Portable pipe ring cutting and beveling machine

Abstract

This utility model provides a portable pipe annular cutting and beveling machine, including a support ring, a clamping and limiting assembly mounted on the support ring for clamping the pipe, a movable ring rotatably connected to the support ring, a rotary drive assembly for driving the movable ring to rotate relative to the support ring, a slide assembly mounted on the movable ring, a tool holder slidably connected to the slide assembly and movable radially relative to the slide assembly along the support ring, a feed transmission assembly mounted on the slide assembly for driving the tool holder to move, and a ratchet module mounted on the input shaft of the feed transmission assembly. It also includes a paddle base mounted on the support ring, a paddle movably connected to the paddle base, an elastic element for moving the paddle away from the paddle base, and a pressure block mounted on the paddle base for limiting the movement of the paddle away from the paddle base; wherein the paddle can cooperate with the ratchet module. This utility model can improve the service life of parts.

Description

Technical Field

[0001] This utility model relates to the field of pipe cutting and beveling technology, and in particular to a portable pipe ring cutting and beveling machine. Background Technology

[0002] Currently, steel pipe beveling typically involves lathe turning, oxy-acetylene cutting, or manual grinding. Lathe turning equipment is bulky and heavy, suitable only for fixed locations; for large-diameter steel pipes, transportation and clamping are inconvenient. While oxy-acetylene cutting or manual grinding allows on-site processing, it produces poor surface quality and is inefficient. Furthermore, heating the workpiece alters the metal lattice, changing the internal material properties and reducing the workpiece's temperature and pressure resistance. Therefore, this paper proposes an online pipe beveling machine. This beveling machine includes a movable ring, a support ring, a clamping and limiting assembly, a rotary drive assembly, a tool holder, a feed assembly, and a lever assembly. The movable ring and the support ring are rotatably connected. The clamping and limiting assembly for clamping the pipe is mounted on the support ring. The rotary drive assembly drives the movable ring to rotate relative to the support ring. The tool holder is mounted on the movable ring, and the feed assembly for driving the cutting tool forward is mounted on the tool holder. The lever assembly is mounted on the support ring. The feed assembly and the lever assembly cooperate to drive the feed assembly forward. In this type of pipe cutting beveling machine, the lever assembly typically uses a ram-driven ratchet module for feed during the feed process. However, existing lever assemblies use hard impacts, which easily damage the lever assembly and ratchet module, resulting in a short service life for the parts.

[0003] Therefore, it is necessary to design a portable pipe ring cutting and beveling machine to improve the service life of parts. Utility Model Content

[0004] The purpose of this invention is to provide a portable pipe ring cutting and beveling machine to solve the problem of short service life of parts in existing portable pipe ring cutting and beveling machines.

[0005] To solve the above-mentioned technical problems, this utility model provides a portable pipe annular cutting and beveling machine, including a support ring, a clamping and limiting assembly mounted on the support ring for clamping the pipe, a movable ring rotatably connected to the support ring, a rotary drive assembly for driving the movable ring to rotate relative to the support ring, a slide assembly mounted on the movable ring, a tool holder slidably connected to the slide assembly and movable radially relative to the slide assembly along the support ring, a feed transmission assembly mounted on the slide assembly for driving the tool holder to move, and a ratchet module mounted on the input shaft of the feed transmission assembly. It also includes a paddle base mounted on the support ring, a paddle movably connected to the paddle base, an elastic element for moving the paddle away from the paddle base, and a pressure block mounted on the paddle base for limiting the movement of the paddle away from the paddle base; wherein the paddle can cooperate with the ratchet module.

[0006] Optionally, the lever is hinged to the lever base, the elastic element is used to rotate the lever away from the lever base, and the pressure block is used to restrict the lever from rotating away from the lever base.

[0007] Optionally, one end of the lever is hinged to the lever base, and the pressure block contacts the other end of the lever.

[0008] Optionally, the other end of the push block extends with a first step portion, and the pressure block extends with a second step portion that mates with the first step portion, wherein the step surfaces of the first step portion and the second step portion mate with each other.

[0009] Optionally, the elastic element is a spring.

[0010] Optionally, the paddle base includes a paddle support mounted on the support ring, a slide mounted on the paddle support that is radially movable relative to the paddle support along the support ring, and a fastener for detachably mounting the slide on the paddle support, wherein the paddle is movably connected to the slide, and the pressure block is mounted on the slide.

[0011] Optionally, the feed transmission assembly includes a feed support mounted on the slide assembly, a gear shaft rotatably mounted on the feed support, a feed shaft rotatably mounted on the feed support, and a feed gear mounted on the feed shaft. The feed gear meshes with the gear shaft, the ratchet module is mounted on the gear shaft, and the feed shaft is threadedly connected to the tool holder.

[0012] Optionally, the ratchet module includes two connected ratchet wheels, a first ratchet and a second ratchet, with different numbers of teeth. There are two paddle blocks, designated as a first paddle block and a second paddle block. There are also two elastic elements. The two paddle blocks are arranged side-by-side along the radial direction of the support ring, with one elastic element corresponding to one paddle block. The pressure block causes the two paddle blocks to move away from the paddle block base. The ratchet module can slide axially along the gear shaft. The ratchet module has a first position and a second position. When the ratchet module is in the first position, the first ratchet can engage with the first paddle block, and the second ratchet does not engage with the second paddle block. When the ratchet module is in the second position, the second ratchet can engage with the second paddle block, and the first ratchet does not engage with the first paddle block.

[0013] Optionally, a groove is provided on the side of the ratchet module that contacts the gear shaft. Two sets of balls and springs are provided on the gear shaft along the axial direction. The springs cause the balls to protrude from the outer surface of the gear shaft. The balls cooperate with the groove to limit the axial movement of the ratchet module along the gear shaft.

[0014] Optionally, the movable ring includes a first movable half-ring, a second movable half-ring, a movable pin, and a movable fastener. The first movable half-ring and the second movable half-ring are spliced ​​together and fixed by the movable pin and the movable fastener. The support ring includes a first support half-ring, a second support half-ring, a support pin, and a support fastener. The first support half-ring and the second support half-ring are spliced ​​together and fixed by the support pin and the support fastener.

[0015] The portable pipe ring cutting and beveling machine provided by this utility model has the following beneficial effects:

[0016] Because the clamping and limiting assembly is mounted on the support ring and used to clamp the pipe, the portable pipe annular cutting and beveling machine can clamp the pipe. Since the movable ring is rotatably connected to the support ring, the rotary drive assembly drives the movable ring to rotate relative to the support ring. The slide assembly is mounted on the movable ring, and the tool holder is slidably connected to the slide assembly and can move radially relative to the slide assembly along the support ring. Therefore, the tool holder can be driven to rotate around the axis of the support ring, thus allowing the tool on the tool holder to rotate around the pipe clamped and limiting assembly, thereby achieving cutting or beveling. Since the feed transmission assembly is mounted on the slide assembly to drive the tool holder to move, and the ratchet module is mounted on the input shaft of the feed transmission assembly, rotating the ratchet module drives the tool holder to move, thereby achieving... The tool feeds into the feed position, and the ratchet module can rotate around the axis of the support ring. Since the lever can engage with the ratchet module, the ratchet module engages with the lever once per revolution around the axis of the support ring. This allows the lever to rotate the ratchet module, thus enabling the tool to feed into the feed position. Because the lever base is mounted on the support ring, and the lever is movably connected to the lever base, the elastic element allows the lever to move away from the lever base, and the pressure block is mounted on the lever base to restrict this movement. Therefore, when encountering excessive impact force or an unfavorable impact angle, the lever will compress the elastic element, causing the lever to move closer to the lever base, thereby reducing hard impacts, minimizing damage to parts caused by impacts, and extending the service life of the parts. Attached Figure Description

[0017] Figure 1 This is a top view of the portable pipe ring cutting and beveling machine in this embodiment of the present invention;

[0018] Figure 2 yes Figure 1 A cross-sectional view of a portable pipe ring cutting beveling machine along the AA direction;

[0019] Figure 3 yes Figure 1 A cross-sectional view of a portable pipe ring cutting and beveling machine along the BB direction;

[0020] Figure 4 yes Figure 1 A cross-sectional view of a portable pipe ring cutting and beveling machine along the CC direction;

[0021] Figure 5 This is a front view of the portable pipe ring cutting and beveling machine in this embodiment of the utility model;

[0022] Figure 6 yes Figure 5 A partial sectional view;

[0023] Figure 7 This is a front view of the movable ring of the portable pipe annular cutting and beveling machine in this embodiment of the present invention;

[0024] Figure 8 This is a front view of the support ring of the portable pipe ring cutting and beveling machine in this embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures:

[0026] 100 - Support ring; 110 - First support half ring; 120 - Second support half ring; 130 - Support pin; 140 - Support fastener; 150 - Slide groove; 160 - Roller;

[0027] 200-Clamping and limiting assembly;

[0028] 300 - Movable circle; 310 - First half-circle of movable circle; 320 - Second half-circle of movable circle; 330 - Movable pin; 340 - Movable fastener;

[0029] 400 - Rotary drive assembly; 420 - Motor mount; 430 - Gearbox; 440 - Motor connecting shaft; 450 - Small bevel gear; 460 - Large bevel gear; 470 - Drive shaft; 481 - Drive pinion; 482 - Drive large gear; 490 - Driven gear shaft;

[0030] 500-Slide assembly;

[0031] 600-tool holder;

[0032] 700 - Feed drive assembly; 710 - Feed support; 720 - Gear shaft; 730 - Feed shaft; 740 - Feed gear;

[0033] 800 - Ratchet module; 810 - First ratchet; 820 - Second ratchet;

[0034] 910-Pulling block base; 911-Pulling block support; 912-Slide block; 920-Pulling block; 921-First pulling block; 922-Second pulling block; 930-Elastic element; 940-Pressure block. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0039] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0040] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 , Figure 1 This is a top view of the portable pipe ring cutting and beveling machine in this embodiment of the present invention. Figure 2 yes Figure 1 A cross-sectional view of the portable pipe ring cutting and beveling machine along the AA direction. Figure 3 yes Figure 1 A cross-sectional view of the portable pipe ring cutting and beveling machine along the BB direction. Figure 4 yes Figure 1 A cross-sectional view along the CC direction of a portable pipe ring cutting and beveling machine. Figure 5 This is a front view of the portable pipe ring cutting and beveling machine in this embodiment of the utility model. Figure 6 yes Figure 5 A partial sectional view, Figure 7 This is a front view of the movable ring 300 of the portable pipe annular cutting and beveling machine in this embodiment of the present invention. Figure 8 This is a front view of the support ring 100 of the portable pipe annular cutting and beveling machine in this embodiment of the present invention. This embodiment provides a portable pipe annular cutting and beveling machine, including a support ring 100, a clamping and limiting assembly 200 mounted on the support ring 100 for clamping a pipe, a movable ring 300 rotatably connected to the support ring 100, a rotary drive assembly 400 for driving the movable ring 300 to rotate relative to the support ring 100, a slide assembly 500 mounted on the movable ring 300, and a tool holder 60 slidably connected to the slide assembly 500 and capable of moving radially relative to the slide assembly 500 along the support ring 100. 0, a feed drive assembly 700 mounted on the slide assembly 500 for driving the tool holder 600 to move, a ratchet module 800 mounted on the input shaft of the feed drive assembly 700, a paddle block base 910 mounted on the support ring 100, a paddle block 920 movably connected to the paddle block base 910, an elastic element 930 for moving the paddle block 920 away from the paddle block base 910, and a pressure block 940 mounted on the paddle block base 910 for restricting the movement of the paddle block 920 away from the paddle block base 910; wherein, the paddle block 920 can cooperate with the ratchet module 800.

[0042] Since the clamping and limiting assembly 200 is mounted on the support ring 100 and used to clamp the pipe, the portable pipe annular cutting and beveling machine can clamp the pipe; since the movable ring 300 is rotatably connected to the support ring 100, the rotary drive assembly 400 is used to drive the movable ring 300 to rotate relative to the support ring 100, the slide assembly 500 is mounted on the movable ring 300, and the tool holder 600 is slidably connected to the slide assembly 500 and can move relative to the slide assembly 500 along the support ring. The radial movement of the support ring 100 drives the tool holder 600 to rotate around the axis of the support ring 100. This allows the tool on the tool holder 600 to rotate around the channel of the clamping and limiting assembly 200, thereby achieving cutting or beveling. Since the feed drive assembly 700 is mounted on the slide assembly 500 to drive the tool holder 600, and the ratchet module 800 is mounted on the input shaft of the feed drive assembly 700, rotating the ratchet module 800 drives the tool holder 600 to move, thus achieving... The tool feeds into the feed mechanism, and the ratchet module 800 can rotate around the axis of the support ring 100. Since the lever 920 can engage with the ratchet module 800, the ratchet module 800 engages with the lever 920 once per revolution around the axis of the support ring 100. This allows the lever 920 to rotate the ratchet module 800, thus enabling the tool to feed into the feed mechanism. Because the lever base 910 is mounted on the support ring 100, and the lever 920 is movably connected to the lever base 910, the elastic element 93... The lever 920 is used to move away from the lever base 910, and the pressure block 940 is installed on the lever base 910 to restrict the movement of the lever 920 away from the lever base 910. Therefore, when encountering excessive impact force or poor impact angle, the lever 920 will compress the elastic element 930, causing the lever 920 to move away from the lever base 910, thereby reducing hard impact, reducing damage to parts caused by impact, and extending the service life of parts.

[0043] Preferably, the toggle block 920 is hinged to the toggle block base 910, the elastic member 930 is used to rotate the toggle block 920 away from the toggle block base 910, and the pressure block 940 is used to restrict the rotation of the toggle block 920 away from the toggle block base 910. This improves the reliability of the toggle block 920's movement.

[0044] Preferably, one end of the lever 920 is hinged to the lever base 910, and the pressure block 940 is in contact with the other end of the lever 920.

[0045] Preferably, the other end of the push block 920 extends to a first step portion, and the pressing block 940 extends to a second step portion that cooperates with the first step portion, wherein the step surface of the first step portion and the step surface of the second step portion cooperate.

[0046] The elastic element 930 is preferably a spring.

[0047] The toggle base 910 includes a toggle support 911 mounted on the support ring 100, a slide 912 disposed on the toggle support 911 and movable radially relative to the toggle support 911 along the support ring 100, and fasteners for detachably mounting the slide 912 on the toggle support 911. The toggle 920 is movably connected to the slide 912, and the pressure block 940 is mounted on the slide 912. This simplifies the structure and facilitates adjustment of the position of the toggle 920.

[0048] The feed drive assembly 700 includes a feed support 710 mounted on the slide assembly 500, a gear shaft 720 rotatably mounted on the feed support 710, a feed shaft 730 rotatably mounted on the feed support 710, and a feed gear 740 mounted on the feed shaft 730. The feed gear 740 meshes with the gear shaft 720. A ratchet module 800 is mounted on the gear shaft 720, and the feed shaft 730 is threadedly connected to the tool holder 600. Thus, by rotating the ratchet module 800, the gear shaft 720 can be driven to rotate, thereby driving the feed gear 740 and the feed shaft 730 to rotate, and ultimately driving the tool holder 600 to slide and feed the tool.

[0049] Preferably, the ratchet module 800 includes two connected ratchet wheels 810 and 820, with different numbers of teeth on the first ratchet wheel 810 and the second ratchet wheel 820. There are two lever blocks 920, namely a first lever block 921 and a second lever block 922. There are two elastic elements 930. The two lever blocks 920 are arranged side-by-side along the radial direction of the support ring 100, with one elastic element 930 corresponding to one lever block 920. The pressure block 940 causes the two lever blocks 920 to move away from the lever block base 910. The ratchet module 800 can slide axially along the gear shaft 720. The ratchet module 800 has... In the first and second positions, when the ratchet module 800 is in the first position, the first ratchet 810 can engage with the first lever 921, and the second ratchet 820 does not engage with the second lever 922. When the ratchet module 800 is in the second position, the second ratchet 820 can engage with the second lever 922, and the first ratchet 810 does not engage with the first lever 921. Thus, when the ratchet module 800 is in the first position, the tool on the tool holder 600 can be driven to feed with a first feed amount. When the ratchet module 800 is in the second position, the tool on the tool holder 600 can be driven to feed with a second feed amount. This allows the tool to have two different feed speeds.

[0050] Preferably, a groove is provided on the surface of the ratchet module 800 that contacts the gear shaft 720. Two sets of balls and a spring are axially arranged on the gear shaft 720. The spring causes the balls to protrude from the outer surface of the gear shaft 720. The balls cooperate with the groove to limit the axial movement of the ratchet module 800 along the gear shaft 720. An external force can be used to push the ratchet module 800 to slide relative to the gear shaft 720. When the balls engage with the groove, a slightly larger force is required to continue sliding the ratchet module 800 relative to the gear shaft 720. This achieves both sliding and limiting of the ratchet module 800.

[0051] The support ring 100 and the movable ring 300 are rotatably connected by rollers 160.

[0052] Specifically, the support ring 100 has an annular groove 150, and a plurality of rollers 160 are arranged circumferentially within the groove 150. The rollers 160 are rotatably connected to the support ring 100, and the movable ring 300 is disposed within the groove 150 and is rotatably connected to the rollers 160.

[0053] The rotary drive assembly 400 includes a motor, a motor mount 420, a gearbox 430, a motor connecting shaft 440, a small bevel gear 450, a large bevel gear 460, a drive shaft 470, a drive pinion 481, a drive large gear 482, and a driven gear shaft 490. The gearbox 430 is mounted on the support ring 100, the motor mount 420 is mounted on the gearbox 430, the motor is mounted on the motor mount 420, the motor connecting shaft 440 is connected to the output end of the motor, and the small bevel gear 450 is mounted on the motor connecting shaft 440. The drive shaft 470 is rotatably mounted on the gearbox 430. The large bevel gear 460 is mounted on the drive shaft 470 and meshes with the small bevel gear 450. The drive pinion 481 is mounted on the drive shaft 470. The driven gear shaft 490 is rotatably mounted on the gearbox 430. The drive large gear 482 is mounted on the driven gear shaft 490, and the drive pinion 481 and the drive large gear 482 mesh. The outer side of the movable ring 300 is provided with teeth that mesh with the driven gear shaft 490. Thus, the motor drives the motor connecting shaft 440 to rotate, which in turn drives the small bevel gear 450, then the large bevel gear 460, then the drive shaft 470, which in turn drives the drive pinion 481, then the drive large gear 482, then the driven gear shaft 490, and finally the movable ring 300.

[0054] In this embodiment, the movable ring 300 includes a first movable half-ring 310, a second movable half-ring 320, a movable pin 330, and a movable fastener 340. The first movable half-ring 310 and the second movable half-ring 320 are joined together and fixed by the movable pin 330 and the movable fastener 340. This facilitates the installation and disassembly of the portable pipe ring cutting and beveling machine.

[0055] The support ring 100 includes a first support half-ring 110, a second support half-ring 120, a support pin 130, and a support fastener 140. The first support half-ring 110 and the second support half-ring 120 are spliced ​​together and fixed by the support pin 130 and the support fastener 140. This facilitates the installation and disassembly of the portable pipe ring cutting and beveling machine.

[0056] In this embodiment, the working process of the portable pipe annular cutting and beveling machine is as follows:

[0057] The rotary drive assembly 400 drives the movable ring 300 to rotate relative to the support ring 100. The movable ring 300 drives the slide assembly 500 to rotate, the slide assembly 500 drives the tool holder 600 to rotate, and the tool holder 600 drives the tool to rotate, thereby realizing cutting. When the movable ring 300 rotates to the point where the ratchet module 800 and the lever block 920 are in contact, the ratchet module 800 rotates, driving the feed transmission assembly 700 to move. The feed transmission assembly 700 drives the tool holder 600 to slide and realize the feed. In this way, the tool feeds once for each rotation until the beveling or cutting is completed.

[0058] The above description is only a description of the preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A portable pipe annular cutting and beveling machine, comprising a support ring, a clamping and limiting assembly mounted on the support ring for clamping a pipe, a movable ring rotatably connected to the support ring, a rotary drive assembly for driving the movable ring to rotate relative to the support ring, a slide assembly mounted on the movable ring, a tool holder slidably connected to the slide assembly and movable radially relative to the slide assembly along the support ring, a feed transmission assembly mounted on the slide assembly for driving the tool holder to move, and a ratchet module mounted on the input shaft of the feed transmission assembly, characterized in that... It also includes a paddle base mounted on the support ring, a paddle movably connected to the paddle base, an elastic element for moving the paddle away from the paddle base, and a pressure block mounted on the paddle base for restricting the movement of the paddle away from the paddle base; wherein the paddle can cooperate with the ratchet module.

2. The portable pipe ring cutting and beveling machine as described in claim 1, characterized in that, The lever is hinged to the lever base, the elastic element is used to rotate the lever away from the lever base, and the pressure block is used to restrict the lever from rotating away from the lever base.

3. The portable pipe annular cutting and beveling machine as described in claim 2, characterized in that, One end of the lever is hinged to the lever base, and the pressure block is in contact with the other end of the lever.

4. The portable pipe annular cutting and beveling machine as described in claim 3, characterized in that, The other end of the push block extends to a first step portion, and the pressure block extends to a second step portion that mates with the first step portion, with the step surfaces of the first step portion and the second step portion mate with each other.

5. The portable pipe annular cutting and beveling machine as described in claim 1, characterized in that, The elastic element is a spring.

6. The portable pipe annular cutting and beveling machine as described in claim 1, characterized in that, The paddle base includes a paddle support mounted on the support ring, a slide mounted on the paddle support that is radially movable relative to the paddle support along the support ring, and a fastener for detachably mounting the slide on the paddle support. The paddle is movably connected to the slide, and the pressure block is mounted on the slide.

7. The portable pipe annular cutting and beveling machine as described in claim 1, characterized in that, The feed transmission assembly includes a feed support mounted on the slide assembly, a gear shaft rotatably mounted on the feed support, a feed shaft rotatably mounted on the feed support, and a feed gear mounted on the feed shaft. The feed gear meshes with the gear shaft, a ratchet module is mounted on the gear shaft, and the feed shaft is threadedly connected to the tool holder.

8. The portable pipe annular cutting and beveling machine as described in claim 7, characterized in that, The ratchet module includes two connected ratchet wheels, a first ratchet and a second ratchet, with different numbers of teeth. There are two levers, a first lever and a second lever. There are also two elastic elements. The two levers are arranged side-by-side along the radial direction of the support ring, with one elastic element corresponding to one lever. The pressure block causes the two levers to move away from the lever base. The ratchet module can slide axially along the gear shaft. The ratchet module has a first position and a second position. When the ratchet module is in the first position, the first ratchet engages with the first lever, and the second ratchet does not engage with the second lever. When the ratchet module is in the second position, the second ratchet engages with the second lever, and the first ratchet does not engage with the first lever.

9. The portable pipe annular cutting and beveling machine as described in claim 8, characterized in that, The ratchet module has a groove on the side that contacts the gear shaft. Two sets of balls and springs are arranged axially on the gear shaft. The springs cause the balls to protrude from the outer surface of the gear shaft. The balls cooperate with the groove to restrict the ratchet module from moving axially along the gear shaft.

10. The portable pipe annular cutting and beveling machine as described in claim 1, characterized in that, The movable ring includes a first movable half-ring, a second movable half-ring, a movable pin, and a movable fastener. The first movable half-ring and the second movable half-ring are spliced ​​together and fixed by the movable pin and the movable fastener. The support ring includes a first support half-ring, a second support half-ring, a support pin, and a support fastener. The first support half-ring and the second support half-ring are spliced ​​together and fixed by the support pin and the support fastener.

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