Linear actuator

Abstract

The invention discloses a linear actuator, comprising an outer tube structure, a medium tube structure and an inner tube structure which are all of hollow polygonal tubular shapes. The outer tube is used for the medium tube and the inner tube to penetrate and clamp each other by spacing and is internally provided with a thrust gear and at least a tension adjusting device; the thrust gear is provided with a screw rod and a floating nut matching each other by a screw; the floating nut is combined with a pushing post and is pushed by the screw rod; a pulley is arranged at the top of the pushing post to support a drawing-supporting component by pushing; both ends of the drawing-supporting component are fixedly connected between the inner tube and the outer tube; another drawing-supporting component is arranged between the medium tube and the inner tube; the drawing-supporting component crosses the pulley; the tension of the drawing-supporting component is changed after being drawn by the tension adjustment device so that axial expansion and movement among tubes are stabler and more reliable.

Description

technical field [0001] The present invention relates to a linear actuator, in particular to a linear actuator that can limit each other when stretching and stretching, stabilize the axial telescopic displacement, and adjust the pre-force and tension of the movement between the tubes by means of a tension adjustment device. transmission. Background technique [0002] According to the current application range of linear actuators is quite wide, mainly using motors to drive other mechanisms to expand and contract. Examples of known linear actuator technologies: [0003] Please refer to US Patent No. US 6880416 and see figure 1 , figure 2 As shown, the linear actuator 90 is provided with three-section telescopic tubes 91, 92, 93, and a motor 94 is arranged inside the three-section telescopic tubes 91, 92, 93, and the motor 94 drives a screw structure 95, The screw structure 95 is provided with three screws 96, 97, 98, the three screws 96, 97, 98 are respectively connected wi...

AI Technical Summary

Problems solved by technology

[0005] 1. The pre-force between the rods cannot be adjusted during the action process between the screws: the screw rods 96, 97, 98 of the overall structure push the telescopic tubes 91, 92, 93 of the linear actuator 90 respectively, and the threads between the rods The matching state is fixed. When there is looseness, the rods cannot be properly adjusted to produce different pre-forces, and there will be an increasingly loose state. Therefore, it is difficult to meet the adjustment requirements in terms of structure.

[0006] 2. Complex structure and inconvenient assembly: the three screw rods 96, 97, 98 respectively push the telescopic tubes 91, 92, 93 of the linear actuator 90, and the three-stage screw structure system results in the construction of the linear actuator 90 Complicated and inconvenient to assemble

[0007] 3. High cost: the telescopic tubes 91, 92, and 93 of the above-mentioned linear actuator 90 are respectively connected with three screws 96, 97, and 98. The structural design of such three screws 96, 97, and 98 makes the linear actuator The cost of device 90 increases

[0010] 1. There is no adjustment function for the movement between the tubes, which may easily cause internal damage: the mutual influence of the three-section telescopic tubes 81, 82, 83 is still driven by the structure of the inner and outer screw sleeves of the internal screw rod 85, and the screw connection The driven design still has the lack of the previous plan, and there will be more and more looseness between each other, unable to meet the needs of adjustment

[0011] 2. The structure is easy to be damaged when rotating: the three-section telescopic tubes 81, 82, and 83 are designed as circular tubes, and the circular tube-shaped three-section telescopic tubes 81, 82, 83 have no clamping limit structure, so the design is easy When the motor 84 drives the screw 85 to rotate, the internal structure will be damaged due to axial rotation friction, which does not meet the practical purpose and convenience

[0012] 3. Interlocking will interfere with each other: the screw 85 is displaced by the pulley 86 on the top of the pole, and the chain drives the telescopic tube 83 to sequentially link the telescopic tube 82 and other structures. Moreover, there is still a gap between the bottom of the telescopic tube 82 and the screw 85. The structure of mutual positioning restriction produces unnecessary interference in the process of the structure of positioning restriction and the chain pulling process, which is very easy to move, and has a negative impact on the overall expansion and contraction operation, so there is a need for improvement

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