JP2585004B2 - Automatic cleaning device in continuous kneader - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention introduces molding sand from the rear end of a trough and simultaneously adds a certain amount of a plurality of types of additives in a predetermined amount toward the front of the trough. In a continuous kneader that continuously discharges self-hardening kneaded molding sand having uniform properties from the tip of the trough by high-speed kneading with a rotating shaft on which kneading blades are mounted,
Among the kneading blades, in which the rotating shaft is hollow, and a large number of shafts are attached,
An air nozzle is attached to the rotating shaft in close proximity to each kneading blade from the primary addition port to the discharge port at the tip, and air is ejected from the air nozzle for several seconds to several tens of seconds every time kneading is completed. The present invention relates to an automatic cleaning device in a continuous kneader that removes a gap between an inner peripheral surface of a trough and a tip of a kneading blade and residual molding sand adhering to the kneading blade and discharges the sand from an outlet.

[Conventional technology]

At present, in a foundry, a certain amount of organic or additive is added to mixed sand of silica sand and special sand such as chromite sand or zircon sand, and the mixture is continuously kneaded. A rotary shaft having a kneading feed blade spirally mounted in a cylindrical trough over its entire length is rotatably provided, and casting sand is injected from the rear end of the trough and several types of additives are provided in the middle. While adding a certain amount of additive sequentially from the addition port, kneading the molding sand uniformly by a kneading machine that discharges the kneading molding sand from the discharge port at the tip of the trough while kneading at high speed by rotating the kneading feed blade. Is common. Thus, in such a kneading machine, after the kneading is completed, the kneading molding sand adheres to the gap between the inner peripheral surface of the trough and the kneading feed blade and to the tip of the kneading feed blade, and this hardens and grows, and the performance of the kneading machine In order to obstruct the cleaning, they are periodically removed and cleaned manually.

[Problems to be solved by the invention]

However, the kneading foundry sand remaining and adhering in the trough naturally hardens over time due to its self-hardening and adheres and grows more firmly, so it must be cleaned each time the kneading operation is completed, and For this cleaning, hands are inserted through a cleaning opening that is elongated on the peripheral side of the trough to remove the kneaded molding sand adhering to the back of each of the many kneading feed blades, and furthermore, the inner peripheral surface of the entire length of the trough. In order to separate and remove the kneaded foundry sand which is also adhered to a small area, it takes a considerable amount of time and effort since it is a narrow place, and there is a danger in case of unexpected rotation of the rotating shaft.

[Means to solve the problem]

The present invention has been made in view of such circumstances,
The rotating shaft is hollow and the mixing shaft is attached to the rotating shaft so as to prevent adhesion and growth of the kneaded molding sand in the trough and eliminate manual cleaning work. An air nozzle is attached near each kneading blade to the discharge port at the tip, and air is blown out from the air nozzle for several seconds to several tens of seconds each time kneading is completed, so that the inner peripheral surface of the trough and the kneading blade Blow off the gap between the tip and the kneading blade, especially the residual molding sand adhering to the back,
Since it is designed to be discharged from the discharge port, there is no need for manual cleaning work at the end of the kneading work, and it is possible to concentrate on the molding work of the mold filled with kneaded molding sand and dramatically improve the work efficiency It is.

(Operation)

The rotary shaft according to the present invention reduces the manufacturing cost.
Using a pipe, a large number of kneading blades are axially mounted in a spiral shape over the entire length, and an air nozzle attached near the kneading blades is firstly added from a casting sand inlet at the rear end of the trough. Since there is no additive added to the mouth, the molding sand does not harden, so there is no need to attach it, and it is attached from the addition port of this primary additive to the discharge port at the tip. In addition, if the air nozzle is sprayed in a fan shape and the air nozzle is installed obliquely to the axis of rotation, the residual molding sand separated and removed from the inner peripheral surface of the trough will be blown off toward the discharge port sequentially It is automatically discharged from the discharge port and automatically cleaned.

〔Example〕

According to one embodiment of the present invention, molding sand is introduced from a molding sand inlet (2) at the rear end of a horizontally long tubular trough (1), and a plurality of types of additive are added to the front of the trough (1). Self-hardening kneaded casting having uniform properties from the discharge port (3) at the tip of the trough (1) by kneading by high-speed rotation of a rotating shaft on which a large number of kneading blades are attached while adding a fixed amount of a stepwise agent. In a continuous kneader (4) for continuously discharging sand, the rotary shaft (5) has a hollow air introduction path (6),
Kneading blades (7) (7 ') axially mounted on the rotating shaft (5)
(7 ″)... Among the kneading blades (7) from the addition port (8) of the primary additive to the discharge port (3) at the tip of the trough.
(7 ') (7 ") ... Air nozzle (9)
(9 ') (9 ") ..., and the air introduction joint (10) is continuously attached to the tip of the rotating shaft (5). (12) is a secondary addition port, (13) is a casting sand introduction gate, (14) is a motor, and (15) is an operation handle.

〔The invention's effect〕

The present invention is configured as described above. If compressed air is sent by a solenoid valve every time kneading is completed, the compressed air is supplied from the air introduction joint (10) to the air in the rotating shaft (5). A large number of air nozzles (9) (9 ') (9 ") attached to the rotating shaft (5) via the introduction path (6) are simultaneously sprayed for several seconds to several tens of seconds. )
(9 ') (9 ") ... are all kneading blades (7) (7')
(7 ") ..., the compressed air blows off the residual molding sand (11) adhering to the kneading blades (7), (7 '), (7"), and the tip and the trough (1). )), The residual molding sand (11) adhering to the gap between the inner peripheral surface and the inner peripheral surface is also peeled off, blown away and removed and discharged from the discharge port (3) for automatic cleaning. It is possible to concentrate on molding work without having to spend time cleaning the inside of a narrow trough, improving work efficiency, and maintaining the performance of the kneading machine for a long time with a simple configuration, (7) (7 ') (7 ")... Exhibit many advantages such as extending the life of consumables.

[Brief description of the drawings]

FIG. 1 is an enlarged view of a main part according to the present invention, and FIG.
FIG. 3 is a partially cut-away side view of the continuous kneader according to the present invention. In the figure, (1) ... trough, (2) ... casting sand inlet (3) ... outlet, (5) ... rotating shaft, (6) ... air inlet path (7) (7 ') (7 ″) kneading blade, (8) first
Next addition port (9) (9 ') (9 ") ... air nozzle, (10) ... air introduction joint

Claims (1)

(57) [Claims] 1. A molding sand is introduced from the rear end of the trough, and a plurality of additives are added stepwise toward the front of the trough while kneading with a rotating shaft on which a kneading blade is mounted. In a continuous kneader that discharges more kneaded molding sand, the rotary shaft is made hollow, and each of the kneading blades that are axially attached to the rotary shaft from the first addition port to the discharge port at the tip of the trough. An automatic cleaning device in a continuous kneader, wherein an air nozzle is attached near a blade, and an air introducing joint is connected to a tip of a rotating shaft.