JP2023030976A - shearing device - Google Patents

Abstract

To provide a shearing device which can shear a belt-like metal thin plate having a large plate thickness dimension while suppressing increases in the size and cost.SOLUTION: A shearing device includes a fixed blade 5, a movable blade 6, and a driving device 9 driving the movable blade 6, wherein the driving device 9 includes a first piston rod 10 connected to one side in a width direction of the movable blade 6, a second piston rod 11 connected to the other side in the width direction of the movable blade 6, and a hydraulic circuit 12 for operating the first piston rod 10 and the second piston rod 11, the movable blade 6 is connected to at least one of the first piston rod 10 and the second piston rod 11 by a loose joint, and is configured to push the hydraulic circuit 12 and the first piston rod 10 in a shear direction and stop them at a cut position of the movable blade 6, and then push the second piston rod 11 in the shear direction.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a shearing device for shearing a strip-shaped thin metal plate, and more particularly to a shearing device incorporated in a strip-shaped thin metal plate welding apparatus.

Conventionally, in order to connect the preceding sheet metal strip and the succeeding sheet metal strip, the preceding sheet metal strip is sheared at the trailing edge and the succeeding sheet metal strip is sheared at the leading edge to cut each other. There is known a welding device for butting and welding the edges of two (Patent Documents 1, 2, etc.).

FIG. 7 shows an example of a conventional belt-shaped sheet metal welding device 1, which includes a welding torch 2 and a shearing device 3. As shown in FIG. The shearing device 3 can be moved in the direction indicated by the arrow Y1 from the storage position shown in FIG. The welding torch 101 can perform welding by reciprocating in the arrow Y2 direction from the standby position in FIG.

A shearing device incorporated in this type of welding device is also called a shearing device, a shearing machine, etc. In general, as shown in schematic structures in FIGS. Equipped with a movable blade 6 provided on the head 4 and a hydraulic cylinder 7 provided on the shearing head 4 for moving the movable blade 6 up and down. shear. 8 shows the standby position and FIG. 9 shows the shearing position.

JP 2018-86686 A Japanese Patent Application Laid-Open No. 2018-39090

The above-mentioned conventional shearing device is equipped with a pressure boosting cylinder to increase the hydraulic pressure for operating the movable blade, and the rigidity of the shearing head that holds the fixed blade and the movable blade is increased. Suitable for thin plates.

However, adding an intensifying cylinder or increasing rigidity increases the size of the shearing device and increases the manufacturing cost.

SUMMARY OF THE INVENTION Accordingly, the main object of the present invention is to provide a shearing device capable of shearing a strip-shaped thin metal plate having a large plate thickness while suppressing an increase in size and cost.

In order to achieve the above object, a shearing device according to an aspect of the present invention is a shearing device comprising a fixed blade, a movable blade, and a driving device for driving the movable blade, wherein the driving device comprises the A first piston rod connected to one side in the width direction of the movable blade, a second piston rod connected to the other side in the width direction of the movable blade, and hydraulic pressure for operating the first piston rod and the second piston rod. and a circuit, wherein the movable blade is connected to at least one of the first piston rod and the second piston rod by a loose joint, and the hydraulic circuit pushes the first piston rod in a shear direction. After the second piston rod is stopped at the cutting position of the movable blade, the second piston rod is pushed out in the shearing direction. The aperture may be a variable aperture.

The first piston rod may be configured to reach a stroke end at the cutting position of the movable blade.

The hydraulic circuit includes a first oil passage that supplies hydraulic fluid that operates the first piston rod, and a second oil passage that branches off from the first oil passage and supplies hydraulic fluid that operates the second piston rod. , and a throttle interposed in the second oil passage.

The hydraulic circuit may further include a bypass oil passage that bypasses the throttle, and a check valve that is interposed in the bypass oil passage and prevents hydraulic oil from flowing to the second piston rod.

The shearing head has a U-shape including a first side portion and a second side portion extending in parallel, and a connecting portion connecting the first side portion and the second side portion. A positioning hole provided on the tip side of a side portion, and a third piston rod provided on the tip side of the second side portion so as to be retractable and capable of being inserted into the positioning hole, wherein the third piston rod is , may be configured to operate synchronously with said first piston rod.

According to the present invention, when the supply of hydraulic oil from the hydraulic circuit is started, first, one widthwise side of the movable blade operates in the shearing direction, and then the other widthwise side of the movable blade operates in the shearing direction. As a result, the shear load can be reduced by increasing the shear angle (rake angle) at the start of shearing.

In addition, until the first piston rod stops at the cutting position, the connection position between the second piston rod and the movable blade becomes the fulcrum, and the connection position between the first piston rod and the movable blade becomes the force point. Since the cutting edge of the movable blade between them becomes the point of action, it acts as a so-called second-class lever. Further, when the second piston rod is operated after the first piston rod stops, the connection position between the first piston rod and the movable blade becomes the fulcrum, and the connection position between the second piston rod and the movable blade becomes the force, Acts as a second-class lever. Therefore, a large shearing force can be obtained even if the hydraulic pressure for operating the first piston rod and the second piston rod is low.

1 is a front view showing a schematic structure of an embodiment of a shearing device according to the present invention; FIG. FIG. 2 is a front view showing a movable blade of the shearing device of FIG. 1; FIG. 3 is an enlarged view of a main part showing an enlarged loose joint portion of the movable blade in FIG. 2; 2 is a front view of the shearing device of FIG. 1 with the movable blade in the cutting position; FIG. Figure 2 is a front view of the shearing device of Figure 1 with the movable blade in a shearing position; Figure 2 is a plan view of the shearing device of Figure 1; FIG. 11 is a perspective view showing a conventional belt-like thin metal plate welding device; 1 is a front view showing a schematic configuration of a conventional shearing device; FIG. FIG. 9 is a front view showing the operating state of the shearing device of FIG. 8;

An embodiment of a shearing device according to the invention will now be described with reference to FIGS. 1 to 6. FIG.

FIG. 1 is a schematic configuration diagram showing one embodiment of a shearing device according to the present invention. 1 and 2, the shearing device 8 includes a fixed blade 5, a movable blade 6, and a driving device 9 that drives the movable blade 6. As shown in FIG. The driving device 9 includes a first piston rod 10 connected to one side in the width direction of the movable blade 6, a second piston rod 11 connected to the other side in the width direction of the movable blade 6, a first piston rod 10 and a second piston rod 11 connected to the other side in the width direction of the movable blade 6. a hydraulic circuit 12 for operating the two piston rods 11;

A fixed blade 5 and a movable blade 6 are attached to the shear head 4 . The shearing head 4 is formed in a U-shape having a first side portion 4a and a second side portion 4b extending in parallel and a connecting portion 4c connecting the first side portion 4a and the second side portion 4b. ing. A fixed blade 5 is fixed to the first side portion 4 a of the shear head 4 . The movable blade 6 is attached to the second side portion 4b of the shearing head 4 so as to be vertically movable. A first hydraulic cylinder 13 with a first piston rod 10 is attached to the second side 4 b of the shear head 4 . A second hydraulic cylinder 14 with a second piston rod 11 is also attached to the second side 4 b of the shear head 4 . The first piston rod 10 and the second piston rod 11 are provided in parallel.

The fixed blade 5 has a horizontal blade edge, and the movable blade 6 has an inclined blade edge. As shown in FIG. 2, a first pivot shaft 10a is inserted through a first shaft hole 6a formed on one side of the movable blade 6 in the width direction. A second pivot shaft 11a is inserted through a second shaft hole 6b formed in the movable blade 6 on the other side in the width direction. In the illustrated example, referring to FIG. 2, both the first shaft hole 6a and the second shaft hole 6b are elongated holes. Thereby, a predetermined play, which will be described later, is provided between the first shaft hole 6a and the first pivot shaft 10a and between the second shaft hole 6b and the second pivot shaft 11a. It is connected to the first piston rod 10 and the second piston rod 11 by loose joints.

In one embodiment, referring to FIG. 3, the outer diameter D of the first pivot shaft 10a and the second pivot shaft 11a is 10 mm, the length L of the first shaft hole 6a and the second shaft hole 6b is 12 mm, Width W is 10.1 mm.

The hydraulic circuit 12 includes a first oil passage 12a that supplies hydraulic oil to the first hydraulic cylinder 13, a second oil passage 12b that branches from the first oil passage 12a and supplies hydraulic oil to the second hydraulic cylinder 14, and a throttle 12c interposed in the second oil passage 12b. Aperture 12c is preferably a variable aperture. The operation timing of the first piston rod 10 and the second piston rod 11 can be adjusted by the variable throttle that constitutes the throttle 12 .

Further, the hydraulic circuit 12 includes a bypass oil passage 12d that bypasses the throttle 12c, and a flow of hydraulic oil to the second piston rod 11 through the bypass oil passage 12d. and a check valve 12e that blocks the flow and allows the hydraulic oil to flow in the opposite direction.

A first positioning metal fitting 15 is fixed to the tip of the first side portion 4 a of the shearing head 4 , and a second positioning metal fitting 16 is fixed to the tip of the second side portion 4 b of the shearing head 4 . A predetermined gap is provided between the first positioning metal fitting 15 and the second positioning metal fitting 16 . A third hydraulic cylinder 17 is incorporated in the second positioning fitting 16 . As shown in FIG. 1, the third piston rod 17a of the third hydraulic cylinder 17 is accommodated within the second positioning fitting 16 when the piston 17b is on the cylinder bottom side. On the other hand, as shown in FIGS. 4 and 5, the third piston rod 17a fits into the positioning hole 15a drilled in the bottom surface of the first positioning fitting 15 when the piston 17b is on the cylinder head side. Hydraulic oil to the third hydraulic cylinder 17 is supplied through a third oil passage 17c branched from the first oil passage 12a. The third oil passage 17c branches off from the first oil passage 12a on the upstream side of the branch point of the second oil passage 12d.

The operation of the shearing device 8 having the above configuration will now be described. FIG. 1 shows a state in which the movable blade 6 is in the standby position, and the movable blade 6 is in the lower end position and separated from the fixed blade 5 . At this time, hydraulic oil is drawn through the first oil passage 12a by an oil pump (not shown), and the pistons 13a and 14a of the first hydraulic cylinder 13 and the second hydraulic cylinder 14 are at the stroke end on the cylinder bottom side. position, the first piston rod 10 and the second piston rod 11 are retracted into the cylinder tubes 13b, 14b, respectively. Also, at this time, the piston rod 17 a is pulled into the second positioning metal fitting 16 and is buried in the second positioning metal fitting 16 .

When pressurized hydraulic fluid is supplied through the first oil passage 12a, the restrictor 12c restricts the flow of hydraulic fluid in the second oil passage 12b. is restricted, the first piston rod 10 is preferentially pushed out of the cylinder tube 13b. The first piston rod 10 is pushed out to a position where the piston 13a reaches the stroke end on the cylinder head side, and stops at the stroke end position. At the position where the first piston rod 10 reaches the stroke end and stops, as shown by 6 in FIG. In cutting position to shear. The first piston rod 10 may be stopped at the cutting position, and can be stopped before the stroke end.

Synchronously with the operation of the first piston rod 10, the third piston rod 17a inside the second positioning metal fitting 16 is operated, and the third piston rod 17a protrudes from the second positioning metal fitting 16 to move the positioning hole of the first positioning metal fitting 15. 15a. Thereby, the tips of the first side 4a and the second side 4b of the shearing head 4 are positioned relative to each other so that the clearance between the fixed blade 5 and the movable blade 6 does not change during shearing. Moreover, by fixing the tips of the first side portion 4a and the second side portion 4b of the shearing head 4 in this manner, the rigidity of the shearing head 4 is increased, and the thickness t (FIG. 6) of the shearing head 4 is reduced. It is possible to reduce the size of the entire device by making it thin.

When the first piston rod 10 is pushed out from the cylinder tube 13b, the second pivot shaft 11a serves as a fulcrum and the first pivot shaft 10a serves as a force, thereby actuating the movable blade 6 by the principle of the second type lever. In order to enable such operation, the play is provided between the first shaft hole 6a and the first pivot shaft 10a and between the second shaft hole 6b and the second pivot shaft 11a. , the movable blade 6, the first piston rod 10 and the second piston rod 11 are connected by loose joints. The amount of play is appropriately set according to the dimensions of the movable blade 6, the distance between the first shaft hole 6a and the second shaft hole 6b, the stroke lengths of the first piston rod 10 and the second piston rod 11, and the like.

By operating the movable blade 6 according to the second-class lever principle as described above, a large shearing force can be generated with a small working oil pressure. Further, since the first piston rod 10 operates in the shearing direction before the second piston rod 11 and reaches the stroke end, the shear angle increases and the shearing force increases.

When the first piston rod 10 reaches the stroke end, the hydraulic oil can no longer be supplied to the first hydraulic cylinder 13, so the hydraulic oil is supplied from the second oil passage 12b to the second hydraulic cylinder 14 through the throttle 12c. The 2-piston rod 11 is actuated, and the intersection of the fixed blade 5 and the movable blade 6 progresses to progress the shearing action. When the second piston rod 11 is pushed out from the cylinder tube 14b, the first pivot shaft 10a serves as a fulcrum and the second pivot shaft 11a serves as a force point, thereby shearing the movable blade 6 by the second type lever principle. Since the shear angle increases when the second piston rod 11 starts to operate, a large shearing force can be obtained.

When the movable blade 6 is returned to the standby position after shearing, hydraulic oil is withdrawn from the first hydraulic cylinder 13 and the second hydraulic cylinder 14. Hydraulic oil is smoothly withdrawn from the hydraulic cylinder 14, and the movable blade 6 can be quickly returned to the standby position.

According to the present invention, the movable blade 6 employs a driving device that utilizes the second-class lever principle, so that the shearing force can be strengthened without increasing the size of the shearing device.

The present invention should not be construed as being limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

For example, in the illustrated example, the fixed blade is arranged above and the movable blade is arranged below, but it is also possible to arrange the movable blade above and the fixed blade below. Also, only the first piston rod 10 can be connected to the movable blade 6 by a loose joint, or only the second piston rod 11 can be connected to the movable blade 6 by a loose joint. Also, in place of the throttle 12c, a control valve such as an open/close control valve or a directional switching valve is used to provide a hydraulic oil path for operating the first piston rod 10 and a hydraulic oil path for operating the second piston rod 11. By switching between and, the first piston rod 10 is pushed out to the stroke end and stopped at the cutting position, and then the control valve is controlled so that the strip-shaped thin metal plate is sheared by the operation of the second piston rod 11. Also, although the first positioning fitting and the second positioning fitting are separately fixed to the shearing head in the illustrated example, they may be integrated with the shearing head as part of the shearing head.

4 shearing head 5 fixed blade 6 movable blade 8 shearing device 9 driving device 10 first piston rod 11 second piston rod 12 hydraulic circuit 12a first oil passage 12b second oil passage 12c throttle 12d bypass oil passage 12e check valve 13 second 1 hydraulic cylinder 14 2nd hydraulic cylinder 15 1st positioning metal fitting 16 2nd positioning metal fitting 17 3rd hydraulic cylinder 17a 3rd piston rod

In order to achieve the above object, a shearing device according to an aspect of the present invention is a shearing device comprising a fixed blade, a movable blade, and a driving device for driving the movable blade, wherein the driving device comprises the A first piston rod connected via a first pivot shaft inserted through a first shaft hole formed on one side in the width direction of the movable blade, and provided to operate in parallel with the first piston rod. A second piston rod connected via a second pivot shaft inserted through a second shaft hole formed on the other side in the width direction of the movable blade, and operating the first piston rod and the second piston rod and a hydraulic circuit, wherein at least one of the first shaft hole and the second shaft hole has a clearance with at least one of the first pivot shaft and the second pivot shaft. The movable blade is connected to at least one of the first piston rod and the second piston rod by a loose joint, and the hydraulic circuit is connected to the After the first piston rod is pushed out in the shearing direction and stopped at the cutting position of the movable blade, the second piston rod is pushed out in the shearing direction. The aperture may be a variable aperture.

The first piston rod is configured to reach a stroke end at the cutting position of the movable blade, and the hydraulic circuit includes a first oil passage for supplying hydraulic oil for operating the first piston rod; a second oil passage that branches off from the first oil passage and supplies hydraulic oil for operating the second piston rod; a throttle interposed in the second oil passage ; a bypass oil passage that bypasses the throttle; a check valve that is interposed in the bypass oil passage and blocks the flow of hydraulic oil to the second piston rod, and when shearing is performed, the second oil passage is operated by the restriction due to the supply of hydraulic oil. The first piston rod is preferentially pushed out in a state where the flow of oil is restricted and the operation of the second piston rod is restricted, and the first piston rod reaches the stroke end at the cutting position of the movable blade. , the hydraulic oil can no longer be supplied to the first hydraulic cylinder, and hydraulic oil is supplied from the second oil passage to the second hydraulic cylinder through the throttle, and the second piston rod operates and is pushed out. After shearing, hydraulic fluid may be drawn from the first hydraulic cylinder through the first oil passage, and hydraulic oil may be drawn from the second hydraulic cylinder through the bypass oil passage.

The operation of the shearing device 8 having the above configuration will now be described. FIG. 1 shows a state in which the movable blade 6 is in the standby position, and the movable blade 6 is in the lower end position and separated from the fixed blade 5 . At this time, hydraulic oil is drawn through the first oil passage 12a by an oil pump (not shown), and the pistons 13a and 14a of the first hydraulic cylinder 13 and the second hydraulic cylinder 14 are at the stroke end on the cylinder bottom side. position, the first piston rod 10 and the second piston rod 11 are retracted into the cylinder tubes 13b, 14b, respectively. Also, at this time, the third piston rod 17 a is pulled into the second positioning metal fitting 16 and is buried in the second positioning metal fitting 16 .

When pressurized hydraulic fluid is supplied through the first oil passage 12a, the restrictor 12c restricts the flow of hydraulic fluid in the second oil passage 12b. is restricted, the first piston rod 10 is preferentially pushed out of the cylinder tube 13b. The first piston rod 10 is pushed out to a position where the piston 13a reaches the stroke end on the cylinder head side, and stops at the stroke end position. At the position where the first piston rod 10 reaches the stroke end and stops, as shown in FIG. In cutting position for shearing. The first piston rod 10 may be stopped at the cutting position, and can be stopped before the stroke end.

Claims (6)

A shearing device comprising a fixed blade, a movable blade, and a driving device for driving the movable blade,
The drive device includes a first piston rod connected to one side in the width direction of the movable blade, a second piston rod connected to the other side in the width direction of the movable blade, the first piston rod and the second piston rod. a hydraulic circuit for actuating the piston rod,
The movable blade is connected to at least one of the first piston rod and the second piston rod by a loose joint,
The hydraulic circuit is configured to push out the first piston rod in the shearing direction and stop it at the cutting position of the movable blade, and then push out the second piston rod in the shearing direction.
Said shearing device. 2. A shearing device according to claim 1, wherein said first piston rod is configured to reach a stroke end at said cutting position of said movable blade. The hydraulic circuit includes a first oil passage that supplies hydraulic fluid that operates the first piston rod, and a second oil passage that branches off from the first oil passage and supplies hydraulic fluid that operates the second piston rod. , and a restriction interposed in the second oil passage. 4. The hydraulic circuit according to claim 3, further comprising a bypass oil passage that bypasses the throttle, and a check valve that is interposed in the bypass oil passage and prevents hydraulic oil from flowing to the second piston rod. A shearing device as described. 5. A shearing device according to claim 3 or 4, wherein the restriction is a variable restriction. The shearing head has a U-shape including a first side portion and a second side portion extending in parallel, and a connecting portion connecting the first side portion and the second side portion. a positioning hole provided on the tip side of a side portion; and a third piston rod provided protrusively and retractably on the tip side of the second side portion and capable of being fitted into the positioning hole, the third piston rod A shearing device according to any one of the preceding claims, wherein is arranged to operate synchronously with said first piston rod.

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