Four-shaft spacing-variable bolt tightening device

Abstract

The invention discloses a four-shaft spacing-variable bolt tightening device which comprises a vertical framework, four tightening shafts and fixed blocks, wherein the four tightening shafts are divided into two groups; the two tightening shafts are contained in each group; the two fixed blocks in the same group are connected with each other in series through a guide rod; the guide rods in the two groups are arranged in parallel; a first adjusting mechanism is arranged between the two fixed blocks in the same group of tightening shafts and used for adjusting a spacing between the tightening shafts in the same group; second adjusting mechanisms are arranged at the two ends of each guide rod, and are fixed on the vertical framework and used for adjusting the spacing between the two groups of the tightening shafts; and the adjusting direction of each first adjusting mechanism is vertical to that of each second adjusting mechanism. The four-shaft spacing-variable bolt tightening device has the benefits that the longitudinal and transverse distance adjustment of the four tightening shafts can be realized through the first adjusting mechanisms and the second adjusting mechanisms, the technical problems of large operating force, slow speed and uneasiness in operation in the multi-variety production and spacing adjusting processes are solved, and the tightening quality and the reliability are improved.

Description

technical field [0001] The invention relates to the field of automatic tightening of bolts (nuts) in the automobile manufacturing industry, in particular to a four-axis spacing variable bolt tightening device. Background technique [0002] At present, the connection between the leaf spring and the axle on the heavy truck assembly line is realized by tightening 2 U-shaped bolts and 4 nuts. In actual production, a four-axis tightening device is used to complete the tightening of 4 nuts. Complete the connection between the leaf spring and the axle. The axial spacing of the four-axis tightening equipment can be changed within a certain range to meet the production requirements of various varieties, and once the tightening axis is adjusted to a position, the axial spacing cannot be changed or tilted during the tightening process to ensure tightening accuracy and prevent tightening sleeves The cylinder comes out of the nut, which requires the displacement adjustment mechanism to ...

AI Technical Summary

Problems solved by technology

[0004] The existing four-axis tightening equipment used in this station is either fixed and immutable in the position of the tightening axis, which cannot meet the production requirements of multiple varieties, and can only target one product; or uses a slide plate type displacement adjustment mechanism

The plate structure of the slide plate type displacement adjustment mechanism has poor rigidity, and at the same time, the sliding fit gap is large and easy to wear. During the tightening process, the position accuracy of the four tightening shafts cannot be well maintained, which affects the tightening accuracy. Large inclination makes the sleeve come out of the nut and cannot work normally and affects the life of the equipment

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