JPS6217153Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to the correction of sand molds in automatic molding equipment in foundries, particularly to a correction device for sprue hole openings.

[Conventional technology] In automatic molding equipment, the mold flasks arranged on a conveyor go through processes such as filling mold sand and extracting models as the conveyor moves, and then overlapping the upper and lower molds. In the empty part of the sand mold, i.e.
It is necessary to remove unnecessary sand that has entered the casting area and repair the molding. In particular, in the case of a direct weir, the opening edge of the sprue hole into the mold must be rounded to prevent the sand from crumbling during pouring. You need to try to prevent it.

Conventionally, such shaping has been performed manually, which is time consuming and requires care not to damage other parts during the operation, resulting in poor workability.

For this reason, for example, as shown in Japanese Utility Model Publication No. 49-32566, there is a system in which a rotating conical tool is attached to the frame on the conveyor that transports the mold, and is raised and lowered toward the sprue.
A lower pressure rod and a spring are provided alongside the tool, and the flat plate at the end of the lower pressure rod comes into contact with the upper surface of the sand mold to operate a limit switch, thereby stopping the tool from descending.

[Problems to be solved by the present invention] As described above, when the rotary tool is moved up and down to correct the casting sand mold, it is necessary to adjust the lowering position of the tool, but the lower pressure rod that moves up and down with the correction tool is A limit switch operated by a detection rod, such as the above, has a complicated structure and is used in an environment with a lot of dust, so it has the disadvantage that the switch and sliding parts are likely to malfunction.

[Means for solving the problem] When automating the correction of the sprue hole, the present invention includes a cup of elastic material that surrounds the correction tool and covers the upper surface of the cavity of the sand mold in the holding cylinder of the correction tool. When the cup is brought into contact with the upper surface of the sand mold when the cup is lowered, the correction tool is stopped and compressed air is blown out from an air hose opening into the cup.

[Example] This will be explained with reference to the example shown in the figure.
1 is the mold flask, 2 is the filled casting sand, 3 is the empty part,
4 is a sprue hole, 5 is a conveyor, and 6 is an operating arm, which is supported on a base 7 on the side of the conveyor and rotated in the vertical direction by a drive device, such as an actuator 8. Reference numeral 9 denotes a correction tool which is rotatably supported by a holding cylinder 10 provided at the tip of the operating arm 6 via a buffer arm, and has a scraping piece 9a at the tip thereof adapted to the correction shape of the opening edge of the sprue hole. The scraping piece 9a is, for example, a steel wire bent according to the modified shape, or a plate piece adapted to the modified shape. Reference numeral 11 denotes a device for rotating the correction tool 9, such as a motor attached to the base 7, and is connected to the correction tool 9 via a flexible rotating shaft 12. 13
Reference numeral 14 is a flexible cup made of an elastic material, such as rubber, attached to the holding cylinder 10, and 14 is an air hose opened in the cup, through which compressed air is sent from an air supply device 15.

The mold flask 1 is intermittently conveyed by a conveyor 5 and stopped at a fixed position by a limit switch or the like.
The correction tool 9 connected to the flexible rotating shaft 12 is aligned in advance so that the scraping piece 9a matches the sprue opening edge at the point where the operating arm 6 stops descending, and the mold flask 1 on the conveyor is aligned with the base 7. When the tool is moved to the installed position and stopped, the actuator 8 pushes down the operating arm 6, and the correction tool 9 is lowered onto the mold.
During the descent, the motor 11 is connected via the flexible rotating shaft 12.
rotates the correction tool 9 and when the operating arm 6 reaches the lowering point, the scraping piece 9a of the correction tool 9 scrapes the casting sand on the edge of the sprue opening and shapes it into the desired shape as shown in FIG. 2A.

The cup 13 descends together with the correction tool 9, and when its peripheral edge hits the casting sand surface, the downward movement of the correction tool stops and the cup covers the upper surface of the cavity 3 of the mold. Blow out the scraped casting sand and unnecessary sand in the empty part 3,
To discharge a mold from a sprue hole 4 to below a conveyor 5 without scattering around the mold.

Furthermore, even if the operating arm 6 descends somewhat excessively, the mold will not be damaged due to the elasticity of the cup 13.

The shaping and sand discharge are performed in a few seconds, and the rotation of the correction tool 9 and the supply of air from the air hose 14 are stopped, and the operating arm 6 is raised.

The correction tool 9 may be rotated by providing a motor in the upper part of the holding cylinder 10.

[Effects of the present invention] As described above, the present invention provides an automatic molding device with a base on the side of the stopping position of the mold that is intermittently transferred to a fixed position, and an operating arm attached to the base. A correction tool is provided at a sprue correction position of the stopped sand mold by the operating arm, and the correction tool is rotated at the correction position to shape the casting sand mold, and a cup is lowered together with the correction tool. Since the upper surface of the hollow part of the sand mold is covered and compressed air is blown into the cup to discharge unnecessary sand below the mold, correction of the sprue hole of the sand mold can be done in synchronization with the transfer in the automatic molding device. In addition, by providing a cup, the position of the correction tool can be maintained, uniform shaping can be performed, and at the same time, the inside of the mold can be cleaned without scattering the casting sand around. This has the effect of improving the surrounding environment, simplifying the maintenance of the repairing device, increasing production efficiency, and improving the productivity of molding.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the present invention, and a portion thereof is shown in cross section. FIG. 2 is an enlarged partial cross-sectional view showing the sand mold after correction. 1 is a mold flask, 2 is a sand mold, 3 is a cavity, 4 is a sprue hole, 5 is a conveyor, 6 is an operating arm, 7 is a base, 8 is an actuator, 9 is a correction tool, 9a is a scraping piece,
10 is a holding cylinder, 11 is a motor, 12 is a flexible rotating shaft, 13 is a cup, 14 is an air hose, and 15 is an air supply device.

Claims (1)

[Scope of utility model registration request] In an automatic molding device that intermittently transfers a mold filled with sand to a fixed position, there is a base provided on the side of the mold stop position, an operating arm that is supported by this base and moves up and down, and a sand mold that is moved by the operating arm. a cup made of an elastic material that is supported surrounding the correction tool and descends together with the correction tool to cover the upper surface of the cavity of the sand mold; and an air supply hose for sending compressed air into the cup.