JP2014094412A - Shot treatment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a shot treatment device capable of reducing noise during shot treatment.SOLUTION: A cover case 80 is provided in an intake/exhaust unit 18 and an outer peripheral part of a roots blower 82 is covered by the cover case 80. An outer air introduction port 94 is formed at the cover case 80, and an air supply passage 96 for supplying outer air from the outer air introduction port 94 to the roots blower 82 side is provided in the cover case 80. A silencer 102 and a sound absorber 100 are provided at the air supply passage 96 in the cover case 80. The silencer 102 and the sound absorber 100 reduce operation sound of the roots blower 82 which are transmitted from the interior of the cover case 80 to the exterior of the cover case 80 passing through the outer air introduction port 94.

Description

  The present invention relates to a shot processing apparatus that projects a projection material onto an object to be processed and sucks air around a projection port.

  In some shot processing apparatuses, the apparatus is carried to a place where an object to be processed is arranged to perform shot processing (see, for example, Patent Document 1). In such a device, a projection chamber is not formed, and an intake / exhaust part is connected to the projector via a dust collecting part.

Utility Model Registration No. 3031304

  However, in this apparatus, since the suction blower operates in the intake / exhaust section, the noise in the intake / exhaust section is large, and there is room for improvement in terms of noise reduction during the shot processing operation.

  In view of the above fact, an object of the present invention is to provide a shot processing apparatus capable of reducing noise during shot processing.

  A shot processing apparatus according to a first aspect of the present invention includes a projection unit that projects a projection material from a projection port to an object to be processed, and the air that is connected to the projection unit and sucked from around the projection port. A dust collecting unit that collects and removes the dust, and an intake / exhaust unit that is connected to the dust collecting unit, sucks air around the projection port through the dust collecting unit by a suction blower, and discharges the air to the outside air, A cover case provided in the intake / exhaust portion and covering an outer peripheral portion of the suction blower and having an outside air inlet for introducing outside air, and a cover case provided in the cover case, from the outside air inlet to the suction blower An air supply passage for supplying outside air to the side, and an operation sound of the suction blower that is provided in the air supply passage and that extends from the inside of the cover case to the outside of the cover case through the outside air introduction port Mute hand And, with a.

  According to the shot processing device of the present invention described in claim 1, in the projection unit, the projection material is projected from the projection port to the object to be processed, and in the dust collecting unit connected to the projection unit, the projection port Dust in the air sucked from the surroundings is collected and removed. Moreover, in the intake / exhaust part connected to the dust collecting part, the air around the projection port is sucked through the dust collecting part by the suction blower and discharged to the outside air.

  Here, a cover case is provided in the intake / exhaust portion, and the outer peripheral portion of the suction blower is covered by this cover case, so that the operating noise of the suction blower is shielded by the cover case. On the other hand, simply covering the outer periphery of the suction blower with the cover case may be disadvantageous in that heat is applied to the inside of the cover case and the suction blower is not cooled. Since the introduction port is formed and an air supply passage for supplying outside air from the outside air introduction port to the suction blower side is provided inside the cover case, the suction blower is caused by the introduced outside air when the suction blower is operated. To be cooled. Further, when the outside air introduction port is formed, the operating sound of the suction blower is not partially shielded but leaks from the inside of the cover case through the outside air introduction port to the outside of the cover case. Since the silencer is provided in the air supply passage inside the case, the noise of the suction blower exerted from the inside of the cover case through the outside air inlet to the outside of the cover case is reduced by the silencer.

  According to a second aspect of the present invention, in the shot processing apparatus of the first aspect, a muffler is disposed in the exhaust passage of the intake / exhaust portion.

  According to the shot processing apparatus of the second aspect of the present invention, since the muffler is disposed in the exhaust passage of the intake / exhaust section, the exhaust noise accompanying the operation of the suction blower can be suppressed.

  According to a third aspect of the present invention, there is provided a shot processing apparatus according to the first or second aspect, wherein the projection processing unit and the dust collection unit, and the dust collection unit and the intake / exhaust unit are arranged. The space is detachably connected by a duct hose.

  According to the shot processing apparatus of the present invention described in claim 3, since the duct hose is connected between the projection unit and the dust collection unit and between the dust collection unit and the intake / exhaust unit, During work, the duct hose can separate the intake / exhaust portion from the work position for the shot processing. Then, by separating the intake / exhaust portion from the work position, noise near the work position during the shot processing work can be suppressed. Further, in order to sufficiently separate the intake / exhaust part from the working position, a long duct hose will be used, but in the present invention, the duct hose is detachable, so the projection part, In a state where the dust collection unit and the intake / exhaust unit are divided into three parts, these can be transported to the work site. For this reason, application of a long duct hose is easy.

  According to a fourth aspect of the present invention, there is provided the shot processing apparatus according to any one of the first to third aspects, wherein a duct disposed in the exhaust passage of the intake / exhaust portion is provided on the cover case. It is fixed on the upper surface in a lying position.

  According to the shot processing apparatus of the present invention as set forth in claim 4, since the duct disposed in the exhaust passage of the intake / exhaust portion is fixed to the upper surface of the cover case in a lying position, the height of the intake / exhaust portion is It can be suppressed. For this reason, it is possible to easily cope with the load limitation during transportation to the work site.

  A shot processing apparatus according to a fifth aspect of the present invention is the shot processing apparatus according to any one of the first to fourth aspects, wherein the projection portion includes a diffuser in which the projection port is formed at a tip portion. The diffuser is provided over the entire outer periphery of the diffuser, the base end is attached to the diffuser, the distal end is disposed with a gap between the diffuser, and the diffuser A blast head is provided that includes a collection hood in which a space formed therebetween communicates with the intake side of the dust collection unit, and a brush attached to the tip of the collection hood.

  A shot processing apparatus according to a sixth aspect of the present invention is the shot processing apparatus according to the fifth aspect, wherein a plurality of the blast heads are provided.

  A shot processing apparatus according to a seventh aspect of the present invention is the shot processing apparatus according to the second aspect, wherein the muffler is made of stainless steel.

  According to an eighth aspect of the present invention, there is provided the shot processing apparatus according to the third aspect, wherein the duct hose is made of soft vinyl chloride.

  According to a ninth aspect of the present invention, the shot processing apparatus of the present invention is arranged in the exhaust passage of the intake / exhaust section in the configuration according to any one of the first to third aspects, the seventh aspect, and the eighth aspect. The duct is upright.

  As described above, according to the shot processing apparatus of the present invention, there is an excellent effect that noise during work of shot processing can be reduced.

It is a front view showing the whole shot processing device composition concerning one embodiment of the present invention. 1 is a plan view showing an overall configuration of a shot processing apparatus according to an embodiment of the present invention. It is a front view which shows the state which fractured | ruptured the blast head of the shot processing apparatus which concerns on one Embodiment of this invention by the front-end | tip part side.

(Configuration of the embodiment)
A shot blasting apparatus as a shot processing apparatus according to an embodiment of the present invention will be described with reference to FIGS. Note that an arrow FR shown as appropriate in these drawings indicates the front side of the apparatus front view of FIG. 1, an arrow UP indicates the upper side of the apparatus, and an arrow LH indicates the left side of the apparatus front view of FIG. ing.

  FIG. 1 shows an overall configuration of the shot blasting apparatus 10 in a front view, and FIG. 2 shows an overall configuration of the shot blasting apparatus 10 in a plan view. The shot blasting apparatus 10 shown in these drawings is of a type that is transported to a place where an object to be processed 12 (see FIG. 1) is arranged and shot processing (abrasion processing) is performed manually or by a robot. The shot blasting apparatus has no projection chamber. Examples of the target object 12 (see FIG. 1) to be shot by the shot blasting apparatus 10 include large products such as bridge piers and oil tanks, and products that are difficult to transport.

  As shown in FIG. 1, the shot blasting device 10 includes a projection unit 14 as a projection unit shown on the left side in the figure, a dust collection unit 16 as a dust collection part shown in the center part in the figure, and a diagram. An intake / exhaust unit 18 is provided as an intake / exhaust section shown on the right side. The projection unit 14 and the dust collection unit 16 are detachably connected by a flexible vinyl chloride duct hose 20 having flexibility, and the dust collection unit 16 and the intake / exhaust unit 18 are It is detachably connected by a flexible vinyl chloride duct hose 22 having flexibility. A known joint structure is applied to the structure of these attachment / detachment portions.

  The projection unit 14 includes a unit substrate 24. The unit substrate 24 has a hole 24A for insertion of a fork of a forklift (not shown) (which is an element grasped as “conveying means” in a broad sense). Two are formed. Further, four support columns 25 are erected on the unit substrate 24, and a projection material tank 26 (shot tank) for storing the projection material is supported by these support columns 25. In the present embodiment, a ladder 110 is disposed on the side of the support column 25, and a platform 112 (see FIG. 2) is formed in the middle portion of the projection unit 14 in the vertical direction.

  As shown in FIG. 1, a pressurized tank 32 that can communicate with the projection material tank 26 is connected to the lower side of the projection material tank 26, and between the projection material tank 26 and the pressurized tank 32. A butterfly valve 28 and a poppet valve 30 are provided. The butterfly valve 28 is opened when the projection material is supplied. The poppet valve 30 is opened and closed according to the internal pressure in the pressurized tank 32, and closes when the projection material is sufficiently put in the pressurized tank 32 and pressurized. ing.

  A lower side of the pressurized tank 32 is connected to a blast hose 44 through a connection portion 33, and a ball valve 34 and a mixing valve 36 are provided in the connection portion 33. In the present embodiment, a plurality (two sets) of connecting portions 33 are provided in parallel, and the blast hoses 44 are connected in parallel to each connecting portion 33 so that the blast hoses 44 are connected in parallel (in FIG. A plurality (two sets) are provided so as to be aligned in the vertical direction. The ball valve 34 is used for adjusting the flow rate of the projection material (for limiting the supply amount). The mixing valve 36 is connected to an air supply unit 42 (air compressor, illustrated in a block form in the drawing) via a pipe 38A, an air dryer 40 (mounted on the dust collecting unit 16), and a pipe 38B. The projection material from the pressurized tank 32 side and the compressed air from the air supply unit 42 side are mixed.

  The blast hose 44 is arranged in parallel as described above, and is also arranged in series, and is connected in series via the blast hose joint 46. A blast head 50 (a projection nozzle with a recovery hood) is attached to the tip of the blast hose 44. That is, in this embodiment, a plurality of blast heads 50 are provided.

  In the shot blasting apparatus 10, when the projection unit 14 projects (injects) the projection material, mixing is performed in a state in which the projection material is sufficiently put in the pressure tank 32 and the pressure tank 32 is pressurized. Compressed air is supplied to the valve 36 side to open the mixing valve 36 and open the ball valve 34. In this case, the projection material that has passed through the ball valve 34 from the pressurized tank 32 side flows to the mixing valve 36, is accelerated by the compressed air, and passes through the blast hose 44, whereby the projection port 50G of the blast head 50 (see FIG. 3). Projecting material is projected onto the object 12 to be processed. Thereby, a blast process (abrasion process, shot process in a broad sense) is performed on the object 12 to be processed.

  FIG. 3 is a front view showing a state in which the blast head 50 is broken on the tip side. As shown in FIG. 3, the blast head 50 includes a connector 50A connected to the distal end portion of the blast hose 44, and the connector 50A is connected to the holder 50C. An annular packing 50B is disposed between the connector 50A and the holder 50C. A diffuser 50D having a projection port 50G formed at the tip is integrally attached to the lower side of the holder 50C, and a collection hood 50E is disposed over the entire periphery of the diffuser 50D. The recovery hood 50E is substantially Y-shaped when viewed from the front, and a base end 50E1 that is one upper end is mounted on the upper end side of the diffuser 50D, and a front end side (lower end side) is the base. The diameter of the diffuser 50D is larger than that of the end portion 50E1 and is disposed with a space between the front end portion side (lower end portion side) of the diffuser 50D. A recovery hose 52 is attached to the other upper end, and a space formed between the recovery hood 50E and the outer peripheral surface of the diffuser 50D leads to the intake side of the dust collection unit 16 (see FIG. 1). .

  Moreover, the brush 50F is attached to the lower end part of the collection | recovery hood 50E to the perimeter around the axis | shaft, The bristles of the brush 50F are extended along the axial direction of the diffuser 50D substantially. The brush 50F is used for sealing in order to prevent the projection material from leaking out of the blast head 50. Further, a gap is formed between the lower part of the collection hood 50E, the brush 50F, and the diffuser 50D, and the projection material reflecting the object 12 to be treated is sucked from the collection hood 50E to the collection hose 52. Thus, the interference between the projection materials can be suppressed. Note that arrows A1 and A2 in FIG. 3 indicate directions in which the projection material moves together with the compressed air, and arrows A3 to A6 indicate directions in which the projection material and the like are sucked.

  As shown in FIG. 1, the recovery hose 52 is arranged in parallel by being provided for each blast head 50 and is also arranged in series, and is connected in series via a recovery hose joint 54. Yes. Further, the recovery hoses 52 arranged in parallel are connected to the recovery hose junction pipe 56 so as to be integrated into the recovery hose 58. As shown in FIG. 2, the recovery hose 58 is connected to a joint part provided at the opening on the back side of the settling chamber 60 at the end opposite to the recovery hose merging pipe 56 side.

  The settling chamber 60 shown in FIG. 1 generates a classification flow to the air containing the projection material and dust sucked through the recovery hoses 52 and 58, and separates the particles in the sucked air. The suction force to the settling chamber 60 is generated by the operation of a roots blower 82 as a suction blower described later (mounted on the intake / exhaust unit 18). Further, the sucked dust is dust generated by projection. A rough receiving box (not shown) is disposed below the settling chamber 60, and the coarse powder separated by the settling chamber 60 enters the rough receiving box. The settling chamber 60 is connected in communication with the projection material tank 26, and the projectable projection material separated in the settling chamber 60 is collected into the projection material tank 26 and used again for projection. ing.

  A joint member 62 is attached to the front opening of the settling chamber 60. The joint member 62 is mounted by being pushed in and fitted with a joint portion provided at one end portion of the duct hose 20 (dust duct hose) described above. Further, the joint portion provided at the other end of the duct hose 20 is attached by being pushed into and fitted into the joint member 68 on the dust collector 70 side in the dust collection unit 16. The joint member 68 is attached to the opening on the side surface side of the dust collector 70.

  The dust collection unit 16 includes a unit substrate 64 on which the above-described air dryer 40 is mounted and fixed. The unit substrate 64 is formed with two holes 64A for inserting a fork of a forklift (not shown). Yes. Further, four support columns 66 are erected on the unit substrate 64, and the dust collector 70 is supported by these support columns 66. As described above, the dust collector 70 of the dust collection unit 16 is connected to the projection unit 14 by the duct hose 20, and filters the air sucked from the periphery of the projection port 50 </ b> G (see FIG. 3) of the blast head 50. It is designed to collect and remove dust in the air. A dust discharge gate 72 is provided on the lower side of the dust collector 70. The dust collector 70 discharges dust removed by filtration from the dust discharge gate 72 to a dust receiving box (not shown) and accumulates in the dust receiving box. It is supposed to let you.

  A joint member 74 is attached to the opening on the front side of the dust collector 70. The joint member 74 is mounted by being pushed in and fitted with a joint portion provided at one end of the duct hose 22 (filtered air duct hose). Further, the joint portion provided at the other end of the duct hose 22 is attached by being pushed into and fitted into the joint member 78 on the cover case 80 side in the intake / exhaust unit 18. The joint member 78 is attached to the upper opening on the front side of the cover case 80.

  The intake / exhaust unit 18 includes a unit substrate 76, and the unit substrate 76 is formed with two holes 76A for inserting a fork of a forklift (not shown). A roots blower 82 is fixedly disposed on the unit substrate 76. The roots blower 82 is connected to the drive motor 84 via the drive force transmission means, and is operable by the drive force of the drive motor 84.

  The outer periphery of the roots blower 82 is covered with a cover case 80. The cover case 80 provided in the intake / exhaust unit 18 is formed in a substantially rectangular box shape, and is fixed to the unit substrate 76 with the lower opening end side directed toward the upper surface side of the unit substrate 76. Inside the cover case 80, a suction duct 85 that communicates with the inside of the duct hose 22 extends toward the roots blower 82. An exhaust duct 88 </ b> A is disposed on the side of the roots blower 82. The exhaust duct 88 </ b> A is disposed on the most upstream side of the exhaust passage 86 and passes through the side wall of the cover case 80. The exhaust passage 86 of the intake / exhaust unit 18 is provided with a muffler 90 (silencer), an exhaust duct 88B, and a duct 92 with a backflow prevention damper described below, in addition to the exhaust duct 88A.

  The muffler 90 connected to the end of the exhaust duct 88A on the downstream side in the exhaust direction is made of stainless steel and includes a cylindrical muffler shell arranged so that the axial direction is the vertical direction of the apparatus, and both ends in the axial direction. Has a closed wall. An insertion hole is formed in the cylindrical wall on one end side (lower end side) of the muffler 90 in the axial direction, and the end portion of the exhaust duct 88A is inserted into this insertion hole. A muffler 90 having a known structure is formed inside the muffler 90. One end of the exhaust duct 88B is inserted into the closing wall on the other end side (upper end side) in the axial direction of the muffler 90, and one end side of the exhaust duct 88B is connected to the muffler 90.

  The exhaust duct 88B is a duct bent into a substantially L shape as a whole, and an intermediate portion is an R-shaped bent portion. The exhaust duct 88B is arranged so that the axial direction of the end on the muffler 90 side is the vertical direction of the apparatus, and the axial direction of the end opposite to the muffler 90 side is the horizontal direction (the horizontal direction of the apparatus). It is arranged to be. The end of the exhaust duct 88B opposite to the muffler 90 is connected to one end of the duct 92 with a backflow prevention damper.

  The duct 92 with the backflow prevention damper is fixed in an inclined position on the upper surface 80A (top surface of the top plate) of the cover case 80, and is used for discharging to the outside air. The discharge port of the duct 92 with the backflow prevention damper is provided with a backflow prevention damper (an element understood as “backflow prevention means” in a broad sense) (not shown). The backflow prevention damper is pivotally supported on the inside of the duct at the discharge port of the duct 92 with backflow prevention damper, and is evacuated by a cover that is closed by a biasing force of a spring (biasing means) (not shown) and its own weight. Other than the above, it is arranged at a position to close the discharge port. In the present embodiment, the duct 92 with the backflow prevention damper is fixed in a sideways posture, but as an alternative, the exhaust duct 88B and the duct 92 with the backflow prevention damper may be standing upright.

  With the configuration described above, the intake / exhaust unit 18 is connected to the dust collection unit 16, and sucks air around the projection port 50 </ b> G (see FIG. 3) of the blast head 50 through the dust collection unit 16 by the roots blower 82. The air is discharged to the outside air. The air sucked into the intake / exhaust unit 18 is air in which dust is filtered by the dust collection unit 16.

  On the other hand, outside air introduction ports 94 for introducing outside air are formed on the front side and the back side of the cover case 80. Corresponding to the outside air inlet 94, a grill 95 is attached to the outside of the cover case 80. The grill 95 includes a frame portion that is slightly larger than the outside air introduction port 94 and includes a plurality of crosspieces arranged in the same direction in the frame portion. Corresponding to the outside air introduction port 94, an air supply passage 96 for supplying outside air from the outside air introduction port 94 to the roots blower 82 side is formed inside the cover case 80.

  The air supply passage 96 includes an introduction duct 98 having one end connected to the outside air introduction port 94. Although not shown in the drawing, the introduction duct 98 is a duct bent into a substantially L shape as a whole, and an intermediate portion is an R-shaped bent portion. The introduction duct 98 is arranged so that the axial direction of the end portion on the outside air introduction port 94 side is the horizontal direction (direction perpendicular to the paper surface), and the shaft of the end portion on the opposite side to the outside air introduction port 94 side. It arrange | positions so that a direction may turn into an apparatus up-down direction. On the inner wall surface of the introduction duct 98, a sound absorbing material 100 as a sound deadening means having sound absorbing characteristics is attached. As the sound absorbing material 100, for example, a porous sound absorbing material such as urethane foam is applied.

  In addition, one end portion side (the left side in the figure) of the silencer 102 as a silencer is connected to the end portion of the introduction duct 98 opposite to the outside air introduction port 94 side. The silencer 102 constitutes a part of the air supply passage 96 and includes a cylindrical shell disposed so that the axial direction is the horizontal direction (the left-right direction of the apparatus), and also includes closing walls at both ends in the axial direction. The end of the introduction duct 98 is inserted into an insertion hole formed in the lower portion of the cylindrical wall on the one end side (left side in the figure) in the axial direction. A known silencer structure is provided inside the silencer 102. One end (upper end) in the axial direction of the duct 104 constituting a part of the air supply passage 96 is inserted into the insertion hole formed in the lower portion of the cylinder wall on the other end side (right side in the drawing) of the silencer 102. Is inserted, and the duct 104 is connected to the silencer 102. The duct 104 is arranged such that its axial direction is the vertical direction of the apparatus. An opening end of the duct 104 opposite to the silencer 102 side is disposed in the vicinity of the roots blower 82 (obliquely upper side).

  The sound absorbing material 100 and the silencer 102 provided in the air supply passage 96 have a function of reducing the operating noise of the roots blower 82 that extends from the inside of the cover case 80 through the outside air introduction port 94 to the outside of the cover case 80. .

  In the present embodiment, a ventilation window (not shown) is formed in the upper portion of the side wall of the cover case 80 (the upper right side portion in FIG. 1), and the ventilation fan 106 is disposed corresponding to the ventilation window. Further, a control panel 108 placed and fixed on the unit substrate 76 is disposed on the side of the cover case 80.

(Operation and effect of the embodiment)
Next, the operation and effect of the above embodiment will be described.

  In the projection unit 14 shown in FIG. 1, the projection material is projected from the projection port 50 </ b> G (see FIG. 3) of the blast head 50 onto the object 12 to be processed. As shown in FIG. 3, when the projection material is projected from the projection port 50G of the blast head 50 (see arrow A2), the projection material reflects the object 12 to be processed (see arrows A3 and A4). At this time, the projection material is prevented from leaking out by the brush 50F. Then, the projection material, the dust separated from the object 12 to be processed, and the like are sucked from the collection hood 50E to the collection hose 52 (see arrows A5 and A6). In the dust collection unit 16 connected to the projection unit 14 shown in FIG. 1, dust in the air sucked from around the projection port 50 </ b> G (see FIG. 3) of the blast head 50 is collected and removed. Further, in the intake / exhaust unit 18 connected to the dust collection unit 16, air around the projection port 50 </ b> G (see FIG. 3) of the blast head 50 is sucked by the roots blower 82 through the dust collection unit 16. To discharge.

  Here, the intake / exhaust unit 18 is provided with a cover case 80, and the outer periphery of the roots blower 82 is covered by the cover case 80. For this reason, the operating sound of the roots blower 82 is shielded by the cover case 80.

  On the other hand, simply covering the outer periphery of the Roots blower 82 with the cover case 80 may cause a disadvantage that the heat is generated inside the cover case 80 and the Roots blower 82 is not cooled. An outside air introduction port 94 for introduction is formed, and an air supply passage 96 for supplying outside air from the outside air introduction port 94 to the roots blower 82 side is provided inside the cover case 80. Therefore, when the roots blower 82 is in operation, The roots blower 82 is cooled by the introduced outside air.

  Further, when the outside air introduction port 94 is formed, the operating sound of the roots blower 82 is not partially shielded but leaks from the inside of the cover case 80 to the outside of the cover case 80 through the outside air introduction port 94. In the embodiment, since the sound absorbing material 100 and the silencer 102 are provided in the air supply passage 96 inside the cover case 80, the roots blower extending from the inside of the cover case 80 to the outside of the cover case 80 through the outside air inlet 94. The operation sound 82 is reduced by the silencer 102 and the sound absorbing material 100. In addition, the ventilation sound of the air supply passage 96 is also reduced.

  Further, since the muffler 90 is disposed in the exhaust passage 86 of the intake / exhaust unit 18, the exhaust noise accompanying the operation of the roots blower 82 is suppressed.

  In the shot blasting apparatus 10 according to the present embodiment, the projection units 14 and the dust collection unit 16 and the dust collection unit 16 and the intake / exhaust unit 18 are connected by duct hoses 20 and 22. For this reason, during the work of shot blasting, it becomes possible to separate the intake / exhaust unit 18 from the position of the operator or the like holding the blast head 50 by the duct hoses 20 and 22, and to separate the intake / exhaust unit 18 from the work position. Thus, noise near the work position during work of shot blasting can be suppressed.

  To explain supplementarily, for example, by increasing the length of the blast hose 44 or increasing the number of blast hoses 44 connected in series by the blast hose joint 46, the working position of the shot blasting process and the intake / exhaust unit 18 can be reduced. In this case, the shot blast injection force may be weakened. Therefore, it is preferable to adopt a configuration in which the intake / exhaust unit 18 is separated from the work position of the shot blasting process by the duct hoses 20 and 22 as in the present embodiment.

  Further, in order to sufficiently separate the intake / exhaust unit 18 from the working position, long duct hoses 20 and 22 are used. However, in this embodiment, the duct hoses 20 and 22 are detachable. With the duct hoses 20 and 22 removed and the projection unit 14, the dust collection unit 16, and the intake / exhaust unit 18 divided into three parts, these can be transported to the work site. For this reason, for example, compared with the apparatus with which the duct hose is fixed so that attachment or detachment is impossible, application of long duct hoses 20 and 22 is easy.

  As described above, according to the shot blasting apparatus 10 according to the present embodiment, noise during the work of the shot blasting process can be reduced.

  Further, in the shot blasting apparatus 10 according to the present embodiment, the duct 92 with the backflow prevention damper disposed in the exhaust passage 86 of the intake / exhaust unit 18 is fixed to the upper surface 80A of the cover case 80 in a lying position, so The height of the exhaust unit 18 is suppressed. For this reason, it is possible to easily cope with the load limitation during transportation to the work site.

(Supplementary explanation of the embodiment)
In the above embodiment, the roots blower 82 is applied as the suction blower. However, the suction blower may be another suction blower such as a centrifugal blower.

  Moreover, in the said embodiment, the sound-absorbing material 100 and the silencer 102 are provided in the air supply passage 96 as a silencer, and such a configuration is preferable from the viewpoint of more effectively reducing the operating sound of the roots blower 82. The silencer provided in the air supply passage may be, for example, only the sound absorbing material 100 or only the silencer 102.

  Moreover, in the said embodiment, the muffler 90 is arrange | positioned in the exhaust passage 86 of the intake / exhaust unit 18, and such a structure is preferable from a viewpoint of reducing more effectively the exhaust sound at the time of the work of shot blasting. However, it is also possible to adopt a configuration in which the muffler is not disposed in the exhaust passage of the intake / exhaust section. In this case, a sound absorbing material may be affixed to the inner wall surface of the exhaust duct disposed in place of the muffler 90.

  In the above-described embodiment, the projection unit 14 and the dust collection unit 16 and the dust collection unit 16 and the intake / exhaust unit 18 are detachably connected by the duct hoses 20 and 22. Such a configuration is preferable from the viewpoint of sufficiently separating 18 from the work position and the portability, but such a configuration may not be applied to the shot processing apparatus. That is, the connecting means for connecting one or both of the projection unit and the dust collection unit and between the dust collection unit and the intake / exhaust unit may be a duct other than the duct hose, etc. It may be a duct (including a duct hose) that fixedly connects either or both. For example, the projection unit and the dust collection unit may be connected as a unit by piping, and the unit and the intake / exhaust unit may be detachably connected by a duct hose. In this case, there is an advantage that the flow path distance for collecting dust can be suppressed. As another example, the dust collection part and the intake / exhaust part may be connected to each other by a pipe to form a unit, and the unit and the projection part may be detachably connected by a duct hose.

  Further, in the above-described embodiment, the duct 92 with the backflow prevention damper is fixed to the upper surface 80A of the cover case 80 in a sideways posture, but any of the ducts disposed in the exhaust passage of the intake / exhaust section is the upper surface of the cover case The structure which is not fixed to may be sufficient.

  Furthermore, in the above embodiment, the shot processing apparatus is the shot blasting apparatus 10, but the shot processing apparatus may be applied to, for example, a shot peening apparatus.

  In addition, the said embodiment and the above-mentioned some modification can be implemented combining suitably.

10 Shot blasting equipment (shot processing equipment)
12 Target object 14 Projection unit (projection unit)
16 Dust collection unit (dust collection unit)
18 Intake / exhaust unit (intake / exhaust section)
20 Duct hose 22 Duct hose 50 Blast head 50D Diffuser 50E Recovery hood 50F Brush 50G Projection port 80 Cover case 80A Upper surface 82 Roots blower (suction blower)
86 Exhaust passage 90 Muffler 92 Duct with backflow prevention damper (duct)
94 Outside air inlet 96 Air supply passage 100 Sound absorbing material (silencer)
102 Silencer (silencer)

Claims (9)

A projection unit for projecting a projection material from a projection port to an object to be processed;
A dust collection unit connected to the projection unit, for collecting and removing dust in the air sucked from around the projection port;
An intake / exhaust section connected to the dust collection section, for sucking air around the projection port through the dust collection section by a suction blower and discharging the air to the outside;
A cover case provided in the intake / exhaust portion, covering an outer peripheral portion of the suction blower and having an outside air introduction port for introducing outside air;
An air supply passage provided inside the cover case for supplying outside air from the outside air inlet to the suction blower;
A muffling means provided in the air supply passage for reducing the operation noise of the suction blower that extends from the inside of the cover case through the outside air inlet to the outside of the cover case;
A shot processing apparatus.   The shot processing apparatus according to claim 1, wherein a muffler is disposed in an exhaust passage of the intake / exhaust portion.   The shot processing apparatus according to claim 1, wherein the projection unit and the dust collection unit and the dust collection unit and the intake / exhaust unit are detachably connected by a duct hose.   The shot processing apparatus according to any one of claims 1 to 3, wherein a duct disposed in an exhaust passage of the intake / exhaust portion is fixed in an inclined posture on an upper surface of the cover case. In the projection unit,
A diffuser in which the projection port is formed at the tip;
Provided over the entire outer periphery of the diffuser, the base end is attached to the diffuser, the distal end is disposed with a gap between the diffuser, and between the outer peripheral surface of the diffuser A collection hood in which the space formed in the air is connected to the intake side of the dust collector;
A brush attached to the tip of the collection hood;
The shot processing apparatus of any one of Claims 1-4 by which the blast head provided with this is provided.   The shot processing apparatus according to claim 5, wherein a plurality of the blast heads are provided.   The shot processing apparatus according to claim 2, wherein the muffler is made of stainless steel.   The shot processing apparatus according to claim 3, wherein the duct hose is made of soft vinyl chloride.   The shot processing apparatus according to any one of claims 1 to 3, 7, and 8, wherein a duct disposed in an exhaust passage of the intake / exhaust section is upright.