Cutting machine and device to prevent cut protrusions from falling.

Abstract

To provide a cutting machine which cuts a protrusion of a steel frame column that is erected and includes a fall prevention function of the cut protrusion.SOLUTION: There is provided a cutting machine 21 which cuts a protrusion 25 that is provided in a protruding manner on a steel frame part 24a of a steel frame column 24 that is erected. The cutting machine includes a magnetic type fixture for attachment guide and a cutting machine body 23. The cutting machine body includes a fall prevention device 51 of the protrusions installed on a rear column 38 and a rear cross plate 49. The fall prevention device includes: a T-shaped plate material 52 which is mounted on the rear column and the rear cross plate; a slide member 55 which is bolted by adjusting the position in the front-rear direction with respect to a long hole 53 for movement of the T-shaped plate material; and a receiving member 57 which is bolted 56 in a state of holding the protrusions by adjusting the position in the vertical direction with respect to the slide member.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a cutting machine and a fall prevention device for cut protrusions, which has a function of preventing fall of cut protrusions obtained by cutting protrusions such as hanging pieces, erection pieces, guide pieces or joint plates protruding from connection parts of steel columns and the like in steel structures or reinforced concrete structures.

Background Art

[0002] Conventionally, as this type of cutting machine, those having the configurations shown in Fig. 14 and Fig. 15 are known. This cutting machine 1 comprises four strong magnetic attachment parts 2 detachably attached to a steel column, rail guide posts 3 respectively provided on each attachment part 2, a moving guide rail 4 provided spanning across the front and rear rail guide posts 3, a moving roller 5 for moving along the moving guide rail 4, a mounting substrate 7 connected to the moving roller 5 and having a cutting opening 6 at the central part for a protrusion (workpiece to be cut) to pass through, a drive motor 8 provided on the mounting substrate 7, a drive roller 9 driven in conjunction with the driving of the drive motor 8 and provided on the mounting substrate 7, a pair of driven rollers 10 provided on the mounting substrate 7 opposite to the drive roller 9, and a band saw 11 rotated by the driven rollers 10 and the drive roller 9 (see Patent Document 1).

[0003] When cutting the protrusion 13 with the cutting machine 1 having such a configuration, as shown in Fig. 16, the four attachment parts 2 opposed to the protrusion 13 of the erected steel column 12 are magnetically attached to the steel column 12, then the drive motor 8 is driven to rotate the band saw 11 at a high speed.

[0004] Then, the mounting substrate 7 descends along the moving guide rail 4 by its own weight, the cutting opening 6 of the mounting substrate 7 passes through the protrusion 13, and the band saw 11 cuts the protrusion 13.

Prior Art Literature

Patent Literature

[0005] [Patent Document 1] Japanese Patent Publication No. 2006-21265 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] In this conventional example of a cutting machine 1, the band saw 11 prevents the cut protrusion 13 from falling by grasping the protrusion 13 with its hand just before it finishes cutting it. However, if the timing of grasping the projection 13 with one's hand is incorrect and one fails to grasp it, or if one forgets to grasp it with one's hand, the projection 13 may fall downwards, posing a significant danger.

[0007] Therefore, the conventional cutting machine 1 has a problem that must be solved by providing a mechanism to prevent the cut protrusion 13 from falling downwards. [Means for solving the problem]

[0008] The gist of the present invention, which solves the problems of the aforementioned conventional example, is a cutting machine that cuts projections protruding from the steel frame of a steel column or steel frame material to be erected, and has a function to prevent the cut projections from falling, the cutting machine being composed of a magnetic mounting jig for mounting guides and a cutting machine body, the mounting jig comprising at least a center plate for marking at the central position and a locking recess on the rear side, the cutting machine body comprising a locking bar on the front side, front support columns provided at both ends of the locking bar, a pair of magnetic rear mounting parts on the rear side and rear parts provided at each rear mounting part A support column, a rear horizontal plate provided between each rear support column, a movable guide rail provided between the front support column and the rear support column, a guide holder movable along the movable guide rail, a mounting base plate connected to the guide holder and having a cutting opening in the center for the projection to pass through, a drive motor provided on the mounting base plate, a drive roller provided on the mounting base plate that is driven in conjunction with the drive motor, a pair of driven rollers provided on the mounting base plate opposite the drive roller, and a rotating mechanism between the driven roller and the drive roller. Ba The device comprises at least a cutting saw and a fall prevention device installed on the rear support column and the rear horizontal plate, which holds the cut protrusions and prevents them from falling.

[0009] Furthermore, the fall prevention device consists of a T-shaped plate placed on the rear support column and the rear horizontal plate, a sliding member that is bolted in place after being positioned in the front-to-back direction with respect to the movable elongated hole of the T-shaped plate, and a receiving member that is bolted in place after being positioned in the up-to-down direction with respect to the sliding member to grip the projection.

[0010] The gist of the present invention, which solves the problems of the aforementioned conventional example, is a fall prevention device for a protrusion, which is provided on a cutting machine for cutting protrusions that are attached to the steel frame of a steel column or steel frame material to be erected, and which holds the cut protrusion to prevent it from falling. The fall prevention device consists of a T-shaped plate installed on the cutting machine, a sliding member which is bolted to the T-shaped plate after its position is adjusted in the front-to-back direction with respect to a movable elongated hole, and a receiving member which is bolted to the sliding member after its position is adjusted in the up-to-down direction to hold the protrusion. [Effects of the Invention]

[0011] According to the cutting machine and projection fall prevention device of the present invention, the receiving member holds the cut projection in a clamped position, so the cut projection does not fall downward. Therefore, it is possible to prevent accidents involving falling projections, thus providing the excellent effect of improving safety. [Brief explanation of the drawing]

[0012] [Figure 1] This is a plan view of the cutting machine according to the present invention. [Figure 2] This is a side view of the cutting machine according to the present invention, before cutting off a protrusion. [Figure 3] This is a side view of the cutting machine according to the present invention after the protrusion has been cut off. [Figure 4] This is a perspective view of the mounting jig and the cutting machine body. [Figure 5] This is a front view of the cutting machine body. [Figure 6] This is a perspective view showing a portion of the rear side of the cutting machine body and the fall prevention device. [Figure 7] This is a perspective view showing a fall prevention device. [Figure 8] This is a plan view of a T-shaped plate. [Figure 9] This is a perspective view showing the bottom side of the T-shaped plate. [Figure 10] This is a perspective view of the sliding component. [Figure 11] This is a side view of the sliding component. [Figure 12] It is a perspective view of the receiving member. [Figure 13] It is a perspective view of the back side of the receiving member. [Figure 14] It is a perspective view of a cutting machine according to a conventional example. [Figure 15] It is a perspective view of a cutting machine according to a conventional example. [Figure 16] It is a perspective view illustrating the use state of a cutting machine according to a conventional example. [Mode for Carrying Out the Invention]

[0013] Next, embodiments of the present invention will be described with reference to the drawings. First, in FIGS. 1 to 3, reference numeral 21 indicates a cutting machine, and this cutting machine 21 is composed of a magnetic mounting jig 22 for a mounting guide and a cutting machine body 23. Note that the plan view of the cutting machine 21 in FIG. 1 and the side views of the cutting machine 21 in FIGS. 2 and 3 show a cut projection drop prevention device 51. The perspective view of the mounting jig 22 and the cutting machine main body 23 in FIG. 4 shows a state where the drop prevention device 51 is not drawn.

[0014] The cutting machine 21 is a cutting machine for cutting projections 25 projecting from a standing steel column 24 or a steel frame portion 24a such as a steel material (see FIGS. 2 and 3). The projections 25 are lifting pieces, erection pieces, guide pieces, joint plates or the like that project from steel columns and the like in steel structures and reinforced concrete structures.

[0015] As shown in FIGS. 1 to 4, the mounting jig 22 includes a magnetic front mounting portion 26 that is detachably attached to the steel portion 24a, and a connecting portion 27 adjacent to the front mounting portion 26. The front attachment portion 26 is formed in a box shape, and is provided with a strong magnetic magnetic attachment portion 28 at the lower portion (see FIGS. 2 to 4). It is structured such that it can be strongly magnetically attached to or detached from the steel portion 24a by ON / OFF operation of the lock handle 29. A pair of positioning frames 31 are provided on both sides of the connecting portion 27, and the positioning frames 31 have locking recesses 32 formed therein (see Figures 2 to 4). The positioning frames 31 can be adjusted along the elongated holes 31a by tightening and loosening bolts 33, and the position of the locking recesses 32 can be adjusted. Furthermore, a center plate 34 is provided at the center of the lower side of the connection section 27 for use as a marker.

[0016] As shown in Figures 1 to 4, the cutting machine body 23 includes a locking bar 35 that rotatably locks into a locking recess 32 of the mounting jig 22, front support columns 36 provided at both ends of the locking bar 35, a pair of powerful magnetic rear mounting parts 37 that are detachably magnetically attached to the steel part 24a, rear support columns 38 provided on each rear mounting part 37, a rear horizontal plate 49 provided between each rear support column 38, a movable guide rail 39 provided between the front support column 36 and the rear support column 38, a guide holder 40 that can move along the movable guide rail 39, and a guide holder The device comprises a mounting base plate 41 connected to the saw blade 40 and having a cutting opening 50 (see Figure 5) in the center through which the projection 25 passes; a drive motor 42 provided on the mounting base plate 41; a drive roller 43 provided on the mounting base plate 41 and driven in conjunction with the drive motor 42; a pair of driven rollers 44 provided on the mounting base plate 41 opposite the drive rollers 43; and a band saw 45 that rotates with the driven rollers 44 and the drive rollers 43. Furthermore, it is equipped with a fall prevention device 51 installed on the rear support column 38 and the rear horizontal plate 49 to hold the cut projection 25 and prevent it from falling. In Figures 2 to 4, reference numeral 47 indicates a movable auxiliary rail, and reference numeral 48 indicates a front cross plate in Figures 1 and 4.

[0017] The locking bar 35 is formed in a cylindrical shape of a predetermined length, and a locking groove 46 is formed in the middle of it that fits into the locking recess 32 (see Figure 4). By fitting the locking groove 46 into the locking recess 32, the center plate 34 and the cut opening 50 of the mounting base plate 41 are positioned in a straight line.

[0018] The rear mounting sections 37 are provided on both sides of the rear of the cutting machine body 23, are box-shaped, and have powerful magnets. They can be firmly attached to or detached from the steel section 24a by turning the switch 37a ON / OFF. Furthermore, each rear mounting section 37 is provided with a rear support column 38 (see Figures 1 to 4). A rear cross plate 49 is provided spanning between each rear support column 38 (see Figures 1 to 4).

[0019] The movable guide rail 39 is provided between the front support column 36 and the rear support column 38, and a guide holder 40 that can move along the movable guide rail 39 is attached to it.

[0020] The guide holder 40 is formed to clamp the movable guide rail 39, and is designed to move (descend) by sliding along the movable guide rail 39. The guide holder 40 is also connected to the mounting base plate 41.

[0021] The mounting base plate 41 is formed to a predetermined size, and both sides of the mounting base plate 41 are connected to the guide holder 40. The mounting base plate 41 descends along the movable guide rail 39 due to its own weight, and the cutting opening 50 of the mounting base plate 41 passes through the projection 25, allowing the band saw 45 to cut the projection 25. In other words, a cutting opening 50 for the projection 25 to pass through is formed in the central part of the mounting substrate 41 (see Figure 5).

[0022] As shown in Figure 5, the cutting opening 50 has a vertically formed edge 50a. Therefore, it can cut through the vertically protruding projection 25.

[0023] The drive motor 42 is mounted on the mounting board 41, and is driven and stopped by the ON / OFF operation of the switch 42a.

[0024] The drive roller 43 is designed to be driven in conjunction with the drive motor 42 and is mounted on the mounting base plate 41. The drive roller 43 is made up of a pulley that is larger than the driven roller 44, and a rotating band saw 45 is wrapped around it to transmit power to the driven roller 44.

[0025] The driven roller 44 is mounted on the mounting base plate 41 opposite the drive roller 43. The driven roller 44 and the drive roller 43 are arranged so that the band saw 45 is perpendicular to the projection 25.

[0026] The band saw 45 is a wire-type rotary cutter that rotates at high speed via a drive roller 43 and a driven roller 44.

[0027] As shown in Figures 6 and 7, the projection fall prevention device 51 consists of a T-shaped plate 52 that rests on the rear support column 38 and the rear horizontal plate 49, a sliding member 55 that is positioned in the front-rear direction relative to the movable elongated hole 53 of the T-shaped plate 52 and then bolted 54 (see Figures 9 and 11), and a receiving member 57 that is positioned in the up-down direction relative to the sliding member 55 and bolted 56 while the projection 25 is being held between them.

[0028] The T-shaped plate material 52 is a metal plate material formed in a T-shape, and consists of a long side portion 58 and a short side portion 59. As shown in Figure 9, grooves 60 are formed on both sides of the bottom of the long side portion 58. The grooves 60 are for fitting onto the rear support column 38. A spring plate 61 is provided near the grooves 60, and this spring plate 61 abuts against the rear support column 38 to maintain the fitted state with the grooves 60. As shown in Figure 9, a groove 62 is formed at the bottom of the short side portion 59. The groove 62 is a portion for fitting into the rear horizontal plate 49. Furthermore, the T-shaped plate material 52 has a movable elongated hole 53 formed therein. As shown in Figure 9, the movable elongated hole 53 is a part into which a bolt 54 is inserted from the bottom side and fastened with the bolt 54 into the bolt hole 63 at the bottom of the sliding member 55.

[0029] As shown in Figures 10 and 11, the sliding member 55 is a metal material formed in the shape of a box, and has a bolt hole 63 at the bottom into which a bolt 54 is screwed. It also has a bolt hole 64 at the front into which a bolt 56 is screwed.

[0030] As shown in Figures 12 and 13, the receiving member 57 is formed by bending a metal plate into a U-shape, and has an elongated hole 65 for vertical position adjustment on its front surface. The elongated hole 65 for vertical position adjustment is the part where the receiving member 57 is positioned vertically relative to the sliding member 55 before being fastened with a bolt 56. Furthermore, a pair of clamping pieces 66 are provided on the upper sides. The clamping pieces 66 are the parts that clamp the projection 25 between them. A receiving portion 67 is provided on the inside of the clamping pieces 66, and the receiving portion 67 receives the projection 25.

[0031] Next, we will explain the installation procedure for attaching the cutting machine 21 described above to the steel frame section 24a, such as the steel columns 24 and steel structural materials to be erected. First, as shown in Figure 2, the mounting jig 22 is magnetically attached to an appropriate position above the protrusion 25 on the steel frame section 24a.

[0032] Then, the locking bar 35 of the cutting machine body 23 is locked into the locking recess 32 of the mounting jig 22. In this case, the locking groove 46 of the locking bar 35 is fitted into the locking recess 32 (see Figure 4). By fitting the locking recess 32 into the locking groove 46, the center plate 34 and the cut opening 50 of the mounting base plate 41 are positioned in a straight line.

[0033] Furthermore, the rear mounting portion 37 is magnetically attached to the steel frame portion 24a (see Figure 2). In this case, the locking bar 35, which is locked in the locking recess 32, is rotated to magnetically attach the rear mounting portion 37 to the steel frame portion 24a.

[0034] By attaching the cutting machine 21 to the steel frame section 24a in this manner, the projection 25 will be positioned directly below the cutting opening 50 of the mounting base plate 41. The mounting base plate 41 descends along the movable guide rail 39 due to its own weight, and the cutting opening 50 of the mounting base plate 41 passes over the protrusion 25, allowing the band saw 45 to cut the protrusion 25.

[0035] Next, we will explain the procedure for preventing the object from falling by using the fall prevention device 51 to grip the protrusion 25. First, as shown in Figure 6, the grooves 60 on both sides of the long side 58 of the T-shaped plate 52 are placed on the rear support column 38 and fitted together. At this time, the spring plate 61 (see Figure 9) comes into contact with the rear support column 38, maintaining the fitted state with the grooves 60. Simultaneously, the grooves 62 of the short side 59 are placed on the rear horizontal plate 49 and fitted together.

[0036] Then, the movable elongated hole 53 of the T-shaped plate 52 is aligned with the bolt hole 63 of the slide member 55, and the slide member 55 is moved along the movable elongated hole 53 to adjust its position in the front-rear direction relative to the steel frame 24a (i.e., relative to the projection 25) (see arrow in Figure 6). In other words, the clamping piece 66 is positioned to be able to clamp the projection 25. Furthermore, the bolt 54, which has been inserted through the movable elongated hole 53, is screwed into the bolt hole 63 of the slide member 55 and tightened.

[0037] Next, the vertical position of the receiving member 57 is adjusted (see arrow in Figure 6) to clamp the clamping piece 66 onto the projection 25, and the bolt 56 is inserted through the elongated hole 65 for vertical position adjustment, and the bolt 56 is screwed into the bolt hole 64 of the sliding member 55 and tightened. Following this procedure, the protrusion 25 is held in place by the clamping piece 66 of the fall prevention device 51, as shown in Figure 2.

[0038] The mounting base plate 41 descends along the moving guide rail 39 due to its own weight, the cutting opening 50 passes over the projection 25, and the band saw 45 cuts the projection 25. As shown in Figure 3, the cut projection 25 is held in place by the clamping piece 66 while being received by the receiving part 67 (see Figures 12 and 13), so it does not fall downward. The projection 25, which is gripped by the clamping piece 66, can then be removed by hand.

[0039] In the cutting machine 21 and the fall prevention device 51 for the cut protrusions configured as described above, the cut protrusion 25 is caught by the receiving part 67 and then held by the clamping piece 66, so the protrusion 25 does not fall downward. Therefore, accidents involving the falling of the protrusion 25 can be prevented, and safety is improved. [Explanation of Symbols]

[0040] 1 cutting machine 2 Mounting part 3 Rail guide posts 4. Guide rails for movement 5. Mobile roller 6 Cutting opening 7 Mounting board 8 Drive motor 9 Drive rollers 10 Driven rollers 11 Bandsaw 12 Steel columns 13 Projection (object to be cut) 14 switches 21 Cutting machine 22 Mounting jig 23 Cutting machine body 24 Steel columns 24a Steel frame section 25 Protrusions 26 Front mounting section 27 Connection part 28 Magnetized part 29 Lock handle 30 Stoppers 31 Positioning frame 31a long hole 32 Recess for locking 33 volts 34 Center Plate 35 Locking bar 36 Front support column 37 Rear mounting section 37a switch 38 Rear support 39. Guide rail for movement 40 Guide Holder 41 Mounting board 42 Drive motor 42a switch 43 Drive rollers 44 Driven roller 45 Bandsaw 46 Locking groove 47. Auxiliary rail for movement 48 Front transverse plate 49 Rear transverse plate 50 cutting opening 50a Edge 51 Fall protection device 52 T-shaped plate 53 Slot for movement 54 volts 55 Sliding member 56 volts 57 Receiving member 58 Long side 59 Short side 60 groove 61 Spring Plate 62 Groove 63 bolt holes 64 bolt holes 65 Long hole for vertical position adjustment 66 Clamping piece 67 Receiving part

Claims

1. A cutting machine that cuts off protrusions attached to the steel frame of erected steel columns and steel structural members, and is equipped with a function to prevent the cut protrusions from falling, The cutting machine consists of a magnetic mounting jig for mounting guides and the cutting machine body. The aforementioned mounting jig is A center plate for marking the central position, It comprises at least a locking recess on the rear side, The cutting machine body is A locking bar is provided on the front side, Front support posts provided at both ends of the locking bar, A pair of magnetic rear mounting parts are provided on the rear side, Rear support columns provided at each rear mounting point, A rear cross plate is installed between each rear support column, A movable guide rail is provided between the front support column and the rear support column, A guide holder that can move along the movable guide rail, A mounting base plate connected to the guide holder and having a cutting opening in the center for the projection to pass through, A drive motor provided on the mounting board, A drive roller is provided on the mounting board and is driven in conjunction with the drive motor, A pair of driven rollers are provided on the mounting base plate opposite to the drive roller, The system comprises at least a band saw that rotates on the driven roller and the drive roller, Furthermore, it has a fall prevention device installed on the rear support column and the rear horizontal plate, which holds the cut protrusion and prevents it from falling. A cutting machine characterized by the following.

2. The aforementioned fall prevention device is A T-shaped plate material to be placed on the rear support column and the rear horizontal plate, A sliding member that is bolted in place after adjusting its position in the front-to-back direction relative to the elongated movable hole of the T-shaped plate, It consists of a receiving member that is bolted to the sliding member after adjusting its vertical position to grip the projection. A cutting machine according to claim 1, characterized by the following:

3. A device for preventing the fall of protrusions, which is installed on a cutting machine that cuts off protrusions attached to the steel frame of steel columns or steel structural members to be erected, and which grips the cut protrusions to prevent them from falling, The fall prevention device is A T-shaped plate to be installed in the cutting machine, A sliding member that is bolted in place after adjusting its position in the front-to-back direction relative to the elongated movable hole of the T-shaped plate, It consists of a receiving member that is bolted to the sliding member after adjusting its vertical position to grip the projection. A device to prevent the falling of severed protrusions, characterized by the following features.

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