A device for adjusting the center of coupling of a horizontal water pump in a power plant.

Abstract

This invention discloses a device for adjusting the center of a coupling in a horizontal water pump maintenance system for power plants, comprising a water pump shaft end and a motor shaft end; a coupling is provided between the water pump shaft end and the motor shaft end; a crescent-shaped frame is provided on the water pump shaft end, the motor shaft end, or the coupling; three rectangular telescopic centering rods are slidably arranged radially on the crescent-shaped frame; a deep groove is opened on the inner end face of each telescopic centering rod; thereby achieving relative fixation between the crescent-shaped frame and the shaft system, the fixing method is simple and convenient, and since the three telescopic centering rods move towards the shaft system simultaneously, when the three telescopic centering rods contact the shaft system at the same time, it can be considered that the crescent-shaped frame and the shaft system are coaxial, and the coaxial state can be maintained during secondary or even tertiary fixing without the need for readjustment, making secondary centering convenient, enhancing the willingness of maintenance personnel to perform secondary alignment, and shortening the time for adjusting the center of the coupling during maintenance.

Description

Technical Field

[0001] This invention relates to the field of coupling installation technology, specifically to a device for adjusting the center of the coupling of a horizontal water pump in a power plant during maintenance. Background Technology

[0002] Although water pumps do not directly generate electricity, they serve as the driving force for the flow of working fluids, permeating every stage of thermal power generation and acting as the "circulatory system" of the power plant. From boiler water supply to waste heat discharge and water resource recovery, the reliability and efficiency of water pumps directly determine the safety and economy of a thermal power plant. During water pump installation, couplings are used to connect the pump shaft and motor shaft for easier maintenance. Since the coaxiality of the pump shaft, motor shaft, and coupling affects the stability, service life, and operating efficiency of both the pump and motor, it is necessary to eliminate not only radial misalignment but also axial misalignment between the two couplings to achieve optimal operating results.

[0003] Currently, when adjusting the center of the coupling between the pump, motor, and coupling, a dial indicator is needed to adjust the radial and axial deviations between the couplings. The adjustment methods can be divided into single-sided rotation method (rotating only one side of the shaft after fixing the dial indicator) and synchronous rotation method (two shafts are rigidly connected and rotate synchronously) according to the rotation method. According to the detection method, they can be divided into single-indicator method, double-indicator method, and triple-indicator method.

[0004] In practice, when reinstalling couplings, maintenance personnel typically fix the bracket at a point on shaft A, measure the outer diameter of coupling B, then fix the bracket at another point on shaft B, and measure the outer diameter of coupling A again. Based on these readings, they adjust the coupling's center of gravity. However, manufacturing defects in the shaft system itself (such as uneven outer surfaces), human error, and improper bracket installation leading to instability can easily cause significant errors in the center of gravity adjustment. Therefore, to be on the safe side, a secondary centering measurement is used, which can mitigate the risk of errors to some extent.

[0005] In the current operating procedure, the dial indicator along with its bracket needs to be removed from the shaft system and then repositioned and re-fixed. This method of fixing is cumbersome, which not only affects the maintenance personnel's willingness to perform secondary centering measurements, but also prolongs the time for adjusting the center of the coupling when repairing it, thus affecting work efficiency. Summary of the Invention

[0006] The purpose of this invention is to provide a device for adjusting the center of the coupling of a horizontal water pump in a power plant, which solves the technical problem in the prior art where the dial indicator fixing method is cumbersome, which not only affects the maintenance personnel's willingness to perform secondary centering measurements, but also prolongs the time for adjusting the center of the coupling during maintenance, thus affecting work efficiency.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] A coupling center adjustment device for a horizontal water pump in a power plant includes a water pump shaft end and a motor shaft end; a coupling is provided between the water pump shaft end and the motor shaft end; a crescent-shaped frame is provided on the water pump shaft end, the motor shaft end, or the coupling; three rectangular telescopic centering rods are slidably arranged radially on the crescent-shaped frame; a deep groove is opened on the inner end face of the telescopic centering rod; a guide rod is slidably connected in the deep groove; a contact block is fixedly connected to the lower end of the guide rod, and the contact block can retract into the deep groove; a spring is sleeved on the guide rod; a rotatable ball is embedded in the center of the lower surface of the contact block; the inner end face of the telescopic centering rod is also provided with raised grooves; a fixing block is fixedly connected to the outer surface of the crescent-shaped frame; a dial indicator body is connected to the fixing block via a bracket.

[0009] Preferably, the crescent-shaped frame has a cavity inside; multiple rotatably connected limiting shafts are arranged in an arc-shaped array inside the cavity; a transmission belt is rotatably connected to the limiting shafts; and shafts are rotatably connected to the cavity at positions corresponding to the sides of the telescopic centering rod.

[0010] Preferably, the transmission belt has a first concave tooth; the telescopic centering rod has a second concave tooth; a first gear is fixedly connected to the shaft at the position corresponding to the first concave tooth, and a second gear is fixedly connected at the position corresponding to the second concave tooth.

[0011] Preferably, the crescent-shaped frame is further fixed with an arc-shaped limiting block at a position corresponding to the inner side of the limiting pivot.

[0012] Preferably, the crescent-shaped frame is further slidably connected with symmetrically arranged auxiliary support rods; the inner ends of the auxiliary support rods are rotatably connected with rollers.

[0013] Preferably, the shaft is fixedly connected to a knob on the outer side of the crescent-shaped frame; the knob is fixedly connected to a first protrusion in a circumferential array on the side near the crescent-shaped frame; the auxiliary support rod is fixedly connected to a second protrusion in a linear array on the side; and the crescent-shaped frame has matching recesses at the positions corresponding to the first and second protrusions.

[0014] Preferably, rotating the knob clockwise causes one of the shafts to rotate. When the shaft rotates, the engagement of the first gear and the first concave tooth drives the transmission belt to rotate. The transmission belt then drives all other shafts to rotate through the engagement of other sets of first gears and the first concave teeth. Finally, the shafts, in conjunction with the second gear and the second concave tooth, drive all the telescopic centering rods to slide on the crescent-shaped frame, so that the inner ends of all the telescopic centering rods abut against the outer surface of the shaft system.

[0015] Preferably, when the inner end of the telescopic centering rod moves outward, the ball bearing protrudes outward from the outside of the convex groove under the action of the spring, replacing the convex groove and abutting against the shaft system, thereby maintaining the coaxial state between the crescent-shaped frame and the shaft system.

[0016] Preferably, when the inner end of the telescopic centering rod approaches the shaft system, the ball bearings are forced to retract into the deep groove, causing the ridges to abut against the surface of the shaft system, thereby achieving relative fixation of the position between the crescent-shaped fixing bracket and the shaft system.

[0017] Preferably, the knob is turned counterclockwise to move the telescopic centering rod outwards synchronously. After changing the position of the crescent-shaped frame, the knob is turned clockwise again to move the telescopic centering rod inwards synchronously, thus completing the fixation again. The two dial indicator bodies are once again symmetrically arranged along the axis of symmetry at their different positions on the coupling.

[0018] The beneficial effects of this invention are:

[0019] 1. In this invention, the ball bearings are controlled to extend and retract by a spring. Therefore, when the inner end of the telescopic centering rod approaches the shaft system, the ball bearings are forced to retract into the deep groove, causing the convex groove to abut against the surface of the shaft system. This achieves relative fixation between the crescent-shaped fixing bracket and the shaft system, making the fixing method simple and convenient. Furthermore, since all three telescopic centering rods approach the shaft system simultaneously, when all three telescopic centering rods are in contact with the shaft system at the same time, it can be considered that the crescent-shaped bracket and the shaft system are coaxial. The coaxial state can be maintained during secondary or even tertiary fixing without the need for readjustment. Secondary centering is convenient, enhancing the willingness of maintenance personnel to perform secondary alignment and shortening the time for adjusting the center of the coupling when repairing the coupling.

[0020] 2. When the shaft system needs to be recalibrated, the inner end of the telescopic centering rod is slidably connected to a guide rod, and the lower end of the guide rod is connected to a ball bearing via a contact block. Therefore, when the inner end of the telescopic centering rod moves outward, the ball bearing protrudes outward from the convex groove under the action of the spring, replacing the convex groove and abutting against the shaft system. This keeps the crescent-shaped frame and the shaft system coaxial, facilitating the maintenance personnel to make secondary adjustments to the position of the dial indicator without changing the fixed angle of the dial indicator body support. This makes the secondary calibration result more reasonable and convenient for comparison with the primary calibration result, avoiding errors in the comparison result.

[0021] 3. This invention, through the cooperation of three sets of telescopic centering rods that can slide on the crescent-shaped frame, can quickly adjust the position of the dial indicator body. Even when using the three-indicator method to adjust the center of the shaft system, it can adapt to this more complex bracket installation method. Because it is convenient and simple, it not only greatly enhances the willingness of maintenance personnel to perform secondary alignment, but also shortens the time for adjusting the center of the coupling when maintaining the coupling, making it suitable for widespread application. Attached Figure Description

[0022] The invention will now be further described with reference to the accompanying drawings.

[0023] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0024] Figure 2 This is a front view of Embodiment 1 of the present invention;

[0025] Figure 3 This is a schematic diagram of the crescent-shaped frame structure in Embodiment 1 of the present invention;

[0026] Figure 4 This is a front cross-sectional view of the crescent-shaped frame in Embodiment 1 of the present invention;

[0027] Figure 5 yes Figure 4 A magnified view of a section at point A in the middle;

[0028] Figure 6 This is a reverse cross-sectional view of the crescent-shaped frame in Embodiment 1 of the present invention;

[0029] Figure 7 yes Figure 6 A magnified view of a section at point B in the middle;

[0030] Figure 8 This is a schematic diagram of the transmission belt structure in Embodiment 1 of the present invention;

[0031] Figure 9 yes Figure 8 A magnified view of a section at point C;

[0032] Figure 10 This is a schematic diagram of the telescopic centering rod structure in Embodiment 1 of the present invention;

[0033] Figure 11 This is a cross-sectional view of the overall structure of Embodiment 1 of the present invention;

[0034] Figure 12 yes Figure 11 A magnified view of a section at point D;

[0035] Figure 13 This is a schematic diagram of the overall structure of Embodiment 2 of the present invention;

[0036] Figure 14 This is a schematic diagram of the dial gauge body arrangement in Embodiment 2 of the present invention.

[0037] In the diagram: 1. Pump shaft end; 2. Motor shaft end; 3. Coupling; 4. Crescent-shaped frame; 5. Telescopic centering rod; 6. Cavity; 7. Limiting shaft; 8. Transmission belt; 9. Limiting block; 10. Shaft; 11. First gear; 12. First concave tooth; 13. Second concave tooth; 14. Second gear; 15. Deep groove; 16. Guide rod; 17. Contact block; 18. Spring; 19. Ball bearing; 20. Raised pattern; 21. First raised point; 22. Auxiliary support rod; 23. Roller; 24. Concave point; 25. Axis of symmetry; 26. Fixing block; 27. Dial indicator body; 28. Knob. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1:

[0039] Please see Figures 1-3 As shown, a horizontal water pump maintenance coupling wheel center adjustment device for a power plant includes a water pump shaft end 1 and a motor shaft end 2; a flange coupling 3 is provided between the water pump shaft end 1 and the motor shaft end 2; a crescent-shaped frame 4 is provided on the water pump shaft end 1, the motor shaft end 2, or the coupling 3 (in this embodiment, it is provided on the coupling 3); three rectangular telescopic centering rods 5 are radially slidably provided on the crescent-shaped frame 4, and the inner ends of the telescopic centering rods 5 form the three vertices of an equilateral triangle.

[0040] Please refer to it again. Figures 8-10 As shown, a deep groove 15 is formed on the inner end face of the telescopic centering rod 5; a guide rod 16 is slidably connected within the deep groove 15; a contact block 17 is fixedly connected to the lower end of the guide rod 16, and the contact block 17 can retract into the deep groove 15; a spring 18 is sleeved on the guide rod 16, and the upper and lower ends of the spring 18 are respectively connected to the upper end of the deep groove 15 and the contact block 17; a rotatable ball 19 is embedded in the center of the lower surface of the contact block 17, and a small part of the ball 19 protrudes from the lower surface of the contact block 17 for contacting the shaft system; a fixing block 26 is fixedly connected to the outer surface of the crescent-shaped frame 4; a dial indicator body 27 is connected to the fixing block 26 via a bracket. Furthermore, the inner end face of the telescopic centering rod 5 is also provided with raised textures 20 to increase the friction between the telescopic centering rod 5 and the shaft system.

[0041] Please refer to it again. Figures 4-9As shown, the crescent-shaped frame 4 has a cavity 6 inside, and the telescopic centering rod 5 passes through the cavity 6; the crescent-shaped frame 4 has multiple rotatably connected limiting shafts 7 arranged in an arc shape inside the cavity 6, and an arc-shaped limiting block 9 is fixed to the inner side of the limiting shaft 7; a transmission belt 8 is rotatably connected to the limiting shaft 7, and the bending shape of the transmission belt 8 is limited by the limiting shaft 7 and the limiting block 9; the transmission belt 8 has a first concave tooth 12; the cavity 6 has a telescopic centering rod 5 inside the cavity 6. A shaft 10 is rotatably connected to each side of the central rod 5; a second concave tooth 13 is provided on the telescopic central rod 5; a first gear 11 is fixed to the shaft 10 at the position corresponding to the first concave tooth 12, and a second gear 14 is fixed to the position corresponding to the second concave tooth 13. The shaft 10 is driven to rotate by the first concave tooth 12 and the first gear 11 on the transmission belt 8, and the shaft 10 then drives the telescopic central rod 5 to move radially on the crescent-shaped frame 4 through the cooperation of the second gear 14 and the second concave tooth 13.

[0042] Please refer to it again. Figure 6 and Figure 8 As shown, the crescent-shaped frame 4 is also slidably connected with symmetrically arranged auxiliary support rods 22, which are used to assist the telescopic centering rod 5 in fixing the crescent-shaped frame 4 to the shaft system; the inner end of the auxiliary support rod 22 is rotatably connected with a roller 23, which is used to reduce the friction between the auxiliary support rod 22 and the shaft system.

[0043] Please refer to it again. Figure 9 , Figure 11 as well as Figure 12 As shown, a knob 28 is fixed to the outer side of the crescent-shaped frame 4 on the shaft 10; a plurality of first protrusions 21 in a circular array are fixed to the side of the knob 28 near the crescent-shaped frame 4; a plurality of second protrusions in a linear array are fixed to the side of the auxiliary support rod 22; the crescent-shaped frame 4 has matching recesses 24 at the positions of the first protrusions 21 and the second protrusions, which are used to increase the damping between the knob 28 and the crescent-shaped frame 4, and between the auxiliary support rod 22 and the crescent-shaped frame 4, to help fix their relative positions.

[0044] To facilitate understanding of the above-mentioned technical solutions of the present invention, the following provides a detailed description of the working principle or operation method of the single-gauge method in the process of adjusting the center of the water pump, motor, and coupling 3:

[0045] S100: Connect the pump shaft end 1 to the coupling 3 with bolts or connect the motor shaft end 2 to the coupling 3 to complete the initial connection and fixation.

[0046] S200: Align the notch of the crescent-shaped frame 4 with the pump shaft end 1, the motor shaft end 2, or the coupling 3 (hereinafter referred to as the shaft system for pump shaft end 1, motor shaft end 2, or coupling 3), and fit it onto one of the three.

[0047] It is worth noting here that when the pump shaft end 1 and the motor shaft end 2 are not directly connected by the full coupling 3 (both the pump shaft end 1 and the motor shaft end 2 have flange-type half couplings 3), the crescent-shaped frame 4 can be directly fitted onto one of them.

[0048] S300: Rotating the knob 28 clockwise causes one of the shafts 10 to rotate. When the shaft 10 rotates, it drives the transmission belt 8 to rotate through the engagement of the first gear 11 and the first concave tooth 12. The transmission belt 8 then drives all the other shafts 10 to rotate through the engagement of other sets of first gears 11 and first concave teeth 12. Finally, the shaft 10, in conjunction with the second gear 14 and the second concave tooth 13, drives all the telescopic centering rods 5 to slide on the crescent-shaped frame 4, so that the inner ends of all the telescopic centering rods 5 abut against the outer surface of the shaft system.

[0049] Among them, since the inner end of the telescopic centering rod 5 is provided with a raised texture 20, when the telescopic centering rod 5 abuts against the outer surface of the shaft system, it can increase the friction between the two, and prevent the crescent-shaped frame 4 from sliding on the shaft system, thus making the stability of the dial indicator body 27 worse.

[0050] S400: Rotate one of the following: pump shaft end 1, motor shaft end 2, and coupling 3 (shaft system without dial indicator body 27 mounted on bracket). Make fine adjustments to the corresponding shaft system according to the reading of dial indicator body 27 until the center of the shaft system is adjusted.

[0051] S500: Turn knob 28 counterclockwise to move telescopic centering rod 5 outwards in sync. After changing the position of crescent-shaped frame 4, turn knob 28 clockwise again to move telescopic centering rod 5 in sync, thus completing the fixation again.

[0052] When a secondary calibration of the shaft system is required, the inner end of the telescopic centering rod 5 is slidably connected to the guide rod 16, and the lower end of the guide rod 16 is connected to the ball bearing 19 via the contact block 17. Therefore, when the inner end of the telescopic centering rod 5 moves outward, the ball bearing 19 protrudes outward from the outside of the raised pattern 20 under the action of the spring 18, replacing the raised pattern 20 to abut against the shaft system (related to the degree of deformation of the spring 18). This keeps the crescent-shaped frame 4 and the shaft system coaxial, facilitating the maintenance personnel to make secondary adjustments to the position of the dial indicator, and without changing the fixed angle of the dial indicator body 27 bracket. This makes the secondary calibration result more reasonable, facilitates comparison with the primary calibration result, and avoids errors in the comparison result.

[0053] Furthermore, since the ball bearing 19 is controlled to extend and retract by the spring 18, when the inner end of the telescopic centering rod 5 approaches the shaft system, the ball bearing 19 is forced to retract into the deep groove 15, causing the ridge 20 to abut against the surface of the shaft system. This achieves relative fixation between the crescent-shaped fixing bracket and the shaft system, making the fixing method simple and convenient. Moreover, since all three telescopic centering rods 5 approach the shaft system simultaneously, when all three telescopic centering rods 5 are in contact with the shaft system at the same time, it can be considered that the crescent-shaped bracket 4 and the shaft system are coaxial. This coaxial state can be maintained during secondary or even tertiary fixing without the need for readjustment. Secondary centering is convenient, increasing the willingness of maintenance personnel to perform secondary alignment and shortening the time required for adjusting the wheel center when maintaining the coupling 3.

[0054] S600: Rotate the water pump shaft end 1, motor shaft end 2 and coupling 3 again (shaft system without dial indicator body 27 installed on the bracket). Compare the reading of dial indicator body 27 with the reading of dial indicator body 27 after the first alignment. If they are the same, the alignment of the shaft system wheel center is completed. If they are different, measurement and fine adjustment are required again.

[0055] In step S500, when the telescopic centering rod 5 moves outward, the spring 18 applies force to the ball bearing 19, causing the ball bearing 19 to abut against the shaft system. At this time, by adjusting the position of the auxiliary support rod 22, the roller 23 also abuts against the outer surface of the shaft system, thereby further improving the stability of the crescent-shaped frame 4. Since the knob 28 and the auxiliary support rod 22 engage with the groove through the first protrusion 21 and the groove through the second protrusion, damping is increased and a locking function is provided. Adjustment can be made when maintenance personnel apply force, which is convenient and quick. Example 2:

[0056] Please refer to it again. Figures 13-14 As shown, this utility model is a device for adjusting the center of the coupling of a horizontal water pump in a power plant. This embodiment is basically the same in structure as Embodiment 1, except that in this embodiment, the three-gauge method is used to center the couplings of the water pump shaft end 1, the motor shaft end 2, and the coupling 3.

[0057] Z100: The pump shaft end 1 and the motor shaft end 2 are initially connected and fixed using a full coupling 3 and bolts.

[0058] Z200: Align the notches of the two crescent-shaped frames 4 with the coupling 3, and fit them onto the coupling 3. Arrange the two dial gauge bodies 27 symmetrically along the axis of symmetry 25 to measure the outer circle of the water pump shaft end 1 and the outer circle of the motor shaft end 2, respectively.

[0059] Z300: Turn knob 28 clockwise to make the inner end of telescopic centering rod 5 fully abut against the outer surface of coupling 3.

[0060] Z400: Synchronously rotate the water pump shaft end 1, the motor shaft end 2, and the coupling 3. Make fine adjustments to the corresponding shaft system according to the reading of the dial indicator body 27 until the center adjustment of the shaft system is completed.

[0061] Z500: Turn knob 28 counterclockwise to move telescopic centering rod 5 outwards synchronously. After changing the position of crescent-shaped frame 4, turn knob 28 clockwise again to move telescopic centering rod 5 inwards synchronously, thus completing the fixation again. This makes the two dial indicator bodies 27 symmetrically arranged along the axis of symmetry 25 at their different positions on the coupling 3.

[0062] Z600: Rotate the pump shaft end 1, motor shaft end 2 and coupling 3 synchronously again. Compare the reading of dial indicator body 27 with the reading of dial indicator body 27 after the first alignment. If they are the same, the alignment of the shaft system wheel center is complete. If they are different, measurement and fine adjustment are required again.

[0063] Among them, the position of the dial indicator body 27 can be quickly adjusted by the cooperation of three sets of telescopic centering rods 5 that can slide on the crescent-shaped frame 4. Even when the three-indicator method (two sets of dial indicator bodies 27) is used to adjust the center of the shaft system, it can adapt to this more complex bracket installation method. Because it is convenient and simple, it not only greatly enhances the willingness of maintenance personnel to perform secondary alignment, but also shortens the time for adjusting the center of the coupling 3 when it is being maintained, making it suitable for widespread application.

[0064] It should be noted that, in this document, terms such as “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0065] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A coupling center adjustment device for a horizontal water pump maintenance system in a power plant, comprising a water pump shaft end (1) and a motor shaft end (2); a coupling (3) is provided between the water pump shaft end (1) and the motor shaft end (2); characterized in that: A crescent-shaped frame (4) is provided on the pump shaft end (1), motor shaft end (2) or coupling (3); three rectangular telescopic centering rods (5) are slidably provided on the crescent-shaped frame (4) in the radial direction. The telescopic centering rod (5) has a deep groove (15) on its inner end face; a guide rod (16) is slidably connected in the deep groove (15); a contact block (17) is fixedly connected to the lower end of the guide rod (16), and the contact block (17) can be retracted into the deep groove (15); a spring (18) is sleeved on the guide rod (16); a rotatable ball (19) is embedded in the center of the lower surface of the contact block (17); the telescopic centering rod (5) also has raised texture (20). A fixing block (26) is fixed to the outer surface of the crescent-shaped frame (4); a dial gauge body (27) is connected to the fixing block (26) via a bracket. The crescent-shaped frame (4) has a cavity (6) inside; there are multiple rotatably connected limiting shafts (7) arranged in an arc shape inside the cavity (6); a transmission belt (8) is rotatably connected to the limiting shafts (7); and a shaft (10) is rotatably connected to the cavity (6) at the position corresponding to the side of the telescopic centering rod (5). The transmission belt (8) is provided with a first concave tooth (12); the telescopic centering rod (5) is provided with a second concave tooth (13); a first gear (11) is fixedly connected to the shaft (10) at the position corresponding to the first concave tooth (12), and a second gear (14) is fixedly connected to the position corresponding to the second concave tooth (13). The crescent-shaped frame (4) is also fixed with an arc-shaped limiting block (9) at the position corresponding to the inner side of the limiting pivot (7). The crescent-shaped frame (4) is also slidably connected with symmetrically arranged auxiliary support rods (22); the inner end of the auxiliary support rods (22) is rotatably connected with rollers (23). The shaft (10) is fixed with a knob (28) on the outer side of the crescent-shaped frame (4); the knob (28) is fixed with a plurality of first protrusions (21) in a circular array on the side near the crescent-shaped frame (4); the auxiliary support rod (22) is fixed with a plurality of second protrusions in a linear array on the side; the crescent-shaped frame (4) is provided with matching recesses (24) at the positions of the first protrusions (21) and the second protrusions. Turn the knob (28) clockwise to rotate one of the shafts (10). When the shaft (10) rotates, it drives the transmission belt (8) to rotate through the cooperation of the first gear (11) and the first concave tooth (12). The transmission belt (8) then drives all the other shafts (10) to rotate through the cooperation of other sets of first gears (11) and first concave teeth (12). Finally, the shaft (10) cooperates with the second gear (14) and the second concave tooth (13) to drive all the telescopic centering rods (5) to slide on the crescent-shaped frame (4), so that the inner end of the telescopic centering rod (5) is completely in contact with the outer surface of the shaft system.

2. The device for adjusting the center of the coupling of a horizontal water pump in a power plant according to claim 1, characterized in that: When the inner end of the telescopic centering rod (5) moves outward, the ball (19) protrudes outward from the outside of the convex pattern (20) under the action of the spring (18), replacing the convex pattern (20) and abutting against the shaft system, thereby keeping the crescent-shaped frame (4) and the shaft system coaxial.

3. The device for adjusting the center of the coupling of a horizontal water pump in a power plant according to claim 1, characterized in that: When the inner end of the telescopic centering rod (5) moves closer to the shaft system, the ball (19) is forced to retract into the deep groove (15), so that the ridge (20) abuts against the surface of the shaft system, thereby achieving relative fixation between the crescent-shaped frame and the shaft system.

4. The device for adjusting the center of the coupling of a horizontal water pump in a power plant according to claim 1, characterized in that: Turn the knob (28) counterclockwise to move the telescopic centering rod (5) outward in sync. After changing the position of the crescent-shaped frame (4), turn the knob (28) clockwise again to move the telescopic centering rod (5) in sync in sync, thus completing the fixation again. The two dial indicator bodies (27) are symmetrically arranged along the axis of symmetry (25) again at different positions on the coupling (3).

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