Nodular cast iron pipeline hoisting tool

Abstract

The utility model provides a nodular cast iron pipeline hoisting tool which comprises a hollow hoisting beam with a hoisting lug in the middle of the upper end, rope outlets formed in the left side wall and the right side wall of the hoisting beam, two winding drum assemblies rotationally arranged in the hoisting beam, and two groups of hoisting ropes which are wound on the two winding drum assemblies respectively and are opposite in winding direction, the driving mechanism is arranged on the lifting beam, can drive the two winding drum assemblies to rotate at the same time and is opposite in rotating direction, the movable ends of the two sets of lifting ropes penetrate through the rope outlets in the two sides to be connected with a lifting clamp, and a fastener is arranged on the lifting clamp; the extending distances of the lifting ropes at the two ends can be kept consistent all the time, then it is ensured that a lifting point roughly coincides with the gravity center of the pipeline, the stability of the pipeline in the lifting process is improved, the lifting clamp and the fastening piece can ensure that the pipeline is evenly stressed in the lifting process, pipeline inclination caused by shaking of the lifting hook is avoided, the structure is simple, operation is convenient, and practicability is high. The flexibility is high, and the hoisting efficiency can be effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of ductile iron pipe construction, and particularly relates to a lifting tool for ductile iron pipes. Background Technique

[0002] Ductile iron pipes refer to pipes that are cast by high-speed centrifugal casting in a centrifugal ductile iron casting machine after adding a spheroidizing agent to molten iron with a casting number of 18 or above. They are simply referred to as spherical pipes, ductile iron pipes, and ductile iron cast pipes, etc. They have the advantages of good toughness, wear resistance, and corrosion resistance, high strength, and long service life. They are mainly used in the fields of water supply, gas transmission, and oil transmission in municipal and industrial and mining enterprises.

[0003] When transporting or installing ductile iron pipes, it is necessary to lift the ductile iron pipes. Currently, ductile iron pipes are usually lifted using hooks or nylon slings. When using nylon slings for lifting, it is necessary for workers to wind the nylon slings around the pipes manually, then connect the nylon slings to hooks or rings, and finally lift them using a crane or hoist; when using hooks with protective coatings or wrappings to lift ductile iron pipes, it is necessary to hook the two ends of the ductile iron pipe with the hooks respectively, and connect the hooks to the crane or hoist through lifting ropes to drive the ductile iron pipe to move.

[0004] However, there are still some drawbacks in the actual application of the above methods. When using nylon slings for lifting, when lifting and placing the pipes, it is necessary to first raise the foundation of the pipes to facilitate the installation or removal of the nylon slings. The operation is troublesome and requires multiple people to work simultaneously. The lifting efficiency is low, and if the position of the nylon sling is inaccurate, it may cause uneven stress on the pipes, leading to the risk of tilting or even slipping; during the lifting process using hooks, due to the free swaying of the pipes and lifting ropes, relative movement occurs between the pipes and the hook parts, which easily causes the ports of the pipes to be squeezed or collided and damaged, and it is extremely easy for the pipes to break away from the hooks. Moreover, when the lifting ropes are too long, the pipes are prone to swaying during startup or shutdown, and may collide with construction workers, causing accidental injuries. Summary of the Invention

[0005] The purpose of the utility model is to provide a lifting tool for ductile iron pipes to solve the problems raised in the above background technique.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] A ductile iron pipe hoisting tool, comprising a lifting beam with a hollow interior and a lifting lug provided in the middle of the upper end, rope outlets opened on the left and right side walls of the lifting beam, two reel assemblies rotatably arranged inside the lifting beam, two groups of lifting ropes respectively wound around the two reel assemblies and having opposite winding directions, a driving mechanism provided on the lifting beam and capable of driving the two reel assemblies to rotate simultaneously and in opposite directions, the movable ends of the two groups of lifting ropes respectively pass through the rope outlets on both sides and are connected to a hoisting fixture, and a fastener is provided on the hoisting fixture.

[0008] Preferably, the two reel assemblies are arranged in parallel. The reel assembly includes: a rotating shaft whose two ends are rotatably connected to the front and rear side walls of the lifting beam, and a reel body fixedly sleeved on the rotating shaft, and the lifting rope is wound around the reel body.

[0009] Preferably, the driving mechanism includes: two driving gears respectively fixedly sleeved on the two rotating shafts, a worm gear fixedly sleeved on any one of the rotating shafts, a worm whose two ends are respectively rotatably connected to the left and right side walls of the lifting beam and meshed with the worm gear, and a rotating handle connected to any end of the worm passing through the side wall of the lifting beam, and the two driving gears are meshed with each other.

[0010] Preferably, a braking mechanism is provided at one end of the worm outside the lifting beam. The braking mechanism includes: a brake disc fixedly sleeved on the worm, a plurality of card slots equidistantly opened along the circumferential direction of the brake disc, a П-shaped mounting seat located above the brake disc and connected to the outer side wall of the lifting beam, a threaded rod threadedly penetrating through the upper wall of the П-shaped mounting seat, a moving plate slidably connected to the two side walls of the П-shaped mounting seat and rotatably connected to the bottom end of the threaded rod, and a clamping block connected to the bottom of the moving plate, and the clamping block can be clamped in the card slot.

[0011] Preferably, a pushing mechanism is provided on each of the left and right sides inside the lifting beam. The pushing mechanism includes: a rotating shaft whose two ends are rotatably connected to the front and rear side walls of the lifting beam, a fixed shaft parallel to and located below the rotating shaft and whose two ends are fixedly connected to the front and rear side walls of the lifting beam, and pushing wheels respectively fixedly sleeved on the rotating shaft and the fixed shaft. The rotating shaft is connected to the rotating shaft through a transmission component. After the movable end of the lifting rope passes between the two pushing wheels, it then passes through the rope outlet and is connected to the hoisting fixture, and the lifting rope is squeezed between the two pushing wheels.

[0012] Preferably, an annular groove is opened on the middle surface of the pushing wheel, and the lifting rope is squeezed between the two annular grooves.

[0013] Preferably, the transmission component includes: a driving wheel connected to the rotating shaft, a driven wheel connected to the rotating shaft, and a transmission belt drivingly connected between the driving wheel and the driven wheel.

[0014] Preferably, the lifting fixture includes: a lower support plate, a vertical plate connected to one side of the lower support plate at the bottom end, a top plate connected to the upper end of the vertical plate, a lifting ring provided at the upper end of the top plate, and rubber pads provided on the upper end surface of the lower support plate and the inner side of the vertical plate. The fastener is provided between the lower support plate and the top plate, and the lower support plate, the vertical plate and the top plate form a [shape structure.

[0015] Preferably, the fastener includes: a clamping plate located between the lower support plate and the top plate, an adjusting rod rotatably connected to one end of the clamping plate and threadedly penetrating through the top plate at the other end, and a limiting rod fixedly connected to one end of the clamping plate and movably penetrating through the top plate at the other end. A rubber pad is provided on the lower end surface of the clamping plate.

[0016] Compared with the prior art, the advantages of the present utility model are as follows:

[0017] 1. In the present utility model, the driving assembly drives the two reel assemblies to rotate in opposite directions simultaneously, so that the distances that the suspension ropes at both ends extend can always be kept consistent. As a result, the lifting lugs on the lifting beam are always located in the middle of the pipeline, ensuring that the lifting point coincides with the center of gravity of the pipeline. This enables the pipeline to remain relatively stable during the lifting process, reduces the swaying and deviation caused by inconsistent lengths or uneven forces of the suspension ropes, further improves the stability of the pipeline during the lifting process, reduces the potential safety hazards caused by the deviation of the center of gravity, and improves the safety of the ductile iron pipeline lifting;

[0018] 2. The present utility model can accurately control the length of the suspension rope, thereby ensuring that when the lifting starts, moves, and stops, the swinging amplitude of the object being lifted is minimized. This greatly reduces the risk of accidental collision and injury between the pipeline and the surrounding environment as well as the construction personnel, improving the safety of the entire operation process; The shorter suspension rope enables the construction personnel to control the ductile iron pipe being lifted more directly and accurately. The operator can position the object being lifted to the designated position faster and make necessary adjustments, improving the positioning accuracy, saving time, and also improving the efficiency of the entire lifting operation;

[0019] 3. The present utility model uses a lifting fixture and a fastener to fix the pipeline. Through its strong clamping force and fastening force, the pipeline can be firmly fixed on the lifting equipment, thereby ensuring that the pipeline is evenly stressed during the lifting process, avoiding risks such as pipeline inclination and slipping caused by inaccurate positions of nylon slings or swaying of the hooks, and also reducing the risk of the pipeline port being collided; At the same time, the lifting fixture and the fastener can significantly shorten the time for lifting and placing the pipeline, improve the efficiency of the lifting operation, and reduce the labor cost and time cost;

[0020] 4. In the present utility model, the operator only needs to control the driving mechanism to realize the retraction and extension of the lifting rope and the fixation of the lifting fixture, without the need for multiple people to work simultaneously, reducing the complexity and difficulty of operation and improving work efficiency.

[0021] 5. By adjusting the length of the lifting rope and the position of the lifting fixture, the present utility model can meet the lifting requirements of ductile iron pipes with different lengths and diameters, and has strong versatility and flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is a schematic structural diagram of a ductile iron pipe lifting tool;

[0024] Figure 2 It is a schematic internal structure diagram of the lifting beam of a ductile iron pipe lifting tool;

[0025] Figure 3 It is a schematic structural diagram of the limiting mechanism of a ductile iron pipe lifting tool;

[0026] Figure 4 It is a schematic diagram of the lifting fixture and fastener mechanism of a ductile iron pipe lifting tool;

[0027] Reference numerals: 1 - lifting beam, 2 - lifting ear, 3 - rope outlet, 4 - drum assembly, 5 - lifting rope, 6 - driving mechanism, 7 - lifting fixture, 8 - fastener, 9 - rotating shaft, 10 - drum body, 11 - driving gear, 12 - worm gear, 13 - worm, 14 - rotating handle, 15 - braking mechanism, 16 - brake disc, 17 - clamping groove, 18 - П-shaped mounting seat, 19 - threaded rod, 20 - moving plate, 21 - clamping block, 22 - rotating shaft, 23 - fixed shaft, 24 - pushing wheel, 25 - annular groove, 26 - driving wheel, 27 - driven wheel, 28 - transmission belt, 29 - lower support plate, 30 - vertical plate, 31 - top plate, 32 - lifting ring, 33 - clamping plate, 34 - adjusting rod, 35 - limiting rod, 36 - rubber pad. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0029] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0030] In the description of the present utility model, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship in which the product of the present utility model is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0031] In addition, terms such as "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0032] In addition, terms such as "horizontal", "vertical", "hanging" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0033] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and limited, terms such as "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0034] It should be noted that the features in the embodiments of the present utility model can be combined with each other without conflict.

[0035] Such as Figures 1 - 4As shown in the figure, a lifting tool for ductile iron pipes includes a lifting beam 1 with a hollow interior and a lifting lug 2 provided in the middle of the upper end. Rope outlets 3 are opened on the left and right side walls of the lifting beam 1. Two reel assemblies 4 are rotatably arranged inside the lifting beam 1. Two sets of lifting ropes 5 are respectively wound around the two reel assemblies 4 and have opposite winding directions. A driving mechanism 6 is provided on the lifting beam 1 to drive the two reel assemblies 4 to rotate simultaneously and in opposite directions. The movable ends of the two sets of lifting ropes 5 respectively pass through the rope outlets 3 on both sides and are connected to a lifting fixture 7. A fastener 8 is provided on the lifting fixture 7.

[0036] Among them, the two reel assemblies 4 are arranged in parallel. The reel assembly 4 includes a rotating shaft 9 whose two ends are rotatably connected to the front and rear side walls of the lifting beam 1, and a reel body 10 fixedly sleeved on the rotating shaft 9. The lifting rope 5 is wound around the reel body 10.

[0037] When it is necessary to lift a ductile iron pipe, first start the driving component to drive the two reel assemblies 4 to rotate simultaneously. Since the two reel assemblies 4 rotate in opposite directions, the lifting ropes 5 wound around the reel assemblies 4 simultaneously extend through the rope outlets 3 and have the same extension length. The lifting fixture 7 is connected to the ductile iron pipe to be lifted through the fastener 8. Since the distances that the two ends of the lifting ropes 5 extend can always be kept consistent, it can be obtained that the lifting lug 2 on the lifting beam 1 is always located in the middle of the pipe, thereby ensuring that the lifting point coincides with the center of gravity of the pipe, making the pipe keep relatively stable during the lifting process, reducing the shaking and deviation caused by the inconsistent lengths or uneven forces of the lifting ropes 5, further improving the stability of the pipe during the lifting process, reducing the safety hazards caused by the deviation of the center of gravity, and improving the safety of lifting ductile iron pipes.

[0038] As Figure 2 shown in the figure, the driving mechanism 6 includes two driving gears 11 respectively and fixedly sleeved on the two rotating shafts 9, a worm gear 12 fixedly sleeved on any one of the rotating shafts 9, a worm 13 whose two ends are respectively rotatably connected to the left and right side walls of the lifting beam 1 and meshes with the worm gear 12, and a rotating handle 14 connected to the side wall of the lifting beam 1 through any end of the worm 13. The two driving gears 11 mesh with each other.

[0039] The working principle of the driving mechanism 6 is as follows: Manually rotating the handle drives the worm 13 to rotate. Then, through the worm and worm gear transmission mechanism, the engaged worm gear 12 and the rotating shaft 9 fixed thereon are driven to rotate. Further, the driving gear 11 fixedly sleeved on the rotating shaft 9 is driven to rotate, so that the two mutually engaged driving gears 11 rotate synchronously. The synchronously rotating driving gears 11 drive the two rotating shafts 9 to rotate synchronously, and then the drum bodies 10 fixed on the rotating shafts 9 rotate in opposite directions synchronously, so that the length of the lifting rope 5 can be accurately controlled. Further, when hoisting starts, moves, and stops, the swinging amplitude of the object being hoisted is minimized, greatly reducing the risk of accidental collision and injury between the pipeline and the surrounding environment and the construction personnel, and improving the safety of the entire operation process. The shorter lifting rope 5 enables the construction personnel to control the ductile iron pipe being hoisted more directly and accurately. The operator can position the object being hoisted at the designated position faster and make necessary adjustments, improving the positioning accuracy, saving time, and also improving the efficiency of the entire hoisting operation.

[0040] In order to lock the position of the worm when needed, prevent its accidental rotation, and then lock the drum assembly, the safety and stability of the device are improved. As Figure 3 shown, one end of the worm 13 located outside the lifting beam 1 is provided with a braking mechanism 15. The braking mechanism 15 includes: a brake disc 16 fixedly sleeved on the worm 13, a plurality of card slots 17 equidistantly opened along the circumferential direction of the brake disc 16, a П-shaped mounting seat 18 located above the brake disc 16 and connected to the outer side wall of the lifting beam 1, a threaded rod 19 threadedly penetrating the upper wall of the П-shaped mounting seat 18, a moving plate 20 slidably connected to the two side walls of the П-shaped mounting seat 18 and rotatably connected to the bottom end of the threaded rod 19, and a clamping block 21 connected to the bottom of the moving plate 20. The clamping block 21 can be clamped in the card slot 17. When the braking mechanism 15 needs to be activated, the threaded rod 19 is rotated so that the moving plate 20 moves up and down in the П-shaped mounting seat 18 in its vertical direction. When the moving plate 20 moves to a suitable position, the clamping block 21 can be inserted into the card slot 17 on the brake disc 16, thereby locking the position of the worm 13.

[0041] As Figure 2 shown, a pushing mechanism is provided on each of the left and right sides inside the lifting beam 1. The pushing mechanism includes: a rotating shaft 22 whose two ends are rotatably connected to the front and rear side walls of the lifting beam 1, a fixed shaft 23 parallel to and located below the rotating shaft 22 and whose two ends are fixedly connected to the front and rear side walls of the lifting beam 1, and pushing wheels 24 fixedly sleeved on the rotating shaft 22 and the fixed shaft 23 respectively. The rotating shaft 22 is connected to the rotating shaft 9 through a transmission component. The movable end of the lifting rope 5 passes through between the two pushing wheels 24 and then passes through the rope outlet 3 to be connected to the lifting fixture 7. The lifting rope 5 is squeezed between the two pushing wheels 24.

[0042] Wherein, the transmission assembly includes: a driving wheel 26 connected to the rotating shaft 9, a driven wheel 27 connected to the rotating shaft 22, and a transmission belt 28 drivingly connected between the driving wheel 26 and the driven wheel 27.

[0043] When the rotating shaft 9 rotates, the driving wheel 26 connected thereto also rotates accordingly. The driving wheel 26 transmits power to the driven wheel 27 through the transmission belt 28. The rotation of the driven wheel 27 drives the rotation of the rotating shaft 22, and further causes the pushing wheel 24 fixedly sleeved on the rotating shaft 22 to rotate. Since the pushing wheel 24 is disposed opposite to another pushing wheel 24 on the fixed shaft 23, the space therebetween becomes the passage for the suspension rope 5. When the pushing wheels 24 rotate, the friction therebetween will push the passing suspension rope 5 to move, so that the suspension rope 5 can extend or retract from the rope outlet 3 better, and further makes the adjustment of the suspension rope 5 more stable and controllable, thereby improving the efficiency, safety and precision of the hoisting operation.

[0044] Wherein, in order to further limit the suspension rope 5, an annular groove 25 is formed on the middle surface of the pushing wheel, and the suspension rope 5 is pressed between the two annular grooves 25.

[0045] As Figure 4 shown, the hoisting fixture 7 includes: a lower support plate 29, a vertical plate 30 whose bottom end is connected to one side of the lower support plate 29, a top plate 31 connected to the upper end of the vertical plate 30, a lifting ring 32 disposed on the upper end of the top plate 31, and rubber pads 36 disposed on the upper end surface of the lower support plate 29 and the inner side of the vertical plate 30. The fastener 8 is disposed between the lower support plate 29 and the top plate 31, and the lower support plate 29, the vertical plate 30 and the top plate 31 form a [shape structure.

[0046] Wherein, the fastener 8 includes: a clamping plate 33 located between the lower support plate 29 and the top plate 31, an adjusting rod 34 whose one end is rotatably connected to the clamping plate 33 and the other end threadedly penetrates through the top plate 31, and a limiting rod 35 whose one end is fixedly connected to the clamping plate 33 and the other end movably penetrates through the top plate 31. A rubber pad 36 is provided on the lower end surface of the clamping plate 33.

[0047] When the lifting fixture 7 is in use, since the adjusting rod 34 is rotatably connected to the clamping plate 33 and the adjusting rod 34 is threaded through the top plate 31 and rotated, rotating the adjusting rod 34 will cause the clamping plate 33 to move in the vertical direction of the top plate 31. At the same time, the limiting rod 35 ensures that the clamping plate 33 remains horizontally stable and does not deflect during the movement. As the clamping plate 33 moves downward, the gap between it and the lower supporting plate 29 decreases, thereby clamping the pipe wall of the ductile iron pipe, ensuring the safety during the lifting process, and also making the clamping and loosening operations simple and fast, improving the work efficiency. The rubber pads 36 provided on the upper end surface of the lower supporting plate 29, the inner side of the vertical plate 30 and the lower end surface of the clamping plate 33 increase the friction between the fixture and the pipe, prevent sliding, and at the same time reduce the damage to the surface of the object being lifted.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described by referring to the preferred embodiments of the present invention, those of ordinary skill in the art should understand that various changes can be made in form and details without departing from the spirit and scope of the present invention defined by the appended claims.

Claims

1. A ductile iron pipe hoisting tool, characterized in that: It includes a lifting beam (1) with a hollow interior and a lifting lug (2) provided in the middle of the upper end, rope outlets (3) opened on the left and right side walls of the lifting beam (1), two reel assemblies (4) rotatably arranged inside the lifting beam (1), two groups of lifting ropes (5) respectively wound around the two reel assemblies (4) and with opposite winding directions, a driving mechanism (6) provided on the lifting beam (1) and capable of driving the two reel assemblies (4) to rotate simultaneously and in opposite directions, the movable ends of the two groups of lifting ropes (5) respectively pass through the rope outlets (3) on both sides and are connected to a lifting fixture (7), and a fastener (8) is provided on the lifting fixture (7).

2. The ductile iron pipe hoisting tool according to claim 1, wherein: The two reel assemblies (4) are arranged in parallel, and the reel assembly (4) includes: a rotating shaft (9) with both ends rotatably connected to the front and rear side walls of the lifting beam (1), and a reel body (10) fixedly sleeved on the rotating shaft (9), and the lifting rope (5) is wound around the reel body (10).

3. The ductile iron pipe hoisting tool according to claim 2, characterized in that: The driving mechanism (6) includes: two driving gears (11) respectively fixedly sleeved on the two rotating shafts (9), a worm gear (12) fixedly sleeved on any one of the rotating shafts (9), a worm (13) with both ends respectively rotatably connected to the left and right side walls of the lifting beam (1) and meshing with the worm gear (12), and a rotating handle (14) connected to the end of the worm (13) penetrating through the side wall of the lifting beam (1), and the two driving gears (11) are meshed with each other.

4. The ductile iron pipe hoisting tool according to claim 3, characterized in that: A braking mechanism (15) is provided at one end of the worm (13) located outside the lifting beam (1), and the braking mechanism (15) includes: a brake disc (16) fixedly sleeved on the worm (13), a plurality of card slots (17) equidistantly opened along the circumferential direction of the brake disc (16), a П-shaped mounting seat (18) located above the brake disc (16) and connected to the outer side wall of the lifting beam (1), a threaded rod (19) threadedly penetrating through the upper wall of the П-shaped mounting seat (18), a moving plate (20) slidably connected to the two side walls of the П-shaped mounting seat (18) and rotatably connected to the bottom end of the threaded rod (19), and a clamping block (21) connected to the bottom of the moving plate (20), and the clamping block (21) can be clamped in the card slot (17).

5. The ductile iron pipe hoisting tool according to claim 3, wherein: A pushing mechanism is provided on each of the left and right sides inside the lifting beam (1), and the pushing mechanism includes: a rotating shaft (22) with both ends rotatably connected to the front and rear side walls of the lifting beam (1), a fixed shaft (23) parallel to and located below the rotating shaft (22) and with both ends fixedly connected to the front and rear side walls of the lifting beam (1), and pushing wheels (24) respectively fixedly sleeved on the rotating shaft (22) and the fixed shaft (23), the rotating shaft (22) is connected to the rotating shaft (9) through a transmission component, the movable end of the lifting rope (5) passes between the two pushing wheels (24) and then passes through the rope outlet (3) to be connected to the lifting fixture (7), and the lifting rope (5) is squeezed between the two pushing wheels.

6. The lifting tool for ductile iron pipes according to claim 5, wherein: An annular groove (25) is opened on the middle surface of the pushing wheel, and the lifting rope (5) is squeezed between the two annular grooves (25).

7. The lifting tool for ductile iron pipes according to claim 5, characterized in that: The transmission assembly includes: a driving wheel (26) connected to the rotating shaft (9), a driven wheel (27) connected to the rotating shaft (22), and a transmission belt (28) drivingly connected between the driving wheel (26) and the driven wheel (27).

8. A ductile iron pipe hoisting tool according to claim 1, characterized in that: The lifting fixture (7) includes: a lower support plate (29), a vertical plate (30) with its bottom end connected to one side of the lower support plate (29), a top plate (31) connected to the upper end of the vertical plate (30), a lifting ring (32) provided at the upper end of the top plate (31), and rubber pads (36) provided on the upper end surface of the lower support plate (29) and the inner side of the vertical plate (30). The fastener (8) is provided between the lower support plate (29) and the top plate (31), and the lower support plate (29), the vertical plate (30) and the top plate (31) form a [shape structure.

9. The lifting tool for ductile iron pipes according to claim 8, characterized in that: The fastener (8) includes: a clamping plate (33) located between the lower support plate (29) and the top plate (31), an adjusting rod (34) with one end rotatably connected to the clamping plate (33) and the other end threadedly penetrating through the top plate (31), and a limiting rod (35) with one end fixedly connected to the clamping plate (33) and the other end movably penetrating through the top plate (31). A rubber pad (36) is provided on the lower end surface of the clamping plate (33).

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