JP3648649B2 - Rebar bending hook processing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to a technical field for bending hooks of reinforcing bars used in construction and civil engineering work of reinforced concrete structures.
[0002]
[Prior art]
FIG. 2 is a view for explaining bending hook processing of crossed reinforcing bars. A plurality of main bars 3 are arranged in the vertical direction at the intersection of the column steel frame 1 and the beam steel frame 2, and a shear reinforcing bar 4 is arranged in the horizontal direction around the main bar 3 so as to intersect therewith. At this time, both ends of the shear reinforcing bar 4 are bent to 135 ° as shown in FIGS. 2 (A) to 2 (B). 2. Description of the Related Art Conventionally, a handy type that can bend and hook a reinforcing bar at a current position using a hydraulic cylinder is known.
[0003]
[Problems to be solved by the invention]
However, the above-mentioned conventional one can bend the D16 rebar up to 135 ° at a time, but there are the following problems when attempting to bend a rebar with a diameter larger than D16.
[0004]
(1) In the case of bending hooks for reinforcing bars, the Japan Society of Civil Engineers Standard Specification specifies the bending inner radius as 2φ to 3φ (φ is the diameter of the reinforcing bar; it depends on the material of the deformed reinforcing bar) D19 and D22 are 3 mm and 6 mm thicker than D16, respectively, and the predetermined bending inner radius is 6 to 9 mm at D19 and 12 to 18 mm larger at D22. For this reason, when bending, the stroke of the hydraulic cylinder is required to be long, and the length of the stroke is insufficient with the conventional processing machine.
[0005]
{Circle around (2)} Even if a hydraulic cylinder with a long stroke is used, the apparatus becomes large and heavy, and handling becomes worse when used at the current position.
[0006]
(3) Instead of using a hydraulic cylinder with a long stroke, it may be possible to increase the length of the arm. However, if the roller at the end of the arm is small as it is and the reinforcing bar to be bent becomes thick, During processing, it is difficult to grip the reinforcing bars, and the reinforcing bars may come off. In addition, the roller at the tip may be displaced from the side of the reinforcing bar to the general part, the hydraulic pressure fluctuates due to the shock, the cylinder does not move smoothly, and the cycle time of the bending work is prolonged.
[0007]
The present invention has been made to solve the above-described problems, and an object thereof is to provide a bending hook processing of a reinforcing bar that can be easily performed even with a large diameter reinforcing bar with a small and light handy type.
[0008]
[Means for Solving the Problems]
For this purpose, the rebar bending hook processing machine according to the present invention includes a hydraulic cylinder 11, a pair of hook plates 14 fixed to the hydraulic cylinder 11, and a vertical extension with respect to the hook plate 14. A swing arm 16 pivotally attached to the piston 15, a large-diameter bending roller 19 pivotally attached to one end of the swing arm 16, and a pivot on the other end of the swing arm 16. A small-diameter guide roller 20 that is pivotally mounted, grips one rebar 3 by the hook plate 14, bends the other rebar 4 by the bending roller 19, and the other rebar by the guide roller 20. 4 is configured to receive a reaction force in the bending process. In addition, the number added to the said structure is for contrast with drawing in order to make an understanding of this invention easy, and, thereby, the structure of this invention is not limited at all.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows one embodiment of a reinforcing bar bending hook machine of the present invention, FIG. 1 (A) is a side view, and FIG. 1 (B) is a plan view. In the following description, “upper and lower” and “left and right” are those in FIG. 1A and are not related to the actual use state.
[0010]
In FIG. 1, the bending hook processing machine 10 has a hydraulic cylinder 11. A hydraulic hose connection port 12 and a push button switch 13 are provided on one side of the hydraulic cylinder 11, and a pair of hook plates 14 are fixed to the other side of the hydraulic cylinder 11. A hook portion 14 a for gripping the main muscle 3 is formed at the tip of the hook plate 14. The hydraulic cylinder 11 is provided with a piston 15 that can be expanded and contracted. A bifurcated swinging arm 16 that is curved in the vertical direction is pivotally attached to a pivot 17 at the tip of the piston 15.
[0011]
A large-diameter bending roller 19 is pivotally attached to the upper end of the swing arm 16, and a small-diameter guide roller 20 is pivotally attached to the lower end of the swing arm 16. When the reinforcing bars D19 and D22 are bent, the diameter of the bending roller 19 is preferably about 80 mm in consideration of the stroke length and weight of the hydraulic cylinder. As shown in FIG. 1B, a recess 19 a having a circular arc cross section is formed on the outer peripheral surface of the bending roller 19. Similarly, a recess 20 a having a circular arc cross section is formed on the outer peripheral surface of the guide roller 20.
[0012]
Reference numeral 21 denotes an auxiliary jig for ensuring a bending inner radius, a pair of support members 21a placed on the main bars 3, 3 ', a plate 21b connected between the support members 21a, and an upper side from the plate 21b. And a notch 21d for inserting and positioning the shear reinforcing bar 4 is provided with a claw-like locking member 21c.
[0013]
The operation of the reinforcing bar bending hook processing machine of the present invention having the above configuration will be described. When the shear reinforcing bar 4 is inserted into the notch 21d of the plate 21b, the support member 21a and the locking member 21c are set on the main bar 3, and the hydraulic cylinder 11 is driven, the piston 15 and the swing arm 16 are moved to the left in the drawing. The bending roller 19 comes into contact with and grips the shear reinforcement bar 4 and the bending roller 19 rotates to bend the shear reinforcement bar 4. FIG. 1A shows the position of the bending roller 19 when the bending angle of the shear reinforcing bar 4 is 90 ° or 135 °. The guide roller 20 receives a reaction force in the bending process while contacting the lower part of the shear reinforcing bar 4.
[0014]
In the present invention, since the recesses 19a and 20a having a circular arc cross section are formed on the outer peripheral surfaces of the bending roller 19 and the guide roller 20, the shear reinforcing bar 4 can be easily gripped and may be displaced during bending. Absent. In addition, since the shear reinforcing bar 4 is bent while the bending roller 19 rotates, even if the contact surface of the bending roller 19 and the shear reinforcing bar 4 is changed from the side of the reinforcing bar to the general part during bending, there is no shock and smooth. Thus, the hydraulic cylinder also operates stably, and the bending work can be performed in a predetermined time.
[0015]
Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications are possible. For example, in the above-described embodiment, the case where a shear reinforcing bar is bent is described, but the present invention can be applied to all cases where a certain bar is bent with respect to a certain reinforcing bar.
[0016]
【The invention's effect】
As is apparent from the above description, according to the present invention, it is possible to easily perform the bending hook processing even with a small and light handy type and a large diameter reinforcing bar.
[Brief description of the drawings]
FIG. 1 shows an embodiment of a reinforcing bar bending hook machine according to the present invention, in which FIG. 1 (A) is a side view and FIG. 1 (B) is a plan view.
FIG. 2 is a diagram for explaining bending hook processing of intersecting reinforcing bars.
[Explanation of symbols]
3, 4 ... Reinforcing bar, 11 ... Hydraulic cylinder, 14 ... Hook plate, 15 ... Piston 16 ... Swing arm, 19 ... Bending roller, 20 ... Guide roller 19a, 20a ... Recess, 21 ... Auxiliary jig

Claims (2)

A hydraulic cylinder, a pair of hook plates fixed to the hydraulic cylinder, a swing arm extending vertically with respect to the hook plate and pivotally attached to a piston of the hydraulic cylinder; A large-diameter bending roller pivotally attached to one end of the swing arm, and a small-diameter guide roller pivotally attached to the other end of the swing arm. A rebar bending hook processing machine characterized in that the rebar is gripped, the other rebar is bent by the bending roller, and the reaction force in the bending of the other rebar is received by the guide roller. 2. The reinforcing bar bending hook processing machine according to claim 1, wherein recesses are formed on outer peripheral surfaces of the bending roller and the guide roller.

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