KR200227131Y1 - Jamming Prevention Signal Detection Device - Google Patents

Abstract

In order to prevent the jamming caused by mechanical overpressure in the rolling mill, the operator sets the roll gap by the screw motor during manual operation by the driver. The present invention relates to a signal detection device for preventing jamming, which prevents occurrence of a condition that cannot be opened. When the rolling force of a screw is detected and the rolling force exceeds a predetermined value, a jamming signal is generated to generate a screw drive motor and a servo. Stop the operation of the valve.

Description

Jamming Prevention Signal Detection Device

1 is a block diagram showing the configuration of a conventional rolling apparatus.

2 is a block diagram showing the configuration of the anti-jamming signal detection apparatus according to the present invention.

Figure 3 is an embodiment showing the configuration of the jamming signal detection apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

11: level converter 12: servo valve operation unit

13: Servo valve 17: Rolling amount insulation amplifier

18: jamming detection unit 19: first relay unit

20: roller driving insulation amplifier 21: reverse rotation detection unit

22: forward rotation detection unit 23: rolling jamming detection unit

24: second relay portion 25: cut-off portion

The present invention relates to a signal detection device for preventing the jamming, in particular to set the roll gap by the screw motor during manual operation by the driver in order to prevent the jamming caused by mechanical overpressure in the rolling mill due to the overpressure due to a mistake in the setting operation The present invention relates to a signal detection device for preventing jamming, which prevents the occurrence of a state in which the roll gap of the rolling mill cannot be opened by the force of a screw motor.

In general, jamming means that the gap of the rolling roll cannot be opened due to the power of the motor due to overpressure in the rolling mill. In this case, it takes 3-4 hours to open the gap with external force and take action according to the situation. do.

FIG. 1 is a block diagram showing the configuration of a conventional rolling apparatus. Referring to FIG. 1, the manual / auto conversion switch 14 may be moved from the manual driving unit 15 or the automatic driving unit 16. Referring to FIG. The motor drive unit 7 is controlled through the control unit. The motor drive unit 7 receiving the control signal generates a rotational force by driving the screw drive motor 5, and the rotational force rotates the screw 4 to apply a reduction force to the rolling roll 2 to apply the rolling material 1. Roll.

The reduction force detection sensor 4 is installed between the rolling roll 2 and the screw 4 to detect the reduction force, and the reduction force detection signal is input to the current / voltage conversion unit 11 and converted into a voltage signal. It is input to the automatic driving unit 16.

The automatic driving unit 16 includes a rolling control computer. The rolling control computer receives the pressing force detection signal and calculates the pressing force of the current rolling roll 2, and the operator requests the calculated pressing force. The control signal is output to the servovalve operation unit 12 and the motor drive unit 7 according to the comparison result compared with the reference reduction force for rolling the rolled material 1 to thickness.

The servo valve operation unit 12 receives the control signal to drive the servo valve 13 to adjust the hydraulic pressure flowing into the hydraulic cylinder 6 to adjust the rolling force applied to the rolling roll 2, and the motor driving unit 7. The screw driving motor 4 is driven to adjust the rolling force applied to the rolling roll 2.

In the conventional rolling equipment as described above, the roll gap is manually adjusted in advance in order to roll the steel sheet. In the rolling mill of the thick plate, the screw motor is manually lowered by the driver to lower the zero point at the time when a rolling reduction of 1400 tons is shown by the rolling reduction sensor. Adjust if possible.

In this process, if the operator presses more than 3000 tons of overpressure, the screw nut is jammed and cannot be controlled by the power of the screw motor. Therefore, it is necessary to take action by external force. There was a problem that occurred.

The present invention is to solve the above problems, an object of the present invention is to provide a jamming signal detection device that can substantially prevent the over-pressure of the screw down in advance in order to prevent the jamming in the rolling mill in advance. .

In order to achieve the above object, an apparatus according to the present invention includes a rolling force detection sensor installed between a screw and a rolling roll to detect a rolling force, and a rolling amount detected by the rolling force detection sensor in a rolling system of a rolling mill. A level converter for converting the detection signal into a voltage signal at a level that can be used by the control computer, a rolling amount insulation amplifying unit for isolating and amplifying the input and output of the rolling amount detection signal output from the level converter, and the rolling amount insulation When the rolling amount detection signal output from the amplifier is received and the reference voltage is exceeded, the jamming detection unit outputs a jamming detection signal and the jamming detection signal output from the jamming detection unit receives a relay contact signal. A first relay unit for outputting and receiving a driving signal from a roller table for pushing a rolled material into the rolling roll A roller driving insulation amplifier for insulating and amplifying an input and an output, a reverse rotation detection unit for receiving a roller driving signal output from the roller driving insulation amplifying unit and amplifying only a reverse rotation signal, and outputting the roller driving insulation amplifying unit; Rolling for outputting the roller driving detection signal when the reference value is exceeded by comparing the forward rotation detection unit for receiving the roller drive signal and detecting only the forward rotation signal and the rotation detection signal output from the forward rotation detection unit and the reverse rotation detection unit with a reference value. And a second relay unit for receiving a roller driving detection signal output from the rolling jamming detector and outputting a relay contact signal, and the relay contact when the first relay unit and the second relay unit are turned on at the same time. Receives the power voltage signal from the motor driving unit to the motor and from the servo valve operation unit It is provided with a blocking unit for blocking the signals output to the servovalve.

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

2 is a block diagram showing the configuration of a signal for preventing jamming according to the present invention.

Referring to Figure 2, the anti-jamming signal detection device according to the present invention is installed between the screw (4) and the rolling roll (2) for detecting the rolling force and the rolling force detection sensor 3, the rolling force detection sensor The level converter 11 converts the rolling amount detected in (3) into a voltage signal of a level that can be used by the control computer, and inputs and outputs the rolling amount detection signal output from the level converter 11. When the rolling amount insulation amplification unit 17 to insulate and amplify and the rolling amount detection signal output from the rolling amount insulation amplifying unit 17 are received and compared with the reference voltage, the jamming detection signal is output. Pushing the rolled material into the jamming detection unit 18, the first relay unit 19 for receiving a jamming detection signal output from the jamming detection unit 18 and outputting a relay contact signal, and the rolling roll (2) Drive signal from the roller table. A roller drive insulation amplifier 20 for receiving and amplifying the input and the output by receiving the input, and a reverse rotation detector 21 for receiving the roller drive signal output from the roller drive insulation amplifier 20 and amplifying only the reverse rotation signal. And a forward rotation detector 22 that receives a roller drive signal output from the roller drive insulation amplifier 20, and detects only a forward rotation signal, and outputs the forward rotation detector 22 and the reverse rotation detector 21. When the rotation detection signal is compared with the reference value and exceeds the reference value, the relay contact signal is output by receiving the rolling jamming detector 23 for outputting the jamming detection signal and the jamming detection signal output from the rolling jamming detector 23. The motor driving unit 7 receives a power voltage signal through the relay contact when the second relay unit 24 and the first relay unit 19 and the second relay unit 24 are turned on at the same time. In Consists teoro and the blocking portion 25 for blocking the signal output to the servo valve 13, the servo valve operating portion (12).

Hereinafter, the operation and effects of the present invention will be described.

Referring to FIGS. 2 and 3, the present invention will be described. When the roll gap is adjusted, the screw 4 is lowered while the rolled material 1 is not inserted into the roll 2 so that the upper roll and the lower roll are moved. In the attached state, the screw (4) is lowered and a pressing force is applied. Normally a 700 ton reduction force is applied per mm and the screw is adjusted to zero at a reduction force of 1400 tons by adjusting the screw to 2 mm where the reduction force increases linearly, in which the operator accidentally exceeds 2 mm. When the screw 4 is lowered, when the overpressure of 3000 ton or more is applied, the pressing force is sensed by the load cell 3 and the detection signal is output to the level converter 11. Since the signal sensed by the load cell 3 is usually several mV, this level is not available in a computer. Therefore, the level converter 11 converts the level by raising the level from 0V to 10V. The level reducing force detection signal is converted into the jamming signal detection apparatus according to the present invention to detect the occurrence of the jamming.

3 shows an embodiment of the configuration of the jamming signal detection apparatus according to the present invention.

Since the reduction force detection signal output from the level converter 11 is input to the rolling control computer and used for rolling control, the input and output are isolated and amplified to prevent the signal from being affected by the device according to the present invention. Insulated amplification is carried out by the rolling amount insulation amplifier 17 and outputs. The rolling amount insulation amplifier 17 amplifies using the transformer T1 to insulate the input and the output. The reduction force detection signal output from the rolling amount insulation amplification unit 17 is inputted to the magnetization detection unit 18 and compared with a voltage value corresponding to the reduction force that can cause magnetization and the operational amplifier OP1. The voltage corresponding to the pressing force of the jamming is set by adjusting the variable resistor R21. When the input pressing force sensing signal exceeds the set voltage value, the operational amplifier OP1 outputs the jamming detection signal.

The jamming detection signal output from the jamming detector 18 is input to the first relay unit 19 and amplified by the operational amplifier OP2, and then the transistor Q1 is switched on to the first relay RY1. By applying power, the relay contact is turned on to apply + Vcc power to the contact of the second relay.

On the other hand, the driving signal of the roller table for pushing the rolled material into the rolling roll 2 is input to the input terminal (B) of the roller driving insulation amplification unit 20, the driving signal is to insulate the input and output to amplify It is amplified by the roller driving insulation amplifier 20 and output.

The roller driving signal output from the roller driving insulation amplifier 20 is inputted to the reverse rotation detection unit 21 for amplifying only the reverse rotation signal and the forward rotation detection unit 22 for detecting only the forward rotation signal to reverse rotation rolling force and forward rotation. Rotation drive signals are respectively detected and output. When the roller drive signal output from the forward rotation detection unit 22 and the reverse rotation detection unit 21 is compared with the reference value in the rolling jamming detection unit 23 and exceeds the reference value, the roller drive detection signal is output.

Since the roller driving detection signal output from the rolling jamming detection unit 23 is input to the second relay unit 24 and compared by the comparator OP4 to output a “low” signal, the transistor Q2 is switched to the off state. The relay contact is turned off by cutting off the power supply to the second relay RY1. Therefore, the + Vcc power input through the first relay RY1 is not applied to the breaker 25.

On the other hand, in the zero adjustment state, since the drive signal of the roller table for pushing the rolled material into the rolling roll 2 is not input to the input terminal B of the roller driving insulation amplifying unit 20, the roller driving insulation amplifying unit is not input. The roller drive signal is not output at 20, and there is no output signal at the reverse rotation detection unit 21 and the forward rotation detection unit 22.

In addition, since the roller driving detection signal is not output from the rolling jamming detection unit 23 and the comparator OP4 of the second relay unit 24 outputs a “high” signal, the transistor Q2 is switched on. Thus, when power is applied to the second relay RY1, the second relay 2 is operated to maintain the b contact on. Accordingly, the + Vcc power supply passing through the first relay RY1 is applied to the breaker 25 through the second relay RY2 so that the relay R of the breaker is operated to operate the motor drive 7 and the screw drive motor 5. The contact b provided between the b) and the contact b provided on the autonomous driving unit 16 and the servovalve operation unit 12 are turned off. The operation of the screw drive motor 5 and the servovalve operation part 12 is stopped by blocking these b contact points.

As described above, according to the present invention, it is possible to prevent overpressure of the rolling mill due to an incorrect operation of the operator during zero adjustment of the rolling mill, thereby preventing damage to the rolling mill roll and screw locking due to the overpressure.

Claims (1)

A rolling system of a rolling mill, comprising: a rolling force detection sensor provided between a screw and a rolling roll to detect a rolling force; A level converter for converting the rolling amount detected by the rolling force detection sensor into a voltage signal of a level that can be used by a control computer; A rolling amount insulation amplifying unit for amplifying the rolling amount detection signal output from the level converter by isolating an input and an output; A jamming detector configured to receive a rolling amount detection signal output from the rolling amount insulation amplifier and output a jamming detection signal when the rolling amount detection signal is exceeded by a reference voltage; A first relay unit receiving a jamming detection signal output from the jamming detector and outputting a relay contact signal; A roller driving insulation amplifying unit which receives a driving signal from a roller table for pushing a rolled material into the rolling roll and insulates and amplifies the input and the output; A reverse rotation detection unit receiving the roller driving signal output from the roller driving insulation amplifier and amplifying only the reverse rotation signal; A forward rotation detector configured to receive a roller drive signal output from the roller drive insulation amplifier and detect only a forward rotation signal; A rolling jamming detector for outputting a roller driving detection signal when the rotation detection signal output from the forward rotation detection unit and the reverse rotation detection unit exceeds a reference value by comparing with the reference value; A second relay unit receiving a roller driving detection signal output from the rolling jamming detection unit and outputting a relay contact signal; When the first relay unit and the second relay unit is turned on at the same time at the same time the power supply voltage signal through the relay contact is provided with a blocking unit for blocking the signals output from the motor drive unit to the motor and the servo valve operation unit to the servo valve Jamming prevention signal detection device, characterized in that.