JP2002210540A - Compressed air flow monitoring system for green molding equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressed air flow monitoring system in a green molding facility capable of predicting a failure inside a compressed air tank and performing maintenance of the compressed air tank when the operation of the facility is stopped. . SOLUTION: A noise value of a compressed air tank and a frequency analysis value thereof in a normal state in a molding sand pre-compression step are stored in a computer in advance, and the stored value and the actual value are stored in an actual pre-compression step. The computer calculates and compares the noise value of the compressed air tank and the frequency analysis value generated by the computer, and if the result is out of the allowable range, a maintenance warning of the compressed air tank is issued as an abnormality.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for monitoring the flow of compressed air supplied from a compressed air tank in a so-called "static molding apparatus (hereinafter referred to as a green molding apparatus)".

[0002]

2. Description of the Related Art Conventionally, in a green molding apparatus, a casting flask and a pattern are used.
After the molding sand is supplied into the space defined by the template, the compressed air stored in the compressed air tank is passed through the supplied molding sand to pre-compress the molding sand. At the same time, the pre-compressed molding sand is squeezed by pressurizing means to form a mold.

[0003]

On the other hand, in the green molding equipment, the molding sand is pre-compressed by passing compressed air through the molding sand. The passage of the compressed air (preliminary compression) is performed by molding. Since it greatly affects the quality of the mold to be manufactured, maintenance such as replacement, renewal, and cleaning of each part in the compressed air tank is important. However, since the compressed air tank is closed, it is difficult to find out any problems inside the tank.In practice, if an abnormality is seen in the state of the molded mold, the entire equipment is shut down and compressed. The air tank is disassembled for maintenance. Therefore, there is a problem in that the equipment that is in operation is stopped, thereby reducing productivity.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been made in view of the above problem. An object of the present invention is to provide a compressed air flow monitoring system.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, a system for monitoring the flow of compressed air in a green molding apparatus according to the present invention comprises a space defined by a casting flask and a pattern plate. After the molding sand is supplied, the compressed air stored in the compressed air tank is flowed through the supplied molding sand to pre-compress the molding sand and add the pre-compressed molding sand. A compressed air flow monitoring system in a molding machine for molding a mold by squeezing a mold by a pressure means, wherein a noise value and a frequency analysis value of a compressed air tank in a normal state in the preliminary compression step are analyzed in advance. In the actual pre-compression step, the stored value is compared with the actually generated noise value of the compressed air tank and its frequency analysis value by the computer, and the result is calculated as an allowable range. Characterized in that it has to emit maintenance warning of the compressed air tank as abnormal when it is.

[0006] Further, the compressed air flow monitoring system in the green molding equipment of the present invention is characterized in that the maintenance warning is displayed on a screen of a computer.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. In FIG. 1, a base 1 in the form of a platen
An upwardly extending cylinder 2 is attached to the center of the cylinder 2, and a vertically movable table 3 is fixed to the tip of the piston rod of the cylinder 2. A guide rod 4 is suspended from the lower surface on the right side of the lifting table 3, and the guide rod 4 is slidably inserted into a holder 5 mounted on the base 1.

Further, at the upper four corners of the base 1,
A platen 6 has a flanged roller conveyor 7 extending in the left-right direction between the middle positions, and a compressed air outlet 8 near the center between the upper ends. Each of the ceiling plates 9 is stretched. On the upper surface of the ceiling plate 9, there is provided a tank facility 11 which includes an opening / closing mechanism (not shown) for opening and closing the outlet 8 and forms a compressed air tank 10 with the ceiling plate 9.

A plurality of noise sensors 12, 12 are provided at substantially the middle position side of the compressed air tank 10 (a plurality of noise sensors are provided so that measurement can be continued even if one noise sensor 12 is damaged). The noise sensors 12 and 12 are electrically connected to a personal computer 14 as a computer via a sound level meter 13.

The personal computer 14 stores in advance the noise value of the compressed air tank and the frequency analysis value of the compressed air tank during normal operation in the precompression step, and stores the noise value during the actual precompression step. The calculated value is compared with the actually generated noise value of the compressed air tank and its frequency analysis value, and if the result is out of the allowable range, a maintenance warning of the compressed air tank is displayed on the screen as abnormal. I have. Further, the personal computer 14 can accumulate the data of the actual noise value of the compressed air tank and the frequency analysis value which are generated every moment during the operation of the green molding equipment.

In the drawing, reference numeral 15 denotes a frame surrounding the outlet 8, and reference numeral 16 denotes a pattern having a vent plug embedded in the surface.
Reference numeral 17 denotes a casting frame, and reference numeral 18 denotes a fill frame.

In the thus constructed apparatus, the opening 8 is opened by an opening / closing mechanism (not shown) in the compressed air tank 10 in the state shown in FIG.
And the casting sand S which is put into the space defined by the casting frame 17 and the filling frame 18. As a result, the compressed air flows downward from above the molding sand S and is discharged from the vent plug to perform preliminary compression of the molding sand.

At this time, the noise value of the compressed air tank actually generated and the frequency analysis value thereof are transmitted to the personal computer 14 through the noise sensors 12 and 12 and the sound level meter 13, and are transmitted to the personal computer 14. The comparator 14 performs a comparison operation with a normal value stored in advance. If the result is within the allowable range, the operation of the green molding equipment is continued, but if the result is outside the allowable range, a maintenance warning of the compressed air tank is displayed on the screen of the personal computer 14 as abnormal. I do.

For this reason, a maintenance warning is issued in a state where there is no abnormality in the molding mold but an abnormality is progressing in any part of the compressed air tank 10. Therefore, when such a maintenance warning is issued, the compressed air tank is not stopped immediately, but when the operation is stopped after a day's production is completed or when operation can be stopped for several days. By performing the maintenance of 10, the maintenance of the compressed air tank 10 can be performed systematically without stopping the mold making.

In the embodiment of the present invention, the abnormality of the noise value and the frequency analysis value of the compressed air tank 10 is displayed on the screen of the personal computer 14 as a maintenance warning. A warning may be sounded.

[0016]

According to the present invention, as is apparent from the above description, after the molding sand is supplied to the space defined by the casting flask and the pattern plate, the compressed air stored in the compressed air tank is supplied. Is passed through the supplied molding sand in a flowing air to pre-compress the molding sand and squeeze the pre-compressed molding sand by a pressurizing means to form a compressed air in a green molding apparatus. In the airflow monitoring system, the noise value of the compressed air tank and the frequency analysis value of the compressed air tank in the normal condition in the preliminary compression process are stored in advance in a computer, and the noise value is stored during the actual preliminary compression process. The calculated value is compared with the actually generated noise value of the compressed air tank and the frequency analysis value by the computer, and if the result is out of the allowable range, a maintenance warning of the compressed air tank is issued as abnormal. Because was so that, by predicting an abnormality in each part of the compressed air tank, the maintenance of the planned compressed air tank at the time of stopping of the equipment. Further, since the operation of the equipment is not suddenly stopped, the operation rate of the equipment can be greatly improved. In addition, since the maintenance warning is displayed on the computer screen, the equipment operator and maintenance personnel can quickly and easily find the abnormality and comprehensively manage the equipment including other abnormalities. There are various effects such as the ability to

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention.

[Explanation of symbols]

 10 Compressed air tank 14 Computer 16 Pattern plate 17 Cast flask

Claims (2)

[Claims] After supplying molding sand to a space defined by a molding flask and a pattern plate, compressed air stored in a compressed air tank flows to the supplied molding sand. A compressed air flow monitoring system in a green mold making facility for forming a mold by squeezing the pre-compressed molding sand by pressurizing means, while pre-compressing the molding sand by passing the sand; The noise value of the compressed air tank and the frequency analysis value of the compressed air tank at the time of normal are stored in a computer in advance, and in the actual pre-compression step, the stored value and the noise value of the compressed air tank actually generated and The frequency analysis value is compared and calculated by the computer, and when the result is out of an allowable range, a maintenance warning of the compressed air tank is issued as an abnormality, and the molding equipment is manufactured. Compressed air flow monitoring system. 2. The system according to claim 1, wherein the maintenance warning is displayed on a screen of a computer.