Automatic polishing device for heating and ventilation hard pipeline

Abstract

The utility model discloses an automatic polishing device for a heating and ventilation hard pipeline. The automatic polishing device comprises a feeding table, a feeding assembly, a polishing table, a polishing machine, a polishing auxiliary assembly, a discharging table and a polishing and discharging assembly. The feeding table, the polishing table and the discharging table are sequentially connected, the feeding assembly is arranged on the feeding table, and the heating and ventilation hard pipeline is movably arranged on the feeding table through the feeding assembly. The polishing machine and the polishing auxiliary assembly are arranged on the polishing table, and the heating and ventilation hard pipeline can be movably arranged on the polishing table through the polishing auxiliary assembly and makes friction contact with a polishing wheel of the polishing machine. The polishing and discharging assembly is arranged on the discharging table, and the heating and ventilation hard pipeline is movably arranged on the discharging table through the polishing and discharging assembly. The feeding assembly, the polishing machine, the polishing auxiliary assembly and the polishing discharging assembly are arranged in the moving direction of the heating and ventilation hard pipeline. The utility model relates to the technical field of pipeline machining equipment, and can solve the problem that in the prior art, an automatic polishing device only polishes the outer wall of a heating and ventilation pipeline, so that the loading and unloading workload of constructors is large.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline processing equipment, in particular to an automatic polishing device for HVAC hard pipelines. Background Art

[0002] HVAC pipes are mainly steam and water pipes, and their function is to change the living environment. HVAC pipes include purification system return air ducts, central air conditioning ventilation ducts, industrial supply and exhaust ventilation ducts, environmental protection system suction and exhaust ducts, mining gas extraction pipes, mining rubberized cloth air ducts, etc., and have a very wide range of applications.

[0003] During the production process of HVAC pipes, it is usually necessary to polish them. Chinese utility model patent CN215700738U discloses a polishing device for HVAC hard pipes, including a metal fixing seat, on which an electric push rod, a bearing, a fixing plate and a drive motor are arranged. The electric push rod is fixedly connected to the left and right sides of the metal fixing seat, the bearing is fixedly connected to the middle and lower part of the metal fixing seat, the fixing plate is fixedly connected to the inner surface of the metal fixing seat and is located below the bearing, and the drive motor is fixedly connected to the right end of the metal fixing seat and is located below the electric push rod.

[0004] The polishing equipment can only polish the outer wall of the HVAC pipe, but not the inner wall; at the same time, the loading and unloading of the polishing equipment requires human assistance, which results in a large workload for the construction personnel and low work efficiency. Therefore, it is necessary to provide an automatic polishing device for HVAC hard pipes, which can solve the problem that the automatic polishing device in the prior art can only polish the outer wall of the HVAC pipe and the large workload for the construction personnel in loading and unloading. Summary of the invention

[0005] The utility model aims to provide an automatic polishing device for HVAC hard pipes, which can solve the problems in the prior art that the automatic polishing device can only polish the outer wall of the HVAC pipe and the construction workers have a large workload of loading and unloading materials.

[0006] The utility model is achieved in this way:

[0007] An automatic polishing device for HVAC hard pipes comprises a loading platform, a feeding assembly, a polishing platform, a polishing machine, a polishing auxiliary assembly, a loading platform and a polishing unloading assembly; the loading platform, the polishing platform and the unloading platform are connected in sequence to form a straight-line combined processing platform; the feeding assembly is arranged on the loading platform, so that the HVAC hard pipe can be movably arranged on the loading platform through the feeding assembly; the polishing machine and the polishing auxiliary assembly are arranged on the polishing platform, so that the HVAC hard pipe can be movably arranged on the polishing platform through the polishing auxiliary assembly and frictionally contact with the polishing wheel of the polishing machine; the polishing unloading assembly is arranged on the unloading platform, so that the HVAC hard pipe can be movably arranged on the unloading platform through the polishing unloading assembly; the feeding assembly, the polishing machine, the polishing auxiliary assembly and the polishing unloading assembly are arranged along the movement direction of the HVAC hard pipe.

[0008] The feeding assembly includes a first cylinder, which is arranged on one end of the loading platform away from the polishing platform; the piston rod of the first cylinder can coaxially abut against one end surface of the HVAC hard pipe, so that the HVAC hard pipe can be movably arranged on the loading platform through the piston rod.

[0009] A V-shaped material guide groove is formed on the top of the loading platform, and the piston rod of the first cylinder is located at the bottom of one end of the V-shaped material guide groove. A feeding hole for a heating and ventilation hard pipe to pass through is formed on the end where the loading platform is connected to the polishing platform, and the feeding hole is located at the bottom of the other end of the V-shaped material guide groove.

[0010] A plurality of guide ridges are formed at intervals in the V-shaped guide groove, and the plurality of guide ridges are arranged perpendicular to the axial direction and movement direction of the HVAC hard pipe. The guide ridges are located on the feeding side of the V-shaped guide groove and extend from the top to the bottom of the V-shaped guide groove.

[0011] The polishing auxiliary components are provided with two groups, and the two groups of polishing auxiliary components are arranged along the movement direction of the HVAC hard pipe and symmetrically arranged about the polishing machine; the polishing machine includes a pair of symmetrically arranged polishing machine units, and the pair of polishing machine units are symmetrically arranged on both sides of the movement path of the HVAC hard pipe, so that the polishing wheels of a pair of polishing machine units are in rolling friction contact with the outer wall of the HVAC hard pipe.

[0012] Each group of polishing auxiliary components includes a conveying frame, a driving wheel and a first motor. The conveying frame is a door-type structure and is arranged on the polishing table. The driving wheel is rotatably arranged in the conveying frame and is located outside the feeding hole of the loading table. The driving wheel is coaxially fixedly connected to the output shaft of the first motor. The first motor is installed on the conveying frame. A recessed portion is formed in the middle part of the driving wheel along the circumference of the driving wheel, so that the lower part of the HVAC hard pipe is placed on the recessed portion and can be moved through a pair of polishing machine units.

[0013] A pressure wheel is rotatably provided in the conveying frame, and the wheel axle of the pressure wheel is raised and lowered above the driving wheel through a hand wheel; a recessed portion is formed in the middle of the pressure wheel along the circumference of the pressure wheel, so that the pressure wheel rolls and presses against the upper part of the HVAC hard pipe through the recessed portion, and the HVAC hard pipe is horizontally arranged between the driving wheel and the pressure wheel of a pair of polishing auxiliary components.

[0014] The polishing auxiliary component also includes a support frame, which is arranged on the polishing table and located between the driving wheel and the polishing wheel; the top of the support frame is rotatably supported on both sides of the bottom of the HVAC hard pipe through a pair of steering rollers, and the axial direction of the steering roller is parallel to the axial direction of the HVAC hard pipe.

[0015] The polishing unloading assembly includes a second cylinder, a second motor and a polishing roller; the second cylinder is arranged on the unloading table, the piston rod of the second cylinder of the second motor, the output shaft of the second motor is arranged facing the polishing table and is coaxially fixed with the polishing roller; the polishing roller can be inserted into the HVAC hard pipe and have rolling friction contact with the inner wall of the HVAC hard pipe.

[0016] A material discharging inclined surface is formed on the top surface of the material discharging platform.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] 1. The utility model is provided with a feeding assembly, a polishing machine, a polishing auxiliary assembly and a polishing blanking assembly which are sequentially arranged along the moving direction of the HVAC hard pipe. The HVAC hard pipe is pushed and loaded by the feeding assembly, and the polishing auxiliary assembly continues to push the HVAC hard pipe to move and drive the HVAC hard pipe to rotate around its central axis. While moving and rotating, the outer wall of the HVAC hard pipe is polished by the polishing machine, and the inner wall of the HVAC hard pipe is polished by the polishing blanking assembly before blanking, so that the inner and outer walls of the HVAC hard pipe can be polished synchronously.

[0019] 2. The utility model is provided with a V-shaped material guide trough and a material discharge inclined surface. When loading materials, the construction personnel only need to hoist the HVAC hard pipe onto the V-shaped material guide trough, and the HVAC hard pipe can be rolled into place along the inclined surface of the V-shaped material guide trough. When unloading materials, the construction personnel only need to separate the HVAC hard pipe from the polishing roller, and the HVAC hard pipe can be rolled along the material discharge inclined surface. The loading and unloading workload of the construction personnel is small, which is conducive to improving the polishing processing efficiency of the HVAC hard pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional diagram of the automatic polishing device for HVAC hard pipes of the utility model;

[0021] Figure 2 This is a front view of the automatic polishing device for HVAC hard pipes of the utility model;

[0022] Figure 3 It is a stereoscopic diagram of a polishing table, a polishing machine and a polishing auxiliary component in an automatic polishing device for HVAC hard pipes of the utility model.

[0023] In the figure, 1-loading platform; 11-first cylinder; 12-feeding hole; 13-V-shaped guide groove, 14-guide convex strip; 2-polishing platform; 21-polishing machine; 22-conveying frame; 23-driving wheel; 24-first motor; 25-pressure wheel; 26-hand wheel; 27-support frame; 28-recessed part; 29-steering roller; 3-unloading platform; 31-second cylinder; 32-second motor; 33-polishing roller; 34-unloading inclined surface. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] Please see attached Figure 1 and attached Figure 2 , an automatic polishing device for HVAC hard pipes, comprising a loading platform 1, a feeding assembly, a polishing platform 2, a polishing machine 21, a polishing auxiliary assembly, a loading platform 3 and a polishing unloading assembly; the loading platform 1, the polishing platform 2 and the unloading platform 3 are connected in sequence to form a straight-line combined processing platform; the feeding assembly is arranged on the loading platform 1, so that the HVAC hard pipe can be movably arranged on the loading platform 1 through the feeding assembly; the polishing machine 21 and the polishing auxiliary assembly are arranged on the polishing platform 2, so that the HVAC hard pipe can be movably arranged on the polishing platform 2 through the polishing auxiliary assembly and frictionally contact with the polishing wheel of the polishing machine 21; the polishing unloading assembly is arranged on the unloading platform 3, so that the HVAC hard pipe can be movably arranged on the unloading platform 3 through the polishing unloading assembly; the feeding assembly, the polishing machine 21, the polishing auxiliary assembly and the polishing unloading assembly are arranged along the movement direction of the HVAC hard pipe.

[0026] The construction workers only need to hoist the HVAC hard pipe onto the loading platform 1, and push the HVAC hard pipe along the loading platform 1 to the polishing platform 2 through the feeding assembly; then continue to push the HVAC hard pipe along the polishing platform 2 to the unloading platform 3 through the polishing auxiliary assembly, and polish the outer wall of the HVAC hard pipe through the polishing machine 21 during the movement; finally, polish the inner wall of the HVAC hard pipe through the polishing unloading assembly, and unload it after polishing.

[0027] The automatic polishing device of the utility model can polish the inner wall and the outer wall of the HVAC hard pipe, and the loading and unloading operation workload of the construction personnel is low.

[0028] Please see attached Figure 1 and attached Figure 2The feeding assembly includes a first cylinder 11, which is arranged on an end of the loading platform 1 away from the polishing platform 2; the piston rod of the first cylinder 11 can coaxially abut against one end face of the HVAC hard pipe, so that the HVAC hard pipe can be movably arranged on the loading platform 1 through the piston rod.

[0029] The size of the first cylinder 11 and the movement range of its piston rod can be selected according to the length of the HVAC hard pipe. When the piston rod of the first cylinder 11 is extended, the HVAC hard pipe can be pushed toward the polishing table 2, i.e., along the movement direction of the HVAC hard pipe, thereby automatically completing the loading operation, eliminating the need for manual loading by construction personnel, and reducing manual workload.

[0030] Please see attached Figure 1 A V-shaped material guide groove 13 is formed on the top of the loading platform 1, and the piston rod of the first cylinder 11 is located at the bottom of one end of the V-shaped material guide groove 13. A feeding hole 12 for a heating and ventilation hard pipe to pass through is formed on the end where the loading platform 1 is connected to the polishing platform 2, and the feeding hole 12 is located at the bottom of the other end of the V-shaped material guide groove 13.

[0031] The V-shaped guide groove 13 of the V-shaped structure can provide guidance for the HVAC hard pipe through its inclined surface, so that it rolls to the lowest point of the V-shaped guide groove 13, that is, between the piston rod of the first cylinder 11 and the feeding hole 12, so as to facilitate pushing the HVAC hard pipe onto the polishing table 2.

[0032] The diameter of the feeding hole 12 is slightly larger than the outer diameter of the HVAC hard pipe, so as to facilitate the penetration movement of the HVAC hard pipe and also facilitate the precise control of the movement trajectory of the HVAC hard pipe.

[0033] Please see attached Figure 1 A plurality of guide ridges 14 are formed at intervals in the V-shaped guide groove 13. The plurality of guide ridges 14 are arranged perpendicular to the axial direction and movement direction of the HVAC hard pipe. The guide ridges 14 are located on the feeding side of the V-shaped guide groove 13 and extend from the top to the bottom of the V-shaped guide groove 13.

[0034] Preferably, the surface of the guide ridge 14 can be formed in a step shape, and the guide ridge 14 facilitates the sliding of the HVAC hard pipe in the V-shaped guide groove 13.

[0035] Please see attached Figure 3 The polishing auxiliary components are provided with two groups, and the two groups of polishing auxiliary components are arranged along the movement direction of the HVAC hard pipe and are symmetrically arranged about the polishing machine 21; the polishing machine 21 includes a pair of symmetrically arranged polishing machine units, and the pair of polishing machine units are symmetrically arranged on both sides of the movement path of the HVAC hard pipe, so that the polishing wheels of a pair of polishing machine units are in rolling friction contact with the outer wall of the HVAC hard pipe.

[0036] A pair of polishing machine units are symmetrically arranged on both sides of the HVAC hard pipe movement path, which can polish the outer wall of the HVAC hard pipe from both sides to improve the polishing efficiency. The polishing auxiliary components are arranged at intervals on the movement path of the HVAC hard pipe, which can more stably support and push the HVAC hard pipe to move along its movement direction, ensuring that the movement trajectory of the HVAC hard pipe is its horizontal axis.

[0037] Please see attached Figure 3 Each group of the polishing auxiliary components includes a conveying frame 22, a driving wheel 23 and a first motor 24. The conveying frame 22 is a door-type structure and is arranged on the polishing table 2. The driving wheel 23 is rotatably arranged in the conveying frame 22 through a wheel axle and is located outside the feeding hole 12 of the loading table 1; the wheel axle of the driving wheel 23 is coaxially fixedly connected with the output shaft of the first motor 24, and the first motor 24 is installed on the conveying frame 22. A recessed portion 28 is formed in the middle part of the driving wheel 23 along the circumference of the driving wheel 23, so that the lower part of the HVAC hard pipe is placed on the recessed portion 28 and can be movably passed through a pair of polishing machine units.

[0038] Preferably, the driving wheel 23 can adopt a wheel group structure, so as to drive and push the HVAC hard pipe more stably, smoothly and efficiently, and use the recessed portion 28 to increase the contact area with the HVAC hard pipe and the limiting effect on the HVAC hard pipe to avoid slipping and the like.

[0039] The first motor 24 can be a unidirectional transmission motor of the prior art, which is used to drive the driving wheel 23 to rotate. Conventional transmission structures such as gears and synchronous belt groups can be used between the wheel group of the driving wheel 23 and the output shaft of the first motor 24 to achieve synchronous transmission, which will not be repeated here.

[0040] Please see attached Figure 3 A pressing wheel 25 is rotatably provided in the conveying frame 22 through an axle, and the axle of the pressing wheel 25 is lifted and lowered above the driving wheel 23 through a hand wheel 26 via a screw; a recessed portion 28 is formed in the middle of the pressing wheel 25 along the circumference of the pressing wheel 25, so that the pressing wheel 25 rolls and presses against the upper part of the HVAC hard pipe through the recessed portion 28, and the HVAC hard pipe is horizontally arranged between the driving wheel 23 and the pressing wheel 25 of a pair of polishing auxiliary components.

[0041] The pressure wheel 25 can adopt the same wheel set as the driving wheel 23, and is arranged directly above the driving wheel 23, and is used to provide an upward limit for the HVAC hard pipe to prevent the HVAC hard pipe from jumping.

[0042] Preferably, the bottom of the handwheel 26 is coaxially connected to a screw rod, which is threadedly connected to a screw hole on the top plate of the conveying frame 22, and the lower end of the screw rod is connected to the axle of the pressure wheel 25, so that the pressure wheel 25 is driven up and down by the rotation of the handwheel 26 through the threaded transmission to adapt to HVAC hard pipes of different sizes, ensuring that the space formed between the recessed portion 28 of the pressure wheel 25 and the recessed portion 28 of the driving wheel 23 matches the outer diameter of the HVAC hard pipe, ensuring the linearity of the movement trajectory of the HVAC hard pipe and will not deviate.

[0043] Preferably, vertical lifting grooves can be provided on both side plates of the conveying frame 22, and both ends of the wheel axle of the pressing wheel 25 respectively pass through the vertical lifting grooves on both sides, so as to improve the lifting stability and linearity of the pressing wheel 25.

[0044] Please see attached Figure 3 The polishing auxiliary component also includes a support frame 27, which is arranged on the polishing table 2 and located between the driving wheel 23 and the polishing wheel; the top of the support frame 27 is rotatably supported on both sides of the bottom of the HVAC hard pipe through a pair of steering rollers 29 via a roller shaft motor (not shown in the figure), and the axial direction of the steering roller 29 is parallel to the axial direction of the HVAC hard pipe.

[0045] The roller shaft motor can be a small motor, which is used to drive the steering roller 29 to rotate. The axial direction of the steering roller 29 is parallel to the axial direction of the HVAC hard pipe, so that when the steering roller 29 rotates, it can drive the HVAC hard pipe to rotate with its central axis as the axis, and then the polishing wheel can polish the outer wall of the HVAC hard pipe at different positions. The rotation coordination of the steering roller 29 and the driving wheel 23 ensures that the HVAC hard pipe rotates and moves axially at the same time, ensuring that the entire outer wall of the HVAC hard pipe can be evenly polished.

[0046] Please see attached Figure 1 The polishing and unloading assembly includes a second cylinder 31, a second motor 32 and a polishing roller 33; the second cylinder 31 is arranged on the unloading table 3, the second motor 32 is on the piston rod of the second cylinder 31, the output shaft of the second motor 32 is arranged facing the polishing table and is coaxially fixed with the polishing roller 33; the polishing roller 33 can be inserted into the HVAC hard pipe and roll and frictionally contact with the inner wall of the HVAC hard pipe.

[0047] The second cylinder 31 is used to control the extension and retraction of the second motor 32 and the polishing roller 33 through the piston rod. During the polishing operation, the polishing roller 33 is extended to the vicinity of the polishing table 2, so that when the end of the HVAC hard pipe extends out of the polishing table 2, the polishing roller 33 can be inserted into the HVAC hard pipe and polish its inner wall. As the HVAC hard pipe rotates and moves, the second motor 32 drives the polishing roller 33 to rotate, thereby realizing synchronous polishing of the inner wall of the HVAC hard pipe.

[0048] The size of the polishing roller 33 can be selected according to the adaptability of the inner diameter of the HVAC hard pipe, and the second motor 32 can be a small motor, and its volume is preferably smaller than the inner diameter of the HVAC hard pipe to avoid interfering with the movement of the HVAC hard pipe. The setting position of the second cylinder 31 can be adjusted according to the length of the HVAC hard pipe, so that the HVAC hard pipe completely escapes from the second driving wheel 23 on the polishing table 2 and just hits the end face of the second cylinder 31 close to the polishing table 2. At this time, the polishing roller 33 completes the polishing of the inner wall of the HVAC hard pipe.

[0049] Please see attached Figure 1 A material discharging slope 34 is formed on the top surface of the material discharging platform 3 .

[0050] Preferably, the unloading slope 34 can be arranged obliquely downward toward the unloading side of the unloading platform 3, so as to facilitate the rolling unloading of the HVAC hard pipe along the unloading slope 34. The width of the unloading slope 34 is smaller than the width of the unloading platform 3, so that the unloading end of the unloading platform 3 forms a barrier at the bottom of the unloading slope 34, preventing the HVAC hard pipe from falling from the unloading platform 3 when rolling along the unloading slope 34.

[0051] Please see attached Figure 1 To Attachment Figure 3 The working process and working principle of the utility model for polishing HVAC hard pipes are as follows:

[0052] The HVAC hard pipe is placed on the loading platform 1, and the HVAC hard pipe slides along the guide ridge 14 to the lowest point of the V-shaped guide groove 13. The first cylinder 11 is started, and the piston rod of the first cylinder 11 extends and pushes the HVAC hard pipe toward the polishing platform 2, so that the HVAC hard pipe passes through the feeding hole 12 and moves onto the polishing platform 2.

[0053] The hand wheel 26 is turned to move the pressing wheel 25 downward until the space between the pressing wheel 25 and the recessed portion 28 of the driving wheel 23 matches the size of the HVAC hard pipe, and the horizontal axial movement of the HVAC hard pipe can be maintained by the pressing wheel 25 and the driving wheel 23. When the HVAC hard pipe is sent between the driving wheel 23 and the pressing wheel 25, the first motor 24 is started, and the first motor 24 drives the driving wheel 23 to rotate, and the HVAC hard pipe is pushed toward the polishing machine 21 by friction. While the HVAC hard pipe moves forward, the polishing wheels of a pair of polishing machine units rotate to polish the outer wall of the HVAC hard pipe.

[0054] The polishing process of the HVAC hard pipe is as follows: the polishing wheel rotates for a period of time, polishes an area on the outer wall of the HVAC hard pipe, the steering roller 29 rotates and uses friction to rotate the HVAC hard pipe around the central axis by a certain angle, the polishing wheel continues to rotate for a period of time, and the steering roller 29 drives the rotation of the HVAC hard pipe to ensure that the polishing wheel performs circumferential polishing on the outer wall of the HVAC hard pipe. After completing one round of polishing, the HVAC hard pipe is pushed forward a certain distance through the first motor 24 via the driving wheel 23, and the above operation is repeated to complete the next round of polishing. With the cooperation of the steering roller 29 and the driving wheel 23, the outer wall of the HVAC hard pipe is polished, and the HVAC hard pipe is pushed to the unloading table 3 at the same time.

[0055] The second cylinder 31 is started, and the piston rod of the second cylinder 31 extends, pushing the second motor 32 and the polishing roller 33 to the polishing table 2. When the end of the HVAC hard pipe moves to the unloading table 3, the polishing roller 33 is just inserted into the HVAC hard pipe and contacts the inner wall of the HVAC hard pipe. The second motor 32 is started, and the second motor 32 drives the polishing roller 33 to rotate, polishing the inner wall of the HVAC hard pipe. With the movement of the HVAC hard pipe, the entire inner wall of the HVAC hard pipe is polished.

[0056] When the HVAC hard pipe moves to abut against the end of the second cylinder 31 close to the polishing table 2, the inner and outer walls of the HVAC hard pipe are polished. The second motor 32 is turned off, and the piston rod of the second cylinder 31 drives the second motor 32 and the polishing roller 33 to retract. Since the HVAC hard pipe is pressed against the second cylinder 31 and does not move with the polishing roller 33, the polishing roller 33 can be withdrawn from the HVAC hard pipe.

[0057] When the polishing roller 33 moves to the end of the HVAC hard pipe, the construction personnel move the HVAC hard pipe to the end away from the polishing roller 33 to remove the HVAC hard pipe, and roll the HVAC hard pipe through the cutting slope 34.

[0058] The above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An automatic polishing device for HVAC hard pipes, characterized by: The invention comprises a loading platform (1), a feeding assembly, a polishing platform (2), a polishing machine (21), a polishing auxiliary assembly, a loading platform (3) and a polishing unloading assembly; the loading platform (1), the polishing platform (2) and the unloading platform (3) are connected in sequence to form a straight-line combined processing platform; the feeding assembly is arranged on the loading platform (1), so that the HVAC hard pipe can be movably arranged on the loading platform (1) through the feeding assembly; the polishing machine (21) and the polishing auxiliary assembly are arranged on the polishing platform (2), so that the HVAC hard pipe can be movably arranged on the polishing platform (2) through the polishing auxiliary assembly and frictionally contact with the polishing wheel of the polishing machine (21); the polishing unloading assembly is arranged on the unloading platform (3), so that the HVAC hard pipe can be movably arranged on the unloading platform (3) through the polishing unloading assembly; the feeding assembly, the polishing machine (21), the polishing auxiliary assembly and the polishing unloading assembly are arranged along the moving direction of the HVAC hard pipe.

2. The automatic polishing device for HVAC hard pipes according to claim 1 is characterized in that: The feeding assembly comprises a first cylinder (11), which is arranged on an end of the loading platform (1) away from the polishing platform (2); the piston rod of the first cylinder (11) can coaxially abut against an end surface of a HVAC hard pipe, so that the HVAC hard pipe can be movably arranged on the loading platform (1) through the piston rod.

3. The automatic polishing device for HVAC hard pipes according to claim 2 is characterized in that: A V-shaped material guide groove (13) is formed on the top of the loading platform (1), and the piston rod of the first cylinder (11) is located at the bottom of one end of the V-shaped material guide groove (13). A feeding hole (12) through which a heating and ventilation hard pipe passes is formed on the end of the loading platform (1) connected to the polishing platform (2), and the feeding hole (12) is located at the bottom of the other end of the V-shaped material guide groove (13).

4. The automatic polishing device for HVAC hard pipes according to claim 3 is characterized by: A plurality of guide ridges (14) are formed at intervals in the V-shaped guide groove (13), and the plurality of guide ridges (14) are arranged perpendicular to the axial direction and the movement direction of the HVAC hard pipe. The guide ridges (14) are located on the feeding side of the V-shaped guide groove (13) and extend from the top to the bottom of the V-shaped guide groove (13).

5. The automatic polishing device for HVAC hard pipes according to claim 1 is characterized in that: The polishing auxiliary components are provided with two groups, and the two groups of polishing auxiliary components are arranged along the movement direction of the HVAC hard pipe and are symmetrically arranged with respect to the polishing machine (21); the polishing machine (21) comprises a pair of symmetrically arranged polishing machine units, and the pair of polishing machine units are symmetrically arranged on both sides of the movement path of the HVAC hard pipe, so that the polishing wheels of the pair of polishing machine units are in rolling friction contact with the outer wall of the HVAC hard pipe.

6. The automatic polishing device for HVAC hard pipes according to claim 5 is characterized in that: Each group of the polishing auxiliary components comprises a conveying frame (22), a driving wheel (23) and a first motor (24); the conveying frame (22) is a door-shaped structure and is arranged on the polishing table (2); the driving wheel (23) is rotatably arranged in the conveying frame (22) and is located outside the feeding hole (12) of the loading table (1); the driving wheel (23) is coaxially fixedly connected with the output shaft of the first motor (24); the first motor (24) is installed on the conveying frame (22); a recessed portion (28) is formed in the middle of the driving wheel (23) along the circumference of the driving wheel (23), so that the lower part of the HVAC hard pipe is placed on the recessed portion (28) and can be moved through a pair of polishing machine units.

7. The automatic polishing device for HVAC hard pipes according to claim 6 is characterized by: A pressure wheel (25) is rotatably provided in the conveying frame (22), and the axle of the pressure wheel (25) is arranged above the driving wheel (23) in a liftable manner through a hand wheel (26); a recessed portion (28) is formed in the middle of the pressure wheel (25) along the circumference of the pressure wheel (25), so that the pressure wheel (25) can roll and press against the upper part of the HVAC hard pipe through the recessed portion (28), and the HVAC hard pipe is horizontally arranged between the driving wheel (23) and the pressure wheel (25) of a pair of polishing auxiliary components.

8. The automatic polishing device for HVAC hard pipes according to claim 7 is characterized in that: The polishing auxiliary component also includes a support frame (27), which is arranged on the polishing table (2) and is located between the driving wheel (23) and the polishing wheel; the top of the support frame (27) is rotatably supported on both sides of the bottom of the HVAC hard pipe through a pair of steering rollers (29), and the axial direction of the steering roller (29) is parallel to the axial direction of the HVAC hard pipe.

9. The automatic polishing device for HVAC hard pipes according to claim 1 is characterized by: The polishing unloading assembly comprises a second cylinder (31), a second motor (32) and a polishing roller (33); the second cylinder (31) is arranged on the unloading platform (3), the second motor (32) is on the piston rod of the second cylinder (31), the output shaft of the second motor (32) is arranged facing the polishing platform and is coaxially fixedly connected to the polishing roller (33); the polishing roller (33) can be inserted into the HVAC hard pipe and has rolling friction contact with the inner wall of the HVAC hard pipe.

10. The automatic polishing device for HVAC hard pipes according to claim 1 or 9, characterized in that: A material discharging inclined surface (34) is formed on the top surface of the material discharging platform (3).

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