Explosion-proof electric control box for coal mining machine

Abstract

The application discloses a flameproof electric control box for a coal mining machine, and relates to the field of coal mine equipment.The flameproof electric control box comprises a sealed box body and a water cooling machine.A plurality of cavities for mounting electrical elements are formed in the sealed box body.Shielding plates are arranged between adjacent cavities.Circulation cavities are formed in the shielding plates.Liquid injection pipes and liquid discharge pipes for connecting the water cooling machine and the circulation cavities are arranged on the sealed box body.Ventilation openings are formed between adjacent cavities.Metal mesh plates are arranged at the ventilation openings.Gas blowing cavities are arranged in cavities close to edges.Fans are arranged at the openings of the gas blowing cavities.Wind collecting openings are arranged in cavities away from the fans and are connected with the gas blowing cavities.The application improves the compactness of the overall structure of the electric control box, reduces the volume of the electric control box, ensures the sealing property of the electric control box, and improves the reliability and stability of the coal mining machine.

Description

Technical Field

[0001] This application relates to the field of coal mining equipment, and in particular to an explosion-proof electrical control box for a coal mining machine. Background Technology

[0002] Currently, the electrical components of coal mining machines are divided into three types of electrical circuits: main circuit, control circuit, and signal acquisition circuit. In the coal mining industry, mining thin coal seams with a thickness of less than 1.3m underground presents unique challenges and requirements. With the continuous exploitation of coal resources, the efficient utilization of thin coal seam reserves is becoming increasingly important. Traditional coal mining machine control boxes are mostly designed for medium-thick coal seam mining conditions.

[0003] In existing technologies, the limited space required for thin coal seam mining necessitates a compact design for the coal mining machine's electrical control box. Current conventional sealed electrical control boxes are bulky and ill-suited to the confined working space of thin coal seams. Furthermore, the mining environment in thin coal seams is harsh, with high dust concentrations, high humidity, and the presence of flammable and explosive gases such as methane. The protection level of ordinary electrical control boxes is insufficient to meet the stringent requirements of thin coal seam mining, making the electrical control system prone to short circuits and component damage due to dust and moisture intrusion. This, in turn, affects the reliability and stability of the coal mining machine, increasing equipment maintenance costs.

[0004] To address this, the inventor provides an explosion-proof electrical control box for coal mining machines. Summary of the Invention

[0005] In order to improve the overall compactness of the electrical control box structure, reduce the size of the electrical control box, ensure the sealing of the electrical control box, and improve the reliability and stability of the coal mining machine, this application provides an explosion-proof electrical control box for a coal mining machine.

[0006] The explosion-proof electrical control box for a coal mining machine provided in this application adopts the following technical solution:

[0007] The device includes a sealed housing and a water chiller. The sealed housing has multiple chambers for installing electrical components. A shielding plate is provided between adjacent chambers. A circulation chamber is provided within the shielding plate. The sealed housing is provided with a liquid injection pipe and a liquid discharge pipe for connecting the water chiller and the circulation chamber. A ventilation opening is provided between adjacent chambers. A metal mesh plate is provided at the ventilation opening. 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. The air receiving port is connected to the air blowing chamber.

[0008] By adopting the above technical solutions, the sealed enclosure reduces the entry of dust and moisture into the enclosure, minimizing 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 impact of magnetic fields generated by these components on the signal acquisition circuit, minimizing electromagnetic interference, and improving the stability of the control box. This also allows for closer installation of electrical components, reducing the size of the control box. Using a fan accelerates gas circulation within the sealed enclosure, and combined with a water chiller to cool the shielding plate, this allows the electrical components within the chamber to operate more effectively, further enhancing the reliability and stability of the coal mining machine. By placing the circulation chamber on the shielding plate, both cooling and isolation functions are achieved, improving space utilization, increasing the overall compactness of the control box structure, and reducing its size.

[0009] Preferably, the shielding plate has a cooling cavity connected to the ventilation opening, the cooling cavity is arranged along the length of the shielding plate, and multiple air blowing ports are opened on the side of the shielding plate away from the ventilation opening, the air blowing ports are opened along the length of the cooling cavity.

[0010] By adopting the above technical solution, the fan causes the airflow to flow within the cooling chamber. The cooling chamber allows the airflow to be cooled sufficiently, reducing the temperature of the airflow circulating within the chamber. This enables electrical components to cool down more quickly, better ensuring the operation of the electrical control box and improving the reliability and stability of the coal mining machine.

[0011] Preferably, the cooling cavity is provided with two heat sinks, which are arranged along the length of the cooling cavity. The heat sinks divide the cooling cavity into an upper flow cavity, a flowing cavity, and a lower flow cavity. The flowing cavity is connected to the vent. The two heat sinks are inclined in a direction away from the vent and move away from each other. The heat sinks have multiple connecting holes along their length, and the multiple air outlets are connected to the upper flow cavity or the lower flow cavity.

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

[0013] Preferably, the sealed housing is further provided with a cable terminal block, which has a cable insertion cavity and a cable connection cavity. The inner wall of the cable insertion cavity is provided with a insertion ring, the outer diameter of which gradually decreases away from the cable connection cavity. The inner wall of the cable insertion cavity is provided with a mounting ring groove, and an airbag ring is provided in the mounting ring groove. The airbag ring is used to abut against the surface of the cable. The sealed housing is provided with an inflatable ball connected to the airbag ring.

[0014] By adopting the above technical solution, during operation, the cable is plugged into the cable terminal block, with the plug ring inserted into the inner wall of the cable. This limits the cable's movement and improves the sealing of the cable's outer wall. After the cable is installed, the operator inflates the air bladder ring by pressing the inflation ball, causing the air bladder ring to abut against the cable. This not only locks the cable in place, improving its stability, but also seals the cable's perimeter, reducing the entry of dust and moisture into the sealed enclosure, minimizing damage to electrical components, and improving the reliability and stability of the coal mining machine. Furthermore, when the cable moves, the air bladder's fixation reduces damage to the cable and minimizes gaps between the cable and the air bladder, better ensuring the airtightness of the control box.

[0015] Preferably, the side wall of the cable connection cavity is provided with a terminal block, one end of which is inserted into the cavity, and the other end of which is connected to the cable inserted into the cable connection cavity (10).

[0016] By adopting the above technical solution and using terminal blocks to connect cables and electrical components, dust and moisture entering the sealed enclosure can be reduced, thus minimizing damage to electrical components and improving the reliability and stability of the coal mining machine.

[0017] Preferably, the drain pipe and the injection pipe are disposed on the back of the sealed box. A protective cover is provided on the back of the sealed box. The protective cover has an installation cavity for placing the drain pipe and the injection pipe on the side near the sealed box. The protective cover has multiple installation holes.

[0018] By adopting the above technical solution, and by setting up a protective cover in conjunction with the mounting holes, the sealing box can be fixed more conveniently, improving the stability of the sealing box and reducing the impact on the internal sealing of the sealing box. Furthermore, the protective cover protects the drain pipe and the injection pipe, reducing damage to the drain pipe and the injection pipe and ensuring their service life.

[0019] Preferably, the sealed enclosure includes a base and a cover. The cover is composed of a first cover plate and a second cover plate. The first cover plate is rotatably connected to the base, and the second cover plate is rotatably connected to the first cover plate. One of the shielding plates is provided with a connector strip. A connector groove is formed between the first cover plate and the second cover plate. The connector groove is engaged with the connector strip. A positioning locking block is provided at the end of the second cover plate away from the first cover plate. A positioning locking groove is provided on the base to engage with the positioning locking block.

[0020] By adopting the above technical solution, the first cover plate and the second cover plate are used together to close the box seat, which can be closed more conveniently in a relatively narrow room, improving the convenience of opening the sealed box. In addition, by using the plug strip and plug groove, the connection position of the first cover plate and the second cover plate can be locked more conveniently, improving the stability of using the first cover plate and the second cover plate.

[0021] Preferably, the first cover plate and the second cover plate are provided with a plurality of sealing strips on the side near the box base. The sealing strips abut against the box base to seal the box cover. The plug strip is provided with a positioning block on the side near the second cover plate. The positioning block is provided with a guide block on the side away from the plug strip. The guide block is inclined away from the box base in the direction away from the positioning block. The second cover plate is provided with a positioning groove on the side near the sealing strip that engages with the guide block.

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

[0023] Preferably, the first cover plate and the second cover plate are provided with a plurality of air guide strips on the side near the housing base. The air guide strips are disposed between two adjacent ventilation openings and are used to restrict the airflow direction.

[0024] By adopting the above technical solution, when the first and second covers are closed, the air guide strips allow for better airflow circulation within the cavity, ensuring comprehensive airflow and better overall cooling of the electrical components, thus improving the stability of the electrical control cavity. Furthermore, the air guide strips ensure that the airflow is directed more effectively towards the electrical components during its flow, guaranteeing a better cooling effect.

[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. The fixed strip is provided with a plurality of insertion grooves spaced apart. The sliding strip is provided with a plurality of insertion sliders that slide and cooperate with the insertion grooves on the side near the fixed strip.

[0026] By adopting the above technical solution, the position of the sliding bar can be adjusted according to the height of the electrical components in each chamber during use, thereby making it easier to control the airflow direction. When the sliding bar slides, it can open a certain space in the insertion groove to allow airflow, thereby achieving the purpose of restricting airflow and making the airflow cool the electrical components more comprehensively.

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

[0028] 1. Utilizing a sealed enclosure reduces the entry of dust and moisture, minimizing damage to electrical components and improving the reliability and stability of the coal mining machine. Isolating the electrical components within the chamber using shielding plates and metal mesh reduces the impact of magnetic fields generated by these components on the signal acquisition circuit, minimizing electromagnetic interference and improving the stability of the control box. It also allows for closer installation of electrical components, reducing the overall size of the control box. Using a fan accelerates gas circulation within the sealed enclosure, and combining this with water cooling to lower the shielding plates allows the electrical components to operate more effectively, further enhancing the reliability and stability of the coal mining machine. Positioning the circulation chamber on the shielding plate simultaneously provides cooling and separation, improving space utilization, increasing the overall compactness of the control box structure, and reducing its overall size.

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

[0030] 3. Using the first and second cover plates together to close the enclosure allows for easier closure in narrow rooms, improving the convenience of opening the sealed enclosure. Furthermore, the use of the insertion strip and groove allows for easier locking of the connection between the first and second cover plates, enhancing their stability. When the second cover plate rotates, the positioning groove first inserts into the guide block, allowing the second cover plate to compress the sealing strip. Once rotated to its final position, the positioning groove slides into the positioning block, ensuring a more stable fixation of the second cover plate and improving the sealing and stability of the first and second cover plates. Attached Figure Description

[0031] Figure 1This is a schematic diagram of the overall structure of an explosion-proof electrical control box for a coal mining machine according to an embodiment of this application;

[0032] Figure 2 for Figure 1 An enlarged schematic diagram of part A in the middle;

[0033] Figure 3 This is a schematic diagram illustrating the main structure of the ventilation opening in the embodiments of this application;

[0034] Figure 4 for Figure 3 Enlarged schematic diagram of part B in the middle;

[0035] Figure 5 for Figure 3 An enlarged schematic diagram of section C;

[0036] Figure 6 This is a schematic diagram illustrating the protective cover structure, which is the main feature of this application.

[0037] Figure 7 This is a schematic diagram illustrating the sliding bar structure, which is the main feature of this application embodiment.

[0038] Reference numerals: 1. Water chiller; 2. Cable junction box; 3. Box base; 4. Chamber; 5. Air inlet; 6. Inflatable ball; 7. Cable junction box; 8. Air blowing chamber; 9. Fan; 10. Cable plug-in chamber; 11. Ventilation outlet; 12. Shielding plate; 13. Plug-in ring; 14. Mounting ring groove; 15. Terminal block; 16. Airbag ring; 18. First cover plate; 19. Downflow chamber; 20. Flow chamber; 21. Upflow chamber; 22. Sliding bar; 23. Plug-in slider; 24. 25. Insertion groove; 26. Second cover plate; 27. Positioning and locking groove; 28. Positioning and locking block; 29. ​​Mounting cavity; 30. Injection pipe; 31. Circulation cavity; 32. Metal mesh plate; 33. Connecting hole; 34. Heat sink; 35. Air outlet; 36. Insertion strip; 37. Positioning block; 38. Positioning groove; 39. Guide block; 40. Sealing strip; 41. Protective cover; 42. Mounting hole; 43. Drain pipe; 44. Connecting pipe; 45. Insertion groove; 46. Fixing strip. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1 - Figure 7 This application will be described in further detail.

[0040] This application discloses an explosion-proof electrical control box for a coal mining machine.

[0041] Example 1

[0042] Reference Figure 1An explosion-proof electrical control box for a coal mining machine includes a sealed enclosure and a water chiller 1. The sealed enclosure is rectangular, and the water chiller 1 is fixed to one side of the sealed enclosure. Multiple chambers 4 for installing electrical components are provided inside the sealed enclosure. The dimensions of the chambers 4 are manufactured according to the size of the electrical components to be installed. A shielding plate 12 is fixed between adjacent chambers 4. A circulation chamber 30 is provided within the shielding plate 12. The circulation chamber 30 has a ring-shaped structure. A liquid injection pipe 29 and a liquid discharge pipe 42 are fixed on the sealed enclosure to connect the water chiller 1 and the circulation chamber 30, allowing cold water to circulate and cool within the shielding plate 12. Ventilation openings 11 are provided between adjacent chambers 4. The multiple ventilation openings 11, in conjunction with the chambers 4, create a unidirectional airflow within the sealed enclosure. A metal mesh plate 31 is fixed at the opening of the vent 11. An air blowing chamber 8 is fixed in the chamber 4 near the edge, and a fan 9 is fixed at the opening of the air blowing chamber 8. The fan 9 can make the airflow smoother. An air receiving port 5 is fixed in the chamber 4 away from the fan 9. The air receiving port 5 has a funnel-shaped structure. A connecting pipe 43 connects the air receiving port 5 and the air blowing chamber 8. The connecting pipe 43 can make the airflow in the sealed box more smoothly circulate, thereby better dissipating the heat of the electrical components. The shielding plate 12 works 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 lower the temperature inside the control box. Together with the fan 9, it can make the electrical components in the control box cool down more conveniently.

[0043] The shielding plate 12 has a cooling cavity connected to the ventilation opening 11. The cooling cavity is rectangular and extends along the length of the shielding plate 12. Multiple air vents 34 are located on the side of the shielding plate 12 away from the ventilation opening 11, extending along the length of the cooling cavity. Two heat sinks 33 are fixed inside the cooling cavity, extending along its length. The heat sinks 33 divide the cooling cavity into an upper flow cavity 21, a flowing cavity 20, and a lower flow cavity 19. The flowing cavity 20 is connected to the ventilation opening 11. The two heat sinks 33 are inclined away from each other, extending away from the ventilation opening 11. Multiple connecting holes 32 are provided along the length of each heat sink 33. These connecting holes are oblong. The multiple air vents 34 are connected to either the upper flow cavity 21 or the lower flow cavity 19, allowing airflow to be more easily directed to the upper and lower sides of the electrical components, thus better cooling the components.

[0044] The sealed enclosure also houses a cable connector 7. The cable connector 7 has a cable insertion cavity 10 and a cable connection cavity 2. A insertion ring 13 is fixed to the inner wall of the cable connection cavity 2. The outer diameter of the insertion ring 13 gradually decreases away from the cable connection cavity 2. An installation ring groove 14 is formed on the inner wall of the cable insertion cavity 10, and an air bladder ring 16 is fixed within the installation ring groove 14. The air bladder ring 16 abuts against the cable surface. An inflatable ball 6 connected to the air bladder ring 16 is fixed to the sealed enclosure. By pressing the inflatable ball 6, the operator can inflate the air bladder ring 16, achieving a sealing effect on the cable. When the cable moves, the fixation by the air bladder ring 16 reduces damage to the cable and minimizes gaps between the cable and the air bladder, thus better ensuring the sealing performance of the enclosure. A terminal block 15 is fixed to the side wall of the cable connection cavity 2. The terminal block 15 is made of copper. One end of the terminal block 15 is inserted into the cavity 4, and the other end is connected to the cable inserted into the cable connection cavity (10). This can better reduce the entry of dust and moisture into the sealed box, reduce damage to electrical components, and improve the reliability and stability of the coal mining machine.

[0045] The drain pipe 42 and the injection pipe 29 are installed on the back of the sealed housing. A protective cover 40 is fixed on the back of the sealed housing. The protective cover 40 has a mounting cavity 28 for placing the drain pipe 42 and the injection pipe 29 on the side near the sealed housing. Multiple mounting holes 41 are fixed on the protective cover 40. The protective cover 40 can protect the drain pipe 42 and the injection pipe 29, and the mounting holes 41 can make the electrical control box more stable, improving the stability of the electrical control box in use.

[0046] The sealed enclosure includes a base 3 and a cover. The cover consists of a first cover plate 18 and a second cover plate 25. The first cover plate 18 is rotatably connected to the base 3, and the second cover plate 25 is rotatably connected to the first cover plate 18. A connector strip 35 is fixed on one of the shielding plates 12. A connector groove 44 is formed between the first cover plate 18 and the second cover plate 25, and the connector groove 44 is engaged with the connector 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, and a positioning locking groove 26 is fixed on the base 3 to engage with the positioning locking block 27. This allows the cover to be fixed more conveniently.

[0047] Multiple sealing strips 39, made of rubber, are fixed to the side of the first cover plate 18 and the second cover plate 25 near the base 3. The sealing strips 39 abut against the base 3 to seal the cover. A positioning block 36, rectangular in shape, is fixed to the side of the insert 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 insert strip 35. The guide block 38 is inclined away from the base 3 along the direction away from the positioning block 36. A positioning groove 37, which engages with the guide block 38, is formed on the side of the second cover plate 25 near the sealing strip 39. The positioning groove 37 first inserts into the guide block 38, allowing the second cover plate 25 to compress the sealing strip 39. After rotation, the positioning groove 37 slides into the positioning block 36, thus allowing the second cover plate 25 to be more stably fixed, improving the sealing performance and stability of the first cover plate 18 and the second cover plate 25.

[0048] Multiple air guide strips are fixed to the side of the first cover plate 18 and the second cover plate 25 near the base 3. These air guide strips are fixed between two adjacent ventilation openings 11 and are used to restrict the airflow direction, thereby increasing the airflow area within the chamber 4 and ensuring more comprehensive cooling of the electrical components. Each air guide strip consists 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. Multiple insertion grooves 24 are spaced apart on the fixed strip 45, extending along the thickness of the fixed strip 45. Multiple insertion sliders 23, which slide and engage with the insertion grooves 24, are fixed to the side of the sliding strip 22 near the fixed strip 45. The position of the sliding strip 22 can be adjusted according to the height of the electrical components in each chamber 4, allowing for easier control of the airflow direction. Furthermore, when the sliding strip 22 slides, it opens a certain space in the insertion grooves 24 to allow airflow.

[0049] The implementation principle of an explosion-proof electrical control box for a coal mining machine according to this application embodiment is as follows: During installation, the box is installed according to the size of the cavity. After fixing, the first cover plate 18 and the second cover plate 25 are fixed. Using the shielding plate 12 can separate the electrical components in two adjacent chambers 4, reducing the impact of the magnetic field generated by the electrical components on 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 size of the electrical control box. Under the action of the fan 9, the airflow can circulate within the air. Combined with the circulation chamber 30 within the shielding plate 12, this accelerates the cooling of the air. The inclined heat sink 33 allows the airflow to blow towards the upper and lower sides of the electrical components, thereby better improving the cooling effect of the electrical components and enhancing the stability of the electrical control box.

[0050] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An explosion-proof electrical control box for a coal mining machine, characterized in that: The device includes a sealed housing and a water chiller (1). The sealed housing has multiple chambers (4) for installing electrical components. A shielding plate (12) is provided between adjacent chambers (4). A circulation chamber (30) is provided in the shielding plate (12). The sealed housing is provided with an injection pipe (29) and a drain pipe (42) for connecting the water chiller (1) and the circulation chamber (30). A ventilation opening (11) is provided between adjacent chambers (4). A metal mesh plate (31) is provided at the ventilation opening (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). The air receiving port (5) is connected to the air blowing chamber (8). The shielding plate (12) has a cooling cavity that communicates with the ventilation port (11). The cooling cavity is arranged along the length of the shielding plate (12). Multiple air blowing ports (34) are opened on the side of the shielding plate (12) away from the opening of the ventilation port (11). The air blowing ports (34) are opened along the length of the cooling cavity. The cooling cavity is provided with two heat sinks (33), which are arranged along the length of the cooling cavity. The heat sinks (33) divide the cooling cavity into an upper flow cavity (21), a flow cavity (20), and a lower flow cavity (19). The flow cavity (20) is connected to the vent (11). The two heat sinks (33) are inclined in a direction away from the vent (11) and are mutually distancing. The heat sinks (33) have multiple connecting holes (32) along their length. Multiple air outlets (34) are connected to the upper flow cavity (21) or the lower flow cavity (19).

2. The explosion-proof electrical control box for a coal mining machine according to claim 1, characterized in that: The sealed box is also provided with a cable terminal block (7). The cable terminal block (7) has a cable insertion cavity (10) and a cable connection cavity (2). The inner wall of the cable insertion cavity (10) is provided with a insertion ring (13). The outer diameter of the insertion ring (13) gradually decreases in the direction away from the cable connection cavity (2). The inner wall of the cable insertion cavity (10) is provided with an installation ring groove (14). An airbag ring (16) is provided in the installation ring groove (14). The airbag ring (16) is used to abut against the surface of the cable. The sealed box is provided with an inflatable ball (6) connected to the airbag ring (16).

3. The explosion-proof electrical control box for a coal mining machine according to claim 2, characterized in that: The cable connection cavity (2) is provided with a terminal block (15) on its side wall. One end of the terminal block (15) is inserted into the cavity (4), and the other end of the terminal block (15) is connected to the cable inserted into the cable plug cavity (10).

4. The explosion-proof electrical control box for a coal mining machine according to claim 1, characterized in that: The drain pipe (42) and the injection pipe (29) are located on the back of the sealed box. A protective cover (40) is provided on the back of the sealed box. The protective cover (40) has an installation cavity (28) for placing the drain pipe (42) and the injection pipe (29) on the side near the sealed box. The protective cover (40) has multiple installation holes (41).

5. The explosion-proof electrical control box for a coal mining machine according to claim 1, characterized in that: The sealed enclosure includes a base (3) and a cover. The 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 base (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 strip (35). A plug groove (44) is formed between the first cover plate (18) and the second cover plate (25). The plug groove (44) is plugged into the plug strip (35). A positioning locking block (27) is provided at the end of the second cover plate (25) away from the first cover plate (18). A positioning locking groove (26) is provided on the base (3) to engage with the positioning locking block (27).

6. The explosion-proof electrical control box for a coal mining machine according to claim 5, characterized in that: The first cover plate (18) and the second cover plate (25) are provided with a plurality of sealing strips (39) on the side near the box base (3). The sealing strips (39) abut against the box base (3) to seal the box cover. The plug strip (35) is provided with a positioning block (36) on the side near the second cover plate (25). The positioning block (36) is provided with a guide block (38) on the side away from the plug strip (35). The guide block (38) is inclined away from the box base (3) in the direction away from the positioning block (36). The second cover plate (25) is provided with a positioning groove (37) on the side near the sealing strip (39) that is inserted and engaged with the guide block (38).

7. The explosion-proof electrical control box for a coal mining machine according to claim 6, characterized in that: The first cover plate (18) and the second cover plate (25) are provided with a plurality of air guide strips on the side near the box base (3). The air guide strips are arranged between two adjacent ventilation openings (11) and are used to restrict the airflow direction.

8. The explosion-proof electrical control box for a coal mining machine according to claim 7, 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). The fixed strip (45) is provided with a plurality of insertion grooves (24) spaced apart. The sliding strip (22) is provided with a plurality of insertion sliders (23) that slide and cooperate with the insertion grooves (24) on the side near the fixed strip (45).

Images