JP4269272B2 - Foundry sand recovery equipment - Google Patents

Description

The present invention relates to a facility for recovering cast sand after pouring into a mold with a cast frame formed using expensive foundry sand.

Conventionally, as one method of releasing the poured mold, the upper mold is separated from the lower mold with the casting material remaining on the lower mold after pouring into the upper and lower molds composed of molds with cast frames. Subsequently, there is one in which the casting material is taken out from the lower mold (for example, Patent Document 1).
Japanese Patent Laid-Open No. 10-291066

However, in the conventional mold releasing method configured in this way, the foundry sand on the casting material is taken together with the casting material to the subsequent casting material finishing process, and the casting material finishing process is performed. Since the foundry sand taken out to the sea contains a large amount of iron pieces separated from the foundry material, most of it is not collected and discarded.

As a result, when the foundry sand used for mold making is expensive, for example, zircon sand, cerabead, etc., the expensive foundry sand needs to be replenished because it decreases in large quantities sequentially from the mold making line. As a result, the maintenance and management of the foundry sand costs enormously, and the replenishment of new sand causes unstable properties of the entire foundry sand and induces defective castings. When trying to collect the foundry sand brought into the material finishing process, there is a problem that an apparatus for that purpose is required and the equipment cost increases.

The present invention has been made in view of the above circumstances, and its object is to separate the upper mold from the lower mold while leaving the casting material, and then remove the casting material from the lower mold. An object of the present invention is to provide a foundry sand recovery facility capable of reducing the amount of foundry sand taken out to the foundry material finishing process as much as possible.

In order to achieve the above object, the foundry sand recovery facility according to the present invention is a facility for recovering the foundry sand after pouring into a mold with a cast frame formed using expensive foundry sand. A sand collecting device that collects and conveys the sand to the sand recycling means, a conveying device that conveys the lower mold with a cast frame that extends along the sand collecting device and is left along with the casting material, and the conveying device. A compressed air injection device that is provided directly above the device and has a plurality of nozzles for injecting compressed air, and blows off the foundry sand on the casting material remaining on the lower mold, and a position directly above the conveying device A reversing device disposed on the downstream side of the compressed air injection device in order to reverse the lower mold and the casting material and drop the foundry sand remaining on the lower mold and the casting material into the sand collecting device,
The compressed air injection device includes a cover mechanism that surrounds the casting material and the nozzle and defines a space communicating with a dust collector with the casting frame.

The expensive foundry sand in the present invention includes, for example, zircon sand and cera beads.

As is apparent from the above description, the present invention is a facility for recovering the foundry sand after pouring into a mold with a cast frame formed using an expensive foundry sand, and recovers the foundry sand and sand reclaiming means. A sand collecting device to be transported to the bottom, a transport device for transporting a lower mold with a casting frame extending and disposed along the sand collecting device, and a casting material remaining on the sand collecting device. A compressed air jetting device provided with a plurality of nozzles for jetting compressed air to blow the foundry sand on the casting material remaining on the lower mold, and the compressed air jetting device at a position directly above the conveying device A reversing device that is disposed on the downstream side of the lower mold and reverses the lower mold and the casting material to drop the casting sand remaining on the lower mold and the casting material into the sand collecting device, and the compressed air The injection device comprises the casting material and Since the surrounds the periphery of the serial nozzle and the space communicating with the dust collector with a cover mechanism which defines between said drag flask after separating the upper mold from the lower mold, leaving the casting material, the lower the casting material In the mold separation method, which is taken out from the mold, it is possible to reduce the amount of casting sand taken out to the casting material finishing process as much as possible and to reduce the amount of casting sand by spraying compressed air from the nozzle. It has excellent practical effects such as the dust generated when the foundry sand is blown away can be collected in a dust collector accurately .

Hereinafter, an embodiment of a foundry sand recovery facility to which the present invention is applied will be described in detail with reference to FIGS. As shown in FIG. 1, the foundry sand recovery facility includes an oscillating conveyor 1 as a sand recovery device that recovers the casting sand and transports it to a sand recycling means (not shown), and is directly above the oscillating conveyor 1. A lower mold 4 with a casting frame 3, which extends along this, and on which a casting material 2 remains, is placed on a platen carriage 6 on a rail 5 and is separated from the lower mold 4. The lower mold 4 includes a conveying device 9 that intermittently conveys one frame to the right by the roller conveyor 7 with a hook, and a plurality of nozzles that are disposed directly above the conveying device 9 and that inject compressed air. A compressed air injection device 10 that blows off the foundry sand on the casting material 2 remaining on the top, and a right side of the compressed air injection device 10 at a position directly above the conveying device 9 and the bottom with the casting frame 3 1 for casting mold 4, casting material 2 and surface plate carriage 6 0 degrees is inverted with inverter 11 to drop the remaining molding sand on the lower mold 4 and the casting material 2 to the vibration conveyor 1 and, in are constituted.

 And in the said compressed air injection apparatus 10, as shown in FIG.2 and FIG.3, the upper surface center part of the ceiling of the portal frame | frame 13 which stood on the roller conveyor 7 with the flange straddling the said conveying apparatus 9 was carried out. The upward first cylinder 14 is fixed, and the central portion of the elevating member 15 extending forward and backward is fixed to the upper end of the piston rod of the first cylinder 14. On both front and rear sides of the elevating member 15, two guide rods 17, 17 extending downward and penetrating vertically through the ceiling of the portal frame 13 through holders 16, 16 are suspended. A nozzle mechanism 18 is attached to the lower ends of the guide rods 17 and 17, and the nozzle mechanism 18 is moved up and down by the expansion and contraction operation of the first cylinder 14.

An upward second cylinder 19 is fixed to the center of the lower surface of the ceiling of the portal frame 13 at the tip of the pinton rod, and the nozzle mechanism 18 and the casting frame are attached to the lower end of the second cylinder 19. A cover mechanism 20 capable of enclosing the lower mold 4 with 3 is suspended through the two guide rods 17 and 17 via holders 21 and 21, and the cover mechanism 20 is provided in the second cylinder 19. It is designed to move up and down by the contraction operation. In the nozzle mechanism 18, a large number of nozzles 22, 22 are fixed downward on a rectangular plate-like support frame 23, and the tip level of these nozzles 22, 22 is the mold material 2 on the lower mold 4. In order to improve the flow of the compressed sand and the blown casting sand on the surface of the casting material 2,
As shown in FIG. 5, the compressed air outlets of the nozzles 22 and 22 are arranged so that the jetted compressed air is ejected toward the center line extending in the left and right directions in the lower mold 4 and then toward the center. It is set up.

In the cover mechanism 20, as shown in FIGS. 2 and 3, a square cylinder member 25 is suspended from the lower surface of the cover body 24, and the upper end of the square cylinder member 25 supports the nozzle mechanism 18. A sliding member 26 wound around the frame 23 is loosely inserted in a vertically and slidable manner. Further, a movable duct 28 for the suction port 27 is provided on the back side of the rectangular tube member 25, and a lower end of a fixed duct 29 communicating with a dust collector (not shown) is loosely inserted into the movable duct 28, so that the cover body The fixed duct 29 and the movable duct 28 are connected even when the 24 and the rectangular tube member 25 are lowered. The front wall portion of the sliding member 26 can substantially close the suction port 27 when the rectangular tube member 25 is raised (see FIG. 3). This is because when the molding sand is not removed by compressed air, the suction port 27 is closed to reduce the amount of dust collected by the dust collector and to save energy.

In the reversing device 11, as shown in FIGS. 1 and 4, a pair of left and right annular members 31 and 31 are connected to a portal-shaped machine base 30 installed across the conveying device 9. The clamp device 33, which is composed of a plurality of connecting members 32, 32 with rails and can hold the casting material 2 in the lower mold 4 with the casting frame 3 placed on the surface plate carriage 6, has four sets of support rollers 34, 34 is rotatably supported in a vertical plane via 34, and is further engaged with one of the annular members 31 and 31 on the ceiling of the machine base 30 to rotate the clamp device 33 forward and backward. A drive mechanism 35 is mounted, and the clamp device 33 is rotated forward and reverse by about 180 degrees as the drive mechanism 35 is driven.

The clamping device 33 grips the casting material 2 on the lower mold 4 with the casting frame 3 placed on the platen carriage 5. A nozzle 39 for injecting compressed air is attached to the tip of the claw member 38 of the clamp device 33.

As shown in FIG. 1, the structure thus constructed is poured into the cavities of the upper and lower molds which are placed on the surface plate carriage 6 and configured by the molds with cast frames, and after the molten melt is solidified. The upper mold is separated from the lower mold 4 while the casting material 2 remains on the lower mold 4, and the separated upper mold 8 with a casting frame is placed on the roller conveyor 7 with a flange and placed on the surface plate carriage 6. In order to recover the foundry sand from the state in which the lower mold 4 with the frame 3 is positioned in the compressed air injection device 10, first, the second cylinder 19 of the compressed air injection device 10 is extended to lower the cover mechanism 20. Thus, the upper surface of the lower mold 4 and the casting material 2 remaining on the lower mold 4 are surrounded (see (a) of FIG. 6).

Next, the first cylinder 14 of the compressed air injection device 10 is contracted to lower the nozzle mechanism 18 and the nozzles 22 and 22 are pierced into the foundry sand on the casting material 2, and then from the cover mechanism 20 by the dust collector. Under the collected state, the compressed air is sprayed from the nozzles 22 and 22 to blow off the foundry sand fixed on the foundry material 2 (see FIG. 6B). Foundry sand blown off from the casting material 2 falls onto the lower casting frame 4 and the casting material 2. The dust generated at this time is collected by the dust collector via the movable duct 28 and the fixed duct 29.

Subsequently, the surface plate carriage 6 on which the lower mold 4 on which the casting sand on the casting material 2 has been blown is moved is moved to the right by one mold and carried into the reversing device 11, and then the casting material 2 is moved by the clamping device 33. Grab and fix. Next, the lower mold 4 and the like are reversed 180 degrees by driving the drive mechanism 35 of the reversing device 11, and the compressed sand is injected from the nozzles 39 and 39 of the clamping device 33 to remove the foundry sand on the lower mold 4 and the casting material 2. Further blow off and drop onto the vibrating conveyor 1. Thereafter, the lower mold 4 and the casting material 2 are returned to the original state by driving the driving mechanism 35, and the casting sand collecting step is completed.

It is a partial cross section front view of one Example of this invention. It is an enlarged front view of the compressed air injection device 10 which is the principal part in FIG. FIG. 3 is a left side view of FIG. 2. FIG. 2 is an enlarged right side view of a reversing device 11 which is a main part in FIG. 1. It is an aa arrow line view of FIG. FIG. 3 is an operation explanatory diagram of the compressed air injection device 10.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vibratory conveyor 9 Conveyance apparatus 10 Compressed air injection apparatus 11 Inversion apparatus

Claims (1)

A facility for recovering the casting sand after pouring into a mold with a casting frame formed using expensive casting sand,
A sand recovery device for recovering the foundry sand and transporting it to the sand recycling means;
A conveying device that conveys the lower mold with a cast frame that extends along the sand recovery device and extends along the sand collecting device, and the casting material remains.
A compressed air injection device that is provided directly above the conveying device and has a number of nozzles for injecting compressed air, and blows off the foundry sand on the casting material remaining on the lower mold; and
The foundry sand that is disposed on the downstream side of the compressed air injection device at a position directly above the conveying device and reverses the lower mold and the casting material and remains on the lower mold and the casting material is contained in the sand collecting device. A reversing device to drop into,
With
The said compressed air injection apparatus is provided with the cover mechanism which encloses the circumference | surroundings of the said casting raw material and the said nozzle, and defines the space connected with a dust collector with the said casting frame, The recovery equipment of the foundry sand characterized by the above-mentioned.