JP2689391B2 - Device for gripping parts - Google Patents

Description

Description: [Industrial field of use] The present invention relates to a gripping device suitable for gripping a cylinder block of an engine or a component such as a pipe having a tubular shape.

[Conventional technology]

Conventionally, as a device for gripping a component or the like, for example, a cylinder block, as shown in FIG. 10, a taper cone 101 is attached to a cylinder 100, and the taper cone 101 is freely inserted and retracted between a pair of metal claws 102, 102. Then, when the tapered cone 101 is advanced, the toes 102 of the metal nails 102, 102
When A and 102A are opened and the tapered cone 101 is retracted, the toes 102A and 102A are closed. This metal nail 10
The toes 102A and 102A of No. 2 and 102 are hooked on the bottom of the cylinder block so as to grasp the cylinder block. In such a conventional apparatus, the claws are easily bent or broken, and the claws sometimes fail to grip. Further toe
There is also a possibility that 102A and 102A may damage the inner surface of the cylinder block, and that the cylinder block is heavy and the movement of the metal claws 102 and 102 is fast, the mechanical portion of the gripping device is easily broken.

For parts and the like that require delicate handling, a means has been developed in which a flexible film such as rubber is expanded, and the expanded flexible film is pressed into a hole formed in the part and the like to be grasped. As shown in FIG. 11, a flexible film 103 in the shape of a bag is attached to a box body 104, and air is injected from a passage 105 of the box body 104 so that the flexible film is injected.
It was meant to inflate 103.

[Problem to be solved]

In the conventional gripping device using the flexible film 103, as shown in FIG. 12, even if the tip of the flexible film 103 is inserted into the hole 107 of the thin component 106 and expanded, the flexible film 103 does not have the hole 107. The part 106 was not firmly attached to the inner peripheral surface, and the component 106 could not be reliably grasped. Most of the flexible films 103 use a rubber bladder formed by a mold, and do not swell significantly due to injection of air (poor elasticity), have poor durability, and are relatively expensive. . In addition, since only one flexible film 103 is used, the flexible film 103 is for some reason caused.
There was a risk that the parts would fall and be destroyed when the hose was broken or a hose for piping for injecting air bursts. Further, when grasping a relatively long and heavy part, one flexible membrane 103 cannot sufficiently hold it, and the range of objects to be grasped is limited.

Therefore, the present invention has improved durability and can be grasped softly without damaging the components, etc., and moreover, the range of objects that can be grasped and grasped reliably is wide, and even if one tube fails, the components etc. can be reliably retained. An object is to provide a gripping device that can be held.

[Means for solving the problem]

In order to achieve the above-mentioned object, the present invention is to connect a plurality of tubes, each of which has an opening at both ends inflatable by injecting a fluid such as air, to a rigid core body in a sealed state, or to connect a plurality of tubes. Is attached to the core body and both ends of each tube are sealed, and fluid is injected into each sealed tube individually or in groups to expand the tube and grab parts, etc. After the lower end is attached to the core body by the caulking ring, the tube is turned over and the tube is attached by the caulking ring so that the folded-back portion of the tube is located below the attachment point of the lower end.

[Action]

According to this invention, a fluid such as air is injected into the tube from the fluid supply source through the piping hose or the like to expand the tube.
Even if one tube does not expand, the other part is sure to expand even if one tube does not expand because the parts etc. are grasped by the outer peripheral surface of this expanded tube and the outer peripheral surfaces of two or more tubes are pressed against the parts etc. at this time. Do not grab a part and drop it to destroy it. Further, since a part or the like is gripped by a plurality of tubes, the load that one tube bears is reduced, and the life is extended. Further, since the tube has the folded portion, the contact area of the tube with the component or the like can be increased when the tube is expanded, and a reliable gripping force is exhibited.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

In the first embodiment shown in FIG. 1, the ends of tubes 2 and 2 having openings at both ends are attached in a sealed state above and below one rigid core body 1. The core body 1 is formed with passages 3 and 3 for injecting a fluid such as air into the respective tubes 2 and 2, and piping hoses 4 and 4 are connected to the passages 3 and 3, Valves 5 and 5 are provided in the middle of these hoses 4 and 4, and a fluid supply source 6 is connected to the ends of the valves 5 and 5. The fluid such as air supplied from the fluid supply source 6 is supplied from the points of the valves 5 and 5 to the piping hose 4
4 and is introduced into the passages 3 and 3 to expand the tubes 2 and 2. FIG. 1 shows a state in which the part W is gripped. The tube 2 shown in the first embodiment is open at both ends, the inner peripheral surface of the one end 2A is closely attached to the outer peripheral surface of the core body 1, and the caulking ring 7 is attached in a sealed state. The other end 2B of the tube 2 is , Is folded back inward and is attached to the core body 1 in a sealed state by a caulking ring 8. The core body 1 is formed of an integrally formed plastic material or metal material. The tube 2 is made of a material such as rubber or plastic. When a fluid such as air is injected into such a tube 2, the tip end side (the other end 2B side of the tube 2) swells greatly, and even if the thin part as shown in FIG. The tip end side of 2 swells so that it can be reliably held. To attach the tube 2 as shown in FIG. 2, first attach the other end 2B to the core body 1 with the caulking ring 8, and then attach the tube 2
Turn upside down and raise one end 2A, and this one end 2A is attached to the core body 1 by the caulking ring 7, but the attachment position of the one end 2A is located below the caulking ring 8 at the folded portion 2C of the tube 1 (hangs down). Position it like this.
The caulking ring 7 is attached to the upper part of the contacting portion so that the inner peripheral surface on the upper side of the tube 2 turned upside down closely contacts the outer peripheral surface of the core body 1.
To fix one end 2A of the tube 2.

In a second embodiment shown in FIG. 3, a plurality of core bodies 1 each having one tube 2 attached thereto are prepared, and these are connected by a connecting member 9. Each of these tubes 2 is adapted to individually suck and discharge the fluid. As the core body 1 in the second embodiment, one integrally molded in the same manner as in the first embodiment is used, but as shown in FIG. 4, the core body 1 includes a front end member 1A and a rear end member 1B.
It can also consist of

In any of the embodiments described above, the tube 2
As the material of NR, NR / NB type and CR type rubbers, which are excellent in weather resistance and fatigue resistance, were used on the assumption that they are used in normal temperature atmosphere. However, such a rubber has a drawback that it swells and loses rubber elasticity when used in an organic solvent or a petroleum-based lubricating oil. Further, when used at a high temperature, there is a possibility that rubber properties may be reduced. Therefore, it is necessary to select the material of the tube 2 according to the use conditions. This selection is made as shown in the table below. Note that the same material selection can be performed even with a gripping device that has the tube 2 alone.

In addition, when gripping parts that come into contact with the human body such as foods, cosmetics, and medical products, or when gripping high-temperature parts, a tube 2 made of silicone rubber, which is characterized by non-contamination and heat resistance, is used. However, when the silicone rubber tube 2 is used, the following problems occur.

Since it is composed of silicon rubber alone, the shape when air is filled is not stable. Also, if more than 1kg / cm ² of air is filled, the rubber part will continue to expand and puncture at the end, so delicate air pressure control is required at 1kg / cm ² or less.

Since it is limited to use at low pressure, the workpiece gripping force is small and heavy workpieces cannot be transported.

Since silicon rubber alone is used, even small scratches can cause cracks to develop, resulting in low durability life.

Therefore, as a tube 2 for holding parts that come into contact with the human body, such as food products, cosmetics, medical products, etc., or for holding high-temperature parts, non-contamination, heat resistance, dimensional stability, and work gripping power are enhanced to improve durability. In order to satisfy the required characteristics for life extension, organic fibers or metal fibers such as steel are adhesively embedded in silicon rubber to form a cord 20 structure.

The tube 2 having such a structure is shown in FIGS.

In order to bond the silicone rubber and the cord 20 made of the organic fiber, the cord 20 made of the organic fiber is subjected to a dipping process with a dipping (immersion) solution called a primer.

The buried state of the cord 20 may be a bias structure as shown in FIGS. 6 and 7 or a radial structure as shown in FIGS. 8 and 9. The inclination angle θ shown in FIG. 6 is preferably 20 ° or less. Further, the cord 20 may be embedded not only in one layer (see FIG. 9) but also in two layers (see FIG. 7) or more. In the tube 2 in which the cord 20 is embedded in this way, the dimensional stability is improved, and the workable gripping force is increased by increasing the encapsulating internal pressure, which leads to the improvement of the durable life.

The cord 20 can be embedded in the tube 2 other than the silicone rubber tube 2. Further, the cord 20 may be embedded in the silicone rubber of the tube 2 of the gripping device having the tube 2 alone. .

〔effect〕

As described above, according to the present invention, a plurality of tubes each having an opening at both ends that can be expanded by injecting a fluid such as air are hermetically attached to a rigid core body, or a plurality of tubes are connected. Is attached to the core body to seal both ends of each tube, and the fluid is injected into each sealed tube individually or in multiple groups to expand the tubes and use the holes of parts etc. from the inside. Since the components are grasped, even if the mechanism for inflating one tube fails, the remaining mechanism can hold the components, so that the components do not drop and are destroyed. In addition, since a component or the like is gripped by a plurality of two or more gripping mechanisms during normal use, the load carried by one is small and the life is long. Further, since the tube has the folded portion, the contact area of the tube with the component or the like can be increased when the tube is expanded, and a reliable gripping force is exhibited.

[Brief description of the drawings]

1 is a sectional view showing a first embodiment of the present invention, FIG. 2 is an enlarged sectional view of a tube mounting portion, FIG. 3 is a sectional view showing a second embodiment, and FIG. 4 is a modification of a core body. 5 is a sectional view showing an embodiment using a tube with a cord, FIG. 6 is a developed view of the tube showing a buried state of the cord, FIG. 7 is a sectional view of FIG. 6, and FIG. The figure is a development view of the tube showing a state in which the cord is embedded differently from FIG. 6, FIG. 9 is a sectional view of FIG. 8, and FIG. 10 is a schematic front view showing a conventional example.
Similarly, FIG. 12 is a cross-sectional view showing a conventional example, and FIG. 12 is an explanatory view of a state in which thin parts are grasped by the conventional device shown in FIG. 1 ... Core body, 2 ... Tube, 2A ... One end, 2B ... Other end, 2C ... Folded portion, 3 ... Passage, 4 ... Piping tube, 6 ... Fluid supply source, 7,8 …… Caulking ring.

Claims (1)

(57) [Claims] 1. A plurality of tubes each having an opening at both ends that can be expanded by injecting a fluid such as air are hermetically attached to a hard core body, or a plurality of tubes are attached to the core body. Both ends of the tube are sealed, and fluid is injected into each sealed tube individually or in groups to expand the tube and grab parts, and the lower end of the tube is crimped to the core body. A gripping device for parts and the like, characterized in that the tube is turned over after being attached by means of a caulking ring so that the folded-back portion of the tube is located below the attachment point at the lower end.