KR100901992B1 - Cover of a protective box in a water meter and manufacture method of it - Google Patents

Abstract

A manufacturing method of a plastic container for a water meter is provided to simplify a mold because the mold is molded so that perpendicular reinforcement frame and horizontal reinforcement frame can be separated. A manufacturing method of a plastic container for a water meter comprises the steps of: injecting plastic materials into the hopper of the injection molding machine; supplying raw material put into in the feeding step and melting it by a heater; spraying resin raw on the mold(20) through a nozzle placed in the front end of the cylinder; supplementing the resin raw material with the secondary pressure through the nozzle when the resin raw material injected from the injection step is solidified; cooling the resin raw material by a cooling water line within the mold when supplement is finished in the pressure compensation step; and taking out a plastic container while the mold is opened when cooling of the resin raw material injected in the cooling step is finished and the plastic container is mold.

Description

Cover of a protective box in a water meter and manufacture method of it}

The present invention relates to a method for manufacturing a plastic tub for water meter, in detail, a plurality of horizontal reinforcing frames are formed horizontally on the outer circumference of the plastic barrel, and vertically reinforcing frames are formed vertically on the inner circumference of the inside and the outside. It is configured to reinforce the plastic barrel uniformly.

In general, the water meter protection box is installed to prevent freezing of the water meter in winter.

Such a conventional method of manufacturing a meter protective pail; Supplying waste plastic raw materials having a predetermined particle size into a hopper of an injection molding machine; A dissolution step in which the raw material introduced in the supplying step is supplied to the cylinder, and the waste plastic raw material stirred by the screw provided in the cylinder is dissolved by a heater provided on the outer periphery of the cylinder; An injection step of transferring the water support material dissolved in the dissolution step, and injecting the water support material into a mold through a nozzle provided at the tip of the cylinder; A pressure holding step of replenishing the water support material at a secondary pressure through the nozzle to compensate for shrinkage in the mold and volume reduction when the water support material injected in the injection step solidifies; A cooling step of cooling by cooling water circulating in the mold when the replenishment is completed in the holding step; When the cooling of the water support material injected in the cooling step is completed and the molding is completed in the meter protection container, the mold is opened and is composed of a take-out step of taking out.

As described above, the meter protective container manufactured by the method has a horizontal reinforcing frame formed at equal intervals by keeping the horizontal at the outer periphery, and the vertical reinforcing frame is vertically integrally formed to cross the horizontal reinforcing frame at the inner periphery.

Insulation material made of styrofoam or the like is inserted into the protective container, and the lid is closed to open and close. In addition, the lower portion is provided with a water connection pipe to which the water pipe is connected.

However, such a conventional protective barrel is formed so that the horizontal reinforcing frame and the vertical reinforcing frame protrude outwards at the same time to reinforce the strength, the reinforcement is concentrated to the outside, the inner strength is lowered. In addition, since the horizontal and vertical reinforcing frame is formed on the outer periphery of the protective container, the mold is complicated and its manufacture is not easy. Then, the heat is generated in the heat insulating material is inserted into the protective casing, the heat retention force is lowered. In particular, during the rainy season, water is introduced into the barrel, which causes a problem that the insulation is lost from the interior of the barrel. In addition, the lower region of the protective cylinder is formed to be curved, and thus problems such as lowering of the lower strength during installation (when filling) occur.

The present invention has been made to solve such a conventional problem, the present invention is configured to uniformly act the internal and external strength of the plastic tube for water meter, to prevent the flow of the heat insulating material is configured to excellent heat retention, the lower region It is to provide a method for producing a plastic barrel for a water meter is reinforced strength of.

The problem solving means of the present invention comprises the steps of supplying a plastic raw material to the hopper of the injection molding machine; A dissolution step in which the raw material introduced in the supply step is supplied and dissolved by a heater; An injection step of transferring the water support material dissolved in the dissolution step, and spraying the water support material to a mold through a nozzle provided at the tip of the cylinder; A pressure holding step of replenishing the water support material at a secondary pressure through the nozzle to compensate for shrinkage in the mold and volume reduction when the water support material injected in the injection step solidifies; A cooling step of cooling by the cooling water line in the mold when replenishment is completed in the holding step; And a take-out step in which the mold is opened and taken out when the cooling of the water support material injected in the cooling step is completed, and the molding is completed in the plastic barrel, wherein the center mold outer periphery of the mold Forming a plurality of vertical grooves, forming a horizontal groove on the inner periphery of the first and second molds on both sides of the center mold, characterized in that the vertical reinforcement frame and the horizontal reinforcement frame is molded on the inner and outer periphery of the plastic barrel during injection molding .

In addition, the present invention is a plastic barrel for a water meter to protect the water meter, the vertical reinforcing frame is formed projecting on the inner periphery of the plastic barrel, the horizontal reinforcing frame is formed projecting on the outer periphery, the lower inner side of the plastic barrel The first and second inner inclined ends are formed to be inclined on the front and rear surfaces, and the first and second outer inclined ends are formed on the lower outer front and rear surfaces of the plastic barrel to correspond to the first and second inner inclined ends.

The present invention is uniformly inward and outward by separately forming the central mold (core mold) and the first and second molds constituting the mold so that the vertical reinforcement frame and the horizontal reinforcement frame are separately formed in and out of the plastic container for water meter. One strength is reinforced, and the mold is formed to separate the vertical reinforcement frame and the horizontal reinforcement frame, and the effect of simplifying the mold is provided. Also, the styrofoam, which is inserted to prevent freezing, is closely adhered to the vertical reinforcement frame. As the flow is prevented, the insulation is not only excellent, but even when water enters the rainy season, the insulation is caught on the vertical reinforcing frame inside, so there is no risk of loss. .

Hereinafter, with reference to the accompanying drawings will be described specific details for the practice of the present invention.

In the accompanying drawings, Figure 1 is a process diagram of a manufacturing method of a plastic container for a water meter according to the present invention, Figure 2 is a block diagram of an injection molding machine used in the manufacturing method of a plastic container for a water meter according to the invention, 3 is a configuration diagram showing a state in which the barrel is manufactured in the method for producing a plastic container for water meter according to the present invention, Figure 4 is a perspective view of the state produced in the plastic container for a water meter according to the present invention.

As shown in Figures 1 to 4, the present invention provides a method for producing a plastic barrel for water meter instrument is a step of supplying a plastic raw material consisting of a largely appropriate particle size into the hopper of the injection molding machine; A dissolution step in which the raw material introduced in the supplying step is supplied to the cylinder, and the plastic raw material stirred by a screw provided in the cylinder is dissolved by a heater provided on the outer periphery of the cylinder; An injection step of transferring the water support material dissolved in the dissolution step, and injecting the water support material into the mold through a nozzle provided at the end of the cylinder; A pressure holding step of replenishing the water support material at a secondary pressure through a nozzle to compensate for shrinkage in the mold and volume reduction when the water support material injected in the injection step solidifies; A cooling step of cooling by cooling water circulating in the mold when the replenishment is completed in the holding step; When the cooling of the water support material injected in the cooling step is completed and the molding is completed in the plastic container, the mold is opened and is composed of a take-out step of taking out.

When described in detail with reference to the accompanying drawings for the plastic container manufacturing method for a water meter is configured as follows.

First, the injection step 100 begins with a supply step 110 of introducing a plastic material of a static particle size, that is, polypropylene (PP) into the hopper 11 of the injection molding machine 10.

The plastic raw material introduced into the hopper 11 is supplied to a cylinder 12 having a rear end connected to the bottom of the hopper 11. The cylinder 12 is a hollow cylindrical shape and a heater 14 is installed on the outer circumference thereof to dissolve the plastic raw material. The dissolution step 120 is followed.

On the other hand, the screw 15 coupled to both ends to facilitate the rotation inside the cylinder 12 to agitate the solid raw material by rotation and to be easily dissolved by the heat of the heater 14 and at the same time dissolution step 120 In this case, the raw material dissolved in the liquid phase having an appropriate viscosity by the heater 14 is moved to the nozzle 16 provided at the tip.

The raw material transferred to the nozzle 16 enters the injection step 100 in which the liquid raw material is injected at a predetermined pressure to the mold 20 connected to the tip of the nozzle 16 and the injection is performed.

The mold 20 has a central mold (21) provided at the center to form the inner circumference of the plastic barrel (1); The first and second molds 22 and 23 are symmetrically provided on the left and right sides of the central mold 21 to have the outer shape of the plastic barrel 1.

At this time, the inner periphery of the first and second molds 22 and 23 are horizontally maintained at equal intervals to form horizontal grooves 22a of appropriate depth, and are horizontally horizontal to the outer periphery of the plastic barrel 1 during injection molding. Reinforcement frame 30 is formed.

In addition, a plurality of vertical grooves 21a are formed on the outer circumferential edge of the center mold 21 between the first and second molds 22 and 23 to form an inner circumference of the plastic barrel 1 during injection molding. A plurality of vertical reinforcement frame 32 is formed to protrude vertically.

At this time, the vertical reinforcement frame 32 is formed so that its height is longer than the forming range of the horizontal reinforcement frame (30).

On the other hand, first and second outer inclined surfaces 21b and 21c are formed in the outer lower front and rear surface regions of the center mold 21 and correspond to the first and second outer inclined surfaces 21b and 21c. First and second inner inclined surfaces 22b and 22c are respectively formed in the molds 22 and 23 so that the first and second inner inclined ends 33a and 33b are inclined to the lower inner front and rear surfaces during the molding of the plastic barrel 1. ) Is formed, and the first and second outer inclined ends 34a and 34b are formed on the outer front and rear surfaces to reinforce the strength of the lower region of the plastic barrel 1.

In addition, a coolant line (not shown) through which coolant is circulated is formed in the first and second molds 22 and 23 and the central mold 21 to rapidly dissolve the raw material injected by the nozzle 16.

At this time, when the raw material of the liquid phase changes into a solid by the cooling water in the dissolved state, shrinkage of about 20 to 30% occurs and the volume decreases inside the first and second molds 22 and 23 and the space is reduced. In order to compensate for this problem, the above-described screw 14 inside the cylinder 12 moves forward at a higher speed, and pressurizes the pressure and supplements the raw material to compensate for the volume change in the step 200. Fold in

The plastic barrel 1 is formed into a more dense structure by the raw material and secondary pressure compensated in the holding pressure step 200, the pressure adjustment is made automatically by a pressure gauge (not shown), the set pressure As early as the nozzle 16 stops the injection of the raw material, and enters the cooling step 300, the next step.

In the cooling step 300 is made of quenching by the cooling water circulating the cooling water line not shown in the cooling step 300 in the cooling step 300 whether the cooling of the plastic barrel (1) is made by the signal of the temperature sensor and the cooling is completed Then, the nozzle 16 engaged with the injection passage 24 of the mold 20 is separated from the mold 20.

At this time, the screw 15 inside the cylinder 12 is rotated reversely so that the liquid raw material does not leak to the nozzle 16. As described above, since the cooling is performed in the state in which the mold 20 is bitten, the tolerance due to shrinkage is small, so that the standardized plastic barrel 1 can be manufactured.

Meanwhile, as shown in FIG. 3, the first and second molds 22 and 23 provided on the outside of the mold 20 in which the nozzle 16 is separated are horizontally provided by the cylinders 23a provided at the rear. When moving and separating from the center mold 21, one process injection molding is finally completed in the take-out step 400 for separating the cooled plastic barrel 1 from the center mold 21.

As such, the plastic barrel 1 injection-molded in the extraction step 400 is vertically maintained at its inner circumference as shown in FIG. 4 so that a plurality of vertical reinforcement frames 32 are formed to reinforce the internal strength. The horizontal reinforcing frame 30 is molded. At this time, the vertical reinforcing frame 32 is insulated (styrofoam) is inserted into the inside to prevent freezing in close contact with the flow is prevented to increase the warming effect and to prevent rain water from entering and leaving during the rainy season.

Then, the first and second inner inclined ends 33a and 33b are formed to be inclined on the inner lower front and rear surfaces of the plastic barrel 1, and the first and second outer inclined ends 34a and 34b are formed on the outer lower front and rear surfaces. It is formed to reinforce the strength of the lower region of the plastic barrel (1).

1 is a process chart for the plastic barrel manufacturing method for a water meter according to the present invention.

Figure 2 is a block diagram of an injection molding machine used in the plastic container manufacturing method for water meter according to the present invention.

Figure 3 is a block diagram showing a state in which the barrel is manufactured by a method for manufacturing a plastic barrel for water meter according to the present invention.

Figure 4 is a perspective view of a state produced by the plastic container manufacturing method for water meters according to the present invention.

<Description of the symbols for the main parts of the drawings>

1: plastic barrel 20: mold

21: center mold 21a: vertical groove

21b, 21c: First and second outer slope 22b, 22c: First and second inner slope

30: horizontal reinforcement frame 34a, 34b: the first and second outer slopes

32: vertical reinforcement frame 33a, 33b: 1st, 2nd internal slope

Claims (3)

Supplying the plastic raw material to the hopper of the injection molding machine; A dissolution step in which the raw material introduced in the supply step is supplied and dissolved by a heater; An injection step of transporting the water support material dissolved in the dissolution step, and spraying the water support material to the mold through a nozzle provided at the end of the cylinder; A pressure holding step of replenishing the water support material at a secondary pressure through the nozzle to compensate for shrinkage in the mold and volume reduction when the water support material injected in the injection step solidifies; A cooling step of cooling by the cooling water line in the mold when replenishment is completed in the holding step; In the manufacturing method of the plastic pipe for water meter, comprising a take-out step of the mold is opened and taken out when the cooling of the water support material injected in the cooling step is completed to form a plastic barrel, Forming a plurality of vertical grooves on the outer periphery of the center mold of the mold, The horizontal reinforcing frame is formed on the inner periphery of the first and second molds on both sides of the center mold, and the vertical reinforcing frame is formed on the inner periphery of the plastic barrel, and the horizontal reinforcing frame is formed on the outer periphery of the water meter. Method of making plastic barrels. The method of claim 1, wherein the first and second outer inclined surface is formed in the outer lower region of the central mold, First and second inner inclined surfaces are formed on the first and second molds to correspond to the first and second outer inclined surfaces, respectively, so that the first and second inner inclined ends are formed to be inclined to the lower inner front and rear surfaces during the molding of the plastic barrel, and the lower outer side. The first and second outer inclined end is formed on the front and rear surfaces to reinforce the strength of the plastic barrel lower region. In the plastic barrel for water meter to protect the water meter, A vertical reinforcing frame 32 is formed to protrude on the inner circumference of the plastic barrel 1, and a horizontal reinforcing frame 30 is formed to protrude on the outer circumference thereof. First and second inner inclined ends 33a and 33b are formed to be inclined on the lower inner front and rear surfaces of the plastic barrel 1, Water meters, characterized in that the first and second outer inclined ends (34a, 34b) formed on the lower outer front and rear surfaces of the plastic barrel (1) corresponding to the first and second inner inclined ends (33a, 33b) Plastic bucket for machine.

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