Mining permanent magnet motor with braking function

Abstract

A mining permanent magnet motor with a braking function belongs to the technical field of motors and comprises a permanent magnet motor body with an electromagnetic braking mechanism, a tension sensor and a control circuit. One end of the tension sensor and the tail end of a steel wire rope of the tensioning trolley are fixedly installed together, the other end of the tension sensor is fixedly installed at one end of the rear side of a tensioning trolley rack, and the motor body is fixedly installed at one end of the front side of the tensioning trolley rack. The winding of a power output shaft of the motor body and the head end of a steel wire rope of the tensioning trolley are fixedly mounted together; the control circuit is electrically connected with the power supply module. The tensioning degree of the conveying belt can be monitored in real time, the electromagnetic brake mechanism and a power source of the permanent magnet motor body can be automatically disconnected after the conveying belt reaches the tensioning degree, the rotor is braked through the electromagnetic brake mechanism, and therefore the situation that the conveying belt is pulled too tight due to inertia when the motor is powered off, and the conveying belt is damaged is avoided. Therefore, the belt conveyor can stably and reliably convey materials as much as possible.

Description

Technical Field

[0001] This utility model relates to the technical field of supporting mechanisms for conveying equipment, and in particular to a mining permanent magnet motor with braking function. Background Technology

[0002] To ensure the conveying efficiency of belt conveyors used in mining (such as those used in coal mines), tensioning devices are installed. For larger belt conveyors, to achieve good tension, the tensioning device (tensioner) typically uses a permanent magnet motor to drive a gear reducer. The reducer's winding mechanism winds the steel wire rope, and a pulley mechanism pulls the tensioning trolley forward or backward. This tensioning trolley then tensions or loosens the conveyor belt to meet the required tension. (After the tensioning trolley is tensioned or loosened, its own mechanism causes the tensioning roller at its upper end to push the conveyor belt upward or downward, thus tightening or loosening it slightly. During operation, the rubber conveyor belt gradually stretches; therefore, except during the commissioning phase, the motor typically drives the tensioning trolley to tighten the conveyor belt.)

[0003] While existing motors combined with tensioning trolleys have achieved automatic tension adjustment of conveyor belts, certain technical problems remain due to structural limitations. Specifically, adjustment requires visual observation of the conveyor belt tension. Inexperienced operators may adjust the belt too loosely or too tightly, negatively impacting its normal operation. Furthermore, when adjusting the belt tension using existing tensioning devices, if the operator is inexperienced and the power switch is switched off at the appropriate time, the motor's rotor inertia may cause it to continue pulling the belt tighter via related mechanisms after shutdown. This means the adjusted belt tension may be relatively higher than expected. Therefore, it is highly necessary to provide a permanent magnet motor device that can automatically cut off power and stop the shaft rotation when the conveyor belt is pulled to the appropriate tension, working in conjunction with tensioning equipment for mining belt conveyors. Utility Model Content

[0004] To overcome the shortcomings of existing tensioning devices used with mining belt conveyors, as described in the background, due to structural limitations, this utility model provides a tensioning device for use with mining belt conveyors, etc. During operation, it can monitor the tension of the conveyor belt in real time. Once the desired tension is reached, it can automatically disconnect the power supply and brake the rotor via an electromagnetic braking mechanism. This achieves better tension adjustment and ensures stable and reliable material transport by the belt conveyor. This is a mining permanent magnet motor with braking function used in mining belt tensioners.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A mining permanent magnet motor with braking function includes a permanent magnet motor body with an electromagnetic braking mechanism, a tension sensor, a power module, and a control circuit. One end of the tension sensor is fixedly installed to the end of the wire rope of the tension trolley, and the other end of the tension sensor is fixedly installed to the rear end of the tension trolley frame. The motor body is fixedly installed to the front end of the tension trolley frame. The winding disc of the power output shaft of the motor body is fixedly installed to the beginning end of the wire rope of the tension trolley. The power module and the control circuit are installed in an electrical control box. The power output terminal of the control circuit is electrically connected to the electromagnetic braking mechanism of the motor body and the power input terminal of the motor body. The power output terminal of the power module is electrically connected to the power input terminal of the tension sensor and the control circuit. The signal output terminal of the tension sensor is electrically connected to the power input terminal of the control circuit.

[0007] Furthermore, the control circuit includes an adjustable resistor, a resistor, a transistor, and a relay that are electrically connected. One end of the adjustable resistor is connected to one end of the first resistor and one end of the second resistor. The other end of the second resistor is connected to the base of the transistor. The collector of the transistor is connected to the negative power input terminal of the relay. The other end of the first resistor is connected to the emitter of the transistor. The control power input terminal and the positive power input terminal of the relay are connected.

[0008] Furthermore, the motor body can also be a DC motor.

[0009] The beneficial effects of this utility model are as follows: When used in conjunction with tensioning equipment such as mining belt conveyors, the control circuit can monitor the tension of the conveyor belt in real time during operation. Once the conveyor belt reaches the required tension, it automatically disconnects the power supply to the electromagnetic brake mechanism and the permanent magnet motor, and brakes the rotor through the electromagnetic brake mechanism. This prevents the conveyor belt from becoming too tight due to inertia when the motor is powered off, thus achieving better tension adjustment and ensuring the stable and reliable transport of materials by the belt conveyor. Based on the above, this utility model has good application prospects. Attached Figure Description

[0010] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0011] Figure 1 This is a top-view schematic diagram of the overall structure and the tensioning trolley of this novel device.

[0012] Figure 2 This is a schematic diagram of the main structure of the new permanent magnet motor.

[0013] Figure 3 This is a new type of circuit diagram. Detailed Implementation

[0014] Figure 1 , 2 As shown in Figure 3, a mining permanent magnet motor with braking function includes a permanent magnet motor body M with an electromagnetic braking mechanism DC1, a power module Z1, a tension sensor Z2, and a control circuit 1. One end of the tension sensor Z2 is fixedly installed to the end of the wire rope 21 of the tension trolley 2, and the other end of the tension sensor Z2 is fixedly installed to the rear right end of the tension trolley 2 frame. The motor body M is fixedly installed to the front right end of the tension trolley 2 frame. A winding disc 3 is welded to the front of the power output shaft of the motor body, and the middle part of the winding disc 3 is fixedly installed to the beginning end of the wire rope 21 of the tension trolley. The power module Z1 and the control circuit 1 are installed in the electrical control box.

[0015] Figure 1 , 2 As shown in Figure 3, the control circuit includes an adjustable resistor RP1, resistors R1 and R2, a transistor Q1, and a relay J1 connected via circuit board wiring. One end of the adjustable resistor RP1 is connected to one end of the first resistor R1 and one end of the second resistor R2. The other end of the second resistor R2 is connected to the base of the transistor Q1. The collector of the transistor Q1 is connected to the negative power input terminal of the relay J1. The other end of the first resistor R1 is connected to the emitter of the transistor Q1. The positive power input terminal of the relay J1 is connected to the control power input terminal. The two normally closed contacts of the relay J1 are connected to the power input terminals of the motor body M and the electromagnetic brake mechanism DC1 via wires. The motor body M is an AC 220V, 380V, or DC motor. The power input terminals 1 and 2 of the power module Z1, the two control power input terminals of the relay J1 in the control circuit, and the AC 220V power input terminal are connected via wires. The power output terminals 3 and 4 of the power module Z1, the power input terminal of the tension sensor Z2, the power input terminal of the control circuit, the positive power input terminal of the relay J1, and the emitter of the transistor Q1 are connected by wires. The signal output terminal of the tension sensor Z2 and the signal input terminal of the control circuit are connected by the other end of the adjustable resistor RP1 by wires.

[0016] Figure 1 , 2As shown in Figure 3, after the AC 220V power supply enters the power input terminal of the power module Z1, the power module Z1 outputs a stable DC 12V power supply through pins 3 and 4, which enters the power input terminal of the control circuit and the tension sensor Z2. When the motor body M tightens the conveyor belt through the winding disc 3, pulley block 22, and wire rope 21, the tension sensor Z2 will be simultaneously subjected to tension. The greater the tension (tension force), the greater the tension force on the force-bearing surface of the tension sensor Z2, and the higher the voltage signal output from its pin 3; conversely, the smaller the tension force, the lower the voltage signal output. When the tension force detected by the tension sensor Z2 is relatively large, the signal voltage output from pin 3 of the tension sensor Z2 is divided by the adjustable resistors RP1 and R1, and the voltage is reduced and the current is limited by the resistor R2. The voltage is higher than 0.7V at the base of the transistor Q1. The transistor Q1 will conduct, and the collector outputs a low level to the negative power input terminal of the relay J1. The relay J1 will be energized and its control power input terminal and normally closed contact terminal will be open. Neither the motor body M nor the electromagnetic brake mechanism DC1 will be energized (if the electromagnetic brake mechanism DC1 is de-energized, the shaft of the motor body will seize). When the tension detected by the tension sensor Z2 is relatively small, the signal voltage output from pin 3 of the tension sensor Z2 is divided by the adjustable resistors RP1 and R2. The voltage drop and current limiting by resistor R2 enters the base of transistor Q1, which is below 0.7V. Transistor Q1 will be cut off, and its collector will no longer output a low level to the negative power input terminal of relay J1. Relay J1 will be de-energized and will no longer be energized. Its control power input terminal and normally closed contact terminal will close, and both the motor body M and the electromagnetic brake mechanism DC1 will be energized and work. After the electromagnetic brake mechanism DC1 is energized, it will no longer lock the motor body shaft. After the motor body M is energized, its power output shaft drives the winding disc to rotate clockwise, and the wire rope continues to tighten the conveyor belt 23 through the pulley group. Once the conveyor belt 23 is tensioned, the base voltage of transistor Q1 again exceeds 0.7V, causing transistor Q1 to conduct and relay J1 to be energized again, opening its control power input terminal and normally closed contact. This prevents the motor body M and the electromagnetic brake mechanism DC1 from being energized again (the de-energization of the electromagnetic brake mechanism DC1 would lock the motor body's shaft). In practical applications, operators can reverse the rotation of the motor body's power output shaft (controlled by a forward / reverse power switch) as needed. The motor body M's shaft drives the winding disc to rotate counterclockwise, gradually loosening the conveyor belt 23 and preventing it from becoming overly taut. Through this process, the control circuit can monitor the conveyor belt tension in real time. Once the conveyor belt reaches the required tension, it automatically disconnects the power to the electromagnetic brake mechanism and the permanent magnet motor, and brakes the rotor via the electromagnetic brake mechanism. This prevents the conveyor belt from becoming overly taut due to inertia when the motor is de-energized, thus achieving better tension adjustment and ensuring stable and reliable material transport by the belt conveyor. Figure 3In this configuration, the tension sensor is a finished product of model NTJL-1, which has two power input terminals and one signal output terminal. The signal output terminal outputs a voltage signal of 0-5V depending on the tension. The relay J1 is a DC12V model. The transistor Q1 is a 9013 (NPN) model. Resistors R1 and R2 are 4.7K and 100K respectively. The adjustable resistor RP1 has a resistance of 47K (in this embodiment, it is adjusted to 12.7K. When the resistance value is relatively large, the voltage drop between it and resistor R1 is large. Thus, when the tension force is relatively large, transistor Q1 will conduct, which means the tension force is set relatively large. When the resistance value is relatively small, the voltage drop between it and resistor R1 is small. Thus, when the tension force is relatively small, transistor Q1 will conduct, which means the tension force is set relatively small). The power module Z1 is a finished product of AC 220V to DC 12V switching power supply module.

[0017] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model.

[0018] Furthermore, it should be understood that although this specification describes the embodiments, the embodiments do not necessarily contain only one independent technical solution. This way of describing the specification is only for 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 embodiments that can be understood by those skilled in the art.

Claims

1. A mine-used permanent magnet motor with brake function, comprising a permanent magnet motor body with an electromagnetic brake mechanism, a tension sensor, and a power module, characterized in that, The tension sensor has one end fixedly installed with the wire rope tail end of the tension trolley, the other end fixedly installed at the rear end of the tension trolley frame, the motor body fixedly installed at the front end of the tension trolley frame, the power output shaft winding disc of the motor body fixedly installed with the wire rope head end of the tension trolley, the power module and the control circuit installed in the electric control box, and the power output end of the control circuit electrically connected with the electromagnetic brake mechanism of the motor body and the power input end of the motor body, the power output end of the power module electrically connected with the power input end of the tension sensor and the control circuit, and the signal output end of the tension sensor electrically connected with the power input end of the control circuit.

2. The mine-used permanent magnet motor with a braking function according to claim 1, characterized in that, The control circuit comprises an adjustable resistor, a resistor, a triode and a relay electrically connected, one end of the adjustable resistor connected with one end of the first resistor and one end of the second resistor, the other end of the second resistor connected with the base of the triode, the collector of the triode connected with the negative power input end of the relay, the other end of the first resistor connected with the emitter of the triode, and the control power input end and the positive power input end of the relay connected.

3. The mine-used permanent magnet motor with brake function according to claim 1, characterized in that, The motor body can also be a direct current motor.

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