1, the belt drive gear assembly
Belt drive is brought into the tightly set on the two pulleys, using the friction between the conveyor belt and pulley to transmit power, two kinds of commonly used for a peaceful triangle belt transmission belt transmission, the main triangle belt transmission.
Triangle belt transmission technical requirements:
(1), the installation of pulley to correctly, usually require radial runout of (0.0025 0.0005) mm x D. For face runout (0.0005 0.0001) mm x D, D as a pulley wheel diameter of 400 mm diameter, allowable maximum radial runout 1 mm, face the biggest beating 0.2 mm.
(2), middle plane to two pulleys, general bevel or more than 1 °.
(3), surface roughness of pulley to appropriate, general del 3 – del 4, smooth surface belt easily sliding, pulley rough surface easy fever, intensifying belt wear.
(4), belt Angle should not less than 120 °, to ensure the enough power.
(5), belt tensioning force should be appropriate, too loose enough heritability, too hard, cause bearing heating and damage, even cause the belt wheel connecting shaft bend or break.
Check belt tension
In the belt transmission mechanism, by adjusting the tension device, adjusting the center distance of two axis, the belt tension is made to reach requirements, appropriate tension, according to the experience method, with their thumb press in the middle of the triangle place 15 mm can come around, keep uniform when using multiple root.
After the pulley assembly check:
The pulley assembly, after two rounds to balance. In the middle of the plane should overlap two pulleys, generally stay or ruler method is used to check. The line or straight edge on a round flower on the edge, keep straight, see if another round of tilt.
2, the gear actuator assembly
Gear transmission is commonly used in mechanical transmission way, it depends on the gear teeth and to transfer the power, its characteristic is: drive more accurate, transmission power and wide speed range, high transmission power compact structure, long service life.
Common with cylindrical gear, bevel gear, bevel gear, worm gear, etc.
Pressure Angle, number of teeth, modulus is the main reference and basis for computing a gear.
(1), pressure Angle, according to the rules, the gear tooth thickness and width equal between teeth, circle is dividing the circle on the pressure Angle of involute, known as dividing circle pressure Angle. The pressure Angle of 20 ° in China standard.
(2) and teeth: on gear throughout the circumference of a circle, the uniform distribution of tooth is called total number of teeth, when the module must have, the more number of teeth, the greater the diameter size of the gear.
(3), modulus, is one of the most basic parameters for the gear, it directly affects the gear size, the size of the tooth shape and intensity, for the same gear teeth, modulus, the greater the gear geometry size, the greater the tooth profile is, the greater the therefore bearing force.
A gear of calculation data and index between circular, circular pitch, tooth thickness, tooth width, addendum, dedendum of tip clearance, and the whole depth, addendum circle and dedendum circle base circle, coxa, center distance.
Tooth surface wear:
Gear in the rotation process, role, not only by the load on the gears and the contact of two relative sliding tooth surface produces pressure, occurs between the two tooth surface of gear in mechanical sliding friction and wear in the gear, if the wear rate is in line with predetermined design service life, should be considered normal wear and tear. Normal wear and tear of the gear tooth surface hair light, no obvious traces of friction, wear the prescribed period of time, does not affect the ability of the gearing. But tooth surface wear, will make the involute tooth surface damage, increased the backlash, instability caused by the transmission and impact, even by excessive grinding tooth thickness is thin, the load when the tooth is broken and the phenomenon of the tooth.
Tooth surface bite:
In high-speed heavy-load gear transmission, if heat dissipation is not good, make the oil temperature rise sharply, lower viscosity, can cause the oil film between tooth surfaces serious wear and tear. In addition, when the gear transmission of low speed and heavy loading, due to the working pressure is very big between tooth surfaces, lubricating film easy to squeeze broken, to make the two teeth of gear tooth surface direct contact with the metal, the tooth surface produce instantaneous high temperature, soft tooth surface of the metal will be welded in with another gear tooth surface of gear. When the gear to rotate, because of the relative sliding two gear tooth surface, the software of tooth surface formation and sliding direction of tearing the trench, this phenomenon is known as the tooth surface bite.
To prevent tooth face bite, of viscosity can be used in low speed transmission of lubricating oil, can be used for high-speed transmission of vulcanization of lubricating oil, the oil film firmly adsorbed on the tooth, and not easy to be crowded broken, still can choose different material to make two teeth to bite, and improve the tooth face hardness and surface finish, etc.
Gear transmission mechanism assembly technical requirements:
1, the gear hole and shaft assembly to appropriate, can not have eccentric and askew phenomenon.
2, ensure gears has the correct installation center and the appropriate backlash.
Slide 3, sliding gear on the shaft freely, should not be eating live and blocking phenomenon, and the axial location accurate, gear fault location shall not exceed the specified value.
4, tooth contact part of the tooth is correct, contact conform to specified requirements.
5, to the high speed of big gear, to balance checks before assembly.