JPH0128942Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a cooling device for cooling a cast product immediately after being removed from a mold, such as an aluminum cast product having a shell core.

BACKGROUND TECHNOLOGY As is well known, when casting products such as engine cylinder heads using shell cores, molten aluminum at a high temperature of about 700°C is poured into a mold formed by the core, metal mold, or sand mold. When the molten metal solidifies by cooling,
Mold removal, that is, removal of sand remaining on the core sand and casting surface after removal from the mold, and breaking off sprue strings, risers, frills, etc. that are unnecessary for the product. Move to the post-process of cutting.

By the way, even though this post-process is often done manually, the cast product is still at a high temperature of over 400℃ immediately after being removed from the mold, and it cannot be transported or manually transported. Cutting the sprue system as described above is both dangerous and extremely difficult. Therefore, the cast product immediately after being removed from the mold is forcibly cooled down to a temperature at which it can be manually worked on.

In order to perform this cooling, conventionally, air from within the factory is blown onto the hot castings using a ventilation fan to achieve air cooling.

In addition, the shell core remaining inside the cast product,
Residual sand on the surface of sand mold castings containing organic resin is
When the resin comes into contact with high-temperature aluminum during pouring, the resin components undergo thermal decomposition, which generates odorous gases such as ammonia, phenol, and cresol even during the cooling process. If this odorous gas is discharged outside the factory as it is, it will contribute to odor pollution, so conventionally all of the blown air containing this odorous component is deodorized using a cleaning tower, etc., and then Discharged outside the factory.

These conventional casting product cooling devices and air cleaning devices will be explained based on FIG. 6.

The cooling device main body 20 is formed of a steel plate in the shape of a tunnel, and the lower part thereof is formed in the shape of a hopper, and a casting product loading section 20a and a casting product discharging section 20b are provided at both longitudinal ends of the cooling device body 20, respectively. It is provided.

Inside this main body 20 is a roller conveyor 2 for conveying the cast products 22 loaded on a tray 21.
3 are arranged along the longitudinal direction.

Furthermore, a plurality of ventilation fans 25 are arranged at the top of the main body 20 for sucking factory air and blowing it to the castings 22 inside the main body 20. Item 22
A hood 26 for collecting air after cooling the
is connected to the upper part of the main body 20. A suction fan 26 is connected to this hood 26 via a duct 26a.
b is connected, and this suction fan 26b is
It is connected to a deodorizing device 27.

The cast product 22 includes a core made of sand solidified with an organic resin, and this resin component is thermally decomposed by the high-temperature cast product, producing not only a large amount of sand but also an odor.

The sand generated from this casting is collected by the hopper-shaped lower part of the body 20. A sand collection conveyor 28 for collecting this sand below the main body 20
By arranging this, it is possible to efficiently collect sand that falls while the casting is being transported. Further, the odor generated inside the main body 20 is discharged from the hood 26 to the duct 26a.
The odor components are removed by the deodorizing device 27 and discharged through the suction fan 26b.

The deodorizing device 27 is provided with a chemical circulation device 29 for removing odor components and a leak shelf 30 for promoting contact between the medicinal solution and the odor components.

Castings 22 sent from the castings loading section 20
While passing through the inside of the main body 20, the cast member is cooled by air blown by the ventilation fan 25, and is carried out from the other casting discharge section 20b of the main body 20.

Problems that the invention aims to solve However, in such conventional cooling devices, the air velocity of the ventilation fan is low at 2 to 6 m/s or less, and the cooling performance is low, so a very long cooling time is required. , there is a problem of poor work efficiency. In addition, in order to extend the cooling time in this way, it is necessary to lengthen the conveyor for conveying the castings inside the main body, which requires a larger cooling device itself, which also causes the problem of poor space efficiency. be. Furthermore, in the deodorization process using conventional equipment, all of the blown air is deodorized, so the deodorization process requires a large-sized device, which is problematic. There is also the problem that the power required for processing is extremely large, which is not desirable in terms of energy conservation.

The basic purpose of this invention is to solve the above problems, and it is possible to efficiently cool cast products, and to deodorize the odors generated during the cooling process with a minimum amount of power. The present invention provides a cooling device for castings.

Means for Solving the Problems In other words, in this invention, a main body with a closed structure is formed with an inlet part and an unloader part for the cast product, and the cast product is transported from a direction intersecting the conveyance direction of the cast product in the main body. A plurality of injection means for blowing cooling air toward A return duct for feeding this cooling device is connected to the cooling device, and there is also a circulation blowing means for blowing the air inside the main body toward the casting from a direction that intersects with the direction of conveyance of the casting, and for circulating this air. 1. A cooling device for castings, comprising: suction means for maintaining the vicinity of the carrying-in section and the carrying-out section below atmospheric pressure.

In addition, it is desirable that the return duct is connected to the upper part of the main body at a position biased towards the carry-in section.

Effect: According to this invention, high-speed air is blown by an injection means onto a cast product placed in a main body of a closed structure in which an inlet and an outlet for the cast product are formed, and the air is cooled. Since the air is circulated through the body, it is possible to efficiently cool the casting, and since a circulation blower is provided, this not only provides a cooling effect for the casting, but also activates the countercurrent flow of air inside the main body. Improves cooling efficiency of castings.

Furthermore, since a suction means is provided to maintain the vicinity of the loading and unloading sections of the main body at below atmospheric pressure, air containing odor components is prevented from leaking from the loading and unloading sections, and the suction means ,
Since the minimum amount of air containing odor components is sucked in and deodorized, the power required for deodorization can be minimized.

Note that if the return duct is connected to the upper part of the main body at a position biased toward the loading section, the higher temperature air heated by the casting can be cooled, so that the cooling efficiency of the casting can be further improved.

Example Examples of this invention will be described below.

The cooling device main body 1 is formed of a steel plate in the shape of a tunnel, and its lower part 1c is formed in the shape of a hopper, and at both ends in the longitudinal direction, there are a cast product loading section 1a and a casting product discharge section 1b, respectively. and is provided.

Inside this main body 1, a roller conveyor 4 is disposed along the longitudinal direction for conveying in steps (intermittently) a cast product 3 loaded on a tray 2 and containing a core made of sand solidified with an organic resin. has been done.

A cooling circulation device 5 is disposed above the main body 1, which blows cooling air and cools and circulates the air after cooling the cast product. A fan 5a
An air supply main duct 5b extending from the cooling circulation device 5 is placed directly above the main body 1 along the longitudinal direction of the main body 1, and its tip is closed.

A plurality of branch pipes 6 into which air blown from the cooling circulation device 5 flows are connected to the air supply main duct 5b directly above the main body 1, and the branch pipes 6 pass through the upper part of the main body 1. , the tip of which is located within the main body. An air distribution ratio adjusting damper 6a is provided inside the branch pipe 6 to adjust the amount of incoming air, and a blower which is an injection means for blowing air onto the casting 3 is provided at the tip of the branch pipe 6. The mouth 8a is connected.

Further, a circulation fan 7 is arranged directly above the main body 1, and the main body 1 is disposed on the ventilation side of the circulation fan 7.
An air duct 7a passing through the upper part of the air duct 7a is connected thereto, and an air outlet 8b is connected to the tip of the air duct 7a. Air inlet 7 is provided in the upper part of the main body 1 opposite to the injection direction of this outlet 8b.
b is formed, and this air inlet 7b is connected to the circulation fan 7 via a circulation duct 7c.

A circulation mechanism is formed by the circulation fan 7, the blower duct 7a, the air outlet 8b, the air inlet 7b, and the circulation duct 7c. .

Air outlets 8a and 8b arranged in this way
The air is blown out in the opposite direction.

It should be noted that these air blown portions are made to coincide with the stopping position of the cast product 3 during the step-like conveyance of the roller conveyor 4.

Further, in the upper part of the main body 1, a suction port 9 for sucking in the air blown out from the injection means and after cooling the cast product 3 is opened at a position biased toward the loading section 1a side. A return duct 10 is connected to the opening 9, and this return duct 10 is further connected to the cooling circulation device 5 to cool and circulate the air.

On the return duct 10 side of this cooling circulation device 5, a cooling coil 11 constituting a cooling device for cooling air whose temperature has risen due to cooling of the casting is arranged. ) is circulated and supplied through piping 11a.

Furthermore, a filter 12 is provided on the return duct 10 side of the cooling coil 11 to remove dust such as sand generated by cooling the cast product 3.

Furthermore, the loading section 1a and the loading section 1b of the main body 1
In the upper part of the vicinity of
That is, collection ducts 13 which are suction means for maintaining negative pressure are connected, and each collection duct 1
3 is connected to a duct 14, and this duct 1
4 is connected to a deodorizing device (not shown).

Next, the operation of this embodiment will be explained.

Castings 3 carried in from the castings carrying-in section 1a of the main body 1 are sequentially loaded on trays 2 and transported in steps inside the main body 1 by a roller conveyor 4. This step operation of the roller conveyor 4 is performed when the roller conveyor 4 is stopped.
The tray, that is, the cast product 3 is set to match the sprayed portion of the tray. Cooling circulation device 5
The cooling air sent from the fan 5a passes through the air supply main duct 5, and is branched into each branch pipe 6, and is controlled by the damper 6a for adjusting the air distribution ratio.
The amount of incoming air is adjusted, and the air is blown from each outlet 8a onto the cast product 3 at the stop position.

The air distribution ratio adjusting damper 6a adjusts the amount of air flowing into the branch pipe 6.

On the other hand, air (not cooled) is sent from the outlet 8b by the circulation fan 7 that circulates the air inside the main body 1, and is blown onto the casting 3 from the outlet 8b, cooling the casting and also blowing the air inside the main body 1. to create a countercurrent flow of air.

Since the air blown out from the blow-off ports 8a and 8b is sequentially directed in opposite directions, the countercurrent flow of air within the main body 1 is activated and the cooling efficiency of the cast product is improved.

A part of the air that has been blown onto the cast product 3 and cooled the cast product 3 is sucked in from the suction port 7b and circulated by the circulation fan 7, and the other air is passed from the suction port 9 through the return duct 10 again. It is sent to the cooling circulation device 5.

The cast product 3 includes a core made of sand solidified with an organic resin, and this resin component is thermally decomposed by the high-temperature cast product, producing not only a large amount of sand but also an odor.

Such sand becomes dust and is also included in the air sent from the suction port 9 to the cooling circulation device 5, and when such dust adheres to the cooling coil 11 in the cooling circulation device, heat is generated. Air containing dust is removed by a filter 12 before reaching the cooling coil 11, since this may reduce the exchange rate. The temperature of the air from which dust has been removed has risen due to the cooling of the casting 3, but it is cooled by the cooling coil 11 to which cooling water is circulated, and the casting 3 is further cooled by the fan 5a. The air will be blown into the body again and circulated.

In addition, most of the sand that does not turn into dust is collected by the hopper-shaped lower part 1c of the main body 1, and is efficiently collected at a fixed location by, for example, a sand collection conveyor 15 disposed below the main body 1. Ru.

The odor generated during this cooling process is sucked together with a small amount of air from the collection duct 13, and passed through the duct 14 to a deodorizing device (not shown).
Odor components are removed and e.g. discharged outside the factory.

Since the inside of the main body 1 is maintained at a negative pressure by the collecting duct 13, leakage from the outside of the main body 1, for example, the casting article loading section 1a and the casting article carrying out section 1b, is prevented.

The castings 3 are sequentially carried in from one longitudinal end of the main body 1, that is, the casting product carrying-in section 1a, and are cooled and deodorized, and then sequentially carried out of the main body 1 from the other side of the main body 1, that is, the casting product carrying-out section 1b. Ru.

Next, another embodiment of this invention will be described based on FIG. 2. In the circulating air blowing means of the above embodiment, a circulation fan 7 is disposed inside the main body to perform the circulation and air blowing functions. It is something.

FIG. 3 is a schematic diagram of still another embodiment, which has the same injection means and circulating air blowing means as the first embodiment. They are not connected in a biased position. In this way, the collection duct does not necessarily need to be connected at a position biased towards the carry-in side.

However, as shown in Figure 4, the temperature of the cast product decreases exponentially with respect to the cooling time.In other words, the amount of heat dissipated near the input section is large, but as it approaches the output section, the amount of heat dissipated decreases. Decrease. Therefore, by arranging the collection duct so as to be biased towards the loading section so as to further cool the air near the loading section, the cooling efficiency of the cast product can be improved.

Next, the effects of this embodiment will be explained by comparing this embodiment with a conventional example.

Figure 5 is a graph showing the relationship between the air blowing temperature and the cooling temperature at each air blowing speed. The total air volume can be sold.

Furthermore, by improving the cooling performance rate, it is possible to reduce the size of the device, and compared to a device that uses a conventional ventilation fan, this embodiment can reduce the size of the device to about 1/2. can.

Furthermore, in the conventional example, since it is desired to deodorize the entire amount of blown air, a large amount of power is required for this process. On the other hand, in this embodiment, the amount of air required to maintain the cooling device body at a slight negative pressure is sufficient, so the amount of air targeted for deodorization can be significantly reduced compared to the conventional example. The concentration of odor components is concentrated.

By the way, the concentration of odor components is on the order of ppb and is very dilute, so even if the odor concentration is concentrated, there is almost no change in the odor concentration of the air after deodorization treatment, and the air is not sufficiently cleaned. This means that

Therefore, the power required for the deodorizing process can be significantly reduced, and the overall power cost can be reduced to about 1/2 compared to the conventional example.

Effects of the invention As explained above, according to this invention, high-speed air is blown onto the casting placed in the main body of the closed structure in which the loading and unloading sections for the casting are formed. Since the air is circulated after being cooled, the air inside the main body is sufficiently counter-currently flowed, thereby increasing the cooling effect of the cast product and reducing the amount of air blown. Moreover, since the air inside the main body is circulated by the circulation blowing means and blown onto the casting to cool it, the air inside the main body is sufficiently agitated, improving the cooling performance of the casting.

This improved cooling performance makes it possible to downsize the device, improve space efficiency, and
Work efficiency is improved.

In addition, since a suction means is provided to maintain the vicinity of the loading and unloading portions of the main body below atmospheric pressure, air containing odor components is prevented from leaking from the loading and unloading portions, and air containing odor components is prevented from leaking from the suction means. Since the minimum amount of air containing odor components is sucked in and cleaned, combined with the reduction in the amount of air blown, the power required for cleaning can be significantly reduced to the minimum necessary, improving energy efficiency. It has the effect of

In addition, if this collection duct is connected at a position biased toward the carrying-in part side, the cooling efficiency can be further improved.

Furthermore, by arranging most of the injection means so that the injection direction is sequentially opposite to the conveyance direction of the casting, the air convection within the main body can be made more active, and the cooling efficiency of the casting can be improved. It can be further improved.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an embodiment of this invention.
A is a front sectional view, B is a side sectional view, Fig. 2 is a front sectional view of another embodiment, Fig. 3 is a front sectional view of another embodiment, and Fig. 4 shows the temperature and cooling time of the cast product. FIG. 5 is a graph showing the relationship between the air blowing temperature and the cooling time in relation to the air blowing amount. FIG. 6 is a front sectional view of a conventional cooling device. DESCRIPTION OF SYMBOLS 1... Cooling device main body, 2... Casting product, 5... Cooling circulation device, 5a... Fan, 8a, 8b... Air outlet, 11... Cooling coil, 13... Collection duct.

Claims (1)

[Claims for Utility Model Registration] (1) A main body with a closed structure is formed with an inlet part and an outlet part for the cast product, and is directed toward the cast product from a direction that intersects with the conveyance direction of the cast product in the main body. A plurality of injection means for blowing cooling air are arranged in the main body, and the injection means are communicated with one end of the cooling device through the blowing means, and the air inside the main body is sucked into the other end of the cooling device to perform this cooling. A return duct is connected to the device, and a circulation blowing means is arranged to blow the air inside the main body toward the casting from a direction that intersects with the direction of conveyance of the casting, and to circulate this air. 1. A casting product cooling device, further comprising suction means for maintaining the vicinity of the carrying-in section and the carrying-out section below atmospheric pressure. (2) The casting product cooling device according to claim 1, wherein the return duct is connected to an upper part of the main body at a position biased toward the carry-in section.