JP3045524B2 - Press mold for escalator handrail - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an escalator handrail press die for pressing and vulcanizing an escalator handrail molded product. Related to press dies.

[Prior Art] Generally, an escalator handrail (hereinafter referred to as a handrail) is a product obtained by laminating a laminate composed of a canvas, a tension member, and the like with a rubber material, pressing the laminate under heating by a press die, and vulcanizing the product. And

At this time, the press die used includes an upper die 11, a lower die 12, and a core 13 as shown in FIG. 5, and the core 13 is connected to the upper die 11 and the lower die by a support (not shown). It is supported between the mold 12. In the vulcanization, after supplying the rubber material 15 to the core, the lower mold 12 is raised by a drive device such as a hydraulic cylinder, and both the rubber material 15 and the core 13 are pressed against the upper mold 11 for a predetermined time. This is performed by pressure molding.

Thereafter, when the lower mold 12 is lowered, the vulcanized rubber material 15 (molded product 15 ′) and the core 13 are lowered together with the lower mold 12 and separated from the upper mold 11. The core 13 and the lower mold 12 are separated from each other while being supported by the support during the lowering. Here, the upper mold and the like are cleaned, and the molded product 15 ′ is
And supply the next rubber material.

[Problems to be Solved by the Invention] By the way, in such a vulcanization step, when the lower mold 12 is lowered after vulcanization, the molded article 15 ′ is partially adhered to the upper mold 11, The product 15 'and the core 13 may not be lowered together with the lower mold 12, and may be in a state of being suspended in the air. In this case, the upper mold 11 and the molded product 15 'are conventionally separated using a hammer or the like, but the core 13 has a considerable weight, and such work is dangerous. In addition, work efficiency is poor. Further, there is a possibility that the product is scratched and the quality is reduced.

The present invention solves such conventional disadvantages, and provides an upper mold,
An object of the present invention is to provide a press die for an escalator handrail in which a core and a lower die can be easily separated and a safe and highly efficient operation can be performed.

[Means for Solving the Problems] In order to achieve such an object, a press die for an escalator handrail according to the present invention includes an upper die and a lower die which can be pressed and released by being relatively moved, and an upper die. The core is interposed between the mold and the lower mold to hold the molded product, and is supported by placing the end sides of the core at positions outside the longitudinal direction of the upper mold and the lower mold, respectively. And a through-hole provided in one of the lower mold and the upper mold to lock the lower mold and the upper mold at the time of detachment of the lower mold and the upper mold with either the lower mold or the upper mold. And a pin inserted into the through hole.

[Operation] After the rubber material to be molded is supplied to the core supported by the support means, the lower mold separated from one of the molds (for example, the upper mold) fixed to the main body approaches. Then, the rubber material and the core are pressed against the upper mold to perform predetermined vulcanization. Thereafter, when the lower mold is lowered to separate from the upper mold, the core is locked to the lower mold by the locking means and integrated. Accordingly, the core can be easily separated from the upper mold by forcibly detaching from the upper mold with the lower mold, even if the molded product is adhered to the upper mold. Further, the lower mold is moved to release the locking by the locking means before or when the core reaches the support means. When the core reaches the support, the lower mold is further lowered, so that the molded product and the core are separated from the lower mold. Thereafter, the process proceeds to the supply of the next rubber material to the core and the vulcanization process.

[Embodiment] Hereinafter, an embodiment of a press die for an escalator handrail according to the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, the press die for an escalator handrail mainly includes a long (about 5 m) upper die 1 fixed to a main body, and press-contact and release from the upper die 1. A lower mold 2 movable in the up and down direction, and a support table 4 provided outside the upper mold 1 and the lower mold 2.
An unvulcanized rubber material 5 is supplied to a C-shaped gap formed by combining these cores, and is molded under pressure under heating. The temperature required for sulfurization is maintained at, for example, 150 ° C to 160 ° C. The heating means may be a heater built in the upper mold 1 and / or the lower mold 2. In this embodiment, two cores 3 are provided, and two escalator handrails can be manufactured at the same time.

Further, an up-down driving device 6 for vertically moving the lower mold 2 is provided on the lower side of the main body. The vertical drive 6 preferably comprises a plurality of hydraulic cylinders, for example 240 tons (30 tons).
The lower mold 2 and the core 3 are pressed against the upper mold 1 at a pressure of about 8) to press the rubber material 5 supplied on the core 3 and vulcanize it into a C-shape. Mold.

Two support bases 4 are provided outside the upper mold 1 and the lower mold 2 in the longitudinal direction. Each support base 4 includes two support portions 41 fixed at a fixed height. The end portions 31 of the core 3 are supported by being placed thereon (FIG. 3). In addition, the core 3 is placed horizontally on the support 4 (in front of the main body).
A guide rail 7 for moving the guide rail 7 is provided.
The guide rail 7 pulls out the core 3 after the pressure treatment toward the front of the main body, and facilitates cleaning of the upper mold 1 and the lower mold 2.

The core 3 is mounted on the support base 4 when the apparatus is not operating, and a rubber material 5 as a handrail material is supplied from its longitudinal direction.

The rubber material 5 is a pre-vulcanized or semi-vulcanized material obtained by laminating a laminate including a canvas, a tension member and the like as necessary on a rubber material having excellent wear resistance and weather resistance such as chlorosulfonated polyethylene rubber, Usually, it is formed in a C-shape in advance, and is sequentially supplied to a press die in a continuous state from a preceding step (not shown).

The core 3 is, as shown in FIGS. 4 (a) and 4 (b),
It has an elliptical portion 32 and a trapezoidal portion 33 that engages with the lower mold 2 for molding the rubber material 5, while the lower mold 2 has a trapezoidal recess corresponding to the trapezoidal portion 33. The trapezoidal portion 33 and the concave portion are provided with a hole 8 penetrating therethrough in a direction orthogonal to the longitudinal direction, and a pin 9 serving as a locking means is inserted into the hole 8. One or more such holes 8 are provided in the center of the core 3 and the lower mold 2 in the longitudinal direction, or two or more at predetermined positions. When the lower mold 2 descends, the pins 9 are inserted to lower the core 3 into the lower metal. It can be lowered integrally with the mold 2.

The operation of the press die having such a configuration will be described.

When the rubber material 5 is supplied to the core 3 placed on the support base 4 in a continuous state from a previous process (not shown), the lower mold 2 is raised by the hydraulic cylinder 6 and the rubber material 5 is placed thereon. The child 3 is raised together and pressed against the upper mold 1. In this state, pressurization is continued at a predetermined vulcanization temperature for about 50 minutes to complete vulcanization molding.

Thereafter, the pin 9 is inserted into the hole 8 of the core 3 and the lower die 2, and the hydraulic cylinder 6 is driven and the lower die 2 is lowered. At this time, even if the rubber material (molded product) 5 ′ after vulcanization is adhered to the upper mold 1, the core 3 and the molded product 5 ′ descend integrally with the lower mold 2 by the pin 9 and move upward. Move away from mold 1.
Then, the molded product 5 'and the upper mold 1 are completely separated, and the core 3
The pin 9 is pulled out of the through hole 8 before reaching the support 4. The lower mold 2 is further lowered, but the core 3 is supported by the support 4 and separated from the lower mold 2.

Next, if necessary, the core 3 is pulled out toward the main body along the guide rail 7, and the upper mold 1 and the lower mold 2 are cleaned. Then, the molded product 5 'is moved in the longitudinal direction of the core 3 to The untreated rubber material 5 is supplied to the core 3, and similarly pressurized and vulcanized.

In this embodiment, the lower mold is moved with respect to the fixed upper mold. However, it goes without saying that the upper mold may be moved.

[Effects of the Invention] As is clear from the above embodiments, according to the press mold for an escalator handrail of the present invention, after pressing in a press mold including an upper mold, a lower mold, and a core, When the upper and lower molds are separated from each other, the core is locked to one of the molds, so that the core and these molds can be separated extremely easily, and work can be performed safely and efficiently. . Further, since it is not necessary to use a hammer or the like to separate the core from the upper mold, a high quality product can be provided with a high yield without fear of damaging the molded product.

[Brief description of the drawings]

1 and 2 are a front view and a side view, respectively, showing an embodiment of a press die for an escalator handrail according to the present invention, FIG. 3 is a view showing a support for a core, and FIG. 4 (a). ,
(B) is a diagram for explaining the operation of the embodiment, and FIG. 5 is a diagram showing a conventional press die for an escalator handrail. DESCRIPTION OF SYMBOLS 1 ... Upper mold 2 ... Lower mold 3 ... Core 31 ... End side of core 4 ... Support base 5 '... Molded product 8 ... Through-hole 9 ... Pin

Claims (1)

(57) [Claims] An upper mold (1) and a lower mold (2), which are relatively movable and can be pressed and released, and a molded product (5) interposed between the upper mold and the lower mold. ′) Holding core (3)
And a support base (4) for supporting the core by placing the end side (31) of the core at a position outside the longitudinal direction of the upper mold and the lower mold, respectively; In order to lock the core to either the lower mold or the upper mold when the upper mold is detached, the through-hole (8) provided in one of the molds and the core and the through hole A press die for an escalator handrail, comprising a pin (9) inserted into a hole.