Mining explosion-proof frequency conversion all-in-one machine

Abstract

The application discloses a mine-used explosion-proof frequency conversion integrated machine, which comprises an outer machine box, a water cooling pipe assembly is arranged in the inner portion of the outer machine box, a spiral pipe is arranged at the bottom of the outer machine box, an air extraction fan is arranged at one side of the bottom of the outer machine box, and the mine-used explosion-proof frequency conversion integrated machine further comprises an air inlet cylinder, the air inlet cylinder is vertically arranged outside the outer machine box, and a one-way air filtering cylinder is arranged in the inner portion of the air inlet cylinder. The lifting piston column repeatedly extrudes the elastic filter cotton arranged in the air inlet cylinder, so that the air filters dust through the elastic filter cotton, and in the process that the lifting piston column extrudes the elastic filter cotton, the lifting pressure plate in the air guide cylinder is lifted in linkage, the second sealing plate is lowered in linkage, the communication position between the air guide cylinder and the outer machine box is sealed, so that the filtered air is retained, so as to contact the glue in the glue settling box, and the small amount of dust entering is further removed.

Description

Technical Field

[0001] This invention relates to the field of mining frequency converter technology, specifically to a mining explosion-proof integrated frequency converter. Background Technology

[0002] The variable frequency integrated machine is a variable frequency motor control system that integrates a frequency converter and a motor. The transmission of large mining equipment adopts the form of high voltage frequency converter combined with high power motor. The integrated structure can reduce the size of the equipment and is more adaptable to the underground working environment.

[0003] Because the underground environment is harsh, with limited space, poor ventilation, and high dust content, which is highly explosive, high-power variable frequency drives (VFDs) must be designed with explosion-proof performance in mind, compared to VFDs used in other environments. Current explosion-proof VFDs, to prevent direct contact between the machine body and internal reactors and the underground environment, use a sealed structure for both the motor and the VFD. This introduces heat dissipation issues. Since air cooling is difficult to achieve with a sealed structure, water cooling is generally required in conjunction with VFDs.

[0004] Chinese Patent Publication No. CN114520565A, entitled "An Explosion-Proof Variable Frequency Integrated Machine for Mining," includes: a motor, a frequency converter, a water tank, a housing, and a heat sink. The water tank is fixedly connected to the motor; the heat sink is fixedly connected to the tail end of the motor, and a drive shaft is installed inside the heat sink, which is fixedly connected to the motor rotor shaft; the housing is fixedly connected to the heat sink, and a liquid pump is installed inside the housing. This explosion-proof variable frequency integrated machine integrates the water tank, water pump, etc., into a single unit, eliminating the need for an external water cooling system, reducing the occupation of underground space and additional construction work.

[0005] The shortcomings of this existing technical solution are as follows: This existing technical solution is equipped with a turbofan and uses air cooling to assist heat dissipation, so it is necessary to have both air intake and exhaust. However, in this existing technical solution, the air intake only enters the separator through the air intake pipe to form a cyclone. The dust removal is carried out solely by the centrifugal force generated by the cyclone. This method has a generally poor dust removal effect. Dust in the center of the airflow can still easily enter the machine body with the airflow. In the case of a large amount of dust in the environment, it is even more difficult to guarantee the dust removal effect, which will still affect the explosion-proof performance of the internal equipment. Summary of the Invention

[0006] In order to overcome the above-mentioned technical problems, the purpose of this invention is to provide an explosion-proof frequency converter for mining.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] A mining explosion-proof variable frequency drive (VFD) unit includes an external chassis, an internal water-cooled pipe assembly, a spiral pipe at the bottom of the chassis, and an exhaust fan on one side of the bottom of the chassis. The mining explosion-proof VFD unit also includes:

[0009] An air intake cylinder is vertically installed outside the outer casing. A one-way ventilation filter is installed inside the air intake cylinder. A lifting piston column that cooperates with the one-way ventilation filter is installed above the air intake cylinder. An air intake channel is opened on the lifting piston column, and a one-way air valve is installed at the bottom of the air intake channel.

[0010] An air guide tube is provided between the air inlet tube and the outer casing. A lifting pressure plate is provided inside the air guide tube, and a reverse linkage component is connected between the lifting pressure plate and the lifting piston column.

[0011] Settling glue boxes, two of which are respectively located at the bottom of the air inlet cylinder and the bottom of the air guide cylinder;

[0012] A regulating valve assembly is disposed between the air guide cylinder and the air inlet cylinder.

[0013] As a further embodiment of the present invention: the regulating valve assembly includes a first sealing plate, which is connected to the lifting pressure plate; a second sealing plate is slidably connected between the air guide tube and the outer casing; and a second linkage steel wire is connected between the second sealing plate and the lifting pressure plate.

[0014] As a further aspect of the present invention: a strip groove is provided on the first sealing plate, and the lifting pressure plate is slidably connected to the first sealing plate through the strip groove, and a spring is connected between the lifting pressure plate and the strip groove.

[0015] As a further aspect of the present invention: the reverse linkage assembly includes a drive motor, which is connected to the top side of the air intake cylinder. The main shaft end of the drive motor is coaxially connected to a winding column and a drive gear. A first linkage steel wire is provided on the winding column. A fixed pulley that cooperates with the first linkage steel wire is connected above the air intake cylinder. A guide assembly is connected between the end of the first linkage steel wire and the lifting piston column. A rack that meshes with the drive gear is connected to the lifting pressure plate.

[0016] As a further aspect of the present invention: the guide assembly includes a connecting guide sleeve, the connecting guide sleeve being connected to the air intake cylinder, a guide rod cooperating with the connecting guide sleeve being connected to one side of the top end of the lifting piston rod, and the end of the first linkage steel wire being connected to the top end of the guide rod.

[0017] As a further aspect of the present invention: the one-way ventilation filter cartridge includes a fixed mesh cylinder connected inside the air inlet cylinder, an elastic filter cotton connected to the inner wall of the fixed mesh cylinder, an outer sleeve sleeved outside the fixed mesh cylinder, a plurality of air holes evenly opened on the outer sleeve, and a plurality of one-way sealing plates that cooperate with the corresponding air holes are movably connected to the outer wall of the outer sleeve by a spring-loaded hinge.

[0018] As a further aspect of the present invention: a vacuum cleaner is connected to the top of the lifting piston column, and multiple sliding tubes are distributed circumferentially on the lifting piston column. Each sliding tube slides through the lifting piston column. The top end of the sliding tube is connected to the suction end of the vacuum cleaner through a flexible tube. A bent tube head is provided at the bottom end of the sliding tube, and a friction block is connected to the bottom of the bent tube head.

[0019] As a further aspect of the present invention: the bottom circumferential of the lifting piston column is provided with multiple storage slots that cooperate with the bent tube head.

[0020] The beneficial effects of this invention are:

[0021] 1. In this invention, the lifting piston column repeatedly squeezes the elastic filter cotton installed in the air inlet cylinder, allowing air to pass through the elastic filter cotton to filter dust. During the process of the lifting piston column descending and squeezing the elastic filter cotton, the lifting pressure plate in the air guide cylinder rises in conjunction, causing the second sealing plate to descend in conjunction, sealing the connection between the air guide cylinder and the external casing. This allows the filtered air to be retained, so as to come into contact with the glue in the settling glue box and further remove any small amount of dust that has entered. When the lifting piston column rises and resets, the lifting pressure plate in the air guide cylinder descends in conjunction, so as to force the air entering the air guide cylinder into the external casing, which facilitates the cooling of the internal heat conduction spiral tube and provides explosion-proof treatment for the frequency converter.

[0022] 2. Each time the lifting piston column of the present invention rises, the friction block at its bottom rubs against the elastic filter cotton. The friction block is subjected to downward frictional resistance, which drives the bent tube head connected to the vacuum cleaner to descend, thereby vacuuming the elastic filter cotton so that the elastic filter cotton can be used continuously. Attached Figure Description

[0023] The invention will now be further described with reference to the accompanying drawings.

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure in which the lifting piston rod and the drive motor are connected in cooperation in this invention;

[0026] Figure 3 yes Figure 2Enlarged structural diagram at point B;

[0027] Figure 4 This is a top view schematic diagram of the connection between the drive gear, the winding column, and the drive motor in this invention;

[0028] Figure 5 This is a schematic diagram of the structure in which the elastic filter cotton and the fixed mesh tube are connected in this invention;

[0029] Figure 6 yes Figure 1 A magnified structural diagram of point A in the middle.

[0030] In the diagram: 1. External casing; 2. Water-cooled pipe assembly; 3. Exhaust fan; 4. Spiral tube; 5. Fixed mesh tube; 6. Air inlet; 7. Settling glue box; 8. Lifting piston column; 9. Vacuum cleaner; 10. Slide tube; 11. Connecting guide sleeve; 12. First linkage steel wire; 13. Fixed pulley; 14. Drive motor; 15. Drive gear; 16. Bending pipe head; 17. Friction block; 18. Storage slot; 19. Air inlet channel; 20. One-way air valve; 21. Winding column; 22. Elastic filter cotton; 23. Outer sleeve; 24. Air hole; 25. One-way sealing plate; 26. Rack; 27. Connecting sleeve; 28. Second sealing plate; 29. ​​Second linkage steel wire; 30. Lifting pressure plate; 31. First sealing plate; 32. Strip groove; 33. Spring; 34. Air guide tube; 35. Guide rod. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] like Figures 1-6As shown, a mine-use explosion-proof frequency converter integrated machine includes an external casing 1, which is an integrated enclosure. Inside the external casing 1 is a water-cooled pipe assembly 2, which includes a liquid pump and heat-conducting pipes. The heat-conducting pipes are laid along the inner wall of the external casing 1, with a section of the top of the heat-conducting pipes extending outside the external casing 1 to facilitate heat exchange with the external environment. This allows the heat generated by the frequency converter components inside the external casing 1 during operation to be exchanged to the flowing cooling water through the heat-conducting pipes. The cooling water circulates along the heat-conducting pipes, driven by the liquid pump. The bottom of the chassis 1 is provided with a spiral tube 4 that is connected to the water cooling pipe assembly 2. The spiral tube 4 is used to extend the flow time of the cooling water inside the outer chassis 1. An exhaust fan 3 is installed on one side of the bottom of the outer chassis 1. The exhaust fan 3 is used to draw the internal air of the outer chassis 1 outward so that the spiral tube 4 at the bottom can be cooled by airflow, and the cooling water can be cooled indirectly. Since the inverter integrated machine includes a motor, the rotating end of the exhaust fan 3 can be connected to the main shaft end of the motor to achieve linkage. An air inlet 6 is provided on the other side of the bottom of the outer chassis 1.

[0033] An internal one-way ventilation filter is installed in the air intake cylinder 6. A lifting piston rod 8, which cooperates with the one-way ventilation filter, is installed above the air intake cylinder 6. The one-way ventilation filter includes a fixed mesh cylinder 5, which is fixedly connected to the inside of the air intake cylinder 6 and has an open top. The outer edge of the top of the fixed mesh cylinder 5 is sealed to the inner wall of the air intake cylinder 6. The lifting piston rod 8 and the top of the fixed mesh cylinder 5 are in a piston-like engagement. An elastic filter cotton 22 is connected to the inner wall of the fixed mesh cylinder 5, covering the inner wall of the fixed mesh cylinder 5. The elastic filter cotton 22 at each position and distributed therein all protrude towards the center. An outer sleeve 23 is fixedly sleeved on the outside of the fixed mesh cylinder 5. Multiple air holes 24 are evenly opened on the outer sleeve 23. Multiple one-way sealing plates 25 that cooperate with the corresponding air holes 24 are movably connected to the outer wall of the outer sleeve 23 through a spring hinge. The one-way sealing plates 25 can only rotate in the direction away from the elastic filter cotton 22, so that air can pass through the elastic filter cotton 22 and then flow out from the air holes 24, but cannot flow into the elastic filter cotton 22 from the air holes 24.

[0034] When the lifting piston column 8 descends, it presses down into the interior of the fixed mesh cylinder 5, compressing the air inside and the elastic filter cotton 22 distributed inside. This causes the air inside the fixed mesh cylinder 5 to pass through the elastic filter cotton 22 and be discharged from the air holes 24 distributed in the outer sleeve 23, entering the interior space of the air intake cylinder 6. During this process, the elastic filter cotton 22 blocks dust from passing through.

[0035] An air intake channel 19 is provided through the center of the lifting piston column 8. A one-way valve 20 is installed at the bottom of the air intake channel 19. The one-way valve 20 only allows air to flow from top to bottom in the air intake channel 19, and prevents it from flowing from bottom to top. In this way, when the lifting piston column 8 descends, it can effectively compress air through the elastic filter cotton 22 and prevent it from being discharged from the air intake channel 19. When the lifting piston column 8 rises, the air intake channel 19 allows external air to enter the fixed mesh cylinder 5 so that the elastic filter cotton 22 can be inflated and restored. During this process, the one-way sealing plate 25 seals all the air holes 24 to prevent the elastic filter cotton 22 from sucking air from the air intake cylinder 6 during the restoration process.

[0036] The bottom of the air intake cylinder 6 is provided with a settling glue box 7. The settling glue box 7 is a detachable box, and each part is filled with glue. The settling glue box 7 facilitates the settling and adhesion of a small amount of dust mixed in the air entering the air intake cylinder 6 to the glue.

[0037] A vacuum cleaner 9 is fixedly connected to the top of the lifting piston column 8. A pressure sensor switch electrically connected to the vacuum cleaner 9 is installed on the top of the lifting piston column 8. Multiple slide tubes 10 are distributed circumferentially on the lifting piston column 8. Each slide tube 10 slides through the lifting piston column 8. The top of the slide tube 10 is connected to the suction end of the vacuum cleaner 9 through a hose. The top of the slide tube 10 is provided with a protrusion that can function as a pressure sensor switch. A bent tube head 16 is provided at the bottom of the slide tube 10. A friction block 17 is connected to the bottom of the bent tube head 16. Multiple storage slots 18 that cooperate with the bent tube head 16 are opened circumferentially on the bottom of the lifting piston column 8.

[0038] When the lifting piston column 8 descends, the friction blocks 17 distributed circumferentially at the bottom press against the elastic filter cotton 22 on the inner wall of the fixed mesh cylinder 5, causing friction between them. The friction blocks 17 then experience upward frictional resistance, causing the bent tube head 16 to slide upward via the slide tube 10. In this way, the bent tube head 16 is put into the storage groove 18, avoiding action on the elastic filter cotton 22. When the lifting piston column 8 rises, friction still exists between the friction blocks 17 and the elastic filter cotton 22. The friction blocks 17 experience downward frictional resistance, causing the bent tube head 16 to slide down via the slide tube 10 and protrude from the bottom of the lifting piston column 8. In this way, the vacuum cleaner 9 is started, creating negative pressure at the bent tube head 16, which facilitates the removal of dust from the elastic filter cotton 22 during the upward movement of the lifting piston column 8, so that the elastic filter cotton 22 can be used continuously.

[0039] An air guide tube 34 is connected between the air inlet 6 and the outer casing 1, and the bottom of the air guide tube 34, the bottom of the air inlet 6 and the bottom of the outer casing 1 are horizontally connected. A settling glue box 7 is also provided at the bottom of the air guide tube 34, that is, there are two settling glue boxes 7. A lifting pressure plate 30 is provided inside the air guide tube 34, and a reverse linkage component is connected between the lifting pressure plate 30 and the lifting piston column 8.

[0040] The reverse linkage component includes a drive motor 14, which can continuously rotate in both directions during operation. A limit switch is set at a fixed point for control. The drive motor 14 is fixedly connected to the top side of the air intake cylinder 6. The main shaft end of the drive motor 14 is coaxially connected to a winding column 21 and a drive gear 15. A first linkage steel wire 12 is wound on the winding column 21. A fixed pulley 13 that cooperates with the first linkage steel wire 12 is fixedly connected to the top of the air intake cylinder 6 through a rod. A guide component is connected between the end of the first linkage steel wire 12 and the lifting piston column 8. The guide component includes a connecting guide sleeve 11, which is fixedly connected to the air intake cylinder 6 through a rod. A guide rod 35 that cooperates with the connecting guide sleeve 11 is vertically fixedly connected to one side of the top of the lifting piston column 8. The end of the first linkage steel wire 12 is connected to the top of the guide rod 35. The guide rod 35 and the connecting guide sleeve 11 cooperate with each other to make the lifting piston column 8 move up and down smoothly.

[0041] A rack 26 that meshes with the drive gear 15 is fixedly connected to the lifting pressure plate 30. A connecting sleeve 27 is fixedly connected to the outer wall of the air inlet cylinder 6. The rack 26 slides through the connecting sleeve 27. When the drive motor 14 drives the drive gear 15 to rotate clockwise, causing the rack 26 to drive the lifting pressure plate 30 to rise relative to the air guide cylinder 34, the winding column 21 at the main shaft end of the drive motor 14 rotates to release the wound first linkage steel wire 12. This allows the lifting piston column 8 to descend by gravity, that is, the lifting pressure plate 30 and the lifting piston column 8 move in opposite directions synchronously.

[0042] A regulating valve assembly is provided between the air guide cylinder 34 and the air inlet cylinder 6. The regulating valve assembly includes a first sealing plate 31, which is connected to the lifting pressure plate 30 and is close to the air inlet cylinder 6. The first sealing plate 31 is used to block the communication position between the air inlet cylinder 6 and the air guide cylinder 34. A strip groove 32 is provided on the first sealing plate 31. The lifting pressure plate 30 is slidably connected to the first sealing plate 31 through the strip groove 32. A spring 33 is connected between the lifting pressure plate 30 and the strip groove 32. The spring 33 is in a compressed state as shown in the figure. A second sealing plate 28 is slidably connected between the air guide cylinder 34 and the outer casing 1. The second sealing plate 28 slides longitudinally and is used to block the communication position between the air guide cylinder 34 and the outer casing 1. A second linkage steel wire 29 is connected between the second sealing plate 28 and the lifting pressure plate 30. The second linkage steel wire 29 rests on the top edge of the air guide cylinder 34.

[0043] When the lifting piston column 8 descends and compresses the air inside the fixed mesh cylinder 5, the lifting pressure plate 30 rises in conjunction. During the rising process, the second sealing plate 28 slides down under gravity, sealing the connection between the air guide cylinder 34 and the outer casing 1. When the lifting pressure plate 30 rises to the top of the first sealing plate 31, it drives the first sealing plate 31 to rise as well, thereby opening the connection between the air guide cylinder 34 and the air intake cylinder 6, allowing the dust-removed air in the air intake cylinder 6 to enter the inner space of the air guide cylinder 34. When the lifting piston column 8 rises, the lifting pressure plate 30 descends in conjunction. During this process, the lifting pressure plate 30 first drives the first sealing plate 31 to descend, sealing the connection between the air intake cylinder 6 and the air guide cylinder 34. When the first sealing plate 31 reaches the sealing position... As the lifting pressure plate 30 continues to descend, it slides down relative to the first sealing plate 31 along the strip groove 32. During this process, the second linkage steel wire 29 between the lifting pressure plate 30 and the second sealing plate 28 is taut. Then, under the traction of the second linkage steel wire 29, the second sealing plate 28 is pulled up and slids up, opening the connection between the air guide cylinder 34 and the outer casing 1. At the same time, as the lifting pressure plate 30 descends, the air entering the air guide cylinder 34 is forced out through the connection between the air guide cylinder 34 and the outer casing 1, allowing the dust-removed air to enter the outer casing 1. Then, under the action of the exhaust fan 3 at the other end of the bottom of the outer casing 1, it flows laterally and acts on the spiral tube 4, generating heat and exchanging heat with the spiral tube 4, carrying away the heat and achieving heat dissipation. At the same time, it can also prevent dust and achieve an explosion-proof effect.

[0044] The working principle of this invention: The drive motor 14 repeatedly performs forward and reverse rotation. When the drive motor 14 drives the winding column 21 to rotate clockwise, the winding column 21 rotates and releases the first linked steel wire 12, thus facilitating the descent of the lifting piston column 8 by gravity. The lifting piston column 8 descends and compresses the interior of the fixed mesh cylinder 5, compressing the air inside. At the same time, it also compresses the elastic filter cotton 22 distributed inside, causing the air inside the fixed mesh cylinder 5 to pass through the elastic filter cotton 22 and be discharged from the air holes 24 distributed in the outer sleeve 23. The air enters the internal space of the air intake cylinder 6, and during this process, the elastic filter cotton 22 blocks the dust from passing through. After the lifting piston column 8 touches the bottom, the drive motor 14 moves counterclockwise, driving the winding column 21 to rotate and wind the first linkage steel wire 12, so that the lifting piston column 8 rises. At this time, the air intake channel 19 facilitates the entry of external air into the fixed mesh cylinder 5, so that the elastic filter cotton 22 can be inflated and restored. During this process, the one-way sealing plate 25 seals each air hole 24 to prevent the elastic filter cotton 22 from sucking air from the inside of the air intake cylinder 6 during the restoration process.

[0045] When the lifting piston column 8 descends, the friction blocks 17 distributed circumferentially at the bottom press against the elastic filter cotton 22 on the inner wall of the fixed mesh cylinder 5, and friction occurs between them. The friction blocks 17 are subjected to upward frictional resistance, which causes the bent tube head 16 to slide upward by relying on the slide tube 10. In this way, the bent tube head 16 is put into the storage groove 18 to avoid acting on the elastic filter cotton 22. When the lifting piston column 8 rises, there is still friction between the friction blocks 17 and the elastic filter cotton 22. The friction blocks 17 are subjected to downward frictional resistance, which causes the bent tube head 16 to slide down by relying on the slide tube 10 and protrude from the bottom of the lifting piston column 8. In this way, the vacuum cleaner 9 is started, which creates negative pressure at the bent tube head 16, so that the dust on the elastic filter cotton 22 can be sucked away during the rising process of the lifting piston column 8, so that the elastic filter cotton 22 can be used continuously.

[0046] The air entering the air intake 6 flows downwards. When it passes the location of the settling glue box 7, a small amount of dust mixed in the air can settle and adhere to the glue in the settling glue box 7.

[0047] As the lifting piston column 8 descends and compresses the air inside the fixed mesh cylinder 5, the drive gear 15 at the main shaft end of the drive motor 14 rotates clockwise, thereby driving the lifting pressure plate 30 to rise via the rack 26. During the rising process of the lifting pressure plate 30, the second sealing plate 28 slides down under gravity, sealing the connection between the air guide cylinder 34 and the outer casing 1. When the lifting pressure plate 30 rises to the top of the first sealing plate 31, it drives the first sealing plate 31 to rise as well, thereby opening the connection between the air guide cylinder 34 and the air inlet cylinder 6, allowing the dust-removed air in the air inlet cylinder 6 to enter the inner space of the air guide cylinder 34. When the lifting piston column 8 rises, the lifting pressure plate 30 descends in conjunction. During this process, the lifting pressure plate 30 first drives the first sealing plate 31 to descend, sealing the connection between the air inlet cylinder 6 and the air guide cylinder 34. When the first sealing plate 31 reaches the sealing position, the lifting pressure plate 30 continues to descend and slides down relative to the first sealing plate 31 along the strip groove 32. During this process, the second linkage steel wire 29 between the lifting pressure plate 30 and the second sealing plate 28 is taut. Then, under the traction of the second linkage steel wire 29, the second sealing plate 28 is pulled up and slides open, opening the connection between the air guide cylinder 34 and the outer casing 1. At the same time, as the lifting pressure plate 30 descends, the air entering the air guide cylinder 34 is forced out from the connection between the air guide cylinder 34 and the outer casing 1, allowing the dust-removed air to enter the outer casing 1. Then, under the action of the exhaust fan 3 at the other end of the bottom of the outer casing 1, it flows laterally and acts on the spiral tube 4, generating heat and exchanging heat with the spiral tube 4, carrying away the heat and achieving heat dissipation. At the same time, it can also prevent dust and achieve the explosion-proof effect.

[0048] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A mining explosion-proof frequency converter, comprising an external casing (1), wherein a water-cooled pipe assembly (2) is provided inside the external casing (1), a spiral pipe (4) is provided at the bottom of the external casing (1), and an exhaust fan (3) is provided on one side of the bottom of the external casing (1), characterized in that, Also includes: An air intake cylinder (6) is vertically installed outside the outer casing (1). A one-way air filter is installed inside the air intake cylinder (6). A lifting piston column (8) that cooperates with the one-way air filter is installed above the air intake cylinder (6). An air intake channel (19) is opened on the lifting piston column (8). A one-way air valve (20) is installed at the bottom of the air intake channel (19). Air guide cylinder (34), the air guide cylinder (34) is disposed between the air inlet cylinder (6) and the outer casing (1), the air guide cylinder (34) is provided with a lifting pressure plate (30), and a reverse linkage assembly is connected between the lifting pressure plate (30) and the lifting piston column (8); The reverse linkage assembly includes a drive motor (14), which is connected to the top side of the air inlet cylinder (6). The main shaft end of the drive motor (14) is coaxially connected to a winding column (21) and a drive gear (15). A first linkage wire (12) is provided on the winding column (21). A fixed pulley (13) that cooperates with the first linkage wire (12) is connected above the air inlet cylinder (6). A guide assembly is connected between the end of the first linkage wire (12) and the lifting piston column (8). A rack (26) that meshes with the drive gear (15) is connected on the lifting pressure plate (30). Settling glue box (7), two sets of settling glue boxes (7) are provided, and are respectively located at the bottom of the air inlet cylinder (6) and the bottom of the air guide cylinder (34); A regulating valve assembly is disposed between the air guide cylinder (34) and the air inlet cylinder (6); The control valve assembly includes a first sealing plate (31), which is connected to the lifting pressure plate (30). A second sealing plate (28) is slidably connected between the air guide cylinder (34) and the outer casing (1). A second linkage steel wire (29) is connected between the second sealing plate (28) and the lifting pressure plate (30). The first sealing plate (31) is provided with a strip groove (32), and the lifting pressure plate (30) is slidably connected to the first sealing plate (31) through the strip groove (32). A spring (33) is connected between the lifting pressure plate (30) and the strip groove (32). The guide assembly includes a connecting guide sleeve (11), which is connected to the air inlet cylinder (6). A guide rod (35) that cooperates with the connecting guide sleeve (11) is connected to one side of the top end of the lifting piston column (8). The end of the first linkage wire (12) is connected to the top end of the guide rod (35).

2. The mining explosion-proof frequency converter as described in claim 1, characterized in that, The one-way ventilation filter cartridge includes a fixed mesh cylinder (5), which is connected inside the air inlet cylinder (6). An elastic filter cotton (22) is connected to the inner wall of the fixed mesh cylinder (5). An outer sleeve (23) is fitted on the outside of the fixed mesh cylinder (5). Multiple air holes (24) are evenly opened on the outer sleeve (23). Multiple one-way sealing plates (25) that cooperate with the corresponding air holes (24) are movably connected to the outer wall of the outer sleeve (23) through a spring hinge.

3. The explosion-proof frequency converter for mining as described in claim 1, characterized in that, The top of the lifting piston column (8) is connected to a vacuum cleaner (9). Multiple sliding tubes (10) are distributed circumferentially on the lifting piston column (8). Each sliding tube (10) slides through the lifting piston column (8). The top of the sliding tube (10) is connected to the vacuuming end of the vacuum cleaner (9) through a hose. A bent tube head (16) is provided at the bottom of the sliding tube (10). A friction block (17) is connected to the bottom of the bent tube head (16).

4. The explosion-proof frequency converter for mining as described in claim 3, characterized in that, The bottom circumferential opening of the lifting piston column (8) is provided with multiple storage slots (18) that cooperate with the bent tube head (16).

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