JP2000107965A - Clamp device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clamp device in which a work can be fixed solidly by securing a sufficient rigidity, and piping and a wiring are never caught to the work and other apparatuses, and are never made into a hindrance to the working. SOLUTION: This clamp device 2 is composed by connecting an upper plate 50 and a lower plate 52 by a reinforcing plate 54 in which a through hole 54a at least a work W can passes is formed, and another similar reinforcing plate, in its frame structure. Hydraulic piping 6a and 6b, and electric wiring 32a, 32b, 34, 38c, and 38d, are housed in a space which is formed by the reinforcing plate 54; spacers; installing plates 60A and 60B; and lids or the left side and the right side corner covers. As a result, the hydraulic piping 6a and 6b, and the electric wiring 32a, 32b, 34, 38c, and 38d, are shielded from the outer side. A space is formed in the same structure in the reinforcing plate at the rear side, and the hydraulic piping and the electric wiring are housed there.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp device which presses a workpiece against a reference surface by a clamper operated by an oil pressure cylinder when the workpiece is machined by a machine tool.

[0002]

2. Description of the Related Art When machining a workpiece with a machine tool,
A clamping device for clamping a workpiece in a predetermined position is required. FIG. 8 shows an example of such a clamp device.
There is a clamp device 102 provided in the workpiece holding device 100 shown in FIG. The workpiece holding device 100 performs rotation indexing of the workpiece W about a vertical axis in order to clamp the workpiece W and process a plurality of surfaces of the workpiece W. The workpiece holding device 100 includes a turntable 118 installed at a predetermined position facing a machining spindle of a machine tool (not shown), and a clamp device 102 fixed on the turntable 118 and rotated integrally with the turntable 118. Have been.

In a clamping device 102, a clamping hydraulic cylinder 106 and a reference surface jig 112 are fixed to a framework (main body) 104 thereof. A clamper 110 is fixed to an upper end of a cylinder rod 108 of the hydraulic cylinder 106 for clamping. When the workpiece W is loaded into the clamp device 102 by an automatic loading / unloading device (not shown) and positioned, the hydraulic cylinder 106 for clamping is operated, and the clamper 110 is raised. As a result, the workpiece W is pressed against the lower surface (reference surface) of the reference surface jig 112, clamped and positioned.

A knock pin cylinder 114 is mounted on the reference surface jig 112, and a knock pin 116 projects downward by hydraulic pressure and fits into a positioning hole provided in a workpiece W as shown in the figure. This confirms that the workpiece W has been correctly positioned. The hydraulic pressure for operating the clamping hydraulic cylinder 106 and the knock pin cylinder 114 is supplied from a pump unit 124 via a distributor 120 and a solenoid valve group 122. Distributor 120 is fixed to turntable 118, and rotates integrally with table base 118a fixed on base 100a of the machine tool. Then, while rotating, the hydraulic pressure from the external hydraulic pipe 122a is applied to the hydraulic pipes 106a, 106b, 114 in the clamp device 102.
a, 114b.

FIG. 9 is a perspective view showing the structure of the frame 104 of the clamp device 102. As shown in FIG. As shown in FIG. 9, the framework 104 includes an upper plate 104a and a lower plate 10a.
4b is connected by four pillars 104c.
In this framework 104, the hydraulic cylinder for clamping 10
6. The reference surface jig 112 and the like are fixed. Further, the hydraulic piping 106a, 106b, 114a, 114b and the electric wiring are fixed by fittings along the surface of the pillar 104c.

[0006]

However, in the conventional frame structure 104 of the clamping device 102, if the weight and the processing resistance of the workpiece W are large, the rigidity is insufficient, and the workpiece W cannot be firmly fixed. For this reason, processing accuracy may be adversely affected. In addition, since the hydraulic piping and the electric wiring are mounted along the surface of the pillar 104c, there is a possibility that the work W may be caught when the work W is loaded or unloaded or other equipment approaches, and furthermore, the work of the worker may be difficult. There was a problem of getting in the way.

Therefore, in the inventions according to claims 1 to 3 of the present application, a sufficient rigidity can be secured to fix a work firmly, and at the same time, pipes and wiring can be caught on a work or other equipment or work can be performed. It is an object of the present invention to provide a clamp device that does not interfere with the clamp.

Another object of the present invention is to provide a clamp device capable of increasing the space for accommodating pipes and wirings to accommodate the pipes and wirings more neatly.

Further, in the invention according to claim 3,
An object of the present invention is to provide a clamp device capable of more freely managing piping and wiring.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a first aspect of the present invention relates to a clamp apparatus for clamping a workpiece by pressing the workpiece against a reference surface by a clamper operated by an oil pressure cylinder. ,
Constituting a framework of the clamp device, a reinforcing plate provided with a through hole of a size at least capable of passing the workpiece,
A plurality of spacers fixed to the outer surface of the reinforcing plate, and a lid provided on the plurality of spacers and provided with a through hole having a size large enough to allow at least the workpiece to pass therethrough. A clamp device has been created in which a space formed by the plurality of spacers and the lid accommodates an oil pressure pipe of the oil pressure cylinder and / or an electric wiring required for controlling the oil pressure cylinder. Here, the hydraulic cylinder may be a hydraulically operated cylinder,
It may be a pneumatically operated cylinder.

In this clamping device, the reinforcing plate provided with a through-hole having a size large enough to allow a workpiece to pass through forms a framework of the clamping device, so that the clamping device has sufficient rigidity. In addition, a spacer is fixed to the outer surface of the reinforcing plate, and a lid is mounted on the spacer, so that a space is formed by the reinforcing plate, the spacer, and the lid, and an oil pressure pipe or electric wiring is housed in this space. . As a result, the pipe or wiring is shielded from the outside, so that the pipe or wiring is not caught by a workpiece or other equipment, and does not hinder the work. In this manner, a clamp device that secures sufficient rigidity to firmly fix a workpiece and prevents pipes and wires from being caught by the workpiece or other equipment or hindering work.

According to a second aspect of the present invention, there is provided the clamping device according to the first aspect, wherein one or two of the plurality of spacers are provided on a left end face and / or a right end face of the reinforcing plate. , A corner cover is attached from the left end face and / or the right end face of the reinforcing plate to the upper surface of the spacer fixed inside, and the reinforcing plate, the spacer fixed inside and the corner A clamp device has been created in which an oil pressure pipe of the oil pressure cylinder and / or electric wiring necessary for controlling the oil pressure cylinder is accommodated in a space formed by the cover.

In this clamping device, one or two spacers are fixed inside a predetermined distance from the left and right end surfaces of the reinforcing plate, and a corner cover is attached from the end surface of the reinforcing plate to the upper surface of the spacer. Thus, in addition to the space formed by the reinforcing plate, the plurality of spacers, and the lid, another space is formed by the reinforcing plate, the spacer fixed inside, and the corner cover. Therefore, it is possible to house a plurality of pipes and wirings separately in these spaces,
Piping and wiring are housed more neatly. In this way,
The clamp device can increase the space for accommodating the pipes and the wires and can accommodate the pipes and the wires more neatly.

Further, in the invention according to claim 3,
3. The clamping device according to claim 2, wherein a length of the spacer fixed to the inside is shorter than a length of the reinforcing plate, and an oil of the hydraulic cylinder is provided in a gap formed above and / or below the spacer. A clamping device has been created which passes through the pneumatic piping and / or the electrical wiring required to control the hydraulic cylinder.

In this clamping device, the length of the spacer is shorter than the length of the reinforcing plate, so that a gap is formed above and / or below the spacer. The space connects the space formed by the reinforcing plate, the plurality of spacers, and the lid, and the space formed by the reinforcing plate, the spacer fixed inside, and the corner cover. Therefore, piping and wiring housed in one space can be routed to the other space through gaps above and / or below the spacer. In this way, a clamp device that can more freely manage piping and wiring can be obtained.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS. First, an overall configuration of a workpiece holding device including the clamp device of the present embodiment will be described with reference to FIG. FIG.
FIG. 1 is a schematic diagram illustrating an entire configuration of a workpiece holding device using an embodiment of a clamp device.

As shown in FIG. 1, the work holding apparatus 1 includes a turntable 18 rotatable with respect to a table base 18a fixed on a base 1a of a machine tool, and a work table mounted on the turntable 18. Clamp device 2
It is constituted by. In the clamping device 2,
The clamping hydraulic cylinder 6 and the reference surface jig 12 are fixed to the frame (body) 4. A clamper 10 is fixed to an upper end of a cylinder rod 8 of the hydraulic cylinder 6 for clamping. When the workpiece W is loaded into the clamp device 2 and positioned by an automatic loading / unloading device (not shown),
The hydraulic cylinder for clamping 6 is operated, and the clamper 10 is raised. As a result, the workpiece W is pressed against the lower surface (reference surface) of the reference surface jig 12, and is firmly clamped and positioned.

The reference surface jig 12 has a knock pin cylinder 1
The knock pin 16 projects downward by hydraulic pressure, and fits into a positioning hole provided in the workpiece W as shown in the figure. This confirms that the workpiece W has been correctly positioned. The hydraulic pressure for operating the clamping hydraulic cylinder 6 and the knock pin cylinder 14 is supplied from an external pump unit 22 via the solenoid valve group 40 and the distributor 20.

That is, two hydraulic pipes, a pressure pipe 22a and a return pipe 22b, extend from the external pump unit 22 through the table 18a.
0 are respectively connected to the two flow paths. The distributor 20 is fixed to the turntable 18,
Table base 18a fixed on the base 1a of the machine tool
Rotate together. While rotating, the external hydraulic piping 22a, 22b and the distributor 20
The connection with the hydraulic piping 46a, 46b connected to the upper surface of the can be maintained. The hydraulic pipe 46a is a pressure pipe connected to the pressure pipe 22a, and the hydraulic pipe 46b is a return pipe connected to the return pipe 22b.

These hydraulic pipes 46a and 46b are connected to a group of solenoid valves 40 provided on the upper part of the clamp device 2. In the solenoid valve group 40, the hydraulic piping 46a, 46b
Is branched and connected to each solenoid valve. Of these, solenoid valve 4
2 is connected to the knock pin cylinder 14 by hydraulic piping 14a, 14b. Hydraulic pressure is applied to the hydraulic pipe 14a when the knock pin 16 is moved forward (downward),
Oil pressure is applied to the hydraulic pipe 14b when the knock pin 16 is retracted (raised).

The solenoid valve 44 is connected to the hydraulic piping 6a, 6b
Is connected to the hydraulic cylinder 6 for clamping.
The hydraulic pressure is applied to the hydraulic pipe 6a when the clamp W clamps the workpiece W by moving the cylinder rod 8 forward (up). The cylinder rod 8 is moved backward (downward) to the hydraulic pipe 6b so that the workpiece W
Hydraulic pressure is applied when releasing the clamp.

These two hydraulic cylinders 6 and 14 have:
A proximity switch for detecting the forward / backward movement of the cylinder rod 8 or the knock pin 16 is provided. The clamping hydraulic cylinder 6 is provided with a proximity switch 6c for detecting that the cylinder rod 8 is at the retracted position and a proximity switch 6d for detecting that the cylinder rod 8 is at the advanced position. These proximity switches 6c, 6c
signal wirings 38c and 38 for transmitting a detection signal current from
d is a slave 38 installed above the clamp device 2.
It is connected to the.

The knock pin cylinder 14 is provided with a proximity switch 14c for detecting that the knock pin 16 is at the retracted position and a proximity switch 14d for detecting that the knock pin 16 is at the forward position. Signal wirings 38a and 38b for transmitting detection signal currents from the proximity switches 14c and 14d are also connected to the slave 38 provided above the clamp device 2.

The electric wiring in the clamp device 2 of the present embodiment will be described in more detail. The external control box 24 includes a programmable controller (PC) 2
6 and a power supply 28 are provided. The signal wiring 26a from the PC 26 and the power wiring 28a from the power supply 28 are connected to one common wiring (multi-core cable) 30 by known wiring saving means.
It is summarized in.

The shared wiring 30 is provided on the bed 1a of the machine tool.
Through the inside, it passes through the center of the distributor 20 from below the turntable 18. Immediately before entering the distributor 20, a spiral portion 30a in which the shared wiring 30 is wound several times is provided. By providing the spiral portion 30a, even if the turntable 18 rotates 360 degrees clockwise or counterclockwise, no twisting force is applied to the common wiring 30, and there is no fear of disconnection or the like. This allows the turntable 1 to rotate
The power wiring and the signal wiring can be passed from the outside to the inside of the clamp device 2 also via the cable 8.

The common wiring 30 is connected to the distributor 20
From the upper part of the terminal box, it branches into two power lines 32a and 32b and one signal line 34 in a terminal box (not shown). The power wiring 32a is connected to the slave 38 described above.
, And the power wiring 32 b is connected to a slave 36 installed on the solenoid valve group 40. Also, the signal wiring 34
Are two signal wirings 34a, 34 above the clamp device 2.
The signal line 34a is connected to the slave 36, and the signal line 34b is connected to the slave 38.

These slaves 36 and 38 constitute a known wiring saving means, and realize wiring saving by converting all external connections into connectors. From these slaves 36 and 38, as many wires as necessary are provided according to the number of solenoid valves, the number of proximity switches, and the like.
The signal transmission by the shared wiring 30 is serial communication, and the signal is transmitted by sequentially sending a set of the address and the signal.

A control signal for controlling the switching of the ports of the solenoid valves 42 and 44 is transmitted to the PC 2 in the control box 24.
6, the signal wiring 26a, the common wiring 30, the signal wiring 3
4 and 34a, and is input from the slave 36 to the solenoid valve group 40. Also, ON / OF of the proximity switches 6c, 6d, 14c, 14d indicating the state of the hydraulic cylinders 6, 14
The F signal is supplied to the signal lines 38a, 38b, 38 as described above.
c, 38d, and enters the slave 38, and the signal wiring 34b,
34, the common wiring 30, and the signal wiring 26a.
Is input to

The operating power of the solenoid valves 42 and 44 is supplied from the power supply 28 in the control box 24 to the solenoid valve group 40 from the slave 36 through the power wiring 28a, the common wiring 30, and the power wiring 32b. Also, from the power wiring 32a,
The operating power of the proximity switches 6c, 6d, 14c, 14d is supplied via the slave 38 by power wiring (not shown).

FIG. 1 is a schematic diagram showing the hydraulic piping 6
a, 6b, 14a, 14b, 46a, 46b, signal wirings 34, 34a, 34b, 38a, 38b, 38c, 38
d, the power wires 32a, 32b are shown as extending out of the framework 4 of the clamping device 2. However, actually, as described below, it is housed in a space for piping and wiring provided in the frame 4.

Next, the structure of the frame 4 of the clamp device 2 will be described with reference to FIG. FIG. 2 is a perspective view showing the structure of the framework of the clamp device of the present embodiment. As shown in FIG. 2, the frame 4 of the clamp device 2 is configured by connecting an upper plate 50 and a lower plate 52 by a pair of left and right reinforcing plates 54 and 56. The reinforcing plates 54 and 56 have through holes 54a and 56a, respectively, through which the workpiece W can pass. The upper plate 50 and the lower plate 52 also have holes 50a, 5
2a are respectively formed. Hole 50a of upper plate 50
Is the hydraulic piping 14 of the knock pin cylinder 14 described above.
a, 14b and the signal wires 38a, 38b. The hole 52a of the lower plate 52 is connected to the common wiring 30 penetrating through the distributor 20 and the hydraulic piping 46a, 4a.
6b.

The reinforcing plate 54 has a pair of spacers 58A, 58B at positions separated from the left and right end surfaces of the reinforcing plate 54.
Has been fixed. These spacers 58A, 58B are shorter in length than the reinforcing plate 54, and gaps are formed above and below the spacers 58A, 58B. These spacers 58A,
Mounting plates 60A and 60B are fixed on 58B, respectively. An annular spacer 62 is fixed around the through hole 54a of the reinforcing plate 54. The thickness of the annular spacer 62 is set to match the thickness of the spacers 58A, 58B and the thickness of the mounting plates 60A, 60B.

Although not shown in the drawing, a similar pair of spacers and a mounting plate are also fixed to the reinforcing plate 56.
A similar annular spacer 64 is fixed around the through hole 56a of the reinforcing plate 56. The spacers 58A, 58B and the like and the annular spacers 62, 64 also serve to reinforce the frame 4 of the clamp device 2. Thereby, the rigidity of the frame 4 is further enhanced. A bracket 6 is provided inside the reinforcing plates 54 and 56.
6A, 66B, 68A, 68B are fixed. The lower brackets 66A and 66B are for attaching a fixing jig for mounting the hydraulic cylinder 6 for clamping. The upper brackets 68A and 68B are for attaching a fixing jig for attaching the knock pin cylinder 14.

Further, notches 50b,
50c is provided. The notch 50b is the reinforcing plate 5
This is for passing piping and wiring from above into a space formed by the cover 4 and the spacers 58A and 58B, the annular spacer 62, and a lid which will be described later and which is mounted over the mounting plates 60A and 60B. Similarly, the notch 50c is used for the reinforcing plate 56.
This is for passing piping and wiring from above in the space formed by the spacer, the annular spacer 64 and the lid.

Next, the entire configuration of the clamp device 2 in a completed state in which necessary equipment, piping, wiring, and the like are mounted on the frame 4 having such a structure will be described with reference to FIG. FIG. 3 is a perspective view showing the overall configuration of the clamp device of the present embodiment. As shown in FIG. 3, a lid 70 having a through hole of the same shape as the through hole 54a of the reinforcing plate 54 is mounted on the mounting plates 60A and 60B of FIG. A similar lid 71 is attached to the reinforcing plate 56 side.

From the mounting plate 60A to the front end face of the reinforcing plate 54, a corner cover 72A having a substantially U-shaped cross section is mounted. A similar corner cover 72B is attached from the attachment plate 60B to the other end surface of the reinforcing plate 54. A similar corner cover 72C and another corner cover (not shown) are also attached to the reinforcing plate 56.

Further, although only one clamping hydraulic cylinder 6 and one clamper 10 are shown in the schematic diagram of FIG. 1, in actuality, as shown in FIGS. And there are two clampers. Thereafter, 6
A, 10A for the clamper, 6B for the opposite cylinder not shown in FIG. 3, and 10B for the clamper. The clampers 10A and 10B are respectively pushed up by the cylinder rods 8A and 8B of the two hydraulic cylinders 6A and 6B for clamping, and the workpiece is clamped. Therefore, the hydraulic piping 6a, 6b of the clamping hydraulic cylinders 6A, 6B
And two signal lines 38c and 38d of the proximity switch are also provided.

These clamping hydraulic cylinders 6A, 6A
B is attached to each of the fixing jigs 73A and 73B, and the front surface of the fixing jig 73A is covered with a cover 75. The other side of the fixing jig 73B is also covered with a cover (not shown). Further, as shown in FIG. 3, guide rods 7A and 7B are provided on the left and right sides of the clamping hydraulic cylinder 6A. The upper ends of these guide rods 7A, 7B are fixed to the lower surface of the clamper 10A, and slide with respect to the fixing jig 73 to move up and down integrally with the cylinder rod 8A. By these guide rods 7A and 7B, the clamper 10A moves vertically without tilting.

The pair of hydraulic pipes 46a and 46b connected to the distributor 20 of FIG. 1 are formed by the reinforcing plate 56 shown in FIG. 3, a spacer not shown, a mounting plate, an annular spacer 64, and a lid 71. It passes through the space and is taken out from the notch 50c to the upper part. And
The block 7 fixed on the upper plate 50 of the clamp device 2
6, it is connected to the solenoid valve group 40. Solenoid valve group 40
The hydraulic pressure distributed in the step (1) operates the hydraulic cylinders 6A, 6B, and 14 through hydraulic pressure pipes connected to the block 76.

That is, of the hydraulic pipes 6a and 6b connected to the left side surface of the block 76, the hydraulic pipe 6b for retreating (lowering) the hydraulic cylinder 6A for clamping penetrates the upper plate 50 and is connected to the reinforcing plate 56 as shown in FIG. Is connected to the clamping hydraulic cylinder 6A through a space formed by the spacer, the mounting plate, and the corner cover 72C which do not appear in the above. A hydraulic pipe 6a for advancing (raising) the hydraulic cylinder 6B for clamping passes through the upper plate 50 and a reinforcing plate 56 and a spacer not shown in the drawing.
It is connected to the clamping hydraulic cylinder 6B through a space formed by the mounting plate and the corner cover on the other side.

On the other hand, of the hydraulic piping 6a, 6b connected to the right side of the block 76, the clamping hydraulic cylinder 6A
Is connected to the clamping hydraulic cylinder 6A through a space below the similarly formed corner cover 72A. The hydraulic pipe 6b for retreating the hydraulic cylinder 6B for clamping is provided with a corner cover 72B.
And is connected to the hydraulic cylinder for clamping 6B through the space below. Further, the forward (downward) hydraulic pipe 14a and the backward (upward) hydraulic pipe 14b connected to the right side surface of the block 76 pass through the hole 50a of the upper plate 50 and are connected to the knock pin cylinder 14.

Next, the electric wiring will be described. As described above, the common wiring 30 penetrating the distributor 20
Are two power wires 32a and 32b and one signal wire 3
Branch to 4. These three electric wires 32a, 32b,
The upper part 34 is taken out from the notch 50b of the upper plate 50 through a space formed by the reinforcing plate 54, the spacer not shown in FIG. 3, the mounting plate and the lid 70. The power wiring 32 passes through a guide 74 having a substantially U-shaped cross section.
a is connected to the slave 38, and the power wiring 32b is connected to the slave 36. The signal wiring 34 branches into signal wirings 34a and 34b before the slave 36, and the signal wiring 34a is connected to the slave 36 as it is, and the signal wiring 34b is connected to the slave 38.

The slave 36 is mounted on the solenoid valve group 40. The slave 38 is mounted on the lower surface of a mounting plate 80 fixed to a bracket 78 fixed to a block 76. Note that the four guides 74 to 74 fixed on the upper plate 50 are guide members for orderly wiring electric wiring.

As described with reference to FIG. 1, two proximity switches 6c and 6d are mounted at the forward and backward positions of the hydraulic cylinder 6A for clamping, respectively. Two signal wirings 3 from these proximity switches 6c and 6d
8c and 38d are taken out of the notch 50c through a space formed below the corner cover 72C. Then, it passes through the inside of the three guides 74 to 74 and turns to the right side of the upper plate 50, and is connected to the slave 38.

Further, two signal wirings 38 from the two proximity switches 6c and 6d of the clamping hydraulic cylinder 6B are provided.
The c and 38d pass through a space formed below the corner cover 72B, are taken out of the notch 50b, and are connected to the slave 38. On the other hand, the two signal wires 38a and 38b from the two proximity switches 14c and 14d of the knock pin cylinder 14 pass through the hole 50a of the upper plate 50,
Connected to slave 38.

Next, a state in which the cover of the clamp device 2 is removed will be described with reference to FIG. FIG. 4 shows the corner covers 72A and 72C of the clamp device 2 and the cover 75.
It is a front view which shows the state which removed. As shown in FIG. 4, a fixing jig 73A is attached to the brackets 66A and 66B, and a clamping hydraulic cylinder 6A is fixed to the fixing jig 73A, and a pair of guide rods 7A,
7B is slidably mounted. When the cylinder rod 8A rises, the clamper 10A
Is raised, and the workpiece W is pressed against the lower surface (reference surface) of the reference surface jig 12 and clamped.

Accordingly, the hydraulic pipe 6 for raising the cylinder rod 8A (and the cylinder rod 8B, which is not visible in the drawing) is used.
It can be seen that hydraulic pressure is supplied to a. The knock pin 16 of the knock pin cylinder 14 projects downward,
Since it is fitted in the positioning hole provided in the workpiece W,
The workpiece W is correctly positioned.

On the other hand, a manifold 82 is provided at the center of the lower plate 52 of the clamp device 2. Common wiring 30 and hydraulic piping 4 passing through distributor 20
6a and 46b enter this manifold 82. The hydraulic pipes 46a and 46b exit from the left side, and as described above, the reinforcing plate 56 and the spacer 58C, the spacer 58 not shown in the drawing.
D, mounting plate 60C, mounting plate 60D and lid 7 not shown
1 and above the upper plate 50 through the space formed by
Connected to block 76.

The common wiring 30 exits from the right side and enters the terminal box 84, where it is branched into two power wirings and one signal wiring. These three electric wires are connected to the reinforcing plate 5.
4, spacer 58A, spacer 58B not shown in the figure,
It passes through the space formed by the mounting plate 60A, the mounting plate 60B (not shown) and the lid 70, and exits above the upper plate 50, and is connected to the slaves 36 and 38.

Next, the structure around the manifold 82 will be described in more detail with reference to FIG. FIG.
FIG. 5 is a plan view showing a cross section taken along line VV of FIG. 4. As shown in FIG. 5, the manifold 82 is installed right above the distributor 20 not shown in the figure, and
2a protrudes into the clamp device 2. The hydraulic piping 46a, 46b connected to the distributor 20
After exiting the manifold 82 and passing through a hole provided at the lower end of the reinforcing plate 56, the reinforcing plate 56 and the spacers 58C, 58D,
It enters the space formed by the mounting plates 60C and 60D and the lid 71. And it goes out to the upper part of the clamp device 2 through this space.

On the other hand, the common wiring 30 passing through the center of the distributor 20 exits from the manifold 82 and enters the terminal box 84, where two power wirings 32a and 32b
Is branched into one signal wiring 34. These three electric wires pass through a hole provided at the lower end of the reinforcing plate 56, and the reinforcing plate 54, the spacers 58A, 58B, the mounting plates 60A, 60
It enters the space formed by B and the lid 70. And it goes out to the upper part of the clamp device 2 through this space.

Therefore, the spacer 58A and the mounting plate 60A,
The spacer 58B and the mounting plate 60B, the spacer 58C and the mounting plate 60C, and the spacer 58D and the mounting plate 60D each correspond to a spacer in the present invention.

On the other hand, as shown in FIG.
And spacer 58A, mounting plate 60A and corner cover 72.
Another space is also formed by A. Similarly, another space is formed by the reinforcing plate 54 and the spacer 58B, the mounting plate 60B, and the corner cover 72B. Further, spaces are also formed by the reinforcing plate 56 and the spacer 58C, the mounting plate 60C and the corner cover 72C, the reinforcing plate 56 and the spacer 58D, and the mounting plate 60D and the corner cover 72D. As described above, each of these hydraulic pipes or signal wiring is also accommodated in these spaces.

The manner in which hydraulic piping and electric wiring are accommodated in these spaces will be described with reference to FIGS. FIG. 6 shows the lid 70 and the corner covers 72A, 7A.
It is a right view of the clamp device 2 which shows the state which removed 2B. In FIG. 6, through holes 5 provided in the reinforcing plate 54 are provided.
4a through a pair of internal hydraulic cylinders 6 for clamping.
A, 6B and clampers 10A, 10B are shown. The workpiece W is pressed against the reference surface jig 12 and clamped by the pair of clampers 10A and 10B.

The clamping hydraulic cylinders 6A, 6A
Of B, a hydraulic pipe 6a for raising the hydraulic cylinder 6A for clamping comes out of the block 76, penetrates the upper plate 50, and enters a space between the lid 70 and the reinforcing plate 54. Then, it is bent leftward, passes through a gap between the spacer 58A (not shown) and the upper plate 50, and is housed in a space below the corner cover 72A which is removed in the figure. Then, it is bent downward in the depth direction of the paper, reaches the front side through a notch 54c provided in the reinforcing plate 54, and is connected to the clamping hydraulic cylinder 6A as shown in FIG.

On the other hand, the hydraulic pipe 6b for lowering the hydraulic cylinder 6B for clamping also comes out of the block 76, penetrates the upper plate 50, and enters the space between the lid 70 and the reinforcing plate 54. Then, it is bent rightward, passes through a gap between the spacer 58B (not shown) and the upper plate 50, and is housed in a space below the corner cover 72B which is removed in the figure. Then, it is bent downward in the depth direction of the paper, and the reinforcing plate 5
4 to the rear side through the notch 54d provided in
It is connected to the hydraulic cylinder for clamping 6B. Also,
Clamping hydraulic cylinder 6B connected to slave 38
The signal wiring 38c, 38d for the proximity switch of
After passing through the 0 notch 50b, it is connected to the clamping hydraulic cylinder 6B through a similar route.

The three electrical wirings 32a, 32b, and 34 branched by the terminal box 84 pass through holes 54b formed at the lower end of the reinforcing plate 54, and are connected to the outside of the annular spacer 62 and the spacer 58A. Between, lid 7 removed in the figure
It is housed in the space below zero. And it is connected to the slaves 36 and 38 through the notch 50a of the upper plate 50. Thus, the hydraulic pipes 6a, 6b and the electric wires 32a, 32b, 34, 38c, 38d are connected to the reinforcing plate 54.
And spacers 58A, 58B, mounting plate 6 not shown in the figure.
0A and 60B, and the lid 70 or the corner cover 72A or the corner cover 72B which is removed in the figure.
And is accommodated in the space formed by

Next, FIG. 7 will be described. FIG. 7 is a left side view of the clamp device 2 showing a state where the lid 71 and the corner covers 72C and 72D are removed. As shown in FIG. 7, the hydraulic piping 46a,
46b passes through a hole 56b formed in the lower end of the reinforcing plate 56, and is accommodated in the space between the outside of the annular spacer 64 and the spacer, below the lid 71 which is removed in the drawing.
And, it is connected to the block 76 through the notch 50b of the upper plate 50.

The hydraulic pipe 6a for raising the hydraulic cylinder 6B for clamping comes out of the block 76, penetrates the upper plate 50, and is located in the space between the lid 71 and the reinforcing plate 56 which are removed in the drawing. Is in. The corner cover 72 is bent leftward, passes through a gap between the spacer 58D (not shown) and the upper plate 50, and is removed in the figure.
D is housed in the space below. A notch 56c provided in the reinforcing plate 56 is bent downward in the depth direction of the drawing.
Through to the rear side, and is connected to the hydraulic cylinder for clamping 6B.

On the other hand, the hydraulic pipe 6b for lowering the hydraulic cylinder 6A for clamping also comes out of the block 76, penetrates the upper plate 50, and in the space between the lid 70 and the reinforcing plate 54 which are removed in the drawing. Is in. The corner cover 72 is bent rightward, passes through a gap between the spacer 58C (not shown) and the upper plate 50, and is removed in the figure.
It is housed in the space below C. The notch 56d is bent downward in the depth direction of the paper and provided in the reinforcing plate 56.
And reaches the front side, and is connected to a clamping hydraulic cylinder 6A as shown in FIG.

The signal wiring 38 for the proximity switch of the hydraulic cylinder 6A for clamping connected to the slave 38
After passing through the notch 50c of the upper plate 50, c and 38d are also connected to the clamping hydraulic cylinder 6A through a similar route. Thus, the hydraulic piping 6a, 6b, 4
6a, 46b and signal wirings 38c, 38d include a reinforcing plate 56, spacers 58C, 58D, mounting plates 60C, 60D not shown, and a lid 71 or a corner cover 72C or a corner cover 7 which are removed in the drawing.
It is housed in a space formed by 2D.

As shown in FIGS. 6 and 7, an annular spacer 62 fixed around the through hole 54a of the reinforcing plate 54 and an annular spacer 64 fixed around the through hole 56a of the reinforcing plate 56 are provided. Because of this, the electric wiring 32a, 32
b, 34 and the hydraulic piping 46a, 46b have through holes 54a, 5b.
6a is reliably prevented from protruding. As a result, the clamp device 2 of the present embodiment is capable of loading / unloading the workpiece W.
A clamp device that can more reliably prevent an accident of catching pipes and wiring when carrying out.

As described above, in the clamp device 2 of the present embodiment, the frame 4 connects the upper plate 50 and the lower plate 52 by the pair of reinforcing plates 54 and 56 having the minimum necessary through holes. It becomes. For this reason, the clamp device 2 has sufficient rigidity, the workpiece W can be firmly fixed at a predetermined height, and sufficient processing accuracy can be obtained.
Further, the frame 4 is reinforced by the spacers 58A, 58B, 58C, 58D and the annular spacers 62, 64, and the rigidity of the clamp device 2 is further enhanced.

Also, the hydraulic piping and the electric wiring are composed of the reinforcing plate 54, the spacers 58A and 58B, the mounting plates 60A and 60B.
In the space formed by the cover 70 or the corner cover 72A or the corner cover 72B, or the reinforcing plate 5
6 and spacers 58C and 58D, mounting plates 60C and 60D, and a lid 71 or a corner cover 72C or a corner cover 72D.
Accordingly, the hydraulic piping and the electric wiring are shielded from the outside, so that the work is not caught when the work W is carried in or taken out or when another device approaches, and does not hinder the work of the worker.

In this embodiment, two spacers 58A, 58A are provided on the reinforcing plates 54, 56 as a plurality of spacers.
B, the example in which the two spacers 58C and 58D are fixed is described, but the number of spacers may be three or more for each reinforcing plate. In the present embodiment, the annular spacers 62 and 64 are provided around the through holes 54a and 56a of the reinforcing plates 54 and 56, respectively. However, these annular spacers 62 and 64 are not essential to the present invention. .

Further, in this embodiment, the framework 4
Although the example in which the upper plate 50 and the lower plate 52 are connected by a pair of reinforcing plates 54 and 56 has been described, the upper plate and the lower plate are connected by four It is good also as a structure which fixes a board. Thereby, the rigidity of the clamp device can be further increased.

In the present embodiment, an example has been described in which the hydraulic cylinders 6A and 6B are used as the hydraulic cylinders, but pneumatic cylinders may be used. In this case, the hydraulic piping of the present embodiment is a pneumatic piping. The structure, shape and dimensions of other parts of the clamping device
The material, connection relationship, and the like are not limited to the present embodiment.

[0068]

According to the first to third aspects of the present invention, the work can be firmly fixed while securing sufficient rigidity, and the pipes and the wiring are caught by the work and other equipment or obstruct the work. It does not become. Further, in the invention according to claim 2, the space for accommodating the pipes and the wires can be increased to accommodate the pipes and the wires more neatly. Further, in the invention according to claim 3, the piping and wiring can be arranged more freely.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an overall configuration of a workpiece holding device in which an embodiment of a clamp device according to the present invention is used.

FIG. 2 is a perspective view showing a structure of a frame of the embodiment of the clamp device.

FIG. 3 is a perspective view showing an overall configuration of an embodiment of a clamp device.

FIG. 4 is a front view showing a state where a corner cover and a cover are removed in an embodiment of the clamp device.

5 is a view showing a cross section taken along line VV of FIG. 4, and is a plan view showing a structure near a lower plate in one embodiment of the clamp device.

FIG. 6 is a right side view showing a state where a lid and a corner cover are removed in an embodiment of the clamp device.

FIG. 7 is a left side view showing a state where a lid and a corner cover are removed in an embodiment of the clamp device.

FIG. 8 is a schematic diagram showing an overall configuration of an example of a workpiece holding device using a conventional clamping device.

FIG. 9 is a perspective view showing a structure of a frame of a conventional clamping device.

[Explanation of symbols]

2 Clamping device 4 Framework 6A, 6B Hydraulic pressure cylinder 6a, 6b, 46a, 46b Hydraulic pressure piping 10 Clamper 32a, 32b, 34, 38c, 38d Electric wiring 54a, 56a Through hole 54, 56 Reinforcement plate 58A, 58B, 58C, 58D, 60A, 60B, 6
0C, 60D Spacer 70, 71 Lid 72A, 72B, 72C, 72D Corner cover W Workpiece

Continued on the front page (72) Inventor Hiroyoshi Nakamura 1-1-1, Asahi-cho, Kariya-shi, Aichi Prefecture Inside Toyota Machine Works Co., Ltd. (72) Inventor Toru Ozeki 1-1-1, Asahi-cho, Kariya City, Aichi Prefecture Toyoda Machine Works Co., Ltd. F-term (reference) 3C016 AA01 BA03 CA03 CB03 CC01

Claims (3)

[Claims] 1. A clamping device for clamping a workpiece by pressing it against a reference surface by a clamper operated by an oil-air pressure cylinder, wherein a frame of the clamping device is formed, and at least a through hole having a size through which the workpiece can pass is provided. A reinforcing plate provided, a plurality of spacers fixed to the outer surface of the reinforcing plate, and a lid provided on the plurality of spacers and provided with a through-hole having a size through which at least the workpiece can pass. A clamp that accommodates an oil pressure pipe of the oil pressure cylinder and / or an electric wiring necessary for controlling the oil pressure cylinder in a space formed by the reinforcing plate, the plurality of spacers, and the lid. apparatus. 2. The clamp device according to claim 1, wherein one or two of the plurality of spacers are fixed inside a predetermined distance from a left end face and / or a right end face of the reinforcing plate, A corner cover is attached from a left end surface and / or a right end surface of the reinforcing plate to an upper surface of the spacer fixed to the inside, and is provided in a space formed by the reinforcing plate, the spacer fixed to the inside, and the corner cover. A clamp device containing an oil pressure pipe of the oil pressure cylinder and / or an electric wiring necessary for controlling the oil pressure cylinder. 3. The clamping device according to claim 2, wherein a length of the spacer fixed to the inside is shorter than a length of the reinforcing plate, and a gap formed above and / or below the spacer is provided. A clamp device through which an oil pressure pipe of an oil pressure cylinder and / or electric wiring necessary for controlling the oil pressure cylinder are passed.