CN217217637U - Afforestation plant winter protection shelters from device - Google Patents
Afforestation plant winter protection shelters from device Download PDFInfo
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- CN217217637U CN217217637U CN202220701371.2U CN202220701371U CN217217637U CN 217217637 U CN217217637 U CN 217217637U CN 202220701371 U CN202220701371 U CN 202220701371U CN 217217637 U CN217217637 U CN 217217637U
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/25—Greenhouse technology, e.g. cooling systems therefor
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Abstract
The utility model relates to an afforestation plant winter protection shelters from device, including wrapping up in tree cloth, foil and thread gluing area, it is the rectangle to wrap up in tree cloth, foil is rectangular shape, including horizontal foil and/or vertical foil, foil is fixed to be located wrap up in on the lateral surface of tree cloth or set up in the intermediate layer of wrapping up in tree cloth, horizontal foil's extending direction with the topside of wrapping up in tree cloth is parallel, vertical foil's extending direction with the topside of wrapping up in tree cloth is perpendicular, the one end in thread gluing area with a side fixed connection of wrapping up in tree cloth, the thread gluing area with wrap up in the parallel of tree cloth. When the tree wrapping cloth is used, the tree wrapping cloth is wrapped on a trunk, so that the metal sheet is bent along the shape of the trunk, and then the metal sheet is bundled and clamped by the thread gluing tape, and the metal sheet can be detached from the trunk only by opening the thread gluing tape during detachment. The utility model discloses construction convenience, labour saving and time saving, and can used repeatedly.
Description
Technical Field
The utility model relates to an afforestation plant winter protection shelters from device belongs to trees winter protection technical field.
Background
In northern China, in cold seasons (mainly winter), landscaping plants (mainly trees) are usually protected from cold so as to avoid frost damage or freeze death of the trees. The traditional tree cold-proof protection method is that non-woven fabrics and plastic cloth are wound on the trunk of a tree and are fixed, the operation mode is simple, the winding process is time-consuming and long, the tightness is difficult to master, and the situation that the non-woven fabrics or the plastic cloth fall off from the trunk in the later period due to the fact that the non-woven fabrics or the plastic cloth are wound loosely frequently occurs. In addition, after a cold season, the non-woven fabric or plastic cloth wound around the trunk is usually torn off from the trunk and discarded as garbage, which causes serious waste.
SUMMERY OF THE UTILITY MODEL
In order to overcome the above defects of the prior art, the utility model provides a device is sheltered from in afforestation plant winter protection, and the winter protection is effectual, construction convenience is quick and recoverable used repeatedly.
The utility model discloses realize that the technical scheme of above-mentioned purpose is: the utility model provides a afforestation plant winter protection shelters from device, is including wrapping up in tree cloth, foil and thread gluing area (adopt the belt of thread gluing structure or install the belt of thread gluing, rectangular shape), it is the rectangle to wrap up in tree cloth, foil is rectangular shape, fixes to be located wrap up in the lateral surface of tree cloth or the intermediate layer of wrapping up in tree cloth, including horizontal foil and/or vertical foil, horizontal foil's extending direction with the topside of wrapping up in tree cloth is parallel, vertical foil's extending direction with the topside of wrapping up in tree cloth is perpendicular, the thread gluing area one end with wrap up in a side fixed connection of tree cloth, the thread gluing area with the topside of wrapping up in tree cloth is parallel.
Preferably, the length of the transverse metal sheet is the same as the length of the top edge of the tree wrap.
Preferably, two ends of the transverse metal sheet are flush with corresponding side edges of the tree wrapping cloth respectively.
Preferably, the length of the vertical metal sheet is the same as that of the side edge of the tree wrapping cloth.
Preferably, two ends of the vertical metal sheet are flush with the top edge and the bottom edge of the tree wrapping cloth respectively.
Preferably, the number of the transverse metal sheets is several, and several metal sheets are distributed at intervals along the up-and-down direction (or vertical direction) of the tree wrapping cloth.
Preferably, the number of the vertical metal sheets is several, and the several vertical metal sheets are distributed at intervals along the left and right direction (or lateral direction) of the tree wrapping cloth.
Furthermore, at least one of the metal sheets is positioned at the upper part of the tree wrapping cloth, and at least one of the metal sheets is positioned at the lower part of the tree wrapping cloth.
Preferably, the number of the fastening tapes is a plurality, and the fastening tapes are distributed at intervals along the vertical direction (or called vertical direction) of the tree wrapping cloth.
Furthermore, at least one of the fastening tapes is positioned at the upper part of the tree wrapping cloth, and at least one of the fastening tapes is positioned at the lower part of the tree wrapping cloth.
Preferably, the thickness of the metal sheet is 0.2 to 0.5 mm.
The metal sheet can be an aluminum sheet, and can also adopt other metal sheets capable of being plastically deformed, and the hardness degree of the metal sheet is moderate, so that the metal sheet is easily deformed into a shape capable of enabling the tree wrapping cloth to be attached (attached) to the trunk by manpower in the operation of wrapping the trunk, and the shape can be always kept unchanged under the normal use condition.
Preferably, a positioning rod is fixedly arranged on the other side edge, opposite to the side edge provided with the fastening tape, of the tree wrapping cloth, the positioning rod is parallel to the side edge of the tree wrapping cloth, the lower end of the positioning rod extends downwards out of the bottom edge of the tree wrapping cloth, and the bottom end of the positioning rod is a tip end.
Preferably, the top end of the positioning rod is flush with the top edge of the tree wrapping cloth.
The positioning rod can be a bamboo stick or an iron drill rod and can be fixed (by sewing, bonding, fixing pieces made of metal strips, fixing by rivets and other fixing modes or a combination of a plurality of fixing modes) on the surface or in the interlayer of the tree wrapping cloth.
Preferably, the tree wrapping cloth sequentially comprises a non-woven fabric layer, a cotton cloth layer and a canvas layer from inside to outside, and the non-woven fabric layer, the cotton cloth layer and the canvas layer are sewn or bonded into a whole.
The sheet metal (and the positioning rod) can be fixed (by sewing, bonding, fixing means such as a fixing member made of metal strips, rivet fixing, or a combination of fixing means) on the inner or outer surface of the canvas layer.
Preferably, the thickness of the non-woven fabric layer is 1-2mm, the thickness of the cotton fabric layer is 2-5mm, the thickness of the canvas layer is 0.5-1mm, and other dimensions can be selected according to actual needs.
Preferably, the length of the side edge of the tree wrapping cloth can be 50-180cm, and other sizes can be selected according to actual needs.
The utility model has the advantages that:
1) when the tree wrapping cloth is wrapped on the trunk, the metal sheet is subjected to plastic bending deformation along the circumferential direction or the vertical direction of the trunk at the corresponding position by manually pulling the tree wrapping cloth or bending the metal sheet by pressing by hand, the tree wrapping cloth is preliminarily fixed on the trunk and is attached (pressed) to the surface of the trunk, and then the thread gluing belt is tightened and bonded along the circumferential direction of the trunk, so that the final fixation of the tree wrapping cloth on the trunk can be completed, and the tree wrapping cloth is convenient and rapid to construct and has high efficiency;
2) after cold seasons (mainly winter), the utility model can be completely taken down from the trunk only by opening the magic tape, and can be reused in the next cold season, thereby having high reusability and effectively saving cost;
3) the arrangement of the positioning rod is characterized in that before the tree wrapping cloth is wrapped on a trunk, the positioning rod is firstly tightly attached to the trunk and vertically inserted into soil at the root of a tree, the side edge of the tree wrapping cloth where the positioning rod is located is tightly attached to the surface of the trunk and fixed, and then the tree wrapping cloth is wrapped on the trunk, so that even if the pulling force applied to the tree wrapping cloth in the wrapping process is too large (within the normal pulling force range of manually winding the tree wrapping cloth), the tree wrapping cloth cannot slide or fall off along the surface of the trunk, the wrapping construction of the tree wrapping cloth on the trunk is facilitated to be rapidly completed, the wrapping tightness of the tree wrapping cloth on the trunk is facilitated to be improved, and the cold-proof and heat-preservation effects are improved;
4) the multi-layer structure of the tree wrapping cloth is arranged, so that the cold-proof heat-preservation effect of the tree wrapping cloth is improved, the toughness and the structural strength of the tree wrapping cloth are improved, the tree wrapping cloth is not easy to damage, the affinity of the tree wrapping cloth with the surface of a trunk is guaranteed, and the tree wrapping cloth can not damage the surface of the trunk after being wrapped for a long time.
Drawings
FIG. 1 is a schematic view of the construction of one embodiment provided with transverse metal sheets;
FIG. 2 is a schematic view of the construction of one embodiment provided with vertical foils;
FIG. 3 is a schematic view of the construction of one embodiment provided with transverse and vertical foils;
fig. 4 is a schematic cross-sectional structure of the tree wrapping cloth.
Detailed Description
All directional indicators (e.g., upper, lower, left, right, top, bottom, inner, outer, etc.) in the embodiments of the present invention are only used to explain the relative position relationship between the components in a specific posture (as shown in the drawings), and do not constitute the limitation of the actual using direction, and if the specific posture is changed, the directional indicator is correspondingly changed accordingly.
Referring to fig. 1-4, the utility model discloses an afforestation plant winter protection shelters from device, mainly used trees are cold-proof in cold seasons (mainly refer to winter), including parcel tree cloth 1, foil 2 and thread gluing area (or called magic tape, be rectangular shape) 3, the foil can be horizontal foil 2 (refer to fig. 1), also can be vertical foil 5 (refer to fig. 2), also can be horizontal foil 2 and vertical foil 5 (refer to fig. 3), parcel tree cloth is rectangle (usually vertical rectangle) for wrapping up the trunk of trees, the metal sheet is in a strip shape and is fixedly arranged on the outer side surface of the tree wrapping cloth or in the interlayer, one end of the thread gluing belt is fixedly connected with the left side edge of the tree wrapping cloth, and the thread gluing belt is parallel to the top edge of the tree wrapping cloth.
The length of the foil may be generally the same as the size of the cloth in the respective direction, or slightly smaller. For example, the transverse foil is preferably of the same length as the top edge of the cloth, with the left end flush with the left side of the cloth and the right end flush with the right side of the cloth.
The arrangement of the metal sheet can be used for supporting the tree wrapping cloth in one or two directions, is convenient to operate and is beneficial to keeping the shape attached to a trunk unchanged for a long time. The tree wrapping cloth is convenient for people to unfold and then is rectangular or similar to the rectangular shape, so that the tree wrapping cloth is convenient to wrap the trunk, and can be preliminarily fixed on the trunk through bending deformation when being wrapped on the trunk, so that the tree wrapping cloth is not required to be manually supported, and the subsequent construction operation is convenient.
The quantity of the metal sheets in any direction is preferably a plurality of metal sheets which are distributed at intervals in the corresponding vertical direction, so that the supporting strength of the tree wrapping cloth is improved, and the stability of the tree wrapping cloth after being preliminarily wrapped on a trunk is driven by bending deformation.
In practice, when several transverse metal sheets are provided, one is preferably located at the upper part of the cloth and the other is located at the lower part of the cloth, so that the upper and lower parts of the cloth can be effectively supported, and after the cloth is preliminarily wrapped and fixed on the trunk, the upper and lower parts can be guaranteed to meet the basic stability requirement. For example, the number of transverse foils is two, one in the upper part of the sheet and the other in the lower part of the sheet, the distance between the transverse foil in the upper part and the top edge of the sheet being the same as the distance between the transverse foil in the lower part and the bottom edge of the sheet being less than the distance between two transverse foils.
The thickness of the metal sheet is preferably 0.2-0.5mm, and the width is preferably 1-5cm, so that the metal sheet has enough strength and is convenient for bending deformation, and other sizes can be selected according to actual needs.
The metal sheet can be a soft metal sheet with certain hardness, such as an aluminum sheet.
In practical applications, aluminum wires, even iron wires, etc. may be used instead of the metal sheets, and the diameter of the iron wires is preferably 0.2-0.5mm, and other sizes may be selected according to practical requirements.
The thread gluing belt is used for finally fixing the tree wrapping cloth on the trunk, and after the tree wrapping cloth is wrapped on the trunk and is primarily fixed through the metal sheet, the thread gluing belt is tightened and bonded along the circumferential direction of the trunk, so that the final wrapping and fixing of the tree wrapping cloth on the trunk is completed. The number of the fastening tapes is preferably a plurality of, and the fastening tapes are distributed at intervals along the vertical direction of the tree wrapping cloth so as to improve the fixing effect and tightening effect (or tightening effect) of the tree wrapping cloth.
In practical application, at least one of the plurality of the fastening tapes is positioned at the upper part of the tree wrapping cloth, and at least one of the fastening tapes is positioned at the lower part of the tree wrapping cloth, so that the upper part and the lower part of the tree wrapping cloth can be effectively fixed and tightened, when the plurality of transverse metal sheets are arranged, the fastening tapes can be fixed together with the transverse metal sheets at corresponding positions (for example, in a manner of direct bonding, a clamping and fixing part consisting of rivets, metal plates and bolts and the like), so that acting force can be distributed at each position through the corresponding metal sheets, and the phenomenon that the tree wrapping cloth at the position connected with the fastening tapes is torn after long-term use is avoided. For example, the number of the sticky buckle belts is three, wherein, one is located wrap up the upper portion of tree cloth, one is located wrap up the middle part of tree cloth, one is located wrap up the lower part of tree cloth, be located upper the sticky buckle belt with the interval between the topside of wrap up the tree cloth with be located the lower the sticky buckle belt with the interval between the base of wrap up the tree cloth is the same, be located upper the sticky buckle belt with be located the middle part the interval between the sticky buckle belt with be located the middle the sticky buckle belt with be located the lower the interval between the sticky buckle belt is the same, will be located the stiff end of the bonding belt on upper and be located the horizontal metal sheet fixed connection on upper, will be located the stiff end of the bonding belt of lower part and be located the horizontal metal sheet fixed connection of lower part, will be located the stiff end of the bonding belt in middle part and be located the horizontal metal sheet fixed connection of middle part.
The length of the fastening tape is preferably longer than that of the top edge of the tree wrapping cloth, namely the length of the tree wrapping cloth which can be effectively bound on a trunk is ensured, so that when the tree wrapping cloth which is wrapped on the trunk is tightened through the fastening tape, the fastening tape can transversely bypass all the tree wrapping cloth, the tightening effect can be improved, and the end to end overlapping and bonding of the fastening tape are facilitated.
The right side edge of the tree wrapping cloth is preferably and fixedly provided with a positioning rod 4, the positioning rod is parallel to the side edge of the tree wrapping cloth, the lower end of the positioning rod extends downwards out of the bottom edge of the tree wrapping cloth, and the bottom end of the positioning rod is a tip end. The positioning rod is used for positioning the tree wrapping cloth when the tree wrapping cloth is wrapped on the trunk, before the tree wrapping cloth is wrapped on the trunk, the positioning rod is firstly tightly attached to the soil of the trunk, which is vertically inserted into the root of the tree, the right side edge of the tree wrapping cloth is tightly attached to the surface of the trunk, and then the tree wrapping cloth is wrapped on the trunk, so that the tree wrapping cloth can not slide or fall off along the surface of the trunk even if the pulling force applied to the tree wrapping cloth in the wrapping process is too large (within the normal pulling force range of the manual winding of the tree wrapping cloth), the wrapping construction of the tree wrapping cloth on the trunk can be rapidly completed, the wrapping tightness of the tree wrapping cloth on the trunk can be improved, and the cold-proof heat preservation effect can be improved.
The top end of the positioning rod is preferably flush with the top edge of the tree wrapping cloth or a head is exposed from the top edge of the tree wrapping cloth (so that the lower end of the positioning rod is conveniently inserted into soil by knocking the positioning rod head exposed from the top edge of the tree wrapping cloth), and therefore when the tree wrapping cloth is wrapped on a trunk, the positioning effect on the right side edge of the tree wrapping cloth is improved.
The positioning rod can adopt a bamboo stick or an iron chisel, preferably adopts a bamboo stick, and is light in weight and low in cost.
The fixing mode of the positioning rod on the right side edge of the tree wrapping cloth can be as follows: and winding the right side edge of the tree wrapping cloth on the positioning rod, and binding and fixing the tree wrapping cloth and the positioning rod through a rope or a thin iron wire penetrating through the tree wrapping cloth. In order to improve the fixing effect between the positioning rod and the positioning rod, a plurality of annular grooves can be formed in the outer wall of the positioning rod at intervals along the axial direction, and ropes or thin iron wires are bound in the annular grooves.
The bottom edge of the tree wrapping cloth can be uniformly provided with a plurality of short drill rods 6, the short drill rods can be connected to the outer side surface of the tree wrapping cloth, for example, the short drill rods can be fixed on the outer side surface of the tree wrapping cloth in a bonding, sewing, metal wire binding, metal plate clamping and other modes, and sleeves or rings for inserting the short drill rods can be fixed on the outer side surface of the tree wrapping cloth, so that the short drill rods can be inserted into the ground, particularly in a region with large wind, and the tree wrapping cloth can be fixed.
The short brazing filler metal can be fixedly connected with the vertical metal strips of the corresponding parts, for example, the short brazing filler metal is clamped together through rivets or metal plates, so that the acting force of the short brazing filler metal is dispersed to all parts of the tree wrapping cloth through the vertical metal sheets, and the phenomenon that the tree wrapping cloth at the connecting part of the short brazing filler metal is torn due to the concentrated acting force is avoided.
Referring to fig. 4, the tree wrapping cloth preferably comprises a non-woven fabric layer 11, a cotton fabric layer 12 and a canvas layer 13 in sequence from inside to outside, and the non-woven fabric layer, the cotton fabric layer and the canvas layer are sewn or bonded into a whole. The non-woven fabric layer is mainly used for ensuring the affinity between the tree wrapping cloth and the surface of a trunk, ensuring that the tree is not damaged when the tree wrapping cloth is wrapped on the trunk for a long time in a cold season, and has certain heat preservation capability. The cotton cloth layer is mainly used for cold prevention and heat preservation. The canvas layer is mainly used for improving the toughness and the structural strength of the tree wrapping cloth, so that the tree wrapping cloth is not easy to damage under the action of external force and in severe weather environments, and is favorable for recycling and reusing.
The thickness of the non-woven fabric layer is preferably 1-2mm, so that the non-woven fabric layer is not easy to damage under the condition that the fastening tape is tightened. The thickness of the cotton cloth layer is preferably 2-5mm, so that the cold-proof and heat-preservation effects are guaranteed. The thickness of the canvas layer is 0.5-1mm, so that the overall toughness and structural strength of the tree wrapping cloth are guaranteed.
The length of the side edge of the tree wrap cloth is preferably 50-180cm, so that the main trunk of most trees (trees with different breast diameters) can be wrapped for cold protection through one cold-proof shielding device (generally, the tree wrap mode is to wrap the trunk part which is 50-180cm upwards from the ground surface where the trees are planted). The lengths of the top edge and the bottom edge of the tree wrapping cloth can be flexibly adjusted according to the variety of trees needing cold protection in a construction area and the breast diameter of a trunk. In practical application, if necessary, two or more cold-proof shielding devices can be wrapped on the trunk in sequence from bottom to top, at this time, the top end of the positioning rod can be provided with a downward groove along the axial direction, and the bottom ends of the positioning rods of the other cold-proof shielding devices except the cold-proof shielding device positioned at the lowest part can be inserted into the grooves at the top ends of the positioning rods of the cold-proof shielding devices positioned below the positioning rods, so as to realize positioning.
The utility model discloses operation method when using does: firstly, the positioning rod is vertically tightly attached to a trunk and inserted into soil at the root of a tree, then the tree wrapping cloth is wrapped on the trunk along the circumferential direction of the trunk, the metal sheet is bent and deformed in the wrapping process, the tree wrapping cloth is preliminarily fixed on the trunk, and finally the thread gluing belt is tightened and adhered along the circumferential direction of the trunk to complete the final fixation of the tree wrapping cloth on the trunk. When needs will the utility model discloses when pulling down from the trunk, reverse operation above-mentioned step can.
The preferred and optional technical means disclosed in the present invention can be combined arbitrarily to form a plurality of different technical solutions, except for the specific description and the further limitation that one preferred or optional technical means is another technical means.
Claims (10)
1. The utility model provides a afforestation plant winter protection shelters from device, its characterized in that is including wrapping up in tree cloth, foil and thread gluing area, it is the rectangle to wrap up in tree cloth, foil is rectangular shape, fixes locating wrap up in the lateral surface of tree cloth or the intermediate layer of wrapping up in tree cloth, including horizontal foil and/or vertical foil, horizontal foil's extending direction with it is parallel to wrap up in the topside of tree cloth, vertical foil's extending direction with the topside of wrapping up in tree cloth is perpendicular, the thread gluing area one end with wrap up in a side fixed connection of tree cloth, the thread gluing area with the topside of wrapping up in tree cloth is parallel.
2. An afforestation plant cold-proof shelter as claimed in claim 1, wherein the transverse metal sheet has the same length as the top edge of the tree wrap, and both ends of the transverse metal sheet are flush with the corresponding side edges of the tree wrap, respectively, and the vertical metal sheet has the same length as the side edges of the tree wrap, and both ends of the vertical metal sheet are flush with the top edge and the bottom edge of the tree wrap, respectively.
3. An afforestation plant cold-proof shelter as claimed in claim 1, wherein the number of the transverse metal sheets is several, several of the metal sheets are arranged at intervals along the up and down direction of the tree wrapping cloth, the number of the vertical metal sheets is several, and several of the vertical metal sheets are arranged at intervals along the left and right direction of the tree wrapping cloth.
4. The landscaping plant cold-proof shade device as claimed in claim 1, wherein the number of the fastening tapes is several, and several fastening tapes are distributed at intervals along the up-down direction of the tree wrapping cloth.
5. An afforestation plant cold-proof covering device as defined in claim 1, wherein the thickness of said metal sheet is 0.2-0.5 mm.
6. The landscaping plant cold-proof shelter as claimed in claim 1, wherein a positioning rod is fixed on the other side of the tree wrap opposite to the side provided with the fastening tape, the positioning rod is parallel to the side of the tree wrap, the lower end of the positioning rod extends downwards to the bottom edge of the tree wrap, and the bottom end of the positioning rod is a tip.
7. An afforestation plant cold-proof covering device as defined in claim 6, wherein the top end of the positioning rod is flush with the top edge of the tree wrapping cloth.
8. The landscaping plant cold-proof shade device as defined in claim 1, wherein the tree wrap sequentially comprises a non-woven fabric layer, a cotton fabric layer and a canvas layer from inside to outside, and the non-woven fabric layer, the cotton fabric layer and the canvas layer are sewn or bonded together.
9. An afforestation plant cold-proof shelter as claimed in claim 8, wherein the thickness of the non-woven fabric layer is 1-2mm, the thickness of the cotton fabric layer is 2-5mm, and the thickness of the canvas layer is 0.5-1 mm.
10. An afforestation plant cold-proof shielding device as defined in claim 1, wherein the side edge of the tree wrapping cloth is 50-180cm long.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220701371.2U CN217217637U (en) | 2022-03-29 | 2022-03-29 | Afforestation plant winter protection shelters from device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220701371.2U CN217217637U (en) | 2022-03-29 | 2022-03-29 | Afforestation plant winter protection shelters from device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217217637U true CN217217637U (en) | 2022-08-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220701371.2U Active CN217217637U (en) | 2022-03-29 | 2022-03-29 | Afforestation plant winter protection shelters from device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217217637U (en) |
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2022
- 2022-03-29 CN CN202220701371.2U patent/CN217217637U/en active Active
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