Mining flame-proof change-over switch

Abstract

The utility model belongs to the field of mining equipment, and relates to a mining explosion-proof change-over switch, which mainly comprises a branching explosion-proof cavity, a switch explosion-proof cavity and a main line explosion-proof cavity which are connected from top to bottom, and also comprises a wiring device and a fixing device, the explosion-proof cavity is electrically connected with the other two explosion-proof cavities through the first switching device and the second switching device. According to the utility model, a three-cavity separated explosion-proof structure is utilized, the combined switch which easily generates electric sparks during operation is independently isolated in the switch explosion-proof cavity, the safety is improved, circuit wiring and control are carried out on electrical equipment in explosive environments such as a mine through the three-stage combined switch, and when the electrical equipment fails, power supply does not need to be cut off in a power distribution room, so that the cost is reduced. Under the condition that the main line is not influenced, the switch knob can be used for controlling the circuit to cut off the branch line so as to facilitate maintenance; the explosion-proof junction box has the function of connecting the main line and the branch line in parallel, and can replace a common explosion-proof junction box.

Description

Technical Field

[0001] The utility model belongs to the field of mining equipment and relates to a flameproof conversion switch for mining. The flameproof chamber of a switch, a main line flameproof chamber and a branch line flameproof chamber of a flameproof structure are used to connect circuits and control electrical equipment in explosive environments such as underground mines. When electrical equipment fails, a switch knob can be used to control the circuit to cut off the branch line without affecting the main line, so as to facilitate maintenance and repair. Background Art

[0002] In daily life, the junction box is a device for transitioning the joints of wires, which plays the role of protecting and connecting wires. The junction box is divided into two-way junction box and three-way junction box. The two-way junction box is suitable for connecting longer wires; when the circuit encounters a fork, the three-way junction box can be used to connect the extra straight circuit; the three-way junction box can replace the power junction box and can be used for 2-3 circuits.

[0003] In dangerous places where explosions are more likely to occur, such as petrochemicals, coal mines, and dusty environments, in order to ensure safety, flameproof junction boxes must be used for wiring circuits. The flameproof junction box forms a closed space through various components to ensure that even if an explosion occurs inside, it will not cause harm to the external environment. However, electrical equipment in environments such as coal mines is prone to damage, and once damaged, it will cause problems such as inability to operate normally or even danger. Therefore, in such environments, equipment should be maintained and repaired on time to avoid uncontrollable dangers. Various types of flameproof junction boxes in the prior art simply connect the main line and the branch line. In the case of frequent maintenance and repair, the entire main line power supply can only be cut off in the distribution room, which is extremely inconvenient to operate and affects the operation of other equipment.

[0004] In the prior art, Chinese patent CN218514042U discloses a low-voltage explosion-proof junction box for mining, including a box body, a cover body for covering the opening of the box body, the cover body including a fixed plate and a rotating plate, the fixed plate is fixedly mounted on the inner wall of the box body, the rotating plate is rotatably mounted on the fixed plate, the rotating shaft of the rotating plate is the same as the axis of the box body, and the rotating plate is used to control the opening and closing of the box body; a fastener is provided between the fixed plate and the rotating plate, and the rotating plate is fixed to the fixed plate by the fastener. This application reduces the contact area between the opening surface of the box body and the external environment during wiring, thereby effectively reducing the probability of external impurities and dust falling into the box body; but no switch capable of controlling the branch line is provided to facilitate load reduction and equipment maintenance.

[0005] Chinese patent CN218456299U discloses an explosion-proof flameproof junction box, including a base, a rotation groove is provided at the center of the top surface of the base, and the inner cavity of the rotation groove is movably connected with a rotation shaft through a bearing. The utility model can rotate the explosion-proof flameproof junction box through the coordinated use of a protective cover, a telescopic rod, an arc clamp ring, an adjustment spring, a pressure plate, a reset spring, a fixed ring, a positioning hole, a positioning rod, a rotation shaft and a rotation groove, and at the same time, the entry of the cable into the box can be limited, which solves the problem that the existing explosion-proof flameproof junction box cannot be rotated when in use, and when it is wired in a narrow place, it is easy to make the cable unable to be installed, causing the explosion-proof flameproof junction box to be unusable, and the cable entry cannot be limited, so that the cable is prone to large shaking, and the cable connection is unstable, thereby causing the explosion-proof flameproof junction box to be unable to be wired and the wiring is unstable; but no component that can locally control the branch line is provided.

[0006] Chinese patent CN217522688U discloses a novel flameproof junction box structure capable of realizing double cable crimping, comprising a junction box body and a crimping mechanism, characterized in that: the junction box body also comprises a junction box seat and a junction box cover, the junction box seat has a cavity inside and an opening at the upper end; the junction box cover is installed at the upper end opening of the junction box seat by means of a fastener; a wire outlet bucket with a front end opening protrudes from one side of the junction box; the crimping mechanism is fixedly installed inside the cavity of the junction box seat; the crimping mechanism also comprises a terminal bolt, a mounting plate, an upper wire pressing plate, an intermediate wire pressing plate and a lower wire pressing plate; a plurality of terminal sleeves are arranged in the middle of the mounting plate; a cavity is arranged inside the terminal sleeve; the terminal bolt extends from the outside through the terminal sleeve cavity and is installed inside the junction box seat; the upper end of the terminal bolt is sequentially installed close to the upper wire pressing plate, the intermediate wire pressing plate and the lower wire pressing plate from top to bottom.

[0007] The above-mentioned prior arts all have the problem that the branch line cannot be cut off without affecting the main line, and the maintenance and repair are inconvenient. After searching and analyzing by the inventor, the prior art has not disclosed a mine flameproof transfer switch that uses a switch chamber, a main line flameproof chamber and a branch line flameproof chamber of a flameproof structure to connect and control the circuit of electrical equipment in explosive environments such as mines. Therefore, the invention of a mine flameproof transfer switch can improve the shortcomings of the prior art. When the electrical equipment fails or is under maintenance, the switch knob can be used to control the circuit to cut off the branch line without affecting the main line to facilitate maintenance and repair. Utility Model Content

[0008] The purpose of the utility model is to overcome the shortcomings of the prior art. Based on the improvement of the prior art, the utility model is designed to provide a mining flameproof conversion switch that utilizes a flameproof structure cavity and switch components to perform sealed safety circuit wiring and control of electrical equipment in explosive environments such as underground mines, thereby solving the problems of the prior art that the branch line cannot be cut off without affecting the main line, and the inconvenience of maintenance and repair.

[0009] In order to achieve the above-mentioned purpose, the utility model provides a flameproof transfer switch for mining, including a switch body, a wiring device and a fixing device. The switch body is a rectangular cavity connected to the wiring device on the side, and connected to two or more fixing devices on one side for fixing the entire switch in a desired position. The side of the switch body provided with the fixing device is the back side, and the side not provided with the fixing device is the front side. The switch body is divided into a branch line flameproof cavity, a switch flameproof cavity and a main line flameproof cavity from top to bottom. The branch line flameproof cavity, the switch flameproof cavity and the main line flameproof cavity are The two are connected and separated by the switch cavity wall; the wiring device is composed of a main line wiring device 1, a main line wiring device 2, a transfer device 1, a transfer device 2, and a branch line wiring device. The main line wiring device 1 and the main line wiring device 2 are fixedly connected on both sides of the main line flameproof cavity, one left and one right; one end of the transfer device 1 is fixedly connected to the main line flameproof cavity, and the other end is connected to the switch flameproof cavity; one end of the transfer device 2 is fixedly connected to the branch line flameproof cavity, and the other end is connected to the side of the switch flameproof cavity that is not connected to the transfer device 1; the branch line wiring device is fixedly connected to the side that is not connected to the transfer device 2.

[0010] The utility model relates to a main line wiring device 1, a main line wiring device 2 and a branch line wiring device with the same structure, which are all composed of a line entry tube, a cable sealing ring 1, a baffle 1 and a gasket 1. A cable sealing ring 1 is fixed inside the line entry tube, a baffle 1 is fixed outside the cable sealing ring 1, a gasket 1 is arranged at the contact between the baffle 1 and the cable sealing ring 1, and the cable sealing ring 1, the baffle 1 and the gasket 1 together form a flameproof surface.

[0011] The utility model relates to an adapter device 1 and an adapter device 2 with the same structure, which are composed of a cable hose, a switch end connector and a non-switch end connector. The switch end connector and the non-switch end connector are respectively connected by two ends of the cable hose. The cable hose is a metal threading hose. The non-switch connector has the same structure as the main line wiring device 1, the main line wiring device 2 and the branch line wiring device. The switch connector is composed of an incoming wire pipe, a cable sealing ring 2, a washer 2, a clamping nut, a baffle 2 and a washer 3. The inside of the incoming wire pipe is fixed with a cable sealing ring 2 by a clamping nut. The outside of the cable sealing ring 2 is fixed with a baffle 2. A washer 2 is arranged at the contact between the baffle 2 and the cable sealing ring 2. The cable sealing ring 2, the washer 2, the clamping nut and the baffle 2 together form a flameproof surface. The contact between the cable sealing ring 2 and the switch cavity wall is provided with a washer 3 for protecting the internal structure of the switch flameproof cavity.

[0012] The utility model relates to a branch line flameproof chamber, comprising a branch line chamber cover plate, a three-position wiring terminal and a branch line chamber sealing ring. The branch line chamber cover plate is fixed to the switch chamber wall at the upper front end of the switch body by screws that do not come out. The branch line chamber sealing ring is arranged between the branch line chamber cover plate and the switch chamber wall at the connection with the branch line chamber cover plate for sealing. The three-position wiring terminal is transversely arranged inside the branch line flameproof chamber. A branch line wiring device and a second adapter device are respectively connected on the left and right sides of the branch line flameproof chamber. The branch line wiring device and the second adapter device are coaxial. The second adapter device is connected to the right side of the three-position wiring terminal. The branch line chamber cover plate, the branch line chamber sealing ring, the second adapter device, the branch line wiring device and the switch chamber wall form a flameproof structure of the branch line flameproof chamber.

[0013] The switch flameproof chamber involved in the utility model comprises a switch chamber cover plate, a combination switch, a rotating shaft, a circular knob, a knob sealing ring, a switch chamber sealing ring, and a wall-penetrating component. The switch chamber cover plate is fixed on the switch chamber wall on the back of the switch body. The switch chamber sealing ring is arranged between the switch chamber cover plate and the switch chamber wall at the connection with the switch chamber cover plate. A wall-penetrating component is arranged horizontally on both sides of the switch flameproof chamber respectively correspondingly. The left wall-penetrating component is connected to one end of a conversion device one through a cable, and the right wall-penetrating component is connected to one end of a conversion device two through a cable. The two wall-penetrating components, the conversion device one and the conversion device two are on the same axis. The wall-penetrating component is connected to the combination switch through a cable. The combination switch is arranged inside the switch flameproof chamber. The rotating shaft thereof passes through the switch chamber wall and is connected to the circular The knobs are connected, the combination switch, the rotating shaft and the circular knob are coaxial, and a guard ring is arranged around the circular knob to protect the switch. A circular boss protrudes outward from the switch cavity wall at the connection, and the circular boss matches the internal gap of the circular knob, so that the circular knob can be combined with the circular boss more fittingly, and the knob sealing ring is installed on the circular boss; a soft bushing is fixed at the contact point between the root of the rotating shaft of the combination switch and the switch cavity wall through an interference fit, and when the switch shaft rotates and wears and contacts with the explosion-proof surface, causing the explosion-proof surface to fail, the explosion-proof cavity can be re-formed by replacing the soft bushing, which is convenient for maintenance and prolongs the service life; the switch cavity cover plate, the knob sealing ring, the switch cavity sealing ring, the soft bushing, the adapter device 1, the adapter device 2 and the switch cavity wall form the explosion-proof structure of the switch explosion-proof cavity.

[0014] The utility model relates to a through-wall component comprising a three-pin through-wall terminal, an axial end baffle and a blocking nut. The three-pin through-wall terminal passes through the switch cavity walls on both sides of the switch flameproof cavity so that the smaller end enters the inside of the switch flameproof cavity, and a blocking nut is fixed on one side of the inside of the switch flameproof cavity, and an axial end baffle is present between the blocking nut and the switch cavity wall. The three-pin through-wall terminal is limited by the blocking nut and the axial end baffle so that it is not easy to loosen.

[0015] The utility model relates to a main line flameproof chamber comprising a main line chamber cover plate, five-position wiring terminals and a main line chamber sealing ring. The main line chamber cover plate is fixed to the switch chamber wall at the lower front end of the switch body by screws that do not come out. The main line chamber sealing ring is arranged between the main line chamber cover plate and the switch chamber wall at the connection with the main line chamber cover plate. The five-position wiring terminals are transversely arranged inside the main line flameproof chamber. One end of a main line wiring device 1 and a switching device 1 are connected to the left side of the main line flameproof chamber in a through-type manner. A main line wiring device 2 is connected to the right side of the main line flameproof chamber in a through-type manner. The switching device 1 is connected to the left side of the five-position wiring terminal. The main line chamber cover plate, the main line chamber sealing ring, the main line wiring device 1, the main line wiring device 2, the switching device 1 and the switch chamber wall form a flameproof structure of the main line flameproof chamber.

[0016] The fixing device involved in the utility model is composed of a fixing plate, fixing screws, a limiting hole and a fixing hole. The fixing plate is a rounded rectangular metal plate. A fixing hole is arranged at one end of the fixing plate, and a limiting hole is arranged at the other end. A limiting protrusion of suitable size is arranged correspondingly at a place where the fixing device needs to be connected on the switch body. When the limiting protrusion is inserted into the limiting hole of the fixing plate, the fixing plate can be detachably connected. The middle end of the fixing plate is fixedly connected to the switch body by the fixing screw. The limiting hole, the limiting protrusion and the fixing screw can make the fixing plate firmly connected to the switch body, and at the same time, the use of screws is reduced, and the possibility of damaging the explosion-proof structure can be reduced as much as possible under the premise of reducing costs.

[0017] The utility model relates to a main line flameproof cavity in which two inner pressure wire plates are vertically arranged at an access port of a main line wiring device for arranging main line cables.

[0018] The utility model relates to a mining flameproof conversion switch designed with a text printing area, which is arranged on the outside of a branch line cavity cover plate and a main line cavity cover plate and is arranged along the edge of the cover plate for printing texts that need to be explained.

[0019] The mining flameproof conversion switch involved in the utility model is also designed with a switch indication area, which is arranged on the switch cavity wall around the circular knob on the front side of the switch body and is used to mark the switching direction of the switch.

[0020] The switch body of the utility model has four cut corners and is fixedly connected with fixing devices at the four corners of the back side.

[0021] The three-position wiring terminal involved in the utility model is made of DMC material and is installed inside a branch line flameproof cavity in a rear-mounted manner.

[0022] The soft bushing involved in the utility model is a flanging copper bushing.

[0023] Compared with the prior art, the utility model has the following advantages: (1) the entire switch is divided into a main line flameproof chamber, a branch line flameproof chamber and a switch flameproof chamber, and the flameproof structure is separately arranged, so that the combination switch that is easy to generate electric sparks during operation can be separately isolated in the switch flameproof chamber. During maintenance, the flameproof structure provided with the combination switch is not directly destroyed, which is convenient for maintenance and has high safety; (2) the branch line circuit is controlled by a three-level combination switch, which is convenient for power off to repair the circuit or equipment on the circuit, and there is no need to cut off the power supply in the distribution room; (3) it has the function of connecting the main line and the branch line in parallel, and can replace the ordinary explosion-proof junction box; its overall structure is simple, the principle is reliable, the cost is low, the size is small, the functions are diverse, the use efficiency is high, the maintenance is convenient, and the application range is wide. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The utility model is a front view principle diagram of a mine flameproof transfer switch.

[0025] Figure 2 The utility model is a schematic diagram of the transverse section principle of a flameproof transfer switch for mining.

[0026] Figure 3 The utility model is a vertical section principle schematic diagram of a mine flameproof transfer switch.

[0027] Figure 4 The utility model is a schematic diagram of the partial structural principle of the branch line wiring device.

[0028] Figure 5 The utility model is a schematic diagram of the partial structural principle of the inner pressure wire plate.

[0029] The accessories in the attached drawings are marked as: switch body 1, wiring device 2, fixing device 3, branch line flameproof chamber 4, switch flameproof chamber 5, main line flameproof chamber 6, switch chamber wall 7, main line wiring device 1 8, main line wiring device 2 9, adapter 1 10, adapter 2 11, branch line wiring device 12, wire entry pipe 13, cable sealing ring 1 14, baffle 1 15, washer 1 16, cable hose 17, switch end connector 18, non-switch end connector 19, cable sealing ring 2 20, washer 2 21, compression nut 22, baffle 2 23, washer 3 2 4. Branch line cavity cover 25, three-position terminal 26, branch line cavity sealing ring 27, non-slip screw 28, switch cavity cover 29, combination switch 30, rotating shaft 31, round knob 32, knob sealing ring 33, switch cavity sealing ring 34, wall-penetrating component 35, soft bushing 36, three-pin wall-penetrating terminal 37, shaft end baffle 38, blocking nut 39, main line cavity cover 40, five-position terminal 41, main line cavity sealing ring 42, fixing plate 43, fixing screw 44, fixing hole 45, inner wire pressing plate 46, text printing area 47, switch indication area 48. DETAILED DESCRIPTION

[0030] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] Embodiment 1:

[0032] The present embodiment relates to a flameproof transfer switch for use in a mine, comprising a switch body 1, a wiring device 2 and a fixing device 3. The switch body 1 is a rectangular cavity with cut corners connected to the wiring device 2 on the side, and four fixing devices 3 are connected at the four corners of one side, which are used to fix the entire switch in a desired position. The side of the switch body 1 provided with the fixing device 3 is the back side, and the side without the fixing device 3 is the front side. The switch body 1 is divided from top to bottom into a branch line flameproof cavity 4, a switch flameproof cavity 5 and a main line flameproof cavity 6. The branch line flameproof cavity 4, the switch flameproof cavity 5 and the main line flameproof cavity 6 are connected and sealed by a switch cavity wall 7. Separation; the wiring device 2 is composed of a main line wiring device 1 8, a main line wiring device 2 9, a switching device 10, a switching device 2 11, and a branch line wiring device 12. The main line wiring device 1 8 and the main line wiring device 2 9 are fixedly connected on both sides of the main line flameproof chamber 6, one end of the switching device 10 is fixedly connected to the main line flameproof chamber 6, and the other end is connected to the switch flameproof chamber 5. One end of the switching device 2 11 is fixedly connected to the branch line flameproof chamber 4, and the other end is connected to the side of the switch flameproof chamber 5 that is not connected to the switching device 10. The branch line wiring device 12 is fixedly connected to the side that is not connected to the switching device 2 11.

[0033] The main line wiring device 8, the main line wiring device 29 and the branch line wiring device 12 have the same structure, and are all composed of a wire entry tube 13, a cable sealing ring 14, a baffle 15 and a gasket 16. The wire entry tube 13 is a circular tubular shell, and a cable sealing ring 14 is fixed inside. A baffle 15 is fixed outside the cable sealing ring 14. A gasket 16 is arranged at the contact between the baffle 15 and the cable sealing ring 14. The cable sealing ring 14, the baffle 15 and the gasket 16 together constitute a flameproof surface.

[0034] The switching device 10 and the switching device 2 11 have the same structure, and are composed of a cable hose 17, a switch end connector 18 and a non-switch end connector 19. The switch end connector 18 and the non-switch end connector 19 are respectively connected by the two ends of the cable hose 17. The cable hose 17 is a metal threading hose. The non-switch connector has the same structure as the main line wiring device 1 8, the main line wiring device 2 9 and the branch line wiring device 12. The switch connector is composed of an inlet pipe 13, a cable sealing ring 20, a washer 21, and a compression nut 2 2. It is composed of a baffle 23 and a gasket 24. A cable sealing ring 20 is fixed inside the wire entry pipe 13 by a clamping nut 22. A baffle 23 is fixed outside the cable sealing ring 20. A gasket 21 is arranged at the contact between the baffle 23 and the cable sealing ring 20. The cable sealing ring 20, the gasket 21, the clamping nut 22 and the baffle 23 together form a flameproof surface. A gasket 3 24 is arranged at the contact between the cable sealing ring 20 and the switch cavity wall 7 to protect the internal structure of the switch flameproof cavity 5.

[0035] The branch line flameproof chamber 4 includes a branch line chamber cover plate 25, a three-position wiring terminal 26, and a branch line chamber sealing ring 27. The square branch line chamber cover plate 25 is fixed to the switch chamber wall 7 at the upper front end of the switch body 1 by a non-slip screw 28. The branch line chamber sealing ring 27 is arranged between the branch line chamber cover plate 25 and the switch chamber wall 7 at the connection with the branch line chamber cover plate 25 for sealing. The three-position wiring terminal 26 made of DMC material is horizontally arranged inside the branch line flameproof chamber 4 in a rear-mounted manner. The left and right sides of the branch line flameproof chamber 4 are respectively connected with a branch line wiring device 12 and a switching device 11. The branch line wiring device 12 and the switching device 11 are coaxial, and the switching device 11 is connected to the right side of the three-position wiring terminal 26; the branch line chamber cover plate 25, the branch line chamber sealing ring 27, the switching device 11, the branch line wiring device 12 and the switch chamber wall 7 form the flameproof structure of the branch line flameproof chamber 4.

[0036] The switch flameproof chamber 5 comprises a switch chamber cover 29, a combination switch 30, a rotating shaft 31, a circular knob 32, a knob sealing ring 33, a switch chamber sealing ring 34, and a wall-penetrating component 35. The switch chamber cover 29 is fixed on the switch chamber wall 7 on the back of the switch body 1. The switch chamber sealing ring 34 is arranged between the switch chamber cover 29 and the switch chamber wall 7 at the connection with the switch chamber cover 29. A wall-penetrating component 35 is arranged horizontally on both sides of the switch flameproof chamber 5 respectively. The left wall-penetrating component 35 is connected to one end of the conversion device 1 through a cable, and the right wall-penetrating component 35 is connected to one end of the conversion device 2 through a cable. The two wall-penetrating components 35, the conversion device 1 and the conversion device 2 are on the same axis. The wall-penetrating component 35 is connected to the combination switch 30 through a cable. The combination switch 30 is arranged inside the switch flameproof chamber 5, and its rotating shaft 31 passes through the switch chamber wall 7 and is connected to the circular knob 32 on the outside of the switch chamber wall 7. The combination switch 30, the rotating shaft 31 and the circular knob 32 are coaxial, and a guard ring is arranged around the circular knob 32 to protect the switch. A circular boss protrudes outward at the connection of the switch cavity wall 7, and the circular boss matches the internal gap of the circular knob 32, so that the circular knob 32 can be combined with the circular boss more closely, and the knob sealing ring 33 is installed on the circular boss; the root of the rotating shaft 31 of the combination switch 30 and the contact point of the switch cavity wall 7 are detachably fixed with a soft bushing 36 through an interference fit, and the soft bushing 36 is a flanged copper bushing. When the switch shaft rotates and wears and contacts with the flameproof surface, causing the flameproof surface to fail, the flameproof cavity can be re-formed by replacing the soft bushing 36, which is convenient for maintenance and prolongs the service life; the switch cavity cover plate 29, the knob sealing ring 33, the switch cavity sealing ring 34, the soft bushing 36, the adapter 10, the adapter 2 11 and the switch cavity wall 7 form the flameproof structure of the switch flameproof cavity 5.

[0037] The through-wall component 35 includes a three-pin through-wall terminal 37, an axial end baffle 38, and a blocking nut 39. The three-pin through-wall terminal 37 passes through the switch cavity walls 7 on both sides of the switch flameproof cavity 5, so that the smaller end enters the switch flameproof cavity 5, and a blocking nut 39 is fixed on one side of the switch flameproof cavity 5. There is an axial end baffle 38 between the blocking nut 39 and the switch cavity wall 7. The three-pin through-wall terminal 37 is limited by the blocking nut 39 and the axial end baffle 38 to prevent it from loosening.

[0038] The main line flameproof chamber 6 comprises a main line chamber cover plate 40, a five-position wiring terminal 41 and a main line chamber sealing ring 42. The main line chamber cover plate 40 is fixed to the switch chamber wall 7 at the lower front end of the switch body 1 by a non-slip screw 28. The main line chamber sealing ring 42 is arranged between the main line chamber cover plate 40 and the switch chamber wall 7 at the connection with the main line chamber cover plate 40. The five-position wiring terminal 41 is transversely arranged inside the main line flameproof chamber 6. One end of the main line wiring device 1 8 and the adapter 10 are through-connected to the left side of the main line flameproof chamber 6. The main line wiring device 2 9 is through-connected to the right side of the main line flameproof chamber 6. The adapter 10 is connected to the left side of the five-position wiring terminal 41. The main line chamber cover plate 40, the main line chamber sealing ring 42, the main line wiring device 1 8, the main line wiring device 2 9, the adapter 10 and the switch chamber wall 7 form the flameproof structure of the main line flameproof chamber 6.

[0039] The fixing device 3 is composed of a fixing plate 43, a fixing screw 44, a limiting hole and a fixing hole 45. The fixing plate 43 is a rounded rectangular metal plate. A fixing hole 45 is provided at one end of the fixing plate 43, and a limiting hole is provided at the other end. A limiting protrusion of appropriate size is provided corresponding to the place where the fixing device 3 needs to be connected on the switch body 1. When the limiting protrusion is inserted into the limiting hole of the fixing plate 43, the fixing plate 43 can be detachably connected. The middle end of the fixing plate 43 is fixedly connected to the switch body 1 by a fixing screw 44. The limiting hole, the limiting protrusion and the fixing screw 44 can make the fixing plate 43 firmly connected to the switch body 1, while reducing the use of screws, and can reduce the possibility of damaging the explosion-proof structure as much as possible under the premise of reducing costs.

[0040] In the main line explosion-proof chamber 6 involved in this embodiment, two inner pressure wire plates 46 are vertically arranged at the access port of the main line wiring device 8 for arranging the main line cables.

[0041] The explosion-proof transfer switch for mining involved in this embodiment is designed with a text printing area 47, which is arranged on the outside of the branch line cavity cover plate 25 and the main line cavity cover plate 40, and is arranged along the edge of the cover plate, for printing text that needs to be explained, such as: the maximum current is no more than 35A, it is strictly forbidden to open with power on, etc.

[0042] The mining flameproof transfer switch involved in this embodiment is also designed with a switch indication area 48, which is arranged on the switch cavity wall 7 around the circular knob 32 on the front of the switch body 1, and is distributed in a cross shape to mark the switching direction of the switch on a horizontal or vertical line.

[0043] The mine flameproof transfer switch of this embodiment adopts a three-chamber structure of a branch line flameproof chamber 4, a main line flameproof chamber 6 and a switch flameproof chamber 5. The HZ10D-10 / 3 three-pole combination switch 30 is installed in the switch flameproof chamber 5. The rotating shaft 31 passes through the soft bushing 36 and is connected to the circular knob 32 outside the flameproof structure. The combination switch 30 can be driven by rotating the circular knob 32 to connect or disconnect the circuit connected to the combination switch 30 and control the equipment on the circuit. The branch line flameproof chamber 4 is equipped with a TB1-1503-A-130-00A three-position terminal 26, which has three connection positions: A, B, and C. A TB1-3505-A-130-00A five-position terminal block 41 is installed in the main line flameproof chamber 6, with a total of five wiring positions: A, B, C, N, and ground. It can be used as an ordinary explosion-proof junction box for wiring and branching. The three phase lines (A, B, C) are connected to the combination switch 30 through the wiring device 2 and the three-pin through-wall terminal 37. The combination switch 30 is connected to the load end, i.e., the branch line flameproof chamber 4, via the three-pin through-wall terminal 37 and the wiring device 2. The user connects the main line to the five-position terminal block 41 in the main line flameproof chamber 6, and connects the branch line to the three-position terminal block 26 of the branch line flameproof chamber 4 to use the mine flameproof transfer switch.

[0044] When the branch circuit or the equipment on the circuit needs to be repaired, find the mining flameproof conversion switch on the circuit and turn the round knob 32 to close to disconnect the branch circuit without going to the distribution room to cut off the power of the entire circuit; the main line flameproof chamber 6, the branch line flameproof chamber 4 and the switch flameproof chamber 5 are separately provided with flameproof structures, which can isolate the combination switch 30 that is prone to generate electric sparks during operation in the switch flameproof chamber 5 separately, and the flameproof structure provided with the combination switch 30 is not directly destroyed during maintenance, which is convenient for maintenance.

[0045] Embodiment 2:

[0046] This embodiment relates to a method for using a flameproof transfer switch for mining, comprising the following steps:

[0047] (1) Remove the captive screws 28 on the front of the switch body 1 for fixing the main line cavity cover plate 40, open the main line cavity cover plate 40, lead the main line cable from the main line wiring device 1 8, and connect it to the five-position wiring terminal 41 inside the main line flameproof cavity 6, then lead the main line cable out from the main line wiring device 2 9, cover the main line cavity cover plate 40 and screw back the captive screws 28;

[0048] (2) Remove the captive screws 28 on the front of the switch body 1 that are used to fix the branching cavity cover plate 25, open the branching cavity cover plate 25, introduce the branching cable from the branching wiring device 12, and connect it to the three-position wiring terminal 26 inside the branching flameproof cavity 4, cover the branching cavity cover plate 25 and screw back the captive screws 28;

[0049] (3) The entire switch body 1 is fixed at the desired position by means of the fixing hole 45 of the fixing device 3 and the screw;

[0050] (4) Turn the round knob 32 to the position where the combination switch 30 is turned on, the circuit is connected, and the equipment on the circuit can operate;

[0051] (5) When it is necessary to repair the branch line circuit or the equipment on the circuit, the circular knob 32 is turned to the closed position of the combination switch 30 to disconnect the branch line circuit, and the branch line cavity cover 25 is opened to replace the cable or repair the equipment.

Claims

1. A flameproof transfer switch for mining, characterized in that: The utility model comprises a switch body, a wiring device and a fixing device. The switch body is a square cavity with a wiring device connected to the side, and two or more fixing devices are connected to one side for fixing the whole switch in a desired position. The side of the switch body provided with the fixing device is the back side, and the side without the fixing device is the front side. The switch body is divided into a branch line flameproof cavity, a switch flameproof cavity and a main line flameproof cavity from top to bottom. The branch line flameproof cavity, the switch flameproof cavity and the main line flameproof cavity are connected and separated by the switch cavity wall. The wiring device is composed of a main line wiring device 1, a main line wiring device 2, a transfer device 1, a transfer device 2 and a branch line wiring device. The main line wiring device 1 and the main line wiring device 2 are fixedly connected to the two sides of the main line flameproof cavity one on the left and the other on the right. The transfer device 1 is fixedly connected to the main line flameproof cavity at one end, and connected to the switch flameproof cavity at the other end. The transfer device 2 is fixedly connected to the branch line flameproof cavity at one end, and connected to the side of the switch flameproof cavity not connected to the transfer device 1 at the other end. The branch line wiring device is fixedly connected to the side not connected to the transfer device 2.

2. The flameproof transfer switch for mining according to claim 1 is characterized in that: The main line wiring device 1, the main line wiring device 2 and the branch line wiring device have the same structure, and are all composed of an entry tube, a cable sealing ring 1, a baffle 1 and a gasket 1. A cable sealing ring 1 is fixed inside the entry tube, a baffle 1 is fixed outside the cable sealing ring 1, a gasket 1 is arranged at the contact between the baffle 1 and the cable sealing ring 1, and the cable sealing ring 1, the baffle 1 and the gasket 1 together form a flameproof surface; the adapter 1 and the adapter 2 have the same structure, and are composed of a cable hose, a switch end connector and a non-switch end connector. The switch end connector and the non-switch end connector are connected by the two ends of the cable hose. The non-switch connector has the same structure as the main line wiring device 1, the main line wiring device 2 and the branch line wiring device. The switch connector consists of an entry pipe, a cable sealing ring 2, a washer 2, a clamping nut, a baffle 2 and a washer 3. A cable sealing ring 2 is fixed to the inside of the entry pipe by a clamping nut. A baffle 2 is fixed to the outside of the cable sealing ring 2. A washer 2 is arranged at the contact between the baffle 2 and the cable sealing ring 2. The cable sealing ring 2, the washer 2, the clamping nut and the baffle 2 together form a flameproof surface. A washer 3 is arranged at the contact between the cable sealing ring 2 and the switch cavity wall to protect the internal structure of the switch flameproof cavity.

3. The flameproof transfer switch for mining according to claim 1 is characterized in that: The branch line explosion-proof chamber comprises a branch line chamber cover plate, a three-position wiring terminal, and a branch line chamber sealing ring. The branch line chamber cover plate is fixed to the switch chamber wall at the upper front end of the switch body by screws that do not come out. The branch line chamber sealing ring is arranged between the branch line chamber cover plate and the switch chamber wall at the connection with the branch line chamber cover plate. The three-position wiring terminal is transversely arranged inside the branch line explosion-proof chamber. The left and right sides of the branch line explosion-proof chamber are respectively connected with a branch line wiring device and a second adapter device. The branch line wiring device and the second adapter device are coaxial, and the second adapter device is connected to the right side of the three-position wiring terminal. The branch line chamber cover plate, the branch line chamber sealing ring, the second adapter device, the branch line wiring device and the switch chamber wall form the explosion-proof structure of the branch line explosion-proof chamber.

4. The flameproof transfer switch for mining according to claim 1 is characterized in that: The switch flameproof chamber comprises a switch chamber cover, a combination switch, a rotating shaft, a circular knob, a knob sealing ring, a switch chamber sealing ring, and a wall-penetrating component. The switch chamber cover is fixed to the switch chamber wall on the back of the switch body. The switch chamber sealing ring is arranged between the switch chamber cover and the switch chamber wall at the connection with the switch chamber cover. A wall-penetrating component is arranged horizontally on both sides of the switch flameproof chamber respectively correspondingly. The left wall-penetrating component is connected to one end of the conversion device 1 through a cable, and the right wall-penetrating component is connected to one end of the conversion device 2 through a cable. The two wall-penetrating components, the conversion device 1 and the conversion device 2 are on the same axis. The wall-penetrating component is connected to the combination switch through a cable. The combination switch is arranged on the switch. Inside the explosion-proof cavity, its rotating shaft passes through the switch cavity wall and is connected to the circular knob on the outside of the switch cavity wall. The combination switch, rotating shaft and circular knob are coaxial, and a protective ring is arranged around the circular knob to protect the switch. The switch cavity wall protrudes a circular boss outward at the connection, and the circular boss matches the internal gap of the circular knob, so that the circular knob can be combined with the circular boss more fittingly, and the knob sealing ring is installed on the circular boss; a soft bushing is detachably fixed at the contact point between the root of the rotating shaft of the combination switch and the switch cavity wall; the switch cavity cover plate, the knob sealing ring, the switch cavity sealing ring, the soft bushing, the adapter 1, the adapter 2 and the switch cavity wall form the explosion-proof structure of the switch explosion-proof cavity.

5. The flameproof transfer switch for mining according to claim 4 is characterized in that: The through-wall component includes a three-pin through-wall terminal, an axial end baffle, and a blocking nut. The three-pin through-wall terminal passes through the switch cavity walls on both sides of the switch flameproof cavity, so that the smaller end enters the interior of the switch flameproof cavity, and a blocking nut is fixed on one side of the switch flameproof cavity. There is an axial end baffle between the blocking nut and the switch cavity wall, and the three-pin through-wall terminal is limited by the blocking nut and the axial end baffle.

6. The flameproof transfer switch for mining according to claim 1 is characterized in that: The main line explosion-proof chamber comprises a main line chamber cover plate, five-position wiring terminals and a main line chamber sealing ring. The main line chamber cover plate is fixed to the switch chamber wall at the lower front end of the switch body by screws that do not come out. The main line chamber sealing ring is arranged between the main line chamber cover plate and the switch chamber wall at the connection with the main line chamber cover plate. The five-position wiring terminals are arranged horizontally inside the main line explosion-proof chamber. One end of the main line wiring device 1 and the adapter device 1 are connected to the left side of the main line explosion-proof chamber, the main line wiring device 2 is connected to the right side of the main line explosion-proof chamber, and the adapter device 1 is connected to the left side of the five-position wiring terminal. The main line chamber cover plate, the main line chamber sealing ring, the main line wiring device 1, the main line wiring device 2, the adapter device 1 and the switch chamber wall form the explosion-proof structure of the main line explosion-proof chamber.

7. The flameproof transfer switch for mining according to claim 1 is characterized in that: The fixing device is composed of a fixing plate, a fixing screw, a limiting hole and a fixing hole. A fixing hole is set at one end of the fixing plate, and a limiting hole is set at the other end. A limiting protrusion of suitable size is correspondingly set at the place where the fixing device needs to be connected on the switch body. When the limiting protrusion is inserted into the limiting hole of the fixing plate, the fixing plate can be detachably connected. The middle end of the fixing plate is fixedly connected to the switch body by the fixing screw. The fixing plate can be firmly connected to the switch body through the limiting hole, the limiting protrusion and the fixing screw.

8. The flameproof transfer switch for mining according to claim 6 is characterized in that: Two inner pressure wire plates are vertically arranged inside the main line flameproof chamber at an access port of the main line wiring device for arranging the main line cables.

9. The flameproof transfer switch for mining according to claim 1, characterized in that: The front of the switch body is provided with a text printing area for printing texts to be explained.

10. The flameproof transfer switch for mining according to claim 4, characterized in that: A switch indication area is arranged on the front of the switch body. The switch indication area is arranged on the switch cavity wall around the circular knob on the front of the switch body and is used to mark the switching direction of the switch.

Images