JPH0340273B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] This invention is applicable to pouring and drainage of ready-mixed concrete,
It relates to a rubber hose with a hard rubber layer suitable for use in suction, etc., and in particular, as a hose that does not cause problems with fluid pumping, suction, etc. due to deformation of the hose tip during on-site operations. Another object of the present invention is to provide the above-mentioned hose shape, which can be used as a cap-adhesive hose to which a cap can be attached simply, quickly, and with strong adhesive force, if necessary. [Prior art] The main types of conventional hoses can be roughly divided into: (a) Cloth-wrapped hoses, braided hoses, and ( b) Wire-containing hose (single line, double line) using woven fabric and wire as reinforcing material; (c) A cap fitting is attached to the hose in an unvulcanized state, and it is made into one piece by vulcanization. There are bandless hoses that are fixed by performing a primary connection. The above conventional hose is made of soft rubber, including the inner tube rubber, intermediate rubber, outer cover rubber, topping rubber, etc., except for the reinforcing material, and forms a flexible hose. For hoses of
The wired hoses shown in (b) all have the same composition over their entire length, and each hose has a flexible spout without a wire for insertion of a cap fitting at the end of the hose. As mentioned above, the tip of a flexible hose is a structure that can be easily deformed, and with the exception of bandless hoses, the fitting is usually attached to the soft rubber part of the opening of the hose tip. A commonly used method is to insert the rubber cover and secure it by tightening a band on the outer rubber cover. [Problems to be solved by the invention] Conventionally, in the case of fresh concrete pouring hoses, when used while moving in a narrow pouring area, concrete fluid directly spews out from the tip of the hose. , the tip of the hose may come into contact with obstacles such as protrusions or the ground at the ejection site and become deformed. In addition, drainage hoses and the like are also easily deformed, and may become crushed and deformed, causing problems in pumping, suctioning, and handling of fluids. Therefore, in such fields, there is a need for a structure that prevents deformation of the hose tip. In addition, all hoses are
It is a long-held desire of hose users to easily attach the cap fittings, but conventional cap fittings are attached directly to the cap fittings and the unvulcanized molded hose at the time of manufacture. There are two methods: one is to press-fit the flange tube into the mouth of the vulcanized hose, and the outer sheath is fixed with a band or attached with adhesive. . In this case, the attachment method using vulcanization adhesive has a large fastening force and is mainly used for hoses that pose a risk of leakage, high-pressure fluid pumping, etc.; , must be done during the manufacturing process and cannot be installed at the site of use. Additionally, the vulcanization bonding process is generally complex and expensive. On the other hand, post-processing attachment methods have the advantage of being able to be joined on-site, but their adhesive strength is low, so they can generally only be used for low-pressure fluids. Therefore, there is a need to develop a structure for the end of the hose that allows fittings to be attached easily and quickly with strong adhesive force using a post-processing attachment method. [Means for Solving the Problems] The inventors investigated the problems of the above-mentioned conventional hoses and determined the cause of the weak bonding force, which is the biggest drawback in the conventional post-processing attachment method for fittings. Unlike chemical adhesion, bonding is based on secondary adhesion (mechanical adhesion) between molecules. Of course, this depends on the cohesive force of the adhesive, but the biggest factor is that the end of the hose, that is, the fitting attachment part, is mainly made of soft rubber. That is, this is caused by the joining of a rigid body and a soft body. In addition, with the conventional insertion band tightening method,
It is very difficult to insert the fitting, and it is not easy to set it in the correct position in the field. Therefore, even if they are connected using an adhesive or the like so that they can be easily inserted dimensionally, the soft rubber layer, which easily deforms and moves, and the rigid cap fitting,
Their properties are contradictory, and even if an adhesive or the like is used, the soft rubber side moves easily, and the peelability of the joint is promoted by pressurization, and short-term separation between the two is unavoidable. In addition, with the clasp insertion band tightening method,
If you forcefully insert the hose into the soft rubber layer at the end of the hose when attaching the cap, or if you apply too much tightening pressure to the band, the rubber part will break, so it is not possible to apply a large tightening force. For the above reasons, the sealing pressure of the high-pressure fluid cannot be maintained. Therefore, the rubber hose of the present invention having a hard rubber layer eliminates the conventional method of inserting a fitting into the inner diameter of the end of the hose, and instead inserts the fitting on the outside of the hose, where it is easy to insert, using an adhesive. This method uses a fixed method. This hard rubber layer is formed at the tip of a rubber hose with a laminated structure of unvulcanized rubber and a reinforcing material such as a reinforcing fiber material or a reinforcing wire material and a reinforcing material such as a reinforcing fiber material. It is used for purposes such as placing fresh concrete, drainage, and suction. In other words, at the tips of the rubber hoses of various shapes, on the outer periphery of the ends of the required lengths, as appropriate, taking into consideration the balance between the structure and strength of the main body of the various shapes and the strength of the fitting insertion part. An unvulcanized hard rubber layer of the required length including reinforcing material is provided on the hose, and its outer diameter is approximately the same as the outer diameter of the rubber hose. It is vulcanized and bonded under vulcanization conditions to form a rubber hose having a hard rubber layer. This hard rubber layer can be strongly bonded to soft rubber, soft rubberized woven fabric, etc. by vulcanization adhesion on the inside depending on the structure of the rubber hose of various shapes, and the reinforcing wire material can be Since it is embedded in a spiral shape in a hard rubber layer, it is strongly bonded as one piece. Therefore, the required length of the hose tip becomes rigid and maintains a circular state without being easily deformed. Therefore, the diameter of the end of the hose does not change even if it comes into contact with an obstacle, is pressed, or is stepped on during fluid pumping or suction operations, so it does not interfere with the operation. Good suction and discharge operation is guaranteed. In addition, when sucking fluid in a narrow groove or discharging it into the groove, only the tip of the hose is rigid, so the hose can be smoothly inserted and removed without coming into contact with the groove wall. Since the circular shape of the tip is maintained, good suction and evacuation can be achieved. In addition, the above-mentioned hoses have a hard rubber layer vulcanized and bonded to the outer periphery of the end of the hose, and fittings can be easily and quickly attached with strong adhesive force as needed. , a hose with a cap fitting can be obtained very easily. That is, by bonding a fitting such as a pipe-shaped fitting or a flange fitting on a pipe-shaped fitting to the outside of a hard rubber layer using a high-hardness adhesive such as epoxy resin. , a rubber hose having a hard rubber layer to which a cap fitting is joined is obtained. In this case, the connection between the hose and the fitting is a pipe-shaped fitting with a slightly larger inner diameter, since the hard rubber layer on the outer circumference of the hose and the fitting are made of hard materials. It can be easily inserted, and unlike soft rubber, it does not easily deform and move under pressure, so it can be strongly bonded with a high-hardness adhesive. Therefore, it can be installed easily, quickly, and with strong adhesive strength on site. As an example of an adhesion test, the results of an adhesion test using vulcanization adhesion between hard rubber and soft rubber are as follows.
The value was 35 kg/2.5 cm in the 180° peel test method, and the adhesive strength of the epoxy resin adhesive between the hard rubber and the fitting was 150 kg/cm ² in terms of shear strength. [Function] As mentioned above, since the hose of the present invention has a hard rubber layer of the required length at the tip, the tip of the hose normally remains intact even if it is used without attaching a fitting. Maintains a uniform cylindrical shape without deformation. In addition, hoses with a hard rubber layer have low frictional resistance when inserted into fittings, and can be smoothly inserted into fittings, making it extremely easy to attach fittings, and in order to bond the hard materials together, a high-hardness adhesive can be used. It can be bonded to the hard rubber layer and the fitting, and can maintain a very strong adhesive force.
When pipe-shaped metal fittings are joined, the cylindrical shape is maintained without deformation even under strong external force. Furthermore, if a flange pipe fitting provided with a flange is set, it will be strongly connected at the site, and the hose connection will be easily performed. In addition, when joining the hard rubber layer and the lower layer, the rubber is primarily bonded to each other by vulcanization adhesion, and an extremely strong bonding force is obtained, so as a result, the cap fitting is firmly bonded to the rubber hose. It performs the function that the hose can provide. [Example] Next, an embodiment of a rubber hose having a hard rubber layer according to the present invention will be described in detail based on drawings. The drawing is a 1/2 sectional view of the end of a rubber hose having a hard rubber layer to which a fitting is joined, and shows an example in which a flange pipe is joined to the tip of the hose. In the figure, H is a rubber hose having a hard rubber layer, 1 is an inner rubber layer (soft rubber layer) of the hose,
2 is a reinforcing fiber material (this example is a rubberized nylon woven fabric),
3 is a reinforcing wire (steel wire with a pitch of 3 mm and 20 mm in this example), 4 is an intermediate rubber layer (soft rubber layer), and 5 is
is a reinforcing fiber material (this example is a rubberized nylon woven fabric),
6 is an outer covering rubber layer (soft rubber layer), 7 is a hard rubber layer, and in this example, the reinforcing wire 3 is embedded on the reinforcing fiber material 2, and the outer diameter is the same as that of the outer covering rubber layer 6. The length is selected as appropriate depending on the application, but is usually about 100 mm. 8 is a high-hardness adhesive, FP is a flange pipe, and a flange fitting 10 is connected to the end of a pipe fitting 9. A hard rubber layer is inserted into the inner diameter of the pipe fitting 9.
A slight allowance is provided so that the high hardness adhesive 8 can be used to bond the parts. The flange fittings 10 are connected to each other by using another fastening fitting or by providing bolt holes. In addition, the hard rubber layer and the soft rubber layer may be separated depending on whether the ends of the outer cover rubber layer adjacent to the hard rubber layer are reinforced with reinforcing cloth or the pipe fittings are slightly extended. It is preferable to take measures to prevent sudden changes in the hardness difference between the two. The structure of this hose H is as shown in the figure, in which an unvulcanized hose structure is formed on an iron core, formed by a tightening method, and placed in a vulcanization can by an open cure. It performs vulcanization. The hardness of the soft rubber layer used is usually about 60° using a JIS spring type hardness tester A type, and is generally 70° or less, and the hardness of the hard rubber layer is about 90° or less. More are used as appropriate. To join the fitting, before inserting the fitting into the vulcanized hose, clean the inner surface of the pipe fitting 9 at the insertion part and the outer surface of the hard rubber layer, and then use an epoxy resin adhesive (two-component type, epoxy Resin 100, hardening agent 10)
was applied to both sides to perform mating adhesion (the adhesive was
Commercially available products such as Konishi Bond 5-minute curing type can be used as appropriate). Next, the results of a pressure resistance comparison test between the rubber hose having a hard rubber layer with a spout according to the present invention and a conventional rubber hose are shown in the following table.

〔Effect of the invention〕

As mentioned in the function section, the hose of this invention has a hard rubber layer at the tip of the hose, so it can suck liquid in narrow grooves.
When discharging, the distal end of the hose is formed in a rigid state to perform suitable suction and discharge, and the distal end does not come into contact with the groove wall, making it easy to insert and remove the hose. Moreover, no matter how it is used depending on the situation at the site, the diameter of the tip will not be deformed and good discharge can be achieved. In addition, the cap fittings can be attached at any time with strong adhesive strength without using any equipment at any usage site, and after use as described above, the cap fittings can be attached as necessary. It can be used as a pressure-resistant hose by connecting it to the length of the hose at any time. In particular, the hose of this invention is easy to manufacture;
Not only is it easy to join the cap fittings on-site, but the bonding force is as strong as that of the vulcanized adhesive cap fitting method for ordinary bandless hoses, so it can be used under an extremely wide range of pressure. , which exhibits very effective industrial effects.

[Brief explanation of drawings]

The drawing is a 1/2 sectional view of a rubber hose having a hard rubber layer to which a cap fitting is joined, showing an example of the present invention. H...Rubber hose having a hard rubber layer, 2,
5...Reinforcement fiber material, 3...Reinforcement wire material, 7...Hard rubber layer, 8...High hardness adhesive, 9...Pipe shaped metal fitting, 10...Flanged metal fitting, FP...Flanged pipe.

Claims (1)

[Scope of Claims] 1. In various types of rubber hoses having a laminated structure of unvulcanized rubber, reinforcing fiber material, reinforcing wire material, reinforcing material such as reinforcing fiber material, etc. A rubber hose having a hard rubber layer, characterized in that a long hard rubber layer is integrally vulcanized and bonded with a soft rubber layer and/or a reinforcing material. 2. In various types of rubber hoses with a laminated structure of unvulcanized rubber, reinforcing fiber material or reinforcing wire material and reinforcing material such as reinforcing fiber material, a hard rubber layer and a soft rubber layer are applied to the outer periphery of the hose tip. A fitting such as a pipe-shaped fitting or a flange fitting attached to a pipe-shaped fitting is inserted outside a hard rubber layer of a required length that has been vulcanized and bonded together with a rubber layer and/or a reinforcing material. A rubber hose that has a hard rubber layer bonded to the outside of the rubber layer using a high-hardness adhesive such as epoxy resin.