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

Abstract

The invention relates to the field of strain detection, and discloses a strain gauge for radial vibration and torque detection, and the strain gauge comprises a first substrate which is provided with a first strain gauge in a packaging manner through a covering film; a second substrate, wherein a second strain gauge is packaged on the second substrate through a covering film; a third strain gauge is packaged on the third substrate through a covering film, a connecting part is arranged on one side edge of the third substrate, one corner part, close to each other, of the first substrate and the second substrate is connected to the connecting part, and the first strain gauge, the second strain gauge and the third strain gauge measure the strain through a Wheatstone bridge; the supporting body comprises a first supporting end, a second supporting end and a fixing plate, the first supporting end is used for being matched with the rotating shaft, the fixing plate is connected between the first supporting end and the second supporting end, the first base and the second base can be attached to the fixing plate after being bent at the connecting part, and the third base can be attached to the rotating shaft. According to the invention, radial vibration and torque can be detected at the same time.

Description

Technical Field

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

[0002] The strain of mechanical parts is a very important engineering parameter, so the accurate measurement of the strain of mechanical parts is of great significance. Strain gauges (also known as strain sensors) are a measuring tool used to measure the strain of mechanical parts caused by force. Resistance strain gauges are the most commonly used strain gauges. Conventional strain gauges are 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. When some mechanical parts are used, it is necessary to monitor the torque and vibration of the mechanical parts to achieve the monitoring of the motion state of the mechanical parts. For example, when shaft parts are used, it is necessary to monitor the radial vibration state and torque of the shaft parts to achieve the monitoring of the working state of the shaft parts. When monitoring the radial vibration and torque of shaft parts, the strain caused by radial strain and torque can also be monitored by strain gauges to achieve the monitoring of radial vibration and torque of shaft parts.

[0003] Existing strain gauges are difficult to monitor radial vibration and torque of shaft parts at the same time. For example, patent CN216524470U (application number: CN202123072334.4) provides an integrated strain gauge for a torque ring sensor, including a base, strain gauge 1, strain gauge 2, strain gauge 3 and strain gauge 4, the base is set as a circular ring structure, and strain gauges 1, strain gauge 2, strain gauge 3 and strain gauge 4 are equidistantly arranged on the base, the strain gauges 1, strain gauge 2, strain gauge 3 and strain gauge 4 are distributed in a ring with the center of the base as the center, and the strain gauges 1, strain gauge 2, strain gauge 3 and strain gauge 4 are arranged on the same plane. The strain gauges 1, strain gauge 2, strain gauge 3 and strain gauge 4 used for the integrated strain gauge of the torque ring sensor in patent CN216524470U can detect torque by fixing them on the base in a full-bridge circuit integrated design, but the strain gauge in patent CN216524470U cannot detect radial vibration and torque at the same time. Summary of the invention

[0004] The purpose of this application is to provide a strain gauge and strain detection method for radial vibration and torque detection, which solves the technical problem that radial vibration and torque cannot be detected simultaneously, and achieves the technical effect of detecting radial vibration and torque simultaneously.

[0005] A strain gauge for radial vibration and torque detection provided in an embodiment of the present application includes: a first substrate, on which a first strain gauge is packaged by a film; a second substrate, on which a second strain gauge is packaged by a film; a third substrate, on which a third strain gauge is packaged by a film, a connecting portion is provided on one side of the third substrate, a corner portion of the first substrate and the second substrate that is close to each other is connected to the connecting portion, and 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 supporting end, a second supporting end and a fixed plate, the first supporting end is used to cooperate with a rotating shaft, the second supporting end is used to support the fixed plate, the fixed plate is connected between the first supporting end and the second supporting end, the fixed plate is made of rigid material, the first substrate and the second substrate 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, 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.

[0006] In a possible implementation, the connection portion is provided with a connection terminal, and the connection terminal is electrically connected to the first strain gauge, the second strain gauge, and the third strain gauge respectively through circuits etched on the first substrate, the second substrate, and the third substrate.

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

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

[0009] In another possible implementation, it also includes a fixing ring and a test assembly, the fixing ring is arranged on the circumference of the rotating shaft, a plurality of strain gauges are arranged between the fixing ring and the rotating shaft, the first supporting ends of the two supporting bodies of each strain gauge are abutted against the rotating shaft, and the second supporting ends of the two supporting bodies of each strain gauge are abutted against the fixing ring; the test assembly is fixedly connected to the fixing ring, and the wiring terminals of each strain gauge are connected to the test assembly through cables.

[0010] In another possible implementation, the fixing ring includes two detachable ring bodies, and the two detachable ring bodies are connected to the plurality of strain gauges through a snap-fit ​​sleeve connection.

[0011] In another possible implementation, a plurality of dampers are provided on the fixing ring along the circumference of the fixing ring.

[0012] In another possible implementation, a strain gauge for radial vibration and torque detection according to any one of claims 1 to 7 is used, and the method includes: attaching a third substrate to a rotating shaft, abutting the first supporting end of the support body against the outer 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 the radial vibration of the rotating shaft by the first strain gauge and the second strain gauge, and measuring the axial strain of the rotating shaft by the third strain gauge.

[0013] An embodiment of the present application also provides a strain detection method, which uses a strain gauge for radial vibration and torque detection as described in any of the above items, and the method also includes: attaching a flexible positioning glue between the fixing plates of two support bodies, attaching the first substrate to the fixing plate of one support body, and attaching the second substrate to the fixing plate of the other support body; arranging a fixing ring on the circumference of the rotating shaft, and arranging multiple strain gauges between the fixing ring and the rotating shaft, the first supporting ends of the two supporting bodies of each strain gauge are abutted against the rotating shaft, and the second supporting ends of the two supporting bodies of each strain gauge are abutted against the fixing ring; measuring the radial vibration of the rotating shaft by the first strain gauge and the second strain gauge, and measuring the axial strain of the rotating shaft by the third strain gauge.

[0014] In another possible implementation, the method also includes: fixing a test component on the fixed ring, connecting the wiring terminals of each strain gauge to the test component via a cable, storing test data via the test component during the rotation of the shaft, and analyzing the data in the test component after the shaft stops rotating to obtain a test result.

[0015] In another possible implementation, after the rotating shaft stops rotating, the data in the test assembly is analyzed to obtain the test results, including: obtaining the radial vibration value of the rotating shaft measured by the first strain gauge and the second strain gauge of the multiple strain gauges, and obtaining the axial strain value of the rotating shaft measured by the first strain gauge and the second strain gauge of the multiple strain gauges; when the average value of the radial vibration value of the first strain gauge and the second strain gauge of the first strain gauge is greater than the preset radial vibration value average value, the radial vibration measurement value of the first strain gauge is discarded, and the average value of the radial vibration value of the first strain gauge and the second strain gauge of the strain gauges other than the first strain gauge is determined as the radial vibration measurement value; and the average value of the axial strain value of the rotating shaft measured by the third strain gauge of the multiple strain gauges is determined as the axial strain measurement value.

[0016] In another possible implementation, the method also includes: obtaining radial vibration values ​​of the first strain gauge and the second strain gauge of the first strain gauge within the first time period, and determining the radial vibration mean of the first strain gauge and the second strain gauge of the first strain gauge within the first time period; obtaining the axial strain measurement value of the third strain gauge of the first strain gauge within the first time period, and determining the axial strain mean of the third strain gauge of the first strain gauge within the first time period; when the ratio of the radial vibration value at the first moment to the radial vibration mean is greater than a preset ratio, and the ratio of the axial strain measurement value at the first moment to the axial strain mean is greater than the preset ratio, discarding the radial vibration value and the axial strain measurement value at the first moment.

[0017] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0018] The embodiment of the present application provides a strain gauge for radial vibration and torque detection, including: a first substrate, on which a first strain gauge is packaged by a film; a second substrate, on which a second strain gauge is packaged by a film; a third substrate, on which a third strain gauge is packaged by a film, a connecting portion is provided on one side edge of the third substrate, a corner portion of the first substrate and the second substrate that is close to each other is connected to the connecting portion, and 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 supporting end, a second supporting end and a fixed plate, the first supporting end is used to cooperate with a rotating shaft, the second supporting end is used to support the fixed plate, the fixed plate is connected between the first supporting end and the second supporting end, the fixed plate is made of rigid material, the first substrate and the second substrate 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, 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. A strain gauge for radial vibration and torque detection in the embodiment of the present application transmits the vibration state of the rotating shaft through a fixed plate, and can detect the radial vibration through a first strain gauge and a second strain gauge on the fixed plate, and can measure the torque of the rotating shaft through a third strain gauge. The first base and the second base can be bent onto the fixed plate through a connecting portion, which facilitates one-time fixation of the strain gauge, thereby improving the convenience of measuring the radial vibration and torque of the rotating shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

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

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

[0022] Figure 3 for Figure 2 A schematic diagram of the local structure of a strain gauge for radial vibration and torque detection at position A;

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

[0024] Figure 5 for Figure 4 A schematic diagram of the local structure at B of a strain gauge for radial vibration and torque detection;

[0025] Figure 6 A schematic diagram of a flow chart of a strain detection method provided in 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 portion; 141, terminal; 2, support body; 21, first support end; 22, second support end; 23, fixing plate; 24, positioning glue; 3, rotating shaft; 4, fixing ring; 41, damper; 5, test assembly. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0028] It should be noted that when a component or structure is referred to as being "fixed to" or "disposed on" another component or structure, it may 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 being "connected to" another component or structure, it may 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", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or a component or structure referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0031] Existing strain gauges cannot detect radial vibration and torque at the same time.

[0032] Based on the above reasons, an embodiment of the present application provides a strain gauge for radial vibration and torque detection, including: a first substrate, on which a first strain gauge is packaged by a film; a second substrate, on which a second strain gauge is packaged by a film; a third substrate, on which a third strain gauge is packaged by a film, and a connecting portion is provided on one side edge of the third substrate, and a corner portion of the first substrate and the second substrate that is close to each other is connected to the connecting portion, and 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 supporting end, a second supporting end and a fixed plate, the first supporting end is used to cooperate with the rotating shaft, and the second supporting end is used to support the fixed plate, the fixed plate is connected between the first supporting end and the second supporting end, and the fixed plate is made of rigid material, the first substrate and the second substrate 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, 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. A strain gauge for radial vibration and torque detection in the embodiment of the present application transmits the vibration state of the rotating shaft through a fixed plate, and can detect the radial vibration through a first strain gauge and a second strain gauge on the fixed plate, and can measure the torque of the rotating shaft through a third strain gauge. The first base and the second base can be bent onto the fixed plate through a connecting portion, which facilitates one-time fixation of the strain gauge, thereby improving the convenience of measuring the radial vibration and torque of the rotating shaft.

[0033] In some scenarios, a strain gauge for radial vibration and torque detection in an embodiment of the present application can be used in the testing of radial vibration and torque of a rotating shaft, which can efficiently test the radial vibration and torque of the rotating shaft and improve the convenience of testing the radial vibration and torque of the rotating shaft.

[0034] The following is a detailed description of a strain gauge for radial vibration and torque detection provided in an embodiment of the present application with reference to specific examples.

[0035] Figure 1 A schematic diagram of the structure of a strain gauge for radial vibration and torque detection provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, it includes a first substrate 11, a second substrate 12, a third substrate 13 and a support body 2, and the first substrate 11, the second substrate 12, the third substrate 13 and the support body 2 cooperate with each other to complete the measurement of the radial vibration and torque of the rotating shaft.

[0036] like Figure 1 As shown, a first strain gauge 111 is packaged on the first substrate 11 through a coating, a second strain gauge 121 is packaged on the second substrate 12 through a coating, and a third strain gauge 131 is packaged on the third substrate 13 through a coating. The first strain gauge 111, the second strain gauge 121 and the third strain gauge 131 are used to detect strain.

[0037] Illustratively, the first substrate 11, the second substrate 12 and the third substrate 13 may include a polyetheretherketone base film and a constantan foil laminated on the polyetheretherketone base film, and a polyetheretherketone protective film is laminated on the constantan foil.

[0038] like Figure 1 As shown, a connecting portion 14 is provided on one side of the third substrate 13, a corner of the first substrate 11 and the second substrate 12 close to each other is connected to the connecting portion 14, and the first strain gauge 111, the second strain gauge 121 and the third strain gauge 131 all measure strain through a Wheatstone bridge.

[0039] like Figure 1 As shown, a connecting portion 14 is provided on one side of the third substrate 13, and the connecting portion 14 is used to connect the first substrate 11 and the second substrate 12. A corner of the first substrate 11 and the second substrate 12 that is 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, which is convenient for the bonding of the strain gauge.

[0040] Exemplarily, the first substrate 11 , the second substrate 12 , and the third substrate 13 may be manufactured by integral molding.

[0041] In terms of structure, Figure 1As 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] like 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, and 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 respectively after the connecting portion 14 is bent, 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] like Figure 1 As shown, the support body 2 is used to install the strain gauge for strain measurement. The support body 2 may 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, and 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, so that the first support end 21, the second support end 22 and the fixed plate 23 can form a support structure supported by the fixed plate 23.

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

[0045] Structurally, the fixing plate 23 is made of a rigid material, so that the fixing plate 23 can transmit the vibration state transmitted from the rotating shaft 3 to the fixing plate 23 , so that the radial vibration of the rotating shaft 3 can be detected through the strain of the fixing plate 23 .

[0046] Exemplarily, the support body 2 may be made of a material having the same or similar strain characteristics as the shaft 3 , so that the radial vibration of the shaft 3 can be detected through the support body 2 .

[0047] like Figure 1 As shown, the first substrate 11 and the second substrate 12 can be attached to the fixed plate 23 respectively after being bent 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] like Figure 1As shown, when in use, the first substrate 11 and the second substrate 12 can be bent at the connecting portion 14 and then attached to the fixed plate 23 respectively, so as to realize the arrangement of the first substrate 11 and the second substrate 12. The rotating shaft 3 can transmit the vibration state of the rotating shaft 3 to the fixed plate 23 through the first supporting 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] When in use, the third substrate 13 may continue to be attached to the rotating shaft 3 , and the axial strain of the rotating shaft 3 may be detected through the third substrate 13 .

[0050] The beneficial effect brought by the above implementation method is that the vibration state of the rotating shaft is transmitted through the fixed plate, and the radial vibration can be detected by the first strain gauge and the second strain gauge on the fixed plate, and the torque of the rotating shaft can be measured by the third strain gauge, which can conveniently detect the radial vibration and torque of the rotating shaft.

[0051] The beneficial effect brought about by the above implementation method is that the first substrate and the second substrate can be bent onto the fixing plate through the connecting portion, so that the strain gauge can be fixed at one time, thereby improving the convenience of measuring the radial vibration and torque of the rotating shaft.

[0052] The beneficial effect brought by the above implementation method is that by bending the first substrate and the second substrate at the connection part and attaching them to the fixing plate respectively, the first substrate and the second substrate are easily fixed and arranged, thereby improving the convenience of using the strain gauge.

[0053] In some implementations, the connection portion 14 is provided with a connection terminal 141 , and the connection terminal 141 is electrically connected to the first strain gauge 111 , the second strain gauge 121 , and the third strain gauge 131 respectively through circuits 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 when in use, so as to detect the strain.

[0055] In the embodiment of the present application, a wiring terminal 141 is provided on the connecting portion 14. The wiring terminal 141 is an integrated structure. The wiring terminal 141 is electrically connected to the first strain gauge 111, the second strain gauge 121, and the third strain gauge 131 through circuits etched on the first substrate 11, the second substrate 12, and the third substrate 13, respectively, to facilitate the wiring of the first strain gauge 111, the second strain gauge 121, and the third strain gauge 131.

[0056] The beneficial effect brought about by the above implementation is that the first strain gauge, the second strain gauge, the third strain gauge and the wiring terminal are connected through an etched circuit, which facilitates the efficient production of the strain gauge and simplifies the circuit connection.

[0057] The beneficial effect brought about by the above implementation is that the connection terminal and the external measurement component are connected, which facilitates the use of the strain gauge.

[0058] In some implementations, the number of support bodies 2 is two, and 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 fixing plate 23, the fixing plates 23 of the two support bodies 2 are fitted together, and a flexible positioning glue 24 is provided between the fixing plates 23 of the two support bodies 2.

[0059] Figure 2 A schematic diagram of the main structure of a strain gauge for radial vibration and torque detection provided in an embodiment of the present application in use Figure 3 for Figure 2 A schematic diagram of the local structure of a strain gauge for radial vibration and torque detection at A. Figure 4 A left-side structural schematic diagram of a strain gauge for radial vibration and torque detection provided in an embodiment of the present application in a use state, Figure 5 for Figure 4 A schematic diagram of the local structure of a strain gauge at position B for radial vibration and torque detection, as shown in FIG. Figures 2 to 5 As shown, in terms of structure, there are two supporting bodies 2, and the two supporting bodies 2 cooperate with each other to complete the measurement of strain caused by radial vibration.

[0060] like Figures 2 to 5 As shown, the end of the first support end 21 and the end of the second support end 22 of each support body 2 are both laterally connected to a side wall of the fixing plate 23, and the fixing plates 23 of the two support bodies 2 fit together, so that the two support bodies 2 can individually detect the radial vibration of the rotating shaft 3, and the detection results of the radial vibration of the rotating shaft 3 by the two support bodies 2 can be mutually verified, thereby improving the accuracy of the radial vibration detection of the rotating shaft 3.

[0061] like Figures 2 to 5 As shown, a flexible positioning glue 24 is provided between the fixing plates 23 of the two support bodies 2 , and the fixing plates 23 can be relatively fixed by the positioning glue 24 without affecting the strain detection result of the fixing plates 23 .

[0062] Exemplarily, the positioning glue 24 may be made of a buffer glue with greater flexibility and lower viscosity.

[0063] The beneficial effect brought about by the above implementation method is that the detection results of the radial vibration of the rotating shaft by the two supporting bodies are mutually verified, thereby improving the accuracy of the radial vibration detection of the rotating shaft.

[0064] The beneficial effect brought about by the above implementation method is that the fixing plate can be relatively fixed by the positioning glue, and the accuracy of the strain detection result of the fixing plate is not affected.

[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 side 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, thereby ensuring the accuracy of detecting the radial vibration of the rotating shaft 3.

[0067] The beneficial effect brought about by the above implementation manner is that the first support end can cooperate with the outer side wall of the rotating shaft to ensure the accuracy of detecting the radial vibration of the rotating shaft.

[0068] In some implementations, the strain gauge also includes a fixed ring 4 and a test assembly 5. The fixed ring 4 is arranged on the circumference of the rotating shaft 3. Multiple strain gauges are arranged between the fixed ring 4 and the rotating shaft 3. The first support ends 21 of the two support bodies 2 of each strain gauge are abutted against the rotating shaft 3, and the second support ends 22 of the two support bodies 2 of each strain gauge are abutted against the fixed ring 4.

[0069] like Figures 2 to 5 As shown, the strain gauge further includes a fixing ring 4 and a testing assembly 5. The fixing ring 4 is used to position a plurality of strain gauges, and the testing assembly 5 is used to store the storage data of the strain gauge.

[0070] During operation, the fixing ring 4 is arranged on the circumference of the rotating shaft 3 , and a plurality of strain gauges are arranged between the fixing ring 4 and the rotating shaft 3 , so that the rotating shaft 3 is positioned through the fixing ring 4 .

[0071] Structurally, the first support ends 21 of the two support bodies 2 of each strain gauge are in contact with the rotating shaft 3, and the first support ends 21 can be supported by the rotating shaft 3. The second support ends 22 of the two support bodies 2 of each strain gauge are in contact with 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 component 5 is fixedly connected to the fixing ring 4, and the connection terminal 141 of each strain gauge is connected to the test component 5 via a cable, so that the measurement data of each strain gauge can be transmitted to the test component 5 via the cable for storage.

[0073] The beneficial effect brought about by the above implementation manner is that the plurality of strain gauges are positioned by the fixing ring, and the radial vibration is detected by the plurality of strain gauges, thereby improving the accuracy of vibration detection.

[0074] The beneficial effect brought about by the above-mentioned 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, which is suitable for radial vibration measurement of multiple angles of the shaft during the rotation of the shaft.

[0075] In some implementations, the fixing ring 4 includes two detachable ring bodies, and the two detachable ring bodies are connected to the plurality of strain gauges through a snap-fit ​​connection.

[0076] Structurally, the fixing ring 4 may include two detachable ring bodies, which are connected to multiple strain gauges by snap-fitting, so that the fixing ring 4 can be detachably installed to fix multiple strain gauges without having to be sleeved onto the rotating shaft from the end of the rotating shaft 3, thereby improving the convenience of installing multiple strain gauges.

[0077] The beneficial effect brought about by the above implementation method is that it is not necessary to sleeve the end of the rotating shaft onto the rotating shaft, thereby improving the convenience of installing multiple strain gauges and measuring radial vibration.

[0078] In some implementations, a plurality of dampers 41 are disposed on the fixing ring 4 along the circumference of the fixing ring 4 .

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

[0080] The beneficial effect brought about by the above implementation is that the damper can improve the accuracy of the radial vibration of the rotating shaft measured by the multiple strain gauges on the fixed ring.

[0081] An embodiment of the present application also provides a strain detection method, using a strain gauge for radial vibration and torque detection as described in any of the above items, the method comprising: attaching the third substrate 13 to the rotating shaft 3, abutting the first supporting end 21 of the support body 2 against the outer wall of the rotating shaft 3, and 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 by the first strain gauge 111 and the second strain gauge 121, and measuring the axial strain of the rotating shaft 3 by the third strain gauge 131.

[0082] like Figure 1 As shown, when measuring, the third substrate 13 can be attached to the rotating shaft 3, the first supporting end 21 of the support body 2 can be abutted against the outer wall of the rotating shaft 3, and the first substrate 11 can be attached to the first side wall of the fixed plate 23, and 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 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.

[0083] The beneficial effect brought about by the above-mentioned implementation method is that the radial vibration is detected by the first strain gauge and the second strain gauge on the fixed plate, and the torque of the rotating shaft can be measured by the third strain gauge, and the first base and the second base are conveniently bent onto the fixed plate through the connecting part, so that the strain gauge can be fixed at one time, thereby improving the convenience of measuring the radial vibration and torque of the rotating shaft.

[0084] Figure 6 A flow chart of a strain detection method provided in an embodiment of the present application is shown as follows: Figure 6 As shown, the above method further includes S110 to S130, and S110 to S130 are described in detail below.

[0085] S110 , attaching a flexible positioning adhesive 24 between the fixing plates 23 of the two support bodies 2 , attaching the first substrate 11 to the fixing plate 23 of one support body 2 , and attaching the second substrate 12 to the fixing plate 23 of the other support body 2 .

[0086] like Figures 2 to 5 As shown, during measurement, a flexible positioning adhesive 24 may be attached between the fixing plates 23 of the two supporting bodies 2 , and the fixing plates 23 of the two supporting bodies 2 may be preliminarily positioned by the positioning adhesive 24 .

[0087] like Figures 2 to 5As shown, the first substrate 11 can be attached to the fixing plate 23 of one support body 2, and the second substrate 12 can be attached to the fixing plate 23 of another support body 2. The radial vibration of the fixing plate 23 of one support body 2 can be measured by the first strain gauge 111 of the first substrate 11, and the radial vibration of the fixing plate 23 of one support body 2 can be measured by the second strain gauge 121 of the second substrate 12.

[0088] S120. A fixing ring 4 is sleeved on the circumference of the rotating shaft 3, and a plurality of strain gauges are arranged between the fixing ring 4 and the rotating shaft 3. The first supporting ends 21 of the two supporting bodies 2 of each strain gauge are in contact with the rotating shaft 3, and the second supporting ends 22 of the two supporting bodies 2 of each strain gauge are in contact with the fixing ring 4.

[0089] During measurement, a fixing ring 4 may be sleeved on the circumference of the rotating shaft 3 , and a plurality of strain gauges may be arranged between the fixing ring 4 and the rotating shaft 3 , so that radial vibration detection of the plurality of strain gauges may be performed through the fixing ring 4 .

[0090] like Figures 2 to 5 As shown, the first support ends 21 of the two support bodies 2 of each strain gauge are in contact with the rotating shaft 3, and the second support ends 22 of the two support bodies 2 of each strain gauge are in contact with the fixing ring 4, so that the fixing ring 4 can position multiple strain gauges.

[0091] S130 , measuring the radial vibration of the rotating shaft 3 by using the first strain gauge 111 and the second strain gauge 121 , and measuring the axial strain of the rotating shaft 3 by using 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 , thereby simultaneously measuring the radial vibration and the axial strain of the rotating shaft 3 .

[0093] The beneficial effect brought about by the above implementation manner is that the plurality of strain gauges are positioned by the fixing ring, and the radial vibration is detected by the plurality of strain gauges, thereby improving the accuracy of vibration detection.

[0094] In some implementations, the above method also includes: fixing the test component 5 on the fixed ring 4, the terminal 141 of each strain gauge is connected to the test component 5 through a cable, and during the rotation of the shaft 3, the test data is stored through the test component 5, and after the shaft 3 stops rotating, the data in the test component 5 is analyzed to obtain the test results.

[0095] The beneficial effect brought about by the above-mentioned implementation method is that during the rotation of the shaft, multiple 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 multiple strain gauges can perform radial vibration measurement during the rotation of the shaft, which is suitable for radial vibration measurement of multiple angles of the shaft during the rotation of the shaft.

[0096] In some implementations, in the above method, after the rotating shaft 3 stops rotating, the data in the test component 5 is analyzed to obtain the test results, including S210 to S220, and S210 to S220 are described in detail below.

[0097] S210, obtaining 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 obtaining 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] During operation, the radial vibration value of the rotating shaft 3 measured by the first strain gauge 111 and the second strain gauge 121 of the multiple strain gauges can be obtained, and the axial strain value of the rotating shaft 3 measured by the first strain gauge 111 and the second strain gauge 121 of the multiple strain gauges can be obtained, and then the radial vibration value of the rotating shaft 3 and the axial strain value of the rotating shaft 3 measured by the multiple strain gauges can be analyzed to improve the accuracy of the detection results of the radial vibration value of the rotating shaft 3 and the axial strain value of the rotating shaft 3.

[0099] S220, when the radial vibration value average of the first strain gauge 111 and the second strain gauge 121 of the first strain gauge is greater than the preset radial vibration value average, the radial vibration measurement value of the first strain gauge is discarded, and the radial vibration value average of the first strain gauge 111 and the second strain gauge 121 of the strain gauges other than the first strain gauge is determined as the radial vibration measurement value. The axial strain value average 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] During the analysis, when the average radial vibration value of the first strain gauge 111 and the second strain gauge 121 of the first strain gauge is greater than the preset average radial vibration value, it means that the error of the radial vibration value 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 value 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 gauges other than the first strain gauge may be determined as the radial vibration measurement value, thereby improving the accuracy of the radial vibration measurement value.

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

[0103] The beneficial effect brought by the above-mentioned implementation method is that the radial vibration values ​​of the first strain gauge and the second strain gauge of the strain gauge with excessive error are discarded, and the average radial vibration values ​​of the first strain gauge and the second strain gauge of the strain gauge other than the strain gauge with excessive error are obtained as the radial vibration measurement value, which can improve the measurement accuracy of the radial vibration measurement value.

[0104] The beneficial effect brought about by the above implementation method is that the average of the axial strain values ​​in different directions on the circumference of the rotating shaft is used as the measured axial strain measurement value, thereby improving the measurement accuracy of the axial strain measurement value.

[0105] In some implementations, the above method further includes S310 to S320, and S310 to S320 are described in detail below.

[0106] S310, obtaining radial vibration values ​​of the first strain gauge 111 and the second strain gauge 121 of the first strain gauge in the first time period, and determining the radial vibration mean value of the first strain gauge 111 and the second strain gauge 121 of the first strain gauge in the first time period. Obtaining the axial strain measurement value of the third strain gauge 131 of the first strain gauge in the first time period, and determining the axial strain mean value of the third strain gauge 131 of the first strain gauge in the first time period.

[0107] After obtaining the measurement results, the measurement results can be obtained from the test component 5, the radial vibration values ​​of the first strain gauge 111 and the second strain gauge 121 of the first strain gauge in the first time period are obtained, and the radial vibration mean of the first strain gauge 111 and the second strain gauge 121 of the first strain gauge in the first time period is determined, and the radial vibration mean represents the mean of the measurement results of the first strain gauge in the first time period.

[0108] After obtaining the measurement results, 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 axial strain mean value of the third strain gauge 131 of the first strain gauge in the first time period can be determined, and the axial strain mean value represents the mean value of the axial strain value in the first time period.

[0109] S320: When the ratio of the radial vibration value at the first moment to the radial vibration mean value is greater than a preset ratio, and when the ratio of the axial strain measurement value at the first moment to the axial strain mean value is greater than a preset ratio, the radial vibration value and the axial strain measurement value at the first moment are discarded.

[0110] After obtaining the measurement results, when the ratio of the radial vibration value at the first moment to the radial vibration mean is greater than the preset ratio, it means that the deviation between the radial vibration value at the first moment and the radial vibration mean is too large; when the ratio of the axial strain measurement value at the first moment to the axial strain mean is greater than the preset ratio, it means that the deviation between the axial strain measurement value at the first moment and the axial strain mean is too large, indicating that the radial vibration value and the axial strain measurement value of the rotating shaft at the first moment may fluctuate due to interference such as external collision, and the radial vibration value and the axial strain measurement value at the first moment can be discarded.

[0111] The beneficial effect brought about by the above-mentioned implementation method is that it can detect the fluctuations in the radial vibration value and axial strain measurement value of the rotating shaft caused by interference such as external collisions, and discard the radial vibration value and axial strain measurement value with excessive fluctuation amplitude caused by interference such as external collisions, thereby improving the measurement accuracy of the radial vibration value and the axial strain measurement value.

[0112] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A strain gauge for radial vibration and torque detection, characterized in that: include: A first substrate, on which a first strain gauge is packaged via a coating; A second substrate, on which a second strain gauge is packaged via a coating; a third substrate, on which a third strain gauge is packaged by a covering film, a connecting portion is provided on one side of the third substrate, a corner portion of the first substrate and the second substrate close to each other is connected to the connecting portion, and the first strain gauge, the second strain gauge and the third strain gauge all measure strain through a Wheatstone bridge; The support body includes a first support end, a second support end and a fixed plate, the first support end is used to cooperate with the rotating shaft, the second support end is used to support the fixed plate, the fixed plate is connected between the first support end and the second support end, the fixed plate is made of rigid material, the first substrate and the second substrate can be bent at the connecting part and attached to the fixed plate respectively, and the third substrate can 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.

2. The strain gauge according to claim 1, characterized in that The connecting portion is provided with a connection terminal, and the connection terminal is electrically connected to the first strain gauge, the second strain gauge and the third strain gauge respectively through circuits etched on the first substrate, the second substrate and the third substrate.

3. The strain gauge according to claim 2, characterized in that There are two support bodies, and the end of the first support end and the end of the second support end of each support body are transversely connected to a side wall of the fixed plate. The fixed plates of the two support bodies are fitted to each other, and a flexible positioning glue is provided between the fixed plates of the two support bodies.

4. The strain gauge according to claim 3, characterized in that The cross section of the first supporting end is in a curved shape, so that the first supporting end can cooperate with the outer side wall of the rotating shaft.

5. The strain gauge according to claim 4, characterized in that It also includes a fixing ring and a test assembly, wherein the fixing ring is arranged on the circumference of the rotating shaft, and a plurality of strain gauges are arranged between the fixing ring and the rotating shaft, wherein the first supporting ends of the two supporting bodies of each strain gauge are in contact with the rotating shaft, and the second supporting ends of the two supporting bodies of each strain gauge are in contact with the fixing ring; The test assembly is fixedly connected to the fixing ring, and the wiring terminals of each strain gauge are connected to the test assembly through cables.

6. The strain gauge according to claim 5, characterized in that The fixing ring includes two detachable ring bodies, and the two detachable ring bodies are connected to a plurality of strain gauges through a snap-fit ​​sleeve connection.

7. The strain gauge according to claim 6, characterized in that A plurality of dampers are arranged on the fixing ring along the circumference of the fixing ring.

8. A strain detection method, characterized in that: Using the strain gauge for radial vibration and torque detection according to any one of claims 1 to 7, the method comprises: The third substrate is attached to the rotating shaft, the first supporting end of the support body is abutted against the outer side wall of the rotating shaft, the first substrate is attached to the first side wall of the fixed plate, and the second substrate is attached to the second side wall of the fixed plate. The radial vibration of the rotating shaft is measured by the first strain gauge and the second strain gauge, and the axial strain of the rotating shaft is measured by the third strain gauge.

9. The strain detection method according to claim 8, characterized in that: The method further comprises: Attaching a flexible positioning adhesive between the fixing plates of the two supporting bodies, attaching the first substrate to the fixing plate of one supporting body, and attaching the second substrate to the fixing plate of the other supporting body; A fixing ring is sleeved on the circumference of the rotating shaft, and a plurality of strain gauges are arranged between the fixing ring and the rotating shaft, wherein the first supporting ends of the two supporting bodies of each strain gauge are in contact with the rotating shaft, and the second supporting ends of the two supporting bodies of each strain gauge are in contact with the fixing ring; The radial vibration of the rotating shaft is measured by the first strain gauge and the second strain gauge, and the axial strain of the rotating shaft is measured by the third strain gauge.

10. The strain detection method according to claim 9, characterized in that: The method further comprises: The test assembly is fixedly connected to the fixed ring, and the wiring terminals of each strain gauge are connected to the test assembly through cables. During the rotation of the shaft, the test data is stored by the test assembly. After the shaft stops rotating, the data in the test assembly is analyzed to obtain the test results.

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