JP2000263317A - Reverse plate holding device for shearing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make maintenance easy, reduce air consumption drastically, and lower maintenance cost. SOLUTION: A fixed blade 9 is provided on a table 7, a reverse plate holding member 25 free to move is provided next to the fixed blade 9, a moving blade 11 more free to move is provided on a ram 13 as opposite to the reverse plate holding member 25, and an air cylinder with a brake 27 having the reverse plate holding member 25 longer than a machining stroke is provided. An air controlling circuit 29 working the air cylinder with the brake 27 is provided, a solenoid selector valve for lifting 49 with outflow controlling function controlling an outflow of air from a pushing chamber 45 of the air cylinder with the brake 27 at the time of lowering the ram 13 is provided in the air controlling circuit 29. Therefore, by accumulating the air without emitting the air every time, air consumption is drastically reduced and maintenance cost becomes cheaper.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reverse plate press of a shearing machine.

[0002]

2. Description of the Related Art When air pressure is used to drive a reverse plate pressing device of a shearing machine, a method of always using the full stroke of the air cylinder is used, although it is a general use of an air cylinder.

[0003] For example, FIG.
The air circuit 115 for driving the air cylinder 105 has an air source 117, a pressure control valve, and a main structure including a reverse plate holding member 103, an air cylinder 105, a table 107, a lower blade 109, an upper blade 111, and a ram 113. 12
1, an electromagnetic switching valve 123, and a silencer 129.

[0004] With the above configuration, first, the air cylinder 1
The air supply to the push-up chamber 125 of FIG. 05 is continued, and the reverse plate holding member 103 is made to stand by at the upper limit, and the upper blade 111 descending for processing is pressed against the pressure set by the pressure control valve 121. After the pressing member 103 is pressed down, and the upper blade 111 reaches the lowering end, the electromagnetic switching valve 123 is switched and the pressing down chamber 1 is switched.
27, the reverse plate holding member 103 is lowered to the lower limit end, and after a certain time, the electromagnetic switching valve 123 is switched to supply air to the push-up chamber 125, and the reverse plate holding member 103 is supplied.
To prepare for the next step.

[0005] A hydraulic reverse plate retainer disclosed in Japanese Utility Model Publication No. 3-44424 is also known.

[0006]

By the way, in the above-described conventional reverse plate presser 101, when the air used to raise the air cylinder 105 is released to the atmosphere via the silencer 129 when the air cylinder 105 is lowered, the processing is performed. In each process, it is necessary to supply compressed air for one stroke, and the air cylinder 105 of the reverse plate retainer has a longer stroke than a plate retainer or the like, so that the air consumption is large and the capacity of the compressor is increased. There is a need.

Further, as shown in Japanese Utility Model Publication No. 3-44424, when hydraulic pressure is used for holding the reverse plate, there is a problem that the cost is high and maintenance such as oil leakage is required extra. Was.

An object of the present invention is to provide a reverse plate holding device of a shearing machine which facilitates maintenance and greatly reduces air consumption.

[0009]

According to a first aspect of the present invention, there is provided a reverse plate holding device for a shearing machine for shearing a plate material by cooperation of a fixed blade and a movable blade provided on a ram. In the reverse plate holding device of the shearing machine, the air cylinder that drives the reverse plate holding member is an air cylinder with a brake having a stroke length longer than the ram machining stroke, and a regulator that sets the air pressure to a predetermined pressure from an air source, A first conduit connecting the regulator and the air cylinder is provided, and the first conduit is branched and one is connected to the air cylinder push-up chamber and the other is connected to the air cylinder push-down chamber, and the first conduit is connected to the first cylinder. A second switching valve, which is provided with a first switching valve that can be switched in one of the push-up chamber and the push chamber, and controls on / off operation of a cylinder brake , A second conduit connecting the regulator and the regulator is provided, and a control unit for performing on / off control of the first and second switching valves is provided. The control unit seals air in the push-up chamber at least when the ram is lowered, Each switching valve is controlled so as to turn on the air cylinder brake in response to a detection signal indicating that the ram has reached the lowering end, and to turn off the cylinder brake after the ram has started moving up.

According to a second aspect of the present invention, there is provided a reverse plate holding device for a shearing machine for shearing a plate material by cooperation of a fixed blade and a movable blade provided on a ram. Is an air cylinder with a brake having a stroke length longer than the ram machining stroke, a regulator for setting the air pressure from an air source to a predetermined pressure, and a first conduit connecting the regulator and the air cylinder lifting chamber. And a second pipe connecting the regulator and the air cylinder press chamber, and a third pipe connected to the regulator and the air cylinder brake unit, and the first pipe turns on / off air supply to the push-up chamber. A second switching valve for controlling on / off operation of an air cylinder brake in a third pipeline. A second regulator provided at a low pressure and a third switching valve for turning on and off the air supply to the pressing chamber, and a control unit for performing on / off control of each switching valve. The control unit seals the air in the push-up chamber at least when the ram descends, turns on the air cylinder brake in response to the detection signal that the ram has reached the descending end, and turns off the cylinder brake after the ram turns up. In addition, each switching valve is controlled.

According to the first aspect of the invention, an air cylinder with a brake is used, and when the movable blade is lowered, the air in the upper chamber of the air cylinder with the brake is closed with the first switching valve closed. Then, the position is fixed at the brake part of the air cylinder with brake, the movable blade is returned to the top dead center,
The cut plate material is released.

Conventionally, air for one stroke was required in the air cylinder, but this air consumption can be greatly reduced and the capacity of the pneumatic source can be reduced.

According to the second aspect of the present invention, in the air control circuit according to the first aspect, a third switching valve is provided in a second conduit communicating with a pressing chamber of an air cylinder with a brake. In addition to the effect described in the first aspect, the operation is such that only a low pressure of about 1/2 to 1/5 of the predetermined pressure is applied to the press-down chamber of the air cylinder with brake.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First, the overall configuration of the shearing machine will be schematically described for easy understanding.

The shearing machine 1 shown in FIG. 4 is a general one provided with a ram 13 having a fixed blade 9 and a movable blade 11 for cooperating with the fixed blade 9 to vertically move. Reference numeral 15 denotes a back gauge device for setting a shear width of the plate material W, and reference numeral 21 denotes a plate pressing device.

A dog 17 is provided at an appropriate position on the ram 13, and a detector 19A for detecting the top dead center of the ram 13 and a detector 19B for detecting the bottom dead center of the ram 13 by the dog 17.
Is provided.

When the fixed blade 9 and the movable blade 11 are subjected to shearing processing, in order to support the plate material W from below in opposition to the movable blade 11, a reverse plate press is provided adjacent to the fixed blade 9 provided on the table 7. A device 23 is provided. A plurality of the reverse plate pressing devices 23 are provided in the left-right direction along the rear surface of the fixed blade 9 so as to support the plate material W from below facing the movable blade 11.

Next, a detailed description will be given of a reverse plate holding device 23 and an air control circuit 29 for operating the reverse plate holding device 23, which are main components of the embodiment of the present invention.

Referring to FIG. 1, the reverse plate holding device 23 includes:
As described above, the movable blade 11 is provided adjacent to the fixed blade 9 fixed to the table 7 and includes a reverse plate pressing member 25 and an air cylinder 27 with a brake. It is provided in. This ram 1
3 are provided with detectors 19A and 19B (for example, limit switches) for detecting the vertical movement end of the
A control unit 31 for inputting the detection signals of A and 19B is provided. The control unit 31 is provided with a timer 33 for controlling ON / OFF of solenoids of each electromagnetic switching valve described later.

The air control circuit 29 is provided with a high pressure regulator 39 which can be set to a predetermined pressure via a check valve 37 on the discharge side of an air source 35 which is a compressor. And a second conduit 43 are provided. The first conduit 41 communicates with the conduit 51 leading to the push-up chamber 45 of the air cylinder 27 with brake or the push-down chamber 47 of the air cylinder 27 with brake via an ascending electromagnetic switching valve 49 as a first switching valve. It is connected to a pipe 55 so as to be switchable.
A throttle valve 53 with a check valve is provided in the middle of the pipes 51 and 55. 57 is a muffler. When the SOL1 is ON, the first line 41 is connected to the line 5
1, the first pipe 41 is connected to the pipe 55 in the OFF state.
It is supposed to lead to.

The second conduit 43 communicates with a brake portion 59 of the air cylinder 27 with a brake, and an electromagnetic switching valve 61 for a brake as a second switching valve is provided in the middle of the second conduit 43. ing. It is to be noted that the brake of the brake section 59 is operated when the SLO3 provided in the electromagnetic switching valve 61 for a brake is ON. Also,
A muffler 57 is provided at each of the exhaust-side T ports. Further, reference numeral 69 denotes a piston rod.

The operation of the air cylinder 2 with a brake of the reverse plate holding device 23 will be described with reference to FIGS. 2 (A) to 2 (D) and FIG.
7A is in the position shown in FIG. 2A, SOL1 of the ascending electromagnetic switching valve 49 is turned on by a signal from the control unit 31.
Then, the P port and the A port of the ascending electromagnetic switching valve 49 are communicated with each other, air is supplied into the push-up chamber 45, and the pressurizing chamber 45 is kept in a standby state while being pressurized. In this case, SOL3 of the electromagnetic switching valve for brake 61 is turned off, and the electromagnetic switching valve for brake 6 is turned off.
The brake section 59 is opened by connecting the P port and the B port of the first port.

Next, the state shown in FIG. 2B is a state in which the cutting process is performed and the ram 13 is at the lower end. While the ram 13 is descending, SOL1 is OFF and the first pipe is in a closed state, so that the air in the push-up chamber 45 is compressed and the pressing force increases. Further, the air is supplied from the P port to the B chamber through the throttle valve 53 with a check valve so that the air in the pressing chamber 47 does not become negative pressure.

Next, the state shown in FIG.
That is, when the movable blade 11 reaches the bottom dead center in the state shown in FIG. 2B described above, the control unit 31 that has received a signal from the detector 19B that detects the bottom dead center of the ram 13 is used for the brake. SOL3 of the electromagnetic switching valve 61 is turned ON. The brake portion 59 applies a brake to the piston rod 69 through the P port and the A port of the brake electromagnetic switching valve 61 to stop the reverse plate pressing member 25 at that position.

In this state, the movable blade 11 releases the cut plate material W by raising the ram 13, and the ram 13 returns to the top dead center. In FIG. 2C, the reverse plate holding member 25 is indicated by a dotted line, and the position of the dotted line is a conventional state and is shown for reference.

FIG. 2D shows a process in which the reverse plate presser 25 is being raised. When a certain period of time has elapsed from the timer 33 started by turning on SOL3, SOL3 of the electromagnetic switching valve 61 for brake is turned off. Accordingly, when the brake is released, the air is accumulated in the push-up chamber 45, so that the reverse plate holding member 25 is raised without supplying air.

SOL1 of the ascending electromagnetic switching valve 49 is OFF.
(P port and B port communicate with each other, A port is plugged), the set pressure of the high pressure regulator 39 is also applied to the push chamber 47, and the pressure in the push chamber 45 is also increased by the piston rod 69.
As the pressure rises, the pressure becomes closer to the set pressure. However, since the sectional push-up chamber 45 of the piston rod 69 is wide, the piston rod 69 rises to near the rising end.

Further, when the detector 19A for detecting the rising end of the ram 13 detects, the SOL1 of the ascending electromagnetic switching valve 49 is turned ON, so that the set pressure is applied only to the push-up chamber 45, and the piston rod 69 is completely lifted. . In addition, FIG.
ON and O of SOL1 and SOL3 during the operation of (D)
The FF is as shown in FIG.

In the conventional example, the air consumed in the cutting step as described above is Q ₁ = air consumption A = piston area S ₁ = stroke P ₁ = air pressure, Q
A _{1 = 2 × A × S 1} × P 1 ( round trip).

In the embodiment of the present invention, if Q ₂ = air consumption A = piston area S ₁ = shear stroke P ₂ = low pressure side pressure, Q ₂ = A × S ₂ × P
It becomes ₂ .

That is, P ₂ / P ₁ = 1/5 S ₂ / S
_When used at ₁ = 1/2,

(Equation 1) And the air consumption is 1/20.

By releasing the cut plate material W without escaping the supply air in a series of operations in the cutting process by the above-described operation, the air supply is suppressed to a very low level and the air consumption is greatly reduced. In addition, the capacity of the compressor can be reduced, and the maintenance cost can be reduced by using air pressure.

FIG. 5 shows another embodiment of the air control circuit of the present invention. This embodiment is different from the above-described embodiment in that a pipe leading to the pressing chamber 47 of the air cylinder 27 with brake is provided independently. The description will be omitted, and only different parts will be described in detail.

The air control circuit 29 is provided with a high-pressure regulator 39 which can be set to a predetermined pressure on the discharge side of the air source 35 which is a compressor. A conduit 73 and a third conduit 75 are provided. The first pipe line 71 is connected to the air cylinder 27 with the brake via the electromagnetic switching valve 77 for raising.
Can be freely communicated with a pipeline 79 communicating with the push-up chamber 45.

When SOL1 of the ascending electromagnetic switching valve 77 is turned on, the P port communicates with the A port and the line 79
Through the throttle valve 53 with a check valve on the way to the push-up chamber 45 of the air cylinder 27 with brake.

The second conduit 73 communicates with the press chamber 47 of the air cylinder 27 with brake, and a lowering electromagnetic switching valve as a third switching valve is provided in the middle of the second conduit 73 via a low-pressure regulator 81. It communicates with the 83 P port. Then, SOL2 of the descending electromagnetic switching valve 83 is turned off.
In this case, the P port communicates with the A port, and when SOL2 is ON, the A port communicates with the T port and is exhausted from the silencer 57, and the P port is plugged.

The A port of the descending electromagnetic switching valve 83 is connected to a pipe 85 communicating with the press chamber 47 of the air cylinder 27 with brake. A throttle valve 53 with a check valve is provided in the middle of the pipe 85. .

The third conduit 75 communicates with the brake section 59 of the air cylinder 27 with a brake, and is connected to the third conduit 7.
In the middle of 5, an electromagnetic switching valve 61 for brake is provided as a second switching valve. When the SOL 3 provided in the electromagnetic switching valve for brake 61 is ON, the brake unit 5
Nine brakes are activated. A silencer 57 is provided at each of the exhaust-side T ports.

According to the configuration described above, the operation is almost the same as the operation of the above-described first embodiment. Referring to FIGS. 2A to 2D and FIG. When the air cylinder 27 with brake of the reverse plate holding device 23 is at the position shown in FIG.
SOL1 is turned ON by a signal from the control unit 31, and the P port and the A port of the ascending electromagnetic switching valve 77 are communicated with each other.
Air is supplied into the push-up chamber 45 to be in a standby state while being processed. Also, at this time, the S
OL3 is turned off, the P port and the B port of the electromagnetic switching valve for brake 61 are communicated to open the brake portion 59, and SOL2 of the electromagnetic switching valve for lowering 83 is turned off.
Then, the air set to a low pressure by the low-pressure regulator 81 is supplied to the pressing chamber 47.

Next, the state shown in FIG. 2B is a state in which the cutting process is performed and the ram 13 is at the lower end. Ram 1
During the lowering of SOL3, SOL1 is OFF, the SOL of the lowering electromagnetic switching valve 83 and the SO of the brake electromagnetic switching valve 61
L3 remains OFF. For this reason, the air in the push-up chamber 45 of the air cylinder 27 with brake is pressurized while being compressed, and the pressing force increases.

Next, the state shown in FIG.
That is, SOL of the ascending electromagnetic switching valve 77 and SLO2 of the descending electromagnetic switching valve 83 are turned off as they are, and SOL3 of the electromagnetic switching valve for brake 61 is turned on from the OFF state.
become. In this state, the movable blade 11 releases the cut plate material W by raising the ram 13, and the ram 13 returns to the top dead center.

FIG. 2D shows a step in which the reverse plate presser is being raised. When a certain period of time has elapsed since the timer 33 started after SOL3 was turned on, SOL3 of the electromagnetic switching valve 61 for brake is turned off. Accordingly, when the brake is released, the air is accumulated in the push-up chamber 45, so that the reverse plate holding member 25 is raised without supplying air.

The air consumed in the cutting process as described above is the amount of air supplied to prevent the negative pressure in the pressing chamber 47 from being pressurized in the rising process of the piston rod 69 and leaked from the low-pressure regulator 18 to the atmosphere. Only be. It should be noted that SOL1, SOL2, and SOL2 in the operation of FIG.
ON and OFF of SOL3 are as shown in FIG.

The effect is the same as the effect described in the first embodiment, and in addition to the effect, the pressing chamber 4 provided in the air cylinder 27 with brake is provided.
7 is that only a low pressure of about 1/2 to 1/5 of the predetermined pressure is applied.

The present invention is not limited to the above-described embodiment of the present invention, but can be embodied in other forms by making appropriate changes.

[0047]

As will be understood from the above description of the embodiment of the invention, according to the present invention according to the first aspect, the first switching valve is provided in the air control circuit for operating the air cylinder with brake. The first switching valve was communicated with a push-up chamber provided in the air cylinder with brake. Further, a second switching valve for operating a brake portion of the air cylinder with a brake is provided.

When the plate material is sheared, the air in the push-up chamber is accumulated without being released by the first switching valve, and the second switching valve is actuated to hold the reverse plate by the brake portion provided in the air cylinder with brake. The lifting of the member is stopped, and at this time, the upper blade of the dough returns to the top dead center, and the cut plate is opened. Thereafter, the brake unit is released and the reverse plate holding member is raised by the accumulated air pressure.

Conventionally, air for one stroke was required in the air cylinder. However, by releasing the cut plate material without releasing the supply air in a series of operations in the cutting process, The supply is kept very low, the air consumption can be greatly reduced, the capacity of the compressor can be reduced, and the maintenance costs can be reduced by using air pressure.

According to the second aspect of the present invention,
A third switching valve was provided in a pipe leading to the press chamber of the air cylinder with brake. For this reason, in addition to the effect of the above-described claim 1, it is possible to apply only a low pressure of about 1/2 to 1/5 of the predetermined pressure to the pressing chamber of the air cylinder with the brake.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a main part of the present invention and showing a shearing machine and a pneumatic circuit.

FIGS. 2A to 2D are explanatory views of the operation of the reverse plate holding device.

FIG. 3 is an explanatory diagram showing an operation of a solenoid of each electromagnetic switching valve in a cylinder process of the present invention.

FIG. 4 shows an embodiment of the present invention,
FIG. 2 is an explanatory side view illustrating a schematic configuration of the shearing machine.

FIG. 5 is an explanatory view showing an example of another embodiment of the present invention and showing an air cylinder with a brake and a pneumatic circuit.

FIG. 6 is an explanatory view showing an operation of a solenoid of each electromagnetic switching valve in a cylinder step in an example of another embodiment of the present invention.

FIG. 7 is an explanatory view showing a conventional example and showing a pneumatic circuit in a shearing machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shearing machine 7 Table 9 Fixed blade 11 Movable blade 13 Ram 19A, 19B Detector 23 Reverse plate holding device 25 Reverse plate holding member 27 Air cylinder with table 29 Pneumatic circuit 31 Control unit 35 Air source 39 High pressure regulator 41 First pipe Road 43 Second conduit 45 Push-up pneumatic chamber 47 Push-down pneumatic chamber 49 Electromagnetic switching valve for ascent 51 Pipe 53 Throttle valve with check valve 55 Pipe 59 Brake section 61 Electromagnetic switching valve for brake 71 First Sugeway 73 Second pipeline 75 Third pipeline 77 Electromagnetic switching valve for ascending 81 Low pressure regulator 83 Electromagnetic switching valve for descending W Plate

Claims (2)

[Claims] In a reverse plate holding device of a shearing machine for shearing a plate material by cooperation of a fixed blade and a movable blade provided on a ram, an air cylinder for driving a reverse plate holding member has a stroke length longer than a ram machining stroke. An air cylinder with a long brake, provided with a regulator for setting an air pressure from an air source to a predetermined pressure, and a first pipeline connecting the regulator and the air cylinder, wherein the first pipeline is branched and one is air A first switching valve is connected to the cylinder lifting chamber and the other is connected to the air cylinder pressing chamber, and a first switching valve that can switch the first conduit to one of the lifting chamber and the pressing chamber is provided to control the on / off operation of the cylinder brake. A second switching valve and a second pipe connecting the second switching valve and the regulator are provided, and ON / OFF control of the first and second switching valves is performed. At least when the ram descends, the control section seals the air in the push-up chamber, receives a detection signal that the ram has reached the descending end, turns on the air cylinder brake, and after the ram turns up, the cylinder brake A reverse plate holding device of a shearing machine, wherein each switching valve is controlled so as to turn off the switch. 2. A reverse plate holding device of a shearing machine for shearing a plate material by cooperation of a fixed blade and a movable blade provided on a ram, wherein an air cylinder for driving the reverse plate holding member has a stroke length longer than a ram machining stroke. An air cylinder with a long brake, a regulator for setting the air pressure from an air source to a predetermined pressure, a first pipe connecting the regulator to the air cylinder push-up chamber, and a second pipe connecting the regulator to the air cylinder press chamber. And a third pipe connected to the regulator and the air cylinder brake unit, a first switching valve for turning on / off air supply to the push-up chamber is provided in the first pipe, and a third pipe is provided. Is provided with a second switching valve for controlling the on / off operation of the air cylinder brake, and a second pipe set to a low pressure is provided in the second conduit.
And a third switching valve for turning on and off the air supply to the pressing chamber, and a control unit for controlling the on / off of each switching valve is provided. The control unit seals the air in the lifting chamber at least when the ram descends. The shearing machine is characterized in that the air cylinder brake is turned on in response to the detection signal that the ram has reached the lower end, and each switching valve is controlled so that the cylinder brake is turned off after the ram has started moving upward. Reverse plate holding device.