Abrasive material collection and discharge device

Abstract

To provide a grinding material collection and discharge device which can reduce a load on a worker collecting a grinding material.SOLUTION: A grinding material collection and discharge device 100 includes wheels 111 moving on a floor surface, a magnetic part 121 for collecting a grinding material, and a hopper part 131 for discharging a grinding material collected by the magnetic part 121, wherein a width length L1 of a range of the grinding material collected by the magnetic part 121 and a width length L2 of a range of the grinding material discharged by the hopper part 131, with a direction perpendicular to the direction of moving by the wheels 111 as a width direction, is L1>L2.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a cleaning material collection and discharge device that collects cleaning materials deposited on the floor surface of a work space and discharges them onto the floor surface of the work space in a state where they can be easily collected, particularly in the maintenance work of steel structures.

Background Art

[0002] Conventionally, preventive maintenance has been carried out on steel structures, whether newly installed or existing, to prevent the occurrence of rust and the like, or particularly in the case of existing steel structures, to renew the paint that has corroded due to aging deterioration. Since such preventive maintenance requires the removal of rust and the like and the removal of old paint films, in recent years, rust and paint films have been removed by blasting treatment (one type of derusting), and then new paint has been applied (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Under the above-described background circumstances, the conventional construction methods had the following problems. That is, in a curing space that is sheeted and sealed to prevent scaffolds from being assembled and dust from leaking, it becomes a dark place where light does not reach. When collecting cleaning materials in such a harsh environment, the work efficiency is poor and a large number of staff members are required. Furthermore, since the work of collecting the cleaning materials deposited on the floor surface is done in a bent posture, there is also a risk of leading to occupational diseases such as low back pain, and there was a problem that it was a very harsh working environment for the workers engaged in the work.

[0005] Therefore, the present invention aims to provide an abrasive material collection and discharge device that can reduce the burden on workers who collect abrasive materials. [Means for solving the problem]

[0006] The present invention relates to an abrasive material collection and discharge device that collects abrasive material projected onto the floor surface of a projection work space for the purpose of maintaining steel structures and accumulated on the floor surface by moving along the floor surface, and discharges the abrasive material collected in the device body onto the floor surface, wherein the device body comprises a moving means for moving along the floor surface, a collecting means for collecting abrasive material accumulated on the floor surface, and a discharge means for discharging the abrasive material collected by the collecting means onto the floor surface, wherein the direction perpendicular to the direction of movement by the moving means is defined as the width direction, the collecting means has the function of collecting abrasive material within a width length L1 from the abrasive material accumulated on the floor surface while the device body is moving, the discharge means has the function of discharging abrasive material onto the floor surface within a width length L2 while the device body is moving, and furthermore, the width length L1 and the width length L2 are L1 > L2.

[0007] Furthermore, in order to realize the above configuration, the abrasive material is magnetic, the collection means comprises a magnetic attachment section facing the floor surface and having the same width and length as L1, and a separation section for separating the abrasive material attached to the magnetic attachment section from the magnetic attachment section, and the discharge means comprises a hopper section into which the abrasive material separated by the separation section is fed, and the hopper section faces the floor surface and has a discharge opening with the same width and length as L2.

[0008] This configuration includes a function to gather the abrasive material accumulated on the floor surface of the projection workspace to a predetermined width and length L2 by moving the abrasive material collection and discharge device of the present invention. In other words, in the projection workspace, abrasive material is scattered haphazardly immediately after work. When workers collect this abrasive material, they collect the abrasive material that has been gathered to a width and length L2 after the abrasive material collection and discharge device has moved, which dramatically reduces the burden on the workers and also significantly shortens the overall work time. [Effects of the Invention]

[0009] The abrasive material collection and discharge device of the present invention can significantly reduce the burden on workers. [Brief explanation of the drawing]

[0010] [Figure 1] This is a flowchart showing the procedure for maintenance painting of a steel bridge according to the embodiment. [Figure 2] This is a schematic diagram illustrating a circulating blasting system. [Figure 3] This is a perspective view of the abrasive material collection and discharge device according to the embodiment. [Figure 4] This is a longitudinal cross-sectional view mainly showing the hopper section of an abrasive material collection and discharge device. [Figure 5] This is a schematic diagram illustrating the process by which the collected abrasive material is fed into the hopper section. [Figure 6] This is an explanatory diagram showing the operating status of the abrasive material collection and discharge device. [Modes for carrying out the invention]

[0011] The following describes in detail an embodiment of the abrasive material collection and discharge device according to the present invention. However, the present invention is not limited to the embodiments shown below, and design modifications can be made as appropriate.

[0012] First, let's explain an example of the maintenance painting procedure for steel bridges (steel structures). As shown in Figure 1, scaffolding is first erected on the steel bridge to be painted. At the same time, dustproof sheets are stretched to prevent dust from leaking outside, unpainted areas are protected, and preliminary preparations (S101) are made to install the equipment for blast treatment and shot peening.

[0013] Subsequently, the type and thickness of the old coating applied to the steel bridge, as well as the condition of the steel bridge, are investigated (S102). Based on the investigation results, the type of grit and shot to be used, the projection speed, etc., are determined. Here, the selected grit (non-spherical) and shot (spherical) are both magnetic iron (metallic) abrasive materials as specified in JIS Z 0310:2004.

[0014] Then, using the grit determined in S102, a blast treatment is performed first (S103). Specifically, the paint film to be removed from the steel bridge is removed and the surface is prepared. Although the removed paint film, rust, etc., and used grit are generated as dust during this blast treatment, since a dustproof sheet was installed in S101, the dust does not leak to the outside and accumulates at the work site.

[0015] Next, the blast device that projected the grid is loaded with the shot determined in S102 in place of the grid, making it ready to project the shot. This process constitutes the shot replacement process.

[0016] Then, the blast-treated areas where the surface has been exposed by the blast treatment are subjected to shot peening using the blast apparatus with the shots replaced (S104). This process constitutes step B, which improves the fatigue strength and stress corrosion cracking resistance of the surface. The used shots generated by the shot peening process are left at the work site and accumulate as dust, mixed with the used grit from S103. Incidentally, the shot peening process may be performed on all the surface areas that have undergone the blast treatment, or it may be performed partially as appropriate around welds or in areas where strength is a concern.

[0017] In addition, the blasting process in S103 and the shot peening process in S104 may be performed simultaneously. For the configuration in which the blasting process and the shot peening process are performed simultaneously, for example, the configuration disclosed in Japanese Patent Application Laid-Open No. 2018-118338 can be preferably applied.

[0018] Thereafter, the ground surface after the blasting process and the shot peening process is checked (S105). Such checking includes not only visual checking, but also, for example, comparison using an ISO8501 blasting photo album, roughness checking using a surface roughness measuring instrument, etc. By this, it is confirmed whether there is no remaining unpeeled coating film, whether the roughness of the ground surface is within the standard, etc., and appropriate treatment is performed on insufficient portions. For example, for portions where the blasting process cannot be performed, the ground is adjusted using hand tools or the like.

[0019] Final finishing painting for forming the final coating film is performed on the portion where the checking of the ground surface has been completed in this way (S106). Such painting is generally performed in multiple layers, for example, primer painting as anti-rust painting, intermediate painting for protecting the anti-rust painting, and topcoat painting as the final finishing painting.

[0020] When the painting is completed, its checking (S107) is performed. Such checking includes not only film thickness checking after the painting has dried, but also, for example, checking of the wet film thickness using a wetness gauge during the painting work. Also, such checking is performed not only after the topcoat painting which is the final finishing painting, but also during the primer painting and the intermediate painting.

[0021] When the painting work is completed by the checking, the site is cleaned up (S108). Specifically, scaffolds, dust sheets, etc. are collected, and the blasting-shot peening projection device is withdrawn to complete the maintenance painting.

[0022] In addition, a dust collection process is performed along with the above procedure (S110). Specifically, the used grit generated in the blasting process (S103), the used shots generated in the shot peening process (S104), and dust containing peeling material, rust, etc. generated in each process are collected while being separated.

[0023] Furthermore, since both the recovered used grit and used shot are iron (metallic) abrasive materials as specified in JIS Z 0310:2004, they do not break down like almandine garnet or steelmaking slag even when they collide with steel bridges during use, and are therefore reusable. In particular, those made from high-carbon cast steel can be reused about 600 times, making them very economical, and the amount of waste can be greatly reduced by separating them from peeled paint and other foreign materials.

[0024] The following description will explain a circulating blasting system 1 as an example, which can project both grit and shot using a common device, and can also collect and separate used grit, used shot, and peeled paint film, etc.

[0025] As shown in Figure 2, the blasting apparatus 1 includes a main unit 2 installed adjacent to the projection work space α of the steel bridge K to be worked on. Furthermore, the main unit 2 is equipped with a pressure hose 4, and a projector 3 is connected to the end of the pressure hose 4. Grit and shot are projected from the projector 3. The main unit 2 is also equipped with a suction hose 5, and the end of the suction hose 5 is positioned at the work site α. This allows dust consisting of used grit, used shot, and foreign matter including peeled paint and rust generated in the projection work space α to be sucked up via the suction hose 5. In addition, a dustproof sheet (not shown) is stretched over the projection work space α to prevent dust from leaking to the outside, and blowers and dust collectors are also installed as appropriate.

[0026] As shown in Figure 2, the main body 2 of the blasting apparatus 1 has a grid hopper tank 10 and a shot hopper tank 20 arranged adjacent to each other. More specifically, the grid hopper tank 10 has the function of storing grid and used grid (hereinafter, a mixture of these will be referred to as grid). The shot hopper tank 20 has the function of storing shot and used shot (hereinafter, a mixture of these will be referred to as shot). Furthermore, the grid hopper tank 10 is connected to a grid pressurizing tank 11 for pressurizing the grid stored in the grid hopper tank 10 to the work site α. Similarly, the shot hopper tank 20 is connected to a shot pressurizing tank 21 for pressurizing the shot stored in the shot hopper tank 20 to the projection work space α.

[0027] Furthermore, a dry compressed air supply means 30 is connected to the grid pressurizing tank 11 and the shot pressurizing tank 21 via a dry compressed air pipe 31. This dry compressed air supply means 30 consists of an air compressor and an air dryer for supplying dry compressed air. The dry compressed air pipe 31 is also equipped with a switching valve 32, which allows dry compressed air to be selectively supplied to the grid pressurizing tank 11 or the shot pressurizing tank 21, and allows shot to be loaded in place of grid for projection.

[0028] Furthermore, the pressure hose 4 is connected to the grit pressure tank 11 and the shot pressure tank 21. With this configuration, the air pressure from the dry compressed air supplied from the dry compressed air supply means 30 causes the grit or shot to be projected from the projector 3 via the pressure hose 4, enabling blast treatment or shot peening treatment to be performed on the steel bridge K to be worked on. The blast device 1 with the functions described above constitutes the projection device (blast-shot peening projection device) according to this embodiment.

[0029] The dust, including foreign matter such as used grit, used shots, and peeled paint, that has accumulated in the projection workspace α is collected and sucked up from one end of the suction hose 5. The dust sucked up by the suction hose 5 then reaches the sorting room 40.

[0030] Furthermore, a dust hose 51 is attached to the sorting chamber 40, and a dust collection unit 50, which serves as a peeled coating collection unit, is connected to the dust hose 51. In addition, an air suction device 60, which serves as a dust suction means, is connected to the dust collection unit 50. Therefore, the dust can be sucked up by the air suction force of the air suction device 60.

[0031] In the sorting chamber 40, the dust can be separated into used grit, used shot, and foreign matter including peeled paint films using known technology. The separated used grit is returned to the grit hopper tank 10 located below the sorting chamber 40 and reused. Similarly, the used shot is returned to the shot hopper tank 20 located below the sorting chamber 40 and reused. In this way, the grit and shot can be continuously circulated and reused.

[0032] In the above-described embodiment, the design can be modified as appropriate. For example, the switching valve 32 may be installed within the work site α so that a worker H at the work site α can switch it, or it may be made remotely operable. Also, the dry compressed air supply means 30 may be provided separately for the grit pressurizing tank 11 and the shot pressurizing tank 21. Also, the pressure hose 4 may be divided into one for grit and one for shot. Similarly, the projector 3 may also be divided into one for grit and one for shot. Furthermore, the separation chamber 40 does not need to be placed directly above the grit hopper tank 10 and the shot hopper tank 20, and its position is not particularly limited. Also, each hopper tank 10, 20 may be airtight while communicating with the inside of the grit hopper tank 10 and the shot hopper tank 20, or a dedicated tank for temporarily storing grit or shot may be provided to supply grit and shot to each hopper tank 10, 20 at the desired timing. Furthermore, it is desirable to be able to supply new equipment if the amount of grit or shots in the blasting device 1 falls below a specified value. Also, the main body of the device 2 may be mounted on a vehicle, for example, so that it can be moved. Moreover, the maintenance painting method of this embodiment may be applied not only to the repainting of steel structures but also to newly constructed steel structures.

[0033] Next, the abrasive material collection and discharge device 100 of the present invention will be described. The abrasive material collection and discharge device 100 is used in the dust collection process of S110 in the above-described maintenance painting method.

[0034] The abrasive material collection and discharge device 100 is movable and travels on a predetermined floor surface. It has the function of collecting at least abrasive material from the dust accumulated on the floor surface in the projection work space α while moving along the floor surface, and discharging the collected abrasive material to the floor surface.

[0035] To elaborate further, the abrasive material collection and discharge device 100 comprises a device body 101 that includes a moving means 110 for moving (self-propelled) on the floor surface, a collection means 120 for collecting at least abrasive material contained in the dust, and a discharge means 130 for discharging at least abrasive material, as shown in Figure 3, etc.

[0036] The mobility device 110 is equipped with a pair of wheels 111, which constitute a front wheel and a rear wheel. The wheels 111 can be driven by a motor, which is a drive source not shown. Hereinafter, the direction of movement by the mobility device 110 will be described as the front-rear direction, and the direction perpendicular to the front-rear direction will be described as the width direction.

[0037] The collection means 120 includes a magnetic attachment part 121 pivotally supported on the side wall of the frame-shaped device body 101. Specifically, the magnetic attachment part 121 is rotatable around a rotation axis 125 along the width direction of the device body 101, and is a cylindrical shape with a width of length L1 and magnetic properties. When the magnetic attachment part 121 is pivotally supported, the lower end of the side surface of the magnetic attachment part 121 faces the floor surface. The collection means 120 also has a transmission mechanism (not shown) that, when the device body 101 moves and the wheels 111 rotate, the magnetic attachment part 121 rotates in the opposite direction to the rotation direction of the wheels 111. As will be described in detail later, the abrasive material accumulated in the projection work space α will magnetically adhere to the lower end of the side surface of the magnetic attachment part 121.

[0038] Furthermore, a plate-shaped separating section 122 is positioned facing the upper end of the side surface of the magnetic attachment section 121. More specifically, the lower edge of the separating section 122 is oriented in the width direction along the side surface of the magnetic attachment section 121, and the lower edge of the separating section 122 and the upper end of the magnetic attachment section 121 are in light contact. The upper edge of the separating section 122, which protrudes upward and rearward at a predetermined angle relative to the magnetic attachment section 121, is positioned above the hopper section 131, which will be described later. This separating section 122 has the function of separating dust containing abrasive material that has been magnetically attached to the rotating magnetic attachment section 121 from the magnetic attachment section 121.

[0039] As shown in FIG. 4 and the like, the discharging means 130 includes a hopper portion 131 having openings at both upper and lower ends and having a cylindrical shape. Further, as shown in FIG. 5, an upper opening portion 132 formed at the upper end portion of the hopper portion 131 is disposed immediately below the upper edge of the above-described separating portion 122. Further, at the lower end portion of the hopper portion 131, a discharge opening portion 133 facing the floor surface and having a width length L2 is formed. And, a relationship of L1 > L2 holds between the width length L1 in the magnetic adhesion portion 121 and the width length L2 in the discharge opening portion 133.

[0040] Next, a usage mode of the grinding material collecting and discharging device 100 will be described. When the grinding material collecting and discharging device 100 is moved on the floor surface of the projection work space α where the grinding material has accumulated, as shown in FIG. 6, at least the grinding material is magnetically adhered to the magnetic adhesion portion 121 within a range of the width length L1, and the magnetic adhesion portion 121 rotates to be collected into the apparatus main body 101.

[0041] Then, the grinding material magnetically adhered to the rotating magnetic adhesion portion 121 abuts against the lower edge of the separating portion 122 and is separated from the magnetic adhesion portion 121, and falls from the upper edge of the separating portion 122 into the hopper portion 131 along the plate surface of the separating portion 122.

[0042] The grinding material that has fallen into the hopper portion 131 descends along the inner peripheral surface of the hopper portion 131 and is discharged again onto the floor surface with a width length of L2 from the discharge opening portion 133 formed at the bottom. That is, as the grinding material collecting and discharging device 100 moves, the grinding material is collected within a range of the width length L1, and then the grinding material raked up on the floor surface within a range of the width length L2 (<L1) is discharged in a strip shape. For this reason, the operator may collect the raked-up grinding material with the suction hose 5. To repeat, conventionally, the operator manually raked up the dust including the abrasive material deposited over a wide range and then collected it with the suction hose 5. However, since at least the grinding material is raked up in a narrow width simply by moving the grinding material collecting and discharging device, the operator only needs to collect the raked-up grinding material with the suction hose 5. Thereby, the number of operators can be reduced and the working time can be significantly shortened.

[0043] Of course, the abrasive material collection and discharge device 100 may also have other functions not mentioned above.

[0044] The magnetic attachment section 121 may, for example, consist of a magnet placed inside an iron cylinder, and the magnet rotates in conjunction with the rotation of the wheel 111. In this configuration, as the magnet rotates, the abrasive material travels along the surface of the cylinder and is introduced into the main body 101 of the device. Furthermore, the magnetic attachment section 121 is not limited to these configurations and may, of course, consist of other configurations. [Explanation of symbols]

[0045] 100 Abrasive material collection and discharge device 101 Main unit of the device 110 Means of Transportation 111 Wheels 120 Collection methods 121 Magnetized part 122 Separation section 130 Means of discharge 131 Hopper section 132 Upper opening 133 Discharge opening

Claims

[Claim 1] Abrasive material collection and discharge device that collects magnetic abrasive material that has been projected onto the floor surface of the projection work space for the purpose of maintaining steel structures, by moving along the floor surface, and discharges the abrasive material collected in the device body onto the floor surface, thereby reducing the burden on workers when collecting the abrasive material with a suction hose within the projection work space, The device includes a main unit from which abrasive material is collected. The main body of the aforementioned device is A means of moving on the floor surface, A collection means for collecting abrasive material accumulated on the floor surface, A discharge means for discharging the abrasive material collected by the collection means from the main body of the device onto the floor surface, Equipped with, The direction perpendicular to the direction of movement by the aforementioned moving means is defined as the width direction. The collection means has the function of collecting abrasive material accumulated on the floor surface within a width and length L1 only when the main body of the device is moving. The discharge means has the function of discharging abrasive material onto the floor surface within a width and length L2 only when the main body of the device is moving. Furthermore, the width length L1 and the width length L2 are, L1 > L2 And, The aforementioned means of transport is equipped with wheels that can be driven by a power source, The aforementioned collection means is A magnetic attachment portion facing the floor surface and having the same width and length as L1, A separation unit for separating the abrasive material that has been magnetically attached to the magnetic attachment part from the magnetic attachment part, As the device body moves and the wheels rotate, the magnetic attachment part rotates in the opposite direction to the rotation of the wheels as well, according to the transmission mechanism. It is equipped with, The aforementioned discharge means is The hopper section into which the abrasive material separated by the separation section is fed is provided, and the hopper section faces the floor surface and has a discharge opening with the same width and length as L2. As the abrasive material is moved by the aforementioned moving means, it is magnetically attached to the magnetic attachment part within a width and length L1, and the magnetic attachment part rotates, causing the abrasive material to be collected inside the main body of the device. The collected abrasive material is then discharged onto the floor surface from the discharge opening in a strip shape within a width and length L2. By moving the main body of the device in a projection workspace where abrasive material is accumulated over an area wider than the width and length L1, The abrasive material is collected within the main body of the device within a width and length L1, and is scraped together and discharged in a strip-like manner from the discharge opening within a width and length L2, and the width and length L2 is such that an operator only needs to collect the abrasive material with a suction hose. Abrasive material collection and discharge device characterized by the following features.

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