4. Rack installation connecter
3. Bearing prevent: coopersleeve or nylon Sleeve
2. Rack and pinion: curved or directly rack, nylon or cooper sleeve for the pinion
1. Gear motor : 550W/750W
Choose the best location for your cool frame. In order to increase warmth and sunlight as well as your cold frame, pick an optimal area to put your structure. Choose a south-facing spot that offers lots of sunlight. Avoid spots near trees or various other structures where snow or leaves can put on your cold frame. This may result in harm to your structure or sunlight blockage.
Allow ventilation upon hotter days. Too much warmth isn’t always a very important thing – and that’s the benefit of a cold body greenhouse. Since outdoor sunlight and temperature influence a cold frame’s internal temperature, easily change your cold body during unseasonable heat waves. Of these occasions, open your structure and allow sufficient airflow to provide plants preferred warmth without suffocating them.
Use your cold frame for growing inside your means. As mentioned previously, cool frames are great for extending the developing season of cool-time of year vegetables in the springtime and winter. When hardening off tender vegetation and seedlings, cool frames also enable a less strenuous transition for plants from inside to outdoors. Stick to options that survive within your location’s current weather range, not totally out-of-season plant varieties. The internal temperatures are only somewhat warmer and more managed compared to the outdoors. So, plants should manage the highs and the lows of your region fairly well while guarded in your cool frame.
The rack and pinion drive system is for the mult-span agriculture venlo gear rack for Greenhouse greenhouse ventilation system, it can be used for the medial side window openingh or the roof widoiw opening system. The rack and pinion program move smoothly and reliable. and can be control automaticly.
Extend the season for cool-period crops. Because cool frames provide a slightly warmer and more controlled environment than external temps, these models help gardeners start plants without worry of frost or frozen floor. Plants won’t be suffering from 
unseasonably cold or hot weather we often experience during springtime and fall. Frosty frames work great for cool-season plants because they can withstand the low evening temperatures.
Overwinter dormant vegetation. While a cold body greenhouse won’t allow tender plants to keep growing through winter, these structures can protect them during dormancy. When overwintering plant life, minimize sunlight and maintain adequate soil moisture. This ensures plants won’t attempt to develop but don’t completely dry out either.
Harden off delicate plant life and seedlings. Cold framework greenhouses help vegetation make the changeover from indoor plant life to outdoor plant life. Whether you started seedlings in your house or a greenhouse, vegetation must gradually modify to the alter in temperature, sunlight, moisture, and exposure outdoors. With a cold body, plants are controllably subjected to these changes, while still remaining sufficiently secured. Once plants adjust to the climate alter in your cold framework, then transplant them to your garden.
Cold framework greenhouses are relatively simple to use for any or all of the reasons listed above. However, keep these couple of tips in mind in order to maximize the benefits of your structure.