JPH06177Y2 - Tubular body bending device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to a tubular body bending device for bending a hollow or solid tubular body at a predetermined angle.

(Prior Art) A tubular body is sandwiched between a central center roller and a revolving roller that revolves around the roller, and the revolving roller is revolved around the central roller so that the tubular body is rotated at a predetermined angle. 2. Description of the Related Art Conventionally, a tubular body bending device that is bent has been widely used in bending work of reinforcing bars.

(Problems to be solved by the invention) In the case of the tubular body bending device having the above-described configuration, the tubular body is bent by sandwiching the tubular body between two rollers and revolving one roller around the other roller. Since it is squeezed, there is no particular problem in the case of a solid tubular body, but in the case of a hollow tubular body, the inner and outer peripheral sides are separated from each other in the process of being bent while being sandwiched between both rollers. There is a possibility that the hollow portion in the bent portion may be abnormally deformed due to the difference in the extension of. Further, there is a problem that the workability when removing the tubular body sandwiched between the rollers after the bending is not so good.

The present invention has been made in view of the above points, and it is an object of the present invention to favorably perform bending and molding of a hollow tubular body, and to facilitate removal of the tubular body after molding.

(Means for Solving the Problems) In the invention of claim 1, as means for solving the above problems, a center roller rotatably supported on the base unit and defining the radius of curvature of the tubular body, A revolving roller on the base unit that revolves around the center roller with the tubular body sandwiched between the revolving roller and the center roller; and a revolving roller installed at an appropriate position of the base unit to revolve the revolving roller. In a tubular body bending device including a driving means that acts, a concave groove having a radius of curvature substantially equal to an outer diameter of the tubular body is formed on outer peripheral surfaces of the central roller and the revolving roller, and the central roller and At least one of the revolution rollers is provided with a notched chord portion formed by cutting a part of the outer circumference thereof in the axial direction.

According to a second aspect of the present invention, as means for solving the above-mentioned problems, in the tubular body bending apparatus according to the first aspect, a speed varying means for changing the revolution speed of the revolution roller by the driving means is additionally provided.

According to a third aspect of the present invention, as a means for solving the above-mentioned problems, in the tubular body bending apparatus according to the first or second aspect, a support frame that rotatably supports the base unit and the base unit are rotated at predetermined rotational positions. And a positioning means for positioning at.

(Operation) According to the invention of claim 1, the following effects can be obtained by the above means.

That is, by forming a concave groove having a radius of curvature substantially equal to the outer diameter of the tubular body on the outer peripheral surfaces of the central roller and the revolving roller, the extension between the inner peripheral side and the outer peripheral side during bending of the tubular body can be substantially reduced. It can be the same, and at least one of the center roller and the revolution roller,
By forming a notched chord part formed by cutting a part of the outer periphery in the axial direction, the roller having the notch chord part formed after the bending is rotated to position the notched chord part on the tubular body side. If so, the tubular body can be easily pulled out.

According to the second aspect of the invention, the following effects can be obtained by the above means.

That is, in the tubular body bending apparatus according to claim 1, the speed varying means for changing the revolution speed of the revolution roller by the driving means is additionally provided, so that the revolution speed of the revolution roller can be reduced according to the desire of the operator. .

In the device of the third aspect, the following actions can be obtained by the above means.

That is, in the tubular body bending device according to claim 1 or 2, the base unit is provided by additionally providing a support frame for rotatably supporting the base unit and a positioning means for positioning the base unit at a predetermined rotation position. By positioning at an appropriate set angle, three-dimensional bending can be easily performed on the tubular body.

(Effect of the Invention) According to the invention of claim 1, a center roller rotatably supported on the base unit and defining the radius of curvature of the tubular body, and a center roller on the base unit. A tubular body bending device including a revolving roller that revolves around the central roller with the tubular body sandwiched between the revolving roller and a drive unit that is installed at an appropriate position of the base unit and that operates to revolve the revolving roller. In the above, since the concave grooves having the radius of curvature substantially equal to the outer diameter of the tubular body are formed on the outer peripheral surfaces of the central roller and the revolving roller, respectively, the extension between the inner peripheral side and the outer peripheral side at the time of bending molding of the tubular body is achieved. Since they can be made almost the same, there is a practical effect that abnormal deformation of the hollow portion can be prevented especially during bending of a hollow tubular body. Further, since at least one of the center roller and the revolving roller is formed with a notched chord portion formed by cutting a part of the outer circumference in the axial direction, the roller having the notched chord portion is rotated after the bending molding. If the cut-out chord portion is located on the tubular body side, the tubular body can be easily pulled out, and there is an effect that the workability involved in bending and forming is extremely good.

According to the second aspect of the invention, in the tubular body bending apparatus according to the first aspect, since the speed varying means for changing the revolution speed of the revolution roller by the driving means is additionally provided, the revolution roller is in accordance with the desire of the operator. The revolution speed can be reduced, and there is an effect that the danger due to the end of the tubular body that moves together with the revolution roller during bending can be prevented.

According to a third aspect of the invention, in the tubular body bending apparatus according to the first or second aspect, a support frame for rotatably supporting the base unit and a positioning means for positioning the base unit at a predetermined rotation position are attached. Therefore, if the base unit is positioned at an appropriate set angle, the three-dimensional bending of the tubular body can be easily performed, and the tubular body can be flexibly formed to meet various requirements.

(Embodiment) Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

1 to 3 show a tubular body bending apparatus according to an embodiment of the present invention.

This tubular body bending apparatus includes a base unit 1 that constitutes a bending apparatus main body, and a support frame 2 that rotatably supports the base unit 1.

The base unit 1 is composed of a rectangular parallelepiped box, and a central shaft 3 that vertically penetrates is fixed to the central portion of the upper surface 1a thereof. On the upper side 3a of the central shaft 3, a tubular body W
A center roller 4 which defines the radius of curvature of the center roller 4 is rotatably supported, while a lower arm 3b of the center shaft 3 is provided with a rotation arm for supporting a revolution roller 5 revolving around the center roller 4. 6 is rotatably supported. A gear portion 7 that meshes with an output gear 17 that constitutes a power transmission mechanism 14 to be described later is provided on one end side of the rotary arm 6, while the center roller is provided on the upper surface 1a of the base unit 1 on the other end side. A pivot shaft 8 protruding through an arc-shaped guide groove 9 having a predetermined radius, which is formed so as to surround 4 and projects above the base unit upper surface 1a, is provided in a protruding manner. The revolving roller 5 is rotatably supported on the pivot shaft 8.

Further, on the outer peripheral surfaces of the center roller 4 and the revolution roller 5, concave grooves 4a and 5a having a radius of curvature substantially equal to the outer diameter of the tubular body W are formed, respectively. Further, in the present embodiment, the central roller 4 and the revolving roller 5 have a notched chord portion 4 formed by cutting a part of the outer circumference thereof in the axial direction.
b and 5b are formed respectively. Reference numeral 10 is a return spring for returning the rotary arm 6, 1
Reference numeral 1 is a nut for preventing the rotating arm 6 from falling off.

A motor 13 is installed on the bottom surface 1b of the base unit 1, and the rotational force of the motor 13 is transmitted via the power transmission mechanism 14 as the rotational force of the rotary arm 6. . The power transmission mechanism 14 includes a speed reducer 16 that reduces the rotation of the motor 13, and an output gear 17 that is pivotally attached to an output shaft 16 of the speed reducer 16 and meshes with a gear portion 7 of the rotary arm 6. It is composed by. That is, in the case of the present embodiment, the motor 13 and the power transmission mechanism 14 constitute the drive means 12 for rotating the rotary arm 6. The rotation angle range of the rotary arm 6 is appropriately regulated to an angle range by a bending angle setting device (not shown). Further, in the present embodiment, the motor 13 is
As shown in FIG. 4, it is connected to a power source 19 via a variable resistor 18, and by changing the resistance value of the variable resistor 18, the rotation speed of the motor 13 (in other words,
The revolution speed of the revolution roller 5) can be changed. That is, in this embodiment, the variable resistor 18 acts as a speed varying means for changing the revolution speed of the revolution roller 5. Reference numeral 20 is a main switch.

The support frame 2 is a caster for movement.
21, 21 ... Attached to the base plate 22 and the bearing plates 23 and 23 standing upright from both side ends of the base plate 22, and the bases 22 and 23 above the base. Rotating shafts 24, 24 horizontally projecting from the central portions of both side walls 1c, 1c of the unit 1 are rotatably supported. Further, each bearing plate 23 is formed with a through hole 26 through which the positioning pin 25 is inserted, while each side wall 1c of the base unit 1 has the base unit 1 in a horizontal position and inclined by 45 °. When the posture or the vertical posture is adopted, the through hole 27A corresponding to the through hole 26,
27B and 27C are formed. That is, the positioning pin 25
The base unit 1 can take a horizontal posture, a 45 ° inclined posture, or a vertical posture depending on which of the insertion holes 27, 27B, 27C is inserted through the through hole 26. Therefore, in the case of this embodiment, the positioning pin 2
5, the through hole 26 and the insertion holes 27A, 27B, 27C constitute the positioning means K.

In the drawings, reference numeral 28 is a stopper for preventing one end of the tubular body W from swinging to the opposite side in the bending direction when the tubular body W is bent and molded, and 29 is the stopper 28 and the bending position of the tubular body W. It is a scale formed to measure the dimension between.

Next, the operation of the illustrated tubular body bending device will be described.

First, as shown by the solid line in FIG. 1, a linear tubular body W is held between the center roller 4 and the revolution roller 5. At this time, the tubular body W is sandwiched between the concave groove 4a of the central roller 4 and the concave groove 5a of the revolving roller 5 as shown in FIG. When the motor 13 is driven under this state, the rotational force of the motor 13 is transmitted to the rotary arm 6 via the power transmission mechanism 14, and the rotary arm 6 is set by a bending angle setting device (not shown). It is rotated through a defined angular range (eg 90 °). Then, as the rotating arm 6 rotates, the revolving roller 5 revolves around the central roller 4, and the tubular body W sandwiched between the rollers 4 and 5 moves around the central roller 4 as a center. As shown by the chain line in Figure 1, it will be bent 90 °. In this case, the tubular body W includes the concave groove 4a of the central roller 4 and the revolution roller 5
Since it is sandwiched between the concave groove 5a and the concave groove 5a, since the extension on the inner peripheral side and the outer peripheral side at the time of bending molding become substantially equal, abnormal deformation of the hollow portion at the bent portion can be prevented. Then, when the bending of the tubular body W is completed and the driving of the motor 13 is stopped, the rotating arm 6 is reversed by the urging force of the return spring 10, and the revolving roller 5 is rotated.
Is returned to its original position. Therefore, the central roller 4
When the revolving roller 5 is rotated so that the notched chords 4b and 5b face each other as shown by the chain line in FIG. 1, the restraining force of the rollers 4 and 5 on the tubular body W is released. The tubular body W can be extracted very easily. In addition, when the rotation of the motor 13 is decelerated by the variable resistor 18 during the bending, the run-out speed of the one end side (that is, the bent side) of the tubular body W during the bending is slowed down. The degree of danger to etc. is greatly reduced.

Further, as shown in FIG. 5, the tubular body W may be three-dimensionally bent (that is, bent in the XZ direction and bent in the ZY direction). After bending in the Z direction, bending is performed in the order of bending in the ZY direction. In this case, at the time of the second bending in the Z-Y direction, the side of the tubular body W to be bent (that is, the portion bent in the X-Z direction) may be long and may touch the ground. When the base unit 1 is rotated to have an inclined posture of 45 ° as shown by the chain line in FIG. 3, it is possible to easily perform the Z-Y direction bending without fear of the above-mentioned trouble.

In the above embodiment, the center roller 4 and the revolution roller 5 are
Although the cut-out chord portions 4b and 5b are formed, the cut-out chord portions may be formed in only one of the rollers.

Further, in the above-mentioned embodiment, the one in which the hollow tubular body is bent and formed is described, but the tubular body bending apparatus of the present invention is also applicable to the case of bending and molding a solid tubular body.

Furthermore, the present invention is not limited to the configuration of the above-described embodiment, and it goes without saying that the design can be appropriately changed without departing from the spirit of the invention.

[Brief description of drawings]

1 is a plan view of a tubular body bending apparatus according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a side view of the tubular body bending apparatus shown in FIG. FIG. 4 is an electric wiring diagram of a motor in the tubular body bending apparatus shown in FIG. 1, and FIG. 5 is a perspective view showing an example of three-dimensional bending of the tubular body. 1 ... Base unit 2 ... Support frame 4 ... Central roller 4a ... Recessed groove 4b Notched chord part 5・ ・ ・ ・ ・ ・ ・ Revolution roller 5a ・ ・ ・ ・ ・ ・ Concave groove 5b ・ ・ Notched chord part 12 ・ ・ Driving means 18 ・ ・ ・ ・ Speed changing means (variable resistance Container) K ... ・ Positioning means W ・ ・ ・ ・ ・ ・ Tubular body

Claims (3)

[Scope of utility model registration request] 1. A rotatably supported on a base unit,
A center roller that defines the radius of curvature of the tubular body; a revolution roller that is on the base unit and revolves around the center roller with the tubular body sandwiched between the center roller; and the base unit. In a tubular body bending device provided with a driving means which is installed at a proper position for revolving the revolving roller, a radius of curvature substantially equal to an outer diameter of the tubular body is provided on outer peripheral surfaces of the central roller and the revolving roller. And a notched chord part formed by cutting a part of the outer periphery of the central roller and the revolving roller in the axial direction. . 2. The tubular body bending apparatus according to claim 1, further comprising speed varying means for changing the revolution speed of the revolution roller by the driving means. 3. The tubular body according to claim 1 or 2, further comprising a support frame for rotatably supporting the base unit and a positioning means for positioning the base unit at a predetermined rotation position. Bending device.