Internal polishing machine and pipe fitting machined by internal polishing machine

Abstract

The utility model discloses an internal polisher and a pipe fitting processed by the internal polisher, the internal polisher comprises a bearing assembly provided with a bearing part, and the bearing part is provided with a bearing space for bearing the pipe fitting; the driving frame is provided with driving wheels capable of lifting up and down, the moving paths of the driving wheels intersect with the pipe fitting, and the driving wheels are driven by a driving device; the polishing assembly comprises a base, a power trolley and a long rod, the base is in butt joint with the bearing assembly, the power trolley is slidably connected to the base in the front-back direction, the power trolley is connected with the long rod, and the long rod and the pipe fitting are coaxial; an airflow channel is formed in the long rod, the long rod is connected with a positive pressure air pipe communicated with the airflow channel, a polishing unit and an air nozzle communicated with the airflow channel are arranged at the tail end of the long rod, and the air nozzle is closer to the bearing assembly relative to the polishing unit. According to the pipe fitting inner polishing device, liquid remaining in an inner hole of a pipe fitting can be blown away while the pipe fitting is internally polished, the drying procedure is omitted, and the production period of the pipe fitting is greatly shortened.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of metal processing, especially to an inner polishing machine and a pipe fitting processed thereby. BACKGROUND

[0002] In the related art, such as the pipe fitting inner wall polishing device with publication No. CN218696768U, it discloses a technical scheme of using multiple polishing heads to polish the inner hole of a steel pipe, which can effectively improve the inner polishing efficiency of the steel pipe.

[0003] Since the steel pipe is generally cut from a long pipe, emulsion needs to be continuously used to reduce the temperature of the cut during the cutting process to avoid oxidation of the steel pipe due to high temperature. Therefore, the inner and outer walls of each steel pipe are left with emulsion, especially for the inner wall of the steel pipe, which is difficult to be completely discharged. When the steel pipe is subjected to inner polishing, it is necessary to ensure that the inner wall of the steel pipe is free of liquid residue, otherwise, when the polishing head is used for inner polishing, the liquid may react with the metal of the inner wall of the steel pipe under the action of friction heat. This reaction not only causes corrosion and damage to the inner wall of the steel pipe, but also may produce flammable and explosive gases such as hydrogen, increasing the safety risk. In addition, the residue of the liquid will cover the surface of the inner wall of the steel pipe, hindering the direct contact between the polishing head and the metal surface, thereby affecting the polishing quality and efficiency.

[0004] Therefore, in the prior art, the steel pipe needs to be fully dried before inner polishing, which prolongs the production cycle of the steel pipe. SUMMARY

[0005] The utility model aims at providing an inner polishing machine which can perform inner polishing without waiting for the drying of the steel pipe.

[0006] The inner polishing machine according to the first aspect of the utility model comprises:

[0007] A supporting assembly is provided with a supporting portion having a supporting space arranged along the front-rear direction, and the supporting space is used for supporting the pipe fitting;

[0008] A driving frame is provided with a driving wheel that can be raised and lowered, the driving wheel is located above the supporting assembly, the moving path of the driving wheel intersects the pipe fitting, the driving wheel is driven by a driving device, and the driving wheel has a rotation axis arranged along the front-rear direction;

[0009] The polishing assembly comprises a base, a power trolley and a long rod, the base is located at the front side or the rear side of the supporting assembly, the power trolley is slidingly connected to the base in the front-rear direction, the power trolley is connected with the long rod, and the long rod is coaxial with the pipe; the long rod is internally provided with an airflow channel, the long rod is connected with a positive pressure air pipe which is communicated with the airflow channel, the end of the long rod is provided with a polishing unit and an air nozzle which is communicated with the airflow channel, and the air nozzle is closer to the supporting assembly than the polishing unit.

[0010] The inner polishing machine has at least the following beneficial effects: during processing, the pipe is first placed in the supporting space of the supporting assembly, then the driving wheel is controlled to press the pipe tightly and the power trolley is started, the driving wheel drives the pipe to rotate under the driving of the driving device, at the same time, the power trolley drives the long rod to enter the inner hole of the pipe, in this process, the positive pressure air pipe sprays high-pressure gas into the inner hole of the pipe through the air nozzle, so that the residual liquid in the pipe can flow in the moving direction of the long rod under the blowing of the high-pressure gas, thereby ensuring that the polishing unit and the inner hole of the pipe are dryly rubbed, and finally the residual liquid in the pipe is blown away from the pipe under the blowing of the high-pressure gas as the long rod gradually penetrates, at this time, the polishing unit also completes the preliminary polishing of the inner hole of the pipe; compared with the prior art, the utility model is suitable for processing relatively short pipes, the utility model can blow away the liquid remaining in the inner hole of the pipe while polishing the inner hole of the pipe, the drying process is saved, and the production cycle of the pipe is greatly shortened.

[0011] According to some embodiments of the utility model, the long rod is connected with a negative pressure air pipe which is communicated with the airflow channel, and the negative pressure air pipe and the positive pressure air pipe are not simultaneously communicated with the airflow channel. When the power trolley drives the long rod to reset, in this process, the polishing unit polishes the inner hole of the pipe for the second time, because there are polishing debris in the inner hole of the pipe, therefore, the negative pressure air pipe replaces the positive pressure air pipe to provide negative pressure suction for the airflow channel, so that the polishing debris can be sucked into the airflow channel by the air nozzle and discharged with the negative pressure air pipe, so as to save the cleaning process after polishing, thereby further shortening the production cycle of the pipe.

[0012] According to some embodiments of the utility model, specifically, the supporting part comprises a plurality of supporting assemblies, all the supporting assemblies are arranged at intervals in the front-rear direction, each supporting assembly is provided with two rotating rollers, the two rotating rollers are arranged at intervals in the left-right direction, the distance between the two rotating rollers is smaller than the diameter of the pipe, and all the rotating rollers jointly form the supporting space.

[0013] According to some embodiments of the utility model, the number of the supporting parts is multiple, all the supporting parts are arranged at intervals in the left-right direction, and the number of the long rods is consistent with the number of the supporting parts, so that the simultaneous processing of multiple pipes can be realized.

[0014] According to some embodiments of the present application, the number of driving wheels is consistent with the number of supporting assemblies, and the driving wheels are located directly above the supporting spaces, so that each pipe is rotated and driven by multiple driving wheels, thereby avoiding uneven rotation of the pipe due to insufficient driving force.

[0015] According to some embodiments of the present application, all the driving wheels form multiple driving assemblies, each of which is provided with multiple driving wheels arranged at intervals in the left-right direction, and all the driving wheels of each driving assembly are connected with a transmission pair. The transmission pair of each driving assembly is driven by a driving device, thereby saving manufacturing cost.

[0016] According to some embodiments of the present application, the driving frame is connected with multiple lifting devices, and each lifting device is connected with the driving assembly. Each driving assembly is driven by a lifting device, thereby saving manufacturing cost.

[0017] According to some embodiments of the present application, since the polishing unit is a consumable, the polishing unit is detachably connected to the long rod for easy replacement of the polishing unit.

[0018] According to some embodiments of the present application, the polishing assembly further comprises a driven trolley located between the power trolley and the supporting assembly, the driven trolley is slidingly connected to the base in the front-rear direction, the driven trolley is provided with a middle bracket for supporting the long rod, and the driven trolley and the power trolley are connected with a flexible traction unit. Since the length of the long rod is relatively long, the driven trolley is needed to support the long rod. With the travel of the power trolley, the power trolley drives the driven trolley to travel together after contacting the driven trolley. During the resetting process of the power trolley, when the power trolley is reset to a certain position, it pulls the driven trolley to reset together through the flexible traction unit, so as to ensure effective support of the long rod.

[0019] The pipe according to the second aspect of the present application is processed by the internal polishing machine.

[0020] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings.

[0022] Figure 1 is a schematic perspective view of an internal polishing machine according to an embodiment of the present application.

[0023] Figure 2 is Figure 1 a front view of the inner polishing machine shown in FIG. 1.

[0024] In the drawings: 100 - support assembly, 200 - driving frame, 300 - polishing assembly, 400 - pipe, 101 - support part, 110 - support component, 111 - rotating roller, 210 - lifting device, 220 - driving component, 230 - driving device, 221 - driving wheel, 310 - base, 320 - power trolley, 330 - driven trolley, 340 - fixed bracket, 350 - long rod, 321 - power source, 331 - intermediate bracket, 332 - flexible traction unit, 351 - polishing unit, 352 - positive pressure air pipe, 353 - air nozzle, 354 - negative pressure air pipe, 240 - transmission pair, 250 - mounting frame. DETAILED DESCRIPTION

[0025] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are used only for explaining the present application, and cannot be understood as a limitation of the present application.

[0026] In the description of the present application, it should be understood that, if the orientation description, such as the upper, lower, front, rear, left, right and the like, is described as the orientation or position relationship based on the drawings, it is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application.

[0027] In the description of the present application, the meaning of several is one or more, the meaning of multiple is at least two, greater than, less than, more than and the like are understood as not including the number, above, below, within and the like are understood as including the number. If it is described as first, second, it is only used for distinguishing the purpose of technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0028] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting and the like should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.

[0029] As Figure 1 and Figure 2As shown, the inner polishing machine according to the first aspect embodiment of the utility model, it includes support assembly 100, drive frame 200 and polishing assembly 300, wherein support assembly 100 is used to support the pipe 400 to be polished, in order to realize the positioning of pipe 400, support assembly 100 is equipped with support part 101, support part 101 includes a plurality of support components 110, all support components 110 are spaced apart along the front-back direction, each support component 110 is equipped with two rotating rollers 111, two rotating rollers 111 are spaced apart along the left-right direction, the spacing between two rotating rollers 111 is less than the diameter of pipe 400, all rotating rollers 111 jointly form the support space along the front-back direction. When pipe 400 is placed in the support space, pipe 400 is positioned and supported by the rotating roller 111 on the left and right sides, and since the rotating roller 111 can rotate freely, pipe 400 still has a rotational degree of freedom when being supported, at this time pipe 400 extends along the front-back direction.

[0030] On the other hand, drive frame 200 extends upward to the upper side of support assembly 100, drive frame 200 is equipped with lifting device 210 at the position corresponding to each support component 110, each lifting device 210 is connected with drive assembly 220, each drive assembly 220 is equipped with drive wheel 221 driven by drive device 230, drive wheel 221 is located directly above the support space, drive wheel 221 has a rotation axis along the front-back direction. In this embodiment, lifting device 210 can be selected as a pneumatic cylinder, drive device 230 can be selected as a motor, drive wheel 221 can be selected as a non-metal wear-resistant material component, and the movement path of drive wheel 221 intersects with pipe 400. When pipe 400 is positioned and supported on all support components 110, start lifting device 210 to drive drive wheel 221 to press down to pipe 400, at this time pipe 400 has a rotational degree of freedom in addition to all other degrees of freedom being limited, when drive device 230 drives drive wheel 221 to rotate, under the action of friction, pipe 400 rotates with drive wheel 221, thereby realizing the high-speed rotation of pipe 400. Since drive assembly 220 and support component 110 are located on the upper and lower sides of pipe 400 respectively, the forces in two directions will counteract each other, avoiding generating shear stress that can cause bending on pipe 400.

[0031] On the other hand, the polishing assembly 300 comprises a base 310, a power trolley 320, a driven trolley 330, a fixed bracket 340 and a long rod 350. The base 310 is located at the front side or the rear side of the supporting assembly 100. The power trolley 320 and the driven trolley 330 are both slidingly connected to the base 310 along the front-rear direction. The fixed bracket 340 is fixedly connected to the base 310. The power trolley 320 is driven by a power source 321. The driven trolley 330 is not powered. The power trolley 320, the driven trolley 330, the fixed bracket 340 and the supporting assembly 100 are sequentially arranged along the front-rear direction, i.e. the driven trolley 330 is located between the power trolley 320 and the fixed bracket 340. The fixed bracket 340 is closer to the supporting assembly 100 than the driven trolley 330. The power trolley 320 is connected with the long rod 350. The long rod 350 is coaxial with the pipe 400. The length of the long rod 350 is not shorter than the length of the pipe 400. Since the length of the pipe 400 is 3 meters, the length of the long rod 350 is not shorter than 3 meters, and can be 3.5 meters. When the power trolley 320 travels along the front-rear direction by the power source 321, in order to avoid the long rod 350 from being bent due to excessive deflection, and then failing to accurately enter the inner hole of the pipe 400, the driven trolley 330 is provided with a middle bracket 331 for supporting the long rod 350. The fixed bracket 340 is used for supporting the end of the long rod 350, so as to maintain the flatness of the long rod 350.

[0032] Since the driven trolley 330 is not powered, in order to control the position of the driven trolley 330, a flexible traction unit 332 is connected between the driven trolley 330 and the power trolley 320. The flexible traction unit 332 can be a chain, a cloth belt or other flexible materials. In use, as the power trolley 320 travels, the power trolley 320 gradually approaches the driven trolley 330. After the power trolley 320 contacts the driven trolley 330, the power trolley 320 drives the driven trolley 330 to travel together, until the driven trolley 330 abuts against the fixed bracket 340. The driven trolley 330 is provided with a travel switch (not shown in the drawings) on the side towards the fixed bracket 340. Once the travel switch is blocked by the fixed bracket 340, the power trolley 320 stops traveling immediately, so as to limit the maximum extension distance of the long rod 350. During the resetting process of the power trolley 320, when the power trolley 320 is reset to a certain position, it pulls the driven trolley 330 to reset together through the flexible traction unit 332, so as to ensure the effective support of the long rod 350.

[0033] In order to realize the inner polishing of the inner hole of the pipe fitting 400, the end of the long rod 350 is detachably connected with a polishing unit 351, which can be a grinding head. The grinding head can be used as existing material, has multiple flexible abrasive sheets, and is connected with the long rod 350 in a sleeving manner. The polishing head is sleeved in the recess at the end of the long rod 350, and the connection between the two has a key connection structure to limit the rotation freedom of the polishing head. Since the polishing head is a consumable, in order to facilitate the assembly and disassembly of the polishing head, the polishing head and the long rod 350 can be positioned and connected by a snap spring. When it is necessary to disassemble the polishing head, only the snap springs on the front and rear sides of the polishing head need to be removed. At this time, the front and rear positions of the polishing head are no longer limited by the snap springs, so that the polishing head can be smoothly taken out of the long rod 350.

[0034] In other embodiments, the polishing head and the long rod 350 can also have different detachable connection structures, which are not limited to the above embodiments.

[0035] In order to be able to polish the inner hole of the pipe fitting 400 without drying the pipe fitting 400, the long rod 350 is provided with an airflow channel. The first end of the long rod 350 is connected with a positive pressure air pipe 352 which is communicated with the airflow channel. The end of the long rod 350 is provided with an air nozzle 353 which is communicated with the airflow channel. The air nozzle 353 is closer to the supporting assembly 100 than the polishing unit 351.

[0036] With the above structure, during processing, first, the pipe fitting 400 is placed in the supporting space of the supporting assembly 100. Then the lifting device 210 is controlled to press the driving wheel 221 downward to tightly press the pipe fitting 400 and start the power trolley 320. The driving wheel 221 drives the pipe fitting 400 to rotate under the drive of the driving device 230. At the same time, the power trolley 320 drives the long rod 350 to enter the inner hole of the pipe fitting 400. In this process, the positive pressure air pipe 352 sprays high-pressure gas into the inner hole of the pipe fitting 400 through the air nozzle 353, so that the residual liquid in the pipe can flow in the moving direction of the long rod 350 under the blowing of the high-pressure gas, thereby ensuring that the polishing unit 351 and the inner hole of the pipe fitting 400 are dry friction. With the gradual deepening of the long rod 350, the residual liquid in the pipe is finally blown away from the pipe fitting 400 under the blowing of the high-pressure gas. At this time, the polishing unit 351 also completes the preliminary polishing of the inner hole of the pipe fitting 400. Compared with the prior art, the present application can blow away the liquid remaining in the inner hole of the pipe fitting 400 while polishing the inner hole of the pipe fitting 400, thereby saving the drying process and greatly shortening the production cycle of the pipe fitting 400.

[0037] It needs to be further explained that the first end of the long rod 350 is connected with the negative pressure air pipe 354 communicated with the airflow channel, and the negative pressure air pipe 354 and the positive pressure air pipe 352 do not communicate with the airflow channel at the same time, that is, the negative pressure air pipe 354 and the positive pressure air pipe 352 are both provided with electromagnetic valves, and the two electromagnetic valves cannot be opened at the same time. When the power trolley 320 drives the long rod 350 to reset, in this process, the polishing unit 351 performs secondary polishing on the inner hole of the pipe fitting 400, and since there are polishing debris in the inner hole of the pipe fitting 400, the negative pressure air pipe 354 replaces the positive pressure air pipe 352 to provide negative pressure suction force for the airflow channel, so that the polishing debris can be sucked into the airflow channel by the air nozzle 353 and discharged with the negative pressure air pipe 354, so as to save the debris removal process after polishing, thereby further shortening the production cycle of the pipe fitting 400.

[0038] In some embodiments of the utility model, in order to improve work efficiency, the number of supporting parts 101 is provided with multiple, all supporting parts 101 are arranged along the left-right direction interval, correspondingly, the number of driving wheels 221 is consistent with the number of supporting assemblies 110, and the number of long rods 350 is consistent with the number of supporting parts 101, so as to meet the simultaneous processing of multiple pipe fittings 400. Assuming that the number of supporting parts 101 is three, then three pipe fittings 400 can be placed on the supporting assembly 100 at the same time, each pipe fitting 400 is respectively responsible for providing power by the corresponding driving wheel 221, and each pipe fitting 400 is respectively responsible for inner polishing by the corresponding long rod 350. If one pipe fitting 400 is supported by two supporting assemblies 110, then one pipe fitting 400 is responsible for providing power by two driving wheels 221, generally, two driving wheels 221 are respectively located at the front and rear of the pipe fitting 400, so as to avoid that the pipe fitting 400 cannot rotate uniformly due to insufficient driving force; by analogy, three pipe fittings 400 are supported by six supporting assemblies 110, and three pipe fittings 400 are responsible for providing power by six driving wheels 221. If one pipe fitting 400 is supported by three supporting assemblies 110, then one pipe fitting 400 is responsible for providing power by three driving wheels 221, generally, three driving wheels 221 are respectively located at the front, middle and rear positions of the pipe fitting 400, so as to avoid that the pipe fitting 400 cannot rotate uniformly due to insufficient driving force; by analogy, three pipe fittings 400 are supported by nine supporting assemblies 110, and three pipe fittings 400 are responsible for providing power by nine driving wheels 221.

[0039] In other embodiments, the driving wheels 221 can also be located directly above the two pipes 400, at which time one driving wheel 221 abuts against two pipes 400 to drive the two pipes 400 to rotate synchronously. If one pipe 400 is supported by two supporting assemblies 110, then three pipes 400 are supported by six supporting assemblies 110, and the three pipes 400 are driven by four driving wheels 221. If one pipe 400 is supported by three supporting assemblies 110, then three pipes 400 are supported by nine supporting assemblies 110, and the three pipes 400 are driven by six driving wheels 221.

[0040] Further, in order to save manufacturing costs, each driving assembly 220 is provided with a plurality of driving wheels 221 arranged at intervals in the left-right direction, all the driving wheels 221 of each driving assembly 220 are connected synchronously through a transmission pair 240, and the transmission pair 240 of each driving assembly 220 is driven by a driving device 230, so that all the driving wheels 221 of each driving assembly 220 have a synchronous rotation connection relationship. When one driving device 230 is started, all the driving wheels 221 having a transmission relationship with it also rotate synchronously, thereby driving all the pipes 400 to rotate at the same speed. If each pipe 400 is supported by two supporting assemblies 110, then the number of driving assemblies 220 is two; if each pipe 400 is supported by three supporting assemblies 110, then the number of driving assemblies 220 is three, and so on.

[0041] Further, in order to save manufacturing costs, all the driving wheels 221 of each driving assembly 220 are connected through an installation frame 250, and each installation frame 250 is connected with a lifting device 210, that is, a plurality of driving wheels 221 share one lifting device 210, so as to effectively reduce the number of lifting devices 210. When the lifting device 210 extends downward, the entire driving assembly 220 moves downward; when the lifting device 210 retracts upward, the entire driving assembly 220 moves upward.

[0042] The pipe 400 according to the second aspect embodiment of the present application is processed by the inner polishing machine according to the first aspect embodiment of the present application.

[0043] Since the pipe 400 adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0044] The utility model embodiment makes the detailed explanation in combination with the drawing, but the utility model is not limited to the above -mentioned embodiment, still can make various changes in the knowledge range of ordinary skill in the art person who has possessed under the premise of not departing from the utility model tenet.

Claims

1. An internal polishing machine characterized by, The application relates to a pipe polishing device. The pipe polishing device comprises a supporting assembly (100) provided with a supporting part (101) having a supporting space arranged along a front-rear direction, the supporting space being used for supporting a pipe (400); a driving frame (200) provided with a driving wheel (221) capable of ascending and descending, the driving wheel (221) being located above the supporting assembly (100), a moving path of the driving wheel (221) intersecting the pipe (400), the driving wheel (221) being driven by a driving device (230), the driving wheel (221) having a rotating axis arranged along the front-rear direction; and a polishing assembly (300) comprising a base (310), a power trolley (320) and a long rod (350), the base (310) being located at a front side or a rear side of the supporting assembly (100), the power trolley (320) being slidingly connected to the base (310) along the front-rear direction, the power trolley (320) being connected with the long rod (350), the long rod (350) being coaxial with the pipe (400), the long rod (350) being internally provided with an airflow channel, the long rod (350) being connected with a positive pressure air pipe (352) communicated with the airflow channel, a terminal end of the long rod (350) being provided with a polishing unit (351) and an air nozzle (353) communicated with the airflow channel, the air nozzle (353) being closer to the supporting assembly (100) than the polishing unit (351). The long rod (350) is connected with a negative pressure air pipe (354) communicated with the airflow channel, the negative pressure air pipe (354) and the positive pressure air pipe (352) are not simultaneously communicated with the airflow channel. The supporting part (101) comprises a plurality of supporting components (110), all the supporting components (110) being arranged along the front-rear direction, each of the supporting components (110) being provided with two rotating rollers (111), the two rotating rollers (111) being arranged along the left-right direction, a spacing between the two rotating rollers (111) being smaller than a diameter of the pipe (400), and all the rotating rollers (111) jointly forming the supporting space.

2. The internal polishing machine of claim 1, wherein: The number of the supporting parts (101) is multiple, all the supporting parts (101) being arranged along the left-right direction, and the number of the long rods (350) is consistent with the number of the supporting parts (101).

3. The internal polishing machine of claim 1, wherein: The number of the driving wheels (221) is consistent with the number of the supporting components (110), and the driving wheels (221) are located directly above the corresponding supporting spaces.

4. The internal polishing machine of claim 3, wherein: All the driving wheels (221) form a plurality of driving components (220), each of the driving components (220) being provided with a plurality of driving wheels (221) arranged along the left-right direction, and all the driving wheels (221) of each of the driving components (220) are jointly connected with a transmission pair (240).

5. The internal polishing machine of claim 4, wherein: The driving frame (200) is connected with a plurality of lifting devices (210), and each of the lifting devices (210) is connected with the driving component (220).

6. The internal polishing machine of claim 5, wherein: The polishing unit (351) is detachably connected with the long rod (350).

7. The internal polishing machine of claim 6, wherein: ​ 8. The internal polishing machine of claim 1, wherein: ​ 9. The internal polishing machine of claim 1, wherein: The polishing assembly (300) further comprises a driven trolley (330) located between the power trolley (320) and the support assembly (100), the driven trolley (330) being slidingly connected to the base (310) in the front-rear direction, the driven trolley (330) being provided with an intermediate bracket (331) for supporting the long rod (350), and the driven trolley (330) and the power trolley (320) being connected by a flexible traction unit (332).

10. A pipe fitting characterised by: The pipe (400) is processed by the internal polishing machine according to any one of claims 1 to 9.

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