JPS5893540A - Control device for temperature of molding sand - Google Patents

Abstract

PURPOSE:To improve the productivity in casting and the quality of castings by supplying hot wind or cold wind from air flowing nozzles according to the temp. of the molding sand thereby controlling the molding sand to adequate temps. CONSTITUTION:When the molding sand charged from a charge hopper 11 for molding sand is of an adequate temp., the opening or closing plate 27 at the outlet of the 2nd chute 24 in succession to the 2nd discharge port 17 is opened. The molding sand is discharged from a control chamber 2 by the inclination of an angle or respose alpha. When the temp. of the molding sand is low, the outlet in succession to the port 17 is closed on receiving of the detection signal from a temp. sensor 12, and the opening and closing plat 27 at the outlet of the 1st chute 23 is opened. At the same time, an air control means 43 operates to open the 1st regulating valve 38 so as to operate a blower 6 and a heater 7. The hot wind blasted to a temp. regulator 1 via a heater 7 is blown through air flowing nozzles 20 into the chamber 2 to heat the molding sand. The hot wind is circulated through an air releasing port 9, and dust removers 5, 5. When the molding sand is high in temp., said sand is cooled with the atmospheric air passing through a fresh air introducing passage 42 and the waste air is discharged through an air releasing passage 40.

Description

[Detailed description of the invention] The present invention relates to a temperature control device for foundry sand.

The temperature of the foundry sand before molding is required to be adjusted to an appropriate range from the viewpoint of improving productivity and quality, for example, 20 to 90 degrees in the cold box method.

Conventionally, the temperature of the molding sand in each process of the casting line is controlled to ensure that the molding sand before molding is at an appropriate temperature. Temperature control is difficult because it is affected by the residence time in the molding sand storage section after the resin content has been removed. Furthermore, since foundry sand, including new sand and recycled sand, is affected by temperature differences between summer and winter, and changes in temperature between morning and afternoon, the temperature of foundry sand before molding cannot be kept constant, and the temperature of molding sand differs from the binder. There have been problems with crosstalk, moldability, and even an adverse effect on the quality of the cast product.

In view of the above, the present invention provides a large number of fluidized air nozzles at the bottom of a regulating section having a temperature regulating chamber for molding sand, and blows hot or cold air from the nozzles depending on the temperature of the foundry sand introduced into the regulating chamber. ? The present invention provides a temperature control device for molding sand that adjusts the temperature of molding sand to an appropriate temperature by blowing into a regulating chamber and then discharges the molding sand, thereby solving the above-mentioned conventional problems.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below based on embodiments with reference to the drawings.

In FIGS. 7 to 3, reference numeral 1 denotes a molding sand temperature adjustment machine, and a fluidizing air introduction part 4 is connected below the adjustment m5 forming a molding sand temperature adjustment chamber 2. 1 constitutes a circulation circuit 8 for circulating air together with a dust remover 5, a blower 6, and a heater 7, which will be described later. An inlet 10 for introducing molding sand is opened at the upper end of the side wall of the section 3, and a hopper 11 for charging molding sand is connected to the inlet 1o, and the temperature of the molding sand introduced into the popper 11 is measured. A temperature sensor 12 is provided.

In the adjustment section 5, an introduction path 15 for introducing the foundry sand falling from the inlet 10 into the adjustment chamber 2 is vertically formed with a partition wall 14 provided at the upper part thereof, and a sand input port 15 is formed at the lower end of the introduction path 1S. has been done. The upper part of the adjustment chamber 2 has a first discharge port 1.
6 is also provided with a second discharge port 17 at the bottom of the adjustment chamber 2, and the sand inlet 15 allows the foundry sand to flow through the sand inlet 1.
5, the position is set slightly lower than the first discharge port 16 so as not to be directly discharged to the first discharge port 16.

A bottom plate 19 is provided at the bottom of the adjustment section 5 to partition the adjustment chamber 2 and the introduction chamber 18 of the fluidized air introduction section 4, and a large number of fluidized air nozzles 20 are provided on the bottom plate 19. The fluidized air nozzle 20 of this example has a small diameter cylinder 21 with both terminals open in a hole penetrating the bottom plate 19, and a large diameter cover 22 with an open bottom end attached to the cylinder 21. The flowing air is configured to flow from the introduction chamber 18 through the cylinder 21f and into the adjustment chamber 2 from the lower end opening of the cover 22.

A first chute 25 and a first chute 24 are connected to the seventh discharge port 16 and the second discharge port 17, respectively, and a sliding opening/closing plate 27 is provided at the lower end outlet 25° 26 of both shoes 25 and 24. installed. That is, the opening/closing plate 27 is provided with an opening 28 in the center thereof.
Both shoes') 2! l.

It is slidably attached to a guide groove 29 formed at the outlet of the cylinder 24, and a piston rod 51 of a cylinder device 50 is connected to one end. Then, the cylinder device 50
is the temperature sensor 12 in the foundry sand charging hopper 11.
When the foundry sand is at an appropriate temperature, the opening 28 of the opening/closing plate 27 is opened at the 27th outlet following the second outlet 17. -) 24, and if the foundry sand is not at an appropriate temperature, open the opening 2 of the opening/closing plate 27.
8 faces the outlet 25 of the first chute 25 following the first discharge port 16, and the outlet 26 of the second chute 24 is closed.

Moreover, above the exits 25 and 26 of both the chutes 25 and 24, there is a temperature sensor 52 for measuring the temperature of the molding sand being discharged.
．． 52 are provided.

On the other hand, the introduction chamber 18 of the fluidized air introduction section 4 is provided with an inlet 18a for introducing fluidized air.

A sand discharge port 55 for cleaning is provided at the lower end of the introduction chamber 18, an opening/closing lid 54 is attached to the sand discharge port 55, and a piston/rod 56 of a cylinder device '55 is connected to the opening/closing lid 54. The opening/closing lid 54 is opened and closed by moving the piston/rod 56 back and forth. The above sand discharge port 55
faces above a hopper 57 for carrying out molding sand along with the exits 25 and 26 of the first chute 25 and the second chute 24, and the molding sand that has fallen from the hopper 67 is conveyed to the mold making machine by a conveyor. .

As shown in FIG. 9, the fluidized air circulation circuit 8 runs from an exhaust port 9 provided at the upper end of the adjustment section of the molding sand temperature controller 1 to an inlet 18a of the air introduction section 4, using a cyclone type dust removal circuit. The engine 5, a turbo blower 6, and a heater 7 are connected in order through pipes. In the circulation circuit 8, a first regulating valve 58 is interposed between both the dust removers 5, 5 and the blower 6, and a second regulating valve 58 is interposed between the first regulating valve 68 and the dust removers 5, 5. The exhaust passage 40 with the regulating valve 59 also includes:
Fresh air introduction passages 42 each having a third regulating valve 41 are connected between the first regulating valve 68 and the blower 6 . Also,
An air control means 45 is connected to the circulation circuit 8, and the air control means 45 controls the blower 6 and the heater 7 according to the temperature detected by the temperature sensor 12 provided in the foundry sand charging hopper 11 of the temperature regulator 1. Stop operation, heater 7
It is configured to adjust the temperature of the flowing air and to control the opening and closing of each of the regulating valves 5B and 59.41, thereby regulating the temperature of the flowing air.

In addition, in the figure, 44 is a heat insulating material for keeping the temperature regulator 1vi warm.

Next, to explain the operation, first, the hopper 1 for charging molding sand.
When the molding sand charged from 1 is at an appropriate temperature, the outlet 26 of the second sand 24 following the second discharge port 17 is opened, and the molding sand is poured from the lower end of the sand input port 15 in the adjustment section S. It flows out to the second outlet 17 at an angle of repose a, and flows into the first chute 25.
is discharged from the outlet 26 of the

When the temperature of the foundry sand is low, in response to the detection signal from the temperature sensor 12, the outlet 26 following the second outlet 17 is closed and the outlet 25 of the first chute 25 following the seventh outlet 16 is opened. Also.

The air control means 4S operates to open the first regulating valve 58,
The blower 6 and the heater 7 are operated, and the amount of heat of the heater 7 is appropriately set according to the temperature of the foundry sand. At this time, the second regulating valve 59 and the third regulating valve 41 are closed. The hot air blown to the temperature regulator 1 via the heater 7 is blown into the adjustment chamber 2 from the fluidized air nozzle 20, blows up the low-temperature foundry sand while heating it, and exits the heated foundry sand first outlet 16. Let it drain. Temperature regulator 1
, the exhaust gas with foundry sand discharged from the exhaust port 9 is separated from the foundry sand by a dust remover 5.5 and then sent to the blower 6 and heater 7 again.
Flows into the temperature regulator 1 via.

Conversely, when the foundry sand fed into the temperature regulator 1 is at a high temperature, the air control means 45 is activated, the first regulating valve 58 is closed, and the second regulating valve 59 and third regulating valve 41 are opened. At the same time, the blower 6 is operated and the heater 7 is turned on to the flow 4. No heating is performed; only moving air is passed through. The outside air introduced through the fresh air introduction path 42, that is, the cold air, passes through the blower 6 and the heater 7, flows into the temperature regulator 1, cools the molding sand, and discharges it through the first discharge port 16. . Exhaust gas discharged from the exhaust port 9 of the temperature regulator 1 passes through the dust remover 5 and is discharged from the exhaust path 40.

In the above embodiment, outside air is introduced into the circulation circuit 8 from the fresh air introduction path 42 by the blower 6 of the circulation circuit 8, but the fresh air introduction path 42 is connected to the downstream side of the blower 6 in the circulation circuit 8. Alternatively, a fresh air introducing blower may be separately provided to introduce outside air. Moreover, as fresh air, in addition to outside air, cold air cooled to below the outside temperature by a cooler may be introduced.

Therefore, according to the present invention, since it is possible to adjust the foundry sand to an appropriate temperature by supplying hot air or cold air from the fluidized air nozzle according to the zero temperature of the foundry sand, the foundry sand can be adjusted to an appropriate temperature without being affected by the outside temperature etc. Molds can be made using foundry sand, and the excellent effects of improving casting productivity and quality of cast products can be obtained.

[Brief explanation of drawings]

The drawings illustrate embodiments of the present invention, and FIG. 1 is a partially cutaway front view of a molding sand temperature regulator, FIG. 2 is a vertical sectional view of the same, and FIG. ■Cross-sectional view along the line, No. 9
The figure is a circuit diagram showing the overall configuration of a foundry sand temperature control device. 1...Temperature regulator, 2...Adjustment room, 6...
...Adjustment unit, 5...Dust remover, 6...Prower, 7...Heater, 8...Circulation circuit,
12... Temperature sensor, 15°... Sand input port, 16... First discharge port, 17...
Second discharge port, 20... Fluid air nozzle, 58.
...First regulating valve, 42... Fresh air introduction path, 4
3...Air control means

Claims (1)

[Claims] (1) A regulating section forming a temperature regulating chamber for molding sand, a number of fluidizing air nozzles provided at the bottom of the regulating section, and a first outlet for molding sand at the upper and lower parts of the regulating chamber, respectively. The second outlet is 1. In addition, a sand inlet is provided in the upper part of the adjustment chamber at a position lower than the first discharge port, and the air discharged from above the adjustment section is supplied to the fluidizing air nozzle via the dust remover, blower, and heater. A circulation circuit is formed, a fresh air introduction path is connected to the circulation circuit through a regulating valve, and a blower, a heater, and a regulating valve are controlled according to the temperature of the foundry sand introduced into the regulating chamber, and the flowing air is controlled. 1. A temperature control device for foundry sand, characterized in that it is provided with air control means for adjusting the temperature of the foundry sand.