JPH0449012A - Vulcanizing method of rubber hose - Google Patents

Abstract

PURPOSE:To suppress the difference of the degrees of vulcanizaion of inner and outer surfaces largely, and to vulcanize a rubber hose having excellent quality efficiently by introducing a heating medium into a mandrel and vulcanizing the rubber hose while heating the rubber hose from the inside. CONSTITUTION:An unvulcanized rubber hose 24 is installed on the outer circumferential surface of a mandrel 22, the mandrel is loaded on a truck 20 on the outside of a vulcanizer 10, and manifolds 52, 54 are connected at both ends of the mandrel 22. The truck 20 is pushed into the vulcanizer 10, and a supply pipe 60 and an exhaust pipe 62 are connected to the connecting holes 82 of the corresponding manifolds 52, 54. The inside of the vulcanizer 10 is supplied with steam through a steam blow-off pipe 28 while steam is fed into the mandrel 22 through the supply pipe 60, the manifold 52, a steam supply pipe 38, a steam exhaust pipe 40, the manifold 54 and an exhaust pipe 62. The unvulcanized rubber hose 24 is heated efficiently from the inside and the outside, and the unvulcanized rubber hose 24 is vulcanized efficiently in a short time without causing significant difference of the degrees of vulcanization between outer and inner surfaces.

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a method for vulcanizing comb hose.

(Prior Art) Rubber hoses are usually vulcanized by coating an unvulcanized rubber hose 100 on the outer peripheral surface of a mandrel 102, as shown in FIG.
This is inserted into the vulcanizing can 104, and the vulcanizing can 104
This is done by introducing a heating medium, generally black air, into the interior. In the figure, reference numeral 106 denotes a cart for loading and unloading the mandrel 102 covered with the rubber hose 100 into and out of the vulcanizing can 104.

(Problem to be solved by the invention) In this case, although the outer surface of the rubber hose lOO is effectively heated by contact with steam, the inner surface of the rubber hose 100 is heated by the mandrel 102 and the com hose 10.
0 is only heated. Therefore, the inner surface of the rubber hose 100 is not heated as effectively as the outer surface, and therefore the degree of vulcanization on the inner surface of the rubber hose 100 is lower than that on the outer surface, and the physical properties of the rubber on the inner surface of the rubber hose 100 are lower than those on the outer surface. There was a problem that the performance was significantly inferior.

Further, in this case, since the heating efficiency for the inner surface of the rubber hose lOO was low, there was also a problem that the vulcanization time was inevitably long.

Means for Solving Problem 1) The present invention has been made to solve such ays, and its gist is that the mandrel is covered with an unvulcanized rubber hose on the outer circumferential surface of the mandrel. The purpose is to introduce a heating medium into the inside and vulcanize the unvulcanized rubber hose while vigorously heating it from the inside.

(Function and Effects of the Invention) In this way, the inner surface of the unvulcanized rubber hose is efficiently heated by the heating medium introduced into the mandrel. Therefore, by combining the method of heating an unvulcanized rubber hose from the outside using a vulcanizing can, for example, the difference in the degree of vulcanization between the inside and outside can be greatly suppressed or eliminated, and a high-quality rubber hose can be produced in a short period of time. It becomes possible to vulcanize in a timely and efficient manner.

Incidentally, by using it in conjunction with the conventional method of heating an unvulcanized rubber hose from the outside using a vulcanizing can, it is possible to
The vulcanization time for rubber hoses, which used to take 0 minutes, is now half that time.
It has been recognized that the time can be reduced to about 0 minutes, and it has also been recognized that the rubber physical properties such as hardness, elongation, and tensile strength of the inner surface of the rubber hose can be improved by nearly 20 to 30% compared to conventional ones.

According to the method of the present invention, it is possible to vulcanize an unvulcanized rubber hose using a heating medium introduced into a mandrel.

In this case, the vulcanizer can be used without using a vulcanizing can, so the vulcanizing equipment becomes simple and compact, and since there is no need to put the mandrel in and out of the vulcanizing can, the work efficiency of the vulcanizing work is improved, and the rubber hose The manufacturing cost will be low. Further, in this case, since it is only necessary to introduce the heating medium into the mandrel, which has a small volume and heat capacity, it is possible to improve the thermal efficiency and downsize the 7JO heating medium supply device. When vulcanization is performed without using a vulcanizing can, the length of the mandrel and, by extension, the length of the rubber hose to be vulcanized is not limited by the vulcanizing can.

(Example) Next, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 shows an example of a vulcanizing apparatus for vulcanizing unvulcanized rubber hose according to the method of the present invention. Reference numeral 10 denotes a vulcanized can, including a longitudinally cylindrical can body 14 that is closed at one end in the axial direction by a wall 12;
and a lid body 16 that releasably closes the opening of.

As shown in FIGS. 1 and 3, inside this vulcanizing can 10, a pair of rails 18 are provided so as to extend in the longitudinal direction of the vulcanizing can IO, and a trolley is mounted on these rails 18. The trolley 20 on which the mandrel 22 and the unvulcanized rubber hose 24 coated on the outer surface of the mandrel 20 are carried into the vulcanizing can 10 , and the vulcanizing can 10 is moved by shifting the wheels 26 . It is designed to move in the longitudinal direction.

When the opening of the can body 14 is opened as shown in FIG. 2, the cart 20 can be moved into and out of the vulcanizing can 10 through the opening.

Also, inside the can 10, as shown in FIG.
A steam blow-off pipe 28 is arranged over substantially the entire length thereof. A plurality of steam introduction pipes 30 are connected to this steam blow-off pipe 28 and are arranged through the can body 14 of the vulcanizing can 10, and the steam led through these steam introduction pipes 30 is The water is blown out substantially evenly into the vulcanizing can 10 from the multiple outlets of the pipe 28.

Mandrel 22 covered with the unvulcanized rubber hose 24
As shown in FIG. 4, it has a hollow cylindrical structure, and has female screw holes 34 and 36 at both ends in the axial direction. As shown in FIG. 1, a steam supply pipe 38 is connected to the female threaded hole 34 side of the mandrel 22, and a steam exhaust pipe 40 is connected to the female threaded hole 36 side. . In this example, this allows steam to flow to the mandrel 22 through the steam supply pipe 38 and the steam discharge pipe 40.

In this example, the steam supply pipe 38 is directly connected to the female threaded hole 34, but the steam exhaust pipe 40 is connected to a connecting sleeve 44 (FIG. 4) with a conduit 42 in order to discharge the train accumulated in the mandrel 22. indirectly through the female screw hole 36
It is designed to be connected to.

Specifically, as shown in Figure 4, mandrel 2
A connecting sleeve 44 is hermetically screwed onto one end of the female screw hole 36 of No. 2, and a female screw hole 46 for connecting the steam exhaust pipe 40 is provided at the other end of the connecting sleeve 44. And the mandrel 22 of this connecting sleeve 44
A conduit 42 is secured at one end to the side opening;
In this example, the opening on the other end side of the conduit 42 is opened near the lower end of the inner circumferential surface of the mandrel 22.
The drain 48 generated within the mandrel 22 is discharged to the outside of the mandrel 22 through the conduit 42 by a siphon effect based on the pressure difference between the inside and outside of the mandrel 22, more precisely by a siphon effect based on the pressure difference between both ends of the conduit 42. It has become so.

Further, in this example, flexible hoses are used for the steam supply pipe 38 and the steam discharge pipe 40.

A steam supply pipe 38 and a steam discharge pipe 40 connected to both shaft ends of the mandrel 22 are connected to a steam supply manifold 52 disposed on the car body 50 of the truck 20, respectively, as shown in FIG. and a manifold 54 for steam exhaust. These manifolds 52.5
4 are provided at opposite ends of the vehicle body 50 in the longitudinal direction, as is clear from FIG. Further, each manifold 52, 54 is divided and arranged at both ends of the vehicle body 50 in the width direction, as shown in FIGS. 2 and 3. And these manifolds 52.
54 and the same number of connection ports 56 (here 811)
．． 58 are provided, and a steam supply pipe 38 and a steam exhaust pipe 40 connected to said mandrel 22 are connected to these connection ports 56,58, respectively.

Each manifold 52 is divided in the width direction of the vehicle body 50.
54 are connected to each other by connecting pipes (not shown).

Steam supply to manifold 52 and manifold 54
As shown in FIG. 1, the steam is discharged through a supply pipe 60 and a discharge pipe 62 which are disposed airtightly passing through the can body 14 of the vulcanizing can 10.

These supply pipes 60 and discharge pipes 62 are shown in FIGS.
As shown in the figure, when the carriage 20 is moved to the desired rubber hose vulcanization position in the vulcanization can 10, the manifolds 52 and 54 are provided so as to face each other. The supply pipe 60 and the discharge pipe 62 are normally retracted to a retracted position where they do not interfere with the cart 20, but when the unvulcanized rubber horn 24 is vulcanized, they are moved inside the vulcanization can 10 from the retracted position. It is made to protrude and is adapted to be connected to each manifold F'52 and 54, respectively.

That is, as shown in detail in FIG. 3, a cylindrical holder 6 is provided in the can body 14 of the vulcanizing can 10 so as to face the hole F52 (54) of the cart 20 that has been moved to the vulcanizing position.
4 are provided. This cylindrical holder 64 is the vulcanizing can 1
The guide bush 66 is airtightly fitted to the inner surface of the guide bush 66. The supply pipe 60 (discharge pipe 62) is airtightly and slidably connected to the inner surface of this guide bushing 66 via a sliding bush 68! ! y can be fitted together.

The base end (end on the outer side of the vulcanizing can lO) of the supply pipe 60 (discharge pipe 62) is connected to the tip of the bisto knot 74 of the cylinder 72. Further, the cylinder 72 is fixed to the cylindrical holder 64 via the bracket 70. The supply pipe 60 (discharge pipe 62) is thereby connected to the cylinder 7.
2, it can be moved back and forth in the axial direction.

Here, the through hole 76 in the supply pipe 60 (discharge pipe 62) is formed such that one end thereof is opened toward the distal end surface, and the other end thereof is opened toward the side of the proximal end portion. In this example, as is clear from FIG. 2, a connecting pipe 78 is connected to the proximal opening of the through hole 76, and a flexible hose 79 is connected to this connecting pipe 78, and further to the connecting pipe 78. Through this, steam is supplied to the supply pipe 60, or steam is discharged from the discharge pipe 62. The connecting pipe 78 is connected to the bracket 70 so as not to obstruct the reciprocating movement of the supply pipe 60 (discharge pipe 62).
It is arranged so as to pass through an elongated length 80 formed in the .

On the other hand, on the manifold 52 (54) side of the first truck 20, as shown in FIG.
2 is provided. Then, when the supply pipe 60 (discharge pipe 62) is pushed out by the cylinder 72 while the cart 20 has moved to the vulcanization position, its tip abuts the connection hole 82 of the manifold 52 (54), and the supply pipe 60 ( A through hole 76 of the discharge pipe 62) is connected to the inner hole of the second hold 52 (54).

Note that here, the supply pipe 60 (discharge pipe 62) is connected to the manifold 5.
2 (54), tapered surfaces that can be fitted to each other are formed on the outer peripheral surface of the distal end of the supply pipe 60 (discharge pipe 62) and the opening edge of the connecting hole 82. Although not shown, a seal ring made of a heat-resistant material such as Teflon is disposed on one of these tapered surfaces.

Next, a procedure for vulcanizing the unvulcanized rubber hose 24 using such a vulcanizing device will be explained.

First, the unvulcanized rubber hose 24 to be vulcanized is placed on the mandrel 22.
Then, the outer surface of the unvulcanized rubber hose 24 is restrained by wrapping tape or the like.Then, the mandrel 22 covered with the unvulcanized rubber hose 24 is placed on a trolley outside the vulcanizing can 10. 20 and those mandrels 2
Manifolds 52 and 54 are connected to both ends of 2 via a steam supply pipe 38 and a steam discharge pipe 40.

In this case, in this example, as described above, the manifold 52.
54 are each provided with 8@ connection boats 56.58, so that a maximum of eight mandrels 22 can be connected to the manifolds 52, 54.

Further, in this case, the opening of the drain discharge conduit 42 is positioned on the lower end side of the inner peripheral surface of the mandrel 22. This positioning can be easily performed, for example, by providing a mark or the like on the connecting sleeve 44 to indicate the opening position of the conduit 42.

When the mandrel 22 is set on the trolley 20, the connecting holes 82 of the manifolds 52 and 54 are connected to the supply pipe 60 and the discharge pipe 62.
In this case, it is preferable that the moving position ff1 (vulcanization position) of the cart 20 be defined by a mechanical stopper mechanism.

When the truck 20 is moved to the vulcanization position, the cylinder 72 causes the supply pipe 60 and the discharge pipe 62 to protrude from their respective retracted positions and are connected to the connection holes 82 of the corresponding manifolds 52 and 54. Further, the opening of the can body 14 of the vulcanizing can 10 is closed with the lid 16. While supplying steam into the vulcanizer 10 through the steam blow-off pipe 28, the supply pipe 60. Manifold F' 52, ji air supply pipe 38. Steam exhaust pipe 40, manifold 54. Steam is passed through the mandrel 22 through the exhaust pipe 62.

In this way, the unvulcanized rubber hose 24 covered on the outer peripheral surface of each mandrel 22 is efficiently heated from the inside and outside by the steam flowing through the mandrel 22 and the steam introduced into the vulcanizing can 10. It is.

Therefore, the unvulcanized rubber pose 24 can be cured with high effectiveness in a short time without a large difference in degree of vulcanization between the inner and outer surfaces! be done. In the second case, the pressure and temperature of the steam flowing into the mandrel 22 can be adjusted independently of the steam introduced into the vulcanizing can 10, depending on the type 1 of the rubber pouf.

When the scheduled vulcanization time has elapsed and the unvulcanized rubber hose 24 is vulcanized, the introduction of steam into the vulcanizer 10 and the flow of steam to the mandrel 22 are stopped. Then, the supply pipe 60 and the discharge pipe 62 are retreated by the cylinder 72 to separate them from the hole '52.54, and
The lid 16 of the vulcanizing can IO is opened and the cart 2o is pulled out of the vulcanizing can io, thereby completing a series of vulcanizing operations.

Although the embodiments of the present invention have been described in detail above, the present invention may be implemented in other embodiments.

For example, in one example, a mandrel 22 covered with an unvulcanized rubber hose 24 is inserted into the vulcanizing can 10, and at the same time as steam flows into the mandrel 22, the outer surface of the manotrel 22 is also brought into contact with the unvulcanized rubber hose 24. The sulfur rubber hose 24 was heated from its inner and outer surfaces, but without inserting the mandrel 22 into a vulcanizing can or the like, steam was passed only inside the mandrel 22 and the outer peripheral surface of the mandrel 22 was heated. It is also possible to heat and vulcanize only #Mllll of the unvulcanized rubber hose 24 covered with the rubber hose.

In this case, there is no need to use a large and expensive vulcanizing can, so the vulcanizing equipment becomes simple and compact, and there is no need to take the mandrel into and out of the vulcanizing can. The efficiency of vulcanization work is improved and the manufacturing cost of rubber hoses is reduced. In addition, in this case, steam only needs to be introduced into the mandrel, which has a small volume and heat capacity, and the thermal efficiency is greatly improved. Furthermore, since the length of the rubber hose is not limited by the vulcanization can, it is possible to advantageously manufacture a long rubber hose.

Furthermore, although the present invention is particularly applicable to the vulcanization of large diameter rubber hoses with an inner diameter of about 40 layers or more, it can also be applied to the vulcanization of small diameter rubber hoses with an inner diameter of about 40 cm or less. I can do it.

This open water invention has various modifications based on the knowledge of those skilled in the art without departing from the spirit thereof, such as the possibility of adopting heating media other than those described above as the heating medium introduced into the mandrel. It can be carried out in

[Brief explanation of the drawing]

FIG. 1 is an explanatory view showing an example of a vulcanizing device suitable for carrying out the present invention, FIG. FIG. 4 is an enlarged cross-sectional view of a main part of the vulcanizing apparatus, and FIG. 4 is a cross-sectional view showing the structure of a mandrel in the vulcanizing apparatus. FIG. 5 is an explanatory diagram for explaining a conventional example. 10: Vulcanized can 20: Cart 22: Mandrel 24: Unvulcanized steel, *-3
8: Steam supply pipe 40: Steam discharge pipe 52.54: Manifold 60 Supply pipe 62/discharge pipe Fig. 5

Claims (1)

[Claims] A method for vulcanizing a rubber hose, which comprises introducing a heating medium into the interior of the mandrel in a state in which the unvulcanized rubber hose is covered on the outer peripheral surface of the mandrel, and vulcanizing the unvulcanized rubber hose while heating it from the inside. .