CN216016747U - One-to-three circuit of length grader - Google Patents

Abstract

The utility model relates to a length grader drags three circuits one, including major loop, control circuit and monitoring circuit respectively with major loop electrical connection, the major loop is used for three motors of simultaneous control to operate, control circuit is used for controlling the break-make in major loop, monitoring circuit is arranged in monitoring the major loop three motor running state and control circuit's break-make state respectively. This embodiment can control three motors of length grader simultaneously, and circuit structure is simple, and it is little to occupy the switch board space, has reduced the work load of staff's operation.

Description

One-to-three circuit of length grader

Technical Field

The utility model relates to a material screening technical field, concretely relates to length grader drags three circuits one.

Background

The length grader is a multistage grading equipment, generally by 2 ~ 4 sieve section of thick bamboo combinations. Through different combinations and changes of the sizes of the sieve pores, the raw materials can be divided into whole rice, large broken rice, small broken rice and the like; the size in the aperture of every sieve section of thick bamboo is different, and every sieve section of thick bamboo all disposes a motor to drive the rotation of a sieve section of thick bamboo under general condition to carry out the screening of rice length, then every motor all need control to open and stop and need start simultaneously and stop.

Under general conditions, each motor can adopt an independent set of control loop to control starting and stopping, but like this firstly relatively occupy the space of switch board, secondly can increase work load in the aspect of manual control or programming.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the technical problem who exists among the prior art, a length grader drags three circuits is provided, and it can be controlled three motors of length grader simultaneously, and circuit structure is simple, and it is little to occupy the switch board space, has reduced the work load of staff's operation.

The utility model provides an above-mentioned technical problem's technical scheme as follows:

a one-to-three circuit of a length classifier comprises a main loop, a control loop and a monitoring circuit, wherein the control loop and the monitoring loop are electrically connected with the main loop respectively, the main loop is used for controlling three motors to operate simultaneously, the control loop is used for controlling the on-off of the main loop, and the monitoring circuit is used for monitoring the operating states of the three motors in the main loop and the on-off state of the control loop respectively.

Further, the main circuit comprises a breaker Q1, a contactor KM1, thermal relays FR 1-FR 3 and motors M1-M3, one end of a main contact of the breaker Q1 is connected with a system power supply, the other end of the main contact of the breaker Q1 is connected with one end of a normally open main contact of the contactor KM1, the other end of the normally open main contact of the contactor KM1 is connected with one end of a normally closed main contact of the thermal relays FR 1-FR 3 in parallel respectively, the other ends of the normally closed main contacts of the thermal relays FR 1-FR 3 are connected with the motors M1-M3 in a one-to-one correspondence mode, and a control coil of the contactor KM1 is connected with the control circuit.

Further, the control loop comprises a local control loop and a remote control loop, and the local control loop and the remote control loop are connected through a selection switch S1; the selective switch S1 is a single-pole three-throw switch, the first auxiliary contact of which is connected in series between the control power supply and the local control loop, the second auxiliary contact of which is suspended, and the third auxiliary contact of which is connected in series between the control power supply and the remote control loop.

Further, the local control loop comprises a starting button S3, a control coil of a contactor KM1, a normally open auxiliary contact of a breaker Q1 and normally closed auxiliary contacts of thermal relays FR 1-FR 3; one end of a normally open contact of the starting button S3 is connected with a first auxiliary contact of the selector switch S1, and the other end of the normally open contact of the starting button S3 is connected with normally closed auxiliary contacts of the thermal relays FR 1-FR 3, a normally open auxiliary contact of the breaker Q1 and a control coil of the contactor KM1 in series and then grounded.

Further, the local control loop also comprises a self-locking loop, the self-locking loop comprises a first pair of normally open auxiliary contacts of the contactor KM1, and the first pair of normally open auxiliary contacts of the contactor KM1 is connected in parallel with the normally open contact of the start button S3.

Further, the remote control loop comprises an intermediate relay KRA, an intermediate relay KR and a PLC, and also comprises a control coil of a multiplexing contactor KM1, a normally open auxiliary contact of a breaker Q1 and normally closed auxiliary contacts of thermal relays FR 1-FR 3; one end of a control coil of the intermediate relay KRA is connected with a third auxiliary contact of the selector switch S1, and the other end of the control coil is grounded; the intermediate relay KRA at least comprises two normally open contacts, a first auxiliary normally open contact of the intermediate relay KRA is connected in series between the control power supply and the signal input end of the PLC, and the signal output end of the PLC is connected in series with the control coil of the intermediate relay KR and then is grounded; one end of a second auxiliary normally open contact of the intermediate relay KRA is connected with a control power supply, and the other end of the second auxiliary normally open contact is connected with the normally open contact of the intermediate relay KR, the normally closed auxiliary contacts of the thermal relays FR 1-FR 3, the normally open auxiliary contact of the breaker Q1 and the control coil of the contactor KM1 in series and then is grounded.

Further, the monitoring circuit comprises a normally closed auxiliary contact of a breaker Q1, a second auxiliary normally open auxiliary contact of a contactor KM1 and normally open auxiliary contacts of thermal relays FR 1-FR 3, and further multiplexes a PLC (programmable logic controller), the normally closed auxiliary contact of the breaker Q1, the second auxiliary normally open auxiliary contact of the contactor KM1 and one end of the normally open auxiliary contact of the thermal relays FR 1-FR 3 are connected with a control power supply in parallel, and the other end of the normally closed auxiliary contact is connected with a plurality of signal input ends of the PLC in a one-to-one correspondence manner.

Further, one drags three circuit still including protection circuit, protection circuit includes circuit breaker Q1's control coil, still multiplexing PLC, and ground connection behind circuit breaker Q1's the control coil is connected to PLC's signal output part.

The utility model has the advantages that: the utility model discloses a one drags three circuit structure simple, use less electric elements to realize controlling three motors of length grader simultaneously, for example the local control that the main loop only can realize the motor with contactor of a circuit breaker and configuration with the heat that the motor equals quantity is relayed, the problem that the space occupy has both been solved, design and cost of manufacture have been reduced, it opens and stops simultaneously to have realized many motors, and whether overload through many relays, judge which motor has broken down fast, the work load of staff's operation has been reduced.

Drawings

FIG. 1 is a main circuit wiring diagram of the present invention;

FIG. 2 is a wiring diagram of the control circuit of the present invention;

fig. 3 is the PLC wiring diagram of the present invention.

Detailed Description

The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

As shown in fig. 1 to 3, the embodiment provides a one-to-three circuit of a length classifier, which includes a main circuit, a control circuit and a monitoring circuit, wherein the control circuit and the monitoring circuit are respectively electrically connected to the main circuit, the main circuit is used for simultaneously controlling three motors to operate, the control circuit is used for controlling the on-off state of the main circuit, and the monitoring circuit is used for respectively monitoring the operating states of the three motors in the main circuit and the on-off state of the control circuit.

This embodiment carries out on-off control through control circuit to the major loop, and the operation of three motor of major loop simultaneous control has simplified traditional circuit, has reduced the space of operation cabinet and has taken up, has reduced the work load of staff's operation.

As shown in fig. 1, the main circuit includes a breaker Q1, a contactor KM1, thermal relays FR1 to FR3, and motors M1 to M3, one end of a main contact of the breaker Q1 is connected to a system power supply, the other end of the main contact is connected to one end of a normally open main contact of the contactor KM1, the other end of the normally open main contact of the contactor KM1 is connected in parallel to one end of a normally closed main contact of the thermal relays FR1 to FR3, the other ends of the normally closed main contacts of the thermal relays FR1 to FR3 are connected to the motors M1 to M3 in a one-to-one correspondence manner, and a control coil of the contactor KM1 is connected to the control circuit.

In a normal working state, the main contact of the breaker Q1 is closed, the three motors M1-M3 are respectively connected to the normally open main contact of the contactor KM1 through a thermal relay, and the three motors M1-M3 operate simultaneously after the normally open main contact of the control contactor KM1 is closed. When a motor is overloaded during the running process of the motor, the current of a loop of the motor is overlarge, and a corresponding thermal relay normally closed main contact is disconnected to protect the motor.

As shown in fig. 2, the control loop includes a local control loop and a remote control loop, and the local control loop and the remote control loop are connected through a selection switch S1; the selective switch S1 is a single-pole three-throw switch, the first auxiliary contact of which is connected in series between the control power supply and the local control loop, the second auxiliary contact of which is suspended, and the third auxiliary contact of which is connected in series between the control power supply and the remote control loop.

Selector switch S1 is a single pole, triple throw, rotary switch with local/stop/remote three-gear for user selection. When the local gear is dialed, the first auxiliary contact is switched on, and the main loop can be started and controlled through the local control loop; when the stop gear is dialed, the second auxiliary contact is switched on, the main loop can not be started, and the system is in a stop state; when the remote gear is dialed, the third auxiliary contact is connected, and the controller in the remote control loop can be used for starting and controlling the main loop.

As shown in fig. 2, the local control loop comprises a start button S3, a control coil of a contactor KM1, a normally open auxiliary contact of a breaker Q1, and normally closed auxiliary contacts of thermal relays FR1 to FR 3; one end of a normally open contact of the starting button S3 is connected with a first auxiliary contact of the selector switch S1, and the other end of the normally open contact of the starting button S3 is connected with normally closed auxiliary contacts of the thermal relays FR 1-FR 3, a normally open auxiliary contact of the breaker Q1 and a control coil of the contactor KM1 in series and then grounded.

By moving selector switch S1 to the local position, in the local state, a near-field start of the device is possible. Firstly, operating an operating mechanism of the breaker Q1 to close a main contact of the breaker Q1, and synchronously closing a normally open auxiliary contact of the breaker Q1; the starting button S3 is pressed, when the motors M1-M3 are normally started, the thermal relays FR 1-FR 3 are in a normal working state, the main contacts of the thermal relays FR 1-FR 3 are attracted, the closing points of the normally closed auxiliary contacts are in a normal state, the normally open auxiliary contact of the breaker Q1 is attracted, the control coil of the contactor KM1 is electrified and is connected with a zero line or a ground wire, the normally open main contact of the contactor KM1 is closed at the moment, and the three motors M1-M3 in the main circuit are electrified to start running.

Further, the local control loop also comprises a self-locking loop, the self-locking loop comprises a first pair of normally open auxiliary contacts of the contactor KM1, and the first pair of normally open auxiliary contacts of the contactor KM1 is connected in parallel with the normally open contact of the start button S3.

When the normally open main contact of the contactor KM1 is closed, the first pair of normally open auxiliary contacts (see the 13/14 auxiliary contact of the contactor KM1 in fig. 2) of the contactor KM1 is also attracted, the local control loop is started to be self-locked, and when the start button S3 is released, the three motors M1-M3 of the length grader still keep running at the moment. When the motor operation needs to be stopped, the selection switch S1 is shifted to the stop gear position, and the operation of all the motors can be stopped.

With reference to fig. 2 and 3, the remote control circuit includes an intermediate relay KRA, an intermediate relay KR and a PLC, and further multiplexes a control coil of the contactor KM1, a normally open auxiliary contact of the breaker Q1, and normally closed auxiliary contacts of the thermal relays FR1 to FR 3. One end of a control coil of the intermediate relay KRA is connected with a third auxiliary contact of the selector switch S1, and the other end of the control coil is grounded; the intermediate relay KRA at least comprises two normally open contacts, a first auxiliary normally open contact of the intermediate relay KRA is connected in series between the control power supply and the signal input end of the PLC, and the signal output end of the PLC is connected in series with the control coil of the intermediate relay KR and then is grounded; one end of a second auxiliary normally open contact of the intermediate relay KRA is connected with a control power supply, and the other end of the second auxiliary normally open contact is connected with the normally open contact of the intermediate relay KR, the normally closed auxiliary contacts of the thermal relays FR 1-FR 3, the normally open auxiliary contact of the breaker Q1 and the control coil of the contactor KM1 in series and then is grounded.

Firstly, operating an operating mechanism of the breaker Q1 to close a main contact of the breaker Q1, and synchronously closing a normally open auxiliary contact of the breaker Q1; remote gear is dialled to the third gear knob of select switch S1, at the remote control state, intermediate relay KRA ' S control coil gets electricity, see figure 2 and figure 3, intermediate relay KRA ' S the first pair normally open contact (see intermediate relay KRA ' S the 8 th and 12 contacts in figure 3) and the vice normally open contact of second (see intermediate relay KRA ' S the 5 th and 9 contacts in figure 2) are closed simultaneously this moment, intermediate relay KRA ' S the first pair normally open contact leads to PLC ' S signal input part input remote control state signal, PLC ' S signal output part control intermediate relay KR ' S control coil gets electricity this moment, with the normally open contact closure of drive intermediate relay KR, then contactor KM1 ' S control coil gets electricity, the main loop switches on, three motor M1 ~ M3 gets electricity and operates. Similarly, under the condition that the motors are normally started, the thermal relays FR 1-FR 3 are in a normal working state, the main contacts of the thermal relays FR 1-FR 3 are attracted and normally closed, the normally closed auxiliary contacts of the thermal relays FR 1-FR 3 are in a normally closed state, the normally open auxiliary contact of the breaker Q1 is attracted, the control coil of the contactor KM1 is electrified and is communicated with a zero line or a ground wire, at the moment, the three motors M1-M3 of the length classifier start to operate, and the remote starting of the motors is completed.

As shown in fig. 3, the monitoring circuit includes normally closed auxiliary contacts of a breaker Q1 (see contacts 21 and 22 of a breaker Q1 in fig. 3), a second set of normally open auxiliary contacts of a contactor KM1 (see contacts 53 and 54 of a contactor KM1 in fig. 3), and normally open auxiliary contacts of thermal relays FR1 to FR3 (see contacts 97 and 98 of a thermal relay FR1, contacts 97 and 98 of a thermal relay FR2, and contacts 97 and 98 of a thermal relay FR 3), and also multiplexes PLCs. Specifically, one end of a normally closed auxiliary contact of the circuit breaker Q1, a second auxiliary normally open auxiliary contact of the contactor KM1 and normally open auxiliary contacts of the thermal relays FR 1-FR 3 are connected in parallel to a control power supply, and the other ends of the normally closed auxiliary contacts are connected with a plurality of signal input ends of the PLC in a one-to-one correspondence manner. The normally closed auxiliary contact of the breaker Q1 sends a breaker Q1 state signal of the length grader to the PLC, when an operator operates an operating mechanism of the breaker Q1 to close the breaker, the PLC detects the state of the breaker Q1, the working power supply of the main circuit is turned on, and the PLC can be started. When the motors M1-M3 run, the second pair of normally open auxiliary contacts of the contactor KM1 and the normally open main contact of the contactor KM1 are closed in a linkage mode, and the PLC receives a running detection signal of the length grader to indicate that the length grader runs. The normally open auxiliary contacts of the thermal relays FR 1-FR 3 feed back the running conditions of a single motor, when the current of any motor exceeds the setting range of the thermal relay which is correspondingly connected, for example, when the motor is overloaded, the normally closed main contact of the thermal relay is disconnected, correspondingly, the normally open auxiliary contact of the thermal relay is closed, the PLC detects the state of the thermal relay, namely the number of the corresponding motor which is overloaded is obtained, and the system alarms to remind an operator to check the running condition of equipment; meanwhile, in the control loop, when the normally closed auxiliary point corresponding to the thermal relay is disconnected, the control loop is disconnected, so that the control coil of the contactor KM1 is de-energized, and the three motors M1-M3 stop running.

As shown in fig. 3, the one-to-three circuit further includes a protection circuit, the protection circuit includes a control coil of the circuit breaker Q1, and also multiplexes a PLC, and a signal output end of the PLC is connected to the control coil of the circuit breaker Q1 and then grounded. When the system is abnormal, the PLC outputs a control signal to a control coil of the breaker Q1, a main contact of the breaker Q1 is disconnected, the power supply input of a main loop is cut off, a contact of the breaker Q1 in the control loop is also disconnected, and the length grader stops running.

The one-to-three circuit structure of this embodiment is simple, three motors of length grader are controlled simultaneously to the realization of using less electric elements, for example, the local control that the main loop only used a circuit breaker Q1, a contactor KM1 and configuration can realize the motor with the electrothermal relay of motor equals quantity, the problem that the space took has both been solved, design and cost of manufacture have been reduced, it stops to have realized many motors simultaneously to open, and whether overload through electrothermal relay, judge fast which motor has broken down, the work load of staff's operation has been reduced. Still can realize the remote control to the length grader through auxiliary relay KRA and KR and PLC, the start mode is nimble optional, starts efficiently. The running state of each motor is monitored in real time through the monitoring circuit and the protection circuit, and any motor can be stopped and give an alarm when running abnormally, so that the running safety of the system is guaranteed.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (8)

1. The one-to-three circuit of the length grader is characterized by comprising a main loop, a control loop and a monitoring circuit, wherein the control loop and the monitoring loop are electrically connected with the main loop respectively, the main loop is used for controlling three motors to operate simultaneously, the control loop is used for controlling the on-off of the main loop, and the monitoring circuit is used for monitoring the operating states of the three motors in the main loop and the on-off state of the control loop respectively.

2. The one-drive-three circuit of the length grader as claimed in claim 1, wherein the main circuit comprises a breaker Q1, a contactor KM1, thermal relays FR 1-FR 3 and motors M1-M3, one end of a main contact of the breaker Q1 is connected with a system power supply, the other end of the main contact is connected with one end of a normally open main contact of the contactor KM1, the other end of the normally open main contact of the contactor KM1 is connected in parallel with one ends of normally closed main contacts of the thermal relays FR 1-FR 3, the other ends of the normally closed main contacts of the thermal relays FR 1-FR 3 are connected with the motors M1-M3 in a one-to-one correspondence manner, and a control coil of the contactor KM1 is connected with the control circuit.

3. The one-to-three circuit of claim 2, wherein the control loop comprises a local control loop and a remote control loop, and the local control loop and the remote control loop are connected through a selection switch S1; the selective switch S1 is a single-pole three-throw switch, the first auxiliary contact of which is connected in series between the control power supply and the local control loop, the second auxiliary contact of which is suspended, and the third auxiliary contact of which is connected in series between the control power supply and the remote control loop.

4. The one-to-three circuit of the length grader as claimed in claim 3, wherein the local control loop comprises an activation button S3, a control coil of a contactor KM1, a normally open auxiliary contact of a breaker Q1 and normally closed auxiliary contacts of thermal relays FR 1-FR 3; one end of a normally open contact of the starting button S3 is connected with a first auxiliary contact of the selector switch S1, and the other end of the normally open contact of the starting button S3 is connected with normally closed auxiliary contacts of the thermal relays FR 1-FR 3, a normally open auxiliary contact of the breaker Q1 and a control coil of the contactor KM1 in series and then grounded.

5. The length grader one-drive-three circuit according to claim 4, wherein the local control loop further comprises a self-locking loop, the self-locking loop comprises a first pair of normally open auxiliary contacts of contactor KM1, and the first pair of normally open auxiliary contacts of contactor KM1 is connected in parallel with the normally open contact of start button S3.

6. The one-to-three circuit of the length grader as claimed in claim 4, wherein the remote control loop comprises an intermediate relay KRA, an intermediate relay KR and a PLC, and further comprises a control coil of a multiplexing contactor KM1, a normally open auxiliary contact of a breaker Q1 and normally closed auxiliary contacts of thermal relays FR 1-FR 3; one end of a control coil of the intermediate relay KRA is connected with a third auxiliary contact of the selector switch S1, and the other end of the control coil is grounded; the intermediate relay KRA at least comprises two normally open contacts, a first auxiliary normally open contact of the intermediate relay KRA is connected in series between the control power supply and the signal input end of the PLC, and the signal output end of the PLC is connected in series with the control coil of the intermediate relay KR and then is grounded; one end of a second auxiliary normally open contact of the intermediate relay KRA is connected with a control power supply, and the other end of the second auxiliary normally open contact is connected with the normally open contact of the intermediate relay KR, the normally closed auxiliary contacts of the thermal relays FR 1-FR 3, the normally open auxiliary contact of the breaker Q1 and the control coil of the contactor KM1 in series and then is grounded.

7. The one-to-three circuit of the length grader as claimed in claim 6, wherein the monitoring circuit comprises a normally closed auxiliary contact of a breaker Q1, a second pair of normally open auxiliary contacts of a contactor KM1 and normally open auxiliary contacts of thermal relays FR 1-FR 3, and further multiplexes a PLC, one end of the normally closed auxiliary contact of the breaker Q1, one end of the second pair of normally open auxiliary contacts of the contactor KM1 and one end of the normally open auxiliary contacts of the thermal relays FR 1-FR 3 are connected in parallel to a control power supply, and the other end of the normally closed auxiliary contacts are connected with a plurality of signal input ends of the PLC in a one-to-one correspondence manner.

8. The one-to-three circuit of the length grader as claimed in claim 7, wherein the one-to-three circuit further comprises a protection circuit, the protection circuit comprises a control coil of a breaker Q1, and a PLC is further multiplexed, and a signal output terminal of the PLC is connected to the control coil of the breaker Q1 and then grounded.

Images