JP6630883B1 - Mixer for producing foundry sand - Google Patents

Abstract

An object of the present invention is to provide a mixer that can prevent leakage of a liquid additive for kneading from a trough by a simple structural reform and that can be easily decomposed as in the past. A mixer for producing molding sand, wherein a trough and a liner have a trough-like or semi-cylindrical configuration divided into two along the axial direction of the screw, and the semi-cylindrical liner has an outer shape. Attached to the housing in a state of being displaced by a required angle around the axis of the trough, whereby the phase of the split joint surface of the outer housing and the split joint surface of the liner are shifted from each other. I have. [Selection diagram] FIG.

Description

TECHNICAL FIELD The present invention relates to a mixer for producing foundry sand by kneading .

The production of molding sand means, for example, kneading of molding sand used for green mold and molding sand used for self-hardening molding sand.If it is self-hardening molding sand, there are organic and inorganic additives as additives. If organic, furan, alkali phenol, phenol urethane, phenolic acid curing agent, alkyd urethane, polyol urethane, etc., if inorganic, water glass, cement, etc. Calcium silicate, organic ester, ferrosilicon, alkali silicate, etc.In addition to self-hardening, there are also gas curing and heat curing, and since an accelerator and an additive are added for each binder, there will be many as specific examples . In the case of a green mold, a mixer is also used when adding water to the green mold sand.

As a mixer used for kneading such foundry sand, a type generally provided with a screw in a trough is generally used.For example, in the case of kneading self-hardening foundry sand, such a mixer is left as it is after kneading. It is necessary to clean the inside of the trough frequently, so the trough is configured to be disassembled, so that the trough can be divided into two along the axial direction of the screw. ing.

  The following techniques are known as conventional techniques of such a mixer.

59-166823 JP-A-11-151552 Patent 5718511

In the mixer described above, since the molding sand comes into pressure contact with the trough due to the rotation of the screw, wear is severe, as a countermeasure, arrange a liner inside and replace it with a new one if worn. Have been.
That is, the trough has a double structure.
Therefore, for disassembly of the trough and the liner described above, both are divided along the axial direction of the screw, that is, the cylindrical body is divided at 180 degrees in the axial direction. Is formed. Of course, the joining is performed precisely at the time of joining, but at the time of kneading , there is a problem that the liquid material of the additive often leaks outside from the joint.

  In order to solve the above problem, the present inventors have taken measures such as improving the accuracy of the joint between the troughs and the liner or improving various packings, but have not been successful.

The present invention has been made in view of the above situation, and it is possible to provide a mixer capable of preventing leakage of a kneading liquid additive and foundry sand from a trough by a simple structural reform, and which can be easily disassembled as before. The purpose is to.

In order to achieve the above object, the mixer for producing molding sand according to the present invention is provided with a rotatable screw for kneading molding sand in a cylindrical trough, and is added to the molding sand injected from one side. A mixer for producing molding sand by mixing , stirring and kneading materials, wherein the trough has a trough-like or semi-cylindrical configuration divided into two along the axial direction of the screw, and a base end thereof. In the above, the outer housing is configured to be openable and closable so as to rotate around an axis orthogonal to the axial direction of the screw and to expose the internal screw, and similarly provided detachably provided inside thereof. become a gutter-shaped or semi-cylindrical and a two divided liner, the trough-shaped or semi-cylindrical liner, attachment to the outer housing, the required angular component rotationally displaced about the axis of the trough Provided in a state, other than Te, and constitutes by shifting the phase of the split joint surface of the outer housing and dividing joint surface of the liner, in which took measures that.

ADVANTAGE OF THE INVENTION According to this invention, the mixer which can avoid a liquid leak while being easy to disassemble by forming a level | step difference in the circumferential direction by the extremely simple structure improvement which improves the division | segmentation of a trough and a liner is improved. It is now possible to provide.
Other advantages of the present invention will become apparent from the following description of embodiments.

In carrying out the present invention, it is preferable to take the following measures.
That is, it is preferable that the division surface of the liner is set at a rotation angle of 3 degrees to 6 degrees with respect to the division surface of the trough in the rotation direction of the screw.
In addition, a fixing bolt is protruded radially outward at a required position around each of the two divided liners, and a hole through which the fixing bolt passes is formed in the trough. It is preferable that a fixing bracket is provided on a peripheral portion of the hole, and the fixing bolt is detachably fixed to the fixing bracket via a nut.

The front view of the principal part of the mixer concerning this invention. The top view of the principal part of the mixer concerning this invention. The side view of the important section of the mixer concerning the present invention. The longitudinal section of the important section of the mixer concerning the present invention. FIG. 1 is a schematic external view of a main part of a trough of a mixer according to the present invention. FIG. 6 is a schematic view of the mixer according to the present invention, taken along the line cc in FIG.

Hereinafter, preferred embodiments of a mixer for producing molding sand according to the present invention will be described in detail with reference to the drawings.
As shown in FIGS. 1 to 6, the casting sand kneading, a variety of types of mixer used by the kneading of the molding sand at the outset, wherein, for a mixer used for kneading the self-hardening casting sand explain. A screw 2 for kneading molding sand is rotatably provided in a cylindrical trough 1 of the type described above, and an additive is mixed into molding sand fed from one side, and the mixture is stirred and kneaded to produce molding sand. The trough 1 has a trough-like or semi-cylindrical configuration divided into two along the axial direction of the screw 2. As shown in FIG. 4, the mixer has a large number of paddles 2A for stirring in a spiral state on the transfer direction side, and a screw 2B on the base end side.

In FIGS. 1 and 2, reference numeral 6 denotes an inlet for casting sand, 7 denotes an inlet for a hardener, 8 denotes an inlet for a resin, and 9 denotes an outlet on the tip side. At the base end of the trough 1, an outer housing 1 </ b> A that is configured to be openable and closable so as to rotate around an axis orthogonal to the axial direction of the screw 2 and expose the internal screw 2, A liner 1B which is detachably provided on the inside thereof and is divided into a similar trough-like or semi-cylindrical shape into two parts. The trough-like or semi-cylindrical liner 1B is attached to the outer housing 1A by the trough. 1 is pivotally displaced by a required angle, here, 5 degrees, so that the phases of the divided joint surface of the outer housing 1A and the divided joint surface of the liner 1B are shifted. It is composed.

  The division surface of the liner 1B is set at a rotation angle of 5 degrees with respect to the division surface of the trough 1 in the rotation direction of the screw 2. It is provided shifted in the rotation direction by a rotation angle of 5 degrees. Such a state of the phase shift is performed by the following mounting structure. That is, fixing bolts 3 are protruded outward in the radial direction at required positions on the periphery of each of the two divided liners 1B, and the fixing bolts 3 are provided on the housing 1A of the trough 1. A hole 4 through which a bolt is passed is drilled, and a fixing bracket 5 is provided around the hole 4. The fixing bolt 3 is detachably fixed to the fixing bracket 5 via a nut. I have.

  FIG. 5 is a schematic view of the outer appearance of the trough 1, but the liner 1 </ b> B shifts by 5 degrees in the circumferential direction toward the rotation direction of the screen 2 as indicated by the arrow in FIG. Thus, the joining portion of the housing 1A and the joining portion of the liner 1B can be shifted, and the path of the joining portion is not directly connected, so that the liquid material and molding sand inside do not leak easily. Of course, the deviation of the rotation angle is preferably 3 degrees to 6 degrees in terms of production, but may be set to an appropriate angle as long as the angle is within a range close to such an angle.

Industrial applications

INDUSTRIAL APPLICABILITY The present invention can be implemented by easily remodeling an existing mixer as a mixer used for kneading molding sand, so that the applicable range is wide.

1: Trough 1A: Housing 1B: Liner 2: Screw 3: Fixing bolt 4: Hole 5: Fixing bracket 6: Casting sand inlet 7: Hardener inlet 8: Resin inlet 9: Discharge outlet

Claims (3)

A mixer for kneading molding sand in a cylindrical trough is provided rotatably, mixing additives into the molding sand charged from one side, stirring, kneading to produce a molding sand,
The trough has a trough-like or semi-cylindrical configuration divided into two along the axial direction of the screw, and at a base end thereof, rotates around an axis orthogonal to the axial direction of the screw, and the internal screw And an inner housing that is configured to be freely openable and closable so as to be able to be exposed and an inner housing that is detachably provided inside the housing and is divided into a similar gutter shape or a semi-cylindrical shape. The semi-cylindrical inner member is attached to the outer housing in a state where the inner housing is pivotally displaced by a required angle around the axis of the trough, so that the split joint surface of the outer housing and the split joint of the inner member are provided. A mixer for producing molding sand, characterized in that the surfaces are shifted in phase.   The molding sand according to claim 1, wherein the inner divided surface is set at a rotation angle of 3 degrees to 6 degrees that has advanced in the direction of rotation of the screw with respect to the divided surface of the trough. Mixer to manufacture.   At a required position on each peripheral part of the inner divided into two, a fixing bolt is protruded radially outward, and a hole for passing the fixing bolt is formed in the trough. The fixing bracket is provided in a peripheral portion of the hole, and the fixing bolt is detachably fixed to the fixing bracket via a nut. A mixer that manufactures foundry sand.

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