JPS62121017A - High-pressure casting machine - Google Patents

Abstract

PURPOSE:To improve agitation efficiency by eliminating waste of a solvent and raw materials and to prevent scattering of the raw materials at the time of casting, by a method wherein after the raw materials have been agitated once by colliding with them and a high-pressure casting head they are agitated further by a rotor. CONSTITUTION:When a cleaning shaft 20 is moved left by facing toward a drawing by moving a piston 19 in the inside of a hydraulic cylinder 18 by changing over a hydraulic directional control valve 31, an air space 32 appears in a raw material colliding and agitating chamber 19 posterior to movement of the cleaning shaft 20, spaces among raw material spouting nozzles 16A, 16B and raw material discharge holes 17A, 17B are closed by the cleaning shaft 20 and respective raw materials are spouted through the raw material spouting nozzles 16A, 16B under high pressure and at high speed. The raw materials are involved in a groove 12 of a high-speed rotor 24 rotating at high speed after they have come into collision with each other and agitated within the raw material colliding and agitating clamber 15, agitation of the raw materials advances further while the raw materials are being sent downward, and the raw material are discharged through a raw material discharge port 33.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention involves measuring two or more liquid raw materials, such as polyol and polyisocyanate, in constant amounts, pressurizing each of them to high pressure, and stirring them by causing them to collide with each other. This relates to the improvement of a so-called high-pressure casting machine that injects the stirred raw material into a mold.In particular, when injecting the raw material, the upper mold is left open and the mold is placed at multiple positions according to the internal shape of the mold. This invention relates to improvements to a casting machine that is especially effective when used for oven casting, which injects raw materials into the mold.

(Prior Art) Conventionally, so-called low-pressure casting machines have been widely used for the above-mentioned open casting. The low-pressure casting machine is characterized by utilizing a casting head 1 having a stirring chamber 2 and a rotor 3, as shown in FIG. 3, for example.

This casting machine injects fixed amounts of different raw materials into a stirring chamber 2 through raw material inlets 4A and 4B of a casting head 1, respectively, and rotates a rotor 3 with a motor 5 to mix two types of raw materials. The stirred raw material is stirred by the action of the rotor and discharged from the raw material discharge port 6.

However, although this casting machine has an excellent feature of stirring the raw materials, if the casting machine is left as it is after the single casting machine is finished, the raw materials in the stirring chamber will react and solidify, causing problems such as the rotor 3 sticking. Usually, a solvent injection lower is provided, and the solvent is injected into the raw material stirring chamber 2 from the solvent injection lower, and the rotor 3 etc. are cleaned once every time the casting is completed, and the solvent remains in the raw material stirring chamber 2. The solvent must be blown away by injecting compressed air from the high-pressure air inlet 8, which results in a large waste of the solvent and raw materials adhering to the rotor 3 and the like.

In addition, as a measure to eliminate the need to wash the rotor with these solvents, the number of rotations of the rotor was increased from the usual 1,000 to 4. OOOR
PM degree to 20. A method was devised and tried in which the centrifugal force of the rotor was used to shake off the adhering raw materials at around OOORPM, but increasing the rotation speed actually lowered the raw material agitation efficiency, which was essential for the purpose of omitting solvents. good results could not be obtained.

Therefore, in recent years, attempts have been made to apply so-called high-pressure casting machines to open casting in order to overcome this drawback.

A high-pressure casting machine is mainly characterized by the use of a high-pressure casting head having a structure as shown in FIG.

In other words, each raw material is weighed between 50 kg/cj and 300 kg/cj.
The raw material is pressurized to a high pressure of 100 ml and injected into the stirring chamber 10 at high speed from the raw material injection nozzles 9A and 9B, causing both raw materials to collide with each other and agitated. After the casting is finished, the cleaning shaft 11 is lowered to scrape off the raw material remaining in the stirring chamber.

In this way, the above-mentioned high-pressure casting machine can eliminate the waste of raw material solvent that occurs in low-pressure casting machines, but compared to the above-mentioned low-pressure casting machines, it is difficult to obtain sufficient agitation, and low-pressure In order to obtain agitation equivalent to that of a casting machine, a considerably high pressure is required, which tends to cause problems such as wear of the high-pressure part and a decrease in measurement accuracy.Also, when the raw material viscosity is high, sufficient agitation is not possible. There are disadvantages that are difficult to obtain.

In particular, when high-pressure casting is used for open casting, the amount of raw material discharged per hour is often small, and in order to achieve practical raw material agitation, it is necessary to
In many cases, nearly double the discharge pressure is required.

In addition, since the high-pressure casting machine discharges the stirred raw material at high pressure, open casting has the disadvantage that the raw material tends to scatter when it is poured into the mold.

(Problems to be Solved by the Invention) The present invention focuses on the above-mentioned drawbacks, and provides a casting machine that eliminates waste of solvent and raw materials, has high stirring efficiency, and does not scatter raw materials during casting. The purpose is to provide.

(Means for solving the problem) The feature of the present invention for solving the above-mentioned problem is that two or more types of synthetic resin raw materials are each 50 kg/cm2 to 300 kg/cm2.
In a high-pressure casting machine that includes a pressurizing device that can pressurize to CD and a high-pressure casting head that internally collides and stirs raw materials pressurized to high pressure, the high-pressure casting head is a raw material collision stirring chamber. Consisting of two or more raw material injection nozzles opening into the raw material collision stirring chamber, a rotor chamber connected to the open end of the raw material collision stirring chamber, having a raw material discharge port at the bottom, and containing a high-speed rotor. It's in a high-pressure casting machine.

(Operation) That is, the operation of the high-pressure casting machine of the present invention is to inject different raw materials at high pressure and high speed from two or more systems of high-pressure raw material injection nozzles, and collide the raw materials with each other in the raw material collision stirring chamber. The raw material is stirred and further stirred by a high-speed rotor that rotates at high speed.The raw material is pushed out of the casting head by the rotational force of the high-speed rotor, and at this time, the raw material attached to the rotor is also shaken off by centrifugal force. It is something.

(Example) Specific examples of the present invention will be further described below. Figure 1 is an overall system diagram of the high-pressure casting machine of the present invention, and is numbered 13.
is a high-pressure casting head which is the main feature of the present invention. The structure of the high-pressure casting head 13 includes two raw material injection nozzles 16A and 16B that open to the raw material collision stirring chamber 15 in succession to raw material inlets 14A and 14B that open to the outside of the high-pressure cast head 13, and that are opposed to each other. It has a raw material injection nozzle 16A,
Raw material collision stirring chamber 1 is located near the hydraulic cylinder 18 side of 16B.
5 and a raw material discharge port 1 penetrating the outside of the high-pressure casting head 13.
7A and 17B are provided.

Reference numeral 18 in FIG. 1 is a hydraulic cylinder, and a long cylindrical cleaning shaft 20 is connected to a piston 19 of the hydraulic cylinder, and is inserted into the raw material collision stirring chamber 15 so as to be movable in a JW manner.

A raw material injection nozzle 1 is provided on the surface of the cleaning shaft 20.
At least the raw material injection nozzles 16A, 1 are provided in the axial direction at the portions corresponding to the raw material discharge ports 17A, 17B and the raw material injection nozzles 16A, 16B.
Grooves 21A and 21B, which are longer than the distance between 6B and the raw material discharge slot 17A and 117B, are provided in the longitudinal direction.

The open end of the raw material collision stirring chamber 15 is open-connected to a rotor chamber 22 having a raw material discharge port 33 at its lower part. Rotor chamber 2
2 includes a high-speed rotor 24 that can be rotated at high speed by an external motor 23 and has a single helical groove 12 cut on its surface.
has. Numbers 25A and 25B are raw material tanks. It is usually desirable to use a tank with a temperature control function in order to keep the properties of the raw materials constant. (The temperature control function is not shown) The raw material tanks 25A and 25B each contain different types of raw materials. Raw material tanks 25A, 25B
are connected to the suction ports of pressurizing devices 27A and 27B by pipes 26A and 26B from the bottom of each of them, respectively. The pressurizing devices 27A and 27B are capable of generating high pressure,
In addition, stability in the discharge amount is required, and specifically, a maxial piston pump, motor, etc. are often used. The discharge ports of the pressurizing devices 27A and 27B are further connected to pipes 28A and 28.
B indicates the raw material inlet 14A of the high-pressure casting head 13 mentioned above.
, 14B, respectively, and is also connected to the high pressure casting head 13.
The raw material discharge ports 17A, 17B are the return pipes 29A, 2
It is connected to raw material tanks 25A and 25B by 9B. Reference numeral 30 denotes a hydraulic unit, which is connected via a hydraulic switching valve 31 to the hydraulic cylinder 18 of the high-pressure casting head 13 through piping. In the normal state of the high-pressure casting machine, that is, in the discharge preparation stage, the positions of the hydraulic switching valve 31, the hydraulic cylinder of the high-pressure casting machine, and the cleaning shaft 20 are as shown in FIG. 1, and the raw material is in the pressurizing device 27A. , 5 each by 27B
Pressurized to 0kg/- to 300kg/cffl from tanks 25A and 25B to piping 26A and 26B pressurizing device 27A
, 27B1 piping 28A, 28B raw material inlet 14A, 14
B, raw material injection nozzles 16A, 16B, grooves 21A, 21B on the surface of cleaning shaft 20, raw material outlet 17A,
Tank 25 via 17B return piping 29A, 29B
Return to A and 25B and cycle. At this time, the raw material injection nozzles 16A, 16B are
The raw materials in between are pressurized to high pressure.

Furthermore, the high-speed rotor 24 is constantly rotating.

The state of the high-pressure casting head when discharging raw materials is as shown in FIG.

That is, by switching the hydraulic switching valve 31 from the state shown in FIG. 1, the piston 19 in the hydraulic cylinder 18 is moved,
When the cleaning shaft 20 is moved to the left in the drawing, a gap 32 appears in the raw material collision stirring chamber 15 after the cleaning shaft 20 has been moved, and the space between the raw material injection nozzles 16A, 16B and the raw material discharge holes 17A, 17B is cleaned. Closed by the shaft 20, the raw material jetting nozzle 16
The respective raw materials are ejected from A and 16B at high speed under high pressure, collide with each other in the raw material collision stirring chamber 15, and are stirred, after which they are caught in the grooves 12 of the high speed rotor 24 that rotates at high speed.
While the raw material is being sent to the lower side of FIG. 2, stirring of the raw material further progresses, and the raw material is discharged from the raw material discharge port 33.

After completing the first step of raw material pouring, press the hydraulic switching valve 3 in Fig. 1 again.
1 is switched and the hydraulic cylinder 18 of the high pressure casting head 13
The cleaning shaft 20 and the piston 19 of the second
It moves to the right side of the figure, that is, to the state shown in FIG. 1, and at that time, scrapes off the raw material remaining in the raw material collision and stirring chamber 15. In addition, the raw material adhering to the high-speed rotor 24 is discharged from the discharge J3 by centrifugal flow generated by the rotation of the high-speed rotor 24 to an extent that does not pose a practical problem.

The high-pressure casting machine of the above-described embodiment was provided with a switching mechanism for discharging and circulating the raw material in the high-pressure casting head in accordance with the usual example, and also provided with an external circulation circuit, but the essential features of the present invention are these. Therefore, the mechanism in which the groove is provided in the cleaning shaft of the above-mentioned embodiment and the groove is moved together with the cleaning shaft to switch is merely a typical example, and the mechanism of the present embodiment In addition, a mechanism completely independent from the cleaning shaft may be provided.

Further, the cleaning shaft can also be omitted by providing the raw material injection nozzle at a position very close to the high-speed rotor or by providing it so as to spray the raw material directly onto the high-speed rotor. In this embodiment, the high-speed rotor is 1
The number of grooves, depth, etc. of the grooves are determined by the relationships such as the raw material discharge rate, viscosity, etc., and depending on these conditions, the rotor of the propeller strip can pass through. There are cases where

(Effects) As mentioned above, the high-pressure casting machine of the present invention has a high-pressure casting head that once collides the raw materials with each other and then stirs them further using a rotor, so that the high-pressure casting machine of the present invention has an effect that cannot be obtained with conventional high-pressure casting machines. ,
A high stirring rate can be obtained.

From a different perspective, it is possible to achieve the same agitation with a lower discharge pressure than conventional high-pressure casting machines, which has the effect of reducing wear caused by raw materials in the high-pressure parts and extending the life of pumps, etc. Dispensing accuracy has also been improved, making it possible to produce superior products compared to conventional high-pressure casting machines.

In addition, since raw materials adhering to the high-speed rotor can be shaken off by centrifugal force, it is possible to clean the rotor with solvent, which was impossible with conventional low-pressure casting machines, and improve the waste of raw materials associated with solvent cleaning. In addition to this, the material ejected under high pressure is temporarily stopped by a high-speed rotor, and the rotation of the high-speed rotor transports the material toward the discharge port. This has the effect of preventing the scattering of raw materials during casting, which was a major obstacle when applying this method.

[Brief explanation of drawings]

The first is an overall system diagram of the high-pressure casting machine of the present invention, FIG. 2 is a cross-sectional view of the high-pressure casting head during raw material discharge, and FIG. 3 is a cross-sectional view showing the general shape of the low-pressure casting head. FIG. 4 is a partial cross-sectional view of a general high-pressure casting head. 13... High pressure casting head 15... Raw material collision stirring chamber 16^/16B... Raw material injection nozzle 22... Rotor chamber 24... High speed rotor 27A/27B... Pressurizing device 33 ...Raw material discharge port patent applicant Mitsuboshi Belting Co., Ltd. 1! 2 Figure 4 Stone 4 Figure 3

Claims (1)

[Claims] One or more synthetic resin raw materials at 50 kg/cm each
In a high-pressure casting machine comprising a pressurizing device capable of pressurizing to 2 to 300 kg/cm^2 and a high-pressure casting head that internally collides and stirs the highly pressurized raw materials, the high-pressure casting head has a raw material collision stirring chamber, two or more raw material injection nozzles opening into the raw material collision stirring chamber, is connected to the open end of the raw material collision stirring chamber, has a raw material discharge port at the lower part, and includes a high-speed rotor. A high-pressure casting machine characterized by comprising a rotor chamber. 2. The high-pressure casting machine according to claim 1, which has a sliding cleaning shaft in the material collision stirring chamber of the high-pressure casting head. 3. The high-pressure casting machine according to claim 1 or 2, wherein the high-speed rotor is a cylinder having at least one spiral groove. 4. The high-pressure casting machine according to claim 1 or 2, wherein the high-speed rotor is a propeller.