In order to reduce and avoid the occurrence of parasite resistance to trichlorfon and improve the use of trichlorfon in a safe concentration range, the following measures can be taken:
(1) Rotational medication To prevent parasitic fish disease, do not use a drug of trichlorfon for a long time in order to cut off the formation of a pathogen resistant population.
(2) Combination therapy The combination therapy not only can simultaneously treat pests and diseases, increase drug efficacy, reduce costs, but also significantly overcome and inhibit the development of drug resistance. Such as: 90% crystal trichlorfon and ferrous sulfate mixture (0.5: 0.2) 0.25ppm to prevent the occurrence of 鲢 鳋 ; ; ; ;; 90% crystal trichlorfon and noodle mixture (1: 0.6) 0.25ppm can kill three generations Insects, ringworms.
(3) Enhancing the effectiveness of trichlorfon In order to enhance the efficacy of trichlorfon and reduce the resistance of parasites to it, in addition to strict control of symptomatic medication and careful use of drugs, rational compatibility synergist is also one of the ways to improve efficacy.
The rational application of trichlorfon in the fish disease prevention and control process how to use trichlorfon reasonably is a common concern in fishery production. The reasonable use of trichlorfon mainly pays attention to the following points:
(1) The use of trichlorfon to control parasitic fish disease should be adjusted according to the pathogen and the pH value of the water. The pH of the water can be slightly increased when the pH value of the water is 6.5-7. The pH is 8 -9 hours can reduce the amount of medication.
(2) In order to improve the prevention and treatment of fish diseases and reduce drug resistance, drugs should be used in rotation.
(3) When applying trichlorfon, do not add alkaline substances or wash with alkaline water to prevent the formation of more toxic methoxydichloroethylene phosphate to avoid poisoning of livestock and fish.
(4) The original drug of trichlorfon is acidic. When spraying, it is better not to use metal container to avoid corrosion. If metal sprayer is used, it must be washed with water in time.
Sectional Door Accessories: motor 220V-380V, control box, spring break device, cable break device , aluminum alloy rope pulley, enhanced shaft bracket, air bag system, duplex enhanced guide wheel bracket.
Detail introduction for above main accessories
1.Motor and controller:
The garage door operator is designed for residential overhead sectional and tilt doors.
The operator memorizes the limit positions and unique braking system that slows the unit down at the end of its travel.
Rolling code remote control with max. 20 pcs hand transmitters.
The operator is equipped with a manual release lever which allows manual operation of the door in case of power failure.
The controller has a security LOCK function which prevents operation of the door from transmitter.
2.spring break device:
Sectional doors are hinged and they bend in the tracks as the door opens and closes. Many of these doors are counterbalanced with extension springs, also designated "stretch springs," and they have seven characteristics. The length is the measurement of all the coils pressed together. This, along with the inside diameter of the coils and wire size - the thickness of the wire from which the springs are made - determine the stretch, the distance the spring is extended - normally half the door height, and pull, the force the spring pulls when stretched its normal length. The type of ends determine how the ends of the spring are mounted. The initial tension is the percentage of pull needed to separate the coils. This is determined by the pitch with which the springs are wound. On sectional garage door springs this is normally 15 percent. For example a 100 pound pull spring requires 15 pounds of weight to separate the coils; when a door is open the two springs will support 15 pounds of door weight without any stretch.
Most extension springs are made of oil tempered wire. These are normally coated or painted. Some springs are made of galvanized wire.
3.able break device:
cable break device ,door hardware
adjustable bottom bracket .
the raw material hot plate
zinc plated
safety device
adjustable bottom bracket
the raw material hot plate
zinc plating
spring safety device ,2" and 3" safety device
once the cable is broken ,this devoice can keep the hurt away from the door falling
4.aluminum alloy rope pulley
Equipment: CNC stamping/punching machine, CNC bending machine, CNC cutting
machine, 5~250 tons punching machines, welding machine, polish machines...
Processed material: stainless steel: copper, carbon steel
Surface treatment: Hot galvanized, polishing
Making process:Stamping, deep drawing,bending, punching, laser cutting,threading,
welding, tapping, riveting, grinding
5.air bag system
It is a safety device. When the door is down to hit something, it will up automatically.
Operation pressure:<3mbar
Battery:CR2032*2
Battery lifetime>1 year
Emission frequency: 315MHZ
Emission power:<10mW
Receiver power source:12V
6.duplex enhanced guide wheel bracket
Determining the right type of sectional door roller for your garage door tracks can be a little confusing, especially when you do not know what you need to look for in a garage door roller. To simplify things, there are two primary things you need to be aware of. First are the actual dimensions of the roller, and second is purpose that you will be using the door for. You can read below about measuring your roller and choosing the right quality of material for your door.
Other Door Accessories,Electronic Door Accessories,Automatic Door Accessories,High Speed Door Radar Detector
Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.hongfadoor.com