Special centrifugal casting machine for large-scale bearing bush babbitting

Abstract

The invention discloses a special centrifugal casting machine for large-scale bearing bush babbitting. The special centrifugal casting machine comprises a speed reducer, a main shaft, a box body, a clamping disc and a casting system, wherein the speed reducer is connected with the main shaft through a belt pulley; the main shaft is mounted in the box body through a bearing, penetrates through the box body, and is connected with the clamping disc; a clamping claw assembly is arranged on the clamping disc and used for clamping a workpiece; a casting groove in the casting system extends into the inner cavity of the workpiece. The special centrifugal casting machine has the positive effects that the temperature rise in a moving part is greatly reduced, and thus the bearing is not easy to damage; in high-temperature workpiece babbitting process, a floating clamping claw mechanism is kept being in the clamping state, so as to avoid a heat expansion/cold contraction impact on the workpiece; through equidistant key grooves in a clamping claw seat, the equipment bearing capability is improved; a steel ruler is arranged on the obverse of the clamping claw seat for reference, so that the high-temperature workpiece can be quickly clamped and correctly positioned; and hydraulic thrust clamping is replaced by mechanical claw clamping, so as to increase the workpiece fixing reliability, reduce the maintenance frequency of a hydraulic system, and improve the product quality and the production efficiency.

Description

technical field [0001] The invention relates to a special centrifugal pouring machine for large-scale bearing bush pouring, which is used for uniformly casting molten babbitt alloy liquid to the inner wall of a circular workpiece by centrifugal force. The centrifugal pouring machine drives the large workpiece to rotate at high speed, and the babbitt alloy liquid is injected into the inner cavity of the workpiece, and the alloy liquid is evenly spread on the inner wall of the workpiece under the action of centrifugal force. Background technique [0002] Centrifugal casting machines are widely used in the market, including vertical and horizontal centrifugal casting machines. For large-scale bearing bush casting, if a vertical centrifugal casting machine is used, a large line speed is required to generate centrifugal force to fill the inner cavity of the workpiece with the alloy liquid, and the thickness of the alloy is not large. Uniform (thick bottom and thin top); the horiz...

AI Technical Summary

Problems solved by technology

Existing problems: ①Frictional force drives the workpiece and the fixed wheel shaft to rotate, the bearing capacity is low, and it is prone to slipping, which affects the casting quality ②The rotating shaft is in direct contact with the high-temperature workpiece, the temperature rises rapidly and the temperature of the spindle is high, and the bearing is easy to lock and damage , reduce production efficiency ③The amplitude of the equipment is large during casting, the working pressure of the hydraulic clamping system is large, and the stability is poor, resulting in an increase in oil temperature, and the hydraulic components are vulnerable to damage in high temperature environments ④The workpiece is manually marked and positioned, with poor centering ability, large eccentricity, and high speed Rotation produces strong centrifugal force, which can easily cause the workpiece to slide radially, causing safety accidents

[0004] With the increasing power of steam turbine generator sets, especially the development of nuclear power technology, the specifications of bearing bushes are also gradually increasing. The existing centrifugal casting machines for bearing bushes can no longer meet the casting requirements of large bearing bushes, and the existing casting machines have the above problems and often need to be repaired.

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