JPH0114381Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a spray molding device that is highly productive, easy to maintain and maintain, and has good workability.

For example, as shown in FIG. 1, a conventional spray modeling apparatus is equipped with a large number of stirring blades at the bottom of a quantitative supply tank 01 that supplies and pumps a fixed amount of refractory powder (hereinafter referred to as foundry sand). A configuration is known in which a kneading machine 02 is provided, a booster 03 is attached to the tip of the kneading machine 02, and a blast hose 04 is connected to the booster 03. At this time, a certain amount of foundry sand is supplied from the hopper 05 to the fixed quantity supply tank 01 via the gate 06.
After supplying the sand to the kneader 02, the gate 06 is closed, and the tank 01 is pressurized with compressed air introduced from the air hole 07, and the foundry sand in the tank 01 is fed to the kneader 02. After kneading the hardening material and the caking material, the compressed air jetted from the booster 03 is sprayed onto the model surface (not shown) via the blast hose 04.

In this way, in conventional spray molding equipment, since the gate 06 is closed during operation, molding sand cannot be supplied during this time, and the machine is forced to operate intermittently, with one batch containing the fixed amount in the tank 01.
It has the disadvantage of low productivity, and the kneading machine 02
Another drawback was that maintenance and maintenance work was complicated and workability was poor.

The present invention has been made in order to eliminate such drawbacks and to provide a blow molding apparatus which has high productivity, and which is easy to maintain and maintain the kneading machine and has good workability.

In other words, the present invention comprises a storage tank for pumping a certain amount of foundry sand, a kneader placed at the bottom of the storage tank, a booster attached to the tip of the kneader, and a conveying conduit connected to the booster. The storage tank is divided into a plurality of tanks via partition walls, and each tank has a compressed air injection port as a means for pumping a certain amount of the refractory powder, and above and below each tank there is a refractory air outlet. The kneading trough of the kneading machine is equipped with a supply tube and a discharge tube for powder and granular material, and an opening/closing gate to which a flexible sheet is attached to keep the openings of these tubes airtight, and the kneading trough of the above-mentioned kneading machine is equipped with at least a final binder addition tube. This invention relates to a spray molding device that can be divided on the upstream side of the mouth.

FIG. 2 is a partially longitudinal front view showing an embodiment of the device of the present invention.

In Figure 2, 1 stores a certain amount of foundry sand;
This is a storage tank for pressure feeding, and the storage tank 1 is divided into two tanks 1a and 1b via a partition wall 2 in the center. Since these storage tanks 1a and 1b have the same configuration, only the configuration of the storage tank 1a will be described below.

A supply cylinder 4 communicating with a supply chute 3 is provided in the upper part of the storage tank 1a, and a lower end opening of the supply cylinder 4 formed in an oblique shape is connected to a pin 7 at the tip of a piston rod 6 of a fluid pressure cylinder 5. It can be opened and closed by an opening/closing gate 8 fixed through the opening/closing gate 8, and a flexible sheet 9 is attached to the opening/closing gate 8 for airtightly sealing the lower end opening of the supply cylinder 4. There is.

The lower portion of the storage tank 1 is formed into a funnel shape with a horizontal cross-sectional area that gradually decreases, and a discharge tube 10 having a smaller diameter than the supply tube 4 is provided at the lower end thereof. The lower end opening of the discharge tube 10, which is formed in an oblique shape, also has an opening/closing gate 14 fixed to the tip of the piston rod 12 of the fluid pressure cylinder 11 via a pin 13.
The opening/closing gate 14 is also provided with a flexible sheet 15 for airtightly sealing the opening at the lower end of the discharge tube 10.

Further, the storage tanks 1a, 1b are provided with a compressed air injection port 16 for pumping the foundry sand, and the lower portions of the storage tanks 1a, 1b are connected to a feeding cylinder 17.

Reference numeral 18 denotes a kneading machine which is supported by a pedestal 19 extending in a substantially horizontal direction. One end is connected to a rotary drive source 24 such as an electric motor through a coupling 23, and the kneading shaft 20 is equipped with a large number of kneading blades 2.
5 is removably attached.

The kneading trough of the kneader 18 consists of a cylindrical portion 26 and a conical portion 27 following the cylindrical portion 26.
An inlet 28 communicating with the above-mentioned feed cylinder 17, a first binder (e.g. hardening agent) inlet 29, and a second or final binder (e.g. caking agent) inlet 30 are bored therein, and The cylindrical portion 26 is connected to the connecting flange 3 upstream of the second or final binder inlet 30.
The cylindrical portion 26 and the conical portion 27 can be separated from each other at a connecting flange 3.
It can be divided into two parts.

Further, the end plate 33 of the kneading trough is provided with compressed air injection holes 3 for feeding compressed air into the kneading trough.

35 is a booster connected to the conical part 27 via the connecting flange 37 on the discharge port 36 side of the kneading trough, and the booster 35 is connected to the tongue-like member 38 interposed in the connecting flange 37 and the conical part 27.
An annular slit 40 is formed by a diagonal member 39 whose vertical cross-sectional area gradually decreases following the drawn line of the inner wall of the diagonal member 39, and the compressed air supply channel 41 formed on the peripheral wall of the diagonal member 39 is connected to the slit 40. Compressed air is supplied from a compressed air supply port 42 which is in communication with the compressed air supply port 42 .

Reference numeral 43 denotes a conveying conduit connected to the booster 35, which is made of a flexible conduit such as a blast hose.

The molding operation of the device of the present invention constructed as described above is performed in the following manner.

The lower opening/closing gate 14 of the storage tank 1a is closed, the upper opening/closing gate 8 is opened, and molding sand is supplied to the tank 1a via the supply chute 3 and the supply cylinder 4. Storage tank 1
When a certain amount of molding sand is supplied into tank 1a, the upper opening/closing gate 8 is closed, the lower opening/closing gate 14 is opened, and compressed air is supplied from the compressed air injection hole 16 to pressurize the inside of the tank 1a and mold the casting. The sand is forced into the kneader 18 from the feed cylinder 17.

In the kneader 18, the kneading blades 25 are rotated by a rotary drive source 24, and the foundry sand is stirred and kneaded with the hardening material injected from the injection port 29, and the caking material injected from the injection port 30. The mixture is stirred and kneaded. At this time, the foundry sand is fluidized by the compressed air injected from the compressed air injection hole 34 and is prevented from adhering to the inner wall of the kneading trough.

The molding sand kneaded in this way is discharged from the discharge port 3.
6, at which point it is accelerated by compressed air injected from the slit 40 of the booster 35, and is blown onto the model surface (not shown) through the conveying conduit 43, thereby performing a spray molding operation.

While the foundry sand is being pumped into the kneader 18 from the tank 1a as described above, a certain amount of foundry sand is supplied to the tank 1b. When the molding sand is completely pumped from the tank 1a, the molding sand is also pumped from the tank 1b, and in this way, the molding sand is continuously supplied.

In addition, when replacing the kneading blades 25 due to wear, etc., this work can be facilitated by disconnecting the connecting flange 31 of the cylindrical part 26 of the kneading trough and the connecting flange 32 of the cylindrical part 26 and the conical part 27. can be done.

Furthermore, in the device of the present invention, the adhesion of the foundry sand to the inner wall surface of the kneading trough is suppressed by the compressed air injected from the compressed air injection hole 34;
Depending on the type of binder, it may be difficult to completely prevent adhesion, and for this reason the cylindrical part 26 of the kneading trough is connected to the second or final binder inlet 3.
The cylindrical portion 26 of the injection port 30, where adhesion is likely to occur, can be easily removed, and cleaning work can be easily performed.

The effects of the device of the present invention detailed above can be summarized as follows.

(1) Continuous supply of molding sand becomes possible, improving productivity.

(2) Maintenance and maintenance of the kneading machine is simple and has high workability.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a conventional spray molding apparatus, and FIG. 2 is a partially vertical front view showing an embodiment of the apparatus of the present invention. 1, 1a, 1b... Storage tank for pumping a certain amount of refractory powder, 2... Partition wall, 8, 14... Opening/closing gate, 9, 15... Flexible sheet for airtight maintenance.
18...Kneading machine, 30...Final binder injection port, 3
1... Connection flange installed in the divided part of the kneading trough of the kneading machine, 35... Booster, 43...
...conveyance conduit.

Claims (1)

[Scope of utility model registration request] A storage tank that pumps a certain amount of refractory powder and granules, a kneader placed at the bottom of the storage tank, a booster attached to the tip of the kneader, and a conveying conduit connected to the booster. The storage tank is divided into a plurality of tanks via partition walls, each tank is equipped with a compressed air injection port as a means for pumping a certain amount of the refractory powder, and the refractory powder is placed above and below each tank. A supply cylinder and a discharge cylinder for powder and granular materials, and an opening/closing gate to which a flexible sheet is attached to keep the openings of these cylinders airtight are provided, and the kneading trough of the kneading machine is equipped with a supply cylinder and a discharge cylinder for powder and granular material, and the kneading trough of the kneading machine is equipped with a supply cylinder and a discharge cylinder for powder and granular material, and an opening/closing gate to which a flexible sheet is attached to keep the openings of these cylinders airtight. A spray molding device characterized by being able to be divided on the upstream side of the mouth.