A positive and negative pressure airflow regulating device for a rotary kiln and a regulating method thereof

Abstract

The present invention discloses a positive and negative pressure airflow regulating device for a rotary kiln and a regulating method thereof, which relates to the technical field of rotary kilns. The invention aims to solve the problem that in the process of using and operating the existing rotary kilns, there is only one air pressure and atmosphere in the furnace, and the atmosphere required by the material cannot be adjusted in time, resulting in the powder reaction being affected. The second connection is installed at one end of the isolation cover body, and a second side plate is provided between the isolation cover body and the second connecting shaft. A first side plate is provided between the unloading annular cover and the first connecting shaft. An airflow regulating plate is provided inside one end of the second connecting shaft, and the airflow regulating plate is threadedly connected to the second connecting shaft by bolts, and the bolts are provided in number. A fixing plate is provided on one side of the interior of the second connecting shaft, and the fixing plate is provided in number. The several bolts are all installed on the fixing plate, and the first regulating plate and the second regulating plate are installed inside the airflow regulating plate.

Description

Technical Field

[0001] The present invention relates to the technical field of rotary kilns, and in particular to a positive and negative pressure airflow regulating device for a rotary kiln and a regulating method. Background Art

[0002] A rotary kiln is a thermal process equipment used for calcining, roasting, or drying granular and powdered materials. As a conventional kiln type, rotary kilns have existed for over a century, but they have always been large or extra-large, primarily used for the primary processing of powders or mineral materials. To prevent accidents caused by power outages when the rotary kiln is in the non-holding position, an emergency drive motor is installed to ensure the rotary kiln's safe return to the holding position. The rotary kiln body is a long steel cylinder.

[0003] For example, the announcement number is 201910344661.9 (a rotary kiln), which includes: a sleeve and a sealing filler arranged in the sleeve; a furnace body, the furnace body has a rotary support end, and the rotary support end is provided with a sealing assembly; the sleeve is sleeved on the outer periphery of the rotary support end and forms an annular accommodating space, the sealing filler is filled in the annular accommodating space, the sleeve is sealed and connected to the rotary support end through the sealing filler, the rotary support end and the sealing filler are rotatably connected, and the rotary support end and the sealing filler are dynamically sealed; a sealing monitoring assembly is connected to the sealing assembly, and the sealing monitoring assembly includes a gas concentration detector, which detects the gas concentration in the rotary support end area through the gas concentration detector to monitor the sealing status of the rotary support end and the sealing filler. The rotary kiln of the embodiment of the present invention can judge the wear condition and sealing status of the sealing filler in real time and accurately, and the detection process is simple and quick, which effectively reduces the labor intensity of the detection process.

[0004] During operation, existing rotary kilns only have one air pressure and atmosphere inside, making it impossible to adjust the atmosphere required by the material in a timely manner, which affects the reaction of the powder. To address this issue, we provide a positive and negative pressure airflow adjustment device for a rotary kiln and a method for adjusting the airflow. Summary of the Invention

[0005] The purpose of the present invention is to provide a positive and negative pressure airflow regulating device for a rotary kiln and a method for regulating the use thereof, so as to solve the problem raised in the above background technology that the existing rotary kilns have only one air pressure and atmosphere in the furnace during use and operation, and cannot adjust the atmosphere environment required by the material in time, resulting in the powder reaction being affected.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a positive and negative pressure airflow regulating device for a rotary kiln, comprising an exhaust device body, a main drive motor and an isolation cover body, wherein a first external connection cover is provided at one end of the main drive motor, a second external connection cover is provided at one end of the first external connection cover, an annular cover is provided at one end of the second external connection cover, a third external connection cover is provided at one side of the annular cover, a first connecting shaft is provided at one end of the third external connection cover, a blanking annular cover is provided at one end of the first connecting shaft, an isolation cover body is provided at one side of the blanking annular cover, and the isolation cover body is fixedly connected to the blanking annular cover;

[0007] Also includes:

[0008] A second connecting shaft is mounted on one end of the isolation cover body, a second side plate is provided between the isolation cover body and the second connecting shaft, a first side plate is provided between the blanking annular cover and the first connecting shaft, an airflow adjustment plate is provided inside one end of the second connecting shaft, the airflow adjustment plate is threadedly connected to the second connecting shaft by bolts, and the bolts are provided with a plurality of bolts, a fixing plate is provided on one side of the interior of the second connecting shaft, and the fixing plate is provided with a plurality of bolts, and the plurality of bolts are all installed on the fixing plate;

[0009] a first regulating piece and a second regulating piece installed inside the airflow regulating plate, wherein the first regulating piece is arranged in a circle on the outer wall of the airflow regulating plate, and six second regulating pieces are provided, and a plurality of the first regulating pieces and the second regulating pieces are integrally formed with the airflow regulating plate;

[0010] A negative pressure distribution chamber is installed inside the first connecting shaft, and there are several negative pressure distribution chambers. The outer wall of the other end of the discharge annular cover is provided with a discharge chamber, and there are several discharge chambers.

[0011] Preferably, a feed storage mechanism is provided above the first external connection cover, a planetary feed mechanism is provided above the feed storage mechanism, a drive motor is provided on one side of the planetary feed mechanism, and a feed pipe is provided above the planetary feed mechanism.

[0012] Preferably, a bracket frame is provided on the lower end surface of the first external connection cover.

[0013] Preferably, a second observation window is provided inside the first side plate, and the second observation window is embedded and fixedly connected to the first side plate, and a second negative pressure cavity is provided inside the isolation cover.

[0014] Preferably, a connecting pipe is provided at one end of the annular cover, and one end of the connecting pipe is installed on one side of the exhaust device body, and a first observation window is provided on the upper end face of the connecting pipe, and a first inner cavity is provided inside the connecting pipe, and an inner baffle is provided inside the first inner cavity, and a hand valve adjusting rod is provided on one side of the connecting pipe, and one end of the hand valve adjusting rod passes through and extends to the inside of the first inner cavity, and one end of the hand valve adjusting rod is installed on the inner baffle, and a slag discharge pipe is provided on the lower end face of the annular cover.

[0015] Preferably, the upper end face of the vacuum device body is provided with an upper vacuum conveying connection mechanism, the lower end face of the vacuum device body is provided with a first conveying pipeline, the lower end face of the first conveying pipeline is provided with a planetary unloading drive, and a support rod is provided on the outside of the vacuum device body.

[0016] Preferably, a first negative pressure cavity is provided inside the third external connecting cover, a slag discharge cavity is provided inside the slag discharge pipe, a feed inner cavity is provided inside the feed receiving mechanism, and a threaded conveying rod is provided inside the first external connecting cover and the second external connecting cover, and one end of the threaded conveying rod passes through and extends to the inside of the third external connecting cover and the first connecting shaft.

[0017] Preferably, a method for using a positive and negative pressure airflow regulating device for a rotary kiln comprises the following steps:

[0018] Step 1: Before the overall system of the positive and negative pressure airflow regulating device is used in the rotary kiln, the isolation cover is installed inside the rotary kiln, and the side of the rotary kiln is sealed by the first side plate. Before the rotary kiln processes the powder inside, the airflow regulating plate is set through experimental parameter calculation, and finally the first regulating piece and the second regulating piece on the airflow regulating plate are set and fixed at a certain angle to facilitate the fixation of the positive and negative pressure gas circulation parameters;

[0019] Step 2: When the rotary kiln is in use, the upper exhaust delivery connection mechanism is connected to the external exhaust mechanism, and the manual valve adjustment rod is adjusted to open the inner shielding plate. The positive pressure atmosphere processed inside the rotary kiln enters the second negative pressure cavity inside the isolation cover through the air flow adjustment plate, and then enters the first negative pressure cavity through the negative pressure distribution cavity;

[0020] Step three: The gas in the first negative pressure cavity is extracted by external suction. When the extracted gas is processed in the rotary kiln body, it will carry some dust particles into the first negative pressure cavity as the gas is transferred. When the particles hit the side baffle, the disappearance of the kinetic potential energy will discharge the particles through the slag discharge pipe, and the gas will enter the main body of the exhaust device through the connecting pipe. The gas will follow the centrifugal mechanism inside the main body of the exhaust device to separate the gas and the remaining impurities in the gas, and the impurities can be discharged through the first conveying pipe.

[0021] Step 4: At the same time, the planetary feeding mechanism set at the feeding end of the rotary kiln can effectively avoid the problem of external gas being missed when the material enters. At the same time, the planetary unloading drive set can also effectively avoid the entry of external gas during unloading, and the slag discharge pipe set is connected to the external sealed storage cover, which can not only prevent the entry of external gas, but also collect the slag discharge material.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention is provided with an exhaust device body, a planetary unloading drive, a connecting pipe, a hand valve regulating rod, an annular cover, a slag discharge pipe, an inner baffle, an air flow regulating plate, and a first negative pressure cavity and a second negative pressure cavity. The air flow regulating plate is provided, and the first regulating plate and the second regulating plate on the air flow regulating plate are set and fixed at an inclination angle to a certain extent through experimental parameter calculation. When the rotary kiln is in use, the upper exhaust conveying connecting mechanism is provided to connect to the external exhaust mechanism, and the hand valve regulating rod is adjusted to open the inner baffle. The positive pressure atmosphere processed inside the rotary kiln enters the second negative pressure cavity inside the isolation cover body through the air flow regulating plate in a small amount, and then enters the first negative pressure cavity through the negative pressure distribution cavity, which can effectively form two positive and negative pressure states inside the rotary kiln. Therefore, when operating on specific powder materials and requiring a specific atmosphere, the entire inner cavity of the rotary kiln can be quickly changed through the negative pressure operation, thereby avoiding the problem that the existing rotary kiln has only one air pressure and atmosphere in the furnace during operation, and cannot adjust the atmosphere environment required by the material in time, resulting in the powder reaction being affected.

[0024] 2. Through the slag discharge pipe and the planetary unloading drive below the main body of the exhaust device, the slag discharge pipe can block the dust particle impurities entering with the negative pressure. After losing some of the kinetic potential energy, they will fall and be discharged due to gravity. The tiny particles in the remaining negative pressure gas are separated from the gas by the centrifugal force generated inside the main body of the exhaust device. The impurities are transported to the planetary unloading drive mechanism below for discharge. At the same time, the planetary shape can effectively avoid the crossflow of internal and external gases during discharge, which affects the stability of the gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a left top view schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is a schematic diagram of a right top view of the overall structure of the present invention;

[0027] Figure 3 It is a front view schematic diagram of the overall structure of the present invention;

[0028] Figure 4 Schematic diagram of the overall internal structure of the present invention;

[0029] Figure 5 It is a schematic diagram of the overall side structure of the present invention;

[0030] Figure 6 It is a schematic diagram of the overall top view of the structure of the present invention;

[0031] Figure 7 This is a schematic diagram of the internal structure of the connecting pipe of the present invention;

[0032] Figure 8 Schematic diagram of the airflow adjustment plate structure of the present invention;

[0033] Figure 9 It is a schematic side view of the structure of the airflow adjustment plate of the present invention;

[0034] Figure: 1, exhaust device body; 101, planetary unloading drive; 102, first conveying pipe; 103, support rod; 104, upper exhaust conveying connection mechanism; 2, connecting pipe; 201, hand valve adjustment rod; 202, annular cover; 203, slag discharge pipe; 204, first inner cavity; 205, inner baffle; 206, first observation window; 3, main drive motor; 301, support frame; 302, threaded conveying rod; 4, first external connection cover; 5, feed pipe; 501, drive motor; 502, planetary feeding mechanism; 503, feed receiving Mechanism; 504, feed inner cavity; 6, second external connecting cover; 7, third external connecting cover; 701, first negative pressure cavity; 702, slag discharge cavity; 8, isolation cover; 801, discharge annular cover; 802, second negative pressure cavity; 9, first side plate; 901, second observation window; 902, second side plate; 10, first connecting shaft; 1001, negative pressure distribution cavity; 1002, discharge cavity; 11, second connecting shaft; 12, airflow adjustment plate; 1201, first adjustment plate; 1202, second adjustment plate; 13, bolt; 14, fixing plate. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0036] Example 1

[0037] See also Figure 1-9 , the present invention provides an embodiment: a positive and negative pressure airflow regulating device for a rotary kiln, comprising an exhaust device main body 1, a main drive motor 3 and an isolation cover 8, one end of the main drive motor 3 is provided with a first external connection cover 4, one end of the first external connection cover 4 is provided with a second external connection cover 6, one end of the second external connection cover 6 is provided with an annular cover 202, one side of the annular cover 202 is provided with a third external connection cover 7, one end of the third external connection cover 7 is provided with a first connecting shaft 10, one end of the first connecting shaft 10 is provided with a blanking annular cover 801, one side of the blanking annular cover 801 is provided with an isolation cover 8, and the isolation cover 8 is fixedly connected to the blanking annular cover 801;

[0038] Also includes:

[0039] The second connecting shaft 11 is mounted on one end of the isolation cover 8, a second side plate 902 is provided between the isolation cover 8 and the second connecting shaft 11, a first side plate 9 is provided between the blanking annular cover 801 and the first connecting shaft 10, an air flow adjustment plate 12 is provided inside one end of the second connecting shaft 11, the air flow adjustment plate 12 is threadedly connected to the second connecting shaft 11 by bolts 13, and the bolts 13 are provided in a plurality of numbers, a fixing plate 14 is provided on one side of the interior of the second connecting shaft 11, and the fixing plate 14 is provided in a plurality of numbers, and the plurality of bolts 13 are all installed on the fixing plate 14;

[0040] The first regulating piece 1201 and the second regulating piece 1202 are installed inside the airflow regulating plate 12. The first regulating piece 1201 is arranged on a circle on the outer wall of the airflow regulating plate 12. Six second regulating pieces 1202 are provided. Several first regulating pieces 1201 and second regulating pieces 1202 are formed integrally with the airflow regulating plate 12.

[0041] The negative pressure distribution chamber 1001 is installed inside the first connecting shaft 10, and there are several negative pressure distribution chambers 1001. The outer wall of the other end of the discharge ring cover 801 is provided with a discharge chamber 1002, and there are several discharge chambers 1002.

[0042] By setting up the airflow adjustment plate 12, and the first adjustment piece 1201 and the second adjustment piece 1202 on the airflow adjustment plate 12, the preliminary experimental parameters can be effectively demonstrated, and the first adjustment piece 1201 and the second adjustment piece 1202 can be set at a certain angle, so that when the positive pressure atmosphere is transported to the negative pressure cavity, the intake volume can be transported in a certain proportion.

[0043] Example 2

[0044] Please refer to 1. Figure 2 and Figure 3 A feeding and receiving mechanism 503 is provided above the first external connection cover 4, a planetary feeding mechanism 502 is provided above the feeding and receiving mechanism 503, a driving motor 501 is provided on one side of the planetary feeding mechanism 502, and a feeding pipe 5 is provided above the planetary feeding mechanism 502.

[0045] The setting of the planetary feeding mechanism 502 can effectively avoid the mutual circulation of internal and external air pressures caused by conveying powder to the interior of the device, thereby causing the negative pressure and positive pressure inside the rotary kiln to fluctuate.

[0046] Please refer to 1. Figure 2 and Figure 3 A bracket frame 301 is provided on the lower end surface of the first external connection cover 4 . The bracket frame 301 can effectively enhance the stability of the operation of the first external connection cover 4 .

[0047] See 2 and Figure 4 A second observation window 901 is provided inside the first side plate 9, and the second observation window 901 is embedded and fixedly connected to the first side plate 9. A second negative pressure cavity 802 is provided inside the isolation cover 8. The second observation window 901 can effectively make the internal state visible to the staff.

[0048] See 1 and Figure 2 A connecting pipe 2 is provided at one end of the annular cover 202, and one end of the connecting pipe 2 is installed on one side of the exhaust device body 1. A first observation window 206 is provided on the upper end surface of the connecting pipe 2, and a first inner cavity 204 is provided inside the connecting pipe 2. An inner baffle 205 is provided inside the first inner cavity 204, and a hand valve regulating rod 201 is provided on one side of the connecting pipe 2, and one end of the hand valve regulating rod 201 passes through and extends to the inside of the first inner cavity 204, and one end of the hand valve regulating rod 201 is installed on the inner baffle 205. A slag discharge pipe 203 is provided on the lower end surface of the annular cover 202.

[0049] The setting of the hand valve regulating rod 201 can effectively adjust the opening and closing angle of the inner baffle 205 inside the connecting pipe 2, and control the suction volume and the internal negative pressure rate through the opening and closing angle.

[0050] Please refer to 1. The upper end surface of the vacuum device body 1 is provided with an upper vacuum conveying connection mechanism 104, the lower end surface of the vacuum device body 1 is provided with a first conveying pipe 102, the lower end surface of the first conveying pipe 102 is provided with a planetary unloading drive 101, and the outside of the vacuum device body 1 is provided with a support rod 103.

[0051] The setting of the planetary unloading drive 101 can effectively prevent the phenomenon of internal and external gas flow during slag discharge.

[0052] Please refer to 4. A first negative pressure cavity 701 is provided inside the third external connecting cover 7, a slag discharge cavity 702 is provided inside the slag discharge pipe 203, a feed inner cavity 504 is provided inside the feed receiving mechanism 503, and a threaded conveying rod 302 is provided inside the first external connecting cover 4 and the second external connecting cover 6, and one end of the threaded conveying rod 302 passes through and extends to the inside of the third external connecting cover 7 and the first connecting shaft 10.

[0053] Example 3

[0054] See also Figures 1-9 A method for using a positive and negative pressure airflow regulating device for a rotary kiln comprises the following steps:

[0055] Step 1: Before the overall system of the positive and negative pressure airflow regulating device is used in the rotary kiln, the isolation cover 8 is installed inside the rotary kiln, and the side of the rotary kiln is sealed by the first side plate 9. Before the rotary kiln processes the powder inside, the airflow regulating plate 12 is set through experimental parameter calculation, and finally the first regulating piece 1201 and the second regulating piece 1202 on the airflow regulating plate 12 are set and fixed at a certain angle to facilitate the fixation of the positive and negative pressure gas circulation parameters;

[0056] Step 2: When the rotary kiln is in use, the upper exhaust delivery connection mechanism 104 is connected to the external exhaust mechanism, and the manual valve adjustment rod 201 is adjusted to open the inner shielding plate 205. The positive pressure atmosphere processed inside the rotary kiln enters the second negative pressure cavity 802 inside the isolation cover 8 through the airflow adjustment plate 12, and then enters the first negative pressure cavity 701 through the negative pressure distribution cavity 1001;

[0057] Step three: The gas in the first negative pressure cavity 701 is extracted through external suction. When the extracted gas is processed in the rotary kiln body, it will carry some dust particles into the first negative pressure cavity 701 as the gas is transferred. When the particles hit the side baffle, the disappearance of the kinetic potential energy will discharge the particles through the slag discharge pipe 203, and the gas will enter the exhaust device body 1 through the connecting pipe 2. The gas will follow the centrifugal mechanism inside the exhaust device body 1 to separate the gas and the remaining impurities in the gas, and the impurities can be discharged through the first conveying pipe 102.

[0058] Step 4: The planetary feeding mechanism 502 set at the feeding end of the rotary kiln can effectively avoid the problem of external gas being missed when the material enters. The planetary unloading drive 101 set at the same time can also effectively avoid the entry of external gas during unloading, and the slag discharge pipe 203 set is connected to the external sealed storage cover, which can not only prevent the entry of external gas, but also collect the slag discharge material.

[0059] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interface, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0060] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed by the present invention, or replace some of the technical features therein with equivalents. Such modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A positive and negative pressure airflow regulating device for a rotary kiln, comprising an exhaust device body (1), a main drive motor (3) and an isolation cover body (8), wherein a first external connection cover (4) is provided at one end of the main drive motor (3), a second external connection cover (6) is provided at one end of the first external connection cover (4), an annular cover (202) is provided at one end of the second external connection cover (6), a third external connection cover (7) is provided at one side of the annular cover (202), a first connecting shaft (10) is provided at one end of the third external connection cover (7), a blanking annular cover (801) is provided at one end of the first connecting shaft (10), an isolation cover body (8) is provided at one side of the blanking annular cover (801), and the isolation cover body (8) is fixedly connected to the blanking annular cover (801); It is characterized in that Also includes: A second connecting shaft (11) is mounted on one end of the isolation cover (8), a second side plate (902) is provided between the isolation cover (8) and the second connecting shaft (11), a first side plate (9) is provided between the blanking annular cover (801) and the first connecting shaft (10), an air flow adjustment plate (12) is provided inside one end of the second connecting shaft (11), the air flow adjustment plate (12) is threadedly connected to the second connecting shaft (11) through bolts (13), and the bolts (13) are provided in plurality, a fixing plate (14) is provided on one side inside the second connecting shaft (11), and the fixing plates (14) are provided in plurality, and the plurality of bolts (13) are all mounted on the fixing plate (14); A first regulating piece (1201) and a second regulating piece (1202) are installed inside the airflow regulating plate (12), wherein the first regulating piece (1201) is arranged on a circle of the outer wall of the airflow regulating plate (12), and six second regulating pieces (1202) are provided, and a plurality of the first regulating pieces (1201) and the second regulating pieces (1202) are formed integrally with the airflow regulating plate (12); A negative pressure distribution chamber (1001) is installed inside the first connecting shaft (10), and a plurality of negative pressure distribution chambers (1001) are provided. A discharge chamber (1002) is provided on the outer wall of the other end of the discharge annular cover (801), and a plurality of discharge chambers (1002) are provided. A feeding and receiving mechanism (503) is provided above the first external connection cover (4), a planetary feeding mechanism (502) is provided above the feeding and receiving mechanism (503), a driving motor (501) is provided on one side of the planetary feeding mechanism (502), and a feeding pipe (5) is provided above the planetary feeding mechanism (502); A connecting pipe (2) is provided at one end of the annular cover (202), one end of the connecting pipe (2) is mounted on one side of the air extraction device body (1), a first observation window (206) is provided on the upper end face of the connecting pipe (2), a first inner cavity (204) is provided inside the connecting pipe (2), an inner baffle (205) is provided inside the first inner cavity (204), a hand valve regulating rod (201) is provided on one side of the connecting pipe (2), and one end of the hand valve regulating rod (201) passes through and extends into the first inner cavity (204), one end of the hand valve regulating rod (201) is mounted on the inner baffle (205), and a slag discharge pipe (203) is provided on the lower end face of the annular cover (202); A first negative pressure cavity (701) is provided inside the third external connection cover (7), a slag discharge cavity (702) is provided inside the slag discharge pipe (203), a feed inner cavity (504) is provided inside the feed receiving mechanism (503), a threaded conveying rod (302) is provided inside the first external connection cover (4) and the second external connection cover (6), and one end of the threaded conveying rod (302) passes through and extends to the inside of the third external connection cover (7) and the first connecting shaft (10).

2. The positive and negative pressure airflow regulating device for a rotary kiln according to claim 1, characterized in that: A bracket frame (301) is provided on the lower end surface of the first external connection cover (4).

3. The positive and negative pressure airflow regulating device for a rotary kiln according to claim 2, characterized in that: A second observation window (901) is provided inside the first side plate (9), and the second observation window (901) is embedded and fixedly connected to the first side plate (9), and a second negative pressure cavity (802) is provided inside the isolation cover (8).

4. The positive and negative pressure airflow regulating device for a rotary kiln according to claim 3, characterized in that: The upper end surface of the air extraction device body (1) is provided with an upper air extraction and conveying connection mechanism (104), the lower end surface of the air extraction device body (1) is provided with a first conveying pipeline (102), the lower end surface of the first conveying pipeline (102) is provided with a planetary unloading drive (101), and the outside of the air extraction device body (1) is provided with a support rod (103).

5. A method for using a positive and negative pressure airflow regulating device for a rotary kiln, which is implemented based on the positive and negative pressure airflow regulating device for a rotary kiln according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: Before the overall system of the positive and negative pressure regulating airflow device is used in a rotary kiln, the isolation cover (8) is installed inside the rotary kiln, and the side of the rotary kiln is sealed by the first side plate (9). Before the rotary kiln processes the powder inside, the airflow regulating plate (12) is set through experimental parameter calculation, and finally the first regulating piece (1201) and the second regulating piece (1202) on the airflow regulating plate (12) are set and fixed at a certain angle to facilitate the fixation of the positive and negative pressure gas circulation parameters; Step 2: When the rotary kiln is in use, the upper exhaust conveying connection mechanism (104) is connected to the external exhaust mechanism, and the hand valve regulating rod (201) is adjusted to open the inner shielding plate (205). The positive pressure atmosphere processed inside the rotary kiln enters the second negative pressure cavity (802) inside the isolation cover (8) through the air flow regulating plate (12) in a small amount, and then enters the first negative pressure cavity (701) through the negative pressure distribution cavity (1001); Step 3: The gas in the first negative pressure cavity (701) is extracted by external suction. When the extracted gas is processed in the rotary kiln body, it will carry some dust particles into the first negative pressure cavity (701) along with the transfer of the gas. When the particles hit the side baffle, the kinetic potential energy disappears and the particles are discharged through the slag discharge pipe (203). The gas enters the main body of the extraction device (1) through the connecting pipe (2). The gas will separate the gas from the remaining impurities in the gas along the centrifugal mechanism inside the main body of the extraction device (1). The impurities can be discharged through the first conveying pipe (102). Step 4: The planetary feeding mechanism (502) provided at the feeding end of the rotary kiln can effectively prevent the problem of external gas being missed when the material enters. The planetary unloading drive (101) provided at the same time can also effectively prevent the entry of external gas during unloading. The slag discharge pipe (203) provided is connected to the external sealed storage cover, which can not only prevent the entry of external gas, but also collect the slag discharge material.

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