Flaskless vacuum molding chamber temperature control circuit

A technology of temperature control circuit and box vacuum, which is applied in the direction of temperature control by electric mode, auxiliary controller with auxiliary heating device, etc., which can solve the problems of waste products, sand molds that cannot be hardened normally, and sand mold quality instability.

Inactive Publication Date: 2015-03-11
CHINA COAL ZHANGJIAKOU COAL MINING MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the daily production, the quality of the sand mold is unstable, especially in summer and winter, the sand mold cannot be hardened normally, resulting in a large amount of waste products

Method used

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  • Flaskless vacuum molding chamber temperature control circuit

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Effect test

Embodiment Construction

[0009] The safety vacuum chamber control principle of the embodiment of this circuit is: the input terminal SG1 comes from the output terminal of the temperature sensor SH05 (the output voltage is 0~5V between -10~+40°C). Based on the two years of operating experience, we set four operating points of 0°C, 10°C, 20°C, and 30°C, and respectively controlled four groups of working programs to operate at different temperatures within a year.

[0010] The connection relation of the described input signal part circuit is: the positive end of the voltage comparator IC1. that the input terminal SG1 connects LM224 to form, the negative end of the voltage comparator IC1. The negative end of the voltage comparator IC1 connects one end of the resistor K2 and the One end of the potentiometer RW1, the other end of the resistor K2 is grounded; the other two ends of the potentiometer RW1 are connected to the output end of IC1 to form a voltage amplifier IC1. The working principle of the voltag...

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Abstract

The invention relates to an electromechanical integrated device used for a vacuum molding chamber, and specifically relates to a vacuum molding chamber temperature control circuit. A conventional vacuum chamber for a cast steel molding sand-mold device in current production is a VRH automatic production streamline introduced from Japan, the vacuum chamber has a defect in design, i.e., temperature set control is lacked in the aspect of program control, and a sand mold cannot be normally hardened especially in summer and winter, causing numerous waste products. For the purpose of improving product quality, a vacuum molding temperature control circuit is brought forward in 2009. The input end SGI of the temperature control circuit is connected with the output end of a temperature self-sensing device SH05 (it has output voltage of 0V to 5V at a temperature from -10 DEG C to +40 DEG C), and the 0V to 5V voltage is converted into four control signal lines for inputting into a PC for respectively controlling four work programs to run at different temperatures in one year. Throughout several years, the operation effect is quite ideal, and the problem which is not solved by investing enormous manpower and material resources during these years is radically resolved.

Description

Technical field: [0001] The invention relates to an electromechanical integration equipment used in a vacuum molding room, in particular to a boxless vacuum molding room temperature control circuit. Background technique: [0002] In the current production, the vacuum chamber used for casting steel molding sand mold equipment is the VRH automatic production line imported from Japan. This equipment has a design deficiency, that is, it lacks temperature setting control in terms of program control. In the daily production, the quality of the sand mold is unstable, especially the sand mold cannot be hardened normally in summer and winter, resulting in a large number of waste products. In consideration of improving product quality, in 2009 we designed a vacuum molding room temperature control device. After several years, the effect has been proved to be very satisfactory. It has completely solved the problems that have not been solved by investing a lot of manpower and material ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D23/30
Inventor 张元泽张万壮李海付胜敏耿宝祥胡英杰
Owner CHINA COAL ZHANGJIAKOU COAL MINING MACHINERY
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