CN2174725Y

CN2174725Y - Position feedback device with function of electrical position limitation

Info

Publication number: CN2174725Y
Application number: CN 93244829
Authority: CN
Inventors: 王松
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-11-20
Filing date: 1993-11-20
Publication date: 1994-08-17
Anticipated expiration: 2003-11-20

Abstract

The utility model relates to a position feedback device with function of electrical position limitation used for a straight stroke power-driven actuating mechanism, comprising a bearing sleeve 3 whose upper end is provided with a gear, rotating wheel gears 5 and 6, four microswitches 7, four cam wheels 8, a conductive plastic potentiometer 9, a driving rod 10, a worm rolling spring 11, gears 12 and 13, bearing supports 14 and 18, an upper support plate 15, a pin 16, a lower support plate 17, a main shaft 19, a column 20, a potentiometer installing plate 21, a pressing plate 22, a support column 23, and an electrical working circuit. The utility model has the advantages of flexible structure and reliable motion, improving the stability and safety of the operation of the operating mechanism.

Description

Position feedback device with function of electrical position limitation

The utility model relates to a kind of position feedback device, especially a kind of straight stroke electric actuating mechanism usefulness of industrial automation instrument, and the position feedback device of electric limit function is arranged.

At present the position feedback device of the straight stroke electric actuating mechanism of China's industrial automation instrument all with differential transformer as position sensing element.This component size is big, Heavy Weight.Because the mode of motion of the movable member of this element is a rectilinear motion, so leverage is set as movement conversion and transmission mechanism between actuator stem and differential transformer.Its complex structure, design and calculation method is numerous and diverse, and the design cycle is very long, and the movement conversion precision is low, and theoretical error is big, and increases along with the increase of topworks's rated travel, has influenced the control accuracy of topworks and instrument system.In addition, the topworks that produces is not provided with electric stop means at present, break down when instrument system or topworks and can only stop that actuator stem continues motion by mechanical stop limiter when actuator stem reaches the limit of the position, motor the stall phenomenon occurs and can not report to the police at this moment, can not in time find and handle as operating personnel motor or bigger accident then very easily to occur burning; If mechanism's stop means lost efficacy then very easily damaged valve, or other governor motion causes bigger loss, the safety of serious threat topworks and The whole control system.

The purpose of this utility model is in order to provide a kind of simple in structure and have a position feedback device of electric limit function.

The position feedback device of this straight stroke electric actuating mechanism with electric limit function, by the toothed axle sleeve 3 in upper end,

shaft gear

5,6, four microswitches 7, four cams 8, conductive plastic potentiometer 9, drive link 10, scroll spring 11, gear 12,13,

bearing seat

14,18, upper bracket plate 15, pin 16, lower carriage plate 17, vertical shaft 19, column 20, potentiometer installing plate 21, pressing plate 22, pillar 23 and electrical installation circuit are formed, it is characterized in that the toothed bearing holder (housing, cover) 3 in upper end is sleeved on the outside of leading screw 4 of the speed reduction unit of electric operator, the worm gear 1 of its lower end and topworks's speed reduction unit links together by screw, and nut 2 usefulness keys and worm gear link together the two ends up and down of shaft gear 5 by the upright lower carrier plates 15 that are contained in of bearing seat 14, the centre position of 17 1 sides, the tooth engagement of the lower tooth of shaft gear 5 and bearing holder (housing, cover) 3, the last tooth of shaft gear 5 and gear 13 engagements, gear 13 fixes by the bottom of pin 16 with shaft gear 6, this shaft gear 6 is by bearing seat 18 upright being contained on the upper supporting plate 15, rivet clasp vertical shaft 19 on the opposite side of upper bracket plate 15, suit tetrad cam 8 on vertical shaft 19, the below of this tetrad cam 8 connects a sheet gear 12 with screw, this sheet gear 12 and shaft gear 6 engagements, in the shrinkage pool in the middle of below cam 8 scroll spring 11 is housed, the outer ring end of spring 11 is a hook solid, this crotch is hooked on the breach at cam 8 shrinkage pool edges, the inner ring of spring 11 is a square hole, and this square hole is enclosed within on the square platform of vertical shaft 19 lower ends.On last expenditure frame plate 15 around the cam 8 four columns 20 of rivet clasp, the big hole that potentiometer installing plate installing plate 21 centers are housed in column 20 upper ends is concentric with vertical shaft 19.Conductive plastic potentiometer 9 is housed on installing plate 21, the rotating shaft of potentiometer 9 is in the big hole of installing plate 21, in the rotating shaft cross-drilled hole of potentiometer 9, drive link 10 is housed, the other end of drive link 10 is inlaid in the groove of upper cover plate of cam 8, cam 8 one side rivet clasps on upper bracket plate 15 have two pairs of pillars 23, a pair of microswitch 7 all is housed on every pair of pillar 23, four microswitches 7 are vertically alternately corresponding with four cams, and the electrical installation circuit is connected with the motor of topworks.

Below in conjunction with accompanying drawing architectural feature of the present utility model is further specified:

Figure one is a configuration diagram of the present utility model, and wherein worm gear 1, nut 2, and screw mandrel 4 is the part on the former straight stroke electric actuating mechanism, and in addition other each parts are structural member of the present utility model, and each part all can adopt to know part.

Fig. 2 is an electrical installation wiring diagram of the present utility model, is by capacitor C, control circuit A, four microswitches.And connection terminal (have 7～10 set of contact to) forms, and wherein control circuit journey A is an existing line, and C is a capacitor, and x11:1～3 are the motor plugs seat, and x11:1 is the neutral line of motor plugs seat, and x11:2 is the forward phase line, and x11:3 is reverse phase line.X1～4 are the electric spacing terminal of terminal, and x5～10 are centre position display alarm terminal, and S7-3～4 are the electric position limited inching switch of terminal, and S7-1～2 are the centre position microswitch.M is that motor is the single-phase capacitance phase-splitting servomotor in the former topworks, has 4 of two windings to lift one's head, wherein two windings play termination center line x11:1, the end of two windings meets forward phase line x11:2 and reverse phase line x11:3 respectively.On the upper bracket plate 15 in Fig. 1 cam left side rivet clasp have 2 pairs of pillars 23 wherein two pillars 23 be high pillar, 2 microswitches are installed on it are followed successively by the 1st and the 3rd from top to bottom, two pillars 23 are low pillar in addition, two microswitches are installed on it, be followed successively by the 2nd and the 4th from top to bottom, 4 switches of these two row are from top to bottom alternately arranged, be followed successively by the 1st to the 4th number with cam corresponding one by one (permanent marker is arranged on the cam cover) from top to bottom, screw mandrel 4 is the top (off-position) of topworks's rated travel when being in (it is the longest promptly to stretch out casing) bottom of mechanism; Leading screw 4 is the end (opening the position) of topworks's rated travel when being in the top (it is the shortest promptly to stretch out casing) of mechanism, when leading screw 4 is in top, adjust the 4th cam, make it to push down the 4th microswitch, then the 4th cam---microswitch is carried out the electric limit function in top; When leading screw is in end, adjust the 3rd cam, make it to push down the 3rd microswitch, then the 3rd cam---microswitch is carried out terminal electric limit function, ratio of gear according to the gear mechanism that designs, leading screw is approximately 290 ° of rotations of cam when mobile in rated travel, and the angle design of the flange on work piece of cam has enough allowances to make it the living interference of industry less than 40 °, (promptly when the 3rd cam pushed down the 3rd microswitch, the 4th cam can not pushed down the 4th microswitch, vice versa) when motor is rotated in the forward, leading screw 4 moves up, cam is rotated counterclockwise, when leading screw runs to rated travel terminal, the 3rd cam pushed down the 3rd microswitch, the break contact that is connected on the 3rd microswitch in the motor forward circuit disconnects, cut off the power supply of motor, motor stops operating, leading screw stops to move, the moving together contact closure of the 3rd microswitch, can pass through external circuits display alarm, when the motor reverse rotation, leading screw 4 moves down, cam clockwise rotates, when leading screw 4 runs to the top of rated travel, the 4th cam pushed down the 4th microswitch, the break contact that is connected in the motor negater circuit disconnects, motor power is cut off, motor stops operating, leading screw 4 stops to move, the moving together contact closure of the 4th microswitch, can report to the police by external circuits demonstration meaning and examine, the 1st～2 cam---microswitch can be realized display alarm and the operation handoff functionality of leading screw in selected arbitrarily centre position, if when having two centre positions to control, using the 1st cam---microswitch is controlled the centre position near the rated travel end, using the 2nd cam---microswitch is controlled the centre position near rated travel top, when leading screw moves to this position, corresponding cam is pushed down corresponding microswitch, the break contact of this microswitch disconnects, and the moving together contact closure can be carried out display alarm and operation switching by external circuits.

The cam structure dexterity of this device, reliable in action, it is neat convenient when one of them cam is adjusted to adjust, this cam adjustment finished locked immediately when other cam was all locked, being in operation can not change, and has improved stability, reliability and the security of topworks's running.

Claims

A kind of straight stroke electric machine topworks is with the position feedback device with electric limit function, main bearing holder (housing, cover) by upper end band gear, shaft gear, four microswitches, four cams, conductive plastic potentiometer, drive link, scroll spring, gear, bearing seat, pin, last undershoot frame plate, vertical shaft, column, the potentiometer installing plate, pressing plate, pillar and electrical installation circuit are formed, the bearing holder (housing, cover) that it is characterized in that upper end band gear is sleeved on the lateral surface of leading screw of the speed reduction unit of electric operator, the worm gear of its lower end and topworks's speed reduction unit links together by screw, and nut links together with key and worm gear, the two ends up and down of shaft gear are by the upright centre position that is contained in lower carrier plate one side of bearing seat, the tooth engagement of the lower tooth of shaft gear and rotating shaft cover, the last tooth and the gearing mesh of shaft gear, gear fixes by the bottom of pin and another shaft gear, this shaft gear is contained on the upper bracket plate by bearing seat is upright, rivet clasp vertical shaft on the opposite side of upper bracket plate, suit tetrad cam on vertical shaft, the below of this tetrad cam connects a sheet gear with screw, this sheet gear and shaft gear engagement, in the shrinkage pool in the middle of below cam a scroll spring is housed, the outer ring end of spring is a hook solid, this crotch is hooked on the breach at cam shrinkage pool edge, the inner ring of spring is a square hole shape, this square hole is enclosed within on the square platform of vertical shaft lower end, on the upper bracket plate around the cam four columns of rivet clasp, in the column upper end potentiometer installing plate is housed, the big hole at installing plate center is concentric with vertical shaft, conductive plastic potentiometer is housed on installing plate, the rotating shaft of potentiometer is in the big hole of installing plate, in the rotating shaft cross-drilled hole of potentiometer, drive link is housed, the other end of drive link is inlaid in the groove of cam upper cover plate, cam one side rivet clasp on the upper bracket plate has two pairs of pillars, a pair of microswitch all is housed on every pair of pillar, four microswitches are vertically alternately corresponding with four cams, and the electrical installation circuit is connected with the motor of topworks.