Intelligent braking system and braking method for portal crane

Abstract

The present invention discloses an intelligent braking system and braking method for a gantry crane, comprising: a base, a braking device, a power device, a torque sensor and a main control unit, wherein the braking device is installed on the base, the power device is installed on the base, the power device is connected to the braking device, the torque sensor is installed on the braking device, the output end of the torque sensor is electrically connected to the input end of the main control unit, the output end of the main control unit is electrically connected to the control end of the power device, the main control unit controls the operation of the power device, the power device drives the braking device to realize braking control, during parking braking, the torque sensor detects the parking force value of the braking device in real time and feeds it back to the main control unit, the main control unit determines whether the parking force reaches the rated value, and when it is detected that the parking force does not reach the rated value, the main control unit controls the power device to continue to operate to increase the parking force of the braking device until it reaches the rated value and stops.

Description

Technical Field

[0001] The present invention relates to the technical field of braking systems, and in particular to an intelligent braking system and a braking method for a portal crane. Background Art

[0002] With the vigorous development of my country's automated ports, port cranes are developing towards automation, remote control and intelligence. As a port equipment with complex spatial coupling motion, gantry cranes are also developing rapidly towards automation, which also brings new requirements for various braking systems. However, the existing braking system controls the parking force manually, which is not accurate enough and difficult to operate. In addition, the parking force may be reduced during operation due to equipment wear or external factors after parking, which poses a safety hazard and easily leads to personal and property losses. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes an intelligent braking system for a portal crane, which can solve the problems of the existing braking system that the control is not precise enough, the operation is complicated, and there are potential safety hazards.

[0004] According to the first aspect of the present invention, an intelligent braking system for a gantry crane includes: a base; a braking device, which is installed on the base; a power unit, which is installed on the base and connected to the braking device; a torque sensor, which is installed on the braking device for detecting the parking force value; and a main control unit, wherein the output end of the torque sensor is electrically connected to the input end of the main control unit, and the output end of the main control unit is electrically connected to the control end of the power unit for controlling the power unit.

[0005] The intelligent braking system for a gantry crane according to the first aspect of the embodiment of the present invention has at least the following technical effects: the embodiment of the present invention controls the operation of the power device through the main control unit, and the power device drives the braking device to realize braking control. During parking braking, the torque sensor detects the parking force value of the braking device in real time and feeds back to the main control unit. The main control unit determines whether the parking force reaches the rated value. When it is detected that the parking force does not reach the rated value, the main control unit controls the power device to continue to operate to increase the parking force of the braking device until it reaches the rated value and stops. Even when the equipment is worn or affected by external factors, the parking force can be kept constant at the rated value, thereby improving safety performance, eliminating the need for manual control, making the control more precise and intelligent, and making the operation more efficient.

[0006] According to some embodiments of the present invention, the braking device includes a first brake arm, a second brake arm, a brake wheel, a pull rod, a spring assembly and a triangular arm, the first brake arm and the second brake arm are arranged on the base at intervals, the bottom ends of the first brake arm and the second brake arm are respectively hinged to the base, the middle part of the first brake arm is hinged with a first brake shoe, the middle part of the second brake arm is hinged with a second brake shoe, the brake wheel is arranged between the first brake shoe and the second brake shoe for achieving braking by clamping, the top end of the first brake arm is hinged to one end of the pull rod, the other end of the pull rod is passed through the spring assembly and is threadedly connected to the spring assembly, the spring assembly is hinged to one end of the triangular arm, the top end of the second brake arm is hinged to the middle part of the triangular arm, and the other end of the triangular arm is hinged to a power device.

[0007] According to some embodiments of the present invention, the torque sensor is mounted on any one of the first brake shoe, the second brake shoe, the spring assembly and the pull rod.

[0008] According to some embodiments of the present invention, a uniform withdrawal device is further included, one end of the uniform withdrawal device is connected to the first brake arm, and the other end of the uniform withdrawal device is connected to the second brake arm.

[0009] According to some embodiments of the present invention, the power device includes a pusher and a return spring, the bottom of the pusher is hinged to the base, the top of the pusher is hinged to one end of the triangular arm, the output end of the main control unit is electrically connected to the control end of the pusher, one end of the return spring is hinged to the base, and the other end of the return spring is hinged to the middle part of the triangular arm.

[0010] According to some embodiments of the present invention, the power device also includes a motor, which is mounted on one end of the pull rod away from the spring assembly to control the rotation of the pull rod to adjust the distance between the first brake arm and the second brake arm, and the output end of the main control unit is electrically connected to the control end of the motor.

[0011] According to some embodiments of the present invention, a local control unit and a remote control unit are further included, wherein the output end of the local control unit is communicatively connected to the input end of the main control unit, and the output end of the remote control unit is communicatively connected to the input end of the main control unit.

[0012] According to some embodiments of the present invention, a position switch is further included on the base, and the position switch is electrically connected to the main control unit for determining the travel of the braking device.

[0013] A braking method of an intelligent braking system for a portal crane according to a second aspect of the present invention comprises the following steps:

[0014] S100, the local control unit or the remote control unit sends a start signal to the main control unit, the main control unit controls the motor to reverse, the brake system is released, and the crane rotates normally;

[0015] S200, the local control unit or the remote control unit sends a frequency signal to the main control unit, and the main control unit controls the operation of the pusher, changes the magnitude of the frequency signal, and the thrust of the pusher changes accordingly, so that the locking degree of the brake system changes. When it is detected that the frequency or parking force value of the pusher does not reach the set value, the main control unit determines that the pusher is faulty and enters the redundant braking mode;

[0016] S300, the local control unit or the remote control unit sends a stop signal to the main control unit, the main control unit controls the motor to rotate forward, the brake system is locked, and the crane is parked.

[0017] The braking method of the intelligent braking system for a gantry crane according to the second aspect of the embodiment of the present invention has at least the following technical effects: the embodiment of the present invention realizes parking control by driving the braking device through a power device. During parking braking, the torque sensor detects the parking force value of the braking device in real time and feeds back to the main control unit. The main control unit determines whether the parking force reaches the rated value. When it is detected that the parking force does not reach the rated value, the main control unit controls the power device to continue to operate to increase the parking force of the braking device until it reaches the rated value and stops. Even when the equipment is worn or affected by external factors, the parking force can be kept constant at the rated value, thereby improving safety performance, eliminating the need for manual adjustment, making control more precise and intelligent, and making operations more efficient.

[0018] According to some embodiments of the present invention, the redundant braking mode in step S200 includes the following steps:

[0019] S210, detecting whether the brake system is in a parking brake state. If not, the main control unit controls the motor to rotate forward, the brake system is locked, and the crane is parked;

[0020] S220, the remote control unit sends a zero position signal to control the motor to reverse, the brake system is released, and the crane rotates normally;

[0021] S230, the remote control unit sends a frequency signal to control the motor to rotate forward, and the brake system is locked. The magnitude of the frequency signal is changed to change the locking degree of the brake system.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0024] Figure 1 It is a structural schematic diagram A of the present invention;

[0025] Figure 2It is a structural schematic diagram B of the present invention;

[0026] Figure 3 It is a structural schematic diagram C of the present invention;

[0027] Figure 4 It is a structural schematic diagram D of the present invention;

[0028] Figure 5 is a functional diagram of the present invention;

[0029] Figure 6 It is a diagram of the release control steps of the present invention;

[0030] Figure 7 It is a redundant braking step diagram of the present invention;

[0031] Figure 8 It is a parking control step diagram of the present invention.

[0032] Reference numerals:

[0033] Base 100,

[0034] Braking device 200, first brake arm 210, first brake shoe 211, second brake arm 220, second brake shoe 221, brake wheel 230, pull rod 240, spring assembly 250, slider 251, loading spring 252, spring seat 253, triangular arm 260,

[0035] Power device 300, pusher 310, return spring 320, motor 330,

[0036] Torque sensor 400,

[0037] Main control unit 500,

[0038] The equal withdrawal device 600,

[0039] Local control unit 700, remote control unit 710,

[0040] Position switch 800,

[0041] Human-computer interaction module 900 , interlocking signal module 910 , and communication module 920 . DETAILED DESCRIPTION

[0042] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0043] In the description of the invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the invention.

[0044] In the description of the invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of the first or the second, it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0045] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0046] Reference below Figures 1 to 5 An intelligent braking system for a portal crane according to an embodiment of the first aspect of the present invention is described. The embodiment of the first aspect of the present invention includes the following four embodiments.

[0047] Example 1: Figure 1 and Figure 5 As shown, an intelligent braking system for a portal crane includes: a base 100, a braking device 200, a power device 300, a torque sensor 400 and a main control unit 500, the braking device 200 is installed on the base 100, the power device 300 is installed on the base 100, the power device 300 is connected to the braking device 200, the torque sensor 400 is installed on the braking device 200, the output end of the torque sensor 400 is electrically connected to the input end of the main control unit 500, the output end of the main control unit 500 is electrically connected to the control end of the power device 300, the main control unit 500 controls the operation of the power device 300, and the power device 300 drives the brake The device 200 realizes braking control. During parking braking, the torque sensor 400 detects the parking force value of the braking device 200 in real time and feeds back to the main control unit 500. The main control unit 500 determines whether the parking force reaches the rated value. When it is detected that the parking force does not reach the rated value, the main control unit 500 controls the power device 300 to continue to operate to increase the parking force of the braking device 200 until it reaches the rated value and stops. Even when the equipment is worn or affected by external factors, the parking force can be kept constant at the rated value, thereby improving safety performance, eliminating the need for manual adjustment, making control more precise and intelligent, and making operations more efficient. The main control unit 500 is a PLC, and a single-chip microcomputer chip can also be used.

[0048] like Figure 1 As shown, the brake device 200 includes a first brake arm 210, a second brake arm 220, a brake wheel 230, a pull rod 240, a spring assembly 250 and a triangular arm 260. The first brake arm 210 and the second brake arm 220 are arranged on the base 100 at intervals. The bottom ends of the first brake arm 210 and the second brake arm 220 are respectively hinged to the base 100. The middle part of the first brake arm 210 is hinged with a first brake shoe 211, and the middle part of the second brake arm 220 is hinged with a second brake shoe 221. The brake wheel 230 is arranged Between the first brake shoe 211 and the second brake shoe 221, the first brake shoe 211 and the second brake shoe 221 achieve braking by clamping the brake wheel 230, the top end of the first brake arm 210 is hinged to one end of the pull rod 240, the other end of the pull rod 240 is passed through the spring assembly 250 and is threadedly connected to the spring assembly 250, the spring assembly 250 is hinged to one end of the triangular arm 260, the top end of the second brake arm 220 is hinged to the middle part of the triangular arm 260, and the other end of the triangular arm 260 is hinged to the power device 300.

[0049] like Figure 1 As shown, the spring assembly 250 includes a slider 251, a loading spring 252 and a spring seat 253. One end of the pull rod 240 is inserted into the spring seat 253 and is threadedly connected to the spring seat 253. The slider 251 is sleeved on the spring seat 253. One end of the loading spring 252 is connected to the slider 251, and the other end of the loading spring 252 is connected to the spring seat 253. One end of the triangular arm 260 is hinged to the slider 251.

[0050] like Figure 1 As shown, the torque sensor 400 is installed on the first brake shoe 211 to accurately detect the value of the parking force.

[0051] like Figure 1 As shown, it also includes an equal retreat device 600, one end of which is connected to the first brake arm 210, and the other end of which is connected to the second brake arm 220. The equal retreat device 600 can make the first brake arm 210 and the second brake arm 220 move towards each other or move away from each other at the same time. The equal retreat device 600 makes the first brake arm 210 and the second brake arm 220 move evenly, thereby ensuring that the gaps between the first brake shoe 211 and the second brake shoe 221 and the brake wheel 230 are consistent.

[0052] like Figure 1As shown, the power device 300 includes a pusher 310 and a return spring 320. The bottom of the pusher 310 is hinged to the base 100, and the top of the pusher 310 is hinged to one end of the triangular arm 260. The output end of the main control unit 500 is electrically connected to the control end of the pusher 310. One end of the return spring 320 is hinged to the base 100, and the other end of the return spring 320 is hinged to the middle of the triangular arm 260. The pusher 310 pushes one end of the triangular arm 260 upward, and the other end of the triangular arm 260 is pressed downward. The return spring 320 is stretched as the triangular arm 260 moves, and the spring assembly 250 is forced to drive the pull rod 240 and the first brake The arm 210 and the first brake shoe 211 move to the right, and at the same time, the equalizing device 600 causes the second brake arm 220 and the second brake shoe 221 to move to the left, so that the first brake shoe 211 and the second brake shoe 221 press the brake wheel 230. When the pusher 310 stops working, the return spring 320 contracts, driving the triangular arm 260 and the pusher 310 to reset, and the pull rod 240, the first brake arm 210 and the first brake shoe 211 move to the left. At the same time, the equalizing device 600 causes the second brake arm 220 and the second brake shoe 221 to move to the right, so that the first brake shoe 211 and the second brake shoe 221 release the brake wheel 230.

[0053] like Figure 1 As shown, the power device 300 also includes a motor 330, which is sleeved on one end of the pull rod 240 away from the spring assembly 250. The motor 330 reverses and drives the pull rod 240 to reverse. When the pull rod 240 reverses, the spring assembly 250 is pushed to the right and drives the first brake arm 210 to move to the left. Under the action of the equal withdrawal device 600, the second brake arm 220 moves to the right, so that the first brake shoe 211 and the second brake shoe 221 release the brake wheel 230. The motor 330 rotates forward and drives the pull rod 240 to rotate forward. When the pull rod 240 rotates forward, the spring assembly 250 is pushed to the left and drives the first brake arm 210 to move to the right. Under the action of the equal withdrawal device 600, the second brake arm 220 moves to the left, so that the first brake shoe 211 and the second brake shoe 221 press the brake wheel 230. The main control unit 500 The output end is electrically connected to the control end of the motor 330 to control the operation of the motor 330. Frequent braking during operation will cause wear of the first brake shoe 211 and the second brake shoe 221, and the gap between the first brake shoe 211 and the second brake shoe 221 will increase. When the braking system performs parking control, no matter how the wear condition of the first brake shoe 211 and the second brake shoe 221 is, the control unit controls the motor 330 to stop running after the torque sensor 400 detects that the parking force reaches the rated value. When the braking system performs release control, time-limited control is adopted, that is, the running time of the motor 330 is fixed, and the movement distance of the pull rod 240 is fixed accordingly, so that the interval between the first brake shoe 211 and the second brake shoe 221 remains constant. The motor 330 is a DC motor, and can also use inductive and non-inductive BLDC motors, stepper motors, etc.

[0054] like Figure 5 As shown, it also includes a local control unit 700 and a remote control unit 710. The output end of the local control unit 700 is communicatively connected to the input end of the main control unit 500, and the output end of the remote control unit 710 is communicatively connected to the input end of the main control unit 500, so that remote control and local control can be performed. The local control unit 700 is a driver's cab, and a foot controller and a start-stop command module are arranged in the driver's cab, which has the functions of starting, controlling and stopping the braking system. The remote control unit 710 is a remote control room, and the remote control room is provided with a start-stop command module, a mode selection module, a rotation zero position module and a frequency command module. The frequency command module includes a host handle. The remote control room has the functions of starting and stopping the braking system, issuing frequency commands and adjusting the zero position. The remote control room also has a mode selection function. When the remote control room issues a local operation command through the mode selection module, the system enters the local operation mode, and when a remote operation command is issued, the system enters the remote operation mode. When the main control unit 500 detects that the pusher 310 fails, the system enters the redundant braking mode.

[0055] like Figure 1 As shown, it also includes a position switch 800 arranged on the base 100. The position switch 800 is electrically connected to the main control unit 500. The position switch 800 determines the stroke of the triangular arm 260. During parking control, if the torque sensor 400 fails, the parking force is set too large, the model specification selection is abnormal, etc., the main control unit 500 cannot accurately control the motor 330 to stop, and the triangular arm 260 continues to press down. After the position switch 800 is triggered, the main control unit 500 immediately stops the operation of the motor 330, thereby ensuring the safety of the equipment.

[0056] like Figure 1 and Figure 5 As shown, it also includes a human-machine interaction module 900, an interlocking signal module 910 and a communication module 920. The human-machine interaction module 900 is electrically connected to the main control unit 500. The human-machine interaction module 900 displays various working states and alarm information of the braking system in real time, and is used to set system-related parameters. The interlocking signal module 910 is electrically connected to the main control unit 500 to provide an interlocking feedback signal to the crane to ensure safe and reliable operation of the crane. The communication module 920 is electrically connected to the main control unit 500. The communication module 920 supports commonly used communication protocols such as PROFIBUS, PROFINET, CAN, etc., and provides the crane with system working status, alarm and other information in real time and receives various instructions issued by the crane.

[0057] Example 2: Figure 2 As shown, an intelligent braking system for a portal crane is provided, wherein a torque sensor 400 is installed on the second brake shoe 221 to accurately detect the value of the parking force, and the rest is the same as the above-mentioned embodiment 1.

[0058] Example 3: Figure 3 As shown, an intelligent braking system for a portal crane is provided, wherein a torque sensor 400 is installed between a loading spring 252 and a slider 251 to accurately detect the value of the parking force, and the rest is the same as the above-mentioned embodiment 1.

[0059] Example 4: Figure 4 As shown, an intelligent braking system for a portal crane is provided, wherein a torque sensor 400 is installed between a motor 330 and a pull rod 240 to accurately detect the value of the parking force, and the rest is the same as the above-mentioned embodiment 1.

[0060] Reference below Figures 6 to 8 A braking method of an intelligent braking system for a portal crane according to a second embodiment of the present invention is described.

[0061] A second aspect of the present invention provides a braking method for an intelligent braking system for a gantry crane, comprising a local operation mode, a remote operation mode and a redundant operation mode.

[0062] The local operation mode includes the following steps:

[0063] S100, brake system release control: start the start-stop command module in the driver's cab, the start-stop command module sends a start signal to the main control unit 500, the main control unit 500 controls the motor 330 to reverse, the brake system is released, and the crane rotates normally. The main control unit 500 controls the working time of the motor to ensure the size of the brake system opening gap;

[0064] S200, working control: by stepping on the foot controller in the driver's cabin, a frequency signal is sent to the main control unit 500, and the main control unit 500 controls the frequency output size of the frequency converter in the pusher. By changing the stroke of stepping on the foot controller in the driver's cabin, the size of the frequency signal is changed, and the stroke of the push rod of the pusher 310 pushing upward changes accordingly to change the locking degree of the brake system, so as to achieve the effect of variable force braking. When it is detected that the parking force value does not reach the rated value, the main control unit 500 determines that the pusher 310 is faulty and enters the redundant braking mode;

[0065] S300, parking control of the braking system: the start-stop command module in the driver's cab is turned off, the start-stop command module sends a stop signal to the main control unit 500, the main control unit 500 controls the motor 330 to rotate forward, detects that the parking force reaches the rated value, controls the motor to stop, and implements parking braking.

[0066] Remote operation mode includes the following steps:

[0067] S100, brake system release control: start the start-stop command module of the remote control room, the start-stop command module sends a start signal to the main control unit 500, the main control unit 500 controls the motor 330 to reverse, the brake system is released, and the crane rotates normally;

[0068] S200, work control: Push the host handle in the remote control room to send a frequency signal to the main control unit 500, the main control unit 500 controls the frequency output size of the frequency converter in the pusher, and changes the size of the frequency signal by changing the stroke of the host handle. The stroke of the push rod of the pusher 310 pushing upward changes accordingly to change the locking degree of the brake system, thereby realizing variable force braking. When it is detected that the parking force value does not reach the rated value, the main control unit 500 determines that the pusher 310 is faulty and automatically enters the redundant braking mode;

[0069] S300, parking control of the braking system: the start-stop command module in the driver's cab is turned off, the start-stop command module sends a stop signal to the main control unit 500, the main control unit 500 controls the motor 330 to rotate forward, detects that the parking force reaches the rated value, controls the motor to stop, and implements parking braking.

[0070] The redundant braking mode includes the following steps:

[0071] S210, detecting whether the brake system is in a parking brake state. If not, the main control unit 500 controls the motor 330 to rotate forward, the brake system is locked, and the crane is parked;

[0072] S220, the rotation zero position module of the remote control unit 710 sends a zero position signal to control the motor 330 to reverse, the brake system is released, and the crane rotates normally;

[0073] S230, pushing the host handle in the remote control room to send out a frequency signal to control the motor 330 to rotate forward, the brake system is locked, and the magnitude of the frequency signal is changed to change the locking degree of the brake system;

[0074] The main control unit 500 controls the operation of the power device 300, and the power device 300 drives the braking device 200 to realize braking control. During parking braking, the torque sensor 400 detects the parking force value of the braking device 200 in real time and feeds back to the main control unit 500. The main control unit 500 determines whether the parking force reaches the rated value. When it is detected that the parking force does not reach the rated value, the main control unit 500 controls the power device 300 to continue to operate to increase the parking force of the braking device 200 until it reaches the rated value and stops. Even when the equipment is worn or affected by external factors, the parking force can be kept constant at the rated value, thereby improving safety performance, eliminating the need for manual adjustment, making control more precise and intelligent, and making operations more efficient. When the pusher 310 fails, it can automatically enter the redundant braking mode, using the motor 330 to provide emergency backup braking, thereby improving the reliability of the crane and effectively ensuring the efficiency of port loading and unloading.

[0075] In summary, the intelligent braking system and braking method for a portal crane provided by the present invention controls the operation of the power device 300 through the main control unit 500, and the power device 300 drives the brake device 200 to realize braking control. During parking braking, the torque sensor 400 detects the parking force value of the brake device 200 in real time and feeds it back to the main control unit 500. The main control unit 500 determines whether the parking force reaches the rated value. When it is detected that the parking force does not reach the rated value, the main control unit 500 controls the power device 300 to continue to operate to increase the parking force of the brake device 200 until it reaches the rated value and stops. The parking force can be guaranteed even when the equipment is worn or affected by external factors. The vehicle force is constant at the rated value, the equalizing device 600 makes the first brake arm 210 and the second brake arm 220 move evenly, the local control unit 700 and the remote control unit 710 can perform remote control and local control, the position switch 800 ensures the safety of the equipment, the human-computer interaction module 900 displays various working states and alarm information of the braking system in real time, and is used to set system-related parameters, the interlocking signal module 910 is electrically connected to the main control unit 500, and provides an interlocking feedback signal to the crane to ensure the safe and reliable operation of the crane, and the communication module 920 provides the crane with real-time information such as the system working status and alarms and receives various instructions issued by the crane.

[0076] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. An intelligent braking system for a portal crane, characterized in that: include: base(100); A braking device (200), wherein the braking device (200) is mounted on the base (100); A power device (300), the power device (300) being mounted on the base (100), and the power device (300) being connected to the braking device (200); A torque sensor (400), the torque sensor (400) being mounted on the braking device (200) and used for detecting a parking force value; A main control unit (500), wherein the output end of the torque sensor (400) is electrically connected to the input end of the main control unit (500), and the output end of the main control unit (500) is electrically connected to the control end of the power device (300) for controlling the power device (300); the main control unit (500) is used to determine whether the parking force value reaches a rated value, and if the parking force value does not reach the rated value, the main control unit (500) controls the power device (300) to continue operating to increase the parking force of the brake device (200) until the parking force value reaches the rated value.

2. The intelligent braking system for a portal crane according to claim 1, characterized in that: The brake device (200) comprises a first brake arm (210), a second brake arm (220), a brake wheel (230), a pull rod (240), a spring assembly (250) and a triangular arm (260); the first brake arm (210) and the second brake arm (220) are arranged on the base (100) at intervals; the bottom ends of the first brake arm (210) and the second brake arm (220) are respectively hinged to the base (100); a first brake shoe (211) is hinged to the middle of the first brake arm (210); and a second brake shoe (221) is hinged to the middle of the second brake arm (220); The brake wheel (230) is arranged between the first brake shoe (211) and the second brake shoe (221) to achieve braking by clamping. The top end of the first brake arm (210) is hinged to one end of the pull rod (240), the other end of the pull rod (240) is passed through the spring assembly (250) and is threadedly connected to the spring assembly (250), the spring assembly (250) is hinged to one end of the triangular arm (260), the top end of the second brake arm (220) is hinged to the middle part of the triangular arm (260), and the other end of the triangular arm (260) is hinged to the power device (300).

3. The intelligent braking system for a portal crane according to claim 2, characterized in that: The torque sensor (400) is mounted on any one of the first brake shoe (211), the second brake shoe (221), the spring assembly (250) and the pull rod (240).

4. The intelligent braking system for a portal crane according to claim 2, characterized in that: It also comprises an evenly withdrawn device (600), one end of the evenly withdrawn device (600) being connected to the first brake arm (210), and the other end of the evenly withdrawn device (600) being connected to the second brake arm (220).

5. The intelligent braking system for a portal crane according to claim 2, characterized in that: The power device (300) comprises a pusher (310) and a return spring (320); the bottom of the pusher (310) is hinged to the base (100); the top of the pusher (310) is hinged to one end of the triangular arm (260); the output end of the main control unit (500) is electrically connected to the control end of the pusher (310); one end of the return spring (320) is hinged to the base (100); and the other end of the return spring (320) is hinged to the middle of the triangular arm (260).

6. The intelligent braking system for a portal crane according to claim 5, characterized in that: The power device (300) further comprises a motor (330), wherein the motor (330) is sleeved on one end of the pull rod (240) away from the spring assembly (250) and is used to control the rotation of the pull rod (240) to adjust the distance between the first brake arm (210) and the second brake arm (220), and the output end of the main control unit (500) is electrically connected to the control end of the motor (330).

7. The intelligent braking system for a portal crane according to claim 1, characterized in that: It also includes a local control unit (700) and a remote control unit (710), wherein the output end of the local control unit (700) is communicatively connected to the input end of the main control unit (500), and the output end of the remote control unit (710) is communicatively connected to the input end of the main control unit (500).

8. The intelligent braking system for a portal crane according to claim 1, characterized in that: It also includes a position switch (800) arranged on the base (100), wherein the position switch (800) is electrically connected to the main control unit (500) to determine the travel of the braking device (200).

9. A braking method for an intelligent braking system for a portal crane, characterized in that: The method applied to the intelligent braking system for a portal crane according to any one of claims 1 to 8 comprises the following steps: S100, the local control unit (700) or the remote control unit (710) sends a start signal to the main control unit (500), the main control unit (500) controls the motor (330) to reverse, the brake system is released, and the crane rotates normally; S200, the local control unit (700) or the remote control unit (710) sends a frequency signal to the main control unit (500), and the main control unit (500) controls the operation of the pusher (310), changes the magnitude of the frequency signal, and the thrust of the pusher (310) changes accordingly, so that the locking degree of the brake system changes. When it is detected that the frequency or parking force value of the pusher (310) does not reach the set value, the main control unit (500) determines that the pusher (310) is faulty and automatically enters a redundant braking mode; S300, the local control unit (700) or the remote control unit (710) sends a stop signal to the main control unit (500), and the main control unit (500) controls the motor (330) to rotate forward, the brake system is locked, and the crane is parked.

10. The braking method of the intelligent braking system for a portal crane according to claim 9, characterized in that: The redundant braking mode in step S200 includes the following steps: S210, detecting whether the brake system is in a parking brake state. If it is not in a parking brake state, the main control unit (500) controls the motor (330) to rotate forward, the brake system is locked, and the crane is parked; S220, the remote control unit (710) sends a zero position signal to control the motor (330) to reverse, the brake system is released, and the crane rotates normally; S230, the remote control unit (710) sends a frequency signal to control the motor (330) to rotate forward, and the brake system is locked. The magnitude of the frequency signal is changed to change the locking degree of the brake system.

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