Method for interchanging pulleys on tripod of crane

Abstract

The invention provides a method for interchanging pulleys on a crane tripod, which comprises the following steps of: arranging a sliding suspension cable on a variable-amplitude steel wire rope, fixedly connecting two ends of the sliding suspension cable with the left side and the right side of the top of the tripod respectively after crossing the variable-amplitude steel wire rope, and limiting the sliding suspension cable to move on the variable-amplitude steel wire rope by arranging a bandage; therefore, the chain block arranged on the sliding suspension cable is used for hoisting the pulley to be exchanged for disassembly, and the chain block is pulled through the traction rope, so that the pulley to be exchanged is moved through the sliding suspension cable, and the exchange of the pulleys on the left side and the right side of the top of the tripod is realized.

Description

Technical Field

[0001] The invention relates to the technical field of cranes, and in particular to a pulley interchange method on a crane tripod. Background Art

[0002] With the depletion of land resources, the direction of resource development has expanded to the ocean. Marine resources will dominate the world's resources in the future and become the focus of fierce competition among countries. To develop marine resources, advanced marine cranes are needed to transport goods and equipment. Cranes are widely used because of their small platform space, compact structure, large lifting capacity, and long lifting radius. For example, the patent document with Chinese application number 201821574159.4 and announcement date 2019.08.02 discloses a flat and special-shaped slewing platform crane, including a base, a slewing bearing, a slewing platform, a slewing drive device, a boom and a tripod. The slewing platform adopts parallel rib plate groups on both sides; the structural design of the front and rear centering rib plate groups is conducive to the dispersion of the slewing platform stress and can significantly improve the structural stability of the slewing platform. An axial hole is provided on the slewing platform, a shaft sleeve is provided in the axial hole, and the slewing drive device is arranged in the axial hole for easy maintenance and replacement. The tripod adopts two connection methods: welding and flange connection, which is convenient for assembly and disassembly and transportation.

[0003] The crane in the above document is equipped with a tripod, and a pulley is installed on the tripod, so that the wire rope of the winch can be connected to the boom after passing around the pulley of the tripod. However, in the process of winding the wire rope, it is found that the pulleys on both sides of the top of the tripod installed on the rotating platform are installed upside down. In this case, the pulleys need to be interchanged before the wire rope can be wound around the pulleys of the tripod. Since the pulley is about 100 meters above the ground, the cost of using a crane for operation is high, and due to the high height, the pulleys on both sides of the tripod cannot be easily replaced to ensure the safety of the operation. Summary of the invention

[0004] The object of the present invention is to provide a method for exchanging pulleys on a crane tripod, which utilizes a variable-length steel wire rope to achieve the ability to interchange pulleys on the tripod, is easy to operate and has low use cost.

[0005] To achieve the above object, a method for exchanging pulleys on a crane tripod comprises the following steps: S2 determines the length of the sliding suspension cable, keeps the luffing wire rope in a straight state, marks the luffing wire rope just above the pulley to be exchanged, and then changes the luffing wire rope from a straight state to a relaxed state; S3: Set straps on both sides of the mark, connect one end of the sliding cable to the lifting lug on the left side of the tripod top through a shackle, then pass the sliding cable through the mark between the straps and fix the sliding cable to the luffing wire rope at the mark through the shackle, then connect the other end of the sliding cable to the hand chain hoist, and connect the hand chain hoist to the lifting lug on the right side of the tripod top through the shackle; S4: a hand chain hoist is arranged on the sliding suspension cable, and a traction rope is installed on the hand chain hoist. Then, the sling is put on the pulley along the rope groove of the pulley and the sling is in a tightened state. The hand chain hoist on the sliding suspension cable is connected to the sling through a shackle. S5 moves the hand chain hoists on the sliding suspension cable to the top of the pulley to be exchanged, and then changes the luffing wire rope from a slack state to a straight state, and then controls the hand chain hoists on the sliding suspension cable to tighten the pulley to be exchanged, so that the pulling force of the hand chain hoists is equal to the gravity of the pulley to be exchanged; S6 removes the pulley, lifts the pulley off the pulley mounting plate through the hand hoist on the sliding suspension cable and the hand hoist installed on the platform guardrail, and fixes the pulley on the right side of the tripod top on the platform. Then pull the traction rope to move the pulley on the left side of the tripod top to the pulley mounting plate on the right side of the tripod top for installation. After the installation of the pulley on the right side of the tripod top is completed, pull the traction rope to move the pulley on the platform to the pulley mounting plate on the left side of the tripod top for installation, and complete the swap of the left and right pulleys on the tripod top.

[0006] The above arrangement is that the sliding suspension cable is passed over the steel wire rope and connected to both ends, and then an electric hoist is arranged at the lower end of the sliding suspension cable to realize the left and right side movement of the pulley, so that the pulley can be replaced by using the steel wire rope, which is low in cost, and the mark is set on the variable-length steel wire rope according to the length of the sliding suspension cable, so that after the variable-length steel wire rope is straightened, the sliding suspension cable fixed on the variable-length steel wire rope can be above the pulley to be exchanged, and then it is convenient to lift the pulley to be exchanged by the hand winch arranged on the sliding suspension cable, and the sliding suspension cable is fixed at the mark by arranging a lock buckle, and at the same time, a binding strap is arranged to limit the sliding suspension cable in the setting direction of the steel wire rope, so as to prevent the sliding suspension cable from sliding on the variable-length steel wire rope along the length direction of the variable-length steel wire rope, thereby ensuring the safety of the operation.

[0007] Furthermore, before step S2, the method further includes step S1 of presetting the maximum deformation of the sliding suspension cable fixed on the luffing wire rope in the vertical direction. Then, the maximum preload force of the sliding cable is calculated according to the weight P of the pulley to be exchanged and the span L of the sliding cable on the variable-length wire rope. ; After "and connecting the hand chain hoist to the lifting lug on the right side of the top of the tripod through the shackle" in step S3, the method further includes: making the pre-tightening force of the sliding suspension cable smaller than the maximum pre-tightening force S.

[0008] The above arrangement can make the preload force less than the maximum preload force S after the two ends of the sliding suspension cable are connected, so that after the pulley is hung on the lower end of the sliding suspension cable, the pulley can be pulled up to move upward, ensuring the reliability of pulling.

[0009] Furthermore, the sliding cable includes a left sliding cable and a right sliding cable. The left sliding cable is arranged above the left pulley at the top of the tripod, and is fixed to the left and right ears on the top of the tripod after passing through the mark, crossing the variable-length steel wire rope; the right sliding cable is arranged above the right pulley at the top of the tripod, and is fixed to the left and right ears on the top of the tripod after passing through the mark, crossing the variable-length steel wire rope.

[0010] The above arrangement facilitates the left pulley on the top of the tripod to slide to the right side of the top of the tripod through the left sliding cable after disassembly, and the right pulley on the top of the tripod to slide to the left side of the top of the tripod through the right sliding cable after disassembly.

[0011] Furthermore, the preload force is calculated in step S1 The calculation formula is as follows: , Where P is the weight of the pulley to be exchanged, g is the acceleration of gravity, L is the span of the sliding cable on the variable-length wire rope, is the angle between the sliding cable and the horizontal when no pulley is hung on the sliding cable. is the maximum deformation in the vertical direction when the sliding cable is hung on the pulley, and then the preload of the left sliding cable and the right sliding cable are calculated respectively.

[0012] The above settings make it easy to calculate the preload force of the sliding cable.

[0013] Furthermore, the length of the sliding cable in step S2 is the sum of the span l of the sliding cable on the luffing wire rope, the distance from the luffing wire rope to the left lug at the top of the tripod, and the distance from the luffing wire rope to the right lug at the top of the tripod.

[0014] The above arrangement facilitates the calculation of the length of the sliding suspension cable in advance, so that the sliding suspension cable can be installed and fixed on the left and right sides of the top of the tripod after crossing the luffing wire rope.

[0015] Furthermore, the step S4 also includes: A shackle is arranged at the lower end of the hand chain hoist, and the sling is connected to the shackle after being put through the pulley. The shackle is then driven upward by the hand chain hoist, thereby driving the sling from a loose state to a tightened state.

[0016] The above arrangement can tightly lock the pulley to be interchanged through the sling, thereby facilitating the movement of the pulley after disassembly and assembly.

[0017] Furthermore, the step S5 also includes: Move the hand hoist on the left sliding cable to above the pulley on the left side of the top of the tripod, and move the hand hoist on the right sliding cable to above the pulley on the right side of the top of the tripod. After the variable-length wire rope becomes straight, adjust the preload force of the left sliding cable and the right sliding cable to the preload force calculated in step S1 by the hand hoist connected to the left sliding cable and the hand hoist connected to the right sliding cable, respectively, so that the left sliding cable and the right sliding cable are in a taut state.

[0018] The above arrangement enables the pulley to move within a preset deformation amount, preventing the sliding suspension cable from deforming too much, thereby making it easier for the staff to move the hand chain hoist by pulling the traction rope.

[0019] Furthermore, the step S6 also includes: After removing the pulley on the right side of the tripod top, use the hand chain hoist on the right sliding cable to drive the pulley on the right side of the tripod top to move upward 800mm, and then use the hand chain hoist set on the platform guardrail on the right side of the tripod top to pull the pulley on the right side of the tripod top to move 550mm toward the platform, so that the pulley on the right side of the tripod top is separated from the pulley mounting plate on the right side of the tripod top and fixed on the platform; The hand chain hoist on the left sliding cable drives the pulley on the left side of the tripod top to move upward 800mm, and then the hand chain hoist set on the left platform guardrail of the tripod top pulls the knot set on the sling to make the pulley on the left side of the tripod top move 550mm toward the platform, so that the pulley on the left side of the tripod top is separated from the pulley mounting plate on the left side of the tripod top, and the traction rope is pulled to make the hand chain hoist on the left sliding cable drive the pulley on the left side of the tripod top to move a distance to the right and then stop, and release the hand chain hoist on the left platform guardrail of the tripod top, so that the pulley on the left side of the tripod top is only affected by the hand chain hoist on the left sliding cable in the vertical direction The pulling force is then pulled, and the traction rope is pulled to drive the pulley on the left side of the tripod top to move rightward to the front of the pulley mounting plate on the right side of the tripod top. The pulley on the left side of the tripod top is pulled toward the platform for a distance by another hand chain hoist arranged on the right platform guardrail of the tripod top. The traction rope is then pulled to drive the pulley on the left side of the tripod top to continue to move rightward to above the pulley mounting plate on the right side of the tripod top. Then, the other hand chain hoist on the right platform guardrail of the tripod top is released to make the pulley on the left side of the tripod top enter the pulley mounting plate on the right side of the tripod top. Finally, the pulley moved from the left side to the right side of the tripod top is installed. Then, the traction rope is pulled to drive the pulley on the right side of the tripod top to move left to the front of the pulley mounting plate on the left side of the tripod top by another hand chain hoist arranged on the left platform guardrail of the tripod top, and the pulley on the right side of the tripod top is pulled toward the platform for a distance, and then the traction rope is pulled to drive the pulley on the right side of the tripod top to continue to move left to above the pulley mounting plate on the left side of the tripod top, and then the other hand chain hoist on the left platform guardrail of the tripod top is released to make the pulley on the right side of the tripod top enter the pulley mounting plate on the left side of the tripod top, and finally the pulley moving from the right side of the tripod top to the left side is installed.

[0020] The above arrangement can prevent the left and right pulleys on the top of the tripod from colliding and becoming unable to interchange during movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0022] Figure 2 It is a schematic diagram of the pulley detaching from the pulley mounting plate in the present invention.

[0023] Figure 3 It is a schematic diagram of the connection between the sling and the hand chain hoist in the present invention.

[0024] Figure 4 It is a left side view of the present invention.

[0025] Figure 5 It is a right side view of the present invention.

[0026] Figure 6 The figure is a schematic diagram of the connection between the variable-length steel wire rope, the sliding suspension cable and the pulley frame in the present invention. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figures 1 to 5 As shown, a method for exchanging pulleys on a crane tripod comprises the following specific steps: S1 is the maximum deformation of the sliding cable fixed on the variable-length wire rope 1 in the vertical direction Then, the maximum preload force of the sliding cable is calculated according to the weight P of the pulley 2 to be exchanged and the span L of the sliding cable on the variable-length steel wire rope 1. , maximum preload The formula is as follows: , Where P is the weight of the pulley 2 to be exchanged, g is the acceleration of gravity, L is the span of the sliding cable on the variable-length wire rope 1, is the angle between the sliding cable and the horizontal when the pulley 2 is not hung on the sliding cable, It is the maximum deformation in the vertical direction when the sliding cable is hung on the pulley. In this embodiment, the sliding cable includes a left sliding cable 3 and a right sliding cable 4. Then, the preload forces of the left sliding cable 3 and the right sliding cable 4 are calculated respectively.

[0029] S2 determines the length of the sliding suspension cable. In the present embodiment, the length of the sliding suspension cable is the sum of the span L of the sliding suspension cable on the luffing wire rope 1, the distance from the luffing wire rope 1 to the left ear 5 at the top of the tripod, and the distance from the luffing wire rope 1 to the right ear 6 at the top of the tripod. The luffing wire rope 1 is kept in a straightened state, and a mark is made on the luffing wire rope 1 directly above the pulley 2 to be interchanged. Then, the luffing wire rope 1 is changed from the straightened state to the relaxed state. In the present embodiment, the tension state of the luffing wire rope 1 is controlled by the luffing controller.

[0030] S3 sets straps 7 on both sides of the mark, connects one end of the left sliding cable 3 to the left lifting ear 5 at the top of the tripod through the shackle 8, then passes the left sliding cable 3 through the mark between the straps 7 and fixes the left sliding cable 3 to the variable-length wire rope 1 at the mark through the shackle 8, then connects the other end of the left sliding cable 3 to the hand chain hoist 9, and connects the hand chain hoist 9 to the right lifting ear 6 at the top of the tripod through the shackle 8, and makes the preload force of the sliding cable not exceed the maximum preload force, so that the left sliding cable 3 is set above the pulley 2 on the left side of the top of the tripod; One end of the right sliding cable 4 is connected to the left ear 5 at the top of the tripod through the shackle 8, and then the right sliding cable 4 is passed through the mark between the straps 7 and fixed to the variable-length wire rope 1 at the mark through the shackle 8, and then the other end of the right sliding cable 4 is connected to the hand winch 9, and the hand winch 9 is connected to the right ear 6 at the top of the tripod through the shackle 8, so that the right sliding cable 4 is set above the pulley 2 on the right side of the top of the tripod.

[0031] S4 respectively arranges a hand winch 9 on the left sliding cable 3 and the right sliding cable 4, and arranges a shackle 8 at the lower end of the hand winch 9, then installs a traction rope 10 on the hand winch 9, and then puts the sling 71 around the pulley 2 along the rope groove of the pulley 2. After the sling 71 is put around the pulley 2, it is connected to the shackle 8, and the shackle 8 is driven to move upward by the hand winch 9, thereby driving the sling 71 from a relaxed state to a tightened state.

[0032] S5 moves the hand chain hoist 9 on the left sliding cable 3 to above the pulley 2 on the left side of the top of the tripod, moves the hand chain hoist 9 on the right sliding cable 4 to above the pulley 2 on the right side of the top of the tripod, and then changes the luffing wire rope 1 from a relaxed state to a stretched state. After the luffing wire rope 1 changes to a stretched state, the pre-tightening force of the left sliding cable 3 and the right sliding cable 4 is adjusted to the pre-tightening force calculated in step S1 by the hand chain hoist 9 connected to the left sliding cable 3 and the hand chain hoist 9 connected to the right sliding cable 4, respectively, so that the left sliding cable 3 and the right sliding cable 4 are in a taut state, and then the hand chain hoists 9 on the left sliding cable 3 and the right sliding cable 4 are respectively controlled to tighten the pulley 2 to be interchanged, so that the pulling force of the hand chain hoist 9 is equal to the gravity of the pulley 2 to be interchanged; S6 removes the stop plates and pins of the pulleys 2 on the left and right sides of the tripod top respectively. After removing the pulley 2 on the right side of the tripod top, the pulley 2 on the right side of the tripod top is driven to move upward 800 mm by the hand chain hoist 9 on the right sliding suspension cable 4. Then, the pulley 2 on the right side of the tripod top is pulled 550 mm toward the platform by the hand chain hoist set on the platform guardrail 11 on the right side of the tripod top, so that the pulley 2 on the right side of the tripod top is separated from the pulley mounting plate on the right side of the tripod top and fixed on the platform. The hand chain hoist 9 on the left sliding suspension cable 3 drives the pulley 2 on the left side of the tripod top to move upward 800mm, and then the hand chain hoist 9 set on the left platform guardrail 11 of the tripod top pulls the knot set on the sling 71 to make the pulley 2 on the left side of the tripod top move 550mm in the direction of the platform, so that the pulley 2 on the left side of the tripod top is separated from the pulley mounting plate on the left side of the tripod top, and the traction rope 10 is pulled to make the hand chain hoist 9 on the left sliding suspension cable 3 drive the pulley 2 on the left side of the tripod top to move a distance to the right and then stop, and release the hand chain hoist 9 on the left platform guardrail of the tripod top, so that the pulley 2 on the left side of the tripod top is only controlled by the hand chain hoist 9 on the left sliding suspension cable 3. The pulling force in the vertical direction is then pulled by pulling the traction rope 10 to drive the pulley 2 on the left side of the tripod top to move rightward to the front of the pulley mounting plate on the right side of the tripod top. The pulley 2 on the left side of the tripod top is pulled toward the platform for a distance by another hand chain hoist arranged on the right platform guardrail of the tripod top. Then the traction rope 10 is pulled to drive the pulley 2 on the left side of the tripod top to continue to move rightward to above the pulley mounting plate on the right side of the tripod top. Then, the other hand chain hoist on the right platform guardrail of the tripod top is released to make the pulley 2 on the left side of the tripod top enter the pulley mounting plate on the right side of the tripod top. Finally, the pulley 2 moved from the left side to the right side of the tripod top is installed. After the pulley 2 on the left side of the tripod top is moved to the pulley mounting plate on the right side of the tripod top and installed, the traction rope 10 is pulled to make the hand chain hoist 9 on the right sliding suspension cable 4 drive the pulley 2 on the right side of the tripod top to move to the left for a distance and then stop, and the hand chain hoist on the right platform guardrail 11 of the tripod top is released, so that the pulley 2 on the right side of the tripod top is only subjected to the vertical pulling force of the hand chain hoist 9 on the right sliding suspension cable 4, and then the traction rope 10 is pulled to drive the pulley 2 on the right side of the tripod top to move to the left to the front of the pulley mounting plate on the left side of the tripod top, The pulley on the right side of the tripod top is pulled toward the platform for a distance by another hand chain hoist arranged on the left platform guardrail of the tripod top, and then the traction rope 10 is pulled to drive the pulley 2 on the right side of the tripod top to continue to move to the left to above the pulley mounting plate on the left side of the tripod top, and then the other hand chain hoist on the left platform guardrail of the tripod top is released to make the pulley on the right side of the tripod top enter the pulley mounting plate on the left side of the tripod top, and finally the pulley moved from the right side of the tripod top to the left side is installed, thereby completing the interchange of the left and right pulleys on the tripod top.

[0033] The working principle of the present invention is as follows: a sliding suspension cable is arranged on the luffing steel wire rope, and the two ends of the sliding suspension cable are made to cross the luffing steel wire rope and then be fixedly connected to the left and right sides of the top of the tripod respectively; a binding belt is arranged to limit the movement of the sliding suspension cable on the luffing steel wire rope, so that the pulley to be interchanged is lifted by a hand winch arranged on the sliding suspension cable for disassembly, and the hand winch is pulled by a traction rope to move the pulley to be interchanged through the sliding suspension cable, thereby realizing the interchange of the pulleys on the left and right sides of the top of the tripod.

Claims

1. A method for exchanging pulleys on a crane tripod, characterized in that: The following steps are involved: S2 determines the length of the sliding suspension cable, keeps the luffing wire rope in a straight state, marks the luffing wire rope just above the pulley to be exchanged, and then changes the luffing wire rope from a straight state to a relaxed state; S3: Set straps on both sides of the mark, connect one end of the sliding cable to the lifting lug on the left side of the tripod top through a shackle, then pass the sliding cable through the mark between the straps and fix the sliding cable to the luffing wire rope at the mark through the shackle, then connect the other end of the sliding cable to the hand chain hoist, and connect the hand chain hoist to the lifting lug on the right side of the tripod top through the shackle; S4: a hand chain hoist is arranged on the sliding suspension cable, and a traction rope is installed on the hand chain hoist. Then, the sling is put on the pulley along the rope groove of the pulley and the sling is in a tightened state. The hand chain hoist on the sliding suspension cable is connected to the sling through a shackle. S5 moves the hand chain hoists on the sliding suspension cable to the top of the pulley to be exchanged, and then changes the luffing wire rope from a slack state to a straight state, and then controls the hand chain hoists on the sliding suspension cable to tighten the pulley to be exchanged, so that the pulling force of the hand chain hoists is equal to the gravity of the pulley to be exchanged; S6 removes the pulley, lifts the pulley off the pulley mounting plate through the hand hoist on the sliding suspension cable and the hand hoist installed on the platform guardrail, and fixes the pulley on the right side of the tripod top on the platform. Then pull the traction rope to move the pulley on the left side of the tripod top to the pulley mounting plate on the right side of the tripod top for installation. After the installation of the pulley on the right side of the tripod top is completed, pull the traction rope to move the pulley on the platform to the pulley mounting plate on the left side of the tripod top for installation, and complete the swap of the left and right pulleys on the tripod top.

2. A method for exchanging pulleys on a crane tripod according to claim 1, characterized in that: Before step S2, step S1 is also included to preset the maximum deformation of the sliding suspension cable fixed on the variable-length steel wire rope in the vertical direction. Then, the maximum preload force of the sliding cable is calculated according to the weight P of the pulley to be exchanged and the span L of the sliding cable on the variable-length wire rope. ; After "and connecting the hand chain hoist to the lifting ear on the right side of the top of the tripod through the shackle" in step S3, the method further includes: making the pre-tightening force of the sliding suspension cable smaller than the maximum pre-tightening force S.

3. A method for exchanging pulleys on a crane tripod according to claim 1, characterized in that: The sliding suspension cable includes a left sliding suspension cable and a right sliding suspension cable. The left sliding suspension cable is arranged above the left pulley on the top of the tripod, and is fixed to the left and right ears on the top of the tripod after passing through the mark, crossing the luffing wire rope, and then being fixed to the left and right ears on the top of the tripod; the right sliding suspension cable is arranged above the right pulley on the top of the tripod, and is fixed to the left and right ears on the top of the tripod after passing through the mark, crossing the luffing wire rope, and then being fixed to the left and right ears on the top of the tripod.

4. A method for exchanging pulleys on a crane tripod according to claim 2, characterized in that: The preload force is calculated in step S1 The calculation formula is as follows: ， Where P is the weight of the pulley to be exchanged, g is the acceleration of gravity, L is the span of the sliding cable on the variable-length wire rope, is the angle between the sliding cable and the horizontal when no pulley is hung on the sliding cable. is the maximum deformation in the vertical direction when the sliding cable is hung on the pulley, and then the preload of the left sliding cable and the right sliding cable are calculated respectively.

5. The method for exchanging pulleys on a crane tripod according to claim 1, characterized in that: The length of the sliding cable in step S2 is the sum of the span l of the sliding cable on the luffing wire rope, the distance from the luffing wire rope to the left lug at the top of the tripod, and the distance from the luffing wire rope to the right lug at the top of the tripod.

6. A method for exchanging pulleys on a crane tripod according to claim 1, characterized in that: The step S4 also includes: A shackle is arranged at the lower end of the hand chain hoist, and the sling is connected to the shackle after being put through the pulley. The shackle is then driven upward by the hand chain hoist, thereby driving the sling from a loose state to a tightened state.

7. A method for exchanging pulleys on a crane tripod according to claim 1, characterized in that: The step S5 also includes: Move the hand hoist on the left sliding cable to above the pulley on the left side of the top of the tripod, and move the hand hoist on the right sliding cable to above the pulley on the right side of the top of the tripod. After the variable-length wire rope becomes straight, adjust the preload force of the left sliding cable and the right sliding cable to the preload force calculated in step S1 by the hand hoist connected to the left sliding cable and the hand hoist connected to the right sliding cable, respectively, so that the left sliding cable and the right sliding cable are in a taut state.

8. A method for exchanging pulleys on a crane tripod according to claim 1, characterized in that: The step S6 also includes: After removing the pulley on the right side of the tripod top, use the hand chain hoist on the right sliding cable to drive the pulley on the right side of the tripod top to move upward 800mm, and then use the hand chain hoist set on the platform guardrail on the right side of the tripod top to pull the pulley on the right side of the tripod top to move 550mm toward the platform, so that the pulley on the right side of the tripod top is separated from the pulley mounting plate on the right side of the tripod top and fixed on the platform; The hand chain hoist on the left sliding cable drives the pulley on the left side of the tripod top to move upward 800mm, and then the hand chain hoist set on the left platform guardrail of the tripod top pulls the knot set on the sling to make the pulley on the left side of the tripod top move 550mm toward the platform, so that the pulley on the left side of the tripod top is separated from the pulley mounting plate on the left side of the tripod top, and the traction rope is pulled to make the hand chain hoist on the left sliding cable drive the pulley on the left side of the tripod top to move a distance to the right and then stop, and release the hand chain hoist on the left platform guardrail of the tripod top, so that the pulley on the left side of the tripod top is only affected by the hand chain hoist on the left sliding cable in the vertical direction The pulling force is then pulled, and the traction rope is pulled to drive the pulley on the left side of the tripod top to move rightward to the front of the pulley mounting plate on the right side of the tripod top. The pulley on the left side of the tripod top is pulled toward the platform for a distance by another hand chain hoist arranged on the right platform guardrail of the tripod top. The traction rope is then pulled to drive the pulley on the left side of the tripod top to continue to move rightward to above the pulley mounting plate on the right side of the tripod top. Then, the other hand chain hoist on the right platform guardrail of the tripod top is released to make the pulley on the left side of the tripod top enter the pulley mounting plate on the right side of the tripod top. Finally, the pulley moved from the left side to the right side of the tripod top is installed. Then, the traction rope is pulled to drive the pulley on the right side of the tripod top to move left to the front of the pulley mounting plate on the left side of the tripod top by another hand chain hoist arranged on the left platform guardrail of the tripod top, and the pulley on the right side of the tripod top is pulled toward the platform for a distance, and then the traction rope is pulled to drive the pulley on the right side of the tripod top to continue to move left to above the pulley mounting plate on the left side of the tripod top, and then the other hand chain hoist on the left platform guardrail of the tripod top is released to make the pulley on the right side of the tripod top enter the pulley mounting plate on the left side of the tripod top, and finally the pulley moving from the right side of the tripod top to the left side is installed.

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