Measuring device

Abstract

The present disclosure provides a measuring device, which comprises a base, a sensing unit and a driving assembly. The sensing unit is rotatably arranged on the base by a shaft body. The driving assembly is arranged in the base and drives the shaft body to rotate relative to the base around the axis of the shaft body. The driving assembly comprises a driving source, a worm and a worm wheel. The worm is engaged with the worm wheel and drives the worm wheel under the control of the driving source. The worm wheel is fixedly connected with the shaft body. The worm wheel comprises a first body, a second body and a biasing elastic member. The first body is coaxial with the shaft body and is fixedly connected with the shaft body. The second body is coaxial with the shaft body and is rotatably connected with the first body. The biasing elastic member is configured to apply an elastic force to the first body and the second body, so that the first worm tooth on the first body and the second worm tooth on the second body apply a force to the worm, thereby effectively increasing the contact area between the helical teeth on the worm wheel and the worm, and improving the load that the worm wheel can withstand.

Description

Technical Field

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

[0002] A measuring device is a tool 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. A measuring device typically includes a base, a sensing unit, and a drive assembly. The sensing unit can be supported on the base, and the drive assembly can drive the sensing unit to rotate relative to the base to achieve a larger measurement angle. However, during long-term use, the drive assembly is prone to a decrease in transmission accuracy due to wear or misalignment between its components. Utility Model Content

[0003] In view of this, the present disclosure provides a measuring device with an improved construction of the drive assembly to reduce the risk of decreased transmission accuracy due to wear or movement between its components.

[0004] The measuring device includes a base, a sensing unit, and a drive assembly. The sensing unit is rotatably mounted on the base via a shaft. The drive assembly is disposed within the base and drives the shaft to rotate, thereby causing the sensing unit to rotate relative to the base about the shaft's axis. The drive assembly includes a drive source, a worm, and a worm wheel. The drive source drives the worm. The worm meshes with the worm wheel and is controlled by the drive source to drive the worm wheel, which is fixedly connected to the shaft. The worm wheel includes a first body, a second body, and a biasing elastic element. The first body is coaxial with and fixedly connected to the shaft, and the second body is coaxial with the shaft and rotatably connected relative to the first body. The biasing elastic element is configured to apply an elastic force to the first and second bodies, causing the first worm teeth on the first body and the second worm teeth on the second body to exert a force on the worm.

[0005] In one embodiment, the meshing surface width of the first worm tooth of the first body is configured to be greater than or equal to the meshing surface width of the second worm tooth of the second body.

[0006] In one embodiment, the ratio between the meshing surface width of the first worm tooth of the first body and the meshing surface width of the second worm tooth of the second body is in the range of 1:1 to 4:1.

[0007] In one embodiment, on a longitudinal section perpendicular to the rotation axis of the worm gear, the projection of the rotation axis of the worm gear along the radial direction of the worm gear is located at the center of the worm gear surface.

[0008] In one embodiment, a first groove is provided on the side of the first body facing the second body, and a second groove is provided on the side of the second body facing the first body. The first groove and the second groove are used to jointly form a receiving cavity for accommodating the biased elastic element.

[0009] In one embodiment, a biasing elastic element is disposed in the receiving cavity, with one end fixedly connected to the first body and the other end fixedly connected to the second body. When the first body rotates relative to the second body in a first preset direction, the biasing elastic element is stretched. When the first body rotates relative to the second body in a second preset direction, the biasing elastic element is compressed. The second preset direction is opposite to the first preset direction.

[0010] In one embodiment, the biasing elastic element is pre-pressed into the receiving cavity, with one end abutting against the first body and the other end abutting against the second body. When the first body rotates relative to the second body in a preset direction, the biasing elastic element is compressed.

[0011] In one embodiment, on the side of the first body facing the second body, a third groove in an annular shape is provided on the circumferential outer side of the first groove.

[0012] In one embodiment, the drive assembly further includes a fixing member located on the side of the second body opposite to the first body and fixedly connected to the first body. The fixing member is at least partially attached to the side of the second body opposite to the first body to prevent the second body from moving in a direction opposite to the first body.

[0013] In one embodiment, the first body includes a first flange extending toward the side where the second body is located, the second body is sleeved on the first flange, the first flange is provided with a second flange, and the fastener is at least partially sleeved on the second flange. In the radial direction of the shaft, the fastener at least partially protrudes from the outer peripheral surface of the first flange.

[0014] According to embodiments of this disclosure, the first worm gear on the first body and the second worm gear on the second body can apply forces in the same direction to the worm, thereby effectively increasing the contact area between the worm wheel and the helical teeth on the worm, thus improving the load that the worm wheel can withstand. The first worm gear on the first body and the second worm gear on the second body can apply forces in opposite directions to the worm, and can mesh with the two sidewalls of the helical teeth on the worm wheel in opposite rotational directions. Even if wear or movement causes gaps between the first and second worm gears and the helical teeth, the first and second worm gears can eliminate these gaps under the action of the biasing elastic element, maintaining a close contact with the helical teeth. Therefore, when the helical teeth on the worm are driven to rotate, they can drive the first and second bodies to rotate synchronously, reducing the risk of decreased transmission accuracy of the drive assembly due to gaps between the worm gears and the helical teeth. Attached Figure Description

[0015] It should be understood that the following figures only illustrate certain embodiments of this disclosure and should not be construed as limiting the scope.

[0016] It should be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0017] 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.

[0018] Figure 1 This is a schematic diagram of a measuring device according to an embodiment of the present disclosure.

[0019] Figure 2 for Figure 1 A schematic diagram of the base, sensing unit, and driving components of the measuring device.

[0020] Figure 3 for Figure 1 A schematic diagram of the sensing unit, shaft, and drive assembly of the measuring device.

[0021] Figure 4 for Figure 1 An exploded view of the worm gear and shaft of the measuring device.

[0022] Figure 5 for Figure 1 A schematic diagram of the structure of the measuring device when the first and second worm teeth mesh with the helical teeth.

[0023] Figure 6 for Figure 1 A schematic diagram of the longitudinal section of the measuring device, perpendicular to the rotation axis of the worm gear and worm.

[0024] Figure 7 for Figure 1 A schematic diagram of the bias elastic element and the first main body of the measuring device.

[0025] Explanation of reference numerals in the attached drawings: 100, base; 200, sensing unit; 300, drive assembly; 30, drive source; 31, worm; 312, helical tooth; 32, worm wheel; 321, first body; 3211, first worm tooth; 3212, first groove; 3213, third groove; 3214, first flange; 3215, second flange; 3216, outer end face of the second flange; 322, second body; 3221, second worm tooth; 3222, second groove; 323, biasing elastic element; 33, fixing element; 400, shaft; 401, fourth groove. Detailed Implementation

[0026] The following will illustrate this solution provided in conjunction with specific embodiments and accompanying drawings.

[0027] 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.

[0028] The drive assembly in the measuring device is used to drive the sensing unit to rotate relative to the base to achieve a larger measurement angle. Conventional drive assemblies typically include a worm and a worm wheel, which mesh with each other; that is, the sidewalls of the helical teeth of the worm and the sidewalls of the worm teeth of the worm wheel are in contact with each other. Thus, when the worm is driven to rotate by a drive source, it can drive the worm wheel to rotate synchronously. However, after long-term use, the transmission accuracy of the drive assembly will decrease; for example, after the worm rotates by a predetermined angle, the worm wheel may rotate by a smaller angle than it should.

[0029] To address the aforementioned problems, the inventors discovered that the issue arises because the helical teeth of the worm and the worm wheel mesh for extended periods, rubbing against each other. This causes the thickness of the helical teeth and worm wheel teeth to gradually decrease, resulting in the worm wheel teeth being unable to fill the gap between two adjacent helical teeth during meshing, thus creating a gap between them. Furthermore, after prolonged operation, the worm and worm wheel may shift due to deformation or displacement, failing to maintain their intended positions. For example, if the worm tooth cross-section is an inverted triangle, the worm wheel may shift a small distance away from the worm, creating a gap between the worm tooth and the helical teeth. Once this gap appears, the worm wheel will not immediately rotate when it first begins to turn because the helical teeth are not yet engaged with the worm tooth. Only after the helical teeth have moved a certain distance and engaged with the worm tooth will the worm wheel rotate. The length of this movement depends on the size of the gap between the worm tooth and the helical teeth. When the worm rotates but the worm wheel does not, it will affect the transmission accuracy of the drive assembly. The transmission accuracy depends on whether there is a gap between the worm teeth and the helical teeth.

[0030] To address the aforementioned technical problems, this disclosure provides a measuring device with an improved drive assembly structure to reduce the risk of decreased transmission accuracy due to wear or misalignment between its components. For ease of understanding, the overall structure of the measuring device according to this disclosure is first illustrated below. It should be understood that the structure of the measuring device is not limited to the following description. For example, one or more elements introduced below may be omitted or replaced, and their layout relationships may be altered.

[0031] refer to Figure 1 and Figure 2The measuring device may include a base 100, a sensing unit 200, and a drive assembly 300. The base 100 is adapted to be fixed to a support. The measuring device can be installed at a predetermined position via the base 100, placing the object to be measured within the measuring range of the device. In some applications, the object to be measured may be a subway, railway, or bridge, and the support may be buildings surrounding the object. One end of the base 100, such as the bottom end, may be fixed to the support. The other end of the base 100, such as the top end, may support the sensing unit 200.

[0032] The sensing unit 200 may include a housing and a laser sensing module and / or an image sensing module (not shown) at least partially housed within the housing. 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 may be housed within the housing. The housing isolates the laser sensing module and the image sensing module from the external environment, preventing damage from external contaminants. The sensing unit 200 is rotatably mounted on the base 100 via a shaft 400. In some embodiments, there may be two shafts 400. Each shaft 400 may have one end fixedly connected to the sensing unit 200 and the other end rotatably connected to the base 100.

[0033] refer to Figure 2 and Figure 3 The drive assembly 300 can be disposed within the base 100 and rotates via the drive shaft 400 to drive the sensing unit 200 to rotate relative to the base 100 about the axis of the shaft 400. The drive assembly 300 includes a drive source 30, a worm gear 31, and a worm wheel 32. The drive source 30 is used to drive the worm gear 31, and the drive source 30 can be an electric motor. Figure 3 In this example, the transmission between the drive source 30 and the worm 31 is a gear transmission. In some embodiments, the transmission between the drive source 30 and the worm 31 can also be a belt, chain, or other transmission method, as long as the drive source 30 can drive the worm 31 to rotate. The worm 31 is arranged along the tangential direction of the worm wheel 32. The worm 31 meshes with the worm wheel 32 and is controlled by the drive source 30 to drive the worm wheel 32. That is, when the worm 31 rotates, it can drive the worm wheel 32 to rotate. The worm wheel 32 is fixedly connected to the shaft 400, and both can rotate relative to the base 100. The worm wheel 32 can be integrally formed with the shaft 400, or it can be fixedly connected by bolts, welding, or other methods. Thus, when the worm wheel 32 rotates, it can drive the shaft 400 to rotate along the axis of the shaft 400, thereby causing the sensing unit 200 to rotate relative to the base 100 about the axis of the shaft 400.

[0034] refer to Figures 3-5The worm gear 32 includes a first body 321, a second body 322, and a biasing elastic element 323. The first body 321 can be located on the side of the second body 322 closer to the sensing unit 200, or on the side of the second body 322 farther from the sensing unit 200. The first body 321 is coaxial with and fixedly connected to the shaft 400. The first body 321 can be integrally formed with the shaft 400, or it can be fixedly connected by bolts, welding, or other methods. The first body 321 is coaxial with the shaft 400, so that when the first body 321 rotates, the shaft 400 can rotate around the axis of the shaft 400. The second body 322 is coaxial with the shaft 400 and rotatably connected relative to the first body 321. The biasing elastic element 323 is configured to apply an elastic force to the first body 321 and the second body 322, so that the first worm tooth 3211 on the first body 321 and the second worm tooth 3221 on the second body 322 apply a force to the worm 31.

[0035] In some embodiments, the first worm gear 3211 on the first body 321 and the second worm gear 3221 on the second body 322 apply a force in the same direction to the worm 31. In this way, the first worm gear 3211 on the first body 321 and the second worm gear 3221 on the second body 322 can simultaneously engage with the same sidewall of the helical teeth 312 on the worm 31. When the helical teeth 312 on the worm 31 apply rotational force to the worm wheel, the first worm gear 3211 and the second worm gear 3221 mesh with the helical teeth 312 on the worm 31 in the same direction, thereby effectively increasing the contact area between the worm wheel 32 and the helical teeth 312 on the worm 31, so as to improve the load that the worm wheel 32 can withstand.

[0036] In other embodiments, the first worm gear 3211 on the first body 321 and the second worm gear 3221 on the second body 322 apply opposite forces to the worm 31. The first worm gear 3211 on the first body 321 and the second worm gear 3221 on the second body 322 can mesh with the two sidewalls of the helical teeth 312 on the worm 31 in opposite rotational directions, respectively. Specifically, refer to... Figure 5The first worm gear 3211 on the first body 321 is in contact with one sidewall of the helical tooth 312 on the worm wheel 32, and the second worm gear 3221 on the second body 322 is in contact with the other sidewall of the helical tooth 312 on the worm wheel 32. Under the action of the biasing elastic member 323, the first body 321 and the second body 322 can have a tendency to rotate in opposite directions, that is, the first worm gear 3211 and the second worm gear 3221 have a tendency to move closer to the helical tooth 312 between them, so that the helical tooth 312 is clamped between the first worm gear 3211 and the second worm gear 3221. Even if the first worm gear 3211 and the second worm gear 3221 and the helical tooth 312 have gaps due to wear or movement, the first worm gear 3211 and the second worm gear 3221 can also eliminate the gaps between the worm gear and the helical tooth 312 under the action of the biasing elastic member 323, and always maintain a state of contact with the helical tooth 312. Therefore, when the helical teeth 312 on the worm gear 31 are driven to rotate, they can drive the first body 321 and the second body 322 to rotate synchronously, reducing the risk of a decrease in the transmission accuracy of the drive assembly 300 due to gaps between the worm gear and the helical teeth 312.

[0037] refer to Figure 4The meshing surface width of the first worm gear 3211 of the first body 321 is configured to be greater than or equal to the meshing surface width of the second worm gear 3221 of the second body 322. The meshing surface width of the worm gear can be expressed as the thickness of the worm gear. Since the first body 321 is fixedly connected to the shaft 400 and drives the shaft 400 and the sensing unit 200 to rotate around the axis of the shaft 400, the first body 321 can play the main transmission role, applying rotational force to the shaft 400. The meshing surface of the first worm gear 3211 should have an appropriate width to have sufficient strength and not be easily damaged during transmission. The second body 322 can play the role of improving transmission accuracy. The meshing surface width of the second worm gear 3221 can be smaller than the meshing surface width of the first worm gear 3211, but its width should not be too small to avoid failure to mesh with the helical teeth 312 on the worm 31. For example, when the worm 31 drives the worm wheel 32 to rotate clockwise, the helical teeth 312 on the worm 31 move towards the first worm tooth 3211, allowing the rotational force to be directly applied to the shaft 400 through the first worm tooth 3211 of the first body 321. When the worm 31 drives the worm wheel 32 to rotate counterclockwise, the helical teeth 312 on the worm 31 move towards the second worm tooth 3221, allowing the rotational force to be transmitted to the elastic biasing member through the second worm tooth 3221 of the second body 322. This rotational force cannot overcome the elastic force exerted by the elastic biasing member on the first body 321 and the second body 322, so the elastic biasing member does not deform and directly transmits the rotational force to the first body 321, and then to the shaft 400. Thus, regardless of the direction in which the worm 31 rotates, the worm 31 and the worm wheel 32 can rotate synchronously. In some embodiments, the ratio between the meshing surface width of the first worm gear 3211 of the first body 321 and the meshing surface width of the second worm gear 3221 of the second body 322 is in the range of 1:1 to 4:1. For example, the meshing surface width of the first worm gear 3211 of the first body 321 is 5.5 mm, and the meshing surface width of the second worm gear 3221 of the second body 322 is 4 mm. Under such parameter settings, the first body 321 has sufficient strength, and the second body 322 can also mesh with the helical teeth 312 on the worm 31 to improve transmission accuracy.

[0038] refer to Figure 6On the longitudinal section of the worm wheel 32 perpendicular to the rotation axis L of the worm 31, the projection of the rotation axis L of the worm 31 along the radial direction of the worm wheel 32 is located at the center of the surface of the worm wheel 32. That is, the projection of the rotation axis of the worm 31 onto the surface of the worm wheel 32 is located at the center of the thickness direction of the worm wheel 32. When the meshing surface width of the first worm tooth 3211 of the first body 321 is greater than the meshing surface width of the second worm tooth 3221 of the second body 322, the projection of the rotation axis of the worm 31 onto the surface of the worm wheel 32 is located on the first body 321, and the first worm tooth 3211 of the first body 321 has a larger contact area with the helical tooth 312 of the worm 31. When the meshing surface width of the first worm tooth 3211 of the first body 321 is equal to the meshing surface width of the second worm tooth 3221 of the second body 322, the projection of the rotation axis of the worm 31 onto the surface of the worm wheel 32 is located between the first body 321 and the second body 322, and the first worm tooth 3211 of the first body 321 and the second worm tooth 3221 of the second body 322 have the same contact area with the helical tooth 312 of the worm 31. Therefore, it can be ensured that both the first worm tooth 3211 of the first body 321 and the second worm tooth 3221 of the second body 322 can mesh with the helical tooth 312 of the worm 31.

[0039] refer to Figure 6A first groove 3212 is provided on the side of the first body 321 facing the second body 322, and a second groove 3222 is correspondingly provided on the side of the second body 322 facing the first body 321. The first groove 3212 and the second groove 3222 together form a cavity for accommodating the biasing elastic member 323. The biasing elastic member 323 can be disposed in the cavity between the first body 321 and the second body 322, thereby allowing the biasing elastic member 323 to be located inside the worm gear 32, reducing space occupation. The biasing elastic member 323 can be fixedly connected at one end to the first body 321 and at the other end to the second body 322. In this case, the first groove 3212 and the second groove 3222 can be annular grooves, that is, grooves surrounding the axis of the shaft 400, or non-annular grooves, such as straight grooves. When the worm gear 32 and the worm 31 are engaged, the biasing elastic member 323 can be in a non-free state to apply an elastic force to the first body 321 and the second body 322. For example, the first body 321 can be rotated relative to the second body 322 in a first preset direction to stretch the biasing elastic member 323. The biasing elastic member 323 can apply a force to the first body 321 rotating in a second preset direction and a force to the second body 322 rotating in the first preset direction, so that the first worm gear 3211 on the first body 321 and the second worm gear 3221 on the second body 322 can respectively mesh with the two side walls of the helical teeth 312 on the worm wheel 32 in opposite rotation directions. Alternatively, the first body 321 can be rotated relative to the second body 322 in a second preset direction to compress the biasing elastic member 323, so that the biasing elastic member 323 can apply a force to the first body 321 rotating in the first preset direction and a force to the second body 322 rotating in the second preset direction, so that the first worm gear 3211 on the first body 321 and the second worm gear 3221 on the second body 322 can respectively mesh with the two side walls of the helical teeth 312 on the worm wheel 32 in opposite rotation directions. The second preset direction is the opposite of the first preset direction. The first preset direction can be clockwise, and the second preset direction can be counterclockwise. Specifically, refer to... Figure 7 The biasing elastic element 323 can be a torsion spring, which is eccentrically positioned between the first body 321 and the second body 322. That is, the center of the torsion spring's arc is not at the same point as the center of the first body 321. Therefore, part of the torsion spring can maintain a large distance from the edge of the first body 321, allowing for a larger deformation space and thus providing greater elastic force to both the first body 321 and the second body 322. One end of the torsion spring can be fixedly connected to the first body 321, and the other end can be fixedly connected to the second body 322. This application does not limit the method of fixing the torsion spring to the first body 321 and the second body 322.

[0040] In some embodiments, the biasing elastic member 323 can be pre-pressed into the receiving cavity, with one end abutting against the first body 321 and the other end abutting against the second body 322. When the first body 321 rotates relative to the second body 322 in a preset direction, the biasing elastic member 323 is compressed, so that the biasing elastic member 323 can apply a force to the first body 321 that rotates in the opposite direction of the preset direction, and apply a force to the second body 3221 that rotates in the preset direction, so that the first worm gear 3211 on the first body 321 and the second worm gear 3221 on the second body 322 mesh with the two sidewalls of the helical teeth 312 on the worm wheel 32 in opposite rotational directions. For example, the biasing elastic member 323 can be a helical spring, which can be in a compressed state, with one end abutting against the first body 321 and the other end abutting against the second body 322, as long as the helical spring can apply an elastic force to the first body 321 and the second body 322 to cause them to rotate relative to each other.

[0041] refer to Figure 6 To reduce the space occupied by the worm gear 32, the first body 321 and the second body 322 are fitted together and can rotate relative to each other. The first body 321 and the second body 322 will rub against each other on their mating surfaces. Therefore, this disclosure provides a third annular groove 3213 on the circumferential outer side of the first groove 3212 on the side of the first body 321 facing the second body 322. The third groove 3213 can reduce the friction area between the first body 321 and the second body 322, thereby reducing the frictional force between them. If the friction between the first body 321 and the second body 322 is too great, and a gap appears between the first worm gear 3211 of the first body 321 and the second worm gear 3221 of the second body 322 and the helical teeth 312 of the worm 31, the first body 321 and the second body 322 may not be able to rotate relative to each other under the action of the biasing elastic element 323. Consequently, the first worm gear 3211 and the second worm gear 3221 cannot simultaneously fit against the two sidewalls of the helical teeth 312, affecting the transmission accuracy of the drive assembly 300. In the above solution, the third groove 3213 can reduce the friction between the first body 321 and the second body 322, thereby reducing the risk that excessive friction between them will affect the transmission accuracy of the drive assembly 300. This disclosure does not limit the cross-sectional shape of the groove, for example, it can be rectangular or arc-shaped.

[0042] refer to Figure 4 and Figure 6The drive assembly 300 also includes a fixing member 33, which is located on the side of the second body 322 opposite to the first body 321 and is fixedly connected to the first body 321. For example, the fixing member 33 is detachably fixed to the first body 321, and the connection method can be a bolt connection. The fixing member 33 is at least partially abutted against the side of the second body 322 opposite to the first body 321 to prevent the second body 322 from moving in a direction opposite to the first body 321. The first body 321 can hold the second body 322 in a predetermined position.

[0043] Specifically, refer to Figure 4 and Figure 6 The first body 321 includes a first flange 3214 extending towards the side where the second body 322 is located. The first flange 3214 is a ring with a central openwork. The second body 322 has a central shaft hole, the inner surface of which fits against the outer peripheral surface of the first flange 3214 to fit the second body 322 onto the first flange 3214. A second flange 3215 is provided on the first flange 3214, the radius of which is smaller than that of the first flange 3214. The second flange 3215 is a ring with a central openwork, and the second flange 3215 and the first flange 3214 are coaxially arranged. The fixing member 33 is a ring with a central openwork. A fourth groove 401 is provided on the inner end face of the fixing member 33, wherein the inner end face is the end face of the fixing member 33 closest to the second body 322. The sidewall of the fourth groove 401 fits against the outer peripheral surface of the second flange 3215. The bottom wall of the fourth groove 401 is fitted and fixedly connected to the outer end face 3216 of the second flange 3215, wherein the outer end face is the end face of the second flange 3215 near the fixing member 33. Thus, the fixing member 33 is fixedly connected to the first body 321 and is at least partially fitted onto the second flange 3215. In the radial direction of the shaft 400, the fixing member 33 at least partially protrudes from the outer peripheral surface of the first flange 3214. Thus, a portion of the inner end face of the fixing member 33 can fit against the second body 322 to prevent the second body 322 from moving away from the first body 321. In the above technical solution, the central portions of the shaft 400, the first body 321, the second body 322, and the fixing member 33 can all be hollowed out, allowing connecting lines within the base 100, such as wires or communication lines, to pass through the hollowed-out portions and connect to the laser sensing module and / or image sensing module within the sensing unit 200.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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: Base; The sensing unit is rotatably mounted on the base via a shaft; A drive assembly is disposed within the base and drives the shaft to rotate, thereby causing the sensing unit to rotate relative to the base about the axis of the shaft. The drive assembly includes a drive source, a worm gear, and a worm wheel. The drive source drives the worm gear. The worm gear meshes with the worm wheel and is controlled by the drive source to drive the worm wheel. The worm wheel is fixedly connected to the shaft. The worm gear includes a first body, a second body, and a biasing elastic element. The first body is coaxial with and fixedly connected to the shaft, and the second body is coaxial with the shaft and rotatably connected relative to the first body. The biasing elastic element is configured to apply an elastic force to the first body and the second body, so that the first worm tooth on the first body and the second worm tooth on the second body apply a force to the worm.

2. The measuring device according to claim 1, characterized in that, The meshing surface width of the first worm tooth of the first body is configured to be greater than or equal to the meshing surface width of the second worm tooth of the second body.

3. The measuring device according to claim 2, characterized in that, The ratio between the meshing surface width of the first worm tooth of the first body and the meshing surface width of the second worm tooth of the second body is in the range of 1:1 to 4:

1.

4. The measuring device according to claim 1, characterized in that, On a longitudinal section perpendicular to the rotation axis of the worm gear, the projection of the rotation axis of the worm gear along the radial direction of the worm gear is located at the center of the worm gear surface.

5. The measuring device according to claim 1, characterized in that, The first body has a first groove on the side facing the second body, and the second body has a corresponding second groove on the side facing the first body. The first groove and the second groove are used to jointly form a receiving cavity for accommodating the bias elastic member.

6. The measuring device according to claim 5, characterized in that, The biasing elastic element is disposed in the receiving cavity, with one end fixedly connected to the first body and the other end fixedly connected to the second body. When the first body rotates relative to the second body in a first preset direction, the biasing elastic element is stretched. When the first body rotates relative to the second body in a second preset direction, the biasing elastic element is compressed. The second preset direction is opposite to the first preset direction.

7. The measuring device according to claim 5, characterized in that, The biasing elastic element is pre-pressed into the receiving cavity, with one end abutting against the first body and the other end abutting against the second body. When the first body rotates relative to the second body in a preset direction, the biasing elastic element is compressed.

8. The measuring device according to claim 5, characterized in that, On the side of the first body facing the second body, a third groove in an annular shape is provided on the circumferential outer side of the first groove.

9. The measuring device according to claim 1, characterized in that, The drive assembly further includes a fixing member located on the side of the second body away from the first body and fixedly connected to the first body. The fixing member is at least partially attached to the side of the second body away from the first body to prevent the second body from moving in a direction away from the first body.

10. The measuring device according to claim 9, characterized in that, The first body includes a first flange extending toward the side where the second body is located, the second body is sleeved on the first flange, a second flange is provided on the first flange, the fastener is at least partially sleeved on the second flange, and in the radial direction of the shaft, the fastener at least partially protrudes from the outer peripheral surface of the first flange.

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