Hoisting device for mounting cooling triangle of indirect air cooling system

Abstract

The utility model provides a hoisting device for mounting a cooling triangle of an indirect air cooling system. The hoisting device comprises a first main beam frame and a second main beam frame which are connected, the fixing bracket is arranged at the end, away from the second main beam frame, of the first main beam frame and comprises a fixing support and a fixing plate, the fixing support is perpendicular to the first main beam frame, the fixing plate is arranged at the end, away from the first main beam frame, of the fixing support, and the fixing bracket extends into a flange of the cooling triangular pipe opening. The flange is arranged on the inner wall of a pipe opening of the cooling triangle in a protruding mode, and the fixing plate supports and fixes the cooling triangle from the interior of the flange. The number of the supporting parts is two, the two supporting parts are connected to the two ends of the second main beam frame correspondingly, and the supporting parts correspondingly support connecting rods arranged on the outer sides of the cooling triangles in a protruding mode. According to the hoisting device for mounting the cooling triangle of the indirect air cooling system, the technical problems of high hoisting difficulty and low mounting efficiency in the process of hoisting the cooling triangle in a traditional hoisting mode in related technologies are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of hoisting equipment for indirect air cooling systems, and particularly relates to a hoisting device for installing cooling triangles of indirect air cooling systems. Background Art

[0002] Indirect air cooling technology is applicable to generator sets with various installed capacities. Due to its advantages such as stable operation, high reliability, low power consumption, good water-saving performance, good anti-freezing effect, low operation and maintenance costs, and little influence of hot air reflux, it has been widely recognized by the market after years of development and application and has developed rapidly in China.

[0003] The air cooling tubes (also known as "cooling triangles") of the indirect air cooling system are vertically placed at the bottom of the cooling tower. Air flows outside the tubes, and cooling water cools down inside the tubes. The installation of the cooling triangle is the most important step in the installation of the indirect air cooling system. Its installation workload is large, and the installation accuracy requirements are high. For the project of using a hoisting machine throughout the installation process, the selection of hoisting methods and hoisting riggings during the installation process will directly affect the safety, quality, and efficiency of the construction. At present, the main hoisting method for the cooling triangle of the indirect air cooling system is to directly connect a hoisting belt, steel wire rope, snap ring, manual hoist, etc. to the triangular structure at the top of the cooling triangle for positioning, adjustment, and installation. However, it is difficult to control the balance of the equipment during the hoisting process with the traditional hoisting method, and improper operation may cause equipment damage. The hoisting workload is large, the installation efficiency is low, and the safety factor is low.

[0004] Therefore, the existing technology needs to be further developed. Summary of the Utility Model

[0005] The purpose of the utility model is to overcome the above technical deficiencies and provide a hoisting device for installing cooling triangles of indirect air cooling systems to solve the technical problems of large hoisting difficulty and low installation efficiency in the process of hoisting cooling triangles with the traditional hoisting method in related technologies.

[0006] To achieve the above technical objectives, the present utility model adopts the following technical solutions: A hoisting device for installing a cooling triangle of an indirect air cooling system is provided, including: a main beam frame, the main beam frame includes a first main beam frame and a second main beam frame, and the first main beam frame and the second main beam frame are connected; a fixed bracket, the fixed bracket is arranged at one end of the first main beam frame away from the second main beam frame, the fixed bracket includes a fixed support and a fixed plate, the fixed support is perpendicular to the first main beam frame, the fixed plate is arranged at one end of the fixed support away from the first main beam frame, and the fixed bracket extends into the flange inside the cooling triangle pipe orifice, wherein the flange protrudes on the inner wall of the cooling triangle pipe orifice, and the fixed plate supports and fixes the cooling triangle from the inside of the flange; a support member, there are two support members, and the two support members are respectively connected to both ends of the second main beam frame, and each support member respectively supports a connecting rod protruding outside the cooling triangle.

[0007] Further, the first main beam frame and the second main beam frame are arranged perpendicular to each other.

[0008] Further, the main beam frame further includes a reinforcing rod, there are two reinforcing rods, one end of each reinforcing rod is connected to the first main beam frame, and the other end of each reinforcing rod is connected to the second main beam frame, and the reinforcing rod is used to reinforce the connection between the first main beam frame and the second main beam frame.

[0009] Further, the support member includes a connecting plate, a limiting plate and a supporting plate, the connecting plate is connected to the side of the second main beam frame away from the first main beam frame, the connecting plate, the limiting plate and the supporting plate are connected in sequence, and both the connecting plate and the supporting plate are perpendicular to the limiting plate to form a receiving groove. When hoisting the cooling triangle, the supporting plate supports the connecting rod, and the connecting rod is stuck in the receiving groove.

[0010] Further, the flange is arranged around the inner wall orifice of the cooling triangle for one week, there are two fixed plates, both fixed plates are fixed on the fixed support, and an included angle is formed between the two fixed plates, and the size of the included angle matches the included angle between the adjacent pipe walls of the cooling triangle, so that the two fixed plates respectively fit and support the flanges on the two adjacent pipe walls inside the cooling triangle.

[0011] Further, the hoisting device further includes a limiting component, the limiting component includes a hollow limiting column and a plug pin, the hollow limiting column is arranged at the end of the first main beam frame, the fixed bracket is located between the hollow limiting column and the second main beam frame, and the plug pin is detachably arranged. When the plug pin is inserted into the hollow limiting column, the plug pin presses against the cooling triangle to prevent the cooling triangle from shaking or falling during hoisting.

[0012] Further, the limiting component further includes a reinforcing pin, the reinforcing pin passes through the first main beam frame through the hollow limiting column and the plug pin, so as to reinforce the connection between the hollow limiting column and the plug pin.

[0013] Furthermore, a hoisting groove is provided at one end of the first main beam frame away from the second main beam frame. The hoisting groove is located on the side of the fixed bracket away from the second main beam frame. The hoisting device further includes a hoisting assembly, and the hoisting assembly includes a hoisting shaft. The hoisting shaft is arranged in the hoisting groove. After connecting the hoisting device with the cooling triangle, the hoisting machine is connected to the hoisting shaft through a sling, so as to hoist the hoisting device and the cooling triangle.

[0014] Furthermore, the hoisting assembly further includes a hoisting part, and the hoisting part is arranged on the first main beam frame. After the hoisting machine hoists the hoisting device and the cooling triangle, the hoisting part is hoisted with a sling, so as to hoist the cooling triangle.

[0015] Furthermore, there are two first main beam frames, and the two first main beam frames are arranged in parallel and are both connected to the second main beam frame.

[0016] Beneficial effects:

[0017] 1. The hoisting device for installing the cooling triangle of the indirect air-cooling system of the present invention realizes the precise support and fixation of the cooling triangle through the fixed bracket and the supporting components, avoids the problem that it is difficult to control the balance of equipment in the traditional hoisting method, reduces the risk of equipment damage, simplifies the hoisting process at the same time, and improves the installation efficiency and safety.

[0018] 2. The hoisting device is equipped with a limiting component and a hoisting component, and the fixation, hoisting and transfer of the cooling triangle can be realized through simple operations, reducing the operation difficulty and labor intensity and improving the work efficiency.

[0019] 3. The hoisting device for installing the cooling triangle of the indirect air-cooling system of the present invention has the first main beam frame and the second main beam frame connected and reinforced by a reinforcing rod, making the structure of the whole hoisting device more stable, capable of bearing greater hoisting weight and stress, and ensuring the stability and safety during the hoisting process. Description of the drawings

[0020] Figure 1 is a schematic structural diagram of the first perspective of the hoisting device for installing the cooling triangle of the indirect air-cooling system of the present invention;

[0021] Figure 2 is a schematic structural diagram of the cooling triangle in the prior art;

[0022] Figure 3 is a usage state diagram of the first perspective of the hoisting device for installing the cooling triangle of the indirect air-cooling system of the present invention;

[0023] Figure 4 is a schematic structural diagram of the second perspective of the hoisting device for installing the cooling triangle of the indirect air-cooling system of the present invention;

[0024] Figure 5 It is a cross-sectional view of the third perspective of the hoisting device for installing the cooling triangle of the indirect air cooling system adopted in the embodiment of the present utility model;

[0025] Figure 6 It is a usage state diagram of the second perspective of the hoisting device for installing the cooling triangle of the indirect air cooling system of the present utility model;

[0026] Figure 7 It is Figure 5 a partial enlarged view of part A in

[0027] Among them, the above-mentioned drawings include the following reference numerals:

[0028] 1. Main beam frame; 11. First main beam frame; 12. Second main beam frame; 13. Reinforcing rod; 2. Fixed bracket; 21. Fixed support; 22. Fixed plate; 3. Cooling triangle; 31. Flange; 32. Connecting rod; 4. Support component; 41. Connecting plate; 42. Limiting plate; 43. Support plate; 44. Accommodating groove; 5. Hoisting groove; 6. Limiting component; 61. Hollow limiting column; 62. Plug pin; 63. Reinforcing pin; 7. Lifting component; 71. Lifting shaft; 72. Hoisting part. Detailed implementation manners

[0029] In order to enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0030] According to the embodiment of the present utility model, a hoisting device for installing the cooling triangle of the indirect air cooling system is provided. Please refer to Figures 1 to 7 , including: a main beam frame 1, the main beam frame 1 includes a first main beam frame 11 and a second main beam frame 12, and the first main beam frame 11 and the second main beam frame 12 are connected; a fixed bracket 2, the fixed bracket 2 is arranged at one end of the first main beam frame 11 away from the second main beam frame 12, the fixed bracket 2 includes a fixed support 21 and a fixed plate 22, the fixed support 21 is perpendicular to the first main beam frame 11, the fixed plate 22 is arranged at one end of the fixed support 21 away from the first main beam frame 11, and the fixed bracket 2 extends into the flange 31 at the pipe orifice of the cooling triangle 3, wherein the flange 31 protrudes on the inner wall of the pipe orifice of the cooling triangle 3, and the fixed plate 22 supports and fixes the cooling triangle 3 from the inside of the flange 31; support components 4, there are two support components 4, and the two support components 4 are respectively connected to both ends of the second main beam frame 12, and each support component 4 respectively corresponds to support the connecting rod 32 protruding outside the cooling triangle 3. AsFigure 2 As shown, a connecting rod 32 is provided on the outer side of the cooling triangle to be hoisted, and a flange 31 is provided on the triangular pipe orifice. The combination of the fixed support 21 and the fixed plate 22 can accurately extend into the flange 31 of the orifice of the cooling triangle 3 and support and fix the cooling triangle 3 from the inside. The precise cooperation between the fixed support bracket 2 and the support member 4 makes the hoisting work simple and efficient. Compared with the traditional hoisting method, this method can more accurately position and fix the cooling triangle 3, thus reducing the workload of multiple adjustments and corrections required due to inaccurate positioning. The hoisting device for installing the cooling triangle of the indirect air-cooling system in this embodiment solves the technical problems of large hoisting difficulty and low installation efficiency in the traditional hoisting method during the hoisting process of the cooling triangle in the related art.

[0031] Refer to Figure 1 and Figure 3 In the hoisting device for installing the cooling triangle of the indirect air-cooling system in this embodiment, the first main beam frame 11 and the second main beam frame 12 are arranged perpendicular to each other. The first main beam frame 11 and the second main beam frame 12 form a stable right-angle structure, which has high stability in mechanics, can bear greater hoisting weight and stress, ensure that the device will not deform or be damaged during the hoisting process, and thus ensure the safe progress of the hoisting operation.

[0032] Refer to Figure 1 and Figure 3 In the hoisting device for installing the cooling triangle of the indirect air-cooling system in this embodiment, the main beam frame 1 further includes two reinforcing bars 13. One end of each reinforcing bar 13 is connected to the first main beam frame 11, and the other end of each reinforcing bar 13 is connected to the second main beam frame 12. The reinforcing bars 13 are used to reinforce the connection between the first main beam frame 11 and the second main beam frame 12. The reinforcing bars 13 on both sides of the first main beam frame 11 improve the strength and stability of the hoisting device when bearing the hoisting weight and stress.

[0033] Refer to Figure 4 , Figure 5 and Figure 6 In the hoisting device for installing the cooling triangle of the indirect air-cooling system in this embodiment, the support member 4 includes a connecting plate 41, a limiting plate 42 and a support plate 43. The connecting plate 41 is connected to the side of the second main beam frame 12 away from the first main beam frame 11. The connecting plate 41, the limiting plate 42 and the support plate 43 are connected in sequence. Both the connecting plate 41 and the support plate 43 are perpendicular to the limiting plate 42 to form a receiving groove 44. When hoisting the cooling triangle 3, the support plate 43 supports the connecting rod 32, and the connecting rod 32 is stuck in the receiving groove 44. The setting of the receiving groove 44 enables the connecting rod 32 to be accurately stuck therein, thus realizing the precise positioning of the cooling triangle during the hoisting process. Cooperating with the fixed plate 22 to support the flange 31 and clamping from both ends of the cooling triangle makes the hoisting operation more simple and fast.

[0034] See also Figure 3 In the hoisting device for installing the cooling triangle of the indirect air cooling system of the present embodiment, the flange 31 is arranged around the inner wall pipe opening of the cooling triangle 3, there are two fixing plates 22, both of which are fixed on the fixing bracket 21, and an angle is formed between the two fixing plates 22, the size of which matches the angle of the adjacent pipe walls of the cooling triangle 3, so that the two fixing plates 22 respectively fit and support the flanges 31 on the two adjacent pipe walls inside the cooling triangle 3. There is an angle between the two fixing plates 22, forming an "eight"-shaped structure, which is connected to the flange 31 in the top pipe opening of the cooling triangle 3. The fixing plate 22 of the "eight"-shaped structure can better adapt to the shape of the flange 31 in the top pipe opening of the cooling triangle, forming a stable support point, so that the fixing plate 22 can fit the flange 31 more accurately, ensuring accurate alignment during the hoisting process. The operator only needs to extend the fixing bracket 2 into the pipe opening of the cooling triangle and appropriately adjust the position of the fixing plate 22 to achieve quick connection and support. This simplified operation process improves work efficiency and reduces operation difficulty.

[0035] See also Figure 4 , Figure 6 and Figure 7 The hoisting device for installing the cooling triangle of the indirect air cooling system of this embodiment further includes a limit assembly 6, which includes a hollow limit column 61 and a latch 62. The hollow limit column 61 is arranged at the end of the first main beam frame 11, and the fixed bracket 2 is located between the hollow limit column 61 and the second main beam frame 12. The latch 62 is detachably arranged. When the latch 62 is inserted into the hollow limit column 61, the latch 62 supports the cooling triangle 3 to prevent the cooling triangle 3 from shaking or falling during the hoisting process. The design of the hollow limit column 61 and the latch 62 can be adjusted according to different cooling triangle sizes and shapes.

[0036] See also Figure 7 In the hoisting device for installing the cooling triangle of the indirect air cooling system of this embodiment, the limit assembly 6 also includes a reinforcing pin 63, which passes through the first main beam frame 11 and penetrates the hollow limit column 61 and the latch 62, thereby reinforcing the connection between the hollow limit column 61 and the latch 62. In the absence of the reinforcing pin 63, the connection between the latch 62 and the hollow limit column 61 may be affected by external factors (such as vibration, impact, etc.) and become loose or fall off. The addition of the reinforcing pin 63 effectively avoids this situation, and it ensures that the latch 62 can always firmly support the cooling triangle 3 to prevent it from shaking or falling off during the hoisting process.

[0037] See also Figure 1, for the lifting device of the cooling triangle of the indirect air-cooling system in this embodiment, a lifting groove 5 is provided at one end of the first main beam frame 11 away from the second main beam frame 12. The lifting groove 5 is located on the side of the fixed bracket 2 away from the second main beam frame 12. The lifting device further includes a lifting assembly 7. The lifting assembly 7 includes a lifting shaft 71. The lifting shaft 71 is arranged in the lifting groove 5. After connecting the lifting device with the cooling triangle 3, the hoist is connected to the lifting shaft 71 through a sling, so as to lift the lifting device and the cooling triangle 3. The lifting shaft 71 is arranged in the lifting groove 5, providing a stable lifting point for the lifting device.

[0038] Refer to Figure 1 and Figure 6 , for the lifting device of the cooling triangle of the indirect air-cooling system in this embodiment, the lifting assembly 7 further includes a lifting part 72. The lifting part 72 is arranged on the first main beam frame 11. After the hoist lifts the lifting device and the cooling triangle 3, a sling is used to lift the lifting part 72, so as to lift the cooling triangle 3. The lifting shaft 71 is the positioning point for the lifting tool, and the lifting part 72 serves as the lifting point when the cooling triangle is installed.

[0039] When the lifting device in this embodiment is used, it is connected to the lifting shaft 71 through a sling, and the lifting device is hoisted to the positioning point at the top of the cooling triangle. It is connected to the positioning point at the top of the cooling triangle through the accommodating groove 44 and the fixed bracket 2. The lifting device and the top lifting point position of the cooling triangle are restricted and fixed by the pin 62 of the limiting assembly 6, and then the lifting of the cooling triangle is started. Two hoists are required for the lifting and positioning of the cooling triangle. One hoist is connected to the lifting part 72 of the lifting device, and the other hoist is connected to the bottom end of the cooling triangle. The two hoists are slowly hoisted to a certain height at the same time, and then the hoist connected to the bottom end of the cooling triangle slowly lowers the hook until the auxiliary machinery is unhooked at last. At this time, the cooling triangle is in a vertical installation state. The hoist connected to the lifting part 72 hoists the cooling triangle to the installation position, and after fine adjustment, the high-altitude installation work of the cooling triangle can be completed. After the cooling triangle is installed and fixed, the reinforcement pin 63 is loosened, and the pin 62 is pulled out from the hollow limiting column 61 to release the connection between the lifting device and the cooling triangle. The lifting device in this embodiment has a simple structure, low manufacturing cost, is easy to use, has high safety, ensures the balance of the equipment during the lifting process, avoids equipment damage, and greatly improves the installation efficiency of the cooling triangle.

[0040] For the lifting device of the cooling triangle of the indirect air-cooling system in this embodiment, there are two first main beam frames 11. The two first main beam frames 11 are arranged in parallel, and both of the two first main beam frames 11 are connected to the second main beam frame 12. The spaced arrangement of the two first main beam frames 11 improves the strength of the overall lifting device.

[0041] It should be noted that the terms "first", "second", etc. in the description, claims and the above-mentioned drawings of this application are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of this application described here can be implemented in an order other than those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0042] Optionally, the specific examples in this embodiment may refer to the examples described in the above-mentioned embodiments, and will not be elaborated here.

[0043] The serial numbers of the above-mentioned embodiments of this application are only for description and do not represent the superiority or inferiority of the embodiments.

[0044] In the above-mentioned embodiments of this application, the descriptions of each embodiment have their own emphases. For the parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0045] The above are only the preferred embodiments of this application. It should be noted that for those of ordinary skill in the art, without departing from the principle of this application, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of this application.

Claims

1. A hoisting device for installing a cooling triangle of an indirect air cooling system, characterized in that: include: A main beam frame (1), the main beam frame (1) comprising a first main beam frame (11) and a second main beam frame (12), the first main beam frame (11) and the second main beam frame (12) being connected; a fixed bracket (2), the fixed bracket (2) being arranged at one end of the first main beam frame (11) away from the second main beam frame (12), the fixed bracket (2) comprising a fixed bracket (21) and a fixed plate (22), the fixed bracket (21) being perpendicular to the first main beam frame (11), the fixed plate (22) being arranged at one end of the fixed bracket (21) away from the first main beam frame (11), the fixed bracket (22) extending into a flange (31) of a pipe opening of a cooling triangle (3), wherein the flange (31) is convexly arranged on an inner wall of the pipe opening of the cooling triangle (3), and the fixed plate (22) supports and fixes the cooling triangle (3) from the inside of the flange (31); Support components (4), there are two support components (4), the two support components (4) are respectively connected to the two ends of the second main beam frame (12), and each support component (4) corresponds to supporting a connecting rod (32) provided on the outer side of the cooling triangle (3) protruding therefrom.

2. The hoisting device for installing the cooling triangle of the indirect air cooling system according to claim 1, characterized in that: The first main beam frame (11) and the second main beam frame (12) are arranged perpendicular to each other.

3. The hoisting device for installing the cooling triangle of the indirect air cooling system according to claim 2, characterized in that: The main beam frame (1) further comprises a reinforcing rod (13), wherein there are two reinforcing rods (13), one end of each reinforcing rod (13) is connected to the first main beam frame (11), and the other end of each reinforcing rod (13) is connected to the second main beam frame (12), and the reinforcing rod (13) is used to reinforce the connection between the first main beam frame (11) and the second main beam frame (12).

4. The hoisting device for installing the cooling triangle of the indirect air cooling system according to claim 1, characterized in that: The support component (4) comprises a connecting plate (41), a limiting plate (42) and a supporting plate (43); the connecting plate (41) is connected to a side of the second main beam frame (12) away from the first main beam frame (11); the connecting plate (41), the limiting plate (42) and the supporting plate (43) are connected in sequence; the connecting plate (41) and the supporting plate (43) are both perpendicular to the limiting plate (42) to form a receiving groove (44); when the cooling triangle (3) is hoisted, the supporting plate (43) supports the connecting rod (32), and the connecting rod (32) is stuck in the receiving groove (44).

5. The hoisting device for installing the cooling triangle of the indirect air cooling system according to claim 1, characterized in that: The flange (31) is arranged around the inner wall pipe opening of the cooling triangle (3), and there are two fixing plates (22). The two fixing plates (22) are fixed on the fixing bracket (21). An angle is formed between the two fixing plates (22), and the size of the angle matches the angle of adjacent pipe walls of the cooling triangle (3), so that the two fixing plates (22) respectively adhere to and support the flanges (31) on the two adjacent pipe walls inside the cooling triangle (3).

6. The hoisting device for installing the cooling triangle of the indirect air cooling system according to claim 1, characterized in that: The hoisting device further comprises a limit assembly (6), wherein the limit assembly (6) comprises a hollow limit column (61) and a latch (62), wherein the hollow limit column (61) is arranged at an end of the first main beam frame (11), and the fixed bracket (2) is located between the hollow limit column (61) and the second main beam frame (12), and the latch (62) is detachably arranged, and when the latch (62) is inserted into the hollow limit column (61), the latch (62) supports the cooling triangle (3) to prevent the cooling triangle (3) from shaking or falling during the hoisting process.

7. The hoisting device for installing the cooling triangle of the indirect air cooling system according to claim 6, characterized in that: The limiting assembly (6) further comprises a reinforcing pin (63), wherein the reinforcing pin (63) passes through the first main beam frame (11) and penetrates the hollow limiting column (61) and the latch pin (62), thereby reinforcing the connection between the hollow limiting column (61) and the latch pin (62).

8. The hoisting device for installing the cooling triangle of the indirect air cooling system according to claim 1, characterized in that: A lifting groove (5) is provided at one end of the first main beam (11) away from the second main beam (12), and the lifting groove (5) is located on a side of the fixed bracket (2) away from the second main beam (12). The lifting device also includes a lifting assembly (7), and the lifting assembly (7) includes a lifting shaft (71). The lifting shaft (71) is arranged in the lifting groove (5). After the lifting device is connected to the cooling triangle (3), the lifting machine is connected to the lifting shaft (71) through a lifting rope, thereby lifting the lifting device and the cooling triangle (3).

9. The hoisting device for installing the cooling triangle of the indirect air cooling system according to claim 8, characterized in that: The lifting assembly (7) further comprises a lifting part (72), wherein the lifting part (72) is arranged on the first main beam frame (11), and when the lifting machine lifts the lifting device and the cooling triangle (3), the lifting part (72) is then lifted by a lifting rope, thereby lifting the cooling triangle (3).

10. The hoisting device for installing the cooling triangle of the indirect air cooling system according to claim 1, characterized in that: There are two first main beam frames (11), the two first main beam frames (11) are arranged in parallel, and the two first main beam frames (11) are both connected to the second main beam frame (12).

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