Adjustable wooden yacht hoisting and setting bracket

Abstract

This application discloses an adjustable wooden boat hoisting and placement bracket, relating to the field of wooden boat hoisting and placement equipment. It includes square steel, I-beams, and an adjustment mechanism. Two square steels are arranged parallel and spaced apart. Multiple I-beams are located at the bottom of the square steels and are arranged horizontally at intervals, with the length direction of the I-beams perpendicular to the length direction of the square steels. The adjustment mechanism is located on the top surface of the I-beams and is used to adjust the distance between the two square steels. A support mechanism is also provided on the bottom surface of the I-beams to maintain stability with the ground. This application ensures that the bracket remains stable on the ground through the support mechanism. Even if the ground is uneven, adjusting the leveling components of the support mechanism can keep the bracket in a horizontal state, preventing the boat from tilting due to uneven ground, and preventing the boat from colliding with other objects or shifting due to bracket tilting, thus ensuring the safety of the boat placement process.

Description

Technical Field

[0001] This application relates to the technical field of hoisting and placement equipment for wooden cruise ships, and in particular to an adjustable hoisting and placement bracket for wooden cruise ships. Background Technology

[0002] Wooden boats are widely used in landscape engineering due to their aesthetic appeal and environmental friendliness. However, their structural strength is relatively low, making them prone to damage when hoisted or temporarily moved ashore due to changes in water level. This presents numerous challenges to the hoisting and placement of wooden boats.

[0003] In landscape engineering, due to changes in water levels and other factors, it is often necessary to hoist or temporarily relocate wooden boats to the shore. However, wooden boats have relatively low structural strength, are easily damaged by bumps and knocks, and are not convenient for frequent hoisting. Currently, the industry mainly uses customized metal frame brackets for hoisting and placing wooden boats. While these customized metal frame brackets can provide some support for wooden boats, they have significant shortcomings. The brackets cannot be adjusted in size, meaning they are only suitable for boats of a specific size. When the boat's size changes, new brackets must be custom-made, resulting in high costs. Moreover, they are not reusable, making them extremely uneconomical for scenarios requiring frequent boat replacements or involving multiple boats of different sizes.

[0004] To address the aforementioned technical issues and to resolve the problem that the bracket cannot be adjusted in size and can only be used for cruise ships of a specific size, the applicant has designed an adjustable wooden cruise ship hoisting and placement bracket. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to propose an adjustable wooden cruise ship hoisting and mounting bracket.

[0006] This application provides an adjustable wooden cruise ship hoisting and mounting bracket, which adopts the following technical solution: An adjustable wooden boat hoisting and mounting bracket includes two square steel bars arranged in parallel and spaced apart. Multiple I-beams are provided at the bottom of the two square steel bars, with their length directions perpendicular to the length directions of the two square steel bars and spaced apart. An adjustment mechanism for adjusting the distance between the two square steel bars is provided on the top surface of each I-beam, and a support mechanism is provided on the bottom surface of each I-beam.

[0007] By adopting the above technical solution, square steel and I-beams form the basic frame structure of the bracket. The parallel square steel can bear the main weight of the cruise ship, while the I-beams perpendicular to the square steel provide lateral support and connection. The adjustment mechanism allows the spacing between the two square steels to be flexibly adjusted according to the size of the cruise ship, solving the problem that traditional brackets cannot adapt to cruise ships of different sizes. The support mechanism ensures the stability of the bracket on the ground, preventing the cruise ship from tilting and being damaged due to uneven ground.

[0008] Preferably, the adjusting mechanism is a connecting steel ring, and there are multiple connecting steel rings, each of which is sleeved on one of the two square steels, with the connecting steel rings on the two square steels corresponding to each other; the multiple I-beams are respectively connected to the bottom of the corresponding connecting steel rings on the two square steels; the top surface of the multiple I-beams has multiple bolt holes along its length, and the bottom surface of the connecting steel rings is provided with bolts for connection with threaded holes.

[0009] By adopting the above technical solution, multiple connecting steel rings are fitted onto two square steel beams to form a sliding connection node. The connecting steel rings on the two square steel beams correspond one-to-one, and the top surface of the I-beam is bolted to the bottom surface of the corresponding connecting steel ring. When it is necessary to adjust the spacing between the square steel beams, the bolts between the connecting steel rings and the I-beams are loosened, allowing the connecting steel rings to move along the length of the I-beams, thereby causing the square steel beams to move synchronously and adjusting the spacing. After adjustment, the connecting steel rings are fixed in place by the engagement of bolts and threaded holes, ensuring structural stability. This design utilizes a modular combination of connecting steel rings and I-beams, making the spacing adjustment process convenient and precise, and adaptable to cruise ships of different widths.

[0010] Preferably, both square steel bars have multiple threaded holes on their two side walls along their length, and bolts that are threaded to the two side walls of the connecting steel ring are threaded through them.

[0011] By adopting the above technical solution, the threaded holes on the sidewall of the square steel and the bolts on the sidewall of the connecting steel ring form a double fixing structure. The connecting steel ring is fixed to the H-beam by the bottom bolts; the sidewall bolts can further lock the connecting steel ring onto the square steel, preventing the adjusted connecting steel ring from slipping due to force during hoisting. The multiple threaded holes allow the connecting steel ring to be fixed at different positions on the square steel. Loosening the bolts between the connecting steel ring and the square steel allows the connecting steel ring to move along the length of the square steel, thereby causing the H-beam connected to the bottom of the connecting steel ring to move synchronously, thus meeting the requirements for adjusting the spacing between the H-beams to accommodate cruise ships of different lengths, enhancing the flexibility and reliability of the structure.

[0012] Preferably, a lifting assembly is provided at the top of the connecting steel ring.

[0013] By adopting the above technical solution, the lifting assembly is directly installed on the top of the connecting steel ring, allowing the lifting load to be directly transferred to the frame structure composed of square steel and I-beams through the connecting steel ring, ensuring a short and stable force transmission path. This design avoids the structural complexity caused by adding additional lifting supports, while keeping the lifting point aligned with the center of gravity of the bracket, improving balance during the lifting process.

[0014] Preferably, the lifting assembly includes connecting plates and lifting rings for connecting to external lifting equipment. There are two connecting plates, both of which are fixedly installed on the top of the connecting steel ring. A fixing plate is provided on the lifting ring, with one end of the fixing plate away from the lifting ring located between the two connecting plates and fixedly connected to the two connecting plates.

[0015] By adopting the above technical solution, two connecting plates are symmetrically fixed to the top of the connecting steel ring, forming a stable support structure; a fixing plate is inserted between the two connecting plates and fixed by welding or bolts, so that the lifting ring and the connecting steel ring form a rigid whole. This structural design can evenly distribute the tension during hoisting, avoid damage to the connection between the lifting ring and the connecting steel ring due to uneven force, and at the same time ensure that the lifting ring remains vertical during hoisting, preventing the cruise ship from being bumped due to tilting.

[0016] Preferably, the top surface of the I-beam is provided with a buffer member, and two buffer members are provided, spaced apart, and each buffer member abuts against the connecting steel ring at the top of the I-beam; the buffer member includes an inclined plate and a horizontal plate, the top of the inclined plate abuts against the side wall of the connecting steel ring, and the bottom of the inclined plate abuts against the top surface of the I-beam; the horizontal plate is located between the inclined plate and the connecting steel ring, and is detachably connected to the top surface of the I-beam; one side of the horizontal plate is fixedly connected to the side of the inclined plate near the bottom.

[0017] By adopting the above technical solution, the buffer component forms a triangular support structure through the combination of inclined plates and horizontal plates: the inclined plates are set at an angle, which can decompose the vertical pressure when the cruise ship is placed into horizontal and vertical components, reducing the direct impact on the hull; the horizontal plates are detachably connected to the top surface of the I-beam for easy maintenance and replacement, and are fixedly connected to the inclined plates to enhance the overall support strength. When the cruise ship comes into contact with the bracket, the buffer component can absorb the impact force through structural deformation, avoiding direct collision between the metal bracket and the wooden hull. It is especially suitable for objects that are easily bumped, such as wooden cruise ships, effectively reducing the risk of hull cracking or wear.

[0018] Preferably, a rubber pad is provided on the top surface of the I-beam, and the rubber pad is located between the two buffer members.

[0019] By adopting the above technical solution, the rubber pad is made of elastic material and has excellent shock absorption and cushioning performance. When the cruise ship vibrates during placement on the bracket or during hoisting, the rubber pad can absorb energy through its own deformation, reducing the rigid contact between the metal I-beams and the bottom of the hull. At the same time, the rubber pad has a high surface friction, which can increase the stability between the hull and the bracket and prevent the cruise ship from sliding on the bracket. Placed between two buffer components, it forms a double protection with the buffer components, further enhancing the protective effect on the hull.

[0020] Preferably, the support mechanism is a leveling support plate, which is fixedly connected to the bottom surface of the I-beam. The leveling support plate is rectangular, and through holes are provided at the four corners of the leveling support plate. Leveling components are provided at each of the four through holes. Each leveling component includes a leveling bolt and at least two leveling nuts. A support base is also provided at the bottom of the leveling bolt. At least two leveling nuts are threaded onto the leveling bolt. When the leveling bolt is inserted into the through hole, at least two leveling nuts are located on both sides of the leveling support plate and cooperate to clamp the leveling support plate, thereby fixing the leveling bolt to the leveling support plate.

[0021] By adopting the above technical solution, the leveling support plate is fixedly connected to the bottom surface of the I-beam, forming the connection interface between the bracket and the ground. The leveling components at the four corners can be independently adjusted in height. By rotating the leveling nuts, the extension length of the leveling bolts can be changed, ensuring the bracket remains level on uneven ground. The support base increases the contact area between the leveling bolts and the ground, preventing the bolts from sinking into soft ground and improving support stability. When the bracket is placed on different terrains, the I-beam can be kept level by adjusting the leveling bolts at the four corners, preventing the cruise ship from tilting due to uneven ground. This prevents the cruise ship from colliding with other objects or shifting due to the bracket being tilted, ensuring safety during the installation process.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. Square steel and I-beams form the basic frame structure of the bracket. The parallel square steel supports the main weight of the cruise ship, while the perpendicular I-beams provide lateral support and connection. The adjustable mechanism allows the spacing between the two square steels to be flexibly adjusted according to the size of the cruise ship, solving the problem that traditional brackets cannot adapt to different sizes of cruise ships. The support mechanism ensures the stability of the bracket on the ground, preventing the cruise ship from tilting and being damaged due to uneven ground. 2. Multiple connecting steel rings are fitted onto two square steel beams to form a sliding connection node. The connecting steel rings on the two square steel beams correspond one-to-one, and the top surface of the I-beam is bolted to the bottom surface of the corresponding connecting steel ring. When it is necessary to adjust the spacing between the square steel beams, the bolts between the connecting steel rings and the I-beams are loosened, allowing the connecting steel rings to move along the length of the I-beams, thereby moving the square steel beams synchronously and adjusting the spacing. After adjustment, the connecting steel rings are fixed by the engagement of bolts and threaded holes to ensure structural stability. This design utilizes modular connecting steel rings and I-beams to make the spacing adjustment process convenient and precise, adaptable to cruise ships of different widths. 3. The leveling support plate is fixedly connected to the bottom of the I-beam, forming the interface between the bracket and the ground. The leveling components at the four corners can be independently adjusted in height. By rotating the leveling nuts, the extension length of the leveling bolts can be changed, ensuring the bracket remains level on uneven ground. The support base increases the contact area between the leveling bolts and the ground, preventing the bolts from sinking into soft ground and improving support stability. When the bracket is placed on different terrains, the I-beam can be kept level by adjusting the leveling bolts at the four corners, preventing the boat from tilting due to uneven ground. This prevents the boat from colliding with other objects or shifting due to bracket tilting, ensuring safety during installation. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 yes Figure 1 Enlarged view of point A in the middle; Figure 3 This is a schematic diagram illustrating the structure of the buffer component in this utility model; Figure 4 This is an exploded view of the support mechanism and leveling component of this utility model.

[0024] Reference numerals: 1. Square steel; 2. I-beam; 3. Adjustment mechanism; 31. Connecting steel ring; 4. Support mechanism; 41. Leveling support plate; 411. Through hole; 5. Lifting assembly; 51. Connecting plate; 52. Lifting ring; 521. Fixing plate; 6. Rubber pad; 7. Buffer; 71. Inclined plate; 72. Horizontal plate; 8. Leveling component; 81. Leveling bolt; 811. Support base; 82. Leveling nut. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0026] This application discloses an adjustable wooden cruise ship hoisting and mounting bracket.

[0027] Reference Figure 1 and Figure 2An adjustable wooden boat hoisting and mounting bracket includes square steel 1, I-beams 2, and an adjustment mechanism 3. There are two square steel 1s, which are arranged in parallel and spaced apart. There are multiple I-beams 2, which are all located at the bottom of the square steel 1s and are arranged horizontally and spaced apart. The length direction of the I-beams 2 is perpendicular to the length direction of the square steel 1. The adjustment mechanism 3 is located on the top surface of the I-beams 2 and is used to adjust the distance between the two square steel 1s. The bottom surface of the I-beams 2 is also provided with a support mechanism 4 for maintaining stability with the ground.

[0028] Specifically, the adjusting mechanism 3 consists of multiple connecting steel rings 31, each fitted onto one of two square steel bars 1. The two square steel bars 1 are hollow, with open ends. Multiple threaded holes are formed along the length of each opposite side wall of the two square steel bars 1. The square steel bars 1 pass through the connecting steel rings 31, with gaps between their top and bottom surfaces and the inner top and bottom surfaces of the connecting steel rings 31. The side walls of the square steel bars 1 fit snugly against the inner side walls of the connecting steel rings 31. Bolts pass through the side walls of the connecting steel rings 31, securing them to the side walls of the square steel bars 1.

[0029] The top surfaces of multiple I-beams 2 are respectively connected to the bottom of corresponding connecting steel rings 31 on two square steels 1. Multiple threaded holes are opened along the length of the I-beams 2. Bolts are passed through the inner bottom surface of the connecting steel rings 31. The connecting steel rings 31 are fixedly connected to the top surface of the I-beams 2 by bolts.

[0030] In use, place the wooden boat at the gap between the two square steel beams 1. Adjust the spacing according to the size of the boat. First, loosen the bolts connecting the side walls of the connecting steel ring 31 to the threaded holes of the square steel beam 1, and the bolts connecting the bottom surface of the connecting steel ring 31 to the threaded holes of the I-beam 2, allowing the connecting steel ring 31 to slide freely on the square steel beam 1. After confirming the spacing is appropriate, retighten the bolts connecting the connecting steel ring 31 to the square steel beam 1 and the I-beam 2. The position of the square steel beam 1 is fixed by the cooperation of the bolts and the threaded holes, ensuring the stability of the adjusted spacing. This design allows for size adjustment and is suitable for wooden boats of various sizes, improving the versatility and economy of the equipment.

[0031] Specifically, a lifting assembly 5 is provided on the top surface of the connecting steel ring 31. The lifting assembly 5 includes a connecting plate 51 and a lifting ring 52 for connecting to external lifting equipment. Two connecting plates 51 are provided, which are installed parallel and vertically on the top surface of the connecting steel ring 31. A fixing plate 521 is provided on the lifting ring 52. The side of the fixing plate 521 away from the lifting ring 52 is located between the two connecting plates 51 and is fixedly connected to the two connecting plates 51. The fixed connection between the fixing plate 521 and the connecting plates 51 forms a rigid whole, preventing relative displacement between the lifting ring 52 and the connecting steel ring 31, and further enhancing the structural stability during hoisting.

[0032] Furthermore, a rubber pad 6 is provided on the connecting plate 51 near the conventional side, with the rubber pad 6 being the side of the connecting plate 51 closest to the hull. When the wooden boat experiences lateral swaying during hoisting to the bracket or placement, the rubber pad 6 can absorb the impact force between the hull and the connecting plate 51 through elastic deformation, preventing the metal connecting plate 51 from directly pressing against the side of the wooden hull and preventing damage such as scratches, dents, or cracks.

[0033] Reference Figure 3 Two buffer components 7 are provided on the top surface of the I-beam 2. Each buffer component 7 abuts against the opposite sidewalls of two connecting steel rings 31 on the top surface of the I-beam 2. A rubber pad 6 is also provided between the two buffer components 7, and the rubber pad 6 is fixedly connected to the top surface of the I-beam 2. The buffer component 7 includes an inclined plate 71 and a horizontal plate 72. The top of the inclined plate 71 abuts against the sidewall of the connecting steel ring 31, and the bottom of the inclined plate 71 abuts against the top surface of the I-beam 2. A gap is created between the side of the inclined plate 71 near the bottom and the sidewall of the connecting steel ring 31. The horizontal plate 72 is located in the gap between the inclined plate 71 and the connecting steel ring 31. Bolts pass through the horizontal plate 72, and the horizontal plate 72 is fixedly connected to the top surface of the I-beam 2. The end of the horizontal plate 72 away from the connecting steel ring 31 is fixedly connected to the end of the inclined plate 71 near the bottom. When the cruise ship is placed, the inclined plate 71 decomposes the vertical pressure into horizontal and vertical components through its tilt angle, reducing the direct impact on the hull. This design avoids rigid collisions between the metal bracket and the wooden hull, reducing the risk of cracking or wear caused by impacts. The rubber pad 6 has good elasticity, and when the wooden boat is placed on the bracket or vibrates during hoisting, the rubber pad 6 can absorb energy through deformation, reducing the rigid impact between the metal bracket and the hull, and preventing damage such as cracking or wear caused by impacts.

[0034] Reference Figure 4 Specifically, the support mechanism 4 is a leveling support plate 41. There are two leveling support plates 41, which are spaced apart on the bottom surface of the I-beam 2 and fixedly connected to the bottom surface of the I-beam 2 with bolts. The leveling support plate 41 is rectangular in shape, and through holes 411 are opened at the four corners of the leveling support plate 41. Leveling parts 8 are set at the four through holes 411.

[0035] The leveling component 8 includes a leveling bolt 81 and two leveling nuts 82. A support base 811 is located at the bottom of the leveling bolt 81. Both leveling nuts 82 are threaded onto the leveling bolt 81. When the leveling bolt 81 is inserted into the through hole 411, the two leveling nuts 82 are located on both sides of the leveling support plate 41 and cooperate to clamp the leveling support plate 41, thereby fixing the leveling bolt 81 onto the leveling support plate 41. The leveling bolts 81 at the four corners of the leveling support plate 41 can be independently adjusted in height. By rotating the leveling nuts 82, the bolt extension length can be changed, keeping the bracket level on uneven ground. This design effectively addresses complex terrain commonly found in landscape engineering, preventing the bracket from tilting due to uneven ground, and thus preventing wooden boats from bumping or shifting due to bracket tilting.

[0036] The implementation principle of this application embodiment is as follows: Multiple connecting steel rings 31 are sleeved on two hollow square steels 1. Each square steel 1 has multiple threaded holes along its length. Loosening the bolts allows the connecting steel rings 31 to slide. The connecting steel rings 31 are bolted to the I-beam 2, thereby moving the I-beam 2 to accommodate cruise ships of different lengths. The bolts are then tightened for fixation. Multiple connecting steel rings 31 are sleeved on two hollow square steels 1. The bottoms of two corresponding connecting steel rings 31 are bolted to the top surface of the I-beam 2. The top surface of the I-beam 2 has multiple threaded holes along its length. Loosening the bolts allows adjustment of the distance between the connecting steel rings 31 on both sides, moving them closer or further apart. The connecting steel rings 31 are sleeved on the square steels 1, allowing the two square steels 1 to move closer or further apart to accommodate cruise ships of different widths. The bolts are then tightened for fixation. The lifting assembly 5 uses a fixing plate 521 and two connecting plates 51 to fix the lifting ring 52 to the top surface of the connecting steel ring 31. During installation, the load is transmitted to the I-beam 2 via the lifting ring 52, connecting plate 51, and connecting steel ring 31. The rubber pad 6 on the connecting plate 51 buffers the lateral impact on the hull. The inclined plate 71 and the horizontal plate 72 on the top surface of the I-beam 2 form a buffer 7. The inclined plate 71 decomposes the vertical pressure on the hull, and the horizontal plate 72 enhances the support. The rubber pad 6 between the two buffers 7 absorbs vibration and protects the hull. The leveling support plate 41 on the bottom surface of the I-beam 2 is equipped with leveling bolts 81 at the four corners. By rotating the nut to adjust the height of the bolts, the bracket can be kept level on uneven ground. The support base 811 expands the contact area to prevent sinking, thereby realizing the adjustable hoisting and stable placement of the wooden cruise ship.

[0037] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An adjustable wooden cruise ship hoisting and mounting bracket, characterized in that, It includes two square steel bars (1), which are arranged in parallel and spaced apart. Multiple I-beams (2) are provided at the bottom of the two square steel bars (1). The length direction of the multiple I-beams (2) is perpendicular to the length direction of the two square steel bars (1), and the multiple I-beams (2) are arranged at intervals. An adjustment mechanism (3) for adjusting the distance between the two square steel bars (1) is provided on the top surface of the I-beams (2), and a support mechanism (4) is provided on the bottom surface of the I-beams (2).

2. The adjustable wooden cruise ship hoisting and mounting bracket according to claim 1, characterized in that, The adjusting mechanism (3) is a connecting steel ring (31), and there are multiple connecting steel rings (31). The multiple connecting steel rings (31) are all sleeved on the two square steels (1), and the connecting steel rings (31) on the two square steels (1) correspond one to one; the multiple I-beams (2) are respectively connected to the bottom of the corresponding connecting steel rings (31) on the two square steels (1); the top surface of the multiple I-beams (2) is provided with multiple threaded holes along its length direction, and the bottom surface of the connecting steel rings (31) is provided with bolts for connecting with the threaded holes.

3. The adjustable wooden cruise ship hoisting and mounting bracket according to claim 2, characterized in that, Both square steels (1) have multiple threaded holes on their two side walls along their length direction, and bolts that are threaded to the two side walls of the connecting steel ring (31) are threaded through the two side walls of the square steel (1).

4. The adjustable wooden cruise ship hoisting and mounting bracket according to claim 2, characterized in that, The top of the connecting steel ring (31) is provided with a lifting assembly (5).

5. The adjustable wooden cruise ship hoisting and mounting bracket according to claim 4, characterized in that, The lifting assembly (5) includes a connecting plate (51) and a lifting ring (52) for connecting to an external lifting device. There are two connecting plates (51), and both connecting plates (51) are fixedly installed on the top of the connecting steel ring (31). A fixing plate (521) is provided on the lifting ring (52). The end of the fixing plate (521) away from the lifting ring (52) is located between the two connecting plates (51) and is fixedly connected to the two connecting plates (51).

6. The adjustable wooden cruise ship hoisting and mounting bracket according to claim 2, characterized in that, The top surface of the I-beam (2) is provided with a buffer member (7). There are two buffer members (7), which are spaced apart. The two buffer members (7) abut against the connecting steel ring (31) on the top surface of the I-beam (2). The buffer member (7) includes an inclined plate (71) and a horizontal plate (72). The top of the inclined plate (71) abuts against the side wall of the connecting steel ring (31), and the bottom of the inclined plate (71) abuts against the top surface of the I-beam (2). The horizontal plate (72) is located between the inclined plate (71) and the connecting steel ring (31) and is detachably connected to the top surface of the I-beam (2). One side of the horizontal plate (72) is fixedly connected to the side of the inclined plate (71) near the bottom.

7. The adjustable wooden cruise ship hoisting and mounting bracket according to claim 6, characterized in that, A rubber pad (6) is provided on the top surface of the I-beam (2), and the rubber pad (6) is located between the two buffer members (7).

8. The adjustable wooden cruise ship hoisting and mounting bracket according to claim 1, characterized in that, The support mechanism (4) is a leveling support plate (41). The leveling support plate (41) is fixedly connected to the bottom surface of the I-beam (2). The leveling support plate (41) is rectangular. Through holes (411) are provided at the four corners of the leveling support plate (41). Leveling components (8) are provided at each of the four through holes (411). The leveling component (8) includes a leveling bolt (81) and at least two leveling nuts (82). A support base (811) is also provided at the bottom of the leveling bolt (81). At least two leveling nuts (82) are threaded on the leveling bolt (81). When the leveling bolt (81) is inserted into the through hole (411), at least two leveling nuts (82) are located on both sides of the leveling support plate (41) and cooperate with each other to clamp the leveling support plate (41), thereby fixing the leveling bolt (81) to the leveling support plate (41).

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