Coal Mines MT / T334-2008" and complete the connection of the power circuit of the battery and the power box, the flameproof plug connector or junction box has no protective function. When overload, overcurrent, or when the battery end or power box circuit fails, the battery and the power box cannot be disconnected, which brings hidden dangers to the safe production of coal mines. Summary of the invention

[0004] In order to solve the above technical problems, the present invention proposes an explosion-proof switch device for mining electric vehicles that connects a battery and a power box to realize the disconnection of the power circuit and realize overload and overcurrent protection of the power circuit of the mining electric vehicle, or when there is a fault in the battery end or the power box circuit, the power circuit is disconnected to avoid the exposure of live conductors to a dangerous gas environment, causing explosive safety hazards.

[0005] The technical solution of the present invention is achieved in this way:

[0006] An explosion-proof switch device for a mining electric vehicle, comprising a cable access cavity, an electrical device cavity, a partition, a first terminal and a second terminal, the cable access cavity comprising an explosion-proof power cable access device and an explosion-proof communication cable access device, the electrical device cavity comprising a main switch, an electromagnetic operating device, a detection device, a power supply device, a protection device, a delay device, and an explosion-proof cable quick connection device, the explosion-proof power cable access device and the explosion-proof communication cable access device both comprising a cable introduction sleeve, a sealing ring connecting tube, a sealing gasket, a sealing gasket pressure plate and a fastening kit, the front end of the cable introduction sleeve is threadedly connected to the rear end of the sealing ring connecting tube, the sealing gasket is arranged in the sealing ring connecting tube, and the sealing gasket pressure plate comprises a cable guide sleeve, a sealing ring connecting tube, a sealing ring connecting tube, and a sealing ring connecting tube. The first and second pressing plates at the front and rear ends of the gasket, the fastening kit includes an arc-shaped clamping plate, an annular bevel groove, an inclined sliding block and a wedge ring, the annular bevel groove is arranged on the inner wall surface of the cable guide sleeve, and the top ends of the inner wall surfaces on both sides of the annular bevel groove are inclined forward by 45°, the inclined sliding block is "T"-shaped as a whole, and the front and rear side surfaces of the inclined sliding block have the same inclination angle as the side wall of the annular bevel groove, the bottom end of the inclined sliding block is connected to the outer surface of the arc-shaped clamping plate, the front end of the outer surface of the arc-shaped clamping plate is provided with an arc-shaped guide bevel inclined downward by 45°, the wedge ring is arranged on the side surface of the first pressing plate facing the cable guide sleeve, and the rear end of the inner surface of the wedge ring is provided with an annular guide bevel matched with the guide bevel.

[0007] Furthermore, the first pressure plate includes a front ring plate, a rear ring plate and a force storage spring, the front ring plate is provided with an annular expansion groove, the front end of the rear ring plate is inserted into the annular expansion groove, both side surfaces of the annular expansion groove are provided with annular slide grooves, the front ends of the inner and outer side surfaces of the rear ring plate are fixedly installed with annular sliders, the front end of the rear ring plate is provided with an annular mounting groove, the force storage spring is located in the annular mounting groove, and the front end of the force storage spring is connected to the front end surface of the annular expansion groove, and the rear end of the force storage spring is connected to the The rear end face of the annular mounting groove is connected, the wedge ring is fixedly mounted on the rear end face of the rear ring plate, and the outer diameter of the wedge ring and the outer diameter of the rear ring plate are both adapted to the diameter of the inner wall surface of the outer side of the annular expansion groove, a front top ring is provided at the front end of the cable introduction sleeve, and the inner diameter of the front top ring is adapted to the outer diameter of the rear ring body, the front top ring is sleeved outside the wedge ring and the front end face of the front top ring abuts against the rear end face of the front ring plate, and the front end face of the cable introduction sleeve is spaced from the rear end face of the wedge ring.

[0008] Further, the inclined slider includes an inner block and an outer block which are distributed inside and outside. A lower extension ring body is provided at the bottom of the rear end face of the outer block. The bottom of the inner wall surface at the rear side of the annular inclined groove is an annular surface. When the cable inlet sleeve is threadedly connected to the sealing ring communication pipe, the rear end face of the lower extension ring body contacts the annular surface. A support ring is provided on the front inner wall surface of the annular inclined groove. A limiting ring is provided at the rear end of the support ring. The rear side surface of the support ring and the rear end face of the limiting ring are both set to have the same inclination angle as the inner wall surface of the annular inclined groove. When the lower extension ring body moves inward on the annular surface, the outer block pushes the support ring and the limiting ring to move forward.

[0009] Further, a guide rod is connected to the front end face of the support ring. A support spring is connected to the front end of the guide rod. When the support ring and the limiting ring move forward, the support spring is compressed.

[0010] Further, an outer top ring is sleeved outside the guide rod. The rear end face of the outer top ring is a conical surface. An "L"-shaped stop block is provided inside the cable inlet sleeve. The inner side surface at the rear end of the stop block is set to be an inclined surface adapted to the conical surface. A radial accommodation groove is provided inside the cable inlet sleeve. The stop block is slidably arranged in the radial accommodation groove. A radial spring is provided between the stop block and the outer inner wall surface of the radial accommodation groove (26). An axial telescopic groove is provided inside the cable inlet sleeve. The outer top ring is slidably arranged in the axial telescopic groove. When the outer top ring is located at the front end of the axial telescopic groove and the stop block is located at the innermost side of the radial accommodation groove, the rear end face of the stop block contacts the front end face of the outer top ring. A rear top member is provided at the front end of the cable inlet sleeve for controlling the displacement of the stop block.

[0011] Further, the rear top member includes a rear top rod and a ball. The rear end face of the rear top rod is set to be a conical surface. The inner side at the front end of the stop block is set to be an inclined surface adapted to the conical surface. The roller is embedded at the front end of the rear top rod. When the stop block is located at the innermost side of the radial telescopic groove, the roller extends out from the front end of the front top ring. When the front end of the front top ring contacts the rear end face of the front ring plate, the roller is located inside the front top ring, and the stop block is located at the outermost side inside the radial telescopic groove.

[0012] Further, the outer diameter of the rear end of the rear top rod is larger than that of the front end. The front top ring and the front end of the cable inlet sleeve are jointly provided with a displacement groove for the rear top rod to move axially. The rear end of the inner top wall of the displacement groove is communicated with the rear end of the inner bottom wall of the radial telescopic groove. The inner side surface at the rear end of the stop block can enter the displacement groove from the radial telescopic groove.

[0013] Furthermore, an annular wheel groove is provided on the front end surface of the support ring, and a roller is rotatably mounted on the tail end of the rear push rod, and the roller is located in the annular wheel groove.

[0014] Furthermore, a thread groove is provided at the rear end of the sealing ring connecting tube, an annular sleeve groove for sleeved on the outside of the front top plate is provided on the front inner wall surface of the thread groove, and the ball contacts the front end surface of the annular sleeve groove.

[0015] Furthermore, when the lower extension ring enters the annular surface, the arc-shaped clamping plate clamps the cable, a positioning protrusion is provided on the front end inclined surface of the arc-shaped clamping plate, and a positioning groove adapted to the width of the positioning protrusion is provided on the inclined surface of the wedge ring.

[0016] The present invention has the following beneficial effects:

[0017] 1. The explosion-proof switch device for mining electric vehicles provided by the present invention can connect the battery and the power box to realize the disconnection of the power circuit. At the same time, it can protect the power circuit when it is overloaded or overcurrent, or when the battery terminal or the power box fails, or when the plug and socket in the quick cable connection device on the switch device are disconnected, the power circuit is disconnected to prevent the conductor of the switch device from being exposed to the explosive dangerous environment underground.

[0018] 2. After fixing the cables, the explosion-proof power cable access device and the explosion-proof communication cable access device in the explosion-proof switch device for mining electric vehicles of the present invention can, during the subsequent use of the cables, when the cable surface softens or its internal protective layer breaks down, resulting in surface deformation and outer diameter changes, follow the deformation of the cable surface in real time and move, thereby always maintaining an effective clamping and fixing effect on the cable and providing better protection for the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a composition diagram of the switch device for mining electric vehicles of the present invention;

[0020] Figure 2 It is a structural diagram of the explosion-proof power cable access device and the explosion-proof communication cable access device of the present invention;

[0021] Figure 3 For the present invention Figure 2 A in the enlarged view;

[0022] Figure 4 is the electrical schematic diagram of the present invention;

[0023] Figure 5 This is a structural diagram of an explosion-proof socket of the present invention;

[0024] Figure 6This is a structural diagram of the explosion-proof plug of the present invention;

[0025] Figure 7 is a first terminal structure diagram of the present invention;

[0026] Figure 8 is a structural diagram of a second terminal of the present invention;

[0027] Fig. 9 It is a schematic diagram of the disassembly of the cable introduction sleeve and the first pressing plate of the present invention;

[0028] Fig.10 It is a schematic diagram of the arc-shaped clamping plate, the supporting ring, the limiting ring and the annular wheel groove of the present invention;

[0029] Fig.11 It is a schematic diagram of the electron introduction sleeve and the sealing ring connecting tube of the present invention.

[0030] In the figure: 1. Cable introduction sleeve; 2. Sealing ring connecting pipe; 3. Sealing pad; 4. First pressure plate; 4.1. Front ring plate; 4.2. Rear ring plate; 4.3. Accumulation spring; 5. Second pressure plate; 6. Arc clamping plate; 7. Annular inclined groove; 8. Inclined slider; 8.1. Inner block; 8.2. Outer block; 8.3. Lower extension ring; 9. Wedge ring; 10. Cable access cavity; 101. Explosion-proof power cable access device; 102. Explosion-proof communication cable access device; 102. Main switch; 104. Electromagnetic operating device; 105. Detection device; 106. Power supply device; 107. Protective device 108, delay device; 109, explosion-proof cable quick connection device; 1091, explosion-proof plug; 601, plug mother; 602, locking screw; 603, plug insulation pad; 604, gasket; 605, insulation pad set screw; 606, plug shield; 607, plug shield set screw; 608, cable pressure cap; 609, cable pressure sleeve; 610, cable pressure cap set screw; 611, cable compression seal; 612, first conductive rod; 613, second conductive rod; 1092, explosion-proof socket; 501, spiral ring; 502, spiral ring set screw; 503, plug Socket body; 504, socket insulating gasket; 505, gasket set screw; 506, first conductive rod sleeve; 507, second conductive rod sleeve; 508, retaining ring; 509, cable clamping plate; 5010, cable clamping bolt; 11, electrical component cavity; 12, partition; 13, first terminal; 701, insulating sleeve; 702, first insulating gasket; 703, terminal; 704, first copper nut; 705, copper washer group; 706, second copper nut; 707, current transformer; 708, first cavity partition plate; 14, second terminal; 801, copper rod; 802, insulating sleeve; 8 03. Second insulating pad; 804. Copper screw; 805. Second inter-cavity partition plate; 15. Annular expansion groove; 16. Annular slide groove; 17. Annular slider; 18. Annular mounting groove; 19. Front top ring; 20. Support ring; 21. Limiting ring; 22. Guide rod; 23. Support spring; 24. Outer top ring; 25. Block; 26. Radial accommodating groove; 27. Radial spring; 28. Axial expansion groove; 29. ​​Rear top rod; 30. Ball; 31. Displacement groove; 32. Annular wheel groove; 33. Roller; 34. Threaded groove; 35. Annular sleeve groove; 36. Positioning protrusion; 37. Positioning slide groove. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] refer to Figure 1 As shown, an explosion-proof switch device for a mining electric vehicle includes a cable access chamber 10, an electrical device chamber 11, a partition 12, a first terminal 13 and a second terminal 14. The cable access chamber 10 includes an explosion-proof power cable access device 101 and an explosion-proof communication cable access device 102. The electrical device chamber 11 includes a main switch 103, an electromagnetic operating device 104, a detection device 105, a power supply device 106, a protection device 107, a delay device 108, and an explosion-proof cable quick connection device 109.

[0033] refer to Figure 4 As shown, the main switch 103 is located in the electrical device cavity 11, and is used to connect and disconnect the power circuit. When an overload, overcurrent or other fault occurs, the power circuit drawn from the first terminal 13 in the electrical device cavity 11 is disconnected.

[0034] The electromagnetic operating device 104 is located in the electrical device cavity 11 and is used to activate the disconnection signal on the main switch 103 to disconnect the main circuit.

[0035] The detection device 105 is located in the electrical device cavity 11, detects the current flowing through the DC bus of the first terminal 13, and sends the detection result to the communication cable to the power box.

[0036] The power supply device 106 is located in the electrical device cavity 11 and is used to convert high voltage electricity of the power supply into low voltage electricity for control power supply, thereby providing power for the electromagnetic operating device 104 , the detection device 105 , the protection device 107 and the delay device 108 .

[0037] The protection device 107 is located in the electrical device cavity 11 , receives the current detected by the detection device 105 through communication and performs calculation and judgment. When the DC bus current exceeds the protection threshold, the second action normally open contact is changed from open to closed, providing a signal to the electromagnetic operating device 104 .

[0038] The delay device 108 is located in the electrical device cavity 11 and is used for timing when the cable quick connection device is disconnected. The delay device 108 is powered by the power supply device 106. When the timing time is up, the delay device 108 assists the normally open contact 403 to close.

[0039] The explosion-proof cable quick connection device 109 is located in the electrical device cavity 11, and includes an explosion-proof plug 1091 and an explosion-proof socket 1092, wherein the explosion-proof socket 1092 is installed on the switch device, and the explosion-proof plug 1091 has a cable at the rear end, which is connected to the power box through the cable.

[0040] refer to Figure 5As shown, the explosion-proof socket 1092 includes a screw ring 501, a screw ring set screw 502, a socket body 503, a socket insulating gasket 504, a gasket set screw 505, a first conductive rod sleeve 506, a second conductive rod sleeve 507, a retaining ring 508, a cable clamping plate 509 and a cable clamping bolt 5010. The screw ring 501 is fastened to the explosion-proof housing by bolts, the socket body 503 is inserted into the inner hole of the screw ring 501, and the socket body 503 is fixed to the screw ring 501 by the screw ring set screw 502 and the step. The socket insulating gasket 504 is inserted into the socket body 503 and fixed to the socket body 503 by the gasket set screw 505 and the boss. The first conductive rod sleeve 506 and the second conductive rod sleeve 507 have a slot at one end and a hole at the other end, and are inserted into the socket insulating gasket 504, and the socket insulating gasket 504 is fixed by the boss and interference fit. The cables are inserted into the opening ends of the first conductive rod sleeve 506 and the second conductive rod sleeve 507, and the first conductive rod 612 and the second conductive rod 613 in the explosion-proof plug 1091 are inserted into the slotted ends. After the cables are inserted into the opening ends of the conductive rod sleeves, the cables are fixed by the cable clamping plate 509 and the cable clamping bolt 5010. The first conductive rod sleeve 506 is used to connect the first conductive rod 612 of the explosion-proof plug 1091, and the second conductive rod sleeve 507 is used to connect the second conductive rod 613 of the explosion-proof plug 1091. The length of the first conductive rod sleeve 506 is greater than that of the second conductive rod sleeve 507.

[0041] Flameproof joint surface 1 is the joint plane between the screw ring 501 and the explosion-proof shell, flameproof joint surface 2 is the joint plane between the screw ring 501 and the socket insulating gasket 504, flameproof joint surface 3 is the joint plane between the socket insulating gasket 504 and the plug mother 601, and explosion-proof joint surface 4 is the threaded joint surface between the screw ring 501 and the plug shield 606.

[0042] refer to Figure 6 As shown, the explosion-proof plug 1091 includes a plug mother body 601, a locking screw sleeve 602, a plug insulating gasket 603, a gasket 604, an insulating gasket set screw 605, a plug shield 606, a plug shield set screw 607, a cable pressure cap 608, a cable pressure sleeve 609, a cable pressure cap set screw 610, a cable compression seal 611, a first conductive rod 612 and a second conductive rod 613. The plug mother body 601 is fastened together by a boss, an insulating gasket set screw 605 and a locking screw sleeve 602, and a plug insulating gasket 603. The gasket 604 is used to adjust the fastening gap. The plug shield 606 is fixed together with the plug mother body 601 by a thread, a plug shield set screw 607, and a plug mother body 601. The cable gland 608 is fixed together with the plug shield 606 through threads, the cable gland set screws 610 , and the cable gland 609 is fixed together with the cable gland 608 through a cable compression sealing ring 611 .

[0043] The flameproof joint surface 1 is the threaded joint surface of the locking shield and the screw ring 501 of the explosion-proof socket 1092, the flameproof joint surface 2 is the threaded joint surface of the plug shield 606 and the plug mother 601, the flameproof joint surface 3 is the threaded joint surface of the cable pressure cap 608 and the plug shield 606, and the flameproof joint surface 4 is the threaded joint surface of the cable pressure sleeve 609 and the cable pressure cap 608.

[0044] When the explosion-proof plug 1091 is inserted into the explosion-proof socket 1092, the first conductive rod sleeve 506 in the explosion-proof socket 1092 and the first conductive rod 612 inside the explosion-proof plug 1091 are connected before the second conductive rod sleeve 507 inside the explosion-proof socket 1092 and the second conductive rod 613 inside the explosion-proof plug 1091; when the explosion-proof plug 1091 and the explosion-proof socket 1092 are disconnected, the first conductive rod sleeve 506 in the explosion-proof socket 1092 and the first conductive rod 612 in the explosion-proof plug 1091 are disconnected after the second conductive rod sleeve 507 inside the explosion-proof plug 1091 and the second conductive rod 613 inside the explosion-proof plug 1091.

[0045] refer to Figure 7 As shown, the first terminal 13 connects the power circuit of the cable access cavity 10 and the electrical device cavity 11, including an insulating sleeve 701, a first insulating gasket 702, a terminal 703, a first copper nut 704, a copper washer group 705, a second copper nut 706 and a current transformer 707. The insulating sleeve 701 is inserted into the first insulating gasket 702 to achieve insulation isolation between the copper terminal 703 and the first inter-cavity partition plate 708, and at the same time meet the creepage distance requirements in the explosion-proof requirements of the terminal 703 and the first inter-cavity partition plate 708. The terminal 703 is made of copper material, with threads at both ends, passing through the insulating sleeve 701 and the first insulating gasket 702, and the threaded end is screwed into the copper nut to fasten the insulating sleeve 701, the first insulating gasket 702 and the first inter-cavity partition plate 708. The first copper washer group 705, the second copper washer group 705 and the copper nut are used to fasten the copper nose of the cable. The joint portion between the insulating sleeve 701 and the first inter-cavity partition plate 708 and the joint portion between the insulating sleeve 701 and the terminal 703 are flameproof joint surfaces.

[0046] refer to Figure 8As shown, the second terminal 14 connects the communication cable of the cable access cavity 10 and the electrical device cavity 11, including a copper rod 801, an insulating sleeve 802, a second insulating pad 803 and a copper screw 804. The insulating sleeve 802 is inserted into the second insulating pad 803 to achieve insulation isolation between the copper screw 804 and the second cavity partition plate 805, while meeting the creepage distance requirements in the explosion-proof requirements of the copper screw 804 and the second cavity partition plate 805. There are threaded holes in the copper screw 804, which respectively connect the copper screws 804 at both ends of the cable access cavity 10 and the electrical device cavity 11. The copper screw 804 is pressed into the communication cable through the thread, and the connection and tightening of the insulating sleeve 802, the second insulating pad 803 and the second cavity partition plate 805 are achieved at the same time. The combined portion of the second insulating gasket 803, the insulating sleeve 701 and the second inter-cavity partition plate 805, the combined portion of the copper screw 804 and the insulating sleeve 701, and the combined portion of the copper screw 804 and the second insulating gasket 803 are flameproof joint surfaces.

[0047] Protection action steps: When the second conductive rod sleeve 507 and the second conductive rod 613 are connected, the main switch 103 is closed, the auxiliary normally open contact 1072 of the main switch 103 is closed, the protection device 107 is energized, the normally closed contact 1071 of the protection device 107 is disconnected, the normally open contact 1072 is closed, and the delay device 108 is energized to start timing. When the timing time has not expired, the normally open contact 403 of the delay device 108 is disconnected, and the electromagnetic operating device 104 is not energized. When the timing time expires, the normally open contact 403 of the delay device 108 is closed, the normally closed contact 1071 of the protection device 107 is disconnected, the electromagnetic operating device 104 is not energized, and the main circuit remains connected.

[0048] When the second conductive rod sleeve 507 and the second conductive rod 613 are connected, the second normally open contact 1073 of the protection device 107 or the power box protection normally open contact 405 is closed, the electromagnetic operating device 104 is energized, and the main switch 103 disconnects the main circuit.

[0049] When the second conductive rod sleeve 507 and the second conductive rod 613 are disconnected, the connection signal is disconnected, the normally closed contact 1071 of the protection device 107 is closed, the electromagnetic operating device 104 is energized, and the main switch 103 disconnects the main circuit.

[0050] refer to Figure 2 As shown, the explosion-proof power cable access device 101 is located in the cable access cavity 10, and explosion-proof power cables with different outer diameters are passed through the interior, and two cables are connected in parallel. One end of each cable is connected to the positive pole or negative pole of the battery, and the other end is connected to the first terminal 13 in the cable access cavity 10.

[0051] The explosion-proof communication cable access device 102 is located in the cable access cavity 10, and explosion-proof communication cables of different outer diameters pass through the interior. One end of the explosion-proof communication cable is connected to the battery management unit of the external battery of the switching device, and the other end is connected to the second terminal 14 in the cable access cavity 10 inside the switching device.

[0052] refer to Figure 3 As shown, the explosion-proof power cable access device 101 and the explosion-proof communication cable access device 102 both include a cable introduction sleeve 1, a sealing ring connecting tube 2, a sealing gasket 3, a sealing gasket pressure plate and a fastening kit. The front end of the cable introduction sleeve 1 is threadedly connected to the rear end of the sealing ring connecting tube 2. The sealing gasket 3 is arranged in the sealing ring connecting tube 2. The sealing gasket pressure plate includes a first pressure plate 4 and a second pressure plate 5 distributed at the front and rear ends of the sealing gasket 3. The fastening kit includes an arc clamping plate 6, an annular bevel groove 7, an inclined slider 8 and a wedge ring 9. The annular bevel groove 7 is opened at On the inner wall surface of the cable introduction sleeve 1, the top ends of the inner walls on both sides of the annular bevel groove 7 are inclined forward at 45°, the inclined sliding block 8 is in a "T" shape as a whole, and the front and rear side surfaces of the inclined sliding block 8 have the same inclination angle as the side walls of the annular bevel groove 7, the bottom end of the inclined sliding block 8 is connected to the outer surface of the arc-shaped clamping plate 6, and the front end of the outer surface of the arc-shaped clamping plate 6 is provided with an arc-shaped guide bevel inclined downward at 45°, the wedge ring 9 is arranged on the side surface of the first pressure plate 4 facing the cable introduction sleeve 1, and the rear end of the inner surface of the wedge ring 9 is provided with an annular guide bevel matched with the guide bevel.

[0053] The explosion-proof sealing ring connecting tube 2 is fixed to the switch device housing by welding. The cable guide sleeve 1 is made of carbon steel and has a thread at one end. The threaded end is screwed into the explosion-proof sealing ring connecting tube 2 and then compressed with the multi-layer sealing gasket 3. The length of the threaded end meets the explosion-proof joint surface requirements. The multi-layer sealing gasket 3 is made of flame-retardant nitrile rubber. The inside of the sealing gasket 3 is divided into multiple layers, and the layers are not completely connected. Power cables with different outer diameters pass through the inside. The inner diameter of the multi-layer sealing gasket 3 is adjusted by tearing off the interlayer seal. The sealing gasket pressure plate is used to compress the multi-layer sealing gasket 3. The tightening kit is used to compress the tail of the cable. The multi-layer sealing ring shown in the figure has three layers, which is only used to explain the example of the present invention.

[0054] In the process of installing the cable into the explosion-proof power cable access device 101 and the explosion-proof communication cable access device 102, in the process of threading the cable introduction sleeve 1 and the sealing ring connecting tube 2, the front end of the arc clamping plate 6 is squeezed by the wedge ring 9 and moves inward to approach the cable. When the cable introduction device is completely connected to the sealing ring connecting tube 2, the arc clamping plate 6 clamps the cable. In the above process, by using the cooperation of the annular bevel groove 7 and the inclined surface of the inclined slider 8, when the cable introduction sleeve 1 is displaced axially toward the sealing ring connecting tube 2, the arc clamping plate 6 only moves radially to clamp the cable, so that there will be no axial offset between the arc clamping plate 6 and the cable surface, preventing the arc clamping plate 6 from wearing the cable surface and causing wear or damage to the cable surface, which can better protect the cable. At the same time, multiple arc clamping plates 6 are clamped on the cable surface more evenly, so that the clamping force on each part of the cable is more uniform.

[0055] refer to Fig. 9 As shown, the first pressure plate 4 includes a front ring plate 4.1, a rear ring plate 4.2 and a force storage spring 4.3. The front ring plate 4.1 is provided with an annular telescopic groove 15, the front end of the rear ring plate 4.2 is inserted into the annular telescopic groove 15, both sides of the annular telescopic groove 15 are provided with annular slide grooves 16, the front ends of the inner and outer sides of the rear ring plate 4.2 are fixedly installed with annular sliders 17, the front end of the rear ring plate 4.2 is provided with an annular mounting groove 18, the force storage spring 4.3 is located in the annular mounting groove 18, and the front end of the force storage spring 4.3 is connected to the front end surface of the annular telescopic groove 15, and the force storage spring 4.3 is provided with a front end surface of the annular telescopic groove 15. The rear end of the force spring 4.3 is connected to the rear end face of the annular mounting groove 18, the wedge ring 9 is fixedly mounted on the rear end face of the rear ring plate 4.2, and the outer diameter of the wedge ring 9 and the outer diameter of the rear ring plate 4.2 are both adapted to the diameter of the inner wall surface of the outer side of the annular telescopic groove 15, the front end of the cable introduction sleeve 1 is provided with a front top ring 19, and the inner diameter of the front top ring 19 is adapted to the outer diameter of the rear ring body, the front top ring 19 is sleeved on the outside of the wedge ring 9 and the front end face of the front top ring 19 abuts against the rear end face of the front ring plate 4.1, and the front end face of the cable introduction sleeve 1 is spaced from the rear end face of the wedge ring 9.

[0056] During the process of connecting the cable guide sleeve 1 with the sealing ring connecting tube 2, the rear ring plate 4.2 squeezes the arc clamping plate 6 to clamp the cable. When the cable guide sleeve 1 is completely connected with the sealing ring connecting tube 2, the front end of the front top ring 19 abuts against the rear end surface of the front ring plate 4.1 to stably press the first pressure plate 4, and at the same time, the storage spring 4.3 is compressed. After the cable is fixed, in the subsequent cable application process, when the surface layer of the cable softens due to heat or the internal protective layer is fragmented, resulting in a decrease in the outer diameter of the cable, the elastic force of the storage spring 4.3 will cause the rear ring plate 4.2 to move backward and drive the arc clamping plate 6 to move inward to maintain the effect of clamping the cable. In addition, the elastic force of the storage spring 4.3 will maintain pressure on the sealing gasket 3 through the front ring plate 4.1. When the surface layer of the cable softens or the protective layer of the cable is fragmented, resulting in a change in the outer diameter of the cable, the force of the storage spring 4.3 is applied to the sealing gasket 3 through the front ring plate 4.1, thereby ensuring that the sealing gasket 3 can always effectively contact the cable surface and ensure the sealing effect.

[0057] refer to Figure 3 As shown, the inclined sliding block 8 includes an inner block 8.1 and an outer block 8.2 which are distributed inside and outside, a lower extension ring body 8.3 is arranged at the bottom of the rear end face of the outer block 8.2, the bottom of the inner wall surface on the rear side of the annular bevel groove 7 is an annular surface, and when the cable introduction sleeve 1 is threadedly connected with the sealing ring connecting tube 2, the rear end face of the lower extension ring body 8.3 contacts the annular surface, a support ring 20 is arranged on the front end inner wall surface of the annular bevel groove 7, a limit ring 21 is arranged at the rear end of the support ring 20, the rear side surface of the support ring 20 and the rear end face of the limit ring 21 are both arranged to have the same inclination angle as the inner wall surface of the annular bevel groove 7, and when the lower extension ring body 8.3 moves inward on the annular surface, the outer block 8.2 pushes the support ring 20 and the limit ring 21 to move forward.

[0058] When the cable guide sleeve 1 is completely connected to the sealing ring connecting tube 2, the lower extension ring body 8.3 moves to the annular surface, the front end of the outer slider moves to the conical surface of the support ring 20, and the arc clamping plate 6 clamps the cable. When the outer diameter of the cable decreases due to softening of the surface layer or fragmentation of the internal protective layer during subsequent use, so that the clamping force of the arc clamping plate 6 on the cable decreases, the storage spring 4.3 pushes the arc clamping plate 6 to continue to move inward through the rear ring plate 4.2 and maintains the state of clamping the cable. During the displacement of the arc clamping plate 6, the lower extension ring body 8.3 moves inward on the annular surface, and the outer block 8.2 pushes the support ring 20 forward while moving inward. The support ring 20 provides space for the outer block 8.2 to move inward by moving forward. In the above process, the rear end face of the limit ring 21 maintains a contact state with the front side face of the inner block 8.1 and guides the inclined slider 8.

[0059] refer to Figure 3As shown, a guide rod 22 is connected to the front end face of the support ring 20. A support spring 23 is connected to the front end of the guide rod 22. When the support ring 20 and the limit ring 21 move forward, the support spring 23 is compressed. In the initial state, the support spring 23 exerts a backward thrust on the support ring 20, making the inclined surface of the support ring 20 coincide with the inner wall surface of the front end of the annular inclined groove 7. In addition, after the cable is withdrawn from the cable inlet sleeve 1, the support spring 23 enables the support ring 20 to automatically reset.

[0060] Reference Figure 3 and Fig. 9 As shown, an outer top ring 24 is sleeved outside the guide rod 22. The rear end face of the outer top ring 24 is a conical surface. An "L"-shaped block 25 is arranged inside the cable inlet sleeve 1. The inner side surface of the rear end of the block 25 is arranged as an inclined surface adapted to the conical surface. A radial accommodation groove 26 is arranged inside the cable inlet sleeve 1. The block 25 is slidably arranged in the radial accommodation groove 26, and a radial spring 27 is arranged between the block 25 and the outer wall surface of the outer side of the radial accommodation groove (26). In the initial state, the elastic force of the radial spring 27 makes the block 25 at the innermost position of the radial accommodation groove 26. When the block 25 moves outward in the radial accommodation groove 26, the radial spring 27 is compressed.

[0061] An axial expansion groove 28 is arranged inside the cable inlet sleeve 1. The outer top ring 24 is slidably arranged in the axial expansion groove 28. When the outer top ring 24 is located at the front end of the axial expansion groove 28 and the block 25 is at the innermost position of the radial accommodation groove 26, the rear end face of the block 25 contacts the front end face of the outer top ring 24. A rear top member for controlling the displacement of the block 25 is arranged at the front end of the cable inlet sleeve 1.

[0062] In the initial state, the stopper 25 is stably located at the innermost position of the radial receiving groove 26 under the action of the radial spring 27. At this time, the stopper 25 is located at the front end of the outer top ring 24 and limits it. The outer top ring 24 is used to limit the guide rod 22, so that the support ring 20 is fixed in the initial position, so that the support ring 20 is stably maintained in a state of being flush with the inner wall surface of the front end of the annular bevel groove 7. After the stopper 25 moves outward in the radial receiving groove 26 and disengages from the outer top ring 24, the support ring 20 is maintained in the initial position under the action of the rear fixed spring, and the support spring 23 is compressed when the outer block 8.2 moves downward on the support ring 20 and pushes the support ring 20 to move forward. After the support ring 20 moves forward, the rear end inclined surface of the stopper 25 contacts the rear end conical surface of the outer top ring 24. When the support ring 20 loses the thrust to push forward, the elastic force of the support spring 23 drives the outer top ring 24 and the guide rod 22 to move backward. During this process, the outer top ring 24 pushes the stopper 25 outward to move, and the stopper 25 provides a channel for the guide rod 22 and the support ring 20 to reset. When the support ring 20 returns to its initial position, the stopper 25 moves inward under the action of the radial spring 27, and the rear end of the stopper 25 moves to the front side of the outer top ring 24 to re-fix the support ring 20.

[0063] When the cable introduction sleeve is connected to the sealing ring connecting tube 2, the rear top component is automatically pushed outward by the sealing ring connecting tube 2 so that the block 25 unlocks the support ring 20. Then, after the cable is put into use, if the outer diameter decreases due to softening of the surface or fragmentation of the internal protective layer, the elastic force of the force storage spring 4.3 moves the arc clamp 6 inward through the rear ring body to keep the cable clamped. During this process, the support ring 20 is forced to move forward and compress the support spring 23 to provide a channel for the arc clamp 6 to move inward.

[0064] refer to Figure 3 As shown, the rear top component includes a rear top rod 29 and a ball 30. The rear end face of the rear top rod 29 is set as a conical surface, the inner side of the front end of the stopper 25 is set as an inclined surface adapted to the conical surface, and the roller is embedded in the front end of the rear top rod 29. When the stopper 25 is located at the innermost side of the radial expansion groove, the roller extends from the front end of the front top ring 19. When the front end of the front top ring 19 contacts the rear end face of the front ring plate 4.1, the roller is located in the front top ring 19, and the stopper 25 is located at the outermost side in the radial expansion groove.

[0065] In the process of connecting the cable guide sleeve 1 with the sealing ring connecting tube 2, the ball 30 contacts the sealing ring connecting tube 2 and the cable guide sleeve 1 is continuously inserted into the sealing ring connecting tube 2. The ball 30 and the rear push rod 29 are both displaced backwards. At this time, the rear push rod 29 pushes the block 25 outwards, so that the block 25 unlocks the outer push ring 24. At the same time, when the cable guide sleeve 1 rotates and connects the sealing ring connecting tube 2, the roller 33 rolls in the sealing ring connecting tube 2, reducing the wear of the guide rod 22 and the sealing ring connecting tube 2.

[0066] refer to Figure 3 and Fig. 9 As shown, the outer diameter of the rear end of the rear push rod 29 is larger than the outer diameter of the front end, and the front top ring 19 and the front end of the cable guide sleeve 1 are jointly provided with a displacement groove 31 for axial displacement of the rear push rod 29, the rear end of the inner top wall of the displacement groove 31 is connected with the rear end of the inner bottom wall of the radial expansion groove, and the inner side surface of the rear end of the stop block 25 can enter the displacement groove 31 from the radial expansion groove.

[0067] In the initial state, the front end of the stopper 25 maintains contact with the rear push rod 29. At this time, the elastic force of the spring enables the stopper 25 to have a stable limiting effect on the rear top plate, thereby stably maintaining the ball 30 outside the front top ring 19. At the same time, when the stopper 25 moves inward and resets under the action of the radial spring 27, it drives the rear push rod 29 to move forward and reset.

[0068] refer to Fig.10 As shown, an annular wheel groove 32 is provided on the front end surface of the support ring 20, and a roller 33 is rotatably installed on the tail end of the rear push rod 29, and the roller 33 is located in the annular wheel groove 32. When the cable introduction sleeve 1 is connected to the sealing ring connecting pipe 2 by rotation, the roller 33 rolls in the annular wheel groove 32, and at the same time, the inclined slider 8 slides in the circumferential direction in the annular inclined groove 7, so that the arc clamping plate 6 does not need to rotate with the cable introduction sleeve 1, preventing the arc clamping plate 6 from generating circumferential friction with the cable surface during the cable clamping process, thereby better protecting the cable surface.

[0069] refer to Fig.11 As shown, a thread groove 34 is provided at the rear end of the sealing ring connecting pipe 2, and an annular sleeve groove 35 for sleeved on the outside of the front top plate is provided on the front inner wall surface of the thread groove 34, and the ball 30 contacts the front end surface of the annular sleeve groove 35. The thread groove 34 is used for threaded connection with the cable guide sleeve 1, and the ball 30 can roll on the front inner wall surface of the annular sleeve groove 35.

[0070] refer to Figure 3 , Fig. 9 and Fig.10As shown, when the lower extension ring enters the annular surface, the arc clamping plate 6 clamps the cable, and a positioning protrusion 36 is provided on the front inclined surface of the arc clamping plate 6, and a positioning groove 37 adapted to the width of the positioning protrusion 36 is provided on the inclined surface of the wedge ring 9. Before connecting the cable introduction sleeve 1 with the sealing ring connecting tube 2, the positioning protrusion 36 on each arc clamping plate 6 is inserted into the positioning groove 37 on the wedge ring 9, so that the wedge ring 9 can make the arc clamping plates 6 centrally symmetrically distributed in the cable introduction sleeve 1.

[0071] In the process of connecting cables using the above-mentioned explosion-proof power cable access device 101 and explosion-proof communication cable access device 102, first insert the positioning protrusions 36 on all the arc-shaped clamping plates 6 into the corresponding positioning grooves 37 on the wedge block, then insert the cable introduction sleeve 1 and the first pressure plate 4 into the sealing ring connecting tube 2, and then rotate the cable introduction sleeve 1 to connect with the sealing ring connecting tube 2. In the process of the cable introduction sleeve 1 continuously entering the sealing ring connecting tube 2, the elastic force of the force storage spring 4.3 applies an inward force to the arc-shaped clamping plate 6 through the rear ring plate 4.2, and the arc-shaped clamping plate 6 moves inward and clamps the cable, and the rear ring plate 4.2 is continuously inserted into the annular mounting groove 18, and the force storage spring 4.3 is continuously compressed until the front end of the rear ring plate 4.2 contacts the front end inner wall surface of the annular mounting groove 18. During the inward displacement of the arc clamping plate 6, under the action of the annular inclined groove 7 and the inclined sliding block 8, the arc clamping plate 6 will not undergo axial displacement and will not undergo displacement in the circumferential direction of the cable, thereby preventing damage to the cable surface during the cable clamping process.

[0072] When the cable guide sleeve 1 continuously enters the sealing ring connecting tube 2, the ball 30 contacts the front end inner wall surface of the annular sleeve groove 35, and then the rear push rod 29 moves backward and pushes the stopper 25 outward. When the cable guide sleeve 1 is completely connected with the sealing ring connecting tube 2, the rear end of the stopper 25 is separated from the outer top ring 24. At this time, the support ring 20 is unlocked, and the front side surface of the outer block 8.2 moves to the rear side surface of the support block, and the lower extension ring body 8.3 moves to the annular surface.

[0073] During the process of putting the cable into use, if the cable surface softens or the internal protective layer breaks, resulting in a decrease in the hardness of the portion of the cable clamped by the arc clamp 6, then the rear ring plate 4.2 moves backward under the action of the force storage spring 4.3 and pushes the arc clamp 6 to move inward. At this time, the arc clamp 6 moves radially inward in the cable guide sleeve 1, and the support ring 20 is continuously compressed by the support spring 23 under the action of the outer block 8.2. In this way, it is ensured that the arc clamp 6 can always stably clamp the cable as the hardness of the cable surface changes.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An explosion-proof switch device for a mining electric vehicle, characterized in that: The invention comprises a cable access cavity (10), an electrical device cavity (11), a partition (12), a first terminal (13) and a second terminal (14); the cable access cavity (10) comprises an explosion-proof power cable access device (101) and an explosion-proof communication cable access device (102); the electrical device cavity (11) comprises a main switch (103), an electromagnetic operating device (104), a detection device (105), a power supply device (106), a protection device (107), a delay device (108) and an explosion-proof cable quick connection device (109); the explosion-proof power cable access device (101) and the explosion-proof communication cable access device (102) both comprise a cable introduction sleeve (1), a sealing ring connecting tube (2), a sealing gasket (3), a sealing gasket pressure plate and a fastening kit; the front end of the cable introduction sleeve (1) is threadedly connected to the rear end of the sealing ring connecting tube (2); the sealing gasket (3) is arranged in the sealing ring connecting tube (2); The sealing gasket pressure plate comprises a first pressure plate (4) and a second pressure plate (5) distributed at the front and rear ends of the sealing gasket (3); the fastening kit comprises an arc-shaped clamping plate (6), an annular bevel groove (7), an inclined slider (8) and a wedge ring (9); the annular bevel groove (7) is arranged on the inner wall surface of the cable guide sleeve (1), and the top ends of the inner wall surfaces on both sides of the annular bevel groove (7) are inclined forward by 45 degrees; the inclined slider (8) is in a "T" shape as a whole, and the front and rear side surfaces of the inclined slider (8) have the same inclination angle as the side wall of the annular bevel groove (7); the bottom end of the inclined slider (8) is connected to the outer surface of the arc-shaped clamping plate (6); the front end of the outer surface of the arc-shaped clamping plate (6) is provided with an arc-shaped guide bevel surface inclined downward by 45 degrees; the wedge ring (9) is arranged on a side surface of the first pressure plate (4) facing the cable guide sleeve (1), and the rear end of the inner surface of the wedge ring (9) is provided with an annular guide bevel surface adapted to the guide bevel surface.

2. According to claim 1, an explosion-proof switch device for a mining electric vehicle is characterized in that: The first pressure plate (4) comprises a front ring plate (4.1), a rear ring plate (4.2) and a force storage spring (4.3); an annular expansion groove (15) is provided in the front ring plate (4.1); the front end of the rear ring plate (4.2) is inserted into the annular expansion groove (15); annular sliding grooves (16) are provided on both side surfaces of the annular expansion groove (15); annular sliding blocks (17) are fixedly installed at the front ends of the inner and outer side surfaces of the rear ring plate (4.2); an annular mounting groove (18) is provided at the front end of the rear ring plate (4.2); the force storage spring (4.3) is located in the annular mounting groove (18); and the front end of the force storage spring (4.3) is connected to the front end surface of the annular expansion groove (15); The rear end of the spring (4.3) is connected to the rear end face of the annular mounting groove (18); the wedge ring (9) is fixedly mounted on the rear end face of the rear ring plate (4.2); and the outer diameter of the wedge ring (9) and the outer diameter of the rear ring plate (4.2) are both matched with the diameter of the inner wall surface of the outer side of the annular telescopic groove (15); the front end of the cable introduction sleeve (1) is provided with a front top ring (19); and the inner diameter of the front top ring (19) is matched with the outer diameter of the rear ring body; the front top ring (19) is sleeved outside the wedge ring (9) and the front end face of the front top ring (19) abuts against the rear end face of the front ring plate (4.1); and the front end face of the cable introduction sleeve (1) and the rear end face of the wedge ring (9) are spaced apart.

3. The explosion-proof switch device for mining electric vehicles according to claim 2, characterized in that: The inclined sliding block (8) comprises an inner block (8.1) and an outer block (8.2) which are distributed inside and outside. A lower extension ring body (8.3) is arranged at the bottom of the rear end surface of the outer block (8.2). The bottom of the inner wall surface of the rear side of the annular inclined groove (7) is an annular surface. When the cable guide sleeve (1) is threadedly connected with the sealing ring connecting pipe (2), the rear end surface of the lower extension ring body (8.3) contacts the annular surface. A support ring (20) is arranged on the front end inner wall surface of the annular inclined groove (7). A limit ring (21) is arranged at the rear end of the support ring (20). The rear side surface of the support ring (20) and the rear end surface of the limit ring (21) are both arranged to have the same inclination angle as the inner wall surface of the annular inclined groove (7). When the lower extension ring body (8.3) moves inward on the annular surface, the outer block (8.2) pushes the support ring (20) and the limit ring (21) to move forward.

4. The explosion-proof switch device for mining electric vehicles according to claim 3, characterized in that: The front end surface of the support ring (20) is connected to a guide rod (22), the front end of the guide rod (22) is connected to a support spring (23), and the support spring (23) is compressed when the support ring (20) and the limiting ring (21) move forward.

5. The explosion-proof switch device for mining electric vehicles according to claim 4, characterized in that: An outer top ring (24) is sleeved outside the guide rod (22). The rear end face of the outer top ring (24) is a conical surface. A "C"-shaped stop block (25) is arranged inside the cable inlet sleeve (1). The inner side face at the rear end of the stop block (25) is set as an inclined surface adapted to the conical surface. A radial receiving groove (26) is arranged inside the cable inlet sleeve (1). The stop block (25) is slidably arranged in the radial receiving groove (26), and a radial spring (27) is arranged between the stop block (25) and the outer inner wall surface of the radial receiving groove (26). An axial telescopic groove (28) is arranged inside the cable inlet sleeve (1). The outer top ring (24) is slidably arranged in the axial telescopic groove (28). When the outer top ring (24) is located at the front end of the axial telescopic groove (28) and the stop block (25) is located at the innermost side of the radial receiving groove (26), the rear end face of the stop block (25) contacts the front end face of the outer top ring (24). A rear pushing component for controlling the displacement of the stop block (25) is arranged at the front end of the cable inlet sleeve (1).

6. The explosion-proof switch device for mining electric vehicles according to claim 5, characterized in that: The rear pushing component includes a rear pushing rod (29) and a ball (30). The rear end face of the rear pushing rod (29) is set as a conical surface. The inner side at the front end of the stop block (25) is set as an inclined surface adapted to the conical surface. The roller is embedded at the front end of the rear pushing rod (29). When the stop block (25) is located at the innermost side of the radial telescopic groove, the roller extends out from the front end of the front top ring (19). When the front end of the front top ring (19) contacts the rear end face of the front ring plate (4.1), the roller is located inside the front top ring (19), and the stop block (25) is located at the outermost side inside the radial telescopic groove.

7. An explosion-proof switch device for mining electric vehicles according to claim 6, characterized in that: The outer diameter of the rear end of the rear pushing rod (29) is larger than that of the front end. A displacement groove (31) for the rear pushing rod (29) to axially displace is jointly opened at the front end of the front top ring (19) and the cable inlet sleeve (1). The rear end of the inner top wall of the displacement groove (31) is communicated with the rear end of the inner bottom wall of the radial telescopic groove, and the inner side face at the rear end of the stop block (25) can enter the displacement groove (31) from the radial telescopic groove.

8. The explosion-proof switch device for mining electric vehicles according to claim 6, characterized in that: An annular wheel groove (32) is opened on the front end face of the support ring (20). A roller (33) is rotatably installed at the tail end of the rear pushing rod (29), and the roller (33) is located inside the annular wheel groove (32).

9. The explosion-proof switch device for mining electric vehicles according to claim 6, characterized in that: A threaded groove (34) is opened at the rear end of the sealing ring connecting pipe (2). An annular sleeve groove (35) for sleeving outside the front top plate is opened on the inner wall surface at the front end of the threaded groove (34), and the ball (30) contacts the front end face of the annular sleeve groove (35).

10. The explosion-proof switch device for mining electric vehicles according to claim 3, characterized in that: When the lower extension ring enters the annular surface, the arc-shaped clamping plate (6) clamps the cable. A positioning protrusion (36) is arranged on the front inclined surface of the arc-shaped clamping plate (6). A positioning sliding groove (37) with a width adapted to the positioning protrusion (36) is arranged on the inclined surface of the wedge-shaped ring (9).

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