Digital hydraulic cylinder

Abstract

The application discloses a digital hydraulic cylinder, which comprises a hydraulic cylinder body, a piston rod, a sensor assembly, a reversing valve and a container. The hydraulic cylinder body is provided with a first channel, and the piston rod is arranged in the first channel and can move in the first channel relative to the hydraulic cylinder body. The sensor assembly is arranged at one end of the piston rod and comprises a pull rope and a sensor body. One end of the pull rope is arranged on the sensor body, and the other end of the pull rope is connected with the piston rod. The piston rod moves in the first direction to drive the pull rope to move relative to the sensor body. The container is adapted to contain oil, and the reversing valve is connected with the container and the hydraulic cylinder body. The reversing valve comprises a valve body and a valve core. The valve body is provided with a valve cavity, and the valve core is arranged in the valve cavity and can rotate relative to the valve body in the first direction. The pull rope is connected with the valve core, so that the valve core can move in the first direction relative to the valve body. The digital hydraulic cylinder has the advantages of high reliability and strong operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of digital hydraulic technology, in particular to a digital hydraulic cylinder. BACKGROUND

[0002] The hydraulic cylinder is a terminal actuator for linear reciprocating motion by converting the pressure energy of fluid into mechanical energy. The traditional hydraulic cylinder needs to be combined with directional valves, pressure valves and flow valves to realize practical functions such as position control, speed control and direction control. However, the system structure of the traditional hydraulic cylinder is complex, the price is high, and the maintenance is inconvenient, which is not conducive to digitalization and intelligentization.

[0003] With the development of computer technology, the application field of digital technology has been continuously expanded. Germany first introduced a digital oil cylinder which uses trapezoidal spiral tooth top to control oil path switching and uses a stepping motor to drive the spiral rotation, thereby controlling the forward and backward movement of the oil cylinder. However, the digital hydraulic cylinder cannot achieve high speed, long stroke and low price, which is not conducive to the development of digitalization and intelligentization of digital hydraulic cylinders. SUMMARY

[0004] The present application aims to at least solve one of the technical problems in the related art. To this end, the embodiments of the present application propose a digital hydraulic cylinder, which has the advantages of high reliability and strong operation.

[0005] The digital hydraulic cylinder of the embodiments of the present application comprises: a hydraulic cylinder body extending along a first direction, the hydraulic cylinder body having a first channel extending along the extension direction of the hydraulic cylinder body; a piston rod arranged in the first channel, the piston rod being movable in the first channel relative to the hydraulic cylinder body along the first direction; a sensor assembly arranged at one end of the piston rod, the sensor assembly comprising a pull rope and a sensor body, one end of the pull rope being arranged on the sensor body, the other end of the pull rope being connected with the piston rod, the piston rod moving along the first direction to drive the pull rope to move relative to the sensor body; a reversing valve and a container, the container being adapted to contain oil, the reversing valve being connected with the container and the hydraulic cylinder body, the reversing valve comprising a valve body and a valve core, the valve body having a valve cavity, the valve core being arranged in the valve cavity and being rotatable relative to the valve body about the first direction, the valve core being connected with the sensor body, and the pull rope being connected with the valve core, so that the valve core is movable relative to the valve body along the first direction to adjust the oil supply amount of the container to the hydraulic cylinder body; a driving member connected with one end of the valve core, the driving member driving the valve core to rotate relative to the hydraulic cylinder body about the first direction.

[0006] The digital hydraulic cylinder of the embodiment of the present application, the driving member drives the valve core to rotate in the first direction in the valve cavity, the other end of the valve core is connected with the sensor body, so that the valve core can move in the first direction, the movement of the valve core in the first direction can control the amount of oil flowing into the hydraulic cylinder body from the container, so that the piston rod moves in the first direction, so that the other end of the pull rope moves in the first direction, the sensor body receives the signal generated by the pull rope and transmits it out, so as to realize the real-time monitoring of the digital hydraulic cylinder of the embodiment of the present application. Therefore, the driving member is used to realize the on-off control of the system loop of the digital hydraulic cylinder of the embodiment of the present application, which is beneficial to realize the digitization of the digital hydraulic cylinder system of the embodiment of the present application. The displacement of the pull rope is used to detect the digital hydraulic cylinder of the embodiment of the present application, which not only realizes digitization, reduces the threshold of digitization, has low processing requirement, and saves cost.

[0007] In some embodiments, the sensor assembly further comprises an inductor, a hub, an elastic member and a transmission shaft, the sensor body has a first chamber, the inductor, the hub, the elastic member and the transmission shaft are arranged in the third chamber, the transmission shaft can rotate relative to the sensor body in the first direction, the inductor is arranged at one end of the transmission shaft, the other end of the transmission shaft is connected with the other end of the valve core, the hub and the elastic member are arranged on the transmission shaft, one end of the pull rope is wound on the hub, the inductor can sense the movement of the pull rope, the pull rope moves in the first direction to drive the hub to rotate, so that the transmission shaft rotates in the first direction, so that the valve core moves in the first direction.

[0008] In some embodiments, the valve body has a second channel, a first port, a second port, a third port and a fourth port, the valve cavity and the second channel extend in the first direction and are arranged at intervals, the valve cavity penetrates through the valve body, the first port and the second port communicate the outer wall surface of the valve body and the valve cavity, the third port and the fourth port communicate the outer wall surface of the valve body, the second channel and the valve cavity; the valve core has a third channel and a fourth channel, the third channel and the fourth channel are arranged at intervals along the extension direction of the valve core, when the valve core moves in the direction away from the driving member, the third port, the fourth channel and the second port are communicated, the fourth port, the second channel, the third channel and the first port are communicated, when the piston rod moves in the direction close to the driving member, the valve core moves in the direction close to the driving member relative to the valve body, the third port, the third channel and the first port are communicated, the fourth port, the fourth channel and the second port are communicated, and the piston rod moves in the direction away from the driving member.

[0009] In some embodiments, the reversing valve further comprises a valve sleeve, the valve sleeve is arranged around the outer wall surface of the valve core, at least part of the inner wall surface of the valve sleeve is in contact with the outer wall surface of the valve core, and at least part of the outer wall surface of the valve sleeve is in contact with the inner wall surface of the valve cavity.

[0010] In some embodiments, the valve core further has a first valve port, a second valve port, a third valve port and a fourth valve port, the first valve port and the second valve port are arranged on the outer wall surface of the third channel and are spaced apart along the extension direction of the third channel, the first valve port and the second valve port are in communication with the third channel, and the third valve port and the fourth valve port are arranged on the outer wall surface of the fourth channel and are spaced apart along the extension direction of the fourth channel, the third valve port and the fourth valve port are in communication with the fourth channel.

[0011] In some embodiments, the valve sleeve has a communication hole, the communication hole is opened from the outer wall surface of the valve sleeve towards the inner wall surface of the valve sleeve, and the communication hole communicates the valve core and the valve body.

[0012] In some embodiments, the hydraulic cylinder body has a first chamber and a second chamber, the first chamber is located between the outer wall surface of the piston rod and the inner wall surface of the hydraulic cylinder body, the first chamber is adapted to be filled with oil, the second chamber is located between the end surface of one end of the piston rod and the inner wall surface of one end of the hydraulic cylinder body, and the second chamber is adapted to be filled with oil,

[0013] When the valve core moves towards the direction away from the driving member, the oil in the first chamber flows out through the third port, the fourth channel and the second port, the oil in the second chamber flows out through the first port, the third channel, the second channel and the fourth port, so that the piston rod moves relative to the hydraulic cylinder body towards the direction close to the driving member, thereby driving the other end of the pull rope to move towards the direction close to the sensor body,

[0014] When the valve core moves towards the direction close to the driving member, the oil in the first chamber flows out through the second port, the fourth channel and the fourth port, and the oil flows into the second chamber through the third port, the third channel and the first port, so that the piston rod moves relative to the hydraulic cylinder body towards the direction away from the driving member, thereby driving the other end of the pull rope to move towards the direction away from the sensor body.

[0015] In some embodiments, the digital hydraulic cylinder further comprises a guide, the piston rod has a fifth channel, the fifth channel is opened along the extension direction of the piston rod, the guide is arranged in the fifth channel, at least part of the guide is located in the second chamber, the guide has a through hole penetrating the guide along the extension direction of the guide, and the pull rope is arranged on the guide through the through hole to be isolated from the oil in the second chamber.

[0016] In some embodiments, the digital hydraulic cylinder further comprises a connecting assembly, the connecting assembly comprises a first part and a second part, at least part of the first part is connected to the spool near one end of the transmission shaft, the outer wall surface of the first part has external threads, the second part is connected to the other end of the transmission shaft, the second part has a mounting hole, the mounting hole is opened along the first direction, the inner wall surface of the mounting hole has internal threads, the first part is threadedly connected with the mounting hole, and the driving member drives the valve body to rotate around the first direction to drive the first part to move in the first direction in the mounting hole, so as to drive the spool to move in the first direction.

[0017] In some embodiments, the digital hydraulic cylinder further comprises a lifting lug, the lifting lug is arranged at the other end of the piston rod, at least part of the lifting lug is located in the fifth channel and connected to the other end of the pull rope. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram of a digital hydraulic cylinder according to an embodiment of the present application.

[0019] Figure 2 is a schematic diagram of a digital hydraulic cylinder according to an embodiment of the present application.

[0020] Figure 3 is a schematic diagram of a digital hydraulic cylinder according to an embodiment of the present application.

[0021] Figure 4 is a schematic diagram of a digital hydraulic cylinder according to an embodiment of the present application.

[0022] Figure 5 is a schematic diagram of a reversing valve of a digital hydraulic cylinder according to an embodiment of the present application.

[0023] Figure 6 is a schematic diagram of a valve sleeve of a digital hydraulic cylinder according to an embodiment of the present application.

[0024] Figure 7 is a schematic diagram of a sensor assembly of a digital hydraulic cylinder according to an embodiment of the present application.

[0025] Figure 8is a schematic view of another embodiment of a digital hydraulic cylinder according to an embodiment of the present application.

[0026] Figure 9 is a partial enlarged view of another embodiment of a digital hydraulic cylinder according to an embodiment of the present application.

[0027] Figure 10 is a schematic view of a valve block in another embodiment of a digital hydraulic cylinder according to an embodiment of the present application.

[0028] Fig. 1 hydraulic cylinder body; 11 first channel; 12 first chamber; 13 second chamber; 2 piston rod; 21 fifth channel; 3 sensor assembly; 31 pull rope; 32 sensor body; 321 third chamber; 322 first perforation; 323 second perforation; 324 first bearing; 325 second bearing; 33 inductor; 34 hub; 35 elastic member; 36 transmission shaft; 4 reversing valve; 41 valve body; 411 valve cavity; 412 second channel; 413 first port; 414 second port; 415 third port; 416 fourth port; 42 valve core; 421 third channel; 422 fourth channel; 423 first valve port; 424 second valve port; 425 third valve port; 426 fourth valve port; 43 valve sleeve; 431 communication hole; 5 driving member; 61 first end cover; 611 first hole; 62 second end cover; 621 second hole; 63 connecting frame; 64 transmission member; 71 first sealing member; 72 second sealing member; 73 first communication member; 74 second communication member; 75 guide member; 751 through hole; 76 connecting assembly; 761 first part; 762 second part; 7621 mounting hole; 8 lifting lug; 91 transmission assembly; 911 first gear; 912 connecting belt; 913 second gear; 92 valve block; 921 body; 922 first connecting port; 923 second connecting port; 924 third connecting port; 925 fourth connecting port. DETAILED DESCRIPTION

[0029] Embodiments of the present application are described in detail below with reference to examples illustrated in the accompanying drawings. The embodiments described below by way of example with reference to the accompanying drawings are illustrative and are not intended to limit the present application, which can be realized in various other forms.

[0030] As shown in Figures 1-10 , the digital hydraulic cylinder of the embodiment of the present application comprises a hydraulic cylinder body 1, a piston rod 2, a sensor assembly 3, a reversing valve 4, a container and a driving member 5. The hydraulic cylinder body 1 is along a first direction (such as the direction of arrow A in the figure) and the piston rod 2 is along a second direction (such as the direction of arrow B in the figure). The sensor assembly 3 is arranged on the piston rod 2. The reversing valve 4 is arranged on the hydraulic cylinder body 1. The container is arranged on the hydraulic cylinder body 1. The driving member 5 is arranged on the hydraulic cylinder body 1. Figure 2The digital hydraulic cylinder further comprises a hydraulic cylinder body 1, the hydraulic cylinder body 1 extends along the left-right direction, and the hydraulic cylinder body 1 has a first channel 11 extending along the extension direction of the hydraulic cylinder body 1. Specifically, the digital hydraulic cylinder further comprises a first end cover 61 and a second end cover 62, the first end cover 61 is arranged at the left end of the hydraulic cylinder body 1, and the second end cover 62 is arranged at the right end of the hydraulic cylinder body 1. The first end cover 61 is provided with a first hole 611, and the second end cover 62 is provided with a second hole 621.

[0031] As shown in Figures 2 to 4 , the piston rod 2 is arranged in the first channel 11, and the piston rod 2 is movable in the first channel 11 relative to the hydraulic cylinder body 1 along the first direction. Specifically, the piston rod 2 extends along the left-right direction in the first channel 11, and the left end of the piston rod 2 extends out of the first hole 611.

[0032] As shown in Figures 2 to 4 , the sensor assembly 3 is arranged at one end of the piston rod 2 (such as the right end of the piston rod 2 as shown in Figure 2 , the sensor assembly 3 comprises a pull rope 31 and a sensor body 32, one end of the pull rope 31 (such as the right end of the pull rope 31 as shown in Figure 2 ) is arranged on the sensor body 32, and the other end of the pull rope 31 (such as the left end of the pull rope 31 as shown in Figure 2 ) is connected to the piston rod 2, and the piston rod 2 moves along the first direction to drive the pull rope 31 to move relative to the sensor body 32. Specifically, the digital hydraulic cylinder further comprises a connecting frame 63, and the connecting frame 63 is used to connect the sensor assembly 3 and the second end cover 62. The left end of the connecting frame 63 is connected to the second end cover 62, the right end of the connecting frame 63 extends to the right, and the sensor assembly 3 is arranged at the right end of the connecting frame 63.

[0033] Specifically, the pull rope 31 is a steel wire rope.

[0034] A container (not shown) is adapted to contain oil, and a reversing valve 4 is connected between the container and the hydraulic cylinder body 1, and the reversing valve 4 comprises a valve body 41 and a valve core 42, the valve body 41 has a valve cavity 411, the valve core 42 is arranged in the valve cavity 411 and is rotatable relative to the valve body 41 along the first direction, the valve core 42 is connected to the sensor body 32, and the pull rope 31 is connected to the valve core 42, so that the valve core 42 is movable relative to the valve body 41 along the first direction to adjust the oil supply amount of the container to the hydraulic cylinder body 1. Specifically, the oil is medium emulsion or the like.

[0035] As shown in Figure 2 and Figure 3 , a driving member 5 is arranged at one end of the valve core 42 (such as the left end of the valve core 42 as shown in Figure 2The valve core 42 (shown on the right end) is connected to the sensor body 32, and the drive unit 5 drives the valve core 42 to rotate relative to the hydraulic cylinder body 1 about a first direction. The left end of the valve core 42 is connected to the sensor body 32, and the valve core 42 can rotate and move relative to the sensor body 32 about the first direction. Specifically, the drive unit 5 is a stepper motor or a servo motor.

[0036] In this embodiment of the digital hydraulic cylinder, the driving component 5 drives the valve core 42 to rotate in the valve chamber 411 around a first direction, so that the valve core 42 can move in the first direction. The movement of the valve core 42 in the first direction can control the amount of oil flowing into the hydraulic cylinder body 1, thereby causing the piston rod 2 to move in the first direction, which in turn drives the left end of the pull rope 31 to move in the first direction. The sensor body 32 receives the signal generated by the pull rope 31 and transmits it out, so as to realize real-time monitoring of the digital hydraulic cylinder of this embodiment of the invention.

[0037] Therefore, the on / off control of the system circuit of the digital hydraulic cylinder in this embodiment of the invention is realized by the driving component 5, which is conducive to the digitization of the digital hydraulic cylinder system in this embodiment of the invention. The digital hydraulic cylinder in this embodiment of the invention is detected by the displacement of the pull rope 31, which not only realizes digitization and lowers the threshold of digitization, but also has low processing requirements and saves costs.

[0038] In some embodiments, such as Figure 7 As shown, the sensor assembly 3 also includes a sensor 33, a hub 34, an elastic element 35, and a drive shaft 36. The sensor body 32 has a third chamber 321. The sensor 33, hub 34, elastic element 35, and drive shaft 36 are disposed in the third chamber 321. The drive shaft 36 can rotate relative to the sensor body 32 about a first direction. The sensor 33 is disposed at one end of the drive shaft 36, and the other end of the drive shaft 36 (e.g., Figure 7 The right end of the drive shaft 36 shown) and the other end of the valve core 42 (as shown) Figure 2 The left end of the valve core 42 shown is connected, the hub 34 and the elastic element 35 are passed through the drive shaft 36, and one end of the pull rope 31 (as shown) is connected to the left end of the valve core 42. Figure 7 The right end of the pull rope 31 shown is wrapped around the hub 34. The sensor 33 can sense the movement of the pull rope 31. The pull rope 31 moves in the first direction to drive the hub 34 to rotate, thereby causing the drive shaft 36 to rotate around the first direction, so that the valve core 42 moves in the first direction.

[0039] Specifically, such as Figure 7As shown, the sensor body 32 has a first through hole 322 and a second through hole 323, the first through hole 322 is located at the left end surface of the sensor body 32, the second through hole 323 is located at the right end surface of the sensor body 32, and the first through hole 322 and the second through hole 323 are oppositely arranged. The left end of the transmission shaft 36 is located in the first through hole 322, and the first bearing 324 is arranged between the left end of the transmission shaft 36 and the first through hole 322. The right end of the transmission shaft 36 is located in the second through hole 323, and the second bearing 325 is arranged between the right end of the transmission shaft 36 and the second through hole 323, so that the transmission shaft 36 can rotate relative to the sensor body 32 in the left-right direction.

[0040] In some embodiments, as shown in Figure 2 and Figure 4 As shown, the digital hydraulic cylinder further comprises a transmission member 64 connected with the inductor 33, the inductor 33 can convert mechanical movement into electrical signals that can be measured, recorded or transmitted. The elastic member 35 is a coil spring.

[0041] The inductor 33 is arranged at the left end of the transmission shaft 36, and the inductor 33 is located in the first through hole 322. The outer wall surface of the hub 34 has external threads, the right end of the pull rope 31 is wound around the hub 34, and the inductor 33 is connected with the hub 34. The left end of the pull rope 31 moves with the piston rod 2 in the left-right direction, so that the right end of the pull rope 31 drives the hub 34 to rotate in the first direction, and drives the transmission shaft 36 to rotate in the first direction, thereby generating an elastic force of the elastic member 35, and the elastic member 35 is used to ensure that the tension of the pull rope 31 is unchanged.

[0042] When the hub 34 rotates in the first direction, the inductor 33 can be driven to rotate in the first direction, so that the inductor 33 outputs an electrical signal proportional to the movement distance of the pull rope 31 in the first direction, and the electrical signal is output by the transmission member 64, and the displacement, direction and speed of the piston rod 2 when moving in the first direction are measured by the electrical signal. Therefore, the real-time monitoring of the digital hydraulic cylinder of the embodiment of the present application is realized, and the function of digital output is realized.

[0043] In some embodiments, the inductor 33 is an incremental encoder, an absolute value encoder, a conductive plastic potentiometer, a synchronizer or a resolver.

[0044] In some embodiments, as shown in Figure 5 The valve body 41 has a second channel 412, a first port 413, a second port 414, a third port 415 and a fourth port 416. The valve cavity 411 and the second channel 412 extend in the first direction and are arranged at intervals, the valve cavity 411 penetrates the valve body 41, the first port 413 and the second port 414 communicate the outer wall surface of the valve body 41 and the valve cavity 411, and the third port 415 and the fourth port 416 communicate the outer wall surface of the valve body 41, the second channel 412 and the valve cavity 411. Specifically, as shown in Figure 5As shown, the left end of the valve body 41 is connected with the right end of the connecting frame 63, and the right end of the valve body 41 extends to the right. The first port 413 and the second port 414 are arranged in the first direction. The third port 415 and the fourth port 416 are arranged in the first direction, and the third port 415 and the fourth port 416 are in communication with the container, and the oil in the container can flow into the hydraulic cylinder body 1 through the third port 415, and the oil in the hydraulic cylinder body 1 can flow back to the container through the fourth port 416.

[0045] The spool 42 has a third passage 421 and a fourth passage 422, which are arranged in the extension direction of the spool 42, and when the spool 42 moves towards the direction away from the driving member 5, the third port 415, the fourth passage 422 and the second port 414 are in communication, and the fourth port 416, the second passage 412, the third passage 421 and the first port 413 are in communication, and the piston rod 2 moves towards the direction close to the driving member 5. Specifically, the third passage 421 is located at the left end of the spool 42, and the fourth passage 422 is located at the right end of the spool 42. When the spool 42 moves to the left, the oil in the container flows into the hydraulic cylinder body 1 through the third port 415, the fourth passage 422 and the second port 414 in turn, and the oil in the hydraulic cylinder body 1 flows back to the container through the first port 413, the third passage 421, the second passage 412 and the fourth port 416 in turn.

[0046] When the spool 42 moves towards the direction close to the driving member 5 relative to the valve body 41, the third port 415, the third passage 421 and the first port 413 are in communication, and the fourth port 416, the fourth passage 422 and the second port 414 are in communication, and the piston rod 2 moves towards the direction away from the driving member 5.

[0047] Specifically, when the spool 42 moves to the right, the oil in the container flows into the hydraulic cylinder body 1 through the third port 415, the third passage 421 and the first port 413 in turn, and the oil in the hydraulic cylinder body 1 flows back to the container through the second port 414, the fourth passage 422 and the fourth port 416 in turn. Therefore, the spool 42 moves in the first direction to make the third port 415 and the first port 413 in communication, and the fourth port 416 and the second port 414 in communication, or the third port 415 and the first port 413 in communication, and the fourth port 416 and the second port 414 in communication, to realize the flow control of the oil in the container and the oil in the hydraulic cylinder body 1, thereby realizing the control of the opening of the first port 413, the second port 414, the third port 415 and the fourth port 416 and the flow of the oil through the first port 413, the second port 414, the third port 415 and the fourth port 416 by the reversing valve 4.

[0048] In some embodiments, as Figure 5 and Figure 6As shown, the reversing valve 4 further comprises a valve sleeve 43, which is arranged around the outer wall surface of the valve core 42, at least part of the inner wall surface of the valve sleeve 43 is in contact with the outer wall surface of the valve core 42, and at least part of the outer wall surface of the valve sleeve 43 is in contact with the inner wall surface of the valve cavity 411.

[0049] Specifically, the valve core 42 and the outer wall surface and the inner wall surface of the valve cavity 411 have a pre-reserved gap, and the valve sleeve 43 is arranged around the outer wall surface of the valve core 42 to avoid the valve core 42 from contacting the inner wall surface of the valve cavity 411 when rotating or moving in the first direction in the valve cavity 411.

[0050] In some embodiments, as shown in Figure 5 As shown, the valve core 42 further has a first valve port 423, a second valve port 424, a third valve port 425, and a fourth valve port 426, the first valve port 423 and the second valve port 424 are arranged on the outer wall surface of the third channel 421 and are spaced apart along the extension direction of the third channel 421, the first valve port 423 and the second valve port 424 are in communication with the third channel 421, and the third valve port 425 and the fourth valve port 426 are arranged on the outer wall surface of the fourth channel 422 and are spaced apart along the extension direction of the fourth channel 422, the third valve port 425 and the fourth valve port 426 are in communication with the fourth channel 422.

[0051] Specifically, the first valve port 423 is a plurality of first valve ports 423, which are arranged around the outer wall surface of the third channel 421, and the second valve port 424 is a plurality of second valve ports 424, which are arranged around the outer wall surface of the third channel 421. When the valve core 42 moves to the left, the first port 413 and the fourth port 416 are in communication with the third channel 421 through the first valve port 423 or the second valve port 424, and when the valve core 42 moves to the right, the first port 413 and the third port 415 are in communication with the third channel 421 through the first valve port 423 or the second valve port 424.

[0052] The third valve port 425 is a plurality of third valve ports 425, which are arranged around the outer wall surface of the fourth channel 422, and the fourth valve port 426 is a plurality of fourth valve ports 426, which are arranged around the outer wall surface of the fourth channel 422. When the valve core 42 moves to the left, the second port 414 and the third port 415 are in communication with the fourth channel 422 through the third valve port 425 or the third valve port 425, and when the valve core 42 moves to the right, the second port 414 and the fourth port 416 are in communication with the fourth channel 422 through the third valve port 425 or the third valve port 425.

[0053] In some embodiments, as shown in Figure 5 and Figure 6 As shown, the valve sleeve 43 has a communication hole 431, which is formed from the outer wall surface of the valve sleeve 43 towards the inner wall surface of the valve sleeve 43, and the communication hole 431 communicates the valve core 42 and the valve body 41.

[0054] Specifically, the communication holes 431 are multiple, and the multiple communication holes 431 are arranged at intervals along the extension direction of the valve sleeve 43, and the communication holes 431 are used to communicate the valve core 42 and the valve body 41.

[0055] In some embodiments, as shown in Figure 6 The digital hydraulic cylinder further includes a first seal 71 and a second seal 72. The first seal 71 is arranged between the outer wall surface of the valve sleeve 43 and the inner wall surface of the valve cavity 411, the first seal 71 is arranged around the outer wall surface of the valve sleeve 43, and the first seal 71 is multiple, and the multiple first seals 71 are arranged at intervals along the extension direction of the valve sleeve 43, and the seals are arranged alternately with the first port 413, the second port 414, the third port 415 and the fourth port 416.

[0056] The second seal 72 is arranged between the inner wall surface of the valve sleeve 43 and the outer wall surface of the valve core 42, the second seal 72 is arranged around the outer wall surface of the valve core 42, and the second seal 72 is multiple, and the multiple second seals 72 are arranged at intervals along the extension direction of the valve core 42, and the seals are arranged alternately with the first valve port 423, the second valve port 424, the third valve port 425 and the fourth valve port 426. The first seal 71 and the second seal 72 can prevent oil from overflowing.

[0057] In some embodiments, as shown in Figures 2 to 4 The hydraulic cylinder body 1 has a first chamber 12 and a second chamber 13, the first chamber 12 is located between the outer wall surface of the piston rod 2 and the inner wall surface of the hydraulic cylinder body 1, and the first chamber 12 is adapted to be filled with oil, and the second chamber 13 is located between the end surface of one end of the piston rod 2 and the inner wall surface of one end of the hydraulic cylinder body 1, and the second chamber 13 is adapted to be filled with oil. Specifically, the digital hydraulic cylinder further includes a first communication member 73 and a second communication member 74. The first communication member 73 communicates the first port 413 and the second chamber 13, and the second communication member 74 communicates the second port 414 and the first chamber 12.

[0058] When the valve core 42 moves away from the driving member 5, the oil flows into the first chamber 12 through the third port 415, the fourth passage 422 and the second port 414, and the oil in the second chamber 13 flows out through the first port 413, the third passage 421, the second passage 412 and the fourth port 416, so that the piston rod 2 moves relative to the hydraulic cylinder body 1 towards the driving member 5, thereby driving the other end of the pull rope 31 to move towards the sensor body 32.

[0059] Specifically, when the valve core 42 moves to the left, the oil in the container flows into the first chamber 12 through the third port 415, the fourth channel 422, the second port 414 and the second communication member 74 in sequence, the oil in the second chamber 13 flows back to the container through the first port 413, the third channel 421, the second channel 412, the fourth port 416 and the first communication member 73 in sequence, so that the piston rod 2 moves to the right, thereby driving the left end of the pull rope 31 to move to the right.

[0060] When the valve core 42 moves towards the direction close to the driving member 5, the oil in the first chamber 12 flows out through the second port 414, the fourth channel 422 and the fourth port 416, and the oil flows into the second chamber 13 through the third port 415, the third channel 421 and the first port 413, so that the piston rod 2 moves relative to the hydraulic cylinder body 1 towards the direction away from the driving member 5, thereby driving the other end of the pull rope 31 to move towards the direction away from the sensor body 32.

[0061] Specifically, when the valve core 42 moves to the right, the oil in the first chamber 12 flows back to the container through the second communication member 74, the second port 414, the fourth channel 422 and the fourth port 416 in sequence, and the oil in the container flows into the second chamber 13 through the third port 415, the third channel 421, the first port 413 and the first communication member 73 in sequence, so that the piston rod 2 moves to the left, thereby driving the left end of the pull rope 31 to move to the left.

[0062] In some embodiments, as shown in FIG. 1, the reversing valve 4 and the hydraulic cylinder body 1 are arranged in the up-down direction, so that the reversing valve 4 and the hydraulic cylinder body 1 are arranged in parallel, so that the digital hydraulic cylinder of the embodiment of the present application saves space. Figures 8-10

[0063] The digital hydraulic cylinder further comprises a valve block 92 arranged between the valve body 41 of the reversing valve 4 and the hydraulic cylinder body 1, for connecting the valve body 41 and the hydraulic cylinder body 1. The valve block 92 comprises a body 921, which has a first connecting port 922, a second connecting port 923, a third connecting port 924, a fourth connecting port 925 and a fifth connecting port (not shown). The first connecting port 922 communicates the fourth port 416 and the second chamber 13, the second connecting port 923 and the third connecting port 924 communicate, the third connecting port 924 communicates with the first chamber 12, the fourth connecting port 925 and the fifth connecting port communicate, and the fifth connecting port communicates with the sensor 33, so that the transmission member 64 can extend out of the valve block 92 through the fifth connecting port and the fourth connecting port 925, thereby facilitating observation.

[0064] ​Specifically, when the valve core 42 moves to the left, the oil in the container flows into the first chamber 12 through the second port 414, the fourth channel 422, the third port 415, the second connection port 923, and the third connection port 924 in sequence. The oil in the second chamber 13 flows back into the container through the first connection port 922, the fourth port 416, the second channel 412, the third channel 421, and the first port 413 in sequence, so that the piston rod 22 moves to the right, thereby driving the left end of the pull rope 31 to move to the right.

[0065] Specifically, when the valve core 42 moves to the right, the oil in the first chamber 1212 flows back into the container through the third connection port 924, the second connection port 923, the third port 415, the third channel 421 and the first port 413 in sequence. The oil in the container flows into the second chamber 13 through the second port 414, the fourth channel 422 and the first connection port 922 in sequence, so that the piston rod 2 moves to the left, thereby driving the left end of the pull rope 31 to move to the left.

[0066] In some embodiments, such as Figure 2 and Figure 3 As shown, the digital hydraulic cylinder also includes a guide 75. The piston rod 2 has a fifth channel 21, which is opened along the extension direction of the piston rod 2. The guide 75 is disposed in the fifth channel 21, and at least a portion of the guide 75 is located in the second chamber 13. The guide 75 has a through hole 751 extending through the guide 75 along its extension direction. The pull rope 31 passes through the through hole 751 and is mounted on the guide 75 to isolate it from the oil in the second chamber 13.

[0067] Specifically, the left end of the guide 75 is located in the fifth channel 21, and the right end of the guide 75 passes through the right end of the piston rod 2, the second chamber 13, and the second hole 621 in sequence. The left end of the pull rope 31 passes through the through hole 751 and is connected to the left end of the piston rod 2, so that the guide 75 isolates the pull rope 31 from the oil in the second chamber 13. This allows the pull rope 31 to overcome the characteristics of water quality and lubrication within the guide 75, making it less susceptible to the influence of oil when the pull rope 31 provides feedback. This improves the reliability of the signal, ensures the accuracy of the signal transmission by the sensor 33, and achieves simplified sensing and maintainability.

[0068] In some embodiments, such as Figure 2 and Figure 4As shown, the digital hydraulic cylinder further comprises a connecting assembly 76, the connecting assembly 76 comprises a first part 761 and a second part 762, at least part of the first part 761 is connected to the one end of the spool 42 close to the transmission shaft 36, the outer wall surface of the first part 761 has external threads, the second part 762 is connected to the other end of the transmission shaft 36, the second part 762 has a mounting hole 7621, the mounting hole 7621 is opened along the first direction, the inner wall surface of the mounting hole 7621 has internal threads, the first part 761 is screwed with the mounting hole 7621, the driving member 5 drives the valve body 41 to rotate around the first direction to make the first part 761 move in the first direction in the mounting hole 7621, so as to drive the spool 42 to move in the first direction.

[0069] Specifically, the driving member 5 drives the spool 42 to rotate around the first direction to drive the first part 761 to rotate in the mounting hole 7621, so that the first part 761 can move in the first direction in the mounting hole 7621, thereby making the spool 42 move in the left-right direction. The pull rope 31 moves in the first direction to drive the transmission shaft 36 to rotate around the first direction, so that the second part 762 moves on the first part 761. The structure of the connecting assembly 76 is simple, easy to manufacture, and saves costs. The matching mode of the first part 761 and the second part 762 is simple, so that the connection mode between the spool 42 and the transmission shaft 36 is simple.

[0070] In some embodiments, as shown in Figure 8 and Figure 9 As shown, the digital hydraulic cylinder further comprises a transmission assembly 91, the transmission assembly 91 is used for connecting the one end of the spool 42 away from the driving member 5 and the one end of the transmission shaft 36 away from the hub 34.

[0071] The transmission assembly 91 comprises a first gear 911, a connecting belt 912 and a second gear 913. The first gear 911 is arranged on the first part 761, and the first gear 911 is screwed with the first part 761, and the first gear 911 can move along the extension direction of the first part 761 relative to the first part 761. The second gear 913 is arranged at the other end of the transmission shaft 36, the connecting belt 912 connects the first gear 911 and the second gear 913, the second gear 913 is driven to rotate around the left-right direction by the transmission shaft 36, and the second gear 913 drives the connecting belt 912 to move the first gear 911 on the first part 761.

[0072] The structure of the transmission assembly 91 is simple, easy to manufacture, and saves costs. The matching mode between the first gear 911, the second gear 913 and the connecting belt 912 is simple, so that the connection mode between the spool 42 and the transmission shaft 36 is simple.

[0073] In some embodiments, as shown in Figure 2 and Figure 3As shown, the digital hydraulic cylinder further comprises a lifting lug 8 arranged at the other end of the piston rod 2, at least part of the lifting lug 8 being located in the fifth channel 21 and connected with the other end of the pull rope 31.

[0074] Specifically, the lifting lug 8 is arranged at the left end of the piston rod 2, at least part of the lifting lug 8 being located in the fifth channel 21 and connected with the left end of the pull rope 31, so that the pull rope 31 and the piston rod 2 are firmly connected.

[0075] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0076] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0077] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected or in communication with each other; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication or interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0078] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0079] In this disclosure, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the present disclosure. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily referred to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, the terms "comprising", "containing", "having" and "including" and their derivatives, are not intended to exclude other features, structures, materials, or characteristics not expressly mentioned. The terms "comprising", "containing", "having" and "including" and their derivatives are intended to be equivalent to the terms "consisting of" and "consisting essentially of" and their derivatives.

[0080] Although the above-mentioned embodiments have been shown and described, it is understood that the above-mentioned embodiments are exemplary, and cannot be understood as limiting the present disclosure, and the changes, modifications, replacements and variations of the above-mentioned embodiments made by those skilled in the art are within the protection scope of the present disclosure.

Claims

1. A digital hydraulic cylinder, characterized by The application relates to a hydraulic cylinder, comprising: a hydraulic cylinder body (1) extending along a first direction, the hydraulic cylinder body (1) having a first channel (11) extending along the extension direction of the hydraulic cylinder body (1); a piston rod (2) arranged in the first channel (11), the piston rod (2) being movable in the first channel (11) relative to the hydraulic cylinder body (1) along the first direction; a sensor assembly (3) arranged at one end of the piston rod (2), the sensor assembly (3) comprising a pull rope (31) and a sensor body (32), one end of the pull rope (31) being arranged on the sensor body (32), the other end of the pull rope (31) being connected to the piston rod (2), the piston rod (2) being moved along the first direction to drive the pull rope (31) to move relative to the sensor body (32); a reversing valve (4) and a container adapted to contain oil, the reversing valve (4) being connected to the container and the hydraulic cylinder body (1), the reversing valve (4) comprising a valve body (41) and a valve core (42), the valve body (41) having a valve cavity (411), the valve core (42) being arranged in the valve cavity (411) and being rotatable relative to the valve body (41) about the first direction, the valve core (42) being connected to the sensor body (32), and the pull rope (31) being connected to the valve core (42), so that the valve core (42) is movable relative to the valve body (41) along the first direction to adjust the oil supply amount of the container to the hydraulic cylinder body (1); the valve core (42) has a third channel (421), a fourth channel (422), a first valve port (423), a second valve port (424), a third valve port (425) and a fourth valve port (426), the first valve port (423) and the second valve port (424) being arranged on the outer wall surface of the third channel (421) and being spaced apart along the extension direction of the third channel (421), the first valve port (423) and the second valve port (424) being connected to the third channel (421), the third valve port (425) and the fourth valve port (426) being arranged on the outer wall surface of the fourth channel (422) and being spaced apart along the extension direction of the fourth channel (422), the third valve port (425) and the fourth valve port (426) being connected to the fourth channel (422); a driving member (5) connected to one end of the valve core (42), the driving member (5) driving the valve core (42) to rotate relative to the hydraulic cylinder body (1) about the first direction.

2. The digital hydraulic cylinder of claim 1, wherein, The sensor assembly (3) further comprises a sensor (33), a hub (34), a spring (35) and a transmission shaft (36), the sensor body (32) has a third chamber (321), the sensor (33), the hub (34), the spring (35) and the transmission shaft (36) are arranged in the third chamber (321), the transmission shaft (36) is rotatable relative to the sensor body (32) about the first direction, the sensor (33) is arranged at one end of the transmission shaft (36), the other end of the transmission shaft (36) is connected to the other end of the valve core (42), the hub (34) and the spring (35) are arranged on the transmission shaft (36), one end of the pull rope (31) is wound around the hub (34), the sensor (33) can sense the movement of the pull rope (31), the pull rope (31) moves in the first direction to drive the hub (34) to rotate so that the transmission shaft (36) rotates about the first direction, so that the valve core (42) moves in the first direction.

3. The digital hydraulic cylinder of claim 2, wherein, The valve body (41) has a second channel (412), a first port (413), a second port (414), a third port (415) and a fourth port (416), the valve cavity (411) and the second channel (412) extend along the first direction and are arranged at intervals, the valve cavity (411) penetrates the valve body (41), the first port (413) and the second port (414) communicate the outer wall surface of the valve body (41) and the valve cavity (411), the third port (415) and the fourth port (416) communicate the outer wall surface of the valve body (41), the second channel (412) and the valve cavity (411); The third channel (421) and the fourth channel (422) are arranged at intervals along the extension direction of the valve core (42), when the valve core (42) moves towards the direction away from the driving member (5), the third port (415), the fourth channel (422) and the second port (414) are communicated, the fourth port (416), the second channel (412), the third channel (421) and the first port (413) are communicated, the piston rod (2) moves towards the direction close to the driving member (5), When the valve core (42) moves relative to the valve body (41) towards the direction close to the driving member (5), the third port (415), the third channel (421) and the first port (413) are communicated, the fourth port (416), the fourth channel (422) and the second port (414) are communicated, the piston rod (2) moves towards the direction away from the driving member (5).

4. The digital hydraulic cylinder of claim 3, wherein, The reversing valve (4) further comprises a valve sleeve (43), the valve sleeve (43) is arranged around the outer wall surface of the valve core (42), at least part of the inner wall surface of the valve sleeve (43) is in contact with the outer wall surface of the valve core (42), and at least part of the outer wall surface of the valve sleeve (43) is in contact with the inner wall surface of the valve cavity (411).

5. The digital hydraulic cylinder of claim 4, wherein, The valve sleeve (43) has a communication hole (431) which is opened from the outer wall surface of the valve sleeve (43) to the inner wall surface of the valve sleeve (43) and which communicates the valve core (42) and the valve body (41).

6. The digital hydraulic cylinder of claim 3, wherein, The hydraulic cylinder body (1) has a first chamber (12) and a second chamber (13), the first chamber (12) is located between the outer wall surface of the piston rod (2) and the inner wall surface of the hydraulic cylinder body (1), the first chamber (12) is suitable for being filled with oil, the second chamber (13) is located between the end surface of one end of the piston rod (2) and the inner wall surface of one end of the hydraulic cylinder body (1), the second chamber (13) is suitable for being filled with oil, When the valve core (42) moves towards the direction away from the driving part (5), the oil flows into the first chamber (12) through the third port (415), the fourth channel (422) and the second port (414), the oil in the second chamber (13) flows out through the first port (413), the third channel (421), the second channel (412) and the fourth port (416), so that the piston rod (2) moves relative to the hydraulic cylinder body (1) towards the direction close to the driving part (5), thereby driving the other end of the pull rope (31) to move towards the direction close to the sensor body (32), When the valve core (42) moves towards the direction close to the driving part (5), the oil in the first chamber (12) flows out through the second port (414), the fourth channel (422) and the fourth port (416), the oil flows into the second chamber (13) through the third port (415), the third channel (421) and the first port (413), so that the piston rod (2) moves relative to the hydraulic cylinder body (1) towards the direction away from the driving part (5), thereby driving the other end of the pull rope (31) to move towards the direction away from the sensor body (32).

7. The digital hydraulic cylinder of claim 6, wherein, Further comprising a guide part (75), the piston rod (2) has a fifth channel (21) which is opened along the extension direction of the piston rod (2), the guide part (75) is arranged in the fifth channel (21), at least part of the guide part (75) is located in the second chamber (13), the guide part (75) has a through hole (751) which penetrates the guide part (75) along the extension direction of the guide part (75), the pull rope (31) is arranged on the guide part (75) through the through hole (751) to be isolated from the oil in the second chamber (13).

8. The digital hydraulic cylinder of any of claims 2-7, wherein, The connecting assembly (76) comprises a first part (761) and a second part (762), at least part of the first part (761) is connected to the valve core (42) near one end of the transmission shaft (36), the outer wall surface of the first part (761) has external threads, the second part (762) is connected to the other end of the transmission shaft (36), the second part (762) has a mounting hole (7621), the mounting hole (7621) is opened along the first direction, the inner wall surface of the mounting hole (7621) has internal threads, the first part (761) is threadedly connected with the mounting hole (7621), the driving member (5) drives the valve core (42) to rotate around the first direction to make the first part (761) move in the mounting hole (7621) along the first direction, thereby driving the valve core (42) to move in the first direction.

9. The digital hydraulic cylinder of claim 7, wherein, The lifting lug (8) is arranged at the other end of the piston rod (2), at least part of the lifting lug (8) is located in the fifth channel (21) and connected to the other end of the pull rope (31).

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