1 Characteristics and market analysis of battery forkliftThe battery electric forklift has the advantages of high energy conversion efficiency, small noise, no exhaust emissions, convenient control, etc., in the workshop, warehouses, food, pharmaceutical, microelectronics and instrumentation, etc., have a wide range of applications, Become a preferred tool for indoor material handling.
With the deep understanding of environmental pollution hazards, environmental protection has become the focus of the world. Therefore, the battery forklift for small noise, and the exhaust gas discharge will become the mainstream of the market. In addition, the automated storage system and large supermarkets have also stimulated the needs of the forklifts for indoor material handling machinery - battery forklifts. At present, the output of the forklift of the international battery has more than 40% of the total of the forklift. In developed countries such as Europe and the United States, the proportion of the battery forklifts reached 60%; in China, the ratio of the battery forklift is about 20%. The battery forklift has now broken through the limitations of the small tonnage operation, gradually by the indoor walking outdoor, and the market demand will rise year by year.
2 development trend of battery forklift technology
2.1 Drive motor and electric control development from DC to communication
The use of AC electronics can increase productivity, speed fast, improve the vehicle travel speed and door rack speed, and output torque at high speed. In the same way, it can extend the battery group single-class use time. In addition, the AC motorless brush and commutator do not have to be regularly maintained, so that the overall AC control system is cost effective. Linde, Jungheinrich, Hyster, Toyota and other well-known forklifts have launched an exchange of battery forklift products.
2.2 Opening of the vehicle development to the network
The CAN (Control Area Network) network is communicating between the various control modules of the battery forklift, and all electronic function components become a whole virtual unit, which can exchange control information in real time to implement synchronous control. Under the connection of 2 high-speed communication bus, it is very convenient to access information from other functional components.
The CAN bus is a serial data communication protocol developed to solve data exchange between many controls and test instruments in modern cars. The communication medium can be twisted pair, coaxial cable or optical fiber, and communication rate up to 1 Mbit / s. The biggest feature is to abolish the traditional station address encoding, and in order to encode the communication data block. The CAN protocol adopts CRC test and provides corresponding error handling functions to ensure the reliability of data communication.
Applying CAN on the battery forklift control system, the reliability and communication rate of data communication is improved, and the control system cost is reduced, greatly improves the control level of the battery forklift. LINDE, Anhui Forklift Group Co., Ltd. has successfully applied CAN bus technology to the battery forklift.
2.3 Steering system moves into electronic
The traditional battery forklift steering system adopts mechanical steering or hydraulic power steering. The disadvantage of mechanical steering is that the manipulation force is large, the operator is prone to fatigue; the disadvantage of hydraulic power steering is wasted to waste energy. The electron steering is not only small, but also more than 25% of the hydraulic power steering. At present, there are two main types of electronic power steering systems: a location feedback electronic power steering system, Jungheinrich, Anhui Forklift Group Co., Ltd. uses this electronic power steering system; another is a torque feedback electronic power steering system, Linde, TCM products use this electronic power steering system.
2.4 Manipulating the system development to the integration direction
As operators are increasing, integrated manipulation is a development trend. The so-called integrated manipulation is to complete all controls of the battery forklift with a manipulation handle: forklift advance / back, front movement of the door frame / back, the gantry rises / decline, the fork, the left side shift / right Side shift. In this way, the labor intensity of the operator can be reduced, thereby improving labor efficiency.
At present, Jungheinrich has used this comfort and convenient integrated manipulation system.
2.5 Brake system develops into electronic direction
In order to reduce braking impact, enhance applicability, the braking torque of the drive system can be required to promote the development of adjustable torque electromagnetic brakes. The adjustable moment brake consists of 1 spring press brake and electronic control device - the torque controller, which can also pass the torque controller to the brake while achieving the power torque adjustable function. Wearing is monitored, enhances the reliability of the system, reducing operation and maintenance costs. In addition, this adjustable torque brake can also set the CAN bus interface to implement remote diagnosis and control of the brake and network operation of braking control.
2.6 Application of Hydraulic Pump Motor Controller
Hydraulic pump motor controller can control the motor to achieve stepless speed regulation of the mounting / forward / back or otherwise, and the motor speed can be set to control the tilt / lateral speed. The hydraulic pump motor controller can save 25% energy, extend the battery pack single-class use time, reduce the heat of the hydraulic system. Battery forklifts such as Linde, Jungheinrich, TCM, Anhui Forklift Group Co., Ltd. use a hydraulic pump motor controller.
2.7 Falling Energy Recycling Technology
The decrease in the door frame uses the load-bearing energy recovery technology to achieve a decline in the gantry, which can save 5% energy. The principle of load-bearing energy recovery is: When the gantry is dropped, the hydraulic pump turns into a hydraulic motor, and the motor changes into a generator, converts the potential energy of the load into electric energy to perform energy to achieve energy.
3 conclude
The needs of users have driven the development of battery electric forklifts, saving energy, improving reliability, reducing usage and maintenance costs, and improving manipulation comfort into the development direction of the battery forklift.
Article from: http://www.brcpower.com/ Recommend: LiFePO4 Battery Manufacturer Energy storage battery Manufacturer Integrated machine energy storage battery series Manufacturer Lead lithium battery Manufacturer Outdoor Backup Battery Manufacturer Portable outdoor power supply Manufacturer Power battery Manufacturer Powerwall LiFePO4 Battery Manufacturer Battery rack Manufacturers Telecom LiFePO4 Battery Manufacturer Wall mounted battery storage Manufacturer China Lifepo4 Battery
