A limited space axial flow pump dismounting device

Abstract

The utility model relates to mechanical technical field, concretely relates to a kind of limited space axial flow pump dismounting device, including electric hammer and knock head, the knock head is concave, knock head includes side wall and top surface, the bottom end of side wall is fixedly connected with top surface, and pattern is set in top surface inner surface, side wall is big and small at bottom, and the inner surface of side wall is set with convex in array;Electric hammer is connected with top surface by conical cylinder, and electric hammer can drive knock head to move together;The front projection of top surface is circular.The utility model can solve the problem of poor adaptability of dismounting tool, also improve the impact energy of a single knock bolt, solve the problem that operator needs to continue to exert force, also improve the knock accuracy in limited space, and solve the problem of "cracking" or "slipping".

Description

Technical Field

[0001] This utility model relates to the field of mechanical technology, specifically to a device for disassembling an axial flow pump in a confined space. Background Technology

[0002] In water conservancy projects and municipal water supply system infrastructure, large axial flow pumps serve as core fluid transport equipment. Their installation and maintenance often involve the disassembly and assembly of high-strength bolts. These bolts typically bear enormous preload, and their installation locations are often in confined spaces such as pump rooms or pipe interlayers—spaces that are narrow (the operating channel diameter may be only a few tens of centimeters) and have limited incident angles, placing high demands on the precision and adaptability of the disassembly and assembly tools.

[0003] Traditional operations mainly rely on manual hammering, but this method has significant drawbacks: First, the operating efficiency is extremely low: the impact energy of a single hammer blow on a bolt is low, while high-strength bolts require 50-100 blows to loosen a single bolt. The daily output can only complete the disassembly and assembly of 8-10 bolts, seriously affecting the maintenance cycle. Second, the safety is poor: the operating angle is limited in the confined space (such as oblique or lateral hammering), and manual hammer swing is prone to deviating from the center of the bolt, causing the impact force to concentrate in a local area of ​​the bolt head, resulting in "cracking" or "slipping" problems. At the same time, the tool is prone to slipping and injuring the surrounding pump or operators, posing a risk of personal injury. The work efficiency is also low.

[0004] To address the aforementioned issues, the industry has attempted to replace manual sledgehammers with general-purpose electric hammers. However, existing general-purpose electric hammers are primarily designed for rough concrete breaking operations, and their core drawback lies in the lack of a bolt-fitting structure: the electric hammer's output energy is fixed, and it does not have a dedicated contact component designed for bolt heads, making direct striking prone to damage to bolt heads or energy loss.

[0005] Therefore, it is necessary to invent a confined space axial flow pump disassembly device to solve the above problems. Utility Model Content

[0006] The purpose of this utility model is to provide a confined space axial flow pump disassembly device, which solves the problems of poor disassembly and assembly tools and poor adaptability, increases the impact energy of a single bolt strike, solves the problem of operators needing to exert continuous force, improves the accuracy of striking in confined spaces, and solves the problems of "cracking" or "slipping".

[0007] To achieve the above objectives, this utility model provides the following technical solution: It includes an electric hammer and a striking head, characterized in that the striking head is concave, comprising a side wall and a top surface, the bottom end of the side wall being fixedly connected to the top surface, the inner surface of the top surface being patterned, the side wall having a large opening and a small bottom, and the inner surface of the side wall being arrayed with protrusions; the electric hammer is connected to the top surface via a conical cylinder, and the electric hammer can drive the striking head to move together; the front projection of the top surface is circular.

[0008] Preferably, the pattern on the top surface is circular.

[0009] Preferably, a tapered cylinder is provided on the outer surface of the top surface, and a shoulder plate is provided between the tapered cylinder and the side wall.

[0010] Preferably, the shoulder piece is circumferentially shaped.

[0011] Preferably, the conical cylinder and the sidewall are interference-fitted.

[0012] This utility model also provides a confined space axial flow pump disassembly device, including an electric hammer and a striking rod. The geometric center of the striking rod is fixedly connected to the output end of the electric hammer, and striking devices are provided at both ends of the striking rod.

[0013] Preferably, a permanent magnet device is detachably mounted on the upper surface of the striking device.

[0014] Preferably, the upper surface of the striking device is connected to the permanent magnet device by bolts, and a through hole is reserved in the middle of the striking device.

[0015] The technical effects and advantages provided by this utility model in the above technical solution are as follows: The array of protrusions on the inner surface of the sidewall acts as a "biting-gripping" mechanism, suppressing slippage and rotation under high-frequency impact and improving energy coupling efficiency. The striking head consists of a sidewall and a top surface. The bottom end of the sidewall is fixed to the top surface, and the inner surface of the top surface is patterned. The sidewall has a large opening and a small bottom. This concave design, with its "large opening and small bottom," together with the pattern on the inner surface of the top surface, creates a self-centering effect. Even under oblique or lateral incident angles in confined spaces, the impact force can be concentrated more on the bolt centerline, reducing the risk of tool slippage and secondary damage to the pump body. Attached Figure Description

[0016] 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.

[0017] Figure 1 This is a perspective view of Embodiment 1 of the present utility model; Figure 2This is a schematic diagram of the striking head and conical cylinder in Embodiment 1 of this utility model; Figure 3 This is a side sectional view of the striking head and conical cylinder of Embodiment 1 of this utility model; Figure 4 This is a perspective view of Embodiment 2 of the present invention; Figure 5 This is an exploded view of the striking rod and permanent magnet device in Embodiment 2 of this utility model; Explanation of reference numerals in the attached figures: 100. Electric hammer; 200. Striking head; 201. Side wall; 202. Top surface; 300. Protrusion; 400. Conical cylinder; 500. Shoulder plate; 700. Striking rod; 800. Striking device; 900. Permanent magnet device; 901. Through hole. Detailed Implementation

[0018] 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.

[0019] Example 1: This utility model provides the following... Figure 1-3 The device shown is a confined space axial flow pump disassembly device, including an electric hammer 100 and a striking head 200. The striking head 200 is concave, optimizing force and energy transmission: the striking head 200 adopts a "concave shape + array of protrusions 300 on the inner surface of the sidewall 201" design, converting the axial impact of the electric hammer 100 into surface contact compressive stress and circumferential shear on the bolt head, significantly increasing the effective contact area and friction grip, so that the impact force is concentrated along the axis to the bolt head, reducing eccentricity and energy loss, and preventing the bolt head from being "cracked" or "slipped". The array of protrusions 300 on the inner surface of the sidewall 201 plays a "biting-gripping" role, suppressing slippage and rotation under high-frequency impact and improving energy coupling efficiency.

[0020] The striking head 200 includes a side wall 201 and a top surface 202. The bottom end of the side wall 201 is fixedly connected to the top surface 202. The inner surface of the top surface 202 is patterned. The side wall 201 has a large opening and a small bottom. The concave design of "large opening and small bottom" together with the pattern on the inner surface of the top surface 202 forms a self-centering effect. Even under oblique and lateral incident angles in a confined space, the impact force can be more concentrated on the bolt centerline, reducing the risk of tool slippage and secondary damage to the pump body.

[0021] The inner surface of the side wall 201 is arrayed with protrusions 300; the protrusions 300 on the top surface 202 and the inner surface of the side wall 201 can significantly improve the resistance to abrasive wear and pitting corrosion, extend the life of the hammer head 200, reduce the frequency of replacement, and adapt to the working conditions of high hardness nuts.

[0022] The electric hammer 100 is connected to the top surface 202 via the conical cylinder 400. This series connection of the electric hammer 100, conical cylinder 400, and top surface 202 rigidly and coaxially links the power source and the actuator, increasing the impact energy of striking a single bolt and solving the problem of continuous force application by the operator (i.e., replacing manual labor with electric power), ensuring a linear force flow. The electric hammer 100 can also drive the striking head 200 to move together. In an oblique incident posture, the concave geometry of the striking head 200 and the conical guide work together to suppress tool slippage and lateral sway, reducing the risk of injury to the pump body and personnel. This improves striking accuracy within a confined space, while reducing repeated alignment time and increasing the effective work density per dwell time, thus improving work efficiency.

[0023] The pattern on the top surface 202 is circumferential, and the front projection of the top surface 202 is circular. The front projection area of ​​the top surface 202 is larger than the cross-sectional area of ​​the bolt. The pattern on the top surface 202 is concentric with the inner edge of the concave shape, forming a uniform contact stress field in the circumferential direction, which improves the centering and suppresses the spin eccentricity of the striking head 200. It is particularly suitable for oblique incident conditions in confined spaces.

[0024] A conical cylinder 400 is provided on the outer surface of the top surface 202, and a shoulder plate 500 is provided between the conical cylinder 400 and the side wall 201. The outer conical cylinder 400 can act as a "guide sleeve" to first fit or approach the target surface during the strike, limiting the lateral swing of the striking head 200 and constraining the path of flying debris. The shoulder plate 500 provides axial positioning and force-bearing steps, so that the striking head 200 can still stably reproduce coaxial impact in strong vibration and dusty environments.

[0025] The shoulder plate 500 is circumferential in shape. The circumferential shoulder plate 500 is easy to cooperate with the tool front end chuck, which improves the repeatability and reliability of the assembly.

[0026] The tapered cylinder 400 and the side wall 201 are interference-fitted. The interference fit enables boltless quick assembly and resists impact loosening, while retaining the necessary axial floating tolerance. It absorbs assembly errors within the confined space and avoids damage to tools or workpieces caused by "hard collision". Example 2: As Figure 4-5As shown, the difference between this embodiment and Embodiment 1 is that this embodiment provides a confined space axial flow pump disassembly device, including an electric hammer 100 and a striking rod 700. The geometric center of the striking rod 700 is fixedly connected to the output end of the electric hammer 100, and striking devices 800 are provided at both ends of the striking rod 700. Bidirectional operation and confined space adaptation: The geometric center of the striking rod 700 is fixedly connected to the output end of the electric hammer 100, and striking devices 800 are provided at both ends, allowing for the parallel loosening and unloading of two bolts, significantly improving efficiency: In a confined space, two bolts can be loosened or reset by striking in one placement, changing the traditional "multiple alignments—single bolt operation" work cycle to "one placement—two bolts simultaneously," significantly shortening the single dwell time and total working time, saving manual operation time, and improving work efficiency.

[0027] Synchronous loosening suppresses uneven stress and jamming: Simultaneous impact from both sides helps the flange surface to rebound evenly and the threaded pair to unload evenly, reducing the risk of uneven loading, jamming, and seizing caused by loosening on one side first, and is especially friendly to rust / sticky connections.

[0028] "Geometric center-output end fixed connection" is the key constraint for force output, ensuring the symmetry and repeatability of the tapping at both ends, avoiding energy loss and damage to the target part caused by assembly eccentricity, and ensuring stable posture and controllable force flow: the simultaneous action of both ends can offset part of the recoil torque, reduce the "hand-pinching" of the tool in a narrow space, improve the grip stability and tapping point consistency, and avoid bolt head damage caused by eccentric tapping.

[0029] The upper surface of the striking device 800 is detachably equipped with a permanent magnet device 900, which can magnetically hold the steel nut, enabling quick positioning, preventing loosening and falling; it can also be quickly removed when needed, improving reliability and avoiding adsorption damage to stainless steel or coated surfaces.

[0030] The upper surface of the striking device 800 is connected to the permanent magnet device 900 by bolts, which facilitates on-site disassembly, replacement and maintenance; the reserved through hole 901 in the middle of the permanent magnet device 900 can be used as a working channel for bolts to pass through, which can increase the number of permanent magnet devices 900. By stacking the number of permanent magnet devices 900, the magnetism can be increased, that is, the bolt connection realizes the modular setting.

[0031] When the permanent magnet device 900 encounters a bolt, it automatically approaches the bolt and completes the hammering operation.

[0032] The other design schemes in this embodiment are the same as those in Embodiment 1.

[0033] 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 confined space axial flow pump dismantling device, comprising an electric hammer and a striking head, characterized in that, The striking head is concave and includes a side wall and a top surface. The bottom end of the side wall is fixed to the top surface. The inner surface of the top surface is patterned. The side wall has a large opening and a small bottom. The inner surface of the side wall is arrayed with protrusions. The electric hammer is connected to the top surface through a conical cylinder. The electric hammer can drive the striking head to move together. The front projection of the top surface is circular.

2. The confined space axial flow pump disassembly device as described in claim 1, characterized in that, The pattern on the top surface is circular.

3. The confined space axial flow pump disassembly device as described in claim 2, characterized in that, A conical cylinder is provided on the outer surface of the top surface, and a shoulder plate is provided between the conical cylinder and the side wall.

4. The confined space axial flow pump disassembly device as described in claim 3, characterized in that, The shoulder piece is circumferential in shape.

5. The confined space axial flow pump disassembly device as described in claim 3, characterized in that, The conical cylinder and sidewall are interference-fitted.

6. A confined space axial flow pump dismantling device, comprising an electric hammer and a striking rod, characterized in that, The geometric center of the striking rod is fixedly connected to the output end of the electric hammer, and striking devices are provided at both ends of the striking rod.

7. The confined space axial flow pump disassembly device as described in claim 6, characterized in that, A permanent magnet can be detachably installed on the upper surface of the striking device.

8. The confined space axial flow pump disassembly device as described in claim 7, characterized in that, The upper surface of the striking device is connected to the permanent magnet device by bolts, and a through hole is reserved in the middle of the striking device.

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