Lifting device for sewage lift pump of sewage treatment plant

Abstract

The invention discloses a lifting device for a sewage lift pump of a sewage treatment plant, which comprises a door-shaped frame, a movable base, a pulley assembly, a winding structure and a lifting hook assembly, a steel wire rope is arranged on the inner side of the door-shaped frame in an M shape, and the lifting hook assembly is provided with a tension detection structure consisting of a strain gauge and a data processing unit and is in signal linkage with the pulley assembly. A pulley assembly at the top of the door-shaped frame can slide horizontally and is matched with a double-movable-pulley structure to increase the lifting stroke, the height limitation of a pump house crane is broken through, and one-time continuous lifting of the deep pool lifting pump is achieved; the tension detection structure monitors the stress of the steel wire rope in real time, automatically adjusts the position of the fixed pulley to balance the load, and avoids deflection, collision and overload fracture. The device is stable in structure and flexible to move, can adapt to different working conditions without modifying a pump room, omits dangerous procedures such as segmented hoisting and high-altitude connection, greatly improves the overhauling efficiency and the operation safety, effectively protects the pump body structure, and is suitable for hoisting and overhauling of various deep pool sewage lifting pumps.

Description

Technical Field

[0001] This invention relates to the field of hoisting equipment technology, and in particular to a hoisting device for a sewage lift pump in a sewage treatment plant. Background Technology

[0002] In the operation system of a wastewater treatment plant, the influent pumping station is a critical pretreatment link. Its core function is to receive wastewater from the municipal sewer network, pressurize and lift the wastewater to subsequent treatment units such as sedimentation tanks and biological treatment tanks via wastewater lift pumps, and flexibly adjust the influent flow rate according to the load of subsequent processes to ensure the stable operation of the wastewater treatment system. Among them, the wastewater lift pump, as the core power equipment, operates in the wastewater medium for a long time and is prone to problems such as impeller blockage and motor failure, requiring shutdown for maintenance. The equipment hoisting operation before maintenance is a key step to ensure maintenance efficiency and safety.

[0003] Currently, some wastewater treatment plant influent pump stations face a contradiction due to structural limitations: "the pump pool is deep, but the crane height is insufficient." The bottom of the pump pool is generally about 10 meters above the ground, while the crane installed above the pump station is only about 5 meters above the ground, which cannot meet the requirement of lifting the wastewater lift pump from the bottom of the pool to the ground in one go. To solve this problem, existing maintenance operations require a segmented lifting method. First, steel wire ropes or chains are pre-connected to the lifting rings of the wastewater lift pump. When equipment fails, the crane first lifts the slings to raise the pump body 5 meters from the bottom of the pool (i.e., the crane reaches its maximum lifting height). Then, channel steel or steel pipes are erected on both sides of the pump pool, and the slings are fixed again using components such as bullnose hooks. Then, the crane hook is lowered and re-hooked, and this operation is repeated at least 3 times to completely lift the pump body out of the pump pool.

[0004] This segmented lifting method has significant drawbacks: Firstly, during multiple lifting operations, the pump body needs to frequently pause and change lifting points in the air, increasing the probability of collisions and friction between the pump body and the inner wall of the pump pool, the supporting channel steel, and other objects. This can easily lead to deformation of the pump body shell and damage to sealing components, which not only prolongs the maintenance period but may also reduce the subsequent operating accuracy of the equipment. Secondly, operators need to repeatedly perform sling connection and fixing operations on both sides of the pump pool (a dangerous area 10 meters above the bottom of the pool). If safety protection measures are not in place, it is very easy for personnel to fall, posing a serious threat to the life safety of the operators. Summary of the Invention

[0005] The technical problem to be solved by this invention is that the pump pool is too deep and the crane cannot lift the sewage lift pump in one go.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a hoisting device for a sewage lifting pump in a sewage treatment plant, comprising a gantry frame and a movable base fixed to the bottom of the gantry frame. Pulley assemblies are horizontally slidably installed at both ends of the top of the gantry frame. Hoisting structures are installed on both inner sides of the bottom of the gantry frame. A wire rope is arranged inside the gantry frame and is configured in an M-shape through the hoisting structures and pulley assemblies. A hook assembly is connected to the middle of the wire rope. A tension detection structure for monitoring the tension of the wire rope is installed on the hook assembly, and the tension detection structure is signal-connected to the pulley assembly.

[0007] Preferably, the portal frame includes a top rod horizontally arranged in the middle and vertical poles fixed at both ends of the top rod. The poles are fixed on the movable base, and diagonal braces are connected to both sides of the poles. The bottom ends of the diagonal braces are connected to the movable base. The top rod is an I-beam structure.

[0008] Preferably, the pulley assembly includes a U-shaped movable seat, with movable wheels rotatably mounted on the opposite inner sidewalls of the movable seat, a fixed pulley rotatably connected to the bottom of the movable seat, the fixed pulley being located directly below the center of the movable seat, a drive unit for driving the movable wheels to rotate being mounted on the outer wall of the movable seat, the tension detection structure being signal-connected to the drive unit, and the movable wheels being located in through grooves on both sides of the top rod.

[0009] Preferably, the drive unit includes a transmission assembly fixed on the movable base and a movable motor mounted on the transmission assembly. The transmission assembly includes a large gear and a small gear that mesh with each other. The small gear is mounted on the output shaft of the movable motor, and the large gear is connected to the mounting shaft of the movable wheel.

[0010] Preferably, the hook assembly includes a lifting base, a through groove is provided on the side wall of the lifting base, and movable pulleys are rotatably installed at the bottom and top of the through groove. The wire rope passes between the two movable pulleys, and a hook is fixedly connected to the bottom end of the lifting base. The tension detection structure is installed on the top of the lifting base.

[0011] Preferably, the tension detection structure includes a data processing unit fixed to the top of the lifting base, the data processing unit is connected to a strain gauge, the strain gauge is fixed to the wire rope, the data processing unit is provided with a signal module, and the signal module is connected to the control unit of the pulley assembly.

[0012] Preferably, limit sleeves are fixedly fitted on the wire ropes on both sides of the lifting base, and the limit sleeves are signal connected to the signal module. The limit sleeves are located between the lifting base and the strain gauge.

[0013] Preferably, the movable base includes a base plate, with support wheels installed at the bottom of the base plate, and a first and second reinforcing steel of an I-beam structure fixedly installed at the top of the base plate. The bottom end of the gantry frame is fixed at the top middle of the first reinforcing steel. The second reinforcing steel is arranged perpendicular to the first reinforcing steel and is equidistantly distributed along the length direction of the first reinforcing steel. The hoisting structure is installed on the second reinforcing steel.

[0014] Preferably, the winch structure includes a winch and a winch mounting base plate, with the winch mounting base plate fixed to the second reinforcing steel.

[0015] A method for hoisting a sewage lift pump in a sewage treatment plant, using the aforementioned hoisting device, includes the following steps: S1. First, drain the water collection tank in the water inlet pump room, clean the debris and sediment at the bottom of the tank, check the support stability of the movable base, ensure that the support wheels and gantry frame are not loose, and check that the tension testing structure is operating normally. S2. Move the hoisting device directly above the sewage lift pump, control the winch structure to unwind the wire rope, connect the hook assembly to the lifting lug of the sewage lift pump, check the fit between the wire rope and the fixed pulley and the movable pulley, ensure that the wire rope is free from wear and broken wires, and that the limit sleeve is installed in place. S3. Start the structure to wind up, and simultaneously control the movement of the two pulley assemblies. Based on the tension data detected by the strain gauges, dynamically adjust the position of the fixed pulley at the bottom of the pulley assembly to optimize the force angle of the wire rope. If the tension of the wire rope on one side of the hook assembly is abnormal, adjust the position of the moving seat through the drive unit to drive the fixed pulley to move, so that the wire ropes on both sides of the hook assembly are at the same angle, ensuring that the tension on both sides is balanced. S4. After the sewage lift pump is lifted to the designated height, move the gantry frame to the unloading area, slowly lower the hook, and place the sewage lift pump steadily on the ground to complete the hoisting operation.

[0016] This invention provides a hoisting device for a sewage lift pump in a sewage treatment plant, which has the following beneficial effects.

[0017] 1. The device adopts an integrated structure combining a movable base and a gantry frame, with support wheels and multiple reinforcing steels, giving it strong structural stability and mobility. It can be freely moved and quickly positioned within the water intake pumping station without modifying the existing pumping station building structure. It can adapt to water collection tanks of different depths and sizes, greatly improving the device's versatility and on-site practicality.

[0018] 2. The top of the gantry frame adopts a horizontally sliding pulley assembly, combined with an M-type wire rope winding method, which significantly increases the effective lifting stroke. This can overcome the limitation of insufficient height of the original crane in the pump house, and realize the continuous lifting of sewage lift pumps in deep pools in one go. It completely eliminates complex procedures such as segmented lifting, mid-air pauses, and multiple hook changes, greatly shortens maintenance time, and improves the operation and maintenance efficiency of sewage treatment plants.

[0019] 3. The hook assembly adopts an upper and lower double-acting pulley structure, which increases the wrap angle and force-bearing area of ​​the wire rope, so that the load is evenly distributed on the contact surface between the wire rope and the pulley, effectively reducing local stress concentration, while improving the stability of the lifting process, avoiding swaying and twisting of the pump body during the ascent, and reducing the risk of collision between the pump body and the pool wall.

[0020] 4. A tension detection structure consisting of strain gauges and a data processing unit is installed on the hook assembly. This structure can collect tension data of the wire ropes on both sides in real time and accurately, and promptly identify abnormal states such as overload and uneven stress. This enables online monitoring and safety warnings throughout the hoisting process, avoiding major safety hazards such as wire rope breakage due to overload and pump body falling from a structural perspective, and significantly improving the safety of hoisting operations. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a structural front view of an embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of the pulley assembly in an embodiment of the present invention.

[0023] Figure 3 This is a schematic diagram of the reinforcing steel structure in an embodiment of the present invention.

[0024] In the diagram: 1. Movable base; 2. Gantry frame; 3. Hook assembly; 4. Pulley assembly; 5. Wire rope; 11. Base plate; 12. Support wheel; 13. First reinforcing steel; 14. Second reinforcing steel; 15. Winch; 21. Top rod; 22. Diagonal brace; 31. Lifting bracket; 32. Moving pulley; 33. Hook; 34. Signal module; 35. Strain gauge; 36. Limit sleeve; 41. Movable base; 42. Movable wheels; 43. Transmission assembly; 44. Fixed pulley; 45. Movable motor. Detailed Implementation

[0025] like Figures 1 to 3As shown, the present invention provides a hoisting device for a sewage lift pump in a sewage treatment plant, including a gantry frame 2 and a movable base 1 fixed to the bottom of the gantry frame 2. Both ends of the top of the gantry frame 2 are horizontally slidably equipped with pulley assemblies 4. Both inner sides of the bottom of the gantry frame 2 are equipped with winch structures. A wire rope 5 is arranged inside the gantry frame 2 and is configured into an M-shape by the winch structures and pulley assemblies 4. A hook assembly 3 is connected to the middle of the wire rope 5. A tension detection structure is provided on the hook assembly 3 to monitor the tension of the wire rope 5. The tension detection structure is signal-connected to the pulley assembly 4.

[0026] The width of the gantry frame 2 is designed according to the width of the water collection tank in the inlet pumping station to ensure that the gantry frame 2 can be moved directly above the sewage lift pump. During the hoisting of the sewage lift pump, two winch structures on the inner side of the gantry frame 2 simultaneously wind up the wire rope 5, cooperating with the pulley assembly 4 to lift the hook assembly 3 in the middle of the wire rope 5. During the lifting process, as the angle between the wire ropes 5 on both sides of the hook assembly 3 continuously increases, the tension on the wire rope 5 continuously increases. At this time, by controlling the relative movement of the pulley assembly 4, the distance between the two pulley assemblies 4 is shortened, reducing the angle between the wire ropes 5 on both sides of the hook assembly 3, reducing the tension on the wire rope, and ensuring the safety of the wire rope 5. The tension detection structure monitors the tension of the wire rope 5 in real time. During the lifting of the sewage lift pump, the tension monitored by the tension detection structure continuously increases. At this time, the signal is transmitted to the pulley assembly 4, controlling the two pulley assemblies 4 to move at a uniform speed, maintaining the force on the wire rope 5 within the set range, further improving the stability of the wire rope 5's operation.

[0027] like Figure 1 As shown. The portal frame 2 includes a horizontally positioned top rod 21 in the middle and vertically fixed to both ends of the top rod 21. The vertical rods are fixed to the movable base 1, and diagonal braces 22 are connected to both sides of the vertical rods. The bottom ends of the diagonal braces 22 are connected to the movable base 1. The top rod 21 is an I-beam structure. The top rod 21 is made of I-beam to prevent bending during the lifting of the sewage pump, ensuring the stability of the device operation. The diagonal braces 22 are used to support the vertical rods and maintain their verticality.

[0028] like Figure 1 and Figure 2As shown. The pulley assembly 4 includes a U-shaped movable seat 41. Movable wheels 42 are rotatably mounted on the opposite inner sidewalls of the movable seat 41. A fixed pulley 44 is rotatably connected to the bottom of the movable seat 41, located directly below the center of the movable seat 41. A drive unit for driving the movable wheels 42 to rotate is provided on the outer wall of the movable seat 41. The tension detection structure is signal-connected to the drive unit. The movable wheels 42 are located in the through grooves on both sides of the top rod 41. Movable wheels 42 are installed on the opposite inner sidewalls of the movable seat 41, providing sliding support for the movable seat 41. The movable wheels 42 on both sides are located in the horizontal grooves on both sides of the top rod 21. The inner sidewall of the movable seat 41 fits against the outer sidewall of the top rod 21, ensuring accurate movement of the movable seat 41.

[0029] like Figure 1 and Figure 2 As shown. The drive unit includes a transmission assembly 43 fixed to the movable base 41 and a movable motor 45 mounted on the transmission assembly 43. The transmission assembly 43 includes a large gear and a small gear meshing with each other. The small gear is mounted on the output shaft of the movable motor 45, and the large gear is connected to the mounting shaft of the movable wheel 42. The movable motor 45 drives the small gear to rotate, which in turn drives the large gear meshing with it to rotate. The large gear drives the mounting shaft of the movable wheel 42 to rotate, thereby driving the movable wheel 42 to rotate. This achieves stable movement of the movable wheel 42 through a deceleration drive. Anti-slip textures are also provided on the outer wall of the movable wheel 42 to prevent slippage during the rolling process.

[0030] like Figure 1 As shown. The hook assembly 3 includes a lifting base 31, with a through groove on the side wall of the lifting base 31. Movable pulleys 32 are rotatably mounted at the bottom and top of the through groove. The wire rope 5 passes between the two movable pulleys 32. A hook 33 is fixedly connected to the bottom end of the lifting base 31. The tension detection structure is installed on the top of the lifting base 31. A pair of movable pulleys 32 are arranged vertically inside the lifting base 31, with a gap between them. An annular groove is provided on the outer side wall of the movable pulley 32 to fit the wire rope 5 and prevent it from slipping off the pulley. The wire rope 5 is wound up by a winch structure, pulling the middle of the wire rope 5 upwards, which in turn moves the lifting base 31 and the hook 33 at the bottom of the lifting base 31 upwards, thus lifting the sewage lifting pump.

[0031] like Figure 1As shown. The tension detection structure includes a data processing unit fixed to the top of the lifting base 31. The data processing unit is connected to a strain gauge 35, which is fixed to the wire rope 5. A signal module 34 is provided on the data processing unit and is signal-connected to the control unit of the pulley assembly 4 through the signal module 34. The strain gauge 35 is fixed to the wire rope 5 by attachment. According to the expansion and contraction of the wire rope 5, the mechanical deformation is converted into an electrical signal and transmitted to the data processing unit in real time. The data processing unit amplifies and processes the received deformation signal and converts it into the real-time tension value of the wire rope 5. Then, the tension data is sent to the control unit of the pulley assembly 4 through the signal module 34 to provide a basis for the position adjustment of the fixed pulley 44.

[0032] like Figure 1 As shown. Limit sleeves 36 are fixedly fitted onto the wire ropes 5 on both sides of the lifting base 31. The limit sleeves 36 are signal-connected to the signal module 34 and are located between the lifting base 31 and the strain gauge 35. The limit sleeves 36 are proximity switch structures. When the lifting base 31 deviates along the wire rope 5 and approaches either limit sleeve 36, the limit sleeve 36 immediately sends a sensing signal to the signal module 34, indicating that the hook assembly 3 is deviating from its centered position, the wire ropes 5 on both sides are under uneven stress, or the winches 15 at both ends are not synchronized in their winding and unwinding. After receiving this signal, the data processing unit automatically controls the corresponding side pulley assembly 4 to adjust its horizontal displacement or corrects the rotation speed of the winches 15 on both sides, so that the hook assembly 3 quickly returns to its centered state. This achieves automatic correction during the lifting process, ensuring the pump body rises smoothly and vertically, and avoiding shaking, jamming, and equipment collisions caused by uneven loading or asynchrony.

[0033] like Figure 1 and Figure 3 As shown. The movable base 1 includes a base plate 11, with support wheels 12 installed at the bottom of the base plate 11. A first reinforcing steel 13 and a second reinforcing steel 14 of an I-beam structure are fixedly installed on the top of the base plate 11. The bottom end of the gantry frame 2 is fixed to the middle of the top of the first reinforcing steel 13. The second reinforcing steel 14 is arranged perpendicular to the first reinforcing steel 14 and is equidistantly distributed along the length of the first reinforcing steel 13. The hoisting structure is installed on the second reinforcing steel 14. The first reinforcing steel 13 and the second reinforcing steel 14 intersect perpendicularly to form a rigid load-bearing frame, which can effectively disperse the vertical load and lateral overturning force transmitted by the gantry frame 2 and the hoist 15, preventing the base plate 11 from bending and deforming during heavy lifting. This also improves the stability and torsional resistance of the entire hoisting device during operation, ensuring that it does not shake or shift during the hoisting process.

[0034] like Figure 1As shown. The winch structure includes a winch 15 and a winch mounting base plate, which is fixed to the second reinforcing steel 14. The winch 15 is securely mounted on the second reinforcing steel 14 via the independent winch mounting base plate, ensuring that the tension centerline of the winch 15 is aligned with the direction of the wire rope. This reduces wire rope wear and additional stress, and facilitates symmetrical arrangement and synchronous drive of two winches 15, providing a structural foundation for subsequent tension balancing and automatic correction.

[0035] A method for hoisting a sewage lift pump in a sewage treatment plant, using the aforementioned hoisting device, includes the following steps: S1. First, drain the water collection tank in the water inlet pump room, clean the debris and sediment at the bottom of the tank, check the support stability of the movable base 1, ensure that the support wheels 12 and the gantry frame 2 are not loose, and check that the tension testing structure is operating normally. S2. Move the hoisting device directly above the sewage lift pump, control the winch structure to unwind the wire rope 5, connect the hook assembly 3 to the lifting lug of the sewage lift pump, check the fit between the wire rope 5 and the fixed pulley 44 and the movable pulley 32, ensure that the wire rope 5 is free from wear and broken wires, and install the limit sleeve 36 in place. S3. Start the structure to wind up, and simultaneously control the movement of the two pulley assemblies 4. According to the tension data detected by the strain gauge 35, dynamically adjust the position of the fixed pulley 44 at the bottom of the pulley assembly 4 to optimize the force angle of the wire rope 5. If the tension of the wire rope 5 on one side of the hook assembly 3 is abnormal, adjust the position of the moving seat 41 through the drive unit 43 to drive the fixed pulley 44 to move, so that the wire ropes 5 on both sides of the hook assembly 3 are at the same angle, ensuring that the tension on both sides is balanced. S4. After the sewage lift pump is lifted to the designated height, move the gantry frame 2 to the unloading area, slowly lower the hook 33, and place the sewage lift pump steadily on the ground to complete the hoisting operation.

Claims

1. A hoisting device for a sewage lift pump in a sewage treatment plant, characterized in that: Includes a portal frame (2) and a movable base (1) fixed at the bottom of the portal frame (2). Both ends of the top of the portal frame (2) are horizontally slidably equipped with pulley assemblies (4). Both inner sides of the bottom of the portal frame (2) are equipped with winch structures. A steel wire rope (5) is arranged inside the portal frame (2) and the steel wire rope (5) is set into an M shape through the winch structure and pulley assembly (4). A hook assembly (3) is connected to the middle of the steel wire rope (5). A tension detection structure for monitoring the tension of the steel wire rope (5) is set on the hook assembly (3). The tension detection structure is connected to the pulley assembly (4).

2. The hoisting device for a sewage lift pump in a sewage treatment plant as described in claim 1, characterized in that: The portal frame (2) includes a top rod (21) horizontally arranged in the middle and vertical poles fixed at both ends of the top rod (21). The poles are fixed on the movable base (1). Both sides of the poles are connected to diagonal braces (22). The bottom end of the diagonal braces (22) is connected to the movable base (1). The top rod (21) is an I-beam structure.

3. The hoisting device for a sewage lift pump in a sewage treatment plant as described in claim 2, characterized in that: The pulley assembly (4) includes a U-shaped movable seat (41), with movable wheels (42) rotatably mounted on the inner sidewalls of the movable seat (41), and a fixed pulley (44) rotatably connected to the bottom of the movable seat (41). The fixed pulley (44) is located directly below the center of the movable seat (41). A drive unit for driving the movable wheels (42) to rotate is provided on the outer wall of the movable seat (41). The tension detection structure is signal-connected to the drive unit. The movable wheels (42) are located in the through grooves on both sides of the top rod (41).

4. The hoisting device for a sewage lift pump in a sewage treatment plant as described in claim 3, characterized in that: The drive unit includes a transmission assembly (43) fixed on the movable base (41) and a movable motor (45) mounted on the transmission assembly (43). The transmission assembly (43) includes a large gear and a small gear that mesh with each other. The small gear is mounted on the output shaft of the movable motor (45), and the large gear is connected to the mounting shaft of the movable wheel (42).

5. The hoisting device for a sewage lift pump in a sewage treatment plant as described in claim 1, characterized in that: The hook assembly (3) includes a lifting seat (31), a through groove is provided on the side wall of the lifting seat (31), and movable pulleys (32) are rotatably installed at the bottom and top of the through groove. The wire rope (5) passes through the two movable pulleys (32). A hook (33) is fixedly connected to the bottom end of the lifting seat (31). The tension detection structure is installed on the top of the lifting seat (31).

6. The hoisting device for a sewage lift pump in a sewage treatment plant as described in claim 5, characterized in that: The tensile testing structure includes a data processing unit fixed on the top of the lifting base (31), the data processing unit is connected to a strain gauge (35), the strain gauge (35) is fixed on the wire rope (5), the data processing unit is provided with a signal module (34), and is signal connected to the control unit of the pulley assembly (4) through the signal module (34).

7. The hoisting device for a sewage lift pump in a sewage treatment plant as described in claim 6, characterized in that: Limit sleeves (36) are fixedly fitted on the wire ropes (5) on both sides of the lifting base (31). The limit sleeves (36) are signal connected to the signal module (34). The limit sleeves (36) are located between the lifting base (31) and the strain gauge (35).

8. The hoisting device for a sewage lift pump in a sewage treatment plant as described in claim 1, characterized in that: The mobile base (1) includes a base plate (11), a support wheel (12) is installed at the bottom of the base plate (11), and a first reinforcing steel (13) and a second reinforcing steel (14) of an I-beam structure are fixedly installed on the top of the base plate (11). The bottom end of the gantry frame (2) is fixed in the middle of the top of the first reinforcing steel (13). The second reinforcing steel (14) is arranged perpendicular to the first reinforcing steel (14) and is equidistantly distributed along the length direction of the first reinforcing steel (13). The hoisting structure is installed on the second reinforcing steel (14).

9. The hoisting device for a sewage lift pump in a sewage treatment plant as described in claim 8, characterized in that: The winch structure includes a winch (15) and a winch mounting base plate, which is fixed on the second reinforcing steel (14).

10. A method for hoisting a sewage lift pump in a sewage treatment plant, characterized in that, The application of the hoisting device as described in any one of claims 1-9 includes the following steps: S1. First, drain the water collection tank of the water inlet pump room, clean the debris and sediment at the bottom of the tank, check the support stability of the movable base (1), ensure that the support wheel (12) and the gantry frame (2) are not loose, and check that the tension detection structure is operating normally. S2. Move the hoisting device directly above the sewage lift pump, control the winch structure to unwind the wire rope (5), connect the hook assembly (3) to the lifting lug of the sewage lift pump, check the fit between the wire rope (5) and the fixed pulley (44) and the movable pulley (32), ensure that the wire rope (5) is free from wear and broken wires, and install the limit sleeve (36) in place. S3. Start the structure to wind up, and simultaneously control the two pulley assemblies (4) to move. According to the tension data detected by the strain gauge (35), dynamically adjust the position of the fixed pulley (44) at the bottom of the pulley assembly (4) to optimize the force angle of the wire rope (5). If the tension of the wire rope (5) on one side of the hook assembly (3) is abnormal, adjust the position of the moving seat (41) through the drive unit (43) to drive the fixed pulley (44) to move, so that the wire ropes (5) on both sides of the hook assembly (3) are at the same angle, ensuring that the tension on both sides is balanced. S4. After the sewage lift pump is lifted to the designated height, move the gantry frame (2) to the unloading area, slowly lower the hook (33), and place the sewage lift pump steadily on the ground to complete the hoisting operation.

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