JPH0739052B2 - Tailstock lowering device in automatic pipe cutting machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a tailstock lowering device in an automatic pipe cutting machine.

[Prior Art] Conventionally, for example, a device shown in FIG. 12 is known as a pipe cutting device for cutting a long steel pipe into a predetermined size in a process of manufacturing a nipple which is one of pipe fittings. ing. In the figure, A is an endless annular conveyor, B is a tailstock attached to the conveyor A, the upper part of which is exposed on the base C, and the surface of the base C moves as the conveyor A advances in the direction of arrow a. Move forward on top. When the tip end surface of the long pipe P, which is held by the holding table D and the pair of holding rollers E, E and rotates in the circumferential direction, comes into contact with the contact member F, the conveyor A is stopped and the holding rollers E, The cutter G, which is disposed opposite to the upper side of E, is rotated and lowered to cut the long pipe P into a predetermined length l, and the cut pipe ΔP, that is, the product is held by the holding rollers E and E. By rotating the cutter G in the radial direction, the cutter G is raised and retracted, and then the conveyor A is moved forward. Thereafter, the long pipe P is sequentially moved to a predetermined length l by repeating the above operation. It is configured to cut and obtain the product.

[Problems to be Solved by the Invention] By the way, in the conventional pipe cutting device, the tailstock B is
Starts pushing the long pipe P from the starting position P ₁ to the conveyor A
At the same time as moving to the end position P _{2 and} when the cutting of the long pipe P is completed, the conveyor A is reversed and the tailstock B is not retracted and returned to the starting end position P ₁ until the next long pipe is reached. Set P on the holding table D and the holding roller E,
Unable to get ready for cutting.

That is, there is a disadvantage that productivity is inferior because the cutting work must be interrupted every time the cutting of the long pipe P is completed.

Therefore, the conveyor A is moved only in the feeding direction, and at least one pair of tailstocks B are attached to this conveyor at equal intervals, and long pipes P are sequentially fed between the tailstocks to push the pipe P forward. However, it is conceivable to improve the productivity by eliminating the waste of having to interrupt the cutting operation every time the cutting of the long pipe is completed while the cutting is performed.

However, with this configuration, in the process in which the tailstock B reaches the position shown by the solid line in FIG. 13 and moves from here to the position shown by the imaginary line, the tailstock B gradually decenters and pushes in the direction of pushing. The end of the pipe P is pressed while tilting to.

Since the pipe P is rotated in the circumferential direction by the holding roller E, it is naturally preferable to press the tailstock B in a concentric manner. When the pipe P is gradually eccentric with respect to and is pressed in a tilting direction, the rotation of the pipe P becomes uncertain.

On the other hand, the wear of the cutting edge that affects the cutting performance of the pipe cutter G, that is, the settling of the cutting edge, can be suppressed by reliably rotating the pipe P, whereby the life of the pipe cutter G can be extended. Has been done.

However, the rotation of the pipe P becomes uncertain for the above-mentioned reason,
In this state, when the advance of the pipe P is temporarily stopped and the cutting process is started, the pipe cutter G becomes significantly flattened and the cutting performance is deteriorated. It becomes a state. Therefore, the frequency of replacement of the pipe cutter G is increased, the productivity is significantly reduced, and there is a problem that leads to an economical disadvantage.

The present invention has been made in view of the above circumstances, and it is possible to eliminate the waste of interruption of the cutting work, enable continuous cutting, and realize a great improvement in productivity, and of course, the tailstock head at the end of the conveyor. The pipe can be lowered to release the pressure at the end of the pipe by the tailing head, avoid uncertain rotation of the pipe, extend the life of the pipe cutter, improve productivity and realize economic advantage. The purpose of the present invention is to provide a tailing device lowering device for the automatic cutting machine.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention comprises a feed mechanism composed of an endless annular conveyor, and at least one pair of tailstocks having tailstocks capable of moving up and down are provided on the conveyor. It is attached to the tailing head holding rail for holding the tailing head at a position where the end surface of the pipe can be pressed from the upstream end portion to the downstream end portion of the conveyor, and is formed at the downstream end portion of the tailing head holding rail. The tailing head is provided with a lowering guide portion for lowering the tailing head to a position separated from the end surface pressing position of the pipe.

[Operation] According to the present invention, the tailstock head holding rail holds the tailstock head of the tailstock at a level at which it can concentrically abut the end surface of the pipe, and pushes the long pipe forward. You can

Further, since the tailing head can be rapidly lowered at the end portion of the conveyor by the lowering guide portion to release the pressing of the tail end of the pipe by the tailing head, the pipe can be reliably rotated during the cutting process, and Suppress.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic side view showing an overall configuration of an automatic pipe cutting machine to which the present invention is applied, and FIG. 2 is a plan view of the same. In these drawings, the automatic pipe cutting machine 1 shows a long pipe P. A feed mechanism 2 for sequentially arranging them in a straight line and intermittently moving in the axial direction, and a holding rotation for holding and rotating a lead-out portion of a pipe P fed into the guide barrel 3 by the feed mechanism 2 and led out from the guide barrel 3. Roller 4 and this holding rotation roller 4
And a pipe cutter feed mechanism 6 that cuts the pipe P by reciprocating the pipe cutter 5 when the axial movement of the pipe P is stopped.

The feed mechanism 2 is composed of an endless annular chain conveyor attached to a frame 21, and has a pair of tailstocks 22 at equal intervals.
A and 22B are attached and both tailstocks 22A and 22A, by moving horizontally along the frame 21 by the operation of the conveyor.
The tailstock heads 22a and 22b attached to the respective 22B press the end surface of the long pipe P.

In addition, there is a predetermined interval between the tailstocks 22A and 22B.
A pair of holding bases 23A and 23B are attached, and long pipes P sequentially sent out one by one from a pipe stocker 21A which is arranged adjacent to the side of the frame 21 are rotatably held horizontally. The pipe P has its axis C ₁ oriented in the feed direction (arrow x1) of the feed mechanism 2 and is set to a predetermined height, that is, concentric with the axis of the tailstock heads 22a, 22b.

The guide tube 3 is formed of a tube body having openings at both ends arranged on the downstream side of the feed mechanism 2 on the extension of the axis C ₁ of the long pipe P horizontally held by the holding tables 23A and 23B. The axis C ₂ is fixed on the extension 71 extending from the rear side of the upper end, and its axis C ₂ is set concentrically with the axis C ₁ of the long pipe P horizontally held by the holders 23A and 23B. .

The holding and rotating roller 4 is incorporated in the extending portion 71 of the box-shaped frame 7 and is arranged at a position immediately downstream of the guide cylinder 3, and holds a partial circumference of the pipe led out from the guide cylinder 3 at, for example, three points. To give circumferential rotation to the pipe.
As shown in FIGS. 4 and 5, a rotation drive source (not shown)
By a pair of left and right rollers 4A, which rotate in the direction of arrow x2, x2
It is composed of 4B.

The pipe cutter 5 shown in FIGS. 1 and 2 is composed of a disc cutter, and is provided above and above the holding and rotating roller 4. That is, the pipe cutter 5 is detachably fixed to the output shaft 52 protruding from the box 51.
The input shaft 53 is connected to a drive motor 55 via a coupling 54, and is rotationally driven by the drive motor 55. The drive motor 55 is swingably mounted on the box-shaped frame 7 via bearings 72, 72.
The box 51 is mounted on the other side of the swing base 8.

The pipe cutter feed mechanism 6 has a cylinder 61 arranged inside the box-shaped frame 7 and one end thereof connected to the tip of a piston rod 62 of the cylinder 61 as shown in FIG. It is composed of a lever 63 pivotally supported by a lever, and a vertical connecting member 64 connecting the other end of the lever 63 and the swing base 8.

In FIGS. 1 and 2, reference numeral 9 denotes a hitting member, which has a function of a stopper with which the cut surface of the long pipe P comes into contact, and as shown in FIGS. 5 to 7, a box-shaped frame. On the front side of the upper end of the other side surface of 7, the swing member 92 is hinged by a pin 91. Then, the contact member reciprocating mechanism 10 constituted by a cylinder interposed between the front end surface of the box 51 and the rocking tip of the rocking member 92 is actuated to cut the hitting member 9 as shown by the solid line in FIG. It reciprocates between the length setting position and the retracted position indicated by a virtual line.

In FIG. 1 and FIG. 2, reference numeral 11 denotes a guide member, and a cylinder 11B which is attached to the front end of the pipe stocker 21A so as to extend to the upper side of the frame 21 via the bracket 11A,
A steady plate 11C that moves up and down by the operation of this cylinder 11B and comes into contact with the pipe when descending to prevent the pipe from swinging.
It consists of and. That is, as shown in FIG. 9, the end portion ΔPa of the forward pipe PA and the start portion ΔPb of the next pipe PB, which have already been sequentially cut to a predetermined length and are sent forward, are respectively guided by the guide cylinder. Until it is fed into 3, the precession preventing plate 11C is brought into contact with the upper surfaces of the terminal end portion ΔPa and the starting end portion ΔPb to prevent relative center runout of both pipes PA and PB.

In FIGS. 1 and 2, reference numeral 12 is a drive source, which is composed of a motor mounted on a base 12A attached to the front end of the pipe stocker 21A, and which has an output shaft 12a and an input shaft 24 of the feed mechanism 2. A power disconnecting mechanism 13 is provided between them. In the power connection / disconnection mechanism 13, the cut surface of the pipe hits the member 9
When the load of the feed mechanism 2 that is in contact with the pipe is high, the power transmission from the output shaft 12a to the input shaft 24 is cut off to stop the feed mechanism 2, and the contact member 9 does not contact the end surface of the pipe. When the load is low, it is configured by a mechanism for transmitting power from the output shaft 12a to the input shaft 24 to operate the feeding mechanism 2, for example, a magnetic powder clutch.

In FIG. 3 and FIG. 4, 14 is a protrusion guide member,
Reference numeral 15 indicates a shutter. The protrusion guide member 14 is a curved claw provided on the first locus FL1 in which the pipe cut by the pipe cutter 5 is blown by the cutting force (rotational force) of the pipe cutter 5 and the rotation force of the holding rotation roller 4. Made of metal in the shape of a box, the tip of which is located behind the pipe cutter 5 and closer to the holding and rotating roller 4.
It is attached to 51. Further, the shutter 15 is provided so as to reciprocate over the rear end open position indicated by the solid line and the front end cut-off position indicated by the imaginary line, and when the normal pipe cutting operation is continued, that is, at the rear end position during product production, The cut product falls along the second locus FL2 and is thrown into a housing case (not shown) provided below, and a predetermined cut such as a cut end portion or a cut end portion of the pipe. Unnecessary parts with a length different from the length (approx.
(Corresponding to Pa, ΔPb) is pushed out from the guide tube 3,
Specifically, when the start end is cut by the pipe cutter 5 and separated as an unnecessary portion and when the end end is pushed out from the guide cylinder 3, the unnecessary portion is collided at the front end shielding position on the second locus FL2. , It is considered to drop it along the recovery FL3 to a position different from the accommodation case. That is, the shutter 15 is reciprocally moved to the aforementioned position by the cylinder 16.

The tailstocks 22A and 22B are attached to the upper surfaces of the left and right end portions of the frame 21, as shown in FIGS. 10 and 11, on the feed side of the conveyor with respect to the frame 21 to which the conveyor is attached. It can be moved horizontally by fitting the guide rollers 22c protruding on both sides to the guide rail 21B, and can be moved up and down on the base portion 22D on which the guide roller 22c is attached and above the base portion 22D. It has an elevating plate 22E arranged, and the elevating plate 22E is supported on the upper ends of a pair of legs 22F, 22F provided through the base portion 22D so as to move up and down, and at the rear of the legs 22F, 22F. , Lift plate 22E
A pair of poles 22G, 2 that are erected on the base portion 22D through the
Spring 22H interposed between the head of 2G and the lifting plate 22E
The tailing heads 22a and 22b are attached to the upper surface of the elevating plate 22E so as to be oriented in the feeding direction of the conveyor and rotatable in the circumferential direction.

In FIG. 1 and FIG. 2, 17 is a tailing head holding rail, which is horizontally held by holding stands 23A and 23B from the upstream end (left end in the drawing) to the downstream end (right end in the drawing) of the conveyor. The tailing head 22a, at the top dead center level where the end surface (left end surface in the drawing) of the long pipe P present can be pressed.
22b for holding the roller 22f, which is rotatably attached to the lower side of the legs 22F, 22F of the pair of tailstocks 22A, 22B as shown in FIGS. 10 and 11. A descending guide portion 17A, which is attached to the frame 21 so as to roll, and which descends at a relatively large inclination angle in the feeding direction, is formed at the downstream end portion thereof.

In FIG. 2, LS1 to LS4 denote limit switches, which are attached at predetermined positions on the upper surface of the frame 21 to which the conveyor is attached with a predetermined interval, and which are attached to the holding table 23A (shown in the figure). (Omitted) is engaged and disengaged.

Next, the operation of the above configuration will be described.

When the limit switch LS1 detects the holding table 23A due to the forward movement of the conveyor forming the feeding mechanism 2,
To the magnetic powder clutch constituting the power interrupting mechanism 13, a signal for sending a magnetic field is sent, the conveyor is stopped by turning off the power interrupting mechanism 13, and the operation of a pipe loading mechanism (not shown), Pipe stocker 21A
The long pipe P in the front row is dropped in the direction of the conveyor, and this pipe is horizontally and rotatably held by the pair of holding stands 23A and 23B.

Immediately after the above, the cylinder 11B forming the guide member 11 shown in FIG. 9 operates to lower the steady rest plate 11C, and the starting end portion of the long pipe P held by the holding stands 23A, 23B. , The guide pipe 3 is inserted into the guide tube 3 and brought into contact with the terminal end portion of the rotating feed pipe PA to prevent relative center runout between the pipes P and PA and to align them.

Immediately after the above, a magnetic field is formed in the magnetic powder clutch that constitutes the above-described disconnecting mechanism 13, and the conveyor starts operating. As a result, the long pipe P is held by the holding table 23.
While being held by A and 23B, they move forward a little together with the holding tables 3A and 3B, and stop when they come into contact with the advance pipe PA.

From the start of operation of the above conveyor, tailstock 22A
Moves forward with the tailing head 22a set at the top dead center level, contacts the end of the long pipe P, and pushes the long pipe P and the forward pipe PA forward as the conveyor advances.

When the feed pipe PA moves forward and the cut surface comes into contact with the contact member 9 as described above, this contact state is detected by, for example, a limit switch (not shown) mounted behind the contact member 9, The detection signal is output to the cylinder 61 that constitutes the pipe cutter feed mechanism 6. When the conveyor comes into a high load state due to the contact of the cutting surface with the contact member 9, the power continuation mechanism 13 is shut off to stop the conveyor. Therefore, the pipe 61 is lowered by the operation of the cylinder 61, and the feed is advanced. The pipe PA can be cut into a predetermined length dimension. Immediately after the product is cut, the holding rotary rollers 4A, 4 shown in FIG.
Due to the rotation of B and the pipe cutter 5, once the first trajectory FL1
A guide member that pops out immediately after being drawn
The second trajectory that collided with 14 and was unified by the reaction force at this time
It falls along FL2 and is stored.

When the limit switch LS2 detects the holding table 23A by continuing the above-described operation, the guide member 11 shown in FIG. 9 returns to operate and separates from the pipe. In this case, the starting end of the long pipe P is inserted into the guide tube 3.

Limit switch LS3
When the holding table 23A is detected, the cylinder 16 is actuated to move the shutter 15 to the front end shielding position shown by the phantom line, and the hit member reciprocating mechanism 10 is actuated to cause the hit member 9 to move.
To the retracted position.

Immediately after the above, the unnecessary portion at the end of the advance pipe PA is pushed out from the guide cylinder 3, and by the rotation of the holding and rotating rollers 4A, 4B and the pipe cutter 5 in FIG. After being blown to the 14 side and colliding with this, the reaction force at this time draws out the second locus FL2 and then kicks out, then collides with the shutter 15 and moves along the collection locus FL3 at a position different from that of the product described above. To fall.

When the limit switch LS4 detects the holding table 23A, a signal for taking the magnetic field is sent to the magnetic powder clutch that constitutes the power connection / disconnection mechanism 13, the conveyor is stopped, and the pipe cutter feed mechanism 6 is operated to operate the pipe. The cutter 5 is lowered to cut off the unnecessary portion of the starting end of the long pipe P. The cut unused portion at the start end falls along the same trajectory as the unused portion at the end described above and is accommodated.

When the pipe cutter feeding mechanism 6 is restored and the pipe cutter 5 is lifted after the cutting of the start end unnecessary portion is finished, the shutter 15 is returned to the rear end open position and the contact member reciprocating mechanism 10 is operated. After the return operation, the contact member 9
Return to the cutting length setting position.

After that, as the conveyor moves forward, the long pipe P
While being pressed and advanced by the tailing head 22a, it is sequentially cut into a predetermined length. This causes the tailstock 22A to move to the 11th
When the roller 22f attached to the lower ends of the legs 22F, 22F is released from the state where it is held by the tailstock head holding rail 17 by reaching the solid line position in the figure and further moving forward, the roller 22f springs. With the spring force of 22H, it rolls in pressure contact with the descending guide portion 17A of the rail 17, and the legs 22F, 22F
The pipe P is moved forward while lowering the tailstock head 22a together with the lifting plate, and its cut surface is abutted against the contact member 9 and, at the same time, the position indicated by an imaginary line, that is, the pipe P.
To the position where the pressure at the end of is released. Therefore, the pipe P reliably rotates while being held only by the holding and rotating roller 4. That is, the rotation state in which the settling of the pipe cutter 5 can be suppressed is ensured.

In FIG. 1, the holders 23A and 23B located on the return side of the conveyor move to the feed side and are detected by the limit switch LS1. From this point on, the above-mentioned items (1) to (5) are repeated to sequentially cut the long pipe P into a predetermined length.

[Advantages of the Invention] Since the present invention is configured as described above, it has the following effects.

The tailstock head holding rail allows the tailstock head of the tailstock to be held at a level at which it can concentrically abut the end surface of the pipe, and the long pipe can be pushed forward.

Further, since the tailing head can be rapidly lowered at the end portion of the conveyor by the lowering guide portion to release the pressing of the tail end of the pipe by the tailing head, the pipe can be reliably rotated during the cutting process, and This reduces the frequency of pipe cutter replacement,
It is possible to improve productivity and realize economic advantage.

[Brief description of drawings]

1 to 11 show an embodiment of the present invention, FIG. 1 is a schematic side view showing the overall configuration, FIG. 2 is a plan view of the same, and FIG. 3 is an enlarged front view showing a main part thereof. The figure is the same plan view, FIG. 5 is a schematic front view showing the relationship between the box-shaped frame and the box and the swing base, FIG. 6 is a side view in the vicinity of the contact member, FIG. 7 is the same plan view, and FIG. Explanatory view showing the swinging state of the contact member,
9 is an explanatory view showing the relationship between the guide member and the start and end of the pipe, FIG. 10 is a front view showing the relationship between the tailstock and the tailstock holding rail, and FIG. 11 is the operating state of the tailstock. FIG. 12 is a schematic side view showing a conventional example, FIG.
FIG. 13 is an explanatory view of the operating state of the concentric push head. 1 …… Automatic pipe cutting machine 2 …… Feeding mechanism 4 …… Holding rotating roller 5 …… Pipe cutter 6 …… Pipe cutter feeding mechanism 22A, 22B …… Tailstock 22a, 22b …… Tailoring head P …… pipe

Claims (1)

[Claims] 1. A feed mechanism for sequentially arranging long pipes in a straight line and intermittently moving in the axial direction, a holding rotary roller for holding and rotating a lead-out portion of the pipe led out by the feed mechanism, and a holding rotary roller. In a pipe cutter provided with a pipe cutter and a pipe cutter feed mechanism for cutting the pipe by reciprocating the pipe cutter when the pipe is stopped in the axial direction, the feed mechanism is At least one pair of tailstocks having a tailing head capable of moving up and down is attached to the conveyor, which is composed of an endless annular conveyor, and at a position where the end surface of the pipe can be pressed from the upstream end to the downstream end of the conveyor. A tailstock head holding rail for holding the tailstock head and a tailstock formed at the downstream end of the tailstock head holding rail Tailstock of descent device in the automatic cutting machine of the pipe, characterized in that the head is provided with a downward guide portion for lowering a position spaced from the end surface pressing position of the pipe.