Quick unhooking type crane hook device

Abstract

The utility model provides a quick unhooking type crane hook device, which solves the problem that when a conventional crane is about to incline due to overloading, a hook device is difficult to unhook a load in time, so that the crane is overturned. The automatic unhooking device comprises a lifting hook supporting disc and an electric control safety lock, the lifting hook supporting disc is arranged between the lifting hook base plate and the lifting hook positioning nut, at least two sets of evenly-distributed outwards-protruding hanging arms are arranged on the outer circumference of the lifting hook supporting disc, and at least two sets of evenly-distributed supporting protruding blocks with upper supporting inclined faces are arranged on the inner diameter of the lifting hook base plate. The supporting protruding block and the outwards-protruding hanging arm are in lap joint correspondingly in the circumferential direction, and the electric control bolt lock is provided with a wireless signal receiving module used for receiving an unhooking triggering signal of a crane inclination monitoring and alarming system. The unhooking device can trigger the unhooking and timely disengagement by receiving an alarm signal of a crane inclination monitoring alarm system, so that rollover caused by dragging of a hoisted object is avoided, and the safety of a crane is protected.

Description

Technical Field

[0001] The utility model relates to the field of crane equipment, in particular to a quick-release crane hook device, which is suitable for safe hoisting operations of engineering cranes. Background Art

[0002] At present, cranes are commonly used crane equipment in engineering equipment. Whether it is a car crane, a construction site crane, a train crane or a ship crane, it is difficult to avoid operating errors or misjudgment of the weight of the hoisted object or quality reasons during the hoisting construction operation, resulting in excessive load and center of gravity deviation of the crane, and the inability to immediately adjust the center of gravity of the crane or detach from the hoisted object, and eventually a rollover or overturning safety accident occurs, causing great losses of personnel and property. In order to monitor whether the crane equipment will roll over or other abnormal conditions during construction operations, the patent document with announcement number CN111807241A provides a crane hydraulic outrigger anti-rollover alarm system, and its crane tilt monitoring alarm system monitors the state of the crane hydraulic outrigger by setting a pressure transmitter in the control system, and alarms through an alarm when an abnormality occurs. The patent document with announcement number CN107697820A provides a crane anti-rollover system, and its crane tilt monitoring alarm system adopts gravity sensors and pressure sensors set on the crane outriggers, and connects the alarm through the control system for prevention. Conventional crane hook devices include a pulley mechanism provided by a hook support frame and a hook chassis equipped with a hook. The hook is hooked to the central through hole of the hook chassis through a hook positioning nut at the upper end of the hook handle, so that the hook can be firmly set on the hook chassis and cannot be unhooked. Therefore, when the crane tilts while lifting cargo and the crane's anti-rollover system alarm system sends an alarm signal, the hook is still connected to the hoisted cargo, and the crane operator cannot quickly throw away the load, resulting in a rollover accident. Utility Model Content

[0003] The purpose of the utility model is to provide a quick-release crane hook device, which solves the problem that the hook device of a conventional crane is difficult to timely release the load when the crane is overloaded and is about to tilt, resulting in overturning. The utility model can timely receive the early warning alarm signal of the crane tilt alarm, quickly and automatically release the load cargo, prevent the crane from overturning, and protect the safety of the crane.

[0004] The technical solution adopted by the utility model is: a quick-release crane hook device, including a pulley mechanism arranged through a hook support frame and a hook chassis equipped with a hook, the hook is hung on the central through hole of the hook chassis through a hook positioning nut at the upper end of the hook handle, and the technical key points are: the hook support frame is provided with an automatic unhooking device, the automatic unhooking device includes a hook support plate and an electric control safety lock, the hook support plate is arranged between the hook chassis and the hook positioning nut, at least two groups of uniformly distributed outer convex hanging arms are arranged on the outer circumference of the hook support plate, at least two groups of uniformly distributed support protrusions with upper supporting inclined surfaces are arranged on the inner diameter of the hook chassis, the support protrusions are overlapped with the outer convex hanging arms in a corresponding manner along the circumferential direction, and the support protrusions A stop boss is provided at the high position of the inclined surface, and the hook chassis is connected by the gap between the supporting protrusions and the central through hole to form a chassis unhooking hole for the hook support plate to rotate to the corresponding position; the electric control safety lock includes a positioning pin mechanism and an electric control latch lock arranged on the upper end surface of the hook chassis, the positioning pin mechanism is a locking rod with a wedge-shaped pin in the middle, the rotating end of the locking rod is rotatably connected to the hook chassis, the free end of the locking rod is limited by the latch head of the electric control latch lock, the wedge-shaped pin is radially locked and inserted into the locking pin groove on the end surface of the outer convex hanging arm, and an unlocking spring is provided at the free end of the locking rod corresponding to the chassis; the electric control latch lock is provided with a wireless signal receiving module for receiving the trigger unhooking signal of the crane inclination monitoring alarm system.

[0005] The outer protruding hanging arm is a supporting roller arranged through a supporting shaft, and the supporting roller is pressed against an upper supporting inclined surface of the supporting protrusion.

[0006] The outer protruding hanging arm is a tooth-shaped protrusion, and the tooth-shaped protrusion is pressed against the upper supporting inclined surface of the supporting protrusion through the lower end supporting inclined surface.

[0007] The automatic unhooking device is provided with a hook support plate rotating mechanism for pushing the hook support plate to rotate to the corresponding position of the chassis unhooking hole. The hook support plate rotating mechanism is a thrust spring arranged between each group of external convex hanging arms and supporting protrusions to push the hook support plate to rotate toward the chassis unhooking hole.

[0008] The automatic unhooking device is provided with a hook support plate rotating mechanism for pushing the hook support plate to rotate to the corresponding position of the chassis unhooking hole. The hook support plate rotating mechanism is a worm gear transmission mechanism driven by a motor and meshed with the corresponding threads on the outer circumference of the hook support plate to push the hook support plate to rotate toward the chassis unhooking hole.

[0009] The hook chassis is provided with a manual limiting latch for limiting the locking rod of the positioning latch mechanism.

[0010] A torsion spring is connected between the hook support plate and the hook chassis and is used to push the hook support plate to rotate toward the chassis unhooking hole.

[0011] The outer end surface of the outer protruding hanging arm is provided with a hook support plate mounting hole for inserting the push rod.

[0012] The hook chassis is provided with a manual limiting latch for limiting the locking rod of the positioning latch mechanism.

[0013] The automatic unhooking device is provided with a hook support plate rotating mechanism that pushes the hook support plate to rotate to the corresponding position of the chassis unhooking hole, and the hook support plate rotating mechanism includes a hook support plate rotating mechanism provided with an automatic unhooking device that pushes the hook support plate to rotate to the corresponding position of the chassis unhooking hole, and the hook support plate rotating mechanism is a worm gear transmission mechanism driven by a motor and meshed with corresponding threads on the outer circumference of the hook support plate for pushing the hook support plate to rotate toward the chassis unhooking hole; a thrust spring circumferentially pushing the hook support plate to rotate toward the chassis unhooking hole between each group of external convex hanging arms and supporting protrusions; the hook chassis is provided with a manual limiting pin for the locking rod of the limiting positioning latch mechanism; a torsion spring is connected between the hook support plate and the hook chassis for pushing the hook support plate to rotate toward the chassis unhooking hole; the outer end surface of the external convex hanging arm is provided with a hook support plate mounting hole for inserting a push rod.

[0014] The advantages and positive effects of the utility model are as follows: since the utility model is provided with an automatic unhooking device, the supporting protrusions of the hook chassis and the outer protruding hanging arm of the hook supporting plate are overlapped in a circumferentially inclined manner, and the hook chassis is connected by the gaps between the supporting protrusions and the central through hole to form a chassis unhooking hole for the hook supporting plate to rotate to the corresponding position, so that the hook chassis can support the hook supporting plate, and when the hook supporting plate rotates to the position of the chassis unhooking hole by gravity, the hook falls and detaches from the hook chassis; an electric-controlled safety lock including a positioning bayonet mechanism and an electric-controlled latch lock is provided, and the wedge-shaped bayonet of the positioning bayonet mechanism is locked and inserted into the lock pin groove of the outer end face of the outer protruding hanging arm, the free end of the lock rod is limited by the latch head of the electric-controlled latch lock, and the free end of the corresponding lock rod of the chassis is provided with an unlocking spring. The hook chassis locking limit is at the supporting position of the hook chassis, and the wireless signal receiving module that receives the trigger unhooking signal of the crane inclination monitoring and alarm system controls the electric control latch lock, so that the wedge-shaped latch is disengaged from the locking pin groove, and the hook support plate is disengaged from the control of the electric control safety lock, and the chassis unhooking hole is automatically rotated to complete the unhooking by gravity. Therefore, it can trigger the unhooking and disengage in time by receiving the alarm signal of the crane inclination monitoring and alarm system, so as to avoid rollover caused by the dragging of the suspended object, resulting in loss of personnel and crane overturning. After the suspended object is separated from the crane, not only can the crane accident be saved, but also the crane arm caused by the suspended object and the surrounding environment due to the overturning of the crane can be avoided, and the casualties of the crane driver can be avoided at the same time. It can be said that it kills two birds with one stone, thereby achieving the purpose of sacrificing pawns to save the car and protecting the safety of the crane. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the structure of the hook device in the exploded state of the embodiment of the utility model;

[0017] Figure 2 It is a schematic diagram of the longitudinal cross-sectional structure of the hook of an embodiment of the utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the hook support plate of an embodiment of the utility model;

[0019] Figure 4 yes Figure 3 Schematic diagram of the structure viewed from above;

[0020] Figure 5 yes Figure 3 AA section structural diagram;

[0021] Figure 6 This is a schematic diagram of the top view of the structure of the hook device in the supporting state of the embodiment of the utility model;

[0022] Figure 7 This is a schematic diagram of the top view of the structure of the hook device of the utility model in the unhooked state;

[0023] Figure 8 It is a structural schematic diagram of another embodiment of the utility model in a supporting state;

[0024] Fig. 9 yes Figure 8 Schematic diagram of the structure in the decoupled state.

[0025] Fig.10 This is a schematic diagram of the structure of the hook device in the exploded state of the third embodiment of the utility model;

[0026] Fig.11 This is a schematic diagram of the structure of the hook support plate of the third embodiment of the utility model;

[0027] Fig.12 yes Fig.10 A longitudinal cross-sectional view of a hook support plate and a hook chassis in a crimped state;

[0028] Fig.13 It is a schematic diagram of the top view of the structure of the hook device in the supporting state of the third embodiment of the utility model;

[0029] Fig.14 It is a schematic diagram of the top view of the structure of the hook device of the third embodiment of the utility model in the unhooked state.

[0030] Explanation of serial numbers in the figure: 12 hook support frame, 13 pulley mechanism, 14 protective cover, 15 positioning nut, 16 torsion spring, 17 hook support plate, 18 hook chassis, 19 chassis unhooking hole, 20 hook, 21 locking rod, 22 wedge-shaped latch, 23 unlocking spring, 24 free end of locking rod, 25 electric control latch lock, 26 manual limit latch, 27 thrust spring, 28 motor, 29 worm, 30 threaded teeth, 31 power supply battery, 171 external protruding hanging arm, 172 lock pin groove, 173 mounting hole, 174 lower supporting inclined surface, 181 supporting protrusion, 182 stop boss, 183 upper supporting inclined surface, 251 latch head. DETAILED DESCRIPTION

[0031] according to Figures 1 to 14 Describe the specific structure of the utility model in detail, implement it, for example Figure 1 and Figure 2 As shown, a quick-release crane hook device is suitable for installation on a crane equipped with a crane tilt monitoring and alarm system. The quick-release crane hook device includes a pulley mechanism 13 arranged through a hook support frame 12, a hook chassis 18 equipped with a hook 20, and an automatic unhooking device. The hook chassis 18 is fixed to the lower part of the hook support frame 12 by bolts, and the hook chassis is provided with a central through hole. The upper end of the hook handle of the hook 20 is provided with a hook positioning nut 15 for hanging, and a protective cover 14 can also be provided outside the hook positioning nut to protect the automatic unhooking device.

[0032] The automatic unhooking device includes a hook support plate 17, an electric control safety lock, and a hook chassis that cooperates with the hook support plate to form a chassis unhooking hole 19. Figure 2 As shown, the inner wall of the central through hole of the hook chassis 18 is provided with a support protrusion 181 with an upper support inclined surface 183, and a gap is left between adjacent support protrusions. The hook chassis is connected by the gap between the support protrusions and the central through hole to form a chassis unhooking hole 19, and a stop boss 182 is provided at the upper support inclined surface of the support protrusion 181. Figures 2 to 5 As shown, the hook support plate 17 is arranged between the hook base plate 18 and the hook positioning nut 15, and an outer convex hanging arm 171 is arranged on the outer circumference of the hook support plate 17. The outer convex hanging arm of this embodiment is a tooth-shaped protrusion, and the tooth-shaped protrusion has a lower supporting inclined surface 174, and the upper supporting inclined surface 183 of the supporting protrusion is pressed by the lower end supporting inclined surface. Figure 6 and Figure 7As shown, the outer diameter of the hook support plate body is smaller than the inner diameter of the circumference of the support protrusion of the hook chassis, the support protrusion and the outer convex hanging arm overlap in the circumferential direction, the chassis unhooking hole of the hook chassis is provided for the hook support plate to rotate to the corresponding position and pass through, and the outer convex hanging arm of the hook support plate falls down and passes through the chassis unhooking hole 19 position to which the support inclined surface rotates at the low position under the action of gravity in the circumferential direction. A mounting hole 173 can be provided on the outer end surface of the outer convex hanging arm 171, and when the hook support plate is installed to the initial position, the mounting hole is inserted through the mounting push rod, and the mounting push rod is used to conveniently push the hook support plate to rotate to the position supported by the hook chassis and locked, and then the mounting push rod is pulled out.

[0033] like Figure 6 and Figure 7 As shown, the electric-controlled safety lock includes a positioning pin mechanism and an electric-controlled latch lock 25 arranged on the upper end surface of the hook chassis 18. The positioning pin mechanism is an arc-shaped locking rod 21 that is arranged to rotate along the arc surface of the hook chassis. The inner side of the middle part of the locking rod is provided with a wedge-shaped pin 22. The rotating end of the locking rod 21 is connected to the hook chassis 18 through a rotating shaft. The free end 24 of the locking rod is limited by the latch head 251 of the electric-controlled latch lock 25. The wedge-shaped latch 22 is radially locked and inserted into the locking pin groove 172 on the outer end surface of the outer convex hanging arm. The hook chassis 18 is provided with an unlocking spring 23 at the free end 24 of the locking rod corresponding to the locking rod. The root of the unlocking spring is fixed to the outer circumferential end surface of the corresponding supporting protrusion stop boss. The front end of the unlocking spring 23 is vertically abutted against the free end 24 of the locking rod, and is limited by the latch head of the electric-controlled latch lock 25 to prevent the free end of the locking rod from being bounced outward by the unlocking spring. The electric-controlled latch lock is connected with a wireless signal receiving module and a power supply battery 31. The wireless signal receiving module can adopt a commercially available electric-controlled latch lock with a wireless signal receiving module, and the locking rod of the positioning latch mechanism is locked by controlling the telescopic locking of the latch head of the electric-controlled latch lock. The wireless signal receiving module is used to receive the alarm signal of the crane tilt monitoring alarm system as a trigger unhooking signal. The wireless signal receiving module can adopt a wireless remote control, sound wave or Bluetooth wireless signal connection control method that matches the crane tilt monitoring alarm system.

[0034] As a further improvement, at least three groups of supporting protrusions and external protruding hanging arms can be arranged in pairs and evenly arranged along the circumferential direction, such as Figures 3 to 8 As shown, the support protrusions 171 and the outer convex hanging arms 181 are arranged in four groups, and the automatic unhooking device is provided with a hook support plate rotating mechanism that pushes the hook support plate 17 to rotate to the corresponding position of the chassis unhooking hole 19. The hook support plate rotating mechanism is a thrust spring 27 arranged between each group of outer convex hanging arms 171 and support protrusions 181 to push the hook support plate to rotate toward the chassis unhooking hole. Figure 8 As shown, when the hook chassis and the hook support plate are in the initial supporting state, the thrust spring 27 is in a compressed state. Since the electric control safety lock is in a locked state, the thrust spring cannot be ejected; Fig. 9As shown, when the electric control safety lock changes to the unlocked state, the thrust spring 27 releases the thrust, quickly pushing the hook support plate 17 to the unhooking hole position of the chassis, so that the hook support plate and the hook fall and unhook. The hook support plate rotation mechanism can instantly generate thrust when the electric control safety lock changes to the unlocked state to prevent the friction between the outer convex hanging arm and the support protrusion from being too large to prevent the hook support plate from rotating, thereby avoiding unhooking failure.

[0035] As a further improvement, the supporting protrusions and the outer protruding hanging arms are arranged in pairs of two or three groups, and are evenly arranged along the circumferential direction, such as Fig.10 and Fig.11 As shown, the support protrusion 181 and the outer protruding hanging arm 171 are set as two groups, and the automatic unhooking device is provided with a hook support plate rotating mechanism that pushes the hook support plate 17 to rotate to the corresponding position of the chassis unhooking hole 19. The hook support plate rotating mechanism is a worm gear transmission mechanism driven by a motor 28, which adopts: the motor 25 is set at a position of the hook chassis 18 away from the support protrusion, the motor drive shaft is connected to the worm 29, the outer circumference of the hook support plate is provided with thread teeth 30 corresponding to the worm 29, and the worm connected to the motor drive shaft is in thread engagement with the outer circumference of the hook support plate. The motor can use a commercially available wireless control motor with a wireless signal receiving module, and the wireless signal receiving module is used to receive the trigger unhooking signal of the crane tilt monitoring alarm system to activate the motor. When the hook chassis and the hook support plate are in the initial support state, the worm 29 and the threaded teeth 30 are in meshing state, and when the electric control safety lock receives the trigger unhooking signal of the crane tilt monitoring alarm system through the wireless signal receiving module, it changes to the unlocking state, and at the same time, the motor also receives the trigger unhooking signal, and the motor drives the worm to rotate, and quickly pushes the hook support to the unhooking hole position of the chassis, so that the hook support plate and the hook fall and unhook. The hook support plate rotation mechanism can instantly generate thrust when the electric control safety lock changes to the unlocking state, preventing the friction between the outer convex hanging arm and the support convex block from being too large to prevent the hook support plate from rotating, and avoiding unhooking failure.

[0036] As a further improvement, Figure 8 and Fig. 9 As shown, a manual limit pin 26 is provided on the hook chassis. The manual limit pin is inserted into the manual limit socket of the locking rod 21, which can increase the safety of the automatic unhooking device. Before the crane starts lifting, the manual limit pin is pulled out.

[0037] As a further improvement, Figure 3 and Figure 4As shown, a torsion spring 16 for pushing the hook support plate to rotate toward the chassis unhooking hole can be connected between the hook support plate 17 and the hook chassis 18. One end of the torsion spring is fixed to the mounting hole of the hook support plate 17, and the other end of the torsion spring is fixed to the mounting hole of the hook chassis 18, which can instantly generate thrust when the electric control safety lock changes to the unlocking state, and assist in pushing the hook support plate to rotate toward the chassis unhooking hole position.

[0038] like Figures 10 to 14 As shown, it is a quick-release crane hook device using another hook support plate 18, the outer convex hanging arm 171 of the hook support plate is a support roller arranged through a support shaft, and the support roller presses the upper support inclined surface of the support protrusion 181. It can form rolling friction between the outer convex hanging arm 171 and the support protrusion 181, greatly reducing the friction force, and it is not necessary to set the thrust spring 27. The lock pin groove 172 and the mounting hole 173 are respectively arranged at the outer end of the support shaft corresponding to the outer convex hanging arm, and the other structures are the same as the above-mentioned embodiment.

[0039] Working process and principle: The quick-release crane hook device of the utility model is suitable for use on a crane installed with a crane tilt monitoring and alarm system, wherein the support protrusions of the hook chassis of the automatic unhooking device and the outer protruding hanging arm of the hook support plate are overlapped in a circumferential inclined manner, and the hook chassis is connected by the gaps between the support protrusions and the central through hole to form a chassis unhooking hole for the hook support plate to rotate to the corresponding position, so that the hook chassis can support the hook support plate, and when the hook support plate rotates to the position of the chassis unhooking hole by gravity, the hook falls and detaches from the hook chassis; the arrangement includes The electric safety lock of the positioning pin mechanism and the electric latch lock utilizes the wedge-shaped pin of the positioning pin mechanism to lock and insert into the lock pin groove on the outer end face of the outer convex hanging arm, and the free end of the lock rod is limited by the latch head of the electric latch lock, and the free end of the corresponding lock rod of the chassis is provided with an unlocking spring, which can limit the lock of the hook chassis to the supporting position of the hook chassis, and control the electric latch lock through a wireless signal receiving module that receives the trigger unhooking signal of the crane inclination monitoring alarm system, so that the wedge-shaped pin is disengaged from the lock pin groove, and the hook support plate is disengaged from the control of the electric safety lock, and the unhooking is completed by automatically rotating to the unhooking hole of the chassis due to gravity.

[0040] When using the quick-release hook device, first pull out the manual limit pin of the positioning latch mechanism, connect the power supply of the electric control safety lock, the wireless communication receiving module of the automatic unhooking device receives the unhooking signal to control the action of the electric control pin lock, the electric control pin lock disengages from the limit hook support plate, the hook chassis rotates to the unhooking hole position of the chassis, drives the hook to disengage from the hook device together, the crane loses the lifting load cargo, restores the center of gravity, and maintains stability. Therefore, it can be detached from the hook in time to avoid the loss of personnel and crane overturning caused by the dragging of the suspended object. After the suspended object is separated from the crane, not only can the crane accident be saved, but also the crane arm caused by the suspended object and the surrounding environment due to the overturning of the crane can be avoided. At the same time, the casualties of the crane driver can be avoided. It can be said that it kills two birds with one stone, thereby achieving the purpose of sacrificing the pawn to save the car, and the load can be automatically unhooked in time to protect the safety of the crane.

[0041] In summary, the purpose of the utility model is achieved.

Claims

1. A quick-release crane hook device, comprising a pulley mechanism arranged through a hook support frame and a hook chassis equipped with a hook, wherein the hook is hung on a central through hole of the hook chassis through a hook positioning nut at the upper end of a hook handle, and characterized in that: The hook support frame is provided with an automatic unhooking device, which includes a hook support plate and an electric-controlled safety lock. The hook support plate is arranged between the hook chassis and the hook positioning nut. At least two groups of evenly distributed outer convex hanging arms are arranged on the outer circumference of the hook support plate. The outer convex hanging arms and the inner diameter of the hook chassis are provided with at least two groups of evenly distributed support protrusions with upper supporting inclined surfaces. The support protrusions and the outer convex hanging arms are overlapped correspondingly along the circumferential direction. A stop boss is arranged at a high position on the inclined surface of the support protrusion. The hook chassis is connected by the gap between the support protrusions and the central through hole to form a space for the hook support plate. Rotate to the corresponding position through the chassis unhooking hole; the electric control safety lock includes a positioning pin mechanism and an electric control latch lock arranged on the upper end surface of the hook chassis, the positioning pin mechanism is a locking rod with a wedge-shaped pin in the middle, the rotating end of the locking rod is rotatably connected to the hook chassis, the free end of the locking rod is limited by the latch head of the electric control latch lock, the wedge-shaped pin is radially locked and inserted into the locking pin groove on the end surface of the outer convex hanging arm, and the free end of the locking rod corresponding to the chassis is provided with an unlocking spring; the electric control latch lock is provided with a wireless signal receiving module for receiving the trigger unhooking signal of the crane tilt monitoring alarm system.

2. The quick release crane hook device according to claim 1, characterized in that: The outer protruding hanging arm is a supporting roller arranged through a supporting shaft, and the supporting roller is pressed against an upper supporting inclined surface of the supporting protrusion.

3. The quick release crane hook device according to claim 1, characterized in that: The outer protruding hanging arm is a tooth-shaped protrusion, and the tooth-shaped protrusion is pressed against the upper supporting inclined surface of the supporting protrusion through the lower end supporting inclined surface.

4. The quick release crane hook device according to any one of claims 1 to 3, characterized in that: The automatic unhooking device of the supporting protruding hanging arm is provided with a hook support plate rotating mechanism for pushing the hook support plate to rotate to the corresponding position of the chassis unhooking hole. The hook support plate rotating mechanism is a thrust spring arranged circumferentially between each group of external convex hanging arms, the external convex hanging arms and the supporting protrusions, which pushes the hook support plate to rotate toward the chassis unhooking hole.

5. The quick release crane hook device according to any one of claims 1 to 3, characterized in that: The hook chassis is provided with a manual limiting latch for limiting the locking rod of the positioning latch mechanism.

6. The quick release crane hook device according to any one of claims 1 to 3, characterized in that: A torsion spring is connected between the hook support plate and the hook chassis and is used to push the hook support plate to rotate toward the chassis unhooking hole.

7. The quick release crane hook device according to any one of claims 1 to 3, characterized in that: The outer end surface of the outer convex hanging arm is provided with a hook support plate mounting hole for inserting the push rod.

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