Port hazardous chemical vehicle traffic organization method based on safety guarantee and freight demand

Abstract

The invention, which relates to the technical field of port vehicle management, discloses a port hazardous chemical vehicle traffic organization method based on safety guarantee and freight demand, comprising the following steps: acquiring related information of hazardous chemical vehicles inside and outside a port warehouse by using an acquisition system; establishing a hazardous chemical substance port vehicle appointment queuing system, and determining a vehicle entry priority order according to hazardous chemical substance freight demands of different enterprises; establishing a port hazardous chemical substance vehicle traffic organization planning method, and reasonably arranging the route and time of each vehicle entering and exiting the yard according to the loading condition of the hazardous chemical substance vehicle on the crane position in the oil loading island allocated by each company and the related information of the hazardous chemical substance vehicle in the yard and according to the priority order of the hazardous chemical substance vehicles; a reasonable appointment entering mechanism is utilized to determine the cargo transportation order of the vehicles, so that management is clear, the entering and exiting conflicts of the vehicles at the hazardous chemical substance port can be effectively reduced, and the transportation safety of the hazardous chemical substances at the port is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of port vehicle management, and in particular to a method for organizing the traffic of hazardous chemicals vehicles in a port based on safety assurance and freight demands. Background Art

[0002] The vehicle transportation management of traditional hazardous chemical ports adopts the traditional method of first-in, first-out, and first-come, first-served approach, which lacks flexibility. As a result, during peak transportation periods, a large number of hazardous chemical vehicles enter the port at the same time and hazardous chemical vehicles are loaded in disorder on site, which not only reduces transportation efficiency but also increases safety risks.

[0003] Among the existing proposed improvements, methods for planning the entry, scheduling, and exit of hazardous chemical vehicles at ports have been proposed. For example, patent CN 115691201 A proposes a comprehensive management method for hazardous chemical vehicles at ports, from scheduled entry to exit. This method includes vehicle entry reservations, parking allocation, vehicle guidance, and vehicle scheduling. While this method is based on a comprehensive operational plan and establishes a hazardous chemical vehicle entry reservation system, it lacks established entry rules. Consequently, the reservation system can only calculate the number of hazardous chemical vehicles that will enter the port, but the freight demand and entry time of each hazardous chemical vehicle are uncertain. This leads to disorderly vehicle entry, a lack of safety guarantees for vehicle transportation, and certain safety risks.

[0004] In addition, the existing improved technologies do not plan reasonable exit times for hazardous chemical vehicles at ports, resulting in low loading efficiency for hazardous chemical vehicles. Hazardous chemical vehicles are prone to interaction when exiting the port, causing traffic congestion and accidents. What is more serious is that once an accidental collision occurs, it is very likely to cause serious accidents such as leakage and explosion of hazardous chemicals, posing a major threat to the safety of life and infrastructure of port personnel.

[0005] Based on this, the present invention aims to provide a port hazardous chemical vehicle traffic organization method based on safety assurance and freight needs, to solve the existing problems of hazardous chemical vehicles in ports transporting goods in an disorderly manner, unclear management, unreasonable reservation entry mechanism, and uncertain entry and exit times, which lead to lack of safety assurance in vehicle transportation. Summary of the Invention

[0006] In order to make up for the shortcomings of the existing technical problems, the purpose of the present invention is to provide a port hazardous chemical vehicle traffic organization method based on safety assurance and freight needs, and obtain information such as hazardous chemical vehicle information, personnel information, hazardous chemical information, relevant operating time information of hazardous chemical vehicles in the warehouse, and the distance between each traffic fortress in the yard through a data acquisition system; then establish a hazardous chemical port vehicle reservation queuing system, and determine the vehicle entry priority order according to the hazardous chemical freight needs of different enterprises; then establish a port hazardous chemical vehicle traffic organization planning method, allocate different loading islands and crane positions to each enterprise, and then according to the loading status of hazardous chemical vehicles on the crane positions in the loading islands assigned to each company and the relevant information of hazardous chemical vehicles in the yard, reasonably arrange the entry and exit routes and times of each vehicle according to the priority order of hazardous chemical vehicles, and use a reasonable reservation entry mechanism to clarify the order of vehicle transportation of goods, so that management is clear, which can effectively reduce the entry and exit conflicts of hazardous chemical port vehicles and ensure the safety of port hazardous chemical transportation.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A method for organizing the traffic of hazardous chemicals vehicles at a port based on safety assurance and freight demand includes the following steps:

[0009] (1) Establish a hazardous chemicals port traffic data collection system to collect information related to hazardous chemicals vehicles inside and outside the port warehouse;

[0010] (2) Establish a reservation and queuing system for hazardous chemicals port vehicles. For reserved vehicles, the reserved vehicles will be sorted according to the information of the vehicle's company, the hazardous chemicals it carries, and the freight demand;

[0011] (3) After determining the queue order of vehicles, determine the hazardous chemical vehicles that can enter the site immediately based on the loading status of all corporate vehicles in the warehouse and the priority order of vehicles outside the warehouse that have made appointments to enter the site, and reasonably arrange the entry time, entry route, exit route and exit time of the vehicle according to the priority order of the hazardous chemical vehicles that can enter the site immediately; arrange the entry time, entry route, exit time and exit route of these vehicles according to the exit time of all hazardous chemical vehicles in the warehouse and the priority order of hazardous chemical vehicles that cannot enter the site immediately; in the event of an interaction due to failure to prepare for exit at the designated time, this emergency situation shall be resolved by formulating a safety guarantee mechanism for the exit of hazardous chemical vehicles when an interaction occurs.

[0012] In the present invention, the traffic data collection system includes a gate recording device and a monitoring device, wherein the gate recording device is placed at the entrance and exit of the port yard in the form of a horizontal bar. The gate recording device automatically opens when a hazardous chemical vehicle enters the port yard and records the license plate number, vehicle information, information about hazardous chemicals carried by the hazardous chemical vehicle, and the time the vehicle arrives at the port entrance and exit through a camera installed next to the gate;

[0013] Monitoring equipment is installed at the entrances and exits of the warehouse, important internal intersections, high-frequency traffic accident sites, important warehouse facilities, and various crane positions. Through the monitoring equipment, the number and location information of all hazardous chemical vehicles working in the warehouse and the loading status of each hazardous chemical vehicle at the crane position can be monitored in real time.

[0014] In the present invention, the order of vehicles entering the venue is as follows:

[0015] First, the demand type, demand quantity, number of vacant crane positions of the enterprise to which the vehicle belongs, and the remaining capacity of the hazardous chemicals transported by the vehicle in the warehouse are calculated for each hazardous chemical vehicle according to the information of the enterprise and hazardous chemicals to which each hazardous chemical vehicle that has made an appointment to enter the warehouse. Then, a weighted scoring method is used to assign different weight coefficients to the demand type, demand quantity, number of vacant crane positions of the enterprise to which the vehicle belongs, and the remaining capacity of the hazardous chemicals transported by the vehicle in the warehouse. The final score of each hazardous chemical vehicle is calculated by multiplying the demand type and quantity of each hazardous chemical vehicle, the number of vacant crane positions of the enterprise to which the vehicle belongs in the warehouse, and the remaining capacity score of the hazardous chemicals transported by the vehicle in the warehouse by the corresponding weight coefficient. When the remaining capacity of the hazardous chemicals transported by a hazardous chemical vehicle that has made an appointment to enter the warehouse is 0, the vehicle cannot enter the warehouse to load hazardous chemicals, and the final score of the hazardous chemical vehicle is 0. All hazardous chemical vehicles that have made an appointment to enter the warehouse are ranked, and the higher the score, the higher the priority.

[0016] In the present invention, the judgment of whether the hazardous chemical vehicle can enter the site immediately, as well as the entry time and entry route arrangement:

[0017] 1) Determine whether the vehicle with the highest priority outside the depot can enter the depot immediately and arrange the entry route

[0018] ① When all the crane positions of the enterprise to which the hazardous chemicals vehicle with the highest priority belongs are empty, and no vehicle of the enterprise is driving in the warehouse, the vehicle will be assigned to the crane position with the shortest approach route and will be arranged to enter the warehouse immediately;

[0019] ② When there are vehicles on some of the crane slots of the enterprise to which the hazardous chemicals vehicle with the highest priority belongs, or there are vehicles of this enterprise driving in the warehouse, the vehicle will be allocated to an available crane slot that can be reserved in the warehouse and the vehicle will be arranged to enter the warehouse immediately;

[0020] ③ When all crane positions of the enterprise to which the hazardous chemicals vehicle with the highest priority belongs are occupied by vehicles, the vehicle will be allocated to the crane position of the hazardous chemicals vehicle that left the site first based on the loading status and priority order of all the vehicles on the crane positions;

[0021] 2) Follow the above steps to determine whether the second-priority hazardous chemical vehicle can enter the site immediately. Similarly, determine all vehicles outside the warehouse that can enter the site immediately and arrange the entry time and entry route of these hazardous chemical vehicles. Vehicles entering the site immediately must maintain a certain headway between the vehicles. s Therefore, after determining the entry time of the first hazardous chemical vehicle that can enter the site immediately, the entry time of each subsequent hazardous chemical vehicle that can enter the site immediately is determined based on the optimal headway.

[0022] In the present invention, the preparation time for all hazardous chemical vehicles in the hazardous chemical storage yard is arranged as follows:

[0023] After completing their freight needs, hazardous chemical vehicles from different companies must exit in an orderly manner according to the prescribed exit routes and prescribed speeds;

[0024] ① First, calculate the number of hazardous chemical trucks in the port hazardous chemical storage yard that can complete the loading of goods at the crane position within the T interval. Assume that there are X vehicles in the port storage yard that can complete the loading of goods within the time T;

[0025] ② Sort the X vehicles in order of priority according to the vehicle priority calculation rules. Let the hazardous chemical vehicle with the highest priority leave the station first, and the vehicle with the lowest priority leave the station last. The hazardous chemical vehicle with the highest priority leaves the station immediately after loading the cargo. Calculate the preparation time T2 for the hazardous chemical vehicle with the highest priority to leave the station:

[0026] T2=T1+T m

[0027] Among them, T1 is the current time; T m The remaining loading time of vehicle m, which has the highest priority for hazardous chemicals;

[0028] ③ When the hazardous chemicals vehicle m with the highest priority is closer to the warehouse exit;

[0029] (I) When the hazardous chemicals vehicle with the highest priority is close to the depot exit and is loading quickly, the hazardous chemicals vehicle with the second highest priority will exit immediately after loading and prepare for exit time T3;

[0030] T3=T1+T n

[0031] Among them, T n T is the remaining loading time of vehicle n, which is the second-highest priority hazardous chemicals vehicle. m <T n ;

[0032] (II) When the hazardous chemicals vehicle with the highest priority is close to the warehouse exit but is loading slowly, in order to prevent the two vehicles from interacting during driving, calculate the time T4 when the hazardous chemicals vehicle with the highest priority arrives at the conflict point;

[0033]

[0034] Calculate the time T5 when the hazardous chemicals vehicle with the second highest priority arrives at the conflict point;

[0035]

[0036] If T4 < T5, the hazardous chemicals vehicle with the second highest priority will depart immediately upon completion of loading, and the hazardous chemicals vehicle with the second highest priority will exit immediately upon completion of loading, and the exit time will be T3;

[0037] T3=T1+T n

[0038] If T4>T5, in order to prevent the two vehicles from interacting during driving, the hazardous chemicals vehicle with the second priority order needs to wait at the crane position after loading. The waiting time is the time difference between the two vehicles driving to the collision point after loading. The second priority hazardous chemicals vehicle is ready to leave at T3.

[0039] T3=T1+T4-T5

[0040] ④ When the hazardous chemicals vehicle m with the highest priority is far away from the warehouse exit;

[0041] (I) When the hazardous chemical vehicle with the highest priority is far from the warehouse exit but loads quickly, calculate the time T4 when the hazardous chemical vehicle with the highest priority arrives at the conflict point, and the time T5 when the hazardous chemical vehicle with the second highest priority arrives at the conflict point;

[0042] If T4 is less than T5, the hazardous chemicals vehicle with the second highest priority will depart immediately after loading, and the second-highest priority hazardous chemicals vehicle will be ready to depart at T3;

[0043] T3=T1+T n

[0044] If T4>T5, in order to prevent the two vehicles from interacting during driving, the hazardous chemicals vehicle with the second priority order needs to wait at the crane position after loading. The waiting time is the time difference between the two vehicles driving to the collision point after loading. The second priority hazardous chemicals vehicle is ready to leave at T3.

[0045] T3=T1+T4-T5

[0046] (II) When the hazardous chemicals vehicle with the highest priority is far from the warehouse exit but loading is slow, T m >T n In order to prevent the two vehicles from interacting during driving, the hazardous chemicals vehicle with the second priority order needs to wait at the crane position after loading. The waiting time is the time difference between the two vehicles driving to the collision point after loading. The second priority hazardous chemicals vehicle is ready to leave at T3.

[0047] T3=T1+T4-T5

[0048] ⑤ Calculate the preparation time T of all vehicles in the first interval T according to the above steps. i After the vehicle with the lowest priority in the first interval T exits, the preparation time for exiting of all vehicles in the second interval T is calculated in sequence according to the above steps. Similarly, the preparation time for exiting of all vehicles in the hazardous chemicals warehouse T can be calculated. i .

[0049] In the present invention, the entry time of hazardous chemical vehicles that cannot enter the warehouse immediately is arranged as follows:

[0050] Calculate the entry time of the hazardous chemical vehicle with the highest priority;

[0051] ① Calculate the time t1 for the hazardous chemical vehicle with the highest priority to travel from the warehouse entrance to the designated crane position;

[0052]

[0053] ②Calculate the entry time t2 of the hazardous chemical vehicle with the highest priority;

[0054] t2=T k -t1

[0055] Among them, T k When the hazardous chemicals vehicle with the highest priority in the reservation queue is assigned to a designated crane position, the vehicle at that crane position is ready to leave the crane position;

[0056] After determining the entry time of the highest priority hazardous chemical vehicle that cannot enter the site immediately, on this basis, arrange the entry time of each hazardous chemical vehicle that cannot enter the site immediately. j and preparation time T i .

[0057] In the present invention, for the interaction situation that occurs when the user is not ready to leave the venue at the designated time, the emergency safety guarantee mechanism:

[0058] If the number of hazardous chemical vehicles interacting in two directions is the same, the order of exit will be arranged according to the priority of the hazardous chemical vehicles interacting in the two directions. The hazardous chemical vehicles with higher priority will be arranged to exit first, and the vehicles with lower priority will be allowed to wait in place. If the priority of two vehicles is the same, one vehicle will be randomly arranged to exit first, and the other vehicle will wait in place.

[0059] If the number of hazardous chemical vehicles interacting in the two directions is different, the order of exit shall be arranged according to the degree of concentration of the hazardous chemical vehicles interacting in the two directions. According to the principle of a small number of vehicles giving way to a large number of vehicles, the vehicle groups with a high degree of concentration shall be given priority for exit.

[0060] Compared with the prior art, the present invention has the following beneficial effects:

[0061] The present invention establishes a hazardous chemical port traffic data collection system and a hazardous chemical port vehicle reservation queuing system. According to the types and quantities of hazardous chemicals demanded by vehicles of different enterprises, the number of vacant crane slots of the enterprise to which the vehicle belongs in the depot, and the remaining capacity of the hazardous chemicals transported by the vehicle in the depot, an interpolation scoring and weighted scoring algorithm is adopted to determine the priority order of hazardous chemical vehicles, thereby obtaining the order in which hazardous chemical vehicles enter the depot, solving the existing disorderly transportation of goods by hazardous chemical vehicles in the port, and providing a basis for vehicle traffic organization planning.

[0062] The present invention is based on determining the priority order of hazardous chemical vehicles, and arranges the entry route, entry time, exit route and exit time of hazardous chemical vehicles in sequence according to the operation status of hazardous chemical vehicles in the port warehouse and the crane position status. It can further improve the loading efficiency of hazardous chemical vehicles in the port, clarify the transportation order of hazardous chemical vehicles, make unclear management, effectively avoid traffic congestion and traffic accidents in the port hazardous chemical warehouse, and reduce the safety risks of port vehicle transportation.

[0063] Solve the existing problems of hazardous chemicals vehicles transporting goods in disorder at ports, unclear management, unreasonable reservation entry mechanism, and uncertain entry and exit times, which lead to lack of safety guarantees for vehicle transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 Flow chart of the method of the present invention.

[0065] Figure 2 This is a route planning map for hazardous chemical vehicles within the port storage yard of the present invention.

[0066] Figure 3 This is a detailed diagram of the crane position and loading island in the port of the present invention.

[0067] Figure 4 This is a schematic diagram of the port exit route situation 1 of the present invention.

[0068] Figure 5 This is a schematic diagram of the port exit route situation 2 of the present invention.

[0069] Figure 6 This is a schematic diagram of situation 1 where conflict points are expected to occur on the port exit route of the present invention.

[0070] Figure 7 This is a schematic diagram of situation 2 where conflict points are expected to occur on the port exit route of the present invention.

[0071] Figure 8 Schematic diagram of the case of the present invention. DETAILED DESCRIPTION

[0072] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0073] like Figure 1-8 As shown, the present invention discloses a method for organizing the traffic of hazardous chemicals vehicles in ports based on safety assurance and freight demand, which is as follows:

[0074] 1. Establish a hazardous chemicals port traffic data collection system to collect relevant information on hazardous chemicals vehicles inside and outside the port warehouse.

[0075] Traffic data collection system includes gate recording equipment and monitoring equipment, such as Figure 2 As shown, the barrier recording device is installed as a horizontal bar at the entrance and exit of the port storage yard. The barrier recording device will automatically open when a hazardous chemical vehicle enters the port storage yard and record the license plate number, vehicle information, hazardous chemical information carried by the hazardous chemical vehicle, and the time t0 when the vehicle arrives at the port entrance and exit through a camera installed next to the barrier. The background system can then collect the length S of the road section from the entrance to each crane position by accessing the navigation system. i , the distance between each crane position and the warehouse exit L i , the distance l between each crane position and the conflict point of hazardous chemicals vehicles in the warehouse iThe location and initial speed of hazardous chemical vehicles are monitored, and guide signs are installed at entrances, requiring hazardous chemical vehicles to travel at a speed of v within the depot. Monitoring equipment is installed at depot entrances and exits, key intersections, high-accident areas, key depot facilities, and each crane station. This monitoring equipment provides real-time information on the number and location of all hazardous chemical vehicles operating within the depot, as well as the loading status of each crane station. For example, the remaining loading time (T0) for a hazardous chemical vehicle at a crane station and the current time (T1) are all available. This information is transmitted to the hazardous chemical port traffic data collection system, laying the foundation for subsequent hazardous chemical vehicle entry reservations and traffic organization planning. Furthermore, monitoring equipment can record whether each hazardous chemical vehicle follows the prescribed route within the depot. Drivers' driving behavior will be rewarded or penalized. Drivers who do not follow the prescribed route or speed will be fined or warned. Vehicles and drivers that strictly adhere to transportation regulations and have a good safety record can receive material rewards, such as bonuses and fuel subsidies.

[0076] 2. Establish a reservation and queuing system for hazardous chemicals port vehicles, and determine the priority order for vehicles to enter the port based on the hazardous chemicals freight needs of different companies.

[0077] The port vehicle reservation and queuing system consists of a data server, a gateway, and the reservation and queuing system software. This system utilizes a mobile app to facilitate fuel pick-up reservations, self-service ticket exchange, access control, and self-service fuel delivery. The data server, serving as the system's data storage and processing center, carries a vast amount of critical information, enabling accurate collection, timely updates, and rapid processing. The gateway plays a key role in system security isolation and protection, ensuring the security and integrity of data within the system. The reservation and queuing system software boasts powerful logical processing capabilities, enabling it to quickly and accurately receive and process reservation requests from the mobile app at any time.

[0078] When a reservation request is received, the system prioritizes vehicles for entry based on the company they belong to, the hazardous chemicals they are transporting, and freight demand. Priority is given to vehicles whose companies have a large number of available crane slots within the port's warehouse and sufficient hazardous chemical storage capacity. This priority arrangement maximizes safety and efficiency, ensuring that hazardous chemicals in urgent need of processing are shipped promptly, reducing potential safety risks and improving the operational efficiency of the entire warehouse.

[0079] (1) In order to determine the priority order by comprehensively considering the above factors, first calculate the demand type and quantity of each hazardous chemical vehicle, the number of available crane positions of the enterprise to which the vehicle belongs in the warehouse, and the remaining capacity of the hazardous chemicals transported by the vehicle in the warehouse based on the information of the enterprise and hazardous chemicals corresponding to each hazardous chemical vehicle that has made an appointment to enter the warehouse. As shown in Table 1 and Table 2, the oil products arranged on the finished oil loading island are E92, E95 and E98, and the chemical products arranged on the chemical loading island are sulfuric acid, calcium chloride, sodium hydroxide and potassium hydroxide. When the number of types of hazardous chemicals required by the enterprise is k (the k value is the maximum value of the types of hazardous chemicals required by each enterprise) (100 points), when the number of types of hazardous chemicals required by the enterprise is 0 (0 points), when the number of types of hazardous chemicals required by the enterprise is greater than 0 and less than k, the interpolation method is used for scoring; when the number of types of hazardous chemicals required by the enterprise is w (the w value is the maximum value of the capacity of hazardous chemical vehicles of each enterprise) (100 points), when the number of types of hazardous chemicals required by the enterprise is 0 (0 points), when the number of types of hazardous chemicals required by the enterprise is greater than 0 and less than k, the interpolation method is used for scoring; when the number of types of hazardous chemicals required by the enterprise is w (the w value is the maximum value of the capacity of hazardous chemical vehicles of each enterprise) (100 points), when the number of types of hazardous chemicals required by the enterprise is 0 (0 points), when the number of types of hazardous chemicals required by the enterprise is greater than 0 When it is less than w, the interpolation method is used for scoring; when the number of crane positions remaining in the warehouse for the enterprise is j (the value of j is the maximum number of crane positions corresponding to each enterprise) (100 points), when the number of crane positions remaining in the warehouse for the enterprise is 0 (0 points), and when the number of crane positions remaining in the warehouse for the enterprise is greater than 0 and less than j, the interpolation method is used for scoring; when the remaining capacity of hazardous chemicals transported by the vehicle in the warehouse is i (the value of i is the maximum capacity of the hazardous chemicals storage tank) (100 points), when the remaining capacity of hazardous chemicals transported by the vehicle in the warehouse is 0 (0 points), and when the remaining capacity of hazardous chemicals transported by the vehicle in the warehouse is greater than 0 and less than i, the interpolation method is used for scoring; when the above values ​​of the vehicle can be adjusted according to actual conditions.

[0080] Table 1 Detailed list of finished oil loading island

[0081]

[0082] Table 2 Chemical loading island details

[0083]

[0084] (2) According to the enterprise and hazardous chemicals information corresponding to each hazardous chemicals vehicle that has made an appointment to enter the site, the demand type, demand quantity, number of vacant crane positions of the enterprise to which the vehicle belongs in the storage yard, and the remaining capacity of hazardous chemicals transported by the vehicle in the storage yard are calculated for each hazardous chemicals vehicle. Then, a weighted scoring method is used to assign different weight coefficients to the demand type, demand quantity, number of vacant crane positions of the enterprise to which the vehicle belongs in the storage yard, and the remaining capacity of hazardous chemicals transported by the vehicle in the storage yard. For example, the weight coefficient of the demand quantity is 0.2, the weight coefficient of the demand type is 0.2, the weight coefficient of the number of vacant crane positions of the enterprise to which the vehicle belongs in the storage yard is 0.3, and the weight coefficient of the remaining capacity of hazardous chemicals required by the vehicle in the storage yard is 0.3. The final score of each hazardous chemical vehicle is then calculated by multiplying the demand type and quantity of each hazardous chemical vehicle, the number of available crane positions within the warehouse for the company to which the vehicle belongs, and the remaining capacity score of the hazardous chemicals transported by the vehicle within the warehouse by the corresponding weight coefficient. When the remaining capacity of the hazardous chemicals transported by a hazardous chemical vehicle scheduled to enter the warehouse is 0, the vehicle cannot enter the warehouse to load hazardous chemicals, and the final score of the hazardous chemical vehicle is 0. All hazardous chemical vehicles scheduled to enter the warehouse are sorted, and the higher the score, the higher the priority order. When several vehicles from the same company transporting the same type of hazardous chemicals have the same score, the priority order of these vehicles is randomly arranged. When encountering some unexpected situations, it is necessary to establish an emergency plan so that the order of entry can be flexibly adjusted under special circumstances.

[0085] 3. Establish a traffic organization and planning method for hazardous chemical vehicles at ports, determine the entry and exit routes and times for hazardous chemical vehicles based on priority, and provide safety guarantees for vehicle transportation at ports.

[0086] After determining the queuing order of vehicles, the entry route, entry time, exit route and exit time of hazardous chemicals vehicles are arranged in sequence according to the operation status of hazardous chemicals vehicles in the port warehouse and the crane position situation, so as to reduce the entry and exit conflicts of hazardous chemicals port vehicles and ensure the safety of hazardous chemicals transportation at the port.

[0087] like Figure 3As shown, the entire storage yard is divided into finished oil loading islands and chemical loading islands. The finished oil loading islands are divided into 1# to 10# loading islands from east to west. There are crane positions on both sides of the loading islands, which are the locations where hazardous chemical vehicles stop when loading goods. Among them, 1# loading island is for double-sided loading, and the rest are for single-sided loading; the chemical loading islands are divided into 1# to 8# loading islands from east to west, all of which are for double-sided loading; since the port provides hazardous chemicals for four companies A, B, C, and D, it is necessary to allocate different loading islands, crane positions, and hazardous chemicals to companies A, B, C, and D. First, 1#, 2#, and 3# finished oil loading islands were allocated to Company A. Each loading island can load oil products a and b, of which a and b can be E92 and E95. 4# to 7# finished oil loading islands were allocated to Company B. 4# to 6# loading islands can load oil products a and c, and 7# loading island can load oil products a, b, and c, of which a, b, and c can be E92, E95, and E98. 8# and 9# finished oil loading islands were allocated to Company C. Each loading island can load oil products a, b, and c, where a, b, and c can be E92, E95, and E98. Company D is assigned loading islands 1# to 6# for chemical products. Loading islands 1# and 2# can load chemical products d, e, f, and g; loading islands 3# and 4# can load chemical products d, e, and f; and loading islands 5# and 6# can load chemical products f and g, where d, e, f, and g can be sulfuric acid, calcium chloride, sodium hydroxide, and potassium hydroxide. Furthermore, when a company urgently needs hazardous chemicals but there are no available loading bays on its designated loading island, reserved islands are required for emergency hazardous chemical vehicles. Therefore, to address these emergencies, reserved islands are set up on both the finished oil loading island and the chemical loading island. Loading island 10# is designated as a reserved island for finished oil, and loading islands 7# and 8# are designated as reserved islands for chemical products. After being allowed to enter the warehouse, hazardous chemical vehicles enter the designated crane position on the loading island according to the route planning and complete the corresponding operation plan.

[0088] (1) Figure 2 As shown in the figure, since different companies have their own fixed loading islands, when planning the entry routes for hazardous chemicals vehicles at the port, they are assigned to corresponding loading bays according to the companies to which they belong, and the length of the road section from the warehouse entrance to the loading bay is obtained as S. i First, based on the loading status of all corporate vehicles in the warehouse and the priority order of vehicles outside the warehouse that have made appointments to enter, determine which hazardous chemical vehicles outside the warehouse can enter immediately, determine whether the vehicle with the highest priority outside the warehouse can enter immediately and arrange the entry route.

[0089] ① When all the crane positions of the enterprise to which the hazardous chemicals vehicle with the highest priority belongs are empty, and no vehicle of the enterprise is driving in the warehouse, the vehicle will be assigned to the crane position with the shortest approach route and will be arranged to enter the warehouse immediately;

[0090] ② When there are vehicles on some of the crane positions belonging to the enterprise with the highest priority hazardous chemical vehicles, or there are vehicles of this enterprise moving in the storage yard, allocate the vehicle to the available crane positions that can still be reserved in the yard, and immediately arrange for the vehicle to enter the yard;

[0091] ③ When all the crane positions belonging to the enterprise with the highest priority hazardous chemical vehicles have vehicles, according to the loading conditions of the vehicles on all the crane positions and the sorting of the priority order, allocate the vehicle to the crane position belonging to the hazardous chemical vehicle that will leave the yard first.

[0092] After determining whether the vehicle with the highest priority order can enter the yard immediately, then determine whether the hazardous chemical vehicle with the second highest priority order can enter the yard immediately, and so on, to determine how many vehicles among all the vehicles reserved to enter the yard outside the storage yard can enter the yard immediately, and arrange the entry time and entry route of these hazardous chemical vehicles. In order to effectively reduce the entry conflicts of hazardous chemical port vehicles and ensure the safety of port hazardous chemical transportation, it is required that the vehicles entering the yard immediately maintain a certain headway distance l when entering the yard s Therefore, after determining the entry time of the first hazardous chemical vehicle that can enter the yard immediately, determine the entry time of each subsequent hazardous chemical vehicle that can enter the yard immediately according to the optimal headway distance. Then, according to the loading conditions of all the vehicles in the storage yard, the ready-to-leave time, and the priority order of the hazardous chemical vehicles that cannot enter the yard immediately outside the storage yard, arrange the entry time and route of the hazardous chemical vehicles that cannot enter the yard immediately in turn.

[0093] (2) Calculate the ready-to-leave time of all hazardous chemical vehicles in the hazardous chemical storage yard. As Figure 2 shown, after the hazardous chemical vehicles of different enterprises complete their freight requirements, they need to leave the yard in an orderly manner according to the specified exit route and the specified speed v. Since all the vehicles in the storage yard leave the yard in the same route direction when they finish loading the goods, vehicle interaction may occur when the hazardous chemical vehicles leave the yard. Therefore, it is necessary to formulate rules for the exit of hazardous chemical vehicles to guide the hazardous chemical vehicles to leave the yard in an orderly manner according to the rules. The vehicles in the port hazardous chemical storage yard can be divided into different batches according to the same time interval, calculate the number of vehicles that can leave the yard in each interval respectively, and then arrange the ready-to-leave time of each hazardous chemical vehicle in turn.

[0094] ① First, calculate within the T interval (0 < T < T′, the value of T can be adjusted according to the actual situation), and measure how many hazardous chemical vehicles in the port hazardous chemical storage yard can finish loading goods on the crane positions, so as to reasonably arrange the ready-to-leave time of the vehicles in the port hazardous chemical storage yard and avoid vehicle interaction. Assume that there are X vehicles in the port storage yard that can finish loading goods within the time T.

[0095] ② Sort the X vehicles in order of priority according to the vehicle priority calculation rules in the first step, so that the hazardous chemical vehicle with the highest priority among the X vehicles leaves first, and the vehicle with the lowest priority leaves last. Calculate the preparation time for each hazardous chemical vehicle to leave. The hazardous chemical vehicle with the highest priority can leave immediately after loading the goods. Then, calculate the preparation time for the hazardous chemical vehicle with the second priority based on the position relationship between the hazardous chemical vehicle with the highest priority and the hazardous chemical vehicle with the second priority and the speed of loading. The remaining loading time T of the hazardous chemical vehicle with the highest priority is obtained. m , the remaining loading time T of the hazardous chemicals vehicle n ranked second in priority n Record the current time as T1, and calculate the distance between the hazardous chemicals vehicle with the highest priority and the collision point between the two vehicles as l m The distance between the second-priority hazardous chemicals vehicle and the collision point of the two vehicles is l n , calculate the preparation time T2 for the hazardous chemical vehicle with the highest priority.

[0096] T2=T1+T m

[0097] ③ Such as Figure 4 As shown in the figure, when the hazardous chemical vehicle m with the highest priority is closer to the warehouse exit.

[0098] Ⅰ When the hazardous chemicals vehicle with the highest priority is close to the warehouse exit and loading is fast, that is, T m <T n , the hazardous chemicals vehicle with the second priority will leave the scene immediately after loading the goods, and will not interact with the hazardous chemicals vehicle with the highest priority during driving. Therefore, the hazardous chemicals vehicle with the second priority can leave the scene immediately after loading the goods. Calculate the preparation time T3 for the hazardous chemicals vehicle with the second priority to leave the scene immediately after loading the goods.

[0099] T3=T1+T n

[0100] Ⅱ When the hazardous chemicals vehicle with the highest priority is close to the warehouse exit but loading is slow, T m >T n , so that the two vehicles do not interact during the driving process. Calculate the time it takes for each vehicle to reach the collision point after loading the goods.

[0101] Calculate the time T4 when the hazardous chemical vehicle with the highest priority arrives at the conflict point.

[0102]

[0103] Calculate the time T5 when the hazardous chemicals vehicle with the second highest priority arrives at the conflict point.

[0104]

[0105] If T4 is less than T5, when the hazardous chemical vehicle with the highest priority arrives at the conflict point, the vehicle with the second priority has not yet reached the conflict point after loading the goods. In this case, the hazardous chemical vehicle with the second priority can depart immediately after loading the goods. The time T3 for the hazardous chemical vehicle with the second priority to be ready to depart immediately after loading the goods is calculated.

[0106] T3=T1+T n

[0107] If T4 > T5, by the time the highest-priority hazardous chemicals vehicle reaches the conflict point, the second-priority hazardous chemicals vehicle will have already reached the conflict point after loading. To prevent the two vehicles from intersecting while driving, the second-priority hazardous chemicals vehicle must wait at the crane station after loading. The waiting time is the difference between the two vehicles' arrival times after loading and reaching the conflict point. Calculate the second-priority hazardous chemicals vehicle's ready-to-exit time, T3.

[0108] T3=T1+T4-T5

[0109] ④ Such as Figure 5 As shown in Figure 2, when the hazardous chemicals vehicle m with the highest priority is far away from the warehouse exit.

[0110] Ⅰ When the hazardous chemicals vehicle with the highest priority is far from the warehouse exit but loads quickly, T m <T n Calculate the time it takes for the two vehicles to reach the conflict point after loading. Calculate the time T4 when the hazardous chemicals vehicle with the highest priority arrives at the conflict point.

[0111]

[0112] Calculate the time T5 when the hazardous chemicals vehicle with the second highest priority arrives at the conflict point.

[0113]

[0114] If T4 is less than T5, then when the highest-priority hazardous chemicals vehicle arrives at the conflict point, the second-priority hazardous chemicals vehicle, having finished loading, has not yet reached the conflict point. In this case, the second-priority hazardous chemicals vehicle can depart immediately upon completion of loading. Calculate the time T3 for the second-priority hazardous chemicals vehicle to be ready to depart immediately upon completion of loading.

[0115] T3=T1+T n

[0116] If T4 > T5, by the time the highest-priority hazardous chemicals vehicle reaches the conflict point, the second-priority hazardous chemicals vehicle will have already reached the conflict point after loading. To prevent the two vehicles from intersecting while driving, the second-priority hazardous chemicals vehicle must wait at the crane station after loading. The waiting time is the difference between the two vehicles' arrival times after loading and reaching the conflict point. Calculate the second-priority hazardous chemicals vehicle's ready-to-exit time, T3.

[0117] T3=T1+T4-T5

[0118] Ⅱ When the hazardous chemicals vehicle with the highest priority is far from the warehouse exit but loading is slow, T m >T n To prevent the two vehicles from interacting during their journey, the second-priority hazardous chemicals vehicle must wait at the crane station after loading. The waiting time is the difference between the two vehicles' travel time from loading to the collision point. Calculate the second-priority hazardous chemicals vehicle's preparation time, T3.

[0119] T3=T1+T4-T5

[0120] (3) After calculating the second priority hazardous chemicals vehicle preparation time in the first T interval according to the above steps, calculate the third priority hazardous chemicals vehicle preparation time in the first T interval based on this, and so on, calculate the preparation time T of all vehicles in the first interval T. i .

[0121] After the vehicle with the lowest priority in the first interval T exits, the preparation time for exiting of all vehicles in the second interval T is calculated in the same way as above. Similarly, the preparation time for exiting of all vehicles in the hazardous chemicals warehouse T can be calculated. i .

[0122] (4) After determining the preparation time T for all vehicles in the hazardous chemicals warehouse i After that, the preparation time T of all vehicles in the hazardous chemicals warehouse can be used to calculate the time of departure. i The entry time of hazardous chemicals vehicles that have made appointments to enter the site will be arranged in order of priority.

[0123] Calculate the entry time of the hazardous chemical vehicle with the highest priority in the scheduled entry.

[0124] ① Calculate the time t1 for the hazardous chemical vehicle with the highest priority to travel from the warehouse entrance to the designated crane position.

[0125]

[0126] ② Calculate the entry time t2 of the hazardous chemical vehicle with the highest priority.

[0127] t2=T k -t1

[0128] Among them, T k When the hazardous chemical vehicle with the highest priority in the reservation queue is assigned to a designated crane position, the vehicle at that crane position is ready to leave.

[0129] (5) After determining the entry time of the highest priority hazardous chemical vehicle that cannot enter the site immediately, on this basis, arrange the entry time t of each hazardous chemical vehicle that cannot enter the site immediately. j and preparation time T i .

[0130] (6) Emergency safety guarantee mechanism

[0131] When hazardous chemical vehicles in the warehouse are not ready to leave at the designated time and an interaction occurs, this emergency can be resolved by formulating a hazardous chemical vehicle exit safety guarantee mechanism when an interaction occurs, effectively reducing the exit conflicts of hazardous chemical port vehicles and ensuring the safety of hazardous chemical transportation at the port.

[0132] If the number of hazardous chemical vehicles interacting in two directions is the same, the order of exit shall be arranged according to the priority of the hazardous chemical vehicles interacting in the two directions, and the hazardous chemical vehicles with higher priority shall be arranged to exit first, and the vehicles with lower priority shall be allowed to wait in place; if the number of hazardous chemical vehicles interacting in the two directions is different, the order of exit shall be arranged according to the degree of concentration of hazardous chemical vehicles interacting in the two directions, and according to the principle of a small number of vehicles avoiding multiple vehicles, the vehicle groups with higher concentration shall be given priority to exit, so as to minimize the impact on traffic, improve the efficiency of vehicle exit, reduce the risk of accidents, and enhance the satisfaction of enterprises.

[0133] ① Such as Figure 6 As shown in the figure, the hazardous chemical vehicle M that has completed loading at the 6# loading island crane position will interact with the hazardous chemical vehicle N that is currently exiting the site when it leaves the crane position according to the prescribed exit route. Since the number of hazardous chemical vehicles interacting in the two directions is the same, the exit order needs to be determined based on the priority order of vehicle M and vehicle N when they enter the site.

[0134] Ⅰ If the priority of car M is greater than that of car N, then car M will be arranged to leave first and car N will wait in its original place;

[0135] Ⅱ If the priority of car M is lower than that of car N, then car N will be arranged to leave first and car M will wait in its original place;

[0136] ⅢIf the priority order of car M is equal to the priority order of car N, one car will be randomly arranged to leave the scene first, and the other car will wait in place.

[0137] ② If Figure 7 As shown in the figure, the hazardous chemical vehicle R that has completed loading at the crane position of the 4# loading island will interact with the hazardous chemical vehicles O, P, and Q that are exiting at this time when it leaves the crane position according to the prescribed exit route. Since the number of hazardous chemical vehicles interacting in the two directions is different, the exit order needs to be arranged according to the degree of concentration of hazardous chemical vehicles interacting in the two directions.

[0138] Because the concentration of hazardous chemical vehicles O, P, and Q on the way out is greater than that of vehicle R, vehicles O, P, and Q are arranged to leave first, and vehicle R waits in place.

[0139] Case:

[0140] As shown in Tables 4 and 5, assuming that within the finished oil loading island, the distances between loading islands 1# to 10# and the yard entrance are 600m, 700m, 800m, 900m, 1000m, 1100m, 1200m, 1300m, 1400m, and 1500m respectively; and the distances to the yard exit are 2100m, 2000m, 1900m, 1800m, 1700m, 1600m, 1500m, 1400m, 1300m, and 1200m respectively. Within the chemical loading island, the distances between 1# to 8# loading islands and the yard entrance are 400m, 500m, 600m, 700m, 800m, 900m, 1000m, and 1100m respectively; and the distances between them and the yard exit are 300m, 400m, 500m, 600m, 700m, 800m, 900m, and 1000m respectively.

[0141] Table 3 Finished Oil Loading Island Details - Case

[0142]

[0143] Table 4 Chemical loading island details - case

[0144]

[0145] like Figure 8As shown in the figure, assuming the current time is 10:00:00, the speed of hazardous chemical vehicles in the warehouse is 5m / s, and the loading time for all hazardous chemical vehicles is 8 minutes. There are five vehicles in a hazardous chemical port warehouse: B1, C1, C2, D1, and D2. Vehicle B1 is at the crane position of Company B's 5# loading island, with a remaining loading time of 5 minutes. Vehicles C1 and C2 are at the crane positions of Company C's 8# and 9# loading islands, respectively, with remaining loading times of 6 minutes and 8 minutes, respectively. Vehicles D1 and D2 are at the crane positions of Company D's 3# and 5# loading islands, respectively, with remaining loading times of 4 minutes and 7 minutes, respectively. It is known that the priority order of vehicles B1, C1, C2, D1, and D2 in the warehouse is B1, D2, C1, C2, D1. Vehicles are required to maintain a certain headway l when entering the warehouse. s is 30m.

[0146] Assume that there are three vehicles waiting in line outside the hazardous chemicals warehouse. They are A1 vehicles of Company A, and their hazardous chemical demand is E92 fuel. The hazardous chemical demand is 1500m 3 (The maximum amount of E92 oil required by Company A is 3000m3 3 ), the number of crane positions remaining in the warehouse of the enterprise is 4, and the remaining capacity of the hazardous chemicals transported by vehicle A1 in the warehouse is 10,000m 3 (The maximum remaining capacity of E92 oil transported by vehicle A1 in the depot is 50,000m3 3 ); B company's B2 vehicle, its hazardous chemical demand is E95 fuel, and the hazardous chemical demand is 1000m 3 (The maximum amount of E95 oil required by Company B is 4000m3 3 ), the number of crane positions remaining in the warehouse of the enterprise is 3, and the remaining capacity of the B1 vehicle for transporting hazardous chemicals in the warehouse is 10,000m 3 (The maximum remaining capacity of E95 oil transported by B1 vehicle in the depot is 40000m 3 ); Company C's C3 vehicle requires E95 fuel for hazardous chemicals, and its hazardous chemical demand is 4000m 3 (The maximum amount of E95 oil required by Company C is 5000m3 3 ), the number of crane positions remaining in the warehouse for this enterprise is 0, and the remaining capacity of C3 vehicles transporting hazardous chemicals in the warehouse is 40,000m 3 (The maximum remaining capacity of E95 oil transported by C3 vehicles in the depot is 50,000m3 3 ).

[0147] (1) Calculate the types and quantities of demand for A1, B2, and C3 vehicles outside the depot, the number of vacant crane positions within the depot for the enterprise to which the vehicle belongs, and the remaining capacity of the hazardous chemicals transported by the vehicle within the depot.

[0148] First, calculate the demand type and quantity of A1 vehicles, the number of available crane positions in the warehouse for the company to which the vehicle belongs, and the score of the remaining capacity of the hazardous chemicals transported by the vehicle in the warehouse.

[0149] ① Demand category score for A1 vehicle: As shown in Table 4, the maximum number of hazardous chemical categories demanded by Company A is 2. However, Company A has only one vehicle outside the depot, and its hazardous chemical demand is E92 fuel. Using the interpolation method, we can calculate that the demand category score for A1 vehicle is 50 points.

[0150] ②A1 vehicle demand quantity score: Since the demand quantity of hazardous chemicals for company A is 3000m 3 (100 points), when the enterprise's hazardous chemicals demand is 0 (0 points), when the enterprise's hazardous chemicals demand is greater than 0 and less than 3000m 3 The interpolation method is used to score. The demand for A1 car is calculated using the interpolation method and the score is 50 points;

[0151] ③ Score for the number of vacant crane positions of the company to which vehicle A1 belongs in the depot: Since the total number of crane positions of company A in the depot is 4, the score is 100 points when the number of remaining crane positions of company A in the depot is 4.

[0152] ④ The score of the remaining capacity of hazardous chemicals transported by vehicle A1 in the storage yard: Since the maximum remaining capacity of E92 oil transported by vehicle A1 in the storage yard is 50,000m 3 Therefore, the remaining capacity of E92 oil transported by vehicle A1 in the depot is 10,000m 3 The hourly score is 20 points.

[0153] Following the above steps, calculate the demand type and quantity for B2 and C3 vehicles, the number of available crane slots within the depot owned by the vehicle's owner, and the scores for the remaining capacity of hazardous chemicals transported by the vehicle within the depot. Table 5 shows the demand type and quantity for off-site vehicles, the number of available crane slots within the depot owned by the vehicle's owner, and the scores for the remaining capacity of hazardous chemicals transported by the vehicle within the depot.

[0154] Table 5 Scoring of Off-site Vehicles

[0155]

[0156] (2) Calculate the final score of each hazardous chemical vehicle outside the warehouse and determine the entry priority order of A1, B2 and C3 vehicles outside the warehouse.

[0157] ① Calculate the final score F of cars A1, B2 and C3 respectively A1 、F B2 、F C3 .

[0158] F A1 =0.2×50+0.2×50+0.3×100+0.3×20=56 points

[0159] F B2 =0.2×50+0.2×25+0.3×75+0.3×25=45 points

[0160] F C3 =0.2×33+0.2×80+0.3×0+0.3×80=46.6 points

[0161] ② Sort hazardous chemical vehicles according to the final scores of A1, B2 and C3 vehicles, and determine which vehicles can enter the site immediately based on the number of available crane slots of the company to which the vehicle belongs in the warehouse, and determine the priority order of vehicle entry.

[0162] Table 6 Priority order of vehicles scheduled to enter the site

[0163] vehicle Final score (points) Entry priority order Is it possible to enter the market immediately? <![CDATA[A1]]> 56 1 yes <![CDATA[B2]]> 45 3 yes <![CDATA[C3]]> 46.6 2 no

[0164] (3) After determining the order of vehicle queues and the number of vehicles that can enter the port immediately, arrange the entry route, entry time, exit route and exit time of hazardous chemical vehicles in accordance with the operation status of hazardous chemical vehicles in the port yard and the number of crane positions. Since there is no hazardous chemical vehicle loading at the crane position of Company A in the port yard at this time, vehicle A1 can be arranged to enter the port immediately; since there is only one hazardous chemical vehicle loading at the crane position of Company B, and there are three vacant crane positions in the port yard, vehicle B2 can be arranged to enter the port immediately.

[0165] ① First, arrange for vehicle A1, which has the highest priority and can enter the site immediately, to enter the site. Assign this vehicle to the crane position with the shortest approach route, that is, the crane position on the right side of loading island No. 1. Set the entry time of vehicle A1 to the current time of 10:00:00.

[0166] ② Then arrange for vehicle B2, which ranks third in priority but can enter the yard immediately, to enter the yard and assign it to an available crane position that can be reserved in the yard, that is, the crane position on the left side of loading island No. 4. Based on the entry time of vehicle A1 and the headway between the entering vehicles, the entry time of vehicle C1 is determined to be 10:00:06.

[0167] ② Finally, the C3 vehicle, which has the second highest priority but cannot enter the site immediately, is arranged to enter the site. Since there are vehicles on all the crane positions belonging to the companies of Company C in the warehouse, the vehicle will be allocated to the crane position belonging to the hazardous chemicals vehicle that left the site first based on the loading status of the vehicles on all the crane positions and the priority order.

[0168] (4) Calculate the preparation time for all hazardous chemical vehicles in the hazardous chemical storage yard.

[0169] ① First, calculate how many hazardous chemical trucks can load their cargo at the crane position within 4 minutes. Based on the loading status of vehicles in the warehouse, we know that truck D1 can load its cargo within 4 minutes. Therefore, truck D1 is given priority to exit the warehouse first. Calculate the time it takes for truck D1 to be ready to exit the warehouse.

[0170] The D1 vehicle can leave the site immediately after loading the goods. The D1 vehicle’s preparation time T is determined. D1 .

[0171] T D1 =T+T 0D1 =10:04:00

[0172] ②After vehicle D1 leaves the hazardous chemicals storage yard, calculate the time T′ when vehicle D1 leaves the hazardous chemicals storage yard. D1 .

[0173]

[0174] Then calculate how many hazardous chemical trucks can complete loading at the crane position within the second 4 minutes, that is, within 10:09:40. Based on the loading status of vehicles in the warehouse, it is known that vehicles B1, C1, C2, and D2 can complete loading within the second 4 minutes within 10:09:40. Then calculate the preparation time for these four vehicles to leave.

[0175] Ⅰ According to the priority order B1>D2>C1>C2, the B1 car can be deployed immediately. Determine the preparation time T for the B1 car to be deployed. B1 .

[0176] T B1 =T′=10:05:40

[0177] Ⅱ Determine the preparation time T for the second priority car D2 D2 It is known that the distance l between B1 and the conflict point between B1 and D2 B1 is 1180m, and the distance between D2 and the conflict point B1 and D2 is l D2 Calculate the time T when B1 and D2 reach the collision point after loading. CB1 and T CD2 .

[0178]

[0179] Due to T CB1 >T CD2 , so D2 car waits at the crane position after loading the goods, and the waiting time is the time difference between the two cars driving to the conflict point. Determine the preparation time T of D2 car D2 .

[0180] T D2 =T′+T CB1 -T CD2 =10:07:00

[0181] III Determine the preparation time T for the C1 car, which ranks third in priority C1 It is known that the D2 car has a higher priority and is closer to the yard exit, so the C1 car and the D2 car will not interact with the D2 car if they start at the same time. Determine the preparation time T for the C1 car to leave. C1 .

[0182] T C1 =T D2 =10:07:00

[0183] IV Determine the preparation time T for the C2 vehicle, which is ranked fourth in priority. C2 It is known that the distance l between C1 and the conflict point between C1 and C2 C1 is 180m, and the distance between C2 and the conflict point between C1 and C2 is l C2 Calculate the time T for C1 and C2 to reach the collision point after loading. CC1 and T CC2 .

[0184]

[0185] Due to T CC2 >T CC1 , so car C2 can leave the station immediately after loading the goods. Determine the time T for car C2 to be ready to leave the station C2 .

[0186] T C2 =T′+T′ 0C2 =10:08:00

[0187] ③After C2 leaves the hazardous chemicals storage yard, calculate the time T′ when C2 leaves the hazardous chemicals storage yard. C2 .

[0188]

[0189] Then calculate how many hazardous chemical trucks can load the cargo at the crane position within the third 4 minutes, that is, within 10:16:20.

[0190] According to the calculated time for hazardous chemical vehicles to be ready to leave the port yard and the crane position situation, the entry route, entry time, exit route and exit time of other hazardous chemical vehicles scheduled to enter the yard are arranged in sequence. Therefore, the C3 vehicle, which ranks second in priority but cannot enter the yard immediately, is arranged to enter the yard. Since there are vehicles on all the crane positions of the company C in the yard, according to the time for all vehicles of the company C in the port hazardous chemical yard to be ready to leave, the C3 vehicle is assigned to the loading island where the C1 vehicle belongs, that is, the crane position on the right side of the finished oil loading island No. 8, and the time T for C3 to arrive at the designated crane position is determined. C3 10:07:00. Calculate the approach time T of vehicle C3 JC3 .

[0191]

[0192] The calculated loading times for cars A1, B2, and C3 are 10:10:00, 10:11:06, and 10:15:00, respectively. Therefore, cars A1, B2, and C3 can all be loaded within 10:16:20. Calculate the time it takes for these three cars to be ready for departure.

[0193] Ⅰ According to the priority order A1>C3>B2, car A1 can be deployed immediately. Determine the deployment time T of car A1. A1 .

[0194] T A1 =T″=10:12:20

[0195] Ⅱ Determine the preparation time for the second priority car C3. The distance l from C3 to the conflict point between C3 and A1 is known. C3 is 80m, and the distance between A1 and the conflict point C3 and A1 is l A1 Calculate the time T for vehicles C3 and A1 to reach the conflict point after loading the goods. CC3 and T CA1 .

[0196]

[0197] Due to T CC3 >T CA1 , so car C3 can leave the station immediately after loading the goods. Determine the preparation time T for car C3 to leave the station C3 .

[0198] T C3 =T″+T″ 0C3 =10:15:00

[0199] III Determine the preparation time for the B2 vehicle, which has the third highest priority. Given that the C3 vehicle has a higher priority and is closer to the yard exit, the B2 vehicle and the C3 vehicle will not interact with each other if they depart at the same time. Determine the preparation time for the B2 vehicle, T B2 .

[0200] T B2 =T C3 =10:15:00

[0201] The preparation time for vehicles B1, C1, C2, D1 and D2 in the depot is shown in Table 7.

[0202] Table 7 Timetable for hazardous chemicals vehicles to be ready for departure after loading

[0203] vehicle Preparation time <![CDATA[B1]]> 10：05：40 <![CDATA[C1]]> 10：07：00 <![CDATA[D1]]> 10：04：00 <![CDATA[D2]]> 10：07：00 <![CDATA[C2]]> 10：08：00

[0204] The timetable for hazardous chemical vehicles that have made appointments to enter the site to exit after loading is shown in Table 8.

[0205] Table 8 Schedule of hazardous chemicals vehicles leaving the site after loading

[0206] vehicle Entry time Arrival time at designated crane position Preparation time <![CDATA[A1]]> 10：00：00 10：02：00 10：12：20 <![CDATA[C3]]> 10：02：40 10：07：00 10：15：00 <![CDATA[B2]]> 10：00：06 10：06：06 10：15：00

[0207] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A method for organizing the traffic of hazardous chemicals vehicles in ports based on safety assurance and freight demand, characterized by: The following steps are involved: (1) Establish a hazardous chemicals port traffic data collection system to collect information related to hazardous chemicals vehicles inside and outside the port warehouse; (2) Establish a reservation and queuing system for hazardous chemicals port vehicles. For reserved vehicles, the reserved vehicles will be sorted according to the information of the vehicle's company, the hazardous chemicals it carries, and the freight demand; (3) After determining the queue order of vehicles, determine the hazardous chemical vehicles that can enter the site immediately based on the loading status of all corporate vehicles in the warehouse and the priority order of vehicles outside the warehouse that have made appointments to enter the site, and reasonably arrange the entry time, entry route, exit route and exit time of the vehicle according to the priority order of the hazardous chemical vehicles that can enter the site immediately; arrange the entry time, entry route, exit time and exit route of these vehicles according to the exit time of all hazardous chemical vehicles in the warehouse and the priority order of hazardous chemical vehicles that cannot enter the site immediately; in the event of an interaction due to failure to prepare for exit at the designated time, this emergency situation shall be resolved by formulating a safety guarantee mechanism for the exit of hazardous chemical vehicles when an interaction occurs.

2. The method for organizing port hazardous chemicals vehicle traffic based on safety assurance and freight demand according to claim 1 is characterized in that: The traffic data collection system includes a gate recording device and a monitoring device, wherein the gate recording device is placed at the entrance and exit of the port yard in the form of a horizontal bar. The gate recording device automatically opens when a hazardous chemical vehicle enters the port yard and records the license plate number, vehicle information, information about hazardous chemicals carried by the hazardous chemical vehicle, and the time the vehicle arrives at the port entrance and exit through a camera installed next to the gate; Monitoring equipment is installed at the entrances and exits of the warehouse, important internal intersections, high-frequency traffic accident sites, important warehouse facilities, and various crane positions. Through the monitoring equipment, the number and location information of all hazardous chemical vehicles working in the warehouse and the loading status of each hazardous chemical vehicle at the crane position can be monitored in real time.

3. The method for organizing port hazardous chemicals vehicle traffic based on safety assurance and freight demand according to claim 1 is characterized in that: The order of vehicles entering the venue is as follows: First, the demand type, demand quantity, number of vacant crane positions of the enterprise to which the vehicle belongs, and the remaining capacity of the hazardous chemicals transported by the vehicle in the warehouse are calculated for each hazardous chemical vehicle according to the information of the enterprise and hazardous chemicals to which each hazardous chemical vehicle that has made an appointment to enter the warehouse. Then, a weighted scoring method is used to assign different weight coefficients to the demand type, demand quantity, number of vacant crane positions of the enterprise to which the vehicle belongs, and the remaining capacity of the hazardous chemicals transported by the vehicle in the warehouse. The final score of each hazardous chemical vehicle is calculated by multiplying the demand type and quantity of each hazardous chemical vehicle, the number of vacant crane positions of the enterprise to which the vehicle belongs in the warehouse, and the remaining capacity score of the hazardous chemicals transported by the vehicle in the warehouse by the corresponding weight coefficient. When the remaining capacity of the hazardous chemicals transported by a hazardous chemical vehicle that has made an appointment to enter the warehouse is 0, the vehicle cannot enter the warehouse to load hazardous chemicals, and the final score of the hazardous chemical vehicle is 0. All hazardous chemical vehicles that have made an appointment to enter the warehouse are ranked, and the higher the score, the higher the priority.

4. The method for organizing port hazardous chemicals vehicle traffic based on safety assurance and freight demand according to claim 1 is characterized in that: Determine whether hazardous chemical vehicles can enter the site immediately, as well as the time and route of entry: 1) Determine whether the vehicle with the highest priority outside the depot can enter the depot immediately and arrange the entry route ① When all the crane positions of the enterprise to which the hazardous chemicals vehicle with the highest priority belongs are empty, and no vehicle of the enterprise is driving in the warehouse, the vehicle will be assigned to the crane position with the shortest approach route and will be arranged to enter the warehouse immediately; ② When there are vehicles on some of the crane slots of the enterprise to which the hazardous chemicals vehicle with the highest priority belongs, or there are vehicles of this enterprise driving in the warehouse, the vehicle will be allocated to an available crane slot that can be reserved in the warehouse and the vehicle will be arranged to enter the warehouse immediately; ③ When all crane positions of the enterprise to which the hazardous chemicals vehicle with the highest priority belongs are occupied by vehicles, the vehicle will be allocated to the crane position of the hazardous chemicals vehicle that left the site first based on the loading status and priority order of all the vehicles on the crane positions; 2) Follow the above steps to determine whether the second-priority hazardous chemical vehicle can enter the site immediately. Similarly, determine all vehicles outside the warehouse that can enter the site immediately and arrange the entry time and entry route of these hazardous chemical vehicles. Vehicles entering the site immediately must maintain a certain headway between the vehicles. s Therefore, after determining the entry time of the first hazardous chemical vehicle that can enter the site immediately, the entry time of each subsequent hazardous chemical vehicle that can enter the site immediately is determined based on the optimal headway.

5. The method for organizing port hazardous chemicals vehicle traffic based on safety assurance and freight demand according to claim 1 is characterized in that: The specific time arrangement for the preparation and exit of all hazardous chemical vehicles in the hazardous chemical storage yard is as follows: After completing their freight needs, hazardous chemical vehicles from different companies must exit in an orderly manner according to the prescribed exit routes and prescribed speeds; ① First, calculate the number of hazardous chemical trucks in the port hazardous chemical storage yard that can complete the loading of goods at the crane position within the T interval. Assume that there are X vehicles in the port storage yard that can complete the loading of goods within the time T; ② Sort the X vehicles in order of priority according to the vehicle priority calculation rules. Let the hazardous chemical vehicle with the highest priority leave the station first, and the vehicle with the lowest priority leave the station last. The hazardous chemical vehicle with the highest priority leaves the station immediately after loading the cargo. Calculate the preparation time T2 for the hazardous chemical vehicle with the highest priority to leave the station: T2=T1+T m Among them, T1 is the current time; T m The remaining loading time of vehicle m, which has the highest priority for hazardous chemicals; ③ When the hazardous chemicals vehicle m with the highest priority is closer to the warehouse exit; (I) When the hazardous chemicals vehicle with the highest priority is close to the depot exit and is loading quickly, the hazardous chemicals vehicle with the second highest priority will exit immediately after loading and prepare for exit time T3; T3=T1+T n Among them, T n T is the remaining loading time of vehicle n, which is the second-highest priority hazardous chemicals vehicle. m <T n ; (II) When the hazardous chemicals vehicle with the highest priority is close to the warehouse exit but is loading slowly, in order to prevent the two vehicles from interacting during driving, calculate the time T4 when the hazardous chemicals vehicle with the highest priority arrives at the conflict point; Calculate the time T5 when the hazardous chemicals vehicle with the second highest priority arrives at the conflict point; If T4 < T5, the hazardous chemicals vehicle with the second highest priority will depart immediately upon completion of loading, and the hazardous chemicals vehicle with the second highest priority will exit immediately upon completion of loading, and the exit time will be T3; T3=T1+T n If T4>T5, in order to prevent the two vehicles from interacting during driving, the hazardous chemicals vehicle with the second priority order needs to wait at the crane position after loading. The waiting time is the time difference between the two vehicles driving to the collision point after loading. The second priority hazardous chemicals vehicle is ready to leave at T3. T3=T1+T4-T5 ④ When the hazardous chemicals vehicle m with the highest priority is far away from the warehouse exit; (I) When the hazardous chemical vehicle with the highest priority is far from the warehouse exit but loads quickly, calculate the time T4 when the hazardous chemical vehicle with the highest priority arrives at the conflict point, and the time T5 when the hazardous chemical vehicle with the second highest priority arrives at the conflict point; If T4 is less than T5, the hazardous chemicals vehicle with the second highest priority will depart immediately after loading, and the second-highest priority hazardous chemicals vehicle will be ready to depart at T3; T3=T1+T n If T4>T5, in order to prevent the two vehicles from interacting during driving, the hazardous chemicals vehicle with the second priority order needs to wait at the crane position after loading. The waiting time is the time difference between the two vehicles driving to the collision point after loading. The second priority hazardous chemicals vehicle is ready to leave at T3. T3=T1+T4-T5 (II) When the hazardous chemicals vehicle with the highest priority is far from the warehouse exit but loading is slow, T m >T n In order to prevent the two vehicles from interacting during driving, the hazardous chemicals vehicle with the second priority order needs to wait at the crane position after loading. The waiting time is the time difference between the two vehicles driving to the collision point after loading. The second priority hazardous chemicals vehicle is ready to leave at T3. T3=T1+T4-T5 ⑤ Calculate the preparation time T of all vehicles in the first interval T according to the above steps. i After the vehicle with the lowest priority in the first interval T exits, the preparation time for exiting of all vehicles in the second interval T is calculated in sequence according to the above steps. Similarly, the preparation time for exiting of all vehicles in the hazardous chemicals warehouse T can be calculated. i .

6. The method for organizing port hazardous chemicals vehicle traffic based on safety assurance and freight demand according to claim 1 is characterized in that: The entry time arrangement for hazardous chemical vehicles that cannot enter the site immediately from outside the storage yard is as follows: Calculate the entry time of the hazardous chemical vehicle with the highest priority; ① Calculate the time t1 for the hazardous chemical vehicle with the highest priority to travel from the warehouse entrance to the designated crane position; ②Calculate the entry time t2 of the hazardous chemical vehicle with the highest priority; t2=T k -t1 Among them, T k When the hazardous chemicals vehicle with the highest priority in the reservation queue is assigned to a designated crane position, the vehicle at that crane position is ready to leave the crane position; After determining the entry time of the highest priority hazardous chemical vehicle that cannot enter the site immediately, on this basis, arrange the entry time of each hazardous chemical vehicle that cannot enter the site immediately. j and preparation time T i .

7. The method for organizing port hazardous chemicals vehicle traffic based on safety assurance and freight demand according to claim 1 is characterized in that: For interactions that occur when the user is not ready to leave the venue at the designated time, the emergency safety guarantee mechanism is as follows: If the number of hazardous chemical vehicles interacting in two directions is the same, the order of exit will be arranged according to the priority of the hazardous chemical vehicles interacting in the two directions. The hazardous chemical vehicles with higher priority will be arranged to exit first, and the vehicles with lower priority will be allowed to wait in place. If the priority of two vehicles is the same, one vehicle will be randomly arranged to exit first, and the other vehicle will wait in place. If the number of hazardous chemical vehicles interacting in the two directions is different, the order of exit shall be arranged according to the degree of concentration of the hazardous chemical vehicles interacting in the two directions. According to the principle of a small number of vehicles giving way to a large number of vehicles, the vehicle groups with a high degree of concentration shall be given priority for exit.

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