End face chamfering machine for hardware pipe fitting machining

Abstract

The invention relates to the technical field of pipe fitting chamfering, and discloses an end face chamfering machine for hardware pipe fitting machining, the end face chamfering machine comprises a chamfering part, the chamfering part comprises a workbench, the workbench is slidably connected with a chamfering tool and a placing part through a sliding rail arranged on the upper surface of the workbench, the chamfering tool can be used for chamfering an external three-way pipe, and the placing part comprises a machine base; the bottom of the machine base is fixedly connected with the upper surface of the workbench, and the interior of the machine base is rotationally connected with a containing piece used for fixing an external three-way pipe. The end face chamfering machine for hardware pipe fitting machining can effectively solve the problems that in the prior art, a three-way pipe is firstly fixed to a proper clamp or workbench to ensure that the three-way pipe cannot move in the machining process, then a special chamfering tool machines the three-way pipe according to the preset angle and depth, and due to the fact that the hardware three-way pipe is provided with three connectors, the machining efficiency is greatly improved. Therefore, the positioning angle of the three-way pipe needs to be adjusted for multiple times, so that three connectors are chamfered in sequence, and the overall machining automation degree is low.

Description

Technical Field

[0001] The invention relates to the technical field of pipe chamfering, and in particular to an end face chamfering machine for processing hardware pipe fittings. Background Art

[0002] A hardware tee is a hardware accessory used for pipe connection. It has three interfaces that allow three pipes to meet or branch at one point. Hardware tees are widely used in pipeline systems in construction, water supply and drainage, HVAC, petrochemical, electric power and other industries.

[0003] Chamfering the interface of the hardware tee can reduce the stress concentration caused by the sharp angle, thereby improving the pressure resistance of the tee and preventing the pipe from rupturing when under pressure. At the same time, chamfering can make the connection part of the pipe smoother, which is convenient for the insertion and connection of the pipe, especially in the tee with threaded connection, chamfering helps the smooth screwing of the thread. First, fix the tee on an appropriate fixture or workbench to ensure that it will not move during the processing. Then, a special chamfering tool is used to process according to the predetermined angle and depth. Since the hardware tee has three interfaces, the tee needs to adjust the positioning angle many times to facilitate the chamfering of the three interfaces in turn, and the overall processing automation is low. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides an end chamfering machine for processing hardware pipe fittings, which can effectively solve the problem in the prior art that the tee pipe is first fixed on an appropriate fixture or workbench to ensure that it will not move during the processing, and then a special chamfering tool is used to process according to a predetermined angle and depth. Since the hardware tee pipe has three interfaces, the tee pipe needs to adjust the positioning angle multiple times to facilitate the chamfering of the three interfaces in sequence, resulting in a low degree of overall processing automation.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] The present invention provides an end face chamfering machine for processing hardware pipe fittings, comprising:

[0007] A chamfering part, the chamfering part comprises a workbench, the workbench is slidably connected to a chamfering tool for chamfering an external tee pipe via a slide rail arranged on an upper surface thereof;

[0008] A placement part, the placement part includes a machine base, the bottom of the machine base is fixedly connected to the upper surface of the workbench, and the inside of the machine base is rotatably connected to a placement piece that can be used to fix the external three-way pipe;

[0009] Among them, the main body of the placement piece adopts a detachable structure, and the placement piece includes a rotating mold and a counterweight mold. The rotating mold is rotatably connected to the inside of the machine base through a rotating shaft arranged on its outer surface, and the outer end of the rotating shaft is transmission-connected to the output end of the external driving unit. The counterweight mold is fixedly connected to a side close to the machine base with a limiting slide rod that slides with the inside of the rotating mold.

[0010] Furthermore, it also includes a positioning part, which includes a guide rail seat, the bottom of which is fixedly connected to the upper surface of the workbench, the upper surface of which is slidably connected with a positioning block, and the end face of the positioning block is provided with a quadrangular pyramidal hole, and the end of the rotating shaft away from the external driving unit is fixedly connected with a quadrangular pyramidal rod that engages with the inner wall of the quadrangular pyramidal hole.

[0011] Furthermore, a U-shaped groove which fits with the external three-way pipe is provided inside the rotating mold, and the central axis of the U-shaped groove coincides with the central axis of the chamfering tool, and a through hole which communicates with the inside of the U-shaped groove is provided inside the counterweight mold.

[0012] Furthermore, the rotating die is fixedly connected to an ear block on one side close to the chamfering tool, and the counterweight die is slidably connected to a positioning rod that fits in the inner hole of the ear block through a built-in cavity opened therein, and a micro spring connected to the inside of the counterweight die is provided at one end of the positioning rod away from the ear block.

[0013] Furthermore, a clamping rod that fits the outer surface of the external three-way pipe is fixedly connected to the lower surface of the counterweight mold, and the clamping rod is located on the side of the external three-way pipe away from the chamfering tool, and the bottom end of the through hole adopts an arc design.

[0014] Furthermore, a built-in groove connected to the inside of the U-shaped groove is opened inside the rotating mold, and the built-in groove is connected to a limit plate that fits with the outer surface of the external three-way pipe through a driven gear arranged inside it, and the limit plate is located on the side of the clamping rod away from the chamfering tool, and the outer surface of the circular outer surface of the end face rotating rod of the driven gear is sleeved with a torsion spring connected to the inside of the rotating mold.

[0015] Furthermore, the inner wall of the built-in groove is rotatably connected with a driving gear meshing with the driven gear, the interior of the rotating mold is slidably connected with a tooth plate meshing with the driving gear, the rotating mold is slidably connected with a counterweight block on the side away from the ear block, the circumferential outer surface of the counterweight block is connected to the end face of the tooth plate through a traction rope, the circumferential outer surface of the traction rope is sleeved with a return spring connected to the tooth plate, and the adjacent ends of a pair of limit plates are magnetically connected.

[0016] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0017] The present invention is provided with a rotating mold and a counterweight mold. When the rotating mold, the counterweight mold and the three-way pipe rotate 90 degrees clockwise, the positioning rod is always engaged in the ear block under the action of gravity. Then, the slide rail drives the chamfering tool to move forward slowly to achieve the chamfering of the main pipe interface of the three-way pipe; when the rotating mold, the counterweight mold and the three-way pipe rotate 180 degrees clockwise, the positioning rod is always engaged in the ear block under the action of gravity, thereby avoiding the separation of the counterweight mold and the rotating mold, and the slide rail drives the chamfering tool to move forward slowly to achieve the chamfering of another branch pipe interface of the three-way pipe. Through the intermittent rotation of the rotating mold and the counterweight mold, the switching of the "mouth to be chamfered" is realized, and the three pipe mouths are quickly chamfered, eliminating the trouble of repeatedly positioning the three-way pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the present invention;

[0020] Figure 2 It is a schematic diagram of a three-dimensional multi-angle structure of an embodiment of the present invention;

[0021] Figure 3 For the embodiment of the present invention Figure 2 A schematic diagram of the structure with a partial enlargement at the center;

[0022] Figure 4 This is a schematic diagram of the three-dimensional structure of the placement piece according to an embodiment of the present invention rotated 120 degrees counterclockwise;

[0023] Figure 5 This is a schematic diagram of a three-dimensional multi-angle structure of a placement piece rotated 120 degrees counterclockwise according to an embodiment of the present invention;

[0024] Figure 6 It is a structural schematic diagram of an initial three-dimensional partial cross-section of a placement piece according to an embodiment of the present invention;

[0025] Figure 7 It is a structural schematic diagram of the three-dimensional state transformation of the placement piece and the three-way pipe in an embodiment of the present invention;

[0026] Figure 8 This is a schematic diagram of the structure of the three-dimensional separation of the placement parts according to an embodiment of the present invention;

[0027] Fig. 9 For the embodiment of the present invention Figure 8Schematic diagram of the structure with a partial enlargement at point B in the middle.

[0028] The numbers in the figure represent respectively: 1. chamfering part; 11. workbench; 12. slide rail; 13. chamfering tool; 2. placement part; 21. machine base; 22. placement piece; 221. rotating mold; 2211. U-shaped groove; 2212. ear block; 2213. built-in groove; 2214. driven gear; 2215. limit plate; 2216. torsion spring; 2217. driving gear; 2218. tooth plate; 2219. counterweight block; 222. counterweight mold; 2221. through hole; 2210. traction rope; 2222. built-in cavity; 2223. positioning rod; 2224. micro spring; 2225. tightening rod; 223. limiting slide rod; 3. positioning part; 31. guide rail seat; 32. positioning block; 33. quadrangular pyramid hole; 34. quadrangular pyramid rod. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The present invention will be further described below in conjunction with the embodiments.

[0031] Example:

[0032] See also Figure 1-Figure 9 The present invention provides a technical solution: an end face chamfering machine for processing hardware pipe fittings, comprising:

[0033] The chamfering part 1 comprises a workbench 11, and the workbench 11 is slidably connected to a chamfering tool 13 for chamfering an external tee pipe via a slide rail 12 arranged on its upper surface;

[0034] The placing part 2 includes a base 21, the bottom of the base 21 is fixedly connected to the upper surface of the workbench 11, and the inside of the base 21 is rotatably connected to a placing piece 22 that can be used to fix an external three-way pipe;

[0035] Among them, the main body of the placement piece 22 adopts a detachable structure, and the placement piece 22 includes a rotating mold 221 and a counterweight mold 222. The rotating mold 221 is rotatably connected to the inside of the machine base 21 through a rotating shaft arranged on its outer surface, and the outer end of the rotating shaft is transmission-connected to the output end of the external driving unit. The counterweight mold 222 is fixedly connected to the side of the machine base 21 with a limiting slide rod 223 that slides with the inside of the rotating mold 221.

[0036] The positioning part 3 also includes a positioning part 3, which includes a guide rail seat 31. The bottom of the guide rail seat 31 is fixedly connected to the upper surface of the workbench 11. The upper surface of the guide rail seat 31 is slidably connected with a positioning block 32, and the end surface of the positioning block 32 is provided with a quadrangular pyramid hole 33. The end of the rotating shaft away from the external driving unit is fixedly connected with a quadrangular pyramid rod 34 engaged with the inner wall of the quadrangular pyramid hole 33. The output end of the external driving unit drives the rotating mold 221 and the counterweight mold 222 to rotate intermittently to complete the pipe opening switching of the three-way pipe. However, it is necessary to ensure that the center axis of the pipe mouth after each rotation coincides with the center axis of the chamfering tool 13. To this end, the reciprocating left and right movement of the positioning block 32 and the cooperation of the quadrangular pyramid hole 33 and the quadrangular pyramid rod 34 are utilized to achieve accurate calibration of the pipe mouth after each rotation. Secondly, it can also meet the needs of double-station use. Thirdly, after the quadrangular pyramid rod 34 is inserted into the quadrangular pyramid hole 33, the overall stability of the placement piece 22 can be improved to prevent the placement piece 22 from undergoing slight angular rotation changes during subsequent chamfering processes.

[0037] The rotating mold 221 has a U-shaped groove 2211 inside that fits with the external three-way pipe, and the central axis of the U-shaped groove 2211 coincides with the central axis of the chamfering tool 13 . The counterweight mold 222 has a through hole 2221 inside that communicates with the interior of the U-shaped groove 2211 .

[0038] The rotating mold 221 is fixedly connected to the side close to the chamfering tool 13 with an ear block 2212, and the counterweight mold 222 is slidably connected to a positioning rod 2223 that fits in the inner hole of the ear block 2212 through a built-in cavity 2222 opened therein. The positioning rod 2223 is provided with a micro spring 2224 connected to the inside of the counterweight mold 222 at one end away from the ear block 2212.

[0039] The lower surface of the counterweight mold 222 is fixedly connected with a clamping rod 2225 that fits the outer surface of the external three-way pipe. The clamping rod 2225 is located on the side of the external three-way pipe away from the chamfering tool 13, and the bottom end of the through hole 2221 adopts an arc design.

[0040] The interior of the rotating mold 221 is provided with a built-in groove 2213 which is connected to the interior of the U-shaped groove 2211. The built-in groove 2213 is connected to a limit plate 2215 which fits the outer surface of the external three-way pipe through a driven gear 2214 arranged inside it, and the limit plate 2215 is located on the side of the clamping rod 2225 away from the chamfering tool 13. The outer surface of the circumference of the end face rotating rod of the driven gear 2214 is provided with a torsion spring 2216 which is connected to the interior of the rotating mold 221.

[0041] The inner wall of the built-in groove 2213 is rotatably connected with a driving gear 2217 meshing with the driven gear 2214, the interior of the rotating mold 221 is slidably connected with a tooth plate 2218 meshing with the driving gear 2217, the rotating mold 221 is slidably connected with a counterweight block 2219 on the side away from the ear block 2212, the circumferential outer surface of the counterweight block 2219 is connected to the end face of the tooth plate 2218 through a traction rope 2210, the circumferential outer surface of the traction rope 2210 is sleeved with a return spring connected to the tooth plate 2218, and the adjacent ends of a pair of limit plates 2215 are magnetically connected.

[0042] refer to Figure 1-Figure 9 Regarding the chamfering method of the tee pipe, the tee pipe is generally fixed on a suitable fixture or workbench to ensure that it will not move during the processing. Then, a special chamfering tool is used to process it according to the predetermined angle and depth. Since the hardware tee pipe has three interfaces, the positioning angle of the tee pipe needs to be adjusted many times so that the three interfaces can be chamfered in sequence. The overall processing automation level is low;

[0043] In order to overcome the above-mentioned defects, the present application designs an end face chamfering machine for processing hardware pipe fittings, which can realize sequential chamfering of the pipe ends of the tee pipe without stopping the machine.

[0044] Tee pipe feeding process:

[0045] The main body of the placement member 22 of the present invention adopts a detachable structure. Initially, the rotating mold 221 and the counterweight mold 222 are in a vertical state. When the placement member 22 needs to load the tee pipe, the output end of the external driving unit drives the placement member 22 to rotate 120 degrees counterclockwise as a whole, and the rotating mold 221 rotates with the help of the rotating shaft and the inside of the machine base 21. During the rotation of the placement member 22 from the vertical state to the horizontal state, the counterweight mold 222 is always tightly fitted with the rotating mold 221 under the action of gravity; during the rotation of the placement member 22 from the horizontal state to 120 degrees, the counterweight mold 222 begins to gradually separate from the rotating mold 221 under the action of gravity, and the counterweight mold 222 slides outward along the inside of the rotating mold 221 with the help of the limiting slide bar 223, and the two are separated. Next, the three-way pipe is placed in the U-shaped groove 2211 of the rotating mold 221 by manual picking or mechanical picking. At the same time, the bottom of the three-way pipe is limited by the clamping rod 2225, so that the three-way pipe is placed stably. Next, the output end of the external driving unit drives the placement piece 22 to rotate 120 degrees clockwise as a whole to reset. Under the action of gravity, the counterweight mold 222 begins to approach the rotating mold 221. The counterweight mold 222 drives the clamping rod 2225 to slide along the outer surface of the tee, so that the main pipeline interface of the tee can slide accurately into the through hole 2221 (the bottom end of the through hole 2221 adopts an arc design). Finally, the rotating mold 221 and the counterweight mold 222 are in a vertical state. Under the action of gravity of the counterweight mold 222, the two are tightly fitted, and the clamping rod 2225 is tightly pressed against the outer surface of the tee, so that the tee can achieve automatic positioning and locking. The main pipeline interface of the tee faces upward, and the branch pipeline interface (or branch inlet) of the tee is in a horizontal state, and two are provided for diversion.

[0046] Tee pipe chamfer switching process:

[0047] From the above, it can be seen that the separation and closing of the rotating mold 221 and the counterweight mold 222 are realized through the reciprocating rotation of the placement piece 22, which is used for the loading and rapid positioning and locking of the three-way pipe. However, the positioning and locking of the three-way pipe relies on the gravity of the counterweight mold 222. In the subsequent chamfering process of the chamfering tool 13, the three-way pipe will be driven to vibrate up and down for a short distance, thereby affecting the processing accuracy of the three-way pipe. In this regard, the present invention is also provided with a positioning rod 2223, a micro spring 2224 and an ear block 2212. During the rotation of the counterweight mold 222 from the reverse direction of 120 degrees to the vertical state, the positioning rod 2223 is always hidden in the built-in cavity 2222 under the action of its own gravity. When the rotating mold 221 and the counterweight mold 222 have not yet completely rotated to the vertical state, the rotating mold 221 and the counterweight mold 222 have already completed a tight fit. After reaching the vertical state, under the elastic force of the micro spring 2224, the positioning rod 2223 is driven to slide outward along the inner wall of the built-in cavity 2222 until the positioning rod 2223 is stuck in the ear block 2212, completing the automatic locking of the rotating mold 221 and the counterweight mold 222, and the two are combined into a whole.

[0048] Then, the slide rail 12 drives the chamfering tool 13 to move forward slowly to achieve the chamfering of a branch pipe interface of the tee pipe; since the central axis of the main pipe interface is perpendicular to the central axis of the branch pipe interface, and the intersection of the two is located on the central axis of the rotating shaft of the rotating mold 221, during the intermittent rotation of the tee pipe driven by the rotating mold 221 and the counterweight mold 222, after each 90-degree interval, the central axis of the pipe opening facing the chamfering tool 13 always coincides. Figure 7 It can be seen that when the rotating mold 221, the counterweight mold 222 and the three-way pipe rotate 90 degrees clockwise, the positioning rod 2223 is always engaged in the ear block 2212 under the action of gravity, and then the slide rail 12 drives the chamfering tool 13 to move forward slowly to achieve the chamfering of the main pipe interface of the three-way pipe; when the rotating mold 221, the counterweight mold 222 and the three-way pipe rotate 180 degrees clockwise, the positioning rod 2223 is always engaged in the ear block 2212 under the action of gravity, thereby avoiding the separation of the counterweight mold 222 and the rotating mold 221, and the slide rail 12 drives the chamfering tool 13 to move forward slowly to achieve the chamfering of another branch pipe interface of the three-way pipe. Through the intermittent rotation of the rotating mold 221 and the counterweight mold 222, the switching of the "mouth to be chamfered" is realized, and the three pipe mouths are quickly chamfered, eliminating the trouble of repeatedly positioning the three-way pipe.

[0049] Tee pipe cutting process:

[0050] As can be seen from the above, after the three-way pipe is chamfered in turn, the rotating mold 221 and the counterweight mold 222 drive the three-way pipe to reset to the vertical state. Then, the output end of the external driving unit drives the placement piece 22 to rotate 120 degrees counterclockwise as a whole. During the rotation of the placement piece 22 from the vertical state to the horizontal state, the counterweight mold 222 is under the action of gravity, and the counterweight mold 222 and the rotating mold 221 are always tightly fitted. At this time, the positioning rod 2223 begins to hide in the built-in cavity 2222 under the action of its own gravity. During the rotation of the placement piece 22 from the horizontal state to 120 degrees, the counterweight mold 222 begins to gradually separate from the rotating mold 221 under the action of gravity. The counterweight mold 222 slides outward along the inside of the rotating mold 221 with the help of the limiting slide bar 223, and the two are separated. Then, the unloading and loading operations of the three-way pipe are carried out. It should be emphasized that when the counterweight mold 222 begins to gradually separate from the rotating mold 221, the three-way pipe will slide downward synchronously with the counterweight mold 222 under the action of gravity. The main pipeline interface of the three-way pipe is engaged in the through hole 2221, which makes it inconvenient to quickly remove the chamfered three-way pipe. In this regard, the present invention is also provided with a driven gear 2214, a limit plate 2215, a torsion spring 2216, a driving gear 2217, a tooth plate 2218, a counterweight block 2219 and a traction rope 2210.

[0051] Specifically, when the rotating mold 221 and the counterweight mold 222 rotate from a vertical state to a horizontal state, the two have not yet separated. At this time, the counterweight block 2219, under the action of its own gravity, drives the counterweight block 2219 to slide outward along the inside of the rotating mold 221, and drives the two sets of tooth plates 2218 to approach each other through the traction rope 2210, thereby driving the active gear 2217 and the driven gear 2214 to engage and rotate, and drives the two sets of limit plates 2215 to rotate towards each other until the adjacent ends of the two sets of limit plates 2215 are close to each other and are quickly attracted together under the action of magnetic force. At this time, the two sets of limit plates 2215 are combined into a complete "semi-circular ring" and fit tightly on the outer surface of the three-way pipe to avoid sliding downward synchronously with the counterweight mold 222. The main pipeline interface of the three-way pipe is separated from the through hole 2221, which is convenient for the quick removal of the chamfered three-way pipe and the quick placement of the three-way pipe to be processed later.

[0052] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. An end chamfering machine for processing hardware pipe fittings, characterized in that: include: A chamfering portion (1), the chamfering portion (1) comprising a workbench (11), the workbench (11) being slidably connected to a chamfering tool (13) for chamfering an external tee pipe via a slide rail (12) arranged on its upper surface; A placement portion (2), the placement portion (2) comprising a machine base (21), the bottom of the machine base (21) being fixedly connected to the upper surface of the workbench (11), and a placement piece (22) which can be used to fix an external three-way pipe is rotatably connected inside the machine base (21); The main body of the placement member (22) adopts a detachable structure. The placement member (22) comprises a rotating mold (221) and a counterweight mold (222). The rotating mold (221) is rotatably connected to the inside of the machine base (21) via a rotating shaft arranged on its outer surface, and the outer end of the rotating shaft is transmission-connected to the output end of the external driving unit. The counterweight mold (222) is fixedly connected to a side close to the machine base (21) with a limiting slide rod (223) that slides with the inside of the rotating mold (221).

2. The end chamfering machine for metal pipe processing according to claim 1, characterized in that: The invention also comprises a positioning part (3), wherein the positioning part (3) comprises a guide rail seat (31), the bottom of the guide rail seat (31) is fixedly connected to the upper surface of the workbench (11), a positioning block (32) is slidably connected to the upper surface of the guide rail seat (31), and a quadrangular pyramid hole (33) is formed on the end surface of the positioning block (32), and a quadrangular pyramid rod (34) engaged with the inner wall of the quadrangular pyramid hole (33) is fixedly connected to the end of the rotating shaft away from the external driving unit.

3. The end chamfering machine for metal pipe processing according to claim 1, characterized in that: The interior of the rotating mold (221) is provided with a U-shaped groove (2211) which fits with the external three-way pipe, and the central axis of the U-shaped groove (2211) coincides with the central axis of the chamfering tool (13), and the interior of the counterweight mold (222) is provided with a through hole (2221) which is connected with the interior of the U-shaped groove (2211).

4. The end chamfering machine for processing metal pipe fittings according to claim 1, characterized in that: The rotating die (221) is fixedly connected to an ear block (2212) on one side close to the chamfering tool (13); the counterweight die (222) is slidably connected to a positioning rod (2223) that fits in the inner hole of the ear block (2212) through a built-in cavity (2222) provided therein; and the positioning rod (2223) is provided with a micro spring (2224) connected to the inside of the counterweight die (222) at one end away from the ear block (2212).

5. The end chamfering machine for processing metal pipe fittings according to claim 3, characterized in that: The lower surface of the counterweight mold (222) is fixedly connected with a clamping rod (2225) that fits the outer surface of the external three-way pipe. The clamping rod (2225) is located on the side of the external three-way pipe away from the chamfering tool (13). The bottom end of the through hole (2221) adopts an arc design.

6. The end chamfering machine for processing metal pipe fittings according to claim 4, characterized in that: The interior of the rotating die (221) is provided with an internal groove (2213) which is in communication with the interior of the U-shaped groove (2211); the internal groove (2213) is connected to a limit plate (2215) which is in contact with the outer surface of the external three-way pipe via a driven gear (2214) arranged therein; the limit plate (2215) is located on the side of the clamping rod (2225) away from the chamfering tool (13); and the outer surface of the circumference of the end face rotating rod of the driven gear (2214) is sleeved with a torsion spring (2216) which is connected to the interior of the rotating die (221).

7. The end chamfering machine for processing metal pipe fittings according to claim 6, characterized in that: The inner wall of the built-in groove (2213) is rotatably connected to a driving gear (2217) meshing with a driven gear (2214); the interior of the rotating mold (221) is slidably connected to a toothed plate (2218) meshing with the driving gear (2217); a counterweight block (2219) is slidably connected to the side of the rotating mold (221) away from the ear block (2212); the circumferential outer surface of the counterweight block (2219) is connected to the end surface of the toothed plate (2218) through a traction rope (2210); a return spring connected to the toothed plate (2218) is sleeved on the circumferential outer surface of the traction rope (2210); and adjacent ends of a pair of limit plates (2215) are magnetically connected.

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