JP3346719B2 - Raw sand kneading supply method and equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a method for kneading and mixing green sand for mixing and adjusting corresponding green sand to two different molding lines by using a single kneading machine and supplying the same to the respective molding lines. Related to the equipment for implementing.

[0002]

2. Description of the Related Art In some cases, sand used in two molding lines is separately kneaded and supplied by one kneader. In this case, if the molding method performed in each molding line is different,
The properties of the sand to be kneaded and adjusted, especially the compactability value (hereinafter referred to as the CB value) must be kneaded and supplied accordingly (for example, the sand for the blanking blow squeeze molding line has a CB value of 42 to 36%, Sand for line with high pressure frame is CB
Value 45-39%). Conventionally, in such a case, as shown in FIG. 2, a first hopper 12 is provided below a batch-type kneader 11, and a first belt feeder 13 which can be rotated forward and reverse is provided below the first hopper 12, Second hoppers 14A and 14B are provided below both ends of the one belt feeder 13, respectively, and the direction of rotation of the first belt feeder 13 is switched to cut and store sand having different CB values into the second hoppers 14A and 14B. Was. The sand stored in the second hoppers 14A, 14B is supplied to the second belt feeders 15A, 15A as necessary.
B, and the belt conveyors 16A and 16B supply the hoppers provided on a molding machine (not shown) of each molding line. By the way, it is general that the height of a normal molding machine is made as low as possible due to restrictions of a factory building or the like. Therefore, the hopper installed on the molding machine cannot be a hopper having a large capacity, and the capacity of the kneader is limited to about one batch. In order to respond to the short stop of the molding line,
In the kneading and supplying equipment having the above-described configuration, each second hopper 14
The capacity of A and 14B was such that two batches of the capacity of the kneader 11 could be stored.

[0003]

However, as described above, the CB value of the sand kneaded changes after passing through a number of steps such as twice storing the hopper and cutting out the belt feeder twice. Sometimes it deviated from the value. In addition, the increase in the number of devices naturally required a corresponding cost and maintenance. At the same time, this also caused the equipment size to increase. The present invention has been made in order to solve the above-mentioned problem, and has been developed by using one batch-type kneader.
Even when raw sands with different values are separately kneaded and supplied to different molding lines, the cost is low with the raw sand kneading and supplying method in which the CB value does not easily change in the storage and transport stages, and the equipment that implements the method. It is another object of the present invention to provide a sand kneading and supply facility that requires less maintenance and has a smaller size than before.

[0004]

In order to solve the above-mentioned problems, a method for kneading and supplying green sand according to the present invention comprises the steps of kneading and adjusting sand by one batch-type kneader to obtain green sand having different compactibility values. And a step of separately discharging the sand from the kneader in accordance with the kneaded and adjusted compactability value of the sand, and discharging the sand, and separately storing the sand discharged from the separate positions. And supplying the separately stored green sand to separate molding lines. Further, the fresh sand kneading supply equipment for performing the above fresh sand kneading supply method is provided with two sanding doors at an interval in one batch type kneader, and a hopper corresponding to a lower part of each sanding door. In addition to the arrangement, a belt feeder leading to a corresponding molding line is provided below each of the hoppers.

[0005]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a fresh sand kneading supply system according to the present invention. Reference numeral 1 denotes a batch type kneader, which is provided with two sanding doors 1A and 1B at the bottom of the container, and a CB value measurement water injection controller 2 is attached to the inner side surface of the container. The corresponding hoppers 3A, 3B are installed below the sanding doors 1A, 1B. The hoppers 3A and 3B have a capacity of two batches of the kneader 1, and level switches 4A and 4B are mounted on the side walls of the hoppers 3A and 3B at a level where fresh sand is deposited in an amount of one batch of the kneader 1. Have been.
A belt feeder 5A is provided below the hoppers 3A and 3B.
5B is provided. Reference numeral 6 denotes a belt conveyor that conveys sand before kneading that has been processed by a collected sand processing device (not shown), and reference numeral 7 denotes a hopper that stores the sand before kneading. 8
Reference numerals A and 8B denote belt conveyors which convey and feed the kneaded green sand to a hopper on a molding machine (not shown).

[0006] A method of kneading sand, adjusting the CB value thereof, and supplying it to the molding line by the raw sand kneading and supplying equipment configured as described above will be described below. The recovered sand processed to be usable by a recovered sand processing device (not shown) is conveyed by a belt conveyor 6 and stored in a hopper 7 on the batch type kneader 1. On the other hand, when the amount of green sand in the hopper 3A or 3B is reduced by half, a signal is issued from the level switch 4A or 4B, sand is put into the kneader 1 from the hopper 7, and water and a binder are further added. Kneading is performed.
The CB value of the sand during kneading is measured by the CB value measurement water injection controller 2. The CB value measurement water injection controller 2 sets two different CB value target management values in advance, and performs additional water injection to elaborate the target CB value. The green sand kneaded to the target CB value is the level switch 4
The sand opening door 1A (1B) that opens to the hopper 3A (3B) where A (4B) is installed is opened, and sand is discharged from the kneader 1 into the hopper 3A (3B) and stored. Thereafter, the belt feeder 5A is driven by a signal from a molding line (not shown).
(5B) is operated to cut out the raw sand in the hopper 3A (3B) and is supplied to a hopper on a molding machine (not shown) by a belt conveyor 8A (8B).

[0007]

The method for kneading and supplying fresh sand and the equipment for carrying out the method according to the present invention are apparent from the above description.
Two batching doors are provided in one batch-type kneading machine, and hoppers are provided at the lower part of each door to store fresh sand with different CB values and supply them to separate molding lines. In addition, the number of cutouts of the belt feeder is reduced by one step, so that the change in the CB value of the raw sand after kneading can be reduced. In addition, the reduction in the number of hoppers and belt feeders one by one leads to reduction in equipment cost and labor saving in maintenance work. Furthermore, by implementing the configuration of the present invention, the height of the equipment and the depth of the pits can be reduced, and the size of the equipment can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view of a fresh sand kneading supply facility showing an embodiment of the present invention.

FIG. 2 is a front view of a fresh sand kneading and feeding facility, showing an embodiment of the prior art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Batch-type kneader 1A, 1B Sand outlet 3A, 3B Hopper 5A, 5B Belt feeder

Claims (2)

(57) [Claims] 1. A step of kneading and adjusting sand by one batch-type kneading machine to obtain green sand having a different compactability value, and a step of mixing the sand from the kneading machine according to the compactability value of the kneading-adjusted green sand. A step of discharging sand with separate sand discharge positions, a step of separately storing fresh sand discharged from the separate positions, and a step of supplying the separately stored raw sand to different molding lines And a method for kneading and supplying fresh sand. 2. A single batch-type kneader 1 is provided with two sand-exiting doors 1A and 1B at intervals.
A fresh sand kneader characterized in that hoppers 3A, 3B corresponding to the lower parts of A, 1B are arranged, and belt feeders 5A, 5B leading to the corresponding molding lines are provided below the respective hoppers 3A, 3B. Supply equipment.