JPS60115345A - Method and device for deciding reconditioned molding sand - Google Patents

Abstract

PURPOSE:To maintain the characteristic, quality, etc. of reconditioned sand always constant by taking out the sand to be treated under treatment from a treating tank, measuring the spectral reflectivity thereof, operating relationally the measured reflectivity and the spectral reflectivity of the sand having desired quality and deciding the treating condition. CONSTITUTION:When the time for treating sand in a treating vessel 1 elapses, a supporting plate 10 is moved forward toward the tank 1 by the retracting motion of an air cylinder 13 to press a backing plate 12 to a weight 9. The weight 9 turns counterlockwise to open a sand take-out port 3 thereby taking out the sand under treatment onto a receiving tray 11. The cylinder 13 is then extended to return the weight 9 to the home position and at the same time the tray 11 is moved to right under a photodetector 14 while the sand on the tray 11 is leveled off by a scraper 19. The light detected by the photodetector 14 is transmitted to a colorimetric color difference meter 16 by which the light is analyzed and the spectral reflectivity thereof is determined. The measured reflectivity is operated relationally with the preliminarily stored spectral reflectivity of the sand having desired quality in a control device 18 and the treating condition is decided.

Description

[Detailed description of the invention] The present invention relates to a method for determining recycled foundry sand and an apparatus therefor.

Conventional methods for regenerating foundry sand include: ■ Colliding old sand against an impact plate using high-pressure air or mechanical methods to remove impurities from the surface of sand particles; ■ Rubbing old sand together using high-pressure air or mechanical methods. There are methods such as colliding and reproducing.

However, these methods have the disadvantage that it is not possible to quantitatively measure the degree of regeneration of the treated sand and to keep the properties, quality, etc. of the sand constant just by treating it for a set time or according to a process. Therefore, if the properties and quality of the sand to be treated change, the properties and quality of the recycled sand will also change accordingly.If the recycled sand is used for molding, the strength of the mold may not be obtained or various defects may occur. I was doing things.

The present invention has been made in view of these problems, and provides a recycled casting that can always keep the properties, quality, etc. of recycled sand constant even if the properties, quality, etc. of the sand to be treated change. The object of the present invention is to provide a method and device for determining sand.

The configuration of the present invention will be explained below based on examples. (1
) is a hopper-shaped treatment tank for regenerating foundry sand. A discharge pipe (2) is connected to the lower end discharge port (lυ), and a sand outlet (3) is provided on the inclined wall to take out the sand to be treated for sampling. (4) is a support shaft rotatably supported in a shaft hole drilled in a support bracket (5) protruding from the outer wall surface of the processing tank (1), and the negative side of the support shaft (4) The base end of the support arm (6) is fitted into the support arm (6), and a spherical lid member (7) is fixed to the tip of the support arm (6), and the lid member (7) is centered on the shaft hole. The sand outlet (
3) J is provided so that it can be closed. The support shaft (
4) A support arm (8) is fitted on the other side of the support arm (8).
A weight (9) is fixed to the tip of the support shaft (4) facing the lid member (7), and the support shaft (4) is normally rotated clockwise around the shaft hole 1 by this weight (9) to remove sand. Outlet (3)
is closed by a lid member (7).

(10) has a tray (11) for receiving the sample sand taken out from the sand outlet (3) and a backing plate (12) that can come into contact with the weight (9), respectively, placed on the upper surface; The support plate (10) is fixedly supported by an air cylinder (13) fixedly supported by a fixing member (not shown) via a rear cover.
) is fixedly connected to the tip of the piston rod (13a), and when the air cylinder (13) retracts, the support plate (10) moves linearly in the horizontal plane in the direction of the processing tank (1), and the receiving tray (11) is positioned directly below the sand outlet (3), and the backing plate (12) is placed in contact with the weight (9). (14) is the saucer (1) in the retreated position.
1) with the light receiving part facing the saucer (11).
This light receiver (14) is connected to a colorimetric colorimeter (16) through a conductor (15), and the colorimeter (16) is connected to a control device through a conductor (17). (18)
The light from the sand taken out onto the saucer (11) is received by the light receiver (14), and this received light is sent to the colorimeter (16) and analyzed to detect the sand. Spectral reflectance is measured. Furthermore, this spectral reflectance is transmitted from the colorimeter (16) to the control device (18) via the conductor (17).
It is compared with the spectral reflectance of sand of the desired quality and stored in advance, and if it is within the allowable range, the processing of the sand in the processing tank (1) is completed, and if it is outside the allowable range. After continuing the sand treatment for a predetermined period of time, some sand is taken out from the sand outlet (3) again, and the spectral reflectance of the sand is compared with the pre-stored spectral reflectance in the same way as above, and the calculation is made to determine the acceptable value. If it is within the range, sand processing will be completed.゛And if it is still outside the allowable range, the above operation is repeated again, and when the sand falls within the allowable range, the sand treatment is completed.

Note that (19) is a scraper whose lower end surface is provided at approximately the same height as the upper side of the tray (11), and the tray is provided so as to evenly level the sand on the upper side of the tray (11).

Next, the operation of the device configured as described above will be explained. When the time for sand processing in the processing tank (1) is reached, the air cylinder (13) is retracted and the support plate (1)
0) forward in the direction of the processing tank (1) and press the backing plate (12).
is brought into contact with the weight (9), and the weight (9) is rotated counterclockwise around the shaft hole of the support shaft (4) to open the sand removal port (3) and open the sand removal port (3). A predetermined amount of sand being processed is taken out from the sand take-out port (3) onto the saucer (11) located directly below.

Next, by the expansion operation of the air cylinder (13),
Move the support plate (10) backwards and remove the support plate (10) from the weight (9).
2) and rotate the lid member (7) clockwise around the shaft hole to close the sand outlet (3) with the lid member (7) and place the saucer (11) filled with sand into the light receiver ( Move backward to the position directly below 14). In addition, during this backward movement,
The sand above the saucer (11) is leveled by a scraper (19) to the same height. The sand on the saucer (11) is received by a light receiver (14) provided facing the saucer (11), and the received light from the sand on the saucer (11) is colorimetrically measured by the light receiver (14). It is transmitted to a color difference meter (16) and analyzed to determine the spectral reflectance. Furthermore, the spectral reflectance of this sand is transmitted to the control device (18) and compared with the spectral reflectance of sand of a desired quality stored in advance and calculated. If the result is within the allowable range, the processing tank (18) ) to complete the sand treatment. In addition, if it is outside the allowable range, continue the sand treatment operation and wait until the specified time has elapsed before using the air cylinder again.
13), the support plate (10) is moved to the processing tank (1).
Move the backing plate (12) to the side and abut the weight (9), and rotate the weight (9) counterclockwise around the shaft hole of the support shaft (4) to open the sand outlet (3). When opened, the saucer (11
) is positioned directly below the sand outlet (3) to discharge a predetermined amount of sand from the sand outlet (3) onto the tray (11).

Thereafter, the support plate (lO) is moved backward by the extension operation of the air cylinder (13), and the backing plate (12) is placed under the weight (9).
) and place the saucer (11) filled with sand directly below the light receiver (14), and the light from the sand on the saucer (11) received by the light receiver (14) is sent to the colorimeter (16). It is transmitted, analyzed, and the spectral reflectance is determined. Furthermore, this spectral reflectance is sent to the control device (18) and compared and calculated with the spectral reflectance of sand of the desired quality stored in advance, and if it is within the allowable range, the spectral reflectance of the sand in the treatment tank (1) is Complete the process.

If it is outside the allowable range, the sand treatment operation is continued again for a predetermined period of time in the same manner as described above, and then the quality of the sand is determined to determine whether to continue or complete the sand treatment operation.

By repeating such operations, when the quality of the sand to be treated falls within an acceptable range, the sand treatment operation is completed.

As is clear from the above explanation, according to the present invention, even if the quality, properties, etc. of the sand to be treated change, the quality etc. of the recycled sand can be maintained at a constant level. It has the effect of enabling efficient production, and its contribution to this type of industry is significant.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention, and FIG. 2 is a side sectional view of FIG. 1. (1): Treatment tank (3): Sand outlet

Claims (1)

[Claims] 1. Part of the sand being treated in the treatment tank is taken out of the treatment tank and the spectral reflectance of the sand is measured, and the spectral reflectance and the sand of the desired quality are measured. A method for determining recycled foundry sand, comprising comparing and calculating the spectral reflectance and determining the treatment state of the sand to be treated. 2. At the bottom of the treatment tank (1) there is a sand outlet that can be opened and closed (
3), and a saucer (11) is provided directly below the sand outlet (3).
) is provided so that people can freely move in and out, and a light receiver (14) is placed directly above the retracted position of the receiver (11) to face the receiver (11). A device for determining recycled foundry sand, characterized in that it is electrically connected to a color difference meter (16) and a control device (18), respectively.