JP3471273B2 - Grinding powder recovery equipment for dry grinding machines - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding powder recovery device for a dry grinding machine.

[0002]

2. Description of the Related Art Generally, a dry grinder is often used for processing parts requiring dimensional accuracy. In the case of a dry grinding machine, when the grinding powder generated from grinding from the work to be ground is not well accumulated inside the machine, or when the grinding material is expensive and the request for recovery is large, it is usually treated as a grinding target. A grinding powder recovery reservoir is disposed below the work to be used, and the powder in the grinding powder recovery reservoir is sucked and recovered by a powder recovery device such as a cyclone or a bag filter.

For example, in the case of a cylindrical fuel pellet used for nuclear power generation, a dry grinder is used when finishing a cylindrical raw material to a predetermined size, and the grinding powder of the pellet has a radioactive property. , Collected and treated to prevent pollution.

FIG. 5 shows a schematic structure of a conventional grinding powder collecting apparatus for a dry grinding machine applied to the above fuel pellets. The apparatus shown in FIG. 5 includes a work (pellet) 1, a work rest 2 that supports the work, a grinding wheel 3, and an adjusting wheel 4.
And a grinding powder recovery reservoir 5 and a grinding powder recovery pipe 6 provided below the grinding powder recovery reservoir 5 for introduction into a powder recovery device such as a cyclone or a bag filter (not shown).
And a casing 7 for grinding.

The above grinder is a dry grinder of a type called a centerless glider, and instead of supporting a cylindrical work 1 at the center, the outer surface of the work is supported by an adjusting wheel 4 and a work rest 2, and the adjusting wheel is adjusted. By tilting 4 in a horizontal direction and a vertical direction by a predetermined angle, the work 1 is rotated, and at the same time, the work 1 is ground while flowing forward. The rotation of the adjusting wheel 4 slightly tilted with respect to the grinding wheel axis. This is a type in which a feed operation is applied to the work 1 by utilizing a component force and following a dimensional change due to grinding.

[0006]

The conventional grinding powder collecting apparatus for the dry grinding machine described above has the following problems.

Although the grinding powder is always sucked and collected by the powder collecting device, the grinding powder mainly adhered to the inner surface of the casing for the grinding wheel or a part of the grinding powder in the grinding powder collecting reservoir is used. Was not collected and remained in the machine, and there was a problem that suction was impossible or grinding work became impossible.

Further, in the case of the above fuel pellets, the work of artificially brushing off the residual grinding powder with a brush is carried out, and maintenance is carried out to recover at a timely interval, but the amount of residual powder is large. There is a problem that not only the work is difficult but also the exposure dose from the grinding powder increases via the work glove box.

The present invention has been made in view of the above points, and an object of the present invention is to reduce the residual grinding powder in the grinding machine, shorten the maintenance time, and apply it to radioactive pellets. Another object of the present invention is to provide a grinding powder recovery device for a dry grinding machine, which reduces the exposure dose during maintenance work.

[0010]

In order to solve the above-mentioned problems, the present invention provides a grinding wheel, a casing for grinding, and
An adjusting wheel having a function of rotating and feeding a work to be ground, a casing for the adjusting car, a work rest attached to the casing for the adjusting car to support the work from below, and with the grinding from the work. In order to collect the generated grinding powder, a grinding powder recovery reservoir arranged below the work, and the grinding powder for introducing the powder in the grinding powder recovery reservoir into a powder recovery device having a cyclone or a bag filter. In a grinding powder collecting device for a dry grinding machine, which is provided with a grinding powder collecting pipe provided below a collecting pool, the grinding powder collecting pool guides the grinding powder of the workpiece to an inlet of the grinding powder collecting pipe. The grinding powder guiding means is provided, and a part of the grinding powder guiding means is inserted into the hollow portion provided in the central portion of the workrest and arranged. Is, the grinding powder adhered to the grinding wheel and the regulating wheel with a grinding powder of the workpiece be collected shall be configured so as to guide the entrance of the grinding powder recovery line (claim 1).

With the above structure, the amount of the grinding powder that is drawn into and adheres to and remains on the inner surface of the casing for the grinding wheel is significantly reduced.

Further, since the grinding powder adhering to the adjusting wheel is also collected and discharged toward the powder collecting device, the residual grinding powder amount is further reduced.

Further, in the grinding powder collecting apparatus according to claim 1, the grinding powder adhering to the grinding wheel and the casing for grinding is collected, and the powder is collected by a powder collecting path of a system different from the grinding powder collecting pipe. An auxiliary powder recovery means connected to the recovery device is provided (Claim 2). With this configuration, the grinding powder drawn into the inner surface of the casing for the grinding wheel is constantly discharged toward the powder recovery device, so that the residual grinding powder amount is further reduced.

Further, in the grinding powder collecting apparatus according to claim 2, the auxiliary powder collecting means is a powder floating means for floating the grinding powder adhered to the grinding wheel and the casing for grinding by flowing air, and It comprises a powder air conveying means for conveying the floating powder by air and a powder air discharging means for introducing the floating powder into the powder collecting apparatus (claim 3). According to this configuration, since all grinding powder is treated with the fluidized air,
Facility configuration and maintenance can be simplified.

As an embodiment of the third aspect, for example, it is preferable that the configuration of the invention of the fourth aspect is adopted. That is, in the grinding powder recovery device according to claim 3, the powder floating means comprises a perforated plate and a powder floating air inlet provided below the grinding wheel, and is ground by the air ejected from the holes. Doing so as to float the powder, the powder air conveying means is provided adjacent to the powder floating means, to drop the grinding powder clinging to or attached to the lower work side of the grinding wheel to the grinding powder recovery reservoir, And a baffle plate provided to prevent the floating powder on the lower non-work side of the grinding wheel from flowing to the grinding powder collecting reservoir side, a plurality of air blowing nozzles, and a carrier air introduction port, a nozzle The air blown from the air conveys the floating powder, and the powder air discharge means includes a conveying air flow passage provided between the grinding wheel and the casing for grinding and a case for the wheel. It shall consist of the exhaust pipe that attached to sequencing.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS.

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention. In FIG. 1, the same parts as those in FIG. The difference between the embodiment of FIG. 1 and FIG. 5 is that, in the case of the embodiment of FIG. 1, an auxiliary consisting of grinding powder guide means 8 and powder floating means 10, powder air conveying means 11, and powder air discharging means 12 The point is that the powder collecting means 9 is provided. FIG. 2 is an enlarged view of a portion P related to the powder floating means 10 and the powder air conveying means 11 in FIG. 1, and details of the configuration are shown in FIGS. 3 and 4, respectively.

In FIG. 1, the grinding powder guide means 8 is
For example, as shown in the figure, it is composed of a funnel-shaped tray provided under the grindstone near the work and an induction pipe, and the grinding powder near the work is locally collected and guided to the inlet of the grinding powder recovery pipe 6. To configure. It is desirable that the grinding powder guide means 8 has an opening area as small as possible so that a recovery flow velocity of 10 m / s or more can be obtained.

By providing the grinding powder guide means 8, the powder generated in the vicinity of the work is intensively sucked and collected by the powder collecting device to prevent the powder from scattering to the outside, and the grinding powder is stored in the grinding casing 7. It is possible to prevent the particles from being attracted to and adhered to and remaining on the inner surface side, and the amount of residual grinding powder is significantly reduced.

Further, as shown in FIG. 1, the grinding powder guide means 8 is partially inserted into the hollow portion of the center of the work rest 2, and the work rest 2 is attached to the adjusting vehicle casing 40 so as to be in the vicinity of the work 1. The grinding powder adhered to the adjusting wheel 2 is also collected together with the grinding powder.

Next, an embodiment of the powder floating means 10 will be described with reference to FIG. FIG. 3A shows a powder floating means 1.
0 is a side sectional view, and FIG. 3 (b) is a front view. In FIG. 2, the powder floating means 10 shows the outline of a side sectional view. The powder floating means 10 includes a perforated plate 13 and a mounting plate 31.
And an air inlet 14 for powder suspension, and the porous plate 13 is
A large number (several hundreds) of holes 30 are formed on the surface, and air is blown out from the holes to float the grinding powder drawn into the inner surface of the grinding casing 7. By suspending the grinding powder by the powder floating means 10 and introducing it into the powder recovery device by the powder air conveying means 11 and the powder air discharging means 12, which will be described next, it is possible to prevent the grinding powder from being accumulated inside the machine.

Next, referring to FIG. 4, powder air conveying means 11
An example will be described. 4A shows a front view of the powder air conveying means 11, and FIG. 4B shows a side view thereof. In FIG. 2, the powder air conveying means 11 is shown schematically in a side sectional view. The powder air conveying means 11 includes a body 15, a carrier air introducing port 16 provided in the body, a plurality of air blowing nozzles 17 provided in the body and communicating with the carrier air introducing port, a baffle plate 18, and a jam. Plate holding plate 19
And an air volume adjusting plate 20 whose mounting position can be adjusted by a long hole provided near the bolt, and a mounting foot 21 of the main body.

As shown in FIG. 2, the powder air conveying means 11 is mounted adjacent to the powder floating means 10, and is mounted so that the baffle plate 18 blocks air from the grinding powder collecting reservoir 5 side of the main body 15. To be Then, the air introduced from the carrier air introduction port 16 is blown into the air blowing nozzle 17
It is configured to be ejected from and to convey the powder floating air.

The air for the powder floating means 10 and the air for the powder air conveying means 11 can be supplied from the same air source (not shown). In this case, the respective supply flow rates are the flow rate adjusting valve and the one in FIG. The air volume adjusting plate 20 is used to adjust to an optimum value.

As shown in FIG. 1, the powder air discharge means 12 comprises a carrier air flow passage 70 and an exhaust pipe 71, and collects the air containing the powder carried by the powder air carrier means 11 into a powder not shown. Lead to the device.

With respect to the apparatus of the present invention and the conventional apparatus according to the above-described embodiment, the recovery rate of grinding powder (ratio between the amount of powder recovered by the powder recovery apparatus and the amount of powder generated by grinding) during a predetermined maintenance period, and the casing. According to the result of comparative measurement of the amount of residual powder in the powder, the recovery rate was improved from about 50% in the conventional example to about 92% in the example of the present invention. In addition, the amount of residual powder in the casing is approximately 37% of the conventional level.
Was reduced to about 7% in the example of the present invention. As a result, the amount of powder remaining in the grinder was reduced, and the exposure dose during maintenance work could be reduced.

[0027]

As described above, according to the present invention, the grinding wheel, the grinding casing, the adjusting wheel having the function of rotating and feeding the workpiece to be ground, the adjusting vehicle casing, and the workpiece from below. A work rest attached to the casing for the adjusting vehicle for supporting, a grinding powder collecting reservoir arranged below the work for collecting grinding powder generated from the work during grinding, and the grinding powder collecting reservoir. In a grinding powder recovery device for a dry grinding machine, which comprises a grinding powder recovery pipe provided below the grinding powder recovery reservoir for introducing the powder in the powder recovery reservoir into a powder recovery device having a cyclone or a bag filter, The grinding powder recovery reservoir includes grinding powder guide means for guiding the grinding powder of the workpiece to the inlet of the grinding powder recovery pipe, and The guide means is arranged such that a part of the guide means is inserted into a hollow portion provided in the central portion of the work rest, and the grinding powder of the work is collected together with the grinding powder adhering to the grinding wheel and the adjusting wheel. Since it is configured to be guided to the inlet of the grinding powder recovery pipe, it is possible to reduce the amount of residual grinding powder in the grinding machine and the maintenance time.In addition, when applied to radioactive pellets, etc. It is possible to reduce the exposure dose.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention.

FIG. 2 is an enlarged view of part P in FIG.

FIG. 3 is a configuration diagram of an embodiment of a powder floating means according to the present invention.

FIG. 4 is a configuration diagram of an embodiment of a powder air conveying means according to the present invention.

FIG. 5 is a schematic configuration diagram showing an example of a conventional grinding powder collecting device for a dry grinding machine.

[Explanation of symbols]

1: Work (pellet), 2: Work rest, 3: Grinding grindstone, 4: Adjusting wheel, 5: Grinding powder collecting reservoir, 6: Grinding powder collecting pipe, 7: Grinding casing, 8: Grinding powder guide means, 9 : Auxiliary powder collecting means, 10: powder floating means, 1
1: powder air conveying means, 12: powder air discharging means, 1
3: Perforated plate, 14: Powder floating air inlet, 15: Main body, 16: Conveying air inlet, 17: Air blowing nozzle, 18: Baffle plate, 20: Air volume adjusting plate, 21: Mounting foot, 30: Hole , 31: mounting plate, 40: casing for regulating vehicle, 70: carrier air flow passage, 71: exhaust pipe.

Front page continuation (72) Inventor Yoshihiro Suzuki, 1-1 Tanabe Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Fuji Electric Co., Ltd. (56) Reference JP-A-56-89477 (JP, A) JP-A-1- 256660 (JP, A) Actual Kaihei 7-27752 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B23Q 11/00 B24B 5/18 B24B 55/06

Claims (4)

(57) [Claims] 1. A grinding wheel, a casing for grinding, an adjusting wheel having a function of rotating and feeding a workpiece to be ground,
A casing for the adjusting vehicle, a work rest mounted on the casing for the adjusting vehicle to support the work from below, and a work rest below the work in order to collect grinding powder generated from grinding from the work. And a grinding powder recovery pipe provided below the grinding powder recovery reservoir for introducing the powder in the grinding powder recovery reservoir into a powder recovery device having a cyclone or a bag filter. In the grinding powder collecting device for a dry grinding machine, the grinding powder collecting reservoir comprises grinding powder guiding means for guiding the grinding powder of the workpiece to an inlet of the grinding powder collecting pipe, and the grinding powder guiding means. Is disposed by inserting a part thereof into a hollow portion provided in the central portion of the work rest, and together with the grinding powder of the work, the grinding stone and the grinding wheel. A grinding powder collecting apparatus for a dry grinding machine, characterized in that it also collects grinding powder adhering to a train and guides it to the inlet of the grinding powder collecting pipe. 2. The grinding powder collecting apparatus according to claim 1, wherein the grinding powder adhering to the grinding wheel and the casing for grinding is collected, and the powder is collected by a powder collecting path of a system different from the grinding powder collecting pipe. A grinding powder collecting device for a dry grinding machine, comprising an auxiliary powder collecting means connected to the device. 3. The grinding powder collecting device according to claim 2, wherein the auxiliary powder collecting means is a powder floating means for floating the grinding powder adhered to the grinding wheel and the casing for grinding by flowing air, and the floating means. A grinding powder collecting device for a dry grinding machine, comprising: a powder air carrying means for carrying the powder by air; and a powder air discharging means for introducing the floating powder into the powder collecting device. 4. The grinding powder collecting apparatus according to claim 3, wherein the powder floating means comprises a perforated plate provided below the grinding wheel and a powder floating air introduction port, and is jetted from the hole. Make the grinding powder float by air,
The powder air conveying means is provided adjacent to the powder floating means, drops the grinding powder that adheres or floats on the lower work side of the grinding wheel to the grinding powder recovery reservoir, and lowers the non-work side of the grinding wheel. The baffle plate provided to prevent the floating powder from flowing to the grinding powder collecting reservoir side, a plurality of air blowing nozzles, and a carrier air introducing port, and the floating powder by the air blown from the nozzle. And the powder air discharge means comprises a carrier air flow passage provided between the grinding wheel and the casing for grinding and an exhaust pipe attached to the casing for the wheel. A characteristic grinding powder recovery device for dry grinding machines.