Maintenance platform position conversion device and use method

Abstract

The present invention relates to the field of ship technology, and in particular to a maintenance platform position conversion device and a method of using the same, wherein the maintenance platform position conversion device comprises a vertical steel pipe assembly; a first crossbeam and a second crossbeam, wherein the first crossbeam and the second crossbeam are arranged at intervals on a gantry cross wall plate in a vertical direction, and the vertical steel pipe assembly is sleeved on the first crossbeam and the second crossbeam; a maintenance platform fixing assembly, wherein the maintenance platform fixing assembly is fixedly connected to the maintenance platform, and the maintenance platform fixing assembly is sleeved on the vertical steel pipe assembly; a first drive assembly, wherein the first drive assembly is arranged on the gantry cross wall plate; a second drive assembly, wherein the second drive assembly is arranged on the gantry cross wall plate; and a third drive assembly, wherein the third drive assembly is arranged on the vertical steel pipe assembly. The present invention can safely and efficiently complete the position conversion of the maintenance platform under complex working conditions on water.

Description

Technical Field

[0001] The present invention relates to the technical field of ships, and in particular to a maintenance platform position conversion device and a use method thereof. Background Art

[0002] The tail of the cutter suction dredger is equipped with a multifunctional maintenance platform (to facilitate the maintenance of the cutter beam under water conditions). The position of the maintenance platform needs to be adjusted according to the different maintenance parts to meet the needs of maintenance work. The existing technology completely relies on the built-in crane on the gantry of the cutter suction dredger to lift the maintenance platform and then change its position. The maintenance platform has a large volume, surface area and weight. Under water conditions, the operation process of completely relying on the ship's own crane to change the position of the maintenance platform has a high risk factor, low work efficiency, and poor alignment accuracy of the flange bolt holes. The main reasons are as follows:

[0003] 1. Under working conditions on water, the ship itself is prone to sway with wind and waves;

[0004] 2. The surface area of ​​the maintenance platform is large, which is easily affected by wind and causes a certain amount of shaking;

[0005] 3. The inertia of the maintenance platform when fully hoisted by the ship crane will cause a certain amount of shaking;

[0006] 4. There is no auxiliary device to limit the position of the maintenance platform during the position conversion process, which poses a great potential risk to the personal safety of the operator. In addition, the bolt hole alignment accuracy of the flange plate on the maintenance platform is poor, resulting in a long installation time for the fixing bolts.

[0007] Therefore, a maintenance platform position conversion device and a use method are needed to solve the above problems. Summary of the invention

[0008] The object of the present invention is to provide a maintenance platform position conversion device and a use method, which can safely and efficiently complete the position conversion work of the maintenance platform under complex working conditions on water.

[0009] To achieve this object, the present invention adopts the following technical solutions:

[0010] The maintenance platform position conversion device comprises:

[0011] Vertical steel pipe assembly;

[0012] A first crossbeam and a second crossbeam, wherein the first crossbeam and the second crossbeam are arranged on the cross wall plate of the gantry frame at intervals in the vertical direction, and two ends of the vertical steel pipe assembly are sleeved on the first crossbeam and the second crossbeam;

[0013] A maintenance platform fixing assembly, the maintenance platform fixing assembly is fixedly connected to the maintenance platform, and the maintenance platform fixing assembly is sleeved on the vertical steel pipe assembly;

[0014] A first driving assembly, the first driving assembly is arranged on the gantry cross wall plate and is drivingly connected to one end of the vertical steel pipe assembly sleeved on the first cross beam;

[0015] A second driving assembly, the second driving assembly is arranged on the horizontal wall plate of the gantry and is drivingly connected to one end of the vertical steel pipe assembly sleeved on the second crossbeam;

[0016] The third driving assembly is arranged on the vertical steel pipe assembly and is transmission-connected with the maintenance platform fixing assembly, and can push the maintenance platform fixing assembly to move in a vertical direction.

[0017] Furthermore, the vertical steel pipe assembly includes a vertical pipe and two transverse pipes, the two transverse pipes are arranged at both ends of the vertical pipe, one of the transverse pipes is sleeved on the first cross beam, the other transverse pipe is sleeved on the second cross beam, and the third drive assembly is arranged on the transverse pipes.

[0018] Furthermore, the maintenance platform fixing assembly includes a sleeve and a connecting flange plate connected to each other, the sleeve is sleeved on the vertical pipe, the connecting flange plate is fixedly connected to the maintenance platform, and the third driving assembly is drivingly connected to the sleeve.

[0019] Furthermore, the first driving assembly includes a first hydraulic cylinder and a first push plate, the first hydraulic cylinder is arranged on the cross wall plate of the gantry, the piston rod of the first hydraulic cylinder is connected to the first push plate, and the first push plate is arranged on the transverse tube sleeved on the first cross beam.

[0020] Furthermore, the second driving assembly includes a second hydraulic cylinder and a second push plate, the second hydraulic cylinder is arranged on the gantry cross wall plate, the piston rod of the second hydraulic cylinder is connected to the second push plate, and the second push plate is arranged on the transverse tube sleeved on the second cross beam.

[0021] Further, the third driving assembly includes a third hydraulic cylinder and a third push plate, the third hydraulic cylinder is arranged on the transverse tube, the piston rod of the third hydraulic cylinder is connected to the third push plate, and the third push plate is arranged on the sleeve.

[0022] Furthermore, a first limit plate is provided at one end of the first cross beam away from the cross wall plate of the gantry, and a second limit plate is provided at one end of the second cross beam away from the cross wall plate of the gantry.

[0023] Furthermore, a first reinforcing rib is provided between one end of the first cross beam away from the gantry cross wall plate and the gantry cross wall plate, and a second reinforcing rib is provided between one end of the second cross beam away from the gantry cross wall plate and the gantry cross wall plate.

[0024] Furthermore, both the first crossbeam and the second crossbeam are provided with limit alarm devices.

[0025] The method for using the maintenance platform position conversion device, using the maintenance platform position conversion device as described above, comprises the following steps:

[0026] S1. Fixing the maintenance platform fixing assembly to the maintenance platform;

[0027] S2. Using the vessel's own crane to tie and lift the maintenance platform;

[0028] S3, starting the first drive assembly and the second drive assembly to drive the maintenance platform fixing assembly to move, starting the third drive assembly to drive the maintenance platform fixing assembly to move in the vertical direction until the first positioning hole on the maintenance platform fixing assembly is aligned with the second positioning hole of the base flange provided on the gantry cross wall plate;

[0029] S4. Insert positioning bolts into the first positioning hole and the second positioning hole to complete the positioning and installation of the maintenance platform.

[0030] Beneficial effects of the present invention:

[0031] A maintenance platform position conversion device provided by the present invention has a vertical steel pipe assembly arranged between a first crossbeam and a second crossbeam, a maintenance platform fixing assembly sleeved on the vertical steel pipe assembly, the maintenance platform fixing assembly is fixedly connected to the maintenance platform, the maintenance platform fixing assembly can be pushed by the first drive assembly and the second drive assembly to push the maintenance platform to move in the lateral direction, and the maintenance platform fixing assembly can be pushed by the third drive assembly to push the maintenance platform to move in the vertical direction, thereby adjusting the position of the maintenance platform and safely and efficiently completing the position conversion of the maintenance platform under complex working conditions on the water.

[0032] The present invention provides a method for using a maintenance platform position conversion device. By using the maintenance platform position conversion device as described above, the position conversion work of the maintenance platform can be completed safely and efficiently under complex working conditions on water. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of a maintenance platform position conversion device of the present invention;

[0034] Figure 2It is a schematic diagram of a base flange in a maintenance platform position conversion device of the present invention;

[0035] Figure 3 It is a schematic diagram of the cooperation between the base flange and the connecting flange plate in a maintenance platform position conversion device of the present invention;

[0036] Figure 4 It is a schematic diagram of a base flange and a connecting flange plate in a maintenance platform position conversion device of the present invention.

[0037] In the figure:

[0038] 1. Vertical steel pipe assembly; 11. Vertical pipe; 12. Horizontal pipe; 13. Third limit alarm; 2. First crossbeam; 21. First limit alarm; 22. First limit plate; 23. First reinforcing rib; 3. Second crossbeam; 31. Second limit alarm; 32. Second limit plate; 33. Second reinforcing rib; 4. First drive assembly; 41. First hydraulic cylinder; 42. First push plate; 5. Second drive assembly; 51. Second hydraulic cylinder; 52. Second push plate; 6. Maintenance platform fixing assembly; 61. Casing; 62. Connecting flange plate; 7. Third drive assembly; 71. Third hydraulic cylinder; 72. Third push plate; 8. Base flange; 9. Cone head positioning bolt; 91. Fixing pin. DETAILED DESCRIPTION

[0039] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and implementation methods. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all of them.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0042] When the maintenance platform is changing position, in order to be able to complete the position change of the maintenance platform safely and efficiently under complex working conditions on the water, such as Figure 1-Figure 4 As shown, the present invention provides a maintenance platform position conversion device, which comprises a vertical steel pipe assembly 1, a first cross beam 2, a second cross beam 3, a maintenance platform fixing assembly 6, a first drive assembly 4, a second drive assembly 5 and a third drive assembly 7.

[0043] Among them, the first crossbeam 2 and the second crossbeam 3 are arranged at intervals along the vertical direction on the gantry cross wall plate, and the two ends of the vertical steel pipe assembly 1 are sleeved on the first crossbeam 2 and the second crossbeam 3; the maintenance platform fixing assembly 6 is fixedly connected to the maintenance platform, and the maintenance platform fixing assembly 6 is sleeved on the vertical steel pipe assembly 1; the first driving assembly 4 is arranged on the gantry cross wall plate, and is transmission connected to one end of the vertical steel pipe assembly 1 sleeved on the first crossbeam 2; the second driving assembly 5 is arranged on the gantry cross wall plate, and is transmission connected to one end of the vertical steel pipe assembly 1 sleeved on the second crossbeam 3; the third driving assembly 7 is arranged on the vertical steel pipe assembly 1, and is transmission connected to the maintenance platform fixing assembly 6, and can push the maintenance platform fixing assembly 6 to move in the vertical direction.

[0044] The first driving assembly 4 and the second driving assembly 5 can push the maintenance platform fixing assembly 6 to push the maintenance platform to move in the lateral direction. The third driving assembly 7 can push the maintenance platform fixing assembly 6 to push the maintenance platform to move in the vertical direction, thereby adjusting the position of the maintenance platform and safely and efficiently completing the position conversion of the maintenance platform under complex working conditions on the water.

[0045] Furthermore, in this embodiment, in order to ensure the smooth movement of the maintenance platform, two groups of maintenance platform position conversion devices are arranged at intervals on the gantry cross wall plate, and the maintenance platform can be pushed to shift by the two groups of maintenance platform position conversion devices.

[0046] Furthermore, the vertical steel pipe assembly 1 includes a vertical pipe 11 and two transverse pipes 12, the two transverse pipes 12 are fixedly arranged at both ends of the vertical pipe 11, one of the transverse pipes 12 is sleeved on the first crossbeam 2, the other transverse pipe 12 is sleeved on the second crossbeam 3, and the third driving assembly 7 is arranged on the transverse pipe 12. The vertical pipe 11 can be driven to move in the transverse direction by the first driving assembly 4 and the second driving assembly 5, so as to realize the transverse movement of the maintenance platform. The above method ensures reliable movement and simple structure.

[0047] Furthermore, the maintenance platform fixing assembly 6 includes a sleeve 61 and a connecting flange plate 62 connected to each other, the sleeve 61 is sleeved on the vertical pipe 11, the connecting flange plate 62 is fixedly connected to the maintenance platform, and the third driving assembly 7 is drivingly connected to the sleeve 61. The sleeve 61 is driven by the third driving assembly 7, thereby driving the maintenance platform to move in the vertical direction through the connecting flange plate 62. The above method has a simple structure and ensures reliable movement.

[0048] Furthermore, the first driving assembly 4 includes a first hydraulic cylinder 41 and a first push plate 42. The first hydraulic cylinder 41 is arranged on the gantry cross wall plate, the piston rod of the first hydraulic cylinder 41 is connected to the first push plate 42, and the first push plate 42 is fixedly arranged on the transverse tube 12 sleeved on the first cross beam 2. The vertical steel pipe assembly 1 can be pushed to move by the first hydraulic cylinder 41 pushing the first push plate 42, thereby driving the maintenance platform to move.

[0049] Furthermore, the second driving assembly 5 includes a second hydraulic cylinder 51 and a second push plate 52. The second hydraulic cylinder 51 is arranged on the gantry horizontal wall plate. The piston rod of the second hydraulic cylinder 51 is connected to the second push plate 52. The second push plate 52 is arranged on the horizontal tube 12 sleeved on the second crossbeam 3. The second hydraulic cylinder 51 pushes the second push plate 52 to push the vertical steel pipe assembly 1 to move, thereby driving the maintenance platform to move. The first hydraulic cylinder 41 and the second hydraulic cylinder 51 cooperate with each other to realize the lateral movement of the maintenance platform.

[0050] Further, the third driving assembly 7 includes a third hydraulic cylinder 71 and a third push plate 72. The third hydraulic cylinder 71 is arranged on the transverse tube 12. The piston rod of the third hydraulic cylinder 71 is connected to the third push plate 72. The third push plate 72 is arranged on the sleeve 61. The third hydraulic cylinder 71 pushes the third push plate 72 to push the sleeve 61 to move in the vertical direction, thereby driving the maintenance platform to move.

[0051] Furthermore, a first limit plate 22 is fixedly provided at one end of the first cross beam 2 away from the cross wall of the gantry, and a second limit plate 32 is fixedly provided at one end of the second cross beam 3 away from the cross wall of the gantry. The first limit plate 22 and the second limit plate 32 are provided to form a mechanical hard limit, thereby ensuring that the first hydraulic cylinder 41 and the second hydraulic cylinder 51 will not exceed the range of motion when pushing the vertical steel pipe assembly 1 to move.

[0052] Furthermore, a first reinforcing rib 23 is fixedly arranged between one end of the first crossbeam 2 away from the cross wall plate of the gantry frame and the cross wall plate of the gantry frame, and a second reinforcing rib 33 is fixedly arranged between one end of the second crossbeam 3 away from the cross wall plate of the gantry frame and the cross wall plate of the gantry frame. By providing the first reinforcing rib 23 and the second reinforcing rib 33, the strength of the first crossbeam 2 and the second crossbeam 3 can be strengthened to ensure that the first crossbeam 2 and the second crossbeam 3 meet the requirements of use. In order to further improve the strength of the first crossbeam 2 and the second crossbeam 3, in this embodiment, a plurality of first reinforcing ribs 23 and second reinforcing ribs 33 are provided.

[0053] Furthermore, both the first cross beam 2 and the second cross beam 3 are provided with limit alarm devices. Specifically, two first limit alarms 21 are arranged at intervals on the first cross beam 2, and two second limit alarms 31 are arranged at intervals on the second cross beam 3. The two first limit alarms 21 and the two second limit alarms 31 are used to softly limit the movement of the transverse tube 12, thereby improving the safety of the displacement of the maintenance platform.

[0054] Furthermore, two third limit alarms 13 are arranged at intervals on the vertical pipe 11 to perform soft limit on the movement of the sleeve 61, thereby improving the safety of the displacement of the maintenance platform.

[0055] like Figure 4 As shown, further, a slope that matches each other is processed on the side of the connecting flange plate 62 away from the sleeve 61 and the base flange 8 to ensure that the connecting flange plate 62 smoothly transitions during the descending process to prevent right-angle contact with the base flange 8 and jamming. In this embodiment, the slope has an inclination angle of 45°±5°.

[0056] The maintenance platform position conversion device has the following advantages:

[0057] 1. With the cooperation of the ship crane, the maintenance platform can realize safe, accurate and efficient position conversion under complex working conditions on water;

[0058] 2. The maintenance platform is constrained by the maintenance platform position conversion device during the position conversion process, and its movement range and shaking amplitude are greatly reduced, and the safety and efficiency are greatly improved;

[0059] 3. During the position conversion process, the left and right sides of the maintenance platform are symmetrically loaded and moved at the same time, with balanced force and smooth movement;

[0060] 4. Most of the work of the maintenance platform during position conversion is achieved through automation technology, with high automation, low labor intensity and high safety factor;

[0061] 5. A limit alarm device is added to the maintenance platform during the position conversion process, which improves the accuracy and convenience of the constructor's judgment of the maintenance platform conversion position;

[0062] 6. The construction efficiency of locating the bolt holes between the connecting flange plate 62 and the base flange 8 and installing all the fixing bolts is improved.

[0063] This embodiment also provides a method for using the maintenance platform position conversion device, using the maintenance platform position conversion device as above, including the following steps:

[0064] S1, fixedly connecting the maintenance platform fixing assembly 6 to the maintenance platform;

[0065] S2. Use the ship's own crane to tie and lift the maintenance platform to keep the center of gravity of the maintenance platform balanced;

[0066] S3, start the first drive assembly 4 and the second drive assembly 5 to drive the maintenance platform fixing assembly 6 to move, start the third drive assembly 7 to drive the maintenance platform fixing assembly 6 to move in the vertical direction until the first positioning hole on the maintenance platform fixing assembly 6 is opposite to the second positioning hole of the base flange 8 provided on the gantry cross wall plate, when the first positioning hole and the second positioning hole deviate from each other, the corresponding drive assembly can be controlled separately to move to perform local position correction;

[0067] S4. Insert the positioning bolts into the first positioning hole and the second positioning hole to complete the positioning and installation of the maintenance platform.

[0068] Specifically, in step S4, the cone-head positioning bolts 9 are used to efficiently and accurately position the positioning holes between the connecting flange plate 62 and the base flange 8 diagonally using a grouped diagonal positioning method.

[0069] After completing the positioning of the cone head positioning bolt 9, insert the fixing pin 91 into the fixing pin 91 hole in time and open its legs to prevent it from falling off. Complete the installation of all other bolts connecting the flange plate 62 and the base flange 8, and tighten the nuts manually. Pull out the fixing pin 91 of the cone head positioning bolt 9 and remove the cone head positioning bolt 9. Complete the installation of the bolts between the last connecting flange plate 62 and the base flange 8, and tighten the nuts manually. The electronic control operation puts the first hydraulic cylinder 41, the second hydraulic cylinder 51 and the third hydraulic cylinder 71 in a non-stressed state. Then, use a standard kilogram wrench to tighten the nuts of all the fixing bolts between the connecting flange plate 62 and the base flange 8 in accordance with relevant requirements. Finally, release the ship's own crane from the binding and lifting operations of the maintenance platform to complete the conversion of the maintenance platform from the first working position to the second working position.

[0070] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A ship maintenance platform position conversion device, characterized in that: include: Vertical steel pipe assembly (1); A first crossbeam (2) and a second crossbeam (3), wherein the first crossbeam (2) and the second crossbeam (3) are arranged on the cross wall plate of the gantry frame at intervals in the vertical direction, and both ends of the vertical steel pipe assembly (1) are sleeved on the first crossbeam (2) and the second crossbeam (3); A maintenance platform fixing assembly (6), wherein the maintenance platform fixing assembly (6) is fixedly connected to the maintenance platform, and the maintenance platform fixing assembly (6) is sleeved on the vertical steel pipe assembly (1); A first driving assembly (4), the first driving assembly (4) being arranged on the gantry cross wall plate and being drivingly connected to one end of the vertical steel pipe assembly (1) sleeved on the first cross beam (2); A second driving assembly (5), the second driving assembly (5) being arranged on the horizontal wall plate of the gantry and being drivingly connected to one end of the vertical steel pipe assembly (1) sleeved on the second horizontal beam (3); a third driving assembly (7), the third driving assembly (7) being arranged on the vertical steel pipe assembly (1) and being in driving connection with the maintenance platform fixing assembly (6), and being capable of pushing the maintenance platform fixing assembly (6) to move in a vertical direction; the first driving assembly (4), the second driving assembly (5) and the third driving assembly (7) driving the maintenance platform fixing assembly (6) to move until a first positioning hole on the maintenance platform fixing assembly (6) is aligned with a second positioning hole of a base flange (8) arranged on the horizontal wall plate of the gantry; The vertical steel pipe assembly (1) comprises a vertical pipe (11) and two transverse pipes (12), wherein the two transverse pipes (12) are arranged at both ends of the vertical pipe (11), wherein one of the transverse pipes (12) is sleeved on the first transverse beam (2), wherein the other transverse pipe (12) is sleeved on the second transverse beam (3), and the third driving assembly (7) is arranged on the transverse pipes (12); The maintenance platform fixing assembly (6) comprises a sleeve (61) and a connecting flange plate (62) which are connected to each other, the sleeve (61) is sleeved on the vertical pipe (11), the connecting flange plate (62) is fixedly connected to the maintenance platform, and the third driving assembly (7) is drivingly connected to the sleeve (61).

2. The ship maintenance platform position conversion device according to claim 1, characterized in that: The first driving assembly (4) comprises a first hydraulic cylinder (41) and a first push plate (42); the first hydraulic cylinder (41) is arranged on the gantry cross wall plate; the piston rod of the first hydraulic cylinder (41) is connected to the first push plate (42); the first push plate (42) is arranged on the transverse tube (12) sleeved on the first cross beam (2).

3. The ship maintenance platform position conversion device according to claim 1, characterized in that: The second driving assembly (5) comprises a second hydraulic cylinder (51) and a second push plate (52); the second hydraulic cylinder (51) is arranged on the cross wall plate of the gantry; the piston rod of the second hydraulic cylinder (51) is connected to the second push plate (52); and the second push plate (52) is arranged on the transverse tube (12) sleeved on the second cross beam (3).

4. The ship maintenance platform position conversion device according to claim 1, characterized in that: The third driving assembly (7) comprises a third hydraulic cylinder (71) and a third push plate (72); the third hydraulic cylinder (71) is arranged on the transverse tube (12); the piston rod of the third hydraulic cylinder (71) is connected to the third push plate (72); and the third push plate (72) is arranged on the sleeve (61).

5. The ship maintenance platform position conversion device according to claim 1, characterized in that: A first limit plate (22) is provided at one end of the first cross beam (2) away from the cross wall plate of the gantry, and a second limit plate (32) is provided at one end of the second cross beam (3) away from the cross wall plate of the gantry.

6. The ship maintenance platform position conversion device according to claim 1, characterized in that: A first reinforcing rib (23) is provided between one end of the first cross beam (2) away from the gantry cross wall plate and the gantry cross wall plate, and a second reinforcing rib (33) is provided between one end of the second cross beam (3) away from the gantry cross wall plate and the gantry cross wall plate.

7. The ship maintenance platform position conversion device according to claim 1, characterized in that: The first crossbeam (2) and the second crossbeam (3) are both provided with limit alarm devices.

8. A method for using a position conversion device for a ship maintenance platform, characterized in that: Using the ship maintenance platform position conversion device according to any one of claims 1 to 7 comprises the following steps: S1, fixing the maintenance platform fixing assembly (6) to the maintenance platform; S2. Using the vessel's own crane to tie and lift the maintenance platform; S3, starting the first drive assembly (4) and the second drive assembly (5) to drive the maintenance platform fixing assembly (6) to move, and starting the third drive assembly (7) to drive the maintenance platform fixing assembly (6) to move in the vertical direction until the first positioning hole on the maintenance platform fixing assembly (6) is aligned with the second positioning hole of the base flange (8) provided on the gantry cross wall plate; S4. Insert positioning bolts into the first positioning hole and the second positioning hole to complete the positioning and installation of the maintenance platform.

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