measuring device

Abstract

The present disclosure provides a measuring device, which includes a base, a sensing unit, a shaft body and a seal. The base is adapted to be fixed on a support. The sensing unit includes a housing and a laser sensing module and / or a graphic sensing module housed at least partially in the housing, the housing being provided with a shaft hole. The shaft body partially extends into the housing through the shaft hole, and the sensing unit is supported on the base by the shaft body. The shaft body is driven to rotate the sensing unit about an axis of the shaft body relative to the base. The seal is sleeved on the shaft body and located between an inner periphery of the shaft hole and an outer periphery of the shaft body. At least part of the seal is fitted to a surface of the inner periphery of the shaft hole. The seal reduces the risk of contaminants penetrating into the interior of the sensing unit.

Description

Technical Field

[0001] This disclosure relates to the field of measurement technology, and in particular, to a measuring device. Background Technology

[0002] Measuring equipment is a device that enables remote video monitoring and image displacement measurement. It can be used for video surveillance and displacement measurement in scenarios such as subways, railways, bridges, and dams. Measuring equipment typically consists of a sensing unit and a base. The sensing unit is supported on the base by a shaft, and both the sensing unit and the shaft can rotate relative to the base around the axis of the shaft to achieve a wider measurement angle. However, sealing the junction between the sensing unit and the shaft is challenging, posing a risk that dust, liquids, and other contaminants may seep into the sensing unit through this junction and damage the measuring equipment. Utility Model Content

[0003] In view of this, the present disclosure provides a measuring device that improves the structure of the junction between the sensing unit and the shaft to reduce the risk of dust, liquid and other contaminants penetrating into the sensing unit through the junction between the sensing unit and the shaft and damaging the measuring device.

[0004] The measuring device includes a base, a sensing unit, a shaft, and a seal. The base is adapted to be fixed to a support. The sensing unit includes a housing and a laser sensing module and / or a pattern sensing module at least partially housed within the housing, the housing having a shaft hole. The shaft extends partially into the housing through the shaft hole, and the sensing unit is supported on the base by the shaft. The shaft is driven to rotate the sensing unit relative to the base about the axis of the shaft. The seal is fitted onto the shaft and located between the inner circumference of the shaft hole and the outer circumference of the shaft. At least a portion of the seal conforms to the surface of the inner circumference of the shaft hole.

[0005] In one embodiment, the outer periphery of the seal is provided with a first groove, the inner periphery of the housing defining the shaft hole is provided in the first groove, and the inner surface of the first groove is at least partially in contact with the surface of the inner periphery of the shaft hole.

[0006] In one embodiment, a second groove is provided on the outer peripheral surface of the shaft, and the seal includes a base, which is at least partially located in the second groove, and the inner surface of the second groove is at least partially attached to the outer surface of the base.

[0007] In one embodiment, the seal also includes two flanges that extend radially outward from the base beyond the second groove and are axially spaced from each other, defining a first groove between them.

[0008] In one implementation, the thickness of each flange gradually increases from its top to its bottom.

[0009] In one implementation, each flange has an outer surface on the side facing away from the other flange, and the outer surface is a smooth curved surface that bulges outward.

[0010] In one implementation, the bottom surface of each flange is located outside the second groove and fits against the outer peripheral surface of the shaft.

[0011] In one embodiment, the side of the flange facing away from the other flange has an outer surface, and a first chamfer is provided between the outer surface and the bottom surface.

[0012] As one implementation, a second chamfered portion is provided between the bottom surface and the side surface of the base.

[0013] In one embodiment, a third chamfer is provided at the corner of the first groove.

[0014] In one embodiment, a second chamfered portion is provided between the bottom surface and the side of the base, and a third chamfered portion is provided at the corner of the first groove.

[0015] In one embodiment, a fourth chamfered portion is provided between the side surface of the base and the bottom surface of the base.

[0016] In one implementation, the base fills the second groove.

[0017] According to an embodiment of this disclosure, a seal is fitted onto the shaft and located between the inner circumference of the shaft bore and the outer circumference of the shaft. At least a portion of the seal conforms to the surface of the inner circumference of the shaft bore, reducing the risk of contaminants penetrating into the sensing unit. Attached Figure Description

[0018] It should be understood that the following figures only illustrate certain embodiments of this disclosure and should not be construed as limiting the scope.

[0019] It should be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0020] It should be understood that the accompanying drawings are only schematic, and the dimensions and scales of the elements in the drawings are not necessarily precise.

[0021] Figure 1 This is a schematic diagram of the structure of a measuring device according to an embodiment of the present disclosure.

[0022] Figure 2 for Figure 1 A schematic diagram of the sensing unit, shaft, and seal of the measuring device.

[0023] Figure 3 for Figure 1 A schematic diagram of the sensing unit of the measuring device.

[0024] Figure 4 For along Figure 2 A schematic cross-sectional view taken along line AA.

[0025] Figure 5 It shows Figure 4 A magnified view of part B in the diagram.

[0026] Figure 6 It shows Figure 5 A schematic diagram of the decomposition of part B in the diagram.

[0027] Explanation of reference numerals in the attached drawings: 100, measuring device; 10, base; 20, sensing unit; 21, chamber; 22, shaft hole; 221, inner periphery of the shaft hole; 222, inner surface of the shaft hole; 30, shaft body; 31, second groove; 311, bottom wall of the second groove; 312, side wall of the second groove; 40, seal; 41, first groove; 411, bottom wall of the first groove; 412, side wall of the first groove; 42, base; 421, upper surface of the base; 422, bottom surface of the base; 423, side surface of the base; 43, flange; 431, outer surface of the flange; 432, bottom surface of the flange; 44, connecting part; 45, first chamfered part; 46, second chamfered part; 47, third chamfered part; 48, fourth chamfered part. Detailed Implementation

[0028] The following will illustrate this solution provided in conjunction with specific embodiments and accompanying drawings.

[0029] Numerous specific details are set forth below to provide an understanding of the structure, function, and use of the embodiments described and illustrated in the specification and figures. It is to be understood that the embodiments described and illustrated herein are non-limiting examples, and thus it will be appreciated that the particular structural and functional details disclosed herein are representative and exemplary. Variations and changes may be made to these embodiments without departing from the scope of the claims.

[0030] This disclosure provides a measuring device 100. For ease of understanding, the overall structure of the measuring device 100 according to this disclosure will be described below by way of example. It should be understood that the structure of the measuring device 100 is not limited to the following description. For example, one or more elements mentioned below may be omitted or replaced, and their layout relationships may be changed.

[0031] refer to Figure 1The measuring device 100 may include a base 10 and a sensing unit 20. The base 10 is adapted to be fixed to a support. The measuring device 100 can be installed at a predetermined position via the base 10, so that the object to be measured is within the measuring range of the measuring device 100. In some applications, the object to be measured may be a subway, railway, or bridge, and the support may be a building surrounding the object to be measured. One end of the base 10, such as the bottom end, may be fixed to the support. The other end of the base 10, such as the top end, may support the sensing unit 20.

[0032] The sensing unit 20 includes a housing 21 and a laser sensing module and / or an image sensing module (not shown) at least partially housed within the housing 21. By way of example only, the laser sensing module may be a laser rangefinder. By way of example only, the image sensing module may be a device for acquiring images or videos. The laser sensing module and the image sensing module can be housed within the housing 21. The housing 21 isolates the laser sensing module and the image sensing module from the external environment, preventing them from being damaged by external contaminants.

[0033] refer to Figures 1-3 The housing 21 has a shaft hole 22, through which a shaft 30 extends partially into the housing 21. The sensing unit 20 is supported on the base 10 via the shaft 30. The shaft 30 is driven, causing the sensing unit 20 to rotate relative to the base 10 around its axis. One end of the shaft 30 is rotatably connected to the base 10. A drive device can be installed inside the base 10. The drive device can be a torque output device, such as an electric motor. The drive device can drive the shaft 30 to rotate around its axis. The transmission method between the drive device and the shaft 30 includes, but is not limited to, gear transmission, belt transmission, and chain transmission. The other end of the shaft 30 extending into the housing 21 through the shaft hole 22 can be fixedly connected to the laser sensing module and / or the image sensing module. There can be two shafts 30, respectively located on both sides of the laser sensing module and / or the image sensing module. Alternatively, there can be one shaft 30, with both ends rotatably connected to the base 10. The laser sensing module and / or the image sensing module can be fixedly connected to the housing 21. Thus, the shaft 30 can drive the sensing unit 20 to rotate relative to the base 10 around the axis of the shaft 30, allowing the sensing unit 20 to have a larger field of view, i.e., a larger measurement range. The cross-sectional shape of the shaft 30 in a plane perpendicular to the axis includes, but is not limited to, circles, rectangles, and polygons.

[0034] refer to Figure 2 and Figure 4The seal 40 is fitted onto the shaft 30 and located between the inner circumference of the shaft hole 22 and the outer circumference of the shaft 30. The seal 40 may be elastic, for example, made of synthetic or natural rubber, to seal the joint between the housing 21 and the shaft 30, preventing contamination or even damage to the laser sensing module and / or image sensing module inside the housing 21 due to external contaminants entering the housing 21.

[0035] For ease of understanding, the axial direction of the shaft 30 is indicated by arrow x in the accompanying drawings of this disclosure. Additionally, the thickness direction (axial) and height direction (radial), which will be mentioned below, are also indicated by arrow x and arrow y, respectively, in the accompanying drawings.

[0036] The inventors discovered that because the measuring device 100 is exposed to harsh outdoor environments for extended periods, the seal 40 is prone to aging and deformation, such as cracking and warping. These harsh environments can also lead to minute gaps between the housing 21 and the shaft 30. These gaps can create leakage paths, allowing contaminants such as liquids to enter the housing 21. Furthermore, the sensing unit 20 is frequently in motion, such as rotating relative to the base 10. This can cause the housing 21 and shaft 30 to move around, potentially causing the housing 21 to lose contact with the seal 40 and resulting in seal failure.

[0037] To address the above issues, refer to Figure 5 and Figure 6 The present disclosure provides a first groove 41 on the outer periphery of the seal 40, and the inner peripheral edge 221 of the housing 21 defining the shaft hole is disposed within the first groove 41. The inner surface of the first groove 41 at least partially conforms to the surface of the inner peripheral edge 221 of the shaft hole. The outer periphery of the seal 40 refers to the circumferential direction of the seal 40 away from the shaft 30. The inner peripheral edge 221 of the shaft hole refers to the edge portion of the inner surface 222 of the shaft hole. The surface of the inner peripheral edge 221 of the shaft hole includes the inner surface 222 of the shaft hole and the surface surrounding the inner peripheral edge 221 of the shaft hole, that is, a portion of the inner surface and a portion of the outer surface of the housing 21. For example, the inner surface 222 of the shaft hole can conform to the bottom wall 411 of the first groove; a portion of the inner surface and a portion of the outer surface of the housing 21 can respectively conform to the two side walls 412 of the first groove 41. Thus, there is a large contact area between the housing 21 and the seal 40, extending the leakage path between the seal 40 and the housing 21. Meanwhile, the two sidewalls 412 of the first groove 41 can restrict the displacement of the chamber 21 in the thickness direction (x direction), so that the chamber 21 is kept in a predetermined position and prevents the chamber 21 from detaching from the seal 40. In addition, when the chamber 21 is installed on the seal 40, the first groove 41 can play a positioning role to avoid assembly errors between the chamber 21 and the seal 40.

[0038] In the above embodiments, on the one hand, the first groove 41 increases the contact area between the seal 40 and the housing 21, extending the leakage path between the seal 40 and the housing 21, thereby reducing the risk of contaminants penetrating into the sensing unit 20. On the other hand, the first groove 41 on the outer periphery of the seal 40 can keep the housing 21 in a predetermined position, preventing the housing 21 from detaching from the seal 40 and causing sealing failure. Furthermore, the first groove 41 on the outer periphery of the seal 40 can avoid assembly errors between the housing 21 and the seal 40, facilitating the installation of the housing 21 into a preset position.

[0039] Further, refer to Figure 5 and Figure 6 The present disclosure provides a second groove 31 on the outer peripheral surface of the shaft 30. The seal 40 includes a base 42, which is at least partially located within the second groove 31, and the inner surface of the second groove 31 is at least partially attached to the outer surface of the base 42. The base 42 of the seal 40 has an upper surface 421, a bottom surface 422, and two side surfaces 423. The upper surface 421 of the base may be the bottom wall 411 of the first groove. The bottom surface 422 of the base may be attached to the bottom wall 311 of the second groove. The two side surfaces 423 of the base 42 may respectively be attached to the side walls 312 of the second groove. Thus, there is a large contact area between the shaft 30 and the seal 40, which prolongs the leakage path between the seal 40 and the shaft 30, thereby reducing the risk of contaminants penetrating into the interior of the sensing unit 20. At the same time, the two side walls 312 of the second groove 31 can restrict the displacement of the seal 40 in the thickness direction, so that the seal 40 is held in a predetermined position. In addition, when the seal 40 is installed on the shaft 30, the second groove 31 can play a positioning role, avoiding assembly errors between the shaft 30 and the seal 40, and making it easier to install the seal 40 in the preset position.

[0040] The base 42 can be partially located within the second groove 31, meaning the height of the upper surface 421 of the base in the height direction (y-direction) can be higher than the outer peripheral surface of the shaft 30. In this case, the base 42 has a relatively high height and is partially located outside the second groove 31. However, an excessively high base 42 will have greater elasticity, causing the chamber 21 to easily shift in the thickness direction, and will also increase the manufacturing cost of the seal 40. Alternatively, the base 42 can be entirely located within the second groove 31; for example, the height of the upper surface 421 of the base in the height direction can be lower than the outer peripheral surface of the shaft 30. In this case, the chamber 21 can partially extend into the second groove 31, with the sidewall 412 of the first groove partially located between the sidewall 312 of the chamber 21 and the second groove. If the dimension of the second groove 31 in the thickness direction is only slightly larger than the thickness of the chamber 21, the sidewall 412 of the first groove will be very thin, making it easily damaged under the pressure of the chamber 21 and the shaft 30, affecting the sealing effect. To ensure that the sidewall 412 of the first groove has sufficient thickness, it is necessary to increase the dimension of the second groove 31 in the thickness direction or reduce the thickness of the chamber 21. Both of these methods require changes to the manufacturing process and increase manufacturing costs.

[0041] To address the aforementioned technical problem, namely, how to prevent the chamber 21 from shifting in the thickness direction while ensuring that the sidewall 412 of the first groove has sufficient thickness, refer to... Figure 5 and Figure 6 The base 42 of this disclosure fills the second groove 31. At this time, the upper surface 421 of the base is flush with the outer peripheral surface of the shaft 30 in the height direction. Thus, the base 42 is entirely located within the second groove 31, making it difficult for the chamber 21 to move in the thickness direction. At the same time, the sidewall 412 of the first groove is located outside the second groove 31, and its thickness is not limited by the chamber 21 and the second groove 31. It can have sufficient thickness to provide sufficient support to limit the displacement of the chamber 21 in the thickness direction. In addition, the thicker sidewall 412 of the first groove is not easily deformed, resulting in a better sealing effect.

[0042] refer to Figure 6A fourth chamfered portion 48 is provided between the side surface 423 and the bottom surface 422 of the base. The seal 40 is annular, and when the seal 40 is installed on the shaft 30, it can be fitted onto the shaft 30. By providing the fourth chamfered portion 48, this disclosure reduces the size of the side surface 423 of the base, thereby increasing the inner diameter of the outer side of the seal 40. The outer side refers to the plane where the side surface 423 of the base is located. The larger inner diameter of the outer side, combined with the slope of the fourth chamfered portion 48, makes it easier for the seal 40 to be fitted onto the shaft 30. After the seal 40 is fitted onto the shaft 30, it needs to slide on the shaft 30 to a designated position. During the sliding process, the bottom surface 422 of the base is in contact with the outer peripheral surface of the shaft 30. The angle between the fourth chamfered portion 48 and the bottom surface 422 of the base is an obtuse angle. Compared with a right angle, this obtuse angle makes the seal 40 slide more smoothly on the shaft 30 and less prone to jamming, thus making it easier to install the seal 40 into the designated position.

[0043] refer to Figure 5 The seal 40 also includes two flanges 43 that extend radially outward from the base 42 beyond the second groove 31, are axially spaced from each other, and define a first groove 41 between them. Radial outward is the positive y-axis direction in the figure, and axial direction is the x-axis direction. The two flanges 43 can extend radially outward from the upper surface 421 of the base beyond the second groove 31. The two flanges 43 can be axially spaced from each other, the distance of which can be the thickness of the chamber 21. The two flanges 43 can be formed as sidewalls 412 of the first groove. The inner surfaces of the flanges 43, i.e., the surfaces facing each other, can fit against the surface of the chamber 21. Since the two flanges 43 can extend beyond the second groove 31, both flanges 43 can be entirely located outside the second groove 31, or partially located outside the second groove 31. The thickness of the portion located outside the second groove 31 is not limited by the size of the second groove 31 or the thickness of the chamber 21. As mentioned earlier, the two flanges 43 can have sufficient thickness to provide adequate support and limit the displacement of the chamber 21 in the thickness direction. Simultaneously, thicker flanges 43 are less prone to deformation, resulting in a better sealing effect. Furthermore, the radial dimension of the flanges 43 can be set according to the sealing requirements of those skilled in the art. The larger the radial dimension of the flanges 43, the longer the leakage path between the chamber 21 and the seal 40, and the better the sealing effect.

[0044] refer to Figure 6The thickness of each flange 43 gradually increases from its top to its bottom, where the top refers to the portion of the flange 43 away from the shaft 30, and the bottom refers to the portion of the flange 43 close to the outer peripheral surface of the shaft 30. In other words, the flange 43 is narrower at the top and wider at the bottom. The top of the flange 43 can have an appropriate thickness. If it is too narrow, the seal 40 is prone to deformation after aging. If it is too thick, it will waste material and increase costs. The thickness of the bottom can be greater than that of the top, so that the bottom is less prone to deformation when compressed by the chamber 21, and can provide support for the chamber 21.

[0045] refer to Figure 6 Each flange 43 has an outer surface 431 on the side facing away from the other flange 43. The outer surface 431 is a smooth, outwardly convex curved surface. The direction of the convexity of the outer surface 431 is away from the housing 21. The outwardly convex smooth curved surface makes the flange 43 tend to bend towards the housing 21 when it ages, so the flange 43 is less likely to deform in the direction away from the housing 21, which can reduce the risk of gaps between the seal 40 and the housing 21 and improve the sealing performance.

[0046] refer to Figure 5 and Figure 6 The bottom surface 432 of each flange is located outside the second groove 31 and is in contact with the outer peripheral surface of the shaft 30. When the flange 43 is squeezed by the chamber 21, the shaft 30 can provide a certain supporting force to the flange 43 to prevent the seal 40 from deforming. At the same time, the part of the bottom surface 432 of the flange that is in contact with the outer peripheral surface of the shaft 30 can further extend the leakage path between the seal 40 and the shaft 30, thereby improving the sealing performance.

[0047] refer to Figure 5 and Figure 6 One flange 43 has an outer surface 431 on the side facing away from the other flange 43, and a first chamfered portion 45 is provided between the outer surface 431 and the bottom surface 432. The angle between the first chamfered portion 45 and the bottom surface 432 of the flange is an obtuse angle. When the seal 40 ages, this obtuse angle structure makes the bottom surface 432 of the flange less prone to warping or curling. As a result, gaps are less likely to appear between the bottom surface 432 of the flange and the outer peripheral surface of the shaft 30, which can improve the sealing performance.

[0048] refer to Figure 5 and Figure 6A second chamfered portion 46 is provided between the bottom surface 432 of the flange and the side surface 423 of the base. If the bottom surface 432 of the flange and the side surface 423 of the base are perpendicular to each other and connected together, the thickness of the connection portion 44 between the flange 43 and the base 42 will be small, making it prone to breakage. The second chamfered portion 46 provided in this disclosure between the bottom surface 432 of the flange and the side surface 423 of the base can increase the thickness of the connection portion 44 between the flange 43 and the base 42 without changing the dimensions of the base 42 and the second groove 31, ensuring that the seal 40 is not easily damaged. Furthermore, a third chamfered portion 47 is provided at the corner of the first groove 41. The corner of the first groove 41 refers to the connection between the bottom wall 411 and the side wall 412 of the first groove. If the bottom wall 411 and the side wall 412 of the first groove are perpendicular to each other and connected together, the thickness of the connection portion 44 between the flange 43 and the base 42 will be small, making it prone to breakage. The third chamfered portion 47 provided between the bottom wall 411 and the side wall 412 of the first groove can increase the thickness of the connection portion 44 between the flange 43 and the base 42 without changing the size of the first groove 41 and the thickness of the chamber 21, thus ensuring that the seal 40 is not easily damaged.

[0049] It should be noted that the elements described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0050] It should also be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Similarly, "abutment" can refer to a direct abutment or an indirect abutment through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0051] It should be understood that multiple components and / or parts can be provided by a single integrated component or part. Alternatively, a single integrated component or part can be divided into multiple separate components and / or parts. The use of the public designation "a" or "an" to describe a component or part is not intended to exclude other components or parts.

[0052] It should be understood that although terms such as “first” or “second” may be used in this disclosure to describe various elements, these elements are not defined by these terms, which are only used to distinguish one element from another.

[0053] The basic principles of this disclosure have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this disclosure are merely examples and not limitations, and should not be considered as essential features of each embodiment of this disclosure. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the scope of this disclosure to the necessity of employing the aforementioned specific details for implementation.

[0054] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure 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 disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A measuring device, characterized in that, include: A base, the base being adapted to be fixed to a support; A sensing unit, the sensing unit including a housing and a laser sensing module and / or a pattern sensing module at least partially housed within the housing, the housing having an axial hole; A shaft extends partially into the chamber through the shaft hole. The sensing unit is supported on the base by the shaft. The shaft is driven to cause the sensing unit to rotate relative to the base about the axis of the shaft. as well as A seal is fitted onto the shaft body and located between the inner circumference of the shaft hole and the outer circumference of the shaft body, with at least a portion of the seal conforming to the surface of the inner circumference of the shaft hole.

2. The measuring device according to claim 1, characterized in that, The outer periphery of the seal is provided with a first groove, and the inner periphery of the shaft hole defined by the chamber body is provided in the first groove, and the inner surface of the first groove is at least partially in contact with the surface of the inner periphery of the shaft hole.

3. The measuring device according to claim 2, characterized in that, The outer circumferential surface of the shaft is provided with a second groove, and the seal includes a base, the base being at least partially located in the second groove, and the inner surface of the second groove being at least partially attached to the outer surface of the base.

4. The measuring device according to claim 3, characterized in that, The seal also includes two flanges that extend radially outward from the base beyond the second groove and are spaced apart from each other in the axial direction, defining the first groove between them.

5. The measuring device according to claim 4, characterized in that, The thickness of each flange gradually increases from its top to its bottom.

6. The measuring device according to claim 5, characterized in that, Each of the flanges has an outer surface on the side facing away from the other flange, the outer surface being a smooth, outwardly convex curved surface.

7. The measuring device according to claim 4, characterized in that, The bottom surface of each flange is located outside the second groove and is in contact with the outer peripheral surface of the shaft.

8. The measuring device according to claim 7, characterized in that, Each of the flanges has an outer surface on the side facing away from the other flange, and a first chamfer is provided between the outer surface and the bottom surface.

9. The measuring device according to claim 7, characterized in that, A second chamfered portion is provided between the bottom surface and the side surface of the base, and / or a third chamfered portion is provided at the corner of the first groove.

10. The measuring device according to claim 3, characterized in that, A fourth chamfer is provided between the side surface of the base and the bottom surface of the base.

11. The measuring device according to claim 3, characterized in that, The base fills the second groove.

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