JP2992058B2 - Injection pump for hot chamber die casting machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection pump for a hot chamber type die casting machine, and more particularly to an injection pump in which a corrosion resistant material is embedded in a pump body to form an injection sleeve and a gooseneck portion. .

(Background technology)

2. Description of the Related Art Conventionally, a hot chamber type injection pump of a die casting machine often uses a method in which a molten metal in an injection sleeve is pressurized by an injection plunger and injected from a bottom through a gooseneck to a mold.

Corrosion-resistant materials such as ceramics are used for the sleeve and gooseneck portion of such an injection pump in order to improve the corrosion resistance against molten aluminum or the like. Of these, the goose neck portion is buried by casting or fitting, but the injection sleeve is exclusively of the fitting type due to positional accuracy such as axial alignment with the plunger.

Specifically, a structure is adopted in which a cylindrical injection sleeve is fitted in the axial direction and elastically sandwiched by the pump body, and the bottom opening of the injection sleeve communicates with the opening of the gooseneck portion embedded in the pump body. (Japanese Patent Application Hei 1-2475
No. 34).

3 and 4, the injection pump 60 includes a block-shaped pump main body 61 in the frame of a gate-shaped frame 70.

The pump body 61 includes a gooseneck portion 62 made of a ceramic tube material that has been pre-filled, and a base end thereof communicates with a bottom surface of a concave portion 61A formed from an upper surface.
The distal end is opened on the side surface of the upper protruding portion of the main body 61, and a nozzle 63 is attached to the opening.

Sleeves 64 to 67 made of ceramics are fitted into the concave portion 61A of the pump body 61.

A double tightening sleeve 64 as a tightening means for taper fitting is fitted into the bottom of the concave portion 61A, and an injection sleeve 65 is fitted inside thereof. A first pressing sleeve 66 is coaxially abutted on the upper end of the injection sleeve 65, and a second pressing sleeve 67 is coaxially abutted on the outer upper end of the fastening sleeve 64 along the peripheral surface of the recess 61A.

A basin 68 is formed between the pressing sleeves 66 and 67, and the basin 68 is provided with a supply pipe 69 from a molten metal holding furnace (not shown) on the side.
The molten metal is supplied through A, and the molten metal in the basin 68 is introduced into the injection sleeve 65 from the hole of the first pressing sleeve 66.

An injection plunger 65A is fitted into the injection sleeve 65 from above, and the plunger 65A is reciprocated by an injection cylinder 65B installed on the upper portion of the frame 70.
The molten metal inside is sent to the gooseneck portion 62 under pressure, and is injected from the nozzle 63 into the mold.

On the other hand, the pump body 61 is provided with an elastic holding mechanism 80 for holding the sleeves 64 to 67 including the injection sleeve 65.

A lower pressing plate 81 is disposed below the pump main body 61, and a cylindrical guide 84 is fixed to the lower pressing plate 81. A pressing force adjusting bolt 85 is threaded through the bottom surface of the guide 84, and a spring guide 86, a plurality of disc-shaped springs 87, and a spring receiver 88 are inserted into the guide 84, and the spring receiver 88 is a spacer.
It is in contact with the bottom surface of the pump body 61 via 89.

An upper pressing plate 82 is disposed above the pump body 61. The upper pressing plate 82 is in contact with the upper ends of the pressing sleeves 66 and 67, and the upper and lower pressing plates 81 and 82 are provided with a plurality of tie rods 83.
Are connected by

Due to the elastic repulsive force of the disc-shaped spring 87 transmitted through these pressing plates 81 and 82 and the tie rod 83, the second pressing sleeve 68 is pressed toward the pump body 61 and presses the tightening sleeve 64 to reduce its taper. By tightening in the radial direction by fitting, the pressure resistance of the injection sleeve 65 is increased. Similarly, the first pressing sleeve 66 is also pressed toward the pump main body 61, and a pressure seal is performed at a joint 62 </ b> A between the bottom opening of the injection sleeve 65 and the opening of the gooseneck 62. It should be noted that a ceramic sheet or the like is appropriately interposed in the joint 62A in order to improve the pressure sealing property.

[Problems to be solved by the invention]

By the way, in the injection pump 60 as described above, since the elastic clamping mechanism 80 is mechanical, the tightening force may be insufficient due to thermal deformation or the like of each part accompanying the injection operation, and the The pressure seal may be incomplete. If the pressure seal of the joint 62A is incomplete, there is a problem that the molten aluminum inside leaks out and the pump body 61 made of cast iron is eroded.

On the other hand, in order to ensure the pressure-sealing performance of the joint 62A,
If a sufficiently strong clamping force is applied to the elastic clamping of the injection sleeve 65, the structural elements such as the tie rods 83 and the disc springs 87 in the elastic clamping mechanism 80 cannot be avoided. There is a problem in terms of.

In addition, ceramics, graphite, etc. used for the injection sleeve 65 and the gooseneck portion 62 pressed at the joint 62A are relatively brittle, and when pressed with a strong force, chips or cracks are generated, which also causes leakage of the molten aluminum. There is a problem that causes.

SUMMARY OF THE INVENTION An object of the present invention is to provide an injection pump for a hot chamber type die casting machine, which is small and lightweight, has a simple structure, and can reliably seal a molten metal.

[Means for solving the problem]

The present invention comprises an injection pump provided with a corrosion-resistant injection sleeve buried in the pump body in the axial direction and inside thereof and a gooseneck portion for injecting molten metal from a heat-retaining furnace into a die apparatus of a die-casting machine. The injection sleeve for a hot-chamber die-casting machine in which the outer periphery of the injection sleeve is fixed by tightening means and the upper part thereof is fixed by the tightening means. The gooseneck portion is connected and connected to the hot water outlet, and the injection sleeve is pressed and fixed by pressing means via the tightening means, and the pressing means has a lower end surface which is in contact with an upper end surface of the tightening means. -Shaped pressing member and adjustment for attaching the pressing member to the pump body via a compression spring An injection pump for hot-chamber die casting machine, characterized in that it is configured to include a Flip and.

[Operation] In the present invention, by making the injection sleeve into a cylindrical shape with a bottom, the injection pressure acting inside the sleeve in the axial direction acts on the bottom surface so as to press the sleeve against the pump body. That is, the injection sleeve is held using the internal pressure of the injection sleeve.

For this reason, in the present invention, it is not necessary to separately perform strong tightening for holding the injection sleeve and connecting to the gooseneck portion, and a simple pressing means can be used, so that the conventional elastic clamping mechanism and the like can be omitted, and the structure is simplified. Thus, the size and weight can be reduced, thereby achieving the above object.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In FIG. 1 and FIG. 2, the injection pump 10 includes a gate-shaped frame 11, and a block-shaped pump body 20 is provided in the frame.

Pump body 20 has mounting flanges 21
This flange 21 is attached to the mounting step inside the frame 11.
It is supported and fixed to 12. In addition, the injection thrust is received between the flange 21 and the step portion 12 by vertical unevenness engagement.

A concave portion 22 is formed in the upper surface of the pump body 20, and a bottomed end cup 23 made of a corrosion-resistant material having a bottom is buried by casting. On one side of the pump body 20, a gooseneck portion 24 made of a pipe material of a corrosion-resistant material is embedded by casting. Goose neck part 24
20 is connected to the nozzle 13 installed on the upper side surface, and the base end side is fitted to the side surface of the end cup 23, and
It communicates with the inside of the recess 22 through 25.

In the concave portion 22 of the pump body 20, an injection sleeve 31, tightening sleeves 32 and 33 forming tightening means, and a pressing member 34 forming pressing means 39 are fitted.

The injection sleeve 31 is formed of a ceramic, which is a corrosion-resistant material, in the shape of a cylinder with a bottom, and the bottom is fitted to the end cup 23. On the side surface of the injection sleeve 31, a hot water port 35 is formed at a position corresponding to the hot water port 25 of the end cup 23,
The injection sleeve 31 is communicated with the gooseneck portion 24 through each of the hot water ports 25 and 35.

The inner and outer peripheral surfaces of the fastening sleeves 32, 33 are taperedly fitted to each other. The inner sleeve 32 is fitted to the outside of the injection sleeve 31, and the lower end is in contact with the end cup 23,
By displacing the outer sleeve 33 downward, the injection sleeve 31 can be tightened in the radial direction.

The pressing member 34 is made of cylindrical iron, is fitted in the concave portion 22, and has a lower end abutting on an upper end of the inner tightening sleeve 32. The pressing member 34 is urged downward by the repulsion force of the compression spring 34C adjusted by the adjusting screw 34B of the upper end flange portion 34A,
Thereby, the fastening sleeve 32 or the injection sleeve 31 is elastically held by the pump body 20. A compression spring 34 is provided between the lower end surface of the pressing member 34 and the outer tightening sleeve 33.
D is interposed, and the injection sleeve 31 is tightened by urging the sleeve 33 downward. Here, the pressing means 39 includes the pressing member 34 including the upper end flange portion 34A, the adjusting screw 34B, the compression spring 34C, and the compression spring 34D.

The pressing member 34 has a basin 36 inside, a lining 37 of a corrosion-resistant material is fitted on the inner peripheral surface, and the molten metal from a molten metal warming furnace (not shown) is supplied and stored by a supply pipe 38 connected to the side surface. You.

The injection plunger 40 is inserted into the pressing member 34 from above, and the tip is fitted into the injection sleeve 31. A hot water passage 41 is formed in the plunger 40 to communicate the front end surface and the side surface. The hot water passage 41 allows the molten metal in the pool 36 to flow into the injection sleeve 31 only when the plunger 40 moves upward.

The frame 11 is connected to the plunger 40 via the coupling 42.
The injection cylinder 43 supported by the
The plunger 40 is driven back and forth by 43.

In the present embodiment, with the reciprocating operation of the plunger 40, the molten metal in the well 36 is injected through the hot water passage 41 into the injection sleeve 31.
At the same time, the molten metal in the injection sleeve 31 is pressure-fed to the gooseneck portion 24 through the hot water ports 35 and 25, and is injected from the nozzle 13 into a mold (not shown). At this time, the internal pressure acts on the bottom surface of the injection sleeve 31 downward in the axial direction,
The injection sleeve 31 is pressed against the pump body 20.

According to this embodiment, the following effects can be obtained.

That is, by making the injection sleeve 31 a cylindrical shape with a bottom and communicating with the gooseneck portion 24 at the hot water port 35 on the side surface,
When the injection sleeve 31 is held by the pump body 20, the axial component of the injection pressure applied to the bottom surface of the injection sleeve 31 can be used.

For this reason, the holding structure of the injection sleeve 31 can be simplified, and simple tightening by the pressing member 34 and the compression spring 34C as in the above embodiment is sufficient.

Further, in order to increase the pressure resistance of the injection sleeve 31, the bottom portion is fitted into the end cup 23, and the portion above the middle portion is tightened with the tightening sleeves 32 and 33. In this tightening, the pressing member 3 is also used.
A simple tightening with a compression spring 34D between 4 is sufficient.

Therefore, the structure around the injection sleeve 31 can be greatly simplified. And the above-mentioned conventional injection pump
Since there is no need to provide an elastic holding mechanism 80 surrounding the pump body 61 as in the case of 60, the size and the weight can be reduced, and the manufacturing cost can be reduced and the handleability during manufacturing or use can be improved.

On the other hand, since it is not necessary to apply an excessive tightening force or the like, the injection sleeve 31, the end cup 23 or the gooseneck 24
No breakage or the like due to brittleness is caused in each of them, and a sealing failure due to the breakage can be avoided, and leakage of molten metal or the like can be reliably prevented.

It should be noted that the present invention is not limited to the above-described embodiment, and modifications within a range for realizing the present invention are included in the present invention.

For example, the axial tightening and radial tightening for the injection sleeve 31 are not limited to the structure using the tightening sleeves 32 and 33, the pressing member 34, the compression springs 34C and 34D, and the like.
An appropriate configuration may be adopted so as to obtain a necessary tightening force.

Further, the form and the like of the gooseneck portion 24 and the end cup 23 are arbitrary, and the embedding in the pump body 20 is not limited to the cast-in, but may be formed by forming a space in the pump body 20, and may be appropriately set in practice. I just need.

Also, other parts of the pump body 20, the injection plunger
The type of each part such as the injection cylinder 40 and the injection cylinder 43, and the type of the entire injection pump 10 are also arbitrary. The present invention can be applied to an injection pump for a hot chamber type die casting machine.

〔The invention's effect〕

As described above, according to the present invention, the injection sleeve can be held by utilizing the internal injection pressure by making the injection sleeve a bottomed cylindrical shape and connecting the gooseneck portion to the side surface, Since the molten metal can be reliably sealed and the injection sleeve can be pressed and fixed by the pressing means having a simple structure, the structure of the injection section can be simplified, and the size and weight of the entire injection pump can be reduced. The simplification of the structure around the injection sleeve makes it possible to reduce the size and weight.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1, showing a main part of the embodiment, FIG. FIG. 4 shows the conventional example, and FIG.
FIG. 4 is a sectional view taken along line IV. 10 ... Injection pump, 20 ... Pump body, 24 ... Gooseneck, 31 ... Injection sleeve, 35 ... Hot water outlet.

Claims (1)

(57) [Claims] An injection pump having a pump body provided with a corrosion-resistant injection sleeve embedded in and axially inside the pump body and a gooseneck portion for injecting molten metal from a heat-retaining furnace into a mold device of a die casting machine. The injection sleeve for a hot chamber type die casting machine, wherein the outer circumference of the injection sleeve is fixedly fastened by fastening means and pressed and fixed to the pump body by pressing means. The gooseneck portion is connected and communicated with a hot water outlet on the side surface, and the injection sleeve is pressed and fixed by pressing means via the tightening means, and the pressing means has a lower end face abutting on an upper end face of the tightening means. Cylindrical pressing member, and the pressing member is attached to the pump body via a compression spring. An injection pump for a hot chamber type die casting machine, comprising: an adjusting screw.