An impact-resistant road roller steel wheel excitation structure

Abstract

The invention discloses an impact-resistant road roller steel wheel excitation structure. A group of excitation structures comprises two fixed eccentric blocks and a movable eccentric block which arearranged on a rotatable excitation shaft in a sleeving manner; the fixed eccentric blocks are fixedly connected with the excitation shaft; the movable eccentric block can relatively rotate around theexcitation shaft; at least one of the opposite faces of the two fixed eccentric blocks is provided with a boss limiting structure capable of limiting the position of the movable eccentric block; the side face, facing the face of the movable eccentric block, of the boss limiting structure forms two limiting faces, and when the large vibration limiting face makes surface contact with one side face of the movable eccentric block, the fixed eccentric blocks and the movable eccentric block are overlapped. When the small vibration limiting face makes contact with the other side face of the movable eccentric block, the fixed eccentric block and the movable eccentric block are located on two opposite faces of the excitation shaft respectively. The limiting structure and the fixed eccentric blocksare integrally formed, a large contact area is provided for the movable eccentric block, the contact stress of the contact surface is reduced, and repeated impact of the movable eccentric block can beborne.

Description

technical field [0001] The invention relates to a steel wheel vibration working structure in the compaction steel wheel of a road roller, which is especially suitable for a double-steel wheel road roller with high vibration frequency and strict requirements on the reliability of the excitation system, and belongs to the field of engineering machinery. Background technique [0002] The core part of the steel wheel of the road roller is the excitation mechanism, which mainly includes the excitation shaft, fixed eccentric block, limit device, movable eccentric block, etc. When the road roller is working, it may need a larger excitation force or a smaller excitation force according to the different working conditions, that is, rely on the limit mechanism to realize the conversion of the two-speed amplitude. On the other hand, the road roller needs to be on the road. Back-and-forth compaction, especially for twin-drum rollers, not only has a high vibration frequency, but also req...

AI Technical Summary

Problems solved by technology

During vibration operation, the fixed eccentric mass and the movable eccentric mass rotate at a speed of 3000 revolutions per minute or even higher. When the vibration stops, the rotational speed of the fixed eccentric mass drops to zero in a very short time, while the movable eccentric mass in the middle remains The original speed continues to rotate until it hits the limit device of the fixed eccentric block, which brings a great impact to the movable eccentric block and also brings a great impact on the limit device itself and its surrounding installation structure, specifically , the existing technology is that the limit device is composed of a cylindrical limit pin and a limit pin installation hole, limited to functional requirements, the limit pin installation hole is directly processed at the edge of the fixed eccentric block, which is easy to install A weak area is formed around the pin shaft installation hole, and when the limit pin is impacted, a large impact load is brought to the vicinity of the pin hole of the fixed eccentric block, which aggravates the danger of the structure. On the other hand, the movable eccentric block and the limit pin The contact form of the pin is the contact between the plane and the cylindrical surface, the contact area is small, and the impact per unit area of ​​the contact area is large; in terms of the connection method of the limit pin, the limit pin is welded to the limit pin installation hole of the fixed eccentric block On the above, both ends of the limit pin are welds, affected by the internal stress of the weld and other welding defects, and the limit pin is frequently impacted by the movable eccentric block, the weld becomes a weak area, directly affecting the entire institutional reliability

Images