Weld residue removal apparatus for surface of laid iron plate

Abstract

To provide an apparatus capable of mechanically removing a weld residue remaining welded on a surface of a laid iron plate, without depending on the skill of a worker.SOLUTION: A weld residue removal apparatus comprises, in an apparatus main body 1, a pressing die 2 that comes into contact with an edge of a weld residue remaining welded on a laid iron plate A, an actuator that advances the pressing die 2 from an inner side of the laid iron plate A toward an outer side of the laid iron plate, or from the outer side toward the inner side, and applies a pressing force to break or shear a welded portion between the weld residue B and the surface of the laid iron plate A, and a reaction force receiving part 4 that receives a reaction force when the pressing die 2 presses the edge of the weld residue B.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] This invention relates to a device that can mechanically remove welding residues from anti-slip plates that remain welded to the surface of returned steel plates when they are reused after being returned to a leasing company for construction materials, etc., without relying on the skill of the worker. [Background technology]

[0002] At construction sites, etc., steel plates of a certain width and length are laid one by one on the ground surface to create temporary roads, temporary material storage areas, and to protect already constructed floor surfaces.

[0003] The ground at construction sites and other locations is often uneven, which can cause steps to form at the edges of adjacent steel plates that have been laid down, obstructing the passage of workers or causing the steel plates to shift and jump up when construction machinery passes over them.

[0004] For this reason, at construction sites, after the steel plates are laid, anti-slip plates are welded to the edges of adjacent steel plates to prevent the edges of the laid steel plates from bouncing up or shifting out of position.

[0005] Incidentally, steel sheets are often delivered to a construction site or the like by a construction material leasing company or the like, and are returned from the construction site to the leasing company or the like after the construction work is completed.

[0006] When removing steel plates that have been laid at a construction site, the anti-slip plates that connect the edges of adjacent steel plates are cut using gas cutting or the like to separate the steel plates one by one, and the plates are then returned to the leasing company or the like.

[0007] The steel plates returned to the leasing company or the like are reused after removing any dirt from the surface and correcting any deformations.

[0008] Conventionally, cleaning devices for reusing steel plates returned to leasing companies or the like are disclosed in, for example, Patent Document 1 or Patent Document 2.

[0009] Furthermore, when the steel plate is deformed, there is a device for correcting the deformation as disclosed in Patent Document 3, and the steel plate is reused after the deformation is corrected. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-80783 [Patent Document 2] Japanese Patent Publication No. 2020-157212 [Patent Document 3] Japanese Patent Application Publication No. 2023-5019 Summary of the Invention [Problem to be solved by the invention]

[0011] However, when the steel plates are returned to the leasing company or the like, the cut-off anti-slip plates are often left as weld residue on the edges of the steel plates, in a welded state.

[0012] This welding residue is a square with sides of 50 to 100 mm and a thickness of 6 to 12 mm, with weld beads remaining on three sides excluding the cut edge, and is attached in an average of six places around the edge of the steel plate.For this reason, when reusing the steel plate, the welding residue needs to be removed from the surface of the steel plate.

[0013] Conventionally, the removal of welding residues remaining on the surface of the steel sheet is carried out manually by workers of the steel sheet leasing company using gas cutting, plasma cutting, gouging, or a disc grinder.

[0014] However, in order to quickly remove the welding residue left on the surface of the steel sheet, skilled techniques are required, and if performed by an inexperienced person, the finished product will be poor, and additional finishing work using a grinder will be required, lengthening the processing time.

[0015] Furthermore, due to the recent labor shortage, skilled workers are not being able to adequately pass on their skills, and the shortage of skilled workers is becoming a more serious problem.

[0016] For this reason, an alternative method that does not depend on the skill of the operator is required.

[0017] Therefore, the present invention aims to provide a device that can mechanically remove welding residues that remain welded on the surface of steel plates without relying on the skill of the worker. [Means for solving the problem]

[0018] The device for removing welding residue from the surface of a steel sheet according to the present invention, which solves the above-mentioned problems, comprises a main body of the device, a press die that abuts against the edge of the welding residue that remains welded to the surface of the steel sheet, an actuator that advances the press die from the inside to the outside of the steel sheet, applying a pressing force that breaks or shears the welded area between the welding residue and the surface of the steel sheet, and a reaction force receiving section that absorbs the reaction force when the press die presses.

[0019] In addition, the device for removing welding residue from the surface of a steel sheet according to the present invention comprises, in the device body, a press die that is brought into contact with the edge of the welding residue that remains on the steel sheet while still welded to it, an actuator that advances the press die from the outside to the inside of the steel sheet, applying a pressing force that breaks or shears the welded area between the welding residue and the surface of the steel sheet, and a reaction force receiving section that absorbs the reaction force when the press die presses against the edge of the welding residue.

[0020] The device body may be provided so as to be movable on the surface of the iron plate, or may be suspended from a carriage which is movable along the periphery of the iron plate.

[0021] The pressing surface of the die against the welding residue may be provided with a cutting edge having a rake face that bites into the welding portion between the welding residue and the surface of the sole plate. [Effects of the Invention]

[0022] According to the device for removing welding residue from the surface of a steel sheet of this invention, the device body is installed at the position of the welding residue remaining on the surface of the steel sheet so that the press die abuts the edge of the welding residue, and the actuator of the device body is used to advance the press die from the inside to the outside of the steel sheet, or from the outside to the inside of the steel sheet, thereby applying a pressing force that breaks or shears the welded area between the welding residue and the surface of the steel sheet, thereby easily removing the welding residue from the steel sheet mechanically without relying on the skill of the worker. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is an overall side view showing a state in which an operator moves a welding residue removal device according to a first embodiment of the present invention to the position of welding residue to be removed. [Figure 2] 2 is an enlarged side view of the welding residue removal device of FIG. 1. [Figure 3] 2 is an overall plan view showing the welding residue removal device of FIG. 1 installed at the position of the welding residue to be removed by an operator. FIG. [Figure 4] 2 is a side view showing the state in which the handle lever of the welding residue removal device of FIG. 1 is lowered and the device body is installed at the position of the object to be removed. FIG. [Figure 5] FIG. 5 is a plan view of the state of FIG. 4. [Figure 6] 1 is a partial cutaway side view showing the state immediately before the removal work begins after the main body of the welding residue removal device in FIG. 1 has been installed at the location of the object to be removed; FIG. 1 (b) is a partial cutaway side view showing the state midway through the removal work beginning after the main body of the welding residue removal device in FIG. 1 has been installed at the location of the object to be removed; and FIG. 1 (c) is a partial cutaway side view showing the state after the removal work has been completed after the main body of the welding residue removal device in FIG. 1 has been installed at the location of the object to be removed. [Figure 7] (a) is a partial plan view showing the installation position of the device body when using the welding residue removal device of Figure 1 to remove objects located at the corners of steel plates, and (b) is a partial side view with a part of (a) cut away. [Figure 8] 1 is a side view showing an example of a stamping die used in the welding residue removal device of the present invention. FIG. [Figure 9] 1(a) and 1(b) are side views showing an example of a stamping die used in the welding residue removal device of the present invention. [Figure 10] 1 is a side view showing an example of a stamping die used in the welding residue removal device of the present invention. FIG. [Figure 11] 1A is a plan view showing an example of a stamping die used in the welding residue removal device of the present invention, and FIG. 1B is a side view thereof. [Figure 12] 1A is a plan view showing an example of a stamping die used in the welding residue removal device of the present invention, and FIG. 1B is a side view thereof. [Figure 13] 1A is a plan view showing an example of a stamping die used in a welding residue removal device of the present invention, and FIG. 1B is a cross-sectional view taken along line AA of FIG. 1A. [Figure 14] 1A is a plan view showing an example of a stamping die used in a welding residue removal device of the present invention, and FIG. 1B is a cross-sectional view taken along line AA of FIG. 1A. [Figure 15] 1A is a plan view showing an example of a stamping die used in a welding residue removal device of the present invention, and FIG. 1B is a cross-sectional view taken along line AA of FIG. 1A. [Figure 16] 1A is a plan view showing an example of a stamping die used in a welding residue removal device of the present invention, and FIG. 1B is a cross-sectional view taken along line AA of FIG. 1A. [Figure 17] 1A is a plan view showing an example of a stamping die used in a welding residue removal device of the present invention, and FIG. 1B is a cross-sectional view taken along line AA of FIG. 1A. [Figure 18] FIG. 10 is a plan view showing a state in which a main body of a welding residue removal apparatus according to a second embodiment of the present invention has been installed at the position of an object to be removed and removal work has not yet begun. [Figure 19]19 is a plan view showing a state in which removal work is being started using the welding residue removal device of FIG. 18. FIG. [Figure 20] 19 is a plan view showing a state in which the stamping die of the device body has been returned to the removal start position after one side of the object to be removed has been cut using the welding residue removal device of FIG. 18. FIG. [Figure 21] FIG. 19 is a side view of the welding residue removal device of FIG. 18. [Figure 22] 19 is a side view, partially cut away, of the weld residue removal device of FIG. 18. [Figure 23] FIG. 19 is a front view of the welding residue removal device of FIG. 18. [Figure 24] 19 is a rear view showing the relationship between the device body and the actuator of the welding residue removal device of FIG. 18. FIG. [Figure 25] 19 is a side view showing the state in which the handle of the welding residue removal device of FIG. 18 is slightly lifted to rotate the device body or move it left and right. FIG. [Figure 26] FIG. 26 is a front view of the state shown in FIG. 25. [Figure 27] 26 is a front view showing a state in which the device body is tilted from the state in FIG. 25 and moved left and right. FIG. [Figure 28] 26 is a side view showing a state in which the handle is further lifted from the state in FIG. 25 to move the device main body back and forth. FIG. [Figure 29] FIG. 29 is a front view of the state shown in FIG. 28. [Figure 30] This is a plan view showing the state in which, after cutting one side of the object to be removed using the welding residue removal device of Figure 18, the device body has been changed in orientation and installed at the position of the object to be removed in order to cut the other two sides. [Figure 31] 31 is a plan view showing a state in which the other two sides of the removal object are cut by operating the pressing die from the state shown in FIG. 30. FIG. [Figure 32] FIG. 10 is a plan view showing a state in which an operator moves a welding residue removal device according to a third embodiment of the present invention to the position of an object to be removed. [Figure 33] 33 is a plan view showing a state before the start of removal work after the main body of the welding residue removal apparatus of FIG. 32 is installed at the position of the object to be removed. FIG. [Figure 34] FIG. 34 is a plan view showing a state in which the mold has been pushed forward from the state shown in FIG. 33 to a position where removal of the removal object is completed. [Figure 35] FIG. 34 is a side view showing the state of FIG. 33 with some parts omitted. [Figure 36] FIG. 36 is a side view showing the state in which the pressing die has been pushed forward from the state in FIG. 35. [Figure 37] FIG. 33 is a side view of the welding residue removal device of FIG. 32. [Figure 38] FIG. 10 is a plan view showing a state in which a welding residue removal device according to a fourth embodiment of the present invention is installed at the position of an object to be removed. [Figure 39] FIG. 39 is a plan view showing a state in which the mold has been pushed forward from the state shown in FIG. 38 to a position where removal of the removal object is completed. [Figure 40] FIG. 39 is a side view showing the state of FIG. 38 with some parts omitted. [Figure 41] FIG. 40 is a side view showing the state of FIG. 39 with some parts omitted. [Figure 42] FIG. 39 is a rear view of the removal device of FIG. 38. [Figure 43] FIG. 10 is a plan view showing a state in which a welding residue removal device according to a fifth embodiment of the present invention is installed at the position of an object to be removed. [Figure 44] FIG. 44 is a side view of FIG. 43. [Figure 45] FIG. 44 is a plan view showing a state in which the mold has been pushed forward from the state shown in FIG. 43 to a position where removal of the removal object is completed. [Figure 46] FIG. 46 is a side view of FIG. 45. [Figure 47] FIG. 10 is a plan view showing a state in which a welding residue removal device according to a sixth embodiment of the present invention is installed at the position of an object to be removed. [Figure 48] FIG. 48 is a plan view showing a state in which the mold has been pushed forward from the state shown in FIG. 47 to a position where removal of the removal object is completed. [Figure 49] FIG. 10 is a plan view showing a state in which a welding residue removal device according to a seventh embodiment of the present invention is installed at the position of an object to be removed. [Figure 50] FIG. 50 is an enlarged plan view of the welding residue removal device of FIG. 49. [Figure 51] FIG. 51 is a side view of FIG. 50. [Figure 52] FIG. 52 is an enlarged plan view showing a state in which the mold has been pushed forward from the state in FIG. 51 to a position where removal of the removal object is completed. DETAILED DESCRIPTION OF THE INVENTION

[0024] Next, an embodiment of a welding residue removal device according to the present invention will be described with reference to the drawings.

[0025] When steel plates A are laid out at a construction site or the like, the edges of adjacent steel plates A are connected by welding anti-slip plates to prevent the edges of the steel plates A from bouncing up or shifting out of position.

[0026] Steel plate A is recovered after construction is completed and made available for reuse. To recover steel plate A that has been laid out at a construction site, the anti-slip plates that connect the edges of adjacent steel plates A are cut using gas cutting or the like, and the steel plates A are separated and recovered one by one. This leaves multiple rectangular anti-slip plates as welding residue B at the edges and corners of the recovered steel plate A, as shown in Figure 3.

[0027] The welding residue removal device according to the present invention is a device for removing welding residue B remaining on the surface of a steel sheet A recovered from a construction site or the like in order to reuse the steel sheet A.

[0028] First, FIGS. 1 to 7 show a first embodiment of a welding residue removal device according to the present invention.

[0029] The welding residue removal device of this first embodiment comprises an apparatus main body 1, a press 2 that is brought into contact with the edge of welding residue B that remains welded to the surface of steel plate A, an actuator 3 that advances the press 2 from the inside to the outside of the steel plate A, applying a pressing force to break or shear the welded point between the welding residue B and the surface of the steel plate A, and a reaction force receiving part 4 that is brought into contact with the edge of the steel plate A and absorbs the reaction force when the press 2 presses.

[0030] In the following description, the direction in which the die 2 advances will be referred to as "front" or "forward," and the direction in which the die 2 returns will be referred to as "rear" or "backward."

[0031] The device main body 1 is mounted on a carriage 10 that can move on a steel plate A, and as shown in Figure 1, a worker X pushes the carriage 10, allowing it to move on the steel plate A to the position of the welding residue B to be removed.

[0032] In this first embodiment, a hook-shaped reaction force receiving portion 4 that abuts against the edge of the insole steel plate A is provided at a lower front position of the device main body 1, and the reaction force is absorbed by abutting this reaction force receiving portion 4 against the edge of the insole steel plate A. For this reason, in the first embodiment, it is necessary to place the insole steel plate A on a low pedestal C to leave a gap around the periphery of the insole steel plate A large enough to hook the hook-shaped reaction force receiving portion 4. In this way, although a low pedestal C is used in the first embodiment, there is no need to place the insole steel plate A at a high position as in the other embodiments described later, and therefore the first embodiment is an embodiment that is good at using space in the work area.

[0033] The device main body 1 is equipped with a pair of side frames 5 that guide the die 2 straight toward the welding residue B to be removed. The pair of side frames 5 consists of a rear frame 5a that is positioned inside the steel plate A during removal work, and a front frame 5b that is positioned almost outside the edge of the steel plate A, and they face each other at a distance wider than the left-right width of the welding residue B to be removed, and the hook-shaped reaction force receiving portion 4 is provided below and in front of the front frame 5b.

[0034] The die 2 is composed of a square block-shaped die body 2a and a cutting edge 2b provided on the front surface of the die body 2a. The cutting edge 2b has a rake face that bites into the welded area between the welding residue B and the surface of the steel sheet A.

[0035] In this first embodiment, a hydraulic cylinder is used as the actuator 3 for advancing the die 2 towards the weld residue B.

[0036] This hydraulic cylinder has a piston rod 3a and a cylinder tube 3b, and moves the press die 2 forward from the inside of the iron plate A to the outside.

[0037] A mounting frame 6 for mounting the cylinder tube 3b is bridged across the rear frame 5a of the pair of side frames 5, and the cylinder tube 3b is fixed to this mounting frame 6 with the piston rod 3a facing forward.

[0038] A reinforcing frame 7 is bridged in front of the front frame 5b constituting the pair of side frames 5.

[0039] An upper surface guide 8 and a lower surface guide 9 are provided across the upper and lower surfaces of the rear frame 5a of the pair of side frames 5, and serve as guides for guiding the die body 2a in a straight line.

[0040] The device main body 1 is placed on a carriage 10 that can move on a steel plate A, and a worker X pushes the carriage 10 to the position of the welding residue B to be removed around the steel plate A.

[0041] The cart 10 that moves the device main body 1 is equipped with a loading platform 12 with casters 11 installed on the underside, and a hydraulic pump 13 is placed on this loading platform 12. This hydraulic pump 13 and the cylinder tube 3b of the hydraulic cylinder are connected by a hydraulic hose 14, and hydraulic oil is supplied to the cylinder tube 3b via the hydraulic hose 14.

[0042] The front end of the loading platform 12 of the dolly 10 is fixed to the upper surface of the rear frame 5a. A shaft member 15 is installed on the upper front surface of the loading platform 12 so as to cross the upper rear surface of the rear frame 5a, and the front lower ends of a pair of left and right handle shafts 16 extending obliquely upward and rearward are rotatably supported on both left and right ends of this shaft member 15.

[0043] The front lower ends of the pair of left and right handle shafts 16 extend further diagonally downward toward the front of the shaft member 15, and wheels 20 located on both outer surfaces of the left and right rear frames 5a are rotatably attached to the lower ends.

[0044] A handle 21 is provided at the rear upper end of a pair of left and right handle shafts 16, and when this handle 21 is pulled upward, the device main body 1 is raised from the ground surface, as shown in Figures 1 and 2, around the contact points of the wheels 20 located below and sandwiching the shaft member 15.In this state, the device main body 1 can be moved back and forth and left and right using the casters 11 and wheels 20 of the loading platform 12.

[0045] A position lock mechanism is provided between the handle shafts 16 and the device body 1 to fix the positions of the pair of left and right handle shafts 16 while the device body 1 is lifted off the ground surface.

[0046] This position locking mechanism prevents the handle shaft 16 from rotating around the shaft member 15 by inserting the tip of a lock rod 22 provided along the handle shaft 16 into a lock hole of a lock member 23 provided on the loading platform 12 while the device main body 1 is raised above the ground. Conversely, when a release lever 24 provided at the rear end of the lock rod 22 is gripped, the tip of the lock rod 22 comes out of the lock hole of the lock member 23, releasing the lock.

[0047] With this position locking mechanism unlocked, pushing down the handle 21 at the rear end of the handle shaft 16 raises the relative position of the wheel 20 to the device body 1, and as shown in Figure 4, the rear frame 5a of the device body 1 lowers so that it comes into contact with the iron plate A.

[0048] The pair of left and right handle shafts 16 are biased by a spring mechanism 25 provided between the rear position of the shaft member 15 and the rear frame 5a of the device body 1 so that the handle 21 side is pushed upward, reducing the force required when the worker X pulls the handle 21 upward to lift the device body 1 off the ground surface.

[0049] The procedure for removing the welding residue B around the steel plate A using the welding residue removal device according to the first embodiment configured as above will be described below.

[0050] First, as shown in FIG. 3, the removal procedure will be described when the welding residue B to be removed is located on the edge of one side of the steel plate A.

[0051] As shown in Figure 1, worker X pushes cart 10 while lifting device main body 1 off steel plate A, and moves device main body 1 perpendicular to one side of steel plate A, so that welding residue B to be removed is positioned between a pair of side frames 5 of device main body 1, and further so that hook-shaped reaction force receiving portion 4 at the lower front end of device main body 1 hooks onto one side of steel plate A.

[0052] In this position, worker X grasps release lever 24 attached to the rear end of locking rod 22 to unlock handle shaft 16, and in this state pushes down handle 21 at the rear end of handle shaft 16, causing wheel 20 to rise relative to device body 1, and as shown in Figure 4, device body 1 descends, causing hook-shaped reaction force receiving portion 4 at the front end to hook onto one side of steel plate A, and device body 1 is installed relative to steel plate A so that mold 2 abuts against the rear edge of welding residue B to be removed.

[0053] In this state, hydraulic oil is supplied from hydraulic pump 13 to cylinder tube 3b of the hydraulic cylinder via hydraulic hose 14, and piston rod 3a is extended, pressing die 2 at the tip of piston rod 3a against weld residue B, gradually breaking or shearing the weld between weld residue B and the surface of sole plate A, as shown in Figure 6(b). When die 2 is moved forward further, weld residue B is pulled away from the surface of sole plate A, as shown in Figure 6(c).

[0054] Next, when using the welding residue removal device according to the first embodiment to remove welding residue B located at the corners of a steel plate A among the welding residues B around the steel plate A, as shown in FIG. 7( a), the side frame 5 of the device main body 1 is positioned diagonally relative to the corners of the steel plate A, and the device main body 1 is positioned relative to the steel plate A so that the press dies 2 abut against the corners of the welding residue B. When the device main body 1 is positioned diagonally relative to the steel plate A in this manner, a gap is formed between the reaction force receiving portion 4 at the front end of the device main body 1 and two sides of the corners of the steel plate A. Therefore, when removing welding residue B located at the corners, a spacer 26 is used to fill the gap between the reaction force receiving portion 4 and two sides of the corners of the steel plate A.

[0055] Incidentally, the cutting edge 2b of the pressing die 2 comes into contact with the welding residue B with great force during the removal operation, and therefore the contact surface of the cutting edge 2b against the welding residue B is subject to severe wear.

[0056] For this reason, it is preferable that the pressing die 2 be divided into a pressing die body 2a and a cutting edge portion 2b as shown in FIG. 8, with the cutting edge portion 2b being replaceable.

[0057] Furthermore, the shape of the cutting edge portion 2b of the pressing die 2 may be either a gradient type in which the contact surface has a gradient, as shown in Figures 9(a) and (b), or a flat type in which the contact surface does not have a gradient, as shown in Figure 10.

[0058] The sloped cutting edge 2b, which has a sloped contact surface, cuts into the welded portion of the weld residue B, allowing the welded portion to be cut gradually from the cut position, and removal work can be performed with less thrust than with a flat type. In addition, the sloped cutting edge 2b makes it difficult for the mold 2 to escape upward, and the cut surface is finished so cleanly that finishing work with a grinder or the like is not necessary, making it possible to reduce the removal work process.

[0059] On the other hand, the flat cutting edge 2b is stronger than the sloped type, and therefore can apply a larger thrust. Also, because the flat cutting edge 2b does not cut into the welded portion of the weld residue B, it is possible to transmit the shear force to the entire weld residue B, and it is possible to break the welded portion in one go with a short stroke, which has the advantage of fast working speed, but the condition of the fractured surface is not stable, and there are cases where the broken material remaining on the surface of the steel plate A must be finished with a grinder.

[0060] Furthermore, the slope of the sloped cutting edge 2b can be either an acute angle or an obtuse angle, as shown in Figure 9(a).The more acute the angle, the greater the component force that bends the weld residue B upward, cutting into the weld and advancing, making it easier to cut and reducing the required thrust. However, the more acute the angle, the more likely the tapered tip is to break, so blade breakage can be reduced by making only the tip obtuse, or by making only the tip round as shown in Figure 9(b).

[0061] Moreover, various patterns such as those shown in Figs. 11 to 17 can be selected as the shape of the inclined cutting edge 2b.

[0062] 11(a) and 11(b) show an example in which the planar shape of the inclined cutting edge 2b is changed to a straight type, which is easy to process and can be provided at low cost.

[0063] 12(a) and 12(b) show examples in which the planar shape of the inclined cutting edge 2b is a single-edged type, which has the advantage of being able to cut from one side and reduce the cutting load.

[0064] 13(a) and 13(b) show examples in which the planar shape of the sloped cutting edge 2b is a concave obtuse angle type, which has the advantage of being able to cut gradually from both sides and reduce the cutting load.

[0065] Figures 14(a) and (b) show examples in which the planar shape of the sloped cutting edge portion 2b is a concave acute-angled type with a sharper cutting edge than that of Figures 13(a) and (b). This makes it easier to cut from both sides than Figures 13(a) and (b), but requires a longer operating stroke due to the longer acute-angled cutting edge.

[0066] Figures 15(a) and (b) show an example in which the planar shape of the sloped cutting edge 2b is a concave R-shape, which has the advantage that it can cut gradually from both sides, reducing the cutting load, and there are no corners on the plane, making the blade less likely to chip.

[0067] 16(a) and 16(b) show examples in which the planar shape of the inclined cutting edge 2b is made convex in the center, which allows for gradual cutting from the center and reduces the cutting load.

[0068] Figures 17(a) and (b) show an example in which the planar shape of the sloped cutting edge 2b has a convex R-shape in the center, which allows for gradual cutting from the center, reducing the cutting load, and has the advantage that the blade is less likely to chip because there are no bends in the sloped surface or corners on the plane.

[0069] Next, FIGS. 18 to 31 show a second embodiment of the welding residue removal device according to the present invention.

[0070] This second embodiment comprises an apparatus main body 31, a press 32 that is brought into contact with the edge of the welding residue B that remains welded on the steel plate A, an actuator 33 that advances the press 32 from the outside to the inside of the steel plate A, applying a pressing force to break or shear the welded point between the welding residue B and the surface of the steel plate A, and a reaction force receiving part 34 that is brought into contact with the edge of the welding residue B diagonally opposite the edge of the welding residue B that the press 32 is coming into contact with, and receives the reaction force when the press 32 presses against the edge of the welding residue B.

[0071] This second embodiment is similar to the first embodiment in that it uses a hydraulic cylinder as the actuator 33, but differs from the first embodiment in that the actuator 33 is positioned on the outside of the steel plate A so that the press die 32 abuts against the welding residue B diagonally from the outside of the steel plate A, and the reaction force is not taken by the steel plate A, but by the edge of the welding residue B at the diagonal position opposite the one where the press die 32 abuts.

[0072] In the second embodiment, by cutting diagonally into the weld residue B, which has weld beads remaining on three sides of a rectangle, it is possible to remove the weld beads on the three sides of the weld residue B one by one. Therefore, the width that is cut at one time is small, and the thrust of the hydraulic cylinder that constitutes the actuator 33 can be reduced.

[0073] Furthermore, by placing the actuator 33 on the outside of the insole steel plate A, the center height (point of force) of the hydraulic cylinder that constitutes the actuator 33 can be brought closer to the height (point of action) of the cutting surface, as shown in Figure 24. This makes it possible to suppress loss of thrust and also shorten the guide length of the pressing die 32.

[0074] By reducing the required thrust of the hydraulic cylinder that constitutes the actuator 33, the capacity of the hydraulic cylinder and hydraulic power source can be reduced, and the size of each strength member can be reduced, so the entire device can be made small and lightweight, making it easier to handle.

[0075] It is preferable that the die 32 be moved along the surface of the steel plate A so that the welding residue B is not left uncut or does not bite into the steel plate A.In the second embodiment, in which a hydraulic cylinder serving as an actuator 33 is placed on the outside of the steel plate A, the interference between the steel plate A and the device main body 31 can be reduced more than in the first embodiment, so that even if the steel plate A is bent or warped, the welding residue B can be easily cut along the surface of the steel plate A.

[0076] The device body 31 in the second embodiment is provided with a pair of side frames 35 that face each other at a distance wider than the diagonal width of the rectangular welding residue B to be removed and that linearly guide a rectangular block-shaped stamping die 32 attached to the tip of the piston rod 33b of the hydraulic cylinder forward.

[0077] The pair of side frames 35 includes a rear frame 36 at the rear that secures the cylinder tube 33a and a front frame 37 at the front. The rear surface of the front frame 37 is provided with a support die 38 that abuts against the edge of the weld residue B as a reaction force receiving portion 34. This allows the edge of the weld residue B to absorb the reaction force when the pressing die 32 is pressed against the weld residue B. The support die 38 preferably has a sloped rake surface on the surface that abuts against the edge of the weld residue B. When the support die 38 absorbs the reaction force at the edge of the weld residue B, the rake surface allows the support die 38 to cut into the welded portion at the edge of the weld residue B. This prevents the support die 38 from sliding upward along the surface of the welded portion at the edge of the weld residue B, ensuring that the reaction force is absorbed reliably. In this way, by providing different angles on the sloped surfaces of the support die 38 and the pressing die 32, it is possible to configure the support die 38 so that the acute-angle side is preferentially cut into. It is also possible to configure the receiving die 38 and the pressing die 32 so that the angles of their inclined surfaces are the same, so that they can cut from both sides.

[0078] The front ends of U-shaped handlebars 39 extending rearward are attached to both left and right ends of the rear frame 36.

[0079] 25, in order to turn the side frames 35 or move them left and right with the handlebars 39 slightly raised and the side frames 35 tilted, left and right moving wheels 40 are attached to the center of the front frame 37 so that their axles are aligned with the front and rear directions of the side frames 35. In addition, left and right auxiliary wheels 41, each with a smaller wheel diameter than the left and right moving wheels 40, are attached to the left and right of the left and right moving wheels 40.

[0080] By making the diameter of the left and right moving wheels 40 larger than that of the left and right auxiliary wheels 41, the left and right moving wheels 40 come into contact at a point, as shown in Fig. 26, allowing the side frame 35 to turn. In addition, by slightly lifting the handlebar 39 as shown in Fig. 25 and tilting the side frame 35 as shown in Fig. 27, the left and right moving wheels 40 and one of the left and right auxiliary wheels 41 come into contact with the iron plate A, allowing the side frame 35 to move left and right with the iron plate A.

[0081] At both left and right ends of the front of the front frame 37, the axles are aligned with the direction of the front frame 37, and when the side frames 35 are installed on the steel plate A, as shown in Figure 26, forward / backward movable wheels 42 are attached in a state where they are raised above the steel plate A, and as shown in Figure 28, when the handle bar 39 is further lifted, the forward / backward movable wheels 42 come into contact with the steel plate A, and in this state, the worker X can hold the handle bar 39 and push it forward or backward, thereby moving the side frame 35 forward or backward.

[0082] 18 to 20, in the second embodiment, actuators 33 are arranged on the outside of insulator plate A so that die 32 cuts diagonally into weld residue B, which has weld beads remaining on three sides of a rectangle, and the weld beads on the three sides of weld residue B are removed one by one. Therefore, to prevent the installation angle of side frame 35 relative to insulator plate A from changing when die 32 is pressed in diagonally, flange portions 35a with pin insertion holes 35b arranged at equal intervals in the front-to-rear direction are provided on the outside of the pair of side frames 35, and pin insertion holes 35b on these flange portions 35a located at the edge of insulator plate A are selected and anti-rotation pins 35c are inserted into these pin insertion holes 35b, thereby preventing rotation of side frame 35.

[0083] As shown in Figure 18, the installation angle of the side frame 35 relative to the steel plate A is positioned, and the side frame 35 is prevented from rotating by inserting the anti-rotation pin 35c into the pin insertion hole 35b.Then, as shown in Figure 19, the press mold 32 is pushed in diagonally to remove one side of the weld bead on each of the three sides of the welding residue B, and then the press mold 32 is pulled back as shown in Figure 20.

[0084] After this, as shown by the arrow in Figure 30, the installation angle of the side frame 35 relative to the steel plate A is changed, and then the mold 32 is pushed all the way in as shown in Figure 31, whereby the weld beads on the remaining two sides can be removed one by one.

[0085] As described above, the second embodiment can cut into the weld residue B from diagonal directions, so the weld bead can be removed one side at a time. This reduces the width of the cut at one time, and reduces the required cylinder thrust.

[0086] In addition, the center height (point of force) of the hydraulic cylinder can be brought closer to the height of the cutting surface (point of action), which reduces thrust loss and allows the guide length to be shortened. By reducing the required thrust, the capacity of the hydraulic cylinder and hydraulic source can be reduced, allowing the size of each strength member to be reduced.

[0087] Therefore, the device main body 31 can be made smaller and lighter than in the first embodiment, and the second embodiment is easier to handle.

[0088] In addition, it is preferable that the cutting surface of the mold 32 follows the surface of the iron plate A so that no cutting remains or the mold 32 digs into the iron plate body. However, compared to the first embodiment in which the entire device is placed on the iron plate A, the device body 31 of the second embodiment is small and light, and part of the device body 31 is installed on the outside of the iron plate A, so there is less interference with the iron plate A, and it is easy to cut along the surface of the iron plate A even if the iron plate A is curved or has a warped edge.

[0089] Next, a welding residue removal device according to a third embodiment of the present invention will be described with reference to FIGS.

[0090] The third embodiment is an apparatus for carrying out removal work by placing a steel plate A on a platform D at about waist height of a worker X, and the main body 51 of the apparatus is suspended and supported on a cart 50 that can be pushed and moved by the worker X by hand along the periphery of the steel plate A.

[0091] The device body 51 comprises a main body frame 53 having a press die 52 that is brought into contact with the edge of the welding residue B, and while suspended and supported by a cart 50, the main body frame 53 together with the press die 52 is advanced from the inside to the outside of the steel sheet A, thereby breaking or shearing the welded portion between the welding residue B and the surface of the steel sheet A.

[0092] The main frame 53 is provided with a hydraulic cylinder as an actuator 54 that presses the edge of the iron plate A from the outside of the iron plate A to move the main frame 53 forward from the inside to the outside of the iron plate A.

[0093] In the welding residue removal device of the third embodiment, the device body 51 is suspended and supported on the carriage 50, so there is no need to move the device body 51 by suspending it with a crane or the like, which improves workability.

[0094] The carriage 50 has a support pillar 55 at one end that extends above the steel plate A placed on the base D, and an arm 56 that extends toward the other end of the carriage 50 is installed on the top of this support pillar 55 so that it can rotate about a pivot 57, and the main frame 53 is suspended and supported below the other end of this arm 56 via a suspension bracket 58.

[0095] As shown in Figure 32, when removing welding residue B located on the edge of steel plate A, the cart 50 is aligned parallel to one side of steel plate A, and the main frame 53 is rotated relative to the arm 56 so that it is perpendicular to one side of steel plate A.

[0096] The hanging bracket 58 comprises a horizontal plate 58a parallel to the top surface of the main frame 53 and vertical plates 58b extending from both ends of the horizontal plate 58a to below both sides of the main frame 53, with the horizontal plate 58a supported rotatably relative to the arm 56 and the vertical plates 58b supported rotatably relative to the main frame 53.

[0097] The main frame 53 has a pair of side frames 53a facing each other at a distance wider than the width of the welding residue B to be removed, and the lower end of the vertical plate 58b of the hanging bracket 58 is rotatably connected to the outer surface of these side frames 53a.

[0098] As shown in Figures 33 and 34, the pair of side frames 53a are provided with a die mounting frame 53b at the rear position, and a die 52 that abuts against the edge of the welding residue B is fixed to this die mounting frame 53b.

[0099] As shown in Figure 35, the side surfaces of the pair of side frames 53a have a wide portion 53aa that extends forward beyond the edge of the steel sheet A when the mold 52 is positioned behind the edge of the welding residue B, and a protruding portion 53ab that protrudes below this wide portion 53aa and protrudes onto the underside of the edge of the steel sheet A.

[0100] A guide frame 59 is installed between the wide portions 53aa extending forward beyond the edge of the steel sheet A so that it can slide relative to the pair of side frames 53a, and a receiving mold 60 that abuts against the edge of the steel sheet A is installed between the rear surface of this guide frame 59 and the edge of the steel sheet A, and this receiving mold 60 serves as a part that receives the reaction force generated when the pressing mold 52 presses the welding residue B.

[0101] A flat U-shaped cylinder fixing frame 53c is installed at the front position of the pair of side frames 53a, and a cylinder tube 54a of a hydraulic cylinder serving as an actuator 54 is fixed to this cylinder fixing frame 53c with its piston rod 54b facing rearward.

[0102] The tip of the piston rod 54b is joined to the front surface of the guide frame 59, and when the piston rod 54b is extended, the receiving die 60 abuts against the edge of the steel sheet A, and as shown in Figures 34 and 36, the pressing die 52 moves forward together with the main frame 53 due to the pivoting movement of the arm 56, and the pressing die 52 bites into the edge of the welding residue B, thereby removing the welding residue B.

[0103] The reaction force generated when the pressing die 52 fixed to the main frame 53 bites into the edge of the welding residue B is received by the receiving die 60 that abuts against the edge of the sole plate A.

[0104] The carriage 50 is provided with a hydraulic pump 62 that supplies hydraulic oil to the cylinder tube 54 a of the hydraulic cylinder via a hydraulic hose 61 .

[0105] As shown in Figure 37, a spring-type balancer 64 is installed between the lower position of the support pillar 55 of the cart 50 and the center position of the arm 56, and this balancer 64 supports the main frame 53 so that it can be raised and lowered up and down relative to the arm 56, allowing the worker X to set the main frame 53 in the specified location on the iron plate A without using a strong force.

[0106] An example of a procedure for removing the welding residue plate remaining on the edge of the sole plate A using the welding residue removal device of the third embodiment will be described.

[0107] First, as shown in Figure 32, after placing the steel sheet A on the stand D, worker X holds the handle 65 of the cart 50 and moves the cart 50 to the side of the welding residue B to be removed that remains on the edge of the steel sheet A. Next, the main frame 53 suspended and supported by the arm 56 of the cart 50 is rotated so that it is perpendicular to the edge of the steel sheet A, and as shown in Figures 33 and 35, the mold 52 of the main frame 53 is positioned opposite the edge of the steel sheet A.

[0108] In this state, when hydraulic oil is supplied to the cylinder tube 54a from the hydraulic pump 62 of the carriage 50 via the hydraulic hose 61, the piston rod 54b extends and the receiving die 60 is pressed against the edge of the sole plate A via the guide frame 59, and the main frame 53 moves forward by pivoting about the pivot shaft 57 of the arm 56 as shown in Figure 34, so that the die 52 fixed to the die installation frame 53b of the main frame 53 bites into the edge of the weld residue B. Then, by further advancing the die 52 together with the main frame 53, the weld residue B can be removed.

[0109] Next, a fourth embodiment of the present invention will be described with reference to FIGS.

[0110] The fourth embodiment is a modified example of the third embodiment, and common parts are given the same reference numerals and redundant explanations will be omitted.

[0111] In the third embodiment, the piston rod 54b is extended and retracted to move the main body frame 53 back and forth by pivoting the arm 56 around the pivot shaft 57 as the axis of rotation, but in the fourth embodiment, a linear slider 66 is provided at the other end of the arm 56, and a hanging bracket 58 is attached to this linear slider 66, so that the main body frame 53 moves back and forth in a linear motion.

[0112] In the fourth embodiment, as shown in FIG. 42, the device body 51 is suspended and supported using a weight-type balancer 67.

[0113] Next, a fifth embodiment of the present invention will be described with reference to FIGS.

[0114] Like the first embodiment, this fifth embodiment comprises an apparatus main body 70, a press die 72 that abuts against the edge of the welding residue B that remains welded on the steel plate A, an actuator 73 that advances the press die 72 from the inside to the outside of the steel plate A, applying a pressing force that breaks or shears the welded point between the welding residue B and the surface of the steel plate A, and a reaction force receiving portion 74 that abuts against the edge of the steel plate A and absorbs the reaction force when the press die 72 presses.

[0115] The device main body 70 includes a fan-shaped main body base 71 having a fan-shaped opening 71a large enough to accommodate welding residue B remaining on the edge of the sheet metal A. The press die 72 is moved by an actuator 73 so as to draw an arc along the fan-shaped opening 71a from one side of the opening 71a of the main body base 71 located inside the sheet metal A to the other side of the opening 71a located outside the sheet metal A.

[0116] The actuator 73 includes a rotating arm 73a that rotates along the upper surface of the main body base 71 around a fulcrum shaft 73e provided at a key portion of the sector-shaped main body base 71, and an electric motor 73b that rotates the rotating arm 73a. A rack 73c that follows the outer arc of the sector-shaped main body base 71 is provided at the tip of the rotating arm 73a. By rotating the rack 73c using the electric motor 73b and pinion 73d provided near the top of the sector-shaped main body base 71, the rotating arm 73a rotates around the fulcrum shaft 73e.

[0117] The mold 72 is fixed to the rotating arm 73a so that the rotating arm 73a is positioned close to one side of the fan-shaped opening 71a of the main body base 71, which is located inside the upper surface of the iron plate A, and abuts against the edge of the welding residue B contained in the opening 71a of the main body base 71.

[0118] A receiving mold 74 that abuts against the edge of the sheet metal A is installed at the other side of the fan-shaped opening 71a of the main body base 71, and the pressing mold 72 is pressed by rotating the rotating arm 73a. The reaction force generated by this pressing is absorbed by the edge of the sheet metal A via the receiving mold 74, so that the welding residue B is sandwiched between the pressing mold 72 and the receiving mold 74 and is pushed off, as shown in Figures 45 and 46.

[0119] If the lever ratio between the fulcrum shaft 73e of the rotary arm 73a and the pressing die 72 is increased, the torque of the electric motor 73b can be reduced.

[0120] The main body base 71 is provided with an auxiliary guide 71b that prevents the rotation arm 73a from floating up along the outer arc of the fan-shaped opening 71a.

[0121] In this fifth embodiment, the welding residue B contained in the fan-shaped opening 71a of the main body base 71 is cut into from the corner by the push die 72 of the rotating arm 73a, so that the thrust force of the actuator 73 that pushes through the welding residue B can be kept small.

[0122] Next, the sixth embodiment of the present invention shown in Figures 47 and 48 is a modified example of the fifth embodiment, in which the rotating arm 73a is rotated using a hydraulic cylinder 73f instead of an electric motor 73b.

[0123] In the sixth embodiment, a cylinder tube 73h of a hydraulic cylinder 73f is installed near the top of the sector of the main body base 71 so that a piston rod 73g of the hydraulic cylinder 73f extends along the outer edge of the sector. The tip of the piston rod 73g is connected to the tip of a rotating arm 73a, and the rotating arm 73a moves in an arc by extending and retracting the piston rod 73g.

[0124] In the sixth embodiment, the configuration is the same as that of the fifth embodiment except that a hydraulic cylinder 73f is used as the actuator 73.

[0125] Next, a seventh embodiment of the present invention will be described with reference to FIGS.

[0126] This seventh embodiment is an example in which an apparatus main body 81 is provided with a press die 82 that is brought into contact with the edge of welding residue B that remains welded to the upper surface of steel plate A, and an actuator that advances this press die 82 from the outside to the inside of steel plate A, applying a pressing force to break or shear the welded point between the welding residue B and the upper surface of steel plate A, and a part of the apparatus main body 81 is brought into contact with a base E of steel plate A that is located diagonally to the edge of welding residue B that the press die 82 is in contact with, thereby taking up the reaction force when the press die 82 presses against the edge of welding residue B.

[0127] In this seventh embodiment, the removal work is performed by placing the steel sheet A on a pedestal E having engagement parts E1 protruding from the periphery of its underside, and the reaction force generated when the press die 82 presses against the edge of the welding residue B is absorbed by the engagement parts E1 of the pedestal E. The pedestal E is provided with a stopper E2 to prevent the steel sheet A placed on the pedestal E from shifting during the work of removing the welding residue B.

[0128] The device body 81 in the seventh embodiment includes a pair of side frames 84 spaced apart from each other at a distance greater than the width of the welding residue B.

[0129] The pair of side frames 84 comprise a lower portion 84a that extends beyond the engagement portion E1 that protrudes from the underside of the base E of the steel plate A and toward the inside of the underside of the steel plate A, a bent portion 84b that bends upward from the rear end of the lower portion 84a and whose upper surface abuts the underside of the base E, and a vertical portion 84c that extends vertically upward from the rear of the lower portion 84a, facing the edge of the steel plate A.

[0130] A cylinder fixing portion 84d is bridged across the vertical portions 84c of the pair of side frames 84. The cylinder fixing portion 84d fixes the cylinder tube 83b of the hydraulic cylinder 83a, which serves as an actuator for advancing the press die 82, which presses the edge of the welding residue B from the outside, from the outside to the inside.

[0131] The cylinder tube 83b of the hydraulic cylinder 83a is installed so that the center of the cylinder tube 83b is aligned with the edge of the welding residue B, and the piston rod 83c faces the welding residue B side.

[0132] A press die 82 is attached to the tip of the piston rod 83c, and as shown in Figure 52, by extending the piston rod 83c and moving the press die 82 forward, the welding residue B can be pulled off from the top surface of the sole plate A.

[0133] In this seventh embodiment, a receiving mold 85 is fitted between the bent portions 84b of a pair of side frames 84 extending from the underside of the base E and the engagement portion E1 on the underside of the base E, so that the reaction force is absorbed through the receiving mold 85.

[0134] Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and can be embodied in various other forms. [Explanation of symbols]

[0135] 1, 31, 51, 70, 81...Device body 2, 32, 52, 72, 82... Pressing die 2a···Die body 2b...Blade tip 3, 33, 54, 73... Actuator 4, 34...Reaction force receiving part 10, 50... cart 60, 74...Mold

Claims

1. This device for removing welding residue from the surface of a steel sheet comprises a main body, a press die that is brought into contact with the edge of the welding residue that remains on the steel sheet while still welded, an actuator that advances the press die from the inside to the outside of the steel sheet, applying a pressing force that breaks or shears the welded area between the welding residue and the surface of the steel sheet, and a reaction force receiving section that absorbs the reaction force when the press die presses.

2. This device for removing welding residue from the surface of a steel sheet comprises a main body, a press die that is brought into contact with the edge of the welding residue that remains on the steel sheet while still welded, an actuator that advances the press die from the outside to the inside of the steel sheet, applying a pressing force that breaks or shears the welded area between the welding residue and the surface of the steel sheet, and a reaction force receiving section that receives the reaction force when the press die presses against the edge of the welding residue.

3. 3. The apparatus for removing welding residue from the surface of a steel sheet according to claim 1, wherein the main body of the apparatus is mounted on a carriage that can move on the steel sheet.

4. 3. An apparatus for removing welding residue from the surface of a steel sheet according to claim 1, wherein the main body of the apparatus is supported by being suspended from a carriage that can move along the periphery of the steel sheet.

5. 3. The apparatus for removing welding residue from the surface of a steel sheet according to claim 1, wherein the pressing surface of the pressing die is provided with a cutting edge having a rake surface that bites into the welding point between the welding residue and the surface of the steel sheet.

Images