Inner diameter measuring device

Abstract

The invention belongs to the technical field of inner diameter detection, and particularly relates to an inner diameter measuring device, the inner diameter measuring device comprises a fixing assembly and a measuring assembly, the fixing assembly comprises a connecting rod, and a first fixing unit and a second fixing unit connected to two ends of the connecting rod; the measuring assembly comprises a mounting seat, a first driving unit, a second driving unit, a first laser distance measuring part and a second laser distance measuring part, and the mounting seat is located between the first fixing unit and the second fixing unit; the first driving unit is connected with the fixing assembly and used for driving the mounting base to move in the axial direction of the connecting rod. The first laser distance measuring part is connected with the mounting seat and is used for measuring the distance between the second fixing unit and the mounting seat; the second driving unit is connected with the mounting base, and the second driving unit is connected with the second laser distance measuring part and used for driving the second laser distance measuring part to rotate around the axis of the inner hole; the second laser distance measuring piece is used for measuring the distance between the inner wall face of the inner hole and the second laser distance measuring piece, and the diameter of the inner hole can be conveniently and rapidly measured.

Description

Technical Field

[0001] This application belongs to the technical field of inner diameter detection, and particularly relates to an inner diameter measuring device. Background Art

[0002] During the maintenance of some equipment, the inner diameters of multiple positions of the inner holes of some components are usually detected to ensure the accuracy and reliability of the equipment operation; for example: in a nuclear power plant, pipelines are usually controlled by valves, and the valves are opened and closed under the operation of a driving mechanism to achieve the mechanized control of the pipelines. The driving mechanism includes a hydraulic cylinder, and the valve stem is driven by the hydraulic cylinder to move to open and close the valve; after long-term use of the hydraulic cylinder, problems such as micro-deformation and wear may occur, which may affect the opening and closing amplitude of the valve. Therefore, in order to improve the accuracy of valve opening and closing, it is usually necessary to measure the inner diameters of different positions of the cylinder body of the hydraulic cylinder. How to improve the measurement accuracy and measurement efficiency is an important research content.

[0003] The above statements are only used to provide background technical information related to this application, and do not necessarily constitute prior art. Summary of the Invention

[0004] The purpose of the embodiments of this application is to provide an inner diameter measuring device that can improve the efficiency and accuracy of inner diameter detection.

[0005] The technical solution adopted in the embodiments of this application is:

[0006] To achieve the above purpose, the technical solution adopted in the embodiments of this application is: an inner diameter measuring device, including a fixing component and a measuring component. The fixing component includes a connecting rod, a first fixing unit, and a second fixing unit. The two ends of the connecting rod are respectively connected to the first fixing unit and the second fixing unit; the first fixing unit is used to be fixed at one end of the inner hole of the component to be measured; the second fixing unit is used to be fixed at the other end of the inner hole of the component to be measured; the measuring component includes a mounting seat, a first driving unit, a second driving unit, a first laser rangefinder, and a second laser rangefinder. The mounting seat is located between the first fixing unit and the second fixing unit; the first driving unit is connected to the fixing component, and the first driving unit is used to drive the mounting seat to move along the axial direction of the connecting rod; the first laser rangefinder is connected to the mounting seat, and the first laser rangefinder is used to measure the distance between the second fixing unit and the mounting seat; the second driving unit is connected to the mounting seat, the second driving unit is connected to the second laser rangefinder, and the second driving unit is used to drive the second laser rangefinder to rotate around the axis of the inner hole; the second laser rangefinder is used to measure the distance between the inner wall surface of the inner hole and the second laser rangefinder.

[0007] Optionally, the first driving unit includes a first rotary driving member, a first transmission mechanism, and a lead screw. The first rotary driving member is connected to the fixing component. The first rotary driving member is connected to the lead screw through the first transmission mechanism to drive the lead screw to rotate about its own axis. The lead screw is arranged parallel and spaced from the connecting rod. The lead screw passes through the mounting seat, and the mounting seat is screwed to the lead screw.

[0008] Optionally, the second driving unit includes a second rotary driving member, a second transmission mechanism, and a rotating seat. The second rotary driving member is connected to the mounting seat. The rotating seat is rotatably connected to the mounting seat. The second laser ranging member is fixedly connected to the rotating seat. The second rotary driving member is connected to the rotating seat through the second transmission mechanism to drive the rotating seat to rotate about the axis of the inner hole.

[0009] Optionally, the axis of the connecting rod is used to coincide with the axis of the inner hole.

[0010] Optionally, the first fixing unit includes a first fixing seat, a first driving member, a first moving member, and at least three first abutting members. The first driving member, the first moving member, and a plurality of first abutting members are arranged on the first fixing seat. The plurality of first abutting members are circumferentially spaced along the first moving member. The first driving member is connected to the first moving member. The first driving member is used to drive the first moving member to move along the axis of the connecting rod, thereby driving the plurality of first abutting members to move towards the inner wall surface of the inner hole so that the plurality of first abutting members can abut against the inner wall surface of the inner hole.

[0011] Optionally, the outer peripheral surface of the first moving member is a first inclined surface, and the first abutting member has a second inclined surface adapted to the first inclined surface.

[0012] Optionally, the first fixing unit further includes a first elastic member. The first elastic member is arranged between the first fixing seat and the first abutting member. The first elastic member is used to push the second inclined surface to abut against the first inclined surface.

[0013] Optionally, the second fixing unit includes a second fixing seat, a second driving member, a second moving member, and at least three second abutting members. The second driving member, the second moving member, and a plurality of second abutting members are arranged on the second fixing seat. The plurality of second abutting members are circumferentially spaced along the second moving member. The second driving member is connected to the second moving member. The second driving member is used to drive the second moving member to move, thereby driving the plurality of second abutting members to move towards the inner wall surface of the inner hole so that the plurality of second abutting members can abut against the inner wall surface of the inner hole.

[0014] Optionally, the first moving member is sleeved outside the first driving member and is screwed to the first driving member; the second moving member is sleeved outside the second driving member and is screwed to the second driving member.

[0015] Optionally, the fixing component includes a third rotation driving member. The first driving member and the second driving member are respectively connected to two ends of the connecting rod. The first driving member, the second driving member and the connecting rod are coaxially arranged. The first driving member, the second driving member and the connecting rod are of an integrated structure and jointly form a central rod. The third rotation driving member is connected to the central rod and is used to drive the central rod to rotate around its own axis.

[0016] One or more of the above technical solutions in the inner diameter measuring device provided by the embodiments of the present application have at least one of the following technical effects: when the inner diameter measuring device is in use, the connecting rod is inserted into the inner hole, the first fixing unit is fixed at one end of the inner hole, and the second fixing unit is fixed at the other end of the inner hole. While the first driving unit drives the mounting seat to move axially along the connecting rod, the first laser ranging member measures the distance between the first laser ranging member and the second fixing unit, so as to obtain whether the mounting seat moves to a preset height; when the mounting seat moves to the preset height, the second driving unit drives the second laser ranging member to rotate, so as to obtain the diameter of the inner hole at the preset height, thus completing the inner hole measurement of the inner hole at the preset position; in this process, by using the first laser ranging member and the second laser ranging member for measurement, the accuracy of laser measurement is good, which can improve the accuracy of inner hole diameter measurement; the first driving unit can drive the mounting seat to move axially along the connecting rod, and the diameter values at more heights can be measured. Moreover, the second driving unit drives the second laser ranging member to rotate, and at the same preset height, more diameter data can also be measured. More data is measured, which improves the accuracy of inner hole detection; in addition, during the measurement process, the first fixing unit and the second fixing unit are fixed in the inner hole, and the detection operation can be realized by starting the first driving unit and the second driving unit. The operation is simple and the detection efficiency is improved.

[0017] The above description is only an overview of the technical solutions of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specific embodiments of the present application are specifically given. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a cross-sectional view of an inner diameter measuring device provided by some embodiments of the present application.

[0020] Figure 2 For Figure 1Partial enlarged view at A in [the figure].

[0021] Figure 3 is the sectional view along Figure 1 section line B - B in [the figure].

[0022] Figure 4 is the sectional view along Figure 1 partial enlarged view at C in [the figure].

[0023] Figure 5 is the sectional view along Figure 1 partial enlarged view at D in [the figure].

[0024] Among them, each reference numeral in the figure:

[0025] 1. Inner diameter measuring device; 11. Fixing assembly; 111. Connecting rod; 112. First fixing unit; 1121. First fixing seat; 11211. First accommodating cavity; 11212. First through hole; 1122. First driving member; 1123. First moving member; 11231. First inclined surface; 1124. First abutting member; 11241. Second inclined surface; 1125. First elastic member; 1126. First mounting rod; 113. Second fixing unit; 1131. Second fixing seat; 11311. Second accommodating cavity; 11312. Second through hole; 1132. Second driving member; 1133. Second moving member; 11331. Third inclined surface; 1134. Second abutting member; 11341. Fourth inclined surface; 1135. Second elastic member; 1136. Second mounting rod; 114. Third rotary driving member; 115. Central rod; 12. Measuring assembly; 121. Mounting seat; 1211. Light-transmitting hole; 1212. Sliding sleeve; 1213. Nut; 122. First driving unit; 1221. First rotary driving member; 1222. First transmission mechanism; 1223. Lead screw; 123. Second driving unit; 1231. Second rotary driving member; 1232. Second transmission mechanism; 1233. Rotating seat; 124. First laser distance measuring member; 125. Second laser distance measuring member; 13. Guide assembly; 131. Guide rod; 132. Guide sleeve; 2. Cylinder block; 21. Inner hole; 22. Inner wall surface; 23. Step surface. Detailed implementation manners

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0027] In the description of the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features.

[0028] In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0029] In the present application, unless otherwise clearly specified and defined, terms such as "installed", "connected", "coupled", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal connection of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0030] In the present application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0031] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "inside", "outside", "side", "top", "bottom", "front", "rear", etc. is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the indicated device or component must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0032] In the description of the present application, it should be noted that the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone.

[0033] It should also be noted that in the embodiments of the present application, the same reference numerals are used to represent the same components or the same parts. For the same parts in the embodiments of the present application, only one of the parts or components may be marked with a reference numeral in the figure. It should be understood that the reference numerals are equally applicable to other identical parts or components.

[0034] During the maintenance of some devices, the inner diameters at multiple positions of the inner holes of some components are usually measured to ensure the accuracy and reliability of the device operation. For example, in a nuclear power plant, pipelines are usually controlled by valves, and the valves are opened and closed under the operation of a driving mechanism to achieve the mechanized control of the pipelines. The driving mechanism includes a hydraulic cylinder, and the hydraulic cylinder is used to drive the valve stem to move to open and close the valve. After long-term use, the hydraulic cylinder may have problems such as micro-deformation and wear, which will affect the opening and closing amplitude of the valve. Therefore, in order to improve the accuracy of valve opening and closing, it is usually necessary to measure the inner diameters at different positions of the cylinder body of the hydraulic cylinder.

[0035] In some cases, a tape measure is used as a height scale, and an internal diameter dial indicator is used to measure the inner diameters at different height positions of the cylinder body. When measuring the inner diameter at the same height of the cylinder body, the internal diameter dial indicator measures 1 data every 45 degrees of rotation, and 8 groups of data need to be measured at the same height. Among them, using a tape measure as a height scale and observing the required height with the naked eye to measure the inner diameter has low accuracy and cannot ensure that all 8 groups of data are at the same height data. When measuring, 8 groups of data need to be measured at the same height using the internal diameter dial indicator, which takes a long time and has low measurement efficiency. The cylinder body of the hydraulic cylinder is relatively deep, and the limitation of using the internal diameter dial indicator for measurement is large and it is inconvenient to use. At the same time, personnel need to stand on the bracket of a platform at a certain height to measure, and there is a risk of falling for personnel, and the measurement safety is poor. It can be seen that the inner diameter measurement method at different heights of the cylinder body has problems such as low accuracy of measurement results, low measurement efficiency, and poor measurement safety.

[0036] The inner diameter measurement device of the embodiment of the present application uses the method of laser ranging to accurately determine the measurement height. At the same time, it can also accurately measure the diameter of the inner hole, improving the measurement accuracy. In addition, when measuring the diameter of the inner hole, only need to fix the inner diameter measurement device in the inner hole of the component to be measured, then the mechanized measurement of the inner diameter can be realized, improving the measurement efficiency. In addition, personnel do not need to climb to a high place for measurement, improving the measurement safety.

[0037] The following combines Figures 1 to 5 to illustrate the inner diameter measurement device 1 of the embodiment of the present application.

[0038] Refer to Figure 1 and Figure 2As shown in the figure, the inner diameter measuring device 1 includes a fixing assembly 11 and a measuring assembly 12. The fixing assembly 11 includes a connecting rod 111, a first fixing unit 112, and a second fixing unit 113. The two ends of the connecting rod 111 are respectively connected to the first fixing unit 112 and the second fixing unit 113. The first fixing unit 112 is used to be fixed at one end of the inner hole 21 of the component to be measured. The second fixing unit 113 is used to be fixed at the other end of the inner hole 21 of the component to be measured. The measuring assembly 12 includes a mounting base 121, a first driving unit 122, a second driving unit 123, a first laser distance measuring member 124, and a second laser distance measuring member 125. The mounting base 121 is located between the first fixing unit 112 and the second fixing unit 113. The first driving unit 122 is connected to the fixing assembly 11, and the first driving unit 122 is used to drive the mounting base 121 to move along the axial direction Z of the connecting rod 111. The first laser distance measuring member 124 is connected to the mounting base 121, and the first laser distance measuring member 124 is used to measure the distance between the second fixing unit 113 and the mounting base 121. The second driving unit 123 is connected to the mounting base 121, and the second driving unit 123 is connected to the second laser distance measuring member 125. The second driving unit 123 is used to drive the second laser distance measuring member 125 to rotate around the axis M of the inner hole 21. The second laser distance measuring member 125 is used to measure the distance between the inner wall surface 22 of the inner hole 21 and the second laser distance measuring member 125.

[0039] The component to be measured can refer to components such as a pipeline with an inner hole 21 or the cylinder block 2 of a hydraulic cylinder. For the convenience of description, the following takes the inner diameter measurement of the cylinder block 2 of a hydraulic cylinder as an example. The inner hole 21 of the cylinder block 2 can refer to the cavity for accommodating the piston. During measurement, the cylinder block 2 is arranged vertically. Of course, in other examples, during measurement, the cylinder block 2 can also be placed horizontally, obliquely, etc.

[0040] The fixing assembly 11 can refer to the component used to fix the inner diameter measuring device 1 on the cylinder block 2.

[0041] The fixing assembly 11 includes a connecting rod 111, a first fixing unit 112, and a second fixing unit 113. The first fixing unit 112 is fixed at one end of the inner hole 21, and the second fixing unit 113 is fixed at the other end of the inner hole 21. The connecting rod 111 is used to connect the first fixing unit 112 and the second fixing unit 113.

[0042] The first fixing unit 112 can be fixed inside the inner hole 21 or outside the inner hole 21. The first fixing unit 112 and the cylinder block 2 can adopt fixing connection methods such as clamping, abutting, or fasteners (such as bolts, screws, etc.).

[0043] The second fixing unit 113 can be fixed inside the inner hole 21 or outside the inner hole 21. The second fixing unit 113 and the cylinder block 2 can adopt fixing connection methods such as snap connection, abutting connection or fasteners (e.g., bolts, screws, etc.).

[0044] The connecting rod 111 is used to connect the first fixing unit 112 and the second fixing unit 113 into a whole, which is convenient for the installation of the fixing component 11 and also convenient for the measurement of the measuring component 12.

[0045] The measuring component 12 is used to measure the diameters of the inner hole 21 at different heights.

[0046] The measuring component 12 includes a mounting base 121, a first driving unit 122, a second driving unit 123, a first laser rangefinder 124 and a second laser rangefinder 125.

[0047] The mounting base 121 can refer to the mounting base of the second driving unit 123, the first laser rangefinder 124 and the second laser rangefinder 125, and plays a role in supporting the second driving unit 123, the first laser rangefinder 124 and the second laser rangefinder 125.

[0048] The mounting base 121 is located between the first fixing unit 112 and the second fixing unit 113. The first laser rangefinder 124 and the second laser rangefinder 125 are also located between the first fixing unit 112 and the second fixing unit 113. The first laser rangefinder 124 and the second laser rangefinder 125 can measure the diameter of the inner hole 21 between the first fixing unit 112 and the second fixing unit 113.

[0049] The first driving unit 122 can refer to a component used to drive the mounting base 121 to move along the axial direction Z of the connecting rod 111. The first driving unit 122 can be a pneumatic cylinder or an electric telescopic mechanism, etc. The first driving unit 122 can drive the mounting base 121 to move between the first fixing unit 112 and the second fixing unit 113, so as to measure the diameters of different heights of the inner hole 21, which is beneficial to obtaining more measurement data and improving the measurement accuracy.

[0050] The second driving unit 123 can refer to a component used to drive the second laser rangefinder 125 to rotate around the axis M of the inner hole 21.

[0051] Both the first laser rangefinder 124 and the second laser rangefinder 125 are laser rangefinder components that use laser to measure distance. The laser rangefinder component emits a laser beam and receives the reflected light, calculates the time or phase difference of the laser from emission to reflection and return, so as to accurately measure the distance between the target object and the laser rangefinder component.

[0052] The first laser distance measuring component 124 is arranged facing the second fixing unit 113. By emitting laser light and receiving the reflected light, the distance from the first laser distance measuring component 124 to the reflecting surface of the second fixing unit 113 is measured. The mounting base 121 is fixedly connected to the first laser distance measuring component 124, and the mounting base 121 and the first laser distance measuring component 124 are relatively fixed. Then, according to the distance obtained by the first laser distance measuring component 124, the distance between the mounting base 121 and the second fixing unit 113 can be obtained.

[0053] During measurement, the second fixing unit 113 is fixed relative to the cylinder block 2, and the position information of the second fixing unit 113 on the cylinder block 2 can be calculated. According to this position information and the distance measured by the first laser distance measuring component 124, the height information of the mounting base 121 in the inner hole 21 can be obtained.

[0054] Exemplarily, a stepped surface 23 is provided at one end of the inner hole 21, and the second fixing unit 113 abuts against the stepped surface 23, realizing the axial fixation of the second fixing unit 113 in the inner hole 21. Taking the stepped surface 23 as a reference, according to the distance measured by the first laser distance measuring component 124, the height information of the mounting base 121 in the inner hole 21 can be accurately obtained.

[0055] The second laser distance measuring component 125 is arranged facing the inner wall surface 22 of the inner hole 21. The second laser distance measuring component 125 emits laser light to the inner wall surface 22 of the inner hole 21 and receives the reflected light, and thus the distance between the second laser distance measuring component 125 and the inner wall surface 22 of the inner hole 21 can be obtained.

[0056] The second laser distance measuring component 125 is installed on the mounting base 121, and the distance between the second laser distance measuring component 125 and the axis M of the inner hole 21 can be calculated.

[0057] When the second driving unit 123 drives the second laser distance measuring component 125 to rotate around the axis M of the inner hole 21, the second laser distance measuring component 125 can obtain a plurality of distance values between the second laser distance measuring component 125 and the inner wall surface 22 of the inner hole 21 along the circumferential direction of the inner hole 21. According to the plurality of distance values and the distance between the second laser distance measuring component 125 and the axis M of the inner hole 21, the diameter of the inner hole 21 can be obtained; at the same time, through the calculation and analysis of the plurality of distance values, a more accurate diameter of the inner hole 21 can also be obtained, which is beneficial to improving the accuracy of the diameter measurement of the inner hole 21.

[0058] For the inner diameter measuring device 1 according to the embodiment of the present application, during use, the connecting rod 111 is inserted into the inner hole 21. The first fixing unit 112 is fixed at one end of the inner hole 21, and the second fixing unit 113 is fixed at the other end of the inner hole 21. While the first driving unit 122 drives the mounting seat 121 to move along the axial direction Z of the connecting rod 111, the first laser ranging component 124 measures the distance between the first laser ranging component 124 and the second fixing unit 113, so as to obtain whether the mounting seat 121 has moved to a preset height. When the mounting seat 121 moves to the preset height, the second driving unit 123 drives the second laser ranging component 125 to rotate, so as to obtain the diameter of the inner hole 21 at the preset height. In this way, the measurement of the inner hole 21 at the preset position is completed. During this process, by using the first laser ranging component 124 and the second laser ranging component 125 for measurement, the accuracy of laser measurement is good, which can improve the accuracy of the inner hole 21 diameter measurement. The first driving unit 122 can drive the mounting seat 121 to move along the axial direction Z of the connecting rod 111, and the diameter values at multiple heights can be measured. Moreover, the second driving unit 123 drives the second laser ranging component 125 to rotate, and at the same preset height, multiple diameter data can also be measured. More data is measured, which improves the accuracy of the inner hole 21 detection. In addition, during the measurement process, the first fixing unit 112 and the second fixing unit 113 are fixed in the inner hole 21, and the detection operation can be realized by starting the first driving unit 122 and the second driving unit 123. The operation is simple and the detection efficiency is improved.

[0059] In some embodiments, the inner diameter measuring device 1 includes a controller, and the controller is electrically connected to the first laser ranging component 124, the second laser ranging component 125, the first driving unit 122, the second driving unit 123, the first fixing unit 112 and the second fixing unit 113 to realize the automatic measurement and remote control of the inner diameter.

[0060] In some embodiments, the inner diameter measuring device 1 is used to accurately measure the inner cylinder diameter of the hydraulic cylinder of the main steam isolation valve drive mechanism at different heights, and judge whether there is micro-deformation and excessive wear of the hydraulic cylinder according to the high-precision measurement data, so as to judge the usability and analyze the wear degree. By using laser measurement, the measurement is convenient and the limitation is small; multiple groups of data can be measured, the accuracy is relatively high, and the validity of the measured data is good; multiple groups of data can be measured in a short time, and the measurement efficiency is high; it can be remotely controlled to avoid personal risks and the measurement safety is high.

[0061] In some embodiments, the first laser distance measuring member 124 is disposed on the side of the mounting base 121 facing away from the second fixing unit 113. The first laser distance measuring member 124 is arranged parallel to the connecting rod 111, and the emitting end of the first laser distance measuring member 124 faces the second fixing unit 113. The mounting base 121 is provided with a light-transmitting hole 1211, and the light-transmitting hole 1211 is disposed opposite to the emitting end of the first laser distance measuring member 124. The laser emitted by the first laser distance measuring member 124 passes through the light-transmitting hole 1211 and irradiates on the second fixing unit 113, thereby realizing laser measurement. The second laser distance measuring member 125 and the second driving unit 123 are located on the side of the mounting base 121 facing away from the second fixing unit 113, and the components are mounted on the same side of the mounting base 121, which facilitates the assembly of the components.

[0062] In other embodiments, the first laser distance measuring member 124 can be mounted on the side of the mounting base 121 facing the second fixing unit 113. The second laser distance measuring member 125 and the second driving unit 123 can also be mounted on the side of the mounting base 121 facing the second fixing unit 113.

[0063] In some embodiments, the first driving unit 122 includes a first rotation driving member 1221, a first transmission mechanism 1222, and a lead screw 1223. The first rotation driving member 1221 is connected to the fixing assembly 11, and the first rotation driving member 1221 is connected to the lead screw 1223 through the first transmission mechanism 1222 to drive the lead screw 1223 to rotate about its own axis. The lead screw 1223 is arranged parallel and spaced apart from the connecting rod 111. The lead screw 1223 passes through the mounting base 121, and the mounting base 121 is screwed to the lead screw 1223.

[0064] The first rotation driving member 1221 can refer to a component capable of outputting a rotational driving force, such as a motor, a motor, etc. The first rotation driving member 1221 can be mounted on the first fixing unit 112, the second fixing unit 113, or the connecting rod 111.

[0065] The first transmission mechanism 1222 can refer to a component capable of transmitting the rotational power output by the first rotation driving member 1221 to the lead screw 1223 for driving the lead screw 1223 to rotate about its own axis. The first transmission mechanism 1222 can be a gear transmission mechanism, a chain transmission mechanism, a synchronous belt transmission mechanism, etc.

[0066] The lead screw 1223 is provided with an external thread, and the mounting base 121 is provided with a threaded hole. The lead screw 1223 is inserted into the threaded hole of the mounting base 121, and the external thread of the lead screw 1223 meshes with the internal thread of the threaded hole.

[0067] Exemplarily, the mounting base 121 is provided with a nut 1213, and the inner hole 21 of the nut 1213 forms the threaded hole of the mounting base 121. With this setting, the structure is simple and the processing and manufacturing are convenient.

[0068] In use, the first rotation driving member 1221 transmits the rotational driving force to the lead screw 1223 through the first transmission mechanism 1222. The lead screw 1223 rotates, and the mounting seat 121 moves along the axial direction of the lead screw 1223. The connecting rod 111 is arranged parallel and spaced apart from the lead screw 1223, and the mounting seat 121 moves along the axial direction Z of the connecting rod 111, that is, the height adjustment of the mounting seat 121 within the inner hole 21 is realized.

[0069] By adopting the technical solution of this embodiment, on the one hand, the first driving unit 122 adopts the structure of the first rotation driving member 1221, the first transmission mechanism 1222 and the lead screw 1223, and its structure is simple and convenient for processing and manufacturing; on the other hand, the setting of the first transmission mechanism 1222 can change the power transmission direction, making the layout of the first rotation driving member 1221 and the lead screw 1223 more flexible, which is beneficial to improving the compactness of the inner diameter measuring device 1. The inner diameter measuring device 1 has good compactness and can better meet the measurement requirements of the inner hole 21.

[0070] In some embodiments, the second driving unit 123 includes a second rotation driving member 1231, a second transmission mechanism 1232 and a rotating seat 1233. The second rotation driving member 1231 is connected to the mounting seat 121, the rotating seat 1233 is rotatably connected to the mounting seat 121, the second laser distance measuring member 125 is fixedly connected to the rotating seat 1233, and the second rotation driving member 1231 is connected to the rotating seat 1233 through the second transmission mechanism 1232 to drive the rotating seat 1233 to rotate around the axis M of the inner hole 21.

[0071] The second rotation driving member 1231 may refer to a component capable of outputting rotational power. The rotational power output by the second rotation driving member 1231 is used to drive the rotating seat 1233 to rotate around the axis M of the inner hole 21. The second rotation driving member 1231 may be a component such as a motor or a motor.

[0072] The second transmission mechanism 1232 may refer to a component capable of transmitting the rotational power output by the second rotation driving member 1231 to the rotating seat 1233 to drive the rotating seat 1233 to rotate around the axis M of the inner hole 21. The second transmission mechanism 1232 may be a gear transmission mechanism, a chain transmission mechanism, a synchronous belt transmission mechanism, etc.

[0073] The rotating seat 1233 may be a component that rotates relative to the mounting seat 121, and the rotating seat 1233 is rotatably connected to the mounting seat 121. The second laser distance measuring member 125 is installed on the rotating seat 1233. The rotating seat 1233 rotates around the axis M of the inner hole 21, and the second laser distance measuring member 125 also rotates around the axis M of the inner hole 21, thereby realizing the diameter measurement of the inner hole 21.

[0074] By adopting the technical solution of this embodiment, on the one hand, the second driving unit 123 adopts the structure of the second rotary driving member 1231, the second transmission mechanism 1232 and the rotating seat 1233, which has a simple structure and is convenient for processing and manufacturing; on the other hand, the setting of the second transmission mechanism 1232 can change the power transmission direction, making the layout of the second rotary driving member 1231 and the rotating seat 1233 more flexible, which is beneficial to improving the compactness of the inner diameter measuring device 1. The inner diameter measuring device 1 has good compactness and can better meet the measurement requirements of the inner hole 21.

[0075] In some embodiments, the axis of the connecting rod 111 is used to coincide with the axis M of the inner hole 21.

[0076] During measurement, the axis of the connecting rod 111 coincides with the axis M of the inner hole 21. Of course, during actual measurement, due to the influence of factors such as installation errors, the axis of the connecting rod 111 may be approximately coincident with the axis M of the inner hole 21.

[0077] By adopting the technical solution of this embodiment, the axis of the connecting rod 111 coincides with the axis M of the inner hole 21, making the connecting rod 111 a mounting reference for the second driving unit 123 and the second laser ranging member 125, which is beneficial to reducing the installation error between components and improving the measurement accuracy.

[0078] In some embodiments, the connecting rod 111 passes through the mounting seat 121. The mounting seat 121 is provided with a sliding sleeve 1212. The sliding sleeve 1212 is sleeved outside the connecting rod 111. The connecting rod 111 can play a guiding role in the movement of the mounting seat 121 and improve the stability of the movement of the mounting seat 121.

[0079] In some embodiments, the rotating seat 1233 is sleeved outside the sliding sleeve 1212. A bearing is installed between the rotating seat 1233 and the sliding sleeve 1212. Through the rotation of the bearing, the rotation of the rotating seat 1233 around the axis of the connecting rod 111 is smoother, improving the accuracy of the inner diameter measurement of the inner hole 21.

[0080] Refer to Figure 3 As shown, in some embodiments, the inner diameter measuring device 1 further includes a guiding assembly 13. The guiding assembly 13 includes a guiding rod 131 and a guiding sleeve 132. The guiding sleeve 132 is installed on the mounting seat 121. Both ends of the guiding rod 131 are respectively connected to the first fixing unit 112 and the second fixing unit 113. The guiding sleeve 132 is sleeved outside the guiding rod 131. Through the guiding action of the guiding rod 131 and the guiding sleeve 132, it is beneficial to improve the stability of the movement of the mounting seat 121. In addition, both ends of the guiding rod 131 are respectively connected to the first fixing unit 112 and the second fixing unit 113, which is beneficial to improving the connection reliability between the first fixing unit 112 and the second fixing unit 113 and improving the use stability of the inner diameter measuring device 1.

[0081] In some embodiments, the number of the guiding components 13 can be multiple, and the multiple guiding components 13 are circumferentially and spaced apart around the connecting rod 111; for example, the number of the guiding components 13 is two, and the guiding sleeves 132 and nuts 1213 of the two guiding components 13 are circumferentially and spaced apart around the connecting rod 111 and are distributed in a triangular shape. With such a distribution, the components are regularly distributed, which is beneficial to improving the structural reliability and the use reliability of the device.

[0082] In some embodiments, referring to Figure 4 As shown, the first fixing unit 112 includes a first fixing seat 1121, a first driving member 1122, a first moving member 1123, and at least three first abutting members 1124. The first driving member 1122, the first moving member 1123, and the multiple first abutting members 1124 are arranged on the first fixing seat 1121. The multiple first abutting members 1124 are circumferentially and spaced apart along the first moving member 1123. The first driving member 1122 is connected to the first moving member 1123. The first driving member 1122 is configured to drive the first moving member 1123 to move, so as to drive the multiple first abutting members 1124 to move towards the inner wall surface 22 of the inner hole 21, so that the multiple first abutting members 1124 can abut against the inner wall surface 22 of the inner hole 21.

[0083] The first fixing seat 1121 serves as the installation base for the first driving member 1122, the first moving member 1123, and the multiple first abutting members 1124, and functions to support the first driving member 1122, the first moving member 1123, and the multiple first abutting members 1124.

[0084] The first driving member 1122 can be a component that can drive the multiple first moving members 1123 to move along the axial direction Z of the connecting rod 111. The first driving member 1122 can be a cylinder or other components.

[0085] The first moving member 1123 is a component that can move relative to the first fixing seat 1121 along the axial direction Z of the connecting rod 111.

[0086] The first abutting member 1124 can be a component used to abut against the inner wall surface 22 of the inner hole 21.

[0087] During use, the first driving member 1122 drives the first moving member 1123 to move along the axial direction Z of the connecting rod 111. The first moving member 1123 drives the multiple first abutting members 1124 located on the circumferential side to move towards the inner wall surface 22 of the inner hole 21, so that the multiple first abutting members 1124 can abut against the inner wall surface 22 of the inner hole 21, thereby realizing the fixation of the first fixing unit 112 in the inner hole 21.

[0088] By adopting the technical solution of this embodiment, the first driving member 1122 drives the first moving member 1123 to move, thereby synchronously driving a plurality of first abutting members 1124 to move synchronously. The plurality of first abutting members 1124 can extend from the circumference of the first fixed seat 1121 and abut against the inner wall of the inner hole 21, thereby realizing the fixation of the first fixing unit 112 in the inner hole 21. In addition, the number of the first abutting members 1124 is greater than or equal to three. After the first abutting members 1124 abut against the circular inner wall surface 22 of the inner hole 21, the center of the first fixing unit 112 can be automatically aligned with the axis M of the inner hole 21, which can simplify the measurement operation and improve the measurement accuracy.

[0089] In some embodiments, the outer peripheral surface of the first moving member 1123 is a first inclined surface 11231, and the first abutting member 1124 has a second inclined surface 11241 adapted to the first inclined surface 11231.

[0090] The first inclined surface 11231 may refer to that the outer peripheral surface of the first moving member 1123 is inclined relative to the center line of the first moving member 1123.

[0091] The end surface of the first abutting member 1124 facing the first moving member 1123 is the second inclined surface 11241. The first inclined surface 11231 and the second inclined surface 11241 can be fitted together, and the inclination angle of the first inclined surface 11231 is the same as or approximately the same as the inclination angle of the second inclined surface 11241.

[0092] Exemplarily, the first inclined surface 11231 may refer to a conical surface, and the first inclined surface 11231 is a conical arc surface.

[0093] Exemplarily, the first inclined surface 11231 includes a plurality of first inclined planes, which are distributed along the circumference of the first moving member 1123. The second inclined surface 11241 is a second inclined plane, and the plurality of first inclined planes respectively abut against the second inclined planes of the plurality of first abutting members 1124.

[0094] When the first driving member 1122 drives the first moving member 1123 to move along the axial direction Z of the connecting rod 111, the first inclined surface 11231 moves, thereby driving the first abutting member 1124 to move along the radial direction of the connecting rod 111, so that the first abutting member 1124 abuts against the inner wall surface 22 of the inner hole 21.

[0095] By adopting the technical solution of this embodiment, through the cooperation of the first inclined surface 11231 and the second inclined surface 11241, the first moving member 1123 and the first abutting member 1124 can convert the movement of the first moving member 1123 along the axial direction Z of the connecting rod 111 into the movement of the first abutting member 1124 along the radial direction of the connecting rod 111. Its structure is simple and the processing and manufacturing are simple.

[0096] In some embodiments, the first fixing unit 112 further includes a first elastic member 1125. The first elastic member 1125 is disposed between the first fixing seat 1121 and the first abutting member 1124, and the first elastic member 1125 is used to push the second inclined surface 11241 against the first inclined surface 11231.

[0097] The first elastic member 1125 may refer to a component having elasticity, and the first elastic member 1125 may be components such as a spring or a spring piece.

[0098] The first elastic member 1125 is disposed between the first fixing seat 1121 and the first abutting member 1124. The first elastic member 1125 can give an elastic force to the first abutting member 1124, so that the first inclined surface 11231 can always be in contact with the second inclined surface 11241.

[0099] Refer to Figure 4 As shown, when it is necessary to fix the first fixing unit 112 in the inner hole 21, the first driving member 1122 drives the first inclined surface 11231 of the first moving member 1123 to move upward, thereby driving the first abutting member 1124 to move toward the inner wall of the inner hole 21 until the first abutting member 1124 abuts against the inner wall surface 22 of the inner hole 21, and the first elastic member 1125 is compressed during this process. When it is necessary to disassemble the first fixing unit 112 from the inner hole 21, the first driving member 1122 drives the first inclined surface 11231 of the first moving member 1123 to move downward. Under the elastic action of the first elastic member 1125, the first inclined surface 11231 is always in contact with the second inclined surface 11241, so that the first abutting member 1124 can move toward the first moving member 1123, and the first abutting member 1124 is separated from the inner wall surface 22 of the inner hole 21.

[0100] In some embodiments, a first accommodation cavity 11211 is provided in the first fixing seat 1121. The first driving member 1122, the first moving member 1123, and the first abutting member 1124 are installed in the first accommodation cavity 11211. A first through hole 11212 is provided on the side wall of the first fixing seat 1121, and the first abutting member 1124 passes through the first through hole 11212, so as to facilitate the first abutting member 1124 to extend out of the first fixing seat 1121 to abut against the inner wall surface 22 of the inner hole 21.

[0101] In some embodiments, the first fixing unit 112 further includes a first mounting rod 1126. One end of the first mounting rod 1126 is connected to the side wall of the first receiving cavity 11211, and the other end of the first mounting rod 1126 slidably penetrates through the first abutting member 1124. The first elastic member 1125 is sleeved outside the first mounting rod 1126. The first elastic member 1125 is located between the first abutting member 1124 and the side wall of the first receiving cavity 11211. The first mounting rod 1126 can limit the first elastic member 1125, reducing the risk of the first elastic member 1125 popping out from between the first abutting member 1124 and the side wall of the first receiving cavity 11211. Additionally, the first mounting rod 1126 can also guide the movement of the first abutting member 1124.

[0102] Refer to Figure 5 As shown, in some embodiments, the second fixing unit 113 includes a second fixing base 1131, a second driving member 1132, a second moving member 1133, and at least three second abutting members 1134. The second driving member 1132, the second moving member 1133, and multiple second abutting members 1134 are arranged on the second fixing base 1131. The multiple second abutting members 1134 are circumferentially spaced apart along the second moving member 1133. The second driving member 1132 is connected to the second moving member 1133. The second driving member 1132 is used to drive the second moving member 1133 to move, thereby driving the multiple second abutting members 1134 to move towards the inner wall surface 22 of the inner hole 21, so that the multiple second abutting members 1134 can abut against the inner wall surface 22 of the inner hole 21.

[0103] The second fixing base 1131 serves as the mounting base for the second driving member 1132, the second moving member 1133, and the multiple second abutting members 1134, playing a role in supporting the second driving member 1132, the second moving member 1133, and the multiple second abutting members 1134.

[0104] The second driving member 1132 can refer to a component that can drive the multiple second moving members 1133 to move along the axial direction Z of the connecting rod 111. The second driving member 1132 can be a cylinder or other components.

[0105] The second moving member 1133 is a component that can move relative to the second fixing base 1131 along the axial direction Z of the connecting rod 111.

[0106] The second abutting member 1134 can refer to a component used to abut against the inner wall surface 22 of the inner hole 21.

[0107] In use, the second driving member 1132 drives the second moving member 1133 to move along the axial direction Z of the connecting rod 111. The second moving member 1133 drives a plurality of second abutting members 1134 located on the circumferential side to move towards the inner wall surface 22 of the inner hole 21, so that the plurality of second abutting members 1134 can abut against the inner wall surface 22 of the inner hole 21, thereby realizing the fixation of the second fixing unit 113 in the inner hole 21.

[0108] By adopting the technical solution of this embodiment, the second driving member 1132 drives the second moving member 1133 to move, so as to synchronously drive a plurality of second abutting members 1134 to move synchronously. The plurality of second abutting members 1134 can extend from the circumference of the second fixing seat 1131 and then abut against the inner wall of the inner hole 21, thereby realizing the fixation of the second fixing unit 113 in the inner hole 21. In addition, the number of the second abutting members 1134 is greater than or equal to three. After the second abutting members 1134 abut against the circular inner wall surface 22 of the inner hole 21, the center of the second fixing unit 113 can be automatically aligned with the axis M of the inner hole 21, which can simplify the measurement operation and improve the measurement accuracy.

[0109] In some embodiments, the outer peripheral surface of the second moving member 1133 is a third inclined surface 11331, and the second abutting member 1134 has a fourth inclined surface 11341 adapted to the third inclined surface 11331.

[0110] The third inclined surface 11331 may refer to that the outer peripheral surface of the second moving member 1133 is inclined relative to the center line of the second moving member 1133.

[0111] The end surface of the second abutting member 1134 facing the second moving member 1133 is the fourth inclined surface 11341. The third inclined surface 11331 and the fourth inclined surface 11341 can be fitted together, and the inclination angle of the third inclined surface 11331 is the same as or approximately the same as the inclination angle of the fourth inclined surface 11341.

[0112] Exemplarily, the third inclined surface 11331 may refer to a conical surface, and the third inclined surface 11331 is a conical arc surface.

[0113] Exemplarily, the third inclined surface 11331 includes a plurality of third inclined planes, which are distributed along the circumference of the second moving member 1133. The fourth inclined surface 11341 is a fourth inclined plane, and the plurality of third inclined planes respectively abut against the fourth inclined planes of the plurality of second abutting members 1134.

[0114] When the second driving member 1132 drives the second moving member 1133 to move along the axial direction Z of the connecting rod 111, the third inclined surface 11331 moves, thereby driving the second abutting member 1134 to move along the radial direction of the connecting rod 111, so that the second abutting member 1134 abuts against the inner wall surface 22 of the inner hole 21.

[0115] By adopting the technical solution of this embodiment, the second moving member 1133 and the second abutting member 1134 can convert the movement of the second moving member 1133 along the axial direction Z of the connecting rod 111 into the movement of the second abutting member 1134 along the radial direction of the connecting rod 111 through the cooperation of the third inclined surface 11331 and the fourth inclined surface 11341. The structure is simple and the processing and manufacturing are simple.

[0116] In some embodiments, the second fixing unit 113 further includes a second elastic member 1135. The second elastic member 1135 is disposed between the second fixing seat 1131 and the second abutting member 1134, and the second elastic member 1135 is used to push the fourth inclined surface 11341 against the third inclined surface 11331.

[0117] The second elastic member 1135 may refer to an elastic component, and the second elastic member 1135 may be components such as a spring or a spring piece.

[0118] The second elastic member 1135 is disposed between the second fixing seat 1131 and the second abutting member 1134. The second elastic member 1135 can give an elastic force to the second abutting member 1134, so that the third inclined surface 11331 can always abut against the fourth inclined surface 11341.

[0119] Refer to Figure 5 As shown, when it is necessary to fix the second fixing unit 113 in the inner hole 21, the second driving member 1132 drives the third inclined surface 11331 of the second moving member 1133 to move downward, thereby driving the second abutting member 1134 to move toward the inner wall of the inner hole 21 until the second abutting member 1134 abuts against the inner wall surface 22 of the inner hole 21, and compresses the second elastic member 1135 in this process. When it is necessary to disassemble the second fixing unit 113 from the inner hole 21, the second driving member 1132 drives the third inclined surface 11331 of the second moving member 1133 to move upward. Under the elastic action of the second elastic member 1135, the third inclined surface 11331 and the fourth inclined surface 11341 always abut against each other, so that the second abutting member 1134 can move toward the second moving member 1133, and the second abutting member 1134 is separated from the inner wall surface 22 of the inner hole 21.

[0120] In some embodiments, a second receiving cavity 11311 is provided in the second fixing seat 1131. The second driving member 1132, the second moving member 1133 and the second abutting member 1134 are installed in the second receiving cavity 11311. A second through hole 11312 is provided on the side wall of the second fixing seat 1131, and the second abutting member 1134 passes through the second through hole 11312, so as to facilitate the second abutting member 1134 to extend out of the second fixing seat 1131 to abut against the inner wall surface 22 of the inner hole 21.

[0121] In some embodiments, the second fixing unit 113 further includes a second mounting rod 1136. One end of the second mounting rod 1136 is connected to the side wall of the second accommodating cavity 11311. The other end of the second mounting rod 1136 slidably passes through the second abutting member 1134. The second elastic member 1135 is sleeved outside the second mounting rod 1136. The second elastic member 1135 is located between the second abutting member 1134 and the side wall of the second accommodating cavity 11311. The second mounting rod 1136 can limit the second elastic member 1135, reducing the risk of the second elastic member 1135 popping out from between the second abutting member 1134 and the side wall of the second accommodating cavity 11311. Additionally, the second mounting rod 1136 can also guide the movement of the second abutting member 1134.

[0122] In some embodiments, the first moving member 1123 is sleeved outside the first driving member 1122 and is screwed to the first driving member 1122; the second moving member 1133 is sleeved outside the second driving member 1132 and is screwed to the second driving member 1132.

[0123] The first moving member 1123 is provided with a threaded hole. The first driving member 1122 passes through the threaded hole of the first moving member 1123. The outer peripheral surface of the first driving member 1122 is provided with an external thread, and the external thread of the first driving member 1122 meshes with the internal thread in the threaded hole of the first moving member 1123.

[0124] The second moving member 1133 is provided with a threaded hole. The second driving member 1132 passes through the threaded hole of the second moving member 1133. The outer peripheral surface of the second driving member 1132 is provided with an external thread, and the external thread of the second driving member 1132 meshes with the internal thread in the threaded hole of the second moving member 1133.

[0125] By adopting the technical solution of this embodiment, the first moving member 1123 and the first driving member 1122, as well as the second moving member 1133 and the second driving member 1132, are connected by means of thread meshing. In this way, rotating the first driving member 1122 and the second driving member 1132 can achieve the movement of the first moving member 1123 and the second moving member 1133 along the axial direction Z of the connecting rod 111.

[0126] In some embodiments, referring to Figure 1 As shown, the fixing assembly 11 includes a third rotary driving member 114. The first driving member 1122 and the second driving member 1132 are respectively connected to both ends of the connecting rod 111. The first driving member 1122, the second driving member 1132 and the connecting rod 111 are coaxially arranged. The first driving member 1122, the second driving member 1132 and the connecting rod 111 form an integral structure and jointly form a central rod 115; the third rotary driving member 114 is connected to the central rod 115, and the third rotary driving member 114 is used to drive the central rod 115 to rotate around its own axis.

[0127] The first driving member 1122 and the second driving member 1132 are in a rod-shaped structure. The first driving member 1122, the second driving member 1132 and the connecting rod 111 are coaxially connected to form a central rod 115. The central rod 115 is a straight rod. The central rod 115 is divided into three sections along its axial direction. The two sections at both ends with external threads are the first driving member 1122 and the second driving member 1132 respectively, and the section in the middle is the connecting rod 111.

[0128] The third rotary driving member 114 drives the central rod 115 to rotate, thereby driving the movement of the first moving member 1123 and the first moving member 1123 sleeved at both ends of the central rod 115. The third rotary driving member 114 can be components such as a motor and a motor.

[0129] By adopting the technical solution of this embodiment, the central rod 115 can not only drive the first moving member 1123 and the second moving member 1133 to move, but also connect the first fixing unit 112 and the second fixing unit 113, which is beneficial to reducing the number of parts and improving the compactness of the device; during the process that the plurality of first abutting members 1124 and the plurality of second abutting members 1134 abut against the inner wall surface 22 of the inner hole 21, the centering of the inner hole 21 and the central rod 115 can be automatically realized, and the detection operation is also simpler; by using one third rotary driving member 114, the movement of the first moving member 1123 and the second moving member 1133 can be realized.

[0130] In some embodiments, both ends of the guide rod 131 are fixedly connected to the first fixing seat 1121 and the second fixing seat 1131 respectively. Both ends of the lead screw 1223 are connected to the first fixing seat 1121 and the second fixing seat 1131 through bearings. The first rotary driving member 1221 and the first transmission mechanism 1222 are installed on the first fixing seat 1121.

[0131] In some embodiments, both ends of the central rod 115 pass through the first fixing seat 1121 and the second fixing seat 1131 and are connected to the first fixing seat 1121 and the second fixing seat 1131 through bearings.

[0132] In some embodiments, the third rotary driving member 114 is installed on the first fixing seat 1121, and the third rotary driving member 114 is connected to the central rod 115 through a coupling.

[0133] In some embodiments, the spiral directions of the external threads at both ends of the central rod 115 are the same, and the spiral directions of the internal threads of the first moving member 1123 and the second moving member 1133 are opposite, so that when the central rod 115 rotates, the moving directions of the first moving member 1123 and the second moving member 1133 are opposite; of course, in other embodiments, when the central rod 115 rotates, the moving directions of the first moving member 1123 and the second moving member 1133 can also be the same, which can be determined according to the inclination directions of the first inclined surface 11231 and the third inclined surface 11331.

[0134] Of course, in other embodiments, the first driving member 1122, the second driving member 1132 and the connecting rod 111 can also be separate components, and the first driving member 1122, the second driving member 1132 and the connecting rod 111 are arranged staggeredly. The axis of the connecting rod 111 may not coincide with the axial direction of the inner hole 21.

[0135] The descriptions of the above embodiments tend to emphasize the differences between the embodiments. The same or similar parts can be referred to each other. For the sake of brevity, they will not be repeated herein.

[0136] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An inner diameter measuring device, characterized in that: include: A fixing assembly, comprising a connecting rod, a first fixing unit and a second fixing unit, wherein both ends of the connecting rod are connected to the first fixing unit and the second fixing unit respectively; the first fixing unit is used to be fixed to one end of the inner hole of the component to be tested; and the second fixing unit is used to be fixed to the other end of the inner hole of the component to be tested; A measuring assembly comprises a mounting seat, a first driving unit, a second driving unit, a first laser distance measuring device and a second laser distance measuring device, wherein the mounting seat is located between the first fixing unit and the second fixing unit; the first driving unit is connected to the fixing assembly, and the first driving unit is used to drive the mounting seat to move along the axial direction of the connecting rod; the first laser distance measuring device is connected to the mounting seat, and the first laser distance measuring device is used to measure the distance between the second fixing unit and the mounting seat; the second driving unit is connected to the mounting seat, and the second driving unit is connected to the second laser distance measuring device, and the second driving unit is used to drive the second laser distance measuring device to rotate around the axis of the inner hole; the second laser distance measuring device is used to measure the distance between the inner wall surface of the inner hole and the second laser distance measuring device.

2. The inner diameter measuring device according to claim 1, characterized in that: The first driving unit includes a first rotating driving member, a first transmission mechanism and a screw rod, the first rotating driving member is connected to the fixed component, the first rotating driving member is connected to the screw rod through the first transmission mechanism to drive the screw rod to rotate around its own axis; the screw rod and the connecting rod are arranged in parallel and spaced apart, the screw rod passes through the mounting seat, and the mounting seat is threadedly connected to the screw rod.

3. The inner diameter measuring device according to claim 1, characterized in that: The second driving unit includes a second rotating driving member, a second transmission mechanism and a rotating seat, the second rotating driving member is connected to the mounting seat, the rotating seat is rotatably connected to the mounting seat, the second laser ranging member is fixedly connected to the rotating seat, and the second rotating driving member is connected to the rotating seat through the second transmission mechanism to drive the rotating seat to rotate around the axis of the inner hole.

4. The inner diameter measuring device according to claim 1, characterized in that: The axis of the connecting rod is used to coincide with the axis of the inner hole.

5. The inner diameter measuring device according to any one of claims 1 to 4, characterized in that: The first fixed unit includes a first fixed seat, a first driving member, a first movable member and at least three first abutment members. The first driving member, the first movable member and the plurality of first abutment members are arranged on the first fixed seat. The plurality of first abutment members are distributed at intervals along the circumference of the first movable member. The first driving member is connected to the first movable member. The first driving member is used to drive the first movable member to move along the axis of the connecting rod, thereby driving the plurality of first abutment members to move toward the inner wall surface of the inner hole, so that the plurality of first abutment members can abut against the inner wall surface of the inner hole.

6. The inner diameter measuring device according to claim 5, characterized in that: The outer peripheral surface of the first moving member is a first inclined surface, and the first abutting member has a second inclined surface matched with the first inclined surface.

7. The inner diameter measuring device according to claim 6, characterized in that: The first fixing unit further includes a first elastic member, which is disposed between the first fixing seat and the first abutting member, and is used for pushing the second inclined surface to abut against the first inclined surface.

8. The inner diameter measuring device according to claim 5, characterized in that: The second fixed unit includes a second fixed seat, a second driving member, a second movable member and at least three second abutment members. The second driving member, the second movable member and multiple second abutment members are arranged on the second fixed seat. Multiple second abutment members are distributed at intervals along the circumference of the second movable member. The second driving member is connected to the second movable member. The second driving member is used to drive the second movable member to move, thereby driving the multiple second abutment members to move toward the inner wall surface of the inner hole, so that the multiple second abutment members can abut against the inner wall surface of the inner hole.

9. The inner diameter measuring device according to claim 8, characterized in that: The first moving member is sleeved outside the first driving member and is threadedly connected to the first driving member; the second moving member is sleeved outside the second driving member and is threadedly connected to the second driving member.

10. The inner diameter measuring device according to claim 9, characterized in that: The fixing assembly includes a third rotating driving member, the first driving member and the second driving member are respectively connected to two ends of the connecting rod, the first driving member, the second driving member and the connecting rod are coaxially arranged, and the first driving member, the second driving member and the connecting rod are an integrated structure and jointly form a central rod; The third rotation driving member is connected to the central rod, and the third rotation driving member is used to drive the central rod to rotate around its own axis.

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