JPH0146269B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a centrifugal projection device equipped with an impeller having a function of separating the dust contained in the abrasive shot from the shot.

In a conventional centrifugal projection device, a separator is installed above the device to separate the shots from harmful dust contained in the shot, and the shot from which dust is removed in the separator is supplied to the centrifugal projection device by gravity. It was something that would be done.
Therefore, depending on the installation position of the centrifugal projection device, it is impossible to supply shots by natural fall, and therefore there are significant restrictions on the installation position of the centrifugal projection device, and furthermore, a separator is required outside the device.

The present invention provides a very compact centrifugal projection device in which the installation position is not restricted at all by separating the shot and dust inside the centrifugal projection device, and in addition, by pneumatically transporting the shot to the centrifugal projection device. It is an object.

To explain based on the drawings of the embodiment of the present invention, in FIG. 1, a disk 2 is attached to a shaft 1 that rotates clockwise when viewed from above, and furthermore, on the disk 2, there are arranged radially and equidistantly spaced disks. Multiple sheets (e.g. 8
) blades 3 are fixed. An impeller 4 is further fixed to the shaft 1 with bolts 5, and the circumferential side and bottom surface of the impeller 4 are surrounded by a cylindrical impeller storage case 6. Storage case 6
is fixed to the impeller case 12 and does not rotate. Further, the storage case 6 is provided with a shot injection port 61 at a position facing the blade 3 on the circumferential side surface. In FIG. 2, the impeller 4 consists of a cylinder 41 and a side plate 42, and the cylinder 41 has a large number of small holes on its circumferential side. In FIG. 1, the dust transport pipe 7 and the shot transport pipe 8 are fixed to the impeller case 12 so as to face the opening of the impeller 4. The dust transport pipe 7 and the openings of the impeller 4 face each other with a slight gap so that the rotation of the impeller 4 is not hindered.

When the dust transport pipe 7 is connected to the suction blower in the centrifugal projection device configured as described above, the air flow from the shot transport pipe 8 passes through the small hole of the impeller 4 and the dust transport pipe 7 to the suction blower. Occur. Therefore, when a back filter is installed in front of the suction blower and the shot containing dust is sucked through the opening at the end of the shot transport pipe 8, the dust and shots pass through the shot transport pipe 8 as shown by arrow 9 to the impeller 4 and the storage case 6. The dust consisting of fine particles passes through the small holes of the impeller 4, passes through the dust transport pipe 7 as shown by the arrow 10, and is collected in the back filter, and only clean air is discharged from the suction blower. . On the other hand, the large and heavy shot particles cannot pass through the small holes of the impeller 4, and are instead repelled by the impeller 4 and are ejected from the shot outlet 61 of the storage case 6 toward the blades 3, which further rotate the blades. It is accelerated by the centrifugal force of 3 and is projected toward the target at high speed as shown by arrow 11. Even if the small hole in the cylinder 41 of the impeller 4 is smaller or larger than the grain size of the shots, by increasing the circumferential speed of the cylinder 41, the shot collides with the side wall of the small hole, and a centrifugal force is applied to the shot, so that the shot is Various shapes can be considered as long as they can prevent passage through the small holes. 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. Furthermore, as shown in FIG. 3, if the vane plate 43 is fixed to the outside of the cylinder 41, the shot can be smoothly ejected from the shot outlet 61.

As mentioned above, if shots are supplied to the centrifugal projection device of the present invention by the pneumatic transport method, there is no part that uses natural fall to supply shots to the blades 3, and therefore the device of the present invention can be installed at its installation position. Shots can be projected in any direction without any restrictions. Furthermore, since a separate separator is not required, it is very compact.

Since the centrifugal projection device of the present invention has the above characteristics, it is most suitable as a centrifugal projection device of the type that moves along the processing surface like the device shown in FIG.

In FIG. 4, a centrifugal projection device 101 of the present invention is shown.
is attached to a bowl-shaped cabinet 103 that is open in the direction of the processing surface 100, and an annular seal 104 made of a flexible material such as rubber is attached to the entire circumference of the opening edge of the cabinet 103 so as to be in close contact with the processing surface 100. There is. Further, the shot transport pipe 105 is connected to the cabinet 103, and the dust transport pipe 106 is 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 sucked into the shot transport pipe 105 by the airflow that flows into the cabinet through the gap between the processing surface 100 and the seal 104, and then the shots are sent through the centrifugal tube 105. The projection device 101 projects the light toward the processing surface 100 at high speed. After that, the shot repeats the above cycle of suction and projection many times. On the other hand, harmful dust such as rust removed from the treated surface and abrasion powder of the shot mixed in the shot after the projection is separated from the shot in the centrifugal projection device 101 and then transferred to the dust transport pipe 10.
6. The clean air passes through the flexible hose 107 to the bag filter 108, and only the clean air after removing dust from the bag filter is discharged into the atmosphere from the suction blower 109. Note that drive wheels are mounted on the cabinet 103 as means for moving it along the processing surface 100. Alternatively, it may be moved by an external force.

In the above-described embodiments of the present invention, an example is shown in which the shot is transported by suction, but it is naturally possible to transport the shot under pressure with compressed air.

The device of the present invention does not use natural fall for the circulation of shot, so it can treat not only walls but also floors and ceilings.Furthermore, it is very compact as it does not require a separator to separate dust and shot. Automation and efficiency improvement of cleaning work for structures with high mobility and large areas such as ships and tanks,
This can greatly contribute to the prevention of 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 the impeller and storage case, Fig. 3 is a perspective view showing another embodiment of the impeller, and Fig. 4 is a perspective view showing an embodiment of the impeller. FIG. 1 is a front view (partially longitudinal sectional view) showing an embodiment of the present invention. 102... Centrifugal projection device drive motor, 110
...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 plurality of holes on its circumferential side, and the storage case has a cylindrical shape with one side open and has a plurality of holes on its circumferential side. A shot outlet is provided at a position facing the blades of the impeller, an open side surface of the impeller is communicated with a dust transport pipe so that the impeller can rotate freely, and an open side surface of the storage case is communicated with a shot transport pipe. A centrifugal projection device featuring: 2. The device according to claim 1, characterized in that a vane plate is fixed to the outside of the circumferential side of the impeller. 3. 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 collection device such as a bag filter, so that the shot can be projected repeatedly. An apparatus according to claims 1 and 2.