JPH11751A - Injection cylinder for light alloy injection machine - Google Patents

Abstract

(57) [Problem] To provide an injection cylinder for a light alloy injection machine that can perform work without pulling out a screw from a cylinder when performing maintenance and inspection of a backflow prevention device attached to a tip end of the screw. Make it an issue. SOLUTION: A cylinder 1 of an injection cylinder has a length such that a backflow prevention device mounted on the screw 4 is exposed when the screw 4 is advanced, and a tip cylinder is attached to a tip portion of the cylinder. The cylinder head 2 having the nozzle 3 was attached to the tip of the.
By removing the tip cylinder, the backflow prevention device 6 can be maintained and inspected without removing the screw 4 from the cylinder 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a light alloy injection machine, and more particularly to an injection cylinder for a light alloy injection machine.

[0002]

2. Description of the Related Art A configuration of a conventionally used injection cylinder for a light alloy injection machine will be described with reference to FIG.
As shown in the figure, a screw 4 is provided inside a cylinder 1 of the injection cylinder so as to be rotatable and to be able to move back and forth in the axial direction. A cylinder hopper port 11 for supplying a light alloy chip 12 is provided at an upper rear portion of the cylinder 1, and a cylinder head 2 having a nozzle 3 is fastened to a front surface of the cylinder 1 by a cylinder head bolt 7. A band heater 13 is attached to an outer peripheral portion of the cylinder 1, the cylinder head 2, and the like. A screw head 5 has a backflow prevention ring 6 at the tip of the screw 4.
It is attached with intervening.

Next, the operation of the above-described injection cylinder will be described. The solid light alloy chip 12 supplied from the cylinder hopper port 12 into the cylinder 1 is sent to the front of the cylinder 1 by the rotation of the screw 4. At this time, the light alloy chip 12 is brought into a semi-molten state by the heating by the band heater 13 and the shear heat generated by the narrowing of the groove space 14 of the screw 4, and the pressure of the screw 4 causes the cylinder 1 to move backward. Stored in front of Next, by moving the screw 4 forward, the light alloy in a semi-molten state is injected through the nozzle 3 into a mold (not shown). The backflow of the light alloy in the semi-molten state that occurs when the screw 4 moves forward is prevented by the backflow prevention device 6 attached to the tip of the screw 4.

[0004]

Since the conventional injection cylinder is configured as described above, it has the following problems.

A backflow prevention device used in a light alloy injection machine is used under severe conditions of high temperature and high pressure, so that maintenance and inspection work such as replacement of parts must be performed frequently.
In the maintenance and inspection work, first, the bolts for fastening the cylinder head to the cylinder are removed, and the cylinder head is removed. Next, the backflow prevention device built into the cylinder and integrated with the screw is pulled out together with the screw toward the front of the cylinder. After pulling out the screw, remove the backflow prevention device from the screw and perform maintenance and inspection such as replacing parts. As described above, when performing maintenance and inspection of the backflow prevention device, a large-scale operation of pulling out and pulling out the screw had to be performed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is necessary to pull out a screw from a cylinder when performing maintenance / inspection of a backflow prevention device attached to a tip end of the screw. An object of the present invention is to provide an injection cylinder for a light alloy injection machine that can perform work without any problem.

[0007]

The present invention has solved the above-mentioned problems as follows. Injection cylinder,
When the screw was advanced, the length of the backflow prevention device mounted on the screw was exposed, a tip cylinder was attached to the tip of the cylinder, and a cylinder head having a nozzle was attached to the tip of the tip cylinder. By removing the tip cylinder, maintenance and inspection of the backflow prevention device can be performed without pulling out the screw from the cylinder.

[0008]

DETAILED DESCRIPTION OF THE INVENTION An injection cylinder for a light alloy injection machine according to the present invention comprises a cylinder, a tip cylinder fastened to the front face of the cylinder, and a cylinder head fastened to the front face of the tip cylinder and having a nozzle. Become
When the screw is advanced, the front position of the tip cylinder
It is characterized in that it is defined so as to be behind the rear end position of the backflow prevention device mounted on the screw.

The cylinder head and the tip cylinder are preferably fastened together to the cylinder with a cylinder head bolt.

The tip cylinder is preferably fastened to the cylinder with a tip cylinder bolt. The tip cylinder is preferably fastened to the cylinder via a flange.

The tip cylinder is preferably fastened to the cylinder via a clamper.

[0012]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of an injection cylinder for a light alloy injection machine according to the present invention, and FIG. 2 is a configuration diagram showing a distal end portion of the injection cylinder shown in FIG.

As shown in FIG. 1, a screw 4 is provided inside the cylinder 1 of the injection cylinder so as to be rotatable and to be able to move back and forth in the axial direction. A cylinder hopper port 11 for supplying a light alloy chip 12 is provided at an upper rear portion of the cylinder 1, and a tip cylinder 21 is fastened to a front surface of the cylinder 1, and a cylinder head 2 having a nozzle 3 is provided at a front surface of the tip cylinder 21. Is tightened. A band heater 13 is attached to an outer peripheral portion of the cylinder 1, the tip cylinder 21, the cylinder head 2, and the like. A screw head 5 is attached to the tip of the screw 1 with a backflow prevention device 6 interposed.

The front position of the tip cylinder 21 is determined so as to be behind the rear end position of the backflow prevention device 6 mounted on the screw 4 when the screw 4 is advanced. The cylinder head 2 and the tip cylinder 21 are fastened together to the cylinder 1 with long cylinder head bolts 7.

As shown in FIG. 2, when performing maintenance and inspection such as replacement of parts of the backflow prevention device 6, the screw 4 is advanced, the bolt 7 for the cylinder head is removed, and the cylinder head 2 is removed. Next, by removing the tip cylinder 21 that has been divided and easily removed from the cylinder 1, the backflow prevention device 6 attached to the tip of the screw 4 is exposed from the cylinder 1. Thereby, the backflow prevention device 6 integrated with the screw 4 is moved from the cylinder 1 to the screw 4
Maintenance and inspection can be performed without pulling out

In the above-described embodiment, the cylinder head 2 and the tip cylinder 21 are configured to be fastened together with the cylinder 1 with the long cylinder head bolts 7. However, the present invention is not limited to this. You can also.

In the configuration shown in FIG. 3, the tip cylinder 21 is fastened to the cylinder 1 with the tip cylinder bolt 7.
The cylinder head 2 is fastened to the tip cylinder 21 by a cylinder head bolt 22.

In the configuration shown in FIG. 4, in the configuration shown in FIG. 3, the tip cylinder 21 and the cylinder 1 are tightened via the flanges 21a, 1a.

In the structure shown in FIG. 5, the front cylinder 21 and the cylinder 1 are tightened by the flanges 21a, 1a shown in FIG.
Instead of using the clamper 23.

[0020]

The injection cylinder for a light alloy injection machine according to the present invention is constructed as described above, so that the following effects can be obtained. (a) When performing maintenance and inspection such as replacing parts of the backflow prevention device mounted on the screw, the user can work without pulling out the screw from the cylinder. This facilitates maintenance and inspection such as replacement of parts and improves productivity. (b) Safety can be improved because work can be performed without removing the hot screw. (c) During maintenance and inspection of the backflow prevention device, it is only necessary to raise the temperature up to the tip cylinder, which saves energy. (d) In many cases, when replacing a cylinder, it is not necessary to replace the complete cylinder, and only the severely damaged tip cylinder needs to be replaced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an injection cylinder for a light alloy injection machine according to the present invention.

FIG. 2 is a configuration diagram showing a distal end portion of the injection cylinder shown in FIG.

FIG. 3 is a configuration diagram showing a tip portion of another injection cylinder.

FIG. 4 is a configuration diagram showing a tip portion of another injection cylinder.

FIG. 5 is a configuration diagram showing a tip portion of another injection cylinder.

FIG. 6 is a longitudinal sectional view of a conventional injection cylinder for a light alloy injection machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder 1a, 21a Flange 2 Cylinder head 3 Nozzle 4 Screw 5 Screw head 6 Backflow prevention device 7 Cylinder head bolt 11 Cylinder hopper port 12 Light alloy chip 13 Band heater 14 Slot space 21 Tip cylinder 22 Tip cylinder bolt 23 Clamper

Claims (5)

[Claims] An injection cylinder comprises a cylinder (1), a tip cylinder (21) fastened to the front surface of the cylinder (1), and a nozzle (3) fastened to the front face of the tip cylinder (21). The front end position of the tip cylinder (21) is higher than the rear end position of the backflow prevention device (6) mounted on the screw (4) when the screw (4) is advanced. An injection cylinder for a light alloy injection machine, wherein the injection cylinder is defined to be located rearward. 2. The light alloy injection machine according to claim 1, wherein the cylinder head and the tip cylinder are fastened together to the cylinder with bolts for the cylinder head. Injection cylinder. 3. The tip cylinder (21) is a cylinder (1).
2. An injection cylinder for a light alloy injection machine according to claim 1, wherein said injection cylinder is tightened by a tip cylinder bolt (22). 4. The tip cylinder (21) is a cylinder (1).
The injection cylinder for a light alloy injection machine according to claim 3, characterized in that the injection cylinder is fastened via flanges (21a, 1a). 5. The end cylinder (21) is a cylinder (1).
2. An injection cylinder for a light alloy injection machine according to claim 1, wherein the cylinder is fastened via a clamper (23).