Automatic control system for a roller press

Abstract

This invention discloses an automatic control system for a roller press, relating to the field of material crushing and processing equipment control. This invention simplifies the original multi-stage start-stop system of the roller press to a one-button start-stop system. It can visually display fault information during the start-stop process for easy troubleshooting. During roller press operation, it automatically controls the working roller gap, hopper level, main motor operating frequency, and main motor operating current within a stable range by controlling the flow regulating plate of the feeding device, the feeding pneumatic valve, and the main motor frequency converter. Actual testing shows that compared to manual operation, this automatic control system significantly simplifies and reduces operator training costs and workload.

Description

Technical Field

[0001] This invention relates to the field of material crushing and processing equipment control, specifically to an automatic control system for a roller press. Background Technology

[0002] The statements in this section are provided only as background information in connection with this disclosure and may not constitute prior art.

[0003] The roller press is a new type of energy-saving cement grinding equipment. It can replace the high-energy-consuming and low-efficiency ball mill pre-grinding system, and reduce steel consumption and noise. It is suitable for new plant construction and can also be used for the technical transformation of old plants. As one of the most energy-efficient grinding equipment currently available, its working principle is high-pressure material layer crushing. Compared with traditional crushers, the roller press uses hydraulic system to provide extrusion pressure, which makes the pressure between the fixed roller and the moving roller reach hundreds or even thousands of tons, increasing the output of the ball mill system by 30-50%. In the material cake after extrusion, fine particles of 0.08mm account for 20-35%, and particles smaller than 2mm account for 65-85%. The internal structure of the small particles is filled with many micro-cracks due to extrusion, greatly improving their grindability.

[0004] The flow regulating plate of the roller press feed device can adjust the size of the working roller gap and the material level in the hopper. It is a key piece of equipment for the stable operation of the roller press and the control of the extrusion effect. Currently, the start-up and shutdown of the roller press and its auxiliary equipment, as well as the flow regulating plate, are still manually controlled by the operator. This requires the operator to have a high level of understanding of the roller press equipment and to monitor the roller press operating data at any time for adjustments. The operation is cumbersome and the workload is very large. Summary of the Invention

[0005] The purpose of this invention is to address the problems existing in the prior art by providing an automatic control system for a roller press. This system can automatically start and stop the main and auxiliary equipment of the roller press in sequence according to the process flow. During the start and stop process, it can detect the real-time status of the roller press equipment and issue corresponding start / stop information and alarm information. After the roller press is fully started, it can automatically interlock the opening of the flow regulating plate with the material level in the hopper, the working roller gap of the roller press, and the operating frequency of the main motor. Based on the material level in the hopper, it can automatically adjust the flow regulating plate and the operating frequency of the main motor to automatically control the working roller gap and material level of the roller press within a stable range. This greatly simplifies and reduces the workload of the operator and improves the stability and continuity of the roller press system operation.

[0006] The technical solution of the present invention is as follows:

[0007] An automatic control system for a roller press includes:

[0008] Hydraulic oil station, reducer oil station, bearing oil station, main motor, feed pneumatic valve, flow regulating plate controller, silo level detection device, roll gap detection device, pressure detection device, opening detection device, and control unit for controlling the above components;

[0009] The control unit can automatically control the working roll gap of the roller press and the material level in the hopper within a stable range by controlling the flow regulating plate controller, the feed pneumatic valve, and the main motor.

[0010] Furthermore, the control unit operates as follows:

[0011] Click the one-click start button, and the control unit will automatically start the roller press and each auxiliary device in the following order:

[0012] Hydraulic oil station -> Fixed roller reducer oil station -> Moving roller reducer oil station -> Bearing oil station -> Fixed roller main motor cooling fan -> Moving roller main motor cooling fan -> Activate start warning bell -> Fixed roller main motor -> Moving roller main motor -> Open feed pneumatic valve.

[0013] Furthermore, when the material level detection device detects that the material level in the silo is greater than the set high material level value, the control unit controls the feed pneumatic valve to open and sends a roller press operation signal; when the material level in the silo is less than the lower limit value during the operation of the roller press, the control unit closes the feed pneumatic valve.

[0014] Furthermore, after a certain delay after closing the feed pneumatic valve or after the main motor starting conditions are met when the roller press is started, the control unit adjusts the flow regulating plate to the set closing position through the flow regulating plate controller, and restores the given operating frequency of the main motor to the initial set value.

[0015] Furthermore, after the feed pneumatic valve is opened, the control unit adjusts the opening interval time every time material is fed, and at the same time controls the flow regulating plate controller to increase the opening of the flow regulating plate on the fixed roller side and the moving roller side according to the set value of the flow regulating plate opening adjustment range 1, until the opening of the flow regulating plates on both sides detected by the opening detection device is greater than the initial set value of the flow regulating plate interlock opening.

[0016] After the opening of the flow regulating plates on both sides is greater than the initial setting value of the interlock opening of the flow regulating plates, the working parameters of the roller press are monitored for two minutes. After the roller gap detection device and the pressure detection device detect the roller gap and pressure stabilize, the gap interlock adjustment is activated.

[0017] Furthermore, the gap interlock adjustment includes:

[0018] When the material level in the silo is lower than the low set value, the control unit controls the flow regulating plate controller to reduce the opening of the flow regulating plate on both the fixed roller side and the moving roller side according to the flow regulating plate opening adjustment range set value 2 in each silo material level detection cycle. When the material level in the silo is higher than the high set value, the control unit controls the control unit to increase the opening of the flow regulating plate on both the fixed roller side and the moving roller side according to the flow regulating plate opening adjustment range set value 2 in each silo material level detection cycle.

[0019] When the material level detection device detects that the material level in the silo is between the upper and lower limits, and when the roller gap detection device detects that the gap between the left and right sides is greater than the roller gap setting value plus the gap dead zone, the control unit reduces the opening of the flow regulating plate on the fixed roller side and the moving roller side once in each roller gap detection cycle. When the gap between the left and right sides is less than the roller gap setting value minus the gap dead zone, the control unit increases the opening of the flow regulating plate on the fixed roller side and the moving roller side once in each roller gap detection cycle.

[0020] The amount by which the flow regulating plate opening is increased or decreased is dynamically set by the control unit based on the actual roll gap and the set roll gap deviation.

[0021] Furthermore, the gap interlock adjustment also includes:

[0022] When it is determined that the material level in the silo is not in a downward trend and the material level in the silo is greater than the low set value of the material level in the silo plus the dead zone of the material level, the control unit increases the roller gap set value once in each material level detection cycle of the silo by the roller gap adjustment range of 1.

[0023] When it is determined that the material level in the silo is in a downward trend and the material level in the silo is greater than the low set value of the material level in the silo plus the dead zone of the material level, the control unit reduces the roller gap set value once in each material level detection cycle by the roller gap adjustment range of 1.

[0024] When it is determined that the material level in the silo has no upward or downward trend and the material level in the silo is greater than the low set value of the material level plus the dead zone of the material level, the control unit increases the roller gap set value once in each material level detection cycle of the silo according to the roller gap adjustment range of 2.

[0025] Furthermore, the gap interlock adjustment also includes:

[0026] When it is determined that the material level in the silo is not on an upward trend and the material level in the silo is less than the material level high setting value minus the material level dead zone, the control unit reduces the roller gap setting value once in each material level detection cycle by the roller gap adjustment range of 1.

[0027] When it is determined that the material level in the silo is on an upward trend and the material level in the silo is less than the material level high set value - material level dead zone, the control unit increases the roller gap set value once according to the roller gap adjustment range of 1 in each material level detection cycle of the silo.

[0028] When it is determined that the material level in the silo has no upward or downward trend and the material level in the silo is less than the material level high setting value - material level dead zone, the control unit reduces the roller gap setting value once in each material level detection cycle according to the roller gap adjustment range of 2.

[0029] Furthermore, the opening adjustment of the flow regulating plate is carried out within the alarm values ​​of the main motor current and the high roll gap. When the alarm value of the main motor current or the alarm value of the high roll gap occurs, the opening action of the flow regulating plate is immediately stopped and the flow regulating plate is adjusted back to the position before the current increase.

[0030] Furthermore, during the operation of the roller press, the manual / automatic switch button can be pressed to adjust relevant parameters in manual control mode.

[0031] Compared with existing technologies, the advantages of this invention are:

[0032] An automatic control system for a roller press simplifies the original sectional start-stop process to a one-button start-stop system. It also displays faults during the start-stop process for easy troubleshooting. During the operation of the roller press, the flow regulating plate opening is automatically interlocked with the material level in the hopper, the working roller gap, and the main motor operating frequency. The flow regulating plate and the main motor operating frequency are automatically adjusted according to the hopper level, keeping the working roller gap and hopper level within a stable range, greatly simplifying and reducing the operator's workload. Attached Figure Description

[0033] Figure 1 This is a block diagram of an automatic control system for a roller press;

[0034] Figure 2 A flowchart of a one-button start-up process for an automatic control system of a roller press;

[0035] Figure 3 This is a flowchart illustrating the interlocking control process for the opening of the flow regulating plate according to an embodiment of the present invention. Detailed Implementation

[0036] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0037] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0038] Example 1

[0039] Please see Figure 1-3 An automatic control system for a roller press includes:

[0040] Hydraulic oil station, reducer oil station, bearing oil station, main motor, feed pneumatic valve, flow regulating plate controller, silo level detection device, roll gap detection device, pressure detection device, opening detection device, and control unit for controlling the above components;

[0041] The control unit can automatically control the working roll gap of the roller press and the material level in the hopper within a stable range by controlling the flow regulating plate controller, the feed pneumatic valve, and the main motor.

[0042] In this embodiment, the control unit specifically performs the following control:

[0043] Click the one-click start button, and the control unit will automatically start the roller press and each auxiliary device in the following order:

[0044] Hydraulic oil station -> Fixed roller reducer oil station -> Moving roller reducer oil station -> Bearing oil station -> Fixed roller main motor cooling fan -> Moving roller main motor cooling fan -> Activate start warning bell -> Fixed roller main motor -> Moving roller main motor -> Open feed pneumatic valve;

[0045] Specifically, the startup process is as follows:

[0046] The control unit monitors the status of the roller press in real time. After receiving signals of no emergency stop without reset, no fault signal, all oil stations ready, main motor ready, and the rear discharge belt running, the operation mode is central control mode. Click the one-key start button.

[0047] The control unit starts the hydraulic oil station pump and detects the pump's operating status, hydraulic oil station temperature, and pressure on the left and right sides of the roller press. If any of the above statuses are abnormal, the control unit interrupts the start command and issues a hydraulic oil station abnormality alarm. After the abnormality is resolved, the one-key start button is clicked again to start the next level of equipment. If there is no abnormality, the next level of equipment will start automatically.

[0048] After the hydraulic oil station is running normally, the control unit starts the oil pump of the fixed roller reducer oil station and the oil pump of the moving roller reducer oil station after a delay and checks the status of the reducer oil station. If there is an abnormality, the control unit interrupts the start command and issues an abnormal alarm prompt for the fixed roller / moving roller reducer oil station. After the abnormality is cleared, click the one-key start button again to start the next level of equipment. If there is no abnormality, it will automatically start the next level of equipment.

[0049] After the oil station of the fixed roll / moving roll reducer is running normally, the control unit starts the bearing oil station pump after a delay and checks the status of the bearing oil station. If there is an abnormality, the control unit interrupts the start command and issues an abnormality alarm for the bearing oil station. After the abnormality is resolved, click the one-button start button again to start the next stage of equipment. If there is no abnormality, it will automatically start the next stage of equipment.

[0050] After the bearing oil station is operating normally, the control unit starts the cooling fans of the fixed roller main motor and the moving roller main motor after a delay and checks the status of the cooling fans. If any abnormality is found, the control unit interrupts the start command and issues an alarm for the main motor cooling fan. After the abnormality disappears, click the one-button start button again to start the next level of equipment. If there is no abnormality, it will automatically start the next level of equipment.

[0051] After the roller press oil system is normal, the control unit detects the roller gap position, left and right side pressure, and temperature at various points in the system. If the above data are within the normal range, the start warning bell will be automatically rung and the main motor of the fixed roller will be started after a delay. If the above data are higher than the alarm value, the control unit will interrupt the start command and issue a corresponding abnormal alarm. After the abnormality is handled, the one-key start button will be clicked again to start the main motor of the fixed roller.

[0052] After the fixed roller main motor starts, it detects the temperature and operating current of its various parts. If the above data are within the normal range, the moving roller main motor starts automatically. If the above data are higher than the alarm value, the control unit interrupts the start command and issues a corresponding abnormal alarm. After the abnormality is handled, the one-key start button is clicked again to start the moving roller main motor.

[0053] It should be noted that the above-mentioned fixed roll reducer oil station and moving roll reducer oil station are started simultaneously. Alternatively, depending on the different roll press models, they can be started in stages, i.e., the fixed roll reducer oil station is started first and then the moving roll reducer oil station is started after a delay.

[0054] The cooling fans of the fixed roll main motor and the moving roll main motor are started simultaneously. Alternatively, depending on the different roll press models, they can be started in stages, i.e., the cooling fans of the fixed roll main motor are started first and then the cooling fans of the moving roll main motor are started after a delay.

[0055] If an abnormal interruption occurs during the startup process of the above-mentioned device, the one-key start command will be interrupted at the current abnormal position. The device that is already in a normal startup state will not stop. After the abnormality is resolved, the one-key start button will be clicked again and the control unit will continue to start at the paused position.

[0056] The one-click shutdown process is performed in reverse order from the last step to the first step of the one-click start process.

[0057] In this embodiment, specifically, after the main motor of the roller press has started and there are no abnormalities, when the material level detection device of the hopper detects that the material level in the hopper is greater than (the set value of the material level in the hopper), the control unit controls the feed pneumatic valve to open and sends a roller press operation signal; when the material level in the hopper is less than (the lower limit value of the material level in the hopper) during the operation of the roller press, the control unit closes the feed pneumatic valve.

[0058] In this embodiment, specifically, after a certain delay after closing the feed pneumatic valve or after the main motor starting conditions are met when the roller press is started, the control unit adjusts the flow regulating plate to (set closed opening position) through the flow regulating plate controller, and restores the given operating frequency of the main motor to (initial setting value).

[0059] In this embodiment, specifically, after the feed pneumatic valve is opened, the control unit controls the flow regulating plate controller to increase the opening of the flow regulating plate on the fixed roller side and the moving roller side at intervals (the opening adjustment interval time during feeding) according to (the flow regulating plate opening adjustment range setting value 1), until the opening of the flow regulating plates on both sides detected by the opening detection device is greater than (the initial setting value of the flow regulating plate interlock opening).

[0060] After the opening of the flow regulating plates on both sides is greater than the initial setting value of the flow regulating plate interlock opening, the working parameters of the roller press are monitored for two minutes. After the roller gap detection device and the pressure detection device detect the roller gap and pressure stabilize, the gap interlock adjustment is activated.

[0061] In this embodiment, specifically, the gap interlock adjustment includes:

[0062] The material level in the silo is continuously sampled to determine whether it is rising or falling. When the material level is lower than the low setting value, the control unit controls the flow regulating plate controller to reduce the opening of the flow regulating plates on both the fixed and moving roller sides according to the adjustment range setting value 2 during each silo level detection cycle. When the material level is higher than the high setting value, the control unit increases the opening of the flow regulating plates on both the fixed and moving roller sides according to the adjustment range setting value 2 during each silo level detection cycle.

[0063] When the material level detection device detects that the material level in the silo is between the upper and lower limits, and when the roller gap detection device detects that the gap between the left and right sides is greater than (roller gap set value + gap dead zone), the control unit reduces the opening of the flow regulating plate on the fixed roller side and the moving roller side once in each (roller gap detection cycle). When the gap between the left and right sides is less than (roller gap set value - gap dead zone), the control unit increases the opening of the flow regulating plate on the fixed roller side and the moving roller side once in each roller gap detection cycle.

[0064] The amount by which the flow regulating plate opening is increased or decreased is dynamically set by the control unit based on the actual roll gap and the set roll gap deviation.

[0065] It should be noted that the roll gap setting value is not a fixed value. It is set as the initial roll gap setting value when the roller press is started. After the gap interlock adjustment is activated, it is automatically adjusted according to the material level in the hopper, and the upper and lower limits of the roll gap setting value are set according to the material extrusion effect of the roller press.

[0066] In this embodiment, specifically, the gap interlocking adjustment further includes:

[0067] Continuous sampling of material levels in the silo is used to determine whether the material level is trending upwards or downwards.

[0068] When it is determined that the material level in the silo is not in a downward trend and the material level in the silo is greater than (the low setting value of the material level in the silo) + (the dead zone of the material level), the control unit increases the roller gap setting value once in each (material level detection cycle) according to (roller gap adjustment range 1);

[0069] When it is determined that the material level in the silo is in a downward trend and the material level in the silo is greater than (the low setting value of the material level in the silo) + (the dead zone of the material level), the control unit reduces the roller gap setting value once in each (material level detection cycle) according to (roller gap adjustment range 1);

[0070] When it is determined that the material level in the silo has no upward or downward trend and the material level in the silo is greater than (the low setting value of the material level in the silo) + (the dead zone of the material level), the control unit increases the roller gap setting value once in each (material level detection cycle) according to (roller gap adjustment range 2).

[0071] In this embodiment, specifically, the gap interlocking adjustment further includes:

[0072] When it is determined that the material level in the silo is not on an upward trend and the material level in the silo is less than (the material level high setting value) - (the material level dead zone), the control unit reduces the roller gap setting value once in each (material level detection cycle) according to (roller gap adjustment range 1).

[0073] When it is determined that the material level in the silo is on an upward trend and the material level in the silo is less than (the material level high setting value) - (the material level dead zone), the control unit increases the roller gap setting value once in each (material level detection cycle) according to (roller gap adjustment range 1);

[0074] When it is determined that the material level in the silo has no upward or downward trend and the material level in the silo is less than (the material level high setting value) - (the material level dead zone), the control unit reduces the roller gap setting value once in each (material level detection cycle) according to (roller gap adjustment range 2).

[0075] It should be noted that excessive fluctuations in the roll gap will affect the operational stability of the roller press. Therefore, upper and lower limits should be set for the roll gap setting value, and no adjustment should be made if the roll gap setting value is outside the upper and lower limits.

[0076] It should be noted that, in order to prevent the flow regulating plate opening from being too small and affecting the extrusion effect, or the flow regulating plate opening from being too large and causing the main motor current or roller gap to be too high, upper and lower limits for flow opening adjustment are set, and the flow regulating plate opening is not adjusted outside the upper and lower limits.

[0077] It should be noted that the above-mentioned flow regulating plate opening adjustment is all performed within the main motor current alarm value and the roll gap high alarm value. When the main motor current high alarm or the roll gap high alarm occurs, the flow regulating plate opening action is immediately stopped and the flow regulating plate is adjusted back to the position before the current increase.

[0078] In this embodiment, specifically during the operation of the roller press, the manual / automatic switch button can be clicked to adjust relevant parameters in manual control mode.

[0079] In this embodiment, it should also be noted that the values ​​in parentheses above are parameter settings, which have default settings and can be adjusted appropriately according to different operating conditions.

[0080] Example 2

[0081] Example 2 is a further explanation of Example 1. The same components will not be described again here. The usage steps of the system are as follows:

[0082] 1. Based on the customer's on-site manual operation experience data, set the initial settings for the optimal flow regulating plate interlock opening, main motor frequency, flow opening adjustment upper and lower limits, roller gap setting upper and lower limits, hopper material level upper and lower limits, and current difference setting. The purpose is to prevent the controller from over-adjusting parameters during automatic adjustment, ensuring that the roller press operates within a stable range with the best extrusion effect.

[0083] 2. Click "One-click Start". The roller press and auxiliary equipment will start automatically in the following order:

[0084] Hydraulic oil station -> Fixed roller reducer oil station -> Moving roller reducer oil station -> Bearing oil station -> Fixed roller main motor cooling fan -> Moving roller main motor cooling fan -> Activate start warning bell -> Fixed roller main motor -> Moving roller main motor -> Open feed pneumatic valve.

[0085] 3. When the material level in the hopper is higher than the set material level, the feeding pneumatic valve opens and the system automatically adjusts the opening of the flow regulating plates on both sides to the target value and stabilizes for two minutes to make the data such as the roller gap, pressure, and main motor current of the roller press stable.

[0086] 4. Increase the feed rate at the front of the roller press to raise the hopper level. When the hopper level is greater than (hopper level set value) + (hopper dead zone), observe whether the opening of the flow regulating plates on both sides increases synchronously within the (hopper detection cycle) interval, and whether the corresponding roller gap and main motor operating frequency increase accordingly. After that, the hopper level drops and reaches a dynamic balance again.

[0087] 5. Reduce the feed rate at the front of the roller press to lower the hopper level. When the hopper level is less than (hopper level set value) - (hopper level dead zone), observe whether the opening of the flow regulating plates on both sides decreases synchronously within the (hopper detection cycle) interval, and whether the corresponding roller gap and main motor operating frequency decrease accordingly. After that, the hopper level rises again to reach a dynamic balance.

[0088] 6. During the process of the material hopper reaching dynamic balance, observe the trend of the roller gap on both sides of the roller press and the operating current of the main motor. If the roller gap and current fluctuate too much and the trend is continuous and winding, increase the (roller gap detection cycle) and (current detection cycle) accordingly. Conversely, if the process of the material hopper reaching dynamic balance is too slow, decrease the (roller gap detection cycle) and (current detection cycle) accordingly.

[0089] 7. Check the silo level trend. If the silo level fluctuates around the dead zone, increase the silo detection cycle. Repeat steps 4-7 several times to find the optimal parameter settings and fix them.

[0090] 8. Manual / Automatic Switching to Seamless Switching: If you need to manually adjust some parameters during the operation of the roller press, you can directly click the manual / automatic switching button to adjust the relevant parameters in manual control mode.

[0091] 9. When the roller press needs to be stopped, click the one-click stop button. The roller press and all auxiliary equipment will proceed in reverse order from the end to the beginning of the one-click start process until the oil system stops completely. The one-click stop of the system is then completed.

[0092] The embodiments described above merely illustrate specific implementation methods of this application, and while the descriptions are detailed, they should not be construed as limiting the scope of protection of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the technical solution of this application, and these modifications and improvements all fall within the scope of protection of this application.

[0093] This background section is provided to generally present the context of the invention. The work of the currently named inventors, the work to the extent described in this background section, and aspects of this section that did not constitute prior art at the time of application are neither expressly nor impliedly acknowledged as prior art to the invention.

Claims

1. An automatic control system for a roller press, characterized in that, include: Hydraulic oil station, reducer oil station, bearing oil station, main motor, feed pneumatic valve, flow regulating plate controller, silo level detection device, roll gap detection device, pressure detection device, opening detection device, and control unit for controlling the above components; The control unit can automatically control the working roll gap of the roller press and the material level in the hopper within a stable range by controlling the flow regulating plate controller, the feed pneumatic valve, and the main motor; After the feed pneumatic valve is opened, the control unit adjusts the opening interval time every time the material is fed, and at the same time, according to the set value of the flow regulating plate opening adjustment range 1, controls the flow regulating plate controller to increase the opening of the flow regulating plate on the fixed roller side and the moving roller side until the opening of the flow regulating plate on both sides detected by the opening detection device is greater than the initial set value of the flow regulating plate interlock opening. After the opening of the flow regulating plates on both sides is greater than the initial setting value of the interlock opening of the flow regulating plates, the working parameters of the roller press are monitored for two minutes. After the roller gap detection device and the pressure detection device detect the roller gap and pressure stabilize, the gap interlock adjustment is activated. The gap interlock adjustment includes: When the material level in the silo is lower than the low set value, the control unit controls the flow regulating plate controller to reduce the opening of the flow regulating plate on both the fixed roller side and the moving roller side according to the flow regulating plate opening adjustment range set value 2 in each silo material level detection cycle. When the material level in the silo is higher than the high set value, the control unit controls the control unit to increase the opening of the flow regulating plate on both the fixed roller side and the moving roller side according to the flow regulating plate opening adjustment range set value 2 in each silo material level detection cycle. When the material level detection device detects that the material level in the silo is between the upper and lower limits, and when the roller gap detection device detects that the gap between the left and right sides is greater than the roller gap setting value plus the gap dead zone, the control unit reduces the opening of the flow regulating plate on the fixed roller side and the moving roller side once in each roller gap detection cycle. When the gap between the left and right sides is less than the roller gap setting value minus the gap dead zone, the control unit increases the opening of the flow regulating plate on the fixed roller side and the moving roller side once in each roller gap detection cycle. The amount by which the flow regulating plate opening is increased or decreased is dynamically set by the control unit based on the actual roll gap and the set roll gap deviation. The gap interlock adjustment also includes: When it is determined that the material level in the silo is not in a downward trend and the material level in the silo is greater than the low set value of the material level in the silo plus the dead zone of the material level, the control unit increases the roller gap set value once in each material level detection cycle of the silo by the roller gap adjustment range of 1. When it is determined that the material level in the silo is in a downward trend and the material level in the silo is greater than the low set value of the material level in the silo plus the dead zone of the material level, the control unit reduces the roller gap set value once in each material level detection cycle by the roller gap adjustment range of 1. When it is determined that the material level in the silo has no upward or downward trend and the material level in the silo is greater than the low set value of the material level in the silo plus the dead zone of the material level, the control unit increases the roller gap set value once in each material level detection cycle of the silo according to the roller gap adjustment range of 2. The gap interlock adjustment also includes: When it is determined that the material level in the silo is not on an upward trend and the material level in the silo is less than the material level high setting value - material level dead zone, the control unit reduces the roller gap setting value once in each material level detection cycle by the roller gap adjustment range of 1. When it is determined that the material level in the silo is on an upward trend and the material level in the silo is less than the material level high set value - material level dead zone, the control unit increases the roller gap set value once in each material level detection cycle of the silo by the roller gap adjustment range of 1. When it is determined that the material level in the silo has no upward or downward trend and the material level in the silo is less than the material level high setting value - material level dead zone, the control unit reduces the roller gap setting value once in each material level detection cycle according to the roller gap adjustment range of 2.

2. The automatic control system for a roller press according to claim 1, characterized in that, The control unit operates as follows: Click the one-button start button, and the control unit will automatically start the roller press and each auxiliary device in the following order: Hydraulic oil station -> Fixed roller reducer oil station -> Moving roller reducer oil station -> Bearing oil station -> Fixed roller main motor cooling fan -> Moving roller main motor cooling fan -> Activate start warning bell -> Fixed roller main motor -> Moving roller main motor -> Open feed pneumatic valve.

3. The automatic control system for a roller press according to claim 2, characterized in that, When the material level detection device detects that the material level in the silo is greater than the set high material level value, the control unit controls the opening of the feed pneumatic valve and sends a roller press operation signal; when the material level in the silo is less than the lower limit value during the operation of the roller press, the control unit closes the feed pneumatic valve.

4. The automatic control system for a roller press according to claim 3, characterized in that, After a certain delay after closing the feed pneumatic valve or after the main motor starts when the roller press is turned on, the control unit adjusts the flow regulating plate to the set closing position through the flow regulating plate controller, and restores the given operating frequency of the main motor to the initial set value.

5. The automatic control system for a roller press according to claim 4, characterized in that, The flow regulating plate opening is adjusted within the alarm values ​​of the main motor current and the high roll gap. When the alarm value of the main motor current or the high roll gap occurs, the flow regulating plate opening action is stopped immediately and the flow regulating plate is adjusted back to the position before the current increase.

6. The automatic control system for a roller press according to claim 5, characterized in that, During the operation of the roller press, you can also click the manual / automatic switch button to adjust the relevant parameters in manual control mode.

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