Target fixing device and laser three-dimensional scanning system

Abstract

The utility model relates to the technical field of laser scanning, and provides a target fixing device and a laser three-dimensional scanning system.The target fixing device comprises a first fixing block and a second fixing block, and the first fixing block and the second fixing block are detachably connected; the end face, facing the second fixing block, of the first fixing block is provided with a positioning protrusion. The end face, deviating from the second fixing block, of the first fixing block is used for being connected with a to-be-measured object. A positioning groove matched with the positioning protrusion in shape is formed in the end face, facing the first fixing block, of the second fixing block, a target fixing piece is arranged on the end face, deviating from the first fixing block, of the second fixing block, and a target is installed on the target fixing piece. Accurate positioning and installation of the target can be directly achieved according to the positioning protrusions and the positioning grooves, the installation time and position correction time of the target are shortened, time and labor are saved, meanwhile, the installation efficiency and installation quality of the target are improved, and then the three-dimensional scanning quality and efficiency are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of laser scanning technology, in particular to a target fixing device and a laser three-dimensional scanning system. BACKGROUND

[0002] Laser three-dimensional scanning technology plays an increasingly important role in many fields such as industrial manufacturing, architectural design, medical imaging, etc. Its high-precision spatial positioning capability enables engineers and designers to obtain detailed geometric information of objects, thereby enabling precise modeling and analysis. Before scanning a large object using a laser three-dimensional scanner, a target is generally fixedly installed on the surface of the object to be measured. The laser three-dimensional scanner obtains a reference coordinate by scanning the fixed target, and then performs scanning and spatial positioning according to the reference coordinate. Since the three-dimensional scanning precision is very high, it is required that the position of the target be absolutely fixed. Any vibration or deviation will cause confusion in spatial positioning, and the scanned model will not match the actual object at all. In order to ensure the accuracy of the scanning result, the installation of the target is crucial.

[0003] At present, the target is usually installed by using magnetic attraction or dispensing to fix it on the surface of the object to be measured. Although these methods can ensure the stability of the target to some extent, they have significant limitations in actual application. The effect of the magnetic attraction method is affected by the material and shape of the object surface. The movement of the measured object during scanning may cause slight displacement of the target during scanning, thereby affecting the scanning precision. The dispensing method provides strong fixing force, but the installation and disassembly process takes a long time, and the curing time of the glue may cause a decrease in scanning efficiency. When scanning an object with many holes or a complex shape, it is required to adjust the precision of the scanner to a very high level to generate an accurate hole model. The target installation engineering is large, and the target is too valuable to be placed in the scanning site for a long time. When the scanning process needs to be completed at one time, the worker must not interrupt the operation before the scanning is completed, which causes the working time to be prolonged, and even requires overnight operation. When the scanning process needs to be completed over several days, the engineering quantity of disassembling and assembling the target every day is large, and in order to ensure the scanning precision, the worker needs to spend a lot of time to calibrate the installation precision, which is time-consuming and laborious. The slight installation error caused by repeated installation will also affect the scanning result, and reduce the scanning quality and scanning efficiency. SUMMARY

[0004] The problem solved by the present application is how to improve the installation precision and efficiency of the target.

[0005] To solve the above problems, the present application provides a target fixing device and a laser three-dimensional scanning system.

[0006] The first aspect of the present application provides a target fixing device, comprising a first fixing block and a second fixing block, and the first fixing block is detachably connected with the second fixing block;

[0007] An end surface of the first fixing block facing the second fixing block is provided with a positioning protrusion, and an end surface of the first fixing block facing away from the second fixing block is used for connecting with a to-be-tested object;

[0008] An end surface of the second fixing block facing the first fixing block is provided with a positioning groove matched with the positioning protrusion in shape, and an end surface of the second fixing block facing away from the first fixing block is provided with a target fixing part, and the target fixing part is used for mounting a target.

[0009] Optionally, the target fixing part comprises a connecting disc, an inner wall of the connecting disc is provided with a disc magnetic adsorption coating and a disc glue joint coating, and the disc magnetic adsorption coating and the disc glue joint coating are respectively used for adsorbing the target in the connecting disc.

[0010] Optionally, the target fixing part further comprises a connecting rod, one end of the connecting rod is connected with the end surface of the second fixing block facing away from the first fixing block, and the other end is connected with the connecting disc.

[0011] Optionally, the target fixing part further comprises a rotating shaft, the connecting rod is a hollow cylindrical structure, an end of the cylindrical structure close to the connecting disc is provided with an opening, the rotating shaft is rotatably arranged in the cylindrical structure, and the rotating shaft is detachably connected with the connecting disc.

[0012] Optionally, a first threaded hole is formed in the first fixing block, a second threaded hole coaxially arranged with the first threaded hole is formed in the second fixing block, and the first threaded hole and the second threaded hole are used for being connected by a bolt to fix the first fixing block relative to the second fixing block.

[0013] Optionally, a plurality of positioning protrusions and a plurality of positioning grooves are respectively arranged in an array, a protrusion magnetic adsorption coating is arranged on a surface of each positioning protrusion, and a groove magnetic adsorption coating is arranged on an inner wall of each positioning groove.

[0014] Optionally, the target fixing device further comprises an L-shaped accessory, the L-shaped accessory comprises a first connecting part and a second connecting part connected with each other, the first connecting part is connected with the first fixing block, the second connecting part is used for being connected with the to-be-tested object, and a flow hole is formed in the second connecting part.

[0015] Optionally, the target fixing device further comprises a connecting plate, a first end surface of the connecting plate is provided with a first magnetic attraction coating or a first adhesive coating, the first end surface is used for being adsorbed on the first fixing block through the first magnetic attraction coating or the first adhesive coating, and a second end surface of the connecting plate is provided with a second magnetic attraction coating or a second adhesive coating, the second end surface is used for being adsorbed on the object to be measured through the second magnetic attraction coating or the second adhesive coating.

[0016] Optionally, the first fixing block and the second fixing block are both made of metal materials.

[0017] In a second aspect, the present application provides a kind of laser three-dimensional scanning system, including the target fixing device as described above

[0018] The target fixing device of the present application has the following advantages: the first fixing block and the second fixing block are detachably connected, one end surface of the first fixing block is mounted on the object to be measured, the end surface of the first fixing block facing the second fixing block is provided with a positioning protrusion, the end surface of the second fixing block facing the first fixing block is provided with a positioning groove matching the positioning protrusion, and the end surface of the second fixing block away from the first fixing block is provided with a target fixing part. In use, the first fixing block is arranged on the object to be measured as a fixing base for the target, the target fixing part fixes the target on the second fixing block, the second fixing block is connected with the first fixing block, the positioning protrusion is connected with the positioning groove for positioning and fixing the second fixing block, preventing the second fixing block from moving due to vibration caused by movement of the object to be measured, and when the target needs to be removed for storage halfway through the scanning, the second fixing block can be directly removed, and when the target is installed again, the positioning protrusion and the positioning groove can be used to accurately position and install the target, reducing the installation time and position correction time of the target, avoiding the decline in scanning quality caused by position errors during multiple manual installations, saving time and effort while improving the installation efficiency and quality of the target, thereby improving the three-dimensional scanning quality and efficiency, and the flexible assembly method can be used in various occasions. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 FIG. 1 is a structural schematic diagram of the target fixing device of the present application;

[0020] Figure 2 FIG. 2 is an exploded structural schematic diagram of the target fixing device of the present application;

[0021] Figure 3 FIG. 3 is a perspective structural schematic diagram of the first fixing block of the present application;

[0022] Figure 4 FIG. 4 is a perspective structural schematic diagram of the second fixing block of the present application;

[0023] Figure 5 Fig. 2 is a perspective structural schematic diagram of a second fixing block and a target fixing device according to an embodiment of the present application;

[0024] Figure 6 Fig. 3 is a top structural schematic diagram of a connecting plate according to an embodiment of the present application.

[0025] Legend of reference signs:

[0026] 1 - first fixing block; 11 - positioning protrusion; 111 - protrusion magnetic attraction coating; 12 - first threaded hole;

[0027] 2 - second fixing block; 21 - positioning groove; 211 - groove magnetic attraction coating; 22 - second threaded hole;

[0028] 3 - target fixing piece; 31 - connecting plate; 311 - plate magnetic attraction coating; 312 - plate cementation coating; 313 - connecting hole; 32 - connecting rod; 33 - rotating shaft;

[0029] 4 - target; 5 - L-shaped fitting; 51 - first connecting part; 52 - second connecting part; 521 - through-flow hole; 6 - connecting plate. DETAILED DESCRIPTION

[0030] In order to make the above objectives, characteristics and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings. Although some embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms, and should not be interpreted as being limited to the embodiments described herein, on the contrary, these embodiments are provided to make the present application more thorough and complete. It should be understood that the drawings and embodiments of the present application are only for exemplary purposes, and are not intended to limit the scope of protection of the present application.

[0031] The term "comprising" and its variants as used herein are open-ended, that is "including but not limited to"; the term "based on" is "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". Related definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present application are only used to distinguish different devices, modules or units, and are not intended to limit the order or interdependence of the functions performed by these devices, modules or units.

[0032] It should be noted that the modification of "one" or "multiple" mentioned in the present application is illustrative and not limiting, and those skilled in the art should understand that, unless otherwise explicitly indicated in the context, it should be understood as "one or more".

[0033] As Figures 1 to 6 shown, the target fixing device provided by the embodiment of the present application comprises a first fixing block 1 and a second fixing block 2, and the first fixing block 1 and the second fixing block 2 are detachably connected.

[0034] The end surface of the first fixing block 1 facing the second fixing block 2 is provided with a positioning protrusion 11, and the end surface of the first fixing block 1 facing away from the second fixing block 2 is used for connecting with a measured object.

[0035] The end surface of the second fixing block 2 facing the first fixing block 1 is provided with a positioning groove 21 matched with the shape of the positioning protrusion 11, and the end surface of the second fixing block 2 facing away from the first fixing block 1 is provided with a target fixing member 3, and the target fixing member 3 is used for mounting a target 4.

[0036] Specifically, as Figure 1 shown, the first fixing block 1 and the second fixing block 2 are both rectangular structures, and in the embodiment, the first fixing block 1 and the second fixing block 2 are cuboids and are stacked, the second fixing block 2 is stacked on the first fixing block 1, and the first fixing block 1 and the second fixing block 2 are detachably connected through, for example, magnetic attraction, glue joint, bolt connection and the like. The end surface of the first fixing block 1 connected with the second fixing block 2 is provided with a positioning protrusion 11, and the number of the positioning protrusion 11 is at least one, as Figure 2 shown, and in the embodiment, the positioning protrusion 11 is provided in plurality, the end surface of the first fixing block 1 facing away from the second fixing block 2 is used for connecting with a measured object, and can be detachably connected on the measured object through, for example, magnetic attraction, glue joint, bolt connection and the like. Correspondingly, the end surface of the second fixing block 2 connected with the first fixing block 1 is provided with a positioning groove 21 matched with the positioning protrusion 11, when the first fixing block 1 is connected with the second fixing block 2, the positioning protrusion 11 is embedded in the positioning groove 21, so as to prevent the second fixing block 2 from being displaced relative to the first fixing block 1. The end surface of the second fixing block 2 facing away from the first fixing block 1 is provided with a target fixing member 3, for example, a fixing rod, a fixing frame matched with the target 4 and the like, and the target 4 is mounted on the target fixing member 3, so as to mount the target 4 on the second fixing block 2.

[0037] It should be noted that the first fixing block 1 can also be irregularly shaped, that is, the end surface of the first fixing block 1 facing away from the second fixing block 2 can be shaped to be matched with a measured object, for example, arc-shaped, so as to improve the mounting stability of the target fixing device.

[0038] In the embodiment, the first fixing block 1 and the second fixing block 2 are detachably connected, one end surface of the first fixing block 1 is mounted on the measured object, the end surface of the first fixing block 1 facing the second fixing block 2 is provided with a positioning protrusion 11, the end surface of the second fixing block 2 facing the first fixing block is provided with a positioning groove 21 matched with the positioning protrusion 11, the end surface of the second fixing block 2 away from the first fixing block 1 is provided with a target fixing part 3, and the target 4 is fixed on the second fixing block 2 through the target fixing part 3. In use, the first fixing block 1 is arranged on the measured object as a fixed base of the target 4, the target fixing part 3 fixes the target 4 on the second fixing block 2, the second fixing block 2 is connected with the first fixing block 1, the positioning protrusion 11 is connected with the positioning groove 21 to fix the second fixing block 2 and prevent the second fixing block 2 from being displaced due to vibration caused by movement of the measured object, and when the target 4 needs to be removed for storage when scanning is half completed, the second fixing block 2 can be directly removed, and when the target 4 is installed again, the target 4 can be accurately positioned and installed according to the positioning protrusion 11 and the positioning groove 21, the installation time and position correction time of the target 4 are reduced, the installation efficiency and installation quality of the target 4 are improved, the three-dimensional scanning quality and efficiency are improved, and the flexible assembly mode can cope with various occasions.

[0039] Optionally, the target fixing part 3 comprises a connecting disc 31, an inner wall of the connecting disc 31 is provided with a disc magnetic adsorption coating 311 and a disc adhesive coating 312, and the disc magnetic adsorption coating 311 and the disc adhesive coating 312 are respectively used for adsorbing the target 4 in the connecting disc 31.

[0040] Specifically, the target 4 in the prior art is usually a target ball, and the collected scanning data is easy to process and analyze in the later stage, so that, as shown in Figure 1 , the target 4 of the embodiment also adopts a target ball, but is not limited to only a target ball, and can also be other shapes of targets 4, such as box-shaped targets, cylindrical targets, etc. As shown in Figure 5 , in order to ensure the stability of the target ball, the target fixing part can comprise a connecting disc 31, the inner wall shape of the connecting disc 31 matches the shape of the target ball, and the target ball is prevented from rolling in scanning. As shown in Figure 6 , the inner wall of the connecting disc 31 is provided with a disc magnetic adsorption coating 311, which can adsorb the target ball with magnetic or metal material on the connecting disc 31, and increase the connection stability of the target ball and the connecting disc 31. The inner wall of the connecting disc 31 is also provided with a disc adhesive coating 312, and when needed, a sticky note or the like is applied on the disc adhesive coating 312 to bond the target ball on the connecting disc 31, further increasing the connection stability of the target ball and the connecting disc 31.

[0041] It should be noted that the disc glue coating layer 312 and the disc magnetic attraction coating layer 311 can be used according to the mass and material of the target ball, for example, when the target ball is a non-metal material or a material without magnetism, the disc glue coating layer 312 is used to set the target ball on the connecting disc 31, when the target ball is a material with magnetism, the disc magnetic attraction coating layer 311 is used to set the target ball on the connecting disc 31, when the target ball is a material with magnetism and has a heavy mass, the disc glue coating layer 312 and the disc magnetic attraction coating layer 311 are used to set the target ball on the connecting disc 31 at the same time, thereby increasing the connection stability.

[0042] Optionally, the target fixing part 3 further comprises a connecting rod 32, one end of the connecting rod 32 is connected to the end face of the second fixing block 2 away from the first fixing block 1, and the other end is connected to the connecting disc 31.

[0043] Specifically, as shown in Figure 1 and 2 Since the three-dimensional scanning device will block the target 4 when scanning, part of the target 4 may not be scanned, which affects the scanning result. Therefore, the connecting rod 32 is arranged to increase the distance between the target 4 and the end face of the second fixing block 2 away from the measured object, that is, one end of the connecting rod 32 is arranged on the end face of the second fixing block 2 away from the first fixing block 1, and the other end is connected to the target 4, thereby reducing the probability of the target 4 being blocked and increasing the scanning quality.

[0044] In this embodiment, one end of the connecting rod 32 is arranged on the end face of the second fixing block 2 away from the first fixing block 1, and the other end is connected to the connecting disc 31, so that the target ball is arranged on the second fixing block 2 through the connecting disc 31.

[0045] It should be noted that if there are multiple target fixing devices, the length of the connecting rod 32 and the position installed on the second fixing block 2 are the same in the multiple target fixing devices. The position installed on the second fixing block 2 is usually the center point of the end face of the second fixing block 2 away from the first fixing block 1, so as to ensure the accuracy of the scanning result and the convenience of subsequent scanning result processing. For example, if the length of the connecting rod 32 is 5 cm, each scanning point is shortened by 5 cm inward after the scanning result is obtained, so as to obtain the geometric information of the measured object.

[0046] Optionally, the target fixing part 3 further comprises a rotating shaft 33, the connecting rod 32 is a hollow cylindrical structure, and the end of the cylindrical structure close to the connecting disc 31 has an opening, the rotating shaft 33 is rotatably arranged in the cylindrical structure, and the rotating shaft 33 is detachably connected to the connecting disc 31.

[0047] Specifically, the target fixing part further comprises a rotating shaft 33 for adjusting the angle of the target 4. As shown in Figure 5As shown, when the rotating shaft 33 is arranged, the connecting rod 32 is hollow inside and matches the shape of the rotating shaft, and the end of the connecting rod 32 away from the second fixed block 2 is open. In use, the rotating shaft 33 is arranged to rotate in the connecting rod 32 and is connected with the connecting disc 31 through the opening of the connecting rod 32, so that the connecting disc 31 can rotate. By rotating the connecting disc 31, the angle of the target 4 can be adjusted. For example, when the target 4 is a conical target, multiple conical targets can be adjusted to be uniformly oriented by rotating the connecting disc 31, thereby increasing the convenience of three-dimensional scanning.

[0048] Specifically, as shown in Figure 6 , the bottom of the connecting disc 31 is provided with a connecting hole 313, and the end of the rotating shaft 33 towards the connecting disc 31 is provided with a connecting hole corresponding to the connecting hole 313. The connecting disc 31 can be detachably connected to the rotating shaft 33 by bolts or other structures.

[0049] It should be noted that the outer wall of the rotating shaft 33 is provided with a protrusion, and the inner wall of the connecting rod 32 is provided with a corresponding recess. The protrusion and the recess are tightly connected to realize the rotating connection of the rotating shaft 33 and the connecting rod 32, and prevent the rotating shaft 33 from falling out of the connecting rod 32.

[0050] Optionally, a first threaded hole 12 is formed in the first fixed block 1, and a second threaded hole 22 coaxially arranged with the first threaded hole 12 is formed in the second fixed block 2. The first threaded hole 12 and the second threaded hole 22 are used to be connected by bolts to fix the first fixed block 1 relative to the second fixed block 2.

[0051] Specifically, as shown in Figure 3 and Figure 4 , a first threaded hole 12 is formed at the edge position of the first fixed block 1, and a second threaded hole 22 is formed at the corresponding position of the second fixed block 2. The first threaded hole 11 and the second threaded hole 22 are coaxially arranged. In use, the first threaded hole 11 and the second threaded hole 22 are connected by bolts to fixedly connect the first fixed block 1 and the second fixed block 2, thereby improving the stability of the target 4 after installation, avoiding displacement of the target 4 caused by vibration of the measured object, and further affecting the scanning result.

[0052] Optionally, as shown in Figure 3 and Figure 4 , a plurality of positioning protrusions 11 and a plurality of positioning recesses 21 are arranged respectively, and a protrusion magnetic attraction coating 111 is arranged on the surface of each positioning protrusion 11. A recess magnetic attraction coating 211 is arranged on the inner wall of each positioning recess 21, thereby increasing the stability of the connection between the first fixed block 1 and the second fixed block 2.

[0053] Optionally, the target fixing device further comprises an L-shaped accessory 5, the L-shaped accessory 5 comprises a first connecting part 51 and a second connecting part 52 connected with each other, the first connecting part 51 is connected with the first fixing block 1, the second connecting part 52 is used for connecting with the object to be measured, and a flow hole 521 is formed in the second connecting part 52.

[0054] Specifically, the L-shaped accessory 5 is used for fixing the first fixing block 1 on the object to be measured. Figure 1 and Figure 2 As shown in the drawings, the L-shaped accessory 5 comprises a first connecting part 51 and a second connecting part 52 connected with each other, the first connecting part 51 is arranged on the circumferential end surface of the first fixing block 1, and can be detachably connected with the first fixing block 1 by means of magnetic attraction, glue joint, bolt connection or the like, or the first connecting part 51 is in abutment with the first fixing block 1, and the installation area for limiting the movement of the first fixing block 1 is formed by surrounding the first fixing block 1 with a plurality of L-shaped accessories 5, the second connecting part 52 is arranged on the object to be measured, and a flow hole 521 is formed in the second connecting part 52, and the second connecting part 52 is fixed on the object to be measured by means of spot welding or spot gluing through the flow hole 521.

[0055] It should be noted that the L-shaped accessory 5 is at least one, and in the embodiment, four L-shaped accessories are used, which are arranged on the four circumferential end surfaces of the first fixing block 1.

[0056] Optionally, the target fixing device further comprises a connecting plate 6, a first magnetic attraction coating or a first glue joint coating is arranged on the first end surface of the connecting plate 6, the first end surface is used for being adsorbed on the first fixing block 1 through the first magnetic attraction coating or the first glue joint coating, a second magnetic attraction coating or a second glue joint coating is arranged on the second end surface of the connecting plate 6, and the second end surface is used for being adsorbed on the object to be measured through the second magnetic attraction coating or the second glue joint coating.

[0057] Specifically, the connecting plate 6 comprises a first end surface and a second end surface, the first end surface is an end surface facing the first fixing block 1, and the second end surface is an end surface facing the object to be measured, and the first end surface and the second end surface can be connected with the first fixing block 1 and the object to be measured through the first magnetic attraction coating or the first glue joint coating, the second magnetic attraction coating or the second glue joint coating respectively. It should be noted that the first end surface and the second end surface of the connecting plate 6 are usually equal in shape and area to the end surface of the first fixing block 1 facing the object to be measured.

[0058] It should be noted that the connecting plate 6 and the L-shaped accessory 5 can be used at the same time, and can be adjusted according to the actual situation, which is not limited here.

[0059] Optionally, the first fixing block 1 and the second fixing block 2 are both made of metal material.

[0060] The laser three-dimensional scanning system provided by the embodiment of the present application comprises the target fixing device as described above.

[0061] The laser three-dimensional scanning system of the embodiment has the same beneficial effects as the target fixing device described above, and thus will not be described here again.

[0062] Although the present application is disclosed as above, the protection scope of the present application is not limited to this. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and these changes and modifications shall fall within the protection scope of the present application.

Claims

1. A target fixture, comprising: The first fixed block (1) and the second fixed block (2) are detachably connected; The end face of the first fixed block (1) facing the second fixed block (2) is provided with a positioning protrusion (11), and the end face of the first fixed block (1) away from the second fixed block (2) is used for connecting with the object to be measured; The end face of the second fixed block (2) facing the first fixed block (1) is provided with a positioning groove (21) matched with the shape of the positioning protrusion (11), and the end face of the second fixed block (2) away from the first fixed block (1) is provided with a target fixing part (3), and the target fixing part (3) is used for mounting a target (4).

2. The target fixture of claim 1, wherein, The target fixing part (3) comprises a connecting disc (31), and the inner wall of the connecting disc (31) is provided with a disc magnetic adsorption coating (311) and a disc glue joint coating (312), which are respectively used for adsorbing the target (4) in the connecting disc (31).

3. The target fixture of claim 2, wherein, The target fixing part (3) further comprises a connecting rod (32), one end of the connecting rod (32) is connected with the end face of the second fixed block (2) away from the first fixed block (1), and the other end is connected with the connecting disc (31).

4. The target fixture of claim 3, wherein, The target fixing part (3) further comprises a rotating shaft (33), the connecting rod (32) is a hollow cylindrical structure, and the end of the cylindrical structure close to the connecting disc (31) has an opening, the rotating shaft (33) is rotatably arranged in the cylindrical structure, and the rotating shaft (33) is detachably connected with the connecting disc (31).

5. The target fixture of claim 1, wherein, A first threaded hole (12) is formed in the first fixed block (1), a second threaded hole (22) coaxially arranged with the first threaded hole (12) is formed in the second fixed block (2), and the first threaded hole (12) and the second threaded hole (22) are used for being connected by bolts to fix the first fixed block (1) relative to the second fixed block (2).

6. The target fixture of claim 1, wherein, The positioning protrusions (11) and the positioning grooves (21) are respectively arranged in an array, and the surface of each positioning protrusion (11) is respectively provided with a protrusion magnetic adsorption coating (111), and the inner wall of each positioning groove (21) is respectively provided with a groove magnetic adsorption coating (211).

7. The target fixture of claim 1, wherein, Further comprising an L-shaped accessory (5), the L-shaped accessory (5) comprises a first connecting part (51) and a second connecting part (52) connected with each other, the first connecting part (51) is connected with the first fixed block (1), the second connecting part (52) is used for connecting with the object to be measured, and the second connecting part (52) is provided with a flow hole (521).

8. The target fixture of claim 1, wherein, Further comprising a connecting plate (6), a first end surface of the connecting plate (6) is provided with a first magnetic or adhesive coating, the first end surface is used to be adsorbed on the first fixed block (1) through the first magnetic or adhesive coating, a second end surface of the connecting plate (6) is provided with a second magnetic or adhesive coating, the second end surface is used to be adsorbed on the object to be measured through the second magnetic or adhesive coating.

9. The target fixture of claim 1, wherein, The first fixed block (1) and the second fixed block (2) are both made of metal material.

10. A laser three-dimensional scanning system, characterized by, A target fixing device comprising any one of claims 1 to 9.

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