JPH0810493Y2 - Clamp device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a clamp device for fixing a die or a work piece such as a press machine or a die-cast machine to a base, and a pressing metal fitting of the clamp device is inserted and removed from the main body. Related to the configuration.

[Conventional technology]

As a conventional clamp device of this type, the actual device is 59-19.
There is one described in the 1227 publication. The structure is such that the clamp claw is pivotally supported inside the body to swing back and forth, and this is rocked by a hydraulic cylinder, and the clamp claw advances from inside the body to outside the body when the clamp acts. When the unclamping action is performed, it operates so as to retreat into the main body.

[Problems to be solved by the device]

In the conventional clamp device, the clamp claw receives the acting force of the hydraulic pressure supplied to the hydraulic cylinder and the acting force of the spring in the hydraulic cylinder in the clamped state.
However, when the hydraulic pressure of the hydraulic cylinder is lowered, for example, when the hydraulic hose is damaged or there is valve leakage, the clamp claw is pressed in the clamp direction by the action force of the spring in the hydraulic cylinder. Therefore, when an action larger than the action force of this spring acts in the unclamping direction, the clamp claw retracts into the main body. This is
For example, when a clamp device is used to clamp a mold attached to the slide of a press machine, the weight of the mold gives a large acting force in the unclamping direction to the clamp claw, so the clamp claw retracts and There is a risk that the mold will fall.

This invention has a structure in which a pressing metal fitting for clamping is moved in and out of a main body by a fluid pressure cylinder, and it is intended to provide a clamp device which does not cause a risk of falling of a mold even when used for clamping a mold mounted on a slide. To do.

[Means for Solving the Problems]

This invention has an inner hole or groove that has a mounting portion that is fixed or engaged with a base for pressing and fixing a mold or a workpiece and that penetrates between a front surface facing the mold or the workpiece and a rear surface on the opposite side. And a fulcrum shaft that is accommodated in the inner hole or groove so as to be able to move forward and backward and that has a pressing portion facing the base at the front end that protrudes from the front surface of the main body at the forward position and that is perpendicular to the moving direction and parallel to the base Is projected on both sides, and its fulcrum shaft is supported by the inner hole or the elongated hole on the side surface of the groove so as to be allowed to advance and retreat, and the pressing portion at the forward position is rotated in a direction away from the base surface side. A pressing metal fitting regulated by the bottom of the groove,
A cylinder body is coupled to the rear surface of the main body, and a piston rod extends in the inner hole or groove and is provided so as to face the fulcrum shaft of the rear surface of the pressing fitting at a position opposite to the base surface. A dynamic fluid pressure cylinder, a spring provided to apply a turning force to the pressing fitting in a loosening direction, and a piston rod that engages with the pressing fitting when the piston rod retracts and retracts with the pressing fitting. And an engaging protrusion.

[Action]

In use, when the piston rod is advanced by the operation of the fluid pressure cylinder, the pressing fitting is in the advanced position in which it protrudes from the front surface of the main body, and is pushed by the piston rod to rotate in the clamping direction.

When the piston rod is retracted from this clamped state, first, the piston rod is slightly retracted to rotate the pressing fitting in the unclamping direction by the pressing fitting rotating spring force. The rotation of the piston rod is restricted by the pressure fitting contacting the inner surface of the inner hole or the bottom surface of the groove, and when the piston rod further retracts, the engaging projection engages the pressure fitting and retracts accordingly, and the piston rod moves backward. The pressing metal fitting is housed in the main body when the temperature reaches. In this state, the mold or the work piece is positioned at the mounting position on the base surface, or the mold located at the mounting position on the base surface is replaced.

Next, when the piston rod advances, the front end of the piston rod pushes the pressing fitting. At this time, since the pressing metal fitting receives the rotational action force in the unclamping direction by the spring, it advances forward with the unclamping rotation position and protrudes from the front surface of the main body, and the fulcrum shaft reaches the front end of the elongated hole to move the pressing metal fitting. Forward stops. Then, as the piston rod further advances, the pressing fitting rotates in the clamping direction against the unclamping rotation acting force of the spring, and enters the clamped state.

When the fluid pressure of the fluid pressure cylinder disappears in this clamped state, and the weight of the mold acts in the direction opposite to the pressing direction of the pressing portion, the pressing metal fitting rotates in the unclamping direction. However, the rotation thereof stops at the position where the pressing fitting is restricted by the inner surface of the inner hole of the main body, and does not rotate any further. Therefore, if the amount of rotation up to the regulation is properly selected, even if the clamp device is used for clamping the mold on a slide, for example, the mold is prevented from falling.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. In the figure, 1 is a main body, 2 is a pressing fitting, 3 is a fluid pressure cylinder, 4 is an engaging protrusion, and 5 is a forward spring.

The main body 1 is divided into an upper part 10 and a lower part 11 to form a connecting screw.
It is connected at 12, and has a block shape having an inner hole 13. The inner hole 13 penetrates forward and backward so as to open to the front surface 14 and the rear surface 15 of the main body 1, the front portion has a vertically long rectangular cross-sectional shape, the rear portion has a circular cross-sectional shape toward the upper side, and the middle portion has a rectangular shape. And a circular overlapping cross-sectional shape. The lower portion 11 is provided with a T-shaped groove engaging portion 17 protruding from a flat lower surface 16 to serve as a mounting portion. As a result, the position can be moved along the T-groove 20 provided in the base surface 19 for mounting the mold 18 and the like shown by phantom lines in FIG.

The press fitting 2 has a width corresponding to the width of the rectangular cross-section of the front portion of the inner hole 13, and in the shape of a block whose height dimension is slightly smaller than the height dimension of the front inner hole 13 in FIG. Formed and has a fulcrum shaft 21 coaxially protruding from both side surfaces toward the lower side, has a pressing portion 22 protruding forward to the front upper part and having a lower surface formed into a convex curved surface, and rearward at the rear upper part. It has an abutting portion 23 of the piston rod protruding and having a rear surface formed into a convex curved surface,
A convex portion 24 protruding rearward is provided on the lower rear side. The fulcrum shaft 21 is supported by a long hole 25 which is an axial hole formed through both side walls of the main body 1 and further expanded in the front-rear direction. Therefore, the pressing fitting 2 can move within a range in which the fulcrum shaft 21 can move along the long hole 25, the pressing portion 22 projects from the front surface 14 of the main body 1 at the forward end, and is set inside the main body 1 at the backward end. And press fitting 2
Is rotatable about the fulcrum shaft 21, but the amount of rotation is relatively small, and the pressing portion 22 is separated from the pressed portion of the mold 18 by several mm.

The fluid pressure cylinder 3 is a hydraulic cylinder, and includes a cylinder body 30, a piston 31, a piston rod 32, and a rod cover.
33, a double-acting type including a piston advancing spring 5, etc. The rod cover 33 side is connected to the rear surface of the main body 1 so that the piston rod 32 extends from the rear surface of the main body 1 into the inner hole 13. The center portion of the front end surface of the piston rod 32 faces the contact portion 23 of the piston rod of the pressing fitting 2. 34, 35 in the figure
Is a pressure oil supply / discharge port.

As shown in FIG. 1, the engagement protrusion 4 is a piston rod.
At the front end of 32, spring 41 is inserted in hole 40 drilled in the vertical direction in the figure.
The pin is housed so as to project downward. The protruding end of the engaging projection 4 enters a recess 42 formed on the upper surface of the projection 24 of the pressing member 2 in the figure, and a spring 41 is provided on the bottom surface thereof.
It is in contact with the action force of. The acting force of the spring 41 acts in the direction of rotating the pressing member 2 in the unclamping direction (clockwise direction in the drawing). The concave portion 42 is composed of a notched groove portion that is opened rearward and a pin that is provided so as to traverse the rear opening side, and the engaging projection 4 engages with the pin when the piston rod 32 retracts and the pressing metal fitting 2 Can be moved backwards. The engagement relationship between the pin of the recess 42 and the engagement protrusion 4 is such that there is a gap between the piston rod 32 and the piston rod 32 at the most advanced clamped position.
After 32 is retracted a little and the pressing member 2 is rotated in the unclamping direction by the acting force of the spring 41 to reach its rotating end, the gap between them is eliminated.

The forward spring 5 is a spring 5 that constantly pushes the piston 31 forward in the fluid pressure cylinder 3, and this acting force is generated via the piston rod 32 in a state where the fluid pressure supplied to the cylinder 3 disappears. It acts so as to press and hold the pressing fitting 2 in the forward position.

In the figure, 50 is a forward / backward movement detecting portion of the pressure fitting,
It is composed of a rod 51, a spring 52, limit switches 53, 54 and the like. The rod 51 is positioned with its tip swingably engaged in a recess formed in the rear end surface of the convex portion 24 of the pressing member 2, and its rear portion penetrates the rear surface wall of the main body 1 so that the fluid pressure cylinder 3 The spring 52 is fitted in a compressed state between the enlarged portion 55 formed at the tip and the rear wall of the main body 1 reaching the lower side in FIG. Limit switches 53 and 54 are provided corresponding to the enormous portion 56 provided in the. Here, the spring 52 causes the rod 51 to follow the forward / backward movement of the pressing fitting 2, but by pressing the pressing fitting 2 forward, the action of the unclamp rotation spring 41 is assisted.

Further, in the figure, reference numerals 60 and 61 denote dust seals, which are supported by springs at two positions on both sides to allow the pressing fitting to rotate. 62 and 63 are covers.

In this clamp device, by supplying / discharging pressure oil to / from the fluid pressure cylinder 3 from the ports 34, 35, the piston 31 and the piston rod 32 advance and retreat, and based on this, the pressing fitting 2 is brought into a clamped state and an unclamped state. Change. That is,
When the piston 31 is retracted, the pressing metal fitting 2 is also retracted so that the pressing portion 22 is inside the main body 1, the engaging projection 4 and the recess 42 are engaged with each other, and the engaging projection 4 unclamps the pressing metal fitting 2. It is rotated, and the tip end surface of the piston rod 32 and the contact portion 23 of the pressing fitting 2 are slightly separated. Further, the spring 52 is compressed, and the limit switch 54 detects the backward movement of the pressing fitting 2.

When the piston 31 moves forward from the retracted position, the front end face of the piston rod 32 comes into contact with the contact portion 23 of the pressing fitting 2 and pushes it in the unclamping rotation state, so that the pressing fitting 2 allows the elongated hole 25. The die reaches the forward end, stops, and is further pushed by the piston rod 32 to rotate in the clamping direction against the pressing action of the engaging projection 4 in the unclamping direction.
The pressed part of 18 is pressed by the pressing part 22 to press and fix the die 18 to the base surface 19. Mold for this clamping of the clamping device 18
The T-groove engaging portion 17 supports the reaction force from the side.

When the hydraulic pressure supplied to the fluid pressure cylinder 3 in the clamped state is lowered due to, for example, breakage of the hydraulic hose, the clamping action is lost. However, the pressure fitting 2
Is held in the forward position by the forward spring 5 and the spring 52, and even if the weight acts on the pressing portion 22 assuming that the mold 18 is mounted on the slide side of the press machine, the pressing metal fitting 2 is unclamped. Main body 1 after rotating a little in the direction
Since it is restricted by the inner surface of the inner hole 13 and does not rotate further, the die 18 is continuously supported and the die 18 does not drop.

In the above embodiment, the advance spring 5 is the fluid pressure cylinder 3
Although the one provided inside is shown, the spring 52 or the sliding resistance alone may serve to hold the forward position of the pressing fitting.

Further, although the embodiment has shown the one having the T-groove engaging portion 17 as the mounting portion of the main body 1, it may be a fixed type using a bolt.

Further, although the engaging portion 42 of the pressing fitting 2 in the embodiment is constituted by the groove portion and the pin, the engaging portion 42 may be engaged with the piston rod side as an engaging protrusion.

Further, the inner hole 13 of the main body 1 may be a groove whose bottom is on the side where it is attached to the base, in which case the rotation of the pressing fitting 2 for preventing the die from falling is performed at the groove bottom.

[Effect of device]

According to the present invention, in the clamp device in which the press fitting is moved in and out of the main body, even when the hydraulic pressure of the fluid pressure cylinder disappears when the press fitting is protruding and in the clamped state, it is pressed by the inner surface of the inner hole of the main body or the groove bottom. Since the rotation of the metal fittings in the unclamping direction is regulated so as not to rotate more than a certain amount, even if the clamp device is used on the slide side of the press machine, the clamp will come off due to the weight of the mold and the mold will be removed. This has the effect of preventing the danger of falling.

[Brief description of drawings]

1 shows a first embodiment of the present invention, FIG. 1 is a partial longitudinal side view, FIG. 2 is a plan view, FIG. 3 is a right half front view, and FIG. 4 is a left half rear view. 1 ... Main body, 2 ... Press fittings, 3 ... Fluid pressure cylinder,
4 ... Engaging protrusion, 5 ... Forward spring, 13 ... Inner hole, 14 ...
Front surface of the main body, 15 …… rear surface of the main body, 18 …… metal mold, 19 …… base surface, 21 …… fulcrum shaft, 22 …… pressing part, 25 …… long hole, 30…
… Cylinder body, 32 …… Piston rod, 41 …… (Unclamp rotation) spring, 42 …… Concave.

Claims (1)

[Scope of utility model registration request] 1. An inner hole having a mounting portion which is fixed or engaged with a base for pressing and fixing a die or a workpiece and which penetrates between a front surface facing the die or the workpiece and a rear surface opposite to the die or the workpiece. A main body having a groove, and a fulcrum that is housed in the inner hole or groove so as to be able to move forward and backward and has a pressing portion facing the base at the front end protruding from the front surface of the main body at the forward position and that is perpendicular to the moving direction and parallel to the base surface. The shaft is projected to both sides, and the fulcrum shaft is supported by the inner hole or the long hole on the side surface of the groove so that it can be moved back and forth.The pressing portion at the forward position is rotated in the direction away from the base surface side. Alternatively, a pressing metal fitting regulated by a groove bottom surface and a cylinder body coupled to a rear surface of the main body, a piston rod extending into the inner hole or groove, and the base surface with respect to the fulcrum shaft of the rear surface of the pressing metal fitting. Double action provided opposite the opposite position A fluid pressure cylinder, a spring provided to apply a turning force to the pressing fitting in a loosening direction, and an engagement member provided on the piston rod so as to engage with the pressing fitting when the piston rod retracts and retract with the pressing fitting. A clamping device comprising a mating protrusion.