Hot blower combustion chamber inner hole polishing device and method

Abstract

A hot blower combustion chamber inner hole polishing device comprises a platform, and a roller carrier assembly and a pressing device are installed on the platform and used for being matched with each other to clamp and fix a workpiece. A polishing wheel assembly for polishing a workpiece is mounted on the platform on one transverse side of the roller carrier assembly, and the polishing wheel assembly is mounted on the platform through a reciprocating driving motor assembly; the polishing wheel assembly comprises a transverse adjusting plate, a rotating motor plate and a lifting air cylinder used for driving the rotating motor plate to rotate are hinged to the transverse adjusting plate, a polishing shaft is installed on the rotating motor plate through a bearing seat, and a polishing wheel is installed on the polishing shaft. A motor used for driving the polishing shaft to drive the polishing wheel to polish the workpiece is further installed on the rotating motor plate, and the motor is in transmission connection with the polishing shaft through a belt wheel and a belt. The device can quickly remove the oxide skin of the inner hole of the seamless steel pipe of the combustion chamber of the hot blower, and is good in effect, high in efficiency and low in cost.

Description

Technical Field

[0001] This invention relates to the field of hot air blower combustion chamber treatment technology, and in particular to a hot air blower combustion chamber inner hole polishing device, and more specifically to a polishing method using the above-mentioned hot air blower combustion chamber inner hole polishing device. Background Technology

[0002] The current hot air blower combustion chamber uses a seamless steel pipe with a diameter of φ180mm × 4mm, made of Q235B carbon structural steel, as its main structure. Under continuous high-temperature combustion conditions (working temperature can reach 600-800℃), a severe oxidation reaction occurs on the inner wall surface, forming a layered oxide scale (mainly a mixture of Fe3O4 and Fe2O3) with a thickness of 0.5-1.2mm. As the equipment's operating cycle extends, the oxide scale cracks and peels off under the action of thermal stress cycles. The detached iron oxide debris enters the air knife system with the airflow, leading to the following serious problems: 1. The nozzle orifice (φ2-3mm) of the air knife is blocked by oxide scale particles with a diameter of 0.3-1.5mm; 2. The uniformity of airflow distribution decreases by 35%-50%, causing the workpiece heating temperature difference to exceed ±15℃; 3. The machine needs to be shut down for 6-8 hours each month for manual cleaning, which increases maintenance costs by 40%.

[0003] Limitations of existing technical solutions: 1. Traditional mechanical polishing: When using a handheld grinder, the processing time for a single piece can be as long as 45 minutes, and it is difficult to guarantee the uniformity of circumferential polishing of the inner wall of a φ180mm pipe. 2. Chemical pickling: requires soaking in a 15% hydrochloric acid solution, resulting in wastewater containing heavy metals with treatment costs as high as 2,000 yuan / m³; 3. Sandblasting: Using Al2O3 sand particles (0.2-0.5mm in diameter) under a pressure of 0.6MPa, the pipe wall thinning amount reaches 0.08-0.12mm / time. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing a polishing device for the inner bore of a hot air blower combustion chamber that can quickly remove oxide scale from the inner bore of the seamless steel pipe of the hot air blower combustion chamber. By applying this device, the reliability of the hot air blower combustion chamber can be significantly improved, the equipment maintenance cycle can be extended from once a week to once a quarter, saving approximately 120,000 yuan in maintenance costs annually, while ensuring the stability of product heating quality, resulting in significant economic and social benefits.

[0005] The technical problem to be solved by the present invention is achieved through the following technical solution. The present invention is a polishing device for the combustion chamber of a hot air blower, comprising a platform, on which a roller frame assembly and a clamping device are mounted for clamping and fixing the workpiece; a polishing wheel assembly for polishing the workpiece is mounted on the platform on the lateral side of the roller frame assembly, and the polishing wheel assembly is mounted on the platform via a reciprocating drive motor assembly; The polishing wheel assembly includes a horizontal adjustment plate, a rotary motor plate and a lifting cylinder for driving the rotary motor plate to rotate are hinged on the horizontal adjustment plate, a polishing shaft is mounted on the rotary motor plate through a bearing seat, a polishing wheel is mounted on the polishing shaft, and a motor for driving the polishing shaft to drive the polishing wheel to polish the workpiece is also mounted on the rotary motor plate. The motor is connected to the polishing shaft through a pulley and a belt. In use, the roller frame assembly and clamping device clamp and fix the workpiece, the reciprocating drive motor assembly drives the polishing wheel assembly to move laterally to the inner hole of the workpiece, the lifting cylinder drives the rotary motor plate to rotate, so that the polishing wheel contacts the inner hole of the workpiece, and the motor drives the polishing shaft and polishing wheel to rotate through the pulley and belt, polishing the inner hole of the hot blower combustion chamber. The spiral trajectory is achieved by the rotation direction of the polishing wheel being opposite to the lateral movement direction of the reciprocating drive motor assembly.

[0006] The technical problem to be solved by the present invention can also be further achieved by the following technical solution: For the hot air blower combustion chamber hole polishing device described above, the roller frame assembly includes a horizontally arranged fixed seat, a drive shaft and a motor reducer for driving the drive shaft to rotate are installed on the fixed seat, the drive shaft is installed on the fixed seat through a bearing seat, a plurality of drive wheels are installed on the drive shaft, an adjusting seat is installed on a platform on one longitudinal side of the fixed seat, the adjusting seat is installed on the platform through a longitudinally arranged slide rail and adjusting screw, a driven shaft is installed on the adjusting seat, and a plurality of driven wheels for cooperating with the drive wheels to support the workpiece are installed on the driven shaft; A limiting seat for cooperating with the adjusting seat is also installed on the platform on the longitudinal side of the adjusting seat.

[0007] The technical problem to be solved by the present invention can also be further achieved by the following technical solution: For the hot air blower combustion chamber hole polishing device described above, the pressing device includes a vertically arranged fixed frame, a linear rail that cooperates with the fixed frame is installed on the platform, the linear rail is arranged horizontally, a cylinder is installed on the top of the fixed frame through a cylinder fixing plate, and a pressure roller assembly for pressing and fixing the workpiece is installed at the piston rod end of the cylinder.

[0008] The technical problem to be solved by the present invention can also be further achieved by the following technical solution: For the hot air blower combustion chamber hole polishing device described above, the transverse adjustment plate is mounted on the reciprocating drive motor assembly through a longitudinally arranged guide rail slider structure, the guide rail of the guide rail slider structure is mounted on the reciprocating drive motor assembly, the slider of the guide rail slider structure is mounted on the transverse adjustment plate, and an adjustment screw for finely adjusting the transverse position of the transverse adjustment plate is also installed on the guide rail of the guide rail slider structure.

[0009] The technical problem to be solved by the present invention can also be further achieved by the following technical solution: For the hot air blower combustion chamber hole polishing device described above, the reciprocating drive motor assembly includes a linear guide rail horizontally mounted on the platform, a motor reducer mounted on the linear guide rail via a motor fixing plate, a gear mounted on the motor shaft of the motor reducer, a rack mounted on the linear guide rail for cooperating with the gear, and a polishing wheel assembly mounted on the motor fixing plate. Limit switches are also installed on both sides of the linear guide rail to cooperate with the motor mounting plate.

[0010] The technical problem to be solved by the present invention can also be further achieved by the following technical solution: For the hot blower combustion chamber hole polishing device described above, the device adopts a symmetrical layout design of double polishing wheel assembly, that is, two sets of polishing wheel assemblies are set and respectively installed on both sides of the roller frame assembly. One set of polishing wheel assembly starts polishing from the left end of the inner hole of the workpiece, and the other set of polishing wheel assembly cuts in from the middle of the inner hole of the workpiece. The two sets of polishing wheel assemblies move to the right synchronously and each completes the spiral trajectory polishing of half of the inner hole.

[0011] The technical problem to be solved by the present invention can also be further achieved by the following technical solution: For the hot blower combustion chamber hole polishing device described above, an infrared temperature sensor and a coolant nozzle are set on the platform at the roller frame assembly. The temperature of the polishing area is monitored in real time by the infrared temperature sensor, and the spray flow rate and angle of the coolant sprayed by the coolant nozzle are adjusted so that the coolant covers the contact area between the inner hole of the workpiece and the polishing wheel, thereby cooling the surface of the workpiece.

[0012] The technical problem to be solved by the present invention can also be further achieved through the following technical solution: For the hot air blower combustion chamber hole polishing device described above, a hot air blower combustion chamber hole polishing method comprises the following steps: (1) Workpiece clamping: The combustion chamber workpiece is placed between the driving wheel and the driven wheel of the roller frame assembly; Adjusting the adjusting screw causes the adjusting seat to move longitudinally, so that the driven wheel and the driving wheel cooperate to clamp the workpiece; Start the clamping device, and the cylinder drives the pressure roller assembly to press down on the top of the workpiece to achieve three-point positioning; (2) Polishing parameter settings: The angle of the rotary motor plate is adjusted by the lifting cylinder to make the polishing wheel contact the inner wall of the workpiece. The speed of the motor reducer is set to 8-15 rpm, and the moving speed of the reciprocating drive motor assembly is set to 50-200 mm / min; Set the axial feed rate of the polishing wheel to 0.5-2 mm / pass; (3) Automated polishing: Start the drive shaft motor and reducer to drive the workpiece to rotate; Simultaneously start the polishing wheel motor and the reciprocating drive motor assembly; The polishing wheel rotates in the opposite direction to the workpiece, and under the combined action of rotational friction and axial reciprocating motion, it polishes the inner hole wall in a spiral trajectory. The polishing wheel is controlled to reciprocate within the effective length range of the workpiece by a limit switch. At the same time, the motor current value is monitored in real time. When the current suddenly increases and exceeds the set threshold, the equipment is paused and the wear condition of the polishing wheel is checked. (4) Quality inspection: After polishing, the surface roughness of the inner hole is tested using a roughness tester. Specifically, at least three measurement points are evenly selected on the inner hole wall of the workpiece using a roughness tester, and the surface roughness is measured at each point. The average roughness value Ra of all measurement points is then calculated. When Ra value > 0.8 μm, repeat step (3) for secondary polishing; When Ra value ≤ 0.8 μm, loosen the clamping device and roller frame assembly to remove the workpiece.

[0013] The technical problem to be solved by the present invention can also be further realized by the following technical solution: For the above-mentioned hot air blower combustion chamber hole polishing method, an elastic buffer sleeve is added to the polishing shaft, and the polishing wheel is installed on the elastic buffer sleeve. In step (2), the position of the transverse adjustment plate is finely adjusted by adjusting the screw, so that the initial position of the polishing wheel is offset from the workpiece axis by 1-3mm, forming an eccentric polishing trajectory.

[0014] The technical problem to be solved by the present invention can also be further achieved through the following technical solution: For the above-described hot air blower combustion chamber bore polishing method, a pressure sensor is installed at the junction of the lifting cylinder and the rotary motor plate to measure the contact pressure between the polishing wheel and the inner wall of the workpiece bore. The contact pressure between the polishing wheel and the inner wall of the workpiece bore is adjusted by the lifting cylinder according to the pressure condition. In the initial polishing stage, a larger contact pressure is used to quickly remove burrs and oxide layers from the workpiece surface; in the intermediate polishing stage, the contact pressure is gradually reduced to perform fine polishing on the workpiece surface; in the final polishing stage, a smaller contact pressure is used for finishing treatment so that the workpiece surface meets the required roughness requirements.

[0015] Compared with existing technologies, this invention addresses the problem of oxide scale shedding from the inner bore of a hot air blower combustion chamber during high-temperature combustion. It proposes a highly efficient polishing solution. Existing hot air blower combustion chambers are made of Q235B seamless steel pipe with a specification of φ180×4. During combustion, oxide scale detaches from the inner bore, clogging the air knife and causing airflow blockage, thus affecting the blowing effect. This invention places the combustion chamber on a roller frame, applies pressure to the combustion chamber using a clamping device, and drives the combustion chamber to rotate clockwise via a motor reducer. The polishing wheel also rotates clockwise, and under the gravity of the polishing wheel assembly, a polishing force is applied to the inner bore of the combustion chamber. The surface roughness of the inner bore of the polished combustion chamber is Ra0.8, meeting the usage requirements. The advantages are: 1. Improve efficiency and quality in a coordinated manner By using a rotary friction and gravity adaptive coupling polishing mechanism, dynamic peeling of oxide scale on the inner wall of the combustion chamber is achieved. While maintaining the uniform rotation of the φ180mm pipe (8-15rpm), the polishing wheel generates a continuous micro-oscillation polishing force under the action of gravity component, which shortens the processing time of a single piece from the traditional 40-60 minutes to 8-12 minutes, and the surface roughness stably reaches Ra0.6-0.8μm, which is two precision levels higher than mechanical grinding. 2. Fundamental improvement in process reliability The innovative non-contact pressure control system replaces the traditional rigid pressurization with the gravity (2-5kg adjustable) of the polishing wheel assembly, avoiding pipe wall deformation caused by local overload (roundness error ≤0.3mm). After verification by 200 continuous operations, the oxide scale removal rate exceeds 99%, completely eliminating the hidden danger of air knife blockage, and improving the airflow distribution uniformity to within ±5%. 3. Dual optimization of economy and environmental protection 3.1 Cost Reduction: The cost per unit is reduced to one-third of the traditional method, with labor costs decreasing by 80% and consumable costs decreasing by 65%; 3.2 Green manufacturing: Completely abandon chemical pickling process, dust concentration in the working environment ≤2mg / m³, and noise control below 75dB(A); 3.3 Equipment compatibility: The modular design is compatible with combustion chambers of φ150-220mm, and the pressure parameters (100-500N) and polishing wheel hardness (HRC45-55) are adjustable to meet the processing needs of different materials (carbon steel / alloy steel). Attached Figure Description

[0016] Figure 1 This is a schematic diagram of one structure of the present invention; Figure 2 This is a schematic diagram of the roller frame assembly of the present invention; Figure 3 This is a schematic diagram of the pressing device of the present invention; Figure 4 This is a schematic diagram of the polishing wheel assembly of the present invention; Figure 5 This is a schematic diagram of the reciprocating drive motor assembly of the present invention; Figure 6 This is a schematic diagram of the initial state of the present invention; Figure 7 This is a schematic diagram of the material feeding state of the present invention; Figure 8 This is a schematic diagram of the working state of the polishing wheel assembly of the present invention. Figure 1 ; Figure 9 This is a schematic diagram of the working state of the polishing wheel assembly of the present invention. Figure 2 ; Figure 10 This is a diagram illustrating one usage state of the present invention. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Reference Figure 1-10 A hot air blower combustion chamber hole polishing device includes a platform 2, which serves as the basic support structure for the entire polishing device and is made of welded steel plates. A roller frame assembly 3 and a clamping device 5 are installed on the platform 2 for clamping and fixing the workpiece 1 in cooperation with each other. The roller frame assembly 3 includes a horizontally arranged fixed seat 14. A drive shaft 11 and a motor reducer 10 for driving the drive shaft 11 to rotate are installed on the fixed seat 14. The drive shaft 11 is mounted on the fixed seat 14 through a bearing seat 13. Several drive wheels 12 are mounted on the drive shaft 11. An adjusting seat 15 is installed on the platform 2 on the longitudinal side of the fixed seat 14. The adjusting seat 15 is mounted on the platform 2 through a longitudinally arranged slide rail 17 and an adjusting screw 18. A driven shaft is installed on the adjusting seat 15. Several driven wheels 16 are mounted on the driven shaft for cooperating with the drive wheels 12 to support the workpiece 1. The motor reducer 10 is the power source, which transmits power to the drive wheel 12 through the transmission shaft, driving the drive wheel 12 to rotate clockwise. This, in turn, cooperates with the driven wheel 16 to rotate the workpiece 1, so as to better polish the workpiece 1. By rotating the adjusting screw 18, the adjusting seat 15 can be moved longitudinally along the slide rail 17, thereby adjusting the distance between the driven wheel 16 and the drive wheel 12. This allows the roller frame assembly 3 to adapt to workpieces 1 of different specifications. When changing to seamless steel pipes of different diameters, only the adjusting screw needs to be adjusted to make the drive wheel 12 and the driven wheel 16 accurately cooperate to effectively support and drive the workpiece 1.

[0019] Preferably, a limiting seat 19 for cooperating with the adjusting seat 15 is also installed on the platform 2 on the longitudinal side of the adjusting seat 15 to limit the range of movement of the adjusting seat 15, prevent the adjusting seat 15 from exceeding the reasonable position during the adjustment process, and ensure the safety and stability of the device.

[0020] The function of the clamping device 5 is to clamp the workpiece 1, increase the rotational friction, prevent the workpiece 1 from jumping up during rotation, and ensure the smooth progress of the polishing process. Specifically, the clamping device 5 includes a vertically arranged fixed frame 21, and a linear guide 20 that cooperates with the fixed frame 21 is installed on the platform 2. The linear guide 20 is arranged horizontally, so that the fixed frame 21 can move laterally along the linear guide 20, which can easily adapt to the clamping position requirements of workpieces 1 of different lengths. When the length of the workpiece 1 changes, only the fixed frame 21 needs to be moved to adjust the pressure roller assembly 24 to the appropriate clamping position. A cylinder 23 is mounted on the top of the fixed frame 21 via a cylinder fixing plate 22. A pressure roller assembly 24 for pressing and fixing the workpiece 1 is mounted on the piston rod end of the cylinder 23. Under the action of the cylinder 23, the piston rod extends and drives the pressure roller assembly 24 to move downward, pressing the workpiece 1 and generating sufficient rotational friction force so that the workpiece 1 rotates stably under the drive of the roller frame assembly 3. Preferably, the pressure roller assembly consists of a pressure roller frame and four symmetrically distributed pressure rollers mounted on the pressure roller frame. The pressure rollers can rotate around their own axis to reduce frictional damage to the surface of the workpiece.

[0021] A polishing wheel assembly 5 for polishing workpiece 1 is installed on platform 2 on the lateral side of roller frame assembly 3. The polishing wheel assembly 5 is mounted on platform 2 via reciprocating drive motor assembly 6. The polishing wheel assembly 5 includes a lateral adjustment plate 38, a rotary motor plate 36 and a lifting cylinder 37 for driving the rotary motor plate 36 to rotate are hinged to the lateral adjustment plate 38, a polishing shaft 34 is mounted on the rotary motor plate 36 via a bearing seat, a polishing wheel 35 is mounted on the polishing shaft 34, and a motor 30 for driving the polishing shaft 34 to drive the polishing wheel 35 to polish workpiece 1 is also mounted on the rotary motor plate 36. The motor 30 is connected to the polishing shaft 34 via pulley 31 and belt 32. The motor 30 drives the polishing shaft 34 to rotate via pulley 31 and belt 32. The polishing wheel 35 is mounted on the polishing shaft 34 and rotates at high speed together with the polishing shaft 34. The high-speed rotating polishing wheel 35 contacts the inner hole of the workpiece 1 and removes the oxide scale in the inner hole through friction, thus achieving polishing. When the lifting cylinder 37 rises, it drives the rotating motor plate 36 to rise, and the polishing wheel 35 also rises, increasing the distance between it and the inner hole of the workpiece 1, and finally separating from the workpiece 1. At this time, the loading and unloading operation of the workpiece 1 can be easily carried out. When the lifting cylinder 37 descends, it drives the rotating motor plate 36 to descend, and the polishing wheel 35 descends and contacts the workpiece 1. The downward pressure generated by the weight of the mechanism begins to polish the inner hole of the workpiece 1.

[0022] Preferably, the transverse adjustment plate 38 is mounted on the reciprocating drive motor assembly 6 via a longitudinally arranged guide rail slider structure 39. The guide rail of the guide rail slider structure 39 is mounted on the reciprocating drive motor assembly 6, and the slider of the guide rail slider structure 39 is mounted on the transverse adjustment plate 38. An adjusting screw 40 for cooperating with the transverse adjustment plate 38 is also installed on the guide rail of the guide rail slider structure 39. By rotating the adjusting screw 40, the transverse adjustment plate 38 can be moved laterally along the guide rail, thereby adjusting the radial position of the polishing wheel 35 in the inner hole of the workpiece 1. This allows the polishing device to adapt to seamless steel pipes with different inner diameters. By adjusting the radial position of the polishing wheel 35, it is ensured that the polishing wheel 35 can accurately act on different parts of the inner hole of the workpiece 1, achieving comprehensive and effective polishing.

[0023] The function of the reciprocating drive motor assembly 6 is to drive the polishing wheel assembly 5 to reciprocate, enabling the polishing wheel 35 to uniformly polish the inner hole of the workpiece 1. Specifically, the reciprocating drive motor assembly 6 includes a linear guide rail 45 horizontally mounted on the platform 2. A motor reducer 41 is mounted on the linear guide rail 45 via a motor mounting plate 44. A gear 42 is mounted on the motor shaft of the motor reducer 41. A rack 43 for cooperating with the gear 42 is mounted on the linear guide rail 45. The polishing wheel assembly 5 is mounted on the motor mounting plate. The motor reducer 41 drives the motor mounting plate 44 to move linearly on the linear guide rail 45 via the gear 42 and rack 43. Since the polishing wheel assembly 5 is mounted on the motor mounting plate 44, it also moves linearly accordingly, facilitating the comprehensive polishing of the inner hole of the workpiece 1.

[0024] Preferably, limit switches 46 for cooperating with motor mounting plate 44 are also installed on both sides of linear guide rail 45. The limit switches 46 ensure the accuracy and reliability of the reciprocating motion of polishing wheel assembly 5, prevent motor mounting plate 44 from exceeding the range of movement, and protect the safe operation of the device.

[0025] In practical applications, to improve polishing efficiency and processing quality, a symmetrical layout design of dual polishing wheel assemblies 5 is adopted. That is, two sets of polishing wheel assemblies 5 are set and installed on both sides of the roller frame assembly 3 respectively. One set of polishing wheel assemblies 5 starts polishing from the left end of the inner hole of the workpiece 1, while the other set of polishing wheel assemblies 5 cuts in from the middle. The two sets of polishing wheel assemblies 5 move to the right synchronously and each completes the half-stroke spiral trajectory polishing of the inner hole. Through spatial segmentation coverage and parameter coordinated control, a high-efficiency precision processing effect is achieved, with a 50% reduction in single-piece processing time and a stable surface roughness Ra value ≤0.8μm.

[0026] To ensure polishing effect, an infrared temperature sensor and a coolant nozzle are installed on the platform of the roller frame assembly 3. The infrared temperature sensor monitors the temperature of the polishing area in real time, and adjusts the spray flow rate and angle of the coolant sprayed by the coolant nozzle according to the monitoring results to ensure that the coolant accurately covers the contact area between the inner hole of the workpiece 1 and the polishing wheel, thereby reducing the surface temperature of the workpiece 1.

[0027] The actual working process of the hot air blower combustion chamber bore polishing device in this application is as follows: (1) Workpiece clamping: Place the combustion chamber workpiece between the driving and driven wheels of the roller frame assembly to ensure accurate initial positioning of the workpiece; Adjusting the adjusting screw moves the adjusting seat longitudinally, causing the driven wheel to engage with the driving wheel to clamp the workpiece securely, preventing loosening or displacement during subsequent polishing. The clamping device is activated, and the cylinder drives the pressure roller assembly to press down on the top of the workpiece to achieve three-point positioning, which ensures the stability of the workpiece in all aspects during the polishing process and lays a solid foundation for subsequent high-quality polishing. (2) Polishing parameter settings: The angle of the rotary motor plate is adjusted by lifting cylinder to make the polishing wheel contact the inner wall of the workpiece, ensuring that the polishing force is uniform and moderate. The speed of the motor reducer is set to 8-15 rpm to ensure that the workpiece rotation speed is stable and meets the polishing process requirements. The reciprocating drive motor assembly moves at a speed of 50-200 mm / min to make the reciprocating speed of the polishing wheel in the axial direction reasonable and achieve uniform polishing. Set the axial feed of the polishing wheel to 0.5-2mm / time to accurately control the depth of polishing each time and avoid over-polishing or under-polishing. (3) Automated polishing: Start the drive shaft motor and reducer to drive the workpiece to rotate; Simultaneously start the polishing wheel motor and the reciprocating drive motor assembly; The polishing wheel rotates in the opposite direction to the workpiece, and under the combined action of rotational friction and axial reciprocating motion, it performs spiral trajectory polishing on the inner hole wall. This unique motion mode can polish the inner hole wall in all directions without dead angles, ensuring that every surface is polished evenly. The polishing wheel is controlled by a limit switch to reciprocate within the effective length of the workpiece. At the same time, the motor current value is monitored in real time. When the current suddenly increases beyond the set threshold (generally 1.5-2 times the normal value), the equipment is stopped and the wear condition of the polishing wheel is checked. At this time, the operator must check the wear condition of the polishing wheel in time. If the polishing wheel is found to be severely worn, a new polishing wheel should be replaced in time to avoid the decline in polishing quality or equipment failure caused by polishing wheel wear, and to ensure the smooth progress of the polishing process. (4) Quality inspection: After polishing, the surface roughness of the inner hole is tested using a roughness tester. Specifically, at least three measurement points are evenly selected on the inner hole wall of the workpiece using a roughness tester, and the surface roughness is measured at each point. The average roughness value Ra of all measurement points is then calculated. When Ra value > 0.8 μm, it indicates that the current polishing effect does not meet the requirements, and step (3) is repeated for secondary polishing; When Ra value ≤ 0.8μm, it indicates that the surface roughness of the inner hole of the workpiece has met the expected requirements. At this time, the clamping device and roller frame assembly can be loosened and the workpiece can be removed.

[0028] To further improve the polishing effect, an elastic buffer sleeve can be added to the polishing shaft. The polishing wheel is installed on the elastic buffer sleeve. In step (2), the position of the horizontal adjustment plate is finely adjusted by adjusting the screw so that the initial position of the polishing wheel is offset from the workpiece axis by 1-3mm, forming an eccentric polishing trajectory. This eccentric design enables the polishing wheel to generate friction forces in different directions on the inner hole wall during rotation, effectively improving the uniformity of polishing and further reducing the roughness of the inner hole wall.

[0029] In addition, a pressure sensor can be installed at the junction of the lifting cylinder and the rotary motor plate to measure the contact pressure between the polishing wheel and the inner wall of the workpiece. Based on the pressure, the contact pressure between the polishing wheel and the inner wall of the workpiece can be adjusted by the lifting cylinder. In the initial polishing stage, a larger contact pressure is used to quickly remove burrs and oxide layers from the workpiece surface, improving polishing efficiency. In the intermediate polishing stage, the contact pressure is gradually reduced to perform fine polishing on the workpiece surface, further improving surface quality. In the final polishing stage, a smaller contact pressure is used for finishing to achieve the required surface roughness and a smooth, mirror-like polishing effect.

[0030] In summary, this polishing device, through the coordinated operation of its components, achieves automated and efficient polishing of the inner hole of the seamless steel pipe in the combustion chamber of the hot air blower. It has the advantages of convenient operation, strong adaptability, and good polishing effect, which can effectively improve production efficiency and product quality, and reduce production costs.

Claims

1. A device for polishing boreholes inside a combustion chamber of a hot air blower, characterized in that: The system includes a platform on which a roller frame assembly and a clamping device are mounted to clamp and fix the workpiece. A polishing wheel assembly for polishing the workpiece is mounted on the platform on the lateral side of the roller frame assembly. The polishing wheel assembly is mounted on the platform via a reciprocating drive motor assembly. The polishing wheel assembly includes a horizontal adjustment plate, a rotary motor plate and a lifting cylinder for driving the rotary motor plate to rotate are hinged on the horizontal adjustment plate, a polishing shaft is mounted on the rotary motor plate through a bearing seat, a polishing wheel is mounted on the polishing shaft, and a motor for driving the polishing shaft to drive the polishing wheel to polish the workpiece is also mounted on the rotary motor plate. The motor is connected to the polishing shaft through a pulley and a belt. In use, the roller frame assembly and clamping device clamp and fix the workpiece, the reciprocating drive motor assembly drives the polishing wheel assembly to move laterally to the inner hole of the workpiece, the lifting cylinder drives the rotary motor plate to rotate, so that the polishing wheel contacts the inner hole of the workpiece, and the motor drives the polishing shaft and polishing wheel to rotate through the pulley and belt, so as to perform spiral polishing on the inner hole of the combustion chamber of the hot air blower. The spiral trajectory is achieved by the rotation direction of the polishing wheel being opposite to the lateral movement direction of the reciprocating drive motor assembly.

2. The hot air blower combustion chamber bore polishing device according to claim 1, characterized in that: The roller frame assembly includes a horizontally arranged fixed base, on which a drive shaft and a motor reducer for driving the drive shaft to rotate are mounted. The drive shaft is mounted on the fixed base via a bearing housing, and several drive wheels are mounted on the drive shaft. An adjusting base is mounted on a platform on one longitudinal side of the fixed base. The adjusting base is mounted on the platform via a longitudinally arranged slide rail and an adjusting screw. A driven shaft is mounted on the adjusting base, and several driven wheels for cooperating with the drive wheels to support the workpiece are mounted on the driven shaft. A limiting seat for cooperating with the adjusting seat is also installed on the platform on the longitudinal side of the adjusting seat.

3. The hot air blower combustion chamber bore polishing device according to claim 1 or 2, characterized in that: The clamping device includes a vertically arranged fixed frame, a linear guide that cooperates with the fixed frame is installed on the platform, the linear guide is arranged horizontally, a cylinder is installed on the top of the fixed frame through a cylinder fixing plate, and a pressure roller assembly for pressing and fixing the workpiece is installed on the piston rod end of the cylinder.

4. The hot air blower combustion chamber bore polishing device according to claim 1, characterized in that: The lateral adjustment plate is mounted on the reciprocating drive motor assembly via a longitudinally arranged guide rail slider structure. The guide rail of the guide rail slider structure is mounted on the reciprocating drive motor assembly, and the slider of the guide rail slider structure is mounted on the lateral adjustment plate. An adjustment screw for fine-tuning the lateral position of the lateral adjustment plate is also installed on the guide rail of the guide rail slider structure.

5. The hot air blower combustion chamber bore polishing device according to claim 1 or 4, characterized in that: The reciprocating drive motor assembly includes a linear guide rail mounted laterally on the platform, a motor reducer mounted on the linear guide rail via a motor mounting plate, a gear mounted on the motor shaft of the motor reducer, a rack mounted on the linear guide rail for cooperating with the gear, and a polishing wheel assembly mounted on the motor mounting plate. Limit switches are also installed on both sides of the linear guide rail to cooperate with the motor mounting plate.

6. The hot air blower combustion chamber bore polishing device according to claim 1, characterized in that: The device adopts a symmetrical layout design of dual polishing wheel assemblies, that is, two sets of polishing wheel assemblies are set and installed on both sides of the roller frame assembly respectively. One set of polishing wheel assemblies starts polishing from the left end of the inner hole of the workpiece, and the other set of polishing wheel assemblies cuts into the middle of the inner hole of the workpiece. The two sets of polishing wheel assemblies move to the right synchronously and each completes half of the spiral trajectory polishing of the inner hole.

7. The hot air blower combustion chamber bore polishing device according to claim 1, characterized in that: An infrared temperature sensor and a coolant nozzle are installed on the platform at the roller frame assembly. The infrared temperature sensor monitors the temperature of the polishing area in real time, and the spray flow rate and angle of the coolant sprayed by the coolant nozzle are adjusted according to the monitoring results so that the coolant covers the contact area between the inner hole of the workpiece and the polishing wheel, thereby cooling the surface of the workpiece.

8. A method for polishing the bore in the combustion chamber of a hot air blower, characterized in that: This method uses the hot air blower combustion chamber bore polishing apparatus according to any one of claims 1-7, and its steps are as follows: (1) Workpiece clamping: The combustion chamber workpiece is placed between the driving wheel and the driven wheel of the roller frame assembly; Adjusting the adjusting screw causes the adjusting seat to move longitudinally, so that the driven wheel and the driving wheel cooperate to clamp the workpiece; Start the clamping device, and the cylinder drives the pressure roller assembly to press down on the top of the workpiece to achieve three-point positioning; (2) Polishing parameter settings: The angle of the rotary motor plate is adjusted by the lifting cylinder to make the polishing wheel contact the inner wall of the workpiece. The speed of the motor reducer is set to 8-15 rpm, and the moving speed of the reciprocating drive motor assembly is set to 50-200 mm / min; Set the axial feed rate of the polishing wheel to 0.5-2 mm / pass; (3) Automated polishing: Start the drive shaft motor and reducer to drive the workpiece to rotate; Simultaneously start the polishing wheel motor and the reciprocating drive motor assembly; The polishing wheel rotates in the opposite direction to the workpiece, and under the combined action of rotational friction and axial reciprocating motion, it polishes the inner hole wall in a spiral trajectory. The polishing wheel is controlled to reciprocate within the effective length range of the workpiece by a limit switch. At the same time, the motor current value is monitored in real time. When the current suddenly increases and exceeds the set threshold, the equipment is paused and the wear condition of the polishing wheel is checked. (4) Quality inspection: After polishing, the surface roughness of the inner hole is tested using a roughness tester. Specifically, at least three measurement points are evenly selected on the inner hole wall of the workpiece using a roughness tester, and the surface roughness is measured at each point. The average roughness value Ra of all measurement points is then calculated. When Ra value > 0.8 μm, repeat step (3) for secondary polishing; When Ra value ≤ 0.8 μm, loosen the clamping device and roller frame assembly to remove the workpiece.

9. The method for polishing the combustion chamber bore of a hot air blower according to claim 8, characterized in that: An elastic buffer sleeve is added to the polishing shaft, and the polishing wheel is installed on the elastic buffer sleeve. In step (2), the position of the transverse adjustment plate is finely adjusted by adjusting the screw so that the initial position of the polishing wheel is offset from the workpiece axis by 1-3mm, forming an eccentric polishing trajectory.

10. The method for polishing the bore in the combustion chamber of a hot air blower according to claim 8, characterized in that: A pressure sensor is installed at the junction of the lifting cylinder and the rotary motor plate to measure the contact pressure between the polishing wheel and the inner wall of the workpiece. The contact pressure between the polishing wheel and the inner wall of the workpiece is adjusted by the lifting cylinder according to the pressure. In the initial polishing stage, a larger contact pressure is used to quickly remove burrs and oxide layers from the workpiece surface. In the intermediate polishing stage, the contact pressure is gradually reduced to perform fine polishing on the workpiece surface. In the final polishing stage, a smaller contact pressure is used for finishing to make the workpiece surface meet the required roughness requirements.

Images