Belt tensioning device

Abstract

The invention discloses a belt tensioning device. The device comprises a shell and an inner sleeve, wherein the inner sleeve extends into the interior of the shell, through holes are formed in the twosides of the shell, strip-shaped holes are formed in the two sides of the inner sleeve, and the center lines of the two through holes and the center lines of the two strip-shaped holes are arranged in the same horizontal plane; and a rotating shaft penetrates through the two through holes and the two strip-shaped holes, a gear is fixed in the middle of the rotating shaft, a rack meshed with the gear is fixed on the inner side of the inner sleeve, two first bearings are installed on the rotating shaft, the two first bearings are arranged on the two outer sides of the shell correspondingly, andan adjusting hand wheel is fixed at one end of the rotating shaft. According to the device, after a lock nut is loosened, the tension degree of a belt can be adjusted by applying torsion to the adjusting hand wheel, due to fact that the friction resistance between the inner sleeve and the shell is very small, the adjustment can be carried out with no need for applying of the very large force, sothat the labor intensity is reduced, the work efficiency of belt tensioning adjustment is greatly improved, and after the lock nut is screwed tightly, looseness and deformation of an adjusting devicein the using process can be effectively prevented.

Description

technical field [0001] The invention belongs to the field of belt tension adjustment, and in particular relates to a belt tensioner. Background technique [0002] Belts are commonly used transmission tools in the machinery industry, and belts of various materials are not completely elastic. Under the action of pre-tightening force, after a period of operation, they will relax due to plastic deformation, reducing the initial tension. In order to ensure the ability of belt transmission, it is necessary to regularly check the tension state of the belt during operation. If slack is found, it must be re-tensioned, otherwise it is prone to slipping and other phenomena and cannot work normally. When the center distance between the pulleys cannot be adjusted, a tensioning pulley device is generally used. [0003] When the belt tensioning device provided by the application document with the application number 201310022915.8 is working, the screw and the nut are difficult to ensure ...

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Problems solved by technology

[0003] When the belt tensioning device provided by the application document with the application number 201310022915.8 is working, the screw and the nut are difficult to ensure that they are on the same axis, which makes it difficult to twist the screw. In addition, the guide rod and the push rod are made of metal. The friction force is extremely high when sliding relative to each other, and it is very difficult to adjust by turning the square nut with a wrench, which makes the adjustment unable to be completed in a short time, and there will be friction noise during the adjustment process, which is inconvenient to use

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