JP3405534B2 - How to treat recovered sand - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating recovered sand obtained by separating and collecting a green mold using a batch kneader. [0002] Conventionally, as one of the methods for treating recovered sand,
There is one disclosed in JP-A-61-14044. In this method, a predetermined amount of recovered sand cut out from a hopper is charged into a batch-type kneader while measuring the water content, so that the primary water is injected into the recovered sand as much as possible. . [0003] However, in the above-mentioned conventional method for treating recovered sand, in order to perform the primary water injection as much as possible, the recovered sand cut out from the hopper must be removed. In addition to measuring the water content, it is necessary to measure the weight of the recovered sand fed into the kneader. As a result, there is a problem in that the recovered sand processing equipment employing the conventional method has a complicated structure and is expensive. [0004] The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a facility having a simple structure, but making it possible to relatively easily bring the compactability value of recovered sand closer to a target value. An object of the present invention is to provide a method for treating recovered sand. [0005] In order to achieve the above object, a method for treating recovered sand according to the present invention is to dispose of a green mold and then recover the recovered sand by a batch-type kneader. A method of measuring the compactability value and moisture value of the recovered sand during kneading of the recovered sand by a batch-type kneader, estimating the moisture value of the subsequent recovered sand based on the measurement result, and calculating the estimated moisture value. And injecting as much primary water as possible into the subsequent recovered sand as primary water injection. [0006] The amount of water to be injected as large as possible as the primary water injection is targeted to be 80 to 90% of the amount required for fresh sand. An embodiment of the present invention will be described in detail with reference to FIG. After the belt feeder 1 and the bucket elevator 8 are driven for a required time, the collected sand in the hopper 2 is cut out and temporarily stored in the batch hopper 9, and is then charged into the kneading tank 4 of the kneading machine 3 in a predetermined amount. Next, after adding bendite and the like to the kneading tank 4, the kneading machine 3 is driven to knead the recovered sand,
Subsequently, a part of the recovered sand is taken out during the kneading, and the compactability value / water value measuring device 5 measures the compactability value and the water value of the recovered sand. Then
The measurement result is input to the controller 6, and the moisture value of the recovered sand is calculated and estimated with reference to data or the like obtained in advance, and the result is temporarily stored in the controller 6. Next, a calculation is performed in the same manner as described above.
The water injection device 7 is operated in accordance with the estimated water value based on the previous recovered sand that is estimated and stored in the controller 6, whereby the recovered sand being kneaded from the water spray nozzle 10 of the water injection device 7 is as much as possible. A large amount of water is injected as primary water injection. In addition, as the amount of water as much as possible, 80 to 90% of the amount required as fresh sand was injected. afterwards,
In order to make the compactability value of the collected sand as close as possible to the target value of fresh sand, the amount of water shortage is calculated by conventional means as necessary, and the water injection device 7 is operated to recover the collected sand during kneading. Water as the second water injection. In this way, after the compactability value of the recovered sand is made as close as possible to the target value, the recovered sand regenerated into predetermined green sand is discharged from the kneading tank 4. As is apparent from the above description, the present invention relates to a method for treating the recovered sand obtained by separating the green mold and collecting the same using a batch-type kneading machine. During the kneading of the recovered sand by the machine, the compactability value and the water value of the recovered sand are measured, and the water value of the subsequent recovered sand is estimated based on the measurement results. In addition, since as much primary water as possible is injected as the primary water injection, the recovered sand treatment equipment employing the present invention has a simpler structure than the conventional one, but has a compactability value of the recovered sand. Is relatively easy, and it is possible to reliably approach the target value.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic front view showing an embodiment of a facility for performing the method of the present invention. [Explanation of symbols]

Claims (1)

(57) [Claims 1] A method of treating a recovered sand obtained by separating and collecting a green mold by a batch type kneader, wherein the recovered sand is kneaded by the batch type kneader. Then, the compactability value and the moisture value of the recovered sand are measured, and the moisture value of the subsequent recovered sand is estimated based on the measurement results. Of recovered sand characterized by injecting water as primary water injection