JPS5843180B2 - Decompression method and device for vacuum molding molds - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for cracking a vacuum mold mold after pouring molten metal.

Conventionally, when disassembling a vacuum mold that has already been poured, the vacuum action in the flask holding the vacuum mold above the sand recovery hopper is released, and the filler and castings in the flask are removed from the hopper. However, this produced an extremely large amount of dust, which significantly worsened the working environment.

Furthermore, if such a working environment were to be purified, a large dustproof hood and dust collector would be required, leading to an enormous increase in equipment costs.

The present invention aims to overcome these drawbacks.

Next, the configuration of the present invention will be explained with reference to the embodiments shown in FIGS. 1 to 3.

Reference numeral 1 denotes a pair of hollow roller conveyors in which a roller frame with flanged rollers 3 supported at approximately equal pitches is provided at a constant width interval on the upper end of a support frame 2 which is erected from a foundation. On the roller conveyor 1 are a cast product 4 that has been poured and cooled for a certain period of time, and a pair of upper and subcontractor frames 6 and 7 that are under reduced pressure and hold a filler 5.
is placed in a slidable manner.

Reference numeral 8 denotes a ventilable suction pipe connected to a depressurizing chamber 9 partitioned around the outer periphery of the flasks 6 and 7 and having its circumferential surface covered with a wire mesh filter. It is connected via a flexible conduit 11 to a vacuum pump, not shown.

Reference numeral 12 denotes a plurality of square bar members each having a square cross section, which are stretched in the subcontract frame 7 in the same direction as the suction pipe 8 at appropriate intervals.
The upper end surface of the member 12 is located slightly above the upper surface of the suction tube 8, and the upper end surface of the member 12 is located slightly above the upper surface of the suction tube 8. It is adapted to receive the cast product 4 after the filler 5 in the T is removed.

Now, below the above-mentioned pouring flasks 6, 7, which have been conveyed to a predetermined position on the hollow roller conveyor 1 and whose insides have been made negative pressure, there are, corresponding to the opening surfaces of the flasks 6, 7, The piston rod 1 of a lift cylinder 15 has a lower lid body 13 with an open top, and its outer bottom wall surface is attached upward to a horizontal frame 14 installed between the pair of support frames 2.
6 is connected to the tip via a connecting member 17, and can be raised and lowered by the operation of the lift cylinder 15, and inside the lid 13, a flange portion 18 protruding around the inner wall of the lid 13 is provided with a screw thread around the periphery. A filter 19 made of a fixed breathable filter cloth or fine wire mesh is stretched,
The interior of the lid 13 is divided into a lower chamber 13a and an upper chamber 13b.

Reference numeral 20 denotes a hollow guide pin that is suspended from the external bottom wall surface of the lid body 13 and slidably inserted into the horizontal frame 14, and the other end of the guide pin 20 has a guide pin shown in the figure. A compressed air source is connected in communication with the guide pin 20 so that the compressed air supplied to the hollow part of the guide pin 20 passes through the space formed by the lid body 13 and the filter 19 and the filter 19, and is blown upward to the outside. It has become.

Further, above the lid body 13 which can be raised and lowered at a predetermined distance, a lower part corresponding to the open bottom surface of the upper flask 6 is set as an opening surface, and the opening is approximately the same as the opening cross-sectional area of the flasks 6 and 7. A dust-proof hood 21 in the form of a lid is fixed to a fixed frame (not shown), and the dust-proof hood 21 is provided with parallel transportation via a discharge chute 22 provided with its upper end facing diagonally downward at the center of the earthen wall. A vertical transport pipe 24 is attached which is connected to the pipe 23 and whose lower end opening is provided inside the dustproof hood 21.The lower end of the vertical transport pipe 24 has a lower end branched into two branches. The upper rear end portion of the suction nozzle 25 is loosely fitted into the suction nozzle 25.
5 has its upper outer wall connected to the tip of the piston rod 27 of the lifting cylinder 26 which is attached downward to the upper wall of the dustproof hood 21 on both sides of the vertical transport pipe 24, so that the lifting cylinder 2
6, it is possible to move up and down while maintaining communication with the vertical transport pipe 24.

Note that 28 is a rubber-like elastic member attached to the periphery of the lower surface of the lower flange of the dustproof hood 21.

Next, the operation of the device configured in this way will be explained.

When the lid body 13 is lowered to a position below the flanged roller 3 and the dustproof hood 21 is raised to a position where the pair of upper and lower frames 6 and 7 conveyed on the hollow roller conveyor 1 do not interfere with each other (second Condition shown in the figure) After pouring the molten metal, after a certain cooling time, the upper and lower frames 6 and 7 are conveyed on the hollow roller conveyor 1 while the lower frames 6 and 7 are depressurized to negative.
3 and lift the piston rod 17 of the lift cylinder 15 to lift the lid body 13, press the upper end surface of the lid f*13 to the lower surface of the lower frame 7, and then lift them further as a tree. and raise it until the upper surface of the upper frame 6 comes into contact with the lower surface of the dustproof hood 21.

Next, close the switching valve 10, and connect the TC empty pump and flask 6.
, 7, and the lower chamber 1 of the lid body 13.
When low-pressure compressed air is supplied to 3a from the hollow part of the guide bin 20, the compressed air passes through the ventilated filter 19 and connects the upper and lower openings of the flasks 6 and 7 to the lid 13 and dustproof hood 2.
1 flows into and ejects into the closed space, fluidizes the sand grain-like filler in the space, and operates the piston rod 27 of the upper lifting cylinder 26 to push out,
When the suction nozzle 25 is lowered and entered into the flask 6.7, the fluidized filler is discharged together with compressed air from below.
It flows into the suction nozzle 25, passes through the vertical transport pipe 24, is sent into the discharge chute 22 at the uppermost end, is further forced into the transport pipe 23 connected to the discharge port of the discharge chute 22, and is transported to a predetermined position.

In this way, the flasks 6 and 7 after discharging the filler 5
Only the cast product 4 remains inside.

After that, after cutting off the supply of compressed air to the lower chamber 1'3a of the lid body 13, the lift cylinder 15 and the lifting cylinder 26 are respectively operated in reverse to lower the flasks 6 and 7 and move them to the hollow roller conveyor. 1 and raise the suction nozzle 25 to the initial starting position.

After that, the casting flasks 6 and 7 holding the cast product 4 have hollow openings.
It is sent to the next process on the la conveyor 1 by a conveying means (not shown), and the process is completed.

Next, another embodiment of the present invention will be described with reference to FIG.

Reference numeral 29 denotes a pair of hollow roller conveyors in which flanged rollers 31 extended over a support frame 30 are pivotally supported at approximately equal pitches, and 32 and 33 are a pair of matched top roller conveyors having the same structure as in the previous embodiment. A casting flask and a lower flask, 34 is a suction pipe,
35 is a square bar member, 36 is a cast product, and 37 is a filler.

Reference numeral 38 is a lid-shaped discharge chute in which a vertical bent pipe 39 is connected to one end of the flasks 32 and 33 provided at the upper part, which are inclined diagonally downward from an opening having approximately the same opening area as the opening area. The inside of the discharge chute 38 is divided into a lower chamber 38a and an upper chamber 38 by a filter 40 made of a ventilated furnace cloth or a fine wire mesh stretched parallel to the inclined bottom wall of the discharge chute 38.
b, and the discharge end of this upper chamber 38b is
The lower end is connected to the vertical bent pipe 39 loosely fitted into the vertical opening of the transport pipe 41.

Further, the discharge chute 38 is connected to the tip of a piston rod 44 of a lift cylinder 43 which is attached upward to a horizontal frame 42 extending over the middle part of the support frame 30 at its bottom outer wall. It can be moved up and down while maintaining communication with the transport pipe 41.

Reference numeral 45 denotes a hollow guide pin having a through hole leading to the lower chamber 38a, which is slidably inserted into the horizontal frame 42, and whose lower end is communicatively connected to a compressed air source (not shown). There is.

Above the discharge chute 38 configured as described above, an upper lid body 46 whose lower opening surface is approximately the same size as the opening area of the upper casting flask 32 is installed on the upper surface of the roller frame from the hollow opening to the la conveyor 29. It is fixed to the lower surface of the gate-shaped support frame 47, and furthermore, the upper end is connected to a dust collector (not shown) and the lower end is opened inside the lid 46 at the center of the earthen wall of the lid 46. An exhaust duct 48 is connected in communication.

Note that 49 is an elastic seal attached to the periphery of the lower surface of the lower flange of the lid body 46.

Next, the effect of the material that has been rubbed in this way will be explained.

With the discharge chute 38 lowered to a position below the flanged roller 31, the poured upper and lower flasks 33 are vaporized under reduced pressure.
, 32 are conveyed on the hollow roller conveyor 29 to a position directly above the discharge chute 38, the piston rod 44 of the lift cylinder 43 is actuated upward, and the discharge chute 3
8 to press the upper end surface of the discharge chute 38 to the lower surface of the lower frame 33, and then further raise the discharge chute 38 and the flask 3.
2.degree. 33 is raised as one until the upper surface of the upper flask 32 comes into contact with the lower surface of the lid 46.

Thereafter, the reduced pressure inside the flasks 32 and 33 is released, and the guide bin 4 is placed in the lower chamber 38a of the discharge chute 38.
5. When low-pressure compressed air is supplied from the hollow part, the compressed air passes through a filter 40 such as a ventilated furnace cloth or a fine wire mesh, flows into the upper chamber 38b, and into the sealed flasks 32 and 33, forming sand particles. The filler material 37 is fluidized.

That is, the low-pressure compressed air passes through the filter 40 and enters the filler 37 in a finely dispersed state, forms many small bubbles, and fluidizes the filler 37.

The fluidized filler 37 forms a downwardly inclined filter.
40 and is fed into the transport pipe 41 via the vertically curved pipe 39, and then transported through the transport pipe 41 to a predetermined position.

Meanwhile, the compressed air is discharged through the exhaust duct 48.

After all the filler material 37 in the flasks 32 and 33 has been discharged into the transport pipe 41 in this way, the supply of compressed air is stopped, the lift cylinder 43 is operated in reverse, the discharge chute 38 is lowered, and the casting Casting flasks 32, 3 holding product 36
3 onto the hollow roller conveyor 29.

The flasks 32, 33 are then conveyed forward on the hollow roller conveyor 29 by means of a transport pusher (not shown).

In short, the process of completing pouring, sealing the upper and lower opening surfaces of the vacuum molding flask that holds the vacuum mold inside which has cooled the casting for a certain period of time, and releasing the vacuum effect inside the flask. Then, compressed air is introduced into the flask from below the lower flask to fluidize the filler in the flask, and the filling material is fluidized through the air conveying device.
．． using a method of discharging the filler from the flask,
A filter is provided inside a liftable lid having an opening at the top, and partitioned into an upper chamber connected to the upper opening and a lower chamber connected at one end to a compressed air source, and further comprising: Corresponding to the upper part of the lid body, a dustproof hood with an opening at the bottom is fixedly installed, and a dustproof hood built in the dustproof hood,
One end of the upper part is provided with an elevating suction nozzle that is connected to the lower end opening of the vertical transport pipe above the dust-proof hood so that it can communicate with the lower end, and an elevating and lowering suction nozzle is provided at one end that is inclined diagonally downward from the upper opening. A ventilable filter is provided inside the possible discharge chute to divide the upper chamber into an upper chamber connected to the upper opening and the discharge port, and a lower chamber connected at one end in communication with a compressed air source; Since the lid body with an opening at the bottom is fixedly installed above the discharge chute, the mold filler can be disposed of without generating dust, which is useful for purifying the working environment, and also for large-sized Since there is no need to install a dustproof hood, it is effective in reducing equipment costs.

[Brief explanation of the drawing]

FIG. 1 is an overall view showing an embodiment of the present invention. FIG. 2 is a partially cutaway sectional view showing the state of the device of the present invention before starting. FIG. 3 is a partially cutaway sectional view showing the operating state of the device of the present application. FIG. 4 is a partially cutaway sectional view showing another embodiment of the present invention. 6.7.32 Body, 13a, 3...Upper chamber, 1...Dust-proof hood, Output chute, 4. 33...Casting flask, 13...Lower lid 8
a-"Lower chamber, 13b, 38b 9.40...Filter, 21...24...
... Vertical transport pipe, 38 ... Exhaust 6 ...
- Upper lid body.

Claims (1)

[Claims] 1. The upper and lower opening surfaces of a vacuum molding flask, which holds a vacuum mold inside which the casting machine has been cooled for a certain period of time after pouring has been completed, are sealed, and the inside of the flask is sealed. a step of releasing the decompression effect, and introducing compressed air into the flask from below the subcontractor flask to fluidize the filler in the flask, and discharging the filler from the flask via an air transport device. A method for dismantling a vacuum mold mold, which comprises the steps of: 2. A ventilable filter 19 is installed inside the lower lid body 13 which has an opening at the upper part and can be raised and lowered, and an upper chamber 13b connected to the upper opening and a lower part whose one end is connected to a compressed air source so as to be able to communicate with the upper chamber 13b. Further, a dustproof hood 21 with an opening at the lower part is fixedly installed corresponding to the upper part of the lid body, and is built in the dustproof hood 21, and one end of the upper part is connected to the upper part of the dustproof hood 21. A frame dismantling device for a vacuum mold mold, characterized in that a suction nozzle that can be raised and lowered is connected to the lower end opening of the vertical transport pipe 24 in a communicable manner. 3. A ventilated filter 40 is installed inside a liftable discharge chute 38, which has a discharge outlet at one end inclined diagonally downward from the upper opening, to form an upper chamber 38b connected to the upper opening and the discharge outlet. and a lower chamber 38a whose one end is communicatively connected to a compressed air source, and furthermore, an upper lid body 46 with an opening at the lower part is fixedly installed above the discharge chute 38. Frame disassembly equipment for vacuum molding molds.