A clutch device for overspeed protection of lifting machinery

Abstract

The present invention provides a lifting machinery overspeed protection clutch device, which relates to the technical field of lifting machinery safety protection. The lifting machinery overspeed protection clutch device comprises a driven ratchet rotatably mounted on a support end cover; a load mechanism connected to the end of the driven ratchet; a driving hub fixedly connected to the support end cover; an active ratchet coaxially arranged with the driven ratchet and capable of being mutually engaged after being matched and connected with the driven ratchet; a clutch provided between the active ratchet and the driven ratchet and providing a preload force F d The first spring is disposed between the active ratchet and the active hub and can apply an axial thrust F to the inclined surface of the active ratchet through centrifugal force during rotation. t The centrifugal block of the present invention adopts a fully mechanical structure to ensure reliable protection when the system loses power. The protection device is designed as an integrated independent component and is connected to the rotating component of the lifting mechanism. It has good versatility and adaptability and can be applied to overspeed protection of various lifting machinery.

Description

Technical Field

[0001] The invention relates to the technical field of safety protection of lifting machinery, in particular to an overspeed protection clutch device for lifting machinery. Background Art

[0002] During operation, equipment with potential loads such as cranes, elevators and stackers may cause the lifting mechanism to fall at an overspeed due to various abnormal factors, such as motor phase loss, overweight lifting, brake failure or electrical system out of control. Although some lifting machinery is equipped with a rope break protection device, it will only work when the wire rope breaks and the wire rope completely loses its tension. Therefore, it is powerless to protect against overspeed descent conditions when there is still a small tension in the wire rope.

[0003] For example, the relevant patent documents are as follows: 1. Invention name: Elevator overspeed protection device, application number CN108584603A, publication (announcement number): CN108584603A, applicant (patent holder): Huzhou Demagi Elevator Co., Ltd. Inventor (designer): Yang Ronggen; Song Yu; Rao Shugang. This patent relates to the field of elevator safety protection technology, and the invention discloses an elevator overspeed protection device. This device drives the centrifugal box to rotate through a guide wheel. When the elevator car is overspeeding, the centrifugal force mechanically triggers the locking unit to act on the deceleration rail to slow down or stop the car; by setting a separate guide wheel and guide rail, the car is more stable during braking and deceleration, avoiding uneven force and causing the car to shake;

[0004] 2. Name of the invention: Elevator, overspeed protection system and triggering device thereof, application number CN201910191770.1, publication (announcement number): CN109775507A, applicant (patent holder): Hitachi Elevator (China) Co., Ltd. Inventor (designer): Xie Wei; Liu Shutang. This patent relates to the field of elevator safety protection technology. The present invention discloses an elevator, an overspeed protection system and a triggering device thereof, the triggering device comprising: a first transmission member and an elastic reset member, a triggering member being provided at one end of the first transmission member, the other end of the first transmission member being triggered and cooperating with the safety clamp, one end of the elastic reset member being connected to the first transmission member or to the triggering member, so that the triggering member is arranged in contact with the outer wall of the rotating body; wherein, when the car is speeding downward, the triggering member is separated from the rotating body and the other end of the first transmission member triggers the safety clamp to work;

[0005] 3. Invention name: Vertical lifting full-process overspeed protection system, application number CN201910769770.5, public (announcement number): CN110422720A, applicant (patent holder): Wuhan Yunzhu Electromechanical New Technology Development Co., Ltd. Inventors (designers): Wen Yaping; Xu Xiaojian; Wang Yong; Tong Zhihong; Song Xiaoyu; Sun Wenzhan; Duan Aolin; Ma Wenwen; Zuo Jian; Qu Yi; Zheng Renjie. This patent relates to the technical field of safety protection of lifting machinery. The invention relates to a vertical lifting full-range overspeed protection system, including a vertical lifting device, the vertical lifting device includes a lifting container and a lifting winch for lifting the lifting container, and an anti-collision beam is also provided directly above the lifting container; the system also includes a steel belt brake device, a steel rope capture device and a controller, the steel belt brake device is fixedly installed on the anti-collision beam, and the lower end of the steel belt of the steel belt brake device is connected to a brake steel rope; the steel rope capture device is installed on the lifting container, the steel rope capture device is used to capture the brake steel rope, and the steel rope capture device is triggered by an electromagnetic switch; the lifting winch is provided with a speed encoder for measuring the rotation speed of the lifting winch, the speed encoder is connected to the controller, the controller is also connected to the electromagnetic switch, and the controller is used to control the electromagnetic switch according to the speed signal of the speed encoder;

[0006] 4. Invention name: A stacker loading platform overspeed protection device, application number CN201910963342.6, publication (announcement number): CN110615380A, applicant (patent holder): Robotech Automation Technology (Suzhou) Co., Ltd. Inventor (designer): Zhou Weicun; Wang Jianxing. The patent relates to the technical field of safety protection for aisle stacking cranes, and includes an overspeed protection device for a stacker platform, wherein the overspeed protection device for the stacker platform is installed on the stacker platform, and the stacker platform can move up and down along a guide track preset on a stacker column under the traction of a traction rope, and the stacker platform protection device is composed of a safety clamp and a safety clamp triggering mechanism, and the safety clamp triggering mechanism includes a pulley traction part and a lever triggering part, and the pulley traction part and the lever triggering part are movably connected; wherein the pulley guide part is connected to the traction rope, and the lever triggering part is connected to the safety rope, and the safety rope is connected to the speed limiter of the platform, wherein the pulley traction part is installed with a spring mechanism, wherein the traction force of the traction rope and the elasticity of the spring structure form a balance with the tension of the safety rope transmitted from the lever triggering part;

[0007] 5. Invention name: Elevator system, application number CN201910689626.0, publication (announcement number): CN110872040A, applicant (patent holder): KONE Co., Ltd. Inventor (designer): A. Catenen; J. Cantola. The patent relates to the technical field of elevator safety protection. According to one aspect, an elevator system is provided, which includes an elevator car (202) configured to move in an elevator shaft (200); a main safety controller (106) including a main safety output (108) and a secondary safety output (110), wherein the main safety output (108) is configured to control a mechanical brake of the elevator car (202); and a secondary safety circuit (102) connected to the secondary safety output (110) and arranged in the elevator car (202) and including at least one safety contact configured to control a stopping device (104) arranged in the elevator car (202); wherein when at least one safety contact is triggered, the secondary safety circuit (102) is configured to control the stopping device to stop the elevator car (202);

[0008] 6. Invention name: Overspeed protection method, device and equipment for hoisting machinery and its hoisting mechanism, application number CN201911049404.9, publication (announcement number): CN110963415A, applicant (patent right): Xinjiang Engineering College. Inventors (designers): Zhu Tingting; Chen Fei; Ye Wei; Lu Jian; Wang Yuan; Zhang Hongxia; Fan Xiaoli. This patent relates to the field of safety protection technology for hoisting machinery, and discloses an overspeed protection method for the hoisting mechanism of a hoisting machinery, which is applied to hoisting machinery. The overspeed protection method for the hoisting mechanism of a hoisting machinery includes: obtaining the rotor electrical frequency value of the hoisting mechanism winch motor; judging whether the rotor electrical frequency value exceeds the preset overspeed frequency value; wherein the preset overspeed frequency value is the rotor electrical frequency value when the descent speed of the hoisting mechanism is a preset multiple of the rated descent speed; wherein the preset multiple is the safety multiple specified in the safety regulations; if the judgment result is yes, the control coil circuit of the main contactor of the main control circuit of the hoisting mechanism of the hoisting machinery is cut off, so that the hoisting motor stops. In this way, when a fault such as overspeed falling occurs, the rotor electrical frequency value exceeds the preset overspeed frequency value, and when the rotor electrical frequency value exceeds the preset overspeed frequency value, the control coil circuit of the main contactor of the main control circuit of the hoisting mechanism of the lifting machinery is cut off, so that the winch motor is stopped to avoid the occurrence;

[0009] 7. Invention name: An elevator overspeed protection device, application number CN201920640454.3, publication (announcement number): CN209974038U, applicant (patent right): Hangzhou Yunding Elevator Engineering Co., Ltd. Inventor (designer): Yu Xin; Zhang Jinqiu. This patent relates to the technical field of elevator safety protection, and the utility model discloses an elevator overspeed protection device. It relates to the technical field of elevator protection equipment. The utility model includes a bracket and a guide rail, the bracket is a rectangular frame structure, and two grooves are correspondingly opened on the opposite side plates of the bracket; the guide rail passes through the two grooves; a synchronous frame is installed in the bracket, and the through holes opened on the opposite side plates of the synchronous frame correspond to the through holes opened on the opposite side plates of the bracket; a left clamp body is installed on the left side of the synchronous frame, and a fixed block is fixed on one side of the left clamp body; a right clamp body is installed on the right side of the synchronous frame, and a movable wedge is slidably installed on one side of the right clamp body; the left clamp body and the right clamp body are installed by different bolts that pass through the side plates of the bracket and the side plates of the synchronous frame in sequence. The utility model limits the movement direction of the left clamp body and the right clamp body by means of the guide plate, thereby ensuring the reliability during the deceleration process;

[0010] 8. Invention name: A stacker loading platform overspeed protection device, application number CN201920713067.8, publication (announcement number): CN210313309U, applicant (patent holder): Tianhai Oukang Technology Information (Xiamen) Co., Ltd. Inventor (designer): Ding Yong; Zeng Yan; Zhang Tao. This patent relates to the field of safety protection technology for tunnel stacking cranes. The utility model discloses a stacker loading platform overspeed protection device, the loading platform moves up and down along two parallel column guide rails and is driven by a steel wire, including: a connecting shaft, the connecting shaft is fixedly connected to the loading platform through a bearing seat, the two ends of the connecting shaft are respectively fixedly connected to the first connecting rod and the second connecting rod, the first connecting rod and the second connecting rod are perpendicular to the connecting shaft; a first safety clamp, a second safety clamp, a speed limiter and a speed limiter wire rope, the speed limiter can lock the speed limiter wire rope when the speed limiter wire rope reaches a preset speed. When the cargo platform descends at an excessive speed and reaches the preset speed of the speed limiter, the speed limiter wire rope stops, thereby stopping the connecting rod. The continued descent of the cargo platform will force the connecting rod to drive the safety clamp upward, thereby causing the safety clamp to be clamped to the column guide rail for fixation.

[0011] The technical solutions provided by the above-mentioned patent documents, as well as other various forms of overspeed protection devices that have appeared at present, all adopt the following two working principles: one is to measure the speed or rotation speed of the lifting mechanism through a sensor, and the overspeed protection function is realized by the electrical control system. The advantages of this solution are simple structure, easy implementation, and low cost, but it is powerless against overspeed caused by failures of the motor, brake, power supply and electrical control system, and its reliability is poor. The second is to set a mechanical device to sense the descending speed of the lifting load, and use a rail clamp in combination with a broken rope protection device or a rail clamp alone to achieve emergency braking after overspeeding. The advantages of this solution are direct braking of the lifting load, preventing a full range of faults, and adopting a fully mechanical structure, which is not affected by power supply and electrical control system failures. However, it generally requires a rigid track, and the speed sensing device often needs to be set at the lifting load. A device such as a wire rope that converts translational motion into rotational motion is also set. The structure is complex, the adaptability is poor, and it is difficult to modify, install and adjust. Summary of the invention

[0012] The object of the present invention is to provide a lifting machinery overspeed protection clutch device, which has the characteristics of compact structure, full mechanical, modular, easy installation and debugging, applicable to most lifting machinery applications and able to connect to steady-speed loads with different characteristics as needed, and can complement the protection function of the rope breaking protection device to achieve comprehensive safety protection against falling of the hoisted load, so as to solve the problems mentioned in the background technology.

[0013] To achieve the above object, the present invention adopts the following technical solution: the overspeed protection clutch device of the lifting machinery comprises a driven ratchet rotatably mounted on the support end cover; a load mechanism connected to the end of the driven ratchet; a driving hub fixedly connected to the support end cover; a driving ratchet coaxially arranged with the driven ratchet and capable of being mutually engaged after being matched and connected with the driven ratchet; a driving ratchet arranged between the driving ratchet and the driven ratchet and providing a preload force F d The first spring is disposed between the active ratchet and the active hub and can apply an axial thrust F to the inclined surface of the active ratchet through centrifugal force during rotation. t centrifugal block; Among them, when the driving hub is at normal speed, F d >F t , the driven ratchet and the active ratchet are separated, and when the active wheel hub is at an overspeed, F d <F t , the driven ratchet and the active ratchet are engaged.

[0014] A further technical solution of the present invention is that the active ratchet is connected to the central shaft end of the active hub via a spline, so that the active ratchet follows the rotation of the active hub and has the ability to move axially relative to the active hub.

[0015] A further technical solution of the present invention: the centrifugal block is a steel ball or a steel column, and the opposite sides of the active ratchet and the active hub are both inclined to form a groove-shaped cavity, and the cross-section of the groove-shaped cavity is a cone shape with the side facing the axis as the wide end and the side away from the axis as the narrow end.

[0016] A further technical solution of the present invention is that the driving hub is connected to the output shaft of the motor of the lifting mechanism, the output shaft of a drum, a traction wheel or a reducer.

[0017] A further technical solution of the present invention: the first spring is a butterfly spring with small axial size, good dynamic balance and nonlinear characteristics.

[0018] A further technical solution of the present invention also includes an overspeed regulating device arranged on the driving hub.

[0019] A further technical solution of the present invention: the overspeed regulating device includes an adjusting round nut threadedly connected to the central shaft end of the driving hub, and an adjusting disc in contact with the adjusting round nut is movably sleeved on the central shaft end of the driving hub. The adjusting disc is connected to the side of the driving hub via a second spring, an adjusting pendulum is contacted on the adjusting disc, the centrifugal block is in contact with the inclined surface of the adjusting pendulum, and one end of the adjusting pendulum is hinged to the driving hub.

[0020] A further technical solution of the present invention: the driven ratchet and the active ratchet adopt a one-way clamping limit structure or a two-way clamping limit structure to achieve one-way rotation limit or two-way rotation limit of the driven ratchet on the active ratchet.

[0021] A further technical solution of the present invention is as follows: the driven ratchet is provided with an axial hole with a keyway, and the axial hole with the keyway can be matched and connected with a main shaft with a flat key on the load mechanism.

[0022] A further technical solution of the present invention also includes a sensor for detecting the engagement state of the driven ratchet and the active ratchet or for detecting the rotation state of the driven ratchet, and the sensor is electrically connected to the electrical control system of the load mechanism and the alarm.

[0023] The beneficial effects of the present invention are as follows: the present invention adopts a fully mechanical structure to ensure reliable protection when the system loses power. The protection device is designed as an integrated independent component, which is connected to the rotating part of the lifting mechanism. It has good versatility and adaptability and can be applied to overspeed protection of various lifting machinery. It can even be used in any occasions where overspeed protection of rotating parts is required, such as wind turbines, sliding vehicles and amusement facilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1It is a structural schematic diagram of a specific embodiment of a lifting machinery overspeed protection clutch device.

[0025] Figure 2 It is a force analysis diagram of the flying block in a specific embodiment of the overspeed protection clutch device of the lifting machinery.

[0026] Figure 3 It is an overspeed protection characteristic diagram in a specific embodiment of an overspeed protection clutch device for a lifting machinery. DETAILED DESCRIPTION

[0027] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0028] like Figure 1-3 As shown, a clutch device for overspeed protection of a lifting machinery comprises a driven ratchet 3 rotatably mounted on a support end cover 2; a load mechanism connected to the end of the driven ratchet 3; a driving hub 6 fixedly connected to the support end cover 2; a driving ratchet 5 coaxially arranged with the driven ratchet 3 and capable of being mutually engaged after being matched and connected with the driven ratchet 3; a preload mechanism provided between the driving ratchet 5 and the driven ratchet 3 and providing a preload force F d The first spring 4; disposed between the active ratchet 5 and the active hub 6 and can apply an axial thrust F to the inclined surface of the active ratchet 5 by centrifugal force during rotation t wherein, when the driving hub 6 is at normal speed, F d >F t , the driven ratchet 3 and the active ratchet 5 are separated, and when the active hub 6 is at an overspeed, F d <F t , the driven ratchet 3 and the active ratchet 5 are engaged.

[0029] In a specific embodiment, the active ratchet 5 is connected to the central shaft end of the active hub 6 via a spline, so that the active ratchet 5 rotates with the active hub 6 and the active ratchet 5 has the ability to move axially relative to the active hub 6.

[0030] Preferably, in order to adapt to the needs of changing the angle of the inclined surface, the centrifugal block 8 is a steel ball or a steel column. The number and mass of the centrifugal blocks 8 are determined according to the structure and centrifugal force requirements, the diameter is determined according to the ratchet stroke, and the opposite sides of the active ratchet 5 and the active hub 6 are inclined surfaces to form a groove-shaped cavity 61. The cross-section of the groove-shaped cavity 61 is a cone shape with the side facing the axis as the wide end and the side away from the axis as the narrow end.

[0031] Preferably, the active ratchet 5 and the driven ratchet 3 adopt axial ratchets with compact structure, stable connection and good connection synchronization, and the angle of the ratchet tooth connection surface needs to be designed and calculated according to the needs of overspeed protection and ratchet connection.

[0032] Preferably, the driving hub 6 is connected to the output shaft of the motor of the lifting mechanism, a drum, a traction wheel or an output shaft of a reducer.

[0033] Preferably, the first spring 4 is a butterfly spring with small axial size, good dynamic balance and nonlinear characteristics. The parameters of the butterfly spring need to be calculated and determined based on the set value of the overspeed protection. If the stroke of the active ratchet 5 is large, multiple butterfly springs can be connected in series.

[0034] Preferably, the driven ratchet 3 is supported on the supporting end cover 2 through a bearing 1, and the supporting end cover 2 and the driving hub 6 are connected by screws.

[0035] In a specific embodiment, it also includes an overspeed regulating device arranged on the driving hub 6, and the overspeed regulating device includes an adjusting circular nut 11 threadedly connected to the central shaft end of the driving hub 6, and an adjusting disc 9 in contact with the adjusting circular nut 11 is also movably sleeved on the central shaft end of the driving hub 6, and the adjusting disc 9 is connected to the side of the driving hub 6 through a second spring 10. Preferably, the second spring 10 is a butterfly spring, and an adjusting pendulum 7 is contacted on the adjusting disc 9, and the centrifugal block 8 is in contact with the inclined surface of the adjusting pendulum 7, and one end of the adjusting pendulum 7 is hinged to the driving hub 6.

[0036] Optionally, the driven ratchet 3 and the active ratchet 5 adopt a unidirectional clamping limiting structure or a bidirectional clamping limiting structure to achieve unidirectional rotation limiting or bidirectional rotation limiting of the driven ratchet 3 on the active ratchet 5 .

[0037] Preferably, the driven ratchet 3 is provided with an axial hole 31 with a keyway, and the axial hole 31 with the keyway can be matched and connected with a main shaft with a flat key on the load mechanism.

[0038] In a specific embodiment, a sensor (not shown) is further included for detecting the engagement state of the driven ratchet 3 and the active ratchet 5 or for detecting the rotation state of the driven ratchet 3. The sensor is electrically connected to the electrical control system and the alarm of the load mechanism. The sensor signal can be used to obtain whether there is an abnormal state of overspeed, so that the electrical control system can achieve steady speed or brake shutdown protection, and can also realize alarm. Its setting will not have an adverse effect on the overspeed protection of the device.

[0039] The specific working principle is as follows: in the rotating state, the flyweight 8 is subjected to centrifugal force, so the steel ball or steel column-shaped flyweight 8 converts the rotation speed of the lifting mechanism motor or drum into centrifugal force, and generates an axial thrust on the active ratchet 5 by adjusting the inclined surface of the pendulum 7, which is balanced with the preload of the first spring 4; when overspeeding, the force balance is destroyed, so that the active ratchet 5 is engaged with the driven ratchet 3. Since the driven ratchet 3 is connected to the load, the potential energy is consumed, so that the lifting mechanism reaches a steady speed; when the speed returns to normal and reaches the set value, the elastic force of the first spring 4 is greater than the axial thrust generated by the centrifugal force, and the active ratchet 5 is separated from the driven ratchet 3 and returns to a normal working state; the present invention has a thrust adjustment mechanism, which can meet the needs of different overspeed protection; through the design of relevant parameters, it can ensure that the active ratchet 5 is fully toothed with the driven ratchet 3, and the overspeed protection has a hysteresis characteristic to prevent the defect of frequent clutch in the overspeed critical area.

[0040] The key parameters of the present invention need to be designed and calculated according to the needs of overspeed protection. The key parameters mainly include: flyweight mass, inclined plane inclination, butterfly spring characteristic parameters, active ratchet moving distance and ratchet bevel angle, etc. Their design and calculation methods are specifically described as follows:

[0041] By Figure 2 The flying block force diagram shown in the figure can be obtained:

[0042]

[0043] Centrifugal force:

[0044]

[0045] Wherein m is the total mass of the flying mass 8, r is the radius of gyration of the center of mass of the flying mass, and ω is the angular velocity of the driving hub 6.

[0046] The thrust Ft generated by the centrifugal force of the active ratchet 5 is equal to Fj1, so from formula (4) we can get:

[0047] (5)

[0048] Assume that the initial radius of gyration of the mass center of the flyweight is r0, and the pre-compression of the butterfly spring 4 is x0. When the flyweight 8 produces a radial displacement ∆r under the action of centrifugal force, it will push the butterfly spring 4 to further compress, and the additional compression is ∆x. Then:

[0049]

[0050] Formula (5) can be written as:

[0051]

[0052] According to the characteristics of the butterfly spring, at a certain angular velocity ω, the active ratchet 5 thrust Ft The function relationship with x can be plotted as Figure 3 The two curves.

[0053] according to Figure 3 As shown, the first spring 4 of the butterfly spring is selected from type A or B. Type C may reverse and cannot be restored. When the angular velocity reaches the overspeed critical angular velocity Finally, the nonlinear butterfly spring helps to reduce the thrust F of the active ratchet 5 t Exceeds the preload F of butterfly spring 4 d0 After that, F t Increase ratio F d The increase is much faster, ensuring full tooth length engagement of the ratchet and causing the ratchet to engage quickly.

[0054] from Figure 3 It can be seen that in order to protect the clutch from overspeeding and enable it to quickly enter full-length meshing, and to ensure that the overspeed protection action responds quickly and works reliably, it is necessary to ensure that conditions.

[0055] When the overspeed causes the ratchet to fully engage, the butterfly spring produces an additional displacement ∆x, and the radius of gyration of the flyweight increases ∆r. At this time, in order to separate the ratchet, the angular velocity of the active ratchet 5 must drop to the separation angular velocity .because Therefore, the overspeed protection clutch has a hysteresis effect, which can prevent the ratchet from frequently engaging and disengaging when it is near the overspeed setting value. The value can be determined by selecting the H / t value of the butterfly spring.

[0056] When there is friction between the flying weight 8 and the inclined surface, the friction angle and its direction will also increase. and However, due to the small friction angle and unstable performance during dynamic operation, it can be ignored during design.

[0057] In addition, the hysteresis effect can also be achieved by changing the angle of the ratchet tooth profile. However, this method is affected by the steady-speed load in addition to the tooth profile angle. Therefore, it should not be too large, and it is generally better to be less than 10°. Figure 1 The ratchet bevel angles of the active ratchet 5 and the driven ratchet 3.

[0058] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0060] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims

1. A clutch device for overspeed protection of a lifting machinery, characterized in that: Comprising: A driven ratchet wheel (3) rotatably mounted on a support end cover (2); A load mechanism connected to the end of the driven ratchet wheel (3); A driving hub (6) fixedly connected to the support end cover (2); A driving ratchet wheel (5) coaxially arranged with the driven ratchet wheel (3) and capable of being engaged with each other after being cooperatively connected with the driven ratchet wheel (3); A first spring (4) provided between the driving ratchet wheel (5) and the driven ratchet wheel (3) and providing a pre-tightening force Fd; A centrifugal block (8) provided between the driving ratchet wheel (5) and the driving hub (6) and capable of applying an axial thrust Ft to the inclined surface of the driving ratchet wheel (5) by centrifugal force during rotation; Wherein, when the driving hub (6) is at a normal speed, Fd > Ft, the driven ratchet wheel (3) and the driving ratchet wheel (5) are separated, and when the driving hub (6) is at an overspeed, Fd < Ft, the driven ratchet wheel (3) and the driving ratchet wheel (5) are engaged; The centrifugal block (8) is a steel ball or a steel column, and the opposite sides of the driving ratchet wheel (5) and the driving hub (6) are both inclined surfaces to form a groove-shaped cavity (61), and the cross-section of the groove-shaped cavity (61) is tapered with the side facing the axis being the wide end and the side away from the axis being the narrow end; It further includes an overspeed regulating device provided on the driving hub (6); The overspeed regulating device includes an adjusting round nut (11) threadedly connected to the central shaft end of the driving hub (6), and an adjusting disc (9) is also movably sleeved on the central shaft end of the driving hub (6) and contacts the adjusting round nut (11). The adjusting disc (9) is connected to the side surface of the driving hub (6) through a second spring (10). An adjusting pendulum (7) is contactingly arranged on the adjusting disc (9). The centrifugal block (8) contacts the inclined surface of the adjusting pendulum (7), and one end of the adjusting pendulum (7) is hinged to the driving hub (6).

2. The overspeed protection clutch device for hoisting machinery according to claim 1 is characterized in that: The driving ratchet wheel (5) is connected to the central shaft end of the driving hub (6) through a spline, so that while the driving ratchet wheel (5) follows the driving hub (6) to rotate, the driving ratchet wheel (5) has the ability to axially move relative to the driving hub (6).

3. The overspeed protection clutch device for hoisting machinery according to claim 1 is characterized in that: The driving hub (6) is connected to the output shaft of the motor of the hoisting mechanism, the drum, the traction wheel or the output shaft of the reducer.

4. The overspeed protection clutch device for hoisting machinery according to claim 1 is characterized in that: The first spring (4) is a disc spring.

5. The overspeed protection clutch device for hoisting machinery according to any one of claims 1 to 4, characterized in that: The driven ratchet wheel (3) and the driving ratchet wheel (5) adopt a one-way engagement limiting structure or a two-way engagement limiting structure to realize one-way rotation limiting or two-way rotation limiting of the driven ratchet wheel (3) to the driving ratchet wheel (5).

6. The overspeed protection clutch device for hoisting machinery according to any one of claims 1 to 4, characterized in that: A shaft hole (31) with a keyway is formed on the driven ratchet wheel (3), and the shaft hole (31) with the keyway can be cooperatively connected with the main shaft with a flat key on the load mechanism.

7. The overspeed protection clutch device for hoisting machinery according to any one of claims 1 to 4, characterized in that: It further includes a sensor for detecting the engagement state of the driven ratchet wheel (3) and the driving ratchet wheel (5) or for detecting the rotation state of the driven ratchet wheel (3), and the sensor is electrically connected to the electrical control system of the load mechanism and the alarm.

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