CN115828471B - Conveying regulation and control method and system of grain bucket elevator - Google Patents
Conveying regulation and control method and system of grain bucket elevator Download PDFInfo
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Abstract
The invention relates to a method and a system for conveying and regulating a grain bucket elevator. The method for controlling the transportation of the grain bucket elevator firstly acquires an operation information table of the bucket elevator, builds a simple model of the bucket elevator, and then respectively simulates the transportation process of different types of grains on the bucket elevator by using a discrete element simulation technology, so as to obtain the casting track of each grain generated at different transportation speeds. And then determining the optimal casting track under the constraint of obeying the minimum feed back, further obtaining the optimal transportation speed and the corresponding rotation speed of the conveying motor, and defining different working modes for the bucket elevator. And finally, running corresponding working modes aiming at different types of grains. The conveying regulation and control method can carry out variable frequency speed regulation on the motor, the intelligent control bucket elevator operates at the optimal rotating speed, the situations of material returning, material impact on the shell, unstable running current and the like are effectively reduced, the grain conveying efficiency can be improved, and the safe operation of equipment is guaranteed.
Description
Technical Field
The invention relates to the technical field of grain storage and transportation, in particular to a method and a system for conveying and regulating a grain bucket elevator.
Background
Bucket elevator (bucket elevator) is a common material conveying device, and is suitable for vertically lifting various granular, powdery and small-sized materials, and is widely applied to storage and transportation of grains. Along with the diversification of grain types and diversification of grain transportation operations, people put forward higher requirements on grain transportation equipment.
At present, the transportation speed of the bucket elevator in the market is mostly fixed, and the transportation speed of the bucket elevator before delivery is generally designed and matched according to a single goods class. However, the conventional bucket elevator is various in grain types, and when different grain materials are lifted, the fixed running speed easily causes the problems of material return increase, material impact on the shell, unstable running current and the like, so that the actual operation efficiency of the bucket elevator is limited, and even the safe running of equipment is influenced.
Disclosure of Invention
Based on the above, the invention provides a method and a system for controlling the transportation of a grain bucket elevator, which are necessary to solve the technical problem that the transportation speed of the bucket elevator is single in the prior art, so that the transportation efficiency of various grain materials is limited.
The invention discloses a method for conveying and regulating a grain bucket elevator, which comprises the following steps:
s1: and acquiring an operation information table of the bucket elevator. The job information table includes: the characteristic parameters of the hopper of the bucket elevator, the type numbers of all grains to be conveyed, the characteristic parameters of each grain and the associated characteristic parameters between each grain and the hopper.
S2: and constructing a simplified model of the bucket elevator.
S3: based on the simplified model, taking various parameters in the operation information table as input quantities, and respectively carrying out discrete element simulation on the transportation process of each grain in the bucket elevator so as to obtain the casting track of each grain generated at different transportation speeds.
S4: setting the optimal throwing track of the bucket elevator during grain conveying. The constraint conditions of the optimal projection track are as follows: the grain content flowing into the discharge chute from the hopper is not less than a preset content, and meanwhile, the probability that grain and food particles collide with the shell of the bucket elevator in the flowing process is minimum is met.
S5: and taking the optimal casting track as a known parameter, and further calculating the optimal transportation speed of each grain when the optimal casting track is met according to the result of discrete element simulation.
S6: the optimal rotating speed corresponding to the different optimal transporting speeds of the transporting motor of the bucket elevator is obtained, and then the working mode corresponding to each grain is set for the transporting motor.
S7: and obtaining the type number of the current grain to be conveyed, and controlling the conveying motor to adjust to the corresponding working mode.
As a further improvement of the above, the characteristic parameters of the hopper include: poisson's ratio, shear modulus and density of the inner wall of the hopper. The characteristic parameters of each grain include: the recovery coefficient among grains, the average grain diameter, the static friction coefficient and the dynamic friction coefficient of grains. The associated characteristic parameters include: the recovery coefficient, static friction coefficient and dynamic friction coefficient of grain particles and the inner wall of the hopper.
As a further improvement of the scheme, the construction process of the simplified model of the bucket elevator is as follows: the shell, the conveyer belt, the head wheel and the hopper of the bucket elevator are reserved.
As a further improvement of the above-described scheme, the simulation conditions at the time of discrete element simulation include: neglecting the air resistance influence of grain movement, only considering collision force between grain and the inner wall of the hopper, and the grain stacking appearance in each hopper is consistent, and the loading number of grain is the same.
As a further improvement of the above scheme, the optimal projection track is determined according to the equipment parameters of the grain bucket elevator. The device parameters include: hopper type, discharge mode, nose wheel radius, and hopper leading edge radius.
As a further improvement of the scheme, a Hertz-Mindlin non-sliding contact model of EDEM software is adopted to perform discrete element simulation on the grain transportation process.
As a further improvement of the scheme, the conveying motor is protected in real time when the conveying motor is adjusted to a corresponding working mode. The method for protecting the conveying motor in real time comprises the following steps:
s61: and collecting the working current value of the conveying motor in real time.
S62: and judging whether the collected working current value is valid, if so, executing S63.
S63: it is determined whether the operating current value is greater than a motor current rating. If yes, the current difference between the operating current value and the motor current rating is taken as a first reference value and S64 is performed. If not, S65 is performed.
S64: the real-time rotation speed of the conveying motor is reduced according to the first reference value or a second reference value, and the process returns to S61. The magnitude of the rotation speed reduction value of the conveying motor is positively correlated with the magnitude of the first reference value or the second reference value.
S65: and judging whether the real-time rotating speed of the conveying motor is equal to the optimal rotating speed, if so, returning to S61 to continuously acquire the working current value in real time. If not, S66 is performed.
S66: and judging whether the real-time rotating speed of the conveying motor is larger than the optimal rotating speed. If so, the speed difference between the real-time rotational speed and the optimal rotational speed is taken as a second reference value and returned to S64. If not, taking the speed difference between the optimal rotation speed and the real-time rotation speed as a third reference value and executing S67.
S67: and (3) increasing the real-time rotating speed of the conveying motor according to the third reference value, and returning to S61.
As a further improvement of the above scheme, in S62, when the collected working current value is invalid, the process returns to S61 to continue the collection of the working current value in real time.
The invention also discloses a conveying regulation and control system of the grain bucket elevator, which adopts any conveying regulation and control method. The delivery regulation system comprises:
and the information acquisition module is used for acquiring the operation information table of the bucket elevator. The job information table includes: the characteristic parameters of the hopper of the bucket elevator, the type numbers of all grains to be conveyed, the characteristic parameters of each grain and the associated characteristic parameters between each grain and the hopper.
And the model construction module is used for constructing a simplified model of the bucket elevator.
The simulation module is used for carrying out discrete element simulation on the transportation process of each grain in the bucket elevator based on the simplified model and taking various parameters in the operation information table as input quantity, so as to obtain the casting track of each grain generated at different transportation speeds.
The track setting module is used for setting the optimal throwing track when the bucket elevator conveys grains. The constraint conditions of the optimal projection track are as follows: the grain content flowing into the discharge chute from the hopper is not less than a preset content, and meanwhile, the probability that grain and food particles collide with the shell of the bucket elevator in the flowing process is minimum is met.
The speed calculation module is used for taking the optimal casting track as a known parameter, and further calculating the optimal transportation speed of each grain when the optimal casting track is met according to the result of discrete element simulation. And
The mode setting module is used for obtaining the optimal rotating speed corresponding to the different optimal transporting speeds of the transporting motor of the bucket elevator, and further setting the working mode corresponding to each grain for the transporting motor. And
The adjusting module is used for acquiring the type number of the current grain to be conveyed and controlling the conveying motor to adjust to the corresponding working mode.
As a further improvement of the above, the conveyance regulating system further includes:
the current detection module is used for collecting working current values of the conveying motor of the bucket elevator in real time.
The adjusting module is further used for protecting the conveying motor in real time according to the working current value acquired in real time when the conveying motor is adjusted to the corresponding working mode.
Compared with the prior art, the technical scheme disclosed by the invention has the following beneficial effects:
1. according to the conveying regulation and control method of the grain bucket elevator, discrete element simulation analysis is carried out on different types of grains in the conveying process of the bucket elevator, so that working modes corresponding to the different types of grains are obtained, the motor is subjected to variable frequency speed regulation according to the collected motor working current value in the equipment operation process, the bucket elevator is intelligently controlled to operate at the optimal rotating speed, the situations of material returning, material impact on a shell, unstable running current and the like are effectively reduced, the conveying efficiency of the grains is improved, and the safe operation of the equipment is guaranteed. In addition, the provided overcurrent protection measures can detect whether the current of the equipment exceeds the rated maximum current value while maintaining the optimal rotating speed of the equipment, and prevent the equipment from being stopped due to overcurrent in the running process of the bucket elevator, and even cause equipment failure and safety problems.
2. The beneficial effects of the conveying regulation and control system of the grain bucket elevator are the same as those of the conveying regulation and control method of the grain bucket elevator, and are not repeated here.
Drawings
FIG. 1 is a step diagram of a method for controlling the transportation of a bucket elevator according to embodiment 1 of the present invention;
FIG. 2 is a simplified schematic diagram of a bucket elevator according to example 1 of the present invention;
FIG. 3 is a schematic diagram showing the analysis of the optimum trajectory in example 1 of the present invention;
FIG. 4 is a general flow chart of the method for controlling the transportation of the bucket elevator in the embodiment 1 of the present invention;
FIG. 5 is a flow chart of the intelligent algorithm of FIG. 4;
fig. 6 is a circuit diagram of a current transformer sampling circuit in embodiment 1 of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or/and" as used herein includes any and all combinations of one or more of the associated listed items.
Example 1
Referring to fig. 1, the present embodiment provides a method for controlling the transportation speed of a grain bucket elevator, which can be applied to an existing grain bucket elevator, so as to adaptively control the transportation speed when different types of grains are transported by the bucket elevator. The conveying regulation and control method comprises the following steps of S1-S7.
S1: and acquiring an operation information table of the bucket elevator. The job information table includes: the characteristic parameters of the hopper of the bucket elevator, the type numbers of all grains to be conveyed, the characteristic parameters of each grain and the associated characteristic parameters between each grain and the hopper.
In this embodiment, the characteristic parameters of the hopper may include: poisson's ratio, shear modulus and density of the inner wall of the hopper. The characteristic parameters of each grain may include: the recovery coefficient among grains, the average grain diameter, the static friction coefficient and the dynamic friction coefficient of grains. The associated characteristic parameters may include: the recovery coefficient, static friction coefficient and dynamic friction coefficient of grain particles and the inner wall of the hopper. The inner wall of the hopper of the common bucket elevator can be made of steel. In addition, the types of grains to be conveyed may include, but are not limited to, soybean, wheat, brown rice, corn, paddy, chaff, sorghum, and the like.
S2: and constructing a simplified model of the bucket elevator.
Referring to fig. 2, the construction process of the simplified model of the bucket elevator may be: the shell 1, the conveyer belt 2, the head wheel 3 and the hopper 4 of the bucket elevator are reserved.
S3: based on the simplified model, taking various parameters in the operation information table as input quantities, and respectively carrying out discrete element simulation on the transportation process of each grain in the bucket elevator so as to obtain the casting track of each grain generated at different transportation speeds.
In this embodiment, the Hertz-Mindlin non-sliding contact model of the EDEM software can be used to simulate the transportation process of grains, the EDEM software is supported by the Discrete Element Method (DEM), and the behaviors of rock, soil, gravel, crystal, tablets, grains and powder and the interactions of the behaviors with equipment under a series of operation and process conditions can be accurately simulated. Before simulating the discharge process, the following conditions may be given: and the influence of air resistance on particle movement is ignored, only collision forces among particles and between the particles and the inner wall of the hopper are considered, the stacking appearance of the particles in each hopper is basically consistent, and the loading number of the particles is approximately the same.
S4: setting the optimal throwing track of the bucket elevator during grain conveying. The constraint conditions of the optimal projection track are as follows: the grain content flowing into the discharge chute from the hopper is not less than a preset content, and meanwhile, the probability that grain and food particles collide with the shell of the bucket elevator in the flowing process is minimum is met.
In this embodiment, the optimal projection track means that grain particles in the hopper can flow to the discharge chute 5 shown in fig. 2 as much as possible in the track, and at the same time, as few as possible collision occurs with the shell of the bucket elevator, so that the occurrence of a backflow phenomenon can be reduced, that is, part of the particles rebound into the hopper after collision with the shell 1, grain accumulation in the hopper is avoided, the grain conveying operation efficiency is improved, the load of the conveying motor can be reduced, and the safe operation of conveying equipment is ensured.
Specifically, the optimal trajectory may be determined according to equipment parameters of the grain hopper lifter, which may include: material throwing angle, hopper type (deep, shallow, diaphragm, bottomless), discharge mode (gravity, mixed, centrifugal), head wheel radius and hopper leading edge radius. In this embodiment, the form of the material directly determines the discharging mode of the material, and a common rule is that the powdery material is discharged by centrifugal projection, the block material is discharged by gravity, and the different discharging modes determine the different hopper-type lifts. The centrifugal projection is mainly carried out by adopting a shallow bucket and an arc bucket, and the gravity is carried out by adopting a deep bucket.
The three discharging modes are different in the rotating speeds of the head wheels, and the rotating speed-polar distance formula of the head wheels is as follows:
hn 2 ＝A
wherein h is the polar distance of the centrifugal force of the head wheel; n is the rotation speed of the head pulley; a is a constant. The length of the polar distance h is changed by adjusting the rotating speed n, so that the working mode is changed. According to the length relation among the polar distance, the head wheel radius R and the hopper front edge radius R, the following discharging mode is carried out:
h > R, are of the gravity type.
R < h < R, is a hybrid.
h < r, is centrifugal.
Regarding the projection trajectory formula, assuming that the material speed is v, the motion trajectory formula satisfied after the material leaves the hopper is as follows:
wherein θ is the material throwing angle, namely the included angle between the material speed direction and the positive X-axis direction, and m is the material mass. Please refer to fig. 3, the actual material speed is determined by the relative speed v of the material and the hopper r The dragging speed v of the rotating hopper around the head wheel e Synthesizing; after the material is discharged, the material makes parabolic motion under the resultant force of gravity G and air resistance R. And (3) simulating the obtained casting curve, and combining the formulas to obtain the optimal casting speed value.
S5: and taking the optimal casting track as a known parameter, and further calculating the optimal transportation speed of each grain when the optimal casting track is met according to the result of discrete element simulation.
Because the casting track of each grain generated under different transport speeds is obtained in the steps, the mapping relation between the transport speeds of different types of grains and the casting track is obtained, and therefore, the casting track is substituted into a discrete element simulation model on the premise of planning the optimal casting track, and the casting speed when the optimal casting track is obtained, namely the optimal transport speed.
S6: the optimal rotating speed corresponding to the different optimal transporting speeds of the transporting motor of the bucket elevator is obtained, and then the working mode corresponding to each grain is set for the transporting motor.
In this embodiment, the motor rotation speed of each grain corresponding to the working mode is obtained through the calculation and can be stored in the control module of the bucket elevator in advance, and can be updated in real time through the form of the database, so that the optimal corresponding optimal working mode can be obtained through the simulation calculation even for the grains of new varieties, and the application range of the bucket elevator is effectively improved.
S7: and obtaining the type number of the current grain to be conveyed, and controlling the conveying motor to adjust to the corresponding working mode.
Referring to fig. 4, in this embodiment, when the conveying motor switches between different operation modes, variable frequency speed regulation is performed, and the rotation speed corresponds to the optimal rotation speed required by the corresponding grain. In the actual running process of the bucket elevator, the working current of the conveying motor of the bucket elevator can be monitored, the speed of the bucket elevator in the working mode is further adjusted by utilizing an intelligent algorithm, and therefore the working current of the equipment is ensured to stably run at the rated maximum current, and the normal running of the equipment is ensured.
Referring to fig. 5, the method for protecting the conveying motor in real time (i.e., intelligent algorithm) may include the following steps:
s61: and collecting the working current value of the conveying motor in real time.
S62: and judging whether the collected working current value is valid, if so, executing S63. When the operation current value is 0×ffff, the operation current value is disabled and discarded, and the process returns to S61 again to continue the real-time acquisition.
S63: it is determined whether the operating current value is greater than a motor current rating. If yes, the current difference between the operating current value and the motor current rating is taken as a first reference value and S64 is performed. If not, S65 is performed.
The motor current rating refers to the maximum current value that delivers the motor in maintaining a safe operating condition.
S64: the real-time rotation speed of the conveying motor is reduced according to the first reference value or a second reference value, and the process returns to S61. The magnitude of the rotation speed reduction value of the conveying motor is positively correlated with the magnitude of the first reference value or the second reference value, and can be reduced according to a preset proportion.
S65: and judging whether the real-time rotating speed of the conveying motor is equal to the optimal rotating speed, if so, returning to S61 to continuously acquire the working current value in real time. If not, S66 is performed.
S66: and judging whether the real-time rotating speed of the conveying motor is larger than the optimal rotating speed. If so, the speed difference between the real-time rotational speed and the optimal rotational speed is taken as a second reference value and returned to S64. If not, taking the speed difference between the optimal rotation speed and the real-time rotation speed as a third reference value and executing S67.
S67: the real-time rotating speed of the conveying motor is increased according to the third reference value, and S61 is returned; the magnitude of the rotation speed increasing value is positively correlated with the magnitude of the third reference value.
In addition, referring to fig. 6, in this embodiment, the working current of the conveying motor may be collected by a current detection module. Specifically, the extraction of the working current may be achieved by a current transformer sampling circuit as shown in the figure. In the circuit, the alternating voltage secondarily measured by the current transformer CT1 is rectified by a bridge rectifier consisting of D1-D4. The DC voltage smoothed by EC5 is sent to I-A/D port of CPU to make SCM make corresponding action, CPU detects working current of bucket elevator according to change of voltage signal. The larger the turns ratio of the current transformer, the better the current linearity it induces when operated at high currents.
In conclusion, according to the discrete element simulation analysis is carried out on the transportation process of different types of grains on the bucket elevator, the working modes corresponding to the different types of grains are obtained, the variable frequency speed regulation is carried out on the motor according to the collected motor working current value in the equipment operation process, the bucket elevator is intelligently controlled to operate at the optimal rotation speed, the transportation efficiency of the grains can be improved, and the safe operation of the equipment is guaranteed. In addition, the provided overcurrent protection measures can detect whether the current of the equipment exceeds the rated maximum current value while maintaining the optimal rotating speed of the equipment, and prevent the equipment from being stopped due to overcurrent in the running process of the bucket elevator, and even cause equipment failure and safety problems.
Example 2
The present embodiment provides a conveying control system of a grain bucket elevator, which can adopt the conveying control method in embodiment 1. The delivery regulation system comprises: the system comprises an information acquisition module, a model construction module, a simulation module, a track setting module, a speed calculation module, a mode setting module, an adjustment module and a current detection module.
The information acquisition module is used for acquiring an operation information table of the bucket elevator. The job information table includes: the characteristic parameters of the hopper of the bucket elevator, the type numbers of all grains to be conveyed, the characteristic parameters of each grain and the associated characteristic parameters between each grain and the hopper.
The model construction module is used for constructing a simplified model of the bucket elevator.
The simulation module is used for carrying out discrete element simulation on the transportation process of each grain in the bucket elevator based on the simplified model and taking various parameters in the operation information table as input quantity, so as to obtain the casting track of each grain generated at different transportation speeds.
The track setting module is used for setting the optimal throwing track when the bucket elevator conveys grains. The constraint conditions of the optimal projection track are as follows: the grain content flowing into the discharge chute from the hopper is not less than a preset content, and meanwhile, the probability that grain and food particles collide with the shell of the bucket elevator in the flowing process is minimum is met.
The speed calculation module is used for taking the optimal casting track as a known parameter, and further calculating the optimal transportation speed of each grain when the optimal casting track is met according to the result of discrete element simulation. And
The mode setting module is used for obtaining the optimal rotating speed corresponding to the conveying motor of the bucket elevator when the conveying motor is at different optimal conveying speeds, and further setting the working mode corresponding to each grain for the conveying motor.
The adjusting module is used for obtaining the type number of the current grain to be conveyed and controlling the conveying motor to adjust to the corresponding working mode.
The current detection module is used for collecting working current values of the conveying motor of the bucket elevator in real time.
The adjusting module is further used for protecting the conveying motor in real time according to the working current value acquired in real time when the conveying motor is adjusted to the corresponding working mode.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of the invention should be assessed as that of the appended claims.
Claims (7)
1. The method for conveying and regulating the grain bucket elevator is characterized by comprising the following steps:
s1: acquiring an operation information table of the bucket elevator; the job information table includes: the characteristic parameters of the hopper of the bucket elevator, the type numbers of all grains to be conveyed, the characteristic parameters of each grain and the associated characteristic parameters between each grain and the hopper;
s2: constructing a simplified model of the bucket elevator; s3: based on the simplified model, taking various parameters in the operation information table as input quantities, and respectively carrying out discrete element simulation on the transportation process of each grain in the bucket elevator so as to obtain the casting track of each grain generated at different transportation speeds;
s4: setting an optimal throwing track when the bucket elevator transports grains; the constraint conditions of the optimal casting track are as follows: the grain content flowing into the discharge chute from the hopper is not less than a preset content, and the probability that grain and food particles collide with the shell of the bucket elevator in the flowing process is minimum;
the setting method of the optimal projection track comprises the following steps:
the device parameters are determined as follows: material throwing angle, hopper type, discharging mode, head wheel radius and hopper front radius; the form of the material directly determines the discharging mode of the material: the powdery material adopts centrifugal casting for unloading, and the blocky material adopts gravity for unloading; the centrifugal casting discharge adopts a shallow bucket and an arc bucket, and the gravity discharge adopts a deep bucket;
according to the formula of the rotation speed-polar distance of the head wheel: hn (hn) 2 In the formula, h is the polar distance of the centrifugal force of the head wheel; n is the rotation speed of the head pulley; a is a constant; the length of the polar distance h is changed by adjusting the rotating speed n, so that the working mode is changed; according to the length relation among the polar distance, the head wheel radius R and the hopper front edge radius R, the following discharging mode is carried out: h is a>R is gravity type; r is (r)<h<R is a mixed type; h is a<r is centrifugal;
regarding the projection trajectory formula, the motion trajectory formula which is satisfied after the material leaves the hopper is as follows:
wherein θ is a material throwing angle, namely an included angle between a material speed direction and an X-axis positive direction, and m is a material mass;
the actual material speed is determined by the relative speed v of the material and the hopper r Velocity v of rotation of the material with the hopper around the head wheel e Synthesizing; after the material is discharged, the material makes parabolic motion under the resultant force of gravity G and air resistance, the simulation obtains a casting curve, and the casting curve is obtained by combining a motion trail equationAn optimal velocity value of the shot; obtaining the mapping relation between the transport speeds of different types of grains and the casting track thereof, and planning the optimal casting track;
s5: taking the optimal casting track as a known parameter, and further calculating the optimal transportation speed of each grain when the optimal casting track is met according to the result of discrete element simulation;
s6: obtaining the optimal rotation speed corresponding to the different optimal transport speeds of the transport motor of the bucket elevator, and setting the working mode corresponding to each grain for the transport motor;
s7: acquiring the type number of the current grain to be conveyed, and controlling the conveying motor to adjust to a corresponding working mode;
wherein, the characteristic parameters of the hopper include: poisson ratio, shear modulus and density of the inner wall of the hopper; the characteristic parameters of each grain include: the recovery coefficient among grains, the average grain diameter, the static friction coefficient and the dynamic friction coefficient of grains; the associated characteristic parameters include: the recovery coefficient, static friction coefficient and dynamic friction coefficient of grain particles and the inner wall of the hopper.
2. The method for controlling the transportation of a grain bucket elevator according to claim 1, wherein the simplified model of the bucket elevator is constructed by the following steps: the shell, the conveyer belt, the head wheel and the hopper of the bucket elevator are reserved.
3. The method for controlling and transporting a hopper elevator according to claim 2, wherein the simulation conditions for the discrete element simulation include: neglecting the air resistance influence of grain movement, only considering collision force between grain and the inner wall of the hopper, and the grain stacking appearance in each hopper is consistent, and the loading number of grain is the same.
4. The method for controlling and transporting grain bucket elevator according to claim 1, wherein discrete element simulation is performed on the transportation process of grains by adopting a Hertz-Mindlin non-sliding contact model of EDEM software.
5. The method for controlling and conveying a grain bucket elevator according to claim 1, wherein the conveying motor is protected in real time while the conveying motor is adjusted to a corresponding working mode; the method for protecting the conveying motor in real time comprises the following steps:
s61: collecting the working current value of the conveying motor in real time;
s62: judging whether the collected working current value is effective or not, if so, executing S63;
s63: judging whether the working current value is larger than a motor current rated value or not; if yes, taking the current difference between the working current value and the motor current rated value as a first reference value and executing S64; if not, executing S65;
s64: reducing the real-time rotating speed of the conveying motor according to the first reference value or the second reference value, and returning to S61; the magnitude of the rotating speed reduction value of the conveying motor is positively correlated with the magnitude of the first reference value or the second reference value;
s65: judging whether the real-time rotating speed of the conveying motor is equal to the optimal rotating speed, if so, returning to S61 to continuously acquire the working current value in real time; if not, executing S66;
s66: judging whether the real-time rotating speed of the conveying motor is larger than the optimal rotating speed; if yes, taking a speed difference value between the real-time rotating speed and the optimal rotating speed as the second reference value and returning to S64; if not, taking the speed difference between the optimal rotating speed and the real-time rotating speed as a third reference value and executing S67;
s67: the real-time rotating speed of the conveying motor is increased according to the third reference value, and S61 is returned;
in S62, when the collected working current value is invalid, the process returns to S61 to continuously collect the working current value in real time.
6. A delivery control system of a grain hopper elevator, characterized in that it employs the delivery control method according to any one of claims 1 to 5; the delivery regulation system comprises:
the information acquisition module is used for acquiring an operation information table of the bucket elevator; the job information table includes: the characteristic parameters of the hopper of the bucket elevator, the type numbers of all grains to be conveyed, the characteristic parameters of each grain and the associated characteristic parameters between each grain and the hopper;
the model construction module is used for constructing a simplified model of the bucket elevator;
the simulation module is used for carrying out discrete element simulation on the transportation process of each grain in the bucket elevator based on the simplified model and taking various parameters in the operation information table as input quantity, so as to obtain the casting track of each grain generated at different transportation speeds;
the track setting module is used for setting the optimal throwing track when the bucket elevator conveys grains; the constraint conditions of the optimal casting track are as follows: the grain content flowing from the hopper into the discharge chute is not less than the preset content, and the minimum probability that grain and food particles collide with the shell of the bucket elevator in the flowing process is met;
the speed calculation module is used for taking the optimal casting track as a known parameter, and further calculating the optimal transportation speed of each grain when the optimal casting track is met according to the result of discrete element simulation; and
the mode setting module is used for obtaining the optimal rotating speed corresponding to the different optimal transport speeds of the conveying motor of the bucket elevator, and further setting the working mode corresponding to each grain for the conveying motor; and
and the adjusting module is used for acquiring the type number of the current conveyed grain and controlling the conveying motor to adjust to the corresponding working mode.
7. The conveyor regulating system of a grain hopper elevator of claim 6, further comprising:
the current detection module is used for collecting the working current value of the conveying motor of the bucket elevator in real time;
the adjusting module is further used for protecting the conveying motor in real time according to the working current value acquired in real time when the conveying motor is adjusted to a corresponding working mode.
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