JPH0551623U - Extruder for molding equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] A sealing material that prevents the synthetic resin raw material from leaking from the end of the cylinder on the side opposite to the molding die when a powdery synthetic resin raw material is used. The extruder of a molding apparatus capable of reducing the wear of the molding material and maintaining the leakage prevention effect of the synthetic resin raw material for molding for a long period of time. [Composition] An extruder of a molding device, which comprises a cylinder 3 and a screw rotating in the cylinder 3, heats and kneads a powdery synthetic resin raw material for molding, and sends it by pressure to a molding die. Sealing materials 11a, 11b, 11c sealed between the inner peripheral surface of the cylinder end portion 9 on the opposite side and the outer peripheral surface of the screw shaft 10, and the inner diameter of the cylinder end portion that divides the seal material into an intermediate portion of the sealing material. A disk 12 having a smaller outer diameter, a lid plate 13 attached to an end portion of the cylinder to prevent the seal material from coming out, and an oil supply device 14 capable of pressurizing and oiling the seal member during molding are provided. Constitution.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an extruder of a molding device used for extrusion molding or injection molding.

[0002]

[Prior Art]

 FIG. 2 is a cross-sectional view showing the configuration of an extruder (hereinafter referred to as an extruder) of a conventional molding apparatus used for extrusion molding or injection molding. In FIG. 2, a granular (pellet) or powdery (powder) thermoplastic synthetic resin material for molding is supplied from a hopper 2 of an extruder 1 into a cylinder (barrel) 3 heated by a heater, and the cylinder 3 The raw material resin is heated and kneaded by the rotation of the screw 4 provided inside, and is sent by pressure from a nozzle 5 mounted at the tip of the cylinder 3 to an injection molding die (not shown) (hereinafter referred to as a molding die). Is manufactured.

A heater (not shown) is attached to the outer periphery of the cylinder 3 so that the raw material synthetic resin inside the cylinder 3 can be heated to a predetermined temperature. A screw 4 is inserted in the cylinder 3 with a very small gap on the inner surface of the cylinder 3 or in a sliding state, and is rotated by a motor 6 to feed the raw material resin 7 supplied into the cylinder 3. The kneading is performed and pressure is fed from the nozzle 5 to the molding die.

During molding, since the pressure of the molten raw material resin supplied to the molding die is high, the internal pressure of the cylinder end portion 9 on the side opposite to the nozzle 5 is also higher than the external pressure, and powdery molding compound is used. When a resin raw material is used, the synthetic resin raw material for molding leaks out from between the inner peripheral surface of the cylinder end portion 9 opposite to the nozzle 5 and the outer peripheral surface of the screw shaft 10 at the same portion. A sealing material was inserted in the same portion, or a groove was formed on the outer peripheral surface of the screw shaft 10 in the same portion.

[0005]

[Problems to be solved by the device]

 However, in the above-mentioned conventional extruder, the sealing material inserted between the inner peripheral surface of the cylinder end portion 9 on the side opposite to the molding die and the outer peripheral surface of the screw shaft 10 at the same portion rotates the screw shaft 10. As a result, there was a problem in that the effect of abrasion was reduced due to wear and the effect of preventing leakage was reduced, and the effect of preventing leakage was insufficient in the groove formed on the outer peripheral surface of the screw shaft 10 at the same portion during high-pressure injection molding.

This invention was made in order to solve the above-mentioned problems of the prior art. When a powder-like molding synthetic resin material is used, the cylinder end portion on the side opposite to the molding die is used. Provided is an extruder for a molding device capable of preventing the leakage of the synthetic resin raw material for molding from 9 and reducing the wear of the enclosed sealing material to maintain the leakage prevention effect of the synthetic resin raw material for molding for a long period of time. The purpose is that.

[0007]

[Means for Solving the Problems]

 Therefore, the extruder of the molding apparatus according to the present invention is equipped with a cylinder and a screw rotating in the cylinder, and extrudes the molding apparatus for heating and kneading the powdery synthetic resin raw material for pressure molding and feeding it to the molding die. In the machine, the sealing material sealed between the inner peripheral surface of the cylinder end portion on the side opposite to the molding die and the outer peripheral surface of the screw shaft, and the sealing material interposed in the intermediate portion of the sealing material A disc having an outer diameter smaller than the inner diameter of the cylinder end portion to be divided, a cover plate attached to the cylinder end portion to prevent the sealing material from coming out, and an oil supply device capable of pressurizing and supplying oil to the seal member at the time of molding The above-described object is achieved by the constitution characterized by the above.

[0008]

[Action]

 With the above configuration, it is possible to manufacture a molded product by heating and kneading the powdery synthetic resin raw material for molding by the rotation of the screw equipped in the cylinder and pressure-feeding it to the molding die.

The leakage of the powdery synthetic resin material for molding from the end portion of the cylinder on the side opposite to the molding die is prevented by the sealing material sealed between the inner peripheral surface of the cylinder and the outer peripheral surface of the screw shaft. It is possible to prevent the wear of the seal material by supplying oil from the oil supply device to the seal material.

In addition, the above-mentioned oil supply is the oil supply pressurized at the time of molding, and can be balanced with the pressure of the synthetic resin raw material for molding in the cylinder. In addition, a disc with a smaller outer diameter than the cylinder inner diameter is interposed in the middle part of the seal material to form an oil reservoir on the cylinder inner peripheral surface of the part where the seal material is divided, stabilizing and improving the lubrication performance, and enclosing the seal. The wear of the material can be reduced, and the effect of reliably preventing the powdery synthetic resin raw material for molding from leaking over a long period of time can be maintained.

[0011]

【Example】

 Hereinafter, the extruder of the molding apparatus according to the present invention will be described with reference to examples. FIG. 1 is a longitudinal sectional view of an essential part of an embodiment of the present invention, which is a sectional view showing a cylinder end portion on a side opposite to a mold which is a feature of the present invention.

The configuration of the parts other than the above is shown in FIG. 2 in which the powdery synthetic resin raw material for molding is provided with a cylinder and a screw rotating in the cylinder and heated and kneaded and pressure-fed to a molding die. The configuration is similar to or equivalent to that of a conventional extruder, and a duplicate description will be omitted.

Referring to FIG. 1, the extruder of the molding apparatus according to the present invention has a suitable structure between the inner peripheral surface of the cylinder end portion 9 on the side opposite to the molding die and the outer peripheral surface of the screw shaft 10 at the same portion. A sealing material having various thicknesses, in this embodiment, a plurality of sealing materials 11a, 11b, 11c are enclosed. A disk 12 having a diameter smaller than the inner diameter of the cylinder end portion 9 is interposed between the seal material 11a and the seal material 11b in this embodiment when the seal material is filled.

A cover plate 13 is attached to the end surface of the cylinder end portion 9 to prevent the sealing materials 11 a, 11 b, 11 c from escaping from the cylinder end portion 9 due to the pressure in the cylinder 3. An oil supply pipe 15 from an oil supply device 14 is attached to the parts 11a, 11b, 11c.

Reference numeral 16 is a control box accommodating a control device for controlling the oil supply device 14, 17 is a lubricating oil tank, 18 is a spring for pressurizing the lubricating oil, and the oil supply device 14 is a sealing material at the time of molding. Apply pressure oil to the parts 11a, 11b and 11c. Further, the spring 18 can balance the pressure of the raw material resin inside the cylinder 3.

The outer diameter of the disk 12 interposed between the seal material 11 a and the seal material 11 b is smaller than the inner diameter of the cylinder end portion 9, and the outer peripheral surface of the disk 12 and the inner peripheral surface of the cylinder 3 are The annular space surrounded by the side surfaces of the seal member 11a and the seal member 11b is an annular space surrounded by the inner peripheral surface of the disk 12, the outer peripheral surface of the screw shaft 10, the side surfaces of the seal member 11a and the seal member 11b. A space is formed, which serves as a lubricating oil sump in which the lubricating oil supplied from the oil supply device 14 is accumulated to stabilize and improve the lubricating performance and reduce the wear of the sealed sealing materials 11a, 11b, 11c.

With the above-described structure, even when the powdery synthetic resin raw material for molding is used, the synthetic resin raw material for molding from the molding die, that is, the cylinder end portion 9 on the side opposite to the nozzle side is used. Leakage can be reliably prevented over a long period of time.

[0018]

【The invention's effect】

 As described above, according to the present invention, the powdery synthetic resin raw material for molding is heated, kneaded, and plasticized by the rotation of the screw equipped in the cylinder, and the powdered synthetic resin raw material is pressure-fed to the molding die to manufacture the molded product. it can.

The leakage of the powdery synthetic resin raw material for molding from the end portion of the cylinder on the side opposite to the molding die is prevented by the sealing material sealed between the inner peripheral surface of the cylinder and the outer peripheral surface of the screw shaft. It is possible to prevent the wear of the seal material by supplying oil from the oil supply device to the seal material.

Moreover, the above-mentioned oil supply is a pressurized oil supply at the time of molding and can be balanced with the pressure of the synthetic resin raw material for molding in the cylinder. In addition, a disc with a smaller outer diameter than the inner diameter of the cylinder is interposed in the middle part of the seal material to form an oil sump on the inner peripheral surface of the cylinder where the seal material is divided, stabilizing and improving the lubrication performance, and enclosing the seal material. It is possible to reduce the wear of the powder, and it is possible to reliably maintain the effect of preventing the powdery synthetic resin raw material for molding from leaking out over a long period of time.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main part of an embodiment.

FIG. 2 is a cross-sectional view of a conventional extruder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Extruder 3 Cylinder 4 Screw 5 Nozzle 9 Cylinder end part on the side opposite to a molding die 10 Screw shaft of the cylinder end part 11a, 11b, 11c Sealing material 12 Disc 13 Cover plate 14 Oil supply device

Claims (1)

[Scope of utility model registration request] 1. An extruder of a molding apparatus, comprising a cylinder and a screw rotating in the cylinder, for heating and kneading a powdery synthetic resin raw material for molding, and sending the raw material by pressure to a molding die. Is smaller than the inner diameter of the cylinder end portion that seals the seal material between the inner peripheral surface of the cylinder end portion and the outer peripheral surface of the screw shaft on the opposite side and the seal material that is interposed in the intermediate portion of the seal material. Diameter disk, and a lid plate that is attached to the end of the cylinder to prevent the sealing material from escaping,
An extruder for a molding apparatus, comprising an oil supply device capable of pressurizing and supplying oil to the seal member during molding.