Tool for pushing pump shaft of vertical pump
By designing a vertical pump shaft centering fixture that includes a split bottom plate, an upper support ring, and adjusting top screws, the problems of high operational difficulty and low precision during the centering process of large vertical pumps were solved, achieving efficient and safe centering operation and reducing the risk of equipment damage and construction period.
Patent Information
- Application Number
- CN202510971503.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-15
- Publication Date
- 2025-11-14
AI Technical Summary
Large vertical pumps have problems such as heavy components, difficulty in operation, low adjustment accuracy, long time consumption, and inconvenience in real-time observation during the pushing process, resulting in waste of construction period and manpower, as well as the risk of equipment damage.
A tooling for pushing the pump shaft of a vertical pump is adopted, including a split base plate, an upper support ring, adjusting screws and adjusting blocks. Symmetrical installation and adjustment are achieved through threaded connection. A dial indicator is used to monitor the pushing process in real time to ensure that the upper and lower pump shafts are adjusted synchronously.
The operation process was simplified, the adjustment accuracy and efficiency were improved, the risk of equipment damage was reduced, the workload and construction period were shortened, and the controllability and accuracy of the pushing process were ensured.
Smart Images
Figure CN120941306A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of nuclear power plant pump equipment maintenance technology, specifically relating to a tooling for a vertical pump shaft pusher. Background Technology
[0002] Common problems encountered during the centering of large vertical pump shafts include: Due to their large size, high precision, and heavy weight, large vertical pumps are difficult to move. Centering is difficult to control, easily leading to excessive movement and repeated adjustments, wasting manpower and time. The movement during centering is not uniform, making real-time observation of dial indicator readings difficult; judgment must be made manually, resulting in poor accuracy. The entire maintenance process is time-consuming and difficult to control, prone to human error.
[0003] In summary, existing methods for centering large vertical pumps suffer from several drawbacks: heavy and difficult-to-operate components, low adjustment accuracy, long processing time, and difficulty in real-time monitoring. These methods not only waste time, manpower, and resources but also pose a risk of equipment damage. Therefore, a new tooling and method are urgently needed to address these issues in order to facilitate convenient, fast, safe, and effective centering of large vertical pumps. Summary of the Invention
[0004] The purpose of this invention is to provide a tooling for pushing the shaft of a vertical pump, which improves the quality and efficiency of on-site maintenance, effectively avoids the waste of manpower, material resources and time caused by repeated adjustment and disassembly of dial indicators during the pushing of the shaft of a vertical pump, and also greatly reduces the skill threshold.
[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A tooling for a vertical pump shaft pusher includes a split base plate, upper support rings, adjusting screws, and adjusting blocks. Two upper support rings are symmetrically mounted on the split base plate. The adjusting screws are connected to the upper support rings, and the adjusting blocks are connected to the adjusting screws.
[0006] The split base plate is a ring composed of two identical semicircular rings.
[0007] The two upper support rings adopt the same arc-shaped structure.
[0008] The upper support ring is connected to the split bottom plate by connecting bolts.
[0009] The outer diameter of the inner ring of the split bottom plate is larger than the outer diameter of the pump shaft, and the outer ring is provided with a threaded hole for connection with the upper support ring.
[0010] The adjusting screw is connected to the upper support ring via a thread.
[0011] The adjusting stop is connected to the adjusting set screw via a thread.
[0012] The upper support ring is connected across the two semicircular rings of the split bottom plate.
[0013] Fix the split base plate to the lower part of the vertical pump shaft, and install the upper support ring on the split base plate. Install a dial indicator on the outer surface of the pump shaft. After installation, label the four adjusting screws as X1, Y1, X2, and Y2, where X1 and X2 are opposite screws, and Y1 and Y2 are opposite screws. Adjust the position of the adjusting block by rotating adjusting screw X1 until the upper and lower pump shafts are pushed to the farthest point and the dial indicator pointer no longer moves. Record the dial indicator reading A1 at this point. Loosen adjusting screw X1, rotate the opposite adjusting screw X2, and similarly push the upper and lower pump shafts to the farthest point until the dial indicator pointer no longer moves. Record the dial indicator reading A2 at this point. Loosen adjusting screw X2, and then slowly push the pump shaft by adjusting screw X1. Observe the dial indicator reading. When the reading is (A1+A2) / 2, it indicates that the pump shaft has been successfully centered in the X direction. Adjust the position of the adjusting block by rotating the adjusting screw Y1, and push the upper and lower pump shafts to the farthest point. The dial indicator pointer should no longer change. Record the dial indicator reading B1 at this time. Loosen the adjusting screw Y1, and rotate the adjusting screw Y2 on the opposite side. Similarly, push the upper and lower pump shafts to the farthest point. The dial indicator pointer should no longer change. Record the dial indicator reading B2 at this time. Loosen the adjusting screw Y2, and then slowly push the pump shaft by adjusting the adjusting screw Y1. Observe the dial indicator reading. When the reading is (B1+B2) / 2, it indicates that the pump shaft has been successfully centered in the Y direction. Perform a test on the upper and lower pump shafts to verify that their outer diameter deviation is ≤0.03mm.
[0014] The dial indicators are arranged at 90° intervals, and their positions are close to those of the adjusting screws.
[0015] The beneficial effects achieved by this invention are as follows: This invention simplifies and streamlines the vertical pump shaft centering process, making it simpler and more efficient. Its advantages include: Reduced equipment damage risk: The tooling simplifies the operation, making it more intuitive and controllable, thus reducing the risk of equipment damage due to human error. Reduced workload: Using this tooling allows for synchronous adjustment of the upper and lower pump shafts, reducing workload by 50%. Shorter construction period: The tooling's simple operation and ability to synchronously adjust the upper and lower pump shafts significantly shorten the construction period. Improved accuracy: The tooling allows for centering via adjusting the set screws, resulting in very uniform dial indicator changes during adjustment, facilitating real-time observation of dial indicator readings and improving adjustment accuracy. Reduced risk of repetitive maintenance: The improved adjustment accuracy ensures controllable pushing amount for each operation, avoiding repeated adjustments due to excessive pushing. Attached Figure Description
[0016] Figure 1 This is a tooling structure diagram for a vertical pump shaft thruster; Figure 2 A schematic diagram illustrating the tooling usage method in a vertical pump shaft thruster; In the diagram: 1-half base plate; 2-upper support ring; 3-connecting bolt; 4-adjusting screw; 5-adjusting stop. Detailed Implementation
[0017] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.
[0018] like Figure 1 As shown, a tooling for pushing the pump shaft of a vertical pump includes a split base plate 1, an upper support ring 2, connecting bolts 3, adjusting screws 4, and adjusting blocks 5. The split base plate 1 is a ring composed of two identical semicircular rings, with the outer diameter of its inner ring larger than the outer diameter of the pump shaft to allow for adjustment. Its outer ring has threaded holes for connection with the upper support ring 2. There are two upper support rings 2, each with the same arc design, symmetrically mounted on the split base plate 1, forming part of the tooling bracket and used to install the adjusting screws 4 and a dial indicator. The connecting bolts 3 connect the split base plate 1 to the upper support ring 2. The adjusting screws 4 are threaded to the upper support ring 2, and their feed can be adjusted by rotation. The adjusting blocks 5 are threaded to the adjusting screws 4 and can directly contact both the upper and lower shafts of the vertical pump, used to push the pump shaft for centering. All connections between components are threaded or bolted, facilitating assembly and disassembly.
[0019] like Figure 2As shown, a method for using a tooling for pushing a vertical pump shaft is as follows: The split base plate 1 is fixed to the lower part of the vertical pump shaft. The upper support ring 2 is installed on the split base plate 1 using connecting bolts 3. It is important to note that each upper support ring 2 must span across the two semicircular rings of the split base plate 1 to ensure connection. A dial indicator is installed on the outer surface of the pump shaft to determine the pushing status. Note that two dial indicators should be placed at 90° intervals, and their positions should be as close as possible to the adjusting screws 4. After installation, the four adjusting screws 4 are designated as X1, Y1, X2, and Y2, where X1 and X2 are opposite screws, and Y1 and Y2 are opposite screws. By rotating adjusting screw X1, the position of the adjusting stop 5 is adjusted, pushing the upper and lower pump shafts to their farthest points until the dial indicator pointer no longer changes. The dial indicator reading A1 is recorded at this point. Loosen adjusting screw X1, and rotate adjusting screw X2 on the opposite side to push the upper and lower pump shafts to their furthest points. The dial indicator needle should no longer move; record the dial indicator reading A2 at this point. Loosen adjusting screw X2, and then slowly push the pump shaft using adjusting screw X1. Observe the dial indicator reading. When the reading is (A1+A2) / 2, it indicates that the pump shaft has been successfully centered in the X direction. Adjust the position of adjusting stop 5 by rotating adjusting screw Y1 to push the upper and lower pump shafts to their furthest points. The dial indicator needle should no longer move; record the dial indicator reading B1 at this point. Loosen adjusting screw Y1, and rotate adjusting screw Y2 on the opposite side to push the upper and lower pump shafts to their furthest points. The dial indicator needle should no longer move; record the dial indicator reading B2 at this point. Loosen adjusting screw Y2, and then slowly push the pump shaft using adjusting screw Y1. Observe the dial indicator reading. When the reading is (B1+B2) / 2, it indicates that the pump shaft has been successfully centered in the Y direction. The upper and lower pump shafts are aligned and their outer diameter deviation is verified to be ≤0.03mm.
Claims
1. A tooling for a vertical pump shaft thruster, characterized in that: It includes a split base plate, an upper support ring, an adjusting screw, and an adjusting block. Two upper support rings are symmetrically installed on the split base plate. The adjusting screw is connected to the upper support ring, and the adjusting block is connected to the adjusting screw.
2. The tooling in the vertical pump shaft thruster according to claim 1, characterized in that: The split base plate is a ring composed of two identical semicircular rings.
3. The tooling in the vertical pump shaft thruster according to claim 1, characterized in that: The two upper support rings adopt the same arc-shaped structure.
4. The tooling in the vertical pump shaft thruster according to claim 1, characterized in that: The upper support ring is connected to the split bottom plate by connecting bolts.
5. The tooling in the vertical pump shaft thruster according to claim 1, characterized in that: The outer diameter of the inner ring of the split bottom plate is larger than the outer diameter of the pump shaft, and the outer ring is provided with a threaded hole for connection with the upper support ring.
6. The tooling in the vertical pump shaft thruster according to claim 1, characterized in that: The adjusting screw is connected to the upper support ring via a thread.
7. The tooling in the vertical pump shaft thruster according to claim 1, characterized in that: The adjusting stop is connected to the adjusting set screw via a thread.
8. The tooling in the vertical pump shaft thruster according to claim 2, characterized in that: The upper support ring is connected across the two semicircular rings of the split bottom plate.
9. A method for pushing the shaft of a vertical pump, characterized in that: Fix the split base plate to the lower part of the vertical pump shaft, and install the upper support ring on the split base plate. Install a dial indicator on the outer surface of the pump shaft. After installation, label the four adjusting screws as X1, Y1, X2, and Y2, where X1 and X2 are opposite screws, and Y1 and Y2 are opposite screws. Adjust the position of the adjusting block by rotating adjusting screw X1 until the upper and lower pump shafts are pushed to the farthest point and the dial indicator pointer no longer moves. Record the dial indicator reading A1 at this point. Loosen adjusting screw X1, rotate the opposite adjusting screw X2, and similarly push the upper and lower pump shafts to the farthest point until the dial indicator pointer no longer moves. Record the dial indicator reading A2 at this point. Loosen adjusting screw X2, and then slowly push the pump shaft by adjusting screw X1. Observe the dial indicator reading. When the reading is (A1+A2) / 2, it indicates that the pump shaft has been successfully centered in the X direction. Adjust the position of the adjusting block by rotating the adjusting screw Y1, and push the upper and lower pump shafts to the farthest point. The dial indicator pointer should no longer change. Record the dial indicator reading B1 at this time. Loosen the adjusting screw Y1, and rotate the adjusting screw Y2 on the opposite side. Similarly, push the upper and lower pump shafts to the farthest point. The dial indicator pointer should no longer change. Record the dial indicator reading B2 at this time. Loosen the adjusting screw Y2, and then slowly push the pump shaft by adjusting the adjusting screw Y1. Observe the dial indicator reading. When the reading is (B1+B2) / 2, it indicates that the pump shaft has been successfully centered in the Y direction. Perform a test on the upper and lower pump shafts to verify that their outer diameter deviation is ≤0.03mm.
10. The method for pushing the shaft of a vertical pump according to claim 9, characterized in that: The dial indicators are arranged at 90° intervals, and their positions are close to those of the adjusting screws.