Height difference measuring device

Abstract

A height difference measuring device for measuring a height difference between a first position and a second position in a lower surface of an object, comprising: a first measuring device comprising a first scale and a first fixing member, the first fixing member suspending the first scale to the first position; and a second measuring device comprising a second scale and a second fixing member, the second fixing member suspending the second scale to the second position. The first measuring device further comprises a first verticality calibration piece indicating the first fixing member to adjust the first scale to extend vertically; the second measuring device further comprises a second verticality calibration piece indicating the second fixing member to adjust the second scale to extend vertically; and the height difference measuring device further comprises a height difference indicating piece indicating a height difference of the first scale and the second scale in the same horizontal position. The height difference measuring device is simple in operation and accurate in indication.

Description

Technical Field

[0001] This utility model relates to the field of measurement, specifically to a height difference measuring device. Background Technology

[0002] To ensure good geometric symmetry between the aircraft's wings and fuselage after docking, and to prevent abnormal rolling aerodynamic moments caused by local asymmetry in angle of attack, it is necessary to measure and check the wing's angle of installation or torsion angle. During measurement, the horizontal height difference between two positions before and after certain specific cross-sections on the wing surface needs to be measured to characterize the pitch attitude of that cross-section.

[0003] There are generally three types of existing measurement methods.

[0004] One method is based on a level instrument. This involves placing the level instrument on the ground and suspending a leveling rod downwards at the measurement points on the lower surface of the wing. By measuring the readings on the leveling rod at different points on the instrument's plane, the height difference between the various measurement points can be calculated. This method is intuitive and time-saving, but it requires a level instrument and at least two people to complete.

[0005] Another method involves fixing a specialized fixture at a specific location on the wing surface and placing an inclinometer on the fixture to read the angle between the fixture's reference plane and the horizontal plane. This type of fixture needs to span a certain length and be fixed to the wing at both the front and rear positions. It requires strong rigidity to prevent deformation, resulting in a heavy weight that makes handling and use inconvenient. Furthermore, the heavy fixture itself can cause additional deformation to the wing, affecting measurement accuracy.

[0006] Another method is based on laser trackers or other laser measurement equipment. This involves establishing a horizontal plane and a measurement coordinate system at multiple points on the ground, and then measuring the position of the wing's measuring points within this coordinate system to obtain the elevation difference. The advantage of this method is high precision, but the laser measurement equipment is expensive and relatively complex to operate, requiring at least two people to complete the task.

[0007] Therefore, there is a need to provide an improved height difference measuring device that can solve the problems and defects existing in the prior art. Utility Model Content

[0008] The purpose of this invention is to provide a height difference measuring device that is simple in structure, easy to operate, and has low labor costs.

[0009] According to this disclosure, a height difference measuring device is proposed for measuring the height difference between a first position and a second position on the lower surface of an object, comprising: a first measuring device including a first scale and a first fixing member, the first fixing member suspending and fixing the first scale to the first position; and a second measuring device including a second scale and a second fixing member, the second fixing member suspending and fixing the second scale to the second position. The first measuring device further includes a first verticality calibration member, which instructs the first fixing member to adjust the first scale to a vertical extension; the second measuring device further includes a second verticality calibration member, which instructs the second fixing member to adjust the second scale to a vertical extension; the height difference measuring device also includes a height difference indicator, which indicates the height difference between the first scale and the second scale at the same horizontal level.

[0010] The first and second fixing components can conveniently and quickly fix the first and second scales into place, respectively. Furthermore, the first and second verticality calibration components can assist the operator in quickly adjusting the angles of the first and second scales, ensuring their vertical extension. Therefore, the height difference between the first and second scales indicated by the height difference indicator is the height difference between the first and second positions of the object's lower surface.

[0011] In one embodiment of this disclosure, the height difference indicator includes a first tube, a second tube, and a connecting tube that fluidly connects the first tube and the second tube, wherein the first tube and the second tube are transparent and open to the atmosphere; and wherein the first tube is attached to the first scale parallel to an extension axis of the first scale, and the second tube is attached to the second scale parallel to an extension axis of the second scale. Alternatively, the first scale and the second scale may be hollow and transparent, wherein the height difference indicator includes a connecting tube that fluidly connects the first scale and the second scale.

[0012] In another embodiment of this disclosure, the height difference indicator includes a laser emitter and a laser receiver, wherein the laser emitter is mounted to a first scale and is movable up and down relative to the first scale, and the laser receiver is mounted to a second scale and is movable up and down relative to the second scale; and wherein the laser beam emitted by the laser emitter is perpendicular to the extension axis of the first scale.

[0013] According to another aspect of this disclosure, a first ruler abuts its upper end against a first position and a first verticality calibrator is fixed to its lower end, wherein the first verticality calibrator includes: a first angle indicator, wherein the center scale of the first angle indicator is located on an extension axis of the first ruler; a first plumb bob, the first plumb bob being suspended from the lower end of the first ruler; and a second ruler abuts its upper end against a second position and a second verticality calibrator is fixed to its lower end, wherein the second verticality calibrator includes: a second angle indicator, wherein the center scale of the second angle indicator is located on an extension axis of the second ruler; and a second plumb bob, the second plumb bob being suspended from the lower end of the second ruler. Alternatively or additionally, the first verticality calibrator may include a first level fixed to the lower end of the first ruler, and the second verticality calibrator includes a second level fixed to the lower end of the second ruler.

[0014] According to another aspect of this disclosure, the first fixing member includes: a first positioning rod and a second positioning rod, the first positioning rod and the second positioning rod being hinged to a first scale at one end and respectively hinged to a first fixing member and a second fixing member at their other ends, wherein the first fixing member and the second fixing member are respectively fixed to the lower surface of the object; and a first connecting rod and a second connecting rod, the first connecting rod and the second connecting rod being connected together to the first scale at one end and respectively connected to the first positioning rod and the second positioning rod at their other ends, wherein the first connecting rod is movable between the first positioning rod and the first scale, and the second connecting rod is movable between the second positioning rod and the first scale, and wherein the first connecting rod and the second connecting rod are coplanar. The second fixing component includes: a third positioning rod and a fourth positioning rod, which are hinged at one end to a second scale and at the other end to a third fixing member and a fourth fixing member, respectively, wherein the third fixing member and the fourth fixing member are respectively fixed to the lower surface of the object; and a third link and a fourth link, which are connected at one end to the second scale and at the other end to the third positioning rod and the fourth positioning rod, respectively, wherein the third link can move between the third positioning rod and the second scale, and the fourth link can move between the fourth positioning rod and the second scale, and wherein the third link and the fourth link are coplanar.

[0015] According to another aspect of this disclosure, the first fixing member further includes a first sleeve fitted onto the first positioning rod, a second sleeve fitted onto the second positioning rod, and a third sleeve fitted onto the first scale. A first connecting rod is hinged to the first sleeve and the third sleeve, and a second connecting rod is hinged to the second sleeve and the third sleeve. The second fixing member further includes a fourth sleeve fitted onto the third positioning rod, a fifth sleeve fitted onto the fourth positioning rod, and a sixth sleeve fitted onto the second scale. A third connecting rod is hinged to the fourth sleeve and the sixth sleeve, and the fourth connecting rod is hinged to the fifth sleeve and the sixth sleeve.

[0016] According to another aspect of this disclosure, the third sleeve is fixed to the first scale, and the sixth sleeve is fixed to the second scale.

[0017] According to another aspect of this disclosure, the first fastener and the second fastener are fixed to the lower surface of the object by means of adsorption or adhesion.

[0018] This utility model's height difference measuring device suspends scales at two locations where the height difference is to be measured. It uses a device, such as a laser or a liquid open to the atmosphere, to determine the same horizontal level at the two locations. The height difference is determined by reading the difference in scale readings at this horizontal level. Its structure is simple, using only a set of positioning rods and connecting rods to fix the scales to the lower surface of the wing. Therefore, it is simple and convenient to operate, provides accurate indication, and can be completed by a single person for both scale fixing and height difference measurement. Attached Figure Description

[0019] To gain a more complete understanding of this disclosure, reference can be made to the following description of exemplary embodiments taken in conjunction with the accompanying drawings. The drawings are not intended to limit this disclosure to the specific embodiments depicted therein, and are not necessarily to scale. In the drawings:

[0020] Figure 1 This is a front view schematic diagram of the first embodiment of the height difference measuring device of this utility model, showing the lower surface of the wing on which the canopy measuring device is mounted; and

[0021] Figure 2 This is a front view schematic diagram of a second embodiment of the height measuring device of this utility model, showing the lower surface of the wing on which the canopy measuring device is mounted.

[0022] List of reference numerals

[0023] 100 Height Difference Measuring Device

[0024] 1. First measuring device

[0025] 3 First scale

[0026] 31 Upper end

[0027] 32 Lower end

[0028] 4 First fixed component

[0029] 41 First positioning rod

[0030] 42 Second positioning rod

[0031] 43 First fastener

[0032] 44 Second fastener

[0033] 45 First Link

[0034] 46 Second Link

[0035] 47 First Sleeve

[0036] 48 Second Sleeve

[0037] 49 Third Sleeve

[0038] 5 First verticality calibration piece

[0039] 51 First Angle Indicator 52 First Plumb Line

[0040] 53 First level ruler 2 Second measuring device

[0041] 6 Second scale

[0042] 61 Upper end

[0043] 62 Lower end

[0044] 7 Second fixed component

[0045] 71 Third positioning rod

[0046] 72 Fourth positioning rod

[0047] 73 Third fastener

[0048] 74 Fourth fastener

[0049] 75 Third Link

[0050] 76 Fourth Link

[0051] 77 Fourth Sleeve

[0052] 78 Fifth Sleeve

[0053] 79 Sixth Sleeve

[0054] 8 Second verticality calibration piece

[0055] 81 Second Angle Indicator

[0056] 82 Second plumb bob

[0057] 83 Second Horizontal Ruler

[0058] 9 / 9' Height Difference Indicator

[0059] 91 First tube

[0060] 92 Second tube

[0061] 93 Connecting pipe

[0062] 91' laser emitter

[0063] 92' laser receiver

[0064] 200 The lower surface of the object

[0065] 201 First Position

[0066] 202 Second position

[0067] Y (vertical direction)

[0068] X3 Extension axis of the first scale

[0069] X6 Extension axis of the second scale

[0070] A laser optical path Detailed Implementation

[0071] The following description of specific embodiments of this utility model refers to the accompanying drawings, which illustrate particular embodiments in which the utility model can be practiced. The embodiments are intended to describe various aspects of the utility model in sufficient detail to enable those skilled in the art to practice it. Other embodiments and changes may be utilized without departing from the scope of the utility model. Therefore, the following description of specific embodiments should not be considered limiting. The scope of this utility model is defined only by the appended claims and the full scope of their equivalents. The same reference numerals are used throughout the drawings and specific embodiments to refer to the same or similar parts.

[0072] The first scale 3 and the second scale 6 are generally strip-shaped or tubular, and have extending axes X3 and X6 respectively. The directional terms "upper" and "lower" used herein refer to their positions relative to the working position of the height difference measuring device 100 (the first scale 3 and the second scale 6 are vertical). Figure 1 and Figure 2 The view shown is defined by rotating it 90° clockwise; the term "vertical direction Y" refers to the direction in which a strip is suspended under gravity, with the resultant force at a non-zero angle to the direction of gravity being zero, and is perpendicular to the ground plane; the term "horizontal" is parallel to the ground plane and perpendicular to the vertical direction. The term "height difference" refers to the difference in the vertical direction between two positions or objects.

[0073] Figure 1A first embodiment of an altitude difference measuring device 100 is shown. As shown, the altitude difference measuring device 100 generally includes a first measuring device 1 having a first scale 3 and a second measuring device 2 having a second scale 6. The first scale 3 and the second scale 6 are respectively suspended and fixed to a first position 201 and a second position 202 in the lower surface 200 of an object, such as the lower surface of an aircraft wing. The first scale 3 and the second scale 6 are each having a scale. Furthermore, an altitude difference indicator 9 is used to measure the scale values ​​of the first scale 3 and the second scale 6 at the same horizontal position, and the difference between their scale values ​​is the altitude difference between the first position 201 and the second position 202 of the lower surface 200 of the object.

[0074] Now turning to the first measuring device 1. The first measuring device 1 includes a first scale 3, a first fixing member 4 that suspends and fixes the first scale 3 to a first position 201, and a first verticality calibration member 5 that assists the operator in adjusting the verticality of the first scale 3. The first scale 3 abuts against the first position 201 of the lower surface 200 of the object at its upper end 31, and is connected to the first verticality calibration member 5 at its lower end 32.

[0075] The first fixing member 4 includes a first positioning rod 41 and a second positioning rod 42, both of which are hinged at one end to a first scale 3, specifically, hinged to the lower end of the first scale 3; the first positioning rod 41 is hinged at its other end to a first fixing member 43, and the second positioning rod 42 is hinged at its other end to a second fixing member 44. The first fixing member 43 and the second fixing member 44 are respectively fixed to the lower surface 200 of the object, which can be done by adsorption or adhesion.

[0076] To ensure that the first positioning rod 41 and the second positioning rod 42 can securely fix the first ruler 3 to the first position 201 of the lower surface 200 of the adjacent object, the first fixing member 4 further includes a first connecting rod 45 located between and connecting the first ruler 3 and the first positioning rod 41, and a second connecting rod 46 located between and connecting the first ruler 3 and the second positioning rod 42. Specifically, the first connecting rod 45 and the second connecting rod 46 are connected together at one end and are jointly connected to the first ruler 3; the first connecting rod 45 is connected to the first positioning rod 41 at its opposite end, and the second connecting rod 46 is connected to the second positioning rod 42 at its opposite end. The first connecting rod 45 and the second connecting rod 46 are coplanar, and the first connecting rod 45 can move between the first positioning rod 41 and the first ruler 3, while the second connecting rod 46 can move between the second positioning rod 42 and the first ruler 3.

[0077] Preferably, a first sleeve 47 that can slide along the first positioning rod 41 is fitted onto the first positioning rod 41, a second sleeve 48 that can slide along the second positioning rod 42 is fitted onto the second positioning rod 42, and a third sleeve 49 is fitted onto the first scale 3. A first connecting rod 45 is hinged to the first sleeve 47 and the third sleeve 49 at its two ends, respectively, while a second connecting rod 46 is hinged to the second sleeve 48 and the third sleeve 49 at its two ends, respectively. In this way, through the movement of the first connecting rod 45 and the second connecting rod 46, the first positioning rod 41 and the second positioning rod 42 can adjust their hinge angles as needed. After reaching the required angle and being fixed in place by means of the first fixing member 43 and the second fixing member 44, the first scale 3 is fixed in a first position 201 with its upper end 31 vertically suspended against the lower surface 200 of the object by the limiting effect of the first connecting rod 45 and the second connecting rod 46, which are always in the same plane.

[0078] The third sleeve 49 can slide along the first scale 3, but it can also be fixed to the first scale 3 so that the first link 45 and the second link 46 have a better limiting effect.

[0079] The first verticality calibration component 5 includes a first angle indicator 51 and a first plumb bob 52. As shown in the figure, the first angle indicator 51 is fixed to the lower end 32 of the first scale 3, with its scale located at the end of the first angle indicator 51 opposite to the first scale 3. The first angle indicator 51 is positioned such that its center scale (i.e., the exact center of its scale end) is on the extension axis X3 of the first scale 3. The first plumb bob 52 is suspended from the lower end 32 of the first scale 3, and therefore always extends in the vertical direction Y under the influence of gravity. When the first plumb bob 52 points to the center scale of the first angle indicator 51, the first scale 3 is vertical.

[0080] Alternatively or additionally, a first level 53 may be used as a first verticality calibration element 5. The first level 53 is mounted to the lower end 32 of the first scale 3 perpendicular to the extension axis X3 of the first scale 3.

[0081] Therefore, the steps for positioning the first scale 3 at the first position 201, which is vertically suspended against the lower surface 200 of the object to be measured, are as follows:

[0082] - The upper end 31 of the first ruler 3 is placed against the first position 201, and one of the first fixing member 43 and the second fixing member 44 is fixed to the lower surface 200 of the object;

[0083] - Adjust the position of the other of the first fixing member 43 and the second fixing member 44, and the corresponding one of the first positioning rod 41 and the second positioning rod 42, so that the first plumb bob 52 points to the center scale of the first angle indicator 51, and / or the first level 53 indicates horizontal, at which time the first scale 3 is vertical, and fix the adjusted first fixing member 43 or the second fixing member 44 to the lower surface 200 of the object.

[0084] - Tighten the hinge between the first positioning rod 41, the second positioning rod 42 and the first scale 3 to lock the first scale 3 in place.

[0085] The second scale 6 of the second measuring device 2 is fixed at a second position 202, vertically suspended and adjacent to the lower surface 200 of the object. The structure of the second measuring device 2 is similar to that of the first measuring device 1, therefore, only the components of the second measuring device 2 will be briefly described below.

[0086] The second measuring device 2 includes a second scale 6, a second fixing member 7 for fixing the second scale 6 in place, and a second verticality calibration member 8 for calibrating the verticality of the second scale 6. The second scale 6 abuts at a second position 202 on the lower surface 200 of an object at its upper end 61, and the second verticality calibration member 8 is mounted at its lower end 62. The second verticality calibration member 8 includes a second angle indicator 81 and a second plumb bob 82, and / or a second level 83. When using the second angle indicator 81, the second angle indicator 81 is fixed to the lower end 62 of the second scale 6, and its center scale is located on the extension axis X6 of the second scale 6, while the second plumb bob 82 is suspended to the lower end 62 of the second scale 6 by means of a flexible material such as a rope. When using the second level 83, similar to the first measuring device 1, the second level 83 is mounted to the lower end 62 of the second scale 6 perpendicular to the extension axis of the second scale 6. The second level 83 and the second angle indicator 81 can be used alone or in combination.

[0087] The second fixing member 7 includes a third positioning rod 71 and a fourth positioning rod 72, which are hinged together at one end to the lower end 62 of the second scale 6, and respectively hinged to the third fixing member 73 and the fourth fixing member 74 at their opposite ends. The third fixing member 73 and the fourth fixing member 74 can be fixed to the lower surface 200 of the object by magnetic attraction, adhesion, or other means.

[0088] To securely fix the second scale 6 in place, the second fixing member 7 further includes a third link 75 and a fourth link 76. The third link 75 is preferably hinged at one end to a fourth sleeve 77 fitted onto the third positioning rod 71, and at the other end to a sixth sleeve 79 fitted onto the second scale 6; while the fourth link 76 is preferably hinged at one end to a fifth sleeve 78 fitted onto the fourth positioning rod 72, and at the other end to the sixth sleeve 79. The third link 75 and the fourth link 76 are constrained to be in the same plane; the fourth sleeve 77 and the fifth sleeve 78 can slide along the third positioning rod 71 and the fourth positioning rod 72 respectively, while the sixth sleeve 79 can slide along the second scale 6 or be fixed to the second scale 6. In this way, the third link 75 can move relative to the third positioning rod 71 and the second scale 6, while the fourth link 76 can move relative to the fourth positioning rod 72 and the second scale 6, thereby allowing the third positioning rod 71 and the fourth positioning rod 72 to adjust their positions so that the second scale 6 is vertical, and after the third positioning rod 71 and the fourth positioning rod 72 are fixed in place, the second scale 6 is fixed vertically and suspended against the second position 202.

[0089] The steps for adjusting and fixing the second scale 6 are the same as those for adjusting and fixing the first scale 3, and will not be repeated here.

[0090] Now switch to the height difference indicator. Figure 1 The height difference indicator 9 of the first embodiment is shown, while Figure 2 The height difference indicator 9' of the second embodiment is shown.

[0091] like Figure 1 As shown, the height difference indicator 9 includes a first tube 91 and a second tube 92, both of which are transparent. The first tube 91 is attached to the first scale 3 parallel to the extension axis X3, while the second tube 92 is attached to the second scale 6 parallel to the extension axis X6. The first tube 91 and the second tube 92 are respectively connected to the atmosphere, preferably at their upper ends.

[0092] The height difference indicator 9 also includes a connecting pipe 93 that fluidly connects the first pipe 91 and the second pipe 92. This connecting pipe 93 is preferably a flexible pipe, such as… Figure 1 As shown, it is connected to the lower ends of the first tube 91 and the second tube 92 at its two ends respectively.

[0093] In this way, after liquid is injected, the liquid levels in the first tube 91 and the second tube 92 will always be at the same level. After fixing the first scale 3 and the second scale 6 in place, read the scale value of the first scale 3 at the liquid level in the first tube 91 and the scale value of the second scale 6 at the liquid level in the second tube 92. The difference between these two scale values ​​is the height difference between the first position 201 and the second position 202 of the lower surface 200 of the object.

[0094] Alternatively, in an alternative embodiment, instead of using separate first tubes 91 and second tubes 92, the first scale 3 and second scale 6 can be configured as hollow transparent tubes connected to the atmosphere, and a flexible connecting tube 93 can be used to fluidly connect the first scale 3 and the second scale 6. After liquid is injected, the liquid levels in the first scale 3 and the second scale 6 remain at the same level. By reading the two scale values ​​at these liquid levels and calculating the difference, the height difference between the first position 201 and the second position 202 of the lower surface 200 of the object can be obtained.

[0095] Figure 1 The dotted lines in the diagram schematically show the positions of the liquid levels at the same level in the first tube 91 and the second tube 92.

[0096] Go to Figure 2 The height difference indicator 9' includes a laser emitter 91' mounted to a first scale 3 and a laser receiver 92' mounted to a second scale 6. The laser emitter 91' is mounted to move up and down along the first scale 3, while the laser receiver 92' is mounted to move up and down along the second scale 6. Figure 2 The laser path A of the laser emitter 91' is marked with a horizontal dashed line. The angular position of the laser emitter 91' relative to the first scale 3 is adjusted so that its laser path A is perpendicular to the extension axis X3 of the first scale 3.

[0097] When using the height difference indicator 9', after fixing the first scale 3 and the second scale 6 in place, actuate the laser emitter 91' on the first scale 3 to emit a laser, and then adjust the position of the laser receiver 92' on the second scale 6 to receive the laser. After adjustment, read the scale value of the position of the laser emitter 91' on the first scale 3 and the scale value of the position of the laser receiver 92' on the second scale 6. The difference between these two scale values ​​is the height difference between the first position 201 and the second position 202 of the lower surface 200 of the object.

[0098] This utility model's height difference measuring device uses a simple fixing device and verticality calibration component to fix the scale to the position to be measured and calibrate it to extend vertically. Fixing and calibration of the scale can be easily completed by a single worker. Furthermore, the height difference indicator used in this device provides clear and easy-to-understand indications, avoiding complex measurement and calculation processes. Therefore, it solves the problems of complex structure, cumbersome operation, high labor costs, and low work efficiency in existing height difference measuring devices.

[0099] As used herein, the terms “comprising,” “including,” “having,” or any other variation thereof are intended to cover non-exclusive inclusion. For example, a method, article, or apparatus that includes a list of elements is not necessarily limited to those elements and may also include other elements not expressly listed or inherent to the method, article, or apparatus.

[0100] This utility model is not limited to the above embodiments, which are merely illustrative and not restrictive. Those skilled in the art, under the guidance of this utility model, can make any possible changes and modifications without departing from the spirit and scope of the claims. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model, without departing from its scope of protection, fall within the scope defined by the claims.

Claims

1. A height difference measuring device for measuring the height difference between a first position and a second position on the lower surface of an object, comprising: A first measuring device, the first measuring device including a first scale and a first fixing member, the first fixing member suspending and fixing the first scale to the first position; as well as The second measuring device includes a second scale and a second fixing member, the second fixing member suspending and fixing the second scale to the second position. Its features are, The first measuring device further includes a first verticality calibration element, which instructs the first fixing member to adjust the first scale to extend vertically; The second measuring device further includes a second verticality calibration element, which instructs the second fixing member to adjust the second scale to extend vertically; The height difference measuring device further includes a height difference indicator, which indicates the height difference between the first scale and the second scale when they are at the same horizontal position.

2. The height difference measuring device according to claim 1, characterized in that, The height difference indicator includes a first pipe, a second pipe, and a connecting pipe that provides fluid communication between the first pipe and the second pipe. The first tube and the second tube are transparent and open to the atmosphere; Furthermore, the first tube is attached to the first scale parallel to the extension axis of the first scale, while the second tube is attached to the second scale parallel to the extension axis of the second scale.

3. The height difference measuring device according to claim 1, characterized in that, The first and second scales are hollow and transparent, wherein the height difference indicator includes a connecting tube that fluidly connects the first and second scales.

4. The height difference measuring device according to claim 1, characterized in that, The height difference indicator includes a laser emitter and a laser receiver. The laser emitter is mounted on the first scale and can move up and down relative to the first scale, while the laser receiver is mounted on the second scale and can move up and down relative to the second scale. Furthermore, the laser beam emitted by the laser emitter is perpendicular to the extension axis of the first scale.

5. The height difference measuring device according to claim 1, characterized in that, The first scale rests against the first position with its upper end, and the first verticality calibration component is fixed with its lower end, wherein the first verticality calibration component includes: A first angle indicator dial, wherein the center scale of the first angle indicator dial is located on the extended axis of the first scale; A first plumb bob, suspended from the lower end of the first scale; and a second scale with its upper end abutting against the second position and its lower end fixed to the second verticality calibration component, wherein the second verticality calibration component includes: A second angle indicator dial, wherein the center scale of the second angle indicator dial is located on the extended axis of the second scale; The second plumb bob is suspended and connected to the lower end of the second scale.

6. The height difference measuring device according to claim 1 or 5, characterized in that, The first verticality calibration component includes a first horizontal ruler fixed to the lower end of the first scale, while the second verticality calibration component includes a second horizontal ruler fixed to the lower end of the second scale.

7. The height difference measuring device according to claim 1, characterized in that, The first fixing member includes: A first positioning rod and a second positioning rod, each hinged at one end to the first scale, and at the other end to a first fixing member and a second fixing member, respectively, wherein the first fixing member and the second fixing member are respectively fixed to the lower surface of the object; and A first link and a second link are connected at one end to the first scale, and at the other end to the first positioning rod and the second positioning rod, respectively. The first link can move between the first positioning rod and the first scale, while the second link can move between the second positioning rod and the first scale. Furthermore, the first link and the second link are coplanar; The second fixing member includes: A third positioning rod and a fourth positioning rod, each hinged at one end to the second scale, and at the other end to a third fixing member and a fourth fixing member, respectively, wherein the third fixing member and the fourth fixing member are respectively fixed to the lower surface of the object; and The third and fourth links are connected together at one end to the second scale, and at the other end to the third and fourth positioning rods, respectively. The third link is movable between the third positioning rod and the second scale, while the fourth link is movable between the fourth positioning rod and the second scale. Furthermore, the third link and the fourth link are coplanar.

8. The height difference measuring device according to claim 7, characterized in that, The first fixing component further includes a first sleeve fitted onto the first positioning rod, a second sleeve fitted onto the second positioning rod, and a third sleeve fitted onto the first scale. Wherein, the first connecting rod is hinged to the first sleeve and the third sleeve, and the second connecting rod is hinged to the second sleeve and the third sleeve; The second fixing component further includes a fourth sleeve fitted onto the third positioning rod, a fifth sleeve fitted onto the fourth positioning rod, and a sixth sleeve fitted onto the second scale. The third link is hinged to the fourth and sixth sleeves, and the fourth link is hinged to the fifth and sixth sleeves.

9. The height difference measuring device according to claim 8, characterized in that, The third sleeve is fixed to the first scale, and the sixth sleeve is fixed to the second scale.

10. The height difference measuring device according to claim 7, characterized in that, The first and second fasteners are fixed to the lower surface of the object by means of adsorption or adhesion.

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