Auxiliary device for automatically removing coke slag in hearth of circulating fluidized bed boiler

Abstract

The utility model relates to the technical field of circulating fluidized bed boilers, in particular to an auxiliary device for automatically removing coke slag in a hearth of a circulating fluidized bed boiler, which comprises a supporting part, two groups of crawling parts and a cleaning part, one group of crawling parts are movably arranged between the top plate and the upper fixing plate, the other group of crawling parts are arranged on the upper surface of the upper fixing plate, each crawling part comprises a crawling ring and a jacking air cylinder, the jacking air cylinders are arranged on the side walls of the crawling rings in the circumferential direction, and the ends of piston rods of the jacking air cylinders abut against or are separated from the inner wall of the hearth; a cleaning motor is arranged between the upper fixing plate and the lower fixing plate, the cleaning part comprises a mounting shell, and the upper end of the mounting shell is detachably connected with an output shaft of the cleaning motor. In the utility model, the supporting part and the crawling part are matched to realize automatic walking, so that the whole device can move along the inner wall of a hearth, and the cleaning part is matched to realize automatic decoking, thereby reducing the influence of smoke dust and fly ash on workers.

Description

Technical Field

[0001] The utility model relates to the technical field of circulating fluidized bed boilers, in particular to an auxiliary device for automatically removing coke slag in a furnace of a circulating fluidized bed boiler. Background Art

[0002] With the gradual depletion and deterioration of coal resources, many small and medium-sized power stations that burn coal now use circulating fluidized bed boilers. Circulating fluidized bed boilers use circulating fluidized bed combustion technology and have the advantages of high efficiency, cleanliness, low pollution, wide fuel use, and high ash utilization rate. Therefore, circulating fluidized bed boilers are widely used in power station boilers and waste incineration fields. Coking in the boiler furnace has become a common phenomenon in the operation of circulating fluidized bed boilers. Generally, in the case of coking in the furnace, it is necessary to open the furnace entry door and use tools to remove the coke, or enter the furnace for manual decoking after the boiler is fully cooled. Both methods require manual operation, consume manpower, and have low decoking efficiency. In addition, the fly ash and smoke generated during the decoking process are not good for the health of workers. Utility Model Content

[0003] The main purpose of the utility model is to provide an automatic coke slag removal auxiliary device in the furnace of a circulating fluidized bed boiler, which can effectively solve the above-mentioned problem.

[0004] The utility model provides the following technical solution: an automatic coke slag removal auxiliary device in a furnace of a circulating fluidized bed boiler, comprising a supporting part, a crawling part and a cleaning part, wherein the crawling part is provided with two groups, wherein the supporting part is provided with a top plate, an upper fixed plate and a lower fixed plate in sequence from top to bottom, wherein one group of crawling parts is movably arranged between the top plate and the upper fixed plate, and the other group of crawling parts is arranged on the upper surface of the upper fixed plate, wherein the crawling part comprises a crawling ring and a tightening cylinder, wherein the tightening cylinder is arranged on the side wall of the crawling ring at intervals along the circumferential direction, wherein the piston rod end of the tightening cylinder is in contact with or separated from the inner wall of the furnace, wherein a cleaning motor is arranged between the upper fixed plate and the lower fixed plate, wherein the cleaning part is arranged at the lower part of the lower fixed plate, and wherein the cleaning part comprises a mounting shell, wherein the upper end of the mounting shell is detachably connected to the output shaft of the cleaning motor.

[0005] Furthermore, a plurality of fixing rods are fixedly arranged between the top plate and the upper fixing plate, a fixing block is fixedly arranged in the middle of the upper surface of the upper fixing plate, and the plurality of fixing rods are distributed outside the fixing block.

[0006] Furthermore, a crawling cylinder is provided on the upper surface of the fixed block, the piston rod end of the crawling cylinder is fixedly connected to the crawling ring in the upper group of crawling parts, the fixed block is fixedly connected to the crawling ring of the lower group of crawling parts, the upper crawling ring is slidably connected to the fixed rod, and the lower crawling ring is fixedly connected to the fixed rod.

[0007] Furthermore, a plurality of inclined rods are fixedly arranged at intervals along the circumferential direction on the side wall of the creeping ring, the plurality of inclined rods are staggered with the plurality of tightening cylinders, a support arm is rotatably arranged at the end of the inclined rod, the inclined rod and the support arm are both inclined, and a spring is arranged between two opposite surfaces of the inclined rod and the support arm.

[0008] Furthermore, a roller is rotatably provided at the end of the support arm, and the roller abuts against and is rollingly connected to the inner wall of the furnace.

[0009] Furthermore, the interior of the mounting shell is hollow, and a partition plate is fixedly provided in the middle of the inner side of the mounting shell, and the partition plate divides the interior of the mounting shell into an upper mounting cavity and a lower accommodating cavity. A connecting shaft is rotatably provided in the middle of the mounting cavity, and the lower end of the connecting shaft passes through the partition plate and is rotatably connected to the partition plate.

[0010] Furthermore, a worm gear is provided on the upper fixed sleeve of the connecting shaft, and two support plates are spaced apart on one side of the installation cavity, a pitch-adjusting motor is provided on the outer side of one of the support plates, a worm is rotatably arranged between the two support plates, the worm is meshingly connected with the worm gear, and the output shaft end of the pitch-adjusting motor is fixedly connected to the worm gear.

[0011] Furthermore, a turntable is rotatably provided on the upper part of the accommodating chamber, and the turntable is fixedly connected to the lower end of the connecting shaft. A plurality of guide grooves are provided at intervals along the circumferential direction on the outer side of the accommodating chamber, and the guide grooves penetrate the side walls of the mounting shell. Cleaning rods are slidably provided in the guide grooves, and the cleaning rods are movably connected to the turntable via a bending rod. A scraper is detachably connected to the end of the cleaning rod, and the scraper abuts against or separates from the inner wall of the furnace.

[0012] Furthermore, a connecting block is fixedly provided on the upper end of the mounting shell, the output shaft of the cleaning motor passes through the lower fixed plate and is rotatably connected thereto, a connecting sleeve is fixedly provided on the end of the output shaft of the cleaning motor, and the connecting block is plugged into the connecting sleeve and is fastened by bolts.

[0013] Furthermore, a moving block is fixedly provided at the end of the piston rod of the tightening cylinder, and a tightening block is fixedly provided at the end of the moving block away from the creeping ring. The surface of one end of the tightening block close to the inner wall of the furnace is arc-shaped, and the tightening block abuts or separates from the inner wall of the furnace.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] 1. In the utility model, automatic walking is achieved through the support part and the crawling part, so that the whole device can move up and down along the inner wall of the furnace, and the cleaning part is matched to realize automatic decoking, without manual decoking, saving manpower, reducing the impact of smoke and fly ash on workers, and increasing the safety of the entire cleaning work.

[0016] 2. In the utility model, a support arm is rotatably connected to the inclined rod, and a spring is arranged between the support arm and the inclined rod. The support arm rotates to compress and contract the spring. In combination with a tightening cylinder and a distance-adjusting motor, the tightening cylinder can fix the crawling ring relatively to the inner wall of the furnace, and the distance-adjusting motor adjusts the length of the cleaning rod, so that the entire device can adapt to furnaces of different sizes, has a wider range of use, and is more convenient.

[0017] 3. In the utility model, the tightening cylinder, the cleaning motor, the pitch-adjusting motor and the crawling cylinder are all resistant to high temperatures, and there is no need to wait for the furnace to be fully cooled before decoking. Combined with automatic cleaning, the decoking efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The utility model is further described below in conjunction with the accompanying drawings.

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the utility model from another perspective;

[0021] Figure 3 This is a schematic diagram of the support structure of the utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the crawling part of the utility model;

[0023] Figure 5 This is a schematic diagram of the structure of the cleaning part of the utility model;

[0024] Figure 6 This is a schematic diagram of a half-section structure of the installation shell of the utility model;

[0025] Figure 7 This is a schematic diagram of the half-section structure of the bottom of the installation shell of the utility model;

[0026] Figure 8 It is a schematic diagram of the half-section structure of the middle part of the installation shell of the utility model.

[0027] 1. Support part; 11. Top plate; 12. Upper fixed plate; 13. Lower fixed plate; 14. Cleaning motor; 141. Connecting sleeve; 15. Fixed block; 16. Climbing cylinder; 17. Fixed rod; 2. Climbing part; 21. Climbing ring; 211. Mounting groove; 212. Slide hole; 22. Tightening cylinder; 221. Moving block; 222. Tightening block; 23. Oblique rod; 24. Spring; 25. Support arm; 26. Roller; 3. Cleaning part; 31. Mounting shell; 311. Partition plate; 312. Guide plate; 313. Guide groove; 32. Pitch-adjusting motor; 321. Worm; 33. Support plate; 34. Worm wheel; 35. Connecting shaft; 36. Cleaning rod; 361. Scraper; 362. Boss; 37. Turntable; 371. Connecting column; 38. Bending rod; 39. Connecting block. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] Specific implementation examples Figure 1-8 As shown: an automatic coke slag removal auxiliary device in the furnace of a circulating fluidized bed boiler, comprising a supporting part 1, a crawling part 2 and a cleaning part 3. The crawling part 2 is provided with two groups. The supporting part 1 is provided with a top plate 11, an upper fixed plate 12 and a lower fixed plate 13 in sequence from top to bottom. One group of crawling parts 2 is movably arranged between the top plate 11 and the upper fixed plate 12, and the other group of crawling parts 2 is arranged on the upper surface of the upper fixed plate 12. The crawling part 2 comprises a crawling ring 21 and a tightening cylinder 22. A plurality of mounting grooves 211 are arranged on the side wall of the crawling ring 21 in a circumferential direction. The tightening cylinder 22 is arranged in the mounting groove 211. The piston rod end of the tightening cylinder 22 is in contact with or separated from the inner wall of the furnace. A cleaning motor 14 is arranged between the upper fixed plate 12 and the lower fixed plate 13. The cleaning part 3 is arranged at the lower part of the lower fixed plate 13. The cleaning part 3 comprises a mounting shell 31. The upper end of the mounting shell 31 is detachably connected to the output shaft of the cleaning motor 14.

[0030] Furthermore, a plurality of fixing rods 17 are fixedly disposed between the top plate 11 and the upper fixing plate 12 , a fixing block 15 is fixedly disposed in the middle of the upper surface of the upper fixing plate 12 , and the plurality of fixing rods 17 are distributed outside the fixing block 15 .

[0031] Furthermore, a creeping cylinder 16 is provided on the upper surface of the fixed block 15, and the piston rod end of the creeping cylinder 16 is fixedly connected to the creeping ring 21 in the upper group of creeping parts 2, and the fixed block 15 is fixedly connected to the creeping ring 21 of the lower group of creeping parts 2, and a plurality of sliding holes 212 are spaced apart on the upper surface of the creeping ring 21, and the sliding holes 212 of the upper creeping ring 21 are slidingly connected to the fixed rod 17, and the sliding holes 212 of the lower creeping ring 21 are fixedly connected to the fixed rod 17.

[0032] Furthermore, a plurality of inclined rods 23 are fixedly arranged at intervals along the circumferential direction on the side wall of the creeping ring 21, and the plurality of inclined rods 23 are staggered with the plurality of tightening cylinders 22. A support arm 25 is rotatably arranged at the end of the inclined rod 23. The inclined rod 23 is arranged to be inclined downward, and the support arm 25 is arranged to be inclined upward. A spring 24 is arranged between the two opposite surfaces of the inclined rod 23 and the support arm 25.

[0033] Furthermore, a roller 26 is rotatably provided at the end of the support arm 25, and the roller 26 abuts against and is rollingly connected to the inner wall of the furnace. The rotatably provided support arm 25 can adapt to boilers of different diameters under the action of the spring 24, and can also prevent other components in the device from colliding with the inner wall of the furnace during movement.

[0034] Furthermore, the interior of the mounting shell 31 is hollow, and a partition plate 311 is fixedly provided in the middle of the inner side of the mounting shell 31. The partition plate 311 divides the interior of the mounting shell 31 into an upper mounting cavity and a lower accommodating cavity. A connecting shaft 35 is rotatably provided in the middle of the mounting cavity, and the lower end of the connecting shaft 35 passes through the partition plate 311 and is rotatably connected to the partition plate 311.

[0035] Furthermore, a worm gear 34 is provided on the upper fixed sleeve of the connecting shaft 35, and two support plates 33 are arranged at intervals on one side of the installation cavity, and a pitch-adjusting motor 32 is arranged on the outer side of one of the support plates 33, and a worm 321 is rotatably arranged between the two support plates 33, and the worm 321 is meshingly connected with the worm gear 34 for transmission, and the output shaft end of the pitch-adjusting motor 32 is fixedly connected with the worm 321, and the provided support arm 25 is rotatably connected with the inclined rod 23, and a spring 24 is provided between the support arm 25 and the inclined rod 23, and the support arm 25 rotates to compress and contract the spring 24, and is matched with the tightening cylinder 22 and the pitch-adjusting motor 32, the tightening cylinder 22 can fix the creeping ring 21 relatively to the inner wall of the furnace, and the pitch-adjusting motor 32 adjusts the length of the cleaning rod 36, so that the entire device can adapt to furnaces of different sizes, with a wider range of use and more convenience.

[0036] Furthermore, a turntable 37 is rotatably provided on the upper part of the accommodating chamber, and the turntable 37 is fixedly connected to the lower end of the connecting shaft 35. A plurality of guide grooves 313 are spaced apart along the circumferential direction on the outer side of the accommodating chamber, and the guide grooves 313 penetrate the side walls of the mounting shell 31. Cleaning rods 36 are slidably provided in the guide grooves 313. A plurality of groups of guide plates 312 are fixedly provided at intervals along the circumferential direction on the bottom of the accommodating chamber, and a group of guide plates 312 corresponds to a guide groove 313. Each group of guide plates 312 includes two guide plates 312 symmetrically arranged on both sides of the guide groove 313. The cleaning rod 36 is slidably arranged between the corresponding two guide plates 312. The guide plates 312 can guide the cleaning rod 36, and at the same time, they also have a certain stabilizing effect on the cleaning rod 36 to prevent the cleaning rod 36 from being damaged. The cleaning rod 36 shakes when scraping off the coke slag. The end of the cleaning rod 36 is detachably connected to a scraper 361, and the scraper 361 abuts against or separates from the inner wall of the furnace. A protrusion 362 is fixedly provided at one end of the cleaning rod 36 close to the turntable 37. A plurality of connecting columns 371 are fixedly provided at intervals along the circumferential direction on the lower surface of the turntable 37, and one connecting column 371 corresponds to one protrusion 362. A plurality of bent rods 38 are movably provided between the turntable 37 and the cleaning rod 36. One end of the bent rod 38 is rotatably connected to the connecting column 371, and the other end is rotatably connected to the corresponding protrusion 362. As the turntable 37 rotates, the cleaning rod 36 can be extended or retracted along the guide groove 313 under the action of the bent rod 38. The bent rod 38 is located between the turntable 37 and the guide plate 312.

[0037] Furthermore, a connecting block 39 is fixedly provided on the upper end of the mounting shell 31, and the output shaft of the cleaning motor 14 passes through the lower fixed plate 13 and is rotatably connected thereto. A connecting sleeve 141 is fixedly provided on the end of the output shaft of the cleaning motor 14, and the connecting block 39 is plugged into the connecting sleeve 141 and is fastened by bolts.

[0038] Furthermore, a moving block 221 is fixedly provided at the end of the piston rod of the tightening cylinder 22, and a tightening block 222 is fixedly provided at one end of the moving block 221 away from the creeping ring 21. The surface of one end of the tightening block 222 close to the inner wall of the furnace is arc-shaped, and the tightening block 222 abuts against or separates from the inner wall of the furnace. The tightening block 222 is made of high-temperature resistant elastic material, such as silicone rubber, fluororubber, high-temperature silicone, etc. The tightening block 222 with an arc surface can adapt to boilers of different sizes, and the use of elastic material will not cause damage to the inner wall of the furnace when the tightening block 222 is tightened against the inner wall of the furnace. At the same time, the tightening cylinder 22, the cleaning motor 14, the pitch adjusting motor 32 and the creeping cylinder 16 are all resistant to high temperatures, and there is no need to wait for the furnace to be fully cooled before performing the decoking operation. The furnace can be cooled to more than 100 degrees before the device can be used for decoking, thereby improving the decoking efficiency.

[0039] When an automatic slag removal auxiliary device in a circulating fluidized bed boiler furnace is in use, the entire device is placed inside the boiler furnace, the roller 26 at the end of the support arm 25 abuts against the inner wall of the furnace, the spring 24 contracts, and the tightening cylinder 22 of a group of crawling parts 2 below is started. The piston rod of the tightening cylinder 22 extends to drive the tightening block 222 to move. When the tightening block 222 is tightened and fixed to the inner wall of the furnace, the pitch-adjusting motor 32 is started, and the output shaft of the pitch-adjusting motor 32 rotates, driving the worm 321 to rotate, and the worm wheel 34 meshing with the worm 321 rotates, driving the connecting shaft 35 to rotate, and the connecting shaft 35 drives the turntable 37 to rotate, and the bent rod 38 movably connected to the turntable 37 moves, pushing the cleaning rod 36 to move to the outside of the mounting shell 31. When the scraper 361 contacts the inner wall of the furnace, the pitch-adjusting motor 32 is turned off, and the cleaning motor 14 is started. The output shaft rotates, driving the connecting sleeve 141 to rotate, and the entire mounting shell 31 rotates accordingly. Under the action of the cleaning motor 14, the scraper 361 scrapes and cleans the slag on the inner wall of the furnace. When the slag at the corresponding height on the inner wall of the furnace is scraped off and the slag below needs to be cleaned further, the crawling cylinder 16 is started, and the piston rod of the crawling cylinder 16 retracts, driving the crawling ring 21 of the upper group of crawling parts 2 to move downward, and then the tightening cylinder 22 of the upper group of crawling parts 2 is started, so that the crawling ring 21 of the upper group of crawling parts 2 is relatively fixed to the inner wall of the furnace, and the piston rod of the tightening cylinder 22 of the lower group of crawling parts 2 is retracted, so that the piston rod of the crawling cylinder 16 is extended, driving the lower group of crawling parts 2 and the cleaning part 3 to move downward together, and the cleaning motor 14 is started again to perform the scraping work, and so on until the cleaning work in the entire boiler furnace is completed. When the device is in use, the supporting part 1 and the crawling part 2 realize automatic walking, so that the whole device can move up and down along the inner wall of the furnace, and cooperate with the cleaning part 3 to realize automatic decoking, without the need for manual decoking, saving manpower, reducing the impact of smoke and fly ash on workers, and increasing the safety of the entire cleaning work.

Claims

1. An auxiliary device for automatically removing coke slag in a circulating fluidized bed boiler furnace, characterized in that: The invention comprises a supporting part (1), a crawling part (2) and a cleaning part (3), wherein the crawling part (2) is provided with two groups, wherein the supporting part (1) is provided with a top plate (11), an upper fixing plate (12) and a lower fixing plate (13) in sequence from top to bottom, wherein one group of crawling parts (2) is movably arranged between the top plate (11) and the upper fixing plate (12), and the other group of crawling parts (2) is arranged on the upper surface of the upper fixing plate (12), and the crawling part (2) comprises a crawling ring (21) and a tightening cylinder (22). ), the tightening cylinder (22) is arranged on the side wall of the creeping ring (21) at intervals along the circumferential direction, the piston rod end of the tightening cylinder (22) is in contact with or separated from the inner wall of the furnace, a cleaning motor (14) is arranged between the upper fixed plate (12) and the lower fixed plate (13), the cleaning part (3) is arranged at the lower part of the lower fixed plate (13), and the cleaning part (3) includes a mounting shell (31), and the upper end of the mounting shell (31) is detachably connected to the output shaft of the cleaning motor (14).

2. The automatic coke slag removal auxiliary device in the furnace of a circulating fluidized bed boiler according to claim 1, characterized in that: A plurality of fixing rods (17) are fixedly arranged between the top plate (11) and the upper fixing plate (12); a fixing block (15) is fixedly arranged in the middle of the upper surface of the upper fixing plate (12); and the plurality of fixing rods (17) are distributed outside the fixing block (15).

3. The automatic coke slag removal auxiliary device in the furnace of a circulating fluidized bed boiler according to claim 2, characterized in that: A creeping cylinder (16) is arranged on the upper surface of the fixed block (15); the piston rod end of the creeping cylinder (16) is fixedly connected to a creeping ring (21) in a creeping part (2) located in an upper group; the fixed block (15) is fixedly connected to a creeping ring (21) in a creeping part (2) located in a lower group; the creeping ring (21) located in an upper group is slidably connected to a fixed rod (17); and the creeping ring (21) located in a lower group is fixedly connected to the fixed rod (17).

4. The automatic coke slag removal auxiliary device in the furnace of a circulating fluidized bed boiler according to claim 1, characterized in that: A plurality of inclined rods (23) are fixedly arranged at intervals along the circumferential direction on the side wall of the climbing ring (21); the plurality of inclined rods (23) and the plurality of tightening cylinders (22) are arranged in a staggered manner; a support arm (25) is rotatably arranged at the end of the inclined rod (23); the inclined rod (23) and the support arm (25) are both arranged in an inclined manner; and a spring (24) is arranged between two surfaces opposite to each other of the inclined rod (23) and the support arm (25).

5. The automatic coke slag removal auxiliary device in the furnace of a circulating fluidized bed boiler according to claim 4, characterized in that: A roller (26) is rotatably provided at the end of the support arm (25), and the roller (26) abuts against and is rollingly connected to the inner wall of the furnace.

6. The automatic coke slag removal auxiliary device in the furnace of a circulating fluidized bed boiler according to claim 1, characterized in that: The interior of the installation shell (31) is hollow, and a partition plate (311) is fixedly arranged in the middle of the inner side of the installation shell (31), and the partition plate (311) divides the interior of the installation shell (31) into an upper installation cavity and a lower accommodating cavity. A connecting shaft (35) is rotatably arranged in the middle of the installation cavity, and the lower end of the connecting shaft (35) passes through the partition plate (311) and is rotatably connected to the partition plate (311).

7. The automatic coke slag removal auxiliary device in the furnace of a circulating fluidized bed boiler according to claim 6, characterized in that: A worm gear (34) is fixedly sleeved on the upper part of the connecting shaft (35); two support plates (33) are spaced apart at one side of the installation cavity; a pitch-adjustable motor (32) is arranged on the outer side of one of the support plates (33); a worm (321) is rotatably arranged between the two support plates (33); the worm (321) is meshingly connected to the worm gear (34); and an output shaft end of the pitch-adjustable motor (32) is fixedly connected to the worm gear (321).

8. The automatic coke slag removal auxiliary device in the furnace of a circulating fluidized bed boiler according to claim 7, characterized in that: A rotating disk (37) is rotatably arranged at the upper part of the accommodating chamber, and the rotating disk (37) is fixedly connected to the lower end of the connecting shaft (35). A plurality of guide grooves (313) are arranged at intervals along the circumferential direction on the outer side of the accommodating chamber, and the guide grooves (313) penetrate the side walls of the mounting shell (31). Cleaning rods (36) are slidably arranged in the guide grooves (313). The cleaning rods (36) are movably connected to the rotating disk (37) via a bent rod (38), and a scraper (361) is detachably connected to the end of the cleaning rod (36), and the scraper (361) abuts against or separates from the inner wall of the furnace.

9. The automatic coke slag removal auxiliary device in the furnace of a circulating fluidized bed boiler according to claim 1, characterized in that: A connecting block (39) is fixedly provided at the upper end of the mounting shell (31); the output shaft of the cleaning motor (14) passes through the lower fixing plate (13) and is rotatably connected thereto; a connecting sleeve (141) is fixedly provided at the end of the output shaft of the cleaning motor (14); the connecting block (39) and the connecting sleeve (141) are plugged in and fastened together by bolts.

10. The automatic coke slag removal auxiliary device in the furnace of a circulating fluidized bed boiler according to claim 1, characterized in that: A moving block (221) is fixedly provided at the end of the piston rod of the tightening cylinder (22); a tightening block (222) is fixedly provided at one end of the moving block (221) away from the creeping ring (21); an end surface of the tightening block (222) close to the inner wall of the furnace is arc-shaped; the tightening block (222) is in contact with or separated from the inner wall of the furnace.

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