JPS5884667A - Separating and conveying device for molding sand and castings - Google Patents

Abstract

PURPOSE:To rationalize the recovering of molding sand and to improve the efficiency of casting work by separating the castings poured into sand molds and solidified and the molding sand, and transferring the molding sand along the inside wall surface of an outside rotary drum and the castings along the inside wall surface of an inside drum provided integrally in the outside rotary drum. CONSTITUTION:While castings 2 are shook out together with molds by the oscillations of an introducing conveyor 1, the castings are carried to the screening section 4 in an outside rotary drum 5. Since the section 4 is like a screen, only the molding sand drops and the castings 2 move and fall onto the castings receiving end part 13a of an inside drum 11. The products 2 are pushed by spiral feed vanes 15 in the drum 11 to an end part 13b. On the other hand, the molding sand 3 is agitated and cooled by the agitating plates 9 of the outside drum 5. The castings 2 drop from the part 13b onto the inside wall surface 5a of the drum 5 and are carried together with the molding sand to a molding sand discharging section 8, where the molding sand falls through slits 8a and the castings 2 are removed through a discharge port 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention separates the product poured into a sand mold and solidified from the molding sand that makes up the mold in the molding sand recovery process of foundry work, and efficiently collects the molding sand. This relates to a device for separating and conveying molding sand and products that can be cooled well.

The foundry sand used in casting is collected after each casting operation, processed to replenish any shortages, etc., and then reused. On the other hand, with regard to foundry sand, its material quality and stability, such as temperature, have an important influence on the soil used to cast good products.
It is desirable that the foundry sand whose temperature has been raised by pouring is cooled to about the same temperature as room temperature and then used for the next use.

Therefore, in the past, the poured and solidified product and the molding sand constituting the mold were introduced into a rotating drum in which a spiral feeding blade was formed in one of the curved pipes, and the product and the molding sand were introduced. The method used was to allow the products to cool naturally by rolling them together, and then to separate the product from the foundry sand.

However, with these conventional devices, there is a problem that the cooling efficiency is extremely poor because the molding sand to be cooled comes into contact with the product at a high temperature of 600°C to 7000°C, and it takes more than 20 m to cool to the required upper temperature limit. It is necessary to use a drum. 1.Instead of the natural cooling described above, it is also possible to cool the molding sand by sprinkling water or forcing cold air into it, but in this case, the product would also be rapidly cooled. Since so-called quenching will be performed, it will be difficult to carry out the next grinding process, etc.

The present invention has been made in view of the above points, and there is no risk that the molding sand after demolding will be heated by the heat of the product, and furthermore, the product will not be quenched even if the molding sand is sprinkled with water. The purpose of this is to provide a device for separating and conveying molding sand and products without the risk of being contaminated.

That is, the present invention includes a conveyor that conveys the product poured into a sand mold and solidified together with the molding sand constituting the mold, and a conveyor provided at the end of the conveyor to separate the product and the molding sand. A sorting section, an outer rotary drum that receives the foundry sand separated and dropped by the sorting section at one end of the inner wall section and transfers the foundry sand at the other end, and is integrally installed within the outer drum. an inner drum that receives the cured products from the sorting section at one end of the inner wall surface and transfers them at the other end 1; a drive motor that drives the outer rotary drum one rotation together with the inner drum; It is characterized by comprising the following.

Next, an embodiment of the molding sand and product separation/conveyance device according to the present invention will be described with reference to the drawings.

Figure 1 is a sectional view of the device according to the present invention, and Figure 2 is the same
3 is a perspective view showing the fitting of the outer rotary drum, and 1 in the figure shows the product 2 poured into a sand mold and solidified, and the molding sand 3 that made up the mold. This conveyor 1 is an oscillating conveyor that conveys by vibrating it along the direction of travel. At the end of the conveyor 1, a sorting section 4 for separating the products 2 and the molding sand 3 is continuously provided.
As shown in the figure, a large number of plates arranged in a slatted shape 4. One end of each of the plates 4a, 4a, . The terminal end of the conveyor 1 and the sorting section 4 receive the molding sand 3 separated and dropped by the sorting section 4 at one end of the inner wall section 5a, and at the other end, while stirring the foundry sand 3. The outer rotating drum 5 is located in the outer rotating drum 5 to be transferred, and in this embodiment, the outer rotating drum 5 is a cylindrical body with a diameter of 2.6 m and a length of about 5 m, with both ends constricted. ,
One end is a small-diameter introduction opening 6 into which the product 2 and foundry sand 3 are introduced. The other end of the outer rotary drum 5 has a slightly larger diameter than the introduction opening 6, and serves as a product discharge lower through which the product 2 is discharged. The molding sand discharge portion 8 formed by the molding sand discharge portion 8a has been completely formed. On the inner wall surface 5a of the outer rotary drum 5 between the introduction opening 6 and the discharge lower,
A spiral feeding blade 9 for moving the foundry sand 3 toward the discharge lower, and a large number of stirring plates 10, 10, etc. installed in a direction orthogonal to the rotational direction of the outer rotating drum 5 are provided, and further Inside this outer rotating drum 5,
An inner drum 11 receives the products 2 sent from the sorting section 4 at one end of the inner wall surface 11a and transfers them at the other end.
is provided. This inner drum 11 is a cylinder having a smaller diameter and shorter length than the outer rotating drum 5, and as shown in FIG. 2, the cross section of the inner drum 11 and the cross section of the outer rotating drum 5 are concentric. The outer rotary drum 5 and the inner drum 11 are fixed and integrated via the strut 2 so that the inner drum 11 is disposed at The lower discharge opening side is the product discharge end 13b. The above product receiving end 13
The terminal end of the sorting section 4 is located inside the inner drum 11 on the side a, and a slide tube 14 is provided on the outer periphery of the product discharge end 13b so as to be slidable along the axial direction of the inner drum 1. It is fitted. The end of the inner drum 11 is made expandable and retractable by this slide cylinder 14.
has a length that is substantially continuous with the discharge opening lower of the outer rotary drum 5 when extended. A spiral feeding blade 15 for moving the product 2 toward the lower discharge opening direction is formed on the inner wall surface of the inner drum 11. As shown in FIG. 3, a strip-shaped rail 16.16 is formed protruding from the outer peripheral wall surface of the outer rotating drum 5, and a strip-shaped gear 17 is also protruded from the outer peripheral wall surface of the outer rotating drum 5. At the bottom of 16, this rail 1
A support roller 18 is provided which is in contact with the outer rotating drum 6 and 16 and rotatably supports the outer rotating drum 5. Furthermore, regulating rollers J9 are provided before and after the rails 16 to restrict the movement of the outer rotary drum 5 in the axial direction by sandwiching the rails 16. It is connected via an endless belt 21 such as a chain, and the drive side boolean IJ 20 is connected to a drive motor 22.
It is fixed to the rotating shaft 22a of the rotary shaft 22a. The slit 8a is formed on the outer circumference of the outer rotary drum 5 on the discharge opening lower side.
An outer cylinder 23 formed separately from the outer rotary drum 5 is provided to surround the outer drum 5, and a lower edge portion of the outer cylinder 23 communicates with a receiving opening 24a of a molding sand discharge conveyor 24. This molding sand discharge conveyor 24 is an oscillator conveyor. Above foundry sand discharge conveyor 2
The terminal end of 4 is connected to the foundry sand conveyor 25 using a belt conveyor.
5 and the discharge conveyor 24 (!:) is provided with a temperature detector 26 for detecting the temperature of the molding sand 3, and a thermocouple is used as the temperature detector 26. A water sprinkling nozzle 27a of a water sprinkling pipe 27 is provided inside the introduction opening 6 on the 6 side, and the water spray nozzle 27a of the water sprinkling pipe 27 is adjusted based on the detected value of the temperature sensor 26. The water spray nozzle 27a is drawn into the drum 5 and is inserted into the inner wall surface 5a of the outer rotary drum 5 between the introduction opening 6 and the end 13a of the inner drum 11.
It is mounted towards. A plurality of water sprinkling pipes 27 are attached, and when the temperature of the foundry sand 3 that can be detected by the temperature detector 26 is high, water is sprayed from all the water sprinkling pipes, and when the temperature is lower, water is sprayed at that temperature. A control device (not shown) that controls water sprinkling from some of the water sprinkling pipes according to the temperature sensor 26 and the water sprinkling pipe 27
is established between.

Next, the operation of the device configured as described above will be explained.

First, the product 2 poured into a sand mold and solidified is placed on the introduction conveyor 1 together with the mold, as shown in Fig. 5 (
As shown in 5), the products 2 and molding sand 3 are conveyed while being broken up by the vibration of the introduction conveyor 1, and the products 2 and molding sand 3 reach the sorting section 4 in the outer rotary drum 5 together. This sorting section 4
Since the molding sand 3 has a slatted shape, only the foundry sand 3 falls from the sorting section 4 as shown in FIG. 13a
to fall. The product 2 that fell onto the product receiving end 13a is 11'l! The molding sand 3 that moves within the inner drum 1 by being pushed by the spiral feeding blades 15 in the drum 11, and falls onto the inner wall surface 5a of the outer rotary drum 5 from the sorting section 4, is The product 2 is moved without contacting the product 2 by being pushed by a spiral feeding blade 15 formed on the product 2 . Furthermore, the molding sand 3 that can be completely moved along the inner wall surface 53 of the outer rotating drum 5 is lifted by the stirring plate 9 along the rotational direction of the outer rotating drum 50 during its movement, and then falls. By repeating this process, cooling of the molding sand 3 progresses. When the product 2 is sent from the product discharge end 13b-7 of the inner drum 11, if the slide cylinder 14 is stored on the inner drum 11 side, the product 2 is delivered from the end 13b to the outer drum 5.
The molding sand 3 falls onto the inner wall surface 5a of the molding sand 3 and reaches the molding sand discharge part 8 together with the molding sand 3, and the molding sand 3 falls from the slit 8a of the discharge part 8, and the product is taken out from the lower part during product discharge. . Mixing the foundry sand 3 and the product 2 in the vicinity of the above-mentioned discharge lower is to clean the surface of the product with the foundry sand, creating a so-called sandblasting effect and to make the cast iron beautiful. This is to remove some of the sand stuck to Product 2. Since the contact between product 2 and molding sand 3 at this time is short, the temperature rise that molding sand 3 receives from product 2 is small, but if you want to avoid this temperature rise, If the inner drum 11 is substantially lengthened by pulling out the slide tube 14, the product 2 can be removed from the discharge lower without touching the foundry sand 3.

On the other hand, the molding sand 3 that has fallen from the molding sand discharge section 8 enters the molding sand discharge conveyor 24 through the receiving section opening 24a, and due to the vibration of this discharge conveyor 24, the molding sand conveyor 25
carried to. The temperature of the molding sand 3 dropped from the end of the discharge conveyor 24 onto the soil of the conveyor 25 is measured by a temperature detector 26, and when this detector 26 detects a temperature higher than the desired temperature. The pulp of the water sprinkling pipe 27 is opened and broken, and the outer rotating drum 5 is removed from the water nozzle 27a.
Water is sprinkled toward the inner wall surface 5a. By this water sprinkling, the foundry sand 3 is cooled at a speed several tens of times faster than natural cooling.In addition, the quick water sprinkling on the foundry sand 3 after the molding is done is because the molding sand 3 contains This will have a very positive effect on the binder used.

As explained above, according to the present invention, the product solidified by pouring into the sand mold is separated from the molding sand that constitutes the mold, and after separation, the molding sand is spread along the inner wall surface of the outer rotating drum. The structure is such that the product is piled up on the inner wall surface of the inner drum that is integrally provided in the outer rotary tram and is transferred, so that the molding sand after demolding is transferred to the 60% of the product.
There is an effect that there is no risk of the temperature rising due to the high temperature of 0 to 700°C, and as a result, the molding sand is efficiently cooled in the molding sand recovery process.

Furthermore, according to the present invention, even if the foundry sand is forcibly cooled by water sprinkling, there is no risk of quenching the product because it is separated, and there is no risk of difficulty in grinding the product in subsequent steps. This has the effect that the molding sand can be cooled in a short time. In addition, spraying water on the molding sand immediately after the mold is broken up has a very positive effect on the caking agent contained in the molding sand, and has various positive results. Furthermore, according to the present invention, since the cooling efficiency is good, the device can be configured with a relatively short cylinder, and it has a simple structure and requires no power other than the motor that rotates the outer rotating drum. Since the production cost and running cost are low, the effects obtained from the soil, which streamlines the molding sand recovery process and improves the efficiency of the casting operation, are extremely significant.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing an embodiment of the device according to the present invention, Fig. 2 is a cross-sectional view taken along the H-TJ line, Fig. 3 is a perspective view showing the external appearance of the outer rotating drum, and Fig. 4 is the outer side. Partially cutaway perspective view showing the vicinity of the introduction opening of the rotating drum, Fig. 5 GA) (
i3) (C) is an explanatory perspective view for explaining the function of the sorting section. 1... Conveyor, 2... Product, 3... Foundry sand, 4
... sorting section, 5 ... outer rotating drum, 11 ... inner drum, 22 ... drive motor.

Claims (3)

[Claims] (1) A conveyor that conveys the product poured into a sand mold and solidified together with the molding sand that makes up the mold, and a sorter installed at the end of this conveyor to separate the product from the molding sand. an outer rotary drum t which receives the foundry sand separated and dropped in the sorting part at one end of the inner wall part and transfers the foundry sand to the other end, and is integrally installed within the outer rotary drum. 41 of the products sent from the sorting department mentioned above.
Foundry sand and product characterized by comprising an inner drum that receives force at one end of one surface and transfers it to the other end, and a drive motor that rotationally drives the outer rotating drum together with the inner drum. separation and conveyance equipment. (2) The inner drum has a terminal end thereof that is extendable and retractable along the axial direction. (3) The outer rotating drum is one of the Y#ii
7. Near the inner wall of the outer rotating drum
A device for separating and conveying foundry sand and products according to claim 1, wherein a water sprinkling pipe having a t'd bottle nozzle is disposed.