Vegetable seedling cultivation greenhouse ventilation device

Abstract

The invention relates to the technical field of vegetable seedling planting greenhouses, and discloses a vegetable seedling planting greenhouse ventilation device which comprises a greenhouse, a plurality of first ventilation openings are formed in the two sides of the greenhouse, a ventilation tower is arranged at the top of the greenhouse, a second ventilation opening is formed in the top of the ventilation tower, and a first rotating rod is rotationally arranged on the ventilation tower; an exhaust fan is arranged on the first rotating rod; the ventilation tower is further provided with a temperature control driving assembly, the temperature control driving assembly drives the exhaust fan to rotate according to the temperature in the greenhouse so as to form negative pressure at the second ventilation openings to pump air in the greenhouse out of the greenhouse, and external air is introduced into the greenhouse through the first ventilation openings for ventilation. According to the ventilation device for the vegetable seedling planting greenhouse, the ventilation tower is triggered to operate according to temperature rise in the vegetable seedling planting greenhouse to accelerate ventilation between the greenhouse and the outside, airflow is used as driving force after operation is triggered, no extra drive needs to be installed, and energy consumption and cost are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of vegetable seedling raising and planting greenhouses, and in particular to a ventilation device for vegetable seedling raising and planting greenhouses. Background Art

[0002] Vegetable seedling planting greenhouse is an important production facility for modern agricultural planting. The composition of the greenhouse is a frame made of bamboo poles, cement poles, light steel pipes or pipes and other materials, which are made into columns, pull rods, arch rods and pressure rods, and covered with plastic film to form an arched material shed.

[0003] Greenhouses provide a relatively suitable growth environment for vegetables, but ventilation management is also a key link to achieve high quality and high yield. Ventilation in greenhouses is mainly to remove moisture from the greenhouse and introduce fresh air. Such natural ventilation can also adapt well to the requirements of the planting environment.

[0004] Usually, greenhouse ventilation includes natural ventilation and mechanical ventilation. Natural ventilation is one of the common methods of ventilation in greenhouses. Natural ventilation can be achieved by adding skylights, openings, or opening a door on the front and back of the greenhouse during greenhouse design. However, the ventilation speed of natural ventilation is limited and is subject to external environmental factors. Mechanical ventilation uses fans, ventilation ducts and other equipment to draw outdoor air into the greenhouse and expel indoor heat and harmful gases, thereby achieving ventilation effects. Mechanical ventilation is suitable for greenhouses with large scale, poor airflow or small building space. However, the installation of mechanical ventilation equipment will also consume extra energy and increase costs, and the equipment needs to be maintained and has a certain failure rate, which will also cause inconvenience to production.

[0005] Therefore, in order to solve the above-mentioned technical problems existing in the prior art, a ventilation device for a vegetable seedling cultivation greenhouse is proposed. Summary of the invention

[0006] The present invention provides a ventilation device for a vegetable seedling raising and planting greenhouse. The device has the function of triggering the operation of a ventilation tower according to the increase in temperature in the vegetable seedling raising and planting greenhouse to accelerate the ventilation between the greenhouse and the outside world. After the trigger operation, the airflow itself is used as a driving force without the need for additional installation of a driver, thereby reducing energy consumption and costs. This solves the problem that the ventilation speed of natural ventilation in the prior art mentioned in the above background technology is limited and is subject to external environmental factors, and the installation of mechanical ventilation equipment will also consume additional energy and increase costs. The equipment needs to be maintained and has a certain failure rate, which will also cause inconvenience to production.

[0007] The present invention provides the following technical solution: a ventilation device for a vegetable seedling cultivation greenhouse, comprising a greenhouse, a plurality of first vents are provided on both sides of the greenhouse, a ventilation tower is provided on the top of the greenhouse, a second vent is provided on the top of the ventilation tower, a first rotating rod is rotatably provided on the ventilation tower, and an exhaust fan is provided on the first rotating rod;

[0008] The ventilation tower is also provided with a temperature control driving component, which drives the exhaust fan to rotate according to the temperature in the greenhouse to form a negative pressure at the second vent to draw the air in the greenhouse out of the greenhouse, and introduces outside air into the greenhouse through a number of the first vents for ventilation.

[0009] As an optional solution of the ventilation device for a vegetable seedling cultivation greenhouse of the present invention, the temperature control drive assembly includes a second rotating rod rotatably arranged in the ventilation tower, the second rotating rod is provided with an air induction plate and a first torsion spring, and the two ends of the first torsion spring are respectively connected to the second rotating rod and the inner wall of the ventilation tower;

[0010] The ventilation tower also includes a transmission assembly and a force storage assembly. The force storage assembly accumulates the elastic potential energy of the first torsion spring, and releases the elastic potential energy of the first torsion spring to drive the second rotating rod to rotate. The transmission between the second rotating rod and the first rotating rod is achieved through the transmission assembly.

[0011] As an optional solution of the ventilation device for a vegetable seedling planting greenhouse described in the present invention, the transmission assembly includes a third rotating rod rotatably arranged in the ventilation tower, the third rotating rod is provided with a first bevel gear, the first rotating rod is provided with a second bevel gear, and the second bevel gear is meshed with the first bevel gear.

[0012] As an optional solution of the ventilation device for a vegetable seedling cultivation greenhouse described in the present invention, the transmission assembly also includes a rotating tooth arranged on the third rotating rod, and a first rotating drum is rotatably arranged in the greenhouse, and a plurality of shifting teeth matched with the rotating tooth are arranged on the first rotating drum.

[0013] As an optional solution of the ventilation device for a vegetable seedling greenhouse described in the present invention, the transmission assembly also includes a ratchet arranged on the second rotating rod, a pawl is rotatably arranged in the first rotating cylinder, and the pawl is engaged with the ratchet, and a spring sheet is arranged in the first rotating cylinder to press the pawl tightly against the surface of the ratchet.

[0014] As an optional solution of the ventilation device for a vegetable seedling planting greenhouse described in the present invention, the power storage component includes a fixed cylinder arranged on the second rotating rod, a card slot is opened on the fixed cylinder, a fourth rotating rod is rotatably arranged in the greenhouse, a card block is arranged on the fourth rotating rod, and the card block is movably connected in the card slot.

[0015] As an optional solution of the ventilation device for a vegetable seedling greenhouse described in the present invention, the power storage component also includes a bimetallic plate arranged in the ventilation tower, the bimetallic plate is composed of two metal plates with unequal thermal expansion coefficients, and a fifth rotating rod is rotatably arranged on the clamping block.

[0016] As an optional solution of the ventilation device for vegetable seedling cultivation greenhouse of the present invention, wherein: a push plate is provided on the fifth rotating rod, and the push plate is located in the bending direction of the bimetallic plate;

[0017] The force storage assembly also includes a second torsion spring and a motor. Two ends of the second torsion spring are respectively connected to the fifth rotating rod and the clamping block. The output shaft of the motor is connected to the fifth rotating rod.

[0018] As an optional scheme of the ventilation device for a vegetable seedling planting greenhouse described in the present invention, the ventilation tower also includes a vibration component, the vibration component includes a second rotating cylinder rotatably set on the second rotating rod, the second rotating rod is provided with a third torsion spring, and the two ends of the third torsion spring are respectively connected to the second rotating rod and the inner wall of the second rotating cylinder.

[0019] As an optional solution of the ventilation device for a vegetable seedling greenhouse described in the present invention, a pull rope is wound around the second rotating drum, and matching paddles and vibrating plates are provided in the ventilation tower, and the two ends of the pull rope are respectively connected to the second rotating drum and the paddle.

[0020] The present invention has the following beneficial effects:

[0021] 1. The ventilation device for vegetable seedlings and greenhouses uses the rotation of the exhaust fan installed on the top wall of the greenhouse to generate negative pressure at the vents, continuously extracting the air in the greenhouse, accelerating the air intake at the vents on the side of the greenhouse, thereby accelerating the ventilation efficiency of the greenhouse. Compared with directly installing a large fan to blow air into the greenhouse, this device uses the Bernoulli principle to accelerate the speed of natural airflow into the greenhouse, which reduces energy consumption.

[0022] 2. The ventilation device for the vegetable seedling greenhouse uses the power of the temperature control drive component for driving the exhaust fan to rotate, which also comes from the heat in the greenhouse itself, without the need for additional power. When the temperature in the workshop rises to a certain level, part of the heat is transferred to the bimetallic plate through the heat conduction plate, driving the bimetallic plate to bend and trigger the air induction plate on the lower side of the exhaust fan to swing back and forth under the release of the elastic potential energy of the first torsion spring and the upward flowing hot air, and then the exhaust fan is driven to rotate continuously through continuous one-way transmission of the transmission component.

[0023] 3. The ventilation device for the vegetable seedling greenhouse will drive the paddle in the vibration assembly to reciprocate and hit the vibration plate to generate vibration during the continuous rotation of the induced draft plate, so as to shake off the water droplets condensed on the top wall of the greenhouse due to the increase in temperature, thereby avoiding the continuous accumulation of water droplets. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a first overall structural schematic diagram of the present invention.

[0025] Figure 2 It is a second overall structural schematic diagram of the present invention.

[0026] Figure 3 It is a first cross-sectional structural schematic diagram of the ventilation tower in the present invention.

[0027] Figure 4 It is a second cross-sectional structural schematic diagram of the ventilation tower in the present invention.

[0028] Figure 5 for Figure 4 A partial enlarged view of point A in the middle.

[0029] Figure 6 It is a schematic diagram of the exploded structure of the temperature control drive assembly in the present invention.

[0030] Figure 7 It is a schematic diagram of the exploded structure of the vibration component in the present invention.

[0031] Figure 8 It is a schematic diagram of the explosion structure of the power storage component in the present invention.

[0032] In the figure: 100, greenhouse; 110, first vent; 200, ventilation tower; 210, second vent; 220, first rotating rod; 230, exhaust fan; 240, temperature control drive assembly; 241, second rotating rod; 242, air guide plate; 243, first torsion spring; 250, transmission assembly; 251, third rotating rod; 252, first bevel gear; 253, second bevel gear; 254, rotating gear; 255, first rotating drum; 256, dial teeth; 257, ratchet; 258, pawl; 259, spring sheet; 260, power storage assembly; 261, fixed cylinder; 262, slot; 263, fourth rotating rod; 264, block; 265, bimetallic plate; 266, fifth rotating rod; 267, push plate; 268, second torsion spring; 269, motor; 270, vibration assembly; 271, second rotating cylinder; 272, third torsion spring; 273, pull rope; 274, paddle; 275, vibration sheet. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] For example, see Figure 1-Figure 4 A ventilation device for a vegetable seedling greenhouse comprises a greenhouse 100, a plurality of first vents 110 are provided on both sides of the greenhouse 100, a ventilation tower 200 is provided on the top of the greenhouse 100, a second vent 210 is provided on the top of the ventilation tower 200, a first rotating rod 220 is rotatably provided on the ventilation tower 200, and an exhaust fan 230 is provided on the first rotating rod 220;

[0035] The ventilation tower 200 is also provided with a temperature control drive component 240, which drives the exhaust fan 230 to rotate according to the temperature in the greenhouse 100 to form a negative pressure at the second ventilation port 210 to draw the air in the greenhouse 100 out of the greenhouse 100, and introduces the outside air into the greenhouse 100 through a plurality of first ventilation ports 110 for ventilation.

[0036] In this embodiment: a plurality of first vents 110 are symmetrically installed on the side of the greenhouse 100, a ventilation tower 200 is installed on the top wall of the greenhouse, and a second vent 210 is installed on the ventilation tower 200. The ventilation tower 200 is in the shape of a tower with the spire facing upward, which is convenient for airflow gathering. When the temperature control drive assembly 240 is not triggered, the greenhouse 100 can be naturally ventilated through a plurality of first vents 110 and second vents 210. The ventilation time and size should be adjusted according to the actual situation to ensure sufficient air circulation. In winter, in order to prevent the cold airflow from blowing directly to the vegetables grown in the greenhouse, curtains can be installed at a plurality of first vents 110 for shielding.

[0037] A first rotating rod 220 is rotatably mounted on the top wall of the ventilation tower 200, and an exhaust fan 230 is mounted on the first rotating rod 220. The rotation of the exhaust fan 230 will drive part of the air in the greenhouse 100 to be discharged upward through the second vents 210. During this process, the air pressure in the greenhouse 100 decreases, the air becomes thinner, and a negative pressure area is formed. According to the Bernoulli principle, a pressure difference is formed between the inside and outside of the greenhouse 100. The wind pressure at the second vents 210 is high and the pressure is low, which will accelerate the extrusion of the air in the greenhouse 100. At this time, the air pressure in the greenhouse 100 decreases, and the outside air will accelerate through the first vents 110 to enter the greenhouse 100, speeding up the ventilation speed.

[0038] Embodiment 2: This embodiment is an improvement on Embodiment 1. For details, please refer to Figure 3-Figure 8 The temperature control driving assembly 240 includes a second rotating rod 241 rotatably disposed in the ventilation tower 200, and the second rotating rod 241 is provided with an air induction plate 242 and a first torsion spring 243, and the two ends of the first torsion spring 243 are respectively connected to the second rotating rod 241 and the inner wall of the ventilation tower 200;

[0039] The ventilation tower 200 further includes a transmission assembly 250 and a force storage assembly 260. The force storage assembly 260 accumulates the elastic potential energy of the first torsion spring 243, and releases the elastic potential energy of the first torsion spring 243 to drive the second rotating rod 241 to rotate. The transmission between the second rotating rod 241 and the first rotating rod 220 is realized through the transmission assembly 250.

[0040] The transmission assembly 250 includes a third rotating rod 251 rotatably disposed in the ventilation tower 200 , a first bevel gear 252 is disposed on the third rotating rod 251 , a second bevel gear 253 is disposed on the first rotating rod 220 , and the second bevel gear 253 is meshed with the first bevel gear 252 ;

[0041] The transmission assembly 250 further includes a rotating tooth 254 disposed on the third rotating rod 251 . A first rotating drum 255 is rotatably disposed in the greenhouse 100 . The first rotating drum 255 is provided with a plurality of shifting teeth 256 matched with the rotating tooth 254 .

[0042] In this embodiment, a second rotating rod 241 is rotatably mounted on the inner walls of both sides of the ventilation tower 200, a wind guide plate 242 is fixed on the second rotating rod 241, and two ends of the first torsion spring 243 are respectively fixed on the second rotating rod 241 and one inner wall of the greenhouse 100. The second rotating rod 241 is fixed by the force storage component 260, and the first torsion spring 243 is in a twisted state to accumulate elastic potential energy.

[0043] The second rotating rod 241 is released by temperature control triggering, so that the elastic potential energy of the first torsion spring 243 is released, driving the second rotating rod 241 and the air guide plate 242 to reciprocate, and the second rotating rod 241 then drives the first rotating rod 220 to rotate through the transmission assembly 250.

[0044] The function of the air induced plate 242 is that when the exhaust fan 230 starts to rotate and continuously drives the hot air in the greenhouse 100 to be discharged upward through the Bernoulli principle, the air will drive the air induced plate 242 with a larger contact area to swing repeatedly, so that the second rotating rod 241 can continue to rotate.

[0045] In order to realize the transmission between the second rotating rod 241 and the first rotating rod 220, a third rotating rod 251 is rotatably installed on the inner wall of the ventilation tower 200, and the first bevel gear 252 fixed on the third rotating rod 251 is meshed with the second bevel gear 253 fixed on the first rotating rod 220, thereby changing the transmission direction.

[0046] The rotating teeth 254 fixed on the first bevel gear 252 are spur gears. A first rotating drum 255 is rotatably mounted on the inner wall of the ventilation tower 200, and a plurality of shifting teeth 256 are fixed on the first rotating drum 255. Similar to the principle of a spinning top, during the continuous rotation of the first rotating drum 255, the shifting teeth 256 will continuously shift the rotating teeth 254 to rotate, but will not affect the rotation of the rotating teeth 254 itself due to inertia. The rotation of the rotating teeth 254 drives the first bevel gear 252 to rotate, and then the first rotating rod 220 and the exhaust fan 230 are driven to rotate through the transmission of the first bevel gear 252 and the second bevel gear 253.

[0047] Embodiment 3: This embodiment is an improvement made on the basis of Embodiment 2. For details, please refer to Figure 3-Figure 8 The transmission assembly 250 also includes a ratchet 257 disposed on the second rotating rod 241 , a pawl 258 is rotatably disposed in the first rotating cylinder 255 , and the pawl 258 is engaged with the ratchet 257 , and a spring sheet 259 is disposed in the first rotating cylinder 255 to press the pawl 258 against the surface of the ratchet 257 .

[0048] In this embodiment, since the second rotating rod 241 reciprocates under the elastic force of the first torsion spring 243 and the blowing of wind, a one-way transmission is realized. Specifically, a ratchet 257 is fixed on the second rotating rod 241, a ratchet 258 is rotatably mounted on the inner wall of the first rotating cylinder 255 at a position deviating from the center of the circle, and a spring sheet 259 is fixed on the side wall of the first rotating cylinder 255 to press the ratchet 258 toward the ratchet 257. The ratchet 257, the first rotating cylinder 255 and the second rotating rod 241 are coaxial.

[0049] When the second rotating rod 241 rotates counterclockwise, the rotation direction is consistent with the direction of the ratchet 257 teeth, and the rotation direction of the ratchet 257 is opposite to the direction of the pawl 258 teeth. At this time, the pawl 258 will be stuck on the ratchet 257, and the ratchet 257 will drive the pawl 258 and the first rotating drum 255 to rotate, thereby driving the first rotating rod 220 and the exhaust fan 230 to rotate counterclockwise.

[0050] When the second rotating rod 241 rotates clockwise, the direction of rotation of the ratchet 257 is consistent with the direction of the teeth of the pawl 258. At this time, the pawl 258 will swing back and forth under the elastic force of the spring sheet 259. At this time, the ratchet 257 will not drive the pawl 258 and the first rotating cylinder 255 to rotate. On the contrary, the first rotating cylinder 255 and the first rotating rod 220 will continue to rotate counterclockwise under inertia without affecting the clockwise reverse rotation of the ratchet 257.

[0051] In this way, the second rotating rod 241 can perform unidirectional transmission to continuously drive the first rotating rod 220 and the exhaust fan 230 to rotate.

[0052] Embodiment 4: This embodiment is an improvement on Embodiment 3. For details, please refer to Figure 3-Figure 8 The power storage component 260 includes a fixed cylinder 261 disposed on the second rotating rod 241, and a slot 262 is provided on the fixed cylinder 261. A fourth rotating rod 263 is rotatably disposed in the greenhouse 100, and a block 264 is disposed on the fourth rotating rod 263, and the block 264 is movably engaged in the slot 262;

[0053] The power storage assembly 260 further includes a bimetallic plate 265 disposed in the ventilation tower 200. The bimetallic plate 265 is composed of two metal plates with different thermal expansion coefficients. A fifth rotating rod 266 is rotatably disposed on the clamping block 264.

[0054] The fifth rotating rod 266 is provided with a push plate 267, and the push plate 267 is located in the bending direction of the bimetallic plate 265;

[0055] The force storage assembly 260 further includes a second torsion spring 268 and a motor 269 . Two ends of the second torsion spring 268 are respectively connected to the fifth rotating rod 266 and the clamping block 264 . The output shaft of the motor 269 is connected to the fifth rotating rod 266 .

[0056] In this embodiment: in order to fix the second rotating rod 241 when the first torsion spring 243 is twisted and accumulates elastic potential energy, a fixing cylinder 261 is fixed on the surface of the second rotating rod 241, and a clamping groove 262 is provided at the side end of the fixing cylinder 261. A fourth rotating rod 263 is rotatably installed on the inner wall of one side of the ventilation tower 200, and a clamping block 264 is installed on the fourth rotating rod 263. The clamping block 264 is in a broken line shape. When the second rotating rod 241 rotates to fit the clamping block 264, the second rotating rod 241 drives the first torsion spring 243 to be in a twisted state to accumulate elastic potential energy. At this time, the clamping block 264 is stuck in the clamping groove 262 to fix the second rotating rod 241.

[0057] In order to trigger the release of the second rotating rod 241 through temperature control conditions, a bimetallic plate 265 is also installed on the side wall of the ventilation tower 200. The two metal plates constituting the bimetallic plate 265 have a thermal expansion coefficient greater than the thermal expansion coefficient of the metal plate close to the bimetallic plate 266, so that when the temperature in the greenhouse 100 rises and the bimetallic plate 265 is heated, the bimetallic plate 265 bends toward the push plate 267.

[0058] The push plate 267 is rotatably mounted on the block 264. When the bimetal plate 265 bends toward it, the push plate 267 has no space to rotate because the lower end of the push plate 267 is in contact with the block 264. Therefore, the push plate 267 is moved by the bimetal plate 265 to drive the block 264 to rotate. When the push plate 267 rotates, the block 264 is pulled out of the slot 262 to release the fixation of the second rotating rod 241.

[0059] After the fixed cylinder 261 can rotate freely clockwise and counterclockwise, the block 264 will not affect the rotation of the fixed cylinder 261. The bimetallic plate 265 continues to bend downward and will not touch the push plate 267. If the bimetallic plate 265 bends upward to reset and touch the push plate 267, since there is space on the block 264 for the push plate 267 to rotate clockwise, the block 264 will not be driven by the push plate 267. After the bimetallic plate 265 bends upward and breaks away from the push plate 267, the push plate 267 will reset under the elastic force of the second torsion spring 268.

[0060] The output shaft of the motor 269 is connected to the fourth rotating rod 263, and its output shaft can be driven to rotate by an external force when the motor 269 is not running. When it is necessary to stop the rotation of the exhaust fan 230 and cancel the function of accelerating ventilation. After the ventilation pressure inside and outside the greenhouse 100 is gradually balanced, the air induction plate 242 gradually returns to the vertical state, and the fixed cylinder 261 gradually approaches the state where the slot 262 is horizontal to the right. At this time, the motor 269 can drive the block 264 to rotate and adjust the position to match the slot 262 on the fixed cylinder 261, and then drive the block 264 to rotate and insert into the slot 262 to re-fix the fixed cylinder 261.

[0061] Embodiment 5: This embodiment is an improvement on Embodiment 2. For details, please refer to Figure 3-Figure 7 The ventilation tower 200 further includes a vibration assembly 270, which includes a second rotating drum 271 rotatably disposed on the second rotating rod 241, a third torsion spring 272 is sleeved on the second rotating rod 241, and two ends of the third torsion spring 272 are respectively connected to the second rotating rod 241 and the inner wall of the second rotating drum 271;

[0062] A pull rope 273 is wound around the second rotating drum 271 , and a matching paddle 274 and a vibrating plate 275 are provided in the ventilation tower 200 . Two ends of the pull rope 273 are connected to the second rotating drum 271 and the paddle 274 , respectively.

[0063] In this embodiment, when the temperature in the greenhouse 100 rises and the ventilation tower 200 extracts hot air, the water vapor on the top wall of the greenhouse 100 is easily condensed into water droplets. In order to prevent the water droplets from continuously gathering, a second rotating drum 271 is rotatably mounted on the second rotating rod 241, and the second rotating drum 271 and the second rotating rod 241 are driven by a third torsion spring 272. One end of a pull rope 273 is fixed on the surface of the second rotating drum 271, and a paddle 274 is fixed on the other end of the pull rope 273. The paddle 274 is connected to the inner wall of the ventilation tower 200.

[0064] A vibration sheet 275 is also installed on the inner wall of the ventilation tower 200. When the second rotating drum 271 is driven to rotate by the second rotating rod 241, the paddle 274 is pulled by the pull rope 273 to touch the vibration sheet 275 to generate vibration, so that the water droplets on the top wall of the greenhouse 100 are shaken off. The purpose of arranging the transmission between the second rotating drum 271 and the second rotating rod 241 through the third torsion spring 272 is that the second rotating drum 271 can reciprocate more by inertia under the elastic action of the third torsion spring 272.

[0065] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0066] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A ventilation device for a vegetable seedling growing greenhouse, comprising a greenhouse (100), characterized in that: A plurality of first vents (110) are provided on both sides of the greenhouse (100); a ventilation tower (200) is provided on the top of the greenhouse (100); a second vent (210) is provided on the top of the ventilation tower (200); a first rotating rod (220) is rotatably provided on the ventilation tower (200); and an exhaust fan (230) is provided on the first rotating rod (220); The ventilation tower (200) is also provided with a temperature control drive component (240), and the temperature control drive component (240) drives the exhaust fan (230) to rotate according to the temperature in the greenhouse (100) to form a negative pressure at the second ventilation opening (210) to draw the air in the greenhouse (100) out of the greenhouse (100), and introduces external air into the greenhouse (100) through a plurality of the first ventilation openings (110) for ventilation.

2. A ventilation device for vegetable seedling cultivation greenhouse according to claim 1, characterized in that: The temperature control drive assembly (240) comprises a second rotating rod (241) rotatably arranged in the ventilation tower (200), the second rotating rod (241) being provided with an air induction plate (242) and a first torsion spring (243), and two ends of the first torsion spring (243) being respectively connected to the second rotating rod (241) and the inner wall of the ventilation tower (200); The ventilation tower (200) further comprises a transmission assembly (250) and a force storage assembly (260), wherein the force storage assembly (260) stores the elastic potential energy of the first torsion spring (243), and releases the elastic potential energy of the first torsion spring (243) to drive the second rotating rod (241) to rotate, and the transmission assembly (250) realizes transmission between the second rotating rod (241) and the first rotating rod (220).

3. A ventilation device for vegetable seedling cultivation greenhouse according to claim 2, characterized in that: The transmission assembly (250) comprises a third rotating rod (251) rotatably disposed in the ventilation tower (200), a first bevel gear (252) being disposed on the third rotating rod (251), a second bevel gear (253) being disposed on the first rotating rod (220), and the second bevel gear (253) being meshed with the first bevel gear (252).

4. A ventilation device for vegetable seedling cultivation greenhouse according to claim 3, characterized in that: The transmission assembly (250) further comprises a rotating tooth (254) arranged on the third rotating rod (251); a first rotating drum (255) is rotatably arranged in the greenhouse (100); and a plurality of shifting teeth (256) matching the rotating tooth (254) are arranged on the first rotating drum (255).

5. A ventilation device for vegetable seedling cultivation greenhouse according to claim 4, characterized in that: The transmission assembly (250) further comprises a ratchet (257) arranged on the second rotating rod (241); a pawl (258) is rotatably arranged in the first rotating cylinder (255), and the pawl (258) is meshed with the ratchet (257); a spring sheet (259) is arranged in the first rotating cylinder (255) to press the pawl (258) against the surface of the ratchet (257).

6. A ventilation device for vegetable seedling cultivation greenhouse according to claim 2, characterized in that: The power storage component (260) comprises a fixed cylinder (261) arranged on the second rotating rod (241), a clamping slot (262) being provided on the fixed cylinder (261), a fourth rotating rod (263) being rotatably arranged in the greenhouse (100), a clamping block (264) being provided on the fourth rotating rod (263), and the clamping block (264) being movably clamped in the clamping slot (262).

7. A ventilation device for vegetable seedling cultivation greenhouse according to claim 6, characterized in that: The power storage component (260) further comprises a bimetallic plate (265) disposed in the ventilation tower (200), the bimetallic plate (265) being composed of two metal plates having different thermal expansion coefficients, and a fifth rotating rod (266) being rotatably disposed on the clamping block (264).

8. A ventilation device for vegetable seedling cultivation greenhouse according to claim 7, characterized in that: The fifth rotating rod (266) is provided with a push plate (267), and the push plate (267) is located in the bending direction of the bimetallic plate (265); The force storage component (260) further comprises a second torsion spring (268) and a motor (269); two ends of the second torsion spring (268) are respectively connected to the fifth rotating rod (266) and the clamping block (264); and an output shaft of the motor (269) is connected to the fifth rotating rod (266).

9. A ventilation device for vegetable seedling raising greenhouse according to claim 2, characterized in that: The ventilation tower (200) further comprises a vibration assembly (270), wherein the vibration assembly (270) comprises a second rotating drum (271) rotatably disposed on the second rotating rod (241), a third torsion spring (272) being sleeved on the second rotating rod (241), and two ends of the third torsion spring (272) being respectively connected to the second rotating rod (241) and the inner wall of the second rotating drum (271).

10. A ventilation device for a vegetable seedling raising greenhouse according to claim 9, characterized in that: A pull rope (273) is wound around the second rotating drum (271), and a matching paddle (274) and a vibrating plate (275) are provided in the ventilation tower (200), with two ends of the pull rope (273) being connected to the second rotating drum (271) and the paddle (274), respectively.

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