The industrial fast door refers to the quick opening and closing shutter door with the fastest moving speed of 2-2.5 m/s or more, or the automatic opening control of the quick opening and closing according to the height of the passing object. The addition of the sensor can solve the problem of low precision of the potentiometer commonly used in the conventional ordinary door opener.
The quick opening of the rolling door, especially the opening and closing according to the adjustable specified opening, greatly reduces the waiting time for the entrance and exit of the personnel or vehicles (such as forklifts, trucks, working equipment, etc.). The high-speed opening and closing of the quick door is extremely suitable for workshops and special areas with high dust-free environment control, which can effectively prevent the inflow of dust, insects and dirty air. At the same time, the use of fast doors in cold storage and factory drying rooms, factory environmental protection, etc. can reduce energy consumption and achieve energy saving and emission reduction benefits. Industrial fast doors have been popularized in developed industrial countries such as Europe, America and Japan for many years. Especially for production-oriented enterprises, there must be a fast door separation between the workshop and the workshop. If it is a food or pharmaceutical company, it is also mandatory by the government. It must be separated by a quick roll door to prevent secondary pollution. At present, fast-doors are required to be installed in industrial plants such as pharmaceuticals, food, semiconductors, cold storage and automobile plants. Driven by the country's new round of energy-saving emission reduction, the promotion and application of industrial fast-doors can also contribute to the energy-saving and emission reduction of factories and cold storage, and generate benefits for users.
The quick opening of the industrial quick door or the quick opening and closing of the specified adjustable opening requires such a variable frequency motor or servo motor control to achieve fast and accurate positioning control, but the cost of using the servo motor is high and fast. It is not necessary to use the door. At present, most of them are controlled by a simple PLC plus variable frequency motor.
In the control scheme of using PLC plus variable frequency motor, there are various ways to start the acceleration, deceleration, parking position and speed feedback, one is the semi-open loop control of the signal feedback of the position switch group such as the proximity switch, one is to increase The signal of the encoder is used for position closed-loop control of continuous position feedback, and the other is position closed-loop control of absolute position feedback with full-range absolute encoder.
In the past, the conventional potentiometers commonly used in ordinary door openers have low precision, which can not meet the requirements of fast and continuous multi-point acceleration and deceleration and parking control accuracy of fast doors. The following is a comparison of the various sensors:
1. With the feedback control principle of switches such as proximity switches, since only a single point position feedback is provided, the deceleration curve is calculated based on the inertial resistance of the field. When the inertial resistance characteristics of the field change, such as the resistance changes in spring, summer, autumn and winter, the system changes. The old and new resistance changes, the changes of various other factors on the scene, the fixed single-point feedback and control can not be changed, and can not achieve the consistent accurate deceleration and parking, sometimes miss the brake point and not stop in place, resulting in closing the door However, sometimes it is impossible to close the door. This method actually has a low cost in installing a plurality of switches or a self-made multi-switch integrated box, and brings inconvenience in maintenance. In addition, in the new promotion and development, the industrial fast door also needs to adjust the opening degree of the opening according to the height of the traffic. This control mode with the proximity switch cannot meet the control requirement of the adjustable opening. In fact, in the practice of fast door application manufacturers after many years, this method has been proved to be relatively backward, and it is not desirable to use this method.
2. Using the incremental encoder signal feedback to do the position closed loop feedback idea, according to this idea, we can know the continuous position of the fast door movement, and the effective controller adjusts the speed of the variable frequency motor to achieve the control requirement of quickly adjusting the acceleration, deceleration and parking. However, in actual use, the inverter interference signal inside the inverter is easy to interfere with the incremental pulse (the inverter has the principle of internal DC-AC inverter), and the sudden electromagnetic signal of the electromagnetic brake is for the incremental pulse. The interference, according to the incremental signal feedback parking, is found to be difficult to maintain consistency, the incremental encoder is often unable to obtain an accurate signal in the time lag of the motor blackout-brake, and the error has accumulated.
In addition, according to the foreign industrial fast door safety standard (mandatory regulations), the fast door needs to have the function of closing the door from the dual use for safety reasons. The incremental encoder is lost after the power failure manual switch door, and must rely on external signals. Re-determine the original point location.
According to the above problems, some manufacturers have to choose the approach of the proximity switch + incremental encoder, that is, the above two 1+2 feedback combination scheme, the switch signal compensates for the loss of the incremental encoder position. But in that case, the cost has increased greatly, and it has brought inconvenience in maintenance.
3. Continuous feedback of full-stroke absolute encoder position represented by GEX series full-stroke absolute encoder. The GEX encoder is an innovative full-stroke absolute multi-turn encoder with a non-contact absolute value disc inside, and not only in a 360-degree single-turn measurement, but also on internal clock-like gears. The principle measures multi-turn absolute value position information, full-stroke absolute value coding, when the power is off, it can move all the way and the position information is not lost. The GEX series encoders used in industrial fast doors generally use RS485 digital signal output, which can connect RS485 interfaces of all types of small PLCs, so that the user chooses the controller to have a low total cost, and the GEX series encoder itself is also domestically produced. The price promotion route, the price has been similar to the same level of incremental encoder, which is very popular with users. GEX full-stroke absolute value multi-turn encoder is generally installed on the speed reducer end, providing continuous absolute position feedback of full stroke. The controller relies on its full position information to quickly make the acceleration and deceleration of the variable frequency motor and stop the adjustment. Since this is internal The absolute value of the full stroke is encoded and transmitted by the RS485 digital signal. It has no effect on the above-mentioned inverter inverter interference, electromagnetic brake interference, power failure and manual movement, but always provides full-stroke absolute position feedback. The control commands that the controller can make can ensure complete consistency, thereby realizing fast, fast and accurate repeatability control requirements. In addition, for the newly promoted opening degree according to the requirements of the adjustable traffic, and the safety guarantee can be opened by the dual-purpose door. Because it is the full-stroke absolute value position signal, it is not affected by the power failure or interference. The opening degree is set at any height position, which fully meets the needs of future industrial development of industrial express doors. For this reason, the GEX full-stroke multi-turn absolute encoder is used, which makes it very convenient to debug in the field, which can greatly save the cost of on-site installation and commissioning, and the cost of future after-sales maintenance. The economical use is much better than the use of incremental encoders or Proximity to the switch group.
In addition, since the GEX encoder is a full-stroke absolute position signal, it can provide the continuous full-stroke position of the door opener under various conditions. After the power failure, the manual full-stroke closes the door or the power-off inertia slides down. The effect is that the safety of the use of the fast door control is ensured. In the application of the industrial fast door in foreign countries, the absolute value encoder is used to ensure that the door can be opened manually and automatically, which has become a mandatory safety regulation.
In the recent application of GEX38 encoder as an industrial fast door, its outstanding effect and economy have won the recognition of the door opener controller manufacturers and door opener factory users, such as the fast door bidding at a recent Shandong auto factory. In the case of the GEX38 encoder, the remaining solutions without absolute encoders, regardless of performance indicators, performance, or final price maintainability, cannot be compared with the GEX38 encoder solution, especially The industrial fast door has the function of automatically opening and closing the door, and the function of manually opening and closing the door after the power failure is required. The GEX encoder is a full-stroke absolute value multi-turn code, which can fully meet such requirements. According to this, it can be foreseen that it is safe, fast and adjustable, and can produce visible benefits for users. It is the development direction of industrial fast door. The fast door opener uses full-stroke absolute encoder (such as GEX series absolute multi-turn coding). ) has become a new benchmark in the industrial fast door opener industry.
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