JPS62845Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a clamp device that clamps the workpiece in a polishing device that performs surface treatment on the workpiece, such as an automobile cylinder head, cylinder block, or gear housing. It is.

A conventional clamping device in a grinding device generally has a rotary support shaft rotatably connected to the tip of the piston rod of an air cylinder, and a clamp member for clamping the workpiece is attached to the tip of the rotary support shaft. It was spot on. However, since the cylinder and the rotation support shaft are connected in series, the entire device has to be long and the installation space for the device is large.

The purpose of this invention is to make the piston rod of the cylinder cylindrical, and to make the clamping device more compact by inserting a rotary support shaft into the cylindrical rod so that it cannot move in the axial direction but can rotate. do.

Hereinafter, one embodiment of the clamping device according to this invention will be described with reference to the drawings, taking a polishing device as an example.

A square box-shaped cabin 2 is mounted on a machine frame 1, and circular holes 3 are provided on both left and right sides of the cabin 2. A support shaft 6 is rotatably supported by a pair of bearings 4 and 5 installed on the left and right sides of the machine frame 1, and this support shaft 6 is passed through the center of the hole 3 of the cabin 2. A rotary partition plate 7 and mounting disks 8 and 9, which will be described later, are fixed to this support shaft 6.
The rotary partition plate 7 divides the interior of the cabin 2 into a workpiece loading/unloading chamber Ra and a grinding chamber Rb. A pair of mounting disks 8 are provided on both left and right end surfaces of the rotary partition plate 7 so as to cover the entire hole 3 of the cabin 2, respectively.
9 are fixed, and mounting rings 10 and 9 are fixedly attached to the outer surfaces of the mounting rings 10 and 9 so as to be rotatably fitted tightly into the holes 3, respectively.
11 is fixed. A chain 12 is attached to the outer peripheral surface of one of the mounting rings 10 in a semicircular arc shape,
The forward and reverse rotations are transmitted to the chain 12, and the mounting rings 10, 11, the mounting disks 8, 9, the rotary partition plate 7, and the support shaft 6 work together to perform 180 degrees of forward and reverse rotation intermittently.

First and second clamp devices 13A, 13B are mounted on the mounting disks 8, 9 facing each other so as to be located on one side with the rotary partition plate 7 as a boundary. Also on the other side of the third and fourth clamp devices 13C, 13
D are mounted facing each other, and the first and second clamp devices 13A, 13B and the third and fourth clamp devices 13C, 13D are provided at 180 degrees symmetrical positions with respect to the support shaft 6.

Since the first to fourth clamp devices 13A to 13D, which are the essential parts of this invention, are all formed in the same structure, the structure of only the first clamp device 13A will be detailed next with reference to FIG. , 14 is an air cylinder horizontally fixed in a cantilever manner to the outer surface of the mounting disk 8, and a piston 16 is fitted into the cylinder body 15, and a cylindrical rod 17 is mounted horizontally in the piston 16. It is inserted and fixed in the.

The proximal end of the rod 18 is fixed to a supporting piece 19 that is installed above the rear end (left end in FIG. 3) of the rod 17, and the rod 17 is attached to the protruding piece 20 that is fixed to the upper rear end of the cylinder body 15. It is an anti-rotation rod inserted so as to be parallel and horizontally reciprocating, and at its front end there are two dots 21 and 22 whose positions can be adjusted to set the reciprocating stroke of the rod 17. It is fitted. When one of the docks 21 operates a limit switch (not shown), the rod 17 is stopped at the most forward position, and the other dock 21
2 operates a limit switch (not shown),
The rod 17 is stopped at the most advanced position.

Reference numeral 23 denotes a rotary support shaft which is supported rotatably and immovably in the axial direction of the rod 17, and a disk-shaped mounting plate 24 is fastened and fixed to the front end of the shaft by a nut 25. . Reference numeral 26 denotes an appropriate number of clamps (in this example, three clamps) for clamping the workpiece, which are supported so as to project forward at 120 degrees to the connecting plate 28 which is fastened to the front surface of the mounting plate 24 with nuts 27. ) is a clamp pin (clamp member), and a stopper 2 is provided inside thereof to restrict movement of the workpiece toward the rotation support shaft 23.
9 is attached. Note that the clamp pin 2
6 can be appropriately arranged in accordance with the shape of the workpiece. A protective case 30 is removably fitted to a mounting tube 31 fixed to the inner surface of the mounting disk 8 so as to surround the rotary support shaft 23, and is designed to prevent abrasive material from colliding with the rod 17. It's summery.

32 is an air cylinder attached to a bracket 33 fixed to the outer periphery of the end of the rod 17 of the cylinder 14, as shown in FIG.
An arc-shaped brake shoe 35 is fixed to the tip of the rotary support shaft 23, and is pressed against the outer periphery of the rotation support shaft 23. Reference numeral 36 denotes an actuating piece fixed to the end face of the rotary support shaft 23, and 37 denotes a proximity switch attached to a fixed position on the machine frame 1 in correspondence with the actuating piece 36, and is connected to a timer (not shown). When the timer reaches the set time, the switch 37 becomes ready for operation, and when the switch 37 is operated by the operating piece 36, the air cylinder 32 is operated, and the brake shoe 35 is pressed against the rotation support shaft 23. Then, the support shaft 23 is stopped, and the clamp pin 26 is stopped at a fixed position.

The above is the configuration of the clamp devices 13A to 13D, and the rotation transmission mechanism to the clamp devices 13A to 13D will be briefly described with reference to FIG. A driven sprocket wheel 38 is fixed only to the outer end of the rotation support shaft 23 of the first and third clamp devices 13A, 13C. A support arm 40 is supported on the left side of the cabin 2 so as to be tiltable about a support shaft 39, and a drive sprocket wheel 41 and a driven sprocket wheel 42, which are pivotally supported at both ends of the support arm 40, are connected to each other. A drive chain 43 is hung. This support arm 40 is tilted by an air cylinder 44, and this tilting causes the drive chain 43 to move between the first and third clamping devices 13A, 1.
The clamp devices 13A and 13C are alternately engaged with the driven sprocket wheel 38 of 3C in accordance with the 180 degree reversal operation.

Next, the cleaning action will be briefly described.

In the state shown in FIGS. 2 and 4, a pair of clamp devices 13C and 13
The workpiece W clamped by D is sent into the cleaning chamber Rb by reversing the mounting disks 8 and 9 by 180 degrees, and the workpiece W clamped between the pair of clamp devices 13A and 13B is sent into the cleaning chamber Rb. It shows the state in which it is sent to the attachment/detachment chamber Ra after being polished in Rb.

When the workpiece W is stopped in the grinding chamber Rb, the air cylinder 44 is activated, the support arm 40 is tilted, and the drive chain 4 is rotated as shown in FIG.
3 meshes with the driven sprocket wheel 38 of the clamp device 13C. Due to this engagement, only the rotation support shaft 23 of the clamp device 13C rotates, and the workpiece W rotates together with the rotation support shaft 23 of the clamp device 13D on the opposite side. In this state,
The abrasive material is projected from the abrasive material projection device 45 toward the workpiece W, and cleaning is started.

On the other hand, when the workpiece W is sent into the attachment/detachment chamber Ra, the pistons 16 of the clamping devices 13A and 13B
As the rod 17 and the rotation support shaft 23 move backward, the rod 17 and the rotation support shaft 23
The workpiece W, which was clamped between the opposing clamp pins 26, is released from the clamping and carried out by the fork 46 that has moved into the loading/unloading chamber Ra, and is conveyed by the roller conveyor 47. After the workpiece W is supplied into the attachment/detachment chamber Ra by the fork 46, air is supplied to the air cylinder 14, and as the piston 16 moves forward, the rod 17 and the rotation support shaft 23 are also advanced.
The next workpiece W is clamped between the opposing clamp pins 26.

Used abrasive materials flowing down from the grinding chamber Rb of the cabin 2, debris such as burrs shot off from the workpiece W, and small amounts of abrasive materials and garbage from the loading/unloading chamber Ra are collected in the collection gutter 48. The screws are collected and transported by the screw conveyor 49.

Further, when the cleaning of the workpiece W is completed, the drive chain 43 stops at the position where the operating piece 36 corresponds to the proximity switch 37, and the air cylinder 32
is activated and the brake shoe 35 rotates on the rotation support shaft 2.
3, and the clamp pin 26 is stopped at a fixed position. In synchronization with the stopping of the clamp pin 26, the air cylinder 44 is activated, and the support arm 40 is rotated counterclockwise in FIG. Unraveled.

In this way, the loading and unloading of the workpiece W in the attachment/detachment chamber Ra and the cleaning of the workpiece W in the polishing chamber Rb are performed simultaneously, and these operations are repeated.

As described in detail above, the workpiece clamping device according to this invention has a cylindrical rod 17 that can reciprocate together with the piston 16 in the cylinder body 15, and a rod 17 that cannot move in the axial direction is provided in the cylindrical rod 17. Since the rotary support shaft 23 is inserted into the rod 17 so as to be rotatable and rotatable, the rotary support shaft 23 is incorporated into the rod 17, so that the entire device can be miniaturized and its installation space can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a grinding device incorporating the clamping device according to the present invention, seen from the front side, Fig. 2 is a cross-sectional view of the same grinding device seen from the left side, and Fig. 3 is a cross-sectional view of the grinding device incorporating the clamp device according to the present invention. FIG. 4 is a partially cutaway enlarged front view showing only such a clamping device, and FIG. 4 is a left side view of the same polishing device. Clamp devices 13A, 13B, 13C, 13
D, air cylinder 14, cylinder body 15, piston 16, rod 17, rotation support shaft 23, clamp pin 26, workpiece W.

Claims (1)

[Scope of utility model registration request] In a polishing device that performs a polishing process while holding a workpiece from both sides and rotating it around a horizontal axis, a pair of cylinder bodies are arranged facing each other and aligned in the horizontal axis direction. The rods that penetrate and are fixed to the pistons that are inserted into the respective pistons are cylindrical, and the cylindrical rods are movable back and forth together with the pistons in the clamping direction and the clamping release direction of the workpiece,
A rotary support shaft is inserted into the cylindrical rod so as to be immovable in the axial direction but rotatable, and a clamp member for clamping the workpiece is attached to the tip of the rotary support shaft. A clamping device for workpieces in a grinding device.