Electric push rod for lifting table

Abstract

The utility model relates to the technical field of electric push rods, in particular to an electric push rod for a lifting table, which comprises a shell, an outer tube, an inner tube, a lifting motor and a screw rod, the screw rod is rotatably connected in the inner tube, a limiting block is arranged at the right end of the screw rod and slides in the inner tube, and the lifting motor is arranged in the shell. The inner pipe slides in the outer pipe, the lifting motor is arranged on the front side of the shell, the outer pipe is arranged on the right side of the shell, a stabilizing piece used for stabilizing sliding of the inner pipe is arranged in the inner pipe, and a driving piece used for driving the screw to rotate is arranged in the shell. According to the electric push rod for the lifting table, when the screw rotates to push the stabilizing block to slide rightwards, under sudden pushing, the stabilizing block can drive the multiple fixing blocks to slide rightwards, the fixing blocks extrude and drive the multiple springs to deform, work of the electric push rod can be stabilized through deformation of the springs, and the device is prevented from vibrating under sudden impact force.

Description

Technical Field

[0001] This utility model relates to the field of electric linear actuator technology, specifically an electric linear actuator for a height-adjustable table. Background Technology

[0002] An electric linear actuator is a mechanical device that converts the rotary motion of a motor into linear reciprocating motion. It is widely used in smart homes, medical equipment, industrial machinery and other fields. The motor drives a lead screw / gear transmission to convert the rotary motion of the motor into the linear reciprocating motion of the actuator, thereby driving the table to rise and fall smoothly.

[0003] In the prior art, such as the electric linear actuator disclosed in CN204633523U, the extension and retraction stroke of the inner tube is controlled by a limit switch. When the motor drives the inner tube to the limit position of the stroke, the limit switch controls the motor to stop immediately and automatically. The stroke control is precise and does not waste excess power resources.

[0004] When the lifting motor drives the lead screw to rotate and push the inner tube to slide, the sudden sliding of the inner tube caused by the rotation of the lead screw at the moment of device start-up will cause the electric actuator to vibrate at the moment of start-up and stop-up. This vibration reduces the stability of the electric actuator. Since the meshing surface between the worm gear and the worm is gradually increased and the friction between the two is dynamic friction, the meshing surface that drives the worm gear to rotate is subjected to a large load. The sudden impact force will also cause rapid wear of the internal structure. Therefore, we propose an electric actuator for lifting tables. Utility Model Content

[0005] One of the technical problems this application aims to solve is that the electric actuator vibrates during the start-up and shutdown of the lifting motor, which increases the wear rate of the internal structure.

[0006] To address the aforementioned technical problems, this application provides an electric push rod for a height-adjustable desk, comprising a housing, an outer tube, an inner tube, a lifting motor, and a screw. The screw is rotatably connected inside the inner tube, and a limit block is provided at the right end of the screw. The limit block slides inside the inner tube, and the inner tube slides inside the outer tube. The lifting motor is located on the front side of the housing, and the outer tube is located on the right side of the housing. A stabilizing element for stabilizing the sliding of the inner tube is provided inside the inner tube, and a driving element for driving the screw to rotate is provided inside the housing.

[0007] Preferably, the stabilizing component includes a stabilizing block that slides on the left side of the inner wall of the inner tube. The inner tube has a groove inside. The outer wall of the stabilizing block is provided with a plurality of evenly distributed fixing blocks. A spring is provided in the middle of the fixing block. The fixing block slides inside the groove. The left and right ends of the spring are both provided on the inner wall of the groove. The stabilizing block is threadedly connected to the outer wall of the screw.

[0008] Preferably, the driving component includes a first rotating wheel and a worm gear rotatably connected inside the housing. The outer wall of the first rotating wheel is rotatably connected to a plurality of evenly distributed second rotating wheels. The second rotating wheels mesh with the lower part of the worm gear. The left end of the screw is located in the middle of the first rotating wheel, and the front end of the worm gear is located at the driving end of the lifting motor.

[0009] Preferably, the worm is spindle-shaped, narrow in the middle and wide at both ends, with its meshing surfaces arranged along the surface of the worm, and the distance between the meshing surfaces being the arc-shaped distance between two adjacent rotating wheels.

[0010] Preferably, a limiting plate is provided at the left end of the inner tube, and the limiting plate slides inside the outer tube.

[0011] Preferably, a fixing plate one is provided on the left side of the shell, and a fixing plate two is provided on the right end of the inner tube.

[0012] Preferably, the fixed block is internally slidably connected with a baffle and a slide rod, the baffle is disposed in the middle of the slide rod, the slide rod is disposed inside the slide groove, and the interior of the fixed block is filled with hydraulic oil.

[0013] This utility model has at least the following beneficial effects:

[0014] 1. When the screw rotates and pushes the stabilizing block to slide to the right, under the sudden push, the stabilizing block will drive multiple fixed blocks to slide to the right. The fixed blocks squeeze and cause multiple springs to deform. The deformation of the springs can stabilize the operation of the electric actuator and prevent the device from vibrating under sudden impact.

[0015] 2. Due to the spindle-shaped design of the worm, multiple rotating wheels can mesh simultaneously on the meshing surface of the worm. This allows the multiple rotating wheels to distribute the pressure on the worm, and the rotation of the rotating wheels can reduce the dynamic friction between the rotating wheels and the worm. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the limiting block structure of this utility model;

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

[0019] Figure 4 This is a schematic diagram of the second rotating wheel structure of this utility model;

[0020] Figure 5 This is a schematic diagram of the structure of Embodiment 2 of this utility model.

[0021] In the diagram: 1. Shell; 11. Outer tube; 12. Inner tube; 13. Lifting motor; 14. Screw; 141. Limiting block; 15. Fixing plate one; 2. Stabilizing component; 21. Stabilizing block; 121. Fixing plate two; 122. Limiting plate; 22. Fixing block; 23. Spring; 24. Slide groove; 25. Slide rod; 26. Baffle; 3. Driving component; 31. Worm gear; 32. Rotary wheel one; 33. Rotary wheel two. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Example 1: Please refer to Figure 1-4 This utility model provides a technical solution: an electric push rod for a height-adjustable table, including a housing 1, an outer tube 11, an inner tube 12, a lifting motor 13, and a screw 14. The screw 14 is rotatably connected inside the inner tube 12. A limit block 141 is provided at the right end of the screw 14. The limit block 141 slides inside the inner tube 12. The inner tube 12 slides inside the outer tube 11. The lifting motor 13 is located on the front side of the housing 1, and the outer tube 11 is located on the right side of the housing 1. A stabilizing member 2 for stabilizing the sliding of the inner tube 12 is provided inside the inner tube 12. A driving member 3 for driving the screw 14 to rotate is provided inside the housing 1.

[0024] The housing 1 serves as the outer shell of the device, protecting the internal structure from external interference. The outer tube 11 provides sliding support for the inner tube 12, allowing the inner tube 12 to slide out of the outer tube 11. The screw 14 is used to drive the inner tube 12 to slide. The limiting block 141 is used to prevent the inner tube 12 from sliding excessively and slipping off the outer wall of the screw 14.

[0025] Furthermore, the stabilizer 2 includes a stabilizing block 21 that slides on the left side of the inner wall of the inner tube 12. The inner tube 12 has a groove 24 inside. The outer wall of the stabilizer 21 is provided with a plurality of evenly distributed fixing blocks 22. A spring 23 is provided in the middle of the fixing block 22. The fixing block 22 slides inside the groove 24. The left and right ends of the spring 23 are both provided on the inner wall of the groove 24. The stabilizer 21 is threaded to the outer wall of the screw 14.

[0026] The stabilizing block 21 can be pushed and moved by the screw 14, which in turn moves the inner tube 12. The fixing block 22 provides support for the installation of the spring 23. When the screw 14 suddenly rotates, the spring 23 can absorb the impact force and contract, and then push the inner tube 12 to slide. The slide groove 24 provides the sliding space for the fixing block 22 and the installation space for the spring 23. When the screw 14 suddenly rotates, the stabilizing block 21 is pushed and moved by the threaded connection, which drives the fixing block 22 to slide in the slide groove 24. The spring 23 is compressed and contracts, absorbing the instantaneous impact force generated by the rotation of the screw 14, and preventing the inner tube 12 from displacement deviation or structural damage due to rigid collision. After the impact force is absorbed, the spring 23 releases elastic potential energy, pushes the fixing block 22 to slide along the slide groove 24, and then drives the stabilizing block 21 and the inner tube 12 to move smoothly.

[0027] Furthermore, the driving component 3 includes a first rotating wheel 32 and a worm gear 31 rotatably connected inside the housing 1. The outer wall of the first rotating wheel 32 is rotatably connected to a plurality of evenly distributed second rotating wheels 33. The second rotating wheels 33 mesh with the lower part of the worm gear 31. The left end of the screw 14 is located in the middle of the first rotating wheel 32, and the front end of the worm gear 31 is located at the driving end of the lifting motor 13.

[0028] Furthermore, the worm 31 is spindle-shaped, narrow in the middle and wide at both ends, and its surface meshing surfaces are arranged along the surface of the worm 31. The distance between the surface meshing surfaces is the arc-shaped distance between two adjacent rotating wheels 33.

[0029] Rotating wheel 32 can be driven to rotate by rotating wheel 33. Rotating wheel 33 can mesh with the surface of worm 31. When worm 31 rotates, it can drive rotating wheel 33 to rotate while simultaneously driving rotating wheel 32 to rotate. Due to the spindle-shaped design of worm 31, multiple rotating wheels 33 can mesh simultaneously on the meshing surface of worm 31. This allows multiple rotating wheels 33 to distribute the pressure of worm 31. At the same time, the rotation of rotating wheels 33 can reduce the dynamic friction between rotating wheels 33 and worm 31.

[0030] Furthermore, a limiting plate 122 is provided at the left end of the inner tube 12, and the limiting plate 122 slides inside the outer tube 11;

[0031] The limiting plate 122 is used to prevent the inner tube 12 from being rotated by the stabilizing block 21 when sliding.

[0032] Furthermore, a fixing plate 15 is provided on the left side of the shell 1, and a fixing plate 121 is provided on the right end of the inner tube 12.

[0033] Fixing plate 15 and fixing plate 2121 are the two mounting points of the device.

[0034] Example 2: Please refer to Figure 5 Based on Embodiment 1, this utility model provides another technical solution: a baffle 26 and a slide rod 25 are slidably connected inside the fixing block 22. The baffle 26 is located in the middle of the slide rod 25, the slide rod 25 is located inside the slide groove 24, and the inside of the fixing block 22 is filled with hydraulic oil.

[0035] The fixing block 22 is a hollow structure, and its internal baffle 26 divides the interior of the fixing block 22 into two cavities. When the baffle 26 moves, it can squeeze the hydraulic oil inside the fixing block 22, so that the hydraulic oil flows from one side of the fixing block 22 to the other side through the hole in the middle of the baffle 26. The slide rod 25 is the support for installing and pushing the baffle 26. When the screw 14 rotates and pushes the stabilizing block 21 to slide to the right, the stabilizing block 21 first carries the fixing block 22 to slide to the right. At this time, the baffle 26 can squeeze the hydraulic oil inside the fixing block 22, so that the hydraulic oil enters the other side of the fixing block 22 through the hole on the surface of the baffle 26, thereby slowly releasing the impact force on the fixing block 22.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. An electric push rod for a height-adjustable table, comprising a housing (1), an outer tube (11), an inner tube (12), a lifting motor (13), and a screw (14), characterized in that: The screw (14) is rotatably connected inside the inner tube (12). A limit block (141) is provided at the right end of the screw (14). The limit block (141) slides inside the inner tube (12). The inner tube (12) slides inside the outer tube (11). The lifting motor (13) is located on the front side of the housing (1). The outer tube (11) is located on the right side of the housing (1). A stabilizing element (2) for stabilizing the sliding of the inner tube (12) is provided inside the inner tube (12). A driving element (3) for driving the screw (14) to rotate is provided inside the housing (1).

2. The electric push rod for a height-adjustable table according to claim 1, characterized in that: The stabilizer (2) includes a stabilizing block (21) that slides on the left side of the inner wall of the inner tube (12). The inner tube (12) has a groove (24) inside. The outer wall of the stabilizer (21) is provided with a plurality of evenly distributed fixing blocks (22). A spring (23) is provided in the middle of the fixing block (22). The fixing block (22) slides inside the groove (24). The left and right ends of the spring (23) are both provided on the inner wall of the groove (24). The stabilizer (21) is threaded to the outer wall of the screw (14).

3. The electric push rod for a height-adjustable table according to claim 1, characterized in that: The driving component (3) includes a first rotating wheel (32) and a worm gear (31) rotatably connected inside the housing (1). The outer wall of the first rotating wheel (32) is rotatably connected to a plurality of evenly distributed second rotating wheels (33). The second rotating wheels (33) mesh with the lower part of the worm gear (31). The left end of the screw (14) is located in the middle of the first rotating wheel (32). The front end of the worm gear (31) is located at the driving end of the lifting motor (13).

4. The electric push rod for a height-adjustable table according to claim 3, characterized in that: The worm (31) is spindle-shaped with a narrow middle and wide ends. Its surface meshing surfaces are arranged along the surface of the worm (31), and the distance between the surface meshing surfaces is the arc distance between two adjacent rotating wheels (33).

5. The electric push rod for a height-adjustable table according to claim 1, characterized in that: A limiting plate (122) is provided at the left end of the inner tube (12), and the limiting plate (122) slides inside the outer tube (11).

6. The electric push rod for a height-adjustable table according to claim 1, characterized in that: A fixing plate 1 (15) is provided on the left side of the shell (1), and a fixing plate 2 (121) is provided on the right end of the inner tube (12).

7. The electric push rod for a height-adjustable table according to claim 2, characterized in that: The fixed block (22) is internally slidably connected with a baffle (26) and a slide rod (25). The baffle (26) is located in the middle of the slide rod (25), and the slide rod (25) is located inside the slide groove (24). The fixed block (22) is filled with hydraulic oil.

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