As a chenlong hardware with 20 years of experience in greenhouse opener production, we specialize in the development and manufacture of single-spring and double-spring automatic greenhouse openers, and understand the core significance of ventilation for greenhouse cultivation. Whether it is a small greenhouse for home gardening enthusiasts or a commercial greenhouse for large-scale production, the precise control of temperature and humidity directly determines the growth status and final yield of crops. The cumbersome and lagging manual ventilation has long been unable to meet the needs of modern greenhouses for efficient and precise planting, and the automatic window opener, as the core equipment of intelligent ventilation, has become the preferred choice of more and more growers by virtue of its simplicity, reliability, energy-saving and high efficiency advantages.
Why is reasonable greenhouse ventilation vital?
Ventilation is the core of greenhouse environment regulation, reasonable ventilation can regulate the temperature, humidity, air quality in the greenhouse, create suitable growing conditions for crops, reduce the occurrence of pests and diseases, and improve crop yield and quality. Specifically, it is mainly reflected in the following three aspects:
Greenhouse “heat gathering effect” in winter can help keep warm, but in the spring and summer, especially at noon on a sunny day, will lead to a sharp rise in indoor temperature, the formation of the “greenhouse effect” overload.
High humidity environment in the greenhouse, is mold, mildew, fungal diseases (such as mildew, gray mold, powdery mildew) breeding “hotbed”. Crop growth process will be transpiration, the release of large amounts of water, and closed greenhouse water can not be distributed in a timely manner, will lead to the indoor relative humidity is maintained at more than 80% for a long period of time, especially at night, the temperature drops, the humidity will be further increased to more than 90%, at this time, pests and diseases are very easy to break out.
high humidity triggered by pests and diseases: mold, mildew will adhere to crop leaves, fruit surface, the formation of white, gray mold layer, impede crop respiration and photosynthesis, will lead to leaf rot, fruit deterioration; fungal diseases will invade the crop through the leaf stomata, resulting in crop growth is impeded, or even death. According to statistics, more than 80% of the diseases in the greenhouse are related to high humidity, once the outbreak, not only will affect the current yield, but also may be residual germs, affecting the subsequent planting.
Ventilation of airflow regulation: reasonable ventilation can promote air convection inside and outside the greenhouse, timely discharge of excess water vapor indoors, the relative humidity control in the appropriate range of 60% -70%, destroying the breeding environment of pests and diseases.
At the same time, the air flow can take away the water vapor on the surface of the crop leaves, reduce the adhesion of pathogens, but also provide sufficient oxygen for the crop to promote root respiration and nutrient absorption, and enhance the crop’s resilience. In our production process, through the testing of different greenhouse scenarios, we found that after installing the automatic window opener, the relative humidity in the greenhouse can be stably controlled in the appropriate range, and the incidence of pests and diseases can be reduced by more than 60%.
Natural ventilation is the most energy-efficient and environmentally friendly way of greenhouse ventilation, while roof windows are the core component of natural ventilation. Compared with the side windows, the roof windows have unique advantages: the hot air density is small, it will rise naturally and be discharged from the roof windows, and at the same time, it will introduce the outdoor cold air, forming thermal pressure ventilation, which is more efficient and uniform; in addition, the roof windows will not occupy the greenhouse interior space when they are opened, so they do not affect the crop planting and field operations, and they can avoid the rainwater infiltration and cold wind blowing directly on the crops, which may occur when the side windows are opened. Problems.
For most greenhouses, the opening angle of the roof window directly affects the ventilation effect – the larger the opening angle, the larger the ventilation, the more obvious the effect of cooling and humidity reduction. The automatic window opener can accurately control the opening angle of the roof window, automatically adjusted according to the temperature change in the greenhouse, to realize the precise control of ventilation, not only to ensure the ventilation effect, but also to avoid too large a window caused by the temperature is too low, the crop is frozen and other problems. Our single-spring and double-spring automatic window openers can support 0-90° angle adjustment, adapt to different types of roof windows, and meet the ventilation needs of all types of greenhouses.
Temperature-sensitive expansion technology, is the use of temperature-sensitive materials (such as paraffin) thermal expansion and contraction characteristics, the temperature change into mechanical power, without external energy. Our single-spring and double-spring automatic window openers are made of imported high-quality temperature-sensitive paraffin wax, which has a stable coefficient of thermal expansion and contraction and a high degree of sensitivity, and is capable of accurately sensing temperature changes in the greenhouse.
Specifically, the paraffin wax filled in the heat-sensitive cylinder is in solid or semi-solid state at room temperature, at this time the cylinder piston is in the contraction state, the window stays closed; when the temperature inside the greenhouse rises and reaches the preset opening temperature, the paraffin wax expands by heat and becomes larger, pushing the cylinder piston outward, and then drives the window to rotate around the hinge through the lever arm transmission, realizing the window opening; when the temperature inside the greenhouse drops and is lower than the preset closing temperature, the paraffin wax expands and becomes larger, pushing the cylinder piston outward, and then the window rotates around the hinge through the lever arm transmission, realizing the window opening; when the temperature inside the greenhouse drops and is lower than the preset closing temperature, the window opens. preset closing temperature, the paraffin wax cools and shrinks, becoming smaller in size, and the piston resets under the tension of the spring (single/double spring), driving the window to close, completing a complete automatic cycle.
It is worth noting that our dual-spring window opener is designed with double springs, which has a more even spring tension compared to single-spring products, and can better balance the thrust of the cylinders, avoiding jams and wobbles when the window opens and closes, and is especially suitable for windows with a higher weight (e.g. glass roof windows). This temperature-sensitive expansion technology has a fast response time and temperature sensing accuracy of up to ±1℃, which can respond to temperature changes in the greenhouse in a timely manner to avoid temperature overshooting.
Different crops grow at different temperatures, so the temperature adjustment function of the automatic window opener is crucial. Our single-spring and double-spring automatic window openers are equipped with precise temperature adjustment mechanism, which is easy to operate and suitable for all kinds of crops.
The core of temperature regulation is to adjust the trigger threshold of the thermal cylinder, the specific operation is: by rotating the temperature adjustment knob, change the size of the sealing space of the paraffin wax in the cylinder, so as to change the temperature required for paraffin wax expansion and contraction. For example, for tomatoes, cucumbers and other temperature-loving crops, the opening temperature can be set to 28 ° C – 30 ° C, the closing temperature is set to 20 ° C – 22 ° C; for lettuce, spinach and other leafy crops, the opening temperature can be set to 25 ° C – 27 ° C, the closing temperature is set to 18 ° C – 20 ° C; for the nursery greenhouse, the temperature requirements are higher, you can open the temperature is set to 30 ° C, the closing temperature is set to 22 ° C, to ensure that the seedling growth requirements. For seedling greenhouses with higher temperature requirements, the opening temperature can be set to 30°C and the closing temperature to 22°C to ensure a stable temperature environment for seedling growth.
In addition, our double-spring window opener also supports the opening angle adjustment, which can be adjusted by adjusting the length of the lever arm to control the maximum opening angle of the window, and flexibly adjusted according to the demand for ventilation – when the demand for ventilation is large, the opening angle is adjusted large; when the demand for ventilation is small, the opening angle is adjusted small, to avoid over-ventilation resulting in too low a temperature.
Temperature regulation: The window opener starts to open at 59 – 77°F and fully opens at 86 – 90°F, helping to maintain the right temperature inside the greenhouse.
Promotes Plant Growth: By regulating temperature and ventilation, these window openers improve the growing environment for plants, which increases vegetable production and reduces damage caused by pests.
Easy to use: These openers do not require a power supply and can be easily installed on existing greenhouse windows. They are self-adjusting and require no human intervention.
Windproof: Windproof window openers are specially designed to keep large windows in place during strong winds, thanks to sturdy springs and shock absorbers.
The service life of greenhouse window openers not only depends on the quality of the product, but also closely related to the daily maintenance. Combined with our 20 years of production experience, good routine maintenance can extend the service life of the window opener (can be extended for 2-3 years), reduce the occurrence of failures, and reduce maintenance costs. The following are maintenance tips for single-spring and double-spring automatic window openers, which are simple and easy to operate, and suitable for growers to implement on a daily basis:
Different seasons, different greenhouse environments, different maintenance priorities, it is recommended to perform maintenance according to the season, the specific list is as follows:
Spring (March-May): Spring temperatures rise, greenhouse ventilation needs increase, window opener operation frequency increases. Maintenance focus: check whether the bracket connection is firm, whether the lever arm is loose; clean the dust and debris on the surface of the thermal cylinder to ensure that the temperature sensing is sensitive; check the spring tension, if the spring is slack, adjust it in time.
Summer (June-August): high temperature and high humidity in summer is the peak period of operation of the window opener, and also a high incidence of failure. Maintenance focus: clean all parts of the window opener once a week to avoid accumulation of dust and water vapor; check whether the seals are intact, if aging, broken, timely replacement; check the lubrication of the lever arm, if the operation is stuck, add lubricant in time.
Autumn (September-November): The temperature drops in the fall, the ventilation demand decreases, and the window opener operates less frequently. Maintenance focus: check whether the window is closed tightly, if there is a gap, adjust the length of the lever arm; clean all parts of the window opener, remove dust and stains on the surface; check the operation of the thermal cylinder to ensure that the temperature sensing is normal.
Winter (December-February): The temperature is lower in winter, the window opener operates less frequently, and paraffin solidification may occur in some areas. Maintenance focus: check whether the window opener can open and close normally, if it is stuck, heat the thermal cylinder properly to help the paraffin melt; before closing the greenhouse, check whether the window is closed tightly to avoid the entry of cold air; if it is not in use for a long period of time, dismantle the window opener and store it properly to avoid freezing damage.
Cleaning and lubrication is the core of daily maintenance, which can avoid wear and tear of parts and ensure smooth operation:
Cleaning: Clean all parts of the window opener (thermal cylinder, lever arm, bracket) with a dry cloth every week to remove dust, debris and water vapor from the surface; if there is any stain, use a wet cloth to gently wipe it off, and dry it with a dry cloth after wiping it off, to avoid water vapor residue and prevent rusting. Prohibit the use of corrosive cleaning agents (such as hydrochloric acid, sulfuric acid) to avoid damage to parts.
Lubrication: Every 1-2 months, add a small amount of lubricant (Vaseline or special lubricant is recommended) to the connection of the lever arm and the cylinder piston to reduce the friction between parts and ensure smooth operation. When adding lubricating oil, it is necessary to add the right amount to avoid too much to cause dust and debris sticking and affecting the operation.
Thermal cylinder is the core component of the automatic window opener, the service life can be up to 8-10 years, but if the following situations occur, it means that the thermal cylinder has been damaged and needs to be replaced in time to avoid affecting the ventilation effect:
Temperature sensing is not sensitive: when the temperature in the greenhouse reaches the preset opening temperature, the window opener cannot be opened in time; or when the temperature drops to the closing temperature, it cannot be closed in time, and there is no improvement after repeated tests.
Paraffin leakage: Observe the surface of the thermal cylinder, if there are oil stains or stains, it means that the paraffin is leaking and the cylinder is damaged and cannot provide power normally.
Piston cannot move normally: Push the lever arm and find that the piston cannot extend or reset smoothly, or it is stuck or loose, indicating that the internal parts of the cylinder are damaged.
Expiration of service life: If the window opener has been used for 8-10 years, even if there is no obvious failure, it is recommended to replace the thermal cylinder to avoid failure due to aging parts, which will affect the ventilation of the greenhouse.
When replacing the thermal cylinder, it is recommended to choose the original parts to ensure that it matches the window opener, and follow the installation guide when installing to ensure a firm connection and smooth operation.
(1) The weight of the window exceeds the carrying capacity of the window opener, resulting in insufficient cylinder thrust;
(2) The length of the lever arm is not adjusted properly, which cannot drive the window to open completely;
(3) The bracket connection is loose, resulting in uneven force;
(4) The thermal cylinder is aging, resulting in a decrease in thrust.
(1) Check the weight of the window, if it exceeds the window opener carrying capacity, replace the window opener with a larger carrying capacity (such as a single spring for a double spring);
(2) Adjust the length of the lever arm, extend the lever arm, increase the opening force to ensure that the window can be fully opened;
(3) Check the bracket connection, tighten the loose bolts and screws to ensure that the bracket is firmly fixed;
(4) If the thermal cylinder is aging, replace the original thermal cylinder.
(1) Dust and debris on the surface of the thermal cylinder, affecting temperature sensing;
(2) Lack of lubrication at the lever arm joint, high friction resistance;
(3) Improper setting of the temperature adjustment knob, the opening temperature is too high;
(4) The ambient temperature changes too slowly, resulting in slow expansion and contraction of paraffin wax.
(1) Clean the dust and debris on the surface of the thermal cylinder to ensure sensitive temperature sensing;
(2) Add lubricant to the lever arm joint to reduce friction resistance;
(3) Adjust the temperature adjustment knob to reduce the opening temperature to ensure timely opening;
(4) If the ambient temperature change is too slow, increase the greenhouse vent appropriately to promote air convection and accelerate the temperature change.
(1) The temperature adjustment knob is set incorrectly;
(2) Thermal cylinder aging, temperature sensing accuracy decreases;
(3) Improper installation position of the thermal cylinder, close to the heat source (e.g., heating equipment) or cold source (e.g., vents), resulting in inaccurate temperature sensing;
(4) Uneven temperature distribution in the greenhouse, the temperature of the location of the window opener and the temperature difference between the crop growth area is large.
(1) Re-adjust the temperature adjustment knob to set the correct opening and closing temperatures according to crop demand;
(2) If the thermal cylinder is aging, replace the original thermal cylinder;
(3) Adjust the installation position of the thermal cylinder away from heat and cold sources to ensure that the sensed temperature is the average temperature in the greenhouse;
(4) Arrange the vents evenly in the greenhouse to promote air convection and ensure even temperature distribution.
For most greenhouse growing scenarios, it can bring significant convenience and benefits. Based on our 20 years of experience in the industry, the following types of growers and scenarios are best suited for the use of automatic window openers, especially single and double spring non-electric products:
Home garden greenhouse growers: Most of these growers are gardening enthusiasts who don’t have much time to guard their greenhouses and manual ventilation is cumbersome. Automatic window openers do not require manual operation, and can easily ventilate greenhouses, saving time and energy, and are suitable for growing vegetables, flowers and potted plants.
Commercial vegetable production base: Whether small and medium-sized or large-scale vegetable planting base, need accurate ventilation control to ensure crop yield and quality, automatic window opener can achieve unattended precision temperature control, significantly reduce labor costs, improve planting efficiency, especially for tomatoes, cucumbers, peppers and other fruit and vegetable large-scale planting.
Seedling nursery base: seedling growth is extremely sensitive to changes in temperature and humidity, slight environmental fluctuations may lead to a decline in the survival rate of seedlings, automatic window opener can create a stable and suitable growth environment for seedlings, improve seedling survival rate, laying the foundation for subsequent planting.
Scientific research experiment greenhouse: scientific research greenhouse needs precise and stable environmental parameters to ensure the accuracy of the experimental data, the automatic window opener can realize the fine control of temperature and humidity, avoid the environmental fluctuations caused by manual operation, and meet the strict requirements of scientific research experiments.
Flower planting greenhouse: flowers have higher requirements on the growing environment, suitable temperature and humidity can enhance the flower shape, color and flowering period of flowers, and the precise ventilation control by the automatic window opener can effectively reduce the occurrence of pests and diseases of flowers and enhance the commodity value of flowers, which is suitable for the planting of high-end flowers such as roses, lilies and phalaenopsis orchids.
As a professional manufacturer with 20 years of experience in metal stamping and precision machining, chenlong Hardware is deeply engaged in the R&D and production of greenhouse automatic window openers. Its single-spring and double-spring greenhouse automatic window openers rely on advanced 100T-300T stamping equipments, precision CNC machining process and strict quality control of the whole process to realize the product characteristics of high load-bearing, corrosion-resistant and long service life, which are suitable for all kinds of greenhouse structures, such as aluminum, PC board and glass, and are suitable for all kinds of greenhouse structures, such as aluminum, PC board and glass. The products are suitable for aluminum alloy, PC board, glass and other types of greenhouse structure, to meet the needs of home gardening, commercial planting, seedling research and other scenarios. We can provide one-stop solutions from customized mold design, sample proofing to large-scale production, with an annual production capacity of 15,000 tons, and our products are exported to North America, Europe and other parts of the world, trusted by more than 1,000 customers. If you have greenhouse automatic window opener purchasing, customization needs, feel free to visit customers-hardware for details, or contact us directly for exclusive solutions, chenlong hardware will be your greenhouse planting quality partner with exquisite craftsmanship, reliable quality, efficient service.
