CN116006543A - Digital hydraulic cylinder - Google Patents
Digital hydraulic cylinder Download PDFInfo
- Publication number
- CN116006543A CN116006543A CN202310139599.6A CN202310139599A CN116006543A CN 116006543 A CN116006543 A CN 116006543A CN 202310139599 A CN202310139599 A CN 202310139599A CN 116006543 A CN116006543 A CN 116006543A
- Authority
- CN
- China
- Prior art keywords
- valve
- cavity
- valve core
- hydraulic cylinder
- channel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The digital hydraulic cylinder of the present invention includes: the hydraulic cylinder comprises a cylinder body, a piston and a piston rod, wherein the piston is arranged in the cylinder body and divides the cavity of the cylinder body into a first cavity and a second cavity; the reversing valve comprises a valve body and a valve core, the valve body is provided with a first channel and a second channel, and the valve core is movably arranged in the valve body; the output shaft of the motor is connected with the valve core and can drive the valve core to rotate; the first cavity is communicated with the first channel through the first hydraulic pipeline, and the second cavity is communicated with the second channel through the second hydraulic pipeline; and the feedback assembly is positioned outside the first cavity and the second cavity, and the piston rod is connected with the valve core through the feedback assembly. The digital hydraulic cylinder according to the invention thus has the advantages of ease of manufacture, low cost and reliable operation.
Description
Technical Field
The invention relates to the technical field of hydraulic cylinders, in particular to a digital hydraulic cylinder.
Background
A hydraulic cylinder is an end effector that performs a straight reciprocating motion by converting pressure energy of a fluid into mechanical energy. The digital hydraulic cylinder consists of a numerical control device, a stepping motor and a cylinder body with a control valve, and the control valve is used for controlling the start, stop and movement direction of the piston of the cylinder body. The basic working principle of the digital hydraulic cylinder is that pulse sequence signals are sent out to drive a stepping motor to move, a digital valve is opened, and then the hydraulic cylinder is driven to move. In the mechanical feedback type digital hydraulic cylinder, the movement of a piston is fed back to a control valve through a feedback rod in threaded connection with the piston, so that an automatic adjusting internal position closed loop and a speed closed loop are formed. In the related art, the digital hydraulic cylinder feeds back by means of the ball screw, the ball screw feed back structure extends into the piston rod from the rodless cavity and is completely positioned in a medium, the requirements on the medium and lubrication are high, and the axial back pressure is large; meanwhile, the rotary seal is required to be isolated from the outside, and the processing precision requirement is high.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. To this end, an embodiment of the present invention proposes a digital hydraulic cylinder.
The digital hydraulic cylinder of the embodiment of the invention comprises:
the hydraulic cylinder comprises a cylinder body, a piston and a piston rod, wherein the piston is arranged in the cylinder body and divides the cavity of the cylinder body into a first cavity and a second cavity, the first end part of the piston rod stretches into the first cavity and is connected with the piston, the second end part of the piston rod is positioned outside the cylinder body, and the first end part of the piston rod and the piston are movably arranged in the cylinder body along a first direction;
the reversing valve comprises a valve body and a valve core, wherein the valve body is provided with a first channel and a second channel, and the valve core is movably arranged in the valve body;
the output shaft of the motor is connected with the valve core and can drive the valve core to rotate;
the first cavity is communicated with the first channel through the first hydraulic pipeline, and the second cavity is communicated with the second channel through the second hydraulic pipeline;
the feedback assembly is positioned at the outer sides of the first cavity and the second cavity, the piston rod is connected with the valve core through the feedback assembly, the feedback assembly can drive the valve core to move from an initial position in the axial direction of the reversing valve in the process of driving the valve core to rotate by the motor, and the feedback assembly can drive the valve core to return to the initial position in the axial direction of the reversing valve in the process of moving the piston rod along the first direction.
Therefore, the digital hydraulic cylinder according to the embodiment of the invention has the advantages of convenience in manufacturing, low cost and reliable operation.
In some embodiments, the feedback assembly includes a lead screw having a third end connected to the valve spool, the lead screw in lead screw drive with the second end of the piston rod.
In some embodiments, a third cavity facing the valve core is provided at the second end of the piston rod, the extension directions of the piston rod, the screw rod and the third cavity are all the first direction, a plunger nut is provided in the third cavity, the fourth end of the screw rod extends into the third cavity, and the screw rod is in threaded connection with the plunger nut.
In some embodiments, the feedback assembly further comprises
A connecting frame;
the transmission shaft extends along the first direction, the transmission shaft is rotatably arranged on the connecting frame, the fifth end part of the transmission shaft is in threaded connection with the valve core, the sixth end part of the transmission shaft is fixedly connected with the third end part of the screw rod, and the axial center position of the valve core, the axial center position of the transmission shaft and the axial center position of the screw rod are the same.
In some embodiments, the valve body, the connecting frame, and the cylinder are sequentially connected in the first direction.
In some embodiments, the cylinder body comprises an end cover, a cylinder barrel and a bottom cover, wherein the end cover is connected with the cylinder barrel through a fastener, the bottom cover is connected with the cylinder barrel in a welded mode, the connecting frame is connected with the valve body through a fastener, the connecting frame is connected with the end cover and the bottom cover through a plurality of long bolts, and the extending direction of the long bolts is the first direction.
In some embodiments, a thread head is disposed on the valve core, a transmission nut is disposed on the fifth end of the transmission shaft, and the thread head is in threaded connection with the transmission nut.
In some embodiments, the valve body has a valve cavity, a liquid inlet passage, and a liquid outlet passage, the valve cavity extending in the first direction, the first passage, the second passage, the liquid inlet passage, and the liquid outlet passage all communicating with the valve cavity;
the reversing valve comprises a first sealing element, the first sealing element is annular and is positioned in the valve cavity, the first sealing element is annularly arranged on the outer peripheral side of the valve core and is abutted to the wall surface of the valve cavity, and the first sealing element adjacent to the first sealing element is arranged on two sides of the first channel, the second channel, the liquid inlet channel and the liquid outlet channel in the first direction.
In some embodiments, the valve core has a fourth cavity, a fifth cavity, a plurality of first through holes, a plurality of second through holes, a plurality of third through holes, and a plurality of fourth through holes, the fourth cavity being disposed in spaced relation to the fifth cavity, the plurality of first through holes and the plurality of second through holes being disposed in spaced relation circumferentially on the valve core and in communication with the fourth cavity, the plurality of third through holes and the plurality of fourth through holes being disposed in spaced relation circumferentially on the valve core and in communication with the fifth cavity;
the reversing valve further comprises a second sealing piece, the second sealing piece is annular, the second sealing piece is annularly arranged on the outer peripheral side of the valve core and is in butt joint with the outer peripheral surface of the valve core, and the second sealing piece adjacent to the first through hole, the second through hole, the third through hole and the fourth through hole are arranged on two sides of the first direction.
In some embodiments, the reversing valve further includes a valve housing having a ring shape and extending in the first direction, the valve housing being disposed in the valve cavity, the valve spool being movably disposed in the valve housing, the valve housing having a plurality of valve housing through holes, an outer circumferential surface of the valve housing having a first annular groove, the first seal being disposed in the first annular groove, an inner wall surface of the valve housing having a second annular groove, the second seal being disposed in the second annular groove, each of the valve housing through holes having the first annular groove and the second annular groove adjacent thereto on both sides in the first direction.
Drawings
Fig. 1 is a schematic diagram of a digital hydraulic cylinder according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a reversing valve according to an embodiment of the invention.
Reference numerals:
a digital hydraulic cylinder 100;
the hydraulic cylinder 1, the cylinder body 11, the end cover 111, the cylinder tube 112, the bottom cover 113, the piston 12, the piston rod 13, the first end 131, the second end 132, the first cavity 14, the second cavity 15, the third cavity 16 and the plunger nut 17;
the reversing valve 2, the valve body 21, the valve cavity 211, the liquid inlet channel 212, the liquid outlet channel 213, the first channel 214, the second channel 215, the valve core 22, the fourth cavity 221, the fifth cavity 222, the first through hole 223, the second through hole 224, the third through hole 225, the fourth through hole 226, the screw head 227, the first sealing element 23, the second sealing element 24, the valve sleeve 25, the valve sleeve through hole 251, the first annular groove 252, and the second annular groove 253;
a motor 3;
a first hydraulic line 41, a second hydraulic line 42;
a screw 5, a third end 51, a fourth end 52;
a connecting frame 6, a long bolt 61;
a drive shaft 7, a fifth end 71, a sixth end 72, a drive nut 73.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
A digital hydraulic cylinder 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings. As shown in fig. 1 and 2, a digital hydraulic cylinder 100 according to an embodiment of the present invention includes a hydraulic cylinder 1, a directional valve 2, a motor 3, a first hydraulic line 41, a second hydraulic line 42, and a feedback assembly.
The hydraulic cylinder 1 includes a cylinder body 11, a piston 12, and a piston rod 13. The piston 12 is provided in the cylinder 11 and divides the cavity of the cylinder 11 into a first cavity 14 and a second cavity 15. The first end 131 of the piston rod 13 extends into the first chamber 14 and is connected to the piston 12, and the second end 132 of the piston rod 13 is located outside the cylinder 11. The first end 131 of the piston rod 13 and the piston 12 are movably arranged in the cylinder 11 in a first direction.
The reversing valve 2 includes a valve body 21 and a spool 22, the valve body 21 having a first passage 214 and a second passage 215, the spool 22 being movably provided in the valve body 21 so as to open and close a corresponding one of the first passage 214 and the second passage 215. An output shaft of the motor 3 is connected with the valve core 22 and can drive the valve core 22 to rotate. The first chamber 14 and the first passage 214 communicate through the first hydraulic line 41, and the second chamber 15 and the second passage 215 communicate through the second hydraulic line 42.
The feedback assembly is located outside the first cavity 14 and the second cavity 15, and the piston rod 13 is connected to the valve core 22 through the feedback assembly. During the process that the motor 3 drives the valve core 22 to rotate, the feedback component can drive the valve core 22 to move from the initial position in the axial direction of the reversing valve 2. During the movement of the piston rod 13 in the first direction, the feedback assembly may drive the spool 22 back to the initial position in the axial direction of the reversing valve 2.
The valve body 21 of the digital hydraulic cylinder 100 according to the embodiment of the present invention has a first passage 214 and a second passage 215, and the spool 22 is movably (rotatably and slidably) provided in the valve body 21. When the spool 22 starts to move from the initial position in the axial direction of the direction valve 2, one of the first passage 214 and the second passage 215 may be opened, so that high-pressure liquid may be introduced into the corresponding one of the first chamber 14 and the second chamber 15 to drive the piston 12 and the piston rod 13 to move in the first direction.
During the process that the motor 3 drives the valve core 22 to rotate, the feedback component can drive the valve core 22 to move from the initial position in the axial direction of the reversing valve 2. So that high pressure liquid can be introduced into one of the first and second chambers 14, 15 and drive the piston 12 and piston rod 13 to move in the first direction, i.e. the motor 3 and feedback assembly cooperate with the valve spool 22 such that high pressure liquid is introduced into the hydraulic cylinder 1 to drive the hydraulic cylinder 1 to move.
During the movement of the piston rod 13 in the first direction, the feedback assembly may drive the spool 22 back to the initial position in the axial direction of the reversing valve 2. When the piston rod 13 moves along the first direction, the piston rod 13 can drive at least part of the feedback assembly to move and feed back the rotary valve core 22, and during the movement of the piston rod 13, the feedback assembly can drive the valve core 22 to return to the initial position in the axial direction of the reversing valve 2, so that the high-pressure liquid stops flowing into the corresponding one of the first cavity 14 and the second cavity 15, and the piston rod 13 stops moving.
That is, when the spool 22 rotates from the initial position, the feedback assembly may drive the spool 22 to move in the axial direction thereof, and allow high-pressure fluid to pass into the hydraulic cylinder 1 and drive the piston rod 13 to move. When the piston rod 13 moves, the feedback assembly can be driven to move, so that the feedback assembly drives the valve core 22 to reset (return to the initial position), and the piston rod 13 stops moving.
The feedback assembly is located outside the first cavity 14 and the second cavity 15, that is, all the parts in the feedback assembly are located outside the first cavity 14 and the second cavity 15, so that all the parts in the feedback assembly are not contacted with the medium (high-pressure liquid) in the first cavity 14 and the second cavity 15, and further, a sealing element matched with the feedback assembly is not required to be arranged on the hydraulic cylinder 1. And the liquid media introduced into the first cavity 14 and the second cavity 15 do not need to consider the material of the feedback component, so that the digital hydraulic cylinder 100 according to the embodiment of the invention is not easy to leak high-pressure media, has low sealing requirements, less limitation on media and lower processing precision requirements, and is low in cost, convenient to manufacture and more reliable in operation.
Accordingly, the digital hydraulic cylinder 100 according to the embodiment of the present invention has advantages of convenience in manufacturing, low cost, and reliable operation.
As shown in fig. 1 and 2, a digital hydraulic cylinder 100 according to an embodiment of the present invention includes a hydraulic cylinder 1, a directional valve 2, a motor 3, a first hydraulic line 41, a second hydraulic line 42, and a feedback assembly.
The hydraulic cylinder 1 includes a cylinder body 11, a piston 12, and a piston rod 13. The piston 12 is provided in the cylinder 11 and divides the cavity of the cylinder 11 into a first cavity 14 and a second cavity 15. The first end 131 of the piston rod 13 extends into the first chamber 14 and is connected to the piston 12, and the second end 132 of the piston rod 13 is located outside the cylinder 11. The first end 131 of the piston rod 13 and the piston 12 are movably arranged in the cylinder 11 in a first direction. Specifically, the cylinder 11 includes an end cover 111, a cylinder 112, and a bottom cover 113, the end cover 111 is connected to the cylinder 112 by fasteners, and the bottom cover 113 is welded to the cylinder 112. The first end 131 of the piston rod 13 passes through the end cap 111 and protrudes into the first cavity 14. The first direction may be a left-right direction, which is indicated by an arrow in the figure. For example, the end cover 111, the cylinder tube 112, and the bottom cover 113 are disposed in this order from left to right. The first cavity 14 is located to the left of the second cavity 15. The first end 131 of the piston rod 13 is the right end thereof, and the second end 132 of the piston rod 13 is the left end thereof.
As shown in fig. 1 and 2, the reversing valve 2 includes a valve body 21, a spool 22, a first seal 23, a second seal 24, and a valve housing 25. The axial direction of the reversing valve 2 is the first direction. For example, the axial direction of the reversing valve 2 is the right-left direction.
The valve body 21 has a valve cavity 211, a liquid inlet passage 212, a liquid discharge passage 213, a first passage 214, and a second passage 215, the valve cavity 211 extending in the first direction, the first passage 214, the second passage 215, the liquid inlet passage 212, and the liquid discharge passage 213 all communicating with the valve cavity 211. Specifically, the liquid inlet channel 212 is used for introducing high-pressure liquid, and the liquid outlet channel 213 is used for discharging high-pressure liquid. For example, the valve chamber 211 extends in the left-right direction, and the first passage 214, the second passage 215, the liquid intake passage 212, and the liquid discharge passage 213 each extend in the radial direction of the valve chamber 211.
The first chamber 14 and the first passage 214 communicate through the first hydraulic line 41, and the second chamber 15 and the second passage 215 communicate through the second hydraulic line 42. That is, the high pressure liquid may sequentially pass through the first passage 214 and the first hydraulic line 41 into the first chamber 14, and the high pressure liquid may sequentially pass through the second passage 215 and the second hydraulic line 42 into the second chamber 15.
The spool 22 is movably provided in the valve body 21. Specifically, the spool 22 is slidably and rotatably provided in the valve chamber 211. Thereby, the spool 22 can be made movable in the axial direction thereof when rotating in the valve body 21. For example, the axial direction of the valve body 22 is the left-right direction (first direction), and the right end portion of the valve body 22 extends out of the valve body 21.
An output shaft of the motor 3 is connected with the valve core 22 and can drive the valve core 22 to rotate. For example, the motor 3 is a stepping motor or a servo motor, and the valve core 22 is driven to rotate by the stepping motor or the servo motor so as to control on-off of the first hydraulic pipeline 41 and the second hydraulic pipeline 42, which is beneficial to realizing the digitization of the hydraulic system. The output shaft of the motor 3 is connected with the groove body at the left end of the valve core 22 through a sliding key, so that the valve core 22 can still drive the valve core 22 to rotate when the valve core 22 moves in the axial direction.
As shown in fig. 1 and 2, in some embodiments, the spool 22 has a fourth cavity 221, a fifth cavity 222, a plurality of first through holes 223, a plurality of second through holes 224, a plurality of third through holes 225, and a plurality of fourth through holes 226. The fourth cavity 221 is disposed at intervals from the fifth cavity 222, a plurality of first through holes 223 and a plurality of second through holes 224 are disposed on the spool 22 at intervals in the circumferential direction (of the spool 22) and communicate with the fourth cavity 221, and a plurality of third through holes 225 and a plurality of fourth through holes 226 are disposed on the spool 22 at intervals in the circumferential direction (of the spool 22) and communicate with the fifth cavity 222. For example, the fourth chamber 221 is located on the left side of the fifth chamber 222, and the first through hole 223, the second through hole 224, the third through hole 225, and the fourth through hole 226 are opened on the outer peripheral surface of the spool 22 and are provided in order from left to right.
The valve sleeve 25 is annular and extends in a first direction, the valve sleeve 25 is disposed within the valve cavity 211, and the valve spool 22 is movably disposed within the valve sleeve 25. Specifically, the valve core 22 is rotatable and slidable within the valve housing 25. Thereby, the spool 22 can be facilitated to rotate relative to the valve sleeve 25 and to move in the first direction.
The valve housing 25 has a plurality of housing through holes 251. A plurality of valve housing through holes 251 extend through the valve housing 25 and communicate with the cavity within the valve housing 25. The valve housing through bore 251 facilitates the passage of liquid through the valve housing 25.
Specifically, the reversing valve 2 is a three-position four-way valve, and when the spool 22 is in the neutral position (initial position), the ports (T port, P port, a port, and B port) are not communicated. During the rotation of the valve core 22, the feedback assembly drives the valve core 22 to move from the initial position (rightward) in the first direction, so that the liquid inlet channel 212 (P port) is sequentially communicated with the second cavity 15 through the valve sleeve through hole 251, the second through hole 224, the fourth cavity 221, the first through hole 223, the valve sleeve through hole 251, the second channel 215 (B port) and the second hydraulic pipeline 42, and the liquid discharge channel 213 (T port) is sequentially communicated with the first cavity 14 through the valve sleeve through hole 251, the fourth through hole 226, the fifth cavity 222, the third through hole 225, the valve sleeve through hole 251, the first channel 214 (a port) and the first hydraulic pipeline 41; or, during the rotation of the valve core 22, the feedback assembly drives the valve core 22 to move from the initial position (leftwards) in the first direction, so that the liquid inlet channel 212 (P) is sequentially communicated with the first cavity 14 through the valve sleeve through hole 251, the third through hole 225, the fifth cavity 222, the fourth through hole 226, the valve sleeve through hole 251, the first channel 214 (a port) and the first hydraulic pipeline 41, and the liquid drain channel 213 (T) is sequentially communicated with the second cavity 15 through the valve sleeve through hole 251, the first through hole 223, the fourth cavity 221, the second through hole 224, the valve sleeve through hole 251, the second channel 215 (B) and the second hydraulic pipeline 42.
As shown in fig. 1 and 2, the first seal member 23 is annular, and the first seal member 23 is located in the valve chamber 211. The first seal 23 is provided around the outer periphery of the valve body 22 (valve housing 25) and abuts against the wall surface of the valve chamber 211. The second seal 24 is annular, the second seal 24 is located in the valve chamber 211, and the second seal 24 is annularly provided on the outer peripheral side of the spool 22 and abuts against the outer peripheral surface of the spool 22. For example, the first seal 23 is an O-ring. The second seal 24 is a relatively low friction glain ring to facilitate control of the flow of the high pressure liquid.
Specifically, the outer circumferential surface of the valve housing 25 has a plurality of first annular grooves 252, the first seal 23 is located in the first annular grooves 252, the inner wall surface of the valve housing 25 has a plurality of second annular grooves 253, and the second seal 24 is located in the second annular grooves 253. Each valve sleeve through hole 251 has a first annular groove 252 and a second annular groove 253 adjacent thereto on both sides in the first direction, and each of the first through hole 223, the second through hole 224, the third through hole 225, and the fourth through hole 226 is provided with a second seal 24 adjacent thereto on both sides in the first direction, and the first passage 214, the second passage 215, the liquid inlet passage 212, and the liquid outlet passage 213 are provided with a first seal 23 adjacent thereto on both sides in the first direction. That is, the first seal 23 is located between the valve body 21 and the valve housing 25, the second seal 24 is located between the valve spool 22 and the valve housing 25, and each of the valve housing through hole 251, the first through hole 223, the second through hole 224, the third through hole 225, and the fourth through hole 226 is provided with the second seal 24 adjacent thereto on both sides in the first direction, and the valve housing through hole 251, the first passage 214, the second passage 215, the liquid intake passage 212, and the liquid discharge passage 213 are provided with the first seal 23 adjacent thereto on both sides in the first direction. Therefore, the hydraulic medium in each flow passage in the reversing valve 2 is not easy to leak, and the reversing valve is more suitable for high water-base occasions. So that the liquid medium passing into the first and second chambers 14, 15 can be high pressure water.
For example, each of the valve housing through-hole 251, the first through-hole 223, the second through-hole 224, the third through-hole 225, and the fourth through-hole 226 is provided with the second seal 24 adjacent thereto on both sides in the left-right direction, and each of the valve housing through-hole 251, the first passage 214, the second passage 215, the liquid intake passage 212, and the liquid discharge passage 213 is provided with the first seal 23 adjacent thereto on both sides in the left-right direction.
The feedback assembly is located outside the first cavity 14 and the second cavity 15, and the piston rod 13 is connected to the valve core 22 through the feedback assembly. During the process that the motor 3 drives the valve core 22 to rotate, the feedback component can drive the valve core 22 to move from the initial position in the axial direction of the reversing valve 2. During the movement of the piston rod 13 in the first direction, the feedback assembly may drive the spool 22 back to the initial position in the axial direction of the reversing valve 2. That is, the feedback component is separated from the liquid medium in a dry-wet manner, so that the dry operation of the feedback component is realized, and the influence of the liquid medium on the feedback component is overcome, so that the digital hydraulic cylinder 100 has high reliability and low processing precision requirement, the digital hydraulic cylinder 100 can be upgraded and digitized, and the digitized threshold is obviously reduced.
As shown in fig. 1 and 2, the feedback assembly includes a screw 5, a connecting frame 6, and a transmission shaft 7.
The screw 5 is in screw 5 drive with the second end 132 of the piston rod 13. Specifically, the second end 132 of the piston rod 13 is provided with a third cavity 16 facing the valve core 22, the extending directions of the piston rod 13, the screw rod 5 and the third cavity 16 are all the first direction, a plunger nut 17 is arranged in the third cavity 16, the fourth end 52 of the screw rod 5 extends into the third cavity 16, and the screw rod 5 is in threaded connection with the plunger nut 17. For example, the extension directions of the piston rod 13, the screw 5, and the third chamber 16 are all the left-right directions, the third end 51 (left end) of the screw 5 is connected to the valve element 22, the opening of the third chamber 16 is directed to the left, and the fourth end 52 (right end) of the screw 5 extends into the third chamber 16. The screw 5 is a ball screw.
The third end 51 of the screw 5 is connected to the spool 22. Specifically, the screw 5 is screwed with the spool 22 through the transmission shaft 7. The drive shaft 7 extends in a first direction, the drive shaft 7 being rotatably arranged on the connection frame 6. The fifth end 71 of the transmission shaft 7 is in threaded connection with the valve core 22, the sixth end 72 of the transmission shaft 7 is fixedly connected with the third end 51 of the screw 5, and the axial position of the valve core 22, the axial position of the transmission shaft 7 and the axial position of the screw 5 are the same. Thus, during rotation of the spool 22 by the motor 3, the threaded connection of the spool 22 with the drive shaft 7 enables the rotationally movable spool 22 to be moved in a first direction from the initial position. When the piston rod 13 moves in the first direction, the screw rod 5 and the transmission shaft 7 can be driven to rotate, so that the valve core 22 in threaded connection with the transmission shaft 7 is driven to rotate, and the valve core 22 moves to an initial position in the first direction, so that the valve core 22 is reset and high-pressure liquid is stopped from being introduced into a corresponding one of the first cavity 14 and the second cavity 15.
As shown in fig. 1 and 2, in some embodiments, the spool 22 is provided with a threaded head 227, and the fifth end 71 of the drive shaft 7 is provided with a drive nut 73, the threaded head 227 being threadably connected to the drive nut 73. Thereby, the fifth end 71 of the drive shaft 7 can be screwed with the spool 22. Specifically, the transmission shaft 7 is connected with the screw rod 5 (the piston rod 13), so that the load of the transmission shaft 7 is large, the valve core 22 cannot drive the transmission shaft 7 to rotate when the valve core 22 rotates, and the valve core 22 can be driven to rotate when the transmission shaft 7 rotates. When the motor 3 rotates the spool 22, the spool 22 screwed with the transmission shaft 7 rotates and moves in the first direction (at this time, the transmission shaft 7 does not move). In the feedback stage, the screw rod 5 drives the transmission shaft 7 and the transmission nut 73 to rotate, and the rotation speed of the valve core 22 driven by the motor 3 is inconsistent with (different from) the rotation speed of the transmission nut 73, so that the transmission shaft 7 can drive the valve core 22 to rotate and move towards the initial position in the first direction, that is, the valve core 22 moves to the middle position, and the valve ports (the port T, the port P, the port A and the port B) are not communicated. For example, the right end portion of the spool 22 is provided with a screw head 227, and the fifth end portion 71 (left end portion) of the drive shaft 7 is provided with a drive nut 73.
For example, the motor 3 inputs a command to rotate clockwise, the output shaft of the motor 3 drives the valve core 22 of the reversing valve 2 to rotate through the sliding key, the right end of the valve core 22 is in threaded connection with the fifth end 71 of the transmission shaft 7, so that the valve core 22 moves axially (in a first direction) when the valve core 22 rotates, at this time, the liquid inlet channel 212 (P port) is communicated with the second channel 215 (B port), high-pressure liquid enters the second cavity 15 of the hydraulic cylinder 1, the first cavity 14 of the hydraulic cylinder 1 is communicated with the first channel 214 (a port) of the reversing valve 2, liquid returns through the liquid outlet channel 213 (T port) of the reversing valve 2, so that the piston rod 13 moves and stretches out (leftwards), the plunger nut 17 moves in a first direction (leftwards), the screw rod 5 is driven to rotate, the transmission shaft 7 is driven to rotate by the screw rod 5, the rotating motion is converted into the axial (in the first direction) of the valve core 22 through the thread pair (the thread head 227 and the transmission nut 73), the valve core 22 moves towards the initial position, and the valve core 22 resets, so as to form a closed loop system based on the screw rod 5 feedback.
When a command is input by a motor to rotate anticlockwise, the valve core 22 moves axially in the opposite direction, at the moment, the liquid inlet channel 212 (P port) is communicated with the first channel 214 (A port), high-pressure liquid enters the first cavity 14 of the hydraulic cylinder 1, the second cavity 15 of the hydraulic cylinder 1 is communicated with the second channel 215 (B port), liquid returns through the liquid outlet channel 213 (T port) of the reversing valve 2, at the moment, the piston rod 13 (rightwards) moves and contracts, the plunger nut 17 moves rightwards in the first direction to drive the screw rod 5 to rotate, the screw rod 5 drives the transmission shaft 7 to rotate, and then the rotating motion is converted into axial (first direction) movement of the valve core 22 through a thread pair (a thread head 227 and a transmission nut 73), the valve core 22 moves towards a closed position, and the valve core 22 resets to form a closed loop system based on feedback of the screw rod 5.
In some embodiments, the connecting frame 6, the valve body 21, the connecting frame 6, and the cylinder 11 are sequentially connected in the first direction. Specifically, the connection frame 6 is connected to the valve body 21 by a fastener, the connection frame 6 is connected to the end cover 111 and the bottom cover 113 by a plurality of long bolts 61, and the extending direction of the long bolts 61 is the first direction. Thus, the entire digital hydraulic cylinder 100 can be made stable. For example, the valve body 21, the connecting frame 6, and the cylinder 11 are connected in this order from left to right. The connecting frame 6 is connected with the valve body 21 through bolts, the connecting frame 6 is connected with the end cover 111 and the bottom cover 113 through four long bolts 61, the extending direction of the long bolts 61 is the left-right direction, and the four long bolts 61 are arranged at intervals along the circumferential direction.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While the above embodiments have been shown and described, it should be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives, and variations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the invention.
Claims (10)
1. A digital hydraulic cylinder, comprising:
the hydraulic cylinder comprises a cylinder body, a piston and a piston rod, wherein the piston is arranged in the cylinder body and divides the cavity of the cylinder body into a first cavity and a second cavity, the first end part of the piston rod stretches into the first cavity and is connected with the piston, the second end part of the piston rod is positioned outside the cylinder body, and the first end part of the piston rod and the piston are movably arranged in the cylinder body along a first direction;
the reversing valve comprises a valve body and a valve core, wherein the valve body is provided with a first channel and a second channel, and the valve core is movably arranged in the valve body;
the output shaft of the motor is connected with the valve core and can drive the valve core to rotate;
the first cavity is communicated with the first channel through the first hydraulic pipeline, and the second cavity is communicated with the second channel through the second hydraulic pipeline;
the feedback assembly is positioned at the outer sides of the first cavity and the second cavity, the piston rod is connected with the valve core through the feedback assembly, the feedback assembly can drive the valve core to move from an initial position in the axial direction of the reversing valve in the process of driving the valve core to rotate by the motor, and the feedback assembly can drive the valve core to return to the initial position in the axial direction of the reversing valve in the process of moving the piston rod along the first direction.
2. The digital hydraulic cylinder of claim 1, wherein the feedback assembly includes a lead screw having a third end connected to the spool, the lead screw in lead screw drive with the second end of the piston rod.
3. The digital hydraulic cylinder according to claim 2, wherein,
the second end of the piston rod is provided with a third cavity facing the valve core, the extension directions of the piston rod, the screw rod and the third cavity are all in the first direction, a plunger nut is arranged in the third cavity, the fourth end of the screw rod stretches into the third cavity, and the screw rod is in threaded connection with the plunger nut.
4. The digital hydraulic cylinder of claim 2, wherein the feedback assembly further comprises
A connecting frame;
the transmission shaft extends along the first direction, the transmission shaft is rotatably arranged on the connecting frame, the fifth end part of the transmission shaft is in threaded connection with the valve core, the sixth end part of the transmission shaft is fixedly connected with the third end part of the screw rod, and the axial center position of the valve core, the axial center position of the transmission shaft and the axial center position of the screw rod are the same.
5. The digital hydraulic cylinder of claim 4, wherein the valve body, the connecting frame, and the cylinder body are sequentially connected in the first direction.
6. The digital hydraulic cylinder of claim 5, wherein the cylinder body comprises an end cover, a cylinder barrel and a bottom cover, the end cover is connected with the cylinder barrel through a fastener, the bottom cover is connected with the cylinder barrel in a welded mode, the connecting frame is connected with the valve body through a fastener, the connecting frame is connected with the end cover and the bottom cover through a plurality of long bolts, and the extending direction of the long bolts is the first direction.
7. The digital hydraulic cylinder according to claim 4, wherein a threaded head is provided on the valve spool, the fifth end of the drive shaft is provided with a drive nut, and the threaded head is in threaded connection with the drive nut.
8. A digital hydraulic cylinder according to any one of claims 1 to 7, wherein,
the valve body is provided with a valve cavity, a liquid inlet channel and a liquid outlet channel, the valve cavity extends along the first direction, and the first channel, the second channel, the liquid inlet channel and the liquid outlet channel are all communicated with the valve cavity;
the reversing valve comprises a first sealing element, the first sealing element is annular and is positioned in the valve cavity, the first sealing element is annularly arranged on the outer peripheral side of the valve core and is abutted to the wall surface of the valve cavity, and the first sealing element adjacent to the first sealing element is arranged on two sides of the first channel, the second channel, the liquid inlet channel and the liquid outlet channel in the first direction.
9. The digital hydraulic cylinder of claim 8, wherein the digital hydraulic cylinder is configured to,
the valve core is provided with a fourth cavity, a fifth cavity, a plurality of first through holes, a plurality of second through holes, a plurality of third through holes and a plurality of fourth through holes, the fourth cavity is arranged at intervals with the fifth cavity, the plurality of first through holes and the plurality of second through holes are arranged on the valve core at intervals along the circumferential direction and are communicated with the fourth cavity, and the plurality of third through holes and the plurality of fourth through holes are arranged on the valve core at intervals along the circumferential direction and are communicated with the fifth cavity;
the reversing valve further comprises a second sealing piece, the second sealing piece is annular, the second sealing piece is annularly arranged on the outer peripheral side of the valve core and is in butt joint with the outer peripheral surface of the valve core, and the second sealing piece adjacent to the first through hole, the second through hole, the third through hole and the fourth through hole are arranged on two sides of the first direction.
10. The digital hydraulic cylinder of claim 9, wherein the reversing valve further comprises a valve housing having a ring shape and extending in the first direction, the valve housing being disposed in the valve chamber, the valve spool being movably disposed in the valve housing, the valve housing having a plurality of valve housing through holes, an outer peripheral surface of the valve housing having a first annular groove, the first seal being disposed in the first annular groove, an inner wall surface of the valve housing having a second annular groove, the second seal being disposed in the second annular groove, each of the valve housing through holes having the first annular groove and the second annular groove adjacent thereto on both sides in the first direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310139599.6A CN116006543A (en) | 2023-02-07 | 2023-02-07 | Digital hydraulic cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310139599.6A CN116006543A (en) | 2023-02-07 | 2023-02-07 | Digital hydraulic cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116006543A true CN116006543A (en) | 2023-04-25 |
Family
ID=86019485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310139599.6A Pending CN116006543A (en) | 2023-02-07 | 2023-02-07 | Digital hydraulic cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116006543A (en) |
-
2023
- 2023-02-07 CN CN202310139599.6A patent/CN116006543A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100333230B1 (en) | Mold Sealing Device for Injection Molding Machine | |
| US20120012768A1 (en) | Stepper motor operated balanced flow control valve | |
| CN105570525A (en) | Flow control valve having a motion conversion device | |
| CN102094869A (en) | Two-degree-of-freedom hydraulic oil cylinder | |
| US8591201B2 (en) | Hydraulically driven machine improvement | |
| CN108161982B (en) | Robot joint driver | |
| CN116006543A (en) | Digital hydraulic cylinder | |
| CN201963634U (en) | Two-degree-of-freedom hydraulic oil cylinder | |
| CN111503081A (en) | Electric proportional control hydraulic multi-way reversing valve and control method thereof | |
| US6431048B2 (en) | Combination actuator with speed variable mechanism | |
| CN103148262A (en) | Power assisted manual valve system | |
| CN211344103U (en) | Reversing throttle valve | |
| CN214367942U (en) | Large-drift-diameter servo water pressure throttling reversing valve | |
| US4753071A (en) | Self-powered rotating-cylinder type linear actuator utilizing rotation-generated centrifugal head for piston positioning | |
| CN212155303U (en) | Electric proportional control hydraulic multi-way reversing valve | |
| CN113819108A (en) | Digital spiral swing fluid cylinder | |
| CA2048901C (en) | Rotary servo actuator with internal valve | |
| EP2009283B1 (en) | Hydraulically driven machine improvement | |
| CN209083717U (en) | A kind of gas-electricity composite drive actuator | |
| CN112682377B (en) | Valve core, axial flow type regulating valve and axial flow type regulating valve system | |
| CN214367463U (en) | Hydraulic valve | |
| CN211951627U (en) | Pilot-operated proportional cartridge valve based on servo motor drive | |
| US4479514A (en) | Float positioning assembly for pilot operated valve | |
| CN116498623B (en) | High-precision control valve for moving cylinder | |
| CN215596042U (en) | Reversing valve with throttling notch |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |