Mining flame-proof and intrinsically safe vacuum electromagnetic starter

Abstract

The utility model provides a mining flame-proof and intrinsically safe vacuum electromagnetic starter, and belongs to the technical field of starters. The technical problem to be solved is to provide the improvement of the hardware structure of the mining flame-proof and intrinsically safe vacuum electromagnetic starter. Comprising an explosion-proof shell divided into an upper cavity and a lower cavity, the upper cavity is a wiring cavity, the lower cavity is a main cavity, a body assembly is installed in the main cavity, a door cover is installed on the front face of the main cavity, and the door cover is connected with the explosion-proof shell through a quick door opening mechanism. The body assembly comprises a protector, a transformer, an isolation knife switch, an isolation change-over switch, a vacuum contactor, a power conversion board, a relay, a fuse and an intrinsic safety pilot module. A reversing switch handle and an isolation switch operating handle are installed on the right side face of the main cavity, mechanical interlocking is achieved between the reversing switch handle and the isolation switch operating handle through a reversing interlocking mechanism, and mechanical interlocking is achieved between the isolation switch operating handle and the door cover through a door opening interlocking mechanism. The utility model is applied to starters.

Description

Technical Field

[0001] The utility model provides a mine flameproof and intrinsically safe vacuum electromagnetic starter, belonging to the technical field of starters. Background Technique

[0002] The QJZ-1140(660, 380) series of mine flameproof and intrinsically safe vacuum electromagnetic starters (hereinafter referred to as starters) are applicable to mines with explosive dangerous gases (methane) and coal dust. It can control the direct starting and stopping of three-phase squirrel-cage asynchronous motors with a rated current up to 80A in a power supply system with an alternating current of 50Hz and a rated voltage of 1140V, 660V or 380V, and at the same time protect the motors and related circuits.

[0003] However, the existing starters still have the following defects:

[0004] 1) Different devices are connected through different interfaces, and it is difficult for different devices to interact;

[0005] 2) There is no acquisition of the start / stop parameters of the water pump motor, resulting in the start / stop of the water pump motor still needing to be regulated by the parameters of the upper computer and unable to directly control its start / stop through the water level;

[0006] 3) The isolating reversing switch inside the housing is set separately and not interlocked with the isolating knife switch, resulting in potential safety hazards during its operation. Content of the Utility Model

[0007] In order to overcome the deficiencies in the prior art, the technical problem to be solved by the utility model is to provide an improvement in the hardware structure of a mine flameproof and intrinsically safe vacuum electromagnetic starter.

[0008] To solve the above technical problem, the technical solution adopted by the utility model is: a mine flameproof and intrinsically safe vacuum electromagnetic starter, including a flameproof housing divided into an upper and a lower cavity structure, wherein the upper cavity is a wiring cavity, a cable connector is installed on the side of the wiring cavity, the lower cavity is the main cavity, a body component is installed in the main cavity, a door cover is installed on the front of the main cavity, and the door cover is connected to the explosion-proof housing through a quick-opening mechanism. The body component includes a protector, a transformer, an isolating knife switch, an isolating reversing switch, a vacuum contactor, a power conversion board, a relay, a fuse and an intrinsically safe pilot module installed on a movement support. The output end of the transformer is connected to the power supply ends of the protector, the vacuum relay and the intrinsically safe pilot module. The isolating knife switch is connected between the power supply incoming line end of the main circuit and the cable connector of the input power supply. The isolating reversing switch is connected to the power supply outgoing line end of the isolating knife switch;

[0009] A display, a door button assembly and a knob combination switch assembly are arranged on the front of the door cover;

[0010] On the right side of the main cavity, a commutation switch handle, an isolating switch operating handle, and a stop button are installed. A mechanical interlock is achieved between the commutation switch handle and the isolating switch operating handle through a commutation interlock mechanism. The isolating switch operating handle is also mechanically interlocked with the door cover through a door-opening interlock mechanism. The stop button is located in front of the stop switch inside the main cavity. The stop switch is connected to the power supply terminal of the vacuum contactor through a wire. A mechanical interlock mechanism is provided between the commutation switch handle and the stop button to achieve electrical interlock between the isolating commutation switch and the vacuum relay.

[0011] The protector integrates a control circuit board, which is developed based on the MineHong operating system, providing a unified interface and a unified data format.

[0012] The protector is provided with multiple analog interfaces, digital input / output interfaces, serial ports, Ethernet interfaces, Wi-Fi interfaces, and Bluetooth interfaces.

[0013] The protector can be externally connected to a liquid level sensor to achieve the functions of local control, remote control, and water level control in three control modes.

[0014] The isolating switch operating handle includes an isolating switch rotating shaft connected to the isolating switch switch body. A shaft sleeve is sleeved outside the isolating switch rotating shaft. The isolating switch rotating shaft is connected to the isolating switch operating handle seat through a tapered pin. A handle rod is fixed on the isolating switch operating handle seat. Two holes are also opened on the isolating switch operating handle seat. One is the door-opening hole for cooperating with the door-opening interlock mechanism, and the other is the commutation hole for cooperating with the commutation interlock mechanism.

[0015] The door-opening interlock mechanism includes an interlock rod, an interlock rod seat, and an interlock plate. The interlock rod seat is fixed on the right-side shell of the main cavity, and the interlock plate is installed on the right side of the door cover. Holes for the interlock rod to pass through are opened at both ends of the interlock rod seat. Holes for the interlock rod to be inserted and withdrawn are provided on the interlock plate. A lock hole is opened on the interlock rod. After the door cover is closed, the interlock rod is inserted into the interlock plate. After the door cover is opened, the interlock rod is inserted into the door-opening hole of the isolating switch operating handle seat, making the isolating switch operating handle unable to operate.

[0016] The commutation switch handle includes a commutation switch rotating shaft, which is installed in the commutation switch base. The commutation switch base is fixed on the left-side shell of the main cavity. The commutation switch rotating shaft is connected to the isolating commutation switch body. The other end of the commutation switch rotating shaft is fixedly connected to the commutation switch handle seat. An operating handle is connected to the commutation switch handle seat. A handle groove for cooperating with the commutation interlock mechanism is opened on the commutation switch handle seat.

[0017] The commutation interlock mechanism includes a screw, an interlock piece, a lock rod spring and a sheath. The interlock piece penetrates through the base of the commutation switch. In the off state of the isolating commutation switch, the interlock piece is inserted into the handle groove on the handle seat of the commutation switch. A lock rod spring is sleeved on the interlock piece, and a sheath is sleeved outside the lock rod spring. A moving groove is provided on the sheath. A screw is fixed on the interlock piece. The screw can drive the interlock piece to move up and down within the opening distance of the moving groove of the sheath, so that the interlock piece is disengaged from or inserted into the handle groove on the handle seat of the commutation switch, and the interlock piece is limited in position.

[0018] The stop button includes a stop button seat fixed on the isolating housing. A stop button rod is installed in the stop button seat. A stop button spring is sleeved on the stop button rod. The inner end of the stop button rod is fixedly connected with a striker through a fastener. A commutation switch limit plate is installed on the side of the striker. The commutation switch limit plate is fixedly connected with the handle of the commutation switch.

[0019] The commutation switch limit plate is a horizontal rotating plate. The movable end of the rotating plate is a trapezoid with a circular arc notch on its surface. The circular arc notch matches the striker. When the stop button is in its original position, the circular arc notch of the commutation switch limit plate is clamped with the striker, so that the handle of the commutation switch cannot rotate. When the stop button is pressed, the striker presses the stop switch, and the circular arc notch of the commutation switch limit plate is separated from the striker, and the handle of the commutation switch can rotate.

[0020] An isolating opening / closing observation window is provided on the left side surface of the door cover.

[0021] The beneficial effects of the present utility model compared with the prior art are as follows: By providing an isolating knife switch and arranging an interlock mechanism between the isolating knife switch and the isolating commutation switch, it is ensured that the isolating commutation switch cannot rotate after the cover is opened, ensuring the safety of operation. At the same time, by setting a mechanical interlock between the isolating knife switch and the door cover, it is ensured that the isolating knife switch cannot be closed after the cover is opened. At the same time, by adopting the MineHong operating system and the MineHong soft bus, the unity of the interfaces is ensured, and the interaction between different devices is realized. Description of the Drawings

[0022] The following further describes the present utility model with reference to the drawings:

[0023] Figure 1 Structural schematic of the present utility model Figure 1 ;

[0024] Figure 2 Structural schematic of the present utility model Figure 2 ;

[0025] Figure 3 Structural schematic of the present utility model with the door cover opened Figure 1 ;

[0026] Figure 4 Structural schematic of the door cover opening of the present utility model Figure 2 ;

[0027] Figure 5 Front view of the present utility model;

[0028] Figure 6 Right view of the present utility model;

[0029] Figure 7 Left view of the present utility model;

[0030] Figure 8 is Figure 6 Cross-sectional view A-A in

[0031] Figure 9 Structural schematic of the body assembly of the present utility model;

[0032] Figure 10 Structural schematic of the present utility model with the side plates removed;

[0033] Figure 11 is Figure 5 Cross-sectional view B-B in

[0034] Figure 12 Cross-sectional view of the stop button part;

[0035] In the figure: 1 is the door cover, 2 is the explosion-proof enclosure, 3 is the door-opening interlock mechanism, 4 is the commutation interlock mechanism, 5 is the commutation switch handle, 6 is the isolating knife switch operating handle, 7 is the wiring chamber, 8 is the cable connector, 9 is the isolating switch on / off observation window, 10 is the quick-opening door mechanism, 11 is the door button assembly, 12 is the knob combination switch assembly, 13 is the body assembly, 14 is the support, 15 is the screw, 16 is the isolating knife switch rotating shaft, 17 is the bushing, 18 is the isolating knife switch operating handle seat, 19 is the handle rod, 20 is the tapered pin, 21 is the commutation switch base, 22 is the interlock part, 23 is the lock rod spring, 24 is the sheath, 25 is the commutation switch handle seat, 26 is the commutation switch shaft, 27 is the interlock rod, 28 is the interlock rod seat, 29 is the interlock plate, 30 is the protector, 31 is the transformer, 32 is the isolating knife switch, 33 is the isolating commutation switch, 34 is the vacuum contactor, 35 is the power conversion board, 36 is the relay, 37 is the fuse, 38 is the stop button, 39 is the commutation switch limit plate, 40 is the limit post, 41 is the fastener, 42 is the striker, 43 is the stop button sleeve, 44 is the stop button spring, 45 is the stop button seat, 46 is the stop button rod, 47 is the stop switch. Detailed implementation mode

[0036] As Figures 1 to 12As shown in the figure, the utility model provides a mine flameproof and intrinsically safe vacuum electromagnetic starter, which includes a flameproof enclosure 2 installed on a skid 14. The flameproof enclosure 2 can be a rectangular shell and is divided into upper and lower cavities. The upper cavity is a wiring cavity 7, and cable connectors 8 are installed on the sides of the wiring cavity 7. The cable connectors 8 adopt quick-insert cable connection and introduction devices. The lower cavity is the main cavity, and a body assembly 13 is installed in the main cavity. The body assembly 13 is installed on a movement support bracket, and the movement support bracket can be pulled out along a guide rail installed on the bottom plate of the main cavity, facilitating installation and maintenance.

[0037] The body assembly 13 includes a protector 30, a transformer 31, an isolating knife switch 32, an isolating reversing switch 33, a vacuum contactor 34, a power conversion board 35, a relay 36, a fuse 37 and an intrinsically safe pilot module integrated together. The protector 30 is used to control the vacuum electromagnetic starter. The power conversion board 35 is connected to the output end of the transformer 31 and is used to convert the power output by the transformer 31 into power available for the protector 30, the vacuum contactor 34 and the intrinsically safe pilot module. The relay 36 is used to control the action of the vacuum contactor 34, and the fuse 37 is used to limit the voltage and current of the main circuit.

[0038] A door cover 1 is installed on the front of the main cavity. The door cover 1 is connected to the explosion-proof enclosure 2 by a quick-opening mechanism 10. A display, a door button assembly 11 and a knob combination switch assembly 12 are arranged on the front of the door cover 1. The door button assembly 11 includes start, stop, overload, leakage test, up, down, confirm and reset buttons.

[0039] A reversing switch handle 5 and an isolating knife switch operating handle 6 are installed on the right side of the main cavity. A mechanical interlock is achieved between the reversing switch handle 5 and the isolating knife switch operating handle 6 through a reversing interlock mechanism 4, and the isolating knife switch operating handle 6 is also mechanically interlocked with the door cover 1 through a door-opening interlock mechanism 3, ensuring that the door cover 1 cannot be opened when the isolating knife switch 32 and the isolating reversing switch 33 are closed; when the door cover 1 is opened, the isolating knife switch 32 and the isolating reversing switch 33 cannot be closed.

[0040] The isolating knife switch operating handle 6 includes an isolating knife switch rotating shaft 16 connected to the main body of the isolating knife switch 32. A shaft sleeve 17 is sleeved outside the isolating knife switch rotating shaft 16. The isolating knife switch rotating shaft 16 is connected to an isolating knife switch operating handle seat 18 through a tapered pin 20. A handle rod 19 is fixed on the isolating knife switch operating handle seat 18. The isolating knife switch operating handle seat 18 can be rotated by operating the handle rod 19, thereby driving the isolating knife switch rotating shaft 16 to rotate, and the isolating knife switch rotating shaft 16 drives the isolating knife switch 32 to act. Two holes are also opened on the isolating knife switch operating handle seat 18. One is a door-opening hole for cooperating with the door-opening interlock mechanism 3, and the other is a reversing hole for cooperating with the reversing interlock mechanism 4.

[0041] The reversing switch handle 5 includes a reversing switch shaft 26. The reversing switch shaft 26 is installed in the reversing switch base 21. The reversing switch base 21 is fixed on the left side housing of the main cavity. The reversing switch shaft 26 is connected to the body of the isolating reversing switch 33. The other end of the reversing switch shaft 26 is fixedly connected to the reversing switch handle seat 25. An operating handle is connected to the reversing switch handle seat 25. And a handle groove for cooperating with the reversing interlocking mechanism 4 is provided on the reversing switch handle seat 25.

[0042] The reversing interlocking mechanism 4 includes a screw 15, an interlocking part 22, a locking rod spring 23 and a sheath 24. The interlocking part 22 passes through the reversing switch base 21. In the off state of the isolating reversing switch 33, the interlocking part 22 is inserted into the handle groove on the reversing switch handle seat 25. And a locking rod spring 23 is sleeved on the interlocking part 21. A sheath 24 is sleeved outside the locking rod spring 23. And a U-shaped groove opening to the right is provided on the sheath 24. The vertical section of the U-shaped groove is the distance that the screw 15 can drive the interlocking part 22 to move up and down. The horizontal section of the U-shaped groove is the distance that the isolating knife switch handle 6 can rotate. And the horizontal section of the U-shaped groove can also ensure that the interlocking part 22 will not fall off when inserted into the reversing hole of the isolating knife switch operating handle seat 18, forming a limit for the interlocking part 22. A screw 15 is fixed on the interlocking part 22. The screw 15 can drive the interlocking part 22 to move up and down within the vertical distance of the U-shaped groove of the sheath 24, so that the interlocking part 22 can be disengaged from or inserted into the handle groove on the reversing switch handle seat 25.

[0043] The reversing switch handle 5 has three positions: forward, off and reverse. The electrical interlock between the isolating reversing switch 33 and the vacuum contactor 34 is realized through the interlock between the stop button 38 and the reversing switch handle 5. If the isolating reversing switch 33 is to be turned, the stop button 38 must be pressed first, otherwise the isolating reversing switch 33 cannot rotate. This can avoid the isolating reversing switch 33 from being disconnected under load. However, in an emergency, such as when the contactor contacts are stuck together, the isolating reversing switch 33 is allowed to cut off the power supply under load.

[0044] Among them, the stop button 38 is installed in front of the stop switch 47. The stop switch 47 is connected to the power supply terminal of the vacuum contactor 34 through a wire, and can control the start and stop of the vacuum contactor 34. The stop button 38 includes a stop button seat 45 fixed on the housing. A stop button rod 46 is installed in the stop button seat 45. A stop button spring 44 is sleeved on the stop button rod 46. One inner end of the stop button rod 46 is fixedly connected with a striker 42 through a fastener 41. When the stop button 38 is pressed, the striker 42 can be extended to press the stop switch 47, disconnecting the power supply of the vacuum contactor 34. At the same time, a commutation switch limit plate 39 is installed on the side of the striker 42. The commutation switch limit plate 39 is fixedly connected with the commutation switch handle 5. Rotating the commutation switch handle 5 can drive the commutation switch limit plate 39 to rotate. The commutation switch limit plate 39 is a horizontal rotating plate. The movable end of the rotating plate is a trapezoid with an arc-shaped notch on the surface. The arc-shaped notch matches the striker 42. When the stop button 38 is in its original position, the arc-shaped notch of the commutation switch limit plate 39 just engages with the striker 42, making the commutation switch handle 5 unable to rotate. When the stop button rod 46 is pressed, it will drive the striker 42 to extend and press the stop switch 47. The arc-shaped notch of the commutation switch limit plate 39 is no longer restricted, and at this time the commutation switch handle 5 can rotate. At the same time, limit posts 40 are respectively arranged above and below the commutation switch limit plate 39. Through the arrangement of the limit posts 40, it can be prevented that the rotation angle of the isolating commutation switch 33 is too large, thereby damaging the isolating commutation switch 33.

[0045] The door opening interlock mechanism 3 includes an interlock rod 27, an interlock rod seat 28 and an interlock plate 29. Among them, the interlock rod seat 28 is fixed on the right-side housing of the main cavity. The interlock plate 29 is installed on the right side of the door cover 1. The interlock rod seat 28 is a concave structure. The plane of the interlock rod seat 28 is fixed on the housing. Holes for the interlock rod 27 to pass through are opened at both ends of the interlock rod seat 28. Threaded holes for the interlock rod 27 to be inserted and withdrawn are provided on the interlock plate 29, and a lock hole is also opened on the interlock rod 27; after the door cover 1 is closed, the interlock rod 27 is inserted into the interlock plate 29 and screwed. At this time, the lock hole is located in the middle of the interlock rod seat 28 and is locked by the responsible operator. After locking, the interlock rod 27 cannot be moved randomly, ensuring that the door cover 1 cannot be directly opened when it is energized. After the door cover 1 is opened, the interlock rod 27 is withdrawn from the interlock plate 29 and then inserted into the door opening hole of the isolating knife switch operating handle seat 18, making the isolating knife switch operating handle 6 unable to act. At this time, the lock hole is located outside the interlock rod seat 28 and is locked by the responsible operator. At this time, the interlock rod 27 cannot be moved randomly, ensuring that the isolating knife switch 32 and the isolating commutation switch 33 cannot be closed after the door is opened.

[0046] An isolating switch on-off observation window 9 is provided on the left-side housing of the door cover 1. Through the isolating switch on-off observation window 9, the on-off actions of the isolating knife switch 32 and the isolating commutation switch 33 can be viewed.

[0047] The operating principle of the present utility model is as follows:

[0048] Before the starter runs, close the door cover 1, insert the interlock lever 27 into the interlock plate 29. At this time, the isolating commutation switch 33 is in the stop position. Rotate the isolating knife switch operating handle 6 to turn the isolating knife switch 32 from the off position to the on position. At this time, the commutation hole on the isolating knife switch operating handle seat 18 turns to directly above the interlock part 22. Then push the screw 15 to disengage the interlock part 22 from the slot on the commutation switch handle seat 25, insert the interlock part 22 into the commutation hole on the isolating knife switch operating handle seat 18, and then rotate the commutation switch handle 6 to make it in the forward or reverse position; when it is necessary to disconnect the equipment, first press the stop button 38, and then rotate the commutation switch handle 6 to turn it back to the stop position. At this time, the handle slot on the commutation switch handle seat 25 is directly below the interlock part 22. Due to the action of the lock lever spring 23, the interlock part 22 will pop out of the commutation hole on the isolating knife switch operating handle seat 18 and then extend into the handle slot on the commutation switch handle seat 25. Then rotate the isolating knife switch operating handle 6 to turn it to the off position, and the break state of the isolating knife switch 32 can be observed from the circular isolating closing-opening observation window 9 on the right side of the device.

[0049] A visible safety isolation break is provided between the main circuit power input and output of the starter of the present utility model. The safety isolation break is achieved by means of air isolation. When the break is opened, the distance needs to be greater than 20 mm to ensure the safety effect. An isolating closing-opening observation window 9 is provided on the outer shell of the starter, which can conveniently and clearly observe the state of the safety isolation break.

[0050] The display of the present utility model adopts a PLC touch screen all-in-one machine, which can display in Chinese with a touch color screen, and uses a combination of pictures and texts to simulate the actual on-site working conditions, and displays the operating parameters and fault signals in liquid crystal Chinese characters. When running, it displays the current time, three-phase current, grid voltage, active power, power factor, insulation resistance, operating state (closing / opening), and fault information. It has the functions of fault self-diagnosis and memory, and stores no less than 50 fault messages. The PLC touch screen all-in-one machine can be connected to no less than 12 switch quantity inputs, 8 switch quantity outputs, and 7 analog quantity input signals, and reserves expandable functions.

[0051] The protector 30 of the present utility model can access analog quantity signals such as pressure, flow, liquid level, etc. and switch quantity signals such as float switches, and collect the data into the PLC for logical judgment. According to the collected liquid level signal, it can automatically control the start and stop of the water pump, and can judge the water pump pipeline condition according to the flow and pressure. Its specific functions are as follows:

[0052] 1. Protector 30 is developed based on the MineHarmony operating system, providing a unified interface, unified data format, and simplified interconnection. The equipment can achieve heterogeneous networking through the MineHarmony soft bus technology, which can well solve the problem of how different protocols between devices interact. At the same time, it realizes the transformation of fixed button operation to mobile phone operation, greatly improving the efficiency of equipment management and inspection.

[0053] 2. Interface: dual serial ports, serial port 1: RS485, serial port 2: RS485; one Ethernet, one WiFi, one Bluetooth, support USB keyboard, support key control.

[0054] 2.1. RS485 communication adopts the standard Modbus RTU communication protocol format, and Ethernet and wifi adopt ModbusTCP protocol format, which is convenient for networking and communication mode selection, and realizes remote adjustment, remote signal, remote measurement, remote control, remote pulse and remote test.

[0055] 2.2. Support power carrier communication technology, realize communication networking function through power cable, do not need to lay communication cables, reduce engineering workload, shorten construction period, save costs, and realize communication wherever there is electricity.

[0056] 3. It has infrared intelligent remote control function to realize the setting of switch parameters.

[0057] 4. Temperature and humidity alarm: The protector 30 comes with a temperature and humidity sensor to monitor the cavity temperature and humidity in real time, which can be used to alarm when exceeding the limit value;

[0058] 5. Over-temperature protection: Support external PT100 temperature sensor, set according to the working limit temperature of the motor, and when the temperature reaches the limit, the comprehensive protection will alarm and stop running;

[0059] 6. Water flow protection: An external water flow sensor can be connected. When the water pump motor is started, if no water flow is detected within the set value of the "water flow protection time", a signal will be sent for tripping or alarming.

[0060] 7. Water pressure protection: supports 4-20mA analog sensor access, and can set low pressure and high pressure limits for alarm and tripping;

[0061] 8. Support statistical functions such as electricity metering, cumulative operating time, closing times, etc.;

[0062] 9. Support electronic signboard function: set the maintenance password, the protector 30 enters the maintenance state and prohibits all operations, and enter the password again to release the maintenance state;

[0063] 10. Wind power and gas interlock: The wind power and gas interlock is a normally open or normally closed empty contact connected to the access protector 30. The protector 30 can set the "wind power and gas normally closed" control word selection and can trip after a delay. The delay time is generally set to 0.50 - 10.00 seconds.

[0064] 11. It has three control mode functions: local control, remote control (button / network control), and water level control. The water level mode can select a three-wire liquid level sensor or a 4 - 20mA analog sensor for access, providing multiple solutions for the automatic start and stop of the water level at the drainage point.

[0065] When set to the local mode, the SA changeover switch on the door cover 1 is used to select the local control and remote control, and the local control and remote control buttons are operated for opening and closing control. Water level and network closing control are prohibited. Network opening control is allowed.

[0066] When set to the network control mode, the SA changeover switch on the door cover 1 selects the remote control. The network control mode supports network opening and closing control. Water level and local button closing control are prohibited, and local button opening control is allowed.

[0067] When set to the water level mode, opening and closing control is performed according to the high / low water level signal. Network and local button closing control are prohibited, and network and local button opening control are allowed. Among them, starting when the water level is high means that when the water level is detected as high by the liquid level sensor, the motor automatically starts to operate for drainage. Stopping when the water level is low means that when the water level is detected as low by the liquid level sensor, the motor automatically stops running to stop drainage.

[0068] The working principle of the present utility model is as follows:

[0069] Power on: Close the isolating knife switch 32 in place, and close the isolating reversing switch 33 in the forward or reverse direction. At this time, the transformer 31 is powered on, and two groups of power supplies of 33V and 36V are output. The 33V power supply is supplied to the protector 30 for use, and the 36V power supply is supplied to the KM of the vacuum contactor 34 and provides power for the intrinsically safe pilot module. After the protector 30 is powered on, it first performs self-check, and the starter circuit enters the waiting start state. Then, according to different control requirements, select the remote control, local control, or water level control mode, and perform the corresponding control operations.

[0070] Regarding the specific structure of the present utility model, it should be noted that the connection relationships between the various component modules adopted by the present utility model are definite and achievable. Except for the special descriptions in the embodiments, the specific connection relationships can bring corresponding technical effects, and on the premise of not relying on the execution of corresponding software programs, the technical problems proposed by the present utility model can be solved. The models of the components, modules, and specific components, the connection methods between each other, and the conventional usage methods and predictable technical effects brought by the above technical features, except for the specific descriptions, all belong to the publicly disclosed content in patents, journal papers, technical manuals, technical dictionaries, and textbooks that those skilled in the art can obtain before the application date, or belong to the prior art such as conventional technologies and common general knowledge in the art, and there is no need to elaborate. This makes the technical solution provided in this case clear, complete, and achievable, and the corresponding physical product can be reproduced or obtained according to this technical means.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, and not to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A mine flameproof and intrinsically safe vacuum electromagnetic starter, comprising a flameproof enclosure with an upper and lower cavity structure, wherein the upper cavity is a wiring cavity, a cable connector is installed on the side of the wiring cavity, the lower cavity is the main cavity, a body assembly is installed in the main cavity, a door cover is installed on the front of the main cavity, and the door cover is connected to the explosion-proof enclosure through a quick-opening mechanism, and is characterized in that: The body component includes a protector, a transformer, an isolating knife switch, an isolating reversing switch, a vacuum contactor, a power conversion board, a relay, a fuse, and an intrinsically safe pilot module installed on the movement bracket. The output end of the transformer is connected to the power supply ends of the protector, the vacuum relay, and the intrinsically safe pilot module. The isolating knife switch is connected between the power supply incoming line end of the main circuit and the cable connector of the input power supply. The isolating reversing switch is connected to the power supply outgoing line end of the isolating knife switch. A display, a door button assembly, and a knob combination switch assembly are provided on the front surface of the door cover. A reversing switch handle, an isolating knife switch operating handle, and a stop button are installed on the right side surface of the main cavity. A mechanical interlock is achieved between the reversing switch handle and the isolating knife switch operating handle through a reversing interlock mechanism. The isolating knife switch operating handle is also mechanically interlocked with the door cover through a door-opening interlock mechanism. The stop button is located in front of the stop switch inside the main cavity. The stop switch is connected to the power supply end of the vacuum contactor through a wire. A mechanical interlock mechanism is provided between the reversing switch handle and the stop button to achieve an electrical interlock between the isolating reversing switch and the vacuum relay.

2. The mining flameproof and intrinsically safe vacuum electromagnetic starter according to claim 1, characterized in that: A control circuit board is integrated in the protector. The control circuit board is developed based on the Kuanghong operating system, providing a unified interface and a unified data format.

3. The mining flameproof and intrinsically safe vacuum electromagnetic starter according to claim 2, wherein: Multiple analog quantity interfaces, switch quantity interfaces, serial ports, Ethernet interfaces, wifi interfaces, and Bluetooth interfaces are provided on the protector.

4. A mining flameproof and intrinsically safe vacuum electromagnetic starter according to claim 3, characterized in that: The protector can be externally connected to a liquid level sensor to achieve the functions of local control, remote control, and water level control modes.

5. A mining flameproof and intrinsically safe vacuum electromagnetic starter according to claim 1, characterized in that: The isolating knife switch operating handle includes an isolating knife switch rotating shaft connected to the isolating knife switch body. A bushing is sleeved outside the isolating knife switch rotating shaft. The isolating knife switch rotating shaft is connected to the isolating knife switch operating handle seat through a tapered pin. A handle rod is fixed on the isolating knife switch operating handle seat. Two holes are also opened on the isolating knife switch operating handle seat. One is a door-opening hole for cooperating with the door-opening interlock mechanism, and the other is a reversing hole for cooperating with the reversing interlock mechanism.

6. The mining flameproof and intrinsically safe vacuum electromagnetic starter according to claim 5, characterized in that: The door-opening interlock mechanism includes an interlock rod, an interlock rod seat, and an interlock plate. The interlock rod seat is fixed on the right side shell of the main cavity, and the interlock plate is installed on the right side surface of the door cover. Holes for the interlock rod to pass through are opened at both ends of the interlock rod seat. Holes for the interlock rod to insert and withdraw are provided on the interlock plate. A lock hole is opened on the interlock rod. After the door cover is closed, the interlock rod is inserted into the interlock plate. After the door cover is opened, the interlock rod is inserted into the door-opening hole of the isolating knife switch operating handle seat, making the isolating knife switch operating handle unable to act.

7. A mining flameproof and intrinsically safe vacuum electromagnetic starter according to claim 5, characterized in that: The reversing switch handle includes a reversing switch rotating shaft installed in the reversing switch base. The reversing switch base is fixed on the left side shell of the main cavity. The reversing switch rotating shaft is connected to the isolating reversing switch body. The other end of the reversing switch rotating shaft is fixedly connected to the reversing switch handle seat. An operating handle is connected to the reversing switch handle seat. A handle groove for cooperating with the reversing interlock mechanism is opened on the reversing switch handle seat.

8. The mining flameproof and intrinsically safe vacuum electromagnetic starter according to claim 7, characterized in that: The commutation interlock mechanism includes a screw, an interlock member, a lock rod spring, and a sheath. The interlock member penetrates through the base of the commutation switch. In the off state of the isolating commutation switch, the interlock member is inserted into the handle groove on the handle seat of the commutation switch. A lock rod spring is sleeved on the interlock member, and a sheath is sleeved outside the lock rod spring. A moving groove is provided on the sheath. A screw is fixed on the interlock member, and the screw can drive the interlock member to move up and down within the opening distance of the moving groove of the sheath, so that the interlock member is disengaged from or inserted into the handle groove on the handle seat of the commutation switch, and the interlock member is limited in position.

9. The mining flameproof and intrinsically safe vacuum electromagnetic starter according to claim 8, characterized in that: The stop button includes a stop button seat fixed on the isolating housing. A stop button rod is installed in the stop button seat. A stop button spring is sleeved on the stop button rod. One inner end of the stop button rod is fixedly connected with a striker through a fastener. A commutation switch limit plate is installed on the side surface of the striker, and the commutation switch limit plate is fixedly connected with the commutation switch handle. The commutation switch limit plate is a horizontal rotating plate. The movable end of the rotating plate is a trapezoid with a circular arc notch on the surface. The circular arc notch matches the striker. When the stop button is in the original position, the circular arc notch of the commutation switch limit plate is clamped with the striker, so that the commutation switch handle cannot rotate. When the stop button is pressed, the striker presses the stop switch, and the circular arc notch of the commutation switch limit plate is separated from the striker, and the commutation switch handle can rotate.

10. A mining flameproof and intrinsically safe vacuum electromagnetic starter according to any one of claims 1-9, characterized in that: An isolating opening / closing observation window is provided on the left side surface of the door cover.

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