JPH09108774A - Molding sand charging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make sand charging to a molding flask uniform, to improve die precision and to reduce a quantity of sand used by arranging a sand charging chute as facing to a molding flask and freely moving the chute from one end of a molding flask opening part to other end position in molding. SOLUTION: A device consists of a running truck 6, which is arranged with a fixed frame 3 above a molding flask 2 placed on a pattern truck on a transfer means and under a molding sand transfer conveyer 9 and is placed on a rail laid on the frame 3 and moves in reciprocation in the horizontal direction, and a sand charging chute 7 mounting a sand discharging mouth to the running truck 6. When charging molding sand in the molding flask 2 by this device, the running truck 6 and a sand discharging mouth 7A of the sand discharging chute 7 are moved/faced to right end of the molding flask 2 by a drive motor 8. Successively, molding sand is transferred/charged to the sand charging chute 7. After required sand is charged, the running truck 6 is successively moved from the right end of the molding flask 2, a center part and then a left end part A while continuing sand charging.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an apparatus for charging a molding sand for molding a mold into a molding flask.

[0002]

2. Description of the Related Art Conventionally, as means for charging mold sand into a molding flask, the mold sand conveyed by a belt conveyor has been charged through a fixed shoe or hopper.

[0003]

However, when the mold sand is introduced into the flask by the above means, the mold sand is introduced into only one place in the flask and the amount of sand in the entire flask becomes non-uniform. When squeeze molding with a squeeze plate in a state, it is not possible to apply a uniform force over the entire mold, so it is not possible to obtain a mold with uniform mold strength, and problems such as mold collapse and inaccurate casting occur. There was a problem of doing. In order to solve such a problem, in the past, a large amount of sand was thrown in, and the uneven distribution of the amount of sand in the flask was dealt with by scraping unnecessary sand and leveling it, but the amount of sand used increased. At the same time, the effort to scrape and level the sand was necessary, and it was not a fundamental solution. The present invention has been made to solve the above problems, and an object of the present invention is to provide a mold sand charging device capable of uniformly distributing and charging the mold sand in the flask.

[0004]

The above-mentioned problems can be solved by a mold sand throwing device having the following features. That is, a mold sand feeding device that conveys the mold sand by a belt conveyor and charges the mold sand into the molding frame by a sand charging shot, and a frame disposed below the front end of the belt conveyor. A traveling carriage that is horizontally reciprocally movable on the frame and placed on the frame; and a discharge port attached to the traveling carriage so that its discharge port extends from one end of the opening of the casting frame. And a sand throwing stool that can be moved to any position up to the other end so as to face each other.

[0005]

FIG. 1 is a block diagram showing an embodiment of the present invention.
A detailed description will be given with reference to FIG. A casting frame 2 is placed on a model trolley 1 placed on a conveying means (not shown in FIG. 1). A frame 3 fixed by means (not shown) is arranged above the flask 2. A rail 4 is laid on the frame 3, and a traveling carriage 6 having a wheel 5 rotatably mounted on the bottom of the frame 4 is mounted on the rail 4 and the wheel 5 is mounted on the rail 4. It is mounted such that it can be moved back and forth horizontally in the horizontal direction by contacting it on the surface 4.

A through hole 6A is formed in the traveling carriage 6, and a hopper-shaped sand introduction shoe 7 is provided at the through hole 6A, and a discharge port 7A at the lower end thereof is located below the frame 3. It is inserted into the casting frame 2 so as to come close to the upper surface of the casting frame 2. A variable speed drive motor 8 for rotating the wheels 5 is attached to a right end portion of an upper surface of the traveling carriage 6, and the traveling carriage 6 is at least operated by operating the driving motor 8. The discharge port 7A is horizontally reciprocally movable between positions corresponding to one end and the other end of the opening of the casting frame 2.

A belt conveyor 9 is supported above the frame 3 by means (not shown) and has a dust-preventing cover 10. The front end of the belt conveyor 9 is located in the approximate center of the frame 3. Are arranged. The upper end opening, which is the sand input port of the sand input shunt 7, has the discharge port 7A located on either side of the opening of the casting frame 2 as the traveling carriage 6 moves. Is also sized so that mold sand can be charged into the sand charging shoe 7 from the tip of the belt conveyor 9.

In order to actually insert the molding sand into the flask 2 with the structure as described above, first, the drive motor 8 is operated to move the traveling carriage 6 into the frame. 3 is moved so that the discharge port 7A of the sand charging shoe 7 faces the right end portion of the casting frame 2.
Next, by operating the belt conveyor 9, the molding sand on the belt conveyor 9 is conveyed to the tip of the belt conveyor 9, and the molding sand is charged into the sand charging shoe 7 (FIG. 1). .

When the required amount of mold sand has been charged near the right end side of the flask 2 by continuing the charging, the drive motor 8 is operated while continuing the charging of the sand to move the traveling carriage 6 to the frame. -By moving the upper part of the frame 3 slightly to the left, the discharge port 7A of the sand charging shoe 7 is made to face the substantially middle position of the opening of the flask 2, and the mold sand is continuously charged in that state. (Figure 2). Then, when the required amount of the molding sand is put into the substantially central portion of the opening of the flask 2, the discharge port 7A is similarly opposed to the left end position of the opening of the flask 2 and the molding sand is put therein. Continue (Fig. 3). In addition, depending on the shape of the mold, there is a slight difference in the amount of sand required depending on the location within the flask. Therefore, by changing the speed of the drive motor 8, the horizontal moving speed of the traveling carriage 6 is accelerated or decelerated. Then, an appropriate amount of sand is distributed over the entire inside of the flask 2.

By the above operation, after the required amount of molding sand has been put into the entire casting frame 2, the belt conveyor 9
To stop the casting of the mold sand. In the present embodiment, the casting of the molding sand is completed only by moving the sand feeding shunt 7 from the right end to the left end of the casting frame 2 once, but the conveyance of the molding sand by the belt conveyor 9 is performed. Depending on the speed and the volume of the flask 2, the sand feeding shoe 7
The mold sand may be thrown in by repeatedly moving on the flask 2. The flask 2 which has been filled with a predetermined amount of mold sand is transferred to a molding device (not shown) while being placed on the model carriage 1 by the above-mentioned transfer means, and the mold is squeezed by a squeeze plate. Become.

As is apparent from the above description, the present invention is a mold sand throwing apparatus which conveys mold sand by a belt conveyor and throws the mold sand into a casting frame by a sand throwing shoot, A frame disposed below the front end of the belt conveyor; a traveling carriage that is horizontally movable on the frame and is mounted on the frame; and a frame mounted on the traveling carriage. The discharge port is moved to an arbitrary position between one end and the other end of the opening of the flask, and the sand charging shunt is made to be able to face each other; Since it is possible to uniformly add the mold sand and to make the mold strength to be molded uniform, it is possible to improve the mold accuracy. In addition, since the amount of sand required depends on the volume of the flask, the amount of sand used can be reduced, and the leveling work after sand addition is also unnecessary.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a mold sand feeding device at the start of sand feeding.

FIG. 2 is a partial cross-sectional view showing a mold sand feeding device during sand feeding.

FIG. 3 is a partial cross-sectional view showing a mold sand feeding device at the end of sand feeding.

[Explanation of symbols]

 2 Casting frame 3 Frame 6 Traveling carriage 7 Sand feeding stool 9 Belt conveyor

Claims (1)

[Claims] 1. The mold sand is conveyed by a belt conveyor,
A mold sand throwing device for throwing mold sand into a casting frame by a sand throwing shot, wherein a frame 3 is provided below the front end of the belt conveyor 9; A traveling carriage 6 mounted on the frame 3 so as to be capable of reciprocating in a direction; and by being attached to the traveling carriage 6, its discharge port 7A extends from one end of the opening of the casting frame 2 to the other end thereof. Between the sand throwing shunt 7 which is moved to any position between
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