Brake protection device for motor brake

Abstract

The utility model relates to the technical field of motors, and particularly discloses a motor brake protection device which is an intermediate relay, a coil of the intermediate relay is connected in parallel with a wiring terminal of an electromagnetic brake coil in a brake loop, and a normally open contact of the intermediate relay is connected to a PLC (Programmable Logic Controller) singlechip. According to the utility model, the intermediate relay is connected in parallel at the wiring terminal of the electromagnetic brake coil, the normally open contact of the intermediate relay is connected to the input end of the PLC single chip microcomputer, and when the electromagnetic brake is normally electrified and loosened, the intermediate relay is also electrified and the normally open contact of the intermediate relay is closed, so that signals are fed back to the PLC single chip microcomputer; and if the PLC single-chip microcomputer does not receive the feedback signal, the electromagnetic brake is judged to be abnormal and alarm processing is carried out, so that an operator can more quickly remove faults, and the motor damage caused by the damage of the brake unit is effectively prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a motor brake protection device. Background Art

[0002] At present, the brake motor, also known as the electromagnetic power-off brake motor, includes a motor part and an electromagnetic brake part located at the tail. The control logic of the electromagnetic brake part is: when the brake coil is energized, the brake is released, and the motor part rotates forward or reverse normally; when the brake coil is de-energized, the brake is engaged, and the motor part stops running. However, after a long period of operation, the electromagnetic brake coil may have loose terminals or other abnormal conditions, so that the motor part may still run when the brake is not released. Due to the short action time, the motor protection cannot provide effective protection. If the brake is not opened, the motor operation cannot be discovered and handled in time, resulting in motor damage and mechanical structure damage. Utility Model Content

[0003] The utility model aims to provide a motor brake protection device, which can enable operators to eliminate faults more quickly and effectively prevent motor damage caused by damage to the brake unit.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] The motor brake protection device is an intermediate relay, the coil of the intermediate relay is connected in parallel to the connection terminal of the electromagnetic brake coil in the brake circuit, and the normally open contact of the intermediate relay is connected to the PLC microcontroller.

[0006] Preferably, the model of the intermediate relay is REL-MR-110DC / 21-21.

[0007] Preferably, the brake circuit includes an electromagnetic brake coil and a normally open contact of a third contactor, the coil of the intermediate relay is connected in parallel to the connection terminals of the electromagnetic brake coil, one end of the coil of the third contactor is connected to the negative pole of the power supply and the other end is connected in parallel to the third normally open contact of the first contactor and the third normally open contact of the second contactor and then connected to the positive pole of the power supply.

[0008] Preferably, the coil of the first contactor is connected in series with the normally closed contact of the second contactor and then connected to the PLC microcontroller through the first drive circuit, the coil of the second contactor is connected in series with the normally closed contact of the first contactor and then connected to the PLC microcontroller through the second drive circuit, and the PLC microcontroller is also electrically connected to the coil of the fourth contactor through a fourth drive circuit; the normally open contact of the fourth contactor is connected to the three-phase line of the motor, and the first normally open contact of the first contactor and the first normally open contact of the second contactor are connected in parallel to the three-phase line of the motor; the second normally open contact of the first contactor and the second normally open contact of the second contactor are respectively connected to the PLC microcontroller.

[0009] Preferably, the PLC single chip microcomputer is also electrically connected to two proximity switches.

[0010] Compared with the prior art, the utility model has the following beneficial effects:

[0011] The utility model connects an intermediate relay in parallel at the connection terminal of the electromagnetic brake coil, and the normally open contact of the intermediate relay is connected to the input terminal of the PLC single chip computer. When the electromagnetic brake is energized and released normally, the intermediate relay is also energized and its normally open contact is closed, thereby realizing feedback signal to the PLC single chip computer. If the PLC single chip computer cannot receive the feedback signal, it determines that the electromagnetic brake is abnormal and issues an alarm, allowing the operator to troubleshoot the fault more quickly and effectively preventing the motor from being damaged due to damage to the brake unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is the control circuit diagram of the motor and electromagnetic brake of the utility model.

[0013] Figure 2 This is the logic control circuit diagram of four contactors of the utility model.

[0014] Figure 3 The utility model is a circuit diagram of a PLC single chip microcomputer, a proximity switch, a first contactor, a second contactor and an intermediate relay. DETAILED DESCRIPTION

[0015] In order to make the above features and advantages of the present invention more obvious and understandable, embodiments are given below with reference to the accompanying drawings for detailed description as follows.

[0016] like Figure 1-Figure 3 As shown, this embodiment provides a motor brake protection device, which is used to effectively prevent a brake motor with a brake function from being damaged due to damage to the brake unit. The brake motor includes a motor part and an electromagnetic brake part located at the tail, the motor part is driven and controlled by a main circuit, and the electromagnetic brake part is driven and controlled by a brake circuit, and the main circuit and the brake circuit are both electrically connected to the PLC microcontroller 10.

[0017] In this embodiment, the brake motor is used in the plate lifter on the block production line to drive the lifting plate of the plate lifter to rise or fall. The PLC single chip microcomputer 10 adopts SM822-1BH22, and its input end is electrically connected to two proximity switches 20, model IM5135, one of the proximity switches 20 is in a high position and is used to monitor the rising limit of the lifting plate, and the other proximity switch 20 is in a low position and is used to monitor the falling limit of the lifting plate.

[0018] The output end of the PLC single-chip microcomputer 10 of this embodiment is electrically connected to the coil of the fourth contactor KM40 through the fourth drive circuit, and the output end of the PLC single-chip microcomputer 10 is electrically connected to the coil of the first contactor KM40.1 and the normally closed contact of the second contactor KM40.2 through the first drive circuit, and the coil of the first contactor KM40.1 and the normally closed contact of the second contactor KM40.2 are connected in series with each other; the output end of the PLC single-chip microcomputer 10 is also electrically connected to the coil of the second contactor KM40.2 and the normally closed contact of the first contactor KM40.1 through the second drive circuit, and the coil of the second contactor KM40.2 and the normally closed contact of the first contactor KM40.1 are connected in series with each other. The first contactor KM40.1, the second contactor KM40.2 and the fourth contactor KM40 all use 3RT5044-1AN20. The first drive circuit, the second drive circuit and the fourth drive circuit are respectively conventional contactor drive circuits, including triodes.

[0019] In addition, the normally open contact of the fourth contactor KM40 is connected to the three-phase line of the motor, the first normally open contact of the first contactor KM40.1 and the first normally open contact of the second contactor KM40.2 are connected in parallel to the three-phase line of the motor, and the second normally open contact of the first contactor KM40.1 and the second normally open contact of the second contactor KM40.2 are respectively connected to the PLC microcontroller 10. In this way, when the PLC microcontroller 10 issues an ascending command, the fourth contactor KM40 is energized, the first contactor KM40.1 is energized, and the second contactor KM40.2 is de-energized, and the main circuit The main circuit is closed and turned on, the motor rotates forward, and when it rises to the rising limit, the proximity switch 20 inputs a signal, and the PLC microcontroller 10 disconnects the fourth contactor KM40 and the first contactor KM40.1; and when the PLC microcontroller 10 issues a descending command, the fourth contactor KM40 is energized, the second contactor KM40.2 is energized, and the first contactor KM40.1 loses power, the main circuit is closed and turned on, the motor rotates forward, and when it descends to the descending limit, the proximity switch 20 inputs a signal, and the PLC microcontroller 10 disconnects the fourth contactor KM40 and the second contactor KM40.2. When rising or falling, the second normally open contact of the first contactor KM40.1 and the second normally open contact of the second contactor KM40.2 are respectively fed back to the PLC microcontroller 10.

[0020] The brake circuit includes an electromagnetic brake coil and a normally open contact of the third contactor KM40.3. One end of the coil of the third contactor KM40.3 is connected to the negative pole of the power supply, and the other end is connected in parallel to the third normally open contact of the first contactor KM40.1 and the third normally open contact of the second contactor KM40.2, and then connected to the positive pole of the power supply. The third contactor KM40.3 adopts 3RT6023-1AN20. In this way, when the first contactor KM40.1 is powered and the second contactor KM40.2 is powered off, or when the first contactor KM40.1 is powered off and the second contactor KM40.2 is powered, the third contactor KM40.3 will be powered, and then the normally open contact of the third contactor KM40.3 in the brake circuit will be closed, so that electricity can be sent to the electromagnetic brake coil, the electromagnetic brake coil is powered on and the brake is released, and the motor runs normally. When the first contactor KM40.1 and the second contactor KM40.2 are not energized at the same time, the third contactor KM40.3 will not be energized, and no current will flow into the brake circuit, then the electromagnetic brake will lose power and hold the brake, stabilizing the lifting plate at the rising limit or falling limit height.

[0021] The brake protection device of this embodiment is an intermediate relay KA40.3, model REL-MR-110DC / 21-21. The coil of the intermediate relay KA40.3 is connected in parallel to the terminal of the electromagnetic brake coil in the brake circuit. The normally open contact of the intermediate relay KA40.3 is connected to the PLC single-chip microcomputer 10. When the electromagnetic brake coil is energized, the coil of the intermediate relay KA40.3 is also energized. The normally open contact of the intermediate relay KA40.3 is closed to feedback the release signal to the PLC single-chip microcomputer 10. If the coil terminal of the electromagnetic brake is loose or abnormal, the normally open contact of the third contactor KM40.3 is closed, but the electromagnetic brake cannot be normally energized and released. At this time, the intermediate relay KA40.3 is also not energized and cannot feedback the signal to the PLC single-chip microcomputer 10. If the PLC single-chip microcomputer 10 does not receive the feedback signal, it determines that the electromagnetic brake is abnormal and alarms, allowing the operator to troubleshoot faster and effectively prevent motor damage due to damage to the brake unit.

[0022] The above shows and describes the basic principles, main features and advantages of the invention. Those skilled in the art should understand that the invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the invention. Without departing from the spirit and scope of the invention, the invention may have various changes and improvements, which shall fall within the scope of the invention to be protected. The scope of protection of the invention shall be defined by the attached claims and their equivalents.

Claims

1. The motor brake protection device is characterized by: The brake protection device is an intermediate relay, the coil of the intermediate relay is connected in parallel to the connection terminal of the electromagnetic brake coil in the brake circuit, and the normally open contact of the intermediate relay is connected to the PLC microcontroller.

2. The motor brake protection device according to claim 1 is characterized in that: The model of the intermediate relay is REL-MR-110DC / 21-21.

3. The motor brake protection device according to claim 1 is characterized in that: The brake circuit includes an electromagnetic brake coil and a normally open contact of a third contactor. The coil of the intermediate relay is connected in parallel to the connection terminal of the electromagnetic brake coil. One end of the coil of the third contactor is connected to the negative pole of the power supply and the other end is connected in parallel to the third normally open contact of the first contactor and the third normally open contact of the second contactor and then connected to the positive pole of the power supply.

4. The motor brake protection device according to claim 3 is characterized in that: The coil of the first contactor is connected in series with the normally closed contact of the second contactor and is connected to the PLC microcontroller through the first drive circuit. The coil of the second contactor is connected in series with the normally closed contact of the first contactor and is connected to the PLC microcontroller through the second drive circuit. The PLC microcontroller is also electrically connected to the coil of the fourth contactor through the fourth drive circuit; the normally open contact of the fourth contactor is connected to the three-phase line of the motor, and the first normally open contact of the first contactor and the first normally open contact of the second contactor are connected in parallel to the three-phase line of the motor; the second normally open contact of the first contactor and the second normally open contact of the second contactor are respectively connected to the PLC microcontroller.

5. The motor brake protection device according to claim 4 is characterized in that: The PLC single chip microcomputer is also electrically connected to two proximity switches.

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