Ash removal device for waste heat boiler of calcining furnace

Abstract

The utility model relates to the technical field of ash removal of boiler tubes of waste heat boilers, in particular to an ash removal device for a waste heat boiler of a calcining furnace, which comprises a horizontally arranged square tube, a through round cavity is arranged in the square tube, and a tube wall ash removal mechanism is arranged at the front end of the square tube. The rear end of the pipe wall ash removal mechanism movably extends into the through round cavity in a sealed mode, a rotating mechanism is arranged in the middle of the pipe wall ash removal mechanism, the rear end of the square pipe is connected with a negative pressure collecting pipeline through a flange plate, and a driving walking mechanism and a driven walking mechanism are arranged on the square pipe in the length direction of the square pipe in a spaced mode. The ash removal device for the waste heat boiler of the calcining furnace can be used for boiler pipes with different inner diameters, and the pipe wall ash removal mechanism is driven by the corresponding rotating mechanism to operate during ash removal, so that dust and impurities accumulated on the inner walls of the boiler pipes can be quickly scraped and removed; and the synchronous operation of the double reducing scrapers can effectively improve the scraping effect and efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler tube ash cleaning of a waste heat boiler, in particular to a ash cleaning device for a waste heat boiler of a calcining furnace. Background Art

[0002] During the operation of the calciner waste heat boiler, the dust contained in the calciner flue gas may adhere to the boiler tubes, which will have the following adverse effects on the operation of the waste heat boiler: First, the dust adhering to the boiler tubes will cause the boiler's evaporation volume (gas production) to decrease and the system negative pressure to decrease; second, the furnace needs to be shut down and then manually flushed with high pressure, which will result in reduced production and unstable quality. At the same time, flushing the boiler will also cause corrosion to the boiler tube wall, affecting its service life.

[0003] Therefore, in the prior art, it is necessary to perform regular cleaning operations on the boiler tubes of the waste heat boiler.

[0004] For example, in the patent document with patent publication number CN219735351U, a boiler pipe cleaning device for waste heat power generation is disclosed, whose main structure includes a pipe body and a cleaning component arranged on one side of the pipe body, the cleaning component includes a central axis, a scraper, a surrounding cylinder, a handle and an auger, a central axis is arranged inside the pipe body, and a scraper is fixedly installed on one end of the central axis, and the surface of the scraper is rotatably connected to the surface of the surrounding cylinder, and a handle is also installed on the surface of the surrounding cylinder at an equal angle, and an auger is fixedly installed on the surface of the surrounding cylinder, and the surface of the auger is rotatably connected to the inner surface of the pipe body.

[0005] It can be seen that the above-mentioned existing boiler pipe cleaning device requires the auger and the scraper to be simultaneously sent into the pipe body for operation and construction. This structure is not applicable to the actual cleaning operation of a small-diameter waste heat boiler. The auger needs to occupy a large space and its overall turnover is poor. In addition, it is difficult to send most of the scraped dust into the auger relying solely on the scraper, and the cleaning and collection effect is poor.

[0006] To this end, the utility model aims to improve the problems existing in the prior art when performing dust cleaning operations on the boiler tubes of the waste heat boiler, and specially designs a new calcining furnace waste heat boiler dust cleaning device to better solve the problems existing in the prior art. Utility Model Content

[0007] The utility model is to solve one of the above-mentioned technical problems, and the technical scheme adopted is: a cleaning device for a waste heat boiler of a calcining furnace comprises a horizontally arranged square tube, which in a working state is used to extend to the inside of a boiler tube of the waste heat boiler of the calcining furnace and be coaxially arranged therewith, a through circular cavity is arranged inside the square tube, a tube wall cleaning mechanism is arranged at the front end of the square tube, the rear end of the tube wall cleaning mechanism is movable and sealed to extend into the inside of the through circular cavity, a rotating mechanism is arranged in the middle of the tube wall cleaning mechanism, the rotating mechanism is used to drive its fixed axis to rotate, a negative pressure collection pipe is connected to the rear end of the square tube through a flange, the end of the negative pressure collection pipe is connected to an external negative pressure pump through a retractable corrugated pipeline, a driving walking mechanism and a driven walking mechanism are arranged at intervals on the square tube along its length direction, and a power supply group is installed on the outer side wall of the square tube between the driving walking mechanism and the driven walking mechanism.

[0008] In any of the above schemes, it is preferred that the tube wall cleaning mechanism includes a cylindrical dust collecting tube horizontally and coaxially arranged on the front side of the through circular cavity, a dust collecting cavity is arranged inside the dust collecting tube and its front end is open, the rear end of the dust collecting tube is a hemispherical curved surface, and an inserted circular tube is coaxially and integrally formed on the outer side wall of the rear end of the hemispherical curved surface, the rear end of the inserted circular tube is movable and sealed to extend into the through circular cavity of the square tube; in the cleaning state, the inserted circular tube rotates on a fixed axis inside the through circular cavity, and two variable diameter scrapers are relatively arranged on the outer side wall of the dust collecting tube, and the working ends of the variable diameter scrapers abut against the inner wall of the boiler tube in the cleaning state.

[0009] In any of the above schemes, it is preferred that a plurality of through dust collecting ports are arranged at intervals along the length direction on the outer wall of the dust collecting cylinder between the two variable diameter scrapers, and the interior of each of the through dust collecting ports is respectively connected to the interior of the dust collecting chamber.

[0010] In any of the above schemes, preferably, the rotating mechanism includes a large pulley fixedly sleeved on the outer side wall of the dust collecting barrel, a small pulley is arranged on one side of the large pulley, the large pulley and the small pulley are connected by a toothed belt, a rotating motor is arranged on the rear side of the small pulley, the rotating motor is fixed to the outer side wall of the front end of the square tube through a bracket, and the motor shaft of the rotating motor is coaxially fixed to the center axis of the small pulley.

[0011] In any of the above schemes, it is preferred that the variable diameter scraper includes two fixed screws fixed at intervals on the outer wall of the dust collecting barrel, and a rectangular tool holder is arranged on the outer side of the two fixed screws, and the inner side walls of the rectangular tool holder are movably connected to the outer side of the fixed screw through the corresponding through holes thereon, and a locking nut is screwed on the external threaded side walls of the fixed screw on both sides of the corresponding through holes, and the two oppositely arranged locking nuts cooperate with each other to press the rectangular tool holder in place, and the end of the fixed screw extends into the inner frame of the rectangular tool holder, and a cleaning scraper is detachably fixedly installed on the outer side wall of each rectangular tool holder, and the blade corner of each cleaning scraper abuts against the inner side wall of the boiler tube.

[0012] In any of the above schemes, preferably, the driven walking mechanism comprises a plurality of first electric cylinder groups evenly spaced along the four outer side walls of the square tube, the ends of the piston rods of the first electric cylinder groups are respectively fixedly mounted with first wheel frames, and a driven walking wheel is movably hinged in each of the first wheel frames;

[0013] The driving walking mechanism includes a plurality of second electric cylinder groups evenly spaced along the four outer walls of the square tube, the ends of the piston rods of each of the second electric cylinder groups are fixedly mounted with second wheel frames, a driving walking wheel is movably hinged in each of the second wheel frames, and a driving motor is fixedly mounted on one side outer wall of the second wheel frame corresponding to each of the driving walking wheels, and each of the driving motors is used to drive the driving walking wheel at the corresponding position to rotate as needed.

[0014] In any of the above schemes, preferably, the first electric cylinder group includes two first telescopic electric cylinders arranged at intervals, the two first telescopic electric cylinders are in a synchronous motion state, and the outer ends of the piston rods of the two first telescopic electric cylinders are fixed on the corresponding first wheel frame;

[0015] The second electric cylinder group includes two second telescopic electric cylinders that are spaced apart from each other. The two second telescopic electric cylinders are in a synchronous motion state, and the outer ends of the piston rods of the two second telescopic electric cylinders are fixed on the corresponding second wheel frame.

[0016] In any of the above schemes, preferably, the power supply group includes a plurality of mobile power supplies respectively fixedly mounted on the outer side walls of the square tube, and each of the mobile power supplies is used to supply power to the first electric cylinder group, the second electric cylinder group and each of the drive motors.

[0017] In any of the above schemes, it is preferred that a plurality of O-rings are sleeved at intervals on the outer side wall of the inner inserted circular tube, and the outer side wall of each O-ring abuts against the inner side wall of the through circular cavity.

[0018] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0019] 1. The calcining furnace waste heat boiler cleaning device designed in the utility model can be used for boiler tubes with different inner diameters. When performing the cleaning work, the corresponding rotating mechanism drives the tube wall cleaning mechanism to operate, so as to realize the rapid scraping and cleaning of the dust and impurities accumulated on the inner wall of the boiler tube. The synchronous operation of the double variable diameter scrapers can effectively improve the scraping effect and efficiency.

[0020] 2. The dust particles and impurities removed by scraping can be quickly sucked into the dust collecting tube by the external negative pressure pump and collected by negative pressure adsorption through the internal tube cavity, thereby reducing the dust phenomenon during the cleaning process. At the same time, there is no need to set up dust collection equipment (such as auger, etc.) inside, which can reduce the volume of equipment entering the boiler tube. It can also be applied to the cleaning of small and medium diameter boiler tubes.

[0021] 3. The entire cleaning device can start the driving travel mechanism according to the cleaning requirements. Under the driving action of the driving travel mechanism, the entire device can be driven to move along the inside of the boiler tube to be cleaned, thereby realizing continuous cleaning operations and improving the cleaning range and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, each element or component is not necessarily drawn according to the actual scale.

[0023] Figure 1 It is a structural schematic diagram of the calcining furnace waste heat boiler cleaning device of the utility model when it is in a working state.

[0024] Figure 2 It is a partial cross-sectional structural schematic diagram of the pipe wall cleaning mechanism of the utility model.

[0025] Figure 3 It is a partial structural schematic diagram of the dust collecting barrel of the present utility model.

[0026] Figure 4 This is a schematic diagram of the right side structure of the utility model after the rotating unit is removed.

[0027] Figure 5 It is a three-dimensional structural schematic diagram of the pipe wall cleaning mechanism of the utility model.

[0028] Figure 6 for Figure 5 Schematic diagram of the main structure.

[0029] In the figure, 1, square tube; 2, boiler tube; 3, through circular cavity; 4, flange; 5, negative pressure collection pipe; 6, dust collecting cylinder; 601, hemispherical surface; 7, dust collecting cavity; 8, inserted circular tube; 9, through dust collecting port; 10, large pulley; 11, small pulley; 12, toothed belt; 13, rotating motor; 14, fixing screw; 15, rectangular tool holder; 16, locking nut; 17, cleaning scraper; 18, first wheel frame; 19, driven walking wheel; 20, second wheel frame; 21, driving walking wheel; 22, driving motor; 23, first telescopic electric cylinder; 24, second telescopic electric cylinder; 25, mobile power supply; 26, O-ring. DETAILED DESCRIPTION

[0030] The following is a detailed description of the embodiments of the technical solution of the utility model in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the scope of protection of the utility model. Figure 1-Figure 6 as shown in .

[0031] A calcining furnace waste heat boiler cleaning device comprises a horizontally arranged square tube 1. In the working state, the square tube 1 is used to extend into the boiler tube 2 of the calcining furnace waste heat boiler and be coaxially arranged therewith. A through circular cavity 3 is arranged inside the square tube 1. A tube wall cleaning mechanism is arranged at the front end of the square tube 1. The rear end of the tube wall cleaning mechanism is movable and sealed to extend into the through circular cavity 3. A rotating mechanism is arranged in the middle of the tube wall cleaning mechanism. The rotating mechanism is used to drive its fixed axis rotation. A negative pressure collection pipe 5 is connected to the rear end of the square tube 1 through a flange 4. The end of the negative pressure collection pipe 5 is connected to an external negative pressure pump through a retractable corrugated pipeline. A driving walking mechanism and a driven walking mechanism are arranged at intervals on the square tube 1 along its length direction. A power supply group is installed on the outer wall of the square tube 1 between the driving walking mechanism and the driven walking mechanism. When the calcining furnace waste heat boiler cleaning device of the utility model is in use, the tube wall cleaning mechanism, the driving walking mechanism, and the driven walking mechanism at the front end thereof are all extended to the inside of the boiler tube 2 of the corresponding calcining furnace waste heat boiler to perform cleaning operations. When performing the cleaning operation, it is necessary to turn on the power of the entire device, remotely control the driving walking mechanism to start, and remotely control the rotating mechanism to start. After the rotating mechanism is started, it can drive the corresponding tube wall cleaning mechanism to rotate on a fixed axis, so that the accumulated dust on the inner wall of the current boiler tube 2 can be quickly scraped and removed. Before working, it is necessary to adjust the radial size of each variable diameter scraper on the tube wall cleaning mechanism in advance according to the inner diameter of the current boiler tube 2, so that it can reach a state that it can abut against the inner wall of the boiler tube 2. In addition, in the process of cleaning at the current position, the negative pressure suction of the external negative pressure pump can quickly suck the removed dust particles into the negative pressure collection pipe 5, and then suck them out and collect them, so as to achieve the effect of scraping and cleaning while quickly collecting.

[0032] In any of the above schemes, it is preferred that the tube wall cleaning mechanism includes a cylindrical dust collecting barrel 6 which is horizontally and coaxially arranged on the front side of the through circular cavity 3, a dust collecting cavity 7 is arranged inside the dust collecting barrel 6 and its front end is open, the rear end of the dust collecting barrel 6 is a hemispherical curved surface 601, and an inserted circular tube 8 is coaxially integrally formed on the outer wall of the rear end of the hemispherical curved surface 601, and the rear end of the inserted circular tube 8 is movable and sealed to extend into the through circular cavity 3 of the square tube 1; in the cleaning state, the inserted circular tube 8 rotates on a fixed axis inside the through circular cavity 3, and two variable diameter scrapers are relatively arranged on the outer wall of the dust collecting barrel 6, and the working ends of the variable diameter scrapers abut against the inner wall of the boiler tube 2 in the cleaning state.

[0033] It should be noted that the rear end of the pipe wall cleaning mechanism is integrally movably inserted in the corresponding through circular cavity 3, thereby ensuring the stability of the dust collecting barrel 6 at the front end of the pipe wall cleaning mechanism and the variable diameter scraper installed thereon; under the driving action of the rotating mechanism, the entire dust collecting barrel 6 can be driven to rotate on a fixed axis, thereby driving the inserted circular tube 8 integrally formed and fixedly connected thereto to rotate in the through circular cavity 3 of the square tube 1, and finally driving the two variable diameter scrapers to rotate, thereby achieving the purpose of rapid scraping and cleaning.

[0034] In any of the above schemes, it is preferred that a plurality of through dust collecting ports 9 are arranged at intervals along the length direction on the outer wall of the dust collecting cylinder 6 between the two variable diameter scrapers, and the interior of each through dust collecting port 9 is connected to the interior of the dust collecting chamber 7 respectively.

[0035] The impurities scraped off by the variable diameter scraper are in a free state inside the boiler tube 2. Due to the negative pressure adsorption effect of the negative pressure pump, these impurities can be adsorbed into the through-hole dust collecting port 9 through the negative pressure, and then enter the dust collecting chamber 7, and continue to be transported to the outside for collection through the negative pressure collection pipe 5, effectively improving the efficiency of dust cleaning and collection.

[0036] In any of the above schemes, it is preferred that the rotating mechanism includes a large pulley 10 fixedly sleeved on the outer side wall of the dust collecting barrel 6, a small pulley 11 is arranged on one side of the large pulley 10, the large pulley 10 and the small pulley 11 are connected by a toothed belt 12, a rotating motor 13 is arranged on the rear side of the small pulley 11, the rotating motor 13 is fixed to the outer side wall of the front end of the square tube 1 through a bracket, and the motor shaft of the rotating motor 13 is coaxially fixed to the central axis of the small pulley 11.

[0037] The rotating mechanism mainly relies on a rotating motor 13 as a driving component. When the rotating motor 13 is working, it can drive the corresponding small pulley 11 to rotate, and under the transmission action of the toothed belt 12, it can drive the corresponding large pulley 10 to rotate, and finally drive the dust collecting barrel 6 and the variable diameter scraper installed thereon to rotate and clean the scraper.

[0038] Controlling the rotation speed of the rotary motor 13 can control the speed and effect of scraping.

[0039] In any of the above schemes, it is preferred that the variable diameter scraper includes two fixed screws 14 fixed at intervals on the outer wall of the dust collecting barrel 6, and a rectangular tool holder 15 is arranged on the outer side of the two fixed screws 14, and the inner side walls of the rectangular tool holder 15 are movably sleeved on the outer side of the fixed screw 14 through the corresponding through holes thereon, and a locking nut 16 is screwed on the external threaded side walls of the fixed screw 14 on both sides of the corresponding through holes. The two oppositely arranged locking nuts 16 cooperate with each other to press the rectangular tool holder 15 into position, and the end of the fixed screw 14 extends into the inner frame of the rectangular tool holder 15, and a cleaning scraper 17 is detachably fixedly installed on the outer side wall of each rectangular tool holder 15, and the blade corners of each cleaning scraper 17 abut against the inner side wall of the boiler tube 2.

[0040] The variable diameter scraper designed in the utility model can adjust the rectangular tool holder 15 along the radial direction of the boiler tube 2 by loosening or tightening each locking nut 16. After adjusting to the right position, locking the corresponding locking nut 16 again can realize the positioning of the cleaning scraper 17 thereon, thereby effectively ensuring that the current variable diameter scraper can complete the cleaning operation on boiler tubes 2 with different inner diameters.

[0041] In addition, the corresponding cleaning scraper 17 can be quickly replaced according to different cleaning requirements, and the cleaning scraper 17 is designed to be detachable to facilitate quick cleaning and maintenance.

[0042] In any of the above schemes, it is preferred that the driven walking mechanism includes a plurality of first electric cylinder groups evenly spaced along the four outer walls of the square tube 1, and the ends of the piston rods of each of the first electric cylinder groups are respectively fixedly mounted with a first wheel frame 18, and a driven walking wheel 19 is movably hinged in each of the first wheel frames 18.

[0043] The driving walking mechanism includes a plurality of second electric cylinder groups evenly spaced along the four outer walls of the square tube 1, and a second wheel frame 20 is fixedly mounted on the end of the piston rod of each of the second electric cylinder groups, and a driving walking wheel 21 is movably hinged in each of the second wheel frames 20, and a driving motor 22 is fixedly mounted on one side outer wall of the second wheel frame 20 corresponding to each of the driving walking wheels 21, and each of the driving motors 22 is used to drive the driving walking wheel 21 at the corresponding position to rotate as needed.

[0044] Both the driven walking mechanism and the driving walking mechanism can be controlled according to the size of the inner diameter of the current boiler tube 2, specifically controlling the corresponding first electric cylinder group and the second electric cylinder group to extend and retract to the corresponding length until the driving walking wheel 21 and the driven walking wheel 19 abut against the inner wall of the corresponding boiler tube 2.

[0045] In any of the above schemes, preferably, the first electric cylinder group includes two first telescopic electric cylinders 23 arranged at an interval, the two first telescopic electric cylinders 23 are in a synchronous motion state, and the outer ends of the piston rods of the two first telescopic electric cylinders 23 are fixed on the corresponding first wheel frame 18.

[0046] The second electric cylinder group includes two second telescopic electric cylinders 24 arranged at an interval, the two second telescopic electric cylinders 24 are in a synchronous motion state, and the outer ends of the piston rods of the two second telescopic electric cylinders 24 are fixed on the corresponding second wheel frame 20.

[0047] In any of the above schemes, it is preferred that the power supply group includes a plurality of mobile power supplies 25 respectively fixedly mounted on the outer wall of the square tube 1, and each mobile power supply 25 is used to supply power to the first electric cylinder group, the second electric cylinder group and each driving motor 22 respectively.

[0048] The use of a mobile power source 25 can ensure the power supply of the entire device during operation, and can also be quickly charged as needed.

[0049] In any of the above schemes, it is preferred that a plurality of O-rings 26 are sleeved at intervals on the outer wall of the inner insert circular tube 8 , and the outer wall of each O-ring 26 abuts against the inner wall of the through circular cavity 3 .

[0050] The O-ring 26 can play an effective sealing role to ensure the effect of negative pressure dust collection.

[0051] Specific working principle: When the device is in use, the tube wall cleaning mechanism, driving travel mechanism, and driven travel mechanism at the front end of the device are extended to the inside of the boiler tube 2 of the corresponding calcining furnace waste heat boiler to perform cleaning operations. Before the operation, the radial dimensions of each variable diameter scraper on the tube wall cleaning mechanism need to be adjusted in advance according to the current inner diameter of the boiler tube 2, so that it can reach a state that it can abut against the inner wall of the boiler tube 2.

[0052] When the dust cleaning operation is performed, the power supply of the entire device needs to be turned on, and the remote control drives the walking mechanism and the rotating mechanism to start.

[0053] After the rotating mechanism is started, it can drive the corresponding variable-diameter scraper installed on the dust collecting barrel 6 to rotate on a fixed axis, so that the dust accumulated on the inner wall of the current boiler tube 2 can be quickly scraped and removed.

[0054] During the dust cleaning process, the removed dust particles can be quickly sucked into the negative pressure collection pipe 5 by relying on the negative pressure suction force of the external negative pressure pump, and then sucked out and collected, so as to achieve the effect of scraping and cleaning while quickly collecting.

[0055] In summary, it can be seen that the calcining furnace waste heat boiler ash cleaning device can be used for boiler tubes 2 with different inner diameters. When performing ash cleaning work, the corresponding rotating mechanism drives the tube wall ash cleaning mechanism to operate, which can realize the rapid scraping and cleaning of dust and impurities accumulated on the inner wall of the boiler tube 2. The synchronous operation of the double variable diameter scraper can effectively improve the scraping effect and efficiency; the entire cleaning device can start the driving walking mechanism according to the ash cleaning requirements, and under the driving action of the driving walking mechanism, it can drive the entire device to move along the inside of the boiler tube 2 to be cleaned, so as to realize continuous ash cleaning operation and improve the cleaning range and efficiency; the dust particles and impurities cleaned by scraping can cooperate with the external negative pressure pump to realize the rapid suction of the dust collecting tube 6 and collect them through the internal tube cavity to the outside negative pressure adsorption, thereby reducing the dust phenomenon during the cleaning process. At the same time, there is no need to set up dust collection equipment inside, which can reduce the volume of the equipment entering the boiler tube 2, and it can also be suitable for the cleaning of small and medium diameter boiler tubes 2.

[0056] The above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model. For technicians in this technical field, any replacement improvements or changes made to the implementation methods of the utility model fall within the protection scope of the utility model.

[0057] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. The calcining furnace waste heat boiler ash cleaning device is characterized by: It comprises a horizontally arranged square tube, which in the working state is used to extend to the inside of the boiler tube of the waste heat boiler of the calcining furnace and be coaxially arranged therewith, a through circular cavity is arranged inside the square tube, a tube wall cleaning mechanism is arranged at the front end of the square tube, the rear end of the tube wall cleaning mechanism is movable and sealed to extend into the inside of the through circular cavity, a rotating mechanism is arranged in the middle of the tube wall cleaning mechanism, the rotating mechanism is used to drive its fixed axis rotation, a negative pressure collection pipe is connected to the rear end of the square tube through a flange, the end of the negative pressure collection pipe is connected to an external negative pressure pump through a retractable corrugated pipe, a driving walking mechanism and a driven walking mechanism are arranged on the square tube at intervals along its length direction, and a power supply group is installed on the outer wall of the square tube between the driving walking mechanism and the driven walking mechanism.

2. The calcining furnace waste heat boiler ash cleaning device according to claim 1 is characterized in that: The tube wall cleaning mechanism includes a cylindrical dust collecting tube horizontally and coaxially arranged on the front side of the through circular cavity, a dust collecting cavity is arranged inside the dust collecting tube and its front end is open, the rear end of the dust collecting tube is a hemispherical curved surface, an inserted circular tube is coaxially and integrally formed on the outer side wall of the rear end of the hemispherical curved surface, the rear end of the inserted circular tube is movable and sealed to extend into the through circular cavity of the square tube; in the cleaning state, the inserted circular tube rotates on a fixed axis inside the through circular cavity, two variable diameter scrapers are relatively arranged on the outer side wall of the dust collecting tube, and the working ends of the variable diameter scrapers abut against the inner wall of the boiler tube in the cleaning state.

3. The calcining furnace waste heat boiler ash cleaning device according to claim 2 is characterized in that: A plurality of through dust collecting ports are arranged at intervals along the length direction of the dust collecting cylinder on the outer side wall between the two variable diameter scrapers, and the interior of each of the through dust collecting ports is connected to the interior of the dust collecting cavity.

4. The calcining furnace waste heat boiler ash cleaning device according to claim 3 is characterized in that: The rotating mechanism includes a large pulley fixedly sleeved on the outer side wall of the dust collecting barrel, a small pulley is arranged on one side of the large pulley, the large pulley and the small pulley are connected by a toothed belt, a rotating motor is arranged on the rear side of the small pulley, the rotating motor is fixed to the outer side wall of the front end of the square tube through a bracket, and the motor shaft of the rotating motor is coaxially fixedly connected with the central axis of the small pulley.

5. The calcining furnace waste heat boiler ash cleaning device according to claim 4, characterized in that: The variable diameter scraper includes two fixing screws fixed at intervals on the outer wall of the dust collecting barrel, a rectangular tool holder is arranged on the outer side of the two fixing screws, the inner side walls of the rectangular tool holder are movably sleeved on the outer side of the fixing screws through corresponding through holes thereon, a locking nut is screwed on the external threaded side walls of the fixing screws on both sides of the corresponding through holes, the two oppositely arranged locking nuts cooperate with each other to press the rectangular tool holder in place, the end of the fixing screw extends into the inner frame of the rectangular tool holder, and a cleaning scraper is detachably fixedly installed on the outer side wall of each rectangular tool holder, and the blade corners of each cleaning scraper abut against the inner side wall of the boiler tube.

6. The calcining furnace waste heat boiler ash cleaning device according to claim 5, characterized in that: The driven walking mechanism comprises a plurality of first electric cylinder groups evenly spaced along the four outer side walls of the square tube, the ends of the piston rods of the first electric cylinder groups are respectively fixedly mounted with first wheel frames, and a driven walking wheel is respectively movably hinged in each of the first wheel frames; The driving walking mechanism includes a plurality of second electric cylinder groups evenly spaced along the four outer walls of the square tube, the ends of the piston rods of each of the second electric cylinder groups are fixedly mounted with second wheel frames, a driving walking wheel is movably hinged in each of the second wheel frames, and a driving motor is fixedly mounted on one side outer wall of the second wheel frame corresponding to each of the driving walking wheels, and each of the driving motors is used to drive the driving walking wheel at the corresponding position to rotate as needed.

7. The calcining furnace waste heat boiler ash cleaning device according to claim 6, characterized in that: The first electric cylinder group comprises two first telescopic electric cylinders arranged at intervals, the two first telescopic electric cylinders are in a synchronous motion state, and the outer ends of the piston rods of the two first telescopic electric cylinders are fixed on the corresponding first wheel frame; The second electric cylinder group includes two second telescopic electric cylinders that are spaced apart from each other. The two second telescopic electric cylinders are in a synchronous motion state, and the outer ends of the piston rods of the two second telescopic electric cylinders are fixed on the corresponding second wheel frame.

8. The calcining furnace waste heat boiler ash cleaning device according to claim 7, characterized in that: The power supply group includes a plurality of mobile power supplies respectively fixedly mounted on the outer side walls of the square tube, and each of the mobile power supplies is used to supply power to the first electric cylinder group, the second electric cylinder group and each of the drive motors.

9. The calcining furnace waste heat boiler ash cleaning device according to claim 8, characterized in that: A plurality of O-type sealing rings are sleeved at intervals on the outer side wall of the inner inserting circular tube, and the outer side wall of each O-type sealing ring abuts against the inner side wall of the through circular cavity respectively.

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