Automatic discharging control method and system for hopper of mechanical vehicle

Abstract

The invention relates to the technical field of automatic control, in particular to an automatic discharging control method and system for a hopper of a mechanical vehicle. The method comprises the following steps: system power-on initialization; a discharging instruction is obtained, a driving motor is started through a controller, and a hydraulic cylinder is driven to extend, so that a hopper is lifted; real-time data of the height sensor and the pressure sensor are obtained, and the controller is used for controlling the hydraulic rod to stretch out and draw back according to the sensing data; the discharging hook is driven by the connecting chain to rotate, so that the rear baffle is not limited, and discharging is achieved; and enabling the hopper to fall and return based on the falling control strategy by utilizing the controller. By receiving a discharging instruction, the driving motor, the hydraulic cylinder, the connecting chain, the discharging hook, the electromagnetic lock and other components are automatically controlled to work cooperatively. The whole discharging process from hopper lifting, rear baffle unlocking and discharging to hopper falling and returning does not need excessive manual intervention, the discharging frequency in unit time can be greatly increased, and the requirement for rapid material turnover of large-scale production operation is met.

Description

Technical Field

[0001] The present invention relates to the technical field of automatic control, and particularly relates to a method and system for automatically discharging materials from a mechanical vehicle hopper. Background Art

[0002] In many fields such as modern industrial production, construction, and logistics transportation, mechanical vehicles, as key tools for material handling, their discharging efficiency and safety play a crucial role in the smooth progress of the entire operation process and cost control.

[0003] Traditional mechanical vehicle discharging methods mostly rely on manual operation. For example, at a construction site, workers need to manually open the rear baffle of the hopper, wait for the materials to be discharged, and then manually close the rear baffle. The operation process is cumbersome and time-consuming. This not only increases labor costs, but also when there are various types of materials and large weights, the labor intensity of workers is extremely high, prone to fatigue and safety accidents. At the same time, the discharging speed of manual operation is difficult to match the modern large-scale and high-efficiency production rhythm, resulting in low overall operation efficiency.

[0004] In some scenarios with high requirements for discharging accuracy and stability, such as chemical raw material transportation and grain transfer, manual discharging cannot accurately control the discharging amount and the smoothness of the discharging process, easily causing waste or spillage of materials, which not only increases production costs, but may also cause environmental pollution.

[0005] In addition, with the rapid development of industrial automation technology, higher requirements are put forward for the intelligence and automation level of mechanical vehicle discharging systems in various industries. It is expected to achieve automatic control of the discharging process, reduce manual intervention, and improve the safety and reliability of operations. For example, in some dangerous material transportation scenarios, an automatic discharging system can avoid operators directly contacting dangerous materials and reduce safety risks. Moreover, an automated discharging system can be seamlessly docked with other production equipment to form an efficient automated production line, further improving production efficiency and enterprise competitiveness.

[0006] Just under such a background, it is extremely urgent to develop an efficient, intelligent, and safe method and system for automatically discharging materials from a mechanical vehicle hopper to meet the ever-developing needs of modern industrial production and logistics transportation and other fields. Summary of the Invention

[0007] To solve the above-mentioned problems, the present invention provides a method and system for automatically discharging materials from a mechanical vehicle hopper.

[0008] In a first aspect, the present invention provides a method for automatically discharging materials from a mechanical vehicle hopper, including:

[0009] Initializing the system power on;

[0010] Obtain the unloading instruction, start the drive motor through the controller, and drive the hydraulic cylinder to extend, so as to lift the hopper;

[0011] Obtain the real-time data of the height sensor and the pressure sensor, and use the controller to control the telescopic of the hydraulic rod according to the sensing data;

[0012] Drive the unloading hook to rotate by using the connecting chain, so that the rear baffle loses its limit, and realize unloading;

[0013] Use the controller to make the hopper fall back to its original position based on the descending control strategy.

[0014] Further, the power-on initialization of the system includes sending a short pulse signal to the drive motor through the controller to detect whether the drive motor responds; reading the initial values of the pressure sensor and the height sensor to determine whether they are within the set range; checking whether the electromagnetic lock is in the locked state, and checking whether the limit switch can be triggered normally.

[0015] Further, the step of starting the drive motor through the controller, driving the hydraulic cylinder to extend, and lifting the hopper includes generating a drive signal for controlling the drive motor through the STM32 series controller after receiving the unloading instruction and sending it to the drive motor through the H-bridge drive circuit. Among them, by different conduction combinations of four power transistors, the current direction of the motor is changed, so as to realize the forward rotation of the drive motor.

[0016] Further, the step of starting the drive motor through the controller, driving the hydraulic cylinder to extend, and lifting the hopper further includes generating pulse width modulation PWM signals with different duty cycles by using the controller according to the preset unloading strategy to adjust the speed of the motor. Among them, when the material weight is greater than the set threshold, in order to ensure the stable lifting of the hopper, the controller realizes the low-speed operation of the drive motor by reducing the duty cycle of the PWM signal.

[0017] Further, the step of obtaining the real-time data of the height sensor and the pressure sensor, and using the controller to control the telescopic of the hydraulic rod according to the sensing data includes obtaining the sensing data of the laser ranging type height sensor and the piezoresistive pressure sensor respectively. Among them, the laser ranging type height sensing data is connected to the controller through the SPI interface for master-slave communication, and the piezoresistive pressure sensing data is connected to the controller through the I 2 C bus, and the controller generates a hydraulic cylinder control strategy through a preset control algorithm to control the telescopic length of the hydraulic cylinder.

[0018] Further, the controller generates a hydraulic cylinder control strategy through a preset control algorithm to control the telescopic length of the hydraulic cylinder, including that the controller calculates the deviation between the actual measured value and the set value through the PID control algorithm to obtain a control quantity. Among them, in the proportional link, a control signal proportional to the deviation is generated according to the deviation magnitude to correspond to the deviation; the integral link integrates the deviation to eliminate the steady-state deviation of the system; the derivative link generates a control signal according to the change rate of the deviation to predict the change trend of the deviation, and by adjusting the parameters of the PID control algorithm, the telescopic control of the hydraulic cylinder reaches the optimal effect.

[0019] In a second aspect, a mechanical vehicle hopper automatic unloading control system provided by the present invention adopts the following technical solutions:

[0020] A mechanical vehicle hopper automatic unloading control system includes:

[0021] A hopper arranged on the vehicle frame for transporting materials, a discharge port is arranged at the bottom of the hopper, and an openable and closable rear baffle is installed at the discharge port;

[0022] A connecting chain is connected to the hopper, and the other end of the connecting chain is connected to a discharge hook;

[0023] The discharge hook is hinged on the vehicle frame, one end is connected to the connecting chain, and the other end limits the rear baffle.

[0024] Further, it further includes a hydraulic cylinder for lifting the hydraulic cylinder, and a pressure sensor is equipped on the hydraulic cylinder for real-time monitoring of the internal pressure of the hydraulic cylinder.

[0025] Further, it further includes a controller, the controller controls the driving motor through a driving circuit and a relay, and the driving motor controls the hydraulic cylinder.

[0026] Further, an electromagnetic lock is also installed on the rear baffle, and the electromagnetic lock locks the rear baffle.

[0027] To sum up, the present invention has the following beneficial technical effects:

[0028] The present invention automatically controls the coordinated work of components such as the driving motor, hydraulic cylinder, connecting chain, discharge hook, and electromagnetic lock by receiving a discharge instruction. From the hopper lifting, the rear baffle unlocking for discharging, to the hopper falling back into place, the entire discharging process requires little manual intervention, greatly shortening the discharging time. Compared with the traditional manual discharging method, it can significantly increase the number of discharging times per unit time and meet the demand for rapid turnover of materials in large-scale production operations.

[0029] During the transportation of the electromagnetic lock of the present invention, the rear baffle is locked, effectively preventing the accidental dropping of materials and ensuring transportation safety. On the other hand, the automation of the unloading process reduces the direct contact between the operator and the moving parts and materials, and reduces the risk of safety accidents caused by improper manual operations, such as being pinched by moving parts or injured by materials. At the same time, the system conducts an initial inspection of key components before operation, can detect potential faults in a timely manner, and avoid accidents during the unloading process.

[0030] The present invention obtains real-time data through height sensors and pressure sensors, and uses the PID control algorithm to precisely control the telescoping of the hydraulic cylinder. Whether it is adjusting the motor speed according to the material weight during the hoisting of the hopper to ensure the stable rise of the hopper, or ensuring its stable descent when the hopper falls back into place, it can effectively avoid problems such as the shaking and tilting of the hopper caused by improper operation, ensure the stability and reliability of the unloading process, reduce damage to the equipment, and extend the service life of the equipment. Brief Description of the Drawings

[0031] Figure 1 It is a schematic diagram of a method for automatically controlling the unloading of the hopper of a mechanical vehicle in Embodiment 1 of the present invention;

[0032] Figure 2 It is a schematic diagram of the structure of a mechanical vehicle in Embodiment 1 of the present invention;

[0033] Figure 3 It is another schematic diagram of the structure of a mechanical vehicle in Embodiment 1 of the present invention;

[0034] Figure 4 It is a schematic diagram of the structure of the unloading hook of a mechanical vehicle in Embodiment 1 of the present invention;

[0035] Among them, 1, hopper; 2, hydraulic cylinder; 3, unloading hook; 4, connecting chain. Detailed Embodiment

[0036] The present invention will be further described in detail below with reference to the accompanying drawings.

[0037] Embodiment 1

[0038] Refer to Figure 1 , a method for automatically controlling the unloading of the hopper of a mechanical vehicle in this embodiment includes:

[0039] The system is powered on and initialized;

[0040] Obtain the unloading instruction, start the drive motor through the controller, and drive the hydraulic cylinder to extend to lift the hopper;

[0041] Obtain the real-time data of the height sensor and the pressure sensor, and use the controller to control the telescoping of the hydraulic rod according to the sensing data;

[0042] Drive the discharge hook to rotate by using the connecting chain, so that the rear baffle loses its limit and the discharging is realized.

[0043] Use the controller to make the hopper fall back in place based on the descending control strategy.

[0044] Specifically:

[0045] After receiving the discharging instruction, the controller sends a short pulse signal to the drive motor. Assume the signal voltage is 5V and the duration is 10ms. If the motor responds normally, a weak current feedback signal will be generated. The controller judges whether the motor can work normally by detecting the presence or absence of this feedback signal.

[0046] Sensor initial value check: Read the initial value of the pressure sensor. When the initial voltage value output by the pressure sensor is 2V, corresponding to its pressure measurement range of 0 - 10MPa. According to its conversion formula, convert the voltage value to the pressure value. Assume the conversion formula is P=(V - 1)×10 (where P is the pressure value and V is the voltage value), and the calculated initial pressure value is 10MPa. Then compare it with the set normal working pressure range (3 - 8MPa). If it exceeds the range, an alarm will be issued.

[0047] Read the initial value of the height sensor. The initial distance value output by the laser ranging height sensor is 50cm, corresponding to its measurement range of 0 - 200cm. Compare this initial value with the set normal working range (10 - 40cm). If it exceeds the range, corresponding processing will be carried out.

[0048] Electromagnetic lock and limit switch check:

[0049] Check the locking state of the electromagnetic lock. By reading the level of the status pin of the electromagnetic lock, if it is high level, it means locked; if it is low level, it means unlocked. If the unlocked state is detected, immediately start the electromagnetic lock to lock it.

[0050] Check whether the limit switch can be triggered normally. Manually simulate the extreme position of the hopper and observe whether the limit switch can normally generate a signal change. If it cannot be triggered normally, troubleshoot the fault.

[0051] Discharging instruction receiving and hopper lifting stage

[0052] Drive motor control: When the STM32 series controller receives the discharging instruction, it generates a drive signal to control the drive motor. The rated voltage of the motor is 24V, and the conduction combination of four power transistors is controlled by the H-bridge drive circuit. When the motor needs to rotate forward, make transistors Q1 and Q4 conduct, and Q2 and Q3 cut off. The current flows from the positive pole of the power supply through Q1, the motor winding, Q4 back to the negative pole of the power supply, realizing the forward rotation of the motor and driving the hydraulic cylinder to extend.

[0053] PWM speed control: Set the discharging strategy in advance and adjust the motor speed according to the material weight. The material weight is obtained by converting the measured value of the pressure sensor. When the material weight is greater than the set threshold (5 tons), to ensure the stable lifting of the hopper, the duty cycle of the PWM signal is reduced. When the initial duty cycle is 80%, the duty cycle is reduced to 50% at this time. By adjusting the duty cycle of the PWM signal, the average voltage of the motor is changed, thereby adjusting the motor speed. Suppose the period of the PWM signal is 100 ms. When the duty cycle is 50%, the high-level duration is 50 ms and the low-level duration is 50 ms. The motor runs at a lower speed in this case.

[0054] Hydraulic rod telescopic control stage based on sensor data

[0055] Sensor data acquisition: The laser ranging height sensor is connected to the controller in a master-slave communication mode through the SPI interface. For example, the height sensor sends data to the controller at a frequency of 100 Hz, and each data sent is a 16-bit binary number representing the distance value. The controller receives the data according to the SPI communication protocol and converts it into the actual distance value. The piezoresistive pressure sensor is connected to the controller through the I 2 C bus. Suppose the pressure sensor sends data at a frequency of 50 Hz, and each data sent is a 12-bit binary number. The controller reads the data according to the I 2 C bus protocol and converts it into the pressure value.

[0056] Calculation process of the PID control algorithm: Set the target height value H set of the hydraulic cylinder to 150 cm and the target pressure value P set to 5 MPa. The actual measured values H measured and P measured are obtained in real time through the height sensor and the pressure sensor.

[0057] Calculate the height deviation e h =H set -H measured and the pressure deviation e p =P set -P measured .

[0058] Proportional link: Generate a control signal u h proportional to the deviation according to the height deviation e p-h =K p-h ×e h , where K p-h is the height proportionality coefficient, assumed to be 0.5. Similarly, for the pressure deviation, generate u p-p =K p-p ×e p , K p-pis the pressure proportionality coefficient, set to 0.3.

[0059] Integration stage: Integrate the height deviation. Where K i-h is the height integral coefficient, set to 0.1. Integrate the pressure deviation u i-p =K i-p ×∫0 t e p dt,K i-p is the pressure integral coefficient, set to 0.05.

[0060] Differential link: according to the rate of change of height deviation Generate control signal K d-h is the height differential coefficient, set to 0.2. According to the rate of change of pressure deviation Generate control signal K d-p is the pressure differential coefficient, set to 0.15.

[0061] Combining the control values of height and pressure, we get the final control signal:

[0062] u=u p-h +u i-h +u d-h +u p-p +u i-p +u d-p The control signal is used to control the telescopic length of the hydraulic cylinder.

[0063] Unloading and hopper falling back stage

[0064] Discharging process: After the hydraulic cylinder lifts the hopper to a suitable height, the connecting chain is used to drive the unloading hook to rotate. Assuming that the length of the connecting chain is 1m and the length of the unloading hook is 0.5m, the geometric relationship between the connecting chain and the unloading hook is calculated to determine the rotation angle of the unloading hook so that the rear baffle loses its limit. For example, when the connecting chain pulls the unloading hook to rotate 30°, the limit of the rear baffle is released and the material begins to be discharged from the unloading port.

[0065] The hopper falls back to its original position: The controller makes the hopper fall back to its original position based on the descending control strategy. First, the hydraulic cylinder is retracted by driving the motor in reverse. Assuming that the motor is reversed, the H-bridge drive circuit turns on transistors Q2 and Q3, and turns off Q1 and Q4 to achieve motor reversal. During the falling process, the data from the height sensor and pressure sensor are continuously used to adjust the motor speed through the PID control algorithm to ensure that the hopper falls smoothly. When the height sensor detects that the hopper has returned to its initial position, the drive motor is stopped to complete a discharge cycle.

[0066] Example 2

[0067] Reference Figure 2 、 Figure 3 and Figure 4 For this embodiment, a second aspect is provided. An automatic unloading control system for the hopper 1 of a mechanical vehicle provided by the present invention includes: a hopper 1 provided on the vehicle frame for transporting materials. A discharge port is provided at the bottom of the hopper 1, and a switchable rear baffle is installed at the discharge port.

[0068] A connecting chain 4 is connected to the hopper 1, and the other end of the connecting chain 4 is connected to a discharge hook 3.

[0069] The discharge hook 3 is hinged to the vehicle frame, one end is connected to the connecting chain 4, and the other end limits the rear baffle.

[0070] Specifically, the hopper 1 of this embodiment is installed on the vehicle frame of the mechanical vehicle, and the capacity of the hopper 1 is 5 cubic meters. The size of the bottom discharge port is 2 meters in length and 1 meter in width. The rear baffle is made of high-strength steel and is connected to the edge of the discharge port through a hinge, and can be rotated upward around the hinge axis to open for unloading.

[0071] The connecting chain 4 is made of high-strength alloy steel chain, with a length of 1.5 meters. One end is fixed to the upper side fixing point of the hopper 1 through a strong hook, and the other end is connected to the discharge hook 3.

[0072] The discharge hook 3 is hinged at a position on the vehicle frame close to the discharge port, and the length of the discharge hook 3 is 0.8 meters. One end is connected to the connecting chain 4, and the other end is designed with a special slot structure. When the slot catches the protrusion on the edge of the rear baffle, the opening of the rear baffle can be restricted.

[0073] The hydraulic cylinder 2 is installed between the vehicle frame and the bottom of the hopper 1, and is a single-acting hydraulic cylinder 2 with a maximum stroke of 1.2 meters. The hydraulic cylinder 2 is equipped with a high-precision piezoresistive pressure sensor, which can accurately measure the internal pressure of the hydraulic cylinder 2, and the measurement range is 0 - 20 MPa.

[0074] The controller uses an industrial programmable logic controller (PLC), model Siemens S7-200SMART. This controller has multiple digital input / output ports and analog input ports for receiving various signals and controlling external devices. The controller is connected to a relay through a dedicated drive circuit, and the relay is then connected to a drive motor to control the operation of the drive motor.

[0075] The electromagnetic lock is installed inside the rear baffle and is an electro-controlled permanent magnetic electromagnetic lock. When the electromagnetic lock is energized, it generates a strong magnetic force to tightly adsorb the rear baffle to the edge of the discharge port, ensuring that the rear baffle will not accidentally open during transportation.

[0076] Working process

[0077] Transportation stage: After the mechanical vehicle is filled with materials, it travels to the designated unloading location. At this time, the electromagnetic lock is in the powered-locked state, and the rear baffle is firmly fixed to prevent material leakage.

[0078] Unloading preparation: The driver presses the unloading button in the cab, and the button signal is transmitted as an unloading instruction to the PLC controller through a cable. After receiving the unloading instruction, the PLC controller first checks whether the electromagnetic lock is in the locked state and whether the limit switch is normal (by reading the signals of the corresponding sensors). If everything is normal, the PLC sends a power-off signal to the electromagnetic lock to unlock the rear baffle. At the same time, the drive motor is started through the drive circuit and relay, and the drive motor drives the hydraulic pump to work, causing the hydraulic cylinder 2 to start extending.

[0079] Hopper 1 lifting: As the hydraulic cylinder 2 extends, the hopper 1 is gradually lifted. During this process, the pressure sensor real-time monitors the internal pressure of the hydraulic cylinder 2 and converts the pressure signal into an electrical signal and transmits it to the PLC controller. According to the pre-set unloading strategy, when the PLC detects that the pressure value (corresponding to the material weight) is greater than the set threshold (for example, through pressure-weight conversion, the corresponding material weight is 8 tons), it adjusts the duty cycle of the PWM signal of the drive motor to reduce the motor speed to ensure the smooth lifting of the hopper 1. For example, under normal circumstances, the PWM duty cycle is 70%, and when the pressure exceeds the threshold, it is reduced to 50%.

[0080] Unloading process: When the hopper 1 is lifted to a certain height (such as 1 meter), the connecting chain 4 is tightened and drives the unloading hook 3 to rotate. Due to the special design of the unloading hook 3, when it rotates to a certain angle (such as 45°), the card slot of the unloading hook 3 disengages from the protrusion on the edge of the rear baffle, the rear baffle loses its limit, and automatically opens under the action of the material gravity, and the material is unloaded from the unloading port.

[0081] Hopper 1 falling back to position: After the material unloading is completed, the PLC controller controls the drive motor to reverse through the drive circuit and relay according to the pre-set descent control strategy, driving the hydraulic cylinder 2 to contract. During the fall of the hopper 1, the PLC continues to real-time monitor the data of the height sensor and the pressure sensor, and uses the PID control algorithm to adjust the speed of the drive motor to ensure the smooth fall of the hopper 1. When the height sensor detects that the hopper 1 returns to the initial position and the pressure sensor detects that the pressure of the hydraulic cylinder 2 returns to the no-load pressure range, the PLC controller stops the drive motor to complete one unloading cycle.

[0082] The above are all preferred embodiments of the present invention, and the protection scope of the present invention is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. An automatic unloading control method for a mechanical vehicle hopper, characterized in that, It includes: System power-on initialization; Obtain the unloading instruction, start the driving motor through the controller, and drive the hydraulic cylinder to extend to lift the hopper; Obtain the real-time data of the height sensor and the pressure sensor, and use the controller to control the telescopic of the hydraulic rod according to the sensing data; Drive the unloading hook to rotate by using the connecting chain, so that the rear baffle loses its limit and realizes unloading; Use the controller to make the hopper fall back to its original position based on the descending control strategy.

2. The automatic unloading control method of the mechanical vehicle hopper according to claim 1, characterized in that The system power-on initialization includes sending a short pulse signal to the driving motor through the controller to detect whether the driving motor responds; reading the initial values of the pressure sensor and the height sensor to judge whether they are within the set range; checking whether the electromagnetic lock is in the locked state, and checking whether the limit switch can be triggered normally.

3. A method for automatically controlling the discharge of a mechanical vehicle hopper according to claim 2, characterized in that The process of starting the driving motor through the controller and driving the hydraulic cylinder to extend to lift the hopper includes that after receiving the unloading instruction by the STM32 series controller, a driving signal for controlling the driving motor is generated and sent to the driving motor through the H-bridge driving circuit. Among them, through different conduction combinations of four power transistors, the current direction of the motor is changed, so as to realize the forward rotation of the driving motor.

4. The automatic unloading control method of the mechanical vehicle hopper according to claim 3, characterized in that The process of starting the driving motor through the controller and driving the hydraulic cylinder to extend to lift the hopper also includes using the controller to generate pulse width modulation PWM signals with different duty cycles according to the preset unloading strategy to adjust the speed of the motor. Among them, when the material weight is greater than the set threshold, in order to ensure the stable lifting of the hopper, the controller realizes the low-speed operation of the driving motor by reducing the duty cycle of the PWM signal.

5. A method for automatically controlling the unloading of a mechanical vehicle hopper according to claim 4, characterized in that Obtaining the real-time data of the height sensor and the pressure sensor, and using the controller to control the telescopic movement of the hydraulic rod according to the sensing data, including respectively obtaining the sensing data of the laser ranging type height sensor and the piezoresistive pressure sensor, wherein the laser ranging type height sensing data is connected to the controller through the SPI interface for master-slave communication, and the piezoresistive pressure sensing data is 2 connected to the controller through the I C bus, and the controller generates a hydraulic cylinder control strategy through a preset control algorithm to control the telescopic length of the hydraulic cylinder.

6. A method for automatically controlling the unloading of a mechanical vehicle hopper according to claim 5, characterized in that The controller generates a hydraulic cylinder control strategy through a preset control algorithm to control the telescopic length of the hydraulic cylinder, including that the controller calculates the deviation between the actual measured value and the set value through the PID control algorithm to obtain the control quantity. Among them, in the proportional link, a control signal proportional to the deviation is generated according to the deviation size to respond to the corresponding deviation; the integral link integrates the deviation to eliminate the steady-state deviation of the system; the differential link generates a control signal according to the change rate of the deviation to predict the change trend of the deviation. By adjusting the parameters of the PID control algorithm, the telescopic control of the hydraulic cylinder reaches the optimal effect.

7. An automatic unloading control system for a mechanical vehicle hopper, characterized in that, It includes: A hopper provided on the vehicle frame for transporting materials. The bottom of the hopper is provided with a discharge port, and an openable and closable rear baffle is installed at the discharge port; A connecting chain connected to the hopper, and the other end of the connecting chain is connected to the unloading hook; An unloading hook hinged on the vehicle frame, one end is connected to the connecting chain, and the other end limits the rear baffle.

8. The automatic unloading control system for the mechanical vehicle hopper according to claim 1, characterized in that, It also includes a hydraulic cylinder for lifting the hydraulic cylinder, and a pressure sensor is equipped on the hydraulic cylinder to real-time monitor the internal pressure of the hydraulic cylinder.

9. The automatic unloading control system for the mechanical vehicle hopper according to claim 1, characterized in that It also includes a controller. The controller controls the driving motor through the driving circuit and the relay, and the driving motor controls the hydraulic cylinder.

10. A mechanical vehicle hopper automatic discharging control system according to claim 1, characterized in that, An electromagnetic lock is also installed on the rear baffle, and the electromagnetic lock locks the rear baffle.

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