JPS6010899B2 - Continuous hose manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for attaching a belt-shaped body of synthetic resin or unvulcanized rubber, a belt-shaped body of unvulcanized rubber having a synthetic resin as a core, and a metal wire as a core to a cantilever-supported former. Continuously manufacture the longest hose by spirally winding a band of synthetic resin or unvulcanized rubber material, forming it into a cylindrical body, and feeding this cylindrical body to the free end of the former. This invention relates to continuous hose manufacturing equipment.

When a hose is manufactured continuously by spirally winding strips as described above, applying heat during the forming process can prevent welding of the strips together, such as applying external pressure with a pressure roller during forming. This is preferable because it can be promoted without being restricted by the shape of the body itself, and when rubber material is used as the band-shaped body, the rubber can be vulcanized. There are the following problems:

[I] In other words, if we assume continuous molding of the hose, the former for forming the hose must be cantilevered, and the length of the former that can be cantilevered is determined mechanically. There is a limit.

‘.

) When using a poor conductor of heat such as rubber as a strip, if the hose wall is thick, or if there is a poor conductor of heat on the inside of a two-layered hose, heating may occur from the inside of the hose. Must. However, in order to heat the hose from the inside without being hindered by the former, it is generally possible to supply heated gas or heated steam, but the length of the hose during continuous forming is It is difficult in itself to supply heated gas or heated steam to only a part in the horizontal direction, and
Since the thermal conductivity of heated gas and heated steam is extremely low, a long heating process is required, and in order to perform heat treatment within the length range of the cantilevered former, the hose feed speed by the former must be extremely slow. This is difficult without the inefficient work of

It is also conceivable to install a heater instead of heated gas or heated steam to partially heat the material using fin radiation; Although it is possible to raise the temperature of the entire body relatively evenly by heating it with a heating element that has a temperature close to the predetermined temperature, this does not avoid the inefficient work mentioned above, and therefore the temperature is much higher than the predetermined temperature. This method requires the use of a temperature heating element, but this tends to cause uneven temperature rise of the material between parts far from and near the heating element installation point, and the molding process must be continued for a long time. There is a difference in the temperature of the heated air inside the hose between when the process continues and when the molding operation starts, and there is dust that causes unevenness in the degree of vulcanization during the molding process. The technical problem to be solved by the present invention is that a belt-like body of synthetic resin or unvulcanized rubber, a belt-like body of unvulcanized rubber having a core material of synthetic resin, etc. , by spirally winding a band of synthetic resin or unvulcanized rubber with metal wire as the core material and forming it into a cylindrical body, the cylindrical body is fed to the free end side of the former to form the longest cylindrical shape. In order to obtain an apparatus for continuously manufacturing a hose body, a forming apparatus, a heating apparatus, and a cooling apparatus are rationally combined so that the strip body can be subjected to heat treatment during the hose forming process. To provide an apparatus capable of manufacturing a hose without reducing work efficiency, with less occurrence of uneven heating, and with less heat loss during the entire hose manufacturing operation.

The technical means of the present invention taken to solve the above problems are as follows:
A feed roller consisting of a plurality of movable shaft bodies is mounted around the core metal through holding frames arranged at appropriate intervals in the longitudinal direction of the core metal with high thermal conductivity, which is cantilever-supported by a fixed frame.
The feed rollers are arranged in a spiral shape with a large pitch, and each of these feed rollers is attached so as to be able to rotate about its own axis in the stereotaxic calendar to form a former, and the belt-like body is placed on this former. The feed roller is configured to be rotationally driven so as to send out the cylindrical body formed by spiral winding to the free end side of the former, and further, the support portion side of the core bar is supported on a cantilever side. A heating mechanism is attached only to the closer portion, and the core metal portion on the free end side of the portion provided with the heating mechanism is configured as a core metal portion that is not equipped with a heating means for the core metal,
The cooling device is disposed in the upper layer of the former, which is further away from the position of the attached heating mechanism toward the free end.

The effects of taking the above technical measures are as follows.

■ A heating mechanism is attached to the cantilever side of the core metal, which is a part of the former component, and a part of the core metal is used as a heating element. Since the feed rollers lined up in the core rotate in a positioning layer in the axial direction of the core and contact the cylindrical body that becomes the hose, the heating temperature by the heating element can be adjusted to the temperature immediately after the heating element. Compared to the case where a cylindrical body is heated only by specular heat radiation, heating can be performed at a relatively low level and with less unevenness, and continuous molding work can be performed efficiently.

In other words, the feed roller is located closer to the core metal than the hose, and since this core metal is a heat generating element, the outer peripheral surface of the feed roller on the side closer to the core metal is closer to the heat generating element than the cylindrical body. While the Korean radiation heat is efficiently transmitted at the position, the heat is
Heat is transferred to the cylindrical body from the outer peripheral surface of the feed roller, which is in direct contact with the cylindrical body, as conductive heat, so the heat of the heating element is transferred to the surface of the feed roller, which has a much higher thermal conductivity than air or steam. It is possible to transmit it to the cylindrical body quickly and efficiently. Therefore, compared to the case where the cylindrical body is directly heated only by the radiation heat of the heating element, efficient molding is possible even if the temperature of the heating element is relatively low, which is effective in reducing heating unevenness. It is possible to continue working. 2 Heat transfer is carried out efficiently as described above, and
Since heating is performed at a point where the temperature has been raised to a certain high temperature for molding and has not yet been cooled, it goes without saying that there is little thermal loss in this respect.
Moreover, as a former for forming, the feed roller rotates on its own axis in the positioning layer to feed the cylindrical body, and the position of the feed roller does not move in the length direction of the hose and escape from the heating area. Since the feed roller continues heating while maintaining a fixed position in the direction of the core metal axis, for example, a steel belt is wound around the outer circumferential surface of a winding drum as a forming device, and this steel belt is moved in a spiral direction. Compared to a system that heats a cylindrical body that becomes a hose while heating, there is no thermal loss such as the steel belt being cooled by a cooling device or being cooled by moving outside the heating area, and the overall thermal efficiency is extremely low. An apparatus capable of manufacturing hoses with little loss has been obtained.

Furthermore, since the cylindrical body that becomes the hose is hardened by being cooled on the former, which is a portion of the former that is not equipped with a heating mechanism, the cylindrical body is The shape is maintained correctly until it solidifies, so there is no need to apply external pressure from the outside of the cylindrical body using a compaction roller, etc., and hoses with the desired shape can be manufactured continuously. It is. In particular, when constructing a cylindrical body using a rubber strip with a thermoplastic resin core embedded inside its thickness, it is necessary to Sulfurized rubber can be subjected to heat vulcanization treatment to improve shape retention during the molding process, and the resin core material, which softens when heated, is prevented from deformation by a rubber material with good retention properties, and is brought into the cooling process. This is useful in that the hose can be manufactured as desired by keeping the overall shape as desired until the material hardens and becomes difficult to deform. For the reasons described above, a manufacturing apparatus capable of continuously molding long hoses with high thermal efficiency and accuracy can be obtained.

Embodiments of the present invention will be described below based on the drawings.

First, a manufacturing apparatus for manufacturing a rubber hose in which a resin reinforcing material is embedded will be described as an example. A shown in Fig. 1 is a continuous extrusion molding of a strip 3 in which a reinforcing material 2 made of hard vinyl chloride, which is a thermoplastic resin, is embedded within the thickness of unvulcanized rubber mixed with a vulcanizing agent. This is an extrusion molding machine that feeds it onto Farmer B, which is supported on a cantilever.

Inside extrusion molding machine A, the vulcanized rubber is approximately 60q0
Below, the reinforcing material 2 is kept at about 130-180 qo, and the strip 3 extruded from die a into the atmosphere is about 100 qo.
It is set to be kept at . The unvulcanized rubber 1 is made of a material that has good compatibility with hard vinyl chloride, and when it is formed into the strip 3, the unvulcanized rubber has properties that are better than those at room temperature due to heating due to extrusion molding. As the physical properties change to become more aggressive, the unvulcanized rubber and the reinforcing material 2 melt and adhere to each other at the interface. A heating device 5B is installed inside the outer periphery of the intermediate portion in the longitudinal direction of the former B, and a vulcanizing device 6 is constituted by these heating devices 5A and 5B. While being subjected to a feeding action and being kept in shape by former B,
Approximately 170 to 2
It is heated at 20:00 and is continuously vulcanized.

The heating devices 5A and 5B are not installed on the free end side of the former B that protrudes beyond the vulcanizing device 6, and the heating devices 5A and 5B are installed as a cooling device on the outer periphery of the former B in the protruding portion. The hose-like body 4 after vulcanization is immediately cooled by the cooling water jetted from the cooling water spouting nozzle 7, and then cooled to room temperature while floating on the long water tank 8. The reinforcing wire 2 is cured to form a reinforced rubber hose as shown in FIG. Incidentally, when the above-mentioned method was carried out using the following materials, the rubber la and the reinforcing wire 2 were attached. Former B was formed into a cylindrical body by spirally winding the band-shaped body 3 so that its side edges overlapped each other inside and out. 4, the cylindrical body 4 is sent out to the free end side of the former B.

Former B is equipped with a heating mechanism, and a heating chamber 5 is formed on the outer periphery of the intermediate portion in the longitudinal direction of Former B, which is equipped with a heating mechanism C2 that uses an infrared lamp. The cylindrical body 4 that is being fed while being
000 and undergo continuous vulcanization treatment. The heating mechanism C is not installed on the free end side of the former B that protrudes beyond the heating chamber 5, and a cooling water jet nozzle 6 as a cooling device is disposed near the outer periphery thereof. 7 is a long aquarium.

Therefore, the cylindrical body 4 after heating and vulcanization is cooled by the cooling water from the nozzle 6, and further cooled to room temperature while floating on the long water tank 7, and the reinforcing material 2 is hardened. 6
As illustrated in the figure, a helical reinforcing material 2 is manufactured into a reinforced rubber hose embedded within the thickness of the rubber layer la.

Note that the cross-sectional shapes of the reinforcing material 2 and the vulcanized rubber 1 can be appropriately set by setting the shape of the die a.

In addition, the end of the cylindrical body 4 is closed with a suitable cap at the time it comes off the free end of the former B to prevent water from entering inside when floating on the long water tank 7. shall be configured. The specific structure of Former B is as follows.

That is, as shown in FIGS. 2 to 4, one end of the core metal 8 having high thermal conductivity is fixedly supported in a cantilevered state by inserting a sleeve screwed into the frame 9 into the frame 9. A plurality of feed rollers 11 formed of a thermally conductive movable shaft body are disposed on the outer circumferential surface of the This is a well-known fact.

), and a plurality of conductive holding frames 12 arranged at appropriate intervals along the longitudinal direction of the feed roller 11.
(It is a well-known fact that this holding frame is made of metal and has thermal conductivity.) The rollers 11, . The holding frame 12・
・ has a polygonal shape as shown in FIG. It is fixed on the core bar 8 by tightening the core bar 8, and by shifting the phase of each holding frame 12 by a fixed angle 8 from the cantilever side end of the core bar 8 to the free end and fixing it, the feed can be adjusted. The helical pitch of the rollers 1 1... can be freely set.

The base end of each feed roller 11... is interlocked and connected to one end of a passive shaft 15... which is rotatably inserted and supported by the frame 9 via a coupling 16, and is connected to the end of the passive shaft 15... A pinion gear 19 is fixed to the gear 18 fixed to the drive shaft 17, and the drive shaft 17 rotates in one direction by the input from the pulley 20, so that each feed roller 11... It is configured to rotate in the opposite direction to the spiral direction.

As shown in FIGS. 4 and 5, the heating mechanism C of the former B has a plurality of holes drilled at equal intervals in the core metal 8, and each hole is filled with an electrically insulating material. It is constructed by inserting a coated nichrome wire heater 21.

According to the above configuration, the cylindrical body 4 on the former B is simultaneously heated from both the inside and outside sides by both heating mechanisms and C2, so that the shape of the cylindrical body 4 is maintained so that it does not collapse unexpectedly. , the entire cylindrical body 4 is uniformly and efficiently heated and vulcanized.

In particular, the internal heating mechanism C is inserted into the core metal 8 having good thermal conductivity, and is in contact with the inner circumferential surface of the cylindrical body 4 via the feed rollers 11. Therefore, the heating efficiency is extremely high, and therefore the vulcanization process can be performed extremely efficiently.

In addition, the reinforced rubber hose manufactured by the above-mentioned manufacturing apparatus not only has excellent oil resistance and heat resistance, but also has the reinforcing material 2 and the rubber layer la uniformly and strongly over the entire circumference of the reinforcing material 2. Since they are bonded together, both 2 and la will not easily separate due to repeated bending deformation, and the reinforcing effect of the reinforcing material 2 will be reliably exerted over a long period of time.

In addition to the structure described in the above embodiment, the heating mechanism C has a core bar 8.
A structure in which a nichrome wire heater 21 is attached to the outer peripheral surface of the former B, and a structure in which an oil passage is bored in the core metal 8 and high temperature oil heated outside the former B is circulated and supplied through this oil passage. , and various other specific structures can be adopted, and the structure is not limited to the illustrated structure.

Furthermore, no matter which type of heating mechanism C is employed, the external heating mechanism C2 may not be necessary depending on the structure, material, etc. of the hose to be manufactured.

For example, as shown in FIG. 7A, in the case of a flexible hose that has a rubber layer la only on the inner surface and a soft resin layer 22 such as European vinyl chloride on the outside, an extrusion molding machine A is used to make the soft resin. A belt-shaped body with unvulcanized rubber melted and adhered to the entire width of the lower surface is continuously extruded, and this belt-shaped body is spirally wound onto former B to form a cylindrical body. , so that heat can be applied to this cylindrical body from the inside and continuously heated. According to this, the rubber layer la can be efficiently vulcanized while suppressing the adverse effects of heat on the soft resin layer 22 as much as possible. The hose shown in Figure 7 is the same as the one in Figure 7 A, except that a reinforcing material 2 made of hard vinyl chloride (metal wire may also be used) is embedded inside the soft resin layer 22. The rubber layer la is vulcanized from the inside by a heating mechanism C in the former B.

Figure 8 shows the outer circumference of the cylindrical body formed from the rubber layer la.
This hose is reinforced with a spiral hard resin reinforcing material 2.

This hose is made by continuously extruding a band-shaped body in which reinforcing material 2 is melt-touched to the center of the upper surface of unvulcanized rubber using extrusion molding machine A. The heating mechanism C in the former B is wound spirally onto the former B so as to be overlapped with each other to form a cylindrical body.
It is manufactured by heating and vulcanizing from the inside. FIG. 9 shows a heat insulating hose in which a foamed resin layer 25 in which a reinforcing material 2 is embedded is formed between two resin layers 23 and 24, an inner and outer layer, and a band-shaped body forming each layer 23, 24, 25. While spirally winding on former B to form a cylindrical body,
The foaming process is performed by heating from the inside using the heating mechanism C in the foamer B.

Note that this may be carried out without embedding the reinforcing material 2.

In addition, although not shown in the drawings, if a heating mechanism is also provided in the forming process part near the cantilever support point in the former B, and the cylindrical body being formed on the former B is heat-treated from the inside, multiple strips can be formed. When manufacturing a multilayered hose made of spirally wound materials, it is possible to promote melting and adhesion between the layers by reheating on the former.

[Brief explanation of the drawing]

The drawings show an embodiment of the continuous hose manufacturing apparatus according to the present invention, in which FIG. 1 is a schematic front view showing the manufacturing process of a reinforced rubber hose, FIG. 2 is a plan view, FIG. 3 is a front view, and FIG. 4 is a main view. Fig. 5A is a longitudinal sectional front view of the section, Fig. 6 is a cutaway front view of the - section of the reinforced rubber hose, Fig. 7A is the opening, Fig. 8
9 are vertical sectional front views of main parts showing different product hoses. 3... Band-shaped body, 4... Cylindrical body, 6... Cooling device, 8... Core bar, 11... Feed low-fu, 12... Holding frame, B...Former, C,...Heating mechanism. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] 1. A plurality of flexible shaft bodies are attached around the core metal 8 through holding frames 12 arranged at appropriate intervals in the longitudinal direction of the core metal 8 with high thermal conductivity, which is cantilever-supported on a fixed frame. The feed rollers 11... are disposed in a spiral shape with a large pitch, and each of the feed rollers 11... is mounted so that it can rotate about its own axis in a fixed position. B, and is configured to rotationally drive the feed roller 11 so as to send out the cylindrical body 4 formed by spirally winding the band 3 onto the former B to the free end side of the former B, moreover,
A heating mechanism C_1 is attached only to a portion of the core bar 8 that is cantilevered and closer to the support portion, and
A portion of the core metal 8 closer to the free end than the portion where the heating mechanism C_1 is provided is configured as a core metal portion that is not provided with heating means for the core metal 8, and the free end is closer to the position of the attached heating mechanism C_1. This is a continuous hose manufacturing device in which a cooling device 6 is disposed above a former B that is separated from the side.