JP3011663B2 - Pneumatic shot blasting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pneumatic shot blast apparatus.

[0002]

2. Description of the Related Art Conventionally, as a pneumatic shot blasting apparatus, a storage tank for storing an abrasive material to be discharged is provided, and a tip of a pipe for sending compressed air into an abrasive material storage space of the tank is provided. The pipe is further branched outside the tank, the branch pipe is extended through the inside of the tank such that the tip faces the outside of the tank, and the branch pipe is provided with a polishing material introduction hole in the tank. It is known that a pressure adjusting means for flowing compressed air is provided at an appropriate position on the side opposite to the tank from the branch portion, and a flow path opening / closing means is provided, and a flow adjusting means for flowing compressed air is provided on the branch pipe. I have.

In the above shot blasting apparatus, a compressed air discharge port of a compressor is connected to a tip of the pipe on the side opposite to the tank, and a polishing material discharge nozzle is connected to a tip of the branch pipe. After the material is stored and the tank is made substantially closed, the compressed air flow path opening / closing means, specifically, the opening / closing valve is opened, and compressed air from the compressor is introduced into the tank through the pipe and the tank is opened. The internal pressure is increased to pump the abrasive material together with the air into the abrasive material introduction hole of the branch pipe, and the abrasive material that has been sent to the abrasive material introduction hole together with the air through the compressed air also to the branch pipe. And the air are pressure-fed together to the abrasive discharge nozzle side, whereby the abrasive is ejected from the abrasive discharge nozzle together with air.

[0004]

However, in the shot blasting apparatus having the above-mentioned conventional structure, when the flow opening / closing valve for the compressed air is closed and then the flow opening / closing valve is opened again to eject the abrasive material. However, since the amount of the cleaning material ejected in the early stage is large and the momentum of the compressed air is not high, the momentum of the abrasive is spontaneously weakened. There was a difference between the amount of material ejected per unit time and the ejection pressure, and a stable ejection state could not be obtained.

To explain this more specifically, even if the flow path opening / closing valve is closed, since the pressure in the tank is high, the abrasive material is continuously pumped to the abrasive material introduction port to some extent, whereby the abrasive material is contained in the branch pipe. A cleaning material is introduced. However, since the flow path on-off valve is closed and no new compressed air is sent into the tank, it is introduced into the branch pipe from the polishing material introduction port according to the weight of the cleaning material and the tank internal pressure. The cleaned material does not reach the point where it is pushed out of the nozzle and stays between the nozzle tip and the vicinity of the cleaned material introduction port. On the other hand, compressed air is not sent to the branch pipe because the flow path on-off valve is closed. Therefore, the abrasive material that has stayed between the tip of the nozzle and the vicinity of the abrasive material introduction port stays there.

[0006] Then, when the compressed air is sent by opening the flow passage opening / closing valve again, as described above, in the initial stage, first, the abrasive material retained between the tip of the nozzle and the vicinity of the abrasive material introduction port is provided. Is ejected from the nozzle tip, which is different from a steady state (a state in which the abrasive is continuously ejected). That is, since the amount of the abrasive to be ejected is large and the momentum of the compressed air is not high in exchange for that, the momentum to eject the abrasive is naturally weakened.

[0007] In a steady state, the abrasive material pumped by air at a certain pressure is introduced into the branch pipe from the abrasive material introduction port, and the compressed air passing through the branch pipe at the moment of being introduced into the branch pipe. Therefore, it is considered that the abrasive material and the compressed air are mixed at a relatively uniform density at a certain ratio from the nozzle tip to the abrasive material introduction port. Moreover, it is considered that these mixtures have a certain moving speed. However, in the above-mentioned initial state, since the abrasive material accumulated in a certain amount is pushed out from behind by compressed air, the abrasive material and the compressed air are more evenly mixed than in the steady state. Since the accumulated abrasive is pushed out from the rear, the compressed air at the same pressure as in the steady state is used, the momentum is reduced by the weight of the abrasive, and the moving speed is lower than in the steady state. Is considered to decrease.

Further, as a result of the above, pulsation may occur in the state where the abrasive is ejected for a certain period of time from the initial stage of ejection of the abrasive to the steady state.

As described above, in the conventional shot blasting apparatus, the abrasive material cannot be stably discharged between the start of use and the time of stable use.

The present invention has been made in view of the above points, and solves the above-mentioned disadvantages of the prior art. Even in the initial stage of the discharge of the abrasive material, the amount of the abrasive material, the discharge pressure, and the like are stable near a steady discharge state. It is an object of the present invention to provide an air-type shot blasting apparatus that can create a stable discharge state and can perform stable shot blasting from the initial discharge to the steady discharge state.

[0011]

According to the present invention, there is provided (1) a polishing material storage tank and a first tank having a discharge port facing the storage tank.
Air supply pipe, and the first air supply pipe has an abrasive material introduction hole connected to the first air supply pipe so that air can flow therethrough and passing through the storage tank and communicating with the lumen of the pipe in the storage tank. And a second air pipe through which the abrasive is discharged together with air from a discharge port facing the outside of the storage tank, and the second air pipe has an air port in the storage tank. The exhaust means is provided so that air can flow through the second air pipe and air can flow more easily than the abrasive introduction hole when the abrasive is stored in the storage tank. (2) The exhaust means is provided so as to be connected to the discharge port side of the polishing material introduction hole of the second air supply pipe. (3) The pneumatic shot blasting device according to the above (1), The air shot blast device according to the above (1) or (2), wherein the air inlet / outlet of the air means is provided so as to face above the abrasive material stored in the storage tank. 4) The above (1) to (1) to (1) to (1), wherein an air flow rate adjusting mechanism is provided on the discharge port side of the connection portion with the second air supply tube in the first air supply tube.
The gist is the pneumatic shot blasting device according to any one of (3).

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a view showing an example of the pneumatic shot blasting apparatus of the present invention, and FIG. 1 is a schematic sectional view of a main part of the pneumatic shot blasting apparatus of the present invention. 1 is an abrasive material storage tank, 2 is a first air supply pipe, 3 is a second air supply pipe, 4 is an exhaust means, 5 is a discharge port of the first air supply pipe, and 6 is a second air supply pipe. A discharge port of the pipe, 7 is a polishing material introduction port of the second air supply pipe, 8 is an air inlet / outlet of the exhaust means, 9 is a connecting portion between the first air supply pipe and the second air supply pipe, and 10 is a connection part. 5 shows a connecting portion between the second air duct and the exhaust means.

An air 12 is connected to the end 11 of the first air tube so that air can flow therethrough on the side opposite to the storage tank side of the connection portion of the first air tube with the second air tube. The compressor 14 is a discharge nozzle connected to the discharge port 6 of the second air pipe so as to allow the abrasive and the air to flow therethrough. 1
5 is an abrasive material. In addition, 1a is a container which constitutes the abrasive material storage tank 1, and 1b is a lid capable of sealing the opening of the container 1a.

An air passage opening / closing mechanism such as a solenoid valve and an air pressure adjusting mechanism (not shown) such as a regulator are usually provided between the end 11 of the first air supply pipe 2 and the compressor 12. By operating the air flow opening / closing mechanism, the air flow path can be opened to discharge the abrasive, or the air flow path can be closed to stop the discharge of the abrasive.

As shown in FIG. 1, the pneumatic shot blasting apparatus of the present invention comprises a polishing material storage tank 1, a first air supply pipe 2 having a discharge port 5 facing the storage tank 1, The first air pipe 2 has an abrasive material introduction hole 7 which is connected to the first air pipe 2 so that air can flow therethrough, passes through the inside of the storage tank 1 and communicates with the inner cavity of the pipe in the storage tank, and is provided outside the storage tank. And a second air supply pipe 3 through which the abrasive material 15 is discharged together with air from a discharge port 6 facing the second air supply pipe.

The inside of the tank 1 is closed except for the discharge port of the first air supply pipe, the abrasive introduction port of the second air supply pipe, and the air inlet / outlet of the exhaust means. It is configured to be possible. The cleaning material storage tank 1 is usually composed of a container 1a and a lid 1b capable of sealing the opening of the container 1a, but the present invention is not limited to such an embodiment.

The discharge port 5 of the first air supply pipe 2 in the abrasive material storage tank 1 may be above the layer of the abrasive material 15 or may be buried in the layer of the abrasive material 15. In the discharge port 5,
A filter 16 may be provided to prevent backflow of the abrasive material 15. However, even if the discharge port 5 is located at any of the above positions, the abrasive material rarely flows backward without providing the filter 16, so that this filter 16 is rather used.
It is effectively used as a silencer for reducing noise such as air rubbing noise generated when compressed air is discharged from the discharge port 5.

The second air pipe 3 has an abrasive material introduction hole 7 therein.
Exhaust means 4 is connected to the discharge port 6 side, and the air inlet / outlet 8 of the exhaust means 4 is provided so as to face above the upper surface 15a of the abrasive material 15 stored in the storage tank.

In the present invention, it is sufficient that the exhaust means 4 is connected to the second air supply pipe 3 so that air can flow therethrough, and as described above, the exhaust means 4 is not necessarily located closer to the discharge port 6 than the polishing material introduction hole 7. It does not need to be connected. However, when the exhaust means 4 is connected to the discharge port 6 side rather than the cleaning material introduction hole 7, fine adjustment of the cleaning material discharge amount becomes easier as compared with other cases, and It is possible to more reliably prevent the abrasive material from staying in the air feeding pipe 3.

As an example of the case where the exhaust means 4 is connected to the discharge port 6 side with respect to the polishing material introduction hole 7, as shown in FIG. 1, the connection between the exhaust means 4 and the second air supply pipe 3 is made. In addition to the embodiment in which the unit 10 is provided in the storage tank 1, as shown in FIG. 2, the embodiment in which the connecting unit 10 between the exhaust unit 4 and the second air duct 3 is provided outside the storage tank 1 Is mentioned. In this embodiment, the exhaust means 4 passes through the layer of the abrasive material 15 when the air outlet / exit faces the storage tank 1 as shown by a solid line in the drawing, As shown,
Although there is a mode in which the layer does not pass through the layer of the abrasive material 15, any mode may be used in the present invention.

It is to be noted that two or more polishing material introduction holes may be provided. In this case, it is assumed that the exhaust means 4 is provided closer to the discharge port 6 than the polishing material introduction hole. This means that it is provided on the discharge port 6 side further than the abrasive-cleaning material introduction hole located at a position close to the 6 side.

In the present invention, the exhaust means 4 is provided so that air can flow more easily than the abrasive material introduction hole 7 when the abrasive material 15 is stored in the storage tank 1. It is sufficient that the present invention is not necessarily limited to the above-described embodiment. In the present invention, it is preferable that the abrasive material is prevented from entering the second air duct 3 from the air inlet / outlet 8 as much as possible. If there is, for example, when the inner diameter of the second air pipe 3 is 5 mm or more, if the maximum particle size is steel polishing material having a size of about 0.3 to 1.0 mm, if the weight is up to about 50 g, If it gets in, it doesn't hurt. Since the second air pipe 3 is not clogged, there is no problem in air circulation, and in a state where the cleaning material 15 is stored in the storage tank 1, the exhaust means 4 is connected to the cleaning material introduction hole 7. Air circulation is easier than that. Conversely, if the second air duct 3 is clogged, the air circulation naturally becomes difficult.

As another mode in which the air inlet / outlet 8 is provided, specifically, for example, if a filter 17 which cannot pass the abrasive material is provided in the air outlet / outlet 8 of the exhaust means 4, as shown in FIG. Part 8 is the abrasive material 1 in the storage tank 1
5 may be buried below the upper surface 15a.

However, also in this case, the exhaust means 4 must be provided so that the air can flow more easily than the polishing material introduction hole 7, but such a construction is practically a filter. An air inlet / outlet 8 provided with an air inlet 17 is provided at a position higher than the polishing material inlet 7, and in such a configuration, air in the storage tank 1 is filtered by the filter 17.
Is passed through and flows into the second air pipe 3, the resistance of the air passing through the layer of the abrasive material 15 in the storage tank and the abrasive material introduction hole 7 into the second air pipe 3. Specifically, for example, the filter 17 is designed by appropriately combining the size of the opening of the filter 17 and the opening area ratio condition with the height position condition of the air inlet / outlet 8 so as to be smaller than the resistance received when flowing into the filter 17. Or increasing the inner diameter of the exhaust means 4,
At the same time, the second portion on the discharge port 6 side from the connecting portion 10
This is satisfied by, for example, increasing the diameter of the air pipe 3.

Whether or not the exhaust means 4 allows easier air flow than the cleaning material introduction hole 7 can be determined by, for example, installing a flow meter or the like at the air inlet / outlet 8 and the polishing material introduction hole 7 to reduce the air flow rate. Measure and compare, or install a gas detector tube or test paper in the connection part 10 and the abrasive material introduction hole 7 to flow a reactive gas, observe changes in the detector tube or test paper, and compare. And so on.

However, as shown in FIG. 1 and described above,
It is preferable that the air inlet / outlet 8 is provided so as to face above the upper surface 15a of the abrasive material 15 stored in the storage tank.
In this embodiment, the introduction of the abrasive material from the air inlet / outlet 8 can be prevented, and the air flow through the air inlet / outlet 8 is easier than that of the abrasive material introduction hole 7, so that the clogging of the abrasive material can be more reliably prevented. Can be. In this case as well, if the filter 17 is provided at the air inlet / outlet 8, the effect of preventing the abrasive material from clogging is further ensured. However, as described above, when the inner diameter of the second air pipe 3 is 5 mm or more, the maximum Particle size 0.3-1.0m
In the case of a steel polishing material having a size of about m, if the weight is up to about 50 g, it may be contained. Of course, in the present invention, the number of the air ports 8 is not limited to one,
Two or more may be used.

In the present invention, it is preferable that an air flow adjusting mechanism 18 is provided on the discharge port 5 side of the connection portion 10 with the second air tube 3 in the first air tube 2.

The conventional shot blasting apparatus is also usually provided with an air flow control mechanism. Conventionally, however, a pipe having a tip facing the inside of the tank and a pipe branching from the pipe and passing through the tank are used. It was provided on the side of the branch pipe rather than the connection with the branch pipe whose tip faced outside the tank.

In the present invention, the air flow rate adjusting mechanism may be provided at the same position as the above-described conventional one.
It is preferable to provide it on the side, since the amount of the abrasive blown out can be accurately adjusted to a desired value and a wide range can be adjusted.

Specifically, for example, a valve or the like is used as the air flow rate adjusting mechanism. With the above-described configuration, the amount of the abrasive cleaning material directly reacts to the opening and closing amount of the valve. For example, as shown in FIG.
When the% is reduced, the discharge amount of the cleaning material is reduced by 10%, such that the response is almost proportional to the throttle amount of the valve. In other words, if the opening amount of the valve is increased by 10%, the discharge amount of the abrasive material is increased by 10%, so that it reacts almost in proportion to the opening amount of the valve. Therefore, when the discharge amount of the cleaning material is adjusted, it is possible to adjust the discharge amount of the cleaning material to a desired value, as compared with the case where the conventional structure is employed, since the value can be adjusted to an accurate value by adjusting the degree of throttle of the valve. There are advantages.

Further, the relationship between the throttle amount of the valve and the discharge amount of the abrasive material has better reproducibility than that in the case where the conventional structure is employed, and the relationship between the first time the valve is narrowed by 10% is improved. If the discharge amount of the cleaning material is reduced by, for example, 10%, the behavior that the discharge amount of the cleaning material is surely reduced by 10% even when the valve is squeezed by 10% in the same manner as the second time. 3
The same trajectory is shown even in the valve operation after the first time.

Further, since the discharge amount of the polishing material reacts in proportion to the opening and closing amount of the valve, the adjustment range of the discharge amount of the cleaning material has the same range as the allowable range of the opening and closing amount of the valve. There is an advantage that a wide range of adjustment can be performed as compared with the case.

Incidentally, at the conventional valve position, the relationship between the throttle amount of the valve and the discharge amount of the abrasive is a pseudo-inversely proportional relationship.
For example, as shown in FIG. 5, when the valve is squeezed by 10% regardless of the squeezed state of the valve, the discharge amount of the abrasive is 1%.
It cannot be said that the change is 0% (“increases” in the conventional structure), and the change rate of the abrasive discharge amount changes to 10% or 5% as the throttle amount of the valve changes. Was. That is, the abrasive discharge amount appears in a certain range α (α changes with respect to the valve throttle amount) with respect to the value of the valve throttle amount (opening amount), and the reproducibility was poor.
Furthermore, in the conventional case, since the rate of change of the abrasive discharge amount was small compared to the throttle amount of the valve, the adjustment range of the abrasive discharge amount was narrow even when the throttle range of the valve was fully used. .

In the present invention, it is considered that a synergistic effect is provided with the provision of the exhaust means 4. However, when the air flow rate adjusting mechanism 18 is provided as described above, the discharge amount of the polishing material is unexpectedly increased. The subtle adjustment of is also possible.

In the present invention, the air flow rate adjusting mechanism may be provided inside the polishing material storage tank, or may be provided inside and outside the polishing material storage tank.

In the present invention, an exhaust valve (not shown) capable of an exhaust operation with an exhaust port 20 facing the outside of the storage tank 1 on the discharge port 5 side of the air flow adjusting mechanism 18 of the first air supply pipe 2. Can also be provided. In this way, the air in the storage tank 1 can be discharged from the exhaust valve to the outside of the tank as necessary, so that the abrasive material can be further retained in the second air supply pipe 3. It can be reliably prevented. When performing the exhaust operation from the exhaust valve,
It is preferable that the discharge port 5 is above the layer of the abrasive material 15 or that the discharge port 5 is provided with a filter 16. With such a configuration, there is no danger of the abrasive material flowing back into the first air supply pipe 2 to block, for example, the air flow rate adjusting mechanism 18 even during the exhaust operation from the exhaust valve. .

[0037]

As described above, the pneumatic shot blasting apparatus of the present invention comprises an abrasive material storage tank, a first air supply pipe having a discharge port facing the storage tank, The air supply pipe is connected to the air supply pipe so that air can flow therethrough, and has a polishing material introduction hole that passes through the storage tank and communicates with the lumen of the pipe in the storage tank, and the discharge port faces the outside of the storage tank. A second air supply pipe through which an abrasive is discharged together with air from an outlet, wherein the second air supply pipe is provided with exhaust means provided with an air inlet / outlet in a storage tank. It is configured such that air pipes and air can be circulated and air is easier to circulate than the blasting material introduction hole in a state where the blasting material is stored in the storage tank. Therefore, when the discharge of the cleaning material is stopped, the cleaning material is accumulated in the second air duct. It is not to be. Therefore, the next time the abrasive is discharged, a stable discharge state close to the steady discharge state can be created even in the initial period of discharge of the abrasive, with respect to the discharge amount of the abrasive, the discharge pressure, and the like. Thus, according to the apparatus of the present invention, there is an effect that stable shot blasting can be performed from the initial discharge to the steady discharge state.

In the above-described air-type shot blasting apparatus, the case where the exhaust means is provided on the discharge port side of the polishing material introduction hole of the second air supply pipe is provided. Compared with this, it is easier to finely adjust the discharge amount of the cleaning material, and it is possible to more reliably prevent the cleaning material from staying in the second air pipe 3.

Further, in the above-mentioned pneumatic shot blasting apparatus, when the air inlet / outlet of the exhaust means is provided so as to face above the abrasive material stored in the storage tank, the present invention is applicable. Can be easily implemented,
There is an advantage that the effects described above can be obtained easily and reliably.

In the above-described pneumatic shot blasting apparatus, when the air flow adjusting mechanism is provided on the discharge port side of the first air supply pipe with respect to the connection portion with the second air supply pipe, the grinding is performed. There is an advantage that it is easy to accurately adjust the sweep material discharge amount to a desired value. Furthermore, the relationship between the adjustment amount of the air flow adjustment mechanism and the discharge amount of the abrasive material has better reproducibility compared to the case where the conventional structure is adopted, and the value can be accurately determined even if the same conditions are repeatedly set. The advantage is that it can be reproduced. Further, there is an advantage that the discharge amount of the abrasive can be adjusted in a wider range as compared with the conventional case. Further, there is an advantage that fine adjustment of the discharge amount of the abrasive can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an example of an air-type shot blasting apparatus of the present invention.

FIG. 2 is a diagram illustrating another example of a position where an exhaust unit is provided.

FIG. 3 is a diagram showing a mode in which an air inlet / outlet of an exhaust unit is provided.

FIG. 4 is a relationship diagram showing a relationship between a valve opening amount and a polishing material discharge amount when an air flow rate adjusting mechanism is provided on a first air supply pipe side.

FIG. 5 is a relationship diagram showing a relationship between a valve opening amount and a polishing material discharge amount when an air flow rate adjusting mechanism is provided on a second air supply pipe side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Abrasive material storage tank 2 1st air sending pipe 3 2nd air sending pipe 4 Exhaust means 5 Discharge port 6 Discharge port 7 Abrasive material introduction hole 8 Air inlet / outlet 9 1st air sending pipe and 2nd sending Connection part with empty pipe 10 Connection part between second air supply pipe and exhaust means 15 Abrasive material 18 Air flow control mechanism

Continuation of the front page (56) References JP-A-2-190263 (JP, A) JP-A-8-1555837 (JP, A) Jiko 13-17505 (JP, Y1) (58) Fields investigated (Int) .Cl. ⁷ , DB name) B24C 7/00

Claims (4)

(57) [Claims] 1. A polishing material storage tank, a first air supply pipe having a discharge port facing the storage tank, and a first air supply pipe connected to the first air supply pipe so that air can flow therethrough. A second air supply having a polishing material introduction hole passing through the storage tank and communicating with the lumen of the pipe in the storage tank, and the cleaning material is discharged together with air from a discharge port facing the outside of the storage tank. A pipe, and an exhaust means having an air inlet / outlet in the storage tank in the second air supply pipe, and air can flow through the second air supply pipe and in the storage tank. An air-type shot blasting device, wherein the air-blast blast device is provided so that air can flow more easily than the abrasive-cleaning material introduction hole when the abrasive material is stored. 2. The pneumatic shot blasting apparatus according to claim 1, wherein the exhaust means is provided so as to be connected to the discharge port side of the polishing material introduction hole of the second air supply pipe. 3. The pneumatic shot blasting apparatus according to claim 1, wherein the air inlet / outlet of the exhaust means is provided so as to face above the abrasive material stored in the storage tank. . 4. The air flow control mechanism according to claim 1, wherein an air flow rate adjusting mechanism is provided on the discharge port side of the first air supply pipe with respect to a connection portion with the second air supply pipe. The air-type shot blasting device according to 1.