A functional motor with built-in high load and large stroke drag shell push rod

Abstract

The present invention discloses a high-load-bearing and long-stroke drag-shell push rod with a built-in functional motor, which relates to the technical field of electric push rods and solves the technical problems that the electric push rod has a large volume and the functional motor occupies a travel space, which limits the single-layer travel. The present invention comprises a base and a driving mechanism arranged on the base, and the base is provided with multiple layers of push rod power transmission telescopic components which are sequentially arranged, and the driving mechanism is embedded in the push rod power transmission telescopic components and drives the push rod power transmission telescopic components to rise and fall. The present invention has a simple structure and adopts an embedded motor push rod to change the transmission structure of the original traditional external motor push rod, so that the volume is compact, the structure is simple, and the configuration is more reasonable. Because the embedded functional motor does not occupy the travel space, the single-layer travel is maximized, and the embedded motor only provides rotational power and does not bear pressure and tension, so the push-pull force output bearing capacity can be very large.

Description

Technical Field

[0001] This invention relates to the field of electric linear actuator technology, and more specifically to a high-load-bearing, long-stroke sliding-shell linear actuator with a built-in functional motor, used for linear reciprocating motion of the 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 linear actuator. It can be used as an actuator in various simple or complex processes to achieve remote, centralized, or automatic control. Electric linear actuators are general-purpose auxiliary drive devices widely used in industries such as power, machinery, metallurgy, transportation, mining, petroleum, chemical, hoisting, transportation, construction, and food processing. They are characterized by reliable performance, sensitive operation, smooth running, consistent push and pull force, and good environmental adaptability.

[0003] An electric linear actuator consists of a drive motor, reduction gears, a screw, a nut, a guide sleeve, a push rod, a slide, a spring, a housing, a worm gear, and a micro-switch. The motor, after being reduced in speed by gears, drives a pair of lead screws and nuts. This converts the motor's rotational motion into linear motion, and the forward and reverse rotation of the motor completes the actuator's movement. Complex movements such as rotation and rocking can be achieved through various levers, rockers, or linkages. The stroke can be increased or decreased by changing the lever arm length.

[0004] However, the existing external motor push rod transmission structure has the disadvantages of large size and the motor occupying the stroke space, which makes the single-layer stroke relatively limited. Summary of the Invention

[0005] The purpose of this invention is to solve the technical problems of existing electric linear actuators, such as large size and limited single-layer stroke due to the motor occupying the stroke space. This invention provides a high-load-bearing, long-stroke drag-shell linear actuator with a built-in functional motor.

[0006] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0007] A functional motor with built-in high load capacity and long stroke sliding shell type push rod includes a base and a drive mechanism set on the base. The base is provided with multiple layers of push rod power transmission telescopic components nested in sequence. The drive mechanism is embedded inside the push rod power transmission telescopic components and drives the push rod power transmission telescopic components to move up and down. The drive mechanism adopts an embedded motor (or a geared motor).

[0008] Furthermore, the push rod power transmission telescopic assembly is a two-layered push rod power transmission telescopic assembly, comprising a first-layer push rod assembly and a second-layer push rod assembly sleeved inside the first-layer push rod assembly. The first and second-layer push rod assemblies have openings at their bottoms. An inner support sleeve located above the drive mechanism is disposed within the second-layer push rod assembly. A second-layer hollow transmission rod is disposed at the center of the inner support sleeve. The upper end of the second-layer hollow transmission rod extends out of the inner support sleeve and is fixedly connected to a second-layer push rod threaded sleeve. The second-layer push rod threaded sleeve is aligned with the inner wall of the second-layer push rod threaded sleeve. The second hollow transmission rod has a threaded connection and a first transmission shaft that can move up and down. The upper end of the first transmission shaft extends into a second push rod threaded sleeve, and the second push rod assembly is connected to the first push rod threaded sleeve. The first push rod threaded sleeve is threadedly connected to the inner wall of the first push rod assembly. The drive mechanism includes a functional motor and an independent support and protection frame located outside the functional motor. The upper and lower ends of the independent support and protection frame are fixedly connected to the base and the inner support sleeve, respectively. The output shaft of the functional motor extends out of the independent support and protection frame and passes through the inner support sleeve to be keyed to the second hollow transmission rod.

[0009] Furthermore, the first-layer push rod assembly includes a hollow first-layer push rod and a first-layer push rod sleeve disposed on top of the first-layer push rod.

[0010] Furthermore, the second-layer push rod assembly includes a hollow second-layer push rod and a second-layer push rod sleeve disposed on top of the second-layer push rod.

[0011] Furthermore, the first-layer push rod threaded sleeve is locked onto the first-layer drive shaft by a locking assembly, wherein the locking assembly is a locking bolt.

[0012] Furthermore, the first-layer transmission shaft is axially provided with protruding posts or protruding strips, and the second-layer hollow transmission rod is axially provided with grooves that cooperate with the protruding posts or protruding strips, so that the first-layer transmission shaft can reciprocate up and down in the second-layer hollow transmission rod.

[0013] Furthermore, a flat pressure bearing A is provided below the first layer push rod threaded sleeve and sleeved on the first layer transmission shaft. The flat pressure bearing A is located above the second layer push rod assembly. A flat pressure bearing B is provided below the second layer push rod threaded sleeve and sleeved on the second layer hollow transmission rod. The flat pressure bearing B is located above the inner support sleeve. A flat pressure bearing C is provided at the top of the independent support protection frame and sleeved on the output shaft of the motor.

[0014] Furthermore, the outer wall of the second-layer push rod assembly is provided with an anti-rotation protrusion (or strip), the inner wall of the first-layer push rod assembly is provided with an anti-rotation groove that cooperates with the anti-rotation protrusion (or strip), the inner support sleeve is provided with an anti-rotation protrusion (or strip), and the inner wall of the second-layer push rod assembly is provided with an anti-rotation groove that cooperates with the corresponding anti-rotation protrusion (or strip).

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. This invention features a simple structure, employing an embedded motor (or geared motor) push rod to change the transmission structure of the traditional external motor push rod. This results in a compact size, simple structure, and more rational configuration. Because the embedded motor (or geared motor) does not occupy stroke space, the single-layer stroke is maximized. The embedded motor (or geared motor) only provides rotational power and does not bear pressure or tension, thus allowing for a very high output push-pull force. It is suitable for complex or simple processes and has advantages such as convenient structure, easy installation, reliable use, simple maintenance, and energy saving. Compared with hydraulic and pneumatic systems, it not only eliminates the complex system and reduces weight but is also not limited by climate or environment.

[0017] 2. Because the first and second push rod sleeves naturally form two rainproof covers, and the inner support sleeve is a closed support sleeve, the waterproof performance of this structure is very good, which can extend its service life.

[0018] 3. A flat pressure bearing A is provided below the threaded sleeve of the first-layer push rod and is sleeved on the first-layer transmission shaft. A flat pressure bearing B is provided below the threaded sleeve of the second-layer push rod and is sleeved on the second-layer hollow transmission rod. A flat pressure bearing C is provided at the top of the independent support protection frame and is sleeved on the output shaft of the motor. The arrangement of flat pressure bearings A, B and C can reduce the friction in the transmission, thereby effectively reducing the wear of related parts.

[0019] 4. External upper pressure first acts on the first-layer push rod sleeve, then presses down through the first-layer push rod threaded sleeve to the second-layer push rod sleeve, then sequentially presses down to the second-layer push rod threaded sleeve, the inner support sleeve, and the independent support protection frame, finally being transmitted to the base; external upper tension first acts on the first-layer push rod sleeve, then pulls up through the first-layer push rod threaded sleeve to the second-layer push rod sleeve, then through the second-layer hollow transmission rod and the lower fastening bolt of the second-layer hollow transmission shaft, pulling up to the independent support protection frame, and then transmitted from the independent support protection frame to the base; in summary, the push and pull forces of this invention will not be applied to the motor and motor shaft, effectively protecting the motor and improving its load-bearing capacity. Therefore, the motor only outputs rotational power and does not bear downward pressure or upward tension. Attached Figure Description

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Reference numerals: 1-base, 2-drive mechanism, 3-motor, 4-flat pressure bearing C, 5-output shaft, 6-first layer transmission shaft, 7-second layer hollow transmission rod, 8-inner support sleeve, 9-second layer push rod assembly, 10-first layer push rod assembly, 11-second layer push rod threaded sleeve, 12-first layer push rod threaded sleeve, 13-locking assembly, 14-flat pressure bearing A, 15-flat pressure bearing B. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0024] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] In the description of the embodiments of the present invention, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0026] Example 1

[0027] like Figure 1As shown, this embodiment provides a high-load, long-stroke sliding push rod with a built-in functional motor, including a base 1 and a drive mechanism mounted on the base 1. The base 1 is provided with multiple layers of push rod power transmission telescopic components arranged in sequence. The drive mechanism 2 is nested inside the push rod power transmission telescopic components and drives the push rod power transmission telescopic components to move up and down. The drive mechanism 2 adopts an embedded functional motor (or a geared motor).

[0028] In this embodiment, the built-in high-load-bearing, long-stroke sliding push rod of the functional motor is suitable for various complex or simple processes, and has advantages such as convenient structure, easy installation, reliable use, simple maintenance, and energy saving. Compared with hydraulic and pneumatic systems, it not only eliminates the complex system and reduces weight, but is also not limited by climate and environment.

[0029] Among them, the motor, reducer, brake, and speed encoder are called multi-functional motors; the motor provides rotational power adapted to the push rod; the reducer provides speed matching adapted to the push rod and increases output torque; the brake prevents the push rod from being pushed down or pulled up under the action of external force when the push rod motor is de-energized; the speed encoder provides accurate information to control the position of the push rod.

[0030] An automatic overload protection device can also be installed. When the push rod reaches its limit position or the load exceeds a certain value of the rated thrust, the push rod will automatically cut off the power supply to protect the motor and other components from damage. However, it must not be used as a limit switch during normal operation. Therefore, an external travel limit switch device is required to be configured on the machine. Our factory can configure photoelectric proximity switches for users to control the normal start and stop of the push rod.

[0031] Example 2

[0032] This embodiment is a further optimization based on Embodiment 1, specifically:

[0033] The aforementioned push rod power transmission telescopic assembly is a two-layered push rod power transmission telescopic assembly, comprising a first-layer push rod assembly 10 and a second-layer push rod assembly 9 sleeved inside the first-layer push rod assembly 10. An inner support sleeve 8 located above the drive mechanism 2 is provided inside the second-layer push rod assembly 9. A second-layer hollow transmission rod 7 is provided at the center of the inner support sleeve 8. The upper end of the second-layer hollow transmission rod 7 extends out of the inner support sleeve 8 and is fixedly connected to a second-layer push rod threaded sleeve 11. The second-layer push rod threaded sleeve 11 is threadedly engaged with the inner wall of the second-layer push rod assembly 9. A first-layer transmission shaft 6 capable of vertical movement is provided inside the second-layer hollow transmission rod 7. The upper end of the first-layer transmission shaft 6 sequentially extends out to the second-layer push rod threaded sleeve 11 and the second-layer push rod assembly 9, which are connected to the first-layer push rod threaded sleeve 12. The first-layer push rod threaded sleeve 12 is threadedly connected to the inner wall of the first-layer push rod assembly 10.

[0034] The first-layer push rod assembly 10 includes a hollow first-layer push rod and a first-layer push rod sleeve disposed on top of the first-layer push rod.

[0035] The second-layer push rod assembly 9 includes a hollow second-layer push rod and a second-layer push rod sleeve disposed on top of the second-layer push rod.

[0036] The first-layer push rod threaded sleeve 12 is locked onto the first-layer drive shaft 6 by a locking assembly 13, which is a locking bolt.

[0037] The first-layer drive shaft 6 is axially provided with protruding columns or protruding strips, and the second-layer hollow drive rod 7 is axially provided with grooves that cooperate with the protruding columns or protruding strips. The first-layer drive shaft 6 can reciprocate up and down in the second-layer hollow drive rod 7.

[0038] The drive mechanism 2 includes an independent support and protection frame and a motor 3 set in the independent support and protection frame. The output shaft 5 of the motor 3 extends out of the independent support and protection frame and passes through the inner support sleeve 8 to be keyed to the second hollow transmission rod 7.

[0039] In this embodiment, the external upper pressure first acts on the first-layer push rod sleeve, then presses down through the first-layer push rod threaded sleeve to the second-layer push rod sleeve, then sequentially presses down to the second-layer push rod threaded sleeve, the inner support sleeve, and the independent support protection frame, finally being transmitted to the base; the external upper pulling force first acts on the first-layer push rod sleeve, then pulls up through the first-layer push rod threaded sleeve to the second-layer push rod sleeve, then through the second-layer hollow transmission rod and the lower fastening bolt of the second-layer hollow transmission shaft, pulling up to the independent support protection frame, and then being transmitted from the independent support protection frame to the base; in summary, the push and pull forces of this invention will not be applied to the motor and motor shaft, effectively protecting the motor and improving its load-bearing capacity. Therefore, the motor only outputs rotational power and does not bear downward pressure or upward pulling force.

[0040] Example 3

[0041] This embodiment is a further optimization based on Embodiment 1, specifically:

[0042] Below the first-layer push rod threaded sleeve 12, a flat pressure bearing A14 is provided and sleeved on the first-layer transmission shaft 6. The flat pressure bearing A14 is located above the second-layer push rod assembly 9. Below the second-layer push rod threaded sleeve 11, a flat pressure bearing B15 is provided and sleeved on the second-layer hollow transmission rod 7. The flat pressure bearing B15 is located above the inner support sleeve 8. At the top of the independent support protection frame, a flat pressure bearing C4 is provided and sleeved on the output shaft 5 of the motor 3.

[0043] The second-layer push rod assembly 9 has an anti-rotation protrusion (or strip) on its outer wall, the first-layer push rod assembly 10 has an anti-rotation groove that mates with the anti-rotation protrusion (or strip) on its inner wall, the inner support sleeve 8 has an anti-rotation protrusion (or strip) on its inner wall, and the second-layer push rod assembly 9 has an anti-rotation groove that mates with the corresponding anti-rotation protrusion (or strip) on its inner wall.

[0044] In this embodiment, a flat pressure bearing A is provided below the first layer push rod threaded sleeve and sleeved on the first layer transmission shaft; a flat pressure bearing B is provided below the second layer push rod threaded sleeve and sleeved on the second layer hollow transmission rod; and a flat pressure bearing C is provided at the top of the independent support protection frame and sleeved on the output shaft of the motor. The arrangement of flat pressure bearings A, B, and C can reduce friction during transmission, thereby effectively reducing the wear of related components.

Claims

1. A functional motor built-in high-load and long-stroke drag shell push rod, comprising a base (1) and a driving mechanism arranged on the base (1), characterized in that: The base (1) is provided with multiple layers of push rod power transmission telescopic assemblies which are sequentially sleeved, and the driving mechanism is nested inside the push rod power transmission telescopic assemblies and drives the push rod power transmission telescopic assemblies to move up and down; the push rod power transmission telescopic assemblies are two-layer sleeved push rod power transmission telescopic assemblies, and the push rod power transmission telescopic assemblies include a first-layer push rod assembly (10) and a second-layer push rod assembly (9) sleeved inside the first-layer push rod assembly (10), and the second-layer push rod assembly (9) is provided with an inner assemblies located above the driving mechanism (2). A support sleeve (8) is provided at the center of the inner support sleeve (8) with a second-layer hollow transmission rod (7). The upper end of the second-layer hollow transmission rod (7) extends out of the inner support sleeve (8) and is fixedly connected with a second-layer push rod threaded sleeve (11). The second-layer push rod threaded sleeve (11) is threadedly matched with the inner wall of the second-layer push rod assembly (9). The second-layer hollow transmission rod (7) is provided with a first-layer transmission shaft (6) capable of being lifted up and down. The upper end of the first-layer transmission shaft (6) extends out of the second-layer push rod threaded sleeve (11) in sequence. The second-layer push rod assembly (9) is connected with The first-layer push rod threaded sleeve (12) is threadedly connected to the inner wall of the first-layer push rod assembly (10). The driving mechanism (2) includes a functional motor (3) and an independent support protection frame arranged on the outside of the functional motor (3). The upper and lower ends of the independent support protection frame are respectively fixedly connected to the base (1) and the inner support sleeve (8). The output shaft (5) of the functional motor (3) extends out of the independent support protection frame and passes through the inner support sleeve (8) to be plug-in-type connected to the second-layer hollow transmission rod (7); the first-layer push rod threaded sleeve (12) is threadedly connected to the inner wall of the first-layer push rod assembly (10). The driving mechanism (2) includes a functional motor (3) and an independent support protection frame arranged on the outside of the functional motor (3). The upper and lower ends of the independent support protection frame are respectively fixedly connected to the base (1) and the inner support sleeve (8). The output shaft (5) of the functional motor (3) extends out of the independent support protection frame and passes through the inner support sleeve (8) to be plug-in-type connected to the second-layer hollow transmission rod (7). A flat pressure bearing A (14) sleeved on the first-layer transmission shaft (6) is arranged below the rod threaded sleeve (12), and the flat pressure bearing A (14) is located above the second-layer push rod assembly (9). A flat pressure bearing B (15) sleeved on the second-layer hollow transmission rod (7) is arranged below the second-layer push rod threaded sleeve (11), and the flat pressure bearing B (15) is located above the inner support sleeve (8). A flat pressure bearing C (4) sleeved on the output shaft (5) of the motor (3) is arranged at the top of the independent support protection frame.

2. A functional motor built-in high load and long stroke drag shell push rod according to claim 1, characterized in that: The first-layer push rod assembly (10) comprises a hollow first-layer push rod and a first-layer push rod sleeve arranged on the top of the first-layer push rod.

3. The functional motor built-in high load and long stroke drag shell push rod according to claim 1, characterized in that: The second-layer push rod assembly (9) comprises a hollow second-layer push rod and a second-layer push rod sleeve arranged on the top of the second-layer push rod.

4. The functional motor built-in high load and long stroke drag shell push rod according to claim 1, characterized in that: The first-layer push rod threaded sleeve (12) is locked on the first-layer transmission shaft (6) through a locking component (13), and the locking component (13) is a locking bolt.

5. The functional motor built-in high load and long stroke drag shell push rod according to claim 1, characterized in that: The first-layer transmission shaft (6) is axially provided with a protruding column or a protruding strip, and the second-layer hollow transmission rod (7) is axially provided with a groove that matches the protruding column or the protruding strip. The first-layer transmission shaft (6) can reciprocate up and down on the second-layer hollow transmission rod (7).

6. The functional motor built-in high load and long stroke drag shell push rod according to claim 1, characterized in that: The outer wall of the second-layer push rod assembly (9) is provided with an anti-rotation protrusion block, the inner wall of the first-layer push rod assembly (10) is provided with an anti-rotation groove that cooperates with the anti-rotation protrusion block, the inner support sleeve (8) is provided with an anti-rotation protrusion block, and the inner wall of the second-layer push rod assembly (9) is provided with an anti-rotation groove that cooperates with the corresponding anti-rotation protrusion block (or strip).

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