Yantai Bonway Manufacturer

Motor pulleys, v belt pulley, drive pulley

Pulleys are parts of disc hubs, which are generally relatively large in size. The manufacturing process is generally based on casting and forging. Generally, the larger size is designed to use the casting method, the material is generally cast iron (good casting performance), and cast steel is rarely used (the casting performance of steel is not good); generally the smaller size can be designed for forging. For steel. Pulleys are mainly used for long-distance transmission of power, such as the power output of small diesel engines, agricultural vehicles, tractors, automobiles, mining machinery, machining equipment, textile machinery, packaging machinery, lathes, forging machines, and some small horsepower motorcycles. Transmission, power transmission of agricultural machinery, air compressor, reducer, reducer, generator, gin, etc.

Selection principle:
The selection of various indicators and materials of the pulley is based on the principle of minimizing raw materials, feasible technology and lowest cost on the premise of meeting the requirements of use.

Transmission advantages:
The advantages of belt pulley transmission are: belt pulley transmission can alleviate load impact; belt pulley transmission runs smoothly, with low noise and low vibration; belt pulley transmission has a simple structure and easy adjustment; belt pulley transmission is not as strict as mesh transmission for the manufacturing and installation accuracy of belt pulleys; belt pulley transmission It has the function of overload protection; the adjustment range of the center distance of the two shafts driven by the belt pulley is large. The disadvantages of belt transmission are: pulley transmission has elastic sliding and slipping, low transmission efficiency and inability to maintain accurate transmission ratio; when pulley transmission transmits the same large circumferential force, the outline size and pressure on the shaft are larger than meshing transmission; pulley transmission belt The life span is shorter. The diameter and other dimensions of the pulleys of all kinds of mechanical equipment are configured by themselves according to the reduction ratio, and designed according to the working speed and the speed of the motor. Working speed / motor speed = driving wheel diameter / driven wheel diameter * 0.98 (slip coefficient), such as the use of steel as the material of the pulley, the required linear speed is not higher than 40m/s, such as the use of cast iron material, the required linear speed is not higher than 35m/s, motor speed and pulley diameter conversion ratio, speed ratio = output speed: input speed = load pulley pitch circle diameter: motor pulley pitch circle diameter. The pitch circle diameter is the same as the reference diameter. Diameter -2h = pitch circle diameter, h is the groove depth on the reference line. Different types of V belt h are different. YZABCDE, the groove depth on the reference line is h=1.6 2 2.75 3.5 4.8 8.1 9.6. The pulley pitch circle diameter is the theoretical diameter of the pulley pitch line position, which is a bit like the index circle diameter of a gear. It is generally represented by PD, and the outer circle is generally represented by OD. The conversion formula of different groove pitch circles and outer circles is different, generally we It is easier to measure the outer circle of the pulley, and calculate the pitch circle according to the formula. SPZ:OD==PD+4;SPA:OD=PD+5.5;SPB:OD=PD+7;SPC:OD=PD+9.6. The minimum outer diameter of the pulley of A or SPA is 80mm. If it is smaller than this size, especially at high speed, the belt is prone to delamination and cracks at the bottom. SPZ belt, the small wheel is not less than 63mm. At the same time, pay attention to the method and tension of the belt installation, too small and easy to slip, and too large to damage the belt and bearings.

Material requirements:
1. The material of the pulley used by the fan is gray cast iron HT200, HT250, etc. (but steel, copper, aluminum, etc. can also be used according to customer needs).
2. The pulley should meet the following requirements: light weight, uniform mass distribution, elimination of internal stress generated during manufacturing, and static balance correction of the pulley.

Belt specifications:
The specifications of the V-belt are divided by the back width (top width) and height (thickness). According to the different back width (top width) and height (thickness) dimensions, the national standard stipulates the O, A of the V-belt , B, C, D, E and other models, each model of the V-belt has different section widths, top widths, and heights, so the pulley must be made into various grooves according to the shape of the V-belt; The groove type determines the O-type pulley, A-type pulley, B-type pulley, C-type pulley, D-type pulley, E-type pulley and other types of pulleys.

Belt model:
V-belt models are: ordinary OABCDE 3V 5V 8V, ordinary enhanced AX BX CX DX EX 3VX 5VX 8VX, narrow V-belt SPZ SPA SPB SPC, powerful narrow V-belt XPA XPB XPC; each model of the V-belt specifies a triangle The section size of the belt, the section size of the A-type triangle belt is: the top width is 13mm, the thickness is 8mm; the section size of the B-type triangle belt is: the top width is 17MM, the thickness is 10.5MM; the section size of the C-type triangle belt is: the top The width is 22MM and the thickness is 13.5MM; the cross-sectional dimensions of the D-shaped triangle belt are: the top width is 21.5MM, and the thickness is 19MM; the cross-sectional dimensions of the E-shaped triangle belt are: the top width is 38MM, and the thickness is 25.5MM. Corresponding size (width * height): O (10*6), A (12.5*9), B (16.5*11), C (22*14), D (21.5*19), E (38*25.5).
National standards stipulate that there are seven types of V-belt models: O, A, B, C, D, E, and F. The corresponding pulley groove angles are 34°, 36°, and 38°, and each type of triangle is specified. The minimum diameter of small pulleys with corresponding groove angles of each type is not specified for large pulleys. The groove angle of the pulley is divided into 32 degrees, 34 degrees, 36 degrees, and 38 degrees. The specific selection depends on the groove type and reference diameter of the pulley; the groove angle of the pulley is related to the diameter of the pulley. The groove angle of different types of pulleys is different. The recommended pulley groove angles under the diameter range are as follows: O-type pulley is 34 degrees when the pulley diameter is 50mm～71mm; 36 degrees when the pulley diameter is 71mm～90mm, 38 degrees when >90mm; A type pulley is on the pulley When the diameter range is 71mm～100mm, it is 34 degrees, when it is 100mm～125mm, it is 36 degrees; when it is >125mm, it is 38 degrees; when the pulley diameter range is 125mm～160mm, it is 34 degrees; when it is 160mm～200mm, it is 36 degrees. , >200mm is 38 degrees; C type pulley is 34 degrees when the pulley diameter is 200mm～250mm, 36 degrees when 250mm～315mm, 38 degrees when >315mm; D type pulley is 355mm when the pulley diameter range ～450mm is 36 degrees, >450mm is 38 degrees; E type is 36 degrees from 500mm～630mm, and >630mm is 38 degrees.

installation:
1. Check the pulley groove to ensure that there are no scars or sharp edges, and all dimensions meet the standard;
2. Clean the surface of all parts, such as the hub hole, taper sleeve, bolt hole, etc. Put the cone into the pulley and align all the screw holes.
3. Apply oil to the screw (TB 1008-TB 3030) and thread (TB 3525-TB 5050) and screw into the mounting hole, but do not tighten it temporarily.
4. Clean the surface of the drive shaft, push the pulley with the tapered sleeve to the predetermined position on the shaft, and check whether the V-belt is aligned.
5. When using the keyway, you must first insert it into the hub, and there must be a certain tolerance between the keyway and the hole hub.
6. Use a hexagonal wrench that meets DIN911 standards to alternately tighten each bolt in each mounting hole gradually and evenly until the torque shown in the following table is reached.
7. After a short period of operation (0.5 to 1 hour), check the tightening torque of the bolts, and re-tighten if necessary.
8. To prevent the intrusion of foreign matter, fill the connecting hole of the hole with grease.

Disassembly:
1. Loosen all the bolts, take out one or two bolts according to the number of disassembly holes, lubricate the bolt pattern and bolt tip with oil, and insert the bolts into the disassembly hole.
2. Tighten the bolts alternately until the taper sleeve and pulley are loosened.
3. Take out the taper sleeve and pulley from the shaft.

Assembly notes:
1. Gasoline must be used for the last cleaning before assembly to ensure that all parts are clean and dry, to ensure that the mating surfaces are tightly matched and free from oil stains and have sufficient friction.
2. The hexagon socket bolts for assembly should also be washed with gasoline and dried before assembly. Lubricant or grease should not be applied to the bolts or screw holes to ensure sufficient friction and self-locking ability after the bolts are tightened.
3. When the three hexagon socket bolts are about to be installed in place, they need to be tightened in turn to ensure that the cone sleeve receives uniform axial force and the pulley and the cone sleeve are coaxially positioned well.
4. Check and measure the length of the hexagon socket bolts for assembly before installation to ensure that the assembly bolts can withstand the bottom end of the blind hole of the cone sleeve after being tightened to ensure that the cone surface fits tightly, and that the bolt receives the reverse thrust from the bottom end of the blind hole. The double nut has the same anti-loosening effect.
5. After the pulley is tightened, pull the wire to check and adjust the relative position of the main and driven pulleys to ensure that the two pulleys are on the same plane and the belt is properly tensioned.
6. The belt pulley cover should be intact and installed firmly to ensure that the belt breaks or the belt pulley looses and exits during operation, causing a major safety accident.
7. The taper sleeve is a vulnerable part. After a long time of operation, the inner hole and the chain groove may be damaged. Check each time before assembling, and replace the spare parts in time if the defect is found.

The types of pulleys are divided into flat pulleys and triangle pulleys.
The diameter of the pulley is determined according to the needs of machinery and equipment.

The working principle of the belt pulley is that a belt connects the driving wheel and the driven wheel, and the power is driven by the friction generated by the friction between the belt pulley and the belt. The belt pulley transmission runs smoothly, with low noise, low vibration, simple structure and convenient maintenance. The disadvantages are: it is difficult to install, it is prone to slipping after a long time of use, and the transmission efficiency cannot be guaranteed.

Taper sleeve pulley is a new type of pulley, which is widely used in European and American countries. It consists of two parts. Then connect a taper sleeve between the pulley and the mounting shaft, and then use an Allen key to fix the screw and lock it for use. This kind of pulley solves the problem of difficult installation of traditional pulleys. It does not need to rely on external force as before. Pullers, hammers and other items can be installed with only an Allen wrench. After installation and use, even if the pulley is worn and slipped There is no need to replace the entire belt pulley at the same time, just replace an installation cone sleeve to continue using, so that the use cost can be greatly reduced.