CN112555493A - Corner resetting electro-hydraulic actuator and control method thereof, and closed-loop hydraulic circuit - Google Patents
Corner resetting electro-hydraulic actuator and control method thereof, and closed-loop hydraulic circuit Download PDFInfo
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- CN112555493A CN112555493A CN202011429987.0A CN202011429987A CN112555493A CN 112555493 A CN112555493 A CN 112555493A CN 202011429987 A CN202011429987 A CN 202011429987A CN 112555493 A CN112555493 A CN 112555493A
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- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
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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
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
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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
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Abstract
The invention provides a corner resetting electro-hydraulic actuator, a control method thereof and a closed-loop hydraulic circuit, wherein the corner resetting electro-hydraulic actuator comprises the following steps: the pneumatic cylinder, the converter, canceling release mechanical system, further, the converter includes: the support, first conversion spare, the shaft coupling is equipped with the round pin axle on wherein the shaft coupling, and first conversion spare includes: the guide shaft sleeve is connected with the guide shaft hole of the support, at least part of the guide shaft sleeve body is inserted into the guide shaft pipe to move the coupler through the transmission end of the hydraulic cylinder, the linkage steering part drives the guide shaft sleeve to rotate on the first aspect, the reset mechanism is compressed on the second aspect, and therefore the transmission precision ratio and the stability are improved, and the reset function is achieved.
Description
Technical Field
The invention relates to the technology of an electro-hydraulic converter, in particular to an electro-hydraulic actuator with a reset function and used for converting linear motion into angular motion, a control method thereof and a closed-loop hydraulic circuit.
Background
The conventional electro-hydraulic actuator is usually used for regulating and controlling various valves, namely converting the linear motion of a hydraulic oil cylinder into angular motion, to rotate the valve for adjustment, as shown in chinese patent No. 201420245149.1, the electro-hydraulic butterfly valve actuator comprises a box body, a left box cover, a right box cover and an actuator body, wherein the box body, the left box cover and the right box cover are fixed through bolts, and forms a cavity therein, the actuator body includes a rack plunger disposed within the cavity, a gear meshed with the rack plunger, an execution shaft is inserted in the gear, the lower end of the execution shaft is connected with a butterfly valve, the two ends of the cavity are respectively connected with an oil inlet pipe and an oil outlet pipe, the end parts of the oil inlet pipe and the oil outlet pipe are provided with quick connectors, and a position of the right box cover opposite to the rack plunger is provided with a limit screw for positioning the rack plunger.
However, the prior art has the defects that the gear rack is adopted as the intermediate conversion mechanism, so that the transmission precision is low, the stability is not high, the overshoot oscillation phenomenon is easy to occur in the system, and the reset function is not available.
In the field of traditional large-torque actuators, in order to realize the reset function when power failure or other faults occur, a traditional spiral spring structure is generally adopted, therefore, the size has great limitation, for example, Chinese patent No. 201420245149.1, provides an intelligent variable frequency hydraulic electric actuator with 60 mm straight travel power-off reset, the valve actuator comprises an outer cylinder, a bracket and a controller, wherein the top end of the outer cylinder is provided with a top cover, the bracket is fixed at the bottom of the outer cylinder, an inner cylinder is arranged in the outer cylinder, an electromagnetic pump and an electromagnetic valve are arranged in the inner cylinder, an adjusting cavity is left between the outer cylinder and the inner cylinder, a prepressing elastic device is arranged in the adjusting cavity and surrounds the inner cylinder barrel, the bottom of the inner cylinder barrel is connected with a universal coupler for opening and closing the hydraulic valve through a coupling nut, the prepressing elastic device and the inner cylinder barrel synchronously move up and down, and the closing and opening operation of the hydraulic valve is controlled through the up and down movement of the inner cylinder barrel; this executor adopts pre-compaction resilient means to stop the emergence of potential safety hazard in the current maintenance process, and the output stroke extension of executor, the requirement of stroke is guaranteed in the confession pressure of many pumps, uses safe and reliable to when breaking down, can make the inner cylinder reset gradually under the resilience force effect of pre-compaction spring, the valve is closed.
Therefore, a novel scheme for resetting the corner electro-hydraulic actuator is needed in the prior art, so that the transmission precision ratio and the stability can be improved on the basis of the prior art, and the size of the device is reduced while the reset function is provided. Thereby better adapting to the requirements of the prior regulating valve market on strict control precision, system response and stability of the regulating valve.
Disclosure of Invention
The invention mainly aims to provide a corner resetting electro-hydraulic actuator, a control method thereof and a closed-loop hydraulic circuit, which are used for improving the transmission precision ratio and stability on the basis of the prior art and have the resetting function.
In order to achieve the above object, according to one aspect of the present invention, there is provided a return angle electro-hydraulic actuator including: the pneumatic cylinder, the converter, canceling release mechanical system, it is further still, the converter includes: the support, first conversion spare, the shaft coupling, wherein be equipped with the round pin axle on the shaft coupling, first conversion spare includes: the guide shaft sleeve and the steering part are arranged on a first position of the steering part, a guide shaft pipe is arranged on a second position of the steering part, a swing arm is arranged on the swing arm, a sliding groove is formed in the swing arm, a first accommodating area is formed between the swing arms at intervals, so that the coupler is arranged in the first accommodating area and is connected with the sliding groove through a pin shaft to establish transmission, transmission holes are formed in two sides of the support, the hydraulic cylinder and the reset mechanism are connected on two sides of the support, the transmission end of the hydraulic cylinder and the linkage end of the reset mechanism enter the inner cavity of the support through the transmission holes and are connected through the coupler, a guide shaft hole is further formed in the support, two ends of the guide shaft sleeve are connected to the guide shaft hole, at least part of the guide shaft sleeve body is inserted into the guide shaft pipe to be connected, so that the coupler is moved through the transmission end of the hydraulic cylinder, and the steering part, the second aspect compresses the reset mechanism.
In an alternative embodiment, the reset mechanism comprises: a sleeve, a spring set, a pressure plate pull member, wherein the spring set and the pressure plate pull member are housed within the sleeve, wherein the pressure plate pull member comprises: the spring assembly is sleeved on the piston rod and blocked by the pressure plate piece, so that the spring assembly is positioned between the sleeve and the pressure plate piece and forms a reset acting force when being compressed, wherein the spring assembly is formed by overlapping disc spring pieces.
In an alternative embodiment, the disk spring plate is folded in a manner of involution, and h thereof0/t≤3mm，h0'/t'≥1.667mm，De/Di≤3.34mm，h0≤6mm，h0'≥5mm，l0≤8mm，De≤157mm，Di47mm or less, wherein h is0/ h0'is the maximum/minimum vertical height from the inner diameter to the outer diameter of the dished spring piece, t/t' is the maximum/minimum thickness of the dished spring piece, and De/DiIs the outer diameter/inner diameter of the disc spring piece0The total height of the disk spring piece.
In an alternative embodiment, the pressure plate member is surrounded by a guide ring made of a material with a low friction coefficient, and the guide ring is higher than the pressure plate member to contact the inner wall of the sleeve.
In an optional implementation mode, the hydraulic cylinder support further comprises a guide rail piece, wherein the guide rail piece is fixed in the support inner cavity, is arranged at the position of the moving track of the coupler and is parallel to the extending/contracting track of the transmission end of the hydraulic cylinder, and a track hole is further formed in the coupler and is matched and connected with the guide rail piece.
In an alternative embodiment, the angle-resetting electro-hydraulic actuator further includes: the first end of the guide shaft sleeve is open, the inner part of the guide shaft sleeve is in a shape matched with the matching shaft, and the second end of the guide shaft sleeve is matched and connected with the rotary encoder.
In an optional embodiment, the first and second positions of the bracket are provided with adjusting holes for inserting an adjusting piece into the inner cavity of the bracket and extending the adjusting piece to the inner cavity of the bracket, and the position of the swing track of the swing arm forms a limit position.
In an optional embodiment, a cap is disposed on the first end of the sleeve, an air hole is disposed on the cap, and the air hole is communicated with the inner cavity of the sleeve, wherein the aperture of the air hole has a preset size, and the preset size includes controlling the exhaust/suction air amount in unit time to control the moving speed per hour of the pressure plate pull rod.
In an optional embodiment, a positioning groove is formed in the inner wall of the guide shaft pipe, a positioning block is arranged on the guide shaft sleeve body, when the guide shaft sleeve is inserted into the guide shaft pipe, the positioning block is matched and connected with the positioning groove, and a communicated pin hole is further formed in the guide shaft sleeve body and the guide shaft pipe so that a pin piece can be inserted and fixed to synchronize the rotation of the guide shaft sleeve and the guide shaft pipe.
In order to achieve the above object, according to another aspect of the present invention, there is also provided a closed-loop hydraulic circuit, wherein the angle electro-hydraulic actuator in the circuit is made of the above-mentioned reset angle electro-hydraulic actuator.
In order to achieve the above object, according to another aspect of the present invention, there is also provided a return rotation angle electro-hydraulic actuator control method, including the steps of: s1, controlling the hydraulic cylinder to linearly retract to a preset distance, and driving the steering piece to swing by a corresponding angle through the coupler so as to drive the guide shaft sleeve to synchronously rotate by the corresponding angle; s2 step S1, the coupler synchronously drives the pressure plate pull rod piece to compress the spring set in the sleeve; s3 when the hydraulic cylinder is out of work, the spring set releases the spring force to push the press plate pull rod piece to drive the coupler to move reversely, and the coupler is linked with the steering piece to swing reversely by a corresponding angle to drive the guide shaft sleeve to synchronously reset and rotate by a corresponding angle.
Through the reset corner electro-hydraulic actuator, the control method thereof and the closed-loop hydraulic circuit, the reset corner electro-hydraulic actuator realizes the reset function, and meanwhile, a disc spring sheet is adopted to replace the traditional spiral spring scheme in an optional mode, so that the volume of equipment is further reduced while the elasticity is ensured, and meanwhile, compared with the prior art, the adopted converter structure further improves the transmission precision ratio and the stability when linear motion is converted into angular motion, thereby better meeting the requirements of the existing regulating valve market on the strict control precision, the system response and the stability of the regulating valve.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of the overall structure of a resetting angle electro-hydraulic actuator of the invention, wherein a bracket and a sleeve are in perspective view;
FIG. 2 is a schematic diagram of a partial structure of the corner resetting electro-hydraulic actuator of the present invention, wherein the bracket and a portion of the connecting member are hidden to show the structure of the converter;
FIG. 3 is a schematic view of the assembly of a portion of the structure of the corner resetting electro-hydraulic actuator of the present invention, wherein the bracket and a portion of the connecting member are hidden to show the structure of the converter;
fig. 4 is a partial structural sectional view of the corner resetting electro-hydraulic actuator of the invention, wherein a steering member, a guide shaft sleeve, a partial connecting member and the like are hidden in order to show a partial structure of a converter and a resetting mechanism structure;
FIG. 5 is a schematic diagram of the dimensional structure design of a middle disc spring leaf of the corner resetting electro-hydraulic actuator according to the invention;
fig. 6 is a schematic diagram of spring force test data of a spring set of the corner resetting electro-hydraulic actuator according to the invention.
Description of the reference numerals
The hydraulic cylinder 1, the converter 2, the reset mechanism 3, the guide rail member 4, the first accommodation area 20, the bracket 21, the first conversion member 22, the coupler 23, the pin shaft 24, the guide shaft sleeve 25, the steering member 26, the guide shaft tube 27, the swing arm 28, the sliding groove 29, the guide shaft hole 211, the adjusting hole 212, the adjusting member 213, the positioning groove 271, the positioning block 251, the latch member 252, the disc spring piece 30, the sleeve 31, the spring assembly 32, the pressure plate pull rod member 33, the cap 34, the pressure plate member 331, the piston rod 332 and the guide ring 333.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined. And the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in combination with the prior art as the case may be. Furthermore, the embodiments and features of the embodiments of the present invention may be combined with each other without conflict. One or more of the illustrated components may be required or unnecessary, and the relative positions of the illustrated components may be adjusted according to actual needs.
Referring to fig. 1 to fig. 6, the present invention provides a corner resetting electro-hydraulic actuator, including: the hydraulic cylinder 1, converter 2, canceling release mechanical system 3, further, this converter 2 includes: support 21, first conversion 22, shaft coupling 23, wherein this first conversion 22, shaft coupling 23 are accomodate in this support 21 inner chamber, are equipped with round pin axle 24 and coupling hole on this shaft coupling 23, and this first conversion 22 includes: a guide shaft sleeve 25 and a steering member 26, wherein a guide shaft tube 27 is disposed on a first position of the steering member 26, a swing arm 28 is disposed on a second position, and a sliding slot 29 is disposed on the swing arm 28, wherein a first accommodating area 20 is spaced between the swing arms 28, so that the coupling 23 is disposed in the first accommodating area 20, and is coupled to the sliding slot 29 via the pin 24 to establish transmission between the coupling 23 and the first steering member 26.
Wherein, the two sides of the bracket 21 are provided with transmission holes, the hydraulic cylinder 1 is connected with the reset mechanism 3 at the two sides of the bracket 21, so that the transmission end of the hydraulic cylinder 1 and the linkage end of the reset mechanism 3 enter the inner cavity of the bracket 21 through the transmission hole and are inserted into the shaft coupling holes at the two sides of the shaft coupling 23 to form shaft transmission connection, wherein the bracket 21 is further provided with a guide shaft hole 211, two ends of the guide shaft sleeve 25 are connected with the guide shaft hole 211, and at least part of the sleeve body of the guide shaft sleeve 25 is inserted into the guide shaft tube 27 for connection, wherein in a preferred embodiment, the inner wall of the guide shaft tube 27 is provided with a positioning groove 271, the sleeve body of the guide shaft sleeve 25 is provided with a positioning block 251, when the guide shaft sleeve 25 is inserted into the guide shaft tube 27, the positioning block 251 is connected to the positioning groove 271, the sleeve body of the guide shaft sleeve 25 and the guide shaft tube 27 are provided with pin holes, for insertion fixation of the latch member 252, thereby synchronizing the rotation of the guide sleeve 25 with the guide shaft tube 27.
In addition, in other optional optimized embodiments, bearing sleeves may be further disposed at two ends of the guide shaft sleeve 25, so that the bearing sleeves are connected to the guide shaft hole 211, friction between the guide shaft sleeve 25 and the guide shaft hole 211 may be reduced, wear is reduced, and reliability is improved.
Therefore, through the arrangement of the above structure, the steering member 26 and the guide shaft sleeve 25 can form a rotary swing transmission shape to move the coupling 23 through the transmission end of the hydraulic cylinder 1, and on the first hand, the shaft pin on the coupling 23 moves in the sliding groove 29 on the swing arm 28 to drive the guide shaft pipe 27 to rotate, so as to link the guide shaft sleeve 25 to rotate synchronously, and the first end of the guide shaft sleeve 25 is open and is in a shape matched with the valve control rod in the sleeve, so that the guide shaft sleeve is matched and connected with the control rod of the valve, and the linear motion of the hydraulic cylinder 1 can be converted into angular rotation motion to rotate the valve to adjust. Compared with the existing gear rack control mode, the stepless adjustment of the steering angle can be realized by better utilizing the telescopic precision of the hydraulic cylinder 1, so that the adjustment precision and stability of the valve are greatly improved compared with the prior art.
In the second aspect, due to the transmission structure established by the converter 2, the transmission end of the hydraulic cylinder 1 can further compress the reset mechanism 3 while moving the coupler 23. It should be noted that, in this embodiment, the reset mechanism 3 may adopt a structure in the prior art, such as a mechanism of a piston-type structure compressing a spiral spring, so as to accumulate a reset elastic force by pushing the reset mechanism 3, so as to push back the coupler 23 after the hydraulic cylinder 1 fails, and drive the guide shaft sleeve 25 to reset and rotate, so as to control the valve to reset.
In order to reduce the volume of the reset mechanism 3 and maintain the required elastic force in a preferred embodiment, as shown in fig. 1 to 4, the reset mechanism 3 includes: a sleeve 31, a spring assembly 32, and a pressure plate pulling member 33, wherein the spring assembly 32 and the pressure plate pulling member 33 are accommodated in the sleeve 31, and the spring assembly 32 is formed by stacking a disc spring plate 30, wherein the pressure plate pulling member 33 includes: the first end of the piston rod 332 is connected with the pressure plate 331, the second end of the piston rod 332 is connected with the coupler 23, and the spring assembly 32 is sleeved on the piston rod 332 and is blocked by the pressure plate 331, so that a reset acting force is formed when the spring assembly 32 is compressed between the sleeve 31 and the pressure plate 331, and it is worth to mention that the spring force generated by the spring assembly 32 formed by overlapping the disk spring pieces 30 is larger than that generated by a coil spring with the same volume, so that the volume can be effectively reduced while the traditional coil spring is replaced.
It should be noted, however, that in the present embodiment, in order to further optimize the overlapping structure of the spring set 32 of the plate spring 30, so as to ensure that the plate spring 30 can generate sufficient return spring force for controlling the valve under the condition of reducing the volume of the spring set 32 to the utmost, wherein the plate spring 30 is preferably overlapped in a butt-joint manner, as shown in fig. 4, in the present embodiment, 104 pieces of the plate spring 30 are overlapped in a butt-joint manner by 26 pieces, and in order to realize the return force with large torque, as shown in fig. 5-6, the inventor further optimizes the structure of the plate spring 30, such as setting h0/t≤3mm，h0'/t'≥1.667mm，De/Di≤3.34mm，h0≤6mm，h0'≥5mm，l0≤8mm，De≤157mm，DiLess than or equal to 47mm, wherein h is0/ h0'is the maximum/minimum vertical height from the inner diameter to the outer diameter of the disc-shaped spring piece 30, t/t' is the maximum/minimum thickness of the disc-shaped spring piece 30, De/DiIs the outer diameter/inner diameter of the disc spring 300The total height of the disk spring piece 30. The design of the disc spring plate 30, the single piece/stacked load data, and the stress performance test data are shown in table 1.
TABLE 1
It can be seen that the spring assembly 32 of the laminated structure of the disk spring plate 30 designed in this embodiment is more compact in volume and can generate spring force as high as 15729N to 16166N in the interval of 100-140mm with relatively small deformation, so as to meet the requirement of controlling the large-torque valve to reset, thereby better meeting the requirements of the existing regulating valve market on strict control accuracy, system response and stability of the regulating valve.
On the other hand, in order to further optimize the return mechanism 3, the partial elastic force lost by the frictional force when the spring group 32 is returned is reduced, or the frictional force when the hydraulic cylinder 1 compresses the return mechanism 3 is reduced, thereby improving the stability. In a preferred embodiment, the pressure plate member 331 may further include a guide ring 333 hooped on the circumferential surface thereof, and the guide ring 333 is preferably made of a material with a low friction coefficient, such as: tetrafluoroethylene or copper powder and tetrafluoroethylene material, the guiding ring 333 is higher than the pressing plate 331 to contact the inner wall of the sleeve 31, so that the friction force between the pressing plate pulling member 33 and the inner wall of the sleeve 31 is reduced by the guiding ring 333, and the stabilizing effect is achieved.
On the other hand, in order to further optimize the stability of the converter 2, reduce structural vibration or deflection during transmission, and stabilize the transmission structure of the converter 2, in a preferred embodiment, in the corner resetting electro-hydraulic actuator, a rail member 4 is further included, the rail member 4 is fixed in the inner cavity of the bracket 21, is disposed at the moving track position of the coupler 23, and is parallel to the extending/retracting track of the transmission end of the hydraulic cylinder 1, wherein a track hole is further provided on the coupler 23 for being matched with the rail member 4. Therefore, when the hydraulic cylinder 1 pushes the coupler 23 to move, the coupler can be limited to move along the path of the guide rail part 4, so that the rotation of the first conversion part 22 is further stabilized, structural vibration or deviation is avoided, meanwhile, due to the structural design of the steering part 26, the guide rail part 4 can be positioned in the first accommodating area 20, interference on the steering part 26 is avoided, and meanwhile, the self-guiding and stabilizing function can be completed, so that a limited space can be effectively utilized in the inner cavity of the compact support 21, a mechanism with a stable transmission structure and a linear motion converted into an angular motion is created, and when the subsequent resetting is needed, the elastic impact force of the resetting mechanism 3 can be borne, the stable resetting of the whole transmission mechanism is ensured, and the reliability of the product is improved.
On the other hand, in order to facilitate the operation and control of the opening and closing amount of the adaptive valve and form control feedback, in a preferred embodiment, the resetting rotation angle electro-hydraulic actuator further comprises: a rotary encoder (not shown), wherein the first end of the guide shaft sleeve 25 is open, the guide shaft sleeve is in a shape matched with the matching shaft, and the second end of the guide shaft sleeve 25 is matched with the rotary encoder, so that when the guide shaft sleeve 25 rotates, the rotary encoder can obtain the rotation angle of the guide shaft sleeve 25, thereby forming a control feedback, facilitating the subsequent operation of the extension/retraction of the hydraulic cylinder 1, and further accurately controlling the opening/closing amount of the matching valve.
On the other hand, in order to control the maximum rotation angle and the minimum reset angle of the reset angle electro-hydraulic actuator to improve the degree of freedom of the installation, in this embodiment, the first and second positions of the bracket 21 are further provided with adjusting holes 212 for inserting the adjusting member 213 and extending to the inner cavity of the bracket 21, and the position of the swing track of the swing arm 28 forms a limit position. In this embodiment, the adjusting member 213 is a bolt, so that after being screwed into the inner cavity of the bracket 21, the adjusting member can extend to the moving path of the swing arm 28 of the steering member 26, thereby limiting the forward/backward rotation angle of the swing arm 28, and achieving an improvement in the degree of freedom of the arrangement.
On the other hand, in order to control the moving hour speed of the pressure plate pulling member 33, i.e. the returning hour speed of the spring set 32 during returning, and reduce the destructive influence of the instantaneous elastic force explosion on the whole transmission mechanism, in a preferred embodiment, a cap 34 is disposed on the first end of the sleeve 31, an air hole is disposed on the cap 34, the air hole is communicated with the inner cavity of the sleeve 31, wherein the aperture of the air hole has a preset size, the preset size comprises the discharge/suction amount per unit time, and the pressure plate pulling rod and the sleeve 31 are in a piston state, so that in a piston moving state, a certain amount of gas is necessarily sucked or discharged, and thus by setting different aperture sizes on the cap 34, the moving hour speed of the pressure plate pulling member 33 can be effectively controlled, and the elastic force explosion of the spring set 32 can be reduced. In addition, the cap 34 may be integrated with the sleeve 31 or may be detachably connected, such as screwed, so as to adjust the reset speed of the spring assembly 32 by replacing different caps 34, so as to meet the requirements of different valve reset controls.
In order to achieve the above object, according to another aspect of the present invention, there is also provided a closed-loop hydraulic circuit, wherein the angle electro-hydraulic actuator in the circuit is made of the above-mentioned reset angle electro-hydraulic actuator.
According to another aspect of the invention, a control method for a corner resetting electro-hydraulic actuator is also provided, and the steps comprise:
s1, the hydraulic cylinder 1 is controlled to linearly retract for a preset distance, and the steering piece 26 is driven to swing for a corresponding angle through the coupler 23 so as to drive the guide shaft sleeve 25 to synchronously rotate for a corresponding angle;
s2 is through S1 step the coupler 23 synchronously drives the pressure plate pull rod 33 to compress the spring set 32 in the sleeve 31;
s3 when the hydraulic cylinder 1 fails, the spring assembly 32 releases the spring force to push the platen pull rod 33, so as to drive the coupler 23 to move in the opposite direction and to link the steering member 26 to swing in the opposite direction for a corresponding angle, so as to drive the guide sleeve 25 to synchronously return to rotate in the corresponding angle.
In summary, according to the reset corner electro-hydraulic actuator, the control method thereof and the closed-loop hydraulic circuit provided by the invention, the reset corner electro-hydraulic actuator realizes the reset function, and meanwhile, the disc spring piece 30 is adopted to replace the traditional spiral spring scheme, so that the elasticity is ensured, and meanwhile, the equipment volume is further reduced, and meanwhile, compared with the prior art, the structure of the converter 2 adopted by the scheme further improves the transmission precision ratio and stability when linear motion is converted into angular motion, and can eliminate the overshoot oscillation phenomenon, so that the requirements of the existing regulating valve market on the strict control precision, system response and stability of the regulating valve can be better met.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof, and any modification, equivalent replacement, or improvement made within the spirit and principle of the invention should be included in the protection scope of the invention.
It will be appreciated by those skilled in the art that, in addition to implementing the system, apparatus and various modules thereof provided by the present invention in the form of pure computer readable program code, the same procedures may be implemented entirely by logically programming method steps such that the system, apparatus and various modules thereof provided by the present invention are implemented in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Therefore, the system, the device and the modules thereof provided by the present invention can be considered as a hardware component, and the modules included in the system, the device and the modules thereof for implementing various programs can also be considered as structures in the hardware component; modules for performing various functions may also be considered to be both software programs for performing the methods and structures within hardware components.
In addition, all or part of the steps of the method according to the above embodiments may be implemented by a program instructing related hardware, where the program is stored in a storage medium and includes several instructions to enable a single chip, a chip, or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In addition, any combination of various different implementation manners of the embodiments of the present invention is also possible, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the combination does not depart from the spirit of the embodiments of the present invention.
Claims (10)
1. A reset angle electro-hydraulic actuator comprising: hydraulic cylinder, converter, canceling release mechanical system, its characterized in that, the converter includes: the support, first conversion spare, the shaft coupling, wherein be equipped with the round pin axle on the shaft coupling, first conversion spare includes: the guide shaft sleeve and the steering piece are arranged on a first position of the steering piece, a guide shaft tube is arranged on a second position of the steering piece, a swing arm is arranged on the swing arm, a sliding groove is formed in the swing arm, a first accommodating area is formed between the swing arms at intervals, so that the shaft coupling is arranged in the first accommodating area, the hinge pin is connected with the sliding groove in a matching mode, transmission is established, the transmission end of the hydraulic cylinder is connected with the linkage end of the reset mechanism in the support inner cavity, the shaft coupling is formed in a connected mode, a guide shaft hole is formed in the support, the two ends of the guide shaft sleeve are connected to the opening of the guide shaft hole, at least part of the guide shaft sleeve body is inserted into the guide shaft tube, the guide shaft is connected with the inner end of the hydraulic cylinder in a moving mode, the shaft coupling is linked on the first aspect.
2. The corner resetting electro-hydraulic actuator of claim 1, wherein the resetting mechanism comprises: a sleeve, a spring set, a pressure plate pull member, wherein the spring set and the pressure plate pull member are housed within the sleeve, wherein the pressure plate pull member comprises: the spring assembly is sleeved on the piston rod and blocked by the pressure plate piece, so that the spring assembly is positioned between the sleeve and the pressure plate piece and forms a reset acting force when being compressed, wherein the spring assembly is formed by overlapping disc spring pieces.
3. The corner resetting electro-hydraulic actuator according to claim 2, wherein the disc spring pieces are folded in an involutory manner, and h is the same as h0/t≤3mm，h0'/t'≥1.667mm，De/Di≤3.34mm，h0≤6mm，h0'≥5mm，l0≤8mm，De≤157mm，Di47mm or less, wherein h is0/ h0' is the maximum/minimum vertical from the inner diameter to the outer diameter of the disc spring pieceThe straight height, t/t' is the maximum/minimum thickness of the disc-shaped spring piece, De/DiIs the outer diameter/inner diameter of the disc spring piece0The total height of the disk spring piece.
4. The corner electro-hydraulic actuator of claim 2, wherein the platen member has a guide ring circumferentially extending around the platen member, the guide ring being made of a low coefficient of friction material and being higher than the platen member to contact the sleeve inner wall.
5. The corner resetting electro-hydraulic actuator according to claim 1, further comprising a guide rail member, wherein the guide rail member is fixed in the inner cavity of the bracket, is arranged at the moving track position of the coupler, and is parallel to the extending/retracting track of the transmission end of the hydraulic cylinder, and a track hole is further formed in the coupler for being matched and connected with the guide rail member.
6. The corner resetting electro-hydraulic actuator according to claim 1, further comprising: the first end of the guide shaft sleeve is open, the inner part of the guide shaft sleeve is in a shape matched with the matching shaft, and the second end of the guide shaft sleeve is matched and connected with the rotary encoder.
7. The corner resetting electro-hydraulic actuator according to claim 2, wherein the sleeve has a cap at a first end thereof, the cap having an air hole therein, the air hole communicating with the inner cavity of the sleeve, wherein the aperture of the air hole has a predetermined size, and the predetermined size includes controlling the amount of air exhausted/sucked per unit time to control the speed per hour of movement of the pressure plate lever member.
8. The corner resetting electro-hydraulic actuator according to claim 1, wherein the inner wall of the guide shaft tube is provided with a positioning groove, the guide shaft sleeve body is provided with a positioning block, when the guide shaft sleeve is inserted into the guide shaft tube, the positioning block is matched and connected with the positioning groove, and the guide shaft sleeve body and the guide shaft tube are further provided with communicated pin holes for inserting and fixing the pin pieces so as to synchronize the rotation of the guide shaft sleeve and the guide shaft tube.
9. A closed loop hydraulic circuit, characterized in that the corner electro-hydraulic actuator in the circuit is made by using the reset corner electro-hydraulic actuator according to claims 1 to 8.
10. A control method for a reset corner electro-hydraulic actuator comprises the following steps:
s1, controlling the hydraulic cylinder to linearly retract to a preset distance, and driving the steering piece to swing by a corresponding angle through the coupler so as to drive the guide shaft sleeve to synchronously rotate by the corresponding angle;
s2 step S1, the coupler synchronously drives the pressure plate pull rod piece to compress the spring set in the sleeve;
s3 when the hydraulic cylinder is out of work, the spring set releases the spring force to push the press plate pull rod piece to drive the coupler to move reversely, and the coupler is linked with the steering piece to swing reversely by a corresponding angle to drive the guide shaft sleeve to synchronously reset and rotate by a corresponding angle.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011429987.0A CN112555493A (en) | 2020-12-07 | 2020-12-07 | Corner resetting electro-hydraulic actuator and control method thereof, and closed-loop hydraulic circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011429987.0A CN112555493A (en) | 2020-12-07 | 2020-12-07 | Corner resetting electro-hydraulic actuator and control method thereof, and closed-loop hydraulic circuit |
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| CN112555493A true CN112555493A (en) | 2021-03-26 |
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| CN202011429987.0A Pending CN112555493A (en) | 2020-12-07 | 2020-12-07 | Corner resetting electro-hydraulic actuator and control method thereof, and closed-loop hydraulic circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117889225A (en) * | 2024-03-12 | 2024-04-16 | 四川顺腾机械制造有限公司 | Pneumatic valve capable of adjusting compression stroke of spring |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117889225B (en) * | 2024-03-12 | 2024-05-10 | 四川顺腾机械制造有限公司 | Pneumatic valve capable of adjusting compression stroke of spring |
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Application publication date: 20210326 |