Rotary valve digital cylinder assembly and operating equipment

Abstract

The present invention belongs to the technical field of mechanical equipment and provides a rotary valve type digital cylinder assembly and operating equipment, the rotary valve type digital cylinder assembly includes a cylinder body, a digital valve, a driving mechanism and a feedback mechanism, a piston rod is arranged in the cylinder body, the digital valve includes a valve sleeve, a valve core and an elastic torque member, the elastic torque member is arranged between the valve core and the valve sleeve, the driving mechanism is connected to the valve core in a transmission manner, the feedback mechanism includes a nut arranged on the piston rod and a spiral transmission rod screwed with the nut, one end of the spiral transmission rod axially extends out of the cylinder body and is fixedly connected to the valve sleeve, the elastic torque member is used to keep the valve sleeve and the valve core relatively still when the load resistance of the piston rod is less than the torque threshold corresponding to the elastic torque member, and is used to allow the valve sleeve to rotate relative to the valve core when the load resistance of the piston rod is greater than the torque threshold. By arranging the elastic torque member between the valve core and the valve sleeve of the digital valve, it is possible to fully utilize the power of the driving mechanism.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical equipment, and in particular relates to a rotary valve type digital cylinder assembly and operating equipment. Background Art

[0002] In industrial scenarios that require high-precision control, digital cylinders are becoming increasingly popular due to their high control accuracy and strong control robustness. Digital cylinders are usually composed of digital hydraulic valves and mechanical position feedback cylinders. Digital hydraulic valves are usually slide valves, and some technologies also use rotary valves. During the operation of the digital cylinder, the stepper motor usually outputs control instructions. The digital valve converts the motor's instructions into linear or rotary motion of the valve core to control the actuation of the hydraulic cylinder. At the same time, the mechanical feedback structure of the hydraulic cylinder gradually closes the valve port during the movement of the cylinder, thereby achieving high-precision digital pulse control of the cylinder position.

[0003] For example, Chinese patent CN112664500A discloses a rotary valve digital oil cylinder, in which a servo motor E is connected to a valve core A, a ball screw D is connected to a valve sleeve B, and is also connected to a cylinder piston F. The piston F of the oil cylinder C drives the valve sleeve B to rotate in the same direction and speed as the servo motor E. When the servo motor E drives the cross slider coupling G at the required speed to drive the valve core A to rotate a certain angle, the valve port of the rotary valve is opened, the oil pressure gradually increases, and the piston F in the oil cylinder C is controlled to move forward or backward. The movement of the piston F further drives the feedback nut H of the ball screw D to move forward or backward. The movement of the feedback nut H drives the screw of the ball screw D to rotate forward or reverse. The rotation of the screw drives the valve sleeve B to move in the same direction as the servo motor E, so that the valve sleeve B keeps running at the same speed as the servo motor E; when the servo motor E stops, the piston F of the oil cylinder runs to close the valve port of the rotary valve, and the oil cylinder C stops running.

[0004] In this type of rotary valve digital cylinder, the motor is only a control element and can only control the on and off of the hydraulic valve, resulting in the motor's own power not being effectively utilized and a low energy efficiency level. Summary of the invention

[0005] In view of the above-mentioned defects or shortcomings, the present invention provides a rotary valve type digital cylinder assembly and operating equipment, aiming to solve the technical problem that the existing rotary valve type digital cylinder cannot effectively utilize the power of the motor itself and has a low energy efficiency level.

[0006] To achieve the above-mentioned purpose, the present invention provides a rotary valve type digital cylinder assembly, including a cylinder body, a digital valve, a driving mechanism and a feedback mechanism, wherein a piston rod is arranged in the cylinder body, the digital valve includes a valve sleeve, a valve core and an elastic torsion member, the valve core is rotatably arranged in the valve sleeve, the elastic torsion member is arranged between the valve core and the valve sleeve, the driving mechanism is transmission-connected with the valve core, the feedback mechanism includes a nut arranged on the piston rod and a spiral transmission rod screwed with the nut, one end of the spiral transmission rod axially extends out of the cylinder body and is fixedly connected with the valve sleeve, wherein, when the load resistance of the piston rod is less than the torque threshold value corresponding to the elastic torsion member, the elastic torsion member is used for transmission between the valve sleeve and the valve core, and when the load resistance of the piston rod is greater than the torque threshold value of the elastic torsion member, the elastic torsion member is used for driving the valve sleeve and the valve core to rotate relative to each other to open the digital valve.

[0007] In an embodiment of the present invention, the valve sleeve includes a sleeve body and a connecting end cover, the sleeve body is sleeved on the radial outer side of the valve core, the connecting end cover is installed at one end of the sleeve body facing the spiral transmission rod, the connecting end cover is used to be fixedly connected to the spiral transmission rod, the elastic torsion piece is fixedly connected between the valve core and the connecting end cover and can be elastically deformed, and the elastic torsion piece is used to limit the relative rotation between the valve core and the sleeve body when the torque of the valve core is less than the torque threshold of the elastic torsion piece.

[0008] In an embodiment of the present invention, the elastic torsion member is one of an elastic torsion bar, a torsion spring, a spiral spring, and a spring.

[0009] In an embodiment of the present invention, the valve sleeve further comprises a thrust end cover, which is arranged at two ends of the sleeve body opposite to the connecting end cover, and the thrust end cover and the connecting end cover are respectively used to limit the axial movement of the valve core.

[0010] In an embodiment of the present invention, a first lubricating member is provided between the connecting end cover and the axial end surface of the valve core, and / or a second lubricating member is provided between the valve core and the thrust end cover.

[0011] In an embodiment of the present invention, the digital valve further comprises a limit assembly arranged between the valve core and the valve sleeve, and the limit assembly is used to limit the relative rotation angle stroke between the valve core and the valve sleeve.

[0012] In an embodiment of the present invention, the limit assembly includes a limit block and a limit ring, the limit block is arranged on the valve core, the limit ring is arranged on the valve sleeve and is provided with a limit groove radially aligned with the limit block, and the limit block extends into the limit groove.

[0013] In an embodiment of the present invention, the driving mechanism comprises a coupling assembly and a driving member body, and the output shaft of the driving member body is drivingly connected to the valve core through the coupling assembly.

[0014] In an embodiment of the present invention, an oil inlet, an oil return port, a first working oil port and a second working oil port are provided on the valve sleeve, and the first working oil port and the second working oil port are respectively connected to the first cavity and the second cavity of the cylinder body, and the valve core is used to rotate so that one of the oil inlet and the oil return port is connected to the first working oil port, and the remaining one of the oil inlet and the oil return port is connected to the second working oil port.

[0015] In an embodiment of the present invention, an axially extending through-channel is provided in the piston rod, the opening of the through-channel is provided on the piston of the piston rod, a nut is provided on the opening of the through-channel, a spiral transmission rod is screwed on the nut and one end extends into the through-channel, and the other end of the spiral transmission rod extends axially out of the end wall of the cylinder body of the cylinder body and is fixedly connected to the valve sleeve.

[0016] To achieve the above object, the present invention further provides an operating device, wherein the operating device includes the rotary valve type digital cylinder assembly described above.

[0017] Through the above technical solution, the rotary valve type digital cylinder assembly provided by the embodiment of the present invention has the following beneficial effects:

[0018] The rotary valve type digital cylinder assembly of the present invention is provided with an elastic torsion piece between the valve core and the valve sleeve of the digital valve. When the driving mechanism drives the valve core to rotate, if the load of the piston rod is small, the valve sleeve will rotate with the valve core under the action of the elastic torsion piece, so that it can be converted into a telescopic drive of the piston rod under the transmission of the spiral transmission rod and the nut. In this case, the movement of the piston rod is driven entirely by the driving mechanism. When the driving mechanism drives the valve core to rotate, if the load of the piston rod is large, the rotation of the valve core will force the elastic torsion piece to produce elastic deformation. At this time, relative rotation occurs between the valve core and the valve sleeve, causing the digital valve to open, which helps the external hydraulic oil to enter the cylinder body through the digital valve, thereby driving the piston rod to move. At this time, part of the driving force of the piston rod comes from the hydraulic oil, and part comes from the driving mechanism. In the above two working situations, the driving mechanism participates in the driving of the piston rod, so as to fully utilize the power of the driving mechanism. In addition, when the valve sleeve and the valve core have a relative angular displacement, and the valve sleeve is reset under the drive of the spiral transmission rod, the elastic force of the elastic torsion piece can accelerate the reset speed of the valve sleeve, thereby improving the switching frequency response of the digital valve and realizing the rapid self-return function. Furthermore, in the embodiment of the present invention, the elastic force of the elastic torsion piece can lock the valve core in the cut-off position of the working oil port in the shutdown state, thereby avoiding external disturbances from interfering with the digital valve and realizing the mid-position fixing function.

[0019] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide an understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 is a structural schematic diagram of a rotary valve type digital cylinder assembly according to an embodiment of the present invention;

[0022] Figure 2 is a schematic cross-sectional structural diagram of a digital valve according to an embodiment of the present invention;

[0023] Figure 3 Schematic diagram of the internal structure of a digital valve according to an embodiment of the present invention.

[0024] Description of Reference Numerals

[0025] 1. Cylinder body; 11. Piston rod; 111. Passage; 12. Cylinder body; 13. Second cavity; 14. First cavity; 2. Digital valve; 21. Valve sleeve; 211. Sleeve body; 212. Connecting end cover; 212a. Mounting cavity; 213. Thrust end cover; 22. Valve core; 23. Elastic torque member; 24. Limiting assembly; 241. Limiting block; 242. Limiting ring; 243. Limiting groove; 25. First lubricating member; 26. Second lubricating member; 27. Valve housing; 3. Driving mechanism; 31. Coupling assembly; 311. Cross elastic body; 312. Fork; 32. Driving member body; 4. Feedback mechanism; 41. Nut; 42. Screw transmission rod; P. Oil inlet; T. Oil return; A. First working oil port; B. Second working oil port. DETAILED DESCRIPTION

[0026] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0027] The rotary valve type digital cylinder assembly of the present invention will be described below with reference to the accompanying drawings.

[0028] The present invention provides a rotary valve type digital cylinder assembly, such as Figure 1 and Figure 2 As shown, the rotary valve type digital cylinder assembly includes:

[0029] The oil cylinder body 1 comprises a cylinder body 12 and a piston rod 11;

[0030] The digital valve 2 is a rotary valve and includes a valve sleeve 21, a valve core 22 and an elastic torque member 23. The valve core 22 is rotatably arranged in the valve sleeve 21, and the elastic torque member 23 is arranged between the valve core 22 and the valve sleeve 21;

[0031] A driving mechanism 3 is connected to the valve core 22 and is used to drive the valve core 22 to rotate;

[0032] The feedback mechanism 4 includes a nut 41 disposed on the piston rod 11 and a spiral transmission rod 42 screwed together with the nut 41 . One end of the spiral transmission rod 42 passes through the nut 41 , and the other end axially extends out of the cylinder body 1 and is fixedly connected to the valve sleeve 21 .

[0033] Among them, when the load resistance of the piston rod 11 is less than the torque threshold corresponding to the elastic torque member 23, the elastic torque member 23 is used for transmission between the valve sleeve 21 and the valve core 22, and when the load resistance of the piston rod 11 is greater than the torque threshold of the elastic torque member 23, the elastic torque member 23 is used to drive the valve sleeve 21 and the valve core 22 to rotate relative to each other to open the digital valve.

[0034] The axial direction of the cylinder body 1 is in the same direction as the extension and retraction direction of the piston rod 11. When the piston rod 11 retracts, the nut 41 can drive the spiral transmission rod 42 to rotate. Conversely, when the spiral transmission rod 42 rotates, because its axial position is fixed, it can also drive the piston rod 11 to move through the nut 41.

[0035] The relative movement between the valve core 22 and the valve sleeve 21 can switch the digital valve 2 between the open and closed states. When the digital valve 2 is open, the external hydraulic oil can reach the cylinder body 1 through the digital valve 2, and when the digital valve 2 is closed, the external hydraulic oil is mutually closed relative to the cylinder body 1, or the driving path of the external hydraulic power source to the cylinder body 1 is cut off. In the case of low load resistance, the elastic torsion member 23 can be used for transmission between the valve core 22 and the valve sleeve 21 to limit the relative rotation between the two, for example, so that the valve core 22 and the valve sleeve 21 are relatively stationary, or so that although the valve core 22 and the valve sleeve 21 have relative rotation, the relative angular displacement that causes the digital valve 2 to open will not be reached; in the case of high load resistance, the elastic torsion member 23 is elastically deformed, and a large relative angular displacement is generated between the valve core 22 and the valve sleeve 21, thereby causing the digital valve 2 to open.

[0036] The load resistance is relative to the torque threshold of the elastic torque member 23. To a certain extent, the torque threshold refers to the minimum torque required for the elastic torque member 23 to be elastically deformed to open the digital valve 2. When the torsional resistance between the valve core 22 and the valve sleeve 21 is greater than the torque threshold, the rotation of the valve core 22 will force the elastic torque member 23 to deform, causing the valve sleeve 21 and the valve core 22 to have sufficient relative angular displacement to open the digital valve 2. When the torsional resistance between the valve core 22 and the valve sleeve 21 is less than the torque threshold, the rotation of the valve core 22 will drive the valve sleeve 21 to rotate together through the transmission of the elastic torque member 23, and the relative rotation between the valve core 22 and the valve sleeve 21 is restricted, and the digital valve 2 is cut off. By arranging the elastic torque member 23 between the valve sleeve 21 and the valve core 22, the rotary valve type digital cylinder assembly of the present invention can have a first working mode and a second working mode.

[0037] like Figure 1 and Figure 2 As shown, when the driving mechanism 3 drives the valve core 22 to rotate, if the load of the piston rod 11 is small, and the torsional resistance between the valve core 22 and the valve sleeve 21 is less than the torque threshold, the valve sleeve 21 will rotate with the valve core 22 under the action of the elastic torque member 23 between the valve core 22 and the valve sleeve 21. Since the load of the oil cylinder body 1 is relatively low, the torque of the driving mechanism 3 can be converted into the telescopic driving force of the piston rod 11 through the transmission of the spiral transmission rod 42 and the nut 41. Since the torque output by the driving mechanism 3 has not reached the torque threshold of the elastic torque member 23, there is basically no relative movement between the valve core 22 and the valve sleeve 21, or although there is relative rotation between the two, the relative angular displacement does not reach the opening condition of the digital valve 2. In this case, the hydraulic circuit is not connected, the hydraulic oil does not participate in the driving of the oil cylinder body 1, the driving of the piston rod 11 is only driven by the driving mechanism 3, and the rotary valve type digital cylinder assembly is in the first working mode.

[0038] When the driving mechanism 3 drives the valve core 22 to rotate, if the load of the piston rod 11 is large and the torsional resistance between the valve core 22 and the valve sleeve 21 is greater than the torque threshold, the rotation of the valve core 22 will force the elastic torsion member 23 to produce elastic deformation, and a large relative angular displacement will occur between the valve core 22 and the valve sleeve 21. The digital valve can be opened by the relative movement of the valve core 22, and the working oil port on the valve sleeve 21 is switched from the cut-off state to the hydraulic oil inlet and outlet state. The working oil port is connected, and the external hydraulic oil will enter one of the working chambers of the cylinder body 1 through the working oil port, and the hydraulic oil in the other working chamber will also return oil through the working oil port for oil return, and the piston rod 11 can be driven to move by the pressure oil. In this case, part of the driving force of the piston rod 11 comes from the hydraulic oil and part comes from the driving mechanism 3. The driving mechanism 3 can assist the driving of the piston rod 11, and the rotary valve digital cylinder assembly is in the second working mode.

[0039] Among them, in the second working mode, when the driving mechanism 3 stops driving, the piston rod 11 continues to move and drives the spiral transmission rod 42 to rotate through the nut 41. The rotation of the spiral transmission rod 42 will drive the valve sleeve 21 to rotate in the closing direction of the working oil port (the reset direction of the elastic torque member 23) until the working oil port is gradually closed. Through the spiral transmission rod 42 and the nut 41, the negative feedback control of the rotary valve type digital cylinder assembly can be realized. In the process of closing the working oil port, the reset elastic force of the elastic torque member 23 can accelerate the reset speed of the valve sleeve 21, thereby improving the switching frequency response of the digital valve 2. When the cylinder is in a stopped state, the elastic torque member 23 can lock the valve core 22 in the middle position (the cut-off position of the working oil port), thereby avoiding interference of external disturbances on the digital valve 2 and avoiding malfunction of the digital valve 2.

[0040] In summary, by arranging an elastic torsion member 23 between the valve core 22 and the valve sleeve 21 of the digital valve 2, the cylinder assembly can not only enable the rotary valve type digital cylinder assembly to have the first working mode and the second working mode, thereby fully utilizing the power of the driving mechanism 3 and increasing the energy efficiency ratio of the cylinder assembly, but also enable the digital valve 2 to have the functions of center fixing and rapid self-return, thereby increasing the working reliability and dynamic performance of the digital valve 2 and improving the switching frequency response of the digital valve 2.

[0041] In an embodiment of the present invention, the nut 41 may be a ball nut 41 , and the spiral transmission rod 42 may be a ball screw or a ball screw. By providing a ball, the transmission resistance between the nut 41 and the spiral transmission rod 42 may be reduced.

[0042] like Figure 1 and Figure 2 As shown, in an embodiment of the present invention, the valve sleeve 21 includes a sleeve body 211 and a connecting end cover 212. The sleeve body 211 is sleeved on the radial outer side of the valve core 22 and can rotate together with the valve core 22 through the elastic torsion member 23. The connecting end cover 212 is detachably installed on the end of the sleeve body 211 facing the spiral transmission rod 42. One side of the connecting end cover 212 is provided with a mounting cavity 212a for fixed connection with the spiral transmission rod 42, and the other side is arranged toward the axial end face of the valve core 22. The elastic torsion member 23 is fixedly connected between the valve core 22 and the connecting end cover 212 and can be elastically deformed. The elastic torsion member 23 is configured to generate elastic deformation when the torque between the valve core 22 and the valve sleeve 21 is greater than a preset value. By setting the elastic torsion member 23, the relative rotation between the valve core 22 and the sleeve body 211 can be limited when the torque between the valve core 22 and the valve sleeve 21 is less than the torque threshold of the elastic torsion member 23. In order to avoid oil leakage from the working oil port of the valve sleeve 21, the valve sleeve 21 and the valve core 22 need to be tightly connected. In order to facilitate the installation of the elastic torsion member 23, a connecting end cover 212 can be provided at the axial end of the sleeve body 211, and the connecting end cover 212 can be detachably provided.

[0043] It can be understood that the elastic torsion member 23 limits the relative rotation between the valve core 22 and the sleeve body 211, which can be to limit the valve sleeve 21 and the valve core 22 to remain relatively still, or to allow relative rotation between the valve core 22 and the valve sleeve 21, but the relative angular displacement between the valve core 22 and the valve sleeve 21 is limited to a level that does not meet the conditions for opening the digital valve 2.

[0044] In the embodiment of the present invention, the connecting end cover 212 may also be provided on the sleeve body 211 by welding or integral molding. The provision of the connecting end cover 212 may also limit the axial movement of the valve core 22 to a certain extent.

[0045] In the embodiment of the present invention, the elastic torsion member 23 may be an elastic element with elastic deformation capability, such as an elastic torsion bar, a torsion spring, a spiral spring, or a spring.

[0046] Specifically, taking the elastic torsion bar as an example, Figure 1 and Figure 2 As shown, in the embodiment of the present invention, one end of the elastic torsion bar can be fixed on the valve core 22, and the other end can be fixed on the connecting end cover 212. The connection between the elastic torsion bar and the valve core 22 or the connecting end cover 212 can be a keyway connection, a threaded connector connection, a pin connection, etc. The deformation torque of the elastic torsion bar is less than the rated output torque of the driving mechanism 3, so that when the load of the piston rod 11 is large, the power-assisted driving function of the rotary valve type digital cylinder assembly is realized.

[0047] The installation method of the torsion spring is similar to that of the elastic torsion bar, with both ends connected between the valve core 22 and the connecting end cover 212. As for the coil spring and the spring sheet, the coil spring or the spring sheet can be set between the limit ring 242 and the limit block 241, such as set in the limit groove 243.

[0048] like Figure 1 and Figure 2 As shown, in the embodiment of the present invention, the valve sleeve 21 may further include a thrust end cover 213, which is arranged at both ends of the sleeve body 211 opposite to the connecting end cover 212, and the thrust end cover 213 and the connecting end cover 212 are respectively used to limit the axial movement of the valve core 22. By limiting the thrust end cover 213 and the connecting end cover 212, the axial ends of the valve core 22 can be limited to prevent the valve core 22 from axially moving relative to the valve sleeve 21.

[0049] like Figure 1 and Figure 2 As shown, in the embodiment of the present invention, a first lubricating member 25 is provided between the connecting end cover 212 and the axial end surface of the valve core 22, and / or a second lubricating member 26 is provided between the valve core 22 and the thrust end cover 213. The first lubricating member 25 and the second lubricating member 26 can be self-lubricating thrust washers, or structures such as bearings and balls. Taking the lubricating thrust washers as an example, by providing the lubricating thrust washers, the axial force of the valve core 22 during axial movement can be buffered, and the end of the valve core 22 can be prevented from directly contacting the thrust end cover 213 or the connecting end cover 212 to cause dry friction, thereby reducing the wear of the end covers at both ends on the valve core 22.

[0050] The axial force of the axial movement of the valve core 22 will be transmitted to the valve sleeve 21 through the thrust end cover 213 or the connecting end cover 212. In order to offset the axial force of the valve sleeve 21 when it rotates, the digital valve 2 may further include a valve housing 27. The valve housing 27 is used for fixed installation. The valve sleeve 21 is rotatably installed on the valve housing 27. A thrust bearing, such as a thrust needle bearing, a thrust roller bearing, a tapered bearing, etc., may be arranged between the end face of the valve sleeve 21 and the valve housing 27. By arranging the thrust bearing, the axial force of the valve sleeve 21 can be offset.

[0051] like Figure 1 and Figure 2 As shown, in an embodiment of the present invention, the valve sleeve 21 and the valve core 22 can rotate synchronously and continuously as a whole, and can also rotate relative to each other within a certain angle. In order to constrain the relative rotation angle between the valve core 22 and the valve sleeve 21, a limit assembly 24 can be set between the valve core 22 and the valve sleeve 21. By setting the limit assembly 24, the rotation angle travel of the valve core 22 relative to the valve sleeve 21 can be limited.

[0052] In the embodiment of the present invention, there are many arrangements of the limiting assembly 24, such as Figure 2 and Figure 3 As shown, the limit assembly 24 may include a limit block 241 and a limit ring 242. The limit block 241 is arranged on the valve core 22, and the limit ring 242 is a sleeve structure and is arranged on the valve sleeve 21. The limit ring 242 is provided with a limit groove 243 radially aligned with the limit block 241. The length of the limit groove 243 is greater than the limit block 241. The limit block 241 extends into the limit groove 243. When the valve core 22 rotates relative to the valve sleeve 21 at a preset angle, the valve core 22 will abut against the groove wall of the limit groove 243, thereby limiting the valve core 22 from continuing to rotate relative to the valve sleeve 21.

[0053] Of course, the limit block 241 can also be set on the valve sleeve 21, the limit ring 242 can be set on the valve core 22, or the limit assembly 24 can also be limited by the matching of a pin and a socket, and the two limit blocks 241 abutting against each other.

[0054] like Figure 2 and Figure 3 As shown, in an embodiment of the present invention, the driving mechanism 3 may include a coupling assembly 31 and a driving member body 32 , and the output shaft of the driving member body 32 is drivingly connected to the valve core 22 through the coupling assembly 31 .

[0055] Specifically, the driving member body 32 can be a motor, a hydraulic motor, etc., and the motor can be a stepping motor, a servo motor, etc. Taking the motor as an example, according to the different loads of the cylinder body 1, the rotary valve type digital cylinder assembly of the present invention can work in the first working mode and the second working mode respectively. When the load of the piston rod 11 is small, the power output by the motor is transmitted to the piston rod 11 through the coupling assembly 31, the valve core 22, the elastic torsion member 23, the valve sleeve 21, the spiral transmission rod 42, and the nut 41 in sequence to drive the piston rod 11 to extend and retract. At this time, the movement of the piston rod 11 is only driven by the motor, and the hydraulic oil does not participate in the driving of the piston rod 11. The first working mode is pure electric drive.

[0056] When the piston rod 11 is heavily loaded, the power output by the motor will drive the valve core 22 and the valve sleeve 21 to overcome the torque threshold of the elastic torsion member 23, causing the valve core 22 and the valve sleeve 21 to rotate relative to each other. At this time, the hydraulic oil enters the cylinder body 1 to drive the piston rod 11 to move. At the same time, the power output by the motor will also be transmitted to the piston rod 11 through the valve core 22, the elastic torsion member 23, the valve sleeve 21, the spiral transmission rod 42, and the nut 41. Part of the driving force of the piston rod 11 comes from the hydraulic oil, and part comes from the motor. The motor can assist the driving of the piston rod 11, and the rotary valve type digital cylinder assembly is in the second working mode of electro-hydraulic hybrid drive.

[0057] like Figure 2 and Figure 3 As shown, in an embodiment of the present invention, the coupling assembly 31 may include a fork 312 and a cross elastic body 311, one side of the cross elastic body 311 may be mounted on the valve core 22 or the stop block 241 on the valve core 22, and the other side may be connected to the fork 312, the fork 312 is used to be connected to the output shaft of the motor, and the fork 312 and the cross elastic body 311 are driven to rotate by the output shaft of the motor, so as to realize the rotation drive of the valve core 22. By setting the cross elastic body 311, the coaxial assembly error between the motor and the valve core 22 can be eliminated.

[0058] It is understandable that the driving member body 32 can also be connected to the valve core 22 in other ways, such as a plurality of gear transmission connections, coupling connections, etc. The motor can be arranged coaxially with the valve core 22, or can be placed beside or vertically relative to the valve core 22.

[0059] like Figure 1 As shown, in an embodiment of the present invention, the digital valve 2 can be installed outside the cylinder body 12 of the cylinder body 1.

[0060] like Figure 2As shown, in an embodiment of the present invention, an oil inlet port P, an oil return port T, a first working oil port A and a second working oil port B are provided on the valve sleeve 21. The first working oil port A and the second working oil port B are respectively connected to the first cavity 14 and the second cavity 13 of the cylinder body 1 by pipelines. The valve core 22 is used to rotate so that one of the oil inlet port P and the oil return port T is connected to the first working oil port A, and the remaining one of the oil inlet port P and the oil return port T is connected to the second working oil port B.

[0061] Specifically, the oil inlet port P and the oil return port T are used to connect to the pressure oil circuit and the return oil circuit of the hydraulic system respectively. The valve core 22 is provided with a first conduction groove and a second conduction groove. By controlling the valve core 22 to rotate forward or reverse, one of the first conduction groove and the second conduction groove can be connected to the oil inlet port P and the first working oil port A, and the other can be connected to the oil return port T and the second working oil port B. By controlling the valve core 22 to rotate forward or reverse, the extension or retraction of the piston rod 11 can be controlled.

[0062] like Figure 1 As shown, in an embodiment of the present invention, the piston rod 11 is hollow and has an axially extending through channel 111 inside, the opening of the through channel 111 is arranged on the piston of the piston rod 11, the nut 41 is arranged on the opening of the through channel 111, the spiral transmission rod 42 is screwed on the nut 41 and one end extends into the through channel 111, the other end of the spiral transmission rod 42 axially extends out of the end wall of the cylinder body 12 of the cylinder body 1 and is fixedly connected to the valve sleeve 21, and by setting the through channel 111, a movable space is provided for the spiral transmission rod 42.

[0063] In summary, the rotary valve type digital cylinder assembly of the present invention can provide the rotary valve type digital cylinder assembly with two working modes, namely pure motor drive and electro-hydraulic hybrid drive, by setting an elastic torque member 23 between the valve core 22 and the valve sleeve 21 of the digital valve 2, which effectively utilizes the motor power and has a higher overall energy efficiency level. At the same time, the digital valve 2 is set as a rotary valve, and the valve core 22 only needs to rotate a small angle to realize the opening and closing control of the working oil port, with less sliding friction, no redundant friction pairs, and high component reliability. Furthermore, the elastic torque member 23 can also enable the digital valve 2 to have the functions of mid-position fixing and rapid self-return, which not only has better reliability and no risk of erroneous operation, but also has better switching frequency response performance.

[0064] To achieve the above-mentioned objective, an embodiment of the present invention further provides an operating device, wherein the operating device comprises the rotary valve type digital cylinder assembly as described above.

[0065] In some examples, the operating equipment may be new energy equipment, which includes but is not limited to new energy vehicles, new energy vehicle cranes, new energy truck cranes, new energy mixer trucks, new energy pump trucks, new energy fire trucks, new energy road construction vehicles, new energy sanitation vehicles, etc. In addition, the new energy equipment also includes the above-mentioned rotary valve type digital cylinder assembly and a power battery (such as a lithium battery, a hydrogen fuel cell, etc.) that powers the rotary valve type digital cylinder assembly.

[0066] Of course, the working equipment of the present invention can also be a fuel-powered device, which includes a car driven by a fuel engine, a car crane, a truck crane, a mixer truck, a pump truck, a fire truck, a road construction vehicle, a sanitation vehicle, etc., and is not limited thereto. In addition, the fuel-powered device also includes the above-mentioned rotary valve digital cylinder assembly and a generator. When the fuel engine is running, it can drive the generator to run, and then the generator can supply power to the drive mechanism 3 in the rotary valve digital cylinder assembly.

[0067] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0068] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0069] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0070] Although the embodiments of the present invention have been described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A rotary valve type digital cylinder assembly, characterized in that: The rotary valve type digital cylinder assembly comprises: The oil cylinder body (1) comprises a piston rod (11); A digital valve (2), comprising a valve sleeve (21), a valve core (22) and an elastic torsion member (23), wherein the valve core (22) is rotatably disposed in the valve sleeve (21), and the elastic torsion member (23) is disposed between the valve core (22) and the valve sleeve (21); A driving mechanism (3) comprising a motor drivingly connected to the valve core (22), wherein the motor is a servo motor or a stepping motor; A feedback mechanism (4) comprising a nut (41) disposed on the piston rod (11) and a spiral transmission rod (42) threadedly engaged with the nut (41), wherein one end of the spiral transmission rod (42) axially extends out of the oil cylinder body (1) and is fixedly connected to the valve sleeve (21); Wherein, when the load resistance of the piston rod (11) is less than the torque threshold corresponding to the elastic torque member (23), the elastic torque member (23) is used for transmission between the valve sleeve (21) and the valve core (22); and, when the load resistance of the piston rod (11) is greater than the torque threshold, the elastic torque member (23) is used for driving the valve sleeve (21) and the valve core (22) to rotate relative to each other, so as to open the digital valve (2); When the motor stops driving, the piston rod (11) continues to move, driving the spiral transmission rod (42) to rotate via the nut (41), and the rotation of the spiral transmission rod (42) in turn drives the valve sleeve (21) to rotate in the closing direction of the working oil port of the digital valve (2), until the working oil port is gradually closed.

2. The rotary valve type digital cylinder assembly according to claim 1 is characterized in that: The valve sleeve (21) comprises a sleeve body (211) and a connecting end cover (212); the sleeve body (211) is sleeved on the radially outer side of the valve core (22); the connecting end cover (212) is installed on one end of the sleeve body (211) facing the spiral transmission rod (42); the connecting end cover (212) is used for being fixedly connected to the spiral transmission rod (42); the elastic torque member (23) is fixedly connected between the valve core (22) and the connecting end cover (212) and is elastically deformable; the elastic torque member (23) is used for limiting the relative rotation between the valve core (22) and the sleeve body (211) when the torque of the valve core (22) is less than the torque threshold of the elastic torque member (23).

3. The rotary valve type digital cylinder assembly according to claim 2 is characterized in that: The elastic torsion member (23) is one of an elastic torsion bar, a torsion spring, a spiral spring, and a spring.

4. The rotary valve type digital cylinder assembly according to claim 2, characterized in that: The valve sleeve (21) further comprises a thrust end cover (213), the thrust end cover (213) and the connecting end cover (212) being arranged at two ends of the sleeve body (211) opposite to each other, the thrust end cover (213) and the connecting end cover (212) being respectively used to limit the axial movement of the valve core (22).

5. The rotary valve type digital cylinder assembly according to claim 4, characterized in that: A first lubricating member (25) is provided between the connecting end cover (212) and the axial end surface of the valve core (22), and / or a second lubricating member (26) is provided between the valve core (22) and the thrust end cover (213).

6. The rotary valve type digital cylinder assembly according to any one of claims 1 to 5, characterized in that: The digital valve (2) further comprises a limit assembly (24) arranged between the valve core (22) and the valve sleeve (21), wherein the limit assembly (24) is used to limit the relative rotational angle travel between the valve core (22) and the valve sleeve (21).

7. The rotary valve type digital cylinder assembly according to claim 6, characterized in that: The limit assembly (24) comprises a limit block (241) and a limit ring (242); the limit block (241) is arranged on the valve core (22); the limit ring (242) is arranged on the valve sleeve (21) and is provided with a limit groove (243) radially aligned with the limit block (241); the limit block (241) extends into the limit groove (243).

8. The rotary valve type digital cylinder assembly according to any one of claims 1 to 5, characterized in that: The driving mechanism (3) comprises a coupling assembly (31) and a driving member body (32); an output shaft of the driving member body (32) is drivingly connected to the valve core (22) via the coupling assembly (31).

9. The rotary valve type digital cylinder assembly according to any one of claims 1 to 5, characterized in that: The valve sleeve (21) is provided with an oil inlet (P), an oil return port (T), a first working oil port (A) and a second working oil port (B); the first working oil port (A) and the second working oil port (B) are respectively connected to a first cavity (14) and a second cavity (13) of the cylinder body (1); the valve core (22) is used to rotate so that one of the oil inlet (P) and the oil return port (T) is connected to the first working oil port (A), and the remaining one of the oil inlet (P) and the oil return port (T) is connected to the second working oil port (B).

10. The rotary valve type digital cylinder assembly according to any one of claims 1 to 5, characterized in that: An axially extending through-channel (111) is provided in the piston rod (11); an opening of the through-channel (111) is provided on the piston of the piston rod (11); the nut (41) is provided on the opening of the through-channel (111); the spiral transmission rod (42) is screwed onto the nut (41) and one end thereof extends into the through-channel (111); the other end of the spiral transmission rod (42) axially extends out of the end wall of the cylinder body (12) of the oil cylinder body (1) and is fixedly connected to the valve sleeve (21).

11. An operating device, characterized in that: It comprises a rotary valve type digital cylinder assembly according to any one of claims 1 to 10.

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