Detection tool for detecting the installation accuracy of a steel strip to a steel strip wheel

Abstract

This application relates to a testing tool for detecting the installation accuracy of a steel belt and a steel pulley. The steel pulley has at least one pair of grooves on its rim, the line connecting the centers of the pair of grooves being parallel to the axis of the steel pulley. The testing tool includes a positioning rod, a measuring rod, and a scale plate. The positioning rod is configured to engage with the pair of grooves and move along the axis of the steel pulley. One end of the measuring rod is hinged to the middle of the positioning rod. The scale plate is connected to the positioning rod and has angle graduations indicating the angle between the measuring rod and the positioning rod. Using this testing tool, the angle between the side of the steel belt and the axis of the steel pulley can be measured, thereby determining the actual installation accuracy of the steel belt and pulley. In cases of poor installation accuracy, the steel belt and / or pulley can be adjusted promptly to improve the installation accuracy, thus contributing to a longer service life and improved operational safety of the steel belt elevator.

Description

Technical Field

[0001] This application relates to the field of elevator installation technology, and in particular to a testing tool for detecting the installation accuracy of steel belts and steel belt pulleys. Background Technology

[0002] Steel belt elevators are equipped with multiple steel belt pulleys that have a transmission relationship with the steel belt, such as traction pulleys, car anti-cord pulleys, and counterweight anti-cord pulleys. The installation accuracy between the steel belt and the steel belt pulleys will affect the installation quality of the steel belt elevator, and the installation quality will further affect the service life and operational safety of the steel belt elevator.

[0003] However, the current installation sites for steel belt elevators lack readily available testing tools to check the installation accuracy of the steel belt and pulleys. As a result, the installation quality varies greatly across different locations, posing potential safety hazards. Utility Model Content

[0004] This application provides a testing tool for detecting the installation accuracy of steel belts and steel belt pulleys, which is designed to detect and calibrate the installation accuracy of steel belts and steel belt pulleys, thereby improving the installation quality of steel belt elevators.

[0005] The specific technical solution is as follows: This application provides a testing tool for detecting the installation accuracy of a steel belt and a steel belt pulley. The steel belt pulley has at least one pair of slots on its rim, and the line connecting the centers of the pair of slots is parallel to the axis of the steel belt pulley. The testing tool includes a positioning rod, a measuring rod, and a scale plate. The positioning rod is configured to be engaged in the pair of slots and can move along the axis of the steel belt pulley. One end of the measuring rod is hinged to the middle of the positioning rod. The scale plate is connected to the positioning rod and has angle scale lines indicating the angle between the measuring rod and the positioning rod.

[0006] The testing tool for detecting the installation accuracy of the steel belt and steel pulley in this embodiment of the application can measure the included angle between the side of the steel belt and the axis of the steel pulley, thereby obtaining the actual installation accuracy of the steel belt and steel pulley. In this way, if the installation accuracy is poor, the steel belt and / or steel pulley can be adjusted in time to improve the installation accuracy of the steel belt and steel pulley, which is beneficial to improving the service life and operational safety of the steel belt elevator.

[0007] In some embodiments, the scale plate is a semi-circular plate, and the length of the measuring rod is greater than the radius of the scale plate.

[0008] The scale plate is semi-circular, allowing the angle markings to cover a range from 0° to 180°, thus enabling the testing tool to measure angles from 0° to 180°. Furthermore, the length of the measuring rod is greater than the radius of the scale plate, resulting in a portion of the measuring rod overlapping the scale plate, with another portion extending beyond its boundaries. During the inspection of the installation accuracy of the steel belt and pulley, the portion of the measuring rod extending beyond the scale plate is not obstructed by the scale plate, allowing for easier observation and facilitating precise adjustment of the measuring rod to be parallel to the side of the steel belt, leading to more accurate test results.

[0009] In some embodiments, the length of the measuring rod is greater than or equal to twice the radius of the scale plate.

[0010] This configuration ensures that the measuring rod extends sufficiently beyond the scale plate. This allows for more precise adjustment of the measuring rod to be parallel to the side of the steel belt during the inspection of the installation accuracy of the steel belt and pulley, resulting in more accurate inspection results.

[0011] In some embodiments, the scale plate is a transparent plate.

[0012] Therefore, the inspector can see the steel strip through the scale plate. This allows the overlapping portion of the measuring rod and the scale plate to be used for alignment with the side of the steel strip. In other words, both the portion of the measuring rod extending beyond the scale plate and the overlapping portion can be used for alignment with the side of the steel strip. This results in a relatively long section of the measuring rod used for alignment with the side of the steel strip, thereby improving the accuracy of the parallelism between the measuring rod and the side of the steel strip, and ultimately enhancing the accuracy of the test results.

[0013] In some embodiments, the scale plate is a transparent plate, and the detection tool further includes a first light-emitting strip, which is fixedly connected to the edge region of the scale plate. The first light-emitting strip includes a plurality of first LEDs that are circumferentially spaced along the scale plate.

[0014] When the scale plate is transparent, the portion of the measuring rod extending beyond the scale plate and the portion overlapping with the scale plate can be aligned with the side of the steel strip. This improves the accuracy of the parallelism between the measuring rod and the side of the steel strip, thereby enhancing the accuracy of the test results. Furthermore, the testing tool is equipped with a first luminous strip, comprising multiple first LEDs spaced circumferentially along the scale plate. During the inspection of the installation accuracy of the steel strip and pulley, the first LEDs illuminate the scale plate, ensuring that the inspector can clearly see the angle scale lines, thus facilitating angle reading during the inspection process.

[0015] In some embodiments, the first light-emitting strip and the measuring rod are located on opposite sides of the scale plate along its own thickness direction, and the light-emitting surface of the first LED is disposed facing the scale plate.

[0016] This ensures that the light emitted by the first LED can cover the area where the angle scale lines are located, thus ensuring that the testing personnel can clearly see the angle scale lines on the scale plate.

[0017] In some embodiments, the detection tool further includes a second light-emitting strip, which is fixedly connected to the positioning rod, and the second light-emitting strip includes a plurality of second LEDs arranged at intervals along the length direction of the positioning rod.

[0018] The second light-emitting strip provides illumination, allowing for quicker location of the slot on the steel pulley during the installation of the positioning rod and the pulley, thus enabling the positioning rod to engage quickly. Furthermore, the illumination from the second light-emitting strip allows the inspector to clearly observe the connection point between the measuring rod and the positioning rod, facilitating adjustments to the positioning rod's position to ensure alignment between the connection point and the side edge of the steel belt.

[0019] In some embodiments, the measuring rod has a first side and a second side disposed opposite to each other along its own width direction, and the measuring rod is connected to the positioning rod via a pivot, wherein the extended surface of the first side passes through the axis of the pivot.

[0020] This configuration allows the first side of the measuring rod to serve as the measuring surface. When inspecting the installation accuracy of the steel belt and the steel belt pulley, the measuring rod can be visually adjusted until the first side completely overlaps with the side of the steel belt. At this point, it can be determined that the measuring rod and the side of the steel belt are overlapped. In this state, the angle value indicated by the angle scale line on the first side is read, which is the angle between the side of the steel belt and the axis of the steel belt pulley.

[0021] In some embodiments, the detection tool further includes a level, which is fixed to the positioning rod.

[0022] A level fixed to the positioning rod can also be used to detect the angle between the axis of the steel pulley and the horizontal plane, thereby determining whether the steel pulley itself meets the installation requirements.

[0023] In some embodiments, the positioning rod has a connecting groove that extends along the length of the positioning rod, and the level is mounted to the connecting groove by fasteners.

[0024] The positioning rod has a connecting groove extending along its length. The level is mounted in the connecting groove by fasteners. This allows the mounting position of the level on the positioning rod to be adjusted, so that the testing tool can be adapted to different steel pulleys, ensuring that the level does not interfere with the rim of the steel pulley.

[0025] In some embodiments, the positioning rod contains a magnetic material.

[0026] In this way, when the positioning rod engages with the groove on the rim of the steel pulley, the magnetic attraction between the positioning rod and the steel pulley can keep the positioning rod in a stable position relative to the steel pulley. This can prevent the positioning rod from shifting during the testing process, thus improving the accuracy of the test results.

[0027] In some embodiments, the length of the measuring rod is less than or equal to half the length of the positioning rod, the measuring rod is provided with a connecting buckle, and the positioning rod is provided with a mating part adapted to the connecting buckle.

[0028] The length of the measuring rod is less than or half the length of the positioning rod, and the measuring rod is equipped with a connecting buckle. The positioning rod is equipped with a mating part that matches the connecting buckle. This allows the measuring rod and the positioning rod to be folded together when the testing tool is not in use. The measuring rod and the positioning rod are kept in a folded state by the cooperation between the connecting buckle and the mating part. This makes the testing tool easy to store, carry and transport. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of a detection tool provided in one embodiment of this application; Figure 2 for Figure 1 Schematic sectional view along the middle AA direction; Figure 3 This is a schematic diagram of the assembly of the steel belt and the steel belt pulley; Figure 4 This is a schematic diagram of the detection tool in use in the embodiments of this application; Figure 5 A schematic diagram of the detection tool provided in one embodiment of this application from another perspective; Figure 6 This is a schematic diagram showing the installation of the steel belt and two adjacent steel belt pulleys.

[0031] Explanation of icon numbers: 10. Testing tool; 20. Steel belt; 21. Side; 30. Steel belt pulley; 31. Rim; 32. Slot; 100. Positioning rod; 101. Connecting groove; 102. Mating part; 200. Measuring rod; 201. First side; 202. Second side; 203. Connecting buckle; 300. Scale plate; 400. First light-emitting strip; 401. First LED light; 500, Second light-emitting strip; 501, Second LED light; 600, Shaft; 700. Level; 705. Fastener.

[0032] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0033] The technical solutions in this application will be clearly and thoroughly described below with reference to the accompanying drawings. In the description of the embodiments of this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B. "And / or" in the text is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more than two.

[0034] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0035] like Figure 1 , Figure 2 , Figure 3 as well as Figure 4As shown in the embodiment of this application, a testing tool 10 for detecting the installation accuracy of a steel belt and a steel belt pulley is provided. The rim 31 of the steel belt pulley 30 is provided with at least a pair of slots 32, and the line connecting the centers of the pair of slots 32 is parallel to the axis of the steel belt pulley 30. The testing tool 10 includes a positioning rod 100, a measuring rod 200, and a scale plate 300. The positioning rod 100 is configured to be engaged in the pair of slots 32 and can move along the axis of the steel belt pulley 30. One end of the measuring rod 200 is hinged to the middle of the positioning rod 100. The scale plate 300 is connected to the positioning rod 100 and is provided with angle scale lines, which are used to indicate the angle value between the measuring rod 200 and the positioning rod 100.

[0036] Specifically, the use of the testing tool 10 requires the following prerequisites: the rim 31 of the steel pulley 30 must have at least one pair of slots 32, and the line connecting the centers of the pair of slots 32 must be parallel to the axis of the steel pulley 30. Therefore, at least one pair of slots 32 meeting the above conditions can be pre-machined on the rim 31 of the steel pulley 30 before the elevator is installed.

[0037] The positioning rod 100 of the testing tool 10 is used to install with the steel pulley 30 and establish a measurement reference. When the positioning rod 100 is engaged in a pair of slots 32 on the steel pulley 30, the length direction of the positioning rod 100 is parallel to the axis of the steel pulley 30. Preferably, there are four pairs of slots 32 on the rim 31. On a single rim 31, the angular interval between two adjacent slots 32 is preferably 90°. This way, during measurement, there is no need to deliberately adjust the angle of the steel pulley 30; simply select the pair of slots 32 facing the inspector to install the positioning rod 100, making the testing process more convenient.

[0038] The measuring rod and scale plate 300 are used together to obtain the angle between the side 21 of the steel belt 20 and the axis of the steel pulley 30. Typically, manufacturers require the steel belt 20 and steel pulley 30 to have an angle of 90° between the side 21 of the steel belt 20 and the axis of the steel pulley 30. Using the aforementioned measuring tool 10, the angle between the side 21 of the steel belt 20 and the axis of the steel pulley 30 can be measured to determine the actual installation accuracy of the steel belt 20 and steel pulley 30. Specifically, after the positioning rod 100 is engaged in the slot 32, the positioning rod 100 can be moved along its length so that the connection point between the measuring rod 200 and the positioning rod 100 is aligned with the side 21 of the steel belt 20. Then, the position of the detection rod is adjusted by rotating the detection rod so that the detection rod is parallel to the side 21 of the steel belt 20. At this time, the angle between the detection rod and the positioning rod 100 is read through the scale plate 300, which is the angle between the side 21 of the steel belt 20 and the axis of the steel belt pulley 30.

[0039] If the angle between the measured side 21 of the steel belt 20 and the axis of the steel pulley 30 is 90°, it indicates that the installation accuracy is high. If the measured angle between the measured side 21 of the steel belt 20 and the axis of the steel pulley 30 is not 90°, it indicates that the installation accuracy is poor, and the steel belt 20 and / or the steel pulley 30 need to be adjusted to improve the installation accuracy.

[0040] In summary, the testing tool 10 used in this embodiment to detect the installation accuracy of the steel belt 20 and the steel pulley 30 can measure the included angle between the side 21 of the steel belt 20 and the axis of the steel pulley 30, thereby obtaining the actual installation accuracy of the steel belt 20 and the steel pulley 30. In this way, if the installation accuracy is poor, the steel belt 20 and / or the steel pulley 30 can be adjusted in time to improve the installation accuracy of the steel belt 20 and the steel pulley 30, which is beneficial to improving the service life and operational safety of the steel belt 20 elevator.

[0041] like Figure 1 As shown, in some embodiments, the scale plate 300 is a semi-circular plate, and the length of the measuring rod 200 is greater than the radius of the scale plate 300. The semi-circular design of the scale plate 300 allows the angle scale lines on it to cover a range from 0° to 180°, thus enabling the testing tool 10 to measure angles from 0° to 180°. Furthermore, the length of the measuring rod 200 is greater than the radius of the scale plate 300, resulting in a portion of the measuring rod 200 overlapping with the scale plate 300, and another portion extending beyond the scale plate 300. During the inspection of the installation accuracy of the steel belt 20 and the steel pulley 30, the portion of the measuring rod 200 extending beyond the scale plate 300 is not obstructed by the scale plate 300, allowing for easier observation and facilitating more precise adjustment of the measuring rod 200 to be parallel to the side 21 of the steel belt 20, thereby obtaining more accurate test results.

[0042] like Figure 1 As shown, in one embodiment, the length of the measuring rod 200 is greater than or equal to twice the radius of the scale plate 300. This arrangement ensures that the portion of the measuring rod 200 extending beyond the scale plate 300 has sufficient length. This allows for more precise adjustment of the measuring rod 200 to a state parallel to the side 21 of the steel belt 20 during the inspection of the installation accuracy of the steel belt 20 and the steel pulley 30, thereby obtaining more accurate inspection results.

[0043] In one embodiment, the scale plate 300 is transparent. This allows the inspector to see the steel strip 20 through the scale plate 300, enabling the overlapping portion of the measuring rod 200 with the scale plate 300 to be aligned with the side 21 of the steel strip 20. In other words, both the portion of the measuring rod 200 extending beyond the scale plate 300 and the overlapping portion can be used for alignment with the side 21 of the steel strip 20. This results in a relatively long length of the portion of the measuring rod 200 used for alignment with the side 21 of the steel strip 20, thereby improving the accuracy of the parallelism between the measuring rod 200 and the side 21 of the steel strip 20, and ultimately enhancing the accuracy of the inspection results.

[0044] like Figure 5 As shown, in some embodiments, the scale plate 300 is a transparent plate, and the detection tool 10 also includes a first light-emitting strip 400, which is fixedly connected to the edge area of ​​the scale plate 300. The first light-emitting strip 400 includes a plurality of first LED lights 401 distributed circumferentially along the scale plate 300.

[0045] When the scale plate 300 is transparent, the portion of the measuring rod 200 extending beyond the scale plate 300 and the portion overlapping with the scale plate 300 can be aligned with the side 21 of the steel strip 20. This improves the accuracy of the parallelism between the measuring rod 200 and the side 21 of the steel strip 20, thereby enhancing the accuracy of the test results. Furthermore, the testing tool 10 is equipped with a first luminous strip 400, which includes multiple first LED lights 401 spaced circumferentially along the scale plate 300. During the testing of the installation accuracy of the steel strip 20 and the steel pulley 30, the first LED lights 401 illuminate the scale plate 300, ensuring that the testing personnel can clearly see the angle scale lines on the scale plate 300, thus facilitating the angle reading process during testing.

[0046] like Figure 5 As shown, in one embodiment, the first light-emitting strip 400 and the measuring rod 200 are located on opposite sides of the scale plate 300 along its thickness direction, and the light-emitting surface of the first LED lamp 401 is positioned facing the scale plate 300. This ensures that the light emitted by the first LED lamp 401 can cover the area where the angle scale lines are located, thereby ensuring that the testing personnel can clearly see the angle scale lines on the scale plate 300.

[0047] like Figure 5 As shown, in some embodiments, the detection tool 10 further includes a second light-emitting strip 500, which is fixedly connected to the positioning rod 100. The second light-emitting strip 500 includes a plurality of second LED lights 501 arranged at intervals along the length direction of the positioning rod 100.

[0048] The second luminous strip 500 provides illumination, allowing for quicker location of the slot 32 on the steel pulley 30 during the installation of the positioning rod 100 and the steel pulley 30. This facilitates the quick engagement of the positioning rod 100 into the slot 32. Furthermore, the illumination from the second luminous strip 500 allows the inspector to clearly observe the connection point between the measuring rod and the positioning rod 100. This facilitates positional adjustments of the positioning rod 100 to ensure alignment between the connection point of the measuring rod 200 and the positioning rod 100 and the side 21 of the steel belt 20.

[0049] like Figure 1 , Figure 4 As shown, in some embodiments, the measuring rod 200 has a first side 201 and a second side 202 arranged opposite to each other along its own width direction. The measuring rod 200 is connected to the positioning rod 100 via a pivot 600, and the connection position has a central axis. The measuring rod 200 is rotatable relative to the positioning rod 100 about the central axis. The extended surface of the first side 201 passes through the axis of the pivot 600.

[0050] This configuration allows the first side 201 of the measuring rod 200 to serve as a measuring surface. When inspecting the installation accuracy of the steel belt 20 and the steel pulley 30, the measuring rod 200 can be visually adjusted until the first side 201 and the side 21 of the steel belt 20 are completely overlapped. At this point, it can be determined that the measuring rod 200 and the side 21 of the steel belt 20 are overlapped. In this state, the angle value indicated by the angle scale line where the first side 201 is located is read, which is the included angle between the side 21 of the steel belt 20 and the axis of the steel pulley 30.

[0051] like Figure 1 , Figure 4 As shown, in some embodiments, the detection tool 10 further includes a level 700, which is fixed to the positioning rod 100. During installation of the steel belt 20 elevator, the axis of the steel belt pulley 30 is required to be horizontal in space. Therefore, the level 700 fixed to the positioning rod 100 can also detect the angle between the axis of the steel belt pulley 30 and the horizontal plane, thereby determining whether the steel belt pulley 30 itself meets the installation requirements.

[0052] like Figure 1 , Figure 2 As shown, in one embodiment, the positioning rod 100 is formed with a connecting groove 101, which extends along the length of the positioning rod 100, and the level 700 is mounted in the connecting groove 101 by fasteners 705.

[0053] For example, fastener 705 may be a screw.

[0054] The positioning rod 100 has a connecting groove 101 extending along its own length. The level 700 is mounted in the connecting groove 101 by fasteners 705. This allows the mounting position of the level 700 on the positioning rod 100 to be adjusted, so that the testing tool 10 can adapt to different steel pulleys 30, ensuring that the level 700 will not interfere with the rim 31 of the steel pulley 30.

[0055] Specifically, when the positioning rod 100 is adjusted so that the connection point between the measuring rod 200 and the positioning rod 100 is aligned with the side 21 of the steel belt 20, if the level 700 interferes with the rim 31 of the steel belt pulley 30, the interference can be avoided by adjusting the installation position of the level 700 on the positioning rod 100.

[0056] In some embodiments, the positioning rod 100 contains a magnetic material. Thus, when the positioning rod 100 engages with the slot 32 on the rim 31 of the steel pulley 30, the magnetic attraction between the positioning rod 100 and the steel pulley 30 keeps the positioning rod 100 in a stable position relative to the steel pulley 30. This prevents the positioning rod 100 from shifting during the testing process, thereby improving the accuracy of the test results.

[0057] like Figure 1 As shown, in some embodiments, the length of the measuring rod 200 is less than or equal to half the length of the positioning rod 100, the measuring rod 200 is provided with a connecting buckle 203, and the positioning rod 100 is provided with a mating part 102 adapted to the connecting buckle 203.

[0058] For example, the connecting buckle 203 can be a snap fastener, and the mating part 102 can be a slot 32 adapted to the snap fastener. Alternatively, the connecting buckle 203 can be a magnetic buckle, and the mating part 102 can be a magnet or iron block that can attract the magnetic buckle.

[0059] The length of the measuring rod 200 is less than or half the length of the positioning rod 100, and the measuring rod 200 is provided with a connecting buckle 203. The positioning rod 100 is provided with a mating part 102 that is adapted to the connecting buckle 203. This allows the measuring rod 200 and the positioning rod 100 to be folded together when the testing tool 10 is not in use. The measuring rod 200 and the positioning rod 100 are kept in a folded state by the cooperation between the connecting buckle 203 and the mating part 102. This makes the testing tool 10 easy to store and carry.

[0060] The testing tool 10 in this application for detecting the installation accuracy of the steel belt 20 and the steel pulley 30 can be used not only to detect the installation accuracy between the steel belt 20 and a single steel pulley 30, but also to detect the parallelism between adjacent steel pulleys 30. Specifically, the included angle α between one side 21 of the steel belt 20 and the axis of the first steel pulley 30, and the included angle β between the other side 21 of the steel belt 20 and the axis of the second steel pulley 30 can be measured respectively, thereby obtaining the parallelism γ between the first steel pulley 30 and the second steel pulley 30, where γ = 180 - α - β. During elevator installation, after the steel belt 20 and each steel pulley 30 are installed, the parallelism of adjacent steel pulleys 30 can be tested. If the test result shows that γ is not equal to 0°, the cause of the non-0° parallelism needs to be investigated, and various factors affecting parallelism need to be adjusted. These adjustments include adjusting the position of the fixing point at the end of the steel belt 20, adjusting the elevator car configuration, and adjusting the installation angle between the steel belt 20 and each individual steel pulley 30, until γ equals 0°. Therefore, the testing tool 10 can be used to test and calibrate the parallelism between adjacent steel pulleys 30, allowing inspectors to promptly obtain installation accuracy information during installation and make timely adjustments based on the installation status, thereby improving the installation quality of the steel belt elevator.

[0061] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A testing tool for detecting the installation accuracy of a steel belt and a steel belt pulley, wherein the rim of the steel belt pulley is provided with at least one pair of grooves, and the line connecting the centers of the pair of grooves is parallel to the axis of the steel belt pulley, characterized in that, The detection tools include: A positioning rod, the positioning rod being configured to engage in a pair of said slots and being movable along the axial direction of said steel pulley; A measuring rod, one end of which is hinged to the middle of the positioning rod; A scale plate is connected to the positioning rod. The scale plate is provided with angle scale lines, which are used to indicate the angle value between the measuring rod and the positioning rod.

2. The detection tool according to claim 1, characterized in that, The scale plate is a semi-circular plate, and the length of the measuring rod is greater than the radius of the scale plate.

3. The detection tool according to claim 2, characterized in that, The length of the measuring rod is greater than or equal to twice the radius of the scale plate.

4. The detection tool according to claim 3, characterized in that, The scale plate is a transparent plate.

5. The detection tool according to claim 1, characterized in that, The scale plate is a transparent plate, and the detection tool also includes a first light-emitting strip, which is fixedly connected to the edge area of ​​the scale plate. The first light-emitting strip includes a plurality of first LED lights that are distributed circumferentially along the scale plate.

6. The detection tool according to claim 5, characterized in that, The first light-emitting strip and the measuring rod are located on opposite sides of the scale plate along its own thickness direction, and the light-emitting surface of the first LED lamp is set towards the scale plate.

7. The detection tool according to any one of claims 1 to 6, characterized in that, The detection tool also includes a second light-emitting strip, which is fixedly connected to the positioning rod. The second light-emitting strip includes a plurality of second LED lights arranged at intervals along the length of the positioning rod.

8. The detection tool according to any one of claims 1 to 6, characterized in that, The measuring rod has a first side and a second side that are arranged opposite to each other along its own width direction, and the measuring rod is connected to the positioning rod via a rotating shaft; The extended surface of the first side passes through the axis of the rotating shaft.

9. The detection tool according to any one of claims 1 to 6, characterized in that, The testing tool also includes a level, which is fixed to the positioning rod.

10. The detection tool according to claim 9, characterized in that, The positioning rod has a connecting groove that extends along the length of the positioning rod, and the level is mounted to the connecting groove by fasteners.

11. The detection tool according to any one of claims 1 to 6, characterized in that, The positioning rod contains magnetic material.

12. The detection tool according to any one of claims 1 to 6, characterized in that, The length of the measuring rod is less than or equal to 1 / 2 of the length of the positioning rod. The measuring rod is provided with a connecting buckle, and the positioning rod is provided with a mating part that is adapted to the connecting buckle.

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