Hoisting overspeed slow descent brake
Through infrared wire rope speed sensor and motor-driven disc rocker system, the speeding wire rope of small cranes is detected and braked in real time, solving the problem of insufficient real-time monitoring and rapid response in the existing technology, and achieving a safe, stable and efficient slow braking effect.
Patent Information
- Application Number
- CN202411904479.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-03-18
AI Technical Summary
The existing small crane slow-down brakes are difficult to achieve real-time monitoring and rapid response in overspeed situations, resulting in reduced wear, safety and stability of mechanical components, and prone to accidents.
The infrared wire rope speed sensor is used to detect the running speed of the wire rope in real time, transmit signals through the signal line, and use the motor to drive the disc rocker to rotate, so that the U-shaped slider extends out and jamms the wire rope to reduce the speed.
Automatic and rapid braking is achieved to prevent load from falling out of control, reduce the possibility of accidents, improve operational safety and equipment service life, and reduce maintenance costs.
Smart Images
Figure CN119637759A_ABST
Abstract
Description
Technical Field
[0001] The invention discloses a lifting overspeed slow-descent brake, which can slow-descent a small crane when the lifting object is overspeeding, and belongs to the technical field of crane slow-descent, and particularly relates to an overspeed slow-descent brake for a small crane, which detects the running speed of a wire rope in real time and transmits a signal through an infrared wire rope speed sensor, and drives a disc rocker to rotate through a motor so that a U-shaped slider extends out to clamp 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. Summary of the invention
[0003] In order to improve the above situation, the present invention provides a lifting overspeed slow-down brake for a small crane, which detects the running speed of the wire rope in real time through an infrared wire rope speed sensor, transmits the signal through a signal line, and drives the disc rocker to rotate through a motor so that a U-shaped slider extends out to clamp the wire rope to reduce the speed.
[0004] The invention discloses a crane overspeed slow-down brake, which is realized as follows: the crane overspeed slow-down 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 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
[0005] 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.
[0006] Second, preventive protection measures can reduce equipment damage and downtime caused by accidents, effectively reducing maintenance and repair costs.
[0007] 3. Automatically slow down or stop in case of overspeed, reducing the wear on crane components and extending the service life of the equipment.
[0008] 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. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] 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 Example 3 of a crane overspeed slow descent brake of the present invention. Attached photos
[0010] 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), and an anti-sliding block (17). DETAILED DESCRIPTION Example 1
[0011] 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 sends 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
[0012] 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
[0013] The difference between this embodiment and embodiment 1 is that an anti-sliding block (17) is fixedly mounted on the other end of the disc-shaped rocker (7), 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, the anti-sliding block (17) is made of rubber material, 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, and the material of the anti-sliding block (17) can increase the friction force on the steel wire rope (12), the increased contact area and the 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.
[0014] 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 brake, characterized by: The invention is composed of an overspeeding and descending brake fixing frame, an infrared steel wire rope speed sensor, a motor support, a motor, a signal line, a crank, a connecting rod, a disc rocker fixing plate, a fixing bolt, a steel wire rope sliding groove, a steel wire rope, a disc rocker, a U-shaped sliding groove, a U-shaped sliding block and a spring. The infrared steel wire rope speed sensor is fixedly placed on one side of the overspeeding and descending brake fixing frame, the overspeeding and descending brake fixing frame is provided with a hole, the motor support is fixedly placed on one side of the overspeeding and descending brake fixing frame, the motor is fixedly placed on the motor support, one end of the signal line is connected to the infrared steel wire rope speed sensor, the other end of the signal line is connected to the motor circuit board, a connecting shaft is fixedly placed on the side of one end of the crank, the connecting shaft passes through the overspeeding and descending brake fixing frame and is connected to the motor shaft of the motor, and is placed between the overspeeding and descending brake fixing frame. The U-shaped slider is slidably connected to the inner groove of the disc-type rocker arm fixed plate, and the other end of the U-shaped slider passes through the corresponding U-shaped slider and extends into the wire rope sliding groove. 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-type rocker arm fixed plate. The spring surrounds the outer side of the smaller diameter part of the U-shaped slider.
2. The crane overspeed slow-down brake according to claim 1 is characterized in that 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 through a rotating shaft and a connecting rod, and the virtual constraint crank is arranged in parallel with the crank.
3. The crane overspeed slow-down brake according to claim 1 is characterized in that An anti-sliding block is fixed on the other end of the disc-shaped rocker. 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.
4. The crane overspeed slow-down brake 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.
5. The crane overspeed slow-down brake according to claim 1 is characterized in that The outer annular surface diameter of the disc-shaped rocker arm fixing plate from the side in contact with the overspeed descent 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 arm fixing plate is the same as the diameter of the hole of the overspeed descent brake fixing frame.
6. The crane overspeed slow-down brake according to claim 1 is characterized in that The disk-shaped rocker is a circular ring structure, the inner ring surface of the disk-shaped rocker is rotatably connected to the disk-shaped rocker fixed 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 disk-shaped rocker, and the other end is rotatably connected to the other end of the connecting rod through a rotating shaft.
7. The crane overspeed slow-down brake according to claim 1 is characterized in that The inclined U-shaped slide groove is a long strip structure, and the angle between the center line of the inclined U-shaped slide groove and the edge of the disc-shaped rocker fixing plate is an acute angle. There are multiple inclined U-shaped slide grooves, and the multiple inclined U-shaped slide grooves are equidistantly distributed along the circumference of the disc-shaped rocker, and the inclined U-shaped slide groove runs through the disc-shaped rocker. The slide grooves and the inclined U-shaped slide grooves are the same in number and are connected one-to-one. The cross-section of the slide groove is a rectangular structure, and the cross-sectional diameter of the slide groove from one end intersecting with the outer annular surface of the disc-shaped rocker fixing plate to four-fifths is greater than the cross-sectional diameter to the other end.
8. The crane overspeed slow-down brake according to claim 1 is characterized in that 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 slide groove, 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 slide groove to the other end. The U-shaped slider has an arc-shaped structure at one end placed in the inclined U-shaped slide groove, and the U-shaped slider corresponds to the inclined U-shaped slide groove one by one. The extension lines of the other ends of the multiple U-shaped sliders intersect at the center of the wire rope sliding groove, that is, aligned with the wire rope.
9. The crane overspeed slow-down brake according to claim 8, characterized in that The surface of the U-shaped slider is smooth from one end to the half, and the other end of the U-shaped slider is provided with friction lines. When the other ends of the multiple U-shaped sliders are in contact with the wire rope, the side surfaces of two adjacent U-shaped sliders do not contact.
10. The crane overspeed slow-down 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.