Large vertical axial flow pump impeller head overhauling device

Abstract

The invention discloses a large vertical axial flow pump impeller head overhauling device, and relates to the technical field of impeller head overhauling devices, the large vertical axial flow pump impeller head overhauling device comprises two bases, the top of each base is connected with a jacking oil cylinder, the top of each base is provided with a first jacking chain wheel, and the top of each base is provided with a side frame. Through precise control of the jacking system, safe and stable lifting of the impeller head and rapid clamping and loosening of the hydraulic rod are achieved, the maintenance efficiency is improved, and it is ensured that the impeller head is stable. According to the device, the safety and efficiency of overhaul work are remarkably improved, and the maintenance requirements of modern industry are met.

Description

Technical Field

[0001] This invention relates to the field of impeller head maintenance devices, and more particularly to a large vertical axial flow pump impeller head maintenance device. Background Technology

[0002] Large and medium-sized vertical water pump units have advantages such as mature technology, high reliability, excellent operating condition regulation performance, low guide bearing load, and good motor operating environment. They are widely used in large-scale water conservancy projects, inter-basin water transfer projects, agricultural irrigation, urban water supply and drainage systems, industrial production water and energy fields.

[0003] To ensure the reliability of the project's operation, a major overhaul of one main water pump is required annually. Depending on the scope of the overhaul, it can be divided into two main categories: general overhaul and extended overhaul. During a general overhaul, the impeller is disassembled and lifted using a "well"-shaped support frame (as shown in Figure 8 of Chinese Patent 202410983944.9). If core components such as the impeller experience seal aging or damage, requiring the impeller to be returned to the factory for repair, an extended overhaul is performed. Compared to a general overhaul, an extended overhaul adds the following steps: ① impeller disassembly, inspection, and repair; ② impeller static balance test; ③ impeller hydraulic test; ④ guide vane removal and shaft wear machining.

[0004] In process ④, the removal and installation of the guide vane body adds the steps of removing, hoisting, and reinstalling components such as the pump cover, special-shaped pipe, and guide vane body. Due to the complexity of the process and the fact that the disassembly, transportation, and assembly work are carried out using only simple tooling, the construction period is increased by about 25 days.

[0005] It is evident that the current maintenance of large and medium-sized water pump units primarily relies on traditional methods, mainly manual labor supplemented by simple disassembly tools. This approach is time-consuming, labor-intensive, inefficient, and raises significant safety concerns during the maintenance process. The long maintenance time and massive workload of large and medium-sized water pump units result in high maintenance costs, and safety hazards exist during the maintenance process. Particularly during drought and flood control, if the impeller fails, extensive overhauls are required, which will severely impact the timely commissioning of the main pump, the normal operation of the project, and the overall water situation management. Summary of the Invention

[0006] To address the above problems, this invention provides a large-scale vertical axial flow pump impeller head maintenance device that improves maintenance efficiency and shortens the construction period.

[0007] The present invention adopts the following technical solution: a large vertical axial flow pump impeller head maintenance device, comprising two bases, a lifting cylinder connected to the top of the base, a first lifting sprocket installed on the top of the base, a side frame installed on the top of the base, a groove opened on the top of the side frame, a second lifting sprocket provided on the inner wall of the groove, a U-shaped lifting slider slidably connected to the inner wall of the side frame, the lifting cylinder being connected to a chain, and the chain being connected to the lifting slider via the first and second lifting sprockets; Clamping systems are provided on opposite sides of the two lifting sliders. Two fixed steel beams are connected to both sides of the two side frames. A lifting connecting steel beam is connected between the outer surfaces of the two lifting sliders. An impeller head is placed between the two clamping systems. A drive wheel is provided at the bottom of the base.

[0008] The clamp system includes a U-shaped support shell. The lifting slider has L-shaped support blocks arranged symmetrically at both ends, and the support shell is movably mounted on a pair of L-shaped support blocks; The inner wall of the support shell is provided with a sliding groove, and the inner wall of the sliding groove is connected to two limiting plates and a baffle.

[0009] An arc plate is slidably connected between one side of the two limiting plates. Two support plates are connected to one side of the arc plate, and an arc block is connected to one side of the support plate. One side of the arc block is connected to the outer surface of the arc plate.

[0010] Two limiting telescopic rods are connected to one side of the arc-shaped block. One end of the limiting telescopic rod is connected to the inner wall of the slide groove. A damping telescopic rod is connected to one side of the arc-shaped block. One end of the damping telescopic rod is connected to the inner wall of the slide groove.

[0011] A spring is provided on the outer surface of the damping telescopic rod. One end of the spring is connected to one side of the arc-shaped block, and the other end of the spring is connected to the inner wall of the slide groove.

[0012] The outer surface of the support plate is slidably connected to the inner wall of the slide groove, and the outer surface of the arc-shaped block is slidably connected to the inner wall of the slide groove.

[0013] The clamp system also includes a hydraulic rod, one side of which is connected to one side of the lifting slider, and the output end of which is connected to one side of the support shell.

[0014] The top and bottom of the side frame are respectively provided with receiving grooves, and the outer surface of the lifting slider is provided with an embedded groove. Two fixed steel beams are respectively installed in the receiving grooves at the top and bottom of the side frame. The lifting connecting steel beam is used to embed into the groove of the lifting slider. A sliding plate is installed between the two fixed steel beams. The lifting connecting steel beam is located between two fixed steel beams and is slidably connected to the sliding plate.

[0015] In operation, this invention, through the cooperation of a lifting cylinder, a first lifting sprocket, a second lifting sprocket, and a lifting slider, can achieve precise lifting and lowering of the impeller head, ensuring the safety and stability of the equipment during the lifting and lowering process; The application of hydraulic rods enables the clamping and loosening of the clamping system, allowing for rapid response during maintenance. This not only improves maintenance efficiency but also prevents deformation or damage to the impeller head caused by improper clamping during the clamping process, achieving a safe and fast clamping effect. This invention plays an important role in shortening the overhaul period, improving maintenance efficiency, ensuring maintenance quality, and guaranteeing the normal operation and benefits of pumping station projects. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a side view of the structure of the present invention; Figure 3 This is a schematic diagram of the clamp system structure in this invention; Figure 4 This is a cross-sectional view of the clamp system in this invention; Figure 5 This is an exploded structural diagram of the clamp system in this invention; Figure 6 This is an exploded side view of the clamp system in this invention; Figure 7 This is a schematic diagram of the connection structure between the lifting connecting steel beam and the fixed steel beam in this invention; Legend: 1. Base; 2. Clamping system; 3. Lifting cylinder; 4. First lifting sprocket; 5. Side frame; 6. Second lifting sprocket; 7. Lifting slider; 8. Lifting connecting steel beam; 9. Fixed steel beam; 10. Drive wheel; 11. Impeller head; 12. Slide plate; 21. Support shell; 22. Slide groove; 23. Limiting plate; 24. Baffle; 25. Arc plate; 26. Support plate; 27. Arc block; 28. Limiting telescopic rod; 29. ​​Damping telescopic rod; 210. Spring; 211. Hydraulic rod. Detailed Implementation

[0017] 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.

[0018] like Figure 1-7 As shown, the present invention provides a large vertical axial flow pump impeller head maintenance device, including two bases 1, a lifting cylinder 3 connected to the top of the base 1, a first lifting sprocket 4 installed on the top of the base 1, and a side frame 5 installed on the top of the base 1. The lifting cylinder, the first lifting sprocket and the side frame on the two bases are symmetrically arranged. The top of the side frame 5 is provided with a groove, the inner wall of the groove is provided with a second lifting sprocket 6, the inner wall of the side frame 5 is slidably connected with a U-shaped lifting slider 7, the opposite sides of the two lifting sliders 7 are respectively provided with clamping systems 2, the two sides of the two side frames 5 are connected with two fixed steel beams 9, the outer surfaces of the two lifting sliders 7 are connected with lifting connecting steel beams 8, the two clamping systems 2 are used to place the impeller head 11, and the bottom of the base 1 is provided with a drive wheel 10; The clamp system 2 includes a U-shaped support shell 21, and the two ends of the lifting slider 7 are symmetrically arranged L-shaped support blocks. The support shell 21 is movably mounted on a pair of L-shaped support blocks. The inner wall of the support shell 21 is provided with a sliding groove 22, and the inner wall of the sliding groove 22 is connected to two limiting plates 23 and a baffle 24. An arc plate 25 is slidably connected between one side of the two limiting plates 23. Two support plates 26 are connected to one side of the arc plate 25. An arc block 27 is connected to one side of the support plate 26. One side of the arc block 27 is connected to the outer surface of the arc plate 25. Two limiting telescopic rods 28 are connected to one side of the arc-shaped block 27. One end of the limiting telescopic rod 28 is connected to the inner wall of the slide groove 22. A damping telescopic rod 29 is connected to one side of the arc-shaped block 27. One end of the damping telescopic rod 29 is connected to the inner wall of the slide groove 22. A spring 210 is provided on the outer surface of the damping telescopic rod 29. One end of the spring 210 is connected to one side of the arc-shaped block 27, and the other end of the spring 210 is connected to the inner wall of the slide groove 22. The outer surface of the support plate 26 is slidably connected to the inner wall of the slide groove 22, and the outer surface of the arc-shaped block 27 is slidably connected to the inner wall of the slide groove 22. The clamp system 2 also includes a hydraulic rod 211, one side of which is connected to one side of the lifting slider 7, and the output end of the hydraulic rod 211 is connected to one side of the support shell 21.

[0019] The side frame 5 is provided with receiving grooves at its top and bottom, and the outer surface of the lifting slider 7 is provided with an embedded groove. Two fixed steel beams 9 are respectively installed in the receiving grooves at the top and bottom of the side frame 5. The lifting connecting steel beam 8 is used to embed into the groove of the lifting slider 7. A sliding plate 12 is provided between the two fixed steel beams 9. The lifting connecting steel beam 8 is located between two fixed steel beams 9 and is slidably connected to the sliding plate 12.

[0020] The lifting connecting steel beam is connected between two fixed steel beams by a sliding plate to form a whole. In this way, during installation, the fixed steel beam is placed directly in the receiving groove, and the lifting connecting steel beam is embedded in the groove, which makes it easy to connect the components on the two bases to form a whole. This design makes it suitable for scenarios with limited space, facilitates transportation, allows for on-site assembly, and improves adaptability.

[0021] The fixed steel beam moves up and down along the slide plate, improving the reliability of the guide.

[0022] Through the above embodiments, the precise lifting of the impeller head and main shaft can be achieved by cooperating with the lifting cylinder 3, the first lifting sprocket 4, the second lifting sprocket 6 and the lifting slider 7, ensuring the safety and stability of the equipment during the lifting process, avoiding damage to the equipment caused by impact or improper human operation, and achieving the effect of safe and stable lifting.

[0023] By using the design of lifting connecting steel beam 8, combined with the low-speed, synchronous lifting capability of the hydraulic control circuit, smooth operation is ensured during maintenance, the probability of failure is reduced, and an efficient and reliable lifting effect is achieved.

[0024] The connection design between the chain and the lifting cylinder 3 directly converts the movement of the lifting cylinder 3 into the movement of the lifting slider, improving the operating accuracy. Combined with other accessories, it can effectively avoid operational instability caused by mechanical errors, achieving the effect of precise lifting operations.

[0025] The application of hydraulic rod 211 enables the clamping and loosening of clamping system 2, which can respond quickly during maintenance. This not only improves maintenance efficiency, but also avoids deformation or damage to impeller head 11 due to improper clamping during the clamping process, achieving a safe and fast clamping effect.

[0026] The design of the drive wheel 10 provides a steerable self-propelled mechanism, making the device more flexible in movement and unrestricted by site conditions. It is particularly suitable for use in complex environments, achieving excellent mobility and allowing operators to flexibly adjust the device's position in different environments. The drive wheel moves the maintenance device to the pump pit to operate the impeller head.

[0027] Through the design of the clamping system 2, especially the linkage design between the arc plate 25, the support shell 21 and the arc block 27, the displacement and shaking of the impeller head 11 during the clamping process can be effectively prevented, ensuring the accuracy of the maintenance and the stability of the impeller head 11 during the maintenance process, thus achieving the effect of enhancing stability. The application of the spring 210 provides additional elastic potential energy, further enhancing the fixing force on the impeller head 11, significantly enhancing the clamping effect. It is particularly suitable for maintenance tasks that require high fixing strength, ensuring the stability of the device during long-term maintenance, and achieving the effect of strengthening the fixing of the impeller head 11.

[0028] The hydraulic system design enables high-efficiency energy conversion without the need for an additional power supply. It can still operate normally even when power is insufficient, enhancing the adaptability of the device and achieving energy self-sufficiency. Through the rational design and material selection of each component, the device can maintain excellent working performance under high loads and long-term use, extending the service life of the equipment and achieving a durable effect.

[0029] In specific operation, the lifting cylinder 3, the first lifting sprocket 4, the second lifting sprocket 6, and the lifting slider 7 are required to slowly lift the impeller head and main shaft at a controllable speed. Once the lifting position is reached, the clamping system 2 locks them in place to prevent the impeller head and main shaft from sliding or descending. Two independent hydraulic lifting mechanisms are used, connected together by a lifting connecting steel beam 8. The lifting process is achieved at low speed and synchronously through a hydraulic control circuit. The lifting distance can be ensured by selecting cylinders with different strokes according to specific needs. The lifting cylinder 3 is connected to a chain, which passes through the first lifting sprocket 4 and the second lifting sprocket 6. The other end of the chain is connected to the lifting slider 7. The movement of the lifting cylinder 3 drives the lifting slider to rise and fall, thereby achieving the lifting and lowering of the impeller head. The clamping and loosening of the clamping system 2 is achieved by the hydraulic rod 211. The support shell 21 is placed on the lifting slider 7, and the horizontally placed hydraulic rod 211 provides power to achieve left and right movement, thus completing the clamping and loosening of the clamp. During the clamping process, the arc plate 25 first contacts the impeller head 11. During the clamping process of the support shell 21, the support shell 21 will gradually move towards the impeller head 11, while the arc plate 25 is blocked by the impeller head 11 and stops moving. This, in turn, links the support plate 26 and the arc block 27 to stop moving. The movement of the support shell 21 will drive the spring 210 to compress. The elastic potential energy provided by the spring 210 will tighten the impeller head 11 through the arc plate 25. The support shell 21 gradually moves to contact the impeller head 11, thereby fixing the impeller head 11.

[0030] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A large vertical axial flow pump impeller head maintenance device, comprising two bases (1), characterized in that: The top of each of the two bases (1) is provided with a lifting cylinder (3), a first lifting sprocket (4) and a side frame (5) from the outside to the inside. The top of the side frame (5) is provided with a groove, and the inner wall of the groove is provided with a second lifting sprocket (6). The inner wall of the side frame (5) is slidably connected with a U-shaped lifting slider (7). The lifting cylinder (3) is connected to the chain, and the chain is connected to the lifting slider (7) through the first lifting sprocket (4) and the second lifting sprocket (6). The two lifting sliders (7) are respectively provided with clamping systems (2) on opposite sides. Two fixed steel beams (9) are connected to both sides of the two side frames (5). A lifting connecting steel beam (8) is connected between the outer surfaces of the two lifting sliders (7). An impeller head (11) is placed between the two clamping systems (2). A drive wheel (10) is provided at the bottom of the base (1).

2. The large vertical axial flow pump impeller head maintenance device according to claim 1, characterized in that: The clamp system (2) includes a U-shaped support shell (21). The lifting slider (7) has L-shaped support blocks arranged symmetrically at both ends, and the support shell (21) is movably mounted on a pair of L-shaped support blocks; The inner wall of the support shell (21) is provided with a sliding groove (22), the inner wall of the sliding groove (22) is connected to two limiting plates (23), and the inner wall of the sliding groove (22) is connected to a baffle (24).

3. The large vertical axial flow pump impeller head maintenance device according to claim 2, characterized in that: An arc plate (25) is slidably connected between one side of the two limiting plates (23). Two support plates (26) are connected to one side of the arc plate (25). An arc block (27) is connected to one side of the support plate (26). One side of the arc block (27) is connected to the outer surface of the arc plate (25).

4. The large vertical axial flow pump impeller head maintenance device according to claim 3, characterized in that: Two limiting telescopic rods (28) are connected to one side of the arc-shaped block (27). One end of the limiting telescopic rod (28) is connected to the inner wall of the slide groove (22). A damping telescopic rod (29) is connected to one side of the arc-shaped block (27). One end of the damping telescopic rod (29) is connected to the inner wall of the slide groove (22).

5. A large vertical axial flow pump impeller head maintenance device according to claim 4, characterized in that: The outer surface of the damping telescopic rod (29) is provided with a spring (210), one end of the spring (210) is connected to one side of the arc block (27), and the other end of the spring (210) is connected to the inner wall of the slide groove (22).

6. A large vertical axial flow pump impeller head maintenance device according to claim 4, characterized in that: The outer surface of the support plate (26) is slidably connected to the inner wall of the slide groove (22), and the outer surface of the arc block (27) is slidably connected to the inner wall of the slide groove (22).

7. A large vertical axial flow pump impeller head maintenance device according to claim 2, characterized in that: The clamp system (2) also includes a hydraulic rod (211), one side of which is connected to one side of the lifting slider (7), and the output end of which is connected to one side of the support shell (21).

8. A large vertical axial flow pump impeller head maintenance device according to claim 1, characterized in that: The top and bottom of the side frame (5) are respectively provided with receiving grooves, and the outer surface of the lifting slider (7) is provided with a groove. Two fixed steel beams (9) are respectively installed in the receiving grooves at the top and bottom of the side frame (5). The lifting connecting steel beam (8) is used to embed into the groove of the lifting slider (7). A sliding plate (12) is provided between the two fixed steel beams (9). The lifting connecting steel beam (8) is located between two fixed steel beams (9) and is slidably connected to the sliding plate (12).

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