The drying equipment is based on the atomization system, and the induced draft fan and the blower are a molding device for transporting energy tools. The liquid is transported to the atomizer through the transfer pump (the atomizer of the centrifugal spray dryer is a high-speed motor that squirts the liquid into a mist by the action of centrifugal force, and the pressure spray dryer turns the liquid into small droplets by a high-pressure pump. Then the misty droplets encounter hot air into powder or small particles, and the powder or small particles have good fluidity and solubility; at the same time, it is convenient for packaging and convenient for transportation. In recent years, the development of spray drying equipment has been rapid, the key lies in the extensive application of the products it produces, and secondly, there is a related use of frequency converters that have power saving and smooth motor speed regulation.
The application principle of the frequency converter in the drying equipment Generally, the type of the inverter used (fan type, pump type, etc.) is selected according to the nature of the material to be sprayed (fluidity, viscosity, specific gravity, etc.), and the power is selected according to the power of the motor. The capacity of the inverter. Then set or change the frequency of the motor, sometimes you can use temperature, flow, negative pressure (since the drying equipment is a closed environment, when the induced draft fan works, negative pressure will be generated in the drying tower) or pressure signal to achieve the frequency The automatic control, in turn, changes the speed of the motor. It can be said that in the system of drying equipment, the core components use the inverter. The purpose of the inverter for the induced draft fan and the blower is to maintain the uniformity of the heat of the system and the full utilization of the thermal energy and the stability of the system. On the other hand, it saves energy. The frequency converter for the transfer pump is capable of regularly and quantitatively conveying the liquid, and controls the amount of feed as the temperature changes. The inverter can be equipped with a frequency converter to increase the rotation speed, so that the material can be evenly distributed, and a uniform granular or powdery product can be obtained.
Selection and commissioning of the inverter (1) Select the inverter Firstly, select the phase number (single phase or three phase) and voltage of the inverter according to the motor; select the capacity of the inverter according to the power of the motor to be controlled, the capacity of the inverter It is greater than or equal to the power of the controlled motor; the output current of the inverter is selected according to the current of the motor, and the currents of the two are the same; the highest frequency, the lowest frequency, the basic frequency and the frequency of the inverter are selected according to the rated speed and frequency of the motor. Turning frequency; in special cases, higher requirements are required for the inverter, such as the environment used, the temperature and humidity of the periphery, and so on.
(2) The selection and setting of the parameters of the inverter is the prerequisite for ensuring the normal operation of the load. For example, the inverter needs different time according to the moment of inertia of the load, and the time required to start and stop the motor is different. If the set time is too short, the inverter will overcurrent during acceleration and overvoltage protection during deceleration; If the time is too long, the inverter will make the system adjust slowly during the speed regulation operation, the reaction will be delayed, and the reaction ability will be poor. For a long time, the motor will not reach the desired speed, and the system is easy to be in a short-term unstable state. In short, the length of start and stop depends on the speed of the motor and the size of the load.
The problems that the inverter should pay attention to when controlling the motor operation (1) In the system of the inverter controlling the high-speed motor, the motor is a special inverter motor, and the ordinary motor is not available. At the same time, the vibration and noise of the motor must be considered. It is also necessary to confirm the range of speed of use of the motor bearings and mechanical devices. The inverter may encounter the mechanical resonance point of the load device within a certain output frequency range, and the jump frequency must be set to avoid the resonance point.
(2) In this system, the power cable and the motor cable must not be connected incorrectly during wiring. Otherwise, the inverter will be damaged. Before the motor is used for the first time or after being used for a long time, it should be checked for motor insulation to prevent damage to the inverter due to insulation failure of the motor winding. When testing with a 1000v voltage type megohmmeter, it should be ensured that the measured insulation resistance is greater than or equal to 5 megohms.
(3) When the inverter is working, there is high voltage inside, in order to ensure the safety of people and equipment. The inverter must be grounded reliably and must not be grounded together with other high-powered equipment. The shorter the grounding wire, the better.
(4) For the motor that controls the atomizer, the order of loading should be correct. The inverter must be started to let the motor reach the required speed, and then the material is added to the atomizer, otherwise the inverter will have overload protection. When stopping, stop feeding, then stop the motor, and finally turn off the inverter power.
(5) If it is necessary to install a switching device such as a contactor between the output side of the inverter and the motor, make sure that the inverter is turned on and off when there is no output, otherwise the inverter may be damaged.
(6) Repair the inverter. After the power is turned off for 10 minutes, the charging indicator light is completely extinguished or the positive and negative bus voltages are below 36v, otherwise there is danger of electric shock. The wiring work must be carried out with the input power supply completely disconnected; after the wiring is completed, the cover must be closed before power can be applied; after power-on, except for the operation panel of the keyboard, it is forbidden to touch the inverter (including accessories). Part.
Advantages of using a frequency converter to control a motor (1) Low cost The mechanical atomizer used on a drying device has a complicated structure and high cost. It usually consists of at least two motors (spindle motor and oil pump motor, and two oil pump motors are used for high power), so its price is much higher than the price of one inverter and one high speed motor.
(2) Low energy consumption For the atomizer system that atomizes the same amount every hour, the mechanical atomizer has a large motor and a large number of electric motors, thus consuming too much electric energy; . The use of the inverter to control can change the motor speed according to the change of the load, of course, will reduce the power consumption. For example, the fan-type load inverter can control energy saving by 20% to 30%.
(3) Low failure rate As long as the inverter manual is read and the inverter is operated correctly, there are usually few problems. Even if the fault occurs, it can be displayed through the fault display of the inverter.
(4) Simple operation In the drying equipment system without the inverter control, if the negative pressure of the system (ie the air volume of the induced draft fan) is to be changed, the butterfly valve at the front end of the induced draft fan must be adjusted, and the inverter should only change the set value. Will achieve the goal. This will not only reduce the labor intensity of the operator, but also improve the stability and sensitivity of the system.
(5) Low noise The inverter is used to control the fan and pump load to greatly reduce noise.
Nylon webbing belt ratchet tie down strap is used for tying down loads while transporting, shifting or moving them.
Ratchet Tie Down
Description
1. Color: Blue, yellow, orange or requirement
2. B.S: 800kg-10000KG
3. Strap Material: Polyester, nylon, Polypropylene, Poly-amide, PP, PE...
4. Width: 25MM - 100MM
5. Length: 25ft,27ft,30ft,6m,8m,8.2m,9m,10m,or customize length
6. Hook: with relative double j hook (or claw hook or flat hook) or customize
7. Certificate: TUV, GS, ISO 9001, according to EN12195-2
8. Remark: OEM orders are acceptable
9. Packing: Carton, Pallet for 800KG-10T plastic handle cargo ratchet strap.
10.Place of origin: Zhejiang, China (Mainland)
11.Production lead time: Within 25 days after order of 800KG-10T plastic handle cargo ratchet strap confirmed.
12.Notice: Polyester webbing is unaffected by water, oils, grease and most chemicals, although contact with strong alkali should be avoided.
Used for restraint of cargo on truck or trailer in transportation.
A wide variety of standard and heavy-duty fittings are available.
Caution: cargo lashings must NOT be used for lifting.
The main advantages of ratchet lashings are:
1. Custom logo or design.
2. Load restraint using a tensioning device (ratchet)
3. Effective and safe control of loads whilst transportation
4. Extremely quick and efficient tie down and release of load thus saving time.
5. No damage to the load being tied down.
Specifications:
|
size of Ratchet Tie Down |
25MM-100MM |
|
breaking strength of Ratchet Tie Down |
800KG-10000KG |
|
Length of Ratchet Tie Down |
4M to15M |
Products show
WARNING:
1.The slings should avoid the harm of the sharp instrument when lifting the goods.
2.Don't put something on the ratchet to avoid the danger.
3.Never use slings with damages or defects.
4.Forbidden to tie a knot of the sling or link with a knot. You should link the sling with the right connecting piece.
5.Only use slings with clear identifications.
6.Before use,check working load limit, length and working position.
7. Don't use the ratchet strap for lifting.
Ratchet Tie Down
Ratchet Tie Down,Ratchet Belt Tie Down,Ratchet Tie Down Straps,Ratchet Straps
Hebei Liston Lifting Rigging Manufacturing Co., Ltd. , https://www.liftingriggingfactory.com