CN218925624U - Exhaust hood of texturing machine and texturing machine - Google Patents

Abstract

The embodiment of the application provides a wool making machine exhaust hood and a wool making machine, and relates to the field of wool making equipment. The exhaust hood of the texturing machine comprises air exhausting plates which are arranged in a surrounding manner to form a cylinder shape, an exhaust duct is arranged between the air exhausting plates in a surrounding manner, the lower end opening of the exhaust duct is closed by a bottom plate, and the upper end opening is an exhaust outlet; the air exhausting plate is provided with a plurality of air exhausting holes, all the air exhausting holes are arranged between the bottom plate and the air outlet, and the air exhausting plate is provided with a heating element. The solid alkali crystals are not easy to condense on the exhaust hood of the texturing machine, the number of reworked sheets is greatly reduced, and meanwhile, the phenomenon that the solid alkali crystals fall on the surface of a silicon wafer and cause abnormal performance of a solar cell due to the alkali crystals can be well avoided.

Description

Exhaust hood of texturing machine and texturing machine

Technical Field

The application relates to the field of texturing equipment, in particular to a ventilating hood of a texturing machine and the texturing machine.

Background

The texturing process is extremely important in the whole silicon cell preparation field, and in the texturing process, alkali liquor in a cleaning tank is generally utilized to clean and texture the surface of a silicon wafer so as to remove a mechanical damage layer on the surface of the silicon wafer, clean surface dirt and metal impurities, and form pyramid-shaped textured surfaces on the surface of the silicon wafer so as to increase the absorption of sunlight, thereby improving the photoelectric conversion efficiency of the cell.

At present, in the texturing process, a silicon wafer is generally cleaned and textured by hot alkali liquor in a well-ventilated environment. However, the alkali solution is easily evaporated to form steam and is liquefied on the surface of the exhaust hood to form solid alkali crystals. The solid alkali crystals are easy to drop on the surface of the silicon wafer, so that a large number of reworked sheets are caused, and meanwhile, the performance of the solar cell is abnormal.

Disclosure of Invention

The embodiment of the application provides a wool making machine exhaust hood and wool making machine, alkali steam is difficult to liquefy and form solid alkali crystallization on the wool making machine exhaust hood, has greatly reduced the quantity of reworked pieces, simultaneously also can avoid solid alkali crystallization to drop on the silicon chip surface well, leads to solar cell because the phenomenon that the performance is unusual appears in alkali crystallization.

In a first aspect, an embodiment of the present application provides a exhaust hood of a texturing machine, which includes an air exhaust plate enclosed into a cylinder shape, an exhaust duct enclosed between the air exhaust plates, wherein an opening at a lower end of the exhaust duct is closed by a bottom plate, and an opening at an upper end of the exhaust duct is an exhaust outlet; the air exhausting plate is provided with a plurality of air exhausting holes, all the air exhausting holes are arranged between the bottom plate and the air outlet, and the air exhausting plate is provided with a heating element.

In the implementation process, when the exhaust hood of the wool making machine works, steam enters the exhaust duct through the exhaust holes on the air exhaust plate and is exhausted through the exhaust duct, so that a good ventilation environment is created; the air exhaust holes are arranged along the direction from the bottom plate to the air outlet, so that the ventilation rate of the exhaust hood of the texturing machine can be improved to the greatest extent.

When the exhaust hood of the wool making machine works, the heating piece can heat the exhaust plate so as to improve the temperature of the exhaust plate, hot alkali steam is not easy to liquefy on the hot exhaust plate and then form solid alkali crystals, and the number of reworked sheets is greatly reduced. And even if solid alkali crystals are formed in the exhaust duct, the solid alkali crystals can fall on the bottom plate and cannot pollute the silicon wafer.

With reference to the first aspect, in an optional embodiment of the present application, the exhaust hood of the texturing machine further includes a spray pipe capable of spraying water to the exhaust plate, and the spray pipe is located outside the exhaust duct.

When the texturing process is suspended, the spray pipe is arranged outside the exhaust duct and can spray water to the air exhaust plate, so that even if solid alkali crystals are formed on the outer surface of the air exhaust plate, the spray pipe can wash the solid alkali crystals on the air exhaust plate, and the quality of the silicon wafer is prevented from being influenced by falling of the solid alkali in the texturing process.

In combination with the first aspect, in an optional embodiment of the present application, the cross section of the exhaust duct is an isosceles trapezoid, the exhaust plate includes two inclined exhaust side plates with two sides corresponding to two inclined sides of the isosceles trapezoid, and at least one straight exhaust side plate with one side corresponding to the bottom side of the isosceles trapezoid, and the exhaust holes are distributed on the two inclined exhaust side plates.

The section of the exhaust duct is isosceles trapezoid, and the exhaust holes are distributed on the two inclined exhaust side plates, so that the exhaust range of the exhaust hood of the wool making machine is enlarged, and a better ventilation effect can be achieved.

In combination with the first aspect, in an optional embodiment of the present application, the exhaust holes are arranged in two rows, and a row of exhaust holes are respectively arranged on each inclined exhaust side plate.

A row of air exhaust holes are formed in each inclined air exhaust side plate, so that the air exhaust effect of the exhaust hood of the wool making machine is improved.

In combination with the first aspect, in an alternative embodiment of the present application, the exhaust holes on the two oblique exhaust side plates are symmetrically arranged.

The exhaust holes are symmetrically distributed, which is beneficial to reducing the preparation difficulty of the exhaust hood of the wool making machine.

In combination with the first aspect, in an optional embodiment of the present application, a wind blocking barrel is arranged around each air suction hole, the wind blocking barrel is located in the exhaust duct, one end, away from the air suction hole, of the wind blocking barrel is provided with a wind discharging nozzle, and the size of the wind discharging nozzle is smaller than that of the air suction hole.

The air blocking cylinder can form a narrow air flow channel, which is favorable for increasing the air draft force, can realize better ventilation effect and prevents steam from flowing backwards to a workshop.

In combination with the first aspect, in an alternative embodiment of the present application, an axis of the wind blocking barrel is inclined downward relative to an axis of the exhaust duct.

The axis of the air blocking cylinder is inclined downwards relative to the axis of the exhaust duct, so that even if solid alkali crystals fall from the upper part, the solid alkali crystals cannot fall to a production workshop through the exhaust hole, and the silicon wafer can be further prevented from being polluted by the solid alkali crystals.

With reference to the first aspect, in an optional embodiment of the present application, the exhaust hood of the texturing machine further includes a waste liquid pipe, and the waste liquid pipe is located below the bottom plate and is communicated with the exhaust duct.

The waste liquid pipeline can play a role in draining waste liquid, and if part of water vapor is condensed on the bottom plate or solid alkali is crystallized and falls on the bottom plate, the waste liquid can be discharged to the outside of the exhaust hood of the texturing machine through the waste liquid pipeline; and the liquid discharged from the waste liquid pipeline can be collected and recycled.

In combination with the first aspect, in an optional embodiment of the present application, an exhaust device for exhausting air outwards is further communicated above the air outlet of the air exhaust duct.

The air draft device can provide power to ensure that alkali steam can be exhausted to the outside of the exhaust hood of the texturing machine through the air draft hole and the exhaust duct.

In a second aspect, an embodiment of the present application provides a wool making machine, which includes a soda liquid tank and the foregoing exhaust hood of the wool making machine, where the exhaust hood of the wool making machine is located above the soda liquid tank, and the bottom plate is close to the soda liquid tank.

In the implementation process, when the texturing machine in the embodiment begins to texture the silicon wafer, alkali vapor in the alkali liquid tank enters the exhaust pipeline through the exhaust holes on the air exhausting plate under the action of the exhaust device and is then exhausted. Because the air exhausting plate is provided with the heating element, the air exhausting plate can be heated, so that alkali steam is not easy to liquefy on the air exhausting plate and form solid alkali crystals.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a hood of a texturing machine according to an embodiment of the present disclosure;

FIG. 2 is a schematic cross-sectional view of an exhaust duct according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a wind blocking barrel according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of a texturing machine according to an embodiment of the present application.

Icon: 001-exhaust hood of the texturing machine; 002-alkaline solution tank; 003-texturing machine; 100-exhaust plate; 110-an exhaust duct; 120-a bottom plate; 130-an exhaust outlet; 140-an air suction hole; 150-heating element; 160-oblique exhaust side plates; 170-a straight exhaust side plate; 200-a waste liquid pipeline; 300-spraying pipes; 400-wind blocking cylinder; 410-exhaust nozzle.

Detailed Description

Embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical solutions of the present application, and thus are only examples, and are not intended to limit the scope of protection of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the present application and in the description of the drawings above are intended to cover non-exclusive inclusions.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "upper", "lower", "bottom", "inner", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

When the solar cell is manufactured, the silicon wafer is generally subjected to a cleaning and texturing process to form pyramid-shaped textured surfaces on the surface of the silicon wafer, so that the photoelectric conversion efficiency of the solar cell is improved. In the prior art, in the process of cleaning and texturing, a silicon wafer is usually placed in a texturing machine, and then the silicon wafer is cleaned and textured by using hot alkali liquor. In the working procedure of cleaning and texturing, the texturing machine needs to keep a good ventilation environment, so the texturing machine is provided with an exhaust hood; however, the hot alkali solution is easily liquefied on the surface of the exhaust hood to form solid alkali crystals after evaporation. The solid alkali crystals are easy to drop on the surface of the silicon wafer, so that a large number of reworked sheets are caused, and meanwhile, the performance of the solar cell is abnormal.

In order to solve the problem of exhaust hood in the existing wool making machine, the exhaust hood of the wool making machine is improved, so that alkali steam is not easy to liquefy and form solid alkali crystals, the number of reworked sheets is greatly reduced, and meanwhile, the phenomenon that the solid alkali crystals fall on the surface of a silicon wafer to cause abnormal performance of a solar cell due to the alkali crystals can be well avoided.

The exhaust hood 001 and the texturing machine 003 of the present application will be specifically described below with reference to examples.

First embodiment

Referring to fig. 1 to 3, an exhaust hood 001 of a texturing machine provided in this embodiment includes an exhaust plate 100 enclosed in a cylinder shape, an exhaust duct 110 is enclosed in a region enclosed between the exhaust plates 100, a bottom plate 120 is used to close the lower end of the exhaust duct 110, and an exhaust outlet 130 is formed at the upper end of the exhaust duct; the air exhaust plate 100 is distributed with a plurality of air exhaust holes 140, all the air exhaust holes 140 are arranged between the bottom plate 120 and the air outlet 130, and the air exhaust plate 100 is provided with a heating element 150.

It should be noted that, in the embodiment of the present application, the enclosing of the exhaust plate 100 into a cylinder refers to that the exhaust plate 100 may be used as a part of a side wall of the exhaust duct 110, and enclosed together with a wall in the exhaust system to form a cylinder structure (i.e., the exhaust plate 100 at this time is similar to a semi-closed structure); the exhaust duct 110 may be formed as a cylindrical structure (i.e., the exhaust panel 100 is similar to a fully-closed structure) by itself. The air discharge plate 100 in this embodiment is a semi-closed structure, which is enclosed to form a cylindrical structure (as shown in fig. 2) together with a side wall as the entire side wall of the air discharge duct 110.

It should be further noted that, in the embodiment of the present application, the "a plurality of air extraction holes 140" means that the number of air extraction holes 140 is not less than two. Illustratively, the number of the air extraction holes 140 in the present embodiment is 18.

In this embodiment, since the heating element 150 is disposed on the air exhaust plate 100, the air exhaust plate 100 can be kept at a high temperature, so that even if the hot alkali vapor contacts the air exhaust plate 100, the alkali vapor is not easy to liquefy on the surface of the air exhaust plate 100 to generate solid crystals, but enters the air exhaust duct 110 along the air exhaust hole 140 and is then exhausted from the air exhaust outlet 130. In order to ensure that the heating element 150 does not affect the working space of other components, the heating element 150 of this embodiment is generally embedded in the exhaust plate 100 (see fig. 3), and the shape and distribution of the heating element 150 cannot be observed on the surface of the exhaust plate 100. Of course, in other embodiments, the heating element 150 may be disposed on the surface of the air exhaust plate 100, so long as the air exhaust opening 130 and the air exhaust hole 140 are not blocked.

In this embodiment, in order to ensure that the hot alkaline solution can be more easily discharged to the external environment through the air outlet 130, an air extracting device (not shown) is disposed above the air outlet 130, and the air extracting device is communicated with the air outlet 110 and can extract air.

In addition, in the present embodiment, the exhaust hood 001 of the texturing machine further includes a waste liquid pipe 200, and the waste liquid pipe 200 is disposed below the bottom plate 120 and is in communication with the exhaust duct 110, so that if the alkali liquid is liquefied in the exhaust duct 110, the alkali liquid is discharged through the waste liquid pipe 200 and is not accumulated in the exhaust duct 110; in addition, the liquid discharged from the waste liquid pipe 200 can be collected and recycled.

In this embodiment, the cross section of the exhaust duct 110 is in an isosceles trapezoid structure (see fig. 2), and in the isosceles trapezoid exhaust duct 110, the exhaust plate 100 includes two inclined exhaust side plates 160 with two sides corresponding to two inclined sides of the isosceles trapezoid, and one straight exhaust side plate 170 with one side corresponding to the shorter bottom of the isosceles trapezoid; the air exhaust holes 140 are distributed on the two inclined air exhaust side plates 160, which is beneficial to expanding the air exhaust range, and the heating element 150 is distributed between two adjacent air exhaust holes 140.

More specifically, in the present embodiment, all the air extraction holes 140 are arranged in two rows, each of the inclined air extraction side plates 160 is provided with one row of air extraction holes 140, and the two rows of air extraction holes 140 are symmetrically arranged, and the symmetry axis is the axis of the air extraction duct 110, and since the total amount of the air extraction holes 140 in the present embodiment is 18, each of the inclined air extraction side plates 160 is provided with 9 air extraction holes 140 arranged in one row. The air exhaust holes 140 are symmetrically distributed, which is beneficial to reducing the preparation difficulty of the exhaust hood 001 of the wool making machine.

Of course, in other embodiments, the cross section of the exhaust duct 110 may be triangular, square, pentagonal, circular, etc., which are not described herein. In other embodiments, even if the cross section of the exhaust duct 110 has an isosceles trapezoid structure, the arrangement manner and number of the exhaust holes 140 may be changed, for example, only one of the oblique exhaust side plates 160 may be provided with the exhaust holes 140, or two or more than two rows of exhaust holes 140 may be provided in each oblique exhaust side plate 160, and the number of the exhaust holes 140 in each row may be 4, 5, 8, 9, etc.

In addition, in the present embodiment, a shower pipe 300 is further provided at the outside of the exhaust duct 110, and the shower pipe 300 can spray water to the exhaust plate 100, so that even if solid alkali crystals are formed on the outer surface of the exhaust plate 100, water can be sprayed to the exhaust plate 100 through the shower pipe 300 during the suspension of the texturing process to remove the solid alkali crystals.

Because the cross section of the exhaust duct 110 in this embodiment is isosceles trapezoid, and the air exhaust holes 140 are divided into two rows, and each inclined air exhaust side plate 160 is distributed with one row of air exhaust holes 140, the spray pipe 300 in this embodiment is generally installed on the straight air exhaust side plate 170, one end of the spray pipe is close to the bottom plate 120, the other end of the spray pipe is close to the air exhaust opening 130, and the through holes are formed in the side wall of the spray pipe 300, and then hot water is introduced into the spray pipe 300, so that solid alkali crystals can be removed well by spraying water mist or directly spraying water. And disclosed herein in the foregoing: since the waste liquid pipe 200 communicating with the exhaust duct 110 is provided below the bottom plate 120, even if a rinse liquid enters the exhaust duct 110 through the air suction hole 140 when the shower pipe 300 sprays and washes the air suction hole 140, the rinse liquid can be discharged through the waste liquid pipe 200 and does not accumulate in the exhaust duct 110.

It should be noted that "one shower 300" in the present embodiment is not to be construed as limiting the number of shower 300; in other embodiments, the number of shower pipes 300 may be two or more for better shower effect. In other embodiments, the mounting location of the shower pipe 300 may vary as the cross-section of the exhaust duct 110 varies. For example, when the cross section of the exhaust duct 110 is triangular, the shower pipe 300 may be disposed between two plates corresponding to the hypotenuses, similar to the arrangement of the present application; as for other cross-sectional conditions, the shower 300 may be correspondingly disposed beside the air suction hole 140, so that the shower 300 may be guaranteed to flush the air suction hole 140, which is not described herein.

In addition, in this embodiment, the wind shielding cylinder 400 is further enclosed around each of the air exhaust holes 140, the wind shielding cylinder 400 is located in the air exhaust duct 110, the edge of the wind shielding cylinder 400 away from the air exhaust holes 140 encloses to form the air exhaust nozzle 410, and the size of the air exhaust nozzle 410 is smaller than that of the air exhaust holes 140. More specifically, in the present embodiment, the inner diameter of the wind shielding cylinder 400 is gradually reduced, and the inner diameter of the wind shielding cylinder 400 is minimized when the position of the air discharging nozzle 410 is reached; thus, once the air is exhausted, the air exhausting force is gradually increased along with the gradual decrease of the inner diameter of the air blocking cylinder 400, so that the exhaust hood 001 of the whole wool making machine can realize better ventilation effect; and hot alkali vapor is difficult to flow backward to the plant due to the shielding of the exhaust nozzle 410.

In addition, in the present embodiment, the axis of the air blocking barrel 400 is inclined downward relative to the axis of the air exhaust duct 110, so that even if the solid alkali crystals fall from above, the solid alkali crystals cannot fall to the production workshop through the air exhaust hole, and the silicon wafer can be further prevented from being polluted by the solid alkali crystals. Of course, in other embodiments, the axis of the air blocking drum 400 may be inclined upwards relative to the axis of the air exhausting duct 110, which is more beneficial to increase the air exhausting effect of the exhaust hood 001 of the texturing machine, but the effect of preventing the solid alkali from crystallizing and falling is not obvious. The inclination upward or inclination downward may be selected according to practical situations, and will not be described herein.

The following describes the working procedure of the exhaust hood 001 of the texturing machine in this embodiment:

when the exhaust hood 001 of the wool making machine in the embodiment works, the exhaust device is started, at this time, under the action of the exhaust device, alkali steam can enter the exhaust duct 110 through the exhaust holes 140 on the air exhaust plate 100, and then is exhausted to the outside from the exhaust duct 110, so that a good ventilation environment can be formed; and since the air exhaust holes 140 are aligned along the bottom plate 120 to the air outlet 130, it is advantageous to maximize the ventilation effect. Since the hot alkali solution is easily liquefied in the exhaust duct 110, a waste liquid duct 200 is further connected below the bottom plate 120, and once the alkali solution is liquefied in the exhaust duct 110 and falls onto the bottom plate 120, the alkali solution can be discharged through the waste liquid duct 200 without being accumulated in the exhaust duct 110.

During ventilation, the heating member 150 on the louver 100 heats the louver 100, and hot alkali vapor is not easily liquefied on the hot louver 100 and then forms solid alkali crystals, which can greatly reduce the number of reworked chips.

In addition, the wind blocking cylinders 400 arranged around the four sides of each air suction hole 140 can not only enhance the air suction effect, but also prevent the backflow of hot alkali liquor; moreover, because the axis of the air blocking cylinder 400 is inclined downwards relative to the axis of the exhaust duct 110, even if solid alkali crystals fall, the solid alkali crystals cannot fall into a production workshop through the exhaust holes, and the silicon wafer can be further prevented from being polluted by the solid alkali crystals. And in the working process of the exhaust hood 001 of the fleece-making machine, if the outer surface is truly contaminated with solid alkali crystals, the solid alkali crystals can be removed by spraying through the spraying pipe 300 when the exhaust hood 001 of the fleece-making machine stops working.

Second embodiment

As shown in fig. 1 to 4, the present embodiment provides a wool making machine 003, which includes a alkali liquid tank 002 and a wool making machine exhaust hood 001 in the first embodiment, wherein the wool making machine exhaust hood 001 is located above the alkali liquid tank 002, and a bottom plate 120 of the wool making machine exhaust hood 001 is close to the alkali liquid tank 002.

In actual plant production, there is not only one, but typically more, of the number of the refiner hoods 001 above the alkaline tank 002. In this embodiment, for simplicity of explanation, only one exhaust hood 001 of the texturing machine is provided above the alkali lye tank 002.

In addition, the shower 300 in the exhaust hood 001 of the texturing machine in the first embodiment can not only flush the exhaust plate 100, but also flush other structures in the texturing machine 003, so as to better avoid solid alkali crystals from falling onto the surface of the silicon wafer and affecting the photoelectric conversion efficiency of the solar cell.

When the texturing machine 003 in this embodiment begins to texture the silicon wafer, the alkali vapor in the alkali lye tank 002 enters the exhaust duct 110 through the exhaust holes 140 on the air exhaust plate 100 under the action of the exhaust device, and is then exhausted. Since the air discharge plate 100 is provided with the heating member 150, the air discharge plate 100 can be heated, so that the alkali vapor is not easy to liquefy on the air discharge plate 100 and form solid alkali crystals. Even if a small amount of alkali crystals are formed, the shower pipe 300 can flush the exhaust plate 100 to re-flush the solid alkali crystals into the alkali liquor tank 002 or into the waste liquor pipeline 200 without polluting the silicon wafer.

The above is only an example of the present application, and is not intended to limit the scope of the present application, and various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims (10)

1. The exhaust hood of the wool making machine is characterized by comprising exhaust plates which are arranged in a surrounding manner to form a cylinder, wherein an exhaust channel is arranged between the exhaust plates in a surrounding manner, the lower end opening of the exhaust channel is closed by a bottom plate, and the upper end opening is an exhaust outlet; the air exhausting plate is provided with a plurality of air exhausting holes, all the air exhausting holes are arranged between the bottom plate and the air outlet, and the air exhausting plate is provided with a heating element.

2. The lint making machine exhaust hood of claim 1, further comprising a shower capable of spraying water to the exhaust plate, the shower being located outside the exhaust duct.

3. The exhaust hood of the wool making machine according to claim 1, wherein the cross section of the exhaust duct is in an isosceles trapezoid shape, the exhaust plate comprises two inclined exhaust side plates with two sides corresponding to two inclined sides of the isosceles trapezoid shape, and at least one straight exhaust side plate with one side corresponding to the bottom side of the isosceles trapezoid shape, and the exhaust holes are distributed on the two inclined exhaust side plates.

4. A hood for a fleece machine according to claim 3, wherein all of said ventilation holes are arranged in two rows and each of said diagonal side panels is provided with a row of said ventilation holes.

5. A wool making machine exhaust hood according to claim 3, characterized in that said suction holes in both said oblique exhaust side panels are symmetrically arranged.

6. The air exhaust hood of the wool making machine according to claim 1, wherein air blocking cylinders are arranged around each air exhaust hole, the air blocking cylinders are located in the air exhaust channels, an air exhaust nozzle is arranged at one end, away from the air exhaust holes, of each air blocking cylinder, and the size of each air exhaust nozzle is smaller than that of each air exhaust hole.

7. The pile engine hood of claim 6, wherein the axis of the air blocking duct is inclined downwardly relative to the axis of the air exhaust duct.

8. The lint making machine exhaust hood of claim 1, further comprising a waste liquid conduit located below the floor and in communication with the exhaust duct.

9. The exhaust hood of the wool making machine according to claim 1, wherein an exhaust device for exhausting air outwards is further communicated above the exhaust outlet of the exhaust duct.

10. A wool making machine, characterized in that it comprises an alkali liquor tank and a wool making machine exhaust hood according to any one of claims 1-9, said wool making machine exhaust hood being located above said alkali liquor tank and said bottom plate being adjacent to said alkali liquor tank.

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