Logistics node layout method and system for agricultural product cold chain

Abstract

The invention relates to the related field of logistics management, and discloses a logistics node layout method and system for an agricultural product cold chain, which perform scheduling management of logistics tasks based on supply and demand conditions of agricultural products among different cities, ensure high utilization rate of transportation capacity of logistics vehicles in a cyclic transportation process, and improve the transportation efficiency of the logistics vehicles. Agricultural products needing car pooling are pre-dispatched preferentially, so that the loading and unloading efficiency in logistics is optimized; the method can effectively solve the problem that part of logistics tasks may not be accepted by people or the logistics tasks are difficult to meet effectively due to few vehicles going to logistics nodes in a logistics distribution scheme based on manual autonomous selection in the prior art.

Description

Technical Field

[0001] The present invention relates to fields related to logistics management, and in particular to a logistics node layout method and system for a cold chain of agricultural products. Background Art

[0002] Agricultural product logistics is an important link used to establish agricultural product suppliers, demanders or intermediate processors. It can meet the daily needs of consumers in a certain area for non-locally produced agricultural products and processed products, and effectively promote the flow of the industrial chain and economic vitality.

[0003] Usually, logistics nodes are linked to the origin of agricultural products, that is, there will be a logistics center near the origin of agricultural products. After the agricultural products are picked, they are sent to the logistics center, and then loaded by long-distance logistics vehicles and transported to another logistics center according to demand. The transportation routes are chaotic, resulting in uncontrolled flow of transportation vehicles, which may cause some logistics nodes to lack sufficient logistics vehicles to complete the external supply of agricultural products. In addition, for logistics tasks with smaller demand, transportation vehicles cannot be effectively loaded at one time, which greatly reduces efficiency and utilization. Summary of the invention

[0004] The purpose of the present invention is to provide a logistics node layout method and system for a cold chain of agricultural products to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A logistics node layout method for a cold chain of agricultural products, comprising:

[0007] Acquire agricultural product transaction data in the urban area, and perform statistics on the agricultural product transaction data based on a time period as a statistical basis to obtain agricultural product demand in the corresponding urban area, where the agricultural product demand is used to characterize the periodic demand for different agricultural products in the urban area;

[0008] According to the agricultural product supply of the urban area, the agricultural product demand of several other urban areas is matched to generate the supply and demand vectors related between the urban areas, and the supply and demand vectors are used to characterize the supply and demand directional relationship and the corresponding agricultural product supply and demand;

[0009] The supply and demand vector is evaluated based on the agricultural product supply and demand. If the agricultural product supply and demand is less than the basic transportation volume, the intermediate city is matched to obtain a plurality of associated sub-supply and demand vectors, the vector sum of the plurality of sub-supply and demand vectors is equal to the supply and demand vector, and the intermediate city includes a plurality of optional items;

[0010] Calculating the transportation costs of the sub-supply and demand vector schemes corresponding to the intermediate cities, and selecting the optimal sub-supply and demand vector scheme based on the unit average cost of the agricultural products;

[0011] The agricultural products loaded and unloaded in the same urban area in the sub-supply and demand plan are associated with each other, and the agricultural products are distributed and allocated to multiple logistics nodes in the urban area based on the associated marks. Multiple agricultural products with associated marks are distributed and managed in adjacent areas of the same logistics node.

[0012] As a further solution of the present invention: it also includes a node management step of high demand supply:

[0013] When the agricultural product supply and demand is greater than the basic transportation volume, supply and demand vector matching association is performed based on the agricultural product supply and demand of the urban area, so that the vector sum of the supply and demand vectors of multiple urban areas is zero, so as to obtain multiple groups of supply and demand plans. The vector sum of zero is used to represent the closed connection of the transportation route of the logistics transportation plan;

[0014] Performing transportation cost accounting for the parallel supply and demand vector chains in the supply and demand scheme, and selecting the optimal supply and demand vector chain based on the unit average cost of the corresponding agricultural products in the supply and demand vectors;

[0015] The agricultural products are associated with each other based on the supply and demand plan corresponding to the optimal supply and demand vector chain, and the agricultural products are distributed to multiple logistics nodes in the urban area based on the associated marks, so that multiple agricultural products with associated marks are at the same logistics node.

[0016] As a further solution of the present invention: the agricultural product supply and demand includes agricultural product supply and agricultural product demand, the agricultural product supply is associated with a supply cycle, and the agricultural product demand is associated with a demand cycle;

[0017] The supply cycle is based on the natural day of the natural cycle, and the agricultural product supply is used to represent the maximum supply of the agricultural product by the logistics node within a supply cycle;

[0018] The demand cycle is determined comprehensively based on the sales and preservation cycle and the transportation cycle of the agricultural product, that is, the demand cycle is the difference between the sales and preservation cycle and the transportation cycle.

[0019] As a further solution of the present invention: when the steps of matching intermediate cities to obtain multiple associated sub-supply and demand vectors and obtaining multiple groups of supply and demand solutions are executed, a verification step is also included:

[0020] A volume evaluation is performed on a group of supply and demand vectors containing associated tags of the same logistics node. The execution direction of the volume evaluation is consistent with the logistics transportation direction, and is used to characterize the difference between the demand and supply of the current logistics node;

[0021] The transport volume evaluation is numerically corrected based on the current transport surplus of the vehicle. If the corrected value is positive, surplus feedback is generated. The surplus feedback is used to characterize that the corresponding transport vehicle of the current sub-supply and demand vector can be shared with the parallel sub-supply and demand vectors of other agricultural products at the current node to complete the logistics scheduling task;

[0022] If the corrected value is negative, demand feedback is generated, and the demand feedback is used to characterize that the corresponding transport vehicle of the current sub-demand vector cannot meet the demand for supply volume on transport volume at the current node.

[0023] As a further solution of the present invention: in the step of calculating the transportation cost of the sub-supply and demand vector solutions corresponding to the intermediate cities:

[0024] Respectively obtain the transport distances of the supply and demand vector and the corresponding multiple groups of sub-supply and demand vectors, set the total amount of the transport distance corresponding to the supply and demand vector as the basic distance cost, and set the transport distances corresponding to the multiple sub-supply and demand vectors as the planned distance cost;

[0025] The sum of the costs of several schemes is calculated and subtracted from the basic route cost to obtain the additional transportation cost. The additional transportation cost is allocated based on the distance ratio of the multiple route costs of the schemes to obtain multiple corresponding sub-supply and demand costs, and the sub-supply and demand costs are used to characterize the total average transportation cost of the agricultural products corresponding to each sub-supply vector.

[0026] The embodiment of the present invention aims to provide a logistics node layout system for a cold chain of agricultural products, comprising:

[0027] A regional statistical module is used to obtain agricultural product transaction data in an urban area, and to perform statistics on the agricultural product transaction data based on a time period as a statistical basis to obtain agricultural product demand in the corresponding urban area, wherein the agricultural product demand is used to characterize the periodic demand for different agricultural products in the urban area;

[0028] A demand matching module is used to match the agricultural product demand of several other urban areas with the agricultural product supply of the urban area, and generate a supply and demand vector associated between urban areas, wherein the supply and demand vector is used to characterize the supply and demand pointing relationship and the corresponding agricultural product supply and demand;

[0029] A solution splitting module is used to evaluate the supply and demand vector based on the agricultural product supply and demand. If the agricultural product supply and demand is less than the basic transportation volume, the intermediate city is matched to obtain a plurality of associated sub-supply and demand vectors, the vector sum of the plurality of sub-supply and demand vectors is equal to the supply and demand vector, and the intermediate city includes a plurality of optional items;

[0030] A cost accounting module, used to calculate the transportation cost of the sub-supply and demand vector schemes corresponding to the intermediate cities, and select the optimal sub-supply and demand vector scheme based on the unit average cost of the agricultural products;

[0031] The node management module is used to associate and mark the agricultural products loaded and unloaded in the same urban area in the sub-supply and demand plan, and to distribute the agricultural products to multiple logistics nodes in the urban area based on the association marks. Multiple agricultural products with association marks are distributed and managed in adjacent areas of the same logistics node.

[0032] As a further solution of the present invention: it also includes a high-demand supply node management module, specifically including:

[0033] A transportation volume judgment unit is used to match and associate supply and demand vectors based on the agricultural product supply and demand of the urban area when the agricultural product supply and demand volume is greater than the basic transportation volume, so that the vector sum of the supply and demand vectors of multiple urban areas is zero, so as to obtain multiple groups of supply and demand plans, and the vector sum of zero is used to represent that the transportation route of the logistics transportation plan is closed at the beginning and the end;

[0034] An amortized accounting unit, used to perform transportation cost accounting on the parallel supply and demand vector chains in the supply and demand scheme, and select the optimal supply and demand vector chain based on the unit amortized cost of the corresponding agricultural products in the supply and demand vectors;

[0035] The distribution unit is used to associate and mark agricultural products based on the supply and demand plan corresponding to the optimal supply and demand vector chain, and to distribute agricultural products to multiple logistics nodes in the urban area based on the association marks, so that multiple agricultural products with association marks are at the same logistics node.

[0036] As a further solution of the present invention: the agricultural product supply and demand includes agricultural product supply and agricultural product demand, the agricultural product supply is associated with a supply cycle, and the agricultural product demand is associated with a demand cycle;

[0037] The supply cycle is based on the natural day of the natural cycle, and the agricultural product supply is used to represent the maximum supply of the agricultural product by the logistics node within a supply cycle;

[0038] The demand cycle is determined comprehensively based on the sales and preservation cycle and the transportation cycle of the agricultural product, that is, the demand cycle is the difference between the sales and preservation cycle and the transportation cycle.

[0039] As a further solution of the present invention: it also includes a verification module, specifically including:

[0040] A transportation volume evaluation unit is used to evaluate the transportation volume of a group of supply and demand vectors containing associated tags of the same logistics node. The execution direction of the transportation volume evaluation is consistent with the logistics transportation direction, and is used to characterize the difference between the demand and supply of the current logistics node;

[0041] A transport volume correction unit, used to perform numerical correction on the transport volume evaluation based on the current transport surplus of the vehicle, and to generate surplus feedback if the corrected value is positive, wherein the surplus feedback is used to indicate that the transport vehicle corresponding to the current sub-supply and demand vector can be shared with the parallel sub-supply and demand vectors of other agricultural products at the current node, so as to complete the logistics scheduling task;

[0042] The correction determination unit is used to generate demand feedback if the corrected value is negative, wherein the demand feedback is used to characterize that the corresponding transport vehicle of the current sub-demand vector cannot meet the demand of supply for transport volume at the current node.

[0043] As a further solution of the present invention: the cost accounting module includes:

[0044] A cost definition unit, used to respectively obtain the transport distances of the supply and demand vector and the corresponding multiple groups of sub-supply and demand vectors, set the total amount of the transport distance corresponding to the supply and demand vector as the basic distance cost, and set the transport distances corresponding to the multiple sub-supply and demand vectors as the planned distance cost;

[0045] A difference allocation unit is used to calculate the sum of the costs of several schemes and subtract it from the basic route cost to obtain additional transportation cost, and to allocate the additional transportation cost based on the distance ratio of the route costs of multiple schemes to obtain multiple corresponding sub-supply and demand costs, wherein the sub-supply and demand costs are used to characterize the total average transportation cost of agricultural products corresponding to each sub-supply vector.

[0046] Compared with the prior art, the beneficial effects of the present invention are: scheduling and managing logistics tasks based on the supply and demand of agricultural products between different cities, ensuring high utilization rate of the transportation capacity of logistics vehicles in the circulation transportation process, giving priority to pre-scheduling of agricultural products that need to be carpooled, optimizing the loading and unloading efficiency in logistics, and being able to effectively solve the situation in the prior art that some logistics tasks may not be accepted by anyone or there are too few vehicles going to the logistics nodes to effectively meet the logistics tasks, which may occur in the logistics allocation scheme based on manual autonomous selection. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 The figure is a flowchart of a logistics node layout method for agricultural product cold chain.

[0048] Figure 2 The present invention is a flowchart of the node management step in a logistics node layout method for a cold chain of agricultural products.

[0049] Figure 3 The figure is a block diagram of a logistics node layout system for agricultural product cold chain. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0051] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0052] like Figure 1 The above-mentioned method for layout of logistics nodes for cold chain of agricultural products provided by one embodiment of the present invention comprises the following steps:

[0053] S10, obtaining agricultural product transaction data of the urban area, and performing statistics on the agricultural product transaction data based on a time period as a statistical basis to obtain agricultural product demand of the corresponding urban area, wherein the agricultural product demand is used to characterize the periodic demand for different agricultural products in the urban area;

[0054] S20, matching agricultural product demands of several other urban areas with agricultural product supplies of the urban area, generating supply and demand vectors associated between urban areas, wherein the supply and demand vectors are used to characterize the supply and demand directional relationship and the corresponding agricultural product supply and demand quantities;

[0055] S30, evaluating the supply and demand vector based on the agricultural product supply and demand, if the agricultural product supply and demand is less than the basic transportation volume, matching intermediate cities to obtain multiple associated sub-supply and demand vectors, the vector sum of the multiple sub-supply and demand vectors is equal to the supply and demand vector, and the intermediate city includes multiple optional items;

[0056] S40, calculating the transportation cost of the sub-supply and demand vector schemes corresponding to the plurality of intermediate cities, and selecting the optimal sub-supply and demand vector scheme based on the unit average cost of the agricultural products;

[0057] S50, associate marks are made for the agricultural products loaded and unloaded in the same urban area in the sub-supply and demand plan, and the agricultural products are distributed and allocated to multiple logistics nodes in the urban area based on the association marks. Multiple agricultural products with association marks are distributed and managed in adjacent areas of the same logistics node.

[0058] In this embodiment, a logistics node layout method for the cold chain of agricultural products is provided. The logistics tasks are dispatched and managed based on the supply and demand of agricultural products between different cities, so as to ensure the high utilization rate of the transportation capacity of logistics vehicles in the circulation transportation process, and to give priority to the pre-dispatching of agricultural products that need to be carpooled, so as to optimize the loading and unloading efficiency in logistics. It can effectively solve the problem that some logistics tasks are not accepted by anyone or there are few vehicles going to the logistics nodes, which makes it difficult to effectively meet the logistics tasks in the logistics allocation scheme based on manual autonomous selection in the prior art. In the prior art, the agricultural products and corresponding management of the logistics nodes are randomly managed according to the region. There may be multiple logistics nodes in one place. Farmers transport agricultural products to a certain logistics node randomly or fixedly, and then the logistics vehicles go to the logistics node (or after completing the previous unloading task at the logistics node) to receive the task and load the goods to the next logistics node. This relatively loose management and scheduling method makes it easier for vehicles to complete full loads and go to the next logistics node for logistics tasks with large demand. However, this transportation method without overall planning will lead to uncontrolled flow of transportation vehicles, which may cause some logistics nodes to lack sufficient logistics vehicles to complete the external supply of agricultural products (for example, a city has two logistics nodes AB). Nodes, where the supply of agricultural products at node B is greater than the demand, which may result in fewer logistics vehicles going there), and for logistics tasks with smaller demand, the transport vehicles cannot be effectively loaded at one time, but there is no effective planning solution in the prior art, and the transport personnel are required to find the carpooling tasks on their own, involving multiple considerations such as the route destination, which is cumbersome and inefficient; Based on this, this embodiment uses the agricultural product transaction data of each city to determine the demand and supply of different agricultural products in each city, and then can match supply and demand with other cities. Usually, a city includes multiple logistics nodes, so for demand For large-volume supply and demand situations, they can be directly matched and allocated to the same logistics node according to the supply and demand balance method. This matching can be between two logistics nodes or a ring relationship between multiple logistics nodes. For small-volume supply and demand situations, it may not be possible to fully load a transport vehicle. Therefore, a supply and demand solution is set up here by summing the supply and demand vectors, that is, the departure station and the terminal station of the transport are used as the starting point of the vector to perform vector operations in the plane. For example, the supply vector of city A→B, there is also city C between cities AB, so there can be two groups of supply vectors, A→C and C→B, respectively. The utilization rate of transport vehicles can be optimized through the two groups of supply vectors.When there are multiple combinations available at the same time, the selection can be made by calculating the transportation cost. For example, through the intermediate city C and through the intermediate city D, the transportation distances at both ends are different, and the corresponding transportation items are also different (different agricultural products can accept different transportation cost price increases, and the market acceptance of price changes when they are sold needs to be considered). Therefore, through cost accounting, the logistics and transportation costs allocated to the corresponding agricultural products are determined, and the appropriate transportation combination is selected. Based on the corresponding selection, the logistics nodes and the agricultural products in the logistics nodes are dispatched, and the agricultural products that need to be carpooled are collectively dispatched in advance to facilitate loading and unloading. ;

[0059] like Figure 2 As shown, as another preferred embodiment of the present invention, it also includes a node management step of high demand supply:

[0060] S61, when the agricultural product supply and demand volume is greater than the basic transportation volume, supply and demand vector matching association is performed based on the agricultural product supply and agricultural product demand of the urban area, so that the vector sum of the supply and demand vectors of multiple urban areas is zero, so as to obtain multiple groups of supply and demand plans, and the vector sum of zero is used to represent that the transportation route of the logistics transportation plan is closed at the beginning and the end;

[0061] S62, calculating the transportation cost of the parallel supply and demand vector chains in the supply and demand scheme, and selecting the optimal supply and demand vector chain based on the unit average cost of the corresponding agricultural products in the supply and demand vectors;

[0062] S63, associating and marking the agricultural products based on the supply and demand plan corresponding to the optimal supply and demand vector chain, and distributing the agricultural products to multiple logistics nodes in the urban area based on the association marks, so that multiple agricultural products with association marks are at the same logistics node.

[0063] In this embodiment, the management steps of high supply and demand nodes are supplemented, that is, the supply and demand tasks with large demand mentioned in the previous embodiment. This type of transportation task can usually fully load a transportation vehicle or even require multiple transportation vehicles. Therefore, scheduling management is relatively convenient. It is only necessary to match the supply and demand vector task chain to ensure that when the logistics vehicles are at various transportation nodes during the transportation process, they can be assigned tasks and reloaded with goods in time after unloading. Matching management is performed based on this basic rule, and agricultural products are scheduled for the logistics nodes in each city. Similarly, this type of logistics task also requires logistics cost accounting to ensure that the logistics cost will not overflow excessively.

[0064] As another preferred embodiment of the present invention, the agricultural product supply and demand includes agricultural product supply and agricultural product demand, the agricultural product supply is associated with a supply cycle, and the agricultural product demand is associated with a demand cycle;

[0065] The supply cycle is based on the natural day of the natural cycle, and the agricultural product supply is used to represent the maximum supply of the agricultural product by the logistics node within a supply cycle;

[0066] The demand cycle is determined comprehensively based on the sales and preservation cycle and the transportation cycle of the agricultural product, that is, the demand cycle is the difference between the sales and preservation cycle and the transportation cycle.

[0067] In this embodiment, cycle-related parameters are defined here, mainly including supply cycle and demand cycle. The supply cycle corresponds to the supply end of agricultural products. Because in the mature stage of agricultural products, farmers pick and produce agricultural products every day, so the supply cycle is based on natural days; and the demand cycle is based on the demand end of agricultural products. The main consideration here is the freshness of agricultural products. If the shelf life of agricultural products is longer, more quantities can be transported at a time and sold within multiple natural days. Otherwise, it is necessary to ensure freshness through frequent updates and purchases. Similarly, the time requirement for transportation will also consume the freshness of agricultural products, so they need to be considered simultaneously.

[0068] As another preferred embodiment of the present invention, when the steps of matching intermediate cities to obtain multiple associated sub-supply and demand vectors and the step of obtaining multiple groups of supply and demand solutions are executed, a verification step is also included:

[0069] A volume evaluation is performed on a group of supply and demand vectors containing associated tags of the same logistics node. The execution direction of the volume evaluation is consistent with the logistics transportation direction, and is used to characterize the difference between the demand and supply of the current logistics node;

[0070] The transport volume evaluation is numerically corrected based on the current transport surplus of the vehicle. If the corrected value is positive, surplus feedback is generated. The surplus feedback is used to characterize that the corresponding transport vehicle of the current sub-supply and demand vector can be shared with the parallel sub-supply and demand vectors of other agricultural products at the current node to complete the logistics scheduling task;

[0071] If the corrected value is negative, demand feedback is generated, and the demand feedback is used to characterize that the corresponding transport vehicle of the current sub-demand vector cannot meet the demand for supply volume on transport volume at the current node.

[0072] In this embodiment, the verification step is further used to limit and improve the functions. The main content is the evaluation process of the transportation volume. When matching the sub-supply and demand vectors, because carpooling is involved here, it is very important whether the remaining capacity of the transport vehicle can meet the demand of the intermediate node of carpooling. There are mainly two parameters here. One is the current transportation surplus, that is, the current vehicle transportation value, and the other is the difference between the demand and supply at the logistics node, that is, the unloading and loading volume of agricultural products at the logistics node. Through comprehensive judgment, it is evaluated whether the loading task can be completed, that is, the unloading volume plus the current transportation surplus needs to be greater than or equal to the loading volume.

[0073] As another preferred embodiment of the present invention, in the step of calculating the transportation cost of the sub-supply and demand vector schemes corresponding to the intermediate cities:

[0074] Respectively obtain the transport distances of the supply and demand vector and the corresponding multiple groups of sub-supply and demand vectors, set the total amount of the transport distance corresponding to the supply and demand vector as the basic distance cost, and set the transport distances corresponding to the multiple sub-supply and demand vectors as the planned distance cost;

[0075] The sum of the costs of several schemes is calculated and subtracted from the basic route cost to obtain the additional transportation cost. The additional transportation cost is allocated based on the distance ratio of the multiple route costs of the schemes to obtain multiple corresponding sub-supply and demand costs, and the sub-supply and demand costs are used to characterize the total average transportation cost of the agricultural products corresponding to each sub-supply vector.

[0076] In this embodiment, the cost accounting step is supplemented. The basis for transport cost accounting here can be understood as follows: the basic distance cost is the minimum cost requirement for completing the basic transportation of agricultural products for basic transportation. Therefore, the cost of agricultural products for basic transportation is shared. For example, A→C→B refers to agricultural products loaded at A and unloaded at B. The detour distance exceeding this basic distance cost is the additional cost incurred for unloading (A→C) and loading (C→B) agricultural products at C. Therefore, the cost is shared based on the transportation demand.

[0077] like Figure 3 As shown, the present invention also provides a logistics node layout system for a cold chain of agricultural products, which comprises:

[0078] The regional statistical module 100 is used to obtain agricultural product transaction data in the urban area, and to perform statistics on the agricultural product transaction data based on a time period as a statistical basis to obtain agricultural product demand in the corresponding urban area, wherein the agricultural product demand is used to characterize the periodic demand for different agricultural products in the urban area;

[0079] The demand matching module 200 is used to match the agricultural product demand of several other urban areas according to the agricultural product supply of the urban area, and generate a supply and demand vector associated between urban areas, wherein the supply and demand vector is used to characterize the supply and demand directional relationship and the corresponding agricultural product supply and demand;

[0080] A solution splitting module 300 is used to evaluate the supply and demand vector based on the agricultural product supply and demand. If the agricultural product supply and demand is less than the basic transportation volume, the intermediate city is matched to obtain a plurality of associated sub-supply and demand vectors, the vector sum of the plurality of sub-supply and demand vectors is equal to the supply and demand vector, and the intermediate city includes a plurality of optional items;

[0081] The cost accounting module 400 is used to calculate the transportation cost of the sub-supply and demand vector schemes corresponding to the intermediate cities, and select the optimal sub-supply and demand vector scheme based on the unit average cost of the agricultural products;

[0082] The node management module 500 is used to associate the agricultural products loaded and unloaded in the same urban area in the sub-supply and demand plan, and to distribute the agricultural products to multiple logistics nodes in the urban area based on the association marks. Multiple agricultural products with association marks are distributed and managed in adjacent areas of the same logistics node.

[0083] As another preferred embodiment of the present invention, it also includes a high-demand supply node management module, specifically including:

[0084] A transportation volume judgment unit is used to match and associate supply and demand vectors based on the agricultural product supply and demand of the urban area when the agricultural product supply and demand volume is greater than the basic transportation volume, so that the vector sum of the supply and demand vectors of multiple urban areas is zero, so as to obtain multiple groups of supply and demand plans, and the vector sum of zero is used to represent that the transportation route of the logistics transportation plan is closed at the beginning and the end;

[0085] An amortized accounting unit, used to perform transportation cost accounting on the parallel supply and demand vector chains in the supply and demand scheme, and select the optimal supply and demand vector chain based on the unit amortized cost of the corresponding agricultural products in the supply and demand vectors;

[0086] The distribution unit is used to associate and mark agricultural products based on the supply and demand plan corresponding to the optimal supply and demand vector chain, and to distribute agricultural products to multiple logistics nodes in the urban area based on the association marks, so that multiple agricultural products with association marks are at the same logistics node.

[0087] As another preferred embodiment of the present invention, the agricultural product supply and demand includes agricultural product supply and agricultural product demand, the agricultural product supply is associated with a supply cycle, and the agricultural product demand is associated with a demand cycle;

[0088] The supply cycle is based on the natural day of the natural cycle, and the agricultural product supply is used to represent the maximum supply of the agricultural product by the logistics node within a supply cycle;

[0089] The demand cycle is determined comprehensively based on the sales and preservation cycle and the transportation cycle of the agricultural product, that is, the demand cycle is the difference between the sales and preservation cycle and the transportation cycle.

[0090] As another preferred embodiment of the present invention, it also includes a verification module, specifically including:

[0091] A transportation volume evaluation unit is used to evaluate the transportation volume of a group of supply and demand vectors containing associated tags of the same logistics node. The execution direction of the transportation volume evaluation is consistent with the logistics transportation direction, and is used to characterize the difference between the demand and supply of the current logistics node;

[0092] A transport volume correction unit, used to perform numerical correction on the transport volume evaluation based on the current transport surplus of the vehicle, and to generate surplus feedback if the corrected value is positive, wherein the surplus feedback is used to indicate that the transport vehicle corresponding to the current sub-supply and demand vector can be shared with the parallel sub-supply and demand vectors of other agricultural products at the current node, so as to complete the logistics scheduling task;

[0093] The correction determination unit is used to generate demand feedback if the corrected value is negative, wherein the demand feedback is used to characterize that the corresponding transport vehicle of the current sub-demand vector cannot meet the demand of supply for transport volume at the current node.

[0094] As another preferred embodiment of the present invention, the cost accounting module includes:

[0095] A cost definition unit, used to respectively obtain the transport distances of the supply and demand vector and the corresponding multiple groups of sub-supply and demand vectors, set the total amount of the transport distance corresponding to the supply and demand vector as the basic distance cost, and set the transport distances corresponding to the multiple sub-supply and demand vectors as the planned distance cost;

[0096] A difference allocation unit is used to calculate the sum of the costs of several schemes and subtract it from the basic route cost to obtain additional transportation cost, and to allocate the additional transportation cost based on the distance ratio of the route costs of multiple schemes to obtain multiple corresponding sub-supply and demand costs, wherein the sub-supply and demand costs are used to characterize the total average transportation cost of agricultural products corresponding to each sub-supply vector.

[0097] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0098] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the disclosure in the specification and examples. This application is intended to cover any variations, uses or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the claims.

[0099] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A logistics node layout method for a cold chain of agricultural products, characterized in that: Include: Acquire agricultural product transaction data in the urban area, and perform statistics on the agricultural product transaction data based on a time period as a statistical basis to obtain agricultural product demand in the corresponding urban area, where the agricultural product demand is used to characterize the periodic demand for different agricultural products in the urban area; According to the agricultural product supply of the urban area, the agricultural product demand of several other urban areas is matched to generate the supply and demand vectors related between urban areas, and the supply and demand vectors are used to characterize the supply and demand pointing relationship and the corresponding agricultural product supply and demand; The supply and demand vector is evaluated based on the agricultural product supply and demand. If the agricultural product supply and demand is less than the basic transportation volume, the intermediate city is matched to obtain a plurality of associated sub-supply and demand vectors, the vector sum of the plurality of sub-supply and demand vectors is equal to the supply and demand vector, and the intermediate city includes a plurality of optional items; Calculating the transportation costs of the sub-supply and demand vector schemes corresponding to the intermediate cities, and selecting the optimal sub-supply and demand vector scheme based on the unit average cost of the agricultural products; The agricultural products loaded and unloaded in the same urban area in the sub-supply and demand plan are associated with each other, and the agricultural products are distributed to multiple logistics nodes in the urban area based on the associated marks. Multiple agricultural products with associated marks are distributed and managed in adjacent areas of the same logistics node.

2. A logistics node layout method for a cold chain of agricultural products according to claim 1, characterized in that: Also included are the node management steps for high demand provisioning: When the agricultural product supply and demand is greater than the basic transportation volume, supply and demand vector matching association is performed based on the agricultural product supply and demand of the urban area, so that the vector sum of the supply and demand vectors of multiple urban areas is zero, so as to obtain multiple groups of supply and demand plans. The vector sum of zero is used to represent the closed connection of the transportation route of the logistics transportation plan; Performing transportation cost accounting for the parallel supply and demand vector chains in the supply and demand scheme, and selecting the optimal supply and demand vector chain based on the unit average cost of the corresponding agricultural products in the supply and demand vectors; The agricultural products are associated with each other based on the supply and demand plan corresponding to the optimal supply and demand vector chain, and the agricultural products are distributed to multiple logistics nodes in the urban area based on the associated marks, so that multiple agricultural products with associated marks are at the same logistics node.

3. A logistics node layout method for a cold chain of agricultural products according to claim 2, characterized in that: The agricultural product supply and demand includes agricultural product supply and agricultural product demand, the agricultural product supply is associated with a supply cycle, and the agricultural product demand is associated with a demand cycle; The supply cycle is based on the natural day of the natural cycle, and the agricultural product supply is used to represent the maximum supply of the agricultural product by the logistics node within a supply cycle; The demand cycle is determined comprehensively based on the sales and preservation cycle and the transportation cycle of the agricultural product, that is, the demand cycle is the difference between the sales and preservation cycle and the transportation cycle.

4. A logistics node layout method for a cold chain of agricultural products according to claim 3, characterized in that: When the steps of matching intermediate cities to obtain multiple associated sub-supply and demand vectors and obtaining multiple groups of supply and demand solutions are performed, a verification step is also included: A volume evaluation is performed on a group of supply and demand vectors containing associated tags of the same logistics node. The execution direction of the volume evaluation is consistent with the logistics transportation direction, and is used to characterize the difference between the demand and supply of the current logistics node; The transport volume evaluation is numerically corrected based on the current transport surplus of the vehicle. If the corrected value is positive, surplus feedback is generated. The surplus feedback is used to characterize that the corresponding transport vehicle of the current sub-supply and demand vector can be shared with the parallel sub-supply and demand vectors of other agricultural products at the current node to complete the logistics scheduling task; If the corrected value is negative, demand feedback is generated, and the demand feedback is used to characterize that the corresponding transport vehicle of the current sub-demand vector cannot meet the demand for supply volume on transport volume at the current node.

5. A logistics node layout method for a cold chain of agricultural products according to claim 1, characterized in that: In the step of calculating the transportation cost of the sub-supply and demand vector solutions corresponding to the intermediate cities: Respectively obtain the transport distances of the supply and demand vector and the corresponding multiple groups of sub-supply and demand vectors, set the total amount of the transport distance corresponding to the supply and demand vector as the basic distance cost, and set the transport distances corresponding to the multiple sub-supply and demand vectors as the planned distance cost; The sum of the costs of several schemes is calculated and subtracted from the basic route cost to obtain the additional transportation cost. The additional transportation cost is allocated based on the distance ratio of the multiple route costs of the schemes to obtain multiple corresponding sub-supply and demand costs, and the sub-supply and demand costs are used to characterize the total average transportation cost of the agricultural products corresponding to each sub-supply vector.

6. A logistics node layout system for agricultural product cold chain, characterized in that: Include: A regional statistical module is used to obtain agricultural product transaction data in an urban area, and to perform statistics on the agricultural product transaction data based on a time period as a statistical basis to obtain agricultural product demand in the corresponding urban area, wherein the agricultural product demand is used to characterize the periodic demand for different agricultural products in the urban area; A demand matching module is used to match the agricultural product demand of several other urban areas with the agricultural product supply of the urban area, and generate a supply and demand vector associated between urban areas, wherein the supply and demand vector is used to characterize the supply and demand pointing relationship and the corresponding agricultural product supply and demand; A solution splitting module is used to evaluate the supply and demand vector based on the agricultural product supply and demand. If the agricultural product supply and demand is less than the basic transportation volume, the intermediate city is matched to obtain a plurality of associated sub-supply and demand vectors, the vector sum of the plurality of sub-supply and demand vectors is equal to the supply and demand vector, and the intermediate city includes a plurality of optional items; A cost accounting module, used to calculate the transportation cost of the sub-supply and demand vector schemes corresponding to the intermediate cities, and select the optimal sub-supply and demand vector scheme based on the unit average cost of the agricultural products; The node management module is used to associate and mark the agricultural products loaded and unloaded in the same urban area in the sub-supply and demand plan, and to distribute the agricultural products to multiple logistics nodes in the urban area based on the association marks. Multiple agricultural products with association marks are distributed and managed in adjacent areas of the same logistics node.

7. A logistics node layout system for a cold chain of agricultural products according to claim 6, characterized in that: It also includes a high-demand supply node management module, including: A transportation volume judgment unit is used to match and associate supply and demand vectors based on the agricultural product supply and demand of the urban area when the agricultural product supply and demand volume is greater than the basic transportation volume, so that the vector sum of the supply and demand vectors of multiple urban areas is zero, so as to obtain multiple groups of supply and demand plans, and the vector sum of zero is used to represent that the transportation route of the logistics transportation plan is closed at the beginning and the end; An amortized accounting unit, used to perform transportation cost accounting on the parallel supply and demand vector chains in the supply and demand scheme, and select the optimal supply and demand vector chain based on the unit amortized cost of the corresponding agricultural products in the supply and demand vectors; The distribution unit is used to associate and mark agricultural products based on the supply and demand plan corresponding to the optimal supply and demand vector chain, and to distribute agricultural products to multiple logistics nodes in the urban area based on the association marks, so that multiple agricultural products with association marks are at the same logistics node.

8. A logistics node layout system for cold chain of agricultural products according to claim 7, characterized in that: The agricultural product supply and demand includes agricultural product supply and agricultural product demand, the agricultural product supply is associated with a supply cycle, and the agricultural product demand is associated with a demand cycle; The supply cycle is based on the natural day of the natural cycle, and the agricultural product supply is used to represent the maximum supply of the agricultural product by the logistics node within a supply cycle; The demand cycle is determined comprehensively based on the sales and preservation cycle and the transportation cycle of the agricultural product, that is, the demand cycle is the difference between the sales and preservation cycle and the transportation cycle.

9. A logistics node layout system for cold chain of agricultural products according to claim 8, characterized in that: It also includes verification modules, including: A transportation volume evaluation unit is used to evaluate the transportation volume of a group of supply and demand vectors containing associated tags of the same logistics node. The execution direction of the transportation volume evaluation is consistent with the logistics transportation direction, and is used to characterize the difference between the demand and supply of the current logistics node; A transport volume correction unit, used to perform numerical correction on the transport volume evaluation based on the current transport surplus of the vehicle, and to generate surplus feedback if the corrected value is positive, wherein the surplus feedback is used to indicate that the transport vehicle corresponding to the current sub-supply and demand vector can be shared with the parallel sub-supply and demand vectors of other agricultural products at the current node, so as to complete the logistics scheduling task; The correction determination unit is used to generate demand feedback if the corrected value is negative, wherein the demand feedback is used to characterize that the corresponding transport vehicle of the current sub-demand vector cannot meet the demand of supply for transport volume at the current node.

10. A logistics node layout system for agricultural product cold chain according to claim 6, characterized in that: The cost accounting module includes: A cost definition unit, used to respectively obtain the transport distances of the supply and demand vector and the corresponding multiple groups of sub-supply and demand vectors, set the total amount of the transport distance corresponding to the supply and demand vector as the basic distance cost, and set the transport distances corresponding to the multiple sub-supply and demand vectors as the planned distance cost; A difference allocation unit is used to calculate the sum of the costs of several schemes and subtract it from the basic route cost to obtain additional transportation cost, and to allocate the additional transportation cost based on the distance ratio of the route costs of multiple schemes to obtain multiple corresponding sub-supply and demand costs, wherein the sub-supply and demand costs are used to characterize the total average transportation cost of agricultural products corresponding to each sub-supply vector.

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