CN2049298U

CN2049298U - Actuating mechanism of screw-pair link-motion drive

Info

Publication number: CN2049298U
Application number: CN 88209288
Authority: CN
Inventors: 孙达
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-08-02
Filing date: 1988-08-02
Publication date: 1989-12-13

Abstract

The utility model relates to a transmission mechanism for operating a high voltage isolating switch, mainly comprising a motor, a speed reducing gear, a screw pair, a connecting rod, a crank arm, a machine base, etc. The utility model is characterized in that the shaft of the crank arm directly or indirectly operates the opening and the closing of the knife switch of the isolating switch; when the crank arm switches to 20 DEG to 25 DEG on the front of the on switch closing position, the torque starts increasing, and the angular speed of the crank arm is gradually decreased; when the crank arm reaches the switch closing position, the torque achieves the maximum value, and the angular speed is decreased to zero; when the switch is opening, the variation of the angular speed of the torque is just opposed; the crank arm is rotates in 180 DEG or in the smaller angle range; the smaller dimension, the main knife switch and the earth contact knife switch all can be used, which creates the situation for implementing the remote control on the high voltage isolating switch.

Description

Actuating mechanism of screw-pair link-motion drive

Spiral is paid, the operation mechanism of link rod transmission, is the mechanical transmission mechanism that is used for the actuating isolating switch, belongs to the transmission part of High-Voltage Electrical Appliances control.

Operation mechanism described here mainly is that electronic mode is worked, also manually (it is different from electronic merely, also is different from simple man-operated mechanism).The present domestic operation mechanism that is used for the actuating isolating switch, most mechanical drive modes that adopt are (as CJ-2G, CJ-5, CJ-6, models such as CJ), in these in the most close prior art, mainly contain as the bottom and constitute: motor connects with worm screw in the Worm screw and worm-gear drive through one-level or double-reduction gear, slow down through deceleration Worm screw and worm-gear drive (worm screw and worm gear) again after the deceleration, drive an operation mechanism main axis rotation that connects firmly with worm gear simultaneously, two position limit switches also are installed specially (to be 0 ° at Spindle rotation angle and to locate to be provided with one, angle of rotation is 180 ° and locates to be provided with one) and in position cooperate position limit switch that one group of mechanical positioning part and block that stops worm drive is installed, the Spindle rotation angle of realizing operation mechanism is 180 °.The operation mechanism main shaft connects with the plug-in strip axle of isolating switch by connecting rod, connecting lever, and plug-in strip connects firmly at plug-in strip axle head head, and main axis rotation drives the rotation of plug-in strip axle, has realized actuating plug-in strip branch and has closed.Present actuating isolated switch main of this operation mechanism plug-in strip, the ground connection plug-in strip in the isolating switch is still used man-operated mechanism.Operation mechanism generally all is contained in the case, and this case is called mechanism case.Existing mechanism case size (because the Worm screw and worm-gear drive size is big) is all bigger,---this is existing mechanism one a big shortcoming.

Existing isolated switch main plug-in strip angle of swing is different and different with model; GW4, GW5 are 90 °～91 °; GW7 is 71 °; The ground connection plug-in strip is 85 °～90 °, and the operation mechanism Spindle rotation angle is 180 °, so generally main shaft directly can not be connected with the plug-in strip axle, must increase connecting lever at two between centers, and part such as connecting rod etc. are in addition finished plug-in strip deciliter action.The moment of torsion of above-mentioned existing operation mechanism main shaft and rotating speed all are constants, and isolating switch is only opened the moment of torsion that preceding (during separating brake) need be big in contact contact back (during combined floodgate) and contact, this be for the pressure that overcomes touch spring to frictional force that plug-in strip produced, when isolating switch closes a floodgate, also wish to reduce rotating speed, to reduce lateral bending stress to porcelain insulator.The position limit switch position is fixed in the prior art, and the mechanical positioning part and the block that are mated use are also fixed, so, outage once took place too early, make motor ... worm gear shifts to an earlier date stall, does not become feed motion and finish; It is too late that outage also once took place, and makes motor ... worm gear is rotated further, and breaks block.The operation mechanism of Japan is close with above-mentioned homemade mechanism; France MG company has that spiral is paid, the operation mechanism of shift fork structure, but main shaft can only be at 120 ° with interior rotation.

The utility model designs for the deficiency of the operation mechanism that overcomes the existing machinery transmission just.Its structure assembly relation is as follows: motor " 1 " connects with screw rod " 4 " (when manual by reduction gear " 2 ", " 3 ", handle is installed in screw head), the slider nut " 5 " that striking plate " 13 " are housed is contained on the screw rod by screw thread, simultaneously on the slider nut both sides by pivot pin Yu And row two connecting rods " a 6 " end live and connect Gai And row two connecting rod the other ends of and connect with pivot pin work with an end of two groups of connecting levers " 7 " (every group has two connecting levers), the other end of these two groups of connecting levers connects firmly on connecting lever axle " 12 ", and accompanying drawing 2 has been painted this connecting relation specially.The connecting lever axle of this scheme is exactly the main shaft of whole operation mechanism, the plug-in strip axle of main shaft and isolating switch directly (when two rotation angle ranges are consistent) or indirectly (when two rotation angle ranges are inconsistent) connect.Motor, spiral are paid, linkage mechanism (connecting rod and the connecting lever of living and connecting thereof) is installed on the support, in two walls chute " 8 " that moves for slider nut is housed up and down at support, the position limit switch " 9 " that adjustable positions, And is subjected to striking plate " 13 " control is equipped with at the chute two ends, the buffer " 10 " of stop is housed at the screw rod two ends, in addition, on screw rod, can adorn suitable length, for the sleeve pipe " 11 " that limits the slider nut range, the formation nut is paid, the operation mechanism of connecting rod transmission.

The power of this mechanism after reduction gear is reduced to desirable value with motor speed, drives the screw rod rotation from motor, slider nut moves axially along screw rod, slide in the chute of support two walls simultaneously in the slider nut two ends, the radial component ， And to screw rod play the guiding role with bearing connecting rod.The mobile promotion connecting lever of slider nut is done rotation motion, shorten support and spiro rod length or mobile right side position limit switch and change draft gear travel (realizing) by the length that changes sleeve pipe " 11 ", the scope of connecting lever rotation motion can be changed, the angle (for the needs that adapt to existing isolating switch generally are decided to be 180 °) of the maximum angle of rotation of connecting lever axle (main shaft) can be determined.Main shaft can rotate in 180 ° of scopes, also can be identical with plug-in strip axle rotation angle, and for these two direct connections create conditions, directly connection can be cut down the number of intermediate links.The design's spindle angular speed and moment of torsion change, its overall process variation relation is by qualitative the drawing of accompanying drawing 3 curves, what highlight here is, in making process, when main axis rotation during to preceding 20 °～25 ° of closing position, moment of torsion increases gradually, angular velocity reduces gradually, finish to closing a floodgate, connecting rod and screw rod are in vertical position, and connecting lever reaches the dead point, locking connecting lever axle (main shaft), at this moment moment of torsion reaches maximum value (required torque was complementary when these characteristics were moved it preferably with isolating switch, promptly helped plug-in strip and finished a deciliter action.), angular velocity reduces gradually, at last to zero (this can reduce the lateral bending stress to porcelain insulator).

The axis normal of the axis of the design's screw rod " 4 " and connecting lever axle " 12 " is non-intersect.Cross on the connecting lever axis a bit (axis of this point and screw rod is in same plane) and make the parallel lines of screw axis, these parallel lines are A to the distance order of screw axis, connecting lever " 7 " is from this parallel lines beginning, making to the angle of revolution that closing position ends is α, make the long R of being of connecting lever, then, can design A=(0.5～1.0 by changing position limit switch position, sleeve pipe " 11 " length) R, a certain determined values in the scope of α=0 °～45 °.During A, α change, main axis rotation angular velocity and consequent moment of torsion change thereupon.

After this operation mechanism is dressed up mechanism case, available end face with connects outward installation, width is less at this moment; Also available side with connects outward installation, at this moment main shaft to attachment face apart from little.Main shaft (connecting lever axle) generally is designed to vertical position (being that main shaft generally is to stand up and down), also can be designed to horizontal position.This mechanism size is less, both can be used for actuating main switch cutter, also can be used for the most ground connection plug-in strips of actuating, has created condition in the High-Voltage Electrical Appliances field isolating switch being implemented to shake control.

In addition, spiral is paid, the amount of finish of connecting rod, connecting lever, slider nut, material therefor, all require low than Worm screw and worm-gear drive, it is also low to wear and tear, below by a table, under the motor power (output) same case, compare from nine aspects with the design and prior art (is example with CJ-6), can find out advance of the present utility model, practicability.

The comparison of the utility model and CJ-6 type electric operating mechanism (motor power (output) together)

Item compared the design CJ-6 annotates

1, the mechanism case volume ratio 12

When 2, mechanism case width (mm) 310 590 end faces are installed

When 3, main shaft is to the installation of attachment face distance (mm) 90 182 sides

4, reduction gear progression 12

5, copper consumption is than 18

6, screw rod, worm screw diameter are than 1 1.4

7, connecting lever, connecting rod, slider nut and 12

The worm gear weight ratio

8, output torque change is near isolating constant

Switch motion needs.

9, the life-span is than～5 1

The design, the position limit switch position can be adjusted, and guarantees that motor in time stops operating; It is also low to produce conditions of manufacture requirement of the present utility model; In addition, still can be designed to the different a series of operation mechanisms of watt level on demand.

Claims

1, the mechanically operated operation mechanism of a kind of isolating switch, it is characterized in that motor " 1 " is by reduction gear " 2 ", " 3 " connect with screw rod " 4 " (manually the time, handle is received screw head), the slider nut " 5 " that striking plate " 13 " are housed is contained on the screw rod by screw thread, connect with the end work of two connecting rods " 6 " arranged side by side by pivot pin simultaneously on the slider nut both sides, these two connecting rod the other ends arranged side by side are lived with pivot pin with an end of two groups of connecting levers " 7 " (each group has two connecting levers) and are connected, the other end of two groups of connecting levers connects firmly on connecting lever axle " 12 ", this connecting lever axle (for this operation mechanism main shaft) can directly or indirectly connect with the plug-in strip axle of isolating switch, above-mentioned motor, spiral is paid, linkage mechanism (connecting rod and connecting lever) all is contained on the support, the chute " 8 " that moves for slider nut is housed in two walls up and down of support, an adjustable positions is equipped with at the chute two ends respectively, and the position limit switch " 9 " that controlled by striking plate " 13 ", at screw rod two ends dress buffer " 10 ", in addition, the sleeve pipe " 11 " of dress restriction slider nut range constitutes spiral and pays on screw rod, the operation mechanism of connecting rod transmission.

2, pay by the described spiral of claim 1, the operation mechanism of connecting rod transmission, the axis normal that it is characterized in that the axis of described screw rod " 4 " and connecting lever axle " 12 " is non-intersect, can be in A=(0.5～1.0) select a determined value in R, α=0 °～45 ° of scopes.

3, by the described spiral of claim 1 pay, the mechanism of connecting rod transmission, it is characterized in that the maximum angle of revolution of connecting lever " 7 " can select on demand, generally be decided to be 180 °, the angular velocity of connecting lever axle and the moment of torsion that is produced by its rotation change, during before the connecting lever axle rotates to closing position 20 °～25 °, angular velocity reduces gradually, and moment of torsion increases gradually, during to closing position, angular velocity is zero, moment of torsion reaches maximum value, and at this moment linkage mechanism and screw rod are in vertical position, and connecting lever reaches the dead point.