CN108799607A - Friction pulley reaction type Numeric hydraulic cylinder - Google Patents
Friction pulley reaction type Numeric hydraulic cylinder Download PDFInfo
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- CN108799607A CN108799607A CN201810967530.1A CN201810967530A CN108799607A CN 108799607 A CN108799607 A CN 108799607A CN 201810967530 A CN201810967530 A CN 201810967530A CN 108799607 A CN108799607 A CN 108799607A
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- friction pulley
- hydraulic fluid
- bearing
- fluid port
- spool
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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
- F16K31/124—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston servo actuated
- F16K31/1245—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston servo actuated with more than one valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/16—Special measures for feedback, e.g. by a follow-up device
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/202—Externally-operated valves mounted in or on the actuator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B2015/206—Combined actuation, e.g. electric and fluid actuated
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Multiple-Way Valves (AREA)
- Hydraulic Motors (AREA)
Abstract
The present invention discloses a kind of friction pulley reaction type Numeric hydraulic cylinder, including cylinder body, piston rod, connecting bracket, friction pulley feedback device, guiding valve and driving motor, friction pulley feedback device is installed on the front end of cylinder body by connecting bracket, one end of piston rod is provided with piston, and be set in cylinder body, the other end is connect with friction pulley feedback device；Guiding valve is set to above cylinder body, is provided with spool in the cavity of guiding valve, spool one end is connect with friction pulley feedback device, and the other end is connect by sliding sleeve with driving motor；Cylinder body is divided into ante-chamber and back cavity by piston, and the first hydraulic fluid port and the second hydraulic fluid port are respectively arranged on ante-chamber and back cavity, and the first hydraulic fluid port and the second hydraulic fluid port are also connected to guiding valve；Oil inlet and oil outlet are additionally provided on guiding valve.The present invention can slow down component wear, and mechanism is simple to manufacture, control accuracy is adjustable, reliability is high, has many advantages, such as long stroke, high speed, low cost using flexible closed loop location feedback link, can popularity use.
Description
Technical field
The present invention relates to Fluid Transmission and Control technical fields, and in particular to a kind of friction pulley reaction type Numeric hydraulic cylinder.
Background technology
Traditional Numeric hydraulic cylinder typically directly drives or controls spool by Bu Jin servo motors and coordinates again and valve
The internal feedback system that core is connected carries out real-time control to hydraulic cylinder.Motor direct-drive cannot monitor feedback hydraulic cylinder in real time
Inner case；And existing internal feedback system mainly has the shapes such as large pitch screw rod feedback, rack-and-pinion feedback, ball-screw
Formula belongs to rigid connector, is chronically under rigid shock working environment, is prone to wear out, pollute fluid, and manufacturing cost compared with
It is high.Chinese patent 200420084127.8 authorize a kind of two-stage screw internal foodback digital fluid cylinder, feedback device using
Large pitch precision auger bar, manufacturing cost is higher, and the too long performance on hydraulic cylinder of screw rod has certain influence, installation volume compared with
Greatly, do not have the industrial application value of long stroke, low price Numeric hydraulic cylinder；Chinese patent 201710771383.6 discloses one
The Numeric hydraulic cylinder that kind valve pocket can be servo-actuated, is combined into internal feedback system, ball screw is long using hollow piston rod and ball-screw
Phase infiltrates in hydraulic oil, causes mechanical wear to be easy pollution fluid, influences feedback accuracy, threaded hollow, which is made, in piston rod makes it
Intensity substantially reduces, and security performance cannot be guaranteed, and depends merely on the frictional force of piston to ensure that piston counter ball lead screw can only
Translation cannot rotate, and reliability is not high.Since factors above limits, Numeric hydraulic cylinder is also served only for certain special dimensions, and does not have
It can popularity use.
Therefore it provides a kind of friction pulley reaction type Numeric hydraulic cylinder, to solve the disadvantage present in the above-mentioned prior art, at
For present technical problem urgently to be resolved hurrily.
Invention content
The object of the present invention is to provide a kind of friction pulley reaction type Numeric hydraulic cylinders, above-mentioned of the existing technology to solve
Problem can slow down component wear using flexible closed loop location feedback link, and mechanism is simple to manufacture, control accuracy is adjustable, can
By property height, have many advantages, such as long stroke, high speed, low cost, it can popularity use.
To achieve the above object, the present invention provides following schemes：The present invention provides a kind of friction pulley reaction type number liquid
Cylinder pressure, including cylinder body, piston rod, connecting bracket, friction pulley feedback device, guiding valve and driving motor, the friction pulley feedback dress
The front end that the cylinder body is installed on by the connecting bracket is set, one end of the piston rod is provided with piston, and is set to institute
It states in cylinder body, the other end of the piston rod is connect with the friction pulley feedback device；The guiding valve is set on the cylinder body
It is square, it is provided with spool in the cavity of the guiding valve, described spool one end is connect with the friction pulley feedback device, and the other end passes through
The driving axis connection of sliding sleeve and the driving motor；
The cylinder body is divided into ante-chamber and back cavity by the piston, be respectively arranged on the ante-chamber and back cavity the first hydraulic fluid port and
Second hydraulic fluid port, first hydraulic fluid port and the second hydraulic fluid port are also connected to the guiding valve；It is additionally provided with oil inlet on the guiding valve and goes out
Hydraulic fluid port.
Preferably, the friction pulley feedback device includes friction pulley, rotation axis and roller gear, and the friction pulley is provided with
Two, the both sides of the piston rod are symmetrically disposed on, and frictional drive is constituted with the piston rod；In two friction pulleys
Portion is respectively provided with there are one perforative installation axle, and the both ends of the installation axle are rotatablely installed by first bearing in connection branch
On frame；Between the rotation axis is installed on two friction pulleys by bearing spider, the both ends of the rotation axis are respectively with two
The top of a installation axle is rotatablely connected by bevel gear；The roller gear is located at the top of the rotation axis, and with institute
The middle part outer wall for stating rotation axis constitutes gear drive, one end of the roller gear by connecting shaft be connected with for the valve
The feedback nut that core is threadedly coupled.
Preferably, the top of two installation axles is provided with first bevel gear, and the both ends of the rotation axis are each provided with
One second bevel gear is engaged with two first bevel gears respectively, and the first bevel gear drives the second bevel gear
Rotation, to drive the rotation axis to rotate.
Preferably, helical tooth is provided on the middle part outer wall of the rotation axis, the helical tooth connects with the roller gear
It connects, the roller gear is driven to rotate.
Preferably, the connecting shaft is rotatablely installed by the second bearing in the connecting bracket；Second axis
The front end held is provided with bearing (ball) cover, and the bearing (ball) cover is secured by bolts in the connecting bracket；The connecting shaft is leaned on
It is provided with the second connection flat key at the position of the nearly second bearing, is provided with to connect with described second on the bearing (ball) cover and put down
The corresponding annular spacing groove of key, the second connection flat key rotates in the annular spacing groove, after the second bearing
Side is provided with the 4th sealing ring.
Preferably, one end that the spool is connect with the sliding sleeve is provided with boss slider, is set on the inner wall of the sliding sleeve
Be equipped with sliding slot, the boss slider is installed in the sliding slot, and with the sliding slot clearance fit；The spool is close to the cunning
One end of set is provided with the first sealing ring.
Preferably, the sliding sleeve is installed on a link, and described link one end is installed on the side of the guiding valve, separately
One end is installed on by link bearing above the cylinder body.
Preferably, the driving motor is stepper motor, and the stepper motor is installed on the cylinder body by electric machine support
The front end of top, the electric machine support is provided with motor front end cover, and the output shaft of the stepper motor passes through the motor front end
Lid is fixedly connected with the sliding sleeve.
Preferably, the oil inlet is between first hydraulic fluid port and the second hydraulic fluid port, and there are two the oil outlet connections
Branch, two branches are separately connected the first oil outlet and the second oil outlet, and first oil outlet is located at first oil
The left side of mouth, second oil outlet are located at the right side of second hydraulic fluid port；It is convex there are two being also set up on the side wall of the spool
Block drives the convex block to turn off or on the oil outlet and oil inlet by moving left and right for spool.
Preferably, setting second has a sealing ring on the outer wall of the piston, there are two second sealing ring is arranged side by side；
In the cylinder body third sealing ring is provided at the position of the friction pulley feedback device.
The present invention achieves following technique effect compared with the existing technology：
The present invention constitutes flexible internal feedback system using friction pulley, can slow down and be caused in structural member rigid connection operation process
Abrasion, and feedback arrangement is placed in outside oil pocket, will not pollute fluid；By changing friction pulley diameter and bevel gear teeth
Number, modulus can change control accuracy and control speed；Using fully mechanical high-precision internal feedback, by adjusting friction pulley and work
Feedback control sensitivity can be improved in normal pressure between stopper rod, and hydraulic cylinder internal drive reliability is made to greatly improve；Each element structure
Simply, it is convenient for manufacture installation, cost is relatively low, can be widely used in various types of hydraulic pressure and control system.
Description of the drawings
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the present invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the vertical view of friction pulley reaction type Numeric hydraulic cylinder of the present invention；
Fig. 2 is A-A views in Fig. 1；
Fig. 3 is B-B views in Fig. 2；
Fig. 4 is the three-dimensional appearance figure of friction pulley reaction type Numeric hydraulic cylinder of the present invention；
Fig. 5 is the three-dimensional explosive view of friction pulley reaction type Numeric hydraulic cylinder of the present invention；
Fig. 6 is friction pulley reaction type Numeric hydraulic cylinder fundamental diagram of the present invention；
Wherein, 1. cylinder bodies, 2. spools, 3. guiding valves, 4. first sealing rings, 5. links, 6. sliding sleeves, 7. first connections are flat
Key, 8. link bearings, 9. motor front end covers, 10. stepper motors, 11. electric machine supports, 12. second sealing rings, 13. piston rods,
14. third sealing ring, 15. connecting brackets, 16. friction pulleys, 17. rotation axis, 18. bearing spiders, 19. second bevel gears, 20. circles
Stud wheel, 21. drive end bearing brackets, 22. second connection flat keys, 23. bearing (ball) covers, 24. second bearings, 25. the 4th sealing rings, 26. are instead
Present nut, 27. first bevel gears, 28. first bearings, the first hydraulic fluid ports of A., the second hydraulic fluid ports of B., P. oil inlets, O. oil return openings, O1.
First oil return opening, the second oil return openings of O2..
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The object of the present invention is to provide a kind of friction pulley reaction type Numeric hydraulic cylinders, above-mentioned of the existing technology to solve
Problem can slow down component wear using flexible closed loop location feedback link, and mechanism is simple to manufacture, control accuracy is adjustable, can
By property height, have many advantages, such as long stroke, high speed, low cost, it can popularity use.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, below in conjunction with the accompanying drawings and specific real
Applying mode, the present invention is described in further detail.
Embodiment one
As shown in figures 1 to 6, the present embodiment provides a kind of friction pulley reaction type Numeric hydraulic cylinders, including cylinder body 1, piston rod
13, connecting bracket 15, friction pulley feedback device, guiding valve 3 and driving motor, friction pulley feedback device are installed by connecting bracket 15
In the front end of cylinder body 1, one end of piston rod 13 is provided with piston, and is set in cylinder body 1, axial movement, piston in cylinder body 1
The other end of bar 13 is connect with friction pulley feedback device；Guiding valve 3 is set to 1 top of cylinder body, and spool is provided in the cavity of guiding valve 3
2,2 one end of spool is connect with friction pulley feedback device, the driving axis connection that the other end passes through sliding sleeve 6 and driving motor；
Piston divides cylinder body 1 for ante-chamber and back cavity, and the first hydraulic fluid port A and the second hydraulic fluid port B are respectively arranged on ante-chamber and back cavity,
First hydraulic fluid port A and the second hydraulic fluid port B are also connected to guiding valve 3；Oil inlet P and oil outlet 0 are additionally provided on guiding valve 3.
Specifically, connecting bracket 4 includes square frame, arc mounting bracket, square set setting are provided on square frame
In the front end of cylinder body 1, arc mounting bracket is fixed on the arc mounting plate of 1 upper front end of cylinder body setting, before connecting bracket 15
End is additionally provided with drive end bearing bracket 21.Friction pulley feedback device includes friction pulley 16, rotation axis 17 and roller gear 20, and friction pulley 16 is set
There are two setting, the both sides of piston rod 13 are symmetrically disposed on, and frictional drive is constituted with piston rod 13；The middle part of two friction pulleys 16
It is respectively provided with there are one perforative installation axle, the both ends of installation axle are rotatablely installed by first bearing 28 in connecting bracket 4 respectively
Top and bottom.Rotation axis 17 is installed on the top of square frame by bearing spider 18, and in two friction pulleys 16
Between, the top of the both ends of rotation axis 17 respectively with two installation axles is rotatablely connected by bevel gear；Specifically, two installation axles
Top is both provided with first bevel gear 27, and the both ends of rotation axis 17 are each provided with a second bevel gear 19, respectively with two
One bevel gear 27 engages, and first bevel gear 27 drives second bevel gear 19 to rotate, and drives rotation axis 17 to rotate to realize,
In, first bevel gear 27 is vertically arranged with second bevel gear 19, and rotation axis 17 is fixed by bearing spider 18, can only be rotated not
It can translation.
Roller gear 20 is vertically installed in the top of rotation axis 17, and constitutes gear with the middle part outer wall of rotation axis 17 and pass
It is dynamic, specifically, helical tooth is provided on the middle part outer wall of rotation axis 17, helical tooth is connect with roller gear 20, drives roller gear
20 rotations, and change the direction of motion.
Nut 26 is fed back in one end of roller gear 20 by connecting axis connection, and feedback nut 26 stretches into guiding valve 3 and spool 2
It is threadedly coupled, while band movable valve plug 2 rotates, spool 2 is also made to be translatable with axial.Connecting shaft is rotated by second bearing 24 pacifies
On arc mounting bracket loaded on connecting bracket 15；The front end of second bearing 24 is provided with bearing (ball) cover 23, and bearing (ball) cover 23 passes through
Bolt is fixed on arc mounting bracket；Connecting shaft is provided with the second connection flat key 22, bearing at the position of second bearing 24
Annular spacing groove corresponding with the second connection flat key 22 is provided on end cap 23, the second connection flat key 22 is in annular spacing groove
Rotation, roller gear 20 are limited in by the second connection flat key 22 between bearing (ball) cover 23 and second bearing 24, and can only rotate cannot
Translation.The rear side of second bearing 24 is provided with the 4th sealing ring 25, and the 4th sealing ring 25 is set to the arc of 1 upper front end of cylinder body
Sealing is fixed to connecting shaft in the junction of mounting plate and connecting shaft, prevents 3 inner fluid engaging friction wheel of guiding valve feedback dress
It sets.
Guiding valve 3 is secured by bolts on cylinder body 1, and front end is adjacent to the setting of arc mounting plate；The spool 2 of guiding valve 3 and cunning
One end of 6 connection of set is provided with boss slider, axial sliding slot is provided on the inner wall of sliding sleeve 6, boss slider is installed on sliding slot
It is interior, and with sliding slot clearance fit, so as to realize rotation and spool 2 of the spool 2 with sliding sleeve 6 along 6 inner wall sliding slot of sliding sleeve
Axial movement；Spool 2 is provided with the first sealing ring 4 close to one end of sliding sleeve 6 and is sealed.
Sliding sleeve 6 is installed on a link 5, and 5 one end of link is installed on the side of guiding valve 3, and the other end passes through link
Bearing 8 is installed on 1 top of cylinder body.Driving motor is stepper motor 10, and stepper motor 10 is installed on cylinder body 1 by electric machine support 11
The front end of top, electric machine support 11 is provided with motor front end cover 9, and the output shaft of stepper motor 10 passes through motor front end cover 9 and slides
Set 6 is fixedly connected.Specifically, the front end of 10 drive shaft of stepper motor is provided with the first connection flat key 7,6 inner wall of sliding sleeve and driving
The junction of axis is provided with keyway, and the first connection flat key 7 is installed in keyway, and is interference fitted with keyway, both to realize
Be fixedly connected.
Oil inlet P is between the first hydraulic fluid port A and the second hydraulic fluid port B, and there are two branch, two branches point for oil outlet O connections
The first oil outlet O is not connected1With the second oil outlet O2, the first oil outlet O1Positioned at the left side of the first hydraulic fluid port A, the second oil outlet O2
Positioned at the right side of the second hydraulic fluid port B；Convex block there are two being also set up on the side wall of spool 2, it is convex to drive by moving left and right for spool 2
Block turns off or on oil outlet O and oil inlet P.
When 10 return pulse signal of stepper motor, when drive shaft being driven to rotate, drive shaft passes through the first connection flat key 7
Sliding sleeve 6 is driven to rotate together, sliding sleeve 6 is rotated by inner wall sliding slot and 2 right end boss slider band movable valve plug 2 of spool, and passes through valve
The screw-driven that core 2 is constituted with feedback nut 26 promotes 2 right end boss slider of spool to be moved axially along 6 inner wall sliding slot of sliding sleeve.It rubs
The second bevel gear 19 for wiping first bevel gear 27 and 17 both ends of rotation axis on 16 tops of wheel constitutes gear driving pair, in rotation axis 17
Between helical tooth with feedback 26 left end of nut roller gear 20 constitute screw-driven, feedback nut 26 by second connection flat key 22,
Bearing (ball) cover 23 and second bearing 24 limit, and can only rotate, cannot be translatable, and promote the spool 2 that right end screw thread is connected therewith axial
Mobile handoff oil inlet pushes piston rod 13 to move, and piston rod 13 and friction pulley 16 constitute frictional drive, and then drive friction pulley
16 rotations, constitute closed loop location feedback mechanism.
There are two friction pulleys 16, is symmetrically mounted on 13 both ends of piston rod, makes that it is equally loaded, and can pass through and change friction pulley
16 diameters, adjustment improve control accuracy to 13 normal pressure of piston rod.17 both ends second bevel gear 19 of rotation axis and two friction pulleys
16 upper end first bevel gears 27 are sequentially connected, and uniform force, can only rotate cannot be translatable, by changing number of teeth in bevel gears and hypoid gears, modulus
Control accuracy, control speed and stroke can be improved.Stepper motor 10 is connect by the first connection flat key 7, sliding sleeve 6 with spool 2, is permitted
Perhaps spool 2 had not only been rotated but also had been moved.Setting second has sealing ring 12 on the outer wall of piston, and the second sealing ring 12, which is arranged side by side, two
It is a, prevent piston both sides cavity inner fluid from leaking；Third sealing is provided in cylinder body 1 at the position of friction pulley feedback device
Circle 14, third sealing ring 14 prevents oil pocket inner fluid from flowing out oil pocket with piston rod 13, and makes the piston contacted with friction pulley 16
13 part of bar remains drying, declines phenomena such as skidding without frictional force.
Friction pulley reaction type Numeric hydraulic cylinder specific work process is as follows in the present embodiment:The digital control servo system of hydraulic cylinder
System sends out digit pulse and rotates forward instruction, and wherein control system is existing system, and 10 return pulse signal of stepper motor simultaneously presses instruction
Rotating forward is generated, drives sliding sleeve 6 to rotate together by the first connection flat key 7, sliding sleeve 6 is acted on by the feather key between spool 2, band
Movable valve plug 2 rotates forward；Due to the screw-thread fit of 2 other end of spool and feedback nut 26, in rotation simultaneously with being moved to the left, and
Amount of movement is corresponding with digit pulse instruction.The left end convex block of spool 2 is communicated with spool movement closing and the first left sides hydraulic fluid port A
First oil outlet O1, and open and communicate oil inlet P on the right side of the first hydraulic fluid port A, spool right end convex block with spool move then closing and
The oil inlet P communicated on the left of second hydraulic fluid port B, and open the second oil outlet O communicated on the right side of the second hydraulic fluid port B2；High pressure liquid pressure oil
The first hydraulic fluid port A is then flowed through by oil inlet P and enters cylinder body rod chamber, and hydraulic oil is then flowed by the second hydraulic fluid port B in rodless cavity
Second oil outlet O2, oil cylinder is finally flowed into, piston rod 13 then moves right under the effect of two chamber hydraulic pressure differences, and drives two frictions
16 rotation of wheel, friction pulley 16 drives rotation axis 17 to rotate by first bevel gear 27 and second bevel gear 19, and passes through rotation axis
Screw thread among 17 drives feedback nut 26 to invert, and feedback nut 26 is by the second connection flat key 22, bearing (ball) cover 23 and the second axis
24 limitations are held, can only rotate cannot move axially, and due to feedback nut 26 and 2 left end screw-thread fit of spool, will push 2 turns of spool
It moves simultaneously and moves right, come the oil outlet for closing with the first hydraulic fluid port A the oil inlets communicated and being communicated with the second hydraulic fluid port B, piston
Bar stop motion, a stepping process terminate.
On the contrary, if digital hydraulic control system sends out digit pulse toggling command, stepper motor 10 inverts, and drives valve
Core 2 is inverted and is moved axially to the right, and spool right end convex block opens the oil inlet P communicated with the second hydraulic fluid port B, and is closed and the second oil
The second oil outlet O that mouth B is communicated2, spool left end convex block opens the first oil outlet O for being communicated with the first hydraulic fluid port A1, and close and the
The oil inlet that one hydraulic fluid port A is communicated, high pressure liquid pressure oil flows through the second hydraulic fluid port B by oil inlet P and enters rodless cavity, and liquid in rod chamber
Pressure oil then flows into oil outlet O by the first hydraulic fluid port A, and piston rod 13 is moved to the left, and friction pulley 16 is driven to rotate, anti-by friction pulley
Feedback device makes spool 2 be moved to the left, closing and the oil outlet the second hydraulic fluid port B the oil inlets communicated and communicated with the first hydraulic fluid port A.
Stepper motor 10 receives a certain number of pulse commands, is converted into the axial movement displacement of spool 2, and needs phase
Corresponding feedback quantity could close hydraulic fluid port, then can pass through friction pulley 16, first bevel gear 27, second bevel gear 19, feedback nut 26
The friction pulley reponse system of composition controls displacement and the speed of piston rod 13, to reach the rotation side for utilizing stepper motor 10
The purpose of the direction, speed or the position that move along a straight line to, rotary speed and rotation step number control cylinder piston rod.
The present invention constitutes flexible internal feedback system using friction pulley, can slow down and be caused in structural member rigid connection operation process
Abrasion, and feedback arrangement is placed in outside oil pocket, will not pollute fluid；By changing friction pulley diameter and bevel gear teeth
Number, modulus can change control accuracy and control speed；Using fully mechanical high-precision internal feedback, by adjusting friction pulley and work
Feedback control sensitivity can be improved in normal pressure between stopper rod, and hydraulic cylinder internal drive reliability is made to greatly improve；Each element structure
Simply, it is convenient for manufacture installation, cost is relatively low, can be widely used in various types of hydraulic pressure and control system.
Specific case is applied in the present invention, and principle and implementation of the present invention are described, above example
Illustrate the method and its core concept for being merely used to help understand the present invention；Meanwhile for those of ordinary skill in the art, according to
According to the thought of the present invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification
It should not be construed as limiting the invention.
Claims (10)
1. a kind of friction pulley reaction type Numeric hydraulic cylinder, it is characterised in that：It is anti-including cylinder body, piston rod, connecting bracket, friction pulley
Feedback device, guiding valve and driving motor, the friction pulley feedback device are installed on the front end of the cylinder body by the connecting bracket,
One end of the piston rod is provided with piston, and is set in the cylinder, the other end of the piston rod and the friction pulley
Feedback device connects；The guiding valve is set to above the cylinder body, and spool, the spool one are provided in the cavity of the guiding valve
End is connect with the friction pulley feedback device, the driving axis connection that the other end passes through sliding sleeve and the driving motor；
The cylinder body is divided into ante-chamber and back cavity by the piston, and the first hydraulic fluid port and second are respectively arranged on the ante-chamber and back cavity
Hydraulic fluid port, first hydraulic fluid port and the second hydraulic fluid port are also connected to the guiding valve；It is additionally provided with oil inlet and oil outlet on the guiding valve.
2. friction pulley reaction type Numeric hydraulic cylinder according to claim 1, it is characterised in that：The friction pulley feedback device
Including friction pulley, rotation axis and roller gear, there are two the friction pulley settings, is symmetrically disposed on the both sides of the piston rod,
And constitute frictional drive with the piston rod；Perforative installation axle there are one being respectively provided in the middle part of two friction pulleys, it is described
The both ends of installation axle are rotatablely installed by first bearing in the connecting bracket；The rotation axis is installed by bearing spider
Between two friction pulleys, the top of the both ends of the rotation axis respectively with two installation axles is rotated by bevel gear
Connection；The roller gear is located at the top of the rotation axis, and constitutes gear drive, institute with the middle part outer wall of the rotation axis
The one end for stating roller gear is connected with feedback nut for being threadedly coupled with the spool by connecting shaft.
3. friction pulley reaction type Numeric hydraulic cylinder according to claim 2, it is characterised in that：The top of two installation axles
End be provided with first bevel gear, the both ends of the rotation axis are each provided with a second bevel gear, respectively with two described first
Bevel gear engages, and the first bevel gear drives the second bevel gear rotation, to drive the rotation axis to rotate.
4. friction pulley reaction type Numeric hydraulic cylinder according to claim 3, it is characterised in that：Outside the middle part of the rotation axis
Helical tooth is provided on wall, the helical tooth is connect with the roller gear, and the roller gear is driven to rotate.
5. friction pulley reaction type Numeric hydraulic cylinder according to claim 1, it is characterised in that：The connecting shaft passes through described
Second bearing is rotatablely installed in the connecting bracket；The front end of the second bearing is provided with bearing (ball) cover, the bearing end
Lid is secured by bolts in the connecting bracket；The connecting shaft is provided with the second company at the position of the second bearing
Flat key is connect, annular spacing groove corresponding with the second connection flat key, second connection are provided on the bearing (ball) cover
Flat key rotates in the annular spacing groove, and the 4th sealing ring is provided on rear side of the second bearing.
6. friction pulley reaction type Numeric hydraulic cylinder according to claim 1 or 5, it is characterised in that：The spool with it is described
One end of sliding sleeve connection is provided with boss slider, sliding slot is provided on the inner wall of the sliding sleeve, the boss slider is installed on institute
State in sliding slot, and with the sliding slot clearance fit；The spool is provided with the first sealing ring close to one end of the sliding sleeve.
7. friction pulley reaction type Numeric hydraulic cylinder according to claim 6, it is characterised in that：The sliding sleeve is installed on a company
It connects on frame, described link one end is installed on the side of the guiding valve, and the other end is installed on the cylinder body by link bearing
Top.
8. friction pulley reaction type Numeric hydraulic cylinder according to claim 7, it is characterised in that：The driving motor is stepping
Motor, the stepper motor are installed on by electric machine support above the cylinder body, and the front end of the electric machine support is provided with motor
The output shaft of drive end bearing bracket, the stepper motor is fixedly connected across the motor front end cover with the sliding sleeve.
9. friction pulley reaction type Numeric hydraulic cylinder according to claim 8, it is characterised in that：The oil inlet is located at described
Between first hydraulic fluid port and the second hydraulic fluid port, there are two branches for the oil outlet connection, and it is fuel-displaced that two branches are separately connected first
Mouthful and the second oil outlet, first oil outlet be located at the left side of first hydraulic fluid port, second oil outlet is positioned at described the
The right side of two hydraulic fluid ports；Convex block there are two being also set up on the side wall of the spool, it is described convex to drive by moving left and right for spool
Block turns off or on the oil outlet and oil inlet.
10. friction pulley reaction type Numeric hydraulic cylinder according to claim 1, it is characterised in that：On the outer wall of the piston
Setting second has a sealing ring, there are two second sealing ring is arranged side by side；Close to friction pulley feedback dress in the cylinder body
Third sealing ring is provided at the position set.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112112864A (en) * | 2020-10-12 | 2020-12-22 | 辽宁工程技术大学 | Load pressure control type digital fluid cylinder |
| CN115355220A (en) * | 2022-09-22 | 2022-11-18 | 无锡君帆科技有限公司 | Hydraulic cylinder with piston rod capable of acting simultaneously |
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| CN115355220A (en) * | 2022-09-22 | 2022-11-18 | 无锡君帆科技有限公司 | Hydraulic cylinder with piston rod capable of acting simultaneously |
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| CN108799607B (en) | 2023-07-18 |
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