JPH02237716A - Automatic cutting device for pipe - Google Patents

Abstract

PURPOSE:To sharply improve productivity and obtain a high quality product by providing a endless ring-state conveyer, tail stock and support stand, tail head retaining mechanism, pipe cutter, cutting length adjustment mechanism, abutting member reciprocating movement mechanism, guide member, and power supply and power interrupting mechanism. CONSTITUTION:A endless ring-state conveyer 1,tail stocks 2A and 2B having an elevatable tail head, support stands 3A and 3B rotatably supporting a pipe P, tail head retaining mechanism 4, guide tube 5 passing the pipe P from the conveyer 1, support rotary roller 6 having rotation to the pipe P, and pipe cutter 7 are provided. And an abutting member 9 is foreward and afterward moved in the axis direction of the pipe P with a cutting length adjustment mechanism 100, the abutting member 9 is reciprocatively moved to a cutting length setting position and a refuge position with an abutting member reciprocative movement mechanism 110, and the relative run-out of both pipes P is prevented abutting an advance and next sending pipes P with a guide member 120. And moreover a tail head descent mechanism 130, the drive source 140 of the conveyer 1, and a power interrupting mechanism are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic pipe cutting device. [Prior Art] For example, a pipe cutting device shown in FIG. 15 has been known as a pipe cutting device for cutting a long steel pipe into a predetermined size in the process of manufacturing a nipple, which is one type of pipe joint. It is being done. In the figure, A is an endless annular conveyor, B is a tailstock attached to the conveyor A, and the upper part is the base C.
It is exposed above and moves forward on the surface of base C as conveyor A moves forward in the direction of arrow a. and holding stand D
When the end surface of the long pipe P, which is held by a pair of holding rollers E and H and rotates in the circumferential direction, comes into contact with the contact member F, the conveyor A is stopped, and the holding rollers E,
Lower the cutter G, which is placed opposite to the upper side of the cutter H, while rotating it. The long pipe P is cut to a predetermined length dimension, the cut pipe ΔP is projected radially outward by the rotation of the holding rollers E, E and the cutter G, and then the cutter G is raised and retreated, and then transferred to the conveyor. Move A forward,
Thereafter, the above-mentioned operation is repeated to sequentially cut the long pipe P into a predetermined length to obtain a product. [Problem to be solved by the invention] However, 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 table D and the holding roller E to prepare for cutting. That is,
Each time the long pipe P is cut, the cutting operation must be temporarily stopped, which results in wasted time, which has the disadvantage of extremely low productivity. The present invention was developed in view of the above circumstances, and it eliminates the waste of temporarily stopping the cutting work, enables continuous cutting, significantly improves productivity, and eliminates variations in cutting dimensions. The purpose of this invention is to provide an automatic pipe cutting device that can produce high-quality products that do not cause any damage. [Means for Solving the Problems] In order to achieve the above object, the present invention includes an endless annular conveyor, and at least one pair of tailstocks that are attached to the conveyor at equal intervals and have tailstock heads that can be raised and lowered. and a plurality of tailstocks that are located between these tailstocks and are attached to the conveyor at a predetermined interval, and that hold the pipe horizontally and circumferentially rotatably with the axis of the pipe oriented in the feeding direction of the conveyor. a holding stand, and a tailstock head holding mechanism that holds the tailstock head at a top dead center level capable of pressing the terminal end surface of the pipe held by the holding stand from the upstream end to the downstream end of the conveyor; a guide cylinder disposed downstream of the conveyor on the axial extension of the pipe horizontally held on the holding table, through which the pipe pressed by the tailstock head and pushed out from the conveyor passes; and a guide cylinder disposed downstream of the guide cylinder. a holding rotary roller that holds a part of the circumference of the pipe pushed out from the guide tube at at least two points to rotate the pipe in the circumferential direction; a pipe cutter provided opposite to the holding rotary roller; a pipe cutter feeding mechanism that reciprocates the force vine from a cutting position to a non-cutting position; a contact member disposed on the downstream side of the pipe force cover and against which the cut surface of the pipe comes into contact; A cutting length adjustment mechanism that moves the hit material forward and backward in the axial direction of the pipe, a cutting length setting position that brings the dust member into contact with the cut surface of the pipe, and a cutting section at the beginning and end of the pipe. an abutment member reciprocating mechanism that reciprocates the abutment member from the cutting length setting position to a retracted position away from the cutting length setting position when the cut portion is pushed out from the guide tube; and a mechanism capable of moving toward and away from the pipe between the conveyor and the guide tube. a guide member that is arranged and contacts both pipes to prevent relative runout between the two pipes until the terminal end of the forward pipe and the start end of the subsequent pipe are respectively fed into the guide cylinder; and the tailstock head. a tailstock head lowering mechanism that is provided at the downstream end of the holding mechanism and lowers the tailstock head to a bottom dead center level away from the terminal end pressing position of the pipe; and a drive source that rotationally drives the conveyor. is interposed between the output shaft of this drive source and the input shaft of the conveyor, and cuts off power transmission to the input shaft during high load when the cut surface of the pipe is in contact with the abutment member, and Power disconnection aIj that enables power transmission to the input shaft at low loads when the member does not contact the end face of the pipe! It is equipped with a structure. [Function] According to the present invention, a plurality of holding stands attached to the conveyor at predetermined intervals can sequentially hold the long pipe rotatably horizontally and in the circumferential direction. Held by a holding stand
The long pipe is pushed forward in sequence by the tailstock head of the tailstock, and after being centered by passing through the guide tube, it is given rotation in the circumferential direction by the holding rotation roller. The cutting length of the pipe pushed forward by the tailstock head is set by the cutting surface of the pipe coming into contact with the abutment member, and the pipe is cut to a predetermined length by rotation of the pipe cutter and operation of the pipe cutter feeding mechanism.

The tailstock head holding mechanism holds the tailstock head of the tailstock at the top dead center level where it can make concentric contact with the end surface of the pipe held horizontally on the holding base, and holds the long pipe. It can be pushed forward under proper conditions. The cutting length adjustment mechanism allows the cutting length of the pipe to be adjusted arbitrarily by moving the contact member forward and backward. a position where the abutting member comes into contact with the cut surface of the pipe to set the cutting length of the pipe by the abutting member reciprocating mechanism;
This prevents contact with the unnecessary part when the length of the unused part, such as the beginning or end end of a pipe, is pushed out of the guide tube and is different from the predetermined cutting length. It can be moved back and forth to the evacuation position. The guide member is brought into contact with both pipes until the terminal end of the forward pipe, which is no longer held by the holding stand, and the starting end of the next pipe, which is continuous with this terminal end, are respectively fed into the guide cylinder. to prevent relative runout between both pipes,
Stabilize the continuous movement of the pipe. The tailstock head lowering mechanism suddenly lowers the tailstock head from the top dead center level to the bottom dead center level at the end of the conveyor to release the tailstock head from pressing on the end of the pipe. While gradually eccentric at the reversed position of the end, the end of the pipe is no longer pressed, avoiding uncertain rotation of the pipe and ensuring proper cutting conditions. The drive source is connected by a power intermittent mechanism interposed between the output shaft of the drive source and the input shaft of the conveyor! It is possible to stop the conveyor under high load when the cut surface of the pipe is in contact with the contact member during operation, and to operate the conveyor under low load when the cut surface or the starting end of the pipe does not contact the contact member. In other words, since the drive source can be kept running at all times, the speed at which the conveyor changes from a stopped state to an operating state becomes faster. [Example] Hereinafter, an example of the present invention will be described based on the drawings. FIG. 1 is a schematic side view showing the overall configuration of the present invention, and FIG. 2 is a plan view thereof. In these figures, 1 is an endless annular conveyor, 2A, 2B are a pair of tailstocks, 3A, 3B
is a holding base, 4 is a tailstock head holding mechanism, 5 is a guide cylinder, 6
1 is a holding rotation roller, 7 is a pipe force vine, 8 is a pipe force vine feeding mechanism, 9 is a contact member, 100 is a cutting length adjustment mechanism, 110 is a contact member reciprocating mechanism, 120 is a guide member,
130 is a tailstock head lowering mechanism, 140 is a driving source, 15
0 indicates a power intermittent mechanism. The endless annular conveyor 1 is a chain conveyor,
A pair of tailstocks 2A and 2B are placed at equal intervals on this conveyor l.
is installed. The tailstocks 2A and 2B are attached to the upper surface of both left and right ends of the frame 10 on the feed side of the conveyor 1, as shown in FIGS. By fitting guide rollers 21 on both sides of the guide rail 11, horizontal movement is possible.
It has a base part 22 with a base part 22 attached thereto, and an elevating plate 23 disposed above the base part 22 so as to be movable up and down.
．． A pair of balls 25 and 25 are supported by the upper end of Pn 24 and are erected on the base part 22 through the elevating plate 23 at the rear of Pn24, 24. A tailstock head 27 is attached to the upper surface of the elevating plate 23 so as to be oriented in the feeding direction of the conveyor l and rotatable in the circumferential direction. The holding stands 3A and 3B in Fig. 1 and Fig. 2 are the tailstock 2A.
, 2B, with a predetermined interval between the conveyors 1 and 2B.
The long pipes P are attached to the frame 10 and are sequentially delivered one by one from the pipe stocker l2 arranged adjacent to the side of the frame 10 by the operation of a pipe carrying mechanism to be described later.
The long pipe P held by these holding stands 3A and 3B has its axis CI oriented in the feeding direction (arrow xi) of the conveyor 1, and is held at a predetermined height. is set to . That is, as shown in FIG. 5, the holding tables 3A and 3B have an upright plate 31 and holding rollers 32 and 32 rotatably attached to both left and right sides of the upright plate 31, and have a fall prevention mechanism on one side. It has a structure in which a protruding piece 33 is provided to protrude upward. The tailstock head holding mechanism 4 in FIGS. 1 and 2 has a length that is horizontally held by holding tables 3A and 3B from the upstream end (left end in the drawing) to the downstream end (right end in the drawing) of the conveyor 1. This is to hold the tailstock head 27 at the top dead center level where it can press the terminal end surface (left end surface in the drawing) of the length pipe P, and as shown in FIG. 3, the pair of tailstock heads 2A and 2B frame 1 opposite the underside of the legs 24.24
Left and right 1 extending in the long sleeve direction of the conveyor l attached to 0
A pair of rails 41.41 and a roller 24a attached to the lower end of said leg 24.24 are connected to the rail 41.41. 41 is made up of the aforementioned spring 26. The guide tube 5 shown in FIGS. 1 and 2 is arranged on the downstream side of the conveyor I on the extension of the axis C1 of the long pipe P held horizontally by the holding tables 3A and 3B, and is open at both ends. It consists of a cylindrical body. That is, the guide tube 5 is inserted from the rear side of the upper end of the box-shaped frame 160, which is disposed at a position offset to one side (position offset in the direction of the paper in FIG. 1) at the front side of the downstream end of the conveyor 1 (right side in the drawing). , the axis of the long pipe P which is fixed on the extension part 181 extending towards the other side (the opposite side of the paper in FIG. 1) and whose axis C2 is held horizontally by the holding stands 3A, 3B 11 It is set concentrically with C 1 . The holding rotation roller 6 is attached to the extending portion 1 of the box-shaped frame 160.
61 and placed immediately downstream of the guide tube 5, it holds a part of the circumference of the pipe pushed out from the guide tube 5 at three points, for example, and gives circumferential rotation to the pipe. , as shown in FIGS. 6 and 7, the rotational drive source (
It is composed of a pair of left and right rollers 6A and 6B that rotate in the directions of arrows C (x2 and x2), and a kick-out guide member 61 is disposed above one side. The pipe cutter 7 shown in FIGS. 1 and 2 consists of a disk force lid, and is provided above and facing the holding rotary roller 6. That is, the pipe cutter 7 is removably fixed to an output shaft 7z protruding from a box 71, and an input shaft 73 of the box 7l is connected to a drive motor 75 via a coupling 74 and is rotationally driven by the drive motor 75. It looks like this. The drive motor 75 is mounted on two sides of a swing base 170 that is swingably mounted on the box-shaped frame 160 via bearings 1132 and 182, and the 7l is installed. The pipe power ivy feeding mechanism 8 includes a cylinder 81 disposed inside a box-shaped frame 160, and as shown in FIG.
A lever 83 whose one end is connected to the tip of the piston rod 8z in the cylinder 81 and is pivotally supported so as to be swingable about a shaft 83A, and a vertical lever which connects the other end of the lever 83 and the W movement base 170. The contact member 9 in FIGS. 1 and 2, which is composed of a connecting member 84, is
It has the function of a stopper with which the cross section comes into contact,
As shown in FIGS. 8 to 10, the box-shaped frame 16
A cutting length adjustment mechanism 1 is attached to a swinging member 92 that is hingedly connected by a pin 91 to the front side of the upper end on the other side of 0.
It is attached along with 00. That is, the cutting length adjustment mechanism 100 is rotatably but immovably incorporated into the swinging member 92, and includes a threaded rod 101 that extends forward and backward through the central part of the swinging member 92 in the width direction. Threaded rod 101
The adjustment handle 102 is formed with a female thread (not shown) that is externally fitted and screwed into the feed screw 101, and the left and right handles 102 are slidably attached to each other by penetrating the swinging member 92 back and forth on both sides of the feed screw 101.
Pair of guide rods 103, 103 and these guide rods 10
3, while connecting the rear end of 103 with a bridge, screw rod 1
01 and a connecting plate 104 to which the rear end of the connecting plate 104 is connected and fixed, and the abutment member 9 is held on the upper side of the widthwise center of the connecting plate 104 via a holding member 93 so as to freely protrude rearward. There is. Therefore, by rotating the adjustment handle 102 in the forward and reverse directions, the threaded rod 101 moves forward and backward, and the abutting member 9 moves forward and backward, so that the distance from the position of the cutting path of the pipe by the pipe forceter 7 to the abutting member 9 is moved forward and backward. The length, that is, the cutting length of the pipe, can be adjusted as desired. The contact member reciprocating mechanism 110 in FIGS. 1 and 2 is as follows:
The cutting length setting position where the abutment member 9 is brought into contact with the cut surface of the long pipe P, and when the unnecessary parts such as the beginning end cutout portion and the end end cutout portion of the pipe, which will be described later, are pushed out from the guide tube 5. , is for reciprocating the abutment member 9 to a retracted position away from the cutting length setting position, and as shown in FIG. 8 and FIG. The actuation of this cylinder causes the abutment member 9 to reciprocate between the cutting length setting position shown by the solid line in FIG. 11 and the retracted position shown by the imaginary line. ．． The guide member 120 in FIG. 1 and FIG.
A cylinder 122 is attached to the front end of the forceps 12 and extends to the upper side of the frame 10 via a bracket 121, and by the operation of this cylinder 122, the cylinder 122 moves downward and comes into contact with the pipe when descending. It consists of a steady rest plate 123 that prevents vibration. That is, as shown in FIG. 12, the terminal end ΔPa of the forward pipe FA and the starting end ΔPb of the next pipe PB, which have been sequentially cut into predetermined lengths and fed forward, are respectively guided into the guide tube. The steady rest plate 123 is brought into contact with the top surface of the terminal end ΔPa and the starting end ΔPb until both pipes FA and PB are fed into the pipes 5.
Prevents relative center runout. The tailstock head lowering mechanism 130 in Figure wSl and Figure 2 descends relatively steeply toward the front formed at the downstream ends of the pair of left and right rails 41, 41 that constitute the tailstock head holding mechanism 4. It is composed of a lowering part 41A and a spring 26 shown in FIGS. 3 and 4. Therefore, the tailstock head 27 has a roller 24a attached to the lower end of the leg 24.24 in the tailstock 2A, 2B.
is held by the tailstock head holding mechanism 4,
That is, the spring force of the spring 26 causes the roller 24a to move toward the rail 41. 41, it is located at the top dead center level and concentrically presses the end surface of the long pipe P, and when it is lowered by the tailstock head lowering mechanism 130, that is, the roller 24a is the descending part 4LA
, and while the roller 24a is pressed against the descending portion 41A by the spring force of the spring 26, the leg 24.
24 and the elevating plate 23 to suddenly descend to the bottom dead center level, the pressure on the end surface of the pipe by the tailstock head 27 is released, so the tailstock head 27 moves to the inverted position at the end of the conveyor 1. The pipe forceter 7 can easily and reliably rotate the pipe, avoiding the unreliable rotation of the pipe caused by pressing the end surface of the pipe while gradually eccentrically rotating the pipe. It is possible to cut the pipe vines 7, prevent the cutting edge of the pipe vines 7 from becoming flattened in a short period of time, and extend the life of the pipe vines 7. In FIGS. 1 and 2, the drive source 140 consists of a motor mounted on a base 141 attached to the front end of the pipe stocker 12, and between its output shaft 142 and the input shaft 13 of the conveyor l. A power intermittent mechanism 150 is provided. The power disconnection mechanism 150 stops the conveyor 1 by interrupting power transmission from the output shaft 142 to the input shaft 13 when the conveyor 1 is under high load when the cut surface of the pipe is in contact with the contact member 9, and when the cut surface of the pipe is in contact with the contact member 9. When the load on the conveyor 1 is low, when the member 9 does not come into contact with the end surface of the pipe, the output shaft 142
A mechanism for operating the conveyor 1 by transmitting power from the input shaft 13 to the input shaft 13, such as a magnetic powder clutch. In FIGS. 2 and 6, 180 indicates a shutter, which is provided so as to be reciprocated by a cylinder 181 between a rear end open position shown by a solid line and a front end shielded position shown by a phantom line. When the work continues, the rear end is in the open position, and the cut product falls along the trajectory y1, is thrown into a storage case (not shown) provided below, and is placed at the beginning or end of the pipe. When an unnecessary part (approximately corresponding to ΔPa, Δpb mentioned above) having a length different from the predetermined cutting length, such as a cutting edge part, is pushed out from the guide tube 5, the starting end is cut by the pipe forceter 7. When it is separated as an unnecessary part and when the terminal end is pushed out from the guide tube 5, it is in the front end shielding position and collides with the unnecessary part so that it falls to a position different from the storage case along the trajectory y2. This is taken into consideration. Also, Figures 1 and 2. and in FIG. 13, 19
0 indicates a pipe loading mechanism, in which a stopper 12A attached to the loading end of the pipe stocker 12 pushes up the positioned long pipe P in the front row from below,
This is for overcoming the stopper 12A and dropping it to the conveyor I side, and is composed of a cylinder 191 and a push-up member 182 fixed to the upper end of the piston rod of this cylinder 191. Further, in FIG. 2, LSI to LS4 indicate limit switches, which are mounted at a predetermined interval at a predetermined position on the upper surface of the frame 10 on which the conveyor l is attached, and which are mounted on the holding table 3A. (not shown)
It is designed to operate by engaging and disengaging. Next, the operation of the above configuration will be explained. - When the limit switch LSI detects the holding table 3A due to the forward movement of the conveyor l, a signal to remove the magnetic field is sent to the magnetic powder clutch that constitutes the power intermittent mechanism 150.
The power intermittent mechanism 150 is cut off to stop the conveyor l, and the cylinder 191 of the pipe carry-in mechanism 190 shown in FIG. As shown in Figure 14A, it is held horizontally and rotatably by a pair of holding stands 3A and 3B.

■ Immediately after the above ■, the cylinder 122 constituting the guide member 120 shown in FIG.
3 is lowered and brought into contact with the starting end of the long pipe P held by the holding tables 3A and 3B and the terminal end of the forwarding pipe PA which has already been inserted into the guide tube 5 and is rotating, Arrange both pipes P and FA in a straight line to prevent relative runout. ■ Immediately after the above ■, the intermittent mechanism 150 described in the above ■
A magnetic field is formed in the magnetic powder clutch that constitutes the conveyor 1, and the conveyor 1 starts operating. As a result, the long pipe P
is held on the holding bases 3A and 3B.
, 3B, and stops when it comes into contact with the advance pipe PA. ■From the start of continuous rotation of the conveyor in the above (■), the tailstock 2A moves forward with the tailstock head l7 set at the top dead center level, and the tailstock 2A moves forward with the tailstock head l7 set at the top dead center level. As shown in Figure B, the end of the long pipe P is brought into contact] 2. As the conveyor 1 moves forward, the long pipe P and the advancing pipe PA are pushed forward.

■ When the advance pipe PA moves forward due to the above ■ and the cut surface comes into contact with the abutment member 9 as shown in FIG. It is detected by a switch (Il8, not shown), and this detection signal is outputted to the cylinder 81 constituting the pipe force vine feeding mechanism 8. The cut surface touches the member 9
When the conveyor 1 becomes under a high load due to contact with the cylinder 81, the power intermittent mechanism 150 is cut off and the conveyor 1 is stopped. Can be cut to length. The product thus cut is transferred to the holding rotating rollers 6A and 6B shown in FIG. 6 immediately after the product is cut.
Due to the rotation of the pipe forceter 7, it is once thrown toward the kick-out guide member 61 and collides with it, and due to the reaction force at this time, it falls along the trajectory y1 and is stored. (ΦBy continuing the operation of the above ■, limit switch LS2
When detects the holding table 3A, the guide member 120 in FIG.
moves back and leaves the pipe, as shown in FIG. 140. In this case, the starting end of the long pipe P is inserted into the guide tube 5.

■ By continuing the operation of the above ■, limit switch LS3
When detects the holding base 3A, the cylinder 181 shown in FIG. lower to the retracted position (14th
(See figure E). ■Immediately after the step (■) above, the unnecessary end portion of the advance pipe PA is pushed out from the guide tube 5, and by the rotation of the holding rotary rollers 6A, 6B and the pipe forceter 7 in FIG.
- The product is blown toward the kick-off guide member 61 and collides with it, and the reaction force at this time causes the product to collide with the shutter 180, and then falls along the trajectory y2 to a position different from the product described in section (2) above.

■When limit switch LS4 detects holding table 3A,
A signal to remove the magnetic field is sent to the magnetic powder clutch constituting the power intermittent mechanism 150, and the conveyor 1 is stopped, and the pipe force cutter 7 is lowered and lengthened by the operation of the pipe force feeder mechanism 8. Cut off the unnecessary part of the starting end of the length pipe P. The cut unnecessary part at the start end falls along the trajectory y2 and is stored in the same way as the unnecessary part at the end described in (2) above. [Stocks] After cutting the unnecessary part of the starting end mentioned in ■ above,
The pipe cutter feeding mechanism 8 returns to operation, and the pipe cutter 7
When the shutter 180 is raised, the shutter 180 returns to the rear end open position shown in FIG. 14F, and the abutting member reciprocating mechanism 110 is operated to return the abutting member 9 to the cutting length setting position. ■After that, as the conveyor l moves forward, the long pipe P
While being pushed forward by the tailstock head 27, the pieces are sequentially cut into predetermined lengths. As a result, the holding tables 3A and 3B located on the return side of the conveyor I in FIG. 1 move to the feed side and are detected by the limit switch LSI, and from this point on, the above steps , the hair length pipe P is sequentially cut into predetermined lengths.

[Effects of the Invention] Since the present invention is configured as described above, it produces the effects described below. The long pipes are sequentially held horizontally by the holding stand attached to the endless annular conveyor, and the held long pipes can be sequentially advanced by the tailstock.
Continuous pipe cutting becomes possible, greatly improving productivity. Since the long pipe held by the holding table is centered by passing through the guide tube and rotated by the holding rotation roller, cutting by the pipe force lid can be easily and quickly performed. The cutting length is set when the cut surface of the pipe comes into contact with the contact member, and the cutting length can be adjusted arbitrarily by the cutting length adjustment mechanism. The tailstock head holding mechanism allows the tailstock head to face and abut the long pipe without being eccentric to the axis of the long pipe, allowing the long pipe to be pressed and moved appropriately. The abutment member reciprocating mechanism allows the abutment member to be moved back and forth between the cutting length setting position and the retracted position, thereby avoiding unnecessary parts from coming out and unnecessary cutting operations. The guide member prevents relative runout between the forward pipe and the rear pipe, stabilizes the continuous movement of the pipe, and enables proper cutting work. The tailstock head lowering mechanism quickly lowers the tailstock head to the bottom dead center, avoiding uncertain rotation of the pipe, ensuring proper cutting conditions and improving product accuracy. The power intermittent mechanism stops the conveyor during high loads,
Since the conveyor can be operated under low load and the power supply can be operated at all times, the startup speed of the conveyor from a stopped state to an operating state is increased, which contributes to improved productivity and reduces the length of time when the conveyor is stopped. Because the pressing force of the shaku pipe, that is, the pressing force that presses the cut surface of the pipe against the contact member by the tailstock head, can be kept constant at all times.
Product accuracy is improved because there is no variation in the set length of the product.

[Brief explanation of drawings]

Figures 1 to 14F show embodiments of the present invention;
The figure is a schematic side view showing the overall configuration, Figure 2 is a plan view of the same, Figure 3 is a front view showing the relationship between the tailstock, conveyor frame, and tailstock head holding mechanism, and Figure 4 is a side view of the tailstock. 5 is a front view of the holding base, FIG. 6 is an explanatory front view showing the relationship between the holding rotation roller and the pipe force vine, FIG. 7 is a plan view of the holding rotation roller, and FIG. 8 is a box-shaped frame and 9 is a side view of the vicinity of the contact member, FIG. 10 is a plan view of the same, FIG. 11 is an explanatory front view showing the swing state of the contact member, and 12. The figure is an explanatory side view showing the relationship between the guide member and the starting end and the terminal end of the pipe, FIG. 13 is a schematic front view of the pipe carrying mechanism, and FIG.
Figures 14F to 14F are schematic explanatory diagrams showing the operating procedure.
Figure 5 is a schematic side view of the conventional example. l... Endless annular conveyor 2A, 2B... Psychological stamping table 3A, 3B... Holding table 4... Tailstock head holding mechanism 5... Guide tube 6... Holding rotation roller 7... - Pipe force vine 8... Pipe force vine feed mechanism 9... Hitting member l3... Input shaft 27... Tailstock head 100... Cutting length adjustment mechanism 110... Hitting member reciprocating mechanism 120...Guide member 130...Tailstock head lowering mechanism 140...Drive source 142...Output shaft 150...Power intermittent mechanism P...Pipe C1...Pipe axis C2... Axis of guide tube Figure 11 Figure 1

Claims (1)

[Claims] (1) An automatic pipe cutting device for cutting a long pipe into a predetermined length dimension, comprising an endless annular conveyor and at least one tailstock head attached to the conveyor at equal intervals and capable of being raised and lowered. A pair of tailstocks, which are mounted on the conveyor at a predetermined distance between the tailstocks, and rotate the pipe horizontally and circumferentially by orienting the axis of the pipe in the feeding direction of the conveyor. a tailstock capable of holding a tailstock head at a top dead center level capable of pressing a terminal face of a pipe held by the holding tables from an upstream end to a downstream end of the conveyor; a head holding mechanism; a guide cylinder that is disposed on the downstream side of the conveyor on an axial extension of the pipe horizontally held on the holding table and allows the pipe pressed by the tailstock head and pushed out from the conveyor to pass through; a holding rotary roller disposed downstream of the pipe that holds a part of the circumference of the pipe pushed out from the guide tube at at least two points and giving circumferential rotation to the pipe; and a holding rotary roller provided opposite to the holding rotary roller. A pipe cutter, a pipe cutter feed mechanism that reciprocates the pipe cutter from a cutting position to a non-cutting position, a contact member placed downstream of the pipe cutter and against which the cut surface of the pipe comes into contact, and adjusting the cutting length of the pipe. In order to do this, there is provided a cutting length adjustment mechanism that moves the abutment member forward and backward in the axial direction of the pipe, a cutting length setting position where the abutment member abuts against the cut surface of the pipe, and a cutting length adjustment mechanism that moves the abutment member back and forth in the axial direction of the pipe; an abutment member reciprocating mechanism that reciprocates the abutment member from the cutting length setting position to a retracted position away from the cutting length setting position when the end cutting edge is pushed out of the guide tube; a guide member that is arranged so as to be separable and that comes into contact with both pipes to prevent relative run-out between the two pipes until the terminal end of the forward pipe and the start end of the subsequent pipe are respectively fed into the guide cylinder; a tailstock head lowering mechanism that is provided at a downstream end of the tailstock head holding mechanism and lowers the tailstock head to a bottom dead center level separated from a terminal end pressing position of the pipe; a drive source that rotationally drives the conveyor; It is interposed between the output shaft of this drive source and the input shaft of the conveyor, and cuts off the power transmission to the input shaft during high load when the cut surface of the pipe is in contact with the abutment member, and the abutment member An automatic pipe cutting device characterized in that it is equipped with a power disconnection mechanism that enables power transmission to an input shaft at low loads when the end surface of the pipe does not come into contact with the input shaft.