Auxiliary hoisting equipment for bridge construction

Abstract

The application relates to the technical field of building disassembly and assembly, and discloses an auxiliary hoisting equipment for bridge construction, the upper end surface of a support plate is provided with a first lifting ring in the middle, the both ends of the support plate are hingedly provided with extension plates, the free end of each extension plate is vertically fixed with a third lifting ring, a fixed plate is fixedly arranged below the support plate through a pair of support blocks, a concave frame is arranged at the bottom surface of the fixed plate, a double-end hook is rotatably arranged at the bottom end of the concave frame, a movable plate is rotatably arranged between the fixed plate and the support plate, the movable plate is driven by a cylinder arranged in the concave frame, the free end of the movable plate is fixed with a second lifting ring, when the movable plate is in the normal position, the free end of the movable plate extends to the outside and exceeds the support plate to support the extension plate, and when the movable plate is in the inclined position, the movable plate is completely arranged below the support plate. The device increases the bearing points, provides different hoisting modes, and effectively improves the universality of the hoisting equipment.

Description

Technical Field

[0001] This invention belongs to the field of building assembly and disassembly, and particularly relates to building hoisting tools, specifically an auxiliary hoisting device for bridge construction. Background Technology

[0002] In bridge construction, hoisting equipment is commonly used to improve construction progress. Different bridge components, such as box girders and T-beams, need to be transported to their designated installation locations using lifting equipment. During hoisting, specific conditions such as the hoisting angle and center of gravity significantly impact hoisting efficiency and stability. Current technologies typically employ specialized, customized hoisting equipment, tailored to different bridge types like box girders and T-beams, and even specific conditions such as hoisting angles and center of gravity. This results in low versatility, leading to frequent and repeated replacements of different types of specialized hoisting equipment during construction. This not only increases equipment inventory costs but also results in excessively long replacement times.

[0003] Moreover, the connection between the hoisting equipment and the end of the bridge erecting machine's boom is not a convenient quick-disassembly mode. It usually relies on a series of complex mechanical fasteners, such as high-strength bolt groups, large pins, stop plates, or pressure plates. These mechanical fasteners are numerous, and the disassembly and assembly process is cumbersome and highly dependent on manual operation. It requires the coordination of multiple people and even the use of heavy machinery such as auxiliary cranes for micro-operations, which takes a long time. Therefore, an auxiliary hoisting equipment for bridge construction is needed. Summary of the Invention

[0004] In order to solve the problems of poor versatility, cumbersome disassembly and assembly, insufficient load balance control and inconvenient angle adjustment of existing bridge construction hoisting equipment, which make it difficult to meet the construction needs of modern bridge engineering for high efficiency, safety and flexibility, this invention provides an auxiliary hoisting device for bridge construction.

[0005] This invention is achieved using the following techniques:

[0006] This invention provides an auxiliary hoisting device for bridge construction, including a support plate. A first lifting ring is provided in the middle of the upper surface of the support plate. Extension plates are hinged to both ends of the support plate. A third lifting ring is vertically fixed to the free end of the extension plate. A fixed plate is fixed below the support plate by a pair of support blocks. A concave frame is installed in the center of the bottom surface of the fixed plate. A double-headed hook is rotatably installed at the bottom end of the concave frame. A movable plate is rotatably installed between the fixed plate and the support plate. The movable plate is driven by a cylinder installed in the concave frame. A second lifting ring is fixed to the free end of the movable plate. When the movable plate is upright, the free end of the movable plate extends outward and exceeds the support plate to support the extension plate. When the movable plate is tilted, the movable plate is completely located below the support plate.

[0007] During implementation, it includes a support plate, which is a square plate. A first lifting ring is provided in the middle of the upper end face of the support plate. The first lifting ring is used to connect with the wire rope on the crane to achieve hoisting. The first lifting ring can be detached and installed by bolts. Extension plates are hinged to both ends of the support plate. A third lifting ring is vertically fixed to the free end of the extension plate.

[0008] A fixed plate is fixed below the support plate by a pair of support blocks. The fixed plate is circular. Specifically, a pair of support blocks are fixedly connected to both sides of the bottom end of the support plate, and the fixed plate is connected between the two support blocks. The support blocks are arranged to leave a gap between the fixed plate and the support plate. A concave frame is installed in the center of the bottom surface of the fixed plate. The concave cavity of the concave frame faces upward, and a double-headed hook is rotatably installed at the bottom end of the concave frame.

[0009] To adjust the angle of the double-headed hook for easier hooking of the sling, a concentric annular groove is cut into the lower surface of the fixing plate. A ring seat is rotatably mounted within the groove, and the ring seat is rigidly connected to the hook shank of the double-headed hook via a linkage. The linkage includes a linkage block mounted on the inner wall of the ring seat, and the lower surface of the linkage block is fixedly connected to a linkage plate via a linkage rod. The mounting surface of the linkage plate is fixed to the outer wall of the hook shank of the double-headed hook. A gear ring is fixedly mounted on the outer surface of the ring seat. A motor, adjustable by an external controller, is mounted on the lower surface of the fixing plate outside the annular groove. A gear that meshes with the gear ring is mounted on the motor's output end, and the gear is installed in a slot connecting the fixing plate and the annular groove. The motor drives the gear, causing the gear ring to rotate, thereby adjusting the angle of the double-headed hook.

[0010] A movable plate is rotatably mounted between the fixed plate and the support plate. The movable plate is driven by a cylinder installed in the concave frame. Specifically, a cylinder that is adjusted by an external controller is installed inside the concave cavity of the concave frame, and a vertical drive rod is fixedly connected to the output end of the cylinder.

[0011] The outer wall of the drive rod is provided with a radial sliding pin, which is slidably installed in the deflection groove on the inner wall of the auxiliary cylinder. The auxiliary cylinder rotates 45°~90° relative to the radial sliding pin. Preferably, the auxiliary cylinder rotates 45° relative to the radial sliding pin. The deflection groove includes a first straight groove, an arc groove, and a second straight groove connected in sequence. That is, the radial sliding pin slides from the first straight groove to the second straight groove and rotates 45°. The auxiliary cylinder is rotatably installed in the center of the support plate through a bearing, and its bottom is fixed in the center of the movable plate. The rotation of the auxiliary cylinder drives the movable plate to rotate synchronously.

[0012] To limit the position of the extension plate and ensure its stability during use, a positioning sliding hole is opened in the center of the movable plate along its length. A positioning plate that moves along the thickness direction of the movable plate is installed in the positioning sliding hole. The center of the positioning plate is rotatably mounted on the drive rod. Positioning pins are fixed on the upper surfaces of both ends of the positioning plate. When the positioning plate is in a high position, the positioning pins are higher than the upper surface of the movable plate and cooperate with the positioning pin holes opened on the surface of the extension plate.

[0013] The bottom surface of the support plate is symmetrically provided with a limiting pin, and the two sides of the movable plate are provided with limiting arc grooves. The limiting pin passes through the limiting arc grooves, and when the movable plate rotates, the limiting pin slides synchronously with the arc surface of the limiting arc groove to limit the rotation angle of the movable plate.

[0014] The top of the drive rod passes through the support plate and is fixedly connected to a limiting plate. The limiting plate is located between the two bottom fixed ends of the first lifting ring. Furthermore, the upper surface of the support plate is provided with a slot that allows the limiting plate to be inserted. The drive rod passes through the center of the slot. The two ends of the limiting plate are integrally connected to limiting blocks. The limiting blocks cooperate with the limiting grooves at the free ends of the extension plate. The limiting blocks lock the extension plate, making the extension plate stable in the folded state and ensuring that the extension plate is not affected by the outside world in the folded state. The limiting grooves and the third lifting ring are located on the two sides of the extension plate. The extension plate has a clearance notch for the limiting plate on the back side of the third lifting ring, and the limiting groove is opened at the edge of the clearance notch.

[0015] A second lifting ring is fixed to the free end of the movable plate. When the movable plate is upright, the free end of the movable plate extends outward and exceeds the support plate to support the extension plate. When the movable plate is tilted, the movable plate is completely located below the support plate.

[0016] When in use, this device can adopt three different lifting modes. A crane is placed on the upper surface of the bridge, and the wire rope on the crane is connected to the first lifting ring to achieve lifting. It is suitable for lifting points at different distances. The slings connecting the components can be equipped with double-headed hooks, second lifting rings, and third lifting rings according to the actual use scenario.

[0017] The sling is suspended from the double-headed hook, the extension plate is in an upward folded state, the movable plate is in an oblique state, and the movable plate is completely below the support plate. At this time, the cylinder is in its minimum stroke, and the radial sliding pin is in the second straight groove on the inner wall of the auxiliary cylinder.

[0018] The movable plate is upright, and the sling is suspended from the second lifting ring. When switching states, the cylinder is activated by the external controller. The cylinder outputs vertically, driving the drive rod to rise. The radial sliding pin on the outer wall of the drive rod slides along the deflection groove on the inner wall of the auxiliary cylinder. That is, the radial sliding pin passes through the second straight groove, the arc groove, and the first straight groove in sequence. When the radial sliding pin rotates along the arc groove, the auxiliary cylinder rotates around the axis, thereby driving the movable plate to rotate 45°, so that the movable plate gradually changes from an inclined position to an upright position. At this time, the free end of the movable plate rotates outward and extends beyond the support plate.

[0019] Moreover, during the upward movement of the drive rod, the limiting plate and limiting block at the top of the drive rod move upward synchronously and extend out of the slot. The limiting blocks at both ends of the limiting plate cooperate with the limiting grooves at the free end of the extension plate to lock the extension plate, further ensuring the stability of the extension plate during use. During this process, the limiting pin on the bottom surface of the support plate slides along the limiting arc grooves on both sides of the movable plate, further limiting the rotation angle of the movable plate.

[0020] The sling is suspended from the third lifting ring. During the switching process, the output end of the control cylinder first descends, causing the limit block to descend and move out of the limit groove, unlocking the extension plate. The extension plate is then tilted down to a horizontal position. The control cylinder then outputs vertically, driving the drive rod upward. The movable plate extends and supports the bottom surface of the extension plate. The radial sliding pin slides along the deflection groove on the inner wall of the auxiliary cylinder. When the radial sliding pin passes the arc groove, the auxiliary cylinder rotates around its axis, causing the movable plate to rotate 45°, gradually changing it from an inclined position to a normal position. The movable plate then extends to support the extension plate. During the upward movement of the drive rod, the positioning plate simultaneously moves along the thickness direction within the positioning sliding hole. When the radial sliding pin passes the first straight groove, the positioning pins at both ends of the positioning plate extend from the upper surface of the movable plate and engage with the positioning pin holes on the extension plate surface, thus defining the position of the extension plate.

[0021] After use, the cylinder drives the drive rod to descend, and the radial sliding pin slides in the opposite direction along the deflection groove. That is, the radial sliding pin passes through the first straight groove, the arc groove, and the second straight groove in sequence. The positioning pin disengages from the positioning pin hole, and the movable plate rotates from the upright position back to the inclined position and completely rotates to the bottom of the support plate. The extension plate can be folded to the retracted state.

[0022] The multi-point hoisting mode increases the load-bearing points and expands the lever arm by extending the plate. Combined with the reasonable suspension position of the slings, it effectively prevents problems such as cracking of the precast slab structure, edge damage, or internal stress concentration caused by uneven force at the hoisting points or loss of control of the hoisting posture at a single point. Under the premise of ensuring safety and feasibility, it minimizes the number of slings used and reduces the physical exertion and preparation work of the workers.

[0023] When the angle of the double-headed hook needs to be adjusted, the motor on the lower surface of the fixed plate is started by the external controller. The gear at the output end of the motor meshes with the gear ring on the outer surface of the ring seat, causing the ring seat to rotate in the annular groove of the fixed plate. The ring seat is rigidly connected to the hook shank of the double-headed hook through the linkage, thereby causing the double-headed hook to rotate to adjust the angle.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] This application provides an auxiliary hoisting device for bridge construction. Through different hoisting modes, it effectively improves the versatility of the hoisting equipment. By increasing the load-bearing points, it effectively expands the lever arm. With reasonable sling suspension positions, it can more effectively distribute the load and resist the torque or eccentric force generated by the components during hoisting. The hoisting process is balanced and stable, which greatly suppresses the accidental swinging, rotation or tilting of the precast slab, significantly reduces the risk of component instability and falling or out-of-control collision, and protects hoisting safety.

[0026] In addition, this application ensures the stability of the extension plate in the unfolded state by adding a movable plate, and ensures the stability of the extension plate in the folded state by locking the extension plate with a limit block; the rotatable double-headed hook enables free adjustment, which helps to quickly reach the optimal hooking angle and reduces the difficulty of aerial operation. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the present invention in its unfolded state.

[0028] Figure 2 This is a bottom view of the structure of the present invention in its unfolded state.

[0029] Figure 3 This is a schematic diagram of the structure of the present invention in the folded state of the extension plate 7.

[0030] Figure 4 This is a bottom view schematic diagram of the recycle state of the present invention.

[0031] Figure 5 This is a schematic diagram showing the positions of the limiting plate 12, the limiting block 13, and the positioning pin hole 703 of the present invention.

[0032] Figure 6 This is a schematic cross-sectional view of the flipped portion of the present invention.

[0033] Figure 7 This is a schematic diagram of the internal structure of the present invention.

[0034] Figure 8 This is a schematic diagram of the internal structure of the present invention.

[0035] Figure 9 For the present invention Figure 8 Schematic diagram at point A in the middle.

[0036] Figure 10 This is a schematic diagram showing the installation positions of the auxiliary cylinder 9 and the positioning plate 16 of the present invention.

[0037] Figure 11 This is a cross-sectional view of the auxiliary cylinder 9 of the present invention.

[0038] Figure 12 This is a schematic diagram of the installation of the radial sliding pin 1101 of the present invention.

[0039] In the diagram: 1. First lifting ring; 2. Support block; 3. Fixing plate; 301. Annular groove; 4. Support plate; 401. Limiting pin; 402. Slot; 5. Concave frame; 6. Double-headed hook; 7. Extension plate; 701. Clearance notch; 702. Limiting groove; 703. Positioning pin hole; 8. Movable plate; 801. Support part; 802. Limiting arc groove; 803. Positioning sliding hole; 9. Auxiliary cylinder; 901. Deflection groove; 9011. First straight groove; 9012, Arc-shaped groove; 9013, Second straight groove; 10, Cylinder; 11, Drive rod; 1101, Radial sliding pin; 12, Limiting plate; 13, Limiting block; 14, Third lifting ring; 15, Second lifting ring; 16, Positioning plate; 1601, Positioning part; 17, Positioning pin; 18, Ring seat; 19, Gear ring; 20, Motor; 21, Gear; 22, Linkage component; 2201, Linkage plate; 2202, Linkage rod; 2203, Linkage block. Detailed Implementation

[0040] The specific embodiments of the present invention will be described in detail below.

[0041] An auxiliary hoisting device for bridge construction, such as Figures 1-12 As shown: It includes a support plate 4, which is a square plate. A first lifting ring 1 is provided in the middle of the upper end face of the support plate 4. The first lifting ring 1 is used to connect with the wire rope on the crane to achieve hoisting. The first lifting ring 1 can be detached and installed by bolts, which can achieve storage in minimal space. Extension plates 7 are hinged to both ends of the support plate 4. A third lifting ring 14 is vertically fixed to the free end of the extension plate 7.

[0042] A fixed plate 3 is fixedly mounted below the support plate 4 by a pair of support blocks 2. The fixed plate 3 is in the shape of a circular plate. Specifically, a pair of support blocks 2 are fixedly connected to both sides of the bottom end of the support plate 4, and the fixed plate 3 is connected between the two support blocks 2. By setting the support blocks 2, a gap is left between the fixed plate 3 and the support plate 4. A concave frame 5 is installed in the center of the bottom surface of the fixed plate 3, and a double-headed hook 6 is rotatably installed at the bottom end of the concave frame 5.

[0043] like Figure 6 As shown: In order to adjust the angle of the double-headed hook 6, a concentric annular groove 301 is opened on the lower surface of the fixing plate 3. An annular seat 18 is rotatably installed in the annular groove 301. The annular seat 18 is rotated by means of a ball bearing installed on the bottom surface of the annular seat 18 and mating with the annular groove 301. The annular seat 18 is rigidly connected to the hook handle of the double-headed hook 6 through a linkage 22. The linkage 22 includes a linkage block 2203 installed on the inner wall of the annular seat 18. The lower surface of the linkage block 2203 is fixedly connected to the linkage plate 2201 through a linkage rod 2202. The mounting surface of the linkage plate 2201 is fixed to the outer wall of the hook handle of the double-headed hook 6. A toothed ring 19 is fixedly provided on the outer surface of the annular seat 18.

[0044] like Figures 7-9 As shown: to clearly display the internal structure. Figure 7 The middle fixing plate 3 is not shown. Figure 8 The fixed plate 3 and the movable plate 8 are not shown. The lower surface of the fixed plate 3 is located outside the annular groove 301 and a motor 20 that is adjusted by an external controller is installed. The output end of the motor 20 is equipped with a gear 21 that mates with the gear ring 19. The gear 21 is installed in the slot that connects the fixed plate 3 and the annular groove 301.

[0045] A movable plate 8 is rotatably mounted between the fixed plate 3 and the support plate 4. The main body of the movable plate 8 is circular, and two support parts 801 are formed by radially protruding outward at both ends. The movable plate 8 is driven by a cylinder 10 installed in the concave frame 5. Specifically, a cylinder 10 adjusted by an external controller is installed inside the concave cavity of the concave frame 5. A vertical drive rod 11 is fixedly connected to the output end of the cylinder 10.

[0046] like Figure 11 , 12 As shown: Figure 11 This is for illustrative purposes only; the size ratio of the auxiliary cylinder 9 is not shown. Figure 12 The diagram shows a partial section of the drive rod 11. A radial sliding pin 1101 is provided on the outer wall of the drive rod 11. The radial sliding pin 1101 is slidably installed in the deflection groove 901 on the inner wall of the auxiliary cylinder 9. The auxiliary cylinder 9 rotates 45°~90° relative to the radial sliding pin 1101. Preferably, the auxiliary cylinder 9 rotates 45° relative to the radial sliding pin 1101. The deflection groove 901 includes a first straight groove 9011, an arc groove 9012, and a second straight groove 9013 connected in sequence. The auxiliary cylinder 9 is rotatably installed in the center of the support plate 4 through a bearing, and its bottom is fixed in the center of the movable plate 8.

[0047] To limit the position of the extension plate and ensure its stability during use, such as Figure 10 As shown: A positioning sliding hole 803 is opened in the center of the movable plate 8 along the length direction. A positioning plate 16 that moves along the thickness direction of the movable plate 8 is installed in the positioning sliding hole 803. The center of the positioning plate 16 is rotatably mounted on the drive rod 11. Positioning parts 1601 are formed at both ends of the positioning plate 16. Positioning pins 17 are fixed on the upper surfaces of both ends of the positioning plate 16. That is, the positioning pins 17 are fixed on the upper surfaces of the positioning parts 1601. When the positioning plate 16 is in a high position, the positioning pins 17 are higher than the upper surface of the movable plate 8 and cooperate with the positioning pin holes 703 opened on the surface of the extension plate 7.

[0048] The bottom surface of the support plate 4 is symmetrically provided with a limiting pin 401. The two sides of the movable plate 8 are provided with limiting arc grooves 802. The limiting pin 401 passes through the limiting arc grooves 802. When the movable plate 8 rotates, the limiting pin 401 slides synchronously with the arc surface of the limiting arc groove 802 to limit the rotation angle of the movable plate 8, prevent overtravel, and avoid excessive deflection.

[0049] The top end of the drive rod 11 passes through the support plate 4 and is fixedly connected to the limiting plate 12. The limiting plate 12 is located between the two bottom fixed ends of the first lifting ring 1. Further, as... Figure 5 As shown: The first lifting ring 1 and the third lifting ring 14 are not shown in the figure. The upper surface of the support plate 4 is provided with a slot 402 that allows the limiting plate 12 to be inserted. The drive rod 11 passes through the center of the slot 402. The two ends of the limiting plate 12 are integrally connected to the limiting blocks 13. The limiting blocks 13 cooperate with the limiting groove 702 at the free end of the extension plate 7. The limiting blocks 13 lock the extension plate 7, so that the extension plate 7 is stable in the folded state and ensures that the extension plate 7 is not affected by the outside in the folded state. The limiting groove 702 and the third lifting ring 14 are located on the two sides of the extension plate 7. The extension plate 7 is located on the back side of the third lifting ring 14 and has a clearance notch 701 for the limiting plate 12. The limiting groove 702 is opened at the edge of the clearance notch 701.

[0050] The free end of the movable plate 8 is fixed with a second lifting ring 15, that is, the end of the support part 801 is fixed with a second lifting ring 15. When the movable plate 8 is upright, the free end of the movable plate 8 extends outward and exceeds the support plate 4 to support the extension plate 7. When the movable plate 8 is tilted, the movable plate 8 is completely located below the support plate 4.

[0051] When in use, this device can adopt three different hoisting modes. A crane is placed on the upper surface of the bridge, and the steel wire rope on the crane is connected to the first lifting ring 1 to achieve hoisting. It is suitable for hoisting points at different distances. The slings connecting the components can be used with double-headed hooks 6, second lifting rings 15, and third lifting rings 14 according to the actual use scenario.

[0052] Lifting mode one, such as Figure 4 As shown: When hoisting a precast slab, only one sling is needed to ensure the balance of the hoisting, or only one end of the precast slab needs to be hoisted. In this case, first tie one sling around the precast slab, and then fix both ends of the sling to the double-headed hook 6. That is, the device is in the retracted state, the sling is suspended on the double-headed hook 6, the extension plate 7 is in the folded state of being flipped upward, the movable plate 8 is in the oblique state, and the movable plate 8 is completely located below the support plate 4. At this time, the cylinder 10 is in the minimum stroke, and the radial sliding pin 1101 is in the second straight groove 9013 on the inner wall of the auxiliary cylinder 9.

[0053] Lifting mode two, such as Figure 3As shown: When a component requires multiple slings to ensure balance during hoisting, simply install the additional slings on the second lifting ring 15. Use the second lifting ring 15 to assist in the balanced movement of the component. That is, the device is in the folded state of the extension plate 7, the movable plate 8 extends out of the support plate 4, and the slings are suspended on the second lifting ring 15. When switching hoisting modes, the cylinder 10 is started by the external controller. The cylinder 10 outputs vertically to drive the drive rod 11 to rise. The radial sliding pin 1101 on the outer wall of the drive rod 11 slides along the deflection groove 901 on the inner wall of the auxiliary cylinder 9. That is, the radial sliding pin 1101 passes through the second straight groove 9013, the arc groove 9012, and the first straight groove 9011 in sequence. When the radial sliding pin 1101 rotates along the arc groove 9012, the auxiliary cylinder 9 rotates around the axis, thereby driving the movable plate 8 to rotate 45°, so that the movable plate 8 gradually turns from an inclined position to an upright position. At this time, the free end of the movable plate 8 rotates outward and exceeds the support plate. 4; Moreover, during the upward movement of the drive rod 11, the limiting plate 12 and the limiting block 13 at the top of the drive rod 11 move upward synchronously and extend out of the slot 402. The limiting blocks 13 at both ends of the limiting plate 12 cooperate with the limiting groove 702 at the free end of the extension plate 7 to lock the extension plate 7, further ensuring the stability of the extension plate 7 during use. During this process, the limiting pin 401 on the bottom surface of the support plate 4 slides along the limiting arc groove 802 on both sides of the movable plate 8. The arc of the limiting arc groove 802 is consistent with the rotation angle of the movable plate 8, further limiting the rotation angle of the movable plate 8. The hoisting mode switching is completed.

[0054] Lifting mode three, such as Figure 1 As shown: When further expansion is needed, the extension plate 7 opens, i.e., the extension plate 7 is in a folded-down unfolded state. The movable plate 8 extends beyond the fixed plate 3 to assist in supporting the extension plate 7. The sling is suspended on the third lifting ring 14, and the third lifting ring 14 is used to assist in the balanced movement of the components. When switching the lifting mode, firstly, the output end of the control cylinder 10 descends, the limit block 13 descends and moves out of the limit groove 702, the lock of the extension plate 7 is released, the extension plate 7 is folded down to a horizontal state, the vertical output of the control cylinder 10 drives the drive rod 11 to rise, and the movable plate 8 extends out and supports the bottom surface of the extension plate 7. The radial sliding pin 1101 slides along the deflection groove 901 on the inner wall of the auxiliary cylinder 9. When the radial sliding pin 1101 passes through the arc groove 9012, the auxiliary cylinder 9 rotates around the axis, thereby driving the movable plate 8 to rotate 45°, so that the movable plate 8 gradually changes from an inclined position to an upright position, and the movable plate 8 extends out to support the extension plate 7. During the upward movement of the drive rod 11, the positioning plate 16 is simultaneously moved along the thickness direction within the positioning sliding hole 803. When the radial sliding pin 1101 passes through the first straight groove 9011, the positioning pins 17 at both ends of the positioning plate 16 extend from the upper surface of the movable plate 8 and cooperate with the positioning pin holes 703 on the surface of the extension plate 7 to achieve the position limitation of the extension plate 7.

[0055] After use, the sling is removed, the cylinder 10 drives the drive rod 11 to descend, the radial sliding pin 1101 slides in the opposite direction along the deflection groove 901, that is, the radial sliding pin 1101 passes through the first straight groove 9011, the arc groove 9012 and the second straight groove 9013 in sequence, the positioning pin 17 disengages from the positioning pin hole 703, the movable plate 8 rotates from the upright position back to the inclined position and rotates completely to the bottom of the support plate 4, and the extension plate 7 can be folded to the retracted state.

[0056] The multi-point hoisting mode increases the load-bearing points and expands the lever arm by extending plate 7. Combined with reasonable sling suspension positions, it effectively prevents problems such as cracking of precast slab structures, edge damage, or internal stress concentration caused by uneven lifting force or loss of control of single-point hoisting posture. Under the premise of ensuring safety and feasibility, it minimizes the number of slings used and reduces the physical exertion and preparation workload of workers.

[0057] When the angle of the double-headed hook 6 needs to be adjusted, the motor 20 on the lower surface of the fixing plate 3 is started by the external controller. The gear 21 at the output end of the motor 20 meshes with the gear ring 19 on the outer surface of the ring seat 18, causing the ring seat 18 to rotate in the annular groove 301 of the fixing plate 3 through the bearing. The ring seat 18 is rigidly connected to the hook handle of the double-headed hook 6 through the linkage 22, thereby causing the double-headed hook 6 to rotate to adjust the angle.

[0058] The scope of protection claimed by this invention is not limited to the specific embodiments described above. Moreover, for those skilled in the art, this invention can have various modifications and alterations. Any modifications, improvements, and equivalent substitutions made within the concept and principles of this invention should be included within the scope of protection of this invention.

Claims

1. An auxiliary hoisting device for bridge construction, characterized in that, Includes a support plate (4), with a first lifting ring (1) in the middle of the upper end surface of the support plate (4), and extension plates (7) hinged to both ends of the support plate (4), with a third lifting ring (14) vertically fixed to the free end of the extension plate (7). A fixing plate (3) is fixed below the support plate (4) by a pair of support blocks (2). A concave frame (5) is installed in the center of the bottom surface of the fixing plate (3). A double-headed hook (6) is rotatably installed at the bottom end of the concave frame (5). A movable plate (8) is rotatably installed between the fixed plate (3) and the support plate (4). The movable plate (8) is driven by a cylinder (10) installed in the concave frame (5). A second lifting ring (15) is fixed to the free end of the movable plate (8). When the movable plate (8) is upright, the free end of the movable plate (8) extends outward and exceeds the support plate (4) to support the extension plate (7). When the movable plate (8) is tilted, the movable plate (8) is completely below the support plate (4).

2. The auxiliary hoisting equipment for bridge construction according to claim 1, characterized in that, The concave cavity of the concave frame (5) is equipped with a cylinder (10) that is adjusted by an external controller, and the output end of the cylinder (10) is fixedly connected to a vertical drive rod (11). The outer wall of the drive rod (11) is provided with a radial sliding pin (1101). The radial sliding pin (1101) is slidably installed in the deflection groove (901) on the inner wall of the auxiliary cylinder (9). The deflection groove (901) includes a first straight groove (9011), an arc groove (9012), and a second straight groove (9013) connected in sequence. The auxiliary cylinder (9) is rotatably installed in the center of the support plate (4) and its bottom is fixed in the center of the movable plate (8).

3. The auxiliary hoisting equipment for bridge construction according to claim 2, characterized in that, The movable plate (8) has a positioning sliding hole (803) in the center along the length direction. A positioning plate (16) that moves along the thickness direction of the movable plate (8) is installed in the positioning sliding hole (803). The center of the positioning plate (16) is rotatably mounted on the drive rod (11). Positioning pins (17) are fixed on the upper surfaces of both ends of the positioning plate (16). When the positioning plate (16) is in a high position, the positioning pins (17) are higher than the upper surface of the movable plate (8) and cooperate with the positioning pin holes (703) opened on the surface of the extension plate (7).

4. The auxiliary hoisting equipment for bridge construction according to claim 1, characterized in that, The bottom surface of the support plate (4) is symmetrically provided with a limiting pin (401), and the two sides of the movable plate (8) are provided with limiting arc grooves (802). The limiting pin (401) passes through the limiting arc groove (802), and when the movable plate (8) rotates, the limiting pin (401) slides synchronously with the arc surface of the limiting arc groove (802) to limit the rotation angle of the movable plate (8).

5. The auxiliary hoisting equipment for bridge construction according to claim 2, characterized in that, The top of the drive rod (11) passes through the support plate (4) and is fixedly connected to the limiting plate (12). The limiting plate (12) is located between the two bottom fixed ends of the first lifting ring (1). The two ends of the limiting plate (12) are integrally connected to the limiting blocks (13). The limiting blocks (13) cooperate with the limiting groove (702) at the free end of the extension plate (7). The limiting groove (702) and the third lifting ring (14) are located on the two sides of the extension plate (7).

6. The auxiliary hoisting equipment for bridge construction according to claim 5, characterized in that, The extension plate (7) is located on the back side of the third lifting ring (14) and has a clearance notch (701) of the limiting plate (12), and the limiting groove (702) is located at the edge of the clearance notch (701).

7. The auxiliary hoisting equipment for bridge construction according to claim 1, characterized in that, The lower surface of the fixing plate (3) has a concentric annular groove (301), and a ring seat (18) is rotatably installed in the annular groove (301). The ring seat (18) is rigidly connected to the hook handle of the double-headed hook (6) through a linkage (22). A toothed ring (19) is fixedly provided on the outer surface of the ring seat (18). The lower surface of the fixing plate (3) is located outside the annular groove (301) and a motor (20) is installed thereon, which is adjusted by an external controller. The output end of the motor (20) is equipped with a gear (21) that meshes with the gear ring (19). The gear (21) is installed in the slot that connects the fixing plate (3) and the annular groove (301).

8. The auxiliary hoisting equipment for bridge construction according to claim 7, characterized in that, The linkage component (22) includes a linkage block (2203) installed on the inner wall of the ring seat (18). The lower surface of the linkage block (2203) is fixedly connected to the linkage plate (2201) through the linkage rod (2202). The mounting surface of the linkage plate (2201) is fixed to the outer wall of the hook handle of the double-headed hook (6).

9. The auxiliary hoisting equipment for bridge construction according to claim 5, characterized in that, The upper surface of the support plate (4) is provided with a slot (402) that allows the limiting plate (12) to be embedded, and the drive rod (11) passes through the center of the slot (402).

10. The auxiliary hoisting equipment for bridge construction according to claim 2, characterized in that, The auxiliary cylinder (9) rotates 45°~90° relative to the radial sliding pin (1101).

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