A chamfering device for external thread bead

Abstract

This utility model relates to the field of glue gun manufacturing technology, and discloses an external thread ring chamfering device. The material handling station is equipped with a feeding device for conveying external thread rings and a material handling mechanism for receiving external thread rings output by the feeding device and conveying them to a buffer station. A positioning mechanism is provided on the processing station. A feeding mechanism is provided on one side of the buffer station for pushing the external thread rings on the buffer station into the positioning mechanism to horizontally position them. A chamfering mechanism is provided on one side of the processing station for chamfering the inner ring of the external thread ring opening within the positioning mechanism. An unloading mechanism is provided on the positioning mechanism, and an unloading port is provided on the buffer station. This chamfering device can complete the feeding, gripping, buffering, chamfering, and unloading operations of external thread rings, operating automatically throughout the process without manual intervention, effectively improving work efficiency and ensuring safety.

Description

Technical Field

[0001] This utility model relates to the field of glue gun manufacturing technology, and in particular to a chamfering device for an external threaded bezel. Background Technology

[0002] Utility model patent CN215918066U discloses a structural glue gun with a conveniently detachable glue gun head, comprising: a handle, a push rod, a glue gun barrel, and a glue gun head. The push rod is slidably disposed within the glue gun barrel. The handle is connected to the glue gun barrel and is used to move the push rod axially along the glue gun barrel when pressed. The glue gun barrel is detachably connected to the glue gun head via a quick-connect clamp.

[0003] like Figure 1 and Figure 2 The diagrams shown illustrate the connection structure between the glue gun barrel and the quick-connect clamp in the prior art, as well as the connection structure between the external threaded ring and the glue gun barrel. The main components include the glue gun barrel body and quick-connect clamps threaded onto both ends of the glue gun barrel body. Specifically, the outer circumferential surface of the glue gun barrel body has an external thread near the end, and the cover surface of the quick-connect clamp has an internal threaded sleeve threaded onto the external thread. The external thread is integrated into the outer circumferential surface of a ring, which is fitted onto the glue gun barrel. Because the end of the glue gun barrel has a slight diameter change and the outer diameter increases from the outside to the inside along the length of the glue gun barrel, the external threaded ring fitted onto the glue gun barrel can engage near the end and cannot move further inward. To prevent the external threaded ring from detaching from the glue gun barrel, the end of the glue gun barrel is usually stamped to form an outwardly flared opening. To improve the tightness and fit between the flared opening and the external threaded ring, a chamfer is usually beveled inside the opening of the external threaded ring.

[0004] However, in actual processing, the chamfering process is usually completed by a chamfering machine. During use, manual loading and unloading is required, which is not only inefficient but also poses certain safety risks. Therefore, it needs to be improved. Utility Model Content

[0005] This utility model addresses the shortcomings of existing technologies by providing an external thread bezel chamfering device, which can automatically feed external thread bezel blanks and perform inner ring chamfering, thereby improving work efficiency and safety.

[0006] To solve the above-mentioned technical problems, the present invention provides a solution through the following technical method: A chamfering device for external threaded rings includes a worktable with a material picking station, a buffer station, and a processing station arranged sequentially on the worktable. The material picking station is equipped with a feeding device for sequentially conveying multiple external threaded rings and a material picking mechanism for receiving a single external threaded ring output by the feeding device and conveying the external threaded ring to the buffer station. The processing station is equipped with a positioning mechanism. A feeding mechanism is provided on one side of the buffer station for pushing the external threaded ring on the buffer station into the positioning mechanism to perform horizontal positioning of the external threaded ring. A chamfering mechanism is provided on one side of the processing station for chamfering the inner ring of the external threaded ring in the positioning mechanism. The positioning mechanism is equipped with an unloading mechanism, and the buffer station has an unloading port. When the material handling mechanism enters the buffer station, the unloading port is closed; conversely, when the material handling mechanism leaves the buffer station, the unloading port is opened; when the unloading port is open, the unloading mechanism pushes the external threaded ring in the positioning mechanism into the unloading port to unload the material.

[0007] By adopting the above scheme, the chamfering device can sequentially complete the feeding, gripping, buffering, chamfering, and unloading operations of the external thread ring, operating automatically throughout the entire process without manual intervention, thereby effectively improving work efficiency and ensuring safety. Overlapping the unloading port with the buffer station effectively improves the device's compactness and reduces its space occupation, while also shortening the unloading stroke, thus improving unloading efficiency.

[0008] Preferably, the feeding device is a vibratory feeder.

[0009] Using the above solution, the vibratory feeder is an industrial device that uses vibration to automatically separate, arrange, orient, and transport objects. Its core function is to arrange disordered parts in a specific direction, remove defective products, and stably transport them to the next stage, significantly improving production efficiency.

[0010] Preferably, the material handling mechanism includes a material handling block connected to the outlet of the feeding device, a material handling groove formed on the upper surface of the material handling block for the external threaded ring of the feeding device to enter horizontally, and a power source for driving the material handling block to switch between the material handling station and the buffer station.

[0011] Using the above solution, the material picker can accurately pick up a single external thread ring output by the feeding device and transmit the external thread ring to the buffer station, thereby effectively improving the operating efficiency and accuracy of the material picker mechanism.

[0012] Preferably, a baffle is provided on the side of the feeding trough away from the buffer station. When the feeding mechanism enters the buffer station, the baffle seals the outlet of the feeding device to prevent the output of the external thread ring.

[0013] Using the above scheme, when the material handling mechanism transmits the external thread ring to the buffer station, the baffle can simultaneously seal the outlet of the feeding device, so that when the external thread ring is being chamfered, the feeding device will not output a new external thread ring blank, thereby strictly controlling the working rhythm of the chamfering device and making the chamfering device operate with higher precision.

[0014] Preferably, the workbench is provided with a second baffle for sealing the opening of the material picker away from the feeding device at the material pickering station and for opening the opening of the material picker away from the feeding device at the buffer station.

[0015] Using the above scheme, when the material handling mechanism is in the buffer station, the opening on the side of the material handling trough away from the feeding device is open, so as to facilitate the feeding mechanism to transfer the external threaded ring in the material handling trough to the processing station. When the material handling mechanism is in the material handling station, the second baffle can seal the opening on the side of the material handling trough away from the feeding device to prevent the external threaded ring received by the material handling mechanism from falling out of the material handling trough, thereby improving material handling efficiency and accuracy.

[0016] Preferably, the positioning mechanism includes a positioning seat on the workbench, a positioning groove on the upper surface of the positioning seat, and an inlet on the side of the positioning groove near the buffer station for the external thread ring to enter horizontally.

[0017] By adopting the above solution, the positioning groove on the positioning seat, together with the limiting action of the feeding mechanism, can effectively limit the horizontal position of the external thread ring at the processing station, so as to avoid the horizontal position deviation of the external thread ring during the chamfering process, thereby further improving the chamfering efficiency and accuracy of the external thread ring.

[0018] Preferably, a positioning block is provided on the side of the positioning groove away from the buffer station, and a positioning groove adapted to the outer circumferential surface of the external thread ring is provided on the side of the positioning block close to the buffer station.

[0019] By adopting the above solution, the positioning groove on the positioning block can make the external threaded ring entering the positioning mechanism fit more closely to the side wall of the positioning groove, thereby further improving the positioning effect of the positioning mechanism.

[0020] Preferably, the groove wall of the positioning groove is provided with anti-slip ridges.

[0021] By adopting the above solution, the anti-slip ridges can increase the circumferential friction between the positioning groove and the external thread ring, thereby improving the rotation limitation capability of the positioning mechanism and further enhancing the positioning effect of the positioning mechanism.

[0022] Preferably, the feeding mechanism includes a pusher block disposed on the side of the buffer station away from the processing station and a second power source disposed on the worktable to drive the pusher block to push the external threaded ring from the buffer station into the positioning mechanism and to prevent the external threaded ring from leaving the positioning mechanism.

[0023] By adopting the above solution, the feeding mechanism can accurately push the external threaded ring on the buffer station into the processing station, thereby improving the operating efficiency and accuracy of the chamfering device.

[0024] Preferably, the push block has a positioning groove 2 on the side near the buffer station that is adapted to the outer circumferential surface of the external thread ring.

[0025] By adopting the above scheme, the sidewall of the external thread ring on the buffer station and the machining station can fit more closely to the push block, further improving the driving accuracy of the push block and the stability when horizontally limiting the external thread ring.

[0026] Preferably, the chamfering mechanism includes a chamfering cutter disposed above the machining station, a drive source for driving the chamfering cutter, and a lifting mechanism disposed on the worktable to drive the drive source to rise and fall.

[0027] Using the above scheme, the drive source enables the chamfering cutter to operate, allowing for precise and efficient chamfering of the inner ring of the externally threaded bezel with its opening facing upwards. The lifting mechanism enables the chamfering cutter to move forward and backward, facilitating the entry and exit of the externally threaded bezel and ensuring the safety of the chamfering device during operation.

[0028] Preferably, the unloading mechanism includes a push plate disposed in the positioning groove and a power source for driving the push plate to perform horizontal reciprocating linear motion in the positioning groove.

[0029] By adopting the above scheme, the unloading mechanism can accurately push the finished external threaded ring into the unloading port and ensure unloading efficiency.

[0030] This utility model, by adopting the above technical solutions, has significant technical effects: the chamfering device can sequentially complete the feeding, gripping, buffering, chamfering, and unloading operations of the external thread ring, operating automatically throughout the entire process without manual intervention, thereby effectively improving work efficiency and ensuring safety. The overlapping arrangement of the unloading port and the buffer station effectively improves the compactness of the device and reduces its space occupation, while also reducing the unloading stroke, thus improving unloading efficiency. Attached Figure Description

[0031] Figure 1 This is a diagram illustrating the connection structure between the glue gun barrel and the quick-connect clamp in the existing technology. Figure 2 This is a diagram illustrating the connection structure between the external threaded bezel and the glue gun barrel in the existing technology. Figure 3 This is a schematic diagram of the structure in this embodiment, showing the material handling mechanism in the material handling position and the unloading mechanism driving the external threaded ring on the processing position into the unloading port. Figure 4 for Figure 3 An enlarged schematic diagram of part A shown; Figure 5 This is a schematic diagram of the structure when the receiving frame and the unloading port are engaged in this embodiment; Figure 6 This is a schematic diagram of the structure when the external threaded bead is in the buffer position in this embodiment; Figure 7 for Figure 6 An enlarged schematic diagram of part B is shown below; Figure 8 This is a schematic diagram of the structure of the feeding mechanism pushing the external threaded ring in the buffer station into the positioning mechanism in this embodiment; Figure 9 for Figure 8 An enlarged schematic diagram of section C is shown; Figure 10 This is a schematic diagram of the material handling mechanism in this embodiment; Figure 11 This is a schematic diagram of the feeding mechanism in this embodiment; Figure 12 This is a schematic diagram of the positioning mechanism and unloading mechanism in this embodiment; Figure 13 This is a schematic diagram of the structure of this embodiment.

[0032] The parts referred to by the numbers in the attached diagrams are as follows: 1. Workbench; 2. Material handling station; 3. Buffer station; 4. Machining station; 5. External thread ring; 6. Vibratory feeder; 7. Material handling mechanism; 8. Positioning mechanism; 9. Feeding mechanism; 10. Chamfering mechanism; 11. Unloading mechanism; 12. Unloading port; 13. Outlet; 14. Material handling block; 15. Material handling trough; 16. Power source one; 17. Partition one; 18. Partition two; 19. Positioning seat; 20. Positioning groove; 21. Inlet; 22. Positioning block; 23. Positioning... 24. Positioning Groove 1; 25. Anti-slip Texture; 26. Push Block; 27. Power Source 2; 28. Positioning Groove 2; 29. ​​Chamfering Knife; 30. Drive Source; 31. Lifting Mechanism; 32. Push Plate; 33. Power Source 3; 34. Support Plate; 35. Receiving Frame; 36. Top Opening; 37. Anti-slip Texture; 38. Guide Seat; 39. Guide Groove 1; 40. Lifting Platform; 41. Bracket; 42. Guide Groove 2; 43. Bolt; 44. Glue Gun Body; 45. Quick-connect Clamp; 46. Internal Threaded Sleeve; 47. Trumpet Mouth; 48. Angled Angle. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0034] like Figures 3 to 13As shown, this embodiment discloses an external thread beveling device, including a worktable 1, with support plates 33 fixed on both sides of the bottom of the worktable 1. The upper surface of the worktable 1 is sequentially provided with a material picking station 2, a buffer station 3, and a processing station 4. The material handling station 2 is equipped with a feeding device for sequentially conveying multiple external threaded rings 5 ​​and a material handling mechanism 7 for receiving a single external threaded ring 5 output by the feeding device and conveying the external threaded ring 5 to the buffer station 3. The processing station 4 is equipped with a positioning mechanism 8. A feeding mechanism 9 is provided on one side of the buffer station 3 for pushing the external threaded ring 5 on the buffer station 3 into the positioning mechanism 8 to perform horizontal positioning of the external threaded ring 5. A chamfering mechanism 10 is provided on one side of the processing station 4 for chamfering the inner ring of the opening of the external threaded ring 5 in the positioning mechanism 8. A material unloading mechanism 11 is provided on the positioning mechanism 8. A material unloading port 12 is provided on the buffer station 3. A receiving frame 34 is provided below the workbench 1. The upper opening 35 of the receiving frame 34 is directly opposite the material unloading port 12 to receive the external threaded ring 5 falling from the material unloading port 12. In this embodiment, when the material handling mechanism 7 enters the buffer station 3, the unloading port 12 is closed to prevent the external thread ring 5 to be processed on the material handling mechanism 7 from falling out of the unloading port 12. Conversely, when the material handling mechanism 7 leaves the buffer station 3, the unloading port 12 is opened, and at this time the unloading mechanism 11 pushes the external thread ring 5 in the positioning mechanism 8 into the unloading port 12 for unloading.

[0035] To achieve directional arrangement and transmission of the feeding device, the feeding device is a vibratory feeder 6. The material handling mechanism 7 includes a material handling block 14 connected to the outlet 13 of the feeding device and capable of horizontal sliding on the upper surface of the worktable 1, a material handling groove 15 formed on the upper surface of the material handling block 14 for the external threaded opening 5 of the feeding device to enter horizontally, and a power source 16 for driving the material handling block 14 to switch between the material handling station 2 and the buffer station 3. The side of the material handling groove 15 for the external threaded opening 5 to enter is connected to the outlet 13 of the vibratory feeder 6. The power source 16 is a cylinder fixed to the upper surface of the worktable 1, and its telescopic rod is horizontally fixed to one side of the material handling block 14 to realize the horizontal movement of the material handling block 14 and the material handling groove 15, thereby facilitating the switching of the workstation.

[0036] To prevent the feeding device from continuing to output the external thread ring 5 when the external thread ring 5 is being processed, a baffle 17 is integrally provided on the side of the material pick-up trough 15 away from the buffer station 3. When the material pick-up mechanism 7 enters the buffer station 3, the baffle 17 simultaneously seals the outlet 13 of the feeding device to prevent the output of the external thread ring 5.

[0037] To enable the automatic opening and closing of the opening of the material chute 15 on the side away from the feeding device, a second baffle 18 is fixedly installed on the worktable 1. This baffle 18 is used to seal the opening of the material chute 15 on the side away from the feeding device at the material picking station 2 and to open the opening of the material chute 15 on the side away from the feeding device at the buffer station 3. The second baffle 18 is elongated and is arranged along the movement direction of the material picking block 14, and is fitted against the side of the material picking block 14 away from the feeding device, while being located at the position of the material picking station 2. In this way, it not only achieves the baffle function, but also plays a guiding role, thereby improving the stability and smoothness of the movement of the material picking block 14.

[0038] To ensure stability during chamfering of the external threaded bezel 5, the positioning mechanism 8 includes a positioning seat 19 fixed to the upper surface of the worktable 1 at the machining station 4, a positioning groove 20 formed on the upper surface of the positioning seat 19, and an inlet 21 formed on the side of the positioning groove 20 near the buffer station 3 for horizontal entry of the external threaded bezel 5. The width of the positioning groove 20 is equal to the outer diameter of the external threaded bezel 5, preventing horizontal displacement of the external threaded bezel 5 within the positioning groove 20. A positioning block 22 is fixedly provided on the side of the positioning groove 20 away from the buffer station 3. A positioning groove 23, conforming to the outer circumferential surface of the external threaded bezel 5, is formed on the side of the positioning block 22 near the buffer station 3. The positioning groove 23 is concave and arc-shaped. Multiple anti-slip ridges 24 are distributed on the groove wall of the positioning groove 23, thereby restricting the circumferential rotation of the external threaded bezel 5.

[0039] To realize the material pushing function of the feeding device, the feeding mechanism 9 includes a push block 25 located on the side of the buffer station 3 away from the processing station 4, and a second power source 26 located on the worktable 1 to drive the push block 25 to push the external threaded ring 5 from the buffer station 3 into the positioning mechanism 8 and prevent the external threaded ring 5 from disengaging from the positioning mechanism 8. The second power source 26 is preferably a cylinder fixed to the upper surface of the worktable 1, located on the side of the push block 25 away from the buffer station 3, with its telescopic rod horizontally fixed to the push block 25 to realize the horizontal movement of the push block 25. To improve the stability of the push block 25 during movement, a guide seat 37 fixed to the upper surface of the worktable 1 is provided between the buffer station 3 and the second power source 26. A guide groove 38 for the extension and retraction of the push block 25 is horizontally passed through the guide seat 37. When the material taking block 14 is pushed to the buffer station 3, the side of the material taking groove 15 that allows the external thread ring 5 to enter is connected to the guide groove 38, and the other side is connected to the inlet 21 of the positioning groove 20, so that the push block 25 can push the external thread ring 5 in the material taking groove 15 into the positioning groove 20 and horizontally abut against the external thread ring 5, thereby realizing the horizontal locking of the external thread ring 5.

[0040] In order to improve the tightness of the connection between the push block 25 and the external thread ring 5, the push block 25 is provided with a positioning groove 27 adapted to the outer circumference of the external thread ring 5 on the side near the buffer station 3. The positioning groove 27 is a concave semi-circular arc shape, and its surface is distributed with a number of anti-slip textures 36, thereby improving the rotation limitation performance of the positioning groove 27.

[0041] To achieve the chamfering function of the chamfering mechanism 10, the chamfering mechanism 10 includes a chamfering cutter 28 positioned above the processing station 4, a drive source 29 for driving the chamfering cutter 28, and a lifting mechanism 30 positioned on the worktable 1 to drive the drive source 29 to move up and down. The chamfering cutter 28 is located directly above the positioning groove 20. The drive source 29 is a vertically mounted motor, with its output shaft vertically fixed to the upper end of the chamfering cutter 28. The lifting mechanism 30 is a screw-type jack or a hydraulic jack, with its external lifting platform 39 fixed to the drive source 29 by several bolts 42 to achieve the forward and backward movement of the chamfering cutter 28. In this embodiment, the specific structure and working principle of the screw-type jack and the hydraulic jack are common knowledge in the art and do not involve improvements to this solution, therefore, they will not be described in detail.

[0042] To achieve the unloading function of the unloading mechanism 11, the unloading mechanism 11 includes a push plate 31 disposed in the positioning groove 20 and a power source 32 for driving the push plate 31 to perform horizontal reciprocating linear motion within the positioning groove 20. The power source 32 is preferably a cylinder fixed to the upper surface of the worktable 1 and located on the side of the push plate 31 away from the buffer station 3, with its extension rod horizontally fixed to the tail end of the push plate 31. To improve the stability and smoothness of the push plate 31 during operation, a guide groove 41 is horizontally passed through the positioning block 22 for the push plate 31 to slide through. The guide groove 41 is connected to the positioning groove 20 to facilitate unloading by the push plate 31.

[0043] The power source 16, power source 26 and power source 32 mentioned above are all fixed to the upper surface of the workbench 1 by the bracket 40. Their specific structure and installation method are common knowledge in the field and will not be described in detail here.

[0044] The specific working principle is as follows: When the chamfering device is running, the vibratory feeder 6 can directionally transport multiple blanks of external threaded rings 5. When the material picker block 14 is located at the material pickering station 2, the material pickering groove 15 is connected to the outlet 13 of the vibratory feeder 6 to receive a single blank of external threaded ring 5 output by the vibratory feeder 6. After the material pickering is completed, the power source 16 pushes the material pickering groove 15 on the material picker block 14 forward into the buffer station 3, and seals the outlet 13 of the vibratory feeder 6 through the partition 17, so that the vibratory feeder 6 stops outputting external threaded rings 5. At the same time, the two ends of the material pickering groove 15 are respectively connected to the inlet 21 of the positioning groove 20 and the guide groove 38, so that the power source 26 can drive the pusher block 25 to push the external threaded ring 5 from the material pickering groove 15 into the positioning groove 20 and horizontally abut against the external threaded ring 5 through the positioning groove 27 to lock the horizontal position of the external threaded ring 5. After locking, drive source 29 drives chamfering cutter 28 to run, and lifting mechanism 30 drives drive source 29 to descend to achieve the feed operation, thereby performing inner chamfering on the port with the external threaded ring 5 facing upward. After chamfering, lifting mechanism 30 drives drive source 29 to rise to complete the retraction. Then, power source 26 drives push block 25 to retract into guide groove 38, and then power source 16 drives material pick-up block 14 back to material pick-up station 2 to expose unloading port 12. At this time, power source 32 drives push plate 31 forward to push the external threaded ring 5 in positioning groove 20 into unloading port 12, and collects the processed external threaded ring 5 into receiving frame 34 through unloading port 12. Finally, power source 32 drives push plate 31 to reset. Material pick-up block 14, which has returned to material pick-up station 2, can receive external threaded ring 5 output by vibratory feeder 6 again for a new round of processing. By repeating the above steps, the automatic feeding, processing, and unloading of the external threaded ring 5 can be achieved. Throughout the entire processing, the port to be processed of the external threaded ring 5 is always positioned upwards to facilitate the chamfering mechanism 10 to perform inner ring chamfering.

[0045] The above operation process can be implemented using the PLC's built-in program or an equivalent analog circuit, which is common knowledge in this field and will not be elaborated here.

[0046] In addition, the specific structure of the chamfering tool 28 can be customized according to customer needs, which is common knowledge in this field and will not be elaborated here.

Claims

1. An external thread gage corner rounding device characterized by: The system includes a workbench (1), on which a material picking station (2), a buffer station (3) and a processing station (4) are arranged in sequence. The material picking station (2) is equipped with a feeding device for sequentially conveying multiple external thread rings (5) and a material picking mechanism (7) for receiving a single external thread ring (5) output by the feeding device and conveying the external thread ring (5) to the buffer station (3). The processing station (4) is equipped with a positioning mechanism (8). The buffer station (3) is equipped with a feeding mechanism (9) for pushing the external thread ring (5) on the buffer station (3) into the positioning mechanism (8) to perform horizontal positioning of the external thread ring (5). The processing station (4) is equipped with a chamfering mechanism (10) for chamfering the inner ring of the opening of the external thread ring (5) in the positioning mechanism (8). The positioning mechanism (8) is equipped with a discharge mechanism (11). The buffer station (3) is equipped with a discharge port (12). When the material handling mechanism (7) enters the buffer station (3), the unloading port (12) is closed; conversely, when the material handling mechanism (7) leaves the buffer station (3), the unloading port (12) is opened; when the unloading port (12) is open, the unloading mechanism (11) pushes the external threaded ring (5) in the positioning mechanism (8) into the unloading port (12) for unloading.

2. A device for chamfering the box of an externally threaded nipple as defined in claim 1 wherein: The feeding device is a vibratory feeder (6).

3. A device for chamfering the box of an externally threaded nipple as defined in Claim 1 wherein: The material handling mechanism (7) includes a material handling block (14) connected to the outlet (13) of the feeding device, a material handling groove (15) opened on the upper surface of the material handling block (14) for the external threaded ring (5) of the feeding device to enter horizontally, and a power source (16) for driving the material handling block (14) to switch between the material handling station (2) and the buffer station (3).

4. A device for chamfering the box of an externally threaded nipple as defined in Claim 3 wherein: A baffle (17) is provided on the side of the feeding trough (15) away from the buffer station (3). When the feeding mechanism (7) enters the buffer station (3), the baffle (17) blocks the outlet (13) of the feeding device to prevent the output of the external thread ring (5).

5. An external thread knuckle chamfering device according to claim 3 wherein: The workbench (1) is provided with a second partition (18) for sealing the opening of the material pick-up trough (15) away from the feeding device at the material pick-up station (2) and for opening the opening of the material pick-up trough (15) away from the feeding device at the buffer station (3).

6. An external thread knuckle chamfering device according to claim 1 wherein: The positioning mechanism (8) includes a positioning seat (19) set on the worktable (1), a positioning groove (20) opened on the upper surface of the positioning seat (19), and an inlet (21) opened on the side of the positioning groove (20) near the buffer station (3) for the external threaded ring (5) to enter horizontally.

7. A device for chamfering the box of an externally threaded nipple as defined in Claim 6 wherein: A positioning block (22) is provided on the side of the positioning groove (20) away from the buffer station (3), and a positioning groove (23) is provided on the side of the positioning block (22) close to the buffer station (3) to adapt to the outer circumferential surface of the external thread ring (5).

8. A device for chamfering the box of an externally threaded nipple as defined in Claim 7 wherein: The groove wall of the positioning groove (23) is covered with anti-slip ridges (24).

9. An external thread knuckle chamfering device according to claim 1 wherein: The feeding mechanism (9) includes a push block (25) located on the side of the buffer station (3) away from the processing station (4) and a second power source (26) located on the worktable (1) to drive the push block (25) to push the external thread ring (5) from the buffer station (3) into the positioning mechanism (8) and restrict the external thread ring (5) from leaving the positioning mechanism (8).

10. A device for chamfering the box of an externally threaded nipple as defined in Claim 9 wherein: The push block (25) has a positioning groove (27) on the side near the buffer station (3) that is adapted to the outer circumferential surface of the external threaded ring (5).

11. An external thread knuckle chamfering device according to claim 1 wherein: The chamfering mechanism (10) includes a chamfering cutter (28) disposed above the machining station (4), a drive source (29) for driving the chamfering cutter (28) to run, and a lifting mechanism (30) disposed on the worktable (1) to drive the drive source (29) to rise and fall.

12. An external thread knuckle chamfering device according to claim 6 wherein: The unloading mechanism (11) includes a push plate (31) disposed in the positioning groove (20) and a power source (32) for driving the push plate (31) to perform horizontal reciprocating linear motion in the positioning groove (20).

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