CN111043099B - Symmetrical digital hydraulic cylinder - Google Patents
Symmetrical digital hydraulic cylinder Download PDFInfo
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- CN111043099B CN111043099B CN201911185257.8A CN201911185257A CN111043099B CN 111043099 B CN111043099 B CN 111043099B CN 201911185257 A CN201911185257 A CN 201911185257A CN 111043099 B CN111043099 B CN 111043099B
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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
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1404—Characterised by the construction of the motor unit of the straight-cylinder type in clusters, e.g. multiple cylinders in one block
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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
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/021—Valves for interconnecting the fluid chambers of an 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
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
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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
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1428—Cylinders
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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
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
- F15B15/1452—Piston sealings
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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
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1457—Piston rods
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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
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/149—Fluid interconnections, e.g. fluid connectors, passages
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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
- F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
- F15B15/224—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having a piston which closes off fluid outlets in the cylinder bore by its own movement
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Actuator (AREA)
Abstract
The invention discloses a symmetrical digital hydraulic cylinder which comprises a driving mechanism, a slide valve, a feedback mechanism, a double-rod piston rod, a hydraulic pipeline and a cylinder barrel. The invention adopts the symmetric valve to control the double-rod symmetric hydraulic cylinder to keep the characteristics of the piston rod in two-way motion consistent, eliminates pressure jump in reversing, and reduces the influence of vibration and impact on positioning precision and the service life of a digital hydraulic cylinder system.
Description
Technical Field
The invention relates to the technical field of servo systems, in particular to a symmetrical digital hydraulic cylinder.
Background
The digital hydraulic cylinder, also called stepping hydraulic cylinder, is a high and new technology product which combines the mechanical feedback of the positions of a stepping or servo motor, a hydraulic slide valve and a piston rod in the hydraulic cylinder, connects a hydraulic oil source, and directly controls the position or the speed of the piston rod through digital pulse signals sent by a digital hydraulic cylinder controller or a computer or a programmable logic controller.
However, in actual engineering, in order to save space, an asymmetric digital hydraulic cylinder is generally used. When the piston rod of the asymmetric digital hydraulic cylinder extends out, pressure oil is communicated with the rodless cavity through the throttling window, and the rod cavity is communicated with the oil return pipe through the throttling window; when the piston rod retracts, the pressure oil is communicated with the rod cavity through the throttling window, and the rodless cavity is communicated with the oil return cavity through the throttling window. Because the effective areas of the two cavities are different, if the asymmetric cylinder is controlled by a symmetric hydraulic slide valve, the pressure of the two cavities can jump when the moving direction of the piston rod is changed even under the condition of no external load; in the case of external load variation, overpressure, cavitation, etc. may occur. And the dynamic and static characteristics of the forward and reverse motion of the piston rod are different. When the piston rod is displaced, there may be oscillations during the reversal, which may lead to jerky movements. This phenomenon accelerates failure of the seal, damages internal components such as connectors and bearings, and affects reliability and life, and particularly, the ball screw is subject to increased wear under vibration and impact environments, which leads to reduced precision and even failure.
Therefore, the technical problem to be solved by the present invention is how to provide a symmetric digital hydraulic cylinder capable of eliminating pressure jump during reversing, reducing vibration and impact, and ensuring consistent dynamic and static characteristics of bidirectional movement of a piston rod.
Disclosure of Invention
In view of the above, the present invention provides a symmetric digital hydraulic cylinder, which uses a symmetric valve to control a dual-piston symmetric hydraulic cylinder to keep the characteristics of the piston rods consistent during the two-way movement, thereby eliminating the pressure jump during the reversing, and reducing the influence of vibration and impact on the positioning accuracy and the service life of the digital hydraulic cylinder system.
In order to achieve the purpose, the invention adopts the following technical scheme: a symmetric digital hydraulic cylinder, comprising: the device comprises a driving mechanism, a slide valve, a feedback mechanism, a double-outlet-rod piston rod, a hydraulic pipeline and a cylinder barrel.
The spool valve includes: the valve body is arranged in the valve body, one end of the valve core extends out of the valve body and is connected with the output end of the driving mechanism, and therefore the driving mechanism can drive the valve core to rotate.
The feedback mechanism includes: the feedback valve comprises a feedback threaded sleeve, a bearing and a ball screw shaft, wherein one end of the feedback threaded sleeve is in threaded connection with the other end of the valve core, and the other end of the feedback threaded sleeve is connected with the ball screw shaft; the inner ring of the bearing is fixed with the feedback threaded sleeve, and the outer ring of the bearing is fixedly connected with the valve body;
the cylinder barrel includes: the cylinder comprises a front cylinder barrel and a rear cylinder barrel, wherein a front end cover and a rear end cover are respectively arranged at two ends of the front cylinder barrel, and the rear end cover is fixed with the rear cylinder barrel; the other end of the rear cylinder barrel is fixedly installed with the valve body;
the double-out-rod piston rod comprises: the piston can slide in the front cylinder barrel; one end of the rear piston rod is provided with an external thread and screwed in the piston, the other end of the rear piston rod is hollow, a screw nut is installed in the hollow piston rod through a screw nut installation seat, and a ball screw shaft penetrates through the interior of the screw nut; the front piston rod is screwed at the other end of the piston through threads;
the hydraulic circuit includes: the first hydraulic pipeline and the second hydraulic pipeline are both communicated with an oil passage in the valve body and are positioned on the outer sides of the front cylinder barrel and the rear cylinder barrel, the first hydraulic pipeline is communicated with a cavity in the front cylinder barrel, which is close to one side of the front end cover, and the second hydraulic pipeline is communicated with a cavity in the front cylinder barrel, which is close to one side of the rear end cover.
The symmetrical digital hydraulic cylinder disclosed by the invention adopts the symmetrical hydraulic cylinder with the double-rod piston rod to keep the characteristics of the piston rod in two-way motion consistent, eliminates pressure jump in reversing, and reduces the influence of vibration and impact on positioning precision and the service life of a digital hydraulic cylinder system.
Preferably, actuating mechanism includes step motor, flange and motor coupling, step motor passes through the flange to be fixed on the valve body, and output shaft the motor coupling, set up the groove of twice symmetry and with the form of shift fork on the motor coupling and with the case links to each other for can realize relative translation when case and motor coupling do not have relative rotation.
Preferably, the valve core adopts a non-full-circumference opening valve, so that the requirement on the cleanliness of oil can be reduced, and the valve core is more suitable for severe environments in actual working conditions; and one end of the valve core is provided with a chamfer, so that the valve core is convenient to be matched with the valve body.
Preferably, the bearing comprises a first bearing and a second bearing, the first bearing and the second bearing are both angular contact bearings, axial force can be conveniently borne, the outer diameter of the first bearing is smaller than that of the second bearing, the bearing is convenient to mount and dismount, maintainability is improved, and a bearing gland is fixedly mounted on the outer side of the second bearing and used for fixing the outer side of the bearing.
Preferably, an external thread is processed at one end of the valve core close to the feedback threaded sleeve, and the feedback threaded sleeve is provided with an internal thread matched with the external thread. The external thread and the internal thread form a thread pair to realize the relative movement of the valve core and the feedback thread sleeve.
Preferably, the rear piston rod is provided with a small hole, so that air inside the cavity and air outside the cavity can be conveniently circulated. If the cavity is completely sealed, when the piston rod moves towards the ball screw shaft side, the gas pressure in the cavity is increased, otherwise, the gas pressure in the cavity is reduced, and the movement of the ball screw shaft is affected, so that the damage is caused.
Preferably, the cylinder mechanism further comprises a front foot rest and a rear foot rest, the front foot rest is mounted on the front end cover, the rear foot rest is mounted on the valve body, and the front foot rest and the rear foot rest are mounted on the test bench through bolts, so that the test is facilitated.
Preferably, a first pipe joint is arranged between the first hydraulic pipeline and the valve body, a second pipe joint is installed between the first hydraulic pipeline and the right cavity of the hydraulic cylinder, and a third pipe joint is installed between the second hydraulic pipeline and the left cavity of the hydraulic cylinder. The first pipe joint, the second pipe joint and the third pipe joint are all used for hydraulic oil transition and direction conversion.
Preferably, a sealing ring is arranged between the front cylinder barrel and the piston, so that a good sealing effect is ensured.
Preferably, the feedback thread sleeve is fixedly connected with the ball screw shaft through a pin.
Compared with the prior art, the technical scheme has the advantages that the symmetrical digital hydraulic cylinder is provided, the characteristics of the piston rod in two-way movement are kept consistent by adopting the double-piston symmetrical hydraulic cylinder, the pressure jump in reversing is eliminated, the influence of vibration and impact on the positioning precision and the service life of the digital hydraulic cylinder system is reduced, and in addition, the installation and the test are more convenient.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram provided by the present invention.
Figure 2 is a cross-sectional view a-a provided by the present invention.
FIG. 3 is a flow diagram of oil provided by the present invention.
Wherein, the reference numerals are, for example,
the hydraulic control device comprises a stepping motor 1, a flange 2, a motor coupler 3, a valve core 4, a valve body 5, an oil passage on the valve body 6, a first pipe joint 7, a first bearing 8, a feedback screw sleeve 9, a second bearing 10, a bearing gland 11, a pin 12, a ball screw shaft 13, a screw nut 14, a screw nut mounting seat 15, a rear cylinder 16, a rear piston rod 17, a rear end cover 18, a front cylinder 19, a piston 20, a sealing ring 21, a front piston rod 22, a first hydraulic pipeline 23, a second pipe joint 24, a front end cover 25, a front foot rest 26, a third pipe joint 27, a second hydraulic pipeline 28 and a rear foot rest 29.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The embodiment of the invention discloses a symmetrical digital hydraulic cylinder, which comprises: actuating mechanism, slide valve, feedback mechanism, two play pole piston rods, hydraulic line and cylinder, the slide valve includes: the valve core 4 is arranged in the valve body 5, and one end of the valve core 4 extends out of the valve body 5 and is connected with the output end of the driving mechanism; the feedback mechanism includes: the feedback valve comprises a feedback threaded sleeve 9, a bearing and a ball screw shaft 13, wherein one end of the feedback threaded sleeve 9 is in threaded connection with the other end of the valve core 4, and the other end of the feedback threaded sleeve is connected with the ball screw shaft 13; the inner ring of the bearing is fixed with the feedback threaded sleeve 9, and the outer ring of the bearing is fixedly connected with the valve body 5; the cylinder section includes: the front cylinder 19 and the rear cylinder 16, the front end cover 25 and the rear end cover 18 are respectively arranged at two ends of the front cylinder 19, and the rear end cover 18 is fixed with the rear cylinder 16; the other end of the rear cylinder barrel 16 is fixedly arranged with the valve body 5; the double-out rod piston rod comprises: a piston 20, a rear piston rod 17 and a front piston rod 22, the piston 20 being slidably connected within the front cylinder 19; one end of the rear piston rod 17 is provided with an external thread and screwed in the piston 20, the other end of the rear piston rod is hollow, a screw nut 14 is installed in the rear piston rod through a screw nut installation seat 15, and the screw nut 14 is installed on the ball screw shaft 13; the front piston rod 22 is screwed on the other end of the piston 20; the hydraulic circuit includes: the first hydraulic pipeline 23 and the second hydraulic pipeline 28 are communicated with the oil channel 6 in the valve body 5, the first hydraulic pipeline 23 and the second hydraulic pipeline 28 are located on the outer sides of the front cylinder 19 and the rear cylinder 16, the first hydraulic pipeline 23 is communicated with a cavity in the front cylinder 19 on one side close to the front end cover 25, and the second hydraulic pipeline 28 is communicated with a cavity in the front cylinder 19 on one side close to the rear end cover 18.
In order to further optimize the technical scheme, the driving mechanism comprises a stepping motor 1, a flange 2 and a motor coupler 3, the stepping motor 1 is fixed on the valve body 5 through the flange 2, an output shaft is connected with the motor coupler 3, two symmetrical grooves are formed in the motor coupler 3 in the axial direction, and the motor coupler is connected with the valve core 4 in a shifting fork mode to ensure that relative rotation is avoided and relative translation can be achieved.
In order to further optimize the technical scheme, the valve core 4 adopts a non-full-circumference opening valve, so that the requirement on the cleanliness of oil can be reduced, and the valve is more suitable for severe environments in actual working conditions; and one end of the valve core 4 is provided with a chamfer angle, so that the valve core 4 is convenient to be matched with the valve body 5.
In order to further optimize the technical scheme, the bearing comprises a first bearing and a second bearing, the first bearing 8 and the second bearing 10 are both angular contact bearings and can better bear axial force, the outer diameter of the first bearing 8 is smaller than that of the second bearing 10, the bearing is more convenient to mount and dismount, and maintainability is enhanced. And a bearing gland 11 is fixedly arranged on the outer side of the second bearing.
In order to further optimize the technical scheme, an external thread is processed at one end of the valve core 4 close to the feedback threaded sleeve 9, and the feedback threaded sleeve 9 is provided with an internal thread matched with the external thread.
In order to further optimize the technical scheme, the rear piston rod 17 is provided with a small hole, so that air inside the cavity and air outside the cavity can be conveniently circulated.
In order to further optimize the technical scheme, the cylinder mechanism further comprises a front foot rest 26 and a rear foot rest 29, the front foot rest 26 is installed on the front end cover 25, the rear foot rest 29 is installed on the valve body 5, and the front foot rest 26 and the rear foot rest 29 are installed on a test bench through bolts, so that the test is convenient.
In order to further optimize the above technical solution, a first pipe joint 7 for oil passage transition and conversion is arranged between the first hydraulic line 23 and the valve body 5; a second pipe joint 24 for oil path transition and conversion is arranged between the first hydraulic pipeline 23 and the right cavity of the hydraulic cylinder, and a third pipe joint 27 for oil path transition and conversion is arranged between the second hydraulic pipeline 28 and the left cavity of the hydraulic cylinder.
In order to further optimize the above technical solution, a sealing ring 21 is arranged between the front cylinder 19 and the piston 20 to ensure the sealing between the front cylinder 19 and the piston 20.
In order to further optimize the above solution, the feedback screw 9 is fixedly connected to the ball screw shaft 13 via a pin 12.
The working process of the symmetrical digital hydraulic cylinder disclosed by the invention is as follows: the driver of the stepping motor 1 receives the pulse signal and the direction signal sent by the upper computer, and controls the winding current of the stepping motor 1 to change, thereby controlling the rotation angle of the stepping motor 1. The stepping motor 1 drives the valve core 4 to rotate by an angle through the motor coupler 3. The right end of the valve core 4 is provided with an external thread which is screwed into the internal thread at the left end of the feedback thread sleeve 9. When the valve element 4 rotates, the feedback screw 9 is fixed by the first bearing 8 and the second bearing 10 and cannot move in the axial direction, and the right end of the feedback screw 9 is fixedly connected with the ball screw shaft 13 through the pin 12, and at this time, the feedback screw 9 does not rotate because the rear piston rod 17 does not move yet and the ball screw shaft 13 does not rotate. The valve core 4 is forced to rotate and generate axial movement due to the thread pair effect of the external thread of the valve core 4 and the internal thread of the feedback shaft sleeve 9. Taking the valve core 4 moving to the right as an example. The throttle window of the valve is opened, the pressure oil is communicated with the right cavity of the hydraulic cylinder through the throttle window between the valve core 4 and the valve body 5, the oil channel 6 on the valve body 5 and the first hydraulic pipeline 23, and the left cavity of the hydraulic cylinder is communicated with the oil return port through the hydraulic pipeline 28 and the oil channel on the valve body. Under the push of the hydraulic oil, the piston 20 will drive the front piston rod 22 and the rear piston rod 17 to translate. Since the rear piston rod 17 is provided with the screw nut 14 through the screw nut seat 15 and the feedback screw sleeve 9 cannot move axially, the ball screw shaft 13 drives the feedback screw sleeve 9 to rotate. The rotation direction is the same as the rotation direction of the valve core 4, and the valve core 4 is forced to gradually return to the original position due to the action of the thread pair, so that the mechanical negative feedback of the displacement of the rear piston rod 17 is realized. When the valve core 4 returns to the original position, the valve port is closed, and the front piston rod 22 and the rear piston rod 17 of the hydraulic cylinder stop moving. The direction, speed and displacement of the piston rod are controlled by the upper computer to control the rotating direction, rotating speed and angle of the stepping motor. Because the oil-liquid action areas of the two cylinders of the hydraulic cylinder are equal and the symmetrical valve is used for controlling, the pressure jump of the two cavities of the hydraulic cylinder is avoided when the valve core is reversed, and the reversing stability is ensured. Since the digital pulse signal and the level signal indicating the moving direction are very easy to implement, the control of the positions of the front 22 and rear 17 piston rods is conveniently achieved by means of mechanical feedback.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A symmetric digital hydraulic cylinder, comprising: a driving mechanism, a slide valve, a feedback mechanism, a double-outlet-rod piston rod, a hydraulic pipeline and a cylinder barrel,
the spool valve includes: the valve comprises a valve body (5) and a valve core (4), wherein the valve core (4) is arranged in the valve body (5), and one end of the valve core (4) extends out of the valve body (5) and is connected with the output end of the driving mechanism;
the feedback mechanism includes: the feedback valve comprises a feedback threaded sleeve (9), a bearing and a ball screw shaft (13), wherein one end of the feedback threaded sleeve (9) is in threaded connection with the other end of the valve core (4), and the other end of the feedback threaded sleeve is connected with the ball screw shaft (13); the inner ring of the bearing is fixed with the feedback threaded sleeve (9), and the outer ring of the bearing is in transition fit with the valve body (5);
the cylinder barrel includes: the cylinder comprises a front cylinder barrel (19) and a rear cylinder barrel (16), wherein a front end cover (25) and a rear end cover (18) are respectively installed at two ends of the front cylinder barrel (19), and the rear end cover (18) is fixed with the rear cylinder barrel (16); the other end of the rear cylinder barrel (16) is fixedly installed with the valve body (5);
the double-out-rod piston rod comprises: a piston (20), a rear piston rod (17), and a front piston rod (22), the piston (20) being slidable within the front cylinder (19); one end of the rear piston rod (17) is provided with an external thread and screwed in the piston (20), the other end of the rear piston rod is hollow, a screw nut (14) is installed in the rear piston rod through a screw nut installation seat (15), and a ball screw shaft (13) penetrates through the interior of the screw nut (14); the front piston rod (22) is screwed at the other end of the piston (20) through threads;
the hydraulic circuit includes: the hydraulic control valve is characterized by comprising a first hydraulic pipeline (23) and a second hydraulic pipeline (28) which are communicated with an oil channel (6) in the valve body (5), wherein the first hydraulic pipeline (23) and the second hydraulic pipeline (28) are positioned on the outer sides of the front cylinder barrel (19) and the rear cylinder barrel (16), the first hydraulic pipeline (23) is communicated with a cavity in the front cylinder barrel (19) close to one side of the front end cover (25), and the second hydraulic pipeline (28) is communicated with a cavity in the front cylinder barrel (19) close to one side of the rear end cover (18).
2. The symmetric digital hydraulic cylinder according to claim 1, wherein the driving mechanism comprises a stepping motor (1), a flange (2) and a motor coupler (3), the stepping motor (1) is fixed on the valve body (5) through the flange (2), an output shaft is connected with the motor coupler (3), and two symmetric grooves are axially formed in the motor coupler (3) and are connected with the valve core (4) in a shifting fork manner.
3. A symmetric digital hydraulic cylinder according to claim 2, characterized in that the valve core (4) is a non-full-circumference open valve and one end of the valve core (4) is chamfered.
4. A symmetric digital hydraulic cylinder according to claim 3, characterized in that the bearings comprise a first bearing and a second bearing, the first bearing (8) and the second bearing (10) are both angular contact bearings, the outer diameter of the first bearing (8) is smaller than the outer diameter of the second bearing (10), and a bearing cover (11) is fixedly mounted on the outer side of the second bearing (10).
5. The symmetric digital hydraulic cylinder according to claim 4, wherein an external thread is formed at one end of the valve core (4) close to the feedback threaded sleeve (9), and an internal thread matched with the external thread is arranged on the inner side of the feedback threaded sleeve (9).
6. A symmetric digital hydraulic cylinder according to claim 5, characterized in that said rear piston rod (17) is provided with small holes along the radial direction.
7. A symmetric digital hydraulic cylinder according to claim 6, characterized in that the cylinder barrel further comprises a front foot rest (26) and a rear foot rest (29), the front foot rest (26) is mounted on the front end cover (25), the rear foot rest (29) is mounted on the valve body (5), and both the front foot rest (26) and the rear foot rest (29) are mounted on the test bench by bolts.
8. A symmetric digital hydraulic cylinder according to claim 7, characterized in that a first pipe connection (7) is arranged between the first hydraulic line (23) and the valve body (5), a second pipe connection (24) is arranged between the first hydraulic line (23) and the right chamber of the cylinder, and a third pipe connection (27) is arranged between the second hydraulic line (28) and the left chamber of the cylinder.
9. A symmetric digital hydraulic cylinder according to claim 8, characterized in that a sealing ring (21) is arranged between the front cylinder tube (19) and the piston (20).
10. A symmetric digital hydraulic cylinder according to claim 9, characterized in that the feedback nut (9) is fixedly connected to the ball screw shaft (13) by means of a pin (12).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911185257.8A CN111043099B (en) | 2019-11-27 | 2019-11-27 | Symmetrical digital hydraulic cylinder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911185257.8A CN111043099B (en) | 2019-11-27 | 2019-11-27 | Symmetrical digital hydraulic cylinder |
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| CN111043099A CN111043099A (en) | 2020-04-21 |
| CN111043099B true CN111043099B (en) | 2021-08-03 |
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| EP4147947A4 (en) * | 2020-05-06 | 2024-02-14 | Xuzhou Heavy Machinery Co., Ltd. | Hydraulic steering system and mobile crane |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6989646B2 (en) * | 2002-04-29 | 2006-01-24 | Stuart Pollard Jackson | Multi-axis air/electrical control system |
| JP2007333122A (en) * | 2006-06-16 | 2007-12-27 | Kayaba Ind Co Ltd | Hydraulic cylinder |
| CN102094869A (en) * | 2011-03-04 | 2011-06-15 | 江苏科技大学 | Two-degree-of-freedom hydraulic oil cylinder |
| CN202001424U (en) * | 2011-03-24 | 2011-10-05 | 大连万讯电力仪表有限公司 | Forced grease lubrication straight stroke cylinder with adjustable stroke |
| CN103148047B (en) * | 2013-03-21 | 2016-03-02 | 肖志权 | A kind of internal feedback digital servo hydraulic cylinder |
| CN203784007U (en) * | 2014-04-04 | 2014-08-20 | 王军 | Single piston rod symmetric digital servo hydraulic cylinder |
| CN106704312A (en) * | 2015-11-17 | 2017-05-24 | 北京航空航天大学 | Digital hydraulic cylinder with novel feedback mechanism |
| CN106194882A (en) * | 2016-07-08 | 2016-12-07 | 彭东林 | A kind of Numeric hydraulic cylinder |
| CN206175350U (en) * | 2016-11-08 | 2017-05-17 | 广州市建筑材料工业研究所有限公司 | A synchronous hydraulic thrust device for building be out of shape performance between curtain layer and detect |
| CN106884827A (en) * | 2017-03-22 | 2017-06-23 | 燕山大学 | A kind of valve element Direct Action Type Numeric hydraulic cylinder |
| CN207043817U (en) * | 2017-08-09 | 2018-02-27 | 浙江合信数控机床股份有限公司 | A kind of cylinder on Digit Control Machine Tool |
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