Variable constraint type safety protection device for self-propelled hoist

Abstract

The invention provides a variable constraint type safety protection device for a self-propelled hoist, and belongs to the technical field of hoisting protection, the variable constraint type safety protection device comprises a cross beam, the upper end faces of the two sides of the cross beam are respectively provided with a driving mechanism and a load-bearing chain, and the load-bearing chain is provided with a plurality of load-bearing rings which are sequentially sleeved from top to bottom; the bearing ring is provided with two arc-shaped sections and two longitudinal sections, the two longitudinal sections are each provided with a movable clamping jaw, one end of the inner side of each movable clamping jaw is provided with a hinge part rotationally installed on the corresponding longitudinal section, and one end of the outer side of each movable clamping jaw is connected with a clutch pull wire; the two clutch pull wires are sequentially and spirally connected with the movable clamping jaws on one sides of the multiple bearing rings and the movable clamping jaws on the other sides of the multiple bearing rings from bottom to top, and the two clutch pull wires on the same bearing chain are connected with the driving mechanisms on the same side. The action of inertia force can be effectively counteracted, personnel injury caused by irregular swing in the moving process is avoided, the assembly precision is improved, and the operation difficulty is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of hoisting protection, more particularly to a variable constraint type safety protection device for a self-moving hoist. BACKGROUND

[0002] A self-moving hoist is a common hoisting device, widely used in overhead traveling cranes, gantry cranes and other equipment. Electric hoists are often used in factories, warehouses and wharfs and other places to assist workers in lifting heavy objects due to their small size, easy operation and convenient use. However, two workers are usually needed to cooperate when loading and unloading the self-moving hoist. One worker is responsible for operating the movement of the self-moving hoist, and the other worker stands on the truck to hang the hook below the self-moving hoist on the cargo to complete the lifting task.

[0003] At present, the traditional self-moving hoist has almost no effective constraint on the bearing chain, resulting in low rigidity of the entire system and insufficient deformation resistance. During operation, when the bearing chain moves between the ground and the truck with the self-moving hoist, the bearing chain will swing randomly due to the inability to overcome the inertial force in time. This swinging not only increases the difficulty of operation, but also may pose a threat to the safety of workers, especially when holding the bearing chain with hands, the bearing chain below the hands and the upper beam may cause impact injury to the head and lower body of the operator. SUMMARY

[0004] The purpose of the present application is to provide a variable constraint type safety protection device for a self-moving hoist, which effectively solves the safety hazards caused by the swinging of the bearing chain due to inertial force during loading and unloading, and protects the safety of the operator.

[0005] To achieve the above purpose, the technical solution adopted by the present application is to provide a variable constraint type safety protection device for a self-moving hoist, comprising a cross beam, a driving mechanism is arranged on the upper end face of both sides of the cross beam, a bearing chain is arranged on the lower end of both sides of the cross beam, and the bearing chain has a plurality of bearing rings arranged in sequence from top to bottom. The bearing ring has two arc segments distributed vertically and two longitudinal segments distributed horizontally, a movable dog is arranged on each of the two longitudinal segments, the two movable dogs on the same bearing ring are centrally symmetric, a hinge portion is arranged on the longitudinal segment at the inner side of one end of the movable dog, and a clutching pull wire is connected to the outer side of the other end of the movable dog, the two clutching pull wires are sequentially and spirally connected to the movable dogs on one side of the bearing ring and the movable dogs on the other side of the bearing ring from bottom to top, and the two clutching pull wires on the same bearing chain are connected to the driving mechanisms on the same side. The drive mechanism drives the two clutch cables on the same load-bearing chain to pull upwards, so as to cause the movable claws on both sides of the same load-bearing ring to engage with the two longitudinal sections of the upper load-bearing ring in the same direction.

[0006] In one possible implementation, connecting blocks are respectively provided on the lower end faces of both sides of the crossbeam, the top load-bearing ring is sleeved on the connecting block on the same side, and the movable claws on both sides of the top load-bearing ring are connected to the two sides of the connecting block through the clutch pull line.

[0007] In one possible implementation, a groove is provided at the bottom of the crossbeam along its length, and the connecting block is slidably disposed within the groove.

[0008] In one possible implementation, the connecting block has a built-in magnetic coil. When the magnetic coil is energized, it magnetizes the connecting block so that the two movable claws are magnetically attracted to the two sides of the connecting block.

[0009] In one possible implementation, the drive mechanism includes a drive motor and a winding roller. The drive end of the drive motor is provided with a drive gear, and one end of the winding roller is provided with a driven gear. The drive gear and the driven gear mesh. The two clutch cables on the same side are wound on the winding roller on the same side. The drive motor drives the winding roller to rotate through the drive gear and the driven gear, so as to simultaneously pull the two clutch cables on the same side upward.

[0010] In one possible implementation, the hinge includes a mounting sleeve and an L-shaped rotating rod. The mounting sleeve is vertically fixed to the middle of the longitudinal section. The first end of the L-shaped rotating rod is rotatably mounted inside the mounting sleeve. The second end of the L-shaped rotating rod is bent at 90° and extends toward the middle of the corresponding load-bearing ring. One inner end of the movable claw is connected to the second end of the L-shaped rotating rod.

[0011] In one possible implementation, the movable pawl includes a connecting rod and a locking pawl. One end of the connecting rod is fixedly connected to the second end of the L-shaped rotating rod, and the locking pawl is connected to the other end of the connecting rod. The connecting rod and the locking pawl are set at an obtuse angle. A connecting part for connecting the clutch cable is provided on the outer side of the connection area between the connecting rod and the locking pawl. The clutch cable is pulled upward to drive the locking pawl to rotate upward about the axial direction of the mounting sleeve, and to make the inner side of the locking pawl overlap a longitudinal section of the upper load-bearing ring.

[0012] In one possible implementation, the connecting part includes a fixing lug and a locking bolt. The fixing lug is integrally formed on the outside of the connection area of ​​the connecting rod and the locking claw. The locking bolt passes vertically through the fixing lug on the side away from the connection area of ​​the connecting rod and the locking claw, and is used to clamp the clutch cable on the fixing lug.

[0013] In one possible implementation, the inner surface of the locking claw is provided with anti-slip stripes.

[0014] The beneficial effects of the variable constraint safety protection device for self-propelled hoists provided by this invention are as follows: Compared with the prior art, by pulling the clutch cable through the drive mechanism, the movable claws on both sides of the same load-bearing ring can be driven to rotate in the same direction and overlap on the longitudinal section of the upper load-bearing ring. After the movable claws overlap with the upper load-bearing ring, multiple load-bearing rings form a rigidly connected integral structure through the movable claws. The swing amplitude of the load-bearing chain after rigid constraint is greatly reduced, reducing the probability of accidental collision between the chain and the operator's body. Since the chain swing is suppressed, the operator does not need to use his hands to support and stabilize the chain, avoiding the dangerous state of the hands being between the chain and the crossbeam. From the operation process, the hidden dangers of being pinched or impacted when supporting are eliminated, significantly improving the overall rigidity and deformation resistance of the load-bearing chain. This rigid constraint can effectively counteract the effect of inertial force, preventing personnel injury caused by irregular swinging during movement, while reducing the difficulty of operation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the variable constraint type safety protection device for self-propelled hoists provided by the present invention. Figure 2 for Figure 1 A magnified view of a section at point A in the middle; Figure 3 for Figure 1 A magnified view of a section at point B in the middle; Figure 4 for Figure 1 A magnified view of a section at point C; Figure 5 for Figure 1 A magnified view of a section at point M; Figure 6 for Figure 1 A magnified view of a portion of point N in the middle; Figure 7 This is a schematic diagram of the structure of the lower end face of the crossbeam provided by the present invention; Figure 8 for Figure 7 A sectional view along the middle DD.

[0017] In the picture: 100. Crossbeam; 110. Connecting block; 120. Slide groove; 130. End block; 140. Locking and positioning bolt; 200. Drive mechanism; 210. Drive motor; 220. Winding roller; 230. Drive gear; 240. Driven gear; 300. Load-bearing chain; 310. Load-bearing ring; 311. Arc-shaped section; 312. Longitudinal section; 400. Movable pawl; 410. Connecting rod; 420. Locking pawl; 421. Anti-slip stripe; 430. Connecting part; 431. Fixed lug; 432. Locking bolt; 440. Hinge part; 441. Mounting sleeve; 442. L-shaped rotating rod; 500. Clutch cable. Detailed Implementation

[0018] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0019] Unless otherwise explicitly specified, the use of terms such as "first," "second," or "third" is intended to distinguish different objects, not to describe a specific order.

[0020] Unless otherwise expressly defined, the use of directional terms such as “center,” “lateral,” “longitudinal,” “horizontal,” “vertical,” “top,” “bottom,” “inner,” “outer,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “clockwise,” “counterclockwise,” “high,” and “low” to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing the invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific scope of protection of the invention.

[0021] Please see Figures 1 to 4The present invention will now describe a variable constraint safety protection device for a self-propelled hoist. A variable constraint safety protection device for a self-propelled hoist includes a crossbeam 100. Drive mechanisms 200 are respectively provided on the upper surfaces of both sides of the crossbeam 100, and load-bearing chains 300 are respectively provided on the lower surfaces of both sides of the crossbeam 100. Each load-bearing chain 300 has multiple load-bearing rings 310 sequentially arranged from top to bottom. Each load-bearing ring 310 has two vertically distributed arc-shaped segments 311 and two horizontally distributed longitudinal segments 312. Movable claws 400 are provided on each of the two longitudinal segments 312. The two movable claws 400 on the same load-bearing ring 310 are centrally symmetrical. One end of each movable claw 400 is rotatably mounted on the longitudinal segment 311. The hinge part 440 on the 2 has a clutch cable 500 connected to one end of the outer side of the movable claw 400. The two clutch cables 500 are spirally connected from bottom to top to the movable claws 400 on one side of the multiple load-bearing rings 310 and the movable claws 400 on the other side of the multiple load-bearing rings 310. The two clutch cables 500 on the same load-bearing chain 300 are connected to the drive mechanism 200 on the same side. The drive mechanism 200 drives the two clutch cables 500 on the same load-bearing chain 300 to pull upward, so as to drive the movable claws 400 on both sides of the same load-bearing ring 310 to overlap on the two longitudinal sections 312 of the upper load-bearing ring 310 in the same direction.

[0022] This invention provides a variable constraint safety protection device for self-propelled hoists. Compared with existing technologies, by pulling the clutch cable 500 through the drive mechanism 200, the movable claws 400 on both sides of the same load-bearing ring 310 can rotate in the same direction and overlap onto the longitudinal section 312 of the upper load-bearing ring 310. After the movable claws 400 overlap with the upper load-bearing ring 310, multiple load-bearing rings 310 form a rigidly connected integral structure through the movable claws 400. The swing amplitude of the load-bearing chain 300 after rigid constraint is greatly reduced, reducing the probability of accidental impact between the chain and the operator's body. Since the chain swing is suppressed, the operator does not need to use their hands to support and stabilize the chain, avoiding the dangerous state of the hands being between the chain and the crossbeam 100. From the operation process, the hidden danger of being pinched or impacted when supporting is eliminated, significantly improving the overall rigidity and deformation resistance of the load-bearing chain 300. This rigid constraint can effectively counteract the effect of inertial force, preventing personnel injury caused by irregular swinging during movement, while reducing the difficulty of operation.

[0023] Please see Figure 3Connecting blocks 110 are respectively provided on the lower end faces of both sides of the crossbeam 100. The top load-bearing ring 310 is sleeved on the connecting block 110 on the same side. The movable claws 400 on both sides of the top load-bearing ring 310 are connected to the two sides of the connecting block 110 through the clutch cable 500. When the drive mechanism 200 pulls the movable claws 400 on both sides of the top load-bearing ring 310 through the clutch cable 500, the movable claws 400 on both sides will rotate in the same direction and connect to the two sides of the connecting block 110. Since the two movable claws 400 on the same load-bearing ring 310 are centrally symmetrical, this symmetrical connection method can make the forces on both sides of the connecting block 110 equal in magnitude and opposite in direction, forming a balanced constraint. This balanced constraint keeps the top load-bearing ring 310 stable on the connecting block 110, preventing it from shifting or tilting due to unilateral force. This lays the foundation for the balance of the entire load-bearing chain 300, ensuring that the top load-bearing ring 310 can stably bear the force above and transmit it to the load-bearing ring 310 below during load-bearing and movement.

[0024] As the starting point of the load-bearing chain 300, the top-level load-bearing ring 310 transmits its stable balance to all the lower load-bearing rings 310, reducing the chain-like swaying caused by top-level imbalance. This makes the chain more stable during movement and load-bearing, reducing the operational difficulty caused by chain swaying from the source. Secondly, the top-level load-bearing ring 310, through its stable connection with the connecting block 110 and the symmetrical overlap of the movable claw 400, can more effectively resist the influence of inertial forces, reducing the risk of impact injury to operators when the chain sways.

[0025] Please see Figure 7 and Figure 8 The bottom of the crossbeam 100 has a groove 120 along its length. The connecting block 110 is slidably disposed in the groove 120. The groove 120 is a T-shaped groove, and the connecting block 110 is a T-shaped block adapted to the groove 120. End blocks 130 are inserted into both ends of the crossbeam 100. The connecting block 110 can be disassembled and assembled in the groove 120 by disassembling and assembling the end blocks 130. In addition, a plurality of locking and positioning bolts 140 are arranged at intervals along the length of the crossbeam 100. The locking and positioning bolts 140 are longitudinally threaded onto the crossbeam 100, and their lower ends pass into the groove 120.

[0026] The connecting block 110 slides into the T-shaped groove 120 at the bottom of the crossbeam 100 via a matching T-shaped structure, allowing its position to be freely adjusted along the length of the crossbeam 100. This enables flexible changes in the connection point based on the spacing requirements of connecting other components during actual installation, eliminating the need for re-drilling holes or additional processing on the crossbeam 100, thus improving the structure's adaptability and scenario versatility. Secondly, the end blocks 130 at both ends of the crossbeam 100 adopt a plug-in design, allowing for easy assembly and disassembly of the connecting block 110 within the groove 120. This avoids damage to the crossbeam 100 or the groove 120 structure. Compared to traditional welding or integral molding methods, this not only simplifies the operation process but also significantly reduces maintenance and time costs associated with replacing or adding / removing the connecting block 110. Finally, multiple locking and positioning bolts 140, spaced apart along the length of the crossbeam 100, are longitudinally threaded to the crossbeam 100 and their lower ends pass through the sliding groove 120. Once the connecting block 110 is adjusted to the target position, tightening the bolts securely fastens the connecting block 110, effectively preventing slippage under stress or vibration, thus ensuring the reliability of the connecting part 430 and the stability of the overall structure. Preferably, the connecting block 110 has a built-in magnetic coil. When the magnetic coil is energized, it magnetizes the connecting block 110, magnetically attracting the two movable claws 400 to both sides of the connecting block 110. When the magnetic coil is energized, the connecting block 110 is magnetized, generating a magnetic attraction that firmly holds the two movable claws 400 overlapping its two sides. This magnetic attraction, combined with the overlapping structure of the movable claw 400, creates a dual fixing effect. This effectively prevents the movable claw 400 from loosening or detaching due to vibration, external impact, or other factors, ensuring that the top-level load-bearing ring 310 remains stably connected to the connecting block 110, maintaining balance. Compared to relying solely on the mechanical overlapping of the movable claw 400, the magnetic attraction makes the connection between the movable claw 400 and the connecting block 110 much tighter and more secure.

[0027] Please see Figure 2 The drive mechanism 200 includes a drive motor 210 and a winding roller 220. The drive end of the drive motor 210 is provided with a drive gear 230, and one end of the winding roller 220 is provided with a driven gear 240. The drive gear 230 and the driven gear 240 mesh. Two clutch cables 500 on the same side are wound on the winding roller 220 on the same side. The drive motor 210 drives the winding roller 220 to rotate through the drive gear 230 and the driven gear 240, so as to simultaneously pull the two clutch cables 500 on the same side upward.

[0028] When the self-propelled hoist needs to move between the ground and the truck, or when it is in a working phase that requires suppressing the sway of the load-bearing chain 300, the drive mechanism 200 starts working, and the drive motor 210 is energized and runs. Its drive end drives the drive gear 230 to rotate synchronously. Since the drive gear 230 meshes with the driven gear 240 at one end of the winding roller 220, the rotation of the drive gear 230 is transmitted to the driven gear 240, thereby driving the winding roller 220 to start rotating. As the winding roller 220 rotates, the two clutch cables 500 on the same side are synchronously wound on the winding roller 220, realizing the simultaneous upward lifting of the two clutch cables 500. This lifting action is transmitted to each load-bearing ring 310 of the load-bearing chain 300, causing the movable claws 400 on both sides of the same load-bearing ring 310 to rotate in the same direction. For the top-layer load-bearing ring 310, the movable claws 400 on both sides overlap with the two sides of the connecting block 110 under the lifting action; for the lower-layer load-bearing ring 310, the movable claws 400 on both sides overlap with the two longitudinal sections 312 of the upper-layer load-bearing ring 310, ultimately forming a rigid connection structure for the entire load-bearing chain 300, thus constraining the chain's swing. When it is necessary to release the constraint and restore the load-bearing chain 300 to its flexible state for hoisting operations, the drive motor 210 rotates in reverse, driving the winding roller 220 to rotate in reverse through the meshing of the drive gear 230 and the driven gear 240, releasing the clutch cable 500 wound on it. The movable claws 400 disengage from the overlapping part under their own weight or the action of the reset device, and the chain returns to its free state.

[0029] The drive motor 210 drives the winding roller 220 to rotate via gear meshing. Gear transmission features precise transmission ratio and high efficiency, ensuring stable rotation angle and speed of the winding roller 220, thereby achieving precise control over the lifting length and force of the clutch cable 500. This allows for precise adjustment of the overlap position and constraint strength of the movable claw 400, ensuring the stability of the constraint state of the load-bearing chain 300 and effectively preventing component damage caused by uneven lifting force or excessive lifting. The two clutch cables 500 on the same side are wound on the same winding roller 220. When the winding roller 220 rotates, it simultaneously applies tension to both clutch cables 500, ensuring completely synchronized lifting actions of the two clutch cables 500 on the same side. This synchronicity ensures that the movable claws 400 on both sides of the same load-bearing ring 310 can rotate and overlap at the same speed and force, avoiding the tilting or imbalance of the load-bearing ring 310 caused by uneven tension on one side of the pull line, further enhancing the balance and stability of the top load-bearing ring 310 and the entire chain, and reducing the extra swaying of the chain caused by uneven tension.

[0030] Please see Figure 4The hinge part 440 includes a mounting sleeve 441 and an L-shaped rotating rod 442. The mounting sleeve 441 is vertically fixed to the middle of the longitudinal section 312. The first end of the L-shaped rotating rod 442 is rotatably mounted in the mounting sleeve 441. The second end of the L-shaped rotating rod 442 is bent at 90° and extends to the middle of the corresponding load-bearing ring 310. One end of the movable claw 400 is connected to the second end of the L-shaped rotating rod 442. When the drive mechanism 200 pulls the outer end of the movable claw 400 upward through the clutch cable 500, the movable claw 400 will drive the connected L-shaped rotating rod 442 to move. Since the first end of the L-shaped rotating rod 442 is rotatably installed in the mounting sleeve 441 which is vertically fixed in the middle of the longitudinal section 312, the L-shaped rotating rod 442 will rotate with the mounting sleeve 441 as the fulcrum. As the rotation proceeds, the second end of the L-shaped rotating rod 442, which bends at 90° and extends to the middle of the load-bearing ring 310, will drive the inner end of the movable claw 400 to rotate synchronously, so that the movable claw 400 as a whole swings towards the upper load-bearing ring 310 (or the connecting block 110 corresponding to the top load-bearing ring 310), and finally realizes the overlap of the movable claw 400 with the longitudinal section 312 of the upper load-bearing ring 310 (or the side of the connecting block 110). When the clutch cable 500 is released, under the action of the gravity of the movable claw 400 itself or the related reset force, the L-shaped rotating rod 442 will rotate in the opposite direction, causing the movable claw 400 to disengage from the overlapping part and return to the initial position.

[0031] The hinge 440 employs a structure of mounting sleeve 441 and L-shaped rotating rod 442, ensuring the stability and precision of the rotation of the movable jaw 400. The mounting sleeve 441 is vertically fixed to the middle of the longitudinal section 312, providing a firm and fixed rotation fulcrum for the L-shaped rotating rod 442, ensuring that the L-shaped rotating rod 442 will not deviate or wobble when rotated under force. The bending structure of the L-shaped rotating rod 442 matches the force direction of the movable jaw 400 with the rotation trajectory, enabling the movable jaw 400 to rotate precisely along a preset path, ensuring the accuracy of the overlap with the upper load-bearing ring 310 (or connecting block 110), and avoiding constraint failure due to rotational deviation.

[0032] Please see Figure 4The movable pawl 400 includes a connecting rod 410 and a locking pawl 420. One end of the connecting rod 410 is fixedly connected to the second end of the L-shaped rotating rod 442, and the locking pawl 420 is connected to the other end of the connecting rod 410. The connecting rod 410 and the locking pawl 420 are set at an obtuse angle. A connecting part 430 for connecting a clutch cable 500 is provided on the outer side of the connection area between the connecting rod 410 and the locking pawl 420. When the clutch cable 500 is pulled upward, it drives the locking pawl 420 to rotate axially upward with the mounting sleeve 441, and causes the inner side of the locking pawl 420 to overlap a longitudinal section 312 of the upper load-bearing ring 310. When the clutch cable 500 is pulled upward, the tension acts on the connecting part 430 on the outer side of the connection area between the connecting rod 410 and the locking pawl 420. Since one end of the connecting rod 410 is fixedly connected to the second end of the L-shaped rotating rod 442, and the first end of the L-shaped rotating rod 442 is rotatably installed inside the mounting sleeve 441, the tension will cause the entire movable pawl 400 to rotate upward about the axis of the mounting sleeve 441. During the rotation, the locking pawl 420, which is set at an obtuse angle to the connecting rod 410, will swing upward accordingly. As the rotation angle increases, the locking pawl 420 gradually approaches the longitudinal section 312 of the upper load-bearing ring 310, eventually causing the inner side of the locking pawl 420 to overlap on a longitudinal section 312 of the upper load-bearing ring 310, thus completing the constraint action on the upper load-bearing ring 310. When the clutch cable 500 is released, the movable pawl 400 rotates in the opposite direction under its own weight and other forces, and the locking pawl 420 disengages from the longitudinal section 312 of the upper load-bearing ring 310, releasing the constraint.

[0033] The structural design of the movable claw 400 enhances the tightness and stability of the constraint. The obtuse angle between the connecting rod 410 and the locking claw 420 allows the inner surface of the locking claw 420 to better wrap and fit against the longitudinal section 312 of the upper load-bearing ring 310 when it rotates upwards, increasing the contact area and thus improving the stability of the constraint. This effectively prevents the locking claw 420 from slipping during the load-bearing chain 300's stress or movement, further suppressing chain sway. Furthermore, the clutch cable 500 is connected to the outside of the connection area between the connecting rod 410 and the locking claw 420. When pulled upwards, the pulling force is transmitted more directly and efficiently to the entire movable claw 400, driving the locking claw 420 to rotate smoothly. Simultaneously, the obtuse angle structure makes the force transmission between the connecting rod 410 and the locking claw 420 more rational, reducing local stress concentration, lowering the risk of component damage due to excessive force, and extending the service life of the movable claw 400.

[0034] Please see Figure 4The connecting part 430 includes a fixing lug 431 and a locking bolt 432. The fixing lug 431 is integrally formed on the outside of the connection area between the connecting rod 410 and the locking claw 420. The locking bolt 432 penetrates vertically through the side of the fixing lug 431 away from the connection area between the connecting rod 410 and the locking claw 420, and is used to clamp the clutch cable 500 onto the fixing lug 431. The connecting part 430 achieves the connection between the clutch cable 500 and the movable claw 400 through the cooperation of the fixing lug 431 and the locking bolt 432. The fixing lug 431, integrally formed on the outside of the connection area between the connecting rod 410 and the locking claw 420, provides a reliable carrier for fixing the clutch cable 500. When the clutch cable 500 needs to be connected, place the clutch cable 500 on the fixed lug 431, and then insert the locking bolt 432 vertically through the side of the fixed lug 431 away from the connection area of ​​the connecting rod 410 and the locking claw 420. By tightening the locking bolt 432, the clutch cable 500 can be firmly clamped on the fixed lug 431, thereby achieving a tight connection between the clutch cable 500 and the movable claw 400, ensuring that the clutch cable 500 can stably drive the movable claw 400 during the lifting process. The fixed lug 431, the connecting rod 410, and the locking claw 420 are integrally formed, with high structural strength and not easily broken or deformed due to force. The locking bolt 432 vertically penetrates the fixing lug 431 and clamps the clutch cable 500, which can generate a large clamping force. This effectively prevents the clutch cable 500 from loosening or slipping during the lifting process, ensuring that the pulling force can be stably transmitted to the movable claw 400, guaranteeing the reliability of the movable claw 400's operation, and thus ensuring the stability of the constraint effect of the load-bearing chain 300.

[0035] Since the two clutch cables 500 on the same side are fixed to the connecting part 430 of the movable jaw 400 by corresponding locking bolts 432 and wound on the same winding roller 220, when the drive mechanism 200 drives the winding roller 220 to rotate, the two locking bolts 432 will simultaneously receive tension from the clutch cables 500. The clutch cables 500 between the two locking bolts 432 are of the same length, meaning that during the lifting process, the tension transmitted to the two movable jaws 400 over the same distance, and the magnitude of the tension remains balanced. This balanced tension transmission will cause the two movable jaws 400 to rotate around their respective mounting sleeves 441 at the same speed, thereby ensuring that the rotation angle of each movable jaw 400 is exactly the same. For the same load-bearing ring 310, the movable claws 400 on both sides rotate at the same angle, ensuring that they simultaneously and synchronously engage with the longitudinal section 312 of the upper load-bearing ring 310 (or the side of the connecting block 110 corresponding to the top load-bearing ring 310). This prevents a situation where one movable claw 400 is engaged while the other is not. The movable claws 400 on both sides of the same load-bearing ring 310 engage at the same angle, ensuring that the constraint forces on both sides of the upper load-bearing ring 310 (or connecting block 110) are completely balanced. This avoids tilting or shifting of the load-bearing ring 310 due to excessively tight or loose constraints on one side, thereby ensuring that the entire load-bearing chain 300 remains straight and stable under constraint and minimizing swaying.

[0036] Please see Figure 4 The inner surface of the locking claw 420 is provided with anti-slip stripes 421. The anti-slip stripes 421 can significantly enhance the friction between the locking claw 420 and the longitudinal section 312 of the upper load-bearing ring 310. When the inner surface of the locking claw 420 overlaps the longitudinal section 312, the anti-slip stripes 421 can increase the roughness of the contact surface, effectively preventing relative slippage between the two due to load or vibration, ensuring that the locking claw 420 constrains the upper load-bearing ring 310 more firmly, and avoiding the risk of the load-bearing chain 300 shaking or falling off due to constraint failure.

[0037] It is worth noting that when the device is running and all the moving claws 400 are engaged, the combination Figure 5A detailed force and constraint analysis can be performed using the single load-bearing ring 310 in the middle as a load-bearing ring 310 unit. When the two movable claws 400 of the load-bearing ring 310 unit are respectively attached to the two sides of the upper load-bearing ring 310, based on the interaction of forces, the upper load-bearing ring 310 will exert a reaction force on the two movable claws 400, so that the upper part of the load-bearing ring 310 unit bears horizontal reaction forces F1 and F2. Since F1 and F2 are not collinear, they form a torque in the horizontal plane, which tends to drive the load-bearing ring 310 unit to rotate around an axis perpendicular to the horizontal plane. At the same time, the two movable claws 400 of the lower load-bearing ring 310 will also exert a force on the load-bearing ring 310 unit, so that the upper part bears horizontal forces f1 and f2, thereby forming a torque in the a direction. The directions of the A direction torque and the a direction torque are exactly opposite, and the two cancel each other out, so that the load-bearing ring 310 unit as a whole maintains a stable posture and avoids overturning or misalignment due to excessive unidirectional torque.

[0038] From the perspective of degree-of-freedom constraints, the two movable claws 400 corresponding to the load-bearing ring 310 unit itself can restrict its Y-axis translation and Z-axis rotation; the two movable claws 400 corresponding to the lower load-bearing ring 310 unit can restrict the X-axis translation and Y-axis rotation of the load-bearing ring 310 unit. Through this layered and coordinated constraint, the rotational degrees of freedom of the load-bearing ring 310 unit along the X, Y, and Z axes, as well as the translational degrees of freedom along the X and Y axes, are significantly compressed, leaving only the Z-axis translational degree of freedom unconstrained. However, in actual operation, the load-bearing chain 300 is subject to the gravitational field, and its movement tendency is to proceed in an orderly manner in the opposite direction of gravity (such as synchronous ascent during lifting and suspension stability when stationary), and it will not translate arbitrarily in the Z-axis direction. Gravity becomes a natural constraint on the Z-axis translation.

[0039] In this way, the rotational and most translational degrees of freedom of the load-bearing ring 310 unit in three-dimensional space are effectively constrained along the X, Y, and Z axes. Implicit control of the Z-axis translation is achieved through gravity, ultimately resulting in precise spatial positioning. This positioning ensures that the load-bearing ring 310 unit maintains an orderly arrangement during lifting, hovering, and lowering operations, providing stable mechanical support for cargo hoisting and conveying. Through torque cancellation and multi-degree-of-freedom layered constraints, the long-term stability of the load-bearing ring 310 unit is guaranteed, preventing chain swaying, jamming, or even breakage, while reducing manufacturing costs and maintenance difficulty.

[0040] Combination Figure 6 The top load-bearing ring 310 can be used as a load-bearing ring 310 unit for detailed force and constraint analysis. Based on the set spatial coordinate system, the Z-axis is vertically upward, and the X-axis and Y-axis are horizontal and perpendicular to each other. The freedom constraints of each dimension of the load-bearing ring 310 unit are precise and coordinated.

[0041] For Z-axis rotation, it is directly restricted by two movable jaws 400. The movable jaws 400, through overlapping with the side of the connecting block 110, utilize the structural adaptability and symmetrically distributed contact force to generate a reverse torque to resist rotation, ensuring that the load-bearing ring 310 unit is stable in the vertical axis.

[0042] For X-axis rotation, the friction and magnetic attraction formed by the movable jaw 400 and the surface of the connecting block 110 together restrict the rotation. The friction generated by the normal pressure of the contact surface, combined with the magnetic attraction to enhance the constraint, works together to cope with the rotation trend and build a dynamically stable constraint effect.

[0043] For Y-axis rotation, it is also constrained by two movable jaws 400. With the help of the symmetrical layout of the movable jaws 400 in space, a bidirectional counterbalancing torque is formed to counteract the rotational tendency and optimize the force distribution.

[0044] For X-axis translation, the X-axis position is fixed by the rigid contact and limiting between the movable claw 400 and the connecting block 110, utilizing the blocking effect of the shape adaptation.

[0045] For Y-axis translation, the system relies on the combined control of friction and magnetic attraction between the movable jaw 400 and the surface of the connecting block 110. The positive pressure generates friction, and the magnetic attraction strengthens the constraint, enabling a rapid response and continuous resistance to the translation trend.

[0046] The aforementioned constraint methods are not isolated, but rather work together to reasonably restrict all six degrees of freedom of the load-bearing ring 310 unit. When faced with load changes or external disturbances, each constraint structure synchronously adjusts its mechanical balance to ensure the stability of the load-bearing ring 310 unit, thereby enabling the entire load-bearing chain 300 to operate in an orderly manner, improving operational safety and accuracy, and laying a solid foundation for the reliable operation of the equipment.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A variable constraint type safety protection device for self-propelled hoists, characterized in that, Includes a crossbeam (100), with a drive mechanism (200) provided on the upper end face of both sides of the crossbeam (100), and a load-bearing chain (300) provided on the lower end of both sides of the crossbeam (100), the load-bearing chain (300) having multiple load-bearing rings (310) sequentially arranged from top to bottom; The load-bearing ring (310) has two arc-shaped segments (311) distributed vertically and two longitudinal segments (312) distributed horizontally. Each of the two longitudinal segments (312) is provided with a movable claw (400). The two movable claws (400) on the same load-bearing ring (310) are symmetrical. One end of the inner side of the movable claw (400) is provided with a hinge (440) rotatably mounted on the longitudinal segment (312). One end of the outer side of the movable claw (400) is connected to a clutch cable (500). The two clutch cables (500) are spirally connected from bottom to top to the movable claws (400) on one side of the load-bearing ring (310) and the movable claws (400) on the other side of the load-bearing ring (310). The two clutch cables (500) on the same load-bearing chain (300) are connected to the drive mechanism (200) on the same side. The drive mechanism (200) drives the two clutch cables (500) on the same load-bearing chain (300) to pull upward, so as to drive the movable claws (400) on both sides of the same load-bearing ring (310) to overlap the two longitudinal sections (312) of the upper load-bearing ring (310) in the same direction.

2. The variable constraint type safety protection device for self-propelled hoists as described in claim 1, characterized in that, Connecting blocks (110) are respectively provided on the lower end faces of both sides of the crossbeam (100). The top load-bearing ring (310) is sleeved on the connecting block (110) on the same side. The movable claws (400) on both sides of the top load-bearing ring (310) are connected to the two sides of the connecting block (110) through the clutch pull line (500).

3. A variable constraint safety protection device for a self-propelled hoist as described in claim 1, characterized in that, The bottom of the crossbeam (100) is provided with a groove (120) along its length, and the connecting block (110) is slidably disposed in the groove (120).

4. A variable constraint type safety protection device for a self-propelled hoist as described in claim 2, characterized in that, The connecting block (110) has a built-in magnetic coil. When the magnetic coil is energized, it magnetizes the connecting block (110) so that the two movable claws (400) are magnetically attracted to the two sides of the connecting block (110).

5. A variable constraint type safety protection device for a self-propelled hoist as described in claim 1, characterized in that, The drive mechanism (200) includes a drive motor (210) and a winding roller (220). The drive end of the drive motor (210) is provided with a drive gear (230), and one end of the winding roller (220) is provided with a driven gear (240). The drive gear (230) and the driven gear (240) mesh. Two clutch cables (500) on the same side are wound on the winding roller (220) on the same side. The drive motor (210) drives the winding roller (220) to rotate through the drive gear (230) and the driven gear (240) to simultaneously pull the two clutch cables (500) on the same side upward.

6. A variable constraint type safety protection device for a self-propelled hoist as described in claim 1, characterized in that, The hinge (440) includes a mounting sleeve (441) and an L-shaped rotating rod (442). The mounting sleeve (441) is vertically fixed to the middle of the longitudinal section (312). The first end of the L-shaped rotating rod (442) is rotatably mounted inside the mounting sleeve (441). The second end of the L-shaped rotating rod (442) is bent at 90° and extends to the middle of the corresponding load-bearing ring (310). One end of the inner side of the movable claw (400) is connected to the second end of the L-shaped rotating rod (442).

7. A variable constraint safety protection device for a self-propelled hoist as described in claim 6, characterized in that, The movable pawl (400) includes a connecting rod (410) and a locking pawl (420). One end of the connecting rod (410) is fixedly connected to the second end of the L-shaped rotating rod (442), and the locking pawl (420) is connected to the other end of the connecting rod (410). The connecting rod (410) and the locking pawl (420) are set at an obtuse angle. A connecting part (430) for connecting the clutch cable (500) is provided on the outer side of the connection area of ​​the connecting rod (410) and the locking pawl (420). The clutch cable (500) is pulled upward to drive the locking pawl (420) to rotate axially upward with respect to the mounting sleeve (441), and to make the inner side of the locking pawl (420) overlap a longitudinal section (312) of the upper load-bearing ring (310).

8. A variable constraint safety protection device for a self-propelled hoist as described in claim 7, characterized in that, The connecting part (430) includes a fixing lug (431) and a locking bolt (432). The fixing lug (431) is integrally formed on the outside of the connection area of ​​the connecting rod (410) and the locking claw (420). The locking bolt (432) penetrates vertically through the side of the fixing lug (431) away from the connection area of ​​the connecting rod (410) and the locking claw (420) and is used to clamp the clutch cable (500) on the fixing lug (431).

9. A variable constraint safety protection device for a self-propelled hoist as described in claim 8, characterized in that, The inner side of the locking claw (420) is provided with anti-slip stripes (421).

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