Device and method for measuring rotational inertia of high-speed rotating shaft body

Abstract

The invention relates to the technical field of measuring devices, in particular to a high-speed rotating shaft body rotational inertia measuring device and method. Comprising a speed measuring instrument used for measuring the rotation speed of the rotating shaft body, a driving part used for providing power for the rotation motion of the rotating shaft body, and a transmission part used for transmitting the power output by the driving part to the rotating shaft body. By adopting a mode of hydraulically driving the rotating shaft body to rotate, the purpose of providing rapid and constant driving force for the rotating shaft body can be achieved, so that the rotational inertia of the rotating shaft body can be conveniently calculated according to the constant driving force, large errors of a calculation result caused by unstable driving force are avoided, and the measurement precision is improved; meanwhile, by measuring the rotational inertia of the rotating shaft body in the acceleration and deceleration processes, the calibration of the measured value can be realized, the detection period of the rotating shaft body is conveniently shortened, the efficiency is improved, and the structure is simple in mode, convenient to operate and low in cost.

Description

Technical Field

[0001] The present invention relates to the technical field of measuring devices, and particularly to a device and method for measuring the moment of inertia of a high-speed rotating shaft body. Background Art

[0002] The moment of inertia is a physical quantity that describes the inertia of an object during rotation. It determines the magnitude of the angular acceleration of an object when subjected to an external torque. Since high-speed rotating shaft bodies are increasingly widely used in fields such as aerospace, new energy (such as wind turbines, flywheel energy storage systems), precision machine tools, and electric vehicle drive systems, the moment of inertia of the rotating shaft body, as a core dynamic parameter, directly affects its acceleration performance, vibration characteristics, and energy efficiency. Especially under high-speed operating conditions, a small deviation in the moment of inertia may lead to system resonance, fatigue damage, or even catastrophic failure. Therefore, high-precision measurement of the moment of inertia of high-speed rotating shaft bodies has become an essential part of industrial design and quality control.

[0003] Currently, the measurement of the moment of inertia mainly relies on traditional methods such as the torsion pendulum method, the free fall method, and the three-wire pendulum method. However, these techniques generally have obvious limitations: Low-speed limitation: Traditional devices are mostly based on static or quasi-static assumptions. The measurement process relies on low-frequency vibration or gravity drive and cannot adapt to the dynamic characteristics of high-speed rotation. Passivity of measurement: Traditional devices need to rely on forces such as gravity or elastic force to drive the object to move back and forth, and record the reciprocating period and time. The measurement time is long, and active drive-type rapid measurement cannot be achieved. Limitations of reciprocating motion: Traditional measurement methods mainly utilize reciprocating motion, while the measurement of a rotating shaft body requires continuous and unidirectional rotation. Unstable acting force: A constant unidirectional driving force cannot be provided for the rotating shaft body, resulting in errors easily occurring in the calculation of the moment of inertia. Summary of the Invention

[0004] In the present invention, a device and method for measuring the moment of inertia of a high-speed rotating shaft body are provided, which can effectively solve the problems in the background art.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: A device for measuring the moment of inertia of a high-speed rotating shaft body includes a tachometer for measuring the rotation speed of the rotating shaft body, a driving part for providing power for the rotation of the rotating shaft body, and a transmission part for transmitting the power output by the driving part to the rotating shaft body. The driving part includes an outer cylinder and a fixing frame passing through the outer cylinder. A moving disk is slidably arranged on the fixing frame. The moving disk is located inside the outer cylinder and is screwed to the outer cylinder. One end of the fixing frame is provided with a first oil cylinder for providing power for the movement of the moving disk. When the moving disk moves, the outer cylinder rotates self - rotatably, and the outer cylinder transmits power to the rotating shaft body through the transmission part; Wherein, the other end of the fixing frame is provided with a second oil cylinder. When one of the first oil cylinder and the second oil cylinder pushes the moving disk to a specified position and separates from each other, the moving disk squeezes the other one of the first oil cylinder and the second oil cylinder due to inertia.

[0006] In some embodiments of the present invention, a first spiral groove is formed on the inner wall of the outer cylinder. A plurality of bases are arranged on the outer wall of the moving disk. A plurality of rolling bodies are rotatably arranged on the bases, and the rolling bodies are used in cooperation with the first spiral groove.

[0007] In some embodiments of the present invention, quick - installation structures are respectively arranged between the moving disk and the output end of the first oil cylinder, and between the moving disk and the output end of the second oil cylinder.

[0008] In some embodiments of the present invention, the quick - installation structure includes a slot - card plate arranged on the output end of the first oil cylinder or the second oil cylinder, a block arranged on the end face of the moving disk and used in cooperation with the slot - card plate, and a plurality of slots formed on the side wall of the block. A plurality of inserting bodies are slidably inserted through the slot - card plate, and the inserting bodies are used in cooperation with the slots.

[0009] In some embodiments of the present invention, a plurality of slotted grooves are formed on the fixing frame. Two guiding grooves are oppositely formed on the inner side wall of the slotted groove, and the two guiding grooves respectively correspond to the first oil cylinder and the second oil cylinder; The guiding groove includes a wire groove and an inclined groove, and the two inclined grooves are located between the two wire grooves; A sliding column is slidably arranged in the guiding groove, and the sliding column is connected to the inserting body.

[0010] In some embodiments of the present invention, the transmission part includes a turntable and a transmission shaft. A clamping structure for clamping the rotating shaft body is arranged on the turntable. Transmission wheels are arranged at both ends of the transmission shaft, and the two transmission wheels are respectively in transmission connection with the outer cylinder and the turntable.

[0011] In some embodiments of the present invention, the clamping structure includes a plurality of pressing units circumferentially distributed on the turntable, and each pressing unit moves synchronously along the radial direction of the turntable; The pressing unit includes a moving body slidably disposed on the end face of the turntable and a column disposed on the moving body. A long plate is provided at the end of the column facing the rotating shaft body, and the long plate is used in cooperation with the keyway on the rotating shaft body.

[0012] In some embodiments of the present invention, the column passes through the moving body and moves relative to it. A second spiral groove is formed on the outer wall of the column, and a rib is provided on the moving body and is used in cooperation with the second spiral groove. The column and the moving body are connected by an elastic body.

[0013] In some embodiments of the present invention, two top blocks are rotatably disposed on the long plate. A plane is provided on the top block, and the plane is used to fit against the inner wall of the keyway. The top block and the long plate are connected by a spring piece.

[0014] A method for measuring the moment of inertia of a high-speed rotating shaft body, using the above-mentioned measuring device for the moment of inertia of a high-speed rotating shaft body, includes the following steps: Fix the position of the rotating shaft body and allow the rotating shaft body to freely rotate about its own axis; Use the transmission part to drive the driving part to be in transmission connection with the rotating shaft body; In the initial state, the moving disk is located on one side inside the outer cylinder. The first oil cylinder is in a contracted state, and the first oil cylinder is connected to the moving disk. The second oil cylinder is in an extended state; Provide equal and constant hydraulic pressures for the first oil cylinder and the second oil cylinder. The first oil cylinder provides a constant thrust for the moving disk, and the moving disk moves laterally; The threaded connection state between the moving disk and the outer cylinder causes the outer cylinder to rotate. The outer cylinder drives the rotating shaft body to rotate through the transmission part; When the moving disk moves to the midpoint position between the first oil cylinder and the second oil cylinder, record the moving distance data of the moving disk and the rotational speed data of the rotating shaft body. Calculate the moment of inertia of the rotating shaft body using the recorded data, the pitch of the moving disk, and the hydraulic pressure value of the first oil cylinder; At the midpoint position, the moving disk is separated from the first oil cylinder, and due to the rotational inertia of the rotating shaft body, the moving disk will continue to move and press the second oil cylinder, causing the second oil cylinder to contract; Record the moving distance of the moving disk when the rotating shaft body stops rotating. Recalculate the moment of inertia of the rotating shaft body based on the maximum rotational speed of the rotating shaft body, the moving distance of the moving disk, the pitch of the moving disk, and the hydraulic pressure value of the second oil cylinder to calibrate the moment of inertia value.

[0015] The technical solution of the present invention has the following effects: By adopting the method of driving the rotating shaft body to rotate hydraulically, the purpose of providing a fast and constant driving force for the rotating shaft body can be achieved, thereby facilitating the calculation of the moment of inertia of the rotating shaft body based on the constant driving force, avoiding large errors in the calculation results caused by unstable driving force, improving the measurement accuracy. At the same time, by measuring the moment of inertia during the acceleration and deceleration processes of the rotating shaft body, the verification of the measured value can be realized, and it is convenient to shorten the detection cycle of the rotating shaft body and improve the efficiency. This structural method is simple, easy to operate, and has low cost. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0017] Figure 1 is the structural schematic diagram of the present invention; Figure 2 is the exploded structural schematic diagram of the driving part in the embodiment of the present invention; Figure 3 is the schematic diagram of the moving disk and its upper structure in the embodiment of the present invention; Figure 4 is the structural schematic diagram of the moving disk in the embodiment of the present invention; Figure 5 is the partial sectional structural schematic diagram of the fixing bracket in the embodiment of the present invention; Figure 6 is the structural schematic diagram of the turntable and the rotating shaft body in the embodiment of the present invention; Figure 7 is the structural schematic diagram of the rotating shaft body and its clamping structure in the embodiment of the present invention; Figure 8 is the structural schematic diagram of the pressing unit in the embodiment of the present invention; Figure 9 is the structural schematic diagram of the top block in the embodiment of the present invention; Figure 10 is Figure 6 the structural schematic diagram of the middle turntable from another perspective.

[0018] Reference Signs: 100, rotating shaft body; 101, tachometer; 102, pressure roller; 200. Driving part; 201. Outer cylinder; 202. Fixed frame; 203. Moving disk; 204. First oil cylinder; 205. Second oil cylinder; 206. First spiral groove; 207. Base; 208. Rolling body; 209. Card slot plate; 210. Card block; 211. Insert body; 212. Insert slot; 213. Notch; 214. Wire groove; 215. Inclined groove; 216. Slide post 300. Transmission part; 301. Turntable; 302. Transmission shaft; 303. Transmission wheel; 304. Pressing unit; 305. Moving body; 306. Cylinder; 307. Long plate; 308. Keyway; 309. Second spiral groove; 310. Elastic body; 311. Top block; 312. Elastic sheet; 313. Groove; 314. Adjusting disk; 315. Connecting rod 400. Base Specific implementation mode

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this invention belongs. The terms used in the specification of this invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0021] As Figures 1 to 2 shown, the high-speed rotating shaft inertia measuring device of the present invention includes a tachometer 101 for measuring the self-rotation speed of the rotating shaft body 100, a driving part 200 for providing power for the self-rotation movement of the rotating shaft body 100, and a transmission part 300 for transmitting the power output by the driving part 200 to the rotating shaft body 100; The driving part 200 includes an outer cylinder 201 and a fixed frame 202 passing through the outer cylinder 201. A moving disk 203 is slidably arranged on the fixed frame 202. The moving disk 203 is located inside the outer cylinder 201, and the moving disk 203 is screwed to the outer cylinder 201. One end of the fixed frame 202 is provided with a first oil cylinder 204 for providing power for the movement of the moving disk 203. When the moving disk 203 moves, the outer cylinder 201 rotates, and the outer cylinder 201 transmits the power to the rotating shaft body 100 through the transmission part 300; Wherein, the other end of the fixed frame 202 is provided with a second oil cylinder 205. When one of the first oil cylinder 204 and the second oil cylinder 205 pushes the moving disk 203 to move to a specified position and separates from each other, the moving disk 203 presses the other one of the first oil cylinder 204 and the second oil cylinder 205 due to inertia; In the present invention, the rotary shaft body 100, the driving part 200, and the transmission part 300 can all be installed on the base 400. Specifically, the outer cylinder 201 is rotatably arranged on the base 400, and the fixing frame 202 is fixedly relative to the base 400. To fix the rotary shaft body 100, a method of arranging a plurality of pressure rollers 102 in the circumferential direction of the rotary shaft body 100 can be adopted; the tachometer 101 is installed on one pressure roller 102 and is used to measure the rotational speed of this pressure roller 102, thereby measuring the rotational speed of the rotary shaft body 100. According to the diameter of the rotary shaft body 100, the angular velocity of the rotary shaft body 100 can be calculated. Of course, an angular velocity measuring instrument can also be directly used to measure the rotational angular velocity of the rotary shaft body 100; the driving part 200 can transmit power to the rotary shaft body 100 through the transmission part 300, thereby driving the rotary shaft body 100 to rotate. By using this method, the direct connection between the driving part 200 and the rotary shaft body 100 can be avoided, which is convenient for structural assembly and position adjustment. When detecting rotary shaft bodies 100 with different diameters, only the positions of the corresponding pressure rollers 102 need to be adjusted, and there is no need to adjust the driving part 200 and the transmission part 300, which is convenient for operation; since the driving part 200 and the transmission part 300 have their own moments of inertia during operation, before detecting the rotary shaft body 100, it is necessary to measure the moments of inertia of the driving part 200 and the transmission part 300 during no-load operation to improve the detection accuracy; To achieve the effect of providing a fast and constant driving force for the rotary shaft body 100, hydraulic drive can be adopted. In the traditional motor drive method, since its output torque cannot be constant, it cannot be used. And in a traditional hydraulic motor, during the process of a piston reciprocating for one cycle, its output torque also changes at all times, so it also cannot provide a constant force. For other conventional drive methods, they also cannot meet the requirements of the present invention. To achieve the above purpose, the present invention adopts a combination of hydraulic and mechanical methods. Specifically, the first oil cylinder 204 and the second oil cylinder 205 can push the moving disk 203 to move. By using the screw connection relationship between the moving disk 203 and the outer cylinder 201, the outer cylinder 201 can be driven to rotate, and then the outer cylinder 201 transmits the power to the rotary shaft body 100 to achieve the effect of providing a fast and constant driving force for the rotary shaft body 100; On the basis of the above method, when only the first oil cylinder 204 or the second oil cylinder 205 is used, the rotating shaft body 100 can only realize the process from rest to rotating to the highest speed. However, during the process of the rotating shaft body 100 decelerating from the highest speed to rest, it cannot be effectively utilized, and the deceleration process of the rotating shaft body 100 also requires auxiliary structures such as a deceleration structure or a braking structure, which will increase the cost investment. Therefore, the first oil cylinder 204 can be used to accelerate the moving disk 203, and the second oil cylinder 205 can be used to decelerate the moving disk 203 to achieve a rapid acceleration and rapid deceleration motion mode of the rotating shaft body 100, shortening the detection time. Moreover, this method can measure the moment of inertia during both the acceleration and deceleration processes of the rotating shaft body 100, thereby realizing the verification of measurement data and improving the detection accuracy; Since the operation modes of the first oil cylinder 204 and the second oil cylinder 205 are the same, the second oil cylinder 205 can also be used to provide an accelerating thrust for the moving disk 203, and the first oil cylinder 204 can be used to provide a decelerating thrust for the moving disk 203. That is, the moving disk 203 can move leftward in the outer cylinder 201 for detection or move rightward for detection. In this way, during actual detection, the moving disk 203 can reciprocate in the outer cylinder 201 to complete the detection of two rotating shaft bodies 100 within one cycle, and each rotating shaft body 100 can realize the acceleration detection and deceleration detection processes; During use, the position of the rotating shaft body 100 is fixed, and the transmission part 300 is connected to the rotating shaft body 100. The moving disk 203 is located on one side inside the outer cylinder 201. The first oil cylinder 204 is first connected to the moving disk 203, and the first oil cylinder 204 is in a compressed state, while the second oil cylinder 205 is in an extended state, as Figure 2As shown, a constant hydraulic thrust is provided to the first oil cylinder 204 and the second oil cylinder 205. The first oil cylinder 204 pushes the moving disk 203 to move. The moving disk 203 moves within the outer cylinder 201 and drives the outer cylinder 201 to rotate, thereby rotating the rotating shaft body 100. When the moving disk 203 moves to the middle of the outer cylinder 201, the first oil cylinder 204 separates from the moving disk 203. The rotating shaft body 100 continues to rotate due to inertia. The moving disk 203 continues to move within the outer cylinder 201 and contacts the second oil cylinder 205. The moving disk 203 pushes the second oil cylinder 205 to contract, and the second oil cylinder 205 provides a constant thrust to the moving disk 203 in the reverse direction until the rotating shaft body 100 stops. Thus, in the acceleration stage, by recording parameters such as the moving distance when the moving disk 203 accelerates, the pitch of the moving disk 203, the driving force of the first oil cylinder 204, and the maximum rotating speed of the rotating shaft body 100, the moment of inertia of the rotating shaft body 100 can be calculated. In the deceleration stage, by recording parameters such as the moving distance when the moving disk 203 decelerates, the pitch of the moving disk 203, the driving force of the second oil cylinder 205, and the maximum rotating speed of the rotating shaft body 100, the moment of inertia of the rotating shaft body 100 can be calculated again, thereby realizing the verification of the measured value of the moment of inertia of the rotating shaft body 100 and improving the measurement accuracy. It should be noted that during the measurement, the measurement result of the moment of inertia does not need to refer to the weight of the rotating shaft body 100, so the measurement work can be made simpler; when the first oil cylinder 204 or the second oil cylinder 205 drives the moving disk 203 to accelerate and move, the moving disk 203 is always in an accelerating state until it moves to the middle of the outer cylinder 201, and there cannot be a uniform moving phenomenon during the movement of the moving disk 203. By adopting the method of driving the rotation of the rotating shaft body 100 with hydraulic pressure, the purpose of providing a fast and constant driving force to the rotating shaft body 100 can be achieved, thereby facilitating the calculation of the moment of inertia of the rotating shaft body 100 according to the constant driving force, avoiding large errors in the calculation results caused by unstable driving forces, improving the measurement accuracy. At the same time, by measuring the moment of inertia of the rotating shaft body 100 during the acceleration and deceleration processes, the verification of the measured value can be realized, and it is convenient to shorten the detection cycle of the rotating shaft body 100 and improve the efficiency. This structural method is simple, easy to operate, and has low cost.

[0022] Since the moving disk 203 is threadedly connected to the outer cylinder 201 and moves relative to each other, to reduce the friction between them, a special setting can be made for its specific threaded connection method, specifically as Figure 2 and Figure 3As shown in the figure, a first spiral groove 206 is formed on the inner wall of the outer cylinder 201. A number of bases 207 are provided on the outer wall of the moving disk 203. A number of rolling elements 208 are rotatably provided on the bases 207. The rolling elements 208 are used in cooperation with the first spiral groove 206. By means of the rolling of the rolling elements 208 in the first spiral groove 206, the friction between the moving disk 203 and the outer cylinder 201 can be reduced, thereby reducing measurement interference and improving measurement accuracy. The number of rolling elements 208 on the bases 207 can be arranged in multiple rows according to the pitch of the first spiral groove 206. Each row of rolling elements 208 needs to be arranged along the spiral direction of the first spiral groove 206, thereby further improving the connection firmness between the moving disk 203 and the outer cylinder 201 and improving the moving stability of the moving disk 203.

[0023] During the movement of the moving disk 203, the first oil cylinder 204 or the second oil cylinder 205 needs to provide acceleration driving force and deceleration driving force for it, and the moving disk 203 needs to switch between the first oil cylinder 204 and the second oil cylinder 205. Therefore, the first oil cylinder 204 and the second oil cylinder 205 cannot only be in contact with the moving disk 203. Quick-installation structures need to be provided between the output end of the moving disk 203 and the first oil cylinder 204 and between the output end of the moving disk 203 and the second oil cylinder 205. When the first oil cylinder 204 provides a force for the moving disk 203, the first oil cylinder 204 and the moving disk 203 are connected through the corresponding quick-installation structure, thereby preventing them from separating from each other. When the moving disk 203 is separated from the first oil cylinder 204, the quick-installation structure between them is disassembled, and the moving disk 203 contacts the second oil cylinder 205 and is quickly connected through the corresponding quick-installation structure, thereby improving the moving stability of the moving disk 203. In some embodiments, the quick-installation structure can adopt structural methods such as electromagnetic adsorption, motor-controlled clamping, and hydraulic-controlled clamping to realize the connection and disassembly between the moving disk 203 and the first oil cylinder 204 or the second oil cylinder 205.

[0024] Based on the above implementation, as Figures 3 to 4 shown, the quick-installation structure includes a slot plate 209 provided at the output end of the first oil cylinder 204 or the second oil cylinder 205, a block 210 provided on the end face of the moving disk 203 and used in cooperation with the slot plate 209, and a number of slots 212 opened on the side wall of the block 210. A number of inserts 211 are slidably inserted through the slot plate 209. The inserts 211 are used in cooperation with the slots 212. In the present invention, the block 210 can be inserted into the slot plate 209, and then the connection between the slot plate 209 and the block 210 can be realized by inserting the inserts 211 into the slots 212. When disassembling, pulling the inserts 211 out of the notch 213 can quickly separate the slot plate 209 from the block 210, thereby realizing the quick connection and disassembly work between the moving disk 203 and the first oil cylinder 204 or the second oil cylinder 205. This structural method is simple and convenient to operate.

[0025] To achieve the disassembly and assembly control of the quick - installation structure and simplify the structural method, the position of the insert 211 on the slot plate 209 can be controlled by moving the slot plate 209. Specifically, as Figure 5 shown, a number of slotted notches 213 are provided on the fixed frame 202. On the inner side walls of the slotted notches 213, two guiding grooves are oppositely provided, and the two guiding grooves correspond to the first oil cylinder 204 and the second oil cylinder 205 respectively; The guiding groove includes a wire groove 214 and an inclined groove 215, and the two inclined grooves 215 are located between the two wire grooves 214; A sliding column 216 is slidably arranged in the guiding groove, and the sliding column 216 is connected to the insert 211; When the slot plate 209 moves, it will push the insert 211 and the sliding column 216 to move in the guiding groove, that is, the sliding column 216 can move in the wire groove 214 or the inclined groove 215. The two inclined grooves 215 in the two guiding grooves are located between the two wire grooves 214. When the sliding column 216 moves in the wire groove 214, the insert 211 remains inserted into the slot 212, that is, the slot plate 209 and the block 210 remain connected. When the sliding column 216 moves in the inclined groove 215, the distance between the sliding column 216 and the axis of the moving disk 203 changes. At this time, the sliding column 216 will pull the insert 211 out of the slot 212, thereby unlocking the slot plate 209 and the block 210, so that the first oil cylinder 204 or the second oil cylinder 205 can be automatically separated from the moving disk 203; during connection, due to the moving inertia of the moving disk 203, it will automatically push the corresponding block 210 into the slot plate 209, and the moving disk 203 will push the slot plate 209 to move, thereby enabling the corresponding sliding column 216 to move automatically and the corresponding insert 211 to be automatically inserted into the slot 212.

[0026] In some embodiments of the present invention, as Figure 1 and Figure 6 shown, the transmission part 300 includes a turntable 301 and a transmission shaft 302. A clamping structure for clamping the rotating shaft body 100 is provided on the turntable 301. Transmission wheels 303 are provided at both ends of the transmission shaft 302, and the two transmission wheels 303 are respectively in transmission connection with the outer cylinder 201 and the turntable 301; The turntable 301 and the transmission shaft 302 are both rotatably installed on the base 400. When the outer cylinder 201 rotates, it will drive the turntable 301 to rotate through the two transmission wheels 303 and the transmission shaft 302, so that the turntable 301 drives the rotating shaft body 100 to rotate by using the clamping structure; in some embodiments, when it is necessary to make the rotating shaft body 100 rotate forward, an annular outer edge can be provided on the end face of the turntable 301, and a transmission wheel 303 is located inside the outer edge and is in transmission connection with each other. When it is necessary to make the rotating shaft body 100 rotate reversely, a transmission wheel 303 can be directly in transmission connection with the circumferential outer wall of the turntable 301.

[0027] Based on the above implementation, as Figures 7 to 8 shown, the clamping structure includes a number of pressing units 304 circumferentially distributed on the turntable 301, and each pressing unit 304 moves synchronously along the radial direction of the turntable 301; The pressing unit 304 includes a moving body 305 slidably disposed on the end surface of the turntable 301 and a cylinder 306 disposed on the moving body 305. A long plate 307 is disposed at the end of the cylinder 306 facing the rotating shaft body 100, and the long plate 307 is used in cooperation with the keyway 308 on the rotating shaft body 100; Since the rotating shaft body 100 generally needs to be connected to other structures through a number of keyways 308 opened on the rotating shaft body 100 during use, the keyways 308 on the rotating shaft body 100 can be directly borrowed to improve the clamping effect of the clamping structure; the number of pressing units 304 in the clamping structure can be the same as the number of keyways 308, and a number of keyways 308 need to be distributed in the circumferential direction of the rotating shaft body 100; since a number of pressing units 304 move synchronously on the turntable 301, a number of pressing units 304 can perform the shaft fixing work on the rotating shaft body 100 while clamping the rotating shaft body 100, thereby limiting the rotation axis of the rotating shaft body 100, and cooperating with a number of pressure rollers 102 to fix the rotating shaft body 100, so as to achieve the double fastening work on the rotating shaft body 100; During use, a plurality of moving bodies 305 can move synchronously closer to each other on the turntable 301. The moving body 305 drives the cylinder 306 and the long plate 307 to move toward the outer wall direction of the rotating shaft body 100, and the long plate 307 can be smoothly inserted into the keyway 308. Thus, the keyway 308 can be used to achieve the clamping and fastening effect on the rotating shaft body 100, and this method can effectively prevent the rotating shaft body 100 from freely moving in its axial direction and circumferential direction, keep the rotating shaft body 100 in a synchronous movement state with the turntable 301, and this method can avoid squeezing and damaging the outer wall of the rotating shaft body 100; To achieve the synchronous movement of a number of moving bodies 305, as Figure 10 shown, an adjustment disk 314 can be coaxially and rotatably disposed on the end surface of the turntable 301. The adjustment disk 314 is rotatably connected to each moving body 305 through a connecting rod 315. In this way, when the adjustment disk 314 rotates, it can drive a plurality of moving bodies 305 to move synchronously by using a plurality of connecting rods 315; the adjustment disk 314 can be fastened to the turntable 301 by bolts.

[0028] Due to the different widths of the key grooves 308 on different rotating shafts 100, if only one specification of the long plate 307 is used, it cannot be used in conjunction with key grooves 308 of multiple specifications. And if a long plate 307 is configured for each specification of the key groove 308, the cost will be significantly increased. To solve this problem, a method can be adopted to enable the long plate 307 to rotate within the key groove 308. That is, when the width of the key groove 308 is relatively large and there is a gap between the long plate 307 and the inner wall of the key groove 308, the long plate 307 can be directly rotated so that both ends of the long plate 307 abut against the corresponding inner walls of the key groove 308. In this way, the clamping of the key groove 308 can also be achieved. Specifically, as Figure 8 shown, the column 306 passes through the moving body 305 and moves relative to it. A second spiral groove 309 is formed on the outer wall of the column 306, and a rib that cooperates with the second spiral groove 309 is provided on the moving body 305. The column 306 and the moving body 305 are connected by an elastic body 310; The elastic body 310 can provide an elastic acting force for the moving body 305 and the column 306. In the natural state, the long plate 307 remains parallel to the axis of the turntable 301, which can reduce the occupied area of the long plate 307 in the width direction of the key groove 308. When it is necessary to fasten the rotating shaft 100, the moving body 305 moves towards the axis direction of the turntable 301, and the moving body 305 drives the long plate 307 to insert into the key groove 308. At this time, the long plate 307 cannot move. As the moving body 305 continues to move, the moving body 305 and the column 306 move relative to each other. By using the second spiral groove 309 and the rib, the rotation of the column 306 can be driven by the movement of the moving body 305, so that the long plate 307 is tilted. In this way, the clamping of the key groove 308 of any width by the long plate 307 can be achieved, and this method can realize multiple fastening operations in the radial direction, axis direction, and circumferential direction of the rotating shaft 100; the elastic body 310 mainly provides a reset elastic force for the column 306.

[0029] Based on the above implementation, as Figure 9 shown, two top blocks 311 are rotatably arranged on the long plate 307. A flat surface is provided on the top block 311 for fitting with the inner side wall of the key groove 308. The top block 311 and the long plate 307 are connected by a spring piece 312; If only the side of the long plate 307 is abutted against the inner wall of the key groove 308, since the abutting position is generally in a line contact mode, the pressure will be relatively concentrated, which will cause damage to the long plate 307 and the rotary shaft body 100. Therefore, it is necessary to adjust its contact mode to a surface contact mode, that is, by means of the top block 311, to achieve the surface contact mode between the long plate 307 and the key groove 308. And since the top block 311 can rotate on the long plate 307, the long plate 307 at any rotation angle can be in surface contact with the key groove 308. The elastic piece 312 can be used to provide a reset elastic force for the top block 311; to simplify the connection mode between the elastic piece 312 and the top block 311, a groove 313 can be provided on the top block 311, and the end of the elastic piece 312 can be snapped into the groove 313.

[0030] The method for measuring the moment of inertia of a high-speed rotary shaft body, using the above-mentioned measuring device for the moment of inertia of a high-speed rotary shaft body, includes the following steps: Fix the position of the rotary shaft body 100 and allow the rotary shaft body 100 to freely rotate about its own axis; Use the transmission part 300 to drive the driving part 200 to be in transmission connection with the rotary shaft body 100; In the initial state, the moving disk 203 is located on one side inside the outer cylinder 201, the first oil cylinder 204 is in a contracted state, and the first oil cylinder 204 is connected to the moving disk 203, and the second oil cylinder 205 is in an extended state; Provide equal and constant hydraulic pressures for the first oil cylinder 204 and the second oil cylinder 205. The first oil cylinder 204 provides a constant thrust for the moving disk 203, and the moving disk 203 moves horizontally; The threaded connection state between the moving disk 203 and the outer cylinder 201 will cause the outer cylinder 201 to rotate. The outer cylinder 201 drives the rotary shaft body 100 to rotate through the transmission part 300; When the moving disk 203 moves to the midpoint position between the first oil cylinder 204 and the second oil cylinder 205, record the moving distance data of the moving disk 203 and the rotation speed data of the rotary shaft body 100, and calculate the moment of inertia of the rotary shaft body 100 by using the recorded data, the pitch of the moving disk 203, and the hydraulic pressure value of the first oil cylinder 204; At the midpoint position, the moving disk 203 is separated from the first oil cylinder 204, and the moving disk 203 will continue to move and squeeze the second oil cylinder 205 due to the rotational inertia of the rotary shaft body 100, and the second oil cylinder 205 contracts; Record the moving distance of the moving disk 203 when the rotary shaft body 100 stops rotating, and calculate the moment of inertia of the rotary shaft body 100 again according to the maximum rotation speed of the rotary shaft body 100, the moving distance of the moving disk 203, the pitch of the moving disk 203, and the hydraulic pressure value of the second oil cylinder 205 to calibrate the moment of inertia value.

[0031] Using the above method, the active drive detection mode and the rapid detection mode of the rotating shaft body 100 can be realized, greatly improving the detection efficiency, shortening the detection cycle, and by detecting the data when the rotating shaft body 100 is accelerating and decelerating, the two measurements of the moment of inertia of the rotating shaft body 100 in the two motion processes can be realized, thus facilitating the verification of the moment of inertia.

[0032] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A measuring device for the moment of inertia of a high-speed rotating shaft body, characterized in that, It includes a tachometer for measuring the rotation speed of the rotating shaft body, a driving part for providing power for the rotation movement of the rotating shaft body, and a transmission part for transmitting the power output by the driving part to the rotating shaft body; The driving part includes an outer cylinder and a fixing frame passing through the outer cylinder. A moving disk is slidably arranged on the fixing frame. The moving disk is located inside the outer cylinder and is screwed to the outer cylinder. One end of the fixing frame is provided with a first oil cylinder for providing power for the movement of the moving disk. When the moving disk moves, the outer cylinder rotates, and the outer cylinder transmits power to the rotating shaft body through the transmission part; Wherein, the other end of the fixing frame is provided with a second oil cylinder. When one of the first oil cylinder and the second oil cylinder pushes the moving disk to move to a specified position and separates from each other, the moving disk presses the other one of the first oil cylinder and the second oil cylinder due to inertia.

2. The moment of inertia measuring device for a high-speed rotating shaft body according to claim 1, characterized in that, A first spiral groove is formed on the inner wall of the outer cylinder. A plurality of bases are arranged on the outer wall of the moving disk. A plurality of rolling bodies are rotatably arranged on the bases, and the rolling bodies are used in cooperation with the first spiral groove.

3. The moment of inertia measuring device for the high-speed rotating shaft body according to claim 1, characterized in that Quick-installation structures are arranged between the moving disk and the output end of the first oil cylinder and between the moving disk and the output end of the second oil cylinder.

4. The moment of inertia measuring device for a high-speed rotating shaft body according to claim 3, wherein, The quick-installation structure includes a clamping groove plate arranged on the output end of the first oil cylinder or the second oil cylinder, a clamping block arranged on the end face of the moving disk and used in cooperation with the clamping groove plate, and a plurality of slots formed on the side wall of the clamping block. A plurality of inserting bodies are slidably inserted through the clamping groove plate, and the inserting bodies are used in cooperation with the slots.

5. The moment of inertia measuring device for a high-speed rotating shaft body according to claim 4, characterized in that A plurality of slotted grooves are formed on the fixing frame. Two guiding grooves are oppositely formed on the inner side wall of the slotted grooves, and the two guiding grooves correspond to the first oil cylinder and the second oil cylinder respectively; The guiding groove includes a wire groove and an inclined groove, and the two inclined grooves are located between the two wire grooves; A sliding column is slidably arranged in the guiding groove, and the sliding column is connected with the inserting body.

6. The moment of inertia measuring device for a high-speed rotating shaft body according to claim 1, wherein The transmission part includes a turntable and a transmission shaft. A clamping structure for clamping the rotating shaft body is arranged on the turntable. Transmission wheels are arranged at both ends of the transmission shaft, and the two transmission wheels are respectively in transmission connection with the outer cylinder and the turntable.

7. The moment of inertia measuring device for the high-speed rotating shaft body according to claim 6, characterized in that, The clamping structure includes a plurality of pressing units circumferentially distributed on the turntable, and each pressing unit moves synchronously along the radial direction of the turntable; The pressing unit includes a moving body slidably arranged on the end face of the turntable and a column arranged on the moving body. A long plate is arranged at the end of the column facing the rotating shaft body, and the long plate is used in cooperation with the key groove on the rotating shaft body.

8. The moment of inertia measuring device for a high-speed rotating shaft body according to claim 7, wherein The column passes through the moving body and moves relative to it. A second spiral groove is formed on the outer wall of the column. A rib is arranged on the moving body and used in cooperation with the second spiral groove. The column and the moving body are connected through an elastic body.

9. The moment of inertia measuring device for a high-speed rotating shaft body according to claim 8, characterized in that Two top blocks are relatively rotatably arranged on the long plate. A plane is arranged on the top block, and the plane is used for fitting with the inner side wall of the key groove. The top block and the long plate are connected through a spring piece.

10. A method for measuring the moment of inertia of a high-speed rotating shaft body, using the high-speed rotating shaft body moment of inertia measuring device according to any one of claims 1-9, characterized in that, It includes the following steps: Fix the position of the rotating shaft body and allow the rotating shaft body to freely rotate around its own axis; The driving part is used to drive the driving part and the rotary shaft body to be in transmission connection; In the initial state, the moving disk is located on one side inside the outer cylinder, the first oil cylinder is in a contracted state, and the first oil cylinder is connected to the moving disk, and the second oil cylinder is in an extended state; Equal and constant hydraulic pressure is provided for the first oil cylinder and the second oil cylinder. The first oil cylinder provides a constant thrust for the moving disk, and the moving disk moves laterally; The threaded connection state between the moving disk and the outer cylinder causes the outer cylinder to rotate, and the outer cylinder drives the rotary shaft body to rotate through the transmission part; When the moving disk moves to the midpoint position between the first oil cylinder and the second oil cylinder, record the moving distance data of the moving disk and the rotational speed data of the rotary shaft body, and calculate the moment of inertia of the rotary shaft body by using the recorded data, the pitch of the moving disk, and the hydraulic pressure value of the first oil cylinder; At the midpoint position, the moving disk is separated from the first oil cylinder, and the moving disk will continue to move and press the second oil cylinder due to the rotational inertia of the rotary shaft body, and the second oil cylinder contracts; Record the moving distance of the moving disk when the rotary shaft body stops rotating, and calculate the moment of inertia of the rotary shaft body again according to the maximum rotational speed of the rotary shaft body, the moving distance of the moving disk, the pitch of the moving disk, and the hydraulic pressure value of the second oil cylinder to calibrate the moment of inertia value.

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