Search

CN-224209874-U - Special tool for assembling and disassembling mandrel of vertical centrifugal machine

CN224209874UCN 224209874 UCN224209874 UCN 224209874UCN-224209874-U

Abstract

The utility model relates to the technical field of centrifuge mandrels, in particular to a special tool for disassembling and assembling a vertical centrifuge mandrel, which comprises a main shaft, wherein the main shaft is of an integrally formed three-section stepped structure, the shaft diameters of the three sections of steps are sequentially reduced, an English thread is arranged on the outer part of the section with the largest shaft diameter, and a metric thread is arranged on the outer part of the section with the smallest shaft diameter. The utility model is provided with a three-section stepped shaft diameter and a double-system thread system, thereby ensuring the structural strength and the suitability. The linear thrust of the hydraulic jack is precisely and directionally transferred to the mandrel through the stepped shaft diameter, and meanwhile, the dead weight load of rotating parts such as a speed reducer, a rotary drum, a rotor and the like is balanced by means of a screw thread system, so that the safe unloading of the pretightening force of the screw thread pair of the mandrel is realized. The problems of poor centering, easiness in damaging threads and the like existing in the traditional disassembly and assembly process are effectively solved, and the overhaul efficiency of the centrifuge mandrel is remarkably improved.

Inventors

  • ZHANG CHANGLU
  • Wang Jianlao
  • WANG XUEFENG

Assignees

  • 恒力石化(大连)新材料科技有限公司

Dates

Publication Date
20260508
Application Date
20260403

Claims (4)

  1. 1. A special tool for disassembling and assembling a mandrel of a vertical centrifugal machine is characterized by comprising a main shaft, wherein the main shaft is of an integrally formed three-section ladder-shaped structure, the shaft diameters of three sections of steps are sequentially reduced, an English thread is arranged on the outer part of the section with the largest shaft diameter, and a metric thread is arranged on the outer part of the section with the smallest shaft diameter.
  2. 2. The special tool for assembling and disassembling the spindle of the vertical centrifugal machine according to claim 1, wherein the whole spindle is made of high-quality screw steel.
  3. 3. The special tool for disassembling and assembling a spindle of a vertical centrifugal machine according to claim 2, wherein the type of the screw-thread steel is 35CrMoA.
  4. 4. The special tool for disassembling and assembling a spindle of a vertical centrifugal machine according to claim 2 or 3, wherein the tensile strength of the screw-thread steel is more than or equal to 1080 MPa.

Description

Special tool for assembling and disassembling mandrel of vertical centrifugal machine Technical Field The utility model relates to the technical field of centrifuge mandrels, in particular to a special tool for disassembling and assembling a vertical centrifuge mandrel. Background In the running process of the vertical centrifugal machine, the bearing at the bottom of the rotor synchronously rotates along with the rotary drum, so that the dead weight (about 2 tons) of the rotating part is needed to be overcome in the traditional mandrel dismounting mode (mainly depending on manual work and general tools such as a jack, a puller and a large hammer), huge friction resistance is generated at the threaded connection part, the maintenance difficulty is greatly increased, and if violent dismounting is adopted, the damage to the internal threads at the top of the mandrel is extremely easy to cause. Therefore, the traditional mandrel disassembling mode has certain defects and shortcomings, and further has room for improvement and perfection. Disclosure of Invention Aiming at the problems, the utility model aims to provide the special tool for disassembling and assembling the mandrel of the vertical centrifugal machine, which applies reverse supporting force in the axial direction through a hydraulic system to balance the dead weight of a rotating part, so that the screw thread pretightening force is eliminated, and the safe and efficient disassembly and assembly of the mandrel are realized. The technical scheme adopted by the utility model is as follows: The utility model provides a special tool for disassembling and assembling a mandrel of a vertical centrifugal machine, which comprises a main shaft, wherein the main shaft is of an integrally formed three-section ladder-shaped structure, the shaft diameters of three sections of ladder-shaped structures are sequentially reduced, an English thread is arranged on the outer part of the section with the largest shaft diameter, and a metric thread is arranged on the outer part of the section with the smallest shaft diameter. Furthermore, the whole main shaft is made of high-quality screw steel. Further, the type of the deformed steel bar is 35CrMoA. Further, the tensile strength of the deformed steel bar is more than or equal to 1080 MPa. Compared with the prior art, the utility model has the following beneficial effects: The utility model has the characteristics of simple structure and convenient operation. The three-section stepped shaft diameter and double-system thread design is adopted in the structure, so that the convenience of operation can be remarkably improved while the matching precision of the mandrel is ensured. After the tool is used, the labor required by the disassembly and assembly operation of the mandrel can be greatly reduced, the operation time can be greatly shortened, and meanwhile, the torque requirement of disassembly can be effectively reduced, and the risk of thread engagement damage is further reduced. Drawings Fig. 1 is a schematic diagram of the overall structure of the present utility model. Wherein, the reference numerals are 1-main shaft, 2-English system screw thread and 3-metric system screw thread. Detailed Description In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. It should be noted that, in the description of the present utility model, the terms "upper", "lower", "top", "bottom", "one side", "another side", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present utility model and simplifying the description, and do not mean that the device or element must have a specific orientation, be configured and operated in a specific orientation. Referring to fig. 1, the special tool for disassembling and assembling the spindle of the vertical centrifugal machine provided by the utility model comprises a spindle 1, wherein the spindle 1 is of an integrally formed three-section ladder-shaped structure, the shaft diameters of the three sections of ladder-shaped structures are sequentially reduced, in the embodiment, the shaft diameters of the three sections of ladder-shaped structures are sequentially 47.3mm, 26mm and 24mm, and the corresponding lengths are sequentially 70mm, 180mm and 200mm. The screw thread is arranged outside a section with the shaft diameter of 47.3mm, so that the screw thread specification in the mandrel can be accurately matched, and the screw t