SU1404249A1 - Drive for linear displacements - Google Patents

Abstract

The invention relates to instrument making and is intended for use in dividing machines for cutting diffraction gratings, and can also be used for precise mixing, moving parts of coordinate measuring machines and optical-mechanical devices. The purpose of the invention is to improve positioning accuracy due to the possibility of carrying out continuous carriage movement. When the supply voltage is applied to the piezoelectric clamp 6, it is extended 23 1 x / x / xx. Uhku / Xxxx / L X doesn’t fit into the guides 8. When voltage is applied to the piezoelectric actuators 4 and 5, they are linearly expanded, and the actuator 4 through the clamp 6, fixed in the guides 8 due to friction, moves the carriage 3 left. The piezoelectric latch 7 is moved to the right. When the voltage on the drive elements reaches a maximum, the voltage on the latch 6 is turned off, it is compressed and leaves the position fixed in the guide 8, and voltage is applied to the clamp 7, it is fixed in the rails 8. elements 4 and 5 are reduced, and both adjoining elements are reduced in length. As a result, both latches 6 and 7 are moved to the center, and the carriage continues to move still to the left due to the interaction of the guides 8 with the latch 7. Then the switching cycles of the latches and the drive elements are repeated. 2 Il. S 8 П //// J- / xJ /// / rffl ffj fl с (Л

Description

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The invention relates to instrument making and is intended for use in dividing machines for cutting diffraction gratings, and can also be used for accurate re-machining, moving parts of coordinate measuring machines and optical-mechanical devices.

The purpose of the invention is to improve the positioning accuracy due to the possibility of carrying out continuous carriage movement.

FIG. Is a structural diagram of a linear displacement drive; in fig. 2 - timing diagrams of control voltages applied to propellers and clips, as well as corresponding to the last 8. From this point on, voltage Ts.

8. With the supply of linearly increasing voltage, U on the drive elements 4 and 5, their linear expansion occurs and the drive element 4 through the clamp 6 fixed in the guides 8 due to friction moves the carriage 3 to the left Clamp 7 at this time drive member 5 moves to the right.

At the time t 0.5, when the voltage on the drive elements reaches a maximum, the voltage on the latch 6 is turned off, it is compressed and leaves the position fixed in the direct 8 position, and the latch 7 is applied to the voltage Uc. Latch 7 is engaged and locked in the direction of

25

thirty

gram travel s carriage.

The linear displacement drive comprises a base 1, provided with linear guides 2, a carriage 3 mounted in guides 2 seconds. the possibility of movement, the piezoelectric actuator 20 elements 4 and 5 and the latches 6 and 7, the carriage guides 8, the control unit 9 and the displacement meter 10. The internal, facing each other ends, the drive elements are rigidly fixed on the base of the drive. The longitudinal axes of the drive elements are oriented parallel to the Yunlim 2 direction, in which the carriage 3 is installed. The locking pins 6 7 are installed in the dividing sleeves 11, rigidly connected to the outer ends of the driving elements 4 and 5. In the sleeves the clamps are installed with the possibility of free but the axis of the sleeve without distortions. The locking pins are located between the carriage guides 8. In the de-energized state, between the ends of the clamps and guides 8 there is a guaranteed small gap.

The meter 10 movements can be performed according to a known scheme, for example photoelectric, acting on the principle of counting interference fringes. The control unit 40 9 is designed to form rectangular stresses alternately applied to the fixing elements and the voltage of a triangular shape applied to the propulsive elements. The frequency of pulses arriving at the latches, the frequency and amplitude of the pulses arriving at the propulsive elements can be adjusted in accordance with the set speeds. and a deviation from a predetermined position of the carriage, the actual value of which is measured by a gauge 10 displacements.

Prijud works in the following manner.

At the initial moment of time 1 0, the carriage is stationary relative to the base 1, the drive elements 4 and 5, the latches 6 and 7 are included. When applying the supply voltage of 55 or UcfH to the latch 6, it is switched on, i.e. it lengthens until it stops at 45

and Od on the drive elements 4 and 5 are linearly reduced and both of the drive elements are reduced in length. As a result, both latches 6 and 7 move to the center of the engine, and the carriage continues to move still left due to the interaction of forward 8 with latch 7. Next, the switching cycles of the latches and drive elements are repeated until you need to stop the carriage or change the direction of its translational movement during oscillatory movements and clamps with a small amplitude. The speed of movement of the carriage is regulated by the change in the amplitude values of the voltages Ud of the motors and the frequency of the changes in the voltages of the drive elements and detents. To change the direction of the carriage movement, it is sufficient at any time to keep the voltage level on the drive elements constant, then change the phase of the voltages on the latches and continue the switching process in the above order.

Claims (1)

Invention Formula A linear displacement actuator comprising a base, equipped with directional heads, a carriage mounted in travelable guides, piezoelectric drive elements and piezoelectric locks installed with the Bose possibility of interaction with the carriage, and a control unit whose outputs are electrically connected with drive elements and latches, and the input is with an output displacement meter, characterized in that, in order to improve positioning accuracy, the carriage is equipped with two guides parallel to The jointed guide bars, the drive elements are installed with the possibility of interaction with one end by means of clamps with the guide carriages, and the other end is rigidly connected with the base. 8. From now on, J, 8. With a linearly increasing voltage supply, U on the drive elements 4 and 5, they are linearly expanded and the drive element 4 through the clamp 6, fixed in the guides 8 due to friction, moves the carriage 3 to the left. The latch 7 at this time by the drive element 5 is moved to the right. At the time t 0.5, when the voltage on the drive elements reaches a maximum, the voltage on the latch 6 is turned off, it is compressed and leaves the position fixed in the direct 8 position, and the latch 7 is applied to the voltage Uc. Latch 7 is engaged and locked in direction 8. From now on, J, and Od on the drive elements 4 and 5 are linearly reduced and both of the drive elements are reduced in length. As a result, both latches 6 and 7 move to the center of the engine, and the carriage continues to move still left due to the interaction of forward 8 with latch 7. Next, the switching cycles of the latches and drive elements are repeated until you need to stop the carriage or change the direction of its translational movement with oscillatory movements and clamps with a small amplitude. The speed of movement of the carriage is regulated by the change in the amplitude values of the voltages Ud of the motors and the frequency of the changes in the voltages of the drive elements and detents. To change the direction of the carriage movement, it is sufficient at any time to keep the voltage level on the drive elements constant, then change the phase of the voltages on the latches and continue the switching process in the above order. Invention Formula A linear displacement actuator comprising a base, equipped with directional heads, a carriage mounted in travelable guides, piezoelectric actuators and piezoelectric locks installed with the Bose possibility of interaction with the carriage, and a control unit whose outputs are electrically connected to the actuators elements and latches, and the input is with an output displacement meter, characterized in that, in order to improve positioning accuracy, the carriage is provided with two guides parallel to The jointed guide bars, the drive elements are installed with the possibility of interaction with one end by means of clamps with the guide carriages, and the other end is rigidly connected with the base. Us, UyZ feffflf r -H HII FIG. 2