JP2821105B2 - Device for gripping parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gripping device suitable for gripping parts such as a cylinder block and a tubular pipe of an engine.

[0002]

2. Description of the Related Art Conventionally, as an apparatus for gripping a part such as a cylinder block, as shown in FIG. 6, a taper cone 101 is attached to a cylinder 100, and this taper cone 101 is placed between a pair of metal claws 102, 102. When the tapered cone 101 is inserted, the toes 102A, 102A of the metal claws 102, 102 are opened, and when the tapered cone 101 is retracted, the toe 10 is inserted.
2A and 102A are closed. The toes 102A, 102A of the metal claws 102, 102 were hooked on the bottom of the cylinder block to grip the cylinder block. In such a conventional apparatus, the claws are easily bent or broken, and the claws sometimes fail to grip. Further, there is a possibility that the toes 102A may damage the inner surface of the cylinder block, and there is also a disadvantage that the mechanism portion of the gripping device is easily broken if the metal block 102 is fast moving due to the heavy cylinder block.

[0003] For parts and the like that require delicate handling, means for expanding a flexible film such as rubber and pressing the expanded flexible film against holes formed in the parts and the like have been developed. As shown in FIG. 7, a flexible film 103 using a rubber bladder formed by a mold is attached to a box 104.
The flexible membrane 103 is inflated by injecting air from the passage 105 of the box 104, and the inflated surface is pressed into a hole of the component or the like to grasp the component or the like.

[0004]

The conventional flexible film 103 made of a rubber bladder does not greatly expand (poor in elasticity) due to the injection of air, and is formed of a single rubber bladder. Was not stable. Further, when the air pressure of the filling air becomes high, it cannot be used at high pressure because it bursts. Therefore, since the use is limited to low pressure, the gripping force of the parts and the like is small, and it is not possible to grip and transport a heavy part and the like. Furthermore, since a single rubber is used, even a small scratch develops a crack, resulting in a short durability life.

Therefore, the present invention improves durability,
It can be grasped softly without damaging parts etc.,
Moreover, it is an object of the present invention to provide a gripping device that reliably grips and has a large gripping force for components and the like.

[0006]

In order to achieve the above-mentioned object, the present invention relates to a cylindrical core body having both ends opened, and a tube having both ends opened from the inner peripheral surface side of the core body. A gripping device for a part or the like which is folded back to the surface side to seal both ends of the tube, injects a fluid into the sealed tube, expands the tube in the cylinder of the core body, and grips a part, etc. Is buried, and the folded back portion of the tube,
The tube is folded back at both ends with a gap between both ends of the core body, and a plurality of reinforcing cores are provided with respect to the axis of the core body.
Mode is biased so that they cross each other.
Buried or buried in a radial structure, in a bias structure
Is set to 20 degrees or less .

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment in which a component W is configured to be gripped from the outside. The core body 1 is formed in a cylindrical shape with both ends opened, and the cylindrical core body 1 with both ends opened.
On the other hand, both ends of the tube 2 having both ends opened are bent from the inside to the outside and attached in the cylinder. Further, as shown in FIG. 1, the tube 2 is folded back and attached to the core body 1 so that a gap is formed between both ends of the core body 1 and the folded portion of the tube 2. A passage 3 for injecting a fluid such as air into the tube 2 is formed in the core body 1, a piping hose (not shown) is connected to the passage, and a valve (not shown) is provided in the middle of the hose 4. A fluid supply source (not shown) is connected to the end of the valve. When the tube 2 is attached to the core body 1, the folded ends of the tube 2 are brought into close contact with the outer peripheral surface of the core body 1 by a caulking ring 4, so that the inside of the tube 2 is sealed. The core body 1 is formed of a plastic material or a metal material which is integrally molded.

As the material of the tube 2, NR / NB-based and CR-based rubbers having excellent weather resistance and fatigue resistance are used on the premise that they are used in a normal temperature atmosphere. However, such a rubber has a disadvantage that when used in an organic solvent or a petroleum-based lubricating oil, it swells and loses rubber elasticity. 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.

[0010]

[Table 1]

FIG. 2 is an exploded view of the tube 2. In this tube 2, a plurality of reinforcing cords 20 are embedded so as to be crossed with respect to the axis of the core body 1 so as to cross each other. Is set to 20 degrees or less. FIG.
It is sectional drawing of this tube 2. FIG.

FIG. 4 is an exploded view of the tube 2 in which a plurality of reinforcing cords 20 are embedded so as to be parallel to the axis of the core body 1. FIG. 5 is a sectional view of the tube 2.

In the tube 2 shown in FIGS. 2 and 4, the diameter at one end on the opening side and the diameter on the other end are set to be the same. The embedding state of the reinforcing cord 20 may be a bias structure as described above, a radial structure,
The inclination angle of the reinforcing cord 20 in the case of the bias structure is 2
0 degrees or less is preferable. Further, the reinforcing cord 20 may be embedded not only in one layer (see FIG. 5) but also in two or more layers (see FIG. 3) in the thickness direction of the tube 2.
In the tube 2 in which the reinforcing cord 20 is embedded as described above,
The dimensional stability is improved, and the workable gripping force is increased by increasing the sealable internal pressure, which leads to an increase in the durability life.

[0014] Further, when gripping parts that touch the human body, such as food, cosmetics, and medical goods, or when gripping high-temperature parts,
A tube using silicone rubber, which is non-staining and heat resistant, is used. However, the use of a silicone rubber tube alone has the following disadvantages. Since it is composed of silicon rubber alone, the shape when air is filled is not stable. Further, when air of 1 kg / cm ² or more is enclosed, the rubber portion continuously expands and punctures at the end, so that delicate air pressure control at 1 kg / cm ² or less is required. 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 gripping parts that come into contact with the human body, such as for food, cosmetics, and medical goods, and gripping high-temperature parts, the tube 2 is non-staining, heat-resistant, dimensionally stable, and so on.
Metal fibers such as organic fibers or steel are bonded and buried in a silicon rubber material to satisfy the required characteristics of increasing the gripping force of the workpiece and increasing the durability life.

The reinforcing cord 20 made of an organic fiber is dipped with a dipping liquid called a primer in order to bond the reinforcing cord 20 made of a silicone rubber and the organic fiber.

[0017]

As described above, according to the present invention, a reinforcing cord is embedded in a tube, and a gap is provided between a folded portion of the tube and both ends of a core body. Ri Oh by folding the ends of the tube,
Multiple reinforcement cords cross each other around the axis of the core body
Or buried with bias structure so that
Embedded in the bias structure, and the inclination angle θ in the bias structure is 2
Since it is 0 degrees or less, a high-pressure fluid can be injected into the tube, and the expansion of the tube is restricted by the reinforcing cord, so that there is no danger of puncturing due to continued expansion, and the work gripping force increases. In addition, there is no danger of cracks developing from small scratches, and the durability life is improved. further,
The shape during fluid injection is stable. Furthermore, since both ends of the tube are folded back with a gap between the folded portion of the tube and both ends of the core body, the tube is greatly expanded by the injection of fluid, thereby also gripping the work. Power can be secured.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a preferred embodiment of the present invention.

FIG. 2 is a development view of a tube.

FIG. 3 is a sectional view of FIG. 2;

FIG. 4 is a developed view showing another example of the tube.

FIG. 5 is a sectional view of FIG. 4;

FIG. 6 is a schematic front view showing a conventional example.

FIG. 7 is a sectional view showing another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core body 2 Tube 20 Reinforcement cord

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B66C 1/46

Claims (1)

(57) [Claims] 1. A cylindrical core body (1) having both ends opened, a tube (2) having both ends opened, and both ends of the tube (2) being placed from the inner peripheral surface side of the core body (1) to the outer peripheral surface of the core body (1). The tube (2) is folded back to seal both ends, a fluid is injected into the sealed tube, and the tube (2) expands in the cylinder of the core body (1) to grasp the parts and the like. In the above (2), a reinforcing cord (20) is embedded in the tube (2), and a gap is provided between a folded portion of the tube (2) and both ends of the core body (1). The both ends of (2) are folded back , and a plurality of reinforcing cords (2
0) are inclined so as to cross each other
Buried or buried in a radial structure, in a bias structure
Characterized in that the inclination angle θ is not more than 20 degrees .