Non-contact measuring device for testing strain signal of high-speed rotating shaft system

Abstract

The utility model relates to a non-contact measuring device for testing a strain signal of a high-speed rotating shaft system, belongs to the field of engineering testing, and particularly relates to the non-contact measuring device for testing the strain signal of the high-speed rotating shaft system. The utility model aims to solve the problems of easy fatigue and abrasion, poor anti-interference capability, large volume, installation limitation, signal-to-noise ratio and other adverse factors and insufficient stability of strain test in the traditional lap joint mode for measuring shafting strain. The device comprises a shaft system, a tool, a transmitting module, an induction coil, a pickup type induction head, a receiving unit and a strain gauge, the transmitting module is fixed on a shaft system through a tool; the strain gauge is pasted on the shaft system and is connected with the transmitting module; the induction coil is wound on the rotating shaft and is connected with the transmitting module; the pickup type inductive head supplies power to the induction coil through wireless induction, and the transmitting module is connected with the receiving unit through electric signals. The device is used for testing the strain signal of the high-speed rotating shaft system.

Description

TECHNICAL FIELD

[0001] The utility model belongs to engineering test field, concretely relates to a non -contact measuring device for high -speed rotating shaft system strain signal test. BACKGROUND

[0002] With the rapid development of rotating machinery such as gear box, diesel engine, large steam turbine generator unit, compressor, the requirement of shaft strain test in equipment operation is also increasingly improved.Especially the shaft system in high -speed rotating machinery is prone to the vibration of shaft system caused by misalignment, the decrease of dynamic balance precision and other reasons, and then the phenomenon of shaft strain increase leads to the overload of shaft system operation, which lightly influences normal operation of equipment, and seriously even can cause major safety accidents, and causes the huge loss of personnel and property.

[0003] In engineering, to solve this kind of vibration problem and ensure normal operation of equipment, the following methods are generally used: first, improve the alignment and balance precision of rotor, reduce vibration excitation, reduce the generation of vibration from the source;Second, increase the monitoring means of high-speed rotating shaft system operation, and the running condition of shaft system is monitored in real time through the method of shaft strain test, so that timely countermeasures are taken to reduce the adverse effects of increased shaft vibration.

[0004] Rotating machinery shaft system strain measurement usually uses current collector ring, and utilizes elastic force to lap, and rolling lap mode to form stable and reliable rotating communication system, and keeps the transmission path of electric signal under the rotation of shaft system uninterrupted.But this mode has many unfavorable factors such as easy fatigue wear, poor anti-interference ability, large volume, installation restriction, signal-to-noise ratio, and the stability of strain test is insufficient. INVENTION CONTENTS

[0005] The utility model provides a non -contact measuring device for high -speed rotating shaft system strain signal test in view of the problems of easy fatigue wear, poor anti-interference ability, large volume, installation restriction, signal-to-noise ratio and the insufficient stability of strain test of traditional lap mode measurement shaft system strain.

[0006] The utility model discloses a non -contact measuring device for high -speed rotating shaft system strain signal test, which comprises a shaft system, a tool, a transmitting module, an induction coil, a pickup type induction head, a receiving unit and a strain gauge.

[0007] The utility model has the advantages of:

[0008] The utility model is provided with an acquisition module, a wireless power supply module, an induction antenna ring, and a signal decoder. Since the acquisition module can be wirelessly powered, the receiving coil is smaller in shape and lighter in weight than a battery. Since there is no mechanical overlap in the transmission of the measurement signal, the reliability of the signal transmission is improved. Placing the signal conditioning module in front is beneficial to improving the signal-to-noise ratio. Since the weight of the signal transmission module on the rotor can be less than 14 grams, it can further adapt to installation restrictions and match harsh installation conditions. The light weight of the transmission module allows for strain measurement of high-speed shaft systems, and the maximum speed of the shaft system can be as high as 6000rpm. The utility model integrates signal acquisition, module induction power supply, wireless transmission of test signals, and signal analysis, providing an excellent method for high-speed rotating shaft system strain testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 Schematic diagram of the structure of a non-contact measurement device for strain signal testing of high-speed rotating shaft systems. DETAILED DESCRIPTION

[0010] The technical solution of the present utility model is not limited to the specific implementation methods listed below, but also includes any combination of the specific implementation methods.

[0011] Specific embodiment 1: This embodiment is described in conjunction with the accompanying drawings. In this embodiment, a non-contact measurement device for high-speed rotating shaft strain signal testing includes a shaft system 1, a tooling 2, a transmitting module 3, an induction coil 4, a pickup-type induction head 5, a receiving unit 6 and a strain gauge 7; the transmitting module 3 is fixed to the shaft system 1 through the tooling 2; the strain gauge 7 is pasted on the shaft system 1 and connected to the transmitting module 3; the induction coil 4 is wound around the rotating shaft and connected to the transmitting module 3; the pickup-type induction head 5 supplies power to the induction coil 4 through wireless induction, and the transmitting module 3 and the receiving unit 6 are linked by electrical signals.

[0012] The high-speed modular multi-channel telemetry system in this embodiment can be adapted to most strain sensors. The transmitter module is small in size and light in weight. Various different fixed fixtures can be flexibly customized according to the application scenario. It is installed on the rotating shaft to be measured through the fixture, which is easy to install. At the same time, it can withstand large centrifugal forces and can be powered by induction. If it is battery-powered, the battery can be installed in a fully encapsulated shell or a half shell to facilitate on-site installation. If it is inductively powered, the annular stator provides a contactless energy supply for the transmitter through inductive coupling: the alternating magnetic field of the stator ring induces a voltage in the secondary coil on the device. The induced voltage is used to power the transmitter unit. The uniqueness of the telemetry system is that it can be one-to-many, and one receiver can receive signal data measured by four transmitter modules at the same time. Moreover, test measurements can be performed at any time and under any conditions (rain, snow, high temperature, etc.).

[0013] Specific embodiment 2: This embodiment differs from specific embodiment 1 in that the mechanical strain acquired by the strain gauge 7 is converted into a digitized strain signal and transmitted to the receiving unit 6. Other aspects are the same as specific embodiment 1.

[0014] Specific embodiment three: This embodiment differs from specific embodiment one in that the data received by the receiving unit 6 is transmitted to the host computer, which processes the data to obtain shaft strain data, and determines the health status of the shaft operation based on the strain data. Other aspects are the same as specific embodiment one.

[0015] The transmitter module 3 is purchased from outside, model KMT T1-PCM-STG, and weighs less than 14g.

[0016] The induction coil is wound as densely as possible around the shaft being measured. As long as the power supply is sufficient, there is no requirement for the number of turns. The power supply efficiency is closely related to the number of winding turns, and the power conversion efficiency is about 10%-20%.

[0017] The pickup sensor head 5 contains an AC power converter. The power adapter converts AC power to DC power, which is then supplied to the pickup sensor head 5. The AC power converter then converts DC power to 30 kHz AC power. The induction coil rotates along the shaft being measured, cutting through magnetic lines of force to generate an alternating current, which powers the transmitter module. The denser the coil winding, the greater the power supply.

[0018] The receiving unit 6 is a purchased product, model KMT CP16.

[0019] If the shafting system to be measured is large, the transmitter module 3 can be directly glued to the shafting system to be measured. If the shafting system to be measured is small, a custom tool 2 is required. The tool 2 is clamped to the shafting system to be measured using a disc and screws, and the transmitter module 3 is then glued to the tool 2.

Claims

1. A non-contact measuring device for high-speed rotating shaft strain signal testing, characterized in that A non-contact measurement device for strain signal testing of a high-speed rotating shaft system comprises a shaft system (1), a tool (2), a transmitting module (3), an induction coil (4), a pickup-type induction head (5), a receiving unit (6), and a strain gauge (7); the transmitting module (3) is fixed to the shaft system (1) through the tool (2); the strain gauge (7) is adhered to the shaft system (1) and connected to the transmitting module (3); the induction coil (4) is wound around the rotating shaft and connected to the transmitting module (3); the pickup-type induction head (5) supplies power to the induction coil (4) through wireless induction, and the transmitting module (3) and the receiving unit (6) are linked through electrical signals.

2. A non-contact measuring device for high-speed rotating shaft strain signal testing according to claim 1, characterized in that The mechanical strain acquired by the strain gauge (7) is converted into a digitized strain signal and transmitted to the receiving unit (6).

3. The non-contact measurement device for high-speed rotating shaft strain signal testing according to claim 1, characterized in that The data received by the receiving unit (6) is transmitted to a host computer, and after being processed by the host computer, shaft system strain data is obtained, and the health status of the shaft system operation is judged according to the size of the strain data.

4. The non-contact measurement device for high-speed rotating shaft strain signal testing according to claim 1, characterized in that The transmitting module (3) weighs less than 14g.

5. The non-contact measurement device for high-speed rotating shaft strain signal testing according to claim 1, characterized in that The tooling (2) is clamped on the shaft system to be measured via discs and screws, and the transmitting module (3) is bonded to the tooling (2).

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