Dustproof device for target ball reflector of laser tracker

Abstract

The invention provides a dustproof device for a target ball reflector of a laser tracker. The dustproof device comprises a buffer gasket, a steering engine frame, a dustproof blocking piece and a front panel which are sequentially arranged from the end close to the target ball reflector to the end away from the target ball reflector. One end of the buffer gasket is fixedly connected with the target ball reflector, the other end of the buffer gasket is fixedly connected with the steering engine frame, the steering engine is fixedly connected to the upper portion of the steering engine frame, a rotating shaft on the front portion of the steering engine is rotationally connected with the steering engine swing arm, and the steering engine swing arm is fixedly connected with the dustproof blocking piece. A dustproof blocking piece light window is arranged on the dustproof blocking piece, and the front panel is fixedly connected with the steering engine frame. The dustproof blocking piece with the light window is adopted to cover the front portion of the light passing opening of the target ball, the dustproof effect is achieved, and meanwhile the normal use function of the target ball is not affected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of laser tracker equipment, in particular, especially relates to a laser tracker target ball reflector dustproof device. BACKGROUND

[0002] The laser tracker is a high-precision optical measurement device that tracks the target ball reflector in real time by emitting a laser beam, combines range finding and angle measurement technology, and obtains the three-dimensional coordinates of the target point. Its measurement radius can reach dozens of meters, the precision can reach microns, it supports static and dynamic measurement, and is widely used in large-size precision measurement and assembly positioning in the fields of aerospace and automobile manufacturing. The target ball reflector (hereinafter referred to as the target ball) is a key component of the laser tracker, and its surface is covered with high-reflectivity material, which can reflect the incident laser back to the tracker to realize accurate distance measurement. As a spatial positioning reference, the center coordinates of the target ball are used to determine the target position, and the spherical design allows laser to be incident from any direction, ensuring measurement flexibility and stability, and directly affecting the overall measurement accuracy and reliability of the system.

[0003] Dust adhesion can significantly reduce the performance of the target ball reflector: the decrease in reflectivity leads to attenuation of the laser signal, increasing the range finding error; uneven dust distribution can cause spot distortion, interfering with angle measurement; severe dust accumulation may cause tracking loss, affecting the stability of dynamic measurement; long-term dust accumulation can also change the surface characteristics of the target ball, causing ball center calibration deviation. Studies have shown that when the dust coverage rate of the target ball surface reaches 5%, the measurement error may exceed 10 microns. Therefore, in industrial applications, dust prevention measures need to be taken and regular cleaning is required to maintain the accuracy and reliability of the measurement system. However, regular cleaning of the reflective target ball not only requires recalibration of the measurement system, reducing measurement efficiency, but also damages the target ball, making the target ball scrap. Especially in harsh environments such as shipbuilding, high-precision target balls will be quickly scrapped under the influence of pollutants such as metal and oil stains. The high price of high-precision target balls, which can reach tens of thousands of yuan, greatly increases the measurement cost. SUMMARY

[0004] According to the technical problem that the existing target ball reflector is affected by dust during use, a laser tracker target ball reflector dustproof device is provided. The dustproof device covers the light window of the target ball reflector with a dustproof baffle, which has the effect of preventing dust while not affecting the normal use of the target ball.

[0005] The technical means adopted by the present application are as follows: A laser tracker target ball reflector dustproof device, comprising a buffer washer, a rudder frame, a dustproof baffle and a front panel arranged in sequence from the end close to the target ball reflector to the end away from the target ball reflector. One end of the buffer washer is fixedly connected with the target ball reflector, the other end of the buffer washer is fixedly connected with the rudder frame, the upper part of the rudder frame is fixedly connected with the rudder, the rotating shaft of the front part of the rudder is rotatably connected with the rudder swing arm, the rudder swing arm is fixedly connected with the dustproof baffle, the dustproof baffle is provided with a dustproof baffle light window, and the front panel is fixedly connected with the rudder frame.

[0006] Further, the buffer washer is a circular ring, the rudder frame comprises a circular ring-shaped first light-transmitting part and a rudder connecting part above the first light-transmitting part, the rudder connecting part is connected with the rudder, the dustproof baffle comprises a circular ring-shaped second light-transmitting part and a rudder frame connecting part above the second light-transmitting part, the rudder frame connecting part is connected with the rudder frame, and the second light-transmitting part is provided with a dustproof baffle light window; and the front panel is a circular ring.

[0007] Further, the circular ring centers of the buffer washer, the rudder frame, the dustproof baffle and the front panel are on the optical axis of the target ball reflector.

[0008] Further, the buffer washer is adhesively connected with the rudder frame, the dustproof baffle light window is adhesively connected with the dustproof baffle frame, and the buffer washer is adhesively connected with the target ball reflector.

[0009] Further, the rudder is electrically connected with a rudder control panel, the rudder control panel comprises a microcontroller, an opening position variable resistor, a closing position variable resistor and an interface. The microcontroller reads the voltage division values of the opening position variable resistor and the closing position variable resistor to set the running position of the rudder swing arm; the closing position variable resistor is adjusted to set the light hole closing position of the rudder swing arm when the light hole is closed, and the light hole closing position makes the center of the light window coincide with the light hole optical axis; and the opening position variable resistor is adjusted to set the light hole opening position of the rudder swing arm when the light hole is opened, and the light hole opening position makes the dustproof baffle frame not shield the light hole at all.

[0010] Further, the control method of the rudder swing arm by the rudder control panel is as follows: The microcontroller pulls down the level of the control panel interface state line to inform the upper computer that the dustproof device is online. The positions of the light hole opening and closing, i.e. the voltage division values of the opening position variable resistor and the closing position variable resistor, are read in sequence. The control line signal of the control panel interface is read, if the control signal is a low level, the light hole is closed, and if the control signal is a high level, the light hole is opened. The light hole opening position is read, and the next cycle process is started.

[0011] Compared with the prior art, the present application has the following advantages: The actual measuring time of the target ball is much less than the placing time, so the light window of the target ball can be closed to prevent dust when the measuring is not needed, so the manual work of removing the dustproof bag is not needed, and the measuring efficiency is improved; The dustproof baffle of the application is provided with optical glass, which retains the measuring function of the target ball while preventing dust, so the dustproof baffle can be closed during the function debugging stage of the measuring system, and then opened when the formal measuring is performed to ensure the accuracy, which greatly reduces the duration of opening of the dustproof baffle and further reduces the amount of dust invasion; The steering engine control board of the application adopts a microcontroller as the core, accurately controls the opening and closing positions of the dustproof baffle through an adjustable resistor, simplifies the steering engine controlled by PWM to 2-level control, improves the control accuracy and flexibility, and simplifies the control method; The online monitoring signal of the steering engine control board of the application provides the possibility for the cooperative control of multiple dustproof devices in actual use, and the method can be applied to the application of multiple target ball dustproof; The steering engine, the dustproof baffle and the steering engine frame of the dustproof device are connected to each other through screws, which facilitates disassembly and cleaning and reduces the complexity of maintenance; The application has small volume and light weight, has little influence on the stability of the target ball, and has little influence on the relative movement of the target ball and the base. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor under the premise of the drawings.

[0013] Figure 1 It is a schematic diagram of the device of the application.

[0014] Figure 2 It is a light hole state diagram of the target ball dustproof device of the application, Figure 2 (a) is a schematic diagram when the light hole is closed, Figure 2 (b) is a schematic diagram when the light hole is opened.

[0015] Figure 3 It is a schematic diagram of the composition of the steering engine control board of the application.

[0016] Figure 4 It is a program flow chart of the microcontroller on the steering engine control board of the application.

[0017] In the figure: 1, target ball reflector; 2, buffer washer; 3, rudder frame; 4, rudder; 5, rudder swing arm; 6, dustproof baffle; 7, dustproof baffle light window; 8, rudder control panel; 9, front panel; 10, light hole closing position; 11, light hole opening position; 12, interface; 13, microcontroller; 14, opening position rheostat; 15, closing position rheostat. DETAILED DESCRIPTION

[0018] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The technical solutions in the embodiments of the present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0019] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0020] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a presence of a feature, step, operation, device, component and / or combination thereof.

[0021] Unless specifically stated otherwise, the relative arrangement of components and steps, numerical expressions, and numerical values set forth in the various examples herein are not limiting of the scope of the application. Also, it is to be understood that the various embodiments can be utilized in different specific combinations, and that the various embodiments can be combined with each other in different ways, and that the examples are not limited to the specific combinations described herein. Furthermore, it should be noted that the dimensions of the various parts shown in the drawings are not necessarily to scale, and that the dimensions of the parts can be exaggerated relative to each other for clarity. The technology, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as if the discussion were in place. In all examples shown and discussed herein, any specific values are to be interpreted as merely illustrative, and not as a limitation on the scope of the exemplary embodiments. Thus, other examples of the exemplary embodiments can have different values. It is noted that like numbers and letters refer to like elements throughout the several views of the drawings and that one or more specific embodiments can be substantially similar to the examples described herein. Thus, for instance, a feature, structure, component, or aspect described in one embodiment can be included in a description of one or more other embodiments.

[0022] In the description of the present application, it needs to be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship is generally based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the scope of protection of the present application: the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component itself.

[0023] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0024] In addition, it needs to be pointed out that the use of "first", "second" and the like to define parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, therefore cannot be understood as a limitation on the scope of protection of the present application.

[0025] As Figures 1-4 shown, the present application provides a dustproof device for laser tracker target ball reflector, which is composed of buffer gasket 2, rudder frame 3, rudder 4, rudder swing arm 5, dustproof baffle 6, dustproof baffle light window 7, rudder control panel 8 and front panel 9. The buffer gasket 2 is fixedly connected with the rudder frame 3 by bonding. The rudder swing arm 5 is installed on the rotating shaft of the rudder 4 by screw and rotates with the rudder 4. The dustproof baffle frame 6 is fixedly connected with the rudder swing arm 5 by screw, and the dustproof baffle light window 7 is fixedly connected with the dustproof baffle frame 6 by bonding. When the rudder 4 rotates, the dustproof baffle frame 6 and the light window 5 rotate together. The front panel 9 is fixedly connected with the rudder frame 3 by screw, provides downward pressure to the dustproof baffle frame 6, ensures the fit of the dustproof baffle frame 6 and the flange plane of the rudder frame 3, and guarantees the dustproof effect. The whole dustproof device is fixedly connected with the target ball reflector 1 by the interface of the buffer gasket 2.

[0026] The opening of the front panel 9, the rudder arm 5 and the buffer washer 2 is located on the optical axis of the target ball 1, and together constitutes a light transmission hole. When the rudder arm is located at the light transmission hole closing position 10, the light transmission hole is closed, at this time the laser emitted by the laser tracker enters the target ball 1 through the dustproof baffle light window 7, and then returns to the laser tracker after reflection. When the rudder arm is located at the light transmission hole opening position 11, the light transmission hole is opened, at this time the laser emitted by the laser tracker directly enters the target ball 1, and returns to the laser tracker after reflection.

[0027] The opening and closing of the light transmission hole are controlled by the rudder control panel 8, and the control core is a microcontroller 13. The running position of the rudder arm 5 is set by reading the voltage division value of the opening position variable resistor 14 and the closing position variable resistor 15. The user sets the position 10 of the rudder arm when the light transmission hole is closed by adjusting the closing position variable resistor 15, which should make the center of the light window 7 coincide with the optical axis of the light transmission hole. The user sets the position 11 of the rudder arm when the light transmission hole is opened by adjusting the opening position variable resistor 14, which should make the dustproof baffle frame 6 not block the light transmission hole at all, so as to ensure the measurement accuracy. The interface 12 of the rudder control panel 8 includes 4 lines, which are power line, ground line, state line and control line, respectively responsible for power supply and communication.

[0028] The microcontroller 13 is usually a single-chip microcomputer, which runs a program stored in its internal memory. The program flow chart is shown in Figure 4 After the dustproof device is powered on, the microcontroller 13 first pulls the level of the control panel interface 12 state line low to inform the upper computer that the dustproof device is online, then reads the voltage division value of the opening position variable resistor 14 and the closing position variable resistor 15, and then reads the control signal of the control panel interface 12 control line. If the control signal is low, the light transmission hole is closed, and if the control signal is high, the light transmission hole is opened. Then the program returns to read the opening position of the light transmission hole, and starts the next cycle.

[0029] The dustproof baffle 6 with a light window is used to cover the front of the light transmission hole of the target ball, which has the effect of preventing dust while not affecting the normal use function of the target ball. When high-precision measurement is required, the light window of the dustproof baffle 6 will affect the measurement accuracy, so the dustproof baffle 6 is connected to the rudder 4 through the rudder arm 5, and the rudder control panel 8 controls the rotation of the rudder to realize the function of sliding opening and closing the dustproof baffle 6. After high-precision measurement is completed, the rudder 4 will re-slide the dustproof baffle 6 to cover the front end of the target ball to prevent dust from entering.

[0030] The device of the application takes the rigid steering engine frame 3 as the core, is connected with the target ball through the buffer washer 2, the buffer washer 2 is made of rubber or silica gel material, ensures that it is closely attached to the optical interface of the target ball, so as to realize the dustproof function. The buffer washer 2 is connected with the target ball and the steering engine frame 3 by bonding. The steering engine 4 is installed on the steering engine frame 3, is connected with the dustproof baffle 6 frame through the steering engine swing arm 5, the steering engine swing arm 5 is made of plastic material, can be slightly moved along the optical axis direction of the target ball while meeting the lateral rigidity, so as to realize the sealing effect. The dustproof baffle light window 7 is made of optical glass, is bonded with the dustproof baffle 6 frame through glue, on the one hand, the effect of dustproof is achieved, on the other hand, the laser emitted by the laser tracker can be normally transmitted. The outermost side of the dustproof device is the front panel 9, which is rigidly connected with the steering engine frame 3 through screws. The front panel 9 exerts force on the steering engine frame 3 along the optical axis of the target ball through the elastic sheet, so that the dustproof baffle 6 is closely attached to the flange interface of the steering engine frame 3, and the dustproof effect is realized. The steering engine control board 8 is bonded with the steering engine 4, and is electronically connected with the steering engine 4 through wires. The steering engine control board 8 takes the microcontroller 13 as the control core, generates the PWM signal for controlling the steering engine, and controls the position of the dustproof baffle 6. The dustproof baffle 6 has only two positions of opening and closing, and the two positions are set through the adjustable resistor on the steering engine control board. The steering engine control board 8 has a four-wire control interface 12 for power supply and control, can control the opening and closing of the dustproof baffle 6 under the action of external signals, and can send the online information of the control board to the upper computer.

[0031] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, and not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application.

Claims

1. A dustproof device for a laser tracker target ball reflector, characterized in that: It includes a buffer gasket (2), a servo frame (3), a dustproof baffle (6) and a front panel (9) arranged sequentially from the end closest to the target ball reflector to the end furthest from the target ball reflector (1); One end of the buffer washer (2) is fixedly connected to the target ball reflector (1), and the other end of the buffer washer (2) is fixedly connected to the servo frame (3). A servo (4) is fixedly connected to the upper part of the servo frame (3). The rotating shaft at the front of the servo (4) is rotatably connected to the servo swing arm (5). The servo swing arm (5) is fixedly connected to the dustproof baffle (6). A dustproof baffle window (7) is provided on the dustproof baffle (6). The front panel (9) is fixedly connected to the servo frame (3).

2. The dustproof device for the target ball reflector of the laser tracker according to claim 1, characterized in that: The buffer gasket (2) is annular; the servo frame (3) includes an annular first light-transmitting part and a servo connecting part above the first light-transmitting part, the servo connecting part being connected to the servo (4); the dustproof baffle (6) includes an annular second light-transmitting part and a servo frame (3) connecting part above the second light-transmitting part, the servo frame (3) connecting part being connected to the servo frame (3), and a dustproof baffle light window (7) is provided on the second light-transmitting part; the front panel (9) is annular.

3. The dustproof device for the target ball reflector of the laser tracker according to claim 2, characterized in that: The center of the annulus of the buffer gasket (2), servo frame (3), dustproof baffle (6) and front panel (9) is located on the optical axis of the target ball reflector (1).

4. The dustproof device for the target ball reflector of the laser tracker according to claim 1, characterized in that: The buffer gasket (2) is bonded to the servo frame (3); the dustproof baffle window (7) is bonded to the frame of the dustproof baffle (6); the buffer gasket (2) is bonded to the target ball reflector (1).

5. The dustproof device for the target ball reflector of the laser tracker according to claim 1, characterized in that: The servo motor (4) is electrically connected to the servo motor control board (8), which includes a microcontroller (13), an open position rheostat (14), a closed position rheostat (15), and an interface (12). The microcontroller (13) reads the voltage division values ​​of the open position rheostat (14) and the closed position rheostat (15) to set the operating position of the servo arm (5); by adjusting the closed position rheostat (15), the light hole closing position (10) of the servo arm (5) when the light hole is closed is set, and the light hole closing position (10) makes the center of the light window (7) coincide with the light axis of the light hole; The opening position (11) of the servo arm (5) when the light hole is opened is set by adjusting the opening position rheostat (14). The opening position (11) of the light hole ensures that the frame of the dustproof baffle (6) does not block the light hole at all.

6. The dustproof device for the target ball reflector of the laser tracker according to claim 1, characterized in that: The control method of the servo control board (8) for the servo arm (5) is as follows: The microcontroller (13) pulls down the level of the status line of the interface (12) of the control board (8) to notify the host computer that the dustproof device is online; Read the open and closed positions of the light-transmitting hole in sequence, that is, the voltage division values ​​of the open position rheostat (14) and the closed position rheostat (15); Read the control line signal of the interface (12) of the control board (8). If the control signal is low, close the light hole; if the control signal is high, open the light hole. Return to the position where the light aperture is open (11) and start the next loop process.

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