High-speed rotating shaft moment of inertia measurement device and method

Abstract

The present invention relates to the technical field of measuring devices, and in particular to a high-speed rotating shaft moment of inertia measuring device and method. The device comprises a tachometer for measuring the rotational speed of the rotating shaft, a drive unit for providing power for the rotational motion of the rotating shaft, and a transmission unit for transmitting the power output by the drive unit to the rotating shaft. By adopting a hydraulic drive to rotate the rotating shaft, the purpose of providing a fast and constant driving force for the rotating shaft can be achieved, thereby facilitating the calculation of the rotational inertia of the rotating shaft based on the constant driving force, avoiding large errors in the calculation results caused by unstable driving force, and improving measurement accuracy. At the same time, by measuring the rotational inertia of the rotating shaft during acceleration and deceleration, the measurement value can be verified, and the rotating shaft detection cycle can be shortened to improve efficiency. The structural method is simple, easy to operate, and low in cost.

Description

Technical Field

[0001] The present invention relates to the technical field of measuring devices, and in particular to a device and method for measuring the moment of inertia of a high-speed rotating shaft. 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 object's angular acceleration when subjected to an external torque. Due to the increasing application of high-speed rotating shafts in aerospace, new energy (such as wind turbines and flywheel energy storage systems), precision machine tools, and electric vehicle drive systems, the moment of inertia of the rotating shaft, as a core dynamic parameter, directly affects its acceleration performance, vibration characteristics, and energy efficiency. Especially under high-speed conditions, slight deviations 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 shafts has become an indispensable part of industrial design and quality control.

[0003] Currently, the measurement of moment of inertia mainly relies on traditional methods such as the torsion pendulum method, the falling body method, and the three-wire pendulum method. However, these technologies generally have obvious limitations:

[0004] Low-speed limitation: Traditional devices are mostly based on static or quasi-static assumptions, and the measurement process relies on low-frequency vibration or gravity drive, which cannot adapt to the dynamic characteristics of high-speed rotation;

[0005] The passive nature of measurement: Traditional devices rely on forces such as gravity or elasticity to drive the object to reciprocate and record the reciprocating cycle and time. This results in long measurement times and makes it impossible to achieve active, fast measurement.

[0006] Reciprocating motion limitations: Traditional measurement methods mainly utilize reciprocating motion, while the measurement of rotating shafts requires continuous, unidirectional rotation;

[0007] Unstable force: It is impossible to provide a constant unidirectional driving force for the rotating shaft, which makes the calculation of the moment of inertia prone to errors. Summary of the Invention

[0008] The present invention provides a high-speed rotating shaft moment of inertia measurement device and method, which can effectively solve the problems in the background technology.

[0009] In order to achieve the above object, the technical solution adopted by the present invention is:

[0010] A high-speed rotating shaft moment of inertia measuring device, comprising a tachometer for measuring the rotational speed of the rotating shaft, a drive unit for providing power for the rotational motion of the rotating shaft, and a transmission unit for transmitting the power output by the drive unit to the rotating shaft;

[0011] The driving part includes an outer cylinder and a fixed frame passing through the outer cylinder, a movable disk is slidably provided on the fixed frame, the movable disk is located inside the outer cylinder, and the movable disk is screwed to the outer cylinder, and one end of the fixed frame is provided with a first oil cylinder for providing power for the movement of the movable disk, and when the movable disk moves, the outer cylinder rotates, and the outer cylinder transmits power to the rotating shaft through the transmission part;

[0012] A second oil cylinder is provided at the other end of the fixed frame. When one of the first oil cylinder and the second oil cylinder pushes the movable plate to move to a specified position and separates from each other, the movable plate squeezes the other of the first oil cylinder and the second oil cylinder due to inertia.

[0013] In some embodiments of the present invention, a spiral groove 1 is provided on the inner wall of the outer cylinder, a plurality of bases are provided on the outer wall of the movable disk, a plurality of rolling bodies are rotatably provided on the bases, and the rolling bodies are used in conjunction with the spiral groove 1.

[0014] In some embodiments of the present invention, a quick-install structure is provided between the movable plate and the output end of the first oil cylinder, and between the movable plate and the output end of the second oil cylinder.

[0015] In some embodiments of the present invention, the quick-release structure includes a slot plate arranged on the output end of the first oil cylinder or the output end of the second oil cylinder, a card block arranged on the end surface of the movable disk and used in conjunction with the slot plate, and a plurality of slots opened on the side wall of the card block, and a plurality of inserts are slidably inserted into the slot plate, and the inserts are used in conjunction with the slots.

[0016] In some embodiments of the present invention, the fixing frame is provided with a plurality of slots, and two guide slots are provided on inner side walls of the slots, the two guide slots corresponding to the first oil cylinder and the second oil cylinder respectively.

[0017] The guide groove includes a line groove and an oblique groove, and the two oblique grooves are located between the two line grooves;

[0018] A sliding post is slidably arranged in the guide groove, and the sliding post is connected to the inserting body.

[0019] In some embodiments of the present invention, the transmission part includes a turntable and a transmission shaft, the turntable is provided with a clamping structure for clamping the rotating shaft body, and transmission wheels are provided at both ends of the transmission shaft, and the two transmission wheels are respectively connected to the outer cylinder and the turntable.

[0020] In some embodiments of the present invention, the clamping structure includes a plurality of pressing units distributed circumferentially on the turntable, and each of the pressing units moves synchronously along the radial direction of the turntable;

[0021] The pressing unit includes a moving body slidably arranged on the end surface of the turntable and a column arranged 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 conjunction with a key groove on the rotating shaft body.

[0022] In some embodiments of the present invention, the column passes through the movable body and moves relative to it, a spiral groove 2 is provided on the outer wall of the column, and a rib is provided on the movable body for use with the spiral groove 2, and the column and the movable body are connected by an elastic body.

[0023] In some embodiments of the present invention, two top blocks are arranged on the long plate for relative rotation, and a plane is provided on the top block, which is used to fit with the inner wall of the keyway, and the top block is connected to the long plate by a spring sheet.

[0024] A method for measuring the moment of inertia of a high-speed rotating shaft body, using the above-mentioned high-speed rotating shaft body moment of inertia measuring device, comprises the following steps:

[0025] The position of the rotating shaft is fixed and the rotating shaft is allowed to rotate freely about its own axis;

[0026] The driving part is connected to the rotating shaft by the transmission part;

[0027] In the initial state, the movable plate is located at one side of the outer cylinder, the first oil cylinder is in a contracted state and connected to the movable plate, and the second oil cylinder is in an extended state;

[0028] providing equal and constant hydraulic pressure to the first oil cylinder and the second oil cylinder, wherein the first oil cylinder provides a constant thrust to the movable plate, and the movable plate moves laterally;

[0029] The threaded connection between the movable disk and the outer cylinder causes the outer cylinder to rotate, and the outer cylinder drives the rotary shaft to rotate through the transmission part;

[0030] When the movable plate moves to the midpoint between the first oil cylinder and the second oil cylinder, the movable plate movement distance data and the rotation speed data of the rotary shaft are recorded, and the rotational inertia of the rotary shaft is calculated using the recorded data, the movable plate pitch, and the hydraulic pressure value of the first oil cylinder;

[0031] At the midpoint, the movable plate is separated from the first oil cylinder, and the movable plate continues to move and squeeze the second oil cylinder due to the rotational inertia of the rotating shaft, causing the second oil cylinder to contract;

[0032] The moving distance of the movable disk when the rotating shaft stops rotating is recorded, and the rotational inertia of the rotating shaft is calculated again according to the maximum rotation speed of the rotating shaft, the moving distance of the movable disk, the pitch of the movable disk, and the hydraulic pressure value of the second cylinder to calibrate the rotational inertia value.

[0033] The technical solution of the present invention has the following effects:

[0034] By adopting the method of hydraulically driving the rotation of the rotating shaft, the purpose of providing the rotating shaft with a fast and constant driving force can be achieved, thereby facilitating the calculation of the rotational inertia of the rotating shaft based on the constant driving force, avoiding large errors in the calculation results caused by unstable driving force, and improving measurement accuracy. At the same time, by measuring the rotational inertia of the rotating shaft during acceleration and deceleration, the measurement value can be verified, and the rotating shaft detection cycle can be shortened to improve efficiency. This structural method is simple, easy to operate, and low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 It is a structural schematic diagram of the present invention;

[0037] Figure 2 This is a schematic diagram of the exploded structure of the driving part in an embodiment of the present invention;

[0038] Figure 3 is a schematic diagram of a movable disk and structures thereon in an embodiment of the present invention;

[0039] Figure 4 is a schematic structural diagram of a movable disk in an embodiment of the present invention;

[0040] Figure 5 This is a schematic diagram of a partial cross-sectional structure of a fixing frame in an embodiment of the present invention;

[0041] Figure 6 Schematic diagram of the structure of the turntable and the rotating shaft body in an embodiment of the present invention;

[0042] Figure 7 2 is a schematic structural diagram of a rotating shaft and a clamping structure thereon in an embodiment of the present invention;

[0043] Figure 8 2 is a schematic structural diagram of a pressing unit in an embodiment of the present invention;

[0044] Figure 9 2 is a schematic structural diagram of a top block according to an embodiment of the present invention;

[0045] Figure 10 yes Figure 6 Schematic diagram of the structure of the turntable from another perspective.

[0046] Reference numerals:

[0047] 100, rotating shaft; 101, tachometer; 102, pressure roller;

[0048] 200, driving unit; 201, outer cylinder; 202, fixed frame; 203, movable plate; 204, first oil cylinder; 205, second oil cylinder; 206, spiral groove 1; 207, base; 208, rolling element; 209, slot plate; 210, clamping block; 211, insert; 212, slot; 213, slot; 214, wire trough; 215, inclined slot; 216, sliding column;

[0049] 300, transmission unit; 301, turntable; 302, transmission shaft; 303, transmission wheel; 304, pressing unit; 305, moving body; 306, column; 307, long plate; 308, keyway; 309, spiral groove 2; 310, elastic body; 311, top block; 312, spring piece; 313, groove; 314, adjustment plate; 315, connecting rod;

[0050] 400. Base. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0053] like Figures 1 to 2 As shown, the high-speed rotating shaft moment of inertia measuring device of the present invention includes a tachometer 101 for measuring the rotation speed of the rotating shaft 100, a driving unit 200 for providing power for the rotation motion of the rotating shaft 100, and a transmission unit 300 for transmitting the power output by the driving unit 200 to the rotating shaft 100;

[0054] The driving unit 200 includes an outer cylinder 201 and a fixed frame 202 passing through the outer cylinder 201. A movable disk 203 is slidably mounted on the fixed frame 202. The movable disk 203 is located inside the outer cylinder 201 and is threadedly connected to the outer cylinder 201. A first oil cylinder 204 is provided at one end of the fixed frame 202 for providing power for the movable disk 203 to move. When the movable disk 203 moves, the outer cylinder 201 rotates, and the outer cylinder 201 transmits power to the rotating shaft 100 through the transmission unit 300.

[0055] A second oil cylinder 205 is provided at the other end of the fixed frame 202. When one of the first oil cylinder 204 and the second oil cylinder 205 pushes the movable plate 203 to move to a specified position and separate from each other, the movable plate 203 squeezes the other of the first oil cylinder 204 and the second oil cylinder 205 due to inertia.

[0056] In the present invention, the rotating 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 set on the base 400, and the fixing frame 202 is relatively fixed to the base 400. In order to fix the rotating shaft body 100, a plurality of pressure rollers 102 can be set in the circumferential direction of the rotating shaft body 100; the speed meter 101 is installed on a pressure roller 102 and is used to measure the rotation speed of the pressure roller 102, thereby measuring the rotation speed of the rotating shaft body 100. According to the diameter of the rotating shaft body 100, the angular velocity of the rotating shaft body 100 can be calculated. Of course, the angular velocity measuring instrument can also be used to directly measure the rotation angular velocity of the rotating shaft body 100. The driving part 200 can transmit power to the rotating shaft body 100 through the transmission part 300, thereby driving the rotating shaft body 100 to rotate. In this way, the direct connection between the driving part 200 and the rotating shaft body 100 can be avoided, which is convenient for structural assembly and position adjustment. When testing rotating shaft bodies 100 with different diameters, it is only necessary to adjust the positions of the corresponding pressure rollers 102, without adjusting 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 rotational inertia when running, before testing the rotating shaft body 100, it is necessary to measure the rotational inertia of the driving part 200 and the transmission part 300 when they are running at no load, so as to improve the detection accuracy.

[0057] In order to achieve the effect of providing a fast and constant driving force to the rotating shaft body 100, a hydraulic drive can be used. However, the motor drive in the traditional way cannot be used because its output torque cannot be constant. In addition, the torque output by a piston in a traditional hydraulic motor is also constantly changing during a reciprocating motion cycle, so it is also unable to provide a constant force. For other conventional driving methods, they are also unable to 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 movable plate 203 to move, and utilize the screw connection relationship between the movable plate 203 and the outer cylinder 201 to drive the outer cylinder 201 to rotate. The outer cylinder 201 then transmits power to the rotating shaft body 100 to achieve the effect of providing a fast and constant driving force to the rotating shaft body 100.

[0058] 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 static to rotation to the maximum speed, and the process of decelerating from the maximum speed to static of the rotating shaft body 100 cannot be effectively utilized, and the deceleration process of the rotating shaft body 100 also needs to be configured with auxiliary structures such as a deceleration structure or a brake structure, which will increase the cost investment. Therefore, the first oil cylinder 204 can be used to accelerate the movable disk 203 and the second oil cylinder 205 can be used to decelerate the movable disk 203 to realize the fast acceleration and fast deceleration movement mode of the rotating shaft body 100, shortening the detection time. In addition, this method can measure the moment of inertia during the acceleration and deceleration processes of the rotating shaft body 100, thereby realizing the verification of the measurement data and improving the detection accuracy.

[0059] Since the first oil cylinder 204 and the second oil cylinder 205 operate in the same manner, the second oil cylinder 205 can also provide an accelerating thrust for the movable plate 203, and the first oil cylinder 204 can provide a decelerating thrust for the movable plate 203. That is, the movable plate 203 can move leftward or rightward within the outer cylinder 201 for detection. In this way, during actual detection, the movable plate 203 can reciprocate within the outer cylinder 201 within one cycle to realize detection of two rotating shafts 100, and each rotating shaft 100 can realize acceleration detection and deceleration detection processes.

[0060] When in 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 movable plate 203 is located on one side of the outer cylinder 201, the first oil cylinder 204 is first connected to the movable plate 203, and the first oil cylinder 204 is in a compressed state, and the second oil cylinder 205 is in an extended state, as shown in FIG. 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 movable plate 203 to move, and the movable plate 203 moves in the outer cylinder 201 and drives the outer cylinder 201 to rotate, thereby rotating the rotary shaft body 100. When the movable plate 203 moves to the middle of the outer cylinder 201, the first oil cylinder 204 separates from the movable plate 203, and the rotary shaft body 100 continues to rotate due to inertia. The movable plate 203 continues to move in the outer cylinder 201 and contacts the second oil cylinder 205. The movable plate 203 pushes the second oil cylinder 205 to contract, and the second oil cylinder 205 provides a constant thrust to the movable plate 203 in the opposite direction. , until the rotating shaft body 100 stops. Therefore, in the acceleration stage, the rotational inertia of the rotating shaft body 100 can be calculated by recording the moving distance of the moving disk 203 during acceleration, the pitch of the moving disk 203, the driving force of the first oil cylinder 204, the maximum rotation speed of the rotating shaft body 100 and other parameters. In the deceleration stage, the rotational inertia of the rotating shaft body 100 can be calculated again by recording the moving distance of the moving disk 203 during deceleration, the pitch of the moving disk 203, the driving force of the second oil cylinder 205, the maximum rotation speed of the rotating shaft body 100 and other parameters, thereby realizing the verification of the measurement value of the rotational inertia of the rotating shaft body 100 and improving the measurement accuracy;

[0061] It should be noted that, during measurement, the measurement result of the moment of inertia does not need to refer to the weight of the rotating shaft 100, thus making the measurement work simpler; when the first oil cylinder 204 or the second oil cylinder 205 drives the movable plate 203 to accelerate, the movable plate 203 is always in an accelerated state until it moves to the middle of the outer cylinder 201, and the movable plate 203 cannot move at a uniform speed during its movement;

[0062] By adopting the method of hydraulically driving the rotating shaft body 100 to rotate, the purpose of providing the rotating shaft body 100 with a fast and constant driving force can be achieved, thereby facilitating the calculation of the rotational inertia of the rotating shaft body 100 based on the constant driving force, avoiding large errors in the calculation results caused by unstable driving force, and improving measurement accuracy. At the same time, by measuring the rotational inertia of the rotating shaft body 100 during acceleration and deceleration, the measurement value can be verified, and the detection cycle of the rotating shaft body 100 can be shortened, thereby improving efficiency. This structural method is simple, easy to operate, and low in cost.

[0063] Since the movable disk 203 is threadedly connected to the outer cylinder 201 and moves relative to each other, in order to reduce the friction between them, the specific thread connection method can be specially set, as shown in FIG. Figure 2 and Figure 3As shown, a spiral groove 206 is provided on the inner wall of the outer cylinder 201, and a plurality of bases 207 are provided on the outer wall of the movable disk 203. A plurality of rolling bodies 208 are rotatably provided on the base 207, and the rolling bodies 208 are used in conjunction with the spiral groove 206. By utilizing the rolling bodies 208 to roll in the spiral groove 206, the friction between the movable disk 203 and the outer cylinder 201 can be reduced, thereby reducing measurement interference and improving measurement accuracy. The plurality of rolling bodies 208 on the base 207 can be arranged into multiple rows according to the pitch of the spiral groove 206, and the rolling bodies 208 in each row need to be arranged along the spiral direction of the spiral groove 206, thereby further improving the connection firmness between the movable disk 203 and the outer cylinder 201 and improving the movement stability of the movable disk 203.

[0064] When the movable plate 203 is moving, the first oil cylinder 204 or the second oil cylinder 205 needs to provide it with an accelerating driving force and a decelerating driving force, and the movable plate 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 just be in contact with the movable plate 203. A quick-install structure needs to be provided between the movable plate 203 and the output end of the first oil cylinder 204, and between the movable plate 203 and the output end of the second oil cylinder 205. When the first oil cylinder 204 provides a force for the movable plate 203, the first oil cylinder 204 and the second oil cylinder 205 are switched. The cylinder 204 and the movable plate 203 are connected by a corresponding quick-install structure to avoid separation. When the movable plate 203 is separated from the first cylinder 204, the quick-install structure therebetween is disassembled, and the movable plate 203 contacts the second cylinder 205 and is quickly connected through the corresponding quick-install structure, thereby improving the stability of the movement of the movable plate 203. In some embodiments, the quick-install structure can adopt electromagnetic adsorption, motor-controlled clamping, hydraulic-controlled clamping and other structural methods to realize the connection and separation of the movable plate 203 and the first cylinder 204 or the second cylinder 205.

[0065] Based on the above implementation, Figures 3 and 4 As shown, the quick-install structure includes a slot plate 209 provided on the output end of the first oil cylinder 204 or the output end of the second oil cylinder 205, a clamping block 210 provided on the end surface of the movable plate 203 and used in conjunction with the slot plate 209, and a plurality of slots 212 provided on the side wall of the clamping block 210. A plurality of inserts 211 are slidably inserted into the slot plate 209, and the inserts 211 are used in conjunction with the slots 212.

[0066] In the present invention, the card block 210 can be inserted into the card slot plate 209, and then the card slot plate 209 and the card block 210 can be connected by inserting the plug 211 into the slot 212. When disassembling, the card slot plate 209 and the card block 210 can be quickly separated by pulling the plug 211 out of the slot 213, thereby realizing the rapid connection and disassembly of the movable disk 203 and the first cylinder 204 or the second cylinder 205. This structure is simple and easy to operate.

[0067] In order to realize the assembly and disassembly control of the quick assembly structure and simplify the structure, the position of the insert 211 on the slot plate 209 can be controlled by moving the slot plate 209. Figure 5 As shown, a plurality of slots 213 are formed on the fixing frame 202, and two guide slots are formed on the inner sidewalls of the slots 213. The two guide slots correspond to the first oil cylinder 204 and the second oil cylinder 205 respectively.

[0068] The guide groove includes a line groove 214 and an oblique groove 215 , and the two oblique grooves 215 are located between the two line grooves 214 ;

[0069] A sliding post 216 is slidably provided in the guide groove, and the sliding post 216 is connected to the insert 211;

[0070] When the card slot plate 209 moves, it pushes the insert 211 and the slide 216 to move in the guide groove, that is, the slide 216 can move in the line groove 214 or the inclined groove 215. The two inclined grooves 215 in the two guide grooves are located between the two line grooves 214. When the slide 216 moves in the line groove 214, the insert 211 remains inserted into the slot 212, that is, the card slot plate 209 and the card block 210 remain connected. When the slide 216 moves in the inclined groove 215, the distance between the slide 216 and the axis of the movable plate 203 is 0.01mm. When the distance changes, the sliding column 216 will pull the plug 211 out of the slot 212, thereby unlocking the slot plate 209 and the block 210, so that the first cylinder 204 or the second cylinder 205 can be automatically separated from the movable disk 203; when connected, due to the inertia of the movable disk 203, it will automatically push the corresponding block 210 to insert into the slot plate 209, and the movable disk 203 will push the slot plate 209 to move, thereby causing the corresponding sliding column 216 to move automatically, and the corresponding plug 211 to automatically insert into the slot 212.

[0071] In some embodiments of the present invention, Figure 1 and Figure 6 As shown, the transmission part 300 includes a turntable 301 and a transmission shaft 302. The turntable 301 is provided with a clamping structure for clamping the rotating shaft body 100. Both ends of the transmission shaft 302 are provided with transmission wheels 303. The two transmission wheels 303 are respectively connected to the outer cylinder 201 and the turntable 301 for transmission.

[0072] The turntable 301 and the transmission shaft 302 are both rotatably mounted on the base 400. When the outer cylinder 201 rotates, it drives 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 using the clamping structure; in some embodiments, when it is necessary to rotate the rotating shaft body 100 in the forward direction, an annular outer edge can be set on the end face of the turntable 301, and a transmission wheel 303 is located on the inner side of the outer edge and is connected to each other in transmission. When it is necessary to rotate the rotating shaft body 100 in the reverse direction, a transmission wheel 303 can be directly connected to the circumferential outer wall of the turntable 301 in transmission.

[0073] Based on the above implementation, Figures 7 and 8 As shown, the clamping structure includes a plurality of pressing units 304 distributed circumferentially on the turntable 301, and each pressing unit 304 moves synchronously along the radial direction of the turntable 301;

[0074] The pressing unit 304 includes a moving body 305 slidably mounted on the end surface of the rotary disk 301 and a column 306 mounted on the moving body 305. The end of the column 306 facing the rotating shaft 100 is provided with a long plate 307, which cooperates with a keyway 308 on the rotating shaft 100.

[0075] Since the rotary shaft body 100 generally needs to be connected to other structures through a plurality of key grooves 308 provided on the rotary shaft body 100 when in use, the key grooves 308 on the rotary shaft body 100 can be directly used to improve the clamping effect of the clamping structure; the number of pressing units 304 in the clamping structure can be consistent with the number of key grooves 308, and the plurality of key grooves 308 need to be distributed in the circumferential direction of the rotary shaft body 100; since the plurality of pressing units 304 move synchronously on the turntable 301, the plurality of pressing units 304 can achieve the fixed axis work of the rotary shaft body 100 while clamping the rotary shaft body 100, thereby limiting the rotation axis of the rotary shaft body 100, cooperating with the plurality of pressing rollers 102 to fix the rotary shaft body 100, thereby achieving double fastening of the rotary shaft body 100;

[0076] When in use, multiple moving bodies 305 can be synchronously approached to each other on the turntable 301, and the moving bodies 305 drive the column 306 and the long plate 307 to move toward the outer wall of the rotating shaft body 100, and the long plate 307 can be smoothly inserted into the key groove 308, thereby utilizing the key groove 308 to achieve a 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, so that the rotating shaft body 100 maintains a synchronous movement state with the turntable 301, and this method can also avoid extrusion damage to the outer wall of the rotating shaft body 100;

[0077] To achieve the synchronous movement of several moving bodies 305, such as Figure 10 As shown, an adjustment disk 314 can be coaxially and rotatably arranged on the end face of the turntable 301, and the adjustment disk 314 is rotatably connected to each moving body 305 via a connecting rod 315. In this way, when the adjustment disk 314 rotates, it can use multiple connecting rods 315 to drive multiple moving bodies 305 to move synchronously; the adjustment disk 314 can be fastened to the turntable 301 by bolts.

[0078] Since the widths of the key slots 308 on different rotating shaft bodies 100 are different, if only one specification of long plate 307 is used, it cannot be used in conjunction with key slots 308 of multiple specifications. If a long plate 307 is configured for each specification of key slot 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 slot 308. That is, when the key slot 308 is large in width and there is a gap between the long plate 307 and the inner wall of the key slot 308, the long plate 307 can be directly rotated so that the two ends of the long plate 307 abut against the corresponding inner walls of the key slot 308. In this way, the clamping work of the key slot 308 can also be achieved. Figure 8 As shown, the column 306 passes through the moving body 305 and moves relative to it. A second spiral groove 309 is provided on the outer wall of the column 306. The moving body 305 is provided with a rib that cooperates with the second spiral groove 309. The column 306 and the moving body 305 are connected by an elastic body 310.

[0079] The elastic body 310 can provide elastic 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 area occupied by the long plate 307 along the width direction of the key slot 308. When the rotating shaft body 100 needs to be tightened, the moving body 305 moves toward the axis of the turntable 301, and the moving body 305 drives the long plate 307 to insert into the key slot 308. At this time, the long plate 307 cannot move. 305 continues to move, the movable body 305 and the column 306 move relative to each other, and the spiral groove 309 and the ribs can be used to drive the column 306 to rotate with the help of the movement of the movable body 305, so that the long plate 307 can be tilted, so that the long plate 307 can be clamped to the key groove 308 of any width, and this method can realize multiple fastening operations of the rotating shaft 100 in the radial direction, axial direction, and circumferential direction; the elastic body 310 mainly provides a reset elastic force for the column 306.

[0080] Based on the above implementation, Figure 9 As shown, two top blocks 311 are provided on the long plate 307 for relative rotation. A flat surface is provided on the top block 311 for fitting with the inner wall of the key slot 308. The top block 311 and the long plate 307 are connected by a spring piece 312.

[0081] If only the side of the long plate 307 is in contact with the inner wall of the key groove 308, then since the contact is generally in line contact mode, the pressure will be more concentrated, which will cause damage to the long plate 307 and the rotating shaft 100. Therefore, it is necessary to adjust its contact mode to surface contact, that is, with the help of the top block 311, the surface contact mode of the long plate 307 and the key groove 308 is realized, and since the top block 311 can be rotated on the long plate 307, the long plate 307 and the key groove 308 at any rotation angle can be in surface contact, and the spring piece 312 can be used to provide a reset elastic force for the top block 311; in order to simplify the connection method of the spring piece 312 and the top block 311, a groove 313 can be set on the top block 311, so that the end of the spring piece 312 can be stuck in the groove 313.

[0082] A method for measuring the moment of inertia of a high-speed rotating shaft body, using the above-mentioned high-speed rotating shaft body moment of inertia measuring device, comprises the following steps:

[0083] The rotating shaft body 100 is fixed in position and allowed to rotate freely about its own axis;

[0084] The driving part 200 is connected to the rotating shaft 100 by the transmission part 300;

[0085] In the initial state, the movable plate 203 is located at one side of the outer cylinder 201, the first oil cylinder 204 is in a contracted state, and the first oil cylinder 204 is connected to the movable plate 203, and the second oil cylinder 205 is in an extended state;

[0086] Provide equal and constant hydraulic pressure to the first oil cylinder 204 and the second oil cylinder 205, the first oil cylinder 204 provides a constant thrust to the movable plate 203, and the movable plate 203 moves laterally;

[0087] The threaded connection between the movable plate 203 and the outer cylinder 201 causes the outer cylinder 201 to rotate, and the outer cylinder 201 drives the rotating shaft 100 to rotate through the transmission part 300;

[0088] When the movable plate 203 moves to the midpoint between the first oil cylinder 204 and the second oil cylinder 205, the moving distance data of the movable plate 203 and the rotation speed data of the rotating shaft 100 are recorded, and the moment of inertia of the rotating shaft 100 is calculated using the recorded data, the pitch of the movable plate 203, and the hydraulic pressure value of the first oil cylinder 204;

[0089] At the midpoint, the movable plate 203 separates from the first oil cylinder 204, and the movable plate 203 continues to move and squeeze the second oil cylinder 205 due to the rotational inertia of the rotating shaft 100, causing the second oil cylinder 205 to shrink.

[0090] The moving distance of the movable disk 203 when the rotating shaft 100 stops rotating is recorded, and the moment of inertia of the rotating shaft 100 is calculated again according to the maximum rotation speed of the rotating shaft 100, the moving distance of the movable disk 203, the pitch of the movable disk 203, and the hydraulic pressure value of the second oil cylinder 205 to calibrate the moment of inertia value.

[0091] Using the above method, the active drive detection mode and the rapid detection mode of the rotating shaft body 100 can be realized, which greatly improves the detection efficiency and shortens the detection cycle. In addition, by using the data detection during the acceleration and deceleration of the rotating shaft body 100, two measurements of the moment of inertia of the rotating shaft body 100 in the two movement processes can be realized, thereby facilitating the verification of the moment of inertia.

[0092] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. High-speed rotating shaft moment of inertia measuring device, characterized in that: It includes a tachometer for measuring the rotation speed of the rotating shaft, a driving unit for providing power for the rotation of the rotating shaft, and a transmission unit for transmitting the power output by the driving unit to the rotating shaft; The driving part includes an outer cylinder and a fixed frame passing through the outer cylinder, a movable disk is slidably provided on the fixed frame, the movable disk is located inside the outer cylinder, and the movable disk is screwed to the outer cylinder, and one end of the fixed frame is provided with a first oil cylinder for providing power for the movement of the movable disk, and when the movable disk moves, the outer cylinder rotates, and the outer cylinder transmits power to the rotating shaft through the transmission part; A second oil cylinder is provided at the other end of the fixing frame. When one of the first oil cylinder and the second oil cylinder pushes the movable plate to move to a specified position and separates from each other, the movable plate squeezes the other of the first oil cylinder and the second oil cylinder due to inertia. A spiral groove 1 is provided on the inner wall of the outer cylinder, a plurality of bases are provided on the outer wall of the movable plate, a plurality of rolling bodies are rotatably provided on the bases, and the rolling bodies cooperate with the spiral groove 1; The fixing frame is provided with a plurality of slots, and the inner side walls of the slots are provided with two guide slots opposite to each other, the two guide slots corresponding to the first oil cylinder and the second oil cylinder respectively; The guide groove includes a line groove and an oblique groove, and the two oblique grooves are located between the two line grooves; The transmission part includes a turntable and a transmission shaft. The turntable is provided with a clamping structure for clamping the rotating shaft body. Both ends of the transmission shaft are provided with transmission wheels, and the two transmission wheels are respectively connected to the outer cylinder and the turntable. The clamping structure includes a plurality of pressing units distributed circumferentially on the turntable, and each of the pressing units moves synchronously along the radial direction of the turntable; The pressing unit includes a moving body slidably arranged on the end surface of the turntable and a column arranged 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 conjunction with a key groove on the rotating shaft body.

2. The high-speed rotating shaft moment of inertia measuring device according to claim 1, characterized in that: A quick-install structure is provided between the movable plate and the output end of the first oil cylinder, and between the movable plate and the output end of the second oil cylinder.

3. The high-speed rotating shaft moment of inertia measuring device according to claim 2, characterized in that: The quick-install structure includes a slot plate arranged on the output end of the first oil cylinder or the output end of the second oil cylinder, a card block arranged on the end surface of the movable disk and used in conjunction with the slot plate, and a plurality of slots opened on the side wall of the card block. A plurality of inserts are slidably inserted into the slot plate, and the inserts are used in conjunction with the slots.

4. The high-speed rotating shaft moment of inertia measuring device according to claim 3, characterized in that: A sliding post is slidably arranged in the guide groove, and the sliding post is connected to the inserting body.

5. The high-speed rotating shaft moment of inertia measuring device according to claim 1, characterized in that: The column passes through the moving body and moves relative to it. A second spiral groove is provided on the outer wall of the column. The moving body is provided with a rib used in conjunction with the second spiral groove. The column and the moving body are connected by an elastic body.

6. The high-speed rotating shaft moment of inertia measuring device according to claim 5, characterized in that: Two top blocks are arranged on the long plate for relative rotation. A plane is arranged on the top block, and the plane is used to fit with the inner wall of the keyway. The top block and the long plate are connected by a spring.

7. A method for measuring the moment of inertia of a high-speed rotating shaft, using the high-speed rotating shaft moment of inertia measuring device according to any one of claims 1 to 6, characterized in that: The steps include: The position of the rotating shaft is fixed and the rotating shaft is allowed to rotate freely about its own axis; The driving part is connected to the rotating shaft by the transmission part; In the initial state, the movable plate is located at one side of the outer cylinder, the first oil cylinder is in a contracted state and connected to the movable plate, and the second oil cylinder is in an extended state; providing equal and constant hydraulic pressure to the first oil cylinder and the second oil cylinder, wherein the first oil cylinder provides a constant thrust to the movable plate, and the movable plate moves laterally; The threaded connection between the movable disk and the outer cylinder causes the outer cylinder to rotate, and the outer cylinder drives the rotary shaft to rotate through the transmission part; When the movable plate moves to the midpoint between the first oil cylinder and the second oil cylinder, the movable plate movement distance data and the rotation speed data of the rotary shaft are recorded, and the rotational inertia of the rotary shaft is calculated using the recorded data, the movable plate pitch, and the hydraulic pressure value of the first oil cylinder; At the midpoint, the movable plate is separated from the first oil cylinder, and the movable plate continues to move and squeeze the second oil cylinder due to the rotational inertia of the rotating shaft, causing the second oil cylinder to contract; The moving distance of the movable disk when the rotating shaft stops rotating is recorded, and the rotational inertia of the rotating shaft is calculated again according to the maximum rotation speed of the rotating shaft, the moving distance of the movable disk, the pitch of the movable disk, and the hydraulic pressure value of the second cylinder to calibrate the rotational inertia value.

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