A suspended conveying system for a carriage painting production line with anti-falling support device

Abstract

The present application relates to the field of carriage painting conveying, and discloses a hanging conveying system with anti-falling support device for carriage painting production line, which comprises a conveying track and a self-propelled trolley capable of running on the conveying track, the bottom of the self-propelled trolley is hung and conveys the carriage through a lifting appliance, and the bottom of the self-propelled trolley is provided with an anti-falling mechanism; the anti-falling mechanism comprises an anti-falling frame arranged below the self-propelled trolley; a turnover mechanism is arranged on the anti-falling frame, and the turnover mechanism is used for turning over the suspended carriage to expose the bottom surface of the carriage to the side surface for painting; the anti-falling mechanism and the turnover mechanism are matched to realize the protection of the carriage, and the turnover mechanism drives the whole anti-falling frame to tilt together with the carriage, so that the difficult-to-reach bottom of the carriage is changed into the easy-to-operate side surface position, the workers can complete the work without entering the bottom of the carriage, an open operation space is created, and intrinsic safety is realized.

Description

Technical Field

[0001] This invention relates to the field of car body painting and conveying, and more specifically to a suspended conveying system for a car body painting production line with a fall protection support device. Background Technology

[0002] In the field of heavy machinery manufacturing, such as the production of mining cars, painting is a crucial process. Currently, for painting such large workpieces, overhead conveyor systems are commonly used for transportation, and the work is usually carried out at specific painting stations.

[0003] Existing overhead conveyor systems mostly use self-propelled hoists or ordinary electric hoists running on tracks, moving the carriages by suspending them with a spreader. At the painting station, the top, sides, and bottom of the carriages need to be painted or coated with other protective materials. However, painting the top and sides of the carriages is relatively convenient because they are exposed; but painting the bottom of the carriages presents some difficulties; for example: Because the carriage is lifted off the ground, workers need to work from below, which not only severely restricts the operating space, leading to low painting efficiency and difficulty in guaranteeing quality, but also poses serious safety hazards. If the electric hoist malfunctions and causes the carriage to fall, the workers below will be placed in an extremely dangerous situation. Summary of the Invention

[0004] The purpose of this invention is to provide a suspended conveyor system for a car body painting production line with a fall protection support device, which solves the technical problem of difficult painting at the bottom of the car body and the inability to ensure safety.

[0005] The objective of this invention can be achieved through the following technical solutions: A suspended conveying system for a car body painting production line with a fall protection support device includes a conveying track and a self-propelled hoist trolley that can run on the conveying track. The bottom of the self-propelled hoist trolley is suspended and conveyed by a lifting device. The bottom of the self-propelled hoist trolley is equipped with a fall protection mechanism. The fall protection mechanism includes a fall protection frame, which is set below the self-propelled hoist trolley. The fall arrestor is equipped with a tilting mechanism, which is used to tilt the suspended carriage so that the bottom of the carriage is exposed to the side for painting.

[0006] Furthermore, fall protection mechanisms also include: Two symmetrically arranged inverted V-shaped connecting beams are fixedly mounted on the top of the fall arrestor. A through slot is provided at the middle of the top of the connecting beam. A suspension frame is provided on the top of the connecting beam. A through slot coaxial with the through slot is provided at the bottom of the suspension frame. The bottom of the suspension frame and the top of the connecting beam are connected by a connecting shaft. The connecting shaft includes a rectangular section and a cylindrical section. The rectangular section matches the through slot of the connecting beam, and the cylindrical section matches the through slot of the suspension frame. A limiting head is provided at one end of the connecting shaft. The top of the suspension frame is fixed to the self-propelled hoist, and the four corners of the bottom of the fall arrestor are equipped with wheels.

[0007] Furthermore, the flipping mechanism includes symmetrically distributed winding motors on both sides, with the winding shaft of the winding motor fixedly connected to one end of the corresponding steel cable, and the other end of the steel cable fixed to the bottom of the fall arrestor on the corresponding side; a reinforcing beam is fixed between the two suspension frames, and the winding motor is fixedly installed on the reinforcing beam. The steel cable is wound by a single-sided winding motor, which pulls the fall arrestor and the car body to tilt upwards on that side, thus changing the posture of the entire car body and fall arrestor from the original vertical posture to the tilted posture. After the bottom of the car body is painted, it returns to the original posture.

[0008] Furthermore, the suspension frame and the connecting beam are connected by a retractable assembly, which allows for switching between fixed and movable connection methods.

[0009] Furthermore, the forward and backward assembly includes a rectangular head, which is fixed to the end of the connecting shaft. The rectangular head extends out of the through groove and engages with a limiting sleeve fixed on the side of the suspension frame at the position corresponding to the rectangular head. In the initial state, the limiting sleeve is fitted onto the rectangular head to limit its movement. The limiting sleeve is also provided with an insert at the position near the end of the connecting shaft. When the limiting sleeve engages with the rectangular head, the insert is precisely embedded between the rectangular head and the side of the suspension frame. An automatic telescopic rod is also fixedly installed on the suspension frame. A limiting sleeve is fixed to the end of the automatic telescopic rod. A slot is opened at the bottom of the limiting sleeve for the rectangular head to enter. The automatic telescopic rod drives the lower limiting sleeve to rise and fall, so as to switch the state of the connecting shaft.

[0010] Furthermore, the system also includes multiple tensioning mechanisms that cooperate with the automatic telescopic rod; when the automatic telescopic rod retracts, it drives the tensioning mechanisms to tension the steel cable before activation; when the automatic telescopic rod extends, it drives the tensioning mechanisms to restore the slack of the steel cable.

[0011] Furthermore, each tensioning mechanism includes a pull rope and a tensioning lever. One end of the pull rope is fixed to the telescopic part of the automatic telescopic rod, and the other end is fixed to the connecting rod after passing over the guide wheel. The middle part of the tensioning lever is hinged to the reinforcing beam through a fulcrum shaft and a torsion spring, allowing the tensioning lever to swing around the fulcrum shaft. One end of the tensioning lever is the driving end, and the other end is the actuating end. An arc-shaped groove is provided on the driving end, and an arc-shaped groove with the same structure is also fixed to the side of the suspension frame through a bracket. The guide wheel is rotatably connected to the bracket, and the connecting rod is freely slidably inserted into the two arc-shaped grooves. A guide tensioning wheel is rotatably installed on the actuating end. When the automatic telescopic rod retracts, causing the limit sleeve to disengage from the rectangular head to allow for flipping, the end of the pull rope moves with the telescopic part of the automatic telescopic rod, pulling the connecting rod at the other end to slide within the two arc-shaped grooves, ultimately pushing the drive end to rotate the tension lever around the fulcrum axis; the actuator end of the tension lever then swings outward, pushing the guide tension wheel to swing outward a certain distance, thereby pressing the steel cable to the side, eliminating the transmission backlash before start-up and providing initial tension force for flipping; When the automatic telescopic rod extends and locks the rectangular head with the limit sleeve, the end of the pull rope moves in the opposite direction. Under the action of the fulcrum shaft and the torsion spring, the tension lever rotates in the opposite direction, and the actuator end of the tension lever swings inward, releasing the tension on the steel cable and restoring the steel cable to a slack state.

[0012] Furthermore, stabilizing components are installed on the crossbeams at the bottom of the fall arrestor to prevent the carriage from sliding laterally during overturning; The stabilizing component includes at least one set of arc-shaped grippers symmetrically distributed on both sides of the car body. The middle part of the arc-shaped grippers is hinged to the crossbeam by a torsion spring. One end of the arc-shaped gripper is located below the bottom of the car body, and the other end is provided with a limiting strip.

[0013] The beneficial effects of this invention are: (1) In order to solve the problem that traditional suspension systems only solve the problem of transportation, while the operation safety and space problem coexist during the painting of the bottom of the carriage, the present invention uses the anti-fall mechanism as the basic platform, so that it is no longer a passive protective facility, but an active carrier that participates in the execution of the process. The anti-fall frame acts as the last barrier against potential dangers during transportation, and transforms into the execution frame for the flipping action at the painting station, so that the heavy carriage is always in a state of being lifted or surrounded throughout the painting process. Even in extreme cases such as failure of the lifting equipment, the carriage will be reliably supported by the anti-fall frame, eliminating the threat to personnel from the carriage falling. At the same time, the flipping mechanism drives the entire anti-fall frame to tilt together with the carriage, turning the hard-to-reach bottom of the carriage into an easy-to-operate side position. Workers can complete the work without entering under the carriage, which not only creates a spacious operating space, but also achieves inherent safety.

[0014] (2) The present invention uses the forward and backward component as the mode switching switch of the system. Its locked state ensures the stability of the conveying process. When the unlocking command is issued, a series of chain reactions are automatically triggered: the rotational freedom of the connecting shaft is released, and the tension lever is driven by the mechanism to automatically tension the steel cable on the working side. The linkage mechanism of unlocking and tensioning ensures that there is no impact or delay when the flipping starts, and the action is smooth and accurate. Conversely, when the coating is completed and locking is required, the telescopic rod extends to push the limit sleeve to lock the connecting shaft, and simultaneously drives the tension lever to reset so that the steel cable is relaxed. This linkage of locking and relaxing not only ensures the stability of the conveying, but also avoids the fatigue and interference risks caused by the long-term tension of the steel cable. Attached Figure Description

[0015] The invention will now be further described with reference to the accompanying drawings.

[0016] Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 This is a partial explosion diagram of the present invention; Figure 3 Schematic diagram of the tensioning mechanism Figure 4 This is a structural diagram of the connecting shaft and the forward / reverse assembly; Figure 5 This is a schematic diagram of the structure of the stabilizing component.

[0017] Explanation of reference numerals in the attached drawings: 1. Conveying track; 2. Self-propelled hoist trolley; 3. Carriage; 4. Fall protection mechanism; 41. Fall protection frame; 42. Connecting beam; 43. Through slot; 44. Suspension frame; 45. Through slot; 46. Connecting shaft; 5. Tilting mechanism; 51. Winding motor; 52. Steel cable; 6. Reinforcing beam; 7. Forward and backward assembly; 71. Rectangular head; 72. Limiting sleeve; 73. Embedded part; 74. Automatic telescopic rod; 75. Slot; 8. Tensioning mechanism; 81. Pull rope; 82. Tensioning lever; 83. Pivot shaft; 84. Drive end; 85. Actuating end; 86. Arc-shaped slot; 87. Guide tensioning wheel; 88. Connecting rod; 89. Guide wheel; 9. Stabilizing assembly; 91. Arc-shaped gripper; 92. Limiting strip. Detailed Implementation

[0018] 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.

[0019] Please see Figures 1-5As shown, the present invention is a suspended conveying system for a car body painting production line with a fall protection support device; Example 1: like Figures 1-2 , Figure 4 As shown, the system includes a conveying track 1 and a self-propelled hoist 2 that can run on the conveying track 1. The bottom of the self-propelled hoist 2 is suspended and conveyed by a lifting device. The bottom of the self-propelled hoist 2 is equipped with a fall protection mechanism 4. The fall protection mechanism 4 includes a fall protection frame 41, which is located below the self-propelled hoist 2. The fall arrestor 41 is equipped with a flipping mechanism 5, which is used to flip the suspended carriage 3 so that the bottom of the carriage 3 is exposed to the side for painting.

[0020] Fall protection mechanism 4 also includes: Two symmetrically arranged inverted V-shaped connecting beams 42 are fixedly mounted on the top of the fall arrestor 41. A through slot 43 is provided at the middle of the top of the connecting beam 42. A suspension frame 44 is provided on the top of the connecting beam 42. A through slot 45 coaxial with the through slot 43 is provided at the bottom of the suspension frame 44. The bottom of the suspension frame 44 is connected to the top of the connecting beam 42 by a connecting shaft 46. The connecting shaft 46 includes a rectangular section and a cylindrical section. The rectangular section matches the through slot 43 of the connecting beam 42, and the cylindrical section matches the through slot 45 of the suspension frame 44. A limiting head is provided at one end of the connecting shaft 46. The top of the suspension frame 44 is fixed to the self-propelled hoist 2, and the four corners of the bottom of the fall arrestor 41 are equipped with wheels.

[0021] The flipping mechanism 5 includes a winding motor 51 symmetrically distributed on both sides. The winding shaft of the winding motor 51 is fixedly connected to one end of the steel cable 52 on the corresponding side, and the other end of the steel cable 52 is fixed to the bottom of the fall arrestor 41 on the corresponding side. A reinforcing beam 6 is fixed between the two suspension frames 44, and the winding motor 51 is fixedly installed on the reinforcing beam 6. The steel cable 52 is wound by a single-sided winding motor 51. The steel cable 52 pulls the fall arrestor 41 and the carriage 3 to flip upwards on that side, so that the posture of the entire carriage 3 and the fall arrestor 41 changes from the original vertical posture to the tilted posture. After the bottom of the carriage 3 is painted, it returns to the original posture.

[0022] In this invention, to address the issue that the mine car 3 is relatively heavy, when using an electric hoist suspension conveying system, especially when reaching the painting station of the car 3, painting the sides and top of the car 3 is relatively convenient. However, painting the bottom of the car 3 requires workers to enter for painting. On the one hand, the space is small, making the operation difficult for workers. On the other hand, if the hoisted car 3 falls accidentally, the workers working below will be in great danger. Therefore, a fall protection mechanism 4 is set up to protect the car 3 during the painting process. Even if the car 3 falls, it will be supported by the fall protection mechanism 4, thereby protecting the safety of workers and ensuring the smooth painting of the car 3. Specifically, both the conveyor rail 1 and the self-propelled hoist 2 are existing mature technologies that can be directly adopted. The self-propelled hoist 2 moves on the conveyor rail 1, thereby driving the hoisting movement. The hoisting points can be set according to the specific structure of the main beam of the carriage 3. For example, a four-corner fixed-point hoisting method can be used. As long as the self-propelled hoist 2 can be used to hoist and transport the carriage 3 up and down, it is acceptable. The anti-fall frame 41 in the anti-fall mechanism 4 has a hollow design in the middle. A crossbeam is set at the bottom of the anti-fall frame 41 to prevent the carriage 3 from falling. The structure in the middle of the anti-fall frame 41 allows the carriage 3 to be raised and lowered freely under the traction of the self-propelled hoist 2. To increase the worker's operating space, a flipping mechanism 5 is installed. This mechanism flips the fall arrestor 41 and the carriage 3, tilting the bottom of the carriage 3 to one side, thus increasing the exposure of the bottom. This is more convenient than traditional painting methods. The flipping mechanism 5 changes whether the fall arrestor 41 is in a fixed or movable state, thereby causing the carriage 3 to flip. Specifically, the fall arrestor 41 is installed onto the suspension frame 44 fixed to the bottom of the bicycle hoist as needed. When installation is required, first align the through slot 43 on the connecting beam 42 of the fall arrestor 41 with the through slot 45 on the suspension frame 44. Then, insert the T-shaped connecting shaft 46 outward from the connecting beam 42. Because the part of the connecting shaft 46 near the connecting beam 42 is rectangular, while the outer part is cylindrical, after inserting the connecting shaft 46, the connecting beam 42 is... Limited by the connecting shaft 46, the connecting shaft 46 and the connecting beam 42 are kept in a fixed and limited state, while the cylindrical section of the connecting shaft 46 and the suspension frame 44 are in a rotating connection state. At this time, the entire connecting beam 42 and the fall arrestor 41 can rotate relative to the suspension frame 44. At this time, the direction to be rotated is determined as needed, and the winding motor 51 on that side is made to work and wind the steel cable 52. Then, the traction force of the steel cable 52 is used to drive the fall arrestor 41 and the connecting beam 42 to rotate until the rotation angle is in place, and the entire rotation action can be realized. Since the carriage 3 is inside the fall arrestor 41, it is passively limited by the columns around the fall arrestor 41. Therefore, the rotation of the fall arrestor 41 will also drive the suspended carriage 3 to rotate. After the bottom of the painting carriage 3 is painted, the winding motor 51 works in the opposite direction until the steel cable 52 returns to its initial length. At this time, the steel cables 52 on both sides return to a balanced state. At this time, the self-propelled hoist 2 can move the painted carriage 3 out of the painting station. The self-propelled hoist vehicle 2, i.e., the bicycle equipped with an electric hoist, can move independently along the conveying track 1. The lifting device is selected directly from the type that does not interfere with the operation of the tilting mechanism 5. It is not a protected subject and is existing technology, so it is sufficient to implement it. The tilting mechanism 5 does not need to drive the carriage to tilt 90 degrees; it only needs to tilt to expose the bottom surface.

[0023] This invention expands the traditional single conveying function into a safe working platform. The fall arrestor 41 not only serves as the final physical barrier against the fall of the carriage 3, ensuring the safety of the workers below, but also acts as the execution carrier of the tilting mechanism 5. Through the unique cooperation between the connecting shaft 46 and the suspension frame 44, the fall arrestor 41 and the carriage 3 are integrated as a whole, achieving reliable tilting under the traction of the winding motor and the steel cable 52. This achieves two goals at once: it expands the operating space and reduces the difficulty of operation by exposing the bottom of the carriage 3, and it ensures that even in the tilting state, the carriage 3 is still under the protection of being lifted, thus improving both safety and work efficiency.

[0024] Example 2: like Figure 4 As shown, based on Embodiment 1, a new advancing / retreating component 7 is added. Specifically, the advancing / retreating component 7 enables the switching between a fixed connection and a movable connection between the suspension frame 44 and the connecting beam 42.

[0025] The forward and backward assembly 7 includes a rectangular head 71, which is fixed to the end of the connecting shaft 46. The rectangular head 71 extends out of the through groove 45 and cooperates with a limiting sleeve 72 fixed on the side of the suspension frame 44 corresponding to the position of the rectangular head 71. In the initial state, the limiting sleeve 72 is sleeved on the rectangular head 71 to limit the rectangular head 71. The limiting sleeve 72 is also provided with an embedding part 73 near the end of the connecting shaft 46. When the limiting sleeve 72 cooperates with the rectangular head 71, the embedding part 73 is embedded between the rectangular head 71 and the side of the suspension frame 44. An automatic telescopic rod 74 is also fixedly installed on the suspension bracket 44. A limiting sleeve 72 is fixed to the end of the automatic telescopic rod 74. A slot 75 is opened at the bottom of the limiting sleeve 72 for the rectangular head 71 to enter. The automatic telescopic rod 74 drives the lower limiting sleeve 72 to rise and fall, so as to realize the switching of the state of the connecting shaft 46.

[0026] In this invention, to ensure the fall arrestor 41 remains stable in its normal posture, a forward / backward assembly 7 is provided, which utilizes the lifting and lowering of the limiting sleeve 72 of the forward / backward assembly 7. Specifically, when stable transport is required, a hydraulic or pneumatic telescopic rod extends, pushing the bottom-fixed limiting sleeve 72. Since the bottom of the limiting sleeve 72 has a slot 75, this slot 75 perfectly matches the rectangular head 71. Therefore, the rectangular head 71 enters the limiting sleeve 72 along the slot 75. At this time, the limiting sleeve 72 and the rectangular head 71 are in a matched state. Since the automatic telescopic rod 74 is fixed on the suspension frame 44, the rectangular head 71... The rectangular head 71 and connecting shaft 46 are both restricted from rotating, which in turn restricts the rotation between the rectangular head 71, connecting shaft 46, connecting beam 42, and fall arrestor 41 and suspension frame 44, keeping the fall arrestor 41 and carriage 3 in a stable transport state. When carriage 3 needs to be tilted, the suspension frame 44 and connecting beam 42 need to be in a free state. Therefore, the automatic telescopic rod 74 retracts, causing the limit sleeve 72 to disengage from the rectangular head 71. At this time, the connecting shaft 46 and connecting beam 42 are synchronized, while the suspension frame 44 is in a free state, providing conditions for the subsequent tilting mechanism 5 to tilt.

[0027] This invention achieves precise control over the degree of freedom of rotation by driving the limit sleeve 72 and the rectangular head 71 of the connecting shaft 46 to engage and disengage through the automatic telescopic rod 74. When the limit sleeve 72 is locked, the entire anti-fall frame 41 is rigidly connected to the suspension frame, ensuring absolute stability during the conveying process and avoiding shaking. When rotation is required, the lock is released, and the device automatically enters the ready-to-rotate state. The forward and backward component 7 is a safety switch connecting the two core processes of conveying and rotation, and has the function of balancing transportation stability and rotation flexibility.

[0028] Example 3: like Figure 3 As shown, based on Example 2, a tensioning mechanism 8 is added; specifically: The system also includes multiple tensioning mechanisms 8, which cooperate with the automatic telescopic rod 74. When the automatic telescopic rod 74 retracts, it drives the tensioning mechanism 8 to tension the steel cable 52 before it is activated. When the automatic telescopic rod 74 extends, it drives the tensioning mechanism 8 to restore the slack of the steel cable 52.

[0029] Each tensioning mechanism 8 includes a pull rope 81 and a tensioning lever 82. One end of the pull rope 81 is fixed to the telescopic part of the automatic telescopic rod 74, and the other end passes over the guide wheel 89 and is fixed to the connecting rod 88. The middle part of the tensioning lever 82 is hinged to the reinforcing beam 6 through a fulcrum shaft 83 and a torsion spring, so that the tensioning lever 82 can swing around the fulcrum shaft 83. One end of the tensioning lever 82 is the driving end 84, and the other end is the actuating end 85. An arc-shaped groove 86 is provided on the driving end 84, and an arc-shaped groove 86 with the same structure is also fixed on the side of the suspension frame 44 through a bracket. The guide wheel 89 is rotatably connected to the bracket, and the connecting rod 88 is freely slidably inserted into the two arc-shaped grooves 86. A guide tensioning wheel 87 is rotatably mounted on the actuating end 85. When the automatic telescopic rod 74 retracts, causing the limiting sleeve 72 to disengage from the rectangular head 71 to allow the flipping, the end of the pull rope 81 moves with the telescopic part of the automatic telescopic rod 74, pulling the connecting rod 88 at the other end to slide in the two arc-shaped grooves 86, and finally pushing the drive end 84, causing the tension lever 82 to rotate around the fulcrum axis 83; the actuating end 85 of the tension lever 82 then swings outward, pushing the guide tension wheel 87 to swing outward a certain distance, thereby pressing the steel cable 52 to the side, eliminating the transmission gap before start-up and providing initial tension force for flipping; When the automatic telescopic rod 74 extends and drives the limit sleeve 72 to lock the rectangular head 71, the end of the pull rope 81 moves in the opposite direction. Under the action of the fulcrum shaft 83 and the torsion spring, the tension lever 82 rotates in the opposite direction, and the actuator end 85 of the tension lever 82 swings inward, releasing the tension on the steel cable 52 and restoring the steel cable 52 to a relaxed state.

[0030] In this invention, when the automatic telescopic rod 74 retracts to unlock the connecting shaft 46 and the fall arrestor 41, the drive end 84 of the tension lever 82 is pulled, causing the execution end 85 of the tension lever 82 to swing outward, thereby driving the guide tension wheel 87 to swing outward and press the steel cable 52 on that side, actively preparing for the rollover; thus, before the winding motor 51 starts, the transmission gap, i.e., the play, before the start of the steel cable 52 system is automatically eliminated; at the same time, it provides the steel cable 52 with an initial and stable tension force; when the winding motor 51 is started subsequently, the motor power can be transmitted to the fall arrestor 41 instantly and without impact, making the rollover start faster, the action smoother, and the control more precise, effectively avoiding the shaking of the carriage 3 at the moment of start-up, and achieving the purpose of improving responsiveness and stability; When the automatic telescopic rod 74 extends and locks the connecting shaft 46 and the fall arrestor 41, the drive end 84 of the tension lever 82 is relaxed. Under the action of the fulcrum shaft 83 and the torsion spring, the execution end 85 of the tension lever 82 swings inward, thereby driving the guide tension wheel 87 to swing inward to release tension. The slack steel cable 52 provides a guarantee for safe conveying. Therefore, in the non-overturning conveying state, the slack steel cable 52 will not generate any unexpected pulling force on the fall arrestor 41, eliminating the instability factors that may be caused by the steel cable 52 always being taut. At the same time, the slack steel cable 52 is easier to retract, reducing the risk of snagging or wear with surrounding equipment in the narrow conveying space and extending the service life of the steel cable 52.

[0031] It should be noted that the tensioning mechanism 8 does not maintain a constant tension force throughout the entire flipping process, but rather aims to eliminate the transmission gap from a standstill to the moment of initiation. That is, before the flipping starts, the steel cable is in a slack state with a period of idle travel. Without pre-tensioning, the winding motor 51 needs to first wind up this slack cable before suddenly generating an impact force on the fall arrestor 41, leading to an unstable start and vibration. By pressing down the guide tensioning wheel 87 instantaneously before initiation using the tensioning lever 82, the idle travel of the steel cable is pre-tensioned laterally. When the winding motor 51 starts rotating, the power can be instantly and without delay transmitted to the fall arrestor, thus achieving a smooth and precise start. Once the fall arrestor 41 begins to flip, the system's dynamic state is established. At this point, even if the guide tensioning wheel 87 can no longer maintain the initial pre-tension force, it has already ensured a smooth start. Subsequent flipping is maintained by the winding motor 51 continuously winding up the steel cable 52.

[0032] This invention deeply links the movement of the forward / reverse component 7 with the preparation work of the flipping mechanism 5, achieving the effect of tensioning upon unlocking and slackness upon locking. On one hand, the tensioning mechanism 8 converts the linear motion of the automatic telescopic rod 74 into tensioning and slackness of the steel cable 52 through the lever principle. When the automatic telescopic rod 74 retracts and unlocks, it tensions the working side steel cable 52 in conjunction, eliminating the transmission gap at startup and establishing the initial tension force. This makes the subsequent flipping startup smooth, rapid, impact-free, and vibration-free, greatly improving the accuracy and stability of the flipping. On the other hand, when the automatic telescopic rod 74 extends and locks, the steel cable 52 automatically relaxes, eliminating unnecessary pulling on the fall arrestor 41 during the conveying process, ensuring stability, and also allowing the steel cable 52 to retract, avoiding interference and wear with surrounding equipment. This seamlessly connects the preparation action with the main operation, improving rapid response and overall reliability.

[0033] Example 4: like Figure 5 As shown, based on embodiment 1, a new stabilizing component 9 is added. Specifically, a stabilizing component 9 is provided on the crossbeam at the bottom of the fall arrestor 41 to prevent the carriage 3 from sliding laterally when it is overturned. The stabilizing component 9 includes at least one set of arc-shaped grippers 91 symmetrically distributed on both sides of the carriage 3. The middle part of the arc-shaped grippers 91 is hinged to the crossbeam by a torsion spring. One end of the arc-shaped grippers 91 is located below the bottom of the carriage 3, and the other end is provided with a limiting strip 92.

[0034] In the initial state of this invention, the carriage 3 is in a vertically hoisted state, with the bottom of the carriage 3 directly pressing against the lower end of the arc-shaped gripper 91. The downward pressure generated by the weight of the carriage 3 overcomes the elastic force of the torsion spring, forcing the arc-shaped gripper 91 to rotate against the torsion spring force. This causes the limiting strip 92 at the other end of the gripper to swing inward and firmly abut against or lock onto the side of the carriage 3, thus forming an effective lateral mechanical stop to prevent the carriage 3 from sliding laterally due to gravity or external disturbances. When the carriage 3 moves upward, the bottom of the carriage 3 does not contact the pressure end of the arc-shaped gripper 91. At this time, under the action of the torsion spring, the arc-shaped gripper 91 is reset, maintaining a gap between the limiting strip 92 and the carriage 3. At this time, the stabilizing component 9 does not exert any lateral constraint on the carriage 3 and will not interfere with the normal lifting and transport of the carriage 3.

[0035] To mitigate the risk of lateral slippage in the carriage 3, this invention adds a passively triggered stabilizing component 9. When the carriage 3 is vertically positioned at the bottom of the fall arrestor 41, its own weight presses down on the arc-shaped gripper 92, causing the limiting strip 92 to automatically pop out and abut against the side of the carriage 3, forming an effective lateral limit. When the carriage 3 rises to a certain height, the bottom of the carriage 3 disengages from the arc-shaped gripper, and the torsion spring immediately drives the arc-shaped gripper 91 to rotate, causing the limiting strip 92 to retract without interference. The above process requires no sensors or controllers, relying entirely on the mechanical structure to respond to changes in the system's attitude, providing real-time and automatic stability assurance for the carriage 3, further enhancing the safety of the overall device under complex working conditions.

[0036] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A suspended conveyor system for a car body painting production line with a fall protection support device, characterized in that, It includes a conveying track and a self-propelled hoist cart that can run on the conveying track. The bottom of the self-propelled hoist cart is suspended and the carriage is conveyed by a lifting device. The bottom of the self-propelled hoist cart is equipped with a fall protection mechanism. The fall protection mechanism includes a fall protection frame, which is located under the self-propelled hoist cart. The fall arrestor is equipped with a tilting mechanism, which is used to tilt the suspended carriage so that the bottom of the carriage is exposed to the side for painting; the fall arrestor also includes: Two symmetrically arranged inverted V-shaped connecting beams are fixedly mounted on the top of the fall arrestor. A through slot is provided at the middle of the top of the connecting beam. A suspension frame is provided on the top of the connecting beam. A through slot coaxial with the through slot is provided at the bottom of the suspension frame. The bottom of the suspension frame and the top of the connecting beam are connected by a connecting shaft. The connecting shaft includes a rectangular section and a cylindrical section. The rectangular section matches the through slot of the connecting beam, and the cylindrical section matches the through slot of the suspension frame. A limiting head is provided at one end of the connecting shaft. The top of the suspension frame is fixed to the self-propelled hoist, and the four corners of the bottom of the fall arrestor are equipped with wheels. The suspension frame and the connecting beam are connected by a retractable assembly, which allows for switching between a fixed connection and a movable connection. The forward and backward assembly includes a rectangular head, which is fixed to the end of the connecting shaft. The rectangular head extends out of the through groove and engages with a limiting sleeve fixed on the side of the suspension frame at the position corresponding to the rectangular head. In the initial state, the limiting sleeve is fitted onto the rectangular head to limit its movement. The limiting sleeve is also provided with an insert at the position near the end of the connecting shaft. When the limiting sleeve engages with the rectangular head, the insert is precisely embedded between the rectangular head and the side of the suspension frame. An automatic telescopic rod is also fixedly installed on the suspension frame. A limiting sleeve is fixed to the end of the automatic telescopic rod. A slot is opened at the bottom of the limiting sleeve for the rectangular head to enter. The automatic telescopic rod drives the lower limiting sleeve to rise and fall, so as to switch the state of the connecting shaft.

2. The suspended conveyor system for a car body painting production line with anti-fall support device according to claim 1, characterized in that, The flipping mechanism includes symmetrically distributed winding motors on both sides. The winding shaft of the winding motor is fixedly connected to one end of the steel cable on the corresponding side, and the other end of the steel cable is fixed to the bottom of the fall arrestor on the corresponding side. A reinforcing beam is fixed between the two suspension frames, and the winding motor is fixedly installed on the reinforcing beam. The steel cable is wound by a single-sided winding motor, which pulls the fall arrestor and the car body to tilt upwards on that side, thus changing the posture of the entire car body and fall arrestor from the original vertical posture to the tilted posture. After the bottom of the car body is painted, it returns to the original posture.

3. The suspended conveyor system for a car body painting production line with an anti-fall support device according to claim 1, characterized in that, The system also includes multiple tensioning mechanisms that cooperate with the automatic telescopic rod. When the automatic telescopic rod retracts, it drives the tensioning mechanism to tension the steel cable before it is activated. When the automatic telescopic rod extends, it drives the tensioning mechanism to restore the slack of the steel cable.

4. The suspended conveyor system for a car body painting production line with an anti-fall support device according to claim 3, characterized in that, Each tensioning mechanism includes a pull rope and a tension lever. One end of the pull rope is fixed to the telescopic part of the automatic telescopic rod, and the other end is fixed to the connecting rod after passing over the guide wheel. The middle part of the tension lever is hinged to the reinforcing beam through a fulcrum shaft and a torsion spring, allowing the tension lever to swing around the fulcrum shaft. One end of the tension lever is the driving end, and the other end is the actuating end. An arc-shaped groove is provided on the driving end, and an arc-shaped groove with the same structure is also fixed to the side of the suspension frame through a bracket. The guide wheel is rotatably connected to the bracket, and the connecting rod is freely slidably inserted into the two arc-shaped grooves. A guide tension wheel is rotatably mounted on the actuating end. When the automatic telescopic rod retracts, causing the limit sleeve to disengage from the rectangular head to allow for flipping, the end of the pull rope moves with the telescopic part of the automatic telescopic rod, pulling the connecting rod at the other end to slide within the two arc-shaped grooves, ultimately pushing the drive end to rotate the tension lever around the fulcrum axis; the actuator end of the tension lever then swings outward, pushing the guide tension wheel to swing outward a certain distance, thereby pressing the steel cable to the side, eliminating the transmission backlash before start-up and providing initial tension force for flipping; When the automatic telescopic rod extends and locks the rectangular head with the limit sleeve, the end of the pull rope moves in the opposite direction. Under the action of the fulcrum shaft and the torsion spring, the tension lever rotates in the opposite direction, and the actuator end of the tension lever swings inward, releasing the tension on the steel cable and restoring the steel cable to a slack state.

5. The suspended conveyor system for a car body painting production line with an anti-fall support device according to claim 1, characterized in that, The bottom crossbeam of the fall arrestor is equipped with stabilizing components to prevent the carriage from sliding laterally when it overturns; The stabilizing component includes at least one set of arc-shaped grippers symmetrically distributed on both sides of the car body. The middle part of the arc-shaped grippers is hinged to the crossbeam by a torsion spring. One end of the arc-shaped gripper is located below the bottom of the car body, and the other end is provided with a limiting strip.

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