Automatic lifting device suitable for vacuum closed environment

Abstract

The utility model discloses an automatic lifting device suitable for a vacuum closed environment, which comprises a support and an objective table, a jacking mounting plate and a self-locking lead screw are arranged in the support, a nut is sleeved on the outer side of the self-locking lead screw, the nut is fixedly connected with the jacking mounting plate, a servo motor is mounted on the support, a driving gear is sleeved on an output shaft of the servo motor, and the output shaft of the servo motor is fixedly connected with the objective table. A driven gear sleeves the end part of the bottom end of the self-locking lead screw, a transmission gear is arranged between the driving gear and the driven gear, a jacking shaft is mounted between the jacking mounting plate and the objective table, the bottom of the jacking shaft is fixed on the jacking mounting plate, the top of the jacking shaft penetrates through the top surface of the bracket and is fixedly connected with the bottom surface of the objective table, and a sealing corrugated pipe sleeves the outer side of the jacking shaft. According to the automatic lifting device, the objective table is arranged in the vacuum closed environment, and an external transmission system and the like are arranged in the atmospheric environment, so that the overall sealing performance of the vacuum closed environment is improved, and the automatic lifting device is suitable for the vacuum closed working environment.

Description

Technical Field

[0001] The utility model belongs to the technical field of lifting devices and relates to an automatic lifting device suitable for use in a vacuum-sealed environment. Background Art

[0002] The existing lifting platforms mainly include single-screw lifting platforms, double-screw lifting platforms and scissor-type lifting platforms. Single-screw lifting platforms drive the platform up and down by driving the single screw to rotate forward and backward; double-screw lifting platforms drive the platform up and down by driving the two screws to rotate forward and backward at the same time; scissor-type lifting platforms adopt a double scissor-type structure and are driven to rise and fall by hydraulic cylinders. These lifting platforms are mainly used under atmospheric pressure.

[0003] In current domestic research, automatic lifting platforms in vacuum-sealed environments play a vital role. The automatic lifting platform can achieve precise height adjustment without destroying the vacuum environment, ensuring that experimental equipment or production tools can accurately reach the predetermined position. The automatic lifting platform effectively prevents outside air from entering the vacuum environment through a good sealing design, maintains the stability of the vacuum degree, and the reliable sealing performance of the automatic lifting platform ensures the smooth progress of the experiment. At the same time, operators can debug and maintain equipment without destroying the vacuum environment, greatly improving work efficiency. Since the risks brought by frequent destruction of the vacuum environment, such as equipment damage and personal injury caused by vacuum leakage, are avoided, work safety is also improved. However, if these existing devices are used directly in a vacuum environment, the single-screw lifting platform and the double-screw lifting platform have the following problems:

[0004] The friction between the screw and the nut is large, which is prone to wear after long-term operation, resulting in poor sealing and is not suitable for vacuum-sealed working environments;

[0005] (2) The transmission efficiency is relatively low, which limits the operating speed of the lifting platform. In some situations where rapid lifting is required, it may not meet the requirements of production efficiency.

[0006] (3) Low positioning accuracy. Due to the limitations of its structure and transmission mode, it is often difficult to achieve high-precision positioning accuracy. At the same time, other devices are required to achieve self-locking.

[0007] (4) During operation, the single screw is prone to vibration and impact, which may affect the stability of the platform;

[0008] (5) Poor environmental adaptability. The screw thread has high requirements for the working environment. Under harsh environmental conditions, it is prone to corrosion and damage, which affects the service life of the equipment.

[0009] Scissor-type lifting platforms have poor stability due to their structural limitations and are difficult to seal. Utility Model Content

[0010] The purpose of the utility model is to provide an automatic lifting device suitable for use in a vacuum-sealed environment, which solves the problem that the existing lifting platform is poorly stable and causes vacuum leakage when used in a vacuum-sealed environment.

[0011] The technical solution adopted by the utility model is an automatic lifting device suitable for a vacuum-sealed environment, including a bracket and a loading platform, a lifting mounting plate and a self-locking screw are arranged inside the bracket, a nut is sleeved on the outer side of the self-locking screw, and the nut is fixedly connected to the lifting mounting plate, a servo motor is installed on the bracket, a driving gear is sleeved on the output shaft of the servo motor, a driven gear is sleeved on the bottom end of the self-locking screw, a transmission gear is arranged between the driving gear and the driven gear, a lifting shaft is installed between the lifting mounting plate and the loading platform, the bottom of the lifting shaft is fixed on the lifting mounting plate, the top passes through the top surface of the bracket, and is fixedly connected to the bottom surface of the loading platform, and a sealing bellows is sleeved on the outer side of the lifting shaft.

[0012] Among them, a linear guide rail is arranged inside the bracket, the slide rail in the linear guide rail is fixed on the side wall of the bracket, and the slider is fixedly connected to the jacking mounting plate.

[0013] Limit switches are provided at both ends of the linear guide rail travel.

[0014] Four linear guide rails are arranged inside the bracket.

[0015] The four linear guide rails are opposed to each other in pairs and are respectively located on two opposite sides of the jacking mounting plate.

[0016] Two self-locking screws are arranged inside the bracket, and the two self-locking screws are respectively located on the opposite ends of the jacking mounting plate.

[0017] The driven gear connected to the two self-locking screws is connected to the driving gear through the same transmission gear.

[0018] Three lifting shafts are installed between the lifting installation plate and the loading platform, and the midpoints of the three lifting shafts are distributed in a regular triangle.

[0019] Two sections of sealing bellows are provided on the outside of each lifting shaft, one section is located inside the bracket, and the other section is located between the bracket and the loading platform. One end of the sealing bellows located inside the bracket is sealed and fixedly connected to the top surface inside the bracket, and the other end is sealed and fixedly connected to the top surface of the lifting mounting plate. One end of the sealing bellows located between the bracket and the loading platform is sealed and fixedly connected to the bottom surface of the loading platform, and the other end is sealed and fixedly connected to the top surface outside the bracket. Sealing gaskets are installed at the connections of the sealing bellows.

[0020] The self-locking screw is a trapezoidal self-locking screw with an isosceles trapezoidal thread profile and a thread angle of 30°.

[0021] The beneficial effects of the utility model are as follows:

[0022] (1) By installing a lifting shaft between the bracket and the loading platform, a sealing bellows is provided on the outer side of the lifting shaft, a sealing ring is installed between the sealing bellows and the bracket, the top surface of the sealing bellows is sealed and fixedly connected to the bottom surface of the loading platform, and the bottom surface is sealed and fixedly connected to the top surface of the lifting mounting plate. When in use, the loading platform is placed in a vacuum-sealed environment, and the external transmission system is placed in the atmospheric environment, thereby improving the overall sealing of the vacuum-sealed environment and making the automatic lifting device suitable for a vacuum-sealed working environment;

[0023] (2) Gear transmission has high transmission efficiency and bearing capacity, which can widen the lifting rate of the lifting platform and meet the requirements of productivity under fast lifting conditions;

[0024] (3) By precisely controlling the rotation angle of the servo motor, the driving gear is controlled to rotate, thereby driving the transmission gear and the driven gear to rotate. The transmission gear can drive the self-locking screw to rotate at a stable transmission ratio, thereby achieving precise control of the height of the stage and high positioning accuracy.

[0025] (4) Four linear guide rails are installed on the bracket, and limit switches are provided at both ends of the linear guide rail travel. The slider of the linear guide rail is fixedly connected to the jacking mounting plate. The linear guide rail provides high linear motion accuracy, high rigidity and anti-torsion ability, ensuring the motion accuracy and stability on the jacking mounting plate, so that the platform can be lifted and lowered stably during operation;

[0026] (5) The self-locking screw prevents the stage from loosening or relative displacement when the stage is subjected to external force, and can also achieve a larger transmission ratio. Its self-locking feature prevents the stage from sliding down when there is no power drive;

[0027] (6) Good environmental adaptability. The threaded tube on the outside of the self-locking screw thread not only ensures sealing, but also isolates the thread from corrosion and damage by the external environment, thus extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a structural diagram of the automatic lifting device of the utility model suitable for use in a vacuum-sealed environment;

[0029] Figure 2 This is a three-dimensional structural diagram of the automatic lifting device of the utility model suitable for use in a vacuum-sealed environment;

[0030] Figure 3 It is a planar structural diagram of the automatic lifting device of the utility model which is suitable for use in a vacuum-sealed environment.

[0031] In the figure, 1. bracket, 2. loading platform, 3. lifting mounting plate, 4. linear guide, 5. self-locking screw, 6. nut, 7. servo motor, 8. driving gear, 9. driven gear, 10. transmission gear, 11. lifting shaft, 12. sealing bellows. DETAILED DESCRIPTION

[0032] The present invention will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0033] Example 1

[0034] An automatic lifting device suitable for use in vacuum-sealed environments, see Figure 1 , including a bracket 1 and a loading platform 2, a jacking mounting plate 3 and a self-locking screw 5 are provided inside the bracket 1, and a nut 6 is provided on the outside of the self-locking screw 5. The nut is screwed with the self-locking screw, so that the servo motor drives the loading platform to rise and fall, and the nut 6 is fixedly connected to the jacking mounting plate 3. A servo motor 7 is installed on the bracket 1, and a driving gear 8 is provided on the output shaft of the servo motor 7. A driven gear 9 is provided at the bottom end of the self-locking screw 5, and a transmission gear 10 is provided between the driving gear 8 and the driven gear 9. In this embodiment, the driving gear 8, the driven gear 9 and the transmission gear 10 are all spur gears. A jacking shaft 11 is installed between the jacking mounting plate 3 and the loading platform 2. The jacking mounting plate 3 is a double-layer plate structure, and the upper and lower layers are fixedly connected by bolts. The nut 6 is fixedly connected to the bottom plate of the jacking mounting plate 3. The bottom of the jacking shaft 11 is fixed to the top plate of the jacking mounting plate 3, and the top passes through the top surface of the bracket 1 and is fixedly connected to the bottom surface of the loading platform 2. A sealing bellows 12 is provided on the outside of the jacking shaft 11.

[0035] Example 2

[0036] An automatic lifting device suitable for use in a vacuum-sealed environment includes a bracket 1 and a loading platform 2. A lifting mounting plate 3 and a self-locking screw 5 are provided inside the bracket 1. A nut 6 is sleeved on the outer side of the self-locking screw 5, and the nut 6 is fixedly connected to the lifting mounting plate 3. A servo motor 7 is installed on the bracket 1. A driving gear 8 is sleeved on the output shaft of the servo motor 7. A driven gear 9 is sleeved on the bottom end of the self-locking screw 5. A transmission gear 10 is provided between the driving gear 8 and the driven gear 9. A lifting shaft 11 is installed between the lifting mounting plate 3 and the loading platform 2. The bottom of the lifting shaft 11 is fixed on the lifting mounting plate 3, and the top passes through the top surface of the bracket 1 and is fixedly connected to the bottom surface of the loading platform 2. A sealing bellows 12 is sleeved on the outer side of the lifting shaft 11.

[0037] In order to improve the stability of the platform during the lifting process, four linear guide rails 4 are provided inside the bracket 1. The slide rails in the linear guide rails 4 are fixed on the side walls of the bracket 1, and the sliders are fixedly connected to the jacking mounting plate 3.

[0038] The four linear guide rails 4 are opposite to each other and are located on opposite sides of the jacking mounting plate 3. Limit switches are respectively provided at both ends of the travel of the linear guide rails 4 to automatically shut down the servo motor at the maximum travel and the minimum travel to prevent derailment.

[0039] The linear guide provides high linear motion accuracy, high rigidity and anti-torsion ability, ensuring the motion accuracy and stability of the jacking mounting plate.

[0040] See also Figure 2 Two self-locking screws 5 are provided inside the bracket 1, and the two self-locking screws 5 are respectively located on opposite ends of the jacking mounting plate 3. The driven gear 9 connected to the two self-locking screws 5 is connected to the driving gear 8 through the same transmission gear 10. In this embodiment, the driving gear 8, the driven gear 9 and the transmission gear 10 are all helical gears. By precisely controlling the rotation angle of the servo motor, the transmission gear can drive the self-locking screws to rotate with a stable transmission ratio, thereby achieving precise control of the height of the loading platform. The use of gear transmission has high transmission efficiency and carrying capacity, which can widen the lifting and lowering rate of the lifting platform and meet the productivity requirements under rapid lifting conditions.

[0041] Example 3

[0042] An automatic lifting device suitable for use in vacuum-sealed environments, see Figure 3 , including a bracket 1 and a loading platform 2, a jacking mounting plate 3 and a self-locking screw 5 are provided inside the bracket 1, a nut 6 is sleeved on the outside of the self-locking screw 5, and the nut 6 is fixedly connected to the jacking mounting plate 3, a servo motor 7 is installed on the bracket 1, a driving gear 8 is sleeved on the output shaft of the servo motor 7, a driven gear 9 is sleeved on the bottom end of the self-locking screw 5, a transmission gear 10 is provided between the driving gear 8 and the driven gear 9, a jacking shaft 11 is installed between the jacking mounting plate 3 and the loading platform 2, the bottom of the jacking shaft 11 is fixed on the jacking mounting plate 3, the top passes through the top surface of the bracket 1, and is fixedly connected to the bottom surface of the loading platform 2, and a sealing bellows 12 is sleeved on the outside of the jacking shaft 11.

[0043] Three lifting shafts 11 are installed between the lifting mounting plate 3 and the loading platform 2. The midpoints of the three lifting shafts 11 are distributed in an equilateral triangle, have high strength and bending resistance, and ensure the straightness and flatness requirements of the loading platform during the lifting process.

[0044] Two sections of sealing bellows 12 are sleeved on the outside of each lifting shaft 11, one section is located inside the bracket 1, and the other section is located between the bracket 1 and the loading platform 2. One end of the sealing bellows 12 located inside the bracket 1 is sealed and fixedly connected to the inner top surface of the bracket 1, and the other end is sealed and fixedly connected to the top surface of the lifting mounting plate 3. One end of the sealing bellows 12 located between the bracket 1 and the loading platform 2 is sealed and fixedly connected to the bottom surface of the loading platform 2, and the other end is sealed and fixedly connected to the outer top surface of the bracket 1. Sealing gaskets are installed at the joints of the sealing bellows 12 to ensure the sealing performance of the sealing bellows. The telescopic length of the sealing bellows is greater than the maximum stroke of the lifting device.

[0045] Two self-locking screws 5 are installed within the bracket 1, located at opposite ends of the lifting mounting plate 3. A driven gear 9 connected to the two self-locking screws 5 is connected to the driving gear 8 via a common transmission gear 10. In this embodiment, the driving gear 8, the driven gear 9, and the transmission gear 10 are all double-helical gears. A self-locking screw prevents loosening or relative displacement when subjected to external forces. The self-locking screw 5 is a trapezoidal self-locking screw with good self-locking properties. The thread profile is an isosceles trapezoid with a 30° thread angle, enabling a large transmission ratio. Its self-locking property prevents the platform from sliding down when unpowered.

[0046] Four linear guides 4 are installed inside the bracket 1. The slide rails of the linear guides 4 are fixed to the side walls of the bracket 1, and the sliders are fixedly connected to the jacking mounting plate 3. The four linear guides 4 are located on opposite sides of the jacking mounting plate 3 in pairs, and limit switches are installed at both ends of the travel of the linear guides 4.

[0047] The top surface of the bracket 1 is provided with multiple threaded holes. When in use, the vacuum sealed container can be directly fixed to the top of the bracket 1 by bolts, and a sealing gasket is installed at the connection between the vacuum sealed container and the bracket 1, so that the loading platform is located in the vacuum sealed container, and the bracket and internal self-locking screw and other transmission devices are located in the atmospheric environment, which improves the overall sealing of the vacuum sealed container and makes the automatic lifting device of the utility model suitable for a vacuum-sealed working environment.

[0048] When applying the automatic lifting device of the utility model, a servo motor input signal is set to control the driving gear connected to the output shaft of the servo motor to rotate a specified angle. A pair of driven gears are driven to rotate by the transmission gear, thereby driving the self-locking screw to rotate, and the nut engaged with the self-locking screw moves up and down, driving the jacking mounting plate to move up and down, and then driving the loading platform to rise and fall.

[0049] When the utility model works in a vacuum-sealed environment, it can realize accurate, stable and efficient height adjustment through the automatic lifting platform without destroying the vacuum environment.

Claims

1. Applicable to automatic lifting device in vacuum sealed environment, characterized by: The invention comprises a bracket (1) and a loading platform (2), wherein a lifting mounting plate (3) and a self-locking screw (5) are provided inside the bracket (1), a nut (6) is provided on the outer side of the self-locking screw (5), and the nut (6) is fixedly connected to the lifting mounting plate (3), a servo motor (7) is installed on the bracket (1), a driving gear (8) is provided on the output shaft of the servo motor (7), a driven gear (9) is provided on the bottom end of the self-locking screw (5), a transmission gear (10) is provided between the driving gear (8) and the driven gear (9), a lifting shaft (11) is installed between the lifting mounting plate (3) and the loading platform (2), the bottom of the lifting shaft (11) is fixed on the lifting mounting plate (3), the top passes through the top surface of the bracket (1) and is fixedly connected to the bottom surface of the loading platform (2), and a sealing bellows (12) is provided on the outer side of the lifting shaft (11).

2. The automatic lifting device suitable for use in a vacuum-sealed environment according to claim 1, characterized in that: A linear guide rail (4) is provided inside the bracket (1), a slide rail in the linear guide rail (4) is fixed on the side wall of the bracket (1), and a slide block is fixedly connected to the jacking mounting plate (3).

3. The automatic lifting device suitable for use in a vacuum-sealed environment according to claim 2, characterized in that: Limit switches are respectively provided at both ends of the travel of the linear guide rail (4).

4. The automatic lifting device suitable for use in a vacuum-sealed environment according to claim 2, characterized in that: Four linear guide rails (4) are arranged inside the bracket (1).

5. The automatic lifting device suitable for use in a vacuum-sealed environment according to claim 4, characterized in that: The four linear guide rails (4) are opposed to each other in pairs and are respectively located on opposite sides of the jacking mounting plate (3).

6. The automatic lifting device suitable for use in a vacuum-sealed environment according to claim 1 or 5, characterized in that: Two self-locking screws (5) are provided inside the bracket (1), and the two self-locking screws (5) are respectively located at opposite ends of the jacking mounting plate (3).

7. The automatic lifting device suitable for use in a vacuum-sealed environment according to claim 6, characterized in that: The driven gear (9) connected to the two self-locking screws (5) is connected to the driving gear (8) through the same transmission gear (10).

8. The automatic lifting device suitable for use in a vacuum-sealed environment according to claim 1, characterized in that: Three lifting shafts (11) are installed between the lifting installation plate (3) and the loading platform (2), and the midpoints of the three lifting shafts (11) are distributed in the form of an equilateral triangle.

9. The automatic lifting device suitable for use in a vacuum-sealed environment according to claim 8, characterized in that: Two sections of sealing bellows (12) are sleeved on the outside of each lifting shaft (11), one section is located inside the bracket (1), and the other section is located between the bracket (1) and the loading platform (2). One end of the sealing bellows (12) located inside the bracket (1) is sealed and fixedly connected to the inner top surface of the bracket (1), and the other end is sealed and fixedly connected to the top surface of the lifting mounting plate (3). One end of the sealing bellows (12) located between the bracket (1) and the loading platform (2) is sealed and fixedly connected to the bottom surface of the loading platform (2), and the other end is sealed and fixedly connected to the outer top surface of the bracket (1). Sealing gaskets are installed at the connection points of the sealing bellows (12).

10. The automatic lifting device suitable for use in a vacuum-sealed environment according to claim 1, characterized in that: The self-locking screw (5) is a trapezoidal self-locking screw, the thread profile is an isosceles trapezoid, and the thread profile angle is 30°.

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