A nitrogen sealing rotary kiln with strong sealing performance

Abstract

The present invention discloses a nitrogen-sealed rotary kiln with strong sealing performance, which relates to the technical field of rotary kilns, and comprises a kiln head, wherein the inner wall of the kiln head is provided with a limiting protrusion extending radially along the kiln head, a rotating body-shaped support ring is provided at the end face of the kiln head facing the limiting protrusion, a support frame for embedding in the support ring is provided in the middle part of the kiln head, a nitrogen inlet pipe and a nitrogen outlet pipe are penetrated through the support frame, a sealing ring is provided at the end face of the kiln head facing the kiln head, a kiln head cover detachably connected to the kiln head is provided on the end face of the kiln head, and the front and rear surfaces of the sealing ring are in contact with the kiln head cover and the support ring respectively. The present invention can continuously input or output nitrogen to the kiln head while the rotary kiln is rotating, and the sealing effect on the kiln head is enhanced as the air pressure in the rotary kiln increases, and the sealing effect is good.

Description

Technical Field

[0001] The present invention relates to the technical field of rotary kilns, and in particular to a nitrogen-sealed rotary kiln with strong sealing performance. Background Technology

[0002] Rotary kiln, also known as rotary calcining kiln or rotary kiln, is a kind of building materials equipment, widely used in many production industries such as building materials, metallurgy, chemical industry, environmental protection, etc., for mechanical, physical or chemical treatment of solid materials.

[0003] The nitrogen sealed rotary kiln is a special rotary kiln equipment, which introduces nitrogen sealing technology on the basis of the rotary kiln to optimize the production environment, improve output and quality, and prevent accidents.

[0004] Existing nitrogen-sealed rotary kilns basically input nitrogen into the kiln body from the kiln tail for feeding, but the heating section of the rotary kiln is usually located near the kiln head for discharging, and the nitrogen input from the kiln tail has a poor protective effect on the heated materials. Moreover, if a large amount of nitrogen is input into the kiln body of the rotary kiln, it will cause a large sealing pressure in various parts of the kiln body. The existing kiln body structure is prone to nitrogen leakage. SUMMARY OF THE INVENTION

[0005] The purpose of the present invention is to provide a nitrogen-sealed rotary kiln with strong sealing performance, which can continuously input or output nitrogen to the kiln head while the rotary kiln is rotating, and the sealing effect on the kiln head is enhanced as the air pressure in the rotary kiln increases, and the sealing effect is good.

[0006] To solve the above technical problems, the present invention adopts the following solutions:

[0007] A rotary kiln for nitrogen sealing with strong sealing performance, including a kiln head. There are limiting protrusions extending radially along the inner wall of the kiln head. A support ring in the shape of a rotating body is arranged at the position where the limiting protrusions face the end face of the kiln head. In the middle of the kiln head, there is a support frame for embedding the support ring. The support frame is penetrated with a nitrogen inlet pipe and a nitrogen outlet pipe. A sealing ring is arranged at the position where the support ring faces the end face of the kiln head. A kiln head cover detachably connected to the kiln head is arranged on the end face of the kiln head. The front and back surfaces of the sealing ring are respectively in contact with the kiln head cover and the support ring. Solenoid valves are arranged on both the nitrogen inlet pipe and the nitrogen outlet pipe. The side of the limiting protrusion facing away from the support ring is curved, which is convenient for discharging the materials in the kiln head after the rotary kiln is heated. Both the support ring and the support frame are made of heat-resistant materials. A pressure sensor is arranged at one end of the support frame facing the inside of the kiln head. The heating and driving of the rotary kiln adopt existing technologies and will not be elaborated. Its function is that through the setting of the support ring and the support frame, during the rotation of the rotary kiln, the support ring rotates synchronously with the rotary kiln, while the support frame is fixedly connected to any support device, making the support frame and the nitrogen inlet pipe and nitrogen outlet pipe on the support frame stationary relative to the ground, so that the rotary kiln can continuously transport nitrogen into the rotary kiln from the kiln head during the rotary operation; through the setting of the nitrogen inlet pipe and the nitrogen outlet pipe, the air pressure in the kiln body can be controlled by controlling the amount of nitrogen entering and leaving the kiln head; through the setting of the limiting protrusion, the support ring, the sealing ring and the kiln head cover, when the air pressure in the kiln body is relatively high, the air pressure in the kiln body pushes the whole composed of the support ring and the support frame to move outward relative to the kiln head, making the support ring squeeze the sealing ring. After being squeezed, the sealing ring deforms in the direction of expanding the width, and at the same time expands the inner diameter and the outer diameter, further improving the sealing effect between the sealing ring and the kiln head, and the sealing effect is good.

[0008] Further, the kiln head cover is in a circular ring shape. There is an end face groove for embedding the end face of the kiln head on the kiln head cover. There are at least two connecting seats evenly distributed in a circular ring shape outside the kiln head. There are threaded holes with an axial direction parallel to the axial direction of the kiln head in the connecting seats. Through holes corresponding to the threaded holes are arranged on the kiln head cover. Locking bolts passing through the through holes and threadedly connected to the threaded holes are arranged on the kiln head cover. The end face groove is in a circular ring shape, and there is an adjustment gap between the end face groove and the end face of the kiln head. Its function is that through the setting of the connecting seats and the locking bolts, the distance between the kiln head cover and the support ring can be adjusted, so that the sealing ring between the kiln head cover and the support ring can have a good sealing effect.

[0009] Furthermore, the support ring includes a front end cover and a rear end cover, and the support frame includes a rotary plate. The outer edge of the rotary plate is located between the front end cover and the rear end cover. The front end cover is arranged on the outer side facing the kiln head, and the rear end cover is arranged on the inner side facing the kiln head. Both the front end cover and the rear end cover are circular rings. An anti-leakage ring extends from the inner edge of the front end cover towards the rear end cover. A leakage prevention groove for embedding the anti-leakage ring is provided on the rotary plate. The inner diameter of the sealing ring is smaller than the outer diameter of the rotary plate. When the support ring presses the sealing ring, the sealing ring deforms with a reduced inner diameter, increasing the contact area between the sealing ring and the front end cover, thereby increasing the pressure of the sealing ring on the front end cover, so that the anti-leakage ring tightly presses the anti-leakage groove, avoiding gas leakage through the anti-leakage groove. The rotary plate is in a rotary body shape. Its function is that through the setting of the front end cover and the rear end cover, the outer edge of the rotary plate can be clamped between the front end cover and the rear end cover, restricting the axial movement of the rotary plate along its own axis while enabling the rotary plate to rotate around its own axis.

[0010] Furthermore, at least two threaded blind holes evenly distributed around the axis of the rear end cover are provided on the rear end cover, and bolt holes corresponding to the threaded blind holes are provided on the front end cover. A counterbore is provided at one end of the bolt hole facing away from the rear end cover. It also includes a mounting bolt that threadedly connects through the bolt hole and the threaded blind hole. The nut of the mounting bolt is located in the counterbore, and the thickness of the nut of the mounting bolt is less than the depth of the counterbore. Its function is that through the setting of the threaded blind holes, while the front end cover and the rear end cover can be connected by the mounting bolts, it can prevent the gas in the kiln head from flowing out through the threaded blind holes; through the setting of the counterbore, the nut of the mounting bolt can be completely placed in the counterbore, preventing the nut of the mounting bolt from propping up the sealing ring and deforming the sealing ring to have a gap with the outer surface of the support ring.

[0011] Furthermore, a clamping groove is provided at one end of the limiting protrusion facing the support ring, and a clamping block corresponding to the clamping groove is provided at one end of the support ring facing the limiting protrusion. One end of the clamping block facing the clamping groove is spherical. Its function is that through the setting of the clamping groove and the clamping block, the support ring can rotate synchronously with the kiln head.

[0012] Furthermore, the outer wall of the sealing ring is in interference fit with the inner wall of the kiln head. A sealing ring is provided on the end surface of the sealing ring facing the support ring. The outer diameter of the sealing ring is equal to the outer diameter of the sealing ring, and the inner diameter of the sealing ring is larger than the inner diameter of the sealing ring. A sealing groove for embedding the sealing ring is provided on the support ring. Its function is that through the setting of the sealing ring, when the support ring presses the sealing ring towards the outside of the kiln head, the sealing ring has a deformation tendency of reducing the inner diameter and expanding the outer diameter, thereby completely blocking the sealing groove, that is, further blocking the gap between the support ring and the kiln head.

[0013] Further, a positioning ring is provided at one end of the sealing ring facing the kiln head cover. The outer diameter of the positioning ring is smaller than that of the sealing ring, and a positioning groove for embedding the positioning ring is provided on the kiln head cover. Its function is that through the arrangement of the positioning ring and the positioning groove, the positioning between the sealing ring and the kiln head cover can be facilitated.

[0014] Further, mounting holes for installing the nitrogen inlet pipe and the nitrogen outlet pipe are provided on the end face of the support frame facing the inside of the kiln head. The mounting holes are conical, and the inner diameter of the mounting holes gradually increases from the outside of the kiln head to the inside of the kiln head. The nitrogen inlet pipe and the nitrogen outlet pipe are both provided with gas transmission pipes on the side facing the inside of the kiln head, and the shape and size of the gas transmission pipes are the same as those of the mounting holes. Its function is that through the design of the shapes of the mounting holes and the gas transmission pipes, when the pressure inside the kiln head is relatively high, the gas transmission pipes are pressed closer to the mounting holes.

[0015] Further, a pressure-bearing ring is provided around the outside of the end of the gas transmission pipe facing the inside of the kiln head, and a pressure-bearing groove with the same shape and size as the pressure-bearing ring is provided at the end of the mounting hole facing the inside of the kiln head. Its function is that through the arrangement of the pressure-bearing ring and the pressure-bearing groove, when the pressure inside the kiln head is relatively high, the pressure-bearing ring can be closely attached to the pressure-bearing groove, enhancing the structural strength of the gas transmission pipe and preventing the gas transmission pipe from deforming.

[0016] Further, the support frame includes a connection surface provided on the side facing away from the kiln head for flange-connecting the support frame to the support device. The support device can adopt any structure that can be flange-connected to fix the support frame, and will not be elaborated here.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. Through the arrangement of the support ring and the support frame, during the rotation of the rotary kiln, the support ring rotates synchronously with the rotary kiln, while the support frame is fixedly connected to any support device, making the support frame and the nitrogen inlet pipe and the nitrogen outlet pipe on the support frame stationary relative to the ground, so that nitrogen can be continuously transported into the rotary kiln from the kiln head during the rotary operation of the rotary kiln; through the arrangement of the nitrogen inlet pipe and the nitrogen outlet pipe, the air pressure inside the kiln body can be controlled by controlling the amount of nitrogen entering and leaving the kiln head;

[0019] 2. Through the arrangement of the limit protrusion, the support ring, the sealing ring, and the kiln head cover, when the air pressure inside the kiln body is relatively high, the air pressure inside the kiln body pushes the whole formed by the support ring and the support frame to move towards the outside of the kiln head, causing the support ring to squeeze the sealing ring. After being squeezed, the sealing ring deforms in the direction of expanding the width, and at the same time expands the inner diameter and the outer diameter, further improving the sealing effect between the sealing ring and the kiln head, and the sealing effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of Embodiment 1;

[0021] Figure 2 is Figure 1Schematic enlarged structure diagram at A in the [specific context].

[0022] Reference numerals: 1, kiln head; 2, limiting projection; 3, support ring; 4, support frame; 5, nitrogen inlet pipe; 6, nitrogen outlet pipe; 7, sealing ring; 8, kiln head cover; 9, end face groove; 10, connecting seat; 11, threaded hole; 12, through hole; 13, locking bolt; 14, front end cover; 15, rear end cover; 16, rotary plate; 17, blind threaded hole; 18, bolt hole; 19, counterbore; 20, clamping groove; 21, clamping block; 22, sealing ring; 23, sealing groove; 24, positioning ring; 25, positioning groove; 26, mounting hole; 27, gas transmission pipe; 28, pressure-bearing ring; 29, connecting surface. Detailed implementation manners

[0023] The following will further elaborate on the present invention in conjunction with embodiments and the accompanying drawings. However, the implementation manners of the present invention are not limited thereto.

[0024] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this invention is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0025] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "provided with", "installed", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Embodiment 1

[0027] A rotary kiln for nitrogen sealing with strong sealing performance, as Figure 1As shown in the figure, it includes a kiln head 1. A limiting projection 2 extending radially along the kiln head 1 is provided on the inner wall of the kiln head 1. A support ring 3 in the shape of a rotating body is provided at the end face of the limiting projection 2 facing the kiln head 1. A support frame 4 for embedding into the support ring 3 is provided in the middle of the kiln head 1. A nitrogen inlet pipe 5 and a nitrogen outlet pipe 6 are penetrated through the support frame 4. A sealing ring 7 is provided at the end face of the support ring 3 facing the kiln head 1. A kiln head cover 8 detachably connected to the kiln head 1 is provided on the end face of the kiln head 1. The front and back surfaces of the sealing ring 7 are respectively in contact with the kiln head cover 8 and the support ring 3. Solenoid valves are provided on both the nitrogen inlet pipe 5 and the nitrogen outlet pipe 6. The side of the limiting projection 2 facing away from the support ring 3 is curved, which is convenient for discharging the materials in the kiln head 1 after the rotary kiln is heated. Both the support ring 3 and the support frame 4 are made of heat-resistant materials. A pressure sensor is provided at one end of the support frame 4 facing the inside of the kiln head 1. Its function is that through the settings of the support ring 3 and the support frame 4, during the rotation of the rotary kiln, the support ring 3 rotates synchronously with the rotary kiln, while the support frame 4 is fixedly connected to any support device, making the support frame 4 and the nitrogen inlet pipe 5 and the nitrogen outlet pipe 6 on the support frame 4 stationary relative to the ground, so that nitrogen can be continuously conveyed into the rotary kiln from the kiln head 1 during the rotary operation of the rotary kiln; through the settings of the nitrogen inlet pipe 5 and the nitrogen outlet pipe 6, the air pressure in the kiln body can be controlled by controlling the amount of nitrogen entering and leaving the kiln head 1; through the settings of the limiting projection 2, the support ring 3, the sealing ring 7, and the kiln head cover 8, when the air pressure in the kiln body is relatively high, the air pressure in the kiln body pushes the whole formed by the support ring 3 and the support frame 4 to move outward relative to the kiln head 1, so that the support ring 3 squeezes the sealing ring 7. After being squeezed, the sealing ring 7 deforms in the direction of expanding the width, and at the same time expands the inner diameter and the outer diameter, further improving the sealing effect between the sealing ring 7 and the kiln head 1, and the sealing effect is good.

[0028] Specifically, as Figure 1 shown in the figure, the kiln head cover 8 is in a circular ring shape. An end face groove 9 for embedding the end face of the kiln head 1 is provided on the kiln head cover 8. At least two connecting seats 10 distributed uniformly in a circular ring shape are provided outside the kiln head 1. A threaded hole 11 with an axial direction parallel to the axial direction of the kiln head 1 is provided in the connecting seat 10. A through hole 12 corresponding to the threaded hole 11 is provided on the kiln head cover 8. A locking bolt 13 penetrating through the through hole 12 and threadedly connected to the threaded hole 11 is provided on the kiln head cover 8. The end face groove 9 is in a circular ring shape, and an adjustment gap is left between the end face groove 9 and the end face of the kiln head 1. Its function is that through the settings of the connecting seat 10 and the locking bolt 13, the distance between the kiln head cover 8 and the support ring 3 can be adjusted, so that the sealing ring 7 between the kiln head cover 8 and the support ring 3 can have a better sealing effect.

[0029] Specifically, as Figure 1As shown, the support ring 3 includes a front end cover 14 and a rear end cover 15, and the support frame 4 includes a rotary plate 16. The outer edge of the rotary plate 16 is located between the front end cover 14 and the rear end cover 15. The front end cover 14 is arranged on the outer side facing the kiln head 1, and the rear end cover 15 is arranged on the inner side facing the kiln head 1. Both the front end cover 14 and the rear end cover 15 are circular rings. An anti-leakage ring extends from the inner edge of the front end cover 14 towards the rear end cover 15. An anti-leakage groove for embedding the anti-leakage ring is provided on the rotary plate 16. The inner diameter of the sealing ring 7 is smaller than the outer diameter of the rotary plate 16. When the support ring 3 presses the sealing ring 7, the sealing ring 7 undergoes a deformation with a reduced inner diameter, increasing the contact area between the sealing ring 7 and the front end cover 14, thereby increasing the pressure of the sealing ring 7 on the front end cover 14, so that the anti-leakage ring tightly presses the anti-leakage groove, preventing gas from leaking through the anti-leakage groove. The rotary plate 16 is in the shape of a rotating body. Its function is that through the arrangement of the front end cover 14 and the rear end cover 15, the outer edge of the rotary plate 16 can be clamped between the front end cover 14 and the rear end cover 15, restricting the axial movement of the rotary plate 16 along its own axis while enabling the rotary plate 16 to rotate around its own axis.

[0030] Specifically, as Figure 2 shown, at least two threaded blind holes 17 evenly distributed around the axis of the rear end cover 15 are provided on the rear end cover 15, and bolt holes 18 corresponding to the threaded blind holes 17 are provided on the front end cover 14. A counterbore 19 is provided at one end of the bolt hole 18 facing away from the rear end cover 15. It also includes mounting bolts that pass through the bolt holes 18 and are threadedly connected to the threaded blind holes 17. The nuts of the mounting bolts are located in the counterbore 19, and the thickness of the nuts of the mounting threads is smaller than the depth of the counterbore 19. Its function is that through the setting of the threaded blind holes, while the front end cover 14 and the rear end cover 15 can be connected by the mounting bolts, it can prevent the gas in the kiln head 1 from flowing out through the threaded blind holes; through the setting of the counterbore 19, the nuts of the mounting bolts can be completely placed in the counterbore 19, preventing the nuts of the mounting bolts from propping up the sealing ring 7 and causing a gap between the deformed sealing ring 7 and the outer surface of the support ring 3.

[0031] Specifically, as Figure 1 shown, a clamping groove 20 is provided at one end of the limiting protrusion 2 facing the support ring 3, and a clamping block 21 corresponding to the clamping groove 20 is provided at one end of the support ring 3 facing the limiting protrusion 2. One end of the clamping block 21 facing the clamping groove 20 is spherical. Its function is that through the setting of the clamping groove 20 and the clamping block 21, the support ring 3 can rotate synchronously with the kiln head 1.

[0032] Specifically, as Figure 1As shown, the outer wall of the sealing ring 7 is in interference fit with the inner wall of the kiln head 1. A sealing ring 22 is provided on the end face of the sealing ring 7 facing the support ring 3. The outer diameter of the sealing ring 22 is equal to the outer diameter of the sealing ring 7, and the inner diameter of the sealing ring 22 is larger than the inner diameter of the sealing ring 7. A sealing groove 23 for embedding the sealing ring 22 is provided on the support ring 3. Its function is that through the setting of the sealing ring 22, when the support ring 3 extrudes the sealing ring 7 towards the outside of the kiln head 1, the sealing ring 22 generates a deformation trend of reducing the inner diameter and expanding the outer diameter, so as to completely block the sealing groove 23, that is, further block the gap between the support ring 3 and the kiln head 1.

[0033] Specifically, as Figure 1 shown, a positioning ring 24 is provided at one end of the sealing ring 7 facing the kiln head cover 8. The outer diameter of the positioning ring 24 is smaller than the outer diameter of the sealing ring 7. A positioning groove 25 for embedding the positioning ring 24 is provided on the kiln head cover 8. Its function is that through the setting of the positioning ring 24 and the positioning groove 25, it is convenient to position the sealing ring 7 and the kiln head cover 8.

[0034] Specifically, as Figure 1 shown, an installation hole 26 for installing the nitrogen inlet pipe 5 and the nitrogen outlet pipe 6 is provided on the end face of the support frame 4 facing the inside of the kiln head 1. The installation hole 26 is conical, and the inner diameter of the installation hole 26 gradually increases from the outside of the kiln head 1 to the inside of the kiln head 1. The nitrogen inlet pipe 5 and the nitrogen outlet pipe 6 are both provided with a gas transmission pipe 27 on the side facing the inside of the kiln head 1, and the shape and size of the gas transmission pipe 27 are the same as those of the installation hole 26. Its function is that through the design of the shapes of the installation hole 26 and the gas transmission pipe 27, when the pressure inside the kiln head 1 is relatively high, the gas transmission pipe 27 fits closer to the installation hole 26.

[0035] Specifically, as Figure 1 shown, a pressure-bearing ring 28 is provided around the outer end of the gas transmission pipe 27 facing the inside of the kiln head 1. A pressure-bearing groove with the same shape and size as the pressure-bearing ring 28 is provided at the end of the installation hole 26 facing the inside of the kiln head 1. Its function is that through the setting of the pressure-bearing ring 28 and the pressure-bearing groove, when the pressure inside the kiln head 1 is relatively high, the pressure-bearing ring 28 can closely adhere to the pressure-bearing groove, enhancing the structural strength of the gas transmission pipe 27 and preventing the gas transmission pipe 27 from deforming.

[0036] Specifically, as Figure 1 shown, the support frame 4 includes a connection surface 29 provided on the side facing away from the kiln head 1 for flange-connecting the support frame 4 to the support device. The support device can adopt any structure that can be flange-connected to fix the support frame 4, and will not be elaborated here.

[0037] The working principle of this embodiment is described as follows: During the rotation of the rotary kiln, the support ring 3 rotates synchronously with the rotary kiln, while the support frame 4 is fixedly connected to any support device, making the support frame 4 and the nitrogen inlet pipe 5 and the nitrogen outlet pipe 6 on the support frame 4 stationary relative to the ground, so that nitrogen can be continuously conveyed into the rotary kiln from the kiln head 1 during the rotary operation of the rotary kiln;

[0038] When the air pressure inside the kiln body is relatively high, the air pressure inside the kiln body pushes the whole formed by the support ring 3 and the support frame 4 to move outward towards the outside of the kiln head 1, causing the support ring 3 to squeeze the sealing ring 7. After being squeezed, the sealing ring 7 deforms in the direction of expanding the width, and at the same time expands the inner diameter and the outer diameter, further improving the sealing effect between the sealing ring 7 and the kiln head 1;

[0039] After the heating is completed, separate the support frame 4 from the support device, and successively remove the locking bolts 13, the kiln head cover 8, the sealing ring 7, and the whole formed by the support ring 3 and the support frame 4, then the materials inside the kiln head 1 can be poured out.

[0040] The above is only a preferred embodiment of the present invention, and does not impose any form of limitation on the present invention. According to the technical essence of the present invention, any simple modifications, equivalent replacements, and improvements made to the above embodiments within the spirit and principle of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A nitrogen-sealing rotary kiln with strong sealing performance, comprising a kiln head (1), characterized in that: The inner wall of the kiln head (1) is provided with a limiting protrusion (2) extending radially of the kiln head (1); a rotating body-shaped support ring (3) is provided at the end surface of the limiting protrusion (2) facing the kiln head (1); a support frame (4) for embedding in the support ring (3) is provided in the middle of the kiln head (1); a nitrogen inlet pipe (5) and a nitrogen outlet pipe (6) are penetrated through the support frame (4); a sealing ring (7) is provided at the end surface of the support ring (3) facing the kiln head (1); a kiln head cover (8) detachably connected to the kiln head (1) is provided on the end surface of the kiln head (1); and the front and rear surfaces of the sealing ring (7) are in contact with the kiln head cover (8) and the support ring (3) respectively; The outer wall of the sealing ring (7) is interference-fitted with the inner wall of the kiln head (1); a sealing ring (22) is provided on the end surface of the sealing ring (7) facing the support ring (3); the outer diameter of the sealing ring (22) is equal to the outer diameter of the sealing ring (7); the inner diameter of the sealing ring (22) is larger than the inner diameter of the sealing ring (7); and a sealing groove (23) for embedding the sealing ring (22) is provided on the support ring (3). The kiln head cover (8) is in the shape of a ring, and is provided with an end face groove (9) for embedding into the end face of the kiln head (1). The kiln head (1) is provided with at least two connection seats (10) in the shape of a ring and evenly distributed. The connection seats (10) are provided with threaded holes (11) whose axial direction is parallel to the axial direction of the kiln head (1). The kiln head cover (8) is provided with through holes (12) corresponding to the threaded holes (11). The kiln head cover (8) is provided with locking bolts (13) penetrating the through holes (12) and being threadedly connected to the threaded holes (11). The support ring (3) comprises a front end cover (14) and a rear end cover (15), the support frame (4) comprises a swivel plate (16), and the outer edge of the swivel plate (16) is located between the front end cover (14) and the rear end cover (15). The rear end cover (15) is provided with at least two threaded blind holes (17) evenly distributed around the axis of the rear end cover (15), the front end cover (14) is provided with bolt holes (18) corresponding to the threaded blind holes (17), and a sink (19) is provided on one end of the bolt hole (18) facing away from the rear end cover (15).

2. A nitrogen sealing rotary kiln with strong sealing performance according to claim 1, characterized in that: The end of the limiting protrusion (2) facing the support ring (3) is provided with a clamping groove (20), and the end of the support ring (3) facing the limiting protrusion (2) is provided with a clamping block (21) corresponding to the clamping groove (20).

3. The nitrogen-sealing rotary kiln with strong sealing performance according to claim 1, characterized in that: A positioning ring (24) is provided at one end of the sealing ring (7) facing the kiln head cover (8), the outer diameter of the positioning ring (24) is smaller than the outer diameter of the sealing ring (7), and a positioning groove (25) for embedding the positioning ring (24) is provided on the kiln head cover (8).

4. The nitrogen sealing rotary kiln with strong sealing performance according to claim 1, characterized in that: The support frame (4) is provided with a mounting hole (26) for inserting a nitrogen inlet pipe (5) and a nitrogen outlet pipe (6) on its end surface facing the kiln head (1). The mounting hole (26) is conical in shape, and the inner diameter of the mounting hole (26) gradually increases from the outside of the kiln head (1) to the inside of the kiln head (1). The nitrogen inlet pipe (5) and the nitrogen outlet pipe (6) are both provided with a gas delivery pipe (27) of the same shape and size as the mounting hole (26).

5. A nitrogen sealing rotary kiln with strong sealing performance according to claim 4, characterized in that: A pressure-bearing ring (28) is provided around the end of the gas delivery pipe (27) facing the inside of the kiln head (1), and a pressure-bearing groove having the same shape and size as the pressure-bearing ring (28) is provided on the end of the mounting hole (26) facing the inside of the kiln head (1).

6. A nitrogen-sealing rotary kiln with strong sealing performance according to claim 4, characterized in that: The support frame (4) comprises a connection surface (29) provided on a side facing away from the kiln head (1) and used for flange-connecting the support frame (4) to a support device.

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