JP3771338B2 - Steel pipe end masking equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for attaching a tape to a steel pipe end before applying a resin coating or coating to the steel pipe.
[0002]
[Prior art]
Steel pipes for transporting gas, oil, and water are resin-coated or painted on the outer surface, inner surface, or inner / outer surface in order to prevent the occurrence of corrosion and rust. These coatings or paints are durable that do not easily peel off.
On the other hand, the transportation pipeline is laid by connecting a coated steel pipe or a painted steel pipe by a butt welding method.
Therefore, the coated steel pipe or the coated steel pipe is shipped from the factory in a state where an uncoated (uncoated) portion having a certain length is provided at the pipe end.
[0003]
In order to provide an uncoated (unpainted) portion, a work procedure is required in which a tape called a masking tape is previously applied to the end of the steel pipe, and then a resin coating or coating is applied. In the past, the tape was manually attached. However, in recent years, the diameter of the steel pipe to be handled has increased to, for example, 60 inches (1500 mm), the working diameter has increased, and the work itself has become difficult.
[0004]
Therefore, for example, Japanese Patent Laid-Open No. 7-8855 “Automatic Masking Device for Steel Pipe End” has been proposed.
In this automatic device, as shown in FIG. 1 of the same publication, the steel pipe 2 is placed on the turning rolls 7 and 7 and the tip is pressed against the steel pipe side shift 4 and is held by the pinch roll 3, and the pipe is rotated horizontally. A masking tape (not shown) is wound around the end.
[0005]
[Problems to be solved by the invention]
However, although the automatic device is suitable for masking the outer surface, it is not possible to apply a tape to the inner surface and the end surface of the tube.
For example, in underground pipes, the outer surface may be corroded by ground water and the inner surface may be corroded by gas or oil, so inner and outer surface coating (or painting) is required. However, the automatic device cannot handle this. Is clear.
[0006]
Since the tape also serves as a protective material for preventing rusting and rusting of the pipe end during transportation and storage at the steel pipe laying site, thickness and adhesive strength are ensured. As a result, the tape is not easily peeled off.
Then, when welding the steel pipe processed with the said automatic apparatus on the laying site, a tape does not peel off easily, and time will be spent on tape peeling work.
[0007]
Accordingly, an object of the present invention is to provide an apparatus capable of applying a tape to the inner and outer surfaces and the end face of the pipe in a lump and capable of applying a tape in consideration of a tape peeling operation. .
[0008]
[Means for Solving the Problems]
In order to solve the above-described problem, claim 1 is a masking device for attaching a tape to a pipe end of a steel pipe placed horizontally on a turning roll, and a gantry movable toward the steel pipe, and a first provided on the gantry. A second winding tape holding shaft, first and second vacuum rolls that are guided by vacuum suction of the tapes drawn from the first and second winding tapes set on these tape holding shafts, and these vacuum rolls First and second swing mechanisms that move along the radial direction and circumference of the steel pipe, first and second tape cutters that cut the tape on the outlet side of the vacuum roll, and press the tape against the inner or outer surface of the steel pipe first and thereby composed of a second tape applicator roll, the first or near side out of the second tape joining roll, radially outward or radially inward direction of the tape portion protruding from the pipe end to Characterized in that a brush roll bending.
[0009]
The “inner surface” masking of the steel pipe end is performed with the first winding tape, the first vacuum roll, the first swing mechanism, the first tape cutter, and the first sticking roll, the second winding tape, the second vacuum roll, the second The “outer surface” masking of the steel pipe end is performed by the swing mechanism, the second tape cutter, and the second sticking roll. That is, since the inner and outer surfaces can be masked simultaneously, work efficiency and productivity are improved.
And since the brush roll which bend | folds the tape part which protruded from the pipe end to the outer diameter or inner diameter direction was provided in the vicinity of the exit side of the 1st or 2nd tape sticking roll, it bent the protrusion part of a tape with a brush roll, and was a pipe. The end face can be masked.
[0010]
According to a second aspect of the present invention, a tape edge folding mechanism is provided on the exit side of the first tape cutter to fold the rear end of the cut tape and bond the adhesive surfaces of the tape together.
This folded portion is not bonded to the steel pipe. The tape can be easily peeled off using the folded portion as a clue.
[0012]
According to a third aspect of the present invention, the gantry includes a pipe end tracking mechanism including a contact member that contacts the end surface of the steel pipe, and a gantry moving cylinder that constantly pushes the contact member to the end surface to cause the position of the gantry to follow the steel pipe end surface. It is characterized by.
By following the pipe end of the steel pipe, the tape can be accurately attached to the pipe end, and finishing accuracy is improved.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals. In the following description, the “end face” of the steel pipe refers to a cut surface for determining the length of the steel pipe, and the “pipe end” of the steel pipe refers to a portion near the end face.
FIG. 1 is a perspective view of a steel pipe end masking device according to the present invention. The steel pipe end masking device 1 is arranged horizontally on a turning roll 2 (... indicates a plurality, the same applies hereinafter). Is a device for affixing tape to the pipe end 4 of the steel pipe 3 placed on and rotated, rails 7, 7 laid on the foundation or base 6, a carriage 8 that moves along these rails 7, 7, and a carriage Drive motor 9, rails 11, 11 (reference numeral 11 in the back is not shown) laid on the carriage 8, a gantry 12 riding on these rails 11, 11, and pushing this gantry 12 toward the steel pipe 3 to lift the frame moving cylinder 13 and pulling, the inner surface taping mechanism 30 mounted vertically movably to the frame 12, the outer surface taping mechanism 70 and the brush roll 15 which is mounted on the bottom of the frame 12, the inner surface taping mechanism 30 Elevating And Sunda unit 16 and a mounting tube end following mechanism 20. to the frame 12.
[0014]
The pipe end following mechanism 20 includes a contact member 21 (for example, a vertically long roll) that contacts the end surface of the steel pipe 3, a cylinder 22 that moves the contact member 21 from the standby position to the normal position, and contact at the normal position. It comprises the above-mentioned gantry moving cylinder 13 which always pushes the member 21 to the end surface and causes the position of the gantry 12 to follow the end surface of the steel pipe.
[0015]
FIG. 2 is an enlarged perspective view of the inner surface tape attaching mechanism according to the present invention. The inner surface tape attaching mechanism 30 includes an elevating frame 31, a first winding tape holding shaft 32 attached to the elevating frame 31, and a tape 33 (or The first vacuum roll 34 that guides while adsorbing the inner tape 33), a first swing mechanism 40 (details will be described later) for moving the roll 34 in a two-dimensional manner, and a circled number 1 and turning to the first tape cutter 36 for cutting the tape 3 3, a cutter support bar 37 to assist the cutting operation and infested as arrows circled numeral 2, a tape edge folding mechanism 60 folded tape edge after cutting ( And a first tape sticking roll 38 that presses the tape 33 against the inner surface of the steel pipe. Reference numeral 39 denotes a rotary encoder.
[0016]
The first swing mechanism 40 attaches links 42 and 42 to a support shaft 41 extending from the elevating frame 31, passes a relay bar 43 to the tips of these links 42 and 42, and attaches other links 44 and 44. The first vacuum roll 34 is attached to the distal ends of the links 44, 44, and the bar 45 spanned in the middle of the links 44, 44 is pushed and pulled by the A cylinder 46, whereby the angle of the link 44 with respect to the link 42 changes, and the support is supported. The first vacuum roll 34 can be moved toward and away from the shaft 41, and an arm 48 is pivotally attached to the other end of the long shaft 47 that supports the A cylinder 46. A rail 51 and a slider are attached to the tip of the arm 48. The first vacuum roll 34 is guided through 52, and the B cylinder 53 attached to the lifting frame 31 If rotated over arm 48 to the shaft 47 around, it is possible to pivot the first vacuum roll 34 in the axial 47 around.
As described above, the first swing mechanism 40 is a mechanism that moves the first vacuum roll 34 two-dimensionally in the radial direction and the circumferential direction of the steel pipe by the interaction between the A cylinder 46 and the B cylinder 53.
[0017]
Since the link 42 and the link 44 are bent in a “<” shape around the relay bar 43, the first vacuum roll 34 via the relay bar 43 from the support shaft 41 even if the bending angle is changed. The length up to does not change. As a result, there is no fear that the tape 33 is loosened or torn off, and a constant tension can always be applied to the tape 33.
Although not described in detail, the support shaft 41 and the relay bar 43 are covered with sleeves so that these sleeves can freely idle. This is to prevent the tape 33 from being scratched.
[0018]
The tape edge folding mechanism 60 includes a vacuum box 62 having a plurality of suction holes 61... On the lower surface, a quarter cylinder 64 attached to the eccentric plate 63, and the quarter cylinder 64 around the point P. And a rotator 65 that rotates 180 °.
[0019]
FIG. 3 is an enlarged perspective view of the outer surface tape attaching mechanism according to the present invention. The outer surface tape attaching mechanism 70 includes a frame 71, a second winding tape holding shaft 72 attached to the frame 71, and a tape 73 (outer surface tape 73). A second vacuum roll 74 that guides while adsorbing, a second swing mechanism 80 (details will be described later) for moving the roll 74 in a two-dimensional manner, and swiveling as indicated by an arrow (3). The second tape cutter 76 that cuts 73, the second tape attaching roll 77 that presses the tape 73 against the outer surface of the steel pipe, and the cylinder unit 78 that moves the roll 77 up and down.
Reference numeral 79 denotes a cylinder unit that raises and lowers the brush roll 15.
[0020]
The second swing mechanism 80 attaches links 82 and 82 to a support shaft 81 extending from the frame 71, passes a relay bar 83 to the tips of these links 82 and 82, and attaches other links 84 and 84. The second vacuum roll 74 is attached to the tip of 84, 84, and the angle of the link 84 with respect to the link 82 is changed by pushing and pulling the bar 85 spanned in the middle of the link 84, 84 with the C cylinder 86. The second vacuum roll 74 can be moved toward and away from the arm 88, and an arm 88 is pivotally attached to the other end of the shaft 87 that supports the C cylinder 86. A rail 91 and a slider 92 are attached to the tip of the arm 88. The second vacuum roll 74 is guided, and the arm 88 is attached to the shaft 8 by a D cylinder 93 attached to the frame 71. If rotation around, it is possible to pivot the second vacuum roll 74 in the axial 87 around. As described above, the second swing mechanism 80 is a mechanism that moves the second vacuum roll 74 two-dimensionally in the radial direction and the circumferential direction of the steel pipe by the interaction between the C cylinder 86 and the D cylinder 93.
[0021]
Since the link 82 and the link 84 are bent in a “<” shape around the relay bar 83, the second vacuum roll 74 passing through the relay bar 83 from the support shaft 81 even if the bending angle is changed. The length up to does not change. As a result, there is no worry that the tape 73 is loosened or torn off, and a constant tension can always be applied to the tape 73.
[0022]
The operation of the above-described masking apparatus for the steel pipe end will be described next.
In FIG. 1, since there are two pipe ends 4 on the front and rear sides (one on the front side is not shown), two masking devices 1 are provided on the front and rear sides in principle. However, for convenience of explanation, only one masking device 1 is shown in FIG.
In FIG. 1, a steel pipe 3 is placed on turning rollers 2. The carriage 8 is run to bring the gantry 12 close to the vicinity of the pipe end 4 of the steel pipe 3.
Next, the gantry 12 is pushed out by the gantry moving cylinder 13, and the contact member 21 is brought into contact with the end surface of the steel pipe 3. When the steel pipe 3 is rotated, the end face slightly moves back and forth. However, the base 12 can always follow the end face of the steel pipe 3 by the operation of the pipe end following mechanism 20 including the contact member 21 and the base moving cylinder 13. .
[0023]
4 (a) and 4 (b) are first operation explanatory views of the inner surface tape attaching mechanism.
(A) shows a standby state.
The inner surface tape 33 is an adhesive tape having a thickness of 0.1 to 0.4 mm, a width of 50 to 100 mm, and glue on one side.
It shows that the tape 33 drawn from the first winding tape 95 reaches the first vacuum roll 34 via the support shaft 41 and the relay bar 43. The figure shows that the tip protrudes from the first vacuum roll 34 and hangs down due to the previous cutting.
The first vacuum roll 34 is a core shaft 34a fitted with a barrel 34c having a small hole 34b... When the center of the core shaft 34a has a negative pressure, the air is sucked through the notch passage 34d, and the barrel 34c The tape 33 can be adsorbed on the outer surface.
[0024]
In (b), the A cylinder 46 is extended and the tape 33 is pressed against the inner surface of the steel pipe 3 (arrow (4)). In this state, the B cylinder 53 is operated to move the vacuum roll 34 to the arrow (5). Thus, the tape 33 can be attached to the inner surface of the steel pipe without sagging the protruding portion. Then, the A cylinder 46 and the B cylinder 53 are returned to their original positions.
[0025]
FIGS. 5A and 5B are explanatory views of the second action of the inner surface tape attaching mechanism.
In (a), when the steel pipe 3 is rotated in the clockwise direction, the tip of the tape 33 reaches the first sticking roll 38. From this time, the rotation (number) of the first sticking roll 38 is counted by the rotary encoder 39.
(B) shows that the tape 33 is attached to a little less than one round (about 330 °) of the steel pipe 3. In this state, the inner surface tape is cut and the rotation of the steel pipe 3 is stopped.
[0026]
FIGS. 6A to 6C are explanatory views of the third action of the inner surface tape attaching mechanism.
In (a), when it is time to cut, the inside of the vacuum box 62 is set to a negative pressure, and the tape 33 is adsorbed as shown by the arrow (6), while the cutter auxiliary bar 37 is extended, and the tape cutter 36 under these conditions. Down. After the tape cut, the rotation of the steel pipe 3 is stopped. The cutter auxiliary bar 37 prevents the tape 33 from escaping and the cutting becomes easy.
In (b), the 1/4 cylinder 64 is rotated 180 ° from the position of the imaginary line to the position of the solid line. The quarter cylinder 64 bends the rear end of the tape 33 and acts to paste the glue surfaces together for a certain length. During this time, since the tape 33 is fixed by the vacuum box 62, the folding operation can be carried out reliably.
In (c), the steel pipe 3 is rotated again in the clockwise direction, and when the folded portion 33a passes through the first sticking roll 38, the inner surface tape sticking operation is finished.
[0027]
FIGS. 7A and 7B are first operation explanatory views of the outer surface tape attaching mechanism.
The outer tape 73 is an adhesive tape having a thickness of 0.1 to 0.4 mm, a width of 100 to 125 mm, and glue on one side.
(A) shows a standby state, and shows that the tape 73 drawn out from the second winding tape 97 reaches the second vacuum roll 74 via the support shaft 81 and the relay bar 83. In the figure, the tip protrudes from the second vacuum roll 74 and hangs down due to the previous cutting.
The second vacuum roll 74 has the same structure as the first vacuum roll 34.
[0028]
In (b), the C cylinder 86 is extended to press the tape 73 against the outer surface of the steel pipe 3, and in this state, the D cylinder 93 is operated to move the vacuum roll 74 to the arrow (7). Thus, the tape 73 can be stuck to the outer surface of the steel pipe without sagging the protruding portion. Then, the C cylinder 86 and the D cylinder 93 are returned to their original positions.
[0029]
FIGS. 8A and 8B are explanatory views of the second action of the outer surface tape attaching mechanism.
In (a), the steel pipe 3 is rotated clockwise, and when the tip of the tape 73 passes through the second sticking roll 77, the roll 77 at the position of the imaginary line is pushed out to the position of the solid line. In (b), the rotation of the steel pipe is stopped at the timing when the tape 73 has almost gone around the steel pipe 3, and the tape 73 is cut by the second tape cutter 76. Then, the steel pipe 3 is turned again by a certain angle, and the outer surface tape attaching operation is completed.
[0030]
FIG. 9 is an operation diagram of the brush roll in the inner / outer surface masking. When the inner surface tape 33 and the outer surface tape 73 are attached to both the inner surface and the outer surface of the pipe end 4 having a groove for welding, The outer surface tape 73 is bent from the bottom to the top (from the outer surface of the steel pipe toward the center). As a result, the outer surface tape 73 is adhered to the inner surface tape 33 and the end surface of the steel pipe is sealed.
[0031]
FIG. 10 is an operation diagram of the brush roll in masking of the inner surface only. When the tape 33 is attached only to the inner surface based on the request, the inner surface tape 33 is bent from the inside of the pipe to the outside of the pipe by, for example, the brush roll 15 And it is good to cover the end face.
[0032]
Since the masking apparatus 1 according to the present invention includes the inner surface tape attaching mechanism 30 and the outer surface tape attaching mechanism 70, the tape can be applied simultaneously on the inner and outer surfaces, and one of the mechanisms 30, 70 is stopped. Since the tape can be applied only on the inner surface or only on the outer surface, the method of use is arbitrary.
Further, the above working method is only an example, and it is possible to change the work procedure or change the work content as necessary.
[0033]
Although the gantry 12 in claim 1 is mounted on the trolley 8 in the embodiment, for example, the gantry 12 can be attached to the tip of the robot arm or attached to the forklift type transport vehicle.
In the tape edge folding mechanism 60 according to the second aspect, the ¼ cylinder 64 may be replaced with another shape of the claw, and it is only necessary that the tape edge can be folded 180 °. Of course, the brush roll 15 of claim 3 may be provided not only outside the steel pipe 3 but also inside.
[0034]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
The first aspect of the present invention is a masking device for attaching a tape to a pipe end of a steel pipe placed horizontally on a turning roll. The masking device includes a gantry movable toward the steel pipe, and first and second provided on the gantry. Winding tape holding shafts, first and second vacuum rolls that are guided by vacuum suction of the tapes drawn from the first and second winding tapes set on these tape holding shafts, and these vacuum rolls with the diameter of the steel pipe First and second swing mechanisms that move along the direction and circumference, first and second tape cutters that cut the tape on the outlet side of the vacuum roll, and first that presses the tape against the inner or outer surface of the steel pipe. · together constituted by a second tape applicator roll, proximally out of the first or second tape applying roll, radially outward or radially inward direction of the tape portion protruding from the pipe end Characterized in that a brush roll bending.
Since the inner and outer surfaces can be masked at the same time, work efficiency and productivity are improved.
And since the brush roll which bend | folds the tape part which protruded from the pipe end to the outer diameter or inner diameter direction was provided in the vicinity of the exit side of the 1st or 2nd tape sticking roll, it bent the protrusion part of a tape with a brush roll, and was a pipe. The end face can be masked.
[0035]
According to a second aspect of the present invention, a tape edge folding mechanism is provided on the exit side of the first tape cutter to fold the rear end of the cut tape and bond the adhesive surfaces of the tape together.
This folded portion is not bonded to the steel pipe. The tape can be easily peeled off using the folded portion as a clue.
[0037]
According to a third aspect of the present invention, the gantry includes a pipe end tracking mechanism including a contact member that contacts the end surface of the steel pipe, and a gantry moving cylinder that constantly pushes the contact member to the end surface to cause the position of the gantry to follow the steel pipe end surface. It is characterized by.
By following the pipe end of the steel pipe, the tape can be accurately attached to the pipe end, and finishing accuracy is improved.
[Brief description of the drawings]
1 is a perspective view of a steel pipe pipe end masking device according to the present invention. FIG. 2 is an enlarged perspective view of an inner surface tape attaching mechanism according to the present invention. FIG. 3 is an enlarged perspective view of an outer surface tape attaching mechanism according to the present invention. FIG. 4 is an explanatory diagram of the first action of the inner surface tape attaching mechanism. FIG. 5 is an explanatory diagram of the second action of the inner surface tape attaching mechanism. FIG. First action explanatory diagram [FIG. 8] Second action explanatory diagram of the outer surface tape attaching mechanism [FIG. 9] Operational diagram of the brush roll in the inner / outer surface masking [FIG. 10] Explanation】
DESCRIPTION OF SYMBOLS 1 ... Steel pipe end masking device, 2 ... Turning roll, 3 ... Steel pipe, 4 ... Pipe end, 8 ... Bogie, 12 ... Mount, 13 ... Mount moving cylinder, 15 ... Brush roll, 20 ... Pipe end tracking mechanism, 21 DESCRIPTION OF SYMBOLS Contact member, 30 ... Inner surface tape sticking mechanism, 32 ... First winding tape holding shaft, 33 ... Tape (inner surface tape), 33a ... Folding part, 34 ... First vacuum roll, 36 ... First tape cutter, 38 ... First 1 tape affixing roll, 40 ... first swing mechanism, 60 ... tape edge folding mechanism, 62 ... vacuum box, 64 ... 1/4 cylinder, 70 ... external tape affixing mechanism, 72 ... second tape holding shaft, 73 ... tape (External tape), 74 ... second vacuum roll, 76 ... second tape cutter, 77 ... second tape application roll, 80 ... second swing mechanism, 95 ... first winding tape, 9 ... the second winding tape.

Claims (3)

This is a masking device that attaches tape to the end of a steel pipe placed horizontally on a turning roll. The base is movable toward the steel pipe, the first and second winding tape holding shafts provided on the base, and these tapes. The first and second vacuum rolls that are guided by vacuum suction of the tape drawn from the first and second winding tapes set on the holding shaft, and these vacuum rolls move along the radial direction and the circumference of the steel pipe. The first and second swing mechanisms, the first and second tape cutters that cut the tape on the outlet side of the vacuum roll, and the first and second tape affixing rolls that press the tape against the inner or outer surface of the steel pipe. , The inner surface masking of the pipe end is carried out with the first winding tape, the first vacuum roll, the first swing mechanism, the first tape cutter and the first sticking roll, and the second winding Tape, a second vacuum roll, the second swing mechanism, the masking device of steel pipe end to implement the outer surface masking steel pipe ends at the second tape cutter and the second joining roll,
A steel pipe end masking device , characterized in that a brush roll is provided in the vicinity of the exit side of the first or second tape sticking roll to bend the tape portion protruding from the end of the pipe outward or inward .   2. The steel pipe end masking according to claim 1, wherein a tape edge folding mechanism is provided on the outlet side of the first tape cutter to fold the rear end of the cut tape and bond the adhesive surfaces of the tape together. apparatus.   The gantry includes a pipe end tracking mechanism comprising a contact member that contacts an end surface of a steel pipe, and a gantry moving cylinder that constantly pushes the contact member to the end surface and tracks the position of the gantry on the steel pipe end surface. The steel pipe pipe end masking device according to claim 1.

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