KR20080090689A - Chamfering machine for a large hole pipe - Google Patents

Abstract

A chamfering machine for a large diameter pipe is provided to operate a tool rest automatically in chamfering both ends of the pipe by driving a cylinder and a motor. A chamfering machine for a large diameter pipe comprises front and rear supports(10,20), a lift unit(30), and a processing unit(70). The front and rear supports are mounted on the ground to holds different diameters of pipes thereon. Located between the supports, the lift unit includes a lower turn table(40), a back and forth transferring unit(50), and a lift unit(60). The lower turn table rotates the pipes at 180°. The back and forth transferring unit slides the pipe above the turn table. The lift unit moves the pipe up and down on the back and forth transferring unit. The processing unit includes a tool rest(80) and a clamp(90). The tool rest chamfers both ends of the pipe. The clamp fixes the pipe while chamfering the pipe.

Description

Chamfering machine for a large hole pipe

1 is an overall configuration showing a preferred example of the present invention

2a to 2b is a front view and a side view showing the structure of the front pedestal of the chamfering machine provided by the present invention

Figure 3a to 3b is a front view and a side view showing the structure of the rear pedestal of the chamfering machine provided by the present invention

Figure 4a is a front view showing the structure of the lift device of the chamfering machine provided by the present invention

Figure 4b is a plan view showing the structure of a turntable of the lift apparatus of the present invention

4c to 4d is a plan view and a partial cross-sectional view showing the structure of the front and rear transfer means of the lift apparatus of the present invention

Figure 4e is a bottom perspective view showing the structure of the lifting means of the lift apparatus of the present invention

Figure 4f to 4g is a plan view and a partial cross-sectional view showing the structure of the lifting means of the lift apparatus of the present invention

5a to 5c is a cross-sectional view showing the overall structure of the processing apparatus of the chamfering machine provided by the present invention and a cross-sectional view showing the working state

Figure 5d is a partial cross-sectional view showing a front and rear sliding structure of the processing apparatus of the present invention.

Figure 5e is a rear view showing a sliding structure of the slider and the sliding guide plate of the processing apparatus of the present invention

5F is a cross-sectional view taken along line A-A of FIG. 5A, showing a partial cross-sectional view showing a rotation means of the tool post;

Figure 5g is a front and side cross-sectional view showing the structure of the tool post and the face plate of the processing apparatus of the present invention

◀ Explanation of symbols used in the main part of the drawing ▶

A: Pipe 1: Chamfering Machine

10: front stand 20: rear stand

11, 21: supporters 12, 22: coupling sphere

12a, 22a: Joining hole 13,23: Support

13a, 23a: coupling rod 24: stopping cylinder

25: Rod 26: Rack Gear

27: Pinion gear 28: Stopper

30: lift device

40: turntable 41: supporter

42: bearing 43: support shaft

44: interlocking means 45: deceleration motor

46: wheel 47: round guide rail

50: before and after transfer means 51: transfer table

52: Linear guide rail 53: Guide bracket

54: Packing 54a: Pressure bolt

55: transfer cylinder 56: rod

60: lifting means 61: lifting table

62: tooth roller 63: old tooth roller

64: drive motor 65: drive means

66: pivot shaft 66a: first lifting lever

66b: 2nd lifting lever 67a, 67b: rolling roller

68: lift cylinder 69: load

69a: support bracket

70: processing apparatus 71: mounting table

72: machining feed cylinder 73: rod

74: main frame 75: sliding guide

80: Tool stand 80a: Casing

81: Byte 82: Byte holder

83: face plate 84: rotation motor

85: drive shaft 86a: worm

86b: Worm wheel 87: Forward and reverse motor

87a: slide screw 88: guide rail

89: Information roller

90: clamp 91: hollow shaft

92: clamping cylinder 93: rod

94: slide bar 95: expansion guide

95a: Slope 96: Slider

97: sliding guide 98: interval maintenance cylinder

99: loaded

The present invention relates to a chamfering machine for large-diameter pipe, more specifically, to rotate the pipe 180 ° by a lift device for elevating the pipe with a device for chamfering both ends of the large-diameter pipe, usually 14 inches to 48 inches. Automated pipe transfer by forward and backward transfer, and automatic operation of tool post when chamfering both ends of pipes by driving cylinder and motor, improving overall efficiency and convenience while reducing chamfering processing time To provide a chamfering machine for large diameter pipes that can improve the accuracy of machining.

In general, pipes produced with various diameters are chamfered at both ends after forming to facilitate welding or pipe jointing, especially in the case of large diameter pipes with large diameters. Large and heavy, chamfering at both ends is very difficult and one of the cumbersome work was not uniform chamfering.

The conventional large diameter chamfering device for pipes was mostly made by manual operation, which requires a separate crane for pipe transfer and rotation, which requires a redundant investment of equipment. The operation of the head and the chuck is handled, and the degree of processing is determined according to the skill of the operator. Therefore, the chamfering at both ends of the pipe was not uniform. More specifically, the crane and the crane used for conveying and rotating the pipe Difficulties in setting itself due to the dividing of the pipe fixing equipment and the need for a setting time that is significantly longer than the working time due to manual operation, which makes it difficult to prompt chamfering. It is also easy to secure skilled workers by the risk of It is not true.

The above-mentioned conventional chamfering device for large diameter pipes has a disadvantage in that work efficiency is lowered by manual operation by an operator's manpower, and it takes a lot of work time by adjusting the height of the bite and manually operating the tool bar. Since there is a large amount of product defects due to the chamfering is not made, and the manufacturing cost of the product is also very expensive, there is a problem that is very economically expensive to develop a device that can solve the above problems.

In the present invention, a chamfering machine having a new configuration that can solve all the problems of the conventional large-diameter pipe chamfering device as described above, and the present invention, the present invention between the front and rear pedestals that can accommodate the pipe of various diameters A lift device is provided, which is provided with a turntable rotatable 180 ° and a conveying means installed on the turntable and conveying the pipe forward and backward, and an elevating means installed on the upper portion of the conveying means for elevating the pipe. It consists of a processing device equipped with a tool stand and a clamp that fixes the pipe when chamfering. The lifting device and the processing device are configured to be driven automatically by a cylinder and a motor. It allows you to chamfer both ends of the The chamfering machine for large diameter pipes, which can obtain high quality large diameter pipes by reducing defect rate and improving reliability by maximizing efficiency, increasing work convenience, and processing chamfers at both ends of the pipe more quickly and uniformly. The present invention has been completed in view of the technical problem.

The present invention relates to a chamfering machine (1) for large diameter pipes (A) for chamfering both ends of large diameter pipes of 14 inches to 48 inches, and will be described in detail with reference to the specific means for solving the above-mentioned technical problems. As follows.

1 is an overall configuration diagram showing a preferred example of the present invention, when seen from the above figure, the pipe A rotates 180 ° between the front and rear pedestals 10 and 20 on which the pipes A of various diameters are placed. A tool stand provided with a lift device 30 capable of raising or lowering and transporting forward and backward, and having a bite 81 for chamfering one end of the pipe A at the rear of the rear base 20 ( 80) and a processing device 70 equipped with a clamp 90 that fixes the pipe A when chamfering is installed to constitute the entire chamfering machine 1 for the large-diameter pipe A.

2A to 3B show a detailed configuration of the front and rear pedestals 10 and 20, wherein coupling holes 12a and 22a are formed at upper portions of the lower supporters 11 and 21 fixedly installed on the ground, respectively. The supports 12 and 22 are fixed to the left and right symmetrically and the coupling holes 12a and 22a of the left and right coupling holes 12 and 22 respectively support the pipes A and Although the coupling rods 13a and 23a are configured to be coupled by force fitting, the coupling rods 13a and 23a may have different lengths according to pipes A of various diameters so that the diameters of the pipes A are different. The center is always configured to coincide with the machining center of the machining apparatus 70, and the rear pedestal 20 has a rack-gear at the end of the rod 25 of the stopping cylinder 24 as shown in Figs. 3A to 3B. And a stopper 28 in a pinion-gear 27 that is geared to the rack gear 26. Then, the stopper 28 is extended by stretching operation of the stopper cylinder 24. ) Is configured to angularly move vertically and horizontally.

As shown in FIG. 4A, the lift apparatus 30 has a front and rear conveying means 50 which slides back and forth on an upper portion of the lower turntable 40 which is rotated by 180 °, and above the front and rear conveying means 50. As a configuration in which the lifting means 60 for elevating the pipe A is provided, the turntable 40 is a support shaft 43 supported by the bearing 42 on the supporter 41 fixed to the ground as shown in Figs. 4A to 4B. Fixed to the ground, and the support shaft 43 is connected to the reduction motor 45 by an interlocking means 44 composed of a chain and a sprocket, and fixed to the ground by installing several wheels 46 in the lower radial direction. It is configured to rotate freely along the annular guide rail 47 is configured to rotate by 180 ° according to the rotation operation of the reduction motor (45).

The front and rear transfer means 50 is fixed to a pair of linear guide rail 52 on the upper side of the turntable 40, as shown in Figure 4c and 4d, and the transfer table 51 by the pressure bolt 54a on the other side The guide bracket 53 in which the packing 54 pressurizes is fixed and installed so that the transfer table 51 is settled on the straight guide rail 52 and the guide bracket 53, and one side of the transfer table 51. In this case, a pair of feed rollers 52a connected to and supported by the linear guide rails 52 are installed, and a transfer table 51 is connected to the rod 56 end of the transfer cylinder 55 fixedly installed on the turntable 40. By the expansion and contraction operation of the transfer cylinder 55 is configured so that the transfer table 51 is conveyed back and forth.

As shown in FIGS. 4E to 4G, the elevating means 60 freely rotates a pair of settle rollers 62 and a drive settle roller 63 on which pipes A are placed before and after the upper portion of the elevating table 61. The drive motor 64 is connected to the drive set roller 63 on one side by a drive means 65 such as a chain and a sprocket, and the drive set roller 63 is rotated by the drive motor 64 to pipe the drive set roller 63. (A) and the first lifting lever 66a angular movement in the 'X' shape around the rotation shaft 66 between the elevating table 61 and the lower transfer table 51; A pair of second lifting levers 66b are installed to the left and right, respectively, one end of the first lifting lever 66a is fixed to the transfer table 51 so as to be rotatable, and the other end is brought into contact with the lifting table 61 in front and rear. The rolling roller 67a is installed, and one end of the second lifting lever 66b is fixed to the lifting table 61 so as to be rotatable. And the other end is provided with a rolling roller (67b) which is guided back and forth in contact with the transfer table 51, the end of the rod 69 of the lift cylinder 68 installed so that one end is rotated on the transfer table 51, the pivot shaft (66) The lifting table 61 is lifted from the upper part of the transfer table 51 by expansion and contraction operation of the lift cylinder 68 by constructing and connecting the support brackets 69a at which both ends are fixed to the left and right first lifting levers 66a at the upper part. And configured to descend.

5A to 5G illustrate the processing apparatus 70 described above, wherein the processing apparatus 70 includes a tool post 80 and a chamfer equipped with a bite 81 or the like which chamfers one end of the pipe A. FIG. The end of the rod 73 of the processing transfer cylinder 72 is installed so that one end is rotated on the lower mount 71 to be mounted to the clamp 90 to fix the pipe (A) at the time of the furring tool tool 80 and The main frame 74 is fixedly installed on the main frame 74 in which the clamp 90 is installed, and the main frame 74 is moved back and forth by the telescopic operation of the processing transfer cylinder 72 in the sliding guide 75 fixedly installed at both sides of the mounting table 71. It is configured to slide, and the upper front of the main frame 74, the bite holder is transferred to the center and the edge of the face plate 83 and the face plate 83 which is rotationally driven by the rotation motor 84 fixedly fixed to one side of the casing (80a) Chamfering the end of the pipe (A) mounted to the 82 and the bite holder 82 The byte 81, tool rest 80 is configured to be securely fixed.

The hollow shaft 91 penetrates back and forth to the center of the casing (80a) of the tool post 80, the inside of the hollow shaft 91 to the rod 93 of the clamping cylinder 92 of the rear One end of the slide bar 94 is configured to slide back and forth, and the front end of the slide bar 94 is fixed to the clamp (90) that is inserted into the pipe (A) to secure the pipe (A) when chamfering The clamp 90 is fixed to the expansion guide (95) having an inclined surface (95a) inclined forwardly in the front end of the hollow shaft 91 by clamping cylinder 90 when contracting ) Is expanded while moving backwards on the inclined surface (95a) of the expansion guide (95) is configured to be pressed to the inner surface of the pipe (A) to clamp the pipe (A).

The hollow shaft 91 is fixed to the rear end of the slider 96 which slides back and forth in the sliding guide plate 97 fixed to the upper rear of the main frame 74, the clamping cylinder 92 is the slider 96 The slider 96 is fixedly installed at the end of the rod 99 of the space keeping cylinder 98 fixedly installed on the sliding guide plate 97, and thus, on the tool rest 80 by the telescopic operation of the space keeping cylinder 98. Since the hollow shaft 91 so as to protrude constantly, the interval between the tool post 80 and the clamp 90 is configured to be kept constant.

In addition, the bite holder 82 and the face plate 83 of the tool post 80 are fixed to the one side of the casing 80a of the tool post 80 as shown in FIG. 5F of the rotation motor 84 and the rotation motor 84. The worm 86a fixed to the drive shaft 85 and the worm wheel 86b geared to the worm 86a are configured to rotate when the rotation motor 84 is driven, and the bite holder 82 is illustrated in FIG. As in 5g, it is coupled to the slide screw 87a which is rotated by the forward and reverse driving of the forward and reverse driving motor 87, and then slides to the center and the edge of the face plate 83 on the guide rail 88 fixed to the face plate 83. When the guide roller 89 rotates on the inner surface of the pipe A when the face plate 83 is rotated by installing the guide roller 89 freely rotating at the lower portion of the bite holder 82 so as to protrude forward. By chamfering by the bite 81, the chamfering is made uniform regardless of the roundness of the pipe A. It will be configured.

In the drawing, reference numeral 28a denotes a detection sensor for detecting an angular movement of the stopper 28 installed on the rear pedestal 20, and 51a is installed on the transfer table 51 to roll roller 67b of the second lifting lever 66b. Is supported on the elevating table 61, 61a is a support plate on which the rolling roller 67a of the first elevating lever 66a is connected and supported, 82a is mounted on the bite holder 82, the bite 81 is The spring which gives tension to the guide roller 89 so that it may fluidly contact the process surface of the pipe A is shown.

The present invention configured as described above is a chamfering machine (1) for chamfering both ends of the large-diameter pipe (A) at the time of mass production of large-diameter pipe (A) of 14 inches to 48 inches, when chamfering the pipe (A) The lift device 30 provided between the front and rear pedestals 10 and 20 is lifted and transported in the state in which the pipe A is settled, transported back and forth, and the other end is rotated by 180 ° after chamfering one end of the pipe A. It can be chamfered again, and various operations such as chamfering the end of the pipe A with the tool post 80 or clamping the pipe A with the clamp 90 when chamfering are performed by various cylinders and motors. It can be driven automatically to chamfer both ends of the large-diameter pipe (A) without a separate crane that rotates the conventional pipe (A) to maximize the efficiency of work, increase the convenience of work, both ends of the pipe (A) Faster and more uniform chamfering It will be described in more detail below the operation of the present invention to enable processing.

The front and rear pedestals 10 and 20 are mounted, the lift device 30 is installed between the front and rear pedestals 10 and 20, and the processing apparatus 70 is installed behind the rear pedestal 20. Chamfer both ends of the pipe (A), but first, the first lifting lever (66a) around the rotating shaft (66) by extending the rod (69) in the lift cylinder (68) of the lifting means (60) of the lift device (30) ) And the second lifting lever 66b in the form of an 'X' angular movement to raise the lifting table 61, and then on the driving settling roller 63 and the settling roller 62 before and after the lifting table 61. Large diameter pipe (A) as a separate crane (simply lift the pipe (A) to the lift device 30 (simple ceiling crane and forklift, etc.) is not a separate facility for the rotation of the conventional pipe (A). ) And so on. At this time, one side of the first elevating lever 66a and the second elevating lever 66b is fixed to the transfer table 51 and the elevating table 61, respectively, and the rolling roller 67a on the other side of the first elevating lever 66a. ) Is connected to the support plate 61a on the elevating table 61, and the rolling roller 67b on the other side of the second elevating lever 66b is connected to the support plate 51a on the transfer table 51 to be lifted cylinder 68. The rolling rollers 67a and 67b are connected to the supporting plates 61a and 51a in accordance with the expansion and contraction of the rolls, and the lifting and lowering of the lifting table 61 is performed by the rolling table 51 above.

Thereafter, the stopper cylinder 24 of the rear base 20 is operated so that the rod 25 is extended so that the pinion gear 27 is rotated by the rack gear 26 fixed to the rod 25 end. The stopper 28 installed on the shaft 27 is erected vertically, and at this time, the stopper 28 is operated by the detection sensor 28a which has recognized the stopper 28 in a horizontal state as the stopper 28 is angularly moved vertically. It is possible to detect that it is in the middle, and then the transfer table of the lower forward and rearward transfer means 50 provided with the elevating table 61 and the first and second elevating levers 66a and 66b on which the pipe A is placed. 51 is conveyed from the top of the turntable 40 to the rear by the extension of the rod 56 in accordance with the operation of the transfer cylinder 55, with the end of the pipe A continuously to the rear until it reaches the stopper 28 The transfer is made, and the pipe A is transferred to the stopper 28, and then lifted by the lift cylinder 68. While lowering the block 61, the stopper 28 is angularly moved horizontally while the pipe A is placed on the front and rear pedestals 10 and 20, and at this time, according to the diameter of the pipe A to be chamfered, the pipe ( The coupling rods 13a and 23a are forcibly fitted to the supports 13 and 23 having the coupling rods 13a and 23a of a predetermined length such that the center of A) coincides with the machining center of the processing apparatus 70. The fitting holes 12a and 22a are fitted in advance to the coupling holes 12 and 22 on the supporters 11 and 21.

After the above operation, as shown in FIG. 5B, the main guide 74 of the processing apparatus 70, on which the clamp 90 and the tool post 80 are mounted, is moved to the mounting guide 71 by the processing guide cylinder 72. Sliding forward at 75) allows the clamp 90 to be inserted into the interior of the pipe A. When the clamp 90 is inserted to the position of the rear stand 20, the operation of the feed cylinder 72 is stopped and stopped. Then, the rod 93 of the clamping cylinder 92 is retracted to pull the slide bar 94 backward to pull the clamp 90 fixed to the tip of the slide bar 94, wherein the hollow shaft (91) Take the inclined surface (95a) of the expansion guide (95) fixedly fixed to the front end of the clamp 90 is extended backward while being pressed to the inner surface of the pipe (A), thereby clamping the pipe (A) is made will be.

After clamping the pipe A with the clamp 90, as shown in FIG. 5C, the rotation motor 84 of the tool post 80 is operated to provide a worm wheel 86b geared to the worm 86a and the worm 86a. By moving the bite holder 82 and the face plate 83 at a low speed by the processing transfer cylinder 72 by operation, the clamp 90, the slide 90, because the clamp 90 is clamped to the pipe (A) The bar 94, the hollow shaft 91, the extension guide 95 and the slider 96 are advanced in the fixed state, the tool post 80 and the mainframe 74 is advanced, the bite 81 of the tool post 80 ) Is to perform the chamfering by rotation close to the end of the pipe (A), which is possible by the hollow shaft 91 is configured to slide on the tool stage 80, the slider when the main frame 74 is advanced Since the sliding guide 75 slides on the slider 96 while the 96 is fixed, the tool post 80 and the main frame 74 are advanced at a low speed. will be.

When the pipe A is chamfered by the bite 81, a guide roller 89 protruding from the lower part of the bite holder 82 is provided by a spring 82a provided on the upper part of the bite holder 82. (A) Since it is chamfered by the bite 81 in fluid contact with the inner surface, it is processed uniformly even if the roundness of the pipe A is distorted, so that uniform chamfering is always performed regardless of the roundness of the pipe A. And, the bite holder 82 is the center of the face plate 83 by a slide screw 87a which rotates by the rotation of the forward and backward drive motor 87 on the guide rail 88 fixed to the face plate 83 and Since it can be moved to the edge, it is possible to chamfer the end of pipe A of various apertures.

After the chamfering is completed automatically by the above operation, the bite 81 is first retracted so as to leave the pipe A end, and then the rod 93 of the clamping cylinder 92 is advanced to slide bar 94. After advancing, this causes the clamp 90 to move forward in the expansion guide 95 fixed to the hollow shaft 91 to reduce the clamp 90 to unclamp on the inner surface of the pipe (A), The rod 73 of the processing transfer cylinder 72 is retracted to fully retract the main frame 74 on which the tool post 80 and the clamp 90 are mounted, and the rod of the space maintaining cylinder 98 is completed after the completion of the reverse movement. Advances 99 to advance the slider 96 on the sliding guide plate 97, thereby clamping 90, the slide bar 94, the hollow shaft 91, and the expansion guides fixed to the slider 96. 95) and clamping cylinder 92 to advance so that the distance between clamp 90 and tool post 80 is constant. As a result, the degree of machining of the chamfering does not change from machining to machining as the point where the pipe A is clamped during the next chamfering process is changed.

After the chamfering of one end of the pipe (A) is completed, the rod (69) of the lift cylinder (68) of the lift device (30) is extended to raise the lifting table (61) to lift and lift the pipe (A). In this state, the transfer table 51 of the forward and backward transfer means 50 is moved forward by the transfer cylinder 55, and then the deceleration motor 45 is driven to rotate the turntable 40 180 degrees by the interlocking means 44. Rotate the pipe A to the stopper 28 in the same manner as described above to transfer the pipe A to the stopper 28 rearward, and then the transfer table 51 is lowered to the front and rear pedestals. (10) (20) settles pipe (A), clamps pipe (A) with clamp (90), and then ends on opposite side of pipe (A) using bite 81 of tool rest 80 Just chamfering.

When the chamfering at both ends of the pipe (A) is completed, the elevating table 61 of the lift device 30 is raised, the conveying table 51 is moved forward, and the turntable 40 is rotated 180 degrees to the initial state. After returning, the pipe A is lifted by a separate crane or the like, and a new pipe A, which is to be chamfered, is raised and the above operation is repeated, and the support 13 of the front and rear pedestals 10 and 20 ( 23) Except for replacement, all operations are performed automatically by cylinders and motors, making it easy to set and chamfer according to pipe (A) diameter, reduce risk, and chamfer pipe (A) more quickly. This would be possible.

In addition, the weld bead formed on the inner and outer surfaces when forming the pipe (A) when the pipe (A) is placed in the drive set roller 63 and the set roller (62) installed on the elevating table (61) of the lift device (30) Since the back may contact the clamp 90, the bite 81 of the tool post 80, the guide roller 89, and the like, and uniform chamfering may not be performed, the drive motor 64 is operated to drive the drive settler roller 63. Rotate the pipe (A) by rotating the settling roller 63 and the settling roller 62 is installed so as to freely rotate in front of the elevating table (61) to achieve a uniform chamfering. .

As described in detail above, the chamfering machine 1 for the large-diameter pipe A provided by the present invention includes a pipe A between the front and rear pedestals 10 and 20 on which the pipe A of various diameters is placed. To elevate the pipe A from the upper and lower transfer table 50 and the upper and lower transfer table 50 for sliding the pipe A forward and backward on the lower turntable 40 and the upper portion of the turntable 40 for rotating the plate 180 degrees. By installing a lift device (30) consisting of the lifting means 60, and fixed to the tool post 80 for chamfering the end of the pipe (A) at the rear of the rear pedestal 20 and the pipe (A) at the chamfering The main unit is equipped with a processing device 70 equipped with a clamp 90, and the crane, etc., which was installed and used separately to rotate the large-diameter pipe (A) by automatically operating the various parts by various cylinders and motors. The pipe (A) more quickly ° It can rotate and prevent the safety accident of the operator, and the chamfering work is made more quickly, which greatly reduces the processing time, and it is easy to work, maximizing the convenience of use, and can increase the efficiency of the work as a whole. It is an invention that the expected effects such as the chamfering at both ends of the pipe A can be performed uniformly and the accuracy of machining can be improved.

Claims (9)

In the chamfering machine (1) for large diameter pipe (A); The chamfering machine 1 is configured to be fixed to the ground, respectively, the front pedestal 10 and the rear support 20, the pipe (A) of various diameters are placed, and It is configured between the front and rear pedestal 10 and the rear pedestal 20, the lower turntable 40 for rotating the pipe (A) by 180 degrees and the front and rear conveying to slide the pipe (A) back and forth on the top of the turntable 40 A lift device (30) consisting of elevating means (60) for elevating pipe (A) up and down at the top of the means (50) and the front and rear conveying means (50); A processing apparatus 70 configured at the rear of the rear stand 20 and equipped with a tool post 80 for chamfering the end of the pipe A and a clamp 90 for fixing the pipe A when chamfering. Chamfering machine for large diameter pipe comprising a. The method of claim 1; The front and rear pedestals 10 and 20 are configured to symmetrically couple the coupling holes 12 and 22 having the coupling holes 12a and 22a formed on the upper portions of the lower supporters 11 and 21, and the left and right coupling holes. The coupling rods 13a and 23a in the lower part of the support 13 and 23 for supporting the pipe A to the 12a and 22a are configured. The rear pedestal 20 has a stopper cylinder 24 having a rack gear 26 installed thereon at the end of the rod 25 and is fixed to the pinion gear 27 geared to the rack gear 26. A chamfering machine for large diameter pipes, characterized in that the stopper 28 is configured to angularly move vertically and horizontally by expansion and contraction of the stopping cylinder 24 by installing the shaft 28. The method of claim 1; The turntable 40 is fixed to the support shaft 43, which is supported by the bearing 42 to the supporter 41 fixed to the ground, and installs several wheels 46 in the lower radial, The support shaft 43 is connected to the reduction motor 45 by an interlocking means 44 composed of a chain and a sprocket, The chamfering machine for large diameter pipes, characterized in that configured to rotate freely along the annular guide rails 47 fixed to the ground by 180 ° according to the operation of the reduction motor 45. The method of claim 1; The front and rear conveying means 50 is a guide bracket in which the packing 54 pressurized by a pair of linear guide rails 52 fixed to the upper side of the turntable 40 and pressure bolts 54a fixed to the other side is embedded. 53, a pair of feed rollers 52a connected to and supported by the linear guide rails 52 at the upper portion thereof constitute the feed table 51 provided at one side thereof. The transfer table 51 is connected to the end of the rod 56 of the transfer cylinder 55 fixedly installed on the turntable 40 so that the transfer table 51 is moved back and forth by the telescopic operation of the transfer cylinder 55. Chamfering machine for large diameter pipes. The method of claim 1; The lifting means 60 is provided with a pair of settling roller 62 and the drive settling roller 63 is freely rotated, respectively, before and after the top of the elevating table 61, the pipe (A), drive settling roller ( 63) drive motor 64 is connected to the drive means 65 of the chain and sprocket, The first lifting lever 66a and the second lifting lever 66b, which are angularly moved in an 'X' shape, around the pivot shaft 66 between the lifting table 61 and the lower transfer table 51, respectively, from side to side. Install one pair, One end of the first lifting lever 66a is fixedly installed on the transfer table 51 so as to be rotatable, and the other end is provided with a rolling roller 67a which is guided back and forth in contact with the lifting table 61. One end of the second lifting lever 66b is fixed to the lifting table 61 so as to be rotatable, and the other end is provided with a rolling roller 67b which is brought into contact with the transfer table 51 and guided back and forth. The end of the rod 69 of the lift cylinder 68, one end of which is pivotally installed on the transfer table 51, on the support bracket 69a, which is fixed at both ends to the left and right first lifting levers 66a at the upper part of the rotation shaft 66. Chamfering machine for large diameter pipe, characterized in that the connection configuration. The method of claim 1; The processing device 70 has an end portion of the rod 73 of the processing transfer cylinder 72 installed so that one end is pivoted on the lower mount 71 to the main frame 74 provided with the tool rest 80 and the clamp 90. The main frame 74 is fixed, but the main frame 74 is chamfering machine for large diameter pipes, characterized in that configured to slide back and forth by the expansion and contraction operation of the processing transfer cylinder 72 in the sliding guide 75 fixed to both sides of the mounting table (71). . The method of claim 1; The tool post 80 is fixedly installed in the upper front of the main frame 74, A face plate 83 which is rotationally driven by a rotational motor 84 fixed to one side of the casing 80a, A bite holder 82 conveyed to the center and the edge of the face plate 83, A chamfering machine for large diameter pipes, characterized in that it comprises a bite (81) mounted to the bite holder (82) for chamfering the end of the pipe (A). The method of claim 7; The bite holder 82 is configured to be coupled to the slide screw (87a) rotated by the drive of the forward and reverse drive motor 87 to ride the guide rail 88 fixed to the face plate 83 and the center and the edge of the face plate 83 To slide into, A chamfering machine for large-diameter pipes, characterized in that the lower portion of the bite holder 82 is installed to protrude forward by a guide roller 89 having a tension up and down by a spring 82a. The method of claim 1; The clamp 90 is a hollow shaft 91 is configured to penetrate the center of the casing (80a) of the tool post 80 to slide back and forth, The clamp 90 is fixed to the front end portion, the slide bar 94 is inserted into the hollow shaft 91 and configured to slide back and forth by the appearance of the rod 93 of the clamping cylinder 92, An expansion guide (95) fixedly installed to have a slanted surface (95a) inclined forwardly at the front end of the hollow shaft (91), The clamping cylinder 92 is configured to be fixed to the rear, it is settled in the sliding guide plate 97 fixed to the upper rear of the main frame 74, the slider 96 configured to slide back and forth by the expansion and contraction operation of the space maintenance cylinder (98). Chamfering machine for large-diameter pipe, characterized in that it comprises a).

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