An explosion-proof switch device for mine electric vehicle

Abstract

The application provides a mine electric vehicle explosion-proof switch device, and belongs to the technical field of underground coal mine electric transport equipment. The mine electric vehicle explosion-proof switch device comprises a cable access cavity, the cable access cavity comprises an explosion-proof power cable access device and an explosion-proof communication cable access device, the explosion-proof power cable access device and the explosion-proof communication cable access device each comprise a cable lead-in sleeve, a sealing ring communication 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 key-shaped ring. The application connects a mine storage battery and a power box, is used for realizing the breaking of a power circuit, simultaneously realizing overload and overcurrent protection of a mine electric vehicle power circuit, avoiding that live conductors in the switch device are exposed in a dangerous gas environment, and causing an explosive safety hazard.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underground coal mine electric transport equipment, in particular to a mine-used explosion-proof switch device for electric vehicles. BACKGROUND

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

[0003] At present, the technology for connecting a battery and a power box in a mine-used electric vehicle generally adopts an explosion-proof latch connector or a junction box, and the explosion-proof latch connector and the junction box connect the pole of the battery end and the power box through two end wires. Although the explosion-proof latch connector or the junction box can meet the requirements of the "General Technical Conditions for Coal Mine Lead-acid Battery Explosion-proof Special Power Device MT / T334-2008" and complete the connection of the power loop of the battery and the power box, the explosion-proof latch connector or the junction box has no protective function, and when there is an overload, overcurrent, or when the battery end or the power box loop has a fault, it cannot realize the disconnection between the battery and the power box, which brings hidden dangers to the safety production of coal mines. SUMMARY

[0004] To solve the above technical problems, the present application proposes a mine-used explosion-proof switch device for electric vehicles, which connects a battery and a power box, realizes the disconnection of the power loop, and at the same time realizes the overload and overcurrent protection of the power loop of the mine-used electric vehicle, or when the battery end or the power box loop has a fault, disconnects the power loop, avoids the exposure of live conductors in a hazardous gas environment, and causes an explosive safety hazard.

[0005] The technical solution of the present application is realized as follows:

[0006] The utility model provides an explosion -proof switch device for mine electric car, including cable access cavity, electric appliance cavity, baffle, first terminal and second terminal, the cable access cavity includes explosion -proof power cable access device, explosion -proof communication cable access device, the electric appliance cavity includes main switch, electromagnetic operation device, detection device, power device, protection device, delay device, explosion -proof cable quick -connect device, explosion -proof power cable access device and explosion -proof communication cable access device all include cable lead -in cover, sealing ring intercommunication pipe, sealing pad, sealing pad pressure plate and fastening kit, the front end of cable lead -in cover is connected with the tail end of sealing ring intercommunication pipe threadedly, the sealing pad is arranged in sealing ring intercommunication pipe, the sealing pad pressure plate includes the first pressure plate and the second pressure plate of distribution in the front and rear ends of sealing pad, the fastening kit includes arc clamping plate, annular chute, inclined sliding block and contractile ring, the annular chute is set up on the inner wall surface of cable lead -in cover, and the top end of both sides inner wall surface of annular chute is inclined 45 DEG to the front, the inclined sliding block is whole and presents T, and the front and rear sides of inclined sliding block are with the same inclination angle of annular chute side wall, the bottom end of inclined sliding block is connected with the outer surface of arc clamping plate, the front end of arc clamping plate outer surface is equipped with the arc guide slope that is inclined 45 DEG downward, the contractile ring is arranged on the side of first pressure plate towards cable lead -in cover, and the rear end of inner surface of contractile ring is equipped with the annular guide slope that is adapted with guide slope.

[0007] Further, the first pressure plate includes a front ring plate, a rear ring plate, and a force storage spring. The front ring plate has an annular expansion slot formed therein. The front end of the rear ring plate is inserted into the annular expansion slot. Annular sliding grooves are formed on both sides of the annular expansion slot. Annular sliding blocks are fixedly installed on the front ends of the inner and outer sides of the rear ring plate. An annular mounting slot is formed on the front end of the rear ring plate. The force storage spring is located in the annular mounting slot, with the front end of the force storage spring connected to the front end face of the annular expansion slot and the rear end of the force storage spring connected to the rear end face of the annular mounting slot. The contractile ring is fixedly installed on the rear end face of the rear ring plate, with the outer diameter of the contractile ring and the outer diameter of the rear ring plate adapted to the diameter of the inner wall face of the annular expansion slot. The front end of the cable lead-in cover is provided with a front top ring, with the inner diameter of the front top ring adapted to the outer diameter of the rear ring body. The front top ring is sleeved outside the contractile ring, with the front end face of the front top ring abutting against the rear end face of the front ring plate. The front end face of the cable lead-in cover and the rear end face of the contractile ring have a spacing.

[0008] Further, the inclined sliding block comprises an inner block and an outer block distributed inside and outside, a bottom of a rear end surface of the outer block is provided with a lower extension ring body, an inner wall surface of a rear side of the ring-shaped inclined groove is a ring surface, and a rear end surface of the lower extension ring body is in contact with the ring surface when the cable lead-in sleeve is threadedly connected with the communication pipe of the sealing ring, a front end inner wall surface of the ring-shaped inclined groove is provided with a support ring, a rear end of the support ring is provided with a limiting ring, rear side surfaces of the support ring and the limiting ring are all provided with the same inclination angle as an inner wall surface of the ring-shaped inclined groove, and the outer block pushes the support ring and the limiting ring to move forward when the lower extension ring body moves inward on the ring surface.

[0009] Further, a front end surface of the support ring is connected with a guide rod, a front end of the guide rod is connected with a support spring, and the support spring is compressed when the support ring and the limiting ring move forward.

[0010] Further, an outer part of the guide rod is provided with an outer top ring, a rear end surface of the outer top ring is a tapered surface, an inner part of the cable lead-in sleeve is provided with a “” shaped stopper, an inner side surface of a rear end of the stopper is provided as a slope surface matched with the tapered surface, the cable lead-in sleeve is provided with a radial accommodation groove, the stopper is slidingly arranged in the radial accommodation groove, a radial spring is arranged between the stopper and an outer inner wall surface of the radial accommodation groove (26), the cable lead-in sleeve is provided with an axial extension groove, the outer top ring is slidingly arranged in the axial extension groove, a rear end surface of the stopper is in contact with a front end surface of the outer top ring when the outer top ring is located at a front end of the axial extension groove and the stopper is located at an innermost side of the radial accommodation groove, and a front end of the cable lead-in sleeve is provided with a rear top part for controlling displacement of the stopper.

[0011] Further, the rear top part comprises a rear top rod and a ball, a rear end surface of the rear top rod is provided as a tapered surface, an inner side of a front end of the stopper is provided as a slope surface matched with the tapered surface, the ball is embedded in a front end of the rear top rod, the ball extends out of the front end of the front top ring when the stopper is located at the innermost side of the radial extension groove, the ball is located in the front top ring when the front end of the front top ring is in contact with the rear end surface of the front ring plate, and the stopper is located at the outermost side in the radial extension groove.

[0012] Further, an outer diameter of the rear end of the rear top rod is larger than an outer diameter of the front end, the front top ring and the front end of the cable lead-in sleeve are provided with a displacement groove for axial displacement of the rear top rod, a rear end of an inner top wall of the displacement groove is in communication with a rear end of an inner bottom wall of the radial extension groove, and an inner side surface of the rear end of the stopper can enter the displacement groove from the radial extension groove.

[0013] Further, an annular wheel groove is formed on the front end surface of the support ring, a roller is rotatably installed at the tail end of the rear top rod, and the roller is located in the annular wheel groove.

[0014] Further, a threaded groove is formed at the rear end of the sealing ring connecting pipe, an annular sleeve groove for sleeving the outer part of the front top plate is formed on the front end inner wall surface of the threaded groove, and the ball contacts the front end surface of the annular sleeve groove.

[0015] Further, when the lower extension ring enters the annular surface, the arc-shaped clamping plate clamps the cable, a positioning protrusion is arranged on the front end inclined surface of the arc-shaped clamping plate, and a positioning sliding groove with a width matched with the positioning protrusion is arranged on the inclined surface of the wedge-shaped ring.

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

[0017] 1. The explosion-proof switch device for the mine electric vehicle provided by the present application can connect the storage battery and the power box, realize the breaking of the power circuit, protect when the power circuit is overloaded or overcurrent, or when the storage battery end or the power box has a fault, or when the plug and the socket in the quick cable connecting device on the switch device are disconnected, break the power circuit, and avoid that the conductor of the switch device is exposed in the explosive dangerous environment underground.

[0018] 2. After the explosion-proof power cable access device and the explosion-proof communication cable access device in the explosion-proof switch device for the mine electric vehicle fix the cable, in the subsequent use process of the cable, when the surface of the cable softens or the internal protective layer of the cable is crushed, causing the surface to deform and the outer diameter to change, the explosion-proof power cable access device and the explosion-proof communication cable access device can act in real time following the deformation of the surface of the cable, always maintain the effective clamping and fixing effect on the cable and have a better protection effect on the cable. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a composition diagram of the switch device for the mine electric vehicle of the present application;

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

[0021] Figure 3 It is an enlarged view of A in the present application; Figure 2

[0022] Figure 4 It is an electrical schematic diagram of the present application;

[0023] Figure 5 It is a structure diagram of the explosion-proof socket of the present application;

[0024] Figure 6 ​Structure diagram of the explosion-proof plug of the present application;

[0025] Figure 7 Structure diagram of the first terminal of the present application;

[0026] Figure 8 Structure diagram of the second terminal of the present application;

[0027] Figure 9 Split schematic diagram of the cable lead-in sleeve and the first pressing plate of the present application;

[0028] Figure 10 Schematic diagram of the arc-shaped clamping plate, the supporting ring, the limiting ring and the annular wheel groove of the present application;

[0029] Figure 11 Schematic diagram of the electronic lead-in sleeve and the sealing ring communication pipe of the present application.

[0030] In the figure: 1, cable lead-in sleeve; 2, sealing ring communication pipe; 3, sealing gasket; 4, first pressing plate; 4.1, front ring plate; 4.2, rear ring plate; 4.3, force storage spring; 5, second pressing plate; 6, arc-shaped clamping plate; 7, annular inclined chute; 8, inclined sliding block; 8.1, inner block body; 8.2, outer block body; 8.3, lower extension ring body; 9, key-shaped 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, protection device; 108, time delay device; 109, explosion-proof cable quick connection device; 1091, explosion-proof plug; 601, plug parent body; 602, locking screw; 603, plug insulating gasket; 604, gasket; 605, insulating gasket retaining screw; 606, plug shroud; 607, plug shroud retaining screw; 608, cable pressing cap; 609, cable pressing sleeve; 610, cable pressing cap retaining screw; 611, cable pressing sealing ring; 612, first conductive rod; 613, second conductive rod; 1092, explosion-proof socket; 501, coil; 502, coil retaining screw; 503, socket parent body; 504, socket insulating gasket; 505, gasket retaining screw; 506, first conductive rod sleeve; 507, second conductive rod sleeve; 508, retaining ring; 509, cable pressing plate; 5010, cable pressing bolt; 11, electrical component cavity; 12, partition plate; 13, first terminal; 701, insulating sleeve; 702, first insulating gasket; 703, terminal post; 704, first copper nut; 705, copper gasket set; 706, second copper nut; 707, current transformer; 708, first inter-cavity partition plate; 14, second terminal; 801, copper rod; 802, insulating sleeve; 803, second insulating gasket; 804, copper screw; 805, second inter-cavity partition plate; 15, annular telescopic groove; 16, annular sliding groove; 17, annular sliding block; 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, stop block; 26, radial accommodating groove; 27, radial spring; 28, axial telescopic 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 sliding groove. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0032] ReferenceFigure 1 As shown in the figure, a mine electric vehicle explosion-proof switch device, including cable access cavity 10, electrical device cavity 11, partition 12, first terminal 13 and second terminal 14, cable access cavity 10 includes explosion-proof power cable access device 101, explosion-proof communication cable access device 102, electrical device cavity 11 includes main switch 103, electromagnetic operating device 104, detection device 105, power supply device 106, protection device 107, delay device 108, explosion-proof cable quick connection device 109.

[0033] Reference Figure 4 As shown in the figure, the main switch 103 is located in the electrical device cavity 11, and the power circuit is turned on and off. When there is an overload, overcurrent and other faults, the power circuit 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 actuate 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 first terminal 13 DC bus, 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, which is used to convert the high voltage power supply into low voltage power for control power supply, and provides power for the electromagnetic operating device 104, detection device 105, protection device 107 and delay device 108.

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

[0038] The delay device 108 is located in the electrical device cavity 11, which is used to time when the cable quick connection device is disconnected. The power supply of the delay device 108 is provided by the power supply device 106. When the timing time is up, the delay device 108 auxiliary normally open contact 403 is closed.

[0039] The explosion-proof cable quick connection device 109 is located in the electrical device cavity 11, which includes explosion-proof plug 1091 and explosion-proof socket 1092. The explosion-proof socket 1092 is installed on the switch device, and the explosion-proof plug 1091 tail is connected with the cable to connect the power box.

[0040] Reference Figure 5As shown, the explosion-proof socket 1092 includes a coil 501, a coil set screw 502, a socket base 503, a socket insulating pad 504, a pad set screw 505, a first conductive rod sleeve 506, a second conductive rod sleeve 507, a stop ring 508, a cable pressing plate 509, and a cable pressing bolt 5010. The coil 501 is fastened to the explosion-proof shell by a bolt, the socket base 503 is sleeved into the inner hole of the coil 501, and the socket base 503 is fixed on the coil 501 by the coil set screw 502 and the step. The socket insulating pad 504 is sleeved into the socket base 503 and is fixed on the socket base 503 by the pad set screw 505 and the boss. The first conductive rod sleeve 506 and the second conductive rod sleeve 507 are inserted into the socket insulating pad 504 with one end slotted and one end holed, and are fixed by the boss and the interference fit. The first conductive rod sleeve 506 and the second conductive rod sleeve 507 are inserted into the cable at the holed end, and are inserted into the first conductive rod 612 and the second conductive rod 613 in the explosion-proof plug 1091 at the slotted end. After the cable is inserted into the holed end of the conductive rod sleeve, the cable is fixed by the cable pressing plate 509 and the cable pressing bolt 5010. The first conductive rod sleeve 506 is used to connect the first conductive rod 612 of the explosion-proof plug 1091, the second conductive rod sleeve 507 is used to connect the second conductive rod 613 of the explosion-proof plug 1091, and the length of the first conductive rod sleeve 506 is greater than that of the second conductive rod sleeve 507.

[0041] The explosion-proof joint surface 1 is the joint surface of the coil 501 and the explosion-proof shell, the explosion-proof joint surface 2 is the joint surface of the coil 501 and the socket insulating pad 504, the explosion-proof joint surface 3 is the joint surface of the socket insulating pad 504 and the plug base 601, and the explosion-proof joint surface 4 is the threaded joint surface of the coil 501 and the plug shield 606.

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

[0043] The explosion-proof joint surface 1 is the threaded joint surface of the locking shield and the screw thread 501 of the explosion-proof socket 1092, the explosion-proof joint surface 2 is the threaded joint surface of the plug shield 606 and the plug body 601, the explosion-proof joint surface 3 is the threaded joint surface of the cable pressing cap 608 and the plug shield 606, and the explosion-proof joint surface 4 is the threaded joint surface of the cable pressing sleeve 609 and the cable pressing 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 in the explosion-proof plug 1091 are connected first, and the second conductive rod sleeve 507 in the explosion-proof socket 1092 and the second conductive rod 613 in the explosion-proof plug 1091 are connected second. 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 second, and the second conductive rod sleeve 507 in the explosion-proof plug 1091 and the second conductive rod 613 in the explosion-proof plug 1091 are disconnected first.

[0045] Reference 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 post 703, a first copper nut 704, a copper gasket set 705, a second copper nut 706, and a current transformer 707. The insulating sleeve 701 is inserted into the first insulating gasket 702, achieving insulating isolation of the copper terminal post 703 and the first inter-cavity partition plate 708, while meeting the creepage distance requirement in the explosion-proof requirement of the copper terminal post 703 and the first inter-cavity partition plate 708. The terminal post 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 fastened by screwing 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 gasket set 705, the second copper gasket set 705, and the copper nut are used to fasten the copper nose for connecting the cable. The combined part of the insulating sleeve 701 and the first inter-cavity partition plate 708, and the combined part of the insulating sleeve 701 and the terminal post 703 are explosion-proof joint surfaces.

[0046] Reference Figure 8As shown, the second terminal 14 connects the communication cable between the cable access cavity 10 and the electrical device cavity 11, including a copper rod 801, an insulating sleeve 802, a second insulating gasket 803, and a copper screw rod 804. The insulating sleeve 802 is inserted into the second insulating gasket 803, achieving insulating isolation of the copper screw rod 804 and the second inter-cavity partition plate 805, while meeting the creepage distance requirement in the explosion-proof requirement of the copper screw rod 804 and the second inter-cavity partition plate 805. The copper screw rod 804 has a threaded hole, which connects the copper screw rods 804 at both ends of the cable access cavity 10 and the electrical device cavity 11. The copper screw rod 804 is screwed into the communication cable, while achieving connection and fastening of the insulating sleeve 802, the second insulating gasket 803, and the second inter-cavity partition plate 805. The combined part of the second insulating gasket 803, the insulating sleeve 701, and the second inter-cavity partition plate 805, the combined part of the copper screw rod 804 and the insulating sleeve 701, and the combined part of the copper screw rod 804 and the second insulating gasket 803 are explosion-proof combined surfaces.

[0047] Protection action step: 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 powered on, the normally closed contact 1071 of the protection device 107 is opened, the normally open contact 1072 is closed, and the time delay device 108 is powered on to start timing. When the timing time has not arrived, the normally open contact 403 of the time delay device 108 is opened, and the electromagnetic operating device 104 cannot be powered on. When the timing time arrives, the normally open contact 403 of the time delay device 108 is closed, the normally closed contact 1071 of the protection device 107 is opened, the electromagnetic operating device 104 cannot be powered on, 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 powered on, and the main switch 103 is opened.

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

[0050] Reference Figure 2 As shown, the explosion-proof power cable access device 101 is located in the cable access cavity 10, and passes through the explosion-proof power cable with different outer diameters inside, and adopts double cable parallel wiring. One end of each cable is connected to the positive or negative pole of the storage 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 internally passes through the explosion-proof communication cable with different outer diameters. One end of the explosion-proof communication cable is connected to the battery management unit of the external battery of the switch device, and the other end is connected to the second terminal 14 in the cable access cavity 10 inside the switch device.

[0052] Reference 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 guide sleeve 1, a sealing ring communication pipe 2, a sealing gasket 3, a sealing gasket pressing plate, and a fastening kit. The front end of the cable guide sleeve 1 is threadedly connected to the tail end of the sealing ring communication pipe 2. The sealing gasket 3 is arranged in the sealing ring communication pipe 2. The sealing gasket pressing plate includes a first pressing plate 4 and a second pressing plate 5 distributed at the front and rear ends of the sealing gasket 3. The fastening kit includes an arc-shaped clamping plate 6, an annular inclined groove 7, an inclined sliding block 8, and a contractive ring 9. The annular inclined groove 7 is formed 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 inclined groove 7 are inclined forward by 45°. The inclined sliding block 8 is in the shape of “T” as a whole, and the front and rear side surfaces of the inclined sliding block 8 have the same inclination angle as the side wall of the annular inclined groove 7. The bottom end of the inclined sliding block 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 slope inclined downward by 45°. The contractive ring 9 is arranged on the side surface of the first pressing plate 4 facing the cable guide sleeve 1, and the rear end of the inner surface of the contractive ring 9 is provided with an annular guide slope matched with the guide slope.

[0053] The explosion-proof sealing ring communication pipe 2 is fixed together with the shell of the switch device by welding. The cable guide sleeve 1 is made of carbon steel, one end of which is threaded. After the threaded end is screwed into the explosion-proof sealing ring communication pipe 2, the multi-layer sealing gasket 3 is compressed. The length of the threaded screwing meets the requirements of the explosion-proof joint surface. The multi-layer sealing gasket 3 is made of flame-retardant butyl rubber. The inner part of the sealing gasket 3 is divided into multiple layers, and the layers are not completely penetrated. The power cable with different outer diameters passes through the inside. The size of the inner diameter of the multi-layer sealing gasket 3 is adjusted by tearing the interlayer seal. The sealing gasket pressing plate is used to compress the multi-layer sealing gasket 3. The fastening kit is used to compress the tail part of the cable. The multi-layer sealing ring shown in the figure is three layers, which is only used to explain the example of the present application.

[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, the front end of the arc-shaped clamping plate 6 is extruded by the notch-shaped ring 9 to be displaced inward to approach the cable, and when the cable entry device is completely connected with the sealing ring communication pipe 2, the arc-shaped clamping plate 6 clamps and fixes the cable. In the above process, by cooperation of the annular inclined chute 7 and the inclined surface of the inclined sliding block 8, when the cable entry sleeve 1 is displaced axially into the sealing ring communication pipe 2, the arc-shaped clamping plate 6 only makes radial displacement to clamp the cable, so that the arc-shaped clamping plate 6 and the cable surface do not axially deviate, preventing the arc-shaped clamping plate 6 from wearing the cable surface to cause the cable surface to wear or damage, and better protecting the cable. At the same time, the plurality of arc-shaped clamping plates 6 are more evenly clamped on the cable surface, so that the clamping force on each part of the cable is more uniform.

[0055] Reference Figure 9 As shown, the first pressing 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 expansion slot 15, the front end of the rear ring plate 4.2 is inserted into the annular expansion slot 15, the two side surfaces of the annular expansion slot 15 are provided with annular sliding grooves 16, the front ends of the inner and outer side surfaces of the rear ring plate 4.2 are fixedly installed with annular sliding blocks 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 with the front end surface of the annular expansion slot 15, the rear end of the force storage spring 4.3 is connected with the rear end surface of the annular mounting groove 18, the notch-shaped ring 9 is fixedly installed on the rear end surface of the rear ring plate 4.2, and the outer diameter of the notch-shaped ring 9 and the outer diameter of the rear ring plate 4.2 are adapted to the diameter of the inner wall surface of the annular expansion slot 15, the front end of the cable entry 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 outside the notch-shaped ring 9, and the front end surface of the front top ring 19 abuts against the rear end surface of the front ring plate 4.1, and the front end surface of the cable entry sleeve 1 and the rear end surface of the notch-shaped ring 9 have a spacing.

[0056] In the process of connecting the cable lead-in sleeve 1 and the sealing ring communication pipe 2, the rear ring plate 4.2 extrudes the arc-shaped clamping plate 6 to clamp the cable, and when the cable lead-in sleeve 1 and the sealing ring communication pipe 2 are completely connected, the front end of the front top ring 19 abuts on the rear end surface of the front ring plate 4.1 to stably press the first pressing plate 4, and at the same time, the force storage spring 4.3 is compressed. After the cable is fixed, in the subsequent cable application process, when the cable surface layer softens or the internal protective layer is broken to cause the cable outer diameter to decrease, the elastic force of the force storage spring 4.3 will make the rear ring plate 4.2 displace backward and drive the arc-shaped clamping plate 6 to displace inward to keep the clamping effect on the cable. In addition, the elastic force of the force storage spring 4.3 will keep the pressure on the sealing gasket 3 through the front ring plate 4.1, and when the cable surface layer softens or the cable protective layer is broken to cause the cable outer diameter to change, the force of the force 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] Reference Figure 3 As shown, the inclined sliding block 8 includes an inner block body 8.1 and an outer block body 8.2 distributed inside and outside, the bottom of the rear end surface of the outer block body 8.2 is provided with a lower extension ring body 8.3, the bottom of the inner wall surface of the rear side of the annular inclined groove 7 is an annular surface, and when the cable lead-in sleeve 1 and the sealing ring communication pipe 2 are threadedly connected, the rear end surface of the lower extension ring body 8.3 contacts the annular surface, the front end inner wall surface of the annular inclined groove 7 is provided with a support ring 20, the rear end of the support ring 20 is provided with a limiting ring 21, the rear side surface of the support ring 20 and the rear end surface of the limiting ring 21 are both provided with the same inclination angle as the inner wall surface of the annular inclined groove 7, and when the lower extension ring body 8.3 displaces inward on the annular surface, the outer block body 8.2 pushes the support ring 20 and the limiting ring 21 to displace forward.

[0058] When the cable lead-in sleeve 1 and the sealing ring communication pipe 2 are completely connected, the lower extension ring body 8.3 moves to the annular surface, the front end of the outer sliding block moves to the tapered surface of the support ring 20, and the arc-shaped clamping plate 6 clamps the cable. When the cable diameter decreases due to the softening of the surface layer or the breaking of the internal protective layer in the subsequent use process, the force storage spring 4.3 pushes the arc-shaped clamping plate 6 to continue to displace inward and keep the state of clamping the cable, and in the displacement process of the arc-shaped clamping plate 6, the lower extension ring body 8.3 displaces inward on the annular surface, and the outer block body 8.2 pushes the support ring 20 forward while displacing inward, and the support ring 20 provides space for the inward displacement of the outer block body 8.2 by displacing forward. In the above process, the rear end surface of the limiting ring 21 and the front side surface of the inner block body 8.1 keep in contact and guide the inclined sliding block 8.

[0059] Reference Figure 3As shown, the front end surface of the support ring 20 is connected with a guide rod 22, the front end of the guide rod 22 is connected with a support spring 23, and the support spring 23 is compressed when the support ring 20 and the limiting ring 21 are displaced forward. In the initial state, the support spring 23 exerts a backward pushing force on the support ring 20, so that the inclined surface of the support ring 20 is consistent with the inner wall surface of the front end of the annular inclined groove 7. In addition, after the cable is pulled out from the cable lead-in sleeve 1, the support spring 23 enables the support ring 20 to automatically reset.

[0060] Reference Figure 3 and Figure 9 As shown, the outer part of the guide rod 22 is sleeved with an outer top ring 24, the rear end surface of the outer top ring 24 is a tapered surface, the inner part of the cable lead-in sleeve 1 is provided with a "∅" shaped stopper 25, the inner surface of the rear end of the stopper 25 is set as an inclined surface matched with the tapered surface, the cable lead-in sleeve 1 is provided with a radial accommodation groove 26, the stopper 25 is slidingly arranged in the radial accommodation groove 26, and a radial spring 27 is arranged between the stopper 25 and the outer inner wall surface of the radial accommodation groove 26. In the initial state, the elastic force of the radial spring 27 enables the stopper 25 to be at the innermost position of the radial accommodation groove 26, and the radial spring 27 is compressed when the stopper 25 is displaced outward in the radial accommodation groove 26.

[0061] The cable lead-in sleeve 1 is provided with an axial telescopic groove 28, the outer top ring 24 is slidingly arranged in the axial telescopic groove 28, when the outer top ring 24 is at the front end of the axial telescopic groove 28 and the stopper 25 is at the innermost position of the radial accommodation groove 26, the rear end surface of the stopper 25 is in contact with the front end surface of the outer top ring 24, and the front end of the cable lead-in sleeve 1 is provided with a rear top part for controlling the displacement of the stopper 25.

[0062] In the initial state, the stopper 25 is stably located in the innermost position of the radial accommodating 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 limits the guide rod 22, and then the support ring 20 is fixed in the initial position, so that the support ring 20 is stably kept in the state of being flush with the inner wall surface of the front end of the annular chute 7. When the stopper 25 is displaced outward in the radial accommodating groove 26 and is separated from the outer top ring 24, the support ring 20 is kept in the initial position under the action of the rear fixing spring, and the support spring 23 is compressed in the process that the outer block 8.2 is displaced downward on the support ring 20 and pushes the support ring 20 to displace forward. After the support ring 20 displaces forward, the rear end inclined surface of the stopper 25 is in contact with the rear end tapered surface of the outer top ring 24, and when the support ring 20 loses the pushing force for being pushed forward, the elastic force of the support spring 23 drives the outer top ring 24 and the guide rod 22 to displace backward, in this process, the outer top ring 24 pushes the stopper 25 to displace outward, and the stopper 25 provides a channel for the reset of the guide rod 22 and the support ring 20. When the support ring 20 returns to the initial position, the stopper 25 displaces 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 lead-in sleeve is connected with the sealing ring communication pipe 2, the rear top part is automatically pushed outward by the sealing ring communication pipe 2 to push the stopper 25 outward to unlock the support ring 20, and then when the outer diameter becomes smaller due to surface softening or internal protection layer fragmentation after the cable is put into use, the elastic force of the force storage spring 4.3 keeps the arc-shaped clamp plate 6 to displace inward to keep clamping the cable in the process that the support ring 20 is forced to displace forward and compresses the support spring 23 to provide a channel for the inward displacement of the arc-shaped clamp plate 6.

[0064] Reference Figure 3 As shown, the rear top part includes a rear top rod 29 and a ball 30, the rear end surface of the rear top rod 29 is set as a tapered surface, the inner side of the front end of the stopper 25 is set as an inclined surface matched with the tapered surface, the roller is embedded in the front end of the rear top rod 29, when the stopper 25 is located in the innermost position of the radial telescopic groove, the roller protrudes from the front end of the front top ring 19, when the front end of the front top ring 19 is in contact with the rear end surface of the front ring plate 4.1, the roller is located in the front top ring 19, and the stopper 25 is located in the outermost position of the radial telescopic groove.

[0065] In the process of connecting the cable lead-in sleeve 1 with the sealing ring communication pipe 2, the ball 30 contacts the sealing ring communication pipe 2 and is displaced backward during the continuous insertion of the cable lead-in sleeve 1 into the sealing ring communication pipe 2, at this time, the rear top rod 29 pushes the block 25 outward, so that the block 25 unlocks the outer top ring 24. At the same time, in the process of rotating and connecting the cable lead-in sleeve 1 with the sealing ring communication pipe 2, the roller 33 rolls in the sealing ring communication pipe 2, reducing the wear of the guide rod 22 and the sealing ring communication pipe 2.

[0066] Referring to Figure 3 and Figure 9 , the rear end outer diameter of the rear top rod 29 is larger than the front end outer diameter, and the front top ring 19 and the front end of the cable lead-in sleeve 1 are jointly provided with a displacement groove 31 for axial displacement of the rear top rod 29, 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 expansion groove, and the inner side surface of the rear end of the block 25 can enter the displacement groove 31 from the radial expansion groove.

[0067] In the initial state, the front end of the block 25 keeps in contact with the rear top rod 29, at this time, the elastic force of the spring makes the block 25 have a stable limiting effect on the rear top plate, so that the ball 30 is stably kept outside the front top ring 19. At the same time, in the process of inward displacement and resetting of the block 25 under the action of the radial spring 27, the rear top rod 29 is driven to displace forward and reset.

[0068] Referring to Figure 10 , the front end surface of the support ring 20 is provided with an annular wheel groove 32, and the tail end of the rear top rod 29 is rotatably installed with a roller 33, and the roller 33 is located in the annular wheel groove 32. In the process of connecting the cable lead-in sleeve 1 with the sealing ring communication pipe 2 by rotation, the roller 33 rolls in the annular wheel groove 32, and at the same time, the inclined sliding block 8 slides in the circumferential direction in the annular inclined groove 7, so that the arc-shaped clamping plate 6 does not need to rotate with the cable lead-in sleeve 1, preventing the arc-shaped clamping plate 6 from generating circumferential friction between the cable surface layer during clamping the cable, and better protecting the cable surface layer.

[0069] Referring to Figure 11 , the rear end of the sealing ring communication pipe 2 is provided with a threaded groove 34, the front end inner wall surface of the threaded groove 34 is provided with an annular sleeve groove 35 for sleeving outside the front top plate, and the ball 30 contacts the front end surface of the annular sleeve groove 35. The threaded groove 34 is used for threaded connection with the cable lead-in sleeve 1, and the ball 30 can roll on the front end inner wall surface of the annular sleeve groove 35.

[0070] Referring to Figure 3 , Figure 9 and Figure 10As shown, when the lower extension ring enters the annular surface, the arc-shaped clamping plates 6 clamp the cable, and the front end of the arc-shaped clamping plates 6 is provided with a positioning protrusion 36, and the inclined surface of the wedge-shaped ring 9 is provided with a positioning sliding groove 37 with a width matched with the positioning protrusion 36. Before connecting the cable guide sleeve 1 and the sealing ring communication pipe 2, the positioning protrusion 36 on each arc-shaped clamping plate 6 is inserted into the positioning sliding groove 37 on the wedge-shaped ring 9, so that the wedge-shaped ring 9 can make the arc-shaped clamping plates 6 be distributed in the cable guide sleeve 1 in central symmetry.

[0071] In the process of connecting the cable by using the above-mentioned explosion-proof power cable access device 101 and explosion-proof communication cable access device 102, the positioning protrusions 36 on all the arc-shaped clamping plates 6 are inserted into the corresponding positioning sliding grooves 37 on the wedge-shaped blocks, then the cable guide sleeve 1 and the first pressing plate 4 are inserted into the sealing ring communication pipe 2, and the cable guide sleeve 1 is connected with the sealing ring communication pipe 2 by rotating. In the process of continuously inserting the cable guide sleeve 1 into the sealing ring communication pipe 2, the elastic force of the force storage spring 4.3 acts on the arc-shaped clamping plates 6 through the rear ring plate 4.2 to make the arc-shaped clamping plates 6 displace inward and clamp 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 with the inner wall surface of the front end of the annular mounting groove 18. In the process of the arc-shaped clamping plates 6 displacing inward, under the action of the annular inclined groove 7 and the inclined sliding block 8, the arc-shaped clamping plates 6 do not displace axially and can not displace in the circumferential direction of the cable, so as to prevent the cable surface from being damaged in the process of clamping the cable.

[0072] When the cable guide sleeve 1 is continuously inserted into the sealing ring communication pipe 2, the ball 30 contacts with the front end inner wall surface of the annular sleeve groove 35, then the rear top rod 29 displaces rearward and pushes the stop block 25 outward, when the cable guide sleeve 1 is completely connected with the sealing ring communication pipe 2, the rear end of the stop block 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 body 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] In the process of using the cable, if the cable surface softens or the internal protective layer breaks, causing the hardness of the part clamped by the arc-shaped clamping plates 6 to decrease, at this time, the rear ring plate 4.2 displaces rearward under the action of the force storage spring 4.3 and pushes the arc-shaped clamping plates 6 to move inward. At this time, the arc-shaped clamping plates 6 displace inward along the radial direction 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 body 8.2. In this way, it is ensured that the arc-shaped clamping plates 6 can always maintain stable clamping of the cable following the change of the hardness of the cable surface.

[0074] The above merely provides the preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An explosion-proof switch device for a mining electric vehicle, characterized in that, The utility model provides an explosion -proof cable access device, including cable access cavity (10), electric device cavity (11), baffle (12), first terminal (13) and second terminal (14), the cable access cavity (10) includes explosion -proof power cable access device (101), explosion -proof communication cable access device (102), the electric device cavity (11) includes main switch (103), electromagnetic operation device (104), detection device (105), power device (106), protection device (107), time delay device (108), explosion -proof cable quick -connect device (109), explosion -proof power cable access device (101) and explosion -proof communication cable access device (102) all include cable lead -in cover (1), sealing ring intercommunication pipe (2), sealing pad (3), sealing pad pressing plate and fastening kit, the front end of cable lead -in cover (1) is threadedly connected with the tail end of sealing ring intercommunication pipe (2), sealing pad (3) is arranged in sealing ring intercommunication pipe (2), sealing pad pressing plate includes first pressing plate (4) and second pressing plate (5) of distribution in the front and rear ends of sealing pad (3), and fastening kit includes arc clamping plate (6), annular inclined chute (7), inclined sliding block (8) and contractile ring (9), the inner wall surface of cable lead -in cover (1) is provided with annular inclined chute (7), and the top end of the inner wall surface of the both sides of annular inclined chute (7) is inclined 45 ° forward, inclined sliding block (8) is integrally T-shaped, and the front and rear sides of inclined sliding block (8) are same with the inclined angle of the side wall of annular inclined chute (7), the bottom end of inclined sliding block (8) is connected with the outer surface of arc clamping plate (6), the front end of the outer surface of arc clamping plate (6) is provided with arc guide slope that is inclined 45 ° downward, contractile ring (9) is arranged on the side of first pressing plate (4) towards cable lead -in cover (1), and the rear end of the inner surface of contractile ring (9) is provided with annular guide slope that is adapted with guide slope, first pressing plate (4) includes front ring plate (4.1), rear ring plate (4.2) and force storage spring (4.3), the inner of front ring plate (4.1) is provided with annular expansion slot (15), the front end of rear ring plate (4.2) is inserted into annular expansion slot (15), the front end of rear ring plate (4.2) is provided with annular mounting groove (18), force storage spring (4.3) is located in annular mounting groove (18), and the front end of force storage spring (4.3) is connected with the front end surface of annular expansion slot (15), the rear end of force storage spring (4.3) is connected with the rear end surface of annular mounting groove (18), contractile ring (9) is fixedly installed on the rear end surface of rear ring plate (4.2), the front end of cable lead -in cover (1) is provided with front top ring (19), and the front end surface of front top ring (19) is abutted on the rear end surface of first pressing plate (4.1).

2. The explosion-proof switchgear for mine electric vehicle according to claim 1, characterized in that, Both sides of the annular telescopic slot (15) are provided with annular sliding grooves (16), the front end of the inner and outer sides of the rear ring plate (4.2) is fixedly provided with annular sliding blocks (17), the outer diameter of the gnomon ring (9) and the outer diameter of the rear ring plate (4.2) are adapted to the diameter of the inner wall surface of the outer side of the annular telescopic slot (15), the inner diameter of the front top ring (19) is adapted to the outer diameter of the rear ring plate, the front top ring (19) is sleeved outside the gnomon ring (9), and the front end surface of the cable lead-in sleeve (1) is spaced from the rear end surface of the gnomon ring (9).

3. The explosion-proof switchgear for mine electric vehicle according to claim 2, characterized in that, The inclined sliding block (8) comprises an inner block (8.1) and an outer block (8.2) distributed inside and outside, the bottom of the rear end surface of the outer block (8.2) is provided with a lower extension ring body (8.3), the rear side inner wall surface of the annular inclined slot (7) is an annular surface, and when the cable lead-in sleeve (1) is threadedly connected with the sealing ring communication pipe (2), the rear end surface of the lower extension ring body (8.3) is in contact with the annular surface, the front end inner wall surface of the annular inclined slot (7) is provided with a supporting ring (20), the rear end of the supporting ring (20) is provided with a limiting ring (21), the rear side surface of the supporting ring (20) and the rear end surface of the limiting ring (21) are both provided with the same inclination angle as the inner wall surface of the annular inclined slot (7), and when the lower extension ring body (8.3) is displaced inward on the annular surface, the outer block (8.2) pushes the supporting ring (20) and the limiting ring (21) to displace forward.

4. The explosion-proof switchgear for mine electric vehicle according to claim 3, characterized in that, The front end of the supporting ring (20) is connected with a guide rod (22), the front end of the guide rod (22) is connected with a supporting spring (23), and when the supporting ring (20) and the limiting ring (21) displace forward, the supporting spring (23) is compressed.

5. The explosion-proof switchgear for mine electric vehicle according to claim 4, characterized in that, The outer part of the guide rod (22) is sleeved with an outer top ring (24), the rear end surface of the outer top ring (24) is a conical surface, the inside of the cable lead-in sleeve (1) is provided with a "∥" shaped stop block (25), the inner side surface of the rear end of the stop block (25) is provided with an inclined surface matched with the conical surface, the cable lead-in sleeve (1) is provided with a radial containing groove (26), the stop block (25) is slidingly arranged in the radial containing groove (26), a radial spring (27) is arranged between the stop block (25) and the outer side inner wall surface of the radial containing groove (26), the cable lead-in sleeve (1) is provided with an axial telescopic slot (28), the outer top ring (24) is slidingly arranged in the axial telescopic slot (28), when the outer top ring (24) is located at the front end of the axial telescopic slot (28) and the stop block (25) is located at the innermost side of the radial containing groove (26), the rear end surface of the stop block (25) is in contact with the front end surface of the outer top ring (24), and the front end of the cable lead-in sleeve (1) is provided with a rear top part for controlling the displacement of the stop block (25).

6. The explosion-proof switchgear for mine electric vehicle according to claim 5, characterized in that, The rear top part comprises a rear top rod (29) and a ball (30), the rear end surface of the rear top rod (29) is provided as a tapered surface, the inner side of the front end of the stop block (25) is provided as a slope surface matched with the tapered surface, the ball is embedded in the front end of the rear top rod (29), when the stop block (25) is located at the innermost side of the radial accommodating groove, the ball extends out of the front end of the front top ring (19), when the front end of the front top ring (19) contacts with the rear end surface of the front ring plate (4.1), the ball is located in the front top ring (19), and the stop block (25) is located at the outermost side in the radial accommodating groove.

7. The explosion-proof switchgear for mine electric vehicle according to claim 6, characterized in that, The rear end outer diameter of the rear top rod (29) is larger than the front end outer diameter, and the front end of the front top ring (19) and the cable lead-in sleeve (1) are provided with a displacement groove (31) for axial displacement of the rear top rod (29) together, 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 accommodating groove, and the inner side surface of the rear end of the stop block (25) can enter the displacement groove (31) from the radial accommodating groove.

8. The explosion-proof switchgear for mine electric vehicle according to claim 6, characterized in that, The front end surface of the support ring (20) is provided with an annular wheel groove (32), the tail end of the rear top rod (29) is rotatably provided with a roller (33), and the roller (33) is located in the annular wheel groove (32).

9. The explosion-proof switchgear for mine electric vehicle according to claim 6, characterized in that, The rear end of the sealing ring communication pipe (2) is provided with a threaded groove (34), the front end inner wall surface of the threaded groove (34) is provided with an annular sleeve groove (35) for sleeving outside the front top ring, and the ball (30) contacts the front end surface of the annular sleeve groove (35).

10. The explosion-proof switchgear for mine electric vehicle 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, the front end slope surface of the arc-shaped clamping plate (6) is provided with a positioning protrusion (36), and the slope surface of the wedge-shaped ring (9) is provided with a positioning sliding groove (37) matched with the width of the positioning protrusion (36).

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