CN112879647B - Adjustable passive reset type electric actuating mechanism - Google Patents
Adjustable passive reset type electric actuating mechanism Download PDFInfo
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- CN112879647B CN112879647B CN202110305086.9A CN202110305086A CN112879647B CN 112879647 B CN112879647 B CN 112879647B CN 202110305086 A CN202110305086 A CN 202110305086A CN 112879647 B CN112879647 B CN 112879647B
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- 230000007246 mechanism Effects 0.000 title claims abstract description 93
- 230000005540 biological transmission Effects 0.000 claims abstract description 33
- 238000013016 damping Methods 0.000 claims description 31
- 230000007704 transition Effects 0.000 claims description 23
- 230000033001 locomotion Effects 0.000 claims description 16
- 238000007789 sealing Methods 0.000 claims description 14
- 238000003825 pressing Methods 0.000 claims description 12
- 230000000903 blocking effect Effects 0.000 claims description 9
- 229920002545 silicone oil Polymers 0.000 claims description 7
- 238000010862 gear shaping Methods 0.000 claims description 6
- 230000000712 assembly Effects 0.000 claims description 4
- 238000000429 assembly Methods 0.000 claims description 4
- 125000006850 spacer group Chemical group 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 description 15
- 230000008569 process Effects 0.000 description 15
- 230000009467 reduction Effects 0.000 description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000004308 accommodation Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 241000227287 Elliottia pyroliflora Species 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
- F16K31/047—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor characterised by mechanical means between the motor and the valve, e.g. lost motion means reducing backlash, clutches, brakes or return means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
- F16K31/05—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor specially adapted for operating hand-operated valves or for combined motor and hand operation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/53—Mechanical actuating means with toothed gearing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K47/00—Means in valves for absorbing fluid energy
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Retarders (AREA)
Abstract
An adjustable passive reset type electric actuator. The adjustable passive reset type electric actuator is simple in structure, convenient and reliable, and enables the valve to stably recover to a safe position in a fault, power failure or emergency state. The motor is connected with the primary NGW speed reducing mechanism through the transmission mechanism, the primary NGW speed reducing mechanism is connected with the secondary NGW speed reducing mechanism, the secondary NGW speed reducing mechanism is connected with the return spring box and the stroke control mechanism, and the primary NGW speed reducing mechanism is connected with the damper through the brake. The invention adopts the motor driving transmission mechanism and the two-stage NGW speed reducing mechanism, and can ensure that the output of a larger transmission ratio is realized under a smaller volume, thereby realizing the functions of compact volume and stable resetting of the spring resetting electric actuating mechanism for the nuclear power station.
Description
Technical Field
The invention relates to an electric actuator, in particular to an adjustable passive reset type electric actuator.
Background
An electric actuator is a driving device that provides linear or rotational motion, which uses some driving energy and operates under some control signal. The actuator uses a liquid, gas, electric or other energy source and converts it into a driving action by means of an electric motor, cylinder or other device. The basic types include a partial rotation (Part-Turn), a Multi-rotation (Multi-Turn) and a Linear motion (Linear).
In recent years, safety requirements in the process of automation control of nuclear power plant processes have increased. The system must be safe to humans and the environment even during emergency operation. It is therefore required that the electric actuator must open or close the valve in time during emergency operation to ensure that the plant is in a safe state.
Currently, in the use process of a valve, a certain safety risk exists due to the fact that an electric actuating mechanism is in a fault, power failure or emergency state.
Disclosure of Invention
Aiming at the problems, the invention provides the adjustable passive reset type electric actuator which has a simple structure, is convenient and reliable, and can enable the valve to stably recover to a safe position in the fault, power failure or emergency state.
The technical scheme of the invention is as follows: comprises a shell, a return spring box arranged outside the shell, a motor, a transmission mechanism, a primary NGW speed reducing mechanism, a secondary NGW speed reducing mechanism, a brake, a damper and a stroke control mechanism which are arranged in the shell,
The motor is connected with a primary NGW speed reducing mechanism through a transmission mechanism, the primary NGW speed reducing mechanism is connected with a secondary NGW speed reducing mechanism, the secondary NGW speed reducing mechanism is connected with a reset spring box and a stroke control mechanism,
The primary NGW speed reducing mechanism is connected with the damper through a brake.
The transmission mechanism comprises a primary worm wheel, a secondary worm and a secondary worm wheel, the rotating shaft of the motor is meshed with the primary worm wheel, the primary worm wheel is fixed on the secondary worm, and the secondary worm is meshed with the secondary worm wheel.
The primary NGW speed reducing mechanism comprises a primary planet wheel, a primary sun wheel, a primary planet carrier and a primary internal gear,
The first-stage sun gear is fixed on the second-stage worm gear, the first-stage planet gears are respectively meshed with the first-stage sun gear and the first-stage inner gear, and the first-stage planet gears are fixed on the first-stage planet carrier.
The second-stage NGW speed reducing mechanism comprises a second-stage planet wheel, a second-stage sun wheel and a second-stage planet carrier,
The secondary sun gear is fixed on the primary planet carrier, the secondary sun gear is meshed with the secondary planet gear, and the secondary planet gear is fixed on the secondary planet carrier;
The secondary planet carrier is connected with the reset spring box.
The manual switching mechanism comprises a plug pin with gear shaping, a jack is arranged on the shell, the plug pin is movably connected in the jack, and the gear shaping is used for inserting external teeth of the primary internal gear;
The internal teeth of the secondary internal gear are meshed with the external teeth of the secondary planetary gear, the shell is provided with a placement slotted hole,
The manual worm is positioned in the positioning slot hole and meshed with the secondary internal gear.
One end of the brake is provided with a brake gear, the other end is provided with a speed increasing gear I,
The brake gear is meshed with the external teeth of the primary internal gear;
the damper is provided with a second speed increasing gear, and the first speed increasing gear is meshed with the second speed increasing gear.
The damper comprises a base, a rotator, a lower gasket, a damping shell, an upper gasket, an adjusting nut, a spring and a rotating shaft;
The base is in a convex shape, the middle part of the base is provided with a stepped hole with a big upper part and a small lower part, the lower gasket is provided with a middle hole, the lower gasket is horizontally arranged in a big stepped hole of the stepped hole,
The rotating shaft is provided with a supporting ring, the supporting ring of the rotating shaft is arranged on the lower gasket, the lower part of the rotating shaft penetrates through the middle hole of the lower gasket and extends out of the stepped hole, and the rotating shaft is connected with the speed increasing gear II;
The top and bottom of the rotating body are respectively provided with a first accommodating hole and a second accommodating hole, a connecting cylinder with a perforation is arranged in the middle of the first accommodating hole, the perforation is communicated with the second accommodating hole, the upper part of the base is positioned in the second accommodating hole, the upper part of the rotating shaft is positioned in the second accommodating hole and the perforation, and the rotating shaft is connected with the rotating body through a flat key;
the connecting cylinder is provided with external threads, the adjusting screw cap is connected with the connecting cylinder through threads, the top of the adjusting screw cap is closed, and the spring is positioned between the adjusting screw cap and the rotating shaft;
The damping shell is provided with a mounting hole, the rotator is positioned in the mounting hole, the top of the mounting hole is provided with a baffle ring, and the upper gasket is positioned between the baffle ring and the adjusting nut;
The bottom of the damping shell is provided with a flange end which is connected with the lower part of the base;
Damping silicone oil is arranged in the damping shell.
The sealing gasket is used for being connected to the upper portion of the baffle ring of the placement hole, and the gasket and the sealing gasket are located between the sealing gasket and the baffle ring.
The rotator is in clearance fit with the damping shell, and the rotator is in clearance fit with the base.
The top of the adjusting nut is provided with a small hole.
The travel control mechanism comprises a pressing plate, a gear transmission assembly, a switch bottom plate, at least one group of control assemblies, an on-direction travel switch and an off-direction travel switch;
the switch bottom plate is arranged above the pressing plate in parallel through a supporting shaft,
The gear transmission assembly is arranged between the switch bottom plate and the pressing plate and comprises a first transition gear and a second transition gear which are meshed, wherein the first transition gear is internally used for connecting a travel shaft, and the travel shaft penetrates through the primary planet carrier and is connected with the secondary planet carrier;
the second transition gear is internally connected with a rotating shaft, and the rotating shaft extends upwards out of the switch bottom plate;
The control assembly is arranged above the switch bottom plate and comprises a cam sheet, a pad sleeve and a shifting fork component, wherein the cam sheet, the pad sleeve and the shifting fork component are sequentially arranged on the rotating shaft in a penetrating manner from bottom to bottom, the shifting fork component is used for driving the cam sheet, and the cam sheet is used for contacting with an on-direction travel switch or an off-direction travel switch;
the on-direction travel switch and the off-direction travel switch are respectively arranged on the switch bottom plate.
The shifting fork component comprises a supporting plate shaft sleeve, a supporting plate, a round head shaft, a disc spring, a shifting fork and a blocking gasket, wherein the supporting plate shaft sleeve is connected to the rotating shaft through a locking screw,
An annular groove is arranged at the bottom of the supporting plate shaft sleeve,
One end of the support plate is provided with a connecting hole, the other end of the support plate is provided with a mounting hole, the mounting hole of the support plate is sleeved on the annular groove, the body of the round head shaft stretches into the connecting hole, the bottom of the round head shaft is provided with an annular blocking groove, and the blocking gasket is positioned in the annular blocking groove;
The shifting fork comprises a ring body and an inverted L-shaped push rod arranged at one side of the ring body, the body of the round head shaft stretches into the ring body, and the disc spring is sleeved on the body of the round head shaft and positioned between the support plate and the ring body;
The cam sheet is provided with a shifting fork hole, and the push rod is positioned in the shifting fork hole.
Wherein the pad sleeve in the uppermost group of control components is a supporting body which is in a runway shape and is provided with a pair of perforations,
The stroke shaft extends upwards out of the switch bottom plate, and the stroke shaft and the rotating shaft extend into a pair of through holes respectively.
The planetary gear set further comprises a limit screw, wherein the limit screw is fixed on the shell and used for limiting the movement of the secondary planet carrier.
The brake is a tooth-shaped brake.
The invention adopts the motor to drive the transmission mechanism and the two-stage NGW speed reducing mechanism, and the transmission form can ensure that the output of a larger transmission ratio is realized under a smaller volume, thereby realizing the functions of compact volume and stable resetting of the spring reset electric actuating mechanism for the nuclear power station.
Drawings
Figure 1 is a schematic perspective view of the present invention,
Figure 2 is a schematic perspective view of a second embodiment of the present invention,
Figure 3 is a schematic diagram of the internal structure of the present invention-one,
Figure 4 is a schematic diagram of the internal structure of the present invention,
Figure 5 is a schematic view of the structure of the damper,
Figure 6 is a schematic view of the structure of the spindle,
Figure 7 is a schematic view of the connection structure of the swivel and the adjustment nut,
Figure 8 is a schematic view of the construction of the travel control mechanism,
Figure 9 is a schematic diagram of a stroke control mechanism II,
FIG. 10 is a schematic structural view of a fork assembly;
In the figure, 1 is a motor, 2 is a primary worm wheel, 3 is a secondary worm, 4 is a secondary worm wheel, 5 is a primary planet wheel, 6 is a primary sun wheel, 7 is a primary planet carrier, 8 is a secondary planet wheel, 9 is a secondary sun wheel, 10 is a secondary planet carrier, 11 is a manual worm,
12 Is a manual switching mechanism, 120 is a latch,
Reference numeral 13 denotes a stroke control mechanism,
131 Is a pressing plate, 132 is a first transition gear, 133 is a second transition gear, 134 is a switch bottom plate, 135 is a cam plate, 1350 is a shifting fork hole, 136 is a cushion sleeve, 137 is a locking screw, 138 is a shifting fork component, 139 is a supporting body, 1310 is a rotating shaft, 1311 is a closing travel switch, 1312 is an opening travel switch, 1313 is a support plate shaft sleeve, 13130 is an annular groove, 1314 is a support plate, 1315 is a round head shaft, 1316 is a disc spring, 1317 is a shifting fork, 13170 is a push rod, 1318 is a blocking spacer, and 1319 is a supporting shaft;
14 is a primary internal gear, 15 is a secondary internal gear, 16 is a return spring box, 17 is a limit screw, 18 is a brake gear, 19 is a brake,
201 Is a first step-up gear, 202 is a second step-up gear,
Reference numeral 21 is a damper which is provided with a damper,
211 Is a base, 212 is a copper sleeve, 213 is a swivel, 2131 is a first accommodation hole, 2132 is a second accommodation hole, 2133 is a connecting cylinder, 214 is a lower gasket, 215 is a damping shell, 216 is an upper gasket, 217 is a sealing gasket, 218 is a sealing plug, 219 is a gasket, 2110 is an adjusting nut, 21101 is a small hole, 2111 is a spring, 2112 is a rotating shaft, 21120 is a supporting ring, 2113 is a baffle ring, 2114 is a flange end, 2115 is a sealing ring, and 2116 is a stepped hole;
Reference numeral 22 denotes a stroke shaft, and 23 denotes a housing.
Detailed Description
The invention is shown in figures 1-10, and comprises a shell 23, a return spring box 16 arranged outside the shell, a motor 1, a transmission mechanism, a primary NGW speed reducing mechanism, a secondary NGW speed reducing mechanism, a brake, a damper and a stroke control mechanism which are arranged in the shell,
The motor is connected with a primary NGW speed reducing mechanism through a transmission mechanism, the primary NGW speed reducing mechanism is connected with a secondary NGW speed reducing mechanism, the secondary NGW speed reducing mechanism is connected with a reset spring box and a stroke control mechanism,
The primary NGW deceleration mechanism is connected to a damper 21 through a brake 19.
The invention adopts the motor to drive the transmission mechanism and the two-stage NGW speed reducing mechanism, and the transmission form can ensure that the output of a larger transmission ratio is realized under a smaller volume, thereby realizing the functions of compact volume and stable resetting of the spring reset electric actuating mechanism for the nuclear power station.
The transmission mechanism comprises a primary worm wheel 2, a secondary worm 3 and a secondary worm wheel 4, wherein the rotating shaft of the motor is meshed with the primary worm wheel, the primary worm wheel 2 is fixed on the secondary worm 3, and the secondary worm is meshed with the secondary worm wheel.
The motor rotating shaft adopts a worm direct output mode, so that the transmission precision is ensured, the whole volume is reduced, and the transmission efficiency is improved.
The secondary worm wheel and the secondary worm adopt a self-locking worm with high transmission efficiency, realize self-locking while guaranteeing the transmission efficiency, and realize stable and reliable operation process in the spring resetting process.
The primary NGW speed reducing mechanism comprises a primary planet wheel 5, a primary sun wheel 6, a primary planet carrier 7 and a primary internal gear 14,
The first-stage sun gear is fixed on the second-stage worm gear, the first-stage planet gears are respectively meshed with the first-stage sun gear and the first-stage inner gear, and the first-stage planet gears are fixed on the first-stage planet carrier.
The second-stage NGW speed reducing mechanism comprises a second-stage planet wheel, a second-stage sun wheel and a second-stage planet carrier,
The secondary sun gear 9 is fixed on the primary planet carrier 7, the secondary sun gear 9 is meshed with the secondary planet gears 8, and the secondary planet gears 8 are fixed on the secondary planet carrier 10;
The secondary planet carrier is connected with the reset spring box.
The second-stage planet carrier is connected with the reset spring box in a spline mode, and fine adjustment of output torque of the reset spring box is achieved through change of spline engagement angles, so that manufacturing difficulty of the reset spring is reduced.
The primary planetary gear, the primary sun gear, the primary planet carrier and the primary internal gear form a primary NGW speed reducing mechanism, the secondary planetary gear, the secondary sun gear, the secondary planet carrier and the secondary internal gear form a secondary NGW speed reducing mechanism, and the two-stage NGW speed reducing mechanism realizes high torque output while ensuring transmission efficiency.
The manual switching mechanism comprises a plug pin 120 with gear shaping, a jack is arranged on the shell, the plug pin is movably connected in the jack, and the gear shaping is used for inserting external teeth of the primary internal gear 14;
The inner teeth of the secondary internal gear 15 are meshed with the outer teeth of the secondary planet gears 8, the shell is provided with a placement slotted hole,
The manual worm is positioned in the positioning slot hole and meshed with the secondary internal gear.
The manual worm 11 has the self-locking characteristic, so that the motor motion can be stably transmitted to the valve in an electric state, and meanwhile, the manual worm is matched with the manual switching mechanism, so that manual operation in a fault and power failure state can be realized.
One end of the brake 19 is provided with a brake gear 18, the other end is provided with a speed increasing gear 201,
The brake gear 18 is meshed with the external teeth of the primary internal gear 14;
The damper is provided with a second speed increasing gear 202, and the first speed increasing gear is meshed with the second speed increasing gear.
The damper 21 includes a base 211, a swivel 213, a lower spacer 214, a damping housing 215, an upper spacer 216, an adjustment nut 2110, a spring 2111 and a rotary shaft 2112;
the base 211 is in a convex shape, the middle part of the base is provided with a stepped hole 2116 with a big upper part and a small lower part, the lower gasket is provided with a middle hole, the lower gasket is horizontally arranged in a big stepped hole of the stepped hole,
The rotating shaft 2112 is provided with a supporting ring 21120, the supporting ring of the rotating shaft 2112 is arranged on the lower gasket, the lower part of the rotating shaft passes through the middle hole of the lower gasket and extends out of the stepped hole, and the rotating shaft 2112 is connected with a second speed increasing gear;
a first accommodating hole 2131 and a second accommodating hole 2132 are respectively arranged in the middle of the top and the bottom of the swivel 213, a connecting cylinder 2133 with a perforation is arranged in the middle of the first accommodating hole, the perforation is communicated with the second accommodating hole, the upper part of the bottom 211 seat is positioned in the second accommodating hole, the upper part of the rotating shaft 2112 is positioned in the second accommodating hole and the perforation, and the rotating shaft is connected with the swivel through a flat key;
The connecting cylinder 2133 is provided with external threads, the adjusting nut 2110 is connected with the connecting cylinder through threads, the top of the adjusting nut is closed, and the spring 2111 is positioned between the adjusting nut and the rotating shaft;
the damping shell 215 is provided with a mounting hole, the rotator is positioned in the mounting hole, a baffle ring 2113 is arranged at the top of the mounting hole, and the upper gasket is positioned between the baffle ring and the adjusting nut;
The bottom of the damping shell is provided with a flange end 2114 which is connected with the lower part of the base;
Damping silicone oil is arranged in the damping shell.
The damper adopts a liquid friction type rotary damper, and has the characteristics of small volume, stable operation and vanishing damping moment after the movement is stopped. The damper can greatly weaken the impact between the valve core and the valve seat of the valve when resetting, and after reaching the safe position of the valve, the spring force can be completely transferred to the valve without internal consumption, thereby improving the efficiency.
In operation, the rotating body is driven to move through the rotating shaft by arranging the rotating body between the base and the damping shell, and the adjusting nut is connected to the connecting cylinder of the rotating body through threads, so that the whole body is formed conveniently; a spring is arranged between the rotating shaft and the adjusting nut, so that the adjusting nut is contacted with the upper gasket;
When the damping moment is realized, because damping silicone oil is arranged in the damping shell, the rotating shaft drives the rotating body to move together in the rotating process of the rotating shaft, and friction force is generated between the rotating body and the damping shell and the base due to the existence of the silicone oil in the moving process;
when the damping moment is adjusted, when the damping moment is insufficient in the running process of the damper, the adjusting nut can be adjusted, and the relative rotation between the adjusting nut and the rotating body is adjusted, so that the contact area between the rotating body and the base and the shell is increased, the friction force is increased, and finally the damping moment is increased.
Also included are a gasket 217 for attachment to the upper portion of the retainer ring of the mounting hole, a sealing plug 218, and a gasket 219 located between the sealing plug and the retainer ring.
The sealing gasket, the sealing plug and the gasket are arranged, so that the top of the damping shell is convenient to seal, and the operation is reliable.
The rotator is in clearance fit with the damping shell, and the rotator is in clearance fit with the base.
Through clearance fit, be convenient for place damping silicone oil action.
Also included is a seal ring 2115 located between the housing flange end and the base.
And a sealing ring is arranged, so that the tightness between the shell and the base is improved.
And further comprises a copper sleeve 212, wherein the copper sleeve is arranged in the small step hole of the step hole, and the rotating shaft is positioned in the copper sleeve.
The copper bush is arranged, so that the strength is ensured, and the wear resistance is improved.
The top of the adjustment nut 2110 is provided with a small hole 21101.
Small holes are arranged and can be used as damping silicone oil supplementing holes.
The travel control mechanism 13 comprises a pressing plate 131, a gear transmission assembly, a switch bottom plate 134, at least one group of control assemblies, an on-direction travel switch 1312 and an off-direction travel switch 1311;
the switch base plate 131 is disposed in parallel above the pressing plate through a support shaft 1319,
The gear transmission assembly is arranged between the switch bottom plate and the pressing plate and comprises a first transition gear 132 and a second transition gear 133 which are meshed, the first transition gear 132 is internally used for being connected with a travel shaft 22, and the travel shaft 22 passes through the primary planet carrier and is connected with the secondary planet carrier;
The second transition gear 133 is connected to a rotating shaft 1310, and the rotating shaft extends upwards to extend out of the switch bottom plate;
The control assembly is arranged above the switch bottom plate and comprises a cam plate 135, a pad sleeve 136 and a shifting fork component 138, wherein the cam plate, the pad sleeve and the shifting fork component are sequentially arranged on a rotating shaft 1310 in a penetrating manner from bottom to bottom, the shifting fork component is used for driving the cam plate, and the cam plate is used for contacting with an on-direction travel switch or an off-direction travel switch;
The on-way travel switch 1312 and the off-way travel switch 1311 are respectively provided on the switch base plate.
In operation, the first transition gear and the second transition gear which are meshed are arranged between the pressing plate and the switch bottom plate, and when a stroke shaft in the first transition gear acts, a rotating shaft in the second transition gear is driven to act; because the control component is arranged on the rotating shaft, the control component contacts with the on-direction travel switch or the off-direction travel switch to realize the switch action, thereby controlling the start and stop control of the electric actuating mechanism.
The at least one group of control components can increase or decrease the number of the switches according to the user demand, and the number of the cam sheets, the cushion sleeve, the shifting fork component, the locking screw and the switches only need to be changed in the increasing or decreasing process.
The fork member 138 includes a bracket bushing 1313, a bracket 1314, a round head shaft 1315, a disc spring 136, a fork 1317, and a blocking washer 1318, which is coupled to a rotating shaft by a locking screw 137,
The bottom of the fulcrum sleeve is provided with an annular groove 13130,
One end of the support plate 1314 is provided with a connecting hole, the other end of the support plate 1314 is provided with a mounting hole, the mounting hole of the support plate is sleeved on the annular groove, the body of the round head shaft stretches into the connecting hole, the bottom of the round head shaft is provided with an annular baffle groove, and the baffle gasket is positioned in the annular baffle groove;
The shifting fork 1317 comprises a ring body and an inverted L-shaped push rod 13170 arranged at one side of the ring body, the body of the round head shaft stretches into the ring body, and the disc spring is sleeved on the body of the round head shaft and is positioned between the support plate and the ring body;
The cam plate 135 is provided with a shift fork hole 1350, and the push rod is positioned in the shift fork hole.
When the cam plate pressing device is applied, the support plate shaft sleeve 13 in the shifting fork component 8 is fixedly connected with the support plate 14, the round head shaft 15 is in clearance fit with the support plate 14, a disc spring is arranged between the shifting fork and the support plate, a certain pretightening force is kept, the pretightening force can ensure that the round head shaft 15 does not rotate in the process that the cam plate 5 presses a switch, and the round head shaft can rotate manually.
The pad in the uppermost set of control elements is a support 139 which is in the form of a racetrack having a pair of perforations,
The travel shaft 22 extends upwardly from the switch base plate, and the travel shaft 22 and the rotation shaft 1310 extend into a pair of bores, respectively.
In application, the first transition gear is fixedly connected with the stroke shaft through a fastening screw; the support body is sleeved on the stroke shaft in an empty mode, and the vibration resistance of the stroke control mechanism is only increased, so that motion is not transmitted.
In the motion process, a stroke shaft of the electric actuating mechanism transmits the motion process to a first transition gear, the first transition gear transmits the operation process to a second transition gear through meshing, the second transition gear transmits the motion to a shifting fork component through a rotating shaft, and a shifting fork in the shifting fork component transmits the motion to a cam plate, so that a switch (namely an on-direction travel switch and an off-direction travel switch) is pressed through the cam plate.
The adjusting process is divided into a coarse adjusting part and a fine adjusting part, the coarse adjusting part changes the position of the shifting fork part by adjusting the installation position of the shifting fork part 8 on the rotating shaft, and then the position of the cam sheet pressure switch is changed. And after coarse adjustment is in place, locking the locking screw, thereby fixing the shifting fork component. If the coarse adjustment can not meet the requirements of the site on the stroke control precision, the fine adjustment of the stroke switch can be realized through fine adjustment. During fine adjustment, the angle of the shifting fork is adjusted by rotating the round head shaft, so that fine adjustment of the angle of the cam sheet is driven, and fine adjustment of the position of the cam sheet pressing switch is realized.
And a limit screw 17 fixed on the shell for limiting the movement of the secondary planet carrier.
Limiting the travel of the actuating mechanism does not exceed the limit travel of the valve, and the safe operation of the valve is ensured.
The brake 19 is a tooth brake.
The low-energy-consumption tooth-shaped brake is adopted, and has the characteristics of large braking torque, long service life, small volume and stable performance, and can meet the severe environmental working condition of a nuclear power system.
In the application of the invention, the rotating shaft of the motor is meshed with a primary worm wheel 2, the primary worm wheel 2 is fixed on a secondary worm 3, the secondary worm 3 is meshed with a secondary worm wheel 4, a primary sun wheel 6 is fixed on the secondary worm wheel 4, the primary sun wheel 6 is meshed with a primary planet wheel 5, the primary planet wheel 5 is fixed on a primary planet carrier 7, the primary planet wheel 5 is respectively meshed with the primary sun wheel 6 and a primary internal gear 14,
The inner teeth of the primary internal gear 14 are meshed with the primary planet gears 5, the outer teeth are respectively meshed with the manual switching mechanism 12 and the brake gear 18,
The secondary sun gear 9 is fixed on the primary planet carrier 7, the secondary sun gear 9 is meshed with the secondary planet gears 8, the secondary planet gears 8 are fixed on the secondary planet carrier 10, the secondary planet gears 8 are respectively meshed with the secondary sun gear 9 and the secondary inner gear 15,
The internal teeth of the secondary internal gear 15 are meshed with the secondary planet gears, the external teeth are meshed with the manual worm 11, the secondary planet carrier 10 is connected with the return spring box 16, and the limit screw 17 is fixed on the shell and used for limiting the movement of the secondary planet carrier 10.
The brake gear 18 is arranged on the brake 19, and the other end of the brake gear 18 is provided with a first speed increasing gear 20 which is meshed with a second speed increasing gear on the damper.
The stroke control mechanism 13 is directly connected to the secondary planet carrier 10 (i.e., the stroke shaft 22 is connected to the secondary planet carrier), and the secondary planet carrier serves as a direct output member, so that the position of the electric actuator can be accurately fed back. The rotation of the secondary planet carrier 10 drives the cam sheet in the stroke control mechanism to rotate, presses the switch, cuts off the power supply of the motor, and realizes the stop action of the electric actuating mechanism.
When in electric operation: the speed reduction transmission structure of the worm gear and the two-stage NGW planetary gear is adopted, one-stage speed reduction is formed by a motor and a one-stage worm gear, two-stage speed reduction is formed by a two-stage worm and a two-stage worm gear, three-stage speed reduction is formed by a one-stage sun gear, a one-stage planetary carrier and a one-stage internal gear, and four-stage speed reduction is formed by a two-stage sun gear, a two-stage planetary carrier and a two-stage internal gear. In the transmission route, the external teeth of the primary internal gear of the primary NGW speed reducing mechanism are fixed through a brake, so that the motion transmitted from the secondary worm wheel to the primary sun gear is ensured to be output through the primary planet carrier. The external teeth of the secondary internal gear of the secondary NGW speed reducing mechanism are fixed through self-locking of a manual worm, so that the motion of the primary planet carrier transmitted to the secondary sun gear is ensured, the secondary planet carrier can be used for outputting, and finally, the energy storage of the reset spring box and the opening and closing of the valve are realized.
When in manual operation: the gear worm and NGW speed reduction transmission mechanism is adopted, when in a manual operation state, the manual operation mechanism is switched to a manual state, at the moment, a primary internal gear of the primary NGW speed reduction mechanism is in a locking state, and a secondary worm wheel and a secondary worm have self-locking characteristics, so that a primary sun gear is in a locking state, and a primary NGW planet is in a locking state.
Upon failure or power-down reset: the two-stage NGW speed increasing and two-stage spur gear speed increasing transmission mechanism is adopted, under the power failure or fault state, the brake is in the power failure state, no torque is generated by the brake at the moment, the manual switching mechanism is in the electric state, the torque generated by the reset spring box is transmitted to the second-stage planet carrier, the second-stage planet carrier is transmitted to the first-stage planet carrier through the second-stage planet wheel and the second-stage sun wheel, and the first-stage sun wheel and the second-stage worm are in a self-locking characteristic, so that the first-stage planet carrier transmits motion to the first-stage planet wheel, then the first-stage planet wheel transmits to the first-stage inner gear, the external teeth of the first-stage inner gear transmit to the brake, and then the first-stage inner gear and the second-stage sun wheel transmit to the damper, so that spring reset is realized.
In a fault or power-off reset state, a four-stage speed-increasing transmission mechanism is adopted, so that the damper can run stably with smaller torque in the reset process of the executing mechanism.
For the purposes of this disclosure, the following points are also described:
(1) The drawings of the embodiments disclosed in the present application relate only to the structures related to the embodiments disclosed in the present application, and other structures can refer to common designs;
(2) The embodiments disclosed herein and features of the embodiments may be combined with each other to arrive at new embodiments without conflict;
the above is only a specific embodiment disclosed in the present application, but the protection scope of the present disclosure is not limited thereto, and the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (7)
1. An adjustable passive reset type electric actuating mechanism comprises a shell and is characterized by also comprising a reset spring box arranged outside the shell, a motor, a transmission mechanism, a primary NGW speed reducing mechanism, a secondary NGW speed reducing mechanism, a brake, a damper and a stroke control mechanism which are arranged in the shell,
The motor is connected with a primary NGW speed reducing mechanism through a transmission mechanism, the primary NGW speed reducing mechanism is connected with a secondary NGW speed reducing mechanism, the secondary NGW speed reducing mechanism is connected with a reset spring box and a stroke control mechanism,
The primary NGW speed reducing mechanism is connected with a damper through a brake;
The transmission mechanism comprises a primary worm wheel, a secondary worm and a secondary worm wheel, the rotating shaft of the motor is meshed with the primary worm wheel, the primary worm wheel is fixed on the secondary worm, and the secondary worm is meshed with the secondary worm wheel;
the primary NGW speed reducing mechanism comprises a primary planet wheel, a primary sun wheel, a primary planet carrier and a primary internal gear,
The first-stage sun gear is fixed on the second-stage worm gear, the first-stage planetary gear is meshed with the first-stage sun gear and the first-stage internal gear respectively, and the first-stage planetary gear is fixed on the first-stage planetary carrier;
The second-stage NGW speed reducing mechanism comprises a second-stage planet wheel, a second-stage sun wheel and a second-stage planet carrier,
The secondary sun gear is fixed on the primary planet carrier, the secondary sun gear is meshed with the secondary planet gear, and the secondary planet gear is fixed on the secondary planet carrier;
the secondary planet carrier is connected with the reset spring box;
the manual switching mechanism comprises a plug pin with gear shaping, a jack is arranged on the shell, the plug pin is movably connected in the jack, and the gear shaping is used for inserting external teeth of the primary internal gear;
The internal teeth of the secondary internal gear are meshed with the external teeth of the secondary planetary gear, the shell is provided with a placement slotted hole,
The manual worm is positioned in the positioning slot hole and meshed with the secondary internal gear;
One end of the brake is provided with a brake gear, the other end is provided with a speed increasing gear I,
The brake gear is meshed with the external teeth of the primary internal gear;
The damper is provided with a second speed increasing gear, and the first speed increasing gear is meshed with the second speed increasing gear;
the damper comprises a base, a rotator, a lower gasket, a damping shell, an upper gasket, an adjusting nut, a spring and a rotating shaft;
The base is in a convex shape, the middle part of the base is provided with a stepped hole with a big upper part and a small lower part, the lower gasket is provided with a middle hole, the lower gasket is horizontally arranged in a big stepped hole of the stepped hole,
The rotating shaft is provided with a supporting ring, the supporting ring of the rotating shaft is arranged on the lower gasket, the lower part of the rotating shaft penetrates through the middle hole of the lower gasket and extends out of the stepped hole, and the rotating shaft is connected with the speed increasing gear II;
The top and bottom of the rotating body are respectively provided with a first accommodating hole and a second accommodating hole, a connecting cylinder with a perforation is arranged in the middle of the first accommodating hole, the perforation is communicated with the second accommodating hole, the upper part of the base is positioned in the second accommodating hole, the upper part of the rotating shaft is positioned in the second accommodating hole and the perforation, and the rotating shaft is connected with the rotating body through a flat key;
the connecting cylinder is provided with external threads, the adjusting screw cap is connected with the connecting cylinder through threads, the top of the adjusting screw cap is closed, and the spring is positioned between the adjusting screw cap and the rotating shaft;
The damping shell is provided with a mounting hole, the rotator is positioned in the mounting hole, the top of the mounting hole is provided with a baffle ring, and the upper gasket is positioned between the baffle ring and the adjusting nut;
The bottom of the damping shell is provided with a flange end which is connected with the lower part of the base;
Damping silicone oil is arranged in the damping shell;
the rotator is in clearance fit with the damping shell, and the rotator is in clearance fit with the base;
the top of the adjusting nut is provided with a small hole.
2. The adjustable passive reset type electric actuator of claim 1 further comprising a gasket, a sealing plug and a gasket, wherein the sealing plug is used for being connected to the upper portion of the retainer ring of the mounting hole, and the gasket are located between the sealing plug and the retainer ring.
3. An adjustable passive reset electric actuator as claimed in claim 1 or 2 wherein said travel control mechanism comprises a pressure plate, a gear drive assembly, a switch base plate, at least one set of control assemblies, an on-travel switch and an off-travel switch;
the switch bottom plate is arranged above the pressing plate in parallel through a supporting shaft,
The gear transmission assembly is arranged between the switch bottom plate and the pressing plate and comprises a first transition gear and a second transition gear which are meshed, wherein the first transition gear is internally used for connecting a travel shaft, and the travel shaft penetrates through the primary planet carrier and is connected with the secondary planet carrier;
the second transition gear is internally connected with a rotating shaft, and the rotating shaft extends upwards out of the switch bottom plate;
The control assembly is arranged above the switch bottom plate and comprises a cam sheet, a pad sleeve and a shifting fork component, wherein the cam sheet, the pad sleeve and the shifting fork component are sequentially arranged on the rotating shaft in a penetrating manner from bottom to bottom, the shifting fork component is used for driving the cam sheet, and the cam sheet is used for contacting with an on-direction travel switch or an off-direction travel switch;
the on-direction travel switch and the off-direction travel switch are respectively arranged on the switch bottom plate.
4. An adjustable passive reset electric actuator according to claim 3 wherein said fork member comprises a bracket sleeve, a bracket, a round head shaft, a disc spring, a fork and a spacer, said bracket sleeve being attached to a rotating shaft by a locking screw,
An annular groove is arranged at the bottom of the supporting plate shaft sleeve,
One end of the support plate is provided with a connecting hole, the other end of the support plate is provided with a mounting hole, the mounting hole of the support plate is sleeved on the annular groove, the body of the round head shaft stretches into the connecting hole, the bottom of the round head shaft is provided with an annular blocking groove, and the blocking gasket is positioned in the annular blocking groove;
The shifting fork comprises a ring body and an inverted L-shaped push rod arranged at one side of the ring body, the body of the round head shaft stretches into the ring body, and the disc spring is sleeved on the body of the round head shaft and positioned between the support plate and the ring body;
The cam sheet is provided with a shifting fork hole, and the push rod is positioned in the shifting fork hole.
5. An adjustable passive reset electric actuator as set forth in claim 3 wherein the pad in the uppermost set of control assemblies is a support body having a racetrack shape with a pair of perforations,
The stroke shaft extends upwards out of the switch bottom plate, and the stroke shaft and the rotating shaft extend into a pair of through holes respectively.
6. The adjustable passive return electric actuator of claim 4 further comprising a stop screw disposed on the housing for limiting movement of the secondary planet carrier.
7. An adjustable passive return electric actuator according to claim 1 wherein said brake is a tooth brake.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110305086.9A CN112879647B (en) | 2021-03-18 | 2021-03-18 | Adjustable passive reset type electric actuating mechanism |
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| CN202110305086.9A CN112879647B (en) | 2021-03-18 | 2021-03-18 | Adjustable passive reset type electric actuating mechanism |
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| CN112879647B true CN112879647B (en) | 2024-05-10 |
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| CN112879647A (en) | 2021-06-01 |
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