Rotary valve type digital cylinder assembly and operation apparatus

Abstract

The present application belongs to the technical field of mechanical apparatuses. Provided are a rotary valve type digital cylinder assembly and an operation apparatus. The rotary valve type digital cylinder assembly comprises an oil cylinder body, a digital valve, a driving mechanism and a feedback mechanism, wherein a piston rod is provided in the oil cylinder body; the digital valve comprises a valve sleeve, a valve core and an elastic torque member, wherein the elastic torque member is arranged between the valve core and the valve sleeve; the driving mechanism is drivingly connected to the valve core; the feedback mechanism comprises a nut arranged on the piston rod and a spiral transmission rod in threaded fit with the nut, wherein one end of the spiral transmission rod axially extends out of the oil cylinder body and is fixedly connected to the valve sleeve; and the elastic torque member is configured to keep the valve sleeve and the valve core relatively stationary when the load resistance of the piston rod is less than a torque threshold corresponding to the elastic torque member, and 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 providing the elastic torque member between the valve core and the valve sleeve of the digital valve, the power of the driving mechanism can be fully utilized.

Description

Rotary valve digital cylinder assembly and working device

[0001] Cross-reference to Related Applications

[0002] This application claims the benefit of Chinese Patent Application No. 202411340752.2, filed September 25, 2024, the contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application belongs to the technical field of mechanical equipment, and specifically relates to a rotary valve digital cylinder assembly and working device. BACKGROUND

[0004] In industrial scenarios requiring high-precision control, digital cylinders are increasingly favored due to their high control precision and strong control robustness. A digital cylinder is typically composed of a digital hydraulic valve and a mechanical position feedback oil cylinder. The digital hydraulic valve is usually a spool valve, and some technologies use rotary valves. During the operation of the digital cylinder, a stepper motor outputs a control command, and the digital valve converts the motor command into linear motion or rotary motion of the valve core, controlling the operation of the hydraulic cylinder. At the same time, the hydraulic cylinder mechanical feedback structure gradually closes the valve port during the movement of the oil cylinder, thereby achieving high-precision digital pulse control of the oil cylinder position.

[0005] A rotary valve digital oil cylinder is disclosed in Chinese Patent CN112664500A. In this oil cylinder, a servo motor E is connected to a valve core A, a ball screw D is connected to a valve sleeve B, and the ball screw D is also connected to an oil cylinder piston F. The piston F of the oil cylinder C drives the valve sleeve B to rotate in the same direction and at the same speed as the servo motor E. When the servo motor E drives the cross slider coupling G at the required speed, thereby driving the valve core A to rotate by a certain angle, the rotary valve port opens, the oil pressure gradually rises, and the piston F in the oil cylinder C advances or retreats, the movement of the piston F further drives the feedback nut H of the ball screw D to advance or retreat, the movement of the feedback nut H drives the screw rod of the ball screw D to rotate forward or reverse, and the rotation of the screw rod drives the valve sleeve B to move in the same direction as the servo motor E, so that the valve sleeve B runs 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.

[0006] In this type of rotary valve digital oil cylinder, the motor is only a control element and can only control the on-off of the hydraulic valve, resulting in ineffective utilization of the motor's own power and low energy efficiency. SUMMARY

[0007] To overcome the above-mentioned defects or shortcomings, the present application provides a rotary valve digital cylinder assembly and working device, which aims to solve the technical problem that the existing rotary valve digital cylinder cannot effectively utilize the motor's own power and has low energy efficiency.

[0008] To achieve the above object, the application provides a rotary valve type digital cylinder assembly, which comprises a cylinder body, a digital valve, a driving mechanism and a feedback mechanism, the cylinder body is internally provided with a piston rod, the digital valve comprises a valve sleeve, a valve core and an elastic torsion piece, the valve core is rotationally arranged in the valve sleeve, the elastic torsion piece is arranged between the valve core and the valve sleeve, the driving mechanism is in transmission connection with the valve core, the feedback mechanism comprises a nut arranged on the piston rod and a screw transmission rod in screw joint with the nut, one end of the screw 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 a torque threshold value corresponding to the elastic torsion piece, the elastic torsion piece 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 piece, the elastic torsion piece is used to drive the valve sleeve and the valve core to relatively rotate to open the digital valve.

[0009] In the embodiment of the application, the valve sleeve comprises a sleeve body and a connecting end cover, the sleeve body is sleeved on the radial outside of the valve core, the connecting end cover is installed at one end of the sleeve body towards the screw transmission rod, the connecting end cover is used for fixed connection with the screw 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 a torque threshold value of the elastic torsion piece.

[0010] In the embodiment of the application, the elastic torsion piece is one of an elastic torsion rod, a torsion spring, a spiral spring and a spring sheet.

[0011] In the embodiment of the application, the valve sleeve further comprises a thrust end cover, the thrust end cover 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.

[0012] In the embodiment of the application, a first lubricating piece is arranged between the connecting end cover and the axial end surface of the valve core, and / or a second lubricating piece is arranged between the valve core and the thrust end cover.

[0013] In the embodiment of the application, the digital valve further comprises a limiting assembly arranged between the valve core and the valve sleeve, the limiting assembly is used to limit the relative rotation angle stroke between the valve core and the valve sleeve.

[0014] In the embodiment of the application, the limiting assembly comprises a limiting block and a limiting ring, the limiting block is arranged on the valve core, the limiting ring is arranged on the valve sleeve and is provided with a limiting groove radially aligned with the limiting block, and the limiting block extends into the limiting groove.

[0015] In the embodiment of the application, the driving mechanism comprises a shaft coupling assembly and a driving piece body, an output shaft of the driving piece body is in transmission connection with the valve core through the shaft coupling assembly.

[0016] In the embodiment of the present application, the valve sleeve is provided with an oil inlet, an oil return, a first working oil port and a second working oil port, the first working oil port and the second working oil port are connected to the first cavity and the second cavity of the oil cylinder body respectively, and the valve core is used for rotating to make one of the oil inlet and the oil return communicate with the first working oil port and make the other of the oil inlet and the oil return communicate with the second working oil port.

[0017] In the embodiment of the present application, the piston rod is provided with an axially extending through channel, the opening of the through channel is arranged on the piston of the piston rod, a nut is arranged on the opening of the through channel, a screw transmission rod is screwed on the nut and one end of the screw transmission rod extends into the through channel, and the other end of the screw transmission rod extends axially out of the end wall of the cylinder body of the oil cylinder body and is fixedly connected with the valve sleeve.

[0018] To achieve the above object, the present application further provides a working equipment, wherein the working equipment comprises the rotary valve type digital cylinder assembly according to the above.

[0019] Through the above technical solution, the rotary valve type digital cylinder assembly provided by the embodiment of the present application has the following beneficial effects:

[0020] The rotary valve type digital cylinder assembly of the present application sets 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 together with the valve core under the action of the elastic torsion piece, so that the screw transmission rod and the nut can be converted into the extension and retraction drive of the piston rod under the transmission, in this case, the movement of the piston rod is driven 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, the valve core and the valve sleeve appear relative rotation to make the digital valve open, which is helpful for the external hydraulic oil to enter the oil cylinder body through the digital valve, thereby driving the piston rod to move, at this time, the driving force of the piston rod is partly derived from the hydraulic oil and partly derived from the driving mechanism. The driving mechanism participates in the driving of the piston rod in the above two working conditions, so that the power of the driving mechanism is fully utilized. In addition, when the valve sleeve and the valve core appear relative angular displacement and the valve sleeve is reset under the drive of the screw 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 function of fast self-reset. Further, in the stop state, the elastic force of the elastic torsion piece can lock the valve core at the cut-off position of the working oil port, thereby avoiding the interference of external disturbance on the digital valve and realizing the function of mid-position fixation.

[0021] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:

[0023] Fig. 1 is a structural schematic diagram of a rotary valve digital cylinder assembly according to an embodiment of the application;

[0024] Fig. 2 is a sectional structural schematic diagram of a digital valve according to an embodiment of the application;

[0025] Fig. 3 is a structural schematic diagram of the inside of a digital valve according to an embodiment of the application.

[0026] The reference signs are explained as follows: 1, cylinder body; 11, piston rod; 111, through channel; 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 torsion piece; 24, limiting assembly; 241, limiting block; 242, limiting ring; 243, limiting groove; 25, first lubricating piece; 26, second lubricating piece; 27, valve shell; 3, driving mechanism; 31, shaft connecting assembly; 311, cross elastic body; 312, yoke; 32, driving piece 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

[0027] The specific embodiments of the application are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and explanatory and are not intended to limit the application.

[0028] The rotary valve digital cylinder assembly of the application is described below with reference to the accompanying drawings.

[0029] The application provides a rotary valve digital cylinder assembly, as shown in Figs. 1 and 2, which comprises:

[0030] The cylinder body 1 comprises a cylinder body 12 and a piston rod 11.

[0031] The digital valve 2 is a rotary valve and comprises a valve sleeve 21, a valve core 22 and an elastic torsion piece 23, the valve core 22 is rotationally arranged in the valve sleeve 21, and the elastic torsion piece 23 is arranged between the valve core 22 and the valve sleeve 21.

[0032] The driving mechanism 3 is in driving connection with the valve core 22 and is used to drive the valve core 22 to rotate.

[0033] The feedback mechanism 4 comprises a nut 41 arranged on the piston rod 11 and a screw transmission rod 42 in threaded engagement with the nut 41, one end of the screw transmission rod 42 penetrating the nut 41 and the other end extending axially out of the cylinder body 1 and fixedly connected with the valve sleeve 21.

[0034] Wherein, when the load resistance of the piston rod 11 is less than the torque threshold of the elastic torsion member 23, the elastic torsion 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 torsion member 23, the elastic torsion member 23 is used to drive the relative rotation of the valve sleeve 21 and the valve core 22 to open the digital valve.

[0035] The axial direction of the cylinder body 1 is the same as the extension direction of the piston rod 11, when the piston rod 11 extends and retracts, the nut 41 can drive the screw transmission rod 42 to rotate, and vice versa, when the screw transmission rod 42 rotates, because its axial position is fixed, it can also drive the piston rod 11 to move through the nut 41.

[0036] 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 pass through the digital valve 2 to the cylinder body 1, and when the digital valve 2 is closed, the external hydraulic oil is mutually cut off 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, limiting the relative rotation therebetween, for example, making the valve core 22 and the valve sleeve 21 relatively stationary, or making the valve core 22 and the valve sleeve 21 have relative rotation but not reach the relative angular displacement that opens the digital valve 2; in the case of high load resistance, the elastic torsion member 23 deforms elastically, and the valve core 22 and the valve sleeve 21 have a large relative angular displacement, thereby opening the digital valve 2.

[0037] The high and low of the load resistance is relative to the torque threshold of the elastic torsion member 23, to some extent, the torque threshold refers to the minimum torque required for the elastic torsion member 23 to deform elastically 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 torsion member 23 to deform, so that the valve sleeve 21 and the valve core 22 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 through the transmission of the elastic torsion member 23, the relative rotation between the valve core 22 and the valve sleeve 21 is limited, and the digital valve 2 is closed. By arranging the elastic torsion member 23 between the valve sleeve 21 and the valve core 22, the rotary valve type digital cylinder assembly of the present application can have a first working mode and a second working mode.

[0038] As shown in FIG. 1 and FIG. 2, when the driving mechanism 3 drives the valve core 22 to rotate, if the load of the piston rod 11 is small, the torsional resistance between the valve core 22 and the valve sleeve 21 is less than the torque threshold, and under the action of the elastic torsion piece 23 between the valve core 22 and the valve sleeve 21, the valve sleeve 21 will rotate with the valve core 22. Due to the low load of the oil cylinder body 1, the torque of the driving mechanism 3 can be converted into the extension and retraction driving force of the piston rod 11 through the transmission of the screw 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 torsion piece 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 turned on, the hydraulic oil does not participate in the driving of the oil cylinder body 1, and the driving of the piston rod 11 is only driven by the driving mechanism 3. The rotary valve type digital cylinder assembly is in the first working mode.

[0039] When the driving mechanism 3 drives the valve core 22 to rotate, if the load of the piston rod 11 is large, the torsional resistance between the valve core 22 and the valve sleeve 21 is greater than the torque threshold, and the rotation of the valve core 22 will force the elastic torsion piece 23 to produce elastic deformation, and at this time, a large relative angular displacement occurs between the valve core 22 and the valve sleeve 21. Through the relative movement of the valve core 22, the digital valve can be opened, the working oil port on the valve sleeve 21 is switched from the cut-off state to the in-out hydraulic oil state, the working oil port is turned on, and the external hydraulic oil will enter one of the working chambers of the oil cylinder body 1 through the working oil port, and the hydraulic oil in the other working chamber will also be returned through the working oil port for oil return. The piston rod 11 can be driven to move by the pressure oil. In this case, the driving force of the piston rod 11 is partly derived from the hydraulic oil and partly from the driving mechanism 3, the driving mechanism 3 can assist the driving of the piston rod 11, and the rotary valve type digital cylinder assembly is in the second working mode.

[0040] In the second working mode, when the driving mechanism 3 stops driving, the continuous movement of the piston rod 11 will drive the screw transmission rod 42 to rotate through the nut 41, and the rotation of the screw transmission rod 42 will in turn drive the valve sleeve 21 to rotate in the closing direction of the working oil port (the reset direction of the elastic torsion piece 23), until the working oil port is gradually closed. Through the screw transmission rod 42 and the nut 41, the negative feedback control of the rotary valve type digital cylinder assembly can be realized. During the closing process of the working oil port, the reset elastic force of the elastic torsion piece 23 can accelerate the reset speed of the valve sleeve 21, thereby improving the switching frequency response of the digital valve 2. When the oil cylinder is in a stopped state, the elastic torsion piece 23 can also lock the valve core 22 in the middle position (the cut-off position of the working oil port), thereby avoiding the interference of external disturbances on the digital valve 2 and avoiding the misoperation of the digital valve 2.

[0041] In summary, the oil cylinder assembly sets the elastic torsion piece 23 between the valve core 22 and the valve sleeve 21 of the digital valve 2, so that the rotary valve type digital cylinder assembly has the first working mode and the second working mode, the power of the driving mechanism 3 is fully utilized, the energy efficiency ratio of the oil cylinder assembly is increased, the digital valve 2 has the functions of mid-position fixation and rapid self-return, the working reliability and dynamic performance of the digital valve 2 are increased, and the frequency response of the digital valve 2 is improved.

[0042] In the embodiment of the present application, the nut 41 can be a ball nut 41, and the screw transmission rod 42 can be a ball screw or a ball screw rod. By arranging the ball, the transmission resistance between the nut 41 and the screw transmission rod 42 can be reduced.

[0043] As shown in FIGS. 1 and 2, in the embodiment of the present application, 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 piece 23. The connecting end cover 212 is detachably installed on one end of the sleeve body 211 facing the screw transmission rod 42. One side of the connecting end cover 212 is provided with a mounting cavity 212a for fixed connection with the screw transmission rod 42, and the other side is arranged towards the axial end face of the valve core 22. The elastic torsion piece 23 is fixedly connected between the valve core 22 and the connecting end cover 212 and can be elastically deformed. The elastic torsion piece 23 is configured to be elastically deformed when the torque between the valve core 22 and the valve sleeve 21 is greater than a preset value. By arranging the elastic torsion piece 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 piece 23. In order to avoid oil leakage of the working oil port of the valve sleeve 21, the valve sleeve 21 and the valve core 22 need to be tightly sleeved. In order to facilitate the installation of the elastic torsion piece 23, the connecting end cover 212 can be arranged on the axial end of the sleeve body 211 and detachably arranged.

[0044] It can be understood that the elastic torsion piece 23 limiting the relative rotation between the valve core 22 and the sleeve body 211 can be to keep the valve sleeve 21 and the valve core 22 relatively stationary, or to allow the 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 within the opening condition of the digital valve 2.

[0045] In the embodiment of the present application, the connecting end cover 212 can also be arranged on the sleeve body 211 by welding or integral molding. The arrangement of the connecting end cover 212 can also limit the axial movement of the valve core 22 to a certain extent.

[0046] In the embodiment of the present application, the elastic torsion piece 23 can be an elastic torsion rod, a torsion spring, a coil spring, a spring sheet, or other elastic elements with elastic deformation capability.

[0047] Specifically, taking the elastic torsion bar as an example, as shown in FIG. 1 and FIG. 2, in the embodiment of the present application, 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, and the connection form of the elastic torsion bar with the valve core 22 or the connecting end cover 212 can be a key groove connection, a threaded connection, a pin shaft connection, etc. The deformation torque of the elastic torsion bar is smaller than the rated output torque of the driving mechanism 3, so as to realize the power-assisted driving function of the rotary valve type digital cylinder assembly when the load of the piston rod 11 is large.

[0048] The installation mode of the torsion spring is similar to that of the elastic torsion bar, and the two ends are connected between the valve core 22 and the connecting end cover 212, while for the coil spring and the elastic sheet, the coil spring or the elastic sheet can be arranged between the limiting ring 242 and the limiting block 241, such as in the limiting groove 243.

[0049] As shown in FIG. 1 and FIG. 2, in the embodiment of the present application, the valve sleeve 21 can also include a thrust end cover 213, which is arranged at the two 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. Through the limiting of the thrust end cover 213 and the connecting end cover 212, the axial ends of the valve core 22 can be limited, so as to avoid the axial movement of the valve core 22 relative to the valve sleeve 21.

[0050] As shown in FIG. 1 and FIG. 2, in the embodiment of the present application, a first lubricating member 25 is arranged between the connecting end cover 212 and the axial end face of the valve core 22, and / or a second lubricating member 26 is arranged 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 can be structures such as bearings, balls, etc. Taking the lubricating thrust washer as an example, by arranging the lubricating thrust washer, the axial force when the valve core 22 axially moves can be buffered, and direct contact between the end of the valve core 22 and the thrust end cover 213 or the connecting end cover 212 to cause dry friction can be avoided, so as to reduce the wear of the valve core 22 by the two end covers.

[0051] The axial force of the axial movement of the valve core 22 can 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 when the valve sleeve 21 rotates, the digital valve 2 can also include a valve housing 27, the valve sleeve 21 is rotatably installed on the valve housing 27, and a thrust bearing such as a thrust needle bearing, a thrust roller bearing, a tapered bearing, etc. can be arranged between the end face of the valve sleeve 21 and the valve housing 27, so as to offset the axial force of the valve sleeve 21.

[0052] As shown in FIG. 1 and FIG. 2, in the embodiment of the present application, the valve sleeve 21 and the valve core 22 can be synchronously and continuously rotated as a whole, and can also be relatively rotated within a certain angle. In order to constrain the relative rotation angle between the valve core 22 and the valve sleeve 21, a limiting assembly 24 can be arranged between the valve core 22 and the valve sleeve 21. By arranging the limiting assembly 24, the rotation angle stroke of the valve core 22 relative to the valve sleeve 21 can be limited.

[0053] In the embodiment of the present application, the limiting assembly 24 can have many arrangement forms. As shown in FIG. 2 and FIG. 3, the limiting assembly 24 can include a limiting block 241 and a limiting ring 242. The limiting block 241 is arranged on the valve core 22, and the limiting ring 242 is in the form of a sleeve ring and is arranged on the valve sleeve 21. The limiting ring 242 is provided with a limiting groove 243 radially aligned with the limiting block 241. The length of the limiting groove 243 is greater than that of the limiting block 241. When the valve core 22 rotates relative to the valve sleeve 21 by a preset angle, the valve core 22 will abut against the groove wall of the limiting groove 243, so as to limit the valve core 22 from continuously rotating relative to the valve sleeve 21.

[0054] Of course, the limiting block 241 can also be arranged on the valve sleeve 21, and the limiting ring 242 can be arranged on the valve core 22. Alternatively, the limiting assembly 24 can limit in the form of a bolt and a hole, or two limiting blocks 241 abutting against each other.

[0055] As shown in FIG. 2 and FIG. 3, in the embodiment of the present application, the driving mechanism 3 can include a shaft coupling assembly 31 and a driving member body 32. The output shaft of the driving member body 32 is drivingly connected to the valve core 22 through the shaft coupling assembly 31.

[0056] Specifically, the driving member body 32 can be an electric motor, a hydraulic motor, etc. The electric motor can be a stepper motor, a servo motor, etc. Taking the electric motor as an example, according to different loads of the oil cylinder body 1, the rotary valve type digital cylinder assembly of the present application can work in a first working mode and a second working mode. When the load of the piston rod 11 is small, the power output by the electric motor is transmitted to the piston rod 11 through the shaft coupling assembly 31, the valve core 22, the elastic torsion member 23, the valve sleeve 21, the screw transmission rod 42 and the nut 41, so as to drive the piston rod 11 to extend or retract. At this time, the movement of the piston rod 11 is only driven by the electric motor, and the hydraulic oil does not participate in the driving of the piston rod 11. The first working mode is pure electric driving.

[0057] When the piston rod 11 is under heavy load, the power output by the motor can drive the valve core 22 and the valve sleeve 21 to overcome the torque threshold of the elastic torsion piece 23, so that the valve core 22 and the valve sleeve 21 rotate relatively, at this time, the hydraulic oil enters the oil cylinder body 1 to drive the piston rod 11 to move, and at the same time, the power output by the motor is also transmitted to the piston rod 11 through the valve core 22, the elastic torsion piece 23, the valve sleeve 21, the spiral transmission rod 42 and the nut 41. The driving force of the piston rod 11 is partly derived from the hydraulic oil and partly from the motor. The motor can assist the driving of the piston rod 11. The rotary valve type digital cylinder assembly is in the second working mode of electro-hydraulic hybrid driving.

[0058] As shown in FIGS. 2 and 3, in the embodiment of the present application, the shaft coupling assembly 31 can include a pull fork 312 and a cross elastic body 311. One side of the cross elastic body 311 can be mounted on the valve core 22 or the limiting block 241 on the valve core 22, and the other side can be connected with the pull fork 312. The pull fork 312 is used to be connected with the output shaft of the motor, and the pull fork 312 and the cross elastic body 311 are driven to rotate by the output shaft of the motor, so that the rotary drive of the valve core 22 can be realized. By arranging the cross elastic body 311, the coaxial assembly error between the motor and the valve core 22 can be eliminated.

[0059] It can be understood that the driving member body 32 can also be in transmission connection with the valve core 22 in other forms, such as gear transmission connection, shaft coupling connection, etc. The motor can be coaxially arranged with the valve core 22, or can be placed beside or vertically relative to the valve core 22, etc.

[0060] As shown in FIG. 1, in the embodiment of the present application, the digital valve 2 can be mounted outside the cylinder body 12 of the oil cylinder body 1.

[0061] As shown in FIG. 2, in the embodiment of the present application, the valve sleeve 21 is provided with an oil inlet port 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 the first cavity 14 and the second cavity 13 of the oil cylinder body 1 by pipelines. The valve core 22 is used to rotate to make one of the oil inlet port P and the oil return port T communicate with the first working oil port A, and the remaining one of the oil inlet port P and the oil return port T communicate with the second working oil port B.

[0062] Specifically, the oil inlet port P and the oil return port T are respectively used to be connected with the pressure oil circuit of the hydraulic system and the oil return circuit of the hydraulic system. The valve core 22 is provided with a first through groove and a second through groove. By controlling the forward rotation or reverse rotation of the valve core 22, one of the first through groove and the second through groove can be made to communicate the oil inlet port P and the first working oil port A, and the other one can be made to communicate the oil return port T and the second working oil port B. By controlling the forward rotation or reverse rotation of the valve core 22, the control of the extension or retraction of the piston rod 11 can be realized.

[0063] As shown in FIG. 1, in the embodiment of the present application, the piston rod 11 is hollow and internally provided with an axially extending through channel 111, 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 screw transmission rod 42 is screwed on the nut 41 and one end thereof extends into the through channel 111, the other end of the screw 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 with the valve sleeve 21, by arranging the through channel 111, the screw transmission rod 42 is provided with a space for movement.

[0064] In summary, the rotary valve type digital cylinder assembly of the present application can have two working modes of pure motor driving and electro-hydraulic hybrid driving by arranging the elastic torsion member 23 between the valve core 22 and the valve sleeve 21 of the digital valve 2, the motor power is effectively utilized, and the overall energy efficiency level is higher. At the same time, the digital valve 2 is arranged as a rotary valve, the valve core 22 only needs to be rotated by a small angle to realize the opening and closing control of the working oil port, the sliding friction is small, there is no redundant friction pair, and the element reliability is high. Furthermore, the elastic torsion member 23 can also make the digital valve 2 have the functions of mid-position fixation and rapid self-return, which not only has better reliability and no risk of misoperation, but also has better reversing frequency response performance.

[0065] To achieve the above-mentioned purpose, the embodiment of the present application also provides a working equipment, wherein the working equipment comprises the rotary valve type digital cylinder assembly according to the above.

[0066] In some examples, the working equipment can be a new energy equipment, which includes but is not limited to a new energy vehicle, a new energy vehicle crane, a new energy truck crane, a new energy mixer truck, a new energy pump truck, a new energy fire fighting truck, a new energy road construction vehicle, a new energy sanitation vehicle, 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.) for supplying power to the rotary valve type digital cylinder assembly.

[0067] Of course, the working equipment of the present application can also be a fuel-powered equipment, which includes a vehicle, a vehicle crane, a truck crane, a mixer truck, a pump truck, a fire fighting truck, a road construction vehicle, a sanitation vehicle, etc. driven by a fuel engine, and is not limited thereto. In addition, the fuel-powered equipment also includes the above-mentioned rotary valve type 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 driving mechanism 3 in the rotary valve type digital cylinder assembly.

[0068] In the description of the application, it should be understood that the terms "first", "second" are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0069] In this application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and other terms should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection or communication with each other; it can be directly connected, or indirectly connected through intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0070] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" 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 application. In this specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0071] Although the embodiments of the application have been described above, it can be understood that the above embodiments are exemplary and cannot be construed as limiting the application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the application.

Claims

1. A rotary valve digital cylinder assembly, comprising: a cylinder body (1) comprising a piston rod (11); a digital valve (2) comprising a valve sleeve (21), a valve core (22) rotatably arranged in the valve sleeve (21), and an elastic torsion member (23) arranged between the valve core (22) and the valve sleeve (21); a driving mechanism (3) in driving connection with the valve core (22); a feedback mechanism (4) comprising a nut (41) arranged on the piston rod (11) and a screw transmission rod (42) in threaded connection with the nut (41), one end of the screw transmission rod (42) axially extending out of the cylinder body (1) and fixedly connected with the valve sleeve (21); wherein, when a load resistance of the piston rod (11) is less than a torque threshold of the elastic torsion member (23), the elastic torsion 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 torsion member (23) is used for driving the valve sleeve (21) and the valve core (22) to rotate relatively to open the digital valve (2).

2. The rotating valve digital tank assembly of claim 1, wherein, the valve sleeve (21) comprises a sleeve body (211) sleeved on a radial outer side of the valve core (22) and a connecting end cover (212) mounted on one end of the sleeve body (211) facing the screw transmission rod (42), the connecting end cover (212) is used for fixedly connecting with the screw transmission rod (42), the elastic torsion member (23) is fixedly connected between the valve core (22) and the connecting end cover (212) and can be elastically deformed, and the elastic torsion member (23) is used for limiting relative rotation between the valve core (22) and the sleeve body (211) when a torque of the valve core (22) is less than the torque threshold of the elastic torsion member (23).

3. The rotating valve digital tank assembly of claim 2, wherein, the elastic torsion member (23) is one of an elastic torsion rod, a torsion spring, a helical spring, and a spring sheet.

4. The rotary valve digital cylinder assembly according to claim 2, the valve sleeve (21) further comprising a thrust end cover (213) oppositely arranged on both ends of the sleeve body (211) with the connecting end cover (212), the thrust end cover (213) and the connecting end cover (212) are respectively used for limiting axial movement of the valve core (22).

5. The rotating valve digital tank assembly of claim 4, wherein, a first lubricating member (25) is arranged between the connecting end cover (212) and an axial end surface of the valve core (22), and / or a second lubricating member (26) is arranged between the valve core (22) and the thrust end cover (213).

6. The rotary valve digital cylinder assembly according to any one of claims 1 to 5, wherein the digital valve (2) further comprises a limiting assembly (24) arranged between the spool (22) and the valve sleeve (21), the limiting assembly (24) being configured to limit the relative rotation angle stroke between the spool (22) and the valve sleeve (21).

7. The rotating valve digital tank assembly of claim 6, wherein, The limiting assembly (24) comprises a limiting block (241) arranged on the spool (22) and a limiting ring (242) arranged on the valve sleeve (21) and provided with a limiting groove (243) radially aligned with the limiting block (241), the limiting block (241) extending into the limiting groove (243).

8. The rotating valve digital tank assembly of any of claims 1-5, wherein, The driving mechanism (3) comprises a shaft coupling assembly (31) and a driving member body (32), an output shaft of the driving member body (32) being drivingly connected to the spool (22) through the shaft coupling assembly (31).

9. The rotating valve digital tank assembly of any of claims 1-5, wherein, The valve sleeve (21) is provided with an inlet oil port (P), a return oil 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) being connected to the first cavity (14) and the second cavity (13) of the oil cylinder body (1) respectively, the spool (22) being configured to rotate to make one of the inlet oil port (P) and the return oil port (T) communicate with the first working oil port (A) and make the remaining one of the inlet oil port (P) and the return oil port (T) communicate with the second working oil port (B).

10. The rotary valve digital cylinder assembly of any of claims 1-5, wherein, The piston rod (11) is provided with an axially extending through channel (111), the opening of the through channel (111) being arranged on the piston of the piston rod (11), the nut (41) being arranged on the opening of the through channel (111), the screw transmission rod (42) being screwed on the nut (41) and having one end extending into the through channel (111), the other end of the screw transmission rod (42) extending axially out of the end wall of the cylinder body (12) of the oil cylinder body (1) and being fixedly connected to the valve sleeve (21).

11. A working device comprising the rotary valve digital cylinder assembly according to any one of claims 1 to 10.

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