JPH0452107A - Method and equipment for vulcanizing rubber hose - Google Patents

Abstract

PURPOSE:To eliminate difference in the degree of vulcanization in the internal and external faces and to drastically shorten a vulcanization time by introducing a heating medium into a mandrel and heating an unvulcanized rubber hose from both the internal and external faces. CONSTITUTION:An unvulcanized rubber hose 24 is fitted to the external circum ferential face of a mandrel 22. Manifolds 52, 54 are connected with both axial ends of the mandrel 22 via a supply pipe 38 and a discharge pipe 40 of steam. A dolly 20 is introduced into a vulcanization can 10 to the position wherein the joint holes 82 of manifolds 52, 54 are opposed to a supply pipe 60 and a discharge pipe 62. The supply pipe 60 and the discharge pipe 62 are projected from the respective evacuation positions by a cylinder 72 and joined to the joint holes 82 of the respective correspondent manifolds 52, 54. After the aper ture of a can main body 14 is closed, steam is supplied into the vulcanization can 10 through the blowout pipe 28 of steam. On the other hand, steam is passed into the mandrel 22 through the supply pipe 60, the manifold 52, the supply pipe 38 and the discharge pipe 40 of steam, the manifold 54 and the discharge pipe 62.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of vulcanizing a rubber hose and a vulcanizing device suitable for use therein.

(Prior art) Generally, as shown in FIG. 5, vulcanization of a rubber hose is carried out by coating an unvulcanized rubber hose lOO on the outer peripheral surface of a mandrel 102, inserting it into a vulcanizing can 104, and performing vulcanization. can 10
This is done by introducing a heating medium, generally steam, into the heating chamber. In addition, 106 in the figure is a trolley, and the mandrel 102
and an unvulcanized rubber hose 100 coated on its outer circumferential surface are mounted and carried 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 100 is effectively heated by contact with steam, the inner surface of the rubber hose 100 is heated by the mandrel 102 and the rubber hose 10.
It is only heated by the heat conduction effect of 0 itself. Therefore, the inner surface of the rubber hose 100 is not heated as effectively as the outer surface, and as a result, 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 100 is low, there is also a problem that the vulcanization time is inevitably long.

(Means for Solving the Problems) The present invention has been made to solve the above problems, and its gist is to vulcanize an internally hollow mandrel whose outer peripheral surface is covered with an unvulcanized rubber hose. The unvulcanized rubber hose is inserted into the can and a heating medium is introduced into the mandrel to heat the unvulcanized rubber hose together with the heating medium in the vulcanizing can from both the inside and outside.

(Operation and Effects of the Invention) In this way, the unvulcanized rubber hose can be efficiently heated from both its inner and outer surfaces, so that the difference in degree of vulcanization between the inner and outer surfaces can be significantly suppressed or eliminated, and the vulcanization can be improved. The time required for this can also be significantly reduced. Furthermore, according to the method of the present invention, the pressure and temperature of the heating medium introduced into the mandrel can be controlled independently of the heating medium introduced into the vulcanization can, so the vulcanization conditions can be adjusted depending on the type of rubber hose, etc. Another advantage is that it can be easily optimized.

Incidentally, it has been confirmed that the vulcanization of the rubber hose, which took 60 minutes using the conventional method, can be reduced to approximately 30 minutes by using the method of the present invention. Rubber physical properties such as strength are also about 20-30%
It is recognized that the degree of improvement can be improved.

In order to carry out the method of the present invention, (a) a vulcanizing can, and (c)
I) an internally hollow mandrel; (c) a truck for carrying the mandrel and the unvulcanized rubber hose covered on its outer circumferential surface into the vulcanization can; and (d) a pipe connection provided on the truck. a first supply pipe and a first discharge pipe whose one end side is connected to the pipe connecting part and extends from the truck, and whose other end side is connected to the shaft end of the mandrel on the truck; (f) It is possible to use a vulcanizing device having a second supply pipe and a second discharge pipe which are provided to airtightly penetrate the vulcanizing can and whose tips are connected to the pipe connecting part of the truck.

In addition, in this vulcanizing device, if the second supply pipe and the second discharge pipe are configured to be able to go in and out, and the second supply pipe and the second discharge pipe are moved forward and backward by a driving means, the mandrel and the hose are vulcanized. It is possible to prevent them from becoming a hindrance when carrying them into or out of the can (by retracting the container pipe), and also to connect the second supply pipe and second discharge pipe to the pipe communication part. It is convenient because it can be automated.

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

FIG. 1 shows an example of a vulcanization apparatus according to the method of the present invention. Here, 1O is a vulcanized can, and includes a longitudinally cylindrical can body 14 whose one end in the axial direction is closed with a wall 12;
A lid body 16 that releasably closes the opening of the can body 14.
It consists of.

As shown in FIGS. 1 and 3, a pair of rails 18 are provided in the vulcanizing can 10 so as to extend in the longitudinal direction of the vulcanizing can 10. A trolley 20 is mounted.

The trolley 20 carries a mandrel 22 and an unvulcanized rubber hose 24 (generally with an inner diameter of about 40 mm or more) coated on the outer circumferential surface of the mandrel 22 into the vulcanizing can 10, and also vulcanizes them after vulcanization. It is for carrying out from the sulfur canister 10, and is moved on rails 18 by shifting wheels 26. When the opening of the can body 14 is open 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 vulcanizing can 10, as shown in FIG.
A direct air blowing W 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 liquid is blown out almost evenly into the vulcanizing can 10 from a large number of 28 blow-off ports.

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 $ air supply pipe (first supply pipe) 38 is connected to the female threaded hole 34 side of the mantle 22, and a gas supply pipe (first supply pipe) 38 is connected to the female threaded hole 36 side. A steam exhaust pipe (first exhaust pipe) 40 is connected. In this example, this allows steam to flow into the mandrel 22 through the steam supply pipe 38 and the steam exhaust 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 (see FIG. ) indirectly through the female screw hole 3
6.

Specifically, as shown in Figure 4, mandrel 2
A connecting sleeve 44 is airtightly screwed onto one end of the female threaded hole 36 of No. 2, and an R
A female threaded hole 46 is provided for connecting a heat exhaust v40. Here, a conduit 42 is fixed at one end to the opening of the connecting sleeve 44 on the mandrel 22 side, and the other end of the conduit 42 is opened near the lower end of the inner peripheral surface of the mandrel 22.

In this example, this means that the train 48 generated within the mantle 22 is caused by a siphon effect based on the pressure difference between the inside and outside of the mantle 22, or more precisely, due to a siphon action based on the pressure difference between the two ends of the conduit 42. It is adapted to be discharged to the outside of the mandrel 22 through a conduit 42.

Further, in this example, flexible hoses are used for the steam supply v38 and the steam exhaust 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
Reference numeral 4 functions as a pipe connecting portion, and as shown in FIG. 1, it is provided at opposite ends of the vehicle body 50 in the longitudinal direction. These manifolds 52 and 54 are connected to the vehicle body 5, as shown in FIGS. 2 and 3.
They are divided and arranged at both ends of 0 in the width direction.

And these manifolds 52 and 54 have the same number (
Here, eight connection boats 56.58 are provided, and the steam supply pipe 38 and steam discharge pipe 40 connected to the mandrel 22 are connected to these connection ports 56.58, respectively.

Each manifold 5 is divided and arranged in the width direction of the vehicle body 50.
2.54 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 from a supply pipe (second supply pipe) 60 and a discharge pipe (second drain pipe) 62.

These supply pipes 60 and discharge pipes 62 are shown in FIGS.
As shown, when the carriage 20 is moved to a predetermined rubber hose vulcanization position within the vulcanizer 10, it is provided to face each manifold 52, 54.

These supply pipes 60 and discharge pipes 62 are always connected to the trolley 2.
0, but when the unvulcanized rubber hose 24 is cured, it is made to protrude inward from the vulcanizing can 10 from the retracted position, and each maniol)"52. 54, respectively.

That is, as shown in detail in FIG. 3, a cylindrical holster 6 is attached to the can body 14 of the vulcanizing can lO so as to face the second hold 52 (54) since the cart 20 has been moved to the vulcanizing position.
4 are provided. This cylindrical Orgu 64 is a vulcanizing can 1
The guide bush 66 is airtightly fitted to the inner surface of the guide bush 66. A supply pipe 60 (discharge pipe 62) is fitted into the inner surface of the guide bush 66 via a sliding bush 68 in an airtight and slidable manner.

The base end (the end on the outside of the vulcanizing can 10) of the supply pipe 60 (discharge pipe 62) is connected to the tip of the piston rod 74 of the cylinder 72. Further, the cylinder 72 is fixed to the cylindrical holter 64 via the bracket 70. The supply pipe 60 (discharge pipe 62) is thereby connected to the cylinder 7.
2 allows for reciprocating movement in the axial direction. As is clear from this, in this example, cylinder 7
2 constitutes a driving means.

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, a connecting pipe 7B (FIG. 2) is connected to the proximal opening of the through hole 76, and the supply pipe 60 is passed through this connecting pipe 78 and a flexible hose 79 connected to the connecting pipe 78. Steam is supplied to the tank, or steam is discharged from an exhaust pipe 62.

The connecting pipe 78 is connected to a long hole 8 formed in the bracket 70 so as not to obstruct the reciprocating movement of the supply pipe 60 (discharge pipe 62).
It is arranged to pass through 0.

On the other hand, the manifold 52 (54
) side, as shown in FIG. 3, a connecting hole 82 is provided at a position facing the supply pipe 60 (discharge pipe 62) at the vulcanization position of the carriage 20. Then, when the cart 20 is moved to the vulcanization position, the supply pipe 60 (discharge pipe 62)
When the cylinder 72 is operated to project the cylinder 72, its tip comes into contact with the connection hole 82 of the manifold 52 (54), and the through hole 76 of the supply pipe 60 (discharge pipe 62) is inserted into the manifold 52 (54).
4) is connected to the inner hole.

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 this apparatus 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
The manifolds 52 and 54 are connected to both shaft ends of 2 through the steam supply v3B and the steam exhaust pipe 40.

In this case, in this example, as described above, the manifold 52.
Since eight connection ports 56 and 58 are provided on each of the manifolds 54, a maximum of eight mandrels 22 can be connected to the manifold 52.
．． 54 can be connected. 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.
Push the cart 20 into the vulcanizing canner 0 until it faces the vulcanizing canner 0. In this case, it is convenient to use a mechanical spacer mechanism to define the movement position N (curing position) of the cart 20. .

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 the retracted positions and connect them to the connection holes 82 of the corresponding manifolds 52 and 54. After closing the opening of the can body 4, steam is supplied into the vulcanizing can 10 through the steam blow-off pipe 28, while the supply pipe 60° manifold 52. Steam 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. Therefore, the unvulcanized rubber hose 24
However, it is vulcanized efficiently in a short time without a large difference in degree of vulcanization between the inner and outer surfaces. At this time, the pressure and temperature of the steam flowing into the mandrel 22 can be adjusted independently of the steam introduced into the vulcanization can 10 depending on the type of rubber hose and the like.

When the scheduled vulcanization time has elapsed and the vulcanization operation for the unvulcanized rubber hose 24 is completed, 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 moved back using the cylinder 72 to separate them from each manifold 52, 54, and the lid 16 of the vulcanizing can 10 is opened, and the cart 20 is pulled out of the vulcanizing can 10. This completes a series of vulcanization operations for the unvulcanized rubber hose 24.

Although the embodiments of the present invention have been described in detail above, the present invention uses M58. It is possible to implement and configure the present invention in various forms and forms with various changes and modifications based on the knowledge of those skilled in the art, without departing from the spirit of the invention, such as by adopting other methods.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a vulcanizing device which is an embodiment of the present invention, FIG. 2 is a perspective view of the main part showing one operating state of the vulcanizing device, and FIG. FIG. 4 is an enlarged sectional view of a main part of the vulcanizing apparatus, and FIG. 4 is a sectional view showing the structure of a mandrel in the vulcanizing apparatus. FIG. 5 is an explanatory diagram for explaining a conventional example. lO: Vulcanized can 20: Cart 22: Mandrel 24: Unvulcanized rubber hose 28: N
Air blowing pipe 38: Steam supply pipe 40: Steam discharge pipe 52, 54: Manifold 60: Supply pipe 62: Discharge pipe 72: Nlinda 82: Connection hole

Claims (3)

[Claims] (1) Insert an internally hollow mandrel with an unvulcanized rubber hose covered on its outer circumferential surface into a vulcanizing can, introduce a heating medium into the mandrel, and heat the unvulcanized rubber hose inside the vulcanizing can. A method of vulcanizing a rubber hose, which is characterized by heating from both the inside and outside together with a medium. (2) (a) a vulcanizing can; (n) an internally hollow mandrel; and (c) a cart for transporting the mandrel and the unvulcanized rubber hose covered on its outer circumferential surface into the vulcanizing can. , (d)
(e) a first supply pipe whose one end side is connected to the pipe communication section and extends from the truck, and whose other end side is connected to the shaft end of the mandrel on the truck; a first discharge pipe; and (f) a second supply pipe and a second discharge pipe, which are provided so as to pass through the vulcanizing can in an airtight manner, and whose tips are connected to the pipe connection part of the truck. Characteristic rubber hose vulcanization equipment. (3) In the vulcanizing apparatus according to claim (2), the second supply pipe and the second discharge pipe can be moved in and out, and the second supply pipe and the second discharge pipe are moved forward and backward by a driving means. A rubber hose vulcanizing device characterized by: