Automatic feeding device for mixing bin

Abstract

The invention relates to the technical field of intelligent material conveying, in particular to an automatic feeding device for a mixing bin, materials in a storage bin are conveyed into the mixing bin through a spiral conveyor, and the instantaneous flow rate and humidity of the materials are obtained through a flow meter and a hygrometer in the conveying process; the feeding process is judged; when it is judged that the feeding process meets the standard, operation parameters of a mechanism in the current feeding process are maintained, and when it is judged that the feeding process does not meet the standard, an arch breaking mechanism is started or the rotating speed of a driving motor is reduced, so that the feeding process meets the standard; and after the arch breaking mechanism is started, determining to increase the rotating speed of the driving motor or record the working power of the current arch breaking mechanism based on the change condition of the instantaneous material flow detected again. By sensing the material state and carrying out real-time data analysis, relevant conveying parameters are dynamically regulated or an arch breaking mechanism is started, so that the reliability of the feeding process and the feeding efficiency are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of material intelligent conveying, and in particular to an automatic feeding device for a mixing bin. BACKGROUND

[0002] The existing feeding device for a mixing bin usually adopts a screw conveyor for feeding, and its core function is to realize the physical transfer of the material from a low position to a high position and from a storage point to a mixing bin. Such a device is usually composed of a driving motor, a spiral blade and a cylinder, and the feeding process is completed by the constant speed driving of the motor. This mode has significant limitations: on the one hand, it cannot real-time perceive the changes of the material properties (such as humidity, flow rate), and when the material humidity fluctuates due to batch, environment and other factors, it is easy to cause caking, blockage in the conveying pipe or arching of the material in the bin, affecting the stability of continuous production; on the other hand, the fixed speed conveying mode lacks self-adaptive adjustment capability and cannot dynamically optimize the feeding parameters according to the actual state of the material, which not only has high energy consumption, but also is difficult to meet the high requirements for material ratio and uniformity in modern fine production.

[0003] Chinese Patent Publication No. CN217296034U discloses a feeding device for a mixing bin, and in the related technical solution, the cylinder is folded to speed up the cleaning efficiency when cleaning; and when the height of the mixing bin differs, the inclination angle of the cylinder is adjusted to make the outlet side of the cylinder as close as possible to the mixing bin, so as to avoid the scattering of light materials due to wind force when conveying light materials, thereby causing waste of resources. Although this technical solution has improved the mechanical flexibility, it is still essentially a pure mechanical open-loop control means, which adjusts the feeding angle through a hydraulic rod to adapt to different bin bodies, but lacks online monitoring and intelligent decision-making capability for the conveying process itself, and cannot realize real-time perception of the material state and dynamic regulation of the conveying parameters during the feeding operation. Specifically, its control dimension is single, only focuses on the physical conveying path of the material, and does not consider multi-dimensional information such as material humidity, instantaneous flow rate and bin level, resulting in a rough and poor adaptive feeding process; when encountering material with abnormal humidity, the device cannot automatically identify the blockage risk and take measures, and still needs to rely on manual intervention for cleaning and adjustment, affecting the overall production efficiency, and the solution also lacks effective detection and arch breaking mechanism for common blockage problems such as "arch" and "mouse hole" in the bin, and cannot guarantee the continuous and stable supply of the material under complex working conditions.

[0004] Therefore, there is an urgent need for an automatic feeding solution that can integrate material state perception, real-time data analysis and intelligent linkage of the actuator, to dynamically adapt to changes in material properties, proactively prevent and handle blockage failures, and thereby improve the reliability, efficiency and intelligent level of the feeding process. SUMMARY

[0005] To this end, the application provides an automatic feeding device for a mixing bin to overcome the problem that the real-time sensing of material state and dynamic regulation of conveying parameters cannot be realized during the feeding operation in the prior art, thereby resulting in low reliability and feeding efficiency during the feeding process.

[0006] To achieve the above-mentioned object, the application provides an automatic feeding device for a mixing bin, comprising: a conveying mechanism, which comprises a screw conveyor, a storage bin arranged at the feeding end of the screw conveyor, and a driving motor for driving the screw conveyor, the discharging end of the screw conveyor being connected with the feeding port of the mixing bin and conveying the material into the mixing bin; an arch breaking mechanism arranged in the storage bin to break the arch of the blocked material in the storage bin; a detection unit arranged on the discharging path of the screw conveyor, comprising a flow meter for detecting the flow of the material during the conveying process and a humidity meter for detecting the humidity of the material, so as to obtain the instantaneous flow of the material and the humidity of the material; an analysis unit connected with the detection unit to determine whether the feeding process meets the standard based on the changes of the instantaneous flow of the material and the humidity of the material; an adjustment unit connected with the analysis unit, the conveying mechanism, and the arch breaking mechanism to determine the operating parameters of the mechanism involved in the current feeding process based on the determination result of the feeding process, or to determine the adjustment instruction for starting the arch breaking mechanism, or to reduce the rotating speed of the driving motor; wherein, after starting the arch breaking mechanism, the rotating speed of the driving motor is increased or the working power of the current arch breaking mechanism is recorded based on the changes of the instantaneous flow of the material.

[0007] Further, the analysis unit is also used to determine whether the feeding process is stable based on the comparison result of the instantaneous flow of the material and the instantaneous flow threshold value and the comparison result of the humidity of the material and the humidity threshold value; wherein, the analysis unit determines that the adjustment unit generates the adjustment instruction for starting the arch breaking mechanism or reduces the rotating speed of the driving motor in combination with the comparison result of the humidity of the material and the humidity threshold value in the case that the instantaneous flow of the material is less than or equal to the lower limit value of the instantaneous flow threshold value, or in the case that the instantaneous flow of the material is greater than the upper limit value of the instantaneous flow threshold value.

[0008] Further, the analysis unit determines that the adjustment unit reduces the rotating speed of the driving motor in the case that the instantaneous flow of the material is less than or equal to the lower limit value of the instantaneous flow threshold value and the humidity of the material is less than or equal to the lower limit value of the humidity threshold value. The analysis unit determines that the adjustment unit starts the arch breaking mechanism when the instantaneous flow of the material is less than or equal to the lower limit of the instantaneous flow threshold and the humidity of the material is greater than the upper limit of the humidity threshold. The analysis unit determines that the adjustment unit reduces the speed of the drive motor in a current-limiting manner when the instantaneous flow of the material is greater than the upper limit of the instantaneous flow threshold and the humidity of the material is less than or equal to the lower limit of the humidity threshold, wherein the reduction amplitude of the speed of the drive motor when the speed of the drive motor is reduced in a current-limiting manner is greater than the reduction amplitude of the speed of the drive motor when the speed of the drive motor is reduced in a current-maintaining manner. The analysis unit determines that the adjustment unit calibrates the flow meter and / or the humidity meter when the instantaneous flow of the material is greater than the upper limit of the instantaneous flow threshold and the humidity of the material is greater than the upper limit of the humidity threshold.

[0009] Further, the adjustment unit is further configured to determine to reduce the speed of the drive motor in a current-maintaining manner based on a comparison result of a humidity difference value and a preset humidity difference value, wherein the reduction amplitude of the speed of the drive motor is positively correlated with the humidity difference value, and the humidity difference value is a difference between the lower limit of the humidity threshold and the humidity of the material.

[0010] Further, the analysis unit is further configured to determine a corresponding processing based on a comparison result of a recovery time length and a preset recovery time length when the arch breaking mechanism is started and it is determined that the instantaneous flow of the material monitored by the detection unit recovers to be greater than the lower limit of the instantaneous flow threshold. When the recovery time length is less than or equal to the preset recovery time length, it is determined to record a working power of the arch breaking mechanism, and a preventive starting strategy is executed when the same humidity of the material is monitored in a next feeding process. When the recovery time length is greater than the preset recovery time length, it is determined to record the working power of the arch breaking mechanism, and it is determined to increase the working power of the arch breaking mechanism when the same humidity of the material is monitored in a next feeding process.

[0011] Further, the analysis unit is further configured to determine that the adjustment unit increases the speed of the drive motor based on an instantaneous flow difference value when the arch breaking mechanism is started for a preset time length and it is continuously determined by the detection unit that the instantaneous flow of the material is less than or equal to the lower limit of the instantaneous flow threshold, wherein the instantaneous flow difference value is a difference between the lower limit of the instantaneous flow threshold and the instantaneous flow of the material.

[0012] Further, the adjustment unit is further configured to determine to increase the speed of the drive motor based on a comparison result of the instantaneous flow difference value and a preset instantaneous flow difference value, wherein the increase amplitude of the speed of the drive motor is positively correlated with the instantaneous flow difference value.

[0013] Further, the adjusting unit is further used to reduce the driving motor speed in a flow limiting manner based on a comparison result of the instantaneous flow offset value and a preset instantaneous flow offset value, and the reduction amplitude of the driving motor speed is positively correlated with the instantaneous flow offset value, wherein the instantaneous flow offset value is a difference between the instantaneous flow of the material and an upper limit value in the instantaneous flow threshold.

[0014] Further, the detection unit further comprises a material level meter arranged in the storage bin to monitor the material inventory in the storage bin in real time, and the conveying mechanism further comprises a feeding valve arranged at the discharge end of the screw conveyor. The adjusting unit is further used to close the feeding valve in a case that the analysis unit determines that the feeding process does not meet the standard and the adjustment is invalid, or the material level meter monitors that the material inventory is less than or equal to a material inventory threshold.

[0015] Further, the analysis unit is further used to start the arch breaking mechanism in a case that the degree change rate of the material level meter is less than or equal to a first preset degree change rate.

[0016] Compared with the prior art, the automatic feeding device for the mixing bin has the beneficial effects that in the present application, the material in the storage bin is conveyed into the mixing bin by the screw conveyor, the instantaneous flow of the material and the material humidity are obtained by the flow meter and the humidity meter arranged respectively during the conveying process, and the feeding process is determined based on the change of the instantaneous flow of the material and the material humidity; when the feeding process meets the standard, the operation parameters of the related mechanisms involved in the current feeding process are determined; when the feeding process does not meet the standard, the arch breaking mechanism is started or the driving motor speed is reduced, so as to change the instantaneous flow of the material to make the feeding process meet the standard; and after the arch breaking mechanism is started, the driving motor speed is increased based on the change of the instantaneous flow of the material detected by the detection unit again or the working power of the current arch breaking mechanism is recorded as a next preventive arch breaking strategy. The present application determines the feeding process condition by integrating the material state sensing and real-time data analysis, dynamically adjusts and controls the related conveying parameters or starts the arch breaking mechanism while dynamically adapting to the change of the material characteristics, so as to improve the reliability, the feeding efficiency and the intelligent level of the feeding process.

[0017] Further, in the process of preliminary determination based on the instantaneous flow of the material and the instantaneous flow threshold, the moisture parameter of the material is introduced for multi-parameter fusion analysis, and a composite determination model is constructed by fusing the two types of key multi-source information of flow and humidity. First, preliminary determination is made based on the instantaneous flow of the material, and then secondary verification and correction are made in combination with the moisture of the material. The device can accurately respond to the real-time fluctuations of the material characteristics, so that high-precision state identification is completed before control is performed, and the accuracy and robustness of control are fundamentally improved.

[0018] Further, when it is determined that the driving motor needs to be reduced in speed for stability, the reduction amplitude can be accurately determined based on the comparison result of the humidity difference value and the preset humidity difference value; when it is determined that the driving motor needs to be reduced in speed for current limiting, the reduction amplitude can be accurately determined based on the comparison result of the instantaneous flow offset value and the preset instantaneous flow offset value, thereby realizing differentiated intelligent adjustment of the driving motor speed to improve the efficiency and reliability of the feeding process.

[0019] Further, after starting the arch breaking mechanism, the recovery time is determined when the instantaneous flow of the material is greater than the lower limit of the instantaneous flow threshold, and based on the comparison result of the recovery time and the preset recovery time, the current working power of the arch breaking mechanism is recorded as the preventive starting strategy that can be used next time, or the current working power of the arch breaking mechanism is increased, thereby realizing intelligent control of the feeding device to improve the feeding efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of the module of the automatic feeding device for the mixing bin in the application; Figure 2 It is a flowchart of the use method of the automatic feeding device for the mixing bin in the application; Figure 3 It is a logic determination diagram for determining based on the comparison result of the instantaneous flow of the material and the instantaneous flow threshold in the application; Figure 4 It is a logic determination diagram for determining based on the comparison result of the moisture of the material and the humidity threshold when the instantaneous flow of the material is less than or equal to the instantaneous flow threshold in the application; Figure 5 It is a logic determination diagram for determining based on the comparison result of the moisture of the material and the humidity threshold when the instantaneous flow of the material is greater than the instantaneous flow threshold in the application. DETAILED DESCRIPTION

[0021] In order to make the purpose and advantages of the application more clear and explicit, the application will be further described below in combination with examples; it should be understood that the specific examples described herein are only used to explain the application, and do not limit the application.

[0022] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. Those skilled in the art will appreciate that the embodiments are only used to explain the technical principles of the present application, and are not intended to limit the protection scope of the present application.

[0023] It should be noted that in the description of the present application, unless otherwise explicitly specified and limited, the term "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. Those skilled in the art can understand the specific meaning of the above-mentioned term in the present application according to the specific circumstances.

[0024] In the present embodiment, the application scenario for the feeding of the mixing bin includes the material conveying in feed mills and food powder processing plants, etc. Whether it is feed or food, it is necessary to put multiple raw materials into the mixing bin according to the accurate proportion, and the flow detection and control of the material is the basis for realizing the accurate proportioning. And the feed and food are sensitive to moisture, so it is also necessary to detect the humidity on the basis of the flow detection, and then comprehensively consider according to multiple dimension information, so as to dynamically adapt to the characteristic changes of the feed and food materials, actively prevent and handle the jam fault, so as to improve the reliability, efficiency and intelligent level of the feeding process.

[0025] Please refer to Figure 1 The module schematic diagram of the automatic feeding device for the mixing bin in the present embodiment is shown in FIG. 1. The device includes a conveying mechanism, an arch breaking mechanism, a detection unit, an analysis unit and an adjusting unit, wherein the conveying mechanism includes a screw conveyor, a storage bin, a driving motor and a feeding valve, and the detection unit includes a flow meter, a humidity meter and a material level meter.

[0026] In a specific embodiment, the material to be fed is pre-stored in the storage bin, and then the material is obtained from the storage bin through the feeding end of the screw conveyor, and the material is sent into the mixing bin from the discharging end through the rotation of the screw blade of the screw conveyor, wherein the material conveying speed of the screw conveyor is controlled by controlling the rotating speed of the driving motor. In the present embodiment, at least two sets of conveying mechanisms are provided, and the proportion of multiple raw materials put into the mixing bin is adjusted by controlling the conveying speed of the screw conveyor.

[0027] At the position where the storage bin is connected with the feeding end of the screw conveyor, the material changes from bulk flow to funnel flow, and is affected by the self-gravity, the internal friction between particles and the external friction with the bin wall. When these forces form an unstable balance, the material is prone to form a solid arch above the bin opening or a hollow hole along the bin wall, resulting in the material unable to slide normally. Therefore, an arch-breaking mechanism is arranged in the storage bin to prevent or break the bridging and plugging phenomenon of the material in the storage bin. The arch-breaking mechanism can be a bin wall vibrator or a mechanical stirrer. In other embodiments, if the arch-breaking mechanism is a bin wall vibrator, the bin wall vibrator can also be arranged on the outer wall of the storage bin.

[0028] During the conveying of the material, the flow meter and the humidity meter arranged by the detection unit detect the material respectively to obtain the parameters of the instantaneous flow Q and the humidity W of the material. Then, the analysis unit connected with the detection unit obtains the instantaneous flow Q and the humidity W of the material, and determines whether the feeding process meets the standard based on the change of the instantaneous flow Q and the humidity W of the material. When it is determined that the feeding process meets the standard, the adjusting unit determines to maintain the operating parameters of the involved equipment in the current feeding process. When it is determined that the feeding process does not meet the standard, the corresponding processing needs to be determined according to the instantaneous flow Q and the humidity W of the material: starting the arch-breaking mechanism or reducing the rotating speed of the driving motor; after starting the arch-breaking mechanism, the detection unit re-detects the instantaneous flow Q of the material continuously and determines the corresponding processing based on the change of the re-determined instantaneous flow Q of the material: increasing the rotating speed of the driving motor or recording the working efficiency of the current arch-breaking mechanism as a preventive strategy for directly starting the arch-breaking mechanism next time when the bridging and plugging occurs again.

[0029] The detection unit further comprises a material level meter, which obtains the material inventory M in the storage bin. The material level meter can be a weighing sensor installed on the supporting leg of the storage bin. A material inventory threshold M0 corresponding to the material inventory M is set, and M0 is exemplarily set as 20% of the capacity of the storage bin. The capacity of the storage bin can be set as 10 tons. If it is detected that M = 1.5 tons, it indicates that the pre-stored material in the storage bin cannot meet the subsequent feeding demand. At this time, the adjusting unit closes the feeding valve arranged at the discharge end of the screw conveyor, and sends a material supplement warning signal to the upper control system or the operator. If it is detected that M = 3 tons, it indicates that the current pre-stored material in the storage bin still meets the conveying demand. At this time, the feeding valve is not closed and the material is continuously conveyed by the screw conveyor. If the adjusting unit determines that the feeding process does not meet the standard based on the analysis of the analysis unit, and the analysis unit determines that the adjustment is invalid, the feeding valve is also closed.

[0030] Specifically, the degree change rate V is obtained by monitoring the degree in the material level gauge for 10s in a continuous cycle and performing average value calculation, and the degree change rate V represents the consumption speed of the material in the storage bin during the feeding process. A preset degree change rate V0 corresponding to the degree change rate V is set. In order to more accurately reflect the discharging state in the storage bin and the conveying state of the conveying mechanism, the preset degree change rate V0 can be divided into a first preset degree change rate V1 and a second preset degree change rate V2. For example, V1=0.8t / h and V2=2.5t / h. The comparison process based on V, V1 and V2 is as follows: In this embodiment, when the conveying mechanism and the storage bin are both in the running state, if V is less than or equal to V1, it indicates that the material level in the storage bin is too slow, at this time it can be determined that there is arching or outlet blockage in the storage bin, and the adjusting unit immediately starts the arch breaking mechanism and sends a warning. If V is greater than V1 and less than or equal to V2, it indicates that the material level in the storage bin is in a normal descending state, at this time the operating parameters of the conveying mechanism and the arch breaking mechanism involved in the current feeding process are maintained. If V is greater than V2, it indicates that the material level in the storage bin is too fast, at this time it can be determined that there is material leakage in the storage bin or abnormality in the conveying mechanism, and a warning is directly sent.

[0031] Please refer to Figure 2 It is a use flow diagram of the automatic feeding device for the mixing bin in this embodiment. The flow at least includes the following steps: S1: conveying the material in the storage bin to the mixing bin through the screw conveyor; S2: detecting the flow and humidity of the material through the flow meter and the humidity meter arranged on the discharge path, to obtain the instantaneous flow and humidity of the material; S3: determining the feeding process based on the change of the instantaneous flow and humidity of the material; S41: determining the operating parameters of the mechanism involved in the feeding process when the feeding process meets the standard; S42: determining to start the arch breaking mechanism arranged in the storage bin or to reduce the rotating speed of the driving motor when the feeding process does not meet the standard; S423: re-detecting the instantaneous flow of the material through the detection unit after starting the arch breaking mechanism, to determine to increase the rotating speed of the driving motor or to record the working efficiency of the current arch breaking mechanism based on the change of the re-determined instantaneous flow of the material.

[0032] Please refer to Figure 3As shown, it is the logic decision diagram of the determination based on the comparison result of the instantaneous flow of the material and the instantaneous flow threshold value in the embodiment. Specifically, an instantaneous flow threshold value Q0 corresponding to the instantaneous flow of the material Q is set, and the analysis unit preliminarily determines the feeding process based on the comparison result of the instantaneous flow of the material Q and the instantaneous flow threshold value Q0. Among them, the instantaneous flow threshold value Q0 is a range value; on the basis of the preliminary determination, another dimension parameter-material humidity W is introduced for secondary determination, and a humidity threshold value W0 corresponding to the material humidity W is set in the secondary determination process.

[0033] In a specific embodiment, in order to more accurately preliminarily determine the feeding process, the lower limit value Q1=6.0t / h in the instantaneous flow threshold value Q0 can be exemplarily set, and the upper limit value Q2=8.5t / h in the instantaneous flow threshold value Q0 is set, wherein the rated conveying capacity of the screw conveyor is 10t / h, and the comparison process based on Q and Q1 and Q2 is as follows: If Q is less than or equal to Q1, or Q is greater than Q2, it indicates that the current feeding process is abnormal, at this time, only the single parameter of the instantaneous flow of the material Q cannot accurately determine the abnormal reason and the corresponding processing method, and then a new parameter-material humidity W is introduced, and secondary determination is carried out on the basis of the preliminary determination. If Q is greater than Q1 and less than or equal to Q2, it indicates that the current feeding process meets the preset standard, and the feeding process of the material meets the needs of the mixing bin.

[0034] Please refer to Figure 4 and Figure 5 As shown, Figure 4 the logic decision diagram for determining based on the comparison result of the material humidity and the humidity threshold value when the instantaneous flow of the material is less than or equal to the instantaneous flow threshold value in the embodiment, Figure 5 the logic decision diagram for determining based on the comparison result of the material humidity and the humidity threshold value when the instantaneous flow of the material is greater than the instantaneous flow threshold value in the embodiment.

[0035] Specifically, when the analysis unit preliminarily determines the abnormal feeding process based on the comparison result of the material humidity W and the humidity threshold value W0, the adjusting unit generates corresponding adjusting instructions according to the determination result, and the instructions include reducing the rotation speed of the driving motor in the steady flow state, reducing the rotation speed of the driving motor in the flow limiting state, starting the arch breaking mechanism, and calibrating the flowmeter and / or the humidity meter.

[0036] In a specific embodiment, when the material is feed, in order to more accurately preliminarily determine the feeding process, the lower limit value W1=10% in the humidity threshold value W0 can be exemplarily set, and the upper limit value W2=14% in the humidity threshold value W0 is set, and the process of secondary determination based on W and W1 and W2 on the basis of the preliminary determination is as follows: If Q is less than or equal to Q1 and W is less than or equal to W1, it indicates that the current material is too dry, and the too dry material will cause "air pocket" or "self-flow" at the outlet of the storage bin, which cannot form a stable filling, and the efficiency of the screw conveyor to grab the material is reduced. At this time, in order to make the material have more time to accumulate and fill in the screw groove, the stability or the inhibitory reduction of the driving motor speed is needed, and then the filling coefficient is increased to make the material filling more stable, so as to improve the material flow per unit time.

[0037] If Q is less than or equal to Q1 and W is greater than W2, it indicates that the current material humidity is too high, and the too viscous material will cause the feeding process to be blocked or form a bridging phenomenon, and the arch breaking mechanism needs to be started to vibrate the material to prevent the material from being blocked by viscosity during conveying.

[0038] If Q is less than or equal to Q1 and W is greater than W1 and less than or equal to W2, it indicates that the current material humidity is normal, and the flowability problem caused by too wet or too dry material can be basically ruled out. At this time, the material instantaneous flow Q is not up to standard, which is an abnormality in the mechanical level, and is directly determined as equipment failure and executes the shutdown protection.

[0039] If Q is greater than Q2 and W is less than or equal to W1, it indicates that the current material is dry and has excellent flowability, so that the material enters the screw conveyor without any resistance and is conveyed into the mixing bin by the conveyor, resulting in a too high filling rate. The flow-reducing reduction of the driving motor speed is needed to reduce the pushing speed of the screw blade to compensate (correct) the current too high conveying amount, wherein the reduction amplitude of the flow-reducing reduction of the driving motor speed is greater than the reduction amplitude of the stability reduction of the driving motor speed.

[0040] If Q is greater than Q2 and W is greater than W2, it indicates that the current material humidity is too high. If the material instantaneous flow Q is out of standard at this time, it is determined that the current material conveying state is contradictory, and therefore, the flowmeter and / or the humidity meter need to be calibrated for re-monitoring.

[0041] If Q is greater than Q2 and W is greater than W1 and less than or equal to W2, it indicates that the current material humidity is normal, and the flowability problem caused by too wet or too dry material can be basically ruled out. At this time, the material instantaneous flow Q is out of standard, which is an abnormality in the control loop or the feeding source, and directly issues a diagnostic alarm to check the storage bin or the flowmeter and / or the humidity meter.

[0042] Specifically, the difference between the lower limit value W1 in the humidity threshold W0 and the material humidity W is calculated and recorded as a humidity difference D, a preset humidity difference D0 corresponding to the humidity difference D is set, and the adjustment unit compares the humidity difference D with the preset humidity difference D0 to determine the reduction amplitude of the driving motor speed. In order to more accurately determine the reduction amplitude, the preset humidity difference D0 can be divided into a first preset humidity difference D1 and a second preset humidity difference D2.

[0043] In the present embodiment, the greater the humidity difference D, the smaller the current material humidity W, indicating that the current material has a greater degree of drying, and the driving motor speed needs to be reduced more to improve the material grabbing efficiency of the screw conveyor. Therefore, the reduction amplitude of the driving motor speed is positively correlated with the humidity difference D. It should be noted that the motor speed is reduced to stabilize the flow and prevent fluctuations, not to significantly reduce the flow. Therefore, the reduction adjustment at this time is fine tuning. The first preset humidity difference D1 is set to 2.5%, and the second preset humidity difference D2 is set to 4%. The comparison process based on D, D1 and D2 is as follows: If D is less than or equal to D1, the adjustment unit generates a first motor speed adjustment instruction related to the reduction of the driving motor speed, and controls the driving motor to reduce by 5% based on the original speed according to the first motor speed adjustment instruction. If the original speed of the driving motor is 120 rpm, the reduced driving motor speed is 114 rpm. If D is greater than D1 and less than or equal to D2, the adjustment unit generates a second motor speed adjustment instruction related to the reduction of the driving motor speed, and controls the driving motor to reduce by 8% based on the original speed according to the second motor speed adjustment instruction. If D is greater than D2, the adjustment unit generates a third motor speed adjustment instruction related to the reduction of the driving motor speed, and controls the driving motor to reduce by 10% based on the original speed according to the third motor speed adjustment instruction.

[0044] It can be understood that in the present embodiment, during the fine tuning reduction of the driving motor speed, the reduction amplitude can also be set to other required values, for example, when D is greater than D2, the driving motor can be reduced by 9% based on the original speed. The adjusted driving motor will not reduce the material instantaneous flow Q.

[0045] Specifically, after the arch breaking mechanism is started, the analysis unit determines the recovery time H when the material instantaneous flow Q detected by the detection unit recovers to greater than the lower limit value Q1 in the instantaneous flow threshold Q0, and compares the recovery time H with a preset recovery time H0 to determine the corresponding processing.

[0046] In the embodiment, the preset recovery time H0 can be set as 20 seconds. If H is less than or equal to H0, it is determined that the deagglomeration is effective, the current deagglomeration parameters are maintained, and the working efficiency of the current deagglomeration mechanism is recorded. If the same material with the same property needs to be deagglomerated in the next feeding process, the current deagglomeration parameters are directly used as the preventive starting strategy to control the deagglomeration mechanism. If H is greater than H0, it is determined that the deagglomeration efficiency is insufficient, and the working power or the working time of the deagglomeration mechanism is increased when the same material with the same property needs to be deagglomerated in the next monitoring.

[0047] Specifically, within the preset time of starting the deagglomeration mechanism, the analysis unit determines to increase the driving motor speed when the instantaneous flow rate Q of the material detected by the detection unit is still less than or equal to the lower limit value Q1 in the instantaneous flow rate threshold Q0. The adjustment unit generates an instruction for increasing the driving motor speed based on the instantaneous flow rate difference K, wherein the instantaneous flow rate difference K is the difference between the lower limit value Q1 in the instantaneous flow rate threshold and the instantaneous flow rate Q of the material.

[0048] A preset instantaneous flow rate difference K0 corresponding to the instantaneous flow rate difference K is set. The adjustment unit compares the instantaneous flow rate difference K with the preset instantaneous flow rate difference K0 to determine the increase amplitude of the driving motor speed. In order to more accurately determine the increase amplitude, the preset instantaneous flow rate difference K0 can be divided into a first preset instantaneous flow rate difference K1 and a second preset instantaneous flow rate difference K2.

[0049] In the embodiment, the greater the instantaneous flow rate difference K is, the smaller the current instantaneous flow rate Q of the material is, which indicates that the material conveying efficiency in the current feeding process is lower, and the driving motor speed needs to be increased more to improve the conveying efficiency of the screw conveyor for the material. Therefore, the increase amplitude of the driving motor speed is positively correlated with the instantaneous flow rate difference K. K1 is set as 1.0 t / h and K2 is set as 1.8 t / h. The comparison process based on K, K1 and K2 is as follows: If K is less than or equal to K1, the adjustment unit generates a fourth motor speed adjustment instruction related to the increase of the driving motor speed, and controls the driving motor to increase by 10% based on the original speed according to the fourth motor speed adjustment instruction. If the original speed of the driving motor is 100 rpm, the driving motor speed after the increase is 110 rpm. If K is greater than K1 and less than or equal to K2, the adjustment unit generates a fifth motor speed adjustment instruction related to the increase of the driving motor speed, and controls the driving motor to increase by 20% based on the original speed according to the fifth motor speed adjustment instruction. If K is greater than K2, the adjustment unit generates a sixth motor speed adjustment instruction related to the increase of the driving motor speed, and controls the driving motor to increase by 30% based on the original speed according to the sixth motor speed adjustment instruction.

[0050] It can be understood that in the embodiment, the increase range of the driving motor speed can also be set to other required values, for example, when K is greater than K2, the driving motor speed is increased by 28% on the basis of the original motor speed. The increased driving motor speed will not have a negative impact on the feeding process.

[0051] Specifically, the difference between the instantaneous flow Q of the material and the upper limit value Q2 in the instantaneous flow threshold value Q0 is calculated and recorded as the instantaneous flow offset value J, a preset instantaneous flow offset value J0 corresponding to the instantaneous flow offset value J is set, and the adjustment unit compares the instantaneous flow offset value J with the preset instantaneous flow offset value J0 to determine the flow reduction range of the driving motor speed. In order to more accurately determine the reduction range, the preset instantaneous flow offset value J0 can be divided into a first preset instantaneous flow offset value J1 and a second preset instantaneous flow offset value J2.

[0052] In the embodiment, the greater the instantaneous flow offset value J, the greater the current instantaneous flow Q of the material, which indicates that the flowability of the material is too good, the screw conveyor supplies too much, and the driving motor speed needs to be reduced more to reduce the conveying speed of the output flow. Therefore, the reduction range of the driving motor speed is positively correlated with the instantaneous flow offset value J. It should be noted that the main purpose of reducing the speed at this time is to directly and effectively limit the flow, so the reduction range is large, and the first preset instantaneous flow offset value J1=0.3 t / h and the second preset instantaneous flow offset value J2=0.6 t / h are set as examples. The comparison process based on J, J1 and J2 is as follows: If J is less than or equal to J1, the adjustment unit generates a seventh motor speed adjustment instruction related to the motor speed reduction, and controls the driving motor to reduce 15% on the basis of the original speed according to the seventh motor speed adjustment instruction. If J is greater than J1 and less than or equal to J2, the adjustment unit generates an eighth motor speed adjustment instruction related to the motor speed, and controls the driving motor to reduce 25% on the basis of the original speed according to the eighth motor speed adjustment instruction. If J is greater than J2, the adjustment unit generates a ninth motor speed adjustment instruction related to the motor speed reduction, and controls the driving motor to reduce 40% on the basis of the original speed according to the ninth motor speed adjustment instruction.

[0053] It can be understood that in the embodiment, the reduction range of the driving motor speed can also be set to other required values, for example, when J is less than or equal to J1, the driving motor speed can also be reduced by 18% on the basis of the original motor speed. The reduced driving motor speed will not have a negative impact on the feeding process.

[0054] The technologies not mentioned in the above embodiments are applicable to the prior art. In the present embodiment, the material instantaneous flow threshold Q0 is determined in advance according to the capacity of the mixing bin, the mixing time of each batch, the process requirements, and the conveying parameters of the screw conveyor; the target material sample is humidified, and the processing characteristics and storage requirements of the material are determined, and then the conveying test is carried out on the experimental device or the actual equipment to determine the material humidity threshold W0 in advance; the remaining parameter thresholds or preset parameters can be determined by the pre-determined method. It can be understood that any one of the preset parameters or critical parameters in the present embodiment is not specifically limited, and the above values are not limited thereto, and the person skilled in the art can adjust the preset parameters or critical parameters according to the actual needs or the analysis of historical data or the use of the equipment.

[0055] So far, the technical solutions of the present application have been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. The person skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical solutions after the changes or replacements will fall within the protection scope of the present application.

Claims

1. An automated feeding device for a mixing silo, characterized in that, include: The conveying mechanism includes a screw conveyor, a storage bin located at the feed end of the screw conveyor, and a drive motor for driving the screw conveyor. The discharge end of the screw conveyor is connected to the feed inlet of the mixing bin to convey the material into the mixing bin. An arch-breaking mechanism is installed inside the storage silo to break up materials that are blocking the silo. The detection unit is located on the discharge path of the screw conveyor and includes a flow meter for detecting the flow rate of the material during the conveying process and a humidity meter for detecting the humidity, so as to obtain the corresponding instantaneous flow rate and humidity of the material. An analysis unit, connected to the detection unit, is used to determine whether the feeding process meets the standard based on the changes in the instantaneous flow rate and humidity of the material. An adjustment unit, which is connected to the analysis unit, the conveying mechanism and the arch-breaking mechanism respectively, is used to determine the operating parameters of the mechanisms involved in the current feeding process based on the judgment result of the feeding process, or to determine and generate an adjustment command to start the arch-breaking mechanism, or to reduce the speed of the drive motor. Specifically, after the arch-breaking mechanism is activated, the speed of the drive motor is increased or the current working power of the arch-breaking mechanism is recorded based on the change in the instantaneous flow rate of the material.

2. The automated feeding device for a mixing silo according to claim 1, characterized in that, The analysis unit is also used to determine whether the feeding process is stable based on the comparison results of the instantaneous flow rate of the material with the instantaneous flow rate threshold and the comparison results of the material humidity with the humidity threshold. Wherein, when the instantaneous flow rate of the material is less than or equal to the lower limit of the instantaneous flow rate threshold, or when the instantaneous flow rate of the material is greater than the upper limit of the instantaneous flow rate threshold, the analysis unit, in conjunction with the comparison result of the material humidity and the humidity threshold, determines that the adjustment unit generates an adjustment command to start the arch-breaking mechanism, or reduces the speed of the drive motor.

3. The automated feeding device for a mixing silo according to claim 2, characterized in that, When the instantaneous flow rate of the material is less than or equal to the lower limit of the instantaneous flow rate threshold and the material humidity is less than or equal to the lower limit of the humidity threshold, the adjustment unit is used to stabilize the flow and reduce the speed of the drive motor. If the instantaneous flow rate of the material is less than or equal to the lower limit of the instantaneous flow rate threshold and the material humidity is greater than the upper limit of the humidity threshold, the adjustment unit determines to activate the arch-breaking mechanism. When the instantaneous flow rate of the material is greater than the upper limit of the instantaneous flow rate threshold and the material humidity is less than or equal to the lower limit of the humidity threshold, the adjustment unit is used to restrict the flow and reduce the speed of the drive motor. When the drive motor reduces the speed in a flow-restricting manner, the reduction is greater than the reduction when the drive motor reduces the speed in a steady flow manner. When the instantaneous flow rate of the material is greater than the upper limit of the instantaneous flow rate threshold and the humidity of the material is greater than the upper limit of the humidity threshold, the adjustment unit is used to calibrate the flow meter and / or the humidity meter.

4. The automated feeding device for a mixing silo according to claim 3, characterized in that, The adjustment unit is also used to determine the flow stability reduction of the drive motor speed based on the comparison result of the humidity difference value and the preset humidity difference value. The reduction of the drive motor speed is positively correlated with the humidity difference value, wherein the humidity difference value is the difference between the lower limit value of the humidity threshold and the humidity of the material.

5. The automated feeding device for a mixing silo according to claim 3, characterized in that, The analysis unit is also used to start the arch-breaking mechanism and determine the recovery time required for the instantaneous flow rate of the material to recover to a lower limit value greater than the instantaneous flow rate threshold based on the detection unit's monitoring, and to determine the corresponding processing based on the comparison result between the recovery time and the preset recovery time; Specifically, if the recovery time is less than or equal to the preset recovery time, the current working power of the arch-breaking mechanism is recorded, and a preventive start-up strategy is executed when the same material humidity is detected during the next feeding process. If the recovery time is longer than the preset recovery time, the current working power of the arch-breaking mechanism is recorded, and if the same material humidity is detected during the next feeding process, the working power of the arch-breaking mechanism is increased.

6. The automated feeding device for a mixing silo according to claim 3, characterized in that, The analysis unit is also used to determine, within a preset time period after the arch-breaking mechanism is started, that the adjustment unit increases the speed of the drive motor based on the instantaneous flow rate difference, provided that the detection unit continuously monitors that the instantaneous flow rate of the material is still less than or equal to the lower limit of the instantaneous flow rate threshold. The instantaneous flow rate difference is the difference between the lower limit of the instantaneous flow rate threshold and the instantaneous flow rate of the material.

7. The automated feeding device for a mixing silo according to claim 6, characterized in that, The adjustment unit is also used to determine to increase the speed of the drive motor based on the comparison result between the instantaneous flow difference and the preset instantaneous flow difference, and the increase in the speed of the drive motor is positively correlated with the instantaneous flow difference.

8. The automated feeding device for a mixing silo according to claim 3, characterized in that, The adjustment unit is also used to limit the speed of the drive motor based on the comparison result of the instantaneous flow offset value and the preset instantaneous flow offset value. The reduction in the speed of the drive motor is positively correlated with the instantaneous flow offset value, wherein the instantaneous flow offset value is the difference between the instantaneous flow of the material and the upper limit of the instantaneous flow threshold.

9. The automated feeding device for a mixing silo according to claim 1, characterized in that, The detection unit also includes a level gauge installed in the storage silo for real-time monitoring of the material level in the storage silo, and the conveying mechanism also includes a feeding valve installed at the discharge end of the screw conveyor. The adjustment unit is also used to close the feeding valve when the analysis unit determines that the feeding process does not meet the standard and the adjustment is ineffective, or when the level gauge detects that the material inventory is less than or equal to the material inventory threshold.

10. The automated feeding device for a mixing silo according to claim 9, characterized in that, The analysis unit is also used to activate the arch-breaking mechanism when the rate of change of the level gauge is less than or equal to a first preset rate of change.

Images