阅读说明：本技术 一种龙门铣床主轴变速机构 (Main shaft speed change mechanism of planer type milling machine ) 是由 余丕亮 罗华 杨东 于 2019-11-12 设计创作，主要内容包括：本发明公开了一种龙门铣床主轴变速机构,包括滑枕和主轴,所述滑枕上装设有电机固定座,所述电机固定座上装设有电机,所述电机上装设有与电机传动连接的行星减速机,所述行星减速机的输出轴套设有主动同步轮,所述主轴上套设有从动同步轮,主动同步轮和从动同步轮之间通过同步带连接,滑枕上还装设有与主轴传动连接的编码器,编码器与电机电连接,通过电机带动行星减速机,行星减速机通过同步带传动使主轴作旋转运动,其中行星减速机内部为两挡的齿轮变速,使主轴满足低速大扭矩或高速精加工的需求,另外编码器将主轴旋转圈数的信号反馈到电机,电机对行星减速机内的齿轮间隙误差进行补偿,保证了主轴的旋转精度,以及低速刚性攻丝的需求。(The invention discloses a planer type milling machine main shaft speed change mechanism, which comprises a ram and a main shaft, wherein a motor fixing seat is arranged on the ram, a motor is arranged on the motor fixing seat, a planetary reducer in transmission connection with the motor is arranged on the motor, an output shaft of the planetary reducer is sleeved with a driving synchronous wheel, a driven synchronous wheel is sleeved on the main shaft, the driving synchronous wheel and the driven synchronous wheel are connected through a synchronous belt, an encoder in transmission connection with the main shaft is also arranged on the ram, the encoder is electrically connected with the motor, the planetary reducer is driven through the motor, the planetary reducer enables the main shaft to rotate through the transmission of the synchronous belt, two gears in the planetary reducer are changed in speed, so that the main shaft meets the requirements of low-speed large torque or high-speed finish machining, in addition, the encoder feeds back signals of the number of rotating turns of the main shaft to the motor, and the motor compensates for, the rotating precision of the main shaft and the requirement of low-speed rigid tapping are ensured.)

1. A gantry milling machine spindle speed change mechanism comprises a ram (1), a bearing seat (09) arranged on the ram (1) and a spindle (2) sleeved on the bearing seat (09), and is characterized in that a motor fixing seat (3) is arranged on the ram (1), a fixedly connected motor (4) is arranged on the motor fixing seat (3), a speed change mechanism (5) in transmission connection with the motor (4) is arranged on an output shaft of the motor (4), a driving synchronous wheel (6) in fixed connection is sleeved on the speed change mechanism (5), a driven synchronous wheel (7) in fixed connection is sleeved on the spindle (2), the driving synchronous wheel (6) and the driven synchronous wheel (7) are in transmission connection through a synchronous belt (8), an encoder (9) in transmission connection with the spindle (2) is further arranged on the ram (1), the encoder (9) is electrically connected with the motor (4).

2. A milling planer main shaft speed change mechanism according to claim 1, characterized in that the ram (1) is provided with a plurality of square holes (11).

3. A milling planer spindle speed change mechanism according to claim 1 wherein the encoder (9) is a rotary encoder.

4. A milling planer main shaft speed change mechanism according to claim 3, characterized in that the encoder (9) and the main shaft (2) are driven by a synchronous belt.

5. A milling planer main shaft speed change mechanism according to claim 4, characterized in that the shaft end of the encoder (9) is sleeved with a fixedly connected first synchronous wheel (91), the upper end of the main shaft (2) is sleeved with a fixedly connected second synchronous wheel (21), and the first synchronous wheel (91) and the second synchronous wheel (21) are in transmission connection through a second synchronous belt (22).

6. A milling planer main shaft speed change mechanism according to claim 1, wherein the ram (1) is provided with a first bearing seat (09) and a second bearing seat (091), and the main shaft (2) is respectively sleeved in the bearings of the first bearing seat (09) and the second bearing seat (091).

7. A milling planer spindle speed change mechanism according to claim 6, characterized in that the second bearing block (091) is a stepped bearing block.

8. A milling planer spindle speed change mechanism according to claim 1, characterized in that the speed change mechanism (5) is a planetary reducer.

9. A numerical control planomiller is characterized by comprising a portal frame (01), a linear module (02) arranged on the portal frame (01) and the planomiller spindle speed change mechanism as claimed in any one of claims 1 to 8, wherein the planomiller spindle speed change mechanism is arranged on the linear module (02).

Technical Field

The invention relates to a transmission mechanism of a milling machine main shaft, in particular to a speed change mechanism of a planer type milling machine main shaft.

Background

The transmission mechanism of the main shaft is one of important components of the numerical control milling machine, and the reasonable transmission mechanism of the main shaft is an important condition for ensuring the cutting capability of the machine tool.

The main shaft transmission mechanism in most existing numerical control gantry milling machines is usually connected with a motor directly or by adopting synchronous belt transmission at high rotating speed, which often results in limited rotating speed range and cutting torque range of the main shaft, if the main shaft needs low-speed high-torque tapping, a workpiece is usually transferred to another processing device to re-clamp and re-position the workpiece, which not only results in larger position tolerance of some processing characteristics of the workpiece and does not meet the high-precision processing requirement, but also can scratch the workpiece in the transfer process, therefore, the existing milling machines have the technical problem that the switching between low-speed high-torque and high-speed finish machining cannot be carried out, especially for a processing center, the single main shaft transmission mechanism using low-speed high-torque or high-speed finish machining not only has the disadvantage of higher cost, the equipment also occupies a large space.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide the spindle speed change mechanism of the planer type milling machine, which has two-gear speed change, keeps high rotating speed of a synchronous belt, and has a simple transmission structure without backlash.

In order to achieve the purpose, the invention provides a planer type milling machine spindle speed change mechanism which comprises a ram, a bearing seat arranged on the ram and a spindle sleeved on the bearing seat, wherein a motor fixing seat is arranged on the ram, a motor is arranged on the motor fixing seat, a speed change mechanism in transmission connection with the motor is arranged on an output shaft of the motor, a driving synchronous wheel in fixed connection is sleeved on the speed change mechanism, a driven synchronous wheel in fixed connection is sleeved on the spindle, the driving synchronous wheel and the driven synchronous wheel are in transmission connection through a synchronous belt, an encoder in transmission connection with the spindle is further arranged on the ram, and the encoder is electrically connected with the motor.

Preferably, the ram is provided with a plurality of square holes.

Preferably, the encoder is a rotary encoder.

Preferably, the transmission mode of the encoder and the main shaft is synchronous belt transmission.

Preferably, the shaft end of the encoder is sleeved with a first synchronous wheel which is fixedly connected, the upper end of the main shaft is sleeved with a second synchronous wheel which is fixedly connected, and the first synchronous wheel and the second synchronous wheel are connected through a second synchronous belt in a transmission mode.

Preferably, the ram is provided with a first bearing seat and a second bearing seat, and the main shaft is respectively sleeved in bearings of the first bearing seat and the second bearing seat.

Preferably, the second bearing seat is a stepped bearing seat.

Preferably, the speed change mechanism is a planetary speed reducer.

Compared with the prior art, the invention has the beneficial effects that:

the invention is provided with a ram, a bearing seat arranged on the ram and a main shaft sleeved on the bearing seat, wherein a motor fixing seat is arranged on the ram, a motor is arranged on the motor fixing seat, a planetary reducer in transmission connection with the motor is arranged on an output shaft of the motor, a driving synchronizing wheel is sleeved on an output shaft of the planetary reducer, a driven synchronizing wheel is sleeved on the main shaft, the driving synchronizing wheel and the driven synchronizing wheel are in transmission connection through a synchronous belt, the ram is also provided with an encoder in transmission connection with the main shaft, the encoder is electrically connected with the motor and drives the planetary reducer through the motor, the planetary reducer enables the main shaft to rotate through the transmission of the synchronous belt, two gears in the planetary reducer are changed in speed, so that the main shaft meets the requirements of low-speed large torque or high-speed finish machining, and the encoder can monitor the information of the number of rotation turns and the rotation speed, and the motor compensates the gear clearance error in the planetary reducer, the rotation precision of the main shaft is ensured, the main shaft does not slightly rotate reversely due to the clearance of gear transmission, and the requirement of low-speed rigid tapping is met.

The invention also provides a numerical control planer type milling machine, which comprises a portal frame, a linear module arranged on the portal frame and the planer type milling machine spindle speed change mechanism, wherein the planer type milling machine spindle speed change mechanism is arranged on the linear module.

Compared with the prior art, the numerical control planer type milling machine has the beneficial effects that: the high-speed fine machining device can meet the requirements of low-speed large torque and high-speed fine machining, meanwhile, the phenomenon of slight reverse rotation of the main shaft due to the gap of gear transmission can be avoided, and the requirement of low-speed rigid tapping is met.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a cross-sectional view of a first embodiment of the present invention;

fig. 2 is a schematic plan view of a second embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.