A kind of anti-falling safety device for crane and crane thereof
Patent Information
- Application Number
- CN202610843174.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-06-11
- Publication Date
- 2026-08-18
AI Technical Summary
[0003]当前主流起重机防坠落装置多安装于吊钩位置，仅针对吊载下坠进行被动防护，存在上段钢丝绳防护盲区，无法覆盖臂头定滑轮至卷扬装置的断绳故障工况
1、该一种起重机用防坠落安全装置及其起重机，通过机械触发模块和防坠模块的设置，使该装置具备了机械触发式防坠的效果，通过转动板、配重敲击块、弧面受击块、防坠夹持块和第一弹簧的配合设置，在使用的过程中可以在钢丝绳断裂导致臂端定滑轮转速急增时，快速触发防坠夹持块夹持钢丝绳，从而起到了覆盖臂头定滑轮至卷扬装置的上段钢丝绳防护盲区的作用，达到了防止断绳后吊钩和吊载自由坠落的目的。
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Figure CN122585855A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of crane technology, and more specifically, to a fall protection safety device for cranes and the crane thereof. Background Technology
[0002] Cranes are widely used in construction, mining, municipal and port engineering fields. They mainly rely on the telescopic boom and wire rope winch mechanism to complete the lifting, hoisting and luffing of heavy objects. The wire rope is the core load-bearing and force-transmitting component of the crane, and its working state is directly related to the safety of hoisting operations. Crane fall protection devices are safety protection components used in conjunction with lifting equipment. They are mainly installed on the crane boom and wire rope working area, and work in conjunction with the crane body structure to limit and protect the crane hook and the load, avoiding the risk of falling during the lifting operation.
[0003] Currently, most mainstream crane fall arrestors are installed at the hook position, providing only passive protection against load falls. This creates a blind spot in the upper section of the wire rope, failing to cover situations where the rope breaks between the boom pulley and the winch. During normal crane operation, the upper section of the wire rope between the boom pulley and the winch is constantly under tension. Subjected to reciprocating tension, friction and wear, environmental corrosion, and boom extension / retraction disturbances, it is highly susceptible to wire breakage, slack rope, and partial fractures. If this section of the wire rope fails and breaks, the hook and load will lose restraint and fall freely, potentially causing equipment damage, personal injury, and other serious safety accidents, making operational safety difficult to guarantee. Therefore, it is urgent to solve these problems. Summary of the Invention
[0004] In view of the above situation and to overcome the defects of the prior art, the present invention provides a fall protection safety device for cranes and a crane thereof, aiming to solve the problems in the background art.
[0005] To achieve the above objectives, the present invention provides the following technical solution: a fall protection safety device for cranes, characterized in that it includes a mounting frame, a boom end fixed pulley, a fall protection module, a mechanical trigger module, and an electrical sensor trigger module. The mounting frame is fixedly installed at the end of the boom. The boom end fixed pulley is rotatably connected to the inner wall of the mounting frame via a shaft. The fall protection module is disposed on the mounting frame. An inner shaft is fixedly connected to the outer surface of the mounting frame. The mechanical trigger module is installed at the end of the shaft of the boom end fixed pulley and is located inside the inner shaft. The electrical sensor trigger module is fixedly installed on the upper surface of the boom.
[0006] Preferably, the fall arrest module includes a fall arrest module support plate, an inclined guide rail, a fall arrest clamping block, a first spring, a double-ended electric telescopic rod, a connecting rod, a limiting pin, rollers, guide wheels, and a protrusion. The fall arrest module support plate is rotatably connected to the outer surface of the inner shaft via an outer bushing. The inclined guide rail is fixedly connected to the inner sidewall of the fall arrest module support plate. The fall arrest clamping block is slidably connected to the outer side of the inclined guide rail. One end of the first spring is installed on the upper surface of the fall arrest clamping block. The protrusion is fixed to the inner sidewall of the fall arrest module support plate and located above the inclined guide rail. The other end of the first spring is installed on the lower surface of the protrusion. The double-ended electric telescopic rod is fixed to the outer surface of the fall arrest module support plate. The double-ended electric telescopic rod has a telescopic shaft inside. The connecting rod is hinged to one end of the telescopic shaft. The limiting pin is inserted into the inner sidewall of the inclined guide rail. The end of the limiting pin passes through the fall arrest module support plate and is hinged to one end of the connecting rod. The rollers are rotatably connected to the end of the limiting pin. Two symmetrically arranged guide wheels are rotatably connected to the lower side of the inner sidewall of the fall arrest module support plate.
[0007] Preferably, the mechanical triggering module includes a rotating plate, a limiting shaft, a movable arm, a counterweight striking block, a connecting block, and a second spring. The rotating plate is fixedly installed at both ends of the shaft of the fixed pulley at the end of the arm. The limiting shaft is fixed on the outer surface of the rotating plate. The middle part of the movable arm is rotatably connected to the outer surface of the limiting shaft. The counterweight striking block is fixed at one end of the movable arm, and the other end of the movable arm is hinged to the connecting block. A second spring is installed between the two sets of centrally symmetrical limiting shafts, movable arms, counterweight striking blocks, and connecting blocks.
[0008] Preferably, the electro-sensing trigger module includes a support bracket, a guide roller, a speed sensor, an outer convex shaft, a support plate, a pressure roller, a torsion spring, and an angle sensor. The support bracket is fixedly installed on the crane. The guide roller is rotatably connected to the inner side of the support bracket via a rotating shaft. The speed sensor is fixed to the outer surface of the support bracket. The outer convex shaft is fixed to the end of the support bracket away from the speed sensor. The support plate is rotatably connected to the outer surface of the outer convex shaft. The pressure roller is rotatably connected to one end of the support plate via a shaft. The torsion spring is sleeved on the outer side of the outer convex shaft. Both ends of the torsion spring are fixed to the outer convex shaft and the inner sidewall of the support plate, respectively. The angle sensor is fixed to the outer surface of the support plate.
[0009] Preferably, the inclined guide rail is inclined, the outer surface of the anti-slip clamping block is provided with anti-slip teeth, and there are two inclined guide rails and two anti-slip clamping blocks arranged symmetrically.
[0010] Preferably, the lower surface of the fall arresting clamp block has a limiting groove, the outer surface of the roller is engaged with the inside of the limiting groove, the outer surface of the fall arresting module support plate is fixedly connected to an outer plate, the outer surface of the fall arresting clamp block is fixedly connected to a reset rod, the outer surface of the outer plate has a slot adapted to the reset rod, and the end of the reset rod passes through the slot and is placed on the outside of the outer plate.
[0011] Preferably, there are two mechanical trigger modules arranged symmetrically. An arc-shaped impact block is fixedly installed at the end of the telescopic shaft away from the connecting rod. The arc-shaped impact block is positioned towards the center of the mechanical trigger module. A protective cover is fixedly connected to the outer surface of the anti-fall module support plate located outside the outer bushing.
[0012] Preferably, the detection end of the speed sensor is fixedly connected to one end of the guide roller shaft, and the detection end of the angle sensor is fixedly connected to the inner sidewall of the outer convex shaft.
[0013] Preferably, a limiting plate is fixedly connected to the outer surface of the rotating plate at the end of the movable arm, and the outer surface of the end of the movable arm abuts against the outer surface of the rotating plate.
[0014] A crane includes a crane body, a boom, a winch device, a wire rope, and a hook. The boom is disposed on the upper side of the crane body, the winch device is installed on the upper side of the crane body and is correspondingly disposed at one end of the boom, one end of the wire rope is wound around the winch device, and the hook is fixedly installed at one end of the wire rope. The crane is characterized in that: the crane further includes a fall protection safety device as claimed in the claims; the mounting bracket of the fall protection safety device is fixedly connected to the end of the boom, and the lug of the electrical sensing trigger module is fixed to the upper surface of the boom; the middle part of the wire rope is placed between the upper side of the guide roller and the lower side of the pressure roller, and the wire rope is wound around the outer surface of the boom-end fixed pulley at the boom end, with the wire rope located between two guide rollers; a central control module is provided in the control room of the crane body; the boom has multiple sections, each section of the boom corresponding to an electrical sensing trigger module; a drag chain is installed on the outer surface of each section of the boom, and a wire is provided inside the drag chain; the double-ended electric telescopic rod, speed sensor, and angle sensor are all electrically connected to the central control module through wires.
[0015] Compared with the prior art, the present invention provides a fall protection safety device for cranes and a crane thereof, which has the following beneficial effects: 1. This crane fall protection safety device and crane, through the setting of a mechanical trigger module and a fall protection module, enables the device to have the effect of mechanical trigger fall protection. Through the coordinated setting of a rotating plate, a counterweight striking block, an arc-shaped impact block, a fall protection clamping block and a first spring, during use, when the wire rope breaks and the speed of the fixed pulley at the boom end increases rapidly, the fall protection clamping block is quickly triggered to clamp the wire rope, thereby covering the blind spot of the upper section of the wire rope from the fixed pulley at the boom end to the winch device, and achieving the purpose of preventing the hook and the load from falling freely after the rope breaks.
[0016] 2. This type of fall protection safety device for cranes and the crane thereof, through the setting of an electric sensor trigger module and a central control module, enables the device to have a sensor-based intelligent trigger fall protection effect. Through the coordinated setting of guide rollers, speed sensors, angle sensors, central control module and double-end electric telescopic rods, it can monitor the tension and speed changes of the wire rope in real time during use, detect rope slack or rope breakage faults in advance and quickly trigger the fall protection action, thereby achieving the function of accurately covering the fault conditions of the upper section of the wire rope, and achieving the purpose of improving the fall protection response speed and operational safety.
[0017] 3. This type of fall protection safety device for cranes and the crane thereof, by setting up corresponding electrical sensor trigger modules and cable chains for multiple boom sections, enables the device to monitor the entire wire rope and adapt to boom extension and retraction. Through the coordinated setup of several electrical sensor trigger modules, cable chains and a central control module, the device can comprehensively monitor the wire ropes on multiple boom sections during use, and protect the wires from damage during boom extension and retraction. This eliminates the blind spot in the upper section of the wire rope protection under multi-boom operating conditions, thereby improving the reliability of fall protection in complex operating environments. Attached Figure Description
[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the boom structure of the present invention; Figure 3 This is a schematic diagram of the overall structure of the boom end of the present invention; Figure 4 This is a schematic diagram of the end portion of the boom of the present invention; Figure 5 For the present invention Figure 4 Schematic diagram of the structure at point A; Figure 6 This is a three-dimensional structural diagram of the anti-fall module of the present invention; Figure 7 This is a schematic diagram of the structure of the inner component of the fall arrest module support plate of the present invention; Figure 8 This is a schematic diagram of the side cross-section of the fall protection module of the present invention; Figure 9 This is a three-dimensional structural schematic diagram of the anti-fall clamping block of the present invention; Figure 10 This is a schematic diagram of the explosion of the electrical sensing trigger module of the present invention; Figure 11 For the present invention Figure 10 A schematic diagram of the structure at point B.
[0019] In the diagram: 1. Crane body; 2. Boom; 3. Winch; 4. Wire rope; 5. Hook; 6. Mounting frame; 7. Boom end pulley; 8. Inner shaft; 9. Outer bushing; 10. Fall arrestor module support plate; 11. Guide wheel; 12. Inclined guide rail; 13. Fall arrestor clamping block; 14. Anti-slip teeth; 15. Protrusion; 16. First spring; 17. Double-ended electric telescopic rod; 18. Telescopic shaft; 19. Connecting rod; 20. Limit pin; 21. 21. Roller; 22. Limiting groove; 23. Outer plate; 24. Reset rod; 25. Arc-shaped impact block; 26. Rotating plate; 27. Limiting shaft; 28. Movable arm; 29. Counterweight impact block; 30. Connecting block; 31. Second spring; 32. Limiting plate; 33. Protective cover; 34. Mounting bracket; 35. Guide roller; 36. Speed sensor; 37. Outer convex shaft; 38. Support plate; 39. Pressure roller; 40. Torsion spring; 41. Angle sensor. Detailed Implementation
[0020] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0021] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.
[0022] In this invention, unless otherwise stated, the directional terms such as "up" and "down" generally refer to the directions shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" generally refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.
[0023] Please see Figures 1 to 9This embodiment provides a fall protection safety device for cranes, including a crane body 1, a boom 2, a hoisting device 3, a wire rope 4, and a hook 5; a mounting bracket 34 is fixed to the end of the boom 2, a fixed pulley 7 at the boom end is rotatably connected to the inner side wall of the mounting bracket 34, an inner shaft 8 is fixed to the outer surface of the mounting bracket 34, an outer bushing 9 is rotatably connected to the outer surface of the inner shaft 8, and a protective cover 33 is fixed to the outer side of the outer bushing 9; the fall protection module includes a fall protection module support plate 10, a guide wheel 11, an inclined guide rail 12, a fall protection clamping block 13, and an anti-slip device. 14. Gear 15. Protrusion 16. First spring 16. Double-ended electric telescopic rod 17. Telescopic shaft 18. Connecting rod 19. Limiting pin 20. Roller 21. Limiting groove 22. Outer plate 23. Reset rod 24. Arc-shaped impact block 25; The mechanical triggering module includes a rotating plate 26. Limiting shaft 27. Movable arm 28. Counterweight striking block 29. Connecting block 30. Second spring 31. Limiting plate 32; The anti-fall module support plate 10 is rotatably connected to the inner shaft 8 through the outer shaft sleeve 9. Guide wheels 11 are symmetrically arranged on the inner side wall. Inclined guide rail 12 is inclined and fixed to the inner side wall of the anti-fall module support plate 10. The anti-fall clamping block 13 is slidably connected to the inclined guide rail 12 and has anti-slip teeth 14 on its outer surface. The protrusion 15 is fixed above the inclined guide rail 12. The first spring 16 connects the protrusion 15 and the anti-fall clamping block 13. The double-ended electric telescopic rod 17 is fixed to the outer surface of the anti-fall module support plate 10. The telescopic shaft 18 is hinged to the connecting rod 19. The limiting pin 20 passes through the inclined guide rail 12 and has a roller 21 at its end. The lower surface of the anti-fall clamping block 13 has a limiting groove 22. The outer plate 23 is fixed to the inner side wall of the anti-fall module support plate 10. The fall arrestor module support plate 10 and the reset rod 24 are fixed to the fall arrestor clamping block 13 and pass through the outer plate 23; the arc-shaped impact block 25 is fixed to one end of the telescopic shaft 18; the rotating plate 26 is fixed to both ends of the arm end fixed pulley 7 shaft; the limiting shaft 27 is fixed to the rotating plate 26; the movable arm 28 is rotatably connected to the limiting shaft 27; the end is provided with a counterweight striking block 29; the connecting block 30 is hinged to the movable arm 28; the second spring 31 connects the two connecting blocks 30; and the limiting plate 32 restricts the rotation of the movable arm 28, thus forming the core structure of the mechanically triggered fall arrestor.
[0024] Specifically, during normal lifting, the wire rope 4 pulls the fixed pulley 7 at the arm end at a constant speed, the counterweight striking block 29 has low centrifugal force, the second spring 31 keeps the movable arm 28 retracted, and the limit pin 20 is engaged in the limit groove 22 to lock the anti-fall clamping block 13; when the wire rope 4 suddenly breaks, the fixed pulley 7 at the arm end instantly overspeeds, the centrifugal force of the counterweight striking block 29 surges and it is thrown outward, striking the arc-shaped impact block 25, pushing the telescopic shaft 18 to retract, driving the connecting rod 19 to pull the limit pin 20 out of the limit groove 22; the first spring 16 is released instantly, pushing the anti-fall clamping block 13 to slide down along the inclined guide rail 12 and move closer to each other, the anti-slip teeth 14 bite into the wire rope 4, and further tighten with the inertia of the fall, realizing instantaneous mechanical locking. The inclined guide rail 12 is set at an inclination angle of 25°-45° to ensure that the downward stroke and clamping force are matched. The anti-fall clamping block 13 is made of high-hardness alloy material to improve the biting force and wear resistance.
[0025] Please see Figure 1 , Figure 2 , Figure 10 , Figure 11 The crane uses a fall protection safety device. An electrical sensing trigger module is installed on the upper surface of the boom 2. This module includes a mounting frame 34, guide rollers 35, a speed sensor 36, an external convex shaft 37, a support plate 38, a pressure roller 39, a torsion spring 40, and an angle sensor 41. The mounting frame 34 is fixed to the boom 2, the guide rollers 35 are rotatably connected to the mounting frame 34, and the speed sensor 36 detects the speed of the guide rollers 35. The external convex shaft 37 is fixed to the mounting frame 34, the support plate 38 is rotatably connected to the external convex shaft 37, the pressure roller 39 is rotatably connected to the support plate 38, the torsion spring 40 is sleeved on the external convex shaft 37 to provide preload, and the angle sensor 41 detects the angle of the support plate 38. A wire rope 4 is placed between the guide rollers 35 and the pressure roller 39. Multiple sets of electrical sensing trigger modules are correspondingly installed in the multi-section boom 2. A central control module is installed in the control room of the crane body 1. The double-ended electric telescopic rod 17, the speed sensor 36, and the angle sensor 41 are all electrically connected to the central control module, forming a key intelligent monitoring and fall protection structure.
[0026] Specifically, during normal operation, the torsion spring 40 causes the pressure roller 39 to adhere to the wire rope 4, and the speed sensor 36 and angle sensor 41 collect speed and tension signals in real time and transmit them to the main control module. When the wire rope 4 becomes loose or breaks, the speed changes suddenly and the tension becomes abnormal. The sensors quickly provide feedback signals, and the main control module immediately controls the double-end electric telescopic rod 17 to move, the linkage limit pin 20 to unlock, and the first spring 16 pushes the anti-fall clamping block 13 to clamp the wire rope 4, realizing intelligent prediction and rapid anti-fall, and multiple modules monitor the entire section.
[0027] Please see Figures 1-11 The crane is equipped with a fall protection safety device. The boom 2 is configured as a multi-section telescopic structure. The electrical sensing trigger module includes a mounting frame 34, guide roller 35, speed sensor 36, external convex shaft 37, support plate 38, pressure roller 39, torsion spring 40, and angle sensor 41. Multiple sets of electrical sensing trigger modules are set for each section. A central control module is set in the control room of the crane body 1. Cable chains are installed on the outer surface of each section of boom 2. Wires are laid in the cable chains. The double-ended electric telescopic rod 17, speed sensor 36, and angle sensor 41 are all electrically connected to the central control module through the wires in the cable chains. The wire rope 4 passes sequentially between the guide roller 35 and pressure roller 39 on each section of boom 2, forming a linkage structure for long-distance full-section monitoring and adaptive telescopic movement.
[0028] Specifically, during boom 2 telescopic operation, the cable chain telescopically extends and retracts with boom 2 to protect the conductor wire and prevent damage from pulling; multiple sets of electrical sensor trigger modules monitor the speed, tension and attitude of wire rope 4 in real time in segments, and the signals are synchronously fed back to the central control module; when any section experiences slack rope, broken wire or breakage, the central control module immediately activates the boom end anti-fall module to achieve rapid fault response of the entire wire rope 4, eliminate blind spots in segment monitoring, and adapt to complex working conditions of long distance and multi-section telescopic operation.
[0029] In summary, when using the overall equipment: first check the connection status of each structure to ensure that the wire rope 4 is sequentially wound around the winch device 3, the guide rollers 35 and pressure rollers 39 on each section of the boom 2, the outer surface of the fixed pulley 7 at the boom end, and between the two guide wheels 11, and finally fixedly connected to the hook 5; at this time, the torsion spring 40 applies a pre-tightening force to the support plate 38, so that the pressure roller 39 is tightly attached to the wire rope 4, the first spring 16 applies a downward pre-tightening force to the anti-fall clamping block 13, and the roller 21 at the end of the limit pin 20 is engaged in the limit groove 22 of the anti-fall clamping block 13 and is in a compressed state, and the entire device is in a ready-to-trigger state. During operation, the hoisting device 3 of the crane body 1 winds up and unwinds the wire rope 4, driving the hook 5 to rise and fall. The fixed pulley 7 at the boom end rotates with the wire rope 4, and the mechanical trigger module rotates accordingly. When the wire rope 4 breaks, if the upper section of the wire rope 4 near the fixed pulley 7 at the boom end breaks, the counterweight striking block 29 of the mechanical trigger module strikes the arc-shaped impact block 25, triggering the anti-fall module to clamp the wire rope 4. The wire rope 4 and the suspended load tend to move in free fall, and the falling speed gradually increases. The rotation speed of the fixed pulley 7 at the boom end increases, the rotation speed of the rotating plate 26 gradually increases, and the centrifugal force of the counterweight striking block 29 at one end of the movable arm 28 gradually increases. When it exceeds the elastic force of the second spring 31 on the ends of the two movable arms 28, the counterweight striking block 29 moves outward relative to the rotation center of the rotating plate 26. If it moves outward too much, it will strike the arc. The outer surface of the impact block 25 causes the telescopic shaft 18 to move towards the limit pin 20 within the double-ended electric telescopic rod 17. The connecting rod 19 causes the limit pin 20 to be subjected to an outward force. When the force is large enough, the roller 21 is forced to move out of the limit groove 22. At this time, the first spring 16 pushes the two anti-fall clamping blocks 13 downward. During the downward movement of the two anti-fall clamping blocks 13, due to the inclined setting of the inclined guide rail 12, they will gradually approach each other, thereby clamping the wire rope 4. After being subjected to friction, they will continue to move downward due to inertia, thus clamping the wire rope 4 better and preventing the hook 5 and the suspended object from falling. The guide roller 35 of the electric sensor trigger module rotates with the extension and retraction of the wire rope 4. The speed sensor 36 detects the speed of the guide roller 35 in real time, and the angle sensor 41 detects the rotation angle of the support plate 38. When the wire rope 4 breaks, its transmission speed and posture differ significantly from normal conditions. If the wire rope 4 above the boom 2 malfunctions, the sensor of the electrical sensing trigger module transmits an abnormal signal to the main control module, which then activates the double-ended electric telescopic rod 17 to trigger the fall arrestor. After the operation is completed, the fall arrestor clamping block 13 is pulled up along the inclined guide rail 12 by the reset rod 24, causing the roller 21 to re-engage in the limit groove 22, thus completing the device reset.
[0030] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A fall protection safety device for cranes, characterized in that: The system includes a mounting frame (6), a boom end fixed pulley (7), a fall protection module, a mechanical trigger module, and an electrical sensor trigger module. The mounting frame (6) is fixedly installed at the end of the boom (2). The boom end fixed pulley (7) is rotatably connected to the inner wall of the mounting frame (6) via a shaft. The fall protection module is installed on the mounting frame (6). An inner shaft (8) is fixedly connected to the outer surface of the mounting frame (6). The mechanical trigger module is installed at the end of the shaft of the boom end fixed pulley (7) and is located inside the inner shaft (8). The electrical sensor trigger module is fixedly installed on the upper surface of the boom (2).
2. The fall protection device for cranes according to claim 1, characterized in that: The fall protection module includes a fall protection module support plate (10), an inclined guide rail (12), a fall protection clamping block (13), a first spring (16), a double-ended electric telescopic rod (17), a connecting rod (19), a limiting pin (20), a roller (21), a guide wheel (11), and a protrusion (15). The fall protection module support plate (10) is rotatably connected to the outer surface of the inner shaft (8) through an outer bushing (9). The inclined guide rail (12) is fixedly connected to the inner side wall of the fall protection module support plate (10). The fall protection clamping block (13) is slidably connected to the outer side of the inclined guide rail (12). One end of the first spring (16) is installed on the upper surface of the fall protection clamping block (13). The protrusion (15) is fixed to the fall protection module support plate (10). The inner wall of the first spring (16) is located above the inclined guide rail (12). The other end of the first spring (16) is installed on the lower surface of the protrusion (15). The double-ended electric telescopic rod (17) is fixed on the outer surface of the anti-fall module support plate (10). The double-ended electric telescopic rod (17) is provided with a telescopic shaft (18). The connecting rod (19) is hinged to one end of the telescopic shaft (18). The limiting pin (20) is inserted into the inner wall of the inclined guide rail (12). The end of the limiting pin (20) passes through the anti-fall module support plate (10) and is hinged to one end of the connecting rod (19). The roller (21) is rotatably connected to the end of the limiting pin (20). The two symmetrically arranged guide wheels (11) are rotatably connected to the lower side of the inner wall of the anti-fall module support plate (10).
3. A fall protection device for cranes according to claim 1, characterized in that: The mechanical triggering module includes a rotating plate (26), a limiting shaft (27), a movable arm (28), a counterweight striking block (29), a connecting block (30), and a second spring (31). The rotating plate (26) is fixedly installed on both ends of the shaft of the fixed pulley (7) at the end of the arm. The limiting shaft (27) is fixed on the outer surface of the rotating plate (26). The middle part of the movable arm (28) is rotatably connected to the outer surface of the limiting shaft (27). The counterweight striking block (29) is fixed on one end of the movable arm (28). The other end of the movable arm (28) is hinged to the connecting block (30). A second spring (31) is installed between the two sets of centrally symmetrical limiting shafts (27), movable arms (28), counterweight striking blocks (29), and connecting blocks (30).
4. A fall protection device for cranes according to claim 1, characterized in that: The electrical sensing trigger module includes a bracket (34), a guide roller (35), a speed sensor (36), an outer convex shaft (37), a support plate (38), a pressure roller (39), a torsion spring (40), and an angle sensor (41). The bracket (34) is fixedly installed on the crane. The guide roller (35) is rotatably connected to the inner side of the bracket (34) via a rotating shaft. The speed sensor (36) is fixed on the outer surface of the bracket (34). The outer convex shaft (37) is fixed at one end of the bracket (34) away from the speed sensor (36). The support plate (38) is rotatably connected to the outer surface of the outer convex shaft (37). The pressure roller (39) is rotatably connected to one end of the support plate (38) via a shaft. The torsion spring (40) is sleeved on the outer side of the outer convex shaft (37). The two ends of the torsion spring (40) are fixed to the inner sidewalls of the outer convex shaft (37) and the support plate (38), respectively. The angle sensor (41) is fixed on the outer surface of the support plate (38).
5. A fall protection device for cranes according to claim 1, characterized in that: The inclined guide rail (12) is inclined, and the outer surface of the anti-fall clamping block (13) is provided with anti-slip teeth (14). There are two inclined guide rails (12) and two anti-fall clamping blocks (13) arranged symmetrically.
6. A fall protection device for cranes according to claim 1, characterized in that: The lower surface of the fall arresting clamp (13) is provided with a limiting groove (22), the outer surface of the roller (21) is engaged with the inside of the limiting groove (22), the outer surface of the fall arresting module support plate (10) is fixedly connected with an outer plate (23), the outer surface of the fall arresting clamp (13) is fixedly connected with a reset rod (24), the outer surface of the outer plate (23) is provided with a slot adapted to the reset rod (24), and the end of the reset rod (24) passes through the slot and is placed on the outside of the outer plate (23).
7. A fall protection device for cranes according to claim 1, characterized in that: The mechanical triggering module is provided in two symmetrical configurations. An arc-shaped impact block (25) is fixedly installed at the end of the telescopic shaft (18) away from the connecting rod (19). The arc-shaped impact block (25) is positioned towards the center of the mechanical triggering module. A protective cover (33) is fixedly connected to the outer surface of the anti-fall module support plate (10) located outside the outer bushing (9).
8. A fall protection device for cranes according to claim 1, characterized in that: The detection end of the speed sensor (36) is fixedly connected to one end of the rotating shaft of the guide roller (35), and the detection end of the angle sensor (41) is fixedly connected to the inner wall of the convex shaft (37).
9. A fall protection device for cranes according to claim 1, characterized in that: The outer surface of the rotating plate (26) is fixedly connected to the limiting plate (32) on the outside of the end of the movable arm (28), and the outer surface of the end of the movable arm (28) abuts against the outer surface of the rotating plate (26).
10. A crane, comprising a crane body (1), a boom (2), a winch device (3), a wire rope (4), and a hook (5), wherein the boom (2) is disposed on the upper side of the crane body (1), the winch device (3) is installed on the upper side of the crane body (1) and is disposed corresponding to one end of the boom (2), one end of the wire rope (4) is wound around the winch device (3), and the hook (5) is fixedly installed on one end of the wire rope (4), characterized in that: The crane also includes the anti-fall safety device for the crane as described in claim 4; the mounting bracket (6) of the anti-fall safety device is fixedly connected to the end of the boom (2), and the bracket (34) of the electric sensing trigger module is fixed on the upper surface of the boom (2); the middle part of the wire rope (4) is placed between the upper side of the guide roller (35) and the lower side of the pressure roller (39), the wire rope (4) is wrapped around the outer surface of the fixed pulley (7) at the end of the boom (2), and the wire rope (4) is located between two guide wheels (11). The control room of the crane body (1) is provided with a master control module. The boom (2) is provided with multiple sections, and each section of the boom (2) is provided with an electric sensing trigger module. Each section of the boom (2) is equipped with a drag chain on its outer surface, and a wire is provided in the drag chain. The double-ended electric telescopic rod (17), the speed sensor (36), and the angle sensor (41) are all electrically connected to the master control module through wires.