Pushing gear and rack

A technology of gears and racks, which is applied in the direction of belts/chains/gears, components with teeth, hoisting devices, etc., can solve the problems of low meshing precision of casting teeth, low working efficiency of electric shovels, long replacement period, etc., to achieve The effect of improving strength and service life, improving performance strength, and prolonging the life of consumable parts

Inactive Publication Date: 2010-12-22
FUSHUN MINING IND GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This structure determines that the tooth shape cannot be processed by a tooth shape processing machine tool, and must be cast.
Casting teeth have low meshing precision, high noise, low strength and short life
Replacement is frequent, and nearly 40 tons of lifting arms and sticks need to be disassembled during replacement. The replacement period is long, the labor intensity is high, and the working efficiency of the electric shovel is low.

Method used

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  • Pushing gear and rack
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] 1. Implementation of the pair of gears

[0014] The part of the gear (1) and the steel sleeves (2) at both ends of the gear are designed separately, the casting molding is changed into a forging blank, and the gear blank and the steel sleeve blank are respectively forged. Rough machining of gear blanks → quenching and tempering → turning → milling teeth → processing splines. Quenching and tempering of the steel sleeve blank → turning, after processing the gear is installed and welded → trimming the shape and surface quenching to meet the requirements of the drawing.

[0015] 2. Implementation of the rack

[0016] The rack formed by integral casting is divided into two parts: a rack body (1) and a stopper (2). The rack body is forged with 35CrMo. After quenching and tempering, continue to process to the drawing requirements. The stop block is cut and processed from the steel plate of the same material, welded and shaped with the rack body, and after straightening, th...

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PUM

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Abstract

The invention discloses a novel gear and rack transmission system for a dipper crowding gear of a face shovel type electric excavator. The gear consists of a gear body and a steel sleeve; and the rack consists of a rack body and a stop block. After forged pieces are subjected to finishing, the gear and the steel sleeve are welded into a whole, and the rack and the stop block are welded into a whole. Compared with the conventional casting process, the material density is improved, accurate machining of gear form is realized and engagement accuracy is improved. The pushing gear and rack have the advantages of stabilizing the running of the dipper crowding gear and prolonging the life of the gear and the rack.

Description

1. Technical field [0001] The invention belongs to the field of mechanical manufacturing, and specifically solves the manufacturing problems that the structure of mechanical parts is complex, the precision and strength of casting cannot be guaranteed, and mechanical processing cannot be performed. 2. Technical background [0002] Current 4m 3 The last stage of the pushing mechanism of the front shovel electric excavator adopts a rack and pinion kinematic pair, and the axis of the gear is fixed. The rack is rigidly connected with the bucket arm, and is driven by the gear for linear and limited rotary motion. In order to restrict the movement of the rack within the design range, the gear and the rack must have corresponding structural forms. This structure determines that the tooth shape cannot be processed by a tooth shape processing machine tool, and must be cast. Casting teeth have low meshing precision, high noise, low strength and short life. The replacement is freque...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F9/02F16H55/17F16H55/26
Inventor 闫福荣宁芳武
Owner FUSHUN MINING IND GROUP
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