Strain gauge and strain detection method for radial vibration and torque detection

Abstract

This application relates to the field of strain measurement and discloses a strain gauge for detecting radial vibration and torque, comprising: a first substrate on which a first strain gauge is encapsulated by a film; a second substrate on which a second strain gauge is encapsulated by a film; a third substrate on which a third strain gauge is encapsulated by a film, a connecting portion on one side of the third substrate, and a corner of the first and second substrates adjacent to each other connected to the connecting portion; the first, second, and third strain gauges all measure strain using a Wheatstone bridge; and a support body including a first support end, a second support end, and a fixed plate, wherein the first support end is used to cooperate with a rotating shaft, the fixed plate is connected between the first and second support ends, the first and second substrates can be bent at the connecting portion and then attached to the fixed plate respectively, and the third substrate can be attached to the rotating shaft. This application can simultaneously detect radial vibration and torque.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of strain detection, and more particularly to a strain gauge and a strain detection method for radial vibration and torque detection. BACKGROUND

[0002] The strain of a mechanical component is a very important engineering parameter, so accurate measurement of the strain of a mechanical component is of great significance. A strain gauge (also known as a strain sensor) is a measuring tool used to measure the strain of a mechanical component caused by force. A resistance strain gauge is the most commonly used strain gauge. A conventional strain gauge is made by attaching a sensitive grid made of thin metal foil to a substrate made of plastic film, and then covering it with a layer of film. In some applications of mechanical components, it is necessary to monitor the torque and vibration of the mechanical components to monitor the motion state of the mechanical components. For example, when a shaft component is used, the radial vibration state and torque of the shaft component need to be monitored to monitor the working state of the shaft component. When monitoring the radial vibration and torque of the shaft component, the radial strain and strain caused by the torque can also be monitored by a strain gauge to monitor the radial vibration and torque of the shaft component.

[0003] Existing strain gauges cannot simultaneously monitor the radial vibration and torque of a shaft component. For example, patent CN216524470U (application number: CN202123072334.4) provides a strain gauge integrated with a torque ring sensor, which includes a substrate, a strain gauge one, a strain gauge two, a strain gauge three, and a strain gauge four. The substrate is provided in a circular ring structure, and the substrate is provided with the strain gauge one, the strain gauge two, the strain gauge three, and the strain gauge four at equal intervals. The strain gauge one, the strain gauge two, the strain gauge three, and the strain gauge four are distributed in a circular manner with the center of the substrate as the center, and the strain gauge one, the strain gauge two, the strain gauge three, and the strain gauge four are arranged on the same plane. The strain gauge one, the strain gauge two, the strain gauge three, and the strain gauge four of the strain gauge integrated with the torque ring sensor in patent CN216524470U are fixed on the substrate by the design of integrating a full-bridge circuit, which can detect torque. However, the strain gauge in patent CN216524470U cannot simultaneously detect radial vibration and torque. SUMMARY

[0004] The purpose of the present application is to provide a strain gauge and a strain detection method for radial vibration and torque detection, which solves the technical problem of being unable to simultaneously detect radial vibration and torque, and achieves the technical effect of simultaneously detecting radial vibration and torque.

[0005] The strain gauge for radial vibration and torque detection provided by the embodiment of the application comprises: a first substrate, the first substrate being encapsulated with a first strain gauge through a film; a second substrate, the second substrate being encapsulated with a second strain gauge through a film; a third substrate, the third substrate being encapsulated with a third strain gauge through a film, one side of the third substrate being provided with a connecting part, and one corner of the first substrate and the second substrate close to each other being connected to the connecting part, the first strain gauge, the second strain gauge and the third strain gauge all measuring strain through a Wheatstone bridge; a support body comprising a first support end, a second support end and a fixed plate, the first support end being used for cooperating with a rotating shaft, the second support end being used for supporting the fixed plate, the fixed plate being connected between the first support end and the second support end, the fixed plate being made of a rigid material, the first substrate and the second substrate being capable of being attached to the fixed plate after being bent at the connecting part, and the third substrate being capable of being attached to the rotating shaft, so that the first strain gauge and the second strain gauge can measure radial vibration of the rotating shaft, and the third strain gauge can measure axial strain of the rotating shaft.

[0006] In a possible implementation, the connecting part is provided with a terminal, and the terminal is electrically connected to the first strain gauge, the second strain gauge and the third strain gauge through lines etched on the first substrate, the second substrate and the third substrate.

[0007] In another possible implementation, the number of the support bodies is two, and the end of the first support end and the end of the second support end of each support body are both transversely connected to a side wall of the fixed plate, the fixed plates of the two support bodies are attached to each other, and flexible positioning glue is arranged between the fixed plates of the two support bodies.

[0008] In another possible implementation, the cross section of the first support end is in a curve shape, so that the first support end can cooperate with the outer side wall of the rotating shaft.

[0009] In another possible implementation, the fixed ring and a test assembly are further included, the fixed ring is arranged in the circumferential direction of the rotating shaft, a plurality of strain gauges are arranged between the fixed ring and the rotating shaft, the first support end of the two support bodies of each strain gauge abuts against the rotating shaft, the second support end of the two support bodies of each strain gauge abuts against the fixed ring, the test assembly is fixedly connected to the fixed ring, and the terminal of each strain gauge is connected to the test assembly through a cable.

[0010] In another possible implementation, the fixed ring comprises two detachable ring bodies, and the two detachable ring bodies are connected to the plurality of strain gauges through a buckle sleeve.

[0011] In another possible implementation, a plurality of dampers are arranged on the fixed ring along the circumferential direction of the fixed ring.

[0012] In another possible implementation, the method comprises: attaching the third substrate to the rotating shaft, abuttingly fitting the first supporting end of the supporting body to the outer sidewall of the rotating shaft, attaching the first substrate to the first sidewall of the fixed plate, attaching the second substrate to the second sidewall of the fixed plate, measuring the radial vibration of the rotating shaft by the first and second strain gauges, and measuring the axial strain of the rotating shaft by the third strain gauge.

[0013] The application further provides a strain detection method, which comprises the steps of: attaching the flexible positioning adhesive between the fixed plates of the two supporting bodies, attaching the first substrate to the fixed plate of one supporting body, and attaching the second substrate to the fixed plate of the other supporting body; sleeving the fixed ring around the circumference of the rotating shaft, and arranging a plurality of strain gauges between the fixed ring and the rotating shaft, wherein the first supporting end of the two supporting bodies of each strain gauge abuts against the rotating shaft, and the second supporting end of the two supporting bodies of each strain gauge abuts against the fixed ring; measuring the radial vibration of the rotating shaft by the first and second strain gauges, and measuring the axial strain of the rotating shaft by the third strain gauge.

[0014] In another possible implementation, the method further comprises: fixing the test assembly to the fixed ring, connecting the terminal of each strain gauge to the test assembly through the cable, storing the test data by the test assembly during the rotation of the rotating shaft, and analyzing the data in the test assembly to obtain the test result after the rotation of the rotating shaft is stopped.

[0015] In another possible implementation, the method further comprises: obtaining the radial vibration value of the rotating shaft measured by the first and second strain gauges of the plurality of strain gauges, and obtaining the axial strain value of the rotating shaft measured by the first and second strain gauges of the plurality of strain gauges; when the average of the radial vibration values of the first and second strain gauges of the first strain gauge is greater than the average of the preset radial vibration values, discarding the radial vibration measurement value of the first strain gauge, and determining the average of the radial vibration values of the first and second strain gauges of the strain gauges other than the first strain gauge as the radial vibration measurement value; and determining the average of the axial strain values of the rotating shaft measured by the third strain gauges of the plurality of strain gauges as the axial strain measurement value.

[0016] In another possible implementation, the method further includes: obtaining radial vibration values of the first strain gauge and the second strain gauge of the first strain gage in a first time period, and determining a radial vibration average value of the first strain gauge and the second strain gauge of the first strain gage in the first time period; obtaining an axial strain measurement value of the third strain gauge of the first strain gage in the first time period, and determining an axial strain average value of the third strain gauge of the first strain gage in the first time period; when a ratio of the radial vibration value at the first time and the radial vibration average value is greater than a preset ratio, and a ratio of the axial strain measurement value at the first time and the axial strain average value is greater than a preset ratio, discarding the radial vibration value at the first time and the axial strain measurement value at the first time.

[0017] The application embodiment has the beneficial effects compared with the prior art:

[0018] The application embodiment provides a strain gauge for radial vibration and torque detection, including: a first substrate, a first strain gauge is packaged on the first substrate by a film coating; a second substrate, a second strain gauge is packaged on the second substrate by a film coating; a third substrate, a third strain gauge is packaged on the third substrate by a film coating, a connecting part is arranged on one side of the third substrate, a corner part of the first substrate and the second substrate close to each other is connected to the connecting part, the first strain gauge, the second strain gauge and the third strain gauge all measure strain through a Wheatstone bridge; a support body, including a first support end, a second support end and a fixed plate, the first support end is used for cooperating with a rotating shaft, the second support end is used for supporting the fixed plate, the fixed plate is connected between the first support end and the second support end, the fixed plate is made of a rigid material, the first substrate and the second substrate can be respectively attached to the fixed plate after being bent at the connecting part, the third substrate can be attached to the rotating shaft, so that the first strain gauge and the second strain gauge can measure radial vibration of the rotating shaft, and the third strain gauge can measure axial strain of the rotating shaft. The strain gauge for radial vibration and torque detection in the application embodiment transmits the vibration state of the rotating shaft through the fixed plate, can detect radial vibration through the first strain gauge and the second strain gauge on the fixed plate, and can measure torque of the rotating shaft through the third strain gauge, the first substrate and the second substrate are bent to the fixed plate through the connecting part, one-time fixing of the strain gauge is facilitated, and the convenience of measuring radial vibration and torque of the rotating shaft is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the application embodiments, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0020] Figure 1A structure schematic view of a strain gauge for radial vibration and torque detection provided by an embodiment of the present application;

[0021] Figure 2 A front structure schematic view of a strain gauge for radial vibration and torque detection provided by an embodiment of the present application in use state;

[0022] Figure 3 A structure schematic view of a strain gauge for radial vibration and torque detection provided by an embodiment of the present application; Figure 2 A structure schematic view of a strain gauge for radial vibration and torque detection provided by an embodiment of the present application;

[0023] Figure 4 A left structure schematic view of a strain gauge for radial vibration and torque detection provided by an embodiment of the present application in use state;

[0024] Figure 5 A structure schematic view of a strain gauge for radial vibration and torque detection provided by an embodiment of the present application; Figure 4 A structure schematic view of a strain gauge for radial vibration and torque detection provided by an embodiment of the present application;

[0025] Figure 6 A flow schematic view of a strain detection method provided by an embodiment of the present application;

[0026] In the figure, 11, first substrate; 111, first strain gauge; 12, second substrate; 121, second strain gauge; 13, third substrate; 131, third strain gauge; 14, connecting part; 141, terminal; 2, support body; 21, first support end; 22, second support end; 23, fixed plate; 24, positioning glue; 3, rotating shaft; 4, fixed ring; 41, damper; 5, test assembly. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0028] It should be noted that when a component or structure is referred to as "fixed to" or "disposed on" another component or structure, it can be directly on the other component or structure or indirectly on the other component or structure. When a component or structure is referred to as "connected to" another component or structure, it can be directly connected to the other component or structure or indirectly connected to the other component or structure.

[0029] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate directions or positions based on the directions or positions shown in the drawings, and are used only for the purpose of facilitating this application and simplifying the description, and do not indicate or imply that the device or a component or structure referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0030] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0031] The existing strain gauge cannot detect radial vibration and torque at the same time.

[0032] For the above reasons, the embodiments of the present application provide a strain gauge for radial vibration and torque detection, comprising: a first substrate, a first strain gauge encapsulated on the first substrate by a film coating; a second substrate, a second strain gauge encapsulated on the second substrate by a film coating; a third substrate, a third strain gauge encapsulated on the third substrate by a film coating, a connecting portion provided on one side of the third substrate, and a corner portion of the first substrate and the second substrate close to each other connected to the connecting portion, the first strain gauge, the second strain gauge and the third strain gauge all measuring strain through a Wheatstone bridge; a support body comprising a first support end, a second support end and a fixed plate, the first support end being used to cooperate with a rotating shaft, the second support end being used to support the fixed plate, the fixed plate being connected between the first support end and the second support end, the fixed plate being made of rigid material, the first substrate and the second substrate being able to be attached to the fixed plate after being bent at the connecting portion, and the third substrate being able to be attached to the rotating shaft, so that the first strain gauge and the second strain gauge can measure the radial vibration of the rotating shaft, and the third strain gauge can measure the axial strain of the rotating shaft. The strain gauge for radial vibration and torque detection in the embodiments of the present application transmits the vibration state of the rotating shaft through the fixed plate, and can detect the radial vibration through the first strain gauge and the second strain gauge on the fixed plate, and measure the torque of the rotating shaft through the third strain gauge. The connecting portion facilitates the bending of the first substrate and the second substrate to the fixed plate, facilitates the one-time fixation of the strain gauges, and improves the convenience of measuring the radial vibration and torque of the rotating shaft.

[0033] In some scenarios, the strain gauge for radial vibration and torque detection provided by the embodiment of the present application can be applied to the test of the radial vibration and torque of the rotating shaft, and can efficiently test the radial vibration and torque of the rotating shaft, thereby improving the convenience of testing the radial vibration and torque of the rotating shaft.

[0034] The strain gauge for radial vibration and torque detection provided by the embodiment of the present application will be described in detail below with reference to specific examples.

[0035] Figure 1 The structural schematic diagram of the strain gauge for radial vibration and torque detection provided by the embodiment of the present application is shown in FIG. 1, which comprises a first substrate 11, a second substrate 12, a third substrate 13 and a support body 2. The first substrate 11, the second substrate 12, the third substrate 13 and the support body 2 cooperatively complete the measurement of the radial vibration and torque of the rotating shaft. Figure 1

[0036] As shown in FIG. 2, the first substrate 11 is encapsulated with a first strain gauge 111 by a film coating, the second substrate 12 is encapsulated with a second strain gauge 121 by a film coating, and the third substrate 13 is encapsulated with a third strain gauge 131 by a film coating. The first strain gauge 111, the second strain gauge 121 and the third strain gauge 131 are used for detecting strain. Figure 1

[0037] For example, the first substrate 11, the second substrate 12 and the third substrate 13 can comprise a polyether ether ketone bottom film and a constantan foil attached to the polyether ether ketone bottom film. A polyether ether ketone protective film is attached to the constantan foil.

[0038] As shown in FIG. 3, one side edge of the third substrate 13 is provided with a connecting portion 14, and an angle portion of the first substrate 11 and the second substrate 12 close to each other is connected to the connecting portion 14. The first strain gauge 111, the second strain gauge 121 and the third strain gauge 131 all measure strain through a Wheatstone bridge. Figure 1

[0039] As shown in FIG. 4, one side edge of the third substrate 13 is provided with a connecting portion 14, and the connecting portion 14 is used for connecting the first substrate 11 and the second substrate 12. An angle portion of the first substrate 11 and the second substrate 12 close to each other is connected to the connecting portion 14, so that the first substrate 11, the second substrate 12 and the third substrate 13 form an integrated structure, and the attachment of the strain gauge is facilitated. Figure 1

[0040] For example, the first substrate 11, the second substrate 12 and the third substrate 13 can be integrally formed.

[0041] In terms of structure, as shown in FIG. 5, the first substrate 11, the second substrate 12 and the third substrate 13 are integrally formed. Figure 1 ​​​​As shown, the first strain gauge 111, the second strain gauge 121 and the third strain gauge 131 all measure strain through a Wheatstone bridge.

[0042] As shown in the drawings, Figure 1 As shown, the support body 2 includes a first support end 21, a second support end 22 and a fixed plate 23, the first support end 21 is used to cooperate with the rotating shaft 3, the second support end 22 is used to support the fixed plate 23, the fixed plate 23 is connected between the first support end 21 and the second support end 22, the fixed plate 23 is made of rigid material, the first substrate 11 and the second substrate 12 can be attached to the fixed plate 23 after bending at the connecting portion 14, and the third substrate 13 can be attached to the rotating shaft 3, so that the first strain gauge 111 and the second strain gauge 121 can measure the radial vibration of the rotating shaft 3, and the third strain gauge 131 can measure the axial strain of the rotating shaft 3.

[0043] As shown in the drawings, Figure 1 As shown, the support body 2 is used to install the strain gauge for strain measurement, and the support body 2 can include a first support end 21, a second support end 22 and a fixed plate 23, the first support end 21 is used to cooperate with the rotating shaft 3, so that the first support end 21 can transmit the vibration of the rotating shaft 3 to the first support end 21, the second support end 22 is used to support the fixed plate 23, and the fixed plate 23 is connected between the first support end 21 and the second support end 22, so that the first support end 21, the second support end 22 and the fixed plate 23 can form a support structure for supporting the fixed plate 23.

[0044] Exemplarily, when the rotating shaft 3 is in a stationary state, a fixed support structure can be arranged on the second support end 22, so as to facilitate the detection of the radial vibration of the rotating shaft 3 through the fixed second support end 22.

[0045] In structure, the fixed plate 23 is made of rigid material, so that the fixed plate 23 can transmit the vibration state transmitted from the rotating shaft 3 to the first support end 21 to the fixed plate 23, so that the strain of the fixed plate 23 can detect the radial vibration of the rotating shaft 3.

[0046] Exemplarily, the support body 2 can be made of the same or similar material as the strain characteristics of the rotating shaft 3, so that the support body 2 can detect the radial vibration of the rotating shaft 3.

[0047] As shown in the drawings, Figure 1 As shown, the first substrate 11 and the second substrate 12 can be attached to the fixed plate 23 after bending at the connecting portion 14, and the third substrate 13 can be attached to the rotating shaft 3, so that the first strain gauge 111 and the second strain gauge 121 can measure the radial vibration of the rotating shaft 3, and the third strain gauge 131 can measure the axial strain of the rotating shaft 3.

[0048] As shown in the drawings, Figure 1As shown, in use, the first base 11 and the second base 12 can be bent at the connecting part 14 and then attached to the fixing plate 23 respectively to realize the arrangement of the first base 11 and the second base 12. The rotating shaft 3 can transmit the vibration state of the rotating shaft 3 to the fixing plate 23 through the first support end 21, so that the first strain gauge 111 and the second strain gauge 121 can measure the radial vibration of the rotating shaft 3.

[0049] In use, the third substrate 13 can be attached to the rotating shaft 3, and the axial strain of the rotating shaft 3 can be detected through the third substrate 13.

[0050] The advantages of the above implementation method are that it transmits the vibration state of the shaft through the fixed plate, and the radial vibration can be detected by the first and second strain gauges on the fixed plate. The torque of the shaft can be measured by the third strain gauge, which facilitates the detection of the radial vibration and torque of the shaft.

[0051] The beneficial effect of the above implementation method is that the connecting part makes it easy to bend the first base and the second base onto the fixing plate, which facilitates the one-time fixing of the strain gauge and improves the convenience of measuring the radial vibration and torque of the rotating shaft.

[0052] The beneficial effect of the above implementation method is that by bending the first base and the second base at the connection point and attaching them to the fixing plate respectively, it is convenient to fix and arrange the first base and the second base, thus improving the ease of use of this strain gauge.

[0053] In some implementations, the connecting part 14 is provided with a terminal 141, which is electrically connected to the first strain gauge 111, the second strain gauge 121, and the third strain gauge 131 respectively through lines etched on the first substrate 11, the second substrate 12, and the third substrate 13.

[0054] like Figure 1 As shown, structurally, the first strain gauge 111, the second strain gauge 121 and the third strain gauge 131 need to be connected to cables for resistance measurement in order to detect strain.

[0055] In this embodiment of the application, a terminal block 141 is provided on the connecting part 14. The terminal block 141 is an integral structure. The terminal block 141 is electrically connected to the first strain gauge 111, the second strain gauge 121, and the third strain gauge 131 respectively through lines etched on the first substrate 11, the second substrate 12, and the third substrate 13, which facilitates the wiring of the first strain gauge 111, the second strain gauge 121, and the third strain gauge 131.

[0056] The implementation manner has the beneficial effects that the first strain gauge, the second strain gauge, the third strain gauge and the terminal are connected through etching lines, facilitating efficient production of the strain gauge and simplifying the line connection.

[0057] The implementation manner also has the beneficial effects that the terminal is connected with the external measuring component, facilitating use of the strain gauge.

[0058] In some implementation manners, the number of the support bodies 2 is 2, the end of the first support end 21 and the end of the second support end 22 of each support body 2 are transversely connected to a side wall of the fixed plate 23, the fixed plates 23 of the two support bodies 2 are in close contact with each other, and a flexible positioning glue 24 is arranged between the fixed plates 23 of the two support bodies 2.

[0059] Figure 2 A front view structural schematic diagram of a strain gauge for radial vibration and torque detection in a use state Figure 3 A front view structural schematic diagram of a strain gauge for radial vibration and torque detection in a use state Figure 2 A front view structural schematic diagram of a strain gauge for radial vibration and torque detection in a use state Figure 4 A front view structural schematic diagram of a strain gauge for radial vibration and torque detection in a use state Figure 5 A front view structural schematic diagram of a strain gauge for radial vibration and torque detection in a use state Figure 4 A front view structural schematic diagram of a strain gauge for radial vibration and torque detection in a use state Figures 2 to 5 As shown in the structure, the number of the support bodies 2 is 2, and the two support bodies 2 cooperate to complete measurement of strain caused by radial vibration.

[0060] As shown in the structure, the number of the support bodies 2 is 2, and the two support bodies 2 cooperate to complete measurement of strain caused by radial vibration. Figures 2 to 5 As shown in the structure, the number of the support bodies 2 is 2, and the two support bodies 2 cooperate to complete measurement of strain caused by radial vibration.

[0061] As shown in the structure, the number of the support bodies 2 is 2, and the two support bodies 2 cooperate to complete measurement of strain caused by radial vibration. Figures 2 to 5 As shown in the structure, the number of the support bodies 2 is 2, and the two support bodies 2 cooperate to complete measurement of strain caused by radial vibration.

[0062] Exemplarily, the positioning glue 24 can be made of a buffer glue with large flexibility and low viscosity.

[0063] The beneficial effect of the above implementation method is that the detection results of the radial vibration of the shaft are cross-checked by the two supports, which improves the accuracy of the radial vibration detection of the shaft.

[0064] The beneficial effect of the above implementation method is that the fixing plate can be relatively fixed by the positioning adhesive without affecting the accuracy of the strain test results of the fixing plate.

[0065] In some implementations, the cross-section of the first support end 21 is curved so that the first support end 21 can cooperate with the outer wall of the rotating shaft 3.

[0066] like Figures 2 to 5 As shown, structurally, the cross-section of the first support end 21 is curved, so that the first support end 21 can cooperate with the outer wall of the rotating shaft 3, thereby enabling the radial vibration on the rotating shaft 3 to be stably transmitted to the first support end 21, ensuring the accuracy of the detection of the radial vibration of the rotating shaft 3.

[0067] The beneficial effect of the above implementation method is that the first support end can cooperate with the outer wall of the shaft to ensure the accuracy of the detection of radial vibration of the shaft.

[0068] In some implementations, the strain gauge also includes a fixing ring 4 and a test assembly 5. The fixing ring 4 is located in the circumferential direction of the rotating shaft 3. Multiple strain gauges are arranged between the fixing ring 4 and the rotating shaft 3. The first support end 21 of the two supports 2 of each strain gauge abuts against the rotating shaft 3, and the second support end 22 of the two supports 2 of each strain gauge abuts against the fixing ring 4.

[0069] like Figures 2 to 5 As shown, this strain gauge also includes a fixing ring 4 and a test component 5. The fixing ring 4 is used to position multiple strain gauges, and the test component 5 is used to store the strain gauge's stored data.

[0070] During operation, the fixing ring 4 is located in the circumferential direction of the rotating shaft 3, and multiple strain gauges are installed between the fixing ring 4 and the rotating shaft 3, thereby positioning the rotating shaft 3 through the fixing ring 4.

[0071] Structurally, the first support end 21 of the two supports 2 of each strain gauge abuts against the rotating shaft 3, and the first support end 21 can be supported by the rotating shaft 3. The second support end 22 of the two supports 2 of each strain gauge abuts against the fixing ring 4, so that the fixing ring 4 can limit the second support end 22 within the fixing ring 4.

[0072] Structurally, the test assembly 5 is fixedly connected to the fixing ring 4, and the wiring terminals 141 of each strain gauge are connected to the test assembly 5 through cables, so that the measurement data of each strain gauge can be transmitted to the test assembly 5 for storage through cables.

[0073] The beneficial effect of the above implementation method is that by positioning multiple strain gauges with a fixed ring and detecting radial vibration using multiple strain gauges, the accuracy of vibration detection is improved.

[0074] The beneficial effect of the above implementation method is that, during the rotation of the shaft, multiple strain gauges are positioned by a fixed ring, and the measurement data of the strain gauges are stored by a test component, so that multiple strain gauges can perform radial vibration measurement during the rotation of the shaft. This is suitable for radial vibration measurement of multiple angles of the shaft during the rotation of the shaft.

[0075] In some implementations, the fixed ring 4 includes two detachable ring bodies, which are connected to multiple strain gauges by snap-fit ​​connections.

[0076] Structurally, the fixing ring 4 can include two detachable ring bodies, which are connected to multiple strain gauges by snap-fit. This allows the fixing ring 4 to be detachably installed to fix multiple strain gauges without having to be fitted onto the rotating shaft from the end of the rotating shaft 3, thus improving the convenience of installing multiple strain gauges.

[0077] The beneficial effect of the above implementation method is that it eliminates the need to attach the strain gauges from the end of the shaft to the shaft, thus improving the convenience of installing multiple strain gauges and measuring radial vibration.

[0078] In some implementations, multiple dampers 41 are provided on the fixed ring 4 along the circumference of the fixed ring 4.

[0079] like Figure 2 As shown, multiple dampers 41 are provided on the fixed ring 4 along the circumference of the fixed ring 4. The dampers 41 are used to provide radial damping for the fixed ring 4. The dampers can reduce vibration transmission, improve measurement stability and improve dynamic response in the system, thereby ensuring that multiple strain gauges can accurately and stably measure the radial vibration of the shaft.

[0080] The beneficial effect of the above implementation method is that the damper can improve the accuracy of multiple strain gauges measuring the radial vibration of the shaft on the fixed ring.

[0081] The embodiment of the present application also provides a strain detection method, which adopts the strain gauge for radial vibration and torque detection as any one of the above, and the method comprises the following steps: attaching the third substrate 13 to the rotating shaft 3, abutting and fitting the first supporting end 21 of the supporting body 2 to the outer side wall of the rotating shaft 3, attaching the first substrate 11 to the first side wall of the fixed plate 23, attaching the second substrate 12 to the second side wall of the fixed plate 23, measuring the radial vibration of the rotating shaft 3 through the first strain gauge 111 and the second strain gauge 121, and measuring the axial strain of the rotating shaft 3 through the third strain gauge 131.

[0082] As shown in the figure, when measuring, the third substrate 13 can be attached to the rotating shaft 3, the first supporting end 21 of the supporting body 2 can be abutted and fitted to the outer side wall of the rotating shaft 3, the first substrate 11 can be attached to the first side wall of the fixed plate 23, the second substrate 12 can be attached to the second side wall of the fixed plate 23, the radial vibration of the rotating shaft 3 can be measured through the first strain gauge 111 and the second strain gauge 121, and the axial strain of the rotating shaft 3 can be measured through the third strain gauge 131. Figure 1 The above-mentioned implementation manner has the beneficial effects that the radial vibration is detected through the first strain gauge and the second strain gauge on the fixed plate, the torque of the rotating shaft can be measured through the third strain gauge, and the first substrate and the second substrate are bent to the fixed plate through the connecting part, so that the strain gauges are fixed once, and the convenience of measuring the radial vibration and the torque of the rotating shaft is improved.

[0083]

[0084] A flowchart of a strain detection method provided by the embodiment of the present application is shown in the figure. Figure 6 The above-mentioned method further comprises S110 to S130, and S110 to S130 are specifically described as follows. Figure 6 S110, attaching the flexible positioning glue 24 between the fixed plates 23 of the two supporting bodies 2, attaching the first substrate 11 to the fixed plate 23 of one supporting body 2, and attaching the second substrate 12 to the fixed plate 23 of the other supporting body 2.

[0085] As shown in the figure, when measuring, the flexible positioning glue 24 can be attached between the fixed plates 23 of the two supporting bodies 2, and the fixed plates 23 of the two supporting bodies 2 can be preliminarily positioned through the positioning glue 24.

[0086] Figures 2 to 5 As shown in the figure, when measuring, the flexible positioning glue 24 can be attached between the fixed plates 23 of the two supporting bodies 2, and the fixed plates 23 of the two supporting bodies 2 can be preliminarily positioned through the positioning glue 24.

[0087] As shown in the figure, when measuring, the flexible positioning glue 24 can be attached between the fixed plates 23 of the two supporting bodies 2, and the fixed plates 23 of the two supporting bodies 2 can be preliminarily positioned through the positioning glue 24. Figures 2 to 5 ​As shown, the first base 11 can be attached to the fixing plate 23 of one support 2, and the second base 12 can be attached to the fixing plate 23 of another support 2. The first strain gauge 111 of the first base 11 can be used to measure the radial vibration of the fixing plate 23 of one support 2, and the second strain gauge 121 of the second base 12 can be used to measure the radial vibration of the fixing plate 23 of one support 2.

[0088] S120. A fixing ring 4 is fitted around the circumference of the rotating shaft 3, and multiple strain gauges are arranged between the fixing ring 4 and the rotating shaft 3. The first support end 21 of the two supports 2 of each strain gauge abuts against the rotating shaft 3, and the second support end 22 of the two supports 2 of each strain gauge abuts against the fixing ring 4.

[0089] During measurement, a fixing ring 4 can be fitted around the circumference of the rotating shaft 3, and multiple strain gauges can be arranged between the fixing ring 4 and the rotating shaft 3 to detect radial vibration of the multiple strain gauges through the fixing ring 4.

[0090] like Figures 2 to 5 As shown, the first support end 21 of the two supports 2 of each strain gauge abuts against the rotating shaft 3, and the second support end 22 of the two supports 2 of each strain gauge abuts against the fixing ring 4, thereby realizing the positioning of multiple strain gauges by the fixing ring 4.

[0091] S130. The radial vibration of the rotating shaft 3 is measured by the first strain gauge 111 and the second strain gauge 121, and the axial strain of the rotating shaft 3 is measured by the third strain gauge 131.

[0092] During operation, the radial vibration of the rotating shaft 3 can be measured by the first strain gauge 111 and the second strain gauge 121, and the axial strain of the rotating shaft 3 can be measured by the third strain gauge 131, thus enabling simultaneous measurement of the radial vibration and axial strain of the rotating shaft 3.

[0093] The beneficial effect of the above implementation method is that by positioning multiple strain gauges with a fixed ring and detecting radial vibration using multiple strain gauges, the accuracy of vibration detection is improved.

[0094] In some implementations, the above method further includes: fixing the test assembly 5 to the fixed ring 4, with each strain gauge's terminal 141 connected to the test assembly 5 via a cable; storing test data through the test assembly 5 during the rotation of the shaft 3; and analyzing the data in the test assembly 5 after the shaft 3 stops rotating to obtain the test results.

[0095] The beneficial effects brought by the above implementation manner are that, in the process of rotation of the rotating shaft, the plurality of strain gauges are positioned by the fixing ring, and the measurement data of the strain gauges are stored by the test assembly, so that the plurality of strain gauges can perform radial vibration measurement in the process of rotation of the rotating shaft, and the radial vibration measurement of a plurality of angles of the rotating shaft in the process of rotation of the rotating shaft is suitable.

[0096] In some implementations, the above method, after the rotating shaft 3 stops rotating, analyzes the data in the test assembly 5 to obtain a test result, including S210 to S220, which are described below.

[0097] S210, obtain the radial vibration values of the rotating shaft 3 measured by the first strain gauge 111 and the second strain gauge 121 of the plurality of strain gauges, and obtain the axial strain values of the rotating shaft 3 measured by the first strain gauge 111 and the second strain gauge 121 of the plurality of strain gauges.

[0098] In operation, the radial vibration values of the rotating shaft 3 measured by the first strain gauge 111 and the second strain gauge 121 of the plurality of strain gauges can be obtained, and the axial strain values of the rotating shaft 3 measured by the first strain gauge 111 and the second strain gauge 121 of the plurality of strain gauges can be obtained. Then, the radial vibration values of the rotating shaft 3 measured by the plurality of strain gauges and the axial strain values of the rotating shaft 3 can be analyzed, and the accuracy of the detection result of the radial vibration values of the rotating shaft 3 and the axial strain values of the rotating shaft 3 can be improved.

[0099] S220, when the average radial vibration values of the first strain gauge 111 and the second strain gauge 121 of the first strain gauge are greater than the preset average radial vibration value, the radial vibration measurement value of the first strain gauge is discarded, and the average radial vibration value of the first strain gauge 111 and the second strain gauge 121 of the strain gauge except the first strain gauge is determined as the radial vibration measurement value. The average axial strain value of the rotating shaft 3 measured by the third strain gauge 131 of the plurality of strain gauges is determined as the axial strain measurement value.

[0100] When analyzing, when the average radial vibration values of the first strain gauge 111 and the second strain gauge 121 of the first strain gauge are greater than the preset average radial vibration value, it indicates that the error of the radial vibration values of the first strain gauge 111 and the second strain gauge 121 of the first strain gauge is too large, and the radial vibration measurement value of the first strain gauge can be discarded to improve the accuracy of the radial vibration measurement.

[0101] After discarding the radial vibration measurement value of the first strain gauge, the average radial vibration value of the first strain gauge 111 and the second strain gauge 121 of the strain gauge except the first strain gauge can be determined as the radial vibration measurement value, and the accuracy of the radial vibration measurement value is improved.

[0102] After obtaining the measurement result, the average of the axial strain values of the rotating shaft 3 measured by the third strain gauges 131 of the plurality of strain gauges can be determined as the axial strain measurement value.

[0103] The implementation manner described above has the beneficial effect that the radial vibration values of the first strain gauges and the second strain gauges of the strain gauges with excessively large errors are discarded, the average of the radial vibration values of the first strain gauges and the second strain gauges of the strain gauges other than the strain gauges with excessively large errors is obtained as the radial vibration measurement value, and the measurement accuracy of the radial vibration measurement value can be improved.

[0104] The implementation manner described above also has the beneficial effect that the average of the axial strain values in different directions in the circumferential direction of the rotating shaft is obtained as the measured axial strain measurement value, and the measurement accuracy of the axial strain measurement value is improved.

[0105] In some implementation manners, the method described above further includes S310 to S320, which are specifically described below.

[0106] S310, the radial vibration values of the first strain gauges 111 and the second strain gauges 121 of the first strain gauge in the first time period are obtained, and the average of the radial vibration values of the first strain gauges 111 and the second strain gauges 121 of the first strain gauge in the first time period is determined. The axial strain measurement value of the third strain gauge 131 of the first strain gauge in the first time period is obtained, and the average of the axial strain values of the third strain gauge 131 of the first strain gauge in the first time period is determined.

[0107] After obtaining the measurement result, the radial vibration values of the first strain gauges 111 and the second strain gauges 121 of the first strain gauge in the first time period can be obtained from the test assembly 5, and the average of the radial vibration values of the first strain gauges 111 and the second strain gauges 121 of the first strain gauge in the first time period is determined. The average of the radial vibration values represents the average of the measurement results of the first strain gauge in the first time period.

[0108] After obtaining the measurement result, the axial strain measurement value of the third strain gauge 131 of the first strain gauge in the first time period can be obtained, and the average of the axial strain values of the third strain gauge 131 of the first strain gauge in the first time period is determined. The average of the axial strain values represents the average of the axial strain values in the first time period.

[0109] S320, when the ratio of the radial vibration value at the first time and the average of the radial vibration values is greater than a preset ratio, and the ratio of the axial strain measurement value at the first time and the average of the axial strain values is greater than a preset ratio, the radial vibration value and the axial strain measurement value at the first time are discarded.

[0110] When the ratio of the radial vibration value at the first time and the radial vibration average value is greater than the preset ratio, it indicates that the radial vibration value at the first time and the radial vibration average value are too different; when the ratio of the axial strain measurement value at the first time and the axial strain average value is greater than the preset ratio, it indicates that the axial strain measurement value at the first time and the axial strain average value are too different, which indicates that the radial vibration value and the axial strain measurement value of the rotating shaft at the first time may be fluctuated due to external collision or other interference, and the radial vibration value and the axial strain measurement value at the first time can be discarded.

[0111] The above-mentioned implementation manner has the beneficial effects that the fluctuation of the radial vibration value and the axial strain measurement value of the rotating shaft caused by external collision or other interference can be detected, and the radial vibration value and the axial strain measurement value with too large fluctuation amplitude caused by external collision or other interference can be discarded, so that the measurement accuracy of the radial vibration value and the axial strain measurement value can be improved.

[0112] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A strain gauge for radial vibration and torque detection, characterized by, The strain gauge comprises: a first substrate, a first strain gauge encapsulated on the first substrate by a film; a second substrate, a second strain gauge encapsulated on the second substrate by a film; a third substrate, a third strain gauge encapsulated on the third substrate by a film, a connecting portion provided on one side edge of the third substrate, and a corner portion of the first substrate and the second substrate connected to the connecting portion, the first strain gauge, the second strain gauge and the third strain gauge all measuring strain through a Wheatstone bridge; a support body comprising a first support end, a second support end and a fixed plate, the first support end used for cooperating with a rotating shaft, the second support end used for supporting the fixed plate, the fixed plate connected between the first support end and the second support end, the fixed plate made of a rigid material, the first substrate and the second substrate capable of being attached to the fixed plate after being bent at the connecting portion, and the third substrate capable of being attached to the rotating shaft, so that the first strain gauge and the second strain gauge can measure radial vibration of the rotating shaft, and the third strain gauge can measure axial strain of the rotating shaft; a terminal provided on the connecting portion, the terminal electrically connected to the first strain gauge, the second strain gauge and the third strain gauge through lines etched on the first substrate, the second substrate and the third substrate; the number of the support bodies is two, the end of the first support end and the end of the second support end of each support body are both transversely connected to a side wall of the fixed plate, the fixed plates of the two support bodies are attached to each other, and flexible positioning glue is provided between the fixed plates of the two support bodies; the strain gauge further comprises a fixing ring and a test assembly, the fixing ring is provided in the circumferential direction of the rotating shaft, a plurality of strain gauges are provided between the fixing ring and the rotating shaft, the first support end of the two support bodies of each strain gauge abuts against the rotating shaft, and the second support end of the two support bodies of each strain gauge abuts against the fixing ring; the test assembly is fixedly connected to the fixing ring, and the terminal of each strain gauge is connected to the test assembly through a cable.

2. The strain gauge of claim 1, wherein, The cross section of the first support end is in a curve shape, so that the first support end can cooperate with the outer side wall of the rotating shaft.

3. The strain gauge of claim 1, wherein, The fixing ring comprises two detachable ring bodies, and the two detachable ring bodies are connected to the plurality of strain gauges through a buckle sleeve.

4. The strain gauge of claim 3, wherein, A plurality of dampers are provided on the fixing ring in the circumferential direction of the fixing ring.

5. A strain detection method characterized by, The method for detecting radial vibration and torque by using the strain gauge according to any one of claims 1 to 4 comprises: attaching the third substrate to the rotating shaft, abutting and cooperating the first support end of the support body to the outer side wall of the rotating shaft, attaching the first substrate to the first side wall of the fixed plate, attaching the second substrate to the second side wall of the fixed plate, measuring radial vibration of the rotating shaft through the first strain gauge and the second strain gauge, and measuring axial strain of the rotating shaft through the third strain gauge.

6. The strain detection method of claim 5, wherein, The method further comprises: attaching flexible positioning glue between the fixed plates of the two support bodies, attaching the first substrate to the fixed plate of one support body, and attaching the second substrate to the fixed plate of the other support body; sleeving the fixing ring in the circumferential direction of the rotating shaft, and arranging a plurality of strain gauges between the fixing ring and the rotating shaft, the first support end of the two support bodies of each strain gauge abutting against the rotating shaft, and the second support end of the two support bodies of each strain gauge abutting against the fixing ring; and The radial vibration of the rotating shaft is measured by the first and second strain gauges, and the axial strain of the rotating shaft is measured by the third strain gauge.

7. The strain detection method of claim 6, wherein, The method further comprises: The test assembly is fixedly connected on the fixing ring, the wiring terminals of each strain gauge are connected with the test assembly through cables, the test data is stored through the test assembly during rotation of the rotating shaft, and the test data in the test assembly is analyzed after the rotating shaft stops rotating to obtain the test result.

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