JP5832579B2 - Twisted flat bar manufacturing apparatus and method - Google Patents

Description

The present invention relates to a twisted flat bar manufacturing apparatus and method that can be used for, for example, spiral piles.

  Spiral piles are attracting attention as foundation piles for buildings and structures. The construction method using spiral piles has many advantages over concrete foundations, such as shortening the construction period, reducing costs, eliminating the need for residual soil treatment, and enabling reuse. Such a spiral pile is made using a twisted flat bar obtained by twisting a strip-shaped flat bar.

  As a method for producing the twisted flat bar, those shown in the following Patent Document 1 and Patent Document 2 are disclosed. In the following description, the reference numerals in parentheses are those published in the publication.

Patent Document 1 has the following description.
[Paragraph 0010]
The machine can then twist flat bars to make twisted flat bars. When manufacturing a twisted flat bar, as shown in FIG. 6, the guide roller of the moving part is removed, and a flat bar fixing bracket A (14) is attached instead. Instead of the square shaft at the tip of the torsion shaft (3), a flat steel fixture B (15) is attached. Then, the flat metal (16) is passed through the round pipe (13), and both ends of the flat steel are fixed to the fixing metal A and the fixing metal B, respectively. In such a state, when the torsion shaft is slowly rotated, a twisted flat bar is completed.
[Paragraph 0011] [Effect of the Invention]
As described above, the present invention makes it possible to accurately and easily twist square pipes and flat steels, which could not be achieved in the past, in a straight state. For this reason, a twisted angle pipe and a twisted flat bar can be made cheap, and there is an effect of widespread use for various decorations.

Patent Document 2 has the following description.
[Paragraph 0029]
The method for producing a twisted flat bar according to the present invention includes sandwiching two round bars arranged on both sides of the flat bar by inclining them in the same angle and different directions with respect to the longitudinal direction of the flat bar. A twisted flat bar characterized in that the steel is rotated relative to the flat bar with the longitudinal direction as a rotation axis, and the flat bar is moved relative to the round bar in the longitudinal direction. It is a manufacturing method.
The manufacturing method and manufacturing apparatus of the twisted flat bar of this invention are demonstrated in detail below.
[Paragraph 0030]
FIG. 1 is a diagram showing the positional relationship between a twisted flat bar and a round bar, in which FIG. 1 (a) is a plan view and FIG. 1 (b) is a front view.
The feature of the present invention is to twist the flat bar by using two round bars arranged in different directions at the same angle with respect to the longitudinal direction of the flat bar. This serves as a guide for the flat bar to which the round bar is twisted, the pitch angle of the twisted flat bar is arranged in the direction along the central axis of the round bar, and the pitch corresponds to the radius of curvature of the round bar. Since the interval is set, it is possible to twist at a stable pitch. FIG. 1 shows the positional relationship between a twisted flat bar and a round bar. As shown in FIG. 1, the twisted flat bar (6) is twisted at, for example, two rounds that intersect at 90 degrees. Can be pinched with steel (7). Note that the pitch angle and interval can be easily adjusted by changing the angle and diameter of the round steel bar.

Japanese Patent No. 3023583 Japanese Patent No. 5437810

[Problems of Reference 1]
The technique of the said patent document 1 is passing the flat bar before twisting through a round pipe, and twisting the both ends of a flat bar in that state.
In such a technique of Patent Document 1, it is necessary to prepare a round pipe in order to perform twisting. Also, as a preparatory work, a flat steel is passed through the round pipe, and the twisted flat steel that has been processed must be removed from the round pipe. Thus, it is necessary to work through and pull out the round pipe, and the longer the target twisted flat bar becomes, the more difficult it becomes. Moreover, if the length dimension of the torsion flat bar to process differs, the length of the round pipe to prepare will also differ. For this reason, purchase costs and storage costs for round pipes are added to the manufacturing costs.

[Problems of Reference 2]
In the technique of Patent Document 2, a flat bar is sandwiched between two round bars arranged in an X shape, these two round bars are rotated relative to the flat bar, and the flat bar is moved in the longitudinal direction with respect to the round bar. It is to move relative to.
In such a technique of Patent Document 2, it is necessary to prepare two round steel bars in order to perform twisting. And as a preparatory work, the 1st operation | movement which pinches | interposes a flat bar with the round bar is required. In twisting, a second operation for rotating two round bars relative to a flat bar and a third operation for moving the flat bar relative to the round bar in the longitudinal direction must be performed simultaneously. Therefore, the apparatus includes a structure for realizing a first operation of sandwiching a flat bar with round bar, a structure for realizing a second operation of rotating the two round bars relative to the flat bar, and the round A structure for realizing the third operation of moving the flat bar relative to the steel in the longitudinal direction is required. That is, the structure of the device itself is complicated and the control is also complicated. Of course, the cost related to these devices and controls is added to the manufacturing cost.

〔the purpose〕
The present invention solves the above-mentioned problems, and the object thereof is as follows.
An apparatus and method for producing a torsion flat bar capable of producing a torsion flat bar with simple equipment efficiently and at low cost.

The twisted flat bar manufacturing apparatus according to claim 1 has the following configuration in order to achieve the above object.
First gripping means for gripping the first end of the strip-shaped flat steel;
Second gripping means for gripping the second end of the flat steel;
Rotational drive means for rotationally driving the first gripping means to twist the flat steel;
When the first gripping means is driven to rotate, a tension is applied to apply tension to the flat steel that is twisted by urging the second gripping means away from the first gripping means. and means,
The tension applying means is
Left and right guide rails for sliding the second gripping means back and forth in the longitudinal direction of the gripped flat steel;
A tow rod that pulls the second gripping means in a direction away from the first gripping means;
A connecting member projecting left and right at the end of the tow rod;
And a pair of pressing means for applying a pressing force to the left and right portions of the connecting member .

The twisted flat bar manufacturing apparatus of claim 2 employs the following configuration in addition to the configuration of claim 1. The first gripping means and the second gripping means include a pair of gripping blocks for gripping flat steel, and a holder for accommodating both gripping blocks,
Both gripping blocks and holders are provided with cam surfaces for biasing both gripping blocks in a direction that increases the gripping force against the flat bar when a tensile force is applied to both gripping blocks that grip the flat bar. Yes.

The manufacturing method of the twisted flat bar of Claim 3 takes the following structure, in order to achieve the said objective.
Grip the first end of the strip-shaped flat steel with the first gripping means,
Grip the second end of the flat steel with the second gripping means,
In order to give a twist to the flat steel, the first gripping means is rotationally driven by a rotational driving means,
When rotating the first gripping means, the second gripping means is urged in a direction away from the first gripping means to give a twist to the flat steel which is torsioned by the tension applying means. in providing,
The tension applying means is
With the left and right guide rails, slide the second gripping means back and forth in the longitudinal direction of the gripped flat steel,
Pulling the second gripping means in a direction away from the first gripping means by a pulling rod;
A pressing force is applied to the left and right portions of the connecting member projecting left and right at the end of the pulling rod .

In the twisted flat bar manufacturing apparatus according to claim 1,
The first end of the strip-shaped flat steel is gripped by the first gripping means, and the second end of the flat steel is gripped by the second gripping means. The first gripping means is rotationally driven by the rotational drive means, and the flat steel having the first end and the second end gripped by the first gripping means and the second gripping means is twisted. give. When the first gripping means is rotationally driven, the second gripping means is urged in a direction away from the first gripping means, and tension is applied to the flat steel to which torsion is applied. As a result, the torsion processing can be performed uniformly over the entire length.
Therefore, the present invention does not need to prepare a round pipe as in Patent Document 1, and does not require a preparatory work for passing a flat steel through the round pipe. Of course, it is not necessary to remove the twisted flat bar from the round pipe after processing. Thus, there is no need to pass through or pull out the round pipe. The purchase cost and storage cost of the round pipe can be reduced.
Moreover, unlike the patent document 2, this invention does not need to prepare two round steel bars. The structure for realizing the first operation of sandwiching the flat steel with the round bar and the structure for realizing the second operation of rotating the two round steels relative to the flat steel are both for the round steel. There is also no need for a structure for realizing the third operation of relatively moving the flat steel in the longitudinal direction.
The tension applying means includes left and right guide rails that slide the second gripping means back and forth in the longitudinal direction of the gripped flat steel, and a traction that pulls the second gripping means in a direction away from the first gripping means. A rod, a connecting member projecting left and right at the end of the pulling rod, and a pair of pressing means for applying a pressing force to the left and right portions of the connecting member. Therefore , the present invention can produce a twisted flat bar efficiently and at low cost with simple equipment.

The twisted flat bar manufacturing apparatus according to claim 2 comprises:
The first gripping means and the second gripping means grip flat steel with a pair of gripping blocks accommodated in a holder. The both gripping blocks and the holder are provided with cam surfaces. When a tensile force is applied to both gripping blocks that grip the flat bar, both gripping blocks are urged in a direction that increases the gripping force on the flat bar.
Therefore, when the first gripping means is rotationally driven, the second gripping means is biased in a direction away from the first gripping means, and tension is applied to the flat steel to which torsion is applied. The gripping force increases as tension is applied. For this reason, an accident in which the flat bar is detached from the first gripping means or the second gripping means during processing is prevented, and the safety is improved.

The method for producing a twisted flat bar according to claim 3 comprises:
The first end of the strip-shaped flat steel is gripped by the first gripping means, and the second end of the flat steel is gripped by the second gripping means. The first gripping means is rotationally driven by the rotational drive means, and the flat steel having the first end and the second end gripped by the first gripping means and the second gripping means is twisted. give. When the first gripping means is rotationally driven, the second gripping means is urged in a direction away from the first gripping means, and tension is applied to the flat steel to which torsion is applied. As a result, the torsion processing can be performed uniformly over the entire length.
Therefore, the present invention does not need to prepare a round pipe as in Patent Document 1, and does not require a preparatory work for passing a flat steel through the round pipe. Of course, it is not necessary to remove the twisted flat bar from the round pipe after processing. Thus, there is no need to pass through or pull out the round pipe. The purchase cost and storage cost of the round pipe can be reduced.
Moreover, unlike the patent document 2, this invention does not need to prepare two round steel bars. The structure for realizing the first operation of sandwiching the flat steel with the round bar and the structure for realizing the second operation of rotating the two round steels relative to the flat steel are both for the round steel. There is also no need for a structure for realizing the third operation of relatively moving the flat steel in the longitudinal direction.
Further, the tension applying means slides the second gripping means back and forth in the longitudinal direction of the gripped flat steel by the left and right guide rails, and the second gripping means in the direction away from the first gripping means by the pulling rod. The means is pulled, and a pressing force is applied to the left and right portions of the connecting member projecting left and right at the end of the pulling rod by the pressing means. Therefore , the present invention can produce a twisted flat bar efficiently and at low cost with simple equipment.

It is a figure which shows the manufacturing apparatus of the twisted flat bar of one Embodiment of this invention. It is sectional drawing explaining a 1st holding means and a 2nd holding means.

  Next, an embodiment for carrying out the present invention will be described.

[Overall structure]
FIG. 1 is a diagram showing an embodiment of a twisted flat bar manufacturing apparatus according to the present invention. (A) is a plan view and (B) is a front view.

The apparatus includes first gripping means 21 for gripping the first end portion 11 of the strip-shaped flat steel 10 and second gripping means 22 for gripping the second end portion 12 of the flat steel 10. ing.
Further, when the first gripping means 21 is rotationally driven in order to give a twist to the flat steel 10, and when the first gripping means 21 is rotationally driven, the second Tension applying means 14 for applying tension to the flat steel 10 that is biased by urging the gripping means 22 away from the first gripping means 21.

[Gripping means]
FIG. 2 is a sectional view for explaining the first gripping means 21 and the second gripping means 22. (A) is the release state of the first gripping means 21, and (B) is the gripping state of the first gripping means 21. (C) is the released state of the second gripping means 22, and (D) is the gripped state of the second gripping means 22.
The first gripping means 21 shown in (A) and (B) and the second gripping means 22 shown in (C) and (D) are interchanged, but basically have the same structure.
The following description will describe the first gripping means 21 as a representative.

The first gripping means 21 includes a pair of gripping blocks 23 for gripping the flat steel 10 and a holder 24 that houses the gripping blocks 23.
The gripping block 23 and the holder 24 are configured to bias the gripping blocks 23 in a direction in which the gripping force on the flat steel 10 is increased when a tensile force is applied to the gripping blocks 23 that grip the flat steel 10. First and second cam surfaces 25A and 25B are provided.

  In the pair of gripping blocks 23, facing each other is a gripping surface 26 for gripping the flat steel 10. The pair of gripping blocks 23 are formed on the first cam surface 25 </ b> A having a surface that is opposite to the gripping surface 26 and is tapered so that the gripping surface 26 is combined. On the other hand, the holder 24 is formed with an accommodation space 28 in which the pair of grasping blocks 23 are accommodated with the grasping surfaces 26 aligned. The accommodation space 28 is formed with a second cam surface 25B that is in sliding contact with the first cam surfaces 25A on both sides in a state where the pair of gripping blocks 23 are accommodated. The second cam surface 25B is provided with an inclination such that the inner sides facing each other become narrower toward the front.

  An opening / closing mechanism 27 for opening and closing the pair of gripping blocks 23 is provided at the base portion of the pair of gripping blocks 23. The opening / closing mechanism 27 includes a cylinder 29 that moves the pair of gripping blocks 23 forward and backward within the accommodation space 28 of the holder 24. A slide member 31 that fits into a slide groove 30 formed in the pair of gripping blocks 23 is attached to the tip of the cylinder 29.

  When the pair of gripping blocks 23 are moved back and forth by the operation of the cylinder 29, the first cam surface 25A on the gripping block 23 side comes into sliding contact with the second cam surface 25B on the holder 24 side. At this time, the first cam surface 25 </ b> A provided with the tapered inclination moves forward along the second cam surface 25 </ b> B that becomes narrower toward the front. At this time, the pair of gripping blocks 23 move in a direction in which the gripping surfaces 26 are aligned.

  In this way, the pair of gripping blocks 23 open and close. When the tensile force is applied in the direction of pulling out the flat steel 10 gripped by the pair of gripping blocks 23 by the action of the first cam surface 25A and the second cam surface 25B, the pair of gripping blocks 23 are gripped. It is energized in the direction of increasing power.

[Rotation drive means]
Returning to FIG. 1, the description will be continued.
The first gripping means 21 is connected to the rotation driving means 13 by the rotation shaft 15. Specifically, the rotation driving means 13 can be a motor. The rotation driving means 13 rotates the first gripping means 21 gripping the first end portion 11 of the flat steel 10 around the longitudinal direction of the gripped flat steel 10 as an axis.

[Tensioning means]
The tension applying means 14 includes left and right guide rails 16 for sliding the second gripping means 22 back and forth in the longitudinal direction of the gripped flat steel 10. The tension applying means 14 further includes a traction rod 17 that protrudes behind the second gripping means 22 guided by the guide rail 16 (in a direction away from the first gripping means 21). The tension applying means 14 further includes a connecting member 18 projecting left and right at the rear end portion of the pulling rod 17. Further, the tension applying means 14 further applies a pressing force to the left and right portions of the connecting member 18 toward the rear to pull the second gripping means 22 backward via the tow rod 17. A pressing means 19 is provided. For example, a hydraulic cylinder can be used as the pressing means 19.

[Example of operation]
First, the first end portion 11 of the strip-shaped flat steel 10 is gripped by the first gripping means 21. On the other hand, the second end 12 of the flat steel 10 is gripped by the second gripping means 22. Next, the rotation driving means 13 is driven, and the first gripping means 21 is rotated about the longitudinal direction of the gripped flat steel 10 as an axis. At the same time, the second gripping means 22 is biased by the tension applying means 14 in a direction away from the first gripping means 21. While the first gripping means 21 is rotated, the tension is applied to the flat bar to which the torsion is applied while the flat bar 10 is being twisted. As a result, the torsion processing can be performed uniformly over the entire length. Such twisting by rotation and tension application is continued until both sides of the flat steel 10 that exhibits a spiral shape by twisting are approximately 45 ° with respect to the longitudinal direction.

[Function and effect]
As described above, the following embodiment provides the following operational effects.

In this embodiment, unlike Patent Document 1, it is not necessary to prepare a round pipe, and it is not necessary to prepare for passing the flat steel 10 through the round pipe. Of course, it is not necessary to remove the twisted flat bar from the round pipe after processing. Thus, there is no need to pass through or pull out the round pipe. The purchase cost and storage cost of the round pipe can be reduced.
Moreover, unlike this patent document 2, this embodiment does not need to prepare two round steel bars. The structure for realizing the first operation of sandwiching the flat steel with the round bar and the structure for realizing the second operation of rotating the two round steels relative to the flat steel are both for the round steel. There is also no need for a structure for realizing the third operation of relatively moving the flat steel in the longitudinal direction.
Thus, this embodiment can produce a twisted flat bar efficiently and at low cost with simple equipment.

In the present embodiment , the first gripping means 21 is driven to rotate, and the second gripping means 22 is biased in a direction away from the first gripping means 21, so that the torsional steel 10 is twisted. When applying tension, the gripping force increases as tension is applied. For this reason, an accident that the flat steel 10 is detached from the first gripping means 21 or the second gripping means 22 during processing is prevented, and the safety is improved.

[Modification]
The above has described a particularly preferred embodiment of the present invention. However, the present invention is not intended to be limited to the illustrated embodiment, and can be implemented by being modified in various aspects, and the present invention includes various modifications. This is the purpose.

10: flat steel 11: first end 12: second end 13: rotation driving means 14: tension applying means 15: rotating shaft 16: guide rail 17: traction rod 18: connecting member 19: pressing means 21: First gripping means 22: second gripping means 23: gripping block 24: holder 25A: first cam surface 25B: second cam surface 26: gripping surface 27: opening / closing mechanism 28: accommodating space 29: cylinder 30: Slide groove 31: slide member

Claims (3)

First gripping means for gripping the first end of the strip-shaped flat steel;
Second gripping means for gripping the second end of the flat steel;
Rotational drive means for rotationally driving the first gripping means to twist the flat steel;
When the first gripping means is driven to rotate, a tension is applied to apply tension to the flat steel that is twisted by urging the second gripping means away from the first gripping means. and means,
The tension applying means is
Left and right guide rails for sliding the second gripping means back and forth in the longitudinal direction of the gripped flat steel;
A tow rod that pulls the second gripping means in a direction away from the first gripping means;
A connecting member projecting left and right at the end of the tow rod;
A twisted flat bar manufacturing apparatus comprising a pair of pressing means for applying a pressing force to the left and right portions of the connecting member . The first gripping means and the second gripping means include a pair of gripping blocks for gripping flat steel, and a holder for accommodating both gripping blocks,
Both gripping blocks and holders are provided with cam surfaces for biasing both gripping blocks in a direction that increases the gripping force against the flat bar when a tensile force is applied to both gripping blocks that grip the flat bar. The twisted flat bar manufacturing apparatus according to claim 1. Grip the first end of the strip-shaped flat steel with the first gripping means,
Grip the second end of the flat steel with the second gripping means,
In order to give a twist to the flat steel, the first gripping means is rotationally driven by a rotational driving means,
When rotating the first gripping means, the second gripping means is urged in a direction away from the first gripping means to give a twist to the flat steel which is torsioned by the tension applying means. in providing,
The tension applying means is
With the left and right guide rails, slide the second gripping means back and forth in the longitudinal direction of the gripped flat steel,
Pulling the second gripping means in a direction away from the first gripping means by a pulling rod;
A method for producing a twisted flat bar, wherein a pressing force is applied to left and right portions of a connecting member projecting left and right at an end of the pulling rod .

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