JPH0451930Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a shear angle adjusting device for a shearing machine.

Conventional technology In shearing work using a shearing machine,
The shear angle is closely related to the accuracy of the material to be cut after cutting, that is, the straightness, torsion, and bow-like warpage, and it is desirable that the shear angle be as small as possible.

Therefore, as shown in Japanese Patent Publication No. 52-49588, a shear angle adjusting device is known which improves the deformation accuracy of the material to be cut by changing the shear angle according to the thickness and material of the material to be cut. .

In addition, as shown in Japanese Utility Model Publication No. 60-29369, the first and second switches are turned on and off using a dot that swings depending on the posture of the upper blade, and based on this, the left and right cylinders supporting the upper blade are turned on and off. A device is known that adjusts the shear angle by supplying pressure oil.

Problems to be Solved by the Invention The former device has problems such as high cost and troublesome piping because it includes a large number of switching valves.

With the latter device, in order to change the shear angle, it is necessary to manually move the first and second switches relative to the dock, which is cumbersome and difficult to set accurately to a predetermined shear angle. difficult to do.

Means to solve the problem A left cylinder and a right cylinder are respectively connected to the left and right sides of the upper blade which is long in the left and right direction and faces the lower blade, and the raising chamber of the left cylinder and the lowering chamber of the right cylinder are connected to each other by a conduit. The pipe line can be connected to either the hydraulic power source or the drain line via a solenoid valve and can be controlled. One end is oscillated in one direction when the shear angle of the upper blade is larger than a predetermined value,
If it is small, it is connected so as to swing in the other direction, and a first gear is rotatably provided around the pin, and a mounting plate provided with a first and second switch is provided on this first gear, and the The other end of the swinging rod has a dog opposite to the first and second switches, and when the swinging rod swings in one direction, the first switch is turned on.
When the switch swings in the other direction, the second switch is turned on, and when the first switch is turned on, the solenoid valve is placed in a position where the hydraulic pressure source and the pipe are connected, and when the second switch is turned on, the solenoid valve is placed in a position where the drain line and the pipe are connected. The first
The gear is connected to a motor provided on the stationary side via a second gear, the first gear is connected via a third gear to a rotation detector that detects rocking of a mounting plate provided on the stationary side, and the a calculation storage circuit that calculates and stores the shear angle based on the detection signal of the rotation detector; and a shear angle change command that drives the motor so that the commanded shear angle from the shear angle change knob and the calculated and stored shear angle become the same. It is equipped with an arithmetic circuit, which allows the shear angle to be accurately adjusted to the commanded shear angle using the shear angle change knob.

Embodiment FIG. 1 is an overall front view, in which the upper blade 1 is moved up and down with respect to the lower blade 4 by a pair of left and right cylinders 2 and 3, and the lower surface 1a is inclined with respect to the upper surface 4a of the lower blade 4. forming a shear angle α.

In the left cylinder 2, a piston 7 having a piston rod 6 is inserted into a cylinder tube 5 to form a lowering chamber 2a and a raising chamber 2b, and the piston rod 6 is connected to the upper blade 1 and is connected to the upper blade upper surface 1b and the cylinder tube. Upper blade upper limit stopper 8 between
is provided.

The right cylinder 3 has a piston 11 equipped with a piston rod 10 inserted into a cylinder tube 9 to form a lower chamber 3a and a higher chamber 3b.
The raising chamber 3b is open to the atmosphere.

Further, a rod 13 is fitted into a bracket 12 fixed to each cylinder tube 5, 9.
3 are respectively connected to the upper blade 1 and biased upwardly by a spring 14.

The lowering chamber 2a of the left cylinder 2 is connected to either a hydraulic power source 15 or a drain by a solenoid valve (not shown), and the hydraulic power source 16 is connected to the raising chamber 2b of the left cylinder 2 and the lowering chamber of the right cylinder 3 via a solenoid valve 17. It is interrupted by a conduit 18 communicating with 3a.

In other words, the solenoid valve 17 is connected to the discharge path 1 of the hydraulic power source 16.
6a and the pipe line 18 is held at a neutral position N where it communicates with the drain line 19, and the first solenoid A
When the second solenoid B is energized, the check valve 2 in which the discharge passage 16a is connected to the conduit 18 is set to the first position I, and when the second solenoid B is energized, the check valve 2 in which the discharge passage 16a is connected to the conduit 18 is placed in the first position I.
0 to the pilot line 21 and the line 18 to the drain line 19. 22 and 23 are a discharge path 16a and a drain path 19
This is a variable throttle valve installed in the

Since this is the case, the lowering chamber 2a of the left cylinder 2 is connected to the drain by a solenoid valve (not shown).
When the solenoid valve 17 is in the neutral position N, the spring 14
As a result, the upper blade 1 moves upward via the rod 13 and comes into contact with the upper blade upper limit stopper 8.

Furthermore, when a solenoid valve (not shown) is switched to supply pressure oil from the hydraulic source 15 to the lowering chamber 2a of the left cylinder 2, the pressure oil in the raising chamber 2b is supplied to the lowering chamber 3a of the right cylinder 3 via the pipe line 18. Therefore, the upper blade 1 descends.

That is, the vertical movement of the upper blade 1 during normal shearing work is performed only by the hydraulic power source 15.

Reference numerals 24 and 25 designate first and second switches, which are turned on and off by a dot 27 provided on a swinging rod 26 that is swinged up and down by the upper blade 1.

In other words, as shown in FIG. 2 and FIG.
A roller 30 provided at one end of the roller 30 is fitted into a bifurcated yoke 31 provided on the upper blade 1, and a mounting plate 32 swingably provided on the pin 29. First and second switches 24, 25
is fixedly installed, and its switch pieces 24a, 25a face a dot 27 fixed to the other end of the swinging rod 26 with a bolt 37, and a first gear 38 is rotatably provided on the pin 29. The motor 3 has the second gear 39 meshed with the first gear 38 fixed to the housing 28.
6 via a speed reducer 33, and a third gear 34 meshed with the first gear 38 is connected to a rotation detector 35 such as a lens encoder or a potentiometer.

Note that the first gear 38 and the mounting plate 32 are connected to each other so that they rotate together around the pin 29.

FIG. 4 shows an electric circuit in which first and second switches 24, 25, first and second relays 40, 41, upper limit switch 42, and normally closed contact 43 are connected in series, and the first relay 40 is normally closed. The open contact 40a and the normally closed contact 41b of the second relay 41 are connected in series with the first solenoid A, and the normally closed contact 40b of the first relay 40 and the normally closed contact 41a of the second relay 41 are connected to the second solenoid A.
It is connected in series with solenoid B.

FIG. 5 is a shear angle changing circuit diagram, in which the detection signal _R1 of the rotation detector 35 is input to the calculation storage circuit 51 of the control device 50, and the first and second switches 24,
25, that is, the shear angle α, is calculated and stored, the shear angle α is digitally displayed on the display section 53 of the operation panel 52, and is input to the shear angle change command calculation circuit 54 of the control device 50, The command shear angle α 1 from the shear angle change knob 55 of the operation panel 52 is calculated, and a forward/reverse rotation command is output to the motor 36 based on |α−α _{1 |} to set the command shear angle α ₁
and the shear angle α detected by the rotation detector 35 are always made to match.

The motor 36 is equipped with a brake to prevent it from moving due to vibrations after the shear angle is set, and the mounting plate 32 may be rotated by a cylinder with a locking mechanism instead of the motor.

Further, the command shear angle α ₁ may be automatically input according to the thickness and material of the plate material to be cut, or when the push button is pressed, the motor 36 continuously rotates and the detected value of the rotation detector 35 is inputted automatically. Based on this, the operator may visually check the shear angle α displayed on the display unit 53 and release the push button when the desired shear angle is reached.

Further, the shear angle may be displayed in an analog manner on the display section 53.

Therefore, as described above, the solenoid valve 17 is set to the neutral position N, and the left cylinder 2 is operated by the solenoid valve (not shown).
Connect the lowering chamber 2a to the drain, bring the upper blade 1 into contact with the upper blade upper limit stopper 8, and turn the upper limit switch 42.
In the ON state, if the shear angle α is a predetermined value, the inclination of the upper blade 1 will be a predetermined value and the first and second switches 24 and 25 will be turned OFF, so the first and second relays 40 , 41 are not energized, their normally open contacts 40a and 41a are open, and their normally closed contacts 40b and 41b are closed, so the first and second solenoids A and B are not energized and the solenoid valve 17 is at the neutral position N. It's summery.

Further, when the shear angle α is larger than a predetermined value, the swinging rod 26 swings clockwise about the pin 29 and the dock 27 moves downward, so that the first switch 24 is turned on.

As a result, the first relay 40 is energized, its normally closed contact 40b is opened, and its normally open contact 40a is closed, so the first solenoid A is energized, the solenoid valve 17 is in the first position, and the discharge pressure of the hydraulic source 16 is Oil is in the raising chamber 2b of the left cylinder 2 and the lowering chamber 3a of the right cylinder 3.
is fed, the upper blade 1 is downward to the right, and the shear angle α is
is made smaller, the swinging rod 26 is swung counterclockwise, and the dock 27 is moved upward.

When the shear angle α reaches a predetermined value, the dock 27 and the switch piece 24a of the first switch 24 are separated and turned OFF, so that the solenoid valve 17 returns to the neutral position N and the shear angle α becomes a predetermined value.

Further, when the shear angle α is smaller than a predetermined value, the second switch 25 is turned on, the second relay 41 is energized, the second solenoid B is energized, and the solenoid valve 1 is energized.
7 becomes the second position and the check valve 20 is opened,
The pressure oil in the raising chamber 2b of the left cylinder 2 and the pressure oil in the lowering chamber 3a of the right cylinder 3 flow out into the drain passage 19 through the check valve 20, and the upper blade 1 moves downward to the left, so that the shear angle α is When the value increases to a predetermined value, the solenoid valve 17 returns to the neutral position N in the same manner as described above.

In this way, the shear angle α can always be kept constant.

In other words, the shear angle α is determined by the sum of the oil amount in the raising chamber 2b and lowering chamber 3a of the left and right cylinders 2 and 3 and the oil amount in the pipe line 18, and as the oil amount increases, the shear angle α becomes smaller. , if the oil amount decreases, the shear angle α
becomes larger.

Note that the check valve 20 is provided to reduce oil leakage and reduce the number of shear angle corrections.

Further, by swinging the mounting plate 32 and moving the first and second switches 24 and 25 up and down with respect to the dock 27 as described above, the shear angle α can be changed and adjusted, and the position of the mounting plate 32 can also be adjusted. Since the position can be accurately determined using the detection signal from the rotation detector 35, the shear angle can be accurately adjusted to a predetermined value.

Effects of the invention The present invention is as described above, and the shear angle α can be maintained at a predetermined value.

In addition, the displacement of the upper blade 1 is determined by the swinging rod 26 and the dot 27.
This is detected by the first or second switch 24, 25, and the solenoid valve 17 is switched accordingly, so the displacement of the upper blade 1 can be detected mechanically, preventing malfunction, and always keeping the shear angle α constant. Can be maintained at a predetermined value.

Also, since the left cylinder 2 and right cylinder 3 are moved in opposite directions up and down, the amount of displacement of the upper blade 1 is larger compared to the strokes of the left and right cylinders 2 and 3, making it possible to quickly adjust and change the shear angle α. .

Further, by rotating the first gear 38 equipped with the mounting plate 32 with the motor 36, the mounting plate 32 is oscillatedly displaced, and the first and second switches 24, 25 and the dock 27 are connected to each other.
The shear angle α can be changed and adjusted by changing the relative position between the rotation detector 35 and the shear angle α, and the adjustment operation is simple as it only requires driving the motor 36. Furthermore, the shear angle α can be calculated and adjusted using the detection signal from the rotation detector 35. 51, and the motor 3 is operated by the shear angle change command calculation circuit 54 until this shear angle α and the command shear angle α ₁ from the shear angle change knob 55 become the same.
6, the shear angle α can be accurately adjusted to the commanded shear angle α ₁ from the shear angle change knob 55.

[Brief explanation of the drawing]

Fig. 1 is an overall view showing an embodiment of the present invention, Fig. 2 is a longitudinal cross-sectional view of the switch portion, Fig. 3 is a cross-sectional view,
FIG. 4 is an electric circuit diagram, and FIG. 5 is a control circuit diagram. 1 is an upper blade, 2 and 3 are left and right cylinders, 2b is a raising chamber, 3a is a lowering chamber, 17 is a solenoid valve, and 24 and 25 are first and second switches.

Claims (1)

[Scope of utility model registration request] A left cylinder 2 and a right cylinder 3 are respectively connected to the left and right sides of the upper blade 1 which is long in the left and right direction and faces the lower blade 4, and the raising chamber 2b of the left cylinder 2 and the lowering chamber 3a of the right cylinder are connected to the conduit 18. Connect this conduit 1 to
8 can be connected to either the hydraulic power source 16 or the drain path 19 via a solenoid valve 17 for control, and the upper blade 1 has a swinging rod 26 supported on the fixed side by a pin 29 so as to be able to swing vertically. One end is connected so that it swings in one direction when the shear angle α of the upper blade 1 is larger than a predetermined value, and swings in the other direction when it is smaller. A first gear 38 is rotatably provided, and the first gear 38 has first and second gears.
A mounting plate 32 equipped with switches 24 and 25 is provided,
A dog 27 facing the first and second switches 24 and 25 is provided at the other end of the swinging rod 26, and when the swinging rod 26 swings in one direction, the first switch 24 is activated.
When it turns on and swings in the other direction, the second switch 25
When the first switch 24 is turned on, the solenoid valve 17 is placed in a position where the hydraulic source 16 and the pipe line 18 are communicated with each other, and when the second switch 25 is turned on, the solenoid valve 17 is placed in a position where the drain line 19 and the pipe line 18 are communicated with each other. The first
Rotation detection that connects the gear 38 to the motor 36 provided on the fixed side via the second gear 39 and detects the swing of the mounting plate 32 provided on the fixed side via the first gear 38 and the third gear 34. A calculation storage circuit 51 is connected to the rotation detector 35 and calculates and stores the shear angle α based on the detection signal of the rotation detector 35, and calculates and stores the command shear angle α ₁ from the shear angle change knob 55 and the calculated and stored shear angle. A shear angle adjustment device for a shearing machine, comprising a shear angle change command calculation circuit 54 which inputs α and drives a motor 35 based on |α−α ₁ | so that α ₁ =α.