CN102588666B

CN102588666B - Cam type multi-gear valve position switcher

Info

Publication number: CN102588666B
Application number: CN201110005886.5A
Authority: CN
Inventors: 洪华; 孔利明; 陈又申
Original assignee: Baoshan Iron and Steel Co Ltd
Current assignee: Baoshan Iron and Steel Co Ltd
Priority date: 2011-01-12
Filing date: 2011-01-12
Publication date: 2014-04-30
Anticipated expiration: 2031-01-12
Also published as: CN102588666A

Abstract

The invention discloses a cam type multi-gear valve position switcher, which comprises a casing, a rotary rod with cams, and a position sensing telescopic rod. A plurality of gear grooves and the corresponding cams are arranged on the rotary rod, a knob is used for performing zero setting and pulling the rotary rod to move, an elastic positioning pin in the casing clamps the corresponding gear groove, a pulley of the position sensing telescopic rod exactly contacts with the cam of a specification corresponding to the gear, and actuating mechanisms can work through cams of different specifications, so that travels of the actuating mechanisms with different travels can be switched only by the switcher.

Description

Cam type multi-gear valve position switcher

Technical field

The present invention relates to valve position switcher, more particularly, relate to a kind of Cam type multi-gear valve position switcher.

Background technique

In thermal power generation unit, the actuator of automation control area is one of important component part of systematic parameter adjusting.Along with the raising that extensive utilization and the control of Distributed Control System require, on-the-spot actuator, except completing regulatory function, also needs concrete working condition to feed back to Distributed Control System, for operations staff's judgement and monitoring.It is that current signal sends back Distributed Control System by the aperture dynamic translation of actuator that the realization of this function must rely on necessary valve position switcher, to meet automatic demand for control.Once valve position switcher fault, actuator has just lost the condition of automatic adjusting, for overheated, the system such as hot cooling water again of thermal power generation unit, the manual tune of actuator cannot require in normal response control, to the security threat of unit, is therefore also direct.

Be arranged on valve position switcher in actuator when work, by the cocking lever being connected with actuator, aperture is changed to the differential transformer passing in conversion links, aperture changes to be deflected magnetic core and produces differential electrical potential, then exports corresponding 4～20mA electrical signal to control system.Refer to shown in Fig. 1, Fig. 2, at present, the on-the-spot valve position switcher using is many by cam 1 conduct conversion transfer unit.Converter model is different because of cam 1 Curve Design, and structure, apparent size and the working principle of all the other conversion portions are all identical.During rotary work, actuator is with moving cam 1 to rotate by swingle 2, the cam 1 operating angle variable quantity thus the straight journey displacement variable of actuator being converted to, and by the pulley 4 of position sensing flexible rod 3, drive the magnetic core of converting unit to deflect to produce differential electrical potential.Differential electrical potential is processed and is exported as current signal through voltage, current conversion again after amplifying.± 22.5 ° with the valve position switcher of ± 45 ° of two kinds of specifications, its cam work state is respectively referring to shown in Fig. 3 a～Fig. 3 d.

In valve position switcher due to the cams configuring in the actuator of a lot of power generation site, different according to stroke conversion, generally be divided into ± 22.5 ° and ± 45 ° of two specifications, this device context use amount, consumption are all very large, and spare part import unit price of procurement is up to 9233 yuan/platform.Parts Inventory must be equipped with the floor stock amount of two kinds of type rule simultaneously, has so increased the consumption of supplies expenses.Conventional consumption with installation amount 5% calculates, and the valve position switcher installation amount of every unit cams is 300, adds up to the consumption overall cost of three units just to approach for 400,000/year.In addition, in Renewal process, because the conversion equipment outward appearance of two kinds of models there is no significant difference, only in the structure of inner driving cam plate, exist different, so also occur time and again to select mistake to cause affecting equipment because of professional etiquette during work, recover the normal time, this has all brought recessive threat and economic loss to safety and usefulness of thermal power generation unit.

Summary of the invention

For the above-mentioned shortcoming existing in prior art, the object of this invention is to provide a kind of Cam type multi-gear valve position switcher, this transducer can dynamically carry out the conversion of many gears to the aperture of actuator.

For achieving the above object, the present invention adopts following technological scheme:

This Cam type multi-gear valve position switcher comprises swingle and the position sensing flexible rod of housing, strap cam, swingle is through housing, position sensing flexible rod one end is provided with pulley and stretches in housing, contact with cam sagittal plane, described swingle is provided with successively the cam of several gear grooves and the different size corresponding with gear groove quantity in enclosure interior section; On two traversing through end of swingle, be equipped with outer back-up ring, and be also provided with the knob with position indicateing arm point on a traversing through end; In described housing, be also provided with a pair of elastic positioning pin in order to gear location, the end of elastic positioning pin snaps in corresponding gear groove.

The quantity of described gear groove is at least two, and the distance between each gear groove and corresponding cam all equates.

Described swingle is also arranged with retractable dust-proof cover in the outer back-up ring outside of another traversing through end, and retractable dust-proof cover top is pressed from both sides with the traversing through end of swingle and fixed by catch, and bottom is connected on housing outer wall.

Described cam is sheathed on swingle, and fixes by screw and swingle, is also provided with partition ring between cam.

Described swingle also overlaps and has extendible standby pad and inner shield ring successively in enclosure interior section.

In technique scheme, Cam type multi-gear valve position switcher of the present invention comprises housing, the swingle of strap cam and position sensing flexible rod, swingle is provided with multiple gear grooves and corresponding cam, by knob, return to zero and pull swingle to move, make the elastic positioning pin in shell block corresponding gear groove, and just in time make the pulley of position sensing flexible rod contact with the cam of this gear corresponding specification, make actuator to carry out work with different specification cams, thereby reach, only need a transducer just can realize the stroke conversion demand of the actuator to different strokes.

Accompanying drawing explanation

Fig. 1 is that the specification of prior art is the sectional view of the cam valve bit pad of ± 45 °;

Fig. 2 is that the specification of prior art is the sectional view of the cam valve bit pad of ± 22.5 °;

Fig. 3 a, Fig. 3 b are respectively complete shut-down and the full-gear schematic diagram of the transducer in Fig. 1;

Fig. 4 a, Fig. 4 b are respectively complete shut-down and the full-gear schematic diagram of the transducer in Fig. 2;

Fig. 5 is the sectional view of Cam type multi-gear valve position switcher of the present invention;

Fig. 6 is the stereogram of the rotating shaft of transducer of the present invention;

View when Fig. 7 is knob zeroing of the present invention;

Fig. 8 a, Fig. 8 b are respectively the working state schematic representations of two gear different size cams of the transducer in Fig. 5;

Fig. 9 is the workflow schematic diagram of transducer of the present invention.

Embodiment

Below in conjunction with drawings and Examples, further illustrate technological scheme of the present invention.

Refer to shown in Fig. 5, what Cam type multi-gear valve position switcher of the present invention was same as the prior art is, equally also comprise swingle 12 and the position sensing flexible rod 13 of housing 10, strap cam 11, swingle 12 is through housing 10, position sensing flexible rod 13 one end are provided with pulley 14 and stretch in housing 10, contact with cam 11 sagittal planes.Difference is, this swingle 12 is from left to right provided with successively the cam 11 of several gear grooves 15 and the different size corresponding with gear groove 15 quantity in housing 10 inner section, wherein, the quantity of gear groove 15 is at least two, and the distance between each gear groove 15 and corresponding cam 11 all equates.Gear groove 15 quantity shown in Fig. 5, Fig. 6 are two, can certainly be three or more, and the quantity of cam 11 is identical with gear groove 15 numbers, and specification difference, as ± 15 °, ± 30 °, ± 22.5 ° and ± 45 ° etc., as the specification of two cams 11 in Fig. 5 be respectively ± 22.5 ° and ± 45 °.Each cam 11 is all sheathed on swingle 12, and fixing with swingle 12 by retaining screw 16, is also provided with partition ring 17 between cam 11.And on two traversing through end of swingle 12, be equipped with outer back-up ring 18, when pulling swingle 12 to move, play position-limiting action.And, outer back-up ring 18 left sides at left side traversing through end are also provided with the knob 19 with position indicateing arm point 191, knob 19 fixes by locking nut 192 and swingle 12, when rotation can driven rotary bar 12 during knob 19 and cam 11 be rotated, and by position indicateing arm point 191 indication angle of swing.In housing 10, be also provided with a pair of elastic positioning pin 20 in order to gear location, when pulling swingle 12 to move, the end of elastic positioning pin 20 can snap in corresponding gear groove 15, not only play gear positioning action, and because the distance between each gear groove 15 and corresponding cam 11 all equates, therefore its corresponding cam 11 just in time can contact with the pulley of position sensing flexible rod 13 14.Outer back-up ring 18 outsides at swingle 12 right side traversing through end are also arranged with retractable dust-proof cover 21, retractable dust-proof cover 21 tops press from both sides 22 by catch and fix with the traversing through end of swingle 12, bottom is by being welded on housing 10 outer walls, this retractable dust-proof cover 21 not only can play dustproof effect, but also can pulling and stretch with swingle 12.In addition, at swingle 12, in housing 10 inner section, also overlap and have extendible standby pad 23 and inner shield ring 24 successively, this standby pad 23 not only can be used in cam expansion, but also can prevent that the pulley 14 that swingle 12 moves the position sensing flexible rod 13 overexerting and cause from skidding off cam 11 working surfaces.When standby pad 23 displacements expand to cam 11, the outer back-up ring 18 on right side can be removed, to guarantee that swingle 12 has enough shift motions.

Shown in Fig. 7～Fig. 9, the working principle of Cam type multi-gear valve position switcher of the present invention is as follows:

Having ± two grades of valve position switchers of 22.5 ° and ± 45 ° of specification cams 11 are as example, when the position transducer of actuator needs pattern to switch, by rotating knob 19 and position indicateing arm point 191 being made zero, thereby driven rotary bar 12 and cam 11 rotate, and make all gearshift (see figure 7)s in non-working surface of two cams 11, now, the stroke conversion demand different according to actuator, select corresponding cam 11, clutch knob 19 and firmly inwardly pull out swingle 12, if hear " loud, high-pitched sound reaches " sound, show that elastic positioning pin 20 snaps in corresponding gear groove 15, if silent, need to observe knob 19 heights and knob 19 scales, if correctly, again pull swingle 12, until elastic positioning pin 20 locks corresponding gear groove 15, now vernier knob 19, make knob 19 rotating scales be greater than 1 °, if without hindrance, the cam 11 that corresponding specification is described puts in place, Fig. 8 a (is seen respectively in the position of the pulley 14 in position sensing flexible rod 13, Fig. 8 b), if there is obstruction, illustrate that cam 11 switching positions are also incorrect, need to again return to zero and again switch.After cam 11 switchings put in place, knob 19 is adjusted to working position the locking (± 22.5 ° or ± 45 °) of respective cams 11, now the pulley 14 of position sensing flexible rod 13 contacts with the working surface of this cam 11, in order to carry out the conversion process of actuator, finally observing the instrument line item of going forward side by side puts on record, complete gear-change operation, recover the working state of actuator.

In sum, adopt valve position switcher of the present invention, not only simple in structure, easy to use, and plural cam can be integrated, by the switching between corresponding gear groove, thereby realize the valve position conversion of using a valve position switcher can meet many gears, greatly reduce the user cost of enterprise and join goods amount, also reduced maintenance cost and the dependence to import accessory of thermal power generation unit simultaneously, for surmounting original performance of import equipment, provide and provide powerful support for.

Those of ordinary skill in the art will be appreciated that, above embodiment is only for the present invention is described, and be not used as limitation of the invention, as long as within the scope of connotation of the present invention, variation, modification to the above embodiment all will drop within the scope of claims of the present invention.

Claims

1. a Cam type multi-gear valve position switcher, comprises swingle and the position sensing flexible rod of housing, strap cam, and swingle is through housing, and position sensing flexible rod one end is provided with pulley and stretches in housing, contacts with cam sagittal plane, it is characterized in that:

Described swingle is provided with successively the cam of several gear grooves and the different size corresponding with gear groove quantity in enclosure interior section; On two traversing through end of swingle, be equipped with outer back-up ring, and be also provided with the knob with position indicateing arm point on a traversing through end;

In described housing, be also provided with a pair of elastic positioning pin in order to gear location, the end of elastic positioning pin snaps in corresponding gear groove.

2. Cam type multi-gear valve position switcher as claimed in claim 1, is characterized in that:

3. Cam type multi-gear valve position switcher as claimed in claim 1, is characterized in that:

4. Cam type multi-gear valve position switcher as claimed in claim 1, is characterized in that:

5. Cam type multi-gear valve position switcher as claimed in claim 1, is characterized in that: