The slewing drive is a particular rotary reduction product derived from the slewing ring product with high integration and large gear ratio, simple structure, easy use, and maintenance because the slewing ring is used as the follower and the frame basis, the inner and outer rings of the slewing ring are used to realize the input and output of the driving power respectively so that the slewing drive can not only achieve 360-degree rotation without a dead point but also can install a driving power source based on the slewing ring frame at the same time. Hence, its transmission efficiency is high; it’s a new mechanical transmission device family member. Also, because it is essentially a speed reducer, it can be called a rotary reducer, slewing ring reducer, or drive slewing ring.
The Basic Technology Introduction About Slewing Drive
The slewing drive can be divided into gear and worm gear shaft drives according to different transmission forms. The other closed state of the worm gear can be divided into open and closed 2 types. The most straightforward slewing drive is used in excavators, and tower cranes drive slewing rings on construction machinery products. As the last link of the reduction transmission chain, this slew drive is an open type of gear transmission, its front end also needs to be equipped with a planetary reducer with a large gear ratio as its power input, so it can only be called the prototype of slewing drive.
A slewing drive with integrated worm gear worm shaft transmission has been developed to expand the application range of such products and further improve the convenience of product use and maintenance. To further enhance the drive capacity of the product, the enveloping worm shaft transmission is also applied to such products. The slewing drive equipped with an envelope worm increases the driving torque and improves the driving accuracy. It can also be digitally controlled. Therefore, it is widely used in tracking and fine-tuning devices on solar and wind power generation equipment. In addition, it has sound application effects in robots, radar, low-speed heavy-duty lifting equipment, lifting equipment, and precision CNC turntables.
Slewing Drive Selection Guide
Slewing drive products can be divided into open type and closed type according to the closed condition of the transmission. According to different transmission forms, they can be divided into gear type and worm gear type. HZPT has these products, and users must make choices based on their application requirements and use environment.
Generally, the closed structure is used in humid, medium dust, or corrosive gas environment and those with high environmental protection requirements that do not allow the leakage of lubricating grease. The closed environment can effectively prevent impurities from entering the slewing drive body and improve the machine service life. However, sealing parts will accelerate wear and quickly fail when there is too much dust in the environment, and the slewing drive is entirely placed in the dust. The closed environment may not be convenient for maintenance and parts replacement. However, it is more appropriate to use an open structure slewing drive with the selection of tooth surface hardening to improve the durability of the parts. In addition, the open structure is convenient for cleaning impurities. If the use and maintenance can be done well, it may not have a shorter life than the closed structure, so all factors must be considered comprehensively in the product selection process.
To meet the diversified needs of the construction machinery field for full circle slewing drive products, HZPT has developed a slewing drive that can be adapted to construction machinery. It can be used on cranes, lifting machinery, and excavator tooling attachments. The specially designed slewing drive for construction machinery overcomes the shortcomings of low efficiency and extensive wear of the original worm gear worm shaft transmission. Combined with the heavy-duty characteristics of the envelope worm drive, the volume of various construction machinery can be further reduced, and the efficiency further improved. We recommend using a unique worm slewing drive for low-speed and heavy-load excavator tooling, lifting, and hoisting machinery.
Slewing Drive Series
The slewing drives designed and produced by HZPT are available in EWA, EGA, EGE, and other series. The slewing drive can also be equipped with hydraulic motors, AC motors, DC motors, servo motors, stepping motors, etc. The bases of the slewing drives have an open type and closed type. Generally, the open structure slewing drive is mainly used in applications where the environment is too wicked, and the maintenance and maintenance cycle is short. The open structure slew drive is more convenient for inspection, maintenance, and service of the machine parts and also more suitable for replacement. However, the closed structure can provide a longer service life when the environmental conditions have not changed much, and the environmental pollution level is below the medium level.