CN109661932A - Heliogreenhouse openable energy conservation side wall - Google Patents

Heliogreenhouse openable energy conservation side wall Download PDF

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Publication number
CN109661932A
CN109661932A CN201910122008.8A CN201910122008A CN109661932A CN 109661932 A CN109661932 A CN 109661932A CN 201910122008 A CN201910122008 A CN 201910122008A CN 109661932 A CN109661932 A CN 109661932A
Authority
CN
China
Prior art keywords
cotton
wadded quilt
side wall
layer
plastic film
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910122008.8A
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Chinese (zh)
Inventor
罗斌
高上
付晶晶
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rural Government Qi Min Science And Technology (tianjin) Co Ltd
Original Assignee
Rural Government Qi Min Science And Technology (tianjin) Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rural Government Qi Min Science And Technology (tianjin) Co Ltd filed Critical Rural Government Qi Min Science And Technology (tianjin) Co Ltd
Priority to CN201910122008.8A priority Critical patent/CN109661932A/en
Publication of CN109661932A publication Critical patent/CN109661932A/en
Pending legal-status Critical Current

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Classifications

    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01GHORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G9/00Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
    • A01G9/14Greenhouses
    • A01G9/1469Greenhouses with double or multiple walls
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01GHORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G13/00Protecting plants
    • A01G13/10Devices for affording protection against animals, birds or other pests
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01GHORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G9/00Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
    • A01G9/24Devices or systems for heating, ventilating, regulating temperature, illuminating, or watering, in greenhouses, forcing-frames, or the like
    • A01G9/246Air-conditioning systems
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/25Greenhouse technology, e.g. cooling systems therefor
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P60/00Technologies relating to agriculture, livestock or agroalimentary industries
    • Y02P60/14Measures for saving energy, e.g. in green houses

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  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Birds (AREA)
  • Zoology (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Catching Or Destruction (AREA)

Abstract

The invention belongs to vegetable planting technology fields, more particularly to a kind of heliogreenhouse openable energy conservation side wall, including ceiling, the ceiling is arc-shaped, and side wall body is equipped between the ceiling and ground, is equipped with knee wall between the side wall body, the knee wall top is fixed on the bottom surface of ceiling, the knee wall bottom end fixes on the ground, and the side wall body is equipped with door body, and the door body is made of pillar and building block brick;The side wall body includes the first cotton-wadded quilt group, the second cotton-wadded quilt group, the first cotton-wadded quilt group includes cotton-wadded quilt layer A, cotton-wadded quilt layer B, cotton-wadded quilt layer C, plastic film layers A, plastic film layers B, plastic film layers C, the plastic film layers A is located between cotton-wadded quilt layer A, cotton-wadded quilt layer B, the plastic film layers B is located between cotton-wadded quilt layer B, cotton-wadded quilt layer C, the cotton-wadded quilt layer C is between plastic film layers B, plastic film layers C, the structure of the second cotton-wadded quilt group is identical as the structure of the first cotton-wadded quilt group, and the inboard of the second cotton-wadded quilt group is equipped with insect prevention stratum reticulare.

Description

Heliogreenhouse openable energy conservation side wall
Technical field
The invention belongs to vegetable planting technology field more particularly to a kind of heliogreenhouse openable energy conservation side walls.
Background technique
With the continuous improvement of people's living standards, it is increasing regardless of the vegetables demand in season for whole year, especially Winter, demand was especially increased obvious around the Spring Festival.So for the need of the heliogreenhouse of anti-season crop can be planted Ask just increasing, but traditional heliogreenhouse generally can only be used to plant half a year, summer is since greenhouse structure is mostly to protect Temperature be main temperature generally exceed the temperature of plant suitable growth, if it is desired to continue production then need for a long time open fan and pad or Negative-pressure air fan carries out side air draft and cools down, but is difficult to realize get a profit since cost is excessively high, directly result in annual half when Between temperature it is indoor production stay cool, this wastes limited land resource significantly, and implementation result is bad.
Summary of the invention
The present invention provides a kind of heliogreenhouse openable energy conservation side wall, to solve summer mentioned above in the background art Greenhouse is due to planting cost excessively high the problem of staying cool.
Technical problem solved by the invention is realized using following technical scheme:
A kind of heliogreenhouse openable energy conservation side wall, including ceiling, the ceiling is arc-shaped, sets between the ceiling and ground There is side wall body, is equipped with knee wall between the side wall body, the knee wall top is fixed on the bottom surface of ceiling, the knee wall Bottom end fixes on the ground, and the side wall body is equipped with door body, and the door body is made of pillar and building block brick;
The side wall body includes the first cotton-wadded quilt group, the second cotton-wadded quilt group, and the first cotton-wadded quilt group includes cotton-wadded quilt layer A, cotton-wadded quilt layer B, cotton Tegillum C, plastic film layers A, plastic film layers B, plastic film layers C, the plastic film layers A are located at cotton-wadded quilt layer A, cotton-wadded quilt layer B Between, the plastic film layers B is located between cotton-wadded quilt layer B, cotton-wadded quilt layer C, and it is thin that the cotton-wadded quilt layer C is located at plastic film layers B, plastics Between film layer C, the structure of the second cotton-wadded quilt group is identical as the structure of the first cotton-wadded quilt group, and the inboard of the second cotton-wadded quilt group is equipped with Insect prevention stratum reticulare,
The edge of the ceiling is equipped with wall edge, and the wall has load-bearing nail along upper nail, and the top of the side wall body is equipped with duck eye, Steel ring is equipped in the duck eye, the load-bearing nail is located in steel ring;
Steelframe is equipped between the first cotton-wadded quilt group, the second cotton-wadded quilt group, the steelframe bottom end fixes on the ground, in the steelframe Equipped with blower.
Further, the knee wall side is equipped with stiff dough material plate, and the stiff dough material plate side is fixedly installed with card Film slot, the side wall body are fixed by screws on film-clamping groove.
Further, fixed built-in fitting is fixedly installed on the ground, the bottom end of the side wall body is fixed on fixed pre- On embedded part.
Further, the side wall body further includes plastic film layers D, plastic film layers E, and the plastic film layers D is located at The outside of first cotton-wadded quilt group, the plastic film layers E are located at the outside of the second cotton-wadded quilt group.
Further, the ceiling, knee wall material be building block brick.
Further, the cotton-wadded quilt layer A, cotton-wadded quilt layer B, every layer of cotton-wadded quilt layer C with a thickness of 2.5cm-3.5cm.
Further, the quantity of the blower is 2.
The invention has the benefit that
The utility model has studied a kind of open-type wall wisdom energy saving sunlight greenhouse, the intelligent energy saving sunlight of side wall openable Room, ceiling are covered using common plastic film of greenhouse, and to draw sunlight, integral form is made into sector using cob wall as support. Greenhouse side wall is the emphasis of our the technical program, and side wall wall is changed to cotton-wadded quilt, and retains the use of blower.In summer, side Wall cotton-wadded quilt detachably only retains fly net, and greenhouse two sides belong to unobstructed state, the penetrating input for facilitating natural wind in two sides, with this It reduces the use duration of blower or fan and pad and negative-pressure air fan can be not turned on, from largely playing energy-conserving action, Its specific advantage is as follows:
1 solves the problems, such as that heliogreenhouse summer can not produce because temperature is excessively high, while the energy consumption of aeration portion is effectively reduced, It is effective to realize energy-saving and emission-reduction.
2 effectively reduce the cost of heliogreenhouse, have saved cost.
3 solve the problems, such as traditional Solar Greenhouse in Winter due to break ground influenced with conventional cement building process weather it is excessive.
4, which realize heliogreenhouse summer, to be compared and traditional side cob wall greenhouse, greatly with the target of consecutive production The service efficiency in soil is improved greatly.
5 side walls can be opened, and can be opened or closed according to seasonal adjustment, guarantee to reach energy-saving and emission-reduction while production environment Target.
6 replace brick wall using cotton-wadded quilt, are layered the wall ratio that hollow structural thermal insulation effect is more preferable, and steelframe is combined with cotton-wadded quilt and pass 90% land used is saved in system rammed earth greenhouse, greatly improves USE RIGHT OF LAND FLOWING.
Detailed description of the invention
Fig. 1 is schematic cross-sectional view of the invention;
Fig. 2 is side schematic view of the invention;
Fig. 3 is the schematic cross-sectional view of side wall body of the present invention;
Fig. 4 is the schematic diagram of blower of the present invention;
Fig. 5 is the structural schematic diagram of stiff dough material plate of the present invention;
In figure: 1- side wall body, 2- blower, 3- ceiling, 4- clingfish mouthful, 5- blower, 6- building block brick knee wall, 7- cob wall, 8- door body, 9- plastic film layers A, 10- steelframe, 11- stiff dough material plate, 12- screw, 13- knee wall, 14- plastic film layers B, 15- insect prevention Stratum reticulare, 16- plastic film layers D, 17- film-clamping groove, 18- plastic film layers C, 19- cotton-wadded quilt layer A, 20- cotton-wadded quilt layer B, 21- cotton-wadded quilt layer The first cotton-wadded quilt group of C, 22-, 23- the second cotton-wadded quilt group.
Specific embodiment
A kind of heliogreenhouse openable energy conservation side wall, including ceiling 3, ceiling 3 is arc-shaped, sets between ceiling 3 and ground There is side wall body 1, is equipped with knee wall 13 between side wall body 1,13 top of knee wall is fixed on the bottom surface of ceiling 3,13 bottom of knee wall End fixes on the ground, and side wall body 1 is equipped with door body 8, and door body 8 is made of pillar and building block brick;
Side wall body 1 include the first cotton-wadded quilt group 22, the second cotton-wadded quilt group 23, the first cotton-wadded quilt group 22 include cotton-wadded quilt layer A19, cotton-wadded quilt layer B20, Cotton-wadded quilt layer C21, plastic film layers A9, plastic film layers B14, plastic film layers C18, plastic film layers A9 be located at cotton-wadded quilt layer A19, Between cotton-wadded quilt layer B20, plastic film layers B14 is located between cotton-wadded quilt layer B20, cotton-wadded quilt layer C21, and cotton-wadded quilt layer C21 is located at plastic film Between layer B14, plastic film layers C19, the structure of the second cotton-wadded quilt group 23 is identical as the structure of the first cotton-wadded quilt group 22, the second cotton-wadded quilt group 23 inboard is equipped with insect prevention stratum reticulare 15.
The edge of ceiling 3 is equipped with wall edge, and wall has a load-bearing nail along upper nail, and the top of side wall body 1 is equipped with duck eye, in duck eye Equipped with steel ring, load-bearing nail is located in steel ring;
Steelframe 10 is equipped between first cotton-wadded quilt group 22, the second cotton-wadded quilt group 23,10 bottom end of steelframe fixes on the ground, sets in steelframe 10 There is blower 2.
13 side of knee wall is equipped with stiff dough material plate 11, and 11 side of stiff dough material plate is fixedly installed with film-clamping groove 17, side wall Body 13 is fixed on film-clamping groove 17 by screw 12.
Fixed built-in fitting is fixedly installed on ground, the bottom end of side wall body 1 is fixed on fixed built-in fitting.
Side wall body 1 further includes plastic film layers D16, and plastic film layers D16 is located at the outside of the first cotton-wadded quilt group.
Ceiling 3, knee wall 13 material be building block brick.
Cotton-wadded quilt layer A, cotton-wadded quilt layer B, cotton-wadded quilt layer C thickness be 2.5cm-3.5cm.
The quantity of blower is 2.
Implementation process:
80cm thickness side wall body is changed to cotton-wadded quilt by the technical program, and cotton-wadded quilt a layer thickness is 3cm or so, and the thickness of entire wall only needs To want 6 layers of cotton-wadded quilt can replace, and reserve the wall 3,6,13 of support canopy body enough in greenhouse side wall, material be building block brick, 6 Lower section is the door 8 that pillar and building block brick are constituted, and remaining metope is then cotton-wadded quilt, and side wall is changed to the another of cotton-wadded quilt by the technical program It is hanging that one feature is that cotton-wadded quilt belongs to, detachably.Wall edge is reserved below at the greenhouse side wall ceiling, wall is walked along according to ceiling radian. Wall along upper nail can load-bearing nail, burrow at cotton-wadded quilt top edge, hole should not be too large, and prevent winter from crossing wind.Thus cotton-wadded quilt may be used Directly hang.Hole on cotton-wadded quilt is fixed by steel ring, prevents cotton-wadded quilt off-line, destruction when hanging up.Each layer of cotton-wadded quilt, requires Wall edge is reserved below at the ceiling, for hanging cotton-wadded quilt.Every layer of cotton-wadded quilt is in design, meeting Aided design layer of plastic film, modeling Expect film size and cotton-wadded quilt wall it is in the same size.Plastic film and cotton-wadded quilt are suspended in lower section at ceiling in the same way and stay Wall out along upper, one layer of cotton-wadded quilt and thin film be it is a set of, 3 layers of cotton-wadded quilt and three-layer thin-film are one group, totally two groups of entire cotton-wadded quilt wall.
Two groups of cotton-wadded quilts constitute by the most inboard of wall, also to add one layer of fly net 15, the size and cotton-wadded quilt of fly net 15 Wall it is in the same size, hang is the same with cotton-wadded quilt, but top can be shut, and fly net 15 does not have to disassembly, and the four seasons are all available.? In addition the outermost by wall that two groups of cotton-wadded quilts are constituted, design one layer and cotton-wadded quilt wall plastic film D16 of a size, for preventing Only winter encounters rain and snow weather and drenches by wall.The matching used plastic film 9,14,18 of every layer of cotton-wadded quilt is winter cotton in order to prevent It is leaked out, multilayer barrier makes more to be kept the temperature in winter by wall.Fly net 15 is when preventing summer cotton-wadded quilt wall from opening, and pest enters temperature Room.In order to prevent after cotton-wadded quilt suspension, the left and right sides is leaked out, and loads onto film-clamping groove in the knee wall body side surface that the left and right sides reserves 17.Film-clamping groove 17 is used to the plastic films such as fixed plastic film 9,14,18 matched with cotton-wadded quilt, in the wall contacted with cotton-wadded quilt 1 13 and ground at, while fixed built-in fitting is set, when guaranteeing in winter, wall is airtight, to do the measure that further keeps warm, Cotton-wadded quilt two sides could be secured to above lateral support wall, fixed with screw 12, between wall 13 and cotton-wadded quilt, with stiff dough material 11。
The intelligent energy saving sunlight greenhouse of side wall openable retains the use of blower 2,5, and blower retains two, respectively wind 2 blower 5 of machine is mounted in the side cotton-wadded quilt wall in greenhouse, between the cotton-wadded quilt of the suspension at first group and second group, by steelframe 10 Support.Either outside greenhouse or in terms of inside, blower 2,5 can't see, only in summer, when the cotton-wadded quilt of two sides is received When rising, blower 2,5 just be will use.The intelligent energy saving sunlight greenhouse of side wall openable the requirement for meeting general greenhouse simultaneously, It is also suitable for fish and vegetable symbiotic systematic difference.Clingfish mouthful 4 can be reserved on cotton-wadded quilt wall, aim at fish and vegetable symbiotic system matches, the mouth 4 It is when not used full closeding state, openable when needed, 4 side lengths of clingfish mouthful are 75cm*75cm.The intelligent section of side wall openable Can heliogreenhouse in winter when, 1 side wall of cotton-wadded quilt will not generally pack up (unlatching), to guarantee warm room temperature.When summer, greenhouse by It in high temperature, needs to divulge information in time, the cotton-wadded quilt 1 of side wall can be removed freely, realize the demand of greenhouse ventilation.
It is special at this either using the cotton-wadded quilt of which kind of material or other heat insulating ability braided materials and hanging or fixed form In the protection scope of benefit.
The embodiments of the present invention have been described in detail above, but content is only the preferred embodiment of the present invention, It should not be considered as limiting the scope of the invention, any changes and modifications in accordance with the scope of the present application, It should still be within the scope of the patent of the present invention.

Claims (7)

1. a kind of heliogreenhouse openable energy conservation side wall, it is characterised in that:
Including ceiling, the ceiling is arc-shaped, and side wall body is equipped between the ceiling and ground, is equipped with branch between the side wall body Buttress, the knee wall top are fixed on the bottom surface of ceiling, and the knee wall bottom end fixes on the ground, on the side wall body Equipped with door body, the door body is made of pillar and building block brick;
The side wall body includes the first cotton-wadded quilt group, the second cotton-wadded quilt group, and the first cotton-wadded quilt group includes cotton-wadded quilt layer A, cotton-wadded quilt layer B, cotton Tegillum C, plastic film layers A, plastic film layers B, plastic film layers C, the plastic film layers A are located at cotton-wadded quilt layer A, cotton-wadded quilt layer B Between, the plastic film layers B is located between cotton-wadded quilt layer B, cotton-wadded quilt layer C, and it is thin that the cotton-wadded quilt layer C is located at plastic film layers B, plastics Between film layer C, the structure of the second cotton-wadded quilt group is identical as the structure of the first cotton-wadded quilt group, and the inboard of the second cotton-wadded quilt group is equipped with Insect prevention stratum reticulare,
The edge of the ceiling is equipped with wall edge, and the wall has load-bearing nail along upper nail, and the top of the side wall body is equipped with duck eye, Steel ring is equipped in the duck eye, the load-bearing nail is located in steel ring;
Steelframe is equipped between the first cotton-wadded quilt group, the second cotton-wadded quilt group, the steelframe bottom end fixes on the ground, in the steelframe Equipped with blower.
2. a kind of heliogreenhouse openable energy conservation side wall according to claim 1, it is characterised in that: the knee wall side Face is equipped with stiff dough material plate, and the stiff dough material plate side is fixedly installed with film-clamping groove, and the side wall body is fixed by screws in On film-clamping groove.
3. a kind of heliogreenhouse openable energy conservation side wall according to claim 2, it is characterised in that: solid on the ground Dingan County is equipped with fixed built-in fitting, and the bottom end of the side wall body is fixed on fixed built-in fitting.
4. a kind of heliogreenhouse openable energy conservation side wall according to claim 3, it is characterised in that: the side wall body is also Including plastic film layers D, the plastic film layers D is located at the outside of the first cotton-wadded quilt group.
5. a kind of heliogreenhouse openable energy conservation side wall according to claim 4, it is characterised in that: the ceiling, branch The material of buttress is building block brick.
6. a kind of heliogreenhouse openable energy conservation side wall according to claim 5, it is characterised in that: the cotton-wadded quilt layer A, Cotton-wadded quilt layer B, every layer of cotton-wadded quilt layer C with a thickness of 2.5cm-3.5cm.
7. a kind of heliogreenhouse openable energy conservation side wall according to claim 6, it is characterised in that: the number of the blower Amount is 2.
CN201910122008.8A 2019-02-19 2019-02-19 Heliogreenhouse openable energy conservation side wall Pending CN109661932A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910122008.8A CN109661932A (en) 2019-02-19 2019-02-19 Heliogreenhouse openable energy conservation side wall

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Application Number Priority Date Filing Date Title
CN201910122008.8A CN109661932A (en) 2019-02-19 2019-02-19 Heliogreenhouse openable energy conservation side wall

Publications (1)

Publication Number Publication Date
CN109661932A true CN109661932A (en) 2019-04-23

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007001438A1 (en) * 2007-01-09 2008-07-24 Bäuerle, Edmund Greenhouse heat insulation system is an inflatable quilted foil mat deployed against roof and sidewalls
CN201450954U (en) * 2009-09-07 2010-05-12 大庆石油学院 Stretching cable type energy-saving greenhouse
CN102845262A (en) * 2012-08-17 2013-01-02 朔州开发区启元农业科技有限公司 Northern vegetable sunlight greenhouse with three layers of greenhouse films
WO2013178039A1 (en) * 2012-05-31 2013-12-05 北京农业智能装备技术研究中心 Groove-type solar greenhouse and method for constructing same
CN106688704A (en) * 2016-12-21 2017-05-24 哈尔滨佳美温室设施有限公司 Heat preservation wall of ecological sunshine greenhouse in cold region
CN207022712U (en) * 2017-08-08 2018-02-23 莒县方氏钢结构有限公司 New semi-slope agricultural greenhouse

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007001438A1 (en) * 2007-01-09 2008-07-24 Bäuerle, Edmund Greenhouse heat insulation system is an inflatable quilted foil mat deployed against roof and sidewalls
CN201450954U (en) * 2009-09-07 2010-05-12 大庆石油学院 Stretching cable type energy-saving greenhouse
WO2013178039A1 (en) * 2012-05-31 2013-12-05 北京农业智能装备技术研究中心 Groove-type solar greenhouse and method for constructing same
CN102845262A (en) * 2012-08-17 2013-01-02 朔州开发区启元农业科技有限公司 Northern vegetable sunlight greenhouse with three layers of greenhouse films
CN106688704A (en) * 2016-12-21 2017-05-24 哈尔滨佳美温室设施有限公司 Heat preservation wall of ecological sunshine greenhouse in cold region
CN207022712U (en) * 2017-08-08 2018-02-23 莒县方氏钢结构有限公司 New semi-slope agricultural greenhouse

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Application publication date: 20190423