JP4146643B2 - Pressure feeding device and wet blasting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pressure feeding device and a wet blasting device.
[0002]
[Prior art and problems to be solved by the invention]
Wet blasting device 22 that pressurizes slurry 20 in which abrasive grains are mixed with liquid, mixes with compressed air, and injects it onto workpiece 21 is becoming popular as a physical processing device friendly to the global environment that does not use chlorofluorocarbon or ethane. (Refer to FIG. 1. Note that the same reference numerals are given to the same components as in the embodiment.)
[0003]
By the way, in this wet blasting apparatus, it is important to reduce the size and increase the output of a pumping device (pump) for pressurizing and feeding the slurry 20.
[0004]
As shown in FIG. 2, the pressure feeding device for the wet blasting apparatus generally has a slurry 20 on the inner surface of the main body 41 and from the central portion to the inner surface side of the main body 41. The guiding flanges 6a and 6b are provided in a protruding state with a predetermined distance in the passing direction of the slurry 20 (vertical direction in FIG. 2), and a conveying unit that conveys the slurry 20 inside the main body 41 10 is provided, and a rotating shaft 3 is provided at the center of the transport unit 10, and a single disk-shaped rotating body 4 is positioned between the flanges 6a and 6b. A passage portion 2b through which the slurry 20 passes is provided between the outer end (left and right ends in FIG. 2) of the rotating body 4 and the inner surface of the main body 41 between the flange portions 6a and 6b. On the lower surface of the body 4, the slurry 20 is pushed to the inner surface side of the main body 41 (the peripheral wall surface side of the transport unit 10) by the rotation of the rotating body 4. (The rotating body 4 with the pressing piece 5 is called an impeller.) The flange portion 6b on the upper surface side of the rotating body 4 includes the flange portion 6b and the rotating body. Guide protrusions 7 for guiding the slurry 20 guided between the upper side of the rotating body 4 and the upper surface of the rotating body 4 are provided on the upper surface of the rotating body 4. This is a configuration in which a single fixed plate 9 that prevents centrifugal force due to rotation is provided in a state of being opposed to the rotating body 4 (hereinafter referred to as a conventional example. In addition, the same components as in the embodiment are the same) A reference is attached.)
[0005]
Accordingly, the slurry 20 is guided by the lower surface of the flange portion 6a located on the lower surface of the rotating body 4 and guided to the rotating shaft 3 side, and then is pressurized by the rotation of the rotating body 4 while the slurry portion 6a. Is guided to the outer side of the rotating body 4 and is guided to the lower surface of the flange 6a located on the upper surface of the rotating body 4 to be guided again to the rotating shaft 3 side. (See symbol P in FIG. 2).
[0006]
However, in this conventional example, since the slurry 20 is a mixture of liquid and abrasive grains, a difference in the passing speed between the two tends to occur due to the difference in specific gravity between the two. Abrasive grains are likely to stay in the passage portion 2b between the flange portions 6a and 6b and the inner surface of the main body 41. Therefore, the ratio of the liquid and the abrasive grains in the slurry 20 to be pumped (the concentration of the abrasive grains) is stable. Further, there is a problem that the pumping amount of the slurry 20 pulsates and the processing accuracy deteriorates.
[0007]
The present invention solves the above problems and provides a pumping device and a wet blasting device excellent in practicality capable of pumping slurry in a stable state.
[0008]
[Means for Solving the Problems]
The gist of the present invention will be described with reference to the accompanying drawings.
[0009]
A pumping device that pumps a slurry 20 in which abrasive grains are mixed with a liquid. A rotary shaft 3 is provided inside the main body 1, and a pair of flanges 6a and 6b for guiding the slurry 20 passing therethrough are provided with the slurry. provided passage direction 20, the the rotary shaft 3 is rotating body 4 is provided, the rotary body 4 is provided so as to be positioned between the front Kitsuba portion 6a · 6b, the this rotary body 4 body each passage part 2a · 2b · 2c is provided between and between front and rear surfaces of the rotating body 4 and a slurry passing direction of the first inner surface and the flange portion 6a · 6b, the main body 1 and the rotary body 4 the passage portion 2b between the inner surface, the slurry 20 the slurry 20 to be introduced from the passage portion 2a between the slurry passing direction of the front surface of the rotating member 4 and the collar portion 6a collide and the slurry passing direction of the rear surface of the rotating body 4 and the flange portion 6b Induction unit 8 for inducing to the passing portion 2c is provided between, the induction portion 8 is constituted by a ridge which extends to the slurry passage direction, the ridges in the inner surface of the main body 1 it relates to a pumping device, characterized in that in the circumferential direction are juxtaposed at predetermined intervals.
[0010]
Further, the pumping device according to claim 1, wherein the pair of flange portions 6a · 6b are plural sets juxtaposed, wherein the rotary shaft 3 provided with a plurality the rotating body 4 is located between the respective flange portions 6a · 6b The present invention relates to a pressure feeding device.
[0011]
Further, the pumping device according to any one of claims 1, 2, wherein the rotary body 4, the passage portion 2a between the slurry passing direction of the front and the collar portion 6a of the rotating body 4 and characterized in that the slurry 20 that has been induced the pressing piece 5 pushed into the passing portion 2b between the rotating body 4 and the body 1 of the inner surface by the rotation of the rotating member 4 is provided This relates to the pressure feeding device.
[0012]
The pressure feeding device according to any one of claims 1 to 3, wherein a fixing plate 9 is provided on the rear surface side of the rotating body 4 in the slurry passing direction. It is concerned.
[0013]
Further, in the pressure feeding device according to any one of claims 1 to 4, an introduction port 11 for sucking the slurry 20 is provided at a lower portion of the main body 1, and a mesh material 15 is attached to the introduction port 11. The present invention relates to a pressure feeding device .
[0014]
Further, the pumping device according to any one of claims 1 to 5, the front surface of the slurry passage direction by the collar portion 6a · 6b guide flange 7 for guiding the passage of the slurry 20 is provided, the guide flange 7 and the guide portion 8 is intended according to the pumping device, characterized in that it is continuously provided.
[0015]
Also, wet blast apparatus characterized by being configured such that the slurry 20 is delivered from the pumping device according to any one of claims 1 to 6 is injected it is mixed with compressed air in the work 21 It is related to.
[0016]
[Action and effect of the invention]
The slurry 20 sent to the passage portion 2b between the outer end of the rotator 4 and the inner surface of the main body 1 due to the rotation of the rotator 4 collides with the guide portion 8 provided in the passage portion 2b and rotates. It is satisfactorily guided to the rear surface side of the body 4 (rear surface side in the passing direction of the slurry 20).
[0017]
Thus, the liquid in the slurry 20 is also abrasive also without or staying in the passage portion 2b between the outer edge and the inner surface of the main body 1 of the rotary member 4, stably on the rear side of the slurry passing direction of the rotary body 4 Therefore, stable pumping of the slurry 20 can be realized.
[0018]
By the way, the multi-stage type pressure feeding device provided with a plurality of flanges 6 and the rotating body 4 as in the invention described in claim 2 is a pumping method for simply pumping a liquid as it is easy to downsize and increase the output of the device. Although used as an apparatus, since the transport path is further complicated, there is a problem that the abrasive grains are likely to stay when the slurry 20 in which the abrasive grains are mixed with the liquid is used. However, according to the present invention, even with such a multistage pumping device, the slurry 20 can be stably pumped by the presence of the guiding portion 8.
[0019]
Since this invention was comprised as mentioned above, it becomes the technique excellent in the practicality which can pump a slurry in the stable state.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
3 to 5 illustrate one embodiment of the present invention, which will be described below.
[0021]
The illustrated main body 1 employs a configuration in which the slurry 20 is sucked from an introduction port 11 provided in the lower portion and the pressurized slurry 20 is led out from an outlet port 12 provided in the upper portion. Therefore, the passage direction of the slurry 20 in FIG.
[0022]
The main body 1 has a cylindrical configuration in which a plurality of cylinders 14 (four in the drawing) of a predetermined length are connected below a base body 13 provided with the outlet 12, and the internal space portion is a slurry. 20 is set in the conveyance unit 10 to be conveyed.
[0023]
The lower opening of the cylindrical body 14 located at the lowest position is set at the introduction port 11.
[0024]
The introduction port 11 is provided with a mesh material 15 for preventing dust and the like from entering the main body 1 together with the slurry 20.
[0025]
A motor 23 is provided on the upper part of the main body 1, and a rotating shaft 3 connected to the motor 23 projects from the transport unit 10. The rotating shaft 3 is disposed on the central axis of the cylindrical body 14.
[0026]
The inner surface of each cylindrical body 14 has a slurry passing direction for guiding the slurry 20 passing through the transport unit 10 to the rotating shaft 3 side and the opposite side (the inner surface side of the main body 1, that is, the peripheral wall surface side of the transport unit 10). The flange portions 6 whose front and rear surfaces are respectively tapered are provided in a protruding state.
[0027]
Wherein the the rotary shaft 3 to be between the upper and lower flange portion 6 comrades position, disc-shaped rotary body 4 is rotated by the rotary shaft 3 are respectively attached. In the drawings, the rotating body 4a is provided between the first collar part 6a and the second collar part 6b from below and between the second collar part 6b and the third collar part 6c from below. -Although 4b is provided, the case where the rotary body 4 is not provided between the 3rd collar part 6c and the 4th collar part 6d from the downward direction is illustrated.
[0028]
The multistage type pressure feeding device provided with a plurality of the rotating bodies 4 is pressurized each time the slurry 20 passes through one rotating body 4, so that even if the rotating body 4 has a small diameter (ie, pressure feeding). Even if the entire apparatus is small), even if the rotating body 4 is rotating at a low speed, high output (the action of increasing the pressure of the slurry 20) can be achieved, but the conveying path of the slurry 20 becomes complicated. For this reason, the difference in the ease of passage between the liquid and the abrasive grains is more likely to occur than in the conventional example, and the passage 2b between the outer end of the rotating body 4 and the upper and lower flanges and the inner surface of the main body 1. In this case, the abrasive grains were likely to stay.
[0029]
On the lower surface of the rotating body 4, there is a pushing piece 5 that pushes the slurry 20 to the outer end side (the peripheral wall surface side of the conveying section 10) of the rotating body 4 by the rotation of the rotating body 4. Are provided radially.
[0030]
The slurry 20 passing therethrough collides with the passage 2b between the outer end of the rotating body 4 and the upper and lower flanges 6a and 6b and the inner surface of the main body 1 (the peripheral wall surface of the transport unit 10). A guiding portion 8 is provided for guiding 20 to the passage portion 2c between the rotating body 4 and the flange portion 6b located on the upper surface side of the rotating body 4.
[0031]
The guide portion 8 is constituted by a ridge extending in the up-down direction (direction in which the slurry 20 passes). Further, the ridges are arranged side by side on the inner surface of the main body 1 (the peripheral wall surface of the transport unit 10) at a predetermined interval in the circumferential direction (see FIG. 4). Accordingly, the slurry 20 that moves in the conveying unit 10 in a spiral flow state by the rotation of the rotating body 4a passes between the outer end of the rotating body 4a and the inner surface of the main body 1 between the upper and lower flanges 6a and 6b. In 2b, it collides with the guide portion 8 (projection) and is moved well to the upper surface side of the rotating body 4a. That is, the centrifugal force urged to the slurry 20 by the rotation of the rotating body 4a is converted into a moving force upward of the rotating body 4a by the collision with the guide portion 8, and thereby the slurry 20 is smoothly conveyed. .
[0032]
Moreover, this convex line is extended from the lower surface of the rotary body 4a to the downward direction. Therefore, the slurry 20 pushed by the pushing piece 5 surely collides with the ridge, and the guiding action of the slurry 20 by the ridge is surely exhibited.
[0033]
At this time, the surface of the flange portion 6 that faces the lower surface of the rotating body 4 is set to a rising taper surface 16 that is inclined upward toward the proximal end portion of the flange portion 6. The slurry 20 pushed by the above is gradually moved to the upper surface side of the rotating body 4 by contact with the tapered surface 16 of the flange portion 6.
[0034]
Guide protrusions 7 for guiding the slurry 20 guided to the passage 2c between the flange 6 and the upper surface of the rotating body 4 are radially provided on the surface of the flange 6 facing the upper surface of the rotating body 4. (See FIG. 5). Therefore, the slurry 20 that has collided with the ridges is guided as it is by the guide protrusions 7 and is well guided to the rotating shaft 3 side (center side of the transport unit 10) again.
[0035]
In addition, a fixing plate 9 provided on the upper surface of the rotating body 4 located on the lower surface side of the flange portion 6 is connected to the flange portion 6 at a predetermined interval. The fixed plate 9 is subjected to a centrifugal force due to the rotation of the rotating body 4, that is, a force on the opposite side to the rotating shaft 3 side, on the slurry 20 that passes through the upper surface of the rotating body 4 and moves to the rotating shaft 3 side. This is to prevent this from happening. The fixed plate 9 and the rotating body 4 are opposed to each other with a gap that allows the rotating body 4 to slide.
[0036]
Reference numeral 17 denotes a holder for holding the multistage cylindrical body 14, 18 a packing, and 19 a connecting portion for connecting the flange portion 6 and the fixing plate 9.
[0037]
For ease of explanation, the lowermost rotating body 4a and the behavior of the slurry 20 around it are described, but the behavior of the other rotating body 4b and the surrounding slurry 20 is the same.
[0038]
This pumping device is used in a wet blasting device 22 as shown in FIG.
[0039]
In the wet blasting device 22, the slurry 20 pressurized through the pressure feeding device and the separate compressed air are mixed and sprayed onto the work 21.
[0040]
In order to compare the present example with the conventional example, an experiment was conducted using the wet blasting device 22. First, in order to make the same maximum output, the conventional example had to be made larger. . In addition, when a slurry 20 in which abrasive particles having a particle size of about 100 micrometers for rough polishing and water are mixed is used, the concentration of abrasive grains in the injected slurry 20 is about that in the present example and the conventional example. However, the pulsation was larger in the conventional example (the cavitation is considered to be larger because the rotating plate is larger in the conventional example), and the noise level was higher. In addition, in the case of using slurry 20 in which abrasive grains having a particle size of about 5 micrometers for precision polishing and water are mixed, the comparative example is a slurry in which the abrasive concentration is very unstable in addition to the above problems. 20 was injected and the polishing accuracy was lowered, but in this example, the abrasive concentration remained stable and the polishing accuracy was good.
[0041]
Since the present embodiment is configured as described above, the slurry 20 sent to the passing portion 2b between the outer end of the rotating body 4 and the inner surface of the main body 1 by the rotation of the rotating body 4 is transferred to the passing portion 2b. So that the liquid and abrasive grains in the slurry 20 and the inner surface of the main body 1 are in contact with the outer end of the rotating body 4. Without being accumulated in the passage portion 2b between the two, and is guided to the upper surface side of the rotating body 4 with a stable abrasive grain concentration, and is excellent in practicality capable of realizing stable pumping of the slurry 20. It becomes a pumping device.
[0042]
In addition, since the rotating body 4 is provided in multiple upper and lower stages via the flange portion 6, it is possible to increase the slurry 20 without increasing the diameter of the rotating body 4 or increasing the rotational speed of the rotating body 4. It is possible to perform pumping with an output, and therefore, it is possible to achieve both the miniaturization and the high output, and to achieve a pumping apparatus with excellent practicality that can stably pump the slurry 20.
[0043]
Further, even if a strong centrifugal force is applied to the slurry 20 by the pushing piece 5 provided on the rotating body 4, the centrifugal force of the slurry 20 moves upward of the rotating body 4 due to the collision with the guide portion 8. Therefore, it is possible to obtain a pumping apparatus excellent in practicality that can stably pump the slurry 20 in this respect as well.
[0044]
Further, since the fixed plate 9 is attached to the upper surface of the rotating body 4, the slurry 20 can be favorably moved toward the rotating shaft 3 on the upper surface of the rotating body 4 without being affected by the rotation of the rotating body 4. Thus, in this respect, the pumping apparatus is excellent in practicality and can stably pump the slurry 20.
[0045]
In addition, since the guide portion 8 is constituted by a plurality of protrusions arranged in parallel with the inner surface of the main body 1 at a predetermined interval in the circumferential direction, the guiding portion 8 is formed outside the rotating body 4 and in the entire circumferential direction of the main body 1. Thus, the inductive action of the slurry 20 can be exhibited. Therefore, in this respect as well, a pumping apparatus excellent in practicality capable of stably pumping the slurry 20 is obtained.
[0046]
Further, since the main body 1 has a configuration in which a plurality of cylindrical bodies 14 are continuously provided, the number of the bottomless cylindrical bodies 14 can be varied, the length of the rotating shaft 3 can be varied, and the number of the rotating bodies 4 can be varied. As a result, it is possible to easily obtain a different output, and in this respect, the pumping device is excellent in productivity and versatility.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a wet blasting device 22;
FIG. 2 is a side sectional view illustrating a conventional example.
FIG. 3 is a side sectional view illustrating the present embodiment.
FIG. 4 is an explanatory longitudinal sectional view of a main part of the present embodiment.
FIG. 5 is an explanatory perspective view of a main part of the present embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Main body 2a * 2b * 2c Passing part 3 Rotating shaft 4 Rotating body 5 Pushing piece 6 Gutter part 7 Guide protrusion 8 Guide part 9 Fixing plate
11 introduction port
15 mesh material
20 slurry
21 Work

Claims (7)

A pumping device that pumps a slurry in which abrasive grains are mixed with a liquid, and a rotating shaft is provided inside the main body, and a pair of flange portions for guiding the passing slurry are provided in the passing direction of the slurry, wherein the rotary shaft is rotating body is provided, the rotating body is provided so as to be positioned between the front Kitsuba portion of the slurry passing direction in between and the rotating body and the inner surface of the rotating body and the body each passage portion is provided between the front and rear surfaces and the flange portion, the passage portion between the inner surface of the rotating body and the body, and the slurry passing direction of the front surface of the rotating body and said flange portion guide portion guiding to the passage portion is provided between the said slurry passage direction of the rear surface of the slurry collide introduced from passing unit the rotator the slurry and the flange part between, This guiding portion extends in the slurry passing direction. Is constituted by a ridge, the ridges pumping apparatus characterized by being arranged at a predetermined interval in the circumferential direction in the inner surface of the body. In pumping device according to claim 1, wherein the pair of flange portions is plural sets juxtaposed, pumped to the rotating shaft and said rotating body located between the respective flange portions is provided with a plurality of devices . In pumping device according to any one of claims 1, 2, wherein the rotating body, the slurry that has been induced in the passage portion between the front and the collar portion of the slurry passing direction of said rotary body the pumping apparatus characterized by pressing piece for pressing the passage portions between the inner surface of the main body and the rotating body by the rotation of the rotating body is provided. The pumping device according to any one of claims 1 to 3, wherein a fixed plate is provided on the rear surface side of the rotating body in the slurry passing direction . 5. The pumping device according to claim 1, wherein an inlet for sucking the slurry is provided in a lower portion of the main body, and a mesh material is attached to the inlet. Pumping device. In pumping device according to any one of claims 1 to 5, the front surface of the slurry passage direction by the collar portion guide protrusion is provided to guide the passage of the slurry, the induction and the guide protrusion A pressure feeding device characterized in that it is connected to the section. A wet blasting apparatus, wherein the slurry fed from the pumping device according to any one of claims 1 to 6 is mixed with compressed air and jetted onto a workpiece.

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