KR-102963852-B1 - Portable Pipe Cutting Bevelling Machine

Abstract

The disclosed movable pipe cutting and chamfering device comprises: a fixed ring frame (100) in which two semicircular ring frames (100A, 100B) are combined to form a circular hollow; a clamp (300) installed on the fixed ring frame (100) to fix a circular pipe (2) inserted into the circular hollow so as to be placed at the center; a rotating ring (200) rotatably installed on the front of the fixed ring frame (100) and having gear teeth (220) formed on its outer surface; a gear box (400) having a ring drive gear (420) that meshes with the rotating ring (200); and a trigger assembly (600) fixedly installed on the fixed ring frame (100) and having a trigger pin (620). The device includes a cutting module (700) that is installed on the rotating ring (200) and is equipped with a cutting chamfering blade (790), and is triggered by the trigger pin (620) each time the rotating ring (200) rotates, so that the cutting chamfering blade (790) descends stepwise in the radial direction of the circular pipe (2) to cut and chamfer the circular pipe (2); the device also includes a load detection unit (520) that detects a load generated during the cutting and chamfering process of the circular pipe by the cutting module (700) and is detachably connected to the gear box (400) to drive the ring drive gear (420) to rotate the rotating ring (200), and a control unit (540) that controls the driving of the ring drive gear (420) based on the detection result of the load detection unit (520).

Inventors

• 김병민

Assignees

• 주식회사 신흥이엔씨

Dates

Publication Date

20260512

Application Date

20251205

Claims (3)

1. In a movable pipe cutting and chamfering device, A fixed ring frame (100) in which two semicircular ring frames (100A, 100B) are combined to form a circular hollow; A clamp (300) installed on the fixed ring frame (100) to fix the circular pipe (2) inserted into the circular hollow so that it is placed at the center; A rotating ring (200) rotatably installed on the front of the fixed ring frame (100) and having gear teeth (220) formed on its outer surface; A gearbox (400) having a ring drive gear (420) that meshes with the above-mentioned rotating ring (200); A trigger assembly (600) fixedly installed on the above fixed ring frame (100) and having a trigger pin (620); A cutting module (700) installed on the above-mentioned rotating ring (200) and equipped with a cutting chamfering blade (790), which is triggered by the trigger pin (620) each time the above-mentioned rotating ring (200) rotates once, causing the cutting chamfering blade (790) to descend stepwise in the radial direction of the circular pipe (2) to cut and chamfer the circular pipe (2); A power tool (500) that is detachably connected to the gearbox (400) to rotate the ring drive gear (420) and rotates the rotating ring (200); A load sensing unit (520) that measures the motor current or torque applied to the above power tool (500) to detect the real-time cutting load during the cutting and chamfering process of the circular pipe by the cutting module (700); and It includes a control unit (540) that controls the rotational drive of the ring drive gear (420) based on the detection result of the load detection unit (520), and The cutting module (700) comprises a guide block (710) that is fixedly installed on the rotating ring (200) and includes a guide formed along the radial direction of the circular pipe (2); a sliding block (720) that is installed to slide along the guide in the radial direction of the circular pipe (2); a cutting chamfering blade (790) that is detachably coupled to the sliding block (720) and faces the outer surface of the circular pipe (2); a screw (730) that is screw-coupled to a screw hole formed in the sliding block (720) and moves the sliding block (720) and the cutting chamfering blade (790) coupled to the sliding block (720) in the radial direction of the circular pipe (2) by rotation; and a screw (730) that is installed at the top of the screw (730) and rotates in engagement with the trigger pin (620) each time the rotating ring (200) rotates once, thereby lowering the sliding block (720) and the cutting chamfering blade (790) coupled to the sliding block (720) to the circular It includes a star wheel (740) that controls the depth at which the pipe (2) is cut, The above control unit (540) receives the measurement value of the above load detection unit (520), compares it with a preset overload threshold, and when an overload is detected, stops the forward rotation of the above rotating ring (200), and then rotates the above rotating ring (200) in the reverse direction to a reverse rotation position by engaging the above star wheel (740) with the above trigger pin (620), thereby retracting the above cutting chamfering blade (790) from the cut notch of the circular pipe (2), characterized by a movable pipe cutting and chamfering device.
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Description

Portable Pipe Cutting Bevelling Machine The present invention relates to a cutting and chamfering technique for circular pipes, and more specifically, to a movable pipe cutting and chamfering device capable of simultaneously performing cutting and chamfering of circular pipes. Generally, cutting large circular pipes involved the use of oxygen-acetylene cutters or manual cutters; however, these methods were limited in explosion-hazardous environments and presented difficulties in subsequent weld edge preparation due to low precision of the cut surface. Recently, split-frame type cold-mobile cutting devices that ensure both portability and precision are being used. However, after the cutting operation, chamfering is required to form a bevel on the cut surface of the circular pipe to increase the welding area between the pipes. Although mobile chamfering devices have existed previously, they are inefficient because they first cut the circular pipe to form a vertical cut surface and then perform chamfering on that vertical cut surface to form the bevel. In this regard, a movable pipe cutting and chamfering device has been proposed that cuts a circular pipe while forming a bevel surface in the middle. However, conventional devices have limitations, such as a complex structure, difficulty in obtaining a high-quality chamfered surface, and difficulty in handling cutting loads. Furthermore, while it is advantageous to accurately supply cutting fluid to the cutting surface during the cutting process, existing devices have limitations in accurately supplying cutting fluid to the cutting surface or bevel surface where the chamfer is formed. In particular, the low rigidity due to the device's portability made it prone to chattering (vibration) during cutting, which significantly degraded the surface roughness of the cutting surface. Since cutting fluid supply relied on a separate electronic valve or manual operation, the device design was complex and breakdowns were frequent; additionally, cooling efficiency was reduced because it was difficult to track the nozzle position in accordance with changes in the depth of the cutting chamfering blade. FIG. 1 is a front view illustrating a movable pipe cutting and chamfering device according to one embodiment of the present invention, and FIG. 2 is a front view of a movable pipe cutting chamfering device according to one embodiment of the present invention, with the fixed ring frame and the rotating ring in an open state, and FIG. 3 is a schematic side view illustrating a movable pipe cutting and chamfering device according to one embodiment of the present invention, and FIG. 4 is a perspective view for explaining the trigger assembly and cutting module of the movable pipe cutting chamfering device illustrated in FIG. 1 to 3, and FIG. 5 is a drawing for explaining the cutting fluid discharge module of the movable pipe cutting chamfering device illustrated in FIG. 1 to 3, and FIG. 6 is a drawing showing another alternative example of the cutting fluid discharge module illustrated in FIG. 5, and FIG. 7 is a flowchart for explaining the operation process of an automatic overload detection and avoidance mechanism of a movable pipe cutting chamfering device according to one embodiment of the present invention. Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein. In describing the present invention, the size or shape of the components shown in the drawings may be exaggerated or simplified for clarity and convenience of explanation. Furthermore, terms specifically defined in consideration of the structure and operation of the present invention may vary depending on the intent or practice of the user or operator. These terms should be interpreted in a meaning and concept consistent with the technical spirit of the present invention based on the content throughout this specification. To clearly explain the present invention, descriptions of parts unrelated to the technical concept of the present invention have been omitted, and the same reference numerals are used for identical or similar components throughout the specification. In addition, in various embodiments, components having the same configuration are described using the same reference numerals only in the representative embodiment, and in other embodiments, only configurations different from the representative embodiment are described. Throughout the specification, when a part is described as being "connected" to another part, this includes not only cases where they are "directly connected," but also cases where they are "indirectly connected" with other members in between. Furthermore, when a part is described as "including" a component, this may mean that it includes