A method and device for detecting the pressure of a silicon stack of a thyristor assembly of a converter valve

Abstract

The application relates to a method and device for detecting the silicon stack pressure of a thyristor assembly of a converter valve. The method comprises: pressing the threaded ejector rod of a spring pressing assembly towards the thyristor assembly until the standard pressure is reached, determining whether the position of the limiting nut changes before and after the pressing, if the position changes, the silicon stack pressure is less than the standard pressure and unqualified, and if the position does not change, the silicon stack pressure is qualified. The application provides a novel method for detecting the silicon stack pressure of a thyristor assembly of a converter valve, which determines whether the silicon stack pressure is qualified by detecting whether the position of the limiting nut changes before and after the threaded ejector rod is pressed by the standard pressure, so that the pressing state of the threaded ejector rod by the standard pressure is used as the judgment reference every time, and the detection structure is relatively accurate.

Description

Technical Field

[0001] This invention relates to the general field of force or stress measurement technology, and in particular to a method and apparatus for detecting silicon stack pressure of converter valve thyristor assembly. Background Technology

[0002] The converter valve is the core equipment of a DC transmission converter station, and the thyristor assembly is a key component of the converter valve. For specific details regarding the structure of the thyristor assembly in the converter valve, please refer to the Chinese Utility Model Patent No. CN208954985U, which discloses a silicon stack structure for a large thyristor converter valve assembly. After production, the thyristor assemblies are transported to the project site via various modes of transportation, or during normal operation, they are subjected to long-term vibration from the electrically connected reactors. This results in a certain degree of mechanical vibration in the thyristor assemblies, and the silicon stack pressure cannot be guaranteed to remain at the factory set pressure. Simultaneously, during long-term operation, the thyristor assemblies are affected by the structure and mechanical characteristics of pressure-bearing components such as the heat sink, disc spring unit, and thyristors. After prolonged vibration, there is a certain risk of creep and deformation, leading to a decrease in the silicon stack pressure of the thyristor assembly. All of the above may cause abnormal silicon stack pressure in the thyristor assembly. In order to ensure the stable and reliable operation of the converter valve equipment, it is necessary to regularly test the silicon stack pressure of the thyristor assembly to ensure that the silicon stack pressure is within the design pressure setpoint range and meets the process requirements of the converter valve equipment.

[0003] To address the above issues, Chinese utility model patent CN208350242U discloses a pressure testing tool for converter valve silicon stacks. Although this tool has a simple structure and is easy to use, the accuracy of the testing structure depends on the high precision of the initial pressurization assembly of the silicon stack structure. The relative positions between the disc spring assembly, the thyristor assembly end plate, and the limit nut after the initial pressurization assembly are in a standard state, which greatly reduces the accuracy of the test. Moreover, the testing structure of this monitoring tool cannot be accurately verified, resulting in unreliable test results. Summary of the Invention

[0004] The purpose of this invention is to provide a method for detecting silicon stack pressure in converter valve thyristor assemblies, thereby solving the problem of unreliability in existing silicon stack pressure detection structures for converter valve thyristor assemblies. Furthermore, the purpose of this invention is to provide a device for detecting silicon stack pressure in converter valve thyristor assemblies, thereby solving the problem of unreliability in existing silicon stack pressure detection structures for converter valve thyristor assemblies.

[0005] The method for detecting silicon stack pressure of converter valve thyristor assembly of the present invention includes applying pressure to the threaded push rod of the spring pressure assembly toward the thyristor assembly until the pressure reaches the standard pressure, determining whether the position of the limit nut or the threaded push rod changes or the amount of change before and after the pressure is applied, and judging whether the silicon stack pressure is qualified based on the change.

[0006] This invention provides a novel method for detecting the silicon stack pressure of a converter valve thyristor assembly. It determines whether the silicon stack pressure is qualified by detecting whether the position of the limit nut or threaded push rod changes or the amount of change before and after the threaded push rod is subjected to standard pressure. In this way, the pressure state of the threaded push rod under standard pressure is used as the judgment benchmark for each test, and the test structure is more accurate.

[0007] Furthermore, by comparing the distance between the limiting nut and the distance sensor before pressurization, and the distance between the limiting nut and the distance sensor bracket after pressurization, the position of the limiting nut is determined to have changed or by how much before and after pressurization, thereby determining whether the silicon stack pressure is qualified. Detection by distance comparison can accurately detect even small changes in silicon stack pressure and can clearly reflect the degree of change in silicon stack pressure.

[0008] The converter valve thyristor assembly silicon stack pressure detection device of the present invention includes a pressurization module, a detection module, and a control system. The pressurization module includes a hydraulic pump station, and the end of the hydraulic output pipeline of the hydraulic pump station is connected to a hydraulic pressurization head. The hydraulic pressurization head has a connection structure for fixed connection with an end plate and a hydraulic pusher for pushing the threaded push rod. The detection module includes a fixed base and a detection probe installed on the fixed base. Both the detection module and the pressurization module are connected to the control system. The control system has a human-machine interface module. Through the human-machine interface module, the operator can control the hydraulic output of the hydraulic pump station through the control system, thereby controlling the hydraulic pressurization head to apply a pressure equal to the standard pressure of the silicon stack to the threaded push rod. The control module provides a detection result on whether the silicon stack pressure is qualified based on the information of the position change of the limit nut or the threaded push rod before and after the threaded push rod is pressed, which is fed back by the detection module.

[0009] This invention provides a pioneering silicon stack pressure testing device for converter valve thyristor assembly. During testing, the device can apply pressure to the threaded push rod of the silicon stack structure to a standard pressure through a pressurization module. The testing module can conveniently and accurately detect whether the position of the limit nut on the threaded push rod or the threaded push rod changes before and after pressurization, as well as the magnitude of the change, thereby making an accurate judgment on whether the silicon stack pressure is qualified.

[0010] Furthermore, the mounting base includes a U-shaped frame on which the detection probe is mounted. The width of the U-shaped frame is greater than the width of the tension band on the thyristor assembly, allowing it to be fastened onto the tension band. The U-shaped frame is equipped with a locking structure for securing it to the tension band. This structural design allows the mounting base to be easily fixed to the tension band of the thyristor assembly, placing it at a position where changes in the position of the limit nut can be easily detected. This design is convenient to use and provides accurate detection.

[0011] Furthermore, the locking structure consists of set bolts screwed onto the opposite sides of the U-shaped frame. These set bolts are perpendicular to the corresponding opposite sides and are used to press against the side of the upper tension band to achieve a locking and fixing of the fixing seat and the upper tension band. The detection probe is installed on the bottom edge of the U-shaped frame. This locking structure is simple in structure and easy to manufacture. During use, simply tightening the set bolts ensures reliable position locking, making it convenient to use.

[0012] Furthermore, the detection probe is movably mounted on the U-shaped frame via a boom structure. This allows the detection probe to be easily adjusted to the required position, making it flexible and convenient to use.

[0013] Furthermore, the boom structure includes a first frame and a second frame. The first frame is ball-jointed to the U-shaped frame, and the second frame is ball-jointed to the first frame. The detection probe is mounted at the end of the second frame. The lengths of both the first and second frames are less than the length of the bottom edge of the U-shaped frame and are parallel to the bottom edge of the U-shaped frame when folded. The boom structure, formed by two hinged links, increases the range of motion of the detection probe and improves the flexibility of adjustment. Moreover, when retracted, the boom structure and the detection probe can be completely stored within the U-shaped space of the U-shaped frame through the folding of the two frames, facilitating storage and transport.

[0014] Furthermore, an electrical plug is provided on one side of the bottom edge of the U-shaped frame, facing away from both sides. This plug is electrically connected to the control system via a cable assembly to supply power and transmit signals to the detection module. This arrangement provides a wired connection between the detection module and the control system, preventing module loss, simplifying the module's structure, and ensuring reliable power supply and signal transmission.

[0015] Furthermore, the connection structure is a U-shaped bracket adapted to the slot on the end plate, with the hydraulic push head located in the middle of the U-shaped bracket. Using a U-shaped bracket for fixed connection with the end plate, which is compatible with the structure of the thyristor assembly's end plate, not only facilitates connection but also improves versatility.

[0016] Furthermore, the converter valve thyristor assembly silicon stack pressure detection device includes a mobile cabinet. The control system and hydraulic pump station are both installed inside the mobile cabinet, and the human-machine interface module is located on the top surface of the mobile cabinet. By configuring the entire detection device as a mobile cabinet structure, the control system and hydraulic pump station can be protected inside the cabinet, ensuring safety and reliability during use, and facilitating relocation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the converter valve thyristor assembly silicon stack pressure detection device of the present invention;

[0018] Figure 2This is a top view of Embodiment 1 of the pressure detection device for the converter valve thyristor assembly silicon stack of the present invention during use;

[0019] Figure 3 for Figure 2 The image shows an enlarged view of the connection points between the detection module and the pressurization module and the thyristor assembly.

[0020] Figure 4 This is a front view of Embodiment 1 of the pressure detection device for the converter valve thyristor assembly silicon stack of the present invention during use;

[0021] Figure 5 for Figure 4 The image shows an enlarged view of the connection points between the detection module and the pressurization module and the thyristor assembly.

[0022] Figure 6 This is a schematic diagram of the detection module.

[0023] Figure 7 This is a schematic diagram of the hydraulic pressure head.

[0024] Figure 8 This is a structural diagram of the human-computer interaction module.

[0025] In the diagram: 1. Mobile cabinet; 2. Pressurization module; 3. Detection module; 4. Hydraulic output pipeline; 5. Cable assembly; 6. Thyristor assembly; 11. Casters; 12. Power indicator light; 13. Pressurization indicator light; 14. Touch screen; 15. Lifting lug; 16. Power switch; 17. Pressurization knob; 18. Pressure relief knob; 19. Self-locking button; 111. Cabinet socket; 21. U-shaped bracket; 22. Hydraulic push head; 31. Electrical plug; 32. Fixing base; 33. First support rod; 34. Detection probe; 35. Set bolt; 36. Second support rod; 60. Upper tension strap; 61. End plate; 62. Threaded push rod; 63. Limit nut. Detailed Implementation

[0026] This invention provides a pioneering silicon stack pressure detection device for converter valve thyristor assembly. The detection device includes a pressurization module, a detection module, and a control system. During detection, the pressurization module applies pressure to the threaded push rod of the silicon stack structure to a standard pressure. The detection module can conveniently and accurately detect whether the position of the limiting nut on the threaded push rod changes before and after pressurization, and then make an accurate judgment on whether the silicon stack pressure has decreased based on the position change of the limiting nut.

[0027] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0028] like Figure 1-8As shown, the converter valve thyristor assembly silicon stack pressure detection device of this embodiment includes a mobile cabinet 1, a pressurization module 2 and a detection module 3. The mobile cabinet 1 is also equipped with a control system, which is connected to the pressurization module 2 and the detection module 3. The control system also includes a human-machine interface module installed on the top surface of the mobile cabinet 1 for operators to perform control operations.

[0029] The pressurization module 2 includes a hydraulic pump station. The end of the hydraulic output pipe 4 of the hydraulic pump station is connected to a hydraulically actuated pressurization head. The hydraulic pump station is installed inside the movable cabinet 1 and connected to the hydraulically actuated pressurization head via the hydraulic output pipe 4 extending out of the movable cabinet 1. The structure of the hydraulically actuated pressurization head is as follows: Figure 7 As shown, the assembly includes a U-shaped retainer 21. The two opposite sidewalls of the U-shaped retainer 21 are respectively provided with inwardly tapered retaining edges. During use, these inwardly tapered edges can be engaged with the retaining grooves on both sides of the end plate 61 of the thyristor assembly 6, thereby achieving a fixed connection between the U-shaped retainer 21 and the end plate 61. A hydraulic pusher head 22 is located in the middle of the U-shaped retainer 21. When pressure is output through the hydraulic output pipeline 4 connected to the hydraulic pressure head, the hydraulic pusher head 22 extends outward relative to the U-shaped retainer 21. The specific internal structure of the hydraulic pressure head is similar to that of the pressure head of an existing press. The structure of the end plate is a relatively mature structure in existing thyristor assemblies, disclosed in Chinese Utility Model Patent Document CN208954985U cited in the background art, and will not be described in detail here. The structure of the U-shaped retainer 21 is adapted to the structure of the end plate 61, allowing for convenient fixed connection without altering the structure of the end plate 61, and it also possesses versatility.

[0030] The detection module 3 includes a mounting base 32 and a detection probe 34 mounted on the mounting base 32. The mounting base 32 is used to fix the detection module relative to the thyristor assembly. The structure of the mounting base can be designed according to the desired fixed position of the detection module. In this embodiment, the mounting base includes a U-shaped frame. The width of the U-shaped frame is greater than the width of the tension band 60 on the thyristor assembly 6, so that it can be fastened onto the tension band 60. The detection probe 34 is mounted on the bottom edge of the U-shaped frame and is located on the open side of the U-shaped frame. Thus, when the U-shaped frame is fastened onto the tension band 60, the detection probe 34 is located between the two sides of the tension band 60, which facilitates its insertion into the position between the disc spring and the limiting nut 63 of the spring pressure assembly, thereby facilitating the detection of the position of the limiting nut 63 through the detection probe 34. Of course, in other embodiments, when the upper tension band of the thyristor assembly is replaced by a tension plate, the fixing seat can adopt a U-shaped clamp structure. The U-shaped clamp is inserted into the tension plate from the side. The upper clamping edge of the U-shaped clamp is provided with a set screw. By tightening with the set screw, it can be locked with the tension plate. At this time, the detection probe is installed on the lower clamping edge of the U-shaped clamp.

[0031] To ensure that the position of the detection probe 34 does not change during operation and to guarantee relatively accurate detection results, at least one of the opposite sides of the U-shaped frame is provided with a locking structure for locking the U-shaped frame and the upper tension band 60. The locking structure can take various forms, such as hinged movable clamping arms on the sides of the U-shaped frame, with torsion springs mounted on the pivots of the movable clamping arms to form an elastic clamping structure for clamping the edge of the upper tension band 60. In this embodiment, the locking structure is a set bolt 35 screwed onto the opposite sides of the U-shaped frame. The set bolt 35 is perpendicular to the corresponding opposite side and is used to press against the side of the upper tension band 60 to achieve locking and fixing of the fixing seat 32 and the upper tension band 60. The end of the set bolt 35 located inside the U-shaped frame is used to press against the outer side of the upper tension band 60, and a butterfly knob is installed on the end of the set bolt 35 located outside the U-shaped frame for easy tightening of the set bolt 35. The structure of the upper tension band is a relatively mature structure among existing thyristor assemblies. It is disclosed in the Chinese utility model patent document with authorization announcement number CN208350242U cited in the background art, and will not be described in detail here.

[0032] To facilitate better alignment between the detection probe 34 and the limiting nut 63 for accurate detection of the limiting nut 63's position, in this embodiment, the detection probe 34 is movably mounted on the U-shaped frame via a boom structure. Utilizing the boom's length, the detection probe 34 can be adjusted to the desired position, making it flexible and convenient to use. Specifically, the boom structure includes a first support rod 33 and a second support rod 36. The first end of the first support rod 33 is ball-jointed to the U-shaped frame, and the first end of the second support rod 36 is ball-jointed to the second end of the first support rod 33. The detection probe 34 is mounted at the second end of the second support rod 36. The lengths of both the first and second support rods 33 are less than the length of the bottom edge of the U-shaped frame. The length of the first support rod 33 is less than the distance from its connection point with the bottom edge of the U-shaped frame to one side of the U-shaped frame. After the boom structure is folded, it can be positioned parallel to the bottom edge of the U-shaped frame. The boom structure, formed by two hinged links, increases the range of motion of the detection probe 34 and improves the flexibility of adjustment. Furthermore, when retracted, the boom structure and the detection probe 34 can be arranged parallel to the bottom edge of the U-shaped frame and stored within the U-shaped space of the frame through the folding of the two frames, facilitating storage and transport. Alternatively, in other embodiments, the boom structure can be made of a metal bellows. One end of the bellows is fixedly connected to the bottom edge of the U-shaped frame, and the detection probe 34 is mounted on the other end. The bellows contains wires connecting the detection probe 34 to the electrical plug 31 bracket, allowing for position adjustment of the detection probe 34 based on the deformability of the bellows itself.

[0033] In this embodiment, to provide a more stable power supply to the detection probe 34 and ensure that the detection information from the detection probe 34 can be quickly and reliably transmitted to the control system, a wired connection is established between the detection probe 34 and the control system. Of course, in other embodiments, wireless communication can also be used between the detection probe 34 and the control system. In this case, a power module, such as a battery, needs to be installed on the U-shaped frame to power the detection probe 34. In this embodiment, an electrical plug 31 is provided on one side of the bottom edge of the U-shaped frame facing away from both sides. The electrical plug 31 is electrically connected to the control system via a cable assembly 5 to power the detection module 3 and transmit signals. A cabinet socket 111 is provided on the mobile cabinet 1. The cabinet socket 111 is electrically connected to the control system inside the cabinet. One end of the cable assembly 5 is connected to the electrical plug 31 via the socket, and the other end is connected to the cabinet socket 111 via the plug. The electrical plug 31 and the detection probe 34 are connected by a wire. The wire can be laid along the first and second support rods 36, or the first and second support rods 36 can be hollow support rods, with the wire arranged inside the hollow support rods.

[0034] The detection probe 34 specifically adopts a photoelectric distance sensor, which is positioned directly opposite the end face of the limit nut 63 during use. It detects the distance between the end face of the limit nut 63 and the detection probe before the pressure module 2 applies pressure to the threaded push rod 62, and the distance between the end face of the limit nut 63 and the detection probe after the pressure module 2 applies pressure to the threaded push rod 62 to the standard pressure. If the latter is less than the former, it indicates that the silicon stack pressure of the thyristor assembly 6 has decreased. At this time, it is necessary to adjust the position of the limit nut 63 on the threaded push rod 62 until it is tightly pressed against the end plate 61. In this way, the silicon stack pressure of the thyristor is readjusted to the standard pressure. If the latter is equal to the former, it indicates that the silicon stack pressure of the thyristor assembly 6 has not changed and the silicon stack pressure is in the standard pressure state and is in a qualified state.

[0035] The detection logic in this embodiment is to detect the distance of the limiting nut 63 before and after the threaded push rod 62 is compressed, and compare the distances to obtain the position change information of the limiting nut 63, thereby determining whether the silicon stack pressure is equal to the standard pressure. Of course, in other embodiments, a photoelectric sensor can also be used to directly detect whether the position of the limiting nut 63 changes during the entire process of the threaded push rod 62 being compressed to determine whether the silicon stack pressure is equal to the standard pressure. For example, the detection probe 34 uses an ultrasonic sensor, which detects whether the position information of the limiting nut 63 changes during the entire process of the threaded push rod 62 being compressed.

[0036] The mobile cabinet 1 can be equipped with a battery module as a power source or has a power plug 31 for connecting to mains power. The control system includes a power supply control section and a control operation section that processes information and, in conjunction with a human-machine interface module, controls the pressurization module 2 and the detection module 3. For example, Figure 8As shown, the human-machine interface module mainly includes a control panel on the top surface of the mobile cabinet 1. The control panel is equipped with a touch screen 14, a pressurization knob 17 for controlling pressurization, a pressure relief button for controlling pressure relief, a self-locking button 19, a power indicator light 12, and a pressurization indicator light 13 that illuminates during pressurization. A power switch 16 for the entire machine is located on the side of the mobile cabinet 1. Lifting lugs 15 are located on opposite sides of the top surface of the mobile cabinet 1 for hoisting. Casters 11 are located at the bottom of the mobile cabinet 1 for movement.

[0037] The use of the converter valve thyristor assembly silicon stack pressure detection device in this embodiment also demonstrates the converter valve thyristor assembly 6 silicon stack pressure detection method.

[0038] Specifically, the detection module 3 is locked and fixed near the end plate 61 on the upper clamping strap of the thyristor assembly. The position of the detection probe 34 is adjusted by adjusting the boom structure so that it is between the disc spring and the limit nut 63 and directly facing the limit nut 63. The detection module 3 is electrically connected to the mobile cabinet 1 through the cable assembly 5. The hydraulic pressure head is connected to the hydraulic output line 4 and clamped onto the end plate 61. The power switch 16 is turned on. Before pressurization, the self-locking button 19 on the operation panel is pressed to measure the distance to the limit nut 63. The measured values ​​are displayed on the touch screen 14 and saved in the control system. Then, the self-locking button 19 is pressed to restore the button state and stop the measurement. When pressurizing, pressing the self-locking button 19 pressurizes the threaded push rod 62 to the standard pressure value through the pressurization module 2. During this process, optionally, the real-time distance measurement of the limit nut 63 is performed, and the relevant data measured by the detection probe 34 is transmitted and displayed on the touch screen 14 in real time. After pressurizing to the standard pressure value, the touch screen 14 is operated to record the relevant distance measurement data.

[0039] During the above process, when pressurizing, the operator simultaneously operates both pressurizing knobs 17 to steadily pressurize the threaded push rod 62 to the standard pressure value, and the changing pressure value is displayed on the touch screen 14 in real time. If either pressurizing knob 17 is released, the hydraulic pump station stops working and stops pressurizing, and the pressure is maintained at the current pressure value. If pressurization needs to continue, both pressurizing knobs 17 must be operated simultaneously to continue hydraulic output, and the pressure display value on the touch screen 14 will change accordingly. When both pressurizing knobs 17 are operated simultaneously, the pressurization pressure reaches the standard silicon stack pressure requirement value, and even if both pressurizing knobs 17 are operated simultaneously, the hydraulic pump station can no longer continue to pressurize. After the relevant distance data is measured or the silicon stack pressure of the thyristor assembly 6 is adjusted, the pressure in the hydraulic output pipeline 4 is released by pressing and holding the pressure relief button.

[0040] The system automatically calculates the difference between the measured distances of the limit nut 63 before and after pressurization on the touch screen 14. By checking the difference in distance between the limit nut 63 before and after pressurization on the touch screen 14, the operator can determine whether the silicon stack pressure of the thyristor assembly 6 is within the required set value and whether the limit nut 63 is properly tightened.

[0041] For different specifications of converter valve thyristor assemblies 6, the standard pressure that the pressurization module 2 can output can be manually input through the touch screen 14 to adapt to the standard pressure of different specifications of converter valve thyristor assemblies 6, so as to avoid the pressurization module 2 pressurizing too much and exceeding the standard pressure of the silicon stack, which would cause damage to the silicon stack structure.

[0042] The converter valve thyristor assembly silicon stack pressure detection device uses two pressurization knobs 17. In the pressurization control logic, pressure is output only when both pressurization knobs 17 are operated simultaneously. This can prevent the operator from accidentally touching other buttons or the touch screen 14 during the pressurization process, which would affect the normal detection process of the entire device and ensure the stability of the pressurization process.

[0043] In the above description, whether the silicon stack pressure is qualified is understood as whether it is equal to the standard pressure. That is, if the distance difference is not zero during the above test, the silicon stack pressure is unqualified. However, in the usage requirements of some converter valve thyristor components, whether the silicon stack pressure is qualified can be required to be within the set range of the standard pressure. In this case, it can still be tested by the above test method. At this time, it is necessary to determine whether the distance difference is within or exceeds the set distance range corresponding to the set pressure range, and then determine whether the silicon stack pressure is qualified.

[0044] As described above in Embodiment 1 of the present invention, the converter valve thyristor assembly silicon stack pressure detection device of the present invention improves the overall efficiency and accuracy of the detection of converter valve assembly silicon stack pressure. By comparing the distance of the limit nut before pressurization with the distance of the limit nut when the standard pressure is applied, it is easy to analyze intuitively and quickly and accurately determine whether the thyristor assembly silicon stack pressure is within the required set value range. It achieves a certain degree of mechanized and automated operation, which can save a lot of manual labor and working time, and improve the safety factor of the operation to a certain extent. At the same time, it greatly improves the work efficiency and meets the needs of short-time, efficient and accurate detection of thyristor assembly silicon stack pressure at various stages such as factory calibration, on-site inspection after converter valve installation, and on-site testing during annual maintenance. Especially during the maintenance of converter valve equipment, it greatly improves the efficiency of maintenance testing of thyristor assembly silicon stack pressure, shortens the detection time of converter valve thyristor assembly silicon stack pressure, helps to shorten the power outage time of DC transmission converter valve equipment maintenance, meets the needs of lean maintenance, and improves the availability of DC transmission systems.

[0045] The present invention also provides other preferred embodiments different from Embodiment 1, which are also based on the design concept of the present invention.

[0046] For example, in other embodiments, the main difference from Embodiment 1 lies in the structural form of the fixing seat. Specifically, the fixing seat is a rectangular block structure with slots at both ends. The width of the slots is slightly smaller than the thickness of the two sides of the upper clamping band, thus allowing it to fit tightly with the upper clamping band. In use, the fixing seat can be directly clamped onto the upper clamping band from top to bottom. In this case, the detection probe can be directly fixed on the block structure, and when the block structure is clamped onto the upper clamping band, the detection probe is aligned with the limiting nut.

[0047] For example, in other embodiments, the main difference from Embodiment 1 above lies in the installation method of the detection probe on the fixed base. Specifically, the detection probe is directly hinged to the fixed base via a ball joint. In this way, during use, it is necessary to adjust the orientation of the detection probe so that it tilts towards the limiting nut. It is sufficient to detect the distance between the probe and the limiting nut or to detect the position of the limiting nut.

[0048] For example, in other embodiments, the detection probe can also be aligned radially with the threaded push rod. In this case, the thread on the threaded push rod can be used as a reference. The detection probe can detect whether the threaded thread has moved and the number of moving threads to determine whether the threaded push rod has moved and the distance of movement. Alternatively, modular grooves or modular teeth can be provided on the threaded push rod to cooperate with the detection probe to detect its displacement.

[0049] Alternatively, in other embodiments, the pressurization module and the detection module are independent modules, and the control system is an independent system. For example, the pressurization module includes a hydraulic pump station and a hydraulically operated pressurizing head connected to the end of the hydraulic output pipeline of the hydraulic pump station; the detection module includes a mounting base with a built-in battery and a detection probe mounted on the mounting base; and the control system mainly includes an independent integrated handheld controller, similar to a tablet computer. The handheld controller wirelessly communicates with both the pressurization module and the detection module to establish a control relationship. This design facilitates the maintenance and replacement of different modules and saves costs.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A method for detecting silicon stack pressure in a converter valve thyristor assembly, characterized in that, A distance sensor extends into the position between the disc spring and the limiting nut of the spring pressure assembly, applying pressure to the threaded push rod of the spring pressure assembly toward the thyristor assembly until the standard pressure is reached. The distance sensor detects and compares the distance between the limiting nut and the distance sensor before pressure is applied and the distance between the limiting nut and the distance sensor bracket after pressure is applied to determine whether the position of the limiting nut has changed or the amount of change. The amount of change is the axial displacement of the limiting nut or the threaded push rod relative to the pressure spring assembly. Based on the change, it is determined whether the silicon stack pressure is qualified. If there is no change, the silicon stack pressure is qualified. If the latter is less than the former, the position of the limiting nut on the threaded push rod is adjusted to adjust the silicon stack pressure to the standard pressure.

2. A pressure detection device for silicon stack of converter valve thyristor assembly, characterized in that, The system includes a pressurization module, a detection module, and a control system. The pressurization module includes a hydraulic pump station, with a hydraulically operated pressurizing head connected to the end of the hydraulic output pipeline of the hydraulic pump station. The hydraulically operated pressurizing head has a connection structure for fixed connection with the end plate and a hydraulic pusher for pushing the threaded push rod. The detection module includes a fixed base and a detection probe installed on the fixed base. Both the detection module and the pressurization module are connected to the control system. The control system has a human-machine interface module. Through the human-machine interface module, the operator can control the hydraulic output of the hydraulic pump station through the control system, thereby controlling the hydraulically operated pressurizing head to apply a pressure equal to the standard pressure of the silicon stack to the threaded push rod (62). The control module determines the pressure limit of the threaded push rod based on the feedback from the detection module. The positional change information of the nut or threaded push rod provides the detection result for whether the silicon stack pressure is qualified. The detection probe is a distance sensor, which extends into the position between the disc spring and the nut of the spring pressure assembly. By detecting and comparing the distance between the nut and the distance sensor before pressurization and the distance sensor bracket after pressurization, it is determined whether the position of the nut has changed or the amount of change. The amount of change is the axial displacement of the nut or threaded push rod relative to the pressure spring assembly. If there is no change, the silicon stack pressure is qualified. If the latter is less than the former, the position of the nut on the threaded push rod is adjusted to adjust the silicon stack pressure to the standard pressure.

3. The pressure detection device for the silicon stack of the converter valve thyristor assembly according to claim 2, characterized in that, The mounting base includes a U-shaped frame, on which the detection probe is mounted. The width of the U-shaped frame is greater than the width of the tension band on the thyristor assembly, allowing it to be fastened onto the tension band. The U-shaped frame is provided with a locking structure for locking and securing with the tension band.

4. The pressure detection device for the silicon stack of the converter valve thyristor assembly according to claim 3, characterized in that, The locking structure consists of set bolts screwed onto the opposite sides of the U-shaped frame. The set bolts are perpendicular to the corresponding opposite sides and are used to press against the side of the upper tension band to achieve locking and fixing of the fixed seat and the upper tension band. The detection probe is installed on the bottom edge of the U-shaped frame.

5. The pressure detection device for the silicon stack of the converter valve thyristor assembly according to claim 3, characterized in that, The detection probe is movably mounted on a U-shaped frame via a boom structure.

6. The pressure detection device for the silicon stack of the converter valve thyristor assembly according to claim 5, characterized in that, The boom structure includes a first frame and a second frame. The first frame is ball-jointed to the U-shaped frame, and the second frame is ball-jointed to the first frame. The detection probe is installed at the end of the second frame. The lengths of both the first and second frames are less than the length of the bottom edge of the U-shaped frame and are parallel to the bottom edge of the U-shaped frame after folding.

7. The converter valve thyristor assembly silicon stack pressure detection device according to claim 3, characterized in that, An electrical plug is located on one side of the bottom edge of the U-shaped frame, facing away from both sides. The electrical plug is electrically connected to the control system via a cable assembly to supply power and transmit signals to the detection module.

8. The pressure detection device for the silicon stack of the converter valve thyristor assembly according to claim 7, characterized in that, The connection structure is a U-shaped bracket that fits into the slot on the end plate, with the hydraulic push head located in the middle of the U-shaped bracket.

9. The pressure detection device for the silicon stack of the converter valve thyristor assembly according to claim 7, characterized in that, The converter valve thyristor assembly silicon stack pressure detection device includes a mobile cabinet, with the control system and hydraulic pump station installed inside the mobile cabinet, and the human-machine interface module located on the top surface of the mobile cabinet.

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