JPS588422Y2 - Digital counter type automatic cutting machine control device - Google Patents

Description

[Detailed description of the invention] This invention relates to an automatic sizing cutting device for steel materials, and in particular to an improvement of a control device for an automatic cutting machine with a set of digital counters that digitally counts the transfer amount of steel materials and issues cutting commands for each sizing length. .

In recent years, in order to increase the speed of rolling processing lines, rolled materials are welded together in long lengths so that they pass seamlessly through the processing line, and the continuously manufactured steel materials are automatically cut into fixed dimensions to make them into standard lengths. A method of finishing has been adopted.

As automatic cutting machines in such cases, digital counter type automatic cutting machines are widely used because of their high cutting accuracy and easy control operations.

The disadvantage of this automatic cutting machine is that if a defective part such as a welded part occurs in the middle of a regular length cut, it is necessary to first switch the automatic mode of the cutting machine to manual and manually operate it by visual inspection to cut off the defective part. This results in irregular lengths.

This irregular length must be re-cut in order to be finished and shipped to a shorter length than the regular length that is being automatically cut (a multiple of the unit length), which increases man-hours and cuts steel materials. This leads to a decrease in yield due to

The present invention aims to eliminate the above-mentioned drawbacks by improving a control device for a cutting machine, and will be described based on embodiments shown in the drawings.

In the operation block diagram of FIG. 1 showing the mechanism of the control device, 1 is the cutting machine main body, 2 is the steel material (material to be cut), and the cutting machine 1
A measuring roll 3 and a pulse generator 4 are provided on the input side of the steel material 2, and a pulse signal A from the pulse generator 4 is sent to a subtraction counter 5 and an addition counter 6 to digitally count the amount of steel material 2 transferred.

In the conventional device, a cutting length command B set to a predetermined length is preset in the counters 5 and 6, a fixed length cutting command C in automatic mode is sent from the subtraction counter 5 for each cutting length, and a transfer command is sent from the addition counter 6. Display signals for the amount and cutting length are output, but as described above, the short steel material produced when removing defective parts of the steel material does not become the standard length.

However, in the device of the present invention, a pulse generating circuit 7 that counts the amount of steel transferred per unit length, a detection circuit 8 that detects a defective part of the steel material and transmits and holds the signal, and the above circuit 7 are installed at the subsequent stage of the device.
, 8, and a signal control circuit 10 are provided to issue a cutting command when the output signals of Even when it comes to parts, this part is automatically cut to a standard length.

That is, the pulse generating circuit 7 inputs each digit of the addition counter 6 (for example, in the case of 1 m unit, 10 cm, 1 cm, and 1 m).
It is composed of an AND circuit that manually inverts the measurement signals (E,, E2...Em) of m), and it corresponds to the unit length by capturing when the counter output of each digit becomes all O. A pulse signal F is detected.

The detection circuit 8 is an SR flip-flop, and the cutting machine 1
A signal G from a defective part detector 11 provided at a position of unit length +α in front of the input side of the flip-flop is inputted to the S terminal of the flip-flop.

The coincidence detection circuit 9, which receives the signals F and H from both the circuits 7 and 8, is also configured as an AND circuit.

The reason why the defective part detector 11 is installed at a distance of more than a unit length from the cutting machine 1 is to prevent the defective part from passing through the cutting machine between the time the defective part is detected and the next unit length pulse sent. In order to prevent this, +α is determined in the range of one unit length or more and less than two unit lengths, taking into account the detection accuracy of the detector 11, but it is better to make the separation α smaller, since it may be caused by defects accompanying the defective part. This is preferable because the number of cut portions to be cut can be reduced and the yield can be improved.

Furthermore, instead of the detector 11 described above, the operator may visually observe the defective part and transmit the detection signal G, but in this case as well, for the same reason, the observation point should be set at a position that satisfies the above conditions. is recommended.

The signal control circuit 10 is an AN that inputs the cutting command C of the existing mode of the subtraction counter 5 and the inversion signal H of the detection circuit 8.
D circuit, the output of the AND circuit, and the coincidence detection circuit 9
The output signal J is sent to a drive circuit (not shown) of the cutting machine and is also returned to the R terminal of the flip-flop 8.

FIG. 2 shows the output signals of each of the circuits described above arranged in a time chart, and the operation will be explained in detail with reference to the same figure.

As shown in Figure A, the pulse generator circuit 7 outputs a unit length pulse P1...P of the amount of steel transferred.

1. Po is transmitted continuously, but in normal automatic mode disconnection, the signal from the detector 11 to the detection circuit 8 is not communicated, so the disconnection command from the subtraction counter 5 is output as is through the signal control circuit 10.

When a defective part of the steel material approaches the cutting machine, the detector 11 reacts (t-T1), and at the same time as the defective part is detected, the flip-flop 8 sends a signal (HI3), and the signal control circuit 10 receives the inverted signal (H=O). The cutting command C in the 1-motion mode is canceled, but the cutting command is the next pulse P.

The match detection circuit 9 holds the signal until the signal is transmitted (Figure 2, Part 3).

When the pulse Pn is transmitted (t='r2), the -coincidence detection circuit 9 issues a disconnection command (1, J=
1) is transmitted, and at the same time: 1) the flip-flop 8 is reset (HI3); and 2) its inverted signal (H=1) is fed back to the signal control circuit 10, and the automatic mode disconnection of the subtraction counter 5 is restarted.

The cutting operation of the present device is completed as described above, but after confirming that the defective part has passed through the cutting machine, cut off the defective part in the manual mode of the cutting machine, remove the defective part, and switch back to automatic mode. be returned.

In this way, the present invention is equipped with a digital circuit that instructs and controls the cutting point of a defective part of steel material using a unit length pulse of the amount of steel material transferred in the control device of an automatic cutting machine with a complete set of digital counters. The resulting short steel material is automatically finished into a regular length that is a multiple of the unit length, making it unnecessary to re-cut the irregular length steel material, which greatly contributes to saving man-hours and improving yield.

[Brief explanation of the drawing]

FIG. 1 is an operational block diagram of a control device implementing the present invention, and is an example of a digital circuit. FIG. 2 is a time chart showing the output signals of each circuit constituting the device of the present invention, in which A is a pulse transmitting circuit, C is a detection circuit, and C is a coincidence detection circuit. Symbols in the diagram 1: Cutting machine body, 2: Steel material, 3: Measuring roll, 4 [Pulse generator, 5: Subtraction counter,
6: Addition counter, 7: Pulse transmission circuit, 8: Detection circuit, 9-coincidence detection circuit, 10: Signal control circuit.

Claims (1)

[Scope of utility model registration request] The digital control circuit of the automatic cutting machine, which includes a digital counter for cutting steel materials to a fixed size, includes a pulse transmitting circuit 7 that counts the amount of steel material transferred to the cutting machine for each unit length, and a pulse transmitting circuit 7 that counts the amount of steel material transferred to the cutting machine for each unit length, and a pulse transmitting circuit 7 that counts the amount of steel material transferred to the cutting machine for each unit length, and a pulse transmitting circuit 7 that counts the amount of steel material transferred to the cutting machine for each unit length. A detection circuit 8 that detects a defective part of the steel material at a position below the length and holds the signal, and a coincidence detection circuit 9 that sends a signal when the holding signal of the detection circuit 8 and the pulse signal of the pulse sending circuit 7 match are provided. A control device for an automatic cutting machine with a digital counter set, characterized in that the automatic mode of the cutting machine is canceled by the transmission from the detection circuit 8, and the cutting is commanded by the transmission from the coincidence detection circuit 9.