Bidirectional roller file

By designing a two-way roller file, the problems of unstable file holding and difficulty in switching concave roller cams were solved, resulting in improved filing quality and efficiency, prevention of pipe wall damage, simplification of operation procedures, and expansion of applicability.

CN223616886UActive Publication Date: 2025-12-02BOHAI SHIPYARD GROUP CORP LTD
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Patent Information

Application Number
CN202422990726.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-12-05
Publication Date
2025-12-02
Estimated Expiration
2034-12-05

AI Technical Summary

Technical Problem

In existing technologies, the file is not easy to hold and the switching between the concave wheel and the cam is difficult, resulting in uneven grinding quality and easy damage to the pipe wall. In particular, it has a serious impact on the quality of bright stainless steel pipes, iron-copper pipes, copper pipes and nuclear-grade pipes.

Method used

Design a two-way roller file. The roller assembly supports the front end of the file to form a rolling support point. The roller combines a concave wheel and a cam. Combined with the handle connecting post and connecting block, it realizes two-point grip and can detachably switch between the concave wheel and the cam to enhance grip stability and guidance.

Benefits of technology

It improves filing quality and efficiency, avoids damage to pipe walls, simplifies operation procedures, reduces training cycles, and expands applicability and storage convenience.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a bidirectional roller file. Comprising a file, a connecting base, a grip connecting column, a connecting block and a rolling assembly. The file is used for manual filing operation; the connecting base is connected with the head end of the file and used for containing the head end of the file. The grip connecting columns are arranged at the top and the bottom of the connecting base respectively and used for being connected with the grip, a two-way holding point is formed at the head end of the file, the requirement that the file selects the file body for filing is met, and the grip connecting columns and a holding point of a file handle at the tail end of the file jointly act on the file to form two-point holding. The connecting block is arranged at the front end of the connecting seat; the rolling assembly is connected with the connecting block, and a rolling wheel is arranged in the rolling assembly and used for forming a rolling supporting point at the head end of the file. Wherein the rolling wheel comprises a cam and a concave wheel, the cam and the concave wheel are distributed in a 90-degree mode, the rolling assembly is detachably connected with the connecting block, the concave wheel and the cam can be switched, and the filing requirement is met. The filing work efficiency is improved. The bidirectional roller file is suitable for being used.
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Description

Technical Field

[0001] This utility model relates to files in the field of machinery, and more particularly to a bidirectional roller file. Background Technology

[0002] Shipbuilding is a complex field involving the processing and assembly of pipes made of various materials. High quality requirements are placed on the pipe end faces during construction, especially since shipbuilding typically employs segmented pre-assembly and modular fabrication methods. Pipes frequently require cutting during construction, particularly using tools like horizontal band saws, toothed saws, and handheld electric grinders, resulting in burrs on the cut ends. These burrs often require manual grinding. Metal burrs are generally hard, and manual grinding requires applying pressure to remove them. Controlling the grinding force, time, and angle is difficult and virtually unrestricted, leading to a high degree of freedom in manual grinding. However, standardizing the manual grinding process is challenging, making it difficult for process engineers to streamline and parameterize the process. The angle of the worker's hand is also unpredictable, resulting in varying grinding effects. Basic process guidelines are often not very practical, and operator training relies heavily on extensive experience, leading to long training periods and a significant impact on overall grinding quality.

[0003] However, in the process of implementing the inventive technical solution in the embodiments of this application, the inventors of this application discovered that the above-mentioned technology has at least the following technical problems:

[0004] 1. When using a file for manual polishing, uneven polishing depth is often observed, and the pipe wall is easily damaged due to an unstable grip on the polishing tool. Polishing damage to carbon steel pipes is generally not noticeable and has a relatively small impact on overall quality. However, the walls of bright stainless steel pipes, copper-plated iron pipes, copper pipes, and nuclear-grade pipes are very easily damaged. Once scratches, abrasions, or excessive polishing occur, the damage is generally irreversible and directly affects the pipe quality.

[0005] 2. Pipe construction often requires grinding of both the inner and outer walls. The inner wall of the pipe needs rolling support in the form of a cam, while the outer wall needs rolling support in the form of a concave wheel. Manual grinding often requires changing the concave wheel and cam. Knowing how to easily and quickly switch the working angle of the concave cam is very important for improving the working efficiency of the file. Summary of the Invention

[0006] To address the shortcomings of existing technologies and the issues related to stable file gripping and cam switching, this application provides a bidirectional roller file. This file utilizes a roller assembly to support the front end of the file, forming a rolling support point and enhancing grip stability. The roller assembly also incorporates a concave wheel and a cam. A handle is screwed into the handle, creating a grip at the file's tip, which, together with the grip at the file's handle, provides a two-point grip. This solves the technical problems related to file gripping and cam switching.

[0007] The solution adopted by the embodiments of this application to solve the technical problem is:

[0008] A dual-roller file includes a file, a connecting seat, a handle connecting post, a connecting block, and a rolling assembly;

[0009] The file is used for manual filing operations; the connecting seat is connected to the head end of the file and is used to accommodate the head end of the file;

[0010] The handle connecting posts are respectively set at the top and bottom of the connecting seat to connect the handle, forming a two-way grip point at the head of the file, which meets the needs of the file to select the file body for filing. Together with the grip point of the file handle at the tail end of the file, they work together to form a two-point grip on the file; the connecting block is set at the front end of the connecting seat; the rolling assembly is connected to the connecting block, and a roller is set in the rolling assembly to form a rolling support point at the head of the file;

[0011] The roller includes a cam and a concave wheel, which are distributed at 90°. The rolling assembly and the connecting block are detachably connected. The concave wheel and the cam can be switched to meet filing requirements.

[0012] In order to further solve the technical problems to be solved by the embodiments of this application, the connecting seat provided in the embodiments of this application includes a seat body and a seat platform;

[0013] The base is located at one end of the connecting seat and has a storage slot for storing the connecting file. The top and bottom of the storage slot are respectively provided with handle connecting posts for connecting the handle. Screw holes are provided on both sides of the handle connecting post at the bottom of the storage slot. The fixing screws are screwed into the screw holes and extend into the storage slot through the screw holes to lock and fix the file inserted into the file storage slot. The platform is located at the other end of the connecting seat and has blind holes for assembling the connecting block.

[0014] Furthermore, the connecting block is a rod structure, with one end connected to the connecting seat and the other end connected to the rolling assembly, thus transitioning the rolling assembly to the connecting seat; wherein, one end of the connecting block is inserted into the blind hole of the seat for fixation, and the other end of the connecting block is provided with a through fixing hole and a locking hole for assembling and connecting the rolling assembly, wherein the centers of the fixing hole and the locking hole are collinear.

[0015] Furthermore, the rolling assembly includes a rolling support, rollers, and wheels;

[0016] The rolling support is an L-shaped frame with a shaft hole in the middle and pin holes distributed at 90° on both sides of the shaft hole. The centers of the shaft hole and the pin holes are collinear. The shaft hole matches the fixing hole in the connecting block, and the pin holes match the locking hole in the connecting block. The distance between the shaft hole and the pin holes is the same as the distance between the fixing hole and the locking hole. The rollers include cams and concave wheels, which are distributed at both ends of the rolling support. The cams and concave wheels can be switched to meet filing requirements. The concave wheels are used to remove burrs from the outer end of the pipe, and the cams are used to remove burrs from the inner end of the pipe. The roller shaft is used to assemble the rollers onto the rolling support.

[0017] Specifically, the rolling assembly is assembled onto the connecting block by passing the rotating shaft through the shaft hole and then through the fixing hole, so that the roller forms a rolling support point at the beginning of the file; the cam and the concave wheel are limited and fixed after being switched vertically at 90° by passing the pin shaft through the pin hole and the locking hole.

[0018] Furthermore, the grip connecting posts are located at the top and bottom of the connector, respectively, and have inner holes for connecting the grip; the grip is a T-shaped grip.

[0019] Furthermore, the rollers are made of nylon.

[0020] Positive effects: The technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0021] 1. Because the embodiments of this application adopt the technical means of connecting one end of the connecting seat to the head end of the file, and having handle connecting posts at the top and bottom of the connecting seat, when the handle connecting post is equipped with a handle, the corresponding handle can be selected to meet the needs of the file to select the file body for filing. It forms two gripping points with the file handle at the tail end of the file, effectively solving the technical problem of holding the file stably in the prior art. When horizontal thrust and vertical pressure are applied to the file, the two gripping points can control the force, thereby achieving the technical effect of enhancing the stability during filing and improving the quality of the file filing.

[0022] 2. Because the embodiments of this application adopt the technical means of connecting a file to a connecting block and a rolling component in sequence via a connecting seat, and setting a roller on the rolling component, the tip of the file has a rolling support point and can make linear motion, which effectively solves the technical problem of holding the file stably in the prior art. When the file is filing, it can have guidance and maintain the balance and stability of the file, thereby achieving the technical effect of improving the filing quality.

[0023] 3. Because the embodiments of this application adopt the technical means of using a roller including a cam and a concave wheel, with the cam and the concave wheel distributed at 90°, the rolling component and the connecting block are detachably connected, the inner wall of the pipe is used for the cam, and the outer wall of the pipe is used for the concave wheel, the working mode of the concave wheel and the cam can be satisfied at the same time, which effectively solves the technical problem of switching between the cam and the concave wheel in the prior art. The concave wheel and the cam can be switched to meet the filing requirements, thereby achieving the technical effect of improving the filing work efficiency.

[0024] 4. Because the embodiments of this application use a fixing screw to tighten through the screw hole to fix the file in the storage groove of the connecting seat, the file can rotate slightly in the storage groove to adjust the connection angle between the file and the connecting seat. This effectively solves the technical problem of holding the file stably and guiding the file to move stably in a straight line in the prior art, thereby achieving the technical effect of improving the filing quality and efficiency.

[0025] 5. Because the embodiments of this application adopt the technical means of vertically arranging concave wheels and cams and right-angled rolling components, the technical problem of stably holding the file and guiding the file to move stably in a straight line in the prior art is effectively solved. It saves more space in the vertical direction, effectively reduces the interference between the rolling components and the pipe wall or surrounding obstacles, and also facilitates the daily storage of the device, thus achieving the technical effect of wide applicability.

[0026] It is suitable for use as a two-way roller file. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is the southeast isometric view of this embodiment;

[0029] Figure 2 This is the northwest isometric view of this embodiment;

[0030] Figure 3 This is the front view of this embodiment;

[0031] Figure 4 This is a front sectional view of this embodiment;

[0032] Figure 5 This is a top view of this embodiment;

[0033] Figure 6 This is the southeast isometric view of the connector.

[0034] Figure 7 Northwest isometric view of the connector;

[0035] Figure 8 This is an isometric sectional view of the southeast side of the connector.

[0036] Figure 9 This is an isometric sectional view of the northwest side of the connector.

[0037] Figure 10 This is a front sectional view of the connector.

[0038] Figure 11 Northwest isometric view of the connecting block;

[0039] Figure 12 This is the northeast isometric view of the scroll component.

[0040] In the picture:

[0041] 100. File;

[0042] 200. Connector

[0043] 210. base body,

[0044] 211. Storage tray,

[0045] 212. Screw hole,

[0046] 220. Stand,

[0047] 221. Blind hole;

[0048] 300. Grip connecting post;

[0049] 400. Connector block,

[0050] 410. Fixing hole,

[0051] 420. Locking hole;

[0052] 500. Scrolling component,

[0053] 510. Rolling support,

[0054] 511. Shaft hole,

[0055] 512. Pin hole,

[0056] 520. Roller

[0057] 530. Rollers;

[0058] 600. Fixing screws;

[0059] 700. Shaft;

[0060] 800. Pin. Detailed Implementation

[0061] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0062] This application provides a bidirectional roller file, which solves the problem in the prior art where the file 100 is easily switched between gripping and using the concave wheel / cam. The file 100 utilizes a rolling assembly 500 to support the front end of the file 100, forming a rolling support point. Simultaneously, the roller 520 in the rolling assembly 500 also functions as a concave wheel and a cam, allowing for easy switching to meet filing needs. A handle connecting post 300 is provided on the connecting seat 200 to connect to the handle, forming a gripping point at the head of the file 100 and a gripping point at the handle at the tail end of the file 100, thus achieving stable gripping and guiding straight-line filing.

[0063] According to the instruction manual Figure 1-5 As shown, a dual-roller file includes a file 100, a connecting seat 200, a handle connecting post 300, a connecting block 400, and a rolling assembly 500;

[0064] File 100 is used for manual filing operations;

[0065] The connecting seat 200 is connected to the head end of the file 100 and is used to receive the head end of the file 100;

[0066] The handle connecting post 300 is respectively set at the top and bottom of the connecting seat 200 for connecting the handle, forming a two-way grip point at the head end of the file 100, which meets the needs of the file 100 to select the file body for filing. Together with the grip point of the handle of the file 100 at the tail end of the file 100, they work together to form a two-point grip on the file 100, applying horizontal thrust and vertical pressure to maintain the force balance of the file 100 for filing operations.

[0067] The connecting block 400 is located at the front end of the connecting seat 200;

[0068] The rolling assembly 500 is connected to the connecting block 400. A roller 520 is provided in the rolling assembly 500 to form a rolling support point at the tip of the file 100 and guide the linear motion, thereby stably holding the file 100 for filing, thus avoiding damage to the workpiece to be filed and improving the quality of filing.

[0069] The roller 520 includes a cam and a concave wheel, which are distributed at 90°. The rolling assembly 500 is detachably connected to the connecting block 400, so that the concave wheel and the cam can be switched to meet the filing requirements and improve the filing efficiency.

[0070] The technical solutions described in the embodiments of this application above have at least the following technical effects or advantages:

[0071] Since one end of the connecting seat 200 is connected to the head end of the file 100, and the top and bottom of the connecting seat 200 have handle connecting posts 300 respectively, when a handle is installed on the handle connecting post 300, the corresponding handle can be selected to meet the needs of the file 100 to select the file body for filing. It forms two gripping points with the handle of the file 100 at the tail end of the file 100, and applies horizontal thrust and vertical pressure to the file 100. The two gripping points can control the force, enhance the stability during filing, and improve the filing quality of the file 100.

[0072] Since the file 100 is connected to the connecting block 400 and the rolling assembly 500 in sequence through the connecting seat 200, and the rolling assembly 500 is equipped with a roller 520, the head end of the file 100 has a rolling support point and can make linear motion. When the file 100 is filing, it can be guided, maintain the balance and stability of the file 100, and improve the quality of filing.

[0073] Since the roller 520 includes a cam and a concave wheel, with the cam and concave wheel distributed at 90°, and the rolling assembly 500 is detachably connected to the connecting block 400, the concave wheel and the cam can be switched to meet filing requirements and improve filing efficiency.

[0074] In this embodiment, file 100 is a semi-circular file used to remove burrs from the pipe end.

[0075] To ensure the stability of the structure in this embodiment, please refer to the appendix to the specification. Figure 6-10 The connecting seat 200 is connected to the file 100 at one end and to the rolling assembly 500 at the other end via the connecting block 400; it includes a seat body 210 and a seat platform 220;

[0076] A base 210 is disposed at one end of a connecting base 200. A storage groove 211 is provided on the base 210. The storage groove 211 is a hollow structure that opens outwards and is used to store the connecting file 100. A handle connecting post 300 is provided at the top and bottom of the storage groove 211 to connect the handle and form a force application point at the tip of the file 100, applying force and maintaining the force balance of the file 100. Screw holes 212 are provided on both sides of the handle connecting post 300 at the bottom of the storage groove 211. A fixing screw 600 is screwed into the screw hole 212. The fixing screw 600 passes through the screw hole 212 and extends into the storage groove 211 to lock and fix the file 100 inserted into the file 100 storage groove 211.

[0077] The base 220 is located at the other end of the connecting base 200, and a blind hole 221 is provided on the base 220 for assembling the connecting block 400.

[0078] The technical solutions described in the embodiments of this application above have at least the following technical effects or advantages:

[0079] Since the fixing screw 600 is tightened through the screw hole 212, the file 100 is fixed in the storage groove 211 of the connecting seat 200. Therefore, the file 100 can rotate slightly in the storage groove 211 to adjust the connection angle between the file 100 and the connecting seat 200, so that the whole device forms a rigid structure that can rotate slightly.

[0080] To further ensure the stability of this example structure, please refer to the appendix of the instruction manual. Figure 11 The connecting block 400 is a rod structure, with one end connected to the connecting seat 200 and the other end connected to the rolling assembly 500, thus transitioning the rolling assembly 500 to the connecting seat 200. One end of the connecting block 400 is inserted into the blind hole 221 of the seat 220 for fixation, and the other end of the connecting block 400 is provided with a through fixing hole 410 and a locking hole 420 for combining and connecting the rolling assembly 500. The centers of the fixing hole 410 and the locking hole 420 are collinear.

[0081] In this embodiment, the connecting block 400 has a rectangular cross-section, and the base 220 and blind hole 221 are also rectangular. The connecting block 400 and blind hole 221 are matched with each other, and the connecting block 400 is inserted into the blind hole 211 and welded to fix it.

[0082] To optimize the structure of this embodiment, please refer to the appendix to the specification. Figure 12 The rolling assembly 500 is used to support the file 100, so that the tip of the file 100 forms a rolling support point, and the file 100 performs filing smoothly; it includes a rolling bracket 510, a roller 530 and a roller 520.

[0083] The rolling bracket 510 is an L-shaped frame. A shaft hole 511 is provided in the middle of the rolling bracket 510. Pin holes 512 are provided on both sides of the shaft hole 511 at 90°. The centers of the shaft hole 511 and the pin holes 512 are collinear. The shaft hole 511 matches the fixing hole 410 in the connecting block 400, and the pin holes 512 match the locking hole 420 in the connecting block 400. The hole spacing of the shaft hole 511 and the pin holes 512 is the same as the hole spacing of the fixing hole 410 and the locking hole 420.

[0084] The roller 520 includes a cam and a concave wheel, which are distributed at both ends of the rolling support 510. The cam and the concave wheel can be switched to meet the filing requirements. The concave wheel is used to remove burrs from the outer end of the pipe, and the cam is used to remove burrs from the inner end of the pipe. It has better guidance and ensures that the working trajectory of the file 100 is a linear motion.

[0085] Roller 530 is used to mount roller 520 onto rolling bracket 510;

[0086] Specifically, the rotating shaft 700 passes through the shaft hole 511 and then through the fixing hole 410 to assemble the rolling assembly 500 onto the connecting block 400, so that the roller 520 forms a rolling support point at the head end of the file 100; the pin shaft 800 passes through the pin hole 512 and the locking hole 420 to limit and fix the cam and the concave wheel after a 90° vertical switch.

[0087] In this embodiment, when the roller 520 is worn, the roller 520 can be replaced by disassembling the roller 530 without replacing the rolling assembly 500, which is convenient and quick and reduces the cost of filing.

[0088] The technical solutions described in the embodiments of this application above have at least the following technical effects or advantages:

[0089] Since the roller 520 includes a cam and a concave wheel, which are distributed at both ends of the rolling bracket 510, the cam and the concave wheel can be switched. The cam is used for working on the inner wall of the pipe, and the concave wheel is used for working on the outer wall of the pipe, so that the working mode of the concave wheel and the cam can be satisfied at the same time.

[0090] Because the concave wheel and cam are arranged vertically and the rolling assembly 500 has a right-angle structure, it saves more space in the vertical direction, effectively reduces the interference between the rolling assembly 500 and the pipe wall or surrounding obstacles, and also facilitates the daily storage of the device, making it more widely applicable.

[0091] To further optimize the structure of this embodiment, the grip connecting post 300 is located at the top and bottom of the connecting seat 200, and has an inner hole for connecting the grip; wherein, the grip is a T-shaped grip.

[0092] As a standard technical choice, the roller 520 is made of nylon to prevent scratching the workpiece during rolling.

[0093] It is worth noting that all contents not described in detail in the specification are existing technologies known to those skilled in the art, and the model parameters of fixing screw 600, rotating shaft 700, pin shaft 800 and roller 520 are not specifically limited and can be determined using conventional equipment. Electrical control components not mentioned in this technical solution are not shown in the figure because they are existing technologies, and will not be described here.

[0094] Finally, it should be noted that:

[0095] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A two-way roller file, characterized in that: include: A file (100) for manual filing operations; A connecting seat (200) is connected to the head end of the file (100) and is used to receive the head end of the file (100); A handle connecting post (300) is respectively disposed at the top and bottom of the connecting seat (200) for connecting the handle, forming a bidirectional grip point at the head end of the file (100) to meet the needs of the file (100) to select the file body for filing, and together with the grip point of the handle of the file (100) at the tail end of the file (100), they work together to form a two-point grip on the file (100); A connecting block (400) is disposed at the front end of the connecting seat (200); and A rolling assembly (500) is connected to the connecting block (400), and a roller (520) is provided in the rolling assembly (500) to form a rolling support point at the head end of the file (100); The roller (520) includes a cam and a concave wheel, which are distributed at 90°. The rolling assembly (500) is detachably connected to the connecting block (400). The concave wheel and the cam can be switched to meet the filing requirements.

2. The bidirectional roller file according to claim 1, characterized in that: The connector (200) includes: A base (210) is provided at one end of the connecting seat (200). A storage groove (211) is provided on the base (210) for storing and connecting the file (100). The top and bottom of the storage groove (211) are respectively provided with the handle connecting post (300) for connecting the handle. Screw holes (212) are provided on both sides of the handle connecting post (300) at the bottom of the storage groove (211). A fixing screw (600) is screwed into the screw hole (212). The fixing screw (600) passes through the screw hole (212) and extends into the storage groove (211) to lock and fix the file (100) inserted into the storage groove (211). A base (220) is provided at the other end of the connecting seat (200), and a blind hole (221) is provided on the base (220) for assembling the connecting block (400).

3. A bidirectional roller file according to claim 2, characterized in that: The connecting block (400) is a rod structure, with one end connected to the connecting seat (200) and the other end connected to the rolling assembly (500), thus transitioning the rolling assembly (500) to the connecting seat (200). One end of the connecting block (400) is inserted into the blind hole (221) of the base (220) for fixation, and the other end of the connecting block (400) is provided with a through fixing hole (410) and a locking hole (420) for combining and connecting the rolling assembly (500). The centers of the fixing hole (410) and the locking hole (420) are collinear.

4. A bidirectional roller file according to claim 3, characterized in that: The scrolling component (500) includes: A rolling bracket (510) is an L-shaped frame. A shaft hole (511) is provided in the middle of the rolling bracket (510). Pin holes (512) are provided on both sides of the shaft hole (511) at a 90° angle. The centers of the shaft hole (511) and the pin holes (512) are collinear. The shaft hole (511) matches the fixing hole (410) in the connecting block (400). The pin holes (512) match the locking holes (420) in the connecting block (400). The hole spacing of the shaft hole (511) and the pin holes (512) is the same as the hole spacing of the fixing hole (410) and the locking hole (420). Roller (520), comprising a cam and a concave wheel, distributed at both ends of the rolling support (510), the cam and concave wheel switching to meet filing requirements; wherein, the concave wheel is used for removing burrs from the outer end of the pipe, and the cam is used for removing burrs from the inner end of the pipe; and A roller (530) is used to mount the roller (520) onto the rolling bracket (510); The rolling assembly (500) is assembled on the connecting block (400) by passing the rotating shaft (700) through the shaft hole (511) and then through the fixing hole (410), so that the roller (520) forms a rolling support point at the head end of the file (100); the cam and the concave wheel are limited and fixed after being vertically switched at 90° by passing the pin hole (512) and the locking hole (420) through the pin shaft (800).

5. A bidirectional roller file according to claim 1, characterized in that: The grip connecting post (300) is located at the top and bottom of the connecting seat (200) respectively, and has an inner hole for connecting the grip; wherein the grip is a T-shaped grip.

6. A bidirectional roller file according to claim 4, characterized in that: The roller (520) is made of nylon.