JPS5988510A - Production of pillar-shaped spring stand - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a columnar fountain using waste plastic as a molding material.

At railroad crossings, there are relatively many slip accidents caused by vehicles crossing the crossing due to frozen snow.One way to prevent this is to install fountains and spray water from the nozzles of the fountains to clear the ice. method has been adopted. Conventional methods for manufacturing fountain stands used for this type of fountain include a method in which pipes and nozzles are set in a frame shape on-site and concrete is poured in, and a method in which a manufactured concrete panel with pipes and nozzles already buried is laid. However, the former requires labor because it is difficult to remove it for repairs after the fountain stand is completed, and the latter has poor workability because it is made of concrete.

Therefore, the present invention utilizes waste plastic, which is lightweight and has good abrasion resistance, as a molding material for fountain stands, and makes it possible to rationally manufacture fountain stands without causing deformation or displacement of the water supply pipe with the nozzle. It is intended to provide a manufacturing method, and the gist is 6. When manufacturing a fountain stand in which a water supply pipe with an injection cylinder protruding in a right angle direction is integrally buried,
The purpose of the present invention is to manufacture a columnar fountain by supporting a water supply pipe in a mold by its both ends and an injection cylinder, and press-fitting a molded mold made by heating and melting waste plastic into the mold.

That is, according to the manufacturing method of the present invention, there is an operational advantage that the water supply pipe can be set correctly in the required position in the mold without using a special jig at full heat, and the water supply pipe and It is possible to manufacture at low cost a fountain stand that completely eliminates the inconvenience of clogging of the injection tube, and it is extremely useful as a manufacturing technology for columnar fountain stands that utilizes waste plastic.

The details of the present invention will be explained below with reference to the accompanying drawings.

First, the columnar fountain stand manufactured by the method of the present invention will be explained with reference to FIGS. 1 and 2. The main body l made of waste plastic has a rectangular parallelepiped shape, and a water supply pipe 2 is buried in the inner layer. There is. On this water supply pipe 2, a mouth pipe 3 is provided to protrude orthogonally to the axial direction of the water supply pipe 2, and the mouth pipe 3 has an injection cylinder with an injection surface portion 4a exposed on the upper surface of the main body 1. 4 is installed. In addition, four parts 5 are provided on both left and right end surfaces of the main body 1 for fitting connection fittings (not shown) used for connecting the main bodies 1 to each other, and a water supply pipe 2 is inserted into the four parts 5.
Both ends 2a of are protruding. 6 is an injection hole of the injection cylinder 4, and 7 is a cushioning rubber gasket provided at the fitting portion of the mouth pipe 3 and the injection cylinder 4.

Next, the mold used for carrying out the method of the present invention will be explained. As shown in FIGS. 3 to 5, the mold generally designated by the reference numeral 11 is a long frame having a rectangular cross-sectional shape. The frame 12 consists of a body 12, a bottom plate 13 that can be assembled freely by placing it on the bottom [112b] inside the frame 12, and a presser cover 14 that can be assembled freely on both left and right end faces. An injection port 15 is provided at approximately the center of the upper surface 12a. This injection port 15 can be opened and closed by the opening/closing plate 6 which is slidably attached to the frame 12, and F is the opening/closing plate 16.
The opening/closing plate 16 and the guide plate 17 are provided with holes 16a and 17a that can fit into the injection port 15.

On the bottom plate 13, there is provided a socket 18 into which the above-mentioned injection cylinder 4 can be inserted facing downward.
There are three receivers arranged vertically, and the bottom surfaces 18a of the receivers 18 located on the left and right outer sides are formed into slightly inclined surfaces. In addition, the presser cover 14 is provided with a bearing tube 19 projecting thereon that forms the recess 5 provided on both left and right end surfaces of the main body 1 of the molded product, and this bearing tube 19 is provided on both the inner and outer surfaces of the presser cover ■4. The outer periphery thereof is formed into an inclined surface whose diameter is slightly reduced toward the tip end. 21 is the bottom plate 13
22 is a reinforcing frame for the mold 11, and 23 is a lip fixed in the longitudinal direction of the bottom plate in order to change the thickness of the finished fountain stand.

Next, to explain the method of the present invention, first, the injection cylinder 4 is fitted into each mouth pipe 3 of the water supply pipe 2, and the injection cylinder 4 is fitted into the socket 18 on the bottom plate 13, and then the bottom plate 13 is attached to the frame body. Assemble to 12. Next, with both ends of the water supply pipe 2 fitted into and supported by the bearing cylinder 19, the presser cover 14 is attached to the frame 12, and the water supply pipe 2 is inserted into the mold 1 using an ordinary extruder (not shown). Molding material made by heating and melting waste plastic is press-fitted. The press-fitting pressure is about 30 VG, and after the press-fitting of the molding material is completed, the injection port 15 is closed and the mold 11 is cooled in the cooling medium. It is preferable to perform this cooling operation using a water tank. If a water tank is used, the cooling time is about 1.5 hours, and after the molding material in the mold 11 has hardened, the mold 1 is removed from the water tank. The bottom plate 13 is pulled out from the mold 11 to take out the molded product.

In the above manufacturing process, since the molding material made of waste plastic contains moisture, the molding material that is heated and melted and placed under high temperature generates voids during molding. Normally, these voids remain only in the intermediate layer of the molded product due to cooling after the molding material is press-fitted, but according to the method of the present invention, the surface side of the molded product (main body 1) and the area around the water supply pipe 2 are densely formed. Formed in tissue layers. This is because the surface side of the molded product and the periphery of the water supply pipe 2 are closer to the cooling medium when the mold 11 is cooled, and the cooling effect thereof is more active than in the middle layer, and the method of the present invention In the embodiment, especially the water supply pipe 2
This is because the mold 11 is communicated with the outside of the mold 11 through the bearing sleeve 19, which is a supporting member thereof, and the water supply pipe 2 is used as a connection for the cooling medium during the cooling operation.

Therefore, the fact that voids 1 remain in the middle layer of the molded product means that when the molded product is used, the water supply pipe 2 will not be affected by temperature changes in the outside air, and freezing inside the water supply pipe 2 will be prevented. It's easy to do. Further, it is effective for the surface side and the layer around the water supply pipe 2 to be dense in maintaining the required strength of the molded product.

In addition, in order to prevent the injection tube 4 from tilting toward the center due to contraction of the molded material when the molded material hardens, a cushioning gasket is provided around the outer periphery of the mouth tube 3 to the injection tube 4. In addition, when three mouth pipes 3 are provided on the water supply pipe 2 as in the illustrated embodiment, the mouth pipes 3 located on the left and right sides are slightly inclined outward in advance.
The above-mentioned receiver is designed so that when the injection cylinder 4 fitted into the mouth pipe 3 is fitted into the mouth 18, the injection surface portion 4a of the injection cylinder 4 can fit with the bottom surface 18a of the mouth 18.

The present invention is as described above, and the work of setting the water supply pipe in the mold uses both ends of the water supply pipe and the injection cylinder attached to the water supply pipe, and jigs other than the mold are set in the mold. It is unnecessary and easy to carry out, and the holding state of the bamboo water pipe is stable, preventing deformation of the water supply pipe that tends to occur during molding work. Since the molding material can be press-fitted into the mold from the top side of the mold, the problem of blocking the injection surface of the injection tube during molding can be completely eliminated.In addition, there are water supply pipes on both ends of the molded product. This method has the manufacturing advantage of being able to simultaneously form the four connecting parts, making it extremely effective as a method for manufacturing a columnar fountain using waste plastic as a molding material.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a molded product manufactured by the manufacturing method of the present invention, Figure 2 is a schematic cross-sectional view taken along line A-A in Figure 1, and Figure 3 is a mold used to carry out the manufacturing method of the present invention. Exploded perspective view,
Fig. 4 is a front sectional view of the mold bottom plate, Fig. 5 is a partially enlarged plan view of the vicinity of the injection port in Fig. 3, Fig. 6 is a sectional view taken along line B-B in Fig. 5, and Fig. 7 is a view of the water supply pipe. It is a front view. In the figure, 2 is a water supply pipe, 3 is a mouth pipe, 4 is an injection cylinder, 11 is a mold, 12 is a frame, 13 is a bottom plate, 14 is a presser cover, 15 is an injection port, 18 is a receiver, and 19 is the bushing.

Claims (2)

[Claims] (1) A water supply pipe with an injection tube connected perpendicularly to the axial direction is accommodated in the mold, and the injection tube is protruded from the bottom plate of the mold. are fitted into the bearing tubes protruding from the presser lids that close both left and right end surfaces of the mold, and then a molding material made by heating and melting waste plastic is press-fitted into the mold, and the molding inside the mold is carried out. A method for manufacturing a columnar fountain stand, characterized by curing the material. (2) A patented method characterized in that the inside of the water supply pipe is communicated with the outside of the mold to harden the molding phase material press-fitted into the mold.