Square heavy-load radial-resistant multi-section telescopic electric cylinder

Abstract

The square heavy-load radial-resisting multi-section telescopic electric cylinder comprises a transmission assembly, a servo motor is arranged on the transmission assembly, a first bearing assembly is further arranged on the transmission assembly, a first cylinder barrel is arranged on the first bearing assembly, a second cylinder barrel is embedded in the first cylinder barrel, and the second cylinder barrel slides in the first cylinder barrel in a telescopic mode. A third cylinder barrel is embedded in the second cylinder barrel and slides in the second cylinder barrel in a telescopic mode, a first lead screw is arranged in the third cylinder barrel, the first lead screw is sleeved with a second lead screw, a connecting block is arranged at the upper end of the first lead screw, and the first lead screw drives the second lead screw to synchronously rotate forwards and backwards through the connecting block. The second cylinder barrel can completely retract into the first cylinder barrel, the third cylinder barrel can completely retract into the second cylinder barrel, the size of the electric cylinder is minimized, the stroke of the electric cylinder is maximized, the problems that a traditional electric cylinder is large in size and short in longest stroke are solved, and the service life of the electric cylinder is prolonged. The problems that an electric cylinder of an existing structure bears small radial force and is small in torque and poor in precision are solved.

Description

Technical Field

[0001] The utility model relates to the field of electric cylinders, in particular to a square heavy-load anti-radial multi-section lifting and retracting electric cylinder. Background Art

[0002] The demand for intelligent robotic arms in the smart production line of Industry 6.0 is increasing, and various types of intelligent robotic arms are used in various industries. The robotic arms are installed on multi-section telescopic electric cylinders, which require strict requirements on accuracy, shape variation, radial resistance, etc. during the rapid rotation, rise and grasping of the robotic arms. Ordinary multi-section telescopic electric cylinders can no longer meet these technical requirements.

[0003] For example, the ball screw multi-section telescopic electric cylinder disclosed in the Chinese utility model patent with announcement number CN205489951U realizes the multi-section telescopic function when in use to meet the needs of various industries for long stroke, small installation space and high precision requirements. However, the ball screw multi-section telescopic electric cylinder cannot withstand radial force when in use. After it is installed on the robot arm, the rotation radius and high-speed rotation speed of the robot arm directly affect the size of the radial force and torque borne by the electric cylinder, resulting in limited lead of each cylinder barrel rising or telescoping, and each cylinder barrel cannot achieve the maximum output stroke. Therefore, only by updating the internal and external structures of the electric cylinder can it withstand high radial force and torque. It is necessary to propose a square heavy-load anti-radial multi-section lifting and retracting electric cylinder in this field to solve the above-mentioned problems. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a square heavy-duty anti-radial multi-section telescopic electric cylinder, the overall structural design of which enables the second cylinder barrel to be completely retracted into the first cylinder barrel, and the third cylinder barrel to be completely retracted into the second cylinder barrel, thereby minimizing the volume of the electric cylinder, so as to solve the problem that the current electric cylinder structure cannot achieve a small installation space or a small volume; and the longest stroke of the second cylinder barrel can extend out of the first cylinder barrel, and the longest stroke of the third cylinder barrel can extend out of the second cylinder barrel, so that the longest stroke drive of the electric cylinder is greatly increased; the utility model provides a first end cover at the upper end of the first cylinder barrel, and the center of the first end cover is central The utility model is hollow, the first end cover is sleeved on the second cylinder, the second end cover is provided on the upper end of the second cylinder, the center of the first end cover is hollow, and the second end cover is sleeved on the third cylinder, so that the second cylinder slides linearly in the first cylinder through the first piston part, and the third cylinder slides linearly in the second cylinder through the second piston part to offset part of the radial force, which not only ensures the straightness of the electric cylinder during telescopic operation, but also ensures the accuracy and stability of the electric cylinder during operation, so that it can withstand greater radial force and torque, so as to solve the problems of small radial force, small torque and poor accuracy of the electric cylinder with current structure. The utility model is realized through the following technical solutions:

[0005] A square heavy-load anti-radial multi-section telescopic electric cylinder comprises a transmission assembly, a servo motor is provided on the transmission assembly, the servo motor is driven and connected to the transmission assembly through a reducer, a first bearing assembly is also provided on the transmission assembly, a first cylinder is provided on the first bearing assembly, a second cylinder is embedded in the first cylinder, the second cylinder telescopes and slides in the first cylinder, a third cylinder is embedded in the second cylinder, the third cylinder telescopes and slides in the second cylinder, a coupling is provided in the first bearing assembly, a first screw rod is provided in the third cylinder, a second screw rod is provided outside the first screw rod, a connecting block is provided on the upper end of the first screw rod, the first screw rod drives the second screw rod to rotate synchronously in forward and reverse directions through the connecting block, the transmission assembly is driven and connected to the first screw rod through a coupling, and a second bearing assembly is provided on the second screw rod.

[0006] By adopting the above technical solution, the second cylinder is completely retracted into the first cylinder, and the third cylinder is completely retracted into the second cylinder. This design can minimize the volume of the electric cylinder. Since the longest stroke of the second cylinder extends out of the first cylinder, and the longest stroke of the third cylinder extends out of the second cylinder, the longest stroke drive of the electric cylinder is realized to solve the needs of various industries for driving sources (electric cylinders) with long strokes and small installation spaces.

[0007] Preferably, the outer contour of the connecting block is adapted to the shape contour of the inner cavity of the second screw rod, the connecting block can slide back and forth in the inner cavity of the second screw rod, a convex strip is provided on the side of the connecting block, and a groove is provided on the inner wall of the second screw rod, the convex strip and the groove are adapted to each other, so that the inner cavity of the second screw rod can stop the connecting block from rotating.

[0008] Preferably, a first piston portion is provided at the lower end of the second cylinder, and the center of the first piston portion is hollow. A first nut is fixedly installed in the first piston portion, and the first nut is spirally sleeved on the first screw rod. The outer contour of the first piston portion is matched with the shape contour of the inner cavity of the first cylinder, and the inner cavity of the first cylinder stops the first piston portion from rotating. The first screw rod rotates forward and reversely to drive the first nut and the second cylinder to rise and fall and slide in the first cylinder.

[0009] By adopting the above-mentioned technical solution, when the first servo motor drives the first screw rod to rotate forward and reversely, it can drive the first nut to rise and fall or slide back and forth synchronously. Since the first nut is fixedly installed in the first piston part, the first piston part is connected and installed with the second cylinder, when the first nut is lifted or reciprocated, it can drive the first piston part and the second cylinder to rise and fall or slide back and forth synchronously in the first cylinder.

[0010] Preferably, a second piston part is provided at the lower end of the third cylinder, and the center of the second piston part is hollow. A second nut is fixedly installed inside the second piston part, and the second nut is spirally sleeved on the second screw rod. The outer contour of the second piston part is matched with the shape contour of the inner cavity of the second cylinder, and the inner cavity of the second cylinder stops the second piston part from rotating. The second screw rod rotates forward and reversely to drive the second nut and the third cylinder to rise and fall and slide inside the second cylinder.

[0011] By adopting the above-mentioned technical scheme, a connecting block is provided at the upper end of the first screw rod. When the first screw rod rotates forward and reversely, the connecting block can drive the second screw rod to rotate forward and reverse synchronously. When the second screw rod rotates forward and reversely, it can drive the second nut and the second piston part to perform synchronous lifting and lowering sliding or reciprocating sliding. When the second piston part lifts and slides or reciprocates, it can drive the third cylinder to slide telescopically or reciprocatingly, so that the third cylinder can slide telescopically or reciprocatingly in the second cylinder.

[0012] Preferably, the first bearing assembly comprises a first bearing seat, the center of the first bearing seat is hollow, a first bearing is fixedly installed in the first bearing seat, the first bearing is connected to the coupling sleeve, and the coupling can rotate in the first bearing.

[0013] By adopting the above technical solution, since the first bearing is fixedly installed in the first bearing seat, the first bearing is connected to the coupling in a sleeve, and when the coupling rotates under the drive of the servo motor, it can rotate in the first bearing.

[0014] Preferably, the second bearing assembly includes a second bearing seat, the center of the second bearing seat is hollow, the second bearing seat is fixedly mounted on the first piston part, a second bearing is fixedly mounted in the second bearing seat, the lower end of the second screw rod is connected to the second bearing sleeve, the second screw rod can rotate in the second bearing, and the second screw rod, the second bearing and the second bearing seat move up and down with the first piston part.

[0015] By adopting the above-mentioned technical solution, when the coupling rotates under the drive of the servo motor, it can drive the second screw rod to rotate synchronously, and the lower end of the second screw rod is connected to the second bearing set. This design prevents the second screw rod from being separated from the second bearing, thereby ensuring the high operating accuracy of the second screw rod.

[0016] Preferably, the first cylinder has a first end cover at the upper end thereof, the center of the first end cover is hollow, and the first end cover is sleeved on the second cylinder; the second cylinder has a second end cover at the upper end thereof, the center of the first end cover is hollow, and the second end cover is sleeved on the third cylinder, and the third cylinder has a mounting and fixing end cover at the upper end thereof. The mounting and fixing end cover refers to a fixing cover that can be mounted on the upper end of the third cylinder.

[0017] By adopting the above technical solution, a first end cover is provided at the upper end of the first cylinder, the center of the first end cover is hollow, the first end cover is sleeved on the second cylinder, a second end cover is provided at the upper end of the second cylinder, the center of the first end cover is hollow, and the second end cover is sleeved on the third cylinder, so that the second cylinder slides linearly in the first cylinder through the first piston part, and the third cylinder slides linearly in the second cylinder through the second piston part to offset part of the radial force, which ensures the straightness of the electric cylinder during the telescopic operation, and ensures its accuracy and stability during operation, so that it can withstand greater radial force and torque.

[0018] Preferably, the transmission assembly includes a transmission box, in which a first synchronous wheel and a second synchronous wheel are provided, the first synchronous wheel is connected and installed with the output shaft of the reducer, the second synchronous wheel is connected and installed with the first screw rod through a coupling, and the first synchronous wheel is driven and connected with the second synchronous wheel through a synchronous belt.

[0019] By adopting the above technical solution, the servo motor can drive the first synchronous wheel to rotate forward and reverse through the reducer, and the first synchronous wheel can drive the second synchronous wheel to rotate forward and reverse synchronously through the synchronous belt, and when the second synchronous wheel rotates forward and reverse, it can drive the first screw rod to rotate forward and reverse synchronously through the coupling.

[0020] Compared with the existing technology, the beneficial effects of the utility model are: 1. A first cylinder is provided on the first bearing assembly, a second cylinder is embedded in the first cylinder, a third cylinder is embedded in the second cylinder, the second cylinder can be completely retracted into the first cylinder, and the third cylinder can be completely retracted into the second cylinder, which minimizes the volume of the electric cylinder; and the longest stroke of the second cylinder can extend out of the first cylinder, and the longest stroke of the third cylinder can extend out of the second cylinder, which maximizes the longest stroke drive of the electric cylinder, thereby solving the problem that the traditional structure of the electric cylinder is large in volume and short in longest stroke, which makes it unable to meet the needs of various industries for a driving source with a long stroke, a small installation space or a small volume.

[0021] 2. When the second cylinder extends out of the first cylinder by the longest stroke, the first screw rod simultaneously extends out of the second screw rod by the longest stroke, and the third cylinder can also extend out of the second cylinder by the longest stroke, which realizes the longest stroke drive of the electric cylinder and greatly increases the longest stroke drive of the electric cylinder, so as to solve the problem that the current ball screw multi-section telescopic electric cylinder has limited rising lead and cannot achieve the longest stroke output.

[0022] 3. A first end cover is provided at the upper end of the first cylinder, the center of the first end cover is hollow, the first end cover is sleeved on the second cylinder, a second end cover is provided at the upper end of the second cylinder, the center of the first end cover is hollow, and the second end cover is sleeved on the third cylinder, so that the second cylinder slides linearly in the first cylinder through the first piston part, and the third cylinder slides linearly in the second cylinder through the second piston part to offset part of the radial force, which not only ensures the straightness of the electric cylinder during telescopic operation, but also ensures the accuracy and stability of the electric cylinder during operation, so that it can withstand greater radial force and torque, so as to solve the problems of small radial force, small torque and poor accuracy of the electric cylinder with current structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] For ease of explanation, the present invention is described in detail with reference to the following preferred embodiments and accompanying drawings.

[0024] Figure 1 It is a stereoscopic diagram of the square heavy-load anti-radial multi-section telescopic electric cylinder of the utility model.

[0025] Figure 2 This is a three-dimensional diagram of the square heavy-load anti-radial multi-section telescopic electric cylinder of the utility model with the first cylinder barrel, the second cylinder barrel and the third cylinder barrel removed.

[0026] Figure 3 It is a schematic diagram of the cross-sectional structure of the square heavy-load anti-radial multi-section telescopic electric cylinder of the utility model. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The drawings provide preferred embodiments of the present invention. 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 and comprehensively understood.

[0028] 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 herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0029] In this embodiment, refer to Figures 1 to 3As shown, the square heavy-load anti-radial multi-section telescopic electric cylinder of the utility model comprises a transmission assembly 1, on which a servo motor 2 is provided, which is driven and connected to the transmission assembly 1 through a reducer 3, and on which a first bearing assembly 4 is further provided, on which a first cylinder 51 is provided, in which a second cylinder 52 is embedded, and the second cylinder 52 telescopically slides in the first cylinder 51, and a third cylinder 53 is embedded in the second cylinder 52, and the third cylinder 53 telescopically slides in the second cylinder 52, and a coupling 6 is provided in the first bearing assembly 4, and a first screw rod 71 is provided in the third cylinder 53, and a second screw rod 72 is provided outside the first screw rod 71, and a connecting block 8 is provided at the upper end of the first screw rod 71, and the first screw rod 71 drives the second screw rod 72 to rotate synchronously in forward and reverse directions through the connecting block 8, and the transmission assembly 1 is driven and connected to the first screw rod 71 through the coupling 6, and a second bearing assembly 9 is provided on the second screw rod 72.

[0030] In one of the embodiments, the outer contour of the connecting block 8 is adapted to the shape contour of the inner cavity of the second screw rod 72, and the connecting block 8 can slide back and forth in the inner cavity of the second screw rod 72. A convex strip 81 is provided on the side of the connecting block 8, and a groove is provided on the inner wall of the second screw rod 72. The convex strip 81 and the groove are adapted to each other, and the inner cavity of the second screw rod 72 stops the connecting block 8 from rotating.

[0031] In one of the embodiments, a first piston portion 10 is provided at the lower end of the second cylinder 52. The center of the first piston portion 10 is hollow. A first nut 11 is fixedly installed in the first piston portion 10. The first nut 11 is spirally sleeved on the first screw rod 71. The outer contour of the first piston portion 10 is matched with the shape contour of the inner cavity of the first cylinder 51. The inner cavity of the first cylinder 51 stops the first piston portion 10 from rotating. The first screw rod 71 rotates forward and reversely to drive the first nut 11 and the second cylinder 52 to rise and fall and slide in the first cylinder 51.

[0032] In one of the embodiments, a second piston portion 12 is provided at the lower end of the third cylinder 53, and the center of the second piston portion 12 is hollow. A second nut 13 is fixedly installed in the second piston portion 12, and the second nut 13 is spirally sleeved on the second screw rod 72. The outer contour of the second piston portion 12 is adapted to the shape contour of the inner cavity of the second cylinder 52. The inner cavity of the second cylinder 52 stops the second piston portion 12 from rotating, and the second screw rod 72 rotates forward and reversely to drive the second nut 13 and the third cylinder 53 to rise and fall and slide in the second cylinder 52.

[0033] In one embodiment, the first bearing assembly 4 includes a first bearing seat 41 , the center of the first bearing seat 41 is hollow, a first bearing 42 is fixedly installed in the first bearing seat 41 , the first bearing 42 is sleeve-connected to the coupling 6 , and the coupling 6 can rotate in the first bearing 42 .

[0034] In one embodiment, the second bearing assembly 9 includes a second bearing seat 91, the center of the second bearing seat 91 is hollow, the second bearing seat 91 is fixedly mounted on the first piston part 10, a second bearing 92 is fixedly mounted in the second bearing seat 91, the lower end of the second screw rod 72 is sleevedly connected to the second bearing 92, the second screw rod 72 can rotate in the second bearing 92, and the second screw rod 72, the second bearing 92 and the second bearing seat 91 can telescope, slide or lift and lower along with the first piston part 10.

[0035] In one embodiment, a first end cover 14 is provided at the upper end of the first cylinder 51, the center of the first end cover 14 is hollow, and the first end cover 14 is sleeved on the second cylinder 52; a second end cover 15 is provided at the upper end of the second cylinder 52, the center of the first end cover 14 is hollow, and the second end cover 15 is sleeved on the third cylinder 53, and a mounting and fixing end cover 16 is provided at the upper end of the third cylinder 53.

[0036] In one embodiment, the transmission assembly 1 includes a transmission box 17, in which a first synchronous wheel 18 and a second synchronous wheel 19 are provided. The first synchronous wheel 18 is connected and installed with the output shaft of the reducer 3, and the second synchronous wheel 19 is connected and installed with the first screw rod 71 through a coupling 6. The first synchronous wheel 18 is driven and connected with the second synchronous wheel 19 through a synchronous belt.

[0037] In one of the embodiments, the structural design principle of the square heavy-load anti-radial multi-section telescopic electric cylinder is as follows: a servo motor 2 is provided on the transmission assembly 1, and the servo motor 2 is driven and connected to the transmission assembly 1 through a reducer 3. The transmission assembly 1 is also provided with a first bearing assembly 4, and a first cylinder 51 is provided on the first bearing assembly 4. The first cylinder 51 is embedded with a second cylinder 52, and the second cylinder 52 is embedded with a third cylinder 53. A first screw rod 71 is provided in the third cylinder 53, and a second screw rod 72 is provided outside the first screw rod 71. A connecting block 8 is provided at the upper end of the first screw rod 71, and the connecting block 8 can slide back and forth in the inner cavity of the second screw rod 72. The outer contour of the connecting block 8 is set to match the shape contour of the inner cavity of the second screw rod 72, and a convex strip 81 is provided on the side of the connecting block 8 and a groove is provided on the inner side wall of the second screw rod 72, and the convex strip 81 and the groove are adapted to each other, so that the inner cavity of the second screw rod 72 can stop the connecting block 8 from rotating. The center of the first bearing seat 41 is hollow and a first bearing 42 is fixedly installed in the first bearing seat 41 . The first bearing 42 is sleeve-connected with the coupling 6 , so that the coupling 6 can rotate in the first bearing 42 .

[0038] The first piston part 10 is provided at the lower end of the second cylinder 52, and the center of the first piston part 10 is hollow. The first nut 11 is fixedly installed in the first piston part 10, and the first nut 11 is spirally sleeved on the first screw rod 71, and the outer contour of the first piston part 10 is adapted to the shape contour of the inner cavity of the first cylinder 51, so that the inner cavity of the first cylinder 51 can stop the first piston part 10. When the servo motor 2 drives the first synchronous wheel 18 to rotate forward and reverse through the reducer 3, the first synchronous wheel 18 can drive the second synchronous wheel 19 to rotate forward and reverse synchronously through the synchronous belt, and when the second synchronous wheel 19 rotates forward and reverse, it can drive the first screw rod 71 to rotate forward and reverse synchronously through the coupling 6, and when the first screw rod 71 rotates forward and reverse, it can drive the first nut 11 and the first piston part 10 to slide back and forth synchronously, and when the first piston part 10 slides back and forth, it can drive the second cylinder 52 to slide telescopically in the first cylinder 51.

[0039] The second bearing seat 91 is fixedly mounted on the first piston part 10, the center of the second bearing seat 91 is hollow, a second bearing 92 is fixedly mounted in the second bearing seat 91, and the lower end of the second screw rod 72 is connected with the second bearing 92. This design not only prevents the second screw rod 72 from being separated from the second bearing 92, but also allows the second screw rod 72 to rotate in the second bearing 92, and ensures the high running accuracy of the second screw rod 72. At the same time, a second piston part 12 is provided at the lower end of the third cylinder 53, the center of the second piston part 12 is hollow, a second nut 13 is fixedly mounted in the second piston part 12, and the second nut 13 is spirally sleeved on the second screw rod 72, and the outer contour of the second piston part 12 is set to match the shape contour of the inner cavity of the second cylinder 52, so that the inner cavity of the second cylinder 52 can stop the second piston part 12 from rotating. When the first screw rod 71 rotates forward and reversely, the connecting block 8 can drive the second screw rod 72 to rotate forward and reverse synchronously. When the second screw rod 72 rotates forward and reversely, it can drive the second nut 13 and the second piston part 12 to perform linear reciprocating motion synchronously. When the second piston part 12 performs linear reciprocating motion, it can drive the third cylinder 53 to perform telescopic sliding in the second cylinder 52, that is, it enables the third cylinder 53 to achieve telescopic sliding in the second cylinder 52.

[0040] When the first screw rod 71 extends out of the second screw rod 72 at the longest stroke under the drive of the servo motor 2, the longest stroke of the second cylinder 52 extends out of the first cylinder 51 at the same time. Since the first screw rod 71 and the second screw rod 72 rotate synchronously under the drive of the servo motor 2, the second screw rod 72 can drive the second nut 13, the second piston part 12 and the third cylinder 53 to slide telescopically in the second cylinder 52 when rotating forward and reversely. Therefore, when the longest stroke of the first screw rod 71 extends out of the second screw rod 72, the longest stroke of the second cylinder 52 extends out of the first cylinder 51 at the same time, and the longest stroke of the third cylinder 53 extends out of the second cylinder 52 at the same time under the drive of the second screw rod 72. At this time, the electric cylinder achieves the longest stroke drive.

[0041] A first end cover 14 is provided at the upper end of the first cylinder 51, the center of the first end cover 14 is hollow, and the first end cover 14 is sleeved on the second cylinder 52; a second end cover 15 is provided at the upper end of the second cylinder 52, the center of the first end cover 14 is hollow, and the second end cover 15 is sleeved on the third cylinder 53; the second cylinder 52 slides linearly in the first cylinder 51 through the first piston part 10, and the third cylinder 53 slides linearly in the second cylinder 52 through the second piston part 12. This design can offset part of the radial force, ensure the straightness of the electric cylinder during the telescopic operation, and ensure its accuracy and stability during operation, so that it can withstand greater radial force and torque, so as to solve the problems of small radial force, small torque and poor operation accuracy of the electric cylinder with current structure.

[0042] Its overall structural design enables the second cylinder 52 to be completely retracted into the first cylinder 51, and the third cylinder 53 to be completely retracted into the second cylinder 52, thereby minimizing the volume of the electric cylinder; and the longest stroke of the second cylinder 52 can extend out of the first cylinder 51, and the longest stroke of the third cylinder 53 can extend out of the second cylinder 52, which greatly increases the longest stroke drive of the electric cylinder (that is, it maximizes the longest stroke of the electric cylinder) to meet the needs of various industries for long-stroke, small installation space and high-precision driving sources. It not only solves the problem that electric cylinders with traditional structures cannot achieve long stroke, small installation space and high precision, it also solves the problem that the current multi-section telescopic electric cylinders cannot achieve the longest stroke output due to small radial force and small torque.

[0043] 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. A square heavy-load anti-radial multi-section telescopic electric cylinder, comprising a transmission assembly (1), wherein a servo motor (2) is provided on the transmission assembly (1), and the servo motor (2) is connected to the transmission assembly (1) through a reducer (3), and is characterized in that: The transmission assembly (1) is also provided with a first bearing assembly (4), the first bearing assembly (4) is provided with a first cylinder (51), the first cylinder (51) is embedded with a second cylinder (52), the second cylinder (52) is telescopically slidable in the first cylinder (51), the second cylinder (52) is embedded with a third cylinder (53), the third cylinder (53) is telescopically slidable in the second cylinder (52); the first bearing assembly (4) is provided with a coupling (6), the third cylinder (53) is provided with a first screw rod (71), the first screw rod (71) is provided with a second screw rod (72) on its outer sleeve, the first screw rod (71) is provided with a connecting block (8) at the upper end, the first screw rod (71) drives the second screw rod (72) to rotate synchronously in forward and reverse directions through the connecting block (8), the transmission assembly (1) is drivingly connected to the first screw rod (71) through the coupling (6), and the second screw rod (72) is provided with a second bearing assembly (9) on its outer sleeve.

2. According to claim 1, the square heavy-load anti-radial multi-section lifting and retracting electric cylinder is characterized in that: The outer contour of the connecting block (8) is matched with the inner contour of the second screw rod (72), and the connecting block (8) can slide back and forth in the inner cavity of the second screw rod (72). A convex strip (81) is provided on the side of the connecting block (8), and a groove is provided on the inner wall of the second screw rod (72). The convex strip (81) and the groove are matched, and the inner cavity of the second screw rod (72) stops the connecting block (8) from rotating.

3. The square heavy-load anti-radial multi-section lifting and retracting electric cylinder according to claim 1 is characterized in that: A first piston part (10) is provided at the lower end of the second cylinder (52). The center of the first piston part (10) is hollow. A first nut (11) is fixedly installed in the first piston part (10). The first nut (11) is spirally sleeved on the first screw rod (71). The outer contour of the first piston part (10) is matched with the shape contour of the inner cavity of the first cylinder (51). The inner cavity of the first cylinder (51) stops the first piston part (10) from rotating. The first screw rod (71) rotates forward and reversely to drive the first nut (11) and the second cylinder (52) to rise and fall and slide in the first cylinder (51).

4. The square heavy-load anti-radial multi-section lifting and retracting electric cylinder according to claim 1 is characterized in that: A second piston part (12) is provided at the lower end of the third cylinder (53). The center of the second piston part (12) is hollow. A second nut (13) is fixedly installed in the second piston part (12). The second nut (13) is spirally sleeved on the second screw rod (72). The outer contour of the second piston part (12) is matched with the shape contour of the inner cavity of the second cylinder (52). The inner cavity of the second cylinder (52) stops the second piston part (12) from rotating. The second screw rod (72) rotates forward and reversely to drive the second nut (13) and the third cylinder (53) to rise and fall and slide in the second cylinder (52).

5. The square heavy-load anti-radial multi-section lifting and retracting electric cylinder according to claim 1 is characterized in that: The first bearing assembly (4) comprises a first bearing seat (41), the center of the first bearing seat (41) is hollow, a first bearing (42) is fixedly installed in the first bearing seat (41), the first bearing (42) is sleeve-connected to the coupling (6), and the coupling (6) can rotate in the first bearing (42).

6. The square heavy-load anti-radial multi-section lifting and retracting electric cylinder according to claim 1 or 3, characterized in that: The second bearing assembly (9) comprises a second bearing seat (91), the center of the second bearing seat (91) is hollow, the second bearing seat (91) is fixedly mounted on the first piston part (10), a second bearing (92) is fixedly mounted in the second bearing seat (91), the lower end of the second screw rod (72) is sleeve-connected to the second bearing (92), the second screw rod (72) can rotate in the second bearing (92), and the second screw rod (72), the second bearing (92) and the second bearing seat (91) move up and down along with the first piston part (10).

7. The square heavy-load anti-radial multi-section lifting and retracting electric cylinder according to claim 1 is characterized in that: A first end cover (14) is provided at the upper end of the first cylinder (51), the center of the first end cover (14) is hollow, and the first end cover (14) is sleeved on the second cylinder (52); a second end cover (15) is provided at the upper end of the second cylinder (52), the center of the first end cover (14) is hollow, and the second end cover (15) is sleeved on the third cylinder (53), and a mounting and fixing end cover (16) is provided at the upper end of the third cylinder (53).

8. The square heavy-load anti-radial multi-section lifting and retracting electric cylinder according to claim 1 is characterized in that: The transmission assembly (1) comprises a transmission box (17), wherein a first synchronous wheel (18) and a second synchronous wheel (19) are arranged in the transmission box (17), wherein the first synchronous wheel (18) is connected to the output shaft of the reducer (3), and the second synchronous wheel (19) is connected to the first screw rod (71) via a coupling (6), and the first synchronous wheel (18) is drivingly connected to the second synchronous wheel (19) via a synchronous belt.

Images