Method for testing stress of slewing bearing retainer

Abstract

The invention provides a slewing bearing retainer stress testing method which comprises the following steps: step 1, arranging at least one sensing element on a frame of a slewing bearing retainer to acquire a physical signal of the retainer in a stress state; 2, a signal processing unit connected with the sensing element is arranged in a pocket hole, away from the sensing element, of the retainer, and the collected physical signals are processed to extract effective information reflecting the stress state of the retainer; 3, sending the processed information to a receiving end through a transmission module; according to the invention, the stress signal of the retainer in a working state can be acquired in real time through the sensing element, and is quickly transmitted to the data terminal for analysis through a wireless transmission technology, so that the system has high sensitivity, high reliability and wide applicability, and provides accurate support for design optimization and fault diagnosis of the retainer.

Description

Technical Field

[0001] The invention belongs to the technical field of force detection of a slewing bearing retainer, and in particular relates to a method for testing the force of a slewing bearing retainer. Background Art

[0002] In commonly used cylindrical roller bearings, the retainer constrains the position of the rollers and ensures that the rollers rotate normally along the raceway. Due to slight differences in the running postures of the rollers, there will be differences in the speed and direction of movement between the front and rear rollers, which will bring uncertain tensile and compressive loads to the retainer. In the prior art, the stress state test of the retainer usually relies on static simulation and loading tests in laboratory environments, which is difficult to accurately reflect the load distribution of the equipment under actual working conditions. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a method for testing the force of a slewing bearing cage, which can collect the force signal of the cage in a working state in real time through a sensing element, and quickly transmit it to a data terminal for analysis through wireless transmission technology. It has high sensitivity, high reliability and wide applicability, and provides accurate support for cage design optimization and fault diagnosis.

[0004] The technical solution adopted by the present invention is: a method for testing the force of a slewing bearing cage, comprising the following steps: Step 1: at least one sensing element is arranged on the frame of the slewing bearing cage to collect physical signals of the cage under stress; Step 2: a signal processing unit connected to the sensing element is arranged in a pocket of the cage far away from the sensing element, and the collected physical signal is processed to extract effective information reflecting the stress state of the cage; Step 3: Send the processed information to the receiving end through the transmission module; Step 4: Parse and analyze the information at the receiving end to obtain the stress state of the retaining frame.

[0005] The sensing element is a strain gauge, which is used to sense the strain signal of the cage.

[0006] The signal processing includes signal amplification processing and filtering processing. The amplification processing is implemented by an instrument amplifier, and the filtering processing is implemented by a low-pass filtering circuit.

[0007] The transmission module is a wireless transmission module.

[0008] The receiving end includes a wireless signal receiving module and a data processing module, which are used to parse and analyze the received information.

[0009] The physical signals include strain signals, temperature signals and posture signals.

[0010] The device also includes a power supply module, which is arranged together with the signal processing unit in the same pocket of the retaining frame to provide a stable operating voltage to support the operation of the sensing element, the signal processing unit and the transmission module.

[0011] The beneficial effects of the present invention are: The present invention can collect the force signals of the cage in the working state in real time through the sensing element, and quickly transmit them to the data terminal for analysis through wireless transmission technology. It has high sensitivity, high reliability and wide applicability, and provides accurate support for cage design optimization and fault diagnosis. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural diagram of the present invention; Figure 2 This is the circuit diagram of the strain bridge of the present invention; Figure 3 This is the strain signal amplification and conditioning and temperature measurement circuit diagram of the present invention; Figure 4 This is the AD acquisition and CPU encoding wireless transmission circuit diagram of the present invention.

[0013] Markings in the figure: 1. Cage; 2. Power supply module; 3. Signal processing unit; 4. Wireless transmission module; 5. Strain gauge. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] As shown in the figure, a method for testing the force of a slewing bearing cage includes the following steps: Step 1: at least one sensing element is arranged on the frame of the slewing support retainer 1 to collect the physical signal of the retainer 1 under stress. Specifically, the sensing element is a strain gauge 5, which is used to sense the strain signal of the retainer 1. In addition, the sensing element can also be a temperature sensor and a posture sensor. The strain gauge 5 can sense the strain signal generated by the external force, and usually uses a Wheatstone bridge circuit to accurately measure the resistance change, thereby indirectly reflecting the stress state of the retainer 1. Since temperature changes may also affect the accuracy of the strain signal, a temperature sensor is used to monitor the temperature in real time to ensure the accuracy of the test. The posture sensor can be used to monitor the posture changes of the slewing support retainer 1 to further improve the integrity and accuracy of the data.

[0016] Among them, the cage 1 of the slewing support can be an annular integral structure or a segmented structure. In this example, the cage 1 is a segmented structure, and there are three pockets in the cage 1, which can hold three rollers during operation. In this example, in order to more completely reflect the force condition and force relationship of the frame of the cage 1, four strain gauges 5 are arranged at the frame of the cage 1, and the four strain gauges 5 are installed at the frame of the cage 1 by pasting. In addition, different numbers of strain gauges 5 can be set according to actual conditions.

[0017] Step 2: A signal processing unit 3 connected to the sensing element is arranged in the pocket of the retaining frame 1 far away from the sensing element, and signal processing is performed on the collected physical signal to extract effective information reflecting the stress state of the retaining frame 1; the signal processing unit 3 mainly includes a signal collection and amplification module. More specifically, the signal processing includes signal amplification processing and filtering processing. The amplification processing is implemented by an instrument amplifier, and its gain is set by an externally connected resistor to meet the amplification requirements of different strain signals. The filtering processing is implemented by a low-pass filtering circuit, and the cut-off frequency of the filter is set according to the actual operating frequency range of the retaining frame 1.

[0018] In this example, the collected raw signal is first differentially amplified by an instrumentation amplifier (e.g., INA333). The instrumentation amplifier can effectively increase the amplitude of the signal while reducing the influence of noise. The gain value is adjusted according to the sensitivity of the strain gauge 5, making the signal more readable in subsequent processing.

[0019] Since there may be noise signals from power supplies, electrical equipment or other sensors in the test environment, the signal is filtered through a low-pass filter to remove high-frequency noise components and retain useful low-frequency information. This step is crucial to improving the accuracy and stability of the data.

[0020] Through the above processing, the amplitude of the signal is significantly improved, and the noise interference is removed, ensuring the accuracy of subsequent processing steps.

[0021] The relevant modules of the signal processing unit 3 are arranged at a pocket position away from the sensing element, so as to avoid the absence of rollers in the pocket and affect the normal operation of the sensing element, thereby reducing the impact on the final test result.

[0022] Step three: Send the processed information to the receiving end through the transmission module; specifically, first use the analog-to-digital conversion module to convert the analog signal into a digital signal, and then send it to the receiving end through the transmission module.

[0023] The transmission module is a wireless transmission module 4, specifically a Bluetooth communication module, which adopts a low-power Bluetooth (BLE) protocol, has a periodic signal sending function, and can optimize the signal transmission range and quality through an external antenna.

[0024] The operating frequency of the Bluetooth module is usually 2.4 GHz, which uses frequency division multiplexing technology to avoid interference between multiple devices. The signal of each device is modulated and transmitted independently, ensuring stability when multiple devices coexist.

[0025] Step 4: Parse and analyze the information at the receiving end to obtain the stress state of the cage 1. At the receiving end, the Bluetooth receiving module receives the wireless signal and transmits it to the data processing module. The receiving end is usually composed of a computer, an embedded device or a dedicated monitoring terminal, which will parse and process the received data and finally obtain the stress state of the cage 1.

[0026] The receiving end includes a wireless signal receiving module and a data processing module, which are used to parse and analyze the received information, wherein the data processing module is responsible for demodulating the signal and performing signal analysis. Through the built-in algorithm, the module can calculate key parameters such as the force magnitude, force distribution, and load direction of the cage 1 in the working state. The module can also further combine temperature and posture data to optimize the force analysis results and provide more accurate and comprehensive force information.

[0027] The output results of the data processing module are displayed to the user through a display, chart or other forms, so that the operator can timely understand the stress state of the cage 1. This information can be displayed in real time on the monitoring terminal to provide decision support for engineers to determine whether maintenance or adjustment is needed.

[0028] In addition to real-time data display, the receiving end can also perform data storage and analysis to track the usage and force changes of the retainer 1, predict possible failure points, and provide data support for subsequent design optimization or equipment maintenance.

[0029] The physical signals include strain signals, temperature signals and attitude signals, wherein the ambient temperature signal is collected by a reference voltage source provided by a precision reference diode, and temperature compensation is achieved through a voltage divider resistor; the attitude signal is collected by a three-axis attitude sensor, which is integrated in the Bluetooth chip and is collected and transmitted synchronously with the strain signal and the temperature signal.

[0030] It also includes a power supply module 2, which is arranged together with the signal processing unit 3 in the same pocket of the holder 1 to provide a stable working voltage to support the operation of the sensing element, the signal processing unit 3 and the transmission module. Specifically, the power supply module 2 includes a battery and a power management chip, which is responsible for converting the battery voltage into a +2.5V working voltage to power the amplifier, the Bluetooth module and the analog-to-digital conversion module.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for testing the force of a slewing bearing cage, characterized in that: The following steps are involved: Step 1: at least one sensing element is arranged on the frame of the slewing bearing cage to collect physical signals of the cage under stress; Step 2: a signal processing unit connected to the sensing element is arranged in a pocket of the cage far away from the sensing element, and the collected physical signal is processed to extract effective information reflecting the stress state of the cage; Step 3: Send the processed information to the receiving end through the transmission module; Step 4: Parse and analyze the information at the receiving end to obtain the stress state of the retaining frame.

2. A method for testing the force of a slewing bearing cage according to claim 1, characterized in that: The sensing element is a strain gauge, which is used to sense the strain signal of the cage.

3. A method for testing the force of a slewing bearing cage according to claim 1, characterized in that: Signal processing includes signal amplification and filtering. The amplification is achieved through an instrument amplifier, and the filtering is achieved through a low-pass filter circuit.

4. A method for testing the force of a slewing bearing cage according to claim 1, characterized in that: The transmission module is a wireless transmission module.

5. A method for testing the force of a slewing bearing cage according to claim 1, characterized in that: The receiving end includes a wireless signal receiving module and a data processing module, which are used to parse and analyze the received information.

6. A method for testing the force of a slewing bearing cage according to claim 1, characterized in that: Physical signals include strain signals, temperature signals and posture signals.

7. A method for testing the force of a slewing bearing cage according to claim 1, characterized in that: It also includes a power supply module, which is arranged together with the signal processing unit in the same pocket of the retaining frame to provide a stable operating voltage to support the operation of the sensing element, the signal processing unit and the transmission module.

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