A multi-connected electric push rod structure

Abstract

The present invention relates to a multi-link electric push rod structure, comprising an active push rod unit, a driven electric push rod arranged on both sides of the active push rod unit, a driving member driving the active push rod unit to extend and retract, and a linkage member connecting the active push rod unit and the driven push rod unit so that the active push rod unit and the driven push rod unit work synchronously, the active push rod unit and the driven push rod unit both comprise a base, an outer tube, an inner tube, a screw and a nut, the screw is rotatably connected to the base, one end of the outer tube is fixed to the base and sleeved outside the screw, the inner tube is penetrated in the outer tube and sleeved outside the screw, the nut is arranged at one end of the inner tube facing the base and is threadedly connected with the screw, the inner tube and the outer tube are clamped in the rotation direction along the axis, and the driving member is arranged on the base in the active push rod unit and connected with the screw to drive the screw to rotate. The present invention can make the push-out and retraction synchronization of each electric push rod better.

Description

Technical Field

[0001] The present invention relates to the technical field of electric push rods, and in particular to a multi-connected electric push rod structure. Background Art

[0002] Electric push rod, also known as linear drive, is a new type of linear actuator mainly composed of motor push rod and control device. Electric push rod includes base, outer tube, inner tube, screw, nut and drive motor. The screw is rotatably connected to the base. One end of the outer tube is fixed to the base and sleeved outside the screw. The inner tube is inserted into the outer tube and sleeved outside the screw. The nut is arranged at one end of the inner tube facing the base and is threadedly connected with the screw. The inner tube and the outer tube are clamped in the direction of rotation along the axis. The drive motor is arranged on the base and connected with the screw to drive the screw to rotate. When the screw rotates, the inner tube and the nut are close to or away from the base along the axial direction of the screw, thereby realizing the functions of pushing out and pulling back.

[0003] The driving force of the electric push rod acts on the connection point at the top of the push rod. When the object to be driven is long, using a single electric push rod will not only result in insufficient driving force, but also cause the driving force to act on the connection point, which is unbalanced and leads to poor driving effect. The method to deal with the above problems in the prior art is to install multiple electric push rods distributed along the length direction of the object, and the tops of the push rods of the multiple electric push rods are linearly distributed in the length direction of the object, so as to have better driving force and more balanced force.

[0004] The above-mentioned prior art solutions have the following defects: since each electric push rod is driven by its own drive motor, a controller is required to synchronize the drive motors, which is costly and there are still errors in the synchronization effect, causing the push-out and retraction of each electric push rod to be out of sync, resulting in damage to the connection between the electric push rod and the driven object. Summary of the invention

[0005] In view of the shortcomings of the prior art, one of the purposes of the present invention is to provide a multi-connected electric push rod structure, which can make the push-out and retraction of each electric push rod more synchronized.

[0006] The above-mentioned inventive object of the present invention is achieved through the following technical scheme: a multi-link electric push rod structure, including an active push rod unit, a driven push rod unit arranged on both sides of the active push rod unit, a driving member for driving the active push rod unit to extend and retract, and a linkage member connecting the active push rod unit and the driven push rod unit so that the active push rod unit and the driven push rod unit work synchronously. The active push rod unit and the driven push rod unit both include a base, an outer tube, an inner tube, a screw and a nut. The screw is rotatably connected to the base, one end of the outer tube is fixed to the base and sleeved on the outside of the screw, the inner tube is passed through the outer tube and sleeved on the outside of the screw, the nut is arranged at one end of the inner tube facing the base and is threadedly connected to the screw, the inner tube and the outer tube are clamped in the rotation direction along the axis, and the driving member is arranged on the base in the active push rod unit and is connected to the screw to drive the screw to rotate.

[0007] By adopting the above technical solution, when in use, the active push rod unit is driven to operate by the driving member, and the driven push rod units located on both sides of the active push rod unit are driven to operate by the linkage member. There is only one driving member, so that multiple push rods can be extended and retracted synchronously, avoiding the problem of poor synchronization between multiple driving members.

[0008] In a preferred example, the present invention can be further configured as follows: the driving member includes a driving motor, a reduction gear set, a first bevel gear, a second bevel gear and a third bevel gear; the driving motor is arranged on a base and the output shaft is connected to the input shaft of the reduction gear set; the first bevel gear is connected to the output shaft of the reduction gear set; the second bevel gear is perpendicular to the first bevel gear and meshes with each other; the second bevel gear is rotatably mounted on the base; the third bevel gear is perpendicular to the second bevel gear and meshes with each other; and the third bevel gear is fixedly connected to the screw.

[0009] By adopting the above technical solution, the driving mechanism uses a driving motor to reduce speed through a reduction gear set and drive the first bevel gear to rotate, and then through the second bevel gear and the third bevel gear that are vertical and meshed in sequence, the second bevel gear drives the linkage to operate, thereby driving the screw of the driven push rod unit to rotate, and the third bevel gear directly drives the screw to rotate, thereby realizing the synchronous extension and retraction of the screw of the active push rod unit and the screw of the driven push rod unit.

[0010] In a preferred example, the present invention can be further configured as follows: the linkage member includes a linkage shaft arranged on both sides of the base, and a connecting sleeve connecting the linkage shaft between adjacent push rod units, and the linkage shaft is coaxially connected to the second bevel tooth in the push rod unit.

[0011] By adopting the above technical solution, the second bevel tooth of the active push rod unit rotates to drive the linkage shaft to rotate, and then drives the linkage shaft in the adjacent driven push rod unit to rotate through the connecting sleeve. The linkage shaft in the driven push rod unit drives the second bevel tooth in the driven push rod unit to rotate, and drives the third bevel tooth meshing with the second bevel tooth to rotate, thereby driving the screw in the driven push rod unit to rotate.

[0012] In a preferred example, the present invention can be further configured as follows: the connecting sleeve and the linkage shafts at both ends of the connecting sleeve are key-connected.

[0013] By adopting the above technical solution, the key connection structure is simple and convenient for production, processing and assembly.

[0014] In a preferred example, the present invention can be further configured as follows: the base includes a special-shaped tube seat, an upper cover and an upper cover from top to bottom, the special-shaped tube seat and the upper cover are connected by a first fixing bolt, the upper cover and the upper cover are connected by a second fixing bolt, a transmission cavity is formed between the upper cover and the upper cover, the first bevel gear, the second bevel gear and the third bevel gear are all installed in the transmission cavity, a transmission shaft is rotatably installed in the transmission cavity, the second bevel gear is coaxially fixed on the transmission shaft, and both ends of the transmission shaft are coaxially connected to two linkage shafts of the push rod unit.

[0015] By adopting the above technical solution, the special-shaped pipe seat, the upper cover and the upper cover are fixedly installed and guided by the first fixing bolt, and the upper cover and the upper cover are fixedly installed by the second fixing bolt. The first bevel gear, the second bevel gear and the third bevel gear are all installed in the transmission cavity, so that the structural layout is more reasonable; the transmission shaft crosses the transmission cavity and is connected to the transmission shaft to transmit power to the linkage shafts on both sides.

[0016] In a preferred example, the present invention can be further configured as follows: the reduction gear group includes an input gear, a first gear, a second gear, a third gear, a fourth gear and an output gear, the input gear is coaxially connected to the output shaft of the drive motor, the first gear and the second gear are coaxially arranged, the second gear is located below the first gear, the third gear and the fourth gear are coaxially arranged, the third gear is located below the fourth gear, the input gear is meshed with the first gear, the second gear is meshed with the third gear, the fourth gear is meshed with the output gear, and the output gear is coaxially connected to the first bevel tooth of the screw.

[0017] By adopting the above technical solution, the first gear and the second gear are staggered in height, and the third gear and the fourth gear are staggered in height, which reduces the required installation space. The specific reduction ratio can be changed by changing the number of teeth of the input gear, the first gear, the second gear, the third gear, the fourth gear and the output gear, and the range of the reduction ratio is large after multiple gears are meshed and transmitted.

[0018] In a preferred example, the present invention can be further configured as follows: a lower cover is provided on the bottom surface of the base of the active push rod unit, a speed change cavity is formed between the lower cover and the bottom surface of the base, and the reduction gear set is provided in the speed change cavity.

[0019] By adopting the above technical solution, the reduction gear set is installed in the speed change cavity, the reduction gear set is closer to the drive motor and the output gear, and the transmission distance is short; and the reduction gear set is covered by the lower cover to prevent the reduction gear set from dust accumulation and damage due to external factors.

[0020] In a preferred example, the present invention can be further configured as follows: a transmission hole is provided on the base for the linkage shaft to extend into the transmission cavity, a circular protrusion is provided at the hole mouth, and a reinforcing sleeve is provided on the outer sleeve of the protrusion.

[0021] By adopting the above technical solution, the reinforcing sleeve is sleeved outside the protrusion, and the structure of the protrusion is protected and reinforced during operation, thereby reducing damage to the protrusion.

[0022] In a preferred example, the present invention can be further configured as follows: threads are provided on the protrusions, and end caps are threadedly connected to the two protrusions located at the outermost sides along the distribution direction of the push rod units.

[0023] By adopting the above technical solution, the two linkage shafts located at the outermost position are exposed to the outside. By threading the end caps on the protrusions, the ends of the linkage shafts are covered so that the ends of the linkage shafts are no longer exposed, preventing dust and the like from entering the interior of the protrusions and also preventing rust to a certain extent.

[0024] In a preferred example, the present invention can be further configured as follows: an upper end joint is provided at the end of the inner tube extending out of the outer tube.

[0025] By adopting the above technical solution, the upper end joint is used to connect with the target object to be pushed. When in use, the screw rotates to drive the inner tube to expand and contract. When the inner tube expands and contracts, it drives the upper end joint to move, thereby driving the target object connected to the upper end joint to move.

[0026] In summary, the present invention includes at least one of the following beneficial technical effects:

[0027] 1. The active push rod unit is driven by the driving member, and the driven push rod units on both sides of the active push rod unit are driven by the linkage member. There is only one driving member, so that multiple push rods can be extended and retracted synchronously, avoiding the problem of poor synchronization between multiple driving members;

[0028] 2. The driving mechanism uses a driving motor to reduce speed through a reduction gear set and drive the first bevel gear to rotate, and then through the second bevel gear and the third bevel gear that are vertical and meshed in sequence, the second bevel gear drives the linkage to operate, thereby driving the screw of the driven push rod unit to rotate, and the third bevel gear directly drives the screw to rotate, so as to achieve synchronous extension and retraction of the screw of the active push rod unit and the screw of the driven push rod unit;

[0029] 3. The first gear and the second gear are staggered in height, and the third gear and the fourth gear are staggered in height, which reduces the required installation space. The specific reduction ratio can be changed by changing the number of teeth of the input gear, the first gear, the second gear, the third gear, the fourth gear and the output gear, and the range of the reduction ratio is large after multiple gears are meshed and transmitted. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of a multi-connected electric push rod structure in this embodiment.

[0031] Figure 2 It is a cross-sectional view of a multi-connected electric push rod structure in this embodiment.

[0032] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0033] Figure 4 yes Figure 2 Enlarged view of point B

[0034] Figure 5 It is an exploded schematic diagram of a multi-connected electric push rod structure in this embodiment.

[0035] 1. the upper cover; 2. the lower cover; 3. the upper cover; 4. the lower cover; 5. the first fixing bolt hole; 6. the driving member; 7. the driving motor; 8. the first bevel gear; 9. the second bevel gear; 10. the third bevel gear; 11. the lower cover; 12. the lower cover; 13. the upper cover; 14. the lower cover; 15. the first fixing bolt hole; 16. the driving member; 17. the driving motor; 18. the first bevel gear; 19. the second bevel gear; 20. the third bevel gear; 21. the lower cover; 22. the upper cover; 23. the upper cover; 24. the lower cover; 25. the first fixing bolt hole; 26. the driving member; 27. the driving motor; 28. the first bevel gear; 29. ​​the second bevel gear; 30. the third bevel gear; 31. the lower cover; 32. the first bevel gear; 33. the second bevel gear; 34. the third bevel gear; 35. the third bevel gear; 36. the lower cover; 37. the lower cover; 38. the lower cover; 39. the lower cover; 40. the lower cover; 41. the linkage member; 42. the linkage shaft; 43. the connecting sleeve; 44. the protrusion; 45. the reinforcing sleeve; 51. the input gear; 52. the first gear; 53. the second gear; 54. the third gear; 55. the fourth gear; 56. the output gear; 71. the outer tube; 72. the inner tube; 721. the upper end joint; 73. the screw rod; 74. the nut; 81. the speed change chamber; 82. the transmission chamber; 83. the transmission shaft. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0037] Reference Figure 1 , which is a multi-connected electric push rod structure disclosed in the present invention, includes an active push rod unit 11, two driven push rod units 12 respectively located on both sides of the active push rod unit 11, a driving member 3, and a linkage member 4 connecting the active push rod unit 11 and the driven push rod unit 12 so that the two can be extended and retracted synchronously.

[0038] like Figure 1 and Figure 2As shown, the driving member 3 includes a driving motor 31 , a reduction gear set, a first bevel gear 32 , a second bevel gear 33 and a third bevel gear 34 .

[0039] like Figure 1 and Figure 3 As shown, the active push rod unit 11 and the driven push rod unit 12 both include a base 2 , an outer tube 71 , an inner tube 72 , a screw rod 73 and a nut 74 .

[0040] like Figure 1 and Figure 4 As shown, the base 2 includes a special-shaped pipe base 21, an upper cover 22 and an upper cover 23 which are arranged in sequence from top to bottom.

[0041] like Figure 4 and Figure 5 As shown, the bottom surface of the upper cover 23 facing away from the upper cover 22 is fixed with the lower cover 24 by the second fixing bolt, and a transmission chamber 81 is formed between the lower cover 24 and the upper cover 23, and the upper cover 23 and the upper cover 22 are both provided with a first fixing bolt hole 25, and the first fixing bolt hole 25 of the upper cover 23 is coaxially arranged with the corresponding first fixing bolt hole 25 on the upper cover 22, and a fixing screw hole is provided on the surface of the special-shaped pipe seat 21 facing the upper cover 22, and a first fixing bolt is passed through the first fixing bolt hole 25 of the upper cover 23, and the bottom of the first fixing bolt passes through the first fixing bolt hole 25 on the upper cover 22 and is threadedly connected with the fixing screw hole, so that the special-shaped pipe seat 21, the upper cover 22 and the upper cover 23 are fixed together, and a transmission chamber 82 is formed between the upper cover 23 and the upper cover 22.

[0042] like Figure 2 and Figure 4 As shown, the screw rod 73 is rotatably connected to the special-shaped pipe seat 21 through a bearing, the bottom end of the screw rod 73 penetrates the upper cover 22 and extends into the transmission cavity 82 and is fixedly connected to the third bevel gear 34, the third bevel gear 34 is horizontally arranged, and a transmission shaft 83 horizontally arranged along the distribution direction of the active push rod unit 11 and the driven push rod unit 12 is rotatably connected in the transmission cavity 82, the second bevel gear 33 is fixedly connected to the transmission shaft 83 and is vertically arranged, and the second bevel gear 33 is meshed with the third bevel gear 34.

[0043] like Figure 3 As shown, the outer tube 71 is fixed on the special-shaped tube seat 21, the inner tube 72 is inserted into the outer tube 71 and sleeved on the outside of the screw 73, the nut 74 is threadedly connected to the screw 73, the end of the inner tube 72 close to the special-shaped tube seat 21 is threadedly connected to the nut 74, and the rotation direction of the thread is opposite to the thread direction of the screw 73 and the nut 74, and the end of the inner tube 72 away from the nut 74 extends out of the outer tube 71 and is fixedly connected to the upper end joint 721.

[0044] like Figure 4 and Figure 5As shown, the reduction gear group includes an input gear 51, a first gear 52, a second gear 53, a third gear 54, a fourth gear 55 and an output gear 56. The output gear 56 is rotatably mounted on the upper cover 23 through the output gear 56 shaft and is located in the speed change chamber 81. A mounting plate 231 is integrally provided on one side of the upper cover 23. The drive motor 31 is mounted on the mounting plate 231 and is arranged vertically downward. The output shaft of the drive motor 31 extends into the speed change chamber 81 and is fixedly connected to the input gear 51.

[0045] The first gear 52 and the second gear 53 are coaxially and horizontally rotatably installed in the speed change chamber 81, the second gear 53 is located below the first gear 52, the first gear 52 is meshed with the output shaft, the second gear 53 is meshed with the third gear 54, the third gear 54 and the fourth gear 55 are coaxially and horizontally rotatably installed in the speed change chamber 81, the fourth gear 55 is meshed with the output gear 56, the number of teeth of the input gear 51 is smaller than the number of teeth of the first gear 52, the number of teeth of the first gear 52 is greater than the number of teeth of the second gear 53, the number of teeth of the second gear 53 is smaller than the number of teeth of the third gear 54, the number of teeth of the third gear 54 is greater than the number of teeth of the fourth gear 55, and the number of teeth of the fourth gear 55 is smaller than the number of teeth of the output gear 56, thereby realizing multi-stage reduction transmission.

[0046] The output gear 56 is rotatably installed in the speed change chamber 81, and the rotating shaft of the output gear 56 passes upward through the upper cover 23 into the transmission chamber 82. The first bevel gear 32 is horizontally arranged and fixed on the part of the output gear 56 located in the transmission chamber 82, and the first bevel gear 32 is meshed with the second bevel gear 33.

[0047] like Figure 2 As shown, the linkage member 4 includes a linkage shaft 41 disposed on both sides of the base 2 and a connecting sleeve 42 connecting the linkage shafts 41 between adjacent push rod units.

[0048] Semicircular protrusions 43 are integrally provided on both sides of the upper cover 23 and the upper cover 22. The semicircular protrusions 43 on the upper cover 23 and the upper cover 22 are connected to form a complete circular ring. The linkage shaft 41 is fixedly connected to both ends of the transmission shaft 83 and extends out of the transmission cavity 82 after penetrating the protrusions 43. A reinforcing sleeve 44 is sleeved on the protrusion 43. The connecting sleeve 42 connects the linkage shaft 41 of the active push rod unit 11 and the linkage shaft 41 of the driven push rod unit 12, so that the linkage shafts 41 can rotate synchronously.

[0049] The implementation principle of this embodiment is:

[0050] When the driving motor 31 is working, the transmission shaft 83 and the third bevel gear 34 are driven to rotate after the reduction gear group is decelerated, the third bevel gear 34 drives the screw 73 to rotate, the transmission shaft 83 drives the linkage shaft 41 to rotate, thereby driving the transmission shaft 83 in the driven push rod unit 12 to rotate. The screw 73 is driven to rotate through the third bevel gear 34 in the driven push rod unit 12, so that the nut 74 drives the inner tube 72 to slide on the outer tube 71.

[0051] Since only one driving motor 31 is used to drive the three push rod units, as long as the transmission ratio between the driving motor 31 and the three third bevel teeth 34 is kept the same during the transmission process, the three push rod units can be extended and retracted synchronously.

[0052] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-connected electric push rod structure, characterized in that: The invention comprises an active push rod unit (11), a driven push rod unit (12) arranged on both sides of the active push rod unit (11), a driving member (3) for driving the active push rod unit (11) to extend and retract, and a linkage member (4) for connecting the active push rod unit (11) and the driven push rod unit (12) so that the active push rod unit (11) and the driven push rod unit (12) work synchronously. The active push rod unit (11) and the driven push rod unit (12) both comprise a base (2), an outer tube (71), an inner tube (72), a screw rod (73) and a nut (74). The screw rod (73) is rotatably connected to the On the base (2), one end of the outer tube (71) is fixed on the base (2) and sleeved on the outside of the screw rod (73), the inner tube (72) is inserted into the outer tube (71) and sleeved on the outside of the screw rod (73), the nut (74) is arranged at one end of the inner tube (72) facing the base (2) and is threadedly connected to the screw rod (73), the inner tube (72) and the outer tube (71) are clamped together along the axis in the rotation direction, and the driving member (3) is arranged on the base (2) in the active push rod unit (11) and is connected to the screw rod (73) of the active push rod unit (11) to drive the screw rod (73) of the active push rod unit (11) to rotate; The driving member (3) comprises a driving motor (31), a reduction gear set, a first bevel gear (32), a second bevel gear (33) and a third bevel gear (34); the driving motor (31) is arranged on the base (2) and the output shaft is connected to the input shaft of the reduction gear set; the first bevel gear (32) is connected to the output shaft of the reduction gear set; the second bevel gear (33) and the first bevel gear (32) are perpendicular to each other and mesh with each other; the second bevel gear (33) is rotatably mounted on the base (2); the third bevel gear (34) and the second bevel gear (33) are perpendicular to each other and mesh with each other; and the third bevel gear (34) is fixedly connected to the screw rod (73) of the active push rod unit (11); The linkage member (4) comprises a linkage shaft (41) arranged on both sides of a base (2) of an active push rod unit (11), and a connecting sleeve (42) connecting the linkage shafts (41) between adjacent push rod units, wherein the linkage shaft (41) is coaxially connected to the second bevel gear (33); The reduction gear set comprises an input gear (51), a first gear (52), a second gear (53), a third gear (54), a fourth gear (55) and an output gear (56); the input gear (51) is coaxially connected to an output shaft of a driving motor (31); the first gear (52) and the second gear (53) are coaxially arranged; the second gear (53) is located below the first gear (52); the third gear (54) and the fourth gear (55) are coaxially arranged; the third gear (54) is located below the fourth gear (55); the input gear (51) is meshed with the first gear (52); the second gear (53) is meshed with the third gear (54); the fourth gear (55) is meshed with the output gear (56); and the output gear (56) is coaxially connected to a screw rod (73) and a first bevel gear (32) of an active push rod unit (11).

2. The multi-connected electric push rod structure according to claim 1, characterized in that: The connecting sleeve (42) and the linkage shafts (41) at both ends of the connecting sleeve (42) are key-connected.

3. The multi-connected electric push rod structure according to claim 1, characterized in that: The base (2) comprises, from top to bottom, a special-shaped tube seat (21), an upper cover (22) and an upper cover (23); the special-shaped tube seat (21) and the upper cover (22) are connected via a first fixing bolt; the upper cover (22) and the upper cover (23) are connected via a second fixing bolt; a transmission cavity (82) is formed between the upper cover (22) and the upper cover (23); the first bevel gear (32), the second bevel gear (33) and the third bevel gear (34) are all installed in the transmission cavity (82); a transmission shaft (83) is rotatably installed in the transmission cavity (82); the second bevel gear (33) is coaxially fixed on the transmission shaft (83); and two ends of the transmission shaft (83) are coaxially connected to two linkage shafts (41) on both sides of the push rod unit.

4. The multi-connected electric push rod structure according to claim 1, characterized in that: A lower cover (24) is provided on the bottom surface of the base (2) of the active push rod unit (11), a speed change chamber (81) is formed between the lower cover (24) and the bottom surface of the base (2), and the reduction gear set is provided in the speed change chamber (81).

5. The multi-connected electric push rod structure according to claim 1, characterized in that: The base (2) is provided with a transmission hole for the linkage shaft (41) to extend into the transmission cavity (82), a circular protrusion (43) is provided at the opening of the transmission hole, and a reinforcement sleeve (44) is provided on the outer cover of the protrusion (43).

6. The multi-connected electric push rod structure according to claim 5, characterized in that: The protrusions (43) are provided with threads, and the two protrusions (43) located at the outermost sides along the distribution direction of the push rod units are threadedly connected with end caps.

7. The multi-connected electric push rod structure according to claim 1, characterized in that: An upper end joint (721) is provided at the end of the inner tube (72) extending out of the outer tube (71).

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