HG 3094-1988 Method for measuring stack height of multi-layer lip seal assemblies for hydraulic and pneumatic applications HG3094-1988 Standard download decompression password: www.bzxz.net

UDC 678.4.03- 47 : 620.1
National Standard of the People's Republic of China
GB 9880 ---88
Alarm: G3op8
Multiple lippacking sets for hydraulic and pneumatic use
Methods for measuring stack heights
Fluid power systems and components--Multiple lippacking sets--Methods for measuring stack heightsPublished on September 20, 1988
Implemented on May 1, 1989
Published by the State Administration of Technical Supervision
National Standard of the People's Republic of China
Multiple lippacking sets for hydraulic and pneumatic use
Methods for measuring stack heights
Fluid power systems and components-Multiple lippacking sets.-Methods for measuring stack This standard is equivalent to the international standard ISO3939-1977 "Multi-layer lip seal assembly for hydraulic and pneumatic use: method".
WDC 678.4.03-47
GB 9880-83
Measuring the height of the earthquake
1 Subject content and scope of application
This standard specifies the method for measuring the laminarity of multi-layer lip seal assemblies (hereinafter referred to as "sealing components") with more than one lip seal ring.
This standard is applicable to measuring the stacking height of the sealing assembly. This sealing assembly is made of different materials (including woven materials). It has various cross-sectional shapes. For example: it is composed of V-shaped, U-shaped or W-shaped lip seal rings for hydraulic and pneumatic use with (or without) support rings. Reference Standards
GB 5719, Rubber Seal Terminology
3 General Requirements
3.1 This standard specifies three methods for measuring the stacking height of sealing components. The selection of the three methods shall be determined by the supplier and the buyer, but method 1 shall be preferred.
3.2, Method 1—Unrestricted Method
This method is recommended for measuring sealing components with an outer diameter of less than 200mm. When used to measure sealing components with an outer diameter of more than 200mm, it is necessary to divide the measurement into ten sections along the circumferential direction. 3.3 Method 2—Restricted Point Method
This method is mainly used to measure sealing components with an outer diameter of more than 200mm, and can also be used to measure sealing components with an outer diameter of less than 200mm. 3.4 Method 3—Restricted Inner and Outer Diameter Method
, which is usually used in conjunction with Method 1 or Method 2. It is necessary to pre-measure when measuring. This method can be used as a preliminary measurement. In mass production, add load.
4 Test specimen
The test specimen shall be: 3 to 5 qualified sealing rings weighed together, with a sealing assembly consisting of a pressure ring and a support ring at the upper and lower ends. 5 Measuring device
The typical measuring device of this method is shown in Figure 1
Approved by the Ministry of Chemical Industry of the People's Republic of China on May 19, 1988 and implemented on May 1, 1989
Sliding bearings
GB 9880-88
Typical measuring device
Non-balance block
Support ring
V-ring
5.2 The fixture used in method 2 is composed of two parallel guide posts mounted on a rigid base plate. The distance between the two guide pins can be adjusted. The typical device is shown in Figure 2. Figure 2 Typical device for method 1. 5.3 When using method 3, a set of accurate inner diameter plug gauges (hereinafter referred to as "plug gauges") and outer diameter ring gauges (hereinafter referred to as "ring gauges") and a follower ring are required for each size measured. The plug gauges and ring gauges should be designed to be the same size as the corresponding sealing cavity. Ventilation grooves should be opened on the plug gauges and ring gauges, and the plug gauges and ring gauges should be kept clean, dry and intact. 6 Test load 6.1: The test load (P) value in this method depends on the material and shape of the specimen. The test load value must be able to make the weight plates of the specimen fit tightly without causing deformation. B9886-88
6.2 For Method 1 and Method 3, the test load is calculated according to formula (1): P=0.s
Where: P—test load, N,
D—semi-mean diameter of the specimen (inner diameter + outer diameter2
S—radial cross-sectional area of ​​the specimen, m23
Kp—test load per unit volume, N/m2.
6.3 For Method 2, the test load is calculated according to formula (2): 13P-SK
S—radial cross-sectional area of ​​the specimen, m,
Kp—test load per unit area, N/m2.
?Measurement procedure
7.1 Method 1 -
Unrestrained limit method
7.1.1 Place the specimen at the center of the bottom plate of the test device (see Figure 1). 7.1.2 If necessary, apply a preload to secure the specimen. 7.1.3 Apply the test load (see 6.2), measure and record the specimen height. 7.2 Method 2 - Limit - Point methodwww.bzxz.net
7.2.1 Adjust the guide pins to a position where the distance between the two guide pins is equal to the radial cross-sectional width of the seal cavity. First The support ring is placed between the two guide posts and connected to the bottom plate, and then placed in the sealing cabinet, and finally the pressure ring (see Figure 3). 7.2:2
P (Network Test You Shang)
Shengnengrou
Support Ring
Typical Device of Method 2
7.2.3 Place the fixed sample on the measuring device shown in Figure 1, and apply the test load along the axial direction between the two guide posts (see 6.3). The measurement is carried out according to the instructions,
1] The units of the calculation formulas in the international standards are not specified. 3
GB 9880-88
And record the height of the sample.
Select F equal measuring points on the circumference of the sample, measure their lengths respectively, and calculate the average value. The number of measuring points shall be agreed upon by the supplier and the buyer 7.2.4
.
7.3 Method 3
Limited inner and outer diameter method
7.3.1 First put the pressure ring into the ring gauge, and then put the sealing ring and support ring. Turn over the ring gauge with the sample installed, and insert the plug gauge from the end of the pressure ring (see Figure 4). 7.3.2
Follow-up ring
Support ring
7.3.3 Put the follow-up ring.
P (test load)
Figure 4 Typical device for method 3
Place the fixed sample at the center of the measuring device shown in Figure 1, and apply preload to fix the sample: 7.8.4
7.3.5 During operation, ensure that there is no air entrained in the sample and there is no abnormal friction between the sample and the gauge. 7.3.6 "Remove the preload, add the test load (see 6.2), measure and record the sample height, 8 Test report
The test report should include the following:
The name and specification of the seal ring,
The measurement method used;
The height of the sample (seal assembly), if method 2 is used, the number of measuring points should also be reported; test load value:
The test period and the measurement and review personnel.
Additional remarks:
This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Sealing Device Branch of the National Hydraulic and Pneumatic Standardization Technical Committee. The Guangzhou Machine Tool Research Institute of the Machinery Committee and the Northwest Rubber Industrial Products Research Institute of the Ministry of Chemical Industry are responsible for drafting this standard. The main drafters of this standard are Du Mao, Li Chunmu and Chen Duyang.
National Standard of the People's Republic of China
Multi-layered shaped seal assembly for hydraulic and pneumatic
Method for measuring the stacking height
GB 980—88
Published by China Standards Press
(Beijing Fuwai Sanjiahe)
China Standards Press Beijing Printing Guangyinju 1
Xinhua Bookstore Beijing Distribution Office Distributed: Sold by Xinhua Bookstores in various places. Copyright is exclusive and no reproduction is allowed
Format 880×12301/16 Printing sheet 1/2
Number of pages 8000
First edition in July 1989
First printing in July 1989
Print count [3000
No. 15: 155066-1-8316
Price 0.50 yuan
Heading 11437
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