JPS6220021B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is designed to prevent electric, gas, and water pipes buried underground or in buildings from being damaged when cracks or gaps occur due to damage to the pipe walls. The present invention relates to a rubber bag for injecting a chemical liquid, which constitutes a part of a liquid chemical injection device, which is used when repairing the bag by filling it with a chemical liquid, and a method for manufacturing the same.

Conventionally, in this type of rubber bag, a rubber cylinder containing a blade was provided concentrically with a pressurized chamber outside a metal inner cylinder, and the bottom holes at both ends of the rubber cylinder were glued to a part of the outer peripheral surface of the metal cylinder. It is something.

This rubber bag is made by wrapping an unvulcanized rubber body around a metal cylinder, pressing the rubber body from the outside with a mold, pressing it against the mold from the inside with air pressure, and then vulcanizing it. It has a predetermined shape.

In such products, the adhesive strength between the rubber cylinder and the metal cylinder is low, and the adhesive strength between the rubber cylinder and the reinforcing cloth inserted therein is also insufficient. The internal pressure at
The limit is Kg/ ^cm2 .

This is insufficient for the above-mentioned rubber bag for injecting liquid medicine.

The object of the present invention is to improve the above-mentioned drawbacks of the conventional rubber bags and to obtain a rubber bag that can withstand an internal pressure of 7 to 10 kg/cm ² .

Its structure consists of a rubber cylinder with a blade installed concentrically on the outside of a metal cylinder with a pressurizing chamber apart, and both end surfaces of the rubber cylinder fitted into the outer periphery of the metal cylinder and attached to a rubber bag for drug injection. Circumferential grooves are formed on the outer periphery of the metal cylinder corresponding to the bottom holes at both ends of the rubber cylinder, and axially rising edges and radially inward edges are formed at the bottom holes at both ends of the rubber cylinder. The inward edges are baked and bonded to the outer circumferential surface of the metal cylinder, and the inward edges are fitted into the circumferential groove of the metal cylinder and bonded by baking, and the inward edges are baked and bonded to the outer peripheral surface of the metal cylinder. An air pipe is connected from the inside of a metal cylinder.

Further, unvulcanized rubber sheets are pasted on both sides of a bowl-shaped blade having a bottom hole with an inward edge to form a pair of bowl-shaped rubber bodies, and metal cylinders are fitted into the bottom holes of the bowl-shaped rubber bodies, respectively. Then, in this state, press molding and primary vulcanization are performed to bond them by baking, and then the ends of the pair of metal cylinders are fitted so as to face each other, and the end edges of each of the bowl-shaped bodies are made to face each other. In this method, the outer surface of the fitting portion of the rubber bag is pressurized with a mold and the inner surface is pressurized with air pressure, and in this state, secondary vulcanization is performed to bond by baking.

To explain the above with reference to the embodiment shown in the attached drawings, a metal cylinder 3 with a circumferential groove 6 is attached to a pair of bowl-shaped rubber bodies 2, 2a containing a blade 1 having an inward edge 2a and a bottom hole 2b. . The adhesive surfaces 8, 8' of the edge parts of the bowl-shaped rubber bodies 2, 2' are fitted together and bonded by secondary vulcanization, and the bonded pair of bowl-shaped rubber bodies 2, 2' are bonded together. A rubber cylinder 2c consisting of
A pressurizing chamber 18 is formed between the inside of the metal cylinder 3, 3' and the outside of the metal cylinder 3, 3', and one end of the air pipe 7 is communicated with the pressurizing chamber 18 from the inside of the metal cylinder 3'. be.

Further, the above-mentioned manufacturing method will be described below with reference to the embodiments shown in the accompanying drawings.

(1) Apply rubber adhesive to blade 1 (reinforcing cloth), dry it, and cut it to a specified size.

(2) The blade 1 is molded into a substantially bowl shape as shown in FIG. 1 using a mold (not shown), and cut at the cross mark to form a bowl shape having a raised edge 1a and a bottom hole 1b. Obtain Blade 1.

(3) Apply the rubber adhesive again to the blade 1 and dry it.

(4) Attach several unvulcanized rubber sheets to both sides of the blade 1 in (3) above and press them using a stitcher (a crimping tool with small wheels) to form a bottom hole with a rising edge 2a. A bowl-shaped rubber body 2, 2' having 2b is made.

(5) Taper the joints 4, 4' at the ends of the pair of metal cylinders 3, 3' as shown in FIG.

(6) A circumferential groove 6 into which the protrusions 5 of the bowl-shaped rubber bodies 2, 2' are inserted is provided on the intermediate outer periphery of the cylinder 3, and a pipe 7 is provided leading from the inside of the cylinder to the inside of the bowl-shaped rubber body 2'.

(7) Clean the area on the outer periphery of the cylinder 3 where the bowl-shaped rubber body 2 will be adhered, and apply vulcanized adhesive to that area.

(8) The bowl-shaped rubber bodies 2, 2' obtained in the above (4) and the cylinders 3, 3' obtained in the above (7) are combined as shown in Fig. 2, and the assembled product is Get a pair of left and right.

(9) The combination is put into left and right molds separately and press-molded, and at the same time the bowl-shaped rubber bodies 2, 2' are first vulcanized, the outer periphery of the cylinders 3, 3' and the groove 6 are The inner surface of the rising edge 2b and the protrusion 5 are bonded by baking.

(10) After cleaning the joints 4 and 4' of the cylinders 3 and 3', apply sealant.

(11) After buffing the facing adhesive surfaces 8, 8' of the edge parts of the bowl-shaped rubber bodies 2, 2', apply a rubber adhesive there, dry it, and then apply an unvulcanized adhesive. Apply rubber.

(12) The cylinders 3, 3' treated in the above (10) are butted together, and the joints 4, 4' are bonded by press-fitting with a press to form the bowl-shaped rubber bodies 2, 2' treated in the above (11). The adhesive surfaces 8 and 8' are overlapped and pressed together using a stitcher.

(13) As shown in Fig. 3, the semi-finished product obtained in the above (12) is placed in the secondary molding molds 9 and 10, and a rubber cylinder consisting of the bowl-shaped rubber bodies 2 and 2' is formed using the pipe 7. Air is introduced into the pressurizing chamber 18 of 2c to apply internal pressure, and the bowl-shaped rubber bodies 2, 2' are bonded to the inner surfaces of the secondary molding molds 9, 10 through secondary vulcanization bonding to form the present invention. Obtain a rubber bag for drug injection.

The chemical liquid injection device in which the rubber bags of the present invention are arranged in series will be explained with reference to FIGS. 4 to 8. A pipe 11 for feeding high pressure air is connected to the air pipes 7 of the rubber bags 2-1 and 2-3 on both sides, which are arranged in a straight line, and a pipe 12 is connected to the air pipe 7 of the rubber bag 2-2 in the center. A chemical liquid injection pipe 13 and a nozzle 14 communicating therewith are provided in the cylinder 3 so that the chemical liquid can be injected into the outside of the central rubber bag 2-2.

In the figure, reference numeral 15 indicates the lids provided at both ends of the circular tube 3, 16 indicates a rod for connecting the respective circular tubes 3 to the lids 15 at both ends, and 17 indicates a tube to be repaired.

To explain how to use this chemical injection device, first place the device as shown in Fig. 4 inside a pipe 17 to be repaired, such as a damaged electrical conduit pipe, water pipe, gas pipe, etc. that has cracks or perforations. Air is introduced into the rubber bags 2-1 and 2-3 on both sides through the pipe 11 and the air pipe 7 to inflate them.
1, 2-3 are brought into close contact with the inner wall of the pipe 17 to be repaired.

Next, the outer periphery of the central rubber bag 2-2 and the repair pipe 1
7 and into the space between the rubber bags 2-1 and 2-3 on both sides, a chemical solution such as a mixed solution of an epoxy resin and its curing agent is injected from the nozzle 14. .

Furthermore, air is fed into the central rubber bag 2-2 through the air pipe 7 and the pipe 12 to expand it and allow the chemical solution to penetrate into the damaged parts (cracks, gaps, perforations, etc.) of the repair pipe 17. and fill it there.

After a certain period of time, the chemical solution solidifies and closes the damaged area, and then each rubber bag 2-1, 2-2, 2-3
The air is removed from the air, the chemical injection device is moved, and the air is removed from the repair tube 17 to complete the repair.

The present invention has the above-mentioned configuration, in which unvulcanized rubber sheets are bonded to both sides of the blade 1, and a bowl-shaped rubber body 2 is formed by press molding to have a raised edge 2a and a bottom hole 2b with a radially inward protrusion 5. , 2' were made, and the bowl-shaped rubber bodies 2 and 2' were fitted into separate cylinders, press-molded, and primary vulcanized and baked to improve the adhesive strength between the cylinder and the bowl-shaped rubber body. At the same time, the blade and the bowl-shaped rubber bodies 2, 2' can be integrally formed, and the adhesive surfaces 8, 8' of the end edges of the pair of bowl-shaped rubber bodies 2, 2' are fitted together. Since it is bonded by secondary vulcanization, its strength is improved compared to the conventional rubber bag, and it can weigh 7 to 10 kg/
Can withstand internal pressure of cm.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a molded blade, Figure 2 is a cross-sectional view of a pair of metal cylinders in which bowl-shaped rubber bodies containing blades are combined and opposed to each other.
The figure is a cross-sectional view showing the state in which a bowl-shaped rubber body is subjected to secondary vulcanization in a mold, FIG. Figure 5 is a longitudinal cross-sectional view of the drug injection device.
Figures 6, 7, and 8 are A-A' and B of Figure 5.
-B' and C-C' line sections are shown. 1... Grade, 2, 2'... Bowl-shaped rubber body, 2
a...Rising edge, 2b...Bottom hole, 2-1, 2-
2, 2-3...Rubber bag, 3,3'...Metal cylinder, 4,4'...Joint part, 5...Protrusion, 6...
Groove, 7... Air pipe, 8... Adhesive surface, 9, 10
...Molding mold, 11, 12...Pipe, 13...
Chemical injection pipe, 14...nozzle, 15...lid,
16...rod, 17...repair pipe.

Claims (1)

[Scope of Claims] 1. A rubber cylinder containing a blade is provided concentrically with a pressurizing chamber on the outside of the metal cylinder, and the bottom holes at both ends of the rubber cylinder are fitted and bonded to the outer periphery of the metal cylinder. In the rubber bag for liquid injection, circumferential grooves are formed on the outer periphery of the metal cylinder corresponding to the bottom holes at both ends of the rubber cylinder, and rising edges in the axial direction are provided at the bottom holes at both ends of the rubber cylinder. Inward protrusions in the radial direction are respectively formed, the rising edges are baked and bonded to the outer peripheral surface of the metal cylinder, and the inward protrusions are fitted into the circumferential groove of the metal cylinder and bonded by baking, and the above-mentioned A rubber bag for injecting chemical liquids with an air pipe connected to the pressurized chamber from the inside of the metal cylinder. 2 A pair of bowl-shaped rubber bodies are formed by pasting unvulcanized rubber sheets on both sides of a bowl-shaped blade having a bottom hole with an inward edge, and a metal cylinder is fitted into each of the bottom holes of the bowl-shaped rubber bodies. Then, in this state, press molding and primary vulcanization are performed to bond them by baking, and then the ends of the pair of metal cylinders are fitted so as to face each other, and the edges of each of the bowl-shaped bodies are made to face each other. A chemical injection method characterized in that the outer surface of the fitting portion of the rubber bag is pressurized with a mold and the inner surface is pressurized with air pressure, and in that state, secondary vulcanization is performed to bond by baking. Method of manufacturing rubber bags for use.