Shovel overspeed protection method and system

Abstract

The application discloses a kind of shovel super-speed protection method and system, belong to mining machinery equipment field.The shovel super-speed protection method of the application, including obtaining the real-time vehicle speed of shovel;When vehicle speed exceeds the starting value of overspeed system, then cut off the power source of shovel;When vehicle speed exceeds the alarm value of overspeed system, send alarm;When vehicle speed exceeds the setting value of running brake, increase brake ratio;When vehicle speed exceeds the setting value of parking brake, parking electromagnetic valve starts.The real-time vehicle speed of shovel in the application is compared with the starting value of overspeed system, the alarm value of overspeed system, the setting value of running brake and the setting value of parking brake to make corresponding deceleration action, to limit the vehicle speed of shovel within reasonable range when shovel runs in long downhill.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mining machinery equipment, more particularly, to a shovel-truck overspeed protection method and system. BACKGROUND

[0002] The underground shovel-truck is a transportation device in the underground tunnel, and the working condition of the underground tunnel is various and complex, and long downhill is one of them. When the shovel-truck runs on the long downhill, the vehicle speed will continuously increase due to the self-weight of the shovel-truck. The gearbox will automatically shift up to adapt to the continuously increasing vehicle speed for protection of the gearbox. When the gearbox shifts to the highest gear, the vehicle speed is still increasing, and the gearbox cannot shift up for self-maintenance. At this time, the gearbox and the engine will be damaged to a certain extent, and the excessively high vehicle speed may also cause some safety problems.

[0003] In view of the above problems, the application creates a downhill automatic speed reducer for underground mine trackless equipment (Chinese patent application No. CN201921086237.0, application date: July 12, 2019). The application discloses a PLC control system and a throttle position sensor arranged in the cab, a speed sensor arranged near the vehicle transmission shaft, and an electromagnetic brake arranged on the rear frame. The starting relay of the electromagnetic brake and the gear relay are connected with the output end of the PLC control system, all the sensors are connected with the input end of the PLC control system, and the sensors and the PLC control system transmit data through CAN communication mode. When the PLC detects that the driver does not step on the accelerator, and the engine speed and the vehicle speed exceed a certain value, the controller sends a control signal to start the brake, and selects the corresponding relay according to the vehicle speed to realize the downhill speed reduction of the vehicle, realizes the automatic brake of the trackless equipment on the downhill, reduces the risk of brake failure, and has zero pollution to the environment.

[0004] In the above application, the speed reducer is set to realize the downhill speed reduction of the vehicle. However, in the actual process, when the vehicle speed is on the downhill, the vehicle will automatically accelerate under the driving of inertia. The sudden speed reduction of the brake will reduce the driving comfort of the driver, and the single brake cannot cope with the more complex underground mine. SUMMARY

[0005] 1. Technical problem to be solved by the application

[0006] The present application aims to overcome the shortcomings in the prior art, and provides a shovel-truck overspeed protection method. The real-time vehicle speed of the shovel-truck is compared with the set overspeed system starting value, overspeed system alarm value, driving brake setting value and parking brake setting value to make corresponding speed reduction actions, so as to limit the vehicle speed of the shovel-truck within a reasonable range when the shovel-truck runs on the long downhill.

[0007] 2. Technical solution

[0008] In order to achieve the above object, the technical solution provided by the present invention is:

[0009] A method for protecting a scraper from overspeed according to the present invention comprises:

[0010] Get the real-time speed of the scraper;

[0011] When the vehicle speed exceeds the overspeed system activation value, the scraper power source is cut off; when the vehicle speed is lower than the overspeed system failure setting value, the scraper power source is restored;

[0012] When the vehicle speed exceeds the overspeed system alarm value, the alarm will sound, and when the vehicle speed is lower than the overspeed system failure setting value, the alarm will stop;

[0013] When the vehicle speed exceeds the service brake setting value, the braking ratio is increased, and when the vehicle speed is lower than the overspeed system failure setting value, the braking ratio returns to normal;

[0014] When the vehicle speed exceeds the parking brake setting value, the parking solenoid valve is activated.

[0015] As a further improvement of the present invention, the method of cutting off the power source of the scraper when the vehicle speed exceeds the overspeed system activation value and restoring the power source of the scraper when the vehicle speed is lower than the overspeed system failure setting value includes:

[0016] When it is detected that the vehicle speed exceeds the start value set for the overspeed system, the engine controller disables the accelerator pedal and makes the engine run at idle speed; when the vehicle speed drops to the overspeed system disablement setting value, the accelerator pedal is reactivated.

[0017] As a further improvement of the present invention, the method of cutting off the power source of the scraper when the vehicle speed exceeds the overspeed system activation value and restoring the power source of the scraper when the vehicle speed is lower than the overspeed system failure setting value further includes:

[0018] When the vehicle speed exceeds the overspeed system activation value, if the engine is equipped with exhaust brake, the engine exhaust brake is activated; when the vehicle speed drops to the overspeed system failure setting value, the exhaust brake fails.

[0019] As a further improvement of the present invention, the method of sounding an alarm when the vehicle speed exceeds the overspeed system alarm value and stopping the alarm when the vehicle speed falls below the overspeed system failure setting value includes:

[0020] When the vehicle speed increases to the overspeed system alarm value set by the system, the display screen shows that the vehicle speed has exceeded the limit, prompting the operator to pay attention to the speed; when the vehicle speed drops to the overspeed system failure setting value, the display screen does not show that the vehicle speed is exceeding the limit.

[0021] As a further improvement of the present application, the method of issuing an alarm when the vehicle speed exceeds the overspeed system alarm value and stopping the alarm when the vehicle speed is below the overspeed system failure setting value further comprises:

[0022] When the vehicle speed increases to the system set overspeed system alarm value, the buzzer simultaneously starts the sound alarm to prompt the operator to pay attention to the vehicle speed; when the vehicle speed decreases to the overspeed system failure setting value, the buzzer closes the sound alarm.

[0023] As a further improvement of the present application, the method of increasing the brake ratio when the vehicle speed exceeds the driving brake setting value and restoring the normal brake ratio when the vehicle speed is below the overspeed system failure setting value comprises:

[0024] When the vehicle speed increases to the system set driving brake starting setting value, the brake solenoid valve proportionally increases the current value to gradually increase the brake ratio; when the vehicle speed decreases and falls to the overspeed system failure setting value, the brake solenoid valve loses power.

[0025] As a further improvement of the present application, the method of starting the parking brake solenoid valve when the vehicle speed exceeds the parking brake setting value comprises:

[0026] When the vehicle speed continues to increase to the system set parking brake setting value, the parking brake solenoid valve is automatically opened until the vehicle speed decreases to the overspeed system failure setting value.

[0027] As a further improvement of the present application, it further comprises that when the starting time of the driving brake has exceeded the system set maximum brake time, the parking brake solenoid valve is automatically opened until the vehicle speed decreases to the overspeed system failure setting value.

[0028] A system for overspeed protection of a scraper, comprising the above-mentioned method for overspeed protection of a scraper, further comprising,

[0029] a speed sensor module that detects the real-time speed of the scraper and generates a first signal;

[0030] a controller module that controls the vehicle speed of the scraper according to the first signal.

[0031] As a further improvement of the present application, it further comprises an engine control module that is electrically connected to the controller module, and the engine control module receives the second signal or the third signal sent by the controller module.

[0032] As a further improvement of the present application, it further comprises an alarm module that comprises a display screen unit and a buzzer unit, and the controller module sends the second signal or the third signal to the alarm module, and the alarm module controls the display screen unit and the buzzer unit to issue or close the alarm according to the second signal or the third signal.

[0033] As a further improvement of the present application, it further comprises a brake solenoid valve, which is electrically connected to the controller module, and the controller module controls the on / off of the brake solenoid valve.

[0034] As a further improvement of the present application, it further comprises a parking solenoid valve, which is electrically connected to the controller module, and the controller module controls the on / off of the parking solenoid valve.

[0035] 3. Beneficial effects

[0036] Compared with the prior art, the technical scheme provided by the present application has the following beneficial effects:

[0037] (1) In the present application, when the speed of the shovel exceeds the set overspeed system starting value when the shovel is going downhill, the overspeed system is started, the system automatically cuts off the power source of the shovel, so that the accelerator pedal is disabled, and if the engine is equipped with exhaust brake, the engine exhaust brake is started to reduce the speed.

[0038] (2) In the present application, when the speed increases to the system set overspeed system alarm value, the system sends an alarm, the display screen displays that the speed has exceeded, the buzzer starts to sound an alarm, prompting the operator to pay attention to the speed and take measures to limit the speed, so as to reduce the speed.

[0039] (3) In the present application, when the speed exceeds the set value of the service brake, the system reduces the speed by increasing the current value of the brake solenoid valve and increasing the brake ratio to ensure the safety of driving.

[0040] (4) In the present application, when the speed increases to the system set parking brake set value, the parking solenoid valve is started, the controller controls the starting of the parking solenoid valve, and then the speed is reduced to ensure the safety of driving. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 is a schematic diagram of an embodiment of the present application;

[0042] Figure 2 is a schematic diagram of time and speed of an embodiment of the present application;

[0043] Figure 3 is a logic block diagram of an embodiment of the present application;

[0044] Figure 4 is a circuit diagram of an embodiment of the present application.

[0045] Explanation of reference numerals in the schematic diagram:

[0046] 1, speed sensor module; 2, controller module; 3, engine control module; 4, accelerator pedal; 5, brake solenoid; 6, alarm module; 61, display screen unit; 62, buzzer unit; 7, parking solenoid. DETAILED DESCRIPTION

[0047] For a further understanding of the present application, reference will be made to the following detailed description of the application taken in conjunction with the accompanying drawings and examples.

[0048] The structure, proportion, size, etc. shown in the drawings of the present specification are only used to cooperate with the content disclosed in the specification, to be understood and read by those skilled in the art, and are not used to define the limiting conditions for the implementation of the present application, so they do not have technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "up", "down", "left", "right", "middle" and the like used in the present specification are only for the convenience of clear description, and are not used to limit the scope of implementation. The change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the implementation scope of the present application.

[0049] Example 1

[0050] The present application will be further described below in conjunction with examples. As Figures 1-3 , a method for over-speed protection of a scraper, comprising,

[0051] S1: obtaining the real-time vehicle speed of the scraper, the scraper being provided with a speed sensor on the wheel, the real-time vehicle speed of the scraper being measured by the speed sensor. When the vehicle speed of the scraper measured by the speed sensor is less than the over-speed system starting value, it is judged that the scraper is in a non-over-speed state, at which time the scraper is running normally. When the real-time vehicle speed is greater than the preset over-speed system starting value, it is judged that this time is an over-speed state.

[0052] Since the scraper running condition described in the present embodiment is located on a downhill section of a mine area, if the vehicle speed exceeds the system preset over-speed system starting value, without active intervention by the operator, the subsequent vehicle speed will most likely continue to increase, and the risk coefficient of the scraper running will continue to increase. Therefore, when the vehicle speed exceeds the over-speed system starting value, the over-speed system is automatically started.

[0053] S2: when the vehicle speed exceeds the overspeed system starting value, the power source of the shovel is cut off, and when the vehicle speed is lower than the overspeed system failure setting value, the power source of the shovel is restored. Cutting off the power source of the shovel, that is, limiting the power transmission of the shovel, the shovel may continue to move forward relying on inertia, or slow down under the action of ground resistance. Since the power source of the shovel is limited, that is, the acceleration operation of the operator on the shovel is limited, the judgment error of the operator on the vehicle speed is avoided to cause overspeed.

[0054] When the speed of the shovel is lower than the overspeed system failure value, the shovel is not overspeed, the cut-off power is restored, and the speed sensor continues to detect the real-time speed of the shovel.

[0055] Specifically, when the vehicle speed exceeds the overspeed system starting value, the power source of the shovel is cut off, and when the vehicle speed is lower than the overspeed system failure setting value, the power source of the shovel is restored. The method comprises the following steps:

[0056] S21: when it is detected that the vehicle speed of the shovel exceeds the starting value of the overspeed system, the engine controller deactivates the accelerator pedal, so that the engine runs at idle speed; and when the vehicle speed decreases to the overspeed system failure setting value, the accelerator pedal is reactivated. The deactivation of the accelerator pedal means that the power supply of the accelerator pedal is cut off, so that when the accelerator pedal is stepped on, the opening of the throttle is always in a closed state, effectively preventing the continuous increase of the vehicle speed due to the misstep of the operator.

[0057] S22: when the vehicle speed exceeds the overspeed system starting value, if the engine is equipped with exhaust brake, the engine exhaust brake is started; and when the vehicle speed decreases to the overspeed system failure setting value, the exhaust brake is deactivated. At this time, the engine is equivalent to an air compressor, which becomes a power consumption device. First, when the vehicle speed exceeds the overspeed system starting value, the exhaust brake is started, the oil injection nozzle stops injecting oil, but the engine still works and continuously inhales fresh air, and the butterfly valve installed in the exhaust system is closed to block the exhaust manifold, so that the pressure in the exhaust manifold reaches 4-6 atmospheres. At this time, the power source of the engine is the inertial force of the sliding shovel, rather than the energy generated by the combustion of the mixture, and the engine piston is compressing the high-pressure air in the exhaust pipe at this time, continuously consuming the kinetic energy of the vehicle running to achieve the purpose of slowing down the vehicle speed.

[0058] S3: when the vehicle speed exceeds the overspeed system alarm value, an alarm is issued, and when the vehicle speed is lower than the overspeed system failure setting value, the alarm is stopped; when the vehicle speed increases to exceed the overspeed system alarm value, the system automatically issues an alarm to remind the operator to pay attention to the vehicle speed, so that the operator can take active measures to slow down the shovel, including stepping on the brake and lowering the gear to slow down the shovel. When the operator actively takes the speed reduction measures,

[0059] S31: When the vehicle speed increases to the system set overspeed system alarm value, the display screen displays that the vehicle speed has exceeded the speed limit, prompting the operator to pay attention to the vehicle speed; when the vehicle speed decreases to the overspeed system failure set value, the display screen does not display that the vehicle speed has exceeded the speed limit. When the vehicle speed exceeds the system set alarm value, the display screen displays the current vehicle speed and has a speed limit exceeded prompt, preferably an easily visible prompt to the driver. When the driver takes certain measures and the vehicle speed decreases to the system set failure value, the display screen displays the normal driving required information.

[0060] S32: When the vehicle speed increases to the system set overspeed system alarm value, the buzzer simultaneously starts the sound alarm, prompting the operator to pay attention to the vehicle speed; when the vehicle speed decreases to the overspeed system failure set value, the buzzer stops the sound alarm. When the vehicle speed exceeds the system set alarm value, the display screen displays the overspeed information and the buzzer in the cab produces an alarm sound, reminding the driver that the vehicle is in an overspeed state and needs to actively step on the brake to slow down the vehicle. The double alarm reminder of the display screen and the buzzer ensures that the driver can definitely receive the reminder.

[0061] S4: When the vehicle speed exceeds the driving brake set value, the brake ratio is increased, and when the vehicle speed is lower than the overspeed system failure set value, the brake ratio returns to normal. Specifically, when the vehicle speed increases to the system set driving brake set value, the brake solenoid valve increases the current value in proportion, gradually increasing the brake ratio; when the vehicle speed decreases and decreases to the overspeed system failure set value, the brake solenoid valve loses power. In the system, there is a driving brake set value, when the vehicle speed exceeds the set value, the brake ratio is increased, that is, when the driver steps on with the same force, the increased brake force is greater than the unincreased brake force, and increasing the brake ratio is beneficial to the speed control of the scraper, and the driver can use smaller force to get longer brake effect. When the scraper is gradually slowed down to the overspeed system failure set value under the action of the driving brake, the brake solenoid valve loses power, and the brake returns to the normal driving state.

[0062] S5: When the vehicle speed exceeds the parking brake set value, the parking brake solenoid valve is started.

[0063] S51: When the vehicle speed continues to increase to the system set parking brake set value, the parking brake solenoid valve is automatically turned on until the vehicle speed decreases to the overspeed system failure set value. After the parking brake solenoid valve is powered on, the parking brake is started, the parking brake on the tire of the scraper directly forces the wheel to slow down, until the vehicle speed of the scraper decreases to the overspeed system failure set value, the parking brake solenoid valve fails, and the scraper returns to normal operation.

[0064] S52: When the starting time of the service brake has exceeded the maximum brake time set by the system, the parking electromagnetic valve is automatically opened until the vehicle speed is reduced to the overspeed system failure setting. When the service brake time exceeds the maximum brake time set by the system, the parking brake is automatically started to prevent the service brake from failing due to overheating and causing an accident.

[0065] Embodiment 2

[0066] As shown in FIG. 1, a system for overspeed protection of a shovel includes the method for overspeed protection of a shovel in Embodiment 1, and includes a speed sensor module 1 that detects the real-time speed of the shovel and generates a first signal; and a controller module 2 that controls the speed of the shovel according to the first signal. Figures 1-4 The first signal generated by the speed of the shovel measured by the speed sensor module 1 is a specific speed value, and the speed sensor module 1 transmits the first signal to the controller module 2 through a transmission unit. After receiving the first signal, the controller module 2 compares the speed value of the first signal with the overspeed system start value, the overspeed system alarm value, the service brake setting value, the parking brake setting value, and the overspeed system failure setting value set in its own database, and according to the comparison result, the controller module 2 sends a second signal or a third signal to control the speed of the shovel, wherein the second signal is a start signal; and the third signal is a signal to restore the shovel to the state before the overspeed system starts.

[0067] Specifically, when the speed shown by the first signal is greater than the overspeed system start value, the controller module 2 sends the second signal to the engine control module 3, and the engine control module 3 controls the power source of the shovel to be cut off, so as to prevent the shovel from continuing to accelerate; when the speed shown by the first signal is less than the overspeed system failure setting value, the controller module 2 sends the third signal to the engine control module 3, and at this time the shovel returns to normal operation.

[0068] Further, the system further includes an engine control module 3 electrically connected to the controller module 2, and the engine control module 3 receives the second signal or the third signal sent by the controller module 2. Specifically, when the engine control module 3 receives the second signal, the engine control module 3 controls the electromagnetic valve of the accelerator pedal 4 to be powered off, and at this time when the accelerator pedal 4 is stepped on, the opening of the accelerator is always in a closed state, effectively preventing the continuous increase of the vehicle speed due to the misoperation of the operator.

[0069]

[0070] ​When the speed shown by the first signal is less than the failure setting value of the overspeed system, the controller module 2 sends a third signal to the engine control module 3, at which time the shovel resumes normal operation. When the speed shown by the first signal is less than the failure setting value of the overspeed system, the controller module 2 sends a third signal to the engine control module 3, at which time the throttle of the shovel resumes normal operation.

[0071] Still further, an alarm module 6 is further included, the alarm module 6 including a display screen unit 61 and a buzzer unit 62, the controller module 2 sending a second signal or a third signal to the alarm module 6, the alarm module 6 controlling the display screen unit 61 and the buzzer unit 62 to sound or turn off an alarm according to the second signal or the third signal.

[0072] When the speed shown by the first signal is greater than the overspeed system warning value, the controller module 2 sends a second signal to the alarm module 6, the second signal being a start signal, the alarm module 6 turning on the alarm system after receiving the second signal, specifically, the display screen displaying that the speed has overshot, prompting the operator to pay attention to the speed, and the buzzer simultaneously sounding an alarm, prompting the operator to pay attention to the speed. When the driver voluntarily takes measures, the speed decreases until the speed shown by the first signal is less than the failure setting value of the overspeed system, the controller module 2 sending a third signal to the alarm module 6, the alarm system turning off the overspeed and the like on the display screen and simultaneously turning off the sound of the buzzer, at which time the shovel resumes normal operation.

[0073] Further, a brake solenoid valve 5 is further included, the brake solenoid valve 5 being electrically connected to the controller module 2, the controller module 2 controlling the brake solenoid valve 5 to turn on / off. A parking solenoid valve 7 is further included, the parking solenoid valve 7 being electrically connected to the controller module 2, the controller module 2 controlling the parking solenoid valve 7 to start / turn off.

[0074] When the speed shown by the first signal is greater than the driving brake setting value, the controller module 2 directly controls the brake ratio of the driving brake, the brake solenoid valve 5 increasing the current value in proportion, gradually increasing the brake ratio. When the shovel gradually slows down under the action of the driving brake to the failure setting value of the overspeed system, the brake solenoid valve 5 loses power, and the brake returns to the normal driving state.

[0075] When the speed continues to increase until the speed shown by the first signal is greater than the driving brake setting value, the parking solenoid valve 7 automatically turns on until the speed slows down to the failure setting value of the overspeed system, the parking solenoid valve 7 loses power, and the shovel returns to the normal driving state.

[0076] The above describes the present application and its embodiments in a schematic manner, and the description is not restrictive, and the embodiments shown in the drawings are only one of the embodiments of the present application, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by the above, without departing from the spirit of the present application, similar structural modes and embodiments can be designed without creativity, and all of them shall belong to the protection scope of the present application.

Claims

1. A method for protecting a scraper from overspeed, characterized by: include, Get the real-time speed of the scraper; When the vehicle speed exceeds the overspeed system activation value, the scraper power source is cut off; when the vehicle speed is lower than the overspeed system failure setting value, the scraper power source is restored; When the vehicle speed exceeds the overspeed system alarm value, the alarm will sound, and when the vehicle speed is lower than the overspeed system failure setting value, the alarm will stop; When the vehicle speed exceeds the service brake setting value, the braking ratio is increased, and when the vehicle speed is lower than the overspeed system failure setting value, the braking ratio returns to normal; When the vehicle speed exceeds the parking brake setting value, the parking solenoid valve is activated; The method of activating the parking solenoid valve when the vehicle speed exceeds the parking brake setting value includes: When the vehicle speed continues to increase to the parking brake setting value set by the system, the parking solenoid valve automatically opens until the vehicle speed drops to the overspeed system failure setting value; It also includes that when the activation time of the service brake has exceeded the maximum braking time set by the system, the parking solenoid valve will automatically open until the vehicle speed drops to the overspeed system failure setting value.

2. The overspeed protection method for a scraper according to claim 1, characterized in that: The method of cutting off the power source of the scraper when the vehicle speed exceeds the overspeed system activation value and restoring the power source of the scraper when the vehicle speed is lower than the overspeed system failure setting value includes: When it is detected that the vehicle speed exceeds the start value set by the overspeed system, the engine controller disables the accelerator pedal and makes the engine run at idle speed; When the vehicle speed drops to the overspeed system failure setting value, the accelerator pedal is reactivated.

3. The overspeed protection method for a scraper according to claim 2, characterized in that: The method of cutting off the power source of the scraper when the vehicle speed exceeds the overspeed system activation value and restoring the power source of the scraper when the vehicle speed is lower than the overspeed system failure setting value also includes: When the vehicle speed exceeds the overspeed system activation value, if the engine is equipped with exhaust brake, the engine exhaust brake is activated; When the vehicle speed drops to the overspeed system failure setting value, the exhaust brake fails.

4. The overspeed protection method for a scraper according to claim 1, characterized in that: The method of sounding an alarm when the vehicle speed exceeds the overspeed system alarm value and stopping the alarm when the vehicle speed falls below the overspeed system failure setting value includes: When the vehicle speed increases to the overspeed system alarm value set by the system, the display screen shows that the vehicle speed has exceeded the limit, prompting the operator to pay attention to the speed; when the vehicle speed drops to the overspeed system failure setting value, the display screen does not show that the vehicle speed is exceeding the limit.

5. The overspeed protection method for a scraper according to claim 4, characterized in that: The method of sounding an alarm when the vehicle speed exceeds the overspeed system alarm value and stopping the alarm when the vehicle speed falls below the overspeed system failure setting value further includes: When the vehicle speed increases to the overspeed system alarm value set by the system, the buzzer will start the sound alarm at the same time to remind the operator to pay attention to the vehicle speed; when the vehicle speed drops to the overspeed system failure setting value, the buzzer will stop the sound alarm.

6. The overspeed protection method for a scraper according to claim 1, characterized in that: The method of increasing the braking ratio when the vehicle speed exceeds the service brake setting value and restoring the braking ratio to normal when the vehicle speed is lower than the overspeed system failure setting value includes: When the vehicle speed increases to the set value set by the system to start the service brake, the brake solenoid valve increases the current value proportionally, gradually increasing the braking ratio; when the vehicle speed decreases and drops to the overspeed system failure set value, the brake solenoid valve loses power.

7. A scraper overspeed protection system, configured to implement the scraper overspeed protection method according to any one of claims 1 to 6, characterized in that: Also includes, a speed sensor module, the speed sensor module detecting a real-time speed of the scraper and generating a first signal; A controller module is provided for controlling a speed of the scraper according to the first signal.

8. The scraper overspeed protection system according to claim 7, characterized in that: It also includes an engine control module, which is electrically connected to the controller module and receives the second signal or the third signal sent by the controller module.

9. The scraper overspeed protection system according to claim 8, characterized in that: It also includes an alarm module, which includes a display screen unit and a buzzer unit. The controller module sends a second signal or a third signal to the alarm module, and the alarm module controls the display screen unit and the buzzer unit to issue or turn off the alarm according to the second signal or the third signal.

10. The scraper overspeed protection system according to claim 7, characterized in that: It also includes a brake solenoid valve, which is electrically connected to a controller module. The controller module controls the on / off power of the brake solenoid valve.

11. The scraper overspeed protection system according to claim 7, characterized in that: The system also includes a parking solenoid valve, which is electrically connected to a controller module. The controller module controls the activation / deactivation of the parking solenoid valve.

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