JPH074121Y2 - Blasting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a blasting device for polishing the surface of an object to be polished.

(Prior Art) Normally, a blasting device is connected to an abrasive supply means for supplying a particulate abrasive by a pressurized gas from a start end to an end of a supply pipe whose end is closed, and to the inside of the supply pipe. An injection nozzle provided at the end portion is provided, and the particulate abrasive supplied to the supply pipe is ejected toward the object to be polished through the injection nozzle to polish the surface of the object to be polished.

At this time, when the jet nozzle and the end side of the supply pipe are provided upward, the amount of the abrasive supplied to the supply pipe reaches the jet nozzle located above becomes unstable due to its own weight, so that the abrasive from the jet nozzle is unstable. It was difficult to stably eject the abrasive. Therefore, conventionally, the terminating sides of the injection nozzle and the supply pipe are provided horizontally or downward.

Further, in this type of blasting device, in order to expand the spraying area of the abrasive material by one spraying nozzle, the spraying nozzle may be swung in a predetermined range. For the same reason, the injection nozzle is swung in the range downward from the horizontal.

However, since the injection nozzle of the blasting device is provided horizontally or downwardly in this manner, the object to be polished must be arranged so as to face the injection nozzle,
For example, in the case of polishing the inner surface of a bowl-shaped object to be polished, when the abrasive is jetted to the inner surface from above with the inner surface facing upward, the abrasive accumulates in the object to be polished and Polishing may be hindered.

Further, for example, in a blasting device for polishing an object to be polished having a relatively large surface area, a plurality of injection nozzles are generally provided, and the injection material is ejected simultaneously from different injection nozzles to different parts of the object to be polished. I try to do my body in a short time.

In such a blasting apparatus having a plurality of injection nozzles, when these injection nozzles are directly arranged in the supply pipe in the longitudinal direction, the abrasive is supplied only from the starting end of the supply pipe and the supply pipe. Because the end side of is blocked,
The jetting amount of the abrasive is larger in the jet nozzle on the end side than the jet nozzle on the start side of the supply pipe. That is, in order to eject the abrasive from the injection nozzle, the abrasive supplied to the supply pipe is supplied by the pressurized gas which is pressurized sufficiently higher than the atmospheric pressure. The internal pressure of the supply pipe at is higher on the closed end side than on the start end side of the supply pipe. As a result, the amount of abrasive material ejected from the ejection nozzle at the position where the internal pressure of the supply pipe is relatively high is larger than the amount of abrasive material ejected from the ejection nozzle at the position where the internal pressure of the supply pipe is relatively low. Therefore, it is difficult to control the ejection amount of the abrasive from each ejection nozzle so that the ejection amount is the same from any ejection nozzle. Therefore, conventionally, a supply pipe is provided for each of the injection nozzles, and the supply of the abrasive to each of the supply pipes is controlled separately so that the amount of the abrasive ejected from any of the injection nozzles becomes the same. Had control.

However, when the supply pipe is provided for each ejection nozzle as described above, the larger the number of ejection nozzles, the larger the blasting device becomes, and the more expensive the blasting device is, which reduces the processing cost of the object to be polished. It was a hindrance.

(Problem to be Solved) The present invention eliminates such inconvenience, and the abrasive can be easily and stably ejected upward from the ejection nozzle, and is further supplied to one supply pipe by pressurized gas. An object of the present invention is to provide a blasting device capable of ejecting abrasives from a plurality of ejection nozzles and easily controlling the ejection amount of each of the ejection nozzles, which can be downsized.

(Means for Solving the Problems) In order to achieve such an object, the blast device of the present invention is
An abrasive supply means for supplying a particulate abrasive by a pressurized gas from the beginning to the end of a substantially horizontal supply pipe whose end is closed, and an outer peripheral surface of the supply pipe provided on the supply pipe. An enclosing part having a hollow part between and surrounding a part of the supply pipe, an injection nozzle communicating with the hollow part and provided on the upper half side of the outer peripheral surface of the enclosing part, and the enclosing part. Inside the supply pipe, an abrasive drop hole is provided in the lower part of the supply pipe so that the abrasive can fall from the supply pipe to the hollow part, and a gas for supplying a pressurized gas having a pressure lower than the internal pressure of the supply pipe to the hollow part. It is characterized in that it comprises a supply means and a partition wall provided in the hollow portion so that the pressurized gas supplied to the hollow portion flows under the abrasive drop hole toward the injection nozzle.

The supply pipe is provided with a communication hole that directs the injection nozzle in the surrounding portion to communicate the inside of the supply pipe with the hollow portion.

Further, the gas supply means selectively supplies the pressurized gas having a pressure lower than the internal pressure of the supply pipe and the pressurized gas having a pressure higher than the internal pressure of the supply pipe to the hollow portion. And

Furthermore, a plurality of the surrounding portions are provided at intervals in the longitudinal direction of the supply pipe, the injection nozzle is provided on the outer peripheral surface of each surrounding portion, and the abrasive drop hole is provided in the supply pipe in each surrounding portion. When the partition wall is provided in the hollow portion of each surrounding portion, and the gas supply means supplies a pressurized gas having a pressure lower than the internal pressure of the supply pipe to the hollow portion of each surrounding portion, each surrounding portion It is characterized in that a pressure adjusting mechanism is provided for adjusting the internal pressure of the hollow portion of each part separately.

(Operation) According to such means, the abrasive is supplied into the supply pipe together with the pressurized gas by the abrasive supply means, and then gradually deposited by its own weight in the lower part of the supply pipe over substantially the entire length. Since the internal pressure of the hollow portion in the surrounding portion is smaller than that in the supply pipe, the abrasive accumulated in the lower portion of the supply pipe falls into the hollow portion through the abrasive drop hole. At this time, the pressurized gas having a pressure lower than the internal pressure of the supply pipe supplied by the gas supply means into the hollow portion is directed toward the ejection nozzle by the partition wall through the lower side of the abrasive drop hole. The abrasive is flowing, and therefore the abrasive dropped into the hollow portion flows toward the jet nozzle and is jetted from the jet nozzle.

When the communication hole that directs the injection nozzle is provided in the supply pipe, the pressurized gas supplied together with the abrasive into the supply pipe has a higher internal pressure than the inside of the supply pipe from the communication hole in each surrounding portion. It jets toward the jet nozzle through the small hollow portion to assist the above jet of abrasive.

When the gas supply unit selectively supplies the pressurized gas having a pressure lower than the internal pressure of the supply pipe and the pressurized gas having a pressure higher than the internal pressure of the supply pipe to the hollow portion, When the gas supply means supplies a pressurized gas having a pressure higher than the internal pressure of the supply pipe to the hollow portion, the internal pressure of the hollow portion is higher than that in the supply pipe, and thus the lower portion of the supply pipe is as described above. The abrasive material deposited on the above does not drop into the hollow portion, and therefore only the pressurized gas is jetted from the jet nozzle.

Further, a plurality of the enclosing portions are provided at intervals in the longitudinal direction of the supply pipe, the ejection nozzle is provided on the outer peripheral surface of each enclosing portion, and the abrasive drop hole is formed in the supply pipe in each enclosing portion. The partition wall is provided in the hollow portion of each surrounding portion,
When the gas supply means supplies a pressurized gas having a pressure lower than the internal pressure of the supply pipe to the hollow portion of each surrounding portion, the abrasive is jetted from each jet nozzle as described above,
It is possible to control the ejection amount of the abrasive from each ejection nozzle simply by adjusting the internal pressure of the hollow portion of each surrounding portion by the pressure adjusting mechanism.

(Embodiment) The present invention will be described with reference to FIGS. 1 and 2 as an example of a blasting device. FIG. 1 is a side view of the apparatus, and FIG. 2 is a sectional view taken along line II-II of FIG.

In FIGS. 1 and 2, reference numeral 1 denotes an abrasive material supplying device connected to a starting end of a horizontal supply pipe 2 having a closed end through a piping hose 3, and 4 denotes an interval in the supply pipe 2 in the longitudinal direction thereof. 4 cylindrical enclosing portions provided in the vicinity of the enclosing portions 4, 5 are injection nozzles projecting upward on the outer peripheral surface of the upper portion of each enclosing portion 4, and 6 are piping hoses 7 on the sides of each enclosing portion 4. It is a gas supply device connected via.

The abrasive material supply device 1 supplies a pressurized gas from the starting end to the terminal end of the supply pipe 2 via a piping hose 3, and supplies the particulate abrasive a into the supply pipe 2 by the pressurized gas.

Each surrounding portion 4 is integrally fixed to the outer peripheral surface of the supply pipe 2 at a position where the axis of the surrounding portion 4 coincides with that of the supply pipe 2, and surrounds the periphery of the supply pipe 2. A hollow portion 4a is formed between the surface and the surface.

The injection nozzle 5 has an abrasive injection hole 5a passing through its center,
The abrasive injection hole 5a communicates with the hollow portion 4a of the surrounding portion 4.

Inside each surrounding portion 4, an abrasive drop hole 2a and a communication hole 2b are provided in the upper part and the lower part of the supply pipe 2 for communicating the inside of the supply pipe 2 and the hollow portion 4a, respectively, and the communication hole 2b is located above the injection nozzle 5
Is directed to the abrasive material injection hole 5a.

Piping hose 7 that connects the gas supply device 6 and each surrounding portion 4
Is a branch pipe that then branches toward each enclosure 4.
7a, the branch pipe 7a is connected to the side portion of each surrounding portion 4 as shown in the second drawing and communicates with the hollow portion 4a. And
In the hollow portion 4a of each surrounding portion 4, a partition wall 8 is provided at a position between the position communicating with the abrasive injection hole 5a of the injection nozzle 5 and the position communicating with the branch pipe 7a, as shown in the second illustration. Is provided, and the abrasive injection hole 5a and the branch pipe 7a are communicated with each other through the hollow portion 4a below the abrasive drop hole 2a.

Each of the gas supplies 6 selectively supplies a pressurized gas having a pressure lower than the internal pressure of the supply pipe 2 and a pressurized gas having a pressure higher than the internal pressure of the supply pipe 2 into the piping hose 7 through the valve 9. However, these pressurized gases are selectively branched to the branch pipe 7a.
And is supplied to the hollow portion 4a of each surrounding portion 4. here,
A pressure adjusting mechanism 10 is provided for each surrounding portion 4 in the middle of the branch pipe 7a, and the internal pressure of the hollow portion 4a is appropriately adjusted for each surrounding portion 4.

Next, the operation of polishing an object to be polished (not shown) by the blasting device will be described.

In this blasting apparatus, first, the abrasive material a is supplied together with the pressurized gas from the starting end to the terminal end of the supply pipe 2 by the abrasive material supplying device 1, and the abrasive material a is fed by its own weight as shown in FIGS. 1 and 2. It is gradually deposited on the lower part of the supply pipe 2 over almost the entire length.

On the other hand, the hollow portion 4a of each surrounding portion 4 is supplied with pressurized gas having a pressure lower than the internal pressure of the supply pipe 2 by the gas supply device 6, and at this time, the pressurized gas that has flowed into the hollow portion 4a. Is
As shown in FIG. 2, the partition wall 8 allows the abrasive material drop hole to be formed.
The hollow portion 4a flows through the lower side of 2a toward the abrasive injection hole 5a of the injection nozzle 5. Then, the internal pressure of each hollow portion 4a is appropriately adjusted by the pressure adjusting mechanism 10 and is kept smaller than the internal pressure of the supply pipe 2. More specifically, each enclosure 4
Pa ₁ the internal pressure of the supply pipe 2 in the order from the terminal side at the position of, P
Assuming that the internal pressures of a ₂ , Pa ₃ , Pa ₄ and each hollow portion 4a are P ₁ , P ₂ , P ₃ , P _{4 in} order from the end side of the supply pipe 2, Pa _i > P _i (i = 1 to 1)
4), and the internal pressure P ₁ , P ₂ , P ₃ , P _{4 of} each hollow portion 4a
Between the internal pressure of the supply pipe 2 and Pa ₁ , Pa ₂ , Pa ₃ , Pa ₄ Pa _i −P
_i (i = 1 to 4) is almost the same. At this time, the pressurized gas supplied to the supply pipe 2 goes from the start end to the end, so that the internal pressures Pa ₁ , Pa ₂ , Pa ₃ , Pa ₄ of the supply pipe 2 are larger toward the end side Pa ₁ > Pa ₂ > Pa. ₃ > Pa ₄ , and therefore the internal pressures Pa ₁ , Pa ₂ , Pa ₃ , Pa ₄ of each hollow portion 4a are P ₁ > P ₂ > P ₃ > P ₄ .

As described above, the abrasive material a deposited on the lower portion of the supply pipe is filled with P ₁ , P ₂ , P ₂ of the hollow portion 4a in each surrounding portion 4 as described above.
Since P ₃ and P ₄ are smaller than that of the supply pipe 2, they fall into the hollow portion 4a through the abrasive drop hole 2a as shown in the second illustration, and then the pressurized gas supplied to the hollow portion 4a Since it flows through the hollow portion 4a as described above, it flows through the hollow portion 4a toward the abrasive material injection hole 5a of the injection nozzle 5 and is ejected upward from the injection nozzle 5. At this time, the internal pressures P ₁ , P ₂ ,
Since the difference between P ₃ , P ₄ and the internal pressures Pa ₁ , Pa ₂ , Pa ₃ , Pa ₄ of the supply pipe 2 is almost the same as described above, any of the injection nozzles 5
From this, substantially the same amount of abrasive material a is ejected.

Further, since the internal pressures P ₁ , P ₂ , P ₃ , P _{4 of} the hollow portion 4a are smaller than that of the supply pipe 2, the pressurized gas supplied into the supply pipe 2 is directed to the abrasive injection hole 5a. From the communicating hole 2b that is being sprayed upward toward the abrasive material injection hole 5a, which assists the above-described ejection of the abrasive material a from the injection nozzle 5.

As described above, in this blasting device, the abrasive material a deposited in the supply pipe 2 and dropped from the supply pipe 2 into the hollow portion 4a is ejected from the ejection nozzle 5, so that the ejection nozzle 5 is enclosed in the surrounding portion 4. The abrasive a can be ejected upward and stably ejected upward. Then, by appropriately adjusting the internal pressures P ₁ , P ₂ , P ₃ , P ₄ of the hollow portion 4a by the pressure adjusting mechanism 10 for each surrounding portion 4, the ejection amount of the abrasive a from each ejection nozzle 5 can be easily performed. It is possible not only to make the ejection amount substantially the same from any of the ejection nozzles 5 as described above, but also to make the ejection nozzles 5 different from each other. Furthermore, it is needless to say that the supply pipe 2 can be provided with an arbitrary number of injection nozzles 5.

Further, when the gas supply means 6 supplies the pressurized gas having a pressure higher than the internal pressure of the supply pipe 2 to the hollow portions 4a of the respective surrounding portions 4, the internal pressure of the hollow portions 4a is the same as that of the supply pipe 2. The abrasive material a is kept larger than the above, and the abrasive a accumulated in the supply pipe 2 does not drop into the hollow portion 4a, and only the pressurized gas is ejected from the ejection nozzle 5. Therefore, for example, after the pressurized gas having a pressure lower than the internal pressure of the supply pipe 2 is supplied to the hollow portion 4a by the gas supply means 6 and the object to be polished is polished by this blasting device, it is higher than the internal pressure of the supply pipe 2. By supplying a pressurized gas having a pressure to the hollow portion 4a, the object to be polished can be blown with air to remove the abrasive material a and the like attached thereto.

In the present embodiment, when the supply pipe 2 is rotated around its axis to oscillate each injection nozzle 5 and expand the injection area of the abrasive a, the inside of each surrounding portion 4 is described above. By providing a plurality of abrasive drop holes 2a in the lower portion of the supply pipe 2 or by forming the elongated holes extending in the circumferential direction of the supply pipe 2, the jet nozzles 5 can be swung up and raised upward without trouble as described above. Needless to say, the abrasive material a can be jetted out.

(Effect) As is apparent from the above description, according to the blasting device of the present invention, the abrasive supplied to the supply pipe by the abrasive supply means and dropped from the abrasive drop hole to the hollow portion in the surrounding portion is By ejecting from the jet nozzle with a pressurized gas having a pressure lower than the internal pressure of the supply pipe supplied to the hollow portion, the abrasive can be easily and stably jetted upward even if the jet nozzle is provided upward. You can

When a communication hole that directs the injection nozzle is provided in the supply pipe, the pressurized gas supplied into the supply pipe is ejected toward the injection nozzle through the communication hole, and The ejection of the abrasive is assisted, and the abrasive can be efficiently ejected from the ejection nozzle.

When the gas supply means selectively supplies the pressurized gas having a pressure lower than the internal pressure of the supply pipe and the pressurized gas having a pressure higher than the internal pressure of the supply pipe to the hollow portion, the surrounding portion By supplying a pressurized gas having a pressure higher than the internal pressure of the supply pipe to the hollow part of the nozzle, only the pressurized gas is ejected from the injection nozzle, and not only polishing of the object to be polished but also air blowing can be performed. A device can be provided.

Further, a plurality of the surrounding portions are provided at intervals in the longitudinal direction of the supply pipe, the jet nozzle is provided on the outer peripheral surface of each surrounding portion, and the abrasive drop hole is provided in the supply pipe in each surrounding portion. When the partition wall is provided in the hollow portion of each surrounding portion, the ejection amount of the abrasive can be easily controlled for each ejection nozzle by adjusting the internal pressure of the hollow portion for each surrounding portion. By providing a plurality of injection nozzles in the surrounding portion provided in one supply pipe, it is possible to provide a small blasting device.

[Brief description of drawings]

FIG. 1 is an explanatory side view of an example of the blasting device of the present invention,
FIG. 2 is a sectional view taken along the line II-II in FIG. 1 ... Abrasive material supply device, 2 ... Supply pipe 2a ... Abrasive material drop hole, 2b ... Communication hole 4 ... Enclosing part, 4a ... Hollow part 5 ... Injection nozzle, 6 ... Gas supply device 8 ...... Partition, a …… Abrasive material 10 …… Pressure adjusting mechanism

Claims (4)

[Scope of utility model registration request] 1. An abrasive supply means for supplying a particulate abrasive by a pressurized gas from a starting end to an end of a substantially horizontal supply pipe having a closed end, and the supply pipe provided in the supply pipe. An enclosing portion having a hollow portion between the outer peripheral surface of the enclosing portion and the outer peripheral surface and enclosing a part of the supply pipe, and an injection provided on the upper half portion side of the outer peripheral surface of the enclosing portion in communication with the hollow portion. A nozzle, an abrasive drop hole provided in the lower part of the supply pipe so that the abrasive can fall from the inside of the supply pipe to the hollow part in the surrounding part, and a pressurization having a pressure smaller than the internal pressure of the supply pipe in the hollow part. And a partition wall provided in the hollow portion so that the pressurized gas supplied to the hollow portion flows toward the injection nozzle through the lower side of the abrasive drop hole. Blasting device characterized by. 2. The blasting device according to claim 1, wherein the supply pipe is provided with a communication hole that directs the injection nozzle in the surrounding portion to communicate the inside of the supply pipe with the hollow portion. . 3. The gas supply means selectively supplies a pressurized gas having a pressure lower than the internal pressure of the supply pipe and a pressurized gas having a pressure higher than the internal pressure of the supply pipe to the hollow portion. The blasting device according to claim 1, wherein the blasting device is a blasting device. 4. A plurality of the surrounding portions are provided at intervals in the longitudinal direction of the supply pipe, the injection nozzle is provided on an outer peripheral surface of each surrounding portion, and the abrasive is attached to the supply pipe in each surrounding portion. When a drop hole is provided, the partition is provided in the hollow part of each surrounding part, and the gas supply means supplies a pressurized gas having a pressure smaller than the internal pressure of the supply pipe to the hollow part of each surrounding part. 2. A pressure adjusting mechanism for adjusting the internal pressure of the hollow portion of each surrounding portion separately is provided.
Blasting device as described.