Vacuum laser zone plate lifting device

Abstract

This utility model relates to the field of dam displacement deformation monitoring technology, and in particular to a vacuum laser zone plate lifting and lowering device, comprising: a measuring point box, and a zone plate, a driving mechanism, a rotating mechanism, and a resetting mechanism disposed within the measuring point box; the zone plate and the resetting mechanism are both connected to the rotating mechanism, and the resetting mechanism is used to reset the zone plate to its initial position; the driving mechanism is connected to the rotating mechanism through an elastic element and drives the rotating mechanism to rotate at a preset frequency to realize the lifting and lowering of the zone plate; when the driving mechanism is started, the driving mechanism drives the rotating mechanism to rotate, causing the zone plate to rotate from its initial position to its working position; when the driving mechanism is de-energized, the resetting mechanism drives the rotating mechanism to rotate back, causing the zone plate to reset to its initial position. The advantage of this utility model is that the elastic element can suppress the micro-vibration of the driving rod in a vacuum environment during energy storage, and the step angle error of the motor is filtered out by the elastic element, thereby improving the positional accuracy of the zone plate.

Description

Technical Field

[0001] This utility model relates to the field of dam displacement deformation monitoring technology, and in particular to a vacuum laser waveband plate lifting and lowering device. Background Technology

[0002] The safety of hydropower engineering structures is directly related to the safety of people's lives and property. To ensure the normal operation of water conservancy projects and to detect problems in a timely manner, it is necessary to add monitoring items to the projects, among which deformation monitoring is the core link of safety monitoring. At present, deformation monitoring methods mainly include leveling, line-of-sight method, plumb line device method, bimetallic marker method, and vacuum laser collimation method. Vacuum laser collimation device is widely used in dam monitoring due to its high precision. Its principle is to calculate displacement through zone plate imaging, and the positioning accuracy of the zone plate plays a decisive role in the measurement results.

[0003] Currently, there are two main types of waveguide plate lifting devices: the falling type and the rising type. In the falling type, the waveguide plate is driven by a stepper motor and works vertically to the ground; after power failure, the counterweight automatically resets it. In actual engineering renovation projects, when it is necessary to retain the original measuring point box, the falling type device often faces the problem of insufficient internal space in the measuring point box because it requires reserving space for the counterweight to fall and for vertical movement.

[0004] The upward-lifting type is suitable for retrofit projects where the internal space of the measuring point box is limited, but it has the problem that the zone plate cannot be completely vertical after being lifted, resulting in abnormal light spots at the vacuum laser receiver and thus affecting the accuracy of displacement calculation. In addition, if the zone plate flipping mechanism malfunctions, the zone plate may not be able to exit the working position normally, which will block the entire laser path and affect the measurement of the entire laser. Utility Model Content

[0005] In view of this, the present invention aims to provide a vacuum laser zone plate lifting and lowering device, which, by setting a reset mechanism, resets the zone plate to its initial position by means of a rotation mechanism when the drive mechanism is de-energized.

[0006] To achieve the above objectives, the technical solution created by this utility model is as follows: A vacuum laser zone plate lifting and lowering device includes: a measuring point box, and a zone plate, a driving mechanism, a rotating mechanism, and a resetting mechanism disposed within the measuring point box; the zone plate and the resetting mechanism are both connected to the rotating mechanism, and the resetting mechanism is used to reset the zone plate to its initial position; the driving mechanism is connected to the rotating mechanism through an elastic element and drives the rotating mechanism to rotate at a preset frequency to realize the lifting and lowering of the zone plate; when the driving mechanism is started, the driving mechanism drives the rotating mechanism to rotate, causing the zone plate to rotate from its initial position to its working position; when the driving mechanism is de-energized, the resetting mechanism drives the rotating mechanism to rotate back, causing the zone plate to reset to its initial position.

[0007] Furthermore, the drive mechanism includes a motor base, a motor, and a drive rod. The motor base is installed at the bottom of the measuring point box, the fixed end of the motor is connected to the motor base, the output end of the motor is connected to one end of the drive rod, and the other end of the drive rod is connected to the rotating mechanism through an elastic element.

[0008] Furthermore, the rotating mechanism includes a shaft frame, a rotating shaft, and a waveguide plate frame; the shaft frame is mounted on a motor base, the rotating shaft is rotatably connected to the shaft frame, and the waveguide plate frame is detachably connected to the rotating shaft; the waveguide plate is mounted on the waveguide plate frame; and the drive rod is connected to the waveguide plate frame via an elastic element.

[0009] Furthermore, the waveband plate frame includes an annular portion and a connecting portion. The annular portion is provided with a positioning groove that matches the waveband plate, and the waveband plate is embedded in the positioning groove. The connecting portion is provided with an elongated hole.

[0010] Furthermore, the rotating shaft is provided with a mounting groove and a threaded hole. The connecting part is embedded in the mounting groove, and the bolt passes through the elongated hole and is screwed into the threaded hole to connect the wave plate frame to the rotating shaft.

[0011] Furthermore, the reset mechanism includes a connecting plate, a compression spring, and a ejector pin. The connecting plate is provided with a mounting hole, the compression spring is disposed in the mounting hole, one end of the ejector pin extends into the mounting hole and abuts against the compression spring, and the other end of the ejector pin is located outside the mounting hole.

[0012] Furthermore, the shaft frame includes a first sidewall and a second sidewall disposed opposite to each other, and the two ends of the rotating shaft are rotatably connected to the first sidewall and the second sidewall, respectively.

[0013] Furthermore, connection interfaces are provided on opposite sides of the measuring point box. These interfaces are connected to the vacuum pipeline via corrugated pipes, thereby creating and maintaining a vacuum working environment inside the measuring point box.

[0014] Furthermore, the elastic element is a spring.

[0015] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0016] 1) The connection interface on the measuring point box, which is connected to the vacuum pipeline, can form and maintain a vacuum working environment inside the measuring point box, making it easy to quickly replace the measuring point box during maintenance.

[0017] 2) By using intermittent jog pulses of the motor, energy savings of more than 50% can be achieved compared to continuous rotation mode, and the thermal deformation caused by motor heating is reduced in a vacuum environment.

[0018] 3) During energy storage, the elastic element can suppress the micro-vibration of the drive rod in a vacuum environment and filter the step angle error of the motor, thereby improving the positional accuracy of the waveguide plate. At the same time, the elastic element effectively overcomes the self-weight rotation tendency of the rotating mechanism, ensuring the positional stability of the waveguide plate during the jogging cycle.

[0019] 4) When the motor fails and loses power, the reset mechanism ensures that the zone plate quickly exits the measurement optical path, thereby avoiding interference with the laser paths of adjacent measurement points. In addition, when the zone plate is in the vertical turntable position, the reset mechanism also serves as a mechanical limit. Attached Figure Description

[0020] The accompanying drawings, which form part of this invention, are used to provide a further understanding of this invention. The illustrative embodiments and descriptions of this invention are used to explain this invention and do not constitute an undue limitation of this invention. In the drawings:

[0021] Figure 1 This is a schematic diagram of the vacuum laser zone plate lifting device provided according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the vacuum laser zone plate lifting device provided according to an embodiment of the present invention from another perspective;

[0023] Figure 3 This is a structural schematic diagram of the measuring point box provided according to an embodiment of the present utility model;

[0024] Figure 4 This is a schematic diagram of the drive mechanism provided according to an embodiment of the present utility model;

[0025] Figure 5 This is a schematic diagram of the rotating mechanism provided according to an embodiment of the present utility model;

[0026] Figure 6 This is a schematic diagram of the structure of the rotating shaft provided according to an embodiment of the present utility model;

[0027] Figure 7 This is a structural schematic diagram of the waveband plate frame provided according to an embodiment of the present utility model;

[0028] Figure 8 This is a schematic diagram of the reset mechanism provided according to an embodiment of the present utility model.

[0029] The reference numerals in the attached drawings include: 1. Measuring point box; 11. Box body; 12. Cover plate; 13. Connection interface; 14. Connecting seat; 2. Waveband plate; 3. Drive mechanism; 31. Motor base; 32. Motor; 33. Drive rod; 4. Rotation mechanism; 41. Shaft bracket; 42. Rotating shaft; 421. Mounting groove; 43. Waveband plate bracket; 431. Circular part; 432. Connecting part; 5. Reset mechanism; 51. Connecting plate; 52. Compression spring; 53. Ejector pin; 6. Elastic element. Detailed Implementation

[0030] To make the purpose, technical solution, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and do not constitute a limitation thereof.

[0031] It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0032] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] like Figures 1 to 8 As shown in the figure, a vacuum laser zone plate raising and lowering device provided by this utility model includes: a measuring point box 1, and a zone plate 2, a driving mechanism 3, a rotating mechanism 4, and a resetting mechanism 5 disposed within the measuring point box 1. The zone plate 2 and the resetting mechanism 5 are connected to the rotating mechanism 4, and the resetting mechanism 5 is used to reset the zone plate 2 to its initial position. The driving mechanism 3 is connected to the rotating mechanism 4 through an elastic element 6, and drives the rotating mechanism 4 to rotate at a preset frequency to realize the raising and lowering of the zone plate 2. When the driving mechanism 3 is activated, the driving mechanism 3 drives the rotating mechanism 4 to rotate, causing the zone plate 2 to rotate from its initial position to its working position; when the driving mechanism 3 is de-energized, the resetting mechanism 5 drives the rotating mechanism 4 to rotate back, causing the zone plate 2 to reset to its initial position.

[0036] The initial position is defined as the position when the zone plate 2 is in a horizontal state. The working position is defined as the position when the zone plate 2 is rotated 90° clockwise from the initial position and is in a vertical state.

[0037] The measuring point box 1 has connection interfaces on opposite sides, which are connected to a vacuum pipeline via corrugated pipes, creating and maintaining a vacuum working environment inside the measuring point box 1. Specifically, the measuring point box 1 includes a box body 11, a cover plate 12, and two connection interfaces 13. The box body 11 is a rectangular box, and a connecting seat 14 is provided at the bottom of the box body 11 for connecting the drive mechanism 3. Connection ports are provided on opposite sides of the box body 11, and an opening is provided at the top of the box body 11. The two connection interfaces 13 are connected to the two connection ports respectively, and the cover plate 12 is connected to the opening. The connection interface 13 includes a connecting pipe and a connecting flange. The connecting pipe is connected to the connection port, and the connecting flange is connected to the vacuum pipeline via a corrugated pipe.

[0038] The drive mechanism 3 includes a motor base 31, a motor 32, and a drive rod 33. The motor base 31 is mounted on the connecting seat 14 of the measuring point box 1. The fixed end of the motor 32 is connected to the motor base 31, and the output end of the motor 32 is connected to one end of the drive rod 33. The other end of the drive rod 33 is connected to the rotating mechanism 4 via an elastic element 6. One end of the drive rod 33 is connected to the output shaft of the motor 32 via a shaft clamp, and the other end of the drive rod 33 is provided with a threaded section. Two locking nuts are screwed onto the threaded section in sequence. One end of the elastic element 6 is hooked onto the threaded section and located between the two locking nuts. By adjusting the axial position of the two locking nuts, the axial limit of the elastic element 6 is achieved. The motor 32 outputs intermittent jogging pulses at a preset frequency, which drive the elastic element 6 through the drive rod 33 to rotate the rotating mechanism 4, thereby realizing the raising and lowering of the waveband plate 2.

[0039] In this embodiment, the elastic element 6 is a spring, and the motor 32 is a stepper motor.

[0040] Stepper motors achieve an accuracy of less than 5% per step and do not accumulate errors from one step to the next, thus exhibiting good positional accuracy and motion repeatability. They also possess excellent start-stop and reverse response capabilities. Because stepper motors do not have brushes, they offer high reliability. The response of a stepper motor is determined solely by digital input pulses, allowing for open-loop control, which simplifies the stepper motor's structure and reduces control costs.

[0041] Motor 32 outputs intermittent jogging pulses at a preset frequency, which, through drive rod 33, keep elastic element 6 in an energy storage state. During the pulse interval, elastic element 6 releases elastic potential energy, keeping the rotating mechanism 4 in a predetermined position. During the energy storage period, elastic element 6 can suppress the micro-vibration of drive rod 33 in a vacuum environment and filter the step angle error of motor 32, thereby improving the positional accuracy of waveplate 2. At the same time, elastic element 6 effectively overcomes the tendency of rotation due to its own weight of the rotating mechanism 4, ensuring the positional stability of waveplate 2 within the jogging cycle. In addition, the intermittent jogging pulses of motor 32 can save more than 50% energy compared to continuous rotation mode (as determined by experiments), and reduce the thermal deformation caused by the heating of motor 32 in a vacuum environment.

[0042] It should be noted that the preset frequency is an inherent adjustable parameter of motor 32, which can be set according to actual working conditions. This utility model does not impose specific limitations on the preset frequency.

[0043] The rotating mechanism 4 includes a shaft frame 41, a rotating shaft 42, and a waveguide plate frame 43. The shaft frame 41 is mounted on the motor base 31, the rotating shaft 42 is rotatably connected to the shaft frame 41, and the waveguide plate frame 43 is detachably connected to the rotating shaft 42. The waveguide plate 2 is mounted on the waveguide plate frame 43. The drive rod 33 is connected to the waveguide plate frame 43 via an elastic element 6.

[0044] There are two ways to connect the elastic element 6 to the waveband plate frame 43:

[0045] Example 1:

[0046] A column is provided on the waveband plate frame 43, and a through hole is provided on the column. The end of the elastic element 6 away from the drive rod 33 is hooked in the through hole.

[0047] Example 2:

[0048] A stud is provided on the wave plate frame 43, a locking nut is sleeved on the stud, and the end of the elastic element 6 away from the drive rod 33 is hooked on the stud, and the axial limit of the elastic element 6 is achieved by the locking nut.

[0049] The shaft bracket 41 adopts a U-shaped structure, including a first sidewall and a second sidewall arranged opposite to each other, with coaxial through connecting holes at corresponding positions on the first sidewall and the second sidewall. The two ends of the rotating shaft 42 are located in the connecting holes respectively, and are rotatably connected to the first sidewall and the second sidewall by bearings.

[0050] The zone plate holder 43 includes an annular portion 431 and a connecting portion 432. The annular portion 431 is provided with a positioning groove adapted to the zone plate 2, and the zone plate 2 is embedded in the positioning groove. The connecting portion 432 is provided with an elongated hole for adjusting the position of the zone plate 2.

[0051] The rotating shaft 42 is provided with a mounting groove 421 and a threaded hole. The connecting part 432 is embedded in the mounting groove 421. The bolt passes through the elongated hole and is screwed into the threaded hole to connect the wave plate frame 43 to the rotating shaft 42.

[0052] The reset mechanism 5 includes a connecting plate 51, a compression spring 52, and a ejector pin 53. The connecting plate 51 is mounted on the top of the shaft bracket 41. The connecting plate 51 is provided with a mounting hole. The compression spring 52 is disposed in the mounting hole. One end of the ejector pin 53 extends into the mounting hole and abuts against the compression spring 52. The other end of the ejector pin 53 is located outside the mounting hole.

[0053] The working process of the vacuum laser zone plate lifting device is described below with reference to the accompanying drawings:

[0054] When motor 32 is started, it drives elastic element 6 via drive rod 33, which in turn drives rotating mechanism 4 to rotate. This rotates waveplate 2 90° clockwise from its initial position, bringing waveplate 2 into a vertical position (working position). At this time, ejector pin 53 abuts against waveplate frame 43, and compression spring 52 is compressed. When motor 32 malfunctions and loses power, compression spring 52 releases its elastic potential energy, driving waveplate frame 43 via ejector pin 53 to rotate waveplate 2 from a vertical position to a horizontal position.

[0055] When the motor 32 fails and loses power, the reset mechanism 5 ensures that the zone plate 2 quickly exits the measurement optical path, thereby avoiding interference with the laser path of adjacent measuring points. In addition, when the zone plate 2 is in the vertical turntable position, the reset mechanism 5 also serves as a mechanical limit.

[0056] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A vacuum laser zone plate lifting and lowering device, characterized in that, include: The measuring point box, and the waveband plate, driving mechanism, rotating mechanism and reset mechanism disposed in the measuring point box; The zone plate and the reset mechanism are both connected to the rotation mechanism. The reset mechanism is used to reset the zone plate to its initial position. The driving mechanism is connected to the rotating mechanism through an elastic element, and drives the rotating mechanism to rotate at a preset frequency to realize the raising and lowering of the waveband plate; When the drive mechanism is activated, it drives the rotating mechanism to rotate, causing the zone plate to rotate from its initial position to its working position. When the drive mechanism is de-energized, the reset mechanism drives the rotating mechanism to rotate back, causing the zone plate to reset to its initial position.

2. The vacuum laser zone plate lifting and lowering device according to claim 1, characterized in that, The driving mechanism includes a motor base, a motor, and a drive rod. The motor base is installed at the bottom of the measuring point box. The fixed end of the motor is connected to the motor base. The output end of the motor is connected to one end of the drive rod. The other end of the drive rod is connected to the rotating mechanism through an elastic element.

3. The vacuum laser zone plate lifting and lowering device according to claim 2, characterized in that, The rotating mechanism includes a shaft frame, a rotating shaft, and a waveguide plate frame; the shaft frame is mounted on the motor base, the rotating shaft is rotatably connected to the shaft frame, and the waveguide plate frame is detachably connected to the rotating shaft; the waveguide plate is mounted on the waveguide plate frame; and the drive rod is connected to the waveguide plate frame through the elastic element.

4. The vacuum laser zone plate lifting and lowering device according to claim 3, characterized in that, The waveband plate frame includes an annular portion and a connecting portion. The annular portion is provided with a positioning groove adapted to the waveband plate, and the waveband plate is embedded in the positioning groove. The connecting portion is provided with an elongated hole.

5. The vacuum laser zone plate lifting and lowering device according to claim 4, characterized in that, The rotating shaft is provided with a mounting groove and a threaded hole. The connecting part is embedded in the mounting groove, and the bolt passes through the elongated hole and is screwed into the threaded hole to connect the waveband plate frame to the rotating shaft.

6. The vacuum laser zone plate lifting and lowering device according to claim 3, characterized in that, The reset mechanism includes a connecting plate, a compression spring, and a push pin. The connecting plate has a mounting hole, the compression spring is disposed in the mounting hole, one end of the push pin extends into the mounting hole and abuts against the compression spring, and the other end of the push pin is located outside the mounting hole.

7. The vacuum laser zone plate lifting device according to claim 3, characterized in that, The shaft frame includes a first sidewall and a second sidewall arranged opposite to each other, and the two ends of the rotating shaft are rotatably connected to the first sidewall and the second sidewall, respectively.

8. The vacuum laser zone plate lifting and lowering device according to claim 1, characterized in that, The measuring point box is provided with connection interfaces on opposite sides. The connection interfaces are connected to the vacuum pipeline through corrugated pipes, so that a vacuum working environment is formed and maintained inside the measuring point box.

9. The vacuum laser zone plate lifting and lowering device according to claim 1, characterized in that, The elastic element is a spring.

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