CN108799607B - Friction wheel feedback type digital hydraulic cylinder - Google Patents
Friction wheel feedback type digital hydraulic cylinder Download PDFInfo
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- CN108799607B CN108799607B CN201810967530.1A CN201810967530A CN108799607B CN 108799607 B CN108799607 B CN 108799607B CN 201810967530 A CN201810967530 A CN 201810967530A CN 108799607 B CN108799607 B CN 108799607B
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- wheel feedback
- valve core
- hydraulic cylinder
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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)
- Hydraulic Motors (AREA)
- Multiple-Way Valves (AREA)
Abstract
The invention discloses a friction wheel feedback type digital hydraulic cylinder which comprises a cylinder body, a piston rod, a connecting bracket, a friction wheel feedback device, a slide valve and a driving motor, wherein the friction wheel feedback device is arranged at the front end of the cylinder body through the connecting bracket; the sliding valve is arranged above the cylinder body, a valve core is arranged in a cavity of the sliding valve, one end of the valve core is connected with the friction wheel feedback device, and the other end of the valve core is connected with the driving motor through a sliding sleeve; the piston divides the cylinder body into a front cavity and a rear cavity, a first oil port and a second oil port are respectively arranged on the front cavity and the rear cavity, and the first oil port and the second oil port are also communicated with the slide valve; and the slide valve is also provided with an oil inlet and an oil outlet. The invention adopts flexible closed loop position feedback connection, can slow down the abrasion of the components, has the advantages of simple mechanism manufacture, adjustable control precision, high reliability, long travel, high speed, low manufacturing cost and the like, and can be widely popularized and used.
Description
Technical Field
The invention relates to the technical field of fluid transmission and control, in particular to a friction wheel feedback type digital hydraulic cylinder.
Background
The traditional digital hydraulic cylinder is usually directly driven by a stepping/servo motor or used for controlling a valve core and then matched with an internal feedback system connected with the valve core to control the hydraulic cylinder in real time. The internal condition of the feedback hydraulic cylinder cannot be monitored in real time due to direct driving of the motor; the existing internal feedback system mainly comprises a large-lead screw rod feedback mode, a gear rack feedback mode, a ball screw mode and the like, belongs to a rigid connecting piece, is in a rigid impact working environment for a long time, is easy to wear, pollutes oil, and is high in manufacturing cost. The double-stage spiral internal feedback digital fluid cylinder is authorized by Chinese patent 200420084127.8, the feedback device adopts a large-lead precise spiral rod, the manufacturing cost is high, the spiral rod is too long to have a certain influence on the performance of the hydraulic cylinder, the installation volume is large, and the industrial application value of the long-stroke low-price digital hydraulic cylinder is not realized; chinese patent 201710771383.6 discloses a valve pocket servo digital hydraulic cylinder, which adopts a hollow piston rod and a ball screw to combine into an internal feedback system, the ball screw is immersed in hydraulic oil for a long time, mechanical abrasion is caused to pollute the oil easily, feedback accuracy is affected, the piston rod is made into a thread hollow, so that the strength of the piston rod is greatly reduced, safety performance cannot be ensured, and the piston can only translate but not rotate relative to the ball screw by the friction force of the piston, so that the reliability is not high. Due to the limitation of the factors, the digital hydraulic cylinder is only used in certain special fields, but cannot be widely popularized and used.
Therefore, a friction wheel feedback type digital hydraulic cylinder is provided to solve the drawbacks of the prior art, and the technical problem is needed to be solved.
Disclosure of Invention
The invention aims to provide a friction wheel feedback type digital hydraulic cylinder, which solves the problems in the prior art, adopts flexible closed loop position feedback connection, can slow down the abrasion of components, has the advantages of simple mechanism manufacture, adjustable control precision, high reliability, long stroke, high speed, low manufacturing cost and the like, and can be widely popularized and used.
In order to achieve the above object, the present invention provides the following solutions: the invention provides a friction wheel feedback type digital hydraulic cylinder which comprises a cylinder body, a piston rod, a connecting bracket, a friction wheel feedback device, a slide valve and a driving motor, wherein the friction wheel feedback device is arranged at the front end of the cylinder body through the connecting bracket; the sliding valve is arranged above the cylinder body, a valve core is arranged in a cavity of the sliding valve, one end of the valve core is connected with the friction wheel feedback device, and the other end of the valve core is connected with a driving shaft of the driving motor through a sliding sleeve;
the piston divides the cylinder body into a front cavity and a rear cavity, a first oil port and a second oil port are respectively arranged on the front cavity and the rear cavity, and the first oil port and the second oil port are also communicated with the slide valve; and the slide valve is also provided with an oil inlet and an oil outlet.
Preferably, the friction wheel feedback device comprises two friction wheels, a rotating shaft and a cylindrical gear, wherein the two friction wheels are symmetrically arranged on two sides of the piston rod and form friction transmission with the piston rod; the middle parts of the two friction wheels are respectively provided with a penetrating installation shaft, and both ends of the installation shafts are rotatably installed on the connecting bracket through first bearings; the rotating shaft is arranged between the two friction wheels through a bearing support, and two ends of the rotating shaft are respectively and rotatably connected with the top ends of the two mounting shafts through bevel gears; the cylindrical gear is positioned above the rotating shaft and forms gear transmission with the outer wall of the middle part of the rotating shaft, and one end of the cylindrical gear is connected with a feedback nut in threaded connection with the valve core through a connecting shaft.
Preferably, the top ends of the two mounting shafts are provided with first bevel gears, two ends of the rotating shaft are respectively provided with a second bevel gear which is meshed with the two first bevel gears respectively, and the first bevel gears drive the second bevel gears to rotate, so that the rotating shaft is driven to rotate.
Preferably, a spiral tooth is arranged on the outer wall of the middle part of the rotating shaft, and the spiral tooth is connected with the cylindrical gear to drive the cylindrical gear to rotate.
Preferably, the connecting shaft is rotatably mounted on the connecting bracket through the second bearing; the front end of the second bearing is provided with a bearing end cover which is fixed on the connecting bracket through a bolt; the connecting shaft is provided with a second connecting flat key at a position close to the second bearing, the bearing end cover is provided with an annular limiting groove corresponding to the second connecting flat key, the second connecting flat key rotates in the annular limiting groove, and the rear side of the second bearing is provided with a fourth sealing ring.
Preferably, a protruding sliding block is arranged at one end, connected with the sliding sleeve, of the valve core, a sliding groove is arranged on the inner wall of the sliding sleeve, and the protruding sliding block is arranged in the sliding groove and is in clearance fit with the sliding groove; and a first sealing ring is arranged at one end of the valve core, which is close to the sliding sleeve.
Preferably, the sliding sleeve is arranged on a connecting frame, one end of the connecting frame is arranged on one side of the sliding valve, and the other end of the connecting frame is arranged above the cylinder body through a connecting frame support.
Preferably, the driving motor is a stepping motor, the stepping motor is mounted above the cylinder body through a motor support, a motor front end cover is arranged at the front end of the motor support, and an output shaft of the stepping motor penetrates through the motor front end cover and is fixedly connected with the sliding sleeve.
Preferably, the oil inlet is located between the first oil port and the second oil port, the oil outlet is connected with two branches, the two branches are respectively connected with a first oil outlet and a second oil outlet, the first oil outlet is located at the left side of the first oil port, and the second oil outlet is located at the right side of the second oil port; two lugs are further arranged on the side wall of the valve core, and the lugs are driven to close or open the oil outlet and the oil inlet through left and right movement of the valve core.
Preferably, a second sealing ring is arranged on the outer wall of the piston, and two second sealing rings are arranged side by side; and a third sealing ring is arranged at a position, close to the friction wheel feedback device, in the cylinder body.
Compared with the prior art, the invention has the following technical effects:
the flexible internal feedback system is formed by the friction wheels, so that abrasion caused in the rigid connection operation process of structural members can be relieved, and the feedback structure is arranged outside the oil cavity and cannot pollute oil; the control precision and the control speed can be changed by changing the diameter of the friction wheel and the number of teeth of the bevel gear and the modulus; the full-mechanical high-precision internal feedback is adopted, and the feedback control sensitivity can be improved by adjusting the positive pressure between the friction wheel and the piston rod, so that the internal transmission reliability of the hydraulic cylinder is greatly improved; the structure of each component is simple, the manufacturing and the installation are convenient, the cost is lower, and the hydraulic control system can be widely used in various hydraulic and control systems.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a top view of a friction wheel feedback digital hydraulic cylinder of the present invention;
FIG. 2 is view A-A of FIG. 1;
FIG. 3 is a view B-B of FIG. 2;
FIG. 4 is a three-dimensional view of the friction wheel feedback digital hydraulic cylinder of the present invention;
FIG. 5 is a three-dimensional exploded view of the friction wheel feedback digital hydraulic cylinder of the present invention;
FIG. 6 is a schematic diagram of the operation of the friction wheel feedback type digital hydraulic cylinder of the present invention;
the novel hydraulic engine comprises a cylinder body 1, a valve core 2, a sliding valve 3, a first sealing ring 4, a connecting frame 5, a sliding sleeve 6, a first connecting flat key 7, a connecting frame support 8, a motor front end cover 9, a stepping motor 11, a motor support 12, a second sealing ring 13, a piston rod 14, a third sealing ring 15, a connecting support 16, a friction wheel 17, a rotating shaft 18, a bearing support 19, a second bevel gear 20, a cylindrical gear 21, a front end cover 22, a second connecting flat key 23, a bearing end cover 24, a second bearing 25, a fourth sealing ring 26, a feedback nut 27, a first bevel gear 28, a first bearing A, a first oil port B, a second oil port P, an oil inlet O, an oil return port O, and O 1 First oil return port, O2 second oil return port.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a friction wheel feedback type digital hydraulic cylinder, which solves the problems in the prior art, adopts flexible closed loop position feedback connection, can slow down the abrasion of components, has the advantages of simple mechanism manufacture, adjustable control precision, high reliability, long stroke, high speed, low manufacturing cost and the like, and can be widely popularized and used.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1
As shown in fig. 1 to 6, the present embodiment provides a friction wheel feedback type digital hydraulic cylinder, which comprises a cylinder body 1, a piston rod 13, a connecting bracket 15, a friction wheel feedback device, a slide valve 3 and a driving motor, wherein the friction wheel feedback device is installed at the front end of the cylinder body 1 through the connecting bracket 15, one end of the piston rod 13 is provided with a piston and is arranged in the cylinder body 1, and moves axially in the cylinder body 1, and the other end of the piston rod 13 is connected with the friction wheel feedback device; the slide valve 3 is arranged above the cylinder body 1, a valve core 2 is arranged in a cavity of the slide valve 3, one end of the valve core 2 is connected with the friction wheel feedback device, and the other end of the valve core is connected with a driving shaft of the driving motor through a sliding sleeve 6;
the piston divides the cylinder body 1 into a front cavity and a rear cavity, a first oil port A and a second oil port B are respectively arranged on the front cavity and the rear cavity, and the first oil port A and the second oil port B are also communicated with the slide valve 3; the slide valve 3 is also provided with an oil inlet P and an oil outlet 0.
Specifically, the connecting bracket 4 comprises a square frame, an arc-shaped mounting frame is arranged on the square frame, the square frame is arranged at the front end of the cylinder body 1, the arc-shaped mounting frame is fixed on an arc-shaped mounting plate arranged on the upper portion of the front end of the cylinder body 1, and a front end cover 21 is further arranged at the front end of the connecting bracket 15. The friction wheel feedback device comprises two friction wheels 16, a rotating shaft 17 and a cylindrical gear 20, wherein the two friction wheels 16 are symmetrically arranged on two sides of the piston rod 13 and form friction transmission with the piston rod 13; the middle parts of the two friction wheels 16 are respectively provided with a penetrating installation shaft, and the two ends of the installation shafts are respectively rotatably installed at the top and the bottom of the connecting bracket 4 through a first bearing 28. The rotating shaft 17 is arranged above the square frame through a bearing support 18 and is positioned between the two friction wheels 16, and two ends of the rotating shaft 17 are respectively and rotatably connected with the top ends of the two mounting shafts through bevel gears; specifically, the top ends of the two mounting shafts are respectively provided with a first bevel gear 27, two ends of the rotating shaft 17 are respectively provided with a second bevel gear 19, the two second bevel gears are respectively meshed with the two first bevel gears 27, and the first bevel gears 27 drive the second bevel gears 19 to rotate, so that the rotating shaft 17 is driven to rotate, wherein the first bevel gears 27 are perpendicular to the second bevel gears 19, and the rotating shaft 17 is fixed by the bearing support 18 and can only rotate but not translate.
The cylindrical gear 20 is vertically arranged above the rotating shaft 17 and forms gear transmission with the middle outer wall of the rotating shaft 17, and particularly, spiral teeth are arranged on the middle outer wall of the rotating shaft 17 and connected with the cylindrical gear 20 to drive the cylindrical gear 20 to rotate and change the movement direction.
One end of the cylindrical gear 20 is connected with a feedback nut 26 through a connecting shaft, and the feedback nut 26 stretches into the slide valve 3 to be in threaded connection with the valve core 2, so that the valve core 2 rotates and simultaneously moves along with axial translation. The connecting shaft is rotatably arranged on the arc-shaped mounting frame of the connecting bracket 15 through a second bearing 24; the front end of the second bearing 24 is provided with a bearing end cover 23, and the bearing end cover 23 is fixed on the arc-shaped mounting frame through bolts; the connecting shaft is provided with a second connecting flat key 22 at a position close to the second bearing 24, the bearing end cover 23 is provided with an annular limiting groove corresponding to the second connecting flat key 22, the second connecting flat key 22 rotates in the annular limiting groove, and the cylindrical gear 20 is limited between the bearing end cover 23 and the second bearing 24 by the second connecting flat key 22 and can only rotate and cannot translate. The rear side of the second bearing 24 is provided with a fourth sealing ring 25, and the fourth sealing ring 25 is arranged at the joint of the arc-shaped mounting plate at the upper part of the front end of the cylinder body 1 and the connecting shaft, and is used for fixedly sealing the connecting shaft so as to prevent oil in the slide valve 3 from entering the friction wheel feedback device.
The slide valve 3 is fixed on the cylinder body 1 through a bolt, and the front end of the slide valve is tightly attached to the arc-shaped mounting plate; the spool 2 of the slide valve 3 is provided with a convex sliding block at one end connected with the slide sleeve 6, the inner wall of the slide sleeve 6 is provided with an axial sliding groove, the convex sliding block is arranged in the sliding groove and is in clearance fit with the sliding groove, so that the spool 2 can rotate along with the slide sleeve 6, and the spool 2 can axially move along the sliding groove on the inner wall of the slide sleeve 6; one end of the valve core 2, which is close to the sliding sleeve 6, is provided with a first sealing ring 4 for sealing.
The sliding sleeve 6 is arranged on a connecting frame 5, one end of the connecting frame 5 is arranged on one side of the sliding valve 3, and the other end of the connecting frame 5 is arranged above the cylinder body 1 through a connecting frame support 8. The driving motor is a stepping motor 10, the stepping motor 10 is arranged above the cylinder body 1 through a motor bracket 11, the front end of the motor bracket 11 is provided with a motor front end cover 9, and an output shaft of the stepping motor 10 passes through the motor front end cover 9 and is fixedly connected with the sliding sleeve 6. Specifically, the front end of the driving shaft of the stepping motor 10 is provided with a first connecting flat key 7, a key groove is formed in the joint of the inner wall of the sliding sleeve 6 and the driving shaft, and the first connecting flat key 7 is installed in the key groove and in interference fit with the key groove, so that the fixed connection of the first connecting flat key 7 and the key groove is realized.
The oil inlet P is positioned between the first oil port A and the second oil port B, the oil outlet O is connected with two branches, and the two branches are respectively connected with the first oil outlet O 1 And a second oil outlet O 2 First oil outlet O 1 A second oil outlet O is positioned at the left side of the first oil port A 2 The second oil port B is positioned on the right side of the second oil port B; two lugs are further arranged on the side wall of the valve core 2, and the lugs are driven to close or open the oil outlet O and the oil inlet P through the left-right movement of the valve core 2.
When the stepping motor 10 receives a pulse signal and drives the driving shaft to rotate, the driving shaft drives the sliding sleeve 6 to rotate together through the first connecting flat key 7, the sliding sleeve 6 drives the valve core 2 to rotate through the inner wall sliding groove and the protruding sliding block at the right end of the valve core 2, and the protruding sliding block at the right end of the valve core 2 is driven to axially move along the inner wall sliding groove of the sliding sleeve 6 through the threaded transmission formed by the valve core 2 and the feedback nut 26. The first bevel gear 27 at the top end of the friction wheel 16 and the second bevel gears 19 at the two ends of the rotating shaft 17 form a gear transmission pair, the middle spiral tooth of the rotating shaft 17 and the cylindrical gear 20 at the left end of the feedback nut 26 form a screw transmission, the feedback nut 26 is limited by the second connecting flat key 22, the bearing end cover 23 and the second bearing 24 and can only rotate but cannot translate, the valve core 2 connected with the screw thread at the right end of the feedback nut can be driven to axially move to switch the oil inlet, the piston rod 13 is pushed to move, the piston rod 13 and the friction wheel 16 form a friction transmission, and the friction wheel 16 is driven to rotate, so that a closed-loop position feedback mechanism is formed.
The two friction wheels 16 are symmetrically arranged at the two ends of the piston rod 13 to ensure that the force is uniform, and the positive pressure on the piston rod 13 can be adjusted by changing the diameter of the friction wheels 16, so that the control precision is improved. The second bevel gears 19 at the two ends of the rotating shaft 17 are in transmission connection with the first bevel gears 27 at the upper ends of the two friction wheels 16, the stress is even, only the rotation can be realized, the translation can not be realized, and the control precision, the control speed and the travel can be improved by modifying the tooth number and the modulus of the bevel gears. The stepping motor 10 is connected with the valve core 2 through the first connecting flat key 7 and the sliding sleeve 6, and allows the valve core 2 to rotate and move. The outer wall of the piston is provided with a second sealing ring 12, and two second sealing rings 12 are arranged side by side to prevent oil in cavities at two sides of the piston from leaking; a third sealing ring 14 is arranged in the cylinder body 1 at a position close to the friction wheel feedback device, the third sealing ring 14 prevents oil in the oil cavity from flowing out of the oil cavity along with the piston rod 13, and the part of the piston rod 13 contacted with the friction wheel 16 is always kept dry, so that phenomena such as friction force reduction and slipping are avoided.
The digital control servo system of the hydraulic cylinder sends out a digital pulse forward rotation instruction, wherein the control system is an existing system, the stepping motor 10 receives pulse signals and generates forward rotation according to the instruction, the sliding sleeve 6 is driven to rotate together through the first connecting flat key 7, and the sliding sleeve 6 drives the valve core 2 to rotate forward through the action of a sliding key between the sliding sleeve 6 and the valve core 2; because the other end of the valve core 2 is matched with the screw thread of the feedback nut 26, the valve core rotates and moves leftwards,and the amount of movement corresponds to the digital pulse command. The left end lug of the valve core 2 closes a first oil outlet O communicated with the left side of the first oil port A along with the movement of the valve core 1 The right end lug of the valve core moves along with the valve core to close the oil inlet P communicated with the left side of the second oil port B and open the second oil outlet O communicated with the right side of the second oil port B 2 The method comprises the steps of carrying out a first treatment on the surface of the The high-pressure hydraulic oil flows through the first oil port A through the oil inlet P and enters the rod cavity of the cylinder body, and the hydraulic oil in the rod-free cavity flows into the second oil outlet O through the second oil port B 2 Finally, the oil flows into the oil cylinder, the piston rod 13 moves rightwards under the action of the hydraulic pressure difference of two cavities and drives the two friction wheels 16 to rotate, the friction wheels 16 drive the rotating shaft 17 to rotate through the first bevel gear 27 and the second bevel gear 19, the feedback nut 26 is driven to rotate through threads in the middle of the rotating shaft 17, the feedback nut 26 is limited by the second connecting flat key 22, the bearing end cover 23 and the second bearing 24 and can only rotate and can not axially move, the valve core 2 is pushed to rotate and move rightwards simultaneously due to the threaded fit of the feedback nut 26 and the left end of the valve core 2, the oil inlet communicated with the first oil port A and the oil outlet communicated with the second oil port B are closed, the piston rod stops moving, and one stepping process is finished.
Conversely, if the hydraulic digital control system sends out a digital pulse inversion instruction, the stepping motor 10 inverts to drive the valve core 2 to invert and move axially rightwards, the right end lug of the valve core opens the oil inlet P communicated with the second oil port B and closes the second oil outlet O communicated with the second oil port B 2 The left end lug of the valve core opens a first oil outlet O communicated with the first oil port A 1 The high-pressure hydraulic oil flows through the second oil port B through the oil inlet P and enters the rodless cavity, hydraulic oil in the rod cavity flows into the oil outlet O through the first oil port A, the piston rod 13 moves leftwards to drive the friction wheel 16 to rotate, the valve core 2 moves leftwards through the friction wheel feedback device, and the oil inlet communicated with the second oil port B and the oil outlet communicated with the first oil port A are closed.
The stepping motor 10 receives a certain number of pulse instructions, converts the pulse instructions into axial movement displacement of the valve core 2, and needs corresponding feedback quantity to close the oil port, so that the displacement and the speed of the piston rod 13 can be controlled through a friction wheel feedback system consisting of the friction wheel 16, the first bevel gear 27, the second bevel gear 19 and the feedback nut 26, and the purpose of controlling the direction, the speed or the position of the linear motion of the cylinder piston rod by utilizing the rotation direction, the rotation speed and the rotation step number of the stepping motor 10 is achieved.
The flexible internal feedback system is formed by the friction wheels, so that abrasion caused in the rigid connection operation process of structural members can be relieved, and the feedback structure is arranged outside the oil cavity and cannot pollute oil; the control precision and the control speed can be changed by changing the diameter of the friction wheel and the number of teeth of the bevel gear and the modulus; the full-mechanical high-precision internal feedback is adopted, and the feedback control sensitivity can be improved by adjusting the positive pressure between the friction wheel and the piston rod, so that the internal transmission reliability of the hydraulic cylinder is greatly improved; the structure of each component is simple, the manufacturing and the installation are convenient, the cost is lower, and the hydraulic control system can be widely used in various hydraulic and control systems.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (9)
1. A friction wheel feedback type digital hydraulic cylinder is characterized in that: the friction wheel feedback device is arranged at the front end of the cylinder body through the connecting bracket, one end of the piston rod is provided with a piston and is arranged in the cylinder body, and the other end of the piston rod is connected with the friction wheel feedback device; the sliding valve is arranged above the cylinder body, a valve core is arranged in a cavity of the sliding valve, one end of the valve core is connected with the friction wheel feedback device, and the other end of the valve core is connected with a driving shaft of the driving motor through a sliding sleeve;
the piston divides the cylinder body into a front cavity and a rear cavity, a first oil port and a second oil port are respectively arranged on the front cavity and the rear cavity, and the first oil port and the second oil port are also communicated with the slide valve; the slide valve is also provided with an oil inlet and an oil outlet;
the friction wheel feedback device comprises two friction wheels, a rotating shaft and cylindrical gears, wherein the two friction wheels are symmetrically arranged on two sides of the piston rod and form friction transmission with the piston rod; the middle parts of the two friction wheels are respectively provided with a penetrating installation shaft, and both ends of the installation shafts are rotatably installed on the connecting bracket through first bearings; the rotating shaft is arranged between the two friction wheels through a bearing support, and two ends of the rotating shaft are respectively and rotatably connected with the top ends of the two mounting shafts through bevel gears; the cylindrical gear is positioned above the rotating shaft and forms gear transmission with the outer wall of the middle part of the rotating shaft, and one end of the cylindrical gear is connected with a feedback nut in threaded connection with the valve core through a connecting shaft; the valve core is provided with protruding slider with the one end that the sliding sleeve is connected, be provided with axial spout on the inner wall of sliding sleeve, protruding slider install in the spout, and with spout clearance fit.
2. The friction wheel feedback digital hydraulic cylinder of claim 1, wherein: the top ends of the two mounting shafts are provided with first bevel gears, two ends of the rotating shaft are respectively provided with a second bevel gear which is meshed with the two first bevel gears respectively, and the first bevel gears drive the second bevel gears to rotate so as to drive the rotating shaft to rotate.
3. The friction wheel feedback digital hydraulic cylinder of claim 2, wherein: the middle part outer wall of axis of rotation is provided with the helical tooth, the helical tooth with the cylindrical gear is connected, drives cylindrical gear rotates.
4. The friction wheel feedback digital hydraulic cylinder of claim 1, wherein: the connecting shaft is rotatably arranged on the connecting bracket through a second bearing; the front end of the second bearing is provided with a bearing end cover which is fixed on the connecting bracket through a bolt; the connecting shaft is provided with a second connecting flat key at a position close to the second bearing, the bearing end cover is provided with an annular limiting groove corresponding to the second connecting flat key, the second connecting flat key rotates in the annular limiting groove, and the rear side of the second bearing is provided with a fourth sealing ring.
5. The friction wheel feedback digital hydraulic cylinder according to claim 1 or 4, characterized in that: and a first sealing ring is arranged at one end of the valve core, which is close to the sliding sleeve.
6. The friction-wheel feedback digital hydraulic cylinder of claim 5, wherein: the sliding sleeve is arranged on a connecting frame, one end of the connecting frame is arranged on one side of the sliding valve, and the other end of the connecting frame is arranged above the cylinder body through a connecting frame support.
7. The friction wheel feedback digital hydraulic cylinder of claim 6, wherein: the driving motor is a stepping motor, the stepping motor is mounted above the cylinder body through a motor support, a motor front end cover is arranged at the front end of the motor support, and an output shaft of the stepping motor penetrates through the motor front end cover and is fixedly connected with the sliding sleeve.
8. The friction-wheel feedback digital hydraulic cylinder of claim 7, wherein: the oil inlet is positioned between the first oil port and the second oil port, the oil outlet is connected with two branches, the two branches are respectively connected with a first oil outlet and a second oil outlet, the first oil outlet is positioned at the left side of the first oil port, and the second oil outlet is positioned at the right side of the second oil port; two lugs are further arranged on the side wall of the valve core, and the lugs are driven to close or open the oil outlet and the oil inlet through left and right movement of the valve core.
9. The friction wheel feedback digital hydraulic cylinder of claim 1, wherein: the outer wall of the piston is provided with a second sealing ring, and two second sealing rings are arranged side by side; and a third sealing ring is arranged at a position, close to the friction wheel feedback device, in the cylinder body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810967530.1A CN108799607B (en) | 2018-08-23 | 2018-08-23 | Friction wheel feedback type digital hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810967530.1A CN108799607B (en) | 2018-08-23 | 2018-08-23 | Friction wheel feedback type digital hydraulic cylinder |
Publications (2)
| Publication Number | Publication Date |
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| CN108799607A CN108799607A (en) | 2018-11-13 |
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| CN112112864B (en) * | 2020-10-12 | 2022-09-02 | 辽宁工程技术大学 | Load pressure control type digital fluid cylinder |
| CN115355220B (en) * | 2022-09-22 | 2023-05-19 | 无锡君帆科技有限公司 | Hydraulic cylinder with piston rods capable of simultaneously acting |
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