Coal mine underground explosion-proof electric appliance switch

Abstract

The invention relates to the technical field of explosion-proof switches, in particular to a coal mine underground explosion-proof electric appliance switch which comprises a machine base, an explosion-proof cabinet, an air blowing mechanism, a monitoring mechanism and a speed increasing mechanism. An air channel is formed in the inner wall of the explosion-proof cabinet, an air outlet support is arranged on the explosion-proof cabinet, an air outlet is formed in the air outlet support, and the air channel penetrates through the inner wall of the explosion-proof cabinet; the air outlet support is connected with the upper end of the air duct, the air blowing mechanism comprises a bearing seat fixedly arranged at the bottom of the explosion-proof cabinet, an adapter pipe coaxially and fixedly arranged on the bearing seat, an air cover coaxially and fixedly arranged on the adapter pipe, an impeller rotationally arranged in the air cover and a power output end used for driving the impeller to rotate, and the bearing seat is connected with the air duct; the monitoring mechanism comprises a monitoring output end, the monitoring output end is used for monitoring the temperature in the explosion-proof cabinet, the speed increasing mechanism is provided with a speed increasing output end, the speed increasing output end is in transmission connection with the impeller, the monitoring output end is in transmission connection with the speed increasing output end, the device can adaptively adjust the temperature of the explosion-proof electric appliance cabinet, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of explosion-proof switches, in particular to an explosion-proof electrical switch for underground coal mines. Background Art

[0002] Explosion-proof electrical switches in underground coal mines are electrical devices designed to operate safely in environments with flammable and explosive gases, such as those found underground. Through specialized design and manufacturing processes, these switches prevent dangerous sparks and arcs generated during operation, thereby preventing fires and explosions. Coal mines contain large quantities of flammable and explosive gases, such as methane. By limiting the electrical energy consumed by the equipment during operation, these switches prevent sparks from coming into contact with flammable and explosive gases and causing an explosion. In the event of an electrical fault, these switches can quickly shut off power, preventing the fault from escalating and potentially causing fires. This function is crucial for protecting equipment and personnel underground in coal mines. Explosion-proof electrical switches play a vital role in underground coal mine electrical systems, ensuring stable operation under harsh conditions and providing reliable power for coal mine production.

[0003] A Chinese patent application, publication number (CN210866946U), discloses an explosion-proof switchgear for underground coal mines, comprising a housing. The housing is provided with an explosion-proof layer on the outside, with multiple air outlets located at the top of the layer. Multiple universal wheels are connected to the bottom of the layer. Multiple explosion-proof chambers are evenly spaced side by side within the housing. A sandwich channel is provided between the inner wall of the housing and the outer wall of the explosion-proof chambers. Airflow channels are provided on the left and right sides of the explosion-proof chambers, each communicating with the sandwich channel. An explosion-proof layer is provided between adjacent explosion-proof chambers. Cooling chambers are provided on the left and right sides of the housing, with multiple exhaust fans evenly spaced from bottom to top within the cooling chambers. This underground coal mine explosion-proof switchgear has a simple structure and compact layout, fully utilizing the internal space and facilitating transportation. The airflow channels, sandwich channels, and exhaust fans facilitate air circulation, preventing heat accumulation and improving heat dissipation efficiency.

[0004] Explosion-proof electrical switches contain a variety of conductive components, such as busbars and connectors. When current passes through these components, the inherent resistance of the components generates a certain amount of heat. This heat generation is particularly pronounced when the current is high or the resistance of the components is high. Over long-term operation, this accumulated heat can cause the temperature of the electrical switch to rise. This is particularly problematic in relatively closed environments like underground coal mines with limited ventilation. However, higher ambient temperatures make it more difficult for explosion-proof electrical switches to dissipate heat, making it more difficult to dissipate the generated heat in a timely manner. This can cause the internal temperature of the switch to rise, further increasing heat generation. Traditional explosion-proof switches are unable to effectively improve heat dissipation when the ambient temperature rises. Therefore, how to automatically increase heat dissipation in explosion-proof switches when the ambient temperature rises is a pressing issue. Summary of the Invention

[0005] Based on this, it is necessary to provide an explosion-proof electrical switch for underground coal mines in response to the existing technical problems.

[0006] In order to solve the problems of the existing technology, the technical solution adopted by the present invention is: an explosion-proof electrical switch in a coal mine, including a machine base, an explosion-proof cabinet, a blower mechanism, a monitoring mechanism and an increasing speed mechanism. An air duct is opened on the inner wall of the explosion-proof cabinet, and an air outlet support is provided on the explosion-proof cabinet. An air outlet is provided on the air outlet support. The air duct runs through the inner wall of the explosion-proof cabinet, and the air outlet support is connected to the upper end of the air duct. The blower mechanism includes a supporting seat fixedly arranged at the bottom of the explosion-proof cabinet, a transfer pipe coaxially fixed on the supporting seat, a wind hood coaxially fixed on the transfer pipe, an impeller rotatably arranged in the wind hood and a power output end for driving the impeller to rotate. The supporting seat is connected to the air duct. The monitoring mechanism includes a monitoring output end, which is used to monitor the temperature inside the explosion-proof cabinet. The increasing speed mechanism has an increasing speed output end, which is transmission-connected to the impeller, and the monitoring output end is transmission-connected to the increasing speed output end.

[0007] Furthermore, the hair dryer mechanism also includes a supporting box fixedly arranged at the bottom of the explosion-proof cabinet, a supporting frame coaxially fixedly arranged in the wind hood, a supporting shaft coaxially rotatably arranged on the supporting frame, and three air supply flat tubes arranged on the outer wall of the supporting seat, one end of the air supply flat tube is connected to the supporting box, and the other end is connected to the inside of the supporting seat, the supporting box is connected to the air duct, one end of the supporting shaft is coaxially rotatably connected to the supporting frame, and the other end is coaxially rotatably connected to the wind hood, the impeller is coaxially fixedly connected to the supporting shaft, and the power output end of the hair dryer mechanism is transmission-connected to the supporting shaft.

[0008] Furthermore, the monitoring mechanism also includes a monitoring plate fixedly arranged at the bottom of the explosion-proof cabinet, a transfer tube fixedly arranged below the explosion-proof cabinet, and a piston rod coaxially elastically slidably arranged in the transfer tube. A cavity is opened in the monitoring plate, and a hose is arranged between the transfer tube and the monitoring plate. One end of the hose is connected to the cavity inside the monitoring plate, and the other end is connected to the transfer tube. The piston rod is dynamically sealed with the inner wall of the transfer tube. The piston rod is the monitoring output end of the monitoring mechanism, and the piston rod is connected to the speed increase output end.

[0009] Furthermore, the speed increasing mechanism also includes a driving motor fixedly arranged under the explosion-proof cabinet, two bearing support plates symmetrically fixedly arranged at the bottom of the explosion-proof cabinet, a transmission rod rotatably arranged on the bearing support plate, two support frames symmetrically fixedly arranged on the sides of the transmission rod, a conical tube rotatably arranged on the support frame and a transmission wheel coaxially arranged on the transmission rod, at least two limiting grooves are opened in a ring shape on the side wall of the transmission rod, and a limiting protrusion matching the size of the limiting groove is formed on the inner wall of the transmission wheel. The transmission wheel is connected to the piston rod transmission, the transmission wheel conflicts with the conical tube, the transmission rod is connected to the bearing shaft transmission through a pulley and a bevel gear group, the central axis of the conical tube is coaxially fixed with the power shaft of the driving motor, the power shaft of the driving motor is the power output end of the hair dryer mechanism, the transmission rod is the speed increasing output end of the speed increasing mechanism, and the busbar of the conical tube is parallel to the axis of the transmission rod.

[0010] Furthermore, the speed increasing mechanism also includes a limit support plate fixedly arranged in a symmetrical state at the bottom of the explosion-proof cabinet, a threaded rod rotatably arranged on the limit support plate, a sliding support coaxially arranged on the threaded rod, and a U-shaped frame fixedly arranged on the sliding support. The threaded rod is transmission-connected to the piston rod, the sliding support is threadedly connected to the threaded rod, and the transmission wheel is rotationally arranged on the U-shaped frame through an axle seat.

[0011] Furthermore, the speed increasing mechanism also includes a worm gear coaxially fixed on the threaded rod, a limit seat fixed on a limit support plate close to the worm gear, a worm rotatably arranged on the limit seat, a transmission gear coaxially fixed on the worm gear, and a transmission rack fixed on the piston rod, the transmission rack is engaged with the transmission gear, and the worm is engaged with the worm gear.

[0012] Furthermore, a wedge-shaped bar is fixedly provided on the transfer tube, a wedge-shaped groove is provided on the transmission rack, and the wedge-shaped bar and the wedge-shaped groove are slidably matched.

[0013] Furthermore, the hair dryer mechanism also includes a protective frame fixedly arranged under the machine base, a rotating ring rotatably arranged on the transfer tube, a connecting ring rotatably arranged on the wind cover, a passive magnetic ring fixedly arranged in the connecting ring, an active magnetic ring coaxially fixed on the load-bearing shaft and a cleaning rod arranged on the rotating ring, one end of the cleaning rod is fixedly connected to the rotating ring, and the other end is fixedly connected to the connecting ring.

[0014] Compared with the prior art, the present invention has the following beneficial effects: Firstly, this device opens an air duct on the inner wall of the explosion-proof cabinet and uses the rotation of the impeller to generate wind to cool the explosion-proof cabinet, thereby improving the heat dissipation efficiency and ensuring long-term operation of the equipment. Second: This device sets up a monitoring mechanism to ensure that when the explosion-proof electrical switch is at a high temperature, the impeller speed is automatically increased, the wind output is increased, and the cooling effect is enhanced; Third: This device prevents the accumulation of impurities or dust by setting a cleaning rod on the wind cover, ensuring that the equipment can operate for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the embodiment; Figure 2 is a three-dimensional structural cross-sectional view of an embodiment; Figure 3 This is a schematic diagram of the exploded three-dimensional structure of the monitoring panel of the embodiment; Figure 4 is a front view of an embodiment; Figure 5 This is a schematic diagram of the three-dimensional structure of the speed increasing mechanism of the embodiment. Figure 1 ; Figure 6 yes Figure 5 A schematic diagram of the structure at center A; Figure 7 This is a schematic diagram of the three-dimensional structure of the speed increasing mechanism of the embodiment. Figure 2 ; Figure 8 3D schematic diagram of the monitoring board and transfer tube of the embodiment; Figure 9 It is a schematic diagram of the three-dimensional structure of the wind shield of the embodiment.

[0016] The numbers in the figure are: 1. Machine base; 2. Protective frame; 3. Explosion-proof cabinet; 4. Air duct; 5. Air outlet support; 6. Air outlet; 7. Limit support plate; 8. Threaded rod; 9. Worm gear; 10. Sliding support; 11. Limit seat; 12. Worm; 13. Transmission gear; 14. Load support plate; 15. Transmission rod; 16. Limit slot; 17. Transmission wheel; 18. U-shaped frame; 19. Monitoring board; 20. Transfer tube ; 21. Piston rod; 22. Transmission rack; 23. Wedge bar; 24. Support frame; 25. Conical tube; 26. Support box; 27. Air supply flat tube; 28. Support seat; 29. ​​Adapter tube; 30. Air hood; 31. Connecting ring; 32. Passive magnetic ring; 33. Rotating ring; 34. Cleaning rod; 35. Carrying frame; 36. Carrying shaft; 37. Impeller; 38. Active magnetic ring; 39. Drive motor. DETAILED DESCRIPTION

[0017] In order to further understand the features, technical means, specific objectives and functions achieved by the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] refer to Figures 1 to 9 : The explosion-proof electrical switch in an underground coal mine includes a machine base 1, an explosion-proof cabinet 3, a blower mechanism, a monitoring mechanism and an increasing speed mechanism. An air duct 4 is opened on the inner wall of the explosion-proof cabinet 3, and an air outlet support 5 is provided on the explosion-proof cabinet 3. An air outlet 6 is provided on the air outlet support 5. The air duct 4 runs through the inner wall of the explosion-proof cabinet 3, and the air outlet support 5 is connected to the upper end of the air duct 4. The blower mechanism includes a supporting seat 28 fixedly arranged at the bottom of the explosion-proof cabinet 3, a transfer pipe 29 coaxially fixedly arranged on the supporting seat 28, a wind cover 30 coaxially fixedly arranged on the transfer pipe 29, an impeller 37 rotatably arranged in the wind cover 30 and a power output end for driving the impeller 37 to rotate, the supporting seat 28 is connected to the air duct 4, the monitoring mechanism includes a monitoring output end, the monitoring output end is used to monitor the temperature inside the explosion-proof cabinet 3, the increasing speed mechanism has an increasing speed output end, the increasing speed output end is transmission-connected to the impeller 37, and the monitoring output end is transmission-connected to the increasing speed output end.

[0019] When the device is in operation, the power output end of the blower mechanism drives the impeller 37 to rotate, and the rotation of the impeller 37 generates wind force, and then the wind force enters the air duct 4 through the supporting seat 28, and is finally blown out from the air outlet 6. In this process, the flowing wind passes through the air duct 4, and takes away the heat generated when the explosion-proof electrical switch is in operation, ensuring the normal operation of the equipment. When the explosion-proof electrical switch runs for too long, the temperature in the explosion-proof cabinet 3 rises. At this time, the monitoring output end of the monitoring mechanism detects the temperature increase, and then the monitoring output end drives the speed-increasing output end of the speed-increasing mechanism to operate. The operation of the speed-increasing output end makes the speed of the impeller 37 faster, thereby increasing the air volume entering the air duct 4 and improving the cooling effect.

[0020] In order to show the detailed structure of the hair dryer in detail, the following features are also set: The hair dryer mechanism also includes a supporting box 26 fixedly arranged at the bottom of the explosion-proof cabinet 3, a supporting frame 35 coaxially fixedly arranged in the wind cover 30, a supporting shaft 36 coaxially rotatably arranged on the supporting frame 35, and three air supply flat tubes 27 arranged on the outer wall of the supporting seat 28. One end of the air supply flat tube 27 is connected to the supporting box 26, and the other end is connected to the inside of the supporting seat 28. The supporting box 26 is connected to the air duct 4. One end of the supporting shaft 36 is coaxially connected to the supporting frame 35 for rotation, and the other end is coaxially connected to the wind cover 30 for rotation. The impeller 37 is coaxially fixedly connected to the supporting shaft 36, and the power output end of the hair dryer mechanism is transmission-connected to the supporting shaft 36.

[0021] When the device is running, the power output end of the hair dryer mechanism drives the supporting shaft 36 to rotate, and the rotation of the supporting shaft 36 drives the impeller 37 to rotate. The rotation of the impeller 37 generates wind, and then the wind enters the air supply flat tube 27 from the supporting seat 28, and then enters the supporting box 26 through the air supply flat tube 27, and finally enters the air duct 4 from the supporting box 26.

[0022] In order to show the detailed structure of the monitoring organization, the following features are also set: The monitoring mechanism also includes a monitoring plate 19 fixedly arranged at the bottom of the explosion-proof cabinet 3, a transfer tube 20 fixedly arranged below the explosion-proof cabinet 3, and a piston rod 21 coaxially elastically slidably arranged in the transfer tube 20. A cavity (such as Figure 8 As shown), a hose is provided between the transfer tube 20 and the monitoring plate 19, one end of the hose is connected to the cavity inside the monitoring plate 19, and the other end is connected to the transfer tube 20, and the piston rod 21 is dynamically sealed with the inner wall of the transfer tube 20. The piston rod 21 is the monitoring output end of the monitoring mechanism, and the piston rod 21 is connected to the speed increasing output end.

[0023] It should be noted that an expansion medium is stored in the cavity inside the monitoring plate 19. This expansion medium can expand when the temperature rises. When the temperature inside the explosion-proof cabinet 3 rises, the expansion medium in the monitoring plate 19 expands due to the heat. Then the expansion medium enters the transfer tube 20 through the hose, and then pushes the piston rod 21 to extend. After the piston rod 21 extends, it drives the speed-increasing output end of the speed-increasing mechanism to move.

[0024] In order to show the detailed structure of the speed-increasing mechanism, the following features are also set: The speed increasing mechanism also includes a drive motor 39 fixedly arranged below the explosion-proof cabinet 3, two bearing support plates 14 fixedly arranged at the bottom of the explosion-proof cabinet 3 in a symmetrical state, a transmission rod 15 rotatably arranged on the bearing support plate 14, two support frames 24 fixedly arranged beside the transmission rod 15 in a symmetrical state, a tapered tube 25 rotatably arranged on the support frame 24 and a transmission wheel 17 coaxially arranged on the transmission rod 15, and at least two limiting grooves 16 are annularly opened on the side wall of the transmission rod 15, and the inner wall of the transmission wheel 17 is provided with a plurality of retaining grooves 16. A limiting protrusion matching the size of the limiting groove 16 is formed on it. The transmission wheel 17 is connected to the piston rod 21, and the transmission wheel 17 conflicts with the tapered tube 25. The transmission rod 15 is connected to the load-bearing shaft 36 through a pulley and a bevel gear group. The central axis of the tapered tube 25 is coaxially fixed with the power shaft of the drive motor 39. The power shaft of the drive motor 39 is the power output end of the hair dryer mechanism, and the transmission rod 15 is the speed-increasing output end of the speed-increasing mechanism. The busbar of the tapered tube 25 is parallel to the axis of the transmission rod 15.

[0025] When the device is running, the driving motor 39 drives the conical tube 25 to rotate, and the rotation of the conical tube 25 drives the transmission wheel 17 to rotate, and the rotation of the transmission wheel 17 drives the transmission rod 15 to rotate. The rotation of the transmission rod 15 drives the bearing shaft 36 to rotate through the pulley and the bevel gear group. When the temperature in the explosion-proof cabinet 3 rises, the piston rod 21 extends, and the piston rod 21 extends to drive the transmission wheel 17 to slide along the axis of the transmission rod 15. This sliding direction is from the small diameter end to the large diameter end of the conical tube 25, thereby increasing the rotation speed of the transmission wheel 17 without changing the rotation speed of the driving motor 39. The faster the rotation speed of the transmission wheel 17, the faster the rotation speed of the transmission rod 15, and finally the faster the rotation speed of the bearing shaft 36, thereby accelerating the rotation of the impeller 37, increasing the output, increasing the air intake, and improving the cooling effect. It should be noted that the transmission between the tapered tube 25 and the transmission wheel 17 is carried out through friction. Since the generatrix of the tapered tube 25 is parallel to the axis of the transmission rod 15, it can be concluded that the axis of the transmission wheel 17 is also parallel to the generatrix of the tapered tube 25, thereby ensuring that the transmission wheel 17 can slide smoothly along the generatrix of the tapered tube 25; the tapered tube 25 can normally drive the transmission wheel 17 to rotate through friction. By selecting suitable materials to control the friction coefficient, optimize the normal pressure, etc., to ensure that the friction is within a suitable range, the friction between them can be used to achieve a stepless speed change function.

[0026] In order to demonstrate the connection relationship between the piston rod 21 and the transmission wheel 17, the following features are specifically provided: The speed increasing mechanism also includes a limit support plate 7 fixedly arranged at the bottom of the explosion-proof cabinet 3 in a symmetrical state, a threaded rod 8 rotatably arranged on the limit support plate 7, a sliding support 10 coaxially arranged on the threaded rod 8 and a U-shaped frame 18 fixedly arranged on the sliding support 10. The threaded rod 8 is transmission-connected to the piston rod 21, the sliding support 10 is threadedly connected to the threaded rod 8, and the transmission wheel 17 is rotationally arranged on the U-shaped frame 18 through the axle seat.

[0027] When the piston rod 21 is extended, the piston rod 21 drives the threaded rod 8 to rotate, and the rotation of the threaded rod 8 drives the sliding support 10 to move, so that the sliding support 10 moves along the threaded rod 8. The sliding support 10 moves and drives the U-shaped frame 18 to move. The movement of the U-shaped frame 18 drives the transmission wheel 17 to slide along the transmission rod 15, thereby adjusting the contact position of the transmission wheel 17 and the tapered tube 25.

[0028] In order to show how the piston rod 21 drives the threaded rod 8 to rotate when it is extended, the following features are specifically provided: The speed increasing mechanism also includes a worm gear 9 coaxially fixed on the threaded rod 8, a limiting seat 11 fixed on the limiting support plate 7 near the worm gear 9, a worm 12 rotatably set on the limiting seat 11, a transmission gear 13 coaxially fixed on the worm 12 and a transmission rack 22 fixed on the piston rod 21, the transmission rack 22 is engaged with the transmission gear 13, and the worm 12 is engaged with the worm gear 9.

[0029] When the piston rod 21 extends, the transmission rack 22 is driven by the piston rod 21 to move together, and then the transmission rack 22 drives the transmission gear 13 to rotate, the rotation of the transmission gear 13 drives the worm 12 to rotate, the rotation of the worm 12 drives the worm wheel 9 to rotate, and the rotation of the worm wheel 9 drives the threaded rod 8 to rotate.

[0030] In order to ensure that the piston rod 21 drives the transmission rack 22 to move more stably, the following features are also provided: The transfer tube 20 is fixed with a wedge-shaped strip 23 (such as Figure 6 As shown), a wedge-shaped groove is provided on the transmission rack 22, and the wedge-shaped bar 23 slides in cooperation with the wedge-shaped groove.

[0031] When the piston rod 21 drives the transmission rack 22 to move, the transmission rack 22 slides on the wedge bar 23 through the wedge groove, so that the movement of the transmission rack 22 is more stable.

[0032] In order to prevent the air hood 30 from being blocked by dust when the device is running, the following features are also provided: The hair dryer mechanism also includes a protective frame 2 fixedly arranged under the machine base 1, a rotating ring 33 rotatably arranged on the transfer tube 29, a connecting ring 31 rotatably arranged on the wind cover 30, a passive magnetic ring 32 fixedly arranged in the connecting ring 31, an active magnetic ring 38 coaxially fixed on the bearing shaft 36 and a cleaning rod 34 arranged on the rotating ring 33, one end of the cleaning rod 34 is fixedly connected to the rotating ring 33, and the other end is fixedly connected to the connecting ring 31.

[0033] When the bearing shaft 36 rotates, the bearing shaft 36 drives the active magnetic ring 38 to rotate, and the rotation of the active magnetic ring 38 drives the connecting ring 31 to rotate through the hysteresis force (it should be noted that there is a hysteresis force between the active magnetic ring 38 and the passive magnetic ring 32, and the magnetism of the active magnetic ring 38 is smaller than that of the passive magnetic ring 32). Since the magnetism of the active magnetic ring 38 is smaller than that of the passive magnetic ring 32, when the active magnetic ring 38 drives the connecting ring 31 to rotate through the hysteresis force, the rotation speed of the connecting ring 31 is smaller than the rotation speed of the active magnetic ring 38. The rotation of the connecting ring 31 drives the cleaning rod 34 to rotate around the wind hood 30, thereby removing the debris accumulated on the wind hood 30 and ensuring the permeability of the wind hood 30. When the connecting ring 31 drives the cleaning rod 34 to rotate, the rotating ring 33 also rotates together. It is worth mentioning that a brush or a cleaning sponge can be provided on the cleaning rod 34 to enhance the cleaning effect. The protective frame 2 can protect the equipment from damage and extend the service life of the equipment.

[0034] The working principle of this device is as follows: when the temperature in the explosion-proof cabinet 3 rises, the expansion medium in the monitoring plate 19 expands due to the heat, and then the expansion medium enters the transfer tube 20 through the hose, thereby pushing the piston rod 21 out, and then the transmission rack 22 is driven by the piston rod 21 to move together, and then the transmission rack 22 drives the transmission gear 13 to rotate, the rotation of the transmission gear 13 drives the worm 12 to rotate, the rotation of the worm 12 drives the worm wheel 9 to rotate, the rotation of the worm wheel 9 drives the threaded rod 8 to rotate, the rotation of the threaded rod 8 drives the sliding support 10 to move, so that the sliding support 10 moves along the threaded rod 8, and the sliding support 10 moves. The U-shaped frame 18 is driven to move, and the movement of the U-shaped frame 18 drives the transmission wheel 17 to slide along the transmission rod 15, thereby adjusting the contact position between the transmission wheel 17 and the tapered tube 25, causing the transmission wheel 17 to slide along the axis of the transmission rod 15, and the sliding direction is from the small diameter end to the large diameter end of the tapered tube 25, thereby increasing the rotation speed of the transmission wheel 17 without changing the rotation speed of the drive motor 39. The faster the rotation speed of the transmission wheel 17, the faster the rotation speed of the transmission rod 15, and finally the faster the rotation speed of the bearing shaft 36, thereby accelerating the rotation of the impeller 37, increasing the output, increasing the air intake, and improving the cooling effect. Wait for the temperature inside the explosion-proof cabinet 3 to drop, the expansion medium to shrink, the piston rod 21 to elastically reset, the reset of the piston rod 21 drives the transmission rack 22 to reset, the reset of the transmission rack 22 causes the transmission gear 13 to reverse, the reversal of the transmission gear 13 drives the worm 12 to reverse, the reversal of the worm 12 drives the worm wheel 9 to reverse, the reversal of the worm wheel 9 drives the threaded rod 8 to reverse, the reversal of the threaded rod 8 causes the sliding support 10 to drive the U-shaped frame 18 to move from the large diameter end of the tapered tube 25 to the small diameter end, and then adaptively reduce the speed of the transmission rod 15. Through the above transmission, the impeller 37 can automatically increase the speed and increase the air intake when the temperature inside the explosion-proof cabinet 3 rises. When the temperature of the explosion-proof cabinet 3 returns to normal, the impeller 37 can adaptively reduce to its original speed.

[0035] The above embodiments merely represent one or several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. Explosion-proof electrical switch for underground coal mines, characterized in that: The invention comprises a machine base (1), an explosion-proof cabinet (3), a blower mechanism, a monitoring mechanism and a speed increasing mechanism. An air duct (4) is provided on the inner wall of the explosion-proof cabinet (3). An air outlet support (5) is provided on the explosion-proof cabinet (3). An air outlet (6) is provided on the air outlet support (5). The air duct (4) runs through the inner wall of the explosion-proof cabinet (3). The air outlet support (5) is connected to the upper end of the air duct (4). The blower mechanism comprises a supporting seat (28) fixedly arranged at the bottom of the explosion-proof cabinet (3), a coaxial fixed seat (28) and a A transfer tube (29), a wind cover (30) coaxially fixedly arranged on the transfer tube (29), an impeller (37) rotatably arranged in the wind cover (30), and a power output end for driving the impeller (37) to rotate; a support seat (28) connected to the air duct (4); a monitoring mechanism including a monitoring output end, the monitoring output end being used to monitor the temperature in the explosion-proof cabinet (3); a speed increasing mechanism having a speed increasing output end, the speed increasing output end being transmission-connected to the impeller (37); and the monitoring output end being transmission-connected to the speed increasing output end.

2. The explosion-proof electrical switch for underground coal mines according to claim 1, characterized in that: The blower mechanism further comprises a support box (26) fixedly arranged at the bottom of the explosion-proof cabinet (3), a support frame (35) coaxially fixedly arranged in the wind cover (30), a support shaft (36) coaxially rotatably arranged on the support frame (35), and three air supply flat tubes (27) arranged on the outer wall of the support seat (28), one end of the air supply flat tube (27) is connected to the support box (26), and the other end is connected to the inside of the support seat (28), the support box (26) is connected to the air duct (4), one end of the support shaft (36) is coaxially rotatably connected to the support frame (35), and the other end is coaxially rotatably connected to the wind cover (30), the impeller (37) is coaxially fixedly connected to the support shaft (36), and the power output end of the blower mechanism is drivingly connected to the support shaft (36).

3. The explosion-proof electrical switch for underground coal mines according to claim 2, characterized in that: The monitoring mechanism further comprises a monitoring plate (19) fixedly arranged at the bottom of the explosion-proof cabinet (3), a transfer tube (20) fixedly arranged below the explosion-proof cabinet (3), and a piston rod (21) coaxially elastically slidably arranged in the transfer tube (20); a cavity is provided in the monitoring plate (19); a hose is provided between the transfer tube (20) and the monitoring plate (19); one end of the hose is connected to the cavity inside the monitoring plate (19), and the other end is connected to the transfer tube (20); the piston rod (21) is dynamically sealed to the inner wall of the transfer tube (20); the piston rod (21) is a monitoring output end of the monitoring mechanism, and the piston rod (21) is connected to the speed increasing output end.

4. The explosion-proof electrical switch for underground coal mines according to claim 3, characterized in that: The speed increasing mechanism further comprises a driving motor (39) fixedly arranged below the explosion-proof cabinet (3), two bearing support plates (14) fixedly arranged symmetrically at the bottom of the explosion-proof cabinet (3), a transmission rod (15) rotatably arranged on the bearing support plates (14), two support frames (24) fixedly arranged symmetrically beside the transmission rod (15), a conical tube (25) rotatably arranged on the support frames (24), and a transmission wheel (17) coaxially arranged on the transmission rod (15), wherein at least two limiting grooves (16) are formed in an annular shape on the side wall of the transmission rod (15), and the transmission wheel (17) A limiting protrusion matching the size of the limiting groove (16) is formed on the inner wall, the transmission wheel (17) is connected to the piston rod (21), the transmission wheel (17) is in conflict with the tapered tube (25), the transmission rod (15) is connected to the load-bearing shaft (36) through a pulley and a bevel gear group, the central axis of the tapered tube (25) is coaxially fixedly connected to the power shaft of the drive motor (39), the power shaft of the drive motor (39) is the power output end of the blower mechanism, the transmission rod (15) is the speed increasing output end of the speed increasing mechanism, and the generatrix of the tapered tube (25) is parallel to the axis of the transmission rod (15).

5. The explosion-proof electrical switch for underground coal mines according to claim 4, characterized in that: The speed increasing mechanism further comprises a limit support plate (7) fixedly arranged at the bottom of the explosion-proof cabinet (3) in a symmetrical state, a threaded rod (8) rotatably arranged on the limit support plate (7), a sliding support (10) coaxially arranged on the threaded rod (8), and a U-shaped frame (18) fixedly arranged on the sliding support (10), the threaded rod (8) being transmission-connected to the piston rod (21), the sliding support (10) being threadedly connected to the threaded rod (8), and the transmission wheel (17) being rotationally arranged on the U-shaped frame (18) via an axle seat.

6. The explosion-proof electrical switch for underground coal mines according to claim 5, characterized in that: The speed increasing mechanism further comprises a worm wheel (9) coaxially fixedly arranged on the threaded rod (8), a limit seat (11) fixedly arranged on a limit support plate (7) close to the worm wheel (9), a worm (12) rotatably arranged on the limit seat (11), a transmission gear (13) coaxially fixedly arranged on the worm (12), and a transmission rack (22) fixedly arranged on the piston rod (21), the transmission rack (22) meshing with the transmission gear (13), and the worm (12) meshing with the worm wheel (9).

7. The explosion-proof electrical switch for underground coal mines according to claim 6, characterized in that: A wedge-shaped bar (23) is fixedly arranged on the transfer tube (20), a wedge-shaped groove is provided on the transmission rack (22), and the wedge-shaped bar (23) is slidably matched with the wedge-shaped groove.

8. The explosion-proof electrical switch for underground coal mines according to claim 7, characterized in that: The hair dryer mechanism also includes a protective frame (2) fixedly arranged below the machine base (1), a rotating ring (33) rotatably arranged on the transfer tube (29), a connecting ring (31) rotatably arranged on the wind cover (30), a passive magnetic ring (32) fixedly arranged in the connecting ring (31), an active magnetic ring (38) coaxially fixedly arranged on the bearing shaft (36), and a cleaning rod (34) arranged on the rotating ring (33), wherein one end of the cleaning rod (34) is fixedly connected to the rotating ring (33), and the other end is fixedly connected to the connecting ring (31).

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