A quick-connect device suitable for heavy-duty rotary joints

Abstract

The invention relates to a quick connection device suitable for heavy-duty rotary joints, comprising: a main shaft, the main shaft comprises a conical end part and a cylindrical body part, the body part is provided with a first thread; a main shaft guide seat, The main shaft guide seat is provided with a second thread, and the second thread is matched and connected with the first thread on the main shaft body; an expansion mechanism, the expansion mechanism includes: a shaft cylinder, and the inner surface of the shaft cylinder is a cone shape, which can be matched with the end of the main shaft; the barrel wall of the shaft barrel is provided with a plurality of grooves penetrating the barrel wall, and the expansion key includes a key body and a support part arranged on both sides of the key body, The surface of the key body close to the center of the shaft barrel is tapered; the expansion key is arranged in a groove on the wall of the shaft barrel, and the support part is arranged in the middle of the groove; a bearing, the bearing It is sleeved on the outside of the shaft barrel and the expansion key; the expansion structure shell is sleeved on the outside of the bearing.

Description

technical field [0001] The invention belongs to the field of transmission devices, and in particular relates to a quick connection device suitable for heavy-duty rotary joints. Background technique [0002] In construction machinery, especially in the rotating joint part of heavy-duty construction machinery, there is often a situation where interference fit between the bearing inner ring and the shaft is required. When the rotating shaft rotates, the bearing inner ring rotates with the rotating shaft. When the operation is completed, the rotating shaft needs to be taken out, so as to realize the protection of the bearing in the non-working state. However, due to the use of interference fit, it will not only cause trouble in the process of taking out, but also easily cause damage to components such as bearings. [0003] At present, there are three main ways to solve this problem. [0004] The first is the method of using an air-expanded shaft, such as Taiwan Announcement No...

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Problems solved by technology

[0004] The first is to adopt the method of inflating the shaft, such as China Taiwan Announcement No. 290521 and U.S. Patent No. 6,196,494B1, which are mainly composed of an outer shaft sleeve, a telescopic block, and a telescopic mechanism. The inside of the slot can protrude outward or retract inward along the installation slot. The expansion of the telescopic mechanism mainly uses the expansion of the air bag to make the telescopic block protrude. The driving method of this method is pneumatic, which is often used for lighter The load cannot be applied to heavy loads. At the same time, its maintenance process is cumbersome. There are air bags and expansion sliders inside. The gravity of the external components will cause the airbag to leak, and even cause fatigue cracking, which will shorten the service life

[0005] The second is the method of using the clamping shaft, and the positioning of the inner diameter of the bearing is realized through a clamping shaft with a high concentricity, but the concentricity of the clamping shaft used in this method is difficult to adjust, and the device has no return mechanism , when withdrawing the shaft, the clamping shaft cannot retract automatically, which may easily cause damage to the bearing

[0006] The third method is to use the centrifugal expansion shaft, that is, to automatically complete the positioning and clamping of the parts through the centrifugal force generated when the centrifugal expansion shaft rotates, but this method must ensure sufficient speed to make the shaft and the bearing fit tightly. At the same time, due to the uneven mass distribution of the centrifugal expansion shaft, the centrifugal force will be inconsistent, which will cause the inner ring of the bearing to be stressed unevenly, and it is easy to produce out-of-round phenomenon after long-term use

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