Coaxiality positioning device

Abstract

The invention discloses a coaxiality positioning device which comprises a positioning shaft; screw rods are arranged at the two ends of the positioning shaft respectively, and the screw rods are movably arranged on the positioning shaft, can rotate and axially limit movement of the screw rods; each screw rod is in threaded connection with a gland, a guide piece for limiting rotation of each gland and guiding the gland to move in the axial direction of the positioning shaft is arranged between the gland and the positioning shaft, the positioning shaft is sleeved with expansion sleeves, and the expansion sleeves are connected with the glands together; and the expansion sleeves and / or the positioning shaft are / is provided with a conical surface capable of enabling the expansion sleeves to be expanded to be tightly attached to the inner wall of a hole to be positioned. Due to the fact that the glands are connected with the expansion sleeves, the expansion sleeves can be driven to move in the installation process, the positioning device can be disassembled by pulling the expansion sleeves out of the part through the glands, and disassembly and assembly are faster and more convenient.

Description

technical field [0001] The invention relates to the field of tooling, in particular to a device for coaxiality positioning. Background technique [0002] Suspended track beams are usually provided with hoisting holes at both ends, and are suspended and installed on the columns through pin shafts. The hoisting holes at both ends of the track beam have tolerance and coaxiality requirements. In the prior art, post-welding overall processing or welding through a positioning shaft is usually adopted. The track beam is a large structural part with large size and heavy weight. The overall processing needs to use large machine tools or special machine tools, and reverse clamping is extremely inconvenient, resulting in low processing efficiency and high cost. Due to the large tolerance of the single hole diameter of the lifting hole, it is usually The coaxiality requirement of the two holes is 0.5mm, and the distance between the two hoisting holes is relatively large. If the ordin...

AI Technical Summary

Problems solved by technology

The track beam is a large structural part with large size and heavy weight. The overall processing needs to use large machine tools or special machine tools, and it is very inconvenient to reverse the clamping, low processing efficiency and high cost

Due to the large tolerance of the single hole diameter of the lifting hole, it is usually The coaxiality requirement of the two holes is 0.5mm, and the distance between the two hoisting holes is relatively large. If the ordinary positioning process shaft is used, the maximum positioning diameter of the positioning shaft can only be manufactured according to the lower deviation value of the hole, and the hole has a deviation value of 0.4mm. , it is difficult to ensure the coaxiality of the two hoisting holes through shaft welding, and the welding deformation is likely to cause the process shaft to be stuck after welding, making it difficult to remove the process shaft

Patents 201420718112.6, 201420854342.5, and 202022018062.9 all disclose a tool for positioning the coaxiality of the hole. In these patents, the coaxiality positioning is realized by expanding the spring sleeve. Among them, patents 201420854342.5 and 202022018062.9 use threaded tension to realize the expansion of the spring sleeve. Open, due to the error of the thread fit itself, the coaxiality error is relatively large, and in these two technical solutions, the spring sleeve remains in the part hole after the tooling is removed, and needs to be removed separately; although the patent 201420718112.6 avoids the problem of thread fit The error problem improves the coaxiality, but the disassembly and assembly of the spring sleeve requires auxiliary tools to be removed, and for some parts with special hole types, the auxiliary tools are not practical, and the removal of the spring sleeve has become a relatively big problem

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