Improved shaft end assembling and fixing structure of crane roller group

Abstract

The utility model discloses an improved crane roller group shaft end assembling and fixing structure which comprises a roller shaft arranged in a roller body, an outer supporting plate and an inner supporting plate, and the inner supporting plate and the outer side face of the inner side end of the roller shaft are welded and fixed together. A shaft sleeve is sleeved on the drum shaft on the outer side of the outer supporting plate in an interference fit manner, the wall thickness of the shaft sleeve is 20-25mm, and six triangular rib plates are uniformly welded and fixed between the axial peripheral surface of the shaft sleeve and the radial plate surface of the outer supporting plate at intervals. The device is simple in structure, damage to metal materials of shaft parts caused by a welding mode can be eliminated, the on-line service life of the winding drum set is prolonged, and safe and reliable operation of the bridge crane is guaranteed.

Description

Technical Field

[0001] The utility model relates to an improved crane drum assembly shaft end assembly fixing structure. Background Art

[0002] The main hoisting mechanism of the crane is composed of a reducer, a drum group, a drive motor, a coupling, a pulley system and a wire rope. The drum group is the main load-bearing component for winding and supporting the wire rope. The drum group is mainly divided into two categories according to its processing and manufacturing methods. One category is the casting drum shaft and the support plate are assembled with transition fit. In order to prevent the drum shaft from moving, the end face of the drum support plate and the outer surface of the inner ring of the bearing are installed with a sleeve for axial positioning to achieve axial positioning and fixation; the other category is the steel plate rolled and welded drum, and the drum shaft and the support plate are directly welded and fixed. The shaft end fixing methods of the two drum groups are different, and the assembly connection form of the output shaft directly affects the safe use of the drum group. During the flaw detection inspection of the steel plate rolled and welded drum during use, cracks are often found in the welding part between the support plate and the output shaft, which directly affects the safe use of the crane.

[0003] Literature search: 1. Patent No. CN201620570565.8 announced "A crane drum device". This utility model includes: a drum shaft, a support plate, and a drum. The support plates are welded at both ends of the drum made of steel plates. The drum shaft is respectively installed on the support plates at both ends along the center line of the drum. The drum is made of thin steel plates. A reinforcing ring, transverse reinforcing ribs, and longitudinal reinforcing ribs are arranged inside the thin-walled drum. Several reinforcing rings are arranged in the inner cavity of the thin-walled drum. Several transverse reinforcing ribs are evenly distributed along the circumference between the thin-walled drum and the reinforcing rings. Several longitudinal reinforcing ribs are evenly distributed along the longitudinal direction between the thin-walled drum and the reinforcing rings. This utility model is used for cranes and has the advantages of simple structure, small deadweight, and low manufacturing cost. It does not involve the description of the positioning and fixing method of the shaft end of the steel plate welded rolled drum group in this application. 2. Patent No. CN201620329145.0 published "A crane drum device". This utility model patent relates to a crane drum device, including a drum body, two webs and a drum shaft, and also includes a hub and a gland. The two webs are provided with through holes, one end of the hub passes through the through holes, and the other end of the hub protrudes from the outside of the web. The hub and the web are fixed by welding. The drum shaft is placed in the hub to form a hole-shaft assembly connection. One end of the drum shaft extends out of the hub. The gland is sleeved on the shoulder of the drum shaft extending out of the web, and the gland is fixed to the end face of the hub by fillet welding. This utility model greatly reduces the difficulty of making and processing the drum, and the quality is easy to guarantee, the production and processing cycle is shortened, the requirements for processing equipment are reduced, and the production and manufacturing cost of the drum is effectively reduced. It does not involve the description of the positioning and fixing method of the shaft end of the steel plate welded winding drum group in this application.

[0004] Since the crane drum assembly is a key stress-bearing component in the lifting mechanism, crane manufacturers use welding fixation in the assembly and fixation design of the drum assembly support plate and the output shaft. Under the influence of long-term use, the alternating stress acting on the drum assembly after the wire rope is loaded, and the post-weld heat treatment process cannot completely eliminate the welding stress, fatigue cracks are prone to occur in the welds of the drum shaft welding parts. Summary of the invention

[0005] The purpose of the utility model is to provide an improved crane drum assembly shaft end assembly fixing structure, which can eliminate the damage to the metal material of shaft parts caused by welding, increase the online service life of the drum assembly, and ensure the safe and reliable operation of the bridge crane.

[0006] The technical solution adopted by the utility model is an improved crane drum group shaft end assembly fixing structure, including a drum shaft and an outer supporting plate and an inner supporting plate arranged in the drum body, the inner supporting plate is welded and fixed to the outer side surface of the inner end of the drum shaft; a shaft sleeve is interference fitly sleeved on the drum shaft outside the outer supporting plate, the shaft sleeve wall thickness is 20-25mm, and 6 triangular rib plates are welded and fixed evenly spaced between the axial outer peripheral surface of the shaft sleeve and the radial plate surface of the outer supporting plate.

[0007] Through the stress analysis of the reel group, without changing the original design structure of the reel support plate, the assembly and fixing structure of the design is improved to reduce the stress concentration in the original welding parts and improve the stress condition of the reel shaft, so as to extend the online service life of the reel group.

[0008] The roll shaft of the steel plate rolled welding roll of the utility model adopts a short shaft form, which is positioned and aligned by two inner and outer support plates to ensure that it is concentric with the roll shaft. When the roll group rotates, it bears a large bending moment and shear force, but does not bear torque. Therefore, it belongs to the core shaft in mechanical design. Therefore, the assembly and fixing structure form of the improved design can adopt a keyless assembly form. Through the thick-walled sleeve installed, the sleeve wall thickness is 25-30mm, and the length is determined according to the actual measurement on site. The actual size of the roll shaft diameter is measured on site to determine the processing size tolerance of the sleeve inner hole. There is no size tolerance requirement on the outer surface of the sleeve. The matching tolerance is H7 / s6 to obtain a larger bonding force for permanent or semi-permanent fixing and assembly to avoid the sleeve loosening. After the sleeve is interference-fitted in place, the outer circle of the sleeve and the outer support plate are connected and fixed by welding, and then 6 spoke ribs are set evenly distributed along the circumferential direction, and the thickness is selected to be 20-25mm. The ribs, sleeves and outer support plates are all fully welded, and there is no crack after the post-weld flaw detection. The other end of the drum shaft and the inner support plate can be fixed by welding, which can effectively fix the shaft end and avoid lateral movement of the shaft. This design has been tested on site, and the results have been verified. This assembly and fixing method of the drum group effectively avoids the shaft damage caused by the conventional design welding fixing method, and reduces the force directly acting on the shaft by the outer end face of the drum by adding a sleeve and a rib plate, reduces the stress concentration at the action point of the drum shaft and the support plate, and improves the stress state of the drum shaft. It plays a certain technical guarantee role in improving the online service life of the drum group and avoiding the safety accident of the drum shaft breakage, and has the value of promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0010] Figure 2 It is a side structural schematic diagram of the utility model. Implementation

[0011] An improved crane drum assembly shaft end assembly fixing structure, such as Figure 1 , 2 As shown, it includes a reel shaft 1, an outer supporting plate 4 and an inner supporting plate 6 arranged in a reel body 5, and the inner supporting plate 6 is welded and fixed to the outer side surface of the inner end of the reel shaft 1; a sleeve 2 is interference fit on the reel shaft outside the outer supporting plate 4, and the fitting tolerance is H7 / s6. The wall thickness of the sleeve 2 is 20-25mm, and 6 triangular rib plates 3 are welded and fixed between the axial outer peripheral surface of the sleeve 2 and the radial plate surface of the outer supporting plate 4 at even intervals.

Claims

1. An improved crane drum assembly shaft end assembly fixing structure, comprising a drum shaft and an outer support plate and an inner support plate arranged in a drum body, characterized in that: The inner supporting plate is welded and fixed to the outer side surface of the inner end of the reel shaft; a sleeve is interference fit on the reel shaft outside the outer supporting plate, the sleeve wall thickness is 20-25mm, and 6 triangular rib plates are welded and fixed evenly between the axial outer peripheral surface of the sleeve and the radial plate surface of the outer supporting plate.

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