Intelligent control electric rotating spreader of large-span bridge erecting machine of wharf and use method thereof

Abstract

The application discloses a kind of wharf large-span bridge erecting machine intelligent regulation and control electric rotary hanger and its use method, the intelligent regulation and control electric rotary hanger includes the hanger beam installed on bridge erecting machine, hanger beam is fixed with protective box body, rotary hanger component is rotatably installed below protective box body, power equipment is fixed on the upper surface of protective box body, and the output end of power equipment is connected with rotary hanger component by main shaft;Lower limit disc is fixed coaxially outside main shaft, guide slide rail is fixed in the inner wall of protective box body, and mobile base is slidably connected longitudinally on guide slide rail, upper limit disc is rotatably installed on mobile base, and anti-rotation mechanism for limiting the rotation position of main shaft is arranged between lower limit disc and upper limit disc;The rotary hanger is through pre-speed reduction, accurate alignment, rigid locking three-stage collaborative structure, to avoid inertia impact and positioning deviation problem of rotary hanger under heavy load large inertia condition, without manual fine adjustment, it can realize the intelligent accurate regulation and control of hanger rotation angle.

Description

Technical Field

[0001] This invention relates to the field of rotating spreader technology for bridge erecting machines, specifically to an intelligent controllable electric rotating spreader for a large-span bridge erecting machine at a wharf and its usage method. Background Technology

[0002] As the core equipment for erecting long-span bridges at wharves, the bridge erecting machine is equipped with an electric rotating spreader mainly used to lift, transport, and precisely adjust the angle of precast beams. Most existing bridge erecting machines at wharves use a motor-driven slewing bearing structure, which directly drives the spreader components to rotate through the main shaft, meeting the basic posture adjustment requirements during beam hoisting.

[0003] For example, patent CN112225061A discloses an all-around rotating and adjustable lifting device for a bridge erecting machine, including a lifting beam. The bottom ends of the left and right end plates of the lifting beam are hinged to a lower lifting connecting seat via a hinge shaft. One end of the lower lifting connecting seat is hinged to the end of the push rod of a side adjusting cylinder via a hinge shaft. The cylinder body end of the side adjusting cylinder is hinged to the left or right end plate of the lifting beam via a hinge shaft. It can rotate the lifting beam horizontally and tilt it vertically. Moreover, the lower lifting connecting seat can be tilted in the front and back directions, thereby meeting different lifting and installation requirements and changing the lifting and placement state of the lifted items to meet different lifting and installation requirements.

[0004] For example, patent CN121717268A discloses a rotating lifting device and construction method for a bridge erecting machine. The rotating lifting device includes an upper lifting beam and a lower lifting beam. The upper lifting beam is connected to the lower lifting beam through an adaptive flexible lifting device. The two ends of the upper lifting beam are used to connect to a lifting trolley respectively. The lower lifting beam is used to connect to the cap beam. The adaptive flexible lifting device includes an arc-shaped lower sliding plate and an arc-shaped upper sliding plate. The lower sliding plate is fixed on the upper lifting beam, and the upper sliding plate is located above the lower sliding plate. The arc-shaped surfaces of the lower sliding plate and the upper sliding plate are in contact with each other and slide relative to each other. A through hole is provided in the center of the lower sliding plate, and multiple flexible spiral cables pass through the through hole. One end of the flexible spiral cable is fixedly connected to the upper sliding plate, and the other end of the flexible spiral cable is connected to the lower sliding plate through a lifting cage.

[0005] However, some existing electric slewing devices, under heavy load and high inertia conditions, use direct braking after the device has rotated to the correct position. This can easily generate a large inertial impact, causing rotational positioning deviations. Manual fine-tuning is required to calibrate the device's rotational position. In addition, the device lacks a reliable anti-rotation locking structure after braking, making it prone to accidental rotation under sea breeze disturbances and load eccentricity, which affects the safety and stability of lifting operations.

[0006] To address the aforementioned issues, there is an urgent need for innovative design based on the existing rotating lifting device for bridge erecting machines. Summary of the Invention

[0007] The purpose of this invention is to provide an intelligent control electric rotating spreader for large-span bridge erecting machines at wharves and its usage method, in order to solve the problems mentioned in the background art. In some existing electric rotating spreaders, under heavy load and large inertia conditions, the spreader adopts a direct braking method after rotating into position, which is prone to generating large inertial impacts and causing rotational positioning deviations. Manual fine-tuning is required to calibrate the spreader's rotational position. At the same time, the spreader lacks a reliable anti-rotation locking structure after braking, and is prone to accidental rotation under sea wind disturbances and load eccentricity, affecting the safety and stability of lifting operations.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A smart control electric rotating spreader for a large-span bridge erecting machine at a wharf includes a spreader beam installed on the bridge erecting machine, a protective housing fixed on the spreader beam, a rotating spreader component rotatably installed below the protective housing, a power device fixed on the upper surface of the protective housing, the output end of the power device being connected to the rotating spreader component via a main shaft, the main shaft being rotatably installed in the protective housing; a lower limiting plate is coaxially fixed to the outside of the main shaft, a guide rail is fixed to the inner wall of the protective housing, a movable base is longitudinally slidably connected to the guide rail, an upper limiting plate is rotatably installed on the movable base, an anti-rotation mechanism for limiting the rotation position of the main shaft is provided between the lower and upper limiting plates; an inner groove and a circular groove are coaxially formed on the upper limiting plate, the upper limiting plate maintains a radial clearance with the outer wall of the main shaft through the circular groove, and two sets of speed limiting rings are rotatably installed in the inner groove of the upper limiting plate; the upper limiting plate is also provided with a transmission module that autonomously controls the rotation of the speed limiting rings and makes frictional contact with the outside of the main shaft.

[0010] Preferably, the anti-rotation mechanism includes an upper toothed ring fixed on the upper limiting plate and a lower toothed ring fixed on the lower limiting plate, wherein the upper toothed ring moves down and engages with the lower toothed ring.

[0011] Preferably, a cylinder is fixed inside the protective housing, and the output end of the cylinder is fixedly connected to the movable base.

[0012] Preferably, multiple sets of correction and positioning modules are circumferentially and equidistantly installed below the upper limiting plate. The correction and positioning modules are used to correct the meshing position of the upper and lower toothed rings.

[0013] Preferably, the correction and positioning module includes a guide post fixed to the bottom of the upper limiting plate, a positioning rod axially telescopically connected to the guide post, a slider fixed on the positioning rod, the slider slidably mounted on the guide post, and a return spring elastically connected between the positioning rod and the guide post; multiple positioning holes are equidistantly opened on the upper surface of the lower limiting plate, and the positioning rod moves down and engages with the positioning holes.

[0014] Preferably, the transmission module includes a transmission component that is radially slidably mounted on the upper limiting plate, and a push rod is rotatably connected to one end of the transmission component located inside the upper limiting plate; a protrusion is fixed to the outside of the speed limiting ring, and the protrusion is rotatably connected to the push rod.

[0015] Preferably, the transmission component has a through groove, and a cylindrical rod is fixed in the through groove; a fixing plate is fixed on the upper limiting plate, the transmission component is slidably mounted on the fixing plate through the through groove, and the cylindrical rod slides through the fixing plate, and a limit spring is elastically connected between the fixing plate and the transmission component.

[0016] Preferably, a hollow base is fixed to the inner wall of the protective box, and the hollow base is coaxially sleeved on the outside of the lower limiting plate; the hollow base is provided with an initial channel, a sloping channel and a limiting channel in sequence from top to bottom along the axis, and the arc end face of the transmission component is in close contact with the inner wall of the hollow base.

[0017] Preferably, the speed limiting ring has a stepped groove, in which a speed limiting block is slidably installed, and a gap is reserved between the speed limiting block and the inner wall of the stepped groove.

[0018] A protruding rod is fixed on the speed limiter block, and the protruding rod slides through the speed limiter ring; a column is axially fixed on the positioning rod, and the position of the column corresponds to the arc surface of the protruding rod; multiple protruding rings are circumferentially fixed at equal intervals on the lower limiting plate, and the positions of the protruding rings correspond to the positions of the positioning holes.

[0019] A method for using an intelligent control electric rotating spreader for a large-span bridge erecting machine at a wharf, the method comprising the following steps:

[0020] S1. The operating power equipment drives the main shaft to rotate the rotating lifting device to a preset angle, and the main shaft synchronously drives the lower limiting disc to rotate to the target position.

[0021] S2. When the spindle rotates more than half the preset angle of travel, the drive moving base and the upper limiting plate move downward along the guide rail, and the transmission module drives the speed limiting ring to make frictional contact with the outer wall of the spindle to achieve spindle deceleration and braking.

[0022] S3. The upper limit plate continues to move downward, and the correction and positioning module corrects the circumferential angle of the upper limit plate relative to the lower limit plate, completing the alignment and correction of the anti-rotation mechanism.

[0023] S4. After the main shaft stops rotating, the anti-rotation mechanism locks the main shaft, and the rotating lifting device maintains a fixed posture, completing intelligent control and positioning.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] The electric rotating spreader uses a speed-limiting ring and transmission module that can be controlled autonomously within the upper limiting plate. When the spreader has rotated halfway, friction deceleration is automatically triggered. The deceleration process is smooth and gradual, allowing the main shaft to slowly reduce its speed before rotating to the preset angle. This reduces the inertial impact on the main shaft and the rotating spreader components, avoiding problems such as rotation angle deviation and lifting sway caused by sudden stops. It can be positioned in one go without repeated manual fine-tuning, improving the rotation positioning accuracy and operating efficiency of the large-span bridge erecting machine at the dock.

[0026] The upper and lower toothed rings mesh with each other to form a rigid anti-rotation mechanism. After locking, there is no slippage, displacement, or rebound. It can resist external force interference caused by sea wind disturbance, load imbalance, and construction vibration. Its locking torque is large and its holding capacity is strong, which can ensure that the rotating lifting equipment components are stable and do not deviate in the heavy-load suspension state, greatly improving the safety of high-altitude lifting operations at the dock.

[0027] Multiple sets of correction and positioning modules are set below the upper limiting plate. Together with the positioning rod, positioning hole and guide column structure, the circumferential angle is automatically corrected before the upper toothed ring and the lower toothed ring are engaged. This ensures that the locking mechanism is always in a precise centering state, avoiding situations such as tooth popping, jamming and incomplete engagement when the rotating spreader is locked. This adapts to high-frequency and high-intensity dock construction conditions.

[0028] A sliding speed limiter block is fitted into the speed limiter ring. During the rotation of the speed limiter ring and its contact with the main shaft, when the alignment and positioning module contacts the surface of the convex ring, it pushes the positioning rod and the column upward. The column moves upward and contacts the outer arc end face of the convex rod, exerting a squeezing effect on the convex rod. The convex rod drives the speed limiter block to move slightly laterally within the speed limiter ring. At this time, the speed limiter block moves outward within the speed limiter ring, intensifying the squeezing friction with the surface of the main shaft. This allows the main shaft speed to be further reduced during the alignment process, maintaining stable rotation and stopping of the main shaft, and improving the accuracy of intelligent control of the electric rotary lifting device. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the rotating lifting device component of the present invention.

[0030] Figure 2 This is a schematic diagram of the cross-sectional structure of the protective box of the present invention.

[0031] Figure 3 This is a schematic diagram of the main shaft structure of the present invention.

[0032] Figure 4 This is a schematic diagram of the movable base structure of the present invention.

[0033] Figure 5 This is a schematic diagram of the lower and upper limiting disks of the present invention.

[0034] Figure 6 This is a schematic diagram of the upper toothed ring structure of the present invention.

[0035] Figure 7 This is a schematic diagram of the speed limiting ring structure of the present invention.

[0036] Figure 8 This is a schematic diagram of the transmission component structure of the present invention.

[0037] Figure 9 This is a schematic diagram of the speed limiter block structure of the present invention.

[0038] Figure 10 This is a schematic diagram of the upper limiting disk structure of the present invention.

[0039] Figure 11 This is a schematic diagram of the limiting spring structure of the present invention.

[0040] Figure 12 This is a schematic diagram of the positioning rod structure of the present invention.

[0041] Figure 13 This is a schematic diagram of the lower toothed ring structure of the present invention.

[0042] Figure 14 This is a schematic diagram of the column structure of the present invention.

[0043] In the diagram: 1. Lifting beam; 2. Protective housing; 3. Rotating lifting device component; 4. Power equipment; 5. Main shaft; 6. Lower limiting plate; 7. Guide rail; 8. Moving base; 81. Cylinder; 9. Upper limiting plate; 91. Embedded groove; 92. Circular groove; 10. Upper gear ring; 11. Lower gear ring; 12. Transmission module; 121. Transmission component; 1211. Through groove; 1212. Cylindrical rod; 1213. Fixing plate; 121 4. Limiting spring; 122. Push rod; 123. Protrusion; 13. Speed ​​limiting ring; 14. Hollow base; 141. Initial channel; 142. Inclined groove channel; 143. Limiting channel; 15. Correction and positioning module; 151. Guide post; 152. Positioning rod; 153. Slider; 154. Return spring; 155. Column; 16. Positioning hole; 17. Protruding ring; 18. Step groove; 19. Speed ​​limiting block; 20. Protruding rod. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] Example 1: Please refer to Figure 1 - Figure 7The present invention provides the following technical solution: an intelligent controllable electric rotating spreader for a large-span bridge erecting machine at a wharf, comprising a spreader beam 1 installed on the bridge erecting machine, a protective housing 2 fixed on the spreader beam 1, a rotating spreader component 3 rotatably installed below the protective housing 2, a power device 4 fixed on the upper surface of the protective housing 2, the output end of the power device 4 being connected to the rotating spreader component 3 via a main shaft 5, the main shaft 5 being rotatably installed in the protective housing 2; a lower limiting plate 6 coaxially fixed to the outside of the main shaft 5, and a guide rail 7 fixed to the inner wall of the protective housing 2, guiding... A movable base 8 is longitudinally slidably connected to the slide rail 7. An upper limiting disk 9 is rotatably mounted on the movable base 8. An anti-rotation mechanism for limiting the rotation position of the main shaft 5 is provided between the lower limiting disk 6 and the upper limiting disk 9. An inner groove 91 and a circular groove 92 are coaxially opened on the upper limiting disk 9. The upper limiting disk 9 maintains a radial clearance with the outer wall of the main shaft 5 through the circular groove 92. Two sets of speed limiting rings 13 are rotatably mounted in the inner groove 91 of the upper limiting disk 9. The upper limiting disk 9 is also provided with a transmission module 12 that autonomously controls the rotation of the speed limiting rings 13 and makes frictional contact with the outside of the main shaft 5.

[0046] According to the required rotation angle of the workpiece hoisting, the rotation angle of the main shaft 5 is preset on the control system that controls the start and stop of the power equipment 4. The power equipment 4 serves as the rotation drive source, directly driving the rotating lifting device 3 to perform circumferential rotation adjustment through the main shaft 5. The lower limiting plate 6 rotates synchronously with the main shaft 5, providing a reference structure for anti-rotation and positioning. When the main shaft 5 rotates to half the preset angle, the control of the moving base 8 to perform longitudinal lifting and lowering movement along the guide rail 7 drives the upper limiting plate 9 to approach the lower limiting plate 6. When the main shaft 5 stops rotating, the anti-rotation mechanism between the upper limiting plate 9 and the lower limiting plate 6 engages, limiting the rotation angle of the main shaft 5 at this time to prevent the main shaft 5 from rotating under the action of sea wind or inertia.

[0047] The anti-rotation mechanism can smoothly reduce the speed of the main shaft 5, keeping the rotating lifting device stable and stopped. The anti-rotation mechanism works in conjunction with the speed limiting ring 13 to first reduce the speed of the main shaft 5, and then lock the main shaft 5 after it stops rotating. The speed limiting ring 13 is installed in the inner groove 91 of the upper limiting plate 9. Under the drive of the transmission module 12, it can rotate autonomously in the direction of the main shaft 5 and form frictional contact (the transmission module 12 moves downward synchronously with the upper limiting plate 9. During its downward movement, it can autonomously drive the speed limiting ring 13 to rotate and rub against the inner wall of the hollow base 14). (Outside the main shaft 5), the speed limiting ring 13 achieves smooth deceleration of the main shaft 5 through friction. The circular groove 92 provides clearance for the movement of the speed limiting ring 13 (the speed limiting ring 13 rotates and fits against the outer surface of the main shaft 5), avoiding rigid interference with the main shaft 5. After the speed limiting ring 13 rotates and comes into contact with the main shaft 5, it reduces the speed of the second half of the rotation stroke of the main shaft 5, keeping the main shaft 5 rotating slowly to a stop. This avoids the main shaft 5 from being deflected by a large inertial force when it stops suddenly under heavy load, and improves the accuracy of the rotation adjustment position of the main shaft 5 and the rotating lifting device component 3.

[0048] Please see Figure 5 and Figure 6 The anti-rotation mechanism includes an upper toothed ring 10 fixed on the upper limiting plate 9 and a lower toothed ring 11 fixed on the lower limiting plate 6. The upper toothed ring 10 moves down and engages with the lower toothed ring 11.

[0049] The upper gear ring 10 moves synchronously with the upper limiting disk 9, and the lower gear ring 11 rotates synchronously with the lower limiting disk 6 and the main shaft 5. When the upper limiting disk 9 drives the upper gear ring 10 to move downward and meshes with the lower gear ring 11, the upper gear ring 10 and the lower gear ring 11 form a circumferential rigid constraint, which completely locks the rotation position of the main shaft 5, preventing the rotating lifting device 3 from rotating unexpectedly under heavy load, wind load or external force disturbance, and achieving a reliable anti-rotation positioning effect.

[0050] Please see Figure 3 and Figure 4 A cylinder 81 is fixed inside the protective housing 2, and the output end of the cylinder 81 is fixedly connected to the movable base 8.

[0051] The cylinder 81 provides a power source for the longitudinal movement of the movable base 8 and the upper limiting plate 9. Through the extension and retraction of the cylinder 81, the movable base 8 is driven to rise and fall stably along the guide rail 7, thereby controlling the vertical displacement of components such as the upper limiting plate 9, the speed limiting ring 13, and the upper gear ring 10, realizing the sequential drive of actions such as deceleration, alignment, and locking, and ensuring the synchronicity and stability of the mechanism's actions.

[0052] Please see Figure 5 and Figure 6 Multiple sets of correction and positioning modules 15 are installed circumferentially at equal intervals below the upper limiting plate 9. The correction and positioning modules 15 are used to correct the meshing position of the upper toothed ring 10 and the lower toothed ring 11.

[0053] Multiple sets of correction and positioning modules 15 are evenly distributed around the upper limiting plate 9. Before the upper toothed ring 10 and the lower toothed ring 11 are about to mesh, the relative angle of their circumference is detected and corrected to ensure that the teeth of the upper toothed ring 10 and the tooth grooves of the lower toothed ring 11 are precisely aligned. This avoids problems such as tooth tipping, misalignment, and jamming during meshing, and ensures that the anti-rotation mechanism can smoothly and reliably complete the meshing and locking.

[0054] Please see Figure 12 - Figure 14 The correction and positioning module 15 includes a guide post 151 fixed to the bottom of the upper limiting plate 9. A positioning rod 152 is axially telescopically connected to the guide post 151. A slider 153 is fixed on the positioning rod 152. The slider 153 is slidably mounted on the guide post 151. A return spring 154 is elastically connected between the positioning rod 152 and the guide post 151. Multiple positioning holes 16 are equidistantly opened on the upper surface of the lower limiting plate 6. The positioning rod 152 moves down and engages with the positioning holes 16.

[0055] When the upper limiting plate 9 moves down, the positioning rod 152 moves down accordingly. When the positioning rod 152 contacts the upper surface of the lower limiting plate 6, under the elastic pressure of the return spring 154, the positioning rod 152 makes axial extension and retraction adaptive adjustment along the guide post 151. When the positioning rod 152 is aligned with the positioning hole 16, the positioning rod 152 quickly snaps into the positioning hole 16, completing the circumferential angle correction between the upper limiting plate 9 and the lower limiting plate 6. The slider 153 slides along the guide post 151 to guide and limit the movement of the positioning rod 152, ensuring that the positioning action is smooth and reliable. When the positioning rod 152 is engaged with the positioning hole 16, when the main shaft 5 drives the lower limiting plate 6 to rotate, the engaged positioning rod 152 and the positioning hole 16 can drive the upper limiting plate 9 to rotate synchronously, keeping the upper limiting plate 9 and the lower limiting plate 6 in a state of precise alignment.

[0056] Example 2: Please refer to Figure 7 and Figure 8 Based on Embodiment 1, a transmission module 12 is also disclosed. It is disclosed that when the upper limiting disk 9 moves down, the transmission module 12 moves down synchronously. The transmission module 12 contacts and presses against the inner wall of the hollow base 14, so as to achieve the purpose of autonomously driving the speed limiting ring 13 to rotate and rub against the main shaft 5. Its specific structure is as follows: The transmission module 12 includes a transmission component 121 that is radially slidably mounted on the upper limiting disk 9. One end of the transmission component 121 located inside the upper limiting disk 9 is rotatably connected to a push rod 122. A protrusion 123 is fixed on the outside of the speed limiting ring 13. The protrusion 123 is rotatably connected to the push rod 122.

[0057] The transmission component 121 can slide and extend radially along the upper limiting disk 9. When the transmission component 121 moves inward, the push rod 122 rotates between the transmission component 121 and the protrusion 123. The rotating push rod 122 drives the speed limiting ring 13 to rotate around the hinge axis connected to the upper limiting disk 9 through the protrusion 123, so that the speed limiting ring 13 moves closer to the main shaft 5 and forms frictional contact, reducing the rotational speed of the main shaft 5 before it stops. When the transmission component 121 returns to its original position, the speed limiting ring 13 separates from the main shaft 5 under the linkage action, releasing the frictional deceleration and realizing the mechanical linkage control of the speed limiting ring 13.

[0058] Please see Figure 11 The transmission component 121 has a through groove 1211, and a cylindrical rod 1212 is fixed in the through groove 1211. A fixing plate 1213 is fixed on the upper limiting plate 9. The transmission component 121 is slidably mounted on the fixing plate 1213 through the through groove 1211, and the cylindrical rod 1212 slides through the fixing plate 1213. A limit spring 1214 is elastically connected between the fixing plate 1213 and the transmission component 121.

[0059] The fixed plate 1213 provides an installation and sliding reference for the transmission component 121. The cylindrical rod 1212 cooperates with the through groove 1211 to precisely guide the radial movement of the transmission component 121 and prevent movement deviation. The limiting spring 1214 provides elastic restoring force for the transmission component 121. After the external drive is released, it can pull the transmission component 121 to automatically return to the initial position, driving the speed limiting ring 13 to reset synchronously, ensuring that the mechanism can work stably in cycles.

[0060] Please see Figure 9 and Figure 10 A hollow base 14 is fixed to the inner wall of the protective box 2. The hollow base 14 is coaxially sleeved on the outside of the lower limiting plate 6. The hollow base 14 has an initial channel 141, a sloping channel 142 and a limiting channel 143 opened sequentially from top to bottom along the axis. The arc end face of the transmission component 121 is in contact with the inner wall of the hollow base 14.

[0061] The hollow base 14 provides a radial movement reference for the transmission component 121. When the upper limiting disk 9 drives the transmission component 121 downward, the arc end face of the transmission component 121 first contacts the initial channel 141. At this time, the transmission component 121 is in the initial position. When it continues to descend and passes through the inclined channel 142, the inner wall of the inclined channel 142 squeezes the transmission component 121 to move radially inward, triggering the rotational deceleration action of the speed limiting ring 13. After entering the limiting channel 143, the transmission component 121 maintains the inner position, so that the speed limiting ring 13 continues to rub against the main shaft 5. The automatic triggering and holding of the deceleration action is realized through the channel structure.

[0062] Please see Figure 8 and Figure 9The speed limiting ring 13 has a stepped groove 18, and a speed limiting block 19 is fitted and slidably installed in the stepped groove 18, with a gap reserved between the speed limiting block 19 and the inner wall of the stepped groove 18.

[0063] The stepped groove 18 provides space for the installation and slight movement of the speed limiter 19. The speed limiter 19 can slide radially within the stepped groove 18. When the speed limiter 19 moves outward from the speed limiter ring 13, it directly contacts the outer wall of the main shaft 5 to form a friction deceleration surface, further reducing the speed of the main shaft 5. The reserved gap ensures that the speed limiter 19 can achieve radial fine adjustment under external triggering, changing the clamping force between it and the main shaft 5, thereby adjusting the magnitude of the deceleration torque and achieving graded and smooth deceleration control.

[0064] Please see Figure 9 - Figure 12 A protruding rod 20 is fixed on the speed limiting block 19, and the protruding rod 20 slides through the speed limiting ring 13; a column 155 is axially fixed on the positioning rod 152, and the position of the column 155 corresponds to the arc surface of the protruding rod 20; multiple protruding rings 17 are equidistantly fixed on the lower limiting plate 6, and the positions of the protruding rings 17 correspond to the positions of the positioning holes 16.

[0065] Before the positioning rod 152 is inserted into the positioning hole 16, it will first contact the surface of the convex ring 17 and be pushed upward, causing the column 155 to move upward synchronously. When the column 155 moves upward, it squeezes the arc end face of the convex rod 20, pushing the convex rod 20 and the speed limiting block 19 to move slightly towards the main shaft 5, increasing the pressing friction between the speed limiting block 19 and the main shaft 5. While aligning and correcting, it further enhances the deceleration effect, so that the main shaft 5 stops rotating quickly and smoothly, improving the positioning accuracy and locking reliability.

[0066] Example 3: Based on Examples 1 and 2, a method for using an intelligent controllable electric rotating spreader for a large-span bridge erecting machine at a wharf is also disclosed. The method for using the electric rotating spreader includes the following steps:

[0067] S1. The power equipment 4 drives the main shaft 5 to rotate the rotating lifting device 3 to a preset angle, and the main shaft 5 simultaneously drives the lower limiting disk 6 to rotate to the target position.

[0068] S2. When the spindle 5 rotates more than half the preset angle of travel, the driving movable base 8 and the upper limiting disk 9 move downward along the guide rail 7, and the transmission module 12 drives the speed limiting ring 13 to make frictional contact with the outer wall of the spindle 5, thereby realizing the deceleration and braking of the spindle 5.

[0069] S3. The upper limiting plate 9 continues to move downward, and the correction and positioning module 15 corrects the circumferential angle of the upper limiting plate 9 relative to the lower limiting plate 6, thus completing the alignment and correction of the anti-rotation mechanism.

[0070] S4. After the main shaft 5 stops rotating, the anti-rotation mechanism locks the main shaft 5, and the rotating lifting device 3 maintains a fixed posture, completing intelligent control and positioning.

[0071] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0072] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A smart controllable electric rotating spreader for a large-span bridge erecting machine at a wharf, comprising a spreader beam (1) installed on the bridge erecting machine, a protective housing (2) fixed on the spreader beam (1), and a rotating spreader component (3) rotatably installed below the protective housing (2), characterized in that: The upper surface of the protective box (2) is fixed with a power device (4). The output end of the power device (4) is connected to the rotating lifting device (3) through the main shaft (5). The main shaft (5) is rotatably installed in the protective box (2). The main spindle (5) is coaxially fixed with a lower limiting plate (6), and the inner wall of the protective housing (2) is fixed with a guide rail (7). A movable base (8) is longitudinally slidably connected to the guide rail (7), and an upper limiting plate (9) is rotatably mounted on the movable base (8). An anti-rotation mechanism for limiting the rotation position of the main spindle (5) is provided between the lower limiting plate (6) and the upper limiting plate (9). The upper limiting plate (9) is coaxially provided with an inner groove (91) and a circular groove (92). The upper limiting plate (9) maintains a radial gap with the outer wall of the main shaft (5) through the circular groove (92). Two sets of speed limiting rings (13) are rotatably installed in the inner groove (91) of the upper limiting plate (9). The upper limiting plate (9) is also provided with a transmission module (12) that autonomously controls the rotation of the speed limiting rings (13) and makes frictional contact with the outside of the main shaft (5).

2. The intelligent controllable electric rotating spreader for a large-span bridge erecting machine at a wharf according to claim 1, characterized in that: The anti-rotation mechanism includes an upper toothed ring (10) fixed on the upper limiting plate (9) and a lower toothed ring (11) fixed on the lower limiting plate (6). The upper toothed ring (10) moves down and meshes with the lower toothed ring (11).

3. The intelligent controllable electric rotating spreader for a large-span bridge erecting machine at a wharf according to claim 1, characterized in that: A cylinder (81) is fixed inside the protective housing (2), and the output end of the cylinder (81) is fixedly connected to the movable base (8).

4. The intelligent controllable electric rotating spreader for a large-span bridge erecting machine at a wharf, as described in claim 2, is characterized in that: Multiple sets of correction and positioning modules (15) are installed circumferentially at equal intervals below the upper limiting plate (9). The correction and positioning modules (15) are used to correct the meshing position of the upper toothed ring (10) and the lower toothed ring (11).

5. The intelligent controllable electric rotating spreader for a large-span bridge erecting machine at a wharf, as described in claim 4, is characterized in that: The correction and positioning module (15) includes a guide post (151) fixed to the bottom of the upper limiting plate (9), a positioning rod (152) axially telescopically connected in the guide post (151), a slider (153) fixed on the positioning rod (152), the slider (153) slidably mounted on the guide post (151), and a return spring (154) elastically connected between the positioning rod (152) and the guide post (151). The upper surface of the lower limiting plate (6) is provided with multiple positioning holes (16) at equal intervals in the circumference. The positioning rod (152) moves down and engages with the positioning holes (16).

6. The intelligent controllable electric rotating spreader for a large-span bridge erecting machine at a wharf, as described in claim 5, is characterized in that: The transmission module (12) includes a transmission component (121) that is radially slidably mounted on the upper limiting disk (9), and a push rod (122) is rotatably connected to one end of the transmission component (121) located inside the upper limiting disk (9). The speed limiting ring (13) has a protrusion (123) fixed on its outside, and the protrusion (123) is rotatably connected to the push rod (122).

7. The intelligent controllable electric rotating spreader for a large-span bridge erecting machine at a wharf, as described in claim 6, is characterized in that: The transmission component (121) has a through groove (1211), and a cylindrical rod (1212) is fixed in the through groove (1211). A fixing plate (1213) is fixed on the upper limiting plate (9). The transmission component (121) is slidably mounted on the fixing plate (1213) through the through groove (1211), and the cylindrical rod (1212) slides through the fixing plate (1213). A limit spring (1214) is elastically connected between the fixing plate (1213) and the transmission component (121).

8. The intelligent controllable electric rotating spreader for a large-span bridge erecting machine at a wharf according to claim 7, characterized in that: The inner wall of the protective box (2) is fixed with a hollow base (14), and the hollow base (14) is coaxially sleeved on the outside of the lower limiting plate (6); The hollow base (14) has an initial channel (141), a sloping channel (142) and a limiting channel (143) sequentially opened from top to bottom along the axis. The arc end face of the transmission component (121) is in contact with the inner wall of the hollow base (14).

9. The intelligent controllable electric rotating spreader for a large-span bridge erecting machine at a wharf, as described in claim 5, is characterized in that: The speed limiting ring (13) has a stepped groove (18), and a speed limiting block (19) is fitted and slidably installed in the stepped groove (18). A gap is reserved between the speed limiting block (19) and the inner wall of the stepped groove (18). A protruding rod (20) is fixed on the speed limiter block (19), and the protruding rod (20) slides through the speed limiter ring (13); A column (155) is axially fixed on the positioning rod (152), and the column (155) corresponds to the arc surface of the protrusion rod (20); The lower limiting plate (6) has multiple convex rings (17) fixed equidistantly around the circumference, and the positions of the convex rings (17) and the positioning holes (16) correspond to each other.

10. A method for using an intelligent controllable electric rotating spreader for a large-span bridge erecting machine at a wharf, used to execute the intelligent controllable electric rotating spreader for a large-span bridge erecting machine at a wharf as described in any one of claims 1 to 9, characterized in that, The method of using the electric rotating lifting device includes the following steps: S1. The running power equipment (4) drives the main shaft (5) to rotate the rotating lifting device (3) to a preset angle, and the main shaft (5) simultaneously drives the lower limiting disk (6) to rotate to the target position; S2. When the spindle (5) rotates more than half the preset angle, the driving moving base (8) and the upper limiting plate (9) move downward along the guide rail (7), and the transmission module (12) drives the speed limiting ring (13) to rub against the outer wall of the spindle (5) to achieve deceleration and braking of the spindle (5). S3. The upper limiting plate (9) continues to move downward, and the correction positioning module (15) corrects the circumferential angle of the upper limiting plate (9) relative to the lower limiting plate (6) to complete the alignment correction of the anti-rotation mechanism. S4. After the main shaft (5) stops rotating, the anti-rotation mechanism locks the main shaft (5), and the rotating lifting device (3) maintains a fixed posture, thus completing intelligent control and positioning.

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