JPH07148537A - Reinforcing bar bending machine - Google Patents

Abstract

PURPOSE:To provide a reinforcing bar bending machine that the torsion of a reinforcing bar is effectively straightened with a torsion straightening part and the post process of the torsion straightened part is smoothly executed. CONSTITUTION:Rotation axial centers of respective rolls 11, 12 in a torsion straightening part 1 are mutually set in the parallel positional relation, and together one side, at least, of the respective rolls 11, 12 is composed so as to be movable parallel along the rotation axial center, so the structure is made so that the change of relative position of respective rolls 11, 12 in order to apply the torsion force for straightening the torsion is free.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing bar bending machine, and more specifically, from a long rebar wound in a hoop shape,
Reinforcing bar bending used to form a large number of rebars with a desired shape through multiple steps such as unwinding into a substantially straight line, twist straightening, bending straightening, bending into a desired shape, terminal cutting with an appropriate length, etc. Regarding the machine.

[0002]

2. Description of the Related Art As such a reinforcing bar bending machine, as shown in FIG. 1, a long reinforcing bar A wound in a hoop shape is unwound to pass an intermediate passage of the reinforcing bar A which is substantially straight. The twisting force for allowing the twisting of the rebar A (the rebar A is usually wound in a hoop-like state and twisting is generated) by passing through the middle of the rebar A is applied to the rebar A. In order to provide the rolls 11 and 12, the relative positions of the rolls 11 and 12 are changeable, and the outer diameters of the rolls 11 and 12 are gradually reduced toward the middle abdomen.
A twist straightening section 1 whose main part is 12, a bend straightening section 2, 3 for straightening the bend of the rebar A whose twist has been straightened by the twist straightening section 1, and the bend straightening sections 2, 3
According to the related art, there is used a device including a bending cutting portion 4 capable of bending the reinforcing bar A whose bending has been corrected into a desired shape and cutting the end after the bending. In addition, in the twist straightening unit 1, in addition to the pair of rolls 11 and 12, the reinforcing bar A after passing through the pair of rolls 11 and 12 is used.
The roll groups 13, 14, 15, 16 are provided that allow intermediate passage of the roller and function as a reaction force receiving portion for the twisting force based on the sliding contact resistance at the time of the passage. By the way, in the conventional apparatus, in order to enable the relative positions of the rolls 11 and 12 to be changed in order to apply the twisting force, as shown in FIG. 10 and FIG. The cores 11a and 12a are set so that one of them can incline with respect to the other when viewed from the direction orthogonal to the reinforcing bar advancing direction (that is, in FIG. 11). In this way, when the rotary shaft cores 11a and 12a are set, the rotary shaft core 1
In one roll 11 in which 1a is not inclined, the middle abdomen 11d parallel to the roll end surface is a sliding contact portion with the reinforcing bar A, while in the other roll 12 in which the rotation axis 12a is inclined, The end face side portion 12d, which is deviated from the middle abdomen portion in the roll end face direction by an appropriate distance, can be used as a sliding contact portion with the reinforcing bar A. When the sliding contact portion is formed as described above, under the condition that the rotation speeds of the both rolls 11 and 12 are the same, the end surface portion 12 that is closer to the end surface than the peripheral speed of the middle abdomen portion 11d is.
Since the peripheral speed of d is higher, based on the peripheral speed difference,
The twisting force is applied to the reinforcing bar A passing through the rolls 11 and 12 in the middle.

[0003]

However, the conventional apparatus in which the rotary shaft cores 11a and 12a of the rolls 11 and 12 are set as described above has the following problems. That is, with respect to the reinforcing bar A, not only the twisting force but also the reinforcing bar A in the other roll 12 is
The moment due to the end face offset portion 12d as a sliding contact portion with the inclined end face with respect to the roll end face, that is, the moment to bend the reinforcing bar A in the vertical direction acts, and the moment Based on this, since the reinforcing bar A after passing through the twist straightening unit 1 is bent in the vertical direction, in the step immediately after the twist straightening unit 1 (specifically, the bend straightening units 2 and 3). The rebar A cannot be smoothly fed to the target position, and the post-process of the twist straightening section 1 (specifically, straightening, bending into a rectangular frame, terminal cutting at an appropriate length, etc.) However, there is a problem in that the desired reinforcing bar bending process may not be performed because it cannot be performed smoothly. The present invention has been made in view of such an actual situation, and an object thereof is to provide means capable of solving the above-mentioned problems.

[0004]

A characteristic configuration of a reinforcing bar bending machine according to the present invention (hereinafter referred to as an apparatus of the present invention) is that a long rebar wound in a hoop shape is unwound to be substantially straight. The relative position of each roll is changeable, and the relative position of each roll is changeable in order to give a twisting force for correcting the twist of the reinforcing bar to the reinforcing bar by allowing the intermediate passing of the reinforcing bar. A twist straightening part whose main part is a pair of rolls configured in a mortar shape whose diameter gradually decreases toward the middle abdomen, and a bend straightening part that corrects the bending of the rebar whose twist has been corrected by the twist straightening part. A rebar bending machine comprising: a bending cutting section capable of bending the reinforcing bar whose bending has been corrected by the bending correction section into a desired shape, and a terminal cutting after the bending, and a rotary shaft core of each roll. To be parallel to each other And at least one of the rolls is configured to be movable in parallel along the axis of rotation, the relative position of each roll for applying the twisting force can be freely changed. There is a point.

[0005]

In the apparatus of the present invention having such a configuration, the rotation shaft cores of the pair of rolls are set in a positional relationship parallel to each other, and at least one of the rolls is arranged along the rotation shaft core. Since it is configured to move in parallel,
By moving the one roll in parallel along the axis of rotation, the sliding contact portion of the one roll with the reinforcing bar can be closer to the end surface than the sliding contact portion of the other roll with the reinforcing bar. . As a result, the peripheral speed at the sliding contact portion with the reinforcing bar in the one roll can be made higher than the peripheral speed at the sliding contact portion with the reinforcing bar in the other roll,
Based on the difference in the peripheral speeds, the twisting force for straightening the twist can be applied to the reinforcing bars passing through the rolls in the middle. Moreover, since the one roll is only moved in parallel along the rotary shaft core, the one roll is moved in parallel along the rotary shaft core to make sliding contact with the reinforcing bar in the roll, Even if the roll is set closer to the end face in order to give the twisting force, the end face closer to the roll, which comes into sliding contact with the rebar, is parallel to the roll end face. As a result, when the reinforcing bar passes through the twist correction portion, in the conventional device, the moment generated due to the slidable contact portion of one roll being inclined with respect to the end surface of the roll, that is, the vertical direction of the reinforcing bar It is possible to avoid the generation of a moment that tends to bend inward.

[0006]

Therefore, when a rebar having a desired shape such as a rectangular frame shape is formed from a long rebar wound in a hoop shape by using the device of the present invention, the rebar is rewound. After that, by passing through the pair of rolls in the middle, the twisting force is applied and the twisted state is corrected, but even at the time of correction, the reinforcing bar is bent up and down as in the conventional case. Since the generation of such a moment is avoided as described above, it becomes possible to smoothly feed the reinforcing bar to the target position in the process immediately after the twist correction section. As a result, the post-process of the twist straightening section (specifically, straightening, bending into a rectangular frame shape, and cutting the terminal at an appropriate length, etc.) can be smoothly performed. As a result, a desired reinforcing bar bending process can be smoothly performed.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the portions denoted by the same reference numerals as the conventional example indicate the same or corresponding portions.

1 to 8 show an embodiment of the device of the present invention. In FIG. 1, A is a long rebar that is wound in a hoop shape on a gantry 5 and temporarily stored, and the rebar A is unwound into a substantially straight line, and then in the apparatus of the present invention. When it is sent to and is subjected to various processing in the device, it is rewound to a substantially straight line, twist correction,
Multiple processes such as bending correction, bending into a desired shape (square frame shape in this embodiment), terminal cutting at an appropriate length, etc. are performed,
A large number of the reinforcing bars A (see FIG. 9A) having the desired shape are formed. It is to be noted that the correction processing such as the bending correction is performed on the reinforcing bar A to avoid a situation where the shape of the reinforcing bar A after being subjected to the various processing does not become a desired shape (see FIG. 9B). This is because Further, in the present embodiment, in order to improve the efficiency of the work of molding a large number of the reinforcing bars A having the desired shape, the pedestal 5 for winding the long reinforcing bars A in a hoop shape and temporarily storing them is as shown in FIG. Two long rebars A, which are prepared in two and are unwound individually from the two mounts 5 to be substantially straight, are fed into the device of the present invention in parallel in the vertical direction. .

In the apparatus of the present invention, the twist straightening section 1, the bend straightening section 2, are sequentially arranged from the upstream side in the traveling direction of the two reinforcing bars A fed into the apparatus (hereinafter, simply referred to as the reinforcing bar traveling direction). 3 and the bending cutting part 4 are provided.

The twist straightening section 1 permits the intermediate passage of the two reinforcing bars A fed in parallel in the apparatus of the present invention, and the twisting of the two reinforcing bars A (the reinforcing bars A by the intermediate passage). Is a twisting force (that is, a twisting force in a direction opposite to the twisting direction) for correcting the twisting in a hoop-like state). In order to impart to the rebar A, the relative positions of the rolls 11 and 12 are freely changeable, and the outer diameters of the rolls 11 and 12 are linearly gradually reduced toward the abdomen, and are formed in a mortar shape. A pair of rolls 11 and 12 (substantially left and right in side view of the device of the present invention, the same applies hereinafter) is provided as a main part. The pair of rolls 11 and 12 are arranged so that the pair of rolls 1 and 12 can perform the twist correction of the two reinforcing bars A individually in the upper and lower directions.
As shown in FIGS. 3 and 4, each of 1 and 12 is composed of two upper and lower dividing rolls, and a total of four small rolls 1
The pair of rolls 11 and 12 is constituted by a combination of 1A, 11B, 12A and 12B.

In addition to the pair of left and right rolls 11 and 12, the twist straightening section 1 allows intermediate passage of the reinforcing bar A after passing through the pair of rolls 11 and 12, as shown in FIG. A reaction force receiving roll group R0 that functions as a reaction force receiving portion for the twisting force based on the sliding contact resistance at the time of passage is also provided. The reaction force receiving roll group R0 is the left roll 11 of the pair of left and right rolls 11, 12.
The left roll 13, which is arranged to correspond to the position of
15 and a right roll 14, 16 arranged so as to correspond to the position of the right roll 12 of the pair of left and right rolls 11, 12. The reaction force receiving roll group R0, that is, the plurality of rolls 13, 14,
Each of the pair of left and right rolls 11 and 12 is also composed of the pair of rolls 15 and 16.
Similarly to the above, the upper and lower rolls are configured so as to be able to cope with the passage of the two reinforcing bars A.

The rotation axes of the pair of rolls 11 and 12 and the rotation axis of the reaction force receiving roll group R0 (that is, the plurality of rolls 13, 14, 15 and 16) are both the twist correction section. 1 is erected on a first reference surface 17 (see FIG. 2) which is formed at the uppermost portion of the No. 1 in a state where the front surface is inclined downward.

In the twist straightening section 1 having the above-mentioned structure, the rotational axes 11a and 12a of the rolls 11 and 12 are in parallel to each other so as to impart a twisting force for straightening the twist. Is set to each roll 1
At least one of the rotary shaft cores 11a and 12a (at least one of the rolls 11 and 12 in the present embodiment)
By being configured to be movable in parallel along the direction, the relative positions of the rolls 11 and 12 for applying the twisting force can be freely changed. Therefore, by appropriately changing the relative positions of the rolls 11 and 12 so that the relative positions of the rolls 11 and 12 with respect to the reinforcing bar A are different, as shown in FIG. The sliding contact portion with and can be closer to the end surface than the sliding contact portion with the reinforcing bar A in the other roll 12. In this way, if the relative positions of the rolls 11 and 12 are set, the peripheral speed at the sliding contact portion of the one roll 11 with the reinforcing bar A is the same as the peripheral speed at the sliding contact portion of the other roll 12 with the reinforcing bar A. The peripheral speed can be made higher than the peripheral speed, and based on the peripheral speed difference, the twisting force for straightening the twist can be applied to the reinforcing bar A passing through the rolls 11 and 12 in the middle. Moreover, since the rolls 11 and 12 are only moved in parallel along the rotary shaft cores 11a and 12a, the sliding contact portion of the one roll 11 with the reinforcing bar A is twisted as described above. Even if the roll 11 is set closer to the end face in order to apply the repulsive force, the end face closer to which the roll 11 is in sliding contact with the reinforcing bar A is parallel to the roll end face. As a result, when the reinforcing bar A passes through the twist straightening section 1, in the conventional apparatus, the moment generated due to the slidable contact part of one roll being inclined with respect to the roll end surface, that is, the reinforcing bar A It is possible to avoid the generation of a moment that tends to bend up and down.

The left side rolls 13 and 15 of the plurality of rolls 13, 14, 15 and 16 as the reaction force receiving roll group R0 are fixed rolls as shown in FIG.
The remaining right rolls 14 and 16 are commonly linked to a rod of an adjusting cylinder 18 as shown in FIG. 5, and the driving position of the cylinder 18 allows the installation position of the reinforcing bar A with respect to the passing position to be changed at the same time. It is like this.

The bending correction sections 2 and 3 are specifically,
As shown in FIG. 1, it comprises a horizontal bend straightening section 2 and a vertical bend straightening section 3 which are provided with a straightening roll group R for horizontal straightening or vertical straightening. In the straightening roll group R, a plurality of pairs of right and left pairs and upper and lower double rolls are arranged at positions where the reinforcing bars A for straightening the lateral bend can freely pass while the straightening rolls R are arranged in a plurality of stages in the traveling direction. A group of lateral straightening rolls R1 provided in the lateral bending straightening unit 2 and a pair of upper and lower sides and left and right sides 2 of which axes are orthogonal to each other.
A plurality of sets of continuous rolls are arranged in combination with a group of vertical straightening rolls R2 provided in a plurality of stages in the traveling direction while being arranged at a position where the reinforcing bars A for correcting the vertical bending can be freely passed. Has been done.

The details of the lateral bending correction portion 2 are configured as shown in FIG. That is, the lateral bending correction unit 2
Is a parallel arrangement of the two rebars A whose twists have been corrected in order to correct the lateral bending of the two rebars A whose twists have been corrected by the twist correction section 1 in parallel in parallel. Rolls 21 and 2 forming a pair of left and right to allow intermediate passage
2, 23, 24, 25, and 26 are provided in multiple stages (in this example, in three stages) in the traveling direction of the reinforcing bar A. In addition, the rolls 21, 22, 23, 2 forming the left-right pair
A pair of left and right pinch rolls 27 and 28 for imparting a traveling force to the reinforcing bar A are provided on the downstream side in the traveling direction with respect to 4, 25 and 26. The adjustment of the left and right positions of the pinch rolls 27 and 28 is performed based on the operation of the manual operation units 27A and 28A associated with them. Further, the rolls 21, 22, 23, which form the left-right pair,
The right roll 22, 24, 2 of 24, 25, 26
6 is a fixed roll. Meanwhile, the remaining left roll 2
1, 23, 25 are commonly linked to the rod of the adjustment cylinder 21A, and the installation position with respect to the passage position of the reinforcing bar A is simultaneously changed by the drive control of the cylinder 21A.

Rolls 21, 22, 2 forming a pair of the left and right sides
3, 24, 25, 26, and the pinch roll 27,
28 is also the roll 1 in the above-described twist straightening unit 1, respectively.
Similar to 1, 12, etc., the upper and lower rolls are configured so as to cope with the passage of the two reinforcing bars A.

Further, the rolls 21 and 2 forming a pair of the left and right sides.
The rotation axes of 2, 23, 24, 25, 26 and the rotation axes of the pinch rolls 27, 28 are all opposite to the first reference plane 17 at the uppermost portion of the lateral bending correction unit 2. The second reference surface 29 (FIG.
(Refer to)).

The horizontal straightening roll group R1 is composed of the rolls 21, 22, 23, 24, 25, 26, 27, 2 described above.
It is composed of all eight combinations.

The details of the vertical bending correction portion 3 are configured as shown in FIG. That is, the vertical bending correction portion 3
In order to correct the vertical bending of the two reinforcing bars A whose lateral bending has been corrected by the lateral bending correcting section 2 in parallel in parallel in a stepwise manner, Upper and lower rolls 31 and 3 which allow the intermediate passage
2, 33, 34, 35, and 36 are provided in multiple stages (in this embodiment, in three stages) in the traveling direction of the reinforcing bar A. Incidentally, these rolls 31, 32, 33, 34, 35,
The rolls 31, 35, and 36 out of 36 are composed of a combination of two rolls in this embodiment. In addition, with respect to the rolls 31, 32, 33, 34, 35, 36 forming the pair of the upper and lower sides,
A pair of upper and lower pinch rolls 3 is provided on the downstream side in the traveling direction.
7, 38 are provided. These pinch rolls 37,
The vertical position adjustment of 38 is performed based on the operation of the manual operation parts 37A and 38A respectively linked thereto. Also,
The upper and lower rolls 31, 32, 33, 34, 3
The lower rolls 32, 34, and 36 of the rolls 5, 36 are fixed rolls. On the other hand, the remaining upper rolls 31, 33,
35 are individually linked to the rods of the adjusting cylinders 31A, 33A, and 35A.
By the individual drive control of A, 33A, and 35A, the installation position of the reinforcing bar A with respect to the passing position is individually changed.

Rolls 31, 32, 3 forming the pair of upper and lower sides
3, 34, 35, 36, and the pinch roll 37,
38 is also the roll 1 in the above-described twist straightening unit 1, respectively.
Similar to 1, 12, etc., the upper and lower rolls are configured so as to cope with the passage of the two reinforcing bars A.

Further, the rolls 31 and 3 forming the pair of upper and lower sides.
The rotation axes of 2, 33, 34, 35, 36 and the rotation axes of the pinch rolls 37, 38 are all in the direction orthogonal to the second reference plane 29 on the front surface of the vertical bending correction portion 3. It stands upright on the formed third reference surface 39 (see FIG. 2).

The vertical straightening roll group R2 includes the rolls 31, 32, 33, 34, 35, 36, 37, 3 described above.
It is composed of all eight combinations.

The details of the bending cutting section 4 are constructed as shown in FIG. That is, the bending cutting portion 4 is configured such that the bending of the reinforcing bar A whose bending is corrected by the bending correcting portions 2 and 3 can be performed in parallel with the rectangular frame shape and the terminal cutting after the bending can be performed in parallel. It is a thing.

The mechanism for bending the rebar A into a rectangular frame is constructed as follows. That is, as shown in FIG. 8, the bending cutting section 4 allows the reinforcing bar A whose bending has been corrected by the bending correcting sections 2 and 3 to pass, and
A tubular body 41 fixed on the base of the bending section 4;
A fulcrum member 42 having a substantially heart shape in a front view, which is continuously provided downstream of the tubular body 41 in the advancing direction of the reinforcing bar and fixed on the base of the bending cutting portion 4, and the bending cutting portion 4
Turntable 43 rotatably attached to the base of
And a force point member 45 which is normally provided in a recessed portion 44 formed in a part of the turntable 43 in a housed state, and which is configured to project forward from the recessed portion 44 as necessary.
And are provided as main members. When bending the reinforcing bar A in the bending cutting section 4 having such a configuration, first,
After feeding the reinforcing bar A into the bending cutting section 4 as shown in FIG. 8 (a), rotating the turntable 43 as shown by the arrow in FIG. 8 (b) while projecting the force application member 45. Thus, the reinforcing bar A is bent at one fulcrum of the fulcrum member 42 (the lower fulcrum in FIG. 8B). Needless to say, when it is desired to bend the reinforcing bar A in the opposite direction, the other fulcrum of the fulcrum member 42 is used. Needless to say, if the force application member 45 interferes with the movement of the bending position of the reinforcing bar A, the force application member 45 is stored in the recess 44.

After bending the rebar A into a rectangular frame shape,
The disconnecting mechanism for disconnecting the terminal is configured as follows. That is, the cutting mechanism is formed by providing the fulcrum member 42 having a substantially heart shape in a front view in the bending and cutting section 4 with the shear blade 46 which is capable of retracting in the front-rear direction at a substantially central portion thereof. . When the end of the reinforcing bar A is cut by the bending cutting section 4 having such a configuration, first, the end of the reinforcing bar A bent into a rectangular frame is aligned, and then the fulcrum member 42 is aligned. The shearing blade 46 is projected forward to generate a shearing force between the shearing blade 46 and the fulcrum member 42, and the shearing force cuts the terminal.

Next, another embodiment will be described. In the above-described embodiment, in order to improve the efficiency of the work of molding a large number of reinforcing bars A having a desired shape, two pedestals 5 are prepared, and the two pedestals 5 are individually rewound to form a substantially linear shape. Two long rebars A were fed into the device of the present invention in parallel vertically, but only one long rebar rewound from one stand in a substantially straight line is provided in the device. Another embodiment is conceivable in which the desired rebar bending is carried out by feeding the sheet to the. In this another embodiment, of the upper and lower divided rolls in the above-described embodiment, the reinforcing bar may be bent using only one of the upper side and the lower side, and the bending of one reinforcing bar is always performed. When this is done, the structure of each roll group does not have to be a double upper and lower structure as in the above-described embodiment.

Further, in the above-described embodiment, the twist correction section 1
The pair of left and right rolls 11 and 12 in FIG.
The outer diameters of the rolls 1 and 12 are linearly gradually reduced toward the middle abdomen, but the pair of left and right rolls 11 and 12 in the twist straightening unit 1 of the device of the present invention are each roll. The outer diameters of 11 and 12 may be formed in a mortar shape in which the outer diameter is gradually reduced toward the middle abdomen (see FIGS. 10 and 11 showing the conventional device).

The final shape of the reinforcing bar A that is straightened, bent, and cut by the apparatus of the present invention as described above is not limited to the rectangular frame shape in the above-mentioned embodiment, and various shapes can be considered. Nor.

It should be noted that although reference numerals are given in the claims for convenience of comparison with the drawings, the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a perspective view showing the entire device of the present invention.

[Figure 2] Side view

FIG. 3 is a side view showing a main portion of a twist correction portion of the device of the present invention.

[Figure 4] Front view

FIG. 5 is a front view showing the twist correction portion (a front view from an obliquely upper side).

FIG. 6 is a plan view showing a lateral bending correction portion of the device of the present invention (plan view from obliquely above).

FIG. 7 is a front view showing a vertical bending correction portion of the device of the present invention (a front view from an oblique upper side).

FIG. 8 is an explanatory view showing a bending operation of a bending cutting portion of the device of the present invention.

FIG. 9 is a perspective view showing good and defective reinforcing bars after bending cutting.

FIG. 10 is a side view showing the main part of the twist correction section of the conventional device.

FIG. 11 is a front view thereof.

[Explanation of symbols]

 1 Twist straightening part 2,3 Bending straightening part 4 Bending cutting part 11,12 Roll 11a, 12a Rotation axis core A Reinforcing bar

Claims (1)

[Claims] 1. A long reinforcing bar (A) wound in a hoop shape is unwound to allow an intermediate passage of the reinforcing bar (A) to be substantially straight, and the intermediate passage allows the reinforcing bar (A) to pass through.
The relative positions of the rolls (11) and (12) can be changed and the rolls (11) and (12) can be twisted so as to impart a twisting force to the rebar (A) to correct the twisting of the rolls (11) and (12). Twist correction section (1) mainly composed of a pair of mortar-shaped rolls (11), (12) whose outer diameter gradually decreases toward the middle abdomen
And a bending correction portion (2), (3) for correcting the bending of the reinforcing bar (A) whose twist has been corrected by the bending correction portion (1), and the bending correction portion (2), (3) for Bending cutting part (4) capable of bending the bent reinforcing bar (A) into a desired shape and cutting the end after the bending.
A rebar bending machine comprising: a rotary shaft core (11a) of each roll (11), (12),
(12a) is set in a mutually parallel positional relationship, and
At least one of the rolls (11) and (12) is configured to be movable in parallel along the rotary shaft cores (11a) and (12a), so that each of the rolls for applying the twisting force is A reinforcing bar bending machine in which the relative positions of the rolls (11) and (12) can be freely changed.