JP2824409B2 - Rebar cutting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a cutting method for a rebar in which a fixed blade and a movable blade which can be moved close to the fixed blade are displaced in the longitudinal direction of a reinforcing bar disposed between the two blades. Related to the device.

[0002]

2. Description of the Related Art Conventionally, as this type of rebar cutting device,
FIG. 12 shows a configuration of the fixed blade / movable blade edge portion 24.
As shown in FIG. 5, a flat contacting blade edge portion 25 which comes into contact with the peripheral portion of the rebar 1 to be cut and exerts a cutting force by a cutting operation for bringing the both blades 22 and 23 relatively close to each other is formed. 23 were provided over the entire thickness of each.

[0003]

With respect to the cutting of a reinforcing bar, it is preferable that the cut surface does not have a large inclination and that the cross-sectional deformation of the cut reinforcing bar is small. That is, the fact that the cut surface does not incline greatly means that, for example, when joining the cut rebars by end face pressure welding, it is difficult to form a large gap between the butted end faces. This is an important item in the sense that pressure welding work can be performed. In addition, the fact that the cross-sectional deformation of the cut rebar is small is, for example, when the rebar is a threaded rebar and a pair of threaded rebars are joined by a threaded rebar jointing coupler having an internal thread formed on the inner periphery, the This is an important matter in that the screwing of the coupler with respect to is smoothly performed.

In order to satisfy the above requirements, it is conceivable that the width of the cutting blade is made thinner and sharper. However, as long as the object to be cut is a rebar, there is a danger of blade spilling and blade deformation. Therefore, according to the conventional rebar cutting device, the thickness of the contact blade tip must be set to be large and equal to the total thickness of the blade. However, according to the conventional rebar cutting device in which the thickness dimension of the contact blade tip is set to be large, as shown in FIG.
The entire thickness of the contact blade tip acts on the rebar while contacting the rebar, but the greater the thickness, the more the point of action of the force moves farther away from the cut surface, and the greater the pressing bending force acts on the rebar. It will be easier. As a result, there is a problem that the cut surface of the cut rebar is greatly inclined or the cross section is largely deformed.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a rebar cutting apparatus which can solve the above-mentioned problems and can reduce the cross-sectional deformation at the cut portion of the target rebar and the inclination of the cut surface.

[0006]

[Means for Solving the Problems]

[Structure] The characteristic structure of the present invention according to claim 1 is that, in forming the cutting edge portion of the fixed blade / movable blade, the cutting operation of bringing the both blades relatively close to each other makes contact with the peripheral portion of the reinforcing bar to be cut. A contact blade tip for applying a cutting force is provided at an inner end in the thickness direction of the two blades, and a retired blade tip retreated toward the base end of each of the two blades from the contact blade tip is connected to the contact blade. The cutting edge portion is provided continuously on the outer side in the thickness direction of the two cutting edges.

A feature of the present invention according to claim 2 is that a step portion is provided at a boundary between the contact blade tip and the retired blade tip.

[0008] A characteristic feature of the present invention according to claim 3 is that the cutting edge portion is formed in a curved shape along the outer peripheral surface of the rebar.

According to the first aspect of the present invention, while the blade itself can be set to a large thickness to increase the strength, the blade comes into contact with the rebar and exerts a cutting force. It is possible to reduce the thickness of the contact blade tip portion to be made. That is, while ensuring the strength of the cutting edge, the thickness of the contacting cutting edge portion can be reduced, so that the point of action of the cutting force can be made closer to the cutting surface side, and the force acting on the rebar acting during cutting can be reduced. It is possible to reduce the pressing bending force and effectively apply the shearing force. Therefore, it is possible to reduce the cross-sectional deformation of the reinforcing bar and the inclination of the cut surface.For example, when the target reinforcing bar is a screw reinforcing bar, the joining coupler can be smoothly screwed and joined, and In the case where the cut rebars are pressure-welded to each other, it is possible to carry out the joining work efficiently without performing an extra end face processing work, and as a result,
It is possible to accurately cut the reinforcing bars so as to improve the efficiency of assembling and joining the cut reinforcing bars.

According to the characteristic configuration of the present invention according to claim 2, the provision of the step makes it easier to further prevent the retired cutting edge from directly contacting the rebar, and the contacting cutting edge is further improved. The cutting force applied only from the portion can efficiently act on the reinforcing bar. Then, it is possible to achieve more accurate rebar cutting.

According to the third aspect of the present invention, since the cutting edge can be cut while abutting along the circumferential direction of the reinforcing bar, the cross-sectional deformation of the reinforcing bar is further suppressed. can do.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a rebar cutting facility A in which a long screw rebar (an example of rebar, hereinafter simply referred to as a rebar) 1 is cut into a plurality of rebars 1a of a predetermined length and can be collected. The rebar cutting equipment A is a rebar cutting device for cutting the rebar 1 (an example of a rebar cutting device of the present invention.
B), a plurality of the long rebars 1 are accommodated, and a supply device C that can be supplied to the cutting device B by a predetermined number is supplied to the cutting device B by the supply device C. In addition to supporting the reinforcing bar 1, a storage device D that stores the reinforcing bar 1 a cut by the cutting device B is provided in series. As shown in FIG. 8, the rebar 1 has a male screw portion 1b formed on the outer peripheral portion, and a female screw is formed on the inner peripheral portion over the butted end portions of the pair of rebars 1. The coupler T can be externally fitted and connected.

As shown in FIG. 3, the supply device C feeds the first roller conveyor 2 which can be sent to the cutting device B with the rebar 1 mounted thereon and is drivable, by the respective devices B, C and D.
A plurality of the rebars 1 can be placed along the both sides of the first roller conveyor 2 and the rebars 1 can be placed freely. A mounting portion 3 capable of supplying a predetermined number of rollers to the first roller conveyor 2 from the side is separately provided on both sides of the first roller conveyor 2. The supply of the rebar 1 to the first roller conveyor 2 by the placing section 3 is performed by a chain conveyor 3 a provided in the placing section 3. The chain conveyor 3a is formed so as to be movable along the width direction of the first roller conveyor 2 with the rebar 1 placed thereon.

As shown in FIGS. 1, 2, and 4, the storage device D is capable of being pulled and driven by a predetermined length from the distal end of the rebar 1 sent from the first roller conveyor 2 to the cutting device B. The second roller conveyor 4 is connected to each of the devices B,
A plurality of reinforcing bars 1a of a predetermined length cut by the cutting device B are provided along the both side portions of the second roller conveyor 4 so as to be oriented in the longitudinal direction (drawing direction) in the direction in which C and D are connected. Flexible accommodation sections 5 are separately provided on both sides of the second roller conveyor 4. In addition, for the rebar take-up of a predetermined length, the second roller conveyor 4
A stopper S is provided at the end portion of the rebar transport path, and the transported rebar 1 abuts against the stopper S to prevent the rebar 1 from moving, so that only a predetermined length can be taken. Become.

As shown in FIG. 4, the second roller conveyor 4 is connected to the cutting device B.
A swinging mechanism 6 that can be driven up and down with the end opposite to the side as a fulcrum, and a slide that can be driven close to and away from the cutting device B with the second roller conveyor 4 along the longitudinal direction thereof. A drive mechanism 7 and a transfer mechanism 8 capable of individually transferring the reinforcing bar 1a placed on the second roller conveyor 4 to the two storage sections 5 are provided. The swing mechanism 6
Is formed so as to swing downward in advance when the reinforcing bar 1 is cut, and is configured so that the reinforcing bar 1 does not easily jump up due to the reinforcing bar cutting force. Further, the slide drive mechanism 7 can be used for changing the setting of the length of the reinforcing bar to be cut. The transfer mechanism 8 is provided with a pair of push-up members 9 each having a tapered surface 9a inclined on both sides of the conveyor, and the push-up members 9 are projected from below the second roller conveyor 4 toward the transfer surface. Thereby, the reinforcing bar 1a placed on the tapered surface 9a can be rolled in the inclined direction, and the accommodation portion 5 arranged downstream in the inclined direction can be used.
Can be transferred to

The accommodation section 5 is constituted by a plurality of angle members 10 which are separately provided on both sides of the second roller conveyor 4 so as to be inclined. 1a is configured to be supported and received by the angle member 10 and housed in a predetermined portion.

As shown in FIG. 5, the cutting device B is provided with a lower blade (an example of a fixed blade) 12 fixed to an apparatus main body 11, and an upper blade (an example of a fixed blade) that can be driven to approach and separate from the lower blade 12. An example of the movable blade 13 is provided so as to be displaced toward the accommodation device D in the longitudinal direction of the reinforcing bar 1 disposed between the two blades 12, 13, and at a position closer to the supply device C than the lower blade 12. A pair of presser support portions 14 for supporting the rebar 1 so as to be movable along the movable direction (up and down direction) of the upper blade 13 and separately marking front and rear positions at a predetermined distance from the cutting position of the rebar 1. Is attached to the apparatus main body 11. When a pair of butt rebars 1 are inserted into the connecting coupler T and joined, it is possible to know the respective penetration lengths by the marks attached to the ends of the rebars 1 by the marking device 15. .

Each of the two blades 12 and 13 is formed in an elongated shape extending over the plurality of reinforcing bars 1 so that the plurality of reinforcing bars 1 arranged in parallel at intervals can be cut at once (see FIG. 7). ). The upper blade 13 is attached to the vertical drive unit 11a of the apparatus main body 11, and the upper blade 13 is moved closer to the lower blade 12 by driving the vertical drive unit 11a to the lower side. Can be cut by applying a shearing force to the reinforcing bar 1 disposed at the bottom. The upper blade 13, as shown in FIG.
The three blade tips 12a and 13a are arranged so as to be inclined so as to have an angle along the radial direction of the rebar 1, and one of the plurality of rebars 1 is provided with a cutting operation for lowering the upper blade 13. It is configured so that the cutting force acts in turn one by one,
The configuration is such that the peak cutting driving force can be suppressed as compared with applying the cutting force at one time.

For each of the upper and lower blades 13 and 12,
More specifically, as shown in FIG. 6, the respective cutting edges 12a, 13a are brought into contact with the peripheral portion of the rebar 1 by a cutting operation for bringing the two blades 13, 12 relatively close to each other to exert a cutting force. The contact blade tip 16 is connected to the two blades 13,
12 provided at the inner end in the thickness direction of the
6, the reciprocating blade tip 17 retreated to the base end side of each of the two blades 13 and 12 is attached to the two blades 1 of the contact blade tip 16.
It is configured so as to be continuously provided on the outside in the thickness direction of 3,12.
A step is formed at the boundary between the contact blade tip 16 and the retired blade tip 17, and this step is formed as a step 18
Becomes As shown in FIG. 7, the cutting edge portions 12a and 13a are formed in a curved shape along the outer peripheral surface of the reinforcing bar 1, and a plurality of cutting edge portions 12a and 13a are provided on both cutting edges.
Are separately provided at intervals along the blade edge length direction.

The holding support portion 14 is provided with the two blades 12 and 1.
It is attached to the apparatus main body 11 so as to be located above the reinforcing bar 1 disposed between the three, and is lowered by hydraulic driving together with the upper blade 13 at the time of cutting to prevent the base end side of the reinforcing bar 1 from floating. Can be supported.

According to the rebar cutting equipment A of the present embodiment, the long rebar 1 mounted on the mounting portion 3 of the supply device C is
The rebar 1 is transferred to the first roller conveyor 2 by the chain conveyor 3a, and the rebar 1 is sent out to the cutting device B and the storage device D by the first roller conveyor 2, and the tip of the rebar 1 contacts the stopper S of the second roller conveyor 4. Thereafter, the swinging mechanism 6 swings the second roller conveyor 4 downward, and then only moves the upper blade 13 and the presser supporter 14 downward. As shown in FIG. It is possible to perform cutting without being raised and elastically supported by the pressing support portion 14. Then, the rebar 1 can be cut sharply and with less cross-sectional deformation by the small-width contact blade edge portion 16, and the stress of the blade edge accompanying the cutting is received by the entire wide blade through the retired blade edge portion 17. be able to.

[Another Embodiment] Another embodiment will be described below.

<1> The arrangement of the two blades is not limited to the lower blade being a fixed blade and the upper blade being a movable blade, as described in the previous embodiment. The upper blade may be a fixed blade. Furthermore, the present invention is not limited to those arranged vertically, and may be arranged, for example, so that the rebar 1 can be cut by driving the movable blade close to the fixed blade in the lateral direction. These are collectively referred to as a fixed blade and a movable blade, respectively. <2> Further, the present invention is not limited to the configuration in which a plurality of blade tips are provided at the tip of the blade. For example, the blade may be provided with one blade tip for both blades. <3> Further, as shown in FIG. 9, the shape of the cutting edge portion may be configured to be an angular curved shape or a linear shape (not shown). <4> Further, the present invention is not limited to the configuration in which the step portion 18 is formed at the boundary between the contact blade tip portion 16 and the retired blade tip portion 17.
As shown in FIG. 10, the retired blade tip 17 may be a retired blade tip having a shape that gradually retreats from an edge of the contact blade tip 16.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a side view showing a reinforcing bar cutting equipment.

FIG. 2 is a top view showing the rebar cutting equipment.

FIG. 3 is a cross-sectional view of the rebar feeding direction showing the supply device.

FIG. 4 is a side view showing the storage device.

FIG. 5 is a front view showing a cutting device.

FIG. 6 is a front sectional view showing a main part of the cutting apparatus.

FIG. 7 is a side sectional view showing a main part of the cutting device.

FIG. 8 is an explanatory diagram showing a connection state of a screw reinforcing bar.

FIG. 9 is a side view showing a blade according to another embodiment.

FIG. 10 is a sectional front view showing a blade according to another embodiment.

FIG. 11 is a front view showing a cutting state of a reinforcing bar.

FIG. 12 is a conceptual diagram showing a conventional reinforcing bar cutting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rebar 12 Fixed blade 12a Blade tip 13 Movable blade 13a Blade tip 16 Contact blade tip 17 Retired blade tip 18 Stepped portion

Claims (3)

(57) [Claims] A fixed blade (12) and said fixed blade (12)
A movable blade (13) operable in proximity to the rebar (1) disposed between the two blades (12) and (13) in a longitudinal direction of the rebar cutting device, The edge portions (12a), (13) of the two blades (12), (13)
In the configuration (a), a contact cutting edge portion (16) for applying a cutting force by contacting a peripheral portion of the rebar (1) by a cutting operation of bringing the two blades (12) and (13) relatively close to each other. Are provided at the inner ends in the thickness direction of the two blades (12) and (13), and the two blades (12) and (12) are provided by the contact blade tip (16).
(13) Retracted blade tips (1
7), the two blades (12) of the contact blade tip (16),
(13) A rebar cutting device continuously provided outside in the thickness direction. 2. The rebar cutting device according to claim 1, wherein a step (18) is provided at a boundary between the contact blade tip (16) and the retired blade tip (17). 3. The rebar cutting according to claim 1, wherein the cutting edge portions (12a) and (13a) are formed in a curved shape along the outer peripheral surface of the rebar (1). apparatus.