Bearing life test device for ct-x-ray tube

Abstract

The application discloses a CT-X ray tube bearing life test device, which comprises a test table and a tool seat, the tool seat is connected with a vacuum quartz glass cover, a test cavity is formed in the vacuum quartz glass cover, the test cavity is provided with a bearing to be tested, a rotor copper sleeve used for cooperating with the bearing to be tested and a target disc used for cooperating with the rotor copper sleeve, the tool seat is provided with a heating structure used for heating the target disc through the Joule effect and a driving structure used for driving the bearing to be tested to rotate through the electromagnetic induction principle to simulate the actual operation condition of the bearing, the test table is provided with a vacuum pumping structure used for pumping out the air in the test cavity to simulate the vacuum environment when the bearing is actually operated, and the tool seat is provided with a detection structure used for monitoring the rotating speed of the bearing and the temperature of the target disc. The application solves the problem that the prior art lacks a special life test device capable of simulating the vacuum, high temperature and electromagnetic driving rotating condition of the actual work of the CT-X ray tube bearing.

Description

Technical Field

[0001] This invention relates to the field of bearing testing equipment technology, specifically a CT-X-ray tube bearing life testing device. Background Technology

[0002] Computed tomography (CT) machines are indispensable core medical equipment in clinical medical diagnosis, widely used for imaging examinations of various organs in the human body. Their operational stability and detection accuracy directly affect the accuracy of clinical diagnostic results. Among these components, the CT-X-ray tube bearing, as a key core component of the CT tube assembly, undertakes the core function of rotational drive. Its service life directly determines the overall service life of the CT machine, and its rotational performance directly affects the working stability of the X-ray tube, thus having a critical impact on the detection accuracy of the CT machine. Therefore, the quality and performance verification of the CT-X-ray tube bearing is a crucial step in CT machine production and the testing of its supporting components.

[0003] Currently, industry monitoring of CT-X-ray tube bearing performance and lifespan is only achieved indirectly by collecting and analyzing vibration and noise signals from the bearings during the actual operation of the CT machine. This method cannot perform pre-testing and lifespan verification at the bearing manufacturing stage. If a CT-X-ray tube bearing malfunctions due to its own quality issues during use, the entire CT machine must be shut down for repair. This not only disrupts medical diagnostic work but also incurs high equipment repair and downtime costs, causing significant economic losses and operational disruptions for medical institutions.

[0004] Meanwhile, the actual working conditions of CT-X-ray tube bearings are significantly unique. They require high-speed rotation of 3000~10800 rpm via electromagnetic drive in a high-vacuum environment and a high-temperature radiation environment of around 1300℃. Conventional bearing life testing equipment cannot simulate this complex and demanding specific working condition, nor can it match the coordinated working requirements of vacuum, high temperature, and electromagnetic drive. Furthermore, at present, China has not yet developed a dedicated life testing device capable of simulating the actual working conditions of CT-X-ray tube bearings. The lack of an effective means to conduct pre-shipment condition simulation life verification for such bearings prevents the avoidance of subsequent usage risks caused by bearing quality problems from the source, becoming a technical bottleneck restricting the quality control of CT machine components and the development of the industry. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a CT-X-ray tube bearing life testing device, which solves the problem of the lack of a dedicated life testing device in the existing technology that can simulate the vacuum, high temperature, and electromagnetic drive rotation conditions of actual CT-X-ray tube bearing operation.

[0006] To achieve the above objectives, the present invention provides a CT-X-ray tube bearing life testing device, comprising a test bench and a fixture base. A vacuum quartz glass cover is detachably connected to the fixture base, and a test chamber is hollowed out in the vacuum quartz glass cover. The test chamber contains a bearing to be tested, a rotor copper sleeve for cooperating with the bearing to be tested, and a target disk for cooperating with the rotor copper sleeve. The fixture base is provided with a heating structure for heating the target disk through the Joule effect to simulate the high-temperature environment generated by electron beam bombardment during actual bearing operation, and a driving structure for driving the bearing to be tested to rotate through the principle of electromagnetic induction to simulate the actual operating conditions of the bearing. The test bench is provided with a vacuuming structure for extracting air from the inside of the test chamber to simulate the vacuum environment during actual bearing operation. The fixture base is provided with a detection structure for monitoring the bearing speed and the target disk temperature.

[0007] The advantages of adopting the above technical solution are as follows: The basic load-bearing structure is built using a test bench and tooling base, while the vacuum quartz glass cover is detachably connected to the tooling base, facilitating disassembly, assembly, and replacement of the bearing to be tested; the test chamber contains the bearing to be tested, the rotor copper sleeve, and the target disk, with each component fitting closely to the actual assembly relationship of the bearing, ensuring the realism of the simulated operating conditions; the heating structure heats the target disk through the Joule effect, accurately simulating the high-temperature environment of the actual bearing operation; the drive structure drives the bearing to rotate based on the principle of electromagnetic induction, thereby replicating the actual rotational conditions of the bearing; and the vacuum structure further enhances the simulation. The air in the test chamber is extracted to create a vacuum environment for the actual operation of the bearing, while the testing structure simultaneously monitors the bearing speed and target plate temperature, enabling real-time monitoring of key parameters during the test. Through the coordinated operation of the above structures, a dedicated life testing device adapted to CT-X-ray tube bearings is created, filling the gap of no dedicated testing device for this type of bearing. Life and performance verification can be completed before the bearing leaves the factory, avoiding subsequent losses caused by bearing quality problems from the source. The overall structure is reasonably laid out, the division of labor among the functional structures is clear, the accuracy of working condition simulation is high, and the practicality and reliability of the test are strong.

[0008] The invention further comprises: the vacuum quartz glass cover being divided into a connecting part and a flared part; a support base being provided on one side of the tooling base, and a left end cover being detachably connected to the support base; the left end cover being detachably connected to the connecting part; a bearing bushing being provided in the test chamber for fixed connection with the outer ring of the bearing to be tested; the target plate being detachably connected to the rotor copper sleeve; the rotor copper sleeve being positioned at the connecting part of the vacuum quartz glass cover; the target plate being positioned at the flared part of the vacuum quartz glass cover; the rotor copper sleeve being detachably connected to the inner ring of the bearing to be tested; a through hole being provided on the tooling base for engaging with the connecting part; and a drive structure including a coil stator being positioned between the through hole and the vacuum quartz glass cover, with the coil stator corresponding to the rotor copper sleeve. When the coil stator is energized, it releases a rotating magnetic field, which acts on the rotor copper sleeve and induces a current inside the rotor copper sleeve. The rotor copper sleeve is subjected to electromagnetic force due to this induced current and rotates following the rotating magnetic field.

[0009] The advantages of adopting the above technical solution are as follows: The vacuum quartz glass cover is divided into a connecting part and a flared part, which are adapted to the installation positions of the rotor copper sleeve and the target plate, making the component layout conform to the actual structural distribution of the bearing during operation, thus improving the fit of the working condition simulation; the tooling base is equipped with a support seat and is detachably connected to the left end cover, which is detachably fitted to the connecting part, facilitating the disassembly and assembly of the vacuum quartz glass cover and the maintenance of the internal components of the test chamber; the test chamber is equipped with a bearing bushing that is fixedly connected to the outer ring of the bearing under test, thereby ensuring the stability of the bearing outer ring; the detachable connection between the rotor copper sleeve and the inner ring of the bearing, and the detachable fit with the target plate, realize the various transmission... The components can be quickly clamped and replaced to meet the testing requirements of bearings of different specifications. The tooling base has through holes, and the coil stator is located between the through holes and the vacuum quartz glass cover and corresponds to the rotor copper sleeve. This ensures that the rotating magnetic field acts accurately on the rotor copper sleeve, thereby improving the stability and effectiveness of the electromagnetic drive. When the coil stator is energized, it generates a rotating magnetic field and induces a current in the rotor copper sleeve. The rotor copper sleeve rotates with the rotating magnetic field under the electromagnetic force. This drive method conforms to the actual electromagnetic drive principle of the bearing, restores the real rotational power of the bearing, and the non-contact drive avoids additional resistance to the bearing rotation, thereby ensuring the accuracy of the test results.

[0010] The invention further comprises: the heating structure including an induction heating coil wound on the outer peripheral wall of the flared portion of the vacuum quartz glass cover and a medium-frequency induction heater mounted on the test bench; the medium-frequency induction heater is electrically connected to the induction heating coil; the medium-frequency induction heater provides a medium-frequency alternating current to the induction heating coil to generate an alternating magnetic field; the alternating magnetic field acts on the target disk and causes induced eddy currents in the target disk; the eddy currents generate heat through the Joule effect to heat the target disk.

[0011] The advantages of adopting the above technical solution are as follows: The heating structure in the above technology consists of an induction heating coil and a medium-frequency induction heating machine. The induction heating coil is wound around the outer peripheral wall of the flared part of the vacuum quartz glass cover, without needing to be placed in the test chamber, thus avoiding damage to the airtightness and vacuum environment of the test chamber. At the same time, it achieves non-contact heating of the target plate, preventing damage to the components caused by contact between the heating components and the target plate. The medium-frequency induction heating machine is electrically connected to the induction heating coil, providing the coil with a medium-frequency alternating current, causing the coil to generate an alternating magnetic field that acts on the target plate. The target plate is heated by utilizing eddy currents and the Joule effect. The heating principle closely matches the high-temperature generation form of the actual bearing operation, resulting in high heating efficiency and convenient temperature control. The above-mentioned overall heating structure is highly compatible with the vacuum quartz glass cover, has a reasonable installation layout, does not interfere with the operation of other structures, and the heating process is stable and controllable. It can accurately simulate the high-temperature operating conditions of the actual bearing operation, ensuring the authenticity of the test environment.

[0012] The present invention further includes: the vacuum structure includes a vacuum pump mounted on the test bench, the suction end of the vacuum pump being connected to a vacuum quartz glass cover to evacuate air from inside the test chamber when the vacuum pump is running.

[0013] The advantages of adopting the above technical solution are: the vacuum pump used in the vacuum structure is a vacuum generating component, which is set on the test bench, making full use of the test bench's bearing space and making the overall layout of the device more compact; the suction end of the vacuum pump is directly connected to the vacuum quartz glass cover, realizing the direct suction of air in the test chamber, reducing gas path transmission loss, improving the efficiency and effect of vacuuming, and quickly building a vacuum environment in the test chamber that meets the actual working requirements of the bearing. It can provide a stable vacuum environment for the test chamber for a long time, ensuring the continuity and accuracy of vacuum condition simulation, and meeting the vacuum environment requirements of bearing life test.

[0014] The present invention further comprises: a right end cap detachably connected to the flared end of the vacuum quartz glass cover; a four-way suction and exhaust valve provided on the right end cap; the four-way suction and exhaust valve comprising four gas path interfaces, which are divided into a suction port, a tooling connection port, an exhaust port, and a pressure dividing port; the tooling connection port is connected to the test chamber; the suction port is connected to the output end of the vacuum pump; an exhaust valve is provided on the exhaust port; and a pressure gauge is linked to the pressure dividing port.

[0015] The advantages of adopting the above technical solution are as follows: The detachable connection of the flared end of the vacuum quartz glass cover to the right end cover facilitates the clamping, debugging, and maintenance of internal components of the test chamber, while also improving the airtightness of the test chamber. The right end cover is equipped with a four-way suction and exhaust valve, with four clearly defined gas path interfaces. The tooling connection port connects to the test chamber, ensuring effective gas path conduction. The suction port connects to the vacuum pump output, enabling vacuum extraction from the test chamber. Simultaneously, the exhaust port is equipped with an exhaust valve, allowing for pressure relief and exhaust after the test, facilitating the safe disassembly of the vacuum quartz glass cover. The pressure gauge linked to the pressure divider port enables real-time monitoring of the pressure state within the test chamber, facilitating timely adjustment of the vacuum level. The four-way suction and exhaust valve integrates suction, pressure relief, and pressure monitoring functions, simplifying the gas path control structure, reducing the number of independent gas path components, and making the gas path system layout more concise. Each interface has a dedicated function, and gas path switching is convenient, thereby significantly improving the accuracy and flexibility of vacuum control and ensuring the stability and controllability of the vacuum conditions.

[0016] The present invention further includes: a first sealing gasket is provided between the inner peripheral wall of the left end cover and the outer peripheral wall of the support base; a second sealing gasket is provided between the inner wall of the right end cover and the flared end wall of the vacuum quartz glass cover; the radial cross sections of the first sealing gasket and the second sealing gasket are both L-shaped; and both the first sealing gasket and the second sealing gasket are fluororubber gaskets.

[0017] The advantages of adopting the above technical solution are as follows: A first sealing gasket seals between the left end cover and the support base, while a second sealing gasket seals between the right end cover and the flared end wall of the vacuum quartz glass cover. This double-sealing structure significantly improves the sealing performance of the test chamber, effectively preventing external air from seeping into the test chamber and ensuring the stability of the vacuum environment. Both the first and second sealing gaskets have L-shaped radial sections, fitting the structural shape of the connection part, increasing the sealing contact area, improving the sealing fit, avoiding the generation of sealing dead angles, and further enhancing the sealing effect. Simultaneously, the sealing gaskets are made of fluororubber, possessing excellent temperature resistance, aging resistance, and sealing performance. They can adapt to the high-temperature environment and vacuum conditions within the test chamber, and are not prone to deformation or failure after long-term use, ensuring the durability and reliability of the sealing structure, reducing the frequency of seal replacement, and lowering the maintenance cost of the test device. Furthermore, the fluororubber sealing gaskets are easy to install and remove without affecting the detachable fit of various components.

[0018] The present invention further comprises: the detection structure including a temperature sensor, the temperature sensor being disposed on the top of the tooling base, the temperature measuring end of the temperature sensor being positioned towards the flared portion of the vacuum quartz glass cover, and the temperature measuring end of the temperature sensor being aligned with the target plate.

[0019] The advantages of adopting the above technical solution are as follows: The temperature sensor is positioned on top of the fixture, a reasonable installation location that does not interfere with the operation or disassembly of other structures, facilitating sensor debugging and maintenance. Simultaneously, the sensor's measuring end faces the flared portion of the vacuum quartz glass cover and is precisely aligned with the target plate, allowing direct detection of the target plate's actual temperature, avoiding detection deviations and improving the accuracy of temperature monitoring. The independently set temperature sensor, with its measuring end oriented towards the target, provides a fast response time, capturing real-time changes in the target plate temperature. This provides precise data support for temperature control of the heating structure, ensuring the stability and accuracy of high-temperature conditions within the test chamber. It ensures the target plate temperature always matches the actual operating temperature requirements of the bearing, enhancing the realism of the simulated operating conditions. Furthermore, real-time temperature monitoring can promptly detect temperature anomalies, preventing excessively high or low temperatures from affecting test results and ensuring the smooth progress of the experiment.

[0020] The present invention further comprises: the detection structure including a speed sensor, the speed sensor being disposed on the top of the support base with the detection end of the speed sensor facing the connection part of the vacuum quartz glass cover, and the detection end of the speed sensor being disposed corresponding to the position of the rotor copper sleeve.

[0021] The advantages of adopting the above technical solution are as follows: The speed sensor is positioned on top of the support base, fully utilizing the installation space and making the overall structure of the device more compact, facilitating sensor installation and debugging. The sensor's detection end faces the vacuum quartz glass cover connection and corresponds to the rotor copper sleeve position, allowing direct detection of the rotor copper sleeve's rotational state. Since the rotor copper sleeve is directly connected to the bearing inner ring, the detection result directly reflects the actual bearing speed, avoiding speed deviations caused by indirect detection and improving the accuracy of speed monitoring. Simultaneously, this non-contact detection method avoids mechanical contact with the rotor copper sleeve, not affecting the rotational movement of the rotor copper sleeve and bearing, ensuring the authenticity of the bearing's rotational condition. Real-time speed monitoring provides data for the control of the drive structure, ensuring the bearing speed always matches actual working requirements, promptly detecting speed anomalies, and guaranteeing the stability of test parameters and the accuracy of test results.

[0022] The present invention further includes a vibration sensor disposed on the top of the support base.

[0023] The advantages of adopting the above technical solution are: the vibration sensor is set on the top of the support base, and its installation position is close to the bearing to be tested, which can accurately capture the vibration signal during the operation of the bearing, and improve the sensitivity and accuracy of vibration monitoring; the setting of the vibration sensor realizes the real-time monitoring of the bearing vibration state, can promptly detect abnormal vibrations during the operation of the bearing, effectively judge the working performance and wear state of the bearing, provide important detection basis for bearing life and performance evaluation, and improve the comprehensiveness of test detection.

[0024] The present invention further includes: an axial flow fan is provided on the test bench, and the air outlet of the axial flow fan is oriented towards the vacuum quartz glass cover.

[0025] The advantages of adopting the above technical solution are: the air outlet of the axial flow fan in the above technology is oriented towards the vacuum quartz glass cover, which can directionally dissipate heat from the vacuum quartz glass cover and surrounding drive, heating and other structures, and promptly remove the heat generated during operation, so as to avoid damage to the structure due to excessive temperature and ensure the working stability and service life of each structure. Attached Figure Description

[0026] Figure 1 This is a three-dimensional view of the present invention; Figure 2 This is a top view of the present invention; Figure 3 This is a cross-sectional view of the present invention; Figure 4 for Figure 3 A magnified view of part A in the middle; Figure 5 for Figure 3 A magnified view of part B in the middle section. Detailed Implementation

[0027] This invention provides a CT-X-ray tube bearing life testing device, including a test bench 1 and a fixture base 2. A vacuum quartz glass cover 21 is detachably connected to the fixture base 2. The vacuum quartz glass cover 21 has a hollow test chamber 211. The test chamber 211 contains a bearing 22 to be tested, a rotor copper sleeve 23 for cooperating with the bearing 22, and a target disk 231 for cooperating with the rotor copper sleeve 23. The fixture base 2 is equipped with a heating structure for heating the target disk 231 through the Joule effect to simulate the high-temperature environment generated by electron beam bombardment during actual bearing operation, and a driving structure for driving the bearing 22 to rotate through electromagnetic induction to simulate the actual operating conditions of the bearing. The test bench 1 is equipped with a mechanism for extracting the contents of the test chamber 211. The vacuum structure simulates the vacuum environment of the bearing during actual operation. The fixture base 2 is equipped with a detection structure for monitoring the bearing speed and the temperature of the target disk 231. The vacuum quartz glass cover 21 is divided into a connecting part 212 and a flared part 213. A support base 3 is provided on one side of the fixture base 2, and a left end cover 31 is detachably connected to the support base 3. The left end cover 31 is detachably connected to the connecting part 212. A bearing bushing 24 is provided in the test chamber 211 for fixed connection to the outer ring of the bearing 22 under test. The target disk 231 is detachably connected to the rotor copper sleeve 23. The rotor copper sleeve 23 is located at the connecting part 212 of the vacuum quartz glass cover 21, and the target disk 231 is located at the flared part 213 of the vacuum quartz glass cover 21. Position 13: The rotor copper sleeve 23 is detachably connected to the inner ring of the bearing 22 under test. The tooling base 2 has a through hole 25 for cooperating with the connecting part 212. The driving structure includes a coil stator 26, which is disposed between the through hole 25 and the vacuum quartz glass cover 21, and the coil stator 26 is correspondingly disposed with the rotor copper sleeve 23. When the coil stator 26 is energized, it releases a rotating magnetic field. This rotating magnetic field acts on the rotor copper sleeve 23 and induces a current inside the rotor copper sleeve 23. The rotor copper sleeve 23 is subjected to electromagnetic force due to the induced current and rotates following the rotating magnetic field. The heating structure includes an induction heating coil 4 wound on the outer peripheral wall of the flared part 213 of the vacuum quartz glass cover 21 and a heating element disposed on the test table. The intermediate frequency induction heating unit 41 on the test bench 1 is electrically connected to the induction heating coil 4. The intermediate frequency induction heating unit 41 provides intermediate frequency alternating current to the induction heating coil 4, causing the induction heating coil 4 to generate an alternating magnetic field. This alternating magnetic field acts on the target disk 231 and causes induced eddy currents in the target disk 231. These eddy currents generate heat through the Joule effect to heat the target disk 231. The vacuum structure includes a vacuum pump 5 installed on the test bench 1. The suction end of the vacuum pump 5 is connected to the vacuum quartz glass cover 21 to evacuate the air inside the test chamber 211 when the vacuum pump 5 is running. The flared end 213 of the vacuum quartz glass cover 21 is detachably connected to a right end cover 32, which is equipped with a four-way suction and exhaust valve 51.The four-way intake and exhaust valve 51 includes four air passage interfaces, which are divided into an intake port 511, a tooling connection port 512, an exhaust port 513, and a pressure dividing port 514. The tooling connection port 512 is connected to the test chamber 211. The intake port 511 is connected to the output end of the vacuum pump 5. An exhaust valve 515 is provided on the exhaust port 513. A pressure gauge 52 is linked to the pressure dividing port 514. A first sealing gasket 33 is sealed between the inner peripheral wall of the left end cover 31 and the outer peripheral wall of the support base 3. A second sealing gasket 34 is sealed between the inner wall of the right end cover 32 and the end wall of the flared portion 213 of the vacuum quartz glass cover 21. The radial cross-sections of the first sealing gasket 33 and the second sealing gasket 34 are both L-shaped. All 34 are fluororubber sealing gaskets. The detection structure includes a temperature sensor 6, which is located on the top of the tooling base 2. The temperature measuring end of the temperature sensor 6 faces the flared portion 213 of the vacuum quartz glass cover 21 and is aligned with the target plate 231. The detection structure also includes a speed sensor 61, which is located on the top of the support base 3 and has its measuring end facing the connection portion 212 of the vacuum quartz glass cover 21. The measuring end of the speed sensor 61 corresponds to the rotor copper sleeve 23. The detection structure also includes a vibration sensor 62 located on the top of the support base 3. An axial flow fan 11 is provided on the test bench 1, and the outlet of the axial flow fan 11 faces the vacuum quartz glass cover 21.

[0028] Overall operation flow of the CT-X-ray tube bearing life testing device: 1. Assembly and Debugging Stage: First, fix the outer ring of the bearing to be tested to the bearing bushing, and detachably connect the inner ring to the rotor copper sleeve. Then, assemble the target plate to the rotor copper sleeve. Place the assembled assembly into the test chamber of the vacuum quartz glass cover. Complete the detachable connection between the vacuum quartz glass cover and the tooling base, left end cover, and right end cover. Install L-shaped fluororubber gaskets at each connection point to ensure sealing performance. Then, accurately install the coil stator and induction heating coil. Assemble the four-way intake and exhaust valves to the right end cover and connect all air passage interfaces. Finally, install the temperature sensor, speed sensor, and vibration sensor to the designated positions and complete the linkage debugging of the sensors and data acquisition system. At the same time, connect the axial flow fan, medium frequency induction heater, and vacuum pump to the power supply and control system to complete the pre-debugging of the entire device.

[0029] 2. Vacuum Construction Stage: First, close the exhaust valve of the four-way intake and exhaust valve, keep the suction port connected to the suction end of the vacuum pump, start the vacuum pump on the test bench, and perform evacuation operation inside the test chamber through the tooling connection port of the four-way intake and exhaust valve. Monitor the pressure change inside the test chamber in real time through the pressure gauge linked to the pressure divider port until the test chamber reaches the vacuum environment required for the actual operation of the bearing. Then, turn off the vacuum pump and keep the gas path of the four-way intake and exhaust valve sealed to complete the construction and maintenance of the vacuum environment in the test chamber.

[0030] 3. Start-up phase: First, start the axial flow fan on the test bench, directing its outlet towards the vacuum quartz glass cover and coil stator for continuous heat dissipation. Then, energize the coil stator of the drive structure. The coil stator releases a rotating magnetic field that acts on the rotor copper sleeve, causing the rotor copper sleeve to generate an induced current and rotate under electromagnetic force. This, in turn, drives the inner ring of the bearing under test to rotate synchronously, simulating the bearing rotation condition. After the bearing speed stabilizes, start the medium-frequency induction heater to provide a medium-frequency alternating current to the induction heating coil wound in the flared part of the vacuum quartz glass cover. This causes the induction heating coil to generate an alternating magnetic field that acts on the target disk. Induction eddy currents are generated inside the target disk, which generate heat through the Joule effect and gradually increase the temperature, simulating the high-temperature environment of the actual bearing operation.

[0031] 4. Real-time monitoring phase: After the device enters the normal test state, all detection structures start synchronously and are monitored in real time throughout the process. The speed sensor detects the rotation status of the rotor copper sleeve to provide feedback on the actual speed of the bearing, the temperature sensor accurately detects the real-time temperature of the target plate, and the vibration sensor captures the vibration signal during the bearing operation. All detection data are transmitted to the data acquisition system in real time for recording, storage, and analysis. At the same time, the control system can dynamically fine-tune the speed of the drive structure and the temperature of the heating structure based on the monitoring data to ensure that the vacuum, high temperature, and rotation speed of the test chamber always match the actual working conditions of the bearing. If any abnormalities are detected in the speed, temperature, or vibration, the system will issue an alarm in a timely manner and, if necessary, link all structures to stop for protection.

[0032] 5. Test Completion Stage: After the device has run for the preset test duration, first turn off the medium frequency induction heater to stop heating the target plate, and keep the coil stator running. Use the axial flow fan to continuously dissipate heat to gradually cool down the target plate and test chamber. After the test chamber temperature drops to room temperature, turn off the power supply to the coil stator to stop the rotation drive of the bearing. At the same time, keep the axial flow fan running for a period of time until all structures of the device have cooled down to room temperature. Then turn off the axial flow fan to complete the shutdown operation of the entire device.

[0033] 6. Pressure Relief and Disassembly Stage: After the test operation stops, slowly open the exhaust valve of the four-way intake and exhaust valve, and slowly replenish air into the test chamber through the exhaust port to gradually balance the pressure inside the test chamber with the external atmospheric pressure, so as to avoid damage to the device components due to excessive pressure difference; after the pressure gauge shows that the pressure inside and outside the test chamber is balanced, close the exhaust valve, and disassemble the four-way intake and exhaust valve, the right end cover, and the vacuum quartz glass cover in sequence. Take out the bearings and supporting components after the test, and complete the disassembly of the entire device. Then, clean, inspect and maintain each component of the device to prepare for the next test.

[0034] The temperature sensors, speed sensors, vibration sensors, axial flow fans, and medium-frequency induction heaters used in the above technologies are all existing mature industrial electronic components. Each component has a reserved standard communication interface, which can establish communication with external industrial control equipment (such as industrial computers, control cabinets, etc.) through conventional connection methods such as wires and industrial buses. The industrial control equipment sends electrical signal commands to realize the start-up and shutdown of each component, adjustment of operating parameters, and control of working status. Its communication connection method and start-up and shutdown control logic all follow existing common industrial control technical specifications. The energization control of the induction heating coil and the coil stator in this device are also existing mature electrical control technologies. An electrical connection is established between the external industrial control equipment and the power supply circuit of the medium-frequency induction heater and the coil stator. The industrial control equipment regulates the on / off of the switching devices in the power supply circuit and the output power and current frequency to realize the energization and start-up, power adjustment, and power-off shutdown of the induction heating coil and the coil stator. The entire energization control process is realized based on existing power electronic control principles and conventional power distribution line layout.

[0035] The piping between the four-way intake / exhaust valve and the vacuum pump is not shown in the accompanying drawings to avoid interfering with the drawings. In fact, the connection is made through piping, and this connection method is existing technology, so it is not shown in detail.

[0036] In the above technology, the bearing to be tested is a ball-tube bearing, wherein the outer ring of the ball-tube bearing is marked as 221 in the attached drawings of the specification, and the inner ring is marked as 222.

[0037] The foregoing has shown and described the basic principles and main features of the present invention, as well as its advantages. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. A CT-X-ray tube bearing life testing device, characterized in that: The device includes a test bench and a fixture base. A vacuum quartz glass cover is detachably connected to the fixture base. The vacuum quartz glass cover has a hollow test chamber. The test chamber contains a bearing to be tested, a rotor copper sleeve for cooperating with the bearing, and a target disk for cooperating with the rotor copper sleeve. The fixture base is equipped with a heating structure for heating the target disk through the Joule effect to simulate the high-temperature environment generated by electron beam bombardment during actual bearing operation, and a driving structure for driving the bearing to be tested to rotate through the principle of electromagnetic induction to simulate the actual operating conditions of the bearing. The test bench is equipped with a vacuuming structure for extracting air from the inside of the test chamber to simulate the vacuum environment during actual bearing operation. The fixture base is equipped with a detection structure for monitoring the bearing speed and the target disk temperature.

2. The CT-X-ray tube bearing life testing device according to claim 1, characterized in that: The vacuum quartz glass cover is divided into a connecting part and a flared part. A support base is provided on one side of the tooling base, and a left end cover is detachably connected to the support base. The left end cover is detachably connected to the connecting part. A bearing bushing for fixed connection with the outer ring of the bearing to be tested is provided in the test chamber. The target plate is detachably connected to the rotor copper sleeve. The rotor copper sleeve is located at the connecting part of the vacuum quartz glass cover. The target plate is located at the flared part of the vacuum quartz glass cover. The rotor copper sleeve is detachably connected to the inner ring of the bearing to be tested. A through hole is provided on the tooling base for cooperation with the connecting part. The drive structure includes a coil stator. The coil stator is located between the through hole and the vacuum quartz glass cover, and the coil stator is correspondingly arranged with the rotor copper sleeve. When the coil stator is energized, it releases a rotating magnetic field. The rotating magnetic field acts on the rotor copper sleeve and induces a current inside the rotor copper sleeve. The rotor copper sleeve is subjected to electromagnetic force due to the induced current and rotates following the rotating magnetic field.

3. The CT-X-ray tube bearing life testing device according to claim 2, characterized in that: The heating structure includes an induction heating coil wound on the outer peripheral wall of the flared part of a vacuum quartz glass cover and a medium-frequency induction heater mounted on a test bench. The medium-frequency induction heater is electrically connected to the induction heating coil. The medium-frequency induction heater provides a medium-frequency alternating current to the induction heating coil, causing the induction heating coil to generate an alternating magnetic field. This alternating magnetic field acts on the target disk and causes induced eddy currents in the target disk. These eddy currents generate heat through the Joule effect to heat the target disk.

4. The CT-X-ray tube bearing life testing device according to claim 2, characterized in that: The vacuum structure includes a vacuum pump mounted on the test bench, with the suction end of the vacuum pump connected to a vacuum quartz glass cover to draw air from inside the test chamber when the vacuum pump is running.

5. The CT-X-ray tube bearing life testing device according to claim 4, characterized in that: The flared end of the vacuum quartz glass cover is detachably connected to a right end cover, which is equipped with a four-way suction and exhaust valve. The four-way suction and exhaust valve includes four gas path interfaces, which are divided into a suction port, a tooling connection port, an exhaust port, and a pressure dividing port. The tooling connection port is connected to the test chamber, the suction port is connected to the output end of the vacuum pump, the exhaust port is equipped with an exhaust valve, and the pressure dividing port is linked to a pressure gauge.

6. The CT-X-ray tube bearing life testing device according to claim 5, characterized in that: A first sealing gasket is used to seal the inner peripheral wall of the left end cap and the outer peripheral wall of the support base. A second sealing gasket is used to seal the inner wall of the right end cap and the flared end wall of the vacuum quartz glass cover. The radial cross sections of the first sealing gasket and the second sealing gasket are both "L" shaped. Both the first sealing gasket and the second sealing gasket are fluororubber gaskets.

7. The CT-X-ray tube bearing life testing device according to claim 2, characterized in that: The detection structure includes a temperature sensor, which is located on the top of the fixture. The temperature sensor's measuring end is positioned towards the flared portion of the vacuum quartz glass cover, and the measuring end is aligned with the target plate.

8. The CT-X-ray tube bearing life testing device according to claim 2, characterized in that: The detection structure includes a speed sensor, which is located on the top of the support base with its detection end facing the connection part of the vacuum quartz glass cover. The detection end of the speed sensor is located corresponding to the position of the rotor copper sleeve.

9. A CT-X-ray tube bearing life testing device according to claim 2, characterized in that: The detection structure includes a vibration sensor mounted on the top of the support.

10. The CT-X-ray tube bearing life testing device according to claim 1, characterized in that: The test bench is equipped with an axial flow fan, and the outlet of the axial flow fan is oriented towards the vacuum quartz glass cover.

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