JP2545861Y2 - Clamping device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp device for clamping an object to be clamped by vertically swinging a clamp arm around a fulcrum bolt erected on a board.

[0002]

2. Description of the Related Art Generally, a plurality of bolt holes are formed in a predetermined arrangement in advance on the surface of a mold fixing plate such as an injection molding machine or a press machine, and a positioning device for positioning the mold and a mold are fixed. In many cases, a plurality of clamping devices for fixing are fixed on the board surface by utilizing the plurality of bolt holes. There are various configurations of the clamp device. One of the clamp devices practically used by the applicant of the present invention has a fulcrum bolt detachably erected on the surface of a mold fixing plate and a base of a clamp arm. A force point is formed at the end, an action point is formed at the tip, and a fulcrum is formed at the middle part in the length direction, so that the fulcrum bolt can be relatively moved in the length direction at the tip side part and the middle part in the length direction. An open-end slit to be inserted is formed, a clamp cylinder is fixedly mounted vertically in the cylinder mounting hole at the point of force of the clamp arm, and the fulcrum of the clamp arm is supported on the top of the fulcrum bolt from above. There is a configuration in which a fulcrum is formed, a rod of a clamping cylinder is advanced toward the board surface, a clamp arm is swung about the fulcrum, and a mold is clamped at an application point.

In the above-mentioned clamping apparatus, when a mold having a different size is clamped after the mold is replaced, the position of the clamp arm in the length direction is adjusted through a slit, or the mounting position of the fulcrum bolt is changed. Or, it corresponds. When the thickness of the clamped portion of the mold is different, the fulcrum bolt is replaced with one having a different length, and a spacer member is interposed between the tip of the rod and the board surface.

[0004]

However, in the above-mentioned clamping device, the arrangement of the bolt holes formed on the panel surface is set in advance, so that the existing bolt holes cannot be used depending on the mold depending on the mold. There is. In this case,
It is necessary to use clamp arms having different lengths. However, in the clamp device, since the clamp arm and the cylinder are integrally fixed so as not to be detachable, the clamp arm alone cannot be replaced. Different clamping devices need to be used. Therefore, it is necessary to prepare a plurality of sets of clamp devices having different lengths of the clamp arm, which is disadvantageous in terms of equipment economy, and it is necessary to reconnect the piping of the clamp cylinder, and it is necessary to exchange molds. There are problems such as a reduction in efficiency. Furthermore,
When the thickness of the clamped portion of the mold is different, since the spacer member is interposed between the board surface and the clamp device or between the mold and the clamp device, the displacement of the spacer member is likely to occur. There is also a disadvantage. An object of the present invention is to provide a clamping device that can flexibly respond to a change in the size of a mold and a change in the thickness of a portion to be clamped.

[0005]

According to a first aspect of the present invention, there is provided a clamp device, wherein a fulcrum bolt is detachably erected on a board surface for fixing an object to be clamped, a power point portion is provided at a base end portion of a clamp arm, and a force point portion is provided at a distal end portion. The working point portion is formed with a fulcrum portion in the middle portion in the length direction, and a slit is formed in the distal end portion of the clamp arm and in the middle portion in the length direction so that the fulcrum bolt is inserted so as to be relatively movable in the length direction. The clamp cylinder is mounted upright in the cylinder mounting hole at the power point of the arm, the rod of the clamp cylinder is advanced to the board side, and the fulcrum of the clamp arm is supported from above by the fixed fulcrum at the top of the fulcrum bolt. In the clamp device configured as described above, a locking flange is formed at the lower end of the cylinder body of the cylinder, and the cylinder mounting hole is formed to have a slightly larger diameter than the outer diameter of the cylinder body, The clamping cylinder capable mounted detachably from below Linda mounting hole, it is obtained by mounting the friction material to prevent falling off of the cylinder body to the cylinder mounting hole.

According to a second aspect of the present invention, there is provided a clamping device.
Wherein a spacer member for height adjustment is detachably mounted between a force point portion of the clamp arm and a locking flange of a clamping cylinder.

[0007]

In the clamping device according to the first aspect, when clamping an object such as a mold, when a hydraulic pressure is supplied to the clamping cylinder to extend the rod, the clamp arm fixes the top of the fulcrum bolt. It swings while being supported from above by the fulcrum, and the object to be clamped is clamped at the application point at the tip of the clamp arm. When the size of the clamp object is changed after the exchange of the clamp object, the position of the clamp arm is changed through the slit of the clamp arm, and the clamp can be similarly performed.

Here, even if the position of the clamp arm in the length direction is adjusted through the slit or the mounting position of the fulcrum bolt is changed, even if the object to be clamped cannot be clamped, the clamp arm is removed from the cylinder. Therefore, only the clamp arm can be exchanged and clamped, and only an inexpensive clamp arm needs to be separately prepared, which is economically advantageous in equipment. Also, since there is no need to replace the clamping cylinder, there is no need to reconnect the piping to the cylinder. In addition, since a friction material to prevent the cylinder body from dropping was installed in the cylinder mounting hole,
The clamp arm does not fall off the cylinder when the clamp device is carried when not in use.

In the clamp device according to the second aspect,
A spacer member for height adjustment is detachably mounted between the point of force of the clamp arm and the locking flange of the clamping cylinder, so by replacing the spacer member with one with a different thickness, Different clamping objects can be clamped.

[0010]

Advantages of the Invention As described above, the following effects can be obtained. According to the clamp device according to claim 1, a locking flange is formed at the lower end of the cylinder body of the cylinder,
The cylinder mounting hole is formed slightly larger than the outer diameter of the cylinder body, the clamp cylinder is detachably mounted in the cylinder mounting hole from below, and a friction material is installed in the cylinder mounting hole to prevent the cylinder body from falling off As a result, the clamp target can be clamped by simply replacing the clamp arm as needed with a simple configuration, so that only a clamp arm that can be manufactured at a low cost can be prepared separately and equipment is economically advantageous. And there is no need to reconnect the piping to the cylinder, and the effect of simplifying the work of replacing the object to be clamped can be obtained.

According to the second aspect of the present invention, since the spacer member for height adjustment is detachably mounted between the point of force of the clamp arm and the locking flange of the clamping cylinder, By replacing the clamped object with one having a different thickness, it is possible to clamp objects to be clamped having different heights of the clamped portion.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. In the present embodiment, the invention is applied to a clamp device for clamping a mold (which corresponds to a clamp target) mounted on a board of a press machine.
As shown in FIG. 1, the board surface 3 of the bolster 2 of the press machine 1
Are formed with eight bolt holes 4, and four clamping devices 5 are fixed on the board surface 3 via four outer bolt holes 4, respectively, and the mold 6 is mounted on the board surface 3 via the four clamping devices 5.
Is fixed to the approximate center of the. In addition, the said mold 6 is the board surface 3
It is assumed that the sheet is carried into the board surface 3 via a roller unit (not shown) provided in the apparatus.

The clamp device 5 includes a clamp arm 7
And a fulcrum bolt 8 and a hydraulic cylinder 9, and are configured as follows. Since the four clamp devices 5 have the same configuration, the clamp device 5 on the right front will be described. The fulcrum bolt 8 is a bolt hole 4 formed in the board surface 3.
A fixed fulcrum 8a is formed at the upper end of the fulcrum bolt 8 to restrict upward movement of the clamp arm 7, and a spherical seat 8b is formed at the lower end of the fixed fulcrum 8a in an annular shape. . The clamp arm 7 is formed of a flat plate member that is elongated in the left-right direction, and a pair of front and rear arm portions 10 that are bifurcated are formed in the right half of the clamp arm 7, and between the front and rear arm portions 10. An elongated slit 11 is formed in the left-right direction through which the vicinity of the upper end of the fulcrum bolt 8 is inserted, and a tapered surface 12 with which the lower end surface of the spherical seat 8b contacts the upper end of the clamp arm 7 facing the slit 11 is substantially U-shaped. Is formed at the left end of the clamp arm 7.
a, a fulcrum portion 7b is formed at a portion corresponding to the fixed fulcrum portion 8a of the clamp arm 7, a power point portion 7c is formed near the right end of the clamp arm 7, and a power point portion 7c
Is formed with a cylinder mounting hole 14 having a diameter slightly larger than the cylinder body 13 of the hydraulic cylinder 9.
An O-ring 15 as a friction material for preventing the cylinder body 13 from dropping is mounted in the annular groove at the middle stage.

The hydraulic cylinder 9 will be described.
A piston member 16 is slidably mounted in the cylinder body 13 in an oil-tight manner.
A piston rod 17 that penetrates a lower wall portion of the piston rod 17 in an oil-tight manner and extends downward is provided, a lower end portion of the piston rod 17 abuts on the board surface 3, and a hydraulic oil chamber 1 is provided above the piston member 16.
A return spring member 19 for urging the piston member 16 upward is provided below the piston member 16, and a lower end portion of the cylinder body 13 is provided at a lower end of the cylinder body 13 with respect to the clamp arm 7. An annular locking flange 20 for regulating the relative movement is formed, and an annular spacer member 21 for adjusting the height position of the clamp arm 7 is mounted between the locking flange 20 and the power point portion 7c. When hydraulic pressure is supplied into the hydraulic oil chamber 18 from an external hydraulic pressure supply device, the piston rod 17 is driven downward, and the clamp arm 7 swings about the fulcrum 7b in the direction indicated by the arrow in FIG. A flange 6 formed on the outer edge of the mold 6 at the action point 7a
a is clamped.

Next, the operation of the clamp device 5 will be described. When replacing the mold 6 with one having a different size in the press machine 1, the length of the clamp arm 7 in the longitudinal direction is determined by the slit 11 according to the size of the mold 6.
Or by changing the mounting position of the fulcrum bolt 8 to move the action point portion 7a to a position corresponding to the flange portion 6a of the die 6. If the point 7a cannot be moved to a position corresponding to the flange 6a of the mold 6, the clamp arm 7 is replaced with one having a different length. The hydraulic cylinder 9
Is removably mounted in the cylinder mounting hole 14, the hydraulic cylinder 9 is removed from the clamp arm 7 and only the clamp arm 7 is replaced. For this reason, only a plurality of sets of the clamp arms 7 that can be manufactured at a low cost need to be prepared, which is economically advantageous. Also, with the pipe to the hydraulic cylinder 9 connected, the clamp arm 7
Can be replaced, so that the mold replacement work can be simplified. Further, by simply replacing the spacer member 21 with one having a different thickness, the flange portion 6a can be easily clamped even when the thickness of the flange portion 6a is different.

Next, a modified example in which the configuration of the clamp device 9 is partially changed will be described. The same members as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof will be omitted. [1] Instead of the hydraulic cylinder 9, a hydraulic oil chamber 30 is formed below the piston member 16 like a hydraulic cylinder 9A shown in FIG. The member 31 is attached, and the spring member 31 is attached.
The clamping device 9A configured to clamp the flange portion 6a by driving the piston rod 17 downward with the elastic force described above and to release the clamp by supplying hydraulic pressure to the hydraulic oil chamber 30 may be used. . [2] Instead of the clamp arm 7, a clamp arm 7A having a long slot 32 formed in the right and left direction may be used at the right side, like the clamp arm 7A shown in FIG. In this case, by not making the left end of the clamp arm 7A bifurcate, it is possible to prevent a decrease in the strength of the clamp arm 7A.

[3] Instead of the clamp arm 7,
As shown in the clamp arm 7B shown in FIG. 6, an elongated hole 33 is formed in the right portion in the left-right direction, and an insertion hole 33 through which a fixed fulcrum 8a of the fulcrum bolt 8 can be inserted into the left end of the elongated hole 33.
You may use the clamp arm 7B in which a was formed. [4] Instead of the spacer member 21, like the spacer member 21A shown in FIG.
3 has a substantially cylindrical tubular portion 34 capable of detachably storing the same 3 and a cylindrical small-diameter portion 35 inserted into the cylinder mounting hole 14 and held in the cylinder mounting hole 14 via the O-link 15. It is also possible to use a spacer member 21A in which the upper end of the cylindrical portion 34 is in contact with the force applying portion 7A from below, and the lower end of the cylindrical portion 34 is in contact with the locking flange 20 from above. In this case, the cylinder body 13 is detachably attached to the spacer member 21A. However, even when the thickness of the flange portion 6a of the mold 6 is extremely large, the mold 6 can be clamped by the clamp device 5.

In this embodiment, the present invention is applied to the clamp device 5 for fixing the die 6 to the bolster 2 of the press machine 1. However, the die is fixed to a die fixing plate such as an injection molding machine. The present invention can be similarly applied to a clamp device for performing clamping and a clamp device for fixing a clamp object such as a work or a tool in various machine tools or industrial machines.

[Brief description of the drawings]

FIG. 1 is a plan view of a bolster of a press machine.

FIG. 2 is a longitudinal sectional view of a clamp device and its vicinity.

FIG. 3 is a plan view of the clamp device.

FIG. 4 is a longitudinal sectional view of a hydraulic cylinder according to a modification and its vicinity.

FIG. 5 is a plan view of a clamp device according to a modification.

FIG. 6 is a plan view of a clamp device according to a modification.

FIG. 7 is a diagram corresponding to FIG. 2 of a clamp device according to a modification.

[Explanation of symbols]

 2 Bolster 3 Board surface 5 Clamping device 6 Mold 7 Clamp arm 7b Support point 7a Action point 7c Force point 8 Support bolt 8a Fixed support 9 Hydraulic cylinder 13 Cylinder body 14 Cylinder mounting hole 15 O-ring 17 Piston rod 20 Lock flange 21 Spacer member

Claims (2)

(57) [Scope of request for utility model registration] 1. A fulcrum bolt is detachably erected on a board surface for fixing an object to be clamped, a force point portion is provided at a base end portion of the clamp arm, an action point portion is provided at a distal end portion, and a fulcrum portion is provided at an intermediate portion in the length direction. Are formed respectively, and a slit is formed in the distal end portion of the clamp arm and in the middle of the length direction so that the fulcrum bolt is inserted so as to be relatively movable in the length direction. Wear it upright,
In a clamping device, a rod of a clamp cylinder is advanced toward a board surface and a fulcrum of a clamp arm is supported from above by a fixed fulcrum at the top of a fulcrum bolt. Forming a stopper flange, forming the cylinder mounting hole slightly larger in diameter than the outer diameter of the cylinder body, removably mounting a clamping cylinder in the cylinder mounting hole from below, and mounting the cylinder body in the cylinder mounting hole. A clamp device equipped with a friction material for preventing falling off. 2. The clamping device according to claim 1, wherein a spacer member for adjusting a height is detachably mounted between a force point portion of the clamp arm and a locking flange of a clamping cylinder.