JPS6326057B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for stacking cut plates, and more particularly to an automatic stacking method that can control the height of a stacked plate surface in a piler device to a constant level.

The steel strip is sheared by a shearer, and the cut plates are conveyed by a belt conveyor and stacked on a piler, but the stacking surface of the cut plates on the piler needs to be maintained at a constant height. If it is too low or too high, scratches will occur on the cutting board, making high-speed shearing work impossible.

Conventionally, in order to maintain the laminated surface of the cut plates in the piler at a constant height, the method of "ON-OFF" operation was performed using a set of proximity switches, and the amount of descent of the piler was determined by measuring the discharge flow rate of the hydraulic system. Detection and control of the height position has been performed using various methods.

However, the method using a proximity switch is unstable due to malfunction due to surrounding metal parts, and it is difficult to accurately determine the height position. In addition, the method of measuring the discharge flow rate of a hydraulic system has poor accuracy due to large fluctuations in the descending speed and leakage amount at the beginning and end of stacking, and conventionally it has been difficult to maintain a constant lifter height. In addition, handling of oil was time-consuming and maintenance was complicated.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a method for laminating cut plates in which the height of the piler laminated surface can be controlled to a constant level.

The gist of the present invention is as follows. That is, a sheet sensor that counts the number of cut plates continuously cut from a steel strip, a lifter that stacks the cut plates, a lifter position sensor that detects the vertical position of the lifter, and a signal from each of the above devices. In a method for stacking cut plates in a piler device comprising a control calculator for inputting and controlling,
The control calculator inputs in advance the thickness of the cut plate and the set lowering amount of the lifter and calculates a predetermined number of sheets corresponding to the set lowering amount, and inputs the cut plate number signal of the sheet sensor and calculates the predetermined number of sheets to be cut. a step of issuing a descending command to the lifter when the number of sheets reached, a step of inputting a signal indicating that the lifter has reached a set descending amount from the lifter position sensor and issuing a stop command to the lifter, and a step of issuing a stop command to the lifter from the lifter position sensor. A cutting plate characterized by comprising the step of receiving a signal indicating the stop position of the lifter, calculating the difference between the set lowering amount and the actual lowering amount of the lifter, and subtracting and correcting the next set lowering amount. This is a lamination method.

The details of the present invention will be explained by examples. First, the piler device used in the present invention will be explained with reference to FIG. The sheared cutting board 2 is conveyed by a belt conveyor 4, and a sheet sensor 6 is passed along the way.
is counted. The cut plates 2 falling from the belt conveyor 4 are guided by a guide plate 8 and stacked on a lifter 10. The lifter 10 is raised and lowered by operating a hydraulic cylinder 14 by operating a hydraulic switching valve 12. The position sensor of the lifter 10 is composed of a Magnescale 16 that descends with the lifter 10 and a Magnescale sensor 18 whose height is fixed.
The control calculator 20 inputs signals from the seat sensor 6 and the magnescale sensor 18 and controls the lifter 1 via the hydraulic switching valve 12 and the hydraulic cylinder 14.
Controls the raising and lowering of 0.

Next, a method of laminating cut plates of the present invention in a piler having the above structure will be explained. First, the thickness of the plate to be cut and the set amount of descent are input in advance to the control calculator 20, and a predetermined number of plates to be cut for the set amount of descent is calculated. When shearing is started and the cutting plates 2 are stacked on the lifter 10, a signal for the number of passing plates 2 from the sheet sensor 6 is constantly input to the control calculator 20, and when a predetermined number of sheets is reached, the control calculator 20 outputs a signal to the hydraulic switching valve 12. A lowering command for the lifter 10 is issued, and the hydraulic cylinder 14 is operated by operating the hydraulic pressure switching valve 12, and the lifter 10 is lowered. The control calculator 20 inputs the signal of the lowering position of the lifter 10 from the Magnescale sensor 18, and when the set lowering amount is reached, the hydraulic switching valve 1 is activated.
2, a command to stop the lifter 10 from descending is issued. Generally, hydraulic systems have a delay in operation, so the lifter 10
After the descent has stopped, the control calculator 20 compares the set descent amount and the actual descent amount, calculates the difference, subtracts this difference from the next set descent amount, corrects it, uses the corrected set descent amount next time, and performs this operation. Repeat. FIG. 2 shows the relationship between the descent command, hydraulic operation, its operation delay, set descent amount, actual descent amount, etc. in chronological order. As shown in FIG. 2, the height of the laminated surface of the lifter 10 can be maintained constant in the present invention by constantly correcting the delay in hydraulic operation. Furthermore, by using the Magnescale 18, the vertical position of the lifter 10 can be easily displayed to the operator in mm units.

As is clear from the above embodiments, the present invention inputs information from the sheet sensor and lifter position sensor into a control calculator to control the descent of the piler, thereby controlling the height of the stacked plate surface of the piler at a constant level. It has become possible to do so, and its practical effects are great.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view showing a piler device and its circuit used in the present invention, and FIG. 2 is a diagram showing a chronological comparison of the stages of the lamination method in the present invention. 2... Cutting board, 6... Sheet sensor, 10...
Lifter, 14... Hydraulic cylinder, 16... Magnescale, 18... Magnescale sensor, 20... Control calculator.

Claims (1)

[Scope of Claims] 1. A sheet sensor that counts the number of cut plates continuously cut from a steel strip, a lifter that stacks the cut plates, a lifter position sensor that detects the vertical position of the lifter, and In a method for stacking cut plates in a piler device comprising a control calculator that inputs and controls signals from each device, the control calculator inputs in advance the thickness of the cut plate and the set lowering amount of the lifter. a step of calculating a predetermined number of sheets corresponding to the set lowering amount; a step of inputting a cut sheet number signal from the sheet sensor and issuing a lowering command to the lifter when the predetermined number of sheets is reached; inputting a signal indicating that the lifter has reached a set lowering amount and issuing a stop command to the lifter; and receiving a signal from the lifter position sensor indicating the lowering stop position of the lifter, which is the difference between the set lowering amount and the actual lowering amount of the lifter. A method for laminating cut plates, comprising the steps of calculating and subtracting and correcting the next set amount of descent. 2. The method of laminating cut plates according to claim 1, wherein the lifter position sensor uses Magnescale.