JPH06315842A - Auxiliary holding device for steel pipe machining - Google Patents

Abstract

PURPOSE:To surely hold even a short material by shift controllably supporting an auxiliary feeding device suspending a feed drive mechanism on a height lift controllable holding frame, and holding a steel pipe with a clamp device provided at the tip of the auxiliary feed device. CONSTITUTION:A steel pipe machining device capable of concurrently beveling and cutting a steel pipe W uses the right and left direction at the center section of a suspension frame as a feed passage, and an auxiliary holding device 4 holding a short work in the suspending state is provided on the upstream end section of the feed passage. The auxiliary holding device 4 supports an auxiliary feed device 5 on a travel guide frame provided on a holding frame screwed to a lift screw rotated by a lift motor 44 to adjust height, and the auxiliary feed device 5 is made movable between the waiting position (a) and the holding position (d) by the rotation of a worm 48 via a worm gear 48a. An expandable clamp device 56 made of a triple-piston structure is provided at the tip of the rod-like feed frame 50 of the auxiliary feed device 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary holding device capable of holding a short work material in a steel pipe working device for cutting or groove-cutting a steel pipe.

[0002]

2. Description of the Related Art In the case of cutting a steel pipe w into a predetermined size, the steel pipe w is supplied to a material feeding passage, and both ends of the steel pipe w are held by holding devices on both sides of a front and rear conveyor to cut the pipe. Processing is applied.

[0003]

By the way, there is no problem when the steel pipe has a long shape that can be held by the holding devices on both sides, but the length is shortened due to the cutting process,
Or when cutting into a short shape, it becomes impossible to hold by one of the holding devices, and it is impossible to firmly hold,
Losing the cutting pressure makes it impossible to perform good cutting work.

Similarly, various steel pipe processing apparatuses, such as a processing apparatus for forming a groove on the end surface of a processed material, have similar technical problems.

The present invention aims to solve such technical problems.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a rotary shaft is rotatably supported at a predetermined angle by a rotary control means on a holding frame attached to a material feeding passage so that its height can be controlled to be raised and lowered. Then, the traveling guide frame is fixed to the lower end of the rotating shaft, and a feed drive mechanism for supporting and feeding the ceiling surface of the steel pipe is provided in the rod-shaped material feeding frame, and at the tip of the rod-shaped material feeding frame. ,
Inside the steel pipe, an auxiliary material feeding device provided with a clamp device that presses against both side surfaces of the steel pipe and holds the steel pipe is supported by the traveling guide frame so that movement can be controlled in the longitudinal direction by the linear traveling control means. It is an auxiliary holding device for a steel pipe processing device characterized by the above.

[0007]

In the standby state of the auxiliary holding device, the auxiliary material feeding device supports the auxiliary material feeding device along the width direction of the processing device so that the auxiliary material feeding device does not interfere with the processing of normal long material. When using the auxiliary holding device, the steel pipe is previously supplied to the inlet position of the material feeding passage, the rotation control means is driven, and the auxiliary material feeding device is set to a position along the material feeding passage. Further, the linear traveling control means is driven to extend the auxiliary material feeding device, the clamp device is inserted into the steel pipe w, and then the height of the holding frame is adjusted to support the point upper surface of the steel pipe w on the feed drive mechanism. To do. Then, the feed drive mechanism is driven to advance the steel pipe w, and the front end thereof is set to the position advanced by a predetermined cutting dimension from the cutting position. When the position is determined, the clamp device is driven to hold the inner surface of the steel pipe w and perform a predetermined process.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a groove processing device to which the present invention is applied will be described with reference to the accompanying drawings.

In the conventional construction, the groove processing is performed after the cutting processing of the steel pipe w, but in the present embodiment,
The present invention is applied to a groove processing apparatus capable of performing such groove processing together with cutting of the steel pipe w.

Reference numeral 1 denotes a mounting frame, which has a material feed passage 2 in the left-right direction of its central portion, and a front conveyor 23, an intermediate conveyor 24, and a rear conveyor 25 which define the material feed passage 2.
Are arranged in a continuous manner.

The front conveyor 23 and the rear conveyor 25
The holding devices 3a and 3b for the steel pipe w are disposed on the top. Further, along the material feeding passage 2, an auxiliary holding device 4 for holding the short work material in a suspended state, a profile cutting device 6 and the like are provided.

Here, the front conveyor 23 and the rear conveyor 25
Is a plurality of rotating rollers 23a, as shown in FIGS.
25a is supported by supporting frames 23b and 25b, and the rotating rollers 23a and 25a are linked to each other so as to be driven in one direction by gear trains 23c and 25c via idler gears. Alternatively, the rotary rollers 23a and 25a are synchronously driven by using the power source of the receiving side conveyor. And the front conveyor 23,
As will be described later, an operation gap is formed between the rear conveyors 25 so that cutting work can be performed, and the intermediate conveyor 24 is disposed in the operation gap so as to be retractable.

This intermediate conveyor 24 also includes a plurality of rollers 2.
4a is supported by a support frame 24b. The support frame 24b is supported by a rod of a hydraulic cylinder 24c whose rear end is pivotally supported by the support frame 25b, and the rear conveyor 2
5, the connecting link 24 is attached to the shaft of the rotating roller 25a at the forefront.
supported via d. Then, due to the rod contraction of the hydraulic cylinder 24c, the intermediate conveyor 24 is retracted from the working gap as shown by the chain line in FIG.

Next, the structure of the holding devices 3a and 3b is shown in FIG.
It will be described according to 2, 3, 5, and 6.

Front and rear elevating frames 12a and 12b are formed by fitting both side ends to elevating guides 11 and 11 formed at the front and rear positions, respectively, on the opposing inner side surfaces of the side plates 1a and 1a of the mounting frame 1. Are each supported. As shown in FIG. 9, the lifting screw 13a,
13a is screwed in the vertical direction, and a bevel gear formed at the end of a linking shaft 16a across the width direction is driven by a lifting / lowering motor 15 with a speed reducer mounted on the upper surface of the mounting frame 1; By engaging with the bevel gears on the upper ends of the screws 13a, 13a, the lifting motor 15 rotates the lifting screws 13a, 13a to control the lifting of the front lifting frame 12a. This lifting motor 15
As will be described later, it also serves as a drive source for controlling the elevation of the elevating plate 14 on which the rotary annulus 60 is mounted. In addition, this lifting plate 1
In No. 4, the gear ratio is adjusted so that the amount of elevation is half that of the front elevation frame 12a.

Similarly, the rear lifting frame 12b is shown in FIG.
As shown by 4 and 6, the lifting screws 13b, 13b are screwed in the vertical direction, and the end of the linking shaft 16b which is driven by the lifting motor 17 with a reduction gear mounted on the upper surface of the mounting frame 1 and extends across the width direction. Bevel gears formed on the upper part and the lifting screw 1
By engaging with the bevel gears on the upper ends of 3b and 13b, the lifting motor 17 causes the lifting screws 13b and 13b.
Is rotated to control the lifting and lowering of the rear lifting frame 12b. The elevating motor 17 is driven synchronously with the elevating motor 15, so that the front elevating frame 12a and the rear elevating frame 12b are substantially interlocked with each other.

Front lifting frame 12a, rear lifting frame 1
As shown in FIG. 6, hydraulic cylinders 30a and 30b, in which tread plates 31a and 31b that are in pressure contact with the upper surface of the steel pipe w are fixed to rods, are fixed to 2b.

On both sides of the lower parts of the tread plates 31a, 31b, the mounting bases 33a, 33 fixed to the mounting frame 1 are mounted.
a, 33b, 33b, and the mounting tables 33a, 33
The pressure bodies 34a, 34a, 34b, 34b that are movable in the width direction are arranged by the guides on the a, 33b, 33b. The pressing bodies 34a, 34a, 34b, 34b
Is a linkage mechanism 36 by the motors 35a and 35b with reduction gears.
They move closer to each other synchronously via a and 36b.

Thus, the tread plate 31a, the pressing members 34a, 3
The holding device 3a is configured by 4a and the like, and the tread plate 31b,
The holding device 3b is composed of the pressure members 34b, 34b, etc., and as described later, the steel pipe w transferred on the conveyors 23 to 25 has pressure members 34a, 34a, 34b, on both sides thereof.
The steel pipe w is held on the front conveyor 23 and the rear conveyor 25 by being clamped by 34b and being pressed on the upper surfaces by the pressure plates 31a and 31b.

Incidentally, there is no problem when the steel pipe w is in a long state extending over the front conveyor 23 and the rear conveyor 25, but in the case where the steel pipe w is shortened or cut into a short shape due to the cutting process. As described above, with the intermediate conveyor 24 retracted, both ends of the steel pipe w are moved to the front conveyor 2
3. A state in which it is not supported by the rear conveyor 25 occurs, and it becomes impossible to hold it.

Therefore, the auxiliary holding device 4 according to the present invention is suspended from the front lifting frame 12a. The configuration will be described with reference to FIGS.

A holding frame 43 is attached to a front surface of a mounting piece 41 fixed to the front elevating frame 12a so as to be vertically movable via a guide 42. This holding frame 43 is
The height is controlled along the guide 42 by being engaged with a vertically moving up-and-down screw 45 which is rotated by an up-and-down motor 44 supported by the mounting piece 41, and guided by the rotation of the up-and-down screw 45. . A rotation shaft 46 is rotatably supported at the front portion of the holding frame 43, and the lower end of the rotation shaft 46 is
A traveling guide frame 47 having a U-shaped cross section is fixed, and the auxiliary feeding device 5 is supported by the traveling guide frame 47.

The worm gear 4 is attached to the rotary shaft 46.
The worm 48b fixed to the drive shaft of the rotary motor 49 fixed to the front surface of the holding frame 43 is engaged with the worm gear 48a to rotate the rotary shaft 46 by 90 degrees. Therefore, the auxiliary material feeding device 5 supported by the rotating shaft 46 moves between the two positions of the standby position B and the holding position D in FIG.

On the other hand, the auxiliary material feeding device 5 includes a drive sprocket 51 in a rod-shaped material feeding frame 50 having a U-shaped cross section.
The driven sprocket 52 is supported at both ends, the endless transport chain 53 is hung over the sprockets 51 and 52, the drive sprocket 51 is configured to be linked with the drive motor 54, and the drive motor 54 is driven to drive the endless drive chain. The transport chain 53 is made to run. Further, a clamp device 56 having a triple piston structure and having a large width difference between the contracted position and the projected position is fixed to the tip of the rod-shaped material feeding frame 50.

The auxiliary feeding device 5 is supported in the traveling guide frame 47 so as to be movable in the longitudinal direction. That is, the sliding guides 55, 55 are provided on both side surfaces of the rod-shaped material feeding frame 50.
Are projected along the longitudinal direction, and these sliding guides 55, 55
Is fitted in a guide groove formed on the inner side surface of the traveling guide frame 47 and is movable in a linear direction. Further, a rack 57 is provided on the side surface of the rod-shaped material feeding frame 50 in parallel with the sliding guides 55, 55, and is fixed to the shaft of a transfer motor 59 attached to the rod-shaped material feeding frame 50 on the rack 57. By screwing the pinion 58, the auxiliary material feeding device 5 can be moved linearly in the travel guide frame 47. This movement control is performed by detecting the limit switch LS provided on the rack 57 in the travel guide frame 47.

When the auxiliary feeding device 5 is in the standby position (i) and the central portion of the auxiliary feeding device 5 is supported by the traveling guide frame 47 and the steel pipe w is held as described later, In order to enable the rotation of the auxiliary material feeding device 5, the clamp device 56 is set to a retracted position, and further, at the holding position b, the position can be converted to the maximum extension position of the clamp device 56. .

Next, the configuration of the copy cutting device 6 is shown in FIGS.
Will be explained.

A rotary ring body 60 is rotatably supported by the elevating plate 14 behind the holding device 3a. That is, a circular hole 14a is formed in the elevating plate 14 so as to surround the material feeding passage 2, a rotary ring body 60 is disposed in the circular hole 14a, and a plurality of circular holes 14a are supported on the inner peripheral edge of the circular hole 14a. The supporting roll 61 supports the rotating ring body 60.
A gear 62a is provided in the circular hole 14a on the outer peripheral surface of the rotary ring body 60. The gear 62b fixed to the drive shaft of the rotary motor 63 is meshed with the gear 62a to rotate the rotary motor 63. The ring 60 is rotated half a turn.

On the rotary ring body 60, two pieces of swing arms 65 supported by a swing shaft 64 are supported at point symmetrical positions. Then, the mounting shaft 66 of the rotary blade 9 is supported by the end of the swing arm 65, and the rotary shaft 9 is rotated by linking the mounting shaft 66 with the cutting motor.

On the other hand, the swinging arm 65 has a mounting shaft 6
One end of the pivot arm 70 is supported at a position concentric with the shaft support arm 6. The shaft guide arm 70 has linear guides 7 formed on both side surfaces thereof.
Bearing pieces 73 are fitted on the linear guides 1 and 71.
By screwing the bearing piece 73 on the feed screw 72 supported along 1, 1, 71, the feed action of the feed screw 72 allows the bearing piece 73 to move along the linear guides 71, 71. In addition, a copying roll 80, which is pressed against the side surface of the steel pipe w and rotates in a copying manner, is pivotally supported on the bearing piece 73 so as to freely rotate. Then, a bevel gear fixed to the end portion of the feed screw 72 is supported on the side surface of the shaft support arm 70 to form a short link shaft 74.
It is screwed to the bevel gear. The linking shaft 74 is pivotally supported by an interlocking shaft 75a having a spiral groove formed in the axial direction.

Further, a mounting frame 79 supports, on the swing arm 65, a cutting depth adjusting motor 77 composed of a servo motor, and a linking shaft 78 meshing with a drive shaft of the adjusting motor 77 via a gear. The interlocking cylinder 75b is fitted onto the interlocking shaft 75 and is capable of relative axial movement by meshing with the spiral groove.
Is pivotally attached to the other end. This interlocking shaft 75a, interlocking cylinder 75
The elastic joint b is formed with b.

With such a structure, the cutting motor 68
When the drive shaft is driven, the linkage shaft 78, the elastic shaft joint 75 and the linkage shaft 74 rotate, and the rotation of the feed screw 72 causes the bearing piece 7 to rotate.
3 moves along the linear guides 71, 71, the position of the support shaft 81 of the copying roll 80 changes, and the amount of deviation from the rotary blade 9 can be adjusted. Further, due to the bending action of each pivot portion and the expansion and contraction operation of the elastic shaft joint 75, relative displacement with respect to the shaft support arm 70 and the frame 79 becomes possible.

A tip of a rod 86 of a hydraulic cylinder 85 which is tiltably supported on the rotary annulus 60 is pivotally supported on the swing arm 65, whereby the swing arm 65 is supported by the swing shaft 6.
Tilt around 4. The urging force of the hydraulic cylinder 85 causes the copying roll 80 to come into pressure contact with the side surface of the steel pipe w.

On the other hand, as shown in FIG. 12, the rotary blade 9 has a plurality of grooved tip blades 91 and cutting tip blades 92 fixed to a rotary blade base 90 having a tip with a conical cross section. Consists of That is, the inclined surface 93 of the blade base 90 is formed with a plurality of blade mounting grooves 94, and the groove tip blade 91 made of a throwaway tip or the like is screwed and fixed to the blade mounting grooves 94. This groove tip chip 9
No. 1 interferes in the radial direction, and one of the groove tip blades 91 takes a cutting role over the radial direction of the inclined surface 93 so as to cut the steel pipe w in an inclined shape as described later and cut it. Accordingly, the end face of the steel pipe w is grooved. A cutting tip blade 92 is fixed to the tip of the blade base 90.

The rotary blade 9 is fixed to the swing arm 65 by inserting the mounting shaft 66 into a mounting hole 98 formed at the center of the blade base 90.

In the above structure, each operation is automatically controlled by the central control unit CPU (not shown).

Further, the steel pipe w applied to the groove processing device having such a constitution is composed of a square cross section of 200 to 750 square and is usually cut to a length of 0.1 to 16 m.

Next, the operation of this structure will be described.

<Supply and Hold of Steel Pipe w>

A steel pipe w having a rectangular cross section is placed on a supply conveyor (not shown), and the size of the steel pipe w, the plate thickness, and the rotation angle of the rotary annulus 60 are set by an input device connected to the central control unit CPU.

Next, from the supply conveyor to the front conveyor 23
When the steel pipe w is fed to the front end, it is fed forward by the driving of the rotating rollers 23a and 25a, and the feed drive is stopped at the position moved by the predetermined cutting dimension from the cutting position. Conveyor 24, rear conveyor 2
Supported on 5. This stop position is determined by length measuring means such as detecting the edge of the steel pipe w with a limit switch.
Can be easily set.

In order to enable the supply of the steel pipe w, the hydraulic cylinder 85 of the profile cutting device 6 is previously prepared.
The rod is in the retracted position, and as shown in FIG. 15, the swing arm 65 is in the retracted position along the circumferential direction of the rotary ring body 60. In this state, the rotary blade 9 is naturally retracted. At the same time, one end of the shaft support arm 70 is supported by the shaft support arm 70 concentric with the profile cutting device 6 and the other end is supported by the interlocking shaft 75, so that the profile support roll 70 is in a suspended state. Also, the support shaft 81 is retracted at a position offset to the outside of the mounting shaft 66 of the rotary blade 9. Therefore, the material feeding passage 2 is secured and the steel pipe w can be supplied.

At this position, the motor 35 with reduction gear
a, 35b actuate, and the pinching bodies 34a, 34a, 34b, 34b move in the approaching direction via the linking mechanisms 36a, 36b to pinch both side surfaces of the steel pipe w. Furthermore, the lifting motors 15 and 17 with reduction gears drive the lifting screws 13a,
The front lifting frame 12a and the rear lifting frame 12b are lowered by the feeding action of 13b, the tread pressure plates 31a and 31b come into contact with the steel pipe w, and the hydraulic cylinders 30a and 30b are actuated to step on the tread pressure plates 31a and 31b. Pressure is generated.
As a result, the steel pipe w is held in the front and rear portions of the holding devices 3a and 3b, respectively.
Will be held by. At this time, the lifting plate 14 is lowered by half along with the front lifting frame 12a, and the center of the rotary ring body 60 and the center of the steel pipe w are substantially aligned.

After this holding, the rod of the hydraulic cylinder 24c contracts, so that the intermediate conveyor 24 tilts about the axial position of the rotating roller 25a at the forefront of the rear conveyor 25 as shown by the chain line in FIG. 23, retracted from the working gap between the rear conveyor 25.

When the steel pipe w is long as described above,
Holding devices 3a, 3 on the front conveyor 23 and the rear conveyor 25
Although it is held by b, when the supplied steel pipe w is a short material or has a short cutting length, it is held by the following means.

<Supply and Hold of Short Steel Pipe w>

When a short material which cannot be held at both ends by the front conveyor 23 and the rear conveyor 25 is applied or the cutting length is short, the auxiliary holding device 4 according to the present invention is used.

That is, the steel pipe w is mounted on the front conveyor 23 in advance. In the standby state of the auxiliary holding device 4, the auxiliary feeding device 5 is supported in the widthwise direction at substantially the center thereof, as shown in position b in FIG. The motor 59 is driven, and the clamp device 56 is operated by the action of the rack 57 and the pinion 58.
This is the position where B was retracted. Next, the rotary motor 49 is driven to the position c, the transfer motor 59 is further driven to extend the auxiliary material feeding device 5, and the clamp device 56 is inserted into the steel pipe w to be the position d. To raise the holding frame 43 along the guide 42, and the steel pipe w
The ceiling surface is supported on the endless transport chain 53 of the auxiliary material feeding device 5. The linear traveling control of the auxiliary material feeding device 5 is performed by the limit switch LS provided on the rack 57 as described above.
Can be easily performed by detecting in the travel guide frame 47.

Then, the steel pipe w is advanced as described above, and the front end of the steel pipe w is supported by the intermediate conveyor 24 to a position advanced by a predetermined cutting dimension from the cutting position. This positioning is also automatically determined by means such as detecting the front end of the steel pipe w by a limit switch as described above.
With this position determination, the clamp device 56 is driven to extend the rods on both sides, and the rod ends are brought into pressure contact with the inner surface of the steel pipe w, whereby the holding device 3a or the holding device 3b acts on the steel pipe w. Even if it does not, it is held by the clamp device 56.

After this holding, the rod of the hydraulic cylinder 24c contracts, so that the intermediate conveyor 24 tilts about the axial position of the rotary roller 25a at the forefront of the rear conveyor 25 as shown by the chain line in FIG. 23, retracted from the working gap between the rear conveyor 25.

This auxiliary holding device 4 is useful not only for the short steel pipe w but also for a case where the processing dimension is short and the tip does not reach the rear conveyor 25.

<Cutting of steel pipe w>

When the steel pipe w is positioned as described above, the center of the steel pipe w and the center of the rotary ring body 60 are substantially aligned with each other as the elevating plate 14 descends. Further, in this holding state, the rod of the hydraulic cylinder 85 of the copying cutting device 6 is in the contracted position, and the rotary blade 9 and the copying roll 80 are in the retracted position.

In this state, when the cutting motor 68 is driven to rotate the rotary blade 9 and the hydraulic cylinder 85 is driven to extend the rod, the copying roll 80 is circumscribed on the side surface of the steel pipe w. The tip of the rotary blade 9 is pressed against the side surface of the steel pipe w, and the cutting tip blade 92 is moved by the rotation of the rotary blade 9 and the pressure of the hydraulic cylinder 85.
12, and the steel pipe w is cut along the inclined surface 93 by the groove tip blade 91 as shown in FIG.

In this cutting mode, the steel pipe w is cut by the cutting tip blade 92, and the cross section follows the inclined surface 93 by the groove tip blade 91 provided on the cutting tip blade 92. The groove f is formed at different angles. Therefore, the steel pipe w is cut and groove-processed at once by the rotary blade 9, and thus it is not necessary to use two cutting machines and a groove-processing machine as in the conventional case. It is not necessary to re-supply the steel pipe w which is troublesome.

After such cutting, the front conveyor 2 is again operated.
3. The rear conveyor 25 is driven and the steel pipe w is advanced by a predetermined cutting length.

[0057]

As described above, according to the present invention, the auxiliary feeding device 5 for mounting the feed drive mechanism is rotatable and movable in the longitudinal direction on the holding frame 43 mounted so that the height can be controlled to be elevated and lowered. It is controllably supported, and the auxiliary material feeding device 5 is inserted into the steel pipe w and is advanced to a predetermined holding position by a feed drive mechanism, and the clamp device provided at the tip of the auxiliary material feeding device 5 is inserted into the steel pipe w. Then, the steel pipe w can be held by the operation of the clamp device 56. Therefore, even a short work material can be fed and held at a predetermined position, and the steel pipe w can be cut. There is an excellent effect that can be effectively applied to holding a short material of various processing devices involving a feeding process of a steel pipe and a holding process such as working and groove working.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a groove device according to the present invention.

FIG. 2 is a front view showing an auxiliary holding device 4 removed.

FIG. 3 is a front view showing only the auxiliary holding device 4.

FIG. 4 is a plan view.

5 is a sectional view taken along line aa of FIG.

FIG. 6 is a rear view.

7 is a cross-sectional view taken along the line bb of FIG.

FIG. 8 is a right front view of the auxiliary holding device 4.

9 is a side view of the auxiliary holding device 4. FIG.

FIG. 10 is a plan view showing the operation of the auxiliary holding device 4.

FIG. 11 is an enlarged front view of a main part of the copying / cutting device 6.

FIG. 12 is a vertical sectional side view of a rotary blade 9.

[Explanation of symbols]

 2 Material feeding passages 3a, 3b Holding device 4 Auxiliary holding device 5 Auxiliary material feeding device 6 Copy cutting device 9 Rotary blade 12a Front lifting frame 12b Rear lifting frame 14 Lifting plate 15 Lifting motor 23 Front conveyor 24 Intermediate conveyor 25 Rear conveyor 43 Holding Frame 44 Lifting motor 45 Lifting screw 46 Rotating shaft, 47 Traveling guide frame 49 Rotating motor 50 Rod-shaped material feeding frame 53 Endless transport chain 54 Drive motor 56 Clamping device 57 Rack 58 Pinion 59 Transfer motor 60 Rotating ring 63 Rotating motor 65 Swing arm 80 Copying roll

Claims (2)

[Claims] 1. A holding frame mounted so as to be capable of height-elevating control with respect to a material feeding passage, a rotation shaft being rotatably supported by a rotation control means at a predetermined angle so that the rotation shaft can be rotated. A feed drive mechanism for fixing the traveling guide frame to the lower end and supporting and feeding the ceiling surface of the steel pipe is provided on the rod-shaped material feeding frame, and at the tip of the rod-shaped material feeding frame, inside the steel pipe, A steel pipe supporting an auxiliary material feeding device, which is provided with a clamp device for holding the steel pipe in pressure contact with both side surfaces thereof, is supported by the traveling guide frame so that movement can be controlled in the longitudinal direction by linear traveling control means. Auxiliary holding device for processing equipment. 2. A feed sprocket for a feed drive mechanism of an auxiliary feed device, the drive sprocket being driven and controlled by a drive motor supported at both ends of a rod-shaped feed frame, and a driven sprocket.
2. An auxiliary holding device for a steel pipe machining apparatus according to claim 1, wherein the auxiliary holding device is constructed by an endless conveying chain which is hung on the sprocket pair and supports and feeds the ceiling surface of the steel pipe.