Mining explosion-proof combined frequency converter

Abstract

A mining explosion-proof combined frequency converter belongs to the technical field of frequency converters and comprises a frequency converter body, a wireless remote control circuit, a wireless receiving circuit, an adjusting structure and a combustible gas detection circuit. The frequency converter body, the combustible gas detection module and the wireless receiving circuit are installed in the electric control box and electrically connected, the adjusting mechanism comprises a motor speed reducing mechanism and a supporting frame, the number of gear boxes of the motor speed reducing mechanism is two, and the two gear boxes are installed outside the front end and the rear end of the shell respectively; the side end of a shell of the motor and the front side of the supporting frame are installed together, the rear side of the supporting frame is installed at the front end of a shell of the frequency converter body, and a rear-end gearbox power output shaft is installed at the outer side end of an adjusting handle of the frequency converter body. According to the utility model, when gas leakage occurs on site, the alarm can timely give out sound to prompt nearby workers to pay attention to safety and evacuate from the site, and power supplies of the frequency converter body and the motor can be automatically turned off, so that the probability of serious explosion consequences caused by electric sparks generated by the motor due to various reasons is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of frequency converter equipment, in particular to a flameproof combined frequency converter for mining. Background Art

[0002] Frequency converters (VFDs) are widely used to control motors, offering advantages such as energy savings, reduced noise and vibration, improved safety and reliability, and reduced maintenance costs. In practice, VFDs used to control mining motors gradually increase their output frequency during the motor's startup phase, ensuring a smooth start. This prevents the impact of the high starting current on the power grid and motor itself caused by a full-speed start, thus protecting the motor and the grid from damage. Specifically, before and after starting the motor, personnel manually adjust the VFD's adjustment knob to control the frequency of the VFD's output to the motor's power input, thereby simultaneously controlling the motor's speed.

[0003] While existing inverters meet the starting and operating control needs of mining motors, they still present some technical issues due to structural limitations. Specifically, the operating environment of mining motors is relatively complex. If a gas leak occurs in the relevant area and workers fail to promptly detect it, or if sparks are generated when the motor is started or during operation, there is a chance that the sparks (such as those caused by electrical breakdown, arcing, corona discharge, static electricity, etc.) will ignite the gas, causing a serious accident. Furthermore, existing mining motors require workers to manually operate the inverter's adjustment handle near the electrical control box to adjust the inverter's output frequency. This is extremely inconvenient when other equipment is temporarily placed on the ground in front of the electrical control box. Therefore, it is particularly necessary to provide an inverter with improved safety and ease of operation. Utility Model Content

[0004] In order to overcome the drawbacks of the existing inverters used in mining motors due to structural limitations as described in the background, the utility model provides an inverter body, etc., under the joint action of relevant mechanisms, the staff can wirelessly adjust the output power frequency of the inverter body, which brings convenience to the staff. During work, it can detect in real time whether there is gas leakage in the relevant area, and can promptly remind nearby staff when a gas leakage occurs on site, and can disconnect the power supply of the motor, making the motor unable to start and stop moving during rotation, thereby reducing the risk of electric sparks generated by the motor due to various reasons, leading to serious explosion consequences, etc.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] The explosion-proof combined inverter for mining includes an inverter body, a wireless remote control circuit, a wireless receiving circuit, an adjustment structure, and a combustible gas detection circuit; the inverter body, the combustible gas detection circuit, and the wireless receiving circuit are installed in an electric control box, and the adjustment mechanism includes a motor reduction mechanism and a support frame. The motor shaft of the motor reduction mechanism is respectively located outside the front and rear ends of its own housing, and the motor reduction mechanism has two identical sets of gearboxes, which are respectively fixedly installed outside the front and rear ends of the housing, and the driving gears of the two sets of gearboxes are respectively installed at the front end of the rear end shaft of the motor and the rear end of the front end shaft. The two sets of gearboxes The power output shaft is respectively located outside the rear side of the rear end gear box and the front side of the front end gear box; the side end of the motor shell and the front side of the support frame are fixedly installed together, the rear side of the support frame is fixedly installed on the front end of the inverter body shell, the rear end power output shaft is fixedly installed with a sleeve, the rear side of the sleeve is fixedly installed on the outer end of the adjustment handle of the inverter body, and the front side end of the front end power output shaft is located outside the front of the electric control box; the power output end of the combustible gas detection circuit is electrically connected to the power input end of the inverter body, and the power output end of the wireless receiving circuit is electrically connected to the power input end of the motor reduction mechanism.

[0007] Furthermore, an indicator bar is fixedly mounted on the front outer side end of the power output shaft at the front end of the motor reduction mechanism.

[0008] Furthermore, the combustible gas detection circuit includes an electrically connected combustible gas detection module and a relay, an alarm, a resistor, and a thyristor. The power output end of the combustible gas detection module is connected to one end of the resistor, the other end of the resistor is connected to the control electrode of the thyristor, the anode of the thyristor is connected to the positive power input end of the combustible gas detection module, the cathode of the thyristor is connected to the positive power input end of the relay and the alarm, and the negative power input end of the combustible gas detection module is connected to the negative power input end of the relay and the alarm.

[0009] Furthermore, the wireless receiving circuit includes an electrically connected wireless receiving circuit module and a relay, the positive power input terminal of the wireless receiving circuit module is connected to the positive control power input terminals of the two relays, the negative power input terminal of the wireless receiving circuit module is connected to the negative power input terminal and the negative control power input terminal of the relay, and the two power output terminals of the wireless receiving circuit module are respectively connected to the positive power input terminals of the two relays.

[0010] Compared with the existing technology, the beneficial effects of the present utility model are as follows: the present utility model is mainly used for mining motor control. Based on the inverter body and combined with the combustible gas detection module, etc., the staff can wirelessly adjust the output power frequency of the inverter body, which brings convenience to the staff. Under the joint action of the combustible gas detection circuit, it can detect in real time whether there is a gas leak in the relevant area. When a gas leak occurs on site, the alarm can promptly sound a warning to nearby staff, urging them to pay attention to safety and evacuate the site. It can also automatically shut down the power supply of the inverter body and the motor, making it impossible for the motor to start and stop moving during rotation, reducing the chance of the motor generating electric sparks due to various reasons and causing serious explosion consequences. In summary, the present utility model has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0013] Figure 2 This is a schematic diagram of the structure of a mining motor.

[0014] Figure 3 It is a partial structural diagram of the utility model.

[0015] Figure 4 This is a circuit diagram of the utility model. DETAILED DESCRIPTION

[0016] Figure 1 、 2As shown in , 3, and 4, the explosion-proof combined inverter for mining includes a power module T1, an inverter body T3, a battery G1, a wireless remote control circuit T5, a wireless receiving circuit 1, and an adjustment structure and a combustible gas detection circuit 3; the power module T1, the inverter body T3, the combustible gas detection circuit 3, the battery G1, and the wireless receiving circuit 1 are installed on a circuit board in the electric control box 4 at the side end of the mining motor, and the adjustment mechanism includes a motor reduction mechanism M1 and a support frame 51. The motor shaft of the motor reduction mechanism M1 is respectively located outside the front and rear ends of its own shell, and the motor reduction mechanism has two identical sets of gear boxes 52, which are respectively fixed to the front and rear ends of the shell by bolts. The driving gear of the gear box 52 is tightly fitted on the front end of the rear end rotating shaft and the rear end of the front end rotating shaft of the motor, respectively. The power output shafts of the two gear boxes 52 are respectively located outside the rear side of the rear end gear box 52 and outside the front side of the front end gear box 52; a support frame 51 is welded to the middle of both sides of the housing of the motor, and the rear end of the support frame 51 is fixedly installed on the front end of the housing of the inverter body T3 by bolts. A sleeve 53 (the rear end is an open structure) is welded to the rear end power output shaft, and the rear side of the sleeve 53 is tightly fitted on the outer end of the adjustment handle of the inverter body T3. There is an opening in the middle of the front end of the electric control box 4, and the front end of the front power output shaft (the outer diameter is smaller than the inner diameter of the opening) is located forward through the opening outside the front end of the electric control box 4.

[0017] Figure 1 、 2 As shown in Figures 3 and 4, an indicator strip 54 is welded horizontally to the front outer side of the power output shaft at the front end of the motor reduction mechanism. The outer side of the electric control box surrounding the indicator strip 54 is marked with numbers representing the inverter's output frequency. The combustible gas detection circuit includes a combustible gas detection module T2, a relay K, an alarm B, a resistor R, and a thyristor VS, which are connected via circuit board wiring. Pin 3 of the power output terminal of the combustible gas detection module T2 is connected to one end of the resistor R, and the other end of the resistor R is connected to the control electrode of the thyristor VS. The anode of the thyristor VS is connected to the positive power input pin 1 of the combustible gas detection module T2. The cathode of the thyristor VS is connected to the positive power input terminals of the relay K and the alarm B. Pin 2 of the negative power input terminal of the combustible gas detection module T2 is connected to the negative power input terminals of the relay K and the alarm B. The wireless receiving circuit includes a wireless receiving circuit module T4 and relays K1 and K2 connected via circuit board wiring. The positive power input terminal 1 of the wireless receiving circuit module T4 is connected to the positive control power input terminals of the two relays K1 and K2. The negative power input terminal 2 of the wireless receiving circuit module T4 is connected to the negative power input terminals and negative control power input terminals of the relays K1 and K2. The two power output terminals 3 and 4 of the wireless receiving circuit module T4 are respectively connected to the positive power input terminals of the two relays K1 and K2.

[0018] Figure 1 、2 As shown in Figures 3 and 4, power input terminals 1 and 2 of power module T1 are connected to the two poles of the AC 220V power supply via wires. The 380V power supply is connected in series via a power switch (not shown) to the three control power input terminals of relay K of the combustible gas detection circuit via wires. The three normally closed contacts of relay K, the power output terminal of the combustible gas detection circuit, are connected to the power input terminal of the inverter body T3 via wires. The power output terminal of the inverter body T3 is connected to the power input terminal of the mining motor M via wires. Power output terminals 3 and 4 of power module T1 are connected to power input terminals 1 and 2 of the combustible gas detection module T2 and power input terminals 1 and 2 of the wireless receiving circuit module T4 via wires. The two normally open contacts of relay K1 and K2, the power output terminal of the wireless receiving circuit, are connected to the positive and negative and negative and positive power input terminals of the motor reduction mechanism M1, respectively, via wires. The detection head of the combustible gas detection module is located outside the front opening of the electrical control box. The power module T1 is a finished product of an AC 220V to DC 6V switching power supply module; relays K, K1, and K2 are DC 6V relays; the sounder B is a finished product of an active continuous sound alarm model XQ6V; the resistance R is 1K; the thyristor VS is a plastic-encapsulated single-phase thyristor model MCR100-1; the motor reduction mechanism M1 is a finished product of a coaxial motor gear reducer with a power of 10W; the combustible gas detection module T2 is a finished product of a combustible gas detection module model MQ-4, which has two power inputs. The device has an input port and a signal output port. When the detector detects a combustible gas leak, the signal output port and power supply are activated. Otherwise, power supply is deactivated. The wireless remote control mechanism T5 and wireless receiving circuit module T4 are finished wireless transmitter and receiver circuit modules, model TWH9238 (similar in principle and structure to automotive wireless remote control and receiver circuit modules). The inverter body T3 is a finished inverter model AE200H / FE550. Battery G1 is a 6V / 10Ah lithium battery. All of the above electrical components utilize existing, mature technologies, and their operating principles will not be elaborated upon.

[0019] Figure 1 、 2As shown in Figures 3 and 4, after turning on the open / close power switch, 380V power enters the power input of the inverter body T3 through the three control power input terminals and three normally closed contact terminals of relay K (a DC contactor can also be used instead). This then energizes the power input terminal of the mining motor M. By adjusting the inverter's adjustment handle, inverter body T3 will output power of varying frequencies to meet the frequency requirements for starting and operating motor M. After 220V power enters the power input of power module T1, pins 3 and 4 of power module T1 output a stable DC 6V power supply that flows into battery G1 (normally, battery G1 is floating charged, ensuring that even if the 220V power supply is cut off, the relevant circuits can still operate normally) and the power input of the wireless receiving circuit. When there is no flammable gas leakage at the scene, pin 3 of the flammable gas detection module T2 does not output a high level, the relay K and the alarm B will not be energized and work, and the inverter body T3 continues to be energized; when a flammable gas leakage occurs at the scene, the 3-pin output of the flammable gas detection module T2 is high, and the resistor R limits the current and reduces the voltage, triggering the thyristor VS to turn on. Then, the relay K is energized and its control power input terminal and the normally closed contact terminal are open, the inverter body T3 loses power and no longer works, the mining motor M also loses power and does not work, and the alarm B is energized and sounds to remind nearby staff that a flammable gas leak has occurred and to evacuate the scene in time (after the main power is disconnected, the thyristor VS is released from the self-locking state). The operator visually observes the inverter's output power frequency, indicated by indicator bar 54, and then presses the first button D1 or the second button D2 of the portable wireless remote control T5. This causes the wireless remote control T5 to transmit a first or second wireless close signal. Upon receiving the first or second wireless close signal, the wireless receiving circuit module T4 outputs a high level at pins 3 or 4, energizing relay K1 or K2, closing its control power input and normally open contacts. This, in turn, energizes the positive and negative, or negative and positive, power inputs of the motor reduction mechanism M1. The power output shaft of the motor reduction mechanism M1 drives the inverter's handle T3 to rotate counterclockwise or clockwise (synchronizing with the indicator bar), gradually decreasing or increasing the inverter T3's output power frequency. The staff presses the first button D1 or the second button D2 of the wireless remote control mechanism T5 again, and the wireless remote control mechanism T5 will transmit the first or second wireless open-circuit signal. After the wireless receiving circuit module T4 receives the first or second wireless open-circuit signal, its 3rd or 4th pin stops outputting a high level, and the relay K1 or K2 is no longer energized to close its control power input terminal and the normally open contact terminal, and then, the positive and negative or negative and positive power input terminals of the motor reduction mechanism M1 lose power and no longer work, and the output power frequency of the inverter body T3 gradually reaches the set value.Through the above, the new type of device, under the joint action of the combustible gas detection circuit, can detect in real time whether there is a gas leak in the relevant area. When a gas leak occurs on site, it can promptly use the alarm to remind nearby workers to pay attention to safety and evacuate the scene. It can also automatically disconnect the power supply of the inverter body and the motor, making it impossible for the motor to start and stop moving during rotation, reducing the chance of the motor generating electric sparks due to various reasons and causing serious explosion consequences.

[0020] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all perspectives, the embodiments should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that come within the meaning and range of equivalents of the claims be included in the present invention.

[0021] In addition, it should be understood that although this specification is described in terms of implementation methods, the implementation methods do not only include an independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A flameproof combined inverter for mining, comprising an inverter body, a wireless remote control circuit, and a wireless receiving circuit, characterized in that: It also has an adjustment structure and a combustible gas detection circuit; the inverter body, combustible gas detection circuit, and wireless receiving circuit are installed in the electric control box; the adjustment mechanism includes a motor reduction mechanism and a support frame; the motor shaft of the motor reduction mechanism is respectively located outside the front and rear ends of its own shell; the motor reduction mechanism has two identical sets of gearboxes, and the two sets of gearboxes are respectively fixedly installed outside the front and rear ends of the shell; the driving gears of the two sets of gearboxes are respectively installed at the front end of the rear end shaft of the motor and the rear end of the front end shaft; the power output shafts of the two sets of gearboxes are respectively located outside the rear side of the rear end gearbox and outside the front side of the front end gearbox; the side end of the motor shell and the front side of the support frame are fixedly installed together, the rear side of the support frame is fixedly installed on the front end of the inverter body shell, the rear end power output shaft is fixedly installed with a sleeve, the rear side of the sleeve is fixedly installed on the outer end of the adjustment handle of the inverter body, and the front side end of the front end power output shaft is located outside the front of the electric control box; the power output end of the combustible gas detection circuit is electrically connected to the power input end of the inverter body, and the power output end of the wireless receiving circuit is electrically connected to the power input end of the motor reduction mechanism.

2. The explosion-proof combined inverter for mining according to claim 1, characterized in that: An indicator strip is fixedly installed on the front outer side of the power output shaft at the front end of the motor reduction mechanism.

3. The explosion-proof combined inverter for mining according to claim 1, characterized in that: The combustible gas detection circuit includes an electrically connected combustible gas detection module and a relay, an alarm, a resistor, and a thyristor. The power output end of the combustible gas detection module is connected to one end of the resistor, the other end of the resistor is connected to the control electrode of the thyristor, the anode of the thyristor is connected to the positive power input end of the combustible gas detection module, the cathode of the thyristor is connected to the positive power input end of the relay and the alarm, and the negative power input end of the combustible gas detection module is connected to the negative power input end of the relay and the alarm.

4. The explosion-proof combined inverter for mining according to claim 1, characterized in that: The wireless receiving circuit includes an electrically connected wireless receiving circuit module and a relay. The positive power input terminal of the wireless receiving circuit module is connected to the positive control power input terminals of the two relays. The negative power input terminal of the wireless receiving circuit module is connected to the negative power input terminal and the negative control power input terminal of the relay. The two power output terminals of the wireless receiving circuit module are respectively connected to the positive power input terminals of the two relays.

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