Detachable non-contact strain wireless measurement device and method for cylindrical component

Abstract

The invention relates to the technical field of sensors, and provides a detachable non-contact strain wireless measurement device and method for a cylindrical component. The device comprises a test beam, a strain sensor arranged on the test beam, a circuit module arranged on one side of the test beam and a clamp arranged on the other side of the test beam and used for fixing a to-be-tested cylindrical component, and a gasket is arranged between the test beam and the circuit module. The test beam can vibrate along with the to-be-tested cylindrical component and collect a vibration signal through the strain sensor; and the strain sensor is in signal connection with the circuit module. According to the invention, the strain sensor is fixed on the test beam and is not in contact with the to-be-tested member, and the stress strain condition of the to-be-tested cylindrical member is indirectly obtained by collecting the vibration signal on the test beam. Compared with traditional strain measurement, the strain measurement device has the advantages of being convenient to install, capable of being rapidly disassembled and repeatedly used, and free of additional operation such as pretreatment of the to-be-measured component.

Description

Technical Field

[0001] The present invention relates to the field of sensor technology, and in particular to a detachable non-contact strain wireless measuring device and method for a cylindrical component. Background Art

[0002] The hydraulic system plays an extremely critical role in the safe and normal operation of equipment and ensuring the design performance. Especially in the maintenance of large equipment, most hydraulic pipeline failures are caused by abnormal vibration. Therefore, the vibration stress monitoring and analysis of power hydraulic pipelines are particularly important to avoid sudden catastrophic accidents caused by structural failure, reduce maintenance costs, and extend service life. To measure the stress and strain of the pipeline, the most widely used choice is to use strain electrical measurement method.

[0003] The strain electrical measurement method is to fix the resistance strain gauge on the part to be tested of the test component. The resistance strain gauge made based on the pressure-variable effect can change its own resistance value according to the mechanical deformation of the measured component under the action of external force, output voltage changes through the Wheatstone bridge, and finally analyze the voltage changes to convert them into the stress value of the measured point.

[0004] In the maintenance of large equipment, there are many hydraulic pipelines, which are widely distributed and complex in structure. The traditional wired strain test system needs to paste strain gauges at each test point, wait for curing, and then connect the wires to the acquisition equipment. If the paste is not firm or there is damage, the process needs to be repeated. Under the measurement workload of hundreds of test points, the whole set of operations has low efficiency, high labor intensity, and is very time-consuming. In addition, due to the large number of test points, there are also many connecting wires between strain gauges and acquisition equipment. In addition to the high construction cost, the current complex software and hardware support has high power consumption. Once there is a problem with individual wiring or sensors, it is difficult to sort out and troubleshoot. Therefore, it is of great significance to establish an easy-to-use, low-cost strain measurement technology. Summary of the invention

[0005] In view of the defects in the prior art, an object of the present invention is to provide a detachable non-contact strain wireless measurement device and method for cylindrical components.

[0006] According to the present invention, a detachable non-contact strain wireless measuring device for a cylindrical member includes a test beam, a strain sensor arranged on the test beam, a circuit module arranged on one side of the test beam, and a fixture arranged on the other side of the test beam and used to fix the cylindrical member to be tested, wherein a gasket is provided between the test beam and the circuit module, and the test beam can follow the vibration of the cylindrical member to be tested and collect vibration signals through the strain sensor;

[0007] The strain sensor signal is connected to the circuit module.

[0008] Preferably, the gaskets are arranged vertically and both ends are coated with protective glue.

[0009] Preferably, the test beam has a certain curvature in the direction toward the cylindrical component to be tested.

[0010] Preferably, the test beam is made of a metal material with a certain elasticity.

[0011] Preferably, the circuit module includes a collection module, a filtering module, an amplification module, and a wireless transmission module which are connected in sequence, and the wireless transmission module is communicatively connected to the terminal, wherein the wireless transmission module can adopt at least one of Bluetooth, WiFi, and ZigBee.

[0012] Preferably, the test beam and the circuit module can share a set of fixtures or be fixed at different positions of the cylindrical component to be tested using different fixtures.

[0013] Preferably, the clamp comprises a first clamping end detachably fixed to the test beam and a second clamping end detachably connected to the first clamping end.

[0014] Preferably, the first clamping end, the second clamping end and the cylindrical member to be measured are in line contact or surface contact.

[0015] Preferably, the strain sensor is arranged at the center of the test beam.

[0016] According to the present invention, a detachable non-contact strain wireless measurement method for a cylindrical component comprises the following steps:

[0017] Step 1, selecting a corresponding strain sensor according to measurement requirements, and fixing the strain sensor on a test beam;

[0018] Step 2, assemble the fixture and connect it to the test beam;

[0019] Step 3, installing the circuit module and the test beam on the fixture;

[0020] Step 4, connecting the strain sensor to the circuit module, the circuit module is connected to the terminal for communication, and measurement begins.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention fixes the strain sensor on the test beam without contact with the component to be tested. By collecting the vibration signal on the test beam, the frequency response function principle and the dynamic characteristics of the component to be tested are used to reconstruct the vibration signal transmitted from the component to be tested to the measuring beam, and indirectly obtain the stress and strain conditions of the cylindrical component to be tested. Compared with the traditional strain measurement in which the sensor is directly fixed on the part to be tested, which takes a lot of time in the pasting and subsequent disassembly, the present invention is easy to install, can be quickly disassembled, and reused, and does not require additional operations such as pre-treatment of the component to be tested, and the sensor is non-contact with the component to be tested.

[0023] 2. In the present invention, the sensor is fixed on the test beam, and the operation of disassembling the sensor is eliminated in the overall operation process. In addition to avoiding damage to the sensor due to operational errors, it also saves corresponding costs and time.

[0024] 3. The signal transmission between the test device and the terminal is carried out by wireless transmission. Compared with the traditional strain measurement method, it solves the problem of complicated and messy wiring. The wireless transmission method reduces the construction cost and makes the problem sorting and troubleshooting work more convenient.

[0025] 4. The present invention adopts wireless transmission, and the terminal does not need to be placed near the measuring device. The user can monitor the stress and strain changes of the cylindrical component in real time at a long distance, reducing the impact of the on-site test environment on the user.

[0026] 5. The design of the test beam of the present invention refers to the structural dynamic characteristics of the component to be tested, has a certain curvature, and can control the measuring device to respond to the strain of the cylindrical component to be tested in a stable state.

[0027] 6. The fixture of the test beam of the present invention is in line contact with the cylindrical component to be measured, which can reduce the influence of the measuring device on the frequency response characteristics such as the characteristic frequency and vibration mode of the cylindrical component to be measured. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0029] Figure 1 It is a schematic diagram of the overall structure of one direction of the present invention;

[0030] Figure 2 It is a schematic diagram of the overall structure of another direction of the present invention;

[0031] Figure 3 is a front view of the test beam of the present invention;

[0032] Figure 4 is a side view of the test beam of the present invention;

[0033] Figure 5 It is a structural schematic diagram of the installation position of the strain sensor on the test beam;

[0034] Figure 6 It is a schematic diagram of the structure of the present invention in use state.

[0035] The figure shows:

[0036] Fixture 1

[0037] Test beam 2

[0038] Circuit module 3

[0039] Strain Sensor 4

[0040] Gasket 5

[0041] Cylindrical component to be tested 6

[0042] First clamping end 101

[0043] The second clamping end 102 DETAILED DESCRIPTION

[0044] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0045] Embodiment 1:

[0046] The present invention provides a detachable non-contact strain wireless measuring device for cylindrical components, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, it includes a test beam 2, a strain sensor 4 arranged on the test beam 2, a circuit module 3 arranged on one side of the test beam 2, and a fixture 1 arranged on the other side of the test beam 2 and used to fix the cylindrical component 6 to be tested, a gasket 5 is provided between the test beam 2 and the circuit module 3, and the test beam 2 can vibrate along with the cylindrical component 6 to be tested and collect vibration signals through the strain sensor 4;

[0047] The signal of the strain sensor 4 is connected to the circuit module 3. The strain sensor 4 has no contact with the cylindrical component 6 to be tested. The strain sensor 4 analyzes and restores the pipeline vibration signal after preprocessing the signal measured on the test beam 2 by the circuit module 3, and communicates with the terminal through wireless transmission.

[0048] The gasket 5 is arranged vertically and coated with protective glue at both ends, which can protect the circuit module 3, reduce the mutual influence between the circuit module 3 and the test beam 2, and extend the service life of the equipment. The protective glue can also absorb prestress and assembly stress, and reduce the influence of other factors on the measurement.

[0049] The test beam 2 is preferably made of a metal material with a certain elasticity, such as stainless steel. The test beam 2 is structurally designed to have a certain curvature in the direction of the cylindrical component 6 to be tested, ensuring that the test beam 2 is always in a stable state and vibrates at the same frequency as the cylindrical component 6 to be tested, and quickly responds to the stress and strain changes of the cylindrical component 6 to be tested. At the same time, the strain sensor 4 is arranged at the center of the test beam 2 to measure the vibration signal, so that the signal collection is more accurate. The strain sensor 4 inputs the collected strain information into the circuit module 3 for processing.

[0050] The fixture 1 includes a first clamping end 101 detachably fixed on the test beam 2 and a second clamping end 102 detachably connected to the first clamping end 101. The first clamping end 101 and the second clamping end 102 are connected together to firmly fix the cylindrical component 6 to be tested. The first clamping end 101 and the second clamping end 102 preferably adopt a semicircular structure to achieve stable clamping of the cylindrical component 6 to be tested. In actual applications, the first clamping end 101 and the second clamping end 102 are in line contact or surface contact with the cylindrical component 6 to be tested.

[0051] The present invention also provides a detachable non-contact strain wireless measurement method for a cylindrical member, which is preferably performed using the detachable non-contact strain wireless measurement device for a cylindrical member in the present invention, comprising the following steps:

[0052] Step 1, selecting a corresponding strain sensor 4 according to measurement requirements, and fixing the strain sensor 4 on the test beam 2;

[0053] Step 2, assembling the fixture 1 and connecting it to the test beam 2;

[0054] Step 3, installing the circuit module 3 and the test beam 2 on the fixture 1;

[0055] Step 4, connect the strain sensor 4 to the circuit module 3, the circuit module 3 is connected to the terminal for communication, and the measurement starts.

[0056] Embodiment 2:

[0057] This embodiment is a preferred example of Embodiment 1.

[0058] In this embodiment, the test beam 2 and the circuit module 3 share a set of fixtures 1. The circuit module 3 includes an acquisition module, a filtering module, an amplification module, and a wireless transmission module which are connected in sequence. The wireless transmission module is connected to the terminal for communication. The wireless transmission module can adopt at least one of Bluetooth, WiFi, and ZigBee. The transmission method used will have a certain impact on the chip, circuit design, and module size of the circuit module 3. It should be flexibly designed according to the actual application scenario to meet the needs of the product.

[0059] When in use, the strain sensor 4 fixed on the test beam 2 is connected to the reserved interface of the circuit module 3 through a wire, and the circuit module 3 communicates with the terminal through wireless transmission; when the test beam 2 and the circuit module 3 use the same set of fixtures 1, a gasket 5 is required in the middle to ensure that the test beam 2 and the fixture 1 can be tightly connected. At the same time, the circuit module 3 also needs protective glue at both ends of the gasket 5 to reduce stress transfer, protect the circuit stability, and extend its own service life.

[0060] The strain sensor 4 collects strain signals on the test beam 2, and converts them into digital signals after preprocessing through the circuit module 3; after sending them to the terminal through wireless transmission, the terminal processes the data to obtain the strain value of the test beam 2, and finally uses the frequency response function principle to convert the actual strain value of the test part set on the cylindrical component 6 to the test part according to the mathematical calculation model established according to the strain proportional relationship between the test beam 2 and the test part.

[0061] Embodiment 3:

[0062] This embodiment is a variation of Embodiment 1.

[0063] In this embodiment, the test beam 2 and the circuit module 3 are installed separately, that is, the test beam 2 and the circuit module 3 are fixed at different positions of the cylindrical component 6 to be measured by different clamps 1 respectively. Although the installation method in this embodiment increases the number of clamps 1, it also increases the installation range of the device, and the circuit module 3 can be installed in a place with more space.

[0064] The measuring principle of the present invention is as follows:

[0065] First, the corresponding strain sensor 4 is selected according to the measurement requirements, and the strain sensor 4 is cured on the test beam 2. The curing of the strain sensor 4 can be carried out according to the conventional strain gauge curing procedure, such as pressurization, curing, stabilization and sealing protection. After the strain sensor 4 is installed at the center position of the test beam 2 according to the above procedure, there is no need to adjust the strain sensor 4 when testing other identical components in the subsequent test.

[0066] Secondly, the fixture 1 is assembled and connected to the cylindrical component 6 to be tested, wherein the assembly of the fixture 1 is to connect the first clamping end 101 and the second clamping end 102 to form a whole, and the connection with the cylindrical component 6 to be tested needs to be fixed to the tested part of the cylindrical component 6 to be tested by the fastener of the second clamping end 102. The contact area between the fixture 1 and the cylindrical component 6 to be tested is small, and the fixture 1 is not affected by the rough surface or oil stains of the cylindrical component 6 to be tested, and no pretreatment and additional operation of the cylindrical component 6 to be tested are required.

[0067] Again, the circuit module 3 and the test beam 2 are installed on the fixture 1. Specifically, the circuit module 3 and the test beam 2 are arranged vertically, and the intermediate spacer 5 is fixed on the first clamping end 101 of the fixture 1. It should be noted that the use of the spacer 5, in addition to ensuring that the test beam 2 can be completely attached to the first clamping end 101, also requires the use of protective glue to absorb the prestress and assembly stress, while reducing the mutual influence between the circuit module 3 and the test beam 2. In addition, the preferred connection method is an integrated installation, that is, the test beam 2 and the circuit module 3 share a set of fixtures 1, and the integrated installation has a small overall volume and occupies less space.

[0068] Finally, the strain sensor 4 is connected to the circuit module 3, and the circuit module 3 is connected to the terminal for communication, and the measurement is started. The strain sensor 4 is connected to the circuit module 3 by wire, and the circuit module 3 is connected to the terminal by wireless transmission. In this step, the strain sensor 4 will sense the deformation of the test beam 2, convert the measured strain signal into a resistance change, pre-process the signal in the circuit module 3 through the wire, and after pre-processing operations such as filtering, amplification, and conversion, the digital signal is wirelessly transmitted to the terminal for processing. After the terminal performs data processing such as noise reduction and analysis on the data obtained by wireless transmission, the strain value of the test beam 2 can be obtained, and the real strain value of the corresponding cylindrical component 6 to be measured can be converted according to the strain mapping relationship between the calibrated test beam 2 and the part to be measured.

[0069] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element 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.

[0070] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A detachable non-contact strain wireless measuring device for cylindrical components, characterized in that: The invention comprises a test beam (2), a strain sensor (4) arranged on the test beam (2), a circuit module (3) arranged on one side of the test beam (2), and a fixture (1) arranged on the other side of the test beam (2) and used to fix a cylindrical component (6) to be tested, wherein a gasket (5) is provided between the test beam (2) and the circuit module (3), the test beam (2) can follow the vibration of the cylindrical component (6) to be tested and collect vibration signals through the strain sensor (4); and the signal of the strain sensor (4) is connected to the circuit module (3).

2. The detachable non-contact strain wireless measuring device for cylindrical components according to claim 1, characterized in that: The gaskets (5) are arranged vertically and both ends are coated with protective glue.

3. The detachable non-contact strain wireless measuring device for cylindrical components according to claim 1, characterized in that: The test beam (2) has a certain curvature in the direction toward the cylindrical component (6) to be tested.

4. The detachable non-contact strain wireless measuring device for cylindrical components according to claim 1, characterized in that: The test beam (2) is made of a metal material with a certain elasticity.

5. The detachable non-contact strain wireless measuring device for cylindrical components according to claim 1, characterized in that: The circuit module (3) comprises a collection module, a filtering module, an amplification module, and a wireless transmission module which are connected in sequence. The wireless transmission module is communicatively connected to the terminal, wherein the wireless transmission module can adopt at least one of Bluetooth, WiFi, and ZigBee.

6. The detachable non-contact strain wireless measuring device for cylindrical components according to claim 1, characterized in that: The test beam (2) and the circuit module (3) can share a set of fixtures (1) or be fixed at different positions of the cylindrical component (6) to be tested using different fixtures (1).

7. The detachable non-contact strain wireless measuring device for cylindrical components according to claim 1, characterized in that: The clamp (1) comprises a first clamping end (101) detachably fixed to the test beam (2) and a second clamping end (102) detachably connected to the first clamping end (101).

8. The detachable non-contact strain wireless measuring device for cylindrical components according to claim 7, characterized in that: The first clamping end (101), the second clamping end (102) and the cylindrical component (6) to be measured are both in line contact or surface contact.

9. The detachable non-contact strain wireless measuring device for cylindrical components according to claim 1, characterized in that: The strain sensor (4) is arranged at the center of the test beam (2).

10. A detachable non-contact strain wireless measurement method for cylindrical components, characterized in that: The following steps are included: Step 1, selecting a corresponding strain sensor (4) according to measurement requirements, and fixing the strain sensor (4) on a test beam (2); Step 2, assembling the fixture (1) and connecting it to the test beam (2); Step 3, installing the circuit module (3) and the test beam (2) on the fixture (1); Step 4, connecting the strain sensor (4) to the circuit module (3), the circuit module (3) is connected to the terminal for communication, and measurement is started.

Images