Electric three-section type lifter

Abstract

The electric three-section type lifter comprises a lead screw assembly, an outer pipe, a middle pipe and an inner pipe, the outer pipe, the middle pipe and the inner pipe are sequentially sleeved from inside to outside, the lead screw assembly is driven by a driving device to enable the middle pipe to slide relative to the outer pipe and the inner pipe to slide relative to the middle pipe to achieve height adjustment, a lower end plate is arranged at the bottom end of the outer pipe, and an upper end plate is arranged at the top of the inner pipe. The top of the outer pipe and the top of the middle pipe are each provided with a dustproof sheath, the lead screw assembly comprises an inner screw assembly, a middle screw assembly and an outer screw assembly which are sequentially arranged from inside to outside in a sleeving mode, the driving device comprises a motor which is arranged on the lower end plate and drives the inner screw assembly to rotate, and a connecting mechanism is installed in the middle pipe. The inner screw assembly is in spiral connection with the connecting mechanism and in spline connection with the middle screw assembly, the middle screw assembly is rotationally connected with the connecting mechanism and in spiral connection with the outer screw assembly, and the outer screw assembly is fixedly connected with the upper end plate. The electric three-section type lifter provided by the utility model has good sealing performance and lifting stability.

Description

Technical Field

[0001] The utility model relates to an electric three-section lifter, belonging to the technical field of lifting equipment. Background Art

[0002] Three-section lifters are widely used in lifting tables, tatami mats and other equipment due to their better stability and stability. However, the existing three-section lifters have poor sealing performance, and it is difficult to ensure the synchronous sliding and lifting between the moving tubes during lifting, which affects their stability and service life. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide an electric three-section lifter with good sealing performance and lifting stability, which can solve the shortcomings of the existing technology.

[0004] The technical solution of the utility model is: an electric three-section lifter, comprising an outer tube, a middle tube, and an inner tube which are sequentially sleeved from the inside to the outside. The outer tube is a fixed tube located at the bottom, and is provided with a screw assembly connected to the middle tube and the inner tube. The screw assembly is driven by a driving device to make the middle tube relative to the outer tube and the inner tube relative to the middle tube slide to achieve height adjustment. The bottom end of the outer tube is provided with a lower end plate, and the top of the inner tube is provided with an upper end plate. The tops of the outer tube and the middle tube are both provided with dustproof sleeves. The screw assembly comprises an inner screw assembly, a middle screw assembly, and an outer screw assembly which are sequentially sleeved from the inside to the outside. The driving device includes a motor provided on the lower end plate for driving the inner screw assembly to rotate. A connecting mechanism is installed in the middle tube. The inner screw assembly is spirally connected to the connecting mechanism and splined to the middle screw assembly. The middle screw assembly is rotatably connected to the connecting mechanism and spirally connected to the outer screw assembly, and the outer screw assembly is fixedly connected to the upper end plate.

[0005] Furthermore, wear-resistant sliding sheets are provided between the outer tube and the middle tube, and between the middle tube and the inner tube.

[0006] Furthermore, the outer tube, middle tube and inner tube are all hollow profiles.

[0007] Furthermore, the outer tube, the middle tube and the inner tube are rectangular, the outer sides of the corners are chamfered and the inner sides are provided with thickened parts.

[0008] Furthermore, the thickened portion has a through hole, and the dustproof sleeve is connected and fixed to the through hole by screws.

[0009] Furthermore, the motor is a Hall motor with a Hall element.

[0010] By implementing the utility model, when the motor drives the inner screw assembly to rotate, the middle tube and the middle screw assembly are driven to rise and fall. At the same time, the middle screw assembly rotates synchronously with the inner screw assembly, driving the outer screw assembly and the outer tube to rise and fall, so that the middle tube is lifted and lowered relative to the outer tube, and the inner tube is lifted and lowered relative to the middle tube synchronously, thereby improving the lifting stability. At the same time, a lower end plate is provided at the bottom end of the outer tube, and an upper end plate is provided at the top of the inner tube. Dustproof covers are provided on the tops of the outer tube and the middle tube, thereby improving the sealing of the lifter and better preventing the entry of foreign matter such as dust. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a three-dimensional schematic diagram of the utility model in the extended state;

[0012] Figure 2 It is a cross-sectional view of the utility model in the extended state;

[0013] Figure 3 Schematic diagram of the middle tube.

[0014] As shown in the figure: outer tube 1; middle tube 2; inner tube 3; lower end plate 4; upper end plate 5; dust cover 6; inner screw assembly 7; middle screw assembly 8; outer screw assembly 9; motor 10; fixing plate 11; second slide 12; thickened portion 13; through hole 14; first slide 15. DETAILED DESCRIPTION

[0015] The embodiment of the present utility model: Figures 1 to 3As shown, an electric three-section lifter includes an outer tube 1, a middle tube 2, and an inner tube 3 which are sequentially sleeved from the inside to the outside. The outer tube 1 is a fixed tube located at the bottom, and is provided with a screw assembly connected to the middle tube 2 and the inner tube 3. The bottom end of the outer tube 1 is provided with a lower end plate 4, and the top of the inner tube 2 is provided with an upper end plate 5. The tops of the outer tube 1 and the middle tube 2 are both provided with dustproof sleeves 6. The screw assembly includes an inner screw assembly 7, a middle screw assembly 8, and an outer screw assembly 9 which are sequentially sleeved from the inside to the outside. The driving device includes a device The motor 10 drives the inner screw assembly 7 to rotate on the lower end plate 4. The outer surfaces of the inner screw assembly 7 and the middle screw assembly 8 have threads. The top of the inner screw assembly 7 has an external spline. A connecting mechanism is installed in the middle tube 2. The connecting mechanism includes a fixed plate 11 fixed in the middle tube 2. The fixed plate 11 is spirally connected to the inner screw assembly 7. The bottom end of the middle screw assembly 8 is connected to the fixed plate 11 through a bearing. The middle screw assembly 8 has an internal spline connected to the external spline of the inner screw assembly 7, so that The inner screw assembly 7 is spline-connected with the middle screw assembly 8. The inner screw assembly 7 and the middle screw assembly 8 rotate synchronously and can slide axially at the same time. The top of the outer screw assembly 8 is fixed to the upper end plate 5, and the lower end has a nut spirally connected to the middle screw assembly 8. When working, the motor 10 drives the inner screw assembly 7 to rotate, driving the middle tube 2 and the middle screw assembly 8 to rise and fall synchronously. At the same time, the middle screw assembly 8 rotates synchronously with the inner screw assembly 7, driving the outer screw assembly 9 and the inner tube 3 to rise and fall, realizing that the middle tube 2 is lifted relative to the outer tube 1 and the inner tube 3 is lifted relative to the middle tube 2 synchronously, improving the lifting stability. At the same time, the bottom end of the outer tube 1 is provided with a lower end plate 4, and the top of the inner tube 3 is provided with an upper end plate 4, which closes the upper and lower ends of the lifter. The tops of the outer tube 1 and the middle tube 2 are both provided with dustproof sleeves 6, which close the gaps between the outer tube 1 and the middle tube 2, and the gaps between the middle tube 2 and the inner tube 3, so that the sealing of the lifter is improved, and the entry of foreign matter such as dust is better prevented, thereby playing a role in protecting internal components.

[0016] As a preferred embodiment, wear-resistant sliding plates are provided between the outer tube 1 and the middle tube 2, and between the middle tube 2 and the inner tube 3. Specifically, sliding plates 15 are provided on the inner wall of the outer tube 1 and the inner wall of the middle tube 2, and sliding plates 2 12 are provided on the outer wall of the middle tube 2 and the outer wall of the inner tube 3. The sliding plates 15 on the inner wall of the outer tube 1 and the sliding plates 2 12 on the outer wall of the middle tube 2 are distributed up and down, and the sliding plates 15 on the inner wall of the middle tube 2 and the sliding plates 2 12 on the outer wall of the inner tube 3 are distributed up and down. Mounting holes are provided on the outer tube 1, the middle tube 2 and the inner tube 3. The sliding plates 15 and the sliding plates 2 12 are installed by snapping into the mounting holes to achieve close fit, thereby preventing the middle tube 2 and the inner tube 3 from shaking during lifting and lowering, thereby improving stability.

[0017] As a preferred embodiment, the outer tube 1, the middle tube 2 and the inner tube 3 are all hollow metal profiles formed by extrusion of aluminum alloy. They are light in weight, high in strength, and have excellent precision, which facilitates accurate fitting and installation.

[0018] As a preferred embodiment, the outer tube 1, the middle tube 2 and the inner tube 3 are rectangular, and the outer sides of the corners are chamfered so that they are not sharp enough to injure the user. A thickened portion 13 is provided on the inner side to enhance the strength of the corners.

[0019] As a preferred embodiment, the thickened portion 13 has a through hole 14, which is a cavity generated during the extrusion molding of the pipe and does not require subsequent processing. The dustproof sleeve 6 is connected and fixed to the through hole 14 by screws, so that the dustproof sleeve 6 is firmly installed. At the same time, the lower end plate 4 and the upper end plate 5 are also connected to the through hole 14 by screws and are firmly installed on the outer tube 1 and the inner tube 3.

[0020] As a preferred embodiment, the motor 10 is a Hall motor with a Hall element. The Hall element can accurately sense the movement state of the motor and can also realize stroke control. Combined with the stroke switch installed in the product, a dual control system is realized, which has a wider range of applications.

Claims

1. An electric three-section lifter, comprising an outer tube, a middle tube, and an inner tube, which are sequentially sleeved from the inside out. The outer tube is a fixed tube located at the bottom, and is provided with a screw assembly connected to the middle tube and the inner tube. The screw assembly is driven by a drive device to slide the middle tube relative to the outer tube and the inner tube relative to the middle tube to achieve height adjustment. The characteristics are: The bottom end of the outer tube is provided with a lower end plate, the top of the inner tube is provided with an upper end plate, the tops of the outer tube and the middle tube are both provided with dustproof sleeves, the screw assembly includes an inner screw assembly, a middle screw assembly, and an outer screw assembly which are sequentially arranged from the inside to the outside, the driving device includes a motor provided on the lower end plate for driving the inner screw assembly to rotate, a connecting mechanism is installed in the middle tube, the inner screw assembly is spirally connected to the connecting mechanism and splined to the middle screw assembly, the middle screw assembly is rotatably connected to the connecting mechanism and spirally connected to the outer screw assembly, and the outer screw assembly is fixedly connected to the upper end plate.

2. The electric three-section lifter according to claim 1, characterized in that: Wear-resistant sliding sheets are provided between the outer tube and the middle tube, and between the middle tube and the inner tube.

3. The electric three-section lifter according to claim 1 or 2, characterized in that: The outer tube, middle tube and inner tube are all hollow profiles.

4. The electric three-section lifter according to claim 3, characterized in that: The outer tube, the middle tube and the inner tube are rectangular, the outer sides of the corners are chamfered and the inner sides are provided with thickened parts.

5. The electric three-section lifter according to claim 4, characterized in that: The thickened portion has a through hole, and the dustproof sleeve is connected and fixed to the through hole by screws.

6. The electric three-section lifter according to claim 1, characterized in that: The motor is a Hall motor with a Hall element.

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