A manually maneuverable electric push rod

Abstract

A manually operable electric linear actuator includes a protective cover, a transmission mechanism and an electric actuator fixed to the protective cover, a manual adjustment component and a reduction gear set installed inside the protective cover. The transmission mechanism includes a screw, the lower end of which is connected to the manual adjustment component. The electric actuator has an output shaft at its output end. One end of the reduction gear set is connected to the screw, and the other end is connected to the output shaft. The manual adjustment component includes a first bevel gear, a second bevel gear, a bevel gear drive shaft, and a bevel gear shaft. The bevel gear drive shaft is located below the bevel gear shaft. The first bevel gear is fitted onto the bevel gear drive shaft, and the second bevel gear is fitted onto the bevel gear shaft. The first and second bevel gears mesh. The upper end of the bevel gear shaft is connected to the lower end of the screw. This invention, by incorporating a manual adjustment component, allows for adjustment of the transmission mechanism even in the event of a power outage, enabling the transmission mechanism to continue driving the relevant working mechanisms. This improves the convenience of using the electric linear actuator and its adaptability to various working conditions, making it highly practical.

Description

Technical Field

[0001] This utility model relates to the field of electric linear actuator technology, and in particular to a manually operable electric linear actuator. Background Technology

[0002] An electric linear actuator, also known as a linear actuator motor, electric cylinder, or linear actuator, is an electrically driven device that converts the rotary motion of an electric motor into the linear reciprocating motion of a linear actuator. The extension and retraction of the actuator are achieved by the forward and reverse rotation of the motor. It can be used as an actuator in various simple or complex processes to achieve remote, centralized, or automatic control. Due to its simple structure and other advantages, it has a wide range of applications, such as in electric lifting mechanisms for electric sofas and lifting beds, as well as in ventilation control, water inlet control, and feed control for doors and windows in automated farm sheds, and in temperature control for plant greenhouses.

[0003] Traditional electric linear actuators are controlled by motors. However, once the power is lost, for example, due to a motor or power supply circuit failure, the electric linear actuator cannot transmit power; that is, it cannot extend or retract, thus losing its original function and directly affecting the continuity and efficiency of production operations. Therefore, a manually operable electric linear actuator is needed to improve upon these problems. Utility Model Content

[0004] The purpose of this invention is to provide a manually operable electric linear actuator to solve the aforementioned technical problems. In the event of a power outage, the transmission mechanism can be manually adjusted so that it can continue to drive the relevant working mechanisms. This improves the convenience of using the electric linear actuator and its adaptability to various working conditions, making it highly practical.

[0005] To achieve the above objectives, this utility model employs the following technical solution:

[0006] A manually operable electric actuator includes a protective cover, a transmission mechanism and an electric device fixed on the protective cover, a manual adjustment assembly, a reduction gear set and a stroke adjustment assembly installed inside the protective cover;

[0007] The transmission mechanism includes a screw, the lower end of which is connected to a manual adjustment component;

[0008] The output end of the electric device is provided with an output shaft;

[0009] One end of the reduction gear set is connected to the screw, and the other end of the reduction gear set is connected to the output shaft;

[0010] The manual adjustment assembly includes a first bevel tooth, a second bevel tooth, a bevel tooth drive shaft, and a bevel tooth shaft. The bevel tooth drive shaft is located below the bevel tooth shaft. The first bevel tooth is sleeved on the bevel tooth drive shaft, and the second bevel tooth is sleeved on the bevel tooth shaft. The first bevel tooth and the second bevel tooth mesh with each other. The upper end of the bevel tooth shaft is connected to the lower end of the screw.

[0011] Furthermore, the manual adjustment assembly also includes a first bearing, a second bearing, a third bearing, and a bevel gear seat cover. The first and second bearings are both sleeved on the bevel gear drive shaft, and the third bearing is sleeved on the bevel gear shaft.

[0012] Furthermore, the manual adjustment assembly also includes a circlip with a hole, a first circlip for the shaft, and a second circlip for the shaft. The first circlip for the shaft is sleeved on the bevel gear drive shaft, the second circlip for the shaft is sleeved on the bevel gear shaft, and the circlip with the hole is mounted on a third bearing.

[0013] Furthermore, the reduction gear set includes a main gear and a helical gear set, the main gear is connected to the screw, and the helical gear set is located between the main gear and the output shaft.

[0014] Furthermore, the helical gear assembly includes a transmission gear, a large helical gear, and a large helical gear transmission shaft. The large helical gear transmission shaft passes through the middle of the transmission gear and the large helical gear. The transmission gear is located above the large helical gear. The transmission gear meshes with the main gear, and the large helical gear meshes with the output shaft.

[0015] Furthermore, the transmission mechanism also includes an inner tube, an outer tube, and a telescopic push rod. The inner tube is sleeved around the screw, and the upper end of the inner tube is connected to the telescopic push rod. The outer tube is sleeved around the inner tube and connected to the upper cover.

[0016] Furthermore, the transmission mechanism also includes a skeleton oil seal and a screw protective sleeve. The skeleton oil seal is disposed between the upper cover and the outer tube, and the screw protective sleeve is disposed on the screw and located between the bevel gear seat cover and the main gear.

[0017] Furthermore, two ball bearings are also fitted onto the screw, with the two ball bearings located on both sides of the main gear.

[0018] Furthermore, the protective cover includes an upper cover, a middle cover, and a bottom cover. The lower end of the upper cover is provided with an upper cover waterproof ring, the lower end of the middle cover is provided with a middle cover waterproof ring, the manual adjustment component is located inside the bottom cover, and adjustment through holes are provided on both sides of the bottom cover. Both ends of the bevel gear shaft are located inside the adjustment through holes.

[0019] Furthermore, the stroke adjustment assembly includes a stroke adjustment gear set, a potentiometer, a potentiometer gear, a cam adjustment set, a cam connecting gear, and a micro switch set. The potentiometer, potentiometer gear, cam adjustment set, and micro switch set are all installed inside the middle cover, and the stroke adjustment gear set and cam connecting gear are all installed inside the upper cover.

[0020] This practical, manually operable electric linear actuator has the following beneficial effects:

[0021] This practical, manually operable electric push rod allows for easy operation in the event of a power outage. An external tool, the wrench, can be inserted into the bottom cover via the adjustment hole. Operating the wrench allows for turning the bevel gear drive shaft. The meshing of the first and second bevel gears, along with the stable connection between the screw and the bevel gear shaft, drives the screw to rotate. The rotating screw then causes the mating nut and inner tube to slide back and forth along the central axis of the outer tube, thus achieving the telescopic movement of the push rod. The operation is stable, achieving the purpose of transmission adjustment and preventing disruption to production continuity and efficiency due to power outages. It is highly practical. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a structural breakdown diagram of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of this utility model without the bottom cover;

[0025] Figure 4 This is a schematic diagram of the screw, manual adjustment assembly, and reduction gear set of this utility model;

[0026] Figure 5 for Figure 4 The diagram shown is an enlarged view of the structure excluding the reduction gear set, ball bearings, and screw protective sleeve.

[0027] Figure 6 This is an enlarged structural diagram of the electric device, transmission mechanism, reduction gear set, manual adjustment component, and stroke adjustment component of this utility model. Figure 1 ;

[0028] Figure 7 This is an enlarged structural diagram of the electric device, transmission mechanism, reduction gear set, manual adjustment component, and stroke adjustment component of this utility model. Figure 2 .

[0029] The numbers on the map are:

[0030] 1. Protective cover; 2. Transmission mechanism; 3. Electric actuator; 4. Manual adjustment assembly; 5. Reduction gear set; 6. Stroke adjustment assembly; 7. Screw; 8. Output shaft; 9. First bevel gear; 10. Second bevel gear; 11. Bevel gear drive shaft; 12. Bevel gear shaft; 13. First bearing; 14. Second bearing; 15. Third bearing; 16. Bevel gear seat cover; 17. Hole retaining ring; 18. First shaft retaining ring; 19. Second shaft retaining ring; 20. Main gear; 21. Transmission gear; 22. Large helical gear; 23. Large helical gear drive shaft; 24. Inner... 25. Outer tube; 26. Telescopic push rod; 27. Skeleton oil seal; 28. Screw protective sleeve; 29. ​​Ball bearing; 30. Top cover; 31. Middle cover; 32. Bottom cover; 33. Top cover waterproof ring; 34. Middle cover waterproof ring; 35. Adjustment perforation; 36. Stroke adjustment gear set; 37. Potentiometer; 38. Potentiometer gear; 39. Cam adjustment set; 40. Cam connecting gear; 41. Micro switch set; 42. Small helical gear set; 43. Capacitor; 44. Circuit board; 45. Rotation adjustment part; 46. Signal line; 47. Power cord. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solution of this utility model, the product of this utility model will be further described in detail below with reference to the embodiments and accompanying drawings.

[0032] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] like Figure 1 , Figure 2 , Figure 4 and Figure 6 As shown, a manually operable electric actuator includes a protective cover 1, a transmission mechanism 2 and an electric device 3 fixed on the protective cover 1, a manual adjustment assembly 4 installed inside the protective cover 1, a reduction gear set 5 and a stroke adjustment assembly 6.

[0035] The transmission mechanism 2 includes a screw 7, the lower end of which is connected to the manual adjustment component 4;

[0036] The output end of the electric device 3 is provided with an output shaft 8;

[0037] One end of the reduction gear set 5 is connected to the screw 7, and the other end of the reduction gear set 5 is connected to the output shaft 8;

[0038] The manual adjustment assembly 4 includes a first bevel gear 9, a second bevel gear 10, a bevel gear drive shaft 11, and a bevel gear shaft 12. The bevel gear drive shaft 11 is located below the bevel gear shaft 12. The first bevel gear 9 is sleeved on the bevel gear drive shaft 11, and the second bevel gear 10 is sleeved on the bevel gear shaft 12. The first bevel gear 9 and the second bevel gear 10 mesh. The upper end of the bevel gear shaft 12 is connected to the lower end of the screw 7.

[0039] It should be noted that this utility model is equipped with a manual adjustment component 4. Through the cooperation between its first bevel gear 9, second bevel gear 10, bevel gear drive shaft 11, bevel gear shaft 12 and screw 7, in the event of a power failure, the bevel gear drive shaft 11 can be manually turned using external tools to adjust the transmission.

[0040] like Figure 2 , Figure 4 and Figure 5 As shown, the upper end of the bevel gear shaft 12 is provided with a polygonal insertion hole, and the lower end of the lead screw is provided with an insertion part. The insertion part is polygonal and is tightly inserted into the insertion hole.

[0041] It should be noted that when the electric device 3 is running, the manual adjustment component 4 also rotates synchronously. When the function of the manual adjustment component 4 is used, the output shaft 8 and the reduction gear set 5 of the electric device 3 also rotate synchronously.

[0042] like Figure 2 , Figure 4 and Figure 5 As shown, the manual adjustment assembly 4 also includes a first bearing 13, a second bearing 14, a third bearing 15, and a bevel gear seat cover 16. The first bearing 13 and the second bearing 14 are both sleeved on the bevel gear drive shaft 11, and the third bearing 15 is sleeved on the bevel gear shaft 12.

[0043] It should be noted that the first bearing 13, the second bearing 14 and the third bearing 15 are all equipped with ball bearings, which can reduce friction, improve transmission efficiency and stability; the bevel gear cover 16 serves to protect the manual adjustment component 4.

[0044] like Figure 4 and Figure 5As shown, the manual adjustment assembly 4 also includes a hole retaining ring 17, a first shaft retaining ring 18, and a second shaft retaining ring 19. The first shaft retaining ring 18 is sleeved on the bevel gear drive shaft 11, and the second shaft retaining ring 19 is sleeved on the bevel gear shaft 12. The hole retaining ring 17 is mounted on the third bearing 15.

[0045] It should be noted that the hole retaining ring 17, the first shaft retaining ring 18, and the second shaft retaining ring 19 all provide axial limiting to ensure structural reliability.

[0046] like Figure 6 and Figure 7 As shown, the reduction gear set 5 includes a main gear 20 and a helical gear set. The main gear 20 is connected to the screw 7, and the helical gear set is located between the main gear 20 and the output shaft 8.

[0047] like Figure 4 , Figure 6 and Figure 7 As shown, the helical gear assembly includes a transmission gear 21, a large helical gear 22, and a large helical gear transmission shaft 23. The large helical gear transmission shaft 23 passes through the middle of the transmission gear 21 and the large helical gear 22. The transmission gear 21 is located above the large helical gear 22. The transmission gear 21 meshes with the main gear 20, and the large helical gear 22 meshes with the output shaft 8. The output shaft 8 of the electric device 3 is provided with a meshing part that meshes with the large helical gear 22.

[0048] like Figure 2 As shown, the transmission mechanism 2 also includes an inner tube 24, an outer tube 25, and a telescopic push rod 26. The inner tube 24 is sleeved on the outside of the screw 7, and the upper end of the inner tube 24 is connected to the telescopic push rod 26. The outer tube 25 is sleeved on the outside of the inner tube 24 and connected to the upper cover 30.

[0049] It should be noted that the screw 7 is provided with a nut, and the inner tube 24 is connected to the nut. The inner tube 24 plays a telescopic role.

[0050] like Figure 2 and Figure 4 As shown, the transmission mechanism 2 also includes a skeleton oil seal 27 and a screw protective sleeve 28. The skeleton oil seal 27 is disposed between the upper cover 30 and the outer tube 25, and the screw protective sleeve 28 is disposed on the screw 7 and is located between the bevel gear seat cover 16 and the main gear 20.

[0051] like Figure 4 As shown, two ball bearings 29 are also fitted on the screw 7, and the two ball bearings 29 are located on both sides of the main gear 20.

[0052] like Figure 1 and Figure 2As shown, the protective cover 1 includes an upper cover 30, a middle cover 31, and a bottom cover 32. The lower end of the upper cover 30 is provided with an upper cover waterproof ring 33, and the lower end of the middle cover 31 is provided with a middle cover waterproof ring 34. The manual adjustment component 4 is located inside the bottom cover 32. Adjustment holes 35 are provided on both sides of the bottom cover 32, and both ends of the bevel gear shaft 12 are located within the adjustment holes 35. In this embodiment, a sealing cover can also be installed around the adjustment holes 35. This can be a flip-top plastic sealing cover to seal the adjustment holes 35; the sealing cover can be removed during use.

[0053] It should be noted that in the event of a power outage, an external tool can be used to insert a wrench into the bottom cover 32 by adjusting the through hole 35. The wrench can be used to turn the bevel gear drive shaft 11. With the meshing of the first bevel gear 9 and the second bevel gear 10, and the connection between the screw 7 and the bevel gear shaft 12, the screw 7 is driven to rotate. The rotating screw 7 will drive the nut and the inner tube 24 to slide back and forth along the central axis of the outer tube 25, thereby realizing the telescopic movement of the telescopic push rod 26 and achieving the purpose of transmission adjustment.

[0054] like Figure 1 and Figure 2 As shown, the upper cover 30, middle cover 31, and bottom cover 32 are fixed together with screws. The electric device 3 is a drive motor, which is fixed to the upper cover 30 with screws. The outer tube 25 is also fixed to the upper cover 30 with screws. The waterproof rings 33 and 34 of the upper cover and middle cover improve the sealing of the connection between the upper cover 30, middle cover 31, and bottom cover 32, thereby improving waterproof performance. Their material can be rubber.

[0055] like Figure 3 , Figure 6 and Figure 7 As shown, the stroke adjustment assembly 6 includes a stroke adjustment gear set 36, a potentiometer 37, a potentiometer gear 38, a cam adjustment set 39, a cam connecting gear 40, and a micro switch set 41. The potentiometer 37, the potentiometer gear 38, the cam adjustment set 39, and the micro switch set 41 are all installed inside the middle cover 31, and the stroke adjustment gear set 36 and the cam connecting gear 40 are all installed inside the upper cover 30.

[0056] like Figure 6 and Figure 7As shown, the stroke adjusting gear set 36 includes a small helical gear set 42 and several rotating gears. The small helical gear set 42 includes a rotating connecting gear, a small helical gear, and a small helical gear drive shaft. The small helical gear drive shaft passes through the middle position of the rotating connecting gear and the small helical gear. The small helical gear meshes with the output shaft 8 of the electric device 5. The rotating connecting gear is connected to one of the rotating gears. Several rotating gears mesh with each other. The potentiometer gear 38 and the cam connecting gear 40 mesh with the rotating gears respectively.

[0057] like Figure 3 As shown, it also includes a capacitor 43 and a circuit board 44, both of which are installed inside the middle cover 31. A relay is mounted on the circuit board 44. The circuit board 44 is electrically connected to the capacitor 43, potentiometer 37, microswitch assembly 41, and electric device 3. One end of the cam adjustment assembly 39 is in movable contact with the microswitch assembly 41. The upper end of the cam adjustment assembly 39 is connected to the cam connecting gear 40. The cam connecting gear 40 is connected to the stroke adjustment gear assembly 36. The upper end of the potentiometer 37 is connected to the potentiometer gear 38. The potentiometer gear 38 is connected to the stroke adjustment gear assembly 36.

[0058] like Figure 3 , 6 and Figure 7 As shown, the micro switch assembly 41 includes an upper micro switch and a lower micro switch, and the cam adjustment assembly 39 includes an upper cam and a lower cam. The upper cam and the lower cam are connected by tooth meshing, and the lower cam is provided with a rotation adjustment part 45.

[0059] It should be noted that when the upper cam disconnects from the upper micro switch, the telescopic push rod 26 is retracted and stationary, and the lower cam is connected to the lower micro switch. When the lower cam disconnects from the lower micro switch, the telescopic push rod 26 is extended, and the upper cam is connected to the upper micro switch. When the stroke needs to be adjusted, the operating rotary adjustment part 45 is moved downward. At this time, the lower cam disconnects from the lower micro switch, and the lower cam is rotated counterclockwise. The stroke of the corresponding telescopic push rod 26 is shortened, and vice versa. After completion, the lower cam is moved upward and reset. At this time, the potentiometer gear 38, cam adjustment group 39, cam connecting gear 40, output shaft 8, stroke adjustment gear group 36, main gear 20 and helical gear group are rotated to realize the stroke adjustment function.

[0060] like Figure 1 and Figure 2As shown, a signal line 46 and a power line 47 are provided on the side of the bottom cover 32. One end of the signal line 46 and one end of the power line 47 are connected to the circuit board 44, and the other ends of the signal line and the power line 47 are respectively used to connect to external devices.

[0061] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Those skilled in the art can readily implement this utility model based on the accompanying drawings and the above description. However, any modifications, alterations, or equivalent variations made by those skilled in the art without departing from the scope of the utility model's technical solution, utilizing the disclosed technical content, are considered equivalent embodiments of this utility model. Furthermore, any equivalent changes, alterations, or variations made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.

Claims

1. A manually operable electric linear actuator, characterized in that: It includes a protective cover (1), a transmission mechanism (2) and an electric device (3) fixed on the protective cover (1), a manual adjustment assembly (4) and a reduction gear set (5) installed inside the protective cover (1); The transmission mechanism (2) includes a screw (7), the lower end of which is connected to the manual adjustment assembly (4); The output end of the electric device (3) is provided with an output shaft (8); One end of the reduction gear set (5) is connected to the screw (7), and the other end of the reduction gear set (5) is connected to the output shaft (8); The manual adjustment assembly (4) includes a first bevel tooth (9), a second bevel tooth (10), a bevel tooth drive shaft (11), and a bevel tooth shaft (12). The bevel tooth drive shaft (11) is located below the bevel tooth shaft (12). The first bevel tooth (9) is sleeved on the bevel tooth drive shaft (11), and the second bevel tooth (10) is sleeved on the bevel tooth shaft (12). The first bevel tooth (9) and the second bevel tooth (10) mesh. The upper end of the bevel tooth shaft (12) is connected to the lower end of the screw (7).

2. The manually operable electric actuator according to claim 1, characterized in that: The manual adjustment assembly (4) also includes a first bearing (13), a second bearing (14), a third bearing (15), and a bevel gear cover (16). The first bearing (13) and the second bearing (14) are both mounted on the bevel gear drive shaft (11), and the third bearing (15) is mounted on the bevel gear shaft (12).

3. The manually operable electric actuator according to claim 2, characterized in that: The manual adjustment assembly (4) further includes a perforated snap ring (17), a first shaft snap ring (18), and a second shaft snap ring (19). The first shaft snap ring (18) is sleeved on the bevel gear drive shaft (11), and the second shaft snap ring (19) is sleeved on the bevel gear shaft (12). The perforated snap ring (17) is mounted on the third bearing (15).

4. The manually operable electric actuator according to claim 3, characterized in that: The reduction gear set (5) includes a main gear (20) and a helical gear set. The main gear (20) is connected to the screw (7), and the helical gear set is located between the main gear (20) and the output shaft (8).

5. The manually operable electric actuator according to claim 4, characterized in that: The helical gear assembly includes a transmission gear (21), a large helical gear (22), and a large helical gear transmission shaft (23). The large helical gear transmission shaft (23) passes through the middle of the transmission gear (21) and the large helical gear (22). The transmission gear (21) is located above the large helical gear (22). The transmission gear (21) meshes with the main gear (20), and the large helical gear (22) meshes with the output shaft (8).

6. The manually operable electric actuator according to claim 5, characterized in that: The transmission mechanism (2) also includes an inner tube (24), an outer tube (25) and a telescopic push rod (26). The inner tube (24) is sleeved on the outside of the screw (7). The upper end of the inner tube (24) is connected to the telescopic push rod (26). The outer tube (25) is sleeved on the outside of the inner tube (24).

7. The manually operable electric actuator according to claim 6, characterized in that: The transmission mechanism (2) also includes a skeleton oil seal (27) and a screw protective sleeve (28). The screw protective sleeve (28) is disposed on the screw (7) and is located between the bevel gear seat cover (16) and the main gear (20).

8. The manually operable electric actuator according to claim 7, characterized in that: Two ball bearings (29) are also fitted on the screw (7), and the two ball bearings (29) are located on both sides of the main gear (20).

9. The manually operable electric actuator according to claim 8, characterized in that: The protective cover (1) includes an upper cover (30), a middle cover (31) and a bottom cover (32). The lower end of the upper cover (30) is provided with an upper cover waterproof ring (33), and the lower end of the middle cover (31) is provided with a middle cover waterproof ring (34). The manual adjustment component (4) is located inside the bottom cover (32). The bottom cover (32) has adjustment holes (35) on both sides. Both ends of the bevel gear shaft (12) are located inside the adjustment holes (35).

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