Electric cylinder structure with lead screws connected in parallel

Abstract

The invention discloses an electric cylinder structure with lead screws connected in parallel, and belongs to the technical field of transmission devices.The electric cylinder structure with the lead screws connected in parallel comprises a cylinder shell, a piston rod and a lead screw transmission mechanism, and the lead screw transmission mechanism comprises the lead screws, nuts and a driving assembly; the driving assembly drives the lead screw to rotate in the cylinder shell, and then the nut is driven to do linear motion in the axis direction of the lead screw. The piston rod and the lead screw are arranged in parallel, the piston rod reciprocates in the cylinder shell, a force-equalizing damping plate with elastic self-recovery capability is fixed on the piston rod, and the force-equalizing damping plate is provided with an extension part extending outwards; a clamping plate is fixed on the nut, a gap is formed between the clamping plate and the nut, and the extending part is arranged in the gap. Vibration of the piston rod can be reduced, and the operation stability of the electric cylinder is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission devices, and in particular to an electric cylinder structure with a lead screw connected in parallel. Background Art

[0002] In the fields of engineering machinery, industrial automation, heavy equipment, etc., linear actuators are the core components for achieving linear motion. Among them, hydraulic cylinders (oil cylinders) have long occupied a mainstream position due to their large thrust output and high power density. However, the operation of hydraulic cylinders relies on hydraulic oil to transmit power, and there is a common problem of hydraulic oil leakage. Hydraulic oil leakage will not only pollute the production environment (such as in industries such as food, medicine, and electronics that have extremely high requirements for cleanliness, where pollution may cause product scrapping), but will also cause soil and water pollution, which does not comply with environmental protection regulations. With the advancement of industrial automation, intelligent manufacturing, and green manufacturing, the market is placing higher demands on linear drive technology—higher energy efficiency, more precise control, lower maintenance costs, cleaner and more environmentally friendly features, and easier integration of intelligent functions. Against this backdrop, electric cylinders have emerged as mechatronic solutions. Their inherent advantages perfectly align with these development trends, making them a potential alternative to hydraulic cylinders. However, when existing electric cylinders are used to replace hydraulic cylinders, there is a problem of piston rod vibration, which will have adverse effects in many scenarios. In the field of precision assembly, the vibration of the piston rod will lead to a decrease in assembly accuracy, resulting in deviations in the fit between parts, affecting the quality and performance of the product, and may even cause the product to be scrapped. In heavy equipment operations, vibrations will be transmitted to the entire equipment structure, which will not only increase the wear of parts and shorten the service life of the equipment, but may also affect the stability and safety of operations and increase the risk of accidents. In automated production lines, the vibration of the piston rod will interfere with the production rhythm, leading to errors in material transportation, processing and other links, reducing production efficiency and increasing production costs. In addition, long-term vibration will also generate loud noise, affecting the working environment and posing a potential threat to the health of operators.

[0003] Therefore, there is an urgent need for an electric cylinder structure with a screw in parallel to reduce the vibration problem of the piston rod, so as to better achieve an effective replacement and upgrade of the traditional hydraulic cylinder. Summary of the Invention

[0004] The purpose of the present invention is to address the defects and shortcomings in the prior art and provide an electric cylinder structure with a screw in parallel, so as to reduce the vibration of the piston rod and improve the operating stability of the electric cylinder.

[0005] To achieve the above object, the technical solution adopted by the present invention is: The present invention provides an electric cylinder structure with a screw in parallel, comprising a cylinder housing, a piston rod and a screw transmission mechanism, wherein the screw transmission mechanism comprises a screw, a nut and a drive assembly; the drive assembly drives the screw to rotate in the cylinder housing, driving the nut to perform linear motion along the axis of the screw; The piston rod is arranged in parallel with the lead screw, and the piston rod reciprocates in the cylinder housing. A force-equalizing and shock-absorbing plate with elastic self-restoring ability is fixed on the piston rod, and the force-equalizing and shock-absorbing plate is provided with an extension portion extending outward; A clamping plate is fixed on the nut, a gap is provided between the clamping plate and the nut, and the extension portion is arranged in the gap.

[0006] In one embodiment, limiting connecting columns are fixed at both ends of the nut, and the vertical height of the limiting connecting columns is greater than the vertical height of the nut; both ends of the clamping plate are connected to the limiting connecting columns; supporting bosses are fixed on the surface of the clamping plate facing the extension part and on the surface of the nut facing the extension part, and the supporting bosses are in contact with the extension part.

[0007] In one embodiment, the extension portion is U-shaped, the U-shaped opening of the extension portion is used to pass the lead screw, and there is a gap between the inner peripheral wall of the U-shaped opening and the lead screw.

[0008] In one embodiment, an annular boss is fixed on the piston rod, a first through hole is opened on the force equalizing and shock absorbing plate, the outer diameter of the annular boss is larger than the inner diameter of the first through hole, and the force equalizing and shock absorbing plate is fixed to the annular boss by bolts.

[0009] In one embodiment, a plurality of the screw transmission mechanisms are provided circumferentially on the piston rod, and a plurality of the nuts of the plurality of the screw transmission mechanisms are fixed on a positioning plate; a second through hole for the piston rod to pass through is formed on the positioning plate, and a third through hole for the screw to pass through is formed on the positioning plate; The extension parts are arranged at intervals in the circumferential direction on the force-equalizing and shock-absorbing plate, and avoidance spaces for the position-limiting connecting columns to pass through are provided between adjacent extension parts.

[0010] In one embodiment, the driving assembly includes a driving wheel and a driving motor, wherein the driving motor drives the driving wheel to rotate, and a driven wheel is coaxially fixed to the lead screw, and the driven wheel is meshed with the driving wheel; When a plurality of the screw transmission mechanisms are arranged circumferentially on the piston rod, the driving wheel is located at the center of the plurality of the driven wheels.

[0011] In one embodiment, an air pipe is further included, one end of which is connected to the cylinder shell, and the other end is connected to the air source processing unit. The air pipe is used to balance the air pressure in the cylinder shell.

[0012] In one embodiment, a lubrication unit is also included, which includes an oil injection pipe, a return pipe and an oil tank; one end of the oil injection pipe is connected to the oil tank, and the other end is connected to the top of the cylinder shell; one end of the return pipe is connected to the bottom of the cylinder shell, and the other end is connected to the oil tank; the return pipe is used to transport the oil collected at the bottom of the cylinder shell to the oil tank; an oil pump for transporting the oil is provided in the oil tank.

[0013] In one embodiment, the oil injection pipe includes an oil injection main pipe and an annular nozzle; one end of the oil injection main pipe is connected to the oil tank, and the other end is connected to the annular nozzle; the annular nozzle is fixed to the outer wall of the cylinder shell, and the annular nozzle is provided with nozzles or nozzles at circumferential intervals. A through hole compatible with the nozzles or nozzles is provided circumferentially on the cylinder shell, and the nozzles are connected to the through hole. The annular nozzle is used to spray oil circumferentially into the cylinder shell.

[0014] In one embodiment, both ends of the lead screw are rotatably connected to a first bearing and a second bearing respectively, and the first bearing and the second bearing are fixed to both ends of the cylinder housing respectively.

[0015] Compared with the prior art, the present invention has achieved the following technical effects: By setting up a force-equalizing shock-absorbing plate with elastic self-recovery ability, and setting its extended part in the gap between the clamping plate and the nut, when the screw or workload (connected to the piston rod) vibrates, the force-equalizing shock-absorbing plate can absorb vibration energy through elastic deformation and cushion the impact through self-recovery ability, effectively reducing vibration transmission and solving the problem of vibration of the existing electric cylinder piston rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a structural schematic diagram of an electric cylinder structure with a lead screw connected in parallel, disclosed in a specific embodiment of the present invention; Figure 2 This is a schematic diagram of a portion of the structure of an electric cylinder with a lead screw in parallel disclosed in a specific embodiment of the present invention; Figure 3 A specific embodiment of the present invention is disclosed Figure 2 A magnified view of point A; Figure 4This is another partial structural schematic diagram of the electric cylinder structure with a lead screw in parallel disclosed in a specific embodiment of the present invention; Figure 5 A specific embodiment of the present invention is disclosed Figure 4 Enlarged view of point B; Figure 6 A specific embodiment of the present invention is disclosed Figure 4 Enlarged view of point C; Figure 7 This is another schematic diagram of a structure of a part of an electric cylinder structure with a lead screw connected in parallel disclosed in a specific embodiment of the present invention; Figure 8 A specific embodiment of the present invention is disclosed Figure 7 Enlarged view of point D; Figure 9 A schematic structural diagram of a positioning plate disclosed in a specific embodiment of the present invention; Figure 10 It is a structural schematic diagram of a force-equalizing vibration-damping plate disclosed in a specific embodiment of the present invention; Figure 11 A schematic structural diagram of a clamping plate disclosed in a specific embodiment of the present invention; Among them, 11, cylinder; 12, front end cover; 13, rear end cover; 14, driven wheel; 15, driving wheel; 16, piston rod; 161, annular boss; 17, first bearing; 18, second bearing; 20. Screw; 21. Nut; 211. Positioning connecting column; 22. Positioning plate; 221. Second through hole; 222. Third through hole; 23. Force-equalizing and shock-absorbing plate; 231. Extension; 232. Avoidance space; 233. First through hole; 24. Clamping plate; 25. Support boss; 30. Air pipe; 41. Fuel injection pipe; 42. Annular nozzle; 43. Fuel tank; 44. Return pipe. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] like Figures 1-11As shown, the present invention provides an electric cylinder structure with a screw in parallel, including a cylinder housing, a piston rod 16 and a screw transmission mechanism, the screw transmission mechanism including a screw 20, a nut 21 and a drive assembly; the drive assembly drives the screw 20 to rotate in the cylinder housing, driving the nut 21 to make a linear motion along the axis direction of the screw 20; the piston rod 16 is arranged parallel to the screw 20, and the piston rod 16 makes a reciprocating motion in the cylinder housing, and a force-equalizing shock-absorbing plate 23 with elastic self-recovery ability is fixed on the piston rod 16, and the force-equalizing shock-absorbing plate 23 is provided with an outwardly extending extension portion 231; a clamping plate 24 is fixed on the nut 21, and there is a gap between the clamping plate 24 and the nut 21, and the extension portion 231 is arranged in the gap.

[0021] It can be understood that by providing an equalizing shock-absorbing plate 23 with elastic self-recovery ability, whose extension part 231 is provided in the gap between the clamping plate 24 and the nut 21, when the screw 20 or the workload (connected to the piston rod 16) generates vibration, the equalizing shock-absorbing plate 23 can absorb the vibration energy through elastic deformation and cushion the impact through self-recovery ability, thereby effectively reducing the vibration transmission and alleviating the vibration problem of the existing electric cylinder piston rod 16.

[0022] The functions of the force-equalizing damping plate 23 are as follows: 1. When the lead screw 20 rotates, the thrust or pull of the nut 21 is transmitted through the force-equalizing damping plate 23 to the piston rod 16. During operation, the force-equalizing damping plate 23 deforms appropriately, effectively reducing vibration transmission. 2. It mitigates the vibration impact generated by the load (connected to the piston rod 16), preventing damage to the lead screw 20.

[0023] It should be noted that the clamping plate 24 has a through slot for passing the lead screw 20. The through slot in the clamping plate 24 does not affect the operation of the lead screw 20. For example, a gap may be provided between the through slot and the lead screw 20. The clamping plate 24 is connected to the nut 21 by a bolt. The force-equalizing and shock-absorbing plate 23 can be made of a material with elastic self-recovery capabilities (such as spring steel or an elastic composite material).

[0024] In some specific embodiments, limiting connecting columns 211 are fixed at both ends of the nut 21, and the vertical height of the limiting connecting columns 211 is greater than the vertical height of the nut 21; both ends of the clamping plate 24 are connected to the limiting connecting columns 211; support bosses 25 are fixed on the surface of the clamping plate 24 facing the extension portion 231 and on the surface of the nut 21 facing the extension portion 231, and the support bosses 25 are in contact with the extension portion 231.

[0025] It is understandable that the design of the limiting connecting column 211 provides a gap between the clamping plate 24 and the nut 21. The design of the supporting boss 25 ensures effective force transmission, prevents the extension portion 231 from moving up and down within the gap, and improves the shock absorption effect.

[0026] It should be noted that the support boss 25 can be a semi-cylindrical structure. When the arc surface of the support boss 25 contacts the extension 231, the contact area can be reduced without affecting the deformation of the extension 231. When the screw 20 moves, the force-equalizing damping plate 23 deforms. When the deformation is small, the force-equalizing damping plate 23 absorbs part of the vibration energy through its own elastic deformation. When the deformation is too large, the extension 231 of the force-equalizing damping plate 23 and the support boss 25 (semi-cylindrical structure) will slightly displace, generating dry friction, further consuming vibration energy, converting the mechanical energy of the vibration into heat energy and dissipating it, achieving secondary vibration attenuation. By setting the force-equalizing damping plate 23 and the support boss 25, elastic deformation and dry friction occur to achieve vibration attenuation, thereby improving the shock absorption effect.

[0027] In some specific embodiments, the extension portion 231 is U-shaped, and the U-shaped opening of the extension portion 231 is used to pass the lead screw 20 , and there is a gap between the inner peripheral wall of the U-shaped opening and the lead screw 20 .

[0028] It is understandable that the gap between the inner peripheral wall of the U-shaped opening of the extension portion 231 and the lead screw 20 is set to avoid structural interference and ensure smooth movement of the lead screw 20.

[0029] In some specific embodiments, an annular boss 161 is fixed on the piston rod 16, a first through hole 233 is opened on the force equalizing and shock absorbing plate 23, the outer diameter of the annular boss 161 is larger than the inner diameter of the first through hole 233, and the force equalizing and shock absorbing plate 23 is fixed to the annular boss 161 by bolts.

[0030] It is understandable that the force balancing and damping plate 23 is connected to the annular boss 161 by bolts to ensure that the force balancing and damping plate 23 and the piston rod 16 are firmly fixed to avoid relative movement between the force balancing and damping plate 23 and the piston rod 16 to generate additional vibration.

[0031] In order to increase the output thrust, in some specific embodiments, multiple screw transmission mechanisms are arranged circumferentially on the piston rod 16, and multiple nuts 21 of the multiple screw transmission mechanisms are all fixed on the positioning plate 22; a second through hole 221 for the piston rod 16 to pass through is provided on the positioning plate 22, and a third through hole 222 for the screw 20 to pass through is provided on the positioning plate 22; extension portions 231 are provided at intervals circumferentially on the force balancing and shock absorbing plate 23, and avoidance spaces 232 for limiting the passage of the connecting column 211 are provided between adjacent extension portions 231.

[0032] It is understandable that the multi-screw transmission mechanism cooperates with the positioning plate 22 to fix multiple nuts 21 on the same horizontal plane, thereby improving the output thrust and movement synchronization, and avoiding vibration or deviation of the piston rod 16 due to uneven force.

[0033] The avoidance space 232 is located between the adjacent extensions 231 of the force-equalizing and shock-absorbing plate 23, for the limiting connecting column 211 to pass through, so that the two limiting connecting columns 211 on the nut 21 limit the extension 231 in the left and right directions, preventing the extension 231 from moving left and right within the interval to buffer vibration and enhance the shock-absorbing effect.

[0034] At this point, the force-equalizing and damping plates 23 serve the following functions: 1. When the multiple lead screws 20 rotate, the thrust or pull of the multiple nuts 21 is transmitted in parallel through the force-equalizing and damping plates 23 to the piston rod 16. When the electric cylinder is operating, the force-equalizing and damping plates 23 can appropriately plastically deform, effectively reducing vibration transmission and balancing the working force of each lead screw 20. 2. They mitigate the vibration impact generated by the workload (connected to the piston rod 16) to prevent damage to the lead screws 20.

[0035] In some specific embodiments, the driving assembly includes a driving wheel 15 and a driving motor. The driving motor drives the driving wheel 15 to rotate. A driven wheel 14 is coaxially fixed to the lead screw 20. The driven wheel 14 is meshed with the driving wheel 15. When multiple screw transmission mechanisms are provided circumferentially on the piston rod 16 , the driving wheel 15 is located at the center of the multiple driven wheels 14 .

[0036] It is understood that when there is only one screw transmission mechanism, it includes one driving wheel 15 and one driven wheel 14. When there are multiple screw transmission mechanisms, it includes one driving wheel 15 and multiple driven wheels 14. The central driving wheel 15 is meshed with multiple driven wheels 14 in the circumferential direction to ensure the synchronization of the rotation of multiple screws 20 and avoid vibration caused by drive differences.

[0037] In some specific embodiments, the electric cylinder structure with a lead screw in parallel further includes an air pipe 30 , one end of which is connected to the cylinder housing, and the other end of which is connected to the air source processing unit. The air pipe 30 is used to balance the air pressure in the cylinder housing.

[0038] It is understandable that the air source processing unit includes a filter, a pressure reducing valve, etc. The air pipe 30 and the air source processing unit are used to balance the air pressure in the cylinder shell and prevent dust and water vapor from entering the interior of the cylinder shell. Specifically, the air pipe 30 can promptly transmit the air pressure changes in the cylinder shell to the air source processing unit, and the pressure reducing valve can adjust the pressure of the external air source to a range that is compatible with the cylinder shell. When the air pressure in the cylinder shell is too high, the excess gas is discharged to the air source processing unit through the air pipe 30; when a negative pressure is formed in the cylinder shell, the treated external gas is replenished into the cylinder shell through the air pipe 30, thereby always maintaining the stability of the air pressure in the cylinder shell. The filter can effectively filter dust, impurities and moisture in the air, prevent these pollutants from entering the interior of the cylinder shell, prevent precision components such as the screw 20 and nut 21 from being worn or corroded, and ensure the service life and operating accuracy of the electric cylinder.

[0039] For example, when used in special operation vehicles, the air pipe 30 is guided into the cylinder housing, and the air pipe 30 is led from the cylinder housing to the air source in the cab. A filter is connected to the air pipe 30 to filter dust, impurities and moisture in the air to prevent these pollutants from entering the cylinder housing, preventing precision components such as the screw 20 and nut 21 from being worn or corroded, and ensuring the service life and operating accuracy of the electric cylinder.

[0040] In some specific embodiments, the electric cylinder structure with a screw in parallel also includes a lubrication unit, which includes an oil injection pipe, a return pipe 44 and an oil tank 43; one end of the oil injection pipe is connected to the oil tank 43, and the other end is connected to the top of the cylinder shell; one end of the return pipe 44 is connected to the bottom of the cylinder shell, and the other end is connected to the oil tank 43; the return pipe 44 is used to transport the oil collected at the bottom of the cylinder shell to the oil tank 43; an oil pump for transporting oil is provided in the oil tank 43.

[0041] It is understood that the lubrication unit can spray oil into the cylinder housing to lubricate the screw 20, reducing friction, increasing the service life of the screw 20, and ensuring smooth operation of the electric cylinder. The return pipe 44 allows excess lubricating oil to flow back to the oil tank 43, achieving recycling and saving resources.

[0042] It should be noted that, under the action of gravity, the oil entering from the top of the cylinder housing collects at the bottom of the cylinder housing, and is then transported from the bottom of the cylinder housing through return pipe 44 to the oil tank 43 (located below the bottom of the cylinder housing). If the oil tank 43 is higher than the bottom of the cylinder housing, or the cylinder housing is not positioned vertically, and the oil cannot flow from the top to the bottom of the cylinder housing under the action of gravity, an oil pump can be provided on return pipe 44 to transport the oil collected at the bottom of the cylinder housing to the oil tank 43.

[0043] In some specific embodiments, the oil injection pipe includes an oil injection main pipe 41 and an annular nozzle 42; one end of the oil injection main pipe 41 is connected to the oil tank 43, and the other end is connected to the annular nozzle 42; the annular nozzle 42 is fixed on the outer wall of the cylinder shell, and the annular nozzle 42 is provided with nozzles or nozzles at intervals in the circumference. A through hole adapted to the nozzle or nozzle is provided circumferentially on the cylinder shell, and the nozzle is connected to the through hole. The annular nozzle 42 is used to spray oil circumferentially into the cylinder shell.

[0044] It is understandable that the annular nozzle 42 can spray oil toward the lead screw 20 from the circumferential direction, thereby evenly lubricating the lead screw 20 and improving the lubrication effect.

[0045] In some specific embodiments, both ends of the lead screw 20 are rotatably connected to the first bearing 17 and the second bearing 18 , respectively. The first bearing 17 and the second bearing 18 are fixed to both ends of the cylinder housing, respectively.

[0046] It will be appreciated that the first bearing 17 and the second bearing 18 are used to ensure smooth rotation of the lead screw 20. Specifically, the cylinder housing includes a cylinder barrel 11, a front end cover 12 covering the front end of the cylinder barrel 11, and a rear end cover 13 covering the rear end of the cylinder barrel 11. The ends of the lead screw 20 are rotatably connected to the first bearing 17 fixed to the front end cover 12 and the second bearing 18 fixed to the rear end cover 13, respectively. The first bearing 17 and the second bearing 18 are respectively disposed at each end of the lead screw 20 to reduce frictional resistance during rotation of the lead screw 20, ensuring high-speed and stable rotation of the lead screw 20.

[0047] Working Principle: The drive motor rotates the driving wheel 15, which, through engagement with the driven wheel 14, drives the lead screw 20 in synchronous rotation. The nut 21 moves linearly on the lead screw 20, pushing the extension 231 of the force-equalizing and damping plate 23 through the clamping plate 24 and support boss 25, thereby driving the piston rod 16 in reciprocating motion. During this motion, the elastic self-restoring capacity of the force-equalizing and damping plate 23 absorbs and dampens the vibration of the piston rod 16. The lubrication unit provides excellent lubrication for the lead screw 20 and nut 21, reducing friction and vibration. The air pipe 30 balances the air pressure within the cylinder housing, ensuring smooth movement.

[0048] When multiple screw transmission mechanisms are arranged circumferentially on the piston rod 16, the positioning plate 22 ensures the synchronous movement of multiple nuts 21 to prevent the piston rod 16 from swinging; the central driving wheel 15 and the multiple driven wheels 14 in the circumference ensure the synchronous rotation of multiple screws 20 to avoid vibration caused by drive differences.

[0049] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all perspectives, the embodiments should be regarded as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description. It is intended that all changes that fall within the meaning and range of equivalents of the claims be included in the present invention, and any reference signs in the claims should not be construed as limiting the claims to which they relate.

Claims

1. A screw-parallel electric cylinder structure, characterized in that: It includes a cylinder housing, a piston rod and a screw transmission mechanism, wherein the screw transmission mechanism includes a screw, a nut and a drive assembly; the drive assembly drives the screw to rotate in the cylinder housing, driving the nut to perform linear motion along the axis of the screw; The piston rod is arranged in parallel with the lead screw, and the piston rod reciprocates in the cylinder housing. A force-equalizing and shock-absorbing plate with elastic self-restoring ability is fixed on the piston rod, and the force-equalizing and shock-absorbing plate is provided with an extension portion extending outward; A clamping plate is fixed on the nut, a gap is provided between the clamping plate and the nut, and the extension portion is arranged in the gap.

2. The electric cylinder structure with a lead screw in parallel according to claim 1, characterized in that: The two ends of the nut are fixed with limiting connecting columns, and the vertical height of the limiting connecting columns is greater than the vertical height of the nut; the two ends of the clamping plate are connected to the limiting connecting columns; support bosses are fixed on the surface of the clamping plate facing the extension part and on the surface of the nut facing the extension part, and the support bosses are in contact with the extension part.

3. The electric cylinder structure with a lead screw in parallel according to claim 1, characterized in that: The extension portion is U-shaped, and the U-shaped opening of the extension portion is used for passing the lead screw. There is a gap between the inner peripheral wall of the U-shaped opening and the lead screw.

4. The electric cylinder structure with a lead screw in parallel according to claim 1, characterized in that: An annular boss is fixed on the piston rod, a first through hole is opened on the force equalizing and shock absorbing plate, the outer diameter of the annular boss is larger than the inner diameter of the first through hole, and the force equalizing and shock absorbing plate is fixed on the annular boss by bolts.

5. The electric cylinder structure with parallel connection of lead screws according to claim 2, characterized in that: A plurality of screw transmission mechanisms are provided circumferentially on the piston rod, and a plurality of nuts of the plurality of screw transmission mechanisms are fixed on a positioning plate; a second through hole for the piston rod to pass through is provided on the positioning plate, and a third through hole for the screw to pass through is provided on the positioning plate; The extension parts are arranged at intervals in the circumferential direction on the force-equalizing and shock-absorbing plate, and avoidance spaces for the position-limiting connecting columns to pass through are provided between adjacent extension parts.

6. The electric cylinder structure with a lead screw in parallel according to claim 5, characterized in that: The driving assembly includes a driving wheel and a driving motor, wherein the driving motor drives the driving wheel to rotate, and a driven wheel is coaxially fixed to the lead screw, and the driven wheel is meshed with the driving wheel; When a plurality of the screw transmission mechanisms are arranged circumferentially on the piston rod, the driving wheel is located at the center of the plurality of the driven wheels.

7. The electric cylinder structure with a lead screw in parallel according to claim 1, characterized in that: It also includes an air pipe, one end of which is connected to the cylinder shell, and the other end is connected to the air source processing unit. The air pipe is used to balance the air pressure in the cylinder shell.

8. The electric cylinder structure with a lead screw in parallel according to claim 1, characterized in that: It will also include a lubrication unit, which includes an oil injection pipe, a return pipe and an oil tank; one end of the oil injection pipe is connected to the oil tank, and the other end is connected to the top of the cylinder shell; one end of the return pipe is connected to the bottom of the cylinder shell, and the other end is connected to the oil tank; the return pipe is used to transport the oil collected at the bottom of the cylinder shell into the oil tank; an oil pump for transporting oil is provided in the oil tank.

9. The electric cylinder structure with parallel connection of lead screws according to claim 8, characterized in that: The oil injection pipe includes an oil injection main pipe and an annular nozzle; one end of the oil injection main pipe is connected to the oil tank, and the other end is connected to the annular nozzle; the annular nozzle is fixed to the outer wall of the cylinder shell, and the annular nozzle is circumferentially provided with nozzles or nozzles, and the cylinder shell is circumferentially provided with through holes adapted to the nozzles or nozzles, and the nozzles are connected to the through holes, and the annular nozzle is used to circumferentially spray oil into the cylinder shell.

10. The electric cylinder structure with a lead screw in parallel according to claim 1, characterized in that: Both ends of the lead screw are rotatably connected to a first bearing and a second bearing respectively, and the first bearing and the second bearing are fixed to both ends of the cylinder housing respectively.

Images