CN108043734B - Simulation method of cross belt sorting system and readable storage medium - Google Patents
Simulation method of cross belt sorting system and readable storage medium Download PDFInfo
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- CN108043734B CN108043734B CN201711288846.XA CN201711288846A CN108043734B CN 108043734 B CN108043734 B CN 108043734B CN 201711288846 A CN201711288846 A CN 201711288846A CN 108043734 B CN108043734 B CN 108043734B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C3/00—Sorting according to destination
- B07C3/02—Apparatus characterised by the means used for distribution
- B07C3/08—Apparatus characterised by the means used for distribution using arrangements of conveyors
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
Abstract
The embodiment of the invention discloses a simulation method of a cross belt sorting system and a readable storage medium. The method comprises the following steps: generating express items in a preset mode; setting parameters of express delivery equipment and express distribution logic; simulating the operation of leading in the express mail by an operator by using a preset function model; arranging a circulating operation track of the trolley, wherein a plurality of detection units are arranged in the circulating operation track; a plurality of grids and a bag collecting frame are arranged on the running track; and the express mail output from the bag collecting frame is destroyed. Through the simulation model, the influence of the cross belt sorting system on the final result can be verified. The whole simulation model has good compatibility, and corresponding influence factors can be added according to actual needs, so that data errors caused by fitting by adopting a simple mathematical function are reduced better.
Description
Technical Field
The invention relates to the technical field of logistics sorting equipment, in particular to a simulation method of a cross belt sorting system and a readable storage medium.
Background
Along with the rapid development of the express delivery industry, the requirement on the processing speed of the logistics e-commerce is higher and higher. Along with the rise of labor cost and the requirement of high-speed and accurate sorting of express packages, the automatic sorting system is widely popularized as a device capable of efficiently saving labor.
The cross belt sorting machine is taken as equipment for sorting express mails, and is favored by mass logistics enterprises due to high-efficiency and stable performance. Although the sorting machine can bring remarkable benefits for enterprises. The method has obvious and obvious effects on the improvement of efficiency and the reduction of cost. However, the specific achievable effect is not evaluated and predicted in an efficient manner before the device is officially implemented.
After the cross-band system is introduced, the influence on the existing sorting center, specific index parameters of equipment and how to deal with the change of the traffic in the future cannot be given by the existing logistics enterprises, equipment suppliers and enterprises. At present, most enterprises adopt simple mathematical formulas to estimate sorting efficiency, utilization rate of each device and personnel, power consumption and other parameters.
The applicant of the present invention found in the course of studying the prior art that: the estimation method using the simple mathematical formula has the following defects: firstly, the device cannot cope with various changing conditions, such as equipment failure and maintenance, instability of personnel operation and the like; secondly, only the specific functional module can be used as a center, and the mutual influence between the front end and the rear end, even the whole system, is ignored; thirdly, the pertinence is lacked, the same formula is blindly applied to trial calculation, the uniqueness of each site and project is neglected, and the method is extremely unilateral and limited.
Disclosure of Invention
In view of the above technical problems, embodiments of the present invention provide a simulation method for a cross-belt sorting system and a readable storage medium, so as to solve the problem that the existing cross-belt sorting system is difficult to estimate the sorting efficiency.
A first aspect of an embodiment of the present invention provides a method for simulating a cross-belt sorting system. The method comprises the following steps: generating express items in a preset mode; setting parameters of express delivery equipment and express distribution logic; simulating the operation of leading in the express mail by an operator by using a preset function model; arranging a circulating operation track of the trolley, wherein a plurality of detection units are arranged in the circulating operation track; a plurality of grids and a bag collecting frame are arranged on the circulating operation track; and the express mail output from the bag collecting frame is destroyed.
Optionally, the generation source of the generated express mail specifically includes:
setting the time and the number of the received express items each day; and representing the condition of express delivery entering the cross-belt sorting system by sample data with a predetermined probability distribution.
Optionally, the express delivery device comprises a production line consisting of a plurality of production line sections; the express delivery distribution equipment comprises an inclined belt distributor, a chute, an NC chute and a guide-in table; the inclined belt distributor is provided with a plurality of gates, each gate is connected with a group of sliding grooves, an NC sliding groove and a guide-in table in sequence, and express items are conveyed to the circulating operation track.
Optionally, the parameters of the express delivery apparatus include: position, size, turning radius, elevation height, descent height, linear velocity of the flow section and acceleration; the parameters of the express distribution equipment specifically comprise: capacity of the sliding groove and sliding speed of the sliding groove.
Optionally, the express delivery allocation logic specifically includes: adding distribution parameters, wherein the distribution parameters are positive integers; cyclically varying the value of said dispensing parameter in a range from 1 to M with a predetermined variation period; m is the number of gates; and determining the state of the gate according to the value of the distribution parameter.
Optionally, a plurality of grids and a bag collecting frame are arranged on the circulating operation track, and the method specifically includes:
arranging a time detection sensor for detecting the falling time of the express and a full package detection sensor for detecting the full package state of the express at the grid; the bag collecting frame is provided with an input end, a bag collecting capacity and state information after bag collecting.
Optionally, the method further comprises: setting corresponding numbers for each trolley and the grid; and the number information of the grid is corresponding destination information.
Optionally, the method further comprises: adjusting the speed of the trolleys, the number of the grids and the number of the lead-in tables; and counting and outputting corresponding express sorting efficiency information.
Optionally, the express item sorting efficiency information specifically includes: the output information of each running water section per unit time, the real-time express item accumulation amount and the maximum accumulation amount, the sorting amount of each grid and the lead-in amount of the lead-in platform.
A second aspect of embodiments of the present invention provides a non-transitory computer-readable storage medium, wherein the non-transitory computer-readable storage medium stores computer instructions for causing a processor to execute a simulation method of a cross-belt sorting system as described above.
The technical scheme provided by the embodiment of the invention provides a simulation model of a cross belt sorting system based on a simulation technology. Through the simulation model, the influence of the cross belt sorting system on the final result can be verified. The whole simulation model has good compatibility, and corresponding influence factors can be added according to actual needs, so that data errors caused by fitting by adopting a simple mathematical function are reduced better.
Drawings
FIG. 1 is a schematic diagram of one embodiment of a typical cross-belt sorting system;
FIG. 2 is a schematic diagram of one embodiment of a method for simulating a crossbelt sorting system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of one embodiment of a cross-belt sorting system having throughput that varies over time in accordance with an embodiment of the present invention;
fig. 4 is a schematic diagram of an embodiment of the cross-belt sorting system of the present invention showing the change of the inventory of the express items over time.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. As used herein, the terms "vertical," "horizontal," "left," "right," "upper," "lower," "inner," "outer," "bottom," and the like are used in an orientation or positional relationship indicated based on the orientation or positional relationship shown in the drawings for convenience in describing the present invention and to simplify the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
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 in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
Fig. 1 is a schematic diagram of a typical cross-belt sorting system. As shown in fig. 1, a general cross-belt sorting system can be roughly divided into three parts, namely a supply item input area, a sorting area and a packet output area, and specifically comprises the following devices: the production line 11, the oblique strip distributor 12, the chute 13, the NC chute 14, the lead-in table 15, the trolley track 16, the trolley 17, the gray scale 18, the bar code scanner 19, the grid 20 and the collecting and enveloping line 21.
The specific express mail sorting process is roughly as follows: the items coming from the unloading zone are fed into the sorting area via the supply line 11. Falls through the inclined belt distributor into the chute. And the operator selects the express items in the sliding groove, takes out the oversized or special-shaped express items from the sliding groove and places the oversized or special-shaped express items into the NC sliding groove. The rest are placed in the corresponding piece sections on the lead-in table.
After accelerating the express to the speed synchronous with the trolley, the lead-in platform leads the express to the trolley stably. The trolley carries the express mail to run on the trolley track, and after the destination of the express mail is determined by the scanner 19, the express mail is thrown into the corresponding grid 20, so that the sorting operation of the express mail is completed.
Each compartment is provided with a corresponding full package detection device, and when the capacity of the express mail in the compartment is full, the compartment can be temporarily closed to stop the express mail from entering. The operator replaces the bag with a new bag and reopens the cell. And the bag collecting bags with full bags can be attached with corresponding labels or sealing strips, pushed to corresponding bag collecting lines, conveyed to a temporary storage area or a vehicle discharging area and waiting to be conveyed to a destination.
In a cross-belt sortation system, the sortation transport of the dispatch is accomplished by an endless cart track 16 and a plurality of carts 17 that travel along the cart track. The trolley rails 16 can be set according to the factory or the actual situation. The carriages 16 circulate on the conveyor track at a predetermined speed.
In order to ensure the normal operation of the sorting system, two actions of entering the express item from the import platform to the trolley and throwing the express item from the trolley to the grid are required to be smoothly realized. When the express is moved on the lead-in table, the lead-in table can communicate with the trolley.
On one hand, after the target trolley is determined by the lead-in platform, the express is accelerated to the speed synchronous with the trolley, so that the express is stably led into the trolley. On the other hand, when the trolley bears the express mail and is about to reach the target grid opening position, the system can start the throwing belt on the trolley in a delayed mode through the sensor, and the express mail is driven to move along the direction perpendicular to the rail running direction of the trolley through the belt and is thrown into the corresponding grid opening.
In addition, the situation that the express item bar code cannot be identified easily occurs in the sorting process. These couriers are typically scanned and identified again after one more revolution of the cart on the cart track. If the part cannot be identified, the part is thrown to the uniform abnormal grid, and sorting is carried out in a manual mode.
In the cross belt sorting system, the corresponding quantity of the lead-in tables and the grid openings can be arranged along the trolley track according to the actual production requirement, and the parameters such as the quantity of the trolleys running on the trolley track, the running speed of the trolleys and the like can be further adjusted, so that the sorting efficiency of the whole sorting system is improved as much as possible and is matched with the sorting requirement.
Fig. 2 is a flowchart of a method for simulating a cross-belt sorting system according to an embodiment of the present invention. The method is based on simulation, and realizes express sorting simulation of the cross belt sorting system. The model obtained by the simulation method is matched with the real express sorting, so that a real and reliable basis can be provided for the use of the cross belt sorting system, and the use effect of the cross belt sorting system is verified.
In some embodiments, before the simulation of the cross-belt sorting system is performed, in order to improve the simulation effect as much as possible and approach the real situation of the cross-belt sorting system, the site layout of the system may be simplified first, after the basic location information is obtained, the location information of each device (e.g., the lead-in table, the cell or the trunk, etc.) in the system is determined according to the correlation relationship, and the devices are arranged at the locations.
As shown in fig. 2, the method comprises the steps of:
210. and generating the express mail in a preset mode.
In cross-belt sortation systems, the couriers that are generated daily or that enter the sortation center are the targets of the sortation. Obviously, there will be corresponding differences between the express sorting jobs faced by different sorting centers. Firstly, corresponding sorting tasks are required to be set for a cross belt sorting system, and express items to be sorted according with normal rules are generated.
In some embodiments, the generation mode of the dispatch can be determined by the following method. Firstly, according to the statistical data of the sorting centers, the number of the express items received by each sorting center in different time periods every day is determined, and the number and the time of the generated express items are correspondingly set.
Express conditions entering the cross-belt sorting system are then represented with a predetermined probability distribution based on historical empirical data, expert knowledge, or the like. The express mail condition comprises the destination of the express mail, the size of the express mail, the probability of appearance of a special-shaped mail and the like.
The express mail condition is represented by introducing corresponding probability distribution, the production and processing processes of NC (numerical control) mails and abnormal mails can be simulated, so that the generated express mail to be sorted can better simulate the actual express mail sorting task, and finally obtained data is more real and reliable.
220. And setting the parameters of the express delivery equipment and the express distribution equipment and express distribution logic.
As shown in figure 1, the express delivery equipment is a production line consisting of a plurality of production lines. And the express distribution equipment comprises an inclined belt distributor, a chute, an NC chute and a guide-in table. The inclined belt distributor is provided with a plurality of gates, each gate is sequentially connected with a group of sliding grooves, NC sliding grooves and a guide-in table, and the express items are conveyed to the circulating operation track through the guide-in table, so that the express items on the assembly line are distributed to different trolleys.
According to the design of the cross belt sorting system, the same position, size, turning radius, rising height, falling height, linear speed and acceleration of a flow section can be set in a model simulating the cross belt sorting system, and the model is used for simulating express delivery equipment. The parameters required to be set by the express distribution equipment comprise: the capacity of the chute, the gliding speed of the chute and the like. The speed of the sliding chute can be detected by a corresponding sensor.
The express distribution logic is a control logic which needs to be preset and is used for determining distribution of the express through the inclined belt distributor and outputting the express through which gate and chute. By setting express distribution logic, express can be efficiently conveyed to the trolley.
In some embodiments, the dispatch logic may be configured as follows:
firstly, adding a distribution parameter for the gate, wherein the distribution parameter is a positive integer. Then, cyclically changing the value of the allocation parameter in a range of 1 to M at a predetermined change period; m is the gate number. And finally, determining the state of each gate according to the value of the distribution parameter. In the present embodiment, the state of the shutter is two states of opening and closing. The gate number corresponding to the distribution parameter is in an open state, and the other gates are in a closed state. Therefore, the express delivery can slide into the corresponding sliding groove through the corresponding gate according to the currently opened gate.
In addition, different parameters are set according to the actual length, speed, acceleration and deceleration and inclination angle of each section of the import platform, and meanwhile, according to the control logic of the PLC, the induction logic of acceleration and deceleration is set in each section according to the position information of the express on the import platform and the result of communication with the trolley.
230. And simulating the operation of leading in the express mail by the operator according to a preset function model.
In the express sorting process, an operator is required to conduct the import operation on the express, so that the problem that the sorting system cannot normally operate due to irregular or oversized objects is avoided. In order to realize complete simulation, the working time and scheduling information of an operator and the judgment logic corresponding to the operator need to be set, and whether the express delivery can be loaded or not is judged according to the express delivery condition on the import platform.
In this embodiment, the working time of the operator can be represented by a corresponding probability statistical function to represent the unstable factors existing in the personnel, so that the simulation effect is closer to the actual sorting efficiency.
The fluctuation of shift information and manual operation time is considered in the operator simulation process, the number of operators needed by a site and the efficiency and the workload of each corresponding operator can be quickly analyzed from the model, and the human effect data analysis is more reasonable.
240. A circulating operation track of the trolley is arranged, and a plurality of detection units are arranged in the circulating operation track.
A plurality of trolleys which run circularly exist on the circulating running track and are used for loading the express to corresponding grids so as to realize the sorting of the express. The setting of the circular operation track can set the information of the position, the size and the like which are the same as those of the actual cross belt sorting system according to the information on the actual design layout. And a trolley empty detection sensor, a scanner and a trolley coming detection sensor of the lead-in platform and the grid are respectively arranged at the corresponding positions of the circulating operation track. The car needs to set the speed and capacity information of the operation.
250. And a plurality of grids and a bag collecting frame are arranged on the circulating operation track.
The grid and the bag collecting rack are used for final sorting output of the express mail. The grid opening is sleeved with a bag collecting bag used for containing express items falling from the grid opening.
Specifically, in the setting process, a unique slot number needs to be set for each slot, and the slot number corresponds to the destination information. In addition, each grid is provided with a time detection sensor for detecting the falling time of the express and a full package detection sensor for detecting the full package state of the express. The packet collecting frame needs to set an input end, a packet collecting capacity and state information after packet collecting.
The full package detection amount of the sensor can be fitted through statistical data to generate different full package amounts so as to be closer to the actual condition.
260. And the express mail output from the bag collecting frame is destroyed.
After the express items are sorted and output from the collecting and packaging line, the express items can be absorbed and destroyed by an absorber of the model, so that the operating memory occupied by the express items is released, and the operating speed of the model is increased.
As can be seen from the above simulation method, for the simulated cross-belt sorting system, the common global variables include: the number of the trolleys, the running speed of the trolleys, the number of the grids and the number of the lead-in units are four. By adjusting the global variables, corresponding sorting efficiency information and express sorting process simulation can be obtained, so that corresponding bases are provided for debugging and the like of the cross belt sorting system in daily use.
During the simulation, the information that can be statistically output includes: the output information of each running water section per unit time, the real-time express item accumulation amount and the maximum accumulation amount, the sorting amount of each grid and the lead-in amount of the lead-in platform. The information output by statistics can be displayed by forms or graphs and the like, and the running state and the sorting efficiency of the cross belt sorting system are displayed.
The model building process (or simulation process) of the cross-belt sorting system is set forth in detail below in conjunction with detailed control logic settings. In this embodiment, the model numbers of the cross-belt sortation system include cart numbers and lot numbers. Each trolley is provided with a unique code, and serial numbers from 1 to N are sequentially set. The grids are set to be corresponding grid numbers according to different destination information of the express, and the grid numbers are 1 to N in sequence.
(1) Model initialization setting:
(2) cell creation and placement
(3) Diagonal tape dispenser dispensing logic settings
Adding a parameter nn, setting the parameter nn into a shaping mode, adding a Generator object, periodically changing the value nn, and judging the opening and closing of a corresponding valve of the oblique belt distributor according to the change of the value nn by a sensor on the oblique belt distributor.
(4) Import desktop express import logic setup
(sensorID: integer; Front: boilean)/. sensorID is the number of the incoming vehicle detection sensor corresponding to the introduction table on the track)
(5) Gripper projectile logic setup
(sensorID: integer; Front: boilean)/. sensorID is the number of the coming vehicle detecting sensor corresponding to the grid on the track)
(6) Full pack collection logic setup
And setting logic for full packet detection at an output port of the trellis.
(7) Information statistics logic setup
And counting output and temporary storage data of each section, and counting and refreshing once at fixed time intervals according to needs.
It should be noted that the setting and control rules of the control logic disclosed in the above method embodiments may also be implemented by using other suitable simulation software to achieve the same functions, and are not limited to the SimTalk language provided in the embodiments of the present invention.
When the output result is finally displayed, in order to visually display the output data and the change condition of the express mail storage accumulation, chart elements in a user interface can be added in the model, and data to be counted by the chart, the type of the chart, the display style of the chart, the coordinate axis, the title information and the like are set. In some embodiments, as shown in FIG. 3, for each run per hour throughput and WIP deposit variation, the type of graph may be set to be linear, with a corresponding data statistics graph for throughput. As shown in FIG. 4, a WIP buffer data table for each segment is shown.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a general hardware platform, and certainly can also be implemented by hardware. It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, which can be stored in a computer readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
In summary, the simulation method for the cross-belt sorting system according to the embodiment of the present invention can add data such as fault data and maintenance time of each equipment to the equipment in the model, reflect the real operation status of the equipment, and reduce the error of the empirical setting through function fitting for unstable parameters such as personnel operation. In addition, front-end and back-end processes can be added to the input and output ports of the model, and the system studies the operation conditions of the whole sorting system including the entering port and the leaving port.
In the sorting simulation process of the whole model, data can be collected in real time, dynamic display is matched, the running condition of each device in the whole field can be visually known, and the place where the problem occurs is found. After the model is built, aiming at different fields and projects, the logic of the entity can be created through the cooperation of global variables, the modification and the perfection can be carried out quickly, and the applicability is strong.
It should be understood that the technical solutions and concepts of the present invention may be equally replaced or changed by those skilled in the art, and all such changes or substitutions should fall within the protection scope of the appended claims.
Claims (9)
1. A method of simulating a cross-belt sortation system, comprising:
generating express items in a preset mode;
setting parameters of express delivery equipment and express distribution logic;
simulating the operation of leading in the express mail by an operator by using a preset function model;
arranging a circulating operation track of the trolley, wherein a plurality of detection units are arranged in the circulating operation track;
a plurality of grids and a bag collecting frame are arranged on the circulating operation track;
destroying the express mail output from the parcel shelf, wherein the express mail is generated in a preset mode, and the method specifically comprises the following steps:
setting the time and the number of receiving the express mails every day according to the statistical data;
express conditions of express items entering the cross-belt sorting system are represented by a predetermined probability distribution.
2. The method of claim 1, wherein the shipment equipment comprises a flow line comprised of a number of flow sections;
the express delivery distribution equipment comprises an inclined belt distributor, a chute, an NC chute and a guide-in table; the inclined belt distributor is provided with a plurality of gates, each gate is connected with a group of sliding grooves, NC sliding grooves and a guide-in table in sequence, and express items are conveyed to the circular operation track through the guide-in table.
3. The method of claim 2, wherein the parameters of the courier delivery apparatus include: position, size, turning radius, elevation height, descent height, linear velocity of the flow section and acceleration; the parameters of the express distribution equipment specifically comprise: capacity of the sliding groove and sliding speed of the sliding groove.
4. The method according to claim 2, wherein the dispatch logic specifically comprises:
adding distribution parameters, wherein the distribution parameters are positive integers;
cyclically varying the value of said dispensing parameter in a range from 1 to M with a predetermined variation period; m is the number of gates;
and determining the state of each gate according to the value of the distribution parameter.
5. The method according to claim 2, wherein the arranging of the plurality of gates and the bag collecting rack on the circulating orbit specifically comprises:
setting a unique grid number for each grid, wherein the grid number corresponds to the destination information;
each grid opening is provided with a time detection sensor for detecting the falling time of the express mail and a full package detection sensor for detecting the full package state of the express mail;
and arranging an input end, a collection capacity and state information after collection and packaging on the collection and packaging frame.
6. The method of claim 5, wherein the detection unit comprises:
the system comprises a scanner for scanning express information, an incoming vehicle sensor for detecting running information of a trolley and an empty vehicle detection sensor for detecting loading conditions of the trolley;
the incoming vehicle sensors are respectively arranged at the positions where the grid and the guide-in platform are connected with the circulating operation track, the empty vehicle sensors are arranged at the guide-in platform, and the scanner is arranged at a preset position of the circulating operation track.
7. The method of claim 5, further comprising:
adjusting the speed of the trolleys, the number of the grids and the number of the lead-in tables;
and counting and outputting corresponding express sorting efficiency information.
8. The method according to claim 7, wherein the express item sorting efficiency information specifically includes:
the output information of each running water section per unit time, the real-time express item accumulation amount and the maximum accumulation amount, the sorting amount of each grid and the lead-in amount of the lead-in platform.
9. A non-transitory computer-readable storage medium storing computer instructions for causing a processor to perform the method of simulating a cross-belt sorting system according to any one of claims 1-8.
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