JPH0637059B2 - Rubber hose vulcanizer - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a rubber hose vulcanizing apparatus.

(Prior Art) Conventionally, in order to vulcanize an unvulcanized rubber hose, it is often carried out by placing it in a vulcanizing vessel and introducing pressurized steam. It is not good, and there is a drawback that it is costly for products with small lots. Further, continuous vulcanization using hot air at atmospheric pressure has been proposed, but it was difficult to employ such a method particularly in the case of a rubber hose having a reinforcing fiber layer.
That is, in the case of the hose, the temperature of hot air at normal pressure is
When the required vulcanization temperature is set, vulcanization starts from the surface side, and air contained in the reinforcing fiber layer and various substances contained in the rubber layer are gasified to form bubbles, which causes foaming phenomenon. It will be a defective product. Further, it is possible to treat the hot air at a temperature lower than the gasification temperature for a long time, but such a method is not practical because the apparatus becomes large.

(Problems to be Solved by the Invention) In view of the above situation, an object of the present invention is to provide a natural rubber, a synthetic rubber or other rubber hose having a reinforcing layer under normal pressure without generating bubbles in the rubber layer or the reinforcing layer. It is an object of the present invention to provide a vulcanizing device that can be vulcanized with hot air.

(Means for Solving the Problem) According to the present invention, the above object is to insert an unvulcanized rubber hose into a mandrel to transfer hot air at normal pressure, and to provide a heating zone through which the mandrel passes at least in a front stage and a rear stage. Divide,
This can be achieved by a vulcanizing device that vulcanizes the latter heating zone at a higher temperature than the former heating zone.

The temperature difference in the heating zone is set to the optimum condition according to each rubber type, but if the temperature difference is 30 ° C. or higher, good results are obtained.

(Function) The unvulcanized rubber hose attached to the mandrel is first heated by hot air having a temperature lower than the vulcanizing temperature during transfer in the vulcanizing furnace, and bubbles from the rubber layer and the reinforcing fiber layer are caused. Is not generated, and then heated by hot air having a vulcanization temperature. The temperature of the rubber layer rises in a temperature rising curve that substantially coincides with the vulcanization curve of the rubber, and the rubber can be vulcanized in a short time.

(Example) Hereinafter, a description will be given together with an example.

FIG. 1 shows a perspective view of the apparatus, and FIG. 2 shows an explanatory view.
In the figure, the vulcanization furnace (1) is formed in a sealable structure, and is provided with an electric heater inside to circulate hot air at normal pressure. The vulcanization furnace (1) is divided into upper and lower heating zones, has a partition wall (2) in the middle, and has an upper-stage furnace insulation shutter (3) that moves up and down in the opening, and opens and closes left and right. A lower furnace thermal insulation shutter (4) is installed. These shutters are manually operated by a hydraulic cylinder, an air cylinder, a motor or other appropriate means, and are opened when the mandrel (5) passes through the opening, and are normally moved to a closed position so as to seal the inside of the furnace.

The heating means provided in the heating zone has an electric heater (6) and a circulation fan (7) that causes the heat generated from the heater to flow as hot air, and guides the hot air to circulate in the direction of the arrow in FIG. A plate (8) and a current plate (9) are formed. The straightening plate
Since the temperature distribution in the furnace changes depending on the inclination angle of (9),
It is necessary to set it to the desired state. In the figure, heating means combining the above heater and circulation fan
(10) ... is provided in each of the upper heating zone and the lower heating zone, 7 places each, 14 places in total, and a temperature sensor (not shown) is installed in the furnace corresponding to each heating means to control individually. I can do it. By providing the plurality of heating means, a temperature difference can be provided to the hot air generated by each heating means, and the heating zone can be divided into a plurality of zones. In the figure, the heating zone is divided into a front stage and a rear stage, the lower furnace (11) is the front heating zone, the upper furnace (12) is the latter heating zone, and the rear stage is set to a higher temperature than the front stage. However, by adjusting the heating means, a heating zone of an intermediate temperature is provided, or the heating means near the opening is heated to a temperature higher than the heating means adjacent inward so that heat in the furnace does not dissipate. Zones can be provided and various configurations can be made. In addition, an air curtain may be provided between the heating zones, or a shutter interlocking with the shutters (3) and (4) may be provided (not shown).

The mandrel (5) to which the unvulcanized rubber hose (13) is attached is bent into various shapes so that the rubber hose can be vulcanized into a desired shape. As shown in FIG. A plurality of rows are fixed to the side surface of the base (14) in a standing state, and L-shaped mounting pieces (15) are fixed to both ends of the mounting base (14).

As the transfer means for holding and transferring the mandrel, the transfer chain belt (16) is used, but a robot or other suitable transfer means may be used. The chain belt
(16) is provided on both sides of the vulcanization furnace, and is passed over between the sprocket (17) inside the furnace and the sprocket (18) outside the furnace, and is appropriately driven by a motor or other intermittent drive device not shown. Intermittent exercise with the tact. The running chain is supported by rails and other guide means so as not to hang down, and stays (19) are attached between the chains on both sides (Fig. 4). A holder (21) having an insertion groove is fixed to a bracket (20) protruding from the side of the link of the chain belt (16), and the attachment piece (15) of the mounting base is attached to the insertion groove. ), And is detachably attached with bolts or other fastening means.

FIG. 5 shows a clamp (2 which is preferably used as a fastening means.
2) is shown. The clamp (22) is the holder (21) described above.
On the base (23) to be inserted into the insertion groove of the, a frame (24) having a U-shaped plane is formed, and a holding bolt (2) is attached to the tip of the frame (24).
The presser link (26) having 5) is pivotally attached (27) to the presser link.
A connecting link (28) is pivotally attached (29) to an intermediate portion of (26), and (6th
(Fig. 7), the other end of the connecting link (28) is pivotally attached (32) to a handle (31) pivotally attached (30) to the frame (24). When the handle (31) is upright (Fig. 6),
The holding bolt (25) at the tip of the holding link (26) tightens the mounting piece (15) and holds the mounting base (14) so as not to fall off. As shown in FIG. 7, the handle (31)
When the lever is turned over, the holding bolt (25) is moved upward, the mounting piece (15) is released, and the mounting base (14) can be taken out. Thus, using the clamp (22),
The mounting base (14) can be attached to and removed from the transfer means very easily and in a short time, and the workability is good.

At the opening of the vulcanization furnace (1), a working stage (3) for approaching the mandrel exiting from the vulcanization furnace by the transfer means is provided.
3) is provided (Figs. 1 and 8). The work stage (3
3) is provided so that it is easy for an operator to pull out a vulcanized rubber hose or insert an unvulcanized rubber hose. When inserting it, apply silicon oil or other lubricant to the mandrel or drop it,
The receiving groove (34) for that is formed in the upper part, and the inclined plate (35) is provided on the front surface.
Has been formed. The work stage (33) has a fixed part (36).
And a movable part (37), and the movable part (37) is provided with a bearing (38) below and the bearing (38) slides on the rail (39). The fixed portion (36) is provided with a hydraulic cylinder (40), and the rod (41) of the hydraulic cylinder (40) is connected to the movable portion. Then, by the hydraulic cylinder (40), the movable part (37) is separated from the vulcanization furnace (1) when the mandrel (5) moves, and the vulcanization furnace (1) when the mandrel movement is stopped. ) To move back and forth. By providing the work stage in such a manner that it can move forward and backward, the worker can easily perform the work, and the mandrel movement is not hindered. The rubber hose may be attached and detached by a robot.

In the heating zone, the vulcanization temperature is set depending on the type of rubber material to be vulcanized, the structure of the product, and the like. For example, SBR, CR
In an example using a rubber material such as, the heating zone of the lower furnace (11) is set to about 130 ° C, the heating zone of the upper furnace (12) is set to about 170 ° C, and the temperature difference between both heating zones is 30 ° C or more. , Preferably 40
A rubber hose having a reinforcing fiber layer between the inner rubber layer and the outer rubber layer adjusted to ℃ or higher was inserted into the mandrel and circulated in the vulcanizing furnace by the transfer means. The vulcanization was completed in about 40 minutes.
When the temperature difference was less than 30 ° C, a foaming phenomenon occurred.
In the above products, the heating zone of the lower furnace (11) is about 1
40 ℃ ± 10 ℃, heating zone of upper furnace (12) is about 190
It was confirmed that vulcanization can be carried out at a temperature of ± 10 ° C without foaming in general.

The transfer means is equipped with a mounting base (1
Since 4) is supported and circulated, it is possible to simultaneously mount the mandrel in various shapes and mount it on the transfer means for vulcanization. If a post-process is provided after the work stage, the flow is simplified and the processing lead time can be shortened.

(Effects of the Invention) The present invention is configured as described above, and vulcanization with unpressurized hot air is performed at least in the first and second heating zones and performed at the first half low temperature and the second half high temperature, and the total vulcanization time is steamed. Since it is made longer than in the case of vulcanization so that the temperature of the rubber layer can be raised with a temperature rising curve that substantially matches the vulcanization curve of rubber, a reinforcing fiber layer is provided between the inner rubber layer and the outer rubber layer. Even with a rubber hose, the foaming phenomenon does not occur, the difference in vulcanization density between the inside and the surface of the hose can be reduced, and a product having excellent physical properties, adhesive strength, and breaking strength can be obtained. Also, since the inside of the vulcanizing furnace is divided into upper and lower heating zones for circulation,
Since the temperature difference can be easily controlled and the work stage can be moved forward and backward, it is safe and easy to attach and detach the rubber hose to and from the mandrel. Since the mandrel circulating in the furnace only needs to be replaced, it can be manufactured at the same cost as large lot production.

[Brief description of drawings]

The drawings show an embodiment of the present invention, FIG. 1 is a perspective view, FIG. 2 is an explanatory view, and enlarged below, FIG. 3 is a longitudinal sectional view, and FIG.
FIG. 5 is a perspective view of a holder portion of the transfer means, FIG. 5 is a perspective view of a clamp, FIG. 6 is a side view in a state in which the clamp is fastened, and FIG. 7 is a side view in which a handle is tumbled, and FIG. Is a sectional view mainly of a work stage. 1 ... Vulcanizing furnace, 3 ... Upper furnace thermal insulation shutter 4 ... Lower furnace thermal insulation shutter, 5 ... Mandrel 6 ... Electric heater, 7 ... Circulation fan 10 ... Heating means, 11 ... Lower furnace , 12 …… Upper furnace 21 …… Holder, 22 …… Clamp 33 …… Work stage

Claims (3)

[Claims] 1. A plurality of heating means having a vulcanization furnace for circulating hot air, provided with a transfer means for holding and transferring a mandrel for mounting an unvulcanized rubber hose in the vulcanization furnace, and having a heater. Characterized in that the vulcanization furnace is divided into upper and lower heating zones, the transfer means circulates the upper and lower heating zones, and the upper heating zone is set to a higher temperature than the lower heating zone. A rubber hose vulcanizer. 2. A work stage is provided at an opening of the vulcanization furnace so as to be close to a mandrel discharged from the vulcanization furnace by the transfer means, and the work stage is moved from the vulcanization furnace when the mandrel moves. The vulcanization device for a rubber hose according to claim 1, wherein the vulcanization device for rubber hose is provided so as to be able to move forward and backward so as to approach when the movement of the separating mandrel is stopped. 3. The vulcanization of a rubber hose according to claim 1, wherein the transfer means for holding the mandrel has a holder, and the mounting base of the mandrel is inserted into the holder and detachably fastened with a clamp. apparatus.