Heavy multi-section telescopic electric cylinder
Through the synchronous telescopic design of servo motor and screw group drive, the complex structure and low efficiency of multi-sector electric cylinders are solved, and efficient and fast telescopic movement and long stroke of cylinder group are achieved, which improves the stability of the electric cylinder and Universality.
Patent Information
- Application Number
- CN202411411377.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-10
- Publication Date
- 2024-12-27
AI Technical Summary
The existing multi-sector electric cylinder has complex structure, high production cost, low transmission efficiency, poor rigidity, insufficient shear resistance, poor stability, low transmission accuracy, poor verticality and stress, resulting in slow expansion and short extension stroke. Limits its application and versatility in narrow spaces.
The servo motor, motor transmission assembly and screw assembly are used to drive the cylinder group, and the sliding block and thread design realize the synchronous expansion and contraction movement of the cylinder group, ensuring the consistency of the overall verticality and the uniformity of the stress, and improving the electric cylinder Rigidity, stability and transmission accuracy, and rapid expansion and long stroke are achieved through multi-section synchronous telescopic structure design.
It improves the expansion and contraction speed, transmission efficiency, rigidity and shear resistance of the electric cylinder, solves the problems of low transmission accuracy and short extension stroke, and is suitable for applications in narrow spaces and reduces production costs.
Smart Images
Figure CN119196265A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of electric cylinders, and in particular to a heavy-duty multi-section telescopic electric cylinder. Background Art
[0002] Most traditional electric cylinders adopt a column-type structural design. When ordinary electric cylinders adopt a multi-section lifting structure design, the multi-section lifting electric cylinder is driven by a motor to move the lead screw. The lead screw rotates in the original position. 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-section electric cylinders on the market are mainly designed with multiple lead screws in a trapezoidal layout and require multiple motors to drive the operation, such as the Chinese invention patent with the announcement number "CN111503233A" and the patent name "Multi-motor synchronous drive high-power four-section telescopic electric cylinder". This type of multi-section telescopic electric cylinder 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-section electric cylinder currently on the market is only arranged in one end of the electric cylinder, such as the Chinese utility model patent with the announcement number "CN216009439U" and the patent name "A multi-section electric telescopic cylinder". The electric cylinder of this structure has the disadvantages of poor rigidity, poor shear resistance, poor stability, small load-bearing capacity, and poor verticality and force of the entire equipment. As a result, the transmission efficiency of the electric cylinder is low, the telescopic speed is slow, which affects the production efficiency, and its transmission accuracy cannot be effectively guaranteed, which increases the production cost, and the electric cylinder also has the problem of short extension stroke. In order to meet the demand for a large extension stroke, manufacturers often adopt the structural design of an extra-long cylinder body, but the structural design of an extra-long cylinder body will make the length of the electric cylinder too long, and its application in a narrow space environment is limited, resulting in its poor versatility. Summary of the invention
[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a heavy-duty multi-section telescopic electric cylinder.
[0004] In order to solve the above technical problems, the present invention adopts the following technical solution: the heavy-duty multi-section telescopic electric cylinder includes a cylinder group, a screw group is provided in the cylinder group, a motor transmission assembly is connected to the lower end of the cylinder group, a servo motor is provided on one side of the cylinder group, and the servo motor is driven and connected to the motor transmission assembly.
[0005] By adopting the above technical solution, the servo motor, the motor transmission assembly and the screw rod group cooperate to drive the cylinder group to perform multi-section telescopic movements synchronously, so that it has the advantage of fast telescopic speed.
[0006] Preferably, the screw rod group includes a first screw rod, a second screw rod is axially penetrated through the first screw rod, the upper end of the first screw rod is connected to a screw rod transmission assembly, and the upper end of the second screw rod is connected to an idle connection assembly.
[0007] Preferably, a channel for the second screw rod to pass through is provided in the axial direction at the center of the first screw rod, 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 and the thread of the second screw rod are arranged in opposite directions.
[0008] By adopting the above-mentioned technical solution, the transverse section of the slider is set to be elliptical, and the inner wall of the first screw rod is adapted to the outer shape of the slider, so that the first screw rod can drive the slider to slide back and forth on its inner wall, and the first screw rod can drive the second screw rod to rotate in the same direction through the slider.
[0009] Preferably, the cylinder group includes a first cylinder, a first key strip is provided on the inner wall of the first cylinder along the axial direction, a first cylinder head is provided on the upper end of the first cylinder, a second cylinder is provided in the first cylinder, and the second cylinder movably passes through the first cylinder head; a second key strip is provided on the inner wall of the second cylinder along the axial direction, a second cylinder head is provided on the upper end of the second cylinder, a first sliding portion is provided at the lower end of the second cylinder, a first groove is provided on the outer surface of the first sliding portion along the axial direction, the first key strip is adapted to be installed with the first groove, the first key strip stops the second cylinder from rotating, a first nut is provided axially passing through the first sliding portion, the first nut is threadedly connected to the first screw rod, a third cylinder is provided in the second cylinder, and the third cylinder movably passes through the second cylinder head; a third key strip is provided on the inner wall of the third cylinder along the axial direction, a third cylinder head is provided on the upper end of the third cylinder, a second sliding portion is provided at the lower end of the third cylinder, and the outer surface of the second sliding portion is provided along the axial direction A second groove is provided in the axial direction, and the second key bar is adapted to be installed in the second groove. The second key bar stops the third cylinder from rotating. The servo motor drives the second cylinder to telescope and slide in the first cylinder through the motor transmission assembly and the screw rod group. The screw rod group drives the third cylinder to telescope and slide in the second cylinder through the idle connection assembly. It can drive the second cylinder and the third cylinder to telescope and slide synchronously from both ends of the electric cylinder to ensure the consistency of its overall verticality and ensure the overall uniform force, and improve the overall rigidity, stability, shear resistance, bearing capacity and transmission accuracy of the electric cylinder. It solves the problem that the sliding telescopic structure of the cylinder of the multi-section electric cylinder on the market is only arranged in 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 verticality and force of the entire equipment.
[0010] By adopting the above technical solution, the servo motor drives the first screw rod to rotate through the motor transmission assembly, the first nut is raised on the first screw rod, and the raised first nut drives the second cylinder to rise synchronously through the first sliding part arranged at the lower end of the second cylinder, so that the second cylinder performs an extension movement in the first cylinder. Conversely, when the servo motor drives the first screw rod to rotate in the opposite direction through the motor transmission assembly, the first nut is reset and lowered on the first screw rod, and the lowered first nut drives the second cylinder to reset and lower synchronously through the first sliding part arranged at the lower end of the second cylinder, so that the second cylinder performs a reset and retract movement in the first cylinder.
[0011] Preferably, 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, and 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.
[0012] By adopting the above technical solution, since the first screw is fixedly connected to the coupling, the coupling rotates freely in the first bearing, the servo motor can drive the second synchronous wheel to rotate forward and reversely through the reducer, the second synchronous wheel can drive the first synchronous wheel to rotate forward and reverse synchronously through the synchronous belt, the first synchronous wheel drives the coupling to rotate forward and reversely in the first bearing, the coupling drives the first screw to rotate forward and reversely, and the first screw that rotates forward and reversely can drive other components connected and installed therewith to perform telescopic movement or lifting movement.
[0013] Preferably, the screw transmission assembly includes a piston arranged in a third cylinder, a third groove is provided on the outer surface of the piston in the axial direction, a third key is adapted and installed in the third groove, the third key stops the piston from rotating, a second nut is provided axially through the piston, the second nut is threadedly connected to the second screw, a second bearing seat is provided under the piston, a second bearing is provided 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.
[0014] By adopting the above-mentioned technical solution, since the piston is fixedly installed on the second bearing seat, and the piston is fixedly installed on the second nut axially passing through it, when the first screw rod drives the second screw rod to rotate in the same direction through the slider, the first screw rod can rotate freely in the second bearing. By setting the thread of the first screw rod and the thread of the second screw rod in opposite directions, when the second screw rod rotates in the second nut and makes an upward movement, the second screw rod can make an extending movement in the first screw rod.
[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 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.
[0016] By adopting the above-mentioned technical scheme, since the third cylinder head and the third bearing seat are fixedly installed, the third cylinder head and the third cylinder barrel are fixedly installed, the second screw rod rotates freely in the third bearing, and when the second screw rod makes an ascending movement or an extending movement, it can drive the third bearing, the third bearing seat and the third cylinder head to rise synchronously, and the elevated third cylinder head drives the third cylinder barrel to rise synchronously, which enables the elevated third cylinder barrel to realize an extending movement in the second cylinder barrel.
[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. The structure of the cylinder group is designed, and a first sliding part is provided at the lower end of the second cylinder in the cylinder group, and a first nut is provided axially through the first sliding part, and the first nut is threadedly connected with the first screw rod. When the servo motor drives the first screw rod to rotate through the motor transmission assembly, the first nut can be raised on the first screw rod, and the raised first nut drives the second cylinder to be raised synchronously through the first sliding part, so that the second cylinder can be extended in the first cylinder; conversely, when the servo motor drives the first screw rod to rotate in the opposite direction through the motor transmission assembly, the first nut can be lowered on the first screw rod, and the lowered first nut drives the second cylinder to be lowered synchronously through the first sliding part, so that the second cylinder can be retracted in the first cylinder.
[0018] 2. The structure of the screw rod group is designed, and a slider is provided at the lower end of the second screw rod in the screw rod group. The transverse section of the slider is set to be elliptical and the inner wall of the first screw rod is set to be compatible with the outer shape of the slider, so that the slider can slide back and forth in the first screw rod. When the first screw rod rotates, the slider can drive the second screw rod to rotate in the same direction, and the first screw rod rotates freely in the second bearing; the thread of the first screw rod is set in the opposite direction to the thread of the second screw rod, so that when the second screw rod rotates in the second nut and moves upward, the second screw rod can extend in the first screw rod; the screw rod transmission assembly is connected to the upper end of the first screw rod and the structure of the screw rod transmission assembly is designed, and a third cylinder head is fixedly installed on the upper end of the third cylinder barrel and a third cylinder head is fixedly installed under the third cylinder head. The bearing seat, the second screw rod rotates freely in the third bearing in the third bearing seat, and when the second screw rod is raised, 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 mounted therewith to rise synchronously. When the third cylinder barrel is raised, it can make an extension movement in the second cylinder barrel, and while the second cylinder barrel makes an extension movement in the first cylinder barrel, the third cylinder barrel can make an extension movement in the second cylinder barrel synchronously, so that it can greatly improve the overall extension speed of the electric cylinder and maximize its extension speed, which has the advantage of high transmission efficiency; in addition, the third cylinder barrel achieves a double extension stroke relative to the first cylinder barrel, which greatly improves the extension stroke of the electric cylinder, so as to solve the problems of slow extension speed and short extension stroke of multi-section electric cylinders currently on the market.
[0019] 3. It is provided with a first sliding part at the lower end of the second cylinder and a piston in the third cylinder, a second bearing seat is provided under the piston, a second bearing is provided in the second bearing seat, the second bearing is rotatably connected to the upper end of the first screw rod, the second bearing clamps the upper end of the first screw rod, and the first screw rod rotates freely in the second bearing. When the first sliding part of the second cylinder makes a piston telescopic movement in the first cylinder, it can drive the piston to synchronously make a piston telescopic movement in the third cylinder through the screw transmission assembly. It prevents the electric cylinder from shaking during the telescopic movement to ensure the high precision of the linear movement of the electric cylinder, further improves the stability of the electric cylinder, makes the electric cylinder more rigid, has stronger shear resistance and stronger load-bearing capacity, and adopts a multi-section telescopic structural design, so that it has the advantages of small size but long extension stroke, and is suitable for application and installation in narrow space environments to achieve its strong versatility, which improves the efficiency of industrial production.
[0020] 4. Its overall structural design enables the third cylinder to perform telescopic or lifting movements in the second cylinder at the same time as the second cylinder performs telescopic or lifting movements in the first cylinder, so that the telescopic speed or lifting speed of the electric cylinder as a whole can be greatly improved and its telescopic or lifting speed can be maximized, and it has the advantage of high transmission efficiency; in addition, it can also drive the second cylinder and the third cylinder to perform telescopic movements synchronously from both ends of the electric cylinder to ensure the consistency of its overall verticality and ensure the overall uniform force, and improve the overall rigidity, stability, shear resistance, load-bearing capacity and transmission accuracy of the electric cylinder, so that it can effectively solve the problems of the multi-section electric cylinders on the market, which are mainly designed with a trapezoidal layout of multiple screw rods and the sliding telescopic structure of the cylinder is only arranged in 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
[0021] For ease of explanation, the present invention is described in detail with reference to the following preferred embodiments and the accompanying drawings.
[0022] Figure 1 It is a stereoscopic diagram of the heavy-duty multi-section telescopic electric cylinder of the present invention.
[0023] Figure 2 It is a longitudinal cross-sectional view of the heavy-duty multi-section telescopic electric cylinder of the present invention.
[0024] Figure 3 It is a longitudinal cross-sectional view of the heavy-duty multi-section telescopic electric cylinder of the present invention without the idling connection assembly and the third cylinder cover.
[0025] Figure 4 It is a longitudinal cross-sectional view of the heavy-duty multi-section telescopic electric cylinder of the present invention without the first cylinder barrel and the second cylinder barrel.
[0026] Figure 5 It is a transverse cross-sectional view of the cylinder group of the heavy-duty multi-section telescopic electric cylinder of the present invention.
[0027] Figure 6 It is a transverse cross-sectional view of the third cylinder barrel and the piston of the heavy-duty multi-section telescopic electric cylinder of the present invention.
[0028] Figure 7 It is a transverse cross-sectional view of the first screw rod and the sliding block of the heavy-duty multi-section telescopic electric cylinder of the present invention. DETAILED DESCRIPTION
[0029] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.
[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.
[0031] In this embodiment, refer to Figures 1 to 7 As shown, the heavy-duty multi-section telescopic electric cylinder of the present invention comprises a cylinder group 1, a screw group 2 is arranged inside the cylinder group 1, a motor transmission assembly 3 is connected to the lower end of the cylinder group 1, a servo motor 4 is arranged on one side of the cylinder group 1, and the servo motor 4 is drivingly connected to the motor transmission assembly 3.
[0032] In one embodiment, the screw rod group 2 includes a first screw rod 21 , a second screw rod 22 is axially passed through the first screw rod 21 , a screw rod transmission assembly 5 is connected to the upper end of the first screw rod 21 , and an idler connection assembly 6 is connected to the upper end of the second screw rod 22 .
[0033] In one of the embodiments, a channel 23 for the second screw rod 22 to pass through is provided at the center of the first screw rod 21 along the axial direction, a slider 24 is provided at the lower end of the second screw rod 22, and the transverse section of the slider 24 is elliptical. The inner wall of the first screw rod 21 is adapted to the outer shape of the slider 24, and the thread of the first screw rod 21 and the thread of the second screw rod 22 are set in opposite directions.
[0034] In one embodiment, the cylinder group 1 includes a first cylinder 11, a first key strip 110 is provided on the inner wall of the first cylinder 11 along the axial direction, a first cylinder cover 111 is provided on the upper end of the first cylinder 11, a second cylinder 12 is provided in the first cylinder 11, and the second cylinder 12 movably passes through the first cylinder cover 111.
[0035] In one of the embodiments, a second key strip 120 is provided on the inner wall of the second cylinder 12 along the axial direction, a second cylinder cover 121 is provided on the upper end of the second cylinder 12, a first sliding portion 14 is provided on the lower end of the second cylinder 12, a first groove 15 is provided on the outer surface of the first sliding portion 14 along the axial direction, a first key strip 110 is fitted and installed with the first groove 15, the first key strip 110 stops the second cylinder 12 from rotating, a first nut 16 is provided axially through the first sliding portion 14, the first nut 16 is threadedly connected to the first screw rod 21, a third cylinder 13 is provided in the second cylinder 12, and the third cylinder 13 movably passes through the second cylinder cover 121.
[0036] In one of the embodiments, a third key bar 130 is provided on the inner wall of the third cylinder 13 along the axial direction, a third cylinder cover 131 is provided on the upper end of the third cylinder 13, a second sliding portion 17 is provided on the lower end of the third cylinder 13, a second groove 18 is provided on the outer surface of the second sliding portion 17 along the axial direction, a second key bar 120 is fitted and installed with the second groove 18, the second key bar 120 stops the third cylinder 13 from rotating, the second cylinder 12 telescopes and slides in the first cylinder 11, and the third cylinder 13 telescopes and slides in the second cylinder 12.
[0037] In one embodiment, the motor transmission assembly 3 includes a transmission box 30, a first bearing seat 31 is provided on one end of the transmission box 30, the first bearing seat 31 is connected and installed with the first cylinder 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 screw rod 21, and a first synchronous wheel 34 is provided below the coupling 33; a reducer 35 is provided on the other end of the transmission box 30, the reducer 35 is drivingly connected to the servo motor 4, a second synchronous wheel 36 is provided below the reducer 35, and the first synchronous wheel 34 is transmission-connected to the second synchronous wheel 36 through a synchronous belt 37.
[0038] In one of the embodiments, the screw transmission assembly 5 includes a piston 51 arranged in the third cylinder 13, and the outer surface of the piston 51 is provided with a third groove 52 along the axial direction. The third key bar 130 is adapted and installed with the third groove 52, and the third key bar 130 stops the piston 51 from rotating. A second nut 53 is axially penetrated through the piston 51, and the second nut 53 is threadedly connected to the second screw 22. A second bearing seat 54 is provided under the piston 51, and a second bearing 55 is provided in the second bearing seat 54. The second bearing 55 is rotatably connected to the upper end of the first screw 21, and the second bearing 55 clamps the upper end of the first screw 21, and the first screw 21 rotates freely in the second bearing 55.
[0039] In one of the embodiments, the idle connection assembly 6 includes a third bearing seat 61 installed under the third cylinder head 131, and a third bearing 62 is provided in the third bearing seat 61. The third bearing 62 is rotatably connected to the upper end of the second screw rod 22. The third bearing 62 clamps the upper end of the second screw rod 22, and the second screw rod 22 rotates freely in the third bearing 62.
[0040] In another embodiment, the present invention also provides a control principle of a heavy-duty multi-section telescopic electric cylinder: the servo motor 4 can drive the motor transmission assembly 3 to rotate forward and reversely through the reducer 35, and the coupling 33 in the motor transmission assembly 3 is connected and installed with the lower end of the first screw 21 in the screw group 2, so that the coupling 33 can rotate freely in the first bearing 32, and the motor transmission assembly 3 that rotates forward and reverse can drive the first screw 21 in the screw group 2 to rotate forward and reverse synchronously through the coupling 33. It is also provided with a first sliding portion 14 at the lower end of the second cylinder 12 in the cylinder group 1, and a first nut 16 is axially penetrated through the first sliding portion 14, and the first nut 16 is threadedly connected with the first screw 21; when the first screw 21 rotates under the drive of the servo motor 4 and drives the first nut 16 to move upward on the first screw 21, the first nut 16 drives the second cylinder 12 to rise through the first sliding portion 14 to realize the second cylinder 12 to move outward in the first cylinder 11. On the contrary, when the first screw rod 21 rotates in the opposite direction driven by the servo motor 4, the first nut 16 can be driven to move downward on the first screw rod 21. The first nut 16 drives the second cylinder 12 to return to its original position and move downward through the first sliding portion 14 to achieve the retraction or contraction movement of the second cylinder 12 in the first cylinder 11.
[0041] Since the second screw rod 22 is axially penetrated through the first screw rod 21, a slider 24 is provided at the lower end of the second screw rod 22, and the transverse section of the slider 24 is set to be elliptical, and the inner wall of the first screw rod 21 and the outer shape of the slider 24 are set to be compatible, the slider 24 can slide back and forth in the first screw rod 21, and the first screw rod 21 can drive the second screw rod 22 to rotate in the same direction through the slider 24. The piston 51 is provided in the third cylinder 13, and a second nut 53 is axially penetrated through the piston 51. The second nut 53 in the screw transmission assembly 5 is threadedly connected with the second screw 22. A second bearing seat 54 is provided under the piston 51. A second bearing 55 is provided in the second bearing seat 54. The second bearing 55 is rotatably connected to the upper end of the first screw 21. The second bearing 55 clamps the upper end of the first screw 21 so that the first screw 21 can rotate freely in the second bearing 55 to ensure that the verticality and force of the first screw 21 are good. The thread of the first screw 21 and the thread of the second screw 22 are set in opposite directions. When the second screw 22 rotates in the second nut 53 under the drive of the first screw 21 and extends or rises, the second screw 22 can extend or rise in the first screw 21. On the contrary, when the second screw rod 22 rotates in the opposite direction and moves downward in the second screw nut 53 under the drive of the first screw rod 21 , the second screw rod 22 can retract or move downward in the first screw rod 21 .
[0042] The third cylinder 13 is provided in the second cylinder 12, the third cylinder cover 131 is fixedly installed on the upper end of the third cylinder 13, the third cylinder cover 131 is fixedly installed with the third bearing seat 61, the 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 screw rod 22, and the third bearing 62 clamps the upper end of the second screw rod 22, so that the second screw rod 22 can rotate freely in the third bearing 62. When the second screw rod 22 is extended or raised, it can drive the third bearing 62, the third bearing seat 61 and the third cylinder cover 131 to extend or rise synchronously, and the extension or rise of the third cylinder cover 131 can drive the third cylinder 13 to extend or rise synchronously, so that the third cylinder 13 can realize the extension or rise movement in the second cylinder 12.
[0043] When the second screw rod 22 extends or rises inside the first screw rod 21, the first screw rod 21 is relatively stationary in the axial direction relative to the first cylinder 11. The first screw rod 21 drives the second cylinder 12 to extend or rise inside the first cylinder 11 through the first nut 16. At the same time, the third cylinder 13 can synchronously extend or rise inside the second cylinder 12, which enables the third cylinder 13 to extend or rise by double the stroke relative to the first cylinder 11, thereby greatly improving the stroke of the electric cylinder, thereby solving the problem of short extension stroke of multi-section electric cylinders currently on the market.
[0044] When the first sliding portion 14 of the second cylinder 12 performs telescopic movement or lifting and sliding of the piston 51 in the first cylinder 11, the piston 51 performs telescopic movement or lifting and sliding of the piston 51 in the third cylinder 13, so that the electric cylinder will not shake during the telescopic movement or lifting and sliding, so as to ensure that the electric cylinder can achieve high-precision linear motion; in addition, it is provided with an idle connection component 6 at the other end connected to the servo motor 4 and the third cylinder cover 131 and the third bearing seat 61 are fixedly installed to drive the third cylinder 13 to perform telescopic movement or lifting movement in the second cylinder 12, so that the verticality and force of the double-end driven multi-section cylinder to perform telescopic movement or lifting movement are greatly improved, and it has the advantages of higher transmission accuracy, better stability, better rigidity, stronger shear resistance and greater bearing capacity, so as to solve the problems of low transmission accuracy, poor stability, poor rigidity, weak shear resistance, small bearing capacity and low verticality caused by the sliding telescopic structure of the cylinder of the multi-section electric cylinder on the market being only arranged in one end of the electric cylinder.
[0045] Its overall structural design not only enables the second cylinder 12 to perform telescopic movement or lifting movement in the first cylinder 11, but also the third cylinder 13 to perform telescopic movement or lifting movement in the second cylinder 12 synchronously, so that it can greatly improve the overall telescopic speed or lifting speed of the electric cylinder and ensure that its telescopic speed or lifting speed is the fastest. It has the advantage of high transmission efficiency and solves the problem of slow telescopic speed of multi-section electric cylinders currently on the market. And its multi-section telescopic structure and multi-section synchronous telescopic operation mode enable it to achieve the purpose of long extension stroke, simple structure, strong versatility and application and installation in narrow space environment without adopting the structure of super-long cylinder body, and has the advantage of small size, so as to solve the problem that the electric cylinder with large stroke on the market needs to adopt the structural design of super-long cylinder body, which leads to the problem that the electric cylinder is too long, poor versatility and limited application in narrow space environment. In addition, it only uses one power source (servo motor) to control multiple cylinders to perform multi-section telescopic or multi-section lifting synchronously, so as to reduce the power source, so that it can reduce production costs.
[0046] The above embodiment is only an example of the present invention and is not intended to limit the implementation and scope of rights of the present invention. Any technical solution that is identical or equivalent to the content described in the claims of the present invention should be included in 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.