A fully automatic sand production line feeding control system

Abstract

This invention relates to the field of automatic control technology for sand making equipment, and discloses a fully automatic sand making production line feeding control system, including a hopper, an electric discharge control valve system, a rotary feeder, a cone crusher, an operating status detection unit, a PLC controller, and a remote control terminal. The electric discharge control valve system is located between the hopper and the cone crusher inlet, and includes an electric actuator, valve stem, guide rail, chute, valve body, and opening / closing element. The PLC controller receives a 4-20mA analog signal sent from the remote control terminal, converts it into a target opening degree signal for the opening / closing element, and combines it with operating status information, preset threshold comparison results, and actual opening degree feedback of the opening / closing element to correct and control the opening degree of the opening / closing element. After the material enters the rotary feeder through the chute, it is dispersed into the cavity along the circumferential direction of the cone crusher inlet, and forms a continuous closed-loop regulation under the action of timed re-detection and re-adjustment. This invention can dynamically adjust the feed rate according to the real-time operating status of the cone crusher, improve the uniformity of feeding and distribution, reduce the risk of material blockage and off-center loading, and improve the system's operating stability and automation level.

Description

Technical Field

[0001] This invention relates to the field of automatic control technology for sand making equipment, and in particular to a fully automatic feeding control system for a sand making production line applied to the upstream feeding path of a cone crusher, used to achieve automatic adjustment of the feed rate and uniform circumferential material distribution. Background Technology

[0002] In a cone crusher production line, the cone crusher is typically fed continuously from an upstream hopper. Cone crushers have high requirements for feed rate, feed continuity, and uniform material distribution within the chamber. If the amount of material entering the cone crusher is too large, it can easily cause increased load in the crushing or sand-making chamber, material accumulation, blockage, stalling, or abnormal equipment shutdown. Conversely, if the amount of material entering the cone crusher is too small, the equipment will struggle to maintain a stable load, leading to reduced sand-making efficiency and decreased output per unit time.

[0003] In the prior art, there are already control schemes that automatically adjust the feed rate based on the crusher's operating status. For example, US Patent Document US4804148A discloses a crusher control system that detects the drive motor power and the material level in the crushing chamber, and inputs the detection signals to a programmable logic controller (PLC). The PLC then adjusts the feed rate of the feeding device that supplies material to the crusher accordingly. Chinese Patent Document CN102000627A discloses an automatic control device and method for filling the feed chamber of a cone crusher, which uses an ultrasonic level sensor and a PLC to achieve automatic adjustment of feeding and crushing.

[0004] On the other hand, there are also existing technologies to improve the uniformity of material distribution before it enters a cone crusher. For example, international patent document WO2013028264A1 discloses a rotary feeder suitable for cone crushers, which is used to desegregate and circumferentially disperse the material before it enters the crusher, so as to improve the spatial distribution of the material when it enters the crushing chamber.

[0005] However, most of the aforementioned existing technologies focus on one aspect of automatic feed rate adjustment or circumferential material distribution. For cone crushing production lines, the incoming particle size, moisture content, packing state, feeding continuity, and the real-time load status of the cone crusher all continuously change during production. If only an automatic feed rate adjustment scheme is used, it is difficult to ensure uniform circumferential material distribution before the material enters the crushing chamber; if only a rotary material distribution scheme is used, it is difficult to continuously and accurately adjust the feed rate according to the real-time operating status of the cone crusher.

[0006] Therefore, it is still necessary to propose a fully automatic sand making production line feeding control system that combines precise adjustment of the feed opening, feedback of the actual opening of the opening and closing parts, comprehensive judgment of the operating status of the cone crusher, priority handling of material blockage risk, timed re-inspection, and coordinated circumferential material distribution. Summary of the Invention

[0007] Design Purpose: The purpose of this invention is to provide a fully automatic sand making production line feeding control system to solve the problems in existing cone sand making production lines, such as independent adjustment of feeding amount and circumferential material distribution, insufficient control precision, untimely judgment of material blockage risk, and difficulty in matching the feeding status with the real-time operating status of the cone sand making machine.

[0008] This invention achieves precise adjustment of the material channel opening before entering the cone crusher through an electric discharge control valve system. It forms a closed-loop control of the opening through feedback of the actual opening of the opening and closing components. The operating status information of the cone crusher is acquired by the operating status detection unit, and the PLC controller corrects the target opening according to the priority of increased material blockage risk, increased load, normal operation, and decreased load. Simultaneously, a rotary feeder distributes the material, after opening adjustment, into the cavity along the circumference of the cone crusher's feed inlet, thereby achieving coordinated control of feed rate, suppression of material blockage risk, and uniform circumferential material distribution.

[0009] Design Scheme: To achieve the above objectives, the design mechanism of this invention is as follows: A fully automatic sand making production line feeding control system is implemented by placing an electric discharge control valve system between the hopper and the feed inlet of the cone crusher. This ensures that the material before entering the cone crusher first passes through a material channel with a controllable opening. During operation, the material in the hopper moves downwards under its own weight. The PLC controller receives a 4-20mA analog signal from the remote control terminal and converts this signal into a target opening degree signal for the corresponding opening / closing element, thereby controlling the electric actuator. The output end of the electric actuator rotates through an internal threaded connection that mates with the external thread of the valve stem, converting the rotational motion into axial linear motion of the valve stem. This causes the opening / closing element to move along a predetermined path within the valve body, changing the flow cross-section of the material channel within the valve body and thus regulating the material flow rate and feed cross-section.

[0010] To ensure the stability of the opening and closing mechanism's operation and the accuracy of its opening adjustment, displacement sensors, encoders, or stroke detection switches are installed along the movement path of the valve stem or the opening and closing mechanism to detect the actual opening degree. The PLC controller compares the detected actual opening degree with the target opening degree and, based on the comparison result, continues to output or stops outputting control signals to the electric actuator, thus forming a closed-loop opening degree adjustment. Therefore, the opening and closing mechanism can achieve precise position adjustment corresponding to the input signal from the remote control terminal within an opening degree range of 0-150mm, matching the material channel opening degree with the target feeding requirements.

[0011] After being adjusted by the opening and closing mechanism, the material enters the chute from the discharge side of the valve body and further enters the rotary feeder located between the discharge end of the chute and the feed inlet of the cone crusher. The rotary feeder includes a receiving section for receiving the material and a rotating distributing section for circumferentially dispersing, guiding, or distributing the material. Under the driving action, the rotating distributing section rotates around the central axis of the feed inlet of the cone crusher or an axis adjacent to that central axis, thereby distributing the material from the chute into the cone crusher cavity along the circumferential direction of the feed inlet. Through the above-mentioned distributing method, the material entering the cavity can be changed from concentrated falling to circumferentially dispersed entry, making the spatial distribution of the feed more uniform.

[0012] Meanwhile, the operation status detection unit acquires the operation status information of the cone crusher in real time. This operation status information includes at least one or more of the following: main motor current, main motor power, load rate, output per unit time, material level in the chamber, and blockage status. The main motor current is the current in the main motor power supply circuit of the cone crusher. The main motor current and main motor power can be obtained through current detection devices and power detection devices respectively installed in the main motor power supply circuit. The output per unit time can be obtained through a metering device or flow detection device. The material level in the chamber can be obtained through a material level detection device. The blockage status can be directly detected by a blockage detection device installed at the chute, rotary feeder, or feed inlet; alternatively, the blockage status can also be determined by the PLC controller based on at least two of the following: increased main motor current, persistently high material level in the chamber, and decreased output per unit time, all meeting the corresponding abnormal threshold. The load rate can be calculated by the PLC controller based on the ratio of real-time main motor current to rated current, or the ratio of real-time main motor power to rated power.

[0013] The PLC controller pre-stores preset thresholds corresponding to host current, main motor power, load rate, output per unit time, material level in the chamber, and blockage status. It compares the real-time acquired operating status information with these preset thresholds to determine the current operating condition of the cone crusher. When multiple judgment results occur simultaneously, the PLC controller performs a comprehensive judgment based on the priority of increased blockage risk, increased load, normal operation, and decreased load, and accordingly adjusts the target opening degree of the opening and closing components, generating a new control signal output to the electric actuator. When the system determines that the risk of blockage is increased or the load is increased, it reduces the amount of material entering the cone crusher by decreasing the opening degree of the opening and closing components; when the system determines that the load is decreased, it increases the material supply by increasing the opening degree of the opening and closing components; when the system is in normal operation, it maintains the current opening degree or makes a slight adjustment, thereby coordinating the material supply status with the real-time load status of the cone crusher.

[0014] In addition, the PLC controller is equipped with a timing module that starts timing after each control signal to the electric actuator is output. When the timing reaches the preset time, the operating status information of the cone crusher is acquired again, and the comparison, judgment, target opening correction, and readjustment process are re-executed based on the acquired operating status information. This forms a cyclical control mechanism of "remote setting - opening execution - status detection - threshold comparison - comprehensive judgment - opening correction - readjustment", enabling the system to continuously adjust the feed rate and material distribution status according to changes in the operating conditions of the cone crusher, realizing the automation and continuity of feed control.

[0015] Technical solution: A fully automatic sand making production line feeding control system, including a hopper, an electric discharge control valve system, a rotary feeder, a cone sand making machine, an operating status detection unit, a PLC controller and a remote control terminal.

[0016] The electric discharge control valve system is installed on the discharge passage of the hopper and located between the hopper and the feed inlet of the cone crusher. The electric discharge control valve system includes an electric actuator, valve stem, guide rail, chute, valve body, and opening / closing element. The opening / closing element is located within the valve body and connected to the valve stem. The chute is located on the discharge side of the valve body and communicates with the discharge end of the valve body.

[0017] The rotary feeder is positioned between the discharge end of the chute and the inlet of the cone crusher. The rotary feeder includes a receiving section for receiving material falling from the chute and a rotating distributing section for circumferentially dispersing, guiding, or distributing the material. The rotating distributing section rotates around the central axis of the cone crusher inlet or an axis adjacent to that central axis, distributing the material, adjusted by the opening and closing mechanism, into the cavity along the circumferential direction of the cone crusher inlet.

[0018] The operating status detection unit is used to acquire the operating status information of the cone crusher. The operating status information includes one or more of the following: main motor current, main motor power, load rate, output per unit time, material level in the chamber, and blockage status. The load rate can be calculated by the PLC controller based on the ratio of real-time main motor current to rated current, or based on the ratio of real-time main motor power to rated power.

[0019] The PLC controller is electrically connected to the remote control terminal, the operation status detection unit, and the electric actuator. The PLC controller receives the opening degree command signal from the remote control terminal and converts it into a target opening degree signal for the opening / closing element. The PLC controller compares the operation status information with corresponding preset thresholds and corrects the target opening degree signal according to the priority of increased material blockage risk, increased load, normal operation, and decreased load, generating a control signal for the electric actuator.

[0020] The electric actuator drives the valve stem to move the opening / closing element within the valve body according to the control signal, thereby adjusting the opening degree of the material passage. Displacement sensors, encoders, or stroke detection switches are installed along the movement path of the valve stem or opening / closing element to detect the actual opening degree. The PLC controller compares the actual opening degree with the target opening degree signal and, based on the deviation, continues to output, corrects the output, or stops outputting control signals to the electric actuator, thus forming a closed-loop control of the opening degree of the opening / closing element.

[0021] The PLC controller is also equipped with a timing module. After each output of a control signal to the electric actuator, the timing module starts timing; when the timing reaches the preset time, the PLC controller re-acquires the operating status information of the cone crusher, and re-executes threshold comparison, status judgment, target opening correction and readjustment based on the re-acquired operating status information.

[0022] Compared with existing technologies, this invention has three key advantages: First, it adjusts the opening of the material channel before entering the cone crusher using an electric discharge control valve system. This allows for dynamic adjustments to the feed rate based on signals from a remote control terminal and the real-time operating status of the cone crusher, ensuring the feed rate matches the equipment's current capacity. Second, it detects the actual opening of the opening and closing components using displacement sensors, encoders, or stroke detection switches. The PLC controller compares the actual opening with the target opening, forming a closed-loop control system that improves the accuracy of the opening and closing component position control and reduces feed rate fluctuations caused by opening errors. Third, it comprehensively assesses one or more operating statuses, including main motor current, main motor power, load rate, output per unit time, material level in the chamber, and blockage status. Control is prioritized according to the following conditions: increased risk of blockage, increased load, normal operation, and decreased load. This allows for a priority reduction in the feed rate when blockage risk or abnormal load occurs, enhancing system protection capabilities. Fourth, this invention incorporates a rotary feeder downstream of the electric discharge control valve system, distributing the material, after adjustment by the opening and closing components, along the circumferential direction of the cone crusher's inlet into the cavity. This reduces uneven loading, localized accumulation, and inconsistent material distribution within the cavity caused by concentrated feeding. Fifth, this invention utilizes a timing module for re-detection and readjustment, and can be combined with filtering, dead zone detection, duration detection, or hysteresis detection to reduce frequent operation of the opening and closing components, enabling the system to form a continuous and stable closed-loop feeding control process.

[0023] This invention does not simply combine automatic feeding control and a rotary feeder in parallel. Instead, it achieves precise adjustment of the feed opening through an electric discharge control valve system. A closed loop of opening and closing component positions is formed through actual opening feedback. The operating status of the cone crusher is acquired by a running status detection unit, and the PLC controller corrects the target opening according to the priority of material blockage risk, load increase, normal operation, and load decrease. Simultaneously, the rotary feeder distributes the material, after opening adjustment, into the cavity along the circumference of the feed inlet. Continuous closed-loop control is formed through timed re-detection and readjustment. Therefore, this invention achieves coordinated control of feed rate adjustment, material blockage risk suppression, and circumferential uniform material distribution, improving the operational stability and automation level of the cone crusher production line. Attached Figure Description

[0024] Figure 1 This is a system block diagram of the feeding control system for the fully automated sand making production line of the present invention.

[0025] In the diagram: 1. Hopper; 2. Electric actuator; 3. Valve stem; 4. Guide rail; 5. Chute; 6. Valve body; 7. Opening and closing parts; 8. Cone crusher; 9. Feed inlet; 10. PLC controller; 11. Rotary feeder. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following embodiments.

[0027] like Figure 1 As shown, this embodiment provides a fully automatic sand making production line feeding control system, including a hopper 1, an electric discharge control valve system, a cone sand making machine 8, a PLC controller 10, a rotary feeder 11, an operating status detection unit, and a remote control terminal.

[0028] An electric discharge control valve system is installed on the discharge passage of hopper 1, located between hopper 1 and the feed inlet 9 of cone crusher 8, and is used to adjust the opening of the material passage before it enters cone crusher 8. The electric discharge control valve system includes an electric actuator 2, a valve stem 3, a guide rail 4, a chute 5, a valve body 6, and an opening / closing element 7. The opening / closing element 7 is located inside the valve body 6 and connected to the valve stem 3. The guide rail 4 guides the movement of the valve stem 3 and / or the opening / closing element 7. The chute 5 is located on the discharge side of the valve body 6 and communicates with the discharge end of the valve body 6, used to receive the material discharged after adjustment by the opening / closing element 7 and guide it downstream.

[0029] A rotary feeder 11 is positioned between the discharge end of the chute 5 and the inlet 9 of the cone crusher 8, and is used to circumferentially distribute the material entering the cone crusher 8. The rotary feeder 11 has a receiving section for receiving material falling from the chute 5, and a rotary distributing section for circumferentially dispersing, guiding, or distributing the material. The rotary distributing section may include one or more of a rotating disc, distributing blades, guide ribs, conical guide components, or annular distributing components. Under driving action, the rotary distributing section rotates around the central axis of the inlet 9 of the cone crusher 8 or an axis adjacent to that central axis, thereby distributing the material from the chute 5 circumferentially into the cavity of the cone crusher 8.

[0030] The operation status detection unit is used to acquire the operation status information of the cone crusher 8. The operation status information includes one or more of the following: main motor current, main motor power, load rate, output per unit time, material level in the chamber, and blockage status. Specifically, the main motor current and main motor power can be obtained through current detection devices and power detection devices respectively installed in the main motor power supply circuit of the cone crusher 8; the output per unit time can be obtained through a metering device or a flow detection device; the material level in the chamber can be obtained through a material level detection device; and the blockage status can be directly detected by blockage detection devices installed at the chute 5, rotary feeder 11, or feed inlet 9. The load rate can be calculated by the PLC controller 10 based on the ratio of real-time main motor current to rated current, or based on the ratio of real-time main motor power to rated power.

[0031] The PLC controller 10 is electrically connected to a remote control terminal, a running status detection unit, and an electric actuator 2. The remote control terminal sends an opening degree setpoint signal to the PLC controller 10. This opening degree setpoint signal can be one of a 4-20mA analog signal, a digital control signal, or a communication control signal. When the opening degree setpoint signal is a 4-20mA analog signal, the PLC controller 10 receives the 4-20mA analog signal through the analog input module and converts it into a target opening degree signal corresponding to the opening degree range of the opening / closing element 7.

[0032] The output end of the electric actuator 2 is provided with an internal thread connection that mates with the external thread section of the valve stem 3. During operation, the electric actuator 2 drives the internal thread connection to rotate, converting the rotational motion into the axial linear motion of the valve stem 3 via threaded transmission. Guided by the guide rail 4, the valve stem 3 drives the opening / closing element 7 to move in a predetermined direction within the valve body 6, thereby changing the flow cross-section of the material passage within the valve body 6 and regulating the flow rate of the falling material.

[0033] To improve the opening accuracy of the valve stem 3 or the valve stem 7, a displacement sensor, encoder, or stroke detection switch is installed on the movement path of the valve stem 3 or the valve stem 7 to detect the actual opening degree of the valve stem 7. The PLC controller 10 compares the detected actual opening degree with the target opening degree signal, and continues to output, corrects the output, or stops outputting the control signal to the electric actuator 2 according to the deviation between the two, so that the valve stem 7 reaches the target position, thereby forming a closed-loop control of the opening degree of the valve stem 7.

[0034] During operation, the operation status detection unit acquires the real-time operation status information of the cone crusher 8 and sends the information to the PLC controller 10. The PLC controller 10 has pre-stored preset thresholds for main unit current, main motor power, load rate, output per unit time, material level in the chamber, and blockage status. The PLC controller 10 compares the real-time acquired operation status information with the corresponding preset thresholds and makes a comprehensive judgment based on multiple comparison results.

[0035] In one embodiment, the blockage status is directly detected by a blockage detection device. In another embodiment, the blockage status is determined by the PLC controller 10 based on at least two of the following: an increase in the main unit current, a persistently high material level in the cavity, and a decrease in output per unit time, all of which meet corresponding abnormal thresholds. Output per unit time serves as an auxiliary parameter for determining the risk of blockage or the load status, and is used in conjunction with the main unit current, main motor power, or material level in the cavity for comprehensive determination.

[0036] When multiple judgment results occur simultaneously, the PLC controller 10 determines the priority according to the states of increased material blockage risk, increased load, normal operation, and decreased load, and corrects the target opening signal of the opening / closing element 7 accordingly. Specifically, when the PLC controller 10 determines that the state of increased material blockage risk or increased load is in effect, the PLC controller 10 controls the electric actuator 2 to move the opening / closing element 7 towards a decreasing opening to reduce the amount of material entering the cone crusher 8; when the PLC controller 10 determines that the state of decreased load is in effect, the PLC controller 10 controls the opening / closing element 7 to move towards a increasing opening to increase the material supply; when the PLC controller 10 determines that the state of normal operation is in effect, the current opening is maintained or a slight correction is made to match the real-time load state of the cone crusher 8.

[0037] The PLC controller 10 is also equipped with a timing module. After each output of a control signal to the electric actuator 2, the timing module starts timing. When the timing reaches a preset time, the PLC controller 10 re-acquires the operating status information of the cone crusher 8 and re-executes threshold comparison, status determination, target opening correction, and readjustment based on the re-acquired operating status information. During the readjustment process, the PLC controller 10 can perform one or more of the following on the re-acquired operating status information: filtering, dead zone judgment, duration judgment, or hysteresis judgment, to reduce the frequent operation of the opening and closing components 7.

[0038] After being adjusted by the opening and closing element 7, the material enters the chute 5 from the discharge side of the valve body 6, and is then guided by the rotary feeder 11 from the chute 5. After receiving and rotating the material from the chute 5, the rotary feeder 11 distributes the material into the cavity of the cone crusher 8 along the circumferential direction of the feed inlet 9, thereby changing the material from a concentrated falling method to a circumferentially dispersed entering method, which improves the uniformity of material distribution in the cavity and reduces the risk of uneven loading, local accumulation and blockage.

[0039] It should be noted that, without departing from the concept of this application, the specific structural form, installation method, signal acquisition method, threshold setting method, and control parameters of the above-mentioned components can be adjusted accordingly, and all should fall within the protection scope of this application.

Claims

1. A fully automated sand making production line feeding control system, characterized in that, It includes a hopper (1), an electric discharge control valve system, a rotary feeder (11), a cone crusher (8), an operating status detection unit, a PLC controller (10), and a remote control terminal; The electric discharge control valve system is set on the discharge passage of the hopper (1) and located between the hopper (1) and the feed inlet (9) of the cone sand making machine (8). The electric discharge control valve system includes an electric actuator (2), a valve stem (3), a guide rail (4), a chute (5), a valve body (6), and an opening and closing element (7). The opening and closing element (7) is set inside the valve body (6) and connected to the valve stem (3). The chute (5) is set on the discharge side of the valve body (6) and communicates with the discharge end of the valve body (6). The rotary feeder (11) is located between the discharge end of the chute (5) and the inlet (9) of the cone sand making machine (8). The rotary feeder (11) is provided with a receiving part for receiving the material falling from the chute (5) and a rotary spreading part for dispersing, guiding or distributing the material in the circumferential direction. The rotary spreading part rotates around the central axis of the inlet (9) of the cone sand making machine (8) or an axis adjacent to the central axis, so as to disperse the material after adjustment by the opening and closing part (7) into the cavity in the circumferential direction of the inlet (9) of the cone sand making machine (8). The operating status detection unit is used to obtain the operating status information of the cone crusher (8), which includes one or more of the following: main motor current, main motor power, load rate, output per unit time, material level in the cavity, and blockage status. The PLC controller (10) is electrically connected to the remote control terminal, the operating status detection unit and the electric actuator (2) respectively; The PLC controller (10) is used to receive the opening degree given signal sent by the remote control terminal and convert the opening degree given signal into the target opening degree signal of the opening and closing element (7); The PLC controller (10) is also used to compare the operating status information with the corresponding preset threshold, and to correct the target opening signal according to the priority of the material blockage risk increase state, load increase state, normal operation state and load decrease state, and generate a control signal for the electric actuator (2). The electric actuator (2) drives the valve stem (3) according to the control signal, which in turn drives the opening and closing element (7) to move within the valve body (6) to adjust the opening degree of the material channel; The PLC controller (10) also performs closed-loop control of the electric actuator (2) based on the actual opening degree feedback of the opening and closing element (7), and obtains the operating status information of the cone sand making machine (8) again after each opening degree adjustment in order to perform target opening degree correction and readjustment.

2. The fully automatic sand making production line feeding control system according to claim 1, characterized in that: The opening degree given signal is one of a 4-20mA analog signal, a digital control signal, or a communication control signal; when the opening degree given signal is a 4-20mA analog signal, the PLC controller (10) receives the 4-20mA analog signal through the analog input module and converts the 4-20mA analog signal into a target opening degree signal corresponding to the opening degree range of the opening and closing element (7).

3. The fully automatic sand making production line feeding control system according to claim 1, characterized in that: The output end of the electric actuator (2) is provided with an internal thread connection part that cooperates with the external thread section of the valve stem (3). The electric actuator (2) drives the internal thread connection part to rotate, so as to convert the rotational motion into the axial linear motion of the valve stem (3) through the thread transmission. Under the guidance of the guide rail (4), the valve stem (3) drives the opening and closing part (7) to move, thereby changing the flow cross section of the material channel in the valve body (6).

4. The fully automatic sand making production line feeding control system according to claim 1, characterized in that: A displacement sensor, encoder, or stroke detection switch is provided on the movement path of the valve stem (3) or the opening / closing element (7); the displacement sensor, encoder, or stroke detection switch is used to detect the actual opening degree of the opening / closing element (7); the PLC controller (10) compares the actual opening degree with the target opening degree signal, and continues to output, corrects the output, or stops outputting control signals to the electric actuator (2) according to the deviation between the two.

5. The fully automatic sand making production line feeding control system according to claim 1, characterized in that: The operating status detection unit includes one or more of the following: a current detection device and / or a power detection device installed in the power supply circuit of the main motor of the cone sand making machine (8); a metering device or a flow detection device for obtaining the output per unit time; a material level detection device for obtaining the material level in the cavity; and a blockage detection device for obtaining the blockage status. The load rate is calculated by the PLC controller (10) based on the ratio of the real-time main motor current to the rated current, or based on the ratio of the real-time main motor power to the rated power.

6. The fully automatic sand making production line feeding control system according to claim 1, characterized in that: The blockage state is directly detected by a blockage detection device located at the chute (5), the rotary feeder (11), or the feed inlet (9); or, the blockage state is determined by the PLC controller (10) based on at least two of the following: the host current increases, the material level in the cavity remains high, and the output per unit time decreases, which meet the corresponding abnormal threshold.

7. The fully automatic sand making production line feeding control system according to claim 1, characterized in that: When the PLC controller (10) determines that the material blockage risk is increased or the load is increased, the PLC controller (10) reduces the target opening signal to control the opening and closing element (7) to move in the direction of decreasing opening; when the PLC controller (10) determines that the load is reduced, the PLC controller (10) increases the target opening signal to control the opening and closing element (7) to move in the direction of increasing opening; when the PLC controller (10) determines that the operation is normal, the PLC controller (10) maintains the current target opening signal or makes a small correction to the current target opening signal.

8. The fully automatic sand making production line feeding control system according to claim 1, characterized in that: The PLC controller (10) is equipped with a timing module. After each output of a control signal to the electric actuator (2), the timing module starts timing. When the timing time reaches the preset time, the PLC controller (10) acquires the operating status information of the cone sand making machine (8) again, and re-executes threshold comparison, status judgment, target opening correction and readjustment based on the re-acquired operating status information. During the readjustment process, the PLC controller (10) performs filtering, dead zone judgment, duration judgment or hysteresis judgment on the re-acquired operating status information to reduce the frequent operation of the opening and closing device (7).

9. The fully automatic sand making production line feeding control system according to claim 1, characterized in that: The rotating material distribution unit includes one or more of a rotating disk, a material distribution blade, a material guide rib, a conical material guide, or an annular material distribution component; the rotating material distribution unit is driven to rotate by an independent drive device, or is linked with the downstream conveying component of the electric discharge control valve system; the rotation speed of the rotating material distribution unit is set to a speed range that satisfies the material being distributed along the circumferential direction of the feed inlet (9) of the cone sand making machine (8).

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