CN202794145U

CN202794145U - Device for detecting waste gases generated in core molding and curing processes of resin-coated sand

Info

Publication number: CN202794145U
Application number: CN201220427306.1U
Authority: CN
Inventors: 熊鹰
Original assignee: CHONGQING CHANGJIANG MOULDING MATERIAL (GROUP) Co Ltd
Current assignee: Chongqing Changjiang River Moulding Material Group Co ltd
Priority date: 2012-08-27
Filing date: 2012-08-27
Publication date: 2013-03-13
Anticipated expiration: 2022-08-27

Abstract

The utility model relates to a device for detecting waste gases generated in core molding and curing processes of resin-coated sand. The device comprises a machine frame and a heating plate arranged on the machine frame, wherein a gastight bin cover is arranged on the heating plate and forms an inclosed accommodating bin together with the heating plate; a gas outlet is formed at the upper part of the gastight bin cover; the sensing head of a gas sensor with a data display function is communicated with the accommodating bin through the gas outlet of the gastight bin cover; the test end of a thermocouple and the heating end of an electric heating rod are respectively inserted into the heating plate; and the device further comprises a temperature controller which is electrically connected with the thermocouple and the electric heating rod respectively. The device provided by the utility model has the advantages of higher test efficiency and accuracy, reusability, simple structure and less investment.

Description

The pick-up unit of waste gas in a kind of coated sand coremaking solidification process

Technical field

The utility model relates to the pick-up unit of waste gas, is specifically related to a kind of pick-up unit of waste gas of emitting at solidification process for coated sand.

Background technology

The waste gas that the foundry resin precoated sand produces in core engineering application process, mainly caused because of the higher temperature effect in coremaking and casting process by novolac resin, the molecular resin thermal degradation of the lower molecular weight that wherein exists produces some lower-molecular substances, and be included in the resinite and distribute to environment with gaseous form after the remaining free phenol of complete reaction and free aldehyde are not heated, simultaneously under coremaking solidification temperature condition, the various little molecule curing reaction product that produces in resin and the latent curing agent urotropine generation solidify reaction process etc. distributes to environment with gaseous form, comprising the aldehydes that produces and ammonia etc.These gases can cause harmful effect to human body and environment.At present, the pick-up unit of the gaseous chemical component contents such as ammonia and formaldehyde in the waste gas that casting industry produces for resin coating sand core engineering application process, judge sometimes the smell size of the stench such as ammonia, formaldehyde class gas in the waste gas by people's sense of smell, the method is inaccurate and can't be quantitative, and ammonia, formaldehyde can threaten to the healthy of testing staff, so inadvisable.At present, in other field, the method of testing that is used for ammonia and formaldehyde mainly contains chemical analysis and chromatography etc., but the cycle of chemical analysis is long, chromatography instrument and equipment input ratio is larger, existing chemical analysis and chromatography are difficult to satisfy the demand of the each side such as environment, the management of casting industry rig-site utilization be effective, all are not suitable for casting industry.Development along with modern industry, the feature of environmental protection to coated sand engineering applied technical procedure requires more and more higher, must reach relevant emission standards, the detection method and the device that obviously solve the waste gas chemical composition content in the resin coating sand core application process are significant.Therefore, need to there be special testing fixture to detect the characteristic of getting angry of the chemical constitution (as: ammonia and formaldehyde) of precoated sand in core application process (comprising in the solidification process) waste gas.

Summary of the invention

The purpose of this utility model provides the pick-up unit of waste gas in a kind of coated sand coremaking solidification process, this device can be tested the gaseous chemical component content of the waste gas that coated sand emits in solidification process, the efficient that detects is higher, accuracy is higher, and can reuse, and simple in structure, less input.

The pick-up unit of waste gas in the coated sand coremaking solidification process described in the utility model comprises frame, is located at the heating plate on the frame,

One airtight storehouse cover is arranged on the heating plate, and this airtight storehouse cover cooperates the airtight accommodating storehouse of formation one with heating plate, and the top of covering in airtight storehouse is provided with the gas outlet;

The sensing head of one gas sensor that shows with data is connected with described accommodating storehouse by the gas outlet of described airtight storehouse cover;

The fire end of the test lead of one thermopair and an electrically heated rod inserts respectively in the heating plate;

Also comprise a temperature controller, described thermopair and electrically heated rod are electrically connected with temperature controller respectively.

The top middle part of described heating plate is provided with round boss, and the oral area of described airtight storehouse cover is provided with the step cutting pattern with described round boss corresponding matching, and is provided with O-ring seal between the radial fit face of described round boss and step cutting pattern.Prevent that gas from spilling from the cooperation place of airtight storehouse cover with heating plate, with accuracy and the reliability of guaranteeing to test.

Be provided with recording test time mechanism at device, when test ammonia or formaldehyde are got angry, can be according to harmful gas emissions such as the ammonia in the data acquisition coated sand isothermal curing process of getting angry of the different durations of record, formaldehyde, obtain the time distribution, use and labour protection provides the correlation technique parameter for coated sand coremaking engineering, be conducive to environmental protection and labour protection management and engineering construction; Secondly can also adjust different probe temperatures, to obtain the distribution parameter that the harmful gases such as the ammonia under different solidification temperature conditions, formaldehyde change with solidification temperature in the coated sand coremaking solidification process, reliable data supporting etc. is provided for new product, the new technology of coated sand, exploitation and the application of new material; At last, this device can be expanded, can all can be by the sensor quantitative test out discharged to airborne chemical substance with gaseous form from the coated sand material by heating up heating as long as belong to, only need gas sensor mechanism is disposed by required probing chemical gaseous phase material this moment, just can realize test purpose.

The beneficial effects of the utility model: this device can be tested the waste gas that produces in the application of coated sand core and the coremaking solidification process, as: gas forming amount height, gas forming amount and the characteristics of getting angry such as time relationship, gas forming amount and temperature relation of ammonia (comprising the gaseous state organic amine), formaldehyde (comprising gaseous aldehyde, ethers), hydro carbons (comprising the gaseous state phenols) etc., detection efficiency is higher, accuracy is higher, can reuse, and simple in structure, less input; This device versatility is better, only needs during test gas sensor mechanism is got final product by required probing chemical gaseous phase material configuration.

Description of drawings

Fig. 1 is structural representation of the present utility model.

Embodiment

Now by reference to the accompanying drawings the utility model is described in further detail:

The pick-up unit of waste gas in the coated sand coremaking solidification process as shown in Figure 1 comprises frame 1, is located at the heating plate 3 on the frame 1;

One airtight storehouse cover 5 is arranged on the heating plate 5, and this airtight storehouse cover 5 cooperates the airtight accommodating storehouse 6 of formation one with heating plate 5, covers 5 top in airtight storehouse and is provided with gas outlet 5-1;

The sensing head of one gas sensor 7 that shows with data is connected with accommodating storehouse 6 by the gas outlet 5-1 of described airtight storehouse cover 5;

The fire end of the test lead of one thermopair 9 and an electrically heated rod 2 inserts respectively in the heating plate 3;

Also comprise a temperature controller 10, this temperature controller 10 is with time parameter function PLC, and thermopair 9 and electrically heated rod 2 are electrically connected with temperature controller 10 respectively.

Further, the middle part is provided with round boss 3-1 on heating plate 3, is provided with step cutting pattern 5-2 with round boss 3-1 corresponding matching at the oral area of airtight storehouse cover 5, and is provided with O-ring seal 8 between the radial fit face of round boss 3-1 and step cutting pattern 5-2.

The utility model is like this work: tested coated sand is placed on the round boss 3-1 of heating plate 3, cover airtight storehouse cover 5, by temperature controller 10, electrically heated rod 2 and thermopair 9 cooperate the heating rate that needs by design (℃/min) heat up temperature stabilization with heating plate 3 in setting value ± 1 ℃, and use the characteristic of getting angry of the waste gas (as: ammonia or formaldehyde etc.) that the tested coated sand of gas sensor 7 records that shows with data emits under this temperature.

Claims

1. the pick-up unit of waste gas in the coated sand coremaking solidification process comprises frame (1), is located at the heating plate (3) on the frame, it is characterized in that:

One airtight storehouse cover (5) is arranged on the heating plate, and this airtight storehouse cover cooperates the airtight accommodating storehouse (6) of formation one with heating plate, and the top of covering in airtight storehouse is provided with gas outlet (5-1);

The sensing head of one gas sensor (7) that shows with data is connected with described accommodating storehouse by the gas outlet of described airtight storehouse cover;

The fire end of the test lead of one thermopair (9) and an electrically heated rod (2) inserts respectively in the heating plate;

Also comprise a temperature controller (10), described thermopair and electrically heated rod are electrically connected with temperature controller respectively.

2. the pick-up unit of waste gas in the coated sand coremaking solidification process according to claim 1, it is characterized in that: the top middle part of described heating plate (3) is provided with round boss (3-1), the oral area of described airtight storehouse cover (5) is provided with the step cutting pattern (5-2) with described round boss corresponding matching, and is provided with O-ring seal (8) between the radial fit face of described round boss and step cutting pattern.