Bushing dismounting and mounting device

Abstract

The application belongs to the technical field of nuclear power maintenance, and particularly relates to a bearing bush dismounting and maintenance device. The bearing bush dismounting and maintenance device comprises a lifting mechanism, a fixing mechanism and a rotating mechanism. The fixing mechanism is used for connecting the rotor and the bearing bush of the motor. The lifting mechanism is used for driving the rotor and the bearing bush to lift, so that the bearing bush is separated from the insulating pad in the bearing bush seat. The rotating mechanism is connected with the fixing mechanism, so as to drive the fixing mechanism to rotate, and then drive the bearing bush to rotate around the axis of the rotor. Before driving the bearing bush to rotate, the rotating mechanism lifts the bearing bush by the lifting mechanism, so that a gap is formed between the bearing bush and the insulating pad in the bearing bush seat, the scratching and rubbing of the insulating pad and the bearing bush is reduced, the damage of the insulating pad is reduced, the subsequent manpower and working hours for re-pasting and equipment running-in of the insulating pad are reduced, the original matching precision and stress state of the bearing bush are maintained, and the stability of the operation of the feed water pump motor is improved.

Description

Technical Field

[0001] This application belongs to the field of nuclear power plant maintenance technology, and in particular relates to a bearing assembly and disassembly maintenance device. Background Technology

[0002] Feedwater pumps are important equipment in the conventional island of a nuclear power plant, and their operating status directly determines the safety and stability of the secondary loop system. The motor rotor of the feedwater pump is usually supported by bearing bushes to ensure the smooth operation of the feedwater pump motor.

[0003] The water pump motor employs a self-aligning spherical bearing structure, with the outer surface of the bearing bush being spherical, precisely fitting with the inner surface of the bearing bush housing. During operation, the rotor of the water pump motor undergoes a certain degree of deflection due to load changes and temperature fluctuations. The spherical bearing bush can adaptively compensate for the rotor's deformation deviation, preventing problems such as rotor jamming and stress concentration, thus ensuring stable operation of the water pump motor. However, the motor operation easily generates shaft current, which can readily cause electrolytic corrosion of the bearing bush, damage the fit precision, and lead to water pump motor failure. Therefore, insulating pads are typically attached to the mating surfaces of the bearing bush housing and the bearing bush to isolate and block shaft current, protecting the bearing bush.

[0004] Traditional manual methods are commonly used for the disassembly and maintenance of bearing bushes (e.g., lower bearing bushes). During maintenance, equipment is first used to lift the rotor, separating it from the bearing bush. Then, using slings and manual pushing, pulling, and rotating, the bearing bush is rotated out of its bearing seat, completing the disassembly. However, the insulating pads are thin, fragile, and have extremely poor scratch resistance. During manual disassembly and assembly, it is impossible to precisely control the force and trajectory of the work. The bearing bushes are prone to rubbing against the insulating pads during rotation and pushing, causing scratches and damage. Damaged insulating pads require significant manpower and time for re-attaching and break-in, greatly increasing maintenance costs and unit downtime. Furthermore, the break-in accuracy of newly attached insulating pads is difficult to guarantee, easily altering the bearing bush fit accuracy and stress state, leading to increased motor vibration and decreased stability, which is detrimental to improving the operational safety of feedwater pump motors and nuclear power plant units. Summary of the Invention

[0005] The purpose of this application is to provide a bearing assembly and repair device that can reduce the risk of damage to the bearing insulation pad during bearing repair.

[0006] To achieve the above objectives, the technical solution adopted in this application is: a bearing assembly and repair device, which includes a lifting mechanism, a fixing mechanism, and a rotating mechanism. The fixing mechanism is used to connect the rotor of the motor and the bearing; the lifting mechanism is used to drive the rotor and the bearing to lift and lower, so that the bearing is separated from the insulating pad in the bearing seat; the rotating mechanism is connected to the fixing mechanism to drive the fixing mechanism to rotate, thereby driving the bearing to rotate around the axis of the rotor.

[0007] Optionally, the fixing mechanism includes a mating part and a fixing part, wherein the two ends of the mating part mate with the two ends of the bearing bush to form an annular structure for the rotor to pass through, and the fixing part connects the mating part and the bearing bush.

[0008] Optionally, the fastener is a ring clamp, which is fitted over the ring structure.

[0009] Optionally, the outer peripheral surface of the mating part is provided with a receiving groove for accommodating the annular clamp.

[0010] Optionally, the lifting mechanism includes a worm gear lifting mechanism for lifting the rotor of the drive motor.

[0011] Optionally, the bearing removal and maintenance device also includes a lifting seat, the lifting end of the lifting mechanism is connected to the lifting seat to drive the lifting seat to rise and fall, and the lifting seat is provided with a V-shaped groove for accommodating the rotor.

[0012] Optionally, the bearing assembly and maintenance device also includes a moving mechanism, the moving end of which is connected to a lifting mechanism to drive the lifting mechanism to move along a first direction, which is perpendicular to the rotor axis and the lifting direction of the lifting mechanism.

[0013] Optionally, the moving mechanism includes a mounting base, a guide rail, a slider, and a telescopic component. The guide rail is mounted on the mounting base, the slider is slidably connected to the guide rail and connected to the lifting mechanism, and the telescopic end of the telescopic component is connected to the slider to drive the slider to slide along a first direction.

[0014] Optionally, the telescopic component includes a screw, a nut, and a fixed base. The screw is rotatably mounted on the mounting base, the nut is threadedly connected to the screw, and the lifting mechanism, the nut, and the slider are all connected to the fixed base.

[0015] Optionally, the rotating mechanism includes a winch and a connecting rope, the connecting rope being connected to the fixed mechanism and wound around the winch to drive the fixed mechanism to rotate about the axis of the rotor.

[0016] Optionally, the rotating mechanism also includes a pulley and a first mounting bracket for mounting on the rotor, the pulley being connected to the first mounting bracket and a connecting rope being wound around the pulley.

[0017] Optionally, the bearing assembly and maintenance device includes a detection mechanism for detecting the rotor position. The detection mechanism includes a first detection element, a second detection element, and a second mounting bracket mounted on the rotor. The first detection element is mounted on the second mounting bracket to measure the rotor position in a first direction. The second detection element is mounted on the second mounting bracket to measure the rotor position in the rotor lifting direction. The first direction is perpendicular to the rotor's axial direction and the rotor's lifting direction.

[0018] The bearing assembly and repair device provided in this application has at least one of the following technical effects: When using the bearing assembly and repair device, the rotor and bearing are first connected by a fixing mechanism. Then, the lifting mechanism is activated to drive the rotor and bearing upward, separating the bearing from the bearing seat and creating a gap between the insulating pad inside the bearing and bearing seat. Subsequently, the rotating mechanism is activated, driving the fixing mechanism to rotate as a whole, causing the bearing to rotate around the axis of the rotor, gradually rotating the bearing out of the bearing seat, and completing the bearing disassembly operation. During this process, the fixing mechanism connects the bearing and the rotor, allowing the lifting mechanism to lift the bearing before the rotating mechanism drives the bearing to rotate, creating a gap between the bearing and the insulating pad. This reduces friction between the insulating pad and the bearing, reduces the occurrence of insulating pad damage, and reduces the manpower and time required for subsequent insulating pad re-attaching and equipment break-in. It also helps maintain the original fit accuracy and stress state of the bearing, improving the stability of the feedwater pump motor operation. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 The diagram shows the structure of a rotor, bearing, bearing seat, and bearing disassembly and maintenance device provided in some embodiments of this application.

[0021] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0022] Figure 3 for Figure 1 Schematic diagram of the structure of the bearing bush, bearing bush seat, detection mechanism, fixing mechanism and rotating mechanism. Figure 1 .

[0023] Figure 4 for Figure 1 Schematic diagram of the structure of the bearing bush, bearing bush seat, detection mechanism, fixing mechanism and rotating mechanism. Figure 2 .

[0024] Figure 5 for Figure 1 An exploded view of the bearing bush, bearing bush seat, detection mechanism, fixing mechanism and rotating mechanism.

[0025] Figure 6 for Figure 1 The diagram shows the structure of the lifting mechanism, the moving mechanism, and the lifting seat.

[0026] The following are the labeling elements in the figure: 100. Bearing assembly and maintenance device; 110. Lifting mechanism; 111. Worm gear lifting mechanism; 112. Guide rod; 113. Guide sleeve; 120. Fixing mechanism; 121. Mating parts; 1211. Receiving groove; 122. Connecting shaft; 130. Rotating mechanism; 131. Winch; 132. First mounting bracket; 133. Pulley; 140. Lifting seat; 1401. V-groove; 141. Fixing base ; 142, stop block; 150, moving mechanism; 151, mounting base; 152, guide rail; 153, slider; 154, telescopic component; 1541, screw; 1542, nut; 1543, fixed base; 160, detection mechanism; 161, first detection piece; 162, second detection piece; 163, second mounting bracket; 170, electrical control box; 200, rotor; 300, bearing; 400, bearing seat. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] In the description of the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" and "second" may explicitly or implicitly include at least one of that feature.

[0029] In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise expressly and specifically limited.

[0030] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] In the description of this application, it should be understood that the terms "inner", "outer", "side", "upper", "bottom", "front", "rear", etc., indicating the orientation or positional relationship 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.

[0033] In the description of this application, it should be noted that the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0034] It should also be noted that in the embodiments of this application, the same reference numerals are used to represent the same component or part. For the same part in the embodiments of this application, the reference numerals may only be used to mark one part or component as an example. It should be understood that the reference numerals are also applicable to other identical parts or components.

[0035] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0036] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0037] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0038] Perpendicularity: The perpendicularity defined in this application is not limited to an absolute perpendicular intersection (with an included angle of 90°). It is permissible for non-absolute perpendicular intersections caused by factors such as assembly tolerances, design tolerances, and structural flatness. It is permissible for errors within a small angular range, such as an assembly error range of 80° to 100°, which can all be understood as a perpendicular relationship.

[0039] Parallelism: The parallelism defined in this application is not limited to absolute parallelism (with an included angle of 0°). It is permissible for non-absolute parallelism due to factors such as assembly tolerances, design tolerances, and structural flatness. It is permissible for errors within a small angular range, such as an assembly error range of -10° to 10°, which can all be understood as a parallel relationship.

[0040] In this embodiment, the bearing shell disassembly and maintenance device can be used to install the bearing shell onto the bearing shell seat, or to remove the bearing shell from the bearing shell seat. The bearing shell can be an upper bearing shell or a lower bearing shell.

[0041] For ease of explanation, the following explanation will take the lower bearing as an example, with the lower bearing being removed from the bearing housing.

[0042] The following combination Figures 1-6 The following describes the bearing assembly and repair device according to an embodiment of this application. The first direction can be referred to as the Y-direction, the rotor's axial direction as referred to the X-direction, and the lifting direction of the lifting mechanism as referred to the Z-direction. In the accompanying drawings, the Z-axis represents the up-down direction, with the positive Z-axis indicating up and the negative Z-axis indicating down. The X-axis represents the left-right direction, with the positive X-axis indicating right and the negative X-axis indicating left. The Y-axis represents the front-back direction, with the positive Y-axis indicating back and the negative Y-axis indicating front.

[0043] like Figure 1 and Figure 2 As shown, in some embodiments, the bearing assembly and maintenance device 100 includes a lifting mechanism 110, a fixing mechanism 120, and a rotating mechanism 130. The fixing mechanism 120 is used to connect the rotor 200 of the motor and the bearing 300. The lifting mechanism 110 is used to drive the rotor 200 and the bearing 300 to lift and lower, so that the bearing 300 is separated from the insulating pad in the bearing seat 400. The rotating mechanism 130 is connected to the fixing mechanism 120 to drive the fixing mechanism 120 to rotate, thereby driving the bearing 300 to rotate around the axis of the rotor 200.

[0044] The fixing mechanism 120 is a component used to connect the bearing shell 300 and the rotor 200. The bearing shell 300 and the rotor 200 can be connected by means of clamping, bolting, snap-fitting, etc.

[0045] The fixing mechanism 120 can be adapted to the semi-circular bearing bush 300. The fixing mechanism 120 and the bearing bush 300 can form a ring structure to be sleeved and fixed outside the rotor 200, so that the bearing bush 300 and the rotor 200 form a relatively fixed integral structure, so that the bearing bush 300 can rise and fall together with the rotor 200, thereby separating from the bearing bush seat 400.

[0046] The fixing mechanism 120 can be made of high-strength alloy material, with structural strength suitable for maintenance conditions, and can maintain the connection between the bearing 300 and the rotor 200 during lifting and rotating operations.

[0047] The lifting mechanism 110 is a component used to drive the rotor 200 and the bearing 300 to lift. The lifting mechanism 110 can adopt a lifting drive structure such as a hydraulic lifting assembly, an electric lifting push rod, or a mechanical jacking assembly.

[0048] The number of lifting mechanisms 110 can be set to one or more. Multiple lifting mechanisms 110 can be distributed at intervals along the axial direction of the rotor 200 to form multiple support points for the rotor 200, so as to lift the rotor 200 more stably.

[0049] In some examples, there are two lifting mechanisms 110, which can be located at opposite ends of the rotor 200 to better lift the rotor 200.

[0050] The lifting mechanism 110 can be fixed to the ground, the foundation of the water pump or the surrounding frame, or placed directly on the ground by means of bolt fixing, bracket hoisting, base welding, etc. During the operation of the lifting mechanism 110, the lifting stroke can be precisely adjusted so that a stable separation gap is formed between the rotor 200 and the bearing 300.

[0051] The rotating mechanism 130 is a component used to drive the bearing shell 300 to rotate, thereby removing it from the bearing shell seat 400. The rotating mechanism 130 is connected to the fixed mechanism 120 and can employ a drive structure such as an electric rotary drive, a pneumatic rotary push rod, or a manually adjustable rotating assembly. The rotating mechanism 130 can be connected to the fixed mechanism 120 via frame support, side fixing, or end hinge. During operation, the rotating mechanism 130 outputs a rotary driving force that causes the fixed mechanism 120 to rotate around the axis of the rotor 200, synchronously causing the bearing shell 300 to rotate as well, gradually rotating the bearing shell 300 out of the internal space of the bearing shell seat 400.

[0052] By adopting the technical solution of this embodiment, when the bearing bush disassembly and maintenance device 100 is used, the rotor 200 and the bearing bush 300 are first connected by the fixing mechanism 120. Then, the lifting mechanism 110 is activated to drive the rotor 200 and the bearing bush 300 to be lifted upward, so that the bearing bush 300 and the bearing bush seat 400 are separated from each other, and a gap is formed between the insulating pad of the bearing bush 300 and the bearing bush seat 400. Subsequently, the rotating mechanism 130 is activated, and the fixing mechanism 120 is driven to rotate as a whole by the rotating mechanism 130, which drives the bearing bush 300 to rotate around the axis of the rotor 200, and gradually rotates the bearing bush 300 out of the bearing bush seat 400, thus completing the disassembly operation of the bearing bush 300. During this process, the bearing bush 300 and the rotor 200 are fixed by the fixing mechanism 120, so that before the rotating mechanism 130 drives the bearing bush 300 to rotate, the lifting mechanism 110 lifts the bearing bush, so that a gap is formed between the bearing bush 300 and the insulating pad, reducing the scraping friction between the bearing bush 300 and the insulating pad, reducing the occurrence of insulating pad damage, reducing the manpower and time investment for subsequent re-pasting of the insulating pad and equipment break-in, and also helping to maintain the original fitting accuracy and stress state of the bearing bush 300, and improving the stability of the water pump motor operation.

[0053] like Figures 2-5 As shown, in some embodiments, the fixing mechanism 120 includes a mating member 121 and a fixing member. The two ends of the mating member 121 mate with the two ends of the bearing bush 300 to form an annular structure for the rotor 200 to pass through. The fixing member connects the mating member 121 and the bearing bush 300.

[0054] The mating part 121 is a component adapted to the bearing shell 300 to be disassembled. The shape of the mating part 121 can be similar to another bearing shell 300 adapted to the bearing shell 300 to be disassembled. For example, it can be set as a semi-circular structure. The two ends of the mating part 121 are respectively spliced ​​with the two ends of the semi-circular bearing shell 300 to be disassembled, so as to form a complete circular structure. The annular structure formed by the mating part 121 and the bearing shell 300 is fitted on the outside of the rotor 200, thereby realizing the connection with the rotor 200. The inner wall of the annular structure can be spaced apart from the outer circumferential surface of the rotor 200. The specific gap can be set according to the needs. Of course, the inner wall of the annular structure can also fit against the outer circumferential surface of the rotor 200.

[0055] The fastener can be a component that connects the locking mating part 121 and the bearing bush 300. The fastener can fix the locking mating part 121 and the bearing bush 300 by means of bolt locking, snap fastening, or connecting part mating. After the fastener is assembled, the mating part 121 and the bearing bush 300 can be connected and fixed, so that the mating part 121 and the bearing bush 300 form a ring structure. The rotor 200 passes through the ring structure, so that a relatively stable connection structure is formed between the mating part 121, the bearing bush 300 and the rotor 200, so as to facilitate the subsequent lifting of the rotor 200 and the separation of the bearing bush 300 from the bearing bush seat 400.

[0056] By adopting the technical solution of this embodiment, when the lifting mechanism 110 drives the rotor 200 to lift, the mating part 121 and the bearing 300 can be lifted up synchronously with the rotor 200, so that a gap is formed between the bearing 300 and the insulating pad, thereby reducing the contact friction between the bearing 300 and the insulating pad during the subsequent pushing and rotating process, and reducing the possibility of the insulating pad being scratched and damaged.

[0057] In some embodiments, the fastener is a ring clamp, which is sleeved on the outside of the ring structure.

[0058] The ring clamp is a ring structure. The ring clamp is fitted on the outside of the ring structure formed by the splicing of the mating part 121 and the bearing bush 300, and is adapted to the overall shape of the ring structure.

[0059] By adopting the technical solution of this embodiment, the annular clamp has good connection reliability. After assembly, it can form a uniform tightening force on the annular structure, allowing the mating part 121 and the bearing 300 to maintain a stable connection state. This enables the bearing 300 to rise and fall stably with the rotor 200, which helps reduce the risk of damage to the insulating pad and bearing 300 during maintenance. In addition, the assembly method of the annular clamp is simple and convenient, and the overall fixing operation process is concise. There is no need for complicated alignment and locking steps, which can shorten the assembly time of the fixing mechanism 120 and improve the overall maintenance efficiency of the bearing 300 disassembly and assembly operation.

[0060] like Figure 5 As shown, in some embodiments, the outer peripheral surface of the mating member 121 is provided with a receiving groove 1211 for accommodating the annular clamp.

[0061] The receiving groove 1211 can refer to a groove structure for accommodating annular clamps. The receiving groove 1211 can be a semi-circular groove, and the outer circumferential surface of the mating part 121 is provided with the receiving groove 1211.

[0062] By adopting the technical solution of this embodiment, the receiving groove 1211 can limit and accommodate the annular clamp, so that the annular clamp can be fitted into the receiving groove 1211. The groove wall of the receiving groove 1211 restricts the positioning of the annular clamp in the axial direction of the rotor 200, thereby improving the connection stability between the mating part 121 and the bearing bush 300.

[0063] like Figure 6 As shown, in some embodiments, the lifting mechanism 110 includes a worm gear lifting mechanism 111 for lifting the rotor 200 of the drive motor.

[0064] The worm gear lifting mechanism 111 is a lifting drive structure using a worm gear and worm as transmission components. When the worm rotates, it drives the worm wheel to rotate synchronously. Combined with components such as the lead screw and bearing seat, the rotational motion is converted into linear lifting motion. This mechanism allows for precise adjustment of the lifting stroke, achieving vertical lifting drive based on the transmission characteristics of the worm gear, and can replace traditional jack lifting and overhead crane lifting methods. Traditional manual jacking operations rely on human experience and feel to control the lifting height, resulting in uncertainty in the lifting position of the rotor 200. It is difficult to accurately control the lifting distance of the rotor 200 and maintain its centered position within the air gap.

[0065] By adopting the technical solution of this embodiment, the worm gear lifting mechanism 111 has precise transmission control capability and self-locking capability, which can accurately control the lifting distance of the rotor 200, stably control the vertical displacement accuracy of the rotor 200, and make it easy to maintain the rotor 200 in a suitable position inside the air gap, thereby improving the standardization and controllability of the rotor 200 lifting operation.

[0066] like Figure 6 As shown, in some embodiments, the bearing assembly and maintenance device 100 further includes a lifting seat 140, the lifting end of the lifting mechanism 110 is connected to the lifting seat 140 to drive the lifting seat 140 to lift. The lifting seat 140 is provided with a V-groove 1401 for accommodating the rotor 200.

[0067] The lifting seat 140 is a component used to support the rotor 200; the lifting seat 140 is connected to the lifting end of the lifting mechanism 110, so that it can synchronously complete the vertical lifting action with the lifting mechanism 110. A V-shaped groove 1401 is formed on the surface of the lifting seat 140.

[0068] like Figure 6 As shown, in some embodiments, the lifting seat 140 includes a fixed base 141 and two stops 142. The bottom of the fixed base 141 is connected to the lifting end of the worm gear lifting mechanism 111. The two stops 142 are disposed on the upper side of the fixed base 141. The surfaces of the two stops 142 facing away from the fixed base 141 are inclined surfaces, and the two inclined surfaces are set at an angle to form a V-shaped groove 1401. The lifting seat 140 adopts the structure of a fixed base 141 and two stops 142, which is simple in structure and easy to manufacture.

[0069] By adopting the technical solution of this embodiment, the V-shaped groove 1401 is inclined relative to the two side walls to form a limiting structure. After the rotor 200 is placed in the V-shaped groove 1401, the rotor 200 can achieve automatic centering and positioning, and the placement position of the rotor 200 can be adjusted. Furthermore, the enclosing limiting structure of the V-shaped groove 1401 can constrain the lateral displacement of the rotor 200, reduce the possibility of the rotor 200 shifting or tipping during the lifting operation, and improve the stability of the rotor 200 lifting and supporting process.

[0070] like Figure 6 As shown, in some embodiments, the bearing assembly and maintenance device 100 further includes a moving mechanism 150, the moving end of which is connected to the lifting mechanism 110 to drive the lifting mechanism 110 to move along a first direction, the first direction being perpendicular to the axial direction of the rotor 200 and the lifting direction of the lifting mechanism 110.

[0071] The moving mechanism 150 is a component used to adjust the position of the lifting mechanism 110 in the first direction. The lifting end of the moving mechanism 150 is connected to the lifting mechanism 110 and can drive the lifting mechanism 110 to generate displacement movement in the first direction. The moving direction of the moving mechanism 150 is defined as the first direction, which is perpendicular to both the axial direction of the rotor 200 and the vertical lifting direction of the lifting mechanism 110. It can be considered as a horizontal adjustment dimension of the bearing assembly and maintenance device 100.

[0072] After the rotor 200 and the lifting mechanism 110 complete the support engagement, the rotor 200 may have a positional deviation in the first direction. At this time, the lifting mechanism 110 can be driven to move along the first direction by the moving mechanism 150, and at the same time, the rotor 200 carrying the load can be finely adjusted in the first direction to correct and compensate for the position of the rotor 200 in the first direction.

[0073] By adopting the technical solution of this embodiment, the lifting mechanism 110 can adjust the position of the rotor 200 along the lifting direction, and the moving mechanism 150 can adjust the position of the rotor 200 along the first direction, so that the rotor 200 can be in the center position inside the air gap, and the bearing 300 can be lifted smoothly with the rotor 200. This is conducive to the formation of a uniform gap between the insulating pad and the bearing 300, reducing the risk of contact and scratching of the insulating pad during the rotation and removal of the bearing 300, and improving the situation of insulation pad damage.

[0074] like Figure 6 As shown, in some embodiments, the moving mechanism 150 includes a mounting base 151, a guide rail 152, a slider 153, and a telescopic component 154. The guide rail 152 is mounted on the mounting base 151, the slider 153 is slidably connected to the guide rail 152 and connected to the lifting mechanism 110, and the telescopic end of the telescopic component 154 is connected to the slider 153 to drive the slider 153 to slide along a first direction.

[0075] Mounting base 151 can be the mounting base for guide rail 152 and telescopic component 154, and is used to support guide rail 152 and telescopic component 154. Slider 153 forms a sliding fit structure with guide rail 152, and slider 153 is also connected to lifting mechanism 110, and can drive lifting mechanism 110 to move synchronously as it slides.

[0076] The telescopic component 154 provides power for the movement of the slider 153. The guide rail 152 extends along the first direction. The telescopic end of the telescopic component 154 drives the slider 153 to slide relative to the guide rail 152 along the first direction.

[0077] The telescopic component 154 can be selected from various structural forms such as electric push rod, hydraulic telescopic rod, pneumatic telescopic cylinder, and screw drive assembly.

[0078] By adopting the technical solution of this embodiment, the guide rail 152 and the slider 153 cooperate with each other to constrain the movement trajectory of the slider 153, so that the lifting mechanism 110 and the rotor 200 it carries can operate more smoothly during the movement along the first direction, and it is also conducive to accurately controlling the position of the rotor 200 in the first direction, so that the rotor 200 can be stably located in the air gap.

[0079] like Figure 6 As shown, in some embodiments, the telescopic component 154 includes a screw 1541, a nut 1542, and a fixed base 1543. The screw 1541 is rotatably mounted on the mounting base 151, and the nut 1542 is threadedly connected to the screw 1541. The lifting mechanism 110, the nut 1542, and the slider 153 are all connected to the fixed base 1543.

[0080] The screw 1541 is rotatably mounted on the mounting base 151. The screw 1541 passes through the nut 1542 and is engaged by threads. The nut 1542 forms a transmission connection with the screw 1541 through a threaded structure. The fixed base 1543 connects the nut 1542, the slider 153, and the lifting mechanism 110 into a whole. When the screw 1541 rotates, it can drive the nut 1542 and the fixed base 1543 to move together in the first direction.

[0081] By adopting the technical solution of this embodiment, the screw 1541 and the nut 1542 form a threaded transmission structure, which enables the moving mechanism 150 to have high adjustment accuracy and accurately control the moving stroke, thereby adjusting the position of the rotor 200 in the first direction and keeping the rotor 200 inside the air gap.

[0082] like Figure 6 As shown, in some embodiments, the lifting mechanism 110 further includes a guide rod 112 and a guide sleeve 113. The guide rod 112 is disposed on the fixed base 141, and the guide sleeve 113 is disposed on the fixed seat 1543. The guide sleeve 113 is sleeved outside the guide rod 112. The guide rod is arranged parallel to the lifting direction of the lifting mechanism 110. The lifting mechanism 110 drives the fixed base 141 to lift and lower, thereby driving the rotor 200 to lift and lower. During this process, the guide rod 112 moves up and down inside the guide sleeve 113, thereby providing guidance for the lifting and lowering of the fixed base 141, making the lifting seat 140 more stable and reliable.

[0083] like Figures 2-4 As shown, in some embodiments, the rotating mechanism 130 includes a winch 131 and a connecting rope connected to the fixing mechanism 120. The connecting rope is wound around the winch 131 to drive the fixing mechanism 120 to rotate about the axis of the rotor 200.

[0084] The winch 131 refers to the rotating component that winds up and unwinds the connecting rope. The connecting rope transmits traction force through the winch 131, causing the traction fixing mechanism 120 to move accordingly. When the winch 131 is running, it winds up the connecting rope, which can drive the fixing mechanism 120 and the bearing 300 to rotate together around the axis of the rotor 200. The winch 131 can be a manual winch, an electric winch, a worm gear winch, etc.; the connecting rope can be made of materials such as steel wire rope, high-strength nylon rope, or composite fiber rope.

[0085] By adopting the technical solution of this embodiment, the operation of the winch 131 and the connecting rope is simple. The winch 131 can achieve low-speed and stable traction action, which can replace the manual pushing and turning operation and reduce the occurrence of limbs being pinched or bumped during the operation.

[0086] like Figures 2-4 As shown, in some embodiments, the rotating mechanism 130 further includes a pulley 133 and a first mounting bracket 132 for mounting on the rotor 200. The pulley 133 and the winch 131 are connected to the first mounting bracket 132, and the connecting rope is wound around the pulley 133.

[0087] The first mounting bracket 132 can refer to a component used for mounting the pulley 133 and the winch 131. The first mounting bracket 132 can be roughly U-shaped. The first mounting bracket 132 is mounted on the rotor 200, spanning across the rotor 200, and also facilitates the mounting of the pulley 133 on the upper side of the rotor 200. Both the pulley 133 and the winch 131 are mounted on the first mounting bracket 132. The connecting rope passes around the pulley 133 to form a guide structure, which can change the traction direction of the connecting rope.

[0088] By adopting the technical solution of this embodiment, the pulley 133 guides the connecting rope, making the transmission of traction force smoother and facilitating the traction fixing mechanism 120 to complete the rotation action.

[0089] like Figures 2-4 As shown, in some embodiments, the two ends of the mating part 121 may be provided with connecting shafts 122. One end of the connecting rope is fixed on the connecting shaft 122 located at one end, and the other end of the connecting rope passes around the pulley 133 and is connected to the winch 131. In this way, rotating the winch 131 can drive the mating part 121 and the bearing 300 to rotate, thereby rotating the bearing 300 out of the bearing seat 400.

[0090] In some embodiments, the first mounting bracket 132 may be disposed on the ground or on the bearing seat 400. Where the first mounting bracket 132 is disposed on the bearing seat 400, it facilitates the accurate installation of the rotating mechanism 130.

[0091] like Figures 2-4 As shown, in some embodiments, the bearing assembly and maintenance device 100 includes a detection mechanism 160 for detecting the position of the rotor 200. The detection mechanism 160 includes a first detection element 161, a second detection element 162, and a second mounting bracket 163 mounted on the rotor 200. The first detection element 161 is mounted on the second mounting bracket 163 to measure the position of the rotor 200 in a first direction. The second detection element 162 is mounted on the second mounting bracket 163 to measure the position of the rotor 200 in the rotor 200 lifting direction. The first direction is perpendicular to the axial direction of the rotor 200 and the rotor 200 lifting direction.

[0092] The second mounting bracket 163 can refer to a component used for mounting the first detection element 161 and the second detection element 162. The second mounting bracket 163 can be roughly inverted U-shaped. The second mounting bracket 163 is mounted on the rotor 200. The first detection element 161 and the second detection element 162 are respectively arranged on the second mounting bracket 163. The first detection element 161 collects the position information of the rotor 200 in the first direction, and the second detection element 162 collects the position information of the rotor 200 in the lifting direction.

[0093] The first detection element 161 and the second detection element 162 can be components such as a laser rangefinder, dial indicator, displacement sensor, and grating ruler. The number of the first detection element 161 and the second detection element 162 can be one or more.

[0094] In some examples, there may be two first detection elements 161 and one second detection element 162. The second detection element 162 is located on the upper side of the rotor 200, and the two first detection elements 161 are located on the front and rear sides of the rotor 200 to more accurately detect the position of the rotor 200.

[0095] By adopting the technical solution of this embodiment, the first detection element 161 and the second detection element 162 can obtain the precise position data of the rotor 200 in the lifting direction and the first direction. The staff can grasp the posture of the rotor 200 based on the data, adjust the position of the rotor 200 in the air gap, reduce the probability of collision between the stator and the rotor 200, and improve the quality and accuracy of the overall maintenance operation.

[0096] In some embodiments, the second mounting bracket 163 may be disposed on the ground or on the bearing seat 400. Where the second mounting bracket 163 is disposed on the bearing seat 400, it facilitates the accurate installation of the detection mechanism 160.

[0097] In some embodiments, the first mounting bracket 132 and the second mounting bracket 163 may be distributed axially at intervals along the rotor 200, which can reduce interference and facilitate the maintenance of the bearing 300.

[0098] In some embodiments, the bearing assembly and maintenance device 100 includes an electrical control box 170 and a control terminal. The detection mechanism 160 is electrically connected to the electrical control box 170, and the electrical control box 170 is transmitted to the control terminal. During the lifting process of the lifting mechanism 110, the first detection element 161 and the second detection element 162 can detect the position information of the rotor 200 in real time and transmit the position display to the control terminal through the electrical control box 170. Personnel can accurately control the lifting process of the rotor 200 through the position information displayed by the control device. If the rotor 200 deviates beyond the tolerance, the system will immediately alarm. The control terminal can be a display screen, tablet, computer, or other components.

[0099] The bearing assembly and maintenance device 100 breaks through the limitations of traditional single tools. Through the precise lifting of the lifting mechanism 110, the accurate monitoring of the detection mechanism 160, and the flexible mechanical traction of the connecting rope, the rotor 200 lifting, centering and alignment, and bearing 300 traction are seamlessly connected, forming a complete closed loop of operation.

[0100] The precision mechanical transmission of the worm gear lifting mechanism 111 is introduced into the lifting operation. The first detection component 161 and the second detection component 162 adopt 0.01mm-level laser rangefinders; the lifting accuracy can be controlled within 0.01mm. At the same time, the 0.01mm-level laser rangefinder and wireless transmission technology between the electrical control box 170 and the control terminal are introduced. The process, which relied on the "feel" and "visual inspection" of experienced workers, is transformed into a digital process with real-time data visualization and automatic alarm for out-of-tolerance conditions, thus achieving inherent safety.

[0101] To address the risks of damage to the insulating pad and hand pinching, a lightweight mating component 121 is designed as a dedicated gripper to vertically separate the bearing bush 300 from the insulating pad, eliminating the risk of the circumferential edge of the bearing bush 300 rubbing against the insulating pad. Furthermore, by utilizing the principle of oil film lubrication, a winch 131 provides low-speed and stable traction, completely replacing the manual pushing and turning that could potentially pinch hands.

[0102] The bearing removal and maintenance device 100 of this application embodiment achieves 100% non-destructive protection of the insulating gasket during the bearing replacement work of the large motor rotor 200 through the close cooperation of four major units: precise lifting, intelligent monitoring, mating parts 121 and winch 131 traction, as well as digital and intelligent control of the bearing replacement process.

[0103] The following describes the operation procedure of the bearing disassembly and repair device 100 described in this application during the bearing flipping process.

[0104] At the start of the operation, the mating part 121 is placed on the upper side of the bearing shell 300, and then the mating part 121 is connected to the bearing shell 300 to form a ring structure. The rotor 200 passes through the ring structure with a clearance fit. Then, the lifting mechanism 110, through the combination of the worm gear lifting mechanism 111, guide rail 152, and slider 153, and with the automatic centering assistance of the V-groove 1401, smoothly lifts the rotor 200 with an accuracy of 0.01mm. At the same time, the first detection element 161 and the second detection element 162 are immediately activated to monitor the displacement data of the rotor 200 in real time and display it on the control terminal via wireless transmission. Once the lifting posture of the rotor 200 deviates, the system will immediately alarm. Personnel will immediately fine-tune the rotor 200 through the lifting mechanism 110 and the telescopic component 154 to ensure that the center line of the rotor 200 is always aligned and parallel to the center line of the bearing shell 400 in the first direction. In addition, it is also necessary to ensure that there is a gap between the rotor 200 and the top of the motor winding.

[0105] When the rotor 200 is precisely lifted until the mating part 121 contacts the inner wall of the rotor 200, the mating part 121 adheres to the rotor 200. Then, the lifting mechanism 110 continues to lift the rotor 200, and the mating part 121 vertically lifts the bearing 300 using a ring clamp, causing the insulating pad beneath the bearing 300 to slowly separate from it. This "vertical lifting" action eliminates the risk of scraping that may occur with the traditional method of pushing and turning the bearing along the insulating pad, achieving a non-destructive separation of the insulating pad.

[0106] After the bearing shell 300 separates from the insulating pad, the winch 131 begins operation. Personnel connect the connecting rope wound around the winch 131 to the connecting shaft 122 of the mating component 121 via pulley 133, and then crank the winch 131. Under mechanical traction, the bearing shell 300 rotates slowly and smoothly around the axis of the rotor 200. Throughout the rotation, the lifting mechanism 110 and the detection mechanism 160 remain on standby, continuously monitoring the position of the rotor 200 to ensure absolute safety during rotation. Under the continuous traction of the winch 131, the bearing shell 300 is safely flipped from the bottom to the top of the bearing shell seat 400 and smoothly removed for maintenance. Because the insulating pad remains separate from the bearing shell 300 throughout the process without any abrasion, the integrity and performance of the insulating pad are protected to the greatest extent. After maintenance, the operation can be reversed, and the bearing shell 300 can be flipped back without damage under the monitoring of the detection mechanism 160.

[0107] The bearing assembly and maintenance device 100 of this application embodiment can address the pain points of traditional bearing replacement processes for nuclear power plant feedwater pump motors, such as easily damaged insulation pads, low operational accuracy, and high safety risks. It proposes a non-destructive bearing replacement solution that integrates precise lifting, intelligent monitoring, and traction by the mating parts 121 and the winch 131.

[0108] In the above steps, lubricating oil can be injected into the inner wall of the bearing 300 when connecting the mating part 121 and the bearing 300. This forms a protective oil film between the bearing 300 and the rotor 200, which provides lubrication and improves the smoothness of the bearing 300's rotation on the rotor 200. This also makes it easier to inject lubricating oil at this time, resulting in better lubrication. Alternatively, in other embodiments, lubricating oil can be injected in other steps before rotating the bearing 300, for example, after the bearing 300 is separated from the insulating pad.

[0109] Traditional methods use jacks or cranes to lift the rotor 200. The lifting height and centering adjustment rely entirely on manual experience, which is like a "blind box" operation. It cannot guarantee that the rotor 200 is in the correct position in the stator. Improper operation may result in a collision between the stator and the rotor 200.

[0110] The combination of the worm gear lifting mechanism 111 and the moving mechanism 150 enables smooth lifting at the 0.01mm level and precise horizontal fine-tuning. The V-groove 1401 automatically aligns the lifting mechanism 110 and the rotor 200. The intelligent monitoring of the detection mechanism 160 incorporates a high-precision (0.01mm) laser rangefinder and wireless data transmission, displaying the rotor 200 displacement data in real-time on the control terminal, and providing an out-of-tolerance alarm function. This transforms traditional vague operations relying on "feel" and "visual inspection" into data-driven, real-time, and visually-based digital precision operations. Operators can precisely control the rotor 200's attitude, ensuring it remains centered in the stator's air gap, effectively preventing the risk of collision between the stator and rotor 200, and significantly improving maintenance quality and accuracy.

[0111] Traditional processes rely on manual pushing and pulling to flip the bearing shells. Due to the limited operating space and uneven force, the PTFE insulating pads, which are only 0.5mm thick, are easily scratched or torn by the edges of the bearing shell 300. This damage is not only time-consuming to repair (requiring re-pasting and grinding), but may also cause excessive motor vibration due to the incompatibility of the new insulating pads with the bearing shell 300.

[0112] The bearing 300 is vertically lifted by the high-strength aluminum alloy fitting 121 and the ring clamp, so that the bearing 300 and the insulating pad can be separated without contact. The bearing 300 is pulled by the winch 131, and the low-speed and stable mechanical traction replaces the manual and rough pushing and turning of the bearing, avoiding shaking and scratching. This eliminates mechanical damage to the insulating pad from the root, ensures the integrity and performance of the insulating pad, and avoids secondary equipment failure caused by maintenance.

[0113] When manually rotating the bearing bush at 300°, the hands need to directly participate in the movement and rotation of the heavy object, which can easily lead to mechanical injuries such as finger pinching and squeezing in a confined space.

[0114] The winch 131 is used for traction. The first mounting bracket 132 and the winch 131, which are fixed on the bearing seat 400, are connected to the remote traction component 121 via a connecting rope, thereby driving the bearing 300 to rotate. This achieves physical isolation of the operator's hands, eliminating the need for the operator to put their hands into the danger zone for pushing and pulling operations. This fundamentally prevents personal safety accidents such as finger pinching and achieves inherent safety.

[0115] If the insulation pad is damaged, it needs to be reworked, which not only prolongs the overhaul period, but also increases the uncertainty and workload caused by repeated disassembly and assembly.

[0116] Through integrated electromechanical and instrumentation design, precise lifting, intelligent monitoring, and the seamless connection between component 121 and winch 131 are integrated, forming a standardized operating procedure. Lifting, monitoring, traction, and alarm processes work in close coordination, avoiding trial and error and rework. The new process prevents rework and reduced equipment reliability due to damaged insulation pads, improving overall operational efficiency. The standardized operating procedure reduces the impact of human factors on process reliability.

[0117] The bearing assembly and maintenance device 100 is not just a set of tools and methods, but a system-level solution integrating precision mechanics (worm gears, guide rails 152), sensor technology (laser ranging), wireless communication, and digital display. It successfully transforms the implicit experience of veteran operators (tactile feel, visual inspection) into explicit data parameters (displacement, attitude, alarm thresholds), providing traceable, quantifiable, and replicable technical means for the maintenance of critical equipment in nuclear power plants. This marks a leap from traditional "manual operation" to "precision collaboration" and "digital intelligent management" in bearing replacement work.

[0118] The application of the precision lifting mechanism 110 directly eliminates the high-risk (level 3 risk) problem of lifting the rotor 200. Mechanical traction is achieved through the winch 131, physically isolating personnel's hands from the heavy object area, fundamentally eliminating the risk of finger injuries from traditional processes and significantly improving the safety of tile-turning operations. The standardized operation integrating electromechanical systems avoids rework due to damaged insulation pads. Damaged insulation pads require disassembly, pasting, curing, and grinding, which is expected to increase working hours. Furthermore, vibration issues that may arise after replacing insulation pads also require additional time. The new device and process are expected to save time and avoid the cost of spare parts for replacing insulation pads, as well as the labor costs associated with replacing insulation pads and vibration optimization. The introduction of digital real-time monitoring and a precision lifting and translation device solves the problems of unquantifiable control and insulation pad contact in traditional tile-turning processes. Simultaneously, the use of a process-based tile-turning method in conjunction with the winch 131 eliminates the risk of scratching the insulation pad during manual tile turning, achieving precise and controllable tile-turning and fundamentally ensuring the stability of tile-turning quality.

[0119] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A bearing assembly and repair device, characterized in that, include: A fixing mechanism used to connect the rotor and bearing of the motor; A lifting mechanism is used to drive the bearing and the rotor to lift and lower, so that the bearing is separated from the insulating pad in the bearing seat; A rotating mechanism is connected to the fixed mechanism to drive the fixed mechanism to rotate, thereby driving the bearing to rotate about the axis of the rotor.

2. The bearing assembly and repair device according to claim 1, characterized in that: The fixing mechanism includes a mating component and a fixing component. The two ends of the mating component mate with the two ends of the bearing bush to form an annular structure for the rotor to pass through. The fixing component connects the mating component and the bearing bush.

3. The bearing assembly and repair device according to claim 2, characterized in that: The fastener is a ring clamp, which is fitted over the ring structure.

4. The bearing assembly and repair device according to claim 3, characterized in that: The outer circumferential surface of the mating component is provided with a receiving groove for accommodating the annular clamp.

5. The bearing assembly and repair device according to any one of claims 1 to 4, characterized in that: The lifting mechanism includes a worm gear lifting mechanism for lifting the rotor of the drive motor.

6. The bearing assembly and repair device according to any one of claims 1 to 4, characterized in that: The bearing assembly and maintenance device also includes a lifting seat. The lifting end of the lifting mechanism is connected to the lifting seat to drive the lifting seat to move up and down. The lifting seat is provided with a V-shaped groove for accommodating the rotor.

7. The bearing assembly and repair device according to any one of claims 1 to 4, characterized in that: The bearing assembly and repair device further includes a moving mechanism, the moving end of which is connected to the lifting mechanism to drive the lifting mechanism to move along a first direction, which is perpendicular to the axial direction of the rotor and the lifting direction of the lifting mechanism.

8. The bearing assembly and repair device according to claim 7, characterized in that: The moving mechanism includes a mounting base, a guide rail, a slider, and a telescopic component. The guide rail is mounted on the mounting base, the slider is slidably connected to the guide rail and connected to the lifting mechanism, and the telescopic end of the telescopic component is connected to the slider to drive the slider to slide along the first direction.

9. The bearing assembly and repair device according to claim 8, characterized in that: The telescopic component includes a screw, a nut, and a fixed base. The screw is rotatably mounted on the mounting base, and the nut is threadedly connected to the screw. The lifting mechanism, the nut, and the slider are all connected to the fixed base.

10. The bearing assembly and repair device according to any one of claims 1 to 4, characterized in that: The rotating mechanism includes a winch and a connecting rope. The connecting rope is connected to the fixing mechanism and is wound around the winch to drive the fixing mechanism to rotate about the axis of the rotor.

11. The bearing assembly and repair device according to claim 10, characterized in that: The rotating mechanism further includes a pulley and a first mounting bracket for mounting on the rotor, the pulley being connected to the first mounting bracket, and the connecting rope being wound around the pulley.

12. The bearing assembly and repair device according to any one of claims 1 to 4, characterized in that: The bearing assembly and repair device includes a detection mechanism for detecting the rotor position. The detection mechanism includes a first detection element, a second detection element, and a second mounting bracket mounted on the rotor. The first detection element is mounted on the second mounting bracket to measure the position of the rotor in a first direction. The second detection element is mounted on the second mounting bracket to measure the position of the rotor in the rotor lifting direction. The first direction is perpendicular to the rotor's axial direction and the rotor's lifting direction.

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