A screw-parallel electric cylinder structure

Abstract

The application discloses a screw-parallel electric cylinder structure and belongs to the technical field of transmission devices. The screw-parallel electric cylinder structure comprises a cylinder shell, a piston rod and a screw transmission mechanism. The screw transmission mechanism comprises a screw, a nut and a driving assembly. The driving assembly drives the screw to rotate in the cylinder shell, and further drives the nut to move linearly along the axis direction of the screw. The piston rod is arranged in parallel with the screw, and reciprocates in the cylinder shell. The piston rod is fixed with an equal force shock absorbing plate with elastic self-recovery capability. The equal force shock absorbing plate is provided with an extension part extending outward. The nut is fixed with a clamping plate. The clamping plate is spaced apart from the nut, and the extension part is arranged in the space. The application can reduce the vibration of the piston rod and improve the operation stability of the electric cylinder.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transmission devices, in particular to a screw rod parallel electric cylinder structure. BACKGROUND

[0002] In the fields of engineering machinery, industrial automation, heavy equipment, etc., linear actuators are the core components for realizing linear motion. Among them, hydraulic cylinders (oil cylinders) have long occupied the mainstream position due to their large thrust output and high power density.

[0003] 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 not only pollutes the production environment (such as food, medicine, electronics, etc. which have extremely high cleanliness requirements, and pollution may cause product scrap), but also causes soil and water pollution, which does not meet the requirements of environmental protection regulations.

[0004] With the development of industrial automation, intelligentization and green manufacturing, the market has put forward higher requirements for linear driving technology - higher energy efficiency, more accurate control, lower maintenance cost, cleaner environment and easier integration of intelligent functions. Under this background, electric cylinders as mechatronics solutions have emerged as the times require, and their inherent advantages perfectly match the above development trend, becoming a potential preferred solution to replace hydraulic cylinders.

[0005] However, the existing electric cylinders have the problem of piston rod vibration when replacing hydraulic cylinders, which will have adverse effects in many scenarios. In the field of precision assembly, the vibration of the piston rod will cause the assembly precision to decrease, causing deviations in the cooperation between parts, affecting the quality and performance of the product, and even causing the product to be scrapped. In heavy equipment operation, vibration will be transmitted to the entire equipment structure, not only exacerbating the wear of parts, shortening the service life of the equipment, but also affecting the stability and safety of the operation, increasing the risk of accidents. In the automated production line, the vibration of the piston rod will interfere with the production rhythm, causing errors in material conveying, processing, etc., reducing production efficiency and increasing production cost. In addition, long-term vibration will also produce a lot of noise, affecting the working environment and posing a potential threat to the health of operators.

[0006] Therefore, there is an urgent need for a screw rod parallel electric cylinder structure to reduce the vibration of the piston rod, so as to better realize the effective replacement and upgrading of traditional hydraulic cylinders. SUMMARY

[0007] The present application aims to overcome the defects and deficiencies in the prior art, and provides a screw rod parallel electric cylinder structure to reduce the vibration of the piston rod and improve the running stability of the electric cylinder.

[0008] To achieve the above-mentioned purpose, the technical solution adopted by the present application is:

[0009] The application provides a screw-parallel electric cylinder structure, which comprises a cylinder shell, a piston rod and a screw transmission mechanism, the screw transmission mechanism comprises a screw, a nut and a driving assembly; the driving assembly drives the screw to rotate in the cylinder shell, and drives the nut to move linearly along the axis of the screw;

[0010] The piston rod is arranged in parallel with the screw, the piston rod moves reciprocatingly in the cylinder shell, a uniform force damping plate with elastic self-recovery capability is fixed on the piston rod, and the uniform force damping plate is provided with an extension part extending outward.

[0011] A clamping plate is fixed on the nut, and a gap is formed between the clamping plate and the nut, and the extension part is arranged in the gap.

[0012] In an embodiment, the two ends of the nut are fixed with limiting connecting columns, 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 with the limiting connecting columns, and a supporting boss is 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 boss is in contact with the extension part.

[0013] In an embodiment, the extension part is U-shaped, the U-shaped opening of the extension part is used for passing through the screw, and a gap is formed between the inner circumferential wall of the U-shaped opening and the screw.

[0014] In an embodiment, an annular boss is fixed on the piston rod, a first through hole is formed in the uniform force damping plate, the outer diameter of the annular boss is greater than the inner diameter of the first through hole, and the uniform force damping plate is fixed on the annular boss through bolts.

[0015] In an embodiment, a plurality of the screw transmission mechanisms are arranged circumferentially on the piston rod, and the plurality of nuts of the plurality of screw transmission mechanisms are fixed on a positioning disc; a second through hole for the piston rod to pass through is formed in the positioning disc, and a third through hole for the screw to pass through is formed in the positioning disc.

[0016] The extension parts are arranged circumferentially and spaced apart on the uniform force damping plate, and an avoiding space for the limiting connecting columns to pass through is arranged between adjacent extension parts.

[0017] In an embodiment, the driving assembly comprises a driving wheel and a driving motor, the driving motor drives the driving wheel to rotate, a driven wheel is fixed coaxially on the screw, and the driven wheel is engaged with the driving wheel.

[0018] When a plurality of the screw transmission mechanisms are arranged circumferentially on the piston rod, the driving wheel is located at the central position of the plurality of driven wheels.

[0019] In an embodiment, a gas pipe is further included, one end of the gas pipe is communicated with the cylinder shell, and the other end is connected with a gas source processing unit, and the gas pipe is used for balancing the air pressure in the cylinder shell.

[0020] In an embodiment, a lubricating unit is further included, the lubricating unit includes an oil injection pipe, a return pipe and an oil tank, one end of the oil injection pipe is communicated with the oil tank, and the other end is communicated with the top of the cylinder shell, one end of the return pipe is communicated with the bottom of the cylinder shell, and the other end is communicated with the oil tank, the return pipe is used for conveying the oil collected at the bottom of the cylinder shell into the oil tank, and the oil tank is provided with an oil pump for conveying oil.

[0021] In an embodiment, the oil injection pipe includes an oil injection main pipe and an annular oil injection pipe, one end of the oil injection main pipe is communicated with the oil tank, and the other end is communicated with the annular oil injection pipe, the annular oil injection pipe is fixed on the outer wall of the cylinder shell, the annular oil injection pipe is provided with injection ports or nozzles at intervals in the circumferential direction, the cylinder shell is provided with through holes in the circumferential direction and matched with the injection ports or nozzles, the injection ports are communicated with the through holes, and the annular oil injection pipe is used for spraying oil into the cylinder shell in the circumferential direction.

[0022] In an embodiment, the two ends of the lead screw are rotatably connected with a first bearing and a second bearing respectively, and the first bearing and the second bearing are fixed at the two ends of the cylinder shell respectively.

[0023] The present application has the following technical effects relative to the prior art:

[0024] By arranging the uniform force shock-absorbing plate with elastic self-recovery capability, the extension part of the uniform force shock-absorbing plate is arranged in the interval between the clamping plate and the nut, when the lead screw or the working load (connected with the piston rod) vibrates, the uniform force shock-absorbing plate can absorb the vibration energy through elastic deformation, and buffer the impact through the self-recovery capability, effectively reduce the vibration transmission, and solve the problem of vibration of the piston rod of the existing electric cylinder. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0026] Figure 1 It is a structure schematic view of the electric cylinder structure of the lead screw parallel connection disclosed in one specific embodiment of the present application;

[0027] Figure 2 It is a part of the structure schematic view of the electric cylinder structure of the lead screw parallel connection disclosed in one specific embodiment of the present application;

[0028] Figure 3 Fig. 1 is a structural schematic diagram of a screw-rod parallel electric cylinder structure according to an embodiment of the present application; Figure 2 Fig. 2 is an enlarged view of A in Fig. 1;

[0029] Figure 4 Fig. 3 is another structural schematic diagram of the screw-rod parallel electric cylinder structure according to an embodiment of the present application;

[0030] Figure 5 Fig. 4 is an enlarged view of B in Fig. 3; Figure 4

[0031] Figure 6 Fig. 5 is an enlarged view of C in Fig. 4; Figure 4

[0032] Figure 7 Fig. 6 is still another structural schematic diagram of the screw-rod parallel electric cylinder structure according to an embodiment of the present application;

[0033] Figure 8 Fig. 7 is an enlarged view of D in Fig. 6; Figure 7

[0034] Figure 9 Fig. 8 is a structural schematic diagram of a positioning disc according to an embodiment of the present application;

[0035] Figure 10 Fig. 9 is a structural schematic diagram of an equal-force damping plate according to an embodiment of the present application;

[0036] Figure 11 Fig. 10 is a structural schematic diagram of a clamping plate according to an embodiment of the present application;

[0037] wherein 11 is a cylinder barrel, 12 is a front end cover, 13 is a rear end cover, 14 is a driven wheel, 15 is a driving wheel, 16 is a piston rod, 161 is an annular boss, 17 is a first bearing, and 18 is a second bearing;

[0038] 20 is a screw rod, 21 is a nut, 211 is a limiting connecting column, 22 is a positioning disc, 221 is a second through hole, 222 is a third through hole, 23 is an equal-force damping plate, 231 is an extension, 232 is a space for avoiding collision, 233 is a first through hole, 24 is a clamping plate, and 25 is a supporting boss;

[0039] 30 is an air pipe, 41 is an oil injection main pipe, 42 is an annular injection pipe, 43 is an oil tank, and 44 is a backflow pipe. DETAILED DESCRIPTION

[0040] ​​​With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described, obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0041] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0042] As shown in Figures 1-11 The present application provides a screw parallel electric cylinder structure, which comprises a cylinder shell, a piston rod 16 and a screw transmission mechanism, the screw transmission mechanism comprises a screw 20, a nut 21 and a driving assembly; the driving assembly drives the screw 20 to rotate in the cylinder shell, and drives the nut 21 to move linearly along the axis direction of the screw 20; the piston rod 16 is arranged in parallel with the screw 20, and the piston rod 16 moves reciprocatingly in the cylinder shell; a uniform force shock absorbing plate 23 with elastic self-recovery ability is fixed on the piston rod 16; the uniform force shock absorbing plate 23 is provided with an extension part 231 extending outward; a clamping plate 24 is fixed on the nut 21, and there is a gap between the clamping plate 24 and the nut 21; the extension part 231 is arranged in the gap.

[0043] It can be understood that, by arranging the uniform force shock absorbing plate 23 with elastic self-recovery ability, the extension part 231 of the uniform force shock absorbing plate 23 is arranged in the gap between the clamping plate 24 and the nut 21, when the screw 20 or the working load (connected with the piston rod 16) vibrates, the uniform force shock absorbing plate 23 can absorb the vibration energy through elastic deformation, and buffer the impact through the self-recovery ability, thereby effectively reducing the vibration transmission and reducing the problem of vibration of the existing electric cylinder piston rod 16.

[0044] The functions of the uniform force shock absorbing plate 23 are as follows: 1. When the screw 20 rotates, the pushing force or pulling force of the nut 21 is transmitted to the piston rod 16 through the uniform force shock absorbing plate 23, and the uniform force shock absorbing plate 23 can be appropriately plastically deformed when the electric cylinder works, thereby effectively reducing the vibration transmission. 2. The vibration impact generated by the working load (connected with the piston rod 16) is reduced, and the screw 20 is prevented from being damaged.

[0045] It should be noted that a through slot is formed on the clamping plate 24, the through slot is used to pass through the screw 20, and the through slot on the clamping plate 24 does not affect the operation of the screw 20, for example, a gap can be arranged between the through slot and the screw 20. The clamping plate 24 and the nut 21 are connected by bolts. The uniform force shock absorbing plate 23 can be made of a material with elastic self-recovery ability (such as spring steel, elastic composite material, etc.).

[0046] In some specific embodiments, the two ends of the nut 21 are fixed with limiting connecting columns 211, the vertical height of the limiting connecting columns 211 is greater than the vertical height of the nut 21; the two ends of the clamping plate 24 are connected with the limiting connecting columns 211; the surface of the clamping plate 24 facing the extension 231 and the surface of the nut 21 facing the extension 231 are both fixed with support bosses 25, and the support bosses 25 are in contact with the extension 231.

[0047] It can be understood that the design of the limiting connecting columns 211 makes the clamping plate 24 and the nut 21 have a spacing. The design of the support bosses 25 ensures effective force transmission and prevents the extension 231 from moving up and down in the spacing, thereby improving the damping effect.

[0048] It should be noted that the support bosses 25 can be semi-cylindrical structures. When the arc surface of the support bosses 25 is in contact with the extension 231, the contact area can be reduced, and the deformation of the extension 231 is not affected. When the uniform force damping plate 23 moves with the lead screw 20, it deforms. When the deformation is small, the uniform force damping plate 23 absorbs part of the vibration energy through its elastic deformation; when the deformation is too large, the extension 231 of the uniform force damping plate 23 and the support bosses 25 (semi-cylindrical structure) will slightly displace, generate dry friction, further consume vibration energy, convert mechanical energy into heat energy, and dissipate, thereby achieving secondary attenuation of vibration. By setting the uniform force damping plate 23 and the support bosses 25, elastic deformation and dry friction are generated to achieve vibration attenuation and improve the damping effect.

[0049] In some specific embodiments, the extension 231 is U-shaped, and the U-shaped opening of the extension 231 is used to pass through the lead screw 20, and the inner peripheral wall of the U-shaped opening has a gap with the lead screw 20.

[0050] It can be understood that the gap between the inner peripheral wall of the U-shaped opening of the extension 231 and the lead screw 20 avoids structural interference and ensures smooth movement of the lead screw 20.

[0051] In some specific embodiments, the piston rod 16 is fixed with an annular boss 161, the uniform force damping plate 23 is provided with a first through hole 233, the outer diameter of the annular boss 161 is greater than the inner diameter of the first through hole 233, and the uniform force damping plate 23 is fixed on the annular boss 161 by bolts.

[0052] It can be understood that the uniform force damping plate 23 is connected to the annular boss 161 by bolts, which ensures that the uniform force damping plate 23 and the piston rod 16 are firmly fixed, and avoids additional vibration caused by relative movement between the uniform force damping plate 23 and the piston rod 16.

[0053] To improve the output thrust, in some embodiments, a plurality of screw rod transmission mechanisms are arranged on the piston rod 16 in a circumferential direction, and a plurality of nuts 21 of the plurality of screw rod transmission mechanisms are fixed on the positioning disc 22; the positioning disc 22 is provided with a second through hole 221 for the piston rod 16 to pass through, and is provided with a third through hole 222 for the screw rod 20 to pass through; the uniform force shock absorbing plate 23 is provided with an extension part 231 in a circumferential direction, and a spacing space 232 for the limiting connecting column 211 to pass through is arranged between adjacent extension parts 231.

[0054] It can be understood that the plurality of screw rod transmission mechanisms cooperate with the positioning disc 22 to fix the plurality of nuts 21 on the same horizontal plane, thereby improving the output thrust and motion synchronization, and avoiding vibration or deviation of the piston rod 16 caused by uneven force.

[0055] The spacing space 232 is located between adjacent extension parts 231 of the uniform force shock absorbing plate 23, and is used for the limiting connecting column 211 to pass through, so that the two limiting connecting columns 211 on the nut 21 limit the extension part 231 in the left-right direction, preventing the extension part 231 from moving left and right in the interval to buffer the shock and enhance the shock absorption effect.

[0056] At this time, the function of the uniform force shock absorbing plate 23 is as follows: 1. When the plurality of screw rods 20 rotate, the thrust or tension of the plurality of nuts 21 is transmitted to the piston rod 16 through the parallel connection of the uniform force shock absorbing plate 23, and the uniform force shock absorbing plate 23 can be deformed appropriately during the operation of the electric cylinder, thereby effectively reducing the transmission of vibration and balancing the working force of each screw rod 20. 2. The vibration impact generated by the working load (connected with the piston rod 16) is reduced, and the screw rod 20 is prevented from being damaged.

[0057] In some embodiments, the driving assembly includes a driving wheel 15 and a driving motor, the driving motor drives the driving wheel 15 to rotate, and the screw rod 20 is coaxially fixed with a driven wheel 14, and the driven wheel 14 is engaged with the driving wheel 15.

[0058] When the piston rod 16 is arranged with a plurality of screw rod transmission mechanisms in a circumferential direction, the driving wheel 15 is located at the center position of the plurality of driven wheels 14.

[0059] It can be understood that when the screw rod transmission mechanism is one, it includes one driving wheel 15 and one driven wheel 14. When the screw rod transmission mechanism is multiple, it includes one driving wheel 15 and multiple driven wheels 14, and the central driving wheel 15 is engaged with the circumferential multiple driven wheels 14, which ensures the synchronization of the rotation of the plurality of screw rods 20 and avoids vibration caused by driving differences.

[0060] In some embodiments, the screw rod parallel electric cylinder structure further includes an air pipe 30, one end of the air pipe 30 is in communication with the cylinder shell, the other end is connected with an air source treatment unit, and the air pipe 30 is used for balancing the air pressure in the cylinder shell.

[0061] It can be understood that the air source processing unit includes a filter, a pressure reducing valve, etc., and 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 inside of the cylinder shell. Specifically, the air pipe 30 can timely transmit the air pressure change 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 suitable for the inside of 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 supplemented into the cylinder shell through the air pipe 30, so that the stability of the air pressure in the cylinder shell is always maintained. The filter can effectively filter the dust, impurities and moisture in the air, avoid these pollutants from entering the inside of the cylinder shell, prevent the precise components such as the lead screw 20 and the nut 21 from being abraded or corroded, and ensure the service life and operation accuracy of the electric cylinder.

[0062] For example, when applied to a special operation vehicle, the air pipe 30 is led into the cylinder shell, the air pipe 30 leads to the air source in the cab from the cylinder shell, and the filter is connected on the air pipe 30 to filter the dust, impurities and moisture in the air, avoid these pollutants from entering the inside of the cylinder shell, prevent the precise components such as the lead screw 20 and the nut 21 from being abraded or corroded, and ensure the service life and operation accuracy of the electric cylinder.

[0063] In some specific embodiments, the electric cylinder structure with the parallel lead screws further includes a lubricating unit, the lubricating unit includes an oil injection pipe, a return pipe 44 and an oil tank 43; one end of the oil injection pipe is in communication with the oil tank 43, and the other end is in communication with the top of the cylinder shell; one end of the return pipe 44 is in communication with the bottom of the cylinder shell, and the other end is in communication with the oil tank 43; the return pipe 44 is used to transport the oil collected at the bottom of the cylinder shell into the oil tank 43; and the oil tank 43 is provided with an oil pump for transporting oil.

[0064] It can be understood that the lubricating unit can spray oil to the cylinder shell to lubricate the lead screw 20, reduce friction, improve the service life of the lead screw 20, and ensure the smoothness of the operation of the electric cylinder. The return pipe 44 makes the excess lubricating oil return to the oil tank 43, realizes recycling, and saves resources.

[0065] It should be noted that under the action of gravity, the oil entering from the top of the cylinder shell is collected at the bottom of the cylinder shell, and then transported from the bottom of the cylinder shell to the oil tank 43 (located below the bottom of the cylinder shell) through the return pipe 44. When the oil tank 43 is higher than the bottom of the cylinder shell, or the cylinder shell is not placed in the vertical direction, the oil cannot flow from the top of the cylinder shell to the bottom of the cylinder shell under the action of gravity. An oil pump can be provided on the return pipe 44 to transport the oil collected at the bottom of the cylinder shell into the oil tank 43.

[0066] In some embodiments, the oil injection pipe comprises an oil injection main pipe 41 and an annular oil injection pipe 42; one end of the oil injection main pipe 41 is communicated with an oil tank 43, and the other end is communicated with the annular oil injection pipe 42; the annular oil injection pipe 42 is fixed on the outer wall of the cylinder shell, and the annular oil injection pipe 42 is provided with injection ports or nozzles in the circumferential direction; the cylinder shell is provided with through holes in the circumferential direction, which are matched with the injection ports or nozzles; the injection ports are communicated with the through holes; and the annular oil injection pipe 42 is used for spraying oil into the cylinder shell in the circumferential direction.

[0067] It can be understood that the annular oil injection pipe 42 can spray oil into the lead screw 20 in the circumferential direction, uniformly lubricate the lead screw 20, and improve the lubrication effect.

[0068] In some embodiments, the two ends of the lead screw 20 are respectively rotationally connected with the first bearing 17 and the second bearing 18, and the first bearing 17 and the second bearing 18 are respectively fixed on the two ends of the cylinder shell.

[0069] It can be understood that the first bearing 17 and the second bearing 18 are used to ensure the stable rotation of the lead screw 20. Specifically, the cylinder shell comprises 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 two ends of the lead screw 20 are respectively rotationally connected with the first bearing 17 fixed on the front end cover 12 and the second bearing 18 fixed on the rear end cover 13. The first bearing 17 and the second bearing 18 are respectively arranged at the two ends of the lead screw 20, which reduces the friction resistance when the lead screw 20 rotates, and ensures the stable high-speed rotation of the lead screw 20.

[0070] Working principle: the driving motor drives the driving wheel 15 to rotate, which drives the lead screw 20 to rotate synchronously through the meshing with the driven wheels 14; the nut 21 moves linearly on the lead screw 20; the extension part 231 of the uniform force damping plate 23 is pushed by the clamping plate 24 and the supporting boss 25, thereby driving the piston rod 16 to move reciprocally. In the movement process, the elastic self-recovery ability of the uniform force damping plate 23 can absorb and buffer the vibration of the piston rod 16. The lubrication unit provides good lubrication for the lead screw 20 and the nut 21, reducing friction and vibration; the air pipe 30 balances the air pressure in the cylinder shell, ensuring stable movement.

[0071] When a plurality of lead screw transmission mechanisms are arranged on the piston rod 16 in the circumferential direction, the positioning disc 22 ensures the synchronous movement of the plurality of nuts 21, avoiding the deflection of the piston rod 16; the central driving wheel 15 and the plurality of driven wheels 14 in the circumferential direction ensure the synchronism of the rotation of the plurality of lead screws 20, avoiding vibration caused by driving difference.

[0072] It is to be understood that the present application is not limited to the details of the above-exemplified embodiments and can be implemented in various other forms without departing from the spirit or essential characteristics of the application. Consequently, any exemplary embodiment is to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein and are meant to be covered by the following claims.

Claims

1. A structure of a screw-parallel electric cylinder, characterized by comprising: The device comprises a cylinder shell, a piston rod and a screw drive mechanism, the screw drive mechanism comprises a screw, a nut and a driving assembly; the driving assembly drives the screw to rotate in the cylinder shell, and drives the nut to move linearly along the screw axis; The piston rod is arranged in parallel with the screw, and reciprocates in the cylinder shell; the piston rod is fixed with a uniform force shock absorbing plate with elastic self-recovery ability; the uniform force shock absorbing plate is provided with an extension part extending outward; The nut is fixed with a clamping plate, and the clamping plate is spaced apart from the nut; the extension part is arranged in the space.

2. The structure of the screw-parallel electric cylinder according to claim 1, wherein, Both ends of the nut are fixed with a limiting connecting column, and the vertical height of the limiting connecting column is greater than the vertical height of the nut; both ends of the clamping plate are connected with the limiting connecting column; the surface of the clamping plate facing the extension part and the surface of the nut facing the extension part are both fixed with a supporting boss, and the supporting boss is in contact with the extension part.

3. The structure of the screw-parallel electric cylinder according to claim 1, wherein, The extension part is U-shaped, and the U-shaped opening of the extension part is used to pass through the screw; the inner circumferential wall of the U-shaped opening is spaced apart from the screw.

4. The structure of the screw-parallel electric cylinder according to claim 1, wherein, The piston rod is fixed with an annular boss, and the uniform force shock absorbing plate is provided with a first through hole; the outer diameter of the annular boss is greater than the inner diameter of the first through hole; the uniform force shock absorbing plate is fixed on the annular boss by bolts.

5. The structure of the screw-parallel electric cylinder according to claim 2, wherein, A plurality of screw drive mechanisms are arranged circumferentially on the piston rod, and the plurality of nuts of the plurality of screw drive mechanisms are fixed on a positioning disc; the positioning disc is provided with a second through hole for the piston rod to pass through, and is provided with a third through hole for the screw to pass through; The uniform force shock absorbing plate is circumferentially spaced apart with the extension parts, and the limiting connecting column passes through the avoidance space between adjacent extension parts.

6. The structure of the screw-parallel electric cylinder according to claim 5, wherein, The driving assembly comprises a driving motor and a driving wheel; the driving motor drives the driving wheel to rotate; the screw is coaxially fixed with a driven wheel; the driven wheel is engaged with the driving wheel; When a plurality of screw drive mechanisms are arranged circumferentially on the piston rod, the driving wheel is located at the center position of the plurality of driven wheels.

7. The structure of the screw-parallel electric cylinder according to claim 1, wherein, A gas pipe is further arranged, one end of the gas pipe is communicated with the cylinder shell, and the other end is connected with a gas source processing unit; the gas pipe is used to balance the air pressure in the cylinder shell.

8. The structure of the screw-parallel electric cylinder according to claim 1, wherein, A lubricating unit is further arranged, the lubricating unit comprises an oil injection pipe, a return pipe and an oil tank; one end of the oil injection pipe is communicated with the oil tank, and the other end is communicated with the top of the cylinder shell; one end of the return pipe is communicated with the bottom of the cylinder shell, and the other end is communicated with the oil tank; the return pipe is used to transport the oil collected at the bottom of the cylinder shell into the oil tank; the oil tank is provided with an oil pump for transporting oil.

9. The structure of the screw-parallel electric cylinder according to claim 8, wherein, The oil injection pipe comprises an oil injection main pipe and an annular oil injection pipe; one end of the oil injection main pipe is communicated with the oil tank, and the other end is communicated with the annular oil injection pipe; the annular oil injection pipe is fixed on the outer wall of the cylinder shell; the annular oil injection pipe is circumferentially spaced apart with injection ports or nozzles; the cylinder shell is circumferentially provided with through holes matched with the injection ports or nozzles; the injection ports are communicated with the through holes; the annular oil injection pipe is used to spray oil circumferentially into the cylinder shell.

10. The structure of the screw-parallel electric cylinder according to claim 1, wherein, Two ends of the lead screw are respectively rotationally connected with a first bearing and a second bearing, and the first bearing and the second bearing are respectively fixed at two ends of the cylinder shell.

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