JP3005951U - Moving platform moving mechanism in pipe cutting machine - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to a moving mechanism of a movable table on which a work table having a cutting head is mounted in an automatic cutting machine for a relatively large diameter and long pipe supported on a machine table. [Structure] A long track 6 is set in parallel with a pipe to be cut supported on a holding table 5 on a machine base 2, and a wavy tooth profile is formed on a rack 7 arranged along the track 6. A plurality of engaging bodies 8 having circular tooth shapes and maintaining a predetermined phase difference for engaging with the rack 7 are supported by a movable base 11 which moves on the track 6.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a moving mechanism for a movable table on which a work table having a cutting head is mounted in an automatic cutting machine for a relatively large diameter and long pipe supported on a machine table.

[0002]

[Prior art]

 Conventionally, the work table equipped with the cutting head of this type of pipe cutting machine is driven by the rotation of a pinion that meshes with a rack arranged in parallel with the holding table of the pipe to be cut.・ In the case of the pinion mechanism, since the backlash is relatively large, there was a problem in maintaining accuracy when precise and complicated curved cutting was required.

On the other hand, in cutting a relatively long diameter pipe as described above, all movements of a work table equipped with a cutting torch are carried out by precise feeding with almost no backlash. However, there is a problem in that it takes too much time to move the workbench to a predetermined position when it is carried out by means.

[0004]

[Problems to be solved by the device]

 In this invention, first, the movable table is moved rapidly by using a mechanism having almost no backlash, and thereafter, a fine and highly precise worktable is provided on the worktable by the screwing means consisting of a screw rod and a screw cylinder. It is intended to solve the above-mentioned various points by a mechanism for moving the.

[0005]

[Means for Solving the Problems]

 That is, this invention sets a long track parallel to the pipe to be cut which is supported by a holding table on the machine base, and forms a wavy tooth profile on the rack arranged along this track. To propose a movable table moving mechanism in a pipe cutting machine in which a plurality of engaging bodies having circular tooth shapes for maintaining a predetermined phase difference are supported by a movable table moving on the orbit. Is.

[0006]

[Action]

 In the mechanism of the present invention having the above structure, the movable table on which the work table is mounted is moved to the working position by the mechanism of the present invention, and then the screw cylinder is screwed by the rotation of the screw rod. The cutting head provided on the workbench is moved finely and precisely toward a predetermined work location.

[0007]

【Example】

 The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings. 1 to 3, a pipe cutting machine 1 is provided with a machine base 2, a pipe end holding means 3 formed at one end of the machine base 2, and an appropriate space on the machine base 2. A holding base 5 for rotatably supporting a pipe 4 to be cut, the machine base 2, and thus a pair of long lengths set parallel to the pipe 4 over substantially the entire length of the machine base 2. The track 6 and the engaging body 8 meshing with the rack 7 arranged along the track 6 are rotated by the servo motor 9 to move on the track 6 via the wheels 10. The movable table 11 is provided.

Next, an example of a mechanism including the rack and the engaging body that meshes with the rack according to the present invention will be described in detail. That is, in FIGS. 4 to 8, 7 is a rack, and 13A, 13B, 13C are engaging bodies having the same pitch as the pitch P of the tooth 12 of the rack 7.

The tooth T1 of the rack 7 is formed into a tooth profile having a trochoidal curve or cycloidal curve (waveform) as shown in FIG. 7, and the tooth T2 of the engaging bodies 13A to 13C is a circle serving as a reference of this tooth profile. It is formed in an arcuate tooth profile having the same radius R.

The rack 7 is axially movably connected to the case 15 through a plurality of circulation type balls 14, and the rack 7 is attached to both sides of the rack 7. A mating groove 16 is formed, and a ball circulation passage 18 is formed in the bottom 17 of the case 15.

The engaging bodies 13A to 13C are supported by the eccentric cam portions 20a, 20b, 20c of the pair of crankshafts 19A, 19B so that the tooth T2 side faces the rack 7, respectively, and the crankshafts 19A, 19B. Is supported by the case 15 via the pair of bearings 21 and 22, so that the teeth T2 of the engaging bodies 13A to 13C are in contact with the rack 7.

The cranks 19A and 19B have eccentric cam portions 20a to 20c formed at, for example, equal angular intervals, and when the gears 22A and 22B connected to one end sides of the crankshafts 9A and 9B rotate, a plurality of crankshafts are provided. Of the racks 13A to 13C are kept in a predetermined phase difference (in the present embodiment, the active racks 13A to 13C are kept in a predetermined phase difference (in the present embodiment, an equal phase difference of 120 ° corresponding to the number of active racks) is used for the swinging crank motion. Can be made.

An input gear 23 is meshed with the gears 22A and 22B, and the input gear 22 is connected to an input shaft 24 axially supported by the case 15 by a bearing (not shown). One end of the input shaft 24 projects outward from the case 15 and receives a rotary input from this one end.

When the input shaft 24 is rotated by the power from the outside, the input gear 23 is rotated, and the gears 22A and 22B meshing with the input gear 23 are rotated in the same rotation direction, whereby the crankshaft 19A, 19B is driven, and the plurality of engaging bodies 13A to 13C perform a swing crank motion while maintaining a predetermined phase difference.

At this time, as the crankshafts 19A and 19B rotate, the engaging bodies 13A to 13C eccentrically oscillate as shown in, for example, FIGS. The rack 7 which has been pushed is pushed in the direction of arrow X in FIG. Further, since the engaging bodies 13A to 13C perform the swinging crank motion while maintaining a predetermined phase difference according to the number thereof, at least any one of the plurality of engaging bodies 13A to 13C during one rotation of the crank shafts 19A and 19B. One of them comes into contact with the rack 7 on the one surface side of the tooth T1, and the rack 7 is pushed in the direction of the arrow X by the swinging of the engaging bodies 12A to 12C. Therefore, the crankshafts 19A, 19B When the gear rotates once, the engaging bodies 13A to 13C move by one tooth (pitch) of the teeth T1 and T2.

On the other hand, when the rotational input to the input shaft is reversed, the crankshafts 19A and 19B are rotated in reverse, and the rack 7 is pushed in the direction opposite to the arrow X direction. Here, considering the meshing between the rack 7 and the teeth T1 and T2 of the engaging bodies 13A to 13C, the engaging bodies 13A to 13C that give a pressing thrust to the rack 7 are a plurality of teeth T2 arranged along the rack 11 in an appropriate number. Since the rack 7 is pressed by, the pressure applied to each tooth T2 can be small. Therefore, a linear motion mechanism having a large thrust can be realized.

Further, since the crank motion of the engaging bodies 13A to 13C can output one tooth T1 of the rack 7 for one rotation of the crankshafts 19A and 19B, it is necessary to provide a reducer separately. In combination with the fact that the tooth surface pressure is small, a very small linear motion mechanism can be realized.

A screw rod 12 is disposed on the movable base 11 in parallel with the track 6 so as to be rotatable by a servomotor 13, and a screw cylinder 14 screwed to the screw rod 12 is provided. The work table 15 having the above-mentioned means moves on the movable table 11 via wheels 16.

A cutting means 18 including a cutting head 17 is attached to the work table 15 to perform a necessary cutting work on the pipe 4.

The movable table 11 is moved on the track 6 by rotating the pinion 8 meshing with the moving mechanism of the present invention having the above-mentioned structure by the servo motor 9. The work table 15 mounted on the movable table 11 is moved to the vicinity of the cutting point of the pipe 4.

Next, when the screw rod 12 is rotated by driving the servo motor 13, the screw cylinder 14 screwed into the screw rod 12 is advanced, whereby the cutting means provided in the work table 15 is cut. Since 18 reaches the predetermined cutting work position accurately, the pipe cutting work is started while rotating the pipe end holding means 3 in this state.

The work of cutting the pipe is performed by moving the work table 15 and displacing the groove of the cutting head 17 according to a program preset by the computer. The movement of 15 is precisely performed by the forward / backward movement of the screw cylinder 14 caused by the rotation of the screw rod 12.

[0023]

[Effect of device]

 By adopting the above-mentioned mechanism of the present invention, the error due to the backlash of the meshing portion experienced when the cutting head is moved during the pipe cutting work by the conventional rack and pinion mechanism is adopted. It is possible to move the movable table smoothly with extremely high accuracy without using the robot.

[Brief description of drawings]

FIG. 1 is a side view showing a main part of the mechanism of the present invention with a pipe cutting machine partially omitted.

FIG. 2 is a plan view of a portion shown in FIG.

FIG. 3 is a rear view of the portion shown in FIG.

FIG. 4 is a perspective view showing the relationship between the rack and the engaging body of the present invention.

FIG. 5 is a front view of the above portion.

6 is a cross-sectional view taken along the line AA of FIG.

FIG. 7 is an explanatory diagram of a rack shape.

FIG. 8 is an explanatory diagram of its operation.

[Explanation of symbols]

 2 machine stand 5 holding stand 6 orbit 7 rack 8 engaging body 11 movable stand

Claims (1)

[Scope of utility model registration request] 1. A long track is set parallel to a pipe to be cut which is supported by a holding table on a machine base, and a wavy tooth profile is formed on a rack arranged along the track. A movable table moving mechanism in a pipe cutting machine in which a plurality of engaging bodies having circular tooth shapes for maintaining a predetermined phase difference are supported by a movable table which moves on the track.