A method for aligning a long shaft coupling

Abstract

The present application belongs to the technical field of long shaft coupling, and particularly relates to a method for aligning a long shaft coupling. The method comprises the following steps: firstly, coaxially connecting a middle long shaft and a coupling fan end together by using bolts; secondly, erecting an end of the middle long shaft on a rotating support as a free end, which is located at a side of a coupling motor end; thirdly, adjusting the position of the free end of the middle long shaft in the vertical direction and the horizontal direction; fourthly, adjusting the end of the middle long shaft, which is located at the side of the coupling motor end, to a central position; and finally, supporting and positioning the rotating support, and then aligning the coupling motor end and the middle long shaft according to a conventional method. The method has simple intermediate operation process, reduces the workload of construction personnel, and improves the alignment accuracy and work efficiency.

Description

Technical Field

[0001] This invention belongs to the technical field of long shaft couplings, and specifically relates to a method for aligning long shaft couplings. Background Technology

[0002] Coupling alignment is a crucial task in the installation, maintenance, and repair of rotating equipment, and is an essential prerequisite for ensuring its normal operation. The alignment method not only affects the accuracy of the alignment but also the workload and efficiency. Therefore, the method of coupling alignment is particularly important during equipment installation and maintenance. Currently, most cooling towers use axial flow fans. Due to the structural characteristics of axial flow fans, the span between the fan and the motor is relatively long, generally using an intermediate shaft, which can sometimes be over 5 meters long, with diaphragms or elastic pins connecting the two sides. Given the special nature of couplings with extended intermediate shafts, aligning couplings on the construction site is correspondingly more difficult compared to aligning couplings without extended intermediate shafts.

[0003] Chinese patent document CN110472329A (201910747334.8) discloses a method for aligning an intermediate extended shaft coupling. The left side of the intermediate extended shaft is the fan end of the coupling, and the right side is the motor end of the coupling. The two ends of the intermediate extended shaft are connected to the fan end of the coupling on the left and the motor end of the coupling on the right respectively through an axial alignment method. A dial indicator is installed on both sides of the intermediate extended shaft and the fan end of the coupling, and on both sides of the intermediate extended shaft and the motor end of the coupling. The axial deviation between the axes is calculated by the axial alignment method to adjust the center deviation between the motor and the intermediate shaft, thereby quickly connecting the intermediate extended shaft to the motor end of the coupling and the fan end of the coupling. The above method requires setting up a dial indicator on both sides of the intermediate extended shaft and the fan end of the coupling, and on both sides of the intermediate extended shaft and the motor end of the coupling. During alignment, it is necessary to ensure that both ends of the intermediate extended shaft meet the requirements at the same time, that is, the axis of the intermediate extended shaft and the motor end of the coupling and the fan end of the coupling must be on the same straight line. Therefore, it is necessary to make multiple adjustments to both ends of the intermediate extended shaft, which takes a long time to align. Summary of the Invention

[0004] The main objective of this invention is to provide a method for aligning long-shaft couplings. This invention first connects the intermediate extended shaft to the fan end of the coupling using bolts. The end of the intermediate extended shaft located on the motor end side of the coupling is mounted on a rotating bracket as a free end. By adjusting the vertical and horizontal positions of the free end of the intermediate extended shaft, the end of the intermediate extended shaft on the motor end side of the coupling is adjusted to the center position. The rotating bracket is used for support and positioning. Then, the motor end of the coupling and the intermediate extended shaft are aligned using conventional methods. This method simplifies the operation process, reduces the workload of construction personnel, and improves alignment accuracy and work efficiency.

[0005] The technical problem to be solved by this invention is achieved by the following technical solution: a method for aligning a long shaft coupling, comprising the following steps: The long shaft coupling includes an intermediate extended shaft, a coupling fan end, and a coupling motor end. The left side of the intermediate extended shaft is the coupling fan end, and the right side of the intermediate extended shaft is the coupling motor end. The coupling fan end is installed on the fan, and the coupling motor end is installed on the motor. When aligning the long shaft coupling, the motor end of the coupling is used as the adjustment end. The intermediate extended shaft is coaxially connected to the fan end of the coupling with bolts. The end of the intermediate extended shaft located on the motor end side of the coupling is mounted on a rotating bracket as a free end. The intermediate extended shaft is mounted on the rotating bracket and can rotate freely. By adjusting the position of the free end of the intermediate extension shaft in the vertical and horizontal directions, the end of the intermediate extension shaft located on the motor end side of the coupling is adjusted to the center position, and the rotating bracket is used for support and positioning to eliminate the errors caused by bearing clearance and shaft sagging. Install two dial indicators, one axial and one radial, on the motor end or the free end of the extended shaft in the middle of the coupling to measure the motor in both axial and radial directions, and make adjustments to meet the installation requirements. Then connect the extended shaft to the motor end of the coupling. After determining the center, use a rotating bracket to support and position the extended shaft to ensure its stability and reliability, preventing wobbling. Only the position of the motor needs to be adjusted, simplifying the alignment of the long shaft coupling to that of a conventional coupling.

[0006] In a preferred embodiment of the present invention, the method for adjusting the position of the free end of the intermediate extension shaft in the vertical and horizontal directions is as follows: two dial indicators are installed in the vertical and horizontal directions at the fan end of the coupling. By comparing the distance the free end of the intermediate extension shaft moves in the vertical and horizontal directions with the dial indicator runout in the corresponding directions, when the ratio of the two is within a preset range, the free end of the intermediate extension shaft is supported and fixed by a rotating bracket.

[0007] Preferably, the end of the intermediate extension shaft located on the motor end of the coupling is adjusted to the center position so that the center line of the intermediate extension shaft coincides with the center line of the fan bearing.

[0008] The preferred method of this invention for measuring the motor in both axial and radial directions is to measure the coaxiality and concentricity of the motor end of the coupling and the intermediate extended shaft.

[0009] Preferably, the rotating bracket of the present invention includes an upward-opening V-shaped groove, and the intermediate extended shaft is rotatably disposed within the V-shaped groove.

[0010] Preferably, the V-groove is provided with rollers on its front side, with two rollers respectively positioned on either side of the apex of the V-groove. The rollers are mounted on a rotating bracket and can slide back and forth along the vertical direction of the sidewall of the V-groove. The two rollers being positioned on either side of the apex of the V-groove can reduce the friction of the intermediate extended shaft during rolling. Since the rollers can slide back and forth along the vertical direction of the sidewall of the V-groove on the rotating bracket, the position of the free end of the intermediate extended shaft can be finely adjusted in both the vertical and horizontal directions.

[0011] Preferably, the base of the rotating bracket is provided with fixing bolts, and a height adjustment plate is provided below the base of the rotating bracket. The height adjustment plate is provided with fixing holes that mate with the fixing bolts. The fixing bolts of the rotating bracket base are used to adjust and fix the position of the rotating bracket to ensure the stability of the intermediate extension shaft; the height adjustment plate can be used to adjust the vertical position of the intermediate extension shaft.

[0012] In a preferred embodiment of the present invention, the method of installing two dial indicators, one axial and one radial, at the motor end or the free end of the intermediate extended shaft of the coupling is as follows: one side wall of the U-shaped bracket is fixed to the flange at the motor end or the free end of the intermediate extended shaft of the coupling with bolts, and a dial indicator is installed at the bottom of the U-shaped bracket and on the other side wall of the U-shaped bracket respectively. The U-shaped bracket includes two parallel side plates and a base plate perpendicular to the side plates, with the base plate located between the two side plates. Because the U-shaped bracket includes two parallel side plates and a base plate perpendicular to the side plates, it allows for quick installation and disassembly, and allows two dial indicators to be mounted perpendicularly on the U-shaped bracket, simultaneously measuring axial and radial runout.

[0013] Preferably, the long shaft coupling of this invention is a diaphragm coupling, and the bolts connecting the intermediate extended shaft to the fan end of the coupling are diaphragm pin bolts. Using the pin bolts of the diaphragm coupling to connect the intermediate extended shaft to the fan end of the coupling ensures the coaxiality of the two shafts and improves the alignment accuracy of the long shaft coupling.

[0014] In a preferred embodiment of the present invention, the method of mounting two dial indicators in the vertical and horizontal directions at the fan end of the coupling is as follows: the dial indicators are mounted on the fan body via magnetic bases.

[0015] Compared with the prior art, the beneficial effects of the present invention are: In this invention, during the alignment of a long-shaft coupling, the motor end of the coupling is used as the adjustment end. An intermediate extended shaft is coaxially connected to the fan end of the coupling using bolts. The end of the intermediate extended shaft located on the motor end side of the coupling is mounted on a rotating bracket as a free end. The intermediate extended shaft is rotatably mounted on the rotating bracket. By adjusting the vertical and horizontal positions of the free end of the intermediate extended shaft, the end on the motor end side of the coupling is centered. The rotating bracket provides support and positioning. Two dial indicators, one axial and one radial, are installed on either the motor end of the coupling or the free end of the intermediate extended shaft to measure the motor in both axial and radial directions and make adjustments to meet installation requirements. Finally, the intermediate extended shaft is connected to the motor end of the coupling, thus achieving the alignment of the long-shaft coupling.

[0016] This invention changes the alignment process from aligning both ends of the intermediate extended shaft to aligning only the motor end of the coupling. This invention provides precise alignment, is easy to operate, improves work efficiency, and significantly reduces workload. Attached Figure Description

[0017] Figure 1 This is a schematic diagram illustrating the implementation of the long shaft coupling alignment method described in this invention; Figure 2 This is a schematic diagram of the rotating support described in this invention; Figure 3 This is a schematic diagram of the U-shaped bracket described in this invention; In the diagram, 100 is the extended shaft in the middle, 200 is the fan end of the coupling, 300 is the motor end of the coupling, 400 is the fan, and 500 is the motor. 600 rotating bracket, 601 V-groove, 700 dial indicator, 800 roller, 900 U-shaped bracket. Detailed Implementation

[0018] The technical solutions in the embodiments of the present invention will now be clearly and completely described in conjunction with the accompanying drawings.

[0019] The specific method of using the dial indicator in this invention is existing technology and will not be described in detail here.

[0020] like Figures 1-3 As shown, a method for aligning a long shaft coupling includes the following steps: The long shaft coupling includes an intermediate extended shaft 100, a coupling fan end 200, and a coupling motor end 300. The left side of the intermediate extended shaft is the coupling fan end, and the right side of the intermediate extended shaft is the coupling motor end. The coupling fan end is installed on the fan 400, and the coupling motor end is installed on the motor 500.

[0021] During the alignment of the long shaft coupling, the motor end of the coupling is used as the adjusting end. The intermediate extended shaft is coaxially connected to the fan end of the coupling using bolts. The end of the intermediate extended shaft located on the motor end side of the coupling is mounted on the rotating bracket 600 as a free end, allowing the intermediate extended shaft to rotate freely on the rotating bracket. In this embodiment, the intermediate extended shaft 100 is connected to both the fan end 200 and the motor end 300 of the coupling using flanges. Therefore, the coaxial connection between the intermediate extended shaft 100 and the fan end 200 of the coupling can be ensured by multiple bolts arranged circumferentially along the flange.

[0022] By adjusting the position of the free end of the intermediate extension shaft in the vertical and horizontal directions, the end of the intermediate extension shaft located on the motor side of the coupling is adjusted to the center position, and the rotating bracket is used for support and positioning.

[0023] Install two 700 dial indicators (axial and radial) at the motor end or the free end of the intermediate extended shaft of the coupling to measure the motor in both axial and radial directions, and adjust it to meet the installation requirements. The method for adjusting the motor position is existing technology and will not be described in detail here.

[0024] Then connect the intermediate extended shaft to the motor end of the coupling.

[0025] The method for adjusting the position of the free end of the intermediate extension shaft in the vertical and horizontal directions is as follows: two dial indicators are installed in the vertical and horizontal directions at the fan end of the coupling. By comparing the distance the free end of the intermediate extension shaft moves in the vertical and horizontal directions with the corresponding dial indicator runout, when the ratio of the two is within the preset range, the free end of the intermediate extension shaft is supported and fixed by a rotating bracket.

[0026] Adjust the end of the intermediate extension shaft located on the motor side of the coupling to the center position, so that the center line of the intermediate extension shaft coincides with the center line of the fan bearing.

[0027] The method for measuring the motor in both axial and radial directions is as follows: measure the coaxiality and concentricity between the motor end of the coupling and the intermediate extended shaft.

[0028] like Figure 2 As shown, the rotating bracket 600 includes an upward-opening V-shaped groove 601, and the intermediate extended shaft is rotatably disposed in the V-shaped groove.

[0029] A roller 800 is provided on the front side of the V-shaped groove. Two rollers are respectively located on both sides of the apex of the V-shaped groove. The surface of the roller is set higher than the surface of the V-shaped groove. The roller is mounted on the rotating bracket and can slide back and forth along the vertical direction of the side wall of the V-shaped groove.

[0030] Specifically, the rotating bracket 600 includes a vertical support plate, two rotating support rods slidably mounted on the vertical support plate, and rollers rotatably mounted on the upper ends of the rotating support rods via a rotating shaft. The vertical support plate has an axially oriented elongated adjustment hole in the middle. Two rows of linearly arranged bolt connection holes are provided on both sides of the V-groove of the vertical support plate, with each row including two or more bolt connection holes. The adjustment hole is connected to the two bolt connection holes via fasteners. The extended lines of the axes of the two rotating support rods intersect obliquely upwards.

[0031] The base of the rotating bracket is equipped with fixing bolts, and a height adjustment plate is located below the base of the rotating bracket. The height adjustment plate has fixing holes that mate with the fixing bolts. The height adjustment plate allows the height of the rotating bracket to be adjusted, while the fixing bolts allow the rotating bracket to be fixed to the ground and its position to be adjusted.

[0032] like Figure 3 As shown, the method for installing two dial indicators, one axial and one radial, on the motor end or the free end of the intermediate extended shaft of the coupling is as follows: one side wall of the U-shaped bracket 900 is fixed to the flange of the motor end or the free end of the intermediate extended shaft of the coupling with bolts, and a dial indicator is installed on the bottom of the U-shaped bracket and on the other side wall of the U-shaped bracket.

[0033] The U-shaped bracket includes two parallel side plates and a base plate perpendicular to the side plates, with the base plate located between the two side plates.

[0034] The long shaft coupling is a diaphragm coupling, and the bolts connecting the intermediate extended shaft to the fan end of the coupling are diaphragm pin bolts.

[0035] The method for installing two dial indicators in the vertical and horizontal directions at the fan end of the coupling is as follows: the dial indicators are installed on the fan body through magnetic bases.

[0036] This invention solves the problem of aligning long shaft couplings, achieving precise alignment and simple operation, thus improving work efficiency and accuracy while reducing workload.

Claims

1. A method for aligning a long shaft coupling, characterized in that, Includes the following steps: The long shaft coupling includes an intermediate extended shaft (100), a coupling fan end (200), and a coupling motor end (300). The coupling fan end (200) is mounted on a fan (400), and the coupling motor end (300) is mounted on a motor (500). When aligning a long-shaft coupling, use the motor end (300) of the coupling as the adjusting end. First, fix the intermediate extension shaft (100) to the fan end (200) of the coupling so that the two are coaxial; The end of the intermediate extended shaft (100) located on the side of the motor end (300) of the coupling is used as the free end and is mounted on a rotating bracket (600) that can rotate freely. By adjusting the position of the free end of the intermediate extended shaft in the vertical and horizontal directions, the free end of the intermediate extended shaft (100) is adjusted to the center position that coincides with the bearing center line of the fan, and the free end is supported and positioned by the rotating bracket (600) to eliminate the error caused by bearing clearance and shaft sagging. The method for adjusting the position of the free end of the intermediate extension shaft in the vertical and horizontal directions is as follows: two dial indicators are installed in the vertical and horizontal directions at the fan end of the coupling. By comparing the distance the free end of the intermediate extension shaft moves in the vertical and horizontal directions with the corresponding dial indicator runout, when the ratio of the two is within the preset range, the free end of the intermediate extension shaft is supported and fixed by a rotating bracket. Two dial indicators (700) are installed on the free end of the intermediate extended shaft (100) or the motor end (300) of the coupling, one for axial and one for radial, to measure the motor (500) in both axial and radial directions, and to adjust the position of the motor (500) until the installation requirements are met. Finally, the free end of the intermediate extended shaft (100) is connected to the motor end (300) of the coupling.

2. The method for aligning a long shaft coupling according to claim 1, characterized in that: The method for measuring the motor in both axial and radial directions is as follows: measure the coaxiality and concentricity between the motor end of the coupling and the intermediate extended shaft.

3. The method for aligning a long shaft coupling according to claim 1, characterized in that: The rotating bracket includes an upward-opening V-shaped groove, and the intermediate extended shaft is rotatably disposed within the V-shaped groove.

4. The method for aligning a long shaft coupling according to claim 3, characterized in that: A roller is provided on the front side of the V-shaped groove. Two rollers are respectively located on both sides of the apex of the V-shaped groove. The rollers are mounted on the rotating bracket and can slide back and forth along the vertical direction of the side wall of the V-shaped groove.

5. The method for aligning a long shaft coupling according to claim 1, characterized in that: The base of the rotating bracket is provided with fixing bolts, and a height adjustment plate is provided below the base of the rotating bracket. The height adjustment plate is provided with fixing holes that cooperate with the fixing bolts.

6. The method for aligning a long shaft coupling according to claim 1, characterized in that: The method for installing two dial indicators, one axial and one radial, at the motor end or the free end of the intermediate extended shaft of the coupling is as follows: one side wall of the U-shaped bracket is fixed to the flange at the motor end or the free end of the intermediate extended shaft of the coupling with bolts, and one dial indicator is installed at the bottom of the U-shaped bracket and on the other side wall of the U-shaped bracket respectively. The U-shaped bracket includes two parallel side plates and a base plate perpendicular to the side plates, with the base plate located between the two side plates.

7. The method for aligning a long shaft coupling according to claim 1, characterized in that: The long shaft coupling is a diaphragm coupling, and the bolts connecting the intermediate extended shaft to the fan end of the coupling are diaphragm pin bolts.

8. The method for aligning a long shaft coupling according to claim 1, characterized in that: The method for installing two dial indicators in the vertical and horizontal directions at the fan end of the coupling is as follows: the dial indicators are installed on the fan body through magnetic bases.

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