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School Locker 3d Model Free Download

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These locks are registered to a particular business or school and the keys are reserved for their use only. It is possible to purchase up to 12 additional keys if you are a registered end user of the school or institution.


Built-In Combination Deadbolt Locker Locks (Master Lock #1670) are the highest security, built-in combination deadbolt lock for lift handle, turn handle and single-point latch/box horizontal latch lockers. These lockers provide ideal safety measures for mesh or ventilated lockers where the back of the lock is accessible. Use these locks to protect against prying and theft.



school locker 3d model free download

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Many scholars have studied self-service parcel lockers. Punakivi et al. [3] proposed two main modes of unattended reception box and delivery boxes and found that an unattended reception box allowed greater cost savings. Shi et al. [4] proposed the use of automatic logistic terminal equipment in a campus express delivery system and verified the implementation feasibility of automatic logistics terminal equipment through qualitative and quantitative analyses. The present research mostly focused on the development status of smart express locker mode, promotion of the mode, and development of countermeasures to problems, while little research focused on parcel locker location. Li and Lu [5] established a model that works out the quantity and optimal layout of the intelligent self-service locker on a campus based on clustering analysis, in which 0-1 integer programming model and other methods were considered. Liu [6] pointed out that the self-service terminal belongs to a special distribution node, and the location of the self-service terminal is essentially a discrete multidistribution node location problem. The parcel locker can be regarded as a type of special self-service terminal. Therefore, the parcel locker location (in the present work) is also equivalent to a discrete facility location problem.


In a single-level model, the two variables are required to be solved simultaneously, while in practice, the location and demand distribution decisions are decided by two different decision-makers. Consumer demand, as distributed among parcel lockers, when determined by planners, is unreasonable: in fact, consumers always choose parcel lockers based on their own habits, and this kind of behaviour is very stochastic. In addition, the planner can only estimate the location of parcel lockers based on consumer demand, and at the same time, different location patterns will affect the distribution of consumer demand. The location problems of logistics parcel lockers can be represented as a Leader-Follower or Stackelberg game where the decision managers are the leaders, and the consumers are the followers who choose the parcel lockers freely; however, bilevel programming (BLP) can reflect the interaction among the decision levels in the location of parcel lockers and can solve the contradiction between the goals pursued by enterprises and consumers. It can also clearly reflect the real situation on both the supply and demand sides, making the location model a closer fit to reality. Therefore, it is suitable to represent the location problems with BLP models. Although the facility location problem has been studied widely, little attention has been paid to the location model problem using a BLP model [13].


In the current work, we focus on the usage of parcel lockers (or shared reception boxes) as a solution to the last mile logistics problem. A parcel locker is a group of lockers, sited in apartment blocks, workplaces, railway stations, and so on. As the lockers have electronic locks with variable opening codes, they can be used by different consumers, at their convenience. Our work is the first attempt to develop a quantitative approach based on GIS data to determine their optimal locations, aimed at solving real-life hierarchical facility location problems.


(1)The locations of regional distribution centres, parcel lockers, and consumers are known(2)The number of regional distribution centres, the locations of the candidate parcel lockers, and the demand of each customer point are known(3)All regional distribution centres and parcel lockers have maximum processing capacity(4)Each consumer can only go to a fixed parcel locker for self-service(5)Each parcel can only be sent to a fixed parcel locker, which is nearest to customer points






Herein, the upper level of the BLP is designed to meet the demands of consumers at various locations with the minimum cost. The lower level represents consumer willingness to use different parcel lockers, and its objective is to minimise the travel cost of each consumer. In addition, we assume that the competition between new and old parcel lockers is not considered.


From the perspective of enterprise, the upper-model factors mainly include the construction cost, operation cost, transportation cost, and the penalty cost caused by repetitive delivery due to parcels delayed in parcel lockers. The specific analysis is as follows.


The construction cost refers to the purchase cost, labour cost, and land lease cost of the parcel lockers. Such costs will change by location, but the selected area in this scheme is not much large, so it is regarded as a fixed value. In addition, the construction cost also includes the depreciation cost and maintenance cost of parcel lockers, which are all fixed costs, meaning that they will not change due to their operational status. The expression is as follows:


For logistics enterprises, the operating cost of parcel lockers consists of the usage fee and maintenance cost (including parcel lockers repairing and cleaning). It depends mainly on the number of cells used by express-delivery staff. The expression is as follows:


Due to the self-service nature of parcel lockers, consumers need to complete the picking process themselves. Therefore, the transportation cost is only incurred from regional distribution centres to parcel lockers. Transportation cost can be determined by parcel quantity, distance, and transportation cost per unit (including labour cost and fuel cost). The expression is as follows:


Penalty cost refers to the cost that the express company needs to bear when the maximum capacity of the parcel locker fails to meet consumer demand . fd represents unit penalty cost per parcel. For example, if all the parcel lockers are full, the courier has to wait and deliver the parcels for the second time. The expression is as follows:


The lower-level problem represents customer choice behaviours and the demand distributed among parcel lockers; that is to say, each customer assigns their demand through the parcel lockers to minimise their total cost.


Newly added parcel lockers are mainly found to be located near the dormitory of Hunan silk factory, Enrui apartment, and Youyou Kindergarten in Tianxin District. The locations correspond to those of people who often shop online.


Figures 5 and 6 illustrate the connection among three parties: customer, parcel locker, and regional distribution centre. Figure 5 shows the upper-level assignment relationship, involving regional distribution centres and parcel lockers, while Figure 6 shows the lower-level assignment relationship, involving parcel lockers and customer points.


In addition, Figure 5 demonstrates that multiple distribution centres share a parcel locker. According to the actual situation, the research area is located at the junction of three distribution centres (see Figure 5). Figure 6 shows that the customer and the parcel locker conform to a one-to-one relationship, which conforms to the principle that customers are accustomed to collecting parcels from the nearest parcel locker. The result also validates the correctness of the logic of the location of parcel lockers in the algorithm.


This opens the door to further research. On the one hand, to deal with the dynamic aspects of the problem, we can cooperate with e-commerce platforms to get more user-demand data. Another possible solution is to couple our optimisation model with a simulation model and to optimise the location problem of parcel lockers within a certain area over a certain time period in a dynamic manner.


Designed to elevate the experience for facilities and users, the Master Lock 3685 Electronic Built-In Locker Lock combines a modern design with premium materials to offer improved functionality. The Electronic Built-In Locker Lock offers a new level of innovation with its high-visibility display screen for intuitive operation, long battery life to reduce operating costs, and anti-jamming features for reliable security. Suitable for most lockers - metal, wood or phenolic. Reversible design works on lockers with left or right hinges. Easy to retrofit. Strike plate included.


"Discover the perfect solution for your storage needs with our secure and convenient storage lockers. Whether you're decluttering your home, moving, or just need extra space, our storage lockers offer peace of mind and easy access to your belongings. Reserve your locker today and enjoy a clutter-free life!"


Available with five combination changes for security year to year. Master key controlled. Stainless steel escutcheon plate. Use deadbolt models for all but box lockers, which use spring bolts. Available in LH & RH models.


Available with and without master keying. 3 number dialing. Rust resistant. Fits box lockers, die-cast handles, recessed handles, cremone handles, and basket racks. Note: For proper fit and security, the padlock shackle must have a diameter of 9/32" or 5/16" and a distance of .75" to .81" between the top of the case and the underside of the shackle when in the locked position.


Ideal for public or private applications that require security with the assurance that keys will be returned or as a revenue producer. Coin locks fit most Penco lockers. Available in 2 types: coin return and coin collection. Not available for Defiant lockers.


Padlocks-Combination Type: Master keyed combination type padlocks shall be provided for all locker doors. Locks shall have three-number combination dialing. Master key shall be provided to the owner.

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School Locker 3d Model Free Download Partenia Urtiaga <parteniaurtiaga@gmail.com> - 2024-01-04 22:43 -0800

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