JPH0618689Y2 - Casting cooling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a cooling apparatus for a casting.

(Prior Art) When a casting is cast, mold sand adheres to the casting. As a means for removing the molding sand from the casting, as disclosed in Japanese Patent Laid-Open No. 58-25860. It is generally known that a casting is supplied to a heating furnace and the binder that solidifies the sand is vaporized by the heat in the heating furnace to be removed.

By the way, there is known a cooling treatment apparatus which, after casting, supplies a casting to a heating furnace to heat the casting, and then puts the casting into a stored liquid in a cooling tank for cooling (quenching). In this cooling treatment device, in the cooling tank, in addition to the original heat treatment (quenching), the mold sand can be dropped from the casting by thermal shock, and the casting sand can be cast more effectively than the above-mentioned mold sand removing means. It is supposed to be removed from. Moreover, in this cooling treatment device, since it is necessary to recover and reuse the sand removed (settled) in the cooling tank, a liquid / solid separation tank is provided, and the inside of the cooling tank The stored liquid is supplied by a pump, the supplied liquid is separated into sand and a clarified liquid in the liquid / solid separation tank, and the sand is recovered, while the clarified liquid is refluxed into the cooling tank.

Such a cooling treatment apparatus is individually prepared according to the type, material, etc. of the casting, because the heat treatment conditions (set temperature of the stored liquid) are different if the type, material, etc. of the casting are different. However, individually providing the cooling treatment device for each type and material of casting results in an increase in size as a whole, and the installation area must be considerably large.
Therefore, in order to reduce the overall size as much as possible, paying attention to the fact that the liquid / solid separation tank does not affect the cooling process, aiming to share (unify) the liquid / solid separation tank,
A cooling treatment device has been proposed in which the stored liquid in each cooling tank is supplied to each single liquid / solid separation tank by each pump, and after the sand separation, the clarifying liquid is returned to each cooling tank by a reflux pipe. ing.

(Problems to be solved by the invention) However, in the above-mentioned device, the stored liquids having different temperatures are mixed in the liquid / solid separation tank, and the temperature of the clear liquid from the liquid / solid separation tank is different from each other. It will be different from the set temperature of the stored liquid in the cooling tank. Therefore, when the clarified liquid flows into the stored liquid having a set temperature higher than the temperature of the clarified liquid, the calorific value of the stored liquid moves to the clarified liquid, and the temperature of the stored liquid decreases. When flowing into the stored liquid having a set temperature lower than the temperature of the clarified liquid, the heat amount of the clarified liquid moves to the stored liquid and the temperature of the stored liquid rises.

In this case, in the former case, the temperature of the stored liquid in the cooling tank according to the former case is higher than the set temperature due to the heat quantity of the casting when the casting is charged, and the temperature of the fining liquid is charged in each cooling tank. Since the calorific value of the casting to be added is increased by being added to the refining liquid, the casting liquid approaches the lower side of the set temperature of the stored liquid in the cooling tank. For this reason, in the former case, the temperature of the stored liquid in the cooling tank decreases due to the inflow of the clear liquid into the cooling tank, but the temperature does not deviate much from the set temperature of the stored liquid in the cooling tank. Therefore, it does not cause much trouble. However, in the latter, the temperature of the stored liquid in the cooling tank according to the latter becomes higher than the set temperature due to the casting of the casting into the cooling tank, and the temperature of the fining liquid is added to each cooling tank. The amount of heat of the casting to be added is increased by being added to the refining liquid, and the temperature of the stored liquid in the cooling tank according to the latter depends on the amount of heat of the casting and the refining liquid introduced into the cooling tank It will be much higher than the set temperature. Therefore, in order to return the temperature of the stored liquid to the set temperature within a desired time, the temperature control capacity (cooling capacity) of the temperature control device must be made considerably large.

As a means for solving such a problem, in the above apparatus, each pump is stopped after a predetermined time has passed from the casting (after sand is discharged from the cooling tank) and only the stored liquid in each cooling tank is discharged. It is conceivable to adjust the temperature with a temperature controller.
According to this, since the refining liquid does not flow into each quenching layer, a portion corresponding to the amount of heat transferred between the refining liquid and the storage liquid in the cooling tank becomes unnecessary as the temperature control capacity, and the storage liquid It is possible to reduce the temperature control capacity of the temperature control device on the assumption that the temperature is returned to the set temperature within the desired time.

However, as mentioned above, if you stop the pump,
There is a risk that the sand in the pipe will settle down and clog the pump, causing a malfunction of the pump and making it impossible to re-supply the stored liquid to the liquid / solid separation tank.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a plurality of cooling tanks for storing stored liquids having different set temperatures and a liquid / solid separation tank, and to provide the liquid / solid separation tank and each of the cooling tanks. Between the tank and the tank, a pump for sending the stored liquid of each cooling tank to the liquid / solid separation tank and a reflux pipe for refluxing the clarified liquid from the liquid / solid separation tank into the cooling tank are independently provided. In a cooling treatment apparatus for castings, each of the cooling tanks is provided with a temperature adjusting device for adjusting the stored liquid in each cooling tank to a set temperature, without causing a malfunction of the pump. ,
It is to minimize the temperature control capacity of the temperature control device.

(Means and Actions for Solving Problems) In order to achieve such an object, in the present invention, there are provided a plurality of cooling tanks and liquid
A solid separation tank is provided, and between the cooling tank and the liquid / solid separation tank, a pump for sending the stored liquid of each cooling tank to the liquid / solid separation tank, and from the liquid / solid separation tank And a reflux pipe for refluxing the clarified liquid in each of the cooling tanks independently,
A cooling processing apparatus for castings, wherein each cooling tank is provided with a temperature adjusting device for adjusting the stored liquid in each cooling tank to a set temperature corresponding to each cooling tank. The downstream side and each of the reflux pipes are respectively connected via a switching mechanism, and each of the switching mechanisms is at least the pump downstream side and the liquid / solid separation tank for a predetermined time after casting is cast into each cooling tank. It is set so as to allow communication with the inside of the pump and allow communication only between the downstream side of the pump and the reflux pipe after the lapse of the predetermined time.

With the above configuration, after a predetermined time has elapsed after the sand has been discharged from each cooling tank, the stored liquid in each cooling tank circulates in the pump, the reflux pipe, and the cooling tank by forced circulation. Therefore, the clarified liquid does not flow into each cooling tank. Therefore, heat transfer does not occur between the clarifying liquid and the stored liquid in each cooling tank, and the temperature control capacity corresponding to that can be reduced.

Moreover, in this case, the pump is always operated, and it is possible to prevent the pump from being clogged with sand and thus causing malfunction.

Therefore, the temperature control capability of the temperature control device can be reduced as much as possible without causing the pump to malfunction.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In the figure, 1a and 1b are quenching tanks as cooling tanks,
Hot water 2a is stored in each quench tank 1a (1b) as a stored liquid.
(2b) is stored.

A basket 3a (3b) containing a casting (for example, a cylinder head) is placed in each of the hot water 2a (2b) for quenching the casting. The basket 3a (3b) containing this casting is warm water 2a.
As a step before entering the inside of (2b), it is sequentially supplied to the heating furnace 4a (4b), and the casting in the basket 3a (3b) is heat-treated under normal conditions in the heating furnace 4a (4b). It is supposed to be. Thereby, the casting sand is attached to the casting after casting, but a part of the casting sand is
Due to the heat in the heating furnace 4a (4b), the binder that solidifies the sand is vaporized and falls from the casting. After this heat treatment, the basket a containing the casting
(3b) is a lifting mechanism (only a part is shown in the figure) 5a
(5b) from heating furnace 4a (4b) to each quenching tank 1a
The hot water 2a of each of the quenching tanks is simultaneously guided in (1b).
The casting in the basket 3a (3b) is to be quenched by (2b).

The warm water 2a (2b) in each quenching tank 1a (1b) is
The set temperature is set differently depending on the type and material of the casting. In this embodiment, since JIS AC4D is used as the material of the casting in the basket 3a, the set temperature of the hot water 2a is set to 85 ° C and the basket 3b is set.
Since JIS AC4B is used as the material of the casting inside, the set temperature of the hot water 2b is set to 65 ° C.

Above the plurality of quenching tanks 1a (1b),
A sand separation tank 6 is provided as a single liquid / solid separation tank. The sand separation tank 6 has a function of settling and separating the sand when hot water containing sand is supplied, and a function of causing the warm water itself to overflow in the overflow section 7 to be a clarified liquid. The sand is carried out of the sand separation tank 6 by the carry-out conveyor 8.

Pipes 9a (9b) are interposed between the sand separation tank 6 and the quenching tanks 1a (1b). One end of the pipe 9a is opened inside from the bottom of the quenching tank 1a, and the other end opening is directed downward above the opening of the sand separation tank 6. Similarly, one end of the pipe 9b is opened inside from the bottom of the quenching tank 1b, and the other end opening is directed downward above the opening of the sand separation tank 6.

A pump 10a (10b) is provided in each of the pipes 9a (9b). This pump 10a has a function of forcibly supplying the hot water 2a in the quenching tank 1a to the downstream side of the pump 10a and supplying it into the sand separation tank 6, and the pump 10b is the hot water in the quenching tank 1b. 2b to the pump 1
It has a function of supplying water to the downstream side of 0b and supplying it into the sand separation tank 6.

A reflux pipe 11a (11b) is interposed between the sand separation tank 6 and each quenching tank 1a (1b).
One end of the reflux pipe 11a is opened inside the overflow portion 7 of the sand separation tank 6, and the other end opening is directed downward above the opening of the quenching tank 1a. One end of the reflux pipe 11b is opened inside the overflow portion 7 of the sand separation tank 6, and the other end opening is directed downward above the opening of the quenching tank 1b.

Each of the quenching tanks 1a (1b) has a temperature controller 12a (12
b) are provided respectively. Temperature controller 12a (12
b) is a steam pipe 13a (13b) which is arranged so as to pass through the quenching tank 1a (1b) and through which steam flows.
A cooling pipe 14a (14b) which is arranged so as to pass through the quenching tank 1a (1b) and through which cooling water flows, and a steam pipe 13a (13b) and a cooling pipe 14a (14b), respectively. Flow control valves Vsa, Vwa (Vsb,
Vwb) and hot water 2a (2 in each quenching tank 1a (1b)
a temperature sensor 16a (16b) for detecting the temperature of b),
A control unit that adjusts the flow rate adjusting valves Vsa, Va (Vsb, Vwb) based on the temperature detected by the temperature sensor 16a (16b) to set the temperature of the hot water 2a (2b) of each quenching tank 1a (1b) to a set temperature. 17a (17b) and the temperature controller 12a heats the hot water 2a at 85 ° C.
And the hot water 2b is adjusted by the temperature controller 12b.
Is adjusted to be 65 ° C.

The downstream side of each pump 10a (10b) and each reflux pipe 11a (11b) are connected via a switching mechanism 19a (19b). In the present embodiment, each switching mechanism 19a (19b) includes a bypass pipe 18a (18b) and a bypass pipe 18a (18b).
It is composed of individual on-off valves 20, 21a (20b, 21b). The bypass pipe 18a (18b) is the pipe 9a.
The downstream side of the pump 10a (10b) of (9b) is connected to each of the reflux pipes 11a (11b). The on-off valve 20a (20b) is interposed in the bypass pipe 18a (18b), and the on-off valve 21a (21b) is connected to the pipe 9a (9b).
The bypass pipe 18a (18b) is provided on the downstream side (sand separation tank 6 side). Both on-off valves 20a,
The opening and closing of 21a (20b, 21b) is to be adjusted by a timer (not shown), and each quenching tank 1a (1
After the casting (basket 3a (3b)) is put into b), the on-off valve 20a (20b) is closed within a predetermined time.
The opening / closing valve 21a (21b) is opened, and after a predetermined time has elapsed, the opening / closing valve 20a (20b) is opened and the opening / closing valve 21a (21b) is closed.
The predetermined time is determined in consideration of the end of sand discharge from each quenching tank 1a (1b).

Therefore, in the above apparatus, after the heat treatment of the heating furnace, the casting (basket 3a (3b)) is put into each quenching tank 1a.
When placed in (1b), the mold sand adhering to the casting is removed from the casting by the thermal shock in the respective quenching tanks 1a (1b).
Will fall inside.

On the other hand, when this casting is introduced, the on-off valve 20a
(20b) is closed and the on-off valve 21a (21b) is opened. As a result, the warm water 2 in each quenching tank 1a (1b)
The a (2b) is supplied into the sand separation tank 6 by each pump 10a (10b), and the hot water 2a (2b) is mixed. The hot water 2a (2b) contains sand, and the sand separation tank 6
In the above, the warm water 2a, 2b is separated into sand 22 and a clarification liquid 23, the sand 22 is discharged to the outside of the sand separation tank 6 by the carry-in conveyor 8, and the clarification liquid 23 is passed through each reflux pipe 11a (11b). It is returned to the quenching tank 1a (1b).

In this case, the temperature of the clarifying liquid 23 is lower than the set temperature (85 ° C.) of the hot water 2a in the quenching tank 1a and higher than the set temperature (65 ° C.) of the hot water 2b in the quenching tank 1b. In the cooling water 1a and 1b, heat is transferred between the fining liquid 23 and the hot water 2a (2b) in each quenching tank 1a (1b), and the hot water 2a (2b) in the quenching tank 1a (1b) is generated. ) Temperature will deviate from the set temperature.

However, the open / close valve 20a (20b) is opened and the open / close valve 21a (21b) is closed after a lapse of a predetermined time after the sand is discharged from each quenching tank 1a (1b). Therefore, the hot water 2a (2b) in each quenching tank 1a (1b) circulates in the pump 10a (10b), the bypass pipe 18a (18b), the reflux pipe 11a (11b), and each quenching tank 1a (1b). As a result, the clarified liquid 23 becomes the reflux pipe 11a (11b).
It does not flow into each quenching tank 1a (1b) via the. As a result, for the quenching tank 1b, the clear liquid 3
Therefore, the cooling capacity can be reduced by an amount corresponding to the amount of heat transferred to the hot water 2b in the quenching tank 1b.

Regarding the quenching tank 1a, as described above in the prior art, the temperature of the hot water 2a in the quenching tank 1a does not become so low as to cause a problem with respect to the set temperature due to the inflow of the fining solution 23, but after a predetermined time has passed, Since the refining liquid 23 does not flow into the quenching tank a, the warm water 2 in the quenching tank 1a
The heating capacity can be further reduced by an amount corresponding to the amount of heat transferred from a to the clarification liquid 23.

In this case, since the pumps 10a (10b) continue to operate, the pumps 10a (10b) are not clogged with sand, which prevents the pumps 10a (10b) from malfunctioning.

Therefore, the hot water 2a (2
b) Assuming that the temperature is returned to each set temperature within a desired time, the temperature control capacity of each temperature control device 12a (12b) is reduced without causing malfunction of each pump 10a, (10b). Can be achieved.

Needless to say, if the present invention is applied, it is possible to shorten the time for returning the hot water temperature of each quenching tank 1a (1b) to the set temperature when the temperature control capacity up to now is taken as a reference. It will be possible.

The embodiments have been described above, but the present invention includes the following.

Not only two quenching tanks but more.

Open / close control of the open / close valves 20a, 21a (20b, 21b) is performed by detecting the sand concentration in the quenching tank 1a (1b).

The switching mechanism opening / closing valve includes a bypass pipe 18a (18b),
21a (21b). In this case, the reflux pipe 1
1a (11b) is preferably provided with a check valve that allows only the flow from the overflow section 7 to the quenching tank 1a (1b) on the sand separation tank 6 side of the bypass pipe 18a (18b).

Use an existing sedimentation separation device such as thickener for the sand separation tank 6.

(Effects of the Invention) As described above, the present invention is provided with a plurality of cooling tanks for accommodating stored liquids having different set temperatures and a liquid / solid separation tank.
Between the solid separation tank and each of the cooling tanks, a pump that feeds the stored liquid in each cooling tank to the liquid / solid separation tank, and the clarified liquid from the liquid / solid separation tank is refluxed into each of the cooling tanks. In a cooling processing apparatus for castings, a pump is provided in each of the cooling tanks independently provided with a temperature control device for adjusting the stored liquid in each cooling tank to a set temperature. The temperature control capability of the temperature control device can be minimized without causing a malfunction.

[Brief description of drawings]

 The drawing is an explanatory view showing an embodiment of the present invention.

Claims (1)

[Scope of utility model registration request] 1. A plurality of cooling tanks for accommodating stored liquids having different set temperatures and a liquid / solid separation tank are provided, and each cooling tank is provided between each cooling tank and the liquid / solid separation tank. The stored liquid
A pump for sending to the solid-separation tank and a reflux pipe for refluxing the clarified liquid from the liquid / solid-separation tank into the respective cooling tanks are independently provided. In the casting cooling treatment apparatus, each of which is provided with a temperature adjusting device for adjusting the stored liquid of the storage tank to a set temperature corresponding to each cooling tank, the pump downstream side and the respective reflux pipes form a switching mechanism. Each of the switching mechanisms is allowed to communicate with at least the pump downstream side and the liquid / solid separation tank for a predetermined time after the casting is put into each of the cooling tanks, and after the predetermined time has elapsed, Is set so as to allow only communication between the downstream side of the pump and the reflux pipe.