Nitrogen sealing rotary kiln with high sealing performance

Abstract

The invention discloses a nitrogen sealing rotary kiln with high sealing performance, and relates to the technical field of rotary kilns, the nitrogen sealing rotary kiln comprises a kiln head, a limiting protrusion extending in the radial direction of the kiln head is arranged on the inner wall of the kiln head, a rotary-body-shaped supporting ring is arranged at the position, facing the end face of the kiln head, of the limiting protrusion, and a supporting frame used for being embedded into the supporting ring is arranged in the middle of the interior of the kiln head. A nitrogen inlet pipe and a nitrogen outlet pipe penetrate through the supporting frame, a sealing ring is arranged at the position, facing the end face of the kiln head, of the supporting ring, a kiln head cover detachably connected with the kiln head is arranged on the end face of the kiln head, and the front face and the rear face of the sealing ring make contact with the kiln head cover and the supporting ring respectively. Nitrogen can be continuously input into or output from the kiln head while the rotary kiln rotates, the sealing effect on the kiln head is enhanced along with rising of the air pressure in the rotary kiln, and the sealing effect is good.

Description

Technical Field

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

[0002] Rotary kiln, also known as rotary calcining kiln or rotary kiln, is a kind of building materials equipment, which is 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] Nitrogen sealed rotary kiln is a special rotary kiln equipment, which introduces nitrogen sealing technology on the basis of 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 materials. However, the heating section of the rotary kiln is usually located near the kiln head for discharging materials. The nitrogen input from the kiln tail has a poor protective effect on the heated materials. 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 object 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] In order to solve the above technical problems, the present invention adopts the following solutions: A nitrogen-sealed rotary kiln with strong sealing performance 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 limiting protrusion facing the kiln head, a support frame for embedding in the support ring is provided in the middle 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 support ring 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. Electromagnetic valves are provided on both the nitrogen inlet pipe and the nitrogen outlet pipe. The limiting protrusion is curved on the side facing away from the support ring, so as to facilitate the discharge of materials in the kiln head after the rotary kiln is heated. The support ring and the support frame are both made of heat-resistant materials. An air pressure sensor is provided at one end of the support frame facing the kiln head. The heating and driving of the rotary kiln adopt existing technologies, which will not be described in detail. Its function is that, 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, and the support frame is fixedly connected to any supporting device, so that the support frame and the nitrogen inlet pipe and the nitrogen outlet pipe on the support frame are stationary relative to the ground, so that the rotary kiln can continuously transport nitrogen from the kiln head to the rotary kiln during the rotation operation; through the arrangement 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 exiting the kiln head; through the arrangement of the limiting protrusion, the support ring, the sealing ring, and the kiln head cover, when the air pressure in the kiln body is high, the air pressure in the kiln body pushes the whole composed of the support ring and the support frame to move toward the outside of the kiln head, so that the support ring squeezes the sealing ring, and the sealing ring is deformed in the direction of expanding the width after being squeezed, and at the same time, the inner diameter and the outer diameter are expanded, so as to further improve the sealing effect between the sealing ring and the kiln head, and the sealing effect is good.

[0007] Furthermore, the kiln head cover is in the shape of a ring, and is provided with an end face groove for embedding the end face of the kiln head. At least two connection seats in the shape of a ring and evenly distributed are provided outside the kiln head. A threaded hole is provided in the connection seat and is parallel to the axial direction of the kiln head. A through hole corresponding to the threaded hole is provided on the kiln head cover, and a locking bolt is provided on the kiln head cover that penetrates the through hole and is threadedly connected to the threaded hole. The end face groove is in the shape of a ring, and there is an adjustment gap between the end face groove and the end face of the kiln head. Its function is that, by setting the connection seat and the locking bolt, 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 better sealing effect.

[0008] Furthermore, the support ring includes a front cover and a rear cover, and the support frame includes a revolving plate, and the outer edge of the revolving plate is located between the front cover and the rear cover. The front cover is arranged on the side facing the outside of the kiln head, and the rear cover is arranged on the side facing the inside of the kiln head. The front cover and the rear cover are both in annular shape, and a leak-proof ring extends on the inner edge of the front cover toward the rear cover. A leak-proof groove for embedding the leak-proof ring is provided on the revolving plate, and the inner diameter of the sealing ring is smaller than the outer diameter of the revolving plate. When the support ring squeezes the sealing ring, the sealing ring undergoes a deformation of reducing the inner diameter, so that the contact area between the sealing ring and the front cover is increased, thereby increasing the pressure of the sealing ring on the front cover, so that the leak-proof ring presses the leak-proof groove tightly to prevent gas from leaking through the leak-proof groove. The revolving plate is in the shape of a rotating body. Its function is that, through the arrangement of the front cover and the rear cover, the outer edge of the revolving plate can be clamped between the front cover and the rear cover, and the revolving plate can be rotated around its own axis while limiting the revolving plate from moving along its own axial direction.

[0009] Furthermore, the rear end cover is provided with at least two threaded blind holes evenly distributed around the axis of the rear end cover, the front end cover is provided with bolt holes corresponding to the threaded blind holes, and a sink is provided on the end of the bolt hole facing away from the rear end cover. It also includes a mounting bolt that passes through the bolt hole and is threadedly connected to the threaded blind hole, the nut of the mounting bolt is located in the sink, and the thickness of the nut of the mounting thread is less than the depth of the sink. Its function is that, through the setting of the bolt blind hole, while the front end cover and the rear end cover can be connected by the mounting bolt, the gas in the kiln head can be prevented from flowing out through the bolt blind hole; through the setting of the sink, the nut of the mounting bolt can be completely placed in the sink, avoiding the nut of the mounting bolt from propping up the sealing ring, so that the sealing ring is deformed and there is a gap between the outer surface of the support ring.

[0010] Furthermore, the limiting protrusion is provided with a clamping groove at one end facing the support ring, and the supporting ring is provided with a clamping block corresponding to the clamping groove at one end facing the limiting protrusion. The clamping block is spherical at one end facing the clamping groove. Its function is to enable the supporting ring to rotate synchronously with the kiln head through the setting of the clamping groove and the clamping block.

[0011] Furthermore, the outer wall of the sealing ring is interference fit with the inner wall of the kiln head, a sealing ring is arranged on the end face 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, the inner diameter of the sealing ring is larger than the inner diameter of the sealing ring, and a sealing groove for embedding the sealing ring is arranged on the support ring. Its function is that, through the arrangement of the sealing ring, when the support ring squeezes the sealing ring toward the outside of the kiln head, the sealing ring has a deformation trend 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.

[0012] Furthermore, 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 the outer diameter of the sealing ring, and a positioning groove for embedding the positioning ring is provided on the kiln head cover. Its function is that the positioning ring and the positioning groove can facilitate the positioning between the sealing ring and the kiln head cover.

[0013] Furthermore, the end surface of the support frame facing the kiln head is provided with a mounting hole for installing a nitrogen inlet pipe and a nitrogen outlet pipe, the mounting hole is conical, and the inner diameter of the mounting hole gradually increases from the outside of the kiln head to the inside of the kiln head, and the nitrogen inlet pipe and the nitrogen outlet pipe are both provided with gas pipes of the same shape and size as the mounting holes on the side facing the inside of the kiln head. Its function is to make the gas pipe and the mounting hole stick closer when the pressure in the kiln head is high through the design of the shape of the mounting hole and the gas pipe.

[0014] Furthermore, a pressure ring is arranged around the end of the gas pipe facing the kiln head, and a pressure groove having the same shape and size as the pressure ring is arranged on the end of the mounting hole facing the kiln head. The function of the pressure ring and the pressure groove is that when the pressure in the kiln head is relatively high, the pressure ring can be closely attached to the pressure groove, thereby enhancing the structural strength of the gas pipe and preventing the gas pipe from being deformed.

[0015] Furthermore, the support frame includes a connection surface disposed on the side facing away from the kiln head for flange-connecting the support frame to the support device. The support device can be any structure that can be flange-connected to fix the support frame, and will not be described in detail.

[0016] The present invention has the beneficial effects: 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, and the support frame is fixedly connected to any supporting device, so that the support frame and the nitrogen inlet pipe and the nitrogen outlet pipe on the support frame are stationary relative to the ground, so that the rotary kiln can continuously transport nitrogen from the kiln head to the rotary kiln during the rotary work; through the arrangement 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; 2. Through the setting of the limiting protrusion, support ring, sealing ring and kiln head cover, when the air pressure in the kiln body is high, the air pressure in the kiln body pushes the support ring and the support frame to move toward the outside of the kiln head, so that the support ring squeezes 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 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

[0017] Figure 1 It is a structural schematic diagram of Example 1; Figure 2 for Figure 1 Schematic diagram of the enlarged structure at point A in the middle.

[0018] Figure numerals: 1. kiln head; 2. limiting protrusion; 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. slewing plate; 17. threaded blind hole; 18. bolt hole; 19. sinker; 20. snap-in groove; 21. snap-in block; 22. sealing ring; 23. sealing groove; 24. positioning ring; 25. positioning groove; 26. mounting hole; 27. gas pipe; 28. pressure ring; 29. ​​connecting surface. DETAILED DESCRIPTION

[0019] The present invention will be further described in detail below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0020] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inside", "outside", "front", "back", "top", "bottom" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0021] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed", "opened", "installed", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] Example 1 A nitrogen sealing rotary kiln with strong sealing performance, such as Figure 1As shown, it includes a kiln head 1, on the inner wall of the kiln head 1, a limiting protrusion 2 extending radially along the kiln head 1 is provided, and a rotating body-shaped support ring 3 is provided at the end face of the limiting protrusion 2 facing the kiln head 1, and a support frame 4 for embedding in the support ring 3 is provided in the middle of the kiln head 1, and a nitrogen inlet pipe 5 and a nitrogen outlet pipe 6 are penetrated on the support frame 4, and a sealing ring 7 is provided at the end face of the support ring 3 facing the kiln head 1, and a kiln head cover 8 detachably connected to the kiln head 1 is provided on the end face 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. Solenoid valves are provided on the nitrogen inlet pipe 5 and the nitrogen outlet pipe 6. The limiting protrusion 2 is curved on the side facing away from the support ring 3, so as to facilitate the discharge of the material in the kiln head 1 after the rotary kiln completes heating. The support ring 3 and the support frame 4 are both made of heat-resistant materials. A pressure sensor is provided at one end of the support frame 4 facing the kiln head 1. Its function is that, through the arrangement 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, and the support frame 4 is fixedly connected to any supporting device, so that the support frame 4 and the nitrogen inlet pipe 5 and the nitrogen outlet pipe 6 on the support frame 4 are stationary relative to the ground, so that the rotary kiln can continuously transport nitrogen from the kiln head 1 to the rotary kiln during the rotary operation; through the arrangement 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 exiting the kiln head 1; through the arrangement of the limiting protrusion 2, the support ring 3, the sealing ring 7, and the kiln head cover 8, when the air pressure in the kiln body is high, the air pressure in the kiln body pushes the whole formed by the support ring 3 and the support frame 4 to move toward the outside of the kiln head 1, so that the support ring 3 squeezes the sealing ring 7, and the sealing ring 7 is deformed in the direction of expanding the width after being squeezed, and at the same time expands the inner diameter and the outer diameter, so as to further improve the sealing effect between the sealing ring 7 and the kiln head 1, and the sealing effect is good.

[0023] Specifically, Figure 1 As shown, the kiln head cover 8 is in the shape of a ring, and is provided with an end face groove 9 for embedding the end face of the kiln head 1. The kiln head 1 is provided with at least two evenly distributed connection seats 10 in the shape of a ring. The connection seat 10 is provided with a threaded hole 11 whose axial direction is parallel to the axial direction of the kiln head 1. The kiln head cover 8 is provided with a through hole 12 corresponding to the threaded hole 11, and the kiln head cover 8 is provided with a locking bolt 13 that penetrates the through hole 12 and is threadedly connected to the threaded hole 11. The end face groove 9 is in the shape of a ring, and there is an adjustment gap between the end face groove 9 and the end face of the kiln head 1. Its function is that, through the setting of the connection 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.

[0024] Specifically, Figure 1As shown, the support ring 3 includes a front cover 14 and a rear cover 15, and the support frame 4 includes a revolving plate 16, and the outer edge of the revolving plate 16 is located between the front cover 14 and the rear cover 15. The front cover 14 is arranged on the side facing the outside of the kiln head 1, and the rear cover 15 is arranged on the side facing the inside of the kiln head 1. The front cover 14 and the rear cover 15 are both in annular shape, and a leakproof ring is extended on the inner edge of the front cover 14 toward the rear cover 15. The revolving plate 16 is provided with a leakproof groove for embedding the leakproof ring, and the inner diameter of the sealing ring 7 is smaller than the outer diameter of the revolving plate 16. When the support ring 3 squeezes the sealing ring 7, the sealing ring 7 is deformed to reduce its inner diameter, so that the contact area between the sealing ring 7 and the front cover 14 is increased, thereby increasing the pressure of the sealing ring 7 on the front cover 14, so that the leakproof ring is pressed against the leakproof groove to prevent gas from leaking through the leakproof groove. The revolving plate 16 is in the shape of a rotating body. Its function is that, through the setting of the front end cover 14 and the rear end cover 15, the outer edge of the rotating plate 16 can be clamped between the front end cover 14 and the rear end cover 15, while limiting the axial movement of the rotating plate 16 and enabling the rotating plate 16 to rotate around its own axis.

[0025] Specifically, Figure 2 As shown, the rear cover 15 is provided with at least two threaded blind holes 17 evenly distributed around the axis of the rear cover 15, the front cover 14 is provided with bolt holes 18 corresponding to the threaded blind holes 17, and a sink 19 is provided on the end of the bolt hole 18 facing away from the rear cover 15. It also includes a mounting bolt that passes through the bolt hole 18 and is threadedly connected to the threaded blind hole 17, the nut of the mounting bolt is located in the sink 19, and the thickness of the nut of the mounting thread is less than the depth of the sink 19. Its function is that, through the provision of the bolt blind hole, the front cover 14 and the rear cover 15 can be connected by the mounting bolt, while the gas in the kiln head 1 can be prevented from flowing out through the bolt blind hole; through the provision of the sink 19, the nut of the mounting bolt can be completely placed in the sink 19, so as to prevent the nut of the mounting bolt from supporting the sealing ring 7, so that the sealing ring 7 is deformed and there is a gap between the outer surface of the support ring 3.

[0026] Specifically, Figure 1 As shown, 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. The clamping block 21 is spherical at the end facing the clamping groove 20. Its function is to enable the support ring 3 to rotate synchronously with the kiln head 1 through the arrangement of the clamping groove 20 and the clamping block 21.

[0027] Specifically, Figure 1As shown, the outer wall of the sealing ring 7 is interference fit with the inner wall of the kiln head 1, and a sealing ring 22 is arranged 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. The support ring 3 is provided with a sealing groove 23 for embedding the sealing ring 22. Its function is that, through the arrangement of the sealing ring 22, when the support ring 3 squeezes the sealing ring 7 toward the outside of the kiln head 1, the sealing ring 22 has a deformation trend of reducing the inner diameter and expanding the outer diameter, thereby completely blocking the sealing groove 23, that is, further blocking the gap between the support ring 3 and the kiln head 1.

[0028] Specifically, Figure 1 As shown, a positioning ring 24 is provided at one end of the sealing ring 7 facing the kiln head cover 8, and the outer diameter of the positioning ring 24 is smaller than the outer diameter of the sealing ring 7. The kiln head cover 8 is provided with a positioning groove 25 for embedding the positioning ring 24. Its function is to facilitate the positioning between the sealing ring 7 and the kiln head cover 8 through the arrangement of the positioning ring 24 and the positioning groove 25.

[0029] Specifically, Figure 1 As shown, the end surface of the support frame 4 facing the inside of the kiln head 1 is provided with a mounting hole 26 for installing the nitrogen inlet pipe 5 and the nitrogen outlet pipe 6. The mounting hole 26 is conical, 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 pipe 27 with the same shape and size as the mounting hole 26 on the side facing the inside of the kiln head 1. Its function is to make the gas pipe 27 and the mounting hole 26 stick closer when the pressure in the kiln head 1 is high through the design of the shapes of the mounting hole 26 and the gas pipe 27.

[0030] Specifically, Figure 1 As shown, a pressure ring 28 is arranged around the end of the gas pipe 27 facing the kiln head 1, and a pressure groove having the same shape and size as the pressure ring 28 is arranged on the end of the mounting hole 26 facing the kiln head 1. The function is that, through the arrangement of the pressure ring 28 and the pressure groove, when the pressure in the kiln head 1 is relatively high, the pressure ring 28 can be closely attached to the pressure groove, thereby enhancing the structural strength of the gas pipe 27 and preventing the gas pipe 27 from being deformed.

[0031] Specifically, Figure 1 As 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 described in detail.

[0032] 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, and the support frame 4 is fixedly connected to any supporting device, so that the support frame 4 and the nitrogen inlet pipe 5 and the nitrogen outlet pipe 6 on the support frame 4 are stationary relative to the ground, so that the rotary kiln can continuously transport nitrogen from the kiln head 1 to the rotary kiln during the rotary operation; When the air pressure in the kiln body is high, the air pressure in the kiln body pushes the whole formed by the support ring 3 and the support frame 4 to move toward the outside of the kiln head 1, so that the support ring 3 squeezes the sealing ring 7. After being squeezed, the sealing ring 7 is deformed in the direction of expanding the width, and at the same time, the inner diameter and the outer diameter are expanded, further improving the sealing effect between the sealing ring 7 and the kiln head 1; After heating is completed, the support frame 4 is separated from the support device, and the locking bolt 13, the kiln head cover 8, the sealing ring 7, the support ring 3 and the support frame 4 are removed in sequence, so that the material in the kiln head 1 can be poured out.

[0033] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. According to the technical essence of the present invention, within the spirit and principles of the present invention, any simple modification, equivalent replacement and improvement made to the above embodiment still falls 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.

2. A nitrogen sealing rotary kiln with strong sealing performance according to claim 1, characterized in that: 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).

3. The nitrogen-sealing rotary kiln with strong sealing performance according to claim 1, characterized in that: The support ring (3) comprises a front end cover (14) and a rear end cover (15), and the support frame (4) comprises a swivel plate (16), wherein an outer edge of the swivel plate (16) is located between the front end cover (14) and the rear end cover (15).

4. A nitrogen sealing rotary kiln with strong sealing performance according to claim 3, characterized in that: 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).

5. The 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).

6. The nitrogen-sealing rotary kiln with strong sealing performance according to claim 1, characterized in that: The outer wall of the sealing ring (7) is interference fit 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).

7. 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).

8. 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).

9. A nitrogen-sealing rotary kiln with strong sealing performance according to claim 8, 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).

10. The nitrogen-sealing rotary kiln with strong sealing performance according to claim 8, 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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