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The main components of the power head

Source: Time:2020-10-20 17:39:38 浏览次数:

The main components of the power head: (1) main motion, (2) feed motion, (3) control system, (4) mechanical structure characteristics

动力头的主要组成部分:

(1)

主运动

电、气动自动进给钻削动力头的主运动采用三相异步电机驱动,经同步齿形带及花键轴将电机的转矩

传递给主轴,不同的主轴转速可由更换不同的同步齿形带轮来实现。由于动力头的主运动采用电机驱动,

主轴的转速特性好,输出功率和转矩大,能适应于多轴钻削和较大孔径的加工工况。

(2)

进给运动

由于气压传动具有动作反应快、环境的适应性好、结构简单、体积小等优点,并能实现无级调速,工

作寿命长,

动力源来源方便,

因此,

动力头的进给运动采用压缩空气作为动力源。

考虑到空气的可压缩性,

载荷变化时动力头的运动的平稳性较差,工进速度的调整和控制采用液压调速器来实现,动力头的快进和

快退速度分别用排气节流阀来调整。

(3)

控制系统

电、气动自动进给钻削动力头的进给运动采用了压缩空气为动力源,其进给运动的控制也采用了气动

控制系统,

由一个二位五通气控阀、

一个机动阀、

二个手动阀,

若干个节流阀和两个外部控制气源口组成,

结构紧凑,具有手动和远距离控制操作功能及原位、前位信号和复位信号保护功能。动力头快进行程和工

进行程可通过挡铁连续可调。

The main components of the power head:

(1) Main movement

The main movement of the electric and pneumatic automatic feed drilling power head is driven by a three-phase asynchronous motor, and the torque of the motor is transmitted to the spindle through the synchronous toothed belt and spline shaft. Different spindle speeds can be replaced by different synchronous toothed belts. Round to achieve. Since the main movement of the power head is driven by a motor, the spindle has good speed characteristics, and the output power and torque are large, which can be adapted to multi-axis drilling and processing conditions with larger apertures.



(2) Feed movement

Since pneumatic transmission has the advantages of fast action response, good environmental adaptability, simple structure, small size, etc., and can realize stepless speed regulation, long working life, and convenient power source source, the feed movement of the power head adopts compressed air As a power source. Taking into account the compressibility of air, the smoothness of the power head movement when the load changes is poor. The adjustment and control of the work advance speed are realized by a hydraulic governor, and the fast forward and fast rewind speeds of the power head are respectively exhausted. Flow valve to adjust.



(3) Control system

The feed motion of the electric and pneumatic automatic feed drilling power head adopts compressed air as the power source, and the control of the feed motion also adopts a pneumatic control system. It consists of a two-position five-way air control valve, a motorized valve, and two The manual valve is composed of several throttle valves and two external control air source ports. It has a compact structure and has the functions of manual and remote control operation and the protection functions of in-situ and previous signals and reset signals. The fast progress and work progress of the power head can be continuously adjusted through the stopper.



(4) Mechanical structure characteristics

The electric and pneumatic automatic feed drilling power head is a drilling power head that integrates the main motion, feed motion and control device of the power head. In order to achieve a compact shape, the power head adopts a spindle embedded in the cylinder structure. Concentric with the piston rod, the piston rod is hollow. Imported rolling bearings are installed inside to improve the rotation accuracy of the main shaft. The main shaft is installed on the bearing and connected to the motor by a timing belt through splines. The cylinder block is fixed on the bracket. The piston rod is equipped with a hydraulic governor and stroke adjustment screws. , By adjusting the screw to collide with the limit switch, the power head spindle can be reset.


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