JP5975232B2 - Steel pipe conveying method and conveying device - Google Patents

Description

  The present invention relates to a steel pipe transport method and a transport apparatus thereof. The present invention is intended for a steel pipe that is likely to warp along the longitudinal direction. Hereinafter, a steel pipe manufactured by applying the UOE forming technique will be described as an example.

  Steel pipes used for the use of line pipes, etc. are formed by pressing thick plates into U-shapes and O-shapes to make open pipes, and then the gaps in the open pipes are fixed by tack welding, inner surface welding, and outer surface welding. It is manufactured by joining and further undergoing various processes such as refining and inspection. Here, the open pipe refers to a pipe body in which a gap is formed between width end faces facing each other by pressing a plate material into a cylindrical shape, that is, a pipe body in which the width end face is not yet welded. Shall.

  Usually, in the manufacturing process of this type of steel pipe, a conveying facility (arrayed with V rolls or drum rolls having a narrow and narrow cross-sectional shape in which the diameter of the central part of the roll cylinder is smaller than the diameters of both ends) Hereinafter, a V-roll conveyor) is used.

However, the conventional transfer equipment has the following problems.

  That is, the steel pipe manufactured by applying the UOE forming technique finally improves the roundness and the straightness by using a pipe expander, and corrects by a local press if necessary. Quality is ensured by that. However, warping (curving, local bending) may occur along the longitudinal direction of the steel pipe due to press conditions, material differences, various welding conditions, etc. If the warping is large (downward warping, etc.) As shown in Fig. 3, the tip of the steel pipe collides with the rolls and mounts of the V-roll conveyor in the process of transporting the steel pipe, and the tip of the steel pipe is deformed or the equipment is damaged. In some cases, it became impossible to transport.

  Moreover, the roll which comprises a V-roll conveyor normally uses a drive-type roll and a non-drive-type roll suitably combining, For example, one steel pipe is used using two drive-type rolls. In the line to be transported (such as a line in which driving rolls and non-driving rolls are arranged alternately), the steel pipe is warped upward, and the transport capacity is insufficient when only one driving roll is in contact. In some cases, the steel pipe cannot be transported.

  Furthermore, the steel pipe conveyed by the V-roll conveyor moves while connecting each roll, but if the warp of the steel pipe is large, when the steel pipe transfers to the next roll, its upper and lower sides are moved as shown in FIG. The steel pipe collides with the roll due to the movement, which may be accompanied by deformation of the steel pipe, damage to the roll and the gantry. In any case, it was inevitable that the production efficiency was lowered and the line was stopped due to equipment failure.

  As a prior art regarding conveyance of a steel pipe, what was indicated by patent documents 1-5 is known, for example.

JP 2004-276073 A Japanese Patent Laid-Open No. 9-175552 Japanese Utility Model Publication No. 5-69676 JP-A-56-166326 JP-A-52-88969

  In the technique disclosed in Patent Document 1, when a UOE steel pipe is carried into an outer surface welding machine using a chain conveyor with a V-shaped seat, pins connecting adjacent chain rings of the chain conveyor drive the chain conveyor. In order to avoid the influence of the chain of the chain conveyor moving up and down when the sprocket wheel is detached or engaged, the upper chain located between the drive side sprocket wheel and the driven side sprocket wheel is connected to the center of the pin. However, the device disclosed here prevents the steel pipe from moving up and down during the outer surface welding of the steel pipe. However, it does not solve the problems caused by warpage of the steel pipe itself.

  On the other hand, the one disclosed in Patent Document 2 is to transfer a bent steel pipe or transport it to the next process. However, the guide cylinder is made to wait at the end of the previous process, and the bent elongated body is placed in the guide cylinder. Is inserted into the post-process by moving the guide tube to the beginning of the post-process, and its transport method is significantly different from that of transporting a steel pipe using a V-roll conveyor. No specific means for solving the conventional problems as described above has been proposed.

  Furthermore, Patent Document 3 is provided with a means for adjusting a suction force that the magnet exerts on the pipe transport level by arranging a magnet just below the pipe transport level on the side of the V roller. In addition, a water tank having a roll for supporting and rotating a steel pipe is immersed and used as a cooling device in the steel pipe conveyance line from the pipe mill to the reheating furnace. The horizontal roller is arranged, the elevating frame is connected to the elevating device, and is positioned below the elevating frame so as to be rotatable around the shaft mounting portion, and has a V-shaped support having guide rollers on the inner side of the tip. A frame is provided, and the V-shaped support frame is engaged with an opening / closing support device provided on the lifting frame, and the opening degree of the guide roller is adjusted in conjunction with the lifting / lowering of the lifting frame. However, in any of the techniques disclosed in these documents, when a large warp occurs in the steel pipe to be transported, the tip of the steel pipe collides with a roll or a base and damages the equipment or the steel pipe itself. The deformation of was inevitable.

  The objective of this invention exists in the place which proposes the conveyance method and conveying apparatus of the steel pipe which can convey a steel pipe smoothly, even if the steel pipe is curving in the longitudinal direction or there exists local bending.

  The present invention forms a V-roll conveyor by arranging a plurality of rolls having a body section having a medium-thin cross section whose diameter in the center in the width direction is smaller than the diameter at both ends in the width direction. In the steel pipe transport method in which the steel pipe is transported along the longitudinal direction by mutual transfer movement on each roll, the vertical displacement amount and the longitudinal position of the steel pipe involved in transport are determined on the entry side of the V-roll conveyor. The steel pipe transport method is characterized by measuring each of the steel pipe warpage and measuring the height of each roll of the V-roll conveyor based on the warpage.

  The present invention also includes a plurality of rolls arranged in a row, each having a body portion having a thin and narrow cross-sectional shape in which the diameter of the central portion in the width direction is smaller than the diameter of both end portions in the width direction, and rotatably held via bearings. A steel pipe transport device that transports the steel pipe along the longitudinal direction by mutual transfer movement on the roll, each roll being grasped on the entry side of the V roll conveyor It is a steel pipe conveying device characterized by having an elevating mechanism that changes the position in the height direction based on the warp situation of the steel pipe.

  In the steel pipe conveying apparatus having the above-described configuration, it is preferable that the V-roll conveyor is constituted by an alternating arrangement in which driving rolls and non-driving rolls are alternately arranged.

  According to the steel pipe transport method of the present invention, on the entry side of the V-roll conveyor, the warp situation along the longitudinal direction of the steel pipe involved in transport is grasped, and each roll of the V-roll conveyor is based on the warp situation. Since the height is adjusted appropriately, the steel pipe can be supported by all the rolls of the V-roll conveyor even if the steel pipe is warped, warped or S-curved, and the steel pipe is smoothly conveyed. be able to.

  Further, according to the steel pipe conveying device of the present invention, the transfer device has a roll cylinder having a narrow and narrow cross-sectional shape in which the diameter of the central portion in the width direction is smaller than the diameter of the both end portions in the width direction, and is rotated through the bearing. It is configured with a V roll conveyor in which a plurality of rolls held in a row are arranged in a row, and each roll has a height direction based on the warp situation along the steel pipe grasped on the entry side of the V roll conveyor. Since the elevating mechanism for changing the position is provided, the steel pipe can be supported over the entire length in the longitudinal direction even if the steel pipe is warped.

  Furthermore, according to the steel pipe transport device of the present invention, the rolls constituting the V-roll conveyor are arranged in an alternating arrangement in which drive rolls and non-drive rolls are alternately arranged, so the number of drive rolls can be reduced. Thus, the cost for the equipment can be reduced.

It is the figure which showed typically the structure of the suitable conveying apparatus used for implementation of the conveying method according to this invention. It is the figure which showed the front of the trunk | drum of the roll which comprises V roll conveyor. It is the figure which showed the conveyance condition of the steel pipe of a downward curvature state. It is the figure which showed the conveyance condition of the steel pipe of a warp state. It is the figure which showed the state which is conveying the steel pipe by the method according to this invention.

Hereinafter, the present invention will be described more specifically with reference to the drawings.
FIG. 1 is a diagram schematically showing an embodiment of a steel pipe conveying device according to the present invention, and FIG. 2 is a diagram showing the front of a roll body constituting a V-roll conveyor.

  Reference numeral 1 in FIG. 1 denotes a driving roll (a driving source is not shown) having a barrel section having a tapered cross-sectional shape in which the diameter in the width direction central part is smaller than the diameters at both ends in the width direction. This is a non-driving roll having a body having a cross-sectional shape equivalent to that of the roll 1.

A V roll conveyor is configured by alternately arranging the drive roll 1 and the non-drive roll 2 in a line. Here, the left side of FIG. 1 is the entry side of the V-roll conveyor, and the right side of FIG. 1 is the exit side of the V-roll conveyor.

  Reference numeral 3 denotes a pedestal that supports the drive roll 1 rotatably through a bearing, and reference numeral 4 denotes a pedestal that supports the non-drive roll 2 rotatably through a bearing.

  Each pedestal 3, 4 is provided with an elevating mechanism that can be configured by combining, for example, a hydraulic motor, an electric motor, a cylinder cylinder, or a screw jack. The height direction position of the drive roll 2 itself can be adjusted individually.

  Reference numeral 5 denotes a detector that is disposed on the entry side of the V-roll conveyor and detects the amount of displacement (bending amount) in the vertical direction of the steel pipe S involved in conveyance. As the detector 5, for example, a laser distance meter or the like can be used, and the amount of displacement of the steel pipe S in the vertical direction is detected by the detector 5. On the other hand, the position in the longitudinal direction of the steel pipe S is determined by detecting the rotational speed of the reference roll with a detector such as a pulse logic generator (PLG) or an absolute coder and using the rotational speed, that is, It is obtained by calculating the advance amount. Based on these pieces of information, the warp situation of the steel pipe S is grasped. As the reference roll, for example, the roll on the most entrance side among the rolls constituting the V-roll conveyor can be used. In this case, the detector 5 is provided above the reference roll so that the length of the steel pipe S is long. This is preferable because the relationship between the directional position and the warp amount can be obtained more accurately. In addition, in order to detect the amount of displacement (bending amount) in the vertical direction of the steel pipe S related to conveyance, the above-described laser distance meter or the like can be used, and as another embodiment, the steel pipe S moves up and down according to the bending of the steel pipe S. It is also possible to provide a touch roll, which is a possible roll, by providing the touch roll on the entry side of the V-roll conveyor and at a position as close as possible to the V-roll conveyor.

  Further, 6 is a detector (PLG, ABSOCODER, etc.) for measuring the position in the height direction of each roll of the V-roll conveyor, and 7 is a detector (magnetic detector) for detecting the tip of the steel pipe S. , Optical detector, etc.), 8 is a detector (PLG, ABSOCODER, etc.) for measuring the travel distance of the steel pipe S from the number of rotations of the roll, 9 is a warp situation of the steel pipe S and the detector 6 , 7 and 8 is a control means for adjusting the position of each roll of the V-roll conveyor in the height direction.

  In the conventional conveyance method in which the position in the height direction of each roll of the V-roll conveyor is set to be constant, when the steel pipe S is in a warped state, the tip of the steel pipe S is a roll or roll as shown in FIG. While there is a problem that the tip of the frame collides with the frame and the roll or frame is unavoidably damaged, if the steel pipe S is in a warped state, an area that does not come into contact with the drive roll may be generated. As shown in FIG. 4, when the steel pipe S is transferred to the next roll, the vertical movement of the steel pipe S collides with the roll and the steel pipe S collides with the roll. Although deformation, rolls, and pedestals were sometimes damaged, in the present invention, the warp status of the steel pipe S grasped on the entry side of the V-roll conveyor and the information obtained by the detectors 6, 7, 8 are also included. And As shown in 5, since the position in the height direction of each roll of the V-roll conveyor can be adjusted as appropriate, even if the steel pipe S is warped or locally deformed, it can be supported by all the rolls. The steel pipe S can be stably conveyed.

  In the present invention, the warp situation of the steel pipe S is grasped on the entry side of the V-roll conveyor, and the position in the height direction of the drive roll 1 and the non-drive roll 2 is adjusted based on the warp situation. However, a detector 5 is appropriately arranged between the drive roll 1 and the non-drive roll 2 of the V-roll conveyor, and the displacement amount and the longitudinal position of the steel pipe S are respectively measured by the detector 5. It is also possible to grasp the state of change of the shape during conveyance of the steel pipe S and adjust the position in the height direction of the roll located downstream based on the state of change of the shape. More stable conveyance can be performed.

  According to the present invention, even if the steel pipe is curved in the longitudinal direction or has a local bend, a transport method and a transport apparatus that can smoothly transport the steel pipe can be applied.

DESCRIPTION OF SYMBOLS 1 Drive-type roll 2 Non-drive-type roll 3 Base 4 Base 5 Detector 6 Detector 7 Detector 8 Detector 9 Control means S Steel pipe

Claims (3)

About the roll which has the trunk | drum which makes the cross section shape whose diameter of the width direction center part is smaller than the diameter of the width direction both ends, this is arranged in multiple numbers in a line, and V roll conveyor is comprised, Each of this V roll conveyor In the steel pipe conveying method of transferring the steel pipe along the longitudinal direction by its mutual transfer movement on the roll,
On the entry side of the V-roll conveyor, the amount of vertical displacement and the longitudinal position of the steel pipe involved in conveyance are respectively measured to grasp the warp situation of the steel pipe, and each roll of the V-roll conveyor is based on the warp situation. A method for conveying a steel pipe, wherein the position in the height direction of the steel pipe is adjusted as appropriate. It has a roll body having a medium-thin cross-sectional shape in which the diameter in the center in the width direction is smaller than the diameter at both ends in the width direction, and includes a V-roll conveyor in which a plurality of rolls that are rotatably held via bearings are arranged in a row , A steel pipe transfer device for transferring the steel pipe along the longitudinal direction by the mutual transfer movement on the roll,
Each said roll has a raising / lowering mechanism which changes the position of a height direction based on the curvature condition of the steel pipe grasped | ascertained in the entrance side of the said V-roll conveyor, The conveying apparatus of the steel pipe characterized by the above-mentioned.   The steel pipe transport device according to claim 2, wherein the rolls of the V-roll conveyor are alternately arranged in which drive-type rolls and non-drive-type rolls are alternately arranged.

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