Electric push rod

Abstract

The utility model discloses an electric push rod which comprises a driving assembly, a rotating structure and a push rod structure, the driving assembly, the rotating structure and the push rod structure are sequentially connected, the rotating structure comprises a rotating assembly and a protective cover, the protective cover wraps the outer side of the rotating assembly, and the protective cover comprises a lower connecting cover and an upper connecting cover. A positioning column is arranged at the top of the lower connecting cover, a positioning hole corresponding to the positioning column is formed in the upper connecting cover, a blocking block is arranged in the lower connecting cover and surrounds the peripheral side and the bottom side of the rotating assembly, the driving assembly is provided with a driving shaft, and the rotating assembly is provided with a first rotating shaft, a second rotating shaft and a third rotating shaft. The driving shaft is rotationally connected with the first rotating shaft, the first rotating shaft, the second rotating shaft and the third rotating shaft are sequentially and rotationally connected, the third rotating shaft is rotationally connected with the push rod structure, and the device has the advantages of being long in service life, small in occupied space and the like.

Description

Technical Field

[0001] This utility model belongs to the field of electric linear actuators, and particularly relates to an electric linear actuator. Background Technology

[0002] An electric linear actuator is an electrically driven device that converts the rotary motion of an electric motor into the linear reciprocating motion of a actuator. Together with its matching control equipment, it forms a linear drive system. Nowadays, higher demands are placed on electric linear actuators, requiring them to have a long service life while adapting to various harsh environments. The protection of rotating components and the reduction of space requirements are paramount, as the rotating components directly affect the lifespan of the electric linear actuator. Furthermore, the overall space required must be small to operate in various environments. Existing electric linear actuators cannot simultaneously meet both of these requirements. Utility Model Content

[0003] In view of the above-mentioned deficiencies of the prior art, the purpose of this utility model is to provide an electric push rod.

[0004] The technical solution of this utility model is as follows: An electric linear actuator includes a drive assembly, a rotating structure, and a push rod structure, which are connected sequentially. The rotating structure includes a rotating component and a protective cover. The protective cover surrounds the rotating component and includes a lower connecting cover and an upper connecting cover. The lower connecting cover has a positioning post at its top, and the upper connecting cover has a positioning hole corresponding to the positioning post. A blocking block is provided inside the lower connecting cover, surrounding the periphery and bottom of the rotating component. The drive assembly has a drive shaft, and the rotating assembly has a first rotating shaft, a second rotating shaft, and a third rotating shaft. The drive shaft is rotatably connected to the first rotating shaft, and the first, second, and third rotating shafts are rotatably connected sequentially. The third rotating shaft is rotatably connected to the push rod structure.

[0005] Furthermore, the first rotating shaft is provided with a first auxiliary shaft and a first main shaft, the first auxiliary shaft is located above the first main shaft, and the first main shaft is connected to the drive shaft.

[0006] Furthermore, the second rotating shaft is provided with a second auxiliary shaft and a second main shaft, the second auxiliary shaft is located above the second main shaft, and the second main shaft is connected to the first auxiliary shaft.

[0007] Furthermore, the third rotating shaft is provided with a third main shaft, which is connected to the first auxiliary shaft.

[0008] Furthermore, the push rod structure includes a push rod housing and a push rod assembly. The push rod housing is wrapped around the outside of the push rod assembly and connected to the lower end of the lower connecting cover. The push rod assembly includes a threaded telescopic rod, which is rotatably connected to the third rotating shaft.

[0009] Furthermore, the lower surface of the barrier block is provided with a connecting rod, and the bottom wall of the lower connecting cover is provided with a connecting hole corresponding to the connecting rod.

[0010] Furthermore, the connecting hole protrudes from the bottom wall of the lower connecting cover, and a wire passage is left between the lower surface of the barrier block and the bottom wall of the lower connecting cover.

[0011] Furthermore, there are three positioning posts, which are respectively located at the three ends of the top of the lower connecting cover, forming a triangular structure.

[0012] Furthermore, an end cap is fitted onto the upper end of the upper connecting cover, and the inner wall of the end cap is provided with teeth, the end cap being connected to the upper connecting cover through the teeth.

[0013] Furthermore, the end cap sidewall is provided with a notch, the upper connecting cover is provided with a limiting screw hole at the corresponding position, and the end cap also includes a limiting bolt, which passes through the limiting screw hole and is inserted into the notch.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This invention utilizes a three-layer gear design, consisting of a first rotating shaft, a second rotating shaft, and a third rotating shaft stacked vertically, reducing the gearbox volume. When the electric actuator malfunctions, the problem can be quickly located, reducing repair difficulty and time costs. A barrier block is added between the lower connecting cover and the rotating assembly to prevent wires from getting caught in the rotating assembly and to prevent grease loss, extending the service life of the rotating assembly. The lower and upper connecting covers are connected via positioning pins and holes, ensuring bearing concentricity. An end cap is fitted onto the top of the protective cover and connected with threaded joints, providing a good seal without taking up space. A limiting structure on the side wall of the end cap prevents loosening and improves connection stability. Attached Figure Description

[0016] Figure 1 This is an overall structural diagram of the present invention;

[0017] Figure 2 This is a cross-sectional view of the present invention;

[0018] Figure 3 This is a diagram of the rotating structure of this utility model;

[0019] Figure 4 This is a structural diagram of the first rotating shaft of this utility model;

[0020] Figure 5 This is a structural diagram of the second rotating shaft of this utility model;

[0021] Figure 6 This is a structural diagram of the third rotating shaft of this utility model;

[0022] Figure 7 yes Figure 2 Enlarged view at point P;

[0023] Figure 8 This is an overall structural diagram of the end cap of this utility model;

[0024] Figure 9 This is an overall structural diagram of the protective cover of this utility model;

[0025] Figure 10 This is a structural diagram of the internal structure of the protective cover of this utility model;

[0026] Figure 11 This is an overall structural diagram of the upper connecting cover of this utility model;

[0027] Figure 12 This is an overall structural diagram of the lower connecting cover of this utility model;

[0028] Figure 13 This is a diagram of the barrier block connection structure of this utility model;

[0029] Figure 14 This is an overall structural diagram of the barrier block of this utility model;

[0030] Figure 15 This is a cross-sectional view of the protective cover of this utility model;

[0031] In the diagram: 1. Drive assembly; 11. Drive shaft; 2. Rotating structure; 21. Protective cover; 211. Limiting screw hole; 212. Connecting block; 213. External threaded sleeve; 214. First boss; 215. First waterproof groove; 216. Fitting slot; 217. Lower connecting cover; 2171. Positioning pin; 2172. Second waterproof groove; 2173. Connecting hole; 2174. Wire passage; 218. Upper connecting cover; 2181. Positioning hole; 219. Barrier block; 2191. Connecting rod; 2192. Through hole; 22. Rotating assembly Components; 221, First rotating shaft; 2211, First shaft body; 2212, First auxiliary shaft; 2213, First main shaft; 222, Second rotating shaft; 2221, Second shaft body; 2222, First concave ring; 2223, Second main shaft; 2224, Second auxiliary shaft; 223, Third rotating shaft; 2231, Third shaft body; 2232, Second concave ring; 2233, Third main shaft; 3, Push rod structure; 31, Push rod housing; 32, Push rod assembly; 4, End cap; 41, Thread; 42, Notch; 43, Limiting bolt. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit the present application. That is, in some embodiments of the present application, these practical details are not necessary. In addition, for the sake of simplifying the drawings, some conventional structures and components will be shown in a simple schematic manner in the drawings.

[0033] It should be noted that all directional indications in the embodiments of this application, such as up, down, left, right, front, back, etc., are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indication will also change accordingly.

[0034] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit this application. They are merely used to distinguish components or operations described using the same technical terms and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0035] To further understand the utility model content, features and effects of this application, the following embodiments are provided, and detailed descriptions are given in conjunction with the accompanying drawings.

[0036] according to Figures 1 to 15As shown, this utility model provides an electric linear actuator, including a drive assembly 1, a rotating structure 2, and a push rod structure 3. The drive assembly 1, rotating structure 2, and push rod structure 3 are connected in sequence. The rotating structure 2 includes a rotating component 22 and a protective cover 21. The protective cover 21 wraps around the outside of the rotating component 22. The protective cover 21 includes a lower connecting cover 217 and an upper connecting cover 218. The lower connecting cover 217 has a positioning post 2171 at its top, and the upper connecting cover 218 has a positioning hole 2181 corresponding to the positioning post 2171. A blocking block 219 is provided inside the lower connecting cover 217, and the blocking block 219 surrounds the circumference and bottom of the rotating component 22. The lower connecting cover 217 is connected to the positioning hole 2181 of the upper connecting cover 218 through the positioning post 2171. After connection, the lower connecting cover 217 and the upper connecting cover 218 fit tightly together, protecting the internal rotating component 22. The positioning post 2171 also ensures the concentricity of the bearing. The drive assembly 1 is provided with a drive shaft 11, and the rotation assembly 22 is provided with a first rotation shaft 221, a second rotation shaft 222, and a third rotation shaft 223. The drive shaft 11 is rotatably connected to the first rotation shaft 221. The first rotation shaft 221, the second rotation shaft 222, and the third rotation shaft 223 are rotatably connected in sequence. The third rotation shaft 223 is rotatably connected to the push rod structure 3. The protective cover 21 covers the outside of the first rotation shaft 221, the second rotation shaft 222, and the third rotation shaft 223. The first shaft body 2211, the second shaft body 2221, and the third shaft body 2231 are all cylindrical. The protective cover 21 plays a protective role for the rotation assembly 22.

[0037] Specifically, the first rotating shaft 221 is provided with a first auxiliary shaft 2212 and a first main shaft 2213. The first auxiliary shaft 2212 is located above the first main shaft 2213, and the first main shaft 2213 is connected to the drive shaft 11. The first auxiliary shaft 2212 and the first main shaft 2213 rotate synchronously. The rotation radius of the first main shaft 2213 is larger than that of the first auxiliary shaft 2212. When the drive assembly 1 is turned on, the drive shaft 11 starts to rotate. The drive shaft 11 meshes with the first main shaft 2213, driving the first rotating shaft 221 to rotate. The rotation radius of the first main shaft 2213 is larger than that of the drive shaft 11. The drive shaft 11 rotates several times to drive the first main shaft 2213 to rotate once. The drive shaft 11 rotates at a relatively fast speed. The blocking block 219 is provided with a through hole 2192 for the rotating assembly 22 to pass through. The third rotating shaft 223 passes through the blocking block 219 and is connected to the push rod assembly 32.

[0038] Specifically, the second rotating shaft 222 is provided with a second auxiliary shaft 2224 and a second main shaft 2223. The second auxiliary shaft 2224 is located above the second main shaft 2223, and the second main shaft 2223 is connected to the first auxiliary shaft 2212. The rotation radius of the second main shaft 2223 is larger than that of the first auxiliary shaft 2212. When the first rotating shaft 221 rotates, the first auxiliary shaft 2212 meshes with the second main shaft 2223. The first rotating shaft 221 can drive the second main shaft 2223 to rotate one revolution after rotating several revolutions.

[0039] More specifically, a first concave ring 2222 is provided below the second spindle 2223, and the first spindle 2213 is partially suspended in the first concave ring 2222, which can provide rotation space for the first spindle 2213 and reduce the size of the gearbox.

[0040] Specifically, the third rotating shaft 223 is provided with a third main shaft 2233, which is connected to the first auxiliary shaft 2212. The rotation radius of the third main shaft 2233 is larger than that of the second auxiliary shaft 2224. When the second rotating shaft 222 rotates, the second auxiliary shaft 2224 meshes with the third main shaft 2233. The second rotating shaft 222 can drive the third main shaft 2233 to rotate one revolution after rotating several revolutions.

[0041] More specifically, a second concave ring 2232 is provided below the third main shaft 2233. The second main shaft 2223 is partially suspended inside the first concave ring 2222, which can provide rotation space for the second main shaft 2223 and reduce the size of the gearbox.

[0042] Specifically, the push rod structure 3 includes a push rod housing 31 and a push rod assembly 32. The push rod housing 31 wraps around the outside of the push rod assembly 32 and is connected to the lower end of the lower connecting cover 217. The push rod assembly 32 includes a threaded telescopic rod, which is rotatably connected to the third rotating shaft 223. The push rod housing 31 protects the push rod assembly 32 inside. The push rod assembly 32 is connected to the lower end of the third rotating shaft 223, and the rotating component 22 can drive the push rod assembly 32 to extend or retract.

[0043] Specifically, the lower surface of the barrier block 219 is provided with a connecting rod 2191, and the inner bottom wall of the lower connecting cover 217 is provided with a connecting hole 2173 corresponding to the connecting rod 2191. Multiple connecting rods 2191 are provided, protruding from the bottom surface of the barrier block 219 and distributed along the edge of the bottom surface of the barrier block 219. A wire passage channel 2174 is provided between the lower surface of the barrier block 219 and the inner bottom wall of the lower connecting cover 217. Multiple connecting holes 2173 are distributed on the bottom surface of the upper connecting cover 218 and correspond one to one of the connecting rods 2191 (an interference fit can be used later to ensure the stability after connection). Since the connecting holes 2173 protrude from the inner bottom wall of the lower connecting cover 217, it is equivalent to the connecting rods 2191 raising the barrier block 219. The wires can be connected to other components through the wire passage channel 2174, avoiding the wires from being caught in the rotating assembly 22. The barrier block 219 adopts a screwless locking structure, eliminating the risk of screws falling into the gears and extending the service life of the gears.

[0044] More specifically, the upper edge of the lower connecting cover 217 is provided with a second waterproof groove 2172, which surrounds the upper edge of the lower connecting cover 217. The second waterproof groove 2172 is located near the connection between the lower connecting cover 217 and the upper connecting cover 218. The second waterproof groove 2172 has a certain width. When in use, if water seeps in from the connection between the lower connecting cover 217 and the upper connecting cover 218, it will flow into the second waterproof groove 2172, preventing water from flowing directly into the rotating assembly 22 and affecting the rotating assembly 22.

[0045] Specifically, there are three positioning posts 2171, which are respectively located at the three ends of the top of the lower connecting cover 217, forming a triangular structure. The three positioning posts 2171 can effectively position the installation position and have good connection stability.

[0046] Specifically, an end cap 4 is fitted onto the upper end of the upper connecting cover 218. The inner wall of the end cap 4 is provided with threads 41, and the end cap 4 is connected to the upper connecting cover 218 through the threads 41. The end cap 4 seals the top of the upper connecting cover 218. The threaded connection eliminates screws and other components, improving the utilization of internal space. Furthermore, the top of the upper connecting cover 218 is lower on the outside and higher on the inside, improving the waterproof effect.

[0047] More specifically, the end cap 4 has a notch 42 on its side wall, and the upper connecting cover 218 has a corresponding limiting screw hole 211. The end cap 4 also includes a limiting bolt 43, which passes through the limiting screw hole 211 and is inserted into the notch 42. When the thread 41 rotates to a certain position, the notch 42 aligns with the limiting screw hole 211, and then the limiting bolt 43 is inserted and locked into the notch 42, which prevents the end cap 4 from loosening and ensures the accuracy of the joint angle.

[0048] The upper end of the corresponding upper connecting cover 218 is provided with a raised first boss 214. The surface of the first boss 214 is provided with a mounting groove 216. Connecting blocks 212 are provided on both sides of the mounting groove 216. The connecting blocks 212 are provided with the aforementioned limiting screw holes 211. A first waterproof groove 215 is also provided around the mounting groove 216. The external threaded sleeve 213 is mounted on the mounting groove 216 by bolts, and the bottom of the external threaded sleeve 213 covers the first waterproof groove 215. The corresponding end cap 4 is threadedly connected to the external threaded sleeve 213 by threads 41. The first boss 214 is provided with positioning connecting blocks 212 on both sides of its surface, and the positioning connecting blocks 212 are provided with the aforementioned limiting screw holes 211. The external threaded sleeve 213 is firmly fixed to the mounting groove 216 of the protective cover 21 by bolts, ensuring the stability and reliability of the connection.

[0049] In operation, the drive assembly 1 is activated, and the drive shaft 11 drives the first rotating shaft 221 to rotate. The first rotating shaft 221 drives the second rotating shaft 222 to rotate, and the second rotating shaft 222 drives the third rotating shaft 223 to rotate. The third rotating shaft 223 is fixedly connected to the threaded telescopic rod. The threaded telescopic rod is fitted with a threaded hollow rod. The rotation of the threaded telescopic rod and the threaded hollow rod pushes the threaded hollow rod outward. Due to the three-layer superimposed gear design, the rotation ratio is greatly increased. When it is necessary to inspect or replace internal components, the end cover 4 can be easily unscrewed without a complicated disassembly process, greatly saving maintenance time and costs and improving the maintainability of the equipment.

[0050] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. An electric push rod, comprising a driving assembly (1), a rotating structure (2) and a push rod structure (3), the driving assembly (1), the rotating structure (2) and the push rod structure (3) are connected in sequence, characterized in that: The rotating structure (2) comprises a rotating assembly (22) and a protective cover (21), the protective cover (21) is wrapped outside the rotating assembly (22), the protective cover (21) comprises a lower connecting cover (217) and an upper connecting cover (218), the lower connecting cover (217) is provided with a positioning column (2171) at the top, the upper connecting cover (218) is provided with a positioning hole (2181) corresponding to the positioning column (2171), a blocking block (219) is arranged in the lower connecting cover (217), the blocking block (219) surrounds the rotating assembly (22) on the side and the bottom, the driving assembly (1) is provided with a driving shaft (11), the rotating assembly (22) is provided with a first rotating shaft (221), a second rotating shaft (222) and a third rotating shaft (223), the driving shaft (11) is rotationally connected with the first rotating shaft (221), the first rotating shaft (221), the second rotating shaft (222) and the third rotating shaft (223) are rotationally connected in sequence, and the third rotating shaft (223) is rotationally connected with the push rod structure (3).

2. The motorized push rod of claim 1, wherein: The first rotating shaft (221) is provided with a first auxiliary shaft (2212) and a first main shaft (2213), the first auxiliary shaft (2212) is arranged above the first main shaft (2213), and the first main shaft (2213) is connected with the driving shaft (11).

3. The motorized push rod of claim 2, wherein: The second rotating shaft (222) is provided with a second auxiliary shaft (2224) and a second main shaft (2223), the second auxiliary shaft (2224) is arranged above the second main shaft (2223), and the second main shaft (2223) is connected with the first auxiliary shaft (2212).

4. The motorized push rod of claim 3, wherein: The third rotating shaft (223) is provided with a third main shaft (2233), and the third main shaft (2233) is connected with the first auxiliary shaft (2212).

5. The motorized push rod of claim 1, wherein: The push rod structure (3) comprises a push rod shell (31) and a push rod assembly (32), the push rod shell (31) is wrapped outside the push rod assembly (32) and connected to the lower end of the lower connecting cover (217), the push rod assembly (32) comprises a threaded telescopic rod, and the threaded telescopic rod is rotationally connected with the third rotating shaft (223).

6. The motorized push rod of claim 1, wherein: A connecting rod (2191) is arranged on the lower surface of the blocking block (219), and a connecting hole (2173) corresponding to the connecting rod (2191) is arranged on the inner bottom wall of the lower connecting cover (217).

7. The motorized push rod of claim 6, wherein: The connecting hole (2173) protrudes from the inner bottom wall of the lower connecting cover (217), and a wire passing channel (2174) is formed between the lower surface of the blocking block (219) and the inner bottom wall of the lower connecting cover (217).

8. The motorized push rod of claim 1, wherein: The positioning column (2171) is three, and is arranged at three end points of the top of the lower connecting cover (217) respectively, and the three end points form a triangular structure.

9. The motorized push rod of claim 1, wherein: An end cover (4) is arranged on the upper end of the upper connecting cover (218), a tooth (41) is arranged on the inner wall of the end cover (4), and the end cover (4) is connected with the upper connecting cover (218) through the tooth (41).

10. The motorized push rod of claim 9, wherein: The side wall of the end cover (4) is provided with a notch (42), the upper connecting cover (218) is provided with a limiting screw hole (211) at a corresponding position, and the end cover (4) further comprises a limiting screw bolt (43), the limiting screw bolt (43) is inserted into the notch (42) through the limiting screw hole (211).

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