JPH11192532A - Casting sand recovery equipment - Google Patents

Abstract

(57) [Problem] To provide a molding sand collecting device capable of collecting and storing molding sand having different properties by being classified according to properties by a simple facility mechanism. SOLUTION: A small cutout hopper 4 having an overflow chute 4B is disposed above a sand storage hopper 3 whose interior is partitioned into three chambers 3A, 3B, 3C, and a lower portion of a sand discharge port 4A of the small cutout hopper 4. The conveyor belt 5 is disposed at both ends thereof, and both ends of the conveyor belt 5 are positioned above the chambers 3A and 3C at both ends of the sand storage hopper 3, and the lower end of the overflow chute 4B is located at the center of the sand storage hopper 3. A casting sand recovery device characterized in that it faces the upper part of the two chambers 3B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recovering molding sand obtained by crushing a casting mold (pouring) and crushing an unpoured sand casting mold (such as a poor molding mold). The present invention relates to a molding sand recovery device for sending molding sand stored as necessary to a kneading machine.

[0002]

2. Description of the Related Art Conventionally, foundry sand recovered by a belt conveyor for recovering foundry sand is thrown into a sand hopper from the center of a ceiling and stored. Foundry sand collected in this way is foundry that has been poured and contains a large amount of core sand in foundry factories that produce various kinds of small quantities, and that has been poured and contains almost no core sand. The casting sand crushed as it is not poured is irregularly sent, and is sequentially accumulated in a pile in the sand hopper. For this reason, the collected sand cut out from the bottom of the sand hopper is also cut out in the stacked order. On the other hand, it is important for the recovered foundry sand to uniformly mix and send out the foundry sand having a different mixing amount of core sand, unfilled foundry sand, and the like in order to obtain homogeneous foundry sand. In order to make the mixing ratio of the molding sands having different properties almost uniform, the sands having different properties are separately collected and stored in a plurality of sand hoppers, and each sand hopper is simultaneously cut out and operated as needed. In this way, molding sands having different properties are cut out, and these are mixed and sent out.

[0003]

As described above, when a plurality of sand hoppers are installed to homogenize molding sand cut out, there is a problem that equipment cost increases and a wide installation space is required. The present invention has been made in view of the above problems, and an object of the present invention is to provide a molding sand collecting device capable of collecting and storing molding sand having different properties by using simple equipment according to properties.

[0004]

Means for Solving the Problems To achieve the above object, the casting sand recovery apparatus of the present invention has its interior partitioned into three chambers of a first chamber, a second chamber and a third chamber in a lateral direction. Above the sand storage hopper, a cut-out small hopper provided with a sand discharge port at the lower end thereof and an overflow chute communicated with the upper surface thereof is disposed. A forward / reverse rotating belt conveyor facing the first chamber and the third chamber is provided, and the lower end of the overflow chute of the small hopper for cutting is made to face above the second chamber of the sand storage hopper. It is characterized in that the tip of a casting sand recovery conveyor faces upward.

[0005]

Embodiments of the present invention will be described below in detail with reference to the drawings. The interior of the first compartment 3A, the second compartment 3B, and the third compartment
A sand storage hopper 3 partitioned into three chambers 3C is provided, and the lower end of the sand storage hopper 3 has the three chambers 3A, 3B,
The lower end of 3C communicates with a common sand discharge port (not shown),
A cutting conveyor is arranged below the sand discharge port. Above the sand storage hopper 3, a sand outlet 4 is provided at the lower end.
A and a cut-out small hopper 4 having an overflow chute 4B communicating with the upper surface thereof is provided at appropriate intervals, and both ends of the sand storage hopper 3 are provided below the sand discharge port 4A. A forward / reverse rotating belt conveyor 5 facing above the first chamber 3A and the third chamber 3C is provided.
Furthermore, the lower end of the overflow chute 4B of the small cutting hopper 4 faces the second chamber 3B of the sand storage hopper 3 and the tip of the casting sand recovery conveyor 6 faces the small cutting hopper 4 above. I have. Reference numeral 7 in the figure denotes a hood.

[0006] In the case of such a construction, when the casting sand (a) which has been poured and the core sand of which mixing amount is small is conveyed by the casting sand recovery conveyor 6, the forward and reverse rotating belt conveyor 5 is used. The casting sand (a) which is rotated forward and sent into the cut-out small hopper 4 is cut out leftward in FIG. 1 and collected in the first chamber 3A of the sand storage hopper 3. When the casting sand (b), which has been poured and contains a large amount of core sand, is conveyed, the forward / reverse rotating belt conveyor 5 is rotated in the reverse direction and collected in the third chamber 3C of the sand storage hopper 3. Further, in the case where casting sand (c) in which core sand is not mixed and core sand is not conveyed is transferred, in the final stage of the recovery of the casting sand (a) or the casting sand (b), a forward / reverse rotating belt conveyor is provided. 5, the casting sand (a) or the casting sand (b) is cut out and left near the height of the connecting position of the small hopper 4 with the overflow chute 4B. Is cut out and received in the hopper 4. As a result, the foundry sand (c) sent into the cut-out small hopper 4 is collected from the overflow chute 4B into the second chamber 3B of the sand storage hopper 3.

[0007] When the collection sand (c) is collected by the collection conveyor 6 in this manner, the belt conveyor 5 is rotated forward and backward.
Is rotated in either the forward or reverse direction according to the molding sand (a) or the molding sand (b) remaining in the small hopper 4 and collected in the first chamber 3A or the third chamber 3C. 4 is emptied to prepare for the next casting sand collection. As described above, the three types of foundry sands (a), (b), and (c) having different properties are separated and collected in the first to third chambers 3A to 3C of the sand storage hopper 3, and the above-described first sand is used when necessary. The molding sand (a), (b) and (c) are cut out at a fixed ratio by a cutting conveyor (not shown) below the sand outlet common to the third chambers 3A to 3C, and cut out and conveyed to the kneading machine. . Therefore, the foundry sand that is cut out and conveyed to the kneading machine is always in a state in which three types of foundry sand having different properties are mixed at a fixed ratio.

[0008]

As is apparent from the above description, the present invention provides a simple equipment mechanism by combining a small hopper for cutting and recovering molding sand having different properties with an overflow chute and a forward / reverse rotating belt conveyor. By 3
There is an effect that the sand can be separated and stored in a sand storage hopper partitioned into chambers, and the casting sand divided into three types can be simultaneously cut out and sent out at a substantially uniform mixing ratio when necessary.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an outline of an embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrows AA in FIG.

[Explanation of symbols]

 Reference Signs List 3 Sand storage hopper 3A First chamber 3B Second chamber 3C Third chamber 4 Small cut-out hopper 4A Sand discharge port 4B Overflow chute 5 Forward / reverse rotating belt conveyor 6 Recovery conveyor

Claims (1)

[Claims] 1. A sand discharge port 4A is provided at a lower end of a sand storage hopper 3 above the sand storage hopper 3 which has a first chamber 3A, a second chamber 3B, and a third chamber 3C. A cut-out small hopper 4 having an overflow chute 4B communicated with the upper surface thereof is disposed, and a lower end of the sand discharge port 4A is provided with both ends facing above the first chamber 3A and the third chamber 3C of the sand storage hopper 3. A counter-rotating belt conveyor 5 is provided, and the lower end of the overflow chute 4B of the small cutting hopper 4 is made to face above the second chamber 3B of the sand storage hopper 3, and the casting sand is placed above the small cutting hopper 4. A casting sand collecting device, wherein the tip of the collecting conveyor 6 is exposed.