阅读说明：本技术 汽车起重机的车吊分离装置及方法 (Vehicle crane separation device and method of automobile crane ) 是由 陈庆根 于 2021-09-10 设计创作，主要内容包括：本发明涉及机械加工技术领域,且公开了汽车起重机的车吊分离装置,包括设备壳体和安装轴,所述设备壳体内部活动连接有安装轴,所述安装轴外侧活动连接有绕线轴,所述绕线轴外侧活动连接有起吊线缆,所述绕线轴内部开设有活动槽,所述活动槽内壁固定连接有连接弹簧,所述连接弹簧外侧固定连接有动触头,所述活动槽内壁固定连接有定触头,所述设备壳体内部固定连接有磁铁填充块。通过第一磁性块与第一电磁铁之间产生磁性排斥力,使得第一磁性块沿着调节槽向内移动,此时第一磁性块带动第一连杆驱动,第一连杆与第一固定轴形成绕轴驱动机构,将绕线轴沿着逆时针方向转动,收卷起吊线缆,制止重物下坠,防止出现意外事故。(The invention relates to the technical field of machining, and discloses a vehicle-mounted crane separating device of an automobile crane, which comprises an equipment shell and an installation shaft, wherein the interior of the equipment shell is movably connected with the installation shaft, the outer side of the installation shaft is movably connected with a winding shaft, the outer side of the winding shaft is movably connected with a hoisting cable, a movable groove is formed in the winding shaft, the inner wall of the movable groove is fixedly connected with a connecting spring, the outer side of the connecting spring is fixedly connected with a moving contact, the inner wall of the movable groove is fixedly connected with a fixed contact, and a magnet filling block is fixedly connected in the equipment shell. Through producing the magnetism repulsive force between first magnetism piece and the first electro-magnet for first magnetism piece is along the inside removal of adjustment tank, and first magnetism piece drives first connecting rod drive this moment, and first connecting rod forms with first fixed axle and winds the axle and around axle actuating mechanism, rotates the spool along anticlockwise, and the cable is lifted by crane in the rolling, prevents that the heavy object from weighing down, prevents accident.)

1. Automobile crane's car hangs separator, including equipment casing (1), its characterized in that: the device comprises a device shell (1), wherein an installation shaft (2) is movably connected in the device shell (1), a winding shaft (3) is movably connected on the outer side of the installation shaft (2), a hoisting cable (4) is movably connected on the outer side of the winding shaft (3), a movable groove (5) is formed in the winding shaft (3), a connecting spring (6) is fixedly connected on the inner wall of the movable groove (5), a movable contact (7) is fixedly connected on the outer side of the connecting spring (6), a fixed contact (8) is fixedly connected on the inner wall of the movable groove (5), a magnet filling block (9) is fixedly connected in the device shell (1), a first closed conductor (10) is fixedly connected in the winding shaft (3), a first fixing shaft (11) is fixedly connected on the front side of the winding shaft (3), a first connecting rod (12) is movably connected on the outer side of the first fixing shaft (11), an adjusting groove (13) is formed in the device shell (1), a return spring (14) is movably connected in the adjusting groove (13), a first magnetic block (15) is fixedly connected at the inner side of the return spring (14), a first electromagnet (16) is fixedly connected in the equipment shell (1), a first diode (17) is fixedly connected in the equipment shell (1), a second closed conductor (18) is fixedly connected inside the winding shaft (3), a second fixed shaft (19) is fixedly connected on the back surface of the winding shaft (3), a second connecting rod (20) is movably connected at the outer side of the second fixed shaft (19), the inner side of the return spring (14) is fixedly connected with a second magnetic block (21), a second electromagnet (22) is fixedly connected in the equipment shell (1), the device is characterized in that a second diode (23) is fixedly connected inside the device shell (1), and a through hole (24) is formed inside the device shell (1).

2. The hoist separating device of the automobile crane according to claim 1, wherein: the bottom of the first magnetic block (15) is fixedly connected with the top of the first connecting rod (12), and the magnetism of the corresponding surface of the first magnetic block (15) and the first electromagnet (16) is the same.

3. The hoist separating device of the automobile crane according to claim 1, wherein: the bottom of the second magnetic block (21) is fixedly connected with the top of the second connecting rod (20), and the magnetism of the corresponding surface of the second magnetic block (21) and the second electromagnet (22) is the same.

4. The hoist separating device of the automobile crane according to claim 1, wherein: the fixed contact (8) is electrically connected to the first closed conductor (10), the movable contact (7) is connected to a first diode (17) through a wire, and the first diode (17) is connected to a first electromagnet (16) through a wire.

5. The hoist separating device of the automobile crane according to claim 1, wherein: the fixed contact (8) is electrically connected to the second closed conductor (18), the movable contact (7) is connected to a second diode (23) through a wire, and the second diode (23) is connected to a second electromagnet (22) through a wire.

6. The hoist separating device of the automobile crane according to claim 1, wherein: the first closed conductor (10) and the second closed conductor (18) are both located inside the magnetic field environment of the magnet filling block (9).

7. The hoist separating device of the automobile crane according to claim 1, wherein: the first magnetic block (15) and the second magnetic block (21) are movably connected inside the adjusting groove (13), and the first magnetic block (15) and the second magnetic block (21) are located on the same axis of the winding shaft (3).

8. The hoist separating device of the automobile crane according to claim 1, wherein: the back of the mounting shaft (2) is fixedly connected with a driving mechanism, and the outer side of the hoisting cable (4) is movably connected inside the through hole (24).

9. The method for separating the crane of the truck crane according to claim 1, comprising the following steps:

s1, a driving mechanism is fixedly connected to the back of the mounting shaft (2), an operator opens a master control switch, the mounting shaft (2) is driven to rotate through the driving mechanism, so that the winding shaft (3) is driven to rotate, when the winding shaft (3) rotates clockwise, the heavy object is placed by the hoisting cable (4), and when the winding shaft (3) rotates anticlockwise, the heavy object is lifted by the hoisting cable (4);

s2, along with the rotation of the mounting shaft (2), the moving contact (7) is acted by centrifugal force to move outwards along the movable groove (5), when the rotating speed of the mounting shaft (2) is increased due to mechanical failure, the centrifugal force borne by the moving contact (7) is increased, and at the moment, the moving contact (7) and the fixed contact (8) are contacted with each other;

s3, when the speed of the mounting shaft (2) is increased in the clockwise rotation process, the weight rapidly drops, the first closed conductor (10) is located in the magnetic field environment of the magnet filling block (9), the first closed conductor (10) synchronously rotates along with the winding shaft (3), at the moment, the first closed conductor (10) cuts the magnetic induction line to generate current, and the first diode (17) conducts a circuit to enable the first electromagnet (16) to be electrified and have magnetism;

s4, magnetic repulsion force is generated between the first magnetic block (15) and the first electromagnet (16), so that the first magnetic block (15) moves inwards along the adjusting groove (13), at the moment, the first magnetic block (15) drives the first connecting rod (12) to drive, the first connecting rod (12) and the first fixed shaft (11) form a shaft () driving mechanism, the winding shaft (3) rotates along the anticlockwise direction, the hoisting cable (4) is wound, and the weight is prevented from falling;

s5, when the speed of the mounting shaft (2) is increased in the anticlockwise rotating process, the weight is lifted rapidly, the second closed conductor (18) is located in the magnetic field environment of the magnet filling block (9), the second closed conductor (18) rotates synchronously with the winding shaft (3), the second closed conductor (18) cuts the magnetic induction line to generate current, and the second diode (23) conducts a circuit to enable the second electromagnet (22) to be electrified and have magnetism;

s6, a magnetic repulsive force is generated among the second magnetic block (21) and the second electromagnet (22), so that the second magnetic block (21) moves inwards along the adjusting groove (13), at the moment, the second magnetic block (21) drives the second connecting rod (20) to drive, the second connecting rod (20) and the second fixed shaft (19) form a shaft () driving mechanism, the winding shaft (3) rotates along the clockwise direction, the hoisting cable (4) is released, and the heavy object is prevented from being lifted rapidly.

Technical Field

The invention relates to the technical field of machining, in particular to a vehicle-crane separation device and method of an automobile crane.

Background

The automobile crane is a crane arranged on a common automobile chassis or a special automobile chassis, a driving cab of the crane and a crane control cab of the crane are separately arranged, the crane has the advantages of good maneuverability and rapid transfer, and the weight of an object to be lifted by the crane is generally larger, so that the lifting speed of the crane can be limited for production safety, and accidental injury can be caused if the crane runs at a speed exceeding the speed, but the rotating speed of a motor can be changed by factors such as frequency, voltage and the like.

Therefore, the device and the method for separating the vehicle crane from the crane are needed, the first magnetic block moves inwards along the adjusting groove by generating the magnetic repulsive force between the first magnetic block and the first electromagnet, the first magnetic block drives the first connecting rod to drive at the moment, the first connecting rod and the first fixed shaft form a shaft driving mechanism, the winding shaft rotates along the anticlockwise direction, the hoisting cable is wound, the heavy object is prevented from falling, and accidents are prevented.

Through producing the magnetism repulsive force between second magnetism piece and the second electro-magnet for the second magnetism piece is along the inside removal of adjustment tank, and the second magnetism piece drives the drive of second connecting rod this moment, and the second connecting rod forms around axle actuating mechanism with the fixed axle of second, rotates the spool along clockwise, emits and lifts by crane the cable, prevents that the heavy object from promoting rapidly, prevents accident.

Disclosure of Invention

In order to achieve the aim of avoiding the impact extrusion of the feeding of the casting, the invention provides the following technical scheme: the vehicle-hanging separation device of the automobile crane comprises an equipment shell and an installation shaft, wherein the interior of the equipment shell is movably connected with the installation shaft, the outer side of the installation shaft is movably connected with a winding shaft, the outer side of the winding shaft is movably connected with a hoisting cable, the interior of the winding shaft is provided with a movable groove, the inner wall of the movable groove is fixedly connected with a connecting spring, the outer side of the connecting spring is fixedly connected with a movable contact, the inner wall of the movable groove is fixedly connected with a fixed contact, the interior of the equipment shell is fixedly connected with a magnet filling block, the interior of the winding shaft is fixedly connected with a first closed conductor, the front side of the winding shaft is fixedly connected with a first fixed shaft, the outer side of the first fixed shaft is movably connected with a first connecting rod, the interior of the equipment shell is provided with an adjusting groove, the interior of the adjusting groove is movably connected with a reset spring, and the inner side of the reset spring is fixedly connected with a first magnetic block, the inside fixedly connected with first electro-magnet of equipment casing, the inside first diode of fixedly connected with of equipment casing, the closed conductor of the inside fixedly connected with second of spool, spool back fixedly connected with second fixed axle, second fixed axle outside swing joint has the second connecting rod, the inboard fixedly connected with second magnetism piece of reset spring, the inside fixedly connected with second electro-magnet of equipment casing, the inside fixedly connected with second diode of equipment casing, the inside through hole of having seted up of equipment casing.

Preferably, the bottom of the first magnetic block is fixedly connected with the top of the first connecting rod, the magnetism of the corresponding surface of the first magnetic block is the same as that of the first electromagnet, and a magnetic repulsive force is generated between the first magnetic block and the first electromagnet.

Preferably, the bottom of the second magnetic block is fixedly connected with the top of the second connecting rod, the magnetism of the corresponding surface of the second magnetic block is the same as that of the second electromagnet, and a magnetic repulsive force is generated between the second magnetic block and the second electromagnet.

As an optimization, the fixed contact is electrically connected to the first closed conductor, the moving contact is connected to the first diode through a wire, the first diode is connected to the first electromagnet through a wire, when the winding shaft rotates clockwise, the lifting cable lowers a heavy object, the first closed conductor cuts the magnetic induction line to generate current, and the first electromagnet is made to be magnetic through the first diode conducting circuit.

Preferably, the fixed contact is electrically connected to the second closed conductor, the movable contact is connected to the second diode through a wire, the second diode is connected to the second electromagnet through a wire, when the spool rotates clockwise, the lifting cable lowers a heavy object, the second closed conductor cuts the magnetic induction line to generate current, and the second electromagnet is made to be magnetic through the second diode conducting circuit.

Preferably, the first closing conductor and the second closing conductor are both located in the magnetic field environment of the magnet filling block, and the first closing conductor and the second closing conductor rotate synchronously along with the bobbin, so that when the bobbin rotates clockwise or counterclockwise, the directions of currents generated in the first closing conductor and the second closing conductor are opposite.

As an optimization, the first magnetic block and the second magnetic block are movably connected inside the adjusting groove, the first magnetic block and the second magnetic block are located on the same axis of the spool, and the first magnetic block and the second magnetic block move to respectively drive the first connecting rod and the second connecting rod to drive, so that the direction of the spool is adjusted.

Preferably, the back of the mounting shaft is fixedly connected with a driving mechanism, the outer side of the hoisting cable is movably connected inside the through hole, and the driving mechanism drives the mounting shaft to rotate so as to drive the winding shaft to rotate.

The method for separating the truck crane from the crane truck comprises the following specific steps:

s1, a driving mechanism is fixedly connected to the back of the mounting shaft, an operator opens a master control switch, and drives the mounting shaft to rotate through the driving mechanism, so that the winding shaft is driven to rotate;

s2, along with the rotation of the mounting shaft, the moving contact is acted by centrifugal force to move outwards along the movable groove, when the rotation speed of the mounting shaft is increased due to mechanical failure, the centrifugal force borne by the moving contact is increased, and at the moment, the moving contact and the fixed contact are contacted with each other;

s3, when the speed of the installation shaft is increased in the clockwise rotation process, the weight rapidly drops, the first closed conductor is located in the magnetic field environment of the magnet filling block and synchronously rotates along with the winding shaft, the first closed conductor cuts the magnetic induction line to generate current, and the first electromagnet is enabled to be magnetic through the first diode conducting circuit;

s4, magnetic repulsive force is generated between the first magnetic block and the first electromagnet, so that the first magnetic block moves inwards along the adjusting groove, the first magnetic block drives the first connecting rod to drive, the first connecting rod and the first fixed shaft form a shaft driving mechanism, the winding shaft rotates in the anticlockwise direction, the hoisting cable is wound, and the weight is prevented from falling;

s5, when the speed is increased in the process of anticlockwise rotation of the mounting shaft, the weight is rapidly lifted, the second closed conductor is located in the magnetic field environment of the magnet filling block and synchronously rotates along with the winding shaft, the second closed conductor cuts the magnetic induction lines to generate current, and the second electromagnet is enabled to be magnetic through the second diode conducting circuit;

s6, magnetic repulsion force is generated between the second magnetic block and the second electromagnet, so that the second magnetic block moves inwards along the adjusting groove, the second magnetic block drives the second connecting rod to drive, the second connecting rod and the second fixed shaft form a shaft driving mechanism, the winding shaft rotates clockwise, the hoisting cable is released, and the heavy object is prevented from being lifted rapidly.

The invention has the beneficial effects that:

1. this mobile crane's car hangs separator through producing the magnetism repulsive force between first magnetism piece and the first electro-magnet for first magnetism piece is along the inside removal of adjustment tank, and first magnetism piece drives first connecting rod drive this moment, and first connecting rod forms with first fixed axle and winds axle actuating mechanism, rotates the spool along anticlockwise direction, and the cable is lifted by crane in the rolling, prevents that the heavy object from weighing down, prevents accident.

2. This mobile crane's car hangs separator through producing the magnetism repulsive force between second magnetism piece and the second electro-magnet for the second magnetism piece inwards removes along the adjustment tank, and the second magnetism piece drives the drive of second connecting rod this moment, and second connecting rod and the fixed axle of second form around axle actuating mechanism, rotate the spool along clockwise, emit the cable of lifting by crane, prevent that the heavy object promotes rapidly, prevent accident.

Drawings

FIG. 1 is a schematic front view of the overall structure of the apparatus of the present invention;

FIG. 2 is a schematic front view of a magnet filler block according to the present invention;

FIG. 3 is a front view of a first linkage of the present invention;

FIG. 4 is a front view of a second link structure according to the present invention;

FIG. 5 is a front view of the bobbin of the present invention;

fig. 6 is a schematic front view of the structure of the movable trough of the present invention.

In the figure: 1. an equipment housing; 2. installing a shaft; 3. a spool; 4. hoisting the cable; 5. a movable groove; 6. a connecting spring; 7. a moving contact; 8. fixing a contact; 9. a magnet filling block; 10. a first closed conductor; 11. a first fixed shaft; 12. a first link; 13. an adjustment groove; 14. a return spring; 15. a first magnetic block; 16. a first electromagnet; 17. a first diode; 18. a second closed conductor; 19. a second fixed shaft; 20. a second link; 21. a second magnetic block; 22. a second electromagnet; 23. a second diode; 24. a through hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.

Referring to fig. 1-6, the car crane separating device of the automobile crane comprises an equipment housing 1 and an installation shaft 2, the interior of the equipment housing 1 is movably connected with the installation shaft 2, the outer side of the installation shaft 2 is movably connected with a winding shaft 3, the outer side of the winding shaft 3 is movably connected with a hoisting cable 4, the back of the installation shaft 2 is fixedly connected with a driving mechanism, the outer side of the hoisting cable 4 is movably connected with the interior of a through hole 24, the installation shaft 2 is driven to rotate by the driving mechanism, thereby driving the winding shaft 3 to rotate, a movable groove 5 is arranged in the winding shaft 3, the inner wall of the movable groove 5 is fixedly connected with a connecting spring 6, the outer side of the connecting spring 6 is fixedly connected with a movable contact 7, the inner wall of the movable groove 5 is fixedly connected with a fixed contact 8,

the inside of the equipment shell 1 is fixedly connected with a magnet filling block 9, the inside of the winding shaft 3 is fixedly connected with a first closed conductor 10, the front side of the winding shaft 3 is fixedly connected with a first fixed shaft 11, the outer side of the first fixed shaft 11 is movably connected with a first connecting rod 12, the inside of the equipment shell 1 is provided with an adjusting groove 13, the inside of the adjusting groove 13 is movably connected with a return spring 14, the inner side of the return spring 14 is fixedly connected with a first magnetic block 15, the inside of the equipment shell 1 is fixedly connected with a first electromagnet 16, the bottom of the first magnetic block 15 is fixedly connected with the top of the first connecting rod 12, the magnetism of the corresponding surface of the first magnetic block 15 and the first electromagnet 16 is the same, a magnetic repulsion force is generated between the first magnetic block 15 and the first electromagnet 16, the inside of the equipment shell 1 is fixedly connected with a first diode 17, the fixed contact 8 is electrically connected to the first closed conductor 10, and the movable contact 7 is electrically connected to the first diode 17, the first diode 17 is connected to the first electromagnet 16 through an electric wire, when the winding shaft 3 rotates clockwise, the hoisting cable 4 lowers a heavy object, the first closed conductor 10 cuts the magnetic induction line to generate current, and the circuit is conducted through the first diode 17, so that the first electromagnet 16 is electrified and has magnetism;

a second closed conductor 18 is fixedly connected inside the bobbin 3, the first closed conductor 10 and the second closed conductor 18 are both positioned inside the magnetic field environment of the magnet filling block 9, the first closed conductor 10 and the second closed conductor 18 rotate synchronously along with the bobbin 3, therefore, when the bobbin 3 rotates clockwise or anticlockwise, the directions of currents generated inside the first closed conductor 10 and the second closed conductor 18 are opposite, a second fixed shaft 19 is fixedly connected on the back surface of the bobbin 3, a second connecting rod 20 is movably connected on the outer side of the second fixed shaft 19, a second magnetic block 21 is fixedly connected on the inner side of the return spring 14, a second electromagnet 22 is fixedly connected inside the equipment shell 1, the bottom of the second magnetic block 21 is fixedly connected with the top of the second connecting rod 20, the magnetism of the corresponding surface of the second magnetic block 21 and the second electromagnet 22 is the same, and magnetic repulsion force is generated between the second magnetic block 21 and the second electromagnet 22, a second diode 23 is fixedly connected inside the device shell 1, the fixed contact 8 is electrically connected to the second closed conductor 18, the movable contact 7 is electrically connected to the second diode 23, the second diode 23 is electrically connected to the second electromagnet 22, when the winding shaft 3 rotates clockwise, the hoisting cable 4 lowers the heavy object, at the moment, the second closed conductor 18 cuts the magnetic induction line to generate current, the circuit is conducted through the second diode 23, so that the second electromagnet 22 is electrified and has magnetism, the first magnetic block 15 and the second magnetic block 21 are movably connected inside the adjusting groove 13, the first magnetic block 15 and the second magnetic block 21 are positioned on the same axis of the winding shaft 3, the first magnetic block 15 and the second magnetic block 21 move to respectively drive the first connecting rod 12 and the second connecting rod 20 to drive, so that the direction of the winding shaft 3 is adjusted, and a through hole 24 is formed in the equipment shell 1.

The method for separating the truck crane from the crane truck comprises the following specific steps:

s1, a driving mechanism is fixedly connected to the back of the mounting shaft 2, an operator turns on a master control switch, the mounting shaft 2 is driven to rotate through the driving mechanism, so that the winding shaft 3 is driven to rotate, when the winding shaft 3 rotates clockwise, the heavy object is placed down by the hoisting cable 4, and when the winding shaft 3 rotates anticlockwise, the heavy object is lifted by the hoisting cable 4;

s2, along with the rotation of the mounting shaft 2, the moving contact 7 is acted by centrifugal force to move outwards along the movable slot 5, when the rotation speed of the mounting shaft 2 increases due to mechanical failure, the centrifugal force applied to the moving contact 7 increases, and at this time, the moving contact 7 and the fixed contact 8 contact each other;

s3, when the speed is increased in the clockwise rotation process of the mounting shaft 2, the weight rapidly drops, the first closed conductor 10 is located in the magnetic field environment of the magnet filling block 9, the first closed conductor 10 synchronously rotates along with the winding shaft 3, at the moment, the first closed conductor 10 cuts the magnetic induction line to generate current, and the first diode 17 conducts the circuit, so that the first electromagnet 16 is electrified and has magnetism;

s4, magnetic repulsive force is generated between the first magnetic block 15 and the first electromagnet 16, so that the first magnetic block 15 moves inwards along the adjusting groove 13, at the moment, the first magnetic block 15 drives the first connecting rod 12 to drive, the first connecting rod 12 and the first fixed shaft 11 form a shaft-rotating driving mechanism, the winding shaft 3 rotates along the anticlockwise direction, the hoisting cable 4 is wound, and weight falling is prevented;

s5, when the speed is increased in the process of anticlockwise rotation of the mounting shaft 2, the weight is rapidly lifted, the second closed conductor 18 is located in the magnetic field environment of the magnet filling block 9, the second closed conductor 18 synchronously rotates along with the winding shaft 3, at the moment, the second closed conductor 18 cuts the magnetic induction line to generate current, and the circuit is conducted through the second diode 23, so that the second electromagnet 22 is electrified and has magnetism;

s6, a magnetic repulsive force is generated among the second magnetic block 21 and the second electromagnet 22, so that the second magnetic block 21 moves inwards along the adjusting groove 13, at the moment, the second magnetic block 21 drives the second connecting rod 20 to drive, the second connecting rod 20 and the second fixed shaft 19 form a shaft-rotating driving mechanism, the winding shaft 3 rotates clockwise, the hoisting cable 4 is released, and the heavy object is prevented from being lifted rapidly.

To sum up, in the vehicle crane separation device of the automobile crane, the driving mechanism is fixedly connected to the back of the installation shaft 2, an operator opens the master control switch, the installation shaft 2 is driven to rotate through the driving mechanism, so that the winding shaft 3 is driven to rotate, when the winding shaft 3 rotates clockwise, the heavy object is placed by the hoisting cable 4, when the winding shaft 3 rotates anticlockwise, the heavy object is lifted by the hoisting cable 4, along with the rotation of the installation shaft 2, the movable contact 7 moves outwards along the movable groove 5 under the action of centrifugal force, when the rotation speed of the installation shaft 2 is increased due to mechanical failure, the centrifugal force applied to the movable contact 7 is increased, and at the moment, the movable contact 7 and the fixed contact 8 are in contact with each other;

when the speed is increased in the clockwise rotation process of the mounting shaft 2, the heavy object rapidly drops, the first closed conductor 10 is located in the magnetic field environment of the magnet filling block 9, the first closed conductor 10 synchronously rotates along with the winding shaft 3, at the moment, the first closed conductor 10 cuts a magnetic induction line to generate current, a circuit is conducted through the first diode 17, the first electromagnet 16 is electrified and has magnetism, a magnetic repulsive force is generated between the first magnetic block 15 and the first electromagnet 16, the first magnetic block 15 moves inwards along the adjusting groove 13, at the moment, the first magnetic block 15 drives the first connecting rod 12 to drive, the first connecting rod 12 and the first fixing shaft 11 form a shaft driving mechanism, the winding shaft 3 rotates along the anticlockwise direction, the hoisting cable 4 is wound, and the heavy object is prevented from dropping;

when the speed is increased in the process of anticlockwise rotating the mounting shaft 2, the weight is rapidly lifted, the second closed conductor 18 is located in the magnetic field environment of the magnet filling block 9, the second closed conductor 18 rotates synchronously with the winding shaft 3, at the moment, the second closed conductor 18 cuts the magnetic induction line to generate current, a circuit is conducted through the second diode 23, the second electromagnet 22 is electrified and has magnetism, a magnetic repulsive force is generated between the second magnetic block 21 and the second electromagnet 22, the second magnetic block 21 moves inwards along the adjusting groove 13, at the moment, the second magnetic block 21 drives the second connecting rod 20 to drive, the second connecting rod 20 and the second fixing shaft 19 form a shaft driving mechanism, the winding shaft 3 rotates clockwise, the hoisting cable 4 is released, and the weight is prevented from being rapidly lifted.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.