JPS61111806A - Automatic cutting machine to constant dimension for traveling pipe, etc. - Google Patents

Abstract

PURPOSE:To cut a pipe without applying an external force onto the pipe by securing the synchronous transfer of a cutting machine and the pipe, maintaining the state for detecting the top edge of the pipe by a top-edge detecting mechanism. CONSTITUTION:The top edge of a pipe 1 which advances rightward is detected by a top-edge detecting mechanism 3, and a traveling driving means 12 starts operation at the same time. Said top-edge detecting mechanism 3 feedback- controls the traveling driving means 12 so that the speed for maintaining the state for detecting the top edge of the pipe 1 can be obtained. A cutting machine 2 and the top-edge detecting mechanism 3 connected with the cutting machine 2 through a steel pipe 4 are allowed to travel on the rail 6 of a rack 5 by the traveling driving means 12. Therefore, the synchronous transfer of the cutting machine 2 and the pipe 1 is secured. Therefore, the pipe 1 is not applied with the axial compression force due to the cutting machine 2, and bending, deformation of covering resin, and breakage are not generated, and the automatic cutting to a constant dimension is permitted.

Description

Detailed Description of the Invention (Industrial Field of Application) This invention is directed to, for example, the end portion of an integrated production line for synthetic resin-coated iron pipes, in which a synthetic resin is produced that is running in an infinite length at a constant production speed. This invention relates to a device that automatically cuts coated iron pipes to size.

(Prior art and its problems, etc.) Conventionally, automatic sizing equipment for synthetic resin-coated iron pipes uses the movement of the moving pipe to push the cutting machine and ensure synchronized speeds between the pipe and the cutting machine. This made it possible to cut the same pipe.

By the way, if the pipe manufacturing speed (travel speed) was slow as in the past, about 10 m/min, there was no problem, but recently, when the pipe manufacturing speed was 100 m/min, there was no problem.
When the speed is increased to about min, the impact when the clamp of the cutting machine grips the running pipe is very large. Also,
The force required to push the cutting machine at high speed is quite large, and all of this force is applied to the pipe as axial compressive force, which can cause bends in long pipes, or unevenness or cracks in the coating resin. There is a problem that peeling occurs, resulting in defective products, or that high precision cannot be obtained due to large variations in cutting dimensions.

(Objective of the Invention) Therefore, the object of the present invention is to be able to move a cutting machine synchronously with the pipe without applying almost any force to the running pipe, and to be able to determine the standard length of the pipe very easily. The object of the present invention is to provide an automatic sizing cutting device for running pipes, etc., which can be changed and adjusted over a fairly wide range, and has an improved configuration that allows high accuracy in cutting the pipe dimensions.

(Structure of the Invention) In order to achieve the above object, the automatic sizing cutting device of the present invention includes: (a) a cutting machine for pipes, etc., and (b) a predetermined cutter from the cutting machine to the front side of the pipe, etc. in the running direction. (c) a tip detection mechanism located at a distance apart and detecting the tip position of the pipe, etc. (as well as the running speed of the pipe, etc.); and (c) a connecting body of a desired length that connects the cutting machine and the tip detection mechanism. It is assumed that (d) The cutting machine and the tip detection mechanism are installed so as to be movable back and forth parallel to the running direction of the pipe, etc., and (e) The cutting machine and the tip detection mechanism are moved forward at a speed synchronized with the running speed of the pipe, etc. The configuration includes a traveling drive means for returning the vehicle to its original position.

(Example) Further, to explain in more detail with the illustrated example, the first
The figure and FIG. 2 show the entire sizing automatic cutting device according to the present invention.

In the figure, 1 is a pipe manufactured on an integrated production line and runs to the right, 2 is a cutting machine, and 3 is a pipe located approximately 3 m away from the cutting machine 2 in the forward direction of the running direction of the pipe 1 (to the right in the figure). This is a mechanism for detecting the tip of the pipe 1. Cutting machine 2 and tip detection mechanism 3
are connected in series by a thin-walled steel pipe 4 with a diameter of approximately 50 mm, which serves as a connecting body.

The cutting machine 2 is installed on a pedestal 5 so that it can freely move back and forth in the left-right direction in the figure on a rail 6.6 laid parallel to the running direction of the pipe 1. A rail 9 is mounted parallel to the running direction of the pipe 1 on a roller stand 8 which is supported elevated by the pillar 7.7.
The tip detection mechanism 3 is installed on this rail 9 so as to be able to reciprocate in the left and right directions in the figure.

The roller stand 8 is for guiding the forward movement of the pipe 1 and thereby securing the distance and time necessary for cutting the pipe 1 to a specified size. For this reason, the roller stand 8 includes inclined rollers 10 that guide the falling of the pipe 1 cut to a fixed size, and undulating rollers that guide the pipe 1 moving forward and escape when the cutting of the pipe l is completed. Vertical rollers 11... are installed (see Fig. 7).

Next, FIGS. 3 and 4 show details of the structure of the cutting machine 2. FIG.

This cutting machine 2 belongs to the so-called push cutting type (
For example, Japanese Utility Model Publication No. 56-6257).

To explain this simply, the flange portion 16a at the left end in FIG.
A cam follower 32 is rotatably attached to one end of each arm plate 31, and a disc cutter 33 is rotatably attached to the other end. The cam follower 32 is brought into contact with a cam surface 34 formed on the inner peripheral surface of a cylinder that rotates in the same direction as the flange portion 16a with a slight speed difference, and as the cam lift increases due to the speed difference between the two, the disc rotates. The cutter 33 bites into the pipe 1 and cuts it.

That is, while the pipe 1 does not rotate, the disc cutter 33 rotates around the outer periphery of the pipe 1 and rotates around the pipe 1.
It penetrates and pushes through.

Therefore, there is almost no metallic sound during cutting, no chips are generated, and the cutting is done quietly and with a clean cut. However, the configuration and capabilities (functions and effects) of the cutting machine 2 are not limited to those of the above embodiment. Similarly, as long as the pipe 1 can be cut, a saw type or other known cutting machine can be used.

The base 17 of the cutting machine 2 is as shown in FIG.
The cutting machine 2 and the tip detection mechanism 3 are rigidly connected in series with a base 40 of a travel drive means 12 that moves the cutting machine 2 and the tip detection mechanism 3 forward at a speed synchronized with the traveling speed of the pipe 1 or retreats back to the original position. Break the sliders 35 and 41 respectively, and these are the left and right rails 6.
．． 6, and is capable of reciprocating in the direction perpendicular to the paper plane of FIG.

As the travel drive means 12, it is mounted on the pedestal 5 parallel to the rail 6! 142 is installed, and the output shaft 43 and pinion 44 of the servo motor 43 installed on the base 40 are meshed with the rack 42.

That is, the cutting machine 2 and the like are reciprocated at a speed proportional to the magnitude of the input signal applied to the servo motor 43.

Note that, instead of the above-mentioned rack and pinion type, a screw type using a feed screw and a cheat can be adopted as the travel drive means 12 in exactly the same manner.

Next, FIGS. 5 to 7 show the details of the configuration of the tip detection mechanism 3 of the pipe 1.

In the figure, reference numeral 50 denotes a tip detection plate that is provided so as to protrude substantially perpendicularly to the running path of the pipe 1 so that the tip of the pipe 1 collides with the plate. Its base end portion is rotatably attached to a movable table 52 by a pin 51. The slider 53 of the movable table 52 straddles the rail 9 (FIG. 6) and is capable of reciprocating movement.

In the figure, reference numeral 54 denotes a pneumatic cylinder (or a hydraulic cylinder, electric cylinder, or other actuator) that raises and rotates the tip detection plate 50, and a bracket 54 on the moving base 52
5 through a trunnion shaft 56. The piston rod 54a is connected to the intermediate portion of the tip detection plate 50 by a pin 57.

That is, when cutting the pipe 1 to a fixed size is completed, the hydraulic cylinder 54 releases the tip detection plate 50 from the pipe 1, allowing the pipe 1 to fall easily and reliably.

In the figure, 60 is located adjacent to the rear side of the moving table 52,
This is a second moving platform installed on the rail 9 so as to be able to reciprocate. This second moving table 60 is connected to the above-mentioned front moving table 52 by a tension spring 61 having a strength that does not apply much force to the pipe 1.

In addition, the second movable table 60 has holders 62 and 62.
A differential transformer 63 is mounted parallel to the rail 9. The movable shaft 63a is coupled to the front movable table 52.

That is, when the pipe 1 collides with the tip detection plate 50 and travels forward together with the front movable base 52, it is detected by the differential transformer 63 attached to the second movable base 60, and the detection output is sent to the travel drive means 12. It is used for acceleration/deceleration control of the servo motor 43. Through such feedback control, the differential transformer 63 reaches the zero point, and the pipe 1 and cutting machine 2
This results in a synchronous speed of .

Therefore, a rotary encoder, a magnetic encoder, or the like can be used in place of the differential transformer 63 as long as it is a sensor capable of measuring the amount of change in the front and rear movable tables 52 and 60.

Next, 70 in the figure is on the above-mentioned rail 9 and is on the second
This is a third movable base that is installed adjacent to the rear side of the movable base 60 so as to be movable back and forth. A servo motor 71 is installed on the third moving table 70, and a pinion 72 attached to its rotating shaft is engaged with a rack 74 of a size adjusting tube 73 (FIG. 7).

The size adjustment tube 73 is connected to a bladder 64 provided at the rear end of the second moving table 60, and is arranged parallel to the rail 9 on the left side in FIG. The length of this size adjusting tube 73 is, for example, about 15 m. Moreover, the steel pipe 4 serving as the above-mentioned connecting body is coupled to a bracket 75 provided at the rear end of the third movable table 70. The adjusting tube 73 is telescopically inserted and supported in the steel pipe 4 so that it can be expanded and contracted. Therefore, by driving and controlling the servo motor 71, the pipe 1 can be cut within the length limit of the adjusting tube 73. The standard size can be freely changed and adjusted.

In addition, the cutting machine 2 that traveled forward at the same speed as the pipe 1,
It is temporarily stopped at the position where the pipe 1 has been completely cut, and then rapidly moved backward to the original position by the action of the servo motor 43. At this time, the third moving table 70 is indexed by the steel pipe 4, the second moving table 60 is indexed by the size adjusting tube 73, and the moving table 52 is indexed by the measuring tube 73.
are indexed by the tension spring 61 and return to their original positions.

In addition, as shown in detail in FIGS. 5 and 7, the inclined roller 1
The shafts of the vertical rollers 11 installed adjacent to the rollers 11 are cantilevered by a lever 80. The base end of the lever 80 is a drive mechanism that is disposed below the pipe 1 parallel to the running direction of the pipe 1 and rotatably supported by a bearing 81 on the roller stand 8. has been done. Further, a drive lever 83 is attached and fixed to the drive shaft 82. On the other hand, a pneumatic cylinder 85 (however, a hydraulic cylinder, electric cylinder, or other actuator may also be used) is attached to a bracket 84 fixed to the support column 7, and its piston rod 85a is attached to the pin 8.
It is connected to the drive lever 83 at 6.

Therefore, when the cutting of the pipe 1 is completed, the contraction operation of the pneumatic cylinder 85 that receives the signal causes the vertical roller 11 to move to the inclined roller 10 as shown by the two-dot chain line in FIG.
It operates so that the cut pipe 1 rolls down along the inclined rollers 10.

(Operation and Effect) As described above in detail, according to the sizing cutting device of the present invention, the traveling drive means 12 is started at the same time as the tip of the pipe 1 is detected by the tip detection mechanism 3, and the tip is detected. The cutting machine 2 is run at a speed that maintains the state in which the tip of the pipe 1 is detected by the mechanism 3, thereby ensuring synchronized movement of the cutting machine 2 and the pipe 1, so that the pipe 1 can be cut.

Therefore, at this time, almost no external force acts on the pipe 1, so there is no burden of force. Therefore, there is no risk that the pipe 1 will be bent or the coating resin will be deformed or damaged.

Also, a connecting body 4 that connects the cutting machine 2 and the tip detection mechanism 3 is provided.
By changing and adjusting the length of the pipe 1, the standard size of the pipe 1 can be easily changed, which is very convenient.

[Brief explanation of the drawing]

1 and 2 are a plan view and a front view showing the entire automatic sizing cutting device according to the present invention, and FIGS. 3 and 4 are vertical sectional views in the front direction and side direction of the cutting machine. . Figure 5 is an enlarged plan view of the tip detection mechanism, and Figures 6 and 7 are
FIG.

Claims (1)

[Claims] (1) (a) A cutting machine (2) for pipes (1), etc., and (b)
a tip detection mechanism (3) located at a predetermined distance from the cutting machine (2) on the front side in the running direction of the pipe (1), etc., and detects the tip position of the pipe (1), etc.; It consists of a connecting body (4) of a desired length that connects the cutting machine (2) and the tip detection mechanism (3), and (d) the cutting machine (2) and the tip detection mechanism (3) are connected to the pipe (1), etc. (e) The cutting machine (2) and the tip detection mechanism (3) are connected to the pipe (
1) A running automatic sizing cutting machine for pipes, etc., characterized in that it is provided with a traveling drive means (12) for advancing at a speed synchronized with the traveling speed or for retracting and returning to the original position. (2) The tip detection mechanism (
3) includes: (a) a movable base (52) provided with a tip detection plate (50) with which the tip of a pipe or the like collides; and a second movable base connected to the movable base (52) by a tension spring (61). (60) and orbit (
(b) A sensor (63) is installed on the second moving platform (60) to measure the distance to the moving platform (52); (c) There is a third moving table (7) behind the second moving table (60).
0) is installed on the track (9) so as to be freely movable, and (d) the second moving platform (60) and the third moving platform (70) are operated by a servo motor (
(e) The third moving table (70) and the cutting machine (2) are connected by the connecting body (71).
4) A fixed-size automatic cutting device for running pipes, etc., which has a connected configuration. (3) Travel drive means (
12), a servo motor (43) is installed on a common base 40 with the cutting machine (2), and a pinion (44) rotated by the servo motor (43) is connected to the running track (2) of the cutting machine (2). 6) is configured to mesh with a rack (42) provided in parallel with the machine, and is an automatic sizing device for running pipes, etc.