SU362170A1 - DRIVE DEVICE TO TURN ON A LIMITED ANGLE • ^,. , -, g tg '- ^ "g I h - ^ g ^ .- ^ S p l -. 1ni; 4ctHlftU-Ti.Al =; Vt;: i; hk ^' ^ BI & LIOTKL I - Google Patents

Description

one

The invention relates to drive devices for turning a limited angle of control bodies and can be used in pipeline valves for cork valves.

Devices are known for turning at a limited angle, for example, of control elements of pipeline valves, with a screw pair in the kinematic connection of a control element with a drive.

The proposed drive device differs from the known ones in that its kinematic connection is made in the form of at least one infinite flexible link covering a pair of guide elements, one of which is mounted on a shaft connected to the control member, the other on a freely rotatable one. and one of the branches of the flexible link is connected with a screw nut nut.

In addition, two infinitely flexible links can be installed in it on two pairs of guide elements, the corresponding branches of which are connected by a cross-bar, which is hinged to the nut.

Such a design of the drive unit allows an increase in the accuracy of rotation of the control member.

FIG. 1 shows the proposed drive unit, a general view; in fig. 2 is a longitudinal section of the proposed device; in fig. 3 is a section along LL in FIG. 2

The receiving device for turning at a limited angle consists of an electric motor 1 connected to a gearbox 2, in which a torque limiter clutch and a block of traveling and torque switches 3 and a handwheel 4 are located. The gearbox 2 is rigidly connected to a screw 5 on which a nut 6 is located with a roller 7 entering the housing groove located parallel to the axis of the screw 5 and two crossbars 8 connected

their ends through tensioning devices 9 with two endless flexible links — chains 10. The chains cover pairs of guide elements, one of which is chain sprockets 11, rigidly fixed on the shaft 12,

associated with the governing body, and the other guide rollers 13 are mounted on a freely rotatable shaft 14.

The drive device operates as follows.

Rotation from the electric motor 1 through the power reduction gear 2 is transmitted to the screw 5. When the screw 5 rotates, the nut 6 makes a translational movement together with the roller 7 sliding along the housing groove and protecting the nut b

from a possible turn on the screw 5 from the effect of friction forces in the thread. The nut 6 together with the cross arms 8, moving along the screw, does not have the chains 10 behind itself through the guide rollers 13. At the same time, the sprockets 1} with the output shaft 12 are turned by the required angle. The cross braces 8 are mounted on the nut 6 pivotally so that, in the course of reversing work, the tension branches of parallel branches 10 are evenly tensioned. Tension of chains 10 is performed using tension devices 9. The engine / drive unit is turned off using a torque limiting clutch. and block travel and torque switches 3.

The handwheel 4 is used to carry out work related to the setting of the drive unit and the opening-closing operation in the event of a power failure.

Subject invention

Claims (2)

1. The drive device for turning at a limited angle, for example, control pipe fittings with a screw pair in a kinematic connection of a control body with a drive, characterized in that, in order to increase the turning accuracy of the control body, the kinematic connection is made in the form of at least one infinite flexible link covering a pair of guide elements one of which is mounted on a shaft connected to the governing body, the other on a freely rotatable one, and one of the branches of the flexible link is connected to the nut of the screw pair. 2. The device according to claim 1, characterized by tejf.i, that on it on two pairs of guide elements there are two infinite flexible links, the corresponding branches of which are connected by a traverse, hinged to a nut. fff 1о о | Fig / fus- 2