Dynamic and static sealing device of cracking kettle

Abstract

The utility model provides a dynamic and static sealing device of a cracking kettle, which belongs to the technical field of cracking kettle sealing and comprises an expansion joint, a static ring, a moving ring and a plurality of locking mechanisms. The static ring is coaxially fixed to one side of the expansion joint, and the movable ring is coaxially connected to the side, away from the expansion joint, of the static ring in an abutting mode. The locking mechanisms are evenly distributed in the circumferential direction of the movable ring, one ends of the locking mechanisms are connected to the static ring and / or the expansion joint, and the other ends of the locking mechanisms abut against the side, away from the static ring, of the movable ring and make rolling contact with the movable ring. The technical problems that in the prior art, due to the fact that pretightening force of an expansion joint declines or abrasion between the movable ring and the static ring is serious, gaps exist in sealing faces of the movable ring and the static ring, and high-temperature oil steam leaks are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of cracking kettle sealing, and particularly relates to a dynamic and static sealing device for a cracking kettle. Background Art

[0002] In the process of modern waste tire recycling and treatment, the continuous thermal cracking technology of waste rubber and plastics is one of the widely used processes. This technology utilizes the thermal instability of organic matter in solid waste, and under the conditions of oxygen deficiency and high temperature, through the combined action of decomposition and condensation, large-molecule organic matter is converted into gaseous, liquid and solid components with relatively small molecular weights, realizing the resource recycling of waste tires. This process not only reduces the environmental pressure and pollution, but also realizes the recycling of resources. However, the current thermal cracking process still faces some technical challenges.

[0003] During the thermal cracking process, the cracking kettle is filled with high-temperature oil vapor that is flammable and explosive. Maintaining the good sealing performance of the dynamic and static rings is the key to ensuring safe production. Sealing rings with dynamic and static cooperation are usually arranged at the feeding end and discharging end of the reaction kettle to prevent the leakage of flammable and explosive pyrolysis gas. However, due to the continuous rotation of the cracking kettle, the mating surface of the dynamic and static rings will be worn due to long-term use, and at the same time, the pre-tightening force of the expansion joint in the high-temperature environment will also decline over time. This wear and the decline of the pre-tightening force will cause gaps to appear on the dynamic and static sealing surfaces, resulting in the overflow of high-temperature oil vapor and the intrusion of external cold air, and there are serious potential safety hazards in the production process.

[0004] In the existing dynamic and static sealing devices, the dynamic ring is usually welded to the kettle body so that the dynamic ring rotates with the kettle body, while the static ring is fixed on the expansion joint, and the expansion joint is connected and fixed to the rear chamber; the kettle body relies on the pre-tightening force of the expansion joint to fit the friction surfaces of the dynamic and static rings together to achieve the sealing effect. However, due to being in a high-temperature environment for a long time, the pre-tightening force of the expansion joint will gradually decline and is not sufficient to support the thermal elongation of the kettle body, resulting in gaps appearing on the mating surface of the dynamic and static rings and the sealing performance becoming unstable. This not only increases the maintenance cost but also brings potential production safety hazards. Therefore, the existing technology has significant deficiencies in maintaining the sealing and safety of the cracking kettle and urgently needs to be improved. Summary of the Utility Model

[0005] The details of one or more embodiments of the utility model are presented in the following drawings and description to make other features, purposes and advantages of the present application more concise and understandable.

[0006] The present utility model provides a dynamic and static sealing device for a cracking kettle. The present utility model solves the technical problems in the prior art that due to the decline of the pre-tightening force of the expansion joint or severe wear between the dynamic and static rings, gaps appear in the sealing surfaces of the dynamic and static rings, and high-temperature oil vapor leaks. It has the characteristics that it can not only greatly improve the sealing performance between the dynamic and static rings, but also greatly improve the adaptability of the device under complex working conditions.

[0007] The present utility model discloses a dynamic and static sealing device for a cracking kettle, which includes an expansion joint, a static ring, a dynamic ring and a plurality of locking mechanisms; the static ring is coaxially fixed on one side of the expansion joint, and the dynamic ring is coaxially abutted on the side of the static ring away from the expansion joint; the locking mechanisms are evenly distributed along the circumferential direction of the dynamic ring, one end of the locking mechanism is connected to the static ring and / or the expansion joint, and the other end abuts on the side of the dynamic ring away from the static ring and is in rolling contact with the dynamic ring.

[0008] In some embodiments, the locking mechanism includes a plurality of bolts and a limiting wheel set. The bolts pass through the expansion joint and the static ring and fixedly connect the expansion joint and the static ring; the limiting wheel set is sleeved on one end of the plurality of bolts away from the expansion joint. The limiting wheel set includes a limiting wheel and a limiting plate. The limiting wheel is arranged on the limiting plate, and the limiting wheel abuts against the dynamic ring.

[0009] In some embodiments, the limiting plate is sleeved on the plurality of bolts, and a notch is formed on the limiting plate. The limiting wheel is arranged in the notch and rotates in the notch at least during operation.

[0010] In some embodiments, the limiting wheel set further includes two fixing seats and a wheel shaft. The two fixing seats are respectively arranged on the upper and lower sides of the notch; both ends of the wheel shaft are respectively inserted into the two fixing seats, the limiting wheel is sleeved on the wheel shaft, and the limiting wheel rotates self-rotation in the notch around the wheel shaft.

[0011] In some embodiments, the limiting wheel set further includes a plurality of bearings. The plurality of bearings are arranged at intervals along the axial direction of the wheel shaft, and the bearings are sleeved between the wheel shaft and the limiting wheel.

[0012] In some embodiments, the limiting wheel set further includes a spacer sleeve. The spacer sleeve is sleeved on the wheel shaft and arranged between adjacent two bearings.

[0013] In some embodiments, the limiting wheel set further includes a compression sleeve. The compression sleeve is sleeved on the wheel shaft and arranged between the fixing seat and the bearing.

[0014] In some of these embodiments, the locking mechanism further includes a first elastic member sleeved on one end of the bolt away from the limiting plate. One end of the first elastic member abuts against the limiting plate, and a fastener is provided at the other end of the first elastic member. The fastener and the limiting plate pre-compress the first elastic member.

[0015] In some of these embodiments, a fastener fixedly connected to the bolt abuts against one end of the stationary ring away from the expansion joint, and a fastener fixedly connected to the bolt abuts against one end of the limiting plate away from the first elastic member.

[0016] In some of these embodiments, the dynamic and static sealing device of the cracking kettle further includes a plurality of tensioning mechanisms distributed circumferentially along the expansion joint. The tensioning mechanism includes a screw rod and a second elastic member. The screw rod passes through the flanges at both ends of the expansion joint; the second elastic member is sleeved on the screw rod and is arranged between the flanges at both ends of the expansion joint.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0018] 1. The present utility model discloses a dynamic and static sealing device for a cracking kettle, which realizes an efficient and stable sealing effect. Through the close cooperation of the expansion joint, the dynamic ring and the static ring, and the action of the locking mechanism evenly distributed circumferentially along the dynamic ring, the sealing performance between the dynamic and static rings is further improved. The locking mechanism can make the dynamic ring and the static ring in close contact, effectively preventing the phenomenon of gaps between the dynamic and static rings caused by the failure of the expansion joint. Through the design of the locking mechanism, it further ensures the long-term stable operation of the cracking kettle under harsh conditions such as high temperature and high pressure; the present utility model solves many deficiencies in the prior art, not only greatly improving the sealing performance of the cracking kettle, but also significantly improving the adaptability of the equipment under complex working conditions. This device has significant beneficial effects in reducing seal leakage, extending service life, and reducing operating costs.

[0019] 2. The locking mechanism in the present utility model solves the technical problem of poor sealing at the joint between the dynamic and static rings by setting a limiting wheel set, and the limiting wheels in the limiting wheel set always abut against the dynamic ring and can rotate smoothly and freely in the notch during the rotation of the dynamic ring with the cracking kettle. It also avoids the problem of seal failure caused by the shaking, offset or wear of the dynamic ring resulting in gaps, thereby greatly improving the reliability and service life of the equipment.

[0020] 3. The present utility model introduces a combined design of multiple bearings and spacer sleeves in the limit wheel set. This design can significantly reduce the frictional resistance during the rotation of the limit wheel, reduce the decrease in sealing performance caused by wear, and at the same time improve the operating efficiency and stability of the system. The setting of the compression sleeve plays a further role in fixing and protecting in the limit wheel set, and also plays a buffering role, reducing the impact of vibration on the bearings and enhancing the stability and operating life of the entire limit wheel set.

[0021] 4. The present utility model enhances the flexible adjustment ability of the connection between the expansion joint and the static and dynamic rings by introducing the first elastic member and the tensioning mechanism. Through the pre-compression design of the first elastic member, the locking mechanism realizes self-adaptive adjustment in different environments, further optimizing the sealing effect. The tensioning mechanism, through the cooperation of the screw and the second elastic member, enables the expansion joint to automatically adjust the tension force when the temperature or pressure changes, so as to adapt to the expansion or contraction of the cracking kettle, prevent gaps from being generated at the static and dynamic joint due to uneven stress, and further improve the sealing performance between the static and dynamic rings. Brief Description of the Drawings

[0022] The drawings described herein are used to provide a further understanding of the present utility model and form a part of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation of the present utility model. In the drawings:

[0023] Figure 1 is a schematic structural diagram of the static and dynamic sealing device of the cracking kettle provided by the embodiment of the present utility model;

[0024] Figure 2 is a schematic structural diagram of the locking mechanism provided by the embodiment of the present utility model;

[0025] Figure 3 is a cross-sectional view of the limit wheel set provided by the embodiment of the present utility model;

[0026] In the above figures: 1 - expansion joint; 2 - static ring; 3 - dynamic ring; 4 - locking mechanism; 41 - bolt; 42 - limit wheel set; 421 - limit plate; 4211 - notch; 422 - limit wheel; 423 - fixed seat; 424 - wheel shaft; 425 - bearing; 426 - spacer sleeve; 427 - compression sleeve; 43 - first elastic member; 44 - fastener; 5 - tensioning mechanism; 51 - second elastic member; 52 - screw. Detailed Description of the Preferred Embodiment

[0027] In order to make the purpose, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be described and explained below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model. Based on the embodiments provided by the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0028] The present utility model provides a static and dynamic sealing device for a cracking kettle. Referring to Figures 1 to 3 as shown, it at least includes an expansion joint 1, a static ring 2, a dynamic ring 3 and a plurality of locking mechanisms 4; the static ring 2 is coaxially fixed on one side of the expansion joint 1, and the dynamic ring 3 is coaxially abutted on the side of the static ring 2 away from the expansion joint 1; the locking mechanisms 4 are evenly distributed along the circumference of the dynamic ring 3, one end of the locking mechanism 4 is connected to the static ring 2 and / or the expansion joint 1, and the other end abuts on the side of the dynamic ring 3 away from the static ring 2 and is in rolling contact with the dynamic ring 3. The static and dynamic sealing device of the cracking kettle realizes the function of static and dynamic sealing through the coaxial abutment of the dynamic ring 3 and the static ring 2. The expansion joint 1 can absorb the displacement or vibration generated during the operation of the cracking kettle and maintain the sealing performance of the whole device; the locking mechanism 4 is always in contact with the dynamic ring 3, which can make the dynamic ring 3 always closely fit with the static ring 2 during the rotation of the cracking kettle body, greatly improving the sealing performance between the dynamic ring 3 and the static ring 2; therefore, while improving the sealing performance of the whole device, the operation stability and reliability of the system are also ensured, and the service life and operation efficiency of the device are improved.

[0029] Furthermore, the locking mechanism 4 includes a plurality of bolts 41 and a limiting wheel set 42. The plurality of bolts 41 pass through the expansion joint 1 and the static ring 2 and fixedly connect the expansion joint 1 and the static ring 2; the limiting wheel set 42 is sleeved on one end of the plurality of bolts 41 away from the expansion joint 1. The limiting wheel set 42 includes a limiting wheel 422 and a limiting plate 421. The limiting wheel 422 is arranged on the limiting plate 421, and the limiting wheel 422 abuts against the dynamic ring 3. By setting the limiting wheel 422, the contact between the limiting wheel 422 and the dynamic ring 3 is rolling contact, which can effectively reduce the friction between the limiting wheel 422 and the dynamic ring 3, and greatly improve the service life and operation efficiency of the sealing device.

[0030] In some embodiments, such as Figure 2As shown in the figure, in order to further enhance the pressing effect of the limiting wheel 422 on the moving ring 3, two limiting wheels 422 can be installed on the limiting plate 421. This design can ensure that the moving ring 3 is supported evenly and stably during rotation, thereby improving the sealing effect between the moving ring 3 and the static ring 2. Specifically, the two limiting wheels 422 are respectively installed at different positions on the limiting plate 421 so that they can contact the moving ring 3 simultaneously. By increasing the number of the limiting wheels 422, the pressing force on the moving ring 3 can be evenly distributed, reducing the load and wear of a single limiting wheel 422, thereby improving the durability of the limiting wheel set 42 and the operating stability of the overall device. Among them, the number and position of the limiting wheels 422 can be adjusted according to the actual operating conditions. For example, in the case of bearing greater vibration or higher rotational speed, the number of the limiting wheels 422 can be increased to provide stronger supporting force and higher operating smoothness. This flexible design can adapt to different working conditions and helps to maintain the long-term reliable operation of the dynamic and static sealing device of the cracking kettle.

[0031] Furthermore, the limiting plate 421 is penetrated by a plurality of bolts 41. A notch 4211 is formed on the limiting plate 421. The limiting wheel 422 is arranged in the notch 4211, and at least during operation, the limiting wheel 422 can rotate in the notch 4211. Forming the notch 4211 on the limiting plate 421 can be used to accommodate the limiting wheel 422, and the limiting wheel 422 can rotate flexibly in the notch 4211. Since the flexible and free rotation of the limiting wheel 422 in the notch 4211 reduces the friction with the moving ring 3, the service life is prolonged. At the same time, the fixed design of the limiting plate 421 enhances the structural stability, enabling the sealing device to maintain good sealing performance and reliability in a high-intensity use environment.

[0032] Furthermore, the limiting wheel set 42 further includes two fixing seats 423, which are respectively arranged on the upper and lower sides of the notch 4211; both ends of the wheel shaft 424 are respectively inserted into the two fixing seats 423, and the limiting wheel 422 is sleeved on the wheel shaft 424 and can rotate around the wheel shaft 424 within the notch 4211. The two fixing seats 423 arranged on the upper and lower sides of the notch 4211 provide stable support for the wheel shaft 424. The limiting wheel 422 is sleeved on the wheel shaft 424, and through the combination of the wheel shaft 424 and the fixing seat 423, it is ensured that the limiting wheel 422 can rotate within the notch 4211. The design of the fixing seat 423 ensures the stability of the limiting wheel set 42 and effectively prevents the limiting wheel 422 from falling off or shifting during movement. This structural design greatly improves the stability of the limiting wheel set 42, makes the rotation of the limiting wheel 422 smoother, thereby reducing the friction and wear between the moving ring 3 and the limiting wheel 422. Through the support of the fixing seat 423, the overall service life of the limiting wheel set 42 is improved, and the reliability and durability of the sealing device are further enhanced. In addition, the smooth rotation of the limiting wheel 422 within the notch 4211 helps to reduce energy loss and improve the working efficiency of the device.

[0033] Furthermore, the limiting wheel set 42 further includes a plurality of bearings 425, and the plurality of bearings 425 are arranged at intervals along the axial direction of the wheel shaft 424, and the bearings 425 are sleeved between the wheel shaft 424 and the limiting wheel 422. A plurality of bearings 425 are added to the limiting wheel set 42. The bearings 425 are evenly distributed in the axial direction of the wheel shaft 424 and are installed between the wheel shaft 424 and the limiting wheel 422. The design of the bearings 425 allows the limiting wheel 422 to rotate more smoothly on the wheel shaft 424, while reducing the frictional resistance between the bearings 425 and the wheel shaft 424 and the limiting wheel 422. Through the rolling action of the bearings 425, the contact friction between the limiting wheel 422 and the wheel shaft 424 is greatly reduced, thereby improving the rotation efficiency and stability of the limiting wheel 422. This design significantly improves the rotation performance of the limiting wheel 422, reduces the frictional loss during the operation of the device, and extends the service life of the bearings 425 and the limiting wheel 422. The spaced arrangement of the bearings 425 ensures the balance of the limiting wheel 422 during rotation, thereby avoiding problems such as vibration or offset caused by uneven rotation. This optimization enables the device to maintain an efficient and stable sealing effect under high-frequency operating conditions while reducing the maintenance cost.

[0034] In some embodiments, the type of the bearing 425 can be selected from different forms such as ball bearings, needle bearings or thrust bearings to meet different load and rotational speed requirements; the number and spacing of the bearings 425 can also be adjusted according to the actual usage needs to optimize the running smoothness of the limit wheel 422 and the overall performance of the device. In addition, auxiliary components such as lubricating grease or sealing rings can be used to further reduce friction and prevent external impurities from entering the interior of the bearing 425, ensuring the long-term stable operation of the limit wheel set 42.

[0035] Furthermore, the limit wheel set 42 further includes a spacer sleeve 426, and the spacer sleeve 426 is sleeved on the axle 424 and disposed between two adjacent bearings 425. By providing the spacer sleeve 426, a certain spacing is maintained between multiple bearings 425, thereby preventing the bearings 425 from axially displacing or interfering with each other. The spacer sleeve 426 not only ensures the uniform distribution of the bearings 425, but also provides additional support and stability, reduces the friction and wear between the bearings 425, and helps to extend the service life of the entire limit wheel set 42. In addition, the spacer sleeve 426 can also enhance the stability of the limit wheel 422, enabling it to maintain a smooth rotating state even during high-speed operation. This improvement reduces the maintenance frequency and enhances the reliability and overall working efficiency of the device.

[0036] Furthermore, the limit wheel set 42 further includes a compression sleeve 427, and the compression sleeve 427 is sleeved on the axle 424 and disposed between the fixed seat 423 and the bearing 425. The function of the compression sleeve 427 is to fix the bearing 425 in place and prevent the bearing 425 from axially displacing on the axle 424; through the pre-compression effect of the compression sleeve 427, the bearing 425 can be firmly positioned at the designed position, thus ensuring the normal operation of the limit wheel set 42. While transmitting the pressure of the fixed seat 423 on the bearing 425, the compression sleeve 427 also plays a buffering role, reducing the impact of vibration on the bearing 425 and enhancing the stability and service life of the entire limit wheel set 42. The application of the compression sleeve 427 can effectively fix the position of the bearing 425, preventing the bearing 425 from displacing due to uneven force or vibration during operation, thereby maintaining the structural stability of the limit wheel set 42. The design of the compression sleeve 427 can also reduce the wear caused by uneven pressure on the bearing 425 and extend the service life of the bearing 425.

[0037] Furthermore, the locking mechanism 4 further includes a first elastic member 43. The first elastic member 43 is sleeved on one end of the bolt 41 away from the limiting plate 421. One end of the first elastic member 43 abuts against the limiting plate 421, and a fastening member 44 is provided at the other end. The fastening member 44 and the limiting plate 421 pre-compress the first elastic member 43. By designing the first elastic member 43 in the present utility model, the decline of the pre-tightening force of the expansion joint 1 can be effectively compensated. When the pre-tightening force of the expansion joint 1 declines, it can be automatically compensated by the elastic deformation of the first elastic member 43. Moreover, the pre-compressed first elastic member 43 can continuously apply a pressing force to the limiting plate 421, further enabling the limiting wheel 422 to press the moving ring 3, thereby maintaining the fastening state of the entire device and ensuring close contact between the moving ring 3 and the static ring 2. The pre-compression function of the first elastic member 43 ensures that during long-term use, the fastening state of the device will not become loose due to mechanical vibration or temperature change, and thus maintain high-efficiency sealing performance. In addition, the first elastic member 43 can also absorb part of the stress caused by thermal expansion and contraction, reduce the stress concentration of the sealing device, and extend the service life.

[0038] In some embodiments, a washer is provided between the fastening member 44 and the first elastic member 43. By providing the washer, the pressure applied by the fastening member 44 on the first elastic member 43 can be effectively evenly distributed, preventing the stress concentration phenomenon caused by the direct contact between the fastening member 44 and the first elastic member 43, thereby avoiding premature damage or failure of the first elastic member 43. By adding a washer between the fastening member 44 and the first elastic member 43, the service life of the first elastic member 43 and the overall stability of the sealing device are effectively improved. The presence of the washer ensures that the pressure of the fastening member 44 can be evenly transmitted to the first elastic member 43, preventing stress concentration caused by point contact, and reducing the deformation and wear of the first elastic member 43.

[0039] Furthermore, a fastening member 44 fixedly connected to the bolt 41 is provided in abutment with one end of the static ring 2 away from the expansion joint 1, and a fastening member 44 fixedly connected to the bolt 41 is provided in abutment with one end of the limiting plate 421 away from the first elastic member 43. In the present utility model, by fixing one end of the static ring 2 away from the expansion joint 1 through the fastening member 44, it can be ensured that the static ring 2 and the expansion joint 1 are fixedly connected; by fixing the distal end of the limiting plate 421 through the fastening member 44, the position of the limiting plate 421 is further ensured to be stable. Such a design helps to maintain the structural stability of the entire sealing device, ensure the precise alignment between components, and thus maintain the high-efficiency sealing performance of the system. Through the fixed connection of the static ring 2 and the limiting plate 421 with the bolt 41, loosening or displacement caused by vibration or thermal expansion during the operation of the device is effectively avoided. The use of the fastening member 44 ensures the stable positioning of each component, thereby improving the reliability and service life of the entire sealing device.

[0040] Furthermore, the static and dynamic sealing device of the cracking kettle further includes a plurality of tensioning mechanisms 5, which are distributed circumferentially along the expansion joint 1. The tensioning mechanism 5 includes a screw 52 and a second elastic member 51. The screw 52 passes through the flanges at both ends of the expansion joint 1, and the second elastic member 51 is sleeved on the screw 52 and is arranged between the flanges at both ends of the expansion joint 1. The design of the tensioning mechanism 5 is used to apply tension to the expansion joint 1 to compensate for the dimensional changes caused by thermal expansion or mechanical stress during the operation of the cracking kettle. The screw 52 passes through the flanges at both ends of the expansion joint 1, ensuring that the tensioning mechanism 5 can evenly distribute the tension to each part of the expansion joint 1. The second elastic member 51 is sleeved on the screw 52 and is located between the flanges at both ends of the expansion joint 1, playing a buffering and adjusting role. The second elastic member 51 can automatically adjust according to the expansion and contraction of the expansion joint 1, maintaining the overall stability and sealing performance of the device. Through the elastic tension provided by the tensioning mechanism 5, the displacement change of the expansion joint 1 under high temperature or high pressure conditions is compensated, avoiding seal failure caused by thermal expansion or mechanical stress. The buffering effect of the second elastic member 51 can effectively reduce the structural deformation caused by external forces and extend the service life of the device.

[0041] The working process of the above-mentioned static and dynamic sealing device of the cracking kettle is as follows:

[0042] The static and dynamic sealing device of the cracking kettle realizes the sealing function through the coaxial abutment of the static ring 2 and the dynamic ring 3. The expansion joint 1 is used to absorb the displacement and vibration during operation and maintain the sealing performance of the device. The limiting wheel 422 presses the dynamic ring 3 to ensure that the dynamic ring 3 and the static ring 2 are always in close contact, thus maintaining the seal at the static-dynamic junction. When a gap is generated due to rolling friction wear between the dynamic ring 3 and the limiting wheel 422, the limiting wheel 422 can be re-pressed against the dynamic ring 3 by adjusting the fastener 44 to ensure that the dynamic ring 3 and the static ring 2 are in close contact again, reducing friction and extending the service life of the device. When the pre-tightening force of the expansion joint 1 declines, it can be automatically compensated by the elastic deformation of the first elastic member 43. By continuously applying a reverse pressure, it is ensured that the dynamic ring 3 and the static ring 2 are in close contact. The tensioning mechanism 5 applies tension to the expansion joint 1 through the screw 52 and the second elastic member 51, and automatically adjusts to adapt to thermal expansion and contraction and pressure fluctuations, ensuring the stable operation of the device under various working conditions.

[0043] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0044] The above-described embodiments merely represent several implementation manners of the present utility model. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all fall within the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be subject to the appended claims.

Claims

1. A dynamic and static sealing device for a cracking kettle, characterized in that: include: Expansion joints; A stationary ring, coaxially fixed to one side of the expansion joint; A dynamic ring coaxially abuts against a side of the static ring away from the expansion joint; A plurality of locking mechanisms are evenly distributed along the circumference of the moving ring, one end of the locking mechanism is connected to the stationary ring and / or the expansion joint, and the other end is against the side of the moving ring away from the stationary ring and in rolling contact with the moving ring.

2. The dynamic and static sealing device of the cracking kettle according to claim 1, characterized in that: The locking mechanism comprises: A plurality of bolts, wherein the bolts pass through the expansion joint and the stationary ring to fix the expansion joint and the stationary ring together; The limiting wheel group is passed through one end of the plurality of bolts away from the expansion joint. The limiting wheel group comprises a limiting wheel and a limiting plate. The limiting wheel is arranged on the limiting plate, and the limiting wheel abuts against the moving ring.

3. The dynamic and static sealing device of the cracking kettle according to claim 2 is characterized in that: The limiting plate is passed through the plurality of bolts, a slot is formed on the limiting plate, the limiting wheel is disposed in the slot, and rotates in the slot at least during operation.

4. The dynamic and static sealing device of the cracking kettle according to claim 3, characterized in that: The limiting wheel set also includes: Two fixing seats are respectively arranged on the upper and lower sides of the notch; The two ends of the wheel axle are respectively inserted into the two fixing seats, the limiting wheel sleeve is arranged on the wheel axle, and the limiting wheel rotates around the wheel axle in the slot.

5. The dynamic and static sealing device of the cracking kettle according to claim 4, characterized in that: The limiting wheel set also includes a plurality of bearings, which are arranged at intervals along the axial direction of the wheel axle, and the bearing sleeve is arranged between the wheel axle and the limiting wheel.

6. The dynamic and static sealing device of the cracking kettle according to claim 5, characterized in that: The position-limiting wheel set also includes a spacer sleeve, which is sleeved on the wheel axle and arranged between two adjacent bearings.

7. The dynamic and static sealing device of the cracking kettle according to claim 5, characterized in that: The position-limiting wheel assembly further comprises a pressing sleeve, which is sleeved on the wheel axle and arranged between the fixing seat and the bearing.

8. The dynamic and static sealing device of the cracking kettle according to claim 2, characterized in that: The locking mechanism also includes a first elastic member, which is sleeved on one end of the bolt away from the limiting plate, one end of the first elastic member abuts against the limiting plate, and the other end of the first elastic member is provided with a fastener, and the fastener and the limiting plate pre-tighten the first elastic member.

9. The dynamic and static sealing device of the cracking kettle according to claim 8, characterized in that: The end of the static ring away from the expansion joint is abutted against the fastener fixedly connected to the bolt, and the end of the limit plate away from the first elastic member is abutted against the fastener fixedly connected to the bolt.

10. The dynamic and static sealing device of the cracking kettle according to claim 1, characterized in that: It also includes a plurality of tensioning mechanisms distributed along the circumference of the expansion joint, and the tensioning mechanisms include: A screw rod, wherein the screw rod is passed through flanges at both ends of the expansion joint; The second elastic member is sleeved on the screw rod and arranged between the flanges at both ends of the expansion joint.

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