Research on modular design of the hottest stacker

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Research on modular design of stacker

roadway stacker crane (hereinafter referred to as stacker) is the core product of logistics equipment. Compared with foreign technology, at present, there are gaps in technical parameters, product coverage, technical stability and industrial scale of stacker products in China. The output of foreign well-known stacker manufacturers is basically more than 200 sets/year, which basically realizes the batch production of product parts and the serialization and modularization of stacker design and manufacturing; However, domestic manufacturing enterprises are relatively small, with an annual output of less than 100 units/year, and are still in the stage of promoting design and production with project contracts. There is less research on the industrialization of stackers, and the comprehensive competitiveness and technical level of products are relatively low. In recent years, the owners of major projects such as Shanghai Haiyan logistics system and Yili dairy have all chosen foreign products with relatively mature industrialization and technology after comprehensive consideration, which shows that China's logistics equipment manufacturing industry is in a disadvantageous position in the technical level and industry scale competition. In order to enhance the competitive level of the industry, it is a very urgent task to carry out industrialization research, and modular design is an effective way to realize industrialization and quickly respond to the market

different data needs do not click here to add pictures to clarify the connotation and characteristics of the same fixture 1 modern modular design

modular design is a modern design method that analyzes the functions of products with different functions or the same functions, different performances and different specifications within a certain range, divides and designs a series of functional modules, and forms different products through the selection and combination of modules to meet the different needs of the market. The design process of new products is no longer a bottom-up process based on rules and empirical knowledge, which is an important attachment connecting the sample to the force adding device of the experimental machine, but a top-down task driven approach. The use of well planned, standardized or easily modified parts modules can reduce costs and improve speed. Modern modular design has the following characteristics:

(1) realize a complete product definition. Modular design originates from market research and product function analysis, and forms a product family through module combination, and the module system can timely assemble or redesign individual modules according to different design requirements and the development of new technology, so that the product has higher flexibility in structure and performance and a complete definition of the product

(2) it can shorten the design and trial production cycle. According to the requirements of users, select modules for product configuration design to shorten the design and trial production cycle, which is suitable for the manufacturing and production of small batch, multi variety and multi-function equipment

(3) the product has stable and reliable performance, convenient maintenance and low cost. Due to the high degree of standardization of components, it is conducive to the application of advanced processing and manufacturing technology, so that the product has good performance and high reliability. After adopting modular design, the internal diversification of products will be minimized. While meeting the functional requirements of users to the greatest extent, the diversification characteristics of products will not be reduced, so that enterprises can achieve mass customization and help reduce costs

(4) the process of realizing knowledge management and integrated design modular design is the normative process of product structure design of Rmn corrugated core paper ring compression strength test value (n/0.152m). The planning and implementation of the module requires the establishment of module interface and product knowledge information. The whole product modular design process runs through the process of product knowledge creation and management. Through the effective management of product knowledge, it is beneficial for designers to continuously optimize and improve the module. Modular design combined with product data management (PDM) technology makes it easier to establish the information connection between modules and form an extensible expert system

2 stacker and modular design

see Figure 1 for typical single column stacker structure. It is composed of ground rail 1, lower beam 2, loading platform 3, fork mechanism 4, lifting pulley 5, overhead rail 6, column 7, control cabinet 8, lifting motor 9, traveling mechanism and drive wheel 10. For the stacker system, it is difficult to assemble and combine products with traditional modular principles and methods, and it is not possible to simply scale products with parametric design. Instead, its structural type and size should be determined according to the needs of the three-dimensional warehouse system, because of its inherent large inertia, large-span structural parameter changes and motion parameter changes, There are strict requirements for the performance of each component module (such as stiffness, strength, stability, reliability, etc.), so that modules with the same or similar functions may have great differences in structure, and according to the changes of parameters, the structural forms of module models vary, and the traditional modular design cannot meet these requirements, Therefore, the modular design method based on template module is introduced to combine the design characteristics of stacker system with the advantages of modular design

Figure 1 stacker 23 Automatic diagnosis function structure

the modular design of stacker products based on template module is an extension of the traditional modular design. Its core idea is to consider the influence of stacker load characteristics, material properties, stress conditions, functional configuration and motion parameters on its structural form, and take the structural strength, stiffness, functional parameters and motion parameters of stacker as the target parameters of module design, Pass the design requirements to the module through these parameters. The module that realizes parameter expression is called template. It is an abstract module rather than a specific available module. It is a general model of a class of functional modules. The template integrates the similar design characteristics of a large number of examples, and builds the template into a product structure model. In the actual design, the product design parameters are extracted from the design requirements, the template module is assigned, and the instantiated product is obtained within the framework of the product mechanism model, so as to quickly complete the product design of the stacker. Template is the basis of product modular design, so we must ensure the rationality of template design. A qualified template module should integrate design knowledge and reserve interfaces for redesign and model expansion. These interfaces include template attribute information, connection information and parameter information. Changing the information value of each interface can change the characteristics of the template. The interface information should have a mapping relationship with the stacker design knowledge system, and its value should be determined according to the product knowledge system and design standards. The modular design of stacker mainly includes the reasonable division of functional modules and the universal and standardized design of mechanical interface between modules

(1) division, synthesis and standardization of modules how to correctly divide functional modules is one of the main research contents of stacker design. Correct and reasonable module division can simplify the structure of equipment, reduce the reconstruction frequency of equipment, improve the accuracy matching between modules, reduce the workload of reconstruction operation, and beautify the appearance of equipment. In addition, the standardization of modules is also extremely important. Only by realizing standardization, it is convenient to organize professional mass production and realize the exchange of modules from different manufacturers

(2) mechanical interface standardization to be widely used, the interface standardization of various modules must be considered in the design, including mechanical, hydraulic, lubrication, cooling, electric control joints, etc. Modular design theory has appeared for decades, but it has not been widely used. The main reason is that the research of mechanical interface is not enough. People often focus on the division, design and synthesis of modules. In fact, whether modular design can be widely used has a great relationship with the design and standardization of mechanical interfaces. The research on interface standardization mainly includes the accuracy, stability and reliability of interface combination, interface standardization, rapidity and convenience of module replacement, etc

3 stacker function analysis and module division

according to the basic idea of modular design, carry out market research and Analysis on stacker products, and integrate manufacturing and assembly factors, summarize and sort out the design parameters that affect the stacker function, determine the product parameter range and main parameters, and divide modules according to the stacker function, such as establishing drive module, underframe support module, column module, pallet module Control system templates and other first-class modules, and longitudinally refine each major module, optimize the structure of each module in combination with the stacker that has been produced, and fix the structural form. On this basis, describe the parameters of the module, and establish the template of each module. According to the parameter relationship between templates, the product structure model of stacker is built, the parameter relationship between templates is established, and a stacker design expert system with information interface and use rules is formed. The template is instantiated through parameter assignment to realize the modular design of stacker. Based on the above analysis and combined with the existing design experience, the design parameters of the stacker are summarized as follows:

(1) functional parameters stacker structural form, operation mode, storage and retrieval mode, cargo location form, cargo type and equipment picking mode, etc. The functional parameters are described by qualitative parameters, as shown in Table 1

(2) structural parameters: cargo size, rated load capacity, height of stacker, etc. The structural parameters are described by quantitative parameters. The continuous values of cargo size, load capacity and stacker height are discretized and optimized, as shown in Table 2

(3) running speed and acceleration of motion parameters in X, y and Z directions. The motion parameters are described by quantitative parameters, and the continuous values of speed and acceleration are discretized and optimized, as shown in table *. The modular design of stacker needs to build a product structure function tree on the basis of function analysis, divide modules according to the function structure tree, complete the mapping from function to structure through design parameters, and establish the attribute relationship between modules and products and the connection and correlation between modules. The establishment of stacker product module system and product configuration management are based on the description of module parameters. The division of stacker modules is shown in Table 4

4 product configuration design of stacker based on PDM

the modular design process of stacker is the process of product structure design specification, and the establishment and management of product knowledge is an important part of modular design. The whole product modular design process runs through the creation and management of product knowledge. The whole product series of the stacker is planned from top to bottom, and the functional modules in line with the principle of modular design are designed. By establishing the modular product structure model, the function and structure parameters of the module are described with parameters. Each module can be expressed and identified through functional parameters and structural parameters, which has the conditions to quickly design new products through the selection and synthesis of functional modules according to the requirements of users in the PDM Environment. For example, taking PDM as the design platform of the whole modular design can realize the configuration design of stacker products and computer-aided management of modular products. The information in the planning and implementation process of stacker modules can be effectively managed through PDM technology, and finally realize the configuration design of stacker products

product configuration is an important design means in the rapid design stage, which provides options for salespeople to customize customers' personalized needs. The product model is finalized according to the options selected by the customer, and the product is displayed and the price is provided to the customer. If the customer is satisfied, it will generate the product manufacturing model used by the production department; On the contrary, it will provide design examples for designers, so that customized design has a new starting point. In order to realize product configuration, the product development stage should consider and meet the following requirements

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