JP2528641Y2 - Injection pump for hot chamber die casting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] 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 an injection sleeve is fitted into a pump body.

(Background technology)

2. Description of the Related Art Conventionally, in a die casting, a hot chamber type has been frequently used as a pump for injecting a molten metal into a die.

As such a hot chamber type injection pump, a teapot type having a gooseneck is used (see Japanese Utility Model Application No. 62-169650).

In FIG. 5, the injection pump 50 has a holding furnace 51 for storing a molten metal, and an injection sleeve 52 is disposed inside the furnace 51. The tip of the injection sleeve 52 penetrates the bottom surface of the holding furnace 51 and is connected to a bent tubular gooseneck 53, and is in pressure communication with a mold 55 via a nozzle 54 at the tip. On the other hand, the molten metal in the holding furnace 51 is introduced into the injection sleeve 52 through holes, grooves, and the like, and the plunger 57 is driven forward and backward by the upper injection cylinder 56, so that the molten metal is pumped to the mold 55 through the gooseneck 53 and the nozzle 54. Injected.

Here, in the injection pump 50, the mold 55 in the nozzle 54
A sufficient pressure contact force (nozzle touch thrust) is required to maintain the pressure contact seal with the nozzle, and there is a problem that the head of the gooseneck 53 is bent by the nozzle touch thrust. For this purpose, a back stopper mechanism 59 or the like is provided between the head of the gooseneck 53 and the frame 58 supporting the injection pump 50, and the gooseneck 53 is bent by receiving the nozzle touch thrust by the frame 58 via this mechanism 59. And so on.

In such an injection pump 50, a ceramic material is used for the injection sleeve and the like in consideration of corrosion resistance to molten aluminum or the like. However, the teapot type described above has a problem in that the structural accuracy is insufficient, there is a risk of breakage and the like, and it is difficult to obtain a high injection pressure. On the other hand, an injection pump has been developed in which an injection sleeve or the like is fitted into a block-shaped pump body and tightened and fixed (Japanese Patent Application No. 63-21768).
No. 9).

6 and 7, the injection pump 60 has a block-shaped pump main body 61 in the frame of a gate-shaped frame 70.

The pump body 61 has a concave portion 61A on the upper surface side, and a goose neck portion in which a pipe material is previously buried by casting or fitting.
It has 62. The base end of the gooseneck 62 is a recess 61A
The front end is opened at the side surface of the upper protruding portion of the main body 61, and a nozzle 63 is attached to the opening. A double tightening sleeve 64 that fits in a taper is fitted into the bottom of the concave portion 61A, and an injection sleeve 65 is fitted in the 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. In the hot water pool 68 formed in these gaps, a supply pipe 69A is supplied from a side molten metal holding furnace 69.
The molten metal is appropriately introduced into the injection sleeve 65 through the hole of the first pressing sleeve 66. Injection plunger 65A inside injection sleeve 65 from above
Is inserted, and the plunger 65A is reciprocated by an injection cylinder 65B installed on the upper portion of the frame 70, whereby the molten metal in the injection sleeve 65 is fed to the gooseneck portion 62 and injected from the nozzle 63.

A lower pressing plate 71 and an upper pressing plate 72 are arranged above and below the pump body 61, and are connected by a plurality of tie rods 73. The tie rod 73 and the lower pressing plate 71 are fixed, but the tie rod 73 and the upper pressing plate 72 are movably inserted. A coil spring 74, which is an elastic pressing member, is interposed between the upper end of the tie rod 73 and the upper surface of the upper pressing plate 72, and the upper and lower pressing plates 71, 72 are urged toward each other. Here, the lower pressing plate 71 has an upper surface abutting against the bottom surface of the pump body 61, and the upper pressing plate 72 has a lower surface engaged with the upper end of the first pressing sleeve 66, and is screwed forward and backward freely. It is in contact with the upper end of the second pressing sleeve 67 via the bolt 75. Therefore, the pump body 61 and each sleeve 64 to
67 is elastically sandwiched and integrated by upper and lower pressing plates 71 and 72, and the injection sleeve 65 is tightened in the axial direction via the first pressing sleeve 66. To withstand the internal high pressure.

Further, in order to support the pump body 61 on the frame 70, the lower pressing plate 71 is placed and fixed on the bottom of the frame 70,
The upper pressing plate 72 is bridged over the shoulder of the frame 70.
A thrust receiving key 76 is fitted and interposed between the upper pressing plate 72 and the frame 70, and an adjustment piece 77 is interposed between the upper pressing plate 72 and the back side of the nozzle 63 of the pump body 61. The pump 70 is configured to receive a nozzle touch thrust from the pump body 61 via the upper pressing plate 72 at the frame 70 when the nozzle 63 is connected to a mold or the like. The relative position between the pump body 61 and the upper pressing plate 72 is defined by adjusting the adjustment piece 77, whereby the injection sleeve 65 and the plunger 65A or the injection cylinder 65B are aligned.

In such an injection pump 60, each of the sleeves 64 to
By using a ceramic material for the 67 and the gooseneck 62, sufficient corrosion resistance to molten aluminum is obtained, and the sleeves 64 to 67 and the gooseneck 62 are integrally installed in the block-shaped pump body 61. Sufficient rigidity and structural accuracy can be ensured. In particular, it is possible to withstand high injection pressure by elastically sandwiching each of the sleeves 64 to 67 and the pump body 61, and to release the nozzle touch thrust to the frame 70 by the thrust receiving key 76 and the adjustment piece 77, thereby making the pump body 61 It is possible to reduce a decrease in accuracy of the shaft center in the injection sleeve 65 or the injection cylinder 65B due to the distortion.

On the other hand, the following injection pump has also been developed as a pump using a block-shaped pump body (Japanese Patent Application No. Hei.
247534).

8 and 9, the injection pump 80 has the same basic structure as the above-described injection pump 60, and includes a similar portal frame 70 and a block-shaped pump main body 61. The structure that elastically holds 61 is different.

That is, a lower pressing plate 81 and an upper pressing plate 82 are arranged above and below the pump main body 61, and are fixed to upper and lower ends of a plurality of tie rods 83 connecting these. A cylindrical guide 84 that projects downward and is fixed to the lower pressing plate 81, and a pressing force adjusting bolt 85 is screwed through the bottom surface thereof,
A spring guide 86, a plurality of disc-shaped springs 87, and a spring receiver 88 are inserted therein, and the spring receiver 88 is in contact with the bottom surface of the pump body 61. Accordingly, the pump body 61 is urged in a direction away from the lower pressing plate 81 by the compression reaction force of the disc-shaped spring 87 set by the pressing force adjusting bolt 85, and each of the sleeves 64 to 67 is pressed between the pump main body 61 and the upper pressing plate 82. Elastically clamped together. Note that the lower pressing plate 81 is not in contact with the frame 70, and the pump body 61 is supported by an upper pressing plate 82 that is suspended over the shoulder of the frame 70.

In such an injection pump 80, the same effects as those of the injection pump 60 described above can be obtained, and the upper and lower pressing plates 81, 8
2 is fixed by the tie rod 83, and the pressing force for elastic holding by the disc-shaped spring 87 is set on the axis of the injection sleeve 65, so that misalignment or the like hardly occurs and rigidity and accuracy can be further improved.

[Problems to be solved by the invention]

In the injection pump 60 or the injection pump 80 described above, the adjustment piece 77 receives the nozzle touch thrust from the pump body 61 to the upper pressing plate 72, respectively.

However, in each case, by adjusting the thickness of the adjustment piece 77 and changing the relative position between the pump body 61 and the upper pressing plate 72, the injection sleeve 65 and the injection cylinder 65B or the plunger 65A are aligned. It has become. For this reason, the axis accuracy of the injection sleeve 65 and the injection cylinder 65B or the plunger 65A is adjusted by the adjustment piece 77, so that the centering work is difficult, and the shaft axis once aligned is likely to be misaligned with use. There is a problem.

Further, a space is required between the back side of the nozzle 63 of the pump main body 61 and the upper pressing plate 72 in order to interpose the adjusting piece 77, and the rising portion of the gooseneck portion 62 is inclined so that the upper nozzle 63 side protrudes. Therefore, there is a problem in that it is unavoidable to avoid structural complexity such as complicated manufacturing such as installation of a core at the time of casting and an increase in the thickness between the recess 61A.

Furthermore, the nozzle of the gooseneck part 62 through the adjustment piece 77
The heat in the vicinity of 63 is released to the upper pressing plate 72, so that the molten metal is solidified inside the gooseneck portion 62, and there is a problem that the injection operation is likely to be hindered.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an injection pump for a hot-chamber die-casting machine that can reliably receive a nozzle touch thrust and perform alignment or injection operation with a simple structure.

[Means for solving the problem]

The present invention relates to the injection pump 60 or the injection pump 80 described above.
In the injection pump having the basic structure, the second pressing sleeve is fitted around the outer periphery of the pool, the upper end thereof is fitted into the upper pressing plate, and the upper pressing plate and the pump body are opposed to each other along the nozzle touch thrust. Provided with an engagement structure for receiving a thrust.

Here, the upper surface of the pump main body, the upper pressing plate surface, and the like can be adopted as the opposing surfaces of the upper pressing plate and the pump main body along the nozzle touch thrust.

Further, as the engagement structure for receiving the thrust, a structure in which a groove is provided on each surface to prevent the displacement by interposing an engagement key or the like can be adopted.

[Action]

In the present invention, the injection sleeve and the injection cylinder are aligned with each other by fitting the second pressing sleeve and the upper pressing plate, and the nozzle touch is formed by the engagement structure between the upper pressing plate and the pump body. Thrust reception is performed.

For this reason, in the conventional injection pumps 60, 80, etc., the function of receiving the nozzle touch thrust and the function of centering the injection sleeve, which are also used by the adjustment piece 77, can be performed independently.
As a result, the alignment can be easily adjusted, and since the alignment is performed by fitting, the accuracy is improved and a change with time is eliminated.

In addition, since the adjusting piece 77 in the conventional injection pumps 60, 80 and the like is not required, escape of heat through the adjusting piece 77 is eliminated, thereby causing inconvenience such as solidification of the molten metal near the nozzle 63 of the gooseneck portion 62. Will be resolved.

Furthermore, since it is not necessary to secure a space for interposing the adjustment piece 77 between the back surface of the nozzle 63 and the upper pressing plate 72 as in the related art, it is possible to erect the rising portion of the gooseneck portion 62, As a result, complicated manufacturing and structural waste are eliminated.

In the present invention, the above object is achieved by the above.

〔Example〕

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

1 and 2 show a first embodiment of the present invention.

The injection pump 10 of this embodiment has basically the same configuration as the injection pump 60 of FIGS. 6 and 7 described above. Therefore, for the sake of simplicity, the same portions are denoted by the same reference numerals, and description thereof will be omitted. Only different portions will be described.

That is, in the pump main body 11, the upper end 17A of the second pressing sleeve 17 fitted into the concave portion 61A is extended, and fitted into the fitting portion 22A formed on the upper pressing plate 22. At this time, the upper end portion 17A and the fitting portion 22A are precisely coaxially arranged with respect to the position of the engaging axis of the first pressing sleeve 66 and the upper pressing plate 22, that is, the axis of the injection sleeve 65 or the injection cylinder 65B. ing.

Also, the gooseneck part 12 embedded in the pump body 11
In the figure, an intermediate rising portion 112A is arranged in a substantially vertical direction, and a predetermined space is provided between the projection on the back side of the nozzle 63 of the pump body 11 and the upper pressing plate 22.

Further, the upper surface of the pump body 11 and the lower surface of the upper pressing plate 22 are opposed to each other at a slight interval on a substantially axis of the nozzle 63, and each has a thrust receiving key 11B extending in a direction orthogonal to the axis of the nozzle 63. Fitted and interposed.

Here, when assembling the injection pump 10 of the present embodiment, the sleeves 64 to 65, 17 are fitted into the pump body 11 in which the gooseneck portion 12 is embedded in advance, and in this state, the upper and lower pressing plates 22, 71 are attached to the pump body 11. Elastically sandwiched by contacting the top and bottom of the At this time, the upper end 17A of the second pressing sleeve 17 and the fitting hole 22A of the upper pressing plate 22 are fitted. A thrust receiving key 11B is interposed between the upper surface of the pump body 11 and the lower surface of the upper pressing plate 22. Then, the upper and lower pressing plates 22, 71
At the same time, the pump body 11 is fixed to a predetermined position of the frame 70, and the injection cylinder 65B is installed above the frame 70, and the injection plunger 65A is fitted into the injection sleeve 65.

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

That is, by fitting the upper end portion 17A of the second pressing sleeve 17 with the fitting hole 22A of the upper pressing plate 22, the engagement portion of the upper pressing plate 22 coaxially arranged and the first pressing sleeve 66 or the injection sleeve 65 Is performed. And the frame
By fixing to 70, the upper pressing plate 22 and the injection cylinder 65B are centered. Therefore, the injection pump of the present embodiment
In 10, the alignment of the injection cylinder 65B, the injection plunger 65A, and the injection sleeve 65 can be automatically performed by fitting or the like accompanying assembly.

Therefore, compared to the case where manual adjustment is performed after assembly using the adjustment piece 77 as in the conventional injection pump 60, the injection cylinder
The centering operation of the injection cylinder 65 or the injection cylinder 65 can be performed easily and quickly.

Further, since the injection sleeve 65 or the injection cylinder 65B is securely connected by fitting, the shaft center accuracy obtained at the time of assembly can be maintained for a long period of time.

Further, it is possible to prevent a failure such as chipping of the injection plunger 65A due to displacement or inclination of the axis of the injection cylinder 65B or the injection sleeve 65, and to enhance reliability.

On the other hand, in the injection pump 10 of the present embodiment, the nozzle 63
Can be transmitted from the pump body 11 to the upper pressing plate 22 via the thrust receiving key 11B, and can be transmitted from the upper pressing plate 22 to the frame 70 via the thrust receiving key 76.

Therefore, there is no need to use the adjustment piece 77 as in the conventional injection pump 60, and various problems caused by the adjustment piece 77 can be solved.

In particular, the nozzle touch thrust receiving is performed independently of the above-described centering, and the influence on the axis center accuracy of the injection sleeve 65 and the like can be avoided.

Also, the back side of the nozzle 63 of the pump body 11 and the upper pressing plate
22 and is kept out of contact with each other to prevent heat from escaping from the pump body 11, etc.
Obstacles such as solidification of the molten metal in 12 can be prevented beforehand.

In addition, since the gooseneck portion 12 does not require a space for interposing the adjustment piece 77 as in the related art, the intermediate rising portion 12A can be arranged in a substantially vertical direction. And other operations can be simplified.

Further, since the gooseneck portion 12 is arranged along the concave portion 61A, useless space and the like can be eliminated, and the pump body 11 can be made compact.

In addition, since the sleeves 64 to 66 and 17 and the gooseneck portion 12 in the pump body 11 are of a fitting type, sufficient corrosion resistance to molten aluminum can be obtained by using a ceramic material. In addition, by installing the sleeves 64 to 66, 17 and the gooseneck portion 62 integrally in the block-shaped pump body 11, sufficient rigidity and structural accuracy can be secured. Furthermore, by elastically sandwiching each of the sleeves 64 to 66, 17 and the pump body 61, it is possible to withstand high injection pressure.

FIGS. 3 and 4 show a second embodiment of the present invention.

The injection pump 30 of this embodiment has basically the same configuration as the injection pump 80 of FIGS. 8 and 9 described above. Therefore, for the sake of simplicity, the same portions are denoted by the same reference numerals, and description thereof will be omitted. Only different portions will be described. In addition,
The difference between the injection pump 30 and the injection pump 80 of the present embodiment is substantially the same as the difference between the injection pump 10 and the injection pump 60 of the first embodiment.

That is, the upper end portion 17A of the second pressing sleeve 17 fitted into the pump body 11 is fitted into a fitting portion 32A formed on the upper pressing plate 32, and each of them is positioned with respect to the axis of the injection sleeve 65 or the injection cylinder 65B. And are exactly coaxially arranged.

Also, the gooseneck part 12 embedded in the pump body 11
The middle rising portion 12A is arranged in a substantially vertical direction, and a predetermined space is provided between the projection on the back side of the nozzle 63 of the pump body 11 and the upper pressing plate 32.

Further, the upper surface of the pump body 11 and the lower surface of the upper pressing plate 32 are opposed to each other at a slight interval on the substantial axis of the nozzle 63, and each has a thrust receiving key 11B extending in a direction orthogonal to the axis of the nozzle 63. Fitted and interposed.

In this embodiment, the second pressing sleeve 17 and the upper pressing plate are assembled in the same manner as in the first embodiment.
32 and the injection sleeve 65 and the like are aligned, and the thrust receiving key 11B performs the nozzle touch thrust receiving independently of the centering. Therefore, similarly to the first embodiment, the conventional adjustment piece 77 can be omitted, and the same effect as that of the first embodiment can be obtained.

The present invention is not limited to the above embodiments, but includes the following modifications.

For example, the engagement structure for receiving the thrust is not limited to the above-described thrust receiving key 11B, but the pump body 11 and the upper pressing plate 22,
An uneven shape that can be fitted to each other may be provided on the upper surface of 32 to directly engage with each other. Further, a structure may be employed in which the protrusion provided on one side is fitted in the groove of the opposing portion, and in other words, the structure is such that the nozzle touch thrust receiver can be performed independently of the centering of the injection sleeve 65. It is.

Further, each sleeve 64 to 66, 17 in each of the above embodiments.
The structure, combination, etc. of the injection pumps may be selected as appropriate for implementation, and the type of the injection cylinder 65B, the frame 70, etc. are also arbitrary. Applicable to

[Effect of the invention]

As described above, according to the present invention, the center is performed by fitting the upper pressing plate and the second pressing sleeve that elastically sandwich the pump body and the injection sleeve,
By performing the nozzle touch thrust receiving independently of the centering by the engagement structure between the pump body and the upper pressing plate,
With a simple structure, the nozzle touch thrust receiver and centering can be reliably performed, and therefore, the injection operation can be reliably performed by preventing a decrease in shaft center accuracy.

[Brief description of the drawings]

1 and 2 are sectional views showing a first embodiment of the present invention and sectional views taken along the line II-II in the same figure, and FIGS. 3 and 4 are sectional views showing a second embodiment of the present invention. Figure and IV in the figure
FIG. 5 is a cross-sectional view showing a conventional example,
6 and 7 are a cross-sectional view showing a conventional example corresponding to the first embodiment and a cross-sectional view showing a VII-VII cross section in FIG.
FIGS. 8 and 9 are a sectional view showing a conventional example corresponding to the second embodiment and a sectional view showing an IX-IX section in the same figure. 10, 30… Injection pump, 11… Pump body, 11B… Thrust receiving key with engagement structure, 12… Gooseneck part, 17…
… Second pressing sleeve, 22, 32… upper pressing plate, 65… injection sleeve, 66… first pressing sleeve, 68… pool, 7
1,81 …… Lower pressing plate, 73,83 …… Tie rod, 74,87 ……
A coil spring and a disc spring as elastic pressing means.

Claims (2)

(57) [Scope of request for utility model registration] 1. An injection pump for a hot chamber type die casting machine for injecting a molten metal into a mold, comprising: a block-shaped pump body having a tubular gooseneck portion extending from a nozzle on a side surface to a bottom portion of a water reservoir opening on an upper surface. The injection sleeve, which communicates with the gooseneck part, is inserted from above into the bottom of the basin and the first pressing sleeve is brought into contact with the upper end of the injection sleeve, and the upper pressing plate is brought into contact with the upper end of the first pressing sleeve. The lower pressing plate is brought into contact with the lower end of the pump body, the upper and lower pressing plates are connected by tie rods, and the upper and lower pressing plates or elastic pressing means for urging the respective pressing plates close to each other are interposed between the tie rods. The injection sleeve is integrated with the pump body by elastically holding the plate, and the second pressing sleeve is fitted around the outer periphery of the water pool, and the upper end is fitted into the upper pressing plate. Moni, upper pressing plate and an injection pump for hot-chamber die casting machine, characterized in that a engagement structure for receiving the thrust between the opposed surfaces along the nozzle touch thrust the pump body. 2. An injection pump for a hot chamber type die casting machine for injecting a molten metal into a mold, wherein a block-shaped pump main body is provided with a tubular gooseneck portion extending from a nozzle on a side surface to a bottom portion of a basin opening on an upper surface. The injection sleeve, which communicates with the gooseneck part, is inserted from above into the bottom of the basin and the first pressing sleeve is brought into contact with the upper end of the injection sleeve, and the upper pressing plate is brought into contact with the upper end of the first pressing sleeve. The lower pressing plate is brought into contact with the lower end of the pump body, the upper and lower pressing plates are connected by a tie rod, and elastic pressing means for urging the lower pressing plate and the pump body apart from each other is interposed. The injection sleeve and the pump body are integrated by elastic clamping, and the second pressing sleeve is fitted around the outer periphery of the basin, and the upper end is fitted into the upper pressing plate. Injection pump for hot-chamber die casting machine, characterized in that a engagement structure for receiving the thrust between the opposed surfaces along the nozzle touch thrust between the upper pressure plate and the pump body.