A vertical shaft flow pump impeller shell dismounting tool

Abstract

The utility model relates to a technical field of dismounting tool, concretely relates to a vertical shaft flow pump impeller shell dismounting tool, including universal sling and annular hanger, the top of annular hanger is provided with universal sling, the outside of annular hanger is provided with annular fixing frame, and the support plate is connected between annular hanger and annular fixing frame, and the through hole is reserved to support plate, universal sling is connected through iron chain and hook, the front projection of through hole is circular, and the through hole can accommodate iron chain to pass through, the utility model effectively solves the problem that crane hoisting point and shell butt joint are difficult to accurately align, and specially designed special support structure is used to cope with the problem that shell is easy to produce deformation due to self weight, simultaneously, the traditional mode of single hoisting point bearing is discarded, the flexible adjustment of stress point is realized, and the annular limiting scheme is additionally added.

Description

Technical Field

[0001] This utility model relates to the field of disassembly and assembly tools, specifically to a disassembly and assembly tool for a vertical axial flow pump impeller housing. Background Technology

[0002] In the disassembly and assembly of large vertical axial flow pumps, traditional methods mainly rely on cranes and manual assistance. However, due to the limited space of the pump room and the layout of the top lifting points, there are significant technical defects: First, it is difficult to accurately align the crane lifting points with the outer casing, and the casing is prone to tilting due to posture deviation, which may lead to collision with the pump shaft or seals. Statistics show that the damage rate of the outer casing is relatively high. Second, there is a lack of dedicated support structure during disassembly and assembly, and the outer casing is prone to deformation due to its own weight (especially hollow structures), which directly affects the sealing performance during subsequent installation.

[0003] Existing general-purpose lifting tools (such as hoists) cannot simultaneously meet the three core requirements of "precise positioning" and "prevention of self-weight deformation" because they are not designed with structures adapted to the structural characteristics of the impeller shell. Traditional lifting tools bear the load through a single lifting point, which can easily lead to load concentration and excessive local compressive stress or tilting. At the same time, they lack circumferential limiting functions and cannot suppress the swing and deformation of the shell during the lifting process. Furthermore, it is difficult to flexibly adjust the force-bearing point according to the flange hole or reinforcing rib position of different models, resulting in poor versatility.

[0004] Therefore, it is necessary to invent a tool for disassembling and assembling the impeller housing of a vertical axial flow pump to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a tool for disassembling and assembling the impeller housing of a vertical axial flow pump. This solution effectively solves the problem of difficulty in accurately aligning the crane lifting point with the housing. It addresses the problem of the housing easily deforming due to its own weight by specially designing a dedicated support structure. At the same time, it abandons the traditional method of bearing force at a single lifting point, realizes flexible adjustment of the force point, and adds an additional circumferential limiting scheme.

[0006] To achieve the above objectives, this utility model provides the following technical solution: it includes a universal lifting ring and a ring-shaped bracket. The universal lifting ring is provided at the top of the ring-shaped bracket, and a ring-shaped fixing bracket is provided on the outside of the ring-shaped bracket. The ring-shaped bracket and the ring-shaped fixing bracket are connected by a support plate, and the support plate has a through hole. The universal lifting ring is connected to a hook by an iron chain. The front projection of the through hole is circular, and the through hole can accommodate the iron chain to pass through.

[0007] Preferably, the upper surface of the annular fixing frame is recessed to form a fixing groove.

[0008] Preferably, the outer surface of the hook is provided with a polyurethane or aluminum bronze anti-wear lining.

[0009] This utility model also provides a tool for disassembling and assembling the impeller housing of a vertical axial flow pump, including a universal lifting ring and an annular hanger. An iron chain is set on the lower surface of the annular hanger, and an arc-shaped iron plate is set at the lower end of the iron chain. A hook is set at the bottom end of the arc-shaped iron plate, and hooks are arrayed on the outer surface of the arc-shaped plate.

[0010] Preferably, the arc-shaped iron sheet has the same curvature as the impeller housing of the vertical axial flow pump.

[0011] This utility model also provides a disassembly and assembly tool, including an upper clamping arm and a lower clamping arm. The top ends of the upper clamping arm and the lower clamping arm are hinged together. An L-shaped rod is provided on the outer side of the upper clamping arm. A through hole is provided through the upper clamping arm. The lower clamping arm is hinged to the bottom end of a telescopic rod. The top end of the telescopic rod is provided through the through hole. An accommodating space is provided between the upper clamping arm and the L-shaped rod.

[0012] Preferably, the top of the telescopic rod has a pre-drilled external thread, and the cutting device can be movably mounted on the top of the telescopic rod.

[0013] Preferably, the bottom end of the flattening device is provided with an internal thread, and the flattening device and the top end of the telescopic rod can be connected in a mating manner. The technical effects and advantages provided by this utility model in the above technical solution are as follows: A ring-shaped fixing frame is installed on the outer side of the ring-shaped hanger. The ring-shaped hanger and the ring-shaped fixing frame are rigidly connected by multiple support plates evenly distributed along the circumference, so that the two are concentrically arranged and form an integral frame. The ring-shaped fixing frame and the ring-shaped hanger are concentrically arranged and rigidly connected by multiple support plates, forming a "double-ring concentric" coplanar external embracing frame, which provides radial and circumferential passive support and restraint for the shell. The angular compensation of the universal lifting ring and the circumferential constraint of the ring-shaped hanger are superimposed, so that the shell can be quickly aligned with the axis through "small amplitude, step-by-step correction" during lifting. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0015] Figure 1 This is a perspective view of Embodiment 1 of the present utility model; Figure 2 This is a perspective view of Embodiment 2 of the present invention; Figure 3 This is a perspective view of Embodiment 3 of the present invention, excluding the cutting device and the flattening device; Figure 4 This is an exploded perspective view of Embodiment 3 of the present invention, including the cutting device; Figure 5 This is a perspective view of the cutting device according to Embodiment 3 of this utility model; Figure 6 This is a perspective view of the flattening device in Embodiment 3 of this utility model; Explanation of reference numerals in the attached figures: 100. Universal lifting ring; 200. Ring-shaped hanger; 300. Ring-shaped fixing frame; 400. Support plate; 500. Through hole; 600. Iron chain; 700. Hook; 800. Fixing groove; 900. Arc-shaped iron sheet; 901. Hanging rod; 1001. Upper clamping arm; 1002. Lower clamping arm; 1003. L-shaped rod; 1004. Through hole; 1005. Telescopic rod; 1006. Cutting device; 1007. Flattening device. Detailed Implementation

[0016] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0017] Example 1: This utility model provides the following... Figure 1 The illustrated tool for disassembling and assembling the impeller housing of a vertical axial flow pump includes a universal lifting ring 100 and an annular hanger 200. The universal lifting ring 100 is located at the top of the annular hanger 200. This top universal lifting ring 100 serves as a rotation "point," supporting the chain of the lifting equipment and providing multi-directional rotational freedom around the vertical and horizontal axes, enabling fine-tuning of the posture during lifting. This eliminates the need for a single lifting point and allows for flexible adjustment of the load-bearing point, solving the problem of precise alignment when the crane's lifting point is connected to the housing.

[0018] The annular hanger 200 at the bottom of the universal joint 100 serves as a load-bearing "ring": the top of the annular hanger 200 is rigidly connected to the universal joint 100 to form a large-diameter load-bearing ring surface, which serves as the main load-bearing and guiding component of the outer shell.

[0019] An annular fixing frame 300 is installed on the outer side of the annular hanger 200. The annular hanger 200 and the annular fixing frame 300 are rigidly connected by multiple support plates 400 evenly distributed along the circumference (specifically by welding), so that the two are arranged concentrically and form an integral frame. The annular fixing frame 300 and the annular hanger 200 are arranged concentrically and rigidly connected by multiple support plates 400 to form a "double-ring concentric" coplanar external frame, which provides radial and circumferential passive support and limitation for the shell. That is, a circumferential limitation scheme is added. The rotation angle compensation of the universal lifting ring 100 and the circumferential constraint of the annular hanger 200 are superimposed, so that the shell can be quickly aligned with the axis through "small amplitude, step-by-step correction" during lifting, avoiding scratching with the pump shaft and seals.

[0020] The "double ring" frame transforms the load that was originally concentrated at the suspension point into a load that is evenly distributed along the ring surface, significantly reducing local compressive stress and the risk of shell tilting, and structurally suppressing the self-weight ellipticization and sagging deformation of the hollow thin-walled shell.

[0021] The annular hanger 200 and the annular fixed frame 300 are connected by a support plate 400, which has a pre-drilled through hole 500. The universal lifting ring 100 is connected to the hook 700 via a chain 600. The pre-drilled through hole 500 on the support plate 400 is used to thread the chain 600 through multiple points evenly according to the flange holes or reinforcing ribs of the outer shell, thus completing the distribution and transmission of force. That is, the front projection of the through hole is circular, and the through hole can accommodate the chain to pass through. The through hole 500 on the support plate 400 facilitates flexible threading of chains / belts according to the flange holes or reinforcing ribs of the outer shell, adapting to different models. The annular structure avoids damage to the paint / body caused by local clamping, reducing the risk of personnel being injured by falling objects. The support plate 400 is both a load-bearing component and an assembly carrier. The through hole 500 on it serves as a "force flow channel" and an "assembly interface".

[0022] Functionality: A chain 600 is inserted through the through hole 500, which can be arranged in multiple points, at equal intervals and symmetrically according to the flange holes or reinforcing ribs of the shell, thereby achieving balanced force distribution and positioning correction at multiple points, ensuring that the shell maintains a stable posture and coaxiality during lifting and positioning.

[0023] The 100 universal lifting ring provides multi-directional rotation and azimuth adjustment to absorb sway during lifting; the 600 chain bears the main pulling force and enables fine adjustment of length and angle; the 700 hook enables quick engagement and disengagement with the lifting points on the outer shell, facilitating safe and efficient operation in confined spaces.

[0024] The above scheme works collaboratively in the following ways: the top is flexibly aligned by the universal lifting ring 100; the middle is evenly distributed and circumferentially stable by the annular hanger 200; the bottom is supported and limited by the annular fixing frame 300; and the middle is further equipped with force distribution and multi-point correction by the support plate 400 and the through hole 500.

[0025] The upper surface of the annular fixing frame 300 is recessed to form a fixing groove 800, which allows the iron chain 600 to pass through, thereby improving the "geometric constraint" of the housing's positioning: the fixing groove 800 on the upper surface of the annular fixing frame 300 restricts the radial displacement and angular rotation of the housing during disassembly and assembly, avoiding the repeated "alignment-deviation-realignment" of the housing during fine adjustment.

[0026] Reduced collision risk: The fixed groove 800 provides a "stop when in position" mechanical limit, reducing close contact and scratches between the housing and pump shaft and seals caused by operator fine-tuning by feel.

[0027] Sharing the load at the lifting point and protecting the sealing surface: When the outer shell is lifted, the fixing groove 800 bears part of its own weight and inertial force, making it easier for the sealing surface area to remain in a "free suspension" state, avoiding scratches on the sealing surface caused by shaking or accidental contact.

[0028] The outer surface of the hook 700 is provided with a polyurethane or aluminum bronze anti-wear liner. The low coefficient of friction and high wear resistance of the polyurethane or aluminum bronze anti-wear liner reduce scratches, indentations and metal transfer when in contact with the outer shell lifting point or ear plate.

[0029] Improved operational safety: Polyurethane or aluminum bronze are low-hardness, non-brittle materials, so even if there is a slight impact, they are not likely to produce metal fragments or sharp burrs, reducing the probability of secondary damage to the sealing surface and coating.

[0030] Polyurethane or aluminum bronze lining can absorb micro-vibrations and impacts, reducing metal collision noise; at the same time, it reduces the tendency of the chain and hook to bite together, making it easier to hook and unhook quickly.

[0031] To improve corrosion resistance and lifespan: Polyurethane or aluminum bronze lining materials are well adapted to the water vapor or mildly corrosive environments commonly found in pumping stations, extending tool maintenance cycles and service life.

[0032] Example 2: Figure 2 As shown, the difference between this embodiment and Embodiment 1 is that this embodiment provides a tool for disassembling and assembling the impeller housing of a vertical axial flow pump, including a universal lifting ring 100 and an annular hanger 200. An iron chain 600 is set on the lower surface of the annular hanger 200, an arc-shaped iron plate 900 is set at the lower end of the iron chain 600, a hook 700 is set at the bottom end of the arc-shaped iron plate 900, and hanging rods 901 are arranged vertically in an array on the outer surface of the arc-shaped iron plate 900. The iron chain 600 and the arc-shaped iron plate 900 + hook 700 are directly set on the lower surface of the annular hanger 200. The chain links in the iron chain 600 are hung on the hanging rods 901, which can realize the adjustable distance between the hook 700 and the annular hanger 200. That is, a "multi-point support" is first formed at the lower edge of the housing, and then the upper lifting point is slowly lifted, which significantly reduces the sagging and deformation caused by the weight of the housing.

[0033] The 900mm arc-shaped iron sheet fits snugly against the lower edge of the outer shell, dispersing local pressure and preventing point load crushing or "pinching"; the lifting and hoisting are carried out simultaneously, reducing the time window for the outer shell to "lose stability and swing" in the air.

[0034] Precise alignment and posture maintenance: The lower support point and upper lifting point form a "multi-point positioning" system. Combined with the fine-tuning of the universal lifting ring 100, the outer shell axis quickly aligns with the pump cavity axis, facilitating safe clearance control with the pump shaft and seals. Hooks 700 are arrayed on the outer surface of the arc-shaped patch. The combination of hooks 700 and chains 600 facilitates quick attachment and detachment. The length of the chains 600, which work with the hooks 700, is adjustable to accommodate pump rooms of different heights and outer shell shapes. Even in confined pump room spaces, normal lifting operations can be achieved.

[0035] The lower end of the iron chain 600 is reliably connected to the upper end of the arc-shaped iron plate 900 via a shackle; the lower end of the arc-shaped iron plate 900 is equipped with a hook 700 for quick attachment to the preset lifting point on the lower edge of the outer shell.

[0036] The arc-shaped iron sheet 900 has the same curvature as the impeller housing of the vertical axial flow pump. The arc-shaped iron sheet 900 matches and fits the lower edge of the housing, providing surface contact support to solve the problem of the housing being prone to deformation due to its own weight, and also disperses pressure and protects the sealing surface; the hook 700 enables quick connection and disconnection.

[0037] The arc-shaped iron sheet 900 has the same curvature as the impeller housing of the vertical axial flow pump. This design also makes the lifting contact surface approximately a "small surface-to-surface" contact, resulting in a more uniform load distribution and avoiding indentations and deformations caused by local stress concentration.

[0038] Ensuring coaxiality and clearance: Curve matching helps the lower support point to be coaxial with the geometric center of the housing, reducing the housing's rotation and sway during lifting, and lowering the probability of interference with the pump shaft and seals.

[0039] Enhanced versatility and interchangeability: By replacing the 900 arc-shaped iron sheet with different curvatures, it can be quickly adapted to shells of different diameters in the same series, reducing the number of special tooling and improving on-site assembly efficiency and stability.

[0040] The other design schemes in this embodiment are the same as those in Embodiment 1.

[0041] Example 3: As Figure 3-6 As shown, the difference between this embodiment and embodiment 1 is that this embodiment provides a disassembly and assembly tool, including an upper clamping arm 1001 and a lower clamping arm 1002. The top ends of the upper clamping arm 1001 and the lower clamping arm 1002 are hinged together. An L-shaped rod 1003 is provided on the outer side of the upper clamping arm 1001. A through hole 1004 is provided through the upper clamping arm 1001. The lower clamping arm 1002 is hinged to the bottom end of a telescopic rod 1005. The top end of the telescopic rod 1005 is provided through the through hole 1004.

[0042] Upper clamping arm 1001: As the upper load-bearing and force-transmitting component of the tool, an accommodating space is provided between the upper clamping arm 1001 and the L-shaped rod 1003. The L-shaped rod 1003 is provided at the top to restrict the chain links in the existing chain and to bear the longitudinal positioning of the chain links. A through hole 1004 is opened in the middle, which provides a passage for the telescopic rod 1005 to pass through and slide, so that the lifting and posture adjustment of the lower clamping arm 1002 are controlled by the geometric constraints of the upper clamping arm 1001, and the chain links are structurally suppressed from lateral tilting and forward and backward movement.

[0043] Lower clamping arm 1002: used to provide stable clamping at two or four points; the bottom end is connected to the telescopic rod 1005 by a hinge, so that the lower clamping arm 1002 can achieve micro-pitching or opening and closing adaptively with the extension and retraction of the telescopic rod 1005.

[0044] Hinged joint (i.e., the connection between the top of the upper clamping arm 1001 and the top of the lower clamping arm 1002): forms a rotating joint, allowing the lower clamping arm 1002 to adapt its attitude under load changes and spatial interference conditions, avoiding local stress concentration and local indentation / deformation of the shell caused by rigid connection.

[0045] The telescopic rod 1005 (passing through the through hole 500 of the upper clamping arm 1001) serves as a guide rod to constrain the lifting trajectory of the lower clamping arm 1002. The lower clamping arm 1002 is hinged at the end of the telescopic rod 1005: while providing guidance and support, the telescopic rod 1005 retains angular freedom, allowing the tool to be compatible with chain links of different diameters (approximately 1.2–3 m) and curvatures, reducing the number of special clamps and shortening on-site changeover time.

[0046] Through hole 500 (through setting of upper clamping arm 1001): It is both a geometric constraint hole (limiting the sway of telescopic rod 1005) and a clearance hole (reducing the height of the whole machine). By selecting the diameter of through hole 1004 and the clearance fit of telescopic rod 1005, a balance can be achieved between "rigidity and flexibility", ensuring smooth lifting and not generating additional bending moment.

[0047] The telescopic rod 1005 has a pre-drilled external thread at its top, allowing the cutting device 1006 to be movably mounted on top of the rod. When chain or sling deformation requires reshaping, the cutting device 1006 can be quickly installed at the top of the telescopic rod 1005. Utilizing the axial positioning and radial adjustability of the telescopic rod 1005, localized reshaping of the hoisting chain / sling can be performed, preventing chain link movement and collisions. The "movable" design at the working end facilitates quick disassembly and replacement, improving accessibility and operational safety in confined spaces. If a chain link needs to be removed, it can be cut using the cutting device 1006.

[0048] The flattening device 1007 has an internal thread at its bottom end. The flattening device 1007 and the top of the telescopic rod 1005 can be connected. After the shaping is completed, the flattening device 1007 can be replaced. The "cutting-flattening" process can be switched quickly through the threaded connection. The threaded connection provides stable axial preload and repeatable positioning accuracy, which facilitates the shaping and reshaping of deformed parts with small displacement and controllable force, reducing secondary damage to the shell and the risk to the sealing surface.

[0049] The rest of the content of this embodiment is the same as that of embodiment 1.

[0050] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A tool for disassembling and assembling the impeller housing of a vertical axial flow pump, comprising a universal lifting ring and an annular lifting bracket, characterized in that, The top of the annular hanger is equipped with a universal lifting ring, and the outer side of the annular hanger is equipped with an annular fixing frame. The annular hanger and the annular fixing frame are connected by a support plate with a through hole. The universal lifting ring is connected to a hook by a chain. The front projection of the through hole is circular and the through hole can accommodate the chain to pass through.

2. The tool for disassembling and assembling the impeller housing of a vertical axial flow pump as described in claim 1, characterized in that, The upper surface of the annular fixing frame is recessed to form a fixing groove.

3. The tool for disassembling and assembling the impeller housing of a vertical axial flow pump as described in claim 1, characterized in that, The outer surface of the hook is provided with a polyurethane or aluminum bronze anti-wear lining.

4. A tool for disassembling and assembling the impeller housing of a vertical axial flow pump, comprising a universal lifting ring and a ring-shaped lifting bracket, characterized in that... The lower surface of the annular hanger is provided with an iron chain, the lower end of the iron chain is provided with an arc-shaped iron plate, the bottom end of the arc-shaped iron plate is provided with a hook, and the outer surface of the arc-shaped patch is provided with an array of hooks.

5. The tool for disassembling and assembling the impeller housing of a vertical axial flow pump as described in claim 4, characterized in that, The arc-shaped iron sheet has the same curvature as the impeller housing of the vertical axial flow pump.

6. A disassembly and assembly tool, comprising an upper clamping arm and a lower clamping arm, characterized in that, The top ends of the upper clamping arm and the lower clamping arm are hinged together. An L-shaped rod is provided on the outer side of the upper clamping arm. A through hole is provided through the upper clamping arm. The lower clamping arm is hinged to the bottom end of the telescopic rod. The top end of the telescopic rod is provided through the through hole. An accommodating space is provided between the upper clamping arm and the L-shaped rod.

7. The disassembly and assembly tool as described in claim 6, characterized in that, The top of the telescopic rod has a pre-drilled external thread, and the cutting device or flattening device can be movably installed at the top of the telescopic rod.

8. The disassembly and assembly tool as described in claim 7, characterized in that, The flattening device is provided with an internal thread at its bottom end, and the flattening device and the top of the telescopic rod can be connected together.

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