Super-heavy-load efficient direct-drive five-section electric cylinder

Abstract

The utility model discloses a super-heavy-load efficient direct-drive five-section electric cylinder. A slide wire torsion bar is provided with a first-stage ball screw, a second-stage ball screw, a third-stage ball screw, a fourth-stage ball screw and a fifth-stage outer pipe which are sequentially sleeved from inside to outside and are matched in pairs through a screw nut pair, wherein the first-stage ball screw, the second-stage ball screw, the third-stage ball screw, the fourth-stage ball screw and the fifth-stage outer pipe are hollow; the fifth-stage outer pipe is sequentially sleeved with a fourth-stage outer pipe, a third-stage outer pipe and a second-stage outer pipe which can slide mutually in the axial direction from inside to outside, and the ends, close to the driving end, of the first-stage outer pipe and the second-stage outer pipe are rigidly connected with the end, close to the driving end, of the second-stage ball screw; the ends, close to the driving end, of the first-stage outer pipe, the third-stage outer pipe and the fourth-stage outer pipe are concentrically and rotationally connected with the first-stage ball screw, the third-stage ball screw and the fourth-stage ball screw correspondingly, and the first-stage ball screw, the third-stage ball screw and the fourth-stage ball screw can be connected in a mutual axial sliding mode and are driven by the slide wire torsion bar to rotate synchronously. The utility model has the advantages of high speed, high efficiency, large unfolding and folding ratio, small appearance volume, light weight and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of telescopic high-efficiency multi-stage electric erection equipment, and specifically relates to an ultra-heavy-load high-efficiency five-section electric cylinder. Background Art

[0002] With the development trend of electrification technology for special vehicles, electric erection equipment is gradually replacing hydraulic erection equipment. However, the installation space of vehicle-mounted equipment is small, the erection angle is large, and the speed is fast, which requires electric cylinders to have greater performance characteristics of high speed and high efficiency while having large expansion and contraction. At present, the number of vehicle-mounted electric erection equipment used in China is at most four-section electric cylinders. With the further improvement of vehicle-mounted requirements, the speed and efficiency of electric cylinders are slightly insufficient. Therefore, it is very necessary to propose a five-section electric cylinder with higher speed and efficiency. Utility Model Content

[0003] The utility model aims to provide an ultra-heavy-load high-efficiency direct-drive five-section electric cylinder so as to achieve a larger unfolding stroke and have a higher working speed and efficiency when having the same folded length as a two-section electric cylinder, a three-section electric cylinder and a four-section electric cylinder.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0005] An ultra-heavy-load high-efficiency direct-drive five-section electric cylinder comprises a ring brake, a ring torque motor, a large gear ring, a small gear ring in a planetary gear pair, and a sliding wire torsion bar whose driving end is driven by the ring torque motor and the planetary gear pair. The sliding wire torsion bar is provided with a hollow primary ball screw, a secondary ball screw, a tertiary ball screw, a fourth ball screw and a fifth outer tube which are sequentially mounted from the inside to the outside and matched in pairs through a screw nut pair. The fifth outer tube is sequentially mounted from the inside to the outside with four axially mutually sliding balls. The first outer tube, the third outer tube, the second outer tube and the first outer tube, one end of the second outer tube close to the driving end is rigidly connected to one end of the second ball screw close to the driving end, the first outer tube, the third outer tube and the fourth outer tube close to the driving end are respectively concentrically rotatably connected to the first ball screw, the third ball screw and the fourth ball screw, the first ball screw, the third ball screw and the fourth ball screw are axially slidably connected to each other and are driven to rotate synchronously through the sliding wire torsion bar.

[0006] Furthermore, a first ball sliding key is provided on the outer periphery of the sliding wire torsion rod, a second ball sliding key is provided in the middle part, and a third ball sliding key is provided at the end away from the driving end. The first ball sliding key, the second ball sliding key and the third ball sliding key are respectively axially slidingly connected to the first-stage ball screw, the third-stage ball screw and the fourth-stage ball screw. The distance between the second ball sliding key and the end face of the first-stage ball screw away from the driving end is greater than the maximum stroke of the second-stage ball screw along the first-stage ball screw.

[0007] Furthermore, the end of the secondary ball screw close to the driving end is provided with a primary ball screw nut cooperating with the primary ball screw, the end of the tertiary ball screw close to the driving end is provided with a secondary ball screw nut cooperating with the secondary ball screw, the end of the fourth-stage ball screw close to the driving end is provided with a third-stage ball screw nut cooperating with the third-stage ball screw, and the end of the fifth-stage outer tube close to the driving end is provided with a fourth-stage ball screw nut cooperating with the fourth-stage ball screw.

[0008] Furthermore, the first ball sliding key, the second ball sliding key and the third ball sliding key on the outer periphery of the sliding wire torsion rod are respectively composed of an arc groove, a ball return device and a steel ball on the sliding wire torsion rod. Correspondingly, the first ball sliding key includes a first ball return device and a steel ball, the second ball sliding key includes a second ball return device and a steel ball, and the third ball sliding key includes a third ball return device and a steel ball.

[0009] Furthermore, the first-level outer tube is connected to the first-level ball screw via a first-level bearing, the end of the second-level outer tube close to the driving end is rigidly connected to the end of the second-level ball screw close to the driving end, the third-level outer tube is connected to the third-level ball screw via a third-level bearing, the third-level ball screw nut is connected to the fourth-level ball screw via a fourth-level bearing, the fourth-level outer tube is rigidly connected to the third-level ball screw nut, and the fifth-level outer tube is connected to the fourth-level ball screw via a fifth-level bearing.

[0010] Furthermore, mutually matching guide grooves and sliding wire guide keys are provided between the first-level outer tube and the second-level outer tube, between the second-level outer tube and the third-level outer tube, between the third-level outer tube and the fourth-level outer tube, and between the fourth-level outer tube and the fifth-level outer tube.

[0011] Furthermore, the sliding surfaces on both sides of the sliding wire guide key are embedded with steel balls, and the steel balls slide up and down in the guide groove in a point contact manner and limit the rotation between the parts.

[0012] Furthermore, the annular torque motor includes a motor fixed ring and a motor moving ring, the motor fixed ring is rigidly connected to the housing, a second rolling bearing is provided between the motor moving ring and the primary outer tube, a first rolling bearing is provided between the motor fixed ring and the motor moving ring, and a circular brake with a large braking torque is also provided at the tail of the annular torque motor.

[0013] Furthermore, the first-stage ball screw is integrated with a large ring gear in a planetary gear pair, and the small ring gear is axially fixed to the housing through a gear support bearing for rotation, and the inner ring gear integrated on the inner wall of the motor moving coil is meshed with the small ring gear in the planetary gear pair, and then the first-stage ball screw is driven to rotate through the large ring gear in the planetary gear pair.

[0014] The utility model has the following beneficial effects: the first-stage ball screw, the third-stage ball screw and the fourth-stage ball screw are connected so that they can slide axially with each other and are driven to rotate synchronously through the sliding wire torsion bar, and the first-stage outer tube and the first-stage ball screw, the third-stage outer tube and the third-stage ball screw, and the fourth-stage outer tube and the fourth-stage ball screw are arranged in a form of concentric rotatable connection. When working, the second-stage ball screw and the first-stage outer tube, the second-stage outer tube, the third-stage outer tube, the fourth-stage outer tube and the fifth-stage outer tube do not rotate, so that the rotation from the first-stage outer tube to the second-stage outer tube, the third-stage outer tube, the fourth-stage outer tube and the fifth-stage outer tube can be realized. The synchronous extension or retraction of the five-section cylinder body of the first-stage outer tube, the fourth-stage outer tube, and the fifth-stage outer tube realizes the jacking of the target and the retraction of the electric cylinder. Compared with the two-section electric cylinder, the three-section electric cylinder and the four-section electric cylinder, it can achieve a larger expansion and folding ratio. Under the same folding length, the expansion stroke is longer, the speed is faster, and the efficiency is higher. It can achieve a larger jacking height, operating speed and efficiency, so it is more suitable for working scenarios with small installation space, large erection angle, high speed and high efficiency, and large expansion and folding ratio, such as vehicle-mounted equipment.

[0015] The first ball sliding key, the second ball sliding key, the third ball sliding key on the outer periphery of the sliding wire torsion bar, and the ball guide keys between the first-level outer tube and the second-level outer tube, the second-level outer tube and the third-level outer tube, the third-level outer tube and the fourth-level outer tube, and the fourth-level outer tube and the fifth-level outer tube, change the traditional sliding surface contact into sliding point contact, reduce the friction between the components, and improve the working efficiency of the entire electric cylinder.

[0016] The thin-walled annular torque motor and planetary gear pair wrap the electric cylinder structure very well. The radial and axial dimensions of the electric cylinder are much smaller than those of traditional electric cylinders, which solves the problem of limited space very well. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model;

[0018] Figure 2 This is a schematic diagram of the overall structure of a traditional two-section electric cylinder;

[0019] Figure 3This is a schematic diagram of the structure of a planetary gear pair according to an embodiment of the utility model;

[0020] Figure 4 It is a schematic diagram of a traditional gear reduction mechanism;

[0021] Figure 5 This is a schematic diagram of the sliding wire torsion bar structure of an embodiment of the utility model;

[0022] Figure 6 yes Figure 5 Left view of

[0023] Figure 7 yes Figure 5 Right view of;

[0024] Figure 8 This is a schematic diagram of the structure of the bead return device of the utility model embodiment;

[0025] Fig. 9 yes Figure 8 AA section view;

[0026] Description of Figure Numbers:

[0027] Upper interface (1), fifth-stage outer tube (2), fourth-stage outer tube (3), third-stage outer tube (4), second-stage outer tube (5), first-stage outer tube (6), fourth-stage ball screw (7), third-stage ball screw (8), second-stage ball screw (9), first-stage ball screw (10), sliding wire torsion bar (11), sliding wire guide key (12), fifth-stage bearing (13), fourth-stage bearing (14), third-stage ball screw nut (15), third-stage bearing (16), first-stage bearing (17), screw support bearing (18), lower interface (19), housing (20), inner gear ring (21 ), a motor moving coil (22), a first rolling bearing (23), a motor fixed coil (24), a first ball sliding key (25), a circular torque motor (26), a circular brake (27), a second ball sliding key (28), a third ball sliding key (29), a planetary gear (30), an annular planetary support (31), a second rolling bearing (32), a large gear ring (33), a small gear ring (34), a gear support bearing (35), a four-stage ball screw nut (36), a first ball return device (37), a second ball return device (38), and a third ball return device (39). DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, each embodiment of the utility model will be described in detail below in conjunction with the accompanying drawings. However, it can be understood by those skilled in the art that in each embodiment of the utility model, many technical details are proposed in order to enable readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed in the present application can also be implemented. The division of the following embodiments is for the convenience of description, and should not constitute any limitation on the specific implementation of the utility model. The various embodiments can be combined and referenced with each other under the premise of no contradiction.

[0029] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] Reference Figure 1 The ultra-heavy-load high-efficiency direct-drive five-section electric cylinder of this embodiment includes a ring brake 27, a ring torque motor 26, a large ring gear 33, a small ring gear 34 and a sliding wire torsion bar 11 in a planetary gear pair, and the sliding wire torsion bar 11 is provided with a hollow primary ball screw 10, a secondary ball screw 9, a tertiary ball screw 8, a quaternary ball screw 7 and a fifth-stage outer tube 2 which are sequentially mounted from the inside to the outside and matched in pairs through a screw nut pair, and the fifth-stage outer tube 2 is sequentially mounted from the inside to the outside with a fourth-stage outer tube 3, a third-stage outer tube 4 which can slide mutually in the axial direction. , a secondary outer tube 5, a primary outer tube 6, an end of the secondary outer tube 5 close to the driving end is rigidly connected to an end of the secondary ball screw 9 close to the driving end, and an end of the primary outer tube 6, the tertiary outer tube 4, and the quaternary outer tube 3 close to the driving end are concentrically rotatably connected to the primary ball screw 10, the tertiary ball screw 8, and the quaternary ball screw 7 respectively, and the primary ball screw 10, the tertiary ball screw 8 and the quaternary ball screw 7 can be connected to each other axially and are driven to rotate synchronously through the sliding wire torsion bar 11.

[0031] Specifically, an upper interface 1 is set at the end of the five-stage outer tube 2 away from the driving end as a pressure contact point, and a lower interface 19 is set at the end of the five-stage outer tube 2 close to the driving end as a tension contact point. A screw support bearing 18 is set at the driving end of the slide wire torsion bar 11 as a supporting fulcrum. When performing the jacking action, the small ring gear 34, the large ring gear 33 and the slide wire torsion bar 11 in the planetary gear pair are driven to rotate by the annular torque motor 26, and the slide wire torsion bar 11 drives the primary ball screw 10 to rotate. The primary ball screw 10 drives the secondary ball screw 9 to rise through the screw nut pair between the primary ball screw 10 and the secondary ball screw 9, thereby driving the secondary outer tube 5 to slide axially and extend relative to the primary outer tube 6. At the same time, the tertiary ball screw 8 and the first The third-level ball screw 10 rotates synchronously, and because the third-level ball screw 8 and the second-level ball screw 9 are also matched through the screw nut pair, the third-level ball screw 8 also rises relative to the second-level ball screw 9, thereby driving the third-level outer tube 4 to slide axially and extend relative to the second-level outer tube 5; while the third-level ball screw 8 rotates, it drives the fourth-level ball screw 7 to rise through the screw nut pair between it and the fourth-level ball screw 7, thereby driving the fourth-level outer tube 3 to slide axially and extend relative to the third-level outer tube 4, and the fourth-level ball screw 7 also rotates synchronously with the third-level ball screw 8 while rising, thereby driving the fifth-level outer tube 2 to slide axially and extend relative to the fourth-level outer tube 3 through the screw nut pair between it and the fifth-level outer tube 2, thereby achieving the lifting and support of the target. When it is necessary to retract the electric cylinder, the circular torque motor 26 drives the sliding wire torsion bar 11 to reverse, and each component begins to move in the opposite direction to achieve the contraction of the electric cylinder.

[0032] By connecting the primary ball screw 10, the tertiary ball screw 8 and the quaternary ball screw 7 so that they can slide axially with each other and drive them to rotate synchronously through the sliding wire torsion bar 11, the primary outer tube 6 and the primary ball screw 10, the tertiary outer tube 4 and the tertiary ball screw 8, and the quaternary outer tube 3 and the quaternary ball screw 7 are arranged in a form of concentric rotatable connection, and the secondary ball screw 9 and the primary outer tube 6, the secondary outer tube 5, the tertiary outer tube 4, the quaternary outer tube 3, and the fifth outer tube 2 do not rotate during operation, so that the rotation from one to another can be realized. The synchronous extension or retraction of the five-section cylinder body from the first-stage outer tube 6 to the second-stage outer tube 5, the third-stage outer tube 4, the fourth-stage outer tube 3, and the fifth-stage outer tube 2 realizes the lifting of the target and the retraction of the electric cylinder. Compared with the traditional two-section electric cylinder, three-section electric cylinder and four-section electric cylinder, it can achieve a larger deployment and folding ratio. Under the same folding length, the deployment stroke is longer and a larger lifting height can be achieved, which is more suitable for working scenarios with small installation space, large vertical angle and need of large deployment and folding ratio, such as vehicle-mounted equipment.

[0033] refer to Figure 1 , Figure 5 , Figure 6 , Figure 7In one embodiment, the implementation structure of the first-stage ball screw 10, the third-stage ball screw 8 and the fourth-stage ball screw 7 that can axially slide with each other and rotate synchronously is as follows: a first ball sliding key 25 is provided on the outer periphery of the sliding wire torsion bar 11, a second ball sliding key 28 is provided in the middle, and a third ball sliding key 29 is provided at the end away from the driving end. The first ball sliding key 25, the second ball sliding key 28, and the third ball sliding key 29 are respectively axially slidably connected to the first-stage ball screw 10, the third-stage ball screw 8, and the fourth-stage ball screw 7, and the distance between the second ball sliding key 28 and the end face of the first-stage ball screw 10 away from the driving end is greater than the maximum stroke of the second-stage ball screw 9 moving along the first-stage ball screw 10.

[0034] Specifically, a first sliding groove cooperating with the first ball sliding key 25 can be set on the inner wall of the first-stage ball screw 10, so that the first-stage ball screw 10 can be driven to rotate by the sliding wire torsion bar 11; a second sliding groove cooperating with the second ball sliding key 28 can be set on the inner wall of the third-stage ball screw 8, so that the third-stage ball screw 8 can be driven to rotate by the sliding wire torsion bar 11, and at the same time, the second ball sliding key 28 slides relatively in the second sliding groove to realize the extension and retraction of the third-stage ball screw 8. Since the distance between the second ball sliding key 28 and the end face of the first-stage ball screw 10 away from the driving end is greater than the maximum stroke of the second-stage ball screw 9 along the first-stage ball screw 10, sufficient space is provided for the extension and retraction of the second-stage ball screw 9, thereby not affecting the expansion length of the electric cylinder. At the same time, a third sliding groove matched with the third ball sliding key 29 is arranged on the inner wall of the fourth-stage ball screw 7. Through the cooperation between the third ball sliding key 29 and the third sliding groove, the third-stage ball screw 8 can drive the fourth-stage ball screw 7 to rotate synchronously, thereby realizing the extension and retraction of the fifth-stage outer tube 2. In addition, by arranging the first ball sliding key 25, the second ball sliding key 28 and the third ball sliding key 29 to be supported inside the first-stage ball screw 10, the third-stage ball screw 8 and the fourth-stage ball screw 7 respectively, the working state of the three hollow ball screws is also made more stable, and the structural strength is higher, so that a larger tonnage thrust can be achieved.

[0035] In this embodiment, the first ball sliding key 25, the second ball sliding key 28 and the third ball sliding key 29 integrated on the slide wire torsion bar 11 drive the first-stage ball screw 10, the third-stage ball screw 8, and the fourth-stage ball screw 7 to rotate, while the second-stage ball screw 9 does not rotate. Therefore, if the number of ball screw stages is increased, only the second-stage ball screw will not rotate, while the other ball screws will rotate. At the same time, a corresponding number of sliding keys must be integrated on the slide wire torsion bar 11. There are certain difficulties and risks in processing parts with multiple features, and multi-stage sliding keys cannot guarantee reliable assembly. Therefore, this principle is no longer applicable to electric cylinders with more stages.

[0036] refer to Figure 1In one embodiment, the end of the secondary ball screw 9 close to the driving end is provided with a primary ball screw nut cooperating with the primary ball screw 10, the end of the tertiary ball screw 8 close to the driving end is provided with a secondary ball screw nut cooperating with the secondary ball screw 9, the end of the fourth-stage ball screw 7 close to the driving end is provided with a third-stage ball screw nut 15 cooperating with the third-stage ball screw 8, and the end of the fifth-stage outer tube 2 close to the driving end is provided with a fourth-stage ball screw nut 36 cooperating with the fourth-stage ball screw 7. Since the primary ball screw 10, the secondary ball screw 9, the tertiary ball screw 8, the fourth ball screw 7 and the fifth outer tube 2 are arranged from the inside to the outside, and the primary ball screw nut, the secondary ball screw nut, the tertiary ball screw nut 15 and the fourth ball screw nut 36 are respectively matched with the primary ball screw 10, the secondary ball screw 9, the tertiary ball screw 8 and the fourth ball screw 7 to form four pairs of screw nut pairs, while realizing the action of the five-stage electric cylinder, it also makes the integration higher and the structure more compact, so as to achieve a smaller size and lighter weight under the same jacking requirements.

[0037] In one embodiment, the primary outer tube 6 is connected to the primary ball screw 10 via a primary bearing 17, the tertiary outer tube 4 is connected to the tertiary ball screw 8 via a tertiary bearing 16, the tertiary ball screw nut 15 is connected to the tertiary ball screw 7 via a tertiary bearing 14, and the tertiary outer tube 3 is rigidly connected to the tertiary ball screw nut 15. Through the primary bearing 17, the tertiary bearing 16, and the tertiary bearing 14, the primary outer tube 6 and the primary ball screw 10, the tertiary outer tube 4 and the tertiary ball screw 8, and the tertiary outer tube 3 and the tertiary ball screw 7 can coaxially rotate with each other, which is easy to achieve, and the bearing selection space is large, which can achieve a larger load.

[0038] Moreover, as the number of stages increases, the diameter of the screw increases. The integrated design of the existing inner nut and outer screw will greatly increase the difficulty of processing and heat treatment, and the deformation is large, which may cause the screw to get stuck. Specifically in this embodiment, the first and second screws are still integrated because of their small outer diameters, and the nut of the previous level is integrated on the next screw, that is, the first-level ball screw nut and the second-level ball screw nut are respectively integrated into the second-level ball screw 9 and the third-level ball screw 8; and the third and fourth-level screws are too large in size. If the integrated design is continued to be used, high requirements are placed on the processing equipment, the heat treatment is difficult, and the deformation is large. The large shape may easily cause the screw to get stuck. Therefore, the three- and four-stage screw pairs separate the nuts, that is, the three-stage ball screw nut 15 and the four-stage ball screw nut 36 are independently arranged, wherein the three-stage ball screw nut 15 is slidingly connected to the four-stage ball screw 7 through the four-stage bearing 14, and the four-stage ball screw nut 36 is directly connected to the five-stage outer tube 2, and is not rigidly connected to the screw, forming an independent structure in which the nut and the screw are separated, which greatly reduces the difficulty of processing and heat treatment, reduces the deformation, and can effectively prevent the screw from getting stuck, thereby eliminating the defects of the prior art.

[0039] In one embodiment, in order to make the axial sliding between the outer tubes more stable, mutually matching guide grooves and sliding wire guide keys 12 are provided between the first-level outer tube 6 and the second-level outer tube 5, between the second-level outer tube 5 and the third-level outer tube 4, between the third-level outer tube 4 and the fourth-level outer tube 3, and between the fourth-level outer tube 3 and the fifth-level outer tube 2.

[0040] refer to Figure 5 , Figure 6 , Figure 7 In one embodiment, the first ball sliding key 25, the second ball sliding key 28, and the third ball sliding key 29 on the outer periphery of the sliding wire torsion bar 11 are respectively composed of an arc groove, a ball return device and a steel ball on the sliding wire torsion bar 11. Correspondingly, the first ball sliding key 25 includes a first ball return device 37 and a steel ball, the second ball sliding key 28 includes a second ball return device 38 and a steel ball, and the third ball sliding key 29 includes a third ball return device 39 and a steel ball. The traditional sliding surface contact is changed to a sliding point contact. The ball guide key 12 between the first-level outer tube 6 and the second-level outer tube 5, the second-level outer tube 5 and the third-level outer tube 4, the third-level outer tube 4 and the fourth-level outer tube 3, and the fourth-level outer tube 3 and the fifth-level outer tube 2 has steel balls embedded in the sliding surfaces on both sides, and the steel balls slide up and down in the guide groove in a point contact manner, such as Figure 8 , Fig. 9 As shown. Changing the traditional sliding surface contact to sliding point contact greatly reduces the friction between the components and improves the working efficiency of the entire electric cylinder.

[0041] refer to Figure 1 and Figure 3In one embodiment, it also includes a large ring gear 33 and a small ring gear 34 in a planetary gear pair. The small ring gear 34 in the planetary gear pair drives the large ring gear 33 to drive the primary ball wire to rotate. The small ring gear 34 is engaged with the inner ring gear 21 integrated on the moving coil of the annular torque motor. The design of the planetary gear pair increases the rotation speed of the screw and realizes high-speed operation of the electric cylinder.

[0042] Furthermore, the annular torque motor includes a motor fixed ring 24 and a motor moving ring 22, the motor fixed ring 24 is rigidly connected to the housing 20, a second rolling bearing 32 is provided between the motor moving ring 24 and the primary outer tube 6, a first rolling bearing 23 is provided between the motor fixed ring 24 and the motor moving ring 22, an inner gear ring 21 integrated on the inner wall of the motor moving ring 22 is meshed with a small gear ring 34 in the planetary gear pair, and a large braking torque annular brake 27 is also provided at the tail of the annular torque motor 26, which wraps the electric cylinder structure well. The radial and axial dimensions of the electric cylinder are much smaller than those of traditional electric cylinders, which solves the problem of narrow space well.

[0043] The above is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a technician familiar with the field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. An ultra-heavy-load, high-efficiency, direct-drive five-section electric cylinder, comprising a ring brake (27), a ring torque motor (26), a large ring gear (33), a small ring gear (34) in a planetary gear pair, and a sliding wire torsion bar (11) driven by the ring torque motor (26) and the planetary gear pair at the driving end, characterized in that: The sliding wire torsion rod (11) is provided with a hollow primary ball screw (10), a secondary ball screw (9), a tertiary ball screw (8), a quaternary ball screw (7) and a fifth-stage outer tube (2) which are sequentially mounted from the inside to the outside and matched in pairs through a screw nut pair; the fifth-stage outer tube (2) is sequentially mounted from the inside to the outside with a fourth-stage outer tube (3), a tertiary outer tube (4), a secondary outer tube (5) and a primary outer tube (6) which can slide relative to each other in the axial direction; one end of the secondary outer tube (5) close to the driving end is connected to the The second-stage ball screw (9) is rigidly connected at one end close to the driving end, and the first-stage outer tube (6), the third-stage outer tube (4), and the fourth-stage outer tube (3) are respectively rotatably connected concentrically with the first-stage ball screw (10), the third-stage ball screw (8), and the fourth-stage ball screw (7) at one end close to the driving end. The first-stage ball screw (10), the third-stage ball screw (8), and the fourth-stage ball screw (7) are connected to each other axially and slidingly and are driven to rotate synchronously through the sliding wire torsion rod (11).

2. The ultra-heavy-load high-efficiency direct-drive five-section electric cylinder according to claim 1 is characterized in that: The sliding wire torsion rod (11) is provided with a first ball sliding key (25) on its periphery, a second ball sliding key (28) in its middle, and a third ball sliding key (29) at the end away from the driving end. The first ball sliding key (25), the second ball sliding key (28), and the third ball sliding key (29) are respectively axially slidably connected to the first-stage ball screw (10), the third-stage ball screw (8), and the fourth-stage ball screw (7). The distance between the second ball sliding key (28) and the end face of the first-stage ball screw (10) away from the driving end is greater than the maximum stroke of the second-stage ball screw (9) moving along the first-stage ball screw (10).

3. The ultra-heavy-load high-efficiency direct-drive five-section electric cylinder according to claim 2 is characterized in that: The first ball sliding key (25), the second ball sliding key (28) and the third ball sliding key (29) on the outer periphery of the sliding wire torsion bar (11) are respectively composed of an arc groove, a ball return device and a steel ball on the sliding wire torsion bar (11); correspondingly, the first ball sliding key (25) includes a first ball return device (37) and a steel ball, the second ball sliding key (28) includes a second ball return device (38) and a steel ball, and the third ball sliding key (29) includes a third ball return device (39) and a steel ball.

4. The ultra-heavy-load high-efficiency direct-drive five-section electric cylinder according to claim 1 is characterized in that: The end of the secondary ball screw (9) close to the driving end is provided with a primary ball screw nut cooperating with the primary ball screw (10); the end of the tertiary ball screw (8) close to the driving end is provided with a secondary ball screw nut cooperating with the secondary ball screw (9); the end of the fourth-stage ball screw (7) close to the driving end is provided with a third-stage ball screw nut (15) cooperating with the third-stage ball screw (8); and the end of the fifth-stage outer tube (2) close to the driving end is provided with a fourth-stage ball screw nut (36) cooperating with the fourth-stage ball screw (7).

5. The ultra-heavy-load high-efficiency direct-drive five-section electric cylinder according to claim 4 is characterized in that: The first-stage outer tube (6) is connected to the first-stage ball screw (10) via a first-stage bearing (17); one end of the second-stage outer tube (5) close to the driving end is rigidly connected to one end of the second-stage ball screw (9) close to the driving end; the third-stage outer tube (4) is connected to the third-stage ball screw (8) via a third-stage bearing (16); the third-stage ball screw nut (15) is connected to the fourth-stage ball screw (7) via a fourth-stage bearing (14); the fourth-stage outer tube (3) is rigidly connected to the third-stage ball screw nut (15); and the fifth-stage outer tube (2) is connected to the fourth-stage ball screw (7) via a fifth-stage bearing (13).

6. The ultra-heavy-load high-efficiency direct-drive five-section electric cylinder according to claim 1 is characterized in that: Mutually matching guide grooves and sliding guide keys (12) are provided between the first-level outer tube (6) and the second-level outer tube (5), between the second-level outer tube (5) and the third-level outer tube (4), between the third-level outer tube (4) and the fourth-level outer tube (3), and between the fourth-level outer tube (3) and the fifth-level outer tube (2).

7. The ultra-heavy-load high-efficiency direct-drive five-section electric cylinder according to claim 6 is characterized in that: The sliding surfaces on both sides of the sliding guide key (12) are inlaid with steel balls, which slide up and down in the guide groove in a point contact manner and restrict the rotation between the parts.

8. The ultra-heavy-load high-efficiency direct-drive five-section electric cylinder according to claim 1 is characterized in that: The annular torque motor (26) comprises a motor fixed ring (24) and a motor moving ring (22); the motor fixed ring (24) is rigidly connected to a housing (20); a second rolling bearing (32) is provided between the motor moving ring (22) and a primary outer tube (6); a first rolling bearing (23) is provided between the motor fixed ring (24) and the motor moving ring (22); and an annular brake (27) with a large braking torque is also provided at the tail of the annular torque motor (26).

9. The ultra-heavy-load high-efficiency direct-drive five-section electric cylinder according to claim 8, characterized in that: The primary ball screw (10) is integrated with a large ring gear (33) in a planetary gear pair, and a small ring gear (34) is axially fixed to the housing (20) through a gear support bearing (35) for self-rotation. The internal ring gear (21) integrated on the inner wall of the motor moving coil (22) meshes with the small ring gear (34) in the planetary gear pair, and then drives the primary ball screw (10) to rotate through the large ring gear (33) in the planetary gear pair.

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