Emergency braking device based on hoisting equipment

Abstract

The application belongs to the technical field of high-altitude hoisting and discloses an emergency braking device based on hoisting equipment, which comprises a bearing box and a support installed on the bearing box. The application is characterized in that the power mechanism and the braking mechanism are cooperated, the braking pieces are cross-staggered, the friction heat is staggered and released when the braking work is started, the problem of overheating and softening failure of the braking piece and the problem of fracture of the steel cable are avoided, the contact area of the steel cable in the winding state is far greater than that in the single-side or double-side clamping in the unfolded state, the braking efficiency is higher, the chrome-plated screw thread strip can be deeply inserted into the gap between the steel wires of the steel cable during the braking process, the mechanical engagement is formed, the friction coefficient is improved, the steel cable is prevented from slipping in the inner wall of the braking piece, the four-way clamping of the braking piece is cooperated with the mechanical engagement of the chrome-plated screw thread strip, the composite braking mode of the surface contact and the wire engagement is formed, the braking force is far greater than that of the pure friction braking, the braking distance is shorter, and the reliability is higher.

Description

Technical Field

[0001] This invention belongs to the field of high-altitude hoisting technology, specifically an emergency braking device based on hoisting equipment. Background Technology

[0002] Lifting equipment is a core piece of machinery used in construction, port logistics, mining, and other fields for vertical lifting and horizontal transport of heavy objects. It mainly includes tower cranes, bridge cranes, gantry cranes, and winches, and is primarily composed of a motor, winding rollers, and wire rope. During operation, if the lifting mechanism encounters abnormal situations such as sudden motor power failure, brake coil burnout, control circuit malfunction, or mechanical transmission component breakage, the lifting mechanism will lose its traction restraint on the wire rope, and the suspended load will plummet rapidly under its own weight. Such accidents not only cause severe damage to expensive equipment and building structures but also pose a fatal threat to the lives of personnel working below the lifting area.

[0003] Currently, hoisting mechanisms of lifting equipment commonly use normally closed electromagnetic brakes as emergency protection devices. This brake is installed on the motor output shaft or the high-speed shaft of the reducer and consists of a braking electromagnet, brake shoes, friction pads, and a return spring. During normal operation, the electromagnet is energized, generating attraction that overcomes the spring tension, causing the brake shoes to separate from the brake wheel. When power is lost or a malfunction occurs, the electromagnetic force disappears, and the spring pushes the brake shoes to clamp the brake wheel. This locking of the motor shaft is achieved through frictional torque, which is then transmitted through the gearbox and drum, ultimately stopping the wire rope. The braking force in this method originates from the brake wheel, passes sequentially through the motor shaft, multiple gear pairs within the gearbox, couplings, and the drum shaft, before finally acting on the wire rope on the drum. The entire transmission chain is long and involves many links; the enormous impact load generated during emergency braking is concentrated entirely on the brake wheel and the gears in the gearbox. Under heavy load or overspeed conditions, the instantaneous impact torque can easily exceed the shear strength limit of the gears, leading to broken gear teeth, broken drive shafts, or coupling failure. If any link in the transmission chain breaks, the force transmission path between the brake and the drum is completely cut off. Even if the brake itself is still working normally, it cannot apply any restraining torque to the drum. The suspended load will fall freely under the action of gravity, causing catastrophic consequences. Summary of the Invention

[0004] To address the problems mentioned in the background art, the present invention provides an emergency braking device based on hoisting equipment. This solves the problem that in existing braking schemes, the braking force needs to pass through multiple transmission structures before it can finally act on the wire rope on the drum. The impact load generated during emergency braking is concentrated on the brake wheel and the gears of the gearbox, which can easily exceed the shear strength limit of the gears, leading to broken gear teeth, broken transmission shafts, or coupling failure.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an emergency braking device based on a hoisting equipment, comprising a carrier box and a bracket mounted thereon, wherein a roller is rotatably mounted inside the carrier box, a steel cable is wound on the roller, both ends of the steel cable extend to the outside of the carrier box, and one end of the steel cable is wound onto the drum of the hoisting equipment; The carrier box is equipped with relay mechanisms and braking mechanisms installed at equal intervals. Each relay mechanism is hinged with two symmetrically arranged brake pads. Each relay mechanism, the two brake pads, and the two braking mechanisms form a set of protectors, and the sets of protectors are arranged in a cross shape. Each of the brake pads is located on the outside of the steel cable in the coiled state, and the inner wall of the brake pad is provided with a threaded chrome-plated strip; The carrier box is equipped with a power mechanism inside; The power mechanism is used to drive each braking mechanism to apply a clamping force to the brake pads.

[0006] Preferably, the power mechanism includes a gear rotatably mounted inside the bearing box, and the gear rotatably mounted inside the bearing box is concentric with the roller shaft; The carrier box contains a set of gears that mesh with gear one. The carrier box also contains a motor, and the output shaft of the motor is connected to one of the gears two.

[0007] Preferably, any of the braking mechanisms in the protector includes a protective box fixed inside the carrier box, and a worm gear is rotatably mounted inside the protective box; Each of the aforementioned worm gears is respectively connected to the corresponding gear two transmission; A set of brakes is installed inside the protective box.

[0008] Preferably, any of the brakes includes an outer cylinder that is rotatably engaged with the inner wall of the carrier box, and a worm wheel is provided on the outer periphery of the outer cylinder, the worm wheel meshing with a worm. The outer cylinder has an internal threaded rod that moves through the side of the protective box and abuts against the outside of the brake pad. The inner wall of the bearing box is fixedly fitted with a limit frame, through which the threaded rod moves. The limit frame restricts the threaded rod to move only axially.

[0009] Preferably, each pair of brakes arranged symmetrically vertically forms a group, and each pair of brakes is located inside the protective box and is arranged symmetrically. Each of the worm gears meshes with the corresponding worm. Each worm located on the same axis is a transmission connection, and each worm at its head end is respectively transmission connected to the corresponding gear.

[0010] Preferably, each of the brake pads has two symmetrically arranged grooves on its outer side, and the threaded rods in each group of brakes are located in the corresponding grooves.

[0011] Preferably, any of the relay mechanisms includes a pressure vessel fixed inside the carrier box, and a tension rod is hinged and slidably engaged on both sides of the pressure vessel, with the top of each tension rod connected to the pressure vessel via an elastic element; Each of the tensile rods is hinged to a repeater at its end, and each repeater is hinged to the outer side of the corresponding brake pad.

[0012] Preferably, any of the repeaters includes a repeater rod hinged to the end of the tension rod, one end of the repeater rod being hinged to the outside of the brake pad, and the other end of the repeater rod being movably fitted with a toothed plate, and the internal bearing of the pressure bearing being connected to a gear three that meshes with the toothed plate.

[0013] Preferably, the shafts of the two gears are located on the same horizontal plane, and the two gears mesh with each other, and the two gear plates are movably engaged inside the pressure vessel.

[0014] Preferably, the pressure vessel has a hole for the worm gear to pass through, and the bearing box has a slot for heat dissipation.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention, through the coordinated arrangement of power and braking mechanisms, features cross-shaped brake pads. When braking is activated, frictional heat is generated and released alternately, preventing heat accumulation in a single area and avoiding brake pad overheating and softening failure, as well as steel cable and wire breakage. When the steel cable is clamped in four directions in the coiled state, the contact area is much larger than that of single or double-sided clamping in the unfolded state, resulting in higher braking efficiency. During braking, the threaded chrome-plated strip can penetrate deep into the gaps between the steel wires of the cable, forming a mechanical engagement, increasing the coefficient of friction, and preventing the steel cable from slipping on the inner wall of the brake pads. The four-way clamping of the brake pads, combined with the mechanical engagement of the threaded chrome-plated strip, forms a composite braking mode of surface contact and line engagement, resulting in braking force far greater than pure friction braking, shorter braking distance, and higher reliability.

[0016] This invention, through the combination of a braking mechanism and other structures, achieves a self-locking characteristic between the worm and worm wheel. Even in the event of a power outage or loss of pressure in the motor, the worm wheel will not rotate in the opposite direction, thereby reducing the occurrence of automatic retraction of the threaded rod and ensuring that the clamping force is maintained continuously, thus improving braking reliability. Furthermore, the transmission ratio between the worm and worm wheel can convert a small input force into a large axial thrust, achieving a force amplification effect and further ensuring the braking effect.

[0017] This invention, through the coordinated use of relay mechanisms and other structures, addresses the issue of brake pads pressing against the steel cable when the traction mechanism fails. This causes the steel cable to move axially in opposite directions between two symmetrical brake pads. The brake pads then drive the relay rod to move synchronously, and the gear plate drives the three gears to rotate. However, because the two gears mesh, and the torques generated by the upward and downward forces are equal in magnitude and opposite in direction, the two gears may jam. The force is absorbed internally by the gears, and neither the pressure vessel nor the bearing box bears the reaction force, significantly reducing their load. Since the bearing box does not need to bear the entire braking force, the bracket and external support structure can be designed with lightweight construction. Simultaneously, the relay rod is responsible for force transmission and balance, and does not directly bear frictional heat, resulting in a longer service life. The entire relay forms a closed-loop mechanical system, outputting only clamping force to the brake pads and no reaction force, achieving internal force self-balancing. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the external structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the carrier box of the present invention; Figure 3 This is a schematic diagram of the fit between the roller shaft and the steel cable structure of the present invention; Figure 4 This is a schematic diagram showing the structural distribution of each group of relay mechanisms and braking mechanisms in this invention; Figure 5 This is a schematic diagram showing the structural cooperation between the power mechanism and the braking mechanism of the present invention; Figure 6 This is a schematic diagram showing the cooperation between the braking mechanism and the brake pad structure of the present invention; Figure 7 This is a schematic diagram showing the disassembled structure of the braking mechanism of the present invention; Figure 8 This is a schematic diagram showing the structural cooperation between the relay mechanism and the braking mechanism of the present invention; Figure 9 This is a schematic diagram showing the structural cooperation between the pressure vessel and the repeater of the present invention.

[0019] In the diagram: 1. Bearing box; 11. Roller shaft; 2. Support; 3. Steel cable; 4. Power mechanism; 41. Gear 1; 42. Gear 2; 43. Motor; 5. Relay mechanism; 51. Pressure bearing; 52. Tension rod; 521. Elastic element; 53. Repeater; 531. Relay rod; 532. Tooth plate; 533. Gear 3; 6. Braking mechanism; 61. Protective box; 62. Worm gear; 63. Brake; 631. Outer cylinder; 632. Worm wheel; 633. Limiting frame; 634. Threaded rod; 7. Brake pad; 71. Slide groove. Detailed Implementation

[0020] 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.

[0021] like Figures 1 to 9 As shown, the present invention provides an emergency braking device based on a hoisting equipment, including a carrier box 1 and a bracket 2 mounted thereon. A roller 11 is rotatably mounted inside the carrier box 1. A steel cable 3 is wound on the roller 11. Both ends of the steel cable 3 extend to the outside of the carrier box 1, and one end of the steel cable 3 is wound on the drum of the hoisting equipment. Inside the carrier box 1, relay mechanisms 5 and braking mechanisms 6 are installed at equal intervals. Each relay mechanism 5 is hinged with two symmetrically arranged brake pads 7. Each relay mechanism 5, two brake pads 7, and two braking mechanisms 6 form a set of protectors, and each set of protectors is arranged in a cross shape. Each brake pad 7 is located on the outside of the steel cable 3 in the coiled state, and the inner wall of the brake pad 7 is provided with a threaded chrome-plated strip; The power mechanism 4 is installed inside the carrier box 1; The power mechanism 4 is used to drive each braking mechanism 6 to apply a clamping force to the brake pads 7.

[0022] The above scheme is adopted: the carrier box 1 is installed to the wire release end of the traction mechanism through the bracket 2, so that the steel cable 3 passes through the internal structure of the carrier box 1 first; When the hoisting equipment detects that the drum speed is too high, that is, when there is an abnormal situation such as traction equipment failure, sudden power failure of the power system, brake coil burnout, control circuit failure or mechanical transmission component breakage, the equipment loses its traction ability on the steel cable 3, and the steel cable 3 is quickly released. The power mechanism 4 starts immediately and drives the corresponding braking mechanism 6 to push each brake pad 7 to press against the outer periphery of the steel cable 3 in the winding state. Since one end of the steel cable 3 is connected to the traction mechanism and the other end is connected to the object being lifted through the hook, the steel cable 3 can always press against the outer periphery of the roller 11, thereby reducing the situation of the steel cable 3 winding and disordering, and the brake pad 7 can be more completely pressed against the outer periphery of the steel cable 3. It is important to note that the brake pads 7 are arranged in a cross pattern, so the frictional heat between them and the steel cable 3 is generated and released in an alternating manner. There is no continuous heat accumulation in a single area, which effectively prevents the brake pads 7 from softening and failing due to local overheating. At the same time, it can also protect the surface of the steel cable 3 and reduce the possibility of the steel cable 3 breaking due to overheating. Furthermore, when the steel cable 3 in the coiled state is clamped in four directions by the brake pad 7, the contact area is much larger than that of the single or double clamping in the unfolded state, resulting in higher braking efficiency. The four-way symmetrical pressure makes the radial force surfaces of the steel cable 3 mutually balanced, and the cable will not be deflected or damaged due to single-sided pressure. The threaded chrome-plated strip on the inner wall of the brake pad 7 can penetrate into the gaps between the strands of the steel wires in the cable 3 during braking, forming a mechanical engagement rather than relying solely on planar friction. This significantly increases the coefficient of friction during braking, effectively preventing the cable 3 from slipping on the inner wall of the brake pad 7, thus significantly improving braking efficiency. The four-way clamping of the brake pad 7, combined with the mechanical engagement of the threaded chrome-plated strip, forms a composite braking mode of surface contact and line engagement. The braking force is much greater than that of pure friction braking, resulting in a shorter braking distance and higher reliability.

[0023] The chrome plating layer itself has high hardness and good wear resistance. The thread shape can distribute the clamping force more evenly to each strand of steel wire in the steel cable 3, avoiding damage or premature wear of the steel cable 3 caused by local stress concentration, and extending its service life.

[0024] In addition, the grooves naturally formed between the chrome-plated threaded strips provide a heat dissipation channel for frictional heat. Heat can be conducted and dissipated along the groove direction, which, combined with the staggered heat dissipation effect of the cross-shaped brake pads 7, further reduces the risk of heat accumulation.

[0025] like Figures 1-5 As shown, the power mechanism 4 includes a gear 41 rotatably mounted inside the bearing box 1, and the gear 41 and the roller 11 are concentrically arranged. Inside the carrier box 1 is a set of gears 42 that mesh with gear 41. Inside the carrier box 1 is a motor 43, and the output shaft of the motor 43 is connected to one of the gears 42.

[0026] Using the above scheme: When the device is activated, the motor 43 immediately drives the gear 41 to rotate through any gear 42, and the remaining gears 42 rotate synchronously and drive the corresponding worm gear 62 to rotate. At this time, all braking mechanisms 6 will be activated and perform braking and pressurization work.

[0027] like Figures 1-9 As shown, any braking mechanism 6 in the protector includes a protective box 61 fixed inside the carrier box 1, and a worm gear 62 is rotatably installed inside the protective box 61. Each worm gear 62 is connected to its corresponding gear 42 for transmission. A set of brakes 63 is installed inside the protective box 61.

[0028] Any of the brakes 63 includes an outer cylinder 631 that is rotatably engaged with the inner wall of the carrier box 1, and a worm wheel 632 is provided on the outer periphery of the outer cylinder 631, which meshes with the worm 62. The outer cylinder 631 has an internal threaded rod 634. The threaded rod 634 moves through the side of the protective box 61 and abuts against the outside of the brake pad 7. The inner wall of the bearing box 1 is fixedly equipped with a limit frame 633. The threaded rod 634 moves through the limit frame 633. The limit frame 633 restricts the threaded rod 634 to move only axially.

[0029] Each pair of brakes 63 that are symmetrically positioned vertically forms a group, and each pair of brakes 63 is located inside the protective box 61 and is arranged symmetrically. Each worm gear 632 meshes with its corresponding worm 62; Each worm 62 located on the same axis is a transmission connection, and each worm 62 at the beginning is respectively connected to the corresponding gear 42.

[0030] Using the above scheme: When the device is activated, each gear 42 drives the corresponding worm 62 to rotate. During this period, all worm wheels 632 are rotating, and the outer cylinder 631 on them moves synchronously. However, since the threaded rod 634 is restricted by the limit frame 633, it can only move axially. During this period, the threaded rod 634 can extend outward through the threaded engagement with the outer cylinder 631 and push the brake pad 7 to gradually press the outer periphery of the steel cable 3 in the coiled state, thereby achieving the braking purpose. It is worth noting that the worm 62 and worm wheel 632 have a self-locking characteristic. Even if the motor 43 experiences a power outage or loss of pressure, the worm wheel 632 will not rotate in the opposite direction, thereby reducing the occurrence of the threaded rod 634 automatically retracting. The clamping force generated can be maintained continuously, improving the reliability of braking. The transmission ratio between the worm 62 and the worm wheel 632 can convert a small input force into a large axial thrust, achieving a force amplification effect and further ensuring the braking effect.

[0031] like Figures 1-9 As shown, any one of the relay mechanisms 5 includes a pressure vessel 51 fixed inside the bearing box 1. A tension rod 52 is hinged and slidably engaged on both sides of the pressure vessel 51. The top of each tension rod 52 is connected to the pressure vessel 51 through an elastic element 521. Each tension rod 52 has a repeater 53 hinged to its end, and each repeater 53 is hinged to the outside of the corresponding brake pad 7.

[0032] Using the above scheme: when the brake pad 7 is pushed to perform braking work, the repeater 53 hinged to it is displaced synchronously, and will push the bottom end of the tension rod 52, causing the top end of the tension rod 52 to slide upward to the top of the pressure vessel 51, and cannot rise again; When the traction mechanism fails, the steel cable 3 is rapidly unwound. Once the brake pads 7 are pressed against the outer circumference of the steel cable 3 in the wound state, the moving steel cable 3 experiences a strong impact force, which will inevitably cause each pair of symmetrically arranged brake pads 7 to move axially in opposite directions. Figure 9 The movement trajectory of the steel cable 3 after it is unwound and wound onto the roller 11, as well as the movement trajectory of the two brake pads 7, are shown in the figure. Under the influence of this impact force, if the two brake pads 7 are rigidly connected to the braking mechanism 6 or other existing pressurizing equipment, the impact force will act directly on the pressurizing equipment. Even if it does not damage the pressurizing equipment, the connection between the pressurizing equipment and the carrier box 1 will deform or even crack, causing the pressurizing equipment to tilt, thereby reducing its pressurizing effect on the brake pads 7. At the same time, the braking force will also decrease. However, in actual operation, when one of the brake pads 7 moves upward, the lifting force will be preferentially transmitted to the repeater 53, and then transmitted by the repeater 53 to the tension rod 52 and the pressure bearing 51 connected together. Meanwhile, the symmetrical brake pad 7 on the other side moves downward. The downward force is preferentially transmitted to the pressure bearing 51 through the repeater 53 and the tension rod 52 on the other side, rather than directly to the braking mechanism 6 or the bearing box 1. This greatly reduces the cost required to produce the bearing box 1, and at the same time, it further improves the stability of the braking capacity and reduces the risk of damage to the braking mechanism 6 or other alternative pressurizing equipment.

[0033] like Figures 1-9 As shown, any repeater 53 includes a repeater rod 531 hinged to the end of the tension rod 52. One end of the repeater rod 531 is hinged to the outside of the brake pad 7, and the other end of the repeater rod 531 is movably fitted with a toothed plate 532. The internal bearing of the pressure bearing 51 is connected to a gear 533 that meshes with the toothed plate 532.

[0034] The shafts of the two gears 533 are located on the same horizontal plane, and the two gears 533 mesh with each other. Both gear plates 532 are movably engaged inside the pressure vessel 51.

[0035] The pressure vessel 51 has a hole for the worm gear 62 to pass through, and the bearing box 1 has a slot for heat dissipation.

[0036] Using the above scheme: When the two brake pads 7 move up and down due to the unwinding of the steel cable 3, the two brake pads 7 will drive the corresponding two relay rods 531 to move synchronously. However, it should be noted that the toothed plates 532 at the ends of the two relay rods 531 will also drive the corresponding two gears 533 to rotate synchronously. However, since the two gears 533 mesh with each other, and the torques generated by the upward and downward forces are equal in magnitude and opposite in direction, the two gears 533 may jam. The force is absorbed by the inside of the gears 533, and the external pressure vessel 51 and the bearing box 1 do not bear the reaction force, significantly reducing the load on the pressure vessel 51 and the bearing box 1. The relay rods 531 and the tension rods 52 can also reduce the displacement of the brake pads 7. The mutual cancellation of symmetrical forces also reduces the transmission of periodic impacts to the pressure vessel 51 and the bearing box 1, making the braking process smoother. Since the bearing box 1 does not need to bear the entire braking force, the bracket 2 and the external support structure can be designed with lightweight features. Meanwhile, the relay rod 531 is responsible for force transmission and balance, and does not directly bear frictional heat, thus having a longer service life. The entire repeater 53 forms a closed-loop mechanical system, outputting only clamping force to the brake pad 7 without outputting reaction force, achieving self-balancing of internal forces.

[0037] like Figure 7 As shown, each brake pad 7 has two symmetrically arranged grooves 71 on its outer side, and the threaded rods 634 in each group of brakes 63 are located in the corresponding grooves 71.

[0038] The above solution involves the threaded rod 634 contacting the outer periphery of the brake pad 7 via the groove 71, rather than a rigid connection. This allows the brake pad 7 to maintain some mobility even under the pressure release of the repeater 53. Even if the brake pad 7 experiences a slight rise or fall due to the force on the steel cable 3, the threaded rod 634 remains in contact with the brake pad 7 via the groove 71, ensuring uninterrupted pressure transmission. The clearance design of the groove 71 also absorbs manufacturing errors, assembly deviations, and thermal expansion, reducing stringent precision requirements and preventing jamming due to deformation.

[0039] Working principle and usage process of this invention: The support box 1 is installed to the wire release end of the traction mechanism through the bracket 2, so that the steel cable 3 passes through the internal structure of the support box 1 first. When the hoisting equipment detects that the drum speed is too high, that is, when there is an abnormal situation such as traction equipment failure, sudden power failure of the power system, brake coil burnout, control circuit failure or mechanical transmission component breakage, the equipment loses its traction ability on the steel cable 3, and the steel cable 3 is quickly released. The power mechanism 4 starts immediately and drives the corresponding braking mechanism 6 to push each brake pad 7 to press against the outer periphery of the steel cable 3 in the winding state. Since one end of the steel cable 3 is connected to the traction mechanism and the other end is connected to the object being lifted through the hook, the steel cable 3 can always press against the outer periphery of the roller 11, thereby reducing the situation of the steel cable 3 winding and disordering, and the brake pad 7 can be more completely pressed against the outer periphery of the steel cable 3. Each group of brake pads 7 is arranged in a cross pattern, which increases the contact area when the steel cable 3 is clamped in four directions by the brake pads 7 in the winding state. Among them, the threaded chrome-plated strip set on the inner wall of the brake pad 7 can penetrate into the gap between the steel wires of the cable 3 during braking, forming mechanical engagement rather than simply relying on planar friction, which greatly improves the coefficient of friction during braking.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An emergency braking device based on hoisting equipment, comprising a carrier box (1) and a bracket (2) mounted thereon, characterized in that: The bearing box (1) is rotatably mounted with a roller (11), and a steel cable (3) is wound on the roller (11). The two ends of the steel cable (3) extend to the outside of the bearing box (1), and one end of the steel cable (3) is wound on the drum of the hoisting equipment. The carrier box (1) is equipped with relay mechanism (5) and braking mechanism (6) installed at equal intervals inside. Each relay mechanism (5) is hinged with two symmetrically arranged brake pads (7). Each relay mechanism (5), two brake pads (7) and two braking mechanisms (6) form a set of protectors. Each set of protectors is arranged in a cross shape. Each of the brake pads (7) is located on the outside of the steel cable (3) in the coiled state, and the inner wall of the brake pad (7) is provided with a threaded chrome-plated strip; The power mechanism (4) is installed inside the carrier box (1); The power mechanism (4) is used to drive each braking mechanism (6) to apply a clamping force to the brake pads (7).

2. The emergency braking device based on hoisting equipment according to claim 1, characterized in that: The power mechanism (4) includes a gear (41) rotatably installed inside the bearing box (1), and the gear (41) and the roller (11) are concentrically arranged; The bearing box (1) is equipped with a set of gears (42) that mesh with gear one (41). The bearing box (1) is equipped with a motor (43), and the output shaft of the motor (43) is connected to one of the gears (42) in a transmission connection.

3. The emergency braking device based on hoisting equipment according to claim 2, characterized in that: Any of the braking mechanisms (6) in the protector includes a protective box (61) fixed inside the carrier box (1), and a worm gear (62) is rotatably mounted inside the protective box (61). Each of the worm gears (62) is connected to the corresponding gear two (42) for transmission; A set of brakes (63) is installed inside the protective box (61).

4. The emergency braking device based on hoisting equipment according to claim 3, characterized in that: Any of the brakes (63) includes an outer cylinder (631) that is rotatably engaged with the inner wall of the carrier box (1), and a worm wheel (632) is provided on the outer periphery of the outer cylinder (631), the worm wheel (632) meshing with the worm (62); The outer cylinder (631) has a threaded rod (634) inside. The threaded rod (634) moves through the side of the protective box (61) and abuts against the outside of the brake pad (7). The inner wall of the bearing box (1) is fixedly equipped with a limit frame (633). The threaded rod (634) moves through the limit frame (633). The limit frame (633) restricts the threaded rod (634) to move only axially.

5. The emergency braking device based on hoisting equipment according to claim 4, characterized in that: Each pair of brakes (63) arranged symmetrically in the upper and lower parts form a group, and each pair of brakes (63) is located inside the protective box (61) and is arranged symmetrically. Each of the worm gears (632) meshes with the corresponding worm (62); Each of the worms (62) located on the same axis is a transmission connection, and each of the worms (62) at the head end is respectively connected to the corresponding gear (42) in a transmission connection.

6. The emergency braking device based on hoisting equipment according to claim 5, characterized in that: Each of the brake pads (7) has two symmetrically arranged grooves (71) on its outer side, and the threaded rods (634) in each group of brakes (63) are located in the corresponding grooves (71).

7. The emergency braking device based on hoisting equipment according to claim 3, characterized in that: Each of the relay mechanisms (5) includes a pressure vessel (51) fixed inside the bearing box (1), and a tension rod (52) is hinged and slidably engaged on both sides of the pressure vessel (51). The top of each tension rod (52) is connected to the pressure vessel (51) through an elastic element (521). Each of the tensile bars (52) has a repeater (53) hinged to its end, and each of the repeaters (53) is hinged to the outside of the corresponding brake pad (7).

8. The emergency braking device based on hoisting equipment according to claim 7, characterized in that: Each of the repeaters (53) includes a repeater rod (531) hinged to the end of the tension rod (52), one end of the repeater rod (531) being hinged to the outside of the brake pad (7), and the other end of the repeater rod (531) being movably fitted with a toothed plate (532), and the internal bearing of the pressure bearing (51) being connected to a gear three (533) that meshes with the toothed plate (532).

9. The emergency braking device based on hoisting equipment according to claim 8, characterized in that: The shafts of the two gears (533) are located on the same horizontal plane, and the two gears (533) mesh with each other. The two gear plates (532) are movably engaged inside the pressure vessel (51).

10. The emergency braking device based on hoisting equipment according to claim 9, characterized in that: The pressure vessel (51) has a hole for the worm gear (62) to pass through, and the bearing box (1) has a slot for heat dissipation.

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