CN102562721A - Pneumatic long-stroke actuating mechanism and control method thereof - Google Patents
Pneumatic long-stroke actuating mechanism and control method thereof Download PDFInfo
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- CN102562721A CN102562721A CN2012100675690A CN201210067569A CN102562721A CN 102562721 A CN102562721 A CN 102562721A CN 2012100675690 A CN2012100675690 A CN 2012100675690A CN 201210067569 A CN201210067569 A CN 201210067569A CN 102562721 A CN102562721 A CN 102562721A
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Abstract
The invention relates to a pneumatic long-stroke actuating mechanism and a control method thereof. The pneumatic long-stroke actuating mechanism comprises a rack, a cylinder, a manual device and a control device, wherein a rotatable main shaft is arranged at the top part of the rack, one end of the main shaft is fixedly connected with a swinging arm, and the middle part of the main shaft is connected with a driving swinging arm; the cylinder is arranged at the lower part of the rack, the control device controls the movement of a piston of the cylinder, and a piston rod of the cylinder is fixedly connected with the driving swinging arm; and the manual device is arranged at the top part of the rack and is connected with the main shaft in a separable-transmission manner by an eccentric wrenching wheel and a worm gear. The control method comprises the following step of carrying out signal breaking, power off and air-source cutting off for protection on the actuating mechanism. The pneumatic long-stroke actuating mechanism has the advantages of strong stability, high accuracy, compact structure, light weight and convenience in installation, can be convenient to realize manual-automatic control switching, can be widely applicable to industrial departments such as power, petrochemistry, metallurgy and the like, and is especially suitable for being installed and used in high-temperature and vibrating environments.
Description
Technical field
The present invention relates to a kind of valve control device, particularly relate to a kind of pneumatic longstroke servo and controlling method thereof.
Background technique
Existing integrated type pneumatic actuator is instructed to the working spindle output services through kinematic link mechanism by Pneumatic component mostly, realizes the action of valve, air door class workpiece.Find that when reality is used above-mentioned existing pneumatic longstroke servo has some shortcomings, because of failing to reach the using effect of the best, and its shortcoming can be summarized as follows:
1, because existing pneumatic actuator adopts the mechanical type positioning work piece; And its bindiny mechanism error occurs easily in links such as processing, installation, connections; All bring influence to a certain degree for stability, the validity of actuator; And influencing system's traveling comfort and control accuracy, this and the increasingly high adjusting of automatic system require not to be complementary;
2, adopt the kind of drive of leading screw and slide block, occur the bite scene easily, be unfavorable for the environment that the condition dust is more;
3, volume is big, quality is heavy, be unfavorable for installing, and heatproof, earthquake-proof function is relatively poor;
4, existing pneumatic actuator lacks the hand automatic switching control equipment, and the hand automatic switching function is dumb, breaks down easily, often is unfavorable for the processing of situation such as accident, overhaul of the equipments, and device ' remains further to be improved.
This shows that above-mentioned existing pneumatic longstroke servo obviously still has inconvenience and defective, and demands urgently further improving in structure and use.How to found a kind of hand of can realizing easily and control switching automatically; And device stability is strong, validity is high, heat-resisting shatter-proof, compact structure, lighter weight, be beneficial to the pneumatic longstroke servo and the controlling method thereof of the new structure of installation, is that the current industry utmost point needs improved targets.
Summary of the invention
The technical problem that the present invention will solve provides a kind of pneumatic longstroke servo and controlling method thereof; Make it can realize easily that hand controls switching automatically; And device stability is strong, validity is high, heat-resisting shatter-proof, compact structure, lighter weight, be beneficial to installation, thereby overcomes the deficiency of existing pneumatic longstroke servo.
For solving the problems of the technologies described above; A kind of pneumatic longstroke servo of the present invention comprises frame, cylinder, manual operating device and control gear, and wherein: frame top is equipped with rotating main shaft; Main shaft one end is fixedly connected with swing arm, and the main shaft middle part is connected with the driving swing arm; Cylinder is installed in frame lower, the motion of control gear control cylinder piston, and the piston rod of cylinder is fixedly connected with the driving swing arm; Manual operating device is installed in frame top, is in transmission connection but pull wheel and worm and gear and main shaft clutch through off-centre.
As a kind of improvement of the present invention, described manual operating device comprises: control cylinder is the pressure type selector valve of gas circuit connection up and down; Press down or unclamp the cam of pressure type selector valve through rotation; The handle of control cam rotation; And pull the hand behaviour mechanism that wheel, worm and gear cooperate transmission with off-centre.
On frame, the inner ring of load-bearing bearing is fixedly connected with main shaft described main shaft through the load-bearing Bearing Installation, and the outer ring of load-bearing bearing is fixedly connected with frame.
Described frame comprises base, be fixed on the crossbeam that supporting frame and two ends on the base are fixedly connected with supporting frame respectively.
Described base adopts the welding of 45# steel plate to form, and supporting frame and crossbeam adopt the channel-section steel section bar, base, crossbeam and supporting frame welding.
Described cylinder piston rod is connected with U type fork-join head through screw thread, and U type fork-join head is fixedly connected with the driving swing arm through U type bolt axle.
Described control gear comprises control base plate, blocking-valve, solenoid valve, reduction valve, filter, break signal detector, intelligent positioner and feedback linkage, and wherein: the break signal detector is connected through circuit with solenoid valve; Feedback linkage connects the feedback rod that drives swing arm and intelligent positioner; The inlet end input compressed gas source of filter, the outlet side is connected with reduction valve; The outlet of reduction valve is divided into two gas circuits, and first gas circuit is connected with the middle suction port of intelligent positioner through the pressure type selector valve, and second gas circuit is connected with the gas control hole of blocking-valve through solenoid valve; The last lower production well of intelligent positioner, the last air holes through blocking-valve is connected with the cylinder up and down of cylinder respectively; First gas circuit of pressure type selector valve reduction valve output under original state connects, and switching-over back first gas circuit is closed, and the cylinder up and down of cylinder is communicated with.
In addition, the present invention also provides a kind of controlling method of above-mentioned pneumatic longstroke servo, the electric current of described break signal detector monitors solenoid valve; When electric current during less than 4mA, break off the power supply of solenoid valve, blocking-valve control gas breaks off; Inner air path breaks off, and is in the position state of protecting; When electric power disconnection, the power supply of solenoid valve breaks off, and blocking-valve control gas breaks off, and inner air path breaks off, and is in the position state of protecting; The output bleed pressure of monitoring reduction valve, when it was lower than setting value, blocking-valve breaking inner gas circuit was in the position state of protecting.
After adopting such design, the present invention has the following advantages at least:
1, adopts integrated structure design, compact structure, lighter weight;
2, high temperature resistant, vibration resistance, the upper limit temperature of heat tolerance can reach 150 ℃;
3, stable, safe and reliable, system failure rate is low, have comprise break signal, " three disconnected " protective function of the source of dying, outage, day-to-day operation is non-maintaining;
4, adopt the kind of drive of worm and gear, practical moment scope is bigger, can satisfy on-the-spot situation not of the same race;
5, the cylinder breakout pressure is low, and tunable performance is good, and the response time is fast;
6, cylinder oil-free lubrication, low gas consumption;
7, it is quick that band manual-operating mechanism, and hand is controlled easy switching automatically;
8, control accuracy is high, and Installation and Debugging are convenient.
As stated, pneumatic longstroke servo of the present invention and controlling method thereof are power with pressurized air; Accept control signal; Convert output signal corresponding switch displacement to, thus actions such as control valve, air door, baffle plate, and device stability is strong, validity is high, compact structure, lighter weight, be beneficial to installation; And can realize easily that hand controls switching automatically; Can extensively be used for industrial departments such as electric power, petrochemical industry, metallurgy, be used for devices such as remote operation butterfly valve, adjustment valve, baffle ventilation door, louvered air door, isolated door, deslagging door, be particularly suited under high temperature and vibration environment, installing and using.
Description of drawings
Above-mentioned only is the general introduction of technological scheme of the present invention, understands technological means of the present invention in order can more to know, below in conjunction with accompanying drawing and embodiment the present invention is done further detailed description.
Fig. 1 is the structural representation of pneumatic longstroke servo of the present invention.
Fig. 2 is the side-looking structural representation of Fig. 1.
Fig. 3 is that circuit, the gas circuit of pneumatic longstroke servo of the present invention connects schematic representation.
Embodiment
See also Fig. 1, shown in Figure 2, a kind of pneumatic longstroke servo of the present invention comprises frame, cylinder 26, manual operating device and control gear.
Wherein, frame top is equipped with rotating main shaft 17, and main shaft 17 1 ends are fixedly connected with swing arm 19, and main shaft 17 middle parts are connected with and drive swing arm 12, also back-up ring 18 can be installed in swing arm 19 outsides.Specifically; Frame can be welded by base 1, supporting frame 23 and crossbeam 10, and base 1 can adopt the welding of 45# steel plate to form, supporting frame 23 and the crossbeam 10 preferred channel-section steel section bars that adopt; Supporting frame 23 adopts welding manner to be fixed on the base 1, and crossbeam 10 two ends are fixedly connected with supporting frame 23 respectively.Main shaft 17 is installed on the frame through load-bearing bearing 16, and the inner ring of load-bearing bearing 16 is fixedly connected with main shaft 17, and the outer ring of load-bearing bearing 16 is fixedly connected with frame through bearing (ball) cover 28.The frame that is welded satisfies the mechanics requirement that these pneumatic actuator all directions are carried through Mechanics Calculation, and ball bearing is carried in the load-bearing that the bearing of load-bearing simultaneously 16 is selected for use, guarantees that bearing is not easy to wear under mechanism's long-time running and the stress.
The piston rod of cylinder 26 is fixedly connected with driving swing arm 12.The high temperature resistant cylinder of imported with original packaging of cylinder 26 preferred good seal performance, band buffering can be fixedly mounted on frame lower through air cylinder base 24 and base bearing pin 25.Specifically, be threaded between the piston rod of cylinder 26 and the U type fork-join head 27, U type fork-join head 27 is fixedly connected with driving swing arm 12 through U type bolt axle 11, and drive swing arm 19 is moved.
Please cooperate and consult shown in Figure 3ly, the piston motion of control gear control cylinder 26 comprises control base plate 2, blocking-valve 3, solenoid valve 4, reduction valve 5, accurate filter 6, break signal detector 7, intelligent positioner 8 and feedback linkage 9.Get into accurate filter 6 according to compressed gas source shown in Figure 3 through the PU flexible pipe; Accurate filter 6 and reduction valve 5 are through linking together to silk; Pressurized air exports from reduction valve 5 and separates two-way through the threeway quick inserting joint, and one road pressurized air gets into through the import under pressure type selector valve 29 original states, discharges from the air outlet to get into intelligent positioner 8 middle suction ports; Other one road pressurized air gets into solenoid valve 4; Solenoid valve 4 gets electric, and gas circuit is opened, and the gas control hole of pressurized air blocking-valve 3 gets into blocking-valve 3.Two air outlet holes up and down of intelligent positioner 8; The gas that comes out gets into two inlet holes up and down of blocking-valve 3 respectively; Two air outlet holes up and down through blocking-valve 3 get into respectively in the cylinder up and down of cylinder 26, thereby the principle of the air driven cylinder that contracts under this mechanism's auto state is pressed in realization.The pressurized air that comes out from blocking-valve 3 gets into inlet hole and the air outlet hole after 29 switching-overs of pressure type selector valve in the cylinder up and down that gets into cylinder 26 respectively.Suction port is communicated with the air outlet after 29 switching-overs of pressure type selector valve, and cylinder cylinder up and down is communicated with, thereby realizes the principle that use man-operated mechanism 20 drives under this mechanism manual state.
During work, pneumatic longstroke servo receives command signal, and the suction pressure through intelligent positioner 8 control cylinders cylinder about in the of 26 comes the switching position of control cylinder 26 upper piston groups, and actuator is regulated, and exports corresponding moment simultaneously.Feedback function module through in the intelligent positioner 8 is exported to DCS to mechanism's physical location feedback signal, thereby can monitor the present situation of this mechanism.Pressurized air filters through accurate filter 6, and reduction valve 5 0.55Mpa that reduces pressure gives actuator as power source, promotes moment of cylinder 26 piston set output and drives air door, valve or baffle plate.
The controlling method of pneumatic longstroke servo of the present invention adopts " three is disconnected " to protect the position design:
Protection when losing signal: when electric current passed through signal detector 7 less than 4mA, signal detector 7 broke off through the power supply that comparison operation outputs to solenoid valve 4, solenoid valve 4 switching-overs; Gas circuit is broken off; Blocking-valve 3 control gas are broken off, blocking-valve 3 actions, inner air path breaks off; Be in and protect the position state, realize break signal guarantor bit function;
The source protection of dying: when bleed pressure was lower than 0.3MPa (or any setting value), blocking-valve 3 itself can the breaking inner gas circuits, are in and protect a position state, realize dying guarantor's bit function;
Power-off protection: when electric power disconnection, the power supply of solenoid valve 4 breaks off, solenoid valve 4 switching-overs, and gas circuit is broken off, and makes blocking-valve 3 control gas disconnections, blocking-valve 3 actions, inner air path breaks off, and is in the position state of protecting, and bit function is protected in the realization outage.
Manual operating device is installed in frame top, is in transmission connection with main shaft 17 clutches with hand behaviour mechanism 20 but pull wheel 31 through off-centre, realizes manually switching with operation automatically, and under manual mode, drives through main shaft 17 and drive swing arms 12 and move.Specifically, manual operating device comprises pressure type selector valve 29, cam 30, handle 32 and hand behaviour mechanism 20.Pressure type selector valve 29 is installed on the frame through selector valve support 22, the connection of control cylinder gas circuit about in the of 26.Handle 32 control cams 30 rotate, and utilize the specific form of cam 30 to reach the purpose that presses down or unclamp pressure type selector valve 29.Hand behaviour mechanism 20 pulls wheel 31 with off-centre and cooperates transmission.
If because of the needs of production run, in the time of carrying out manually-operable, rotate through handle 32 control cams 30 earlier; Depress pressure type selector valve 29; 29 switching-overs of pressure type selector valve, cylinder is the connection of cylinder gas circuit, pressure balance about in the of 26, pulls wheel 31 through off-centre simultaneously; Make the worm gear of hand behaviour mechanism 20 cooperate transmission, realize manually-operable with worm screw; Grasp mechanism 20 when hand and reach under the auto state, the worm gear of hand behaviour mechanism 20 separates with worm screw, and cam 30 separates with pressure type selector valve 29 through rotating simultaneously; 29 switching-overs of pressure type selector valve; Cylinder about in the of 26 the cylinder gas circuit close, gas circuit is communicated with the outlet up and down of intelligent positioner 8 respectively, realizes automatic function.
The above; It only is preferred embodiment of the present invention; Be not that the present invention is done any pro forma restriction, those skilled in the art utilize the technology contents of above-mentioned announcement to make a little simple modification, equivalent variations or modification, all drop in protection scope of the present invention.
Claims (8)
1. a pneumatic longstroke servo is characterized in that comprising frame, cylinder, manual operating device and control gear, wherein:
Frame top is equipped with rotating main shaft, and main shaft one end is fixedly connected with swing arm, and the main shaft middle part is connected with the driving swing arm;
Cylinder is installed in frame lower, the motion of control gear control cylinder piston, and the piston rod of cylinder is fixedly connected with the driving swing arm;
Manual operating device is installed in frame top, is in transmission connection but pull wheel and worm and gear and main shaft clutch through off-centre.
2. pneumatic longstroke servo according to claim 1 is characterized in that described manual operating device comprises:
Control cylinder is the pressure type selector valve of gas circuit connection up and down;
Press down or unclamp the cam of pressure type selector valve through rotation;
The handle of control cam rotation; And
Pull the hand behaviour mechanism that wheel, worm and gear cooperate transmission with off-centre.
3. pneumatic longstroke servo according to claim 1, it is characterized in that described main shaft through the load-bearing Bearing Installation on frame, the inner ring of load-bearing bearing is fixedly connected with main shaft, the outer ring of load-bearing bearing is fixedly connected with frame.
4. pneumatic longstroke servo according to claim 1 is characterized in that described frame comprises base, is fixed on the crossbeam that supporting frame and two ends on the base are fixedly connected with supporting frame respectively.
5. pneumatic longstroke servo according to claim 4 is characterized in that described base adopts the welding of 45# steel plate to form, and supporting frame and crossbeam adopt the channel-section steel section bar, base, crossbeam and supporting frame welding.
6. pneumatic longstroke servo according to claim 1 is characterized in that described cylinder piston rod is connected with U type fork-join head through screw thread, and U type fork-join head is fixedly connected with the driving swing arm through U type bolt axle.
7. according to each described pneumatic longstroke servo among the claim 1-6; It is characterized in that described control gear comprises control base plate, blocking-valve, solenoid valve, reduction valve, filter, break signal detector, intelligent positioner and feedback linkage, wherein:
The break signal detector is connected through circuit with solenoid valve;
Feedback linkage connects the feedback rod that drives swing arm and intelligent positioner;
The inlet end input compressed gas source of filter, the outlet side is connected with reduction valve;
The outlet of reduction valve is divided into two gas circuits, and first gas circuit is connected with the middle suction port of intelligent positioner through the pressure type selector valve, and second gas circuit is connected with the gas control hole of blocking-valve through solenoid valve;
The last lower production well of intelligent positioner, the last air holes through blocking-valve is connected with the cylinder up and down of cylinder respectively;
First gas circuit of pressure type selector valve reduction valve output under original state connects, and switching-over back first gas circuit is closed, and the cylinder up and down of cylinder is communicated with.
8. the controlling method of the said pneumatic longstroke servo of claim 7 is characterized in that:
The electric current of described break signal detector monitors solenoid valve when electric current during less than 4mA, breaks off the power supply of solenoid valve, and blocking-valve control gas breaks off, and inner air path breaks off, and is in the position state of protecting;
When electric power disconnection, the power supply of solenoid valve breaks off, and blocking-valve control gas breaks off, and inner air path breaks off, and is in the position state of protecting;
The output bleed pressure of monitoring reduction valve, when it was lower than setting value, blocking-valve breaking inner gas circuit was in the position state of protecting.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100675690A CN102562721A (en) | 2012-03-14 | 2012-03-14 | Pneumatic long-stroke actuating mechanism and control method thereof |
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| CN2012100675690A CN102562721A (en) | 2012-03-14 | 2012-03-14 | Pneumatic long-stroke actuating mechanism and control method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103962885A (en) * | 2014-05-06 | 2014-08-06 | 深圳市远洋翔瑞机械股份有限公司 | Machine tool safety door structure |
| CN105605289A (en) * | 2014-11-25 | 2016-05-25 | 国网河南省电力公司南阳供电公司 | Three-breaker protection circuit of industrial pneumatic control valve actuating mechanism |
| CN106051283A (en) * | 2016-08-01 | 2016-10-26 | 无锡市华通气动制造有限公司 | Box type actuator |
| CN108359788A (en) * | 2018-04-23 | 2018-08-03 | 黄石山力科技股份有限公司 | Pneumatic servo control system and tension stabilizing device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103962885A (en) * | 2014-05-06 | 2014-08-06 | 深圳市远洋翔瑞机械股份有限公司 | Machine tool safety door structure |
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| CN105605289A (en) * | 2014-11-25 | 2016-05-25 | 国网河南省电力公司南阳供电公司 | Three-breaker protection circuit of industrial pneumatic control valve actuating mechanism |
| CN106051283A (en) * | 2016-08-01 | 2016-10-26 | 无锡市华通气动制造有限公司 | Box type actuator |
| CN108359788A (en) * | 2018-04-23 | 2018-08-03 | 黄石山力科技股份有限公司 | Pneumatic servo control system and tension stabilizing device |
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Application publication date: 20120711 |