Rotary crank drive

 

(57) Abstract:

The drive is intended for use as a drive of valves. The actuator includes an output shaft with a crank pair connected by an axis with the output end of the rod of the piston cylinder, a return spring. The axis is made together with the guides, with the possibility of lateral movement relative to the end of the rod having an aperture in which is located a threaded element cooperating with a threaded hole in the guide axis and the possibility of adjusting the position of the output shaft. In addition, the piston actuator cylinder contains a piston mounted on the rod, which may be able to move along the rod. To do this in the hole of the piston is placed a threaded stud, the flange cooperating with the piston, and a threaded part with a threaded hole in the end of the rod and at the other end of the stud is made of flats on turnkey and installed nut with adjustable pre-compression of the spring return stroke. The surface of the piston mating with the surface of the rod has a hole, which has a locking element that interacts with the groove made on the rod. When the torque on the output shaft and the speed of operation at a certain constant pressure control environment. The drive has the ability to control the magnitude of the pre-compression spring reverse that provides the specified torque on the output shaft. The technical result is increased reliability. 1 C. p. F.-ly, 4 Il.

The invention can be used in mechanical engineering, in particular as the actuator for valves pipe fittings.

Known rotary crank drive CPLV. 303386. 023, commercially available JSC Machine-building Corporation "Alloy".

The actuator includes an output shaft with a crank pair connected by an axis with the output end of the rod of the piston cylinder, and a return spring. The angle of rotation of the output shaft is regulated by the screw stops.

Lack of drive is that one of the screw stops is located at the back of the piston cylinder. The need to seal this fence complicates the design of the actuator. In addition, when adjusting focus by changing the stroke of the piston varies the amount of precompression of the spring return stroke, and means varies the amount of torque on the output shaft created by the return spring. And this, in turn, varies the speed of operation of the actuator when invariably the particular adjustable angle while maintaining the other parameters of the actuator are the same.

Known rotary crank drive CPLV. 303386. 039, commercially available JSC Machine-building Corporation "Alloy".

The actuator includes an output shaft with a crank pair connected by an axis with the output end of the rod of the piston cylinder, a return spring, shims installed on the piston end of the rod for adjusting the magnitude of the pre-compression of the spring return stroke (the torque on the output shaft).

Lack of drive is that the adjustment is carried out stepwise, through the selection and installation of shims, that is not convenient in practice.

The closest analogue to the proposed device is an actuator according to patent EP 0383369 B1 from 03.11.93,, MKI F 16 To 31/163 containing the output shaft with the crank pair, made in the form of two arms connected by an axis with the output end of the rod of the piston cylinder. The output shaft is connected with a gate valve and is able by means of two levers to open and close the valve. The device allows rotation of the latch valve at a certain adjustable angle while maintaining the full stroke of the piston cylinder.

frame in great lever, and, accordingly, change the position of the output shaft of the actuator associated with the valve of the valve.

The main disadvantages of the actuator are

the presence of the oscillating piston cylinder, the need to install it via axis on a special bracket and the use of two levers, one of which must be bigger than the other not less than two times. In order to adjust the angle of the valve at any desired angle, it is necessary to move relative to the valve, the entire drive mechanism. All this increases the dimensions of the device and complicates the design, which limits the use of the drive in hard to reach and confined areas and significantly increases its intensity;

the presence of a large number of mobile intensive wear of the structural elements leads to an increase in backlash, which negatively affects the accuracy of the testing drive specified angle of rotation of the output link and reduces the reliability of the actuator;

supply management environment for this drive must be accessed through flexible elements, which reduces the reliability of the drive (especially at low temperatures), limits the scope of the clause is echo of application of force and, accordingly, considerably changes the torque on the output shaft, which is a significant drawback, limiting the scope of the drive.

The technical problem that was posed during the development of this invention are to provide for fine adjustment of the rotation of the output shaft of the actuator at a given angle while reducing the overall dimensions and the metal of the device, increasing its reliability and the expansion of applications by reducing the number of intensive wear of movable elements and exclusions flexible elements for supply management environment.

In addition, the extension of functionality by providing adjustment of the torque and speed of actuation of the actuator.

The result is achieved that the rotary crank drive with the output shaft with the crank pair connected by an axis with the output end of the rod of the piston cylinder, and a return spring, the axis is made together with the guides, with the possibility of lateral movement relative to the output end of the rod having an aperture in which is located a threaded element cooperating with a threaded hole NaI can travel along it at the expense of the threaded rod, which is installed in the hole of the piston and the flange cooperates with the piston, and a threaded part with a threaded hole in the end of the rod and at the other end of the stud is made of flats on turnkey and installed nut with adjustable pre-compression of the spring return stroke, with the piston, the mating surface of the rod has a hole, which has a locking element that interacts with the groove made on the stock.

In Fig. 1 shows a rotary crank drive in the cut. In Fig.2 - rotary crank drive, which shows an output shaft that is deployed on the corner . In Fig. 3 - axis, done in conjunction with the guides, with the possibility of lateral movement relative to the output end of the rod, view And Fig. 1. In Fig.4 - the control unit pre-compression of the spring return stroke, type B in Fig.1.

The actuator includes an output shaft 1 with the crank pair 2, connected by means of axis 3 with the output end of the rod 4 of the piston cylinder 5, the return spring 6, the axis 3, is executed in conjunction with the guides 7, the screw element 8 located in the threaded hole of the guides 7 and fixed with the possibility of axial to the provisions located at the opening of the piston 10, the threaded stud 11 with a flange 12, the adjusting nut 13, the fixed locking washer 14, the locking element 15 is installed in the hole of the piston 10, which interacts with the groove 16, is made on the rod 4.

The drive works as follows.

In the piston cavity, the piston cylinder 5 serves under the pressure of the operating environment. The pressure environment is perceived by the piston 10 and through the crank pair 2 is transmitted as torque to the output shaft 1, is associated with a gate valve and performing the angular displacement.

Adjustment of the angle of rotation of the output shaft 1 at a given angle is carried out by moving axis 3 relative to the output end of the rod 4 by the value of A. To do this, loosen the locking nut 9 and rotate the screw element 8, the rod which moves the guides 7, carried out jointly with the axis 3. After adjusting the position of the output shaft 1 locking nut 9 is tightened, locking movement axis 3.

The return spring 6 in the initial position is pre-compressed and passes to the output shaft 1 set the lowest torque, which ensures spotovi ameneshewa torque in the forward (under the action of the control environment) and reverse (under spring tension) direction of the stroke of the piston at a given pressure control environment. According to GOST springs in the first group exactly have controlled force, a deviation of 5%, which causes significant variation in torque from product to product. These circumstances create the need to regulate the magnitude of the pre-compression of the spring return stroke to ensure the set values (parameters) minimum torque and speed of actuation of the actuator at a given pressure control environment. The force from the spring 6 on the piston 10 should not be greater or less than a certain value, because it is in the first case reduces the speed of operation of the actuator in the forward direction (management environment), and in the second case (if the force from the spring is smaller than the norm), the response rate may also be insufficient in the opposite direction. The change of the amount of pre-compression of the spring allows you to adjust the speed of operation of the drive.

Adjusting the pre-compression of the spring 6 is an alternate rotation of the stud 11 and the nut 13. Thereafter, the nut 13 is tightened to lock the piston 10 in the flange 12) and using the washer 14. The adjustment range is limited to the long groove 16, in which Ispolzuetsa bracket and the axle to install the piston cylinder. The size of the leverage of the crank mechanism comparable in value, which reduces the overall dimensions and the intensity of the drive. And it has no connection with the increased wear and tear, leading to the formation of a backlash, such as the axis for fixing the cylinder, the groove in the large lever that moves the axis of the small lever, and flexible elements for the supply of the control environment, which increases the reliability of the drive. In addition, we are expanding the functionality by providing adjustment of the torque and speed of actuation of the actuator.

This actuator design was tested at JSC Spectrometer" Century Novgorod. Tests confirmed the operability of the claimed design of the actuator, reliability and convenience of carrying out adjustment of the torque and speed of response, which is achieved by changing the values of pre-compression springs-reverse, and not due to a change in pressure of the control environment.

Thus, the design of the drive allows rotation of the output shaft at a certain angle adjustable while maintaining the other parameters constant drive that expands the scope of iota drive.

1. Rotary crank drive with the output shaft with the crank pair connected by an axis with the output end of the rod of the piston cylinder, and a return spring, wherein the axis is made together with the guides, with the possibility of lateral movement relative to the output end of the rod having a hole in which is a screw element with the ability to adjust the position of the output shaft when interacting with the screw hole of the guide axis.

2. Drive under item 1, characterized in that the piston is installed on the rod can move along it at the expense of the threaded rod, which is installed in the hole of the piston and the flange cooperates with the piston, and a threaded part communicates with the screw hole in the end of the rod and at the other end of the stud is made of flats on turnkey and installed nut with adjustable pre-compression of the spring return stroke, with the piston, the mating surface of the rod has a hole, which has a locking element that interacts with the groove made on the rod.

 

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