Balancing mechanism of measuring apparatus, and measuring apparatus

Abstract

A balancing mechanism of a measuring apparatus, and a measuring apparatus. The measuring apparatus comprises a base, at least one arm member, and a shaft assembly connected between the base and the arm member. The balancing mechanism comprises: an outer supporting structure, which is disposed on the peripheral side of the arm member so as to support the arm member when the arm member rotates around the shaft assembly; and a balancing structure, which is sleeved on the shaft assembly and comprises a balancing assembly (321), a shaft sleeve assembly (322), and a mounting assembly (323) connected to the base, wherein the shaft sleeve assembly is sleeved on the shaft assembly and is fixed to the mounting assembly; and the balancing assembly is sleeved on the shaft sleeve assembly and is connected to the outer supporting structure, such that when supporting the arm member to rotate, the outer supporting structure drives the balancing assembly to rotate around the shaft sleeve assembly so as to generate a torque force, thereby balancing the center of gravity of the measuring apparatus.

Description

Balancing mechanism of measuring equipment and measuring equipment Technical Field

[0001] The present application relates to the technical field of articulated arm-type measuring equipment, and in particular to a balancing mechanism of a measuring equipment and the measuring equipment. Background Art

[0002] Articulated arm measuring equipment, as a precision measuring tool, is widely used in fields such as mold and part dimensional measurement, quality inspection, engineering data collection, and workpiece assembly. It typically consists of a base for stable support and an articulated arm connected to the base. A measuring probe is located at the end of the arm for measurement. Furthermore, the articulated arm includes arm sections connected by joints to provide the measuring probe with rotational freedom, mimicking human joints. During measurement, the measuring operator can pull the measuring probe into contact with or sense the object being measured to capture its structural characteristics.

[0003] During measurement, the center of gravity of the articulated arm and the measuring probe changes with the position of the measured point. Some related technologies use built-in balancing structures within the joints of the articulated arm to automatically counteract these center-of-gravity torque changes. However, since these built-in balancing structures act directly on the arm portion of the articulated arm, long-term stress on this portion can cause deflection, affecting measurement accuracy and rendering the device unusable. Furthermore, since these built-in balancing structures provide balancing force, any damage requires replacement of the entire joint, increasing the difficulty and cost of equipment repair.

[0004] Therefore, how to design a balancing mechanism of the measuring device so as to avoid deformation of the arm portion due to stress and to facilitate replacement is a technical problem that needs to be solved urgently by those skilled in the art.

[0005] Summary of the Invention

[0006] In view of the shortcomings of the related technologies mentioned above, the purpose of this application is to provide a balancing mechanism and measuring equipment for a measuring device, which is used to solve the technical problems that the measuring device is difficult to replace during the measurement process and the measurement accuracy is reduced due to the deformation of the arm part under force.

[0007] To achieve the above-mentioned purpose and other related purposes, the first aspect of the present application provides a balancing mechanism of a measuring device, the measuring device comprising a base, at least one arm member, and an axis assembly connected between the base and the arm member, the balancing mechanism comprising: an outer support structure, arranged on the peripheral side of the arm member to support the arm member during the rotation of the arm member around the axis assembly; a balancing structure, sleeved on the axis assembly, comprising a balancing assembly, a shaft sleeve assembly, and a mounting assembly connected to the base; wherein the shaft sleeve assembly is sleeved on the axis assembly and fixed on the mounting assembly, the balancing assembly is sleeved on the shaft sleeve assembly and connected to the outer support structure, so that the outer support structure supports the arm member while driving the balancing assembly to rotate around the shaft sleeve assembly to generate torque, so that the center of gravity of the measuring device is balanced.

[0008] In certain embodiments disclosed in the first aspect of the present application, the external support structure includes: an arm support assembly, which is arranged around the arm member to support the arm member; and a connecting assembly, which is connected between the arm support assembly and the balancing structure to achieve a fixed connection between the balancing structure and the external support structure.

[0009] In certain embodiments disclosed in the first aspect of the present application, the arm support assembly includes: an outer sleeve, which is non-contactly mounted on the arm member and whose proximal end is connected to the connecting assembly; and an arm support portion, which is arranged at the distal end of the outer sleeve and supports the arm member when the arm member is placed in the outer sleeve.

[0010] In certain embodiments disclosed in the first aspect of the present application, the arm support portion includes a coupling and a support member, the coupling is adapted to be connected to the distal end of the outer sleeve, and the support member is configured on the side wall of the coupling to support the arm member in a point support or line support manner.

[0011] In certain embodiments disclosed in the first aspect of the present application, there are at least two support members.

[0012] In certain embodiments disclosed in the first aspect of the present application, the support member is configured as a roller.

[0013] In certain embodiments disclosed in the first aspect of the present application, two adjacent support members are distributed at 120°.

[0014] In certain embodiments disclosed in the first aspect of the present application, the connecting assembly includes a first portion and a second portion that are adapted to each other, and the first portion and the second portion are tightly embraced at the proximal end of the arm support assembly.

[0015] In certain embodiments disclosed in the first aspect of the present application, when the balancing structure is sleeved on the shaft assembly, there is a circumferential gap between the balancing structure and the shaft assembly.

[0016] In certain embodiments disclosed in the first aspect of the present application, the shaft sleeve assembly includes a core shaft, which is configured as a ring-shaped structure that penetrates from front to back and is sleeved on the shaft assembly.

[0017] In certain embodiments disclosed in the first aspect of the present application, the sleeve assembly further comprises a core shaft fixing ring fixedly connected to the mounting assembly, and a fixing member passes through the core shaft fixing ring and is connected to the end face of the core shaft to fix the core shaft.

[0018] In certain embodiments disclosed in the first aspect of the present application, the balancing assembly includes: a torsion spring, sleeved on the shaft sleeve assembly, having a fixed end and a follower end arranged opposite to each other, the fixed end being connected to a torsion spring fixing portion, and the torsion spring fixing portion being fixedly connected to the mounting assembly; a rotating connection portion, fixedly connected to the follower end of the torsion spring, which is also fixedly connected to the external support structure to adjust the torque force of the torsion spring during the rotation of the external support structure so that the center of gravity of the measuring device is balanced.

[0019] In certain embodiments disclosed in the first aspect of the present application, the rotating connection portion is configured as a rotating connection ring, which is sleeved on the torsion spring and connected to the shaft sleeve assembly through a bearing structure.

[0020] In certain embodiments disclosed in the first aspect of the present application, an isolation plate is further provided between the rotating connecting ring and the torsion spring to prevent contamination.

[0021] In certain embodiments disclosed in the first aspect of the present application, a limiting member is configured on the rotating connection portion to prevent the outer support structure from rotating in the opposite direction.

[0022] In certain embodiments disclosed in the first aspect of the present application, the torsion spring fixing portion can also be used to pre-tighten the torsion spring, and the torsion spring fixing portion includes: a pre-tightening adjustment portion, which is fixedly connected to the mounting assembly; a fixing ring, which is sleeved on the fixed end of the torsion spring and is connected to the fixed end by a fixing member that is snapped into the mounting groove on the fixing ring. It is also positioned in the pre-tightening adjustment portion so that the fixed end is fixed. The pre-tightening adjustment portion can also push the fixing ring to adjust the pre-tightening angle of the torsion spring.

[0023] In certain embodiments disclosed in the first aspect of the present application, the preload adjustment portion includes: a preload adjustment ring, which cooperates with a retaining ring to accommodate the fixing ring, an adjustment groove is configured in the preload adjustment ring, and when the fixing ring is placed in the preload adjustment ring, a protrusion provided on it is located in the adjustment groove; an adjusting member, which enters the adjustment groove through an adapted hole on the circumferential side of the preload adjustment ring to contact the protrusion, and is used to adjust the preload angle of the torsion spring by rotation.

[0024] In certain embodiments disclosed in the first aspect of the present application, the mounting assembly includes: a bearing structure, including a bearing portion and a locking portion configured on the bearing portion, through which the locking portion cooperates with the base to lock the bearing portion on the base; a connecting bracket, mounted on the bearing portion and connected to the balancing structure, so that the balancing structure can rotate relative to the base.

[0025] In certain embodiments disclosed in the first aspect of the present application, the bearing portion includes a bearing body and a bearing shell, the inner ring of the bearing body is locked to the base by a locking portion, the bearing shell is configured on the outer ring of the bearing body and the connecting bracket is installed on the bearing shell so that the connecting bracket can rotate relative to the base.

[0026] The second aspect of the present application provides a measuring device, including a base, an articulated arm connected to the base, and a measuring device arranged at the distal end of the articulated arm, the articulated arm including an axis assembly configured at its proximal end and an arm member connected to the axis assembly, the measuring device also includes a balancing mechanism as described in any embodiment disclosed in the first aspect of the present application.

[0027] In certain embodiments disclosed in the second aspect of the present application, the measuring device is a three-coordinate measuring arm device.

[0028] In summary, the balancing mechanism of the measuring device and the measuring device provided in the present application are configured to include an external support structure and a balancing structure. The external support structure is sleeved around the circumference of the arm member to support the arm member, and the balancing structure is connected to the external support structure and connected to the base of the measuring device. Thus, the external support structure bears the force of the balancing structure and further transfers it to the base, thereby avoiding deflection and deformation of the arm member of the measuring device. In addition, the balancing structure is sleeved on the shaft assembly corresponding to the arm member through its shaft sleeve assembly. The balancing assembly of the balancing structure is sleeved on the shaft sleeve assembly and connected to the external support structure, making the balancing structure easy to remove and replace from the measuring device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The specific features of the present application are set forth in the appended claims. The features and advantages of the present invention can be better understood by referring to the exemplary embodiments described in detail below and the accompanying drawings. A brief description of the drawings is as follows:

[0030] FIG1 is a schematic structural diagram showing a balancing mechanism configured on a measuring device in one embodiment of the present application.

[0031] FIG2 is a schematic structural diagram showing a balancing mechanism and a measuring device separated in one embodiment of the present application.

[0032] FIG3 is a schematic structural diagram of the internal and external support structures in one embodiment of the present application.

[0033] FIG4 is a schematic structural diagram of an arm support portion in one embodiment of the present application.

[0034] FIG5 is a schematic structural diagram showing a connection assembly separated from an arm support assembly in one embodiment of the present application.

[0035] FIG6 is a cross-sectional schematic diagram showing a balancing mechanism configured at a balancing structure on a measuring device in one embodiment of the present application.

[0036] FIG. 7 is a partial enlarged view of the embodiment shown in FIG. 6 .

[0037] FIG8 is a schematic structural diagram of a balancing structure in one embodiment of the present application.

[0038] FIG9 is a schematic diagram showing the decomposed structure of a balancing structure in one embodiment of the present application.

[0039] FIG. 10 is a schematic diagram showing the exploded structure of a torsion spring fixing portion in one embodiment of the present application.

[0040] FIG. 11 is a partially enlarged schematic diagram of the preload adjustment ring in the embodiment shown in FIG. 10 of the present application.

[0041] FIG. 12 is a schematic structural diagram of an installation assembly in one embodiment of the present application.

[0042] FIG13 is a cross-sectional view showing an installation assembly according to an embodiment of the present application.

[0043] FIG14 is a partially enlarged schematic diagram showing the installation assembly in the embodiment shown in FIG13 of the present application. DETAILED DESCRIPTION

[0044] The following describes the implementation of the present application through specific embodiments. People familiar with this technology can easily understand other advantages and effects of the present application from the contents disclosed in this specification.

[0045] In the following description, reference is made to the accompanying drawings, which describe several embodiments of the present application. It should be understood that other embodiments may also be used, and that mechanical, structural, electrical, and operational changes may be made without departing from the spirit and scope of the present disclosure. The following detailed description should not be considered restrictive, and the scope of the embodiments of the present application is limited only by the claims of the published patents. The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application. Spatially related terms, such as "upper", "lower", "left", "right", "below", "below", "lower", "above", "upper", etc., may be used in the text to illustrate the relationship between one element or feature shown in the figure and another element or feature.

[0046] Although in some instances the terms first, second, etc. are used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first shaft assembly can be referred to as a second shaft assembly, and similarly, a second shaft assembly can be referred to as a first shaft assembly without departing from the scope of the various described embodiments. The first shaft assembly and the second shaft assembly are both describing a certain shaft assembly, but unless the context clearly indicates otherwise, they are not the same shaft assembly. Similar situations also include a first arm member and a second arm member, a first part and a second part, a first fixing member and a second fixing member, etc.

[0047] Furthermore, as used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It should be further understood that the terms "comprise", "include" indicate the presence of the described features, steps, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Thus, "A, B, or C" or "A, B, and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B, and C". Exceptions to this definition occur only when the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

[0048] In view of the technical problems mentioned in the background technology, some related technologies configure an external pneumatic balancing mechanism for the measuring equipment to transfer the force on the arm part. Specifically, it includes a gas spring balancing structure and a bracket, which supports the arm part. The gas spring structure is external to the articulated arm and connected to the bracket to support the bracket through piston movement to achieve self-balancing. On the one hand, this external gas spring structure occupies the working space of the measuring equipment and is prone to collision and interference with the object to be measured during use, affecting the measurement. On the other hand, the angle of balanced rotation provided by the gas spring structure is limited. When the arm part is pressed down to a certain angle, the gas spring structure will be unable to provide a balancing force, causing the articulated arm to fall.

[0049] In a possible embodiment, the present application proposes a balancing mechanism for a measuring device and a measuring device, wherein the balancing mechanism is configured to include an external support structure and a balancing structure, wherein the external support structure is sleeved around the circumference of an arm member to support the arm member, and the balancing structure is connected to the external support structure and to the base of the measuring device, so that the external support structure bears the force of the balancing structure and further transfers it to the base, thereby avoiding deflection and deformation of the arm member of the measuring device. In addition, the balancing structure is sleeved on the shaft assembly corresponding to the arm member through its shaft sleeve assembly, and the balancing assembly of the balancing structure is sleeved on the shaft sleeve assembly and connected to the external support structure, so that the balancing structure is arranged around the shaft assembly and is convenient for disassembly and assembly. In this way, the balancing structure does not occupy the working space of the measuring device and is easy to detach from the measuring device.

[0050] Please refer to Figures 1 and 2. Figure 1 shows a structural schematic diagram of a balancing mechanism configured on a measuring device in one embodiment of the present application, and Figure 2 shows a structural schematic diagram of a balancing mechanism separated from a measuring device in one embodiment of the present application. As shown in Figures 1 and 2, the measuring device includes: an articulated arm 1, a measuring device 2, a balancing mechanism 3, and a base 4. It should be noted here that the composition of the above-mentioned measuring device is only an exemplary description. In some embodiments, the balancing mechanism can also be configured on the measuring device as an independent structure, that is, the measuring device can include an articulated arm, a measuring device, and a base, and the balancing mechanism is configured on the measuring device. In other embodiments, the measuring device to which the balancing mechanism is applicable can also adopt other structures, such as a three-coordinate measuring machine.

[0051] The base 4 serves as a basic component of the measuring device for supporting the articulated arm. In one embodiment, the base 4 may include a mounting device 40, which allows the measuring device to be removably mounted on a measuring platform, such as an inspection table, a processing platform, a wall, a floor, or a tripod. In one example, the mounting device 40 may be configured as a threaded ring structure, which allows the measuring device to be placed on the measuring platform for measurement by tightening the threaded ring structure to the measuring platform, and which allows the measuring device to be removed from the measuring platform by loosening the threaded ring structure to the measuring platform. For example, an operating portion may be configured on the threaded ring structure to facilitate tightening or loosening operations.

[0052] In one embodiment, the base 4 may include a handle structure, which provides an operating space for the operator. For example, when the measuring device needs to be moved, the operator can hold it through the handle structure.

[0053] In one embodiment, the base 4 includes or houses a main control device. For example, the main control device can calculate three-dimensional coordinates based on the rotation information collected by the angle encoders in the articulated arm 1 and the position information of the measured point obtained by the measuring device 2.

[0054] In one embodiment, as shown in FIG2 , the articulated arm 1 has a relative proximal end and distal end, wherein the proximal end is connected to the base 1 and the distal end is provided with a measuring device 2, and the articulated arm 1 provides the measuring device 2 with the freedom to move in space so that the measuring device 2 can move to align with the point to be measured for measurement. The point to be measured corresponds to the position or part to be measured on the object to be measured. It should be noted that in subsequent embodiments, in order to clearly illustrate the relative positions of various components, structures, assemblies, mechanisms, components, equipment, or devices in the measuring equipment, the proximal end and distal end of the articulated arm are used as the reference for distinction, and the side of each component, structure, assembly, mechanism, component, equipment, or device that is relatively close to the proximal end of the articulated arm is called the proximal end (also called the proximal side), and the side that is relatively close to the distal end of the articulated arm is called the distal end (also called the distal side).

[0055] In one embodiment, as shown in FIG2 , the articulated arm 1 includes a first arm component 10, a second arm component 11, and six axis assemblies, each of which can provide rotational rotation or hinge-type rotation. The six axis assemblies in FIG2 are a first axis assembly 12, a second axis assembly 13, a third axis assembly 14, a fourth axis assembly 15, a fifth axis assembly 16, and a sixth axis assembly 17. The first axis assembly 12 is connected to the base 4 and provides rotational rotation centered around the axis of the base 4. The second axis assembly 13 is connected to the proximal end of the first arm component 10 and is connected to the first axis assembly 12. The second axis assembly 13 provides hinge-type rotation around an axis perpendicular to the first arm component 10 (which can correspond to the axis of the second axis assembly). A third axis assembly 14 is connected to the distal end of the first arm member 10 and provides rotational movement centered on the axis of the first arm member 10. A fourth axis assembly 15 is connected to the proximal end of the second arm member 11 and is connected to the third axis assembly 14. The fourth axis assembly 15 provides hinge-type rotation around an axis perpendicular to the second arm member 11 (which may correspond to the axis of the fourth axis assembly 15). A fifth axis assembly 16 is connected to the distal end of the second arm member 11 and provides rotational movement centered on the axis of the second arm member 11. A sixth axis assembly 17 is connected to the proximal end of the second arm member 11 and is connected to the fifth axis assembly 16. The sixth axis assembly 17 provides hinge-type rotation around an axis perpendicular to the second arm member 11 (which may correspond to the axis of the sixth axis assembly 17).

[0056] In some embodiments, the axis assemblies (e.g., the first axis assembly 12 and the second axis assembly 13) that are combined together to connect the first arm member 10 to the base 4 are collectively referred to as a first joint mechanism. Similarly, the axis assemblies (e.g., the third axis assembly 14 and the fourth axis assembly 15) that are combined together to connect the first arm member 10 to the second arm member 11 are collectively referred to as a second joint mechanism, and the axis assemblies (e.g., the fifth axis assembly 16 and the sixth axis assembly 17) that are combined together to connect the measuring device 2 to the second arm member 11 are collectively referred to as a third joint mechanism. In some embodiments, the positions of the axis assemblies and the number of axis assemblies included in each joint mechanism may also be different from those shown in FIG. 2 . For example, the third axis assembly 14 may be moved to the proximal end of the first arm member 10 and serve as the first joint mechanism together with the first axis assembly 12 and the second axis assembly 13, and the fourth axis assembly 15 serves as the second joint mechanism. Of course, the axis assemblies may also be combined in other ways, which will not be described in detail here.

[0057] In the embodiment shown in FIG2 , the articulated arm 1 is provided with six axis assemblies to provide six-axis rotation. Therefore, the measuring device in the embodiment shown in FIG2 can also be referred to as a six-axis coordinate measuring machine. In some embodiments, a seventh axis assembly can be further included to provide rotation of the measuring device. The measuring device provided with seven axis assemblies to provide seven-axis rotation is also referred to as a seven-axis coordinate measuring machine.

[0058] It should be understood that the configuration of the articulated arm with two arm members and six axis assemblies in Figure 2 is only an exemplary illustration, and the present application is not limited to this. The articulated arm can be configured with any number of arm members, and the axis assemblies connecting adjacent arm members, arm members and bases, or arm members and measuring devices can also be configured with any number. The articulated arm can provide more or less than six or seven axes of rotation, as long as the articulated arm includes at least one arm member connected to the base and an axis assembly connected between the base and the arm member to provide hinged rotation.

[0059] In one embodiment, the arm member in the articulated arm may be configured as an elongated cylindrical shape and may be made of a suitable rigid material, for example, a lightweight and high-strength metal alloy such as an aluminum alloy or a magnesium alloy, or a carbon composite material.

[0060] In one embodiment, each axis assembly includes an encoder, which can be configured as an angle encoder, that provides information about the relative rotation of the corresponding arm member. The information provided by the encoders of all axis assemblies can be used to determine the position of the measuring device relative to the base. Furthermore, the main control device described in the aforementioned embodiment can determine the three-dimensional coordinates of the point to be measured based on the rotation information provided by each encoder and the position data detected by the measuring device.

[0061] In one embodiment, as shown in Figure 2, the measuring device 2 includes a base 20 and a probe 21. The base 20 is connected to the distal end of the articulated arm 1, and further, is connected to the sixth axis assembly 17 in Figure 2. The probe 21 is detachably mounted on the base 20. In some examples, the probe 21 is configured as a contact detection member having different ends that can physically contact the object to be measured, including but not limited to a ball-type, touch-sensitive, curved, or extended probe. In some examples, the probe 21 is configured as a non-contact detection member that can measure the object to be measured in a non-contact manner, so as not to cause contact damage to the object to be measured. The non-contact detection member is, for example, a laser scanner, an optical sensor, an electrostatic sensor, etc.

[0062] Furthermore, the base 20 is provided with an interface unit. The interface unit may include a probe interface module and a trigger component interface module. At least one probe interface module is provided. For example, the probe 21 described in the above embodiment can be mounted on the base 20 via one probe interface module. Additional probe interface modules can be used to connect other probes, including but not limited to laser scanning heads and fork-shaped probes. The trigger component interface module is used to connect a trigger component, such as a handle or a keypad.

[0063] As described in the previous embodiment, a balancing mechanism can also be configured in the measuring device, and the balancing mechanism can be used to balance the changes in the center of gravity torque of the articulated arm. The balancing mechanism disclosed in some embodiments of the present application includes an external support structure and a balancing structure. The external support structure is configured on the peripheral side of the arm member connected to the base through at least one shaft assembly that provides hinged rotation, so as to support the arm member during the rotation of the arm member around the shaft assembly. The balancing structure is sleeved on the shaft assembly and connected to the external support structure, so that the external support structure can drive the balancing structure to rotate during the rotation of the arm member to generate a torque force that balances the changes in the center of gravity torque of the measuring device, thereby balancing the center of gravity of the measuring device. Taking Figures 1 and 2 as an example, the external support structure 31 of the balancing mechanism 3 can be configured on the peripheral side of the first arm member 10, and the balancing structure 32 of the balancing mechanism 3 is connected to the base 4 and sleeved on the second shaft assembly 13. In the subsequent embodiments, the possible structure of the balancing mechanism 3 is described by taking the balancing mechanism 3 configured on the measuring device in the manner shown in Figures 1 and 2 as an example, which does not limit the present application.

[0064] Please refer to FIG3 , which is a schematic diagram of the structure of the outer support structure in one embodiment of the present application. As shown in FIG3 , the outer support structure 31 includes an arm support assembly 311 and a connection assembly 312. As shown in FIG1 and FIG2 , the arm support assembly 311 is disposed around the first arm member 10 to support the first arm member 10, and the connection assembly 312 is connected between the arm support assembly 311 and the balancing structure 32 to achieve a fixed connection between the balancing structure 32 and the outer support structure 31.

[0065] In one embodiment, as shown in FIG3 , the arm support assembly 311 includes an outer sleeve 3111 and an arm support portion 3112. The outer sleeve 3111 is non-contactably sleeved on the first arm member 10, with its proximal end connected to the connecting assembly 312. The arm support portion 3112 is disposed at the distal end of the outer sleeve 3111 and supports the first arm member 10 when the first arm member 10 is placed in the outer sleeve 3111.

[0066] The outer sleeve 3111 is non-contactably mounted on the first arm member 10. Specifically, the outer sleeve 3111 surrounds the first arm member 10 with a certain gap therebetween, while the arm support portion 3112 alone provides support for the first arm member 10. This allows the outer sleeve 3111 to bear the torque provided by the balancing structure. Even if the outer sleeve 3111 deforms under long-term stress, the lack of contact with the first arm member 10 will not affect the accuracy of the first arm member 10. Furthermore, the first arm member 10 can be configured to be relatively thin, while the outer sleeve 3111 can be configured to be relatively thick.

[0067] In one embodiment, the outer sleeve 3111 can be configured as a hollow cylinder with a smooth surface to reduce friction with the surrounding environment. The length of the outer sleeve 3111 is configured to match the first arm member 10, and its material includes but is not limited to rigid materials such as alloy, cast iron, and carbon structural steel.

[0068] In order to prevent the axis of the first arm member 10 from being offset from the axis of the outer sleeve 3111 and affecting the measurement accuracy, in one embodiment, the arm support portion supports the first arm member in a point support or line support manner. Please refer to Figure 4, which shows a schematic structural diagram of the arm support portion in one embodiment of the present application. As shown in Figure 4, the arm support portion 3112 includes a coupling 31121 and a support member 31122. The coupling 31121 is adapted to be connected to the distal end 3111 of the outer sleeve, and the support member 31122 is configured on the side wall of the coupling 31121 to support the first arm member 10 in a point support or line support manner.

[0069] In one embodiment, the coupling member 31121 may be configured as an annular structure that is adapted to fit over the distal end of the outer sleeve 3111 in a tight fit. Examples of coupling methods for the coupling member 31121 and the outer sleeve 3111 include, but are not limited to, welding, bonding, mortise and tenon joints, and integral molding. In other examples, the coupling portion and the outer sleeve may not be distinguished; that is, the arm support portion 3112 may simply include the support member 31122, which is disposed on the outer sleeve to support the first arm member.

[0070] In one embodiment, the support member 31122 can be configured to contact the first arm member in a point-contact manner to provide point support for the first arm member. As shown in FIG4 , the support member 31122 is configured as a roller, and the roller includes a roller body and a roller shaft, and the roller body can rotate around the roller shaft. Accordingly, the coupling member 31121 is provided with a groove, the width of which is slightly greater than the thickness of the roller body. The roller shaft engages within the groove of the coupling member 31121, allowing the roller to be rotatably fixed to the coupling member 31121. This allows the first arm member 10 to slide relative to the roller to adjust its axis when the axis deviates from the axis of the outer sleeve 3111. Furthermore, to provide cushioning for the first arm member 10, the roller body can be made of, but not limited to, flexible materials such as rubber, silicone, and plastic.

[0071] In another embodiment, the support member 31122 can also be configured to contact the first arm member in a linear contact manner to achieve linear support for the first arm member. For example, the support member 31122 can be configured as a long strip support. In this way, the axis of the first arm member can also be adjusted.

[0072] In one embodiment, as shown in FIG4 , two support members 31122 may be configured. Furthermore, the two support members 31122 are distributed at a 120° angle, meaning that the angle α between the directions of the support forces of the two support members 31122 is 120°. Of course, in other embodiments, a plurality of support members 31122 greater than two may be configured, and two adjacent support members 31122 may be distributed at other angles, as long as the angle is less than 180°.

[0073] Please refer to Figure 5 in combination with Figure 3. Figure 5 shows a structural schematic diagram of the connection component separated from the arm support component in one embodiment of the present application. As shown in the figure, the connection component 312 includes a first part 3121 and a second part 3122. The first part 3121 and the second part 3122 are adapted to each other and are tightly embraced at the proximal end of the arm support component 311.

[0074] In the example shown in FIG5 , to accommodate the balancing structure 32 at the proximal end of the connecting assembly 312 and the arm support assembly 31 at the distal end, the connecting assembly 312 is configured as a wedge-shaped structure, narrow at the top and wide at the bottom, with an arc-shaped lower edge. As shown in FIG5 , the first portion 3121 and the second portion 3122 are identically configured and symmetrically arranged. For example, the distal end of the second portion 3122, located within the second portion 3122 where it contacts the arm support assembly 31, is semicircular in shape, with an inner diameter equal to the outer diameter of the arm support assembly 31. To achieve the connection between the first and second portions, a first screw hole is provided on the sidewall of the first portion 3121, and a second screw hole is provided where the second portion 3122 contacts the first portion 3121. The first and second screw holes correspond to and extend through each other, allowing a fixing member, such as a screw, to pass through the first and second screw holes to securely connect the first and second portions 3121 and 3122. To further secure the connection between the first and second portions, in some examples, multiple first and second screw holes may be provided.

[0075] Please refer to Figures 6 and 7. Figure 6 shows a cross-sectional schematic diagram of a balancing mechanism configured at a balancing structure on a measuring device in one embodiment of the present application. Figure 7 shows a partially enlarged view of the embodiment shown in Figure 6. As shown in Figures 6 and 7, when the balancing structure 32 is mounted on the second shaft assembly 13, a circumferential gap d is defined between the balancing structure 32 and the second shaft assembly 13. This means that the second shaft assembly 13 and the balancing structure 32 do not contact each other circumferentially and are separable from each other. This allows for easier separation and replacement of either the second shaft assembly 13 or the balancing structure 32 if they malfunction and require replacement.

[0076] In order to adapt to the balancing structure 32, in one embodiment, as shown in Figures 2 and 6, the second shaft assembly 13 includes a main shaft 131, an encoder 132, and a fixed part 133. The main shaft 131 can be, for example, as shown in Figure 6, spanning the first shaft assembly 12. Furthermore, a bracket 120 is provided on the first shaft assembly 12, and the main shaft 131 is fixedly provided on the bracket 120. The encoder 132 is arranged on the circumference of the main shaft 131 and is used to provide measurement and feedback of the real-time position of the first arm component 10. The fixed part 133 is used to connect the encoder 132 to the first arm component 10 so that the first arm component 10 can be hinged with the main shaft 131 as the center. In order to provide stable support for the first arm component 10 and adapt to different working environments, the material of the fixed part 133 includes but is not limited to alloy, high-strength plastic and stainless steel.

[0077] In one embodiment, encoder 132 comprises an encoder housing, an encoder disk, and a read head. The encoder housing is positioned around spindle 131 and houses the encoder disk and read head. The encoder housing can be connected to the fixed portion 133 described in the previous embodiment, thereby connecting encoder 132 to first arm member 10. The encoder disk has a pattern on its surface that can be measured by the read head. Since encoder 132 is connected to first arm member 10, first arm member 10 drives encoder 132 to actuate. When encoder 132 actuates, the pattern on the encoder disk changes accordingly. The read head reads these changes and obtains information about the actuation of spindle 131. In the example where encoder 132 is an angle encoder, the encoder disk has grating strips. When the spindle rotates, the grating strips on the encoder disk are blocked, generating corresponding optical signals. The read head, which may include an optical measurement device such as a camera, interprets the generated optical signals to obtain spindle rotation information and feeds this information back to a main control device, thereby determining the three-dimensional coordinates of the measured point. In some other examples, the encoder disk has multiple tracks or bit codes, each track or bit code corresponds to a binary value, and the reading head can read each binary value and combine the read information to form the absolute position information of the current position.

[0078] Please refer to Figures 8 and 9, where Figure 8 is a schematic diagram of the structure of the balancing structure in one embodiment of the present application, and Figure 9 is a schematic diagram of the exploded structure of the balancing structure in one embodiment of the present application. As shown in Figures 8 and 9, the balancing structure 32 includes a balancing assembly 321, a sleeve assembly 322, and a mounting assembly 323. The sleeve assembly 322 is sleeved on the second shaft assembly and fixed to the mounting assembly 323. The balancing assembly 321 is sleeved on the sleeve assembly 322 and fixedly connected to the external support structure, so that when the external support structure supports the rotation of the first arm component, it drives the balancing assembly 321 to rotate around the sleeve assembly 322 to generate torque, thereby balancing the center of gravity of the measuring device. In other words, the rotation of the balancing assembly 321 around the second shaft assembly 13 generates a torque that balances the change in the moment of the center of gravity of the measuring device. Furthermore, during the measurement work, the position of the articulated arm and the measuring device will change in space, thereby causing the center of gravity torque of the measuring equipment to change. Therefore, balancing the change of the center of gravity torque of the measuring equipment is to balance the change of the center of gravity torque caused by the change of the position of the articulated arm and the measuring device in space, so that the articulated arm and the measuring device are balanced and will not fall.

[0079] As shown in Figure 9, the sleeve assembly 322 includes a core shaft 3221. The core shaft 3221 is configured as a ring-shaped structure that is continuous from front to back and is sleeved on the second shaft assembly. The length of the core shaft 3221 is adapted to the length of the second shaft assembly. In one example, the length of the second shaft assembly is slightly longer than the core shaft 3221. When the core shaft 3221 is sleeved on the second shaft assembly, the second shaft assembly is located at the axis of the core shaft 3221 and is generally located at the center of the core shaft 3221.

[0080] In one embodiment, the sleeve assembly 322 further includes a core shaft fixing ring 3222, which is connected to the end face of the core shaft 3221 through a fixing member 3223 passing through the core shaft fixing ring 3222 to fix the core shaft 3221. In order to distinguish it from the fixing members that fix other positions later, in the embodiment, the fixing member that fixes the core shaft is also referred to as a first fixing member. In the embodiment shown in Figure 9, the number of the first fixing members 3223 is six, and the six first fixing members 3223 are evenly distributed on the end face of the core shaft fixing ring 3222. To match this, the end face of the core shaft 3221 is provided with six evenly distributed connection holes corresponding to the six first fixing members 3223. In some examples, the first fixing member 3223 can be, for example, a screw, and correspondingly, the connection hole can be configured as a screw hole.

[0081] The shape of the core shaft fixing ring 3222 includes but is not limited to a circle and a quasi-circular shape. As shown in Figure 9, the core shaft fixing ring 3222 is quasi-circular, and a rectangular protrusion is formed on its lower side. Three screw holes are provided on the rectangular protrusion. Specifically, the second fixing member 3224 is passed through the three screw holes on the rectangular protrusion on the lower side of the core shaft fixing ring 3222 to connect the core shaft fixing ring 3222 and the mounting assembly 323.

[0082] Please refer to Figures 2, 5, and 9. The balancing assembly 321 includes a torsion spring 3211 and a rotating connection portion 3212. The torsion spring 3211 is sleeved on the shaft sleeve assembly 322 and has a fixed end 32111 and a follower end 32112; the rotating connection portion 3212 is fixedly connected to the follower end 32112 and is fixedly connected to the outer support structure 31 to adjust the torque force of the torsion spring 3211 during the rotation of the outer support structure 31 so that the center of gravity of the measuring device is balanced.

[0083] In the embodiment shown in FIG9 , the rotating connection portion 3212 is configured as a rotating connection ring, which is sleeved with a torsion spring 3211 and connected to the shaft sleeve assembly 322 via a bearing structure 3213. Specifically, the rotating connection ring is provided with connection holes evenly distributed around its circumference. Pins or other types of fixing members can be inserted into the connection holes and fixed to the follower end 32112 of the torsion spring 3211 to achieve a fixed connection between the follower end 32112 and the rotating connection portion 3212.

[0084] In order to achieve the connection between the rotating connecting ring and the connecting component, in one embodiment, a lug is provided on the upper side of the rotating connecting ring, and a plurality of connecting holes are provided on the lug. Please refer to Figures 2, 5, and 9. Matchingly, the proximal end of the interior of the connecting component 312 is provided with a recess that fits with the lug. Specifically, the recess is provided on the outer surface of the second part 3122 of the connecting component, and a plurality of through holes are provided on the recess. The multiple through holes on the second part 3122 and the multiple connecting holes on the lug are connected by multiple fixing parts such as screws, thereby achieving the connection between the connecting component 312 and the rotating connecting ring.

[0085] In one embodiment, a spacer is provided between the rotating connecting ring and the torsion spring 3211 to prevent contamination. Specifically, the inner diameter of the rotating connecting ring can be configured to be slightly larger than the outer diameter of the torsion spring 3211. When the rotating connecting ring is fitted over the torsion spring 3211, the spacer is positioned between the rotating connecting ring and the torsion spring 3211. This spacer prevents contaminants such as grease from seeping out of the torsion spring 3211. The spacer also absorbs vibration from surrounding components and reduces the transmission of impact forces. Materials for the spacer include, but are not limited to, rubber, plastic, and metal to resist contamination in various environmental conditions.

[0086] In one embodiment, as shown in FIG9 , a stopper 32121 is disposed on the rotation connection portion 3212 to prevent the outer support structure 31 from rotating in the opposite direction. The stopper 32121 includes, but is not limited to, rubber, silicone, and composite materials, and has excellent elasticity and wear resistance. While preventing the outer support structure from rotating in the opposite direction, it also helps to reduce mechanical shock and vibration, thereby improving the stability of the measuring device.

[0087] To adjust the preload of the torsion spring, in one embodiment, the fixed end 32111 of the torsion spring 3211 is connected to a torsion spring fixing portion 3214, which is fixedly connected to the mounting assembly 323. Please refer to FIG10 in conjunction with FIG9 , which shows an exploded schematic diagram of the torsion spring fixing portion in one embodiment of the present application. As shown in FIG9 and FIG10 , the torsion spring fixing portion 3214 includes a preload adjustment portion 32141 and a fixing ring 32142. The preload adjustment portion 32141 is fixedly connected to the mounting assembly 323. The preload adjustment portion 32141 has a shape including, but not limited to, a circular or quasi-circular shape. A rectangular protrusion is formed on its underside, with three connecting holes provided on the end surface of the rectangular protrusion. Specifically, a third fixing member 3225 is inserted through the three connecting holes on the end surface of the rectangular protrusion on the underside of the preload adjustment portion 32141 to connect the preload adjustment portion 32141 to the mounting assembly 323. In some examples, the third fixing member 3225 may be, for example, a screw, and correspondingly, the connecting hole may be configured as a screw hole.

[0088] In one embodiment, the fixing ring 32142 is sleeved onto the fixed end 32111 of the torsion spring. Specifically, as shown in FIG9 , a fixing member 32113 can be provided on the fixed end 32111 of the torsion spring. The fixing ring 32142 is provided with a mounting groove. When the fixing ring 32142 is sleeved onto the fixed end 32111 of the torsion spring, the fixing member 32113 snaps into the mounting groove on the fixing ring 32142, connecting the fixing ring 32142 to the fixed end 32111. Furthermore, the fixing ring 32142 is positioned within the preload adjustment portion 32141 to secure the fixed end 32111. The preload adjustment portion 32141 can also push the fixing ring 32142 to adjust the preload angle of the torsion spring 32111.

[0089] In one embodiment, as shown in Figure 10 , the preload adjustment portion 32141 includes a preload adjustment ring 321411 and an adjustment member 321412. The fixing ring 32142 is provided with a protrusion 321421. The preload adjustment ring 321411 cooperates with a retaining ring 32143 to accommodate the fixing ring 32142. Please refer to Figure 11 in conjunction with Figure 10 , which shows a partially enlarged schematic diagram of the preload adjustment ring in the embodiment shown in Figure 10 of this application. As shown in Figures 10 and 11 , the preload adjustment ring 321411 is provided with an adjustment groove 321413. When the fixing ring 32142 is placed in the preload adjustment ring 321411, the protrusion 321421 disposed thereon is located within the adjustment groove 321413. Specifically, the adjusting member 321412 enters the adjusting groove 321413 through the adapted hole 321414 on the circumference of the preload adjusting ring 321411 to contact the protrusion 321421 , and the preload angle of the torsion spring 3211 is adjusted by rotating the adjusting member 321412 .

[0090] It should be understood that the fixing ring 32142 is fixedly connected to the fixed end 32111 of the torsion spring 3211 to secure the torsion spring 3211. When the adjusting member 321412 is rotated, the adjusting member 321412 contacts the protrusion 321421, thereby adjusting the tension of the torsion spring 3211. This applies a torque to the fixed end 32111 of the torsion spring 3211 to adjust the preload of the torsion spring 3211. For example, by rotating the adjusting member 321412, the depth to which the adjusting member 321412 enters the adjusting slot 321413 can be increased, thereby contacting the protrusion 321421 and driving the fixed end 32111 to rotate, thereby increasing the tension of the torsion spring 3211. The adjusting member 321412 can also be rotated to reduce the depth to which the adjusting member 321412 enters the adjusting slot 321413, thereby allowing space for the fixed end 32111 to rotate and release some of the tension in the torsion spring 3211, thereby achieving preload adjustment of the torsion spring 3211. In some examples, the depth of the adjusting slot 321413 is within a predetermined range to prevent the rated load capacity of the torsion spring from being exceeded during preload adjustment.

[0091] Please refer to Figures 12 and 13 , where Figure 12 is a schematic structural diagram of a mounting assembly in one embodiment of the present application, and Figure 13 is a schematic cross-sectional diagram of the mounting assembly in one embodiment of the present application. As shown in Figures 12 and 13 , the mounting assembly 323 includes a bearing structure 3231 and a connecting bracket 3232 . The bearing structure 3231 includes a bearing portion 32311 and a locking portion 32312 . The locking portion 32312 is disposed on the bearing portion 32311 . The bearing structure 3231 engages with the base via the locking portion 32312 to secure the bearing portion 32311 to the base.

[0092] Please refer to Figure 14 in conjunction with Figure 13 , which shows a partially enlarged schematic diagram of the mounting assembly in the embodiment shown in Figure 13 of the present application. As shown in Figure 14 , the bearing portion 32311 includes a bearing body 323111 and a bearing housing 323112. The inner ring provided on the bearing body 323111 is locked to the base via a locking portion 32312. The bearing housing 323112 is disposed on the outer ring of the bearing body 323111, and the connecting bracket 3232 is mounted on the bearing housing 323112, allowing the connecting bracket 3232 to rotate relative to the base. It should be noted that the inner ring of the bearing body 323111 refers to the inner portion near the center of the bearing body 323111, which is used to connect with the locking portion 32312. Correspondingly, the outer ring of the bearing body 323111 refers to the outer portion away from the center of the bearing body 323111, forming a circular ring with the inner ring, which is used to secure the connecting bracket, enabling stable rotation of the connecting bracket. In some examples, rolling elements such as balls are disposed between the inner ring and the outer ring to reduce friction between the inner ring and the outer ring.

[0093] Referring to Figures 9 and 12 , the connecting bracket 3232 is mounted on the bearing portion 32311 and connected to the balancing structure 32, so that the balancing structure 32 can rotate relative to the base. In the example shown in Figure 12 , the connecting bracket 3232 is configured as two symmetrically arranged brackets, including a first connecting bracket 32321 and a second connecting bracket 32322. The first connecting bracket 32321 includes a first rod-shaped structure and a first arc-shaped structure. A plurality of connecting holes are provided on the side end surface at the distal end of the first rod-shaped structure for the third fixing member 3225 to pass through to fix the torsion spring fixing portion 3214 to the first connecting bracket 32321. A first fixing structure is provided on the distal end surface of the first arc-shaped structure for fixing the first connecting bracket 32321 to the bearing portion 32311. Correspondingly, the second connecting bracket 32321 includes a second rod-shaped structure and a second arc-shaped structure. A plurality of connecting holes are provided on the side end face at the distal end of the second rod-shaped structure, for the second fixing member 3224 to pass through to fix the core shaft fixing ring 3222 to the second connecting bracket 32322. A second fixing structure is provided on the end face at the distal end of the second arc-shaped structure, for fixing the second connecting bracket 32322 to the bearing part 32311.

[0094] The following describes in detail the process of configuring the balancing mechanism disclosed in the embodiments of the present application on the measuring equipment to achieve center of gravity balance, in conjunction with Figures 1 to 14. First, the shaft sleeve assembly 322 is sleeved on the second shaft assembly 13 via the core shaft 3221 and fixed to the mounting assembly 323 via the core shaft fixing ring 3222. The balancing assembly 321 is sleeved on the shaft sleeve assembly 322 via the torsion spring 3211 and the rotating connection portion 3212 connected to the follower end 32112 of the torsion spring, and is fixedly connected to the second portion 3122 of the outer support structure 31 via the lug on the rotating connection portion 3212. This achieves the sleeved arrangement of the balancing structure 32 on the second shaft assembly 13 and the fixed connection between the balancing structure 32 and the outer support structure 31. Secondly, when the outer support structure 31 supports the rotation of the first arm component 10, the balancing assembly 321 rotates around the shaft sleeve assembly 322 through the rotating connection portion 3212 connected to the follower end 32112 of the torsion spring to generate torque, thereby balancing the changes in the center of gravity moment caused by the changes in the spatial positions of the first arm component 10, the second arm component 11, and the measuring device 2 during the measurement process. Then, while the balancing structure 32 is connected to the outer support structure 31, the support member 31122 is configured on the side wall of the connecting member 31121 to support the first arm component 10 in a point support manner, and is connected to the base 4 through the mounting assembly 323. Therefore, the force of the balancing structure 32, which is borne by the outer support structure 31, is further transferred to the base 4, avoiding deformation of the first arm component 10 of the measuring device due to force. Finally, the balancing structure 32 is sleeved on the second shaft assembly 13 corresponding to the first arm component 10 through the shaft sleeve assembly 322, and the balancing assembly 321 of the balancing structure 32 is sleeved on the shaft sleeve assembly 322 and connected to the external support structure 31, so that the balancing structure 32 is easy to disassemble and replace from the measuring equipment.

[0095] In summary, in order to overcome the technical problems in the related art that the articulated arm-type measuring equipment is difficult to replace during the measurement process and that the measurement accuracy is reduced due to the deformation of the arm part under force, the balancing mechanism of the measuring equipment and the measuring equipment provided in the present application are configured to include an external support structure and a balancing structure, wherein the external support structure is sleeved on the circumference of the arm member to support the arm member, and the balancing structure is connected to the external support structure and connected to the base of the measuring equipment, so that the external support structure bears the force of the balancing structure and further transfers it to the base, thereby avoiding the deflection deformation of the arm member of the measuring equipment. In addition, the balancing structure is sleeved on the shaft assembly corresponding to the arm member through its shaft sleeve assembly, and the balancing assembly of the balancing structure is sleeved on the shaft sleeve assembly and connected to the external support structure, so that the balancing structure is easy to detach and replace from the measuring equipment.

[0096] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical concepts disclosed in this application shall be covered by the claims of this application.

Claims

1. A balancing mechanism for a measuring device, characterized in that: The measuring device includes a base, at least one arm member, and a shaft assembly connected between the base and the arm member, and the balancing mechanism includes: an outer support structure disposed on a circumferential side of the arm member to support the arm member during rotation of the arm member around the shaft assembly; A balancing structure, sleeved on the shaft assembly, comprising a balancing assembly, a shaft sleeve assembly, and a mounting assembly connected to the base; Among them, the shaft sleeve assembly is sleeved on the shaft assembly and fixed on the mounting assembly, and the balancing assembly is sleeved on the shaft sleeve assembly and connected to the external support structure, so that the external support structure supports the arm component to rotate while driving the balancing assembly to rotate around the shaft sleeve assembly to generate torque, so that the center of gravity of the measuring device is balanced.

2. The balancing mechanism of the measuring device according to claim 1, characterized in that: The outer support structure comprises: an arm support assembly, disposed around the arm member to support the arm member; A connecting assembly is connected between the arm support assembly and the balancing structure to achieve a fixed connection between the balancing structure and the outer supporting structure.

3. The balancing mechanism of the measuring device according to claim 2, characterized in that: The arm support assembly comprises: an outer sleeve, non-contactly sleeved on the arm member, with a proximal end connected to the connecting assembly; The arm support portion is configured at the distal end of the outer tube, and supports the arm member when the arm member is placed in the outer tube.

4. The balancing mechanism of the measuring device according to claim 3, characterized in that: The arm support portion includes a coupling and a support. The coupling is adapted to the outer sleeve to be connected to the distal end of the outer sleeve. The support is arranged on the side wall of the coupling to support the arm member in a point support or line support manner.

5. The balancing mechanism of the measuring device according to claim 4, characterized in that: There are at least two supporting members.

6. The balancing mechanism of the measuring device according to claim 4, characterized in that: The support member is configured as a roller.

7. The balancing mechanism of the measuring device according to claim 4, characterized in that: Two adjacent support members are distributed at an angle of 120°.

8. The balancing mechanism of the measuring device according to claim 2, characterized in that: The connecting assembly includes a first portion and a second portion that are adapted to each other, and the first portion and the second portion are tightly clamped to the proximal end of the arm support assembly.

9. The balancing mechanism of the measuring device according to claim 1, characterized in that: When the balancing structure is sleeved on the shaft assembly, there is a circumferential gap between the balancing structure and the shaft assembly.

10. The balancing mechanism of the measuring device according to claim 1, characterized in that: The shaft sleeve assembly includes a core shaft, and the core shaft is configured as a ring structure that penetrates front and back to be sleeved on the shaft assembly.

11. The balancing mechanism of the measuring device according to claim 10, characterized in that: The sleeve assembly also includes a core shaft fixing ring fixedly connected to the mounting assembly, and a fixing member passes through the core shaft fixing ring and is connected to the end surface of the core shaft to fix the core shaft.

12. The balancing mechanism of the measuring device according to claim 1, characterized in that: The balancing component includes: a torsion spring, sleeved on the shaft sleeve assembly, having a fixed end and a follower end opposite to each other, the fixed end being connected to a torsion spring fixing portion, and the torsion spring fixing portion being fixedly connected to the mounting assembly; The rotating connection portion is fixedly connected to the follower end of the torsion spring and is also fixedly connected to the outer support structure to adjust the torque of the torsion spring during the rotation of the outer support structure to balance the center of gravity of the measuring device.

13. The balancing mechanism of the measuring device according to claim 12, characterized in that: The rotating connection portion is configured as a rotating connection ring, which is sleeved on the torsion spring and connected to the shaft sleeve assembly through a bearing structure.

14. The balancing mechanism of the measuring device according to claim 13, characterized in that: An isolation sheet is also provided between the rotating connecting ring and the torsion spring to prevent contamination.

15. The balancing mechanism of the measuring device according to claim 12, characterized in that: A limiting member is disposed on the rotating connection portion to prevent the outer supporting structure from rotating in the opposite direction.

16. The balancing mechanism of the measuring device according to claim 12, characterized in that: The torsion spring fixing portion can also be used to pre-tighten the torsion spring, and the torsion spring fixing portion includes: a preload adjustment portion, fixedly connected to the mounting assembly; A fixing ring is sleeved on the fixed end of the torsion spring and is connected to the fixed end by a fixing piece that is snapped into the mounting groove on the fixing ring. The fixing ring is also positioned in the preload adjustment portion so that the fixed end is fixed. The preload adjustment portion can also push the fixing ring to adjust the preload angle of the torsion spring.

17. The balancing mechanism of the measuring device according to claim 16, characterized in that: The preload adjustment unit includes: A preload adjustment ring cooperates with a retaining ring to accommodate the fixing ring, wherein an adjustment groove is provided in the preload adjustment ring, and when the fixing ring is placed in the preload adjustment ring, a protrusion provided on the fixing ring is located in the adjustment groove; The adjusting member enters the adjusting groove through the adapted hole on the circumferential side of the preload adjustment ring to contact the protrusion, and is used to adjust the preload angle of the torsion spring by rotation.

18. The balancing mechanism of the measuring device according to claim 1, characterized in that: The installation components include: A bearing structure comprising a bearing portion and a locking portion disposed on the bearing portion, wherein the locking portion cooperates with the base to lock the bearing portion on the base; A connecting bracket is mounted on the bearing portion and connected to the balancing structure so that the balancing structure can rotate relative to the base.

19. The balancing mechanism of the measuring device according to claim 18, characterized in that The bearing portion includes a bearing body and a bearing shell, the inner ring of the bearing body is locked on the base through a locking portion, the bearing shell is arranged on the outer ring of the bearing body and the connecting bracket is installed on the bearing shell so that the connecting bracket can rotate relative to the base.

20. A measuring device comprising a base, an articulated arm connected to the base, and a measuring device disposed at a distal end of the articulated arm, wherein: The articulated arm includes a shaft assembly disposed at a proximal end thereof and an arm member connected to the shaft assembly. The measuring device further includes a balancing mechanism as claimed in any one of claims 1 to 19.

21. The measuring device according to claim 20, characterized in that The measuring device is a three-coordinate measuring machine.

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