JPH079383A - Opening/closing device for clamping device - Google Patents

Abstract

PURPOSE:To make the structure of the clamping device simple, which opens/ closes the clamping device, and surely clamp an article. CONSTITUTION:A push bar 8 is movably provided for the main body frame 4 of an open/close device main body 2 opening/closing the clamping section of the clamping device. And an abutting base section 12 formed with a pressing face 13 at one end side of it, and with an oblique abutting face 7 at the other end of it, and a pawl fitting 6 composed of the abutting base section 12, and of a L shaped pawl 14 where a handle section is attache to a hold section side formed by the pressing face 13 of the aforesaid abutting section 12 and the oblique abutting face 7 in such a way as to be formed roughly into an U shape as viewed from the front, are installed onto the end section of the aforesaid push bar 8 while being eccentric to the axial line of the push bar 8. Moreover, a horizontal abutting face 5a to which the oblique abutting face 7 of the abutting base section 12 abuts is provided for the main body frame 4, and a pressing cylinder 3 is also provided, which presses the push bar 8 to the main body frame 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention grasps a workpiece and
The present invention relates to an opening / closing device of a clamp device for performing a predetermined process such as cleaning and painting on the workpiece.

[0002]

2. Description of the Related Art Conventionally, as an opening / closing device of a clamp device for gripping an object to be processed and subjecting the object to predetermined processing such as cleaning and painting, for example, Japanese Utility Model Publication No. 57-55032 has been disclosed. Some are used in the disclosed workpiece transport apparatus. The opening / closing device of this clamp device will be briefly described below.

First, the structure of the clamp device body of the clamp device will be briefly described. The clamp device main body is provided with an annular plate member for rotating in the vertical plane between the processing stations that perform processing such as cleaning and painting, and at four locations on the outer peripheral surface of the annular plate member, etc. A notch is provided at an angular position, a work stopper is provided on the ceiling portion (rotation center side) of the notch, and a U-shaped frame body surrounding the notch is slidably mounted in the rotation center direction. The U-shaped frame body is constantly urged in the direction of the center of rotation, and a workpiece mounting member having positioning pins is provided at the ends of both foot rods of the U-shaped frame body.

Further, the opening / closing device provided in the clamp device lowers the cam groove provided in the cross beam portion of the U-shaped frame body of the clamp device body and the U-shaped frame body by engaging with the cam groove. It is composed of a cam roller and a cam roller.

When the clamp device is opened / closed, the cam roller engaging with the cam groove is lowered so that the workpiece placing member provided at the end portions of the two rods and the work stopper provided at the ceiling portion. Try to keep the space wide.

Then, the work piece is placed on the work piece mounting member and positioned by the positioning pin, and then the cam roller is raised to release the downward pressing force of the U-shaped frame body. The work piece is clamped and fixed between the work stopper and the work piece mounting member.

However, conventionally, a cam groove for providing the opening / closing device of the clamp device in the transverse girder portion of the U-shaped frame of the clamp device main body, and a cam roller for engaging the cam groove to lower the U-shaped frame body Therefore, there is a problem that the structure of the opening / closing device of the clamp device is complicated, the manufacturing cost is high, and the maintenance work is difficult.

Therefore, a clamping device having an opening / closing device improved from these has already been proposed and filed by the present applicant (Japanese Patent Application No. 4-336601). The opening / closing device of this clamp device will be described. First, the structure of the clamp device body will be briefly described with reference to FIGS. 8 and 9.

The clamp device main body 71 is provided with a rotary frame 73 rotatably on a main body frame 72.
A casing 74 fixed to the rotating frame 73 (see FIG. 10) and a sliding shaft slidably fitted in the casing 74.
75 and a clamp member 76 attached to one end of the sliding shaft 75
And a spring that constantly biases the sliding shaft 75 toward the base end side.
77 and the work piece receiver fixed to the base end side of the casing 74
A clamp unit 79 consisting of 78 is provided.

Further, the opening / closing device 80 of this clamp device is
As shown in FIGS. 9 and 10, a pressing cylinder 82 for pressing a pressing portion 81 provided at the base end of the sliding shaft 75 of the clamp unit 79, and a piston rod 83 of the pressing cylinder 82.
The rear end is rotatably connected to the connecting rod 84 connected to
A pressing roller 85 that abuts the pressing portion 81 is provided at the tip end,
In addition, the pressing arm 86 has a central portion rotatably supported.

When the workpiece is clamped by the clamp device, the pressing cylinder 82 is operated to shorten the piston rod 83, rotate the pressing arm 86 in the pressing direction, and press the pressing roller 85. Clamp unit 79
When the pressing portion 81 provided at the base end portion of the sliding shaft 75 is pressed, the sliding shaft 75 slides in the casing 74 against the spring 77 and pushes up the clamp member 76, so that the unclamped state is established. Become.

In this state, the workpiece is placed on the workpiece receiver 78, the pressing cylinder 82 is operated again, the piston rod 83 is extended, and the pressing arm 86 is rotated in the counter-pressing direction. When the pressing roller 85 is released from pressing the pressing portion 81, the workpiece is clamped by being clamped by the workpiece receiver 78 and the clamp member 76.

When the clamped workpiece is to be cleaned, the clamped workpiece is immersed in the cleaning liquid in the high-pressure cleaning tank 87, and the rotating frame 73 is rotated to rotate the workpiece. A high-pressure cleaning liquid (not shown) is provided inside the nozzle to eject a high-pressure cleaning liquid to stir the cleaning liquid and clean the workpiece.

[0014]

In the prior art described above, the pressing cylinder is operated to rotate the pressing arm in the pressing direction, and the pressing roller is provided at the base end of the sliding shaft of the clamp unit. Press the pressing part, slide the sliding shaft in the casing against the spring, push up the clamp member, unclamp it, place the workpiece on the workpiece receiver, and operate the pressing cylinder again. Then, the pressing arm is rotated in the counter-pressing direction to release the pressing of the pressing portion of the clamp unit by the pressing roller, and the workpiece is clamped by being clamped by the workpiece receiver and the clamp member. However, if foreign matter adheres to the outer circumference of the slide shaft of the clamp unit for some reason, the slide shaft may not slide and the workpiece may not be clamped.

Further, when the workpiece is forcibly clamped, the sliding shaft does not return to its original position even if the pressing of the pressing portion of the clamp unit is released, and the workpiece is not clamped sufficiently. In some cases, the clamp device was activated to rotate the rotary frame.

In such a case, there is a problem that the work piece falls during cleaning. Further, even if foreign matter adheres to the spring, the spring does not expand, and this also causes a problem that the workpiece is dropped.

The present invention has been made in order to solve the above problems, and an object thereof is to provide an opening / closing device for a clamp device which has an extremely simple structure and is capable of reliably clamping a workpiece. To do.

[0018]

As a means for solving the above problems, the present invention provides a push rod movably on a main body frame of an opening / closing device body for opening and closing a clamp portion of a clamp device, and At the end, form a pressing surface on one side,
The abutting base portion having a slanted contact surface on the other side, and the narrow portion side formed by the pressing surface and the slanted abutment surface of the corresponding contact base portion, and the abutment base portion in a front view, substantially U-shaped So as to be rotatably attached to the main body frame with an inclined contact surface of the main body frame eccentrically from the axis of the push rod. It is characterized in that a horizontal abutting surface for abutting is provided and a pressing means for pressing the push bar is provided on the main body frame.

[0019]

Since the present invention is constructed as described above,
When the clamp part of the clamp device that holds the workpiece is opened, the pressing cylinder is operated to push out the push rod. When the push rod is pushed out, the claw fitting is also pushed, and its pressing surface comes into contact with the clamp portion and presses it.

When the clamp portion is pressed, a reaction force is applied to the pressing surface of the claw fitting. Since the claw fitting is rotatably mounted on the push rod with an eccentricity from the axis of the push rod, when the reaction force is applied, the L-shaped claw of the claw fitting is rotated toward the axis of the push rod, and the L-shaped claw is rotated. The tip portion of the claw engages with the clamp portion.

Further, when the pressing cylinder operates and the push rod presses the clamp portion, the clamp portion is in an unclamped state.

When the work piece is placed on the clamp portion in this state, the pressing cylinder operates again, and this time the push rod is operated in the contracting direction. At this time, since the claw fitting also moves to the contracted side, the L-shaped claw of the claw fitting pulls it while the clamp portion of the clamp device is engaged.

Then, when the pressing cylinder operates so as to shorten and the push rod reaches the contracted end, the slanted contact surface of the claw fitting abuts the horizontal contact surface of the main body frame and the claw fitting L The claws rotate to the side opposite to the axis of the push rod to be in the open state, and the engagement between the L claw of the claw fitting and the clamp portion of the clamp device is released.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The opening / closing device 1 shown in the figure is for opening and closing the clamp part by pressing a pressing part 81 'of the clamp part provided in the clamp device, for example (see FIG. 10).

In FIG. 1, a main body frame 4 is fixed to a pressing cylinder 3 of the main body 2 of the opening / closing device 1, and a guide holder 5 is fixedly supported at the lower end of the main body frame 4. A horizontal contact surface 5a is formed on the bottom of the guide holder 5 to which an inclined contact surface 7 (see FIG. 4) of a pawl metal fitting 6 described later abuts.

Reference numeral 8 denotes a push rod slidably fitted in the guide holder 5, and the upper end of the push rod 8 is fixedly supported by a connecting fitting 9 fixed to the piston rod 3a of the pressing cylinder 3. . Therefore, the pressing cylinder 3 operates and the piston rod 3a expands and contracts, whereby the push rod 8 moves up and down.

Reference numeral 10 indicates an eccentric knuckle fixed to the lower end portion of the push rod 8, and the push rod 8 of the eccentric knuckle 10 is shown.
A claw fitting 6 is rotatably attached by a hinge pin 11 at a position eccentric from the axis of the.

Next, the claw fitting 6 will be described in detail with reference to FIGS. Reference numeral 12 indicates a contact base of the claw metal fitting 6,
Reference numeral 13 indicates one side of the contact base 12, that is, a pressing surface formed on the lower side in FIG. Further, reference numeral 7 is
The other side of the contact base 12, that is, the inclined contact surface formed on the upper side in FIG. 4 is shown.

The reference numeral 14 is an L-shaped claw. The L-shaped claw 14 is fixed to the narrow side formed by the pressing surface 13 of the contact base 12 and the inclined contact surface 7 so that the handle portion is vertical to the pressing surface 13 of the contact base 12. ing.

As a result, the L-shaped claw 14 and the contact base portion 12 are formed to have a substantially U-shape when viewed from the front. Also,
Reference numeral 15 is a mounting hole formed in the contact base portion 12 and through which the hinge pin 11 is inserted.

Therefore, the claw fitting 6 is rotatable by the hinge pin 11 inserted into the mounting hole 15 of the abutment base 12 to the push rod 8 via the eccentric knuckle 10 to a position offset from the axis of the push rod 8. Installed on.

In FIGS. 1 and 2, the reference numeral 16 indicates a proximity switch for detecting the presence or absence of the pressing portion 81 'of the clamp device. The proximity switch 16 is attached to the bracket 17 fixed to the guide holder 5 at a proper position. Has been.

The reference numeral 18 indicates the main body frame 4.
Is a stopper for restricting the movement of the push rod 8 that is adjustable in place, and a reference numeral 19 is a mount bracket fixed to the main body frame 4.

Next, the operation of this embodiment will be described. The opening / closing device body 2 of the opening / closing device 1 shown in FIGS. 1 and 2 is in the original position. That is, the push rod 8 movably provided on the switchgear body 2
Is at the rising end with the piston rod 3a of the pressing cylinder 3 shortened. Further, in the claw metal fitting 6, the slanted contact surface 7 of the claw metal fitting 6 contacts the horizontal contact surface 5a formed on the guide holder 5, and the L-shaped claw 14 is opened.

Then, when the proximity switch 16 detects the pressing portion 81 'of the clamp device, the pressing cylinder 3 is actuated, the piston rod 3a extends and the push rod 8 is pushed out.

When the push rod 8 is pushed out, the claw metal 6 is also pushed, and its pressing surface 13 abuts and presses the pressing portion 81 'of the clamp device to urge the pressing portion 81', which is not shown. The pressing portion 81 'is pressed against the elastic force of the spring of the clamp device.

When the pressing portion 81 'is pressed in this way, a reaction force is applied to the pressing surface 13 of the claw fitting 6 by the elastic force of the spring of the clamp device, and the claw fitting 6 is fixed to the push rod 8. Since the eccentric knuckle 10 is rotatably mounted so as to be eccentric from the axis of the push rod 8, the L-shaped claw 14 of the claw fitting 6 rotates toward the axis of the push rod 8 and the claw fitting 6 L-shaped nail
The tip portion of 14 is brought into a state of engaging with the pressing portion 81 '.

Further, the piston rod of the pressing cylinder 3
When the push rod 8 is pushed until the connecting metal 6 comes into contact with the stopper 18, the clamp device main body (not shown) is in an unclamped state. In FIG. 7, the connecting fitting 6 is the stopper 18
It is shown that it abuts against.

When the work piece is placed on the main body of the clamping device in this state, the pressing cylinder 3 operates again, and this time the piston rod 3a of the pressing cylinder 3 shortens and the push rod 8 operates in the contracting direction. . At this time, the claw fitting 6 also moves to the contracted side, so that the L-shaped claw 14 provided on the claw fitting 6 engages with the pressing portion 81 'of the clamp device and pulls the pressing portion 81'.

That is, the pressing portion 81 'of the clamp device is pulled by the elastic force of the spring of the clamp device and the pulling force of the pressing cylinder 3, not shown. Therefore, even if foreign matter adheres to the outer periphery of the sliding shaft of the clamp unit of the clamp device (not shown) or the spring, the clamp device can reliably clamp the workpiece.

The piston rod of the pressing cylinder 3
When 3a is shortened and the push rod 8 reaches the contracted end, the claw fitting 6 has a slanted contact surface 7 of the claw fitting 6 and a horizontal contact surface of the guide holder 5.
5a, the L-shaped claw 14 is rotated to the side opposite to the axial line of the push rod 6 to be in the open state, and the engagement between the L-shaped claw 14 of the claw fitting 6 and the pressing portion 81 'of the clamp device is released. (See FIG. 1).

It goes without saying that the opening / closing device 1 can also be applied to the clamp device body 71 shown in FIG. In this case, the opening / closing device 1 pushes up the central portion of the pressing portion 81.

[0043]

As described above, according to the present invention, when the clamp device main body is unclamped for placing a workpiece, the pressing surface of the clamp device main body is used to press the pressing portion of the clamp device main body. When pressing and mounting the workpiece on the clamp device body to clamp the workpiece, the L-shaped claw provided on the claw metal fitting is engaged with the pressing portion, and the pressing portion is pressed against the pressing cylinder. Since the clamp is pulled by a pulling force or the like, even if foreign matter adheres to the outer peripheral portion of the sliding shaft of the clamp part or the spring and the original function of the clamp part is deteriorated, the clamp part is not covered. Workpieces can be reliably clamped.

Further, the claw fitting is rotatably attached to the push rod so as to be eccentric from the axis of the push rod, and the claw fitting is rotated by the movement of the push rod and the pressing surface and the inclined contact surface provided on the claw fitting. Since it can be opened and closed by moving it, no special driving means is required for opening and closing the claw fitting, the opening and closing device of the clamp device is extremely simple, the manufacturing cost is reduced and there is almost no failure, and the maintenance work of the maintenance work is reduced. Reduction can be measured.

[Brief description of drawings]

FIG. 1 is a front view of an opening / closing device of a clamp device according to the present invention.

2 is a side view of that of FIG. 1. FIG.

3 is a plan view of that of FIG. 1. FIG.

FIG. 4 is an enlarged front view of a claw fitting of the opening / closing device shown in FIG.

5 is a right side view of the one in FIG. 4. FIG.

FIG. 6 is a plan view of that of FIG.

FIG. 7 is a front view showing a position where the claw fitting of FIG. 1 is rotated.

FIG. 8 is a side view of a conventional clamp device.

9 is a top view of that of FIG. 8. FIG.

FIG. 10 is an enlarged cross-sectional view of a portion of the clamp unit shown in FIG.

[Explanation of symbols]

 1 Opening / closing device 2 Opening / closing device main body 3 Pressing cylinder 4 Main body frame 5a Horizontal contact surface 6 Claw metal fitting 7 Inclined contact surface 8 Push rod 12 Contact base 13 Pressing surface 14 L-shaped claw

Claims (1)

[Claims] 1. A push rod is movably provided on a main body frame of an opening / closing device main body for opening / closing a clamp portion of the clamp device,
At the end of the push rod, there is formed a contact base having a pressing surface on one side and an inclined contact surface on the other side, and the pressing surface and the inclined contact surface of the corresponding contact base. On the narrow part side, a claw fitting made up of the abutment base and an L-shaped claw with a handle attached so as to be substantially U-shaped when viewed from the front can be eccentrically rotated from the axis of the push rod. The opening / closing of the clamp device is characterized in that the main body frame is provided with a horizontal abutting surface on which the inclined abutting surface of the abutting base abuts, and the main body frame is provided with a pressing means for pressing the push rod. apparatus.