Cutting machine

Abstract

To provide a cutting machine for cutting a temporary fixing bracket of a support which is provided hanging at a lower part of a main girder lower flange of a steel bridge.SOLUTION: A cutting machine 21 includes: a clamp part 25 to be attached to an end 22a of a main girder lower flange 22 with a first bolt 32; a clamp part frame 26 rotatably connected to the clamp part; a first mobile guide rail 27; a magnet type attachment part 28 which is magnetically attached to a lower part of the main girder lower flange; a magnet type attachment part frame 29 connected to the magnet type attachment part; a second mobile guide rail 30; a guide holder 31; an attachment substrate 34; a driving motor provided at the attachment substrate; a motor pulley 36; a pair of auxiliary pulleys 37 which is provided facing the motor pulley; a band saw 38; and towing means for towing the attachment substrate.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a cutting machine for cutting temporary fixing fittings for bearings that are hung down from the lower flange of the main girder of a steel bridge. [Background technology]

[0002] The temporary fixing fittings that temporarily fix the bearings are cut and removed after the mortar that forms the pier has hardened. When cutting the temporary fixing brackets of bearings, they are usually cut by burning them off with a gas burner. In the finishing stage, a grinder is used to rotate a disc-shaped grinding stone for finishing work. Alternatively, a chip saw cutter may be used to rotate the chip saw to cut the temporary fixing brackets.

[0003] On the other hand, although not for temporary fixing fittings for supports, a cutting machine 1 having a configuration shown in Figs. 11 and 12 is known as a cutting machine for hanging pieces for steel columns and the like. This cutting machine 1 is composed of four powerful magnetic mounting sections 2 that can be detachably attached to a steel column, rail guide supports 3 attached to each mounting section 2, a movable guide rail 4 that is installed between the front and rear rail guide supports 3, movable rollers 5 that move along the movable guide rails 4, a mounting base 7 that is connected to the movable rollers 5 and has a cutting opening 6 in the center for passing a protrusion (object to be cut) 13 through, a drive motor 8 attached to the mounting base 7, a drive roller 9 that is driven in conjunction with the drive of the drive motor 8 and is attached to the mounting base 7, a pair of driven rollers 10 attached to the mounting base 7 opposite the drive roller 9, and a band saw 11 that rotates with the driven roller 10 and drive roller 9 (see Patent Document 1).

[0004] When cutting a protrusion 13 with a cutting machine 1 configured in this manner, as shown in Figure 13, the four mounting portions 2 are magnetically attached to the steel column 12 so as to face the protrusion 13 on the steel column 12 to be erected, and then the drive motor 8 is driven to rotate the band saw 11 at high speed.

[0005] Then, the mounting substrate 7 descends along the movement guide rail 4 due to its own weight, the cutting opening 6 of the mounting substrate 7 passes through the protrusion 13, and the band saw 11 cuts off the protrusion 13. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-21265 Summary of the Invention [Problem to be solved by the invention]

[0007] When using a conventional gas burner, not only is there a risk of sparks falling and causing a fire, but work is also difficult and there is a risk of the object being cut (temporary fixing metal fittings) falling. When using a grinder, the worker must work upward while sparks and iron powder fall toward him, making the work less efficient. When using a chip saw cutter, a lot of sparks and chips are generated, which fly in all directions, making work difficult. Also, since chip saw cutters are operated by hand, it is difficult for one person to catch the temporary fixing brackets, which weigh more than 10 kg, after cutting. Therefore, the work must be done by two workers, which causes various problems such as poor work efficiency.

[0008] On the other hand, the conventional cutting machine 1 is attached vertically to the erected steel column 12, and its own weight lowers the mounting base 7 to perform cutting. Therefore, the temporary fixing bracket that is hung down from the lower flange of the main girder cannot be cut because the mounting base 7 cannot be moved. Even if the mounting base plate 7 is moved, the cutting machine 1 is attached upward under the lower flange of the main girder, so there is a problem in that it is quite a complicated and troublesome task to accurately determine the attachment position and attach the cutting machine 1 so that the cutting opening 6 of the mounting base plate 7 can pass through and cut without hindrance to the temporary fixing bracket.

[0009] Therefore, in the case of the conventional example, there are problems that must be solved: preventing the generation of sparks and fire, and preventing the temporary fixing metal fittings from falling after cutting. Furthermore, in the case of the conventional cutting machine 1, there are problems that must be solved, namely, providing a mechanism for cutting the temporary fixing bracket below the lower flange of the main girder, and attaching the temporary fixing bracket accurately and quickly so that the cutting opening 6 can pass through without hindrance. [Means for solving the problem]

[0010] The gist of the present invention for solving the problems of the above-mentioned conventional examples is a cutting machine for cutting temporary fixing fittings of bearings that are installed in a hanging state below the main girder lower flange of a steel bridge, the cutting machine comprising: a pair of clamping units attached with first bolts to the ends of the main girder lower flange that protrudes a predetermined length from the main girder web of the steel bridge; a clamping unit frame that is connected to the clamping units and can rotate around a second bolt; a first movement guide rail that is installed between the clamping unit frames; a pair of magnetic mounting units that can be magnetically attached to the lower part of the main girder lower flange; a magnetic mounting unit frame that is connected to the magnetic mounting units; a second movement guide rail that is installed between the magnetic mounting unit frames; a guide holder that can move along the first movement guide rail and the second movement guide rail; a mounting base that is connected to the guide holder and has a cutting opening in the center for passing the temporary fixing fittings; a drive motor that is installed on the mounting base; The band saw comprises at least a motor pulley that drives in conjunction with the drive of the drive motor and is provided on the mounting base, a pair of auxiliary pulleys that are provided on the mounting base opposite the motor pulley, a band saw that rotates while being wrapped around the auxiliary pulley and the motor pulley, and a pulling means that is provided to pull the mounting base along the first movement guide rail and the second movement guide rail.

[0011] Further, a reinforcing bar is provided across the clamp unit frame and the magnetic mounting unit frame; the clamp unit is provided with a stopper pin for stopping the rotation of the clamp unit frame, and the second bolt for maintaining the clamp unit and the clamp unit frame in a fixed state; The first movement guide rail and / or the second movement guide rail are provided with a guide holder stopper pin that stops the movement of the guide holder; the traction means being a retractable strap spring; It includes: [Effects of the Invention]

[0012] With the cutting machine of the present invention, the clamp unit frame is rotated and tilted relative to the clamp unit, the clamp unit is attached to the end of the main girder lower flange with the first bolt, and then the clamp unit frame is rotated to return to the original tilt, and the magnetic mounting unit is magnetically attached to the lower part of the main girder lower flange, thereby allowing the cutting machine to be quickly and accurately attached to a position where the temporary fixing bracket can cut. In other words, even when working upward under the lower flange of the main girder, the cutting machine can be quickly and reliably attached to a position where the cutting opening can pass through the temporary fixing bracket without any hindrance. In addition, no sparks or powder are generated during cutting. The band saw rotates in one direction relative to the temporary fixture, so chips are discharged in one direction. The band saw is thin, so the amount of chips discharged is small. Furthermore, because the mounting base is propelled by the winding force of the wind-up belt spring, the worker can keep both hands free to securely catch the temporary fastening fittings after cutting. This allows the worker to work alone, resulting in a variety of excellent effects, such as improved work efficiency.

[0013] By providing a reinforcing bar across the clamp unit frame and the magnetic mounting unit frame, the clamp unit frame and the magnetic mounting unit frame are connected via the reinforcing bar, which has the excellent effect of increasing the strength of the cutting machine.

[0014] The clamp is provided with a stopper pin for stopping the rotation of the clamp frame and a second bolt for maintaining the fixed state between the clamp and clamp frame, so that removing the stopper pin and loosening the second bolt allows the clamp frame to rotate. Also, inserting the stopper pin and tightening the second bolt has the excellent effect of firmly maintaining the fixed state between the clamp and clamp frame.

[0015] The first moving guide rail and / or the second moving guide rail are provided with a guide holder stopper pin that stops the movement of the guide holder, which has the excellent effect of allowing the movement of the mounting substrate connected to the guide holder to be stopped by inserting the guide holder stopper pin as needed.

[0016] The traction means is a retractable belt-shaped spring, which has the excellent effect of allowing the mounting substrate to move smoothly along the first movement guide rail and the second movement guide rail by pulling the spring with the pull string and hanging it on the spring hanging shaft and pulling out the guide holder stopper pin. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a front view of a cutting machine according to the present invention. [Figure 2] FIG. 1 is a plan view of a cutting machine according to the present invention. [Figure 3] FIG. 2 is a right side view of the cutting machine according to the present invention. [Figure 4] FIG. 2 is a left side view of the cutting machine according to the present invention. [Figure 5] 10A and 10B are front views illustrating a procedure for attaching the cutting machine relative to the temporary fixing bracket. [Figure 6] 10A and 10B are front views of the vicinity of the clamp portion, illustrating the procedure for attaching the cutting machine relative to the temporary fixing bracket. [Figure 7] 10A and 10B are front views illustrating a procedure for attaching the cutting machine relative to the temporary fixing bracket. [Figure 8] FIG. 10 is a right side view illustrating a procedure for attaching the cutting machine relative to the temporary fixing bracket. [Figure 9] FIG. 10 is a right side view illustrating the state in which the cutting machine is attached opposite to the temporary fixing metal fitting and cutting is performed. [Figure 10] FIG. 10 is a right side view illustrating the state in which the cutting machine is cutting the temporary fixing metal fitting. [Figure 11] FIG. 10 is a perspective view of a conventional cutting machine. [Figure 12] FIG. 10 is a perspective view of a conventional cutting machine. [Figure 13] FIG. 10 is a perspective view illustrating a state in which a conventional cutting machine is used. DETAILED DESCRIPTION OF THE INVENTION

[0018] Next, an embodiment of the present invention will be described with reference to the drawings. The cutting machine 21 of the present invention is a cutting machine for cutting a temporary fixing bracket 24 of a bearing that is installed in a hanging state below a main girder lower flange 22 of a steel bridge and directly below a main girder web 23 (see Figures 7 and 8).

[0019] 1 to 4, reference numeral 21 denotes a cutting machine, and this cutting machine 21 includes a pair of clamping sections 25, a clamping section frame 26 rotatably connected to the clamping sections 25, a first movement guide rail 27 provided between the clamping section frames 26, a pair of magnetic mounting sections 28, a magnetic mounting section frame 29 connected to the magnetic mounting sections 28, a second movement guide rail 30 provided between the magnetic mounting section frames 29, and a guide rail 30 movable along the first movement guide rail 29 and the second movement guide rail 30. The guide holder 31 is made up of a guide rail 31, a mounting base 34 connected to the guide holder 31, a drive motor 35 provided on the mounting base 34, a motor pulley 36 that drives in conjunction with the drive of the drive motor 35 and is provided on the mounting base 34, a pair of auxiliary pulleys 37 that are provided on the mounting base 34 opposite the motor pulley 36, a band saw 38 that rotates while being wrapped around the auxiliary pulley 37 and the motor pulley 36, and a pulling means 39 that is provided to pull the mounting base 34 along the first movement guide rail 27 and the second movement guide rail 30.

[0020] As shown in FIG. 1, the clamp portion 25 is formed in a U-shape and includes an upper piece 25a and a lower piece 25b, and a first bolt 32 is screwed into the upper piece 25a. As shown in Figures 5 to 7, this clamp portion 25 is attached by screwing a first bolt 32 to the end portion 22a of the main girder lower flange 22 that protrudes from the main girder web 23 of the steel bridge by approximately 100 to 125 mm.

[0021] 1, clamp unit frame 26 is attached to clamp unit 25 with second bolts 40, and by tightening second bolts 40, the clamp unit 25 and clamp unit frame 26 can be firmly fixed together. By loosening second bolts 40, clamp unit frame 26 can be rotated relative to clamp unit 25. That is, the clamp portion frame 26 is connected to the clamp portion 25 so as to be rotatable around the second bolt 40 . Furthermore, as shown in FIG. 1, the clamp portion 25 is provided with a stopper pin 41 that can be inserted to stop the rotation of the clamp portion frame 26. Therefore, by removing the stopper pin 41 and loosening the second bolt 40, the clamp unit frame 26 can be rotated. Furthermore, by inserting the stopper pin 41 and tightening the second bolt 40, the clamp unit 25 and the clamp unit frame 26 can be firmly maintained in a fixed state.

[0022] As shown in Figures 2 and 4, the clamp unit 25 and the clamp unit frame 26 are provided in two locations, at the front and rear of the cutting machine 21; that is, a pair of clamp units 25 and clamp unit frames 26 of the same shape are provided at the front and rear.

[0023] As shown in FIGS. 1 and 4, the clamp unit frame 26 is made up of an upper portion 26a attached to the clamp unit 25 with a second bolt 40 and a lower portion 26b attached to the upper portion 26a with a third bolt 42.

[0024] As shown in Figures 2 and 4, the first movement guide rails 27 are provided across the front and rear clamp unit frames 26, and as shown in Figure 4, a pair of first movement guide rails 27 are provided on the upper and lower sides.

[0025] As shown in Figures 1 to 3, the magnetic mounting portion 28 is box-shaped and is magnetic or electromagnet type, and can be firmly magnetically attached to or detached from the lower part of the main girder lower flange 22 by turning the switch 28a on / off (see Figure 7). 1 and 3, a magnetic mounting frame 29 is attached to the magnetic mounting portion 28 with a fourth bolt 43. As shown in FIG.

[0026] As shown in Figure 3, the magnetic mounting portion 28 and the magnetic mounting portion frame 29 are provided in two locations, at the front and rear of the cutting machine 21. In other words, a pair of magnetic mounting portions 28 and magnetic mounting portion frames 29 of the same shape are provided at the front and rear.

[0027] As shown in Figures 1 and 3, the magnetic mounting frame 29 consists of an upper part 29a connected to the magnetic mounting part 28 and a lower part 29b attached to the upper part 29a with a fourth bolt 43. An elongated hole 44 is formed in the upper portion 29a, and a fourth bolt 43 is screwed into this elongated hole 44. The lower portion 29b can be moved up and down along the elongated hole 44 of the upper portion 29a, that is, the magnetic mounting frame 29 can be moved up and down, and this movement allows the mounting position of the mounting board 34 to be finely adjusted in the vertical direction.

[0028] 1 and 2, a reinforcing bar 46 is provided at a position spanning the magnetic mounting frame 29 and the clamping frame 26. Therefore, the clamping frame 26 and the magnetic mounting frame 29 are connected via the reinforcing bar 46, and the strength of the cutting machine 21 is increased.

[0029] As shown in FIG. 3, the second movement guide rails 30 are provided across the front and rear magnetic mounting frame 29, and as shown in FIG. 3, a pair of second movement guide rails 30 are provided on the upper and lower sides.

[0030] 3, the second movement guide rail 30 is provided with a guide holder stopper pin 45. When the guide holder stopper pin 45 is inserted, it comes into contact with the guide holder 31 and acts as a blocking member, thereby stopping the movement of the mounting substrate 34 connected to the guide holder 31. Although not shown, the guide holder stopper pin 45 may of course be provided on the first movement guide rail 27.

[0031] 1, 2, and 4, the guide holders 31 are provided so as to be able to move in a sliding state by sandwiching the first movement guide rail 27 from above and below. The first movement guide rails 27 are provided in pairs, one on the upper side and one on the lower side (see FIG. 4), and each first movement guide rail 27 is provided with a guide holder 31. Similarly, the guide holder 31 is provided so as to be able to move in a sliding state by sandwiching the second movement guide rail 30 from above and below, as shown in Figures 1, 2 and 3. The second movement guide rail 30 is provided in a pair, one on the upper side and one on the lower side (see Figure 3), and a guide holder 31 is provided on each second movement guide rail 30.

[0032] 1 to 4, the mounting substrate 34 is connected to all of the guide holders 31. That is, the mounting substrate 34 is connected to the guide holders 31 at four locations in total, at the top and bottom on both the left and right sides of the mounting substrate 34, so that the mounting substrate 34 moves smoothly together with the movement of the guide holders 31. As shown in Figure 1, the mounting base plate 34 has a cutting opening 33 at the top of the center, which is formed in a vertically long U-shape. The cutting opening 33 is the portion through which the temporary fixing bracket 24 passes. The cutting opening 33 has vertically formed edges 33a spaced at a predetermined interval, allowing the temporary fixing bracket 24 hanging down from the lower part of the main girder lower flange 22 to be reliably passed through and cut.

[0033] As shown in FIGS. 2 to 4, the drive motor 35 is provided on the mounting substrate 34, and is driven and stopped by an ON / OFF switch 35a.

[0034] The motor pulley 36 is designed to be driven in conjunction with the drive of the drive motor 35, and is mounted on the mounting board 34 as shown in Fig. 1. The motor pulley 36 has a larger diameter than the auxiliary pulley 37, and a band saw 38 that rotates in conjunction with the auxiliary pulley 37 is wound around it.

[0035] A pair of auxiliary pulleys 37 are provided on the mounting base plate 34 opposite the motor pulley 36. That is, the auxiliary pulleys 37 are provided in pairs on the left and right at the two upper corners of the mounting base plate 34, and are arranged so that the band saw 38 is perpendicular to the temporary fixing bracket 24.

[0036] The band saw 38 is a so-called wire-type rotary cutter, and rotates at high speed by being wound around a motor pulley 36 and a pair of auxiliary pulleys 37. The band saw 38 is usually covered with a cover (not shown).

[0037] Specifically, as shown in Figures 2 to 4, the pulling means 39 comprises a pull spring holder 39a, a pull spring 39b, a spring hook 39c, and a pull string 39d. When in use, the pull string 39d is held, the pull spring 39b is pulled, and the spring hook 39c is hooked onto the spring hook shaft 47 and set (see Figures 8 to 10). When the guide holder stopper pin 45 is removed, the tension spring holder 39a winds up the tension spring 39b, and the mounting substrate 34 moves along the first movement guide rail 27 and the second movement guide rail 30. Then, the band saw 38 of the mounting substrate 34 cuts the temporary fixing metal fitting 24 while moving.

[0038] Next, a procedure for cutting the temporary fixing metal fittings 24 of the bearing using the cutting machine 21 configured as above will be described. First, as shown in FIGS. 1 and 5, the stopper pin 41 of the clamp portion 25 is removed, the second bolt 40 is loosened, and the clamp portion frame 26 is rotated so as to tilt. Then, as shown in Figure 6 (a), the clamp portion 25 is abutted against the end portion 22a of the main girder lower flange 22, and then, as shown in Figure 6 (b), the first bolt 32 is screwed in to attach the clamp portion 25 to the end portion 22a of the main girder lower flange 22.

[0039] Next, as shown in Figure 7, the clamp unit frame 26 is rotated to return its tilt (see arrow A) to magnetically attach the magnetic mounting part 28 to the lower part of the main girder lower flange 22. Then, the stopper pin 41 of the clamp unit 25 is inserted and the second bolt 40 is screwed in to maintain the clamp unit frame 26 in a fixed state (see Figure 7). In this way, the cutting machine 21 can be quickly and accurately attached to a position where the temporary fixing metal fitting 24 can be cut.

[0040] Next, as shown in FIG. 8, the pull string 39d is held by hand, the pull spring 39b is pulled, and the spring hook 39c is hooked onto the spring hook shaft 47 and set. As shown in Figures 9 and 10, when the guide holder stopper pin 45 is removed, the tension spring holder 39a winds up the tension spring 39b, and the mounting substrate 34 moves along the first movement guide rail 27 and the second movement guide rail 30. At this time, the cutting opening 33 of the mounting substrate 34 passes through the temporary fixing metal fitting 24 , and the hand saw 38 disposed across the cutting opening 33 cuts the temporary fixing metal fitting 24 . In Figures 5 to 10, a weld bead 48 is formed at the connection between the upper end of the temporary fixing bracket 24 and the main girder lower flange 22 (the part shown in black ink in each figure), and as shown in Figure 9, the hand saw 38 starts cutting from the end 48a of the weld bead 48.

[0041] The cutting machine 21 configured as described above can be quickly and accurately attached to a position where the temporary fixing bracket 24 can cut by rotating and tilting the clamping unit frame 26 relative to the clamping unit 25, attaching the clamping unit 25 to the end 22a of the main girder lower flange 22 with the first bolt 32, and then rotating the clamping unit frame 26 to return it to its original tilt and magnetically attaching the magnetic mounting unit 28 to the bottom of the main girder lower flange 22. In other words, even when working upward under the main girder lower flange 22, the cutting machine 21 can be quickly and reliably attached to the temporary fixing bracket 24 in a position where the cutting opening 33 can pass through without hindrance. [Explanation of symbols]

[0042] 1 cutting machine 2 Mounting part 3 Rail guide support 4 Guide rails for movement 5 Moving roller 6 Cutting opening 7 Mounting board 8 Drive motor 9 Drive roller 10 driven roller 11 Bandsaw 12 Steel columns 13 Projection (object to be cut) 21 Cutting machine 22 Main girder lower flange 22a end 23 Main girder web 24 Temporary fixing bracket for bearing 25 Clamp section 25a Upper piece 25b Lower piece 26 Clamp frame 26a Upper part 26b Lower part 27 First moving guide rail 28 Magnetic mounting part 28a Switch 29 Magnetic mounting frame 29a Upper part 29b Lower part 30 Second moving guide rail 31 Guide holder 32 First Bolt 33 Cutting opening 34 Mounting board 35 Drive motor 35a ON / OFF switch 36 Motor pulley 37 Auxiliary pulley 38 Bandsaw 39 Traction means 39a Pull spring holder 39b Pull spring 39c Spring hook 39d Drawstring 40 Second bolt 41 Stopper pin 42 Third Bolt 43 4th Bolt 44 Long hole 45 Guide holder stopper pin 46 Reinforcement bar 47 Spring Scroll 48 Weld Bead 48a end

Claims

1. A cutting machine for cutting temporary fixing brackets of bearings that are installed in a hanging state at the bottom of the main girder lower flange of a steel bridge, The cutting machine includes a pair of clamps attached to ends of the main girder lower flanges that extend a predetermined length from the main girder web of the steel bridge with first bolts; a clamping portion frame connected to the clamping portion so as to be rotatable about the second bolt; a first movement guide rail provided across the clamp unit frames; a pair of magnetic mounting portions that can be magnetically attached to the lower portion of the main girder lower flange; a magnetic mounting frame connected to the magnetic mounting portion; a second movement guide rail provided across the magnetic attachment frame; a guide holder that is movable along the first movement guide rail and the second movement guide rail; a mounting base plate connected to the guide holder and having a cut opening at the center for passing the temporary fixing metal fitting therethrough; a drive motor provided on the mounting substrate; a motor pulley that is driven in conjunction with the drive of the drive motor and is provided on the mounting substrate; a pair of auxiliary pulleys provided on the mounting base plate opposite the motor pulley; a band saw that is rotated by being entrained around the auxiliary pulley and the motor pulley; and a pulling means provided to pull the mounting substrate along the first guide rail for movement and the second guide rail for movement. A cutting machine characterized by:

2. A reinforcing bar is provided across the clamp frame and the magnetic mounting frame.

2. The cutting machine according to claim 1,

3. The clamp unit is provided with a stopper pin for stopping the rotation of the clamp unit frame, and the second bolt for maintaining the fixed state between the clamp unit and the clamp unit frame.

2. The cutting machine according to claim 1,

4. The first movement guide rail and / or the second movement guide rail are provided with a guide holder stopper pin that stops the movement of the guide holder.

2. The cutting machine according to claim 1,

5. The traction means is a winding band spring.

2. The cutting machine according to claim 1,

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