JPH0238351B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a means for supplying abrasive shots to a centrifugal projection device by mixing the abrasive shots (hereinafter referred to as shots) into a fluid such as air and then passing the abrasive shots through a conduit. means for transporting the shot to the centrifugal projection device, separating the shot from the fluid and dust contained in the shot inside the centrifugal projection device, and feeding the separated shot to the impeller of the centrifugal projection device; The present invention relates to a centrifugal projection device equipped with a centrifugal projection device.

In a conventional centrifugal projection device, the means for supplying shots to the device is explained below.A shot storage tank is installed above the device, and the storage tank is equipped with a separator section that separates harmful dust contained in the shots from the shots. The shots, from which dust has been removed in the separator section, are supplied to the centrifugal projection device from the lower part of the storage tank via a conduit connected to the centrifugal projection device by natural fall using gravity.

Therefore, there are restrictions on the relative position between the centrifugal projection device and the shot storage tank, and depending on the relative position, it is impossible to supply shots by gravity. There were major constraints such as having to take into account the following, and a separator was also required on the outside of the centrifugal projection device.

The present invention makes it possible to separate the shot and dust inside the centrifugal projection device, and furthermore allows the shot to be mixed with a fluid such as air and then transferred to the centrifugal projection device via a conduit. By doing so, the objective is to obtain a very compact centrifugal projection device whose installation position is not restricted at all.

In addition, in the embodiment of the present invention described below, an example is shown in which the shot is suction-transported via a conduit using a suction means such as a vacuum pump.
Of course, it is also conceivable to force-feed the shot via a pipe by using a force-feeding means such as compressed air.

Hereinafter, the present invention will be explained based on drawings of embodiments.

In FIG. 1, a disk 2 is fixed to a shaft 1 that rotates clockwise when viewed from the left side, and the disk 2 has a plurality of disks (e.g. eight disks) arranged radially at equal intervals. The blade 3 is fixed.
An impeller 4 is further fixed to the shaft 1 with bolts 5, and the circumferential side and right side of the impeller 4 are surrounded by a cylindrical impeller storage case 6. The storage case 6 is fixed to the impeller case 12 and does not rotate. In addition, the circumferential side of the storage case 6 has a shot outlet 61 at a position facing the blade 3.
Equipped with.

In FIG. 2, the impeller 4 consists of a cylinder 41, four blade plates 42, and a side plate 43, and the cylinder 41 has a large number of small holes on its circumferential side. The vane plate 42 is fixed to the outside of the circumferential side of the cylinder 41 so as to be inclined forward in the direction of rotation of the impeller 4 as it goes in the shot inflow direction (leftward in the figure).
Note that the outer diameter of the impeller 4 is slightly smaller than the inner diameter of the storage case 6.

In FIG. 1, the dust transport pipe 7 is fixed to the storage case 6 together with the shot transport pipe 8 so as to face the opening of the impeller 4. The openings of the dust transport pipe 7 and the impeller 4 face each other with a slight gap so that they do not contact each other and impede the rotation of the impeller 4.

In the centrifugal projection device configured as described above, when the dust transport pipe 7 is connected to a suction blower (not shown), the dust is sucked from the shot transport pipe 8 through the small hole of the impeller 4 and the dust transport pipe 7. An air flow is generated leading to the blower. Therefore, after installing a dust collection device such as a bag filter (not shown) immediately before the upstream side of the suction blower, the shot transport pipe 8
When the shot containing dust is sucked through the opening (not shown) at the tip of the holder, the airflow containing the dust and shot passes through the shot transport pipe 8 as shown by arrow 9 and flows into the air between the impeller 4 and the storage case 6. The air flow containing the dust made of fine particles passes through the small holes of the impeller 4 and then flows into the dust transport pipe 7 as shown by the arrow 10.
The cleaning air passes through the bag filter, and only the cleaning air with dust collected in the bag filter is discharged from the suction blower.

On the other hand, shot having a large particle size cannot pass through the small hole of the impeller 4, and is transferred toward the side plate 43 by the action of the blade plate 42 due to the rotation of the impeller 4, and then the shot is transferred to the shot injection port 61 of the storage case 6. It is ejected toward the blade 3 by the action of centrifugal force applied from the blade plate 42. Further, the shot is further accelerated by the centrifugal force applied by the rotating blades 3, and then is projected at high speed toward the target object, which is the surface to be processed, as shown by the arrow 11.

Note that since the blade plate 42 of the impeller 4 is tilted forward in the direction of rotation of the impeller 4 as it goes in the inflow direction of the shot, when the impeller 4 rotates and the shot collides with the blade plate 42, the side plate 42 is attached to the shot. 4
A component force directed in the direction of 3 is generated.

At the same time, another component of force, that is, centrifugal force, is generated in the shot, but in order to reduce the possibility that the shot collides with the storage case 6 and the inner wall of the case is worn out due to the action of the centrifugal force, as shown in FIG. We propose an impeller as shown in Figure 4.

The impeller 4A in FIG. 3 is the impeller 4A in FIG.
A cylinder 44 with open ends at both ends is fixed to a portion of the circumferential side surface of the blade plate 42 that does not face the shot outlet 61 of the storage case 6. Note that the outer diameter of the cylinder 44 is slightly smaller than the inner diameter of the storage case 6.

Next, the impeller 4B shown in FIG. 4 has a shape in which the blade plates 42 of the impeller 4 shown in FIG. 2 are inclined forward in the rotational direction of the impeller 4 as they go in the circumferential direction.

In the impeller shown in FIG. 3 or 4, the shots do not scatter in the circumferential direction of the impeller, so that the inner wall of the storage case 6 suffers little wear.

Note that the number of blades of the impeller and the angle at which the blades are inclined forward in the direction of rotation of the impeller can be increased or decreased as appropriate depending on changes in the circumferential speed of the impeller, the inflow speed of the shots, etc.

Further, the small holes in the cylinder 41 may be smaller or larger than the grain size of the shot. If it is large, the shot may collide with the side wall of the small hole by increasing the circumferential speed of the cylinder 41, thereby generating centrifugal force on the shot and preventing the shot from passing through the small hole. .

Note that even if the small holes in the cylinder 41 are smaller than the grain size of the shot, there is no fear of clogging due to the action of centrifugal force.

In other words, the present invention is configured such that the shot is mixed with a fluid such as air and transferred through the shot transport pipe, and then the shot reaches a space inside the circumferential portion of the storage case and outside the circumferential portion of the impeller. At this time, the shot is given a centrifugal force by the blades of the impeller and ejects from the small shot outlet of the storage case, and then an even larger centrifugal force is applied by the impeller placed outside the storage case, causing it to burst onto the surface to be treated. It is projected vigorously towards the target. on the other hand,
The fluid containing dust, which is fine particles, passes through the small holes of the impeller to the space inside the circumference of the impeller, and then passes through the dust transport pipe to a device such as a dust collector. Therefore, of the mixed flow consisting of shots, dust particles and a fluid such as air, which are transferred through the shot transport pipe, only the shots are separated from the mixed flow in the centrifugal projection device of the present invention,
And it is projected toward the surface to be processed.

As described above, in the present invention, shots are supplied to the centrifugal projection device by the pneumatic transport method, so there is no part that uses natural fall to supply shots to the blades 3, and therefore, the centrifugal projection of the present invention The device can project shots in any direction without any restrictions on its installation position. Furthermore, since there is no need for a separate separator required in conventional centrifugal projection devices, it is very compact.

Furthermore, as an application example of the apparatus of the present invention, for example, when the space in which the surface to be treated is installed requires a vacuum of -200 mmHg, the apparatus of the present invention can:
The amount of air (air that makes up the above mixed flow) that flows out from the injection port of the storage case together with the shot is zero (the pressure of the air that makes up the above mixed flow is -200mm).
lower than Hg) or a small amount (also -200mm
Hg), it is easy to maintain the pressure on the surface to be treated at -200 mmHg.

Furthermore, as an effect of the apparatus of the present invention, for example, when the space in which the surface to be treated is installed requires a vacuum of -200 mmHg, and since the shot is suctioned and transferred by a vacuum pump, the pressure in the dust transport pipe can be reduced to -200 mmHg.
When the temperature is 400 mmHg, an air flow occurs from the space where the surface to be treated is installed through the injection port of the storage case to the dust transport pipe, but in the device of the present invention, the shot resists the above air flow. and can be ejected from the injection port.

Furthermore, as an effect of the present invention, it is preferable that the dust constituting the mixed flow flowing through the shot transport pipe is not projected toward the surface to be treated, but instead passes through the dust transport pipe as it is and is collected by the dust collection device. In the device of the present invention, dust that is easily suspended in the air because it is a fine particle and has a large surface area ratio compared to its mass does not escape from the air flow that makes up the mixed flow and is carried along with the air to the impeller. This is very convenient because it leads to the dust transport pipe through the small hole in the dust pipe.

Since the centrifugal projection apparatus of the present invention has the above-mentioned characteristics, it is most suitable as a centrifugal projection apparatus of the type that moves along the surface to be processed, like the apparatus shown in FIG.

In FIG. 5, the centrifugal projection apparatus of the present invention is installed in a bowl-shaped cabinet 103 that is open in the direction of the surface to be treated 100, and an annular ring made of a flexible material such as rubber is provided around the entire periphery of the opening edge of the cabinet 103. A seal 104 is attached so as to be in close contact with the surface to be processed 100. Further, the shot transport pipe 105 is connected to the cabinet 103 in communication with the dust transport pipe 10.
6 is communicatively connected to a suction blower 109 via a flexible hose 107 and a bag filter 108.

In the apparatus configured as described above, the shots in the cabinet 103 are transported to the shot transport pipe 105 by riding on the air flow that has flowed into the cabinet through the gap between the surface to be treated 100 and the seal 104.
Then, the centrifugal projection device 101 projects the liquid toward the surface to be processed 100 at high speed. After that, the shot repeats the above cycle of suction and projection many times.

On the other hand, harmful dust consisting of rust removed from the surface to be treated and abrasion powder of the shot mixed in the shot after projection is separated from the shot in the centrifugal projection device 101, and is then separated from the shot in the dust transport pipe 106.
The cleaning air passes through the flexible hose 107 to the baggage filter 108, and only the cleaning air after dust is removed by the baggage filter is sent to the suction blower 1.
09 and is discharged into the atmosphere.

Note that the cabinet 103 has a surface to be processed 10.
Drive wheels are mounted as a means for moving along the zero. Alternatively, the cabinet may be moved by an external force other than the drive wheels.

The above-mentioned device does not use natural fall for shot circulation, so it can treat not only walls but also floors and ceilings.Furthermore, it is extremely compact, making it highly maneuverable and suitable for use on ships, tanks, etc. This can greatly contribute to automating the cleaning work of structures with vast areas, improving efficiency, and preventing dust pollution.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of one embodiment of the present invention, FIG. 2 is a perspective view showing an embodiment of an impeller and a storage case, and FIGS. 3 and 4 are perspective views showing other embodiments of the impeller. FIG. 5 is a front view (partially longitudinal sectional view) showing an embodiment of the present invention. 102...Motor for driving centrifugal projection device, 11
0...Truck, 111...Ground surface.

Claims (1)

[Scope of Claims] 1. A shot centrifugal projection device comprising a shot supply device and an impeller disposed around the shot supply device, the shot supply device comprising an impeller and a storage case for the impeller. The impeller has a cylindrical shape with one side open, and has a large number of holes on the circumferential side, and the impeller rotates in the direction of inflow of the shot on the outside of the circumferential side. A blade plate tilted forward in the direction is fixed, and the storage case has a cylindrical shape with one side open and has a shot injection port on the circumferential side of the case at a position facing the blades of the impeller. , an open side surface of the impeller is rotatably communicated with a dust transport pipe, and a portion of the open side surface of the storage case outside the open side surface of the impeller is communicated with a shot transport pipe. Projection device. 2. The device according to claim 1, wherein a cylinder having open sides on both sides is fixed to a portion of the outer surface of the blade of the impeller that does not face the shot outlet of the storage case. 3. The device according to claim 1, wherein the blades of the impeller are inclined forward in the direction of rotation of the impeller as they go in the circumferential direction. 4. The shot projection area is surrounded by a cabinet, a shot transport pipe is connected to this cabinet, and the dust transport pipe is connected to a dust collector such as a bag filter, so that the shot can be repeatedly projected. Claim 1
The equipment described in section.