JP5640533B2 - Gas blow device - Google Patents

Description

  The present invention relates to a gas blowing device that blows gas onto the surface of a workpiece processed by a shot blasting device.

  Conventionally, shot blasting is known as a technique for performing surface treatment of a workpiece such as a steel plate. In this shot blasting, burrs and scales formed on the surface of the workpiece are removed by colliding the shot grains (projection material) with the surface of the workpiece, surface grinding, and satin processing.

  By the way, in a shot blasting apparatus that performs such shot blasting, shot grains may remain on the surface of the workpiece discharged from the projection chamber. The shot grains remaining on the surface of the workpiece are, for example, between the lifting magnet and the workpiece when the workpiece is held by a lifting magnet of a pile crane provided downstream of the shot blasting device. There is a problem that the shot grains are sandwiched between the two and the surface of the workpiece is damaged by the shot grains.

  In order to solve such a problem, it has been proposed to provide a removal device for removing shot grains remaining on the surface of the workpiece on the downstream side of the shot blasting device (for example, Patent Document 1). In particular, in the removing device described in Patent Document 1, the surface of the workpiece is cleaned by a brush attached to a belt that rotates in a direction intersecting the conveyance direction of the workpiece.

JP 2009-154278 A

  However, in such a brush, there are cases where the remaining shot particles cannot be completely removed due to, for example, shot particles passing between the brush hairs. It is also possible to scrape off shot grains using a rubber curtain (scraper) instead of a brush. In this case, too, the shot grains pass under the scraper as in the case of using a brush. In some cases, the remaining shot grains cannot be completely removed.

  As another method, it is also conceivable to blow off shot grains on the surface of the workpiece by blowing air onto the surface of the workpiece using an air blowing device instead of a brush or a scraper. When such an air blowing device is used, it is necessary to blow a large amount of air on the surface of the workpiece when a large amount of shot grains are present on the surface of the workpiece. In order to completely remove the shot grains on the surface, it is necessary to blow high-pressure air on the surface of the workpiece.

  Therefore, in order to completely remove a large amount of shot grains existing on the surface of the workpiece, it is necessary to blow a large amount of air on the surface of the workpiece at a high pressure. However, in order to blow a large amount of air onto the surface of the workpiece at a high pressure by the air blowing device, a large-capacity compressor and tank are required, which not only increases the manufacturing cost and initial investment cost, A large amount of energy is required to drive the compressor, resulting in an increase in energy consumption and an increase in driving cost.

  Accordingly, in view of the above problems, an object of the present invention is to provide a gas blowing device that can more reliably remove shot grains remaining after shot blasting at low cost.

The present inventor has studied gas blow apparatuses having various configurations in consideration of manufacturing cost and driving cost regarding removal of shot grains remaining after shot blasting.
As a result, the gas blow device is divided into an upstream gas blow part and a downstream gas blow part, and the specifications differ between the upstream gas blow part and the downstream gas blow part, so that shot grains remaining after the shot blasting process can be ensured. It has been found that the manufacturing cost and the driving cost can be reduced while removing them.

  More specifically, by installing a high-pressure gas blow part with a low pressure on the upstream side and a high-pressure gas blow part with a low flow rate on the downstream side, most of the shot grains are removed by the upstream gas blow part, Thereafter, the remaining shot grains can be surely removed by the gas blow section on the downstream side. In addition, the initial investment cost and energy consumption can be reduced compared to the case where a single gas blowing device that blows a large amount of air onto the surface of the workpiece at high pressure is installed.

This invention was made | formed based on the said knowledge, and the summary is as follows.
(1) In a gas blowing device that is arranged on the downstream side of the shot blasting apparatus in the conveyance direction of the workpiece and blows gas to the workpiece processed by the shot blasting apparatus, a conveyance unit that conveys the workpiece; An upstream gas blow unit that blows gas onto the surface of the workpiece to be transported on the transport unit, and a downstream side in the transport direction from the upstream gas blow unit, and is transported more than the upstream gas blow unit A downstream gas blow unit that blows gas onto the surface of the workpiece conveyed on the conveyance unit on the downstream side in the direction, and jetting of the gas blown from the downstream gas blow unit onto the surface of the workpiece pressure, rather higher than the injection pressure of the gas blown from the upstream side gas blowing portion on the surface of the workpiece, the upstream gas-blowing unit, transportable of the workpiece Comprising an ejector capable of discharging a gas having a lower pressure and a higher flow rate than a plurality of introduced gases arranged side by side in a direction crossing the path, and the downstream gas blow section is a direction crossing the conveying path of the workpiece A gas blower comprising an air knife for ejecting a planar gas flow extending in the direction.

(2) injection flow rate of the upper Symbol upstream gas-blowing unit is blown onto the surface of the workpiece from the gas is greater than the injection flow rate of the gas blown from the downstream side gas-blowing section on the surface of the workpiece, the (1 ) Gas blow device described in the above.

  ADVANTAGE OF THE INVENTION According to this invention, the gas blow apparatus which can remove more reliably the shot grain which remains after shot blasting at low cost is provided.

It is a schematic plan view of the blasting equipment which comprises a gas blow device and a shot blasting device. It is the schematic side view of the blasting facility seen from the direction perpendicular | vertical with respect to the conveyance direction of a workpiece. It is a side view of the upstream gas blow part seen from the conveyance direction of the workpiece. It is a cross-sectional side view which shows the structure of an ejector roughly. It is a side view of the downstream gas blow part seen from the conveyance direction of the workpiece. It is the top view and sectional side view which show the structure of an air knife roughly.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the same reference numerals are assigned to similar components.

  First, with reference to FIG.1 and FIG.2, one embodiment of the gas blowing apparatus of this invention is described. FIG. 1 is a schematic plan view of a blasting facility including a gas blowing device and a shot blasting device according to the present invention, and FIG. 2 is a schematic side view of the blasting facility as viewed from a direction perpendicular to the conveying direction of a workpiece. FIG.

  As shown in FIGS. 1 and 2, the blasting facility 1 includes a conveying device 10 that conveys the workpiece W, a shot blasting device 20 that performs shot blasting, and a gas blowing device 30.

  The conveying device 10 includes a plurality of rollers 11 arranged in parallel with each other at a predetermined interval, a belt 13 that meshes with a wheel 12 provided at one end of the rollers 11, and a drive motor 14 that drives the belt 13. It has. In the transport apparatus 10 configured as described above, when the drive motor 14 is rotated, the belt 13 is driven by the drive motor 14, and as a result, each roller 11 is rotated. By the rotation of the roller 11, the workpiece W placed on the roller 11 is conveyed at a constant speed in the direction of arrow A in FIGS. Therefore, a conveying path for the workpiece W is formed above the roller 11.

  In the example shown in FIGS. 1 and 2, all the rollers 11 are connected to the belt 13, so that all the rollers 11 are driven to rotate. However, the rollers 11 may be driven at regular intervals, and the rollers 11 between the driven rollers 11 may be freely rotated, that is, not driven. In this case, the predetermined interval is set to be shorter than at least the length in the transport direction of the workpiece W to be transported.

  The shot blasting device 20 is placed on the conveying device 10 so as to traverse the conveying path of the workpiece W (particularly, in the embodiment shown in FIG. 1, it extends perpendicularly to the conveying direction of the workpiece W). Be placed. Further, as shown in FIG. 2, the shot blasting device 20 is shot toward the transport path of the workpiece W, more specifically toward the surface of the workpiece W being transported by the transport device 10. Perform grain projection. Since the shot grain is continuously projected in the direction crossing the conveying path of the workpiece W, the entire upper surface of the workpiece W that has passed through the shot blasting apparatus 20 is shot blasted.

  Note that the shot blasting apparatus 20 has the same configuration as that generally used, and various shot blasting apparatuses such as a mechanical type, a pneumatic type, and a wet type can be used. Further, the shot grains used in the shot blasting apparatus 20 can be of various sizes and materials, and are appropriately selected according to the material of the workpiece W or the like.

  Further, in the above embodiment, the shot blasting device 20 is provided only above the conveyance path of the workpiece W, but may be provided below the conveyance path of the workpiece W in addition to this. In this case, the upper and lower surfaces of the workpiece W are shot blasted.

  The gas blowing device 30 is provided on the downstream side of the shot blasting device 20 in the conveying direction of the workpiece W, and includes two gas blowing portions 31 and 41. Specifically, the gas blow unit 31 includes an upstream gas blow unit 31 and a downstream gas blow unit 41 provided on the downstream side of the upstream gas blow unit 31 in the conveyance direction of the workpiece W. These gas blow parts 31 and 41 are all arranged so as to cross the conveying path of the workpiece W. In particular, in this embodiment, the gas blow parts 31 and 41 extend in a direction perpendicular to the conveying direction of the workpiece W.

  The upstream gas blow section 31 includes an upstream header pipe 32 extending so as to cross the conveyance path of the workpiece W, and a plurality of the upstream gas blow sections 31 disposed below the upstream header pipe 32, that is, on the conveyance path side of the upstream header pipe 32. The ejector 33 is provided. In the present embodiment, the upstream header pipe 32 extends perpendicular to the conveying direction of the workpiece W. The upstream header pipe 32 is connected to the gas tank 50 via the gas supply pipe 34, and the gas tank 50 is connected to the compressor 52 via the gas supply pipe 51. A solenoid valve 35 is provided in the gas supply pipe 34 between the upstream header pipe 32 and the gas tank 50.

  As shown in FIGS. 1 and 3, the ejectors 33 are arranged at regular intervals in the longitudinal direction of the upstream header pipe 32. That is, the ejectors 33 are arranged at regular intervals in a direction crossing the conveyance path of the workpiece W. Each ejector 33 moves the gas supplied to the ejector 33 from the upstream header pipe 32 toward the transport path of the workpiece W, more specifically, on the surface of the workpiece W being transported by the transport device 10. Inject towards.

In particular, each ejector 33 injects gas so that the gas injected from each ejector 33 spreads toward the surface of the workpiece W, as indicated by X in FIGS. In the present embodiment, the gas injected from each ejector 33 flows toward the surface of the workpiece W in a direction opposite to the conveying direction of the workpiece W, that is, on the surface of the workpiece W. The gas is ejected from each ejector 33 such that the axis X _{1 of the} gas that spreads inwardly tilts in the direction opposite to the transport direction.

  FIG. 4 is a cross-sectional side view schematically showing the configuration of each ejector 33. As shown in FIG. 4, the ejector 33 includes a gas duct 33c extending between the gas suction port 33a and the gas discharge port 33b, and a compressed gas introduction port 33d provided in the gas duct 33c near the gas suction port 33a. . The gas duct 33c is provided with a throttle portion 33e, and its cross-sectional area gradually increases toward the gas discharge port 33b on the gas discharge port 33b side of the throttle portion 33e. The compressed gas inlet 33d is connected to the upstream header pipe 32.

  In the ejector 33 configured as described above, when high-pressure gas is supplied from the gas introduction port 33d, ambient gas is sucked from the gas suction port 33a. The gas supplied from the gas inlet 33d and the gas sucked from the gas inlet 33a are discharged from the gas outlet 33b through the gas duct 33c. Therefore, according to the ejector 33, by sucking the gas around the ejector 33, a gas having a lower pressure and a higher flow rate than the gas supplied from the gas introduction port 33d can be discharged from the gas discharge port 33b.

  Note that the ejector shown in FIG. 4 is an example, and an ejector having any configuration may be used as long as a gas having a lower pressure and a higher flow rate than the gas supplied to the ejector can be discharged by sucking the surrounding gas. .

  On the other hand, the downstream gas blow section 41 is disposed below the downstream header pipe 42 and the downstream header pipe 42, that is, on the conveyance path side of the downstream header pipe 42, extending so as to cross the conveyance path of the workpiece W. And an air knife 43. In the present embodiment, the downstream header pipe 42 also extends perpendicularly to the conveying direction of the workpiece W. The downstream header pipe 42 is connected to the gas tank 50 via the gas supply pipe 44. An electromagnetic valve 45 is provided in the gas supply pipe 44 between the downstream header pipe 42 and the gas tank 50.

  As shown in FIGS. 1 and 5, the air knife 43 has an elongated injection port that extends continuously in the longitudinal direction of the downstream header pipe 42. That is, the air knife 43 has an elongated injection port extending in a direction crossing the conveyance path of the workpiece W. The air knife 43 moves the gas supplied from the downstream header pipe 42 to the air knife 43 toward the conveyance path of the workpiece, more specifically toward the surface of the workpiece W being conveyed to the conveyance device 10. Spray.

  In particular, the air knife 43 injects a thin planar gas flow extending in a direction crossing the conveyance path of the workpiece W, as indicated by Y in FIGS. In particular, in this embodiment, the gas is injected from the air knife 43 so that the planar gas flow injected from the air knife 43 flows in the direction opposite to the conveying direction toward the surface of the workpiece W. . Moreover, in this embodiment, the air knife 43 injects a gas flow without a gap so as to cover the entire conveyance path from one edge of the conveyance path to the other edge in the direction crossing the conveyance path of the workpiece W. .

  In the present embodiment, the air knife 43 has an elongated injection port that extends continuously in the longitudinal direction of the downstream header pipe 42. However, the air knife may take any form as long as it can inject a planar gas flow by a mechanism in which one or a plurality of nozzles (or injection ports) are arranged on the same straight line. Therefore, the air knife may have a plurality of small holes arranged on the same straight line, for example.

  Alternatively, the air knife may have a plurality of nozzles 43 'having a shape as shown in FIG. Here, FIG. 6 is a view showing one nozzle 43 ′ for an air knife, FIG. 6 (A) is a plan view of the nozzle 43 ′, and FIG. 6 (B) is a sectional side view of the nozzle 43 ′. . As can be seen from FIG. 6, the nozzle 43 ′ includes a gas suction port 43 ′ a and a gas discharge port 43 ′ b that is longer than the gas suction port 43 ′ a. In the nozzle 43 ′ configured as described above, the gas supplied to the gas suction port 43 ′ a is ejected in a planar shape from the elongated gas discharge port 43 ′ b.

  In the blast equipment 1 configured as described above, first, the workpiece W is transported to the shot blasting apparatus 20 by the transport apparatus 10. The shot blasting apparatus 20 performs shot blasting by projecting shot grains onto the workpiece W. The workpiece W that has been shot blasted is moved in the transport direction A by the transport device 10 and transported to the gas blow device 30. In the gas blow device 30, first, gas is blown onto the surface of the workpiece W from the ejector 33 of the upstream gas blow unit 31 in a state where the workpiece W is moved in the conveyance direction A by the conveyance device 10. Most of the shot grains remaining on the surface of the workpiece W are removed. Next, gas is blown onto the surface of the workpiece W from the air knife 43 of the downstream gas blow unit 41 in a state where the workpiece W is moved in the conveyance direction A by the conveying device 10, thereby Shot grains remaining on the surface are almost completely removed.

  Here, in the embodiment of the present invention, the gas injection pressure (that is, the gas injection pressure from the ejector 33) sprayed from the upstream gas blow unit 31 onto the surface of the workpiece W is from the downstream gas blow unit 41. The pressure is lower than the spray pressure of the gas sprayed onto the surface of the workpiece W (that is, the spray pressure of the gas from the air knife 43). The injection flow rate of the gas blown from the upstream gas blow unit 31 onto the surface of the workpiece W (that is, the total injection flow rate of the gas from all the ejectors 33) is the surface of the workpiece W from the downstream gas blow unit 41. The injection flow rate of the gas blown upward (that is, the injection flow rate of the gas from the air knife 43) is increased.

  As described above, since the gas injection flow rate from the upstream gas blow unit 31 is large, most of the shot particles can be removed even when a large amount of shot grains remain on the surface of the workpiece W. However, since the gas injection pressure from the upstream gas blow unit 31 is not so high, a small amount of shot particles may remain on the surface of the workpiece W. On the other hand, when a small amount of shot grains remain on the surface of the workpiece W due to the high gas injection pressure from the downstream gas blow section 41, these shot grains can be removed almost completely.

  Therefore, according to the embodiment of the present invention, a large amount of shot grains remain on the surface of the workpiece W conveyed from the shot blasting apparatus 20 by performing the gas injection from the gas blowing apparatus in two stages. Even in this case, the shot grains can be almost completely removed.

  Here, when only the downstream gas blow part is provided without providing the upstream gas blow part (that is, when only one gas blow part is provided), a thin flat gas flow is generated when a large amount of shot grains remain. In some cases, the shot grains cannot be completely removed. In addition, if only the downstream gas blow section is used and the gas injection flow rate from the downstream gas blow section is further increased, high pressure gas is injected at a high pressure from the downstream gas blow section, which facilitates the removal of shot particles. can do. However, in this case (that is, when only one gas blow unit for injecting high-pressure and large-flow gas is provided), a large-capacity compressor or the like is required, resulting in an increase in production cost and operation cost. Therefore, in the embodiment of the present invention, it can be said that shot grains can be completely removed from the workpiece W while keeping the production cost and the operation cost low.

  In the above-described embodiment, one gas tank and one compressor are provided, and the injection pressure and the injection flow rate of the gas from each gas blowing unit are controlled by the electromagnetic valves 35 and 45. However, for example, two gas tanks for storing gases with different pressures may be provided and connected to each gas blow unit, or two compressors may be provided in addition to the gas tank to connect each gas blow unit. You may do it.

  In the above embodiment, the gas blowing device 30 is provided only above the conveyance path of the workpiece W. However, when the shot blasting device is also provided below the conveyance path, the gas blowing device may be provided above and below the conveyance path. In addition, air is preferably used as the gas blown to the workpiece W, but other gases may be used depending on the type of workpiece.

  Furthermore, in the said embodiment, the gas blow parts 31 and 41 are extended in the direction perpendicular | vertical with respect to the conveyance direction A of the workpiece W. As shown in FIG. However, the gas blowing units 31 and 41 may have any shape as long as they cross the conveyance path. For example, the gas blowing units 31 and 41 may be formed in a conveyance direction A by a predetermined angle in the plan view of FIG. Or may be V-shaped protruding in the direction opposite to the conveying direction of the workpiece W. As described above, when the gas blow unit is inclined with respect to the transport path, the shot particles are easily blown out of the transport path.

DESCRIPTION OF SYMBOLS 1 Blasting equipment 10 Conveying device 11 Roller 20 Shot blasting device 30 Gas blow device 31 Upstream gas blow unit 32 Upstream header pipe 33 Ejector 35 Solenoid valve 41 Downstream gas blow unit 42 Downstream header pipe 43 Air knife 45 Electromagnetic valve 50 Gas tank 52 Compressor W Work material

Claims (2)

In the gas blowing device that is disposed downstream of the shot blasting device in the conveyance direction of the workpiece, and blows gas to the workpiece processed by the shot blasting device,
A transport unit that transports the workpiece, an upstream gas blow unit that blows gas onto the surface of the workpiece transported on the transport unit, and a downstream side in the transport direction from the upstream gas blow unit And a downstream gas blow unit that blows gas onto the surface of the workpiece conveyed on the conveyance unit on the downstream side in the conveyance direction from the upstream gas blow unit,
Injection pressure of the gas blown onto the surface of the workpiece from the downstream gas-blowing portion, rather higher than the injection pressure of the gas blown from the upstream side gas blowing portion on the surface of the workpiece,
The upstream gas blow unit includes an ejector capable of discharging a gas having a lower pressure and a higher flow rate than the plurality of introduced gases arranged side by side in a direction crossing the conveyance path of the workpiece, and the downstream gas blow unit Is a gas blowing device comprising an air knife that ejects a planar gas flow extending in a direction transverse to the conveying path of the workpiece .   The gas blow flow rate according to claim 1, wherein an injection flow rate of the gas blown from the upstream gas blow unit onto the surface of the workpiece is higher than an injection flow rate of the gas blown from the downstream gas blow portion onto the surface of the workpiece. apparatus.

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