Multi-section type electric push rod

Abstract

The utility model discloses a multi-section type electric push rod. The multi-section type electric push rod comprises a shell and a motor. A sliding plate is slidably mounted in the shell, a first-stage push rod capable of extending out of the shell is fixedly arranged at the front end of the sliding plate, a second-stage push rod capable of extending out of the first-stage push rod is slidably mounted in the first-stage push rod, and a first gear and a second gear which are meshed with each other are rotatably mounted at the rear end of the sliding plate; a gear shaft is rotationally installed in the shell and is in sliding fit with the first gear, a transmission gear set is arranged in the shell and can transmit power of the motor to the first pushing mechanism and the gear shaft, then the first pushing mechanism drives the sliding plate to slide, and the gear shaft drives the first gear to rotate through a key block. The first gear rotates to sequentially drive a second gear and a second pushing mechanism to rotate, so that a second-stage pushing rod is driven to slide; according to the utility model, multi-section telescoping can be realized, so that different working distance and space requirements can be met.

Description

Technical Field

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

[0002] An electric linear actuator is an electric actuator that converts the rotary motion of a motor into linear motion. It can be used to push or pull objects or mechanisms that need to be moved, such as dampers, valves, gates, and baffles. Electric linear actuators are characterized by simple structure, smooth operation, high precision, good self-locking performance, and hygiene, and are widely used in equipment across various industries.

[0003] For example, Chinese invention CN119864993A discloses a low-noise electric linear actuator, which clamps the driven gear along the axial direction of the lead screw using a first bearing and a second bearing, limiting the runout of the driven gear caused by the rotation and oscillation of the lead screw. This has the advantage of improving the overall smoothness and quietness of the electric linear actuator. However, such a structure still has the following significant drawbacks:

[0004] 1. Most existing electric linear actuators are single-section, meaning they have only one guide sleeve and one actuator, which limits their stroke and cannot meet different working distance and space requirements;

[0005] 2. Existing electric linear actuators typically do not have a deceleration device. When a heavy object is connected to the end of the electric linear actuator, the object has a certain inertia as it moves under the action of the electric linear actuator. When the electric linear actuator reaches its limit length and begins to retract, if the speed is too fast or there is no appropriate buffering measure, the heavy object will continue to move forward due to inertia, thereby impacting the linear actuator and causing the gears inside the electric linear actuator to break, affecting the use of the entire electric linear actuator. Summary of the Invention

[0006] This utility model aims to solve one of the technical problems existing in the prior art.

[0007] This application provides a multi-stage electric linear actuator, including a housing and a motor; it also includes a first-stage push mechanism and a second-stage push mechanism. A sliding plate is slidably installed inside the housing. A first-stage push rod that can extend out of the housing is fixed at the front end of the sliding plate. A second-stage push rod that can extend out of the first-stage push rod is slidably installed inside the first-stage push rod. A first-stage gear and a second-stage gear that mesh with each other are rotatably installed at the rear end of the sliding plate. A gear shaft is rotatably installed inside the housing, and the gear shaft is in sliding engagement with the first-stage gear. A transmission gear set is provided inside the housing. The transmission gear set can transmit the power of the motor to the first-stage push mechanism and the gear shaft, thereby causing the first-stage push mechanism to drive the sliding plate to slide. The gear shaft drives the first-stage gear to rotate through a key block. The rotation of the first-stage gear drives the second-stage gear and the second-stage push mechanism to rotate in sequence, thereby driving the second-stage push rod to slide.

[0008] Furthermore, the first driving mechanism includes a first rotating lead screw and a first lead screw nut. The first rotating lead screw is rotatably installed inside the housing, and the first lead screw nut is fixedly installed on the sliding plate. The first rotating lead screw and the first lead screw nut are threadedly connected.

[0009] Furthermore, the second pushing mechanism includes a second rotating lead screw and a second lead screw nut. The second pushing lead screw is rotatably installed inside the first-stage push rod, and the second lead screw nut is fixedly installed on the second-stage push rod. The second rotating lead screw and the second lead screw nut are threadedly connected.

[0010] Furthermore, the transmission gear set includes a drive gear, a first driven gear, a second driven gear, and a third driven gear that mesh in sequence. The drive gear is fixedly connected to the output shaft of the motor, the first driven gear is fixedly connected to the first rotating lead screw, the second driven gear is rotatably installed in the housing, and the third driven gear is fixedly connected to the gear shaft.

[0011] Furthermore, four mounting blocks are fixedly provided on the sliding plate, forming an H-shape with the sliding plate. Four guide rods are fixedly provided inside the housing, and the four guide rods are slidably engaged with the four mounting blocks respectively.

[0012] Furthermore, the first-stage push rod is provided with a guide groove, and the second-stage push rod is fixed with a guide block that slides in cooperation with the guide groove.

[0013] Furthermore, the inner diameter of the second-stage push rod is larger than the outer diameter of the second rotating lead screw.

[0014] Furthermore, an annular groove is also provided inside the first-stage push rod.

[0015] Furthermore, a rolling bearing is provided between the first gear and the sliding plate, and a rolling bearing is provided between the second driven gear and the housing.

[0016] Furthermore, a friction disc is fixed on the sliding plate, and an installation groove is provided on the friction disc. An installation column is eccentrically provided in the installation groove, and a rotating block is rotatably installed on the installation column. A disc is fixed on the second rotating screw, and a spiral groove is provided on the disc. A pushing column that slides and engages with the spiral groove is provided at one end of the rotating block facing the corresponding disc.

[0017] The rotating block has a floating friction block installed inside it, and one end of the friction block can press against the inner wall of the friction disc.

[0018] The beneficial effects of this utility model are as follows:

[0019] 1. By setting up a first-stage push rod, a second-stage push rod, a transmission gear set, and a first-stage and a second-stage push mechanism, multi-stage extension and retraction can be achieved, thereby adapting to different working distances and space requirements;

[0020] 2. Through the arrangement of friction disc, rotating block, disc, spiral groove, pushing cylinder and friction block, when the secondary push rod is loaded with a heavy object and pushed to near its limit length, the friction disc will come into contact with the friction block to generate friction force, which will reduce the speed of the secondary push rod relatively smoothly, avoiding its excessive retraction speed and inertial impact on the transmission gear set, gear one and gear two, thus ensuring the safe use of the entire equipment. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a multi-segment electric actuator in an embodiment of this application;

[0022] Figure 2 This is a schematic diagram of the internal structure of a multi-segment electric linear actuator according to an embodiment of this application;

[0023] Figure 3 for Figure 2 Enlarged structural diagram at point A;

[0024] Figure 4 This is a schematic diagram of the structure of the transmission gear set, the first pushing mechanism, the gear shaft, the first gear, the second gear and the sliding plate in the embodiment of this application;

[0025] Figure 5 This is a schematic diagram of the internal structure of the first-stage push rod and the second-stage push rod in the embodiments of this application;

[0026] Figure 6 This is a schematic diagram of the structure of the sliding plate, the first gear, and the rolling bearing in the embodiments of this application;

[0027] Figure 7 This is a schematic diagram of the structure of the friction disk, rotating block, disc, pushing cylinder, and friction block in the embodiments of this application;

[0028] Figure 8 This is a diagram illustrating the linkage effect between the friction block and the friction disk in an embodiment of this application.

[0029] Figure 9 This is a schematic diagram illustrating the connection principle between the pushing cylinder and the spiral groove in an embodiment of this application.

[0030] Figure Labels

[0031] 1-Housing, 11-Guide rod, 2-Motor, 3-Sliding plate, 31-First stage push rod, 32-Second stage push rod, 33-Gear No. 1, 34-Gear No. 2, 35-Mounting block, 36-Guide groove, 37-Guide block, 4-Gear shaft, 5-Transmission gear set, 51-Drive gear, 52-Driven gear No. 1, 53-Driven gear No. 2, 54-Driven gear No. 3, 61-Push mechanism No. 1, 611-Rotating screw No. 1, 612-Screw nut No. 1, 62-Push mechanism No. 2, 621-Rotating screw No. 2, 622-Screw nut No. 2, 63-Annular groove, 7-Rolling bearing, 81-Friction disc, 82-Mounting groove, 83-Rotating block, 84-Disc, 85-Helical groove, 86-Pushing cylinder, 87-Friction block. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0033] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0034] The following description, in conjunction with the accompanying drawings, details a multi-segment electric actuator provided in this application through specific embodiments and application scenarios.

[0035] Example 1:

[0036] like Figures 1 to 5As shown, this application embodiment provides a multi-segment electric actuator, including a housing 1 and a motor 2; it also includes a first-stage push mechanism 61 and a second-stage push mechanism 62. A sliding plate 3 is slidably installed inside the housing 1. A first-stage push rod 31 that can extend out of the housing 1 is fixed at the front end of the sliding plate 3. A second-stage push rod 32 that can extend out of the first-stage push rod 31 is slidably installed inside the first-stage push rod 31. A first-stage gear 33 and a second-stage gear 34 that mesh with each other are rotatably installed at the rear end of the sliding plate 3. A gear shaft 4 is rotatably installed inside the housing 1. The gear shaft 4 is slidably engaged with the first-stage gear 33. A transmission gear set 5 is provided inside the housing 1. The transmission gear set 5 can transmit the power of the motor 2 to the first-stage push mechanism 61 and the gear shaft 4, thereby causing the first-stage push mechanism 61 to drive the sliding plate 3 to slide. The gear shaft 4 drives the first-stage gear 33 to rotate through a key block. The rotation of the first-stage gear 33 drives the second-stage gear 34 and the second-stage push mechanism 62 to rotate in sequence, thereby driving the second-stage push rod 32 to slide.

[0037] Furthermore, the first driving mechanism 61 includes a first rotating lead screw 611 and a first lead screw nut 612. The first rotating lead screw 611 is rotatably installed inside the housing 1, and the first lead screw nut 612 is fixedly installed on the sliding plate 3. The first rotating lead screw 611 and the first lead screw nut 612 are threadedly connected.

[0038] Furthermore, the second pushing mechanism 62 includes a second rotating lead screw 621 and a second lead screw nut 622. The second pushing lead screw is rotatably installed inside the first-stage push rod 31, and the second lead screw nut 622 is fixedly installed on the second-stage push rod 32. The second rotating lead screw 621 and the second lead screw nut 622 are threadedly connected.

[0039] Furthermore, the transmission gear set 5 includes a drive gear 51, a first driven gear 52, a second driven gear 53, and a third driven gear 54 that mesh in sequence. The drive gear 51 is fixedly connected to the output shaft of the motor 2, the first driven gear 52 is fixedly connected to the first rotating lead screw 611, the second driven gear 53 is rotatably installed in the housing 1, and the third driven gear 54 is fixedly connected to the gear shaft 4.

[0040] Furthermore, four mounting blocks 35 are fixed on the sliding plate 3, and the four mounting blocks 35 and the sliding plate 3 form an H shape. Four guide rods 11 are fixed inside the housing 1, and the four guide rods 11 are respectively slidably engaged with the four mounting blocks 35.

[0041] Furthermore, the first-stage push rod 31 is provided with a guide groove 36, and the second-stage push rod 32 is fixed with a guide block 37 that slides in cooperation with the guide groove 36.

[0042] In this embodiment of the application, due to the above-described structure, the motor 2 can drive the drive gear 51 to rotate clockwise, thereby causing the first-stage push rod 31 to extend out of the housing 1 and the second-stage push rod 32 to extend out of the first-stage push rod 31. The motor 2 can drive the drive gear 51 to rotate counterclockwise, thereby causing the first-stage push rod 31 to retract into the housing 1 and the second-stage push rod 32 to retract into the first-stage push rod 31.

[0043] When motor 2 starts, it drives drive gear 51 to rotate. Since drive gear 51, driven gear 52, driven gear 53 and driven gear 54 mesh in sequence, the rotation of drive gear 51 drives driven gear 52, driven gear 53 and driven gear 54 to rotate in sequence. The rotation of driven gear 52 will drive the first rotating screw 611 to rotate synchronously. Since the first rotating screw 611 is threadedly connected to the first screw nut 612, the rotation of the first rotating screw 611 will drive the sliding plate 3 to slide along the four guide rods 11, so that the first stage push rod 31 extends or retracts from the housing 1.

[0044] The rotation of the third driven gear 54 will drive the gear shaft 4 to rotate. The gear shaft 4 will drive the first gear 33 to rotate synchronously through the key block. The rotation of the first gear 33 will drive the second gear 34 to rotate. The rotation of the second gear 34 will drive the second rotating lead screw 621 to rotate synchronously. Since the second rotating lead screw 621 is threadedly connected to the second lead screw nut 622, the rotation of the second rotating lead screw 621 will drive the second-stage push rod 32 to slide inside the first-stage push rod 31, so that the second-stage push rod 32 extends or retracts from the first-stage push rod 31.

[0045] The first-stage push rod 31 is provided with a guide groove 36, and the second-stage push rod 32 is fixed with a guide block 37 that slides in cooperation with the guide groove 36. The guide block 37 and the guide groove 36 together restrict the second-stage push rod 32 to slide only within the first-stage push rod 31.

[0046] As the sliding plate 3 slides along the four guide rods 11, the sliding plate 3 will drive the first gear 33 to slide along the gear shaft 4. The gear shaft 4 can always drive the first gear 33 to rotate through the key block.

[0047] Example 2:

[0048] like Figures 4 to 6 As shown, in this embodiment, in addition to the structural features of the aforementioned embodiments, the inner diameter of the secondary push rod 32 is larger than the outer diameter of the second rotating lead screw 621.

[0049] Furthermore, the first-stage push rod 31 is also provided with an annular groove 63.

[0050] Furthermore, a rolling bearing 7 is provided between the first gear 33 and the sliding plate 3, and a rolling bearing 7 is provided between the second driven gear 53 and the housing 1.

[0051] In this embodiment of the application, due to the above-described structure, the inner diameter of the secondary push rod 32 is larger than the outer diameter of the second rotating lead screw 621, which reduces the contact area between the second rotating lead screw 621 and the inner wall of the secondary push rod 32, thereby reducing friction, alleviating the wear of the second rotating lead screw 621 and the second lead screw nut 622, and extending the service life.

[0052] The first-stage push rod 31 is also provided with an annular groove 63. The annular groove 63 can reduce the contact area between the second-stage push rod 32 and the first-stage push rod 31, thereby reducing friction, reducing the wear of the second rotating lead screw 621 and the second lead screw nut 622, and extending the service life.

[0053] A rolling bearing 7 is provided between the first gear 33 and the sliding plate 3. The outer ring of the rolling bearing 7 is fixedly installed on the sliding plate 3, and the inner ring is fixedly installed on the first gear 33. The rolling bearing 7 uses rolling friction instead of sliding friction, which can effectively reduce the friction between the first gear 33 and the sliding plate 3, thereby making the operation of the electric push rod smoother. A rolling bearing 7 is also provided between the second driven gear 53 and the housing 1. The outer ring of the rolling bearing 7 is fixedly installed on the housing 1, and the inner ring is fixedly installed on the second driven gear 53. The rolling bearing 7 uses rolling friction instead of sliding friction, which can effectively reduce the friction between the second driven gear 53 and the housing 1, further making the operation of the electric push rod smoother.

[0054] Example 3:

[0055] like Figures 7 to 9 As shown, in this embodiment, in addition to the structural features of the aforementioned embodiments, a friction disk 81 is fixedly mounted on the sliding plate 3, a mounting groove 82 is provided on the friction disk 81, a mounting column is eccentrically provided in the mounting groove 82, a rotating block 83 is rotatably mounted on the mounting column, a disc 84 is fixedly mounted on the second rotating screw 621, a spiral groove 85 is provided on the disc 84, and a pushing cylinder 86 that slides and cooperates with the spiral groove 85 is provided at one end of the rotating block 83 facing the corresponding disc 84; wherein, a friction block 87 is floatingly mounted in the rotating block 83, and one end of the friction block 87 can press against the inner sidewall of the friction disk 81.

[0056] In this embodiment of the application, due to the above-described structure, the pushing cylinder 86 is initially located at the starting end of the spiral groove 85, and the friction block 87 is not in contact with the inner wall of the friction disk 81. During the process of the pushing cylinder 86 sliding from the starting end to the ending end of the spiral groove 85, the distance between the center of the pushing cylinder 86 and the center of the disk 84 gradually increases.

[0057] When the second rotating screw 621 rotates, it drives the second-stage push rod 32 to reciprocate, which in turn drives the disc 84 to rotate. The disc 84 drives the rotating block 83 to rotate through the spiral groove 85. When the second-stage push rod 32 extends to its limit, the friction block 87 contacts the friction disc 81. As the rotating block 83 rotates, under the action of the spring, the friction block 87 presses against the inner wall of the friction disc 81, and the pressure gradually increases. Since the inner circumference of the friction disc 81 and the end of the friction block 83 extending from the rotating block 83 are both made of frosted material, the frictional force gradually increases. When the power of the motor 2 is constant, when the second rotating screw 621 is subjected to frictional force, the speed of the second-stage push rod 32 will decrease accordingly. This will result in a smooth deceleration of the second-stage push rod 32, preventing the second-stage push rod 32 from retracting too quickly and causing inertial impact on the first gear 33, the second gear 34, and the transmission gear set 5, thus ensuring the safe use of the entire equipment.

[0058] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0059] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A multi-segment electric linear actuator, comprising a housing and a motor, characterized in that, It also includes a first-stage push mechanism and a second-stage push mechanism. A sliding plate is slidably installed inside the housing. A first-stage push rod that can extend out of the housing is fixed at the front end of the sliding plate. A second-stage push rod that can extend out of the first-stage push rod is slidably installed inside the first-stage push rod. A first-stage gear and a second-stage gear that mesh with each other are rotatably installed at the rear end of the sliding plate. A gear shaft is rotatably installed inside the housing. The gear shaft is in sliding engagement with the first-stage gear. A transmission gear set is provided inside the housing. The transmission gear set can transmit the power of the motor to the first-stage push mechanism and the gear shaft, thereby causing the first-stage push mechanism to drive the sliding plate to slide. The gear shaft drives the first-stage gear to rotate through a key block. The rotation of the first-stage gear drives the second-stage gear and the second-stage push mechanism to rotate in turn, thereby driving the second-stage push rod to slide.

2. The multi-segment electric linear actuator according to claim 1, characterized in that, The first driving mechanism includes a first rotating lead screw and a first lead screw nut. The first rotating lead screw is rotatably installed inside the housing, and the first lead screw nut is fixedly installed on the sliding plate. The first rotating lead screw and the first lead screw nut are threadedly connected.

3. A multi-segment electric linear actuator according to claim 1, characterized in that, The second pushing mechanism includes a second rotating lead screw and a second lead screw nut. The second pushing lead screw is rotatably installed inside the first-stage push rod, and the second lead screw nut is fixedly installed on the second-stage push rod. The second rotating lead screw and the second lead screw nut are threadedly connected.

4. A multi-segment electric linear actuator according to claim 2, characterized in that, The transmission gear set includes a drive gear, a first driven gear, a second driven gear, and a third driven gear that mesh in sequence. The drive gear is fixedly connected to the output shaft of the motor, the first driven gear is fixedly connected to the first rotating lead screw, the second driven gear is rotatably installed in the housing, and the third driven gear is fixedly connected to the gear shaft.

5. A multi-segment electric linear actuator according to claim 1, characterized in that, Four mounting blocks are fixedly mounted on the sliding plate, forming an H-shape with the sliding plate. Four guide rods are fixedly mounted inside the housing, and the four guide rods slide in cooperation with the four mounting blocks respectively.

6. A multi-segment electric linear actuator according to claim 1, characterized in that, The first-stage push rod is provided with a guide groove, and the second-stage push rod is fixed with a guide block that slides in cooperation with the guide groove.

7. A multi-segment electric linear actuator according to claim 3, characterized in that, The inner diameter of the second-stage push rod is larger than the outer diameter of the second rotating lead screw.

8. A multi-segment electric linear actuator according to claim 3, characterized in that, The first-stage push rod also has an annular groove.

9. A multi-segment electric linear actuator according to claim 4, characterized in that, A rolling bearing is provided between the No. 1 gear and the sliding plate, and a rolling bearing is provided between the No. 2 driven gear and the housing.

10. A multi-segment electric linear actuator according to claim 3, characterized in that, A friction disc is fixed on the sliding plate. The friction disc has an installation groove. An installation column is eccentrically installed in the installation groove. A rotating block is rotatably installed on the installation column. A disc is fixed on the second rotating screw. A spiral groove is provided on the disc. A pushing column that slides and engages with the spiral groove is provided at the end of the rotating block facing the corresponding disc. The rotating block has a floating friction block installed inside it, and one end of the friction block can press against the inner wall of the friction disc.

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