JPH0655330B2 - Stretch carrevera - Google Patents

Description

TECHNICAL FIELD The present invention relates to improvements in stretch levelers.

(Prior Art) Various levelers for correcting bending, warping, and unevenness of a metal plate have been put into practical use, and one of them is a stretch type straightening machine (hereinafter referred to as a stretcher leveler).

A conventional example of this stretcher leveler will be described with reference to FIG. 6. A stretcher leveler 100 is a bed 101 fixed horizontally and accurately on a foundation, a rail 102 attached to this bed, and this rail. A grip side grip head 103 that slides on 102 and grips one end of the metal plate W, and a positioning means 104 for this head,
The pulling-side grip head 105 is arranged so as to face the gripping-side grip head 103, slides on the rail 102, and holds the other end of the metal plate W, and a pulling means 106 that pulls the head.

The positioning means 104 moves the grip side grip head 103 largely according to the size of the metal plate W, and for example, the nut 103 formed in a part of the head 103.
The feed screw 104a meshes with a, bearings 104b and 104b that support the screw 104a, and a motor 104d with a speed reducer 104c that rotates the screw 104a left and right.

The pulling means 106 strongly pulls the pull-side grip head 105, and
5, a ram 106a that is pin-locked, a piston rod 106b that is pin-locked to the other end of the ram, a hydraulic cylinder 106c that advances and retracts the piston rod 106b, and a hydraulic supply device 106d. Incidentally, the ram 106a
Slides on the ram guide 106e and moves horizontally.

The stretcher leveler 100 of this conventional example is provided with a scale plate shown in FIG. 7 in addition to the above configuration. Scale plate 110
Is the bed 10 below the pull-side grip head 105.
1 is attached and visible to the operator.

On the other hand, from the pull side grip head 105, the pointer 111
Is suspended, and the pointer 111 overlaps the scale on the scale plate 110. Therefore, the scale plate 1 fixed to the bed 101
The moving amount of the pull-side grip head 105 is read based on 10.

Next, regarding the operation of the stretcher leveler 100, the plate thickness:
An example will be described of a stainless steel metal plate W having 1.5 mm, a plate width: 1500 mm, a plate length: 6000 mm, and a controlled elongation amount: 0.3%, that is, 18 mm.

The operator retracts the grip side grip head 103 according to the length of the metal plate W to be processed, for example, if the length is large.

Both ends of the metal plate W are gripped by the grip side grip 103 and the pull side grip 105. Each grip 103,
A hydraulic mechanism (not shown) 105 closes the claw strongly.

The metal plate W includes local bends, irregularities, and wrinkles, and is bent by its own weight in the gripped state, and the central portion thereof is the rail 10.
Close to or in contact with 2. At this point, the pointer 111 indicates the scale 0 of the scale plate 110. (See FIG. 8A) Next, the pulling means 106 is operated to pull the pull-side grip head 105 closer. Both ends of the bent metal plate W are pulled and become horizontal. The operator observes this process and reads the pointer 111 at the time when he is confident that he is level. As shown in FIG. 8B, the pointer 111 has a scale 12
Point 3 and the amount of elongation is counted from this point.

Subsequently, the pull-side grip head 105 moves to stretch the metal plate W, and in this process, the metal plate W is locally bent,
Corrects irregularities and wrinkles.

The operator monitors the pointer 111, and when the pointer 111 reaches the scale 141 (= 123 + control value 18), the movement of the pull-side grip head 105 is stopped and the correction work is finished.

(Problems to be Solved by the Invention) As described above, in the stretcher 100 according to the conventional example, it is difficult to specify the count start time point shown in FIG.
Since it depends on the operator's judgment, there are significant individual differences.

Then, it is indispensable to add the known amount of control growth to the reading at the time of starting counting, the work becomes complicated, and there is a possibility that correction errors may occur due to an addition error. Therefore, an alternative technique has been studied, and, for example, Japanese Patent Publication No. 40-1755 proposes an "effective stroke automatic control system".

The above method is used for electrodes, contacts, conductors, pinions, racks,
Equipped with an electromagnetic clutch, reset spring, stroke indicator and pointer, it electrically detects the start time of counting and counts the amount of extension from that time, so it is possible to perform highly accurate correction work without depending on the intuition of the operator. It is a thing.

However, this method is not practical because the structure is extremely complicated, the electric control is complicated, and it is expensive.

Therefore, an object of the present invention is to promote automation of the stretch leveler by making the elongation measuring means for unmanned operation simple and inexpensive.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention allows a pair of grip heads moving along rails on a bed to grip both ends of a metal plate, and The metal plate is rectified by pulling, the lower surface position of the gripped metal plate is detected, and the metal plate is provided with a metal plate horizontal recognizing means that outputs a detection signal at a position where the metal plate moves from the bent state to the horizontal state, In a stretch leveler equipped with an extension amount measuring means for measuring the moving distance of the pull side grip head from the time when the detection signal of the metal plate horizontal recognizing means is received, the extension amount measuring means is used for pulling the pull side grip head and When the slider-type scale plate that is movable in the returning direction and the pulling side grip head are returned in synchronization with the head, An electromagnet that pushes back the da-type scale plate and, when the head is pulled, adsorbs the slider-type scale plate and demagnetizes by receiving the detection signal of the metal plate horizontal recognizing means, and this electromagnet acts on the slider-type scale plate. A pointer that points to the zero point of the scale plate when in contact and moves in synchronization with the pull-side grip head.

That is, the elongation measuring means of the present invention includes a slider-type scale plate similar to a conventional scale plate, a simple electromagnet provided on the pulling side grip head side, and a conventional pointer similarly provided on the pulling side grip head side. It is a simple one.

(Operation) The lower surface position of the metal plate gripped by the pair of grip heads is detected by the metal horizontal recognizing means, and this recognizing means emits a detection signal at a position where the metal plate moves horizontally from bending to horizontal.

From the start of the pulling motion of the stretcher leveler until the detection signal of the metal plate horizontal recognizing means is received, the pointer points to the zero point of the scale plate, and in this state the scale plate moves by the electromagnet together with the pull side grip head.

The electromagnet is demagnetized when the detection signal of the metal plate horizontal recognition means is received. After that, the scale plate remains stationary, and the pointer and the electromagnet move together with the pull-side grip head.

When the pulling operation is completed, the electromagnet returns to the original position, contacts the scale plate on the way, and pushes the scale plate back to the original position.

(Example) The Example of this invention is described below based on an accompanying drawing.
The same parts as those of the conventional device are referred to by the numbers in the conventional example, and the structural description will be omitted.

FIG. 1 is a front view of a stretch leveler 1 according to the present invention. The stretch leveler 1 is the same bed 101, rail 102, and grip side grip head 1 as described in the conventional device.
03, a pull side grip head 105, and the like.

The present invention is characterized in that the stretcher leveler 1 is provided with a metal plate horizontal recognizing means 10 and a stretching amount measuring means 20 around the right pulling side grip head 105 at substantially the center thereof. These means 10, 20 will be described below. Detailed description.

FIG. 2 is a principle diagram according to an embodiment of the metal plate horizontal recognizing means 10. This means 10 is a detection bar 11 formed by bending a strip plate into an L shape, and urges the detection bar upward. Spring 12 and pin 13 for locking the detection bar to the bed 101
And a limit switch 14 that engages the end 11a of the detection bar.

The detection bar 11 aligns the upper end 11b with the horizontal neutral line L ₁ of the metal plate W at the position shown in the drawing, and is pushed downward to rotate counterclockwise to align the upper end 11b with the reference line L ₂ and the limit switch 1
Switch 4 from ON to OFF, and push it further down to imagine line B
It rotates to the position shown in.

On the other hand, FIG. 3 is a principle diagram according to an embodiment of the elongation amount measuring means 20. The means 20 is a rail 21 screwed to the bed 101 and an external force which is fitted to the rail 21 to a certain degree or more. Slider type scale plate 22 that slides when receiving
A protruding portion 22a protruding from the scale plate, an electromagnet 23 contacting the protruding portion, an arm member 23a for firmly contacting the electromagnet 23 to the pull side grip head 105, and a scale hanging from the grip head 105 as well. It includes a pointer 24 facing the front surface of the plate 22 and a proximity switch 25 attached to the scale plate 22.

This proximity switch 25 includes a pair of light emitting / receiving elements 25a and 25b as shown in FIG. 4 which is a view taken along the line AA of FIG.
And a structure having a permanent magnet 25c on the back surface,
It can be freely attached to the scale plate 22 by hand and the presence or absence of the pointer 24 is detected.

The operation of the stretch leveler 1 having the above structure will be described below. For the operation of the same parts as those of the conventional device, the description of the conventional example is cited.

FIG. 5A shows a state where the metal plate W is bent by its own weight and the detection bar 11 is pushed down to the lower limit by the lower surface thereof, and the electromagnet 23 is attracted to the scale plate 22 and the pointer 24 points to the scale 0. Indicates that

When the pull-side grip head 105 is moved to the pull-side, the lower surface of the metal plate W rises, and the detection bar 11 suppressed by this also rises.

As shown in FIG. 5B, when the upper surface of the detection bar 11 reaches the reference line L ₂ , the limit switch 14 is switched from off to on, and it is recognized that the metal plate W is horizontal and a detection signal is emitted. Along with the buzzer.

At this point, the electromagnet 23 receives the detection signal and the power supply to the electromagnet 23 is stopped, and the attraction force with the scale plate 22 disappears.

The metal plate W is continuously pulled and becomes horizontal as shown in FIG. 5 (c). The scale plate 22 and the electromagnet 23 are slightly separated,
The pointer 24 slightly moves from the scale 0 to the plus scale side by a distance equal to this.

The metal plate W is stretched to the plastic deformation region, and the pointer 24 moves to the right in the drawing in synchronization with the tension clamp head 105 with respect to the stationary scale plate 22, as shown in FIG.

The worker previously attaches the proximity switch 25 to the position of the scale corresponding to the predetermined management extension amount, and the proximity switch 25
When the pointer 24 overlaps with, the proximity switch 25 sounds the buzzer and stops the movement of the pull side grip head 105.

When the tension side clamp head is returned to unclamp the processed metal plate W, the scale plate 22 is pushed back by the electromagnet 23 and at the same time the pointer 24 is scaled in the reverse order of FIG. 5 (c) → (b). 0, the elongation measuring means is in the initial state (5th
Return to FIG.

As shown in FIG. 5 (b), the metal plate horizontal recognizing means 10 despite the fact that the metal plate W still has some bending.
The feature of the present invention lies in the fact that the action of the action of the present invention allows the play of the detection lever 11 and the pin 13 to be allowed, and the adjustment of the limit switch 14 becomes extremely easy. This is because the point of action of the metal plate horizontal recognizing means 10 is separated from the strictly defined horizontal neutral line L ₁ .

In return for this ease, the operator obtains the moving distance data of the grip head 105 when the metal plate W is pulled from the reference line L ₂ to the horizontal neutral line L ₁ and the metal plate to be processed to this value. It is necessary to add the required growth amount of the above to the management growth amount. However, this addition work is possible at any time and does not burden the worker.

In addition, the scale plate 22 of the present embodiment is used for the tension side clamp head 1.
05, the pointer 24 and the electromagnet 23 are attached to the bed 101.
May be mounted on the side.

Further, the metal plate horizontal recognizing means 10 may be a non-contact device such as a photoelectric switch in addition to the contact method shown in the present embodiment. In short, the lower surface of the metal plate W is traced, and the lower surface is the reference line L _2.
Anything can be used as long as it can detect that the

Further, by arranging, for example, four metal plate horizontal recognizing means 10 in the plate width direction of the metal plate W and connecting these by an AND circuit, it is suitable for processing a wide metal plate.

(Effect of the Invention) As described above, according to the present invention, the metal plate horizontal recognizing means 10 horizontally certifies the metal plate W, and the amount of elongation is measured from this point, so that the variation at the start point of the counting is different. Lost.

Further, since the desired controlled elongation amount can be directly read by the elongation amount measuring means 20, the variation in the actual elongation amount becomes extremely small, and thus the product fractionation and the quality improvement are achieved. At the same time, the burden on the worker can be reduced and the work efficiency can be improved. Then, the extension amount measuring means for that purpose is a slider type scale plate similar to that of a conventional scale plate, a simple electromagnet provided on the pulling side grip head side, and a conventional pointer similarly provided on the pulling side grip head side. As a result, the elongation measuring means is extremely simple and inexpensive, and as a result, automation and unmanned measurement of the stretch leveler is greatly promoted.

[Brief description of drawings]

FIG. 1 is a front view of a stretcher leveler according to the present invention, and FIG.
The figure shows the principle of the metal plate horizontal recognizing means, FIG. 3 shows the principle of the elongation measuring means, FIG. 4 shows the AA arrow view of FIG. 3, and FIGS. FIG. 6 is a front view of a stretcher leveler according to a conventional example, FIG. 7 is a view showing a conventional scale plate, and FIGS. 8 (a) and 8 (b) are explanatory views of the same operation. 1 …… Stretch leveler 10 …… Metal plate horizontal recognition means 20 …… Extension measuring means 22 …… Slider type scale plate 23 …… Electromagnet 24 …… Indicator 101 …… Bed 102 …… Rail 103 …… Grip side grip head 105 ... Grip head on tension side W ... Metal plate

Claims (1)

[Claims] 1. A pair of grip heads moving along a rail on a bed grips both ends of a metal plate, and one of the pull-side grip heads is pulled to straighten the metal plate, and the gripped metal plate. While detecting the lower surface position of
Equipped with a metal plate horizontal recognizing means that emits a detection signal at a position where the metal plate shifts from the bent state to the horizontal state, and measures the moving distance of the pull side grip head from the time when the detection signal of the metal plate horizontal recognizing means is received In the stretcher leveler equipped with an extension amount measuring means, the extension amount measuring means includes a slider type scale plate that is movable in the pulling and returning directions of the pulling side grip head, and in synchronization with the pulling side grip head. An electromagnet that pushes back the slider-type scale plate when the head is returned, and adsorbs the slider-type scale plate when the head is pulled and that demagnetizes by receiving the detection signal of the metal plate horizontal recognition means. When the electromagnet is in contact with the slider type scale plate, it points to the zero point of the scale plate and is synchronized with the pull-side grip head. Stretcher leveler, which is composed of moving pointers.