KR200188008Y1 - Failure Prevention Circuit of Chip Conveyer - Google Patents

Abstract

The present invention relates to a torque limit device malfunction prevention circuit of a chip conveyor. When the first timer operates by monitoring the operation of the torque limit by the first rotation detection switch, the auxiliary relay, the first timer, and the second timer of the drive chain, It is judged that the chip conveyor is stopped at the 1st rotation position, and when the second timer is operated, it is judged that the conveyor is stopped at the 1st rotation position, thereby preventing the malfunction of the torque limit device and at the same time further subdividing the rotation state of the drive chain. The present invention relates to a torque limit device malfunction prevention circuit of a chip conveyor, characterized in that it is possible to accurately grasp an operation error state of a machine.

Description

Failure Prevention Circuit of Chip Conveyer

The present invention relates to a torque limit device malfunction prevention circuit of a chip conveyor. When the first timer operates by monitoring the operation of the torque limit by the first rotation detection switch, the auxiliary relay, the first timer, and the second timer of the drive chain, It is judged that the chip conveyor is stopped at the 1st rotation position, and when the second timer is operated, it is judged that the conveyor is stopped at the 1st rotation position, thereby preventing the malfunction of the torque limit device and at the same time further subdividing the rotation state of the drive chain. The present invention relates to a torque limit device malfunction prevention circuit of a chip conveyor, characterized in that it is possible to accurately grasp an operation error state of a machine.

In general, the chip conveyor can set the operation time and the stop time so that the operator can operate the chip conveyor during the workpiece processing to discharge the chip, and stop the chip discharge operation by stopping the operation of the chip conveyor when the workpiece processing is completed. Doing.

Looking at the automatic operation control device of such a chip conveyor, as shown in Figure 1,

An NC operating panel 10 for setting an operation time and a stop time of the conveyor;

NC main control unit 20 for sending out a cutting cycle start as the operation and stop time is set in the NC operating panel 10;

A PLC control unit 30 for determining whether the conveyor is operated or stopped as the transmission signal of the NC main controller 20 is input;

A machine control panel 40 which selects and sends an operation mode of the conveyor;

An input signal unit 50 indicating an abnormal state of the conveyor as an alarm;

A PLC input / output unit (60) for detecting an operation mode signal of the machine control panel (40) and an abnormal state input signal of the input signal unit (50) and outputting an operation command signal of the PLC control unit (30);

An output signal unit 70 which receives the operation signal of the conveyor of the PLC input / output unit 60 and operates to drive the magnetic contactor;

A magnetic contactor 80 operated by an operation signal of the output signal unit 70;

It is configured to include a motor 90 driven by the operation of the magnetic contactor 80, the operation thereof will be described in detail as follows.

First, the operating time and the stop time of the conveyor are set in the NC operating panel 10, and the NC main controller 20 transmits a cutting cycle start signal to the PLC control unit 30, and the PLC control unit 30 controls the machine control panel. The screw conveyor mode selection switch (40) and the input signal (30) detect the abnormality of the conveyor coming in and determine whether the continuous operation or stop manually by selecting the operation mode of the conveyor intermittent control in automatic mode The operation of the screw conveyor and the operation of the screw conveyor are determined by performing the operation of logic and timer.

In addition, the machine operation panel 40 selects the operation mode of the screw conveyor and sends it to the PLC input and output unit 60, the PLC input and output unit 60 is an abnormal state input signal of the machine control panel 40 and the screw conveyor ( 50), and outputs the operation command output of the screw conveyor sent from the PLC control unit 30 to the output signal 70 side.

In addition, the output signal 70 receives the operation signal of the screw conveyor from the PLC input / output unit 60 to operate the magnetic contactor 80 for driving the screw conveyor, and the conveyor motor 90 by the magnetic contactor 80. Send the.

Meanwhile, referring to the power transfer process of the chip conveyor, as shown in FIG. 2, when the drive motor rotates, the drive chain is operated, and the power is applied to the chip conveyor along the torque limit. This is transmitted, and the drive chain has a check dog for 1 rotation, and the switch for checking the 1 rotation detects the overload of the drive motor to cut off the power of the drive motor.

That is, as shown in FIG. 3, a predetermined time is set in TM1 and the 1-turn detection switch SX1 mounted on the drive chain checks the dog. The dog is not checked and the TM1 is operated immediately, and the overload detection relay KA1 is operated by this contact to cut the driving power to the magnetic contactor supplying power to the driving motor.

However, in this case, the operation of the torque limit is confirmed by the operation of the torque limit. If the dog stops at the position of the 1-turn check switch, the 1-turn detection switch keeps supplying power to the motor and the drive motor is It could work as a cause of breakage.

The present invention is to solve the above problems, by stopping the rotation of the motor by determining the stop of the chain even if the dog stops at the switch for 1 rotation check, to prevent damage to the motor due to overload in advance The purpose is.

As a means for achieving the above object,

The present invention is connected to a switch for detecting the first rotation and the first rotation check relay for confirming one rotation of the chain;

A first timer connected in parallel with the first rotation check relay and operated when an overload occurs, the first timer being operated when the first rotation detection switch stops while checking the dog of the chain;

A second timer operated in conjunction with the operation of the first rotation check relay, the second timer being operated when the first rotation detection switch stops without checking the dog of the chain by lengthening an operation time compared to the first timer;

And an overload relay to turn off the magnetic contactor to cut off the power provided to the motor when the first timer or the second timer is operated.

1 is a block diagram of a typical chip conveyor automatic operation control device.

Figure 2 is a general torque limiter and chip conveyor connection diagram.

3 is a circuit diagram of a conventional circuit;

4 is a circuit configuration diagram of the present invention.

5 is a flow chart illustrating the operation of the present invention.

Explanation of symbols on the main parts of the drawings

1: dog 2: chain

3: torque limit 4: conveyor

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

4 is a block diagram of the present invention, as shown,

A one-turn check relay KA2 connected to the one-turn detection switch to check the moment when the conveyor rotates once;

A first timer TM1 connected in parallel with the first rotation check relay KA2 and operated when an overload occurs, and operated when the first rotation detection switch stops at the first rotation check position;

A second timer TM2 operated in conjunction with the operation of the first rotation check relay KA2 and having a longer operation time than the first timer TM1 so that the first rotation detection switch is operated before the first rotation check;

Magnetic contact when the first timer TM1 or the second timer TM2 is operated The overload relay KA1 which turns off the rotor KM1 and cuts off the power provided to the motor 90 is comprised.

The present invention constituted as described above, the first rotation detection switch SX1 detects one rotation of the conveyor 4, and the first rotation detection switch SX1 is connected to the chain 2 to the dog 1. At the time of confirming, the one-turn confirmation relay KA2 operates to check one revolution of the conveyor.

However, when the conveyor 4 is stopped at the time of confirming one revolution, the first timer TM1 is operated, and in conjunction with this, the overload relay KA1 is operated, and thus the magnetic contactor of the chip conveyor motor ( KM1) is turned off to stop the motor 90 from rotating.

Therefore, when the first timer TM1 is operated and the motor 90 is stopped, the operator can know that the dog 1 is located at the point of the first rotation detection switch SX1.

On the other hand, if the chain 2 is stopped when the dog 1 is located at a point other than the one rotation detection switch point, the second timer TM2 is operated, which means that the second timer TM2 is the dog ( This is because the operating time is longer than that of the first timer TM1 to detect one rotation of 1). Therefore, if the dog is not detected within a predetermined time while the dog 1 is detected once, the second timer TM2 The operator sees the operation of the second timer TM2 and determines that the chain is stopped while the dog is located at a point other than the switch point for detecting the first revolution.

5 is a flow chart showing an operation state of the present invention,

Monitoring operation of the torque limit by the first rotation detection switch of the drive chain, the auxiliary relay, the first timer, and the second timer (S1);

Monitoring (S2) whether the one-turn detection switch is operated within a predetermined time;

Thereafter checking the operation status of the first timer and determining that the chip conveyor is stopped at the first rotation check position when the first timer operates, and generating an alarm (S3);

In step S3, if the second timer is operated by checking the operation status of the second timer while the first timer is not operated, determining that the chip conveyor is stopped by moving out of the first rotation check position and generating an alarm (S4). Wow;

In operation S3, if the second timer does not operate, the operation of the auxiliary operation relay is checked, and when the auxiliary relay is operated, it is determined to be rotated one step. Proceed sequentially.

As described above, the present invention provides the effect of preventing the damage of the motor due to overload by stopping the rotation of the motor by determining the stop of the chain even when the dog stops at the switch unit for one rotation.

Claims (1)

A one-turn check relay KA2 connected to the one-turn detection switch to check the moment when the conveyor rotates once; A first timer TM1 connected in parallel with the first rotation check relay KA2 and operated when an overload occurs, and operated when the first rotation detection switch stops at the first rotation check position; A second timer TM2 operated in conjunction with the operation of the first rotation check relay KA2 and having a longer operation time than the first timer TM1 so that the first rotation detection switch is operated before the first rotation check; And an overload relay KA1 that turns off the magnetic contactor KM1 and cuts off the power provided to the motor 90 when the first timer TM1 or the second timer TM2 is operated. Torque limit device malfunction prevention circuit of chip conveyor.