Heavy multi-section telescopic electric cylinder

Abstract

The heavy multi-section telescopic electric cylinder comprises a lead screw set arranged in a cylinder barrel set, the lower end of the cylinder barrel set is connected with a motor transmission assembly, and a servo motor is arranged on one side of the cylinder barrel set. The lead screw set comprises a first lead screw, a second lead screw axially penetrates through the first lead screw, the upper end of the first lead screw is connected with a lead screw transmission assembly, and the upper end of the second lead screw is connected with an idling connecting assembly. The whole structural design of the utility model has the advantages of good rigidity, good stability, strong anti-shearing force, large bearing force, high transmission efficiency, high transmission precision, fast stretching speed, long stretching stroke, strong universality and good verticality of the whole equipment; the multi-section electric cylinder effectively solves the problems that a multi-section electric cylinder in the current market mainly adopts a trapezoidal layout design of a plurality of lead screws, and a sliding telescopic structure of a cylinder barrel is only arranged in one end of the electric cylinder, so that the multi-section electric cylinder has the characteristics of complex structure, low transmission efficiency, poor rigidity, poor shearing resistance, poor stability, poor perpendicularity, small bearing capacity, low cost and the like. The extending stroke is short; and the universality is poor.

Description

Technical Field

[0001] The utility model relates to the field of electric cylinders, in particular to a heavy multi-stage telescopic electric cylinder. Background Art

[0002] Most traditional electric cylinders adopt a columnar structure design. When a multi-stage lifting structure design is adopted for ordinary electric cylinders, the multi-stage lifting electric cylinder is driven by a motor to move the lead screw. The lead screw rotates at the original position, and the top force generated by the rotation of the lead screw thread drives the nut sleeve to move up and down to realize the telescopic movement of the sleeve. At present, the multi-stage electric cylinders on the market mainly adopt a trapezoidal layout of multiple lead screws and require multiple motors to drive and operate. For example, in the Chinese invention patent with the publication number of "CN111503233A" and the patent name of "Multi-motor synchronous drive high-power four-stage telescopic electric cylinder", the multi-stage telescopic electric cylinder with such a structure has the disadvantages of complex structure, high production cost and low transmission efficiency. At the same time, the sliding telescopic structure of the cylinder barrel of the multi-stage electric cylinders on the market at present is only arranged inside one end of the electric cylinder. For example, in the Chinese utility model patent with the publication number of "CN216009439U" and the patent name of "A multi-stage telescopic cylinder", the electric cylinder with such a structure has the disadvantages of poor rigidity, poor shear resistance, poor stability, small bearing capacity, and poor perpendicularity and force-bearing of the whole device, resulting in low transmission efficiency and slow telescopic speed of the electric cylinder, which affects the production efficiency. At the same time, its transmission accuracy cannot be effectively guaranteed, increasing the production cost. In addition, the electric cylinder also has the problem of short extension stroke. To meet the demand for a large extension stroke, manufacturers often adopt a structure design of an ultra-long cylinder barrel. However, the structure design of the ultra-long cylinder barrel will make the electric cylinder too long, and its application is limited in a narrow space environment, resulting in poor versatility. Summary of the Invention

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a heavy multi-stage telescopic electric cylinder.

[0004] To solve the above technical problems, the utility model adopts the following technical solutions: The heavy multi-stage telescopic electric cylinder includes a cylinder barrel group, a lead screw group is arranged inside the cylinder barrel group, a motor transmission assembly is connected to the lower end of the cylinder barrel group, and a servo motor is arranged on one side of the cylinder barrel group. The servo motor is drivingly connected to the motor transmission assembly.

[0005] By adopting the above technical solutions, the servo motor, the motor transmission assembly and the lead screw group cooperate to drive the cylinder barrel group to perform multi-stage telescopic movement synchronously, so that it has the advantage of fast telescopic speed.

[0006] Preferably, the lead screw group includes a first lead screw, a second lead screw is axially penetrated through the first lead screw, a lead screw transmission assembly is connected to the upper end of the first lead screw, and an idle connection assembly is connected to the upper end of the second lead screw.

[0007] Preferably, a channel for the second lead screw to pass through is provided along the axial direction at the center of the first lead screw. A slider is provided at the lower end of the second lead screw. The transverse section of the slider is elliptical. The inner wall of the first lead screw is adapted to the external shape of the slider. The threads of the first lead screw and the second lead screw are arranged in opposite directions.

[0008] By adopting the above technical solution, by setting the transverse section of the slider to be elliptical and the inner wall of the first lead screw to be adapted to the external shape of the slider, the first lead screw can drive the slider to slide back and forth on its inner wall. The first lead screw can drive the second lead screw to rotate in the same direction through the slider.

[0009] Preferably, the cylinder block group includes a first cylinder block. Along the axial direction, first keyways are provided on the inner wall of the first cylinder block. A first cylinder head is provided at the upper end of the first cylinder block. A second cylinder block is provided inside the first cylinder block, and the second cylinder block movably passes through the first cylinder head. Along the axial direction, second keyways are provided on the inner wall of the second cylinder block. A second cylinder head is provided at the upper end of the second cylinder block. A first sliding part is provided at the lower end of the second cylinder block. Along the axial direction, a first groove is provided on the outer surface of the first sliding part. The first keyways and the first groove are fitted and installed. The first keyways prevent the second cylinder block from rotating. A first nut is axially penetrated through the first sliding part, and the first nut is threadedly connected to the first lead screw. A third cylinder block is provided inside the second cylinder block, and the third cylinder block movably passes through the second cylinder head. Along the axial direction, third keyways are provided on the inner wall of the third cylinder block. A third cylinder head is provided at the upper end of the third cylinder block. A second sliding part is provided at the lower end of the third cylinder block. Along the axial direction, a second groove is provided on the outer surface of the second sliding part. The second keyways and the second groove are fitted and installed. The second keyways prevent the third cylinder block from rotating. The servo motor drives the second cylinder block to telescopically slide in the first cylinder block through the motor transmission component and the lead screw group. The lead screw group drives the third cylinder block to telescopically slide in the second cylinder block through the idle connection component. It can realize driving the second cylinder block and the third cylinder block to synchronously perform telescopic movements respectively from both ends of the electric cylinder, so as to ensure the consistency of the overall perpendicularity and ensure the uniform force of the whole, and improve the overall rigidity, stability, shear resistance, bearing capacity and transmission accuracy of the electric cylinder. It solves the problem that the sliding and telescopic structure of the cylinder block of the multi-stage electric cylinder on the market is only arranged inside one end of the electric cylinder, resulting in poor rigidity, poor shear resistance, poor stability, small bearing capacity, low transmission efficiency, low transmission accuracy, and poor perpendicularity and force of the whole equipment.

[0010] By adopting the above technical solution, the servo motor drives the first lead screw to rotate through the motor transmission assembly. The first nut rises on the first lead screw. The rising first nut drives the second cylinder to rise synchronously through the first sliding part provided at the lower end of the second cylinder, so that the second cylinder makes an extending movement in the first cylinder. Conversely, when the servo motor drives the first lead screw to rotate in the reverse direction through the motor transmission assembly, the first nut resets and descends on the first lead screw. The descending first nut drives the second cylinder to reset and descend synchronously through the first sliding part provided at the lower end of the second cylinder, so that the second cylinder makes a reset retracting movement in the first cylinder.

[0011] Preferably, the motor transmission assembly includes a transmission box. A first bearing seat is provided at one end of the transmission box. The first bearing seat is connected and installed with the first cylinder. A first bearing is provided in the first bearing seat. A coupling is rotatably connected in the first bearing. The coupling is connected and installed with the lower end of the first lead screw. A first synchronous pulley is provided below the coupling. A speed reducer is provided at the other end of the transmission box. The speed reducer is drivingly connected with the servo motor. A second synchronous pulley is provided below the speed reducer. The first synchronous pulley is drivingly connected with the second synchronous pulley through a synchronous belt.

[0012] By adopting the above technical solution, since the first lead screw is fixedly connected with the coupling, the coupling rotates freely in the first bearing, the servo motor can drive the second synchronous pulley to rotate forward and backward through the speed reducer, the second synchronous pulley can drive the first synchronous pulley to rotate synchronously forward and backward through the synchronous belt, the first synchronous pulley drives the coupling to rotate forward and backward in the first bearing, the coupling drives the first lead screw to rotate forward and backward, and the first lead screw that rotates forward and backward can drive other components connected and installed with it to make telescopic or lifting movements.

[0013] Preferably, the lead screw transmission assembly includes a piston provided in the third cylinder. A third groove is provided on the outer surface of the piston along the axial direction. A third key strip is fitted and installed in the third groove. The third key strip prevents the piston from rotating. A second nut axially penetrates the piston. The second nut is threadedly connected with the second lead screw. A second bearing seat is provided below the piston. A second bearing is provided in the second bearing seat. The second bearing is rotatably connected with the upper end of the first lead screw. The second bearing holds the upper end of the first lead screw. The first lead screw rotates freely in the second bearing.

[0014] By adopting the above technical solution, since the piston is fixedly installed with the second bearing seat, and the piston is also fixedly installed with the second nut axially penetrating it, when the first lead screw drives the second lead screw to rotate in the same direction through the slider, the first lead screw can rotate freely in the second bearing. By setting the threads of the first lead screw and the second lead screw in the reverse direction, when the second lead screw rotates and rises in the second nut, the second lead screw can make an extending movement in the first lead screw.

[0015] Preferably, the idling connection assembly includes a third bearing seat installed under the third cylinder head. A third bearing is provided in the third bearing seat. The third bearing is rotatably connected to the upper end of the second lead screw, and the third bearing holds the upper end of the second lead screw, and the second lead screw rotates freely within the third bearing.

[0016] By adopting the above technical solution, since the third cylinder head is fixedly installed with the third bearing seat, and the third cylinder head is fixedly installed with the third cylinder barrel, and the second lead screw rotates freely within the third bearing, when the second lead screw moves upward or extends, it can drive the third bearing, the third bearing seat and the third cylinder head to rise synchronously. The raised third cylinder head drives the third cylinder barrel to rise synchronously, enabling the raised third cylinder barrel to extend within the second cylinder barrel.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0018] 1. By designing the structure of the cylinder barrel group, a first sliding portion is provided at the lower end of the second cylinder barrel in the cylinder barrel group, and a first nut is axially penetrated through the first sliding portion. The first nut is threadedly connected to the first lead screw. When the servo motor drives the first lead screw to rotate through the motor drive assembly, the first nut can rise on the first lead screw. The raised first nut drives the second cylinder barrel to rise synchronously through the first sliding portion, enabling the second cylinder barrel to extend within the first cylinder barrel; conversely, when the servo motor drives the first lead screw to rotate in the reverse direction through the motor drive assembly, the first nut can lower on the first lead screw. The lowered first nut drives the second cylinder barrel to lower synchronously through the first sliding portion, enabling the second cylinder barrel to retract within the first cylinder barrel.

[0019] 2. By designing the structure of the lead screw group, a slider is provided at the lower end of the second lead screw in the lead screw group. The transverse section of the slider is set to be elliptical and the inner wall of the first lead screw is set to be adapted to the external shape of the slider, so that the slider can slide back and forth in the first lead screw. When the first lead screw rotates, the second lead screw can be driven to rotate in the same direction through the slider, and the first lead screw rotates freely in the second bearing. The threads of the first lead screw and the second lead screw are set in the reverse direction. When the second lead screw rotates in the second nut and moves upward, the second lead screw can move out in the first lead screw. It also connects a lead screw transmission component to the upper end of the first lead screw and designs the structure of the lead screw transmission component. A third cylinder head is fixedly installed at the upper end of the third cylinder barrel, and a third bearing seat is fixedly installed under the third cylinder head. The second lead screw rotates freely in the third bearing in the third bearing seat. When the second lead screw rises, it can drive the third bearing, the third bearing seat and the third cylinder head to rise synchronously. The rise of the third cylinder head drives the third cylinder barrel fixedly installed with it to rise synchronously. When the third cylinder barrel rises, it can move out in the second cylinder barrel. And when the second cylinder barrel moves out in the first cylinder barrel, the third cylinder barrel can move out synchronously in the second cylinder barrel, so that it can greatly improve the overall extension speed of the electric cylinder and make its extension speed the fastest. It has the advantage of high transmission efficiency. In addition, the third cylinder barrel realizes a double-stroke extension relative to the first cylinder barrel, and it greatly improves the extension stroke of the electric cylinder to solve the problems of slow extension speed and short extension stroke of multi-stage electric cylinders on the market currently.

[0020] 3. By providing a first sliding part at the lower end of the second cylinder barrel and a piston in the third cylinder barrel, a second bearing seat is provided under the piston, a second bearing is provided in the second bearing seat, and the second bearing is rotationally connected to the upper end of the first lead screw. The second bearing holds the upper end of the first lead screw, and the first lead screw rotates freely in the second bearing. When the first sliding part of the second cylinder barrel makes a piston expansion and contraction movement in the first cylinder barrel, the piston can be driven to make a piston expansion and contraction movement synchronously in the third cylinder barrel through the lead screw transmission component. It ensures that the electric cylinder will not shake during the expansion and contraction movement, so as to ensure high precision of the linear movement of the electric cylinder. It further improves the stability of the electric cylinder, makes the electric cylinder stronger in rigidity, shear resistance and bearing capacity. And it adopts a multi-stage expansion and contraction structure design, so that it has the advantages of small volume but long extension stroke, and is suitable for application and installation in narrow space environments to achieve the purpose of strong versatility, and it improves the efficiency of industrial production.

[0021] 4. The overall structural design enables the second cylinder barrel to perform telescopic or lifting movements within the first cylinder barrel, while the third cylinder barrel can synchronously perform telescopic or lifting movements within the second cylinder barrel, enabling it to greatly improve the telescopic or lifting speed of the overall electric cylinder and ensure that its telescopic or lifting speed is maximized. It has the advantage of high transmission efficiency. In addition, it also enables driving the second cylinder barrel and the third cylinder barrel to synchronously perform telescopic movements from both ends of the electric cylinder, so as to ensure the consistency of the overall verticality and the even distribution of the overall force, and improve the rigidity, stability, shear resistance, load-bearing capacity and transmission accuracy of the overall electric cylinder, effectively solving the problems of the multi-stage electric cylinders currently on the market, mainly including the trapezoidal layout design of multiple lead screws and the sliding telescopic structure of the cylinder barrel only arranged within one end of the electric cylinder, resulting in complex structure, low transmission efficiency, poor rigidity, poor shear resistance, poor stability, poor verticality, small load-bearing capacity, short extension stroke and poor versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] For ease of explanation, the present utility model will be described in detail by the following preferred embodiments and the accompanying drawings.

[0023] Figure 1 Stereogram of the heavy multi-stage telescopic electric cylinder of the present utility model.

[0024] Figure 2 Longitudinal sectional view of the heavy multi-stage telescopic electric cylinder of the present utility model.

[0025] Figure 3 Longitudinal sectional view of the heavy multi-stage telescopic electric cylinder of the present utility model without the idling connection assembly and the third cylinder head.

[0026] Figure 4 Longitudinal sectional view of the heavy multi-stage telescopic electric cylinder of the present utility model without the first cylinder barrel and the second cylinder barrel.

[0027] Figure 5 Transverse sectional view of the cylinder barrel group of the heavy multi-stage telescopic electric cylinder of the present utility model.

[0028] Figure 6 Transverse sectional view of the third cylinder barrel and the piston of the heavy multi-stage telescopic electric cylinder of the present utility model.

[0029] Figure 7 Transverse sectional view of the first lead screw and the slider of the heavy multi-stage telescopic electric cylinder of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] To facilitate the understanding of the present utility model, the present utility model will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present utility model are shown in the drawings. However, the present utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present utility model more thorough and comprehensive.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs. The terms used in the specification of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model.

[0032] In this embodiment, with reference to Figures 1 to 7 As shown, the heavy multi-section telescopic electric cylinder of the present utility model includes a cylinder barrel group 1, a lead screw group 2 is arranged inside the cylinder barrel group 1, a motor drive assembly 3 is connected to the lower end of the cylinder barrel group 1, a servo motor 4 is arranged on one side of the cylinder barrel group 1, and the servo motor 4 is drivingly connected to the motor drive assembly 3.

[0033] In one embodiment, the lead screw group 2 includes a first lead screw 21, a second lead screw 22 is axially penetrated through the first lead screw 21, a lead screw drive assembly 5 is connected to the upper end of the first lead screw 21, and an idle connection assembly 6 is connected to the upper end of the second lead screw 22.

[0034] In one embodiment, a channel 23 for the second lead screw 22 to penetrate through is axially provided along the center of the first lead screw 21. A slider 24 is arranged at the lower end of the second lead screw 22. The transverse section of the slider 24 is elliptical. The inner wall of the first lead screw 21 is adapted to the outer shape of the slider 24. The threads of the first lead screw 21 and the second lead screw 22 are arranged in the opposite direction.

[0035] In one embodiment, the cylinder barrel group 1 includes a first cylinder barrel 11. A first key strip 110 is axially arranged on the inner wall of the first cylinder barrel 11. A first cylinder head 111 is arranged at the upper end of the first cylinder barrel 11. A second cylinder barrel 12 is arranged inside the first cylinder barrel 11, and the second cylinder barrel 12 movably penetrates through the first cylinder head 111.

[0036] In one embodiment, a second key strip 120 is axially arranged on the inner wall of the second cylinder barrel 12. A second cylinder head 121 is arranged at the upper end of the second cylinder barrel 12. A first sliding part 14 is arranged at the lower end of the second cylinder barrel 12. A first groove 15 is axially arranged on the outer surface of the first sliding part 14. The first key strip 110 is adaptively installed with the first groove 15. The first key strip 110 stops the rotation of the second cylinder barrel 12. A first nut 16 is axially penetrated through the first sliding part 14. The first nut 16 is threadedly connected to the first lead screw 21. A third cylinder barrel 13 is arranged inside the second cylinder barrel 12, and the third cylinder barrel 13 movably penetrates through the second cylinder head 121.

[0037] In one embodiment, a third keyway 130 is provided on the inner wall of the third cylinder barrel 13 in the axial direction. A third cylinder head 131 is provided at the upper end of the third cylinder barrel 13, and a second sliding part 17 is provided at the lower end of the third cylinder barrel 13. A second groove 18 is provided on the outer surface of the second sliding part 17 in the axial direction. The second keyway 120 is fitted and installed in the second groove 18. The second keyway 120 prevents the third cylinder barrel 13 from rotating. The second cylinder barrel 12 slides telescopically in the first cylinder barrel 11, and the third cylinder barrel 13 slides telescopically in the second cylinder barrel 12.

[0038] In one embodiment, the motor transmission assembly 3 includes a transmission box 30. A first bearing seat 31 is provided at one end of the transmission box 30. The first bearing seat 31 is connected and installed with the first cylinder barrel 11. A first bearing 32 is provided in the first bearing seat 31. A coupling 33 is rotatably connected in the first bearing 32. The coupling 33 is connected and installed with the lower end of the first lead screw 21. A first synchronous pulley 34 is provided below the coupling 33. A speed reducer 35 is provided at the other end of the transmission box 30. The speed reducer 35 is drivingly connected with the servo motor 4. A second synchronous pulley 36 is provided below the speed reducer 35. The first synchronous pulley 34 is drivingly connected with the second synchronous pulley 36 through a synchronous belt 37.

[0039] In one embodiment, the lead screw transmission assembly 5 includes a piston 51 provided in the third cylinder barrel 13. A third groove 52 is provided on the outer surface of the piston 51 in the axial direction. The third keyway 130 is fitted and installed in the third groove 52. The third keyway 130 prevents the piston 51 from rotating. A second nut 53 axially penetrates the piston 51. The second nut 53 is threadedly connected with the second lead screw 22. A second bearing seat 54 is provided below the piston 51. A second bearing 55 is provided in the second bearing seat 54. The second bearing 55 is rotatably connected with the upper end of the first lead screw 21. The second bearing 55 clamps the upper end of the first lead screw 21. The first lead screw 21 freely rotates in the second bearing 55.

[0040] In one embodiment, the idle connection assembly 6 includes a third bearing seat 61 installed below the third cylinder head 131. A third bearing 62 is provided in the third bearing seat 61. The third bearing 62 is rotatably connected with the upper end of the second lead screw 22. The third bearing 62 clamps the upper end of the second lead screw 22. The second lead screw 22 freely rotates in the third bearing 62.

[0041] In another embodiment, the present utility model further provides a control principle for a heavy multi-section telescopic electric cylinder: the servo motor 4 can drive the motor transmission assembly 3 to rotate forward and backward through the speed reducer 35. By connecting and installing the coupling 33 in the motor transmission assembly 3 to the lower end of the first lead screw 21 in the lead screw group 2, the coupling 33 can rotate freely within the first bearing 32. The forward and backward rotating motor transmission assembly 3 can drive the first lead screw 21 in the lead screw group 2 to rotate synchronously forward and backward through the coupling 33. And by providing a first sliding part 14 at the lower end of the second cylinder 12 in the cylinder group 1, and axially penetrating the first sliding part 14 with a first nut 16, the first nut 16 is threadedly connected to the first lead screw 21; when the first lead screw 21 rotates under the drive of the servo motor 4 and drives the first nut 16 to move upward on the first lead screw 21, the first nut 16 drives the second cylinder 12 to rise through the first sliding part 14 to realize the extension movement of the second cylinder 12 within the first cylinder 11. Conversely, when the first lead screw 21 rotates reversely under the drive of the servo motor 4, it can drive the first nut 16 to move downward on the first lead screw 21, and the first nut 16 drives the second cylinder 12 to reset and descend through the first sliding part 14 to realize the retraction movement or contraction movement of the second cylinder 12 within the first cylinder 11.

[0042] Since a second lead screw 22 is axially penetrated through the first lead screw 21, by providing a slider 24 at the lower end of the second lead screw 22 and setting the transverse section of the slider 24 to be elliptical, and setting the inner wall of the first lead screw 21 to be adapted to the outer shape of the slider 24, the slider 24 can slide back and forth within the first lead screw 21, and the first lead screw 21 can drive the second lead screw 22 to rotate in the same direction through the slider 24. And by providing a piston 51 within the third cylinder 13, axially penetrating the piston 51 with a second nut 53, the second nut 53 in the lead screw transmission assembly 5 is threadedly connected to the second lead screw 22, a second bearing seat 54 is provided below the piston 51, a second bearing 55 is provided within the second bearing seat 54, and the second bearing 55 is rotatably connected to the upper end of the first lead screw 21, and the second bearing 55 clamps the upper end of the first lead screw 21, enabling the first lead screw 21 to rotate freely within the second bearing 55 to ensure the perpendicularity and good force distribution of the first lead screw 21; and the threads of the first lead screw 21 and the second lead screw 22 are set in the reverse direction. When the second lead screw 22 rotates within the second nut 53 under the drive of the first lead screw 21 and makes an extension movement or an upward movement, the second lead screw 22 can realize an extension movement or an upward movement within the first lead screw 21. Conversely, when the second lead screw 22 rotates reversely within the second nut 53 under the drive of the first lead screw 21 and makes a downward movement, the second lead screw 22 can make a retraction movement or a downward movement within the first lead screw 21.

[0043] It is provided with a third cylinder 13 inside the second cylinder 12. A third cylinder head 131 is fixedly installed at the upper end of the third cylinder 13. The third cylinder head 131 is fixedly installed with the third bearing seat 61. A third bearing 62 is provided inside the third bearing seat 61. The third bearing 62 is rotatably connected to the upper end of the second lead screw 22. The third bearing 62 clamps the upper end of the second lead screw 22, enabling the second lead screw 22 to freely rotate inside the third bearing 62. When the second lead screw 22 makes an extending movement or a rising movement, it can drive the third bearing 62, the third bearing seat 61, and the third cylinder head 131 to extend or rise synchronously. The extension or rise of the third cylinder head 131 can drive the third cylinder 13 to extend or rise synchronously, enabling the third cylinder 13 to make an extending movement or a rising movement inside the second cylinder 12.

[0044] When the second lead screw 22 makes an extending movement or a rising movement inside the first lead screw 21, the first lead screw 21 is relatively stationary along the axial direction relative to the first cylinder 11. While the first lead screw 21 drives the second cylinder 12 to make an extending movement or a rising movement inside the first cylinder 11 through the first nut 16, the third cylinder 13 can simultaneously make an extending movement or a rising movement inside the second cylinder 12. This enables the third cylinder 13 to achieve a double-stroke extension or rise relative to the first cylinder 11, greatly increasing the stroke of the electric cylinder and thus solving the problem of the short extension stroke of multi-stage electric cylinders on the market currently.

[0045] When the first sliding part 14 of the second cylinder 12 makes a piston 51 expansion and contraction movement or a lifting and sliding movement inside the first cylinder 11, the piston 51 makes a piston 51 expansion and contraction movement or a lifting and sliding movement inside the third cylinder 13, ensuring that the electric cylinder does not wobble during the expansion and contraction movement or the lifting and sliding movement, thus ensuring that the electric cylinder can achieve high-precision linear motion. In addition, by providing an idling connection component 6 at the other end connected to the servo motor 4 and fixedly installing the third cylinder head 131 and the third bearing seat 61 to drive the third cylinder 13 to make an expansion and contraction movement or a lifting and sliding movement inside the second cylinder 12, it improves the perpendicularity and force-bearing capacity of the double-end drive multi-stage cylinder to make an expansion and contraction movement or a lifting and sliding movement. It has the advantages of higher transmission precision, better stability, better rigidity, stronger shear resistance, and greater load-bearing capacity, solving the problems of low transmission precision, poor stability, poor rigidity, weak shear resistance, small load-bearing capacity, and low perpendicularity of the sliding and telescoping structure of the cylinder of multi-stage electric cylinders on the market currently, where the structure is only arranged inside one end of the electric cylinder.

[0046] The overall structural design not only enables the second cylinder 12 to perform telescopic or lifting movements within the first cylinder 11, but also enables the third cylinder 13 to perform synchronous telescopic or lifting movements within the second cylinder 12. This allows it to greatly increase the telescopic or lifting speed of the overall electric cylinder and ensure that its telescopic or lifting speed is maximized. It has the advantage of high transmission efficiency and solves the problem of slow telescopic speed of multi-stage electric cylinders on the market. Moreover, its multi-stage telescopic structure and multi-stage synchronous telescopic operation mode enable it to achieve a long extension stroke, simple structure, strong versatility, and suitability for environmental applications and installations in narrow spaces without using an ultra-long cylinder body structure. It also has the advantage of a small volume, thus solving the problems of long length, poor versatility, and limited application in narrow spaces of electric cylinders with large stroke lengths that require an ultra-long cylinder body structure design on the market. In addition, it can control multiple cylinders to perform multi-stage telescopic or multi-stage lifting synchronously with only one power source (servo motor), reducing the power source and enabling it to reduce production costs.

[0047] The above embodiments are only examples of the present invention and are not used to limit the implementation and scope of rights of the present invention. Any technical solutions that are the same as or equivalent to the content described in the claims of the present invention shall be included within the protection scope of the present invention.

Claims

1. Heavy-duty multi-section telescopic electric cylinder, characterized by: It includes a cylinder group, a screw rod group is arranged in the cylinder group, a motor transmission assembly is connected to the lower end of the cylinder group, a servo motor is arranged on one side of the cylinder group, and the servo motor is drivingly connected to the motor transmission assembly; The screw rod group comprises a first screw rod, a second screw rod is axially penetrated through the first screw rod, a screw rod transmission assembly is connected to the upper end of the first screw rod, and an idle connection assembly is connected to the upper end of the second screw rod.

2. The heavy-duty multi-section telescopic electric cylinder according to claim 1 is characterized in that: A channel for the second screw rod to pass through is provided in the axial direction at the center of the first screw rod, and a slider is provided at the lower end of the second screw rod. The transverse section of the slider is elliptical, the inner wall of the first screw rod is adapted to the outer shape of the slider, and the thread of the first screw rod is set in the opposite direction to the thread of the second screw rod.

3. The heavy-duty multi-section telescopic electric cylinder according to claim 2 is characterized in that: The cylinder group comprises a first cylinder, the inner wall of the first cylinder is provided with a first key strip along the axial direction, the upper end of the first cylinder is provided with a first cylinder cover, the first cylinder is provided with a second cylinder inside the first cylinder, and the second cylinder movably penetrates the first cylinder cover; The inner wall of the second cylinder is provided with a second key strip along the axial direction, the upper end of the second cylinder is provided with a second cylinder cover, the lower end of the second cylinder is provided with a first sliding portion, the outer surface of the first sliding portion is provided with a first groove along the axial direction, the first key strip is adapted and installed with the first groove, the first key strip stops the second cylinder from rotating, a first nut is provided axially through the first sliding portion, the first nut is threadedly connected with the first screw rod, a third cylinder is provided in the second cylinder, and the third cylinder movably passes through the second cylinder cover; The inner wall of the third cylinder is provided with a third key bar along the axial direction, the upper end of the third cylinder is provided with a third cylinder cover, the lower end of the third cylinder is provided with a second sliding part, the outer surface of the second sliding part is provided with a second groove along the axial direction, the second key bar is adapted and installed with the second groove, the second key bar stops the third cylinder from rotating, the second cylinder telescopes and slides in the first cylinder, and the third cylinder telescopes and slides in the second cylinder.

4. The heavy-duty multi-section telescopic electric cylinder according to claim 3 is characterized in that: The motor transmission assembly includes a transmission box, a first bearing seat is provided on one end of the transmission box, the first bearing seat is connected and installed with the first cylinder, a first bearing is provided in the first bearing seat, a coupling is rotatably connected in the first bearing, the coupling is connected and installed with the lower end of the first screw rod, a first synchronous wheel is provided below the coupling, a reducer is provided on the other end of the transmission box, the reducer is drive-connected to the servo motor, a second synchronous wheel is provided below the reducer, and the first synchronous wheel is transmission-connected to the second synchronous wheel through a synchronous belt.

5. The heavy-duty multi-section telescopic electric cylinder according to claim 3 is characterized in that: The screw transmission assembly includes a piston arranged in a third cylinder, a third groove is arranged on the outer surface of the piston in the axial direction, a third key is fitted and installed in the third groove, and the third key stops the piston from rotating; a second nut is arranged axially through the piston, the second nut is threadedly connected to the second screw, a second bearing seat is arranged under the piston, a second bearing is arranged in the second bearing seat, the second bearing is rotatably connected to the upper end of the first screw, the second bearing clamps the upper end of the first screw, and the first screw rotates freely in the second bearing.

6. The heavy-duty multi-section telescopic electric cylinder according to claim 3 is characterized in that: The idling connection assembly includes a third bearing seat installed under the third cylinder head, a third bearing is arranged in the third bearing seat, the third bearing is rotatably connected to the upper end of the second screw rod, the third bearing clamps the upper end of the second screw rod, and the second screw rod rotates freely in the third bearing.

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