Reciprocating screw is a kind of screw that can make the slider realize reciprocating motion without changing the direction of spindle rotation. Reciprocating screw is a form of three-dimensional cam pair, which is manifested by two threaded grooves of the same pitch and opposite rotation. The two ends are connected with excessive curves. Through the rotation of the screw, is the side of the spiral groove to promote the slider placed in the spiral groove for axial reciprocating motion.
Screw or called "screw" drive, is a spiral transmission, ball screw (has basically replaced the trapezoidal screw, commonly known as screw) is used to convert rotary motion into linear motion; or linear motion into rotary motion of the actuating element, and has a high transmission efficiency, positioning accuracy, etc.; when (ball) screw as the active body, or the linear motion into the rotary motion of the executive element, and has high transmission efficiency, positioning accuracy, etc.; when (ball) screw as the active body, or the linear motion into the rotary motion of the executive element. ) screw as the active body, the nut will be converted into linear motion with the rotation angle of the screw in accordance with the corresponding specifications of the guide, the passive workpiece can be connected through the nut seat and the nut, so as to realize the corresponding linear motion.
Hydraulic transmission is the use of hydraulic pumps to convert the mechanical energy of the prime mover into the pressure energy of the liquid, through the change of the liquid pressure energy to transfer energy, through a variety of control valves and piping, with the help of hydraulic actuating elements (hydraulic cylinders or motors) to the conversion of the liquid pressure energy into mechanical energy, so as to drive the working mechanism, to achieve linear reciprocating and rotary motion.
Screw, generally in the machine tool above the threaded:
1, in accordance with the national standard GB/T17587.3-1998 and application examples, ball screws (has basically replaced the trapezoidal screw, has been commonly known as the screw) is used to convert rotary motion into linear motion; or linear motion into rotary motion of the actuating element, and has a high transmission efficiency, positioning accuracy, etc.
2, when the screw as the active body, the nut will be with the screw's angle of rotation in accordance with the corresponding specifications of the guide into a linear motion, the passive workpiece can be connected through the nut seat and the nut, so as to realize the corresponding linear motion.
3, ball screws between the mother of the silk due to no gap, linear movement of high precision, especially in the frequent change of direction without gap compensation. The friction between the ballscrews is very small, so it is very easy to rotate.
4, ball screws and motors connected to the middle of the coupling must be added to achieve a flexible connection. Synchronous belt can be directly connected to the motor output shaft with synchronous wheel.
5, ball screws according to the national standard GB/T17587.3-1998, is divided into positioning ball screws (P) and drive ball screws (T) two categories. Accuracy level *** divided into seven levels, namely, 1.2.3.4.5.7.10 level, 1 level of accuracy is the highest, in order to reduce.
6, ball screws rotate a week of the nut to move the distance for a pitch distance, if it is the screw every turn of the nut to move four (or five) helix distance, then that the screw is four (or five) line screw, commonly known as the four (or five) screws. Generally small lead ball screws are used in a single line, medium, large or oversized lead with two or more lines.