Sealing device of rotary kiln and rotary kiln

Abstract

The present invention discloses a sealing device of a rotary kiln and a rotary kiln, the sealing device comprises a moving ring and a stationary ring arranged between a cylinder and a kiln cover, the two are in contact with each other and rotate relatively to form a spherical-conical end face sealing pair, the moving ring is fixed on the cylinder on the side away from the stationary ring, the stationary ring is elastically and sealedly connected to the kiln cover through a compensator, and the stationary ring is connected to an axial force component on the circular ring end face close to the kiln cover. The rotary kiln comprises the above-mentioned sealing device. The sealing device of the present invention, under the joint action of the moving ring, the stationary ring, the compensator, the rotating pair, the sliding pair and the axial force component, can realize the continuous and effective sealing of the cylinder and the kiln cover of the rotary kiln, has the advantages of simple structure, convenient use, good adaptability, high reliability, good sealing effect, long service life, etc., can be widely used in equipment such as rotary kilns, and has important promoting significance for effectively improving the sealing effect of rotary kilns and promoting the widespread use of rotary kilns.

Description

Technical Field

[0001] The invention belongs to the technical field of rotary kilns and relates to a sealing device of a rotary kiln and a rotary kiln. Background Art

[0002] The rotary kiln is a thermal equipment widely used in building materials, metallurgy, chemical industry and other industries. It is mainly used for calcination, roasting, drying, pyrolysis and so on of materials. The main parts of the rotary kiln are as follows: the cylinder is the main part of the rotary kiln, which is usually made of rolled steel plates, and sometimes lined with refractory materials inside; the supporting device includes supporting wheels and belts, which are used to support the cylinder and ensure its stable operation; the transmission device includes motors, reducers, large and small gears, etc., which are responsible for driving the rotation of the cylinder; the kiln cover includes the kiln head cover and the kiln tail cover, which are the devices at the feeding end and the discharging end to ensure that the materials can enter and exit smoothly. During the operation of the rotary kiln, the material enters from one end of the rotary kiln (usually the high end), and as the cylinder rotates slowly, it gradually moves to the other end under the action of gravity. During the movement, the material is heated by high temperature to complete physical or chemical changes, and the gas generated is discharged from the other end. Therefore, in order to prevent the overflow of gas and dust and the loss of heat, it is usually necessary to set a sealing device between the cylinder and the kiln cover.

[0003] At present, the sealing forms between the cylinder and the kiln hood of the rotary kiln usually adopt labyrinth seals, laminated seals, packing seals, etc. However, in actual applications, due to the large size of the rotary kiln, the diverse environment, complex working conditions, harsh conditions, and the strong system dependence and time-varying nature of the operation process, there will be jumping, swinging, axial movement, etc. during operation, which makes it difficult to seal the connection between the cylinder and the kiln hood. In addition, when the sealing surface of the end face sealing pair between the cylinder and the kiln hood is a plane, that is, a plane-plane end face sealing pair is formed between the cylinder and the kiln hood, although the plane-plane end face sealing pair can overcome the problems of poor sealing performance caused by vibration, swing, axial movement and the like to a certain extent, when the vibration and swing amplitude of the cylinder are large or the change speed is fast, the compensation ability of the plane-plane end face sealing pair in both axial and radial directions and the followability of the static ring are difficult to meet the requirements. As a result, the two sealing surfaces between the cylinder and the kiln hood are difficult to fit tightly, and a small gap is easily formed, resulting in leakage of the sealing pair. In particular, under the influence of factors such as cylinder vibration, swing, axial movement, etc., the two sealing surfaces of the plane-plane end face sealing pair are easily non-parallel, resulting in defects such as uneven circumferential force distribution of the sealing pair, poor contact, uneven wear, poor sealing performance, low reliability, and short service life. Therefore, how to effectively provide the compensation capability, centering and tracking performance of the sealing pair in both the axial and radial directions is of great significance for effectively improving the sealing effect between the cylinder and the kiln hood and promoting the widespread use of rotary kilns. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a rotary kiln sealing device having a simple structure, convenient use, good adaptability, high reliability, good sealing effect and long service life, and a rotary kiln including the sealing device.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A sealing device for a rotary kiln comprises a dynamic ring and a static ring, wherein the dynamic ring and the static ring contact each other and rotate relative to each other to form a spherical-conical end face sealing pair, that is, a spherical-conical end face sealing pair is formed between a cylinder and a kiln cover of the rotary kiln through the dynamic ring and the static ring contacting each other and rotating relative to each other; the dynamic ring is fixed and sealed to the cylinder on a side away from the static ring; the static ring is elastically and sealed to the kiln cover through a compensator; a rotating pair is provided in the middle of the static ring; and an axial force applying component for applying axial force to the spherical-conical end face sealing pair is connected to the static ring on a side close to the kiln cover.

[0007] As a further improvement of the above technical solution: during operation, the spherical surface is always located within the conical surface wrapping range, so that the dynamic ring and the static ring are always in contact with each other and rotate relatively to each other to form a spherical-conical end face sealing pair.

[0008] As a further improvement of the above technical solution: the moving ring is an integral moving ring or a split moving ring, and is arranged between the cylinder and the kiln cover.

[0009] As a further improvement of the above technical solution: the split moving ring is composed of at least two circular ring segments with the same inner diameter and outer diameter that are detachably overlapped or thin-layer welded.

[0010] As a further improvement of the above technical solution: the split moving ring is composed of two circular ring segments with the same inner diameter and outer diameter which are detachably overlapped or thin-layer welded.

[0011] As a further improvement of the above technical solution: the stationary ring is an integral stationary ring or a split stationary ring, and is arranged between the cylinder and the kiln cover.

[0012] As a further improvement of the above technical solution: the split static ring is composed of at least two circular ring segments with the same inner diameter and outer diameter that are detachably overlapped or thin-layer welded.

[0013] As a further improvement of the above technical solution: the split static ring is composed of two circular ring segments with the same inner diameter and outer diameter that are detachably overlapped or thin-layer welded.

[0014] As a further improvement of the above technical solution: sealant is applied to the detachable overlapping interface of the two circular ring segments with the same inner diameter and outer diameter.

[0015] As a further improvement of the above technical solution: the sealing surface of the dynamic ring is a spherical surface, and the sealing surface of the static ring is a conical surface.

[0016] As a further improvement of the above technical solution: the sealing surface of the dynamic ring is a conical surface, and the sealing surface of the static ring is a spherical surface.

[0017] As a further improvement of the above technical solution: a moving ring seat is provided between the moving ring and the cylinder body, and the moving ring is fixed and sealed to the cylinder body through the moving ring seat.

[0018] As a further improvement of the above technical solution: the moving ring is detachably connected to the moving ring seat.

[0019] As a further improvement of the above technical solution: a circumferential limit stop is provided between the moving ring and the moving ring seat.

[0020] As a further improvement of the above technical solution: a stationary ring seat is provided between the stationary ring and the compensator, and the stationary ring is fixed and sealed to the compensator through the stationary ring seat.

[0021] As a further improvement of the above technical solution: the stationary ring is detachably connected to the stationary ring seat.

[0022] As a further improvement of the above technical solution: a circumferential limit stop is provided between the stationary ring and the stationary ring seat.

[0023] As a further improvement of the above technical solution: the compensator is detachably connected to the kiln cover.

[0024] As a further improvement of the above technical solution: the number of the axial force-applying components is at least 2, and each of the axial force-applying components is connected to the circular end surface of the stationary ring seat on one side close to the kiln cover.

[0025] As a further improvement of the above technical solution: the axial force application component is any one of a hydraulic cylinder, a pneumatic cylinder, and a spring.

[0026] As a further improvement of the above technical solution: at least two oil injection holes are provided in the stationary ring, and the output end of each of the oil injection holes is distributed on the circumference of a concentric circle.

[0027] As a further improvement of the above technical solution: the output end of the oil filling hole faces the sealing surface of the spherical-conical end face sealing pair, and the input end of the oil filling hole is connected to an oil filling pump.

[0028] As a further improvement of the above technical solution: during operation, lubricant is injected into the spherical-conical end face sealing pair through the oil injection pump and the oil injection hole.

[0029] As a further improvement of the above technical solution: the output end of the oil filling hole is in the shape of a groove or a circular hole.

[0030] As a further improvement of the above technical solution: the output end of the oil filling hole is in the shape of a groove.

[0031] As a further improvement of the above technical solution: the oil injection pump is one of a gear pump, a screw pump, a plunger pump, a cam pump, a peristaltic pump, and a vane pump.

[0032] As a further improvement of the above technical solution: the lubricant is a liquid lubricant or grease.

[0033] As a further improvement of the above technical solution: when the lubricant is a liquid lubricant, the oil injection pump adopts a gear pump, a screw pump, or a plunger pump; when the lubricant is grease, the oil injection pump adopts one of a gear pump, a screw pump, a cam pump, a peristaltic pump, and a vane pump.

[0034] As a further improvement of the above technical solution: the oil filling hole passes through the stationary ring and the stationary ring seat in the axial direction of the stationary ring.

[0035] As a further improvement of the above technical solution: the output end of the oil injection hole is located in the axial direction of the stationary ring, and the input end of the oil injection hole is located in the radial direction of the stationary ring.

[0036] As a further improvement of the above technical solution: a revolving pair is provided in the middle of the stationary ring or the stationary ring seat.

[0037] As a further improvement of the above technical solution: the revolute pair is symmetrically arranged on both sides of the stationary ring seat or the stationary ring.

[0038] As a further improvement of the above technical solution: the revolving pair includes a main shaft, a bearing, and a bearing seat; the bearing is a rolling bearing, or a sliding bearing, or a spherical joint.

[0039] As a further improvement of the above technical solution: the main shaft of the rotating pair is fixedly connected to the stationary ring or the stationary ring seat.

[0040] As a further improvement of the above technical solution: the revolving pair is any one of a rolling bearing pair, a sliding bearing pair, and a spherical joint pair.

[0041] As a further improvement of the above technical solution: a sliding pair is provided below the stationary ring or the stationary ring seat, and the sliding pair is arranged on a rigid bracket or a rigid plane.

[0042] As a further improvement of the above technical solution: a connecting rod is fixedly connected to the sliding pair, and the sliding pair is fixedly connected to the rotating pair through the connecting rod; the connecting rod is fixedly connected to the bearing seat of the rotating pair.

[0043] As a further improvement of the above technical solution: the sliding pair adopts any one of a guide rail and slider combination mechanism, a roller and guide rail combination mechanism, and a linear bearing and guide rail combination mechanism.

[0044] As a further improvement of the above technical solution: the compensator is a metal expansion joint or a non-metal expansion joint.

[0045] As a further improvement of the above technical solution: the compensator is a non-metallic expansion joint.

[0046] As a general technical concept, the present invention also provides a rotary kiln, which includes the above-mentioned sealing device.

[0047] Compared with the prior art, the advantages of the present invention are:

[0048] (1) In view of the defects of the existing sealing devices such as complex structure, high cost, poor adaptability, poor reliability, poor sealing effect and short service life, the present invention creatively proposes a sealing device for a rotary kiln, wherein a dynamic ring and a static ring are arranged between the drum and the kiln cover of the rotary kiln, and the dynamic ring and the static ring contact each other and rotate relative to each other to form a spherical-conical end face sealing pair. The spherical-conical end face sealing pair is a sealing pair formed by the cooperation of a spherical surface and a conical surface. On the one hand, the spherical surface has a certain radius of curvature, has an automatic self-aligning function and an automatic centering ability, can provide better adaptability, and can automatically adjust the contact state with the conical surface. Therefore, the spherical-conical end face sealing pair formed by the cooperation of the spherical surface and the conical surface can better adapt to the axial displacement, radial runout, angular offset, coaxiality deviation, etc. during the operation of the rotary kiln, and can effectively compensate for the small gap caused by installation errors, axial movement or thermal expansion and contraction, thereby maintaining the tightness of the seal. On the other hand, the conical surface With a certain inclination angle, the cone surface can closely fit the spherical surface to form an effective sealing barrier between the two, which can generate a large contact pressure and sealing specific pressure, thereby enhancing the sealing effect of the spherical-conical end face sealing pair and realizing effective sealing between the cylinder and the kiln hood. At the same time, the sealing surface of the cone surface also helps to guide the flow of the medium and reduce the possibility of leakage. Therefore, the spherical-conical end face sealing pair formed by the use of the spherical surface and the cone surface has excellent adaptability and sealing. On this basis, a compensator and an axial force component are connected to the static ring, thereby forming a follower component with pre-tightening, compensation and buffering functions on the spherical-conical end face sealing pair. The follower component always maintains good follow-up performance, so that the static ring has excellent tracking performance for the dynamic ring, and can flexibly move in all directions to compensate for the centering deviation and angular offset of the dynamic ring and the static ring, as well as the axial displacement and radial runout of the dynamic ring, so as to ensure that the sealing surface of the sealing pair can be in continuous contact and improve the reliability of the sealing pair. The sealing device of the present invention can realize continuous and effective sealing of the cylinder body and the kiln cover of the rotary kiln, and has the advantages of simple structure, convenient use, good adaptability, high reliability, good sealing effect, long service life, etc. It is a new type of sealing device with good adaptability and excellent sealing performance, can be widely used in equipment such as rotary kilns, has high use value, and good application prospects.

[0049] (2) In the sealing device of the present invention, a sliding pair is arranged below the stationary ring or the stationary ring seat, a rotating pair is arranged in the middle of the stationary ring or the stationary ring seat, and the sliding pair and the rotating pair are connected by a connecting rod, thereby enabling the stationary ring or the stationary ring seat to slide flexibly along the axial direction, so that the stationary ring has good axial follow-up performance to adapt to the axial displacement of the stationary ring caused by the expansion and contraction of the compensator, etc., to reduce the restraint stress of related parts caused by the axial displacement, and to improve the reliability of the device. In particular, under the joint action of the moving ring, the stationary ring, the compensator, the rotating pair, the sliding pair and the axial force assembly, it is more conducive to achieving continuous and effective sealing of the drum and the kiln cover of the rotary kiln.

[0050] (3) The present invention also provides a rotary kiln. The improved sealing device of the present invention is used between the cylinder and the kiln cover, which has the following advantages: (a) better operating conditions. By setting a sealing device between the cylinder and the kiln cover, it can effectively adapt to changes in external factors and enable the rotary kiln to always maintain an excellent sealing effect, thereby effectively avoiding the overflow of gas and dust and the loss of heat, so that the rotary kiln can operate normally for a long time; (b) low energy consumption. By setting a sealing device, the sealing performance is improved, which helps to reduce heat loss and energy consumption; (c) adapt to high temperature environment. The sealing device used can better adapt to the thermal expansion effect under high temperature conditions, so that in the rotary kiln, the sealing effect is better. Leakage can also be reduced at the working temperature of the rotary kiln; (d) Less material leakage. The sealing device used can reduce the leakage of materials from the connection between the kiln cover and the cylinder, improve production efficiency and reduce environmental pollution; (e) Easy installation and maintenance. The spherical-conical end face sealing pair used can effectively reduce the accuracy requirements for the alignment of the cylinder and the kiln cover, making the installation and maintenance of the rotary kiln more convenient and easy to adjust and replace the seals; (f) Low maintenance and repair costs. The spherical-conical end face sealing pair used can effectively reduce equipment wear during the sealing friction process and effectively improve equipment reliability, thereby extending the maintenance cycle and service life of the equipment and significantly reducing the inspection and maintenance costs and downtime and production losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0052] Figure 1 This is a schematic diagram of the structure of the sealing device in Example 1 of the present invention.

[0053] Legend:

[0054] 1. Cylinder; 2. Moving ring seat; 3. Moving ring; 4. Stationary ring; 5. Connecting rod; 6. Stationary ring seat; 7. Sliding pair; 8. Rotating pair; 9. Compensator; 10. Kiln cover; 11. Axial force assembly; 12. Bolt; 13. Nut. DETAILED DESCRIPTION

[0055] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] In the description of the present invention, it should be noted that the terms "center", "up", "down", "front", "back", "left", "right", "inside", "outside", etc. 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.

[0057] Example 1

[0058] like Figure 1 As shown, the sealing device of the rotary kiln of this embodiment includes a dynamic ring 3 and a static ring 4, which are in contact with each other and rotate relative to each other to form a spherical-conical end face sealing pair, that is, a spherical-conical end face sealing pair is formed between the cylinder 1 and the kiln cover 10 of the rotary kiln through the mutual contact and relative rotation of the dynamic ring 3 and the static ring 4; the dynamic ring 3 is fixed and sealed to the cylinder 1 on the side away from the static ring 4; the static ring 4 is elastically and sealed to the kiln cover 10 through the compensator 9; the static ring 4 is connected to an axial force applying component 11 on the circular ring end face close to the kiln cover 10 for applying axial force to the spherical-conical end face sealing pair.

[0059] In the present invention, a moving ring and a stationary ring are arranged between the barrel and the kiln cover of the rotary kiln. The moving ring and the stationary ring contact each other and rotate relatively to form a spherical-conical end face sealing pair. The spherical-conical end face sealing pair is a sealing pair used in combination with a spherical surface and a conical surface. On the one hand, the spherical surface has a certain radius of curvature, has an automatic self-aligning function and an automatic centering ability, can provide better adaptability, and can automatically adjust the contact state with the conical surface. Therefore, the spherical-conical end face sealing pair formed by the use of the spherical surface and the conical surface can better adapt to the axial displacement, radial runout, angular offset, coaxiality deviation, etc. during the operation of the rotary kiln, and can effectively compensate for the small gap caused by installation errors, axial movement or thermal expansion and contraction, so as to maintain the tightness of the seal. On the other hand, the conical surface has a certain inclination angle, and the conical surface can be closely fitted with the spherical surface to form an effective seal between the two. The sealing barrier can generate a larger contact pressure and sealing specific pressure, thereby enhancing the sealing effect of the spherical-conical end face sealing pair and realizing effective sealing between the cylinder and the kiln hood. At the same time, the sealing surface of the cone also helps to guide the flow of the medium and reduce the possibility of leakage. Therefore, the spherical-conical end face sealing pair formed by the cooperation of the spherical surface and the conical surface has excellent adaptability and sealing. On this basis, a compensator and an axial force component are connected to the static ring, thereby forming a follower component with pre-tightening, compensation and buffering functions on the spherical-conical end face sealing pair. The follower component always maintains good follow-up performance, so that the static ring has excellent tracking performance for the dynamic ring, and can flexibly move in all directions to compensate for the centering deviation and angular offset of the dynamic ring and the static ring, as well as the axial displacement and radial runout of the dynamic ring, so as to ensure that the sealing surface of the sealing pair can be in continuous contact and improve the reliability of the sealing pair.

[0060] In this embodiment, the sealing surface of the dynamic ring 3 is a spherical surface, and the sealing surface of the static ring 4 is a conical surface. In another embodiment, the sealing surface of the dynamic ring 3 is a conical surface, and the sealing surface of the static ring 4 is a spherical surface.

[0061] In this embodiment, during operation, the conical surface always wraps the spherical surface, so that the dynamic ring 3 and the static ring 4 are always in contact with each other and rotate relatively, and a spherical surface-conical surface end face sealing pair is formed between the dynamic ring 3 and the static ring 4.

[0062] In this embodiment, the sealing surface of the dynamic ring 3 is a spherical surface, and the sealing surface of the static ring 4 is a conical surface, so that a spherical-conical end face sealing pair can be formed between the dynamic ring 3 and the static ring 4 .

[0063] In this embodiment, the moving ring 3 is a split moving ring, which is arranged between the drum 1 of the rotary kiln and the kiln cover 10. The split moving ring is composed of two circular ring segments with the same inner diameter and outer diameter, which can be detachably overlapped, or thinly welded, and sealant is applied to the interface of the two circular ring segments.

[0064] In this embodiment, the static ring 4 is a split static ring, which is arranged between the rotary kiln barrel 1 and the kiln cover 10. The split static ring is composed of two circular ring segments with the same inner diameter and outer diameter, which can be detachably overlapped, or thinly welded, and sealant is applied to the interface of the two circular ring segments.

[0065] In the present invention, a dynamic ring with a spherical sealing surface is called a spherical dynamic ring, and a static ring with a conical sealing surface is called a conical static ring. Alternatively, a static ring with a spherical sealing surface is called a spherical static ring, and a dynamic ring with a conical sealing surface is called a conical dynamic ring.

[0066] In this embodiment, the dynamic ring 3 and the static ring 4 are collectively referred to as sealing rings, that is, the sealing rings include the dynamic ring 3 and the static ring 4, and the sealing rings are divided into two types: integral sealing rings and split sealing rings. When the split sealing ring is used, it is not necessary to disassemble or lift the kiln cover when inspecting and repairing the sealing ring, which can greatly improve the inspection and maintenance efficiency and reduce the inspection and maintenance cost.

[0067] In another embodiment, the sealing ring is a one-piece sealing ring.

[0068] In this embodiment, a moving ring seat 2 is provided between the moving ring 3 and the cylinder body 1. The moving ring 3 is fixed and sealed to the cylinder body 1 through the moving ring seat 2. The moving ring 3 and the moving ring seat 2 are detachably connected. A circumferential limit stop is provided between the moving ring 3 and the moving ring seat 2.

[0069] In this embodiment, a threaded hole is provided on the moving ring 3, and a through hole is provided on the moving ring seat 2. The bolt 12 is passed through the through hole of the moving ring seat 2 and then screwed into the threaded hole of the moving ring 3. The nut 13 is tightened to firmly connect the moving ring 3 and the moving ring seat 2.

[0070] In the present invention, the moving ring 3 and the moving ring seat 2 are detachably connected. When the moving ring 2 needs to be replaced, there is no need to perform difficult operations such as disassembly, assembly, alignment, and fixation of the moving ring 3 and the cylinder 1. Only the moving ring 3 and the moving ring seat 2 need to be simply disassembled and assembled, which can greatly improve the inspection and maintenance efficiency and reduce the equipment life cycle cost.

[0071] In this embodiment, a stationary ring seat 6 is provided between the stationary ring 4 and the compensator 9. The stationary ring 4 is fixed and sealed to the compensator 9 through the stationary ring seat 6. The stationary ring 4 and the stationary ring seat 6 are detachably connected. A circumferential limit stop is provided between the stationary ring 4 and the stationary ring seat 6.

[0072] In this embodiment, a threaded hole is provided on the stationary ring 4, and a through hole is provided on the stationary ring seat 6. The bolt 12 is passed through the through hole of the stationary ring seat 6 and then screwed into the threaded hole of the stationary ring 4. The nut 13 is tightened to firmly connect the stationary ring 4 and the stationary ring seat 6.

[0073] In this embodiment, the compensator 9 and the kiln cover 10 are detachably connected.

[0074] In this embodiment, the number of axial force components 11 is 4, each axial force component 11 is connected to the annular end surface of the stationary ring seat 6 close to the kiln cover 10, and specifically, the axial force components 11 are evenly distributed on the annular end surface of the stationary ring seat 6.

[0075] In this embodiment, the axial force applying component 11 is a hydraulic cylinder, and the piston rod of the hydraulic cylinder is hingedly connected to the circular ring end surface of the stationary ring seat. In other embodiments, the axial force applying component 11 can use a cylinder or a spring.

[0076] In this embodiment, three oil injection holes are provided in the stationary ring 4, and the output end of each oil injection hole is distributed on the circumference of the concentric circle.

[0077] In this embodiment, the output end of the oil injection hole faces the sealing surface of the spherical-conical end face sealing pair, and the input end of the oil injection hole is connected to the oil injection pump; when in use, lubricant is injected into the sealing surface of the spherical-conical end face sealing pair through the oil injection pump and the oil injection hole.

[0078] In this embodiment, the output end of the oil injection hole is in the shape of a groove. In another embodiment, the output end of the oil injection hole is in the shape of a circular hole.

[0079] In this embodiment, the oil injection pump is a gear pump. In other embodiments, the oil injection pump may be a screw pump, a plunger pump, a cam pump, a peristaltic pump, or a vane pump.

[0080] In this embodiment, the lubricant is a liquid lubricant. In another embodiment, the lubricant is grease (ie, a semi-solid lubricant).

[0081] In the present invention, when the lubricant is a liquid lubricant, the oil injection pump adopts a gear pump, a screw pump, or a plunger pump. When the lubricant is grease, the oil injection pump adopts a gear pump, a screw pump, a cam pump, a peristaltic pump, or a vane pump.

[0082] In this embodiment, the oil injection hole passes through the stationary ring 4 and the stationary ring seat 6 in the axial direction of the stationary ring 4. In another embodiment, the output end of the oil injection hole is located in the axial direction of the stationary ring 4, and the input end of the oil injection hole is located in the radial direction of the stationary ring 4.

[0083] In this embodiment, a revolving pair 8 is provided in the middle of the stationary ring 4 , and the revolving pair 8 is symmetrically arranged on both sides of the stationary ring 4 , and the main axis of the revolving pair 8 is fixedly connected to the stationary ring 4 .

[0084] In another embodiment, a revolving pair 8 is provided in the middle of the stationary ring seat 6 , and the revolving pair 8 is symmetrically arranged on both sides of the stationary ring seat 6 , and the main axis of the revolving pair 8 is fixedly connected to the stationary ring seat 6 .

[0085] In this embodiment, the revolving pair 8 includes a main shaft, a bearing, and a bearing seat, wherein the bearing is a rolling bearing. In other embodiments, the bearing may be a sliding bearing or a spherical joint.

[0086] In this embodiment, the revolving pair 8 is a rolling bearing pair. In other embodiments, the revolving pair 8 may be a sliding bearing pair or a spherical joint pair.

[0087] In this embodiment, a sliding pair 7 is provided below the stationary ring seat 6 . In another embodiment, the sliding pair 7 may be provided below the stationary ring 4 .

[0088] In this embodiment, the sliding pair 7 is arranged on a rigid plane. In another embodiment, the sliding pair 7 is arranged on a rigid support.

[0089] In this embodiment, a connecting rod 5 is fixedly connected to the sliding pair 7 , the sliding pair 7 is connected to the rotating pair 8 through the connecting rod 5 , and the connecting rod 5 is fixedly connected to the bearing seat of the rotating pair 8 .

[0090] In this embodiment, the sliding pair 7 adopts a guide rail and a slider combination mechanism. In other embodiments, the sliding pair 7 adopts a roller and a guide rail combination mechanism, or a linear bearing and a guide rail combination mechanism.

[0091] In the present invention, a sliding pair is arranged below the stationary ring or stationary ring seat, a rotating pair is arranged in the middle of the stationary ring or stationary ring seat, and the sliding pair and the rotating pair are connected by a connecting rod, thereby enabling the stationary ring or stationary ring seat to slide flexibly along the axial direction, so that the stationary ring has good axial follow-up performance, so as to adapt to the axial displacement of the stationary ring caused by the expansion and contraction of the compensator, etc., reduce the restraint stress of related parts caused by the axial displacement, and improve the reliability of the device. In particular, under the joint action of the moving ring, stationary ring, compensator, rotating pair, sliding pair and axial force assembly, it is more conducive to achieving continuous and effective sealing of the barrel and kiln cover of the rotary kiln.

[0092] In this embodiment, the compensator 9 is a non-metallic expansion joint. In another embodiment, the compensator 9 is a metal expansion joint.

[0093] It can be seen from the above results that, compared with conventional sealing devices, the sealing device of the present invention has the following advantages: (a) Good adaptability. Under the joint action of components such as the moving ring, the stationary ring, the compensator, the rotating pair, the sliding pair and the axial force assembly, it can better adapt to the changes in axial displacement, radial runout, angular offset, coaxiality deviation and the like during the operation of the rotary kiln, as well as deformation caused by thermal expansion of components, so that the spherical-conical end face sealing pair can automatically adjust the contact state when the sealing conditions change, thereby ensuring that the cylinder and the kiln cover always maintain an excellent sealing effect; (b) Good sealing performance. Under the joint action of components such as the moving ring, the stationary ring, the compensator, the rotating pair, the sliding pair and the axial force assembly, the contact pressure of the spherical-conical end face sealing pair can be adjusted and enhanced in time. and sealing pressure ratio, thereby enhancing the sealing effect between the cylinder and the kiln hood; (c) long service life, the contact center circle diameter of the spherical-conical end face sealing pair is small, which reduces the preload required for the sealing connection and reduces the PV value of the sealing friction pair while ensuring effective sealing. At the same time, under the joint action of the moving ring, static ring, compensator, rotating pair, sliding pair and axial force component, the spherical-conical end face sealing pair can automatically adjust the contact pressure, which can reduce the wear between the sealing rings, thereby improving the reliability of the spherical-conical end face sealing pair while extending the maintenance cycle and service life of the moving ring and static ring; (d) simple structure and easy use, through the simple cooperation of the moving ring and the static ring, it can be quickly installed to form a spherical-conical end face sealing pair. Therefore, the sealing device of the present invention, under the joint action of the moving ring, the stationary ring, the compensator, the rotating pair, the sliding pair and the axial force assembly and other components, can achieve continuous and effective sealing of the cylinder and the kiln cover of the rotary kiln, and has the advantages of simple structure, convenient use, good adaptability, high reliability, good sealing effect, long service life, etc. It is a new type of sealing device with good adaptability and excellent sealing performance, which can be widely used in rotary kiln furnaces and other equipment, with high use value and good application prospects.

[0094] Example 2

[0095] A rotary kiln, specifically, a sealing device is arranged between a cylinder 1 and a kiln cover 10 of the rotary kiln.

[0096] In this embodiment, the sealing device used includes a dynamic ring 3 and a static ring 4, which contact each other and rotate relative to each other to form a spherical-conical end face sealing pair, that is, a spherical-conical end face sealing pair is formed between the cylinder 1 and the kiln cover 10 of the rotary kiln through the mutual contact and relative rotation of the dynamic ring 3 and the static ring 4; the dynamic ring 3 is fixed and sealed to the cylinder 1 on the side away from the static ring 4; the static ring 4 is elastically and sealed to the kiln cover 10 through the compensator 9; a rotating pair 8 is provided in the middle of the static ring 4; and an axial force-applying component 11 for applying axial force to the spherical-conical end face sealing pair is connected to the circular ring end face of the static ring 4 on the side close to the kiln cover 10.

[0097] In the present invention, a moving ring and a stationary ring are arranged between the barrel and the kiln cover of the rotary kiln. The moving ring and the stationary ring contact each other and rotate relatively to form a spherical-conical end face sealing pair. The spherical-conical end face sealing pair is a sealing pair used in combination with a spherical surface and a conical surface. On the one hand, the spherical surface has a certain radius of curvature, has an automatic self-aligning function and an automatic centering ability, can provide better adaptability, and can automatically adjust the contact state with the conical surface. Therefore, the spherical-conical end face sealing pair formed by the use of the spherical surface and the conical surface can better adapt to the axial displacement, radial runout, angular offset, coaxiality deviation, etc. during the operation of the rotary kiln, and can effectively compensate for the small gap caused by installation errors, axial movement or thermal expansion and contraction, so as to maintain the tightness of the seal. On the other hand, the conical surface has a certain inclination angle, and the conical surface can be closely fitted with the spherical surface to form an effective seal between the two. The sealing barrier can generate a larger contact pressure and sealing specific pressure, thereby enhancing the sealing effect of the spherical-conical end face sealing pair and realizing effective sealing between the cylinder and the kiln hood. At the same time, the sealing surface of the cone also helps to guide the flow of the medium and reduce the possibility of leakage. Therefore, the spherical-conical end face sealing pair formed by the cooperation of the spherical surface and the conical surface has excellent adaptability and sealing. On this basis, a compensator and an axial force component are connected to the static ring, thereby forming a follower component with pre-tightening, compensation and buffering functions on the spherical-conical end face sealing pair. The follower component always maintains good follow-up performance, so that the static ring has excellent tracking performance for the dynamic ring, and can flexibly move in all directions to compensate for the centering deviation and angular offset of the dynamic ring and the static ring, as well as the axial displacement and radial runout of the dynamic ring, so as to ensure that the sealing surface of the sealing pair can be in continuous contact and improve the reliability of the sealing pair.

[0098] In this embodiment, the sealing surface of the dynamic ring 3 is a spherical surface, and the sealing surface of the static ring 4 is a conical surface. In another embodiment, the sealing surface of the dynamic ring 3 is a conical surface, and the sealing surface of the static ring 4 is a spherical surface.

[0099] In this embodiment, during operation, the conical surface always wraps the spherical surface, so that the dynamic ring 3 and the static ring 4 are always in contact with each other and rotate relatively, and a spherical surface-conical surface end face sealing pair is formed between the dynamic ring 3 and the static ring 4.

[0100] In this embodiment, the sealing surface of the dynamic ring 3 is a spherical surface, and the sealing surface of the static ring 4 is a conical surface, so that a spherical-conical end face sealing pair can be formed between the dynamic ring 3 and the static ring 4 .

[0101] In this embodiment, the moving ring 3 is a split moving ring, which is arranged between the drum 1 of the rotary kiln and the kiln cover 10. The split moving ring is composed of two circular ring segments with the same inner diameter and outer diameter, which can be detachably overlapped, or thinly welded, and sealant is applied to the interface of the two circular ring segments.

[0102] In this embodiment, the static ring 4 is a split static ring, which is arranged between the rotary kiln barrel 1 and the kiln cover 10. The split static ring is composed of two circular ring segments with the same inner diameter and outer diameter, which can be detachably overlapped, or thinly welded, and sealant is applied to the interface of the two circular ring segments.

[0103] In the present invention, a dynamic ring with a spherical sealing surface is called a spherical dynamic ring, and a static ring with a conical sealing surface is called a conical static ring. Alternatively, a static ring with a spherical sealing surface is called a spherical static ring, and a dynamic ring with a conical sealing surface is called a conical dynamic ring.

[0104] In this embodiment, the static ring and the dynamic ring are collectively referred to as sealing rings, and the sealing rings are divided into integral sealing rings and split sealing rings. When the split sealing ring is used, it is not necessary to dismantle or lift the kiln cover when inspecting and repairing the sealing ring, which can greatly improve the inspection and maintenance efficiency and reduce the inspection and maintenance cost.

[0105] In another embodiment, the sealing ring is a one-piece sealing ring.

[0106] In this embodiment, a moving ring seat 2 is provided between the moving ring 3 and the cylinder body 1. The moving ring 3 is fixed and sealed to the cylinder body 1 through the moving ring seat 2. The moving ring 3 and the moving ring seat 2 are detachably connected. A circumferential limit stop is provided between the moving ring 3 and the moving ring seat 2.

[0107] In this embodiment, a threaded hole is provided on the moving ring 3, and a through hole is provided on the moving ring seat 2. The bolt 12 is passed through the through hole of the moving ring seat 2 and then screwed into the threaded hole of the moving ring 3. The nut 13 is tightened to firmly connect the moving ring 3 and the moving ring seat 2.

[0108] In the present invention, the moving ring 3 and the moving ring seat 2 are detachably connected. When the moving ring 2 needs to be replaced, there is no need to perform difficult operations such as disassembly, assembly, alignment, and fixation of the moving ring 3 and the cylinder 1. Only the moving ring 3 and the moving ring seat 2 need to be simply disassembled and assembled, which can greatly improve the inspection and maintenance efficiency and reduce the equipment life cycle cost.

[0109] In this embodiment, a stationary ring seat 6 is provided between the stationary ring 4 and the compensator 9. The stationary ring 4 is fixed and sealed to the compensator 9 through the stationary ring seat 6. The stationary ring 4 and the stationary ring seat 6 are detachably connected. A circumferential limit stop is provided between the stationary ring 4 and the stationary ring seat 6.

[0110] In this embodiment, a threaded hole is provided on the stationary ring 4, and a through hole is provided on the stationary ring seat 6. The bolt 12 is passed through the through hole of the stationary ring seat 6 and then screwed into the threaded hole of the stationary ring 4. The nut 13 is tightened to firmly connect the stationary ring 4 and the stationary ring seat 6.

[0111] In this embodiment, the compensator 9 and the kiln cover 10 are detachably connected.

[0112] In this embodiment, the number of axial force components 11 is 4, each axial force component 11 is connected to the annular end surface of the stationary ring seat 6 close to the kiln cover 10, and specifically, the axial force components 11 are evenly distributed on the annular end surface of the stationary ring seat 6.

[0113] In this embodiment, the axial force applying component 11 is a hydraulic cylinder, and the piston rod of the hydraulic cylinder is hingedly connected to the circular ring end surface of the stationary ring seat. In other embodiments, the axial force applying component 11 can use a cylinder or a spring.

[0114] In this embodiment, three oil injection holes are provided in the stationary ring 4, and the output end of each oil injection hole is distributed on the circumference of the concentric circle.

[0115] In this embodiment, the output end of the oil injection hole faces the sealing surface of the spherical-conical end face sealing pair, and the input end of the oil injection hole is connected to the oil injection pump; when in use, lubricant is injected into the sealing surface of the spherical-conical end face sealing pair through the oil injection pump and the oil injection hole.

[0116] In this embodiment, the output end of the oil injection hole is in the shape of a groove. In another embodiment, the output end of the oil injection hole is in the shape of a circular hole.

[0117] In this embodiment, the oil injection pump is a gear pump. In other embodiments, the oil injection pump may be a screw pump, a plunger pump, a cam pump, a peristaltic pump, or a vane pump.

[0118] In this embodiment, the lubricant is a liquid lubricant. In another embodiment, the lubricant is grease (ie, a semi-solid lubricant).

[0119] In the present invention, when the lubricant is a liquid lubricant, the oil injection pump adopts a gear pump, a screw pump, or a plunger pump. When the lubricant is grease, the oil injection pump adopts a gear pump, a screw pump, a cam pump, a peristaltic pump, or a vane pump.

[0120] In this embodiment, the oil injection hole passes through the stationary ring 4 and the stationary ring seat 6 in the axial direction of the stationary ring 4. In another embodiment, the output end of the oil injection hole is located in the axial direction of the stationary ring 4, and the input end of the oil injection hole is located in the radial direction of the stationary ring 4.

[0121] In this embodiment, a revolving pair 8 is provided in the middle of the stationary ring 4 , and the revolving pair 8 is symmetrically arranged on both sides of the stationary ring 4 , and the main axis of the revolving pair 8 is fixedly connected to the stationary ring 4 .

[0122] In another embodiment, a revolving pair 8 is provided in the middle of the stationary ring seat 6 , and the revolving pair 8 is symmetrically arranged on both sides of the stationary ring seat 6 , and the main axis of the revolving pair 8 is fixedly connected to the stationary ring seat 6 .

[0123] In this embodiment, the revolving pair 8 includes a main shaft, a bearing, and a bearing seat, wherein the bearing is a rolling bearing. In other embodiments, the bearing may be a sliding bearing or a spherical joint.

[0124] In this embodiment, the revolving pair 8 is a rolling bearing pair. In other embodiments, the revolving pair 8 may be a sliding bearing pair or a spherical joint pair.

[0125] In this embodiment, a sliding pair 7 is provided below the stationary ring seat 6 . In another embodiment, the sliding pair 7 may be provided below the stationary ring 4 .

[0126] In this embodiment, the sliding pair 7 is arranged on a rigid plane. In another embodiment, the sliding pair 7 is arranged on a rigid support.

[0127] In this embodiment, a connecting rod 5 is fixedly connected to the sliding pair 7 , the sliding pair 7 is connected to the rotating pair 8 through the connecting rod 5 , and the connecting rod 5 is fixedly connected to the bearing seat of the rotating pair 8 .

[0128] In this embodiment, the sliding pair 7 adopts a guide rail and a slider combination mechanism. In other embodiments, the sliding pair 7 adopts a roller and a guide rail combination mechanism, or a linear bearing and a guide rail combination mechanism.

[0129] In the present invention, a sliding pair is arranged below the stationary ring or stationary ring seat, a rotating pair is arranged in the middle of the stationary ring or stationary ring seat, and the sliding pair and the rotating pair are connected by a connecting rod, thereby enabling the stationary ring or stationary ring seat to slide flexibly along the axial direction, so that the stationary ring has good axial follow-up performance, so as to adapt to the axial displacement of the stationary ring caused by the expansion and contraction of the compensator, etc., reduce the restraint stress of related parts caused by the axial displacement, and improve the reliability of the device. In particular, under the joint action of the moving ring, stationary ring, compensator, rotating pair, sliding pair and axial force assembly, it is more conducive to achieving continuous and effective sealing of the barrel and kiln cover of the rotary kiln.

[0130] In this embodiment, the compensator 9 is a non-metallic expansion joint. In another embodiment, the compensator 9 is a metal expansion joint.

[0131] It can be seen from the above results that, compared with conventional rotary kilns, the improved sealing device provided between the cylinder and the kiln hood of the rotary kiln in the present invention makes the rotary kiln have the following advantages: (a) better operating conditions. By providing a sealing device between the cylinder and the kiln hood, it can effectively adapt to changes in external factors and enable the rotary kiln to always maintain an excellent sealing effect, thereby effectively avoiding the overflow of gas and dust and the loss of heat, so that the rotary kiln can operate normally for a long time; (b) low energy consumption. By providing a sealing device, the sealing performance is improved, which helps to reduce heat loss and reduce energy consumption; (c) adapt to high temperature environments. The sealing device used can better adapt to the thermal expansion effect under high temperature conditions. , thus reducing leakage at the operating temperature of the rotary kiln; (d) less material leakage, the sealing device used can reduce material leakage from the connection between the kiln cover and the cylinder, improve production efficiency and reduce environmental pollution; (e) easy installation and maintenance, the spherical-conical end face sealing pair used can effectively reduce the accuracy requirements for the alignment of the cylinder and the kiln cover, making the installation and maintenance of the rotary kiln more convenient and easy to adjust and replace the seals; (f) low maintenance and repair costs, the spherical-conical end face sealing pair used can effectively reduce equipment wear during the sealing friction process, and effectively improve equipment reliability, thereby extending the maintenance cycle and service life of the equipment, and significantly reducing the inspection and maintenance costs and downtime and production losses.

[0132] The above embodiments are only preferred implementations of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A sealing device for a rotary kiln, characterized in that: The invention comprises a moving ring (3) and a stationary ring (4), wherein the moving ring (3) and the stationary ring (4) are in contact with each other and rotate relative to each other to form a spherical-conical end face sealing pair; a moving ring seat (2) is provided between the moving ring (3) and the cylinder (1), wherein the moving ring (3) and the moving ring seat (2) are detachably connected, and the moving ring (3) is fixed and sealed to the cylinder (1) through the moving ring seat (2) on the side away from the stationary ring (4); the stationary ring (4) is elastically and sealingly connected to the kiln cover (10) through a compensator (9), and a stationary ring seat is provided between the stationary ring (4) and the compensator (9). (6), the stationary ring (4) is fixed and sealed to the compensator (9) through the stationary ring seat (6), the stationary ring (4) is detachably connected to the stationary ring seat (6), and the compensator (9) is detachably connected to the kiln cover (10); the stationary ring seat (6) is connected to an axial force-applying component (11) on the circular end face close to the kiln cover (10) for applying axial force to the spherical-conical end face sealing pair, and the number of the axial force-applying components (11) is at least 2; the axial force-applying component (11) is any one of a hydraulic cylinder, a pneumatic cylinder, and a spring.

2. The sealing device according to claim 1, characterized in that: The sealing surface of the moving ring (3) is a spherical surface, and the sealing surface of the stationary ring (4) is a conical surface; or, the sealing surface of the moving ring (3) is a conical surface, and the sealing surface of the stationary ring (4) is a spherical surface; during operation, the spherical surface is always located within the range of the conical surface, so that the moving ring (3) and the stationary ring (4) are always in contact with each other and rotate relative to each other to form a spherical-conical end face sealing pair.

3. The sealing device according to claim 2, characterized in that: The moving ring (3) is an integral moving ring or a split moving ring; the split moving ring is composed of at least two circular ring segments with the same inner diameter and outer diameter, which are detachably overlapped or thin-layer welded; the stationary ring (4) is an integral stationary ring or a split stationary ring; the split stationary ring is composed of at least two circular ring segments with the same inner diameter and outer diameter, which are detachably overlapped or thin-layer welded.

4. The sealing device according to claim 3, characterized in that: At least two oil injection holes are provided in the stationary ring (4), and the output end of each oil injection hole is distributed on the circumference of a concentric circle; the output end of the oil injection hole faces the sealing surface of the spherical-conical end face sealing pair, and the input end of the oil injection hole is connected to an oil injection pump; during operation, lubricant is injected into the spherical-conical end face sealing pair through the oil injection pump and the oil injection hole; the output end of the oil injection hole is in the shape of a groove or a circular hole; The oil injection hole penetrates the stationary ring (4) and the stationary ring seat (6) in the axial direction of the stationary ring (4), or the output end of the oil injection hole is located in the axial direction of the stationary ring (4), and the input end of the oil injection hole is located in the radial direction of the stationary ring (4).

5. The sealing device according to claim 4, characterized in that: A revolving pair (8) is provided in the middle of the stationary ring (4) or the stationary ring seat (6); the revolving pair (8) is symmetrically arranged on both sides of the stationary ring seat (6) or the stationary ring (4); the main axis of the revolving pair (8) is fixedly connected to the stationary ring (4) or the stationary ring seat (6); the revolving pair (8) is any one of a rolling bearing pair, a sliding bearing pair, and a spherical joint pair.

6. The sealing device according to claim 5, characterized in that: A sliding pair (7) is provided below the stationary ring (4) or the stationary ring seat (6); the sliding pair (7) is arranged on a rigid bracket or a rigid plane; the sliding pair (7) is fixedly connected to the rotating pair (8) via a connecting rod (5); the connecting rod (5) is fixedly connected to the bearing seat of the rotating pair (8); the sliding pair (7) adopts any one of a guide rail and slider combination mechanism, a roller and guide rail combination mechanism, and a linear bearing and guide rail combination mechanism.

7. The sealing device according to any one of claims 1 to 6, characterized in that: The compensator (9) is a metal expansion joint or a non-metal expansion joint.

8. A rotary kiln, characterized in that: The rotary kiln comprises the sealing device according to any one of claims 1 to 7.

Images