Reinforcing bar cutting assist device and reinforcing bar cutting system

Abstract

To accurately cut a reinforcing bar at a low cost.SOLUTION: A reinforcing bar cutting assist device includes: a reinforcing bar receiving surface portion that is disposed to face a movable blade in a reinforcing bar cutting machine having a fixed blade and the movable blade and sandwiches a reinforcing bar before cutting together with the movable blade; and a first support portion that supports the reinforcing bar receiving surface portion to be rotatable about an axis extending in a first direction intersecting an axial direction of the reinforcing bar and a moving direction of the movable blade.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The technology of the present disclosure relates to a rebar cutting assist device and a rebar cutting system. [Background technology]

[0002] Patent document 1 describes a rebar receiving device for cutting rebar, which is provided within the rebar cutting space formed by the fixed blade and movable blade of a rebar cutting machine, and which has a rebar receiving surface that receives the rebar before cutting below the movable blade together with the fixed blade, and is capable of moving up and down so as to allow the surface to descend together with the rebar to be cut as the movable blade descends.

[0003] Patent document 2 describes a rebar conveying and cutting device that has a clamp on the product receiving side of the rebar, a movable blade on the rebar supply side, and the end of the conveyor on the rebar supply side is made lowerable below the fixed receiving blade. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-149633 [Patent Document 2] Japanese Utility Model Application Publication No. 6-5733 Summary of the Invention [Problem to be solved by the invention]

[0005] The technology disclosed herein aims to cut reinforcing bars at low cost and with high accuracy. [Means for solving the problem]

[0006] One aspect of the technology of the present disclosure is as follows.

[0007] (1) a reinforcing bar receiving surface portion disposed opposite the movable blade in a reinforcing bar cutting machine having a fixed blade and a movable blade, and which clamps the reinforcing bar together with the movable blade before cutting; A rebar cutting auxiliary device comprising: a first support portion that supports the rebar receiving surface portion so that it can rotate around an axis extending in a first direction that intersects the axial direction of the rebar and the movement direction of the movable blade.

[0008] (2) The reinforcing bar cutting auxiliary device according to (1), The first support portion supports an end portion of the reinforcing bar receiving surface portion on the opposite side to the movable blade side in the axial direction.

[0009] (3) (2) The reinforcing bar cutting auxiliary device according to A rebar cutting auxiliary device comprising a second support part that supports the first support part outside the rebar cutting machine and is configured to be rotatable around a rotation axis extending in the first direction in response to the movement of the movable blade.

[0010] (4) (3) The reinforcing bar cutting auxiliary device according to The second support unit is a transport unit that transports the reinforcing bar before cutting to the reinforcing bar cutting machine, The conveying section is configured to be able to rotate around an upstream end of the reinforcing bar in the conveying direction as a fulcrum, The first support section is a rebar cutting auxiliary device supported at a downstream end of the conveying section in the conveying direction.

[0011] (5) (4) The reinforcing bar cutting auxiliary device according to The reinforcing bar receiving surface portion has an abutment portion provided on a surface opposite to the movable blade, The rebar cutting auxiliary device is configured so that the abutment portion can abut against an abutted portion provided in the space within the rebar cutting machine as the conveying portion rotates.

[0012] (6) (5) The rebar cutting auxiliary device according to (5), The rebar cutting machine; a conveying device including the conveying unit; a processor for controlling the rebar cutting machine and the conveying device; Before the movable blade starts to move, a gap is provided between the fixed blade and the reinforcing bar receiving surface portion, The processor rotates the conveying unit to control the gap distance to a threshold value or less, and then starts moving the movable blade. [Effects of the Invention]

[0013] According to (1), the rebar receiving surface is rotatable, so it is easy to keep the rebar horizontal in various situations without putting a load on the rebar cutting machine. By cutting the rebar while keeping it horizontal, the cutting can be performed with high precision.

[0014] According to (2), the end of the rebar receiving surface on the movable blade side can be left free and not connected to anything. This reduces the number of parts in the rebar cutting auxiliary device, which reduces manufacturing costs and makes it smaller. It also simplifies the internal structure of the rebar cutting machine.

[0015] According to (3), the rotation of the second support part enables the rebar receiving surface part to move in accordance with the movement of the movable blade. By providing the second support part outside the rebar cutting machine, the structure of the rebar cutting machine can be simplified.

[0016] According to (4), the rebar cutting auxiliary device can be moved in accordance with the movable blade of the rebar receiving surface by using the conveyor required for the rebar cutting machine. This reduces manufacturing costs compared to when a dedicated rebar cutting auxiliary device is manufactured.

[0017] According to (5), even if the conveying section rotates and the reinforcing bar receiving surface changes, for example, from a horizontal position to an inclined position, the contacting section abuts the non-contacting section, thereby rotating the reinforcing bar receiving surface and returning it to a horizontal position. As a result, the remaining reinforcing bar can be kept horizontal on the reinforcing bar receiving surface, and the remaining reinforcing bar can be properly pushed out horizontally.

[0018] According to (6), the movable blade moves and cuts the rebar while the gap between the fixed blade and the rebar receiving surface is small. Therefore, even when performing a cutting process that generates waste material of the same size as this gap, when cutting the rebar, this gap can be made smaller than the length of the waste material, so that the waste material can be prevented from getting caught in this gap. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of a rebar cutting system 100 according to one embodiment of the technology of the present disclosure. [Figure 2] FIG. 2 is an enlarged perspective view showing the vicinity of the transport device 20 and the rebar cutting auxiliary device 30 in the rebar cutting system 100. As shown in FIG. [Figure 3] FIG. 3 is a schematic diagram of the vicinity of the rebar cutting space SP in the rebar cutting system 100 as viewed from the front. [Figure 4] FIG. 4 is a schematic diagram showing a state where the cutting process of the reinforcing bar has progressed from the state shown in FIG. [Figure 5] FIG. 5 is a diagram showing the state of the reinforcing bar 50 before cutting, which may result in residue close to the distance of the gap CL. [Figure 6] FIG. 6 is a diagram showing a state in which the conveyor support 22 is rotated from the state shown in FIG. 5 to control the distance of the gap CL to be equal to or less than the threshold value. DETAILED DESCRIPTION OF THE INVENTION

[0020] 1 is a diagram showing the schematic configuration of a rebar cutting system 100, one embodiment of the technology disclosed herein. The rebar cutting system 100 includes a rebar cutting machine 10 having a fixed blade 12 and a movable blade 14 that is movable relative to the fixed blade 12 and that can cut rebars with the fixed blade 12 and the movable blade 14, a conveying device 20 that conveys the rebars to a rebar cutting space SP provided inside the rebar cutting machine 10, a rebar cutting auxiliary device 30 supported by the conveying device 20, and a control device 40.

[0021] The control device 40 includes a processor such as a CPU and memories such as RAM and ROM, and the processor controls the rebar cutting machine 10 and the conveying device 20. The control device 40 may be built into the rebar cutting machine 10, may be built into the conveying device 20, or may be provided in a location separate from the rebar cutting machine 10 and the conveying device 20.

[0022] In the following description, the orientation of the rebar cutting system 100 is defined as the direction when the rebar cutting machine 10 is viewed from the front (the side where the operator stands). For example, the front side of the rebar cutting machine 10 is referred to as the forward direction Fr, the back side as the rear direction Rr, the right side as viewed from the front direction R, the left side as the left direction L, the side facing the floor on which the rebar cutting machine 10 is installed as the downward direction D, and the direction opposite the downward direction D as the upward direction U. The forward direction Fr and the rear direction Rr are collectively referred to as the forward / backward direction, the right direction R and the left direction L are collectively referred to as the left-right direction, and the upward direction U and downward direction D are collectively referred to as the up-down direction.

[0023] The front-rear direction is a direction that intersects with the left-right direction and the up-down direction, and in the example of Figure 1, it is perpendicular to the left-right direction and the up-down direction. The up-down direction is the movement direction of the movable blade 14. The left-right direction is the direction in which the reinforcing bar is transported by the transport device 20, and coincides with the axial direction (longitudinal direction) of the transported reinforcing bar. The transport device 20 transports the reinforcing bar from the right direction R to the left direction L. The right direction R can be said to be the upstream side of the transport direction of the reinforcing bar. The left direction L can be said to be the downstream side of the transport direction of the reinforcing bar. The front-rear direction constitutes the first direction. In the following description, the left-right direction and the front-rear direction will be assumed to coincide with the horizontal direction.

[0024] As shown in Figure 1, the rebar cutting machine 10 comprises a support base 11 placed on a support surface such as a floor or the ground, a fixed blade unit 13 including a fixed blade 12 facing in an upward direction U, and a movable blade unit 15 including a movable blade 14 facing in a downward direction D.

[0025] The movable blade unit 15 is provided above the support base 11, and a rebar cutting space SP is formed between the upper surface of the support base 11 and the movable blade unit 15. In the rebar cutting space SP, a fixed blade unit 13 is provided on the left side of the upper surface of the support base 11.

[0026] The conveying device 20 is provided on the right side of the rebar cutting machine 10 and has a shape that is elongated in the left-right direction. The conveying device 20 includes a support table 23 that is placed on a support surface such as the floor or the ground, a conveyor support 22 that is elongated in the left-right direction, and, in the example shown, a plurality of belt conveyors 21 that are supported by the conveyor support 22. The belt conveyors 21 and the conveyor support 22 form a conveying section that conveys rebars.

[0027] The conveyor support 22 has a cross section perpendicular to the longitudinal direction that is Π-shaped, with a bottom surface, a rear surface, and a front surface, and houses the belt conveyor 21 inside. The support base 23 has a rotation shaft 24 extending in the front-to-rear direction at its right end. The bottom surface of the conveyor support 22 is connected to this rotation shaft 24. Therefore, the belt conveyor 21 and the conveyor support 22 are configured to be rotatable around the rotation shaft 24.

[0028] An air cylinder 25 is provided on the support base 23 below the left end of the conveyor support 22. The movable part of the air cylinder 25 is connected to the underside of the conveyor support 22. By operating the air cylinder 25, the conveyor support 22 can be switched between an initial state in which the upper surface of the belt conveyor 21 is horizontal and an inclined state in which the upper surface is inclined downward in the direction D with the right side up relative to the horizontal.

[0029] Figure 2 is an enlarged perspective view showing the vicinity of the conveying device 20 and the rebar cutting auxiliary device 30 in the rebar cutting system 100. As shown in Figure 2, a portion of the left-side L edge of the conveyor support 22 is closed by a wall surface portion 22L that has a thickness in the left-right direction. The rebar cutting auxiliary device 30 is supported by the wall surface portion 22L.

[0030] The rebar cutting auxiliary device 30 includes a rotating shaft 31 extending in the front-rear direction, a pair of shaft holders 32 aligned in the front-rear direction and holding both ends of the rotating shaft 31, a flat plate portion 33 protruding in the left direction L from the wall surface portion 22L and having a thickness direction that coincides with the up-down direction, a pair of protrusions 34 spaced apart in the front-rear direction and protruding upward in the upward direction U from the upper surface of the flat plate portion 33, and a rebar receiving surface portion 35 rotatably supported on the rotating shaft 31. The shaft holder 32 and the flat plate portion 33 are fixed to the wall surface portion 22L. The rebar receiving surface portion 35 is made of a flat plate member having, for example, a rectangular shape in top view.

[0031] The pivot shaft 31 and the shaft holder 32 constitute a first support part 30A that supports the rebar receiving surface 35 so that it can rotate around an axis extending in the front-to-rear direction. The belt conveyor 21 and conveyor support 22 of the transport device 20 support the first support part 30A outside the rebar cutting machine 10 and constitute a second support part 20A that is pivotable around the pivot shaft 24 in response to the movement of the movable blade 14.

[0032] FIG. 3 is a schematic diagram of the vicinity of the rebar cutting space SP in the rebar cutting system 100, seen from the front. FIG. 3 shows the state before the rebar 50 is transported to the cutting position and cutting begins. As shown in FIG. 3, the fixed blade 12 and the movable blade 14 are positioned offset from each other in the left-right direction, with the movable blade 14 positioned to the right of the fixed blade 12. The rebar receiving surface 35 is inserted into the rebar cutting space SP from the right side, with its left end positioned facing the movable blade 14 in the vertical direction. The left edge of the rebar receiving surface 35 faces the right surface of the fixed blade 12, and a gap CL is provided between this left edge and the fixed blade 12. In the state before cutting shown in FIG. 3, the lower end of the rebar 50 contacts the fixed blade 12 and the upper surface of the rebar receiving surface 35, and the upper end of the rebar 50 faces the movable blade 14.

[0033] 3, the rebar cutting auxiliary device 30 is configured so that the upper surface of the belt conveyor 21 and the upper surface of the rebar receiving surface 35 are substantially flush with each other. The rebar receiving surface 35 is rotatable around the rotation axis 31, but its lower surface is kept horizontal by abutting against the tip of the protrusion 34. A protrusion 35A protruding downward in the downward direction D is provided on the lower surface of the left end of the rebar receiving surface 35.

[0034] When the conveyor support 22 rotates around the rotation shaft 24, the left edge of the reinforcing bar receiving surface portion 35 rotates counterclockwise in Figure 3 in conjunction with the conveyor support 22. The gap CL is set to a size that does not interfere with the rotation of the conveyor support 22.

[0035] When the conveyor support 22 rotates from the state shown in Figure 3, the upper surface of the rebar receiving surface 35 moves while remaining parallel to the upper surface of the belt conveyor 21. In other words, when the conveyor support 22 rotates from the state shown in Figure 3, the upper surface of the rebar receiving surface 35 tilts downward in the direction D relative to the left-right direction. A receiving member 16 is fixed to the right surface of the fixed blade unit 13 to return the tilted state of the rebar receiving surface 35 to its original horizontal state. The receiving member 16 is made of, for example, a flat plate member that is thick in the left-right direction. The receiving member 16 is positioned so that its upper end overlaps the movement path of the protrusion 35A when the conveyor support 22 rotates.

[0036] 4 shows the state after starting to cut the reinforcing bar 50 from the state shown in FIG. 3 and completing the cut. The processor of the control device 40 moves the movable blade 14 downward in the direction D from the state shown in FIG. 3. This movement causes the reinforcing bar 50 to be sandwiched between the movable blade 14 and the reinforcing bar receiving surface portion 35, and the movable blade 14 can start cutting the reinforcing bar 50 while keeping the reinforcing bar 50 horizontal. As a result, the reinforcing bar 50 can be cut with high precision.

[0037] When the processor of the control device 40 starts moving the movable blade 14, it controls the conveyor support 22 to rotate counterclockwise (i.e., controls the drive of the air cylinder 25) to follow the movement of the movable blade 14. The dashed line in Figure 4 indicates the position of the rebar receiving surface 35 while the rebar 50 is being cut. As the movement of the movable blade 14 and the rotation of the conveyor support 22 progress and the cutting of the rebar 50 is completed, the protrusion 35A provided on the rebar receiving surface 35 abuts against the upper end of the receiving member 16. The protrusion 35A constitutes the abutting portion, and the receiving member 16 constitutes the abutted portion.

[0038] As a result, the right edge of the reinforcing bar receiving surface 35, which was tilted as shown by the dashed line in the figure, drops and abuts against, for example, the belt conveyor 21, returning it to the horizontal state shown in Figure 3. At this time, a gap may occur between the tip of the protrusion 34 and the underside of the reinforcing bar receiving surface 35, but the abutment of the protrusion 35A with the receiving member 16 and the abutment of the right edge of the reinforcing bar receiving surface 35 with the belt conveyor 21 maintains the horizontal state of the reinforcing bar receiving surface 35.

[0039] 4 shows the remnant material 50A that is generated after cutting the reinforcing bar 50. The remnant material 50A is placed on the reinforcing bar receiving surface 35. The reinforcing bar cutting machine 10 is provided with a remnant material discharge device (not shown). The remnant material 50A is pushed forward Fr by this remnant material discharge device and discharged out of the reinforcing bar cutting space SP.

[0040] As shown in FIG. 4, the waste material discharge device has, for example, a flat plate member 60 that is thick in the front-rear direction and long in the left-right direction. The waste material discharge device pushes the waste material 50A forward by moving the flat plate member 60 from the rear direction Rr to the front direction Fr along the upper surface of the reinforcing bar receiving surface portion 35. As shown in FIG. 4, by returning the reinforcing bar receiving surface portion 35 to a horizontal position, the reinforcing bar receiving surface portion 35 can be prevented from overlapping with the movement path of the flat plate member 60. As a result, the waste material 50A can be properly discharged. Furthermore, there is no need to tilt the flat plate member 60 downward in the direction D from the state shown in FIG. 4, which simplifies the structure of the waste material discharge device.

[0041] 5 is a diagram showing the state of the reinforcing bar 50 before cutting, which may result in waste material close to the distance of the gap CL. In the example of Fig. 5, the width in the left-right direction of the part of the reinforcing bar 50 before cutting that overlaps with the movable blade 14 in the up-down direction is equal to the gap CL.

[0042] 5, there is a possibility that remaining material after cutting the reinforcing bar 50 may become caught in the gap CL. In such a case, it is preferable that the processor of the control device 40 rotates the conveyor support 22 to control the distance of the gap CL to a threshold value or less, and then starts the movement of the movable blade 14 to cut the reinforcing bar 50.

[0043] Figure 6 is a diagram showing a state in which the conveyor support 22 has been rotated from the state shown in Figure 5 to control the distance of the gap CL to a threshold value or less. This threshold value may be a value smaller than the distance of the gap CL in the state shown in Figure 5. As shown in Figure 6, by rotating the conveyor support 22 to reduce the distance of the gap CL before the movable blade 14 moves, it is possible to prevent remnants of the reinforcing bar 50 from being caught in the gap CL when it is subsequently cut. [Explanation of symbols]

[0044] 10 Rebar cutting machine 11,23 Support stand 12 Fixed blade 13 Fixed blade unit 14 Movable blade 15 Movable blade unit 16 Receiving member 20. Conveyor 20A 2nd support part 21 Belt conveyor 22 Conveyor support 22L wall section 24,31 Rotating shaft 25 Air Cylinder 30 Rebar cutting auxiliary device 30A 1st support part 32 Shaft holding part 33 Flat plate part 34 Protrusion 35 Rebar receiving surface 35A protrusion 40 Control device 50 rebar 50A residual material 60 Flat Plate Members 100 Rebar Cutting System

Claims

1. A rebar receiving surface portion is disposed opposite the movable blade in a rebar cutting machine having a fixed blade and a movable blade, and clamps the rebar before cutting together with the movable blade; A rebar cutting auxiliary device comprising: a first support portion that supports the rebar receiving surface portion so that it can rotate around an axis extending in a first direction that intersects the axial direction of the rebar and the movement direction of the movable blade.

2. The reinforcing bar cutting assist device according to claim 1, The first support portion supports the end portion of the reinforcing bar receiving surface portion opposite the movable blade side in the axial direction.

3. The reinforcing bar cutting assist device according to claim 2, A rebar cutting auxiliary device comprising a second support part that supports the first support part outside the rebar cutting machine and is configured to be rotatable around a rotation axis extending in the first direction in response to the movement of the movable blade.

4. The reinforcing bar cutting assist device according to claim 3, The second support unit is a conveying unit that conveys the reinforcing bar before cutting to the reinforcing bar cutting machine, The conveying section is configured to be rotatable around an upstream end of the reinforcing bar in the conveying direction as a fulcrum, The first support portion is a rebar cutting auxiliary device supported at a downstream end of the conveying portion in the conveying direction.

5. The reinforcing bar cutting assist device according to claim 4, The reinforcing bar receiving surface portion has an abutment portion provided on a surface opposite to the movable blade, The rebar cutting auxiliary device is configured so that the abutment portion can abut against an abutted portion provided in the space within the rebar cutting machine as the conveying portion rotates.

6. The reinforcing bar cutting auxiliary device according to claim 5; The rebar cutting machine; a conveying device including the conveying unit; a processor for controlling the rebar cutting machine and the conveying device; Before the movable blade starts to move, a gap is provided between the fixed blade and the reinforcing bar receiving surface portion, The processor rotates the conveying unit to control the gap distance to a threshold value or less, and then starts moving the movable blade.

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