Residual projection material removal device

Abstract

To provide a residual projection material removal device that can remove a projection material remaining on a surface of a work-piece with good efficiency without increasing a device size.SOLUTION: A residual projection material removal device, which removes a projection material 39 remaining on a surface of a work-piece 1 of which the surface is processes by the projection material 39, has at least one brush 13 which is configured in such a manner that a plurality of hair materials 38 for removing the projection material 39 remaining on the surface of the work-piece 1 are bundled. A flex angle θ of the hair material 38 during removal of the projection material 39 by the brush 13 is 20° or more and 40° or less.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a device for removing residual projection material. [Background technology]

[0002] Shot blasting, in which shot particles collide with the surface of a workpiece, has been known as a method for removing scale and other particles that have formed on the surface of a workpiece, such as a thick steel plate. Shot blasting can remove scale from the surface of the workpiece. However, shot blasting can sometimes cause residual magnetization on the surface of the workpiece. If residual magnetization occurs on the surface of the workpiece, the residual magnetization can cause shot particles to remain on the surface of the workpiece. These shot particles remaining on the surface of the workpiece (hereinafter referred to as "residual shot particles") can adversely affect subsequent processes, such as painting and shipping, after shot blasting. Therefore, there is a need for an efficient method for removing the residual shot particles.

[0003] As a method for removing the residual shot particles, for example, a method using a rotating brush to remove the residual shot particles from the surface of the workpiece, or a method tilting the workpiece to slide the residual shot particles off the surface of the workpiece, have been proposed. However, these methods require a rotating device to rotate the brush and a tilting device to tilt the workpiece. Therefore, these methods may result in an increase in the size of the entire apparatus.

[0004] Therefore, Patent Documents 1 and 2 disclose examples of methods for removing residual shot particles from the surface of a workpiece using a brush, without using the above-mentioned device. The brush described in Patent Document 1 is composed of a large number of highly elastic metallic or non-metallic wires bound together. In Patent Document 1, brushes of the above-mentioned configuration are fixed to frames above and below the exit of a shot blasting room where shot blasting is performed on H-beam steel. The H-beam steel is passed between the brushes to remove residual shot particles from the surface of the H-beam steel.

[0005] The brush described in Patent Document 2 is composed of multiple long flexible members made of a highly elastic material such as resin. In Patent Document 2, brushes of the above-described configuration are arranged in the transport path of the H-beam in a shot blasting machine so as to contact the underside of the H-beam. The installation height of the brushes can be adjusted to an appropriate height depending on the height of the H-beam. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Utility Model Application Publication No. 56-94264 [Patent Document 2] International Publication No. 2012 / 014514 Summary of the Invention [Problem to be solved by the invention]

[0007] The efficiency with which a brush removes residual shot particles varies depending on factors such as the material of the brush's bristles, the degree of flexibility of the bristles, the planting density of the bristles, the cross-sectional diameter of the bristles, and the hardness of the bristles. However, Patent Documents 1 and 2 do not consider any of the above-mentioned factors for improving the efficiency with which residual shot particles are removed. In other words, there is still room for improvement in order to efficiently remove residual shot particles.

[0008] The present invention has been made to solve the above-mentioned problems, and aims to provide a residual projection material removal device that can efficiently remove projection material remaining on the surface of a workpiece without increasing the size of the device. [Means for solving the problem]

[0009] The means for solving the above problems are as follows. [1] A residual projection material removal device that removes projection material remaining on the surface of a workpiece that has been surface-treated with projection material, the device having at least one brush composed of a bundle of bristles that removes the projection material remaining on the surface of the workpiece, and the bending angle of the bristles when removing the projection material with the brush is between 20° and 40°. [2] The average cross-sectional diameter of the bristle material is equal to or less than the average particle size of the projection material, and the planting density of the bristle material is 30 pieces / cm 2 Over 70 strands / cm 2 A residual projection material removal device according to [1], which is as follows: [3] A residual projection material removal device as described in [1] or [2], wherein the brushes are aligned across the entire width of the workpiece, and the ends of adjacent brushes overlap. [4] A residual projection material removal device according to any one of [1] to [3], wherein the brush is a broom made of broom grass bundled together as the bristles. [Effects of the Invention]

[0010] According to the present invention, it is possible to efficiently remove the projection material remaining on the surface of the workpiece without increasing the size of the device. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a diagram showing an example of a processing line for processed materials to which the residual projection material removal device according to this embodiment can be applied. FIG. [Figure 2] FIG. 2 is a diagram showing an example of a residual projection material removal device according to the present embodiment. [Figure 3] FIG. 3 is an enlarged view of a portion of the removal device shown in FIG. 2. [Figure 4] FIG. 10 is a perspective view illustrating the bending angle of the brush. [Figure 5] FIG. 10 is a side view illustrating the bending angle of the brush. [Figure 6] FIG. 2 is an enlarged view of a portion of the brush. DETAILED DESCRIPTION OF THE INVENTION

[0012] An example of an embodiment of the present invention (hereinafter referred to as this embodiment) will be described below with reference to the drawings. A residual blast material removal device (hereinafter referred to as the removal device) according to this embodiment is configured to use a brush to remove blast material remaining on the surface of a workpiece that has been surface-treated with blast material. FIG. 1 is a diagram showing an example of a workpiece processing line to which the removal device according to this embodiment can be applied. Examples of the workpiece shown in FIG. 1 include thick steel plates and steel plates with improved wear resistance (hereinafter simply referred to as steel plate 1). In the example shown in FIG. 1, the steel plate 1 is transported to a heat treatment furnace 2 and heated. Scale forms on the surface of the steel plate 1 due to heating in the heat treatment furnace 2. The heat treatment furnace 2 may be a conventionally known heat treatment furnace installed in a production line at a steelworks (not shown). The steel plate 1 heated in the heat treatment furnace 2 is transported to a processing device 3 installed downstream of the heat treatment furnace 2 in the conveying direction of the steel plate 1.

[0013] The processing device 3 is configured to collide a large amount of blast material (not shown) at high speed against the surface of the steel plate 1 to process the surface of the steel plate 1. Specifically, the processing device 3 can be, for example, a shot blasting device that blasts blast material against the surface of the steel plate to remove scale from the surface of the steel plate, or a shot peening device that blasts blast material against the surface of the steel plate to work-harden the surface of the steel plate. In this embodiment, a case will be described as an example in which a conventionally known shot blasting device (hereinafter referred to as shot blasting device 3) is installed as the processing device.

[0014] The shot material of the shot blasting device 3 may be made of cast iron, for example, with a particle size of 1.0 mm and a weight of about 4 μg per shot material (4 μg / piece). Most of the shot material that hits the surface of the steel plate 1 is recovered within the shot blasting device 3. However, when the surface of the steel plate 1 is subjected to shot blasting, residual magnetization occurs on the surface of the steel plate 1, and this residual magnetization may cause the shot material to remain on the surface of the steel plate. For this reason, a removal device 4 that removes the shot material remaining on the surface of the steel plate is installed downstream of the shot blasting device 3 in the conveying direction.

[0015] FIG. 2 is a diagram showing an example of a removal device according to this embodiment. The removal device 4 shown in FIG. 2 is arranged alongside a transport device that transports the steel sheet 1. The transport device has a plurality of transport rolls 5, which are arranged side by side along the transport direction of the steel sheet 1. A drive device for the transport device (not shown) is connected to at least one of the transport rolls 5 so as to transmit power. An example of the drive device for the transport device is a motor. The drive device for the transport device is operated to rotate the transport rolls 5, thereby transporting the steel sheet 1 placed on the transport rolls 5. Note that FIG. 2 shows the steel sheet 1 placed on the transport rolls 5.

[0016] The removal device 4 shown in FIG. 2 also includes an upper frame 6 located above the steel plate 1 in the vertical direction of the removal device 4, and a lower frame 7 located below the steel plate 1 in the vertical direction.

[0017] (Upper frame) The upper frame 6 extends in the width direction of the removal device 4 and the steel plate 1. As shown in FIG. 2, the length of the upper frame 6 is set to be longer than the width of the transport roll 5. Both ends of the upper frame 6 are supported by pillars (hereinafter referred to as upper pillars) 9 fixed to the floor 8. A brush stand (hereinafter referred to as upper brush stand) 10 configured to be movable in the vertical direction of the removal device 4 is provided on the upper pillars 9. The upper brush stand 10 has a pair of beams (hereinafter referred to as upper beams) 11 extending in the width direction, and a plurality of brackets (hereinafter referred to as upper brackets) 12 attached to the upper beams 11 in a line in the width direction. The two upper beams 11 are arranged at a predetermined interval in the vertical direction. The two upper beams 11 are also connected to each other in the vertical direction via the upper brackets 12.

[0018] In the example shown in Fig. 2, five upper brackets 12 are attached to the upper beam 11. Fig. 3 is an enlarged view of a portion of the removal device shown in Fig. 2. As shown in Fig. 3, the upper bracket 12 is formed in a rectangular ring shape. A plurality of brushes 13 are attached to the upper bracket 12 by a predetermined fixing means.

[0019] The brushes 13 are used to remove blast material remaining on the surface of the steel plate 1 and are made of a bundle of bristles. Examples of the brushes 13 include a tatami broom made of broom grass bristles, a resin broom made of brooms made of synthetic resin bristles, and a bamboo broom made of brooms made of bamboo bristles. In the examples shown in Figures 2 and 3, the brushes 13 are lined up in the width direction and fixed to each upper bracket 12 by the fixing means described above so that the tips of the bristles are located on the upper surface of the steel plate 1. Furthermore, to prevent gaps from forming between the brushes 13 in the width direction, the ends of adjacent brushes 13 in the width direction slightly overlap. Examples of the fixing means described above include adhesive tape, cable ties, and bolts. In the example shown in Figure 2, the brushes 13 are lined up across the entire width of the steel plate 1. Furthermore, Figure 3 shows an example in which the brushes 13 are fixed to the upper bracket 12 by cable ties.

[0020] Returning to the explanation of Figure 2, as shown in Figure 2, height adjustment devices (hereinafter referred to as upper height adjustment devices) 14 are connected to both ends of the upper brush stand 10, i.e., both ends of each upper beam 11. The upper brush stand 10 can be raised and lowered in the vertical direction by these upper height adjustment devices 14. Each upper height adjustment device 14 has a screw jack 15 and a linear guide 16 that guides the movement of the upper brush stand 10 in the vertical direction. In addition, a drive device for the upper height adjustment device (hereinafter referred to as upper drive device) 17 and a reducer 18 are connected to each upper brush stand 10. In the following explanation, the components located on one side in the width direction (the left side in the horizontal direction of Figure 2) are designated by the symbol "a," and the components located on the other side (the right side in the horizontal direction of Figure 2) are designated by the symbol "b."

[0021] An example of the upper drive device 17 is a motor. As shown in FIG. 2, the upper drive device 17 is provided on one side of the upper frame 6 in the width direction. A reducer 18 is connected to the output shaft of the upper drive device 17. The reducer 18 is configured to increase the torque generated by the upper drive device 17.

[0022] One upper height adjustment device 14a is connected to the output shaft of the reducer 18. Specifically, the worm shaft 19a of one screw jack 15a is connected to the output shaft of the reducer 18 so as to be capable of transmitting power. The worm shaft 19a extends vertically and rotates about an axis that runs vertically. That is, the worm shaft 19a is rotatably attached to one upper support column 9a in the width direction. A traveling nut 20a is engaged with the worm shaft 19a. The traveling nut 20a and a slider 21a of one linear guide 16a are movably connected to each other as a unit. The slider 21a is configured to be movable on a rail (not shown) of the linear guide 16a. The rail extends vertically and is fixed to one upper support column 9a in the width direction.

[0023] The other upper height adjustment device 14b is connected to the output shaft of the reducer 18 via a power transmission shaft 22. In the example shown in Fig. 2, three power transmission shafts 22 are aligned in the width direction. The power transmission shafts 22 are connected to each other via couplings 23 and fixed to the upper frame 6 via bearings 24.

[0024] The other upper height adjustment device 14b has the same configuration as the above-mentioned one upper height adjustment device 14a. That is, the worm shaft 19b of the other screw jack 15b is connected to the power transmission shaft 21 so as to be capable of transmitting power. The worm shaft 19b extends in the vertical direction and rotates around an axis that also extends in the vertical direction. The worm shaft 19b is rotatably attached to the upper support column 9b on the other side in the width direction. A traveling nut 20b is engaged with the worm shaft 19b. The traveling nut 20b and a slider 21b of the other linear guide 16b are movably connected to each other as a unit. The slider 21b is configured to be movable on a rail (not shown) of the linear guide 16b. The above-mentioned rail extends in the vertical direction and is fixed to the upper support column 9b on the other side in the width direction.

[0025] (lower frame) The lower frame 7 extends in the width direction, and in the example shown in FIG. 2, is supported by pillars (hereinafter referred to as lower pillars) 25 with a small gap between it and the floor 8. Specifically, the length of the lower frame 7 is set shorter than the width of the transport roll 5, as shown in FIG. 2. A brush stand (hereinafter referred to as lower brush stand) 26 configured to be movable in the vertical direction of the removal device 4 is provided on the lower pillars 25. The lower brush stand 26 has two beams (hereinafter referred to as lower beams) 27 extending in the width direction, and a plurality of lower brackets 28 attached to the lower beams 27 in a line in the width direction. The two lower beams 27 are arranged at a predetermined interval in the vertical direction. The two lower beams 27 are also connected to each other via the lower brackets 28.

[0026] In the example shown in FIG. 2 , each lower bracket 28 is formed in a rectangular ring shape. A plurality of brushes 13 are arranged in the width direction and attached to the lower brackets 28 by a predetermined fixing means so that the tips of the bristles of the brushes 13 are positioned on the underside of the steel plate 1. The brushes 13 may be the aforementioned tatami brooms, plastic brooms, or bamboo brooms. Furthermore, to prevent gaps from forming between the brushes 13 in the width direction, the ends of adjacent brushes 13 in the width direction slightly overlap. Examples of the fixing means include adhesive tape, cable ties, or bolts. That is, the brushes 13 are fixed to the lower brackets 28 in the same manner as the brushes 13 are fixed to the upper bracket 12 shown in FIG. 3 .

[0027] Height adjustment devices (hereinafter referred to as lower height adjustment devices) 29 are connected to both ends of the lower brush stand 26, i.e., both ends of each lower beam 27. The lower brush stand 26 can be raised and lowered in the vertical direction by these lower height adjustment devices 29. Each lower height adjustment device 29 is equipped with a screw jack 30 and a linear guide 31 that guides the movement of the lower brush stand 26 in the vertical direction. A drive device (hereinafter referred to as lower drive device) 32 for the lower height adjustment device is also connected to the lower height adjustment device 29. In the following description, the component located on one side in the width direction (the left side in the horizontal direction of FIG. 2) is designated by the symbol "a," and the component located on the other side (the right side in the horizontal direction of FIG. 2) is designated by the symbol "b."

[0028] An example of the lower drive unit 32 is a motor. In the example shown in Fig. 2, the lower drive unit 32 is installed at approximately the center of the lower frame 7 in the width direction. Power transmission shafts 33 extending in the width direction are respectively arranged on both sides of the lower drive unit 32 in the width direction. Each power transmission shaft 33 is fixed to the lower frame 7 via a bearing 34, and is connected to the output shaft of the lower drive unit 32 so as to be able to transmit torque.

[0029] Of the two ends of each power transmission shaft 33, the end opposite the end connected to the lower drive unit 32 is power-transmittably connected to worm shafts 35a, 35b of the screw jacks 30a, 30b of the lower height adjustment unit 29. Each worm shaft 35a, 35b extends vertically and rotates around an axis along the vertical direction. Each worm shaft 35a, 35b is rotatably attached to a support bar (not shown) that extends from the lower frame 6. Traveling nuts 36a, 36b engage the worm shafts 35a, 35b. The traveling nuts 36a, 36b and sliders 37a, 37b of the linear guides 31a, 31b are movably connected to each other as a single unit. Each slider 37a, 37b is configured to move on rails (not shown) of the linear guide 31. The rails extend vertically and are fixed to the lower lower supports 25a, 25b, respectively.

[0030] (Adjusting the height of brush 13) In this embodiment, the height from the surface of the steel sheet to the brush 13 is set so that the contact pressure of the brush 13 on the steel sheet 1 is a predetermined contact pressure. The predetermined contact pressure varies depending on conditions such as the amount of wear of the brush 13 and the amount of blast material remaining on the steel sheet surface (hereinafter referred to as the residual amount), but is, for example, 1.0 to 2.0 kgf (9.8 to 19.6 N). That is, the target value of the height at which the contact pressure of the brush 13 on the steel sheet 1 becomes the predetermined contact pressure is set based on conditions such as the amount of wear of the brush 13 and the amount of residual blast material, as well as the thickness of the steel sheet 1. Then, the operating amounts of the upper drive device 17 and the lower drive device 32 and the current values ​​applied to these drive devices are controlled so that the actual measured value of the height approximately matches the target value. In this way, the actual height from the surface of the steel sheet to the brush 13 in the removal device 4 configured as shown in FIG. 2 is adjusted to adjust the contact pressure of the brush 13 on the steel sheet 1. The height from the steel plate surface to the brush 13 refers to the distance between the steel plate surface and a reference point (not shown) that is set in advance on the brush 13. The contact pressure described above can be measured by a load sensor (not shown) or the like that is attached to the brush 13. The remaining amount of projection material can be estimated by, for example, photographing the steel plate surface with an imaging device such as a camera and measuring the amount of projection material in the photographed image.

[0031] Alternatively, the relationship between conditions such as the amount of wear of the brush 13 and the amount of remaining blast material, and the height at which the contact pressure of the brush 13 on the steel sheet 1 becomes a predetermined contact pressure, may be obtained in advance as data. Then, based on this data and actual measurement values ​​of conditions such as the amount of wear of the brush 13 and the amount of remaining blast material, a target value for the height at which the contact pressure of the brush 13 on the steel sheet 1 becomes a predetermined contact pressure is calculated. Next, the operating amounts of the upper drive device 17 and the lower drive device 32 and the current values ​​applied to these drive devices are controlled so that the target value and the actual measurement value of the height approximately match. In this way, the operation of the drive devices 17, 32 may be controlled to change the contact pressure of the brush on the steel sheet surface.

[0032] The removal device 4 shown in Fig. 2 includes a level meter (not shown) that measures the height from the steel plate surface to the brush 13, a thickness meter (not shown) that measures the thickness of the steel plate 1, and a control device (not shown) that controls the height. The control device is mainly composed of a microcomputer, and is configured to perform calculations based on input data, pre-stored data, and arithmetic expressions, and to output the results. The input data can be, for example, measurements taken by the level meter or thickness meter. The output data can be, for example, the operating amounts of the upper drive device 17 and the lower drive device 32, and the current values ​​applied to these drive devices 17, 32.

[0033] (Bending angle θ of brush 13) The brush 13 of this embodiment is characterized in that, when the brush 13 is adjusted to the height adjusted as described above, i.e., when the contact pressure of the brush 13 against the steel sheet 1 is set in the range of 1.0 to 2.0 kgf, the bending angle θ is 20° or more and 40° or less. FIG. 4 is a perspective view illustrating the bending angle θ of the brush 13. FIG. 5 is a side view illustrating the bending angle θ of the brush 13. As the brush 13 gradually approaches the steel sheet surface, as shown in FIGS. 4 and 5, the tip of the brush 13 comes into contact with the steel sheet surface, and at least a portion of the brush 13 bends into an arc shape. The brush 13 bent into this arc shape is photographed, for example, by an imaging device (not shown). The photographed image is then analyzed by a control device to calculate a circle α with a curvature radius r that approximates the bent brush 13 into an arc shape, as shown in FIGS. 4 and 5. Furthermore, the point β where the steel sheet surface and the brush 13 contact (hereinafter referred to as the contact point) is calculated by image analysis by the control device. Then, the tangent γ to the circle α passing through the contact point β is calculated, and the angle formed by the tangent γ and the surface of the steel sheet is calculated. This angle is the bending angle θ of the brush described above.

[0034] If the bending angle is greater than 40°, the contact area of ​​the brush 13 with the steel sheet 1 becomes excessively small, and the brush 13 may not be able to contact the steel sheet surface sufficiently or uniformly. This may reduce the efficiency with which the brush 13 removes the blast material. On the other hand, if the bending angle is less than 20°, the brush may be pressed excessively against the steel sheet surface, resulting in an excessively large contact area and increasing the gaps between the bristles of the brush 13 on the steel sheet surface. This may result in an increase in the amount of blast material that slips through the gaps between the bristles of the brush 13 when the brush 13 is used to remove the blast material, making it impossible to remove the blast material efficiently. For this reason, in this embodiment, the bending angle θ of the brush 13 is set to be greater than or equal to 20° and less than or equal to 40°.

[0035] FIG. 6 is an enlarged view of a portion of the brush 13. As shown in FIG. 6, in this embodiment, the average cross-sectional diameter d per bristles 38 of the brush 13 is preferably equal to or less than the average particle diameter D of the projection material 39. In other words, if the average cross-sectional diameter d of the bristles 38 is greater than the average particle diameter D of the projection material 39, the gaps between the bristles 38 may be larger than when the average cross-sectional diameter d of the bristles 38 is equal to or less than the average particle diameter D of the projection material 39. This is to avoid the possibility that more projection material 39 may slip through the gaps. Specifically, if the average particle diameter D of the projection material 39 is 1.0 mm, the average cross-sectional diameter d of the bristles 38 is preferably equal to or less than 1.0 mm. On the other hand, if the cross-sectional diameter d of the bristles 38 is too small, the bristles 38 may be too soft, which may increase the gaps between the bristles 38 and allow more projection material to slip through. For this reason, the average cross-sectional diameter d of the bristles 38 is preferably equal to or greater than 0.1 mm.

[0036] Furthermore, in this embodiment, the density of the hairs 38 per unit area (referred to as planting density) is 30 hairs / cm 2 Over 70 strands / cm 2 This is preferable when the planting density is 30 pieces / cm or less, for example. 2If the planting density is less than 70 strands / cm, gaps may occur between the bristles 38, making it impossible to remove the projection material 39. 2 In the case of a brush 13 with a larger diameter, the bristles 38 support each other, making it difficult for the brush 13 to bend. As a result, the contact area between the steel plate surface and the brush 13 becomes smaller, making it difficult to remove the blast material 39, and this is to avoid this.

[0037] In this embodiment, the bending angle θ of the brush 13 is set within the above-described angle range. This allows for efficient removal of the blast material 39 remaining on the steel sheet surface. In particular, in this embodiment, in addition to the bending angle θ of the brush 13, the cross-sectional diameter d of the bristles 38 and the planting density of the bristles 38 are also optimized. This allows for more efficient removal of the blast material 39 remaining on the steel sheet surface. Furthermore, in this embodiment, as described above, the blast material 39 remaining on the steel sheet surface is removed by the brush 13 of the removal device 4 installed on the exit side of the processing device 3. This reduces the size of the device compared to conventional methods such as using a rotating brush, tilting the steel sheet, or removing blast material remaining on the steel sheet surface by air blowing. Furthermore, in this embodiment, no power is used in the removal device except for vertically moving the height adjustment devices 14, 29 to adjust the height of the brush 13 from the steel sheet surface. This reduces energy consumption compared to the conventional methods described above. That is, even if the removal device according to this embodiment is continuously operated in the processing line shown in FIG. 1, an energy saving effect can be expected compared to conventionally known methods.

[0038] The present invention is not limited to the above-described embodiment. For example, the brush stands 10, 26 may be moved up and down by a rack and pinion instead of the screw jacks 15, 30. Even with such a configuration, it is possible to obtain substantially the same functions and effects as the above-described embodiment. [Example]

[0039] An example conducted to confirm the action and effect of this embodiment will now be described. Various brushes (brooms) were attached to a removal device configured similarly to the removal device shown in FIG. 2. The bending angle, cross-sectional diameter, and planting density of each brush when it was brought into contact with a steel plate at a contact pressure of 1.0 to 2.0 kgf are shown in Table 1. The performance of each brush in removing blast material remaining on the steel plate surface was also evaluated. The evaluation results are summarized in Table 1. [Table 1]

[0040] Note that a "zashiki broom" refers to a broom made of broom grass bristles bound together. A resin broom refers to a broom made of synthetic resin bristles bound together. A bamboo broom refers to a broom made of bamboo bristles bound together. A "good" in the evaluation column of Table 1 indicates that the blast material remaining on the surface of the steel plate that passed through the removal device was successfully removed, and the steel plate can be shipped as a product or supplied to the next process. A "bamboo" indicates that the blast material remaining on the surface of the steel plate was not sufficiently removed, and the steel plate cannot be shipped as a product or supplied to the next process. A "good" indicates that a small amount of blast material remained on the surface of the steel plate, but the steel plate can be shipped as a product or supplied to the next process.

[0041] As shown in Table 1, it was found that, regardless of which broom was used, the blast material remaining on the steel plate surface could be efficiently removed as long as the bending angle of each broom was within the above-mentioned angle range. In particular, the tatami brooms produced favorable results, with the bending angle falling within the above-mentioned angle range for all brooms. This is thought to be because the bristles of the tatami brooms are long and, compared to bristles made of other materials, are flexible and soft. In other words, when the tatami broom is brought into contact with the steel plate surface, the bristles can be brought into uniform contact with the steel plate surface. This is thought to have enabled the blast material remaining on the steel plate surface to be efficiently removed by the tatami broom. In contrast, the bristles of resin brooms and bamboo brooms are harder than those of broom grass. For this reason, when these brooms are brought into contact with the surface of a steel plate, it is difficult for the bending angle to fall within the above-mentioned angle range, and as a result, the bristles are unable to make sufficient contact with the surface of the steel plate, and many brooms are unable to efficiently remove the projection material remaining on the surface of the steel plate. [Explanation of symbols]

[0042] 1. Residual projectile removal device 2. Heat treatment furnace 3 Processing equipment 4 Removal device 5. Transport roll 6 Upper frame 7 Lower frame 8 floors 9a, 9b Upper support 10 Upper brush stand 11 Upper beam 12 Upper bracket 13 Brushes 14, 14a, 14b Upper height adjustment device 15, 15a, 15b Screw jack 16 Linear guide 17 Upper drive unit 18 Reducer 19a, 19b Worm shaft 20a, 20b traveling nuts 21a, 21b slider 22 Power transmission shaft 23 Coupling 24 Bearings 25a, 25b Lower support 26 Lower brush stand 27 Lower beam 28 Bottom Bracket 29a, 29b Lower height adjustment device 30, 30a, 30b screw jack 31 Linear guide 32 Lower drive unit 33 Power transmission shaft 34 Bearings 35a, 35b worm shaft 36a, 36b traveling nuts 37a, 37b slider 38 Hair material 39 Projection material d Cross-sectional diameter of bristle material D Particle size of the projection material α A circle that approximates a curved brush β Contact point between steel plate and brush γ Tangent to circle α passing through point of contact β

Claims

1. A residual projection material removal device that removes projection material remaining on the surface of a workpiece that has been surface-processed with projection material, the device having at least one brush formed by bundling a plurality of bristles that removes the projection material remaining on the surface of the workpiece, and wherein the bending angle of the bristles when removing the projection material with the brush is between 20° and 40°.

2. The average cross-sectional diameter of the bristles is equal to or less than the average particle diameter of the projection material, and the planting density of the bristles is 30 bristles / cm ２ Over 70 strands / cm ２ 2. A residual projection material removal device according to claim 1, wherein:

3. 2. A residual projection material removal device according to claim 1, wherein the brushes are arranged across the entire width of the workpiece, and the ends of adjacent brushes overlap each other.

4. 3. A residual projection material removal device according to claim 2, wherein the brushes are arranged across the entire width of the workpiece, and the ends of adjacent brushes overlap each other.

5. 2. The residual projection material removal device according to claim 1, wherein the brush is a broom made of broom grass bundled together as the bristles.

6. 3. The residual projection material removal device according to claim 2, wherein the brush is a broom made of broom grass bundled together as the bristles.

7. 4. The residual projection material removal device according to claim 3, wherein the brush is a broom made of broom grass bundled together as the bristles.

8. 5. The residual projection material removal device according to claim 4, wherein the brush is a broom made of broom grass bundled together as the bristles.

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