KR101911671B1 - Automatic processing method for bending a rebar - Google Patents

Abstract

The present invention relates to a method for bending a rebar. More specifically, the present invention relates to the method for bending a rebar, comprising: a rebar holding step enabling at least one rebar to come in contact with a support body and a driving body; a bending step of enabling an end portion of the rebar to be bent based on the support body while the driving body is moved by rotation of a rotary plate; a driving body returning step of returning the driving body to an initial position by returning the rotary plate when bending operation is finished; and a rebar recovery step of recovering the bent rebar when the driving body is returned to the initial position.

Description

TECHNICAL FIELD The present invention relates to an automatic processing method for bending a rebar,

The present invention relates to a method of bending a reinforcing bar, and more particularly, to a method of bending a reinforcing bar, comprising the steps of: a step of mounting a reinforcing bar in contact with a supporting body and a movable body, A movable body returning step of returning the movable plate to the initial position by returning the rotary plate when the bending operation is completed; a step of returning the reinforcing bar to the bent plate when the movable body returns to the initial position; The present invention relates to a method of bending a reinforcing bar.

Generally, a rebar is a reinforcing bar used for reinforced concrete, and is divided into a circular reinforcing bar and a deformed reinforcing bar depending on the presence of a node on the surface.

The circular reinforcing bar means that there is no nodule on the surface of the reinforcing bar, and the deformed reinforcing bar is a reinforcing bar having a rib formed between the nodal and the node. When the deformed reinforcing bar has a greater adhesion force with the concrete than the round reinforcing bar, , The crack width is reduced, and it is generally used as a cast iron root.

These reinforcing bars may be cut or bent in various forms as required in construction or civil engineering field, and a plurality of reinforcing bars cut or bent may be combined with each other longitudinally and laterally to form a lattice frame.

In particular, in the case of bending a reinforcing bar, the prior art of a 3-head-reinforcing bar automatic feeding device of a reinforcing bar cutting and bending machine of Korean Patent Publication No. 10-948373 is known. However, since the device is bulky, There is a fear that maintenance is difficult.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide an apparatus and a method for bending reinforcing bars by performing an automated bending process, SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide an automatic reinforcing bar bending method which is simple and easy to maintain.

According to another aspect of the present invention, there is provided a method of automatically bending a steel reinforcing bar, the method comprising: a step of mounting a reinforcing bar to contact at least one reinforcing bar with a supporting body and a movable body; A movable body returning step of returning the movable plate to the initial position by returning the rotary plate when the bending operation is completed; and a step of returning the movable plate to the initial position when the movable body returns to the initial position, And a reinforcing steel collecting step.

The automatic bending and bending method of the present invention configured as described above can automatically bend a plurality of reinforcing bars by a user by performing an automatic bending process and the apparatus is compact in volume and size, It has a good installation property, and has a relatively simple structure, and performs an accurate and reliable operation, so that the maintenance of the apparatus is easy.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a photograph showing the construction of a reinforcing bar bending apparatus for performing a reinforcing bending process according to the present invention,
FIGS. 2 to 8 are photographs showing the process of bending the reinforcing bar according to the present invention.

Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings.

It is to be noted, however, that the disclosed drawings are provided as examples for allowing a person skilled in the art to sufficiently convey the spirit of the present invention. Therefore, the present invention is not limited to the following drawings, but may be embodied in other forms.

In addition, unless otherwise defined, the terms used in the description of the present invention have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. In the following description and the accompanying drawings, A detailed description of known functions and configurations that may be unnecessarily blurred is omitted.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a structural view of a reinforcing bar bending apparatus for performing a reinforcing bending process according to the present invention. Fig.

The reinforcing bar bending device (1) of the present invention is a bending device capable of bending a plurality of reinforcing bars at a time.

Referring to FIG. 1, the reinforcing bar bending apparatus 1 includes a cage 10 coupled to an upper portion of a box-shaped housing 20, a motor 20 installed inside the housing 20 at a top end of the cage 10, And a rotary plate 51 which is coupled to the shaft of the hydraulic motor and is rotated clockwise or counterclockwise according to the operation of the motor or the hydraulic motor.

A cylindrical support 40 protruding upward from the surface of the support 41 is formed on the upper side of the rotary plate 51. An extension portion 44 are formed, and the extended portion 44 is fixed to the cradle 10.

Therefore, even if the rotating plate 51 rotates, the plate 41 is fixed to the plate 10 by the extended portion 44, so that the plate 41 is not rotated.

A cylindrical movable body 50 protruding upward from the surface of the rotating plate 51 is formed on one side of the rotating plate 51. The movable member 50 is formed at a position spaced apart from the flat plate 41 formed on the upper side of the rotary plate 51.

Therefore, the movable body 50 makes a half-turn on the cradle 10 in accordance with the rotation of the rotary plate 51.

A support plate 42 extending in the vertical direction is formed on the surface of the support 41 at a predetermined distance from the support 40.

The distance between the support plate 42 and the support body 40 is formed to be longer than the diameter of one reinforcing bar so that the reinforcing bars can be interposed therebetween.

A guide bar 43 extending upwardly is attached to the distal end of the extension 44 and the guide bar 43 is fixed to the end of the extension 44 such that the reinforcing bar, To prevent it from happening.

The hinge boss 12 is formed on the bracket 11 and the hinge boss 12 is hinged by a hinge region 13 so that one end of the hinge boss 12 is hinge- And the other end of the strut 14 is attached with a pair of auxiliary bars 15. The other end of the strut 14 and the auxiliary bar 15 attached to the strut 14 are joined together, When the reinforcing bars are mounted on them, they enter the grooves formed in the extended portions 44, and when the reinforcing bars are removed, they are lifted from the grooves again. It is preferable that an elastic member (not shown) for supporting the strut 14 at the center of the body of the strut 14 is installed for the movement of the strut rim side end.

The upward and downward motion of the strut 14 functions to disperse the load pressures of the mounted reinforcing bars to prevent an excessive load from being applied to the device, thereby assisting a stable reinforcing bar bending operation.

A plate 60 is coupled to the distal end of the arm 60 and the plate 61 is coupled to the arm 60. The arm 60 is rotatably mounted on the holder 10 at a predetermined angle, And the base 62 is coupled to the lower side.

The ends of the reinforcing bars f held between the support 40 and the support plate 42 are brought into contact with the plate 61 to form a reference surface on which the reinforcing bars are mounted.

The housing 20 is installed to be able to slide on a linear rail 30 provided in a direction parallel to the housing 20 and is fixed to a specific position on the rail 30 with a handle 21 attached thereto .

At least one auxiliary cradle (70) is provided on the rail (30) to stably restrain the reinforcing bar along the length of the reinforcing bar.

Hereinafter, a method of bending a reinforcing bar by the reinforcing bar bending apparatus of the present invention having the above-described structure will be described in a remodeling manner. FIGS. 2 to 8 are photographs showing the process of bending the reinforcing bar according to the present invention.

1) Stage of ferrous installation

2, the housing 20 of the bending apparatus is fixed on the rail 30 and at least one auxiliary cradle 70 is fixed to the housing 20 along the length of the reinforcing bar f, And fixed on the rail (30) so as to be spaced apart.

A plurality of reinforcing bars f are inserted between the support 40 and the support plate 42 formed on the support 10 and are vertically mounted on the support 41.

Then, the reinforced reinforcing bars f are aligned in the longitudinal direction by the guide bars 43 formed on the extended portions 44 and are mounted.

2, the arm 60 provided on one shaft of the cradle 10 is rotated in the direction of the reinforcing bar so that one side of the plate 61 is connected to the reinforcing bars 42 between the supporting body 40 and the supporting plate 42, (f) to align the alignment reference plane of the bars (f).

When the end faces of the reinforcing bars f are aligned, the end portions of the reinforcing bars f come into contact with the body of the movable body 50.

When the ends of the reinforcing bars f are aligned by the plate 61, the arm 60 is returned to its original position as shown in FIG. 3, and the contact state between the plate 61 and the end face of the reinforcing bar f Release.

Then, the reinforcing bars f are mounted between the support body 40 and the support plate 42 in the state where the end faces are aligned as described above, and are not separated from the guide bars 43 in the aligned state.

2) Bending step

The reinforcing bars, which are fixed in the reinforcing bar mounting step, are bent at a right angle due to the movement of the movable body 50. The operation will be described in more detail as follows.

FIGS. 4, 5 and 6 are photographs showing the reinforcing bending step of the present invention. Referring to the drawings, FIG. 4 is an initial stage of bending. When the rotating plate 51 starts rotating, The movable body 50 protruding in one direction also starts to move clockwise along the rotation of the rotary plate 51. [ The end portions of the reinforcing bars f, which are placed between the support body 40 and the support plate 42 and are in contact with the body of the movable body 50, are bent due to the movement of the movable body 50 The movable member 50 is moved while the rotating plate 51 is rotated so that the end portions of the reinforcing bars f mounted between the supporting member 40 and the supporting plate 42 are moved vertically . FIG. 5 shows an intermediate step of bending, and FIG. 6 shows the ending step of bending completely. At the end of bending, the ends of the reinforced reinforcing bars are formed into a vertically bent shape in an a-letter shape.

3) Moving body returning step

When the end portion of the reinforcing bar is bent in the vertical direction and the bending operation is completed in the bending step, the rotary plate 51 is rotated counterclockwise and returned to the initial position. When the rotary body 51 rotates, Is also returned to the initial position of the above-described reinforcing bar mounting step.

4) Step of collecting steel

When the rotary plate 51 and the movable body 50 return to their initial positions as described above, the worker lifts the reinforcing bars f, whose ends are bent at the ends, between the support body 40 and the support plate 42, Is withdrawn from the bending apparatus to collect the reinforcing bars that have been subjected to the vertical bending process at the end.

After collecting the reinforcing bars, other reinforcing bars requiring bending work are placed between the supporting body 40 and the supporting plate 42, and the above-described reinforcing bar mounting step, bending step, and moving body returning step are performed to bend the reinforcing bars do.

Therefore, as described above, the bending method using the bending apparatus of the present invention is a bending method using a bending apparatus having a relatively simple structure composed of the rotating plate 5 !, the movable body 50, and the support body 40, And has an advantage that it is easy to maintain and perform accurate and reliable operation.

In addition, since the bending process itself is automated as well as the bending process itself is performed by a simple operation, the reinforcing bars can be easily bent at one time, thereby contributing to an increase in productivity.

In the present invention, the support body 40 and the movable body 50 are made of a metal material for imparting rigidity. The support body 40 and the movable body 50 are subjected to heat due to continuous external force and friction, It is preferable to provide an appropriate protection means because water may be contacted due to washing or the like.

The present invention is characterized in that it can be provided with a coating layer formed by coating and curing a coating agent on the outer surface of a support or a movable body or both.

Such a coating layer is required to have improved flame retardancy, improved manufacturability due to rapid curing, and improved water resistance through water-repellent treatment as well as prevention of breakage due to impact, spatter due to sharp objects, and the like.

The coating composition of the present invention which provides the above-mentioned effect comprises 100 parts by weight of a binder resin, 1 to 10 parts by weight of an isocyanate prepolymer, 1 to 30 parts by weight of a polyester acrylate, 30 to 60 parts by weight of azobisisobutyronitrile, 0.5 to 5 parts by weight of azobis isobutyronitrile, 5 to 15 parts by weight of aluminum hydroxide, 1 to 5 parts by weight of dimethylaniline, 0.5 to 2.5 parts by weight of tetraethoxysilane.

For each constitution, it is preferable that the binder resin is first made of UV curing type, and the kind thereof is not particularly limited.

Next, the isocyanate prepolymer can be obtained by modifying a compound having two isocyanate groups by a method such as isocyanurate denaturation, trimethylol propane (TMP) denaturation, biuret denaturation, etc., and the binder resin If it is used in an amount of less than 1 part by weight, the crosslinking property decreases. When the amount of the crosslinking agent is more than 10 parts by weight, the crosslinking property is excessively increased, There is a problem that the possibility of breakage due to cracking increases.

Next, polyester acrylate is used as a crosslinking agent together with the above-mentioned isocyanate prepolymer. It is preferable that 1 to 30 parts by weight of the polyester acrylate is used relative to 100 parts by weight of the binder resin. When the amount is less than 1 part by weight, The surface of the coating layer is not cleanly formed, and when it is used in an amount exceeding 30 parts by weight, the crosslinking property is excessively increased and the surface of the coating layer becomes rough.

Next, methyl acetate is added as an organic solvent which ensures stable compatibility of the coating agent and provides solution polymerization. It is preferable that 30 to 60 parts by weight of the methyl acetate is used relative to 100 parts by weight of the binder resin, and 30 parts by weight , The viscosity of the coating agent becomes excessively high to deteriorate the flowability. When the coating agent is used in an amount exceeding 60 parts by weight, there is a problem that the environmental property is deteriorated or the environment regulation is seriously deteriorated.

Next, azobis isobutyronitrile is used as an initiator for radical generation. It is preferable that 0.5 to 5 parts by weight of the azobis isobutyronitrile is used relative to 100 parts by weight of the binder resin. When the amount is less than 0.5 parts by weight, sufficient radicals Ions can not be generated. When the amount is more than 5 parts by weight, there is a problem that the resulting radical ion lowers the total degree of polymerization and deteriorates the physical properties.

Next, aluminum hydroxide is added in order to prevent a specific combustion step in the process of burning the coating layer, and it is preferable that 5 to 15 parts by weight is used for 100 parts by weight of the binder resin. , The flame retardant effect is insignificant, and when used in excess of 15 parts by weight, the economical efficiency is lowered compared with the flame retardant effect.

Next, dimethylaniline is added to help radical generation of the azobisisobutylnitrile. It is preferable that 1 to 5 parts by weight of the dimethylaniline is used in 100 parts by weight of the binder resin, and less than 1 part by weight of the dimethylaniline is used It is not completely cured and when it is used in excess of 5 parts by weight, black spots or corrosion may occur on the surface of the coating layer.

Next, tetraethoxysilane is added to enhance the water repellency and water repellency of the coating layer by hydrolysis and condensation, and to improve the anticorrosive property. It is preferable that 0.5 to 2.5 parts by weight of the tetraethoxysilane is used in the range of 0.5 to 2.5 parts by weight based on 100 parts by weight of the binder resin. When used in an amount of less than 1 part by weight, the effect of improving waterproofness, water repellency and anticorrosion is insignificant, and when used in an amount exceeding 2.5 parts by weight, workability is lowered.

Hereinafter, embodiments of the coating layer using the coating composition will be described.

[Example]

As binder resin, 50 g of an isocyanate prepolymer, 200 g of polyester acrylate, 500 g of methyl acetate, 30 g of azobisisobutylnitrile, 100 g of aluminum hydroxide, 30 g of dimethylaniline and 20 g of tetraethoxysilane were added to 1 kg of epoxy acrylate oligomer And the mixture was stirred for about 1 hour to prepare a coating composition.

The coating composition thus prepared was applied to a test block (steel material) and completely cured to form a coating layer on the test block.

[Example 1]

Thereafter, the coating layer was scratched through a scratcher having irregular protruding portions and the scratches were repeatedly applied to the coating layer ten times. As a result, scratches and depression of the coating layer did not occur.

[Example 2]

Also, as a result of direct spraying of the flame on the coating layer through the torch for 10 minutes, a little soot was generated but the coating layer was not burned at all.

[Example 3]

In addition, water was sprayed on the coating layer for 6 hours, the coating layer was removed, and the degree of internal infiltration of the test block was examined. As a result, no moisture was detected.

It can be seen from the above examples that the coating layer according to the present invention is excellent in protection property, flame retardancy and waterproofness.

While the invention has been shown and described with reference to certain embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1: Bending device for performing the reinforcing bending process of the present invention
10: Bracket 11: Bracket
12: Hinge boss 13: Hin district
14: Struts
20: housing 21: handle
30: Rail
40: Support
41: Platen 42: Support plate
43: guide bar 44: extension
50: movable body 51: spindle
60: arm 61: plate
62: Female base
70: auxiliary cradle
F: Rebar

Claims (4)

A movable plate 50 which moves along the rotation of the rotary plate 51 and a movable plate 50 which is fixed on the plate 41 provided on the mounting table 10, In a method of bending a steel reinforcing bar, which is carried out by a reinforcing bar bending apparatus including a supporting body (40) protruding upward,
A reinforcing bar mounting step of contacting at least one reinforcing bar (f) with the supporting body (40) and the movable body (50);
A bending step in which the distal end portion of the reinforcing bar (f) is bent on the basis of the support body (40) while the movable body (50) is moved by the rotation of the rotary plate (51);
A movable body returning step of returning the rotary plate (51) to return the movable body (50) to an initial position when the bending operation is completed; And
A reinforcing bar collecting step of collecting the bent reinforcing bars f when the movable body 50 returns to the initial position;
Lt; / RTI >
The reinforcing bar mounting step includes:
A reinforcing bar is mounted between the supporting plate 42 and the supporting member 40,
The ends of the reinforcing bars f mounted between the uniaxial supporting body 40 of the plate 61 fixed to the arm 60 and the supporting plate 42 by rotating the arm 60 provided on one axis of the cradle 10 in the direction of the reinforcing bar So as to align the alignment reference plane of the reinforcing bars f,
After the housing 20 is fixed on the rail 30, at least one auxiliary cradle 70 is fixed on the rail 30 so as to be spaced apart from the housing 20 along the length of the reinforcing bar f,
A step 41 is provided on the upper side of the rotating plate 51 and an extended part 44 is formed on one axis of the step 41 and the extended part 44 is fixed to the stage 10, 50 are formed at a position spaced apart from the support 41 so that the support body 40 is not rotated even if the movable body 50 is rotated by the rotation of the rotation plate 51,
A guide bar 43 extending upward is attached to the distal end of the extended portion 44 so that the reinforcing bars interposed between the support body 40 and the support plate 42 are separated from the guide bar 43 in an aligned state However,
A strut 14 is hinged to a bracket 11 provided on one side of the cradle 10 and an auxiliary bar 15 is attached to a distal end of the strut 14. When the reinforcing bar is mounted on the auxiliary bar 15, And the load pressure of the mounted reinforcing bars is dispersed by performing upward and downward movement of the reinforcing bars into the grooves formed in the reinforcing bars. delete delete delete

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