Lifting electric cylinder capable of storing and releasing return energy

Abstract

The utility model relates to a lifting electric cylinder capable of storing and releasing return energy, which comprises a motor, an energy recovery device, a transmission unit and a load connecting unit, the energy recovery device comprises a gear reducer and a torque storing and releasing device, and the transmission unit comprises a lead screw, a nut pair and a first outer spline shaft. The load connecting unit is connected with the nut pair and can reciprocate along with the nut pair, the first outer spline shaft is installed at the tail end of the lead screw, the torque storing and releasing device comprises a second outer spline shaft, the gear reducer at least comprises a first-stage gear shaft and a last-stage gear shaft, and the first-stage gear shaft is connected with the second-stage gear shaft. The first-stage gear shaft is in transmission connection with a motor shaft of the motor, the last-stage gear shaft is a hollow inner spline shaft, one side of the inner spline shaft is meshed with the first outer spline shaft, and the other side of the inner spline shaft is meshed with the second outer spline shaft. The energy recovery device can recover energy when the push rod returns, and the recovered energy is used for assisting the starting process of the electric cylinder.

Description

Technical Field

[0001] The utility model relates to a lifting electric cylinder capable of storing and releasing return energy, belonging to the technical field of electric cylinders. Background Art

[0002] As a transmission product that integrates a motor and a lead screw pair, the electric cylinder can convert the motor's rotational motion into the telescopic motion of the push rod, thereby driving the load to rise and fall. It has the characteristics of light size, fast response, high reliability and simple maintenance, so it has been widely used in heavy-load lifting equipment such as aerial work platforms, loading engineering machinery, tension and compression testing machines, etc.

[0003] In these application scenarios, electric cylinders often need to bear large loads and generate sufficient thrust to overcome the gravity of the load when working. At the same time, due to the frequent lifting and lowering of the aerial work platform, the push rod of the electric cylinder frequently switches between the lift and return strokes. When the push rod lifts and restarts, the electric cylinder not only needs to overcome the gravity of the load, but also needs to deal with the inertia at startup, which requires the motor to have not only a large rated torque, but also be able to provide sufficient instantaneous starting torque. However, this phenomenon may cause the electric cylinder to slow down or fail to start normally, thereby affecting its working efficiency and performance.

[0004] In the field, mechanical equipment such as aerial work platforms usually rely on rechargeable batteries as a power source, but the battery life is limited. When the electric cylinder push rod is lifted and returned, whether the push rod is extended or retracted, the electric cylinder needs to draw energy from the battery to overcome the load gravity and starting inertia. This will undoubtedly consume a lot of electricity, resulting in a shortened battery life after a single charge, reduced performance and life, and thus increasing the overall cost of the electric cylinder.

[0005] However, the electric cylinders currently on the market are not equipped with energy recovery devices for the load gravitational potential energy and kinetic energy during the push rod's return stroke, nor do they use the recovered energy to drive the push rod's lift. This not only affects the performance of the electric cylinder, but also causes a lot of energy waste. Utility Model Content

[0006] The purpose of the utility model is to provide a new technical solution to improve or solve the technical problems existing in the prior art as described above.

[0007] The technical solution provided by the utility model is as follows: A lifting electric cylinder with return energy storage and release, comprising a motor capable of forward and reverse rotation, an energy recovery device, a transmission unit and a load connection unit, the energy recovery device comprising a gear reducer and a torque storage and release device, the transmission unit comprising a lead screw, a nut pair connected to the lead screw and a first external spline shaft, the load connection unit is connected to the nut pair and can reciprocate with the nut pair, the first external spline shaft is located at the end of the lead screw, the torque storage and release device comprises a second external spline shaft, the gear reducer comprises at least a first-stage gear shaft and a final-stage gear shaft, the first-stage gear shaft is transmission-connected to the motor shaft of the motor, the final-stage gear shaft is a hollow internal spline shaft, one side of the internal spline shaft is meshed with the first external spline shaft, and the other side of the internal spline shaft is meshed with the second external spline shaft.

[0008] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0009] 1. The utility model discloses a lifting electric cylinder with return energy storage and release, wherein the gear reducer has the functions of transmitting torque, decelerating in the forward direction, and accelerating in the reverse direction; the overspeed clutch can limit the maximum rotation speed of the lead screw when the electric cylinder fails to return normally due to power failure, thereby playing a safety protection role; the torque storage and release device can store the initial torsional kinetic energy of the lead screw in the form of torsional elastic potential energy when the electric cylinder returns, and release the torsional elastic potential energy back to the lead screw in the reverse direction and instantly during lifting, so as to increase the starting speed and acceleration of the electric cylinder. The electric cylinder of the utility model can be safer and more stable during the starting and running process, avoiding the problem of starting failure or unstable operation caused by insufficient starting torque, thereby improving the reliability and stability of the electric cylinder.

[0010] 2. The utility model connects the lead screw, the torque storage device and the gear reducer through the final gear shaft of the gear reducer, which can not only transmit the torque of the motor to the lead screw to drive the lead screw to rotate, but also when the lead screw is subjected to the reverse torque generated by the load gravity, the final gear shaft can transmit this torque to the reducer and the torque storage device to recover and store energy. When the electric cylinder needs to return or lift again, the final gear shaft can also reversely transfer the elastic potential energy stored in the torque storage device to the lead screw to achieve instantaneous release of energy, thereby improving the efficiency and performance of the entire system.

[0011] On the basis of the above technical solution, the present invention can also be improved as follows.

[0012] Further, the torque storage and release device includes a gear box, a first fixed gear shaft, a second fixed gear shaft, a coil spring gear shaft, a movable tightening gear shaft and a movable reversing gear shaft, the first fixed gear shaft, the second fixed gear shaft, the coil spring gear shaft, the movable tightening gear shaft and the movable reversing gear shaft are provided with a transmission gear set, the coil spring gear shaft is provided with a coil spring, the first fixed gear shaft, the second fixed gear shaft and the coil spring gear shaft are all installed in the gear box in a manner that they can rotate around an axis, a long arc track hole is provided on the gear box, the movable tightening gear shaft and the movable reversing gear shaft are both installed in their respective long arc track holes, and when the movable tightening gear shaft and the movable reversing gear shaft move along their respective long arc track holes, the gears on the movable tightening gear shaft and the movable reversing gear shaft can enter or disengage from the meshing transmission with the transmission gear set.

[0013] The beneficial effect of adopting the above further scheme is that when the gear on the movable tightening gear shaft enters into meshing transmission with the transmission gear set, the gear on the movable reverse gear shaft disengages from the meshing transmission with the transmission gear set, and the coil spring on the coil spring gear shaft is tightened and stores elastic potential energy. When the gear on the movable reverse gear shaft enters into meshing transmission with the transmission gear set, the gear on the movable tightening gear shaft disengages from the meshing transmission with the transmission gear set, and the coil spring on the coil spring gear shaft releases elastic potential energy to drive the lead screw to rotate. Through the design of the movable tightening gear shaft and the movable reversing gear shaft, the torque storage and torque release functions of the torque storage and release device are realized. In the torque storage, the first fixed gear shaft, the second fixed gear shaft, the movable tightening gear shaft and the coil spring gear shaft work together. When the push rod returns, the movable tightening gear shaft meshes with the corresponding gear to convert kinetic energy into potential energy, and this part of energy is effectively stored through the coil spring. In the torque release process, the first fixed gear shaft, the second fixed gear shaft, the movable reversing gear shaft and the coil spring gear shaft work together. When the electric cylinder needs to be started, the stored energy is released. The starting performance of the electric cylinder is effectively improved by combining the torque storage and release device with the power provided by the motor.

[0014] Further, the transmission gear set includes a first-stage spur gear arranged on the first fixed gear shaft, a second-stage large spur gear and a second-stage small spur gear arranged on the second fixed gear shaft, and a large-diameter thin spur gear and a small-diameter thick spur gear arranged on the coil spring gear shaft, a tightening gear is provided on the movable tightening gear shaft, and a first reversing gear and a second reversing gear are provided on the movable reversing gear shaft, the first-stage spur gear is meshed with the second-stage large spur gear, the tightening gear can enter or disengage from the meshing between the second-stage large spur gear and the small-diameter thick spur gear, the first reversing gear can enter or disengage from the meshing with the large-diameter thin spur gear, and the second reversing gear can enter or disengage from the meshing with the second-stage small spur gear.

[0015] A further beneficial effect of the above is that when the tightening gear of the movable tightening gear shaft is meshed with the second-stage large spur gear and the small-diameter thick spur gear, the kinetic energy from the push rod can be effectively converted into the elastic potential energy of the coil spring, thereby achieving efficient energy storage. When energy needs to be released, the meshing of the first reverse gear of the movable reverse gear shaft and the large-diameter thin spur gear and the meshing of the second reverse gear and the second-stage small spur gear can ensure that the energy is released quickly and smoothly. The gears on the movable tightening gear shaft and the movable reverse gear shaft can respectively enter or disengage from the meshing with the transmission gear set. This design not only improves the flexibility and controllability of the torque storage and release device, but also reduces energy loss and mechanical wear during torque storage and release, thereby extending the service life of the equipment.

[0016] Furthermore, the gear reducer also includes a reduction box, a second-stage gear shaft and a third-stage gear shaft. The first-stage gear shaft, the second-stage gear shaft, the third-stage gear shaft and the final-stage gear shaft are all installed in the reduction box in a manner that can rotate around an axis, and the first-stage gear shaft, the second-stage gear shaft, the third-stage gear shaft and the final-stage gear shaft are provided with a reduction gear set that meshes with each other.

[0017] The beneficial effect of adopting the above further scheme is that through the meshing of multi-stage gears, the gear reducer can more effectively transmit the power of the motor to the load connection unit. This multi-stage gear transmission design enables the gear reducer to generate a larger torque output, meeting the needs of the electric cylinder during high-torque lifting, and ensuring that the electric cylinder can still operate stably when under heavy load.

[0018] Furthermore, the energy recovery device also includes an overspeed clutch, and the end of the first-stage gear shaft away from the motor is connected to the overspeed clutch, and the overspeed clutch is used to generate a braking torque to control the speed of rotation of the screw.

[0019] The beneficial effect of adopting the above further scheme is that when an abnormality occurs in the motor or transmission system, causing the screw speed to be too high, the overspeed clutch can quickly generate braking torque to limit the screw speed and avoid the safety hazards caused by overspeeding, thereby protecting the system from damage; in addition, by controlling the rotation speed of the screw through the overspeed clutch, it can also ensure that the energy recovery process of the torque storage and release device is smoother and more efficient.

[0020] Furthermore, the transmission unit also includes a cylinder, a front bearing seat assembly, a rear bearing seat assembly and a load connection unit, the screw and the nut pair are both located in the cylinder, the front bearing seat assembly and the rear bearing seat assembly are respectively installed at both ends of the cylinder, the two ends of the screw are supported by the front bearing seat assembly and the rear bearing seat assembly, and the load connection unit is connected to the nut pair and can move with the nut pair.

[0021] The beneficial effects of adopting the above further scheme are: first, by installing the front bearing seat assembly and the rear bearing seat assembly at both ends of the cylinder, the two ends of the screw are effectively supported, which can ensure the stability of the screw during the transmission process and reduce the shaking caused by vibration or load changes, thereby enhancing the structural stability of the entire electric cylinder system. Secondly, the screw and the nut pair are both located in the cylinder. This closed structure helps to reduce the interference of the external environment on the transmission components, such as dust, moisture, etc. Finally, since the load connection unit can move with the nut pair, precise control and positioning of the load can be achieved.

[0022] Furthermore, the load connection unit includes a push rod and a rod head. The push rod is sleeved outside the lead screw, and one end of the push rod is connected to the nut pair, and the other end of the push rod is installed with the rod head.

[0023] Furthermore, the lead screw comprises a transmission threaded shaft section, a short cylindrical smooth shaft section and a connecting threaded shaft section in sequence from the front end to the rear end, the nut pair is installed on the transmission threaded shaft section, the short cylindrical smooth shaft section cooperates with the rear bearing seat assembly, the connecting threaded shaft section is used to install a locking nut, and the first external spline shaft is located at one end of the lead screw close to the connecting threaded shaft section.

[0024] The beneficial effect of adopting the above-mentioned further scheme is that the transmission threaded shaft section cooperates with the nut pair to be responsible for the main transmission function of the screw, and the short cylindrical optical shaft section cooperates with the rear bearing seat assembly to provide stable support for the screw. A locking nut is installed on the connecting threaded shaft section, and the locking nut cooperates with the connecting threaded shaft section to lock the screw and the rear bearing seat assembly, thereby locking the screw axially to ensure the stability and reliability of the entire system.

[0025] Furthermore, a wear-resistant wheel is provided at the front end of the transmission threaded shaft section, and the wear-resistant wheel is used as a wear-resistant front end support of the lead screw in the push rod hole of the push rod.

[0026] Furthermore, the nut pair includes a nut body, a connecting head and a sealing end cover, the connecting head and the sealing end cover are respectively embedded in the two ends of the nut body, the connecting head is a round sleeve with an internal thread, and the connecting head is used to connect with the push rod.

[0027] The beneficial effect of adopting the above further solution is that the connector is a round sleeve with internal threads, so that the push rod can be easily and quickly connected to the nut pair, thereby improving the assembly efficiency, and the sealing end cover can provide a sealing function for the nut pair to prevent foreign dust, moisture and other impurities from entering the nut pair and affecting the normal operation of the screw transmission system. At the same time, the sealing end cover can also effectively prevent the leakage of lubricating oil, maintain the lubrication state of the screw nut transmission unit, and extend the service life.

[0028] Furthermore, a proximity sensor is also included, and the proximity sensor is installed on the nut body.

[0029] The beneficial effect of adopting the above further solution is that it can cooperate with the position proximity sensor on the linear groove on the outer side of the cylinder barrel to detect the position and state of the nut pair in real time, thereby achieving precise control of the screw transmission process.

[0030] Furthermore, it also includes a lug plate, which includes an ear hole, and the lug plates are provided at both ends of the cylinder.

[0031] The beneficial effect of adopting the above further solution is that it is convenient to fix and move the lifting equipment.

[0032] Furthermore, the torque storage and release device includes a first coil spring and a second coil spring, and the first coil spring and the second coil spring are respectively arranged at two ends of the coil spring gear shaft.

[0033] The beneficial effect of adopting the above further solution is that the number of the torque storage and release devices is two, so as to increase the storage and release amount of torsional elastic potential energy.

[0034] Furthermore, the gear box has a three-layer structure, comprising a first layer box body, a second layer box body and a third layer box body stacked together in sequence, a coil spring mounting cavity 1 is provided on the inner wall of the first layer box body, a coil spring mounting cavity 2 is provided on the inner wall of the third layer box body, the first coil spring and the second coil spring are respectively arranged in the coil spring mounting cavity 1 and the coil spring mounting cavity 2; a plurality of grooves arranged in a circular array are provided on the inner circumferential side walls of the coil spring mounting cavity 1 and the coil spring mounting cavity 2, the inner end of the first coil spring is connected to one end of the coil spring gear shaft, the outer end of the first coil spring is arranged in the groove of the coil spring mounting cavity 1, the inner end of the second coil spring is connected to the other end of the coil spring gear shaft, and the outer end of the second coil spring is arranged in the groove of the coil spring mounting cavity 2.

[0035] The beneficial effect of adopting the above further solution is that the three-layer structure of the gearbox and its coil spring installation solution can significantly improve the performance, stability and service life of the gearbox, while also facilitating maintenance and replacement.

[0036] Furthermore, the two ends of the first fixed gear shaft are respectively mounted on the first layer of the box body and the second layer of the box body, the two ends of the second fixed gear shaft are respectively mounted on the first layer of the box body and the second layer of the box body, one end of the coil spring gear shaft is mounted in the first positioning mounting hole in the coil spring mounting cavity one, the other end of the coil spring gear shaft is mounted in the third positioning mounting hole in the coil spring mounting cavity two, and the middle of the coil spring gear shaft passes through the second positioning mounting hole located on the second layer of the box body.

[0037] The beneficial effect of adopting the above-mentioned further scheme is that by respectively installing the two ends of the first fixed gear shaft and the second fixed gear shaft on the first layer of the box body and the second layer of the box body, the gear shaft is ensured to be firmly installed, thereby enhancing the structural stability of the entire gear box, and can reduce the shaking and vibration of the gear shaft when rotating at high speed or bearing large torque, thereby improving the accuracy and reliability of the gear transmission; the two ends of the coil spring gear shaft are respectively installed in the positioning mounting holes in the coil spring mounting cavity one and the coil spring mounting cavity two, and supported by the second layer of the box body. This design enables the coil spring gear shaft to be better supported and balanced when rotating.

[0038] Furthermore, an intermediate support plate is provided in the gear box, the intermediate support plate is supported in the second layer box, and the third long arc track hole and the fourth long arc track hole are provided on the intermediate support plate.

[0039] The beneficial effect of adopting the above further solution is that the intermediate support plate can provide additional positioning and support for the components in the gear box. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0041] Figure 1 It is a structural schematic diagram of the electric lifting cylinder of the utility model;

[0042] Figure 2 It is a structural schematic diagram of the energy recovery device of the utility model;

[0043] Figure 3 It is a schematic diagram of the structure of the reduction box of the utility model;

[0044] Figure 4 It is a structural schematic diagram of the mutually meshing state of the transmission gear sets in the reduction box of the utility model;

[0045] Figure 5 It is a structural schematic diagram of the torque storage and release device of the utility model;

[0046] Figure 6 It is a schematic diagram of the structure inside the first layer box body and the second layer box body of the torque storage and release device of the utility model;

[0047] Figure 7 It is a schematic diagram of the structure inside the third layer box of the torque storage and release device of the utility model;

[0048] Figure 8 This is a schematic diagram of the structure of the first layer box of the utility model;

[0049] Fig. 9 It is a structural schematic diagram of the second layer box of the utility model;

[0050] Fig.10 This is a schematic diagram of the structure of the third layer box of the utility model;

[0051] Fig.11 It is a schematic diagram of the rotation of the gear shaft involved in the transmission during the torque storage of the utility model;

[0052] Fig.12 It is a schematic diagram of the rotation of the gear shaft involved in the transmission when releasing the torque of the utility model;

[0053] Fig.13 This is a schematic structural diagram of the intermediate support plate of the utility model;

[0054] Fig.14It is an orthographic projection diagram of the gear shaft of the torque storage and release device of the utility model installed on the intermediate support plate;

[0055] Fig.15 It is a structural schematic diagram of the cylinder barrel of the utility model;

[0056] Fig.16 It is a structural schematic diagram of the lead screw of the utility model;

[0057] Fig.17 It is a structural schematic diagram of the nut body of the utility model;

[0058] Fig.18 This is a schematic diagram of the structure of the connector of the utility model;

[0059] Fig.19 It is a structural schematic diagram of the sealing end cover of the utility model;

[0060] Fig. 20 It is a structural schematic diagram of a load connection unit of the utility model;

[0061] Fig.21 It is a structural schematic diagram of the club head of the utility model;

[0062] Fig. 22 It is a schematic diagram of the structure after the special-shaped connecting nut and the fastening nut are installed on the rod head of the utility model;

[0063] Among them, in the figure:

[0064] 100. Motor;

[0065] 200, gear reducer;

[0066] 210, reduction box;

[0067] 220, first stage gear shaft; 221, first stage helical gear;

[0068] 230, second stage gear shaft; 231, second stage helical gear; 232, second stage spur gear;

[0069] 240, third-stage gear shaft; 241, third-stage large spur gear; 242, third-stage small spur gear;

[0070] 250, final gear shaft; 251, internal spline through hole;

[0071] 300, torque storage and release device;

[0072] 310, gear box; 311, first layer box body; 3111, second long arc track hole; 3112, coil spring installation cavity 1; 31121, groove; 3113, first supporting cylinder; 3114, second supporting cylinder; 3115, first through hole; 3116, first positioning installation hole; 312, second layer box body; 3121, first long arc track hole; 3122, second positioning installation hole; 313, third layer box body; 3131, coil spring installation cavity 2; 3132, third supporting cylinder; 3133, third positioning installation hole;

[0073] 320, middle support plate; 321, third long arc track hole; 322, fourth long arc track hole; 323, notch; 324, second through hole;

[0074] 330, first fixed gear shaft; 331, first stage spur gear; 332, second external spline shaft;

[0075] 340, second fixed gear shaft; 341, second stage large spur gear; 342, second stage small spur gear;

[0076] 350, coil spring gear shaft; 351, large diameter thin spur gear; 352, small diameter thick spur gear; 353, first coil spring; 3531, inner end; 3532, outer end; 354, second coil spring;

[0077] 360, movable tightening gear shaft; 361, tightening gear;

[0078] 370, movable reverse gear shaft; 371, first reverse gear; 372, second reverse gear;

[0079] 400, overdrive clutch;

[0080] 500, transmission unit;

[0081] 510, cylinder;

[0082] 520, front bearing seat assembly;

[0083] 530, rear bearing seat assembly;

[0084] 540, lead screw; 541, transmission threaded shaft section; 542, short cylindrical optical shaft section; 543, connecting threaded shaft section;

[0085] 550, nut pair; 551, nut body; 552, connector; 553, sealing end cover;

[0086] 560, first external spline shaft;

[0087] 600, load connection unit;

[0088] 610, Putting;

[0089] 620, rod head; 621, load connection part; 622, first connection cylinder; 623, second connection cylinder; 6231, annular groove; 624, third connection cylinder; 625, special-shaped connection nut; 6251, hexagonal nut; 6252, positioning sleeve; 6253, external thread connection cylinder; 626, fastening nut;

[0090] 700. Lug plate. DETAILED DESCRIPTION

[0091] The principles and features of the present invention are described below in conjunction with examples. The examples are only used to explain the present invention and are not used to limit the scope of the present invention.

[0092] Aiming at the problem that the existing lifting electric cylinder cannot recover energy during the return process, resulting in energy waste and additional loss of the motor 100 during the return process, the utility model designs a lifting electric cylinder that can store and release return energy.

[0093] like Figure 1 - Fig. 22 As shown, a lifting electric cylinder with return energy storage and release includes a motor 100 capable of forward and reverse rotation, an energy recovery device, a transmission unit 500 and a load connection unit 600, wherein the energy recovery device includes a gear reducer 200 and a torque storage and release device 300, the transmission unit 500 includes a lead screw 540, a nut pair 550 matched with the lead screw 540 and the first external spline shaft 560, and the load connection unit 600 is connected to the nut pair 550 and can reciprocate with the nut pair 550. , the first external spline shaft 560 is located at the end of the screw 540, the torque storage and release device 300 includes a second external spline shaft 332, the gear reducer 200 includes at least a first-stage gear shaft 220 and a final-stage gear shaft 250, the first-stage gear shaft 220 is drivingly connected to the motor shaft of the motor 100, the final-stage gear shaft 250 is a hollow internal spline shaft, one side of the internal spline shaft is meshed with the first external spline shaft 560, and the other side of the internal spline shaft is meshed with the second external spline shaft 332.

[0094] The final gear shaft 250 is a hollow internal spline shaft having an internal spline through hole 251. One end of the final gear shaft 250 is connected to the first external spline shaft 560 at the end of the lead screw 540 through the internal spline through hole 251 thereon. The length of the first external spline shaft 560 is less than half the length of the internal spline through hole 251. The other end of the final gear shaft 250 is connected to the second external spline shaft 332 of the torque storage device 300 through the remaining part of the internal spline through hole 251. The final gear shaft 250 of the gear reducer 200 serves as an intermediate power transmission link between the lead screw 540 and the torque storage / release device 300, and can realize multiple functions: first, it can transmit the torque of the motor 100 to the lead screw 540, drive the lead screw 540 to rotate, and realize the lifting action of the electric cylinder; second, when the lead screw 540 is subjected to the reverse torque generated by the load gravity, the gear shaft can transmit this torque to the reducer and the torque storage / release device 300 to recover and store energy; finally, when the electric cylinder needs to return or lift again, the gear shaft can also reversely transfer the elastic potential energy stored in the torque storage / release device 300 to the lead screw 540, realize the instantaneous release of energy, and thus improve the efficiency and performance of the entire system.

[0095] In addition, in a specific embodiment,

[0096] The motor 100 is a forward and reverse AC induction motor 100, which is connected to the gear reducer 200 through a coupling. The two ends of the coupling are respectively fixed on the motor shaft of the motor 100 and the first-stage gear shaft 220 of the gear reducer 200. The motor shaft and the first-stage gear shaft 220 are provided with keyways, and the torque is transmitted by a flat key. The forward and reverse functions of the motor 100 provide the original power for the lifting and return of the electric cylinder.

[0097] like Figure 2 As shown, the energy recovery device includes a gear reducer 200, an overdrive clutch 400 and a torque storage releaser 300. The gear reducer 200 has the functions of transmitting torque, decelerating in the forward direction and accelerating in the reverse direction. The overdrive clutch 400 can limit the maximum rotation speed of the lead screw 540 when the electric cylinder does not fall back normally due to power failure, thereby playing a safety protection role. The torque storage releaser 300 can store the initial torsional kinetic energy of the lead screw 540 in the form of torsional elastic potential energy when the electric cylinder returns in the coil spring, and release the torsional elastic potential energy back to the lead screw 540 in the reverse direction and instantly when lifting, so as to increase the starting speed and acceleration of the electric cylinder. The lower end of the gear reducer 200 is connected to the adapting threaded hole of the motor 100 through a long screw, and the upper end thereof is connected to the adapting threaded hole of the rear bearing seat through a composite long screw with an internal threaded hole; the overrunning clutch 400 is connected to the adapting threaded hole at the lower end of the gear reducer 200 through a long screw; the torque storage and release device 300 is connected to the internal threaded hole of the composite long screw with an internal threaded hole at the upper end of the gear reducer 200 through a long screw.

[0098] The electromagnetic brake: The motor 100 is provided with an electromagnetic brake (not shown in the figure) that can be manually released. When the motor shaft is locked due to abnormal power failure, the electromagnetic brake can be released manually to unlock the motor shaft. Once unlocked, the gravity of the lifting platform and its load will drive the lead screw 540 to drive the multi-stage gears of the reducer to reverse, thereby causing the lifting platform and the load to descend. In this process, the overspeed clutch 400 will play a role. It can limit the maximum rotation speed of the lead screw 540 when the electric cylinder falls abnormally due to power failure, thereby playing a role in safety protection. Therefore, the design of the overspeed clutch 400 ensures the safety and stability of the entire descent process. The overspeed clutch 400 is connected to the non-motor 100 side of the first-stage gear shaft 220 of the gear reducer 200 to generate a braking torque to control the rotation speed of the lead screw 540. Its working principle is as follows: after the electromagnetic brake is manually released, the lead screw 540 reverses under the action of gravity, driving the load to descend. In the initial stage of descent, the initial speed of the lead screw 540 is transmitted to the overdrive clutch 400 after the reverse speed-increasing action of the gear reducer 200. At this time, under the action of centrifugal force, the friction plate in the overdrive clutch 400 and the housing produce friction, thereby generating a braking torque. As the return speed increases, the braking torque will also increase accordingly until it is equal to the reverse torque generated by the lead screw 540 due to the lifting platform and the load gravity. At this time, the speed of the first-stage gear shaft 220 and the motor shaft of the gear reducer 200 will be reduced to a certain stable value, and the lead screw 540 will be reduced to a safe low-speed uniform rotation under the deceleration effect of the reducer. This design ensures that the load supported by the electric cylinder and the operator can descend safely and smoothly, effectively avoiding the risk of overspeed descent of the load.

[0099] like Figure 3 and Figure 4As shown, the gear reducer 200 includes a reduction box 210, a first-stage gear shaft 220, a second-stage gear shaft 230, a third-stage gear shaft 240 and a final-stage gear shaft 250. The first-stage gear shaft 220, the second-stage gear shaft 230, the third-stage gear shaft 240 and the final-stage gear shaft 250 are all installed in the reduction box 210 in a manner that they can rotate around an axis. Each gear shaft has supporting journals at both ends, and bearings are installed on the journals. The bearings of each stage of the gear shaft are supported by the bearing seat holes of the reduction box 210. The axes of the first-stage gear shaft 220, the second-stage gear shaft 230, the third-stage gear shaft 240 and the final-stage gear shaft 250 are parallel to each other, and the first-stage gear shaft 220, the second-stage gear shaft 230, the third-stage gear shaft 240 and the final-stage gear shaft 250 are provided with a reduction gear set that meshes with each other. In this embodiment, the reduction gear set includes a first-stage bevel gear 221 arranged on the first-stage gear shaft 220, a second-stage bevel gear 231 and a second-stage spur gear 232 arranged on the second gear shaft, a third-stage large spur gear 241 and a third-stage small spur gear 242 arranged on the third-stage gear shaft 240, and a fourth-stage spur gear arranged on the final-stage gear shaft 250, the first-stage bevel gear 221 is meshed with the second-stage bevel gear 231, the second-stage spur gear 232 is meshed with the third-stage large spur gear 241, and the third-stage small spur gear 242 is meshed with the fourth-stage spur gear. In the embodiment of the utility model, the gear reducer adopts a three-stage reduction structure, and after three reductions, the reduction ratio reaches about 10. Of course, the gear reducer can also adopt more or less stages, as long as the reduction ratio requirements are met, it should be within the protection scope of the utility model.

[0100] like Figure 5 - Fig.14As shown, the torque storage and release device 300 includes a gear box 310, a first fixed gear shaft 330, a second fixed gear shaft 340, a coil spring gear shaft 350, a movable tightening gear shaft 360 and a movable reverse gear shaft 370, wherein the first fixed gear shaft 330, the second fixed gear shaft 340, the coil spring gear shaft 350, the movable tightening gear shaft 360 and the movable reverse gear shaft 370 are parallel to each other, and the first fixed gear shaft 330, the second fixed gear shaft 340 and the coil spring gear shaft 350 are all installed in the gear box 310 in a manner that they can rotate around an axis, and the gear box 310 is also provided with a first long arc track hole 3121, a second long arc track hole 3122 and a second long arc track hole 3123. The second long arc track hole 3111, the third long arc track hole 321 and the fourth long arc track hole 322, the third long arc track hole 321 is arranged opposite to the first long arc track hole 3121, the fourth long arc track hole 322 is arranged opposite to the second long arc track hole 3111, the two ends of the movable tightening gear shaft 360 are respectively installed in the first long arc track hole 3121 and the third long arc track hole 321, the two ends of the movable reversing gear shaft 370 are respectively installed in the second long arc track hole 3111 and the fourth long arc track hole 322, the second external spline shaft 332 is arranged on the first fixed gear shaft 330 The first fixed gear shaft 330 is also provided with a first-stage spur gear 331, the second fixed gear shaft 340 is provided with a second-stage large spur gear 341 and a second-stage small spur gear 342, the movable tightening gear shaft 360 is provided with a tightening gear 361, the movable reverse gear shaft 370 is provided with a first reverse gear 371 and a second reverse gear 372, the coil spring gear shaft 350 is provided with a large-diameter thin spur gear 351, a small-diameter thick spur gear 352, a first coil spring 353 and a second coil spring 354, the first coil spring 353 and the second coil spring 354 are provided, and the first coil spring 353 and the second coil spring 354 are provided. 4 are all plane spiral springs; the first-stage spur gear 331 is meshed with the second-stage large spur gear 341, the tightening gear 361 is arranged between the second-stage large spur gear 341 and the small-diameter thick spur gear 352, the tightening gear 361 can enter or disengage from the meshing between the second-stage large spur gear 341 and the small-diameter thick spur gear 352, the first reversing gear 371 can enter or disengage from the meshing with the large-diameter thin spur gear 351, and the second reversing gear 372 can enter or disengage from the meshing with the second-stage small spur gear 342.

[0101] In this embodiment, the coil spring is a torsional elastic potential energy storage component of the torque storage and release device 300. In this embodiment, the torque storage and release device 300 has two coil springs, namely, a first coil spring 353 and a second coil spring 354, to increase the storage and release amount of torsional elastic potential energy. Of course, the number of coil springs can also be more or less, as long as the energy storage or release requirements can be met, they should be within the protection scope of the utility model. The gear box 310 is provided with the coil spring installation cavity 1 3112 and the coil spring installation cavity 2 3131. The inner peripheral side walls of the coil spring installation cavity 1 3112 and the coil spring installation cavity 2 3131 are provided with a plurality of grooves 31121 arranged in a circular array. The first coil spring 353 and the second coil spring 354 are respectively arranged at the two ends of the coil spring gear shaft 350, and are respectively located in the coil spring installation cavity 1 3112 and the coil spring installation cavity 2 3131. The inner end 3531 of the first coil spring 353 is connected to one end of the coil spring gear shaft 350, and the outer end 3532 of the first coil spring 353 is arranged in any one groove 31121 in the coil spring installation cavity 1 3112, and the inner end 3531 of the second coil spring 354 is connected to the other end of the coil spring gear shaft 350, and the outer end 3532 of the second coil spring 354 is arranged in any one groove 31121 in the coil spring installation cavity 2 3131. More specifically, the inner ends 3531 of the first coil spring 353 and the second coil spring 354 both have an S-shaped curling structure, and the two ends of the coil spring gear shaft 350 are respectively a short cylindrical support shaft and a long cylindrical support shaft containing a rectangular groove. The inner ends 3531 of the first coil spring 353 and the second coil spring 354 are respectively inserted into the rectangular grooves of the short cylindrical support shaft and the long cylindrical support shaft. When the coil spring gear shaft 350 rotates, the first coil spring 353 and the second coil spring 354 rotate together to store torsional elastic potential energy. At the same time, they can also be driven in the reverse direction by the coil spring gear shaft 350, thereby releasing the torsional elastic potential energy previously stored. The outer ends 3532 of the first coil spring 353 and the second coil spring 354 are outer flanged and adhered structures, and the outer ends 3532 of the first coil spring 353 and the second coil spring 354 are respectively located in any one of the grooves 31121 in the coil spring mounting cavity 1 3112 and the coil spring mounting cavity 2 3131. When the coil spring gear shaft 350 rotates a certain number of times to tighten the first coil spring 353 and the second coil spring 354, if the movable tightening gear shaft 360 continues to rotate, the outer flanged and adhered structures of the first coil spring 353 and the second coil spring 354 slide unidirectionally in the coil spring mounting cavity 1 3112 and the coil spring mounting cavity 2 3131 in turn along the tightening direction to the next adjacent groove 31121. Therefore, when the coil spring is tightened, it will not be affected by the excessive number of rotations of the movable tightening gear shaft 360, that is, it will not be affected by the return length of the electric cylinder, thereby avoiding overload damage to the first coil spring 353 and the second coil spring 354.When the first coil spring 353 and the second coil spring 354 release the torsional elastic potential energy in the opposite direction, the outer flanged abutting structures of the outer ends 3532 of the first coil spring 353 and the second coil spring 354 respectively stably abut the inner wall of the groove 31121 in the corresponding coil spring installation cavity, that is, the outer flanged edge of the first coil spring 353 abuts the inner wall of the groove 31121 in the coil spring installation cavity 1 3112, and the outer flanged edge of the second coil spring 354 abuts the inner wall of the groove 31121 in the coil spring installation cavity 2 3131. The abutting point of the coil spring is used as the force point to ensure that in the process of releasing energy, the S-shaped curling structure of the inner ends 3531 of the first coil spring 353 and the second coil spring 354 can effectively drive the coil spring gear shaft 350 to rotate. The embodiment of the utility model does not limit the number of turns and thickness of the first coil spring 353 and the second coil spring 354, which can be flexibly determined according to the need to store and release torsional elastic potential energy.

[0102] like Figure 5 - Fig.10As shown, the gearbox 310: The gearbox 310 is a three-layer structure, and the gearbox 310 includes a first-layer box body 311, a second-layer box body 312, and a third-layer box body 313 stacked together in sequence. The gearbox 310 is also provided with an intermediate support plate 320, and the intermediate support plate 320 is supported in the second-layer box body 312. The intermediate support plate 320 can provide additional positioning and support for the components in the gearbox 310. The first-layer box body 311 is provided with the second long arc track hole 3111, the second-layer box body 312 is provided with the first long arc track hole 3121, and the third long arc track hole 321 and the fourth long arc track hole 322 are provided on the intermediate support plate 320. More specifically, the first layer box body 311 is a rectangular box body with an opening on the right side, and the middle of the lower part thereof is a coil spring installation cavity 3112. The coil spring installation cavity 3112 has a plurality of grooves 31121 arranged in a circular array inside, and any one of the grooves 31121 can be selected as the installation position of the outer flange tight structure of the outer end 3532 of the first coil spring 353; when the first coil spring 353 is tightened, the outer flange tight structure of the outer end 3532 of the first coil spring 353 can make the first coil spring 353 slide unidirectionally from the groove 31121 to the next adjacent groove 31121 in the installation cavity along the tightening direction; when the first coil spring 353 is released in the reverse direction, the outer flange tight structure of the outer end 3532 of the first coil spring 353 can stably abut against the side wall of the groove 31121, so that the first coil spring 353 can effectively drive the coil spring gear shaft 350 to rotate. The center of the installation cavity of the first coil spring 353 is the first positioning installation hole 3116. The middle of the upper part of the first layer box body 311 is a first through hole 3115 with a larger diameter, which can allow the second external spline shaft 332 on the first fixed gear shaft 330 to pass through, so that the second external spline shaft 332 can extend outward and mesh with the internal spline shaft of the gear reducer 200. A small-diameter long arm hole is provided in the middle part of the first layer box body 311, which is a hole for radial positioning and support of the long cylindrical optical axis section of the second fixed gear shaft 340. The first layer box body 311 is also provided with a second long arc track hole 3111, which is a hole for mounting and radial position constraint of the movable reverse gear shaft 370; the movable reverse gear shaft 370 disengages from or enters into meshing with the large-diameter thin spur gear 351 on the coil spring gear shaft 350 according to the force conditions. The first layer box 311, the second layer box 312 and the third layer box 313 are provided with four light holes in the middle and upper edges. The three layers of the gear box 310 are fastened to the composite long screws with internal thread holes on the gear reducer 200 box by four long connecting screws. Figure 8As shown, two first support cylinders 3113 with three-step structures are respectively provided at the lower right corner and the left side of the upper middle portion of the first layer box 311. The first support cylinders 3113 are used as positioning support elements for the middle support plate 320 and the second layer box 312. A second support cylinder 3114 is also provided at the right side of the middle portion of the first layer box 311. The second support cylinder 3114 is used as an auxiliary support element for the middle support plate 320. Fig. 9 As shown, the second layer box 312 is a rectangular box with an opening on the left side. Fig.10 As shown, the third-layer box 313 is a rectangular box with an opening on the left side, and a coil spring installation cavity 2 3131 is provided in the third-layer box 313, and its structure and coil spring installation method are the same as those of the first-layer box 311; the third-layer box 313 is provided with four smooth third support cylinders 3132, and the positions of the four third support cylinders 3132 correspond to the positions of the four first support cylinders 3113, and the end faces of the four third support cylinders 3132 are in contact with the end faces of the four first support cylinders 3113 in the first-layer box 311, respectively, to enhance the support strength of the third-layer box 313. Therefore, the first support cylinder 3113, as a positioning support element, can not only stably support the second-layer box 312, but also the three-step structure thereon can ensure that the middle support plate 320 can be accurately placed, so that the box can maintain a stable structure during stacking and assembly, avoiding possible misalignment. Meanwhile, during the assembly process of the first layer box 311 and the third layer box 313, the first supporting cylinder 3113 corresponds to and contacts the third supporting cylinder 3132, thereby enhancing the supporting strength of the third layer box 313 and making the entire structure more stable and reliable.

[0103] like Fig.13As shown, the middle support plate 320 is provided with a third long arc track hole 321 and a fourth long arc track hole 322. The third long arc track hole 321 is composed of two long concentric arcs and two short arcs. The third long arc track hole 321 is vertically inclined, which can ensure that when the torque is stored, the movable tightening gear shaft 360 contacts the second-stage large spur gear 341 on the second fixed gear shaft 340 under the action of its own weight. The fourth long arc track hole 322 is the mounting hole of the movable reverse gear shaft 370. The fourth long arc track hole 322 is also composed of two long concentric arcs and two short arcs. The fourth long arc track hole 322 is horizontally inclined upward. Four mounting holes are also provided on the middle support plate 320. The middle support plate 320 matches the four first support cylinders 3113 on the first layer box 311 through the four mounting holes thereon, so as to be accurately positioned and mounted on the first layer box 311. The upper right corner of the intermediate support plate 320 is also provided with a notch 323 consisting of a short arc, a long arc and a long straight line. The short arc part contacts the second support cylinder 3114 on the first layer box body 311, playing an auxiliary supporting role. The second stage small spur gear 342 on the second fixed gear shaft 340 is installed in the first layer box body 311 through the notch 323. At the same time, the right side of the intermediate support plate 320 is the axial positioning surface of the second stage large spur gear 341 of the second fixed gear shaft 340, so that the axial position of the second stage fixed gear shaft is determined. The middle and lower part of the intermediate support plate 320 is provided with a second through hole 324, and the small diameter thick spur gear 352 on the coil spring gear shaft 350 passes through the second through hole 324 and enters the second layer box body 312.

[0104] The first fixed gear shaft 330 includes a second spline shaft, a long cylindrical shaft at one end, a spur gear and a short cylindrical shaft connected in sequence. The two ends of the first fixed gear shaft 330 are respectively mounted on the first layer box body 311 and the second layer box body 312, and the first fixed gear shaft 330 can rotate around the axis. The second spline shaft is meshed with the internal spline of the final gear shaft 250 of the gear reducer 200. Its long cylindrical shaft is the connecting part of the second spline shaft and the spur gear, and its short cylindrical shaft is inserted into the matching support hole on the second layer box body 312 as the support part on this side.

[0105] The second fixed gear shaft 340 includes a short cylindrical optical axis, a second-stage large spur gear 341, a second-stage small spur gear 342 and a long cylindrical optical axis connected in sequence. The two ends of the second fixed gear shaft 340 are respectively mounted on the first-layer box body 311 and the second-layer box body 312, and the second fixed gear shaft 340 is mounted on the gear box 310 in a manner that it can rotate around the axis. A short cylindrical optical axis on the second fixed gear shaft 340 is inserted into a matching support hole on the second-layer box body 312 as the supporting part on this side, and a long cylindrical optical axis on the second fixed gear shaft 340 is inserted into a matching support hole on the first-layer box body 311 as the supporting part on this side.

[0106] The movable tightening gear shaft 360 includes a tightening gear 361, and the two ends of the movable tightening gear shaft 360 are respectively inserted into the third long arc track hole 321 on the middle support plate 320 and the first long arc track hole 3121 on the second layer box 312 as support. The specific position of the movable tightening gear shaft 360 will adaptively move along the first long arc track hole 3121 and the third long arc track hole 321 under the combined action of gravity and the meshing force of the adjacent gears. When the torque is stored, the tightening gear 361 can smoothly enter the meshing state; when the torque is released, the tightening gear 361 can automatically disengage the meshing state.

[0107] The coil spring gear shaft 350 includes a short cylindrical support shaft with a rectangular groove, a large diameter thin spur cylindrical gear 351, a small diameter thick spur cylindrical gear 352 and a long cylindrical support shaft with a rectangular groove. The short cylindrical support shaft end of the coil spring gear shaft 350 is installed in the first positioning mounting hole 3116 in the coil spring mounting cavity 1 3112, and the long cylindrical support shaft end of the coil spring gear shaft 350 is installed in the third positioning mounting hole 3133 in the coil spring mounting cavity 2 3131. The middle of the coil spring gear shaft 350 passes through the second positioning mounting hole 3122 located on the second layer box body 312, and the coil spring gear shaft 350 can rotate around the axis.

[0108] The torque storage and release device 300 is a torque return mechanism, which is connected to the lead screw 540 through the final gear shaft 250 of the gear reducer 200. When the electric cylinder returns, the torque of the lead screw 540 reversed in the early stage can be stored in the coil spring in the form of elastic potential energy, and the torsional elastic potential energy is reversed and instantaneously released back to the lead screw 540 during lifting, so as to increase the starting speed and acceleration of the electric cylinder. The torque storage and release device 300 includes torque storage and torque release functions, the active tightening gear shaft 360 participates in the torque storage process, and the active reverse gear shaft 370 participates in the torque release process. The specific positions of the active tightening gear shaft 360 and the active reverse gear shaft 370, as well as their engagement and disengagement with the adjacent gears are jointly affected by gravity and the force of the adjacent gears, and adapt to the specific working positions in their respective long arc track holes.

[0109] During the torque storage process, the components involved in the transmission include the first fixed gear shaft 330, the second fixed gear shaft 340, the movable tightening gear shaft 360 and the coil spring gear shaft 350; during the torque release process, the components involved in the transmission include the first fixed gear shaft 330, the second fixed gear shaft 340, the movable reverse gear shaft 370 and the coil spring gear shaft 350. The working principle of torque storage and release is as follows:

[0110] (1) Regarding the torque storage process: Fig.11 As shown, when the electric cylinder is returning, that is, when the lifting platform and the load are lowered, the push rod 610 is observed in the outward extension direction (refer to Fig.11 The screw 540 and the first fixed gear shaft 330 rotate clockwise, driving the second fixed gear shaft 340 to rotate counterclockwise; under the action of gravity, the tightening gear 361 of the movable tightening gear shaft 360 contacts the second-stage large spur gear 341 of the second fixed gear shaft 340. When the second fixed gear shaft 340 rotates counterclockwise, the second-stage large spur gear 341 applies an oblique downward force to the tightening gear 361, causing it to rotate clockwise and mesh with the small-diameter thick spur gear 352 on the coil spring gear shaft 350, causing the coil spring gear shaft 350 to rotate counterclockwise to tighten the coil springs at both ends, thereby storing torsional elastic potential energy. At this time, although the large diameter thin spur gear 351 on the coil spring gear shaft 350 is in contact with the first reverse gear 371 on the movable reverse gear shaft 370, the counterclockwise rotation of the coil spring gear shaft 350 applies an upward force to the movable reverse gear shaft 370, causing it to move upward along the first long arc track hole 3121 and the third long arc track hole 321 and leave the second fixed gear shaft 340. Therefore, during the torque storage process, the first reverse gear 371 and the second reverse gear 372 on the movable reverse gear shaft 370 do not participate in the meshing transmission.

[0111] (2) Regarding the torque release process: Fig.12As shown, when the electric cylinder is lifted, the torsional elastic potential energy stored in the coil spring will be released outwards, thereby pushing the coil spring gear shaft 350 to rotate clockwise, and the large diameter thin spur gear 351 of the coil spring gear shaft 350 contacts the first reverse gear 371 on the movable reverse gear shaft 370 and exerts a downward force thereon, so that the movable reverse gear shaft 370 moves downward along the second long arc track hole 3111 and the fourth long arc track hole 322 and rotates counterclockwise, so that the large diameter thin spur gear 351 on ... The toothed cylindrical gear 351 meshes with the first-stage small spur gear of the second fixed gear shaft 340 and drives the second fixed gear shaft 340 to rotate clockwise, the second reverse gear 372 on the movable reverse gear shaft 370 meshes with the second-stage small spur gear 342 on the second fixed gear shaft 340, and the second-stage large spur gear 341 on the second fixed gear shaft 340 drives the first fixed gear shaft 330 and the lead screw 540 to rotate counterclockwise to achieve the lifting of the electric cylinder push rod 610. At the same time, the clockwise rotation of the second fixed gear shaft 340 applies an upward force to the tightening gear 361, causing the tightening gear 361 to disengage, so that during the torque release process, the tightening gear 361 on the movable tightening gear shaft 360 does not participate in the meshing transmission.

[0112] like Fig.15 - Fig.19 As shown, the transmission unit 500 includes a cylinder 510, a lead screw 540, a nut pair 550 connected to the lead screw 540, a front bearing seat assembly 520, a rear bearing seat assembly 530 and a load connection unit 600. The cylinder 510 is a rectangular straight-cylindrical aluminum alloy profile with openings at both ends, a special-shaped cavity designed inside, and a straight through groove outside. The lead screw 540 and the nut pair 550 are both located in the cylinder 510, the front bearing seat assembly 520 and the rear bearing seat assembly 530 are respectively installed at the front and rear ends of the cylinder 510, the two ends of the lead screw 540 are supported by the front bearing seat assembly 520 and the rear bearing seat assembly 530, and the load connection unit 600 is connected to the nut pair 550 and can move with the nut pair 550.

[0113] The nut pair 550 includes a nut body 551, a connecting head 552 and a sealing end cover 553. The connecting head 552 and the sealing end cover 553 are respectively embedded at both ends of the nut body 551. The connecting head 552 is a round sleeve with an internal thread, and the connecting head 552 is used to connect with the push rod 610.

[0114] The lead screw 540 includes a transmission threaded shaft section 541, a short cylindrical smooth shaft section 542, a connecting threaded shaft section 543 and the first external spline shaft 560 from the front end to the rear end. The nut pair 550 is installed on the transmission threaded shaft section 541. The short cylindrical smooth shaft section 542 cooperates with the rear bearing seat assembly 530. The connecting threaded shaft section 543 is the axial locking part of the lead screw 540. A locking nut is installed on the connecting threaded shaft section to lock the rear bearing seat assembly 530 of the lead screw 540 to ensure the stability and reliability of the entire system. The first external spline shaft 560 is connected to the rear end of the connecting threaded shaft section 543. The first external spline shaft 560 can be integrally processed at the rear end of the lead screw 540, or can be separately processed and installed at the rear end of the lead screw 540. A wear-resistant wheel is provided at the front end of the transmission threaded shaft section 541, and the wear-resistant wheel serves as a wear-resistant front end support of the lead screw 540 in the hole of the push rod 610.

[0115] like Fig. 20 - Fig. 22 As shown, the load connection unit 600 includes a push rod 610 and a rod head 620. The push rod 610 is sleeved outside the lead screw 540, and one end of the push rod 610 is connected to the nut pair 550, and the other end of the push rod 610 is installed with the rod head 620. Fig. 20 As shown, the load connection unit 600 is in a T-shaped structure as a whole, and the rod head 620 includes a load connection portion 621 and a transition portion. The load connection portion 621 of the rod head 620 is a round tube structure with an embedded wear-resistant hard tube to reduce the rotational friction and wear between the load platform pin (not shown in the figure). Fig.21 As shown, the transition portion of the rod head 620 is three coaxial cylinders, including a first connecting cylinder 622 with a larger diameter, a second connecting cylinder 623 with a smaller diameter and an annular groove 6231, and a third connecting cylinder 624 with a smallest diameter and a connecting thread. The first connecting cylinder 622 is welded to the load connecting part 621, and the special-shaped connecting nut 625 is installed on the second connecting cylinder 623, and its cylindrical surface is the radial positioning surface of the special-shaped connecting nut 625. The shoulder surface between the first connecting cylinder 622 and the second connecting cylinder 623 is the axial positioning surface and thrust transmission surface of the special-shaped connecting nut 625. A sealing ring is installed in the annular groove 6231 to prevent the lubricating grease in the transition part from overflowing; the third connecting cylinder 624 is installed with a fastening nut 626, and the shoulder surface between the second connecting cylinder 623 and the third connecting cylinder 624 is the axial positioning surface of the fastening nut 626. The fastening nut 626 restricts the special-shaped connecting nut 625 on the second connecting cylinder 623 with a smaller diameter and annular groove 6231, and there is a small gap with the special-shaped connecting nut 625, so as to ensure the reliable connection and flexible rotation of the rod head 620 and the special-shaped connecting nut 625. Fig. 22As shown, the special-shaped connection nut 625 is a three-section structure with a central through hole, and is composed of a hexagonal nut 6251, a positioning sleeve 6252, and an externally threaded connection cylinder 6253. Among them, the external thread portion of the externally threaded connection cylinder 6253 is fastened and connected with the internal thread of the left end of the push rod 610 to form a whole; the positioning sleeve 6252 is the positioning portion of the special-shaped connection nut 625, the inner hole surface of the positioning sleeve 6252 cooperates with the outer cylindrical surface of the push rod 610 to limit its radial position, and the inner end 3531 surface of the positioning sleeve 6252 cooperates with the left end surface of the push rod 610 to limit its axial position and transmit the thrust of the push rod 610; the hexagonal nut 6251 is the disassembly force application part of the special-shaped connection nut 625, and the special-shaped connection nut 625 and the internal thread of the push rod 610 are disassembled and assembled through the hexagonal nut 6251. The push rod 610 is a hollow circular tube with strong load-bearing capacity, and its outer cylindrical surface and inner hole surface are smooth to reduce friction and wear between the front bearing seat assembly 520 and the wear-resistant polyurethane wheel at the head of the screw 540; the front end of the push rod 610 is provided with an internal thread, which is tightly connected to the external thread of the special-shaped connecting nut 625; the rear end of the push rod 610 is provided with an external thread, which is tightly connected to the internal thread of the connecting head 552 on the nut pair 550; the rear end of the push rod 610 is also provided with a top screw hole near the external thread, and a pin can be passed through to load and unload the push rod 610 on the nut pair 550.

[0116] The return energy storable lifting electric cylinder further includes a proximity sensor, which is mounted on the nut pair 550 .

[0117] The lifting electric cylinder capable of storing and releasing return energy further includes a lifting lug plate 700 , wherein the lifting lug plate 700 includes an ear hole, and the lifting lug plates 700 are disposed at both ends of the cylinder barrel 510 .

[0118] The utility model is a lifting electric cylinder with return energy storage and release, which can recover energy when the push rod 610 returns, and use this recovered energy to assist the starting process of the electric cylinder, which not only improves the starting performance and overall performance of the electric cylinder, but also significantly reduces the discharge of the battery, thereby increasing the use time of the battery after a single charge and reducing the loss of the battery. In addition, it can ensure that the electric cylinder is safer and more stable during operation, and reduce the operating cost.

[0119] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A lifting electric cylinder capable of storing and releasing return energy, characterized in that: The invention comprises a motor (100) capable of forward and reverse rotation, an energy recovery device, a transmission unit (500) and a load connection unit (600), wherein the energy recovery device comprises a gear reducer (200) and a torque storage and release device (300), the transmission unit (500) comprises a lead screw (540), a nut pair (550) matched and connected to the lead screw (540), and a first external spline shaft (560), the load connection unit (600) is connected to the nut pair (550) and can reciprocate with the nut pair (550), and the first external spline shaft (560) is connected to the nut pair (550) and can reciprocate with the nut pair (550), and the first external spline shaft (560) is connected to the nut pair (550) and can reciprocate with the nut pair (550). (560) is located at the end of the screw (540), the torque storage and release device (300) includes a second external spline shaft (332), the gear reducer (200) includes at least a first-stage gear shaft (220) and a final-stage gear shaft (250), the first-stage gear shaft (220) is drivingly connected to the motor shaft of the motor (100), and the final-stage gear shaft (250) is a hollow internal spline shaft, one side of the internal spline shaft is meshed with the first external spline shaft (560), and the other side of the internal spline shaft is meshed with the second external spline shaft (332).

2. The electric lifting cylinder capable of storing and releasing return energy according to claim 1, characterized in that: The torque storage and release device (300) comprises a gear box (310), a first fixed gear shaft (330), a second fixed gear shaft (340), a coil spring gear shaft (350), a movable tightening gear shaft (360) and a movable reverse gear shaft (370); a transmission gear set is arranged on the first fixed gear shaft (330), the second fixed gear shaft (340), the coil spring gear shaft (350), the movable tightening gear shaft (360) and the movable reverse gear shaft (370); a coil spring is arranged on the coil spring gear shaft (350); the first fixed gear shaft (330), the second fixed gear shaft (340), the coil spring gear shaft (350), the movable tightening gear shaft (360) and the movable reverse gear shaft (370); The gear shaft (340) and the coil spring gear shaft (350) are both installed in the gear box (310) in a manner that they can rotate around an axis. A long arc track hole is provided on the gear box (310). The movable tightening gear shaft (360) and the movable reversing gear shaft (370) are both installed in their respective long arc track holes. When the movable tightening gear shaft (360) and the movable reversing gear shaft (370) move along their respective long arc track holes, the gears on the movable tightening gear shaft (360) and the movable reversing gear shaft (370) can enter or disengage from meshing transmission with the transmission gear set.

3. The electric lifting cylinder capable of storing and releasing return energy according to claim 2, characterized in that: The transmission gear set comprises a first-stage spur gear (331) arranged on the first fixed gear shaft (330), a second-stage large spur gear (341) and a second-stage small spur gear (342) arranged on the second fixed gear shaft (340), and a large-diameter thin spur gear (351) and a small-diameter thick spur gear (352) arranged on the coil spring gear shaft (350), a tightening gear (361) is arranged on the movable tightening gear shaft (360), and a first counter gear (370) is arranged on the movable counter gear shaft (370). The first-stage spur gear (331) is meshed with the second-stage large spur gear (341), the tightening gear (361) is capable of entering or disengaging from the meshing between the second-stage large spur gear (341) and the small-diameter thick spur gear (352), the first reversing gear (371) is capable of entering or disengaging from the meshing with the large-diameter thin spur gear (351), and the second reversing gear (372) is capable of entering or disengaging from the meshing with the second-stage small spur gear (342).

4. The electric lifting cylinder capable of storing and releasing return energy according to claim 1, characterized in that: The gear reducer (200) further comprises a reduction box (210), a second-stage gear shaft (230) and a third-stage gear shaft (240); the first-stage gear shaft (220), the second-stage gear shaft (230), the third-stage gear shaft (240) and the final-stage gear shaft (250) are all installed in the reduction box (210) in a manner capable of rotating around an axis, and the first-stage gear shaft (220), the second-stage gear shaft (230), the third-stage gear shaft (240) and the final-stage gear shaft (250) are provided with a reduction gear set that meshes with each other for transmission.

5. The electric lifting cylinder capable of storing and releasing return energy according to claim 1, characterized in that: The energy recovery device further comprises an overspeed clutch (400), and one end of the first-stage gear shaft (220) away from the motor (100) is connected to the overspeed clutch (400), and the overspeed clutch (400) is used to generate a braking torque to control the speed of rotation of the lead screw (540).

6. The electric lifting cylinder capable of storing and releasing return energy according to any one of claims 1 to 5, characterized in that: The transmission unit (500) further comprises a cylinder (510), a front bearing seat assembly (520), a rear bearing seat assembly (530) and a load connection unit (600); the lead screw (540) and the nut pair (550) are both located in the cylinder (510); the front bearing seat assembly (520) and the rear bearing seat assembly (530) are respectively mounted at two ends of the cylinder (510); the two ends of the lead screw (540) are supported by the front bearing seat assembly (520) and the rear bearing seat assembly (530); and the load connection unit (600) is connected to the nut pair (550) and can move with the nut pair (550).

7. The electric lifting cylinder capable of storing and releasing return energy according to claim 6, characterized in that: The load connection unit (600) comprises a push rod (610) and a rod head (620); the push rod (610) is sleeved outside the lead screw (540), one end of the push rod (610) is connected to the nut pair (550), and the other end of the push rod (610) is mounted with the rod head (620).

8. The electric lifting cylinder capable of storing and releasing return energy according to claim 7, characterized in that: The lead screw (540) comprises, from the front end to the rear end, a transmission threaded shaft section (541), a short cylindrical smooth shaft section (542) and a connecting threaded shaft section (543); the nut pair (550) is mounted on the transmission threaded shaft section (541); the short cylindrical smooth shaft section (542) cooperates with the rear bearing seat assembly (530); the connecting threaded shaft section (543) is used to mount a locking nut; and the first external spline shaft (560) is located at one end of the lead screw (540) close to the connecting threaded shaft section (543).

9. The electric lifting cylinder capable of storing and releasing return energy according to claim 8, characterized in that: A wear-resistant wheel is provided at the front end of the transmission threaded shaft section (541), and the wear-resistant wheel is used as a wear-resistant front end support of the lead screw (540) in the push rod (610) hole of the push rod (610).

10. The electric lifting cylinder capable of storing and releasing return energy according to claim 9, characterized in that: The nut pair (550) comprises a nut body (551), a connecting head (552) and a sealing end cover (553); the connecting head (552) and the sealing end cover (553) are respectively embedded at two ends of the nut body (551); the connecting head (552) is a round sleeve with an internal thread; the connecting head (552) is used to connect to the push rod (610).

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