CN217323198U - Free hook-falling hoisting mechanism and crane - Google Patents

Abstract

The utility model relates to a free hook falling hoisting mechanism and a crane, wherein the free hook falling hoisting mechanism comprises a coupling shaft; the winding drum is sleeved on the connecting shaft and synchronously rotates with the connecting shaft; a brake installed in an axial direction of the coupling shaft, the brake being disposed coaxially with the coupling shaft, the brake including: the stator is fixedly installed; a rotor rotating about a central axis of the coupling shaft; a coil disposed on the stator. The application provides a free hook hoist mechanism and hoist, non-contact takes heavy load braking when can realize the hoist free hook that falls.

Description

Free hook-falling hoisting mechanism and crane

Technical Field

The utility model belongs to the technical field of the hook that freely falls, in particular to a free hook hoist mechanism and hoist that fall.

Background

At present, a hoisting mechanism on a crane is driven by a motor in a hoisting state and a hook falling state, the hoisting hook is required to fall from the high altitude in the actual work of the crane, after the heavy object is hung on the hoisting hook, the motor rotates reversely and lifts, the lowering process of the hoisting hook is slow, time-consuming and low in efficiency, the process is driven by the motor all the time, fuel is wasted, the falling and the hoisting are frequent, the hoisting machine rotates normally and reversely frequently, the motor is easy to damage, and therefore the free hook falling type hoisting machine appears on the market.

The free falling hook type winch enables the hung heavy object to do free falling body movement, realizes that the winch only depends on the self gravity of the heavy object to drive the winch to rotate freely under the action of no driving force, therefore, the winch needs to be braked in the free lowering process with a load (hereinafter referred to as load), the braking mode is particularly difficult, at the moment, the load of a heavy object on the winch moves downwards in a free falling body with high speed, the required braking force is far higher than the gravity of the hoisted heavy object, the free hook falling winch mechanism in the prior art can only run in no-load or small load, and the safety of the free hook falling braking can be ensured, however, the hoisting machine with the small load can limit the hoisting and bearing of the crane, and on the other hand, the hoisting machine adopts contact braking, the contact braking is braking by generating friction resistance, and a friction acting element is abraded for a long time, so that the generated braking force is inaccurate.

SUMMERY OF THE UTILITY MODEL

The technical problem is solved, an object of the utility model is to provide a free hook hoist mechanism and hoist that falls, non-contact area heavy load braking when can realizing the hoist free hook that falls.

The technical scheme of the utility model as follows:

a free-fall hook hoist mechanism comprising: a coupling shaft;

the winding drum is sleeved on the connecting shaft and synchronously rotates with the connecting shaft;

a brake located in an axial direction of the coupling shaft, the brake being disposed coaxially with the coupling shaft, the brake including: the stator is fixedly installed; the rotor is coaxially driven with the coupling shaft; and the coil is arranged on the stator.

Preferably, the brake includes a housing through which the coupling shaft passes, the stator, the rotor, and the coil being disposed in the housing.

Preferably, the brake includes a cooling channel disposed adjacent to the coupling shaft for conveying a circulating cooling fluid to cool the stator, the rotor, and the coil.

Preferably, a cooling channel is arranged inside the shell, and the cooling channel is used for conveying a cooling liquid which flows circularly to cool the stator, the rotor and the coil;

the cooling channel is respectively communicated with the liquid inlet pipe and the liquid outlet pipe.

Preferably, the stator is fixedly connected with the inner side of the shell.

Preferably, the free-fall hook winding mechanism includes:

the connecting shaft penetrates through the frame, and the winding drum is arranged on the inner side of the frame;

the output end of the speed reducer is connected with the rack;

a clutch mounted to an end of the coupling shaft.

Preferably, the brake is connected to the frame and mounted between the inside of the frame and the end of the drum, and the rotor is rotatable with the coupling shaft and/or the drum.

Preferably, the brake is arranged at the outer side end of the frame and is arranged with the clutch, and the rotor can rotate along with the coupling shaft and/or the winding drum.

Preferably, the free-fall hook winding mechanism includes:

the bearing is sleeved on the connecting shaft, and the connecting shaft is rotatably connected with the rack through the bearing;

the motor is connected with the speed reducer.

A crane comprises the free-falling hook hoisting mechanism.

The utility model provides a free hook-falling hoisting mechanism, including the coupling shaft, and the cover is established at the reel on the coupling shaft, the system has wire rope around on the reel, when wire rope hangs heavy load and freely transfers, the reel rotates under heavy load pulling wire rope's effect, at this moment when needing the braking, coil circular telegram in the stopper, the rotor is in the in-process around the coupling shaft pivoted, induced-current, this kind of induced-current makes self-forming closed loop in the coupling shaft inside, and then produce magnetic field, according to lenz's law, the magnetic field that produces at coupling shaft and/or rotor and the produced magnetic field interact of stator coil, prevent, counter-resist the rotation of rotor and coupling shaft, formed the braking moment that forces the coupling shaft pivoted, the size of braking moment is adjusted to the excitation current size that the coil was carried to the accessible adjustment, when the hoist machine was in heavy load free hook-falling like this, the purpose of braking when the winch is provided with a heavy-load free hook falling can be achieved only by correspondingly adjusting the exciting current, and on the other hand, the stator and the rotor are not in contact in the whole process, so that the generated braking force is accurate and the braking process state and result are more controllable compared with the contact type free hook falling braking in the traditional technology.

The utility model provides a crane, including foretell free hook hoist mechanism that falls, can reach above-mentioned technological effect equally.

Drawings

The accompanying drawings, which are included to provide an understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention, but do not constitute a limitation of the invention. In the drawings:

fig. 1 is a schematic structural view of a free hook-falling hoisting mechanism provided by the present invention;

fig. 2 is a schematic structural diagram of a brake provided by the present invention;

fig. 3 is another schematic structural diagram of the brake provided by the present invention;

fig. 4 is another schematic structural diagram of the free hook-falling hoisting mechanism provided by the present invention.

Description of the reference numerals

1. A coupling shaft; 2. a winding drum; 3. a brake; 31. a stator; 32. a rotor; 33. a coil; 34. a housing; 341. a liquid inlet pipe; 342. a liquid outlet pipe; 4. a frame; 5. a speed reducer; 6. a clutch; 7. a motor; 8. a steel cord.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present invention, it is to be understood that the terms "upper", "lower", and the like, indicate orientations or positional relationships, and are used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the components or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

In the winch in the prior art, if the free hook falling is required, the hoisted load is placed on the ground to realize the free hook falling, or the hoisting load is limited, so that the hoisting load is reduced as much as possible. For the on-load brake when the winch is freely hooked, there are three service brake mechanisms on the market, for example: the belt type brake and the caliper disc type brake are dry type brakes, and the friction plates are arranged to enable the friction plates and a braked object to slide, once a hoisting load of the winch is overlarge, a large amount of heat can be instantly accumulated between the friction surfaces, so that the friction surfaces generate thermal deformation and are overheated and damaged, therefore, the belt type brake and the caliper disc type brake are only used for no-load hook falling or light-load hook falling, the friction plates of the two brake mechanisms generate friction wear, and after the service life is long, the two brake mechanisms cannot brake when the heavy-load hoisting winch is freely hooked, the generated brake moment deviation is large, the brake is unreliable and the like. Another wet-type multi-friction-plate braking mechanism in the prior art generates friction braking by extruding a multi-friction plate and a rotating disc, wherein the friction plate and the rotating disc are arranged in a closed cavity filled with flowing cooling liquid, the wet-type multi-friction-plate braking generates braking torque by sliding friction braking in principle, and a large amount of heat is generated on a friction surface, and the wet-type multi-friction-plate braking mechanism is different from band-type braking and caliper disc braking: the multi-friction-plate simultaneous braking is realized, the contact area is large, the braking torque is large, the friction heat is taken away through flowing cooling liquid, the protection friction plate is damaged due to overheating, however, the manufacturing precision of the wet-type multi-friction-plate braking mechanism is high, the requirement on the performance of the friction plate material is high, the friction plate needs to be replaced at regular intervals, the maintenance cost is extremely high, on the other hand, solid particles generated after the friction plate is abraded inevitably in the contact braking process are brought away by the cooling liquid, the cooling liquid can pollute the cooling liquid when the cooling liquid is recycled, and the fault of a winch or even a crane can be caused. Therefore, the winch with the free hook falling in the prior art is braked in a contact mode, the maximum hoisting load of the winch is limited, a quick-wear part can be generated, braking force can be inaccurate after the friction braking part is abraded, and potential safety hazards are left for the winch with the heavy-load free hook falling.

The core of the utility model lies in that, realize providing a take heavy load free hook hoist mechanism that falls through non-contact braking, this kind of hoist mechanism's braking torque can adjust according to operating condition, and braking torque accuracy receives live time and/or braking environmental impact little, and brake state is stable.

As shown in fig. 1 to 4, the present invention provides a free hook-falling hoisting mechanism, which comprises a coupling shaft 1; the winding drum 2 is sleeved on the connecting shaft 1 and rotates synchronously with the connecting shaft 1; stopper 3, install in the axial direction of coupling shaft 1, stopper 3 and the coaxial setting of coupling shaft 1, stopper 3 includes: the stator 31, the stator 31 is fixedly installed; a rotor 32, the rotor 32 rotating around the central axis of the coupling shaft 1; the coil 33, the coil 33 is provided on the stator 31. The utility model provides a free hook-falling hoisting mechanism, including the coupling shaft 1, and the reel 2 that the cover was established on the coupling shaft 1, the system has wire rope 8 on the reel 2, when wire rope 8 hangs the heavy load and freely transfers, reel 2 rotates under the effect of heavy load pulling wire rope 8, when at this moment when needing to brake, to coil 33 circular telegram in the stopper 3, rotor 32 is in the process of around the rotation of coupling shaft 1, produce induced-current, this induced-current makes the self-formation closed circuit in the coupling shaft 1 inside, then produce magnetic field, according to lenz's law, magnetic field produced at coupling shaft 1 and/or rotor 32 and the magnetic field that stator 31 coil 33 produced interact, prevent, counter rotor 32 and the rotation of coupling shaft 1, formed the braking moment that forces the coupling shaft 1 to rotate, the size of braking moment can be adjusted to the excitation current size that coil 33 carried, therefore, when the winch is in free hook falling under heavy load, the purpose of braking when the winch is in free hook falling under heavy load can be achieved only by correspondingly adjusting the exciting current, on the other hand, in the whole process, the stator 31 and the rotor 32 are not in contact, compared with the contact type free hook falling braking in the traditional technology, the generated braking force is accurate, and the braking process state and the braking result are more controllable.

In this case, the coil 33 is disposed on the stator 31, and it should be understood that the winding of the coil 33 is not particularly limited, and any winding structure of the coil 33 that provides the exciting current to the coil 33 and then generates a new magnetic field should be understood as falling within the protection scope of the present invention, for example, the coils 33 are sequentially distributed in the circumferential direction of the stator 31 and have opposite polarities.

The utility model provides an in the embodiment, stopper 3 includes casing 34, and coupling shaft 1 runs through casing 34, and stator 31, rotor 32 and coil 33 all arrange in casing 34. The housing 34 is provided to prevent external uncertainties from affecting the use of the stator 31, the rotor 32, and the coils 33 inside the housing 34, such as water, foreign materials, and the like.

As shown in fig. 1 and 2, in the embodiment provided by the present invention, the brake 3 includes a cooling channel disposed near the coupling shaft 1, and the cooling channel is used for conveying a circulating cooling fluid to cool the stator 31, the rotor 32, and the coil 33. In the process of braking when the hook is freely dropped by the winding mechanism, the kinetic energy of the rotation of the coupling shaft 1 is converted into heat energy through a magnetic field to be consumed, and then the non-contact deceleration effect is achieved, so that the generated braking torque is more stable. In order to reduce the heat energy generated by the hoisting mechanism during braking, a cooling channel is provided inside the brake 3, and the cooling channel is disposed near the coupling shaft 1, for example, between the rotor 32, the stator 31 and the coil 33, which is not limited specifically and can be specifically set according to the winding of the coupling shaft 1, the stator 31, the rotor 32 and the coil 33. The rotor 32, the stator 31, and the coils 33 are cooled by continuously supplying the cooling liquid into the cooling passage. The cooling channel can be connected with an external cooling system, the external cooling system can be an engine cooling system on the crane, the flowing cooling liquid conveyed into the cooling channel is engine cooling liquid, or the external cooling system can be a hydraulic cooling system on the crane, and the flowing cooling liquid conveyed into the cooling channel is hydraulic oil or other cooling systems which are independently arranged.

The utility model provides a another embodiment, to the structure that is provided with casing 34 on the stopper 3, this kind of structure has the protective properties's of preferred basis, can also cool down the cooling to the part of stopper 3 or whole working part, these working part mainly indicate stator 31, rotor 32 and coil 33, do not specifically prescribe a limit, can specifically set for according to the coiling of coupling shaft 1, stator 31, rotor 32 and coil 33, cooling channel arranges the three outside in or inboard, or arbitrary clearance between the two again, perhaps set up inside arbitrary again. Specifically, a cooling channel is arranged inside the housing 34, and the cooling channel is used for conveying a cooling liquid which flows circularly to cool the stator 31, the rotor 32 and the coil 33; the shell 34 is provided with a liquid inlet tube 341 and a liquid outlet tube, and the cooling channel is respectively communicated with the liquid inlet tube 341 and the liquid outlet tube 342. The liquid inlet tube 341 and the engine heat dissipation cooling system on the crane or the hydraulic cooling system on the crane can be returned to the engine heat dissipation cooling system on the crane or the hydraulic cooling system on the crane through the liquid outlet tube 342 after cooling the stator 31, the rotor 32 and the coil 33. Therefore, the engine heat dissipation cooling system or the hydraulic cooling system on the crane is fully utilized without adding an additional cooling system, so that the design of the whole hoisting mechanism or the crane is more simplified. On the other hand, the utility model provides a free hook hoist mechanism that falls adopts is the non-contact braking, can not produce the wearing and tearing solid particle in braking process, can prevent the pollution to cooling liquid, then can be under the condition that does not influence the original engine heat dissipation cooling system of hoist or hydraulic cooling system use, still compromise the cooling to stopper 3.

For example, the stator 31 and the housing 34 may be integrally formed, or the stator 31 and the housing 34 may be fixedly connected by welding, or the stator 31 and the housing 34 may be detachably and fixedly connected by a connector such as a screw or a bolt, where the fixed connection may be understood as that the stator 31 and the housing 34 do not displace when the free hook-falling hoisting mechanism performs free hook-falling braking with a large load, so that the magnetic field generated by the coupling shaft 1 and/or the rotor 32 is stable, and the braking capability of the brake 3 is stable.

The utility model provides an in the embodiment, free hook hoist mechanism that falls includes: the connecting shaft 1 penetrates through the frame 4, and the winding drum 2 is arranged on the inner side of the frame 4; the output end of the speed reducer 5 is connected with the rack 4; and a clutch 6, wherein the clutch 6 is arranged at the end part of the coupling shaft 1. The frame 4 may be provided with two supporting members, the coupling shaft 1 sequentially passes through the supporting members, a space for accommodating the winding drum 2 and a part of the coupling shaft 1 is formed between the two supporting members, and the output end of the speed reducer 5 is fixedly connected with any one of the supporting members, for example, may be fixedly connected by bolts.

The utility model provides a free hook hoist mechanism's stopper 3 is mainly when braking through the free hook that falls of hoisting mechanism area heavy load, to coil 33 circular telegram, rotor 32 is at the in-process around coupling shaft 1 pivoted, induced-current production, this kind of induced-current makes at coupling shaft 1 inside from forming closed return circuit, produce magnetic field then, according to lenz's law, the magnetic field interact that produces at coupling shaft 1 and/or rotor 32 and stator 31 coil 33, prevent, the rotation of anti rotor 32 and coupling shaft 1, the braking moment that forces coupling shaft 1 pivoted has been formed. Meanwhile, the rotational kinetic energy of the coupling shaft 1 is converted into heat energy through a newly generated magnetic field and consumed, and then the non-contact deceleration function is achieved, so that the installation position of the brake 3 determines the conversion of the rotational kinetic energy of the coupling shaft 1, the brake 3 only needs to be installed in the axial direction of the coupling shaft 1, and various embodiments exist in specific installation positions, and in order to describe the technical mechanism more clearly, the detailed description is given by combining the embodiment of the installation position of the brake 3.

One embodiment is: as shown in fig. 1 and 2, the installation of the brake 3 in the axial direction of the coupling shaft 1 includes: the brake 3 is connected with the frame 4 and is arranged between the inner side of the frame 4 and the end part of the winding drum 2, and the rotor 32 can rotate along with the coupling shaft 1 and/or the winding drum 2. For example, the housing 34 is fixedly installed on the inner wall side of the frame 4, the coupling shaft 1 penetrates through the housing 34, and the coupling shaft 1 drives the rotor 32 to rotate together with the housing 34, the stator 31 and the coil 33, so as to achieve the purpose of cutting the magnetic field.

The second embodiment is as follows: as shown in fig. 3, the rotor 32 is disposed on the end of the winding drum 2, so that the rotor 32 is at least partially disposed inside the housing 34, but the stator 31 and the coil 33 are both disposed inside the housing 34, so that the housing 34 sacrifices a little protection performance to replace the integral arrangement of the rotor 32 and the winding drum 2, so that the rotor 32 can obtain a more stable motion state, and the braking torque output by the brake 3 is more stable.

The third embodiment is: as shown in fig. 4, the brake 3 mounted on the coupling shaft 1 in the axial direction includes: the brake 3 is arranged at the outer end of the frame 4 and is arranged with the clutch 6, and the rotor 32 can rotate along with the coupling shaft 1 and/or the winding drum 2. Install stopper 3 in the frame 4 outside for stopper 3 has wider installation and disassembly space, is convenient for to the maintenance of stopper 3, when stopper 3 damages, also changes easily simultaneously.

The utility model provides an in the embodiment, free hook hoist mechanism that falls includes: the bearing is sleeved on the connecting shaft 1, and the connecting shaft 1 is rotatably connected with the rack 4 through the bearing; the motor 7, the motor 7 is connected with the speed reducer 5. In order to more clearly understand the working principle of the free hook-falling winding mechanism provided by the present application, a detailed description will be given with reference to the preferred embodiments:

when the hoisting mechanism hoists a large load normally, the clutch 6 is closed, the speed reducer 5 and the winding drum 2 are integrated, the parking brake at the input end of the speed reducer 5 starts to work, the motor 7 drives the speed reducer 5 and the winding drum 2 to rotate, and then hoisting and lowering of the hoisted load are realized, at the moment, the coil 33 in the brake 3 is not electrified, and no brake is applied to the connecting shaft 1 and the winding drum 2.

When a hoisting mechanism hoists a large load and freely drops the hook by not unloading the load, the clutch 6 is opened, the speed reducer 5 is separated from the winding drum 2 in power transmission, the winding drum 2 rotates under the action of the steel wire rope 8 wound on the winding drum 2, the winding drum 2 drives the coupling shaft 1 to rotate together, when the hook drops the large load, after the coil 33 of the brake 3 is electrified, the rotor 32 generates induction current in the process of rotating around the coupling shaft 1, the induction current enables a closed loop to be formed in the coupling shaft 1, and then a magnetic field is generated, according to lenz's law, the magnetic field generated by the coupling shaft 1 and/or the rotor 32 and the magnetic field generated by the coil 33 of the stator 31 interact, stop and resist the rotation of the rotor 32 and the coupling shaft 1, so as to form a braking torque for forcing the coupling shaft 1 to rotate, and the size of the braking torque can be adjusted by adjusting the excitation current transmitted to the coil 33, therefore, when the winch is in free hook falling under heavy load, the purpose of braking when the winch is in free hook falling under heavy load can be achieved only by correspondingly adjusting the exciting current.

In the whole braking process, the stator 31 is not in contact with the rotor 32, solid particles cannot be generated, and cooling liquid in an engine heat dissipation cooling system and/or a hydraulic cooling heat dissipation system of the crane enters the liquid inlet pipe 341, flows through the cooling channel, and returns to the engine heat dissipation cooling system and/or the hydraulic cooling heat dissipation system from the liquid outlet pipe 342, so that components (such as any combination of the stator 31, the rotor 32 and the coil 33, or a single component) which generate heat energy in the braking process are cooled, and the generated braking torque is stable and controllable.

The utility model provides a crane, including foretell free hook hoist mechanism that falls. The free hook falling hoisting mechanism provided by the embodiment needs to adjust the magnitude of the braking torque through the magnitude of the exciting current, and particularly when the hoisting mechanism carries a large-load free hook falling brake, the required braking torque is larger, so that the requirement on the exciting current is larger, and in order to realize the free hook falling brake of the larger load, an independent power supply system can be configured according to the requirement. Therefore, the free hook-falling hoisting mechanism provided by the utility model is applied to some known cranes, and a power supply system can be configured according to requirements. Preferably, the utility model provides a hoist is the new forms of energy hoist, the coil 33 of the stopper 3 of the free hook hoist mechanism that will provide with above-mentioned embodiment is connected with the power supply system of new forms of energy hoist, the power supply of the free hook hoist mechanism that falls shares with the work power supply system of new forms of energy hoist, therefore, the free hook hoist mechanism that this application provided, traditional research and development route has been abandoned, for example, the braking of contact free hook falls, and realize non-contact braking through carrying exciting current for coil 33, compare the free hook hoist mechanism that falls among the prior art, be technical mechanism, concrete structure and the research and development route that the technological effect completely differs that can reach, and then can obtain more high-efficient, energy-conservation, the hoist of environmental protection. Please refer to the above embodiments of the free hook-falling hoisting mechanism for other technical effects that can be achieved by the new energy crane, which are not described herein again.

The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts in the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A free-fall hook hoisting mechanism is characterized by comprising: a coupling shaft (1);

the winding drum (2) is sleeved on the connecting shaft (1) and synchronously rotates with the connecting shaft (1);

a brake (3) located in an axial direction of the coupling shaft (1), the brake (3) being disposed coaxially with the coupling shaft (1), the brake (3) comprising: the stator (31), the said stator (31) is fixedly mounted; a rotor (32), wherein the rotor (32) is coaxially driven with the coupling shaft (1); a coil (33), the coil (33) being provided on the stator (31).

2. Free fall hook winding mechanism according to claim 1, characterized in that the brake (3) comprises a housing (34), the coupling shaft (1) extending through the housing (34), the stator (31), the rotor (32) and the coil (33) all being placed inside the housing (34).

3. A free fall hook hoisting mechanism according to claim 1, characterized in that the brake (3) comprises a cooling channel placed close to the coupling shaft (1) for conveying a circulating cooling liquid for cooling the stator (31), the rotor (32) and the coil (33).

4. The free-fall hook hoisting mechanism according to claim 2, wherein the housing (34) is provided with a cooling channel therein for conveying a circulating cooling fluid to cool the stator (31), the rotor (32) and the coil (33);

a liquid inlet pipe (341) and a liquid outlet pipe (342) are arranged on the shell (34), and the cooling channel is respectively communicated with the liquid inlet pipe (341) and the liquid outlet pipe (342).

5. A free fall hook hoisting mechanism as claimed in claim 2, characterized in that the stator (31) is fixedly connected to the inside of the housing (34).

6. The free-fall hook hoist mechanism according to any one of claims 1 to 5,

the free hook-falling hoisting mechanism comprises:

the connecting shaft (1) penetrates through the frame (4), and the winding drum (2) is arranged on the inner side of the frame (4);

the output end of the speed reducer (5) is connected with the rack (4);

the clutch (6), the clutch (6) is installed on the end of the coupling shaft (1).

7. The free fall hook hoist mechanism of claim 6,

the brake (3) is connected with the frame (4) and is arranged between the inner side of the frame (4) and the end part of the winding drum (2), and the rotor (32) can rotate along with the coupling shaft (1) and/or the winding drum (2).

8. The free-fall hook hoist mechanism of claim 6,

the brake (3) is arranged at the outer side end of the rack (4) and is arranged with the clutch (6), and the rotor (32) can rotate along with the coupling shaft (1) and/or the winding drum (2).

9. The free-fall hook hoist mechanism of claim 7, characterized in that the free-fall hook hoist mechanism comprises:

the bearing is sleeved on the connecting shaft (1), and the connecting shaft (1) is rotatably connected with the rack (4) through the bearing;

the motor (7), motor (7) with speed reducer (5) are connected.

10. A crane, characterized in that it comprises a free-fall hook hoisting mechanism according to any one of claims 1 to 9, a power supply system electrically connected to the brake (3).

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