JPS6026699B2 - Rubber tube continuous molding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing long rubber tubes such as gas rubber tubes and water supply rubber hoses with good working efficiency, and particularly to a continuous molding method for the rubber tubes.

Conventionally, in the manufacturing process of gas rubber pipes, for example, an unvulcanized rubber pipe extruded into a length of about 50 mm by an extrusion molding machine is wound spirally on a disc tray and then retold.

After that, the rubber tubes were not immediately carried into the vulcanizing can, but about 40 unvulcanized rubber tubes were successively extruded and individually rolled onto the disk tray and collected. Later, these disc trays are carried into the Kago can at one time and transported. As is clear from this, in the conventional batch carosulfurization, there is a break between the extrusion molding process of the vulcanized rubber tube and the vulcanization process, which inevitably causes a stagnation in the process flow. Moreover,
Since the extruded vulcanized rubber tube is heated to about 120°C during molding, flattening deformation called "sagging" occurs while it is being placed on the disc tray and waiting. Ru. Therefore, in order to prevent such deformation, the vulcanized rubber tube, which has been extruded and heated to a high temperature, is once forcedly cooled immediately after extrusion molding, but it is necessary to immediately move it to the vulcanization process. If so, it is clear that wasteful loss of thermal energy can be prevented, and work efficiency can also be improved. Furthermore, the above-mentioned vulcanized tubes differ depending on the type (horizontal type, vertical type) and purpose, but for example, in the case of a horizontal type vulcanized can used for vulcanizing gas rubber tubes, the diameter is approximately 1.5 mm x the length is 3.0 mm. The disc trays are usually arranged in one row in each row.
Since the pipes are sent to 5 units in 3 rows, the heat history of the unvulcanized rubber tubes reloaded in the upper tray and the unvulcanized rubber tubes layered in the lower tray during the vulcanization process is Therefore, the physical properties of the vulcanized rubber tube will naturally differ as well. In addition, since it is a so-called "open vulcanization" method in which vulcanization is performed by simply placing a winding layer on a disc tray and vulcanizing without any external restrictions such as molds, the dimensional accuracy of the finished product is determined by extrusion molding. It depends only on the molding accuracy at the time and the shrink rate during cooling. The present invention eliminates the above-mentioned drawbacks of the conventional batch vulcanization method, enables continuous molding operation of rubber tubes, greatly improves work efficiency, eliminates energy waste, and produces homogeneous products. The purpose of this method is to provide a continuous rubber tube molding method that allows users to cut extrusion-molded, unvulcanized rubber tubes of good length when actually using them. cutting the unvulcanized rubber tube in advance to a certain length that is approximately approximate to the length of the unvulcanized rubber tube, loading the unvulcanized rubber tube of this certain length into a vulcanization mold and vulcanizing it;
And, the press vulcanization is carried out to complete a desired vulcanization cycle while the vulcanization mold is circulated from the inlet to the outlet of the vulcanization chamber.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this molding method, as shown in FIG. 1, a known extrusion molding machine 1 is used, and an unvulcanized rubber tube 3 is continuously extruded through its cylinder head 2.

This raw rubber tube 3 is passed through a sizing cutter 4 disposed in relation to the extrusion molding machine 1, and is cut to a length convenient for use by the user (for example, 1, 1.5 skins). , 2 skin, 3 etc. length). In this case, the fixed size cutter 4 is composed of a cutter roll 6 having a cutting blade 5 and a receiving roll 7 for the cutter roll 6, and by changing the circumferential speed of each of these rolls, the cutting length of the rubber tube 3 can be arbitrarily determined. selected.
The unvulcanized rubber tube 3 thus cut into a predetermined length is then sent to a mold loading process. That is, as shown in FIG. 2, a pair of guide rails 8, 8 are laid below the rubber tube 3 fed out from the sizing cutter 4, extending in a direction perpendicular to the feeding direction. Although only one truck 1 is shown for convenience along these rails 8, 8, in reality, a plurality of trucks 1 are connected by a chain 9.
0 moves intermittently. Then, the lower mold 11 is carried by this trolley to the loading position of the rubber tube 3. In this invention, the lower mold 11 is provided with a plurality of recesses 12 that are bored parallel to the direction in which the rubber tube 3 is fed out by the sizing cutter 4 . Each recess 12 is
It has approximately the same length as the rubber tube 3 cut to a fixed size, and is formed in a semicircular cross section that approximately matches the circumferential surface of the rubber tube 3. Further, between each of the recesses 12 and the side surface of the lower mold 11, there is provided a lotus groove 13 formed into a branched shape like a sprue runner. Reference numeral 14 is a drive gear connected to an electric motor (not shown), and the lower mold 11 is pitch-fed with the interval between each recess 12 by the intermittent rotation of this drive gear 14. There is. Therefore, the rubber tube 3 sent out from the sizing cutter 4 is
They are sequentially loaded into corresponding slots 12. Each recess 12
When the loading is completed, the lower mold 11 is carried by the cart 10' in a predetermined direction, in this embodiment, to the left in FIG. 2, and the mold 15 is placed over it (FIGS. 3 and 4). reference)
. Although not illustrated in detail, the upper mold 15 includes a plurality of recesses 12 and a lotus groove 13 formed similarly to the lower mold 11. As a result, the rubber tube 3 is attached to the lower mold 1.
1 and the upper mold 15 in a space surrounded by the corresponding recesses 12, 12. The entire mold assembled in this way is generally designated by the reference numeral 18, and the check hole formed on the side of the mold by the lotus grooves 13, 13 is designated by the reference numeral 19. There is. Next, this mold 18 is conveyed to a vulcanization chamber 21 by a carry-in conveyor 20, as shown in FIG.

In this case, the vulcanization chamber 21 has a sideways cylindrical shell 22, and inside this cylindrical shell 22 there is a rotary drive shaft 23 inserted along the marling line of the cylindrical shell 22; A plurality of radially attached mold holding frames 24 which also serve as presses are provided, and in this embodiment, these holding frames 24 are rotated counterclockwise by a rotary drive shaft 23. The holding frame 24 is connected to the rotational drive shaft 23
It consists of a pair of heating plates 25, 25 which are attached to the mold 18 so as to be openable and closable via a hinge device (not shown), and which operate to pressurize the mold 18 from its upper and lower surfaces. There is. In this case, although not shown in the drawing, the heating plate 25 is integrally provided with heating means such as a heater wire. In addition, cylindrical shell 2
2 has an inlet 26 and an outlet 2 that are symmetrically bored.
7 and slidable lids 28, 29 for opening and closing them. In the above configuration, the carry-in conveyor 2
When the mold 18 carried by
will be held. In connection with this operation, the rotationally driven koji 2
3 rotates, and its pair of heating plates 25, 25
Wait with it open. Therefore, the mold 18 is inserted between the pair of heating plates 25, 25 through the entrance 26, and is held within the holding frame 24 by a pressing operation that closes the mold 18. Thereafter, the lid 28 is closed again, and the mold 18 is transferred toward the outlet 27 while rotating counterclockwise together with the holding frame 24 within the vulcanization chamber 21 . In this way, the molds 18 sequentially sent from the carry-in conveyor 20 are transferred to the respective holding frames 24 through the carry-in port 26.
It is held in the vulcanization chamber 21 and transferred in a predetermined cycle. When the position corresponding to the carry-out port 27 is reached, the pair of heating plates 25, 25 are opened, the lid 29 is slid upward, and the carry-out port 27 is opened, and the mold 18 is moved by an unillustrated carry-out mechanism. It is extracted from the holding frame 24 and transferred onto the carry-out conveyor 30 via the carry-out port 27. Thereafter, the upper mold 15 is removed from the mold 18, and the vulcanized rubber tubes ejected from each recess 12 are accumulated in a stocker or the like (not shown). To further explain the vulcanization process, as shown in FIG. Each is provided. This pipe 31 is designed to automatically insert iron into the opening 19 when the mold 18 is sandwiched between the heating plates 25 , 25 , and the rubber pipe 13 housed in each recess 12 Pressurized steam is supplied inside. Therefore, the rubber tube 13 is
It is heated from the inside and outside by the heater means built into the heating plate 25 and pressurized steam supplied from the pipe 31, and is vulcanized. The time required for vulcanization varies depending on the ratio of the vulcanizing agent added to the rubber material, etc., but the vulcanization between the rubber gaps 12 is completed while the rubber material is rotated 180 degrees from the loading port 26 to the loading port 27. What is necessary is to determine the rotational speed of the rotary drive shaft 23 so that the rotation is completed. As is clear from the description of the embodiments described above, according to the present invention, an unvulcanized rubber tube that is continuously molded by an extrusion molding machine is cut into predetermined lengths, and each of the unvulcanized rubber tubes is molded into a mold. By sequentially transporting them into the vulcanization chamber and pre-curing, it is possible to significantly improve work efficiency compared to the conventional batch vulcanization method, and to reduce wasted energy during vulcanization. omitted.

Furthermore, since each rubber tube is vulcanized under approximately the same conditions, there are various effects such as a more homogeneous product being obtained. Moreover, in this invention, the vulcanization chamber can be made smaller, which is advantageous in terms of cost and space.

In addition to the above-mentioned embodiments, the present invention also provides a structure in which, for example, the cylindrical shell constituting the heating chamber is of a vertically layered type, and a plurality of mold holding frames are mounted radially on a rotary drive ball oriented vertically inside the shell. It also includes modifications in which additional features are added.

[Brief explanation of drawings]

The figures are for explaining the molding method according to the present invention. Figure 1 is a perspective view of an extrusion molding machine and a sizing cutter rearranged in relation to it, and Figure 2 is a mold for a rubber tube. A perspective view for explaining the loading process, FIG. 3 is a perspective view of the mold, and FIG. 4 is a perspective view of the mold.
The figure is a longitudinal sectional view thereof, and FIG. 5 is a drawing for explaining the vulcanization process. In the figure, 1 is an extrusion molding machine, 3 is a rubber tube, 4 is a sizing cutter,
1 River trolley, 11 is the lower mold, 12 is the recess, 15 is the upper mold, 18 is the mold, 19 is the opening, 20' is the carry-in conveyor,
21 is a vulcanization chamber, 22 is a cylindrical shell, 23 is a rotational drive shaft,
24 is a holding frame, 25 is a heating plate, 26 is a loading port, 2
7 is an exit, 28 and 29 are lids, and 30 is an exit conveyor. Figure I Figure 3 Figure 4 Figure N Hinazu Town Boat

Claims (1)

[Claims] 1 Step of extruding a rubber tube, cutting the continuously extruded unvulcanized rubber tube into a certain length, and loading it into a vulcanization mold; A step in which the rubber tube is fed into a vulcanization chamber and the vulcanization of the rubber tube is completed by press vulcanization while the rubber tube is circulated through the vulcanization chamber through a predetermined vulcanization cycle.The rubber tube that has undergone the predetermined vulcanization operation is loaded. A continuous rubber tube molding method comprising the steps of sequentially sending out the mold from a vulcanization chamber and taking out a vulcanized rubber tube from the mold, the method comprising: A pressurized steam supply opening communicating with a rubber tube storage section is provided, and the vulcanization chamber is a cylindrical shell, and an inlet and an outlet for the vulcanizing mold are formed in the cylindrical shell. A rotary drive shaft is provided in the shell, and a plurality of mold holding frames each consisting of a pair of openable and closable heating plates are radially attached to the rotary drive shaft, and the vulcanization is performed in relation to the mold holding frame. A pressurized steam supply means is provided in the mold for supplying pressurized steam through the opening, and the vulcanizing mold is carried into the vulcanization chamber through the carrying inlet and the mold holding frame is inserted into the vulcanizing chamber. vulcanizing the rubber tube by supplying pressurized steam from the pressurized steam supply means into the mold while heating the vulcanizing mold while rotating and moving toward the outlet. A continuous rubber tube molding method characterized by: