CN218007350U - Walnut is planted with bed of growing seedlings that has heating heat preservation function - Google Patents

Walnut is planted with bed of growing seedlings that has heating heat preservation function Download PDF

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Publication number
CN218007350U
CN218007350U CN202222062636.1U CN202222062636U CN218007350U CN 218007350 U CN218007350 U CN 218007350U CN 202222062636 U CN202222062636 U CN 202222062636U CN 218007350 U CN218007350 U CN 218007350U
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China
Prior art keywords
seedling raising
walnut
raising frame
frame
wall
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CN202222062636.1U
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Chinese (zh)
Inventor
李兴胜
赵丰有
赵丰明
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Hubei Fengshen Fruit Co ltd
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Hubei Fengshen Fruit Co ltd
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    • 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

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  • Cultivation Receptacles Or Flower-Pots, Or Pots For Seedlings (AREA)

Abstract

The utility model relates to a walnut is planted and is educated seedling bed technical field, and discloses a walnut is planted with bed of educating seedling that has heating heat preservation function, including the frame of educating seedling, the top of the frame of educating seedling is provided with the frame of growing seedlings, the interior diapire of the frame of growing seedlings is provided with the insulating layer, the top of insulating layer is provided with the heat-conducting layer that is located the geothermol power top, the top of heat-conducting layer is provided with the soil layer of growing seedlings, the inside on the soil layer of growing seedlings is provided with the intercommunication valve that extends to the frame right side of growing seedlings, the top of heat-conducting layer is provided with the temperature sensor who extends to the soil in situ portion of growing seedlings, the right side of the frame of growing seedlings is provided with the temperature controller who is located intercommunication valve top. This walnut is planted with educate seedling bed that has heating heat preservation function can effectively help the user to improve the even effect of moisturizing that waters, and effective person of facilitating the use protects the walnut seedling, has made things convenient for the user to use.

Description

Walnut is planted with bed of growing seedlings that has heating heat preservation function
Technical Field
The utility model relates to a walnut is planted and is educated seedling bed technical field, specifically is a walnut is planted with educate seedling bed that has heating heat preservation function.
Background
Walnut is one of the nut class food that is liked by the people deeply, along with the increase of people to the walnut demand, the efficiency of growing seedlings of walnut also needs to improve day by day, walnut seedling is comparatively fragile needs to be planted after growing seedlings the bed of growing seedlings and cultivating, current walnut is planted with growing seedlings the bed function comparatively single, lack the protection to walnut seedling, and when watering the bed of growing seedlings and moisturizing, because the shower nozzle is most fixed mounting, easily because spray and lead to walnut seedling growth not uniform enough because of spraying, so provide a walnut is planted with the bed of growing seedlings that has the heating heat preservation function and solve the above-mentioned problem that provides.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
The utility model provides a walnut is planted with educating seedbed that has heating heat preservation function has possessed the advantage that is convenient for improve walnut seedling protection effect, has solved current walnut and has planted with educating seedbed function comparatively single, lacks the protection to the walnut seedling, and when watering the moisturizing to educating seedbed, because the big fixed mounting of shower nozzle leads to the problem that the walnut seedling grows up to differ in size because of spraying inadequately evenly easily.
(II) technical scheme
For realize above-mentioned improvement of being convenient for to walnut seedling protection effect purpose, the utility model provides a following technical scheme: a seedling bed with heating and heat preservation functions for walnut planting comprises a seedling raising frame, wherein a seedling raising frame is arranged at the top of the seedling raising frame, a heat insulation layer is arranged on the inner bottom wall of the seedling raising frame, a geothermal wire is arranged at the top of the heat insulation layer, a heat conduction layer located at the top of the geothermal wire is arranged at the top of the heat insulation layer, a soil seedling raising layer is arranged at the top of the heat conduction layer, a communication valve extending to the right side of the seedling raising frame is arranged inside the soil seedling raising layer, a temperature sensor extending to the inside of the soil seedling raising layer is arranged at the top of the heat conduction layer, a temperature controller located above the communication valve is arranged on the right side of the seedling raising frame, a cover plate extending to the top of the seedling raising frame is arranged on the left side of the seedling raising frame, a vent pipe extending to the bottom of the cover plate is arranged at the top of the cover plate, a water tank located on the left side of the seedling raising frame is arranged at the top of the water tank, a water delivery pipe is arranged at the water outlet end of the water pump, a spraying assembly extending to the left side of the seedling raising frame and communicating with the water delivery pipe is arranged at the right side of the cover plate, a limiting assembly clamped with the right side of the inner wall of the seedling raising frame, and extending to the top of the limiting assembly;
the spraying assembly comprises a connecting box, a supporting plate fixedly connected with the seedling raising frame is arranged on the right side of the inner wall of the connecting box, an electric push rod is arranged at the top of the supporting plate, a pushing block slidably connected with the inner top wall of the connecting box is arranged at the output end of the electric push rod, the bottom of the pushing block extends to the bottom of the supporting plate and is provided with a rack plate, a rotating shaft positioned below the supporting plate is arranged on the right side of the inner wall of the connecting box, a gear meshed with the bottom of the rack plate is arranged on the outer side of the rotating shaft, a water distributor penetrating through and extending to the left side of the seedling raising frame and communicated with a water delivery pipe is arranged on the left side of the rotating shaft, and a spray head positioned in the seedling raising frame is arranged at the bottom of the water distributor;
spacing subassembly includes the mounting box, the bottom of apron is provided with the mounting box that extends to the frame inside of growing seedlings, the interior diapire of mounting box is provided with the sliding plate, the right side of sliding plate be provided with extend to the mounting box right side and with the clamping block of the frame inner wall right side block of growing seedlings, the left side of sliding plate be provided with mounting box inner wall fixed connection's spacing spring, the inner wall right side of mounting box is provided with the wedge with the laminating of sliding plate top, the top of wedge is provided with the catch bar that runs through and extend to the apron top.
Preferably, the left side fixed mounting of intercommunication valve has the filter screen, the top fixed mounting of apron has the handle, the inside fixed mounting of breather pipe has the filter screen cloth, the left side fixed mounting of water tank has rather than the water intaking valve of inside intercommunication.
Preferably, the left side of the inner wall of the connecting box is in an opening shape, and a rectangular hole matched with the moving track of the pushing block is formed in the supporting plate.
Preferably, the left side and the right side of the inner wall of the seedling raising frame are both fixedly provided with bearings, and the water separator is rotatably connected with the seedling raising frame through the bearings.
Preferably, the right side of the inner wall of the seedling raising frame is provided with a clamping groove matched with the clamping block, and the right side of the inner wall of the mounting box is provided with a through hole matched with the clamping block.
Preferably, the top of sliding plate is the arc design, the bottom of wedge is the slope design, the round hole with catch bar looks adaptation is seted up to the inside of apron, the top fixed mounting of catch bar has the press pad.
(III) advantageous effects
Compared with the prior art, the utility model provides a walnut is planted with bed of educating seedling that has heating heat preservation function possesses following beneficial effect:
this walnut is planted with educate seedling bed that has heating heat preservation function, through setting up electric putter and water pump, the water pump takes out the water in the water tank and carries to the water knockout drum through the raceway, the water knockout drum carries water to the shower nozzle and sprays, effective person of facilitating the use waters the moisturizing to the walnut seedling, electric putter drives the reciprocal back-and-forth movement of catch block simultaneously, catch block drive rack plate moves forward or backward, rack plate and gear engagement, it is rotatory to make the gear drive pivot, the pivot drives the water knockout drum and swings at the frame internal rotation of growing seedlings, make the shower nozzle swing when spraying, thereby the effect when the shower nozzle sprays has been improved, effectively help the user to improve the even effect that moisturizes and waters, through setting up the apron, the apron can the person of facilitating the use protects the walnut seedling under the more condition of insect, when the user needs open the apron, the handle at user top of apron and press down the catch bar, the catch bar promotes wedge extrusion sliding plate, make the sliding plate extrude spacing spring and take the block to break away from the block with the frame of growing seedlings, can open the apron, thereby the person of facilitating the use shines the walnut seedling.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is an enlarged schematic view of a point a in fig. 1 according to the present invention.
In the figure: the seedling raising device comprises a seedling raising frame 1, a seedling raising frame 2, a thermal insulation layer 3, a ground heating wire 4, a heat conduction layer 5, a soil seedling raising layer 6, a communicating valve 7, a spraying assembly 8, a connecting box 81, a supporting plate 82, an electric push rod 83, a pushing block 84, a rack plate 85, a rotating shaft 86, a gear 87, a water separator 88, a sprayer 89, a limiting assembly 9, a mounting box 91, a sliding plate 92, a fixture block 93, a limiting spring 94, a wedge-shaped block 95, a pushing rod 96, a temperature sensor 10, a temperature controller 11, a cover plate 12, a vent pipe 13, a water tank 14, a water pump 15 and a water delivery pipe 16.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.
Referring to fig. 1-2, a walnut planting seedling raising bed with heating and heat preservation functions comprises a seedling raising frame 1, a seedling raising frame 2 is fixedly installed at the top of the seedling raising frame 1, a heat insulation layer 3 is fixedly installed on the inner bottom wall of the seedling raising frame 2, a ground heat wire 4 is fixedly installed at the top of the heat insulation layer 3, a heat conduction layer 5 located at the top of the ground heat wire 4 is fixedly installed at the top of the heat conduction layer 3, a soil seedling raising layer 6 is placed at the top of the heat conduction layer 5, a communication valve 7 extending to the right side of the seedling raising frame 2 is fixedly installed inside the soil seedling raising layer 6, a filter screen is fixedly installed on the left side of the communication valve 7, a temperature sensor 10 extending to the inside of the soil seedling raising layer 6 is fixedly installed at the top of the heat conduction layer 5, a temperature controller 11 located above the communication valve 7 is fixedly installed on the right side of the seedling raising frame 2, the temperature sensor 10 and the ground heat wire 4 are both electrically connected with the temperature controller 11, a cover plate 12 extending to the top of the seedling raising frame 2 is movably installed on the left side of the seedling raising frame 2, a vent pipe 13 extending to the bottom of the cover plate is fixedly installed at the top of the cover plate 12, a water tank is fixedly installed inside, a water pump 14 fixedly installed inside of the water tank, and a water pump 15 fixedly connected with a water pump 14, and a water pump 15 connected with a water pump.
The right side of the seedling raising frame 2 is fixedly provided with a spraying component 8 which penetrates to the left side of the seedling raising frame 2 and is communicated with the water conveying pipe 16, the spraying component 8 comprises a connecting box 81, the right side of the inner wall of the connecting box 81 is fixedly provided with a supporting plate 82 fixedly connected with the seedling raising frame 2, the top of the supporting plate 82 is fixedly provided with an electric push rod 83, the output end of the electric push rod 83 is fixedly connected with a pushing block 84 which is in sliding connection with the inner top wall of the connecting box 81, the bottom of the pushing block 84 extends to the bottom of the supporting plate 82 and is fixedly connected with a rack plate 85, the left side of the inner wall of the connecting box 81 is in an open shape, the inside of the supporting plate 82 is provided with a rectangular hole matched with the moving track of the pushing block 84, the right side of the inner wall of the connecting box 81 is rotatably connected with a rotating shaft 86 which is positioned below the supporting plate 82, the outer side of the rotating shaft 86 is fixedly provided with a gear 87 which is meshed with the bottom of the rack plate 85, the left side of the rotating shaft 86 is fixedly connected with a water distributor 88 which penetrates and extends to the left side of the seedling raising frame 2 and is communicated with the water conveying pipe 16, the bearings are fixedly mounted on the left side and the right side of the inner wall of the seedling raising frame 2, the water distributor 88 is rotatably connected with the seedling raising frame 2 through the bearings, the bottom of the water distributor 88 is communicated with the spray heads 89 positioned in the seedling raising frame 2, the number of the spray heads 89 is a plurality, the walnut planting machine is provided with a seedling raising bed with a heating and heat preservation function, through the arrangement of the electric push rod 83 and the water pump 15, the water pump 15 pumps water in the water tank 14 out and conveys the water to the water distributor 88 through the water conveying pipe 16, the water distributor 88 conveys the water to the spray heads 89 for watering, a user can effectively and conveniently carry out watering and moisture preservation on walnut seedlings, meanwhile, the electric push rod 83 drives the pushing block 84 to reciprocate back and forth, the pushing block 84 drives the rack plate 85 to move forwards or backwards, the rack plate 85 is meshed with the gear 87, the gear 87 drives the rotating shaft 86 to rotate, and the rotating shaft 86 drives the water distributor 88 to rotate and swing in the seedling raising frame 2, make shower nozzle 89 swing when spraying to improve the effect when shower nozzle 89 sprays, effectively helped the user to improve the even effect of moisturizing that waters.
The bottom of the cover plate 12 is fixedly provided with a limiting component 9 clamped with the right side of the inner wall of the seedling raising frame 2, the top of the limiting component 9 penetrates through and extends to the top of the cover plate 12, the limiting component 9 comprises a mounting box 91, the bottom of the cover plate 12 is fixedly provided with a mounting box 91 extending to the inside of the seedling raising frame 2, the inner bottom wall of the mounting box 91 is slidably connected with a sliding plate 92, the right side of the sliding plate 92 is fixedly connected with a clamping block 93 extending to the right side of the mounting box 91 and clamped with the right side of the inner wall of the seedling raising frame 2, the right side of the inner wall of the seedling raising frame 2 is provided with a clamping groove matched with the clamping block 93, the right side of the inner wall of the mounting box 91 is provided with a through hole matched with the clamping block 93, the left side of the sliding plate 92 is fixedly provided with a limiting spring 94 fixedly connected with the inner wall of the mounting box 91, the right side of the inner wall of the mounting box 91 is slidably connected with a pushing block 95 jointed with the top of the sliding plate 92, the top of the wedge block 95 is fixedly connected with a pushing rod 96 penetrating through and extending to the top of the cover plate 12, the top of the sliding plate 92 is arc-shaped design, the bottom of the wedge-shaped block 95 is obliquely designed, the pushing pad is fixedly arranged at the top of the pushing rod 96, the seedling bed with the heating and heat preservation functions for walnut planting is provided with the cover plate 12, the cover plate 12 can be convenient for a user to protect walnut seedlings under the condition of more insects, when a user needs to open the cover plate 12, the user holds the handle at the top of the cover plate 12 and presses the push rod 96, the push rod 96 pushes the wedge-shaped block 95 to extrude the sliding plate 92, so that the sliding plate 92 extrudes the limit spring 94 and the clamping block 93 is disengaged from the seedling raising frame 2, can open apron 12 to the person of facilitating the use carries out the illumination with walnut seedling, improves walnut seedling's growth, and effective person of facilitating the use protects walnut seedling.
When using, the user carries out the automation through temperature controller 11 and temperature sensor 10 to the growth ambient temperature of walnut seedling and samples the control to accessible temperature controller 11 control ground heat line 4 improves the ground temperature, and effective person of facilitating the use heats the growth environment of walnut seedling and keeps warm, has made things convenient for the user to use.
It should be noted that the electrical components appearing in the document are all electrically connected with an external master controller and a mains supply, the master controller can be a conventional known device for controlling a computer and the like, the standard parts used in the document can be purchased from the market, the specific connection mode of each part is connected by conventional means such as bolts, rivets, welding and the like mature in the prior art, the machines, the parts and the devices are of the conventional type in the prior art, the circuit connection is of the conventional connection mode in the prior art, and the content which is not described in detail in the description belongs to the prior art known to those skilled in the art, and the detailed description is not provided.
In conclusion, the seedling bed with the heating and heat preservation functions for walnut planting is characterized in that the electric push rod 83 and the water pump 15 are arranged, the water pump 15 pumps water in the water tank 14 and conveys the water to the water distributor 88 through the water conveying pipe 16, the water distributor 88 conveys the water to the spray head 89 for spraying, watering and moisture preservation of walnut seedlings are effectively facilitated for a user, meanwhile, the electric push rod 83 drives the pushing block 84 to move back and forth in a reciprocating mode, the pushing block 84 drives the rack plate 85 to move forwards or backwards, the rack plate 85 is meshed with the gear 87, the gear 87 drives the rotating shaft 86 to rotate, the rotating shaft 86 drives the water distributor 88 to rotate and swing in the seedling frame 2, the spray head 89 swings while spraying, the effect of the spray head 89 during spraying is improved, the uniform watering and moisture preservation effect of the user is effectively improved, and by arranging the cover plate 12, but apron 12 person of facilitating the use protects walnut seedling under the more condition of insect, when the user need open apron 12, the user holds the handle at apron 12 top and presses catch bar 96, catch bar 96 promotes wedge 95 extrusion sliding plate 92, make sliding plate 92 extrude spacing spring 94 and take fixture block 93 to break away from with the block of frame 2 of growing seedlings, can open apron 12, thereby person of facilitating the use carries out the illumination with walnut seedling, the growth of walnut seedling is improved, effective person of facilitating the use protects walnut seedling, user's use has been made things convenient for, it is comparatively single with seedling bed function to have solved current walnut planting, lack the protection to walnut seedling, and when moisturizing to seedling bed waters, because the most fixed mounting of shower nozzle, easily because of spraying the problem that leads to walnut seedling growth size not uniform enough.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (6)

1. The seedling bed with the heating and heat preservation functions for walnut planting comprises a seedling raising frame (1), wherein a seedling raising frame (2) is arranged at the top of the seedling raising frame (1), a heat insulation layer (3) is arranged on the inner bottom wall of the seedling raising frame (2), a ground heating wire (4) is arranged at the top of the heat insulation layer (3), a heat conduction layer (5) located at the top of the ground heating wire (4) is arranged at the top of the heat conduction layer (3), a soil seedling raising layer (6) is arranged at the top of the heat conduction layer (5), a communication valve (7) extending to the right side of the seedling raising frame (2) is arranged inside the soil seedling raising layer (6), a temperature sensor (10) extending to the inside of the soil seedling raising layer (6) is arranged at the top of the heat conduction layer (5), a temperature control instrument (11) located above the communication valve (7) is arranged on the right side of the seedling raising frame (2), a cover plate (12) extending to the top of the seedling raising frame (2) is arranged on the left side of the seedling raising frame (2), a vent pipe (13) extending to the bottom of the cover plate (12) is arranged at the top of the cover plate (12), a water tank (14) is arranged at the top of the water tank (14) and a water outlet pipe (15) communicated with a water pump (15) arranged inside of the water tank (14), the method is characterized in that: a spraying assembly (8) which penetrates through the left side of the seedling raising frame (2) and is communicated with a water conveying pipe (16) is arranged on the right side of the seedling raising frame, a limiting assembly (9) which is clamped with the right side of the inner wall of the seedling raising frame (2) is arranged at the bottom of the cover plate (12), and the top of the limiting assembly (9) penetrates through and extends to the top of the cover plate (12);
the spraying assembly (8) comprises a connecting box (81), a supporting plate (82) fixedly connected with the seedling raising frame (2) is arranged on the right side of the inner wall of the connecting box (81), an electric push rod (83) is arranged at the top of the supporting plate (82), a pushing block (84) in sliding connection with the inner top wall of the connecting box (81) is arranged at the output end of the electric push rod (83), the bottom of the pushing block (84) extends to the bottom of the supporting plate (82) and is provided with a rack plate (85), a rotating shaft (86) positioned below the supporting plate (82) is arranged on the right side of the inner wall of the connecting box (81), a gear (87) meshed with the bottom of the rack plate (85) is arranged on the outer side of the rotating shaft (86), a water distributor (88) penetrating and extending to the left side of the seedling raising frame (2) and communicated with the water delivery pipe (16) is arranged on the left side of the rotating shaft (86), and a spray head (89) positioned inside the seedling raising frame (2) is arranged on the bottom of the water distributor (88);
spacing subassembly (9) include mounting box (91), the bottom of apron (12) is provided with mounting box (91) that extend to the frame of growing seedlings (2) inside, the interior diapire of mounting box (91) is provided with sliding plate (92), the right side of sliding plate (92) is provided with and extends to mounting box (91) right side and with block (93) of the block of growing seedlings frame (2) inner wall right side block, the left side of sliding plate (92) is provided with spacing spring (94) with mounting box (91) inner wall fixed connection, the inner wall right side of mounting box (91) is provided with wedge (95) with sliding plate (92) top laminating, the top of wedge (95) is provided with and runs through and extends to catch bar (96) at apron (12) top.
2. A walnut is planted and is used nursery bed that has heating heat preservation function according to claim 1, characterized in that: the left side fixed mounting of intercommunication valve (7) has the filter screen, the top fixed mounting of apron (12) has the handle, the inside fixed mounting of breather pipe (13) has the filter screen cloth, the left side fixed mounting of water tank (14) has rather than the water intaking valve of inside intercommunication.
3. A walnut is planted and is used nursery bed that has heating heat preservation function according to claim 1, characterized in that: the left side of the inner wall of the connecting box (81) is in an opening shape, and a rectangular hole matched with the moving track of the pushing block (84) is formed in the supporting plate (82).
4. A walnut is planted and is used nursery bed that has heating heat preservation function according to claim 1, characterized in that: the seedling raising frame is characterized in that bearings are fixedly mounted on the left side and the right side of the inner wall of the seedling raising frame (2), and the water distributor (88) is rotatably connected with the seedling raising frame (2) through the bearings.
5. A walnut is planted and is used nursery bed that has heating heat preservation function according to claim 1, characterized in that: the right side of the inner wall of the seedling raising frame (2) is provided with a clamping groove matched with the clamping block (93), and the right side of the inner wall of the mounting box (91) is provided with a through hole matched with the clamping block (93).
6. A seedling raising bed with heating and heat preservation functions for walnut planting according to claim 1, characterized in that: the top of the sliding plate (92) is designed in an arc shape, the bottom of the wedge-shaped block (95) is designed in an inclined mode, a round hole matched with the push rod (96) is formed in the cover plate (12), and a pressing pad is fixedly mounted at the top of the push rod (96).
CN202222062636.1U 2022-08-03 2022-08-03 Walnut is planted with bed of growing seedlings that has heating heat preservation function Active CN218007350U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202222062636.1U CN218007350U (en) 2022-08-03 2022-08-03 Walnut is planted with bed of growing seedlings that has heating heat preservation function

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202222062636.1U CN218007350U (en) 2022-08-03 2022-08-03 Walnut is planted with bed of growing seedlings that has heating heat preservation function

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Publication Number Publication Date
CN218007350U true CN218007350U (en) 2022-12-13

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CN202222062636.1U Active CN218007350U (en) 2022-08-03 2022-08-03 Walnut is planted with bed of growing seedlings that has heating heat preservation function

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