Bidirectional belt control system

Abstract

The utility model relates to a bidirectional belt control system in the technical field of motor electric control, which comprises a live wire U, a null line N, a remote start-stop loop, a manual start-stop loop, a forward rotation control loop, a reverse rotation control loop and a motor wiring loop, and is characterized in that one end of the remote start-stop loop and one end of the manual start-stop loop are connected with the live wire in parallel through a first change-over switch; the other end of the remote start-stop loop and the other end of the manual start-stop loop are provided with a second change-over switch, the second change-over switch is electrically connected with the forward rotation control loop and the reverse rotation control loop, and an SA change-over switch is additionally arranged at the tail end of the remote start-stop loop and the tail end of the manual start-stop loop. The switch-on and power-on of the reverse rotation control loop and the forward rotation control loop are switched through the SA change-over switch, and meanwhile, the reverse rotation control loop and the forward rotation control loop have a linkage start-stop function, so that the forward and reverse rotation control of the motor can be realized. A PLC start-stop contact does not need to be added, and a cable from the PLC to the low-voltage cabinet does not need to be laid.

Description

Technical Field

[0001] The utility model relates to the technical field of motor and electric control, in particular to a belt bidirectional control system. Background Art

[0002] Coal for the boilers of coal-fired power plants is typically transported to the coal bunkers by conveyor belts. Generally, the direction of the final conveyor belt in the coal conveyor system is determined by the initial and future construction locations. However, the location of the boilers in future construction may change, forcing the final conveyor belt to rotate in the opposite direction to unload the coal. Therefore, the conveyor belt must be able to operate in both directions.

[0003] Generally, the entire coal transportation system of a power plant uses PLC or DCS to automatically control the belt in each transportation link. The local control box adds a reverse button, the remote control PLC system adds a reverse I / O point, the automatic program of the coal transportation PLC or DCS system is modified, and the control cable is laid to the local cabinet and the PLC or DCS system cabinet. According to conventional practices, the original electrical circuit needs to be rerouted with major changes or a new electrical box (with built-in forward and reverse circuits) needs to be remade. The renovation construction volume is large, the cost is increased, and the renovation process is complicated. Therefore, in view of these current situations, it is urgent to develop a two-way belt control system to meet the needs of actual use. Utility Model Content

[0004] The utility model aims to provide a belt bidirectional control system for completing the forward and reverse control circuit modification of the belt motor without changing the layout of the original power distribution cabinet and the automatic program of the coal conveying PLC or DCS system.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A belt bidirectional control system, comprising:

[0007] Live wire U, neutral wire N, remote start-stop circuit, manual start-stop circuit, forward control circuit, reverse control circuit and motor wiring circuit, one end of the remote start-stop circuit and the manual start-stop circuit are connected in parallel with the live wire through a first switching switch, and the other end of the remote start-stop circuit and the manual start-stop circuit is provided with a second switching switch, and the second switching switch is electrically connected to the forward control circuit and the reverse control circuit respectively.

[0008] In the above description, as a further solution, the motor wiring circuit includes live wire U, live wire W, live wire V and KM1 normally open port, KM2 normally open port, and the wiring sequence of live wire U, live wire W and live wire V of KM1 normally open port and KM2 normally open port are opposite to each other.

[0009] In the above description, as a further solution, the remote start-stop circuit is provided with a PCL normally closed port and a PCL normally open port in sequence, and the two ends of the PCL normally open port are provided with a KM1 normally open port and a KM2 normally open port in parallel in sequence. The manual start-stop circuit is provided with a TA normally closed port, a 2TA normally closed port and a 2QA normally open port in sequence, and the two ends of the 2QA normally open port are provided with a QA normally open port, a KM1 normally open port and a KM2 normally open port in parallel in sequence.

[0010] In the above description, as a further solution, the forward control circuit includes the normally closed port KM2 and the magnetic induction coil KM1;

[0011] The reverse control loop includes the normally closed port KM1 and the magnetic induction coil KM2.

[0012] In the above description, as a further solution, it also includes a signal light feedback loop, which consists of a stop signal loop and a drive signal loop. The stop signal loop is composed of a 1LD signal light, a 2LD signal light, a KM1 normally closed port and a KM2 normally closed port. The KM1 normally closed port, the KM2 normally closed port, the 1LD signal light and the 2LD signal light are connected in series between the live wire U and the neutral wire N in sequence. The drive signal loop includes a 1HD signal light and a 2HD signal light, which are respectively connected in parallel between the second switching switch and the neutral wire N.

[0013] The beneficial effects produced by the utility model are as follows:

[0014] This application describes a bidirectional belt control system that incorporates an SA switch at the end of both the remote and manual start / stop circuits. This switch switches the conduction between the reverse control circuit and the forward control circuit, while also providing a coordinated start / stop function between the reverse and forward control circuits. This eliminates the need for additional PLC start / stop contacts or cabling from the PLC to the low-voltage cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the electrical principle of a belt bidirectional control system described in the utility model. DETAILED DESCRIPTION

[0016] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with the embodiments and drawings. The contents mentioned in the embodiments are not intended to limit the present invention. The present invention is described in detail below in conjunction with the drawings.

[0017] See also Figure 1A belt bidirectional control system specifically implemented therein includes a live wire U, a neutral wire N, a remote start-stop circuit, a manual start-stop circuit, a forward control circuit, a reverse control circuit and a motor connection circuit. One end of the remote start-stop circuit and the manual start-stop circuit are connected in parallel with the live wire through a first switching switch, and the other ends of the remote start-stop circuit and the manual start-stop circuit are provided with a second switching switch, and the second switching switch is electrically connected to the forward control circuit and the reverse control circuit respectively.

[0018] Specifically, the motor wiring circuit includes live wire U, live wire W, live wire V and KM1 normally open port and KM2 normally open port, and the wiring sequence of live wire U, live wire W and live wire V to KM1 normally open port and KM2 normally open port are opposite to each other.

[0019] Specifically, the remote start-stop circuit is provided with a PCL normally closed port and a PCL normally open port in sequence, and the two ends of the PCL normally open port are provided with a KM1 normally open port and a KM2 normally open port in parallel. The manual start-stop circuit is provided with a TA normally closed port, a 2TA normally closed port and a 2QA normally open port in sequence, and the two ends of the 2QA normally open port are provided with a QA normally open port, a KM1 normally open port and a KM2 normally open port in parallel.

[0020] Specifically, the forward control loop includes a normally closed port of KM2 and a magnetic induction coil of KM1, and the reverse control loop includes a normally closed port of KM1 and a magnetic induction coil of KM2.

[0021] Preferably, it also includes a signal light feedback loop, which consists of a stop signal loop and a drive signal loop. The stop signal loop consists of a 1LD signal light, a 2LD signal light, a KM1 normally closed port and a KM2 normally closed port. The KM1 normally closed port, the KM2 normally closed port, the 1LD signal light and the 2LD signal light are connected in series between the live wire U and the neutral wire N in sequence. The drive signal loop includes a 1HD signal light and a 2HD signal light, which are respectively connected in parallel between the second switching switch and the neutral wire N.

[0022] When you need to remotely control the forward start of the belt motor: Figure 1 The 1 and 2 ports of the first switch are turned on, the 1 and 2 ports of the second switch are turned on, the normally open port of PCL changes to a closed state, and the current flows through the normally closed port of PCL, the normally open port of PCL, the second switch, the normally closed port of KM2, and the magnetic induction coil of KM1. The magnetic induction coil of KM1 is energized, and the motor wiring circuit and the remote start / stop circuit are changed to a closed state through the normally open port of KM1, and can be continuously energized, so that the belt motor rotates forward;

[0023] On the contrary, the 3rd and 4th ports of the second switching switch are turned on, and the current flows through the PCL normally closed port, PCL normally open port, the second switching switch, the KM1 normally closed port and the KM2 magnetic induction coil. The KM1 magnetic induction coil is energized, and the motor wiring circuit and the remote start and stop circuit are transformed into a closed state through the KM2 normally open port, and can be continuously energized, so that the belt motor rotates forward, and the KM2 normally closed port in the forward control circuit becomes open, and the forward control circuit is not energized.

[0024] When the local control belt motor starts in forward rotation, it is only necessary to connect the 3 and 4 ports of the first switching switch to disconnect the power supply of the remote start-stop circuit and switch to the manual start-stop circuit. The forward and reverse conversion is consistent with the above-mentioned remote control method, so it will not be repeated here.

[0025] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention is disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of the above-disclosed technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technology of the present invention, which do not depart from the content of the technical solution of the present invention, are within the scope of the technical solution of the present invention.

Claims

1. A belt bidirectional control system, characterized in that: include: Live wire U, neutral wire N, remote start-stop circuit, manual start-stop circuit, forward control circuit, reverse control circuit and motor wiring circuit, one end of the remote start-stop circuit and the manual start-stop circuit are connected in parallel with the live wire through a first switching switch, and the other end of the remote start-stop circuit and the manual start-stop circuit is provided with a second switching switch, and the second switching switch is electrically connected to the forward control circuit and the reverse control circuit respectively.

2. A belt bidirectional control system according to claim 1, characterized in that: The motor wiring circuit includes live wire U, live wire W, live wire V and KM1 normally open port and KM2 normally open port. The wiring sequence of live wire U, live wire W and live wire V to KM1 normally open port and KM2 normally open port are opposite to each other.

3. A belt bidirectional control system according to claim 2, characterized in that: The remote start-stop circuit is provided with a PCL normally closed port and a PCL normally open port in sequence, and the two ends of the PCL normally open port are provided with a KM1 normally open port and a KM2 normally open port in parallel in sequence; The manual start-stop circuit is provided with a TA normally closed port, a 2TA normally closed port and a 2QA normally open port in sequence, and both ends of the 2QA normally open port are provided with a QA normally open port, a KM1 normally open port and a KM2 normally open port in parallel in sequence.

4. A belt bidirectional control system according to claim 3, characterized in that: The forward control circuit includes a KM2 normally closed port and a KM1 magnetic induction coil; The reverse control loop includes the normally closed port KM1 and the magnetic induction coil KM2.

5. The belt bidirectional control system according to claim 1, characterized in that: It also includes a signal light feedback loop, which consists of a stop signal loop and a drive signal loop. The stop signal loop is composed of a 1LD signal light, a 2LD signal light, a KM1 normally closed port, and a KM2 normally closed port. The KM1 normally closed port, the KM2 normally closed port, the 1LD signal light, and the 2LD signal light are connected in series between the live wire U and the neutral wire N. The drive signal loop includes a 1HD signal light and a 2HD signal light, which are respectively connected in parallel between the second switching switch and the neutral wire N.

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