Explosion-proof electric cabinet for coal mining machine

Abstract

The invention discloses an explosion-proof electric control box for a coal mining machine, and relates to the field of coal mining equipment, the explosion-proof electric control box comprises a sealing box body and a water cooling machine, the sealing box body is internally provided with a plurality of cavities used for installing electric appliance elements, a shielding plate is arranged between adjacent cavities, and the shielding plate is internally provided with a circulation cavity; a liquid injection pipe and a liquid discharge pipe which are used for communicating the water cooling machine with the circulating cavity are arranged on the sealing box body, a ventilation opening is formed between every two adjacent cavities, a metal net plate is arranged at each ventilation opening, an air blowing cavity is formed in the cavity close to the edge, a fan is arranged at an opening of each air blowing cavity, and an air collecting opening is formed in the cavity far away from the fan; and the air collecting opening is communicated with the air blowing cavity. The overall compactness of the electric cabinet structure is improved, the size of the electric cabinet is reduced, the sealing performance of the electric cabinet is ensured, and the reliability and stability of the coal mining machine are improved.

Description

Technical Field

[0001] The present application relates to the field of coal mining equipment, and in particular to a flameproof electric control box for a coal mining machine. Background Art

[0002] Currently, the electrical components of coal shearers are divided into three types of circuits: main circuit, control circuit, and signal acquisition circuit. In the field of underground coal mining, thin coal seams (less than 1.3 meters thick) present unique challenges and requirements. With the continued exploitation of coal resources, the efficient utilization of thin coal seam reserves is becoming increasingly important. The electrical control boxes of traditional coal shearers are mostly designed for mining in medium-thick coal seams.

[0003] In existing technologies, when mining thin coal seams, the space is limited, which requires the electric control box structure of the coal mining machine to be more compact. The existing conventional electric control sealed box is large in size and difficult to adapt to the limited working space of thin coal seams. At the same time, the mining environment of thin coal seams is relatively harsh, with high dust concentration, high humidity and the presence of flammable and explosive gases such as gas. The protection level of ordinary electric control boxes is difficult to meet the strict requirements of thin coal seam mining. It is easy to cause the electric control system to short-circuit due to dust and water vapor intrusion, component damage and other faults, thereby affecting the reliability and stability of the coal mining machine and increasing equipment maintenance costs.

[0004] To this end, the inventor provides a flameproof electric control box for a coal mining machine. Summary of the Invention

[0005] In order to improve the overall compactness of the electric control box structure, reduce the volume of the electric control box, ensure the sealing of the electric control box, and improve the reliability and stability of the coal mining machine, the present application provides a flameproof electric control box for a coal mining machine.

[0006] The present application provides a flameproof electric control box for a coal mining machine adopts the following technical solution:

[0007] It includes a sealed box body and a water cooler, wherein a plurality of chambers for installing electrical components are provided in the sealed box body, a shielding plate is provided between adjacent chambers, a circulation chamber is provided in the shielding plate, an injection pipe and a discharge pipe for connecting the water cooler and the circulation chamber are provided on the sealed box body, a vent is provided between adjacent chambers, a metal mesh is provided at the vent, an air blowing chamber is provided in the chamber near the edge, a fan is provided at the opening of the air blowing chamber, an air receiving port is provided in the chamber away from the fan, and the air receiving port is communicated with the air blowing chamber.

[0008] By adopting the above technical solution, the sealed box can reduce the ingress of dust and moisture into the sealed box during use, reducing damage to electrical components and improving the reliability and stability of the coal mining machine. The shielding plate and metal mesh plate isolate the electrical components within the chamber, reducing the magnetic field generated by the electrical components from affecting the signal acquisition circuit, reducing electromagnetic interference signals, improving the stability of the electrical control box, and enabling electrical components to be installed closer together, reducing the size of the electrical control box. The use of a fan can accelerate the circulation of gas within the sealed box, and combined with the use of a water cooler to cool the shielding plate, the electrical components within the chamber can function better, improving the reliability and stability of the coal mining machine. The circulation chamber is placed on the shielding plate, achieving both cooling and separation, improving space utilization, increasing the overall compactness of the electrical control box structure, and reducing its size.

[0009] Preferably, a cooling chamber connected to the vent is provided in the shielding plate, and the cooling chamber is arranged along the length direction of the shielding plate. A plurality of blowing ports are provided on the side of the shielding plate away from the vent opening, and the blowing ports are opened along the length direction of the cooling chamber.

[0010] By adopting the above technical solution, the fan makes the air flow in the cooling chamber, and the air flow can be fully cooled through the opened cooling chamber, thereby reducing the temperature of the air flow circulating in the chamber, so that the electrical components can be cooled more quickly, better ensuring the use of the electric control box and improving the reliability and stability of the coal mining machine.

[0011] Preferably, two heat sinks are provided in the cooling chamber, and the heat sinks are arranged along the length direction of the cooling chamber. The heat sinks divide the cooling chamber into an upper flow chamber, a flow chamber and a lower flow chamber. The flow chamber is connected to the vent and opened. The two heat sinks are inclined in the direction away from the vent and away from each other. The heat sink has multiple connecting holes along its length direction, and multiple air outlets are connected to the upper flow chamber or the lower flow chamber.

[0012] By adopting the above technical solution, during operation, after the air flow enters the flow cavity, it is injected into the upper flow cavity and the lower flow cavity through the connecting hole, and then discharged from the air outlet to cool the electrical components. The inclined heat sink can make the air flow blow to the upper and lower sides of the electrical components, thereby better improving the cooling effect of the electrical components and improving the stability of the use of the electrical control box.

[0013] Preferably, the sealed box is further provided with a cable terminal seat, the cable terminal seat is provided with a cable plug-in cavity and a cable wiring cavity, the inner wall of the cable plug-in cavity is provided with a plug-in ring, the outer diameter of the plug-in ring gradually decreases in the direction away from the cable wiring cavity, the inner wall of the cable plug-in cavity is provided with a mounting ring groove, an airbag ring is provided in the mounting ring groove, the airbag ring is used to abut against the cable surface, and the sealed box is provided with an inflatable ball connected to the airbag ring.

[0014] By adopting the above technical solution, when working, the cable is plugged into the cable terminal block, and the plug ring is plugged into the inner wall of the cable, which can limit the cable and better seal the outer wall of the cable. After the cable is installed, the staff presses the inflatable ball to inflate the airbag ring so that the airbag ring abuts against the cable. This not only locks the cable and improves the stability of the cable fixation, but also seals the surrounding side of the cable, reduces dust and moisture from entering the sealed box, reduces damage to electrical components, and improves the reliability and stability of the coal mining machine. In addition, when the cable moves, the airbag fixation can reduce damage to the cable and reduce the gap between the cable and the airbag, better ensuring the sealing of the electric control box.

[0015] Preferably, a wiring terminal is provided on the side wall of the cable wiring cavity, one end of the wiring terminal is inserted into the cavity, and the other end of the wiring terminal is connected to the cable.

[0016] By adopting the above technical solution and using terminal blocks to connect cables and electrical components, dust can be reduced from entering the sealed box, and dust and water vapor can be reduced from entering the sealed box, reducing damage to electrical components and improving the reliability and stability of the coal mining machine.

[0017] Preferably, the drainage pipe and the injection pipe are arranged on the back of the sealed box body, and a protective cover is provided on the back of the sealed box body. The protective cover is provided with an installation cavity for placing the drainage pipe and the injection pipe on the side close to the sealed box body, and a plurality of installation holes are provided on the protective cover.

[0018] By adopting the above technical solution, setting a protective cover and cooperating with the mounting hole, the sealed box can be fixed more conveniently, the stability of the sealed box fixation can be improved, and the impact on the internal sealing of the sealed box can be reduced. In addition, the protective cover can be used to protect the drain pipe and the injection pipe, reducing damage to the drain pipe and the injection pipe, and ensuring the service life of the drain pipe and the injection pipe.

[0019] Preferably, the sealed box body includes a box base and a box cover, the box cover is composed of a first cover plate and a second cover plate, the first cover plate is rotatably connected to the box base, and the second cover plate is rotatably connected to the first cover plate, one of the shielding plates is provided with a plug-in strip, a plug-in groove is formed between the first cover plate and the second cover plate, the plug-in groove is plugged into the plug-in strip, a positioning locking block is provided at the end of the second cover plate away from the first cover plate, and a positioning locking groove is provided on the box base for snap-fitting with the positioning locking block.

[0020] By adopting the above technical solution, the first cover plate and the second cover plate are used in combination to close the box base, so that it can be closed more conveniently in a relatively narrow room, thereby improving the convenience of opening the sealed box body. In combination with the use of the plug-in strip and the plug-in slot, the connection position of the first cover plate and the second cover plate can be locked more conveniently, thereby improving the stability of using the first cover plate and the second cover plate.

[0021] Preferably, a plurality of sealing strips are provided on the side of the first cover plate and the second cover plate close to the box seat, and the sealing strips abut against the box seat for sealing the box cover, a positioning block is provided on the side of the plug-in strip close to the second cover plate, and a guide block is provided on the side of the positioning block away from the plug-in strip, and the guide block is inclined away from the box seat in the direction away from the positioning block, and a positioning groove for plugging with the guide strip is provided on the side of the second cover plate close to the sealing strip.

[0022] By adopting the above technical solution, when the second cover plate rotates, the positioning groove is first inserted into the guide block, and the second cover plate can achieve the purpose of squeezing the sealing strip. When it is rotated into place, the positioning groove slides into the positioning block, so that the second cover plate can be fixed more stably, thereby improving the sealing and stability of the first cover plate and the second cover plate.

[0023] Preferably, a plurality of air guide strips are provided on one side of the first cover plate and the second cover plate close to the box seat. The air guide strips are provided between two adjacent vents and are used to limit the direction of air flow.

[0024] By adopting the above technical solution, when the first and second covers are closed, the air guide strips allow the airflow to circulate better within the cavity, ensuring comprehensive airflow within the cavity, better ensuring comprehensive cooling of the electrical components, and improving the stability of the electronic control cavity. Furthermore, the air guide strips allow the airflow to be better directed toward the electrical components during its flow, ensuring a cooling effect on the electrical components.

[0025] Preferably, the air guide strip is composed of a fixed strip and a sliding strip, the fixed strip is installed on the first cover plate or the second cover plate, a plurality of plug-in slots are provided at intervals on the fixed strip, and a plurality of plug-in sliders that slide in cooperation with the plug-in slots are provided on the side of the sliding strip close to the fixed strip.

[0026] By adopting the above technical solution, when in use, the position of the sliding bar can be adjusted according to the height of the electrical components in each chamber, so that the direction of the airflow can be controlled more conveniently, and when the sliding bar slides, the plug-in slot can open a certain space to allow the airflow to flow, thereby achieving the purpose of restricting the airflow and allowing the airflow to cool the electrical components more comprehensively.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. Using a sealed box can reduce the entry of dust and water vapor into the sealed box, reduce damage to electrical components, and improve the reliability and stability of the coal mining machine. The electrical components in the chamber are isolated by shielding plates and metal mesh plates, reducing the magnetic field generated by the electrical components from affecting the signal acquisition circuit, reducing electromagnetic interference signals, improving the stability of the electrical control box, and allowing the electrical components to be installed closer together, reducing the volume of the electrical control box; using a fan can speed up the gas circulation inside the sealed box, and then using a water cooler to cool the shielding plate can enable the electrical components in the chamber to work better, improving the reliability and stability of the coal mining machine. The circulation chamber is opened on the shielding plate, which satisfies the functions of cooling and separation at the same time, improves the utilization rate of space, improves the overall compactness of the electrical control box structure, and reduces the volume of the electrical control box;

[0029] 2. After the airflow enters the flow cavity, it is injected into the upper and lower flow cavities through the connecting holes and then discharged from the air outlet to cool the electrical components. The tilted heat sink can make the airflow blow to the upper and lower sides of the electrical components, thereby better improving the cooling effect of the electrical components and improving the stability of the electric control box.

[0030] 3. Use the first cover plate and the second cover plate to close the box base, so that it can be closed more conveniently in a narrow room, which improves the convenience of opening the sealed box body. Use the plug-in strip and the plug-in slot together to lock the connection position of the first cover plate and the second cover plate more conveniently, thereby improving the stability of using the first cover plate and the second cover plate. When the second cover plate rotates, the positioning groove is first inserted into the guide block, and the second cover plate can achieve the purpose of squeezing the sealing strip. When it is rotated into place, the positioning groove slides into the positioning block, so that the second cover plate can be fixed more stably, thereby improving the sealing and stability of the first cover plate and the second cover plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1This is a schematic diagram of the overall structure of a flameproof electric control box for a coal mining machine according to an embodiment of the present application;

[0032] Figure 2 for Figure 1 A magnified schematic diagram of part A;

[0033] Figure 3 This is a schematic diagram mainly showing the vent structure of an embodiment of the present application;

[0034] Figure 4 for Figure 3 An enlarged schematic diagram of part B;

[0035] Figure 5 for Figure 3 A magnified schematic diagram of part C;

[0036] Figure 6 This is a schematic diagram of the protective cover structure mainly embodied in the embodiment of the present application.

[0037] Figure 7 This is a schematic diagram of the sliding bar structure mainly embodied in the embodiment of the present application.

[0038] Reference numerals: 1, water-cooling machine; 2, cable connection chamber; 3, box seat; 4, chamber; 5, air receiving port; 6, inflatable ball; 7, cable connection seat; 8, blowing chamber; 9, fan; 10, cable plug-in chamber; 11, vent; 12, shielding plate; 13, plug-in ring; 14, mounting ring groove; 15, terminal; 16, airbag ring; 18, first cover plate; 19, downflow chamber; 20, flow chamber; 21, upflow chamber; 22, sliding bar; 23, plug-in slider; 24 , plug-in slide; 25, second cover; 26, positioning locking groove; 27, positioning locking block; 28, installation cavity; 29, injection pipe; 30, circulation cavity; 31, metal mesh; 32, connecting hole; 33, heat sink; 34, air outlet; 35, plug-in strip; 36, positioning block; 37, positioning groove; 38, guide block; 39, sealing strip; 40, protective cover; 41, installation hole; 42, drain pipe; 43, connecting pipe; 44, plug-in slot; 45, fixing strip. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1 - Figure 7 This application is described in further detail.

[0040] The embodiment of the present application discloses a flameproof electric control box for a coal mining machine.

[0041] Example 1

[0042] Reference Figure 1A flameproof electric control box for a coal mining machine includes a sealed box body and a water cooler 1. The sealed box body is rectangular, and the water cooler 1 is fixed to one side of the sealed box body. A plurality of chambers 4 for installing electrical components are provided in the sealed box body, and the size of the chamber 4 is made according to the size of the electrical components to be installed. A shielding plate 12 is fixed between adjacent chambers 4, and a circulation chamber 30 is provided in the shielding plate 12. The circulation chamber 30 is an annular structure. An injection pipe 29 and a discharge pipe 42 for connecting the water cooler 1 and the circulation chamber 30 are fixed on the sealed box body, so that cold water can be circulated and cooled in the shielding plate 12. A vent 11 is provided between adjacent chambers 4, and the plurality of vents 11 cooperate with the chamber 4 to form a single-direction airflow in the sealed box body. A metal mesh plate 31 is fixed at the opening of the vent 11. A blowing chamber 8 is fixed in the chamber 4 near the edge. A fan 9 is fixed at the opening of the blowing chamber 8. The fan 9 can make the wind flow more smoothly and mobilize the gas flow. A horn-shaped air intake 5 is fixed in the chamber 4 away from the fan 9. The air intake 5 has a trumpet-shaped structure. A connecting pipe 43 is connected between the air intake 5 and the blowing chamber 8. Through the connecting pipe 43, the air flow in the sealed box can circulate more smoothly, thereby better dissipating the heat of the electrical components. The shielding plate 12 cooperates with the circulation chamber 30 to reduce the magnetic field generated by the electrical components from affecting the signal acquisition circuit, reduce electromagnetic interference signals, and reduce the temperature inside the electrical control box. In conjunction with the fan 9, the electrical components in the electrical control box can be cooled more conveniently.

[0043] A cooling chamber connected to the vent 11 is defined within the shielding plate 12. The cooling chamber is rectangular and extends along the length of the shielding plate 12. Multiple air outlets 34 are defined on the side of the shielding plate 12 away from the vent 11. The air outlets 34 extend along the length of the cooling chamber. Two heat sinks 33 are fixed within the cooling chamber and extend along its length. The heat sinks 33 divide the cooling chamber into an upper flow chamber 21, a flow chamber 20, and a lower flow chamber 19. The flow chamber 20 is connected to the vent 11. The two heat sinks 33 are tilted away from each other in a direction away from the vent 11. Multiple connecting holes 32 are defined along the length of the heat sink 33. The connecting holes 32 are waist-shaped holes. The multiple air outlets 34 connect to either the upper flow chamber 21 or the lower flow chamber 19, allowing airflow to be more easily blown to the upper and lower sides of the electrical components, thereby effectively cooling the electrical components.

[0044] A cable terminal block 7 is also fixed inside the sealed box. The cable terminal block has a cable plug-in cavity 10 and a cable wiring cavity 2. A plug-in ring 13 is fixed to the inner wall of the cable wiring cavity 2. The outer diameter of the plug-in ring 13 gradually decreases as it moves away from the cable wiring cavity 2. A mounting ring groove 14 is provided on the inner wall of the cable plug-in cavity 10. An airbag ring 16 is fixed in the mounting ring groove 14. The airbag ring 16 is used to abut against the surface of the cable. An inflatable ball 6 connected to the airbag ring 16 is fixed to the sealed box. By pressing the inflatable ball 6, the staff can inflate the airbag ring 16 with gas, achieving the effect of sealing the cable. When the cable moves, the fixation of the airbag ring 16 can reduce damage to the cable and reduce the gap between the cable and the airbag, thereby better ensuring the sealing of the sealed box. The side wall of the cable connection chamber 2 is fixed with a terminal 15, which is made of copper. One end of the terminal 15 is inserted into the chamber 4, and the other end is connected to the cable, thereby better reducing the entry of dust and water vapor into the sealed box, reducing damage to electrical components, and improving the reliability and stability of the coal mining machine.

[0045] The drain pipe 42 and the injection pipe 29 are mounted on the back of the sealed box. A protective cover 40 is fixed to the back of the sealed box. The side of the protective cover 40, close to the sealed box, defines a mounting cavity 28 for the drain pipe 42 and the injection pipe 29. The protective cover 40 is also provided with a plurality of mounting holes 41. The protective cover 40 protects the drain pipe 42 and the injection pipe 29, and, in combination with the mounting holes 41, provides a more stable fixation on the electrical control box, improving its operational reliability.

[0046] The sealed box body includes a box base 3 and a box cover. The box cover consists of a first cover plate 18 and a second cover plate 25. The first cover plate 18 is rotatably connected to the box base 3, and the second cover plate 25 is rotatably connected to the first cover plate 18. A plug-in strip 35 is fixed to one of the shielding plates 12. A plug-in slot 44 is formed between the first cover plate 18 and the second cover plate 25. The plug-in slot 44 plugs into the plug-in strip 35. A positioning locking block 27 is fixed to the end of the second cover plate 25 away from the first cover plate 18. A positioning locking slot 26 is fixed to the box base 3, which engages with the positioning locking block 27. This makes it easier to secure the box cover.

[0047] A plurality of rubber sealing strips 39 are fixed to the sides of the first and second cover plates 18 and 25 near the housing base 3. These sealing strips 39 abut the housing base 3 to seal the housing cover. A rectangular positioning block 36 is fixed to the side of the plug-in strip 35 near the second cover plate 25. A guide block 38 is integrally formed on the side of the positioning block 36 away from the plug-in strip 35. The guide block 38 is tilted away from the housing base 3, away from the positioning block 36. A positioning slot 37 is defined on the side of the second cover plate 25 near the sealing strip 39, which engages with the guide block 36. The positioning slot 37 is first inserted into the guide block 38, allowing the second cover plate 25 to squeeze the sealing strip 39. Once the positioning slot 37 is rotated into place, it slides into the positioning block 36, thereby securing the second cover plate 25 more stably and improving the sealing and stability between the first and second cover plates 18 and 25.

[0048] A plurality of air guide strips are fixed on the side of the first cover plate 18 and the second cover plate 25 close to the box seat 3. The air guide strips are fixed between two adjacent vents 11. The air guide strips are used to limit the direction of the airflow, so as to better increase the flow area of ​​the airflow in the chamber 4 and better ensure the comprehensiveness of the cooling of the electrical components. The air guide strips are composed of a fixed strip 45 and a sliding strip 22. The fixed strip 45 is installed on the first cover plate 18 or the second cover plate 25. A plurality of plug-in slots 24 are spaced apart on the fixed strip 45. The plug-in slots 24 are opened along the thickness direction of the fixed strip 45. A plurality of plug-in sliders 23 that slide and cooperate with the plug-in slots 24 are fixed on the side of the sliding strip 22 close to the fixed strip 45. According to the height of the electrical components in each chamber 4, the position of the sliding strip 22 can be adjusted, so that the direction of the airflow can be controlled more conveniently. When the sliding strip 22 slides, the plug-in slots 24 can be opened to a certain space for the airflow to flow.

[0049] The implementation principle of the flameproof electric control box for a coal mining machine in the embodiment of the present application is as follows: during installation, it is installed according to the size of the cavity, and after fixing, the first cover plate 18 and the second cover plate 25 are fixed. The use of the shielding plate 12 can separate the electrical components in the two adjacent chambers 4, reduce the magnetic field generated by the electrical components to affect the signal acquisition circuit, reduce electromagnetic interference signals, improve the stability of the use of the electric control box, and also enable the electrical components to be installed closer to each other, reducing the volume of the electric control box. Under the action of the fan 9, the airflow can be circulated in the air, and the circulation cavity 30 in the shielding plate 12 can accelerate the cooling of the air. The inclined heat sink 33 can make the airflow blow to the upper and lower sides of the electrical components, thereby better improving the cooling effect of the electrical components and improving the stability of the use of the electric control box.

[0050] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A flameproof electric control box for a coal mining machine, characterized by: The invention comprises a sealed box body and a water cooling machine (1), wherein a plurality of chambers (4) for installing electrical components are provided in the sealed box body, a shielding plate (12) is provided between adjacent chambers (4), a circulation chamber (30) is provided in the shielding plate (12), an injection pipe (29) and a discharge pipe (42) for connecting the water cooling machine (1) and the circulation chamber (30) are provided on the sealed box body, a vent (11) is provided between adjacent chambers (4), a metal mesh plate (31) is provided at the vent (11), an air blowing chamber (8) is provided in the chamber (4) near the edge, a fan (9) is provided at the opening of the air blowing chamber (8), an air receiving port (5) is provided in the chamber (4) away from the fan (9), and the air receiving port (5) is connected to the air blowing chamber (8).

2. The flameproof electric control box for a coal mining machine according to claim 1, characterized in that: A cooling chamber connected to the vent (11) is provided in the shielding plate (12), and the cooling chamber is arranged along the length direction of the shielding plate (12). A plurality of air blowing ports (34) are provided on a side of the shielding plate (12) away from the opening of the vent (11), and the air blowing ports (34) are provided along the length direction of the cooling chamber.

3. The flameproof electric control box for a coal mining machine according to claim 2, characterized in that: Two heat sinks (33) are provided in the cooling chamber. The heat sinks (33) are provided along the length direction of the cooling chamber. The heat sinks (33) divide the cooling chamber into an upper flow chamber (21), a flow chamber (20) and a lower flow chamber (19). The flow chamber (20) is connected to the vent (11). The two heat sinks (33) are inclined in a direction away from the vent (11) and away from each other. The heat sink (33) is provided with a plurality of connecting holes (32) along its length direction. A plurality of blowing ports (34) are connected to the upper flow chamber (21) or the lower flow chamber (19).

4. The flameproof electric control box for a coal mining machine according to claim 1, characterized in that: The sealed box body is also provided with a cable terminal seat (7), and a cable plug-in cavity (10) and a cable wiring cavity (2) are provided in the cable terminal seat (7). The inner wall of the cable plug-in cavity (10) is provided with a plug-in ring (13), and the outer diameter of the plug-in ring (13) gradually decreases in the direction away from the cable wiring cavity (2). The inner wall of the cable plug-in cavity (10) is provided with a mounting ring groove (14), and an airbag ring (16) is provided in the mounting ring groove (14). The airbag ring (16) is used to abut against the surface of the cable. The sealed box body is provided with an inflatable ball (6) connected to the airbag ring (16).

5. The flameproof electric control box for a coal mining machine according to claim 4, characterized in that: A wiring terminal (15) is provided on the side wall of the cable wiring cavity (2), one end of the wiring terminal (15) is inserted into the cavity (4), and the other end of the wiring terminal (15) is connected to the cable.

6. The flameproof electric control box for a coal mining machine according to claim 1, characterized in that: The liquid discharge pipe (42) and the liquid injection pipe (29) are arranged on the back of the sealed box body. A protective cover (40) is provided on the back of the sealed box body. A mounting cavity (28) for placing the liquid discharge pipe (42) and the liquid injection pipe (29) is provided on a side of the protective cover (40) close to the sealed box body. A plurality of mounting holes (41) are provided on the protective cover (40).

7. The flameproof electric control box for a coal mining machine according to claim 1, characterized in that: The sealed box body includes a box seat (3) and a box cover, and the box cover is composed of a first cover plate (18) and a second cover plate (25), the first cover plate (18) is rotatably connected to the box seat (3), and the second cover plate (25) is rotatably connected to the first cover plate (18), one of the shielding plates (12) is provided with a plug-in strip (35), a plug-in groove (44) is formed between the first cover plate (18) and the second cover plate (25), and the plug-in groove (44) is plugged into the plug-in strip (35), and a positioning locking block (27) is provided at one end of the second cover plate (25) away from the first cover plate (18), and a positioning locking groove (26) is provided on the box seat (3) for engaging with the positioning locking block (27).

8. The flameproof electric control box for a coal mining machine according to claim 7, characterized in that: A plurality of sealing strips (39) are provided on the side of the first cover plate (18) and the second cover plate (25) close to the box seat (3), and the sealing strips (39) are in contact with the box seat (3) for sealing the box cover. A positioning block (36) is provided on the side of the plug-in strip (35) close to the second cover plate (25), and a guide block (38) is provided on the side of the positioning block (36) away from the plug-in strip (35). The guide block (38) is tilted away from the box seat (3) along the direction away from the positioning block (36). A positioning groove (37) for plugging and cooperating with the guide bar is provided on the side of the second cover plate (25) close to the sealing strip (39).

9. The flameproof electric control box for a coal mining machine according to claim 8, characterized in that: A plurality of air guide strips are provided on one side of the first cover plate (18) and the second cover plate (25) close to the box seat (3). The air guide strips are provided between two adjacent vents (11) and are used to limit the direction of air flow.

10. The flameproof electric control box for a coal mining machine according to claim 9, characterized in that: The air guide strip is composed of a fixed strip (45) and a sliding strip (22). The fixed strip (45) is installed on the first cover plate (18) or the second cover plate (25). A plurality of plug-in slots (24) are provided on the fixed strip (45) at intervals. A plurality of plug-in sliders (23) that slide and cooperate with the plug-in slots (24) are provided on one side of the sliding strip (22) close to the fixed strip (45).

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