Revolving body fixed with sensor

Abstract

The invention discloses a rotary body fixed with sensors, which comprises a rotary body main body, a fixing piece, N through hole groups and M sensors, and the curvature of the sensing surface of each sensor is the same as that of the outer side wall. The bolt part of the sensor is in threaded connection with the threaded hole of the fixing piece, the sensor is fixed to the fixing piece, then the clamping part of the sensor is clamped with the first through hole of the through hole set, the fixing piece is fixed into the rotary body main body, and at the moment, the first through hole and the fixing piece play a role in fixing the sensor; the sensor can be kept stable even under high-speed water flow scouring, and the situation that measurement of the sensor is interrupted or errors occur due to bolt looseness or adhesive failure is avoided. The curvature of the sensing surface of the sensor is the same as that of the outer side wall, so that the sensing surface of the sensor and the outer side wall can be positioned in the same curved surface when the sensor is fixed, and the change of the geometric shape of the surface of the rotary body caused by an external sensor is avoided, thereby reducing the flow field interference and improving the measurement accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of underwater launch technology for rotating bodies, and more specifically, to a rotating body fixed with sensors. Background Art

[0002] As the core method for studying the underwater launch technology and hydrodynamic characteristics of rotating bodies, the scaled model test plays a crucial role in promoting the design optimization and performance evaluation of underwater rotating bodies. In such tests, accurately obtaining the flow field parameters on the surface of the rotating body is the key to deeply understanding its hydrodynamic behavior and guiding the optimization design. Especially in the head and body regions of the rotating body, the measurement of flow field parameters in these areas is crucial for analyzing the dynamic loads borne by the rotating body underwater.

[0003] Of particular concern is that when the rotating body emerges from the water, that is, during the process of passing through the water-gas interface at high speed underwater, a series of complex hydrodynamic phenomena will occur, including the initial formation, development, and shedding and collapse of cavitation bubbles. These phenomena are accompanied by significant pressure fluctuations, cavitation effects, and fluid shear, etc., which have a profound impact on the stability, controllability, and safety of the rotating body. Therefore, accurately measuring the flow field parameters during this process is of great significance for revealing the hydrodynamic characteristics of the rotating body and optimizing its design.

[0004] However, traditional pressure measurement techniques face many challenges. Traditional external pressure sensors are usually fixed on the surface of the rotating body by means such as bolts and adhesives, and this approach has obvious drawbacks. First of all, the external sensor will change the geometric shape of the surface of the rotating body, forming steps or protrusions, which not only interfere with the hydrodynamic characteristics of the rotating body, but may also have an adverse effect on the cavitation phenomenon, resulting in a significant decrease in the accuracy of the test results. Secondly, when using the bolt fixing method, under the erosion of high-speed water flow, the bolts may become loose due to uneven stress, and even cause the sensor to fall off, which seriously affects the continuity and stability of the measurement. Thirdly, although the adhesive method can avoid the problem of bolt loosening to a certain extent, the adhesive may fail due to aging after long-term underwater immersion, which also threatens the reliability of the measurement. Finally, due to the transient characteristics of the pressure on the surface of the rotating body during the underwater launch process, the sensor is required to have extremely high response speed and sensitivity, while traditional external sensors often fall short in this regard.

[0005] In view of the above problems, it is necessary to improve the fixing method of the rotating body and the sensor. The fixing method needs to meet the following requirements: it can accurately measure the surface pressure distribution of the rotating body without affecting the curvature and cavitation characteristics of the rotating body surface; at the same time, it should have good stability and be easy to install and maintain. On the premise of not affecting the integrity of the flow shape of the moving body, accurately measure the surface pressure parameters of the rotating body. Effectively reduce or eliminate the flow field interference caused by the installation of the sensor, ensure the close fit between the sensor and the surface of the moving body, and achieve stable data transmission, so as to provide more reliable data support for the hydrodynamic research and performance optimization of the underwater rotating body.

[0006] Therefore, the present invention provides a rotating body fixed with a sensor. Summary of the Invention

[0007] In view of this, the present invention provides a rotating body fixed with a sensor, including:

[0008] A rotating body main body, including an outer side wall extending in a first direction, and the first direction is the extending direction of the rotating body main body; a receiving cavity is arranged in the rotating body main body, and the receiving cavity includes an inner side wall extending in the first direction;

[0009] A fixing member, arranged in the receiving cavity, and the fixing member is connected to the inner side wall;

[0010] N groups of through holes, each group of through holes includes a first through hole and a threaded hole corresponding to the first through hole, the first through hole is arranged on the rotating body main body, the threaded hole is arranged on the fixing member, N is an integer and N≥2;

[0011] A sensor, including a clamping portion and a bolt portion connected to each other, and one end of the clamping portion away from the bolt portion is an induction surface;

[0012] M groups of through holes are correspondingly provided with the sensor. In any group of through holes provided with the sensor, the clamping portion of the sensor is clamped with the first through hole, the bolt portion of the sensor is threadedly connected with the threaded hole, and the induction surface of the sensor has the same curvature as the outer side wall, M is a positive integer and M≤N.

[0013] Optionally, the fixing member is connected to the inner side wall through a boss;

[0014] Each group of through holes includes a second through hole, and the second through hole is arranged on the boss, and the second through hole communicates the first through hole and the threaded hole;

[0015] The clamping portion of the sensor includes a first stepped platform and a second stepped platform connected to each other, and the second stepped platform is connected to the bolt portion;

[0016] In any set of through-holes corresponding to the sensors, the first stepped platform is engaged with the first through-hole, the second stepped platform is engaged with the second through-hole, and the bolt portion is threadedly connected to the threaded hole.

[0017] Optionally, in one set of through-holes, the diameter of the first stepped platform is equal to the diameter of the first through-hole, the diameter of the second stepped platform is equal to the diameter of the second through-hole, and the diameter of the first through-hole is smaller than the diameter of the second through-hole.

[0018] Optionally, a first sealing ring is sleeved on the first stepped platform, and the first sealing ring contacts the second stepped platform;

[0019] A second sealing ring is sleeved on the bolt portion, and the second sealing ring contacts the second stepped platform.

[0020] Optionally, M < N. In any set of through-holes not corresponding to the sensors, embedding blocks are correspondingly arranged, and the shape of the embedding blocks is exactly the same as that of the sensors.

[0021] Optionally, the rotary body main body includes a center line, the number of the fixing members is at least two, all the fixing members are the same and the side of the fixing members away from the inner side wall is a symmetric pattern, and all the fixing members are arranged in an array around the center line.

[0022] Optionally, the fixing member is provided with a screw fixing hole, a screw is correspondingly arranged in the screw fixing hole, and the screw penetrates through the screw fixing hole and part of it is connected to the convex platform.

[0023] Optionally, the fixing member is provided with a circular groove, the circular groove corresponds to the screw fixing hole one by one, the circular groove is sleeved outside the screw fixing hole, and the inner diameter of the circular groove is the same as the diameter of the screw fixing hole.

[0024] Optionally, a third sealing ring is placed in the circular groove.

[0025] Optionally, the convex platform is integrated with the rotary body main body.

[0026] Compared with the prior art, a rotary body fixed with a sensor provided by the present invention at least achieves the following beneficial effects:

[0027] 1. In a rotating body with a sensor fixed thereto, in any through-hole group corresponding to the sensor, the engaging portion of the sensor engages with the first through-hole, and the bolt portion of the sensor is threadedly connected to the threaded hole. By threadedly connecting the bolt portion of the sensor to the threaded hole of the fixing member, the sensor is fixed to the fixing member. Then, after the engaging portion of the sensor engages with the first through-hole, the fixing member is connected to the inner side wall. At this time, both the first through-hole and the fixing member play a role in fixing the sensor, enabling the sensor to remain stable even under the scouring of high-speed water flow, and avoiding the situation where the measurement of the sensor is interrupted or errors occur due to bolt loosening or adhesive failure. This stability is particularly important for long-term and continuous pressure measurement.

[0028] 2. In a rotating body with a sensor fixed thereto provided by the present invention, the sensing surface of the sensor has the same curvature as the outer side wall. When fixing the sensor, the sensing surface of the sensor and the outer side wall can be located in the same curved surface, avoiding the change of the surface geometry of the rotating body by the external sensor, thereby reducing the flow field interference and improving the measurement accuracy.

[0029] 3. A rotating body with a sensor fixed thereto provided by the present invention further fixes the sensor by using a fixing member, which is convenient for installation and disassembly. It not only reduces the operation difficulty but also improves the work efficiency, and at the same time provides convenience for the regular calibration and update of the sensor.

[0030] Of course, any product implementing the present invention does not necessarily need to achieve all the above-mentioned technical effects simultaneously.

[0031] Through the following detailed description of the exemplary embodiments of the present invention with reference to the accompanying drawings, other features and advantages of the present invention will become clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings incorporated in the specification and constituting a part of the specification illustrate embodiments of the present invention and, together with the description, are used to explain the principles of the present invention.

[0033] Figure 1 is a schematic structural diagram of a rotating body with a sensor fixed thereto provided by the present invention.

[0034] Figure 2 is a schematic connection diagram of a fixing member, a sensor, an embedding block and a screw.

[0035] Figure 3 is Figure 1 a sectional view taken along the line A - A' in

[0036] Figure 4 is a schematic structural diagram of a fixing member.

[0037] Figure 5 isFigure 1 Cross-sectional view taken along line B-B'.

[0038] Figure 6 is Figure 5 Enlarged view of part D in the figure.

[0039] Figure 7 It is a schematic structural diagram of a sensor.

[0040] Figure 8 It is a schematic structural diagram of an embedding block.

[0041] In the figure: 1, the main body of the rotating body; 2, the outer side wall; 3, the accommodating cavity; 4, the inner side wall; 5, the fixing member; 6, the through-hole group; 7, the first through-hole; 8, the threaded hole; 9, the sensor; 10, the engaging portion; 11, the bolt portion; 12, the sensing surface; 13, the boss; 14, the second through-hole; 15, the first stepped platform; 16, the second stepped platform; 17, the first sealing ring; 18, the second sealing ring; 19, the embedding block; 20, the screw fixing hole; 21, the screw; 22, the circular groove; Z, the first direction. Detailed implementation manners

[0042] Now, various exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention.

[0043] The following description of at least one exemplary embodiment is merely illustrative in nature and in no way serves as a limitation on the present invention or its application or use.

[0044] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the specification.

[0045] In all the examples shown and discussed herein, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0046] It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0047] Combined with Figures 1 to 8 , Figure 1 is a schematic structural diagram of a rotating body fixed with a sensor provided by the present invention, Figure 2 is a schematic connection diagram of a fixing member, a sensor, an embedding block, and a screw, Figure 3 is Figure 1The sectional view taken along the A-A' direction in [Chinese context], Figure 4 is a schematic structural view of a fixing member, Figure 5 is Figure 1 The sectional view taken along the B-B' direction in [Chinese context], Figure 6 is Figure 5 The enlarged view at position D in [Chinese context], Figure 7 is a schematic structural view of a sensor, Figure 8 is a schematic structural view of an embedding block, to illustrate a specific embodiment of a rotating body fixed with a sensor provided by the present invention, including:

[0048] A rotating body main body 1, including an outer side wall 2 extending along a first direction Z, and the first direction Z is the extending direction of the rotating body main body 1; a receiving cavity 3 is provided inside the rotating body main body 1, and the receiving cavity 3 includes an inner side wall 4 extending along the first direction Z;

[0049] A fixing member 5, disposed in the receiving cavity 3, and the fixing member 5 is connected to the inner side wall 4;

[0050] N through-hole groups 6, the through-hole group 6 includes a first through-hole 7 and a threaded hole 8 corresponding to the first through-hole 7, the first through-hole 7 is provided on the rotating body main body 1, the threaded hole 8 is provided on the fixing member 5, N is an integer and N≥2;

[0051] A sensor 9, including an engaging portion 10 and a bolt portion 11 connected to each other, and one end of the engaging portion 10 away from the bolt portion 11 is an induction surface 12;

[0052] M through-hole groups 6 are correspondingly provided with sensors 9. In any through-hole group 6 provided with a sensor 9 correspondingly, the engaging portion 10 of the sensor 9 is engaged with the first through-hole 7, the bolt portion 11 of the sensor 9 is threadedly connected to the threaded hole 8, and the induction surface 12 of the sensor 9 has the same curvature as the outer side wall 2, and M is a positive integer and M≤N.

[0053] It is understandable that in this embodiment, the structure of the sensor 9 is not improved, and a sensor 9 with a relatively high precision in the prior art can be adopted. A piezoelectric module is provided inside the sensor 9 for measuring the surface pressure of the rotating body. Advanced sensor 9 technology can capture the transient characteristics of the surface pressure of the underwater rotating body more accurately and obtain more precise measurement data. By providing accurate and stable pressure measurement data, it can provide more reliable data support for the hydrodynamic research and performance optimization of the underwater rotating body, which not only helps to accelerate the research process and improve the research efficiency, but also provides a more accurate basis for the design optimization of the underwater rotating body. The rotating body main body 1 can be assembled from at least two parts, which is convenient for placing the fixing member 5 and the like into the accommodating cavity 3. Of course, it is not limited thereto. In any through-hole group 6 corresponding to the sensor 9, the engaging portion 10 of the sensor 9 is engaged with the first through-hole 7, and the bolt portion 11 of the sensor 9 is threadedly connected to the threaded hole 8. By threadedly connecting the bolt portion 11 of the sensor 9 to the threaded hole 8 of the fixing member 5, the sensor 9 is fixed to the fixing member 5. After the engaging portion 10 of the sensor 9 is engaged with the first through-hole 7, the fixing member 5 is connected to the inner side wall 4. At this time, both the first through-hole 7 and the fixing member 5 play a role in fixing the sensor 9, so that the sensor 9 can be kept stable even under the scouring of high-speed water flow, avoiding the situation that the measurement of the sensor 9 is interrupted or an error occurs due to the loosening of the bolt or the failure of the adhesive. This stability is particularly important for long-term and continuous pressure measurement. Further fixing the sensor 9 with the fixing member 5 is convenient for installation and disassembly, which not only reduces the operation difficulty, but also improves the work efficiency, and at the same time provides convenience for the regular calibration and update of the sensor 9. The sensing surface 12 of the sensor 9 has the same curvature as the outer side wall 2, so that when the sensor 9 is fixed, the sensing surface 12 of the sensor 9 and the outer side wall 2 are located in the same curved surface, that is, the sensing surface 12 of the sensor 9 is seamlessly attached to the outer side wall 2 without forming steps or protrusions, avoiding the geometric shape change of the rotating body surface caused by the external sensor 9, thereby reducing the flow field interference and improving the measurement accuracy. The installation method of the sensor 9 provided in this embodiment on the rotating body can be applied to rotating bodies of different shapes and sizes to meet different test requirements. This versatility makes the installation method of the sensor 9 provided in this embodiment have a wider application prospect in the hydrodynamic research and performance optimization of the underwater rotating body.

[0054] In some alternative embodiments, with continued reference to Figures 1 to 8 , the fixing member 5 and the inner side wall 4 are connected by a boss 13;

[0055] The through-hole group 6 includes a second through-hole 14, and the second through-hole 14 is provided on the boss 13, and the second through-hole 14 communicates with the first through-hole 7 and the threaded hole 8;

[0056] The engaging portion 10 of the sensor 9 includes a first stepped platform 15 and a second stepped platform 16 that are connected. The second stepped platform 16 is connected to the bolt portion 11;

[0057] In any through-hole group 6 where the sensor 9 is correspondingly arranged, the first stepped platform 15 engages with the first through-hole 7, the second stepped platform 16 engages with the second through-hole 14, and the bolt portion 11 is threadedly connected to the threaded hole 8.

[0058] It can be understood that Figure 1 、 Figure 2 and Figure 5 The shape of the rotating body main body 1 in is only for illustration. Of course, it is not limited to this. The rotating body main body 1 can also be bullet-shaped. This embodiment does not make specific restrictions on this. The accommodating cavity 3 provided inside the rotating body main body 1 is usually cylindrical, so that the rotating body is more uniform. That is, the inner side wall 4 of the accommodating cavity 3 may be a curved surface. Therefore, one side of the convex platform 13 is attached to and connected to the inner side wall 4 of the curved surface, and the other side is attached to and connected to the fixing portion by a plane, so as to realize the relative position fixation of the fixing member 5 and the inner side wall 4, and further ensure the position stability of the sensor 9 and the embedded block 19.

[0059] In some alternative embodiments, continue to refer to Figures 1 to 8 , in a through-hole group 6, the diameter of the first stepped platform 15 is equal to the diameter of the first through-hole 7, the diameter of the second stepped platform 16 is equal to the diameter of the second through-hole 14, and the diameter of the first through-hole 7 is smaller than the diameter of the second through-hole 14.

[0060] It can be understood that the diameter of the first through-hole 7 being smaller than the diameter of the second through-hole 14 can further limit the position of the sensor 9. As long as the length of the first stepped platform 15 is equal to the depth of the first through-hole 7, when installing, the second stepped platform 16 cannot enter the first through-hole 7, so as to avoid the formation of steps or protrusions on the sensing surface 12 of the sensor 9 after installation and the outer side wall 2, which helps to reduce the water flow impact on the sensor 9 and can also make the surface pressure of the outer side wall 2 measured by the sensor 9 more accurate.

[0061] In some alternative embodiments, continue to refer to Figures 1 to 8 , a first sealing ring 17 is sleeved outside the first stepped platform 15, and the first sealing ring 17 contacts the second stepped platform 16;

[0062] A second sealing ring 18 is sleeved outside the bolt portion 11, and the second sealing ring 18 contacts the second stepped platform 16.

[0063] It can be understood that setting the first sealing ring 17 helps to avoid or reduce water from entering the accommodation cavity 3 along the gap between the first through hole 7 and the first stepped platform 15; setting the second sealing ring 18 helps to avoid or reduce water from entering the accommodation cavity 3 along the gap between the second through hole 14 and the second stepped platform 16, improving the sealing performance inside the rotating body main body 1 and preventing water vapor from entering the rotating body and affecting the measurement accuracy. Of course, necessary sealing performance tests can be carried out after installation to ensure that water vapor will not seep in and affect the measurement accuracy. Further, after confirming that all components are installed correctly and fit tightly, the installation process of the sensor 9 is completed, and necessary debugging and calibration work can also be carried out to ensure that the sensor 9 can accurately measure the pressure distribution on the surface of the underwater rotating body.

[0064] In some alternative embodiments, with continued reference to Figures 1 to 8 , where M < N, in any through-hole group 6 not correspondingly provided with the sensor 9, an embedding block 19 is correspondingly provided, and the shape of the embedding block 19 is exactly the same as that of the sensor 9.

[0065] It can be understood that when M < N, the sensor 9 is not correspondingly provided in N - M through-hole groups 6. If the rotating body main body 1 is placed underwater, water will enter the accommodation cavity 3 along the N - M through-hole groups 6 and affect the measurement accuracy. Therefore, it is necessary to set the embedding block 19 in the through-hole group 6 not correspondingly provided with the sensor 9 to play a role in sealing and balancing the through-hole group 6 not correspondingly provided with the sensor 9. The through-hole group 6 is adapted to the shape of the sensor 9, and the embedding block 19 is set to have exactly the same shape as the sensor 9, so that the embedding block 19 is adapted to the shape of the through-hole group 6, and the sealing and balancing effects are better.

[0066] In some alternative embodiments, with continued reference to Figures 1 to 8 , the rotating body main body 1 includes a center line, the number of fixing members 5 is at least two, all the fixing members 5 are the same, and the side of the fixing member 5 away from the inner side wall 4 is a symmetric pattern, and all the fixing members 5 are arranged in an array around the center line.

[0067] It can be understood that since all the fixing members 5 are arranged in an array around the center line, the corresponding first through holes 7 are relatively evenly distributed in the rotating body main body 1, or the corresponding first through holes 7 and the bosses 13 are also relatively evenly distributed in the rotating body main body 1, so that the assembled sensors 9 are relatively evenly distributed, or the assembled sensors 9 and the embedding blocks 19 are relatively evenly distributed, thereby improving the uniformity of the rotating body.

[0068] In some alternative embodiments, with continued reference to Figures 1 to 8 , the fixing member 5 is provided with a screw fixing hole 20, and a screw 21 is correspondingly provided for the screw fixing hole 20. The screw 21 passes through the screw fixing hole 20 and part of it is connected to the boss 13.

[0069] It can be understood that the provision of the boss 13 serves not only as a medium for connecting the inner side wall 4 of the curved surface and the planar fixing member 5, but also provides a position for facilitating the fixing of the fixing member 5. That is, the screw 21 passes through the screw fixing hole 20 and partially penetrates into the boss 13 to fix the position of the fixing member 5. Even the screw 21 can penetrate through the boss 13 and partially penetrate into the rotary body main body 1, but the end of the screw 21 close to the outer side wall 2 is located between the outer side wall 2 and the inner side wall 4.

[0070] In some alternative embodiments, with continued reference to Figures 1 to 8 , the fixing member 5 is provided with a circular groove 22, the circular groove 22 corresponds to the screw fixing hole 20 one by one, the circular groove 22 is sleeved outside the screw fixing hole 20, and the inner diameter of the circular groove 22 is the same as the diameter of the screw fixing hole 20.

[0071] It can be understood that the circular groove 22 can accommodate the end of the screw 21, so as to ensure that the distance from the end of the screw 21 to the center line of the rotary body is the same or approximately the same, which helps to improve the uniformity of the rotary body.

[0072] In some alternative embodiments, with continued reference to Figures 1 to 8 , a third sealing ring is placed in the circular groove 22.

[0073] It can be understood that the provision of the third sealing ring not only serves as a sealing function, but also plays a buffering role when the screw 21 is used to connect the fixing member 5.

[0074] In some alternative embodiments, with continued reference to Figures 1 to 8 , the boss 13 and the rotary body main body 1 are integrated.

[0075] It can be understood that the integration of the boss 13 and the rotary body main body 1 can reduce the connection steps, and the relative positions of the boss 13 and the rotary body main body 1 are more accurate, avoiding water vapor from entering the rotary body along the gap between the inner side wall 4 and the boss 13, thereby further improving the sealing performance and preventing water vapor from entering the rotary body and affecting the measurement accuracy.

[0076] From the above embodiments, it can be seen that a rotary body fixed with a sensor provided by the present invention achieves at least the following beneficial effects:

[0077] 1. In a rotating body with a sensor fixed thereto according to the present invention, in any through-hole group corresponding to the sensor, the engaging portion of the sensor engages with the first through-hole, and the bolt portion of the sensor is threadedly connected to the threaded hole. By threadedly connecting the bolt portion of the sensor to the threaded hole of the fixing member, the sensor is fixed to the fixing member. Then, after the engaging portion of the sensor engages with the first through-hole, the fixing member is connected to the inner side wall. At this time, both the first through-hole and the fixing member play a role in fixing the sensor, enabling the sensor to remain stable even under the scouring of high-speed water flow, and avoiding the situation where the measurement of the sensor is interrupted or an error occurs due to the loosening of the bolt or the failure of the adhesive. This stability is particularly important for long-term and continuous pressure measurement.

[0078] 2. In a rotating body with a sensor fixed thereto according to the present invention, the sensing surface of the sensor has the same curvature as the outer side wall. When fixing the sensor, the sensing surface of the sensor and the outer side wall can be located in the same curved surface, avoiding the change of the surface geometry of the rotating body by the external sensor, thereby reducing the flow field interference and improving the measurement accuracy.

[0079] 3. A rotating body with a sensor fixed thereto according to the present invention further fixes the sensor by using a fixing member, which is convenient for installation and disassembly. It not only reduces the operation difficulty but also improves the work efficiency, and at the same time provides convenience for the regular calibration and update of the sensor.

[0080] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A rotating body with a sensor fixed thereon, characterized in that: include: The rotating body body comprises an outer side wall extending along a first direction, wherein the first direction is an extending direction of the rotating body body; the rotating body body is provided with a receiving cavity, wherein the receiving cavity comprises an inner side wall extending along the first direction; A fixing member, disposed in the accommodating cavity, the fixing member being connected to the inner side wall; N through hole groups, the through hole groups comprising a first through hole and a threaded hole corresponding to the first through hole, the first through hole being arranged in the rotating body, the threaded hole being arranged in the fixing member, N being an integer and N≥2; The sensor comprises a clamping portion and a bolt portion connected to each other, wherein one end of the clamping portion away from the bolt portion is a sensing surface; The sensors are correspondingly arranged in M ​​through hole groups. In any through hole group correspondingly arranged with the sensor, the engaging portion of the sensor is engaged with the first through hole, the bolt portion of the sensor is threadedly connected with the threaded hole, the sensing surface of the sensor has the same curvature as the outer side wall, M is a positive integer and M≤N.

2. A rotating body with a sensor fixed thereon according to claim 1, characterized in that: The fixing member is connected to the inner side wall via a boss; The through hole group includes a second through hole, the second through hole is arranged on the boss, and the second through hole communicates with the first through hole and the threaded hole; The engaging portion of the sensor includes a first step and a second step connected to each other, wherein the second step is connected to the bolt portion; In any one of the through hole groups corresponding to the sensor, the first step is engaged with the first through hole, the second step is engaged with the second through hole, and the bolt portion is threadedly connected with the threaded hole.

3. A rotating body with a sensor fixed thereon according to claim 2, characterized in that: In one of the through-hole groups, the diameter of the first terrace is equal to the diameter of the first through-hole, the diameter of the second terrace is equal to the diameter of the second through-hole, and the diameter of the first through-hole is smaller than the diameter of the second through-hole.

4. A rotating body with a sensor fixed thereon according to claim 2 or 3, characterized in that: The first step is covered with a first sealing ring, and the first sealing ring is in contact with the second step; A second sealing ring is disposed outside the bolt portion, and the second sealing ring is in contact with the second step.

5. A rotating body with a sensor fixed thereon according to claim 1, 2 or 3, characterized in that: M<N, in any through hole group not correspondingly provided with the sensor, an embedded block is correspondingly provided, and the shape of the embedded block is completely the same as that of the sensor.

6. The rotary body with a sensor fixed thereon according to claim 1, characterized in that: The rotating body includes a center line, the number of the fixing parts is at least two, all the fixing parts are identical and the side of the fixing parts away from the inner wall is a symmetrical pattern, and all the fixing parts are arranged in an array around the center line.

7. The rotary body with a sensor fixed thereon according to claim 2, characterized in that: The fixing piece is provided with a screw fixing hole, and a screw is correspondingly provided in the screw fixing hole. The screw passes through the screw fixing hole and is partially connected with the boss.

8. The rotary body with a sensor fixed thereon according to claim 7, characterized in that: The fixing piece is provided with a circular groove, the circular groove corresponds to the screw fixing hole one by one, the circular groove is sleeved outside the screw fixing hole, and the inner diameter of the circular groove is the same as the diameter of the screw fixing hole.

9. The rotary body with a sensor fixed thereon according to claim 8, characterized in that: A third sealing ring is placed in the circular groove.

10. A rotating body with a sensor fixed thereon according to claim 7, characterized in that: The boss is integrated with the rotating body.

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