JP2711504B2 - Switchgear for clamping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention
The present invention relates to an opening and closing device of a clamp device for causing a predetermined process such as cleaning and painting to be performed on the workpiece.

[0002]

2. Description of the Related Art Conventionally, as an opening / closing device of a clamp device for gripping a workpiece and performing predetermined processing such as cleaning and painting on the workpiece, for example, Japanese Utility Model Publication No. 57-550
There is an apparatus used in a workpiece conveying device disclosed in Japanese Patent Publication No. 32. Hereinafter, the opening and closing device of the clamp device will be briefly described.

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

An opening and closing device provided in the clamp device includes a cam groove provided in a lateral girder portion of the U-shaped frame of the clamp device main body, and the U-shaped frame is lowered by engaging with the cam groove. And a cam roller.

When the clamp device is opened and closed, the cam roller engaged with the cam groove is lowered to move the workpiece mounting member provided at the end of both feet and the work stopper provided at the ceiling. Be sure to take the time between them.

[0006] Then, the workpiece is placed on the workpiece mounting member, positioned by the positioning pin, and then the cam roller is raised to release the downward pressing force of the U-shaped frame. The workpiece is sandwiched and fixed between the work stopper and the workpiece mounting member.

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

[0008] Therefore, a clamp device having an opening / closing device improved from these is already proposed and filed by the present applicant (Japanese Patent Application No. 4-336601). The opening / closing device of the clamp device will be described. First, the structure of the clamp device body will be briefly described with reference to FIGS.

The main body 71 of the clamping device is
2 is provided with a rotating frame 73 rotatably, and the casing 7 fixed to the rotating frame 73 is attached to the rotating frame 73.
4 (see FIG. 10), a sliding shaft 75 slidably fitted to the casing 74, a clamp member 76 attached to one end of the sliding shaft 75, and a base end of the sliding shaft 75. A clamp unit 79 is provided which includes a spring 77 which is constantly biased to the side, and a workpiece receiver 78 fixed to the base end side of the casing 74.

Further, the opening and closing device 80 of the clamp device
As shown in FIGS. 8 to 10, a pressing cylinder 82 for pressing a pressing portion 81 provided at a base end of a sliding shaft 75 of a clamp unit 79 and a piston rod 83 of the pressing cylinder 82 are connected. A rear end portion is rotatably connected to the connected connecting rod 84, a front end portion has a pressing roller 85 that abuts against the pressing portion 81, and a center portion includes a pressing arm 86 rotatably supported. Things.

When the workpiece is to be clamped by the clamp device, the pressing cylinder 82 is operated to shorten the piston rod 83, and the pressing arm 86
Is rotated in the pressing direction, and the pressing roller 85 presses the pressing portion 81 provided at the base end of the sliding shaft 75 of the clamp unit 79, and the sliding shaft 75 moves inside the casing 74 against the spring 77. It slides and pushes up the clamp member 76 to be in an unclamped state.

In this state, the workpiece is placed on the workpiece receiver 78, and the pressing cylinder 82 is operated again.
When the piston rod 83 is extended and the pressing arm 86 is rotated in the anti-pressing direction to release the pressing of the pressing roller 85 against the pressing portion 81, the workpiece is held between the workpiece receiver 78 and the clamp member 76. And clamped.

When cleaning the clamped workpiece, the high-pressure cleaning tank 87 is clamped while the workpiece is clamped.
The workpiece is rotated by rotating the rotating frame 73, and the high-pressure cleaning liquid (not shown) provided inside the cleaning liquid is jetted with the high-pressure cleaning liquid to stir the cleaning liquid. Cleaning is performed.

[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 by the pressing roller. The pressing part is pressed, the sliding shaft is slid in the casing against the spring, the clamp is pushed up, unclamped, the workpiece is placed on the workpiece receiver, and the pressing cylinder is operated again. Then, the pressing arm is rotated in the anti-pressing direction, the pressing of the pressing portion of the clamp unit by the pressing roller is released, and the workpiece is clamped by being clamped by the workpiece receiver and the clamp member. However, if foreign matter adheres to the outer periphery of the sliding shaft of the clamp unit for some reason, the sliding shaft does not slide and the workpiece cannot be clamped.

When the workpiece is forcibly clamped, the sliding shaft does not return to the original position even if the pressing of the pressing portion of the clamp unit is released, and the workpiece is not sufficiently clamped. In such a state, the clamp device may be operated to rotate the rotating frame.

In such a case, there is a problem that the workpiece falls during the cleaning. In addition, there is a problem that the spring does not extend even when foreign matter adheres to the spring, and in this case, the workpiece similarly falls.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has as its object to provide an opening / closing device for a clamping device having an extremely simple structure and capable of securely clamping a workpiece. I do.

[0018]

According to the present invention, as a means for solving the above problems, a push rod is movably provided on a main body frame of an opening / closing device body for opening and closing a clamp member provided on a clamp unit of a clamp device. At the end of the push rod, a pressing surface is formed on one side, and a contact base having an inclined contact surface formed on the other side, and a width interval between the pressing surface and the inclined contact surface of the contact base. On the narrow side narrow side, the contact base and front view,
A claw fitting comprising an L-shaped claw having a handle portion so as to have a substantially U-shape is eccentrically mounted on the push rod so as to be eccentric from the axis of the push rod, and is rotatably mounted on the main body frame. A horizontal contact surface with which the contact surface comes into contact is provided, and pressing means for pressing the push rod is provided on the main body frame.

[0019]

The present invention has been configured as described above.
When the clamp member provided on the clamp unit of the clamp device for holding 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 and presses the clamp member.

When the clamp member 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 so as to be eccentric from the axis of the push rod, when a reaction force is applied, the L-shaped claw of the claw fitting rotates to the axis side of the push rod, and L
The tip of the claw engages with the clamp member.

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

When the workpiece is placed on the clamp member in this state, the pressing cylinder is operated again, and this time, the pressing rod is operated in the contracting direction. At this time, the claw fitting also moves to the contraction side, and the L-shaped claw of the claw fitting is pulled while being engaged with the clamp member of the clamp device.

When the pressing cylinder operates so as to be shortened and the push rod reaches the contracted end, the claw fitting comes into contact with the inclined contact surface of the claw fitting on the horizontal contact surface of the main body frame, and the L of the claw fitting is reduced. The claw-shaped claw pivots in a direction opposite to the axis of the push rod to be in an open state, and the engagement between the L-shaped claw of the claw fitting and the clamp member provided in the clamp unit of the clamp device is released.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. The opening / closing device 1 of the present invention presses the pressing portion 81 provided on the clamp unit 79 of the clamp device main body 71 shown in FIGS.
6 to open and close.

In FIG. 1, a main body frame 4 is provided on a pressing cylinder 3 which is a pressing means of a main body 2 of the opening and closing device of the opening and closing device 1.
The guide holder 5 is fixedly supported at the lower end of the main body frame 4. At the bottom of the guide holder 5, there is formed a horizontal contact surface 5a with which an inclined contact surface 7 (see FIG. 4) of a claw fitting 6 described later contacts.

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

Reference numeral 10 denotes an eccentric knuckle fixed to the end of the push rod 8, and the claw fitting 6 is attached to the hinge pin 1 at a position eccentric from the axis of the push rod 8 of the eccentric knuckle 10.
1 so as to be freely rotatable.

Next, the claw fitting 6 will be described in detail with reference to FIGS. Reference numeral 12 denotes a contact base of the claw fitting 6, and reference numeral 13 denotes one side of the contact base 12, that is, a pressing surface formed at a lower portion in FIG. Reference numeral 7 denotes an inclined contact surface formed on the other side of the contact base portion 12, that is, an upper portion in FIG.

The reference numeral 14 denotes an L-shaped claw. The L-shaped claw 14 has a handle portion on the pressing surface 13 of the contact base 12.
So that the width between the pressing surface 13 of the contact base 12 and the inclined contact surface 7 is narrower so that the width is vertical.

Thus, the L-shaped claw 14 and the contact base 12
Is formed so as to be substantially U-shaped when viewed from the front. Reference numeral 15 denotes a mounting hole formed in the contact base 12 and through which the hinge pin 11 is inserted.

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

In FIG. 1 and FIG.
Is 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 a bracket 17 fixed to an appropriate position of the guide holder 5.

Reference numeral 18 denotes a stopper provided at an appropriate position on the main body frame 4 so as to be adjustable so as to suppress the movement of the push rod 8. The stopper 18 has a connection fitting 9 interposed between the upper end of the push rod 8 and the piston rod 3a.
Abuts. Reference numeral 19 denotes a mount bracket fixed to the main body frame 4.

Next, the case where the opening / closing device 1 of the present invention is applied to, for example, a clamp device main body 71 shown in FIGS. 8 and 9 will be described. In this case, in the embodiment,
The high-pressure cleaning tank 87 is formed so that the pressing portion 81 of the clamp device main body 71 projects from the left edge of the high-pressure cleaning tank 87 shown in FIG. Each of the two pressing portions 81 provided in the clamp unit 79 of the clamp device main body 71 is attached one by one below. At this time, the claw fitting 6 of the opening / closing device main body 2 is located on the pressing portion 81 side of the clamp device main body 71, and the push rod 8 is disposed so as to be perpendicular to the horizontal plane of the pressing portion 81 (FIG. 1, 2 and 7 show the opening / closing device main body 2 and the clamp device main body 7 for convenience of explanation.
The position with respect to the first pressing portion 81 is shown inverted). The clamp device main body 71 is configured to be able to move forward and reverse.

Then, when the clamp device main body 71 moves forward and is positioned at a predetermined position, and the proximity switch 16 detects the pressing portion 81 of the clamp device main body 71, the pressing cylinder 3 operates and the piston rod 3a extends. The push rod 8 is pushed out.

When the push rod 8 is pushed out, the claw fitting 6 is also pushed, and its pressing surface 13 comes into contact with and presses the pressing portion 81 of the clamp device main body 71, and the spring urges the pressing portion 81. The pressing portion 81 is pressed against the urging force.

When the pressing portion 81 is pressed in this manner, a repulsive force is imposed on the pressing surface 13 of the claw fitting 6 by the elastic force of the spring 77 of the clamp device main body 71. The claw fitting 6 is rotatably mounted on the eccentric knuckle 10 fixed to the push rod 8 while being eccentric from the axis of the push rod 8, so that when a reaction force is applied to the pressing surface 13, the L-shaped claw is formed. The pivot 14 rotates toward the axis of the push rod 8, and the tip of the L-shaped claw 14 of the claw fitting 6 is engaged with the pressing portion 81.

Further, as shown in FIG. 7, when the piston rod 3a of the pressing cylinder 3 is extended and the push rod 8 is pushed until the connecting fitting 9 comes into contact with the stopper 18, the clamp member 76 of the clamp device body 71 ( 10) rises against the elastic force of the spring 77, that is, moves in the opening direction, and the clamp device main body 71 enters the unclamped state.

In this state, the workpiece is clamped by the clamp unit 7.
When the work cylinder 78 is placed on the workpiece receiver 78, the pressing cylinder 3 is operated again, and this time, the piston rod 3a of the pressing cylinder 3 is shortened, and the pressing rod 8 is operated in the contracting direction. At this time, the claw fitting 6 also moves to the contraction side, but the L-shaped claw 14 provided on the claw fitting 6 rotates toward the axis of the push rod 8 and the tip of the claw 14 is pressed by the pressing portion of the clamp device body 71. Since the push rod 8 is in a state of engagement with the push rod 81, the claw 14 pulls the push portion 81 when the push rod 8 contracts.

That is, the pressing portion 81 of the clamp device 71
It is pulled by the elastic force of the spring 77 and the tensile force of the pressing cylinder 3. Therefore, for example, the sliding shaft 7 of the clamp unit 79 of the clamp device body 71
Even if foreign matter adheres to the outer peripheral portion of the member 5 or the spring 77, the clamp member 76 is forcibly moved in the clamp direction, and the clamp device main body 71 is reliably processed by the clamp member 76 and the workpiece receiver 78. Clamp the object.

When the piston rod 3a of the pressing cylinder 3 is shortened and the pressing rod 8 reaches the contracted end, the claw metal 6
The inclined contact surface 7 of the claw fitting 6 comes into contact with the horizontal contact surface 5 a of the guide holder 5, and the L-shaped claw 14 is rotated to the opposite axis side of the push rod 6 to be in an open state. The engagement between the L-shaped claw 14 and the pressing portion 81 of the clamp device is released (see FIG. 1). In this way, the workpiece is held in the clamping device main body 7.
When the clamp device 76 is clamped by the first clamp member 76 and the workpiece receiver 78, the clamp device main body 71 reversely moves,
The workpiece is immersed in the high-pressure cleaning tank 87 to perform predetermined cleaning.

The switchgear 1 of the present invention is described above with reference to FIGS.
However, the opening and closing device 1 of the present invention is not limited to this. This type of clamp device, that is, a device that clamps a workpiece with a clamp member by the spring force of a spring and unclamps the clamp member against the spring force of the spring by pressing, can be used in many applications. it can.

[0043]

As described above, according to the present invention, when the clamp device body is unclamped for placing the workpiece, the pressing portion of the clamp device body is pressed by the pressing surface provided on the claw fitting. When pressing and clamping the workpiece by placing the workpiece on the clamp device main body, the L-shaped claw provided on the claw fitting is engaged with the pressing portion, and the pressing portion is connected to 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 portion or the spring, and the original function of the clamp portion is reduced, the clamp portion is not covered. The workpiece can be reliably clamped.

Also, a nail fitting is eccentrically mounted on the push rod so as to be eccentric from the axis of the push rod, and is rotatably mounted. The nail is turned by the movement of the push rod and the pressing surface and the inclined contact surface provided on the nail fitting. It can be opened and closed by moving it, so there is no need for special driving means for opening and closing the claw fittings, and the opening and closing device of the clamp device is extremely simple, reducing manufacturing costs and hardly causing breakdowns, Reduction can be measured.

[Brief description of the drawings]

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

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

FIG. 3 is a plan view of the one in FIG.

FIG. 4 is an enlarged front view of a claw fitting of the opening and closing device shown in FIG. 1;

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

FIG. 6 is a plan view of the one in FIG. 4;

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

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

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

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

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

Claims (1)

(57) [Claims] 1. A clamp unit provided in a clamp unit of a clamp device.
A push rod is movably provided on the body frame of the opening / closing device body for opening and closing the clamp member , and a push surface is formed at one end of the push rod at one end, and an inclined contact surface is formed at the other side. Between the base and the width of the pressing surface and the inclined contact surface of the corresponding base.
A claw fitting comprising the contact base and an L-shaped claw having a handle portion attached so as to have a substantially U-shape as viewed from the front is eccentrically rotated from the axis of the push rod on the narrow side of the narrow gap. Movably mounted,
An opening / closing device for a clamp device, comprising: a horizontal contact surface on which the inclined contact surface of the contact base comes into contact with the main body frame; and pressing means for pressing the push rod on the main body frame.