Medical Devices

The technical background of an electric explosion-proof forklift
Electric explosion-proof forklift technology began in the 1960s and in a few developed countries in Europe and the United States, on the one hand, developed countries are increasing the pressure of eco-environmental protection and energy resources, electric forklift entered the stage of development, On the other hand, with the enhancement of safety awareness, safety performance of the production of dangerous goods storage and transportation equipment requirements the higher the forklift as a storage device must have a safety explosion-proof technical performance, and thus the explosion-proof forklift first in economically developed countries start-up and development.
Electric explosion-proof forklift trucks in the 1960s and 1970s due to the limitations, when the level of electronic technology and electric forklift manufacturing technology, resulting in electric forklift trucks running current, short time energy storage, high temperature circuit explosion-proof controllable point defects explosion-proof means only take flameproof, increased safety of the approach, such a machine in the course of a large current, temperature and aging fast, and use a short time, artificial human responsibility to maintain a multi-and operator requirements high.
Electric explosion-proof forklift into the 1990s, with the level of development of electronic technology and raise the level of electric forklift manufacturing technology and the development and application of the AC, the developed countries electric explosion-proof forklift toward the high-intelligent control technology high operating performance, high security, the direction of the road.
Second, the domestic electric explosion-proof forklift technology status quo
Before the 1990s, the late start due to the development of the domestic electric explosion-proof forklift, technical standards are more backward, so the first phase of the electric explosion-proof forklift only in the ordinary electric forklift, flameproof, increased safety, handling electric forklift poor technical performance standard of proof techniques for the large gap of imperfect electrical components standards with international standards.
The technical features of the first phase of the electric explosion-proof forklift:
1, the system consists of three motors constitute a basic run loop, namely: walking the motor circuit to enhance the motor circuit, turning the motor circuit, its operation principle is that each back to the routing of each switch-controlled walk contact to enhance the contact device, steering contactor the motor power to the working state.
2, the whole DC system, the excitation of the motor for SACS to enhance motor and steering motor excitation mode for the compound excitation.
3, the electrical system flameproof technical processing can not swap batteries, batteries for increased safety junction box wiring fixed brake in the form of brake shoe style, the whole insulating properties by artificial maintenance treatment, no overload, current limiting protection.
The above technical characteristics lead to a complex line of electric explosion-proof forklift controllable point machine running current, temperature rise, electrical easy to damage.
Since the 1990s, especially into the twenty-first century, the second phase of the electric explosion-proof forklift electric forklift in the whole manufacturing level, and varying degrees of domestic parts manufacturing level has been improved, the technology of the DC system formed a diverse, intelligent explosion-proof technology has improved, better domestic explosion-proof standards, docking with the international standards faster progress of work.
The technical features of the second phase of the electric explosion-proof forklift:
1, the whole DC system a walk by walking controller and pump controller, control motor and a pump motor to constitute a basic run loop, intelligent and improved protection overload current limit can be set according to operating conditions set The controller program parameter controls the motor run.
, Which encourage systems with limited energy regeneration, and anti-decline in the braking function, storage time, a certain increase.
3, the whole flameproof, intrinsically safe, increased safety explosion-proof technologies constitute some explosion-proof electrical components, technology development, not only small size and easy installation, this makes the design more reasonable appearance.
The above technical features remain the system running current, temperature rise of the defect, and the use of the brake shoe brake is easy to produce sparks and temperature.
Domestic explosion-proof electric forklift trucks in the past two years into the stage of the third stage of the explosion-proof AC control system technology, the exchange control system has good dynamic performance and feature advantages, more suitable for the electric explosion-proof vehicles with hydraulic brake formal wet brake, explosion-proof a greater degree of technical standards with international standards, explosion-proof electric forklift technology has been improved so much.
The technical features of the third phase of the electric explosion-proof forklift:
1, the exchange control system with low speed constant torque control and high-speed constant power control, it has a good dynamic performance, and energy recovery ramp anti downturn, the deceleration function.
2 in the structure of the AC motor does not use contacts and carbon brushes, so there is no need to clean up and replace the carbon brush has a maintenance-free, which makes explosion-proof security to improve.
3, through the control of two explosion-proof AC motor temperature sensing and control systems, explosion-proof forklift heat l and heat drop two to control the operating conditions, both to improve temperature control capability of the explosion-proof forklift trucks, but also a large extent to ensure the normal operation of the machine.
4, with hydraulic wet brake in the brake form, to avoid the generation of brake sparks and high temperature, improving the overall explosion-proof performance.
More than technical features with high transmission efficiency, current, and low temperature rise, motor maintenance-free and good braking performance, no spark, steady rise and low, to improve the overall performance, but also relative to ensure the machine in the explosion-proof environment longer period of time.
In summary, the development of the electric explosion-proof forklift has gone through three stages, three stages of technology development by electric forklift technology development and the development of explosion-proof technology is the combination of current domestic electric explosion-proof forklift still the second stage, into the third phase of the electric explosion-proof forklift manufacturer, only Zhejiang Jiali Technology Co., Ltd. has recently developed a single motor explosion-proof AC hydraulic electric forklift trucks and motor explosion-proof AC control system hydraulic braking of electric forklifts, has not only created a domestic electric explosion-proof forklift independent research and development road with independent intellectual property rights, and to fill the domestic non-explosion-proof AC control technology of electric forklift blank.
Design concept and direction of technology, electric explosion-proof forklift
At present, electric explosion-proof forklift There are two types: machine design and manufacture of explosion-proof modification in the ordinary electric forklift, are quite different and because of the technical performance of the design concept of electric explosion-proof forklift, so according to the technical characteristics of the electric explosion-proof forklift and technical standards to determine the scientific thinking.
1, the integrity of the design concept of the electric explosion-proof forklift
Have summarized in one sentence the contradictions caused by the backwardness of the design concept of the electric explosion-proof forklift, electric forklift is the first require a good, ask for a good explosion-proof performance; or require a good explosion-proof performance, and then require a good electric forklift \". This sentence illustrates two problems exist in the domestic electric explosion-proof forklift: First, due to poor electric forklift technology performance, even if there is a good proof design is useless, because the performance of the whole fail to meet requirements; electric forklift performance, but after the explosion-proof modification caused by the decline in overall performance. It is the above reasons we need to establish the integrity of the design concept of the electric explosion-proof forklift, good electric forklift design and advanced explosion-proof design combines advanced electric explosion-proof forklift technical standards, as one, in order to create a superior integrity products. To do this you must follow these design principles.
a) the design performance of the electric explosion-proof forklift trucks is higher than the ordinary electric forklift design performance requirements.
Electric explosion-proof forklift that require high technical standards of the machine insulation, electrical conductivity, temperature, short circuit, current, etc., such as motors, electrical components are explosion-proof body, poor heat dissipation caused by temperature rise, if the circuit design is unreasonable is also easy to cause a short circuit, if the whole of the load current, will produce over-current, temperature rise, the wire is easy to aging, the decline in insulation and other issues, resulting in poor performance of explosion-proof electric explosion-proof forklift, even if the means of protection to stop run, will result in the short time of operation of the machine, maintain a long time, life is short defects.
The technical performance of the ordinary domestic electric forklift is generally low, explosion-proof design, on this basis can be sure there will be no good proof the whole performance, and explosion-proof modification will reduce the whole technical performance, so the design concept first reference to the new technology to improve the technical level of electric forklift trucks, but also innovative design ideas to design more in line with explosion-proof characteristics of the system (for example: Hefei move ETS Technology Development Co., Ltd. manufacture electric explosion-proof forklifts) do to low current, low temperature rise, low noise, high efficiency, the level of intelligent control of the whole.
b) Active Protection technology design and passive explosion-proof means of the combination.
General electric explosion-proof forklift design commonly used technique is to take a flameproof, intrinsically safe, increased safety type and other means to prevent the occurrence of explosion or explosion control in explosion-proof body, but also the simplicity of the circuit design to make reduce lines and reduce the spark control point, the aging, insulation performance by artificial periodic inspection, security risks.
So-called Active Protection technology with advanced sensor design of the whole circuit, short circuit protection, insulation monitoring and other electronic components and intelligent control system by combining the procedures set explosion-proof technical parameters, so that the whole explosion-proof performance automatic control to avoid the security risks caused by human activity. Liters of hot, hot drop and the second current-limiting control technology, can control the operation of the vehicle, to work longer hours.
c) a reasonable application of the explosion-proof technology to develop explosion-proof accessory products.
Electric explosion-proof forklift design, keep up with international advanced technology development, especially the developments in the field of electronic, hydraulic technology, such as: electronic monitoring products, hydraulic and wet brake are domestic technology is not a reasonable application the same time, with the domestic professional manufacturer for technical cooperation, development of key technology products to achieve localization, have jointly developed the technology to design and to master the core technology critical and supporting manufacturers in close technical collaboration, so that it does not appear to develop products because of the relatively low domestic manufacturers technology platform to meet the technical requirements.
2, the direction of development of the electric explosion-proof forklift
With the development of AC permanent magnet technology, electric explosion-proof forklift operation control system will be the development of AC permanent magnet in the direction of its brushless maintenance-free, avoid to remove carbon brush powder and replacement of carbon brushes and open compartment safety hazards caused by the blasting. Low speed can be achieved in the dynamic performance of the constant torque control, high-speed can be constant power control operation, high efficiency, energy recovery and with a variety of working conditions, anti-down function, so that the electric explosion-proof forklift with low current, low noise, the transmission efficiency high security, low temperature rise characteristics of the advantages.
Electric explosion-proof forklift trucks will use advanced electronic technology to continuously improve the level of protection of the machine it under the control of intelligent automatic protection, explosion-proof electronic components intelligence, integration and miniaturization.
Electric explosion-proof forklift on the overall design humane design thinking, to improve driver comfort, easy maneuverability, reduce the labor intensity of the driving staff, and rational distribution under the premise to ensure the machine tipping safety performance to achieve the beautiful effect.
Improve the standard of electric explosion-proof forklift technology, enterprise standards can not stay in the level of national standards, content merely to reach the national standard on the line, enterprises need to enhance manufacturing technology and product performance, the development of companies with high technical standards, to lead the national technical The standard upgrade, and eliminate backward enterprises, so that the integrity of the electric explosion-proof forklift manufacturing level to move forward.
At present, the development of the electric explosion-proof forklift by a variety of constraints, the relatively backward national standard is not perfect, did not identify the executive body of the standard assays, the market state is not enough supervision of the security of the operating units of explosion-proof environment caused some units do not have the explosion-proof forklift or buy to meet the inspection, all this restricts the development of electric explosion-proof forklift, I believe that with the national economic development, increasing the degree of safety supervision and safety law and constantly improve, coupled with on the manufacture of raising the level of electric explosion-proof forklift as a sunrise industry, will grow and develop out of the country competitive international market.