Connection structure of scanning head mechanism and laser positioning lamp and corresponding scanning device

Abstract

The application provides a scanning head mechanism and a connecting structure of a laser positioning lamp and a corresponding scanning device, the scanning device comprising a scanning mechanism, a laser positioning lamp and a rotating device, the scanning mechanism comprising an electric control box, a scanning head main body and a sliding plate, one or two scanning head main bodies being connected to the bottom of the electric control box, and the sliding plate being slidingly connected to the two sides of the electric control box. Two laser positioning lamps are connected to the sliding plate. Two rotating devices are arranged on the two sides of the scanning mechanism, each rotating device surrounding an outer part of a laser positioning lamp, and the light shielding plate of the rotating device shielding or avoiding the laser positioning lamp, so as to realize the bright and dark effect of the light projection of the laser positioning lamp. The scanning device of the application is connected to the laser positioning lamp and the rotating device by using the sliding plate, and the bottom of the electric control box can be connected to one or two scanning head main bodies, so that different numbers of scanning head main bodies and different numbers of laser positioning lamps can be used in combination, the mode is various, and the function is strong.

Description

[0001] This application is a divisional application. The original application has the application number "202310165360.6" and the application date "February 24, 2023". The invention title is "A scanning device with an active laser positioning light". Technical Field

[0002] This invention relates to the field of scanning equipment, and more particularly to a connection structure between a scanning head mechanism and a laser positioning lamp, and a corresponding scanning device. Background Technology

[0003] Scanning equipment is a high-precision optoelectronic integrated high-tech product. It is a device that uses optoelectronic technology and digital processing technology to convert graphic or image information into digital signals through scanning. In existing technology, a single scanning head is generally used with a laser positioning lamp. However, in some cases, to improve positioning accuracy, two laser positioning lamps are used with a single scanning head, or two scanning heads are used with two laser positioning lamps to form two sets of scanning modules. Existing equipment cannot be adapted to various needs and has poor functionality.

[0004] Therefore, it is necessary to provide a connection structure between the scanning head mechanism and the laser positioning lamp, as well as a corresponding scanning device, to solve the above-mentioned technical problems. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a connection structure between the scanning head mechanism and the laser positioning lamp, as well as a corresponding scanning device.

[0006] The present invention provides a connection structure for a scanning head mechanism and a laser positioning light, which includes a sliding plate and a frame component. The scanning head mechanism includes an electrical control box and a scanning head body.

[0007] Two frame components are slidably connected to both sides of the bottom center line of the electronic control box. The sliding direction of the two frame components is parallel to the bottom center line of the electronic control box. The two frame components are housed side by side at the bottom of the electronic control box to connect to one scanning head body. The two frame components slide in opposite directions and extend out of the side of the electronic control box to connect two scanning head bodies.

[0008] The two sliding plates are slidably connected to both sides of the electrical control box. The laser positioning lights are detachably connected to the sliding plates. The two laser positioning lights are tilted towards the scanning area below the scanning mechanism to project light, which is used to assist the same scanning head body in positioning scanning, or the two laser positioning lights correspond one-to-one to assist the two scanning head bodies in positioning scanning.

[0009] In this invention, the sliding plate has an L-shaped structure and slides over the top and side surfaces of the electrical control box. The plate opposite the side surface of the electrical control box has an elongated connecting hole, through which screws pass to connect to the electrical control box.

[0010] The electrical control box has a port at its bottom, and a rib plate is fixedly connected to the middle of the port. The inner wall of the electrical control box and the side of the rib plate are provided with connecting grooves for sliding connection with the frame component.

[0011] Furthermore, each of the two frame members has an extension rod extending from one end of the electrical control box.

[0012] In this invention, the frame component is provided with a plurality of mounting holes for connecting to the scanning head body, and the frame component is provided with locking holes for connecting screws to lock the electrical control box and the frame component.

[0013] The present invention also includes a scanning device that uses the above-described connection structure of the scanning head mechanism and the laser positioning lamp, and further includes two rotating devices and a light shield.

[0014] Two rotating devices are arranged on both sides of the scanning mechanism, and each rotating device surrounds the outside of one of the laser positioning lights. The rotating device includes a rotating light shield that blocks or avoids the laser positioning light, thereby achieving the on / off effect of the laser positioning light. The rotating device is connected to the sliding plate.

[0015] The light shield is disposed between the laser positioning light and the emission surface and the light shield plate. The light shield is fixedly connected to the laser positioning light by means of snap-fit ​​connection or screw connection. The light shield is provided with an opening for the laser positioning light to project light. The laser positioning light is turned on or off by whether the opening is blocked by the light shield plate.

[0016] In this invention, the rotating device further includes a mounting frame, a motor, a first transmission roller, a second transmission roller, and a transmission belt. A mounting frame is provided on one side of the scanning mechanism. The first transmission roller and the second transmission roller are both rotatably connected to the mounting frame. The motor is fixedly connected to the mounting frame, and the output shaft of the motor is fixedly connected to the first transmission roller. A transmission belt is sleeved on the surface of the first transmission roller and the second transmission roller, and the light-shielding plate is fixedly connected to the surface of the transmission belt.

[0017] The two transmission belts are located at both ends of the light-shielding plate, with a through space in the middle. There is a through space between adjacent light-shielding plates. When the through space is aligned with the opening, light can be projected downwards.

[0018] The light-shielding frame has a groove at its bottom that runs through the direction of the transmission belt. The inner walls of the groove are provided with guide grooves. The two ends of the light-shielding plate are provided with connecting posts for connecting to the transmission belt. The light-shielding plate is provided with a fixing rod, and a roller is provided on the fixing rod. The roller moves along the guide groove as the transmission belt runs. The outer periphery of the roller is covered with a rubber sleeve.

[0019] Furthermore, the laser positioning light is connected to the scanning mechanism via a connecting rod, and the connecting rod is detachably connected to the scanning mechanism. The mounting bracket is connected to the scanning mechanism via a telescopic rod, and the telescopic rod is provided with a locking nut. The fixed rod at one end of the light shield away from the scanning mechanism is elastically slidably connected to the light shield, and the sliding direction is consistent with the extension and retraction direction of the telescopic rod. The fixed rod at the other end is fixedly connected to the light shield.

[0020] In this invention, two movable plates are slidably arranged side by side on the side of the light shield near the laser positioning light. The sliding direction of the two movable plates is consistent with the running direction of the transmission belt. The width of the movable plates is adjusted by sliding, thereby adjusting the duration of light shielding the laser positioning light.

[0021] The two movable plates are elastically slidably connected to the light shield. The two movable plates are provided with a pressure slope on their side that is close to each other. An adjusting member is slidably connected to the light shield. One end of the adjusting member extends between the two movable plates to press the pressure slope, and the other end extends to the outer surface of the light shield. The adjusting member is locked to the light shield with screws.

[0022] The mounting bracket is detachably equipped with a straight bar, which is used to press the multiple adjusting components to move synchronously.

[0023] Compared with related technologies, the scanning device provided by the present invention uses a sliding plate to connect with a laser positioning lamp and a rotating device. At the same time, one or two scanning head bodies can be connected to the bottom of the electrical control box, so that different numbers of scanning head bodies and different numbers of laser positioning lamps can be used in combination, resulting in diverse modes and strong functionality.

[0024] In addition, the scanning device of the present invention drives multiple light-shielding plates to move at a certain frequency through a transmission belt, thereby stably and periodically blocking the laser positioning light. The laser positioning light only needs to remain constantly lit, that is, the laser positioning light is turned on and off using a mechanical structure, and the on and off frequency is stable. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a preferred embodiment of the scanning device of the present invention;

[0026] Figure 2 This is a schematic diagram of the connection structure between the electrical control box and the frame component in this invention;

[0027] Figure 3 This is a front view showing the laser positioning light, rotating device, and light shielding frame working together in this invention.

[0028] Figure 4 This is a schematic diagram of the structure of the light shield of the scanning device of the present invention;

[0029] Figure 5 This is a schematic diagram of the adjusting component in this invention.

[0030] The following are the labeling elements in the diagram: 11. Electrical control box; 12. Scanner head body; 13. Sliding plate; 14. Frame component; 141. Mounting hole; 142. Locking hole; 15. Rib plate; 16. Connecting groove; 2. Positioning lamp body; 3. Rotating device; 31. Mounting bracket; 32. Motor; 33. First transmission roller; 34. Second transmission roller; 35. Transmission belt; 36. Light shield; 361. Fixed rod; 362. Roller; 363. Connecting column; 364. Movable plate; 3641. Pressure inclined surface; 365. Screw; 366. Straight strip plate; 367. Adjusting component; 368. Sliding block; 4. Light shield frame; 41. Opening; 5. Assembly base; 6. Telescopic rod; 7. Connecting rod. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Directional terms used in this invention, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "side," "top," and "bottom," are only for reference to the orientation in the accompanying drawings and are used to illustrate and understand the invention, not to limit it.

[0032] The terms "first" and "second" used in the terminology of this invention are for descriptive purposes only and should not be construed as indicating or implying relative importance, nor as limiting the order of events.

[0033] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, a connection can be a detachable connection or a connection of an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components or an interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] In existing technologies, a scanning head is typically used in conjunction with a laser positioning light. However, in some cases, to improve positioning accuracy, two laser positioning lights are used in conjunction with a scanning head, or two scanning heads are used in conjunction with two laser positioning lights to form two sets of scanning modules. Existing equipment cannot be applied to various demand scenarios and has poor functionality.

[0035] Furthermore, current technologies typically use pure software to control the on / off state of the laser positioning light. However, software-controlled laser positioning light illumination is unstable and cannot synchronize the scanning head exposure time with the laser positioning light's on / off time. The laser positioning light can affect the image quality captured by the scanning head. For example, if the laser positioning light is not turned off during scanning head exposure and imaging, the acquired image will have laser spotlights. Images with these spotlights cannot be decoded and recognized, or may lead to recognition errors.

[0036] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0037] Please see Figure 1 and Figure 3 The present invention provides a scanning device with a movable laser positioning light, which includes a scanning mechanism, a laser positioning light 2, a rotating device 3, and a light shield 4.

[0038] The scanning mechanism includes an electronic control box 11, a scanning head body 12, and a sliding plate 13. One or two scanning head bodies 12 are detachably connected to the bottom of the electronic control box 11, and the sliding plate 13 is slidably connected to both sides of the electronic control box 11. The electronic control box 11 contains a control circuit module that is electrically connected to the scanning head body 12.

[0039] Two laser positioning lights 2 are detachably connected to the sliding plate 13 via connecting rods 7. The two laser positioning lights 2 are tilted towards the scanning area below the scanning mechanism to project light. Based on the principle of laser ranging, the laser is first projected onto the surface of the object being measured, and then reflected back to the sensor in the scanning head body. Based on this, the distance between the object and the laser can be calculated, the position of the object in space can be determined, and the reference scanning start layer or scanning end layer can be determined, thereby assisting the scanning head body 12 in positioning scanning. It can be used to determine the reference scanning start layer or scanning end layer during positioning scanning, thereby assisting the scanning mechanism in positioning scanning.

[0040] When a scanning head body 12 is connected to the bottom of the control box 11, the positions of the two laser positioning lights 2 need to be adjusted to be centered so that the two laser positioning lights 2 can assist the same scanning head body 12 in positioning scanning. The two laser positioning lights 2 project light into the scanning area for positioning, and the two sets of data are combined to achieve high-precision positioning.

[0041] When the bottom of the control box 11 is connected to the two scanning head bodies 12, it is necessary to adjust the misalignment of the two laser positioning lights 2. Each laser positioning light 2 projects light onto the scanning area below the corresponding scanning head body 12. The two laser positioning lights 2 correspond one-to-one to assist the two scanning head bodies 12 in positioning and scanning.

[0042] Two rotating devices 3 are respectively located on both sides of the scanning mechanism and surround the laser positioning lamp 2. Each rotating device 3 includes a mounting frame 31, a motor 32, a first transmission roller 33, a second transmission roller 34, a transmission belt 35, and a light-shielding plate 36. The mounting frame 31 is located on one side of the scanning mechanism. The first transmission roller 33 and the second transmission roller 34 are rotatably connected to the mounting frame 31. The motor 32 is fixedly connected to the mounting frame 31, and the output shaft of the motor 32 is fixedly connected to the first transmission roller 33. A transmission belt 35 is fitted onto the surface of the first transmission roller 33 and the second transmission roller 34, and a light-shielding plate 36 is fixedly connected to the surface of the transmission belt 35. It should be noted that the two transmission belts 35 are located at both ends of the light-shielding plate 36, with a through space in the middle. That is, there is a through space between adjacent light-shielding plates 36. When the through space is aligned with the opening 41, light can be projected downwards.

[0043] The light shield 4 is set between the laser positioning light 2 and the emission surface and the light shield 36. The light shield 4 is provided with an opening 41 for the laser positioning light 2 to project light. The laser positioning light 2 is turned on or off by whether the light shield 36 blocks the opening 41.

[0044] Motor 32 drives multiple light-shielding plates 36 to move at a certain frequency, thereby stably and periodically blocking the laser positioning light 2. The laser positioning light 2 only needs to remain constantly lit, which is equivalent to using a mechanical structure to realize the on and off of the laser positioning light, and the on and off frequency is stable.

[0045] Please refer to Figure 1 , Figure 1 There are two scanning head bodies 12 connected in the middle. In this embodiment, the sliding plate 13 has an L-shaped structure. The sliding plate 13 slides and covers the top and side surfaces of the control box 11, and the connection is stable. The sliding plate 13 and the side surface of the control box 11 are provided with elongated connecting holes. Screws pass through the connecting holes and are connected to the control box 11. Loosening the screws allows for sliding adjustment.

[0046] Please refer to Figure 2 , Figure 2The two frame components 14 are in a sliding, away-from-each-other state, and can be used to connect two scanning head bodies 12. In this embodiment, two frame components 14 are slidably connected to both sides of the bottom center line of the electronic control box 11. The sliding direction of the two frame components 14 is parallel to the bottom center line of the electronic control box 11. The two frame components 14 are housed side by side at the bottom of the electronic control box 11 to connect one scanning head body 12. The two frame components 14 slide in opposite directions and extend out of the side of the electronic control box 11 to connect two scanning head bodies 12.

[0047] The bottom of the electrical control box 11 has a port (please refer to the bottom). Figure 1 (view orientation) Figure 2 The bottom port of the control box 11 is rotated upwards. A rib plate 15 is fixedly connected to the middle of the port. Connecting grooves 16 for sliding connection with the frame member 14 are provided on the inner wall of the control box 11 and the side of the rib plate 15. Extension rods are provided at the ends of the two frame members 14 extending out of the control box 11 to facilitate a more balanced and stable connection with the scanning head body 12. The frame member 14 is provided with multiple mounting holes 141 for connecting with the scanning head body 12, and locking holes 142 for connecting screws to lock the control box 11 and the frame member 14.

[0048] Please refer to Figure 4 In this embodiment, the bottom of the light-shielding frame 4 is provided with a groove 42 that runs through the transmission belt 35. The inner walls of both sides of the groove 42 are provided with guide grooves 43. The two ends of the light-shielding plate 36 are provided with connecting posts 363 for connecting to the transmission belt 35. A fixing rod 361 is provided on the light-shielding plate 36, and a roller 362 is provided on the fixing rod 361. The roller 362 moves along the guide grooves 43 as the transmission belt 35 runs. Since the transmission belt 35 rotates in a ring, the light-shielding plate 36 and the transmission belt 35 may become loose and unstable. The guide grooves 43 restrict the movement of the light-shielding plate 36, thereby improving the stability of the light-shielding plate 36 in sealing and blocking the opening 41.

[0049] Optionally, the outer periphery of the roller 362 may be covered with a rubber sleeve to reduce the impact force between the roller 362 and the guide groove 43, resulting in less wear and quieter operation.

[0050] Optionally, an elastic rubber strip is embedded on the inner surface of the guide groove 43 for flexible contact with the roller 362, which also reduces the impact force between the roller 362 and the guide groove 43 and reduces wear.

[0051] In addition, the end of the guide channel 43 is provided with a guide slope for guiding the roller 362.

[0052] Please refer to Figure 1In this embodiment, the light shield 4 and the laser positioning light 2 can be fixedly connected by means of snap-fit ​​connection, screw connection, etc. The laser positioning light 2 is connected to the scanning mechanism through the connecting rod 7, and the connecting rod 7 is detachably connected to the scanning mechanism. The mounting bracket 31 is connected to the scanning mechanism through the telescopic rod 6. The scanning mechanism is provided with an assembly seat 5 connected to the telescopic rod 6. The telescopic rod 6 is provided with a locking nut. The fixed rod 361 at the end of the light shield 36 away from the scanning mechanism is elastically slidably connected to the light shield 36 (that is, an elastic element is provided between the fixed rod 361 and the light shield 36, and the elastic force is along the sliding direction). The sliding direction is consistent with the extension and retraction direction of the telescopic rod 6. The fixed rod 361 at the other end is fixedly connected to the light shield 36.

[0053] When the laser positioning light 2 needs to be disassembled, simply remove the connecting rod 7 from the scanning mechanism, then pull the light shield 4 and press it against the elastically sliding fixed rod 361. This will disconnect the connection between the fixed rod 361 and the light shield 4. Then, move the light shield 4 closer to the elastically sliding fixed rod 361 to disconnect the connection between the fixed rod 361 and the light shield 4. The laser positioning light 2 can then be removed from the rotating device 3. Installation is performed by reversing the above steps; disassembly and assembly are very convenient.

[0054] Please refer to Figure 4 and Figure 5 In this embodiment, two movable plates 364 are slidably arranged side by side on the side of the light shield 36 close to the laser positioning lamp 2. The sliding direction of the two movable plates 364 is consistent with the running direction of the transmission belt 35. The movable plates 364 adjust their width by sliding, thereby adjusting the duration of light shielding the laser positioning lamp 2 to adapt to different scanning requirements.

[0055] Furthermore, the two movable plates 364 are elastically slidably connected to the light-shielding plate 36 (i.e., an elastic element is provided between the movable plates 364 and the light-shielding plate 36, and the elastic force is along the sliding direction). The side of the two movable plates 364 that is close to each other is provided with a pressure-bearing inclined surface 3641. An adjusting element 367 is slidably connected to the light-shielding plate 36. One end of the adjusting element 367 extends between the two movable plates 364 to press the pressure-bearing inclined surface 3641, and the other end extends to the outer surface of the light-shielding plate 36. Slider blocks 368 are provided on both sides of the adjusting element 367. The light-shielding plate 36 is provided with a sliding groove that is slidably connected to the slider block 368. The adjusting element 367 is locked to the light-shielding plate 36 with screws 365. Tightening the screws 365 will cause the slider block 368 to press against the sliding groove, thereby forming a fixed position.

[0056] Furthermore, a detachable straight plate 366 is provided on the mounting bracket 31. After loosening the screws 365 on multiple adjusting components 367, the straight plate 366 can be used to press the multiple adjusting components 367 to move synchronously, thereby causing the movable plates 364 on the multiple light-shielding plates 36 to slide the same distance, resulting in synchronized and faster adjustment. The straight plate 366 can be fixed to the side of the mounting bracket 31 by a snap-fit ​​mechanism.

[0057] When the scanning device with an active laser positioning lamp provided by the present invention is working, the motor 32 drives the transmission belt 35 to rotate cyclically, and the laser positioning lamp 2 is always on. Under the cyclic blocking or avoidance operation of the light shield 36, the laser positioning lamp 2 will form a certain frequency of on and off operation in the scanning area. The scanning mechanism will take multiple frames of images during the off period. Among them, the frame image close to the one before it is turned off and the frame image close to the one that is turned on again will be discarded, and the multiple frames in the middle will be used for decoding and recognition. The recognition is stable and the error rate is low.

[0058] The scanning device with movable laser positioning light in this embodiment is connected to the laser positioning light and the rotating device by using a sliding plate. At the same time, one or two scanning head bodies can be connected to the bottom of the electrical control box, so that different numbers of scanning head bodies and different numbers of laser positioning lights can be used in combination, resulting in diverse modes and strong functionality.

[0059] In addition, the scanning device with a movable laser positioning light in this embodiment drives multiple light-shielding plates to move at a certain frequency via a transmission belt, thereby stably and periodically blocking the laser positioning light. The laser positioning light only needs to remain constantly lit, that is, the laser positioning light is turned on and off using a mechanical structure, and the on and off frequency is stable.

[0060] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A connection structure between a scanning head mechanism and a laser positioning light, characterized in that, The scanning head mechanism includes a sliding plate (13) and a frame (14), and includes an electrical control box (11) and a scanning head body (12). Two frame components (14) are slidably connected to both sides of the bottom center line of the electronic control box (11). The sliding direction of the two frame components (14) is parallel to the bottom center line of the electronic control box (11). The two frame components (14) are housed side by side at the bottom of the electronic control box (11) to connect to one of the scanning head bodies (12). The two frame components (14) slide in opposite directions and extend out of the side of the electronic control box (11) to connect to the two scanning head bodies (12). The two sliding plates (13) are slidably connected to the two sides of the electrical control box (11). The laser positioning lamp (2) is detachably connected to the sliding plate (13). The two laser positioning lamps (2) are tilted towards the scanning area below the scanning mechanism to project light, which is used to assist the same scanning head body (12) in positioning scanning, or the two laser positioning lamps (2) are used to assist the two scanning head bodies (12) in positioning scanning in a one-to-one correspondence.

2. The connection structure between the scanning head mechanism and the laser positioning lamp according to claim 1, characterized in that, The sliding plate (13) has an L-shaped structure. The sliding plate (13) slides over the top and side surfaces of the electrical control box (11). The sliding plate (13) has a long strip-shaped connection hole on the plate body opposite to the side surface of the electrical control box (11). Screws pass through the connection hole and connect to the electrical control box (11).

3. The connection structure between the scanning head mechanism and the laser positioning lamp according to claim 1, characterized in that, The bottom of the electrical control box (11) is provided with a port, and a rib plate (15) is fixedly connected to the middle of the port. The inner wall of the electrical control box (11) and the side of the rib plate (15) are provided with connecting grooves (16) for sliding connection with the frame component (14).

4. The connection structure between the scanning head mechanism and the laser positioning lamp according to claim 1, characterized in that, Both of the frame members (14) are provided with an extension rod extending from one end of the electrical control box (11).

5. The connection structure between the scanning head mechanism and the laser positioning lamp according to claim 1, characterized in that, The frame (14) is provided with a plurality of mounting holes (141) for connecting to the scanning head body (12), and the frame (14) is provided with locking holes (142) for connecting screws to lock the electrical control box (11) and the frame (14).

6. A scanning device, characterized in that, The connection structure of the scanning head mechanism and the laser positioning lamp as described in any one of claims 1-5 further includes two rotating devices (3) and a light shield (4); Two rotating devices (3) are arranged on both sides of the scanning mechanism, and each rotating device (3) surrounds the outside of one of the laser positioning lamps (2). The rotating device (3) includes a rotating light shield (36) that blocks or avoids the laser positioning lamp (2) to achieve the on / off effect of the laser positioning lamp (2). The rotating device (3) is connected to the sliding plate (13). The light shield (4) is disposed between the laser positioning light (2), the emission surface and the light shield (36). The light shield (4) is fixedly connected to the laser positioning light (2) by means of snap-fit ​​connection or screw connection. The light shield (4) is provided with an opening (41) for the laser positioning light (2) to project light. The laser positioning light (2) is turned on or off by whether the light shield (36) blocks the opening (41).

7. The scanning device according to claim 6, characterized in that, The rotating device (3) further includes a mounting frame (31), a motor (32), a first transmission roller (33), a second transmission roller (34), and a transmission belt (35). The mounting frame (31) is provided on one side of the scanning mechanism. The first transmission roller (33) and the second transmission roller (34) are rotatably connected to the mounting frame (31). The motor (32) is fixedly connected to the mounting frame (31), and the output shaft of the motor (32) is fixedly connected to the first transmission roller (33). The first transmission roller (33) and the second transmission roller (34) are fitted with a transmission belt (35), and the light shield (36) is fixedly connected to the surface of the transmission belt (35). The two transmission belts (35) are located at the two ends of the light shield (36) respectively, with a through space in the middle. There is a through space between adjacent light shields (36). When the through space is aligned with the opening (41), light can be projected downwards.

8. The scanning device according to claim 7, characterized in that, The bottom of the light-shielding frame (4) is provided with a groove (42) that runs through the transmission belt (35) in the direction of travel. The inner walls of both sides of the groove (42) are provided with guide grooves (43). The two ends of the light-shielding plate (36) are provided with connecting posts (363) for connecting with the transmission belt (35). The light-shielding plate (36) is provided with a fixing rod (361). The fixing rod (361) is provided with a roller (362). The roller (362) moves along the guide groove (43) as the transmission belt (35) runs. The outer periphery of the roller (362) is covered with a rubber sleeve.

9. The scanning device according to claim 8, characterized in that, The laser positioning light (2) is connected to the scanning mechanism via a connecting rod (7). The connecting rod (7) is detachably connected to the scanning mechanism. The mounting bracket (31) is connected to the scanning mechanism via a telescopic rod (6). The telescopic rod (6) is provided with a locking nut. The fixed rod (361) on the light shield (36) at one end away from the scanning mechanism is elastically slidably connected to the light shield (36). The sliding direction is consistent with the extension and retraction direction of the telescopic rod (6). The fixed rod (361) at the other end is fixedly connected to the light shield (36).

10. The scanning device according to claim 7, characterized in that, Two movable plates (364) are slidably arranged side by side on the side of the light shield (36) close to the laser positioning light (2). The sliding direction of the two movable plates (364) is consistent with the running direction of the transmission belt (35). The movable plates (364) adjust their width by sliding, thereby adjusting the duration of light shielding the laser positioning light (2). The two movable plates (364) are elastically slidably connected to the light shield (36). The side of the two movable plates (364) that is close to each other is provided with a pressure slope (3641). An adjusting member (367) is slidably connected to the light shield (36). One end of the adjusting member (367) extends between the two movable plates (364) to press the pressure slope (3641), and the other end extends to the outer surface of the light shield (36). The adjusting member (367) is locked to the light shield (36) with a screw (365). The mounting bracket (31) is detachably provided with a straight bar (366), which is used to press the multiple adjusting members (367) to move synchronously.

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