Testing tool for measuring photoelectric deflectometer and measuring method thereof

Abstract

The invention provides a testing tool for measuring a photoelectric deflectometer and a measuring method thereof, and the testing tool for measuring the photoelectric deflectometer comprises an installation part which is used for stably supporting the whole testing tool; the target is installed on the installation part through a movement assembly, and the movement assembly is configured to drive the target installed on the movement assembly to move to different heights and enable the target to be used in cooperation with a photoelectric deflection instrument so as to simulate the deflection of a bridge; the range finder is mounted on the mounting piece and is used for measuring the horizontal distance between the photoelectric deflectometer and the target; the measuring part is installed on the installation part and matched with the movement assembly, the measuring part is used for obtaining the height value of the target in real time, the distance measuring instrument is matched with the measuring part so that the requirement for testing the photoelectric deflection instrument can be met, the requirement for dynamic monitoring of the on-site bridge deflection instrument can be met, installation is easy, convenient and reliable, and the measurement precision is high. The accuracy of data of the deflectometer can be measured in a short time.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge monitoring, and in particular relates to a testing tool for measuring a photoelectric deflection instrument and a measuring method thereof. Background Art

[0002] In the current field of measurement technology, photoelectric deflectometers are widely used as a high-precision measurement tool in various occasions that require accurate measurement of object deflection or displacement. However, there are some common problems with photoelectric deflectometers on the market, which limit their breadth and flexibility in practical applications.

[0003] First, the price of photoelectric deflectometers is generally high, which increases their cost of use to a certain extent, making it difficult for some users or research institutions with limited budgets to afford them. In addition, the use scenarios of photoelectric deflectometers are relatively limited, especially in outdoor long-distance measurements. Due to the interference and limitations of environmental factors, their measurement accuracy and stability are often difficult to guarantee.

[0004] Secondly, the measuring tooling of the photoelectric deflectometer is usually high-precision and large in size, so it needs to be used in specific environments such as laboratories. This limitation greatly restricts the application of the photoelectric deflectometer in outdoor or on-site measurements and cannot meet the measurement needs of some emergency or special occasions.

[0005] In addition, the photoelectric deflectometers on the market often have mismatches when installing targets. Since different users or research institutions use different types of test fixtures and targets, it is difficult to find a photoelectric deflectometer that can fully match all measurement needs. This mismatch problem not only affects the measurement accuracy, but also increases the user's operating difficulty and time cost.

[0006] Finally, the current photoelectric deflectometer measurement method used in laboratories is usually relatively simple, and can only measure in one fixed direction, and the object to be measured needs to be placed on a specific test fixture. This measurement method not only limits the flexibility and diversity of the measurement, but also makes the measurement process cumbersome and complicated. At the same time, since the measurement can only be performed on-site, it is impossible to achieve real-time remote monitoring and analysis of the measurement data.

[0007] In summary, the current photoelectric deflectometers on the market have problems such as high price, limited use scenarios, mismatched measuring tools, and single measurement methods. These problems limit the breadth and flexibility of photoelectric deflectometers in practical applications. Therefore, it is necessary to improve and optimize the photoelectric deflectometer to improve its measurement accuracy, stability, and applicability to meet the measurement needs of more users and research institutions. Summary of the invention

[0008] In order to solve the above technical problems, the present invention provides a test fixture for measuring a photoelectric deflection instrument and a measuring method thereof, which are used to solve the technical problems of the above background technology.

[0009] On the one hand, the invention provides the following technical solution: a test fixture for measuring a photoelectric deflectometer, comprising a mounting member for stably supporting the entire test fixture;

[0010] A target is mounted on the mounting member via a motion assembly, wherein the motion assembly is configured to drive the target mounted thereon to move to different heights and enable the target to be used in conjunction with a photoelectric deflectometer to simulate the disturbance of the bridge;

[0011] a rangefinder, mounted on the mounting member, for measuring the horizontal distance between the photoelectric deflectometer and the target;

[0012] A measuring member, which is mounted on the mounting member and matched with the motion component, and is used to obtain the height value of the target in real time;

[0013] Wherein, the distance meter and the measuring piece are adapted to meet the test of the photoelectric deflectometer.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: the test fixture is installed and fixed on a horizontal plane, the current position of the test fixture is set as the starting position of the caliper measurement, and the data on the caliper display screen is reset to zero; the target is adjusted to move to a suitable position to simulate the disturbance of the bridge by rotating the driving handle of the motion component, and the target drives the vernier of the caliper to move; the height distance of the vernier is obtained by using the caliper display screen, and the first horizontal distance from the photoelectric deflectometer to the target is measured by using a rangefinder; the vertical distance of the target movement is obtained by using the photoelectric deflectometer, and the second horizontal distance from the target to the photoelectric deflectometer is obtained; the first horizontal distance is compared with the second horizontal distance to see whether it is consistent, and the height distance is compared with the vertical distance to see whether it is consistent; if the first horizontal distance is inconsistent with the second horizontal distance, and / or the data on the caliper display screen is inconsistent with the vertical distance, an alarm signal is issued. Through the simple structure of the test fixture, it can be used outdoors and indoors, with high measurement accuracy, and the test fixture is relatively simple to manufacture and low in cost. Through the up and down movement of the target, a photoelectric deflectometer can simultaneously measure data of multiple targets at different distances. The horizontal distance measurement uses a high-precision laser distance meter (distance meter), and the vertical distance uses a high-precision vernier caliper (measuring piece), which can meet the dynamic monitoring of the on-site bridge deflection meter. The installation is simple, convenient and reliable, and the accuracy of the deflection meter data can be measured in a short time. It can be used on the on-site bridge, indoor and outdoor laboratories, and measure the photoelectric disturbance meter.

[0015] Furthermore, the motion assembly includes a screw rod disposed on the mounting member, a movable block disposed on the screw rod, and a driving handle for driving the screw rod to move, and the driving handle extends to the outside of the mounting member.

[0016] Furthermore, the motion assembly also includes a limiting column installed on the mounting member, the limiting column is adapted to the movable block, and the limiting column is used to limit the movable block from moving along the limiting column.

[0017] Furthermore, the mounting member includes a mounting plate and vertical plates detachably arranged at both ends of the mounting plate, and the two vertical plates form a containing space on one side of the mounting plate to facilitate the movement of the target.

[0018] Furthermore, a support block is installed on the mounting plate, and the support block is adapted to one of the vertical plates to form the movement space, and the support block is used to install the measuring piece.

[0019] Furthermore, a through hole is formed on the other vertical plate.

[0020] Furthermore, the target includes a bracket mounted on the motion component and a target body mounted on the bracket, the bracket includes a fixing plate, and connecting plates are bent at both ends of the fixing plate toward the target body to form a movable space between the two connecting plates.

[0021] Furthermore, the target body is mounted on the bracket through an adjusting member so that the target body can rotate around the bracket in the activity space, and the adjusting member includes a rotating head and a fastening nut: the rotating head is used to connect the target body to the bracket, and the fastening nut is used to lock or unlock the rotating head to fix the target body at a desired angle.

[0022] Furthermore, the measuring component includes a caliper, a caliper display connected to the caliper, and a connecting block connected to the caliper display, wherein the connecting block is connected to the target to facilitate obtaining the height value of the target, wherein the two bottom surfaces of the caliper are respectively flush with the two bottom surfaces of the mounting component.

[0023] On the other hand, the present invention also provides a method for measuring a test fixture for measuring a photoelectric deflectometer, the method comprising the following steps:

[0024] Fix the test fixture on a horizontal surface;

[0025] The current position of the test fixture is set as the starting position of the caliper measurement, and the data on the caliper display screen is reset to zero;

[0026] By rotating the driving handle of the motion assembly, the target is adjusted to move to a suitable position to simulate the disturbance of the bridge, and the target drives the vernier of the caliper to move;

[0027] Using a caliper display screen to obtain the height distance of the vernier ruler, and using a rangefinder to measure a first horizontal distance from the photoelectric deflectometer to the target;

[0028] Using a photoelectric deflectometer to obtain a vertical distance of movement of the target, and obtaining a second horizontal distance from the target to the photoelectric deflectometer;

[0029] Comparing whether the first horizontal distance is consistent with the second horizontal distance, and comparing whether the height distance is consistent with the vertical distance;

[0030] If the first horizontal distance is inconsistent with the second horizontal distance, and / or the data on the caliper display screen is inconsistent with the vertical distance, an alarm signal is issued. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the three-dimensional structure of the test fixture for measuring the photoelectric deflection instrument in the first embodiment of the present invention.

[0032] Figure 2 It is a side view of a test fixture for measuring the photoelectric deflection instrument in the first embodiment of the present invention.

[0033] Figure 3 FIG. 4 is a side view of a target in the first embodiment of the present invention.

[0034] Figure 4 The first embodiment of the present invention Figure 2 Enlarged schematic diagram at point A in the middle.

[0035] Figure 5 The first embodiment of the present invention Figure 4 Cross-sectional view at BB in the middle.

[0036] Figure 6 This is a flow chart of a test fixture measurement method for measuring a photoelectric deflectometer in the second embodiment of the present invention.

[0037] Explanation of the main component symbols: 10. Mounting part; 11. Mounting plate; 12. Vertical plate; 13. Accommodating space; 14. Support block; 15. Movement space; 16. Through hole; 20. Target; 21. Bracket; 211. Fixed plate; 212. Connecting plate; 213. Activity space; 22. Target body; 23. Adjusting part; 231. Rotating head; 232. Fastening nut; 30. Moving component; 31. Screw; 32. Movable block; 33. Driving handle; 34. Limiting column; 40. Rangefinder; 50. Measuring part; 51. Caliper; 52. Caliper display; 53. Connecting block; 531. Mounting part; 532. Connecting part; 533. Limiting groove; 534. Fixing screw.

[0038] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0039] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0040] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0042] See also Figure 1 to Figure 2 As shown, a test fixture for measuring a photoelectric deflectometer in a first embodiment of the present invention is shown.

[0043] A mounting member 10, which is used to stably support the entire test fixture;

[0044] A target 20, which is mounted on the mounting member 10 via a motion assembly 30, wherein the motion assembly 30 is configured to drive the target 20 mounted thereon to move to different heights, and enables the target 20 to be used in conjunction with a photoelectric deflectometer to simulate the disturbance of the bridge;

[0045] a distance meter 40 mounted on the mounting member 10 and used to measure the horizontal distance between the photoelectric deflectometer and the target 20;

[0046] A measuring member 50, which is mounted on the mounting member 10 and is adapted to the motion assembly 30, and the measuring member 50 is used to obtain the height value of the target 20 in real time;

[0047] The distance meter 40 and the measuring member 50 are adapted to meet the test of the photoelectric deflectometer.

[0048] In specific application, the test fixture is installed on a fixed horizontal plane, the current position of the test fixture is set as the starting position of the caliper 51 measurement, and the data on the caliper 51 display screen is reset to zero; the target 20 is adjusted to move to a suitable position to simulate the disturbance of the bridge by rotating the driving handle 33 of the motion assembly 30, and the target 20 drives the vernier of the caliper 51 to move; the height distance of the vernier is obtained by using the caliper 51 display screen, and the first horizontal distance from the photoelectric deflectometer to the target 20 is measured by using the rangefinder 40; the vertical distance of the target 20 movement is obtained by using the photoelectric deflectometer, and the second horizontal distance from the target 20 to the photoelectric deflectometer is obtained; the first horizontal distance is compared with the second horizontal distance to see whether it is consistent, and the height distance is compared with the vertical distance to see whether it is consistent; if the first horizontal distance is inconsistent with the second horizontal distance, and / or the data on the caliper 51 display screen is inconsistent with the vertical distance, an alarm signal is issued. The simple structure of the test fixture can be used outdoors and indoors, with high measurement accuracy. The test fixture is relatively simple to manufacture and has low cost. Through the up and down movement of the target 20, a photoelectric deflectometer can simultaneously measure the data of different distances of multiple targets 20. The horizontal distance measurement uses a high-precision laser rangefinder 40 (rangefinder 40), and the vertical distance uses a high-precision vernier caliper 51 (measuring piece 50), which can meet the dynamic monitoring of the on-site bridge deflectometer. The installation is simple, convenient and reliable, and the accuracy of the deflectometer data can be measured in a short time. The photoelectric deflectometer can be used on the on-site bridge, indoor and outdoor laboratories.

[0049] It can be seen that the test tooling can effectively solve the long-distance testing indoors and outdoors, the mobile testing method, the selection of multiple different scenes, the application of different targets 20, which can be easily replaced, and the height of the test tooling can be adjusted (the specific distance can be checked through the vernier caliper 51).

[0050] In this embodiment, the rangefinder 40 is a laser rangefinder 40, which measures the horizontal distance from the photoelectric disturbance meter to the target 20. The accuracy of this distance can reach the millimeter level, and the measurement method is reliable and fast.

[0051] Specifically, the motion assembly 30 includes a screw rod 31 disposed on the mounting member 10 , a movable block 32 disposed on the screw rod 31 , and a driving handle 33 for driving the screw rod 31 to move, and the driving handle 33 extends to the outside of the mounting member 10 .

[0052] More specifically, the motion assembly 30 further includes a limiting column 34 mounted on the mounting member 10 , the limiting column 34 being matched with the movable block 32 , and the limiting column 34 being used to limit the movable block 32 from moving along the limiting column 34 .

[0053] Specifically, the mounting member 10 includes a mounting plate 11 and vertical plates 12 detachably disposed at both ends of the mounting plate 11. The two vertical plates 12 form a receiving space 13 on one side of the mounting plate 11 to facilitate the movement of the target 20. The mounting plate 11 and the vertical plates 12 are connected by bolts.

[0054] More specifically, a support block 14 is mounted on the mounting plate 11, and the support block 14 is matched with one of the vertical plates 12 to form the movement space 15, and the support block 14 is used to mount the measuring member 50. A through hole 16 is formed on the other vertical plate 12.

[0055] See also Figure 3 As shown, specifically, the target 20 includes a bracket 21 mounted on the motion assembly 30, and a target body 22 mounted on the bracket 21, the bracket 21 includes a fixing plate 211, and connecting plates 212 are bent at both ends of the fixing plate 211 toward the target body 22, so that a movable space 213 is formed between the two connecting plates 212. In this embodiment, the bracket 21 is fixed to the movable block 32 of the motion assembly 30 by bolts.

[0056] Further, the target body 22 is mounted on the bracket 21 through an adjusting member 23 so that the target body 22 can rotate around the bracket 21 in the activity space 213. The adjusting member 23 includes a rotating head 231 and a fastening nut 232: the rotating head 231 is used to connect the target body 22 to the bracket 21, and the fastening nut 232 is used to lock or unlock the rotating head 231 to fix the target body 22 at a desired angle. By unlocking the rotating head 231 of the fastening nut 232, the target body 22 can be rotated relative to the bracket 21, thereby adjusting the angle between the target body 22 and the movable block 32. After adjusting to a suitable angle, the fastening nut 232 locks the rotating head 231.

[0057] See also Figures 4 to 5As shown, further, the measuring member 50 includes a caliper 51, a caliper 51 display connected to the caliper 51, and a connecting block 53 connected to the caliper 51 display, wherein the connecting block 53 is connected to the target 20 so as to obtain the height value of the target 20, wherein the two bottom surfaces of the caliper 51 are respectively flush with the two bottom surfaces of the mounting member 10. The connecting block 53 includes a mounting portion 531, a connecting portion 532 connected to the mounting portion 531, a limiting groove 533 provided on the connecting portion 532, and a fixing screw 534, wherein the mounting portion 531 and the connecting portion 532 are arranged in an L shape, the top of the limiting groove 533 passes through the top of the connecting portion 532, and the mounting portion 531 is mounted on the caliper 51 display. In this embodiment, a vernier scale is provided on the caliper 51, and the caliper 51 display and the connecting block 53 are installed on the vernier scale. In specific applications, first align the connecting portion 532 of the connecting block 53 on the caliper 51 display with the movable block 32 of the motion assembly 30, then pass the fixing screw 534 through the limiting groove 533 and the threaded hole opened on the movable block 32 in turn, and then tighten the fixing screw 534 to connect the connecting portion 532 and the movable block 32 together, thereby connecting the caliper 51 display and the movable block 32 together.

[0058] Embodiment 2

[0059] See also Figure 6 , shown is a test fixture measurement method for measuring a photoelectric deflectometer in a second embodiment of the present invention, the method comprising the following steps: step S01 to step S07;

[0060] S01, fix the test fixture on a horizontal surface;

[0061] S02, setting the current position of the test fixture as the starting position of the caliper measurement, and returning the caliper display screen data to zero;

[0062] S03, adjusting the target to move to a suitable position to simulate the disturbance of the bridge by rotating the driving handle of the motion assembly, and at the same time, the target drives the vernier of the caliper to move;

[0063] S04, using a caliper display screen to obtain the height distance of the vernier ruler, and using a rangefinder to measure a first horizontal distance from the photoelectric deflectometer to the target;

[0064] S05, using a photoelectric deflectometer to obtain a vertical distance of movement of the target, and obtaining a second horizontal distance from the target to the photoelectric deflectometer;

[0065] S06, comparing whether the first horizontal distance is consistent with the second horizontal distance, and comparing whether the height distance is consistent with the vertical distance;

[0066] S07: If the first horizontal distance is inconsistent with the second horizontal distance, and / or the data on the caliper display screen is inconsistent with the vertical distance, an alarm signal is issued.

[0067] In summary, the test fixture for measuring the photoelectric deflection meter and the measuring method thereof in the above-mentioned embodiments of the present invention are as follows: the test fixture is installed and fixed on a horizontal plane, the current position of the test fixture is set as the starting position of the caliper measurement, and the data on the caliper display screen is reset to zero; the target is adjusted to move to a suitable position to simulate the disturbance of the bridge by rotating the driving handle of the motion component, and the target drives the vernier of the caliper to move; the height distance of the vernier is obtained by using the caliper display screen, and the first horizontal distance from the photoelectric deflection meter to the target is measured by using a rangefinder; the vertical distance of the target movement is obtained by using the photoelectric deflection meter, and the second horizontal distance from the target to the photoelectric deflection meter is obtained; the first horizontal distance is compared with the second horizontal distance to see whether it is consistent, and the height distance is compared with the vertical distance to see whether it is consistent; if the first horizontal distance is inconsistent with the second horizontal distance, and / or the data on the caliper display screen is inconsistent with the vertical distance, an alarm signal is issued. The simple structure of the test fixture can be used outdoors and indoors, with high measurement accuracy, and the test fixture is relatively simple to manufacture and low in cost. Through the up and down movement of the target, a photoelectric deflectometer can measure the data of multiple targets at different distances at the same time. The horizontal distance measurement uses a high-precision laser rangefinder (rangefinder), and the vertical distance uses a high-precision vernier caliper (measuring piece), which can meet the dynamic monitoring of the on-site bridge deflectometer. The installation is simple, convenient and reliable, and the accuracy of the deflectometer data can be measured in a short time. The photoelectric deflectometer can be used on the on-site bridge, indoor and outdoor laboratories.

[0068] It can be seen that the test tooling can effectively solve the problems of long-distance indoor and outdoor testing, mobile testing methods, multiple scene options, suitable for different targets, easy replacement, and adjustable height of the test tooling (check the specific distance through a vernier caliper).

[0069] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0070] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A test fixture for measuring a photoelectric deflectometer, characterized in that: include: A mounting part, which is used to stably support the entire test fixture; A target is mounted on the mounting member via a motion assembly, wherein the motion assembly is configured to drive the target mounted thereon to move to different heights and enable the target to be used in conjunction with a photoelectric deflectometer to simulate the disturbance of the bridge; a rangefinder, mounted on the mounting member, for measuring the horizontal distance between the photoelectric deflectometer and the target; A measuring member, which is mounted on the mounting member and matched with the motion component, and is used to obtain the height value of the target in real time; Wherein, the distance meter and the measuring piece are adapted to meet the test of the photoelectric deflectometer.

2. The test fixture for measuring the photoelectric deflection instrument according to claim 1, characterized in that: The motion assembly comprises a screw rod arranged on the mounting member, a movable block arranged on the screw rod and a driving handle for driving the screw rod to move, and the driving handle extends to the outside of the mounting member.

3. The test fixture for measuring the photoelectric deflection instrument according to claim 2, characterized in that: The motion assembly further comprises a limiting column mounted on the mounting member, the limiting column being matched with the movable block, and the limiting column being used for limiting the movable block from moving along the limiting column.

4. The test fixture for measuring the photoelectric deflectometer according to claim 1, characterized in that: The mounting member comprises a mounting plate and vertical plates detachably arranged at two ends of the mounting plate, and the two vertical plates form a containing space on one side of the mounting plate to facilitate the movement of the target.

5. The test fixture for measuring the photoelectric deflectometer according to claim 4, characterized in that: A support block is mounted on the mounting plate, and the support block is matched with one of the vertical plates to form the movement space. The support block is used to mount the measuring piece.

6. The test fixture for measuring the photoelectric deflectometer according to claim 5, characterized in that: A through hole is formed on the other vertical plate.

7. The test fixture for measuring the photoelectric deflectometer according to claim 1, characterized in that: The target includes a bracket installed on the motion component and a target body installed on the bracket. The bracket includes a fixing plate. Both ends of the fixing plate are bent with connecting plates in a direction close to the target body to form a movable space between the two connecting plates.

8. The test fixture for measuring the photoelectric deflectometer according to claim 7, characterized in that: The target body is mounted on the bracket through an adjusting member so that the target body can rotate around the bracket in the activity space. The adjusting member includes a rotating head and a fastening nut: the rotating head is used to connect the target body to the bracket, and the fastening nut is used to lock or unlock the rotating head to fix the target body at a desired angle.

9. The test fixture for measuring the photoelectric deflectometer according to claim 1, characterized in that: The measuring component includes a caliper, a caliper display connected to the caliper, and a connecting block connected to the caliper display, wherein the connecting block is connected to the target to obtain the height value of the target, wherein the two bottom surfaces of the caliper are respectively flush with the two bottom surfaces of the mounting component.

10. A method for measuring the test fixture for measuring the photoelectric deflectometer according to claims 1 to 9, characterized in that: The method comprises the following steps: Fix the test fixture on a horizontal surface; The current position of the test fixture is set as the starting position of the caliper measurement, and the data on the caliper display screen is reset to zero; By rotating the driving handle of the motion assembly, the target is adjusted to move to a suitable position to simulate the disturbance of the bridge, and the target drives the vernier of the caliper to move; Using a caliper display screen to obtain the height distance of the vernier ruler, and using a rangefinder to measure a first horizontal distance from the photoelectric deflectometer to the target; Using a photoelectric deflectometer to obtain a vertical distance of movement of the target, and obtaining a second horizontal distance from the target to the photoelectric deflectometer; Comparing whether the first horizontal distance is consistent with the second horizontal distance, and comparing whether the height distance is consistent with the vertical distance; If the first horizontal distance is inconsistent with the second horizontal distance, and / or the data on the caliper display screen is inconsistent with the vertical distance, an alarm signal is issued.

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