Portal frame convenient to disassemble and assemble
By using threaded connection between threaded column and threaded hole and locking box limit design, combined with reinforced rib diagonal bracing structure, the problems of easy wear and inconvenient disassembly and assembly of traditional gantry rollers are solved, realizing stable connection of rollers and efficient disassembly and assembly of gantry, improving overall stability and ease of operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-14
- Publication Date
- 2026-03-03
AI Technical Summary
Traditional gantry roller designs suffer from wear and corrosion of threaded pairs, resulting in high maintenance costs and inconvenient disassembly and assembly, which affects operational stability and service life.
The threaded connection method using threaded columns and threaded holes, combined with the locking box and cover limiting structure, prevents impurities from entering and facilitates the disassembly and maintenance of the rollers; the reinforced ribs form a stable triangular support structure, enhancing the anti-overturning ability.
It improves the connection stability and ease of assembly and disassembly of the rollers, reduces maintenance costs, enhances the overall stability and anti-overturning ability of the gantry, and ensures the safety and flexibility of movement.
Smart Images
Figure CN223963150U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of gantry crane technology, specifically a gantry crane that is easy to assemble and disassemble. Background Technology
[0002] Gantry cranes, as a common support or moving structure, are widely used in industries, construction, logistics and other fields. Their core function is to provide stable load-bearing and moving capabilities. They are usually composed of beams, columns and roller assemblies. As a key component for the movement of the gantry crane, the rollers directly affect its operational stability, load capacity and service life.
[0003] Traditional gantry roller designs typically employ an integrated structure of the wheel body and frame. The wheel body is directly fixed to the frame via an axle, and the roller bracket is connected to the frame's threaded hole via the external thread of a standard bolt. This threaded pair is directly exposed to vibration, leading to fretting wear on the threaded contact surface. Furthermore, corrosion or impurities can exacerbate thread engagement failure, increasing maintenance costs. During maintenance, the entire frame and associated fasteners must be disassembled, resulting in inconvenient disassembly or adjustment, and operational limitations depending on the size of the installation space. Additionally, the threaded pair directly bears the vibration and impact of the wheel body, leading to poor overall stability under frequent disassembly and assembly conditions. Utility Model Content
[0004] The purpose of this utility model is to provide a gantry frame that is easy to assemble and disassemble, so as to solve the problems mentioned in the background art.
[0005] To solve the above-mentioned technical problems, this utility model provides a conveniently detachable gantry frame, including a vertical tube, a sleeve, a bottom cross brace, and a top horizontal tube. The top horizontal tube is equipped with a lifting device body. The lower surface of the bottom cross brace is equipped with a wheel assembly, which includes a mounting plate. A rotating seat is mounted on the bottom of the mounting plate. An outer mounting frame is mounted on the bottom of the rotating seat. A roller connecting frame is mounted on the inner side of the outer mounting frame. A roller is rotatably connected to the inner side of the roller connecting frame. An installation mechanism is provided on the outer side of the outer mounting frame. The installation mechanism includes a locking box. The locking box and the outer mounting frame have a through hole. The roller connecting frame has a threaded hole. A threaded post is provided inside the locking box. The threaded post is threadedly connected to the through hole and the threaded hole.
[0006] Furthermore, a rotating handle is installed at the end of the threaded post away from the mounting frame, a cover is hinged to the front of the locking box, and limit posts are fixedly installed on the back of the cover. There are four limit posts, and the positions of the limit posts correspond to the upper and lower ends of the rotating handle.
[0007] Furthermore, a nut is installed inside the locking box, the nut is matched with the position of the through hole, and the nut is threadedly connected to the threaded post.
[0008] Furthermore, the mounting plate and the bottom cross brace are detachably connected by bolts.
[0009] Furthermore, a handle is installed on the front of the cover.
[0010] Furthermore, the bottom sides of the riser are equipped with reinforcing ribs and diagonal braces, and the bottom ends of the reinforcing ribs and diagonal braces are welded to the bottom cross braces.
[0011] Furthermore, the riser is welded to the top of the riser, the inner arc wall of the sleeve matches the outer arc wall of the top horizontal pipe, the top horizontal pipe is slidably fitted with a sliding sleeve, and the lifting device body is installed at the bottom end of the sliding sleeve.
[0012] Furthermore, positioning bolts are installed at both ends of the top horizontal tube, and mounting holes matching the positioning bolts are opened on the vertical tube.
[0013] Compared with the prior art, the beneficial effects of this utility model are:
[0014] 1. This utility model utilizes a threaded connection between a threaded post and a threaded hole to facilitate the secure installation of the roller connecting bracket inside the mounting frame. Disassembly is simple: just reverse the rotation of the threaded post to remove the roller connecting bracket, making maintenance, replacement, and disassembly of the rollers convenient. Furthermore, the locking box effectively protects the threaded pair structure formed by the threaded post and threaded hole, further preventing the intrusion of impurities.
[0015] 2. This utility model, through the cooperation of the cover and the limiting post, allows the threaded post to be locked when needed. Closing the cover restricts the rotation of the handle, preventing the threaded post from loosening due to external force. When disassembly or adjustment is required, simply open the cover and rotate the handle to loosen the threaded post. The operation is convenient and quick. The nut serves as the fixing base for the threaded post, and the threaded post is stably embedded inside the locking box through a threaded connection. The design, in conjunction with the locking box, limits the rotation range of the threaded post, preventing excessive rotation from causing transmission failure. Reinforcing ribs are welded to both sides of the bottom of the riser, and the bottom ends of the ribs are welded to the bottom horizontal brace to form a stable triangular support structure, enhancing the overall anti-overturning ability. The top of the riser is welded to ensure the load-bearing stability of the top horizontal pipe. Attached Figure Description
[0016] Figure 1 This is a structural diagram of a gantry frame body that is easy to assemble and disassemble;
[0017] Figure 2 This is a schematic diagram of the structure below the bottom cross brace in a gantry frame that is easy to disassemble and assemble;
[0018] Figure 3 This is a schematic diagram of the structure inside the locking box in a gantry frame that is easy to disassemble and assemble;
[0019] Figure 4 This is an exploded view of the mounting plate below a gantry frame that is easy to disassemble and reassemble.
[0020] In the picture:
[0021] 1. Riser; 2. Sleeve; 3. Bottom cross brace; 4. Top cross pipe; 5. Sliding sleeve; 6. Lifting device body; 7. Mounting plate; 8. Rotating seat; 9. Mounting frame; 10. Roller; 11. Roller connecting frame; 12. Locking box; 13. Cover; 14. Handle; 15. Limiting post; 16. Rotating handle; 17. Threaded post; 18. Nut; 19. Through hole; 20. Threaded hole. Detailed Implementation
[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0023] Please see Figure 1-4 This utility model provides a technical solution:
[0024] See Figure 3 and Figure 4 As shown, a gantry frame that is easy to assemble and disassemble includes a vertical tube 1, a sleeve 2, a bottom cross brace 3, and a top horizontal tube 4. The top horizontal tube 4 is equipped with a lifting device body 6. The lower surface of the bottom cross brace 3 is equipped with a wheel assembly, which includes a mounting plate 7. A rotating seat 8 is mounted on the bottom of the mounting plate 7. An outer mounting frame 9 is mounted on the bottom of the rotating seat 8. A roller connecting frame 11 is mounted on the inner side of the outer mounting frame 9. A roller 10 is rotatably connected to the inner side of the roller connecting frame 11. An installation mechanism is provided on the outer side of the outer mounting frame 9. The installation mechanism includes a locking box 12. The locking box 12 and the outer mounting frame 9 have a through hole 19. The roller connecting frame 11 has a threaded hole 20. A threaded post 17 is provided in the locking box 12. The threaded post 17 passes through the through hole 19 and is threadedly connected to the threaded hole 20.
[0025] In the specific implementation process, rotate the threaded post 17 to gradually screw it into the threaded hole 20 until a suitable tightness is achieved, ensuring that the roller connecting bracket 11 is firmly installed inside the mounting frame 9. For disassembly, rotate the threaded post 17 in the opposite direction to remove it from the threaded hole 20, then the roller connecting bracket 11 can be removed from inside the mounting frame 9, facilitating maintenance and replacement of the roller 10. The design of the rotating seat 8 allows the mounting frame 9 to rotate at a certain angle relative to the mounting plate 7, thereby changing the direction of the roller 10 and improving the flexibility of the gantry's movement. The threaded connection between the threaded post 17 and the threaded hole 20 provides sufficient tightening force to ensure a stable and reliable connection between the roller connecting bracket 11 and the mounting frame 9, preventing loosening or detachment during gantry movement and ensuring the safety of gantry movement. The rotating seat 8 incorporates a self-aligning roller bearing, model GB / T. 283-2007, its outer ring is interference-fitted with the mounting plate 7, and the inner ring is fixed to the rotating shaft of the mounting frame 9 by set screws. When the roller 10 is subjected to radial impact, the bearing rolling elements absorb vibration energy through elastic deformation. At the same time, the relative deflection of the inner and outer rings eliminates the additional load caused by installation error. According to the vibration test standard JB / T 8877-2001, the vibration amplitude transmitted to the threaded column 17 can be reduced by 80%.
[0026] It should be noted that: riser 1 is DN80 with a wall thickness of 4mm and a height of 3.5 meters; sleeve 2 is DN100 with a wall thickness of 4mm; top horizontal pipe 4 is DN80 with a thickness of 4mm and a length of 2 meters; bottom horizontal support 3 is made of GB / T707 hot-rolled No. 10 channel steel, 0.6 meters long, 100mm×48mm×3mm×5mm, with a cross-sectional area of 174cm². 2 The weight is 10kg / m, 100mm is the section height, 48mm is the flange width, 3mm is the web thickness, and 5mm is the flange thickness.
[0027] See Figure 2 and Figure 3As shown, a rotating handle 16 is installed at the end of the threaded post 17 away from the mounting frame 9. A cover 13 is hinged to the front of the locking box 12. Limiting posts 15 are fixedly installed on the back of the cover 13. There are four limiting posts 15. The positions of the limiting posts 15 correspond to the upper and lower ends of the rotating handle 16. A nut 18 is installed inside the locking box 12. The nut 18 matches the position of the through hole 19. The nut 18 is threadedly connected to the threaded post 17. The mounting plate 7 and the bottom cross brace 3 are detachably connected by bolts. A handle 14 is installed on the front of the cover 13. In the specific implementation process, when it is necessary to lock the threaded post 17, the cover 13 is closed, so that the limit post 15 restricts the rotation of the handle 16, thereby preventing the threaded post 17 from loosening due to external force. When it is necessary to disassemble or adjust the gantry, simply open the cover 13 and turn the handle 16 to loosen the threaded post 17, and the disassembly or adjustment operation can be easily carried out. The design of the handle 14 makes the opening and closing of the cover 13 more convenient and quick, improving the ease of operation. The nut 18 serves as the fixed base of the threaded post 17. The threaded post 17 is stably embedded in the locking box 12 through the threaded connection. Its internal thread and the spiral structure of the threaded post 17 form a rigid engagement, avoiding structural displacement due to external impact or vibration. The matching design of the nut 18 and the locking box 12 limits the rotation range of the threaded post 17. When the threaded post 17 is screwed into the nut 18, its end forms a mechanical stop with the inner wall of the locking box 12, preventing excessive rotation from causing transmission failure.
[0028] It should be noted that a trapezoidal thread is provided in the mating section between the threaded post 17 and the nut 18. The trapezoidal thread has a tooth angle of 30°, which improves wear resistance by 3 times compared with ordinary triangular threads. The threaded hole 20 is embedded with a high-polymer thread bushing made of polytetrafluoroethylene composite material.
[0029] The existing one-piece molded roller 10 is a detachable mechanical connection structure composed of external and internal threads. Its core function is to achieve fastening, transmission or sealing through helical friction. The engagement of the threaded post 17 and the threaded hole 20 constitutes a typical threaded pair, which locks the roller connecting frame 11 to ensure the stable operation of the roller 10.
[0030] See Figure 1As shown, the bottom sides of the riser 1 are equipped with reinforcing ribs and diagonal braces. The bottom ends of the reinforcing ribs and diagonal braces are welded to the bottom horizontal brace 3. The riser 1 is welded to the top end of the riser 1. The inner arc wall of the sleeve 2 matches the outer arc wall of the top horizontal pipe 4. The top horizontal pipe 4 is slidably fitted with a sliding sleeve 5. The main body of the lifting device 6 is installed at the bottom end of the sliding sleeve 5. Positioning bolts are installed at both ends of the top horizontal pipe 4. The riser 1 has mounting holes that match the positioning bolts. In the specific implementation process, the bottom sides of the riser 1 are welded with reinforcing ribs and diagonal braces. The bottom ends of the diagonal braces are welded to the bottom horizontal brace 3 to form a stable triangular support structure, which enhances the overall anti-overturning ability. The top of the riser 1 is connected by welding to ensure the load-bearing stability of the top horizontal pipe 4. The inner arc wall of the sleeve 2 matches the outer arc wall of the top horizontal pipe 4 to achieve sliding connection, which facilitates the disassembly and assembly of the top horizontal pipe 4. The top horizontal pipe 4 is equipped with positioning bolts at both ends. By tightening the positioning bolts, the position of the top horizontal pipe 4 inside the sleeve 2 can be fixed to prevent slippage during operation. A sliding sleeve 5 is fitted on the top horizontal pipe 4 so that the lifting body 6 can move horizontally along the top horizontal pipe 4 to adapt to different lifting point requirements. The sliding sleeve 5 can be manually adjusted to improve the operational flexibility.
[0031] Working principle:
[0032] Step 1: The top ends of the vertical pipes 1 are welded together. The sleeve 2 is fitted onto the top horizontal pipe 4, and the inner arc wall of the sleeve 2 matches the outer arc wall of the top horizontal pipe 4 to achieve a sliding connection. By installing positioning bolts at both ends of the top horizontal pipe 4 and cooperating with the mounting holes opened on the vertical pipe 1, tightening the positioning bolts can fix the position of the top horizontal pipe 4 in the sleeve 2, preventing it from sliding during operation and ensuring the stability of the top structure of the gantry frame. Reinforcing ribs are installed on both sides of the bottom of the vertical pipe 1. The bottom end of the ribs is welded to the bottom horizontal support 3 to form a stable triangular support structure, which enhances the overall anti-overturning ability of the gantry frame and improves the stability of the gantry frame when carrying heavy objects. A sliding sleeve 5 is slidably fitted on the top horizontal pipe 4. The lifting device body 6 is installed at the bottom end of the sliding sleeve 5. By manually adjusting the position of the sliding sleeve 5 on the top horizontal pipe 4, the lifting device body 6 can be moved horizontally along the top horizontal pipe 4 to adapt to different lifting point requirements.
[0033] Step 2: When it is necessary to lock the threaded post 17, close the cover 13 so that the limit post 15 restricts the rotation of the handle 16, thereby preventing the threaded post 17 from loosening due to external force. When it is necessary to disassemble or adjust the gantry, simply open the cover 13 and turn the handle 16 to loosen the threaded post 17, and you can easily carry out disassembly or adjustment operations. The design of the handle 14 makes the opening and closing of the cover 13 more convenient and quick, improving the ease of operation. The nut 18 serves as the fixed base for the threaded post 17. Through the threaded connection, the threaded post 17 is stably embedded into the locking box 12. Its internal thread and the spiral structure of the threaded post 17 form a rigid engagement, avoiding structural displacement due to external impact or vibration. The fit design of the nut 18 and the locking box 12 limits the rotation range of the threaded post 17. When the threaded post 17 is screwed into the nut 18, its end forms a mechanical stop with the inner wall of the locking box 12, preventing excessive rotation from causing transmission failure.
[0034] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.
Claims
1. A portable gantry comprising a vertical pipe (1), a sleeve pipe (2), a bottom cross pipe (3), and a top cross pipe (4) to which a hoist body (6) is attached, characterized in that, The lower surface of the bottom cross brace (3) is provided with a wheel body assembly, which comprises a mounting plate (7), a rotating seat (8) mounted at the bottom of the mounting plate (7), a mounting outer frame (9) mounted at the bottom of the rotating seat (8), a roller connecting frame (11) mounted inside the mounting outer frame (9), a roller (10) rotatably connected inside the roller connecting frame (11), and an installation mechanism provided outside the mounting outer frame (9), which comprises a locking box (12) and a threaded hole (20) formed in the roller connecting frame (11).
2. A modular gantry according to claim 1, wherein: One end of the threaded column (17) away from the mounting outer frame (9) is provided with a rotating handle (16), the front surface of the locking box (12) is hingedly connected with a cover (13), the back surface of the cover (13) is fixedly provided with four limiting columns (15), and the positions of the limiting columns (15) correspond to the upper and lower positions of the two ends of the rotating handle (16).
3. A knock down gantry as claimed in claim 2, wherein: The locking box (12) is provided with a nut (18) inside, the position of the nut (18) matches that of the through hole (19), and the nut (18) is threadedly connected with the threaded column (17).
4. A modular gantry according to claim 1, wherein: The mounting plate (7) is detachably connected with the bottom cross brace (3) through bolts.
5. A modular gantry according to claim 2, wherein: The front surface of the cover (13) is provided with a handle (14).
6. A modular gantry according to claim 1, wherein: The bottom of the vertical pipe (1) is provided with a reinforcing rib diagonal brace, and the bottom end of the reinforcing rib diagonal brace is welded with the bottom cross brace (3).
7. A knock down gantry as claimed in claim 6, wherein: The vertical pipe (1) is welded with the top end of the vertical pipe (1), the inner arc wall of the sleeve pipe (2) matches the outer arc wall of the top cross pipe (4), the top cross pipe (4) is slidably sleeved with a sliding sleeve (5), and the lifting tool body (6) is mounted at the bottom end of the sliding sleeve (5).
8. A modular gantry according to claim 7, wherein: The two ends of the top cross pipe (4) are provided with positioning bolts, and the vertical pipe (1) is provided with mounting holes matched with the positioning bolts.