JPH06262578A - Manufacture of expander used in grab for parts and the like - Google Patents

Abstract

PURPOSE:To manufacture an expander excellent in durability easily and inexpensively even under the specific environment and service conditions. CONSTITUTION:A second sheet 4 consisting of a rubber material different in type of a first sheet 1 with a reinforced cord 3 is superposed on this first sheet 1 consisting of another rubber material serving as a contact surface layer forming a surface in contact with parts and the like via a bonding agent 2. Next, these first and second sheets 1 and 4 superposed on each other in an unvulcanized state are joined together simultaneously with vulcanization.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inflating surface of an inflatable body, in which both ends of an inflatable body having openings at both ends are hermetically attached to a base body, and a fluid is injected into a sealed space between the inflatable body and the base body for expansion. The present invention relates to a method for manufacturing an inflatable body used in a device for grasping parts and the like.

[0002]

2. Description of the Related Art The environment in which a conventional gripping device is used is
Generally, it is at room temperature and in the air, so the tube used as an expander has excellent fatigue resistance, NR / BR type, CR
I am using a rubber material. An expander made of only such a material is inferior in terms of durability, holding power for parts, etc., dimensional stability, etc. Therefore, a reinforcing cord is embedded in a rubber material to improve durability etc. Is also known. In addition, under a special environment or use condition such as holding petroleum-based lubricating oil, organic solvent, hot water, steam, acid, alkali, sharp parts, etc., durability is inferior even when using a tube with a cord. Therefore, it is known to coat the expansion surface of the tube with a special material or to attach a special rubber to the surface of the tube after vulcanization molding.

[0003]

In order to coat the tube with a special material or to manufacture an inflatable body with a special rubber attached, the number of steps is increased and the cost is increased. Further, the material added to the tube after vulcanization molding by coating or pasting may be peeled off in a short period of time due to repeated expansion and contraction of the expandable body.

Therefore, an object of the present invention is to provide a method for manufacturing an expandable body which can easily and inexpensively manufacture an expandable body excellent in durability even under a special environment or use condition.

[0005]

In order to achieve the above-mentioned object, the present invention provides a first sheet formed of a rubber material and having a reinforcing cord, which forms a surface for contacting parts and the like.
A second sheet made of a rubber material different from the sheet is superposed with an adhesive interposed, and the first sheet and the second sheet superposed in an unvulcanized state are adhered at the same time as the vulcanization. It is a thing.

[0006]

In the present invention, the first and second sheets made of different kinds of rubber materials are overlapped with each other via the adhesive and then adhered simultaneously with the vulcanization, so that the tube is coated with a special material or a special material. It is possible to manufacture an expansive body having a multi-layer structure more easily and in a shorter time than the operation of sticking rubber.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, an adhesive 2 is applied to a first sheet 1 which serves as an adhesive surface layer which forms a surface contacting parts and the like,
The second sheet 4 in which the reinforcing cord 3 is put in the first sheet 1
Overlap. It is efficient to overlap the mandrel 5 described later while winding it. First sheet 1 is EP
A DM / IIR rubber material was used, and a CR rubber material was used for the second sheet 4. Also, reinforcement cord 3
An organic fiber was used as. The second sheet 4 forms a rubberized cord layer, which is, so to speak, a rubber material drawn on organic fibers.

As shown in FIG. 1, a second sheet 4 made of a rubber material different from the first sheet 1 containing the reinforcing cords 3 is superposed on the first sheet 1 with a vulcanizing adhesive 2 interposed therebetween. After that, or at the same time, the mandrel 5 made of aluminum is wrapped around, and then vulcanized by a vulcanizing can.

A vulcanization can, which is adhered at the same time as vulcanization, forms a tubular expander 10 as shown in FIG. As the adhesive 2 used here, THIXON 511-T manufactured by SIXON INC. Was used.

The solvent resistance, chemical resistance and heat resistance of the rubber material used for the first sheet 1 and the second sheet 4 are as shown in the following table.

[0012]

[Table 1]

[0013] In the table, ◯ indicates usable, Δ indicates tolerable to some extent, and X indicates unusable. It is known that rubber undergoes a phenomenon of swelling when it is immersed in a solvent or left in a solvent atmosphere, and its physical properties are extremely deteriorated.
In general, the solvent resistance of rubber is as shown in the above table, and the chemical resistance is also as shown in the above table. Therefore, the rubber material used as the first sheet 1 is selected from the above table depending on the environment in which it is used.

The expansive body 10 manufactured in this manner is
As shown in FIG. 4, the lower end of the base body 11 is inserted from one end side of the inflatable body 10, and one end side of the inflatable body 10 is caulked.
Then, the expansion body 10 is folded back and the other end is fixed to the upper end side of the base body 11 by the caulking ring 13. Therefore, the first sheet 1 of the expandable body 10 appears on the front side. A flow path 14 for a fluid such as air is formed in the base 11, and by injecting a fluid such as air into the flow path 14, the fluid flows into the sealed space between the expander 10 and the base 11, The expander 10 expands outward. A part or the like is grasped on this expanded surface. With such a grasping device, for example, the photosensitive drum of a copying machine is grasped in a solvent atmosphere. This solvent is ketone type or alcohol type,
If it is an ether type, an ester type, an aldehyde type, or an amine type, EPDM / IIR is used as the rubber material of the first sheet 1.
The use of system rubbers is preferred. In order to grip the photosensitive drum using the gripping device as shown in FIG. 4, the device is inserted into the hollow portion of the photosensitive drum, and a fluid is injected to expand the expander 10 so that the inner circumference of the hollow portion is increased. Expansion body 1 on the surface
By bringing the outer surface of 0 into pressure contact, the photosensitive drum can be moved together with the movement of the gripping device.

FIG. 5 shows a structure in which a hollow cylinder is used as the base 11, and the expander 10 expands on the inner surface side of the base 11. A part such as a pipe penetrates the base 11. It is to be inserted into a hole and the expansion body 10 is expanded to grab the outer peripheral surface of a pipe or the like.

The expander 10 shown in FIG. 3 has a two-layer structure, but a sheet made of another rubber material may be laminated on the outer side of the second sheet 4 containing the reinforcing cord 3. For example, a first sheet 1 made of EPDM / IIR type rubber is wound around a mandrel 5, an adhesive 2 is applied to the outer peripheral surface of the first sheet 1, and then a sheet made of a CR type rubber material is wound around the mandrel 5. It is also possible to wind the second sheet 4 in which the reinforcing cord 3 of the system is embedded, and further to wind a sheet made of a CR type rubber material to form a four-layer structure. Sufficient adhesion is possible only by vulcanization if CR-based rubbers are used together.

Even when the rubber material forming the second sheet 4 and the reinforcing cord 3 have a weak adhesive force and it is difficult to embed the reinforcing cord 3 directly in the rubber material, an adhesive agent is applied between the first sheet 1 and the rubber material. Since the first and second sheets 1 and 4 are superposed on each other in an unvulcanized state with the interposition of 2 and then bonded simultaneously with vulcanization, the rubber material and the reinforcing cord 3 can be easily integrated. The reinforcing cords 3 may be arranged in parallel with each other or may be arranged so as to be crossed and diagonally intersect each other.
It is also possible to have more layers.

[0018]

As described above, according to the present invention, the first sheet made of a rubber material is formed of a rubber material of a different kind from the first sheet made of a rubber material while forming a surface for contacting parts and the like. The first of the two sheets is overlaid in an unvulcanized state with an adhesive agent interposed therebetween.
Since the sheet and the second sheet are adhered at the same time as vulcanization, the number of steps is reduced compared to the case of coating or adhering a special material on the tube surface after vulcanization molding, and it is possible to manufacture at low cost and peeling. There is no problem such as. It is possible to provide an inflatable body having excellent durability even under a special environment. In addition, rubber materials used in special environments are often expensive. Compared to a one-layer structure in which a reinforcing cord is embedded in such an expensive rubber material, an inexpensive rubber material By forming the two sheets, even if the first sheet is an expensive rubber material, the amount used is small, and the price of the entire expander is reduced. Further, if the different rubber materials are simply vulcanized, the two materials cannot be completely adhered to each other, and air may be mixed between the different rubber materials. Reliable adhesion is achieved by interposing an adhesive between the sheet and the sheet.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which a first sheet and a second sheet are stacked with an adhesive agent interposed therebetween.

FIG. 2 is a sectional view of a state in which a first sheet and a second sheet are wound around a mandrel.

FIG. 3 is a cross-sectional view of an inflatable body taken out from a mandrel after being bonded simultaneously with vulcanization.

FIG. 4 is a cross-sectional view showing an example of a gripping device using the expander shown in FIG.

5 is a cross-sectional view showing another example of the gripping device using the expander shown in FIG.

[Explanation of symbols]

 1 1st sheet 2 Adhesive 3 Reinforcement cord 4 2nd sheet

Claims (1)

[Claims] 1. A device for sealingly attaching both ends of an expander having openings at both ends to a base body, and injecting a fluid into a sealed space between the expander and the base body to grasp a component or the like by an expansion surface of the expanded body. In the method of manufacturing an inflatable body used for, a first sheet made of a rubber material and a second sheet made of a rubber material of a different kind from the first sheet made of a rubber material are formed between the first sheet made of a rubber material and the surface. A method for manufacturing an inflatable body for use in a gripping device for parts or the like, characterized in that the first sheet and the second sheet, which are superposed in an unvulcanized state, are adhered at the same time as vulcanization, with an adhesive interposed therebetween.