Blast Processing Equipment

Abstract

To provide a blast processing device capable of preventing inclination to a conveyance direction of a workpiece at a blast processing time, with a simple structure.SOLUTION: A blast processing device 1 including a roller-conveyor 5 having multiple rollers 7 on a conveyance mechanism 3 of a workpiece W, for projecting a projection material from the interval between each roller 7 of the roller-conveyor 5, is provided with a guide part 11 for guiding the workpiece W to a roller 7 center part direction, when the workpiece W is moved to the end 9 of the roller 7, on at least one end 9 of a part or the all of rollers 7 of the roller-conveyor 5.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a blasting device. [Background technology]

[0002] BACKGROUND ART A blasting apparatus equipped with a belt conveyor or roller conveyor as a transport mechanism is known as an apparatus for continuously blasting flat plate-shaped workpieces.

[0003] A blasting machine using a belt conveyor is used for processing only the top surface (one side) of a workpiece. This type of blasting machine has the advantage of being able to blast the workpiece, but if the bottom surface (opposite side) is to be blasted, the workpiece must be turned over after processing the top surface and the untreated side must be processed as the top surface.

[0004] In contrast, blasting equipment using roller conveyors can blast both the top and bottom surfaces of workpieces. Blasting of the bottom surface is achieved by projecting blast material through the gap between the rollers. To prevent roller wear due to the blast material colliding with the rollers, the gap between the rollers must be wide enough to ensure the blast material is dispersed. However, if the gap between the rollers is too wide, the workpiece may fall through the gap. Therefore, to prevent this, the treatable product length is generally set to at least three times the roller spacing. However, considering the relationship between the roller spacing and the length of the workpiece, it is theoretically possible to transport a product whose treatable length is more than twice the roller spacing.

[0005] However, the pressure from above or below, or a combination of these forces, acting on the workpiece due to the projected blast material can cause the workpiece to lift up during processing. When the workpiece is in this lifted state, it can get stuck in the gap between the rollers. Furthermore, the pressure from the shot projected from below, especially from below, can cause the product to tilt relative to the conveying direction. As a result, the product can come into contact with the inner wall of the device and become stuck inside the device due to friction. Alternatively, the product's orientation can change, causing it to fall through the gap between the rollers. Thus, there is room for improvement in processing relatively small workpieces. Furthermore, because the projectile force from the blast material acts unevenly on all workpieces, the product's orientation can tilt relative to the conveying direction, increasing the likelihood of the product getting stuck or falling, in the case of relatively light workpieces. While a small roller gap is sufficient for stable product transport, a sufficient roller gap is required to prevent roller wear, as mentioned above. Thus, there are conflicting challenges when setting the roller gap.

[0006] Patent Document 1 discloses a blasting device for processing lightweight workpieces, which prevents the workpiece from floating up when projected from below by providing a pressure roller on top. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Utility Model Application Publication No. 63-60555 Summary of the Invention [Problem to be solved by the invention]

[0008] In the blasting device described in Patent Document 1 above, a pressure roller installed on the top prevents the workpiece from floating up when projected from below, but further measures are required in case the workpiece is tilted with respect to the transport direction.

[0009] The present invention has been made in consideration of the above-mentioned circumstances, and the problem that the present invention aims to solve is to provide a blasting device with a simple structure that prevents the workpiece from tilting relative to the transport direction during blasting. [Means for solving the problem]

[0010] In order to solve the above problems, the present invention employs the following means. That is, one aspect of the present invention is a blasting device that includes a roller conveyor with a plurality of rollers in a transport mechanism for workpieces, and that projects blast material from gaps between the rollers of the roller conveyor. In this blasting device, at least one end of some or all of the rollers of the roller conveyor is provided with a guide section that guides the workpiece toward the center of the roller when the workpiece moves to the end of the roller. According to the present invention, a guide section is provided that guides the workpiece toward the center of the roller when the workpiece moves to the end of the roller, thereby preventing the workpiece from tilting relative to the conveying direction and preventing the workpiece from stagnating within the device.

[0011] In one aspect of the present invention, the guide portion is an annular protrusion extending in the radial direction of the roller. In this aspect, the guide portion is an annular convex portion extending in the radial direction of the roller, so that an effective shape can be adopted as the guide portion.

[0012] In one aspect of the present invention, the portion of the protrusion on the roller center side is an inclined surface that slopes downward toward the roller center. In this embodiment, the part of the convex portion on the center side of the roller is made into an inclined surface that slopes downward toward the center of the roller, so even if the workpiece rides on the inclined surface at the end of the roller, the rotation speed of the inclined surface is faster than that of the center of the roller, so the workpiece can be guided toward the center of the roller.

[0013] In one aspect of the present invention, the portion of the protrusion on the side of the center of the roller is formed as a curved surface that descends toward the center of the roller. In this embodiment, the portion of the convex portion on the roller center side is formed as a curved surface that descends toward the roller center, so that an appropriate shape can be selected as the shape of the convex portion.

[0014] In one aspect of the present invention, the inclined surface is formed with grooves or ridges that extend radially from a fixed position on the central axis of the roller. In this embodiment, grooves or ridges are formed on the inclined surface, so that an appropriate shape of the inclined surface can be selected depending on the state of the workpiece.

[0015] In one aspect of the present invention, a receiving member for preventing the workpiece from falling is provided in the gap between at least one pair of rollers. In this aspect, since a receiving member is provided in the gap between at least one pair of rollers, it is possible to prevent the workpiece from falling.

[0016] In one aspect of the present invention, the receiving member is a plate-like body having a plurality of openings. In this embodiment, the receiving member has a plurality of openings, so that the projection material can fall below the receiving member without remaining on the receiving member. [Effects of the Invention]

[0017] According to the present invention, it is possible to provide a blasting device with a simple structure that prevents the workpiece from tilting relative to the transport direction during blasting. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a side view schematically showing a blasting device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a view taken along the line AA in FIG. [Figure 3] 2 is a schematic front view of the blast processing device as seen from the direction of arrow B in FIG. 1. [Figure 4] FIG. 2 is an enlarged view of a main part of a transport mechanism according to the embodiment of the present invention. [Figure 5]FIG. 4 is an enlarged view of a roller end portion according to an embodiment of the present invention. [Figure 6] FIG. 10 is an enlarged view of a roller end portion according to a modified example of the present invention. [Figure 7] FIG. 10 is an enlarged view of a roller end portion according to a modified example of the present invention. [Figure 8] FIG. 10 is an enlarged view of a roller end portion according to a modified example of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0019] (Embodiment) An embodiment of the present invention will be described below with reference to the drawings. In this embodiment, the friction surface treatment and paint primer treatment of steel plates, such as splice plates and gusset plates used as steel construction materials, will be described as an example of a workpiece and its processing. When performing the friction surface treatment and paint primer treatment of steel plates, such as splice plates and gusset plates used as steel construction materials, a blasting device equipped with a belt conveyor or roller conveyor as a transport mechanism is used. In this case, the steel plates are used for joining steel structures using high-strength bolts, and therefore are subjected to various treatments based on the slip coefficient, surface roughness, etc., as specified in the Standard Specifications for Construction Work (JASS6 Steel Construction) (edited by the Architectural Institute of Japan). Other examples of workpieces include structural square bars and rail steel for the purpose of removing mill scale.

[0020] Fig. 1 is a side view schematically showing a blast processing device according to an embodiment of the present invention, and Fig. 2 is a view taken along line AA in Fig. 1. FIG. 3 is a schematic front view of the blast processing device as seen from the direction of arrow B in FIG.

[0021] In this specification, "projection" includes both cases where the projection material is projected by centrifugal force from an impeller, as in the case of using an impeller-type shot mechanism, and cases where the projection material is sprayed by compressed air or wind force, as in the case of using an air-type shot mechanism.

[0022] As shown in Figures 1 to 3, the blasting processing device 1 of this embodiment is equipped with, within a cabinet 2, a transport mechanism 3 that transports the workpiece W, a shot mechanism 17 that is arranged within the cabinet 2 and that performs blasting by projecting blasting material S onto the workpiece W, a blow-off mechanism 21 that blows off dust and blasting material S from above the workpiece W that has been blasted, and a blasting material circulation mechanism 19 that circulates the blasting material S between the shot mechanism 17 within the cabinet 2 and reuses it.

[0023] The conveying mechanism 3 in this embodiment is a roller conveyor 5. The roller conveyor 5 drives a plurality of rollers 7 by connecting sprockets provided on each roller 7 with a chain and rotating the connected chain with an actuator (not shown). Each roller 7 rotates counterclockwise as indicated by arrow r in FIG. 1, and the workpiece W is conveyed from right to left on the page in the direction indicated by arrow v.

[0024] As shown in FIG. 1, the shot mechanism 17 in this embodiment includes two mechanisms: a shot mechanism 17a that projects blast material S from above, and a shot mechanism 17b that projects blast material S from below, passing through the gap k between the rollers 7. The shot mechanism 17 may be an impeller-type shot mechanism or an air-type shot mechanism. The blow-off mechanism 21 includes a blow-off mechanism main body 21a having an internal space. Compressed gas is supplied into the blow-off mechanism main body 21a, and this compressed gas is sprayed from nozzles 21b formed in the blow-off mechanism main body 21a onto the transported workpiece W, blowing away the blast material S, dust, etc. from the workpiece W and leaving the workpiece W in a clean state.

[0025] As shown in FIG. 3, the blast material circulation mechanism 19 according to this embodiment includes a blast material recovery section 19a that recovers the blast material S that has been shot at the workpiece W from below the cabinet 2; a separation mechanism 19b that separates the blast material S from dust; and a blast material supply section 19c that supplies the blast material S from which dust has been separated back to the shot mechanism 17. As shown in FIG. 1, the recovered blast material S is supplied from the blast material supply section 19c to the shot mechanisms 17a and 17b via a hose 19d. The blast material recovery section 19a is configured, for example, by a screw conveyor or bucket elevator. The separation mechanism 19b can be selected from a sieve, an air sorter, a magnetic sorter, etc. The blast material supply section 19c may be configured by a chute, a screw conveyor, a gate, etc. Although not shown, the blasting device 1 is equipped with a dust collector, which circulates air within the cabinet 2 of the blasting device 1 to remove dust from within the cabinet 2.

[0026] As shown in Fig. 2, at least one end 9 of the roller 7 of the roller conveyor 5 of the blasting device 1 in this embodiment is provided with a guide portion 11 that guides the workpiece W toward the center of the roller 7 when the workpiece W moves to the end 9 of the roller 7. Fig. 5 is a perspective view of the guide portion 11 in this embodiment. As shown in Fig. 5, the guide portion 11 in this embodiment is an annular protrusion 13 that extends in the radial direction of the roller 7. The portion of the protrusion 13 on the side of the center of the roller 7 is formed as an inclined surface 13a that descends toward the center of the roller 7. 2, a receiving member 15 for preventing the workpiece W from falling is provided in the gap between at least one pair of rollers 7. In this embodiment, this receiving member 15 is a plate-like body having a plurality of openings 15.

[0027] Next, the operation of the blasting apparatus 1 configured as described above will be described. As shown in Fig. 1, when the blasting apparatus 1 is activated, the blasting material S is circulated by the blasting material circulation mechanism 19, and the blasting material S is projected from the shot mechanisms 17a and 17b. Compressed gas is sprayed from the nozzle 21b of the blow-down mechanism 21. Each roller 7 of the roller conveyor 5 rotates in the direction of the arrow r.

[0028] A workpiece W, such as a splice plate or gusset plate, is placed on the roller 7 on the right side of the blasting apparatus 1 in FIG. 1 during activation. The workpiece W is transported into the cabinet 2 as the roller 7 rotates. Inside the cabinet 2, the upper surface of the workpiece W is blasted by a shot mechanism 17a, which fires blast material S toward the upper surface of the workpiece W. Next, as the workpiece W is transported toward the left side of the drawing, the lower surface is blasted by a shot mechanism 17b, which fires blast material S toward the lower surface of the workpiece W through the gap k between the rollers 7. After blasting on both the upper and lower surfaces of the workpiece W, dust generated during the blasting process and the blast material remain on the upper surface of the workpiece W. The dust and blast material are transported to the blow-off mechanism 21 and blown away by compressed gas ejected from the nozzle 21a of the blow-off mechanism 21, leaving the workpiece W clean. Thereafter, the workpiece W is transported to the outside of the cabinet 2 on the left side of the drawing as the rollers 7 rotate, and a series of blasting processes on both the upper and lower surfaces of the workpiece W is completed.

[0029] Next, the operation of the guide unit 11 will be described. Figure 4 is an enlarged view of the main components of the roller conveyor 5. Figure 4 shows the workpiece W tilted relative to the conveying direction v during blasting due to pressure from above or below the projected shots, or a combination of these forces. The corner g of the workpiece W rides on the inclined surface 13a of the annular convex portion 13. In this state, the roller 7 rotates together with the annular convex portion 13, which serves as the guide unit, and the inclined surface 13a. Because the diameter of the inclined surface 13a is larger than the diameter of the center of the roller 7, the conveying speed R is faster than the conveying speed L of the center. As a result, the workpiece W is no longer tilted relative to the conveying direction, and is conveyed to the position indicated by the two-dot chain line W1. Thus, even if the workpiece W tilts relative to the conveying direction during blasting, the inclined surface 13a of the annular convex portion 13, which serves as the guide unit, corrects the conveying direction.

[0030] As described above, in the blasting device 1 of this embodiment, at least one end 9 of some or all of the rollers 7 of the roller conveyor 5 is provided with a guide portion 11 that guides the workpiece W toward the center of the roller 7 when the workpiece W moves to the end of the roller 7. Therefore, even if the workpiece W tilts with respect to the conveying direction, the workpiece W can be redirected to the normal conveying direction. This action prevents conveying problems such as the workpiece W being tilted and stuck in the conveying mechanism 3. In other words, this embodiment can provide a blasting device with a simple structure that prevents the workpiece from tilting with respect to the conveying direction during blasting.

[0031] Between the rollers 7 of the roller conveyor 5, receiving members 15 that prevent the workpieces W from falling are provided, so that the workpieces W can be prevented from falling through the gaps between the rollers 7. Because openings 15a are provided in the receiving members 15, the projection material S can be allowed to fall downward without remaining on the receiving members 15, allowing the projection material S to circulate. In this embodiment, the guide portion 11 is provided only at one end of the roller 7, but the present invention is not limited to this and the guide portion 11 may be provided at both ends of the roller 7.

[0032] (Variation) 6 to 8 show modified examples of the guide portion 11 provided at the end of the roller 7 according to the embodiment. The guide portion 11 in FIG. 6 is an annular protrusion 13 extending radially from the roller 7, and the portion of the protrusion 13 closest to the center of the roller 7 is a convex curved surface 13b that slopes downward toward the center of the roller 7. The guide portion 11 in FIG. 7 is an annular protrusion 13 extending radially from the roller 7, and the portion of the protrusion 13 closest to the center of the roller 7 is a concave curved surface 13c that slopes downward toward the center of the roller 7. The guide portion 11 in FIG. 8 is an annular protrusion 13 extending radially from the roller 7, and the portion of the protrusion 13 closest to the center of the roller 7 is an inclined surface 13d that slopes downward toward the center of the roller 7, and this inclined surface 13d has grooves or ridges 13e that extend radially from a fixed position on the central axis of the roller. The shape of each guide portion can be selected to be optimal based on the state of the blasting process and the properties of the workpiece W. [Explanation of symbols]

[0033] 1. Blasting equipment 3. Transport mechanism 5 Roller conveyor 7. Laura 9 Roller end 11 Guide section 13 Annular protrusion 15 Receiving member 13a, 13d sloped surface 13b Convex curved surface 13c Concave curved surface 13e Groove or ridge 15a opening k Gap between rollers S Projection material W Workpiece

Claims

1. A blasting processing device including a roller conveyor having a plurality of rollers as a transport mechanism for a workpiece, and a first shot mechanism for projecting blast material from below through gaps between the rollers of the roller conveyor, a guide portion is provided at least on one end of a part or all of the rollers of the roller conveyor, for guiding the workpiece, which has been lifted by the blasting process, toward the center of the roller when the workpiece moves to the end of the roller; The guide portion is an annular protrusion extending in the radial direction of the roller, a portion of the protrusion on the side of the center of the roller is an inclined surface that slopes downward toward the center of the roller, A blast processing device in which the workpiece transported on the side where the guide section is provided has its transport direction changed depending on the difference between the transport speed of the inclined surface and the transport speed of the central section.

2. A blasting processing device including a roller conveyor having a plurality of rollers as a transport mechanism for a workpiece, a first shot mechanism that projects blast material from below through gaps between the rollers of the roller conveyor, and a second shot mechanism that projects blast material from above, At least one end of some or all of the rollers of the roller conveyor is provided with a guide portion that guides the workpiece, which is transported at the end and has been lifted by the blasting process, toward the center of the roller when the workpiece moves to the end, a receiving member for preventing the workpiece from falling is provided in a gap between at least one pair of adjacent rollers of the roller conveyor, excluding the gap between the rollers through which the blast material blasted by the first shot mechanism passes; The receiving member is a plate-like body having a plurality of openings for allowing the blast material to fall therethrough.

3. The blasting device according to claim 2 , wherein the guide portion is an annular convex portion extending in a radial direction of the roller.

4. The blasting device according to claim 3 , wherein the portion of the convex portion on the side of the center of the roller is an inclined surface that slopes downward toward the center of the roller.

5. 4. The blasting device according to claim 1, wherein a portion of the convex portion on the side of the center of the roller is formed as a curved surface that curves downward toward the center of the roller.

6. The blasting device according to claim 1 or 4, wherein the inclined surface is formed with grooves or ridges extending radially from a fixed position on the central axis of the roller.

7. 5. The blasting processing device according to claim 1, wherein a receiving member for preventing the workpiece from falling is provided in a gap between at least one pair of adjacent rollers of the roller conveyor, excluding the gap between the rollers through which the blast material blasted by the first shot mechanism passes.

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