Greenhouse ventilation control mechanism

Abstract

The invention provides a greenhouse ventilation control mechanism. The greenhouse ventilation control mechanism comprises a motor, wherein each of two sides of an output shaft of the motor is in power connection with a main power belt; two end parts at the same sides of the two main power belts are directly connected and wound on two rotary wheels to form an annular rotary power belt; or two end parts at the same sides of the two main power belts are connected through one main traction rope; after the two main traction ropes are wound on the two rotary wheels, the two main traction ropes and the two main power belts together form an annular rotary power belt; two side parts of the rotary power belt are connected with a plurality of groups of traction units for driving a ventilation curtain. The greenhouse ventilation control mechanism has the advantages of simple structure, convenience in operation, balanced stress, stable whole structure and long service life.

Description

technical field [0001] The invention belongs to the field of automatic control of greenhouse ventilation, and in particular relates to a greenhouse ventilation control mechanism. Background technique [0002] The air vents provided on the roof of the greenhouse can ventilate the greenhouse by regularly opening and closing the air vents, thereby effectively adjusting the temperature and humidity in the greenhouse. The air outlet is generally covered with a film ventilation curtain, and the bottom edge of the film ventilation curtain is connected with a stay rope, and the bottom edge of the ventilation curtain is driven to rise and fall by pulling the stay rope, thereby controlling the opening and closing of the air outlet. Manually pulling the rope is labor-intensive and time-consuming. At present, a motor-driven venting mechanism is often used to automatically pull the rope. [0003] Existing ventilation control mechanisms all have the same problem, that is, the problem of ...

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Problems solved by technology

[0007] Although the above air release control mechanism puts the chain on the output shaft of the motor instead of the aforementioned "bypass" method, it analyzes the force relationship of the mechanism in detail. When the chain drives several branch ropes to move in a certain direction, All the reverse pulling force exerted by the branch rope on the chain is still fully borne by the output shaft of the motor. Therefore, this mechanism does not reduce the lateral pulling force on the output shaft of the motor at all, and it will still cause the output shaft of the motor to eccentric

[0008] In addition to the aforementioned two air release control mechanisms, the same or similar air release control mechanisms are also disclosed in the patents with the patent numbers "201520106739.0" and "201220666602.7", which also have the problems of excessive lateral tension and unbalanced force on the power mechanism.

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