Composite material ring pre-tightening force detection device and detection method for energy storage flywheel

Abstract

The application discloses a composite material ring pre-tightening force detection device and method for an energy storage flywheel, the composite material ring pre-tightening force detection device comprises a shell, a rotating shaft, a driving part, an assembled ring and a rotating speed sensor, the rotating shaft is vertically arranged in the shell, the rotating shaft comprises a rotating shaft disc and connecting shafts connected to two sides of the rotating shaft disc, the two connecting shafts are rotatably connected to a top plate and a bottom plate of the shell respectively, the driving part is arranged outside the shell and connected to the rotating shaft, the driving part is used for driving the rotating shaft to rotate, the assembled ring is annularly arranged at an outer periphery of the rotating shaft disc and is in interference fit with the rotating shaft disc, an outer periphery surface of the assembled ring is suitable for interference fit with a composite material ring to be tested, and the rotating speed sensor is arranged in the shell and is used for detecting the rotating speed of the rotating shaft. The composite material ring pre-tightening force detection device for the energy storage flywheel can accurately detect the pre-tightening force of the assembled composite material ring, meets the pre-design requirement of the energy storage flywheel, and can verify the strength of the composite material flywheel in advance.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of energy storage, and particularly relates to a composite material ring pre-tightening force detection device and method for an energy storage flywheel. BACKGROUND

[0002] A flywheel energy storage system is an electromechanical energy conversion energy storage device that breaks through the limitations of chemical batteries and realizes energy storage by physical methods. When storing energy, electric energy is converted by an electric power converter to drive a motor to operate, and the motor drives the flywheel to accelerate rotation, and the flywheel stores energy in the form of kinetic energy. The energy storage density of the energy storage flywheel is related to its rotational speed and volume. The faster the rotational speed and the larger the volume, the higher the energy storage density. Therefore, increasing the linear speed and volume of the flywheel rotor is the key to improving the energy storage density of the energy storage flywheel.

[0003] However, because the strength of the metal material itself limits the range of the maximum speed, the composite material with relatively high strength is used as part of the energy storage structure to coat the outer periphery of the flywheel rotor in the related technology. However, the cooperation between the composite material and the flywheel rotor needs to ensure that the flywheel rotor does not separate from the composite material when rotating at high speed, that is, the composite material cannot fall off at high speed. To ensure the adhesion of the composite material and the flywheel rotor at high speed, a suitable pre-tightening force needs to be set for the assembly of the composite material to ensure that the pre-tightening force can ensure the close fit between the composite material and the flywheel rotor at the maximum allowable linear speed. However, because of the characteristics of the composite material, the pre-tightening force calculated by simulation in the related technology is inaccurate, and the energy storage flywheel cannot be designed based on the derived pre-tightening force. In addition, obtaining a suitable pre-tightening force through repetitive tests also has the problem of a large amount of waste and may cause damage to the flywheel rotor. SUMMARY

[0004] The present application aims to at least solve one of the technical problems in the related art. To this end, an embodiment of the present application provides a composite ring pre-tightening force detection device for an energy storage flywheel, which can simulate the actual operating environment of a flywheel rotor, and the pre-tightening force detection device comprises an assembly ring, a composite ring, and a rotating shaft for simulating a flywheel body, the assembly ring is fitted on the rotating shaft disc of the rotating shaft in an interference fit, and the composite ring can be fitted on the outer periphery of the assembly ring in an interference fit. Thus, the rotating speed v1 of the rotating shaft when the assembly ring is separated can be measured without assembling the composite ring by using the pre-tightening force detection device of the present application, and the rotating speed of the simulated rotor when the simulated assembly ring is separated is corrected by v1, and the rotating speed v2 of the rotating shaft when the composite ring is separated is measured under the condition of assembling the composite ring, and v2 is taken as the target value of the rotating speed of the simulated rotor, when the rotating speed of the simulated rotor when the simulated assembly ring is separated is equal to v2, the simulated pre-tightening force at this time is equivalent to the actual pre-tightening force, that is, the pre-tightening force detection device of the present application can detect the actual rotating speed of the flywheel rotor when the assembly ring is separated, so as to correct the simulation parameters and obtain accurate pre-tightening force, which meets the pre-design requirements of the energy storage flywheel, and the strength of the composite flywheel can be verified in advance to ensure the safety of the flywheel rotor during actual operation.

[0005] An embodiment of the present application also provides a detection method of a composite ring detection device for an energy storage flywheel.

[0006] The composite ring pre-tightening force detection device for an energy storage flywheel of the embodiment of the present application comprises a housing, a rotating shaft and a driving member, the rotating shaft is vertically arranged in the housing, the rotating shaft comprises a rotating shaft disc and two connecting shafts connected to both sides of the rotating shaft disc, the two connecting shafts are rotatably connected to the top plate and the bottom plate of the housing respectively, the driving member is arranged outside the housing and connected to the rotating shaft, and the driving member is used to drive the rotating shaft to rotate; an assembly ring is arranged around the outer periphery of the rotating shaft disc and is in interference fit with the rotating shaft disc, and the outer peripheral surface of the assembly ring is suitable for interference fit with the composite ring to be tested; a rotating speed sensor is arranged in the housing, and the rotating speed sensor is used to detect the rotating speed of the rotating shaft.

[0007] The composite ring pre-tightening force detection device of the energy storage flywheel of the embodiment of the application comprises a rotating shaft, a driving member, an assembly ring and a rotating speed sensor, the assembly ring is in interference fit on the outer periphery of the rotating shaft disc of the rotating shaft, the outer side of the assembly ring can be interference fitted with the composite ring to be tested, the driving member can drive the rotating shaft to simulate the rotation of the flywheel rotor, and the rotating speed sensor can detect the rotating speed information of the rotating shaft, whereby, by using the pre-tightening force detection device of the application, the rotating speed v1 of the rotating shaft when the assembly ring is separated can be measured without assembling the composite ring, and the rotating speed of the simulated rotor when the assembly ring is separated is corrected by v1, and the rotating speed v2 of the rotating shaft 2 when the composite ring is separated under the condition of assembling the composite ring is measured, and v2 is taken as the target value of the rotating speed of the simulated rotor, when the rotating speed of the simulated rotor when the assembly ring is separated is equal to v2, the simulated pre-tightening force at this time is equivalent to the actual pre-tightening force, that is, by using the pre-tightening force detection device of the application, the real rotating speed of the flywheel rotor when the assembly ring is separated can be detected, so that the simulation parameters are corrected, the accurate pre-tightening force is obtained, the pre-design requirement of the energy storage flywheel is met, and the strength of the composite flywheel can be verified in advance, so that the safety of the flywheel rotor in actual operation is ensured.

[0008] In some embodiments, the composite ring pre-tightening force detection device of the energy storage flywheel further comprises a displacement sensor, which can detect the position of the assembly ring.

[0009] In some embodiments, the assembly ring comprises a body, the body is arranged on the outer periphery of the rotating shaft disc, and the upper end of the body is provided with a limiting flange facing the central axis of the rotating shaft, and the limiting flange is adapted to abut against the upper end surface of the rotating shaft disc when the assembly ring is separated from the rotating shaft disc.

[0010] In some embodiments, the inner side surface of the connection between the body and the limiting flange has an annular groove.

[0011] The detection method of the composite ring pre-tightening force detection device of the energy storage flywheel of the embodiment of the application, the composite ring pre-tightening force detection device of the energy storage flywheel is the composite ring pre-tightening force detection device of the energy storage flywheel described in the above embodiments, and the detection method comprises the following steps: testing the rotating speed of the rotating shaft when the assembly ring is separated without setting the composite ring, and recording the rotating speed as v1; testing the rotating speed of the rotating shaft when the assembly ring is separated on the basis of setting the composite ring, and recording the rotating speed as v2; inputting v1 and v2 into simulation software, and calculating the assembly pre-tightening force of the composite ring by using the simulation software.

[0012] The detection method of the composite ring pre-tightening force detection device of the energy storage flywheel of the embodiment of the application, by actually measuring the rotating speed of the rotating shaft when the assembly ring is separated, the simulation parameters are corrected, the assembly pre-tightening force of the composite material is calculated by using the corrected simulation parameters, and the pre-design requirement of the energy storage flywheel is realized.

[0013] In some embodiments, the testing the rotating speed of the rotating shaft when the assembly ring falls off without the composite material ring includes: judging whether the assembly ring falls off by using the displacement sensor; and obtaining the rotating speed v1 of the rotating shaft when the assembly ring falls off by using the rotating speed sensor.

[0014] In some embodiments, the testing the rotating speed of the rotating shaft when the assembly ring falls off with the composite material ring includes: judging whether the assembly ring with the composite material ring falls off by using the displacement sensor; and obtaining the rotating speed v2 of the rotating shaft when the assembly ring falls off by using the rotating speed sensor.

[0015] In some embodiments, the inputting v1 and v2 into the simulation software and calculating the assembly pre-tightening force of the composite material ring by using the simulation software includes: correcting the rotating speed of the simulation rotating shaft when the simulation assembly ring falls off by using the tested v1.

[0016] In some embodiments, the inputting v1 and v2 into the simulation software and calculating the assembly pre-tightening force of the composite material ring by using the simulation software further includes: applying a pre-tightening pressure on the outside of the simulation assembly ring, adjusting the pre-tightening pressure until the rotating speed of the simulation rotating shaft when the simulation assembly ring falls off is v2, outputting the pre-tightening pressure at this time and calculating the pre-tightening force according to the pre-tightening pressure. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a structural schematic diagram of a composite material ring pre-tightening force detection device of an energy storage flywheel according to an embodiment of the present application.

[0018] Figure 2 FIG. 2 is a partial assembly view of the composite material ring pre-tightening force detection device of the energy storage flywheel according to the embodiment of the present application.

[0019] Figure 3 FIG. 3 is a schematic diagram of a simulation assembly ring and a simulation rotating shaft, in which a simulation pre-tightening pressure is shown.

[0020] Figure 4 FIG. 4 is a detection principle flowchart of the composite material ring pre-tightening force detection device of the energy storage flywheel according to the embodiment of the present application.

[0021] REFERENCE SIGNS:

[0022] Housing 1, cover body 11, bottom plate 12, sealing ring 13, bearing 14, rotating shaft 2, rotating shaft disc 21, connecting shaft 22, assembly ring 3, limiting flange 31, composite material ring 4, displacement sensor 5, simulation rotating shaft 6, simulation assembly ring 7. DETAILED DESCRIPTION

[0023] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0024] As shown in Figure 1 The composite ring pre-tightening force detection device of the energy storage flywheel of the embodiment of the application comprises a shell 1, a rotating shaft 2, a driving member, an assembled ring 3 and a rotating speed sensor.

[0025] As shown in Figure 1 The rotating shaft 2 is vertically arranged in the shell 1, the rotating shaft 2 comprises a rotating shaft disc 21 and connecting shafts 22 connected to both sides of the rotating shaft disc 21, the two connecting shafts 22 are rotatably connected to the top plate and the bottom plate 12 of the shell 1 respectively, the driving member is arranged outside the shell 1 and connected to the rotating shaft 2, the driving member is used to drive the rotating shaft 2 to rotate, the assembled ring 3 is annularly arranged outside the rotating shaft disc 21 and is in interference fit with the rotating shaft disc 21, and the outer circumferential surface of the assembled ring 3 is suitable for interference fit with the composite material ring 4 to be tested, and the rotating speed sensor is arranged in the shell 1 and is used to detect the rotating speed of the rotating shaft 2.

[0026] As shown in Figure 1 The connecting shaft 22 is provided with a bearing 14 at the connection with the shell 1 for supporting the rotating shaft 2 to rotate, one end of the connecting shaft 22 connected to the top plate of the shell 1 extends out of the shell 1 and is connected to the driving member, and a sealing ring 13 is arranged between the connecting shaft 22 and the shell 1 to maintain the sealing property of the shell 1.

[0027] In order to facilitate understanding of how the detection device of the present application calculates the pre-tightening force, the detailed operation process of the pre-tightening force is described here: the assembled ring 3 is first interference fitted with the rotating shaft disc 21, and the composite material ring 4 is not arranged, then the driving member is used to drive the rotating shaft 2 to rotate until the assembled ring 3 is separated from the rotating shaft disc 21, the rotating speed of the rotating shaft 2 at this time is detected by the rotating speed sensor and recorded as v1, then the composite material ring 4 is assembled outside the assembled ring 3, and the above process is repeated, the rotating speed of the rotating shaft 2 at this time when the assembled ring 3 is separated from the rotating shaft disc 21 is detected by the rotating speed sensor and recorded as v2, it can be understood that the reason for the difference between the two rotating speeds is that the composite material ring 4 applies a pre-tightening force to the assembled ring 3, then the v1 is used to correct the rotating speed of the simulation rotating shaft 6 when the simulation assembled ring 7 falls off, then a gradually increasing simulation pre-tightening pressure is applied until the rotating speed of the simulation rotating shaft 6 when the simulation assembled ring 7 falls off is the same as v2, then the pre-tightening force of the simulation pre-tightening pressure acting on the simulation assembled ring 7 is the same as the pre-tightening force of the actual composite material ring 4 acting on the assembled ring 3, thus, the pre-tightening force of the composite material ring 4 can be indirectly obtained.

[0028] In addition, the detection device of the present application can also simulate the actual operating environment of the flywheel rotor to verify whether the strength of the composite material flywheel meets the standard before the flywheel is tested in reality, to ensure the safety of the composite material flywheel and avoid damage to the flywheel rotor in actual operation.

[0029] The composite ring 4 pre-tightening force detection device of the embodiment of the application comprises a rotating shaft 2, a driving member, an assembly ring 3 and a rotating speed sensor. The assembly ring 3 is in interference fit on the outer periphery of the rotating shaft disc 21 of the rotating shaft 2, and the outer side of the assembly ring 3 can be interference fitted with the composite ring 4 to be tested. The driving member can drive the rotating shaft 2 to simulate the rotation of the flywheel rotor. The rotating speed sensor can detect the rotating speed information of the rotating shaft 2. Thus, the pre-tightening force detection device of the application can measure the rotating speed v1 of the rotating shaft 2 when the assembly ring 3 is separated without assembling the composite ring 4, and correct the simulated rotating speed of the simulated rotor when the simulated assembly ring 7 is separated by v1. The rotating speed v2 of the rotating shaft 2 is measured when the assembly ring 3 is separated under the condition of assembling the composite ring 4, and v2 is used as the target value of the rotating speed of the simulated rotor. When the rotating speed of the simulated rotor when the simulated assembly ring 7 is separated is equal to v2, the simulated pre-tightening force at this time is equivalent to the actual pre-tightening force. That is, the pre-tightening force detection device of the application can detect the actual rotating speed of the flywheel rotor when the assembly ring 3 is separated, so as to correct the simulation parameters and obtain the accurate pre-tightening force, which meets the pre-design requirements of the energy storage flywheel. At the same time, the strength of the composite flywheel can be verified in advance, so as to ensure the safety of the flywheel rotor in actual operation.

[0030] Further, as shown in Figure 1 , the detection device further comprises a displacement sensor 5, which can detect the position of the assembly ring. It can be understood that the assembly ring 3 will move downward under the action of gravity when the assembly ring 3 is separated from the rotating shaft 2. Thus, when the displacement sensor 5 detects that the position of the assembly ring 3 changes, it can be determined that the assembly ring 3 is separated from the rotating shaft 2, so as to enable the rotating speed sensor to accurately record the rotating speed of the rotating shaft 2 when the assembly ring 3 is separated.

[0031] Preferably, as shown in Figure 1 , the displacement sensor 5 is arranged on the bottom plate 12 of the housing 1 and opposite to the lower end surface of the assembly ring 3.

[0032] Optionally, as shown in Figure 1 , the displacement sensor 5 is a plurality of displacement sensors.

[0033] Optionally, as shown in Figure 1 , the housing 1 is a vacuum sealed housing 1, and the housing 1 comprises a cover 11 and a bottom plate 12. The cover 11 is detachably connected to the bottom plate 12.

[0034] Preferably, as shown in Figure 1 , the assembly ring 3 comprises a body. The body is arranged around the outer periphery of the rotating shaft disc 21. The upper end of the body has a limiting flange 31 arranged towards the central axis of the rotating shaft 2. When the assembly ring 3 is separated from the rotating shaft disc 21, the limiting flange 31 is adapted to abut against the upper end surface of the rotating shaft disc 21. Thus, when the assembly ring 3 is separated from the rotating shaft disc 21, the assembly ring 3 will not fall off from the rotating shaft disc 21 under the action of the limiting flange 31, so as to avoid damage to the composite ring 4 caused by reassembly or falling.

[0035] Optionally, as shown in Figure 1 The limiting flange 31 is an annular flange extending along the circumference of the body.

[0036] Preferably, the inner side of the body at the connection with the limiting flange 31 has an annular groove.

[0037] For the sake of understanding, the following Figures 2-4 The detection method of the composite ring pre-tightening force detection device of the energy storage flywheel is described in detail.

[0038] The detection method of the composite ring pre-tightening force detection device of the energy storage flywheel based on the above embodiment is a detection method including testing the rotational speed of the rotating shaft 2 when the assembly ring 3 falls off without setting the composite material ring 4, and recording the rotational speed as v1, then testing the rotational speed of the rotating shaft 2 when the assembly ring 3 falls off on the basis of setting the composite material ring 4, and recording the rotational speed as v2, and then inputting v1 and v2 into the simulation software, and calculating the assembly pre-tightening force of the composite material ring 4 by using the simulation software.

[0039] The detection method of the composite ring pre-tightening force detection device of the energy storage flywheel of the embodiment of the application, by actually measuring the rotational speed of the rotating shaft 2 when the assembly ring 3 separates, corrects the simulation parameters, and calculates the assembly pre-tightening force of the composite material by using the corrected simulation parameters, to achieve the pre-design requirements of the energy storage flywheel.

[0040] Specifically, testing the rotational speed of the rotating shaft 2 when the assembly ring 3 falls off without setting the composite material ring 4 includes: using the displacement sensor 5 to determine whether the assembly ring 3 falls off, and obtaining the rotational speed v1 of the rotating shaft 2 by the rotational speed sensor when the assembly ring 3 falls off.

[0041] Further, testing the rotational speed of the rotating shaft 2 when the assembly ring 3 falls off on the basis of setting the composite material ring 4 includes: using the displacement sensor 5 to determine whether the assembly ring 3 falls off with the composite material ring 4 outside, and obtaining the rotational speed v2 of the rotating shaft 2 by the rotational speed sensor when the assembly ring 3 falls off.

[0042] It can be understood that the detection principle of the rotational speed of the rotating shaft 2 when the assembly ring 3 falls off in the two cases is consistent, and the difference is only that v1 is measured without assembling the composite material ring 4, and v2 is measured with the composite material ring 4, so as to keep the uniqueness of the variable and ensure the accuracy of the simulation correction.

[0043] Further, inputting v1 and v2 into the simulation software, and calculating the assembly pre-tightening force of the composite material ring 4 by using the simulation software includes: correcting the rotational speed of the simulation rotating shaft 6 when the simulation assembly ring 7 falls off by using the tested v1, and then applying a pre-tightening pressure outside the simulation assembly ring 7 (for reference Figure 3), the pre-tightening pressure is adjusted until the rotating speed of the simulation rotating shaft 6 is v2 when the simulation assembling ring 7 falls off, and the pre-tightening pressure at this time is outputted, and the pre-tightening force is calculated according to the pre-tightening pressure.

[0044] It can be understood that the pre-tightening pressure is consistent with the pre-tightening effect of the pre-tightening force of the composite material ring 4 on the assembling ring 3 when the rotating speed of the simulation rotating shaft 6 is v2, so that the pre-tightening force can be indirectly obtained according to the pre-tightening pressure.

[0045] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0046] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0047] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication or interaction relationship of two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] In the present application, unless otherwise specifically defined and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0049] In this disclosure, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the present disclosure. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily referred to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, the terms "comprising", "containing", "having" and "including" and their derivatives, are not intended to exclude other features, structures, materials, or characteristics not expressly mentioned. The terms "comprising", "containing", "having" and "including" and their derivatives are intended to be equivalent to the terms "consisting of" and "consisting essentially of" and their derivatives.

[0050] Although the above-mentioned embodiments have been shown and described, it is understood that the above-mentioned embodiments are exemplary, and cannot be understood as limiting the present disclosure, and the changes, modifications, replacements and variations of the above-mentioned embodiments made by those skilled in the art are within the protection scope of the present disclosure.

Claims

1. A composite material ring pre-tightening force detection device of an energy storage flywheel, characterized in that, The device comprises: a housing; a rotating shaft vertically arranged in the housing, the rotating shaft comprising a rotating shaft disc and two connecting shafts connected to both sides of the rotating shaft disc, the two connecting shafts being rotatably connected to the top plate and the bottom plate of the housing respectively, and a driving member arranged outside the housing and connected to the rotating shaft, the driving member being used to drive the rotating shaft to rotate; an assembly ring, the assembly ring being annularly arranged at the outer periphery of the rotating shaft disc and being in interference fit with the rotating shaft disc, and the outer peripheral surface of the assembly ring being suitable for interference fit with a composite ring to be tested; a rotating speed sensor arranged in the housing, the rotating speed sensor being used to detect the rotating speed of the rotating shaft.

2. The composite ring pre-tension detection device of an energy storage flywheel according to claim 1, characterized in that, Further comprising a displacement sensor, the displacement sensor being used to detect the position of the assembly ring.

3. The composite ring pre-tension detection device of an energy storage flywheel according to claim 1, characterized in that, The assembly ring comprises a body, the body being annularly arranged at the outer periphery of the rotating shaft disc, and the upper end of the body having a limiting flange arranged towards the central axis of the rotating shaft, the limiting flange being suitable for abutting against the upper end surface of the rotating shaft disc when the assembly ring is separated from the rotating shaft disc.

4. The composite ring pre-tension detection device of an energy storage flywheel according to claim 3, characterized in that, The inner side surface of the connection between the body and the limiting flange has an annular groove.

5. A detection method of a composite material ring pre-tightening force detection device of an energy storage flywheel, characterized in that, The composite ring pre-tightening force detection device of the energy storage flywheel according to any one of claims 1-4, the detection method comprising: testing the rotating speed of the rotating shaft when the assembly ring falls off without arranging the composite ring, and recording the rotating speed as v1; testing the rotating speed of the rotating shaft when the assembly ring falls off with the composite ring arranged, and recording the rotating speed as v2; inputting v1 and v2 into simulation software, and calculating the assembly pre-tightening force of the composite ring by using the simulation software.

6. The detection method of the composite material ring preload detection device for energy storage flywheels according to claim 5, characterized in that, The testing of the rotating speed of the rotating shaft when the assembly ring falls off without arranging the composite ring comprises: judging whether the assembly ring falls off by using the displacement sensor; when the assembly ring falls off, obtaining the rotating speed v1 of the rotating shaft by using the rotating speed sensor.

7. The method of claim 5, wherein the method further comprises: determining the pre-tightening force of the composite ring of the energy storage flywheel by measuring the voltage of the piezoelectric sensor. The testing of the rotating speed of the rotating shaft when the assembly ring falls off with the composite ring arranged comprises: judging whether the assembly ring with the composite ring arranged falls off by using the displacement sensor; when the assembly ring falls off, obtaining the rotating speed v2 of the rotating shaft by using the rotating speed sensor.

8. The method of claim 5, wherein the method further comprises: determining the pre-tightening force of the composite ring of the energy storage flywheel by measuring the voltage of the piezoelectric sensor. The inputting of v1 and v2 into simulation software, and the calculation of the assembly pre-tightening force of the composite ring by using the simulation software comprise: correcting the rotating speed of the simulation rotating shaft when the simulation assembly ring falls off by using the tested v1.

9. The detection method of the composite material ring preload detection device for energy storage flywheels according to claim 8, characterized in that, The inputting of v1 and v2 into simulation software, and the calculation of the assembly pre-tightening force of the composite ring by using the simulation software further comprise: applying a pre-tightening pressure outside the simulation assembly ring, adjusting the pre-tightening pressure until the rotating speed of the simulation rotating shaft when the simulation assembly ring falls off is v2, outputting the pre-tightening pressure at this time and calculating the pre-tightening force according to the pre-tightening pressure.

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