JPH02250713A - Tailstock head in automatic cutting machine of pipe - Google Patents

Abstract

PURPOSE:To make a pipe not to be slipped and eccentric during the processing by assembling a holding pin engaged with the terminal part of a pipe movable over the downstream end side from the upper stream end side into a tailstock head. CONSTITUTION:A tail stock is advance in the state of a tailstock head 22a being set on an upper dead center level from the operation start of a conveyor, abutted onto the terminal of a long sized pipe P, the tip projecting part of a holding pin 18 is engaged with the terminal part of the pipe P, the long-sized pipe and a prefeeding pipe are pressed and advanced according to the advance of the conveyor in the holding state of preventing the slippage and eccentricity of the pipe P and cut in order in a specific length. The roller 19b of a bell crack 19B ascends an inclined cam face 19a with the tail stock reaching a continuous line position, namely the downstream turning over position of the conveyor and advancing further and when it is mounted on the apex face of a cam part 19A, the pin 18 is retreated into the head 22a, as shown by a virtual line, to release the holding state of the pipe P and to prepare for the turning over of the tail stock.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tailstock head in an automatic pipe cutting machine.

[Prior Art] For example, a pipe cutting device shown in FIG. 13 has been known as a pipe cutting device for cutting a long steel pipe into a predetermined size in the process of manufacturing nipples, which is one type of pipe duster. In Figure 0, A is an endless annular conveyor, B is a tailstock attached to conveyor A, the upper part of which is exposed on base C, and as conveyor A moves forward in the direction of arrow a, Move forward on the surface of base C. Then, when the end surface of the long pipe P held by the holding stand and a pair of holding rollers E and H and rotating in the circumferential direction comes into contact with the contact member F, the conveyor A is stopped, and the holding rollers E and H
The cutter G disposed on the upper side is rotated and lowered to cut the long pipe P to a predetermined length, and the cut pipe ΔP, that is, the product, is transferred to the holding roller E,
The rotation of C cutter G causes the long pipe P to fly out in the radial direction, and after the C cutter G is raised and retracted, the conveyor A is moved forward. From then on, while repeating the above operation, the long pipe P is successively cut into a predetermined position. It is configured to cut into length sentences and obtain the product.

[Problems to be Solved by the Invention] By the way, in the conventional pipe cutting device, the tailstock B
starts pushing the long pipe P from the starting end position P of the conveyor A.
When the conveyor A is moved to the end position P2 and the cutting of the long pipe P is completed, unless the conveyor A is reversed and the tailstock B is returned to the starting end position P, the next long pipe P will be cut. It is not possible to set it on the holding stand and holding roller E to prepare for cutting.

That is, every time the long pipe P is cut, the cutting operation must be interrupted, which results in wasted time, resulting in extremely poor productivity.

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 suppress the pipes P and move them forward. It is conceivable to improve productivity by eliminating the waste of having to interrupt the cutting operation every time the long pipe is cut.

However, even with this configuration, during the pushing process of the pipe P from the upstream end to the downstream end of the conveyor, the pipe P always properly corresponds to the tailstock B, and the tailstock B
Unless the end of the pipe P is configured to prevent it from coming off or being eccentric, cutting of the pipe P will be adversely affected and the quality of the product will be degraded.

The present invention has been developed in view of the above circumstances, and it reliably prevents the problems associated with pipes coming off or eccentricity during the conveyor pushing process, and at the downstream reversal position of the conveyor, the tailstock is moved along with the conveyor. The purpose of the present invention is to provide a tailstock head for an automatic pipe cutting machine that can be smoothly reversed to improve productivity, and can cut pipes appropriately to improve product quality.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention comprises a feeding mechanism as an endless annular conveyor, a tailstock is attached to this conveyor, and a tailstock is attached to the tailstock upstream of the conveyor. A tailstock head is attached to press the terminal end surface of the pipe from the end to the downstream end, and a holding pin that fits into the terminal end of the pipe from the upstream end to the downstream end is movably incorporated in the tailstock head. and includes a holding pin retraction mechanism for retracting the holding pin into the tailstock head immediately before the downstream reversal position of the conveyor.

[Function] According to the present invention, the holding pin incorporated in the tailstock head attached to the tailstock is fitted into the terminal end of the pipe from the upstream end to the downstream end of the conveyor. Since the pipe can be pushed forward, it is possible to reliably prevent the pipe from coming off the tailstock head or becoming eccentric.

In addition, the holding pin retraction mechanism allows the holding pin to retract into the tailstock head just before the downstream reversal position of the conveyor, and is disengaged from the pipe parking end. It can be easily reversed at the lower R reversal position.

[Example] Embodiments of the present invention will be described below based on the drawings.

Fig. 1 is a schematic side view showing the overall configuration of an automatic pipe cutting machine to which the present invention is applied, and Fig. 2 is a plan view thereof. In these figures, the automatic pipe cutting machine l cuts a long pipe P. Feeder a that sequentially arranges in a straight line and moves intermittently in the axial direction
2, a holding rotation roller 4 that holds and rotates the lead-out portion of the pipe P that is sent into the guide tube 3 by the feeding mechanism 2 and led out from the guide tube 3; and this holding rotation roller 4.
The pipe cutter 5 is provided with a pipe cutter 5 disposed oppositely on the upper side, and a pipe cutter feeding mechanism 6 that reciprocates the pipe cutter 5 to cut the pipe P when the pipe P stops moving in the axial direction.

The feed mechanism 2 consists of an endless ring-shaped chain conveyor attached to a frame 21, and a pair of tailstocks 22A and 22B are attached at equal intervals, and the feed mechanism 2 is horizontally moved along the frame 21 by the operation of the conveyor. Tailstock heads 22a and 22b attached to both tailstocks 22A and 22B, respectively, press the terminal end surface of the long pipe P.

Furthermore, a pair of holding stands 23A and 23B are installed between the tailstocks 22A and 22B at a predetermined interval, and a pipe stocker 2 is disposed adjacent to which side of the frame 21.
The long pipes P that are sequentially fed out one by one from 1A are held horizontally so as to be rotatable, so that the long pipes P are oriented at a predetermined height with their axis C1 directed in the feeding direction (arrow xi) of the feeding mechanism 2. That is, the tailstock heads 22a, 22b
is set concentrically with the axis of

The guide cylinder 3 is a cylinder with openings at both ends disposed on the downstream side of the feed mechanism 2 on the extension of the axis C1 of the long pipe P held horizontally by the holding stands 23A and 23B, and the upper end of the box-shaped frame 7 Extending part 71 extending from the rear side of the part
The axis C2 is set to be concentric with the axis C1 of the long pipe P which is held horizontally on the holding stands 23A and 23B.

The holding rotation roller 4 is attached to the extension portion 71 of the box-shaped frame 7.
It is installed in the guide tube 3 and placed directly downstream of the guide tube 3, and is used to hold a part of the circumference of the pipe led out from the guide tube 3 at, for example, three points to give circumferential rotation to the pipe. As shown in FIGS. 3 and 4, it is composed of a pair of left and right rollers 4A and 4B that rotate in the directions of arrows x2 and x2 by a rotational drive source (not shown).

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

The pipe cutter feeding mechanism 6 includes a cylinder 61 disposed inside a box-shaped frame 7, one end of which is connected to the tip of a piston rod 62 in the cylinder 61, as shown in FIG. It is comprised of a lever 63 that is pivotably supported on the lever 63 and a vertical connection member 64 that connects the other end of the lever 63 and the swing base 8.

In FIGS. 1 and 2, reference numeral 9 indicates a contact member, which has the function of a stopper against which the cut surface of the long pipe P comes into contact, and as shown in FIGS. 5 to 7, the box-shaped frame The swing member 92 is attached to the front side of the upper end of the other side of the swing member 7 by a pin 91 . Then, by the operation of the abutting member reciprocating mechanism 1O, which is constituted by a cylinder interposed between the front end surface of the box 51 and the swinging tip of the swinging member 92, the abutment member 9 is cut as shown by the solid line in FIG. It reciprocates between the length setting position and the retracted position shown by the imaginary line.

In FIGS. 1 and 2, 11 indicates a guide member;
A cylinder IIB is attached to the front end of the pipe stocker 21A by extending above the frame 21 via a bracket LLA, and a deflector 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 is composed of a stop plate 11c. That is, the ninth
As shown in the figure, the cuts have already been made sequentially to a predetermined length.
Terminal part ΔP of forward pipe FA being sent forward
Until the starting end Δpb of the pipe a and the blowing pipe FB are fed into the guide cylinder 3, the terminal end ΔPa and the starting end Δpb
With the steady rest plate 11c in contact with the upper surface of both pipes PA
, to prevent relative runout of the FB.

1 and 2, reference numeral 12 denotes 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 its output shaft 12a.
A power intermittent mechanism 13 is interposed between the input shaft 24 of the feed mechanism 2 and the input shaft 24 of the feed mechanism 2 .

The power intermittent mechanism 13 interrupts power transmission from the output shaft 12a to the input shaft 24 to stop the feed mechanism 2 when the feed mechanism 2 is under high load when the cut surface of the pipe is in contact with the contact member 9. In addition, when the load of the feed mechanism 2 is low, when the contact member 9 does not contact the end surface of the pipe, a mechanism that transmits power from the output shaft 12a to the input shaft 24 to operate the feed mechanism 2, such as a magnetic powder clutch, is used. has been done.

In FIG. 3 and FIG. 4, reference numeral 14 indicates an extrusion guide member, and 15 indicates a shutter. It is made of curved claw-shaped metal provided on the first trajectory FLI that is blown by the rotational force of the holding rotation roller 4, and its tip is cut with a pipe cutter 5.
The box 51 is located at the rear of the holding rotation roller 4 and is relatively close to the holding rotation roller 4. In addition, the shutter 15
is provided to move back and forth between the rear end open position shown by the solid line and the front end shielded position shown by the imaginary line, and is in the rear end open position when normal pipe cutting work continues, that is, when producing products. The product falls along the second trajectory FL2, is thrown into a storage case (not shown) provided below, and is cut at a length different from a predetermined cutting length, such as at the beginning or end of the pipe. When the unnecessary length portion (approximately corresponding to ΔPa and ΔPb mentioned above) is pushed out from the guide tube 3, specifically when the starting end is cut by the pipe cutter 5 and separated as an unnecessary portion, and when the terminal end is pushed out from the guide tube 3 When pushed out from the cylinder 3, the second trajectory F
Located at the front end shielding position on the LZ, colliding the unnecessary part,
It is designed so that it is dropped along recovery FL3 at a position different from that of the storage case. That is, the shutter 15 is moved back and forth to the above-mentioned position by the cylinder 16.

The tailstocks 22A and 22B are attached to the top surface of both left and right ends of the frame 21 on which the conveyor is attached, as shown in FIGS. 10 to 12, on the feed side of the conveyor. By fitting guide rollers 22c protruding on both sides of the guide rail 21B, horizontal movement is possible.
It has an elevating plate 22E arranged to be movable up and down on the upper side of D,
The elevating plate 22E is supported by the upper ends of a pair of legs 22F, 22F that are provided by penetrating the base portion 22D so as to be able to rise and fall freely.
A pair of poles 22G, erected on the base portion 22D through E, are constantly urged downward by a spring 22H interposed between the head of the pair of poles 22G and the elevating plate 22E, and the upper surface of the elevating plate 22H Tailstock heads 22a and 22b are oriented in the feeding direction of the conveyor and are rotatably mounted in the circumferential direction.

A holding pin 18 is incorporated into each tailstock head 22a, 22b on its respective axis so that it can move forward and backward. That is, the holding pin 18 is the tailstock head 22a.

22b so as to be movable forward and backward, and under normal conditions, the leading end slightly protrudes from the tailstock head 22a, 22b due to the spring force of an internal spring 18a, and the engaging member 18A is fixed to the rear end. There is.

The holding pin retraction mechanism 19 is for retracting the holding pin 18 into the tail stock lads 22a, 22b immediately before the downstream reversal position of the conveyor, and is for retracting the holding pin 18 into the tailstock rads 22a, 22b immediately before the downstream reversal position of the conveyor on the upper surface of one guide rail 21B. An inclined cam surface 19a that is formed in correspondence with and gradually increases in height toward the downstream side.
a bell crank 19B having a proximal end pivoted to one side of the base portion 22D of each of the tailstocks 22A and 22B, and a bell crank 19B having a roller 19b that moves on the upper surface of the guide rail 21B at one end; , is attached to the upper surface of one side of the elevating plate 22E so as to be rotatable in the horizontal direction by a pin 19C, one end engages with the other end of the bell crank 19B, and a vertical bar 19d erected on the other end engages. The lever 190 engages with the member 18A.

1 and 2, reference numeral 17 denotes a tailstock head holding rail, which extends from the upstream end (left end in the drawing) to the downstream end (right end in the drawing) of the conveyor, holding bases 23A, 2
The tailstock head 2, 2a is at the top dead center level where it can press the terminal end face (left end face in the drawing) of the long pipe P held horizontally by the pipe 3B.

This is for holding the 22b.
As shown in the figure, the roller 22f, which is rotatably attached to the lower side of the legs 22F and 22F of the pair of tailstocks 22A and 22B, is attached to the frame 21 so that the roller 22f can be moved, and the downstream A descending guide portion 17A that descends at a relatively large inclination angle toward the feeding direction is formed at the end.

In FIG. 2, LSI to LS4 indicate limit switches, which are mounted at predetermined positions and at a predetermined interval on the upper surface of the frame 21 on which the conveyor is attached.
The contact member (not shown) attached to 3A engages and disengages to operate.

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

- When the limit switch LSI detects the holding table 23A due to the forward movement of the conveyor that makes up the feeding mechanism 2, a signal is sent to the magnetic powder clutch that makes up the two-power disconnection mechanism 13 to remove the magnetic field. The power intermittent mechanism 13 is cut off to stop the conveyor, and a pipe loading mechanism (not shown) is operated to drop the long pipe P in the front row of the pipe stocker 21A toward the conveyor, and this pipe is then separated into a pair of pipes. It is held horizontally and rotatably by holding stands 23A and 23B.

■ Immediately after the above ■, the cylinder IIB constituting the guide member 11 shown in FIG. and the terminal end of the advance pipe PA which has already been inserted into the guide tube 3 and is rotating, thereby preventing relative runout between the two pipes P and FA and aligning them in a straight line.

(2) Immediately after the above (2), a magnetic field is formed in the magnetic powder clutch that constitutes the disconnection mechanism 13 mentioned in (2) above, and the conveyor starts operating. As a result, the long pipe P is held on the holding base 2.
While being held by 3A and 23B, it moves a little forward together with the holding tables 3A and 3B, and stops when it comes into contact with the advance pipe FA.

■From the start of operation of the conveyor in the above (■), the tailstock 22A moves forward with the tailstock head 22a set at the top dead center level, comes into contact with the end of the long pipe P, and as shown in FIG. , the protruding tip of the holding pin 18 fits into the terminal end of the pipe P, suppressing the long pipe P and the forward-feeding pipe FA as the conveyor moves forward in a holding state that prevents the pipe from coming off and eccentricity. advance.

■ When the advance pipe FA moves forward due to the above ■ and the cut surface contacts the contact member 9, this contact state is detected by, for example, a limit switch (not shown) installed at the rear of the contact member 9. , this detection signal is output to the cylinder 61 constituting the pipe cutter feeding mechanism 6.

When the cut surface comes into contact with the abutting member 9 and the conveyor becomes under a high load, the power cut-off mechanism 13 is cut off and the conveyor is stopped. Therefore, the pipe cutter 5 is lowered by the operation of the cylinder 61 and the pipe cutter 5 is moved forward. Pipe FA can be cut to a predetermined length. Immediately after the product is cut, the product is blown away by the rotation of the holding rotary rollers 4A, 4B and the pipe cutter 5 shown in FIG. It collides with the guide member 14, falls along the unified second locus FL2 due to the reaction force at this time, and is housed.

(2) When the limit switch LS2 detects the holding base 23A due to the continuation of the operation in (2) above, the guide member 11 shown in FIG. 9 operates to return and separates from the pipe. In this case, the long pipe P
The starting end of is inserted into the guide tube 3.

■ By continuing the operation of the above ■, limit switch LS3
When detects the holding table 23A, the cylinder 16 is actuated to move the shutter 15 to the front end shielding position shown by the imaginary line, and the abutting member reciprocating mechanism 10 is actuated to lower the abutting member 9 to the retracted position.

■ Immediately after the above-mentioned ■, the unnecessary end portion of the advance pipe PA is pushed out from the guide cylinder 3, and the holding rotation roller 4A of FIG.
Due to the rotation of the pipe cutter 4B and the pipe cutter 5, the pipe was kicked out on a first trajectory FLI and was thrown toward the kicking guide member 14 and collided with it, and due to the reaction force at this time, it was kicked out on a second trajectory FL2. Thereafter, the product collides with the shutter 15 and falls along the recovery path FL3 to a position different from the product described in (2) above.

■When the limit switch LS4 detects the holding table 23A, a signal to remove the magnetic field is sent to the magnetic powder clutch that constitutes the power intermittent mechanism 13, stopping the conveyor and causing the pipe cutter feeding mechanism 6 to operate. The pipe cutter 5 is lowered to cut the unnecessary portion of the starting end of the long pipe P. The cut unnecessary portion at the start end falls along the same trajectory as the unnecessary portion at the end described in (2) above and is stored.

[Stocks] After cutting the unnecessary part of the starting end mentioned in ■ above,
The pipe cutter feed mechanism 6 operates to return, and the pipe cutter 5
When the shutter 15 rises, the shutter 15 returns to the rear end open position,
In addition, the abutment member reciprocating mechanism 10 is operated to return the abutment member 9 to the cutting length setting position.

■Thereafter, as the conveyor moves forward, the long pipe P is pressed forward by the tailstock head 22a and cut into predetermined lengths one after another. When the roller 19b of the bell crank 19B moves up the inclined cam part 19a and rides on the top surface of the cam part 19A, as the conveyor reaches the downstream reversing position, the roller 19b of the bell crank 19B moves up the inclined cam part 19a and rides on the top surface of the cam part 19A, as shown by the imaginary line. , the holding pin 18 retracts into the tailstock head and the pipe P
Release the holding state of the tailstock 22A.

Prepare for the reversal of 22B.

O In FIG. 1, the holding tables 23A and 23B located on the return side of the conveyor move to the feed side and are detected by the limit switch LSI. From this point on, steps 1 to 0 are repeated to sequentially cut the long pipe P into a predetermined length.

[Effect of the Invention 1 The present invention is configured as described above, and therefore produces the following effects.

A holding pin built into the tailstock head attached to the tailstock can push the pipe from the upstream end to the downstream end of the conveyor while being fitted to the end of the pipe, It is possible to reliably prevent the pipe from coming off the tailstock head or becoming eccentric. Therefore, during the process of pushing the pipe from the upstream end to the downstream end of the conveyor, it is possible to ensure that the pipe is in a state where it can be cut appropriately so as to properly correspond to the tailstock head, and the quality of the product can be improved.

Further, the holding pin retraction mechanism causes the holding pin to retract into the tailstock head just before the downstream reversal position of the conveyor, and the fitting with the pipe terminal end is released.

The tailstock and tailstock head can be easily reversed in a downstream reversal position of the conveyor.

That is, it becomes possible to configure the feeding mechanism with an endless annular conveyor, and it is possible to realize a significant improvement in productivity.

[Brief explanation of drawings]

1 to 12 show embodiments of the present invention, in which FIG. 1 is a schematic side view showing the overall configuration, FIG. 2 is a plan view of the same, and FIG.
The figure is an enlarged front view showing the main parts, FIG. 4 is a plan view of the same, FIG. 5 is a schematic front view showing the relationship between the box-shaped frame, the box, and the swing base, and FIG. 6 is a side view near the contact member. Fig. 7 is a plan view of the same, Fig. 8 is an explanatory drawing showing the swinging state of the contact member, Fig. 9 is an explanatory drawing showing the relationship between the guide member and the starting and ending ends of the pipe, and Fig. 10 is the tailstock head. FIG. 11 is an explanatory side view showing the operating state of the holding pin, FIG. 12 is a plan view of the same part, and FIG.
The figure is a schematic side view of a conventional example. l... Automatic pipe cutting machine 2... Feeding mechanism 4... Holding rotation roller 5... Pipe cutter... Pipe cutter feeding mechanism 8... Holding pin 9... Holding pin retraction mechanism 2A 2B...Tailstock b...To tailstock P...Pipe

Claims (1)

[Claims] (1) A feeding mechanism that sequentially arranges long pipes in a straight line and moves them intermittently in the axial direction, a holding rotation roller that holds and rotates the portion of the pipe that is led out by this feeding mechanism, and a holding rotation roller that opposes this holding rotation roller. In the automatic pipe cutting machine, the pipe cutter is provided with a pipe cutter and a pipe cutter feeding mechanism that cuts the pipe by reciprocating the pipe cutter when the axial movement of the pipe is stopped, wherein the feeding mechanism has an endless annular shape. A tailstock is attached to this conveyor, and a tailstock head that presses the end surface of the pipe from the upstream end to the downstream end of the conveyor is attached to the tailstock. A holding pin that fits into the terminal end of the pipe from the upstream end to the downstream end is built in so that it can move back and forth, and a holding pin retraction mechanism that allows the holding pin to retract into the tailstock head immediately before the downstream reversal position of the conveyor. A tailstock head for an automatic pipe cutting machine, characterized by being equipped with an insertion mechanism.