CN111981936A - Quick measurement record instrument of car body sheet metal structure characteristic - Google Patents
Quick measurement record instrument of car body sheet metal structure characteristic Download PDFInfo
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- CN111981936A CN111981936A CN202010892507.8A CN202010892507A CN111981936A CN 111981936 A CN111981936 A CN 111981936A CN 202010892507 A CN202010892507 A CN 202010892507A CN 111981936 A CN111981936 A CN 111981936A
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- recording
- guide frame
- recording paper
- measuring
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/0025—Measuring of vehicle parts
Abstract
The invention discloses a rapid measuring and recording tool for the structural characteristics of a metal plate of an automobile body, which comprises a mounting seat, a measuring scale, a transverse guide frame, a vertical guide frame, a sliding table, a recording pen structure and recording paper, wherein the transverse guide frame, the vertical guide frame, the sliding table, the recording pen structure and the recording paper are arranged in the mounting seat; the device comprises a measuring scale, a vertical guide frame, a sliding table, a transverse guide groove, a sliding block and a vertical guide frame, wherein the vertical guide frame is at least provided with one group, the vertical guide groove is formed in the vertical guide frame and is in sliding connection with the sliding table, a sliding groove matched with the transverse guide groove is formed in the sliding table, and the sliding block in the sliding groove is fixedly connected with the measuring; one side of the sliding table facing the back plate is connected with a recording pen structure. The invention has the beneficial effects that: the tool can reproduce the section characteristics of the measured sheet metal structure on the recording roll paper in equal size, and has low cost and high precision.
Description
Technical Field
The invention relates to measuring equipment, in particular to a rapid measuring and recording tool for structural characteristics of a metal plate of an automobile body.
Background
In the development of automobile body structures, reference data is often obtained in the form of race product analysis and used to guide the design of the structure. The current common methods for measuring the structural characteristics of the vehicle body mainly comprise: 1. measuring the structural characteristics of the dimension and photo recording by a general measuring tool (such as a ruler, a vernier caliper and the like); 2. point cloud scanning and reverse modeling.
The method for measuring the structural characteristics of the dimension and photo record by using the universal measuring tool (such as a ruler, a vernier caliper and the like) specifically comprises the following steps: various characteristics of the vehicle body structure and the connection relation between the characteristics can be clearly observed through the photo record; the general measuring tools (such as a ruler, a tape measure and a vernier caliper) can be used for accurately obtaining the information such as the length, the width and the thickness of the part of the automobile body sheet metal structure. The general measuring tool can accurately acquire the thickness information of the structure, but continuous and variable profile characteristic parameter measurement is difficult to carry out, such as the size change of the sheet metal structure characteristics on a white vehicle body; the photo record can describe the structural characteristics and the connection mode of the sheet metal of the vehicle body more accurately. The two modes are combined, although certain guiding parameters can be provided for the design of the vehicle body structure, errors exist in manually collected data, and collection points of structural features are discontinuous.
The point cloud scanning and the reverse modeling belong to one kind of reverse engineering, can accurately and completely obtain detailed data of the automobile body metal plate structure, and can embody the characteristics and the size parameters of the automobile body metal plate structure. However, the point cloud data needs to be established by an independent and complete body-in-white structure, a large amount of time and energy are needed to complete the reverse modeling engineering, and the requirements on time, manpower and material resources are high.
Disclosure of Invention
The invention aims to provide a quick measuring and recording tool for the structural characteristics of a sheet metal structure of an automobile body, which is low in cost and small in error, aiming at overcoming the defects of the prior art, and is used for measuring the structural characteristics of the sheet metal structure of the automobile body and describing the cross section shape.
The technical scheme adopted by the invention is as follows: a rapid measuring and recording tool for the structural characteristics of a metal plate of an automobile body comprises a mounting seat, a measuring scale, a transverse guide frame, a vertical guide frame, a sliding table, a recording pen structure and recording paper, wherein the transverse guide frame, the vertical guide frame, the sliding table, the recording pen structure and the recording paper are arranged in the mounting seat; the device comprises a measuring scale, a vertical guide frame, a sliding table, a transverse guide groove, a sliding block and a vertical guide frame, wherein the vertical guide frame is at least provided with one group, the vertical guide groove is formed in the vertical guide frame and is in sliding connection with the sliding table, a sliding groove matched with the transverse guide groove is formed in the sliding table, and the sliding block in the sliding groove is fixedly connected with the measuring; one side of the sliding table facing the back plate is connected with a recording pen structure, the recording paper is arranged on the back plate through a roll paper limiting support, and the recording pen structure is in contact with the recording paper; the measuring scale is vertically arranged and penetrates through the transverse guide groove of the transverse guide frame, a handle is arranged on the measuring scale, and a movable pointer is installed at the lower end of the measuring scale; the extensible bottom plate of removal pointer and by the contact of survey work piece, along with by survey work piece structural feature up-and-down motion, the slip table that links firmly with the dipperstick along horizontal and/or vertical movement, drives the record pen structure synchronous motion on the recording paper, realizes being surveyed the record of work piece structural dimension and structural feature.
According to the scheme, the recording pen structure comprises a recording pen support, a spring and a recording pen, wherein the recording pen support is fixed on the back of the sliding table through a sliding table bolt and a sliding table nut, a mounting groove for mounting the spring is formed in the recording pen support, one end of the spring is fixed in the mounting groove, the other end of the spring is fixedly connected with the recording pen arranged at the front end of the mounting groove, and the recording pen can be contacted with recording paper under the action of the spring; and an operating button for limiting the position of the spring is arranged outside the mounting groove.
According to the scheme, the tool further comprises a recording paper support and a recording paper roll, wherein the recording paper support is fixed on the back plate, and the recording paper roll is rotationally connected with the recording paper support; and the recording paper is rolled into a cylinder shape and then sleeved on the recording paper reel.
According to the scheme, the tool is additionally provided with a left side plate and a right side plate; the instrument still is equipped with the stop gear who is used for restricting the dipperstick removal, stop gear includes two gag lever post supports and gag lever post, and two gag lever post supports divide to be established on the both sides of controlling two curb plates or window, and the gag lever post can insert the slip table, and both ends are set up on two gag lever post supports.
According to the scheme, the top of the measuring scale, which is positioned at the top of the mounting frame, is fixedly connected with a movable scale; an auxiliary flat plate is additionally arranged on the top plate, an auxiliary sliding groove consistent with the direction of the transverse guide groove is formed in the auxiliary flat plate, an auxiliary sliding block is installed in the auxiliary sliding groove, and the auxiliary sliding block is connected with the movable ruler through an auxiliary bolt.
According to the scheme, the four corners of the bottom plate are respectively provided with one magnetic block, and the magnetic blocks and the workpiece to be tested are mutually adsorbed.
According to the scheme, the mounting base further comprises a front panel, a window used for observing movement of the measuring ruler and facilitating operation of the handle is formed in the front panel, and the handle extends out through the window.
According to the scheme, a group of transverse guide frames are respectively arranged at the bottom plate and the top plate, and transverse guide grooves for moving the measuring scale are respectively and correspondingly formed at the top plate and the bottom plate; two ends of the transverse guide frame are respectively lapped with the L-shaped end support and are fastened through a third bolt, and two outer right-angle sides of the L-shaped end support are respectively connected with the left side plate/right side plate and the bottom plate of the mounting seat; and the corner brackets and the transverse guide frame are connected with the front panel or the back panel.
According to the scheme, the vertical sliding block is installed in the vertical guide groove and connected with the sliding table.
The invention has the beneficial effects that: the invention designs a rapid measuring and recording tool suitable for the structural characteristics of the sheet metal of an automobile body according to the basic principle of accurate measurement, wherein a recording pen and a moving pointer are linked on different parallel planes, the recording pen can reproduce the sectional characteristics of the measured sheet metal structure on recording roll paper in equal size, and the structural characteristics of the sheet metal structure of the automobile body or other measured workpieces are measured and the sectional shape is described, aiming at solving the problem that the existing measuring and recording method cannot realize low-cost, accurate and perfect measurement and recording of the structural characteristics of the sheet metal of the automobile body.
Drawings
Fig. 1 is a schematic overall structure diagram of an embodiment of the present invention.
Fig. 2 is a schematic structural view of the front panel of the present embodiment after being removed.
Fig. 3 is a side view of fig. 1.
Fig. 4 is a schematic view of the connection between the measuring ruler and the transverse and longitudinal guiding frames in this embodiment.
Fig. 5 is a schematic view showing the connection of the measuring tape, the slide table, and the recording paper holder in this embodiment.
Fig. 6 is a schematic view showing the connection between the recording paper and the structure of the recording pen in this embodiment.
Fig. 7 is a schematic diagram illustrating the movement of the measuring ruler in this embodiment.
Fig. 8 is a schematic view showing the structure of the recording pen, recording paper and measuring tape in this embodiment.
Fig. 9 is a schematic diagram of the operation of the present embodiment.
Wherein: 1. a front panel; 2. a top plate; 3. a base plate; 4. a back plate; 5. a side plate; 6. a magnetic block; 7. a limiting bracket; 8. a limiting rod; 9. a first bolt; 10. an auxiliary plate; 11. a roll paper limiting bracket; 12. a vertical guide frame; 13. a transverse guide frame; 14. a sliding table; 15. measuring a scale; 16. moving a pointer; 17. a handle; 18. a slipway nut; 19. a slipway bolt; 20. an auxiliary bolt; 21. moving the ruler; 22. recording paper; 23. a second bolt; 24. a second nut; 25. a corner bracket; 26. an end bracket; 27. a third bolt; 28. an auxiliary slide block; 29. a vertical slide block; 30. a cylindrical connecting block; 31. a recording paper roll; 32. a recording paper support; 33. a stylus holder; 34. a spring; 35. an operation button; 36. a stylus.
Detailed Description
For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
As shown in fig. 1 to 3, the tool for quickly measuring and recording the structural characteristics of the sheet metal of the automobile body comprises a mounting seat, a measuring scale 15, a transverse guide frame 13, a vertical guide frame 12, a sliding table 14, a recording pen structure and recording paper 22, wherein the transverse guide frame 13, the vertical guide frame 12, the sliding table 14, the recording pen structure and the recording paper 22 are arranged in the mounting seat, the mounting seat comprises a top plate 2, a bottom plate 3 and a back plate 4, at least one group of the transverse guide frames 13 is arranged and mounted on the top plate 2 and/or the bottom plate 3, and transverse guide grooves which are used for penetrating through the measuring scale 15 and can be used for the transverse movement of the measuring; the vertical guide frames 12 are at least provided with one group, the vertical guide frames 12 are provided with vertical guide grooves, the vertical guide grooves are connected with the sliding table 14 in a sliding mode, the sliding table 14 is provided with sliding grooves matched with the transverse guide grooves, and sliding blocks in the sliding grooves are fixedly connected with the measuring scale 15; one side of the sliding table 14 facing the back plate 4 is connected with a recording pen structure, the recording paper 22 is arranged on the back plate 4 through a roll paper limiting support, and the recording pen structure is in contact with the recording paper 22; the measuring scale 15 is vertically arranged and penetrates through a transverse guide groove of the transverse guide frame 13, a handle 17 is arranged on the measuring scale 15, and a movable pointer 16 is arranged at the lower end of the measuring scale 15; the movable pointer 16 can extend out of the bottom plate 3 to be in contact with a workpiece to be measured, and along with the up-and-down movement of structural characteristics of the workpiece to be measured, the sliding table 14 fixedly connected with the measuring scale 15 moves along with the measuring scale 15 in the transverse direction and/or the vertical direction to drive the recording pen structure to synchronously move on the recording paper 22, so that the recording of the structural size and the structural characteristics of the workpiece to be measured is realized.
In the invention, four corners of the bottom plate 3 are respectively provided with a magnetic block 6 (as shown in fig. 3), the tool is placed on a workpiece to be measured during measurement, the magnetic blocks 6 and the workpiece to be measured are mutually adsorbed, the workpiece to be measured is assisted to fix a measurement position, and relative sliding in the measurement and recording processes is avoided. The mount pad is still including positive panel 1, offers the window that is used for observing the motion of dipperstick 15 and is convenient for handle 17 operation on the positive panel 1, and handle 17 stretches out through the window to at the measuring in-process, operating personnel removes handle 17, and handle 17 drives and removes about the dipperstick 15. A group of transverse guide frames 13 are respectively arranged at the bottom plate 3 and the top plate 2, and transverse guide grooves for moving the measuring scale 15 are respectively correspondingly formed at the top plate 2 and the bottom plate 3. The transverse guide frame 13 on the bottom plate 3 and the transverse guide frame 13 on the top plate 2 are mounted in the same manner, and the transverse guide frame 13 on the bottom plate 3 will be described as an example. Two ends of the transverse guide frame 13 are respectively lapped with an L-shaped end support 26 and are fastened through a third bolt 27, and two outer right-angle sides of the L-shaped end support 26 are respectively connected with the left side plate 5/right side plate 5 and the bottom plate 3 of the mounting seat; four corners of the transverse guide frame 13 are respectively provided with a corner bracket 25, and the corner bracket 25, the transverse guide frame 13 and the front panel 1 (or the back panel 4) are connected through a first bolt 9.
In the invention, the transverse guide frame 13 is provided with a mounting notch, and the upper end and the lower end of the vertical guide frame 12 are respectively mounted on the mounting notches of the two transverse guide frames 13; a vertical sliding block 29 which can slide along the vertical sliding table 14 is arranged in the vertical sliding groove, and the vertical sliding block 29 is fixedly connected with the sliding table 14, as shown in fig. 4.
In the invention, a vertical sliding block 29 is installed in the vertical guide groove, and the vertical sliding block 29 is connected with the sliding table 14 through a second bolt 2323 and a second nut 2424. The measuring scale 15 is connected with the slide block in the sliding groove through two sets of high-precision sliding table bolts 19 and sliding table nuts 18, so that the measuring scale 15 can move along with the sliding table 14 in the vertical direction and can also move transversely along the sliding groove in the sliding table 14. The two sets of high-precision sliding table bolts 19 and sliding table nuts 18 jointly act with the vertical sliding block 29, so that the movable pointer 16 can move left and right along with the characteristic of the measured curved surface, and meanwhile, the measurement error caused by the inclination of the measuring scale 15 can be avoided. A cylindrical connecting block 30 for adjusting the distance between the measuring scale 15 and the sliding table 14 is additionally arranged between the two.
Preferably, as shown in fig. 5 and 6, the recording pen structure includes a recording pen support 33, a spring 34 and a recording pen 36, the recording pen support 33 is fixed at the back of the sliding table 14 through a sliding table bolt 19 and a sliding table nut 18, an installation groove for installing the spring 34 is formed in the recording pen support 33, one end of the spring 34 is fixed in the installation groove, the other end of the spring 34 is fixedly connected with the recording pen 36 arranged at the front end of the installation groove, and the recording pen 36 can contact with the recording paper 22 under the action of the spring 34; an operating button 35 for limiting the position of the spring 34 is arranged outside the mounting groove, after recording is completed, the recording pen 36 is pulled back towards the sliding table 14, the spring 34 compresses and presses the operating button 35, at the moment, the pen point of the recording pen 36 is separated from the recording paper 22, and the recording paper 22 can be detached from the back plate 4.
Preferably, as shown in fig. 5 and 6, the tool further includes a recording paper holder 32 and a recording paper roll 31, the recording paper holder 32 is fixed on the back plate 4, and the recording paper roll 31 is rotatably connected to the recording paper holder 32; the recording paper 22 is wound into a roll shape and then fitted over the recording paper spool 31. In this embodiment, the recording paper holder 32 is welded to the back plate 4; the recording paper spool 31 is connected to the recording paper holder 32 by a screw connection; the recording paper 22 is sleeved on the recording paper reel 31, and the end part is fixed on the back plate 4 through the recording paper limiting bracket 11 after being pulled out.
Preferably, as shown in fig. 1 and 3, the tool is further added with a left side plate 5 and a right side plate 5; the instrument still is equipped with the stop gear who is used for restricting the removal of dipperstick 15, stop gear includes two gag lever post supports 7 and gag lever post 8, and two gag lever post supports 7 divide to be established on the both sides of controlling two curb plates 5 or windows, and the gag lever post 8 can insert slip table 14, and both ends are taken and are established on two gag lever post supports 7 to the mode of pull assembles with gag lever post support 7. After the measurement is accomplished, use handle 17 to lift dipperstick 15 (make the high and the high adaptation of gag lever post 8 of slip table 14), pass slip table 14 with gag lever post 8 again, establish on two gag lever post supports 7, move down through slip table 14 restriction dipperstick 15, avoid removing pointer 16 accidental injury survey crew.
Preferably, the measuring scale 15 is fixedly connected with a movable scale 21 at the top of the mounting frame; an auxiliary flat plate 10 is additionally arranged on the top plate 2, an auxiliary sliding groove with the direction consistent with that of the transverse guide groove is formed in the auxiliary flat plate 10, an auxiliary sliding block 28 is installed in the auxiliary sliding groove, and the auxiliary sliding block 28 is connected with the movable ruler 21 through an auxiliary bolt 20.
In order to realize the recording function of the curved surface characteristics, the tool comprises a recording pen structure and recording paper 22, and the recording paper 22 can select common white paper or ruled paper with scales according to requirements to record the cross-sectional characteristics of the measured workpiece in detail. Before measurement, the movable pointer 16 and the measuring scale 15 can be moved to appropriate positions, then the operating button 35 is moved backwards, the spring 34 drives the recording pen 36 to move backwards, a gap is reserved between the recording pen 36 and the recording paper 22, and the recording paper 22 is pulled outwards, so that measurement and recording work can be carried out.
During measurement, the tool is placed on a workpiece to be measured and is fixedly adsorbed with the workpiece to be measured through the magnetic block 6 arranged at the bottom. Other structural features such as ribs, beams, pipes, and variable cross-section surfaces can be measured and recorded in the above-described manner. An operator moves the handle 17 to drive the measuring scale 15 to move up, down, left and right along with the shape of the workpiece to be measured, and the recording pen 36 is linked to move on the recording paper 22, so that the cross-sectional characteristics of the workpiece to be measured can be accurately reproduced, as shown in fig. 7-9.
The invention combines the accurate measurement theory and the mechanical structure movement, and realizes the measurement and the recording of the structural characteristics of the sheet metal of the automobile body in a low-cost mode. Through the structure, the information of the sizes of key structure sections such as the inducing and guiding groove and the reinforcing rib of the sheet metal structure and the section shape information can be visually provided for the structural design of the vehicle model, and a database is formed through accumulation, so that abundant basic parameters are provided for the development of the vehicle model and the platform in the future. In addition, the invention can also measure and record other structures (such as pipe fittings, beams with different structures, irregular variable cross-section structures and the like), and has the characteristics of convenient operation, low cost, good adaptability and the like. According to the structure space and the size of the metal plate structure, a small-size measuring tool suitable for the induction groove, the reinforcing rib and the smaller longitudinal and transverse reinforcing beams can be manufactured, and the small-size measuring tool is suitable for large-size longitudinal beams, seat cross beams and other large-size metal plate cross sections. When the adaptive processing and the modification are carried out, the structural form and the movement mechanism do not need to be redesigned. Therefore, the method has good universality in structural principle.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the embodiments, it will be apparent to those skilled in the art that modifications can be made to the technical solutions described in the above-mentioned embodiments, or equivalent substitutions of some technical features, but any modifications, equivalents, improvements and the like within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims (9)
1. A quick measuring and recording tool for the structural characteristics of a metal plate of an automobile body is characterized by comprising a mounting seat, a measuring scale, a transverse guide frame, a vertical guide frame, a sliding table, a recording pen structure and recording paper, wherein the transverse guide frame, the vertical guide frame, the sliding table, the recording pen structure and the recording paper are arranged in the mounting seat; the device comprises a measuring scale, a vertical guide frame, a sliding table, a transverse guide groove, a sliding block and a vertical guide frame, wherein the vertical guide frame is at least provided with one group, the vertical guide groove is formed in the vertical guide frame and is in sliding connection with the sliding table, a sliding groove matched with the transverse guide groove is formed in the sliding table, and the sliding block in the sliding groove is fixedly connected with the measuring; one side of the sliding table facing the back plate is connected with a recording pen structure, the recording paper is arranged on the back plate through a roll paper limiting support, and the recording pen structure is in contact with the recording paper; the measuring scale is vertically arranged and penetrates through the transverse guide groove of the transverse guide frame, a handle is arranged on the measuring scale, and a movable pointer is installed at the lower end of the measuring scale; the extensible bottom plate of removal pointer and by the contact of survey work piece, along with by survey work piece structural feature up-and-down motion, the slip table that links firmly with the dipperstick along horizontal and/or vertical movement, drives the record pen structure synchronous motion on the recording paper, realizes being surveyed the record of work piece structural dimension and structural feature.
2. The tool for rapidly measuring and recording the structural characteristics of the sheet metal of the automobile body according to claim 1, wherein the recording pen structure comprises a recording pen support, a spring and a recording pen, the recording pen support is fixed on the back of the sliding table through a sliding table bolt and a sliding table nut, an installation groove for installing the spring is formed in the recording pen support, one end of the spring is fixed in the installation groove, the other end of the spring is fixedly connected with the recording pen arranged at the front end of the installation groove, and the recording pen can be contacted with recording paper under the action of the spring; and an operating button for limiting the position of the spring is arranged outside the mounting groove.
3. The tool for rapidly measuring and recording the structural characteristics of the sheet metal of the automobile body according to claim 1, further comprising a recording paper support and a recording paper roll, wherein the recording paper support is fixed on the back plate, and the recording paper roll is rotatably connected with the recording paper support; and the recording paper is rolled into a cylinder shape and then sleeved on the recording paper reel.
4. The tool for rapidly measuring and recording the sheet metal structural characteristics of the automobile body according to claim 1, wherein a left side plate and a right side plate are additionally arranged on the tool; the instrument still is equipped with the stop gear who is used for restricting the dipperstick removal, stop gear includes two gag lever post supports and gag lever post, and two gag lever post supports divide to be established on the both sides of controlling two curb plates or window, and the gag lever post can insert the slip table, and both ends are set up on two gag lever post supports.
5. The tool for rapidly measuring and recording the sheet metal structural characteristics of the automobile body according to claim 1, wherein the measuring scale is fixedly connected with a moving scale at the top of the mounting frame; an auxiliary flat plate is additionally arranged on the top plate, an auxiliary sliding groove consistent with the direction of the transverse guide groove is formed in the auxiliary flat plate, an auxiliary sliding block is installed in the auxiliary sliding groove, and the auxiliary sliding block is connected with the movable ruler through an auxiliary bolt.
6. The tool for rapidly measuring and recording the sheet metal structural characteristics of the automobile body according to claim 1, wherein the four corners of the bottom plate are respectively provided with a magnetic block, and the magnetic blocks are mutually adsorbed with a workpiece to be measured.
7. The tool for rapidly measuring and recording the structural characteristics of the sheet metal of the automobile body according to claim 1, wherein the mounting seat further comprises a front panel, a window for observing the movement of the measuring scale and facilitating the operation of a handle is formed in the front panel, and the handle extends out through the window.
8. The tool for rapidly measuring and recording the sheet metal structure characteristics of the automobile body according to claim 1, wherein a group of transverse guide frames are respectively arranged at the bottom plate and the top plate, and transverse guide grooves for moving the measuring scale are respectively and correspondingly formed at the top plate and the bottom plate; two ends of the transverse guide frame are respectively lapped with the L-shaped end support and are fastened through a third bolt, and two outer right-angle sides of the L-shaped end support are respectively connected with the left side plate/right side plate and the bottom plate of the mounting seat; and the corner brackets and the transverse guide frame are connected with the front panel or the back panel.
9. The tool for rapidly measuring and recording the structural characteristics of the sheet metal of the automobile body according to claim 1, wherein a vertical sliding block is installed in the vertical guide groove and connected with the sliding table.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010892507.8A CN111981936B (en) | 2020-08-31 | 2020-08-31 | Quick measurement record instrument of car body sheet metal structure characteristic |
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| CN202010892507.8A CN111981936B (en) | 2020-08-31 | 2020-08-31 | Quick measurement record instrument of car body sheet metal structure characteristic |
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| CN111981936B CN111981936B (en) | 2021-09-07 |
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| CN111981936B (en) | 2021-09-07 |
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