Anti-skid brake for hoisting overspeed slow descending

Abstract

An infrared steel wire rope speed sensor is used for detecting the running speed of a steel wire rope in real time, a signal line is used for transmitting a signal, and a main gear rotates to enable a rack to slide up and down to drive a large gear to rotate, so that a brake rod stretches out in the direction of the steel wire rope; and the friction cone penetrates into the steel wire rope to lock the steel wire rope so as to reduce the speed. The device is characterized by comprising an overspeed slow descent brake fixing frame, an infrared steel wire rope speed sensor, a motor support, a motor, a signal line, a main gear, a sliding rib, a rack, a sliding groove, a large gear, a large gear fixing disc, a fixing screw, a steel wire rope sliding groove, a steel wire rope, an arc sliding groove, a sliding hole, a brake rod, a reset spring, a wire connector, a rectangular protrusion and a cuboid friction cone. And the inclined cylinder friction cone is arranged on the inclined cylinder bulge.

Description

Technical Field

[0001] The invention discloses an overspeeding slow-descent anti-skid brake for lifting, which relates to an overspeeding slow-descent brake capable of performing slow-descent braking on a small crane when a heavy object is overspeeding, and belongs to the technical field of crane slow-descent, and particularly relates to an overspeeding slow-descent brake for a small crane, which detects the running speed of a wire rope in real time through an infrared wire rope speed sensor, transmits a signal through a signal line, rotates a main gear to slide a rack up and down to drive a large gear to rotate so that a brake rod extends toward the wire rope, penetrates into the wire rope through a friction cone to lock the wire rope to reduce the speed. Background Art

[0002] Small cranes play an important role in many fields such as construction, warehousing, manufacturing, maintenance, home, farm and dock. They are ideal tools for various handling and lifting tasks with their high flexibility, simple operation, convenient maintenance and high cost-effectiveness. However, when the load changes or the environment is complex, the speed of small cranes is difficult to control stably and overspeed is prone to occur. Overspeeding will cause additional wear on mechanical parts, shorten equipment life and increase maintenance costs. At the same time, when the crane fails mechanically or fails to operate correctly, it cannot automatically slow down or stop, causing the load to fall out of control, increasing the risk of serious accidents, which may cause casualties and property losses. Therefore, it is necessary to set brakes to limit the overspeed of the crane. The most common small crane overspeeding brake is There are inertia brakes, foot-operated variable frequency brakes, two-step superimposed electric hydraulic drum brakes, disc brakes and electromagnetic brakes. These brakes meet the braking needs of cranes to varying degrees, but there are also some limitations, such as complex structure, imprecise braking force control, and insufficient adaptability to different working conditions. Existing technology makes it difficult to achieve real-time monitoring and rapid response to wire rope speed. Its mechanical transmission is not precise enough, and its reset mechanism is relatively rigid. It cannot effectively guarantee the slow-down braking effect of small cranes when lifting heavy objects at overspeed, which reduces the safety and stability of crane operation. In the event of an emergency, it relies on manual intervention, has a slow reaction speed, and cannot brake quickly, making it difficult to avoid accidents in time. In addition, operators need to concentrate highly, and any negligence may lead to danger.

[0003] In order to improve the above problems, the applicant filed a Chinese invention patent application entitled "A Crane Overspeed Slow-Down Brake", which detects the running speed of the wire rope in real time through an infrared wire rope speed sensor, transmits signals through a signal line, and drives the disc rocker to rotate through a motor so that the U-shaped slider extends out to clamp the wire rope to slow down. However, during use, the above-mentioned overspeed slow-down brake only extends multiple U-shaped sliders at the same time to clamp the wire rope to achieve speed limiting of the heavy objects hoisted by the crane. However, the end of the U-shaped slider that contacts the wire rope is a flat structure with low friction. When lifting heavy objects, the wire rope is easy to slip. If slipping occurs, the goods may fall quickly, causing damage to the goods. More seriously, in the case of emergency braking, the rapid fall of the goods may cause safety accidents. Summary of the invention

[0004] In order to improve the above situation, the present invention provides a lifting overspeed slow-down anti-skid brake that provides a small crane overspeed slow-down anti-skid brake that detects the running speed of the wire rope in real time through an infrared wire rope speed sensor, transmits a signal through a signal line, rotates the main gear to make the rack slide up and down, drives the large gear to rotate, and extends the brake rod toward the wire rope, and penetrates into the wire rope through a friction cone to lock the wire rope to reduce the speed.

[0005] The invention discloses a crane overspeed slow-down anti-skid brake, which is realized as follows: the crane overspeed slow-down anti-skid brake is composed of an overspeed slow-down brake fixing frame, an infrared wire rope speed sensor, a motor support, a motor, a signal line, a main gear, a sliding rib, a rack, a sliding groove, a large gear, a large gear fixing plate, a fixing screw, a wire rope sliding groove, a wire rope, an arc sliding groove, a sliding hole, a brake rod, a reset spring, a wire joint, a rectangular protrusion, a rectangular parallelepiped friction cone, an oblique cylindrical protrusion and an oblique cylindrical friction cone. The infrared wire rope speed sensor is fixed on one side of the overspeed slow-down brake fixing frame. The overspeed slow-down brake fixing frame is provided with a hole. The transmitter and receiver of the infrared wire rope speed sensor are both directed through the central axis of the hole of the overspeed slow-down brake fixing frame. The motor support is fixed on one side of the overspeed slow-down brake fixing frame. The motor is fixed on the motor support. One end of the signal line is connected to the infrared wire rope speed sensor, and the other end of the signal line is connected to the motor. The main gear axle passes through the overspeed slow-down brake fixing frame and is connected to the motor shaft of the motor, and a supporting bearing is arranged between the main gear axle and the overspeed slow-down brake fixing frame. The sliding rib is fixed on the other side of the overspeed slow-down brake fixing frame. Preferably, the cross section of the sliding rib is T-shaped, and the sliding rib is composed of a vertical plate and a horizontal plate. The rack is provided with a sliding groove, and the rack is connected by sliding through the sliding groove and the sliding rib. The rack has gear teeth on both sides, one side gear teeth mesh with the main gear, and the other side gear teeth mesh with the large gear. A circular sliding groove is provided on the other side of the overspeed descent brake fixing frame, and the sliding groove and the hole on the overspeed descent brake fixing frame are coaxially arranged. A circular sliding rib is arranged on one side of the large gear, and the large gear is rotatably placed on the overspeed slow-down brake fixing frame through the circular sliding rib and the circular sliding groove, and is meshed with the rack. Preferably, the large gear is an incomplete gear. The large gear is provided with a wire rope connecting groove. The large gear fixing plate is fixed on the other side of the overspeed slow-down brake fixing frame by fixing screws, and is coaxially arranged with the hole on the overspeed slow-down brake fixing frame. The large gear fixing plate is provided with a wire rope connecting groove. Preferably, the outer annular surface diameter of the large gear fixing plate from the side in contact with the overspeeding and descending brake fixing frame to two-thirds is smaller than the outer annular surface diameter from two-thirds to the other side, and the inner annular surface diameter of the large gear fixing plate is the same as the hole diameter of the overspeeding and descending brake fixing frame. The disc-shaped rocker fixing disc is provided with a wire rope sliding groove. The wire rope passes through the center of the wire rope sliding groove. The large gear is provided with an arc groove, which is in an arc-shaped structure. Preferably, the angle between the straight end of the circular arc slide and the edge of the large gear fixed plate is an acute angle, a plurality of the circular arc slides are provided, and the plurality of circular slides are arranged equidistantly along the circumference of the large gear, the circular arc slide is connected to the wire rope connecting groove, and the circular arc slide passes through the large gear. The large gear fixing plate is provided with a sliding hole. Preferably, the sliding holes and the arc sliding grooves are the same in number and are connected one by one. The cross section of the sliding hole is a rectangular structure. The cross section diameter of the sliding hole from one end intersecting with the outer ring surface of the large gear rod fixing plate to four fifths is larger than the cross section diameter to the other end. The brake rod slides and is slidably connected with the sliding hole in the large gear fixed plate. Preferably, the cross-sectional diameter from one end to three-quarters of the brake rod is slightly smaller than the cross-sectional diameter from four-fifths to the other end of the hole, and the cross-sectional diameter from three-quarters to the other end of the brake rod is slightly smaller than the cross-sectional diameter from one end to four-fifths of the hole. The end of the brake rod placed in the arc chute is in an arc-shaped structure, and the brake rod and the arc chute correspond one to one. The other end of the brake rod passes through the corresponding sliding hole and extends into the wire rope sliding groove. Preferably, the extension lines of the other ends of the plurality of brake rods intersect at the center of the wire rope sliding groove, that is, aligned with the wire rope, Preferably, the surface of the brake rod from one end to the half is smooth. One end of the return spring is fixedly connected to the annular surface at three-quarters of the brake rod, and the other end is fixedly connected to the annular surface at four-fifths of the sliding hole. The return spring surrounds the outer side of the smaller diameter part of the brake rod. One end of the wire connector is fixed on the brake rod, and the diameter of the wire connector is slightly larger than the diameter of one end of the brake rod. The cylindrical protrusion is fixed at the other end of the wire connector. Preferably, the cylindrical protrusions are arranged in groups, each group of the cylindrical protrusions corresponds to the wire joints one by one, and each group of the cylindrical protrusions is provided with a plurality of cylindrical protrusions, and the plurality of cylindrical protrusions are arranged equidistantly along the circumference of the wire joint. One end of the rectangular protrusion is fixed on the wire connector. Preferably, the rectangular protrusions are provided in multiple groups, each group of the rectangular protrusions corresponds to the wire joint one by one, and each group of the rectangular protrusions is provided with multiple rectangular protrusions, and the multiple rectangular protrusions are arranged equidistantly along the circumference of the wire joint, and the rectangular protrusions and cylindrical protrusions are arranged alternately. The cuboid friction cone is fixed at the other end of the rectangular protrusion. Preferably, each of the rectangular protrusions corresponds to a plurality of rectangular friction cones, and the plurality of rectangular friction cones are arranged equidistantly along the length direction of the rectangular protrusion. One end of the oblique cylindrical protrusion is fixed on the cylindrical protrusion, and the plane of the other end of the oblique cylindrical protrusion and the top surface of the wire joint are inclined, and the oblique cylindrical protrusion corresponds to the cylindrical protrusion one by one. The oblique cylindrical friction cone is fixed on the other end of the oblique cylindrical protrusion. Preferably, each oblique cylindrical protrusion corresponds to a plurality of oblique cylindrical friction cones, and the plurality of oblique cylindrical friction cones are evenly distributed on the top surface of the oblique cylindrical protrusion. Preferably, the motor circuit board is provided with a signal converter, a data processor and a controller. The signal converter can receive the signal of the infrared wire rope speed sensor through the signal line and perform signal conversion. The data processor and the signal converter exchange information. The data processor receives the infrared wire rope speed sensor signal transmitted by the signal converter, performs data processing, and compares the processed value with the preset value in the data processor. The controller and the data processor exchange information. When the value obtained by the data processor deviates from the preset value, the controller executes the instruction issued by the data processor to control the start and stop of the motor. Furthermore, a twist groove is provided on the side surface from one end to three-quarters of the brake rod, and the twist groove is spirally wound around the side surface of the brake rod. Furthermore, the gear teeth on the large gear are replaced with involute gear teeth, and the tooth profile shape of the gear teeth on the large gear is involute.

[0006] The present invention also relates to a lifting overspeed slow-down brake, which is composed of an overspeed slow-down brake fixing frame, an infrared wire rope speed sensor, a motor support, a motor, a signal line, a crank, a connecting rod, a disc-shaped rocker fixing plate, a fixing bolt, a wire rope sliding groove, a wire rope, a disc-shaped rocker, a U-shaped sliding groove, a U-shaped sliding block and a spring. The infrared wire rope speed sensor is fixed on one side of the overspeed slow-down brake fixing frame. The overspeed slow-down brake fixing frame is provided with a hole. The transmitter and receiver of the infrared wire rope speed sensor are both directed through the central axis of the hole of the overspeed slow-down brake fixing frame. The motor support is fixed on one side of the overspeed slow-down brake fixing frame. The motor is fixed on the motor support. One end of the signal line is connected to the infrared wire rope speed sensor, and the other end of the signal line is connected to the motor circuit board. A connecting shaft is fixed on the side surface of one end of the crank, and the connecting shaft passes through the overspeed slow-down brake fixing frame and is connected to the motor shaft of the motor, and a supporting bearing is arranged between the connecting shaft and the overspeed slow-down brake fixing frame. One end of the connecting rod is connected to the other end of the crank by a rotating shaft. The disc-shaped rocker fixing plate is fixed on the other side of the overspeed slow-down brake fixing frame by fixing bolts, and is coaxially arranged with the hole on the overspeed slow-down brake fixing frame. Preferably, the outer annular surface diameter of the disc-shaped rocker fixing plate from the side in contact with the overspeeding and descending brake fixing frame to two-thirds is greater than the outer annular surface diameter from two-thirds to the other side, and the inner annular surface diameter of the disc-shaped rocker fixing plate is the same as the hole diameter of the overspeeding and descending brake fixing frame. The disc-shaped rocker fixing disc is provided with a wire rope sliding groove. The wire rope passes through the center of the wire rope sliding groove. The disc rocker is placed between the disc rocker fixing plate and the overspeed slow-down brake fixing frame. The disc rocker is a circular ring structure. The inner ring surface of the disc rocker is rotatably connected to the disc rocker fixing plate. The outer ring surface is connected to a long strip structure. One end of the long strip structure is connected to the outer ring surface of the disc rocker, and the other end is rotatably connected to the other end of the connecting rod through a rotating shaft. There is an inclined U-shaped slide groove on the disc rocker. Preferably, the oblique U-shaped chute is in the shape of an elongated strip, the angle between the center line of the oblique U-shaped chute and the edge of the fixed plate of the disc-shaped rocker is an acute angle, a plurality of oblique U-shaped chute are provided, the plurality of oblique U-shaped chute are equally spaced along the circumference of the disc-shaped rocker, and the oblique U-shaped chute runs through the disc-shaped rocker. The disc-shaped rocker fixing disc is provided with a slide groove. Preferably, the number of the slide grooves and the oblique U-shaped slide grooves is the same and they are connected one by one. The cross section of the slide groove is a rectangular structure. The cross section diameter of the slide groove from one end intersecting with the outer ring surface of the disc-shaped rocker fixing plate to four fifths is greater than the cross section diameter to the other end. The U-shaped slider and the disc-shaped rocker are connected by sliding in the inner groove of the fixed disc. Preferably, the cross-sectional diameter from one end to one-half of the U-shaped slider is slightly smaller than or equal to the cross-sectional diameter from one end to four-fifths of the slideway, and the cross-sectional diameter from one-half of the U-shaped slider to the other end is slightly smaller than or equal to the cross-sectional diameter from four-fifths of the slideway to the other end. The end of the U-shaped slider placed in the inclined U-shaped slideway is in an arc-shaped structure, and the U-shaped slider corresponds to the inclined U-shaped slideway one by one. The other end of the U-shaped slider passes through the corresponding U-shaped slide groove and extends into the wire rope slide groove. Preferably, the extension lines of the other ends of the plurality of U-shaped sliding blocks intersect at the center of the wire rope sliding groove, that is, aligned with the wire rope, Preferably, the surface of the U-shaped slider is smooth from one end to the half. Preferably, the other end surface of the U-shaped slider is provided with friction lines. Preferably, when the other ends of the plurality of U-shaped sliders are in contact with the wire rope, the side surfaces of two adjacent U-shaped sliders are not in contact. One end of the spring is fixedly connected to the U-shaped slider, and the other end is fixedly connected to the hole in the disc-shaped rocker fixing plate. The spring surrounds the outside of the smaller diameter part of the U-shaped slider. Preferably, the motor circuit board is provided with a signal converter, a data processor and a controller. The signal converter can receive the signal of the infrared wire rope speed sensor through the signal line and perform signal conversion. The data processor and the signal converter exchange information. The data processor receives the infrared wire rope speed sensor signal transmitted by the signal converter, performs data processing, and compares the processed value with the preset value in the data processor. The controller and the data processor exchange information. When the value obtained by the data processor deviates from the preset value, the controller executes the instruction issued by the data processor to control the start and stop of the motor. Furthermore, a virtual constraint crank is rotatably connected on the overspeed slow-descent brake fixing frame, and the other end of the virtual constraint crank is rotatably connected via a rotating shaft and a connecting rod, and the virtual constraint crank is arranged in parallel with the crank. Furthermore, an anti-sliding block is fixedly mounted on the other end of the disc-shaped rocker, and the cross-sectional diameter of the anti-sliding block gradually increases from one end connected to the U-shaped slider to the other end. The other end of the anti-sliding block is in an arc-shaped structure, and the arc fits the arc of the wire rope. The anti-sliding block corresponds to the U-shaped slider one by one, and the anti-sliding block is made of rubber. Beneficial Effects

[0007] 1. It can brake automatically and quickly, effectively preventing the load from falling out of control, reducing the possibility of accidents and significantly improving the safety of operations.

[0008] Second, preventive protection measures can reduce equipment damage and downtime caused by accidents, effectively reducing maintenance and repair costs.

[0009] 3. Automatically slow down or stop in case of overspeed, reducing the wear on crane components and extending the service life of the equipment.

[0010] 4. No manual operation is required, the response speed is fast, which can reduce the workload of operators and avoid the risk of accidents caused by human operational errors.

[0011] 5. The surface in contact with the wire rope is equipped with multiple friction cones to prevent the device from slipping during operation and improve safety.

[0012] 6. The arc slide structure is easy to process, which reduces production costs.

[0013] 7. The internal structure is sealed, which saves maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional structural diagram of a crane overspeed slow-descent brake of the present invention; Figure 2 This is a structural schematic diagram of a crane overspeed slow-descent brake according to the present invention; Figure 3 It is a partial enlarged view of a crane overspeed slow-descent brake of the present invention; Figure 4 It is a three-dimensional structural diagram of a crane overspeed slow-descent brake of the present invention; Figure 5 It is a three-dimensional structural diagram of a second embodiment of a crane overspeed slow-descent brake of the present invention; Figure 6 It is a three-dimensional structural diagram of a third embodiment of a crane overspeed slow-descent brake of the present invention; Figure 7 It is a three-dimensional structural diagram of a crane overspeed slow-down anti-skid brake of the present invention; Figure 8 It is a structural schematic diagram of a crane overspeed slow descent anti-skid brake of the present invention; Fig. 9 This is a structural schematic diagram of a crane overspeed slow-down anti-skid brake of the present invention, which only shows the structure of the brake rod; Fig.10 This is a three-dimensional structural diagram of a crane overspeed slow-down anti-skid brake of the present invention, which only shows the structure of the components on one end of the brake rod; Fig.11 This is a three-dimensional structural diagram of a second embodiment of a crane overspeed slow-down anti-skid brake of the present invention, which only shows the structure of the brake rod; Fig.12 This is a structural schematic diagram of Example 3 of a crane overspeed slow descent anti-skid brake according to the present invention. Attached photos

[0015] The components include: an overspeed slow-down brake fixing frame (1), an inclined U-shaped slide groove (2), a motor support (3), a motor (4), a crank (5), a connecting rod (6), a disk-shaped rocker (7), a U-shaped slider (8), a disk-shaped rocker fixing plate (9), a fixing bolt (10), a wire rope sliding groove (11), a wire rope (12), a signal line (13), an infrared wire rope speed sensor (14), a spring (15), a virtual constraint crank (16), an anti-sliding block (17), a main gear (18), a rack ( 19), large gear (20), large gear fixing plate (21), fixing screw (22), wire rope connecting groove (23), sliding rib (24), sliding groove (25), arc sliding groove (26), sliding hole (27), brake rod (28), return spring (29), wire joint (30), cylindrical protrusion (31), rectangular protrusion (32), oblique cylindrical protrusion (33), rectangular friction cone (34), oblique cylindrical friction cone (35), twist groove (36), involute gear tooth (37) DETAILED DESCRIPTION Example 1

[0016] The invention discloses a crane overspeed slow-down anti-skid brake, which comprises an overspeed slow-down brake fixing frame (1), an infrared wire rope speed sensor (14), a motor support (3), a motor (4), a signal line (13), a main gear (18), a sliding rib (24), a rack (19), a sliding groove (25), a large gear (20), a large gear fixing plate (21), a fixing screw (22), a wire rope sliding groove (11), a wire rope (12), an arc sliding groove (26), a sliding hole (27), a brake rod (28), a reset spring (29), a wire joint (30), a rectangular protrusion, a rectangular parallelepiped friction cone (34), an oblique cylindrical protrusion (33) and an oblique cylindrical friction cone (35). The infrared wire rope speed sensor (14) is fixedly placed on one side of the overspeed slow-down brake fixing frame (1). The overspeed slow-down brake fixing frame (1) is provided with a hole. The transmitter and receiver of the infrared steel wire rope speed sensor (14) are both directed through the central axis of the hole of the overspeed slow-down brake fixing frame (1). The motor support (3) is fixedly placed on one side of the overspeed slow-down brake fixing frame (1). The motor (4) is fixedly placed on the motor support (3). One end of the signal line (13) is connected to the infrared wire rope speed sensor (14), and the other end of the signal line (13) is connected to the motor (4). The axle of the main gear (18) passes through the overspeed slow-down brake fixing frame (1) and is connected to the motor shaft of the motor (4), and a supporting bearing is arranged between the main gear (18) and the overspeed slow-down brake fixing frame (1). The sliding rib (24) is fixedly placed on the other side of the overspeed slow-down brake fixing frame (1). Preferably, the sliding rib (24) has a T-shaped cross-section, and the sliding rib (24) is composed of a vertical plate and a horizontal plate. The rack (19) is provided with a sliding groove (25), and the rack (19) is slidably connected via the sliding groove (25) and the sliding rib (24). The rack (19) has gear teeth on both sides, the gear teeth on one side meshing with the main gear (18), and the gear teeth on the other side meshing with the large gear (20). A circular sliding groove is formed on the other side of the overspeed descent brake fixing frame (1), and the sliding groove and the hole on the overspeed descent brake fixing frame (1) are coaxially arranged. A circular sliding rib is disposed on one side of the large gear (20), and the large gear (20) is rotatably disposed on the overspeeding and slow-down brake fixing frame (1) through the circular sliding rib cooperating with the circular sliding groove, and is meshed with the rack (19). Preferably, the large gear (20) is an incomplete gear. The large gear (20) is provided with a wire rope connecting groove (23). The large gear fixing plate (21) is fixed on the other side of the overspeed slow-down brake fixing frame (1) by fixing screws (22) and is coaxially arranged with the hole on the overspeed slow-down brake fixing frame (1). The large gear fixing plate (21) is provided with a wire rope connecting groove (23). Preferably, the diameter of the outer annular surface of the large gear fixing plate (21) from the side in contact with the overspeeding and descending brake fixing frame (1) to two-thirds is smaller than the diameter of the outer annular surface from two-thirds to the other side, and the diameter of the other side of the large gear fixing plate (21) is the same as the diameter of the hole of the overspeeding and descending brake fixing frame (1). The disk-shaped rocker fixing disk (9) is provided with a wire rope sliding groove (11). The wire rope (12) passes through the center of the wire rope sliding groove (11). The large gear (20) is provided with an arcuate groove (26), and the arcuate groove (26) is in an arc-shaped structure. Preferably, the angle between the straight end of the circular arc slide groove (26) and the edge of the large gear fixing plate (21) is an acute angle, a plurality of the circular arc slide grooves (26) are provided, and the plurality of circular slide grooves are arranged equidistantly along the circumference of the large gear (20), the circular slide grooves are connected to the wire rope connecting groove (23), and the circular arc slide groove (26) passes through the large gear fixing plate (21). The large gear fixing plate (21) is provided with a sliding hole (27). Preferably, the sliding holes (27) and the circular arc sliding grooves (26) are of the same number and are connected in a one-to-one correspondence. The cross section of the sliding hole (27) is a rectangular structure. The cross section diameter of the sliding hole (27) from one end intersecting with the outer ring surface of the rod fixing plate of the large gear (20) to four fifths is greater than the cross section diameter to the other end. The brake rod (28) is slidably connected to the sliding hole (27) in the large gear fixing plate (21). Preferably, the cross-sectional diameter from one end to three-quarters of the brake rod (28) is slightly smaller than the cross-sectional diameter from four-fifths to the other end of the hole, and the cross-sectional diameter from three-quarters to the other end of the brake rod (28) is slightly smaller than the cross-sectional diameter from one end to four-fifths of the hole. The end of the brake rod (28) placed in the circular arc slide groove (26) has an arc-shaped structure, and the brake rod (28) and the circular arc slide groove (26) correspond one to one. The other end of the brake rod (28) passes through the corresponding sliding hole (27) and extends into the wire rope sliding groove (11). Preferably, the extension lines of the other ends of the plurality of brake rods (28) intersect at the center of the wire rope sliding groove (11), that is, aligned with the wire rope (12). Preferably, the surface of the brake rod (28) from one end to the half thereof is smooth. One end of the return spring (29) is fixedly connected to the three-quarters annular surface of the brake rod (28), and the other end is fixedly connected to the four-fifths annular surface of the sliding hole (27). The return spring (29) surrounds the outer side of the smaller diameter portion of the brake rod (28). One end of the wire connector (30) is fixedly placed on the brake rod (28), and the diameter of the wire connector (30) is slightly larger than the diameter of one end of the brake rod (28). The cylindrical protrusion (31) is fixedly placed on the other end of the wire connector (30). Preferably, the cylindrical protrusions (31) are provided in groups, each group of the cylindrical protrusions (31) corresponds to the wire joint (30) one by one, and each group of the cylindrical protrusions (31) is provided with a plurality of cylindrical protrusions (31), and the plurality of cylindrical protrusions (31) are arranged equidistantly along the circumference of the wire joint (30). One end of the rectangular protrusion is fixedly placed on the wire connector (30). Preferably, the rectangular protrusions are provided in a plurality of groups, each group of the rectangular protrusions corresponds to the wire joint (30) one by one, and each group of the rectangular protrusions is provided with a plurality of them, and the plurality of the rectangular protrusions are arranged equidistantly along the circumference of the wire joint (30), and the rectangular protrusions and the cylindrical protrusions (31) are arranged alternately. The cuboid friction cone (34) is fixedly placed at the other end of the rectangular protrusion. Preferably, each of the rectangular protrusions corresponds to a plurality of rectangular friction cones (34), and the plurality of rectangular friction cones (34) are arranged at equal distances along the length direction of the rectangular protrusion. One end of the oblique cylindrical protrusion (33) is fixedly placed on the cylindrical protrusion (31), and the plane of the other end of the oblique cylindrical protrusion (33) and the top surface of the wire joint (30) are arranged obliquely, and the oblique cylindrical protrusion (33) and the cylindrical protrusion (31) correspond one to one. The oblique cylindrical friction cone (35) is fixedly placed on the other end of the oblique cylindrical protrusion (33). Preferably, each oblique cylindrical protrusion (33) corresponds to a plurality of oblique cylindrical friction cones (35), and the plurality of oblique cylindrical friction cones (35) are evenly distributed on the top surface of the oblique cylindrical protrusion (33). Preferably, a signal converter, a data processor and a controller are provided on the circuit board of the motor (4). The signal converter can receive the signal from the infrared wire rope speed sensor (14) through the signal line (13) and perform signal conversion. The data processor and the signal converter exchange information. The data processor receives the infrared wire rope speed sensor (14) signal transmitted by the signal converter, performs data processing, and compares the processed value with a preset value in the data processor. The controller and the data processor exchange information. When the value obtained by the data processor deviates from the preset value, the controller executes the instruction issued by the data processor to control the start and stop of the motor. When in use, the bottom surface of the overspeed slow-down brake fixing frame (1) is fixed on the crane hanger by welding or other means, and the position is between the pulley block and the drum. The wire rope (12) passes through the hole on the overspeed slow-down brake fixing frame (1). The infrared wire rope speed sensor (14) detects the movement data of the wire rope (12) in real time, monitors the speed of the wire rope (12), and sends the data to the motor (4) circuit board through the signal line (13). The signal converter on the motor (4) circuit board receives and converts the signal. The data processor processes the signal and compares it with the preset value. If the detected speed exceeds the preset value, the data processor sends an instruction to the controller. The controller starts the motor (4) according to the instruction. The start of the motor (4) drives the main gear (18) to rotate, thereby driving the rack (19) to slide up and down, and then drives the large gear (20) to rotate through the meshing between the gear teeth. In this process, the brake rod (28) is squeezed in the arc slide groove (26). The plurality of brake rods (28) are moved under pressure, so that the plurality of brake rods (28) extend toward the central axis direction of the large gear fixed plate (21). During this process, the rectangular friction cone and the oblique cylindrical friction cone (35) are in contact with the surface of the wire rope (12). The conical protrusion is designed to be self-locking. When the force direction of the wire rope (12) remains unchanged, the wire rope (12) can be reliably locked to reduce its sliding speed. Moreover, since the contact area between the conical protrusion and the wire rope (12) is large and the protrusion can penetrate deep into the wire rope (12), the wire rope (12) can be locked. The brake rod (28) is provided with a brake element (14) and a brake rod (28) which is provided with a brake element (14) and a brake rod (28) which is provided with a brake element (14) and a brake rod (28) which is provided with a brake element (14) and a brake rod (28) which is provided with a brake element (14) and a brake rod (28) which is provided with a brake element (28 ... Example 2

[0017] The difference between this embodiment and the first embodiment is that a twist groove (36) is formed on the side surface of the brake rod (28) from one end to three-quarters thereof, and the twist groove (36) is spirally wound around the side surface of the brake rod (28). When in use, the twist groove (36) helps to distribute the bearing force more evenly, avoids the force being concentrated on a certain point, and thus reduces damage or deformation caused by excessive concentration. Example 3

[0018] The difference between this embodiment and embodiment 1 is that the gear teeth on the large gear (20) are replaced with involute gear teeth (37), and the gear teeth on the large gear (20) have an involute tooth profile. When in use, the involute tooth profile can avoid heel cutting, making the movement smoother and reducing vibration and noise. The rack (19) is provided with a sliding groove (25) which cooperates with the sliding rib (24) to be slidably placed on the overspeeding and slow-down brake fixing frame (1), so that the rack (19) can slide in a fixed direction, thereby ensuring stable operation of the entire device; The cooperation between the main gear (18), the rack (19) and the large gear (20) drives the entire device to clamp the wire rope (12), so that the entire device can withstand a greater load and has higher durability; The design of placing the return spring (29) between the brake rod (28) and the sliding hole (27) enables the spring (15) to push the brake rod (28) back to its original position after the brake rod (28) has completed the braking action on the steel wire rope (12), thereby breaking away from the contact with the steel wire rope (12), thereby preventing the steel wire rope (12) from being in contact with the brake rod (28) and the structure above it for a long time during operation. Such continuous contact may cause damage to the steel wire rope (12). At the same time, long-term contact may cause wear to the friction cone above the brake rod (28), thereby affecting the braking effect; The design that the diameter of the other side surface of the large gear fixing plate (21) is slightly smaller than the diameter of the outer ring surface of the large gear (20) can prevent dust from entering the interior of the circular arc slide groove (26), thereby avoiding operational obstructions caused by dust accumulation, which not only improves the performance stability of the equipment but also effectively saves maintenance costs; The brake rod (28) is provided with a plurality of cylindrical protrusions (31) and a rectangular parallelepiped protrusion (32), which can prevent one end of the brake rod (28) from bending during emergency braking; The brake rod (28) is provided with a friction cone, which can increase the contact area between the brake rod and the steel wire rope (12), and the friction cone can penetrate deeply into the steel wire rope (12) to prevent slipping during braking; The purpose is to detect the running speed of the steel wire rope (12) in real time through the infrared steel wire rope speed sensor (14), transmit the signal through the signal line (13), rotate the main gear (18) so that the rack (19) slides up and down, drives the large gear (20) to rotate, and thus the brake rod (28) extends toward the steel wire rope (12), and the friction cone penetrates into the steel wire rope (12) to lock the steel wire rope (12) and reduce the speed.

[0019] The invention discloses a crane overspeed slow-down brake, which is realized as follows: the crane overspeed slow-down brake comprises an overspeed slow-down brake fixing frame (1), an infrared steel wire rope speed sensor (14), a motor support (3), a motor (4), a signal line (13), a crank (5), a connecting rod (6), a disk-shaped rocker fixing plate (9), a fixing bolt (10), a steel wire rope sliding groove (11), a steel wire rope (12), a disk-shaped rocker (7), a U-shaped sliding groove, a U-shaped sliding block (8) and a spring (15). The infrared wire rope speed sensor (14) is fixedly placed on one side of the overspeed slow-down brake fixing frame (1). The overspeed slow-down brake fixing frame (1) is provided with a hole. The transmitter and receiver of the infrared steel wire rope speed sensor (14) are both directed through the central axis of the hole of the overspeed slow-down brake fixing frame (1). The motor support (3) is fixedly placed on one side of the overspeed slow-down brake fixing frame (1). The motor (4) is fixedly placed on the motor support (3). One end of the signal line (13) is connected to the infrared wire rope speed sensor (14), and the other end of the signal line (13) is connected to the circuit board of the motor (4). A connecting shaft is fixedly disposed on the side surface of one end of the crank (5), the connecting shaft passes through the overspeed slow-down brake fixing frame (1) and is connected to the motor shaft of the electric motor (4), and a supporting bearing is disposed between the connecting shaft and the overspeed slow-down brake fixing frame (1). One end of the connecting rod (6) is rotatably connected to the other end of the crank (5) via a rotating shaft. The disc-shaped rocker fixing plate (9) is fixed on the other side of the overspeed slow-down brake fixing frame (1) by means of fixing bolts (10), and is coaxially arranged with the hole on the overspeed slow-down brake fixing frame (1). Preferably, the outer annular surface diameter of the disc-shaped rocker fixing plate (9) from the side in contact with the overspeeding and descending brake fixing frame (1) to two-thirds is greater than the outer annular surface diameter from two-thirds to the other side, and the inner annular surface diameter of the disc-shaped rocker fixing plate (9) is the same as the hole diameter of the overspeeding and descending brake fixing frame (1). The disk-shaped rocker fixing disk (9) is provided with a wire rope sliding groove (11). The wire rope (12) passes through the center of the wire rope sliding groove (11). The disc-shaped rocker (7) is disposed between the disc-shaped rocker fixing plate (9) and the overspeed slow-down brake fixing frame (1); the disc-shaped rocker (7) is a circular ring structure; the inner ring surface of the disc-shaped rocker (7) is rotatably connected to the disc-shaped rocker fixing plate (9); the outer ring surface is connected to a long strip structure; one end of the long strip structure is connected to the outer ring surface of the disc-shaped rocker (7); the other end is rotatably connected to the other end of the connecting rod (6) via a rotating shaft; The disc-shaped rocker (7) is provided with an oblique U-shaped slide groove (2). Preferably, the oblique U-shaped slide groove (2) is in the form of an elongated strip, the angle between the center line of the oblique U-shaped slide groove (2) and the edge of the disc-shaped rocker fixing plate (9) is an acute angle, a plurality of oblique U-shaped slide grooves (2) are provided, the plurality of oblique U-shaped slide grooves (2) are equidistantly distributed along the circumference of the disc-shaped rocker (7), and the oblique U-shaped slide grooves (2) penetrate the disc-shaped rocker (7). The disc-shaped rocker fixing disc (9) is provided with a slide groove. Preferably, the number of the slide grooves and the oblique U-shaped slide grooves (2) is the same and they are connected one by one. The cross section of the slide groove is a rectangular structure. The cross section diameter of the slide groove from one end intersecting with the outer annular surface of the disc-shaped rocker fixing plate (9) to four fifths is greater than the cross section diameter to the other end. The U-shaped slider (8) is slidably connected to the inner groove of the disc-shaped rocker fixing plate (9). Preferably, the cross-sectional diameter from one end to one half of the U-shaped slider (8) is slightly smaller than or equal to the cross-sectional diameter from one end to four fifths of the slideway, and the cross-sectional diameter from one half of the U-shaped slider (8) to the other end is slightly smaller than or equal to the cross-sectional diameter from four fifths of the slideway to the other end. One end of the U-shaped slider (8) placed in the inclined U-shaped slideway (2) is in an arc-shaped structure, and the U-shaped slider (8) corresponds to the inclined U-shaped slideway (2) one by one. The other end of the U-shaped sliding block (8) passes through the corresponding U-shaped sliding groove and extends into the wire rope sliding groove (11). Preferably, the extension lines of the other ends of the plurality of U-shaped sliding blocks (8) intersect at the center of the wire rope sliding groove (11), that is, aligned with the wire rope (12). Preferably, the surface of the U-shaped slider (8) is smooth from one end to the half. Preferably, the other end surface of the U-shaped slider (8) is provided with friction grooves. Preferably, when the other ends of the plurality of U-shaped sliders (8) are in contact with the steel wire rope (12), the side surfaces of two adjacent U-shaped sliders (8) do not contact each other. One end of the spring (15) is fixedly connected to the U-shaped slider (8), and the other end is fixedly connected to the inner hole of the disc-shaped rocker fixing plate (9). The spring (15) surrounds the outer side of the smaller diameter portion of the U-shaped slider (8). Preferably, a signal converter, a data processor and a controller are provided on the circuit board of the motor (4). The signal converter is capable of receiving a signal from an infrared wire rope speed sensor (14) via a signal line (13) and performing signal conversion; The data processor and the signal converter exchange information. The data processor receives the infrared wire rope speed sensor (14) signal transmitted by the signal converter, performs data processing, and compares the processed value with a preset value in the data processor. The controller and the data processor exchange information. When the value obtained by the data processor deviates from the preset value, the controller executes the instruction issued by the data processor to control the start and stop of the motor. When in use, the bottom surface of the overspeed slow-down brake fixing frame (1) is fixed on the crane hanger by welding or other means, and the position is between the pulley block and the drum. The wire rope (12) passes through the hole on the overspeed slow-down brake fixing frame (1). The infrared wire rope speed sensor (14) detects the movement data of the wire rope (12) in real time, monitors the speed of the wire rope (12), and sends the data to the motor (4) circuit board through the signal line (13). The signal converter on the motor (4) circuit board receives and converts the signal. The data processor processes the signal and compares it with the preset value. If the detected speed exceeds the preset value, the data processor will send an instruction to the controller. The controller starts the motor (4) according to the instruction. The start of the motor (4) drives the crank (5 ) rotates, thereby pulling the connecting rod (6), so that the disk-shaped rocker (7) rotates around the central axis of the disk-shaped rocker fixing plate (9) by a certain angle. During this process, the U-shaped slider (8) moves under the squeezing action of the inclined U-shaped slide groove (2), so that multiple U-shaped sliders (8) extend toward the center direction of the disk-shaped rocker fixing plate (9), thereby clamping the wire rope (12) and reducing the moving speed of the wire rope (12). When the infrared wire speed sensor detects that the speed of the wire rope (12) is within a preset value, the motor (4) will rotate in the reverse direction, and the disk-shaped rocker (7) will be pushed to rotate in the reverse direction through the crank (5) and the connecting rod (6). At this time, under the elastic force of the spring (15), the U-shaped slider (8) will be reset to the initial position, releasing the wire rope (12) and allowing it to operate normally; Example 2

[0020] The difference between this embodiment and embodiment 1 is that a virtual constraint crank (16) is rotatably connected to the overspeed slow-descent brake fixing frame (1), and the other end of the virtual constraint crank (16) is rotatably connected to the connecting rod (6) via a rotating shaft. The virtual constraint crank (16) and the crank (5) are arranged in parallel. When in use, the crank (5) is subjected to a greater force. The virtual constraint crank (16) can enhance the rigidity of the mechanism and improve the load-bearing capacity, thereby ensuring the reliability and durability of the mechanism during long-term operation or under extreme load conditions. Example 3

[0021] The difference between this embodiment and the first embodiment is that an anti-sliding block (17) is fixedly mounted on the other end of the disc-shaped rocker (7), and the cross-sectional diameter of the anti-sliding block (17) gradually increases from one end connected to the U-shaped sliding block (8) to the other end. The other end of the anti-sliding block (17) is in an arc-shaped structure, and the arc fits the arc of the steel wire rope (12). The anti-sliding block (17) and the U-shaped sliding block (8) correspond one to one. When in use, the contact area between the anti-sliding block (17) and the steel wire rope (12) is larger and the arc fits the surface of the steel wire rope (12) more closely. The material of the anti-sliding block (17) can increase the friction force on the steel wire rope (12). The increased contact area and optimized arc fit ensure a more uniform and more effective pressure distribution between the anti-sliding block (17) and the steel wire rope (12), thereby effectively reducing the possibility of sliding and displacement. The infrared wire rope speed sensor (14) is fixedly placed on a side surface of the overspeed descent brake fixing frame (1). The design of the transmitter and receiver of the infrared wire rope speed sensor (14) both passing through the central axis of the hole of the overspeed descent brake fixing frame (1) can stabilize the sensor position, avoid sensor displacement caused by vibration or movement, ensure the consistency and reliability of measurement in the long term, and ensure that the transmitter and receiver are accurately aligned, so as to maximize the transmission and reception efficiency of infrared rays, thereby accurately measuring the speed of the wire rope (12); The infrared wire rope speed sensor (14) is connected to the motor (4) circuit board via a signal line (13), and the data of the infrared wire rope speed sensor (14) is sent to the motor (4) circuit board via the signal line (13). The signal converter on the motor (4) circuit board receives and converts the signal, and the data processor processes the signal and compares it with a preset value. If the detected speed exceeds the preset value, the data processor sends an instruction to the controller, and the controller starts the motor (4) according to the instruction. The design can quickly respond to the situation when the speed exceeds the preset value, thereby reducing potential dangers. At the same time, no human intervention is required, thereby improving the intelligence level of the system, reducing errors and accidents that may be caused by improper human operation, and improving the reliability of the operation. The design in which one end of the spring (15) is fixedly connected to the U-shaped slider (8) and the other end is fixedly connected to the inner hole of the disc-shaped rocker fixing plate (9) can utilize the elasticity of the spring (15) to automatically reset the U-shaped slider (8) after the slow-descent braking operation is completed, thereby reducing the reliance on complex electronic control systems, thereby simplifying the overall control mechanism and reducing the complexity and cost of the system; The inclined U-shaped slide groove (2) is provided with a plurality of inclined U-shaped slide grooves (2), which are equidistantly distributed along the circumference of the disk-shaped rocker (7), and the U-shaped slider (8) is slidably connected to the slide groove inside the disk-shaped rocker fixing plate (9). One end of the U-shaped slider (8) placed in the inclined U-shaped slide groove (2) is in an arc-shaped structure. The one-to-one correspondence between the U-shaped slider (8) and the inclined U-shaped slide groove (2) enables the U-shaped slider (8) to be driven at the same time during operation to achieve synchronous extension. Each U-shaped slider (8) can move toward the surface of the steel wire rope (12) at the same speed and pressure, thereby achieving uniform clamping of the steel wire rope (12), which helps to maintain the stability of the entire system; The purpose is to detect the running speed of the steel wire rope (12) in real time through the infrared steel wire rope speed sensor (14), transmit the signal through the signal line (13), and drive the disc-shaped rocker (7) to rotate through the motor so that the U-shaped slider (8) extends out to clamp the steel wire rope (12) to reduce the speed.

[0022] It should be noted that, unless otherwise clearly specified and limited, the terms "placed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection method such as a folding connection, a rivet connection, a pin connection, a bonding connection and a welding connection, or a detachable connection method such as a threaded connection, a snap connection and a hinge connection, or an integral connection, or an electrical connection, or a direct connection, or an indirect connection through an intermediate medium, or the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A crane overspeed slow-down anti-skid brake, characterized by: The invention is composed of an overspeeding and slowing brake fixing frame, an infrared wire rope speed sensor, a motor support, a motor, a signal line, a main gear, a sliding rib, a rack, a sliding groove, a large gear, a large gear fixing plate, a fixing screw, a wire rope sliding groove, a wire rope, an arc sliding groove, a sliding hole, a brake rod, a reset spring, a wire joint, a rectangular protrusion, a rectangular friction cone, an oblique cylindrical protrusion and an oblique cylindrical friction cone. The infrared wire rope speed sensor is fixedly placed on one side of the overspeeding and slowing brake fixing frame, the overspeeding and slowing brake fixing frame is provided with a hole, the motor support is fixedly placed on one side of the overspeeding and slowing brake fixing frame, the motor is fixedly placed on the motor support, one end of the signal line and the infrared wire rope are fixedly placed on the infrared wire rope. The rope speed sensor is connected, the other end of the signal line is connected to the motor, the main gear axle passes through the overspeed slow-descent brake fixing frame and is connected to the motor shaft of the motor, and a supporting bearing is arranged between the main gear axle and the overspeed slow-descent brake fixing frame, the sliding rib is fixed on the other side of the overspeed slow-descent brake fixing frame, a sliding groove is arranged on the rack, the rack is slidably connected through the sliding groove and the sliding rib, gear teeth are arranged on both sides of the rack, the gear teeth on one side are meshed with the main gear, and the gear teeth on the other side are meshed with the large gear, a circular sliding groove is arranged on the other side of the overspeed slow-descent brake fixing frame, the sliding groove and the hole on the overspeed slow-descent brake fixing frame are coaxially arranged, and a circular shaped sliding rib, the large gear is rotatably placed on the overspeeding and descending brake fixing frame through the circular sliding rib and the circular sliding groove, and meshes with the rack, the large gear is provided with a wire rope connecting groove, the large gear fixing plate is fixed on the other side of the overspeeding and descending brake fixing frame by fixing screws, and is coaxially arranged with the hole on the overspeeding and descending brake fixing frame, the large gear fixing plate is provided with a wire rope connecting groove, the disc-shaped rocker fixing plate is provided with a wire rope sliding groove, the wire rope passes through the center of the wire rope sliding groove, the large gear is provided with an arc sliding groove, the large gear fixing plate is provided with a sliding hole, the brake rod slides and is slidably connected with the sliding hole in the large gear fixing plate, the brake The other end of the rod passes through the corresponding sliding hole and extends into the wire rope sliding groove. One end of the return spring is fixedly connected to the circular surface at three-quarters of the brake rod, and the other end is fixedly connected to the circular surface at four-fifths of the sliding hole. One end of the wire joint is fixedly placed on the brake rod, and the diameter of the wire joint is slightly larger than the diameter of one end of the brake rod. The cylindrical protrusion is fixedly placed on the other end of the wire joint, one end of the rectangular protrusion is fixedly placed on the wire joint, a rectangular friction cone is fixedly placed on the other end of the rectangular protrusion, one end of the oblique cylindrical protrusion is fixedly placed on the cylindrical protrusion, the plane of the other end of the oblique cylindrical protrusion is inclined to the top surface of the wire joint, the oblique cylindrical protrusion and the cylindrical protrusion correspond one-to-one, and the oblique cylindrical friction cone is fixedly placed on the other end of the oblique cylindrical protrusion.

2. The anti-skid brake for overspeeding and slow descent of a crane according to claim 1 is characterized in that A twist groove is provided on the side surface from one end to three-quarters of the brake rod, and the twist groove is spirally wound around the side surface of the brake rod.

3. The anti-skid brake for overspeeding and slow descent of a crane according to claim 1 is characterized in that The gear teeth on the large gear are replaced with involute gear teeth, and the tooth profile shape of the gear teeth on the large gear is involute.

4. The anti-skid brake for overspeeding and slow descent of a crane according to claim 1 is characterized in that The transmitter and receiver directions of the infrared steel wire rope speed sensor both pass through the central axis of the hole of the overspeed slow-down brake fixing frame. The cross section of the sliding rib is a T-shaped structure, and the sliding rib is composed of a vertical plate and a horizontal plate.

5. The anti-skid brake for overspeeding and slow descent of crane according to claim 1 is characterized in that The large gear is an incomplete gear. The outer ring surface diameter of the large gear fixing plate from the side in contact with the overspeed descent brake fixing frame to two-thirds is smaller than the outer ring surface diameter from two-thirds to the other side. The inner ring surface diameter of the large gear fixing plate is the same as the hole diameter of the overspeed descent brake fixing frame.

6. The anti-skid brake for overspeeding and slow descent of a crane according to claim 1 is characterized in that The arc slide groove is in an arched structure, and the angle between the straight end of the arc slide groove and the edge of the large gear fixed plate is an acute angle. There are multiple arc slide grooves, and the multiple circular slide grooves are arranged equidistantly along the circumference of the large gear. The arc slide groove is connected to the wire rope connecting groove, and the arc slide groove runs through the large gear.

7. The anti-skid brake for overspeeding and slow descent of a crane according to claim 1 is characterized in that The sliding holes and circular arc grooves are the same in number and are connected one by one. The cross section of the sliding hole is a rectangular structure. The cross section diameter of the sliding hole from one end intersecting with the outer ring surface of the large gear rod fixing plate to four fifths is greater than the cross section diameter to the other end.

8. The anti-skid brake for overspeeding and slow descent of a crane according to claim 1, characterized in that The cross-sectional diameter from one end to three-quarters of the brake rod is slightly smaller than the cross-sectional diameter from four-fifths to the other end of the hole, and the cross-sectional diameter from three-quarters to the other end of the brake rod is slightly smaller than the cross-sectional diameter from one end to four-fifths of the hole. The end of the brake rod placed in the arc slide groove has an arc-shaped structure, and the brake rod and the arc slide groove correspond one-to-one. The surface of the brake rod from one end to one-half is smooth, and the extension lines of the other ends of multiple brake rods intersect at the center of the wire rope sliding groove, that is, aligned with the wire rope.

9. The anti-skid brake for overspeeding and slow descent of a crane according to claim 1, characterized in that The return spring surrounds the outside of the smaller diameter part of the brake rod, the cylindrical protrusions are provided in groups, each group of the cylindrical protrusions corresponds to the wire joint one-to-one, and there are multiple cylindrical protrusions in each group, and the multiple cylindrical protrusions are arranged equidistantly along the circumference of the wire joint. The rectangular protrusions are provided in multiple groups, each group of the rectangular protrusions corresponds to the wire joint one-to-one, and there are multiple rectangular protrusions in each group, and the multiple rectangular protrusions are arranged equidistantly along the circumference of the wire joint. The rectangular protrusions and cylindrical protrusions are arranged alternately, each of the rectangular protrusions corresponds to multiple rectangular friction cones, and the multiple rectangular friction cones are arranged equidistantly along the length direction of the rectangular protrusion, and each oblique cylindrical protrusion corresponds to multiple oblique cylindrical friction cones, and the multiple oblique cylindrical friction cones are evenly distributed on the top surface of the oblique cylindrical protrusion.

10. The crane overspeed slow-down anti-skid brake according to claim 1, characterized in that The motor circuit board is provided with a signal converter, a data processor and a controller. The signal converter can receive the signal of the infrared wire rope speed sensor through the signal line and perform signal conversion. The data processor and the signal converter exchange information. The data processor receives the infrared wire rope speed sensor signal transmitted by the signal converter, performs data processing, and compares the processed value with the preset value in the data processor. The controller and the data processor exchange information. When the value obtained by the data processor deviates from the preset value, the instruction issued by the data processor is executed to control the start and stop of the motor.

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