JPS5829567A - Gas releasing device for casting installation - Google Patents

Abstract

PURPOSE:To control quantity of suction gas and to reduce the energy for driving power by detecting the quantity of the smoke produced in the metallic molds of casting machines and controlling the quantity of releasing gas of a gas releasing installation according to the quantity of the produced smoke. CONSTITUTION:Several units of metallic molds 1 of casting machines such as core molding machine or low pressure casting machines are installed, and capturing hoods 2 are provided to the respective molds. The gas releasing ducts 3 of the hoods 2 are gathered at one gas releasing duct 4, through which gases are sucked and released with a fun 5 provided in said duct. Temp. sensors or photoelectric tubes 6 are provided right above the respective machines 1, and detect the temp. elevation or the degradation in the transmittance of light when much smoke is produced, thereby detecting smoking conditions secondarily. Devices 7 for varying the quantity of gas consisting of motorized dampers or the like are provided to the respective ducts 3 and are connected electrically to the detectors 6. According to the degrees of smoking, the openings of the dampers 7 are controlled to large or small openings.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an exhaust system for casting equipment that achieves an energy saving effect by adjusting the amount of suction air.

Traditionally, core molding machines, low-pressure casting machines, etc. installed in foundries etc. emit smoke due to the combustion of shell sand resin during the production process, so as an environmental measure, collection hoods are installed to suck out the smoke-containing gas. It is collected and exhausted through an exhaust system.

In this case, the collection air volume should be set to
For example, in a core molding machine, the air volume is determined at the time of sand filling and opening of the mold, and the amount of air is always sucked at that amount.

However, in the production process, the time required to suck and collect at the maximum air volume is extremely limited, and constantly sucking at the maximum air volume as in the past leads to energy conservation and wasted power. Even though all of these machines do not require the maximum air volume at the same time because they are not operated, the conventional method of suctioning and collecting with the sum of the maximum air volume of each casting machine causes a large waste of energy. It becomes. Further, in the casting process, dust collection and deodorization equipment are often installed as a pollution control measure, but these post-processing equipment also increase in scale, leading to an increase in equipment costs.

The present invention focuses on the fact that the maximum air volume suction time of each casting machine is limited and that multiple casting machines installed are not operated in the same cycle. An object of the present invention is to provide an exhaust system for casting equipment that controls the exhaust air volume of a casting machine and reduces the total exhaust air volume when a plurality of casting machines are installed, thereby reducing power energy.

The exhaust system for the casting equipment of the present invention that meets this purpose includes a temperature sensing sensor or a photoelectric tube that is placed directly above the mold of the casting machine such as a core making machine or a low pressure casting machine, and that secondarily detects the amount of smoke emitted from the mold. The exhaust equipment is equipped with a variable air volume device, and the smoke detector and variable air volume device are electrically connected to control the exhaust air volume according to the smoke generation status of each casting machine. Consists of what was made.

Preferred embodiments of the exhaust system for casting equipment according to the present invention will be described below with reference to the drawings.

FIG. 1 shows an outline of the apparatus of this embodiment.
In the figure, casting machine mold 1 such as a core molding machine or a low pressure casting machine
A plurality of machines are installed, and each casting machine mold 1 is provided with a collection hood 2. Each collection hood 2 is provided with an exhaust duct 3, and these exhaust ducts 3 are gathered into one exhaust duct 4.
An exhaust fan 5 provided in the exhaust fan 5 sucks and exhausts smoke and the like collected by each collection hood 2.

Directly above each casting machine 1, a temperature sensing sensor or phototube 6 is provided. When the casting machine 1 generates a lot of smoke, the temperature rises in the position directly above it due to the high temperature of the smoke, and the transmittance of light decreases due to the smoke being filled. 6 to detect the smoke situation secondarily.

In addition, the exhaust duct 3 connected to each collection hood 2 includes
Each motor damper 7 is equipped with an air volume variable device 7 consisting of a motor damper, etc., and each motor damper 7 is electrically connected to the temperature sensing sensor or phototube 6, and when the smoke generation situation is large, the damper 7 is fully opened and the smoke is emitted. The opening degree is controlled so that when the situation is small, the opening degree of the damper 7 becomes small.

In the device configured as described above, power reduction is achieved as follows. In other words, as shown in Fig. 2, when collecting smoke generated from several molds of core molding machines or low pressure casting machines, etc., with conventional general smoke exhaust equipment, one
Each fan was required to have an exhaust air volume equivalent to the collection air volume corresponding to the maximum smoke generation tAK in one cycle plus the number of installed units, and the fan was required to have the ability to suck and exhaust that much air volume. In contrast, in the apparatus of the embodiment of the present invention, for example, in a core making machine, the collection air volume is increased only when there is a large amount of smoke, such as when pouring sand or opening the mold, and when firing the core, the collecting air volume is increased. When the amount of smoke generated is small, the amount of collected air is made small, thereby making it possible to make the average amount of collected air per cycle of one bogie φ equal to the amount of smoke generated B which is smaller than the amount of smoke generated iA,
The overall air volume can also be set to the exhaust air volume by adding the collection air volume corresponding to the smoke generation amount B for the number of installed units. That is, overall, the fan power cost can be reduced by reducing the amount of collected air by the amount of smoke generated by multiplying the amount of smoke generated by the difference C between the amount of smoke generated A and the amount of smoke generated B by the number of installed units. In addition, the capacity of the fan 5 is not required to be as large as in the past, as each casting machine is not operated in the same cycle and the times when the maximum collection air volume is required do not overlap, and the fan 5 is able to collect smoke in accordance with the amount of smoke B. It is sufficient to have the ability to suck and exhaust the air volume multiplied by the number of installed units.

The power reduction when collecting and exhausting 15 core molding machines was as follows. However, power reduction in post-processing processes such as deodorization equipment is not included.

As is clear from the table above, a large reduction in power costs can be obtained.

In the above embodiment, a motor damper is used as the air volume variable device, but the air volume variable device is not limited to the motor damper, and a variable air flow fan may be used as the air volume variable device. When using a variable airflow 1゛ fan, a smoke detector detects the smoke situation and sends a signal to the variable airflow fan to make the airflow variable, resulting in sufficient energy savings even for a single core making machine. It can be effective.

Therefore, when using the exhaust system for casting equipment of the present invention, the amount of collected air can be increased or decreased depending on the amount of smoke generated, and the smoke can be collected and exhausted with the minimum required amount of collected air, so that the power energy can be reduced. This can greatly contribute to energy conservation.

It is possible to reduce the scale of the exhaust fan, exhaust fan, and post-processing equipment, and also to reduce equipment costs.

[Brief explanation of drawings]

FIG. 1 is a schematic system diagram of an exhaust system for a casting facility according to an embodiment of the present invention, and FIG. 2 is a diagram showing the relationship between the casting process and the amount of smoke generated. The meanings of the main symbols in the figure are as follows. 1... Casting machine mold, 2... Collection hood, 3.4.
...Exhaust duct, 5...Exhaust fan, 6...Temperature sensing sensor or phototube, 7...Motor damper

Claims (1)

[Scope of Claims] (1) A smoke detector is installed directly in front of the mold of the casting machine, and a wind (JJ variable device is installed in the exhaust equipment) to control the amount of smoke detected by the smoke detector. Exhaust device if7 for casting equipment, characterized in that the smoke detector and the air volume variable device are electrically connected so that the exhaust air volume is controlled.
. (2. The exhaust system for casting equipment according to claim 1, wherein the smoke detector is a temperature sensor. (3) The exhaust system for casting equipment according to claim 1. (4) The exhaust system for casting equipment according to claim 1, wherein the air volume variable device is a motor damper provided in the middle of an exhaust duct. (5) In the exhaust system for casting equipment according to claim 1, the variable air volume device comprises a variable air volume fan.