This standard specifies the method for dynamically determining the pitch line position of V-belt and multi-V belt drives. GB/T 15828-1995 V-belt and multi-V belt drives - Dynamic determination of the pitch line position GB/T15828-1995 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
V-belt and multi-V belt drive
Dynamic determination of pitch zone location
V-and ribbed belt-Dynamic test to determine pitch zone location
GB/T 15828-1995
This standard is equivalent to ISO8370-1987 "V-belt and multi-V belt drive-Dynamic determination of pitch zone location".
1 Subject content and scope of application
This standard specifies the method for dynamically determining the pitch zone location of V-belt drives and multi-V belt drives. 2 Reference standards
GB6931.2 V-belt drive terminology
3 Terminology
This standard adopts the terminology of GB6931.2.
4 Determination procedure
Determine the pitch diameter of the pulley installed on the test device according to the following procedure:Measure the rotation speed of the pulley n
Measure the speed of the straight part of the belt or the center distance α between the two pulleys and the time required for the belt to rotate once; c.
Calculate the pitch diameter d.
5 Test device
The test device mainly consists of the following parts:a.
Two pulleys of the same diameter. For the measuring pulleys of a specific belt, their dimensions should comply with the provisions of the corresponding standards. To meet the needs of specific belt lengths, the distance between the pulley axes should be adjustable. Device for applying the measuring force (transmission preload), and the measuring force should comply with the provisions of the corresponding standards. b.
Locking device to fix the center distance.
Mechanical device that drives one of the pulleys to run at a certain speed. This speed should not be the limit speed, but should ensure smooth operation. d.
The recommended speed is about 1000r/min.
A device for measuring the pulley speed and the belt speed or the center distance between the pulleys and the belt running time. e.
6 Measurement method
Install the belt on the test device specified in Chapter 3 and apply the measuring force specified in the relevant standard. Start the device and run it for 5 minutes so that the belt and pulley are perfectly wedged.
After normal operation, lock the movable shaft to ensure a constant center distance. Accurately measure the pulley speed and at the same time accurately measure the speed of the straight span part of the belt or the center distance between the two pulleys and the time required for the belt to rotate one circle. Record the measured values.
7 Calculation methodWww.bzxZ.net
7.1 Pitch diameter
The pitch diameter of the pulley can be calculated according to one of the following two formulas. d.
Where: d
-Pulley pitch diameter, mm;
Belt speed, m/s;
n-Pulley speed, r/min.
Where: d, Pulley pitch diameter, mm;
Center distance, mm;
n-Pulley speed, /mint
t—Time required for belt rotation, s.
7.2 Effective line difference (Figure 1)
nt --- 60
Figure 1 Effective line difference
The effective line difference is calculated by the following formula:
Where: Ae---Effective line difference, mm;
d. -—Pulley effective diameter, mm;
dp---Pulley pitch diameter, mm.
（1）
In most cases, the pitch diameter of the belt pulley in operation (determined by the pitch line position of the belt) is smaller than its effective diameter, and the effective line difference is a positive number; when it is larger than its effective diameter, the effective line difference is a negative number (such as multi-V belt drive). 7.3 Reference line difference (Figure 2)
The reference line difference is calculated as follows:
=reference line difference, mm;
Where: △d—
do-reference diameter of the pulley, mm;
d=pitch diameter of the pulley, mm.
GB/T15828-1995
Figure 2 Reference line difference
（4）
If the pitch diameter of the belt pulley in operation (determined by the pitch line position of the belt) is smaller than its reference diameter, the reference line difference is a positive number; if it is larger than its reference diameter, the reference line difference is a negative number.
Additional Notes:
This standard was proposed by the Ministry of Machinery Industry of the People's Republic of China. This standard is under the jurisdiction of the Machinery Standardization Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Machinery Standardization Research Institute of the Ministry of Machinery Industry, and Changchun Institute of Optics and Fine Mechanics and Liaoyang Machine Belt Factory participated in the drafting. The main drafters of this standard are Qin Shuan, Li Zhanguo, Liu Fengjian and Han Zhaogeng. 327
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