JP2001300363A - Nozzle body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightly practical nozzle body by which a homogeneous mixture of abrasive grains, liquid and pressurized air is jetted even from an extremely long-sized slit jetting port in spite of its simple structure. SOLUTION: In the nozzle body, an air jetting passage 2 is provided close to a slurry storage chamber 1 into which a slurry mixed with the abrasive grains and the liquid are introduced and temporarily stored. Pressurized air is passed through the passage 2 to lead out the slurry from the chamber 1, the slurry and air are sent to a mixing chamber 3 and mixed, the mixture as a jetting material 4 is jetted from a slit jetting port 5. A discharge passage 6 for discharging the slurry from the chamber 1 is furnished in a porous structure pierced with small holes in parallel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nozzle body.

[0002]

2. Description of the Related Art Conventionally, a so-called wet blast obtained by pressurizing a slurry in which abrasive grains and a liquid are mixed with pressurized air is sprayed from a jet port onto a work, and the wet blast is performed by the wet blast. Various proposals have been made on a wet blasting technique for inspecting a work such as a burr treatment and an abrasion test, and various proposals have been made on a nozzle body for satisfactorily spraying the wet blast.

[0003] For example, in order to uniformly process the surface of a large work having a width of 600 mm or the like by a wet blasting technique, a nozzle body for a wet blast in which an injection port of the nozzle body has a long slit shape of a width of 600 mm or more. And a means for simultaneously processing the entire surface of the work as much as possible by moving the work with respect to the nozzle body.

[0004] However, it is very troublesome to spray a wet blast from such a long slit-like spray port in a uniform mixed state. This is because the longer the injection port, the more easily the concentration of the abrasive grains in the slurry becomes thicker or thinner depending on the location.

Therefore, at present, in a nozzle body having a long slit-shaped injection port having a width of 200 mm or more, it is necessary to uniformly mix abrasive particles, liquid, and pressurized air injected from the injection port. However, there is a problem that processing unevenness occurs in the work, and precise processing and inspection cannot be performed.

Accordingly, there is a need in the industry for a nozzle body having a long ejection port and capable of uniformly mixing abrasive particles, liquid, and pressurized air ejected from the ejection port. ing.

SUMMARY OF THE INVENTION The present invention achieves the above-mentioned demand, and has a simple structure, and injects abrasive grains, a liquid and pressurized air in a uniform mixed state even from a very long slit-shaped injection port. It is intended to provide a highly practical nozzle body which can be used.

[0008]

The gist of the present invention will be described with reference to the accompanying drawings.

An air injection passage 2 is provided in the vicinity of a slurry storage chamber 1 in which a slurry in which abrasive grains and a liquid are mixed is introduced and temporarily stored, and a pressurized air passes through the air injection passage 2. A nozzle body for extracting a slurry from the slurry storage chamber 1, sending the slurry and air to a mixing chamber 3, mixing the slurry, and injecting an injection material 4 in which the pressurized air and the slurry are mixed from a slit-shaped injection unit 5 The present invention relates to a nozzle body characterized in that a lead-out passage 6 for leading a slurry from the slurry storage chamber 1 is provided in a porous structure in which small holes are juxtaposed.

Further, in the nozzle body according to the first aspect,
The present invention relates to a nozzle body characterized in that the air injection passage 2 is provided in a porous structure in which small holes are juxtaposed.

Further, in the nozzle body according to any one of claims 1 and 2, the mixing chamber 3 is provided inside the elongated member 7, and the plate member 8 is continuously provided below the elongated member 7. In addition, the present invention relates to a nozzle body characterized in that a passage path 9 for communicating the mixing chamber 3 and the slit-shaped jetting part 5 is provided inside the plate-shaped member 8.

Further, in the nozzle body according to the third aspect,
The present invention relates to a nozzle body characterized in that a fitting member 10 continuously provided in a fitted state is provided on the upper part of the long member 7, and the slurry storage chamber 1 is provided inside the fitting member 10. is there.

The nozzle body according to any one of claims 1 to 4, wherein the passage through which the slurry passes is covered with a protective layer 11 made of urethane resin. It is.

[0014]

An air injection passage 2 is provided near a slurry storage chamber 1 in which a slurry in which abrasive grains and a liquid are mixed is introduced and temporarily stored. A pressurized air flows through the air injection passage 2. By passing the slurry, the slurry is drawn out of the slurry storage chamber 1, the slurry and the air are sent to the mixing chamber 3 and mixed, and the pressurized material 4 in which the pressurized air and the slurry are mixed is discharged from the slit-shaped injection unit 5. Conventionally, as disclosed in Japanese Patent Application Laid-Open No. Hei 7-186050, which is filed by the inventor of the present invention, a discharge passage for discharging the slurry from the slurry storage chamber 1 has the same width as the injection unit 5. It was provided in a length slit structure.

When the outlet passage of the long slit structure is provided in a porous structure in which small holes are juxtaposed, the ejection material 4, that is, the abrasive grains, the liquid, and the pressurized air are uniformly distributed from the entire ejection section 5. It was confirmed that the fuel was injected in a mixed state.

The reason why this effect can be obtained is not clear, but when the outlet passage has a long slit structure as described in Japanese Patent Application Laid-Open No. Hei 7-186050, the pressure of the slurry passing through the outlet passage is not sufficient in the longitudinal direction. It is easy to be uniform, and the longer the length, the greater the degree of non-uniformity. However, if the lead-out passage 6 has a porous structure in which small holes are juxtaposed as in the present invention, the slurry passing through each small hole has The pressure is uniform in the small holes, and further, when the slurry is sent from the slurry storage chamber 1 to the discharge passage 6, the pressure is reduced by the small holes (since the pressure is increased). The pressure passing through the small holes becomes uniform, so that the slurry is uniformly sent to the mixing chamber 3 in the entire outlet passage 6, so that the slurry and the pressurized air are uniformly mixed in the mixing chamber 3. Mixed Becomes the injection material 4, it is believed that the injection material 4 is injected from the slit-shaped injection portion 5.

Since the present invention is constructed as described above, it has a simple structure in which the lead-out passage is provided in a porous structure in which small holes are juxtaposed. A highly practical nozzle body that can be sprayed in a mixed state.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS The drawings illustrate one embodiment of the present invention and will be described below.

In this embodiment, an air injection passage 2 is provided near a slurry storage chamber 1 in which a slurry in which abrasive grains and a liquid are mixed is introduced and temporarily stored. Is passed through the slurry storage chamber 1 to derive a slurry, and the slurry and air are sent to the mixing chamber 3 for mixing.
A nozzle body that injects an injection material 4 (wet blast) in which the pressurized air and the slurry are mixed from a slit-shaped injection unit 5, wherein a lead-out passage 6 that leads the slurry from the slurry storage chamber 1 has a small hole. Are provided in a porous structure having juxtaposed.

The nozzle body has a long member 7 which is long in the width direction (left-right direction) and short in the front-rear direction, and a long member which is long and thin in the width direction and is continuously provided vertically below the long member 7. It is composed of a plate-shaped member 8 and a block-shaped fitted member 10 which is connected to the upper part of the elongated member 7 in a fitted state.

A mixing chamber 3 is provided inside the elongated member 7, and an air injection passage 2 for introducing pressurized air into the mixing chamber 3 is provided above the mixing chamber 3. The outlet passage 6 is provided on one side (left side in FIG. 2), and a lower opening communicating with the injection unit 5 is provided below the mixing chamber 3.
There are twelve.

A projection 31 is provided vertically on the upper inner wall of the mixing chamber 3, and an opening of the air injection passage 2 on the mixing chamber 3 side is provided at a lower end of the projection 31. The opening of the air injection passage 2 on the mixing chamber 3 side is set to be lower than the opening of the outlet passage 6 on the mixing chamber 3 side. With this configuration, when pressurized air is supplied from the air injection passage 2 to the mixing chamber 3, the pressurized air is moved downward to mix the opening of the air injection passage 2 on the mixing chamber 3 side with the discharge passage 6. A negative pressure is generated between the openings on the chamber 3 side, so that the slurry is sucked from the opening on the mixing chamber 3 side of the outlet passage 6 and drawn out into the mixing chamber 3. Pressurized air will be mixed.

The other side (the right side in FIG. 2) of the mixing chamber 3 is also formed in the same structure (a porous structure 13 in which small holes are juxtaposed) with one side of the mixing chamber 3 (the left side in FIG. 2). ing. This is to make the long member 7 symmetrical in the front-rear direction to improve the assemblability of the long member 7. That is, even if the long member 7 is reversed and integrated with the plate-shaped member 8 and the fitted member 10, the lead-out passage 6 is always provided.

The air injection passage 2 is provided in a porous structure in which small holes are juxtaposed similarly to the outlet passage 6. The structure of the air injection passage 2 is described in Japanese Patent Application Laid-Open No. 7-18605.
This is the configuration adopted in No. 0.

The plate-like member 8 is provided therein with a slit-shaped passage path 9 communicating with the lower opening 12 of the mixing chamber 3. The lower part of the passage path 9 is opened, and this opening is formed by the slit-shaped passage. The ejection unit 5 is set.

On the front front and rear surfaces of the plate-like member 8, projections 14 are provided, respectively.

The fitted member 10 is composed of a front body 15 and a rear body 16, and the lower part of the front body 15 and the rear body 16 is engaged with the protruding portion 14 of the plate-like member 8 in a holding state. The holding and locking portions 17 for stopping are provided respectively.

The fitting member 10 is provided with a concave portion 26 that can hold the upper portions of the long member 7 and the plate-like member 8 in a sandwiched state when the front body 15 and the rear body 16 are assembled. I have.

The front body 15 is provided with an air inlet 18 for introducing air at an upper portion thereof, and an air storage chamber 19 for communicating with the air inlet 18 and temporarily storing air is provided therein. Fifteen
At the time of assembling with the rear body 16, a portion that comes into contact with the upper portion of the elongate member 7 is
Is provided with an air passage portion 27 which is communicated with the air injection passage 2.

The rear body 16 is provided with a slurry inlet 21 for introducing a slurry at an upper portion thereof, and a slurry storage chamber 1 for communicating with the slurry inlet 21 and temporarily storing the slurry therein. At the time of assembling, the part which comes into contact with one side of the elongated member 7 (the side where the lead-out passage 6 is provided) is provided from the slurry storage chamber 1 to the lead-out passage 6 of the long member 7.
Is provided with a slurry passage route 22 that communicates with the. In addition, when the rear body 16 is assembled with the front body 15, a portion that comes into contact with an upper portion of the long member 7 is moved from the air storage chamber 19 together with the air passage portion 27 of the front body 15 to the long member. An air passage portion 28 that forms an air passage passage 20 that is communicated with the air injection passage 2 of No. 7 is provided.

The same applies when the front body 15 is provided on the rear side of the long member 7 and the rear body 16 is provided on the front side of the long member 7.

The mixing chamber 3 is provided so as to penetrate the elongate member 7 in the left-right direction. Further, the air storage chamber 19 and the slurry storage chamber 1 are provided so as to penetrate the fitting member 10 in the left-right direction. Have been. Therefore, the mixing chamber 3, the air storage chamber 19, and the slurry storage chamber 1 can be provided by a simple processing means of forming a through hole. Reference numeral 23 denotes a closing member 23 for closing the left and right openings of the mixing chamber 3, the air storage chamber 19, and the slurry storage chamber 1.

The long member 7, the plate member 8, the member to be fitted.
The 10 and the closing member 23 are formed of a material that does not deform as much as possible, for example, a metal material.

In each of the above components, the path through which the slurry passes (the inner wall of the slurry storage chamber 1, the inner wall of the slurry passage 22, the inner wall of the outlet passage 6, the inner wall of the mixing chamber 3, the inner wall of the passage 9 and the injection wall) A protective layer 11 made of urethane resin is coated on the vicinity of the portion 5 and the closed side surface of the closing member 23). This protective layer 11 is for preventing the passage of the slurry from being polished by the slurry (particularly abrasive grains),
It has been confirmed that the existence of the protective layer 11 extends the life of the nozzle body several times.

The urethane resin is also provided as a seal member 24 at a position where the long member 7, plate member 8, fitted member 10 and closing member 23 come into contact with each other. At a predetermined position of the seal member 24, a rib 25 for further improving the sealing performance is provided.

The passage through which only the pressurized air passes (the inner wall of the air storage chamber 19, the inner wall of the air passage 20 and the air injection passage 2) has a configuration in which urethane resin is not provided as much as possible. ing. This is because the urethane resin has a large surface frictional resistance, and the presence of the urethane resin impairs the pressure of the pressurized air due to the contact between the urethane resin and the pressurized air.

In Table 1 below, the work piece 29 (made of aluminum) for the nozzle body of this embodiment having the injection part 5 having a width of 600 mm in the left-right direction and a width of 2 mm in the front-rear direction and the nozzle body according to the embodiment of JP-A-7-186050 is described. Depth of 15
The results of the experiments processed to 0 μm are shown respectively. Table 1-1
Is an example of this example, and Table 1-2 is an example of JP-A-7-186050. Other conditions such as slurry and pressurized air were the same. As described above, it was found that the processing error in the width direction of the workpiece was only about 5% in the nozzle body of the present embodiment, and that extremely uniform processing could be performed.
In the nozzle body according to the example of 86050, the processing error in the width direction of the work was as much as 8%. The processing error of 8% is caused by increasing the circuit density in a multilayer laminated circuit board, etc.
This is a processing error that makes it extremely difficult to achieve high mounting (a processing error that makes fine processing difficult).

[Table 1]

As described above, when various experiments were repeated on the nozzle body of this embodiment, the processing error of the workpiece in the width direction of the injection section 5 was 5 even with the extremely long injection section 5 having a width of 600 mm. %. It was also confirmed that the mixing state of the injection material 4 injected from the injection unit 5 was substantially uniform. The processing error of 5% is a numerical value that can be achieved only in the conventional nozzle body including the jetting part 5 having a width of 200 mm or less, including the above-mentioned Japanese Patent Application Laid-Open No. Hei 7-186050.

The reason why such an effect can be obtained by the structure of the present embodiment is not clear, but is disclosed in Japanese Patent Application Laid-Open No. 7-1860.
When the outlet passage has a long slit structure as in No. 50, the pressure of the slurry passing through the outlet passage becomes non-uniform in the elongate direction. When the lead-out passage 6 has a porous structure in which small holes are juxtaposed as in the present embodiment, the pressure of the slurry passing through each small hole is uniform in the small holes, and the slurry is further discharged from the slurry storage chamber 1. When the small holes are sent to the outlet passage 6, the small holes serve as orifices to reduce the guiding power of the slurry (because the pressure is increased), so that the pressure passing through the small holes in the entire outlet passage 6 becomes uniform, and therefore, The slurry is uniformly sent to the mixing chamber 3 in the entire outlet passage 6, and the slurry and the pressurized air are mixed in the mixing chamber 3 into a uniform mixing state. From the injection part 5 It is considered to be Isa.

Further, in addition to the fact that the pressure passing through the small hole becomes uniform in the whole of the lead-out passage 6,
When the outlet passage has a long slit structure as in 186050, the cross-sectional area of the outlet passage is large, so that the slurry passing through the outlet passage is in a turbulent flow state. On the other hand, if the outlet passage 6 has a porous structure in which small holes are juxtaposed as in the present embodiment, since each small hole has a small cross-sectional area, a slurry passing through the small holes is used. Is in a rectified state, and therefore, the passing speed of the slurry in one small hole does not differ depending on the location. Further, since the slurry passes through all the small holes in a rectified state, the entire outlet passage 6 is The passing speed of the passing slurry does not vary from place to place and becomes as uniform as possible. Therefore, a slurry having a uniform concentration is led out to the mixing chamber 3, and the slurry is uniformly mixed with the pressurized air in the mixing chamber 3. Mixed into a state,
Slit-shaped injection unit 5 as injection material 4 in a uniform mixed state
It is thought that it is injected from.

This effect can be obtained not only when the small holes are circular holes as shown in the figure, but also when the small holes have various shapes such as holes having an elliptical cross section, holes having a rectangular cross section, and holes having a square cross section. It has been confirmed that

Therefore, according to the present embodiment, even if the injection unit 5 is long, the uniform injection material 4 can be injected from the entire injection unit 5.

Further, since the partition wall located between the small holes exerts a reinforcing effect, the dimensional deformation of the lead-out path 6 is prevented as much as possible.

Further, in the nozzle body having this structure, the energy loss of the pressurized air is extremely small (when the pressure of the pressurized air is compared with the flow speed of the spray material 4, the flow speed of the spray material 4 does not significantly decrease. ) Has also been confirmed, and this is presumed to be due to the same reason as the reason why the slurry becomes uniform.

That is, since the air injection passage 2 is provided in a porous structure in which small holes are juxtaposed, the small holes serve as orifices, and the pressurized air passing through the air injection passage 2 is rectified. As a result, the flow velocity of the pressurized air becomes faster and more constant than the pressure of the pressurized air, so that the pressurized air and the slurry are mixed. The sprayed material 4 which is sprayed and sprayed is satisfactorily sprayed on the work, so that the entire surface of the work can be uniformly processed and inspected.

Further, in order to cope with different processing conditions, the pressure of the pressurized air to be used and the type of slurry (material and diameter of the abrasive,
When changing the material of the liquid, etc., it is better to change the shapes of the outlet path 6, the air injection passage 2 and the mixing chamber 3, but in this case, the outlet path 6, the air injection path 2 and the mixing chamber 3 Since all are provided on the long member 7, the nozzle body corresponding to different processing conditions can be easily obtained by replacing only the long member 7.

Further, since the protective layer 11 made of urethane resin is provided on the path through which the slurry passes, the path through which the slurry passes is resistant to polishing, so that the deterioration of the path through which the slurry passes is prevented, and A longer life of the body will be achieved.

Further, a seal member 24 can be provided integrally with the protective layer 11, and the presence of the seal member 24 greatly enhances the airtightness of the joint between the long member 7 and the plate member 8. .

As described above, according to the present embodiment, the spray material 4 is sprayed uniformly from the spray section 5, and the effect is extremely excellent, such as the energy loss of pressurized air is small.
Even with the extremely long ejection section 5, the nozzle body can be processed uniformly and is extremely practical.

[Brief description of the drawings]

FIG. 1 is an explanatory exploded perspective view of the present embodiment.

FIG. 2 is an explanatory side sectional view of the present embodiment.

FIG. 3 is an explanatory plan sectional view of the present embodiment.

FIG. 4 is an explanatory longitudinal sectional view from the rear body 16 side of the present embodiment.

FIG. 5 is an exploded cross-sectional view of a long member 7 and a plate member 8 of the present embodiment.

FIG. 6 is an explanatory perspective view showing a use state of the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Slurry storage chamber 2 Air injection passage 3 Mixing chamber 4 Injection material 5 Injection part 6 Outgoing passage 7 Elongated member 8 Plate member 9 Passage path 10 Fitting member 11 Protective layer

Claims (5)

[Claims] An air injection passage is provided in the vicinity of a slurry storage chamber in which a slurry in which abrasive grains and a liquid are mixed is introduced and temporarily stored, and a slurry is formed by passing compressed air through the air injection passage. A nozzle body that derives a slurry from the storage chamber, sends the slurry and air to a mixing chamber, mixes the mixture, and injects an injection material in which the pressurized air and the slurry are mixed from a slit-shaped injection unit; A nozzle body, wherein a lead-out passage for leading a slurry from a storage chamber is provided in a porous structure in which small holes are juxtaposed. 2. The nozzle body according to claim 1, wherein the air injection passage is provided in a porous structure in which small holes are juxtaposed. 3. The nozzle body according to claim 1, wherein a mixing chamber is provided inside the elongated member.
A nozzle member, comprising a plate-shaped member connected to a lower portion of a long member, and a passage which connects the mixing chamber and the slit-shaped ejection part to each other inside the plate-shaped member. 4. The nozzle body according to claim 3, further comprising: a fitting member continuously provided in a fitted state on an upper portion of the elongated member, wherein a slurry storage chamber is provided inside the fitted member. A nozzle body characterized by the above. 5. The nozzle body according to claim 1, wherein a path through which the slurry passes is covered with a protective layer made of urethane resin.