Impeller hoisting tool and hoisting method

Abstract

The invention provides an impeller hoisting tool and a hoisting method, which are used for mounting an impeller on a slurry pump and comprise a hoisting tool, a pitching mechanism and a rotary structure. The lifting appliance is connected with the impeller and comprises a lifting hook which extends into a liquid inlet of the impeller. And the pitching structure is fixedly connected with the lifting appliance and drives the lifting appliance to deflect around the horizontal axis. And the rotary structure comprises a shell, a rotary gear, a lead screw and a ball nut, and drives the lifting appliance to rotate around the vertical axis. The lead screw is rotatably supported on the shell; the ball nut and the lead screw form a ball screw pair, the ball nut is provided with a first rack part meshed with the rotary gear, and the rotary gear is fixedly connected with the pitching structure and the lifting appliance; when the lead screw is controlled to rotate, the ball nut is driven to move in the axial direction of the lead screw, and through meshing transmission of the first rack part and the rotation gear, the rotation gear, the pitching structure connected with the rotation gear and the lifting appliance are driven to rotate together. According to the hoisting tool, the impeller can be adjusted in a pitching and rotating mode, and the installation accuracy is ensured.

Description

Technical Field

[0001] This application relates to the field of slurry pump technology, and more specifically, to an impeller hoisting tool and hoisting method. Background Technology

[0002] In the manufacturing and maintenance of slurry pumps, the hoisting and installation of the impeller is a fundamental and crucial operational step. Currently, the industry generally faces a lack of specialization in hoisting equipment.

[0003] The lack of specialized hoisting tools significantly reduces production efficiency. The transfer, positioning, and assembly of the impeller with the pump shaft typically require manual adjustments and multiple attempts by operators. This process is time-consuming and labor-intensive, severely restricting production rhythm and hindering overall efficiency improvement. Existing simple hoisting methods pose significant safety hazards. If the impeller is not reliably secured or improperly positioned during hoisting, it is highly susceptible to accidental detachment or sudden movement. This can not only damage the product itself but also pose a serious threat to the personal safety of on-site operators, increasing the risk of workplace injuries. Over-reliance on manual operation also increases operating costs. Heavy manual labor not only demands high physical fitness from workers but also increases skill requirements and training costs. Furthermore, continuous high-intensity labor can easily lead to worker fatigue, affecting work enthusiasm and the stability of work quality. Summary of the Invention

[0004] This application provides an impeller hoisting tool and hoisting method, which can adjust the impeller by pitching and rotating to ensure the accuracy of installation.

[0005] Specifically, this application is implemented through the following technical solution: One aspect of this application provides an impeller lifting tool for installing an impeller onto a slurry pump, comprising: A lifting device for connecting to the impeller, the lifting device including a hook for extending into the liquid inlet of the impeller; The pitch structure is fixedly connected to the lifting device and is used to drive the lifting device to deflect around the horizontal axis in order to adjust the pitch attitude of the impeller. The rotating structure includes a housing, a rotating gear, a lead screw, and a ball nut, used to drive the lifting device to rotate about a vertical axis; The lead screw is rotatably supported on the housing; The ball nut and the lead screw form a ball screw pair. The ball nut is provided with a first rack portion that meshes with the rotary gear. The rotary gear is fixedly connected to the pitching structure and the lifting device. When the lead screw is rotated in a controlled manner, it drives the ball nut to move along its axial direction. Through the meshing transmission between the first rack and the rotary gear, the rotary gear and the pitching structure and the lifting device connected thereto rotate together.

[0006] Optionally, the rotary structure further includes a meshing block, which is disposed opposite to the ball nut on both sides of the rotary gear and has a second rack portion that meshes with the rotary gear; The housing is provided with a partition, which divides the interior of the housing into a first chamber and a second chamber. The rotary gear is rotatably mounted at the center of the partition; The lead screw and the ball nut are housed in the first chamber, and the ball nut moves along the length of the first chamber; The engagement block is housed within the second chamber and is movable along its length.

[0007] Optionally, in the second chamber, elastic reset members are respectively provided on both sides of the meshing block; When the engagement block is in the middle of its travel stroke, the elastic reset members on both sides are in a natural state of neither compression nor stretching.

[0008] Optionally, within the first chamber, the ball nut is supported by a rolling support structure against the inner wall of the first chamber.

[0009] Optionally, the pitch structure includes: a fixed support, a pitch plate, and a pitch drive mechanism; The pitch plate is rotatably connected to one end of the fixed support via a hinge shaft; The pitch drive mechanism is installed at the other end of the fixed support column, and its output end is connected to the pitch plate frame, for driving the pitch plate to deflect around the axis of the hinge shaft; The lifting device is fixedly installed on the pitch plate.

[0010] Optionally, the lifting device includes a lifting device body, which is provided along its length as: a first fixing part, an adjusting elongated hole, and the lifting hook; The first fixing part is fitted into the slot of the pitch plate; The adjusting elongated hole extends along the length of the lifting device body, and a locking rod passes through the adjusting elongated hole; The pitch plate is provided with a T-shaped limiting groove corresponding to the adjusting elongated hole. One end of the locking rod is accommodated in the T-shaped limiting groove and can slide along it, while the other end is used to insert into the locking hole of the impeller and lock it.

[0011] Optionally, two lifting devices are symmetrically installed on the pitch plate. The two hooks of the two lifting devices are respectively used to extend into the liquid inlet of the impeller and abut against the radially opposite sides of the inner wall of the liquid inlet of the impeller.

[0012] Optionally, a wiring groove is provided on the side of the fixed support facing away from the pitch plate.

[0013] Another aspect of this application provides a hoisting method for installing an impeller onto the pump shaft of the slurry pump, using the impeller hoisting tool described in any of the preceding claims, the method comprising: Connect and lock the lifting device to the impeller; The impeller is hoisted to the target installation location; The horizontal rotation angle of the impeller is adjusted by the aforementioned rotary structure; The pitch attitude of the impeller is adjusted by the pitch structure; Align the impeller with the pump shaft and complete the installation.

[0014] This application provides an impeller lifting tool and method for installing an impeller onto a slurry pump, including a lifting device, a pitching mechanism, and a rotating structure. The lifting device, through a hook and another connecting component, forms a clamping and fixing state, reliably securing the impeller to the lifting tool. The lifting device is a standardized design, which ensures consistency and repeatability in the lifting operation of different impellers, facilitating unified management and quality control in large-scale production processes. The method involves first inserting the hook into the impeller's inlet, and then securing and locking the impeller to the other connecting component.

[0015] The pitching structure can be implemented using a hinged support and a drive motor, enabling micro-angle pitch adjustment of the impeller. Since the pump shaft installed on-site may not be perfectly perpendicular to the ground, pitch adjustment can compensate for such installation deviations, ensuring accurate alignment between the impeller end face and the pump shaft end face. The slewing structure solves the problem of initial angle deviation that may occur when the impeller is lifted by a crane. When there is a large angular error or even a complete reversal between the impeller orientation and the installation position, the slewing structure allows direct adjustment of the impeller's horizontal angle, avoiding the operational difficulties and large space requirements of readjusting the crane position.

[0016] The rotary structure drives the ball nut to move linearly via the rotation of a lead screw, and the first rack on the nut then drives the rotary gear to rotate, achieving precise motion conversion. The ball screw pair composed of a lead screw and a ball nut has the advantages of high transmission accuracy, low frictional resistance, and good self-locking performance, ensuring both accurate control of the rotation angle and reliable locking of the mechanism at any position. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the front of a hoisting tool shown in an exemplary embodiment of this application; Figure 2 This is a schematic diagram of the back of a lifting tool shown in an exemplary embodiment of this application; Figure 3 This is a top view of a lifting tool illustrated in an exemplary embodiment of this application; Figure 4 This is an internal schematic diagram of the rotating structure shown in an exemplary embodiment of this application; Figure 5 This is a partial schematic diagram of a rotating structure shown in an exemplary embodiment of this application; Figure 6 This is a side view of a lifting tool illustrated in an exemplary embodiment of this application; Figure 7 This is an enlarged view of a pitch drive mechanism shown in an exemplary embodiment of this application; Figure 8 This is an enlarged view of the hinge shaft shown in an exemplary embodiment of this application; Figure 9 This is an enlarged view of the adjustment elongated hole shown in an exemplary embodiment of this application.

[0018] Wherein: A, impeller; 100, lifting device; 110, hook; 120, adjusting elongated hole; 130, first fixing part; 140, locking rod; 200, pitch structure; 210, fixed support column; 211, wiring trough; 220, pitch plate; 221, hinge shaft; 222, T-shaped limiting groove; 230, pitch drive mechanism; 300, rotary structure; 310, housing; 311, first chamber; 312, second chamber; 313, partition; 320, rotary gear; 330, lead screw; 340, ball nut; 341, first rack part; 350, meshing block; 351, second rack part; 352, elastic reset element. Detailed Implementation

[0019] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0020] If the embodiments of this application contain terms relating to directional indications or positional relationships (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movement of the components in a specific posture (as shown in the attached figures); if the specific posture changes, the directional indications or positional relationships will also change accordingly. Furthermore, the terms "first" and "second" used in the embodiments of this application are only for descriptive convenience and should not be construed as indicating or implying relative importance.

[0021] refer to Figure 1 , Figure 2 and Figure 3 This application provides an impeller lifting tool for installing an impeller A onto a slurry pump, including a lifting device 100, a pitching mechanism, and a rotating structure 300. The lifting device 100 is used to connect to the impeller A and includes a hook 110 for extending into the liquid inlet of the impeller A. Figure 7 The pitch structure 200, fixedly connected to the lifting device 100, is used to drive the lifting device 100 to deflect around the horizontal axis, thereby adjusting the pitch attitude of the impeller A. Combined with... Figure 4 and Figure 5 The rotating structure 300 includes a housing 310, a rotating gear 320, a lead screw 330, and a ball nut 340, used to drive the lifting device 100 to rotate around a vertical axis. The lead screw 330 is rotatably supported on the housing 310; the ball nut 340 and the lead screw 330 form a ball screw pair, and the ball nut 340 is provided with a first rack portion 341 that meshes with the rotating gear 320. The rotating gear 320 is fixedly connected to the pitch structure 200 and the lifting device 100. When the lead screw 330 is rotated in a controlled manner, it drives the ball nut 340 to move along its axial direction. Through the meshing transmission between the first rack portion 341 and the rotating gear 320, the rotating gear 320 and the connected pitch structure 200 and the lifting device 100 are driven to rotate together. The axis of the rotating gear 320 in the rotating structure 300 is perpendicular to the ground, while the axis of rotation of the pitch structure 200 is parallel to the ground.

[0022] The lifting device 100, together with the hook 110 and another connecting component, forms a clamping and fixing state, reliably securing the impeller A to the lifting tool. The lifting device 100 is a standardized design, ensuring consistency and repeatability in the lifting operations of different impellers A, facilitating unified management and quality control in large-scale production. The process involves first inserting the hook 110 into the inlet of the impeller A, then fixing and locking the impeller A via the other connecting component. The pitch structure 200 can be implemented using a hinged support and a drive motor, enabling micro-angle pitch adjustment of the impeller A. Since the pump shaft installed on-site may not be perfectly perpendicular to the ground, pitch adjustment can compensate for such installation deviations, ensuring accurate alignment between the impeller A end face and the pump shaft end face. The slewing structure 300 solves the problem of initial angle deviation that may occur when lifting the impeller A by crane. When there is a large angular error or even a complete reversal between the impeller A's orientation and the installation position, the slewing structure 300 can directly adjust the horizontal angle of the impeller A, avoiding the operational difficulties and large space requirements of readjusting the crane position. The rotary structure 300 drives the ball nut 340 to move linearly via the rotation of the lead screw 330. The first rack portion 341 on the ball nut 340 then drives the rotary gear 320 to rotate, achieving precise motion conversion. The ball screw pair composed of the lead screw 330 and the ball nut 340 has the advantages of high transmission accuracy, low frictional resistance, and good self-locking performance, ensuring both accurate control of the rotation angle and reliable locking of the mechanism at any position.

[0023] Combination Figure 4 and Figure 5 In one embodiment, the rotary structure 300 further includes a meshing block 350, which is disposed opposite to the ball nut 340 on both sides of the rotary gear 320 and has a second rack portion 351 that meshes with the rotary gear 320; a partition 313 is provided inside the housing 310, which divides the interior of the housing 310 into a first chamber 311 and a second chamber 312; the rotary gear 320 is rotatably mounted at the center of the partition 313; the lead screw 330 and the ball nut 340 are housed in the first chamber 311, and the ball nut 340 moves along the length of the first chamber 311; the meshing block 350 is housed in the second chamber 312 and can move along its length.

[0024] By arranging the meshing block 350 and the ball nut 340 opposite each other on both sides of the rotary gear 320, a symmetrical transmission structure is formed, ensuring that the rotary gear 320 is subjected to balanced forces during transmission, effectively improving the smoothness of transmission and reducing gear wear. The first chamber 311 and the second chamber 312 provide independent moving tracks for the ball nut 340 and the meshing block 350. The inner walls of the chambers provide precise guidance and movement limits for these two components, effectively preventing them from deviating during movement. This ensures that the first rack portion 341 and the second rack portion 351 maintain a stable meshing state with the rotary gear 320, avoiding transmission failure caused by disengagement. The rotary gear 320 is mounted at the center of the partition 313, allowing its teeth to fully mesh with the first rack section 341 and the second rack section 351 respectively. The forward or reverse rotation of the lead screw 330 drives the ball nut 340 to move left or right, which in turn drives the rotary gear 320 to achieve continuous clockwise or counterclockwise rotational motion via the rack section. The lead screw 330 is rotatably supported on the wall of the first chamber 311 via bearings. This support method ensures the concentricity of the lead screw 330's rotation, reduces friction and vibration during transmission, makes the movement of the ball nut 340 smoother, and further improves the motion accuracy and reliability of the entire rotary structure 300.

[0025] In one embodiment, elastic reset members 352 are respectively provided on both sides of the meshing block 350 in the second chamber 312. When the meshing block 350 is in the middle position of its travel stroke, the elastic reset members 352 on both sides are in a natural state of neither compression nor stretching. The restoring force generated by the elastic reset members 352 on both sides of the meshing block 350 after compression directly acts on the meshing block 350. This restoring force is transmitted to the rotary gear 320 through the second rack portion 351 on the meshing block 350 and is decomposed into radial and tangential components. Among them, the key radial component presses the second rack portion 351 tightly against the tooth surface of the rotary gear 320. This force, through the rotary gear 320 as a medium, produces the same effect at the meshing point on the other side, pressing the gear tooth surface tightly against the first rack portion 341 on the ball nut 340. This automatically and continuously eliminates the bidirectional meshing backlash in the entire gear transmission pair, effectively overcoming the backlash error and impact vibration caused by backlash during start-up, stopping, and reversing, significantly improving the accuracy and smoothness of rotary motion. Simultaneously, the accompanying tangential component force, as a small additional load on the system, is designed to be much smaller than the driving force of the lead screw 330, thus not hindering the normal drive of the ball nut 340 and the rotary motion of the mechanism, maintaining drive effectiveness while ensuring high-precision transmission.

[0026] In one embodiment, within the first chamber 311, the ball nut 340 is connected to the inner wall of the first chamber 311 via a rolling support structure. Specifically, the rolling support structure can be a roller mounted on the side of the ball nut 340, allowing it to make rolling contact with the inner wall of the first chamber 311. This design transforms the sliding friction between the ball nut 340 and the inner wall of the chamber during movement into rolling friction, significantly reducing motion resistance and wear. This directly reduces the torque required to drive the lead screw 330, making transmission lighter and more efficient. It also effectively prevents motion disruption caused by excessive frictional resistance or jamming, ensuring that the ball nut 340 can move smoothly and precisely along the axis of the lead screw 330. This not only improves the controllability and precision of rotary motion control but also extends the service life of the ball nut 340 and the chamber structure by reducing wear, enhancing the reliability of the entire rotary structure 300.

[0027] Combination Figure 6 , Figure 7 and Figure 8 In one embodiment, the pitch structure 200 includes a fixed support column 210, a pitch plate 220, and a pitch drive mechanism 230. The pitch plate 220 is rotatably connected to one end of the fixed support column 210 via a hinge shaft 221; the pitch drive mechanism 230 is mounted on the other end of the fixed support column 210, and its output end is connected to the pitch plate 220 frame, used to drive the pitch plate 220 to deflect around the axis of the hinge shaft 221; the lifting device 100 is fixedly mounted on the pitch plate 220. The pitch drive mechanism 230 can use linear drive elements such as cylinders, hydraulic push rods, or electric push rods, and its output thrust acts directly on the pitch plate 220, providing a stable and reliable power source for adjusting the pitch attitude of impeller A. The top of the fixed support column 210 is fixedly connected to the rotary gear 320 of the rotary structure 300, so that the entire pitch structure 200 can rotate as a whole with the rotary gear 320. This realizes the composite attitude adjustment of impeller A in space. The pitch plate 220 serves as the main load-bearing and installation platform, providing a stable support plane for the lifting device 100. By setting multiple weight-reducing holes on the pitch plate 220, the overall weight of the pitch plate 220 and the components it supports is significantly reduced while effectively ensuring structural strength. This not only reduces the load requirements on the slewing and pitching drive mechanism 230 and improves the response speed and energy efficiency of the mechanism, but also reserves space for necessary pipeline layout, making the overall structure more compact and reasonable.

[0028] Combination Figure 1 , Figure 6 and Figure 9In one embodiment, the lifting device 100 includes a main body, which has a first fixing part 130, an adjusting elongated hole 120, and a hook 110 along its length. The first fixing part 130 is fitted into a slot in the pitch plate 220. The adjusting elongated hole 120 extends along the length of the main body and a locking rod 140 passes through it. A T-shaped limiting groove 222 is provided on the pitch plate 220 corresponding to the adjusting elongated hole 120. One end of the locking rod 140 is accommodated in the T-shaped limiting groove 222 and can slide along it, while the other end is used to insert into the locking hole of the impeller A and lock it. The fitting of the first fixing part 130 with the slot of the pitch plate 220 provides a stable and reliable installation reference for the lifting device 100. The hook 110 extends into the liquid inlet of the impeller A to form the first bearing point, while the locking rod 140 forms the second bearing point by inserting into the locking hole located at the radial edge of the impeller A. The key feature is that the locking rod 140 can slide and lock along the adjusting elongated hole 120 and the corresponding T-shaped limiting groove 222. This allows the distance between the two load-bearing points to be flexibly and precisely adjusted according to the actual specifications of the impeller A. After the position is determined and locked, the hook 110 and the locking rod 140 together form a stable clamping and fixing of the impeller A from both radial sides. This design effectively expands the versatility of the lifting tool, enabling it to safely and reliably adapt to and clamp various sizes and specifications of impeller A, significantly improving the application range and operational flexibility of the equipment.

[0029] In one embodiment, two lifting devices 100 are symmetrically mounted on the pitch plate 220. The two hooks 110 of each lifting device 100 are respectively used to extend into the liquid inlet of impeller A and abut against the radially opposite sides of the inner wall of the liquid inlet of impeller A. The symmetrical clamping formed by the two lifting devices 100 on the radial sides of the liquid inlet of impeller A significantly improves the balance and stability of impeller A during lifting, effectively preventing deflection and swaying of impeller A. To accommodate different sizes of impeller A liquid inlets, one of the lifting devices 100 is designed to be detachably mounted on the pitch plate 220. By disassembling and adjusting the mounting position of this lifting device 100 on the pitch plate 220, the radial distance between the two hooks 110 can be changed, allowing it to precisely match the inner wall spacing of a specific impeller A liquid inlet.

[0030] refer to Figure 2In one embodiment, a wiring groove 211 is provided on the side of the fixed support 210 facing away from the pitch plate 220. Providing a wiring groove 211 on the fixed support 210 directly removes material from some non-load-bearing areas, achieving weight reduction of the component itself and helping to reduce the moment of inertia of the entire lifting tool. Furthermore, this wiring groove 211 provides space for laying cables powering the motor of the pitch drive mechanism 230, control signal lines, and possible hydraulic lines. The cables and lines can be orderly fixed within the groove, effectively preventing them from hooking, interfering with, or being squeezed and worn by external equipment during complex movements of the mechanism, especially during pitch and rotation. This greatly improves the reliability and safety of the system, while also making the overall structure look cleaner and facilitating daily inspection and maintenance.

[0031] This application also provides a method for hoisting an impeller A of a slurry pump, for installing the impeller A onto the pump shaft of the slurry pump, using any of the impeller hoisting tools described above. The method includes: connecting and locking the hoisting tool 100 to the impeller A; hoisting the impeller A to the target installation position; adjusting the horizontal rotation angle of the impeller A through the slewing structure 300; adjusting the pitch attitude of the impeller A through the pitch structure 200; aligning the impeller A with the pump shaft and completing the installation.

[0032] The specific process can be as follows: First, install the lifting tool 100 on the pitch plate 220, so that the hook 110 on the lifting tool 100 extends into the liquid inlet of the impeller A. Then, insert the locking rod 140 into the locking hole on the impeller A and lock it in place, so that the hook 110 and the locking rod 140 clamp and fix the impeller A from both radial sides. Move the lifting tool and the fixed impeller A to a predetermined position in front of the pump shaft of the slurry pump using a crane. Control the drive of the rotary structure 300 to make the impeller A rotate around the vertical axis, and adjust its keyway or mounting hole to the corresponding position facing the pump shaft. Operate the pitch drive mechanism 230 to fine-tune the angle of the impeller A around the horizontal axis so that its end face is parallel to the end face of the pump shaft. While maintaining the correct posture, the crane slowly moves the lifting tool to accurately fit the impeller A into the pump shaft, completing the final installation.

[0033] This operational procedure enabled the hoisting of impeller A. First, the coordinated clamping of hook 110 and locking rod 140 ensured the stability and safety of impeller A during hoisting. During positioning, the adjustment process was broken down into two independent adjustments: first rotation, then pitch. This step-by-step operation logic is clear and effectively reduces the complexity of simultaneous multi-degree-of-freedom adjustments, allowing operators to achieve more precise and faster alignment. This not only significantly improves installation efficiency but also effectively reduces the risk of equipment damage due to improper human operation, while reducing the need for operating space, making it particularly suitable for applications in space-constrained industrial settings.

[0034] It should be noted that the technical solutions or features described in the above embodiments can be combined or complemented by each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A tool for lifting impellers, characterized in that, For mounting the impeller (A) to the slurry pump, including: A lifting device (100) for connecting to the impeller (A), the lifting device (100) including a hook (110) for extending into the liquid inlet of the impeller (A); The pitch structure (200) is fixedly connected to the lifting device (100) and is used to drive the lifting device (100) to deflect around the horizontal axis to adjust the pitch attitude of the impeller (A); The rotating structure (300) includes a housing (310), a rotating gear (320), a lead screw (330), and a ball nut (340) for driving the lifting device (100) to rotate about a vertical axis; The lead screw (330) is rotatably supported on the housing (310). The ball nut (340) and the lead screw (330) form a ball screw pair. The ball nut (340) is provided with a first rack portion that meshes with the rotary gear (320). The rotary gear (320) is fixedly connected to the pitch structure (200) and the lifting device (100). When the lead screw (330) is rotated in a controlled manner, it drives the ball nut (340) to move along its axial direction. Through the meshing transmission between the first rack and the rotary gear (320), the rotary gear (320) and the pitching structure (200) and the lifting device (100) connected thereto are driven to rotate together.

2. The impeller lifting tool as described in claim 1, characterized in that, The rotary structure (300) further includes a meshing block (350), which is disposed opposite to the ball nut (340) on both sides of the rotary gear (320) and has a second rack portion that meshes with the rotary gear (320); The housing (310) is provided with a partition (313), which divides the interior of the housing (310) into a first chamber (311) and a second chamber (312). The rotary gear (320) is rotatably mounted at the center of the partition (313); The lead screw (330) and the ball nut (340) are housed in the first chamber (311), and the ball nut (340) moves along the length of the first chamber (311); The engagement block (350) is housed in the second chamber (312) and is movable along its length.

3. The impeller lifting tool as described in claim 2, characterized in that, In the second chamber (312), elastic reset members (352) are respectively provided on both sides of the engagement block (350). When the engagement block (350) is in the middle of its travel, the elastic reset members (352) on both sides are in a natural state of neither compression nor stretching.

4. The impeller lifting tool as described in claim 2, characterized in that, Within the first chamber (311), the ball nut (340) is attached to the inner wall of the first chamber (311) via a rolling support structure.

5. The impeller lifting tool as described in any one of claims 1 to 4, characterized in that, The pitch structure (200) includes: a fixed support (210), a pitch plate (220), and a pitch drive mechanism (230); The pitch plate (220) is rotatably connected to one end of the fixed support (210) via a hinge shaft (221); The pitch drive mechanism (230) is installed at the other end of the fixed support (210), and its output end is connected to the pitch plate (220) frame to drive the pitch plate (220) to deflect around the axis of the hinge shaft (221). The lifting device (100) is fixedly installed on the pitch plate (220).

6. The impeller lifting tool as described in claim 5, characterized in that, The lifting device (100) includes a lifting device (100) body, which is provided along its length as: a first fixing part (130), an adjusting elongated hole (120) and the hook (110). The first fixing part (130) is fitted into the slot of the pitch plate (220); The adjusting elongated hole (120) extends along the length of the main body of the lifting device (100), and a locking rod (140) passes through the adjusting elongated hole (120). The pitch plate (220) is provided with a T-shaped limiting groove (222) corresponding to the adjusting elongated hole (120). One end of the locking rod (140) is accommodated in the T-shaped limiting groove (222) and can slide along it, while the other end is used to insert into the locking hole of the impeller (A) and lock it.

7. The impeller lifting tool as described in claim 6, characterized in that, Two lifting devices (100) are symmetrically installed on the pitch plate (220). The two hooks (110) of the two lifting devices (100) are respectively used to extend into the liquid inlet of the impeller (A) and abut against the radially opposite sides of the inner wall of the liquid inlet of the impeller (A).

8. The impeller lifting tool as described in claim 5, characterized in that, The fixed support (210) has a wiring groove (211) on the side facing away from the pitch plate (220).

9. A hoisting method for installing an impeller (A) onto the pump shaft of the slurry pump, using an impeller hoisting tool as described in any one of claims 1 to 8, characterized in that, The hoisting method includes: Connect and lock the lifting device (100) to the impeller (A); The impeller (A) is hoisted to the target installation position; The horizontal rotation angle of the impeller (A) is adjusted by the rotary structure (300); The pitch attitude of the impeller (A) is adjusted by the pitch structure (200); Align the impeller (A) with the pump shaft and complete the installation.

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