Some standard content:
HG/T 2819-—1996
There is no unified product standard for the domestic industry of combined narrow V-belts. In order to meet the production needs of products, this industry standard is specially formulated. In this standard, the basic cross-sectional dimensions of combined narrow V-belts are equivalent to the American engineering standard IP-22-1983 "Narrow V-belt Multi-belt Transmission Specifications", and the effective length and manufacturing tolerance, the matching difference of the same belt, and the center distance variation are equivalent to the international standard ISO8419-1994 "Effective Length of Combined Narrow V-Belts for Belt Drives". The tensile properties of combined narrow V-belts are expressed by the tensile properties of a single narrow V-belt, and the Japanese Industrial Standard JISK6368-1977 (85) "Narrow V-Belts" is used as a reference. The physical properties of the connecting layer are tested by the peeling strength test. This new test method is detailed in Appendix A. Appendix A of this standard is the appendix of the standard.
This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of Qingdao Rubber Industry Research Institute. The drafting unit of this standard is Shenyang Changqiao Rubber Belt Co., Ltd. The main drafters of this standard are Wang Cheng, Liu Min, Wu Huanan, Ding Jichun, An Zhongcheng, 33
1 Fan Shu
Chemical Industry Standard of the People's Republic of China
Narrow V-belts
HG / T 2819 — 1996
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of narrow V-belts.
This standard is applicable to narrow V-belts for high-speed and high-power mechanical transmission, and also to narrow V-belts for general power transmission.
2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard by reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised. Parties using this standard should explore the possibility of using the latest versions of the following standards: GB/T3686--83 Test method for full-section tensile properties of V-belts GB/T12730-91 Narrow V-belts
GB12732--91 Automotive V-belts
GB/T13490-92 V-belt uniformity specification and test method - Center distance variation method (idtISO9608:1988) 3 Product classification
3.1 Structural type
The combined narrow V-belt is composed of a covering cloth, a top rubber, a tensile body, a bottom rubber, a connecting layer and other components. The tensile body should be a rope core structure (see Figure 1) or a cord structure.
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1-Connecting layer; 2-Wrapping cloth; 3-Top rubber; 4-Tensile body; 5-Bottom rubber Figure 1
3.2 Specifications
3.2.1 Section specifications
The combined narrow V-belts are divided into four types according to the size of the section: 9J, 15J, 20J and 25J. Table 1 and Figure 2 give the basic cross-sectional dimensions of various types of combined narrow V-belts. Approved by the Ministry of Chemical Industry of the People's Republic of China on June 28, 1996 and implemented on January 1, 1997. 3.2.2 Length specification HG/T2819-1996 Basic cross-sectional dimensions and length specifications of combined narrow V-belts Micro-height belts Non-combined belts Combined belts The length of combined narrow V-belts is expressed as the effective length measured under the conditions specified in Article 5.1. The nominal value of the effective length is selected from the R40 priority number system (see Table 2). Table 2 Effective length of combined narrow belt
Height of single belt
1 60-0
Avoid high seat
Not more than
HG / T 2819 —1996
Continued Table 2 (end)
10 600
3.3 Specification marking
4 Technical requirements
4.1 Dimension requirements
4.1.1 Exposed height
HG/ T 2819—1996
Standard No.
Effective length (mm)
The accuracy of the cut size of the combined narrow V-belt is expressed by its exposed height in the length measuring machine groove. The exposed height shall comply with the provisions of Table 1.
4.1.2 Length limit deviation
The effective length limit deviation of the combined narrow V-belt shall comply with the provisions of Table 3. Table 3 Length limit deviation of combined narrow belt
Effective length nominal value
>800 ~ 1 000
>1 000 ~ 1 250
>1 250 - 1 600
>1 600 ~ 2 000
>2 000 ~ 2 500
>2 500 ~ 3 150
>3 150 ~ 4 000
>4 000 ~ 5 000
>5 000 ~ 6 300
>6 300 ~ 8 000
>B 000 ~ 10 000
>10 000
4. 1.3 Matching difference of combined narrow V-belts
Limit deviation
When multiple combined narrow V-belts are used for the same transmission, the maximum difference between the belt lengths (i.e. matching difference) shall comply with the provisions of Table 4. 4. 1.3. 12
Effective length nominal value
>1 345 ~ 2 690
>2 690 ~ 6 000
>6 000 ~ 11 430
>[1430
4.1.4 Center distance variation
G / T 2819 —1996
Table 4 Narrow V-belt matching difference
The center distance variation of each type of narrow V-belt shall comply with the provisions of Table 5. Table 5 Center distance variation AE
Effective length nominal value
>1000~2000
>2000 ~ 5000
4.2 Appearance quality
9J,15 J,20 J
The appearance quality of the combined narrow V-belt shall comply with the requirements of Table 6. Table 6 Appearance quality requirements of combined narrow V-belt
4.3 Performance
Defect name
Connecting layer sponge
Bright scar on the top surface of the connecting layer
Protrusion on the working surface
Broken cover
9I type is not allowed to have one, 151 and 25 types are allowed to have one needle waist honeycomb, and its area shall not exceed the connecting layer 5% of the area
Scars with a depth of less than 1mm are allowed at 3 locations for belts within 4m in length and at 5 locations for belts over 4m in length, but the total scar area shall not exceed 5% of the area of the connecting layer. No scars are allowed.
9J type is not allowed. For types 15J and 25J, the total length of damage to the outer covering cloth shall not exceed 25% of the belt length. No damage to the inner covering cloth is allowed.
The physical properties of a single V-belt in a combined narrow V-belt shall comply with the requirements of Table 7. 39
HG / T. 2819 1996
Table 7 Physical properties of single narrow V-belts
Tensile strength, kN
The bonding properties of the bonding layer shall comply with the provisions of Table 8, type
4.3.3 High and low temperature resistance of combined narrow V-belts Table 8
Reference force Elongation, %, ≤
Cable core
Pull-out strength, KN,>
The high and low humidity resistance of combined narrow V-belts shall meet the following requirements: After a high temperature test of 100C±70h, bending will not cause the V-belt to crack; after a low temperature test of -30×70h, bending will not cause the V-belt to crack, 5 Test method
5.1 Measurement of combined belt length
5. 1. 1 Length measuring machine
5. 1. 1. 1 Basic structure
Two identical pulleys of the length measuring test machine (see Figure 3) are installed on a horizontal axis, one of which is fixed and the other can slide. The test machine can apply the measuring force according to Table 10 and measure the center distance of the pulleys. PullWww.bzxZ.net
5. 1. 1. 2 Measuring pulley
Measuring force
Center distance indicating mechanism
Figure 3 Schematic diagram of the length measuring test machine
The cross-sectional dimensions of the pulley for the measuring disk shall comply with Figures 4, 5 and Table 9, 40
HG / T 2819 -
Table 9 Cross-sectional dimensions of length measuring pulleys
(minimum value)
1) This tolerance applies to the distance between the symmetry axes of two consecutive eave sections. 10.3
2) The limit deviation of the sum of all the e values of the same pulley groove should not be shorter than the value in this table. Figure 5
c Plate limit deviation\
e Cumulative value
Limit deviation
(minimum value)
5.1.2 Measurement procedure
When measuring the effective length, install the belt on the two pulleys of the length measuring machine, apply the measuring force given in Table 10 to the sliding wheel, rotate the pulley to make the belt rotate at least two turns, and let the belt fit into the wheel groove well. Measure the center distance between the two pulleys. Table 10 Measurement parameters
Effective circumference of the measuring pulley Ce, mm
Effective length Le is given by the following formula:
Leram +ami + Ce
Where: a
-maximum value of the center distance between the two pulleys, mm;
Measuring force of a single belt, N
HG/T 2819 —1996
“i—Minimum center distance between two pulleys, mm; C. Effective circumference of the pulley, mm.
5.2 Determination of center distance variation
Determination of center distance variation of various types of narrow V-belts shall be carried out in accordance with GB/T13490. 3.3 Determination of tensile properties of single belt
Determination of full-section tensile properties of single belt of combined narrow V-belts shall be carried out in accordance with GB/T3686. Reference force is shown in Table 11. Table 11
Reference force, kN
5.4 Pull-off strength test of connecting layer
Pull-off strength test of connecting layer of combined narrow V-belts shall be carried out in accordance with Appendix A. 5.5 High and low temperature resistance test
Combined narrow V The high and low temperature resistance test of the belt shall be carried out in accordance with the provisions of GB12732: the diameter of the tube used for measuring each specification of the narrow V-belt shall comply with the provisions of Table 12.
Tube cotton diameter
6 Inspection rules
6.1 The products shall be inspected and accepted by the quality inspection department of the manufacturer. 6.2 The product shall be inspected for size and appearance quality one by one. 15J
6.3 A batch of no more than 2000 narrow V-belts of the same specification manufactured continuously shall be taken as a batch. Sufficient samples shall be taken from each batch of products for various physical performance inspections, but at least once a month. 6.4 If one of the physical performance inspection items fails, double samples shall be taken from the batch of products for retesting the unqualified items. If one of the unqualified items fails, double samples shall be taken from the batch of products for retesting the unqualified items. If the result is still unqualified, the batch of products shall be deemed unqualified. 7 Marking, packaging, transportation and storage
7.1 Each combined narrow V-belt shall have obvious markings that cannot be washed off, including the following: Manufacturer name or trademark:
Specification mark:
Group code:
7.2 The packaging, transportation and storage of combined narrow V-belts shall be in accordance with GB/T 12730. 42
Appendix A (Appendix to the standard)
A1 Scope
Test method for pull-off strength of the connecting layer
This appendix specifies the test method for pull-off strength of the connecting layer of combined narrow V-belts. A2 Definition
Pull-off strength - the test specimen is stretched until the connecting layer breaks. Or the tensile force when the connecting layer and the belt are separated. A3 Test principle
On the tensile testing machine, apply increasing tensile force to the sample until the connecting layer breaks or the connecting layer and the belt are separated, and record the tensile force at this time.
A4 Test instrument
This test uses a tensile testing machine that meets the following requirements: a
The movement speed of the dynamic clamp should be 100±10mm/mi, and the movement speed should be basically constant. The clamp should ensure that the sample is well fixed so that the sample neither slips nor is clamped off during the test. The accuracy of the testing machine should ensure that the measurement error is no more than 2% of the measured force or 0.4% of the travel (whichever is larger). A5 Sample and its preparation
A 5.1 Length and quantity of specimens
A5.1.1 Cut a 400 mm long section from the narrow V-belt with a single blue strip as the specimen. The test gauge length is 100 mm and the number of specimens is three.
A5.2 Preparation
Cut off 150mm of the middle V-belt at one end of the sample together with the connecting layer above it, and cut off 150mm of the two outer V-belts at the other end of the sample together with the connecting layer above it, as shown in Figure A1, 150 mml
400mml
1150mm
Figure A1 Sample
A6 Conditioning and Test Conditions
A6.1 The sample should be cut at least 24 hours after the product is manufactured. After the sample is prepared, it should be subjected to condition conditioning for more than 16 hours under the test temperature conditions.
A 6,2 The test temperature is 23± 2℃,
7 Test procedure
A7.1 Clamp the two outer V-belts of the sample with the upper holder, and clamp the middle V-belt with the lower holder. A7.2 Pull the sample at a speed of 100±10mm/min until the connecting layer breaks or separates from the belt. Record the maximum tensile force in the test as the measured value of the pull-off strength of the connecting layer. A8 Test result expression
The test result is expressed as the arithmetic mean of the measured values of the three samples. Test report
The test report includes the following contents:
The variety, specification, production batch number and manufacturer name of the test belt; test results;
State adjustment time;
Test room temperature and relative humidity;
Test date:
Tester.1 Cut a 400mm long section from the narrow V-belt with a single blue strip as the sample, the test gauge length is 100mm, and the number of samples is three.
A5.2 Preparation
Cut off 150mm of the middle V-belt at one end of the sample together with the bonding layer above it, and cut off 150mm of the two outer V-belts at the other end of the sample together with the bonding layer above it, as shown in Figure A1, 150 mml
400mml
1150mm
Figure A1 Sample
A6 Conditioning and Test Conditions
A6.1 The sample should be cut at least 24 hours after the product is manufactured. After the sample is prepared, it should be subjected to condition conditioning for more than 16 hours under the test temperature conditions.
A 6,2 The test temperature is 23±2℃,
7 Test procedure
A7.1 Clamp the two outer V-belts of the sample with the upper holder, and clamp the middle V-belt with the lower holder. A7.2 Pull the sample at a speed of 100±10mm/min until the connecting layer breaks or separates from the belt. Record the maximum tensile force in the test as the measured value of the pull-off strength of the connecting layer. A8 Test result expression
The test result is expressed as the arithmetic mean of the measured values of the three samples. Test report
The test report includes the following contents:
The variety, specification, production batch number and manufacturer name of the test belt; test results;
State adjustment time;
Test room temperature and relative humidity;
Test date:
Tester.1 Cut a 400mm long section from the narrow V-belt with a single blue strip as the sample, the test gauge length is 100mm, and the number of samples is three.
A5.2 Preparation
Cut off 150mm of the middle V-belt at one end of the sample together with the bonding layer above it, and cut off 150mm of the two outer V-belts at the other end of the sample together with the bonding layer above it, as shown in Figure A1, 150 mml
400mml
1150mm
Figure A1 Sample
A6 Conditioning and Test Conditions
A6.1 The sample should be cut at least 24 hours after the product is manufactured. After the sample is prepared, it should be subjected to condition conditioning for more than 16 hours under the test temperature conditions.
A 6,2 The test temperature is 23±2℃,
7 Test procedure
A7.1 Clamp the two outer V-belts of the sample with the upper holder and the middle V-belt with the lower holder. A7.2 Pull the sample at a speed of 100±10mm/min until the connecting layer breaks or separates from the belt. Record the maximum tensile force in the test as the measured value of the pull-off strength of the connecting layer. A8 Test result expression
The test result is expressed as the arithmetic mean of the measured values of the three samples. Test report
The test report includes the following contents:
The variety, specification, production batch number and manufacturer name of the test belt; test results;
State adjustment time;
Test room temperature and relative humidity;
Test date:
Tester.
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