Economical milling machine bevel gear differential speed reducer

Abstract

The invention relates to a speed reducer, in particular to an economical milling machine bevel gear differential speed reducer which comprises a first shell component, a second shell component, a planet support component, a first motor component and a second motor component. When the speed reducer operates, the rotating speed of the second motor is maintained to be equal to the reference rotating speed, the output rotating speed of the speed reducer is changed by changing the rotating speed of the first motor, and the output power of an output shaft of the speed reducer during low-rotating-speed operation is larger than that during high-rotating-speed operation. According to the technical characteristic that the torque required by a milling machine is large when a large-diameter cutter or a part with high machining hardness is adopted, the speed reducer can achieve the purpose that the rotating direction of the output shaft of the speed reducer is changed on the premise that the first motor and the second motor are not shut down, if the motor I and the motor II adopt closed-loop control, the speed reducer can meet the technical requirements that the Z shaft of the milling machine needs to change the rotating direction in a short time and is accurately controlled during tapping.

Description

technical field [0001] The present invention is an economical bevel gear differential reducer for milling machines, which relates to a reducer, in particular to a reducer that does not include double bevel gears, the planetary carrier is located on the radially outer side of bevel gear 1 and bevel gear 2, and is located on the casing part The economical milling machine bevel gear differential reducer with simple structure and large rated output torque is driven by belts at both ends of the axial direction. Background technique [0002] The double bevel gear differential speed reduction mechanism of application publication number CN109854681A is a double bevel gear differential speed reduction mechanism that adopts two motors to respectively drive the speed difference between the first double bevel gear and the second double bevel gear to obtain a low speed output. Application publication number CN109736047A relates to a method for controlling a double bevel gear differential...

AI Technical Summary

Problems solved by technology

The DC motor works in the constant torque mode below the rated power. The input voltage of the DC motor is proportional to the output speed and output power. When the DC voltage regulator module adjusts the input voltage of the DC motor, the output speed and output power of the DC motor decrease. If the output speed of the economical milling machine is 50r / min in the low gear of the gear transmission mechanism, the output speed of the DC motor is 200r / min, and the output power of the DC motor is only 22W. The output power is only 4.4% of the rated power, which cannot meet the cutting torque required when the economical milling machine uses a large-diameter tool or processes parts with high hardness, thus limiting the application range of the economical milling machine

[0005] The axial movement of the X-axis, Y-axis and Z-axis of the economical CNC milling machine adopts the servo motor to drive the ball screw, and the rotation of the Z-axis adopts the stepless speed change system to drive the motor, including the frequency conversion stepless speed change system to drive the asynchronous motor or synchronous motor. And the DC voltage regulation module drives the DC motor, and the technical solution of the DC voltage regulation module driving the DC motor has the lowest cost. No matter which solution is used, the motor will work in the constant torque mode when the motor is running below the rated speed. Economical CNC milling machine There is no multi-stage auxiliary mechanical transmission mechanism with more than three gears, and it still has the disadvantages of low output power and low output torque when running at low speed

It is a trend that the Z-axis rotation of the economical CNC milling machine adopts the motorized spindle. The motorized spindle is characterized by high speed and low torque output. The tool diameter of the motorized spindle is small. Poor, affecting the machining accuracy, the large diameter tool requires a large torque, the electric spindle cannot meet the technical requirements

[0006] In addition, the general CNC milling machine needs the Z axis to change the rotation direction in a short time when tapping. The existing technology uses a high-power servo motor to change the rotation direction and drive the Z-axis to rotate in a short time. The high-power servo motor is expensive and uneconomical. According to the design principle of CNC milling machine, the existing frequency conversion continuously variable speed system drives asynchronous motor or synchronous motor and the DC voltage regulation module drives the DC motor technical scheme, which cannot change the direction of rotation in a short time and precisely control it.

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