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Valve seal (ring) material usage range comparison table
The selection of valve sealing material is determined according to the operating conditions of the valve, such as: pipeline medium, temperature range (high and low temperature), pressure and internal structure of the valve. For different occasions, the selected seals are also different. Valve seals can generally be divided into two categories: soft seals and hard […]
What is the positive transmission of gears
When the total displacement coefficient of a pair of gears is greater than 0, it is a positive transmission. Positive transmission refers to the positive displacement design of the gear. If two gears meshing with each other are in positive displacement, their center distance is greater than (the pair of gears) standard center distance. Conversely, […]
Accuracy requirements of Equipment installation
1. For static equipment The vertical deviation of vertical equipment should not be greater than L/1000 and not greater than 10mm. Unless the drawings have special requirements. The horizontal deviation of horizontal equipment should not be greater than L/1000 in the axial direction and 2D/1000 in the radial direction. 2. For moving equipment When the […]
What is assembly error and how to control it?
Assembly error refers to the difference between the installation position of the parts and the ideal position required by the assembly specifications and design regulations and processes. Causes of assembly errors: ①Part error: the additional error caused by the manufacturing error of the part and the deformation and wear after operation and use. ② Errors […]
What is machining accuracy, machining error, tolerance?
1. Machining accuracy: the degree to which the actual geometric parameters (size, shape and position) of the part after processing are in line with the ideal geometric parameters. The higher the degree of conformity, the higher the processing accuracy. 2. Machining error: the degree of deviation of the actual geometric parameters of the part from […]
What is the transmission ratio
In a mechanical transmission system, the ratio of the angular velocity or rotational speed of the driving wheel at the beginning and the driven wheel at the end. Transmission ratio (i) = ratio of driving wheel speed (n1) to driven wheel speed (n2) = inverse ratio of gear index circle diameter = ratio of driven […]
Types of mechanical transmission
There are many forms of mechanical transmission, which can be divided mainly into two categories: 1. Friction transmission that transmits power and motion by friction between parts, including belt transmission, rope transmission and friction wheel transmission. Friction transmission is easy to achieve stepless speed change, and it can mostly adapt to transmission occasions with large […]
Form and types of Gear transmission
Gear transmission types: As per the mutual position of the two wheel axes, gear transmission can be divided into plane gear transmission and space gear transmission. According to the type of gear transmission: 1. According to the relative position of the two shafts and the direction of the gear teeth, it can be divided into […]
How to Find Gear Modification Coefficient
How to calculate gear modification coefficient: 1. Total displacement coefficient: 2. Coefficient of variation of center distance: 3. Coefficient of change of addendum height: 4. The modification coefficient table of the number of teeth z=8～20 cylindrical gear:
What is the gear modification coefficient
The standard gear transmission has some limitations: (1) Limited by undercutting, the number of teeth should not be less than Zmin, making the transmission structure not compact enough; (2) Not suitable for occasions where the installation center distance a’is not equal to the standard center distance a. When a'<a, it cannot be installed, when a’>a, […]