JP2015161395A - Heater cooling pipe after installation of heat insulation cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that a heat insulation cover mounted with a cylinder heater part of a plastic molding machine prevents temperature from lowering.SOLUTION: A heater cooling pipe has such a structure that air jet ports 3 are made on both sides of a pipe 1, the pipe 1 is inserted between a heat insulation material comprising two layers, and air is passed between the two-layer heat insulation material. Also, the heater cooling pipe has such a structure that even if air is needed later, a heat insulation cover 5 in present use is drilled, the pipe 1 is inserted without recreating the heat insulation cover 5, and air is added for cooling.

Description

  In the present invention, a cylinder and a heater part of a plastic molding machine are quickly cooled with a heat insulating cover attached.

  A plastic molding machine has a cylinder for melting a resin as a product. The resin flows into the center (screw) of this cylinder, but the temperature is raised to the melting temperature with an electric heater attached to the outer layer of the cylinder in order to bring the resin to a melting temperature (about 200-300 ° C). Yes. Since it is exposed, the heat of the heater diffuses to the outside and is very inefficient. In recent years, an increasing number of companies have kept the cylinder warm with a heat insulating cover to suppress this energy loss. However, in recent injection molding factories, the work of changing the resin (the resin must be changed depending on the product to be molded, and the melting temperature differs depending on the resin, so the product whose melting temperature is lower than 300 ° C from the product molded at 300 ° C. If the resin melting temperature of the product is 200 ° C., the temperature of the cylinder must be lowered by 100 ° C.), and the temperature zone must be changed. When a heat insulating cover is attached to a cylinder or heater, the heat retaining power is large, so it is difficult to lower the temperature of the cylinder, and there are many factories that cannot be installed even though the energy saving effect can be understood. Insulation covers have been developed that can reduce the temperature of the cylinder even after the insulation cover is installed.

Patent Publication 2010-247458

  When a heat insulating cover is attached to the cylinder heater part of a plastic molding machine, the amount of electricity used is reduced due to the heat retaining effect, which leads to a reduction in electricity bills. However, there is a work to change the resin in the molding factory, and the resin (material) is changed depending on the product, but the temperature range of the heater is lowered (from 300 ° C to 250 ° C, etc.) ) Work occurred and the heater could not be lowered with the insulation cover attached, so the insulation cover could not be installed. Although the above problem seemed to be solved in Japanese Patent Publication 2010-247458, since air was jetted from above the two-layered heat insulating material, the air did not spread over a wide area and the cooling effect was small. Since it is necessary to make many air inlets to cool a wide area, the cost of the cooling device was high. Moreover, since cooling time became long, there was a concern about the electricity bill of the compressed air currently used. In addition, since it is made as a heat insulating cover with an air outlet, a heat insulating cover made without an air outlet can not be attached even if an air outlet is required later.

  An air outlet 3 is opened on both sides of the L-shaped metal pipe 1 so that air blown out from the air insertion port 3 flows to both sides. The inner surface of the heat insulating cover 5 is composed of two layers of a heat insulating material 7 such as glass wool. A hole through which the pipe 1 is passed is formed from the side surface of the heat insulating cover 5, and the pipe 1 is inserted between the two layers of the heat insulating material 7. In this structure, air passes between the heat insulating materials 7. Also, the pipe 1 is made to have a length that matches the size of the heat insulating cover. Even if the heat insulating cover 5 is attached to the cylinder 8, if air is needed later, a hole is inserted into the heat insulating cover 5 that is currently used and the pipe 1 is inserted without recreating the heat insulating cover 5 from the beginning. In addition, it was possible to cool by adding air.

  Air becomes easy to spread, so the cooling effect increases and the cooling time decreases. There is no wasteful cost because the time to blow air and the number of air insertion ports are reduced. Moreover, since it can be used for an existing heat insulating cover, there is no cost for recreating the heat insulating cover.

1 is a lateral view of the present invention. It is front sectional drawing of this invention.

Hereinafter, embodiments of the present invention will be described.
As shown in FIG. 1, a metal pipe 1 is processed into an L shape, and an air insertion port 2 for jointing with a compressed air supply hose is attached and brazed to the pipe tip. The air ejection ports 3 are opened on both sides of the pipe, and the pipe tip 4 is closed so that the air flowing from the air insertion port 2 comes out of the air ejection port 3. The heat insulating cover 5 is usually about 30 mm thick, but a hole of about 20 mm in the pipe insertion opening 6 is made so that the pipe 1 passes through the side so that the pipe 1 can be passed therethrough. As shown in FIG. 2, the heat insulating material 7 in the heat insulating cover 5 has two layers, and the pipe is inserted so as to pass therethrough. Attach compressed air supply hose (not shown) to the air insertion port 2 and introduce air. The air passes through the pipe 1, exits from the air outlet 3, passes through the heat insulating material 7, and spreads throughout the heat insulating cover 5. As a result, the entire heat insulating cover 5 is cooled, and the cylinder and heater in close contact with the heat insulating cover 5 are also cooled. As a result, the entire cylinder 8 can be cooled without being locally cooled.

  Japanese Patent Publication No. 2010-247458 is configured to send air in a direction perpendicular to the heat insulating cover, but the heat insulating material inside the heat insulating cover obstructs air circulation, and the air did not spread throughout. Also, a baffle plate was provided so that the cylinder was not cooled locally, but the baffle plate was rapidly cooled by receiving air from the front, and the cylinder was cooled locally. In the present invention, since air flows through the air layer between the two layers of the heat insulating material 7, the air spreads over the entire heat insulating cover 5, and the air is not sent vertically to the cylinder 8. You can also prevent. In addition, Patent Publication 2010-247458 was provided by attaching it to a heat insulating cover, but many customers have already attached the heat insulating cover with a different product, and customers who have not changed the resin need to change the resin later. In many cases, when trying to use the patent publication 2010-247458, the thermal insulation cover already used by the customer must be discarded and a new thermal insulation cover disclosed in the patent publication 2010-247458 must be purchased. Due to the characteristics of the heat insulating material, if it is used correctly, it will not deteriorate for 10 years (the heat insulating cover will fray or tear the sewn part), so if you purchase a new one, there will be a lot of loss. Even if the present invention is an existing heat insulating cover, the present invention can be used if the pipe insertion port 2 is opened.

1 Pipe 2 Air Insertion Port 3 Air Blowout Port 4 Pipe Tip 5 Heat Insulation Cover 6 Pipe Insertion Port 7 Insulation Material 8 Cylinder

Claims (3)

Drill holes on both sides of the metal pipe,
Processed so that the compressed air sent from the air insertion port circulates through the holes on both sides,
Insert the processed pipe into the insulation or insulation cover,
A pipe characterized by cooling cylinders and heaters that are kept warm in insulation by flowing compressed air. The pipe according to claim 1, wherein the pipe can be processed according to the length of a heat insulating material or a heat insulating cover to be inserted. 3. The pipe according to claim 1, wherein the flow rate of air coming out of the hole can be adjusted by changing the number of holes formed on both sides of the pipe.