JPH0525780Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The invention relates to a workpiece clamping device using fluid pressure, and more specifically, the invention relates to a workpiece clamping device using fluid pressure, and more specifically, when the workpiece is clamped with a clamp member, the workpiece is tilted. This invention relates to a workpiece clamping device that clamps a workpiece reliably and uniformly without any problems.

(Prior Art) Conventionally, for example, a horizontal band saw used as a cutting machine uses a work clamping device for clamping and unclamping a work.

As the work clamp device, a vise device consisting of a fixed vise jaw and a movable vise jaw is used. The movement of the fixed vise jaw and the movable vise jaw is performed by a hydraulic cylinder serving as a fluid cylinder. The hydraulic cylinder is controlled by a hydraulic circuit.

The hydraulic circuit consists of a drive pump, a pressure reducing valve, an electrohydraulic switching valve, a check valve, etc. Furthermore, when clamping a workpiece with the vise device, a fixed vice jaw, which is a reference vise, is first brought into contact with the workpiece and fixed at the reference position so that the workpiece is not clamped at an angle. Next, the movable vice jaw moves to come into contact with the workpiece and clamp it.

(Problem to be Solved by the Invention) By the way, as a means for first abutting and fixing the above-mentioned fixed vise on the work, and then moving the movable vise and clamping the work, there is a sequence in the hydraulic circuit. A valve is installed and carried out.

However, since this sequence valve has a complicated structure and is expensive, there has been a problem in that the manufacturing cost of the hydraulic circuit is high.

The purpose of the present invention is to provide a workpiece clamping device using fluid pressure that can operate workpiece clamps more reliably and uniformly and can be manufactured at low cost by combining a check valve without using a sequence valve. It is in.

[Structure of the invention] (Means for solving the problem) In order to achieve the above-mentioned object, the present invention has a fixed clamping member and a movable clamping member in a clamping device that can freely clamp a workpiece, and a fluid cylinder for the fixed clamping member. , is connected to the fluid cylinder for the movable clamp member, and checks the fluid pressure circuit in the opposite direction on the side of the fluid cylinder for the movable clamp member so that the fluid cylinder for the movable clamp member is activated after the fluid cylinder for the fixed clamp member is activated. A workpiece clamping device using fluid pressure is constructed by providing valves in parallel, including a check valve that allows inflow of a fluid cylinder for a movable clamping member, and an elastic member for resisting a flow path.

(Function) By employing the workpiece clamping device of the present invention, the fixed clamp member on the reference side first contacts the workpiece and is fixed at the reference position, and then the movable clamp member moves and contacts the workpiece to remove the workpiece. clamps securely and evenly. Moreover, as a means for first moving the fixed clamp member to the reference position and then moving the movable clamp member, a check valve equipped with an elastic member for flow resistance and a check valve in the opposite direction are provided in parallel with each other, making it possible to It has a simpler structure and lower manufacturing cost than other sequence valves.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

Referring to FIG. 1, a cutting section 5 is provided on a main body frame 3 of a horizontal bandsaw machine 1 serving as a cutting machine. The workpiece W to be cut by the cutting section 5 is clamped and fixed by a main body vice device 7 provided on the main body frame 3. In order to place and support the workpiece W, a support frame 9 is integrally connected to the main body frame 3 and extends in a direction perpendicular to the cutting direction of the cutting section 5 .

In order to feed the workpiece W to the cutting section 5, a material feeding vice device 11 is provided on the support frame 9 and is movable back and forth.

A normal saw blade housing 13 constituting the cutting section 5 is mounted on the main body frame 3 so as to be rotatable in the vertical direction about a hinge pin (not shown). The saw blade housing 13 has a drive wheel (not shown) rotatably driven by an appropriate drive source and a driven wheel (not shown) paired with the drive wheel rotatably installed therein.

The driving and driven wheels include a loop-shaped band saw blade 1 having an appropriate cutting width for cutting the workpiece W.
5 is wound. Further, the main body vice device 7 is mounted on the main body frame 3. The main vice device 7 includes a fixed vise yaw 17, a movable vise yaw 19 that is movable in the same direction as the cutting direction of the cutting section 5 (left and right direction in FIG. It is composed of a hydraulic cylinder 21, a rack 23, a claw part 25, etc.

Additionally, a limit switch 27 is attached to the main body vise device 7 to detect when the material feeding vise device 11, which performs the material feeding operation as described later, is moved in the direction of the main vice device 7 and the material feeding operation is completed. .

A plurality of support rollers 29 for mounting and supporting the work W are rotatably attached to one end (the upper end in FIG. 1) of the support frame 9. Further, a plurality of guide rails 31 are mounted on the support frame 9 and extend in a direction perpendicular to the cutting direction of the cutting section 5 (vertical direction in FIG. 1), that is, in the material feeding direction.

The material feeding vise device 11 is slidably supported on the plurality of guide rails 31 . The material feeding vise device 11 is configured almost the same as the main body vise device 7 described above, and the fixed vise device 3
3. It consists of a movable vice-joy 35, a hydraulic cylinder 37 for moving the movable vice-joy 35 forward and backward relative to the fixed vice-joy 33, a rack 39, a pawl portion 41, etc.

Furthermore, the material feeding vise device 11 is appropriately connected to the tip of the piston rod 45 of the material feeding vice moving cylinder 43 which extends parallel to the plurality of guide rails 31, and the material feeding vice moving cylinder 43 is operated. It approaches and moves away from the main body vice device 7. Note that the material feeding vice moving cylinder 43 is constituted by a double-acting cylinder operated by hydraulic pressure.

With the above configuration, the workpiece W is placed on the plurality of support rollers 29 provided on the support frame 9, and the tip of the workpiece W is placed on the bandsaw blade 1 by the material feeding vice device 11 and the material feeding vice moving cylinder 43.
The material is fed to a position where it comes into contact with the side surface of the main body 5, and is clamped and fixed by the main body vise device 7. At this time, the material feeding vise device 11 is at the closest position to the main vice device 7 and is releasing the workpiece W.

Next, the saw blade housing 13 of the cutting section 5 is rotated upward, and the material feeding vice device 11 is moved to the main vice device 7 by the operation of the material feeding vice moving cylinder 43.
move in the direction away from.

The material feeding vise device 11 performs a clamping operation for the workpiece W, and at the same time, the main body vise device 7 performs a releasing operation.

Next, the workpiece W is fed by operating the material feeding vice moving cylinder 43 in the opposite direction. When the limit switch 27 attached to the main body vice device 7 detects that the material feeding vise device 11 has reached the material feeding end, the main body vice device 7 performs a clamping operation for the workpiece W, and the material feeding vice device 11
The release operation of the workpiece W is performed. below,
The same material feeding is repeated n times and the material feeding vise device 11
When the feeding of the workpiece W by a predetermined dimension is completed, the cutting process is started.

Fixed vise 3 of the material feeding vise device 11
3, a hydraulic circuit clamps the workpiece W by the lateral movement of the movable vise jaw 35, and the material feeding vise device 11 is connected to the material feeding vise moving cylinder 43.
A hydraulic circuit for moving the workpiece W in the material feeding direction is shown in FIG.

In FIG. 2, a hydraulic cylinder 47 is provided for moving the fixed vise jaw 33 of the material feeding vise device 11 in the left-right direction. A piston 49 is installed inside the hydraulic cylinder 47, and a piston rod 5 is attached to the left end of the piston 49.
1 is integrated. The piston rod 51
The distal end portion of is fixed to a part of the fixed vise jaw 33 with a pin 53. A spring 55 is interposed between the rear end of the cylinder 47 and the rear of the fixed vice jaw 33. A cylinder chamber 57 is formed between the piston 49 in the hydraulic cylinder 47 and the inner wall of the hydraulic cylinder 47.

On the other hand, a hydraulic cylinder 37 is provided for moving the movable vice jaw 35 of the feed vise device 11 in the left and right direction.
A piston 59 is housed inside the piston 7. A piston rod 61 is integrated into the right end of the piston 59, and the tip of the piston rod 61 is connected to a pin 6.
3, it is fixed to a part of the movable vice jaw 35.

A first cylinder chamber 65 and a second cylinder chamber 67 are formed in front and behind the piston 59 in the hydraulic cylinder 37.

One end of an oil pipe 69 is connected to the cylinder chamber 57, and the other end of the oil pipe 69 is connected to one end of a check valve 71. The other end of the check valve 71 is connected to an electrohydraulic switching valve 75 as a switching valve via an oil pipe 73.
It is connected to the. The electrohydraulic switching valve 75 is, for example, a 4-port 3-position switching valve, with A, B, P
and R ports, and solenoid SOL
1 and 2 are provided. The oil pipe 73 is connected to the B port.

One end of an oil pipe 77 is connected to the P port of the electromagnetic hydraulic switching valve 75, and the other end of the oil pipe 77 is connected to a pressure reducing valve 79. One end of an oil pipe 81 is connected to the pressure reducing valve 79, and the other end of the oil pipe 81 is connected to a hydraulic pump 83. One end of an oil pipe 85 is connected to the hydraulic pump 83, and the other end of the oil pipe 85 is connected to the filter 8.
It communicates with an oil tank 89 via 7. A drive motor 91 such as an electric motor is coupled to the hydraulic pump 83 .

The first cylinder chamber 6 of the hydraulic cylinder 37
One end of an oil pipe 93 is connected to the oil pipe 5 , and the other end of the oil pipe 93 is connected to the oil pipe 69 at a connecting portion 95 . A check valve 97 equipped with an elastic member for flow resistance is provided in the middle of the oil pipe 93, and a check valve 99 is connected in parallel with the check valve 97 equipped with the elastic member in the opposite direction.

One end of an oil pipe 103 is connected to a connecting portion 101 in the middle of the oil pipe 69, and the other end of the oil pipe 103 is connected to the first cylinder chamber 10 of the actuator 105.
7 is connected. That is, the actuator 105 is connected in a branch circuit parallel to the electrohydraulic switching valve 75. A piston 109 is installed inside the actuator 105, and piston rods 111, 11 are installed on both sides of the piston 109.
3 extends and protrudes in the left-right direction. Moreover, the first cylinder chamber 107 and the second cylinder chamber 115 are formed with the piston 109 in the actuator 105 sandwiched therebetween, and the piston 109 in the first cylinder chamber 107 is provided with a spring 1.
17 is interposed and is constantly biased toward the right in FIG.

Further, a switch 119 is provided near the protrusion side of the piston rod 113.
The oil pipe 77 is connected to the connecting portion 12 in the middle of the oil pipe 77.
1 is connected to the second cylinder chamber 115 via an oil pipe 123.

The second cylinder chamber 6 of the hydraulic cylinder 37
One end of the oil pipe 125 is connected to 7, and the oil pipe 125
The other end is connected to the A port of the electrohydraulic switching valve 75. Connection part 12 in the middle of oil pipe 125
7 is connected to the check valve 71 by an oil pipe 129. The R port of the electromagnetic oil switching valve 75 is communicated with the oil tank 89 via an oil pipe 131.

With the above configuration, when the drive motor 91 is driven, the pressure oil pump 83 is activated, and the oil in the oil tank 89 is sucked up through the filter 87 and the oil pipe 85, and further through the oil pipe 81 and the pressure reducing valve 79. A predetermined pressure oil is supplied to the

The oil pressure supplied to the oil pipe 77 is switched so that the P port and the B port are communicated by activating the solenoid SOL2 of the electromagnetic hydraulic switching valve 75, and the pressure oil flows through the oil pipe 73, check valve 71, and oil pipe 69. Through the cylinder chamber 5 of the pressure oil cylinder 47
7. When the piston 49 moves to the left due to the pressure oil supplied to the cylinder chamber 57, the fixed vice jaw 33 moves to the left via the piston rod 51, comes into contact with the workpiece W, and is fixed.

Moreover, the pressure oil supplied to the oil pipe 69 is
The oil flows from the oil pipe 93 to the oil pipe 93 and is supplied to the first cylinder chamber 65 of the hydraulic cylinder 37 through a check valve 97 equipped with an elastic member. The piston 59 is moved to the right by the pressure oil supplied to the first cylinder chamber 65, and the movable vice jaw 35 is moved to the right via the piston rod 61 and comes into contact with the workpiece, thereby clamping the workpiece W. .

In this case, since a check valve 97 equipped with an elastic member for flow resistance is provided in the middle of the oil pipe 93, after the fixed vice jaw 33 contacts the workpiece W first, the check valve 97 equipped with the elastic member Since the pressure oil flows against the urging force of the elastic member 97, the movable vise jaw 35 moves behind the fixed vise jaw 33 and comes into contact with the workpiece W, so that the workpiece W is clamped by the fixed vise jaw 33 and the movable vice jaw 35. The Rukoto. Therefore, the workpiece W is not clamped in a tilted manner and is clamped uniformly.

In this case, when the pressure oil supplied to the oil pipe 77 is flowing through the oil pipe 69 via the electrohydraulic switching valve 75, check valve 17, etc., the pressure P ₂ of the pressure oil in the oil pipe 69 is Pressure loss occurs due to fluid resistance caused by the electromagnetic switching valve 75, check valve 71, etc., and the pressure becomes lower than the pressure _P1 in the oil pipe 77.

In this state, in the actuator 105, the pressure oil in the oil pipe 77 is transferred to the second oil pipe 123 through the oil pipe 123.
It is supplied to the cylinder chamber 115. On the other hand, oil pipe 6
Pressure oil 9 is supplied to the first cylinder chamber 107 via an oil pipe 103. The pressure P ₂ of the pressure oil supplied to the first cylinder chamber 107 is
From the pressure _P1 of the pressure oil supplied to 5, a differential pressure is generated due to the pressure loss due to the resistance of the fluid mentioned above.
Even due to the biasing force of the spring 117 within the first cylinder chamber 107, the piston 109 is in a state where it hardly moves. Therefore, switch 11
9 does not work.

Next, when the movable vice jaw 35 stops and clamps the work W, the pressure oil in the oil pipe 69 does not flow, and the pressure P ₂ of the pressure oil in the oil pipe 69 becomes almost the same as the pressure P ₁ of the pressure oil in the oil pipe 77.

In this state, the pressure P ₂ in the first cylinder chamber 107 of the actuator 105 and the pressure P ₁ in the second cylinder chamber 115 are approximately the same.
Further, since the first cylinder chamber 107 and the second cylinder chamber 115 have approximately the same area, the biasing force of the spring 117 is activated to move the piston 109 to the right in FIG. 2. piston 10
9 moves, the piston rod 113 presses the switch 119, and the switch 119 is activated.
For example, a lamp lights up and it can be confirmed that the movable vice jaw 35 has clamped the workpiece W.

When unclamping the movable vice jaw 35 from the workpiece W, the solenoid SOL1 of the electrohydraulic switching valve 75 is activated and switched to communicate with the A port and the P port, and the pressure oil in the oil pipe 77 is supplied to the oil pipe 125. Ru. Pressure oil in the oil pipe 125 is supplied to the second cylinder chamber 67 of the hydraulic cylinder 37, the piston 59 moves to the left, the movable vice jaw 35 moves to the left, and the workpiece W is unclamped.

The pressure oil in the first cylinder chamber 65 passes through the oil pipe 93 and the check valve 99 and returns to the oil pipe 69, and then the check valve 71 (the check valve 71 is floated upward by the pressure oil from the oil pipe 129). Cylinder chamber 57 via oil pipe 73 and oil pipe 139
It will be returned to the oil tank 89 together with the pressure oil.

Therefore, the workpiece W by the movable vise 35
To confirm the clamping of the switch 119, the actuator 105 automatically operates without adjusting the force of the spring 117 of the actuator 105.
This is done with the device in the ON state. Furthermore, even if the type or material of the workpiece W changes and the set pressure of the clamp is readjusted each time, the actuator 105 can automatically operate as it is without any adjustment. Therefore, it does not require much effort on the part of the operator, and since there is no need for adjustment, work efficiency is also improved.

A check valve 97 equipped with an elastic member is provided in the circuit that supplies pressure oil to the first cylinder chamber 65 of the hydraulic cylinder 37 for moving the movable vice jaw 35, and a check valve 99 is provided with the elastic member. 35 is fixed vise 3
It operates later than 3. As a result, the workpiece W is clamped uniformly and accurately by the fixed vise jaw 33 and the movable vise jaw 35 without tilting. Furthermore, by forming a circuit in which a check valve 97 provided with an elastic member and a check valve 99 in the opposite direction are provided in parallel, the structure is simpler than that of conventional sequence valves and can be manufactured at a lower cost.

A piston 133 is installed inside the material feeding vice moving cylinder 43, and the piston 13
A piston rod 45 is integrated into one end of the piston rod 45 at the right end in FIG. Material feeding vise moving cylinder 4
3, a first cylinder chamber 135 and a second cylinder chamber 137 are formed with a piston 133 in between.

One end of an oil pipe 139 is connected to the first cylinder chamber 135, and the other end of the oil pipe 139 is connected to the check valve 14.
Connected to 1. One end of an oil pipe 143 is connected to the check valve 141, and the other end of the oil pipe 143 is connected to an A port of an electrohydraulic switching valve 145.

As the electromagnetic hydraulic switching valve 145, for example, a 4 port 3 position electromagnetic switching valve is used, and the A port,
It has a B port, a P port, and an R port, and is equipped with solenoids SOL3 and SOL4.

Solenoid in electrohydraulic switching valve 145
For example, a notch is provided in the spool at a position on the SOL3 side, so that the current of the solenoid SOL3 can be changed to high speed, medium speed, low speed, and slow start by switching the contacts.

The oil pipe 14 is connected to the P port of the electromagnetic hydraulic switching valve 145.
7 is connected to the oil pipe 147, and the other end of the oil pipe 147 is connected to the oil pipe 81 at a connecting portion 149.

One end of an oil pipe 151 is connected to the second cylinder chamber 137 of the material feeding vice moving cylinder 43, and the other end of the oil pipe 151 is connected to a check valve 153. Further, one end of an oil pipe 155 is connected to the check valve 153, and the other end of the oil pipe 155 is connected to the B port of the electromagnetic hydraulic switching valve 145. One end of an oil pipe 157 is connected to the R port of the electromagnetic hydraulic switching valve 145, and the other end of the oil pipe 157 is connected to the oil pipe 1.
31 at a connecting portion 159, and the oil tank 8
It is connected to 9.

An oil pipe 163 is connected to the connection portion 161 of the oil pipe 155.
One end of the oil pipe 163 is connected to the check valve 141, and the other end of the oil pipe 163 is connected to the check valve 141. Further, one end of an oil pipe 167 is connected to the connecting portion 165 of the oil pipe 143, and the other end of the oil pipe 167 is connected to the oil pipe 163.

With the above configuration, when the solenoid SOL3 of the electrohydraulic switching valve 145 is actuated, the pressure oil supplied from the oil pipe 81 to the oil pipe 147 via the connection part 149 is switched so that the P port and the A port communicate with each other. It is supplied to oil pipe 143. The pressure oil supplied to the oil pipe 143 is transferred to the check valve 141 and the oil pipe 139.
The material is then sent to the first cylinder chamber 135 of the material feeding vice moving cylinder 43. 1st cylinder chamber 1
The pressure oil 35 causes the piston rod 45 to move rightward in FIG. 2 via the piston 133, thereby moving the material feeding vice device 11 forward.

At this time, the solenoid of the electrohydraulic switching valve 145
When actuating SOL3 to communicate the P port and A port, if the valve opening/closing speed of solenoid SOL3 is first gradually communicated in the direction of arrow X3 by switching the contact, a slow start will be performed and the work W and vice surface will Slippage is prevented. Furthermore, arrow
3, the opening/closing speed of the valve becomes high, pressure oil passes between the P port and the A port, and the material feeding vice device 11 is moved to the main body vice device 7.

Further, when manually positioning the material feeding vise device 11 in front and behind the main vise device 7, positioning is performed by operating at a medium speed of valve opening/closing speed as shown by arrows X2 and Y2.

When the P port and B port of the electromagnetic hydraulic switching valve 145 are switched to communicate with each other, the pressure oil in the oil pipe 81 passes through the oil pipes 147 and 155, the check valve 153, and the oil pipe 151, and then reaches the material feeding vise moving cylinder 4.
3 into the second cylinder chamber 137.

Note that the pressure oil in the oil pipe 155 is sent from the connection part 161 through the oil pipe 163 into the check valve 141.
This will cause the ball to float.

Therefore, the pressure oil sent into the second cylinder chamber 137 moves the piston 133 to the left, and the pressure oil contained in the first cylinder chamber 135 moves through the oil pipe 139, the check valve 141, and the oil pipe 1.
43 and an oil pipe 157 to be returned to the oil tank 89.

When the electrohydraulic switching valve 145 is switched to communicate the P port and the A port, the opening/closing speed of the valve is controlled at high, medium, and low speeds and at a slow start, thereby shortening the idle time. I can do it. Furthermore, in the past, 2
What used to be done with multiple valves can now be done with a single valve, resulting in low cost and good operability.

Note that the present invention is not limited to the embodiments described above, but can be implemented in other forms by making appropriate changes. For example, in this embodiment, a workpiece clamping device using a vise device as a cutting machine has been described, but the present invention can also be applied to a workpiece clamping device that clamps a workpiece with a robot hand.

[Effects of the invention] As can be understood from the above description of the embodiments, according to the invention, the fluid cylinder for the fixed clamp member and the fluid cylinder for the movable clamp member in the intermediate withdrawal pressure circuit for clamping the work are actuated. Since a check valve equipped with an elastic member and a reverse check valve are installed in parallel in the fluid pressure circuit on the fluid cylinder side for the movable clamp member of the circuit that clamps the work, the fixed clamp member hits the work first. are fixed at the reference position. Next, the movable clamp member moves and comes into contact with the workpiece, so that the workpiece is reliably and uniformly clamped. Since a plurality of check valves are combined and a conventional sequence valve is not used, the structure is simple, the manufacturing cost is low, and the operability is good.

[Brief explanation of the drawing]

FIG. 1 is a front view of a horizontal band saw according to an embodiment of the present invention. FIG. 2 is a hydraulic circuit diagram of a vice device as a work clamping device which is the main part of this embodiment. Explanation of the symbols representing the main parts of the drawings, 1...
...Horizontal band saw machine, 11... Material feeding vise device, 33...
...Fixed vice jaw, 35... Movable vice jaw, 37... Hydraulic cylinder, 49, 59... Piston, 51, 61... Piston rod, 71...
...Check valve, 75...Electrohydraulic switching valve, 79...
...Pressure reducing valve, 83...Hydraulic pump, 89...Oil tank, 97...Check valve equipped with elastic member, 99
...Check valve.

Claims (1)

[Scope of utility model registration request] A fixed clamp member and a movable clamp member in a clamping device that can freely clamp a workpiece are connected to a fluid cylinder for the fixed clamp member and a fluid cylinder for the movable clamp member, respectively, and the movable clamp member is connected to the fluid cylinder for the fixed clamp member after the fluid cylinder for the fixed clamp member is operated. In order to operate the fluid cylinder for the movable clamp member, a reverse check valve is installed in parallel in the fluid pressure circuit on the side of the fluid cylinder for the movable clamp member, and a check valve for flow resistance is installed in the check valve that allows the inflow of the fluid cylinder for the movable clamp member. A workpiece clamping device using fluid pressure, characterized by comprising an elastic member.