Refrigerated vehicle is a kind of closed van type transport vehicle used to maintain the temperature of frozen or fresh goods. Refrigerated vehicle is a special transport vehicle equipped with refrigeration unit and polyurethane insulation box. Refrigerated vehicles can be classified according to the manufacturer, chassis carrying capacity and compartment type.

Refrigerated vehicles are often used to transport frozen food (refrigerated vehicles), dairy products (dairy transport vehicles), vegetables and fruits (fresh transport vehicles), vaccine drugs (vaccine transport vehicles), etc.

Construction:

The refrigerator car is composed of the walking part of the chassis of the special vehicle, the heat insulation box body (generally made of polyurethane material, glass fiber reinforced plastic, color steel plate, stainless steel, etc.), the refrigeration unit, the temperature recorder in the compartment and other components. For the special requirements of the vehicle, such as the meat hook car, the meat hook, the cargo chute, the aluminum alloy guide rail, the ventilation slot and other options can be added.

Manufacturing technology of refrigerated compartment body:

1. This technology is widely used in large domestic refrigerated vehicle manufacturers, and the refrigerated vehicle manufactured by this technology has high thermal insulation performance.

2. The injection foam type is assembled in pieces.

3. The whole framework is injected with foam.

4. Vacuum adsorption bonding

Classification of refrigeration unit:

Refrigeration unit is divided into non independent refrigeration unit and independent refrigeration unit. Domestic units and imported units. Generally, the external refrigerator is used, while the internal refrigerator is used in a few Mini refrigerated vehicles. For refrigerated vehicles with lower temperature requirements, the cold plate inside the compartment can be adopted (the function is equivalent to evaporator).

classification

Classification by chassis manufacturer: BAIC Foton refrigerated vehicle (aoling, OMAC, times), Dongfeng refrigerated vehicle, Changan Star refrigerated vehicle, Qingling refrigerated vehicle, Jiangling refrigerated vehicle, Jianghuai refrigerated vehicle.

According to the chassis carrying capacity classification: mini refrigerator car, small refrigerator car, medium refrigerator car, large refrigerator car

Classification by car type: Bread type refrigerator car, van type refrigerator car, semi trailer refrigerator car

Development stage of refrigerated vehicle

The first stage

Integral injection of foam metal skin structure. The first generation of refrigerated vehicle manufacturers all adopt this process. This product has a lot of gold on the box

It is easy to form a large number of cold bridges due to the existence of materials; On the other hand, the defects in the foam insulation layer are not easy to find and the internal quality is not easy to guarantee; Moreover, because the foamed material is used as both thermal insulation material and binder, it is easy to produce defects such as weak bonding, poor thermal insulation effect and high heat leakage rate (second stage thermal conductivity).

The second stage

Integral injection of foamed FRP structure. It is used in the second and third generation refrigerated vehicle manufacturing enterprises. This product is improved on the basis of the first stage product. It has light weight, low heat leakage rate (thermal conductivity) and good thermal insulation effect. However, it has some defects, such as weak bonding and easy blistering on the outer skin of the car.

The third stage

Totally enclosed polyurethane plate bonded FRP structure. It is used in the second and third generation refrigerated vehicle manufacturing enterprises. This product is light in weight and has a high heat leakage rate

Low thermal conductivity and good thermal insulation effect. Using unsaturated polyester resin as binder, plus cushion, heat insulation material with rigid polyurethane foam, low thermal conductivity and high strength. Plate bonding with high strength, high sealing adhesive, forming a whole. The only defect is that the polyurethane has a large loss after cutting, so the material cost is high. Especially in the current situation of serious price increase of chemical raw materials, the production cost of car is higher and higher. The refrigerated vehicle with this structure occupies a dominant position in the domestic and foreign markets, and is also the process used by the refrigerated vehicle manufacturing enterprises in China.

Characteristics of refrigerated vehicle

The container of sealed refrigerated vehicle needs to be strictly sealed to reduce the heat exchange with the outside world, so as to keep the temperature in the refrigerated container low.

The refrigeration equipment is connected with the container and provides continuous refrigeration to ensure that the temperature of the container is within the allowable range of the goods.

Portability: generally, the goods transported by refrigerated trucks can not be stored for a long time. Although there are refrigeration equipment, they still need to be delivered to the destination quickly.

The container of the heat insulation refrigerator car is similar to the container, but it is made of the material with better heat insulation effect, which reduces the heat exchange.

Key equipment of refrigerator car

1. Refrigeration unit of refrigerator car

Refrigerated vehicle refrigeration unit: it is an important equipment to provide continuous "cold" for refrigerated vehicle containers. It is generally installed on the front and top of the container. It has the shape of an air conditioner, but it has stronger refrigeration capacity than the air conditioner of the same volume.

Refrigeration units are generally divided into two types, independent unit and non independent unit. The difference is that the independent unit generates electricity for maintenance work through another unit, while the non independent unit drives the refrigeration work of the unit through the engine power of the whole vehicle.

Selection of refrigerating unit for refrigerated vehicle

Generally, according to the volume of the refrigerated box and the temperature requirements of the transported goods, the refrigeration units with different power and refrigeration capacity are selected.

2. Refrigerator car body

The refrigeration unit of the refrigerator car is used to control the temperature, while the function of the compartment is to maintain the temperature. If the refrigeration unit is the energy provider, then the box is the energy storage. In the three major parts of the refrigerator car, the refrigeration unit and the insulation box body are the most important, and the chassis can be used as a small-scale insulation and cold storage.

Selection of thermal insulation box

Box selection generally follows several points: good thermal insulation performance, light weight, not easy to damage.

Refrigerator car positioning system

Refrigerated transport vehicle positioning management system is an open positioning supervision platform integrating GPS / temperature detection technology, electronic map and wireless transmission technology. Realize the effective tracking and positioning management of refrigerated vehicle resources, and integrate the positioning information with the business resources of the enterprise. Refrigerated vehicle positioning management system not only provides an efficient and flexible management tool for refrigerated enterprises and field personnel, but also creates a new and efficient scientific mode for refrigerated enterprises to manage and control refrigerated vehicle resources. This product is suitable for the collection, transmission, recording and overrun alarm of the temperature data in the refrigerated compartment, and is an ideal tool for the temperature monitoring of the transport truck / cargo in the refrigerated industry.

In this regard, according to the specific needs of enterprises, "RFID cold chain temperature management system" and "GPS + temperature monitoring cold chain management system" have been developed. Through the organic combination of advanced RFID technology, GPS technology, wireless communication technology and temperature sensing technology, in the logistics management and production process management of fresh food and drugs that need appropriate temperature management to ensure the quality, Record the temperature change on "RFID tag with temperature sensor" or "real-time" to the enterprise management platform through "terminal with GPS and temperature sensing function combined with wireless communication technology", and manage the freshness and quality of products in detail and real-time. It can easily solve the problem of quality control in the process of food circulation.