A slurry pump cover hoisting tool

Abstract

This utility model relates to the field of slurry pump maintenance technology and discloses a slurry pump cover hoisting tool, including a vertical, U-shaped lower hoisting frame and a horizontal C-shaped connecting frame. The open end of the hoisting frame faces downward, and the open end of the hoisting frame and the open end of the connecting frame are hinged. The connecting frame is provided with a connecting flange for connecting to the suction pipe flange of the pump cover. Lifting lugs for attaching to the hoisting tool are fixedly connected to the hoisting frame. The opening width of both the hoisting frame and the connecting frame is greater than the width of the pump cover. After the connecting flange is connected to the suction pipe flange, the hinge axis of the hoisting frame and the connecting frame passes through the center of gravity of the pump cover in the horizontal direction. During the process of leveling the pump cover, the pump cover never needs to contact the ground, thus preventing collisions with surrounding facilities and scratches to the ground. Furthermore, there is no need to operate a crane for horizontal movement or release the wire rope, so the pump cover is less prone to shaking when leveled.

Description

Technical Field

[0001] This utility model relates to the field of slurry pump maintenance technology, and in particular to a slurry pump cover hoisting tool. Background Technology

[0002] Slurry pumps are common equipment in steel enterprises, used to transport mixtures of impurities (such as oxide scale removed during steelmaking) and water, which are abrasive. AH and ZJ series slurry pumps are widely used in steel enterprises due to their long service life, ease of disassembly and assembly, and low maintenance and operating costs. Both series are double-casing pumps, consisting of an inner casing and an outer casing, with the impeller located inside the inner casing. The inner casing is cast from wear-resistant materials (such as wear-resistant white cast iron), while the outer casing consists of a pump body and a pump cover, with the inner casing sandwiched within the cavity formed between the pump body and the pump cover. Since the inner casing is in contact with the mixture being pumped, while the outer casing only provides support for the inner casing and does not come into contact with the mixture, after a period of operation, if the inner casing becomes worn and unable to meet production process requirements, the pump cover can be removed from the pump body, and only the worn inner casing and impeller need to be replaced. Therefore, steel enterprises maintain a certain reserve of inner casings and impellers as wear parts for timely replacement.

[0003] The typical method for disassembling a pump cover involves using an overhead crane, suspended from the lifting hole on the top of the cover by a steel cable. The connecting bolts between the pump body and the cover are then loosened, and the cover is lifted away. Afterward, the cover needs to be laid flat (due to its height and rounded bottom, it cannot stand upright), detached from the steel cable, and the worn inner casing is lifted out and replaced using the overhead crane. The flattened cover is then lifted back up and erected before being reattached to the pump body. Pump covers are very heavy, weighing anywhere from several hundred kilograms to one or two tons, or even more.

[0004] like Figure 7 As shown, when lowering the pump cover 12, the bottom of the pump cover 12 needs to be in contact with the ground first. Then, the overhead crane is moved. While the overhead crane is moving, the pump cover 12 is slowly lowered by releasing the steel wire rope 17 of the overhead crane until the pump cover 12 is flat on the ground.

[0005] This process is entirely manual, requiring simultaneous control of the crane's lateral movement speed and the release speed of the crane's wire rope 17. Therefore, during the lowering process, improper operation can lead to a mismatch between the crane's lateral movement speed and the wire rope 17's release speed, causing the bottom of the pump cover 12 to easily slide along the ground or sway and shake around its contact point with the ground. This can result in minor scratches to the ground and damage to the pump cover 12 or surrounding facilities, or even serious injury to the operator. This places high demands on the operator's skills and experience; even skilled crane operators are not immune to errors. Similarly, the same problem exists when lifting the leveled pump cover 12.

[0006] Patent CN117486063A discloses a special lifting fixture for pump covers, including a fixed sleeve, a pull rod that slides through the fixed sleeve, and three fixed claws evenly distributed and hinged on the outer circumference of the fixed sleeve. Each fixed claw has an outwardly protruding claw portion. A lifting eye nut is installed at the upper end of the pull rod, and a threaded section is provided at the lower end of the pull rod. A support core block is screwed onto the threaded section. The threaded section is used to adjust the axial position of the support core block on the pull rod. The outer circumferential wall of the support core block has at least one tapered section. This fixture can only lift horizontally placed pump covers and cannot achieve a stable 90° rotation of the pump cover, therefore it is not suitable for the disassembly and assembly of slurry pump covers. Utility Model Content

[0007] The technical problem to be solved by this utility model is to provide a slurry pump cover hoisting tool to solve the problem that the pump cover is prone to swaying and shaking when it is laid flat or lifted from a flat state due to the lack of coordination between the crane's translation speed and the wire rope's release and retraction speed.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0009] A slurry pump cover hoisting tool includes a vertical, U-shaped lower hoisting frame and a horizontal, C-shaped connecting frame. The open end of the hoisting frame faces downwards, and the open end of the hoisting frame and the open end of the connecting frame are hinged together. The connecting frame is provided with a connecting flange for connecting to the suction pipe flange of the pump cover. The hoisting frame is fixedly connected with a lifting lug for attaching to the hoisting tool. The opening width of both the hoisting frame and the connecting frame is greater than the width of the pump cover. After the connecting flange is connected to the suction pipe flange, the hinge axis of the hoisting frame and the connecting frame passes through the center of gravity of the pump cover in the horizontal direction.

[0010] Furthermore, the connecting frame includes a first crossbeam, a second crossbeam, and a first end plate that are fixedly connected to both sides of the connecting flange in sequence. The first crossbeam and the second crossbeam are both arranged in the horizontal direction and are perpendicular to each other. The first end plate is hinged to the lower end of the lifting frame.

[0011] Furthermore, the lower end of the lifting frame is fixedly connected to a second end plate. The first end plate is provided with a hinge hole, and the second end plate is provided with a through hole. The first end plate and the second end plate are hinged together by a pin that passes through the hinge hole and the through hole.

[0012] Furthermore, there are several hinge holes, and after the connecting flange is connected to the suction pipe flange, one of the hinge holes passes through the center of gravity of the pump cover.

[0013] Furthermore, the lifting frame includes a first lifting frame in the shape of a portal frame and a second lifting frame in the shape of a figure eight fixedly connected to the top of the first lifting frame. The connecting frame is hinged to the lower end of the first lifting frame, and the lifting lug is fixedly connected to the top of the second lifting frame. The center of gravity of the pump cover passes through the lifting lug in the vertical direction.

[0014] Furthermore, a connecting block is provided between the first crossbeam and the connecting flange. The connecting flange and the first crossbeam are respectively fixedly connected to both sides of the connecting block. Three stiffening plates are fixedly connected between the connecting block and the first crossbeam. The three stiffening plates are located on the upper side, the lower side, and the side away from the pump cover of the first crossbeam.

[0015] Furthermore, the two bottom ends of the second lifting frame are fixedly connected to the two ends of the top of the first lifting frame, and a vertical tie rod is fixedly connected to the top of the second lifting frame and the middle position of the top of the first lifting frame.

[0016] The positive effects of this utility model are:

[0017] In this invention, the hinge axis of the lifting frame and connecting frame passes horizontally through the center of gravity of the pump cover. Therefore, when the pump cover rotates, it only needs to overcome the frictional force at the hinge joint of the lifting frame and connecting frame, making the pump cover easy to turn. During the process of leveling the pump cover, it never needs to contact the ground, thus preventing collisions with surrounding facilities and scratches to the ground. Furthermore, there is no need to operate a crane for translation or release the wire rope, making the pump cover less prone to wobbling when leveled. Attached Figure Description

[0018] Figure 1 This is the front view of this utility model;

[0019] Figure 2 yes Figure 1 The left view;

[0020] Figure 3 This is a side view of the connecting frame;

[0021] Figure 4 Left view of this utility model in use;

[0022] Figure 5 yes Figure 4 The left view;

[0023] Figure 6 This is a schematic diagram showing the pump cover after it has been lifted off the pump body and laid flat.

[0024] Figure 7 This is a diagram showing the pump cover when it is laid down.

[0025] In the picture:

[0026] 1. Connecting flange; 2. Connecting block; 3. First crossbeam; 4. Second crossbeam; 5. First end plate; 6. Second end plate; 7. First lifting frame; 8. Second lifting frame; 9. Lifting lug; 10. Connecting hole; 11. Hinge hole; 12. Pump cover; 13. Pump body; 14. Suction pipe flange; 15. Connecting frame; 16. Lifting frame; 17. Wire rope. Detailed Implementation

[0027] Example 1

[0028] like Figure 1 and Figure 2 As shown, a slurry pump cover hoisting tool includes a vertical, U-shaped lifting frame 16 and a horizontal, C-shaped connecting frame 15. The open end of the lifting frame 16 faces downwards and is located at its bottom. The open end of the lifting frame 16 and the open end of the connecting frame 15 are hinged together. A circular connecting flange 1 is provided in the middle of the connecting frame 15. The connecting flange 1 is connected to the suction pipe flange 14 of the pump cover 12 by bolts and nuts. A lifting lug 9 is fixedly connected to the middle position of the top of the lifting frame 16. The lifting lug 9 is connected to the overhead crane wire rope 17 by shackles. The opening width of both the lifting frame 16 and the connecting frame 15 is greater than the width of the pump cover 12. After the connecting flange 1 and the suction pipe flange 14 on the pump cover 12 are connected, the hinge axis of the lifting frame 16 and the connecting frame 15 passes through the center of gravity of the pump cover 12 in the horizontal direction.

[0029] Combination Figure 4 and Figure 5 As shown, the usage process of this utility model is as follows:

[0030] First, connect the connecting flange 1 to the suction pipe flange 14 using bolts and nuts. Install shackles on the lifting lug 9 and connect them to the overhead crane's wire rope 17. Remove the connecting bolts between the pump body 13 and the pump cover 12, remove the pump cover 12 from the pump body 13, and move it away from the pump body 13. Pull the bottom and top of the pump cover 12 to rotate it counterclockwise as shown. Figure 6 The pump is in the horizontal position shown. Operate the overhead crane to lower the pump cover 12.

[0031] Since the hinge axis of the lifting frame 16 and the connecting frame 15 passes through the center of gravity of the pump cover 12 in the horizontal direction, the pump cover 12 only needs to overcome the friction of the hinge part of the lifting frame 16 and the connecting frame 15 when rotating, so the pump cover 12 can be easily turned.

[0032] Therefore, during the process of leveling the pump cover 12, the pump cover 12 does not need to contact the ground, thus preventing collisions with surrounding facilities and scratches to the ground. Furthermore, there is no need to operate the overhead crane for horizontal movement or release the wire rope, making the pump cover 12 less prone to wobbling when leveled.

[0033] After the pump cover 12 is laid flat, simply operate the overhead crane to place the flattened pump cover 12 vertically onto the wooden blocks on the ground.

[0034] After installing the inner shell into the pump body 13, lift the pump cover 12, then turn the pump cover 12 to a vertical position, and then connect the pump cover 12 to the pump body 13.

[0035] Example 2

[0036] Combination Figure 3 As shown, the difference between this embodiment and Embodiment 1 is that:

[0037] The connecting frame 15 includes a connecting block 2, a first crossbeam 3, a second crossbeam 4, and a first end plate 5, which are sequentially welded to both sides of the connecting flange 1. The first crossbeam 3 and the second crossbeam 4 are both arranged in the horizontal direction and are perpendicular to each other in the horizontal plane. The first end plate 5 is hinged to the second end plate 6 welded to the lower end of the lifting frame 16.

[0038] The first end plate 5 is provided with a hinge hole 11, and the second end plate 6 is provided with a through hole. The first end plate 5 and the second end plate 6 are hinged together by a pin that passes through the hinge hole 11 and the through hole.

[0039] There are nine hinge holes 11, which are arranged in a 3x3 grid on the first end plate 5. After the connecting flange 1 is connected to the suction pipe flange 14, one of the hinge holes 11 passes through the center of gravity of the pump cover 12.

[0040] By setting nine hinge holes 11, the position of the hinge shaft of the lifting frame 16 and the connecting frame 15 can be easily adjusted so that the axis of the pin passes through the center of gravity of the pump cover 12.

[0041] The connecting flange 1 and the first crossbeam 3 are welded to both sides of the connecting block 2 respectively. Three stiffening plates are welded between the connecting block 2 and the first crossbeam 3. The three stiffening plates are located on the upper side, the lower side and the side away from the pump cover 12 of the first crossbeam 3, thereby increasing the connection strength and rigidity between the first crossbeam 3 and the connecting flange 1.

[0042] Example 3

[0043] The difference between this embodiment and Embodiment 2 is that:

[0044] The lifting frame 16 includes a first lifting frame 7 in the shape of a gate and a second lifting frame 8 in the shape of an eight-character fixedly connected to the top of the first lifting frame 7. The second end plate 6 is welded to the lower end of the first lifting frame 7. The lifting lug 9 is fixedly connected to the top of the second lifting frame 8. After the pump cover 12 is lifted, the center of gravity of the pump cover 12 passes vertically through the lifting lug 9.

[0045] The two bottom ends of the second lifting frame 8 are welded to the two ends of the top of the first lifting frame 7, and a vertical tie rod is fixedly connected to the top of the second lifting frame 8 and the middle position of the top of the first lifting frame 7.

[0046] In actual production, the first lifting frame 7, the second lifting frame 8, the first crossbeam 3 and the second crossbeam 4 can be made of channel steel, square tube or I-beam. The corresponding pump cover lifting tools are made according to the different specifications of slurry pumps.

[0047] The second lifting frame 8 forms a stable triangular support structure, thereby preventing the first lifting frame 7 from deforming under stress.

[0048] The above-described embodiments are detailed and specific, illustrating preferred embodiments of the present utility model. They are only used to illustrate the technical ideas and features of the present utility model, with the aim of enabling those skilled in the art to understand the content of the present utility model and implement it accordingly. However, they are not limited to the present utility model, and the patent scope of the present utility model cannot be limited by this embodiment alone. That is, any equivalent changes or modifications made to the spirit disclosed in the present utility model, without departing from the structure of the present utility model, such as local improvements within the system and modifications or transformations between subsystems, are still within the patent scope of the present utility model.

Claims

1. A slurry pump cover hoisting tool, characterized in that, The system includes a vertical, U-shaped lifting frame (16) and a horizontal, C-shaped connecting frame (15). The opening end of the lifting frame (16) faces downward. The opening end of the lifting frame (16) and the opening end of the connecting frame (15) are hinged together. The connecting frame (15) is provided with a connecting flange (1) for connecting to the suction pipe flange (14) of the pump cover (12). The lifting frame (16) is fixedly connected with a lifting lug (9) for attaching to a lifting tool. The opening width of the lifting frame (16) and the opening width of the connecting frame (15) are both greater than the width of the pump cover (12). When the connecting flange (1) is connected to the suction pipe flange (14), the hinge axis of the lifting frame (16) and the connecting frame (15) passes through the center of gravity of the pump cover (12) in the horizontal direction.

2. The slurry pump cover hoisting tool according to claim 1, characterized in that, The connecting frame (15) includes a first crossbeam (3), a second crossbeam (4) and a first end plate (5) that are fixedly connected to both sides of the connecting flange (1) in sequence. The first crossbeam (3) and the second crossbeam (4) are both arranged in the horizontal direction and are perpendicular to each other. The first end plate (5) is hinged to the lower end of the lifting frame (16).

3. The slurry pump cover hoisting tool according to claim 2, characterized in that, The lower end of the lifting frame (16) is fixedly connected to a second end plate (6). The first end plate (5) is provided with a hinge hole (11), and the second end plate (6) is provided with a through hole. The first end plate (5) and the second end plate (6) are hinged together by a pin that passes through the hinge hole (11) and the through hole.

4. The slurry pump cover hoisting tool according to claim 3, characterized in that, There are several hinge holes (11). After the connecting flange (1) is connected to the suction pipe flange (14), one of the hinge holes (11) passes through the center of gravity of the pump cover (12).

5. The slurry pump cover hoisting tool according to claim 1, characterized in that, The lifting frame (16) includes a first lifting frame (7) in the shape of a gate and a second lifting frame (8) in the shape of an eight-character fixedly connected to the top of the first lifting frame (7). The connecting frame (15) is hinged to the lower end of the first lifting frame (7). The lifting lug (9) is fixedly connected to the top of the second lifting frame (8). The center of gravity of the pump cover (12) passes through the lifting lug (9) vertically.

6. The slurry pump cover hoisting tool according to claim 2, characterized in that, A connecting block (2) is provided between the first crossbeam (3) and the connecting flange (1). The connecting flange (1) and the first crossbeam (3) are fixedly connected to both sides of the connecting block (2). Three stiffening plates are fixedly connected between the connecting block (2) and the first crossbeam (3). The three stiffening plates are located on the upper side, the lower side and the side away from the pump cover (12) of the first crossbeam (3).

7. The slurry pump cover hoisting tool according to claim 5, characterized in that, The two bottom ends of the second lifting frame (8) are fixedly connected to the two ends of the top of the first lifting frame (7), and a vertical tie rod is fixedly connected to the top of the second lifting frame (8) and the middle position of the top of the first lifting frame (7).

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