Shanxi Bureau of Quality Supervision checked 82 production units for unqualified pressure gauges and the detection rate was 25%
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[China Instrument Network Instrument Industry] Recently, the Shanxi Provincial Bureau of Quality and Technical Supervision announced the results of quality supervision and spot checks on 10 kinds of measurement products such as pressure gauges. A total of 129 batches of products from 82 production and distribution units were spot-checked, and 121 batches of inspections were qualified. Eight batches passed, and the unqualified detection rate was 6.2%.
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Among them, the unqualified detection rate of electronic truck scales, electronic belt scales, weighing displays, multimeters, heat meters, and blood pressure meters was 0; the unqualified pressure gauge detection rate was 25%, and the electric energy meter failed the detection rate. 6.7%, water meter unqualified detection rate was 4.5%.
Shanxi Province, measuring equipment product quality supervision and spot checks failed to identifysomeproducts and production and distribution company list
No.
product name
trademark
Specifications
Production date/lot number
Name of the manufacturer indicated
Inspection organization name
Failed items
1
Pressure gauge
Ronghua
Y-60 (0-1.6)mpa
2016.7
Shanghai Ronghua Instrument Factory
Taiyuan Jinyuan District Ronghua Instrument Distribution Department
Indication error
2
Pressure gauge
Ronghua
Y-100 (0-1.6)mpa
2016.6
Shanghai Ronghua Instrument Factory
Taiyuan Jinyuan District Ronghua Instrument Distribution Department
Overpressure test
3
Pressure gauge
/
Y-100(0-1.6)mpa
2016.7
Hangzhou East Asia Instrument Co., Ltd.
Shanxi Yukes Technology Co., Ltd.
Indication error
4
Precision pressure gauge
/
YB-150
2016.10.23
Yangquan Jingyi Precision Instrument Factory
Yangquan Jingyi Precision Instrument Factory
Overpressure test
6
Single-phase electronic prepaid meter
North Branch
DDSY195 10(40)A
2016.11.8
Hill Northwest Electronics Co., Ltd.
Hill Northwest Electronics Co., Ltd.
High frequency electromagnetic field without current - splash screen cannot be recovered
7
Three-phase electronic prepaid meter
North Branch
DDSY195 3*15(60)A
2016.11.21
Hill Northwest Electronics Co., Ltd.
Hill Northwest Electronics Co., Ltd.
High frequency electromagnetic field without current - splash screen cannot be recovered
8
Cold water meter
Ning Sheng
LXS-20F
/
Ningbo Jusheng Water Meter Valve Co., Ltd.
Taiyuan Jinyuan District Jinguang Sunshine Supply Station
Indication error
Shanxi Province, measuring equipment product quality supervision and inspection of qualified products and production and distribution company list
No.
product name
trademark
Specifications
Production date/lot number
Name of the manufacturer indicated
Inspection organization name
29
Pressure gauge
/
Y-100 (2.5mpa)
2016.8
Hangzhou East Asia Instrument Co., Ltd.
Shanxi Yukes Technology Co., Ltd.
30
General pressure gauge
Hengfeng
Y-100(0-1)mpa
2016
Hangzhou Fuyang Hengfeng Instrument Co., Ltd.
Taiyuan Jinyuan District Tongda Materials Distribution Office
31
General pressure gauge
Hengfeng
Y-100(0-1.6)mpa
2016.4
Hangzhou Fuyang Hengfeng Instrument Co., Ltd.
Taiyuan Jinyuan District Tongda Materials Distribution Office
32
Pressure gauge
/
Y-100 (1.6mpa)
16.8
Handan Huaning Instrument & Meter Co., Ltd.
Taiyuan Jinyuan District Luen Thai Instrument Supply Station
33
Pressure gauge
/
Y-100 (1mpa)
16.9
Handan Huaning Instrument & Meter Co., Ltd.
Taiyuan Jinyuan District Luen Thai Instrument Supply Station
34
Pressure gauge
red flag
Y-100(0-1)mpa
2016
Hongqi Instrument Co., Ltd.
Taiyuan Jinyuan District Hongqi Instrument Distribution Department
35
Pressure gauge
red flag
Y-100(0-1.6)mpa
2016
Hongqi Instrument Co., Ltd.
Taiyuan Jinyuan District Hongqi Instrument Distribution Department
Low-pressure casting was the earliest anti-gravity casting technology, which was first used in industrial production in the 1940s. Nowadays, low-pressure casting is mainly used in the production of aluminum alloy and magnesium alloy parts, such as the automotive hub of the automobile industry, the cylinder body, cylinder head, piston, missile shell, impeller, air guide wheel and other castings with complex shapes and high quality requirements.
The common material of low-pressure casting is A356\ZL101\ZL101A,this kind of material is usually applied to auto part, storage part,transformation part,etc.
The pressure on the surface of the molten metal is 0.06~0.12Mpa.This processing has good shrinkage, casting tissue is dense, easy to produce the large thin-walled complex parts, the casting head is not needed , metal yield can be up to 95%.
Low pressure casting can adopt sand type, metal type, graphite type, etc. The filling process is not only different from gravity casting such as metal casting and sand casting, but also different from high pressure and high speed filling pressure casting, which has the following advantages:
1) Pure metal liquid filling type, which improves the purity of the casting. Because the slag generally floats on the surface of the metal liquid, and the low pressure casting by the metal liquid in the lower part of the crucible realizes the filling through the lifting pipe, which completely avoids the possibility of the slag into the cast cavity.
2) The metal liquid filling type is smooth, reducing or avoiding the turnover, impact and splashing phenomenon of the metal liquid when filling the type, thus reducing the formation of less oxide slag.
3) The casting molding performance is good, the metal liquid filling under the pressure action, can improve the fluidity of the metal liquid, is conducive to the formation of clear outline, smooth surface casting, for the formation of large thin-wall casting is more favorable.
4) The casting crystallizes and solidifies under pressure, which can be fully condensed, and the casting structure is compact.
5) Improve the yield of metal liquid, generally do not need to burst, and the same metal in the lifting tube can be returned to the crucible, reuse, so that the yield of metal liquid greatly increased, the yield can generally reach 90%.
6) Convenient production and operation, good working conditions, high production efficiency, easy to achieve mechanization and automation.
Low pressure casting also has some disadvantages, equipment and mold investment is large; in the production of aluminum alloy casting, crucible and lift pipe long time with metal liquid contact, easy to erosion and scrap, will also make the metal liquid iron and performance deterioration.
Low-pressure casting was the earliest anti-gravity casting technology, which was first used in industrial production in the 1940s. Nowadays, low-pressure casting is mainly used in the production of aluminum alloy and magnesium alloy parts, such as the automotive hub of the automobile industry, the cylinder body, cylinder head, piston, missile shell, impeller, air guide wheel and other castings with complex shapes and high quality requirements.