Recovery separation device and recovery separation system

Abstract

To provide a recovery separation device which separates a grinding material and powder dust from each other in a reliable manner to improve working efficiency and prevent increase of working time and costs, and to provide a recovery separation system.SOLUTION: A recovery separation device 2 includes a recovery tank 11 which may suction and recover a used grinding material and powder dust which occur in blast work. The recovery tank 11 has separating means which may separate the grinding material and the powder dust from each other. A two-tiered damper 31 is provided at the downstream side of the recovery tank 11, and a separator 51 is provided at the downstream side of the two-tiered damper 31 separately from the separating means of the recovery tank 2. The separator 51 mainly receives the grinding material flowing from the two-tiered damper 31, separates the grinding material and the powder dust from each other, and causes the separated grinding material to flow to a drum can 4. The structure separates the grinding material and the powder dust from each other in a reliable manner.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a recovery and separation device and a recovery and separation system used in a blasting operation. [Background technology]

[0002] Conventionally, the main purpose of blasting work is to treat the surface of an object (scrape, roughen, remove edges, etc.) by spraying a large number of abrasive materials onto the object using a blasting device.

[0003] Meanwhile, in order to improve durability, steel structures such as steel bridges, steel framed steel towers, and steel water gates are mainly painted on the steel surface with paint materials including waterproof and antiseptic paints. However, even if painted, deterioration over time such as rust, dirt, and peeling and flaking of the painted surface occurs. Therefore, when repainting, blasting work is sometimes performed to remove the old paint film. The blasting work scrapes off the old paint film, making it possible to prepare a base for the new paint material to be applied. On the other hand, the abrasives that are hit and the dust of the old paint film are scattered and scattered on the ground, so it becomes necessary to collect and separate them.

[0004] In recent years, therefore, blasting machines capable of performing collection work in addition to blasting work are sometimes used (for example, see Patent Document 1, etc.). With this device, scattered abrasives and dust from old coatings are sucked up with a hose, and the abrasives and dust are separated in a tank. The abrasives are then stored and made available for reuse. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2017-42854 A Summary of the Invention [Problem to be solved by the invention]

[0006] In the technology described in Patent Document 1, a single mesh screen for separation is provided in the collection tank. The abrasive material flows down through the holes in the screen, and dust is discharged from an outlet provided in the upper part of the collection tank.

[0007] However, there is a risk that some of the dust particles in the collection tank that is not sucked in by the negative pressure at the discharge port and that is equal to or smaller in size than the abrasives may pass through the holes in the screen.

[0008] The dust that flows down the screen is stored in a storage tank mixed with the abrasive, and if it is reused as is, it may cause equipment failure, etc. In addition, if blasting work is performed using abrasives mixed with dust, there is a concern that the dust ejected together with the abrasives may interfere with proper grinding, leading to a decrease in work efficiency.

[0009] Therefore, in the past, it was necessary to take the storage tank, which contains a mixture of abrasives and dust that could not be separated, home, remove the dust by washing the contents, etc., and then return only the abrasives to the storage tank before carrying out the blasting work. In this sense, there is a risk of an increase in work time and costs, and further improvement in work efficiency is desired.

[0010] The present invention has been made to solve the problems exemplified above, and its object is to provide a recovery and separation device and recovery and separation system that can reliably separate the sucked abrasive material and dust, thereby improving work efficiency and preventing an increase in work time and costs. [Means for solving the problem]

[0011] The following describes each of the means suitable for achieving the above objects. Note that, as necessary, the specific effects of the corresponding means will be added.

[0012] Means 1. Equipped with a recovery tank that can suck up and recover used abrasives and dust generated by blasting work, The recovery tank comprises: A suction port to which a suction hose can be connected; A separating means is provided in the recovery tank and is capable of separating the abrasive material from the dust; A negative pressure generated by a predetermined suction means is applied to the internal space of the recovery tank, A recovery and separation device having an exhaust port capable of exhausting the dust in the internal space of the recovery tank to the outside, A separator is provided downstream of a tank flow lower portion provided corresponding to a lower portion of the recovery tank, in addition to the separating means; The separator comprises: A recovery and separation device characterized by being configured to temporarily receive mainly the abrasive material flowing down from the lower flow section of the tank, and to separate the abrasive material from the dust, and to allow the separated abrasive material to flow down.

[0013] The abrasives and dust sucked into the collection tank through the suction hose and the suction port are separated by the separating means. The dust is then discharged to the outside through the outlet, and the abrasives flow down to the tank bottom. At this time, not all of the dust is necessarily discharged to the outside, and some of it may flow down to the tank bottom together with the abrasives. Here, in the means 1, a separator is provided downstream of the tank bottom, and the abrasives and dust are further separated by the separator. That is, the separation of the sucked abrasives and dust is performed not only by the separating means in the collection tank, but also by a separator provided corresponding to the bottom of the collection tank. Therefore, even if the abrasives and dust cannot be completely separated by the separating means on the upstream side, an opportunity to separate them again by the separator is obtained, and it is possible to reliably allow abrasives with higher purity to flow down. Therefore, the abrasives flowing down from the separator can be used as they are for blasting work, and appropriate grinding can be performed. Therefore, the work efficiency can be improved.

[0014] Finally, because the abrasives and dust are more reliably separated, there is no need to carry out the work of taking home the collection tank containing the abrasives and the unseparated dust and cleaning the contents, as was done in the past. This makes it possible to prevent increases in work time and costs.

[0015] In addition, even if the separating means in the collection tank stops functioning properly, a separate separator is provided so that the abrasives and dust can be separated. Therefore, the separator can be used to hedge against risk.

[0016] Means 2. The separating means in the recovery tank is A first screen having a mesh size larger than that of the abrasive material is provided. Inside the separator, The recovery and separation device described in Means 1 is characterized in that it is capable of separating the abrasive material and the dust, and is provided with a second mesh screen which is coarser than the abrasive material and finer than the first screen.

[0017] According to the second method, the first screen prevents the flow of relatively large dust particles, which are then discharged to the outside through the outlet. The second screen in the separator also prevents the flow of dust particles that have passed through the first screen. Therefore, when separating the abrasive material from the dust particles, the dust particles can be screened twice using each screen according to their size, which makes it possible to achieve more efficient separation.

[0018] In addition, even if the dust in the collection tank is not sucked in by the negative pressure at the discharge port and passes through the first screen, the second screen, which has a finer mesh than the first screen, can more reliably prevent the dust from passing through, thereby improving separation accuracy.

[0019] Means 3. The second screen is provided in an inclined state, The recovery and separation device according to Means 2, further comprising a vibrator for vibrating the second screen.

[0020] According to the third aspect, the second screen is inclined and vibrated by a vibrator, so that the abrasives and dust on the second screen are sifted while moving, without remaining in one place. This makes it possible to perform sifting quickly and efficiently, and shortens the time required for separation. In addition, because the second screen is inclined, it is possible to more actively guide the dust that does not pass through the holes of the second screen in the direction of the inclination.

[0021] Means 4. The recovery and separation device according to Means 3, characterized in that it is configured so as to be able to discharge to the outside the dust that does not pass through the second screen.

[0022] According to the fourth measure, the dust that did not pass through the second screen can be appropriately discharged to the outside. In other words, it is possible to prevent the dust from accumulating on the second screen. Therefore, it is possible to prevent the dust accumulated on the second screen from interfering with the screening of the abrasive and dust that newly flow down onto the second screen, which leads to a decrease in work efficiency.

[0023] Means 5. The separator comprises: 5. A recovery and separation device as described in any one of means 2 to 4, characterized in that it is provided with a dust collection port that can discharge the dust that has passed through the second screen to the outside by applying negative pressure.

[0024] According to the fifth method, the finer dust particles that pass through the second screen are discharged to the outside through the dust collection port. Therefore, the purity of the abrasive flowing down can be further increased. In addition, when separating the abrasive and the dust particles, the dust particles can be discharged twice using negative pressure, which allows for more reliable separation compared to the case of performing the separation once.

[0025] Means 6. The recovery and separation device according to Means 1, A stand on which the recovery and separation device can be detachably installed at a predetermined height; a storage container for storing the abrasive flowing down from the separator of the recovery and separation device.

[0026] According to the sixth aspect, since the recovery / separation device can be detached from the stand, the recovery / separation device can be stored and transported relatively easily even in a limited space such as the bed of a truck. Therefore, it is possible to improve the convenience when storing and transporting the recovery / separation device.

[0027] In addition, by installing the recovery and separation device on a stand and placing a storage container in advance at a position where the abrasive material flows down from the separator, the abrasive material can be automatically stored in the storage container when the recovery and separation device is operated.

[0028] Furthermore, the abrasive material stored in the storage container can be used directly for blasting work using a suitable blasting device, thereby further improving work efficiency.

[0029] Means 7. A cart on which the storage container is placed; The collection and separation system according to Means 6, further comprising a rail that enables the cart to move horizontally.

[0030] According to the seventh means, the storage container that has become heavy due to the abrasives stored therein can be moved relatively easily. In addition, by moving the heavy storage container to a position away from the recovery / separation device and then placing another storage container in a position where the abrasives flow down from the separator, it is not necessary to stop the operation of the recovery / separation device. Therefore, the work efficiency can be further improved. [Brief description of the drawings]

[0031] [Figure 1]FIG. 1 is a schematic diagram showing a schematic configuration of a recovery and separation system. [Diagram 2] FIG. 2 is a schematic diagram showing a schematic configuration of a recovery and separation device. [Diagram 3] 4 is a schematic cross-sectional view showing the state inside the recovery tank during operation of the recovery and separation device. FIG. [Figure 4] FIG. 2 is a cross-sectional schematic view showing a schematic configuration of a two-stage damper. [Diagram 5] 5A to 5C are schematic cross-sectional views showing the state inside the two-stage damper during operation of the recovery / separation device, where (a) shows a first state, (b) shows a second state, and (c) shows a third state. [Figure 6] 4 is a timing chart showing switching behavior of a first on-off valve and a second on-off valve over time. [Figure 7] FIG. 2 is a diagram showing a schematic configuration of a separator, where (a) is a schematic front view and (b) is a schematic side view. [Figure 8] FIG. 4 is a schematic cross-sectional view showing the state inside the separator during operation of the recovery and separation device. [Figure 9] 10 is a timing chart showing switching of a first on-off valve and a second on-off valve over time in another embodiment. [Figure 10] 10 is a timing chart showing switching of a first on-off valve and a second on-off valve over time in another embodiment. [Figure 11] FIG. 13 is a schematic diagram showing another embodiment using a blasting device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] Hereinafter, one embodiment will be described with reference to the drawings.

[0033] 1, the recovery and separation system 1 of this embodiment includes a recovery and separation device 2, a stand 3 for enabling the recovery and separation device 2 to be detachably installed at a predetermined height, and a drum 4 as a storage container for storing abrasive material BB (see FIG. 3, etc.) flowing down from the bottom of the recovery and separation device 2. The recovery and separation system 1 also includes a cart 5 on which the drum 4 is placed, and rails 6 that enable the cart 5 to move horizontally.

[0034] Furthermore, the recovery and separation system 1 of this embodiment includes a vacuum recovery device 7 as a suction means. The vacuum recovery device 7 includes a control panel, a cyclone, a first dust collector, a motor, and a HEPA filter (all not shown). The control panel includes a board for controlling the electrical operation of various devices. The control panel also includes a switch for starting and stopping the recovery operation, a notification lamp, and the like. Furthermore, the cyclone and the first dust collector are equipped with a function for separating the dust particles DL and DS (see FIG. 3, etc.) by centrifugal separation, and the cyclone and the first dust collector can be operated by a motor. In addition, the HEPA filter is provided to collect the dust particles DL and DS and to discharge relatively clean air to the outside of the vacuum recovery device 7.

[0035] Further, a second dust collector 8 is provided at a position different from that of the vacuum recovery device 7. The vacuum recovery device 7 and the second dust collector 8 are each connected to the recovery and separation device 2.

[0036] As shown in FIG. 2, the recovery and separation device 2 includes a recovery tank 11, a two-stage damper 31, and a separator 51.

[0037] First, the configuration of the recovery tank 11 will be described. As shown in FIG. 2 and FIG. 3, the recovery tank 11 is provided with a suction connection pipe 13. The suction hose 12 is connected to one end of the suction connection pipe 13, and the other end has a suction port 14 facing the internal space of the recovery tank 11. In addition, a collision plate 15, a first screen 16, and a partition plate 17 constituting a separation means capable of separating the abrasive material BB from the dust DL and DS are provided in the recovery tank 11. The first screen 16 has a mesh shape that is coarser than the abrasive material BB. In addition, the recovery tank 11 is provided with a discharge connection pipe 19 having a discharge port 18 at one end, and a discharge hose 20 is connected to the other end of the discharge connection pipe 19. The discharge hose 20 is connected to the above-mentioned vacuum recovery device 7.

[0038] By operating the vacuum recovery device 7, negative pressure is applied to the internal space of the recovery tank 11 through the discharge hose 20 and the discharge connection pipe 19 (discharge port 18). This allows suction from the tip of the suction hose 12, making it possible to recover the abrasives BB and dust DL and DS scattered on the ground. The abrasives BB and dust DL and DS sucked from the suction hose 12 are guided into the recovery tank 11 through the suction connection pipe 13 (suction port 14). Most of the abrasives BB and dust DL and DS guided into the recovery tank 11 collide with the collision plate 15, and the abrasives BB that have lost momentum due to the collision fall onto the first screen 16. The abrasives BB that fall toward the first screen 16 pass through the first screen 16 and flow down. On the other hand, most of the dust DL and DS are prevented from passing by the first screen 16, and are collected by negative pressure through the discharge connection pipe 19 (discharge port 18) and the discharge hose 20 to the vacuum recovery device 7. At this time, the presence of the partition plate 17 prevents the abrasive material BB from entering the discharge port 18. The dust DL and DS collected to the vacuum recovery device 7 are then further separated in the vacuum recovery device 7 according to various conditions such as the size and weight of the dust DL and DS. Although very small, some of the dust DL and DS may pass through the first screen 16 and flow down together with the abrasive material BB without being guided to the vacuum recovery device 7.

[0039] Next, the configuration of the two-stage damper 31 will be described. As shown in FIG. 4, the two-stage damper 31 includes a storage damper 32 and a connection damper 33 connected to the storage damper 32. Inside the storage damper 32, a tank flow lower portion 21 is located, which is provided at the bottom of the recovery tank 11, has an inverted cone shape, and opens downward. A first opening / closing valve 22 is provided at the bottom of the tank flow lower portion 21. Inside the connection damper 33, a storage damper flow lower portion 34 is located, which is provided at the bottom of the storage damper 32, has an inverted cone shape, and opens downward. A second opening / closing valve 35 is provided at the bottom of the storage damper flow lower portion 34.

[0040] 2, a first actuator 36 for opening and closing the first on-off valve 22 is provided outside the storage damper 32. A second actuator 37 for opening and closing the second on-off valve 35 is provided outside the connection damper 33. Both the first actuator 36 and the second actuator 37 are configured with air cylinders and are controlled by a control means (not shown). The control means may be provided in the control panel or may be provided separately.

[0041] Next, a description will be given of the state inside the two-stage damper 31 during operation of the recovery and separation device 2. The first on-off valve 22 and the second on-off valve 35 can be switched to any one of a first state, a second state, and a third state.

[0042] In the first state, as shown in Fig. 5(a), the control means controls the actuators 36, 37 so that both the first on-off valve 22 and the second on-off valve 35 are closed. In the first state, the first on-off valve 22 is closed, so that the abrasives BB and dust DL, DS flowing down from the first screen 16 are gradually stored in the collection tank 11 from the lower part of the tank flow lower part 21 (the upper surface of the first on-off valve 22). As described above, the dust DL, DS is limited to that which could not be separated by the first screen 16 in the collection tank 11, and therefore the amount of the dust DL, DS is extremely small compared to the amount of the abrasives BB.

[0043] 5(b), in the second state, the first on-off valve 22 is opened, and the actuators 36, 37 are controlled by the control means so that the second on-off valve 35 is maintained in a closed state. In the second state, since the first on-off valve 22 is opened, the abrasive material BB and dust DL, DS stored in the recovery tank 11 flow down from the tank flow lower portion 21 and are gradually stored in the storage damper 32 from the lower portion of the storage damper flow lower portion 34 (the upper surface of the second on-off valve 35).

[0044] In the third state, as shown in Fig. 5(c), the actuators 36, 37 are controlled by the control means so that the first on-off valve 22 is closed and the second on-off valve 35 is open. In the third state, since the first on-off valve 22 is closed, the abrasives BB and dust DL, DS flowing down from the first screen 16 are gradually stored in the collection tank 11 from the lower part of the tank flow lower part 21 (the upper surface of the first on-off valve 22) again. In addition, since the second on-off valve 35 is opened, the abrasives BB and dust DL, DS stored in the storage damper 32 flow down from the storage damper flow lower part 34 and are guided to the separator 51 below via the connection damper 33.

[0045] In this embodiment, the actuators 36, 37 are controlled in the order of the first state, the second state, the third state, and then the first state, and the control is repeated. More specifically, as shown in FIG. 6, the first state is maintained until a predetermined time (e.g., 5 seconds) has elapsed from time T0 when the first state in which both the first on-off valve 22 and the second on-off valve 35 are in a closed state. Then, at time T1 when the predetermined time has elapsed, the first on-off valve 22 is switched to an open state and the second on-off valve 35 is switched to a closed state. Thereafter, the second state is maintained until a predetermined time (e.g., 5 seconds) has elapsed. Then, at time T2 when the predetermined time has elapsed, the first on-off valve 22 is switched to a closed state and the second on-off valve 35 is switched to a third state in which the second on-off valve 35 is in an open state. Thereafter, the third state is maintained until a predetermined time (e.g., 5 seconds) has elapsed. Here, the predetermined time (5 seconds) during which the third state is maintained is a time sufficient for all the abrasive material BB stored in the storage damper 32 to flow down. Then, at time T3 when the predetermined time has elapsed, the first state is established again, and so on. The above control is repeated in this order.

[0046] Next, the configuration of the separator 51 will be described. As shown in Fig. 7(a) and (b), an inlet 52 connected to the connection damper 33 is provided at the top of the separator 51, and the separator 51 temporarily receives mainly the abrasive material BB flowing in from the inlet 52. A second screen 53 inclined downward is installed directly below the inlet 52. A vibrator 54 for vibrating the second screen 53 is attached to the lower side of the second screen 53. The second screen 53 has a mesh size that is coarser than the abrasive material BB and finer than the first screen 16, so that all the abrasive material BB falls downward through the meshes of the second screen 53 before reaching the downstream end of the second screen 53.

[0047] Further, a dust guide portion 55 is provided downstream of the downstream end portion of the second screen 53. A dust outlet 56 that guides dust to a garbage bag is provided downstream of the dust guide portion 55.

[0048] Further, below the second screen 53, a dust collection port 57 communicating with the outside of the separator 51 is provided. A dust collection connection pipe 58 is attached to the dust collection port 57, and a dust collection discharge hose 59 is connected to the dust collection connection pipe 58. The dust collection discharge hose 59 is connected to the second dust collector 8 described above.

[0049] Additionally, the lower wall surface within the separator 51 serves as an abrasive guide section 60 consisting of an inclined surface, and an outer vibrator 61 is provided below the abrasive guide section 60 (outside the separator 51) for vibrating the abrasive guide section 60. An abrasive discharge port 62 for guiding the abrasive BB to the outside (drum can 4) is provided downstream of the abrasive guide section 60.

[0050] Next, the state inside the separator 51 during operation of the recovery and separation device 2 will be described. During this operation, the second dust collector 8 also operates, and a slight negative pressure acts on the internal space of the separator 51 through the dust collection and discharge hose 59, the dust collection connection pipe 58, and the dust collection port 57. Now, during the period in the third state, as shown in FIG. 8(a), the abrasive material BB and the dust DL, DS fall from the storage damper flow lower part 34 of the two-stage damper 31 onto the second screen 53 through the inlet 52. Then, the vibrator 54 operates, vibrating the second screen 53. Coupled with this vibration, the abrasive material BB on the second screen 53 smoothly passes through the second screen 53 and flows down to the abrasive material guide part 60.

[0051] On the other hand, the dust (especially the large-sized dust DL) is prevented from passing by the second screen 53, which has a finer mesh than the first screen 16, and is guided to the dust guide section 55. However, only the dust DS smaller than the mesh of the second screen 53 passes through the second screen 53. As shown in FIG. 8(b), the small dust DS that passes through the second screen 53 is collected into the second dust collector 8 by the negative pressure through the dust collection port 57, the dust collection connection pipe 58, and the dust collection discharge hose 59. Meanwhile, the large-sized dust DL that is guided to the dust guide section 55 is discharged directly into a garbage bag through the dust discharge port 56.

[0052] Furthermore, the outer vibrator 61 operates to vibrate the abrasive guide section 60. Coupled with this vibration, the abrasive BB that has passed through the second screen 53 and fallen into the abrasive guide section 60 is smoothly guided into the drum 4 through the abrasive discharge port 62. When a predetermined amount of abrasive BB has accumulated in the drum 4, the recovery and separation device 2 is stopped once. Then, the dolly 5 on which the drum 4 is placed is moved along the rail 6, making it possible to remove the abrasive BB. It is also possible to prepare a separate drum and quickly replace the drum 4 without stopping the recovery and separation device 2.

[0053] As described above in detail, according to this embodiment, the abrasive BB and the dust DL, DS sucked into the recovery tank 11 through the suction hose 12 and the suction port 14 are separated by the collision plate 15, the first screen 16, the partition plate 17, etc. Then, the dust DL, DS are discharged to the outside through the discharge port 18, and the abrasive BB flows down to the tank lower flow section 21. At this time, not all the dust DL, DS is discharged to the outside, and some of the dust DL, DS may flow down together with the abrasive BB toward the storage damper lower flow section 34. Here, in this embodiment, a separator 51 is provided downstream of the storage damper lower flow section 34, and the separator 51 further separates the abrasive BB from the dust DL, DS. That is, the suctioned abrasive BB and the dust DL and DS are separated not only by the collision plate 15, the first screen 16, the partition plate 17, etc. in the recovery tank 11, but also by the separator 51 provided corresponding to the lower part of the recovery tank 11. Therefore, even if the abrasive BB and the dust DL and DS cannot be completely separated by the upstream collision plate 15, the first screen 16, the partition plate 17, etc., the separator 51 can provide an opportunity to separate them again, and it becomes possible to reliably flow down abrasive BB with a higher purity. Therefore, the abrasive BB flowing down from the separator 51 can be used as it is for the blasting work, and appropriate grinding can be performed. Therefore, the work efficiency can be improved.

[0054] And finally, because the abrasive BB and the dust DL and DS are more reliably separated, it is no longer necessary to carry out the work of taking home the recovery tank 11 containing the abrasive BB and the dust DL and DS that could not be separated, and cleaning the contents, as in the conventional method. Therefore, it is possible to prevent an increase in work time and costs.

[0055] In addition, even if the collision plate 15, the first screen 16, the partition plate 17, etc. in the collection tank 11 stop functioning properly, the separator 51 is provided, so it is possible to separate the abrasive material BB and the dust DL and DS. Therefore, the separator 51 can also be used to hedge risks.

[0056] Furthermore, in this embodiment, in addition to the first screen 16, a second screen 53 is provided, which has a mesh size coarser than the abrasive material BB and finer than the first screen 16. That is, when separating the abrasive material BB from the dust DL and DS, screening is performed twice using the screens 16 and 53 according to the size of the dust DL and DS, making it possible to achieve more efficient separation.

[0057] Furthermore, as in this embodiment, even if the dust DL in the collection tank 11 is not sucked in by the negative pressure at the discharge outlet 18 and passes through the first screen 16, the second screen 53, which has a finer mesh than the first screen 16, can more reliably prevent the dust DL from passing through, thereby improving the separation accuracy.

[0058] In addition, since the second screen 53 is provided in an inclined state and is vibrated by the vibrator 54, the abrasive material BB and dust DL, DS on the second screen 53 are sifted while moving, without remaining in one place. Therefore, sifting can be performed quickly and efficiently, and the time required for separation can be shortened. Also, since the second screen 53 is in an inclined state, it is possible to more actively guide large dust DL that does not pass through the holes of the second screen 53 in the inclined direction.

[0059] Furthermore, since a dust guide section 55 is provided in addition to the second screen 53 and the vibrator 54, the dust DL that did not pass through the second screen 53 can be appropriately discharged to the outside from the dust outlet 56. In other words, it is possible to prevent the dust DL (DS) from accumulating on the second screen 53. This makes it possible to prevent the dust DL (DS) accumulated on the second screen 53 from interfering with the screening of the abrasive material BB and the dust DL and DS that newly flow down onto the second screen 53, thereby preventing a decrease in work efficiency.

[0060] Furthermore, according to this embodiment, the smaller dust particles DS that have passed through the second screen 53 are discharged to the outside via the dust collection port 57. This makes it possible to further increase the purity of the abrasive material BB flowing down. Also, when separating the abrasive material BB from the dust particles DL and DS, the dust particles DL and DS can be discharged twice using negative pressure (once into the collection tank 11 and once into the separator 51), allowing for more reliable separation compared to the case of performing the separation once.

[0061] In addition, in this embodiment, since the recovery / separation device 2 is detachable from the stand 3, the recovery / separation device 2 and the like can be stored and transported relatively easily even in a limited space such as the bed of a truck. Therefore, it is possible to improve the convenience when storing and transporting the recovery / separation device 2 and the like.

[0062] In addition, by installing the recovery and separation device 2 on a stand 3 and placing a drum 4 in advance at a position where the abrasive material BB will flow down, the abrasive material BB can be automatically stored in the drum 4 when the recovery and separation device 2 is operated.

[0063] Furthermore, the abrasive material BB stored in the drum can 4 can be used directly for blasting work using a predetermined blasting device as needed, thereby further improving the work efficiency.

[0064] In addition, by providing the dolly 5 and rails 6, the drum can 4, which has become heavy as a result of storing the abrasive material BB, can be moved relatively easily. In addition, by moving the drum can 4, which has become heavy, to a position away from the recovery and separation device 2, and then placing another storage container in a position where the abrasive material BB flows down, it is not necessary to stop the operation of the recovery and separation device 2. Therefore, the work efficiency can be further improved.

[0065] In addition, in this embodiment, the first on-off valve 22 provided corresponding to the tank flow lower section 21 and the second on-off valve 35 provided corresponding to the storage damper flow lower section 34 are switched between open and closed states by a control means.

[0066] That is, in the first state, the first on-off valve 22 and the second on-off valve 35 are both in a closed state, in the second state, the first on-off valve 22 is in an open state and the second on-off valve 35 is in a closed state, and in the third state, the first on-off valve 22 is in a closed state and the second on-off valve 35 is in an open state. According to this embodiment, regardless of whether the first on-off valve 22 and the second on-off valve 35 are in the first state, the second state, or the third state, the inside of the recovery tank 11 can be maintained at a negative pressure while the space downstream of the second on-off valve 35 can be opened to the atmosphere, etc. That is, the recovery work can be performed continuously, and the workability can be improved.

[0067] In addition, the collected abrasive BB can be supplied from the collection tank 11 to the space downstream of the second on-off valve 35, separately from the blasting operation. In this sense, it is possible to improve the work efficiency and prevent an increase in work time and cost.

[0068] The present invention is not limited to the above-described embodiment, and may be implemented as follows: Of course, other applications and modifications not exemplified below are also possible.

[0069] (a) In the above embodiment, the vibrator 54 and the outer vibrator 61 are attached to the separator 51, but the number, positions, etc. are not particularly limited, and the installation itself may be omitted.

[0070] (b) In the above embodiment, a garbage bag is placed downstream of the dust discharge port 56 of the separator 51, but a separate container may be used, and the discharge destination is not particularly limited. Also, although the dust collection and discharge hose 59 of the separator 51 is connected to the second dust collector 8, it may be connected to, for example, the first dust collector of the vacuum recovery device 7 instead of the second dust collector 8.

[0071] (c) In the above embodiment, the actuators 36, 37 are controlled in the order of the state inside the two-stage damper 31, such as the first state, the second state, the third state, the first state, etc., but the order is not particularly limited. For example, as shown in Fig. 9, the actuators 36, 37 may be controlled so that the second state is set between time T11 and time T12, the first state is set between time T12 and time T13, and the third state is set between time T13 and time T14.

[0072] (d) In the above embodiment, with regard to the state within the two-stage damper 31 (switching of the first on-off valve 22 and the second on-off valve 35), the actuators 36, 37 are controlled so that the first state, the second state, and the third state each continue for five seconds, but this time is not particularly limited, and the time for each state may be different.

[0073] (e) In the above embodiment, the actuators 36, 37 are controlled based on the passage of time, but they may be controlled based on other indices, for example, the actual amount of storage. That is, when controlled by time, there are rare cases where concerns arise such as an excessive increase in the amount of storage due to variations in the amount of storage, or a loss in efficiency. Therefore, it is conceivable to control the actuators 36, 37 in response to the amount of storage, rather than by time.

[0074] More specifically, a first sensor capable of detecting first information on the amount of abrasive BB and dust DL, DS stored in the recovery tank 11, and a second sensor capable of detecting second information on the amount of abrasive BB and dust DL, DS stored in the storage damper 32 are provided. The control device determines whether the amount of abrasive BB stored in the recovery tank 11 is equal to or greater than a predetermined amount (threshold α) based on an input signal from the first sensor, and determines whether the amount of abrasive BB stored in the storage damper 32 is equal to or greater than a predetermined amount (threshold β) based on an input signal from the second sensor. The control device then controls the actuators 36, 37 based on the results of the determinations.

[0075] For example, as shown in Fig. 10, it is assumed that the first sensor is turned on at a timing T21 when the amount of the abrasive BB and the dust DL, DS in the collection tank 11 reaches a threshold value α. At this stage, each of the on-off valves 22, 35 is controlled from the first state to the second state, and the abrasive BB and the dust DL, DS flow down from the collection tank 11 into the storage damper 32. It is also assumed that the second sensor is turned on at a timing T22 when the amount of the abrasive BB and the dust DL, DS in the storage damper 32 reaches a threshold value β. At this stage, each of the on-off valves 22, 35 is controlled from the second state to the third state, and the abrasive BB and the dust DL, DS flow down from the storage damper 32 into the separator 51. In this way, each actuator 36, 37 is controlled according to the detected amount of abrasive material BB, etc., so even if there is variation from hour to hour in the amount of abrasive material BB, etc. recovered, the above-mentioned concerns can be eliminated and work efficiency can be further improved.

[0076] (f) In the recovery and separation system 1 of the above embodiment, the drum can 4 is provided as a storage container for storing the abrasive BB flowing down from the abrasive discharge port 62 of the separator 51, but other storage containers may be used. For example, as shown in FIG. 11, a blasting device 71 may be provided with a hopper section 72 as a storage container located directly below the recovery and separation device 2. In this case, the abrasive BB flowing down from the abrasive discharge port 62 of the separator 51 can be directly input into the hopper section 72 of the blasting device 71. As a result, the abrasive BB immediately after separation can be used for blasting work as it is, and the work efficiency can be further improved. In addition, in this case, the blasting work can be performed continuously for a long period of time.

[0077] (g) Although not specifically mentioned in the above embodiment, the inside of the storage damper 32 may be configured to be in a negative pressure state similar to that in the collection tank 11 during the first state. In this case, for example, it is conceivable to apply the negative pressure of the vacuum collection device 7 or the second dust collector 8 to the inside of the storage damper 32. By configuring as described above, the pressure in the collection tank 11 does not temporarily fluctuate when switching from the first state to the second state, and smooth and stable suction can be achieved.

[0078] (h) Although not specifically mentioned in the above embodiment for convenience, inspection windows may be provided in the collection tank 11, the storage damper 32, the connection damper 33, the separator 51, etc. This allows the amount of stored abrasive material BB and dust DL, DS to be grasped appropriately during operation of the collection and separation device 2, which in turn allows for early detection of problems such as variations in the amount of stored material, losses in efficiency, etc.

[0079] (i) In the above embodiment, the separating means is constituted by the collision plate 15, the first screen 16, and the partition plate 17, but one or two of these may be omitted.

[0080] (j) In the above embodiment, the first screen 16 and the second screen 53 were both made of mesh, but they may also be made of a metal plate having a large number of holes. [Explanation of symbols]

[0081] 1...recovery and separation system, 2...recovery and separation device, 3...frame, 4...drum as storage container, 5...cart, 6...rail, 7...vacuum recovery device as suction means, 11...recovery tank, 12...suction hose, 14...suction port, 15...collision plate constituting the sorting means, 16...first screen constituting the sorting means, 17...partition plate constituting the sorting means, 18...discharge outlet, 21...tank flow lower part, 51...separator, 53...second screen, 54...vibrator, 57...dust collection port, 72...hopper part as storage container, BB...abrasive, DL...dust, DS...dust.

Claims

1. Equipped with a recovery tank that can suck up and recover used abrasives and dust generated by blasting work, The recovery tank comprises: A suction port to which a suction hose can be connected; A separating means is provided in the recovery tank and is capable of separating the abrasive material from the dust; A negative pressure generated by a predetermined suction means is applied to the internal space of the recovery tank, A recovery and separation device having an exhaust port capable of exhausting the dust in the internal space of the recovery tank to the outside, A separator is provided downstream of a tank flow lower portion provided corresponding to a lower portion of the recovery tank, in addition to the separating means; The separator comprises: A recovery and separation device characterized by being configured to temporarily receive mainly the abrasive material flowing down from the lower flow section of the tank, and to separate the abrasive material from the dust, and to allow the separated abrasive material to flow down.

2. The separating means in the recovery tank comprises: A first screen having a mesh size larger than that of the abrasive material is provided, Inside the separator, The recovery and separation device according to claim 1, characterized in that a second mesh screen is provided which is capable of separating the abrasive material and the dust, and which has a coarser mesh than the abrasive material and a finer mesh than the first screen.

3. The second screen is provided in an inclined state, 3. The recovery and separation device according to claim 2, further comprising a vibrator for vibrating the second screen.

4. 4. The recovery and separation device according to claim 3, characterized in that the dust which does not pass through the second screen can be discharged to the outside.

5. The separator is 5. The recovery and separation device according to claim 2, further comprising a dust collection port capable of discharging the dust that has passed through the second screen to the outside by applying negative pressure thereto.

6. The recovery and separation device according to claim 1 ; A stand on which the recovery and separation device can be detachably installed at a predetermined height; a storage container for storing the abrasive flowing down from the separator of the recovery and separation device.

7. A cart on which the storage container is placed; The collection and separation system according to claim 6, further comprising a rail that enables the dolly to move horizontally.

Images