SU913340A1 - Device for regulating linear speed - Google Patents

Description

The invention relates to automatic regulation systems • and can be used in various branches of mechanical engineering, in particular in machine-tool construction when processing products with a cutting tool, as well as in ⁵ nuclear engineering and boiler building, for example, in the process of automatic non-destructive quality control of products by defect seekers.

A device for regulating the linear velocity, containing an electric motor, a gearbox, a lead screw and a nut fixed on the table [1], is known.

The disadvantage of this device is that the expansion of the speed range leads to a significant increase in overall dimensions and weight of the engine. In addition, in this mechanism, in order to position or change the direction of movement of the actuator, the engine must be stopped or

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reversing, which reduces its speed.

The closest in technical essence to the present invention is a device for controlling linear speed, comprising a first shaper of control signals connected in series, a first motor and a displacement mechanism made in the form of a screw-nut travel pair, a second shaper of control signals connected to a second motor mounted in guides with the ability to move and connected to the executive body. The device with simultaneous operation of the engine provides adjustment of the linear speed of movement of the executive body in a wide range from (4 V, * ν ₂ ) to (+ Y, +, where

V, - the speed of movement of the nut on

spindle axis of the first mechanism

movement; - move3 speed

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four

nut on the axis of the spindle of the second mechanism of displacement [2].

A disadvantage of the known device is that the minimum speed of movement of the executive body _{5 is} not ensured with one-side extreme position of the nuts on the axles of the spindle screws, since it is possible only with simultaneous movement of both nuts in a different direction, and the maximum speed is not ensured with the multi-sided extreme position of the nuts, because it is possible only with simultaneous movement of both nuts in one direction, which limits the range of adjustment of the linear velocity. At the same time, the positioning of the actuator without switching off the engines depends on the speed of movement V,, At ₂ nuts and 20 is limited in size and 5 ^ spindle screws

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since the positioning of the actuator without turning off the engine is possible only with simultaneous movement of the nuts in different directions with equal speed. In addition, the serial connection of two linear displacement mechanisms summarizes the shortcomings of each in terms of speed.

The purpose of the invention is to increase the speed of the device.

This goal is achieved by the fact that in the device the nut of the moving mechanism is connected through a gear transmission to the output shaft of the second engine and is rigidly connected to the body of the second engine.

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thirty

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Pa drawing shows the kinematic diagram of the device for regulating the linear. speed.

The apparatus comprises a first dviga- Tel 1 ⁴⁵ coupled to the first control signal generator 2 of its linear speed (running) screw 3 connected to the output shaft of the motor, a nut 4 connected kinetics cally ⁵⁰ through the transmission 5, such as a gear, with the output second motor shaft 6, rotatably mounted in the sleeve 7, which is mechanically connected to the housing ⁵⁵ of the second motor 6 placed in the guides 8 and connected to a second control signal generator 9, the second engine rotation speed with the actuating body 10 connected to the output member (not shown) from block 11 the automatic control system, which is electrically connected with the formers 2 and 9 inputs.

The device works as follows.

When turning on the first engine 1 rotates the spindle 3, about the second engine 6 rotates the nut 4. Through the screw 3, nut 4 and sleeve 7, the rotational movement of the output shafts of the engines is converted into translational motion of the engine body 6 and the executive body 10 with the output element along the guides 8. Wherein, . the direction and speed of movement of the actuator 10 depends on the direction and value of the speeds of rotation of the screw 3 and nut 4 and, regardless of the position of the nut on the lead screw, can take any value in the range from

[(± ω _Β ) - (+ ω _Γ ) 3 · ₅ to [(± ss) ₆ ) - (+ k1 _g ) .1z,

where - the speed of rotation of the screw 3, SC _g - the speed of rotation of the nut 4,

Z-3 = '(G1 _& · ΐββ - lead screw pitch.

With a unidirectional rotation of the screw and nut, the direction of movement of the executing organ depends on the correspondence of the rotational speeds, and the linear velocity is proportional to the difference of their values. This mode is used for emergency and work movements. When = (χ1 _{Γ, the} speed of movement of the actuator is zero. This mode is used for positioning the actuator. With a regular change in the speed of rotation, for example, of a nut relative to the screw, the actuator performs a reciprocating motion (scanning mode) in a given zone with a speed

' ^y ck = (ώ _Β - + Δω _Γ ) ΐ5

The width of the scan area is determined by the amplitude of the movement of the speed of rotation of the nut relative to the speed of rotation of the screw. Thus, the control of the actions of the executive body (movement at a given speed, scanning and positioning in a given zone) is provided by controlling the values of the rotational speeds of engines 1 and 6, and the time

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Transients depends on the rate of change in the values of these velocities, й is hundredths of a second. The values of the speeds in the required ratios are entered into the generator 5 and 9 of the rotation speed signals through the block 11 of the automatic control system according to the signals of the output element of the actuator 10 and in accordance with the specified program ¹⁰ .

This embodiment of the device provides a wide range of regulation of the linear speed of the executive body, regardless of the position of the last 5, and the device’s speed is achieved by reducing the time of transients, since the positioning mode and the direction changes are carried out 20 without turning off the electric motors.

Claims (1)

Claim A device for adjusting the linear velocity, containing the first in series ²⁵ a rotor of control signals, a first motor and a displacement mechanism, made in the form of a screw-, nut nut pair; a second driver of control signals connected to a second motor mounted in guides with a possibility of displacement and connected to an executive body, characterized in that, in order to increase the speed of the device, the nut movement mechanism is connected through a gear with the output shaft of the second engine and rigidly connected to the housing of the second engine.