JP3901818B2 - Work gripping device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
This invention aims to provide a gripping device of a work which is fixed at both ends of the inflatable tube by injecting a fluid into injectable and the hard substrate a flow body.
[0002]
[Prior art]
As an apparatus for expanding a tube and grasping a workpiece such as a part on its expansion surface, an apparatus for expanding the tube to the outside and an apparatus for expanding the tube to the inside are known. As a device for expanding the tube to the outside, the one described in Japanese Patent Publication No. 7-2579 is known, in which the lower end of the tube is folded back and fixed to the rigid base with a caulking ring, and the upper end of the tube is not folded back. It is fixed to a rigid base with a caulking ring, and when the fluid is injected into the tube and expanded, the folded portion of the tube rises, and the tube is arcuate outward (laterally) between the two caulking rings. It exhibits an expansion surface and expands. Further, as an apparatus for inflating a tube inwardly, a device described in JP-A-63-7289 is known. The tube body is provided with a tube body having a substantially uniform wall thickness at both ends so as to cover and be in close contact with or close to the flat inner peripheral surface of the hollow cylindrical hard main body, and the upper and lower edges of the tube body. Folded the upper and lower edges of the rigid body part, and fixed to the outside of the rigid body part with a slight gap from the edge to seal the tube body and inject fluid into the rigid body part An inlet is formed, a workpiece such as a component is set in a space surrounded by the tube body, and the tube body is expanded by fluid injection so that the workpiece such as a component is grasped. In this conventional apparatus, the upper and lower edges of the tube body are folded back and fixed on the outside of the hard main body, and the tube body is in contact with (or very close to) the flat inner peripheral surface of the hard main body. Therefore, even if the injection pressure of gas or the like is increased, the tube body is securely fixed, and the tube body has excellent responsiveness for expansion and contraction. The effective inner diameter can be increased, and even when a workpiece such as a part is inserted into the tube body, even if it hits the end of the hard main body, this end is covered with the upper and lower edges of the tube, so there is a buffering effect. There is no possibility of damaging workpieces such as parts.
[0003]
[Problems to be solved by the invention]
The tubes used in the above-mentioned conventional devices are both tubes with uniform wall thickness at both ends. One end of this tube is folded or both ends are bent, and fixed to a rigid base or rigid body. The shape before this was a cylindrical shape with the same diameter across the top and bottom and a uniform thickness, and the inner and outer peripheral surfaces were flat across the upper and lower ends. Therefore, when the tube was expanded, the middle part between the caulking rings swelled the largest in the radial direction, and the bulging became smaller as the caulking ring was approached, and the boundary of the contact surface with the parts was curved. . When a workpiece such as a part to be grasped is a preform when a bottle or bottle with a screw formed on the outer periphery of the mouth is formed by blow molding, air is blown into the preform in the mold to form a bottle or bottle. When forming the mouth part of the shape, it is difficult to mold the threaded part engraved on the outer periphery of the mouth only with air pressure, so the tube part of the device is expanded by grasping the mouth part of the preform Make pressure contact with the mold from the inside. At this time, in the conventional gripping device, the preform cannot be pressed with a uniform force on the threaded portion engraved on the mold, and the mouth formed when the preform is cured has an expanded shape of the tube, that is, an arc shape. It sometimes imitates the curved shape.
[0004]
Therefore, this invention, in place in contact with the work of the expansion surface of the tube, and an object thereof is to provide a gripping device of a work which was made to pressure contact force GaHitoshi one tube expansion surface.
[0005]
[Means for Solving the Problems]
Expansion To achieve the above object, the present invention is a gripping device of a work which is fixed at both ends of the inflatable tube by injecting a fluid into injectable and the hard substrate a flow body, to near both ends of the open ends Tube Concave ridges that are recessed over the entire circumference are formed on the opposite side of the direction, and expansion pressure contact portions that press against the workpiece during expansion are formed between these ridge portions, and the ends of the tube ridges are formed at both ends of the hard base. The both ends of the tube are bent and pressed to form grooves for receiving the back of the concave portion of the tube on the outer peripheral surface near the both ends of the hard base, the head is pressed against both ends of the hard base, and the tip of the body is the tube A lid that extends to the groove and leaves a space in the groove is attached, and when the tube is inflated, the expansion of the groove is partially restricted at the tip of the body of the lid and part of the groove that leads to the expansion pressure contact part Is expanded and pressure welded The entire workpiece is obtained by pressure contact with a uniform force.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described below with reference to the drawings.
[0007]
In the embodiment shown in FIG. 1 are fixed to both ends of the inflatable tube 2 by the injection of fluid into the rigid substrate 1 which enables injecting fluid body, on the side opposite to the expansion direction near both ends of the tube 2 A recessed strip 3 that is recessed over the entire circumference is formed. An expansion pressure contact portion 4 that presses against a component or the like, that is, the workpiece 10 at the time of expansion is formed between the concave stripe portions 3. Moreover, the latching | locking part 5 along an axial direction is formed in the both ends of the tube 2, and the both ends of the tube 2 are formed in the T shape. A groove 6 for receiving the back surface of the concave portion 3 of the tube 2 is formed on the outer peripheral surface near both ends of the hard base 1, and the concave portion 3 is fitted into the groove 6. Further, a lid 7 is attached to both ends of the hard base 1 so that the head 8 is pressed against both ends of the tube 2 and the tip of the body portion 9 extends to the concave portion 3 of the tube 2. The front end of the body portion 9 of the lid body 7 protrudes toward the concave stripe portion 3, that is, enters a part of the space of the concave stripe portion 3, and this protruding portion is a U-shaped space of the concave stripe portion 3. It is not supposed to block everything. In other words, the flow body is adapted to be places where the formation of the concave portion 3 has room to swell the tip of the body portion 9 without being fully regulated remain when the tube 2 is injected into the tube 2 is inflated. During the expansion of the tube 2, the expansion of a part of the concave portion 3 is partially restricted by the tip of the body portion 9, but the portion of the concave portion 3 connected to the expansion pressure contact portion 4 expands to expand the expansion pressure contact portion 4. Do not pull both ends of. Bolts 11 were used to attach the lid 7 to the hard main body 1. A fluid inlet 12 is formed in one of the lids 7, and a fluid is supplied to the fluid channel 14 of the hard main body 1 by obtaining a fluid channel 13 from the inlet 12. The outlet side of the flow path 14 is provided to face the intermediate portion of the expansion pressure contact portion 4 of the tube 2. The locking portions 5 formed at both ends of the tube 2 are fitted into grooves formed in the lid body 7 and the hard main body 1, respectively, and both ends of the tube 2 bent at the both ends of the hard main body 1 are from the lid body 7. The hard main body 1 is pressed and fixed.
[0008]
FIG. 2 shows the tube 2 used in the embodiment of FIG. 1 and is not a cylindrical body having the same diameter over the upper and lower ends as in the conventionally used tube. In addition, the thickness of the tube 2 at the location where the concave portion 3 is formed and the thickness of the expansion pressure contact portion 4 are the same, but the thickness of the portion of the concave portion 3 is reduced so that it expands during expansion. It is desirable that the pressure contact portion 4 is sufficiently extended so as not to hinder the outward extension in the radial direction.
[0009]
In the embodiment shown in FIGS. 1 and 2, between the feeding fluid source (not shown) or al flow body inlet 12, the fluid and the tube 2 and the rigid base body 1 through the channels 13 and 14 And the tube 2 expands radially outward. At this time, the expansion pressure unit 4 approximately expands horizontally (see two-dot chain line in FIG. 1) between the concave portion 3 is pressed at a pressure of evenly with respect to the inner peripheral surface of the workpiece 10.
[0010]
The tube 2 shown in FIG. 3 shows what does not form the latching | locking part 5 in the both ends of the tube 2 like the tube 2 shown in FIG. An example using this tube 2 is shown in FIG. In the second embodiment shown in FIG. 4, a preform used for blow molding is shown as the workpiece 10. The blow molding die 20 is engraved with a screw portion 20A for a male screw to be formed at a portion corresponding to the mouth portion of the workpiece 10. When supplied with this embodiment smell Te flow body to the tube 2, press the workpiece 10 in the radial direction outer tube 2 is expanded, pressed against the die 20. When the tube 2 is expanded, the outer peripheral surface of the portion corresponding to the mouth portion of the workpiece 10 is pressed against the screw portion 20A of the mold 20 with a predetermined pressure. In this state, when the workpiece 10 which is a preform is cured, a male screw portion is formed at a portion of the workpiece 10 pressed against the screw portion 20A of the mold 20. In the figure, reference numeral 16 denotes an O-ring.
[0011]
FIG. 5 is a detailed cross-sectional view of a portion of the screw portion 20 </ b> A of the mold 20 in FIG. 4, and the upper and lower lid bodies 7 are attached to the hard base 1 with the fastening bolts 15.
[0012]
In the third embodiment shown in FIG. 6, the tube 2 is configured so as to expand inside the cylindrical hard base 1. Such a grasping device is suitable for grasping the mouth of the bottle as the work 10.
[0013]
FIG. 7 shows a fourth embodiment, in which the tube 2 expands inward as in the embodiment shown in FIG. 6, and the tube 2 has a locking portion 5 as shown in FIG. An example used is shown.
[0014]
It is preferable that the diameter of the portion extending vertically from the concave strip portion 3 of the tube 2 is smaller than the diameter of the expansion pressure contact portion 4. Further, the depth, size, or thickness of the concave strip portion 3 can be changed according to the expansion amount, the press contact pressure, or the like of the expansion press contact portion 4.
[0015]
【The invention's effect】
As described above, according to the present invention, concave portions that are depressed over the entire circumference on the opposite side of the expansion direction are formed near both ends of the tube at both ends, and the workpiece is pressed against the workpiece during expansion between these concave portions. Forming an expansion pressure contact portion, bending the both ends of the tube from the concave portion of the tube to both ends of the hard base, and forming a groove for receiving the back of the concave portion of the tube on the outer peripheral surface near both ends of the hard base, Attach the lid with the head pressed against both ends of the rigid base and the body end extending to the tube recess, and the expansion of the recess is partially restricted at the body end of the lid when the tube expands since some of the concave portions connected to the expansion pressure contact portion while being allowed to press-contact with a uniform force across inflation pressure unit decompresses the work and inflating the tube by injecting a flow body, there are concave portions In order to do so, the expansion pressure contact part between these concave parts is Expands in a generally horizontal direction without expanding in an arc, the pressure of the inflation pressure contact portion when pressed against the workpiece serves as an equalizing. As a result, when the preform used at the time of blow molding is a workpiece to be grasped, the preform portion to which the expansion pressure contact portion is pressed is not deformed into an arc shape and is pressed against a mold or the like while maintaining a substantially vertical surface. . Moreover, since the front-end | tip of the trunk | drum part of a cover body does not control the movement at the time of expansion | swelling of the concave part of a tube, it can prevent that an expansion | swelling press-contact part expand | swells in circular arc shape.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a first embodiment of the present invention.
FIG. 2 is a cross-sectional view of a tube.
FIG. 3 is a cross-sectional view showing a modified example of a tube.
FIG. 4 is a cross-sectional view showing a second embodiment.
FIG. 5 is a partially enlarged sectional view of a second embodiment.
FIG. 6 is a sectional view showing a third embodiment.
FIG. 7 is a cross-sectional view showing a fourth embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hard base | substrate 2 Tube 3 Concave part 4 Expansion pressure contact part 6 Groove 7 Lid body 8 Head 9 Body part 12 Inlet

Claims (1)

In gripping device of a work which is fixed at both ends of the inflatable tube by injecting a fluid into injectable and the hard substrate a flow body,
Form a concave ridge that is recessed over the entire circumference on the opposite side of the expansion direction near both ends of the tube at both ends,
An expansion pressure contact part that presses against the workpiece during expansion is formed between these concave strips,
Fold both ends of the tube from the concave streak to both ends of the hard base and press-contact,
Form a groove for receiving the back of the concave portion of the tube on the outer peripheral surface near both ends of the hard base,
Attach the lid with the head pressed against both ends of the rigid base and the body end extending to the tube recess, and the expansion of the recess is partially restricted at the body end of the lid when the tube expands In addition, a workpiece gripping device characterized in that a part of the concave portion connected to the expansion pressure contact portion is extended to press the entire expansion pressure contact portion against the workpiece with a uniform force.

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