Nuclear power main pump installation and maintenance device

Abstract

The invention relates to the technical field of nuclear power, and discloses a nuclear power main pump installation and maintenance device which comprises a main supporting structure, a bearing part, a first adjusting mechanism and a second adjusting mechanism. The main supporting structure is a steel structure and comprises a base plate and a plurality of supporting columns arranged in the vertical direction, and a movable space is defined by the base plate and the supporting columns. The bearing part is used for bearing the main pump assembly and provided with an auxiliary supporting part, and the auxiliary supporting part comprises a plurality of criss-cross supporting components, forms a non-single-layer cage type structure comprising a first-layer frame and a second-layer frame and is movably connected with the multiple supporting columns. The first adjusting mechanism is used for achieving position adjustment of the bearing part in the horizontal direction, the second adjusting mechanism is used for achieving lifting adjustment of the bearing part in the vertical direction, and therefore the bearing part can bear the main pump assembly to ascend and descend along the moving space track. And better position control can be realized during the assembling or operation and maintenance period of the main pump assembly, and the mounting precision and the working efficiency are improved.

Description

Technical Field

[0001] This application relates to the field of nuclear power technology, and more specifically to a nuclear power main pump installation and maintenance device. Background Technology

[0002] The main pump in a nuclear power plant is a key piece of equipment in the nuclear power plant loop system. Its installation and operation and maintenance require specialized equipment. Existing equipment generally uses a screw jack in conjunction with a translation mechanism. During the installation of the main pump assembly, the screw jack provides lifting force during the jacking process, and the translation mechanism can also be used to fine-tune the positioning of the main pump in the X and Y directions. However, due to the large overall weight of the main pump, the existing structure has insufficient support rigidity, which makes it easy to sway or shift during jacking and fine-tuning. This results in low flange alignment accuracy, requiring operators to make repeated adjustments and affecting construction efficiency. Summary of the Invention

[0003] To address the aforementioned technical problems, the purpose of this application is to provide a nuclear power plant main pump installation and maintenance device, which solves the problems in the prior art and effectively improves the load-bearing stability and structural strength of the device.

[0004] To achieve the above objectives, this application provides a nuclear power plant main pump installation and maintenance device, comprising: The main support structure is a steel structure, including a chassis and multiple support columns extending in a vertical direction. The multiple support columns are respectively fixed to one side of the chassis, thereby jointly enclosing and forming an activity space. The support section, used to support the main pump assembly, has an auxiliary support section, which includes a plurality of crisscrossing support members. The plurality of support members form a non-single-layer cage structure including at least a first layer frame and a second layer frame. The auxiliary support section is also movably connected to a plurality of support columns. A first adjustment mechanism is provided on the support portion for adjusting the position of the support portion in the horizontal direction. A second adjustment mechanism is provided on the main support structure, and the output end of the second adjustment mechanism is correspondingly provided with the support part, for realizing the vertical position adjustment of the support part, so that the support part can rise and fall along the trajectory of the active space when carrying the main pump assembly.

[0005] In some embodiments, the second adjustment mechanism includes a plurality of servo electric cylinders; The fixed ends of the multiple servo electric cylinders are all fixed to the bottom of the main support structure, and the output ends of the multiple servo electric cylinders are respectively arranged corresponding to the auxiliary support part. When the servo electric cylinders are running, the multiple output ends drive the auxiliary support part to generate displacement, so as to realize the lifting and lowering of the main pump assembly.

[0006] In some embodiments, the auxiliary support portion further includes a base plate and reinforcing ribs, the base plate being disposed on the top layer of the cage structure; At least some of the reinforcing ribs are disposed between the supporting members in the first layer frame and the supporting members in the second layer frame to improve the structural strength.

[0007] In some embodiments, the cage structure includes two connected frames, namely a first frame and a second frame, which are connected by vertically arranged support members, thereby making the cage structure cubic in shape. The first layer frame is connected to the substrate, and the outer edge of the substrate extends beyond the outer edge of the first layer frame to form a corresponding cantilever end; In the auxiliary support section, one end of a portion of the reinforcing ribs is connected between the support member of the first layer frame and the support member of the second layer frame; the first end of the remaining portion of the reinforcing ribs is connected to the cantilever end, and the other end is connected to the corresponding support member of the second layer frame, so that this portion of the reinforcing ribs is inclined.

[0008] In some embodiments, the reinforcing ribs are symmetrically distributed, wherein the reinforcing ribs that are inclined are the first reinforcing ribs, and the reinforcing ribs that are not inclined are the second reinforcing ribs. The first reinforcing ribs are symmetrically arranged on opposite sides of the cage structure, and the second reinforcing ribs are symmetrically arranged on the other two sides of the cage structure. The number of servo cylinders is at least four. The servo cylinders are respectively distributed on the two sides of the cage structure with the first reinforcing rib. The output end of each servo cylinder is correspondingly arranged with the base plate. When the servo cylinders are running, the output ends of the multiple servo cylinders drive the base plate to rise and fall, thereby realizing the raising and lowering of the auxiliary support part.

[0009] In some embodiments, the second adjustment mechanism further includes an electric cylinder bracket, the electric cylinder bracket being provided with adapter holes, and the servo electric cylinders located on the same side being relatively fixed by passing through the corresponding adapter holes of the electric cylinder bracket; The two ends of the electric cylinder bracket are respectively fixed to the main support structure. The electric cylinder bracket has a notch adapted to the first reinforcing rib. When the auxiliary support part is raised and lowered, the first reinforcing rib moves within the notch.

[0010] In some embodiments, the support portion further includes a travel plate, the upper part of which is provided with a receiving structure for engaging at least a portion of the main pump assembly, and the lower part of the travel plate is connected to the top of the cage structure to synchronously drive the main pump assembly to move when the cage structure moves.

[0011] In some embodiments, the first adjustment mechanism includes an X-axis adjustment mechanism and a Y-axis adjustment mechanism, and the stroke plate includes a first stroke plate and a second stroke plate to jointly engage with the main pump assembly. The first stroke plate and the second stroke plate are stacked in a vertical direction. The X-axis adjustment mechanism is at least corresponding to the first travel disk and is used to realize the movement of the first travel disk in the X direction. The Y-axis adjustment mechanism is at least opposite to the second travel disk and is used to realize the movement of the second travel disk in the Y direction.

[0012] In some embodiments, the nuclear power main pump installation and maintenance device further includes an angle adjustment mechanism, and the stroke plate further includes a third stroke plate. The first stroke plate, the second stroke plate, and the third stroke plate are stacked sequentially in a vertical direction from bottom to top, and all of them have a central hollow design to support the main pump assembly. The angle adjustment mechanism cooperates with the third stroke plate to realize the rotation of the third stroke plate.

[0013] In some embodiments, the materials of the relative contact end faces of the first and second stroke discs are self-lubricating materials; And / or, the material of the relative contact end face of the second stroke disk and the third stroke disk is a self-lubricating material; And / or, the materials of the relative contact surfaces of the first travel disc and the auxiliary support are self-lubricating materials.

[0014] In some embodiments, the main support structure further includes a top crossbeam disposed between each adjacent or opposite pair of support columns to enhance the strength of the main support structure. And / or, the nuclear power main pump installation and maintenance device further includes an opening and closing structure, which is provided at least on one side of the main support structure and the support portion, so that the main support structure and the support portion can form an opening on the side through the opening and closing structure, thereby allowing the main pump assembly to be installed into the nuclear power main pump installation and maintenance device through the opening.

[0015] Compared with the prior art, the nuclear power plant main pump installation and maintenance device provided in this application has the following advantages: 1. Through the crisscrossing support components in the cage structure, the support structure has high rigidity and deformation resistance in both the horizontal and vertical directions. The multi-layered cage structure can effectively distribute the concentrated load from the main pump assembly, avoid single-point stress, sinking or swaying of the structure, and improve the overall support safety.

[0016] 2. By using a servo electric cylinder as the drive end, the screw jack used in the existing technology is eliminated, effectively preventing problems such as lag and low displacement accuracy caused by the structural gap of the screw jack. The design characteristics of the servo electric cylinder ensure the fine control of the device, so that the main pump assembly can maintain a stable posture during the lifting process. Attached Figure Description

[0017] The preferred embodiments will now be described in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of this application.

[0018] Figure 1 This is a schematic diagram of a nuclear power plant main pump installation and maintenance device equipped with a main pump assembly in one embodiment of this application; Figure 2 This is a schematic diagram of the overall structure of the nuclear power plant main pump installation and maintenance device in one embodiment of this application; Figure 3 This is a schematic diagram of the auxiliary support portion in one embodiment of this application; Figure 4 This is a schematic diagram of the support portion in one embodiment of this application; Figure 5 This is a partial structural schematic diagram of a nuclear power plant main pump installation and maintenance device in one embodiment of this application; Figure 6 This is a partial detail drawing of one embodiment of this application; Figure 7 This is a partial detail drawing of one embodiment of this application; Figure 8 This is a partial structural schematic diagram of a nuclear power plant main pump installation and maintenance device in one embodiment of this application; Figure 9 yes Figure 8 A diagram from another perspective; Figure 10 This is a schematic diagram of the structure of the electric cylinder bracket in one embodiment of this application.

[0019] Reference numerals: Main pump assembly 1; Main support structure 2; Chassis 21; Support column 22; Top crossbeam 23; Middle crossbeam 24; Support part 3; Auxiliary support part 31; Support component 311; Base plate 312; Base plate unit 3121; First reinforcing rib 3131; Second reinforcing rib 3132; Guide wheel 314; X-axis adjustment mechanism 41; Y-axis adjustment mechanism 42; Second adjustment mechanism 5; Servo electric cylinder 51; Electric cylinder bracket 52; Adaptor hole 520; Notch 521; Angle adjustment mechanism 6; Adjusting gear 61; First stroke disc 71; Second stroke disc 72; Third stroke disc 73; Rack 731; Support structure 740. Detailed Implementation

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the specific implementation methods of this application will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without creative effort.

[0021] To keep the drawings concise, each drawing only schematically shows the parts relevant to the application; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" can mean not only "only one" but also "more than one."

[0022] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0023] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0025] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] The main pump (also known as the main coolant pump) is a key piece of equipment in the primary loop system of a pressurized water reactor nuclear power plant. It primarily drives the circulation of reactor coolant between the reactor pressure vessel and the steam generator, thereby achieving efficient heat transfer from the nuclear reaction. The main pump is typically located inside the containment building of the reactor building. It has a complex structure, is heavy, and requires extremely high operational reliability. Its installation accuracy and stability directly affect the safe operation of the nuclear power unit.

[0027] During the construction of a nuclear power plant, the installation of the main pump is a core process with high technical requirements and operational difficulties. Since the main pump body typically weighs between 70 and 100 tons, its installation requires the use of specialized hoisting systems and installation devices to achieve positioning, lifting, and docking.

[0028] Existing installation and maintenance procedures generally include: first, the main pump assembly is hoisted by a hook and placed onto an installation and maintenance trolley. The trolley moves along a track or sliding mechanism to below the evaporator, and then, using a lifting mechanism, the main pump assembly is gradually raised to the position where it aligns with the pump casing. During this process, adjustments in the X, Y, and circumferential directions need to be made simultaneously to ensure precise alignment between the main pump flange hole and the pump casing mounting hole.

[0029] However, existing installation and maintenance equipment typically uses jacking methods such as screw jacks, with horizontal fine-tuning assisted by translation mechanisms. Due to the large overall weight of the main pump, the existing equipment has limited support rigidity, making it prone to swaying or displacement during jacking and adjustment, resulting in inaccurate flange alignment. Furthermore, the existing equipment may experience localized structural deformation or micro-displacement under the weight of the pump body, making it difficult to provide high-rigidity, high-precision stable support, thus affecting overall installation accuracy and safety.

[0030] In one embodiment, refer to the appendix to the specification. Figure 1 The nuclear power plant main pump installation and maintenance device provided in this application can ensure the stability and load-bearing capacity of the structure, thereby improving the operational safety during the installation process.

[0031] Reference manual attached Figure 1 and Figure 2 The nuclear power plant main pump installation and maintenance device provided in this application is applicable to the temporary support, lifting and adjustment of the nuclear main pump and its internal components (such as core pack) during the installation process, including a main support structure 2, a support part 3, a first adjustment mechanism and a second adjustment mechanism 5.

[0032] The main support structure 2 forms the basic framework of the device and is preferably made of steel. As shown in the attached figure, the main support structure 2 includes a chassis 21 and a plurality of vertically arranged support columns 22. The support columns 22 are fixed on the chassis 21, thereby forming an active space above the chassis 21 for the installation of the main pump assembly 1.

[0033] The support section 3 is a functional unit that directly contacts and supports the main pump assembly 1, used to achieve physical support and adjustment of the main pump components (e.g., the core package). Figure 3 As shown, the support part 3 includes an auxiliary support part 31, which is movably connected to multiple support columns 22, so that the support part 3 as a whole can move or rise and fall within the area defined by the main support structure 2 to meet the fine adjustment requirements of the installation position. Optionally, a guide wheel 314 or similar guide structure can be provided on the auxiliary support part 31 to assist the movement of the support part 3.

[0034] Specifically, the auxiliary support 31 includes several support members 311, which are arranged in a crisscross pattern to form a non-single-layer cage structure containing at least a first-layer frame and a second-layer frame, thus forming a three-dimensional spatial structure, which is beneficial to improving the structural stiffness and load distribution capacity. At the same time, the auxiliary support 31 and multiple support columns 22 form a movable connection, which can achieve positioning and movement within the trajectory defined by the main support structure 2.

[0035] The first adjustment mechanism is located on the support part 3 and is used to make fine adjustments to the support part 3 in the horizontal direction (e.g., the X-axis or Y-axis), so as to facilitate precise adjustment of the planar position of the main pump assembly 1 during installation and adapt to different docking requirements. The second adjustment mechanism 5 is located on the main support structure 2, and its output end is connected to the support part 3. It is used to drive the support part 3 to move up and down in the vertical direction (Z-axis) to realize the lifting of the main pump assembly 1 in the vertical direction.

[0036] Thus, the nuclear power main pump installation and maintenance device provided in this embodiment, through the auxiliary support part 31 with a non-single-layer cage structure, and in combination with the first adjustment mechanism and the second adjustment mechanism 5, significantly improves the load-bearing stability, position adjustment accuracy and structural adaptability of the installation device during the main pump installation process.

[0037] The support members 311, arranged in a crisscross pattern within the cage structure, provide the support section 3 with high rigidity and resistance to deformation in both the horizontal and vertical directions, making it more suitable for heavy equipment like the main pump assembly 1. The multi-layered cage structure effectively distributes the concentrated load from the main pump assembly 1, preventing single-point stress, sinking, or swaying, thus improving overall support safety. Furthermore, the cage structure reduces the likelihood of shaking during installation due to external interference or equipment eccentricity, contributing to improved installation accuracy.

[0038] Moreover, by adjusting the number of frame layers (adding more frame structures on top of the first and second frame layers) and the distribution of the supporting components 311, different models or sizes of main pump components, including core packs and pump casings, can be flexibly adapted. At the same time, the cage-like frame design has strong visibility and operability, which is conducive to the observation and adjustment by construction personnel and improves work efficiency.

[0039] It should be noted that, under normal circumstances, the supporting components 311 are fixedly connected by welding or detachable nodes. In addition, the frames of each layer can be reinforced by vertical or diagonal reinforcing bars.

[0040] In one embodiment, based on the above embodiments, to further improve the stability and control accuracy of the installation device during the lifting and lowering process of the main pump assembly 1, such as... Figure 8 and Figure 9 As shown, the second adjustment mechanism 5 includes multiple servo electric cylinders 51.

[0041] Specifically, the fixed ends of multiple servo cylinders 51 are all fixed to the bottom of the main support structure 2 and are reasonably spaced along the arrangement direction of the equipment, which can provide multi-point drive support for the auxiliary support part 31. The output ends of the multiple servo cylinders 51 are respectively set to correspond to the auxiliary support part 31, that is, each output end is connected to a different position point of the auxiliary support part 31. When the servo cylinder 51 is running, its output shaft drives the connection point to move synchronously or differentially, thereby realizing the stable lifting and lowering of the entire support part 3, and thus completing the vertical position adjustment of the main pump assembly 1 (such as the core package).

[0042] Compared with the screw jack structure commonly found in existing technologies, screw jacks generally suffer from problems such as large structural gaps, delayed load response, and low displacement accuracy. Especially in the lifting operation of large-mass, high-center-of-gravity equipment such as nuclear main pump core packages, the screw drive components inside the screw jack are prone to jamming, wear, or poor engagement under high loads. This not only affects the lifting stability but also poses potential risks to construction safety and installation accuracy.

[0043] As a closed-loop control drive element, the servo electric cylinder 51 has good response characteristics and small displacement accuracy, and can achieve high-frequency, small-step, and synchronous fine control. With the corresponding displacement feedback system (such as encoder, linear displacement sensor, etc.), it can monitor the lifting status of each contact point of the auxiliary support 31 in real time, ensuring that the support surface remains horizontal or changes according to the set posture during the lifting process, which significantly improves the control accuracy and operational stability of the entire device during the installation of the main pump assembly 1.

[0044] Furthermore, the application of the servo electric cylinder 51 makes the entire second adjustment mechanism 5 highly modular and maintainable, facilitating wiring, debugging, and replacement. When configured with a control system, it can also achieve intelligent functions such as controllable adjustment of lifting speed and adaptive load compensation, meeting the comprehensive requirements of nuclear power engineering for "smooth, gradual, and high-precision" installation of large equipment.

[0045] Based on the above embodiments, in one embodiment, such as Figure 3 As shown, the auxiliary support 31 also includes a base plate 312 and reinforcing ribs. The base plate 312 is located on the top layer of the cage structure to form a support interface for the mounting device and the main pump assembly 1 bracket. The base plate 312 can be made of steel or composite materials, with good flatness and rigidity, to distribute the gravitational load of the main pump assembly 1 to the cage structure. In addition, in specific scenarios, the base plate 312 can be equipped with position detection devices, adjusting bolts, etc., to achieve fine adjustment of the attitude or height of the main pump assembly 1, enhancing its adaptability.

[0046] The reinforcing ribs are used to enhance the overall structural strength and stability of the auxiliary support 31. At least some of the reinforcing ribs are installed across the support members 311 between the first and second layer frames, forming a three-dimensional, interlocking reinforcement system. These reinforcing ribs not only restrain lateral displacement in the horizontal direction, but also improve the compressive strength and resistance to local buckling of the entire cage structure in the vertical direction.

[0047] Understandably, during the installation of nuclear power plant main pumps, the main pump assembly 1 (such as the core package) is large in mass and complex in structure, and requires extremely high installation accuracy and stability. Traditional structures are prone to structural deformation, uneven stress, or localized subsidence during the lifting and holding process, which seriously affects the installation effect. By setting the aforementioned base plate 312 and reinforcing ribs in the auxiliary support 31, the supporting structure forms a stable upper platform and a spatial rigid frame, which can achieve uniform support and stable force transmission under large loads, effectively improving the safety and accuracy of the installation process.

[0048] In some embodiments, the base plate 312 can be a steel plate with an opening for mounting the main pump assembly 1. The steel plate is fixed to the top of the cage structure by bolts or welding. Multiple points on the lower part of the steel plate are connected to the main nodes of the lower frame by diagonal reinforcing ribs to form a high-strength support unit. Depending on the actual load requirements, the reinforcing ribs can be shaped steel, channel steel, or welded steel bars.

[0049] For further details, please refer to the instruction manual appendix. Figure 3The substrate 312 includes multiple substrate units 3121. The multiple substrate units 3121 can be combined by means of tenon, bolt, welding or other means to form the overall structure of the substrate 312. Of course, the substrate 312 can also be formed by integral molding. No specific restrictions are imposed on it in this application.

[0050] Alternatively, the auxiliary support 31 may also include an elastic support, which may be disposed between the base plate 312 and the cage structure, or at several key stress points below the base plate 312. The elastic support may be a spring assembly, a rubber damping pad, or a flexible structural component, used to provide buffering, vibration absorption, and flexible adjustment capabilities during the installation or fine-tuning of the main pump assembly 1.

[0051] Among them, the stiffeners provide static structural strength and resistance to deformation, mainly used to bear concentrated loads during the installation process, ensuring the overall rigidity and stability of the entire cage structure; the elastic supports provide dynamic flexibility and adjustment capabilities, mainly used to absorb deviations and compensate for minor displacements during jacking or installation, avoiding equipment damage caused by positioning errors or mechanical clearances.

[0052] In one embodiment, the cage structure in the auxiliary support 31 is a three-dimensional structure composed of two interconnected frames, namely the first frame and the second frame mentioned above.

[0053] The first and second frame layers are connected by several vertically arranged support members 311, forming a stable three-dimensional spatial frame, thus giving the entire cage structure a cube-like geometric shape. This design can significantly improve the overall compressive and deformation resistance of the structure, ensuring good stability and load distribution when supporting the heavy main pump assembly 1.

[0054] Furthermore, the first-layer frame is connected to the substrate 312, and the outer edge of the substrate 312 extends outward relative to the outer edge of the first-layer frame, forming several cantilever ends. This cantilever design locally widens the substrate 312 in terms of size and strength, thereby providing a larger effective support range, which is beneficial for adapting to the installation requirements of the main pump assembly 1 with different sizes and center of gravity arrangements.

[0055] Meanwhile, one end of some of the reinforcing ribs is connected between the support member 311 of the first layer frame and the support member 311 of the second layer frame, forming a stable stiffening path in the vertical direction; while the first end of another part of the reinforcing ribs is connected to the cantilever end of the base plate 312, and the other end is connected to the support member 311 at the corresponding position of the second layer frame, forming an inclined reinforcing structure that extends obliquely downward from the outer edge of the upper layer.

[0056] Understandably, in this embodiment, the inclined reinforcement structure not only provides the necessary shear and bending support to the cantilever end, but also helps to effectively transfer the eccentric load it bears to the lower frame, achieving a smooth transition of load distribution and significantly enhancing the safety and reliability of the installation device under actual working conditions.

[0057] In some embodiments, one or more reinforcing ribs are provided at each edge of the frame. For example, when the frame is a rectangular or square structure with four edges, the reinforcing ribs can be provided at each of the four edges, so that a rigid reinforcement part is formed on each side. This arrangement not only improves the bending and torsional resistance of each edge, but also effectively suppresses problems such as local deflection and overall warping that may occur when the structure supports the main pump assembly 1.

[0058] Based on the above, the stiffeners in the cage structure are symmetrically distributed. The inclined stiffeners are defined as first stiffeners 3131, and the non-inclined stiffeners, typically parallel to the frame edge, are defined as second stiffeners 3132. Specifically, the first stiffeners 3131 are symmetrically arranged on two opposite sides of the cage structure; while the second stiffeners 3132 are symmetrically arranged on the other two sides of the cage structure. This symmetrical arrangement allows for even load distribution and directional decomposition when the structure is under stress, preventing structural deformation, warping, or even damage caused by excessive local stress.

[0059] In addition, in this plan, such as Figure 5 , Figure 8 As shown, the second adjustment mechanism 5 contains at least four servo cylinders 51, preferably arranged at the four corners. The servo cylinders 51 are respectively located on two sides of the cage structure with first reinforcing ribs 3131. The fixed ends of the multiple servo cylinders 51 are fixed to the bottom of the main support structure 2, and their output ends are correspondingly connected to the upper base plate 312. Thus, during the operation of the servo cylinders 51, their output ends can directly drive the base plate 312 to rise and fall vertically, thereby driving the entire auxiliary support 31 to complete height adjustment.

[0060] It should be noted that, since the servo electric cylinders 51 are arranged symmetrically on both sides of the first reinforcing rib 3131, the balance during the lifting process can be maintained, significantly reducing the asynchrony problem caused by multi-point drive. Optionally, based on the content of this solution, the number of servo electric cylinders 51 can also be increased or adjusted according to the weight of the main pump assembly 1 it supports and the installation accuracy requirements, and can be synchronously arranged in conjunction with the arrangement positions of multiple first reinforcing ribs 3131 and second reinforcing ribs 3132.

[0061] Based on the above embodiments, the second adjustment mechanism 5 further includes an electric cylinder bracket 52 for structurally fixing multiple servo electric cylinders 51. Specifically, the electric cylinder bracket 52 is disposed on the main support structure 2 and can be a horizontally arranged plate or frame structure. Its two ends are respectively connected to the support column 22 of the main support structure 2 by welding, screwing or adding limiting components to form a stable cross-support.

[0062] like Figure 10 As shown, the main body of the electric cylinder bracket 52 has several adapter holes 520 for positioning and installation of the servo electric cylinder 51. The number of adapter holes 520 corresponds one-to-one with the number of servo electric cylinders 51. After passing through their corresponding adapter holes 520, the multiple servo electric cylinders 51 located on the same side of the cage structure are relatively fixed with the main support structure 2. This ensures that the output stability and force transmission accuracy of the servo electric cylinder 51 are effectively guaranteed when it is working, avoiding problems such as displacement, loosening, and misalignment during operation.

[0063] Furthermore, the electric cylinder bracket 52 is also provided with a notch 521 at a corresponding position to avoid interference with the first reinforcing rib 3131 during the lifting process. The number, size, and shape of the notch 521 can be designed according to the distribution position and movement path of the first reinforcing rib 3131, and can adopt structural forms such as arc cuts, rectangular notches 521 or trapezoidal grooves, so as to ensure that the first reinforcing rib 3131 can pass smoothly during the lifting process without affecting the overall strength and installation function of the electric cylinder bracket 52, and avoid jamming, squeezing or stroke error caused by structural interference.

[0064] In actual operation, multiple servo electric cylinders 51 work together to drive the base plate 312 to move up and down, while the first reinforcing rib 3131 rises and falls synchronously. The notch 521 of the electric cylinder bracket 52 forms a guide path, which not only ensures the stable vertical movement of the auxiliary support 31, but also effectively prevents swaying or wobble caused by load offset or push rod clearance. The first reinforcing rib 3131 may be equipped with a low-friction coating or other structures to reduce motion resistance and improve structural lifespan.

[0065] Through the configuration of this embodiment, on the one hand, the electric cylinder bracket 52 realizes the unified layout and rigid fixation of the servo electric cylinder 51, improving the synchronization and response accuracy of the second adjustment mechanism 5 in the working state; on the other hand, the cooperation between the first reinforcing rib 3131 and the notch 521 of the electric cylinder bracket 52 can effectively limit the lateral displacement of the auxiliary support part 31, ensuring that the auxiliary support part 31 always runs stably along the set path when lifting and lowering.

[0066] In one embodiment, the nuclear power plant main pump installation and maintenance device provided in this application, such as Figure 8 and Figure 9 As shown, the main support structure 2 also includes a top crossbeam 23. The top crossbeam 23 is positioned between every two adjacent or opposite support columns 22, connecting the support columns 22 horizontally, effectively enhancing the lateral strength and deformation resistance of the overall structure. During heavy-load operation and start-up / shutdown of the main pump assembly 1, the top crossbeam 23 can share some of the load impact, improving the structural rigidity and durability of the installation device.

[0067] Building upon this, in a further optimized design, a central crossbeam 24 can also be installed at the middle position of the support column 22. This central crossbeam 24, together with the aforementioned top crossbeam 23 and the bottom foundation connection structure (chassis 21), forms a multi-layered lateral support system. This allows the entire main support structure 2 to be segmented and reinforced vertically, forming a triple lateral structural support from bottom to top, including the chassis 21, the central crossbeam 24, and the top crossbeam 23. In practical applications, this multi-layered support system can effectively resist lateral shear forces and structural deformation caused by the main pump's mass and vibration, improving structural stability and operational reliability. Similarly, auxiliary crossbeams can also be installed at the lower middle or upper middle positions of the support column 22 to further enhance structural stability.

[0068] For example, in a specific embodiment, the electric cylinder bracket 52 located in the middle of the support column 22 can serve both structural connection and support functions. While enabling the servo electric cylinder 51 to be installed and fixed, it can also act as a central crossbeam 24, achieving multiple uses with one component. Furthermore, if the electric cylinder bracket 52 cannot meet all structural strength requirements, an additional dedicated central crossbeam 24 can be set up to achieve stable lateral constraint between the support columns 22.

[0069] With the above configuration, the main support structure 2 forms a triple stable structure in the horizontal direction, and in the vertical direction, it is connected by multiple support columns 22 and servo electric cylinders 51 and other vertical support components to form a complete support system. This not only effectively avoids the problem of local deformation caused by concentrated force, but also evenly distributes the load in multiple directions, improving the structure's impact resistance and service life.

[0070] In one embodiment, please refer to the appendix to the specification. Figure 4 The support part 3 also includes a stroke plate disposed on the upper part of the auxiliary support part 31. The upper part of the stroke plate is provided with a receiving structure 740. The receiving structure 740 can be customized according to the relative installation position of the main pump assembly 1. It can be set as a positioning protrusion, positioning column or other structure to achieve precise docking and installation fixation with the main pump assembly 1, thereby ensuring that the main pump assembly 1 always maintains a stable and reliable stress state during the entire lifting or fine adjustment process, and preventing equipment damage or displacement caused by unstable docking surface, uneven stress or deformation.

[0071] The lower part of the stroke plate is connected to the top structure (such as the base plate 312) or the upper frame of the cage structure of the auxiliary support part 31. When the auxiliary support part 31 moves up and down under the drive of the second adjustment mechanism 5, the stroke plate can move synchronously, thereby driving the main pump assembly 1 connected to it to move up and down as a whole.

[0072] In specific implementations, the stroke plate can be made of high-strength steel, aluminum alloy or composite material. In addition, in other optional embodiments, the stroke plate design can also incorporate a position detection sensor, displacement encoder or pressure sensing device for real-time monitoring of the attitude, weight distribution or installation status of the main pump assembly 1.

[0073] Based on the above embodiments, such as Figure 6 and Figure 7 As shown, the first adjustment mechanism includes an X-axis adjustment mechanism 41 and a Y-axis adjustment mechanism 42. The stroke disk includes a first stroke disk 71 and a second stroke disk 72. The first stroke disk 71 and the second stroke disk 72 are arranged in a stacked manner along the vertical direction. The X-axis adjustment mechanism 41 is at least corresponding to the first stroke disk 71 and is used to realize the movement of the first stroke disk 71 in the X direction. The Y-axis adjustment mechanism 42 is at least opposite to the second stroke disk 72 and is used to realize the movement of the second stroke disk 72 in the Y direction.

[0074] Optionally, the X-axis adjustment mechanism 41 and Y-axis adjustment mechanism 42 in this embodiment can be linearly driven by hydraulic cylinders, electric push rods, translation screw mechanisms, etc. For example, when the first stroke disk 71 is set below the second stroke disk 72, the X-axis adjustment mechanism 41 can drive the first stroke disk 71 to move, thereby driving the upper second stroke disk 72 and the main pump assembly 1 to adjust the horizontal position.

[0075] In one embodiment, the nuclear power plant main pump installation and maintenance device further includes an angle adjustment mechanism 6. The stroke plate includes a first stroke plate 71, a second stroke plate 72, and a third stroke plate 73 stacked vertically from bottom to top, which together constitute a receiving system for multi-degree-of-freedom adjustment of the main pump assembly 1. Preferably, the first stroke plate 71, the second stroke plate 72, and the third stroke plate 73 all have a hollow structure in the middle, which allows the bottom of the main pump assembly 1 to pass through and fall into its central area, ensuring that the main pump assembly 1 is in a stable and controllable supported state in the vertical direction.

[0076] Specifically, the first stroke disk 71 is driven by the X-axis adjustment mechanism 41 to achieve fine adjustment of the horizontal X-axis, the second stroke disk 72 is driven by the Y-axis adjustment mechanism 42 to achieve fine adjustment of the position on the Y-axis, and the third stroke disk 73 is driven by the angle adjustment mechanism 6 to achieve angle rotation adjustment around the vertical axis (Z-axis).

[0077] In this embodiment, the type and arrangement of the angle adjustment mechanism 6 are not limited. The angle adjustment mechanism 6 can adopt a servo-driven rotary platform structure, a worm gear mechanism, etc., as long as it forms a relative cooperation relationship with the third stroke disk 73 and can drive the third stroke disk 73 and related components to achieve angle deflection. For example, in the appendix of this application Figure 6 and Figure 7 In the middle, the outer edge of the third stroke disk 73 is provided with a rack 731 (which can be a ring, semi-ring or other contours, as long as it can be fixed to the outer edge of the stroke disk). The rack 731 has several mating teeth on its tooth surface. Correspondingly, the angle adjustment mechanism 6 also includes a rotatable adjustment gear 61. The two mesh with each other, so that when the adjustment gear 61 rotates, it drives the third stroke disk 73 to rotate synchronously. And by adjusting the forward and reverse rotation of the adjustment gear 61, the rotation state of the third stroke disk 73 can be adjusted synchronously.

[0078] In an optional implementation, there may be multiple angle adjustment mechanisms 6, which are symmetrically arranged around the third stroke disk 73 to improve the accuracy and stability of angle adjustment. They also provide redundancy, so that if one of the angle adjustment mechanisms 6 is damaged, other mechanisms can be used to rotate the third stroke disk 73.

[0079] In practical applications, the rotation center of the third stroke disk 73 can be aligned with the center of gravity of the main pump assembly 1 to reduce the torque load during the adjustment process. In addition, the third stroke disk 73 can also be equipped with an angle sensor or encoder module to realize real-time monitoring and feedback control of the angle adjustment status.

[0080] In one embodiment, there are three configuration methods between the stroke discs or their corresponding components. In the first method, the material of the relative contact end face between the first stroke disc 71 and the second stroke disc 72 is a self-lubricating material. In the second method, the material of the relative contact end face between the second stroke disc 72 and the third stroke disc 73 is a self-lubricating material. In the third method, the material of the contact end face between the first stroke disc 71 and the auxiliary support part 31 is a self-lubricating material. The above three configuration methods can be combined arbitrarily or used independently to adapt to the needs under different working conditions.

[0081] In a preferred embodiment, the self-lubricating material can be a polytetrafluoroethylene composite layer, a graphite-based coating, or other materials with a low coefficient of friction and excellent pressure-bearing properties. In specific designs, a silicone-based grease can also be applied by surface coating to further reduce the difference between static and dynamic transitions and the dynamic coefficient of friction, so that the sliding contact structure has more consistent and controllable frictional characteristics during startup, transition, and stable operation.

[0082] By setting the above self-lubricating structure, the starting resistance of each sliding contact part can be effectively reduced, and unstable factors such as motion lag caused by friction can be reduced, thereby ensuring that the adjustment action between each layer of stroke disc has higher precision and response consistency.

[0083] Understandably, on the other hand, the self-lubricating structure can adaptively perform minute displacement compensation when the supporting structure experiences minor external force disturbances (such as main pump weight shift, vibration impact, environmental thermal expansion and contraction, etc.) without driving the active adjustment mechanism (such as X-axis adjustment mechanism 41 and Y-axis adjustment mechanism 42). This passive adjustment capability can significantly improve the support stability and installation adaptability of the main pump assembly 1, which is beneficial for supporting high-precision fine-tuning conditions.

[0084] In addition, the lubrication layer helps extend the service life of structural components, reduce wear rate, and improve the overall reliability and maintenance cycle of the device.

[0085] Furthermore, in one embodiment, the nuclear power plant main pump installation and maintenance device also includes an opening and closing structure. The opening and closing structure is provided on at least one side of the main support structure 2 and the support portion 3, thereby allowing the main support structure 2 and the support portion 3 to form an openable or closable opening on the side. Through this opening, the main pump assembly 1 can be installed laterally into the installation device. The opening and closing structure can take the form of a mechanical hinge, a sliding guide rail device, or an electrically operated opening assembly, etc., and no specific limitations are imposed in this embodiment.

[0086] By designing an opening and closing structure on the side, on the one hand, the installation path and process steps of the main pump assembly 1 can be significantly simplified. Especially in situations where the equipment installation space is limited or precise positioning is required, side installation has higher operational feasibility. On the other hand, during the later maintenance or replacement of the equipment, the side opening can be quickly opened through the opening and closing structure, which facilitates the maintenance work of technicians and improves maintenance efficiency.

[0087] It should be noted that the above embodiments can be freely combined as needed. The above are merely preferred embodiments of this application. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A nuclear power plant main pump installation and maintenance device, characterized in that, include: The main support structure is a steel structure, including a chassis and multiple support columns extending in a vertical direction. The multiple support columns are respectively fixed to one side of the chassis, thereby jointly enclosing and forming an activity space. The support section, used to support the main pump assembly, has an auxiliary support section, which includes a plurality of crisscrossing support members. The plurality of support members form a non-single-layer cage structure including at least a first layer frame and a second layer frame. The auxiliary support section is also movably connected to a plurality of support columns. A first adjustment mechanism is provided on the support portion for adjusting the position of the support portion in the horizontal direction. A second adjustment mechanism is provided on the main support structure, and the output end of the second adjustment mechanism is correspondingly provided with the support part, for realizing the vertical position adjustment of the support part, so that the support part can rise and fall along the trajectory of the active space when carrying the main pump assembly.

2. The nuclear power plant main pump installation and maintenance device according to claim 1, characterized in that, The second adjustment mechanism includes multiple servo electric cylinders; The fixed ends of the multiple servo electric cylinders are all fixed to the bottom of the main support structure, and the output ends of the multiple servo electric cylinders are respectively arranged corresponding to the auxiliary support part. When the servo electric cylinders are running, the multiple output ends drive the auxiliary support part to generate displacement, so as to realize the lifting and lowering of the main pump assembly.

3. The nuclear power plant main pump installation and maintenance device according to claim 2, characterized in that, The auxiliary support also includes a base plate and reinforcing ribs, with the base plate disposed on the top layer of the cage structure. At least some of the reinforcing ribs are disposed between the supporting members in the first layer frame and the supporting members in the second layer frame to improve the structural strength.

4. The nuclear power plant main pump installation and maintenance device according to claim 3, characterized in that, The cage structure includes two connected frames, namely the first frame and the second frame, which are connected by the vertically arranged support members, so that the cage structure is cubic in shape. The first layer frame is connected to the substrate, and the outer edge of the substrate extends beyond the outer edge of the first layer frame to form a corresponding cantilever end; In the auxiliary support section, one end of a portion of the reinforcing ribs is connected between the support member of the first layer frame and the support member of the second layer frame; the first end of the remaining portion of the reinforcing ribs is connected to the cantilever end, and the other end is connected to the corresponding support member of the second layer frame, so that this portion of the reinforcing ribs is inclined.

5. The nuclear power plant main pump installation and maintenance device according to claim 4, characterized in that, The reinforcing ribs are symmetrically distributed, wherein the reinforcing ribs that are inclined are the first reinforcing ribs, and the reinforcing ribs that are not inclined are the second reinforcing ribs. The first reinforcing ribs are symmetrically arranged on opposite sides of the cage structure, and the second reinforcing ribs are symmetrically arranged on the other two sides of the cage structure. The number of servo cylinders is at least four. The servo cylinders are respectively distributed on the two sides of the cage structure with the first reinforcing rib. The output end of each servo cylinder is correspondingly arranged with the base plate. When the servo cylinders are running, the output ends of the multiple servo cylinders drive the base plate to rise and fall, thereby realizing the raising and lowering of the auxiliary support part.

6. The nuclear power plant main pump installation and maintenance device according to claim 5, characterized in that, The second adjustment mechanism also includes an electric cylinder bracket, which is provided with an adapter hole. The servo electric cylinders located on the same side pass through the corresponding adapter hole of the electric cylinder bracket to form a relatively fixed relationship. The two ends of the electric cylinder bracket are respectively fixed to the main support structure. The electric cylinder bracket has a notch adapted to the first reinforcing rib. When the auxiliary support part is raised and lowered, the first reinforcing rib moves within the notch.

7. The nuclear power plant main pump installation and maintenance device according to any one of claims 1-6, characterized in that, The support portion also includes a stroke plate, the upper part of which is provided with a receiving structure for connecting at least part of the main pump assembly. The lower part of the stroke plate is connected to the top of the cage structure to synchronously drive the main pump assembly to move when the cage structure moves.

8. The nuclear power plant main pump installation and maintenance device according to claim 7, characterized in that, The first adjustment mechanism includes an X-axis adjustment mechanism and a Y-axis adjustment mechanism. The stroke plate includes a first stroke plate and a second stroke plate to jointly connect to the main pump assembly. The first stroke plate and the second stroke plate are stacked in the vertical direction. The X-axis adjustment mechanism is at least corresponding to the first travel disk and is used to realize the movement of the first travel disk in the X direction. The Y-axis adjustment mechanism is at least opposite to the second travel disk and is used to realize the movement of the second travel disk in the Y direction.

9. The nuclear power plant main pump installation and maintenance device according to claim 8, characterized in that, The nuclear power main pump installation and maintenance device also includes an angle adjustment mechanism, and the stroke plate also includes a third stroke plate. The first stroke plate, the second stroke plate and the third stroke plate are stacked in sequence in a vertical direction from bottom to top, and all of them have a central hollow design to support the main pump assembly. The angle adjustment mechanism is engaged with the third stroke plate to enable the rotation of the third stroke plate.

10. The nuclear power plant main pump installation and maintenance device according to claim 9, characterized in that, The materials of the relative contact surfaces of the first and second stroke discs are self-lubricating materials; And / or, The materials of the relative contact surfaces of the second and third stroke discs are self-lubricating materials; And / or, The material of the relative contact surfaces of the first travel disc and the auxiliary support is a self-lubricating material.

11. The nuclear power plant main pump installation and maintenance device according to any one of claims 1-6 and 8-10, characterized in that, The main support structure also includes a top crossbeam, which is disposed between each two adjacent or opposite support columns to enhance the strength of the main support structure. And / or, The nuclear power plant main pump installation and maintenance device also includes an opening and closing structure. The opening and closing structure is provided on at least one side of the main support structure and the support portion, so that the main support structure and the support portion can form an opening on the side through the opening and closing structure, thereby allowing the main pump assembly to be installed into the nuclear power plant main pump installation and maintenance device through the opening.

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