CN112021053A

CN112021053A - Spontaneous heating type municipal administration trunk protection is with freezing crack prevention sheath

Info

Publication number: CN112021053A
Application number: CN202010958791.4A
Authority: CN
Inventors: 雷榕
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-09-14
Filing date: 2020-09-14
Publication date: 2020-12-04

Abstract

The invention discloses a self-heating type anti-frost-crack sheath for protecting a municipal trunk, which belongs to the technical field of municipal tree protection, and effectively improves the anti-freezing protection of the main trunk and the root of a tree by arranging a trunk sheath, a root sheath and a cold-proof film, wherein an oxidation heating layer is embedded on a heat storage layer, a plurality of air vents are arranged on an outer cold-proof layer, a heating expansion body is embedded in the air vents, the heating expansion body is in a non-expansion state due to lower temperature at night, pores are formed between the heating expansion body and the inner walls of the air vents, external air is diffused inwards through the pores and is contacted with the oxidation heating layer, the oxidation heating layer heats and improves the overall temperature of the sheath so as to realize heat supply and cold defense for the tree, when the temperature rises in the day, the heating expansion body gradually expands to fill the whole air vent cavity, hole closing treatment is realized, and the energy consumption caused by the oxidation heating, therefore, the temperature control circulation in the day and at night is carried out, and the cold resistance effect on the trees is effectively improved.

Description

Spontaneous heating type municipal administration trunk protection is with freezing crack prevention sheath

Technical Field

The invention relates to the technical field of municipal tree protection, in particular to a spontaneous-heating type frost crack prevention sheath for municipal trunk protection.

Background

In order to strengthen the development of municipal road greening, the protection of trees is particularly important, the tree trunk is an important component of the tree, the tree trunk is easily frozen in winter, particularly in northern areas of China, the tree trunk is cold and dry and windy in winter, some less cold-resistant tree species can be frozen in winter to early spring, the day and night temperature difference in winter is large, the temperature rises when the tree trunk is irradiated by sunlight in the daytime, the tree trunk is dark brown and is easy to absorb heat, the temperature of the tree trunk also rises quickly, the temperature is low at night, and the tree trunk is more easily frozen and cracked when the tree trunk is cold and hot. Especially, big trees have thick trunks, deep colors and poor tissue toughness, and are easy to crack.

In order to make trees live through the winter safely, management departments can take many necessary measures. For example, the trunk is painted white, or straw or sponge, cloth, etc. are used to wrap the trunk and part of the main branches to prevent cold. The trunk whitewash is mostly made of chemical substances at present, is unfavorable for the growth of the tree, pollutes the environment and wastes resources, and is not an environment-friendly solution; although the binding type protection of the straws, the sponges, the cloth and the like is simple to operate, the cold-proof performance of the binding type protection is still to be improved, and the straws, the sponges, the cloth and the like are easily affected by the natural environment, so that the binding type protection is easy to rot and crack in the open air for a long time, the service life of the binding type protection is short, and the trunk is difficult to have a long cold-proof effect.

Therefore, the self-heating municipal trunk protection anti-frost-crack sheath is provided to effectively solve some problems in the prior art.

Disclosure of Invention

1. Technical problem to be solved

Aiming at the problems in the prior art, the invention aims to provide a self-heating type municipal trunk protection anti-freezing crack sheath, which effectively improves the anti-freezing protection of the main trunk and the root of a tree by arranging a trunk sheath, a root sheath and a cold-proof film, wherein an oxidation heating layer is embedded on a heat storage layer, a plurality of air holes are arranged on an outer cold-proof layer, a heating expansion body is embedded in the air holes, the heating expansion body is in a non-expansion state due to lower temperature at night, pores are formed between the heating expansion body and the inner wall of the air holes, outside air is diffused inwards through the pores and is contacted with the oxidation heating layer, the oxidation heating layer heats and improves the whole temperature of the sheath so as to supply heat to the tree and resist cold, when the temperature rises in the day, the heating expansion body gradually expands to fill the whole air holes, hole closing treatment is realized, and the energy consumption caused by the fact that the oxidation heating layer contacts the air is, therefore, the temperature control circulation in the day and at night is carried out, and the cold resistance effect on the trees is effectively improved.

2. Technical scheme

In order to solve the above problems, the present invention adopts the following technical solutions.

A self-heating municipal trunk protection anti-frost crack sheath comprises a root sheath and a main sheath positioned at the top end of the root sheath, wherein a cold-proof film is fixedly connected to the bottom end face of the root sheath, the main sheath comprises an outer cold-proof layer, a heat storage layer and an inner heat insulation layer which are sequentially coated from outside to inside, the outer cold-proof layer comprises a closed pore sponge sleeve positioned on the inner side, the upper end and the lower end of the closed pore sponge sleeve are fixedly connected with a reinforcing sleeve, a plurality of air holes are formed in the closed pore sponge sleeve, a heat-receiving expansion body is connected to the air holes, holes are formed between the heat-receiving expansion body and the air holes, a waterproof light-transmitting layer is coated on the outer side wall of the closed pore sponge sleeve, the heat storage layer comprises a heat-conducting sheath sleeved inside the closed pore sponge sleeve, and a plurality of heating cavities are formed in one end face of the heat, the inner end face of the heating cavity is provided with a breathable layer, the heating cavity is internally embedded with an oxidation heating layer, the outer side of the oxidation heating layer is coated with the breathable layer, the breathable layer is attached to the inner wall of the closed-pore sponge sleeve, the inner heat-insulating layer comprises an activated carbon fiber layer which is attached to and coated on the inner wall of the heat-conducting sheath, and a flexible sponge layer is attached to the inside of the activated carbon fiber layer.

Further, root sheath and trunk sheath all adopt about to carry out fixed connection, it is a pair of the both sides all are equipped with mutual butt joint's linking strip around outer cold-resistant layer, it is a pair of heat accumulation layer's upper end both sides all are equipped with mutual butt joint's linking piece, and correspond a pair of linking strip that sets up, link up the piece and all connect through locking screw, adopt semi-open butt joint method, easily locate the outside of trunk with the synthetic whole cover of root sheath and trunk sheath, and the straight length of root sheath and trunk sheath sets up according to actual conditions, and outer cold-resistant layer and heat accumulation layer stand alone type respectively fixedly, easily independent split.

Further, the heated expansion body comprises an elastic closed bag which is embedded and connected with the inside of the air vent, ammonium chloride powder is filled in the elastic closed bag, the outer edge of the elastic closed bag is connected with the inner wall of the air vent through a plurality of connecting fibers, the temperature is lower at night, the elastic closed bag is in a non-expansion state, at the moment, a hole is formed between the elastic closed bag and the inner wall of the air vent, outside air is diffused outwards through the hole and is contacted with the oxidation heating layer, so that the oxidation heating layer generates heat and conducts the heat inwards, heat supply to the trunk at night is realized, when the heated elastic closed bag is irradiated by sunlight in the daytime, the temperature rises, the sunlight irradiates the closed sponge sleeve through the waterproof euphotic layer, after the closed sponge sleeve is heated, the ammonium chloride powder in the elastic closed bag is heated and decomposed into gas, and when the gas quantity is increased, the ammonium chloride powder is gradually expanded to fill the whole euphotic cavity, and the closed hole treatment is realized, and the oxidation heating layer does not contact air to generate heat at the moment, so that energy is stored.

Furthermore, a plurality of heat-absorbing layers corresponding to the elastic closed bags are embedded in the outer side wall of the closed-cell sponge sleeve, the heat-absorbing layers are embedded in the outer side of the elastic closed bags, and the heat-absorbing layers are beneficial to absorbing heat around the elastic closed bags so as to enable the elastic closed bags to expand when heated and to be closed more quickly.

Furthermore, the oxidation generates heat the layer including inlaying the carbon fiber layer of locating the intracavity portion that generates heat, fixed the attaching has the multiunit from the heat-generating body on the lateral wall on carbon fiber layer.

Further, the spontaneous heating body is including inlaying the heat conduction fiber strip of locating on the carbon fiber layer, the cover is equipped with a plurality of ventilative heat generating bags on the heat conduction fiber strip, the inside packing of ventilative heat generating bag has spontaneous heating material, spontaneous heating material is the reducing iron powder, and the carbon fiber layer is ventilative utricule, when its periphery leaves gas, reducing iron powder can produce the heat with oxygen reaction immediately, improves the heat of this sheath in the lower evening of temperature to play cold-resistant, frost crack resistance to the trunk.

Further, it has a plurality of silica gel heat conduction posts to distribute annularly on the inner wall of heat conduction sheath, set up on the lateral wall on activated carbon fiber layer a plurality ofly with silica gel heat conduction post assorted inlay establish the groove, silica gel heat conduction post establishes the cooperation with inlaying of establishing the groove, is favorable to on the one hand the heat accumulation layer and interior heat preservation between stable the inlaying establish, and on the other hand is favorable to will following the heat inward conduction that ventilative heat bag department produced.

Furthermore, a plurality of embedding strips are annularly arranged at the bottom end of the root sheath, the cold-proof film is coated outside the plurality of embedding strips, and the plurality of embedding strips are fixedly connected with the ground through expansion screws.

Furthermore, the top of trunk sheath is equipped with the buckler, the bonding seam has been seted up on the buckler, bonding seam department is through tie coat looks fixed connection, effectively avoids the leading-in trunk sheath department of natural rainwater.

3. Advantageous effects

Compared with the prior art, the invention has the advantages that:

(1) through arranging the trunk sheath, the root sheath and the cold-proof film, the anti-freezing protection of the main trunk and the root of the tree is effectively improved, the heat storage layer is embedded with the oxidation heating layer, the outer cold-proof layer is provided with a plurality of air holes, the air holes are embedded with the heated expansion body, at night, the temperature is lower, the heated expansion body is in a non-expansion state and has holes with the inner wall of the air holes, outside air is diffused inwards through the holes and is in contact with the oxidation heating layer, the oxidation heating layer generates heat and improves the whole temperature of the sheath, so as to realize the heat supply and cold resistance of the tree, when the temperature rises in the daytime, the heated expansion body gradually expands to fill the whole air permeable cavity, realize closed hole treatment, effectively avoid the oxidation heating layer from contacting the air and generating heat to consume energy, thereby the temperature control circulation in the daytime and at night is carried out, and the cold-proof, compared with the using effect of the prior straw and the like, the sheath has better using performance and longer service life.

(2) Root sheath and trunk sheath all adopt about the dock carry out fixed connection, both sides all are equipped with mutual butt joint's linking strip around a pair of outer cold-resistant layer, the upper end both sides on a pair of heat accumulation layer all are equipped with mutual butt joint's linking piece, and correspond a pair of linking strip that sets up, linking piece all connects through locking screw, adopt semi-open butt joint method, easily locate the outside of trunk with the synthetic whole cover of root sheath and trunk sheath, the straight length of root sheath and trunk sheath sets up according to actual conditions, and outer cold-resistant layer and heat accumulation layer stand alone type respectively fixedly, easily independent split.

(3) The heated expansion body comprises an elastic closed bag which is embedded and connected with the inside of the air vent, the inside of the elastic closed bag is filled with ammonium chloride powder, the outer edge of the elastic closed bag is connected with the inner wall of the air vent through a plurality of connecting fibers, at night, because the temperature is lower, the elastic closed bag is in a non-expansion state, at the moment, a hole is formed between the elastic closed bag and the inner wall of the air vent, outside air diffuses outwards through the hole and is contacted with an oxidation heating layer, so that the oxidation heating layer generates heat and conducts the heat inwards, thereby realizing the heat supply to a trunk at night, when the trunk is irradiated by sunlight in the daytime, the temperature rises, the sunlight irradiates on the closed hole sponge sleeve through the waterproof layer, after the closed hole sponge sleeve is heated, the ammonium chloride powder inside the elastic closed bag is heated and decomposed into gas, and when the gas quantity is increased, the ammonium chloride powder gradually expands, and the closed hole treatment is realized, and the oxidation heating layer does not contact air to generate heat at the moment, so that energy is stored.

(4) The outer side wall of the closed cell sponge sleeve is embedded with a plurality of heat-absorbing layers corresponding to the elastic closed cells in position, the heat-absorbing layers are embedded in the outer side of the elastic closed cells, and the heat-absorbing layers are arranged to facilitate heat absorption around the elastic closed cells so as to enable the elastic closed cells to be heated and expanded to be closed more quickly.

(5) The oxidation generates heat the layer including inlaying the carbon fiber layer of locating the intracavity portion that generates heat, fixed the attaching has the multiunit from the heat-generating body on the lateral wall of carbon fiber layer, from the heat-generating body including inlaying the heat conduction fiber strip of locating on the carbon fiber layer, the cover is equipped with a plurality of ventilative heat-generating bags on the heat conduction fiber strip, the inside packing of ventilative heat-generating bag has self-heating material, self-heating material is the reducing iron powder, the carbon fiber layer is ventilative utricule, when its periphery has gas, reducing iron powder can produce the fever with oxygen reaction immediately, improve the heat of this sheath in the lower evening of temperature, thereby play cold-resistance to the trunk, the frost crack prevention effect.

(6) The annular distributes on the inner wall of heat conduction sheath has a plurality of silica gel heat conduction posts, set up on the lateral wall on activated carbon fiber layer a plurality ofly with silica gel heat conduction post assorted inlay establish the groove, silica gel heat conduction post with inlay establish the groove inlay establish the cooperation, be favorable to on the one hand heat accumulation layer and interior heat preservation between stable inlay establish, on the other hand is favorable to will following the heat inward conduction that ventilative heat bag department produced.

(7) Root sheath's bottom annular is equipped with a plurality of inlays and establishes the strip, and the winter protection film cladding establishes the strip outside in a plurality of inlays, and a plurality of inlays and establishes the strip and pass through inflation screw and ground looks fixed connection, and the top of trunk sheath is equipped with the buckler, has seted up the bonding seam on the buckler, and bonding seam department effectively avoids the leading-in trunk sheath department of natural rainwater through tie coat looks fixed connection.

Drawings

FIG. 1 is a perspective view of the present invention mounted on a tree;

FIG. 2 is a perspective view of the trunk sheath of the present invention;

FIG. 3 is a partial perspective view of the outer cold-resistant layer, the heat storage layer and the inner insulating layer of the present invention after being installed;

FIG. 4 is a perspective view of the present invention with the outer cold-resistant layer, the heat storage layer, and the inner insulating layer separated;

FIG. 5 is a cross-sectional view of the outer cold-resistant layer of the present invention;

FIG. 6 is a partially exploded perspective view of the heat storage layer of the present invention;

fig. 7 is a partial perspective view of the oxidation heat generation layer of the present invention.

The reference numbers in the figures illustrate:

1 root sheath, 2 winter protection films, 3 trunk sheaths, 4 outer cold-resistant layers, 401 closed-cell sponge sleeves, 4011 elastic closed bags, 4012 ammonium chloride powder, 4013 heat absorption layers, 402 reinforcing sleeves, 403 waterproof light-transmitting layers, 5 heat storage layers, 501 heat-conducting sheaths, 502 silica gel heat-conducting columns, 503 heat-generating cavities, 504 oxidation heat-generating layers, 5041 carbon fiber layers, 5042 heat-conducting fiber strips, 5043 breathable heat-generating bags, 505 breathable layers, 6 inner heat-insulating layers, 601 activated carbon fiber layers, 602 flexible sponge layers and 7 waterproof covers.

Detailed Description

The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; but not all embodiments, are based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1:

referring to fig. 1-2, a self-heating type municipal trunk protection anti-frost crack sheath comprises a root sheath 1 and a trunk sheath 3 positioned at the top end of the root sheath 1, the bottom end face of the root sheath 1 is fixedly connected with a cold-proof film 2, the trunk sheath 3 comprises an outer cold-resistant layer 4, a heat storage layer 5 and an inner heat preservation layer 6 which are sequentially coated from outside to inside, the root sheath 1 and the trunk sheath 3 are fixedly connected in a left-right butt joint manner, the front side and the rear side of a pair of outer cold-resistant layers 4 are respectively provided with a connecting strip which are mutually in butt joint, the two sides of the upper end of a pair of heat storage layers 5 are respectively provided with a connecting block which are mutually in butt joint, the pair of corresponding connecting strips and connecting blocks are connected through locking screws, the root sheath 1 and the trunk sheath 3 are easily integrally sleeved outside the trunk by adopting a semi-open butt joint method, and the radial lengths of the root sheath 1 and the trunk sheath, and outer cold-resistant layer 4 and heat accumulation layer 5 stand alone type respectively fixedly, easily independent split, need supply here, root sheath 1's bottom annular is equipped with a plurality of and inlays and establish the strip, 2 cladding of winter protection film are outside in a plurality of inlays and establish the strip, and a plurality of inlays and establish the strip and pass through inflation screw and ground looks fixed connection, trunk sheath 3's top is equipped with buckler 7, the bonding seam has been seted up on the buckler 7, bonding seam department passes through bonding layer looks fixed connection, effectively avoid leading-in trunk sheath 3 department of natural rainwater.

Referring to fig. 3-6, the outer cold-resistant layer 4 includes a closed-cell sponge sleeve 401 located at the inner side, the upper and lower ends of the closed-cell sponge sleeve 401 are fixedly connected with a reinforcing sleeve 402, the closed-cell sponge sleeve 401 is provided with a plurality of air vents, the plurality of air vents are connected with thermal expansion bodies, pores are reserved between the thermal expansion bodies and the air vents, the outer side wall of the closed-cell sponge sleeve 401 is wrapped with a waterproof euphotic layer 403, the waterproof euphotic layer 403 has air permeability and is used for air circulation, the heat storage layer 5 includes a heat-conducting sheath 501 sleeved inside the closed-cell sponge sleeve 401, one end face of the heat-conducting sheath 501 connected with the closed-cell sponge sleeve 401 is provided with a plurality of heating cavities 503, the inner end face of the heating cavities 503 is provided with an air-permeable layer, an oxidation heating layer 504 is embedded inside the heating cavities 503, the outer side of the oxidation heating layer 504 is wrapped, interior heat preservation 6 is including pasting activated carbon fiber layer 601 of cladding on heat conduction sheath 501 inner wall, activated carbon fiber layer 601's inside is pasted and is had flexible sponge layer 602, be full of whole bleeder vent after the thermal expansion body is heated to expand, realize the sealing of bleeder vent, when the hole is left to low temperature, be used for gaseous circulation, when low temperature at night, the air enters into oxidation heating layer 504 department through the hole between the thermal expansion body and the bleeder vent, oxidation heating layer 504 contact air oxidation generates heat, provide the heat and resist the frost for the trunk.

Referring to fig. 5, specifically, the heated expansion body includes an elastic sealing bag 4011 embedded inside the air vent, ammonium chloride powder 4012 is filled inside the elastic sealing bag 4011, the outer edge of the elastic sealing bag 4011 is connected with the inner wall of the air vent through a plurality of connecting fibers, at night, because the temperature is low, the elastic sealing bag 4011 is in a non-expansion state, at this time, a pore exists between the elastic sealing bag 4011 and the inner wall of the air vent, outside air diffuses outwards through the pore and contacts with the oxidation heat generation layer 504, so that the oxidation heat generation layer 504 generates heat and conducts the heat inwards, so as to supply heat to the trunk at night, when the trunk is irradiated by sunlight in the daytime, the temperature rises, the sunlight irradiates the closed-pore sponge sleeve 401 through the waterproof light transmission layer 403, after the closed-pore sponge sleeve 401 is heated, the ammonium chloride powder 4012 inside the elastic sealing bag 4011 is heated and decomposed into gas, and when the gas quantity increases, the ammonium chloride powder 4012 gradually expands to fill the whole air transmission cavity, realize the obturator and handle, and oxidation heating layer 504 does not contact the air and does not generate heat this moment, the stored energy, in addition, inlay on the lateral wall of obturator sponge cover 401 and be equipped with a plurality of heat-absorbing layers 4013 that correspond with elasticity airtight bag 4011 position, heat-absorbing layer 4013 inlays and locates elasticity airtight bag 4011's outside department, heat-absorbing layer 4013 is provided with and does benefit to around the elasticity airtight bag 4011 and absorb heat to make elasticity airtight bag 4011 be heated the inflation more quickly and realize the obturator.

Referring to fig. 6-7, the oxidative heating layer 504 includes a carbon fiber layer 5041 embedded inside the heating cavity 503, a plurality of sets of self-heating bodies are fixedly attached to the outer side wall of the carbon fiber layer 5041, each self-heating body includes a heat conducting fiber strip 5042 embedded on the carbon fiber layer 5041, a plurality of breathable heating bags 5043 are sleeved on the heat conducting fiber strip 5042, a self-heating material is filled inside each breathable heating bag 5043, the self-heating material is reducing iron powder, the carbon fiber layer 5041 is a breathable bag body, when gas is left around the self-heating body, the reducing iron powder can immediately react with oxygen to generate heat, the heat of the sheath is increased at night when the temperature is low, and therefore the cold resistance and the frost crack resistance of the trunk are achieved.

Referring to fig. 4, a plurality of silica gel heat conducting pillars 502 are annularly distributed on the inner wall of the heat conducting sheath 501, a plurality of embedding grooves matched with the silica gel heat conducting pillars 502 are formed on the outer side wall of the activated carbon fiber layer 601, and the silica gel heat conducting pillars 502 are matched with the embedding grooves in an embedding manner, so that on one hand, stable embedding between the heat storage layer 5 and the inner heat insulation layer 6 is facilitated, and on the other hand, heat generated from the breathable heat generating bag 5043 is conducted inwards.

The main trunk sheath 3, the root sheath 1 and the cold-proof film 2 are arranged at the trunk and the root, so that the anti-freezing protection of the main trunk and the root of the tree is effectively improved, the trunk sheath 3 comprises an outer cold-resistant layer 4, a heat storage layer 5 and an inner heat insulation layer 6 which are sequentially distributed from outside to inside, a plurality of groups of oxidation heating layers 504 are embedded and installed on the heat storage layer 5, a plurality of air holes are formed in the outer cold-resistant layer 4, and heated expansion bodies are embedded and installed in the air holes, so that at night, due to the lower temperature, the heated expansion bodies are in a non-expansion state, and pores are formed between the heated expansion bodies and the inner wall of the air holes, outside air is diffused inwards through the pores and is contacted with the oxidation heating layers 504, so that the oxidation heating layers 504 generate heat, the heat is conducted inwards through the inner heat insulation layer 6, the whole temperature of the sheath is improved, and, when the sheath is irradiated by sunlight in the daytime, the temperature rises, the heated expansion body gradually expands to fill the whole ventilating cavity, the closed hole treatment is realized, the oxidized heating layer 504 is effectively prevented from contacting the air and generating heat to consume energy, so that the temperature control circulation in the daytime and at night is carried out, the cold resistance effect on trees is effectively improved, and the service life of the sheath is also prolonged relative to the service life of the existing straws and the like.

The components used in the present invention are all standard components or components known to those skilled in the art, and the structure and principle thereof can be known to those skilled in the art through technical manuals or through routine experiments.

The above; but are merely preferred embodiments of the invention; the scope of the invention is not limited thereto; any person skilled in the art is within the technical scope of the present disclosure; the technical scheme and the improved concept of the invention are equally replaced or changed; are intended to be covered by the scope of the present invention.

Claims

1. The utility model provides a spontaneous heating type municipal administration trunk protection is with freezing crack prevention sheath, includes root sheath (1) and trunk sheath (3) that are located root sheath (1) top, its characterized in that: the root sheath (1) is fixedly connected with a cold-proof film (2) on the bottom end face, the main sheath (3) comprises an outer cold-resistant layer (4), a heat storage layer (5) and an inner heat insulation layer (6) which are sequentially coated from outside to inside, the outer cold-resistant layer (4) comprises a closed pore sponge sleeve (401) positioned on the inner side, reinforcing sleeves (402) are fixedly connected with the upper end and the lower end of the closed pore sponge sleeve (401), a plurality of air holes are formed in the closed pore sponge sleeve (401), heated expansion bodies are connected with the air holes, holes are formed between the heated expansion bodies and the air holes, a waterproof light transmission layer (403) is wrapped on the outer side wall of the closed pore sponge sleeve (401), the heat storage layer (5) comprises a heat conduction sheath (501) sleeved inside the closed pore sponge sleeve (401), and a plurality of heating cavities (503) are formed in one end face, where the heat conduction sheath (501) and the closed pore sponge sleeve (401) are mutually connected, the inner end face of the heating cavity (503) is provided with a breathable layer, the heating cavity (503) is internally embedded with an oxidation heating layer (504), the outer side of the oxidation heating layer (504) is coated with a breathable layer (505), the breathable layer (505) is attached to the inner wall of the closed-cell sponge sleeve (401), the inner heat-insulating layer (6) comprises an activated carbon fiber layer (601) which is coated on the inner wall of the heat-conducting sheath (501), and a flexible sponge layer (602) is attached to the inside of the activated carbon fiber layer (601).

2. The self-heating municipal trunk protection frost crack prevention sheath of claim 1, characterized in that: root sheath (1) and trunk sheath (3) all adopt about to carry out fixed connection, it is a pair of both sides all are equipped with mutual butt joint's linking strip around outer cold-resistant layer (4), and are a pair of the upper end both sides of heat accumulation layer (5) all are equipped with mutual butt joint's linking piece, and correspond a pair of linking strip that sets up, link up the piece and all connect through locking screw.

3. The self-heating municipal trunk protection frost crack prevention sheath of claim 1, characterized in that: the heating expansion body is connected in the inside elasticity airtight bag (4011) of bleeder vent including inlaying, elasticity airtight bag (4011) inside is filled with ammonium chloride powder (4012), the outward flange of elasticity airtight bag (4011) is connected with the venthole inner wall through a plurality of connecting fiber.

4. The self-heating municipal trunk protection frost crack prevention sheath of claim 3, characterized in that: the outer side wall of the closed cell sponge sleeve (401) is embedded with a plurality of heat absorbing layers (4013) corresponding to the elastic closed bag (4011), and the heat absorbing layers (4013) are embedded in the outer side of the elastic closed bag (4011).

5. The self-heating municipal trunk protection frost crack prevention sheath of claim 1, characterized in that: the oxidation heating layer (504) comprises a carbon fiber layer (5041) which is embedded in the heating cavity (503), and a plurality of groups of self-heating bodies are fixedly attached to the outer side wall of the carbon fiber layer (5041).

6. The self-heating municipal trunk protection frost crack prevention sheath of claim 5, wherein: the spontaneous heating body is including inlaying heat conduction fiber strip (5042) on carbon fiber layer (5041), the cover is equipped with a plurality of ventilative heat cells (5043) on heat conduction fiber strip (5042), the inside packing of ventilative heat cell (5043) has spontaneous heating material, spontaneous heating material is reducing iron powder.

7. The self-heating municipal trunk protection frost crack prevention sheath of claim 1, characterized in that: a plurality of silica gel heat conduction columns (502) are annularly distributed on the inner wall of the heat conduction sheath (501), and a plurality of embedding grooves matched with the silica gel heat conduction columns (502) are formed in the outer side wall of the activated carbon fiber layer (601).

8. The self-heating municipal trunk protection frost crack prevention sheath of claim 1, characterized in that: the root sheath (1) is provided with a plurality of embedded strips at the bottom end in an annular manner, the cold-proof film (2) is coated outside the embedded strips, and the embedded strips are fixedly connected with the ground through expansion screws.

9. The self-heating municipal trunk protection frost crack prevention sheath of claim 1, characterized in that: the top of trunk sheath (3) is equipped with buckler (7), set up bonding seam on buckler (7), bonding seam department is through tie coat looks fixed connection.