JPS6241825B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a frame breaking device for a pressure reduction process, and more particularly to a frame breaking device that integrates a sand recovery hopper and a dust collection hood.

In the vacuum process, dry molding sand containing no binder is fed into a mold and a mold is formed under vacuum conditions. In such a pressure reduction process, the mold is opened by returning the inside of the mold to atmospheric pressure. This reduced-pressure process allows for extremely easy molding, and since the sand is in a dry state, the sand can be easily removed when the frame is disassembled, and the sand can be reused as is. However, when the frame is dismantled, fine powder in the sand is scattered, and it is essential to collect the dust. Therefore, in the past, the metal frame after casting was transported into a dust collection hood and the frame was disassembled there. Such conventional frame-breaking requires a large dust collection hood, and requires a means other than a crane hoist to transport the metal frame into the dust collection hood, which not only increases the size of the Ikioi equipment but also makes the work more difficult. The environment was deteriorating and dust collection efficiency was low.

This invention provides a device that eliminates the above-mentioned drawbacks during frame breaking in the depressurization process, and by integrating a sand recovery hopper and a dust collection hood, the frame breaking device can be made smaller and the dust collection efficiency can be improved. This aims to improve the efficiency of frame solving work.

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 to 3 show a mold disassembly apparatus using a reduced pressure process, which is used, for example, when casting long castings. The sand recovery hopper 1 has an upper box-shaped part 4 whose upper opening 2 corresponds to the metal frame 3 and an inclined part 5 having a V-shaped cross section at the bottom, and is fixed on the machine frame 6. has been done. A sand conveying member such as a screw feeder 7 is provided at the lower end of the hopper 1 and is rotated by a motor 9 via a sprocket 8 to transport sand in one direction and discharge it from the sand discharge port 10 to the outside of the device. It is now being transported to A dust collection opening 11 is provided on the side surface of the upper box-shaped portion 4 of the hopper 1, and the dust collection opening 11 is connected to a dust collection device (not shown). Further, support stands 12 for supporting and fixing the metal frame 3 are provided on both end faces of the box-shaped portion 4 of the hopper 1, and a recess 14 that fits into the protrusion 13 of the metal frame 3 allows the lower end of the metal frame 3 to be attached to the hopper. The metal frame is fixed in a position such that it is partially inserted into the opening 2. and a sealing member for sealing the gap between the metal frame 3 and the hopper opening 2;
For example, a rubber seal 15 is provided around the upper edge of the hopper opening 2 toward the inside of the hopper. Furthermore, a girder is attached to the lower frame of the metal frame 3 to prevent the product from falling.

In addition, a wire mesh 16 is placed inside the dust collection opening 11 and the hopper 1 below the level of the dust collection opening.
Furthermore, if a film stopper 17 is provided on the pillar 20 at the center along the longitudinal direction of the box-shaped part 4 of the hopper 1, the plastic film stretched on the lower surface of the metal frame 3 can be attached to the film stopper 17, and as needed. The quenching mold used in this process is preferable because it does not catch on the wire mesh and prevent the sand from falling into the sand conveying member. Preferably, a cutting board 18 is provided at the lower part of the hopper 1 and at the upper part of the sand conveying member.
To uniformly supply sand falling from above to a sand conveying member. Note that the sand conveying member is not limited to the screw feeder, and a belt conveyor or the like may be used.

Next, the operation of such a frame solving device will be explained. First, while decompressing the casting mold frame 3 after casting, lift up the protrusion 19 on the side of the mold using a crane or the like, engage the mold protrusion 13 with the recess 14 of the support base 12, and move the mold frame 3 to the top of the device. Fixed to. Next, by returning the inside of the metal frame 3 to atmospheric pressure, the sand and plastic film inside the metal frame 3 are allowed to fall into the hopper 1.
At this time, the casting remains in the metal frame 3 without falling due to the girders of the lower frame of the metal frame 3. Also, at this time, the screw feeder 7 and the dust collector are operated.
The sand falls through the hopper, passes through the wire mesh 16, and is sent from the board 18 to the screw feeder 7.
The sand is carried out from the sand discharge port 10 and reused. Dust generated during frame disassembly is prevented from exiting the apparatus by the rubber seal 15 and the plastic film on the upper surface of the upper frame of the metal frame 3, and is sucked into the dust collector through the dust collection opening 11. The plastic film falling with the sand is caught on the film stopper 17, and the quenching mold is caught on the wire mesh 16, so that the falling of the sand is not hindered. After sand removal is completed, the upper frame of the metal frame 3 is removed, the casting from which the remaining sand has been scraped off is taken out, and finally the lower frame of the metal frame 3 is taken out.

According to such a frame dismantling apparatus according to the present invention, since a dust collection hood is not required, an overhead crane hoist or the like can be used without any trouble, resulting in extremely good workability. Furthermore, the dust collection efficiency is significantly improved compared to the case where a dust collection hood is used, and a compact dust collection device with a small capacity can be used. Furthermore, the frame disassembly work in the dust collection hood as in the past is no longer necessary, the work environment is greatly improved, and equipment space and equipment costs are reduced.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the frame disassembling device according to the present invention, in which FIG. 1 is a front view, FIG. 2 is a plan view, and FIG. 3 is a longitudinal sectional view. 1... Hopper for sand collection, 2... Upper opening of hopper, 3... Metal frame, 6... Machine frame, 7... Screw feeder, 11... Opening for dust collection, 12...
Support stand, 15...Rubber seal, 16...Wire mesh, 1
7... Film stopper, 18... Jiyama board.

Claims (1)

[Claims] 1. A sand recovery hopper having an upper opening into which a mold frame is inserted, one or more dust collection openings provided on the upper side of the hopper and connected to a dust collector, and a sand collection hopper provided at the lower end of the hopper. a sand conveying member, a metal frame support for fixing the metal frame so that the lower part of the metal frame is positioned within the hopper opening, and a sealing member provided around the upper edge of the hopper opening toward the inside of the hopper. Frame breaking equipment for decompression process equipped with.