A nuclear primary pump mechanical seal end face detection device

Abstract

The utility model belongs to the field of nuclear power plant main pump overhauling, concretely relates to a nuclear main pump mechanical seal end face detection device, and the device includes steel frame, detection platform and detection device, and detection platform is established on the steel frame upper end, and detection device sets up on the detection platform, and detection device includes laser interference sensor, polarizing filter, pneumatic cross roller guide rail, Z direction electric drive screw rod movement pair and sensor mounting plate, and pneumatic cross roller guide rail sets up on the detection platform, and Z direction electric drive screw rod movement pair is equipped on pneumatic cross roller guide rail, and sensor mounting plate is installed on Z direction electric drive screw rod movement pair, and laser interference sensor and polarizing filter are installed on sensor mounting plate, and polarizing filter is installed on laser interference sensor, and laser laser interference sensor 7 and polarizing filter are used for scanning the sealing surface of the detected part and collecting data. The device adopts pneumatic cross roller guide rail, Z direction electric drive screw rod movement pair and precision torque motor to realize the movement of the detected surface and sensor each direction, so that the continuous measurement to the sealing surface can be realized, and the appearance depth data of entire sealing ring surface, three-dimensional model can be formed, and the sealing surface taper, surface roughness etc. can be directly read.

Description

Technical Field

[0001] This utility model belongs to the field of nuclear power plant main pump maintenance, specifically relating to a nuclear main pump mechanical seal end face detection device. Background Technology

[0002] The main pump is a key piece of equipment in a nuclear power plant. The mechanical seal, as one of the key components of the main pump, is used to limit the leakage of reactor coolant. It is the most easily damaged component on the main pump. Even a slight operational deviation can cause abnormal leakage and other problems. In severe cases, it may lead to an emergency shutdown of the nuclear reactor, threatening the safe and stable operation of the power plant and potentially causing huge economic losses.

[0003] The mechanical seal of the main pump in a nuclear power plant requires extremely high precision. Its sealing end face is provided with a conical surface of about several hundred micro-arcs. During operation, this tiny conical surface plays a role in generating hydrostatic pressure, thereby achieving the sealing of the main pump and ensuring its long-term safe operation.

[0004] The morphology of the sealing surface includes minute cone angles, and its integrity sensitively affects sealing performance. In the prior art, the relative height dimension of local positions on the sealing surface is usually measured by using a dial indicator to mark points. This method has low measurement accuracy and cannot obtain complete microscopic morphological information of the sealing end face, resulting in the inability to achieve precise repair of the sealing surface and hindering the maintenance and operational status analysis of mechanical seals. Utility Model Content

[0005] This invention proposes a device for detecting the mechanical seal end face of a nuclear main pump, which solves the problems of low measurement accuracy and inability to obtain complete microscopic morphological information of the sealing end face in existing main pump mechanical seal end face detection methods.

[0006] The technical solution of this utility model:

[0007] This utility model proposes a detection device for the mechanical seal end face of a nuclear main pump. The device includes a steel frame, a detection platform, and a detection unit. The detection platform is located on the upper end of the steel frame, and the detection unit is mounted on the detection platform. The detection unit includes a laser interferometer sensor, a polarizing filter, a pneumatic cross roller guide, a Z-axis electric drive screw kinematic pair, and a sensor mounting plate. The pneumatic cross roller guide is mounted on the detection platform, and a Z-axis electric drive screw kinematic pair is provided on the pneumatic cross roller guide. The sensor mounting plate is mounted on the Z-axis electric drive screw kinematic pair, and a laser interferometer sensor and a polarizing filter are mounted on the sensor mounting plate. The polarizing filter is mounted on the laser interferometer sensor. The laser interferometer sensor and the polarizing filter are used to scan the sealing surface of the part being tested and collect data.

[0008] In some embodiments, the steel frame includes steel square columns, steel beams, and base connecting blocks. The steel square columns are welded together by the steel beams, and the base connecting blocks are welded to the top of the steel square columns. The base connecting blocks are used to connect the testing platform.

[0009] In some embodiments, the bottom of the steel square column is provided with swivel casters for moving and transporting the device.

[0010] In some embodiments, the testing platform includes a marble platform, marble columns, marble beams, and a loading platform. The marble platform is connected to a base connecting block. The marble platform is located at the top of a steel frame. The marble columns are located at the top of the marble platform. A marble beam is located at the top of the marble columns. A pneumatic cross roller guide is provided on the marble beam. A loading platform is located below the marble beam. The loading platform is used to hold the parts to be tested.

[0011] In some embodiments, the stage is provided with threaded holes for connecting and fixing the part to be tested.

[0012] In some embodiments, the detection platform further includes a precision torque motor, which is mounted on a marble platform and has a platform at its top. The precision torque motor is used to drive the platform to rotate.

[0013] In some embodiments, the detection device is further provided with an air source unit and a cable protection rail. The air source unit is located at the rear end of the marble platform. The air source unit provides compressed air to the pneumatic cross roller guide and provides power to the pneumatic cross roller guide. The cable protection rail is located above the Z-axis electric drive ball screw kinematic pair (please supplement the connection relationship and function of the cable protection rail).

[0014] In some embodiments, the detection device is further provided with a servo motor, which is mounted on a Z-axis electric drive lead screw kinematic pair. The servo motor connects the Z-axis electric drive lead screw kinematic pair and the sensor mounting plate, and drives the laser interference sensor and the polarizing filter to move up and down.

[0015] In some embodiments, the device further includes an industrial computer and a data acquisition card. The industrial computer is electrically connected to the laser interference sensor, servo motor, precision torque motor, air source unit, and data acquisition card. The data acquisition card is wired to the laser interference sensor. The industrial computer is used to control the device to scan the sealed surface of the part being inspected. The scanning data from the laser interference sensor is collected by the data acquisition card and transmitted back to the industrial computer for analysis and processing.

[0016] The beneficial effects of this utility model are:

[0017] 1. This utility model proposes a detection device for the mechanical seal end face of a nuclear main pump. The device uses a laser interferometer sensor and a polarizing filter for detection. The device has high measurement accuracy, with a measurement accuracy of ±1µm. The device has a fast detection speed, and it only takes about 20 minutes to complete the scanning of a single main pump seal end face.

[0018] 2. This utility model proposes a device for detecting the end face of a nuclear main pump mechanical seal. This device employs a pneumatic cross roller guide, an electrically driven lead screw, and a precision torque motor to move the surface being tested and the sensor in various directions. This allows for continuous measurement of the sealing surface, generating morphological depth data and a three-dimensional model of the entire sealing ring surface. The device can directly read the sealing surface taper, surface roughness, etc. Furthermore, this device has a wide detection range, suitable for measuring sealing end faces with an outer diameter less than 350mm and a height less than 150mm, and is applicable to most common mechanical seals. This non-contact measurement method avoids damage to the sealing surface and reduces the risk of radioactive contamination of personnel and tools. Attached Figure Description

[0019] Figure 1 A front view of a nuclear main pump mechanical seal end face detection device designed according to this utility model;

[0020] Figure 2 This is a left view of a nuclear main pump mechanical seal end face detection device according to the present invention;

[0021] Attached Figure Descriptions: 1. Steel square column; 2. Steel crossbeam; 3. Stable casters; 4. Base connecting block; 5. Marble platform; 6. Marble column; 7. Laser interference sensor; 8. Polarizing filter; 9. Marble crossbeam; 10. Pneumatic cross roller guide; 11. Servo motor; 12. Z-axis electric drive lead screw kinematic pair; 13. Sensor mounting plate; 14. Stage; 15. Precision torque motor; 16. Air source unit; 17. Cable protection rail. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] like Figures 1 to 2 As shown, this utility model proposes a nuclear main pump mechanical seal end face detection device, which consists of a steel frame, a detection platform, a detection device, an industrial computer, and a data acquisition card.

[0024] The steel frame is welded together from four steel square columns 1, steel beams 2, and base connecting blocks 4. The four steel square columns 1 are connected by steel beams 2. The base connecting blocks 4 are welded to the top of the steel square columns 1 and are used to connect the testing platform. Each of the four steel square columns 1 is equipped with a swivel caster 3, which is used for moving and transporting this patented device.

[0025] The testing platform comprises a marble platform 5, marble columns 6, marble beams 9, a stage 14, and a precision torque motor 15. The marble platform 5 is connected to a base connecting block 4 and is positioned at the top of a steel frame. The marble columns 6 are located on top of the marble platform 5, and the marble beam 9 is positioned at the top of the marble columns 6. The stage 14 is positioned below the marble beam 9 and is used to hold the parts to be tested. It is designed with threaded holes for securing the parts. The stage 14 is mounted on the marble platform 5 and is driven by the precision torque motor 15 to achieve rotational movement of the stage 14 around its vertical axis (C-axis rotation).

[0026] The detection device includes a laser interferometer sensor 7, a polarizing filter 8, a pneumatic cross roller guide 10, a servo motor 11, a Z-axis electric drive screw pair 12, a sensor mounting plate 13, a cable protection rail 17, and an air source unit 16. The pneumatic cross roller guide 10 is mounted on a marble beam 9 and is supplied with compressed air by the air source unit 16, which is installed on the side and rear of the marble platform 5, enabling the detection device to move laterally (X-axis movement) along the marble beam 9. The servo motor 11 is mounted on the pneumatic cross roller guide 10, and the sensor mounting plate 13 is mounted on the Z-axis electric drive screw pair 12. The laser interferometer sensor 7 and the polarizing filter 8 are mounted on the sensor mounting plate 13. The servo motor 11 is connected to the Z-axis electric drive screw pair 12 and the sensor mounting plate 13, and under the drive of the servo motor 11, the laser interferometer sensor 7 and the polarizing filter 8 move up and down (Z-axis movement). The polarizing filter 8, consisting of a polarizer and a filter, is mounted on the laser interferometer sensor 7. The laser interferometer sensor 7 and the polarizing filter 8 are used to scan the sealing surface of the inspected part and collect data. This device offers high measurement accuracy of ±1µm and fast detection speed; scanning a single main pump sealing end face (collecting 350,000 data points) takes only about 20 minutes.

[0027] The cable protection rail 17 is positioned above the Z-axis electrically driven lead screw kinematic pair 12 to accommodate cables and protect them during equipment operation. This device utilizes a pneumatic cross roller guide 10, an electrically driven lead screw kinematic pair, and a precision torque motor to move the measured surface and sensor in various directions. This enables continuous measurement of the sealing surface, generating morphological depth data and a three-dimensional model of the entire sealing ring surface. It allows direct reading of the sealing surface taper, surface roughness, etc. Furthermore, this device has a wide detection range, suitable for measuring sealing end faces with an outer diameter less than 350mm and a height less than 150mm, and is applicable to most common mechanical seals. This non-contact measurement method prevents damage to the sealing surface and reduces the risk of radioactive contamination of personnel and tools.

[0028] The industrial computer and data acquisition card are independent components. The industrial computer is connected to the laser interferometer sensor 7, servo motor 11, precision torque motor 15, air supply unit 16, and data acquisition card via signal transmission wires. The data acquisition card is also connected to the laser interferometer sensor 7 via signal transmission wires. The industrial computer controls the movement of the laser interferometer sensor 7 in the X and Z directions and the rotation of the stage 14 to scan the sealed surface of the inspected part. The data scanned by the laser interferometer sensor 7 is collected by the data acquisition card and transmitted back to the industrial computer for analysis and processing.

[0029] This utility model proposes a nuclear main pump mechanical seal end face detection device. The working process of this nuclear main pump mechanical seal end face detection device is as follows:

[0030] First, connect the power and air supply of the device, and turn on the air supply unit 16 and the industrial computer. The industrial computer controls the pneumatic cross roller guide 10, servo motor 11, and precision torque motor 15 to reset the X, Z, and C axes of the detection device. Place and fix the part to be inspected on the stage 14, and use the industrial computer to adjust the position of the laser interferometer sensor 7 for laser focusing on the part. Create a measurement task, set scanning parameters, and start automatic scanning using the industrial computer. Control the laser interferometer sensor 7 to scan and detect the part, and collect measurement data. The data acquisition card 18 collects the data from the laser interferometer sensor 7 and transmits it back to the industrial computer. The industrial computer analyzes the measurement data and performs 3D imaging, reading the shape and contour of the sealing end face, and obtaining data such as the minute cone angle and surface roughness of the sealing end face of the part being inspected.

[0031] The embodiments of this utility model have been described in detail above. This utility model is not limited to the above examples. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this utility model.

Claims

1. A device for detecting the end face of a nuclear main pump mechanical seal, characterized in that, The device includes a steel frame, a detection platform, and a detection device. The detection platform is located on the upper end of the steel frame, and the detection device is located on the detection platform. The detection device includes a laser interference sensor (7), a polarizing filter (8), a pneumatic cross roller guide (10), a Z-axis electric drive screw motion pair (12), and a sensor mounting plate (13). The pneumatic cross roller guide (10) is located on the detection platform. The Z-axis electric drive screw motion pair (12) is provided on the pneumatic cross roller guide (10). The sensor mounting plate (13) is installed on the Z-axis electric drive screw motion pair (12). The laser interference sensor (7) and the polarizing filter (8) are installed on the sensor mounting plate (13). The polarizing filter (8) is installed on the laser interference sensor (7). The laser interference sensor (7) and the polarizing filter (8) are used to scan the sealed surface of the part being tested and collect data.

2. The nuclear main pump mechanical seal end face detection device according to claim 1, characterized in that, The steel frame includes steel square columns (1), steel beams (2) and base connecting blocks (4). The steel square columns (1) are welded together by the steel beams (2). The base connecting blocks (4) are welded to the top of the steel square columns (1). The base connecting blocks (4) are used to connect the detection platform.

3. The nuclear main pump mechanical seal end face detection device according to claim 2, characterized in that, The bottom of the steel square column (1) is equipped with a swivel caster (3), which is used for the movement and transportation of the device.

4. The nuclear main pump mechanical seal end face detection device according to claim 3, characterized in that, The testing platform includes a marble platform (5), a marble column (6), a marble beam (9), and a platform (14). The marble platform (5) is connected to the base connecting block (4). The marble platform (5) is located at the top of the steel frame. The marble column (6) is located at the top of the marble platform (5). The marble beam (9) is located at the top of the marble column (6). The pneumatic cross roller guide (10) is located on the marble beam (9). The platform (14) is located below the marble beam (9). The platform (14) is used to hold the parts to be tested.

5. The nuclear main pump mechanical seal end face detection device according to claim 4, characterized in that, The stage (14) is provided with a threaded hole, which is used to connect and fix the part to be tested.

6. The nuclear main pump mechanical seal end face detection device according to claim 5, characterized in that, The detection platform also includes a precision torque motor, which is mounted on the marble platform (5). The top of the precision torque motor is provided with the platform (14), and the precision torque motor is used to drive the platform (14) to rotate.

7. The nuclear main pump mechanical seal end face detection device according to claim 6, characterized in that, The detection device is also equipped with an air source unit (16) and a cable protection rail (17). The air source unit (16) is located at the rear end of the marble platform. The air source unit (16) provides compressed air to the pneumatic cross roller guide (10) and provides power to the pneumatic cross roller guide (10). The cable protection rail (17) is located above the Z-direction electric drive screw motion pair (12) and is used to arrange cables and protect the cables when the equipment is running.

8. The nuclear main pump mechanical seal end face detection device according to claim 6, characterized in that, The detection device is also equipped with a servo motor (11), which is mounted on the Z-axis electric drive screw motion pair (12). The servo motor (11) connects the Z-axis electric drive screw motion pair (12) and the sensor mounting plate (13). The servo motor (11) drives the laser interference sensor (7) and the polarizing filter (8) to move up and down.

9. The nuclear main pump mechanical seal end face detection device according to claim 8, characterized in that, The device is also equipped with an industrial computer and a data acquisition card. The industrial computer is electrically connected to the laser interference sensor (7), servo motor (11), precision torque motor, air source unit (16), and data acquisition card. The data acquisition card is wired to the laser interference sensor (7). The industrial computer is used to control the device to scan the sealed surface of the part being inspected. The scanning data of the laser interference sensor (7) is collected by the data acquisition card and transmitted back to the industrial computer for analysis and processing.

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