A calcining furnace preheating smoke exhaust structure

Abstract

The present invention belongs to the technical field of calcining furnace equipment, and discloses a calcining furnace preheating smoke exhaust structure, and its technical points are: it comprises a calcining furnace body and a boiler body, a top layer fire channel is arranged on the top of the calcining furnace body, a smoke exhaust pipe is fixedly installed between the calcining furnace body and the boiler body, a first cleaning mechanism is arranged in the inner cavity of the smoke exhaust pipe, the first cleaning mechanism comprises a cleaning component and a dust collecting component, the cleaning component comprises a scraper, a first positioning part and a pulling part, second cleaning mechanisms are respectively arranged on both sides of the scraper, the second cleaning mechanism comprises a scraper strip, a second positioning part and a driving part, which solves the problem that the staff are currently required to regularly disassemble and clean the pipeline and the filter mesh, and the pipeline use effect is poor.

Description

Technical Field

[0001] The invention relates to the technical field of calcining furnace equipment, in particular to a calcining furnace preheating smoke exhaust structure. Background Art

[0002] The bottom of the existing calcining furnace is provided with a cooling air channel connected to the flue, which can not only cool the furnace bottom, but also guide the preheated air to the top fire channel to achieve full combustion in the top fire channel, thereby reducing the emission of polluted air.

[0003] The existing structure is generally provided with a preheating pipe, a connecting pipe and a regulating valve. The preheating pipe extends along the bottom wall and side wall of the calcining furnace body to the top fire channel of the furnace body. One end of the connecting pipe passes through the calcining furnace body and is connected to the preheating pipe, and the other end is connected to the flue gas inlet.

[0004] When the excess flue gas in the calcining furnace circulates in the pipe, the particulate impurities in the flue gas are easy to adhere to the inner wall of the pipe. When the filter mesh is installed in the pipe to filter the flue gas, the particulate impurities are also easy to adhere to the surface of the filter mesh and cause blockage. Therefore, the staff needs to dismantle and clean the pipe and filter mesh regularly, resulting in poor use of the pipe. Summary of the invention

[0005] The object of the present invention is to provide a calcining furnace preheating smoke exhaust structure to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A calcining furnace preheating smoke exhaust structure comprises a calcining furnace body and a boiler body, a top layer fire channel is arranged on the top of the calcining furnace body, a smoke exhaust pipe is fixedly installed between the calcining furnace body and the boiler body, the smoke exhaust pipe is a V-shaped structure, one end of the smoke exhaust pipe is connected with the boiler body, and the other end of the smoke exhaust pipe is connected with the top layer fire channel, a first dust cleaning mechanism is arranged in the inner cavity of the smoke exhaust pipe, the first dust cleaning mechanism comprises a cleaning component and a dust collecting component, the cleaning component comprises a scraper, a first positioning part and a pulling part, the scraper is arranged in two groups and is symmetrically located in the smoke exhaust pipe, a filter mesh is arranged on the surface of the scraper, the first positioning part is located in the smoke exhaust pipe and is connected to the scraper, and the pulling part is located in the exhaust pipe The bottom of the smoke pipe is connected to the scraper, the pulling part controls the scraper to move back and forth in the smoke exhaust pipe by cooperating with the first positioning part, the dust collecting component is located at the bottom of the smoke exhaust pipe, the dust collecting component is used to collect particulate impurities in the smoke exhaust pipe, and the scraper is provided with a second cleaning mechanism on both sides, the second cleaning mechanism includes a scraper strip, a second positioning part and a driving part, the scraper strip is provided with two groups and is respectively located on both sides of the scraper, the second positioning part is located on the scraper surface and connected to the scraper strip, the driving part is located on the bottom wall of the scraper and connected to the second positioning part, when the scraper moves back and forth in the smoke exhaust pipe, the driving part controls the scraper strip to move synchronously back and forth on the scraper surface by cooperating with the second positioning part.

[0008] As a further solution of the present invention: the first positioning part includes two groups of relatively distributed positioning plates fixedly installed on both sides of the inner cavity of the smoke exhaust pipe, two groups of guide rods fixedly installed between the two relatively distributed positioning plates, the guide rods are slidably connected to the scraper, and a first extrusion spring is fixedly installed on the surface of the positioning plate below, the first extrusion spring surrounds the surface of the guide rod and is connected to the scraper.

[0009] As a further solution of the present invention: the pulling part includes a winding roller fixedly installed at the bottom of the smoke exhaust pipe, one end of the winding roller extends to the outside of the smoke exhaust pipe and is connected to a motor, and a first pulling rope is fixedly installed on the surface of the scraper, and the end of the first pulling rope away from the scraper passes downward through the positioning plate and is connected to the winding roller.

[0010] As a further solution of the present invention: the second positioning portion includes two groups of relatively distributed vertical grooves opened on the scraper surface, and sliding blocks are slidably installed in the vertical grooves. The two groups of sliding blocks extend to the outside of the vertical grooves and are connected to the two ends of the scraper strip. A second extrusion spring is fixedly installed at the bottom end of the vertical groove, and the telescopic end of the second extrusion spring is connected to the sliding block.

[0011] As a further solution of the present invention: the driving part includes two groups of relatively distributed side plates fixedly installed at the bottom end of the scraper side wall, the two groups of side plates are jointly rotatably installed with a rotating rod, a winding wheel is fixedly installed on the surface of the rotating rod, a second pulling rope is fixedly installed on the side wall of the sliding block, the end of the second pulling rope away from the sliding block is connected to the winding wheel, a fixed toothed disc is fixedly installed on the end of the rotating rod, and a rack meshing with the fixed toothed disc is fixedly provided on the inner bottom wall of the smoke exhaust pipe.

[0012] As a further solution of the present invention: the dust collecting assembly includes a dust collecting cylinder fixedly installed at the bottom of the smoke exhaust pipe, the dust collecting cylinder is connected to the bottom of the smoke exhaust pipe, and an end cover is arranged at the bottom of the dust collecting cylinder.

[0013] As a further solution of the present invention: the bottom wall of the scraper is provided with an opening which cooperates with the rack.

[0014] Compared with the prior art, the beneficial effects of the present invention are: by setting the first positioning part and the pulling part to cooperate with each other, the scraper can be conveniently controlled to move back and forth in the inner cavity of the smoke exhaust pipe, and then the particle impurities attached to the inner wall of the smoke exhaust pipe can be automatically cleaned; by setting the second positioning part and the driving part to cooperate with each other, the scraper can be controlled to move back and forth on the scraper surface, and the scraper can automatically clean the particle impurities attached to the scraper surface. The problem that the staff needs to disassemble and clean the pipe and the filter mesh regularly and the pipe use effect is poor is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the three-dimensional structure of a calcining furnace preheating and smoke exhaust structure provided in an embodiment of the present invention;

[0016] Figure 2 It is a schematic diagram of the main structure of a calcining furnace preheating and smoke exhaust structure provided in an embodiment of the present invention;

[0017] Figure 3 for Figure 2 A is a schematic diagram of the enlarged structure of the middle part;

[0018] Figure 4 It is a structural schematic diagram of a pulling part in a calcining furnace preheating smoke exhaust structure provided in an embodiment of the present invention;

[0019] Figure 5 The present invention is a schematic diagram of a scraper and its connection structure in a calcining furnace preheating smoke exhaust structure provided in an embodiment of the present invention.

[0020] Among them: 1-calcining furnace body, 11-top fire channel, 2-boiler body, 3-exhaust pipe, 4-first cleaning mechanism, 41-cleaning component, 411-scraper, 4111-filter mesh, 412-first positioning part, 4121-positioning plate, 4122-guide rod, 4123-first extrusion spring, 413-pulling part, 4131-winding roller, 4132-motor, 4133-first pulling rope, 42-dust collecting component, 421-dust collecting cylinder, 422-end cover, 5-second cleaning mechanism, 51-scraper, 52-second positioning part, 521-vertical groove, 522-second extrusion spring, 523-sliding block, 53-driving part, 531-side plate, 532-rotating rod, 533-winding wheel, 534-fixed gear disc, 535-rack, 536-second pulling rope, 6-opening. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0022] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0023] like Figure 1 , Figure 2 , Figure 4 , Figure 5As shown, it is a structural diagram of a calcining furnace preheating smoke exhaust structure provided by an embodiment of the present invention, comprising a calcining furnace body 1 and a boiler body 2, wherein a top layer fire channel 11 is arranged on the top of the calcining furnace body 1, and a smoke exhaust pipe 3 is fixedly installed between the calcining furnace body 1 and the boiler body 2, and the smoke exhaust pipe 3 is a V-shaped structure, one end of the smoke exhaust pipe 3 is connected to the boiler body 2, and the other end of the smoke exhaust pipe 3 is connected to the top layer fire channel 11, and a first ash cleaning mechanism 4 is arranged in the inner cavity of the smoke exhaust pipe 3, and the first ash cleaning mechanism 4 includes a cleaning component 41 and a dust collecting component 42, and the cleaning component 41 includes a scraper 411, a first positioning portion 412 and a pulling portion 413, and the scraper 411 is provided with two groups and is symmetrically located in the smoke exhaust pipe 3, and a filter mesh 4111 is arranged on the surface of the scraper 411, and the first positioning portion 412 is located in the smoke exhaust pipe 3 and is connected to the scraper 411, and the pulling portion 4 13 is located at the bottom of the smoke exhaust pipe 3 and is connected to the scraper 411. The pulling part 413 controls the scraper 411 to move back and forth in the smoke exhaust pipe 3 by cooperating with the first positioning part 412. The dust collecting component 42 is located at the bottom of the smoke exhaust pipe 3. The dust collecting component 42 is used to collect particulate impurities in the smoke exhaust pipe 3. The scraper 411 is provided with a second cleaning mechanism 5 on both sides. The second cleaning mechanism 5 includes a scraper strip 51, a second positioning part 52 and a driving part 53. The scraper strip 51 is provided with two groups and is respectively located on both sides of the scraper 411. The second positioning part 52 is located on the surface of the scraper 411 and is connected to the scraper strip 51. The driving part 53 is located on the bottom wall of the scraper 411 and is connected to the second positioning part 52. When the scraper 411 moves back and forth in the smoke exhaust pipe 3, the driving part 53 controls the scraper strip 51 to move synchronously back and forth on the surface of the scraper 411 by cooperating with the second positioning part 52.

[0024] Initially, the first positioning portion 412 controls the scraper 411 to be at the top of the exhaust pipe 3, and the second positioning portion 52 controls the scraper 51 to be at the top of the scraper 411. The smoke in the top fire channel 11 passes through the exhaust pipe 3 and then flows into the boiler body 2. When the smoke flows in the exhaust pipe 3, the smoke will pass through the filter mesh 4111 on the surface of the scraper 411. Some of the particulate impurities in the smoke will adhere to the inner wall of the exhaust pipe 3, and another part of the particulate impurities in the smoke will adhere to the surface of the filter mesh 4111. When the particulate impurities attached to the inner wall of the exhaust pipe 3 and the surface of the scraper 411 reach a certain level, the pulling portion 413 cooperates with the first positioning part 412 to control the scraper 411 to move back and forth in the inner cavity of the smoke exhaust pipe 3. The scraper 411 can perform a full range of scraping treatment on the particulate impurities attached to the inner wall of the smoke exhaust pipe 3. When the scraper 411 moves back and forth in the smoke exhaust pipe 3, the driving part 53 cooperates with the second positioning part 52 to control the scraper 51 to move back and forth synchronously along the surface of the scraper 411. The scraper 51 can perform a full range of scraping treatment on the particulate impurities attached to the surface of the filter mesh 4111. The dust collecting component 42 can automatically collect the particulate impurities and further discharge the particulate impurities. While the particulate impurities in the smoke exhaust pipe 3 are being cleaned, the smoke can flow normally in the inner cavity of the smoke exhaust pipe 3, and will not affect the normal use of the smoke exhaust pipe 3.

[0025] like Figure 1 , Figure 2 , Figure 3 , Figure 5 As shown, as a preferred embodiment of the present invention, the first positioning portion 412 includes two groups of relatively distributed positioning plates 4121 respectively fixedly installed on both sides of the inner cavity of the smoke exhaust pipe 3, and two groups of guide rods 4122 are fixedly installed between the two relatively distributed positioning plates 4121. The guide rods 4122 are slidably connected to the scraper 411, and a first extrusion spring 4123 is fixedly installed on the surface of the positioning plate 4121 below. The first extrusion spring 4123 surrounds the surface of the guide rod 4122 and is connected to the scraper 411.

[0026] The positioning plate 4121 and the guide rod 4122 cooperate with each other to support and position the scraper 411. The first extrusion spring 4123 applies a thrust to the scraper 411. The scraper 411 is at the top of the smoke exhaust pipe 3. When it is necessary to clean the particulate impurities attached to the inner wall of the smoke exhaust pipe 3, the pulling part 413 applies a pulling force to the scraper 411, thereby pulling the scraper 411 to move from top to bottom in the inner cavity of the smoke exhaust pipe 3. At this time, the scraper 411 can perform all-round scraping treatment on the particulate impurities attached to the inner wall of the smoke exhaust pipe 3. When the scraper 411 moves to the lowest point, the pulling part 413 releases the pulling force on the scraper 411, and the first extrusion spring 4123 pushes the scraper 411 to move from bottom to top to its original position.

[0027] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, as a preferred embodiment of the present invention, the pulling part 413 includes a winding roller 4131 fixedly installed at the bottom of the smoke exhaust pipe 3, one end of the winding roller 4131 extends to the outside of the smoke exhaust pipe 3 and is connected to a motor 4132, and a first pulling rope 4133 is fixedly installed on the surface of the scraper 411, and the end of the first pulling rope 4133 away from the scraper 411 passes downward through the positioning plate 4121 and is connected to the winding roller 4131.

[0028] When it is necessary to clean the particulate impurities attached to the inner wall of the smoke exhaust pipe 3, the motor 4132 is started, and the motor 4132 drives the winding roller 4131 to rotate. The winding roller 4131 winds up the first pulling rope 4133 while rotating. The first pulling rope 4133 can pull the scraper 411 from top to bottom in the smoke exhaust pipe 3. After the scraper 411 moves to the lowest point, the motor 4132 drives the winding roller 4131 to reverse. At this time, the winding roller 4131 can continuously loosen the wound first pulling rope 4133, and the first extrusion spring 4123 pushes the scraper 411 from bottom to top to its original position.

[0029] like Figure 2 , Figure 3 , Figure 5 As shown, as a preferred embodiment of the present invention, the second positioning portion 52 includes two groups of relatively distributed vertical grooves 521 opened on the surface of the scraper 411, and a sliding block 523 is slidably installed in the vertical groove 521. The two groups of sliding blocks 523 extend to the outside of the vertical groove 521 and are connected to the two ends of the scraper strip 51. A second extrusion spring 522 is fixedly installed at the bottom end of the vertical groove 521, and the telescopic end of the second extrusion spring 522 is connected to the sliding block 523.

[0030] The second extrusion spring 522 applies a thrust to the sliding block 523, and the sliding block 523 is at the top of the vertical slot 521. The two groups of sliding blocks 523 support and position the scraper 51. At this time, the scraper 51 is at the top of the scraper 411. When the scraper 411 moves in the smoke exhaust pipe 3, the driving unit 53 applies a downward pulling force to the sliding block 523. At this time, the sliding block 523 moves downward in the vertical slot 521, and the two groups of sliding blocks 523 drive the scraper 51 to move synchronously downward on the surface of the scraper 4. The scraper 51 can perform a full range of scraping treatment on the particulate impurities attached to the surface of the scraper 411. After the scraper 51 moves to the bottom of the scraper 411, the driving unit 53 releases the pulling force on the sliding block 523, and the second extrusion spring 522 pushes the sliding block 523 to move to the top of the vertical slot 521, and the sliding block 523 drives the scraper 51 to move synchronously to the top of the scraper 411.

[0031] like Figure 2, Figure 3 , Figure 5 As shown, as a preferred embodiment of the present invention, the driving part 53 includes two groups of relatively distributed side plates 531 fixedly installed at the bottom end of the side wall of the scraper 411, and the two groups of side plates 531 are jointly rotatably installed with a rotating rod 532, and a winding wheel 533 is fixedly installed on the surface of the rotating rod 532. A second pulling rope 536 is fixedly installed on the side wall of the sliding block 523, and the end of the second pulling rope 536 away from the sliding block 523 is connected to the winding wheel 533, and a fixed toothed disc 534 is fixedly installed on the end of the rotating rod 532, and a rack 535 meshing with the fixed toothed disc 534 is fixedly provided on the inner bottom wall of the smoke exhaust pipe 3.

[0032] The scraper 411 moves in the inner cavity of the smoke exhaust pipe 3 and drives the rotating rod 532 to move synchronously. The fixed toothed disc 534 on the surface of the rotating rod 532 rolls along the surface of the rack 535. The fixed toothed disc 534 drives the rotating rod 532 and the winding wheel 533 to rotate. The winding wheel 533 winds up the second pulling rope 536. The second pulling rope 536 pulls the sliding block 523 to move from top to bottom in the vertical groove 521. After the fixed toothed disc 534 is separated from the rack 535, the winding wheel 533 releases the pulling force on the second pulling rope 536, and the second extrusion spring 522 pushes the sliding block 523 to move to the top of the vertical groove 521. The sliding block 523 drives the scraper 51 to move synchronously to the top of the scraper 411.

[0033] like Figure 1 , Figure 2 As shown, as a preferred embodiment of the present invention, the dust collecting assembly 42 includes a dust collecting cylinder 421 fixedly installed at the bottom of the smoke exhaust pipe 3, the dust collecting cylinder 421 is connected to the bottom of the smoke exhaust pipe 3, and an end cover 422 is provided at the bottom of the dust collecting cylinder 421.

[0034] The scraper 411 and the scraper strip 51 scrape and clean the particulate impurities attached to the inner cavity of the smoke exhaust pipe 3. The cleaned particulate impurities fall to the bottom of the smoke exhaust pipe 3 and further fall into the dust collecting tube 421. When the particulate impurities in the dust collecting tube 421 accumulate to a certain extent, the end cover 422 is opened to conveniently discharge the particulate impurities in the dust collecting tube 421.

[0035] like Figure 2 , Figure 3 , Figure 5 As shown, as a preferred embodiment of the present invention, the bottom wall of the scraper 411 is provided with an opening 6 that cooperates with the rack 535 .

[0036] The working principle of the present invention is as follows: initially, the positioning plate 4121 cooperates with the guide rod 4122 to support and position the scraper 411, the first extrusion spring 4123 applies thrust to the scraper 411, the scraper 411 is at the top of the exhaust pipe 3, the second extrusion spring 522 applies thrust to the sliding block 523, and the sliding block 523 is at the top of the vertical slot 521. The smoke in the top fire channel 11 passes through the exhaust pipe 3 and then flows into the boiler body 2. When the smoke flows in the exhaust pipe 3, the smoke will pass through the filter mesh 4111 on the surface of the scraper 411, and a part of the particulate impurities in the smoke will adhere to the inner wall of the exhaust pipe 3, and another part of the particulate impurities in the smoke will adhere to the surface of the filter mesh 4111.

[0037] When the particulate impurities attached to the inner wall of the smoke exhaust pipe 3 and the surface of the scraper 411 reach a certain level, the motor 4132 is started, and the motor 4132 drives the winding roller 4131 to rotate. The winding roller 4131 winds up the first pulling rope 4133 while rotating, and the first pulling rope 4133 can pull the scraper 411 from top to bottom in the smoke exhaust pipe 3. After the scraper 411 moves to the lowest point, the motor 4132 drives the winding roller 4131 to reverse. At this time, the winding roller 4131 can continuously loosen the wound first pulling rope 4133, and the first extrusion spring 4123 pushes the scraper 411 from bottom to top to its original position. The scraper 411 moves back and forth in the inner cavity of the smoke exhaust pipe 3. The scraper 411 can perform an all-round scraping treatment on the particulate impurities attached to the inner wall of the smoke exhaust pipe 3. When the scraper 411 moves back and forth in the smoke exhaust pipe 3, the scraper 411 moves in the inner cavity of the smoke exhaust pipe 3 and drives the rotating rod 532 to move synchronously. The fixed toothed disc 534 on the surface of the rotating rod 532 rolls along the surface of the rack 535. The fixed toothed disc 534 drives the rotating rod 532 and the winding wheel 533 to rotate. The winding wheel 533 winds up the second pulling rope 536, and the second pulling rope 536 pulls the sliding block 523 to move from top to bottom in the vertical groove 521. After the fixed toothed disc 534 is separated from the rack 535, the reel 533 releases the tension on the second pulling rope 536, and the second extrusion spring 522 pushes the sliding block 523 to move to the top of the vertical slot 521, and the sliding block 523 drives the scraper bar 51 to move to the top of the scraper plate 411 synchronously. The scraper bar 51 can perform a full range of scraping treatment on the particle impurities attached to the surface of the filter mesh 4111. When the particle impurities in the dust collecting barrel 421 accumulate to a certain extent, the end cover 422 is opened to conveniently discharge the particle impurities in the dust collecting barrel 421.

[0038] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A calcining furnace preheating smoke exhaust structure, comprising a calcining furnace body and a boiler body, wherein a top layer of fire channel is arranged on the top of the calcining furnace body, and a smoke exhaust pipe is fixedly installed between the calcining furnace body and the boiler body, characterized in that: The smoke exhaust pipe is of a V-shaped structure, one end of the smoke exhaust pipe is connected to the boiler body, and the other end of the smoke exhaust pipe is connected to the top fire channel. The inner cavity of the smoke exhaust pipe is provided with a first ash cleaning mechanism, the first ash cleaning mechanism includes a cleaning component and a dust collecting component, the cleaning component includes a scraper, a first positioning part and a pulling part, the scraper is provided with two groups and is symmetrically located in the smoke exhaust pipe, the scraper surface is provided with a filter mesh, the first positioning part is located in the smoke exhaust pipe and connected to the scraper, the pulling part is located at the bottom of the smoke exhaust pipe and connected to the scraper, and the pulling part cooperates with the first positioning part The scraper is controlled to reciprocate in the smoke exhaust pipe, the dust collecting assembly is located at the bottom end of the smoke exhaust pipe, and the dust collecting assembly is used to collect particulate impurities in the smoke exhaust pipe. Second cleaning mechanisms are respectively provided on both sides of the scraper, and the second cleaning mechanism includes a scraper strip, a second positioning portion and a driving portion. The scraper strip is provided in two groups and is respectively located on both sides of the scraper, the second positioning portion is located on the scraper surface and connected to the scraper strip, and the driving portion is located on the bottom wall of the scraper and connected to the second positioning portion. When the scraper reciprocates in the smoke exhaust pipe, the driving portion controls the scraper strip to synchronously reciprocate on the scraper surface by cooperating with the second positioning portion. The first positioning part includes two sets of relatively distributed positioning plates respectively fixedly installed on both sides of the inner cavity of the smoke exhaust pipe, two sets of guide rods are fixedly installed between the two relatively distributed positioning plates, the guide rods are slidably connected with the scraper, and a first extrusion spring is fixedly installed on the surface of the positioning plate below, the first extrusion spring surrounds the surface of the guide rod and is connected with the scraper; The pulling part includes a winding roller fixedly installed at the bottom of the exhaust pipe, one end of the winding roller extends to the outside of the exhaust pipe and is connected to a motor, a first pulling rope is fixedly installed on the surface of the scraper, and one end of the first pulling rope away from the scraper passes downward through the positioning plate and is connected to the winding roller; The second positioning portion includes two groups of relatively distributed vertical grooves opened on the surface of the scraper, and sliding blocks are slidably installed in the vertical grooves. The two groups of sliding blocks extend to the outside of the vertical grooves and are connected to the two ends of the scraper strip. A second extrusion spring is fixedly installed at the bottom end of the vertical groove, and the telescopic end of the second extrusion spring is connected to the sliding block; The driving part includes two groups of relatively distributed side plates fixedly installed at the bottom end of the scraper side wall, and a rotating rod is installed on the two groups of side plates for common rotation. A winding wheel is fixedly installed on the surface of the rotating rod, and a second pulling rope is fixedly installed on the side wall of the sliding block. The end of the second pulling rope is connected to the winding wheel away from the sliding block, and a fixed toothed disc is fixedly installed on the end of the rotating rod, and a rack meshing with the fixed toothed disc is fixedly provided on the inner bottom wall of the smoke exhaust pipe.

2. A calcining furnace preheating smoke exhaust structure according to claim 1, characterized in that: The dust collecting assembly comprises a dust collecting cylinder fixedly mounted at the bottom end of the smoke exhaust pipe, the dust collecting cylinder is communicated with the inner bottom of the smoke exhaust pipe, and an end cover is arranged at the bottom end of the dust collecting cylinder.

3. The calcining furnace preheating smoke exhaust structure according to claim 1, characterized in that: The bottom wall of the scraper is provided with an opening which cooperates with the rack.

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