JPS60184414A - Control device driven by dc machine - Google Patents

Abstract

PURPOSE:To perform normal rolling for a material by installing a mechanism used for returning the speed of a rolling mill to a previously set speed when the tail end of material passing the mill is detected. CONSTITUTION:The front end of a material 1 is detected by a detector 5a, and the height of a loop between rolling mills 2a, 2b is detected by a detector 4. A signal of the detector 4 is compared with the set value of a setter 3 by a comparison control circuit 6, to output its signal to a drive control circuit 9 through a reset control circuit 12 and an REF control circuit 8. Said signal is compared with a signal of speed detector 11 by the circuit 9, to control a motor 10 for the purpose of changing the speeds of mills 2a, 2b. When the material 1 goes out of the detections of detectors 5a, 5b, the circuit commands the circuit 6 to make a signal stored in the circuit 12 to be zero. When the circuit 6 outputs the signal to the circuit 11 by making it to be zero, the mills 2a, 2b are returned to the speeds set previously by a setter 7, and the material is normally rolled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a DC machine drive control device for setting the speed of a DC machine used for rolling glands and the like.

[Prior art]

Conventionally, there has been a device of this type as shown in FIG.

In the figure, 1 is a material (material), and 2a.

2b is a rolling machine, 3 is a height setting device for setting the height of the material,
4 is a height detector 5a that detects the height of the material.

5b is a material detector that detects the presence or absence of material; 6 is a comparison control circuit that compares the signal from the height setting device 3 with the signal from the height detector 4; 7 is a control circuit that sets the speed of the rolling mill 2. 8 is a REF control circuit that calculates the signals from the speed setter 7 and the comparison control circuit 6; 9 is the R
A drive control circuit drives the motor 10 in response to a signal from the EF control circuit 8, and 11 is a speed detector that informs the drive control circuit 9 of the speed of the motor 10.

Next, the operation will be explained. Rolling mill 2” + 2 b
is driven by a motor 10 which is driven at a speed set by a speed setting device 7. The tip of the material 1 is detected by the material detector 5a, the material 1 is rolled by the rolling mill 2, and after biting into the rolling mill 2b, a loop is formed between the rolling mills 2a and 2b, and the height detector 4 The height of the material 1 is detected by the material detector 5, and the material 1 is detected by the material detector 5. The signal detected by the height detector 4 and the height signal set in advance by the height setter 3 are compared to a control circuit 6.
compared by. Next, the comparison control circuit 6 starts control by detecting the material 1 by the material detector 5a and the height detector 4, and until the material 1 is located at the height set by the height setting device 3, the REF control circuit 8 send a signal to. The REV control circuit 8 calculates the signal sent from the comparison control circuit 6 and the signal from the speed setter 7, and sends the result to the drive control circuit 9. Thereafter, the drive control circuit 9 compares the signal from the speed detector 11 with the signal from the speed detector 11 and controls the motor 10 to change the speed of the rolling mill 2 so that the speed corresponds to the signal from the REF control circuit 8 . As a result, when the detection signals of the material 1 by the material detectors 5a and 5b disappear, the comparison control circuit 6 maintains the signals sent up to that point. This control enables the height of the material 1 detected by the height detector 4 to be located at the height set by the height setter 3.

The conventional device is configured as described above.

After the tail end of the material 1 passes the height detector 4, the speed of the motor 10 preset by the speed setting device 7;
In other words, since the speeds of the rolling mills 2ts and 'lb change, there is a drawback that when rolling the material, it cannot be rolled at the normal set speed.

[Summary of the invention]

This invention was made in order to eliminate the drawbacks of the conventional ones as described above. After the tail end of the material passes the height detector, the motor speed set by the speed setting device, that is, the rolling machine speed is adjusted. The object of the present invention is to provide a DC machine drive control device that makes it possible to roll a material at a normal set speed by rolling the material.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. Second
In the figure, 1 is a material, 2a and 2b are rolling machines, 3 is a setting device that sets the height of material 1, 4 is a height detector that detects the height of material 1, and 5 is a detector that detects the presence or absence of material 1. 6 is a comparison control circuit that compares the signal from the height setting device 3 and the signal from the height detector 4; 12 is a reset control circuit that controls the signal from the comparison control circuit 6; 7 8 is a speed setting device that sets the speed of the rolling mills 2a and 2b; 8 is a REF control circuit that calculates signals from the speed setting device 7 and the reset control circuit 12; 9 is a REF control circuit that operates according to the signals from the REF control circuit 8; A drive control circuit that drives the motor 10, 1
1 is a speed detector that informs the drive control circuit 9 of the speed of the motor 10.

Next, the operation of this invention will be explained. Rolling mills 2a, 2
b is driven by a motor 10 which is driven at a speed set by a speed setting device 7.

During operation, the tip of the material 1 is detected by the material detector 5&, the material 1 is rolled by the rolling mill 2&, and after biting into the rolling mill 2b, a loop is formed between the rolling mills 23 and 2b to detect the height. The height of the material 1 is detected by the detector 4, and the material 1 is detected by the material detector 5b.

The signal detected by the height detector 4 is compared in a comparison control circuit 6 with a height signal set in advance by a height setter 8. This comparison control circuit 6 starts its control when the material detector 5a and the height detector 4 detect the material 1, and resets the control circuit until the material 1 is located at the height set by the height setting device 3. 12. Then, the reset control circuit 12 sends this signal to the REF control circuit 8 when either of the material detectors 5a and 5b detects the material 1.

This signal and the signal from the speed setter 7 are sent to the REF control circuit 8.
The signal is calculated and sent to the drive control circuit 9. Thereafter, the drive control circuit 9 compares the signal from the speed detector 11 with the signal from the speed detector 11 so that the speed corresponds to the signal from the REF control circuit 8, and drives and controls the motor 10 to change the speed of the rolling mills 2a and 2b. After that, the material 1 is detected by the material detector 51115b.
When no longer detected, the reset control circuit 12 stores the signal sent out from the comparison control circuit 6 up to that point, and instructs the comparison control circuit 6 to set the signal value to 0 (zero). Upon receiving this command, the comparison control circuit wr6 outputs a signal value of 0 to the reset control circuit 12, regardless of the difference between the height setter 8 and the height detector 4. At this time, the reset control circuit 12 sends the signal to the REF control circuit 8 at a certain acceleration/deceleration rate until the previously stored signal value from the comparison control circuit 6 becomes 0 (zero). The REF control circuit 8 sends this signal to the drive control circuit 9, and the drive control circuit 9 accelerates or decelerates the motor 10 and the rolling mills 2M and 2b.

By these controls, the tail end of the material 10 is detected by the material detector 5a,
After passing through 5b, the motor 10, that is, the rolling mill 2B, 2b
The speed can be smoothly returned to the speed previously set by the speed setting device 1, and the material can be rolled normally.

In the above embodiment, a DC machine drive control device in a steel bar plant has been described, but the same effect is exerted on all devices related to DC machine drive control that sets rolling mill speed, such as DC machine drive control in a hot rolling plant.

〔Effect of the invention〕

As described above, according to the present invention, the comparison control circuit determines the absence of material based on the signal from the material detector, and the subsequent reset control circuit returns the acceleration/deceleration rate of the rolling mill speed to zero at a certain acceleration/deceleration rate. With this configuration, the material detector detects the passing of the tail end of the material, and the speed of the rolling mill can be smoothly returned to the preset speed, making it possible to roll the material normally. Not the preceding material during rolling,
The speed of the material can be returned to the set speed without fluctuation, and a highly accurate and reliable DC machine drive control device can be obtained.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram showing a conventional DC machine drive control device;
The figure is a configuration diagram showing a DC machine drive control device according to an embodiment of the present invention. 1... Material b2a+2b... Rolling machine, 3... Height setting device, 4... Height detector b5a+5b... Material detector, 6... Comparison control circuit, 7... Speed Setting device, 8
... REF control circuit, 9... Drive control circuit, 10.
··motor. 11... Speed detector, 12... Reset control circuit. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Patent Applicant Mitsubishi Electric Co., Ltd. Procedural Amendment (Voluntary) Director General of the Japan Patent Office (1939) 1. Indication of the case Japanese Patent Application No. 59-039774 2. Name of the invention DC machine drive control device 3. Case of the person making the amendment Relationship with Patent Applicant Address 2-3 Marunojiju-chome, Chiyoda-ku, Tokyo Name
(601) Mitsubishi Electric Corporation Representative Hitoshi Katayama 4, Agent Postal code 】05 Address 1-4-10 Nishi-Shinbashi, Minato-ku, Tokyo (2) Detailed description of the invention in the specification ( 3) Drawing 6, contents of amendment (1) The scope of claims will be amended as shown in the attached sheet. (2) The specification shall be amended as follows. (2) (3) Revise Figure 1 as shown in the attached sheet. 7. List of attached documents (1) One document stating the amended scope of claims (
2) One or more documents stating the amended Figure 1; the signal from the height detector that detects the height of the claimed material after the amendment; and the signal from the material detector that detects the presence or absence of the material; A comparison control circuit that controls the height by a signal from a height setting device that sets the height of the material, and a certain adjustment that determines whether there is no material based on the signal from the comparison control circuit and the signal from the material detector. a reset control circuit that returns the motor speed to zero; and a REFEBENCI control circuit that operates a signal from a speed setter that sets the speed of the motor, a signal from the comparison control circuit, and a signal from the reset control circuit. , a drive control circuit that compares a signal from a speed detector that detects the speed of a motor driven by a signal from the REF control circuit and a signal from the REF control circuit to control the motor to a desired speed; A DC machine drive control device characterized by not changing the preset motor speed in the case of material heat.

Claims (1)

[Claims] a comparison control circuit that controls the device by a signal from a height detector that detects the height of the material, a signal from the material detector that detects the presence or absence of the material, and a signal from a height setting device that sets the height of the material; , a reset control circuit that determines the absence of material based on the signal from the comparison control circuit and the signal from the material detector and returns to zero at a certain acceleration/deceleration rate; and a signal from the speed setting device that sets the speed of the motor; A REF (REFERENCE) control circuit that calculates a signal from the comparison control circuit and a signal from the reset control circuit, and a signal from a speed detector that detects the speed of a motor driven by the signal from the REF control circuit. A DC machine drive control device comprising a drive control circuit that compares signals from the REF control circuit and controls the speed to a required speed, and does not change a preset motor speed in the case of material heat. .