A coal mine explosion-proof power supply box for safe production

Abstract

This invention relates to the field of mining power supply equipment technology, and more particularly to an explosion-proof power supply box for coal mines used in safe production. It includes a cover and a body that work together. Inside the box, from top to bottom, are arranged a first distribution panel, a second distribution panel, and a piston plate, classifying the electronic components assembled inside the box into safe and hazardous types. The first distribution panel is equipped with safe electronic components, and the second distribution panel is equipped with hazardous electronic components. The first distribution panel has several wiring holes. This invention effectively solves the shortcomings of traditional power supply boxes that only provide passive explosion protection. It facilitates the immersion and isolation of the electronic components inside the box using insulating liquid, preventing the generation of electric arcs or sparks on the electronic components, eliminating the cause of explosions, and improving safety. Simultaneously, the insulating liquid provides heat dissipation for the electronic components, ensuring they always operate at a specified temperature and preventing heat buildup that could lead to an explosion.

Description

Technical Field

[0001] This invention relates to the field of mining power supply equipment technology, and in particular to an explosion-proof power supply box for safe production in coal mines. Background Technology

[0002] In the high-risk industry of coal mining, safety is a constant concern. The mine environment is filled with mixtures of flammable and explosive gases such as methane and coal dust, and even a tiny electrical spark or a hot surface can trigger a catastrophic accident. Therefore, the reliability of the explosion-proof power supply box, which is the core power source for underground monitoring, communication, lighting, and rescue systems, directly affects the safety and stability of the entire production system.

[0003] Currently, explosion-proof technology standards for mining strictly rely on the mature principle of explosion-proof enclosures. This principle requires the power supply enclosure to have sufficient mechanical strength and precision in the gaps between joint surfaces to ensure that in the event of an internal explosion, the robust enclosure can withstand the explosion pressure and cool the flame through the gaps to prevent it from igniting the external environment. However, with the continuous improvement of the intelligence and integration level of underground equipment, the power density and heat generation of electronic components inside the power supply enclosure have increased significantly. Traditional passive explosion-proof structures are clearly unable to cope with the challenges of continuous electric arc risk and internal high temperature accumulation. The industry urgently needs to explore innovative solutions that can more proactively and efficiently manage internal fault energy and operating heat while maintaining existing explosion-proof safety standards. Summary of the Invention

[0004] This invention provides an explosion-proof power supply box for coal mines used in safe production, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] An explosion-proof power supply box for safe production in coal mines includes a cover and a body that cooperate with each other. Inside the box, a first distribution panel, a second distribution panel, and a piston disc are arranged sequentially from top to bottom. The electronic components assembled inside the box are divided into safe and hazardous types. The first distribution panel is equipped with safe electronic components, and the second distribution panel is equipped with hazardous electronic components. The first distribution panel has several wiring holes, and the second distribution panel has several through holes. An insulating liquid is stored between the second distribution panel and the piston disc. The piston disc is vertically movable, and the insulating liquid flows through the through holes on both sides of the second distribution panel. The insulating liquid is used to immerse and isolate the electronic components on the second distribution panel.

[0007] A heat dissipation unit for cooling the insulating liquid is provided at the bottom of the housing.

[0008] Furthermore, the heat dissipation unit includes two flow guide chambers arranged opposite each other on the outer wall of the housing and a pump body installed at the bottom of the housing. The flow guide chambers are horizontal and close to the bottom surface of the second distribution panel from the lower side. Both the input and output ends of the pump body are provided with manifolds, and the manifolds are connected to the corresponding flow guide chambers through a plurality of heat exchange tubes arranged in a row.

[0009] Furthermore, the through holes on the second distribution panel are inclined in the direction corresponding to the flow guiding chamber, and a flow guiding plate is provided at the bottom of the through holes.

[0010] Furthermore, the outer wall of the enclosure is provided with several conduits for cable insertion, and a sealing ring is provided inside the conduit to seal the cable.

[0011] Furthermore, the sealing ring has an expansion cavity coaxially arranged with the conduit, the expansion cavity stores insulating liquid, and the conduit is provided with a secondary pipe communicating with the expansion cavity, and a movable disc is slidably arranged in the secondary pipe.

[0012] Furthermore, the sealing ring is provided with an outer edge and a retaining spring that cooperates with the outer edge at both ends along the axial direction of the conduit. The retaining spring is composed of an elastic retaining body and an elastic pressure plate. The elastic retaining body is installed on the inner wall of the conduit, and the elastic pressure plate is in contact with the outer edge.

[0013] Furthermore, the internal space of the enclosure is cylindrical, and the first distribution panel, the second distribution panel, and the piston disc are all circular;

[0014] Both the bottom of the first distribution panel and the bottom of the second distribution panel are provided with a support ring. Several rotating posts are rotatably arranged on the support ring, and the several rotating posts are arranged in a ring around the axis of the support ring. The rotating posts are connected to the support ring by an elastic body, and the rotating posts are provided with pressure blocks for locking the upper surface of the first distribution panel or the upper surface of the second distribution panel.

[0015] Several notches are provided on the outer circumference of both the first and second distribution panels to cooperate with each of the rotating columns. Teeth are provided on the inner wall of the notches and the outer wall of the rotating columns to cooperate with each other. The support ring is connected to the first or second distribution panel by a bolt.

[0016] Furthermore, the piston disc and the housing are connected by several elastic bodies.

[0017] Furthermore, a transmission ring is rotatably arranged inside the housing, and several adjusting columns are driven on the transmission ring. Each adjusting column is rotatably arranged on the inner wall of the housing along the radial direction of the piston disc. An adjusting arm is provided on the adjusting column, and the adjusting arm is rotatably connected to the piston disc through an adjusting arm.

[0018] Furthermore, the housing is provided with a locking structure for locking the position of the piston disc;

[0019] An adjusting column passes through the housing and extends out. The locking structure includes a polygonal prism, a locking post installed at one end of the polygonal prism, and a locking bracket for locking the locking post. The locking bracket is fixed relative to the housing. The other end of the polygonal prism is slidably inserted into the adjusting column, and an elastic body is provided on the polygonal prism to provide it with an elastic tension in the direction of the housing axis.

[0020] The technical solution of this invention can achieve the following technical effects:

[0021] This design effectively solves the shortcomings of traditional power supply boxes that can only provide passive explosion protection. It allows for the immersion and isolation of electronic components inside the box using insulating liquid, preventing the generation of electric arcs or sparks on these components, eliminating the potential for explosion, and improving safety. At the same time, the insulating liquid also helps dissipate heat from the electronic components, ensuring they always operate at the specified temperature and preventing heat buildup that could lead to an explosion. Furthermore, by dividing the electronic components into different zones within the box, targeted explosion protection can be achieved, improving safety and reducing the amount of insulating liquid used.

[0022] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a structural schematic diagram of an explosion-proof power supply box for safe production in a coal mine.

[0025] Figure 2 for Figure 1 A structural diagram from another perspective;

[0026] Figure 3 This is a cross-sectional view of the box structure;

[0027] Figure 4 This is a cross-sectional view of the conduit.

[0028] Figure 5 for Figure 4 Exploded view of the central sealing ring and two elastic retainers;

[0029] Figure 6 for Figure 3 Schematic diagram of the structure of the secondary distribution panel;

[0030] Figure 7 for Figure 6 A structural diagram from another perspective;

[0031] Figure 8 for Figure 3 Schematic diagram of the piston disc structure;

[0032] Figure 9 for Figure 2 A magnified view of the structure at point A in the middle;

[0033] Attached diagram markings: 100, box lid;

[0034] 200. Enclosure; 201. Distribution panel one; 202. Distribution panel two; 203. Piston disc; 204. Support ring; 205. Rotating column; 206. Pressure block; 207. Elastic body one; 208. Notch; 209. Transmission ring; 210. Adjusting column; 211. Adjusting arm one; 212. Adjusting arm two; 213. Elastic body two; 214. Polyhedral prism; 215. Locking post; 216. Elastic body three; 217. Locking bracket; 218. Bolt;

[0035] 300. Heat dissipation unit; 301. Flow guide chamber; 302. Pump body; 303. Manifold; 304. Heat exchange tube; 305. Flow guide plate;

[0036] 400. Conduit; 401. Sealing ring; 402. Expansion chamber; 403. Secondary pipe; 404. Movable disc; 405. Threaded rod; 406. Lock nut; 407. Outer edge; 408. Elastic clamping body; 409. Elastic pressure plate. Detailed Implementation

[0037] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0039] like Figures 1 to 3 As shown, this application provides an explosion-proof power supply box for safe production in coal mines, including a box cover 100 and a box body 200 used in conjunction with each other. The box body 200 has a distribution panel 201, a distribution panel 202 and a piston plate 203 arranged from top to bottom. The electronic components assembled in the box body 200 are divided into safe and hazardous types. The distribution panel 201 is equipped with safe electronic components and the distribution panel 202 is equipped with hazardous electronic components. The distribution panel 201 has several wire holes and the distribution panel 202 has several through holes. An insulating liquid is stored between the distribution panel 202 and the piston plate 203. The piston plate 203 is vertically movable and the insulating liquid flows through the through holes on the upper and lower sides of the distribution panel 202. The insulating liquid is used to immerse and isolate the electronic components on the distribution panel 202.

[0040] A heat dissipation unit 300 for cooling the insulating liquid is provided at the bottom of the housing 200.

[0041] Specifically, the opening of the enclosure 200 faces upwards, and the cover 100 is installed over the top opening of the enclosure 200. This facilitates the installation of various electronic components based on the arrangement of the internal distribution panel 201, distribution panel 202, and piston plate 203. Alternatively, the opening of the enclosure 200 can be located on its side, with the cover 100 installed over the opening from the side, while the arrangement of the distribution panel 201, distribution panel 202, and piston plate 203 inside the enclosure 200 remains unchanged. The electronic components installed inside the enclosure 200 can be divided into safe and hazardous types according to their potential for danger. Safe electronic components mainly include capacitors, resistors, inductors, and sensors, while hazardous electronic components mainly include relays, contactors, and batteries. For ease of management and effective explosion protection, [further details are needed]. Safety electronic components and hazardous electronic components are classified and installed in different areas inside the enclosure 200. Distribution panel 1 201, distribution panel 202, and piston plate 203 are arranged vertically inside the enclosure 200, dividing the internal space of the enclosure 200 into multiple chambers. Distribution panel 1 201 and its upper chamber are used to install safety electronic components, while distribution panel 202 and its upper chamber are used to install hazardous electronic components. In this way, when the enclosure cover 100 is opened, distribution panel 1 201 can still provide a safe isolation effect for hazardous electronic components, reducing their contact with the outside air and improving safety. Electronic components between distribution panel 1 201 and distribution panel 202 can be connected to each other through the wiring holes on distribution panel 1 201, and rubber rings can be installed in the wiring holes to achieve sealing of the wiring holes.

[0042] The space between the piston disc 203 and the second distribution panel 202 is used to store insulating liquid. The insulating liquid can be at least one of mineral oil, silicone oil, or fluorinated liquid. Utilizing the vertically movable arrangement of the piston disc 203, the insulating liquid on the piston disc 203 can be squeezed into the upper side of the second distribution panel 202 through the through hole, allowing the insulating liquid to immerse and isolate the hazardous electronic components on the second distribution panel 202, preventing the generation of electric arcs and sparks on the electronic components. The high temperature of the electronic components can also be transferred to the insulating liquid, and then the heat dissipation unit 300 can dissipate heat from the insulating liquid, thereby achieving heat dissipation for the electronic components. This method avoids air circulation on both the inside and outside of the enclosure 200, allowing the high temperature inside the enclosure 200 to be directly transferred to the outside of the enclosure 200 through the insulating liquid and the heat dissipation unit 300, thus achieving the function of isolation and heat dissipation.

[0043] In some embodiments, the space between the piston disk 203 and the second distribution disk 202 can be increased to store more insulating liquid. When the piston disk 203 moves upward, the insulating liquid can flow above the first distribution disk 201, thereby facilitating the immersion and isolation of all electronic components on the first distribution disk 201 and the second distribution disk 202. When only the electronic components on the second distribution disk 202 are immersed and isolated, since the electronic components occupy a large space on the second distribution disk 202, the amount of insulating liquid used will not be too much, and its impact on the weight of the overall structure is small.

[0044] Since the piston disc 203 can move up and down, when it is necessary to repair the internal structure of the housing 200, the piston disc 203 can be moved down and all the insulating liquid can flow into the space between the piston disc 203 and the second distribution panel 202, so that the electronic components on the second distribution panel 202 are exposed. When the piston disc 203 moves, the space under it will change. Therefore, in order to avoid pressure imbalance causing difficulty in moving the piston disc 203, several air holes communicating with the space under the piston disc 203 can be opened at the bottom of the housing 200.

[0045] The technical solution of this invention effectively solves the drawback of traditional power supply boxes that can only provide passive explosion protection. It facilitates the immersion and isolation of electronic components inside the box 200 using insulating liquid, preventing the generation of electric arcs or sparks on the electronic components, eliminating the cause of explosion, and improving safety. At the same time, the insulating liquid is used to dissipate heat from the electronic components, ensuring that they always operate at the specified temperature and avoiding heat buildup that could lead to an explosion. By dividing the electronic components inside the box 200 into different areas, targeted explosion protection can be achieved, improving safety and reducing the amount of insulating liquid used.

[0046] Furthermore, such as Figure 2 and Figure 3 As shown, the heat dissipation unit 300 includes two flow guide chambers 301 arranged opposite each other on the outer wall of the housing 200 and a pump body 302 installed at the bottom of the housing 200. The flow guide chambers 301 are horizontal and close to the bottom surface of the distribution panel 202 from the lower side. Both the input and output ends of the pump body 302 are provided with manifolds 303. The manifolds 303 are connected to the corresponding flow guide chambers 301 through a plurality of heat exchange tubes 304 arranged in a row.

[0047] Since the piston disc 203 is vertically movable, in order to ensure that the insulating liquid can always cooperate with the two guide chambers 301, the guide chambers 301 need to be installed near the bottom surface of the distribution panel 202. In this way, when the piston disc 203 moves to the highest or lowest point of its stroke, the guide chambers 301 can always communicate with the upper space of the piston disc 203. Utilizing the shape characteristics and arrangement of the guide chambers 301, the insulating liquid can be discharged and diffused into the housing 200 in a large area in the horizontal direction from one guide chamber 301, and the insulating liquid can enter the other guide chamber 301 in a large area, which facilitates the circulation of the insulating liquid in the housing 200. The pump body 302 can pressurize and transport the insulating liquid, so that the insulating liquid in the housing 200 flows out of the housing 200 and flows back into the housing 200 through the guide chambers 301, the manifold 303, and the heat exchange pipes 304. The arrangement of several heat exchange pipes 304 can facilitate heat exchange between the insulating liquid and the outside air.

[0048] Furthermore, the through holes on the second distribution panel 202 are inclined toward the corresponding flow guide chamber 301, and a flow guide plate 305 is provided at the bottom of the through holes.

[0049] like Figure 7 As shown, to accommodate the placement of the two flow chambers 301, several through holes can be divided into two groups. Each group of through holes is inclined toward the corresponding flow chamber 301, and the flow guide plate 305 on each group of through holes is also inclined toward the corresponding flow chamber 301. Since the flow chambers 301 are located below the distribution panel 202, when an insulating liquid is discharged into the housing 200 by one flow chamber 301, some of the insulating liquid will be guided to the upper side of the distribution panel 202 through the flow guide plate 305 and the through holes, while the remaining insulating liquid will flow at the bottom of the distribution panel 202. This allows the insulating liquid on both the upper and lower sides of the distribution panel 202 to achieve a circulating flow effect.

[0050] Furthermore, such as Figure 4 As shown, the outer wall of the enclosure 200 is provided with several conduits 400 for cable insertion, and a sealing ring 401 is provided inside the conduit 400 to seal the cable.

[0051] The end of the external cable can be inserted into the enclosure 200 through the conduit 400, thereby setting the connection position between the cable and the electronic components inside the enclosure 200 inside the enclosure 200. With the sealing ring 401 sealing the gap between the conduit 400 and the cable, external air is prevented from entering the enclosure 200, and the electric arc generated at the connection position is prevented from igniting flammable gases such as methane in the air.

[0052] Furthermore, the sealing ring 401 has an expansion cavity 402 coaxially arranged with the conduit 400. The expansion cavity 402 stores insulating liquid. The conduit 400 is provided with a secondary pipe 403 communicating with the expansion cavity 402. A movable disc 404 is slidably arranged in the secondary pipe 403.

[0053] like Figure 4 As shown, the expansion cavity 402 is annular in shape, and its cross-section is flat along the axial direction of the conduit 400. This allows for a larger contact area between the sealing ring 401 and the cable. Insulating liquid is stored in both the internal space of the secondary pipe 403 between the movable disc 404 and the sealing ring 401, and in the expansion cavity 402. When the movable disc 404 moves within the secondary pipe 403 towards the conduit 400, it forces the insulating liquid from the secondary pipe 403 into the expansion cavity 402, causing the expansion cavity 402 to deform and fit tightly against the cable within the conduit 400, thus improving the sealing effect. When the movable disc 404 moves away from the conduit 400, some of the insulating liquid in the expansion cavity 402 enters the secondary pipe 403. At this time, due to the pressure difference, the internal space of the expansion cavity 402 decreases, and the inner diameter of the sealing ring 401 increases, facilitating cable insertion.

[0054] In some embodiments, a threaded rod 405 may be provided on the movable disk 404, and the threaded rod 405 is threadedly connected to the end of the secondary tube 403 away from the conduit 400. The threaded rod 405 and the secondary tube 403 are locked together by a lock nut 406, thereby driving the movable disk 404 to move by rotating the threaded rod 405, and locking the position of the movable disk 404 by using the lock nut 406.

[0055] Furthermore, such as Figure 5 As shown, the sealing ring 401 is provided with an outer edge 407 and a retaining ring that cooperates with the outer edge 407 at both ends along the axial direction of the conduit 400. The retaining ring is composed of an elastic retaining body 408 and an elastic pressure plate 409. The elastic retaining body 408 is installed on the inner wall of the conduit 400, and the elastic pressure plate 409 is in contact with the outer edge 407.

[0056] The elastic clip 408 is installed on the inner wall of the conduit 400 and is pressed against the outer edge 407 by the elastic pressure plate 409, thereby fixing the sealing ring 401. Specifically, two slots are opened on the inner wall of the conduit 400, and the two slots are used in conjunction with the two elastic clips 408 respectively. The outer wall of the elastic pressure plate 409 is in contact with the inner wall of the outer edge 407. By utilizing the elasticity of the elastic clip 408 and the elastic pressure plate 409, the outer edge 407 is pressed against the inner wall of the conduit 400, thereby achieving rapid fixing of the sealing ring 401.

[0057] Furthermore, the internal space of the enclosure 200 is cylindrical, and the distribution panel 1 201, distribution panel 202 and piston plate 203 are all circular;

[0058] Both the bottom of distribution panel 1 201 and the bottom of distribution panel 202 are provided with a support ring 204. Several rotating posts 205 are rotatably arranged on the support ring 204, and the rotating posts 205 are arranged in a ring around the axis of the support ring 204. The rotating posts 205 and the support ring 204 are connected by an elastic body 207. The rotating posts 205 are provided with a pressure block 206 for locking the upper surface of distribution panel 1 201 or the upper surface of distribution panel 202.

[0059] Several notches 208 are provided on the outer circumference of distribution panel 1 201 and distribution panel 202 to cooperate with each rotating column 205. Teeth are provided on the inner wall of the notch 208 and the outer wall of the rotating column 205. The support ring 204 is connected to distribution panel 1 201 or distribution panel 202 by a plug 218.

[0060] like Figure 3 and Figure 6 As shown, the support ring 204 can support the corresponding distribution panel 1 201 or distribution panel 202. The support ring 204 is fixed to the inner wall of the enclosure 200 by welding, bolt connection, etc. The rotating column 205 provides assembly space. In its natural state, the elastic body 1 207 provides elastic force to the rotating column 205, causing the rotating column 205 to rotate. The rotating column 205 drives the pressure block 206 on it to rotate to a position close to the inner wall of the enclosure 200. At this time, the pressure block 206 is in the retracted state. When it is necessary to assemble distribution panel 1 201 or distribution panel 202, distribution panel 1 201 or distribution panel 202 is placed on the corresponding support ring 204. The pressure block 206 and the rotating column 205 are connected by the notch 2. 08 smoothly passes through distribution panel 1 201 or distribution panel 202. When the bottom of distribution panel 1 201 or distribution panel 202 contacts the upper surface of the support ring 204, the teeth in the notch 208 mesh with the teeth on the outer wall of the rotating column 205, rotating distribution panel 1 201 or distribution panel 202, thereby driving the rotating column 205 to rotate. The rotating column 205 will drive the pressure block 206 to rotate to the upper surface of distribution panel 1 201 or distribution panel 202. At this time, the bottom of the pressure block 206 contacts the upper surface of distribution panel 1 201 or distribution panel 202, thereby restricting the upward movement of distribution panel 1 201 or distribution panel 202, and realizing the locking operation of distribution panel 1 201 or distribution panel 202.

[0061] In the locked state, since the elastic body 207 is in an elastic deformation state, and the distribution panel 201 and the distribution panel 202 can still rotate in the circumferential direction of the support ring 204, sockets can be provided on the support ring 204, the distribution panel 201 and the distribution panel 202. By inserting the plug 218 into the corresponding socket, the position of the support ring 204 and the distribution panel 201, and the support ring 204 and the distribution panel 202 in the circumferential direction of the support ring 204 can be locked. Thus, the quick assembly of the distribution panel 201 or the distribution panel 202 can be achieved. The operation is simple and the connection strength is high.

[0062] Furthermore, the piston disc 203 and the housing 200 are connected by several elastic bodies 213. The elastic bodies 213 provide elastic force to the piston disc 203. When the elastic bodies 213 are located above the piston disc 203, they provide elastic tension; when they are located below the piston disc 203, they provide elastic thrust. Figure 8 For example, the second elastic body 213 provides elastic thrust to the piston disc 203, and the bottom of the second elastic body 213 is connected to the housing 200. In its natural state, the second elastic body 213 pushes the piston disc 203 upward to the designated position. At this time, the insulating liquid flows into the space above the second distribution panel 202. When the electronic components on the second distribution panel 202 still explode in this state, they will provide squeezing force to the insulating liquid. The insulating liquid will transfer this force to the piston disc 203 and the second elastic body 213, thereby causing the piston disc 203 to move downward and the second elastic body 213 to undergo elastic deformation. This method can provide space for the explosion and facilitate the buffering of the explosion, reduce its impact on the housing 200, and improve the explosion-proof effect.

[0063] Furthermore, such as Figure 8 As shown, a transmission ring 209 is rotatably installed inside the housing 200. Several adjusting columns 210 are driven on the transmission ring 209. Each adjusting column 210 is rotatably installed on the inner wall of the housing 200 along the radial direction of the piston disc 203. An adjusting arm 211 is provided on the adjusting column 210. The adjusting arm 211 is rotatably connected to the piston disc 203 through an adjusting arm 212.

[0064] During initial assembly or when maintenance is required on the internal structure of the housing 200, it is necessary to control the piston disc 203 to move downwards, allowing insulating liquid to flow between the piston disc 203 and the second distribution panel 202. To achieve the adjustment function of the piston disc 203 position, several adjusting columns 210 can be rotated to drive the first adjusting arm 211 to rotate, which in turn drives the second adjusting arm 212 to rotate. The angle of the V-shape formed by the first adjusting arm 211 and the second adjusting arm 212 decreases, thereby pulling the piston disc 203 downwards. The transmission ring 209 ensures that the several adjusting columns 210 rotate synchronously. Because the rotation axis of the second adjusting arm 212 and the piston disc 203 restricts the piston disc 203, the piston disc 203 cannot rotate on its own axis and can only move back and forth in the vertical direction, thereby guiding and restricting the movement direction of the piston disc 203.

[0065] Furthermore, such as Figure 9 As shown, the housing 200 is provided with a locking structure for locking the position of the piston disc 203;

[0066] An adjusting column 210 passes through the housing 200 and extends outwards. The locking structure includes a polygonal prism 214, a locking column 215 installed at one end of the polygonal prism 214, and a locking bracket 217 for locking the locking column 215. The locking bracket 217 is fixed relative to the housing 200. The other end of the polygonal prism 214 is slidably inserted into the adjusting column 210. An elastic body 216 is provided on the polygonal prism 214 to provide it with an elastic tension in the direction of the axis of the housing 200.

[0067] As the piston disc 203 moves downward, the elastic body 213 compresses and provides elastic force to the piston disc 203. Therefore, a locking structure is needed to lock the piston disc 203 when it moves to a specified position, preventing workers from holding or controlling the piston disc 203 to remain stationary in a specific position for an extended period. To achieve this, the locking bracket 217 can lock the locking pin 215, preventing the adjusting pin 210 from rotating. At this time, all adjusting pins 210 and the transmission ring 209 are stationary. When it is necessary to release the piston disc 203, the locking pin 215 is pulled. 5. Move away from the housing 200. At this time, the polygonal prism 214 slides on the adjusting column 210, and the elastic body 216 undergoes elastic deformation. When the locking column 215 moves out of the bracket 217, the bracket 217 no longer restricts the locking column 215, and the elastic body 213 can push the piston disc 203 to move upward to the specified position. During the upward movement of the piston disc 203, the adjusting column 210, the polygonal prism 214 and the locking column 215 all rotate, and the locking column 215 deviates from the bracket 217. The elastic body 216 provides elastic tension for the polygonal prism 214 and the locking column 215.

[0068] Although this application has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made thereto without departing from the spirit and scope of this application. Accordingly, this specification and drawings are merely exemplary illustrations of the application as defined herein, and are to be considered as covering any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from its scope. Thus, if such modifications and modifications fall within the scope of this application and its equivalents, this application intends to include such modifications and modifications.

Claims

1. A coal mine explosion-proof power supply box for safe production, characterized in that, The device includes a cover and a housing that work together. Inside the housing, from top to bottom, are arranged a first distribution panel, a second distribution panel, and a piston disc. The electronic components assembled inside the housing are divided into safe and hazardous types. The first distribution panel is equipped with safe electronic components, and the second distribution panel is equipped with hazardous electronic components. The first distribution panel has several wire holes, and the second distribution panel has several through holes. An insulating liquid is stored between the second distribution panel and the piston disc. The piston disc is vertically movable, and the insulating liquid flows through the through holes on the upper and lower sides of the second distribution panel. The insulating liquid is used to immerse and isolate the electronic components on the second distribution panel. A heat dissipation unit for cooling the insulating liquid is provided at the bottom of the housing. The piston disc is connected to the housing by a plurality of elastic bodies. A transmission ring is rotatably mounted inside the housing, and several adjusting columns are driven on the transmission ring. Each adjusting column is rotatably mounted on the inner wall of the housing along the radial direction of the piston disc. Each adjusting column is equipped with an adjusting arm, and the adjusting arm is rotatably connected to the piston disc through an adjusting arm.

2. The explosion-proof power supply box for safe production in coal mines according to claim 1, characterized in that, The heat dissipation unit includes two flow guide chambers arranged opposite each other on the outer wall of the housing and a pump body installed at the bottom of the housing. The flow guide chambers are horizontal and close to the bottom surface of the second distribution panel from the lower side. Both the input and output ends of the pump body are provided with manifolds, and the manifolds are connected to the corresponding flow guide chambers through a plurality of heat exchange tubes arranged in a row.

3. The explosion-proof power supply box for safe production in coal mines according to claim 2, characterized in that, The through holes on the second distribution panel are inclined in the direction corresponding to the flow guiding chamber, and a flow guiding plate is provided at the bottom of the through holes.

4. The explosion-proof power supply box for safe production in coal mines according to claim 1, characterized in that, The outer wall of the enclosure is provided with several conduits for cable insertion, and a sealing ring is provided inside the conduit to seal the cable.

5. A coal mine explosion-proof power supply box for safe production according to claim 4, characterized in that, The sealing ring has an expansion cavity coaxially arranged with the conduit, and the expansion cavity stores insulating liquid. The conduit is provided with a secondary pipe communicating with the expansion cavity, and a movable disc is slidably arranged inside the secondary pipe.

6. The explosion-proof power supply box for safe production in coal mines according to claim 5, characterized in that, The sealing ring has an outer edge and a retaining spring that cooperates with the outer edge at both ends along the axial direction of the conduit. The retaining spring consists of an elastic retaining body and an elastic pressure plate. The elastic retaining body is installed on the inner wall of the conduit, and the elastic pressure plate is in contact with the outer edge.

7. The explosion-proof power supply box for safe production in coal mines according to claim 1, characterized in that, The internal space of the enclosure is cylindrical, and the first distribution panel, the second distribution panel, and the piston disc are all circular. Both the bottom of the first distribution panel and the bottom of the second distribution panel are provided with a support ring. Several rotating posts are rotatably arranged on the support ring, and the several rotating posts are arranged in a ring around the axis of the support ring. The rotating posts are connected to the support ring by an elastic body, and the rotating posts are provided with pressure blocks for locking the upper surface of the first distribution panel or the upper surface of the second distribution panel. Several notches are provided on the outer circumference of both the first and second distribution panels to cooperate with each of the rotating columns. Teeth are provided on the inner wall of the notches and the outer wall of the rotating columns to cooperate with each other. The support ring is connected to the first or second distribution panel by a bolt.

8. The explosion-proof power supply box for safe production in coal mines according to claim 1, characterized in that, The housing is provided with a locking structure for locking the position of the piston disc; An adjusting column passes through the housing and extends out. The locking structure includes a polygonal prism, a locking post installed at one end of the polygonal prism, and a locking bracket for locking the locking post. The locking bracket is fixed relative to the housing. The other end of the polygonal prism is slidably inserted into the adjusting column, and an elastic body is provided on the polygonal prism to provide it with an elastic tension in the direction of the housing axis.

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