CN201651510U - Secondary torque control switch mechanism of valve electric device - Google Patents

Abstract

The utility model discloses a secondary torque control switch mechanism of a valve electric device, comprising a base, wherein a crank is fixed on the base by a crankshaft; the crankshaft at the upper part of the base is provided with a moment bidirectional cam; the left end of the moment bidirectional cam is provided with an adjusting bolt; the moment bidirectional cam and a cam adjuster are coaxially arranged; the cam adjuster is provided with a scale dial; the base at the right side of the moment bidirectional cam is provided with a microswitch which corresponds to the right side of the moment bidirectional cam; the base at the left side of the moment bidirectional cam is provided with a swinging hook which corresponds to the left side of the moment bidirectional cam; the left end of the base is provided with a miniature circuit breaker on which a mobile hook is arranged; and the mobile draw hook and the swinging hook are connected in a locking-hanging manner. The secondary torque control switch mechanism has advantages of simple and compact structure and small volume, realizes two-stage torque protection of electrical control and mechanical control, and is further provided with emergency manual cut-off protection, thus having complete protection mechanisms and being capable of ensuring the safety of valves and motors.

Description

Electric device for valve secondary torque control switch mechanism

Technical field

The utility model belongs to valve technology field, relates to a kind of valve torque control motor drive mechanism specifically.

Background technique

Electric device for valve is a kind of driving arrangement of opening/shutting valve, with the supporting use of valve, is applied in industries such as metallurgy, chemical industry, coal gas, plumbing, and application area is very extensive.These industries or department are very high to the quality requirement of Electric actuator and valve, function such as product performance are reliable and stable, control accuracy is high, have overload protection, remote centralized control.But valve in actual use, often because of some odjective cause causes valve opening and closing difficulty or stuck, in case this type of situation takes place, opens and closes the damage that will inevitably cause valve or Electric actuator by force, even cause bigger security incident.Generally adopt at present in electrical control torque to control in the known technology to electric device for valve.This torque controling mechanism control accuracy is low, operates loaded down with trivial detailsly, relies on commissioning staff's experience to be set fully.Torque is adjusted excessive, and output torque just increases, in case be subjected to the influence of certain inside or extraneous factor, stuck phenomenon appears in valve, very easily damages component even whole valve in the Electric actuator; It is too small that torque is adjusted, and output torque is less than normal, causes valve opening not in place or be not enough to valve is closed dead.Therefore adopt the torque controling mechanism of present existing electric device for valve, its output torque is widely different, has many potential safety hazards.As Chinese utility model patent " valve torque control Electric actuator ", application number is 200820031710.0, the applying date is on November 12nd, 2008, this model utility comprises motor-operating mechanism, the housing of moment output mechanism and described Electric actuator, establish on the described motor-operating mechanism worm screw and with the moment output mechanism on worm gear engagement, described worm screw is the unsteady installation of axial Spring balanced on described housing, described Electric actuator also is provided with highi degree of accuracy valve torque controling mechanism and is connected with worm drive, establish the torque gear shaft in the described highi degree of accuracy valve torque controling mechanism, it is by the engagement of the corresponding profile of tooth on profile of tooth on the torque gear shaft and the described worm screw that described highi degree of accuracy valve torque controling mechanism is connected with worm drive, described torque gear shaft is connected with switch on the motor-drive circuit that is serially connected in described Electric actuator by cam mechanism, forms the control structure to described motor start and stop.The structure of described worm screw unsteady installation of axial Spring balanced on described housing is: the belleville spring that axle head suit one assembly of described worm screw is fitted to bead, one end of described belleville spring contacts with the bearing inner race step of supporting worm screw, and the other end contacts with end cap on the housing by plane bearing; The outer ring of described bearing is fixed on the housing.The meshing engagement structure of described torque gear shaft and worm screw is: on the described worm screw with described worm gear engaged worm thread form outside, be provided with annular rack near a section of belleville spring, the profile of tooth on described annular rack and the torque gear shaft meshes.Described highi degree of accuracy valve torque controling mechanism is established mounting plate and is fixed on the described housing, switch on the motor-drive circuit of described Electric actuator is sensitive switch and is fixed on the described mounting plate, described cam mechanism is: an end opposite with the worm meshing profile of tooth on described torque gear shaft, be provided with cam and cam adjustment support, described cam adjustment support is fixed on cam on the torque gear shaft, contacts with sensitive switch contact on the described sensitive switch by the cam gabarit.Described cam, cam adjustment support and sensitive switch are two, form the mechanism of two groups of control switch actions, two cams distribute in the axial front and back of torque gear shaft, the outer profile of its cam is for passing through its rightabout rotation, control described motor power break-make, and the circuit of two sensitive switch controls is connected in series.Described sensitive switch is provided with the switch reed of fixedlying connected with it, slides on the switch reed during described cam rotation, and described cam promotes sensitive switch contact on the sensitive switch by the switch reed.Described cam adjustment support is provided with direction board and adjusting axle, and described direction board is pressed on the cam adjustment support by pressure spring by adjusting axle, and its surface is provided with scale; Described adjusting axle is established indicating arrow on end face.This model utility adopts the control accuracy that has improved the Electric actuator output torque, accurately realizes the one-level control of torque overload protection.Can effectively prevent valve when breaking down,, eliminate potential safety hazard, improve the working life of valve and Electric actuator because of the inoperative or not enough all kinds of problems that cause of control accuracy of Electric actuator overload.But can't deenergization when A.C. contactor breaks down.Also has a kind of electronic protective gear that can realize second class protection; as Chinese utility model patent " electric device for valve comprehensive protection device "; application number is 02229372.8; the applying date is on April 9th, 2003; this model utility comprises motor; axle sleeve; worm gear; worm screw and dish spring etc.; motor is connected with worm screw by the slippage axle sleeve; the worm and wheel engagement; another axle head of worm screw is equipped with the dish spring; one circular groove is arranged on the worm screw; crank throw is housed in the groove; two-way group of plate of moment is housed on the crank shaft; two-way group of plate of moment is by tooth sector and the engagement of little shaftgear; on the little shaftgear axle pointer and dial are housed; two-way group of plate sidepiece of first moment is equipped with sensitive switch; sensitive switch is connected with A.C. contactor through signaling line; there is finger swing hook upper end; finger is located between two-way group of plate of two moments; mobile hook lock hanging on swing hook lower end and the Circuit breaker; promptly disconnect handle and be contained on the swing hook; power supply is through Circuit breaker; A.C. contactor is connected with motor; described little shaftgear is contained on the fixed plate; fixed plate is connected with crank throw; dial also is connected with fixed plate, and two-way group of plate of moment just is clipped between fixed plate and the dial, and two-way group of plate of described moment has two; one open to, pass to.This model utility has realized electrical control, machinery control two-stage force moment protection, and is provided with urgent hand off protection, and its protection mechanism is perfect, can guarantee the safety of valve and motor.But complex structure, volume is bigger, and the installation and maintenance inconvenience is not suitable for the less electric device for valve of shell space.

Summary of the invention

The purpose of this utility model just is to overcome above-mentioned deficiency, and a kind of compact structure, electric device for valve secondary torque control switch mechanism that volume is little are provided.

The purpose of this utility model can be achieved through the following technical solutions:

A kind of electric device for valve secondary torque control switch mechanism, it comprises base, crank throw is fixed on the base by crank shaft, the axle that turns on base top is provided with the moment bidirectional cam, the left end of moment bidirectional cam is provided with the adjusting bolt, the moment bidirectional cam is coaxial setting with cam adapter, cam adapter is provided with dial, the base on moment bidirectional cam right side is provided with sensitive switch, sensitive switch is corresponding with the right side of moment bidirectional cam, the base in moment bidirectional cam left side is provided with the swing hook, the swing hook is corresponding with moment bidirectional cam left side, the left end of base is provided with miniature circuit breaker, is provided with on the miniature circuit breaker to move hook, moves hook and is connected with the lock hanging of swing hook.

Above-mentioned electric device for valve secondary torque control switch mechanism, described swing hook is arranged on the base by pin.

Above-mentioned electric device for valve secondary torque control switch mechanism promptly throws off the button bearing and is fixed on the support and base of miniature circuit breaker, promptly throws off button and is arranged in the urgent disengagement button bearing, and be slidingly connected with urgent disengagement button bearing.

Above-mentioned electric device for valve secondary torque control switch mechanism, moment moment bidirectional cam, cam adapter and sensitive switch respectively have two, form open to close to two groups of secondary torque control switch mechanisms.

Adopt technique scheme; the utility model has following advantage: crank throw of the present utility model is installed in the worm screw groove of worm screw; sensitive switch is connected with A.C. contactor with signaling line; miniature circuit breaker is connected with A.C. contactor; first order force moment protection can directly cut off sensitive switch by the moment bidirectional cam; make the A.C. contactor action; cut off the electricity supply; if first class of protection lost efficacy; then crank shaft drive moment bidirectional cam is rotated further; adjusting bolt on the moment bidirectional cam is stirred the swing hook; make to move to link up with and throw off with the swing hook; then miniature circuit breaker disconnects, and only need press mobile hook during recovery downwards and can make the swing hook link up with lock hanging again with mobile, and miniature circuit breaker is closed again.The top, side that urgent bearing of throwing off button is fixed by bolts to base can directly make when pressing downwards to move to link up with the swing hook throws off, and realization is anxious to stop.The utility model is simple in structure, compact, volume is little; electrical control and machinery control two-stage force moment protection have been realized; and be provided with urgent hand off protection; its protection mechanism is perfect; can guarantee the safety of valve and motor; the utility model is installed and used with easy to maintenance, is particularly suitable for the little electric device for valve of volume.

Description of drawings

Accompanying drawing is a structural representation of the present utility model.

Embodiment

A kind of as shown in drawings electric device for valve secondary torque control switch mechanism, it comprises base 1, crank throw 11 is fixed on the base 1 by crank shaft 10, the axle that turns on base top is provided with moment bidirectional cam 8, the left end of moment bidirectional cam 8 is provided with regulates bolt 12, moment bidirectional cam 8 is coaxial settings with cam adapter 6, cam adapter 6 is provided with dial 7, the base on moment bidirectional cam right side is provided with sensitive switch 9, sensitive switch 9 is corresponding with the right side of moment bidirectional cam 8, the base in moment bidirectional cam left side is provided with swing hook 13, swing hook 13 is corresponding with moment bidirectional cam left side, the left end of base is provided with miniature circuit breaker 15, be provided with on the miniature circuit breaker 15 and move hook 2, moving hook 2 is connected with 13 lock hangings of swing hook, described swing hook 13 is arranged on the base 1 by pin, the urgent button bearing 4 of throwing off is fixed on the support and base 1 of miniature circuit breaker, the urgent button 3 of throwing off is arranged in the urgent disengagement button bearing 4, and be slidingly connected with urgent disengagement button bearing, moment moment bidirectional cam, cam adapter and sensitive switch respectively have two, form open to close to two groups of secondary torque control switch mechanisms.

Working principle of the present utility model is as follows: motor is connected with worm screw by the slippage axle sleeve, the worm and wheel engagement, worm screw is provided with the worm screw groove, crank throw of the present utility model is installed in the worm screw groove of worm screw, switch is connected with A.C. contactor with signaling line, miniature circuit breaker is connected with A.C. contactor, moment bidirectional cam 8 is housed on the crank shaft, and set by 6 pairs of moments of cam adapter, dial 7 is installed on the cam adapter 6, and the moment difference of the second level and the first order is set by regulating bolt 12.Swing hook 13 usefulness pins 14 are installed on the side of base; first order force moment protection can directly cut off sensitive switch 9 by cam; make the A.C. contactor action; cut off the electricity supply; if first class of protection lost efficacy; then crank shaft 10 drive cams 8 are rotated further; adjusting bolt on the moment bidirectional cam 8 is stirred swing hook 13; make mobile hook 2 and 13 disengagements of swing hook; then miniature circuit breaker 15 disconnects; only need press mobile hook 2 during recovery downwards swing hook 13 and mobile hook 2 lock hanging are again lived, miniature circuit breaker is closed again.Urgent bearing 4 usefulness bolts 5 of throwing off button 3 are fixed on the top, side of base 1, can directly make mobile hook 2 and 13 disengagements of swing hook downwards when pressing, realize anxious stopping, design function of the present utility model is similar to patent 02229372.8, but structure is compact more, rationally, volume is little, for the smaller electric device for valve of shell space, can save the space, convenient for installation and maintenance.

Claims (4)

1. electric device for valve secondary torque control switch mechanism, it is characterized in that: it comprises base (1), crank throw (11) is fixed on the base (1) by crank shaft (10), the axle that turns on base top is provided with moment bidirectional cam (8), the left end of moment bidirectional cam (8) is provided with regulates bolt (12), moment bidirectional cam (8) is coaxial setting with cam adapter (6), cam adapter (6) is provided with dial (7), the base on moment bidirectional cam right side is provided with sensitive switch (9), sensitive switch (9) is corresponding with the right side of moment bidirectional cam (8), the base in moment bidirectional cam left side is provided with swing hook (13), swing hook (13) is corresponding with moment bidirectional cam left side, the left end of base is provided with miniature circuit breaker (15), be provided with on the miniature circuit breaker (15) and move hook (2), move hook (2) and be connected with (13) lock hanging of swing hook.

2. electric device for valve secondary torque control switch according to claim 1 mechanism is characterized in that: described swing hook (13) is arranged on the base (1) by pin.

3. electric device for valve secondary torque control switch according to claim 2 mechanism, it is characterized in that: promptly throw off button bearing (4) and be fixed on the support and base (1) of miniature circuit breaker, the urgent button (3) of throwing off is arranged in the urgent disengagement button bearing (4), and is slidingly connected with urgent disengagement button bearing.

4. electric device for valve secondary torque control switch according to claim 3 mechanism, it is characterized in that: moment bidirectional cam, cam adapter and sensitive switch respectively have two, form open to close to two groups of secondary torque control switch mechanisms.

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