Intelligent three-dimensional warehouse network solution

Preface

With the rapid development of science and technology and the advancement of economic globalization, modern warehousing and logistics are playing an increasingly important role in enterprises and supply chains. The intelligent three-dimensional warehouse is a modern warehousing system that integrates automation, intelligence and information technology. It mainly consists of shelves, shuttles, stackers, dispatch control systems and management systems. It realizes automatic storage and removal of goods through computer control and network communication. The three-dimensional warehouse has the characteristics of high-density storage, fast access, and intelligent management, which can effectively improve logistics efficiency and reduce operating costs. Among them, stackers and circular shuttle vehicles (RGV) are key components of the three-dimensional warehouse. Reasonable lane layout and the application of circular multi-pass RGV play an important role in improving warehousing efficiency and reducing operating costs.

Common communication solutions for intelligent warehouses

2.1 wireless optical communications

Wireless optical communication is a technology that uses invisible electromagnetic waves such as visible light or infrared light as information transmission media to achieve high-speed wireless data transmission and communication. Typically, wireless optical communications use LEDs or lasers as transmitters, use optoelectronic devices to receive signals and convert them into electrical signals, and complete data decoding at the receiving end.

The advantages and disadvantages of wireless optical communication are obvious. The advantages are high transmission rate, low interference and strong confidentiality. The disadvantages are that it can only communicate in a point-to-point straight line, the humidity and dust in the warehouse affect the beam, the shaking of the equipment affects the beam, the transmission distance is short, the cost is expensive, and the delivery cycle is long. At present, the common optical communication brands on the market are mainly foreign brands. Such as Leuze, Pepperl+Fuchs, Siemens, SIK, etc.

2.2 Leakage cable communication

Leaky wave communication technology is a linear antenna transmission technology that combines the characteristics of small signal feeder transmission loss and radio frequency signal diffraction. When working, a cone-shaped signal area is radiated around the leaky wave feeder cable. Wireless clients and wireless access points can establish communication links with the help of this signal area.

Advantages of leaky wave communication technology: This technology was introduced to China earlier and has been adopted by some leading companies; the technology is relatively mature. Its shortcomings are also obvious, including the need to lay special leaky cables, the installation accuracy, equipment cost and construction cost are very high, the leaky cables need to be laid in sections, which may cause problems such as roaming disconnections, and they are easily affected by other co-frequency interference in the environment. communication.

2.3、Industrial Wireless network communications

Industrial wireless network refers to a wireless communication technology used in industrial automation systems. Its main feature is that it can meet the special needs of industrial environments, such as strong anti-interference, high reliability, low latency, etc. Compared with traditional enterprise-level wireless networks, industrial wireless networks have a wider communication range, can operate continuously 24 hours a day, and can support real-time interactive communication with more devices, especially mobile devices, in motion. Currently, the main industrial wireless brands on the market include Siemens, Phoenix, Mosaic, Wondertek Technology, etc.

Case analysis

3.1 Project description

A three-dimensional warehouse in South China is about 220 meters long, 70 meters wide, 25 meters high, and has a volume of about 385,000 cubic meters. The three-dimensional warehouse uses high-strength steel shelves with a height of about 22 meters and a length of about 200 meters; it is equipped with 18 high-rise tunnel stackers (hereinafter referred to as stackers) with a tunnel length of about 200 meters; it is equipped with 18 L-shaped ring stackers Rail shuttle vehicle (hereinafter referred to as RGV), the RGV track is L-shaped and about 300 meters long;

Require: 18 stackers and 18 RGVs must be connected to the industrial Ethernet to communicate with the host computer in real time, and receive real-time scheduling from the WMS and WCS systems to achieve accurate intelligent entry and exit tasks.

3.2 Design

3.2.1Stacker communication

Each tunnel uses two Grid Technology WD-G40-RS-DA12V13VH: Attached Picture (3) Industrial-grade waterproof and dustproof integrated Wireless Bridge, and one WD-G40A-RS-DA12V13VH is set up at one end of the tunnel: Attached Picture (3) As the transmitter, the client WD-G40C-RS-DA12V13VH is installed on the stacker as the receiver to build a pair of dual-band redundant wireless communication networks. The integrated network bridge has a built-in 13dBi high-gain directional antenna, a self-developed dual-channel redundant protocol stack, and 2.4G and 5G dual-frequency real-time redundant communication to ensure communication security, greatly improve the anti-interference ability, and ensure 18 stacker crane PLCs. Interact with real-time data from WMS/WCS systems.

3.2.2 RGV multi-pass communication

Set up 5 Grid Technology WD-G40A in the RGV operating area: Attached Picture (4) Dual-band industrial-grade wireless AP to provide Wi-Fi coverage in the operating area without blind spots, and install one WD-G40C on each RGV: Attached Picture (5 ) Dual-band industrial-grade wireless client to build a dual-band intelligent seamless roaming network. WD-G40 uses a high-performance quad-core processor, supports IEEE802.11 a/b/g/n/ac MIMO wave2 technology, 2.4G and 5G dual-channel baseband, data transmission rate up to 1267Mbps, high transmit power, high sensitivity, advanced With the dual-band roaming technology, the client device can seamlessly roam to the AP with the strongest signal, and the maximum roaming time is less than 50ms, ensuring real-time data interaction between 18 RGV PLCs and WMS/WCS systems.

3.2.3 Features of Kunshan Wondertek Technology’s industrial wireless

Ⅰ. Strong anti-interference: The industrial-grade Wi-Fi solution uses industrial-grade hardware equipment and technology, integrated power supply and antenna isolation design, which can maintain a stable wireless connection in harsh industrial environments and prevent internal and external electromagnetic interference.

Ⅱ. High reliability Industrial-grade chip solution, wide temperature (-40℃~75℃) and wide voltage (12V~57VDC) support ensures high-speed wireless communication in harsh high and low temperature scenarios.

Ⅲ. Ultra-low latency: Supports IEEE802.11 a/b/g/n/ac MIMO wave2 with a maximum transmission rate of 1267Mbps and can operate on the 2.4GHz and 5 GHz frequency bands. Dual-channel baseband ensures the real-time nature of wireless connections.

IV. Dual-band intelligent seamless roaming: With advanced dual-band roaming technology, the Client device can seamlessly roam to the AP with the strongest signal, and the maximum roaming time is less than 50ms.

Ⅴ. Support industrial protocols such as PROFINET, EtherNet/IP™, Modbus TCP/IP, etc., and support various PLCs, Siemens, Mitsubishi, etc.

Plan operation

Three months since the project was completed, the system has been operating stably and has received unanimous praise from all parties involved in the project. As a professional manufacturer of industrial-grade communication equipment, Grid Technology provides expert-level communication solutions for a wide range of industrial sites, ensuring stable communication in harsh industrial environments and making customers very satisfied.

Provide solutions for industrial intelligent manufacturing

Kunshan Network Technology Co., Ltd. is a high-tech enterprise focusing on the research and development and production of industrial communication products. Over the past 15 years, we have accumulated rich experience in R&D, production and massive industrial field applications. Localized production ensures that production capacity and supply are delivered on schedule. We have complete R&D, production and quality control systems, and we have a strong pre-sales, in-sales and after-sales support team. The 5-year long warranty gives you peace of mind.