JP7222051B1 - Steel pipe plating removal equipment - Google Patents

Abstract

An object of the present invention is to provide a steel pipe plating removing apparatus capable of quickly removing a plating layer of a steel pipe with a uniform width and depth. A steel pipe plating removing device (100) cuts the inner peripheral surface and the outer peripheral surface of an end portion of a steel pipe (10) with a width defined by a slide mechanism and a depth defined by a stopper member (roller). As a result, the plated layer of the steel pipe 10 can be removed with a preset uniform size. In addition, in this steel pipe plating removal apparatus 100, the rotary cutting blade 80 makes one turn along the inner peripheral surface or the outer peripheral surface of the steel pipe 10 by one rotation of the rotating part 40, and the inner peripheral surface or the outer peripheral surface of the steel pipe 10 Remove the plated layer of As a result, the plated layer can be removed more quickly than before. [Selection drawing] Fig. 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel pipe plating removal device for removing plating layers that cause problems when welding steel pipes.

For example, if a galvanized steel pipe is welded without removing the plating layer, gas containing zinc, which is harmful to the human body, is generated. This causes insufficient welding strength due to the formation of For this reason, when welding steel pipes, it is common to remove the plating layer from the welded portion. As a method of removing the plated layer, there are many methods of manually removing the plated layer by an operator using a grinder or the like. However, in addition to the poor working efficiency, manual work by workers has the problem of causing deterioration of the working environment due to the generation of dust containing zinc plating at the construction site. In addition, there is a problem that variations occur in the removal depth and width.

Here, the following [Patent Document 1] discloses an invention relating to a zinc layer removing apparatus for dissolving and removing the plating layer in the electrolyte containing layer by winding an electrolyte containing layer around a portion to be plated and energizing it. there is

JP-A-60-5900

However, in the invention described in [Patent Document 1], there is a risk of electric shock, and there is a problem that the electrolyte-containing layer needs to be periodically replaced, resulting in poor working efficiency.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a steel pipe plating removing apparatus capable of quickly removing a plated layer of a steel pipe with a uniform width and depth.

The present invention
(1) A steel pipe plating removing device for cutting and removing the plating layer of a steel pipe 10 having a plating layer on its surface from the end face by a predetermined width W,
a base portion 20; a body portion 30 installed on the base portion 20 and slidable in the longitudinal direction of the steel pipe 10; a rotating portion 40 rotatably installed on the body portion 30; A steel pipe holding portion 22 that holds the steel pipe 10 so that the axial center of the steel pipe 10 is substantially coaxial with the rotation axis of the rotating portion 40, and the rotation of the rotating portion 40 causes the steel pipe 10 to rotate along the inner peripheral surface 10a or the outer peripheral surface 10b. a rotary cutting blade 80 that rotates to cut the inner peripheral surface 10a or the outer peripheral surface 10b of the end of the steel pipe 10 with a preset width W and depth D to remove the plating layer, and the rotary cutting blade 80. A cutting portion 70 that holds the rotary portion 40 so as to be slidable in the radial direction, a pressing portion 50 that presses the rotary cutting edge 80 against the inner peripheral surface 10a or the outer peripheral surface 10b of the steel pipe 10, and the inner peripheral surface of the steel pipe 10. The above problem is solved by providing a steel pipe plating removing device 100 characterized by having a stopper member that abuts against 10a or the outer peripheral surface 10b to define the cutting depth D of the rotary cutting blade 80.
(2) The stopper member is a rotatable roller 72, and the contact surface of the roller 72 with the steel pipe 10 is recessed by the cutting depth D from the contact surface of the rotary cutting blade 80 with the steel pipe 10. The above problem is solved by providing the steel pipe plating removing apparatus 100 described in (1) above, which is characterized by being located at .
(3) The cutting part 70 further has a blade cover part 74 having an opening 74a that exposes at least half of the peripheral surface of the rotary cutting blade 80, and the opening 74a is positioned inside to allow the rotary cutting blade 80 to be rotated. The cutting edge 80 can cut the outer peripheral surface 10b of the steel pipe 10, and the rotary cutting edge 80 can cut the inner peripheral surface 10a of the steel pipe 10 by positioning the opening 74a outside. The above problems are solved by providing the steel pipe plating removing apparatus 100 described in (1) or (2) above.
(4) A cutting blade motor 82 that rotates the rotary cutting blade 80 is fixed to the body portion 30, and the rotating shaft 82a of the cutting blade motor 82 is positioned coaxially with the rotating portion 40, and the cutting blade motor 82 is rotationally driven. The force is transmitted through the winding transmission member (first winding transmission member 64a, second winding transmission member 64b) held by a plurality of link members (first link member 61a, second link member 61b). The above problem is solved by providing the steel pipe plating removing device 100 according to any one of the above (1) to (3), characterized in that the power is transmitted to the rotary cutting blade 80 by a .

The steel pipe plating removal apparatus according to the present invention cuts the inner and outer peripheral surfaces of the ends of the steel pipe with the width defined by the slide mechanism and the depth defined by the stopper member. As a result, the plated layer of the steel pipe can be quickly removed with uniform dimensions.

1 is a perspective view of a steel pipe plating removing apparatus according to the present invention; FIG. 1 is a schematic diagram showing an internal structure of a steel pipe plating removing apparatus according to the present invention; FIG. It is a schematic diagram showing the rotating mechanism of the rotating part of the steel pipe plating removing apparatus according to the present invention. 1 is an enlarged perspective view of a cutting part and related parts of a steel pipe plating removing apparatus according to the present invention; FIG. 1 is a schematic cross-sectional view of a cutting portion and related parts of a steel pipe plating removing apparatus according to the present invention; FIG. FIG. 3 is an enlarged view of a rotary cutting blade portion of the steel pipe plating removing device according to the present invention; 1 is a schematic configuration diagram of a rotation transmission mechanism of a steel pipe plating removing device according to the present invention; FIG.

A steel pipe plating removing apparatus according to the present invention will be described with reference to the drawings. Here, FIG. 1 is a perspective view of a steel pipe plating removing apparatus 100 according to the present invention. FIG. 2 is a schematic diagram showing the internal structure of the steel pipe plating removal apparatus 100. As shown in FIG.

First, the steel pipe 10, which is the object to be processed in the present invention, is a well-known steel pipe 10 that is widely used for various types of piping, and the surface (inner peripheral surface 10a, outer peripheral surface 10b) is formed with a plating layer such as galvanization. It is A steel pipe plating removing apparatus 100 according to the present invention removes a plated layer applied to the surface of a steel pipe 10 by cutting and removing it from the end face of a predetermined width, and as shown in FIG. A body portion 30 that is installed on the base portion 20 and is slidable in the longitudinal direction of the steel pipe 10, a rotating portion 40 that is rotatably installed on the body portion 30, and a shaft center of the steel pipe 10 that is installed on the base portion 20 and rotates. A steel pipe holding portion 22 that holds so as to be substantially coaxial with the rotating shaft of the portion 40; and a pressing portion 50 for pressing the rotary cutting edge 80 against the inner peripheral surface 10 a or the outer peripheral surface 10 b of the steel pipe 10 .

Next, the configuration of each part of the steel pipe plating removing apparatus 100 according to the present invention will be described. First, the pedestal portion 20 has a steel pipe holding portion 22 that holds the steel pipe 10 fixed on one side, and a body portion 30 on the other side in a slidable state. 2, a slide rail 24 for sliding the main body 30 and a slide mechanism 36 for moving the main body 30 along the slide rail 24 are installed on the side of the main body 30. By the operation of the slide mechanism 36, the body portion 30 advances or retreats toward the steel pipe holding portion 22 (steel pipe 10). The position of the body portion 30 is related to the width W of the plated layer cut by the rotary cutting blade 80 . For this reason, it is preferable that the position of the body portion 30 can be controlled with a certain degree of accuracy. and a motor 36c for rotating the .

The steel pipe holding portion 22 fixes and holds the steel pipe 10 at a predetermined position, and is preferably clamped by clamp bodies 26a and 26b having inner surfaces having the same diameter as the steel pipe 10. As shown in FIG. With this configuration, even if the steel pipe 10 is distorted and has low roundness, the distortion of the steel pipe 10 can be corrected to some extent by clamping it between the clamp bodies 26a and 26b having inner surfaces having the same diameter as the steel pipe 10. . Thereby, the plating layer of the steel pipe 10 can be cut more stably. Therefore, the clamp bodies 26a and 26b are individually manufactured for each diameter of the steel pipe 10 to be cut, and when the diameter of the steel pipe 10 to be cut changes, the corresponding clamp bodies 26a and 26b are replaced each time. is preferred. Further, the steel pipe holding portion 22 must hold the steel pipe 10 so that the axial center of the steel pipe 10 is substantially coaxial with the rotation axis of the rotating portion 40 . Therefore, the clamp bodies 26a and 26b are preferably designed so that the axial center of the steel pipe 10 is substantially coaxial with the rotating shaft of the rotating part 40 when held, taking into consideration the position of the axial center. In this configuration, by clamping and fixing the steel pipe 10 using the clamp bodies 26a and 26b corresponding to the diameter of the steel pipe 10, the axial center of the steel pipe 10 can be positioned substantially coaxially with the rotation axis of the rotating part 40 at the same time. . Further, the steel pipe holding portion 22 may have a mechanism for positioning the end face of the steel pipe 10 on the working side at a predetermined working position. Examples of this mechanism include a position sensor and an abutting system. The steel pipe 10 may be held by the steel pipe holding portion 22 automatically in combination with an automatic supply/discharge device for the steel pipe 10, or manually by an operator. Here, an example is shown in which the operator fixes the two pairs of clamp bodies 26a and 26b by screwing.

Further, as shown in FIG. 2, the body portion 30 has a substantially L-shaped cross section, and on the lower surface thereof, a slider 34 engaged with the slide rail 24 of the base portion 20 and, for example, a slider on the side of the base portion 20. A nut bracket 36b screwed onto the ball screw 36a is fixed. In addition, the vertical surface of the body portion 30 has a shaft hole for axially supporting the rotating portion 40, and a rotating portion motor 42 for rotating the rotating portion 40 and a cutting blade motor 82 for rotating the rotating cutting blade 80 are fixed. ing.

The rotating portion 40 includes a cutting portion 70 that holds the rotary cutting blade 80 , a pressing portion 50 that pushes and pulls the rotary cutting blade 80 through the cutting portion 70 , and a cutting portion 70 that extends in the radial direction of the rotating portion 40 . A machining position adjusting mechanism 90 for movement and a rotation transmission mechanism 60 for transmitting the rotational driving force of the cutting blade motor 82 to the rotary cutting blade 80 are installed. These components rotate together with the rotating portion 40 .

Here, an example of the rotating portion 40 suitable for the present invention will be described. The rotating portion 40 suitable for the present invention is constructed by fixing a front plate 41a and a rear plate 41b with a predetermined gap therebetween by means of a columnar member. A shaft tube 40a is provided at the center of the rear plate 41b, and the shaft tube 40a is rotatably supported by the body portion 30. As shown in FIG. Further, a rotary shaft 82a of a cutting blade motor 82 is inserted into the cylinder of the shaft cylinder 40a so as to pass through the shaft cylinder 40a. The shaft cylinder 40a of the rotating part 40 and the rotating shaft 82a of the cutting blade motor 82 are independent, and their respective rotating operations do not interfere with each other.

Further, as shown in the schematic diagram of the rotation mechanism of the rotating portion 40 in FIG. is fixed. A large-diameter gear 44b is coaxially fixed to the rear plate 41b with the shaft cylinder 40a. 44b to the rotating portion 40, and the rotating portion 40 rotates around the shaft tube 40a.

A slide rail 46 is fixed to the front surface of the front plate 41a, and a cutting portion 70 and a pressing portion 50 are slidably installed on the slide rail 46. As shown in FIG. Long holes 48a and 48b are provided along the radial direction of the rotating portion 40 between the slide rails 46 of the front plate 41a. Drawn inside 40. Also, a part of the blade seat portion 84 that constitutes the cutting portion 70 is pulled into the rotating portion 40 through the long hole 48b.

Further, the pressing portion 50 has a pedestal portion 52, a well-known pusher member 54 such as an air cylinder fixed to the pedestal portion 52, and a pressing shaft 56 that is pushed and pulled by the pusher member 54. The pressing shaft 56 and the blade seat portion 84 are fixed. As a result, the operation of the pusher member 54 is transmitted to the blade base portion 84 via the pressing shaft 56 , and the operation of the pusher member 54 pushes and pulls the cutting portion 70 and the rotary cutting blade 80 in the radial direction of the rotating portion 40 .

A processing position adjusting mechanism 90 is provided inside the rotating portion 40 . The machining position adjusting mechanism 90 has, for example, a ball screw 92, a rotating means 94 that rotates the ball screw 92, and a nut bracket 96 that moves as the ball screw 92 rotates. It is installed on the rotating part 40 (front plate 41a), and the nut bracket 96 is fixed to the pedestal part 52 pulled into the rotating part 40 through the long hole 48a. Therefore, when the rotating means 94 rotates, the pedestal portion 52 slides along the ball screw 92 , thereby moving the pressing portion 50 in the radial direction of the rotating portion 40 . Further, the pressing shaft 56 of the pressing portion 50 is fixed to the blade base portion 84 of the cutting portion 70, and the pressing portion 50 moves in the radial direction of the rotating portion 40, so that the cutting portion 70 is integrated with the pressing portion 50. slide to move. A motor is preferably used as the rotating means 94, but a manual handle or the like may be used. In this example, an example is shown in which the rotating means 94 is a handle that is manually rotated by the operator.

Next, the cutting portion 70 and related parts will be described. Here, FIG. 4 shows an enlarged perspective view of the cutting portion 70 and related parts, and FIGS. 5(a) and 5(b) show schematic sectional views. Also, FIG. 6 shows an enlarged view of the rotary cutting blade portion.

First, the blade seat portion 84 of the cutting portion 70 has an axial hole therein, into which the rotary cutting blade 80 and the fixed cutting blade shaft 80a are rotatably inserted. In addition, a blade cover portion 74 is installed on the front surface of the blade pedestal portion 84 (on the rotary cutting blade 80 side). has an opening 74a formed by cutting out approximately half of the . At least half of the peripheral surface of the rotary cutting blade 80 is exposed from the opening 74a. As shown in FIGS. 4 and 5A, the blade cover portion 74 is positioned so that the opening 74a faces inward so that the inner half of the peripheral surface of the rotary cutting blade 80 is exposed. Cutting of the outer peripheral surface 10b of the steel pipe 10 becomes possible. Further, as shown in FIGS. 5B and 6, by positioning the opening 74a so as to face outward, the outer half of the peripheral surface of the rotary cutting blade 80 is exposed, and the inner peripheral surface 10a of the steel pipe 10 is exposed. can be cut. It is preferable that the direction of the opening 74a is changed automatically by mechanical control, but the operator may manually change the direction of the opening 74a or rotate it halfway.

The cutting portion 70 also has a stopper member that abuts against the inner peripheral surface 10 a or the outer peripheral surface 10 b of the steel pipe 10 to stop the movement of the rotary cutting blade 80 and regulate the cutting depth D with respect to the steel pipe 10 . This stopper member is preferably provided at the tip of the blade cover portion 74, and it is particularly preferred that the stopper member be a rotatable roller 72 that is pivotally supported on the tip surface of the blade cover portion 74 in parallel with the rotary cutting blade 80. . As shown in FIG. 6, the stopper member (roller 72) has a contact surface (the outermost point of the peripheral surface of the roller 72) with which the stopper member (roller 72) contacts the steel pipe 10. (the outermost point of the blade portion of the rotary cutting blade 80) with the contact surface (the outermost point of the blade portion of the rotary cutting blade 80). The depth D is equal to or slightly larger than the thickness of the plating layer. Adjustment is possible by replacing the roller 72 . In this configuration, the rotary cutting blade 80 moves in the depth direction while cutting the plated layer of the inner peripheral surface 10a or the outer peripheral surface 10b of the steel pipe 10, and when the cutting depth reaches the specified dimension D, the roller The peripheral surface of 72 abuts on steel pipe 10 to prevent movement of rotary cutting blade 80 . As a result, the steel pipe plating removing apparatus 100 of the present invention does not cut the steel pipe 10 beyond the preset depth D, and the plating layer can be removed at a constant value of the depth D.

Next, an example of the rotation transmission mechanism 60 suitable for the rotary cutting blade 80 of the present invention will be described with reference to FIGS. 2, 5(a) and 7. FIG. Here, FIG. 7 is a schematic configuration diagram of the rotation transmission mechanism 60 viewed from the front side. In the rotation transmission mechanism 60 suitable for the present invention, the rotating shaft 82a of the cutting blade motor 82 is positioned at the center of the rotating portion 40 and pulled into the rotating portion 40 through the shaft tube 40a of the rear plate 41b. A well-known receiving member (first receiving member 62a) such as a sprocket or a pulley is fixed to the front side of the rotating shaft 82a. Also, the proximal side of the first link member 61a is rotatably fitted into the shaft tube 40a. The front side of the first link member 61a is rotatably connected to the base side of the second link member 61b via a shaft 61c. A second receiving member 62b and a third receiving member 62c are fixed to the shaft 61c. The rotation of the shaft 61c is independent of the link members 61a and 61b, and the rotational force of the shaft 61c by the second receiving member 62b and the like is not transmitted to the link members 61a and 61b. Further, the cutting blade shaft 80a penetrating through the blade base portion 84 is fixed to the fourth receiving member 62d within the rotating portion 40, and the blade base portion 84 that holds the cutting blade shaft 80a is provided with a second link member. The tip side of 61b is coaxially and rotatably connected to the cutting blade shaft 80a. The first receiving member 62a and the second receiving member 62b are connected by a well-known winding transmission member (first winding transmission member 64a) such as a chain or belt. The third receiving member 62c and the fourth receiving member 62d are connected by a similar well-known winding transmission member (second winding transmission member 64b). As a result, the rotational driving force of the cutting blade motor 82 is distributed to the rotary shaft 82a, the first receiving member 62a, the first winding transmission member 64a, the second receiving member 62b, the third receiving member 62c, and the third receiving member 62c. The power is transmitted to the cutting blade shaft 80a via the second winding transmission member 64b and the fourth receiving member 62d, and the rotary cutting blade 80 rotates.

In this rotation transmission mechanism 60, when the rotary cutting blade 80 moves in the radial direction of the rotating portion 40 due to the operation of the machining position adjusting mechanism 90 and the pressing portion 50, as shown in FIGS. The one link member 61a and the second link member 61b rotate and bend as appropriate. At this time, since the distance between the first receiving member 62a and the second receiving member 62b and the distance between the third receiving member 62c and the fourth receiving member 62d do not change, the cutting blade motor 82 is continuously transmitted even while the rotary cutting blade 80 is moving in the radial direction, and the rotary cutting blade 80 continues to rotate. Further, when the rotating portion 40 rotates, the rotation transmission mechanism 60 also rotates integrally with the cutting portion 70 and the like. However, since the rotation transmission mechanism 60 and the rotation driving force of the rotating shaft 82a are independent of each other, even while the rotation transmission mechanism 60 is rotating together with the rotating part 40, the rotation driving force of the cutting blade motor 82 is applied to the rotary cutting blade. 80 continues to be transmitted and the rotary cutting blade 80 continues to rotate. In this manner, the suitable rotation transmission mechanism 60 shown in this example allows the rotary cutting blade 80 to move radially and rotate by the rotating portion 40 while maintaining the rotation of the rotary cutting blade 80 . In this configuration, there is no need to fix the large and heavy cutting blade motor 82 to the rotating part 40 side, and the weight of the rotating part 40 can be reduced.

Next, the operation of the steel pipe plating removing apparatus 100 according to the present invention will be described. In this example, the plating layer is cut first from the outer peripheral surface 10b of the steel pipe 10, and then the plating layer of the inner peripheral surface 10a is successively cut. However, the order of cutting may be reversed. Also, after cutting the plating layer on the outer peripheral surface 10b (or the inner peripheral surface 10a) of the plurality of steel pipes 10 having the same diameter, cutting the plating layer on the inner peripheral surface 10a (or the outer peripheral surface 10b) is performed again. You can do it. In addition, the steel pipe plating removal apparatus 100 according to the present invention cuts the steel pipe 10 to a desired length in advance, removes the plating layer by the steel pipe plating removal apparatus 100, and then grooves as necessary. It is assumed that it will be welded and transported to the construction site to construct the piping.

First, in the initial state of the steel pipe plating removing apparatus 100 , the main body 30 is in a standby position sufficiently separated from the steel pipe holding portion 22 . Further, when the plating layer is removed from the outer peripheral surface 10b first, the rotary cutting blade 80 is positioned outside the steel pipe 10 (closer to the peripheral edge of the rotating portion 40). Further, the rotating part 40 is at a waiting position where the rotary cutting blade 80 is located directly below, for example.

Next, the diameter of the steel pipe 10 from which the plating layer is to be removed and the width to be removed are obtained. When the steel pipe plating removing apparatus 100 is automatically controlled, these pieces of information are input to a control unit (not shown). Next, the clamp bodies 26a and 26b are replaced with those corresponding to the diameter of the steel pipe 10 to be processed. In addition, since the plated layer is removed from the outer peripheral surface 10b of the steel pipe 10 first, the opening 74a of the blade cover 74 is set so as to face inward or is rotated by mechanical control. As a result, when the rotary cutting blade 80 is in the standby position directly below, the opening 74a is positioned above the blade cover portion 74, and the upper half of the peripheral surface of the rotary cutting blade 80 is exposed from the opening 74a. do.

Next, the steel pipe 10 is supplied to the steel pipe holder 22 by an operator or an automatic supply/discharge device for the steel pipe 10 . Then, the end face on the side from which the plated layer is to be removed is positioned at a predetermined processing position, and clamped and fixed using clamp bodies 26a and 26b. At this time, since the inner surfaces of the clamp bodies 26a and 26b are arcuate with the same diameter as the steel pipe 10, by clamping and fixing the steel pipe 10 with these clamp bodies 26a and 26b, the distortion of the steel pipe 10 is corrected to some extent and is close to a perfect circle. become a thing.

Next, the slide mechanism 36 operates to advance the body portion 30 toward the steel pipe 10 side. Then, as shown in FIG. 5(a), the tip of the rotary cutting blade 80 is advanced from the end surface of the steel pipe 10 by the width dimension W for cutting the plating layer. Next, the machining position adjusting mechanism 90 operates to slide the cutting portion 70 together with the pressing portion 50 inward so that the rotary cutting blade 80 is positioned slightly outside the outer peripheral surface 10 b of the steel pipe 10 . When the steel pipe plating removing apparatus 100 is automatically controlled, the control unit operates the machining position adjusting mechanism 90 based on the input information on the diameter of the steel pipe 10 to bring the rotary cutting blade to the above preset position. Position 80. In addition, when the operator manually operates the machining position adjusting mechanism 90, the operator positions the rotary cutting blade 80 at an appropriate position visually or using a previously set marking as a guide.

Next, the cutting blade motor 82 is activated to rotate the rotating shaft 82a. The rotational driving force of the rotating shaft 82a is transmitted to the cutting blade shaft 80a by the first and second winding transmission members 64a, 64b and the first to fourth receiving members 62a to 64d, and the rotary cutting blade 80 rotates. do.

Next, the pusher member 54 of the pressing portion 50 operates to pull the pressing shaft 56 inward. As a result, the rotary cutting blade 80 is lifted inward together with the blade pedestal 84 and pressed against the outer peripheral surface 10b of the steel pipe 10, and the contact portion with the rotary cutting blade 80 is cut. As a result, the plated layer existing on the surface of the outer peripheral surface 10b is removed. As the cutting by the rotary cutting blade 80 progresses, the peripheral surface of the roller 72, which is a stopper member, comes into contact with the outer peripheral surface 10b of the steel pipe 10, and the radial movement of the rotary cutting blade 80 stops here. As described above, the contact surface of the stopper member (roller 72) with the steel pipe 10 is recessed by the depth D from the contact surface of the rotary cutting blade 80 with the steel pipe 10. The cutting depth of the surface 10 b is the height D of the step between the contact surface of the stopper member and the contact surface of the rotary cutting blade 80 .

Around this time, the rotating part motor 42 operates, and the rotating part 40 makes one rotation around the shaft tube 40a. As a result, the rotary cutting blade 80 cuts the outer peripheral surface 10b of the steel pipe 10 while making one turn along the outer peripheral surface 10b. As a result, the plated layer on the outer peripheral surface 10b of the steel pipe 10 is cut away by a constant width W with which the rotary cutting blade 80 abuts and by a depth D defined by the stopper member.

Further, when the rotating portion 40 makes one rotation, the rotating portion motor 42 stops and the rotating operation of the rotating portion 40 stops. Next, the pusher member 54 of the pressing portion 50 pushes the pressing shaft 56 back to the initial position. As a result, the rotary cutting blade 80 is returned to the outside together with the blade pedestal portion 84 and separated from the outer peripheral surface 10b of the steel pipe 10 . Next, the cutting blade motor 82 is stopped and the rotation of the rotating cutting blade 80 is stopped. Next, the slide mechanism 36 operates to retract the main body 30 and slide it to the standby position. This completes the removal of the plating layer on the outer peripheral surface 10b of the steel pipe 10 by the steel pipe plating removing apparatus 100 according to the present invention.

Further, when the steel pipe plating removing apparatus 100 continuously removes the plating layer on the inner peripheral surface 10a of the steel pipe 10, the blade cover portion 74 is replaced so that the opening 74a faces outward, or is rotated halfway by mechanical control. be done. As a result, the lower half of the peripheral surface of the rotary cutting blade 80 is exposed from below the blade cover portion 74 when the rotary cutting blade 80 is in the standby position directly below. Further, the machining position adjusting mechanism 90 operates to position the rotary cutting blade 80 inside the inner peripheral surface 10a of the steel pipe 10 (closer to the center of the rotating portion 40).

Next, the slide mechanism 36 operates to advance the body portion 30 toward the steel pipe 10 side. Then, the rotary cutting blade 80 is inserted into the steel pipe 10, and as shown in FIG. do. Next, the machining position adjusting mechanism 90 operates manually or automatically to slide the cutting portion 70 together with the pressing portion 50 so that the rotary cutting edge 80 is positioned slightly inside the inner peripheral surface 10 a of the steel pipe 10 .

Next, the cutting blade motor 82 is activated to rotate the rotating shaft 82a. The rotational driving force of the rotary shaft 82a is transmitted to the cutting blade shaft 80a by the first and second winding transmission members 64a, 64b and the first to fourth receiving members 62a to 64d, so that the rotary cutting blade 80 is Rotate.

Next, the pusher member 54 of the pressing portion 50 operates to push out the pressing shaft 56 . As a result, the rotary cutting blade 80 is pushed outward together with the blade pedestal portion 84 and pressed against the inner peripheral surface 10a of the steel pipe 10, and the contact portion with the rotary cutting blade 80 is cut. As a result, the plated layer present on the surface of the inner peripheral surface 10a is removed. As the cutting by the rotary cutting blade 80 progresses, the peripheral surface of the roller 72, which is a stopper member, comes into contact with the inner peripheral surface 10a of the steel pipe 10, and the radial movement of the rotary cutting blade 80 stops here. The cutting depth of the inner peripheral surface 10a by the rotary cutting blade 80 at this time is the height D of the step between the contact surface of the stopper member and the contact surface of the rotary cutting blade 80 as described above.

Around this time, the rotating part motor 42 operates, and the rotating part 40 makes one rotation around the shaft tube 40a. As a result, the rotary cutting blade 80 cuts the inner peripheral surface 10a of the steel pipe 10 while making one turn along the inner peripheral surface 10a. Then, the plated layer of the inner peripheral surface 10a is cut away by a fixed width W with which the rotary cutting blade 80 abuts and by a depth D defined by the stopper member.

Further, when the rotating portion 40 makes one rotation, the rotating portion motor 42 stops and the rotating operation of the rotating portion 40 stops. Next, the pusher member 54 of the pressing portion 50 pulls the pressing shaft 56 back to the initial position. As a result, the rotary cutting blade 80 is pulled back inward together with the blade pedestal portion 84 and separated from the inner peripheral surface 10 a of the steel pipe 10 . Next, the cutting blade motor 82 is stopped and the rotation of the rotating cutting blade 80 is stopped. Next, the slide mechanism 36 operates to retract the main body 30 and slide it to the standby position. This completes the removal of the plated layer on the inner peripheral surface 10a of the steel pipe 10 by the steel pipe plating removing apparatus 100 according to the present invention.

When the plating layers on the inner peripheral surface 10a and the outer peripheral surface 10b of one end of the steel pipe 10 are removed as described above, the steel pipe 10 is turned upside down and put into the steel pipe plating removal apparatus 100 again. Then, the plated layers of the inner peripheral surface 10a and the outer peripheral surface 10b of the other end portion are removed in exactly the same manner as described above. This completes the removal of the plated layers on both ends of the steel pipe 10 .

As described above, the steel pipe plating removal apparatus 100 according to the present invention is configured such that the width W defined by the slide mechanism 36 and the depth D defined by the stopper member (roller 72) are the inner peripheral surface 10a and the The outer peripheral surface 10b is cut. As a result, the plated layer of the steel pipe 10 can be removed with a preset uniform size. In addition, in the steel pipe plating removal apparatus 100 according to the present invention, the rotary cutting blade 80 makes one turn along the inner peripheral surface 10a or the outer peripheral surface 10b of the steel pipe 10 by rotating the rotating part 40 once. The plated layer on the peripheral surface 10a or the outer peripheral surface 10b is removed. As a result, the plated layer can be removed more quickly than before.

The configuration, operation mechanism, shape, size, design, operation procedure, etc. of each part of the steel pipe plating removal apparatus 100 shown in this example are examples, and are not particularly limited to this example. Modifications can be made without departing from the gist of the invention.

10 Steel pipe
10a inner peripheral surface
10b outer peripheral surface
20 Pedestal
22 Steel pipe holder
30 main body
40 Rotating part
50 pressing part
61a first link member (link member)
61b second link member (link member)
64a first winding transmission member (winding transmission member)
64b Second winding transmission member (winding transmission member)
70 cutting part
72 roller (stopper member)
74 blade cover
74a opening
80 rotary cutting blade
100 Steel pipe plating removal device

Claims (4)

A steel pipe plating removal device for cutting and removing the plating layer of a steel pipe having a plating layer on its surface from the end face by a predetermined width,
a pedestal;
a main body installed on the pedestal and slidable in the longitudinal direction of the steel pipe;
a rotating part rotatably installed on the main body;
a steel pipe holding part that is installed on the pedestal and holds the steel pipe so that the axis of the steel pipe is substantially coaxial with the rotation axis of the rotating part;
As the rotating part rotates, it rotates along the inner peripheral surface or outer peripheral surface of the steel pipe, cuts the inner peripheral surface or outer peripheral surface of the end of the steel pipe with a preset width and depth, and removes the plating layer. a rotary cutting blade;
a cutting portion that holds the rotary cutting blade slidably in the radial direction of the rotating portion;
a pressing portion that presses the rotary cutting blade against the inner peripheral surface or the outer peripheral surface of the steel pipe;
and a stopper member that abuts against the inner peripheral surface or the outer peripheral surface of the steel pipe to regulate the cutting depth of the rotary cutting blade. The stopper member is a rotatable roller, and the contact surface of the roller with the steel pipe is recessed from the contact surface of the rotary cutting blade with the steel pipe by the cutting depth. Item 1. The steel pipe plating removal apparatus according to item 1. The cutting part further has a blade cover part having an opening that exposes at least half of the circumference of the peripheral surface of the rotary cutting blade, and the opening is positioned inside so that the rotary cutting blade cuts the outer peripheral surface of the steel pipe. 3. The apparatus for removing plating from a steel pipe according to claim 1, wherein said rotary cutting blade can cut the inner peripheral surface of said steel pipe by locating said opening on the outside. A cutting blade motor that rotates a rotary cutting blade is fixed to the main body, the rotating shaft of the cutting blade motor is positioned coaxially with the rotating portion, and the rotational driving force of the cutting blade motor is held by a plurality of link members. 4. The steel pipe plating removal device according to claim 1, wherein the power is transmitted to the rotary cutting blade through a winding transmission member.

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