Non-contact laser projection ruler and use method thereof

Abstract

The invention discloses a non-contact laser projection ruler and a use method thereof. The non-contact laser projection ruler comprises a cross-shaped physical frame, a projection ruler part, a positioning part I and a positioning part II, the ruler casting part is arranged at the front end of the physical frame; the positioning part I and the positioning part II are respectively arranged on two sides of the physical frame; a measuring scale laser diffraction grating is movably arranged on the scale casting part; the scale laser diffraction grating can project a scale type laser projection pattern on a measured object; the positioning part I and the positioning part II are respectively provided with a group of positioning laser diffraction gratings which can respectively project a linear laser projection pattern I and a linear laser projection pattern II on a measured object; when the distance between the positioning laser diffraction grating and the measured object and the distance between the measuring scale laser diffraction grating and the measured object are consistent with the projection focal length, the line of a projected pattern is the finest, and the size of the pattern is consistent with a preset value. According to the invention, non-contact size measurement can be carried out on the detected material by adopting projection, pollution to the detected material is avoided, and the device is simple in structure, visual in display and convenient to use.

Description

Technical Field

[0001] The invention belongs to the technical field of optical measurement, and in particular relates to a contactless laser projection ruler and a method for using the same. Background Art

[0002] In many fields such as modern clinical medicine, forensic medicine, and criminal technology science, it is necessary to measure and record the size of wounds, evidence, and other test materials to ensure the correctness and legality of the inspection and detection, and to facilitate subsequent work. The traditional method of measuring the size of test materials is contact measurement, that is, measuring tools such as markers and scales are brought close to or in contact with the test materials to obtain the size of the test materials. The test materials record relevant information about the parties, criminals, and other personnel, as well as the injuries of the personnel. The use of traditional contact measurement methods will contaminate the test materials, which is not conducive to the preservation of evidence and will also cause infection to the wounds. In order not to touch the test materials, the measurement tools are deliberately brought close to the test materials but not in contact with them, which makes the measurement data inaccurate and will accidentally touch the test materials, bringing certain risks of contamination. Summary of the invention

[0003] The purpose of the present invention is to provide a non-contact laser projection ruler and its use method to solve the problems that the existing technology easily touches the sample when measuring the size of the sample, causing pollution, etc. The present invention adopts projection to measure the size of the sample without contact, and will not cause pollution to the sample such as evidence and wounds. It has a simple structure, intuitive display, convenient and flexible use, and can be quickly used without special skills.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A non-contact laser projection ruler, comprising a cross-shaped physical frame, a projection ruler part, a positioning part I and a positioning part II; the projection ruler part is arranged at the front end of the physical frame; the positioning part I and the positioning part II are respectively arranged on both sides of the physical frame; the connecting line between the projection ruler part, the positioning part I and the positioning part II forms an isosceles triangle; a scale laser diffraction grating is movably arranged on the projection ruler part; the scale laser diffraction grating can project a scale-shaped laser projection pattern with scales on the measured object; a group of positioning laser diffraction gratings are respectively arranged on the positioning part I and the positioning part II; the two groups of positioning laser diffraction gratings are arranged on the projection ruler part; the scale laser diffraction gratings are ... The positioning laser diffraction grating can project an inclined straight line laser projection pattern I and a straight line laser projection pattern II on the object to be measured respectively; the laser light source built-in lens projection focal length of the positioning laser diffraction grating and the scale laser diffraction grating is the same; when the distance between the positioning laser diffraction grating and the scale laser diffraction grating and the object to be measured is consistent with the projection focal length, the lines of the projected pattern are the thinnest, and the pattern size is consistent with the preset value. At this time, one end of the straight line laser patterns projected by the two sets of positioning laser diffraction gratings just intersect, and the intersection is located on the scale laser diffraction grating projected by the scale laser diffraction grating.

[0006] The physical frame serves as the mounting support part of the projection part, the positioning part I and the positioning part II; the laser diffraction grating on the projection part projects a scaled ruler-shaped laser projection pattern on the object to be measured, and when the projection part is adjusted to a suitable position, the ruler-shaped laser projection pattern is the same as the actual length, and can be used as a ruler to measure the size of the object to be measured; the linear laser projection pattern I and one end of the linear laser projection pattern II projected by the positioning laser diffraction gratings on the positioning part I and the positioning part II on the object to be measured just intersect, and when the intersection is located on the ruler-shaped laser projection pattern, it means that the distance between the positioning laser diffraction grating and the shell projection is just right at this time, because the laser light source projection focal lengths of the positioning laser diffraction grating and the scale laser diffraction grating are the same, the distance between the scale laser diffraction grating and the object to be measured is appropriate, and the scale on the projected ruler-shaped laser projection pattern is the same as the actual length; the preset value is the actual scale length; the device can also be used in machining to meet measurement requirements such as workpiece measurement.

[0007] As a further technical improvement, a vertical rotating mounting shaft is provided in the projection part, positioning part I and positioning part II; the positioning laser diffraction grating and the scale laser diffraction grating both include a shell, a horizontal rotating mounting shaft and a light source head; the shell is arranged on the vertical rotating mounting shaft; the light source head is arranged on the shell through the horizontal rotating mounting shaft. The vertical rotating mounting shaft can drive the shell to rotate in the vertical direction, and the horizontal rotating mounting shaft can drive the light source head to rotate in the horizontal direction, and the projection calibration and debugging of the light source head are carried out together; scales are provided on the vertical rotating mounting shaft and the horizontal rotating mounting shaft for observing the rotation angle, so that the rotation angle of the light source head can be adjusted to be consistent when the light source head is adjusted; fixed pins are provided on the vertical rotating mounting shaft and the horizontal rotating mounting shaft, and after adjusting the rotation angle, the fixed pins can be inserted to fix the angle position so that the corresponding parts will not rotate; when performing calibration and debugging, a real ruler can be placed on the desktop and the corresponding parts can be rotated to adjust the position of the physical frame until the ruler-shaped laser projection pattern is consistent with the scale value on the ruler, and the intersection position of one end of the linear laser projection pattern I and the linear laser projection pattern II is on the ruler-shaped laser projection pattern.

[0008] As a further technical improvement, it also includes a movable adjustment bracket; the movable adjustment bracket includes a transverse axis bracket, a front and rear bracket, a longitudinal axis bracket and a mounting bracket; two groups of the transverse axis brackets are arranged in parallel; the front and rear brackets are movably connected between the two groups of transverse axis brackets; the longitudinal axis bracket is movably arranged on the front and rear brackets; the mounting bracket is movably arranged on the longitudinal axis bracket; the physical frame is detachably connected to the mounting bracket. The movable bracket is used to adjust the position of the physical frame, thereby adjusting the position of the projection part, positioning part I and positioning part II; the movable adjustment bracket can be manually adjusted, or it can be connected to a power device for electric adjustment, such as adding a motor and a roller so that the corresponding bracket moves in the corresponding track; the transverse axis bracket is used to adjust the lateral movement of the physical frame; the front and rear brackets are used to adjust the front and rear movement of the physical frame; the longitudinal axis bracket is used to adjust the vertical movement of the physical frame; the mounting bracket is used to install the physical frame.

[0009] As a further technical improvement, the transverse axis bracket is provided with a transverse track; the two ends of the front and rear brackets can be movably connected to the transverse track; the front and rear brackets are provided with front and rear tracks; the lower part of the longitudinal axis bracket can be movably connected to the front and rear tracks; the longitudinal axis bracket is provided with a longitudinal track; the mounting bracket can be movably connected to the longitudinal track. The front and rear brackets can move along the transverse track; the longitudinal axis bracket can move along the front and rear tracks; and the mounting bracket can move along the longitudinal track.

[0010] As a further technical improvement, a mounting seat is provided at the front end of the mounting bracket; a mounting slot matching the rear end of the physical frame is provided on the mounting seat, and the physical frame is detachably mounted in the mounting slot.

[0011] As a further technical improvement, the physical frame is connected with a power supply and a switch. The power supply can be integrated into the physical frame or externally connected through wires; the power supply is connected to the scale laser diffraction grating and the positioning laser diffraction grating for power supply; the switch is used to control the start and stop of the scale laser diffraction grating and the positioning laser diffraction grating.

[0012] The usage of the non-contact laser projection ruler described above:

[0013] Projection: Move the physical frame to the top of the object to be measured, start the device, and the scale laser diffraction grating projects a scaled ruler-shaped laser projection pattern on the object to be measured. The two sets of positioning laser diffraction gratings project inclined linear laser projection pattern I and linear laser projection pattern II on the object to be measured respectively.

[0014] Distance adjustment: By moving the physical frame, find a suitable projection position that can adjust the ruler-type laser projection pattern to the same length as the actual length; when the physical frame is close to the object to be measured, the distance between the positioning laser diffraction grating and the object to be measured is less than the suitable projection position, then the linear laser projection pattern I and the linear laser projection pattern II do not intersect in front of the object to be measured; when the physical frame is far away from the object to be measured, the distance between the positioning laser diffraction grating and the object to be measured is greater than the suitable projection position, then the linear laser projection pattern I and the linear laser projection pattern II intersect in front of the object to be measured, and the focus is located in front of the ruler-type laser projection pattern; when adjusted to the appropriate projection position, one end of the linear laser projection pattern I and the linear laser projection pattern II intersect, and the intersection is located on the ruler-type laser projection pattern; at this time, the scale of the ruler-type laser projection pattern is the same as the actual length scale, and the actual length of the object to be measured can be read.

[0015] As a further technical improvement, the focal length of the scale laser diffraction grating is equal to that of the positioning laser diffraction grating. Therefore, when the straight laser projection pattern II projected by the positioning laser diffraction grating is in a suitable projection position, the scale laser diffraction grating is also in a suitable projection position, that is, the scale of the scale laser projection pattern is the same as the actual length scale.

[0016] Draw a sphere I with the focal length of the two sets of positioning laser diffraction gratings as the radius, and the projection image on the spherical surface is the clearest; at this time, the intersection of the two spheres I forms an intersecting circle; draw a sphere II with the focal length of the scale laser diffraction grating as the radius, and the ruler-type laser projection pattern projected by the scale laser diffraction grating on the surface of this sphere II is the clearest; sphere II intersects with the intersecting circle at two upper and lower intersection points, and the intersection points are the points where the ruler-type laser projection pattern, the linear laser projection pattern I and the linear laser projection pattern II are all the clearest. Since the object to be measured is located below this device, the lower intersection point is selected. When the lower intersection point is located on the object to be measured, the scale on the ruler-type laser projection pattern is consistent with the real scale; when the intersection point is located on the object to be measured, one end of the linear laser projection pattern I and the linear laser projection pattern II intersect, and the intersection point is located on the ruler-type laser projection pattern. Therefore, just move the physical frame and find the point as shown in the attached manual. Figure 5 The image status shown is OK.

[0017] The technical solution of the present invention has the following beneficial effects:

[0018] 1. The present invention can project a ruler-shaped laser projection pattern on the object to be measured through a scale laser diffraction grating, which is used to measure the size of the object to be measured without touching the object to be measured, thereby avoiding the problem of contaminating the object to be measured. The present invention is suitable for measuring the size of various medical and criminal investigation materials.

[0019] 2. The present invention uses two sets of positioning laser diffraction gratings to project a linear laser projection pattern I and a linear laser projection pattern II onto the object to be measured. The current position of the physical frame is adjusted by the intersection of the two sets of linear laser projection patterns, so that the scale of the ruler-shaped laser projection pattern is the same as the actual scale, thereby enabling the ruler-shaped laser projection pattern to be used for dimension measurement.

[0020] 3. The ruler projection part, positioning part I and positioning part II of the present invention can all be rotated for calibration, ensuring that the ruler-shaped laser projection pattern can truly reflect the size of the object when the device is used.

[0021] 4. The movable adjustment bracket of the present invention can adjust the position of the physical frame, thereby adjusting the distance between the positioning laser diffraction grating and the scale laser diffraction grating and the object to be measured, so that the scale laser projection pattern can more accurately reflect the size of the object to be measured.

[0022] 5. The device of the present invention has a simple structure, is convenient and flexible to use, displays the measured values ​​intuitively, has a low threshold for use, and is low in cost, and is suitable for wide use in the field of sample measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the device of the present invention.

[0024] Figure 2 Schematic diagram of the disassembly of the device of the present invention.

[0025] Figure 3 It is a schematic diagram of the movable adjustment bracket of the device of the present invention.

[0026] Figure 4 Schematic diagram of the projection pattern of the positioning laser diffraction grating and the scale laser diffraction grating when the physical frame is too far away from the object to be measured.

[0027] Figure 5 Schematic diagram of the projection pattern of the positioning laser diffraction grating and the scale laser diffraction grating when the physical frame is at an appropriate distance from the object to be measured.

[0028] Figure 6 Schematic diagram of the projection pattern of the positioning laser diffraction grating and the scale laser diffraction grating when the physical frame is too close to the object being measured.

[0029] Figure 7 This is a schematic diagram of the intersecting circles formed by two spheres when a sphere is drawn with the focal length of two sets of positioning laser diffraction gratings as the radius.

[0030] Figure 8 It is a schematic diagram of the intersection of three spheres, a sphere drawn with the focal length of the scale laser diffraction grating as the radius and a sphere drawn with the focal length of two sets of positioning laser diffraction gratings as the radius.

[0031] Figure markings: 1-physical frame, 2-projection part, 3-positioning part I, 4-positioning part II, 5-vertical rotation mounting axis, 6-housing, 7-positioning laser diffraction grating, 8-horizontal rotation mounting axis, 9-scale laser diffraction grating, 10-ruler-type laser projection pattern, 11-linear laser projection pattern I, 12-linear laser projection pattern II, 13-measured object, 14-horizontal axis bracket, 15-horizontal rail, 16-front and rear brackets, 17-front and rear rails, 18-longitudinal axis bracket, 19-longitudinal rail, 20-mounting bracket, 21-mounting seat, 22-mounting groove. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings.

[0033] Embodiment 1:

[0034] like Figures 1 to 6 As shown, a non-contact laser projection ruler comprises a cross-shaped physical frame 1, a projection ruler part 2, a positioning part I3 and a positioning part II4; the projection ruler part 2 is arranged at the front end of the physical frame 1; the positioning part I3 and the positioning part II4 are respectively arranged on both sides of the physical frame 1; the connecting line between the projection ruler part 2, the positioning part I3 and the positioning part II4 forms an isosceles triangle; a scale laser diffraction grating 9 is movably arranged on the projection ruler part 2; the scale laser diffraction grating 9 can project a scale-shaped laser projection pattern 10 with scale on the measured object 13; a group of positioning laser diffraction gratings 7 are respectively arranged on the positioning part I3 and the positioning part II4; The two groups of positioning laser diffraction gratings 7 can respectively project an inclined linear laser projection pattern I11 and a linear laser projection pattern II12 on the object to be measured 13; the laser light source built-in lens projection focal length of the positioning laser diffraction grating 7 and the scale laser diffraction grating 9 is the same; when the distance between the positioning laser diffraction grating 7 and the scale laser diffraction grating 9 and the object to be measured 13 is consistent with the projection focal length, the lines of the projected pattern are the thinnest, and the pattern size is consistent with the preset value. At this time, one end of the linear laser patterns projected by the two groups of positioning laser diffraction gratings 7 just intersect, and the intersection is located on the scale laser diffraction grating 9 projected by the scale laser diffraction grating 9.

[0035] A vertical rotating mounting shaft 5 is provided in the projection part 2, the positioning part I3 and the positioning part II4; the positioning laser diffraction grating 7 and the scale laser diffraction grating 9 both include a shell 6, a horizontal rotating mounting shaft 8 and a light source head; the shell 6 is arranged on the vertical rotating mounting shaft 5; the light source head is arranged on the shell 6 through the horizontal rotating mounting shaft 8.

[0036] It also includes a movable adjustment bracket; the movable adjustment bracket includes a transverse axis bracket 14, a front and rear bracket 16, a longitudinal axis bracket 18 and a mounting bracket 20; two groups of transverse axis brackets 14 are arranged in parallel; the front and rear brackets 16 are movably connected between the two groups of transverse axis brackets 14; the longitudinal axis bracket 18 is movably arranged on the front and rear brackets 16; the mounting bracket 20 is movably arranged on the longitudinal axis bracket 18; the physical frame 1 is detachably connected to the mounting bracket 20.

[0037] The transverse axis bracket 14 is provided with a transverse track 15; the two ends of the front and rear brackets 16 are movably connected to the transverse track 15; the front and rear brackets 16 are provided with front and rear tracks 17; the lower part of the longitudinal axis bracket 18 is movably connected to the front and rear tracks 17; the longitudinal axis bracket 18 is provided with a longitudinal track 19; the mounting bracket 20 is movably connected to the longitudinal track 19.

[0038] The method of use of the present invention is as follows:

[0039] Projection: Move the physical frame 1 to the top of the object 13 to be measured, start the device, and the scale laser diffraction grating 9 projects a scaled ruler-shaped laser projection pattern 10 on the object 13 to be measured, and the two sets of positioning laser diffraction gratings 7 project inclined linear laser projection patterns Ⅰ11 and linear laser projection patterns Ⅱ12 on the object 13 to be measured respectively;

[0040] Distance adjustment: by moving the physical frame 1, find a suitable projection position that can adjust the ruler-type laser projection pattern 10 to the same length as the actual length; when the physical frame 1 is close to the object 13 to be measured, the distance between the positioning laser diffraction grating 7 and the object 13 to be measured is less than the suitable projection position, then the linear laser projection pattern I11 and the linear laser projection pattern II12 do not intersect in front of the object 13 to be measured; when the physical frame 1 is far away from the object 13 to be measured, the distance between the positioning laser diffraction grating 7 and the object 13 to be measured is greater than the suitable projection position, then the linear laser projection pattern I11 and the linear laser projection pattern II12 intersect in front of the object 13 to be measured, and the focus is located in front of the ruler-type laser projection pattern 10; when adjusted to the suitable projection position, one end of the linear laser projection pattern I11 and the linear laser projection pattern II12 intersect, and the intersection is located on the ruler-type laser projection pattern 10; at this time, the scale of the ruler-type laser projection pattern 10 is the same as the actual length scale, and the actual length of the object 13 to be measured can be read. The focal length of the scale laser diffraction grating 9 is equal to that of the positioning laser diffraction grating 7. Therefore, when the linear laser projection pattern II12 projected by the positioning laser diffraction grating 7 is at a suitable projection position, the scale laser diffraction grating 9 is also at a suitable projection position, that is, the scale of the ruler laser projection pattern 10 is the same as the actual length scale.

[0041] Draw a sphere Ⅰ25 with the focal length of the two positioning laser diffraction gratings 7 as the radius, and the projection image on the sphere is the clearest; at this time, the intersection of the two spheres Ⅰ25 forms an intersection circle 23; draw a sphere Ⅱ26 with the focal length of the scale laser diffraction grating 9 as the radius, and the ruler-shaped laser projection pattern 10 projected by the scale laser diffraction grating 9 on the surface of this sphere Ⅱ26 is the clearest; the sphere Ⅱ26 intersects with the intersection circle 23 at the upper and lower intersection points 24, and the intersection points 24 are the ruler-shaped laser projection pattern 10, the linear laser projection pattern 10, and the linear laser projection pattern 10. The point where both the linear laser projection pattern Ⅰ11 and the linear laser projection pattern Ⅱ12 are the clearest. Since the object 13 to be measured is located below the device, the intersection point 24 below is selected. When the intersection point 24 below is located on the object 13 to be measured, the scale on the ruler-shaped laser projection pattern 10 is consistent with the real scale; when the intersection point 24 is located on the object 13 to be measured, one end of the linear laser projection pattern Ⅰ11 and the linear laser projection pattern Ⅱ12 intersect, and the intersection point is located on the ruler-shaped laser projection pattern 10. Therefore, as long as the physical frame is moved, the following can be found: Figure 5 The image status shown is OK.

[0042] Embodiment 2:

[0043] The difference between this embodiment and the first embodiment is that a mounting seat 21 is provided at the front end of the mounting bracket 20 ; and a mounting groove 22 matching the rear end of the physical frame 1 is provided on the mounting seat 21 .

[0044] The method of use of this embodiment is the same as that of the first embodiment.

[0045] Embodiment three:

[0046] The difference between this embodiment and the second embodiment is that the physical frame 1 is connected to a power supply and a switch.

[0047] The method of use of this embodiment is the same as that of the first embodiment.

[0048] Embodiment 4:

[0049] The difference between this embodiment and the third embodiment is that: a mounting seat 21 is provided at the front end of the mounting bracket 20; and a mounting slot 22 matching the rear end of the physical frame 1 is provided on the mounting seat 21. The physical frame 1 is connected to a power supply and a switch.

[0050] The method of use of this embodiment is the same as that of the first embodiment.

[0051] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

[0052] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "inside", "front", "back", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0053] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A non-contact laser projection ruler, characterized in that: The invention comprises a cross-shaped physical frame (1), a projection part (2), a positioning part I (3) and a positioning part II (4); the projection part (2) is arranged at the front end of the physical frame (1); the positioning part I (3) and the positioning part II (4) are arranged on both sides of the physical frame (1); the connecting line between the projection part (2), the positioning part I (3) and the positioning part II (4) forms an isosceles triangle; A scale laser diffraction grating (9) is movably provided on the projection part (2); the scale laser diffraction grating (9) can project a scale-shaped laser projection pattern (10) with scale on the object to be measured (13); The positioning part I (3) and the positioning part II (4) are respectively provided with a group of positioning laser diffraction gratings (7); the two groups of positioning laser diffraction gratings (7) can respectively project an inclined linear laser projection pattern I (11) and a linear laser projection pattern II (12) on the measured object (13); The laser light sources of the positioning laser diffraction grating (7) and the scale laser diffraction grating (9) have the same projection focal length of the built-in lenses; when the distances between the positioning laser diffraction grating (7) and the scale laser diffraction grating (9) and the measured object (13) are consistent with the projection focal length, the lines of the projected pattern are the thinnest, and the pattern size is consistent with a preset value. At this time, one end of the linear laser patterns projected by the two groups of positioning laser diffraction gratings (7) just intersect, and the intersection point is located on the scale laser diffraction grating (9) projected by the scale laser diffraction grating (9).

2. The non-contact laser projection ruler according to claim 1, characterized in that: A vertical rotation mounting shaft (5) is provided in the projection part (2), the positioning part I (3) and the positioning part II (4); the positioning laser diffraction grating (7) and the scale laser diffraction grating (9) each comprise a housing (6), a horizontal rotation mounting shaft (8) and a light source head; the housing (6) is arranged on the vertical rotation mounting shaft (5); and the light source head is arranged on the housing (6) via the horizontal rotation mounting shaft (8).

3. The non-contact laser projection ruler according to claim 1, characterized in that: It also includes a movable adjustment bracket; the movable adjustment bracket includes a transverse axis bracket (14), a front and rear bracket (16), a longitudinal axis bracket (18) and a mounting bracket (20); two groups of the transverse axis brackets (14) are arranged in parallel; the front and rear brackets (16) are movably connected between the two groups of transverse axis brackets (14); the longitudinal axis bracket (18) is movably arranged on the front and rear brackets (16); the mounting bracket (20) is movably arranged on the longitudinal axis bracket (18); and the physical frame (1) is detachably connected to the mounting bracket (20).

4. The non-contact laser projection ruler according to claim 3, characterized in that: The transverse axis bracket (14) is provided with a transverse track (15); both ends of the front and rear brackets (16) are movably connected to the transverse track (15); the front and rear brackets (16) are provided with front and rear tracks (17); the lower part of the longitudinal axis bracket (18) is movably connected to the front and rear tracks (17); the longitudinal axis bracket (18) is provided with a longitudinal track (19); and the mounting bracket (20) is movably connected to the longitudinal track (19).

5. The non-contact laser projection ruler according to claim 3, characterized in that: A mounting seat (21) is provided at the front end of the mounting bracket (20); a mounting groove (22) matching the rear end of the physical frame (1) is provided on the mounting seat (21).

6. The non-contact laser projection ruler according to claim 1, characterized in that: The physical frame (1) is connected to a power source and a switch.

7. The method for using the non-contact laser projection ruler according to any one of claims 1 to 6, characterized in that: The following steps are involved: 1) Projection: Move the physical frame (1) to the top of the object to be measured (13), start the device, and the scale laser diffraction grating (9) projects a scaled ruler-shaped laser projection pattern (10) on the object to be measured (13), and the two sets of positioning laser diffraction gratings (7) respectively project inclined linear laser projection patterns I (11) and linear laser projection patterns II (12) on the object to be measured (13); 2) Distance adjustment: by moving the physical frame (1), find a suitable projection position that can adjust the ruler-shaped laser projection pattern (10) to the same length as the actual length; when the physical frame (1) is close to the object to be measured (13), the distance between the positioning laser diffraction grating (7) and the object to be measured (13) is less than the suitable projection position, and the linear laser projection pattern I (11) and the linear laser projection pattern II (12) do not intersect in front of the object to be measured (13); when the physical frame (1) is far away from the object to be measured (13), the distance between the positioning laser diffraction grating (7) and the object to be measured (13) is less than the suitable projection position. When the distance between the two is greater than the appropriate projection position, the linear laser projection pattern I (11) and the linear laser projection pattern II (12) intersect in front of the object to be measured (13), and the focus is located in front of the ruler-shaped laser projection pattern (10); when adjusted to the appropriate projection position, one end of the linear laser projection pattern I (11) and the linear laser projection pattern II (12) intersect, and the intersection is located on the ruler-shaped laser projection pattern (10); at this time, the scale of the ruler-shaped laser projection pattern (10) is the same as the actual length scale, and the actual length of the object to be measured (13) can be read.

8. The method for using the non-contact laser projection ruler according to claim 7, characterized in that: The focal lengths of the scale laser diffraction grating (9) and the positioning laser diffraction grating (7) are equal, so when the linear laser projection pattern II (12) projected by the positioning laser diffraction grating (7) is at a suitable projection position, the scale laser diffraction grating (9) is also at a suitable projection position, that is, the scale of the scale laser projection pattern (10) is the same as the actual length scale.

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