CN209715783U - It repairs and scrapes device - Google Patents

Abstract

The utility model is to repair to scrape device about one kind.It includes: blade and fixture that this, which is repaired and scrapes device,；Fixture is fixedly connected with blade, wherein two opposing outer faces on fixture positioned at blade two sides are smooth ramp, and the angle of the cutter head extending direction of the smooth ramp and blade is obtuse angle.The probability that the technical solution can reduce fixture outer surface and solar components collide with can reduce fixture to the damaged condition of solar components when the outer surface of fixture and solar components are collided with.

Description

It repairs and scrapes device

Technical field

It is repaired the utility model relates to field of mechanical technique more particularly to one kind and scrapes device.

Background technique

In the manufacturing process of solar components, the solar components edge by lamination can be filled there are packing material Material is not easy to remove after solidification, it usually needs scrapes device using repairing and strikes off the packing material after solidifying.

In the related technology, usually the copper fixture of band blade is mounted on to be used as to repair on other devices and scrapes device, in general, making It is repaired to scrape fixture when device strikes off the packing material and be easy to happen with solar components edge with this and be collided with, and the seamed edge on fixture It is easy to damage solar components, increases the fraction defective for repairing solar components when scraping operation.

Utility model content

It scrapes device in order to overcome to repair in the related technology when repairing and scraping packing material and is easy to collide with simultaneously with solar components The problem of being easily damaged solar components is convenient for the user to use, and the utility model embodiment, which provides one kind, repairs and scrape device.The skill Art scheme is as follows:

Device is scraped in a first aspect, providing one kind and repairing according to the utility model embodiment, comprising: blade；Fixture, and it is described Blade is fixedly connected, wherein two opposing outer faces on the fixture positioned at the blade two sides are smooth ramp, and described The angle of the cutter head extending direction of smooth ramp and the blade is obtuse angle；

In one embodiment, the obtuse angle is 120 °~165 °.

In one embodiment, described repair scrapes device further include: adherent layer, positioned at the described two relatively outer of the fixture The outer surface on surface and the blade, the adherent layer is for preventing the adherency to be repaired for scraping material.

In one embodiment, described repair scrapes device further include: heating part is connect with the fixture, for when being powered Thermal energy is generated, and the thermal energy of generation is transferred to the fixture.

In one embodiment, described repair scrapes device further include: overheating protection portion is connect, for examining with the heating part The temperature of the fixture is surveyed, and when the temperature of the fixture is more than preset temperature, controls the heating part and stops heating.

In one embodiment, the overheating protection portion includes: temperature sensor, is located on the fixture, with controller Electrical connection, for detecting the temperature of the fixture, and the temperature information that will test is sent to the controller；The control Device is connect with the heating part, and whether the temperature information for judging that the temperature sensor is sent is more than preset temperature value, and When the temperature information is more than the preset temperature value, controls the heating part and stop heating.

In one embodiment, described to repair that scrape device further include thermal insulation layer, it is coated on except the temperature sensor, For slowing down the temperature changing speed around the temperature sensor.

In one embodiment, the fixture includes holding tank, and the temperature sensor is located in the holding tank.

In one embodiment, the heating part further include: hand-held part and heat transfer part；The hand-held part, outer surface setting There is thermal insulation layer；The heat transfer part is detachably connected positioned at one end of the hand-held part, and with the fixture, for that described will add The thermal energy that hot portion generates is transferred to the fixture.

In one embodiment, the fixture includes: the first clamping part and the second clamping part, first clamping part and institute It is opposite to state the second clamping part, and is arranged between first clamping part and second clamping part and has the gap, the gap is used for Accommodate portion blade；Fixed part is detachably connected with first clamp portion and second clamp portion, is used for the part Blade is fixed between first clamping part and second clamping part.

In one embodiment, the material of the thermal insulation layer is polyvinyl butyral or silica.

Technical solution provided by the embodiment of the utility model can include the following benefits: the folder of device is scraped by that will repair Two opposing outer faces on tool positioned at blade two sides are set as with the angle of the cutter head extending direction of blade being the smooth of obtuse angle Inclined-plane can reduce fixture outer surface and probability that solar components collide with, can repair the outer surface for scraping device and too When positive energy component collides with, fixture is reduced to the damaged condition of solar components.

It should be understood that above general description and following detailed description be only it is exemplary and explanatory, not The utility model can be limited.

Detailed description of the invention

The drawings herein are incorporated into the specification and forms part of this specification, and shows and meets the utility model Embodiment, and be used to explain the principles of the present invention together with specification.

Fig. 1 is the side structure schematic view shown according to an exemplary embodiment repaired and scrape device.

Fig. 2 is the side structure schematic view shown according to an exemplary embodiment repaired and scrape device.

Fig. 3 is the positive structure diagram shown according to an exemplary embodiment repaired and scrape device.

Fig. 4 is the positive structure diagram shown according to an exemplary embodiment repaired and scrape device.

Fig. 5 is the positive structure diagram shown according to an exemplary embodiment repaired and scrape device.

Fig. 6 is the side structure schematic view shown according to an exemplary embodiment repaired and scrape device.

Fig. 7 is the positive structure diagram shown according to an exemplary embodiment repaired and scrape device.

Specific embodiment

Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment Described in embodiment do not represent all embodiments consistent with the utility model.On the contrary, they be only with such as The example of the consistent device and method of some aspects be described in detail in the appended claims, the utility model.

Technical solution provided by the embodiment of the utility model, which is related to one kind, repairs and scrapes device, and Fig. 1 is according to an exemplary implementation What is exemplified repairs the side structure schematic view for scraping device.As shown in Figure 1, repairing, to scrape device 1 include: blade 10 and fixture 20.

Fixture 20 is fixedly connected with blade 10, wherein as shown in Figure 1, being located at two phases of 10 two sides of blade on fixture 20 It is smooth ramp to outer surface, and the angle of the cutter head extending direction of the smooth ramp and blade 10 is obtuse angle, such as Fig. 1 institute Show, the extending direction of cutter head is X-direction shown in FIG. 1.

Here, as shown in Figure 1, fixture 20 is fixedly connected by clamping the portion blade of blade 10 with blade 10, blade Other parts on 10 including cutter head are emerging in outside fixture 20.Here, relatively outer positioned at two of 10 two sides of blade on fixture 20 Surface can be the identical smooth ramp of gradient, be also possible to the different smooth ramp of gradient, and the utility model is not done herein to be had Body limitation.Here, device 1 is scraped when the packing material to solar components edge repair and scraped due to repairing, outer surface 21 or outer The edge of the close solar components of the meeting of surface 22, so, two opposing outer faces that 10 two sides of blade are located on fixture 20 are equal Be set as be with the angle of the cutter head extending direction of blade 10 obtuse angle smooth inclined-plane, on the one hand can be convex to avoid outer surface The seamed edge risen is easy with solar components edge there is a situation where colliding with, on the other hand can be in fixture and solar components edge When colliding with, increase the contact area of chucking surface and solar components edge, so that the identical impact force the case where Under, mitigate fixture to the extent of damage at solar components edge.

In the present embodiment, it will repair and be located at two opposing outer faces of blade two sides on the fixture for scrape device and be set as and blade Cutter head extending direction angle be obtuse angle smooth ramp, can reduce fixture outer surface and solar components collide with Probability can reduce fixture to the damaged condition of solar components when fixture outer surface and solar components are collided with.

In one embodiment, the angle of the cutter head extending direction of the smooth ramp and blade 10 is 120 °~165 °.

In one embodiment, Fig. 2 is the side structure schematic view shown according to an exemplary embodiment repaired and scrape device.Such as Shown in Fig. 2, repairing and scraping device 1 further includes adherent layer 30, and adherent layer 30 is located at opposite positioned at two of 10 two sides of blade on fixture 20 Outer surface and the outer surface of blade 10, adherent layer 30 is for preventing the adherency to be repaired for scraping material.

Here, due to using repair scrape device repair scrape operation when, the packing material that scrapes from solar components is easy It is adhered on blade and fixture, it has not been convenient to remove, moreover, the packing material being adhered on blade and fixture holds under high temperature action It is also easy to produce pernicious gas, the health for scraping operating personnel is repaired in influence.Therefore, repair scrape on device be arranged adherent layer 30 can be square Just user of service is to repairing the cleaning for scraping device, and is conducive to the health of user of service.

Here, adherent layer 30 is at least covered on two opposing outer faces and knife for being located at 10 two sides of blade on fixture 20 On each surface of piece 10, also, as shown in Fig. 2, adherent layer 30 is smoothly covered on corresponding outer surface and two neighboring surface Between joint so that the joint of the outer surface and outer surface that are covered with adherent layer 30 keeps smooth.It is exemplary, prevent Adhesion coating 30 can be the high temperature adhesive plaster for being attached to outer surface, and be also possible to coating has anti-stick patch property, soil resistance on the outer surface With coating resistant to high temperature, such as teflon coating, Polyvinylidene Fluoride Coatings etc., the utility model at this to anti-sticking paste layer not Make specific restriction, as long as having the characteristics that the material of anti-stick patch property, soil resistance and high temperature resistant.Exemplary, adherent layer 30 is not Two opposing outer faces for being located at 10 two sides of blade on fixture 20 only can be only covered, all appearances of fixture 20 can also be covered Face, to prevent the material to be repaired scraped to be adhered to any position of fixture 20, the convenient cleaning to 20 outer surface of fixture.

In the present embodiment, two opposing outer faces of blade two sides are located on fixture, and on the outer surface of blade Adherent layer is set, can prevent from repairing the packing material scraped from solar components edge being adhered to repair and scrape on device, to avoid When heating repairs and scrapes device, the heated generation pernicious gas of the packing material scraped and adhered on device is repaired.

In one embodiment, Fig. 3 is the positive structure diagram shown according to an exemplary embodiment repaired and scrape device.Such as Shown in Fig. 3, repairing and scraping device 1 further includes heating part 40, and heating part 40 is connect with fixture 20, for generating thermal energy when being powered, and The thermal energy of generation is transferred to fixture 20.

Here, heating part 40, which can be heater strip etc., can convert electrical energy into the component of thermal energy, and the utility model is to this It is not specifically limited.Repairing and scraping device 1 can also include the plug wire portion being made of cable and plug, the plug wire portion by the cable with Heating part 40 connects, to provide electric energy as heating part 40 when plug is electrically connected to a power source.Exemplary, heating part 40 is with heat transmitting Mode the thermal energy of generation is transferred to blade 10 by fixture 20 so that the blade 10 after heating scrapes solar components repairing First the packing material after solidification can be softened when the packing material at edge, so that convenient scrape repairing for packing material.Show Example, heating part 40 can be detachably connected with fixture 20, to facilitate the replacement to fixture 20.

In the present embodiment, by scraping on device setting and can make to heat to the heating part that blade is heated repairing Blade afterwards softens cured packing material, facilitates and scrapes repairing for material to be repaired and scrape.

In one embodiment, Fig. 4 is the positive structure diagram shown according to an exemplary embodiment repaired and scrape device.Such as Shown in Fig. 4, repairing and scraping device 1 further includes overheating protection portion 50, and overheating protection portion 50 is connect with heating part 40, for detecting fixture 20 Temperature, and the temperature of fixture 20 be more than preset temperature when, control heating part 40 stop heating.

Here, overheating protection portion 50 can be the overcurrent protection device with temperature detecting function and control function, thus right Temperature on fixture 20 is detected, and is disconnected and electricity when the temperature on fixture 20 is more than preset value by control heating part 40 The modes such as the connection in source, to make heating part 40 stop heating, the utility model is at this to the specific controlling party in overheating protection portion 50 Formula is not specifically limited, as long as can control heating part 40 stops heating.Exemplary, preset temperature can be 450 DEG C, with Avoiding fixture temperature is more than that 450 DEG C repair scrapes device and repair to the packing material at solar components edge when scraping, and causes the sun Can glue film on component volume-diminished due to ambient temperature is excessively high, thus the problem of influencing solar components quality.

In the present embodiment, by repair scrape on device be arranged overheating protection portion the temperature of fixture can be controlled, keep away Exempt from excessively high the repairing of fixture temperature and scrape device when repairing the packing material for scraping solar components edge, causes the glue on solar components Film volume-diminished due to ambient temperature is excessively high, thus the problem of influencing solar components quality.

In one embodiment, overheating protection portion 50 includes: temperature sensor and controller.Temperature sensor is located at fixture 20 On, and be electrically connected with the controller, for detecting the temperature of fixture 20, and the temperature information that will test is sent to controller.Control Device processed is connect with heating part 40, and whether the temperature information for judging that temperature sensor 1 is sent is more than preset temperature value, and at this When temperature information is more than preset temperature value, control heating part 40 stops heating.Here, temperature detector can also detect fixture 20 Temperature whether be lower than default heating temperature, and when the temperature of fixture 20 is lower than default heating temperature, send temperature to controller Information is spent, exemplary, which can be 100 DEG C.The temperature that controller can also be sent according to temperature sensor Information begins to warm up to control heating part 40.

Here, temperature sensor can be located at any position of fixture 20, and the utility model is at this to temperature sensor Position on fixture 20 is not particularly limited, as long as can detecte the temperature on fixture 20.Controller, which can be located at, to be repaired It scrapes at any position of device 1, can be stopped by the modes such as be electrically connected of control heating part 40 and power supply to control heating part 40 It only heating and begins to warm up, the utility model is not specifically limited the specific control mode in overheating protection portion 50 at this, as long as It can control heating part 40 to stop heating and begin to warm up.

In the present embodiment, using the temperature sensor being electrically connected to each other and controller as overheating protection portion, it can make The detection function and control function in Thermal protection portion separate, and facilitate the maintenance to overheating protection portion, practical.

In one embodiment, repairing and scraping device 1 further includes thermal insulation layer, thermal insulation layer be coated on temperature sensor 51 it Outside, for slowing down the temperature changing speed around temperature sensor 51.

Here, thermal insulation layer can be as the relatively slow and protective case made by slower material that radiates that heats up, and wrap It is overlying on around temperature sensor 51, to make around temperature sensor 51 when the temperature of fixture 20 quickly increases or quickly reduces The speed that is raised and lowered of temperature be slower than the temperature changing speed of fixture 20, be quickly increased to avoid in the temperature of fixture 20 When presetting power-off temperature and being reduced rapidly to preset heating temperature, there is controller control heating part 40 in heating and stop adding Between heat the case where frequent switching, extend the service life of heating part 40.

In the present embodiment, thermal insulation layer is arranged on temperature sensor can slow down the change of the temperature around temperature sensor Change speed, to avoid quickly being increased to default power-off temperature in the temperature of fixture and be reduced rapidly to default heating temperature When, controller controls heating part the case where heating and stopping frequent switching between heating, extends the service life of heating part.

In one embodiment, Fig. 5 is the positive structure diagram shown according to an exemplary embodiment repaired and scrape device.Such as Shown in Fig. 5, fixture 20 includes holding tank 21, and temperature sensor 51 is located in holding tank 21.

Here, holding tank 23 can be provided in fixture 20, so, it is ensured that the temperature sensing in holding tank 21 The temperature that device 51 detects is closest to the temperature on fixture 20.It is exemplary, as shown in figure 4, holding tank 21 can be set in fixture Close to one end of heating part 40 on 20, to facilitate the setting of temperature sensor 51.

In the present embodiment, setting accommodates the holding tank of temperature sensor in fixture, it is ensured that temperature sensor detection The temperature arrived also facilitates the setting of temperature sensor closest to the temperature of fixture.

In one embodiment, heating part 40 includes hand-held part and heat transfer part；The outer surface of hand-held part is provided with thermal insulation layer；It passes Hot spot is detachably connected in one end of hand-held part, and with fixture 20, and the thermal energy for generating heating part 40 is transferred to fixture 20。

Exemplary, heat transfer part can be one end that the groove of fixture 20 is penetrated on heating part 40, and heating part 40 is generated Thermal energy be transferred to fixture 20 and blade 10.Hand-held part can be the part being exposed at except fixture 20 on heating part 40.Here, Thermal insulation layer is made of the heat insulator that can block hot-fluid transmitting.Thermal insulation layer can be set in it is heat-insulated outside hand-held part Set, is transferred to except hand-held part, so that operator be made to be in heated condition in heating part with blocking the hot-fluid on heating part 40 When can also hold hand-held part by taking and scrape device using repairing.

In the present embodiment, thermal insulation layer is set on the hand-held part of heating part, operator is made to be in heating shape in heating part When state, it can hold hand-held part by taking and scrape device using repairing.

In one embodiment, Fig. 6 is the side structure schematic view shown according to an exemplary embodiment repaired and scrape device.Such as Shown in Fig. 6, fixture 20 further includes the first clamping part 22, the second clamping part 23 and fixed part 24.First clamping part 22 and the second folder It is opposite to hold portion 23, and setting has the gap A between the first clamping part 22 and the second clamping part 23, gap A is for accommodating portion blade. Fixed part 24 is detachably connected with the first clamp portion 22 and the second clamp portion 23, for portion blade to be fixed on the first clamping part 22 and second between clamping part 23.

Here, fixing piece 24, will not after being fixed on portion blade between the first clamping part 22 and the second clamping part 23 Two opposing outer faces that fixture 20 is located at 10 two sides of blade are stretched out, to prevent the part of protrusion and the edge of solar components from sending out Life is collided with.Here, fixing piece 24 can make the first clamping part 22 and the second clamping part 23 and portion by adjusting the width of gap A Blade is divided to be in clamp position and non-clamping state.For example, when needing to make 23 clamping part of the first clamping part 22 and the second clamping part When dividing blade, the width of gap A can be turned down by fixing piece 24, so that being located at the blade section and first in the A of gap The inner surface of clamping part 22 and the second clamping part 23 is closely affixed and move the blade section in the A of gap can not under external force It is dynamic, blade 10 is fixedly connected with the first clamping part 22 and the second clamping part 23 with this.When need by blade 10 from first clamping When being disassembled on portion 22 and the second clamping part 23, the width of gap A can be tuned up to can be by blade by fixing piece 24 10 take out from the A of gap.The utility model at this to the specific structure of fixed part 24 with no restriction, as long as with first clamping Portion 22 and the second clamping part 23 are detachably connected, and portion blade can be fixed on to the first clamping part 22 and the second clamping part 23 Between.

In the present embodiment, by set that portion blade is located at fixture for the connection structure between fixture and blade It in gap between one clamping part and the second clamping part, and is fixed, is can be convenient to blade by the part that is detachably fixed on fixture It is replaced, also, is had the advantages of simple structure and easy realization.

In one embodiment, fixed part 24 includes N number of fixing piece, wherein N is the integer more than or equal to 1；On fixture 20 It is provided with N number of first through hole, first through hole runs through the first clamping part 22 and the second clamping part 23；It is provided in blade section N number of Second through-hole, wherein the position of N number of second through-hole and the position of N number of first through hole correspond；Each fixing piece both passes through one A first through hole and corresponding second through-hole, by portion blade be fixed on the first clamping part 22 and the second clamping part 23 it Between.

Here, when N is 1, first through hole can be located at the middle position of fixture 20, the blade section in the A of gap At position corresponding with first through hole be equipped with the second through-hole, across the fixing piece of first through hole and the second through-hole by blade 10 with Fixture 20 is fixed.When length of the blade section in the A of gap on the extending direction of heating part 40 is larger, fixture 20 can be made Including at least two first through hole and two fixing pieces, wherein at least two first through hole is on fixture 20 along heating part 40 Extending direction be uniformly distributed；It is corresponding, the position of setting at least two and first through hole in the blade section being located in the A of gap Corresponding second through-hole is set, and each fixing piece is made to both pass through a first through hole and corresponding second through-hole, Blade 10 is fixedly connected with fixture 20 with this.Here, make at least two first through hole prolonging along heating part 40 on fixture 20 It stretches direction to be uniformly distributed, can make the fixing piece across first through hole and corresponding second through-hole that the blade section in the A of gap is complete It is complete fixed, it avoids causing blade to be displaced when by external force due to fixed unstable to blade section, influence, which is repaired, scrapes The case where.Exemplary, Fig. 7 is the positive structure diagram shown according to an exemplary embodiment repaired and scrape device.Such as Fig. 7 institute Show, fixture 20 is located at both ends and the axial symmetry of fixture 20, and fixture 20 including two first through hole (not shown)s Both ends be the both ends on the extending direction of heating part 40；It is provided in the blade section in the A of gap and two first Corresponding two the second through-hole (not shown)s of through-hole；Fixing piece 25A and 25B respectively correspond logical across two first Hole and two corresponding second through-holes.

Exemplary, fixing piece 25 can be the screw and nut being mutually matched, and screw passes through first through hole and corresponding the After two through-holes, it is fixed by nut.

In the present embodiment, by the way that on fixture and through-hole is arranged on blade, so that the fixing piece on fixture will by through-hole Fixture is fixed with blade, is had the advantages of simple structure and easy realization.

In one embodiment, the material of fixture 20 is titanium alloy.

Here, since titanium alloy heat resistance is high, and density is lower than the density of copper, thus with 20 phase of fixture that is made of copper Than that can reduce to repair and scrape device 1 and repairing inertia matter when scraping packing material using the lighter weight of fixture 20 made of titanium alloy Amount, collision dynamics when so as to reduce fixture 20 and solar components peripheral collision, mitigates the damage to solar components. Certainly, in other embodiments, can also be high using heat resistance, and density makes folder lower than the other materials of copper density Tool.

In the present embodiment, it can be collided in fixture and solar components edge using the fixture made of titanium alloy When, mitigate the damage to solar components.

In one embodiment, the material of thermal insulation layer is polyvinyl butyral or silica.

Those skilled in the art are considering specification and after practicing utility model disclosed herein, will readily occur to practical Novel other embodiments.This application is intended to cover any variations, uses, or adaptations of the utility model, these Variations, uses, or adaptations follow the general principle of the utility model and including undocumented skills of the utility model Common knowledge or conventional techniques in art field.The description and examples are only to be considered as illustrative, the utility model True scope and spirit are indicated by the following claims.

It should be understood that the utility model is not limited to the accurate knot for being described above and being shown in the accompanying drawings Structure, and various modifications and changes may be made without departing from the scope thereof.The scope of the utility model is only wanted by appended right It asks to limit.

Claims (11)

1. one kind, which is repaired, scrapes device characterized by comprising

Blade；

Fixture is fixedly connected with the blade, wherein is positioned at two opposing outer faces of the blade two sides on the fixture Smooth ramp, and the angle of the cutter head extending direction of the smooth ramp and the blade is obtuse angle.

2. repairing scrape device as described in claim 1, which is characterized in that the obtuse angle is 120 °~165 °.

3. repairing scrape device as described in claim 1, which is characterized in that further include:

Adherent layer, positioned at described two opposing outer faces of the fixture and the outer surface of the blade, the adherent layer is used for Prevent the adherency to be repaired for scraping material.

4. repairing scrape device as described in claim 1, which is characterized in that further include:

Heating part is connect with the fixture, for generating thermal energy when being powered, and the thermal energy of generation is transferred to the fixture.

5. repairing scrape device as claimed in claim 4, which is characterized in that further include:

Overheating protection portion is connect with the heating part, is more than for detecting the temperature of the fixture, and in the temperature of the fixture When preset temperature, controls the heating part and stop heating.

6. repairing scrape device as claimed in claim 5, which is characterized in that the overheating protection portion includes:

Temperature sensor is located on the fixture, is electrically connected with the controller, for detecting the temperature of the fixture, and will test To temperature information be sent to the controller；

The controller is connect with the heating part, for judge temperature information that the temperature sensor is sent whether be more than Preset temperature value, and when the temperature information is more than the preset temperature value, it controls the heating part and stops heating.

7. repairing scrape device as claimed in claim 6, which is characterized in that described repair scrapes device further include:

Thermal insulation layer is coated on except the temperature sensor, for slowing down the temperature change around the temperature sensor Speed.

8. repairing as claimed in claim 6 and scraping device, which is characterized in that the fixture includes:

Holding tank, the temperature sensor are located in the holding tank.

9. repairing scrape device as claimed in claim 4, which is characterized in that the heating part further include:

Hand-held part and heat transfer part；

The hand-held part, outer surface are provided with thermal insulation layer；

The heat transfer part is detachably connected, for producing the heating part positioned at one end of the hand-held part, and with the fixture Raw thermal energy is transferred to the fixture.

10. repairing as described in claim 1 and scraping device, which is characterized in that the fixture includes:

First clamping part and the second clamping part, first clamping part is opposite with second clamping part, and first clamping It is arranged between portion and second clamping part and has the gap, the gap is for accommodating portion blade；

Fixed part is detachably connected with first clamping part and second clamping part, for fixing the portion blade Between first clamping part and second clamping part.

11. repairing scrape device as claimed in claim 7, which is characterized in that the material of the thermal insulation layer is polyvinyl alcohol contracting Butyraldehyde or silica.