JPH0938864A - Abrasive supply method and device in abrasive blasting process - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply a quantitative abrasive from a tank to an injection nozzle in a stable state and set the injection amount of a desired abrasive easily and surely. SOLUTION: An abrasive amount adjusting tank 12 is installed downward an abrasive tank 11 for storing an abrasive and an introduction pipe 16 communicated to the bottom of the abrasive tank 11 is inserted in the abrasive amount adjusting tank 12. In the abrasive amount adjusting tank 12, an air layer 18 is formed above the lower end introduction port 19 of the introduction pipe 16 and an abrasive layer 17 is formed consisting of abrasive let flow in downward. A complemental rotary disc 21 on whose circumferential surface a complement part consisting of a recessed part is formed is installed rotatably in the abrasive layer 17 and the abrasive entered in the recessed part on the circumferential surface of the rotating complement rotary disc 21 and complemented is sucked in from the suction port 24 on the rear end in the abrasive supply direction of an abrasive supply pipe 14 installed in close proximity to the circumferential surface of the complement rotary disc 21 and a quantitative abrasive is injected from an injection nozzle 13 to the article to be processed through the abrasive supply pipe 14. A desired supply amount of the abrasive is set easily by adjusting the rotational speed of the complemental rotary disc 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abrasive supply method and apparatus for supplying a fixed amount of abrasive to an injection nozzle from an abrasive tank in blasting. Injecting the abrasive in the abrasive tank quantitatively from the injection nozzle to the workpiece, that is, maintaining a constant injection amount is one of the important blasting conditions for good and stable blasting. The present invention relates to an abrasive supply method and apparatus for quantitatively supplying an abrasive in an abrasive tank to an injection nozzle.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6, an abrasive supply device 40 is provided at a lower portion near the bottom surface of a collection tank 70 for classifying dust from the abrasive and collecting reusable abrasive. A suction pipe 42 passing through the inside from the side wall of the collection tank 70 and penetrating a side wall 71 opposite to the side wall.
And a small-diameter introduction hole 43 is provided above the suction pipe 42. One end of the suction pipe 42 communicates with the injection nozzle 13 via the abrasive supply pipe 14 (FIG. 4), and the other end of the suction pipe 42
Outside of the side wall 71.

[0003] The abrasive in the recovery tank 70 is supplied to the suction pipe 42 through an introduction hole 43 formed in the suction pipe 42.
As it gradually falls into the inside at a substantially constant speed, a mortar-shaped hole as shown by a two-dot chain line in FIG. 6 is formed in the abrasive in the collection tank 70, and this mortar-shaped hole gradually expands. On the other hand, the abrasive dropped from the introduction hole 43 is piled up in the suction pipe 42 so as to form a cone, and the abrasive in the cone is sucked toward the injection nozzle 13 by the airflow flowing in the suction pipe 42. . As described above, the angle of inclination of the mortar-shaped hole and the cone of the abrasive forms a substantially constant angle, and this angle of inclination is referred to as the angle of repose θ. As described above, in order to gradually and quantitatively drop the abrasive from the introduction hole 43 into the suction pipe 42, the diameter of the introduction hole 43 needs to be small.

The above-mentioned abrasive supply device 40 is mounted on a gravity type blasting device 60 as shown in FIG. 4 and FIG. 5, reference numeral 61 denotes a cabinet, which is provided with an input port 63 for taking in and out the workpiece, and a processing machine inserted into the cabinet 61 from the input port 63. An injection nozzle 13 for injecting an abrasive material is provided.

A hopper 68 is provided below the cabinet 61, and the lowermost end of the hopper 68 communicates via a conduit 65 with an upper portion of a collection tank 70 for collecting abrasives installed above the cabinet 61. .

[0006] The recovery tank 70 is a so-called cyclone, which is a device for separating dust from the abrasive, and as shown in FIG.
An inflow port 73 is provided on the upper side wall of the cylindrical portion of the recovery tank 70, which comprises a cylindrical portion having a cylindrical shape at an upper portion, and a conical portion having a conical shape gradually narrowing downward at a lower portion. 73 is connected to the distal end of the conduit 65 via a communication pipe 75. Since the axial direction of the communication pipe 75 is located tangentially to the inner wall surface of the cylindrical portion having a circular cross section, the airflow flowing into the recovery tank 70 from the communication pipe 75 flows along the inner wall of the cylindrical portion. Descends. Collection tank 70
The lower end of the conical portion is provided with an abrasive material supply device 40 for adjusting and supplying the amount of abrasive material injected from the injection nozzle 13, and the abrasive material supply device 40 is connected to the injection nozzle 13 via the abrasive material supply pipe 14. are doing. Note that a pipe 62 for supplying compressed air from a compressed air supply source (not shown) is connected to the injection nozzle 13. A connecting pipe 74 is provided substantially at the center of the upper end wall of the collection tank 70.
Reference numeral 4 communicates with a dust collector 66 via a discharge pipe 67.

[0007] The dust collector 66 rotates an air blower 69 to discharge the air in the dust collector 66 to the outside air. The air in the cabinet 61, the conduit 65, and the collection tank 70 of the blast processing device 60 is sucked by the exhaust fan 69,
Each part becomes a negative pressure, and air supplied from a compressed air supply source (not shown)
From the cabinet 61 in that order.
5. The airflow flows to the collection tank 70 and the dust collector 66.

By supplying compressed air from the compressed air supply source to the injection nozzle 13 through a pipe 62, a negative pressure is generated in the injection nozzle 13 and the abrasive supply pipe 14, and the negative pressure causes a suction pipe 42. The abrasive in the inside is sucked and supplied to the injection nozzle 13 through the abrasive supply pipe 14, and the abrasive and the compressed air are mixed in the injection nozzle 13 and injected from the injection nozzle 13 toward the workpiece. .

[0009]

In the conventional abrasive supply means, the abrasive drops from the abrasive tank including the above-mentioned collection tank 70 and a mere abrasive storage tank for storing the abrasive to the suction pipe 42. Was greatly influenced by differences in the size of the introduction hole 43, the material of the abrasive, the particle size, the specific gravity, and the like. Further, the amount and speed of the abrasive falling from the abrasive tank to the suction pipe 42 may be different when the amount of the abrasive in the abrasive tank is large and small. When the abrasive is sprayed from the spray nozzle toward the workpiece, the non-reusable abrasive that has collided with the workpiece and has been damaged is classified in an abrasive tank, sent to the dust collector 66, and discarded. Therefore, the amount of the abrasive in the abrasive tank decreases as the blasting is performed, so that the amount of the abrasive falling into the suction pipe 42 is not always constant.

Further, since the introduction hole 43 is made small in order to stabilize the amount of the abrasive falling into the suction pipe 42, foreign matter in the abrasive blocks the introduction hole 43 to prevent the abrasive from falling. Or the set amount of abrasive does not drop.

Further, there are abrasives which exhibit fine powder properties and those which do not exhibit fine powder properties. The fine powder property refers to a property in which the abrasive accumulated at the bottom of the abrasive tank exhibits a fine powder state such that the angle of repose θ does not become constant. In addition, the factor that the abrasive exhibits the fine powder property is the material, specific gravity, particle size, and the like of the abrasive.
And the pressure in the abrasive tank. For example,
As an example of an abrasive having a fine powder property when the pressure in the tank is normal pressure, (1) an arandom abrasive material having an apparent specific gravity of 2 to 3 and an abrasive particle size of about # 240 or less (2) In some cases, the abrasive material is steel beads, the apparent specific gravity is 4, and the abrasive particle diameter is about # 600 or less. However, when the pressure in the abrasive tank exceeds normal pressure, the specific gravity and the particle size of the abrasive exhibiting the fine powder property change. For example, when the pressure in the abrasive tank is 5 kg / cm 2, the abrasive material of the alundum type exhibits a fine powder property even when the abrasive particle size is # 150, but the abrasive material of steel beads has the abrasive particle size. Has no fine powder properties at # 300.

When the conventional abrasive supply device 40 is used, the abrasives having the above-mentioned fine powder properties are attracted to each other or adhere to the wall surface of the abrasive tank due to the mutual adhesion characteristic of the fine powder. As a result, the angle of repose θ is not constant, and the abrasive in the abrasive tank has a hole immediately above the introduction hole 43 as shown in FIG. There was a case where the cavity 44 was formed in the upper part and the abrasive could not drop.

As described above, in the conventional abrasive supply method and apparatus, there is a problem that it is difficult to always supply a constant amount of abrasive from the abrasive tank to the spray nozzle.

The present invention has been developed to solve the above-mentioned problems, and provides an abrasive supply method and apparatus for supplying a fixed amount of abrasive from an abrasive tank to a spray nozzle in a stable state. It is still another object of the present invention to provide an abrasive supply method and apparatus capable of easily setting a desired amount of abrasive supply in accordance with the type of abrasive.

[0015]

In order to achieve the above-mentioned object, in the abrasive supply method of the present invention, the abrasive in the abrasive tank 11 flows into the abrasive amount adjusting tank 12,
The abrasive in the abrasive amount adjusting tank 12 is sucked through the abrasive supply pipe 14, and the sucked abrasive is supplied to the injection nozzle 13 through the abrasive supply pipe 14, and the workpiece is processed from the injection nozzle 13. In the blasting process for spraying an object, the collection rotating disk 21 is rotated in the abrasive amount adjusting tank 12 and at least a part of the circumference is buried in the abrasive flowing into the abrasive amount adjusting tank 12. The abrasive is collected on the circumferential surface, and the abrasive is sucked from the suction port 24 of the abrasive supply pipe 14 facing the circumferential surface and supplied to the spray nozzle 13.

Further, in another method of supplying an abrasive according to the present invention, an abrasive layer 17 made of an abrasive flowing into a lower portion in the abrasive amount adjusting tank 12 and an abrasive layer 17 are formed.
A part of the circumference of the collection turntable 21 is buried or exposed in the upper air layer 18 and rotated. In the air layer 18, the abrasive is sucked from the suction port 24 of the abrasive supply pipe 14 facing the circumferential surface of the collection rotary disc 21, and the spray nozzle 13 is
To be supplied to

The abrasive is collected by a collecting portion formed on the circumferential surface of the collection rotating disk 21 in the abrasive amount adjusting tank 12, and the collected abrasive is supplied to the abrasive supply pipe 14. Suction from the suction port 24 and supply it to the injection nozzle 13.

Further, the collection rotating disk 21 is rotated at a set number of revolutions, and an arbitrary set amount of abrasive is supplied to the collection rotating disk 21.
Can be suctioned from the suction port 24 of the abrasive supply pipe 14 facing the circumferential surface of the nozzle and supplied to the injection nozzle 13.

Further, vibration is applied to the polishing material amount adjusting tank 12 to maintain the collection amount of the polishing material by the circumferential surface of the collection turntable 21 at a set amount.

In the abrasive supply apparatus 10 of the present invention,
An abrasive amount adjusting tank 12 communicating with a lower portion of the abrasive material tank 11 is provided. The abrasive amount adjusting tank 12 communicates with an injection nozzle 13 communicating with a compressed air supply source through an abrasive supply pipe 14, and In a blast processing apparatus for sucking abrasive from the abrasive amount adjusting tank 12 by a negative pressure in the abrasive supply pipe 14 generated by injecting compressed air from a compressed air supply source from the injection nozzle 13 and supplying the abrasive to the injection nozzle 13, In the polishing material amount adjusting tank 12, for example, a collection rotating disk 21 having a collecting portion formed of a concave portion (22) formed on a circumferential surface is rotatably provided by a rotation driving means, and the collection rotating disk is provided. At least a part of the circumferential surface of the abrasive material 21 is buried in the abrasive material flowing into the abrasive amount adjusting tank 12, and the abrasive material supply direction of the abrasive material supply pipe 14 is provided on the circumferential surface of the collection rotating disk 21. Rear end In which close the write port 24.

In another abrasive supply apparatus 10 of the present invention, an introduction pipe 16 communicating with a lower part of the abrasive tank 11 is provided.
Is passed through the abrasive amount adjusting tank 12 to form an abrasive layer 17 made of abrasive flowing into a lower portion of the abrasive amount adjusting tank 12 and an air layer 18 on the upper portion of the abrasive layer 17. For example, a collecting turntable 21 having a collecting portion formed of a concave portion formed on the circumferential surface is formed by burying or enlarging a part of the circumferential surface of the collecting turntable 21 in the abrasive layer 17 and the air layer 18, respectively. The suction port 24 at the rear end of the abrasive supply pipe 14 in the abrasive supply direction is located close to the circumferential surface of the collection turntable 21 facing the air layer 18.

The collecting portion may be formed of a large number of concave marks having a rectangular shape or a circular shape.

Further, the collecting portion may be formed by forming a plurality of endless grooves continuous in the circumferential direction in parallel with the circumferential surface width direction.

Further, by adjusting the rotation speed of the collection rotary disk 21, the abrasive in the abrasive amount adjusting tank 12 is supplied to the set amount spray nozzle 13.

In addition, the provision of the rotation speed of the supplementary rotating disk 21 so as to be adjustable can be achieved by changing the rotating speed of the collection rotating disk 21 to increase or decrease the number of revolutions, thereby reducing the amount of abrasive supplied to the injection nozzle 13. This is desirable because it can be easily set to a desired amount.

Further, the suction port 2 of the abrasive supply pipe 14
It is desirable to provide 4 so that the width direction of the collection rotary plate 21 can be covered so that the abrasive can be efficiently collected. Further, the suction port 24 of the abrasive supply pipe 14 is rotated by the collection rotation. It is desirable to form the plate 21 slenderly in the width direction in order to efficiently suck all the abrasives on the circumferential surface of the collection rotary plate 21 provided wide.

The provision of vibration generating means such as a vibrator 28 for vibrating the abrasive amount adjusting tank 12 allows the abrasive to sufficiently penetrate into the concave portion of the circumferential surface of the collection turntable 21 so that the collection rotation is performed. This is desirable in that the amount of the abrasive collected by the disk 21 is fixed.

Further, it is desirable to provide a scraper that is close to or in contact with the circumferential surface of the collecting rotary disk 21 in order to make the amount of abrasives collected on the circumference of the collecting rotary disk 21 constant.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method and an apparatus for supplying an abrasive according to the present invention will be described below with reference to the drawings.

A blasting machine in which the abrasive supply device 10 of the present invention is installed has an injection nozzle 13 for injecting an abrasive to the workpiece and a cabinet for charging the workpiece, and an injection nozzle from the injection nozzle 13. An abrasive tank 11 that collects and stores reusable abrasives by separating dust from the abrasives is communicated via a pipe, and the air flow of a blower, a blower, a compressor, etc. An air flow is generated from the cabinet to the abrasive tank 11 by communicating with the generating means, and the abrasive or dust is placed on the air flow and transported. The abrasive tank 11 itself may be a so-called cyclone, or may be a tank that communicates with the lower part of the cyclone and simply stores the abrasive of the cyclone.

An abrasive amount adjusting tank 12 is communicated with a lower part of the abrasive tank 11 so that the abrasive in the abrasive tank 11 flows into the abrasive amount adjusting tank 12. An abrasive layer 17 is formed by the flowing abrasive, and an air layer 18 is formed on the abrasive layer 17.

A supplementary rotating disk 21 which rotates at a constant speed by the rotational force of a rotary driving means such as a motor is provided with a part of the circumference buried in the abrasive layer 17 in the abrasive amount adjusting tank 12, and A part of the circumferential surface of the collection turntable 21 is exposed to the air layer 18. In addition, by adjusting the rotation speed of the collection rotating disk 21, the amount of the abrasive supplied to the injection nozzle 13 can be easily increased or decreased to adjust to a desired set amount. Collection turntable 21
Forms a collecting portion for collecting the abrasive on the circumferential surface of the collecting rotating disk 21. For example, the collecting portion may be a concave portion having a V-shaped, square, or U-shaped cross section, and the arrangement of the concave portion is formed by forming a series of endless grooves continuous in the circumferential direction of the collecting turntable 21 on the circumferential surface. A plurality may be formed in parallel with the width direction. Alternatively, the recess may be a groove that is long in the width direction of the collection turntable 21 and a plurality of the grooves may be formed in parallel with the circumferential direction of the collection turntable 21. For example, a plurality of plate-shaped blades that are long in the circumferential surface width direction of the collection rotary disk 21 may be provided in parallel with the circumferential surface circumferential direction at appropriate intervals.

When the width of the grooves is several times larger than the particle size of the abrasive, it is preferable to close both ends of each groove in order to prevent the abrasive from dropping from both ends of the grooves. In the case where the groove width is a small interval slightly larger than the particle size of the abrasive, the abrasive does not easily fall from both ends of the groove, so that both ends of the groove need not be closed. Further, the collecting portion may be formed with a groove which obliquely intersects the circumferential direction and the width direction of the collecting rotary disk 21 on the circumferential surface of the collecting rotary disk 21. Further, the collecting portion may be formed by forming a large number of concave marks having a flat rectangular shape or a circular shape on the circumferential surface of the collecting rotating disk 21. In addition, it is desirable that the concave portions are regularly arranged in order to quantitatively collect the abrasive. As the concave portion, various shapes can be listed as described above, but in any case, the concave portion may be any shape as long as the abrasive can be placed or fitted so that the abrasive can be collected. The shape is not limited to this.

In this embodiment, as shown in FIG. 2, the collecting rotary disk 21 is about one-third of the width of the abrasive material adjusting tank 21.
Although the width is made as small as possible, it is better to form the abrasive as wide as possible within a range where the abrasive can be sucked by the suction force of the suction port 24, so that the area of the circumferential surface becomes larger, so that more abrasive can be efficiently collected. It is desirable because it can be done.

Further, by connecting vibration generating means such as a vibrator 28 to the abrasive amount adjusting tank 12, the amount of the abrasive collected on the circumferential surface of the collection turntable 21 is kept constant. This is desirable. That is, by vibrating the abrasive amount adjusting tank 12 by the vibration generating means,
Since the abrasive sufficiently enters into the concave portion of the circumferential surface of the collection rotating disk 21, the amount of the abrasive to be collected is constant. In addition, since the collection rotating plate 21 also vibrates, excess abrasive other than the abrasive entering the recess is shaken off, so that the amount of abrasive collected can be maintained uniformly.

By making the side edge of a plate-shaped or rod-shaped scraper made of metal, resin, or the like approach or come into contact with the circumferential surface of the collecting turntable 21, a concave portion of the circumferential surface of the collection turntable 21 is formed. It is desirable in that the abrasives other than a certain amount among the abrasives collected in the step are scraped off by the side edges of the scraper to make the amount of the abrasives collected on the circumferential surface of the collection rotating disk 21 constant. . In addition, by bringing the edge of the suction port 24 close to the circumferential surface of the collection turntable 21 at a constant interval, the suction port 2
4 can be used as a scraper.

Abrasive supply pipe 1 communicating with the injection nozzle 13.
The suction port 24 at the rear end of No. 4 in the abrasive supply direction is provided at a position close to the circumferential surface of the collection turntable 21 exposed to the air layer 18.

When compressed air is supplied from the compressed air supply source to the injection nozzle 13 to generate a negative pressure in the abrasive supply pipe 14, a collection portion on the circumferential surface of the collection turntable 21 which rotates at a constant speed. Is collected from the suction port 24 and supplied to the injection nozzle 13 through the abrasive supply pipe 14, and a constant amount of the abrasive is injected from the injection nozzle 13 to the workpiece.

In the above-described embodiment, the upper portion of the collection rotating disk 21 is provided with the air layer 18 in the abrasive amount adjusting tank 12.
However, in the present invention, even when the entire collection turntable 21 is submerged in the abrasive layer 17, or the inside of the abrasive amount adjustment tank 12 is filled with the abrasive. This is applicable even when the air layer 18 is not formed in the so-called abrasive material amount adjusting tank 12. In this case, bringing the edge of the suction port 24 of the abrasive supply pipe 14 into contact with or as close as possible to the circumferential surface of the collection turntable 21 is performed by collecting the concavity in the circumferential surface of the collection turntable 21. This is desirable in that only the abrasive that has been removed is sucked through the suction port 24. In other words, if the gap between the suction port 24 and the circumferential surface of the collection turntable 21 is large, the rate at which the abrasive material around the suction port 24 is sucked from the gap increases, so that the suction amount of the polishing material, This is because there are many factors that make the material supply amount unstable.

[0040]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the above-described embodiment of the method and apparatus for supplying an abrasive according to the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 70 denotes a recovery tank, which is a so-called cyclone, which is an apparatus for separating dust from abrasives. At the bottom of the collection tank 70, a reusable abrasive 15 after dust is separated is stored. An abrasive tank 11 is connected to the bottom of the collection tank 70, and the abrasive tank 1
The abrasive 15 in the collection tank 70 falls into the storage tank 1 and is stored.

Reference numeral 12 denotes an abrasive amount adjusting tank, which is a closed tank having a substantially rectangular parallelepiped shape. The introduction pipe 16 communicating with the bottom surface of the polishing material tank 11 is inserted from the upper wall surface of the polishing material amount adjusting tank 12 into the inside, and the introduction port 1 at the tip of the introduction pipe 16 is introduced.
The surface 9 is provided at a position about two-thirds in the height direction from the bottom surface of the abrasive amount adjusting tank 12. Therefore, the abrasive 15 in the abrasive tank 11 falls through the introduction pipe 16 into the lower abrasive amount adjusting tank 12 and flows into the lower part of the abrasive amount adjusting tank 12, and the abrasive layer made of the abrasive flows into the lower part of the abrasive amount adjusting tank 12. 1
7 is formed below the inlet 19, and an air layer 18 is formed above the abrasive layer 17. When the abrasive 15 in the abrasive tank 11 flows into the abrasive amount adjusting tank 12, the upper surface of the abrasive layer 17 rises and stops at the height of the inlet 19 of the inlet pipe 16. That is, when the upper surface of the abrasive layer 17 rises to the inlet 19, the abrasive 15 in the abrasive tank 11 does not flow into the abrasive amount adjusting tank 12. Therefore, the air layer 18 is always formed in the upper part in the height direction in the abrasive amount adjusting tank 12 at about one third, and about two thirds in the lower part.
The abrasive layer 17 is formed.

Reference numeral 21 denotes a collecting rotary disk, and in this embodiment, as shown in FIG. 2, a groove portion formed of a series of V-shaped endless grooves continuous in the circumferential direction on the circumferential surface of the collecting rotary disk 21. A plurality of 22 are formed parallel to the circumferential surface width direction. The supplementary rotating disk 21 is rotatably supported by a rotating shaft 25 in the abrasive layer 17 in the abrasive amount adjusting tank 12 in a vertical direction, and the rotating shaft 25 is located below the upper surface of the abrasive layer 17. The upper portion or a part of the upper portion of the collection turntable 21 is provided at a position exposed to the air layer 18. In addition, the upper part of the collection turntable 21 refers to a range of a portion located above a horizontal line passing through the center of the rotation axis of the collection turntable 21. Therefore, in the present embodiment, the entire lower half of the circumference of the collection rotary disk 21 is reliably immersed in the abrasive layer 17, and a part of the upper half of the circumference of the collection rotary disk 21 is 18 is exposed. Therefore, when the collection rotating disk 21 rotates, a part of the upper half of the circumference of the collection rotating disk 21 is submerged in the abrasive layer 17, so that the abrasive is
2 and the abrasive of the abrasive layer 17 is reliably transferred to the air layer 18.

The rotating shaft 25 is provided with the abrasive amount adjusting tank 12.
A pulley 26 is provided at the shaft end of the rotating shaft 25, and is connected to the pulley 26 via a V-belt which transmits rotational force to a rotation driving means such as a motor (not shown). The rotation speed of the rotation driving means can be easily adjusted by a known means.

Numeral 23 denotes a suction pipe, which is connected to the rear end of the abrasive supply pipe 14 communicating with the spray nozzle 13 in the abrasive supply direction, and the rear end face of the suction pipe 23 is a circumferential surface of the collection rotary disc 21. An elongated suction port 24 is formed to have a length substantially equal to the width of the opening, and is formed so as to become narrower forward from the suction port 24 in the abrasive supply direction. As shown in FIG. 2, the suction port 24 has a funnel shape, and the entire length in the longitudinal direction of the suction port 24 is provided so as to cover the entire width of the collection turntable 21 so as to be covered. Is close to the circumferential surface.

When the collection rotary disc 21 is rotated clockwise on the paper surface of FIG. 2 at a constant speed by the rotary drive means, the abrasive material that has entered the groove 22 on the circumferential surface of the collection rotary disc 21 and has been collected. The abrasive in layer 17 is transferred to air layer 18. When compressed air is supplied to the injection nozzle 13 from the compressed air supply source,
Negative pressure is generated in the abrasive supply pipe 14 and the suction pipe 23, and the abrasive in the groove 22 of the rotating collection turntable 21 is sucked from the suction port 24 at the vertex of the collection turntable 21, and is polished. It is supplied to the injection nozzle 13 through the material supply pipe 14. The collection rotating disk 21 is rotated at a constant speed, and the amount of abrasive collected on the circumferential surface of the collection rotation disk 21 is constant. Therefore, the amount of the abrasive is suctioned from the suction port 24 and supplied to the injection nozzle 13. The amount of abrasive is quantified. In addition, the edge of the suction port 24 functions as a scraper as described above, and a certain amount of abrasive is scraped off from the circumferential surface of the collection rotary disc 21 so that the amount of abrasive can be more reliably determined. To contribute.

Further, a vibrator 28 is connected to the bottom surface of the polishing material amount adjusting tank 12.
By giving vibration to the abrasive amount adjusting tank 12 with
Since the abrasive material sufficiently enters the groove 22 on the circumferential surface of the collection rotating disk 21, and the collection rotation disk 21 also vibrates, the abrasive other than the abrasive material that has entered the groove 22 is shaken off. The amount of abrasive collected on the circumferential surface of the collection rotating disk 21 is always constant, and a constant amount of abrasive is collected in a more stable state. Therefore, the injection nozzle 13
The amount of the abrasive supplied to the nozzle is reliably maintained at a constant amount.

The number of revolutions can be increased or decreased by adjusting the rotation speed of the collection rotary disc 21, and the amount of abrasive supplied to the injection nozzle 13 can be adjusted. For example, by increasing the rotation speed of the collection rotating disk 21, a large amount of abrasive is supplied, and by reducing the rotation speed of the collection rotation disk 21, a small amount of abrasive is supplied. In addition, the collection turntable 21
In any case, the rotation speed is maintained constant, so that a constant amount of abrasive is supplied to the spray nozzle 13 in a constantly stable state, and a fixed amount of abrasive is processed from the spray nozzle 13 through the spray nozzle 13. Injected into things. Therefore, since the rotation speed of the supplementary rotating disk 21 and the abrasive supply amount are correlated, this relational expression is obtained and the abrasive supply amount is determined by the supplementary rotating disk 2.
Digitization at a rotation speed of 1 makes it possible to easily adjust the desired amount of abrasive supplied.

The above-mentioned abrasive supply device 10 is mounted on the above-described pneumatic direct-pressure blasting device 60 as shown in FIGS.

When the abrasive is sprayed from the spray nozzle 13 to the workpiece in the cabinet 61 and the workpiece is blasted, the abrasive becomes a reusable abrasive or a damaged non-reusable abrasive. The dust and the like generated by the removal of the abrasive and the workpiece are both supplied to the collection tank 70 via the conduit 65 in the airflow. The non-reusable abrasive and the dust are separated from the reusable abrasive in the collection tank 70, and the non-reusable abrasive and the dust are fed to a dust collector (not shown). And clean air is discharged to the outside air from a dust collector exhaust fan. On the other hand, the reusable abrasive is stored at the bottom of the recovery tank 70 and then dropped into the abrasive tank 11,
The above operation is repeated.

[0051]

Since the present invention is configured as described above, it has the following effects.

(1) Conventionally, since the abrasive was supplied from the abrasive tank through a small introduction hole to the abrasive amount adjusting tank, it was easy for troubles due to foreign matters to occur. Since there is no need to reduce the inner diameter of the introduction pipe communicating between the quantity adjustment tanks, troubles due to foreign matter do not occur.

(2) Conventionally, the amount of the abrasive falling from the abrasive tank into the abrasive amount adjusting tank was not stable. However, the present invention rotates the collection rotary disk in the abrasive amount adjusting tank. Then, the abrasive in the abrasive amount adjusting tank is quantitatively collected on the circumferential surface of the collecting rotary disk, and the collected abrasive is sucked from the suction port of the abrasive supply pipe. A fixed amount of abrasive was reliably supplied from the tank to the injection nozzle in a stable state.

(3) In the present invention, it is possible to increase or decrease the supply amount of the abrasive by changing the rotation speed of the collection rotating disk to increase or decrease the rotation speed. The abrasive can be supplied in a constant amount in a stable state. Therefore, by freely adjusting the rotation speed of the supplementary rotating disk, it is possible to reliably and easily adjust the supply amount of the abrasive according to the type of the abrasive. In addition, by digitizing the rotation speed of the supplementary rotating disk corresponding to the abrasive supply amount, the desired abrasive supply amount, and therefore the injection amount, can be easily set.

(4) In the present invention, even if the abrasive has a fine powder property, the inside diameter of the introduction pipe that connects the abrasive tank and the abrasive amount adjusting tank is set to be the same because of the reason (1) above. Since it can be formed into a large size, it does not have the trouble of not falling in a fixed amount as in the past, and because of the reason in (2) above, the circumferential surface of the collecting rotary disk can be used even for abrasives showing fine powder properties. It was possible to collect the polishing material in a fixed amount in the collecting part of (1), and to reliably supply a fixed amount of the polishing material to the injection nozzle.

[Brief description of drawings]

FIG. 1 is a front view showing a cross section of a main part of an abrasive supply device according to an embodiment of the present invention, and a schematic explanatory view showing a flow of an abrasive.

FIG. 2 is a side view showing a cross section of a main part in an abrasive amount adjusting tank according to the embodiment of the present invention.

FIG. 3 is a perspective view showing the inside of an abrasive amount adjusting tank according to the embodiment of the present invention.

FIG. 4 is a front view showing a gravity type blast processing device.

FIG. 5 is a side view showing a gravity type blasting device.

FIG. 6 is a cross-sectional view of a main part of a conventional abrasive supply device, particularly showing a state of the abrasive when an abrasive not exhibiting fine powder properties falls into a suction pipe.

FIG. 7 is a cross-sectional view of a main part of a conventional abrasive supply device, particularly showing a state of the abrasive when the abrasive having a fine powder property falls into a suction pipe.

FIG. 8 is a cross-sectional view of a main part of a conventional abrasive supply device, and particularly shows a state of the abrasive when an abrasive exhibiting fine powder properties falls into a suction pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Abrasive supply apparatus 11 Abrasive tank 12 Abrasive amount adjustment tank 13 Injection nozzle 14 Abrasive supply pipe 15 Abrasive 16 Inlet pipe 17 Abrasive layer 18 Air layer 19 Inlet 21 Collection turntable 22 Groove (recess) 23 Suction pipe 24 Suction port 25 Rotary shaft 26 Pulley 27 Bearing 28 Vibrator (vibration generating means) 40 Abrasive material supply device 42 Suction pipe 43 Inlet hole 44 Cavity 60 Blasting device 61 Cabinet 62 Tube 63 Input port 65 Duct 66 Dust collector 67 Discharge Pipe 68 Hopper 69 Air blower 70 Recovery tank 73 Inflow port 74 Connecting pipe 75 Communication pipe

Claims (13)

[Claims] An abrasive in an abrasive tank flows into an abrasive amount adjusting tank, and the abrasive in the abrasive amount adjusting tank is sucked through an abrasive supply pipe, and the sucked abrasive is polished. In a blasting process in which a workpiece is supplied to an injection nozzle through a material supply pipe and is injected from the injection nozzle to a workpiece, at least a part of the circumference is buried in the abrasive flowing into the abrasive amount adjusting tank. The rotating disk is rotated in the abrasive amount adjusting tank, the abrasive is collected on the circumferential surface of the supplementary rotating disk, and the abrasive is suctioned from the suction port of the abrasive supply pipe facing the circumferential surface. And supplying the abrasive to a spray nozzle. 2. The abrasive in the abrasive tank flows into the abrasive amount adjusting tank, the abrasive in the abrasive amount adjusting tank is sucked through an abrasive supply pipe, and the sucked abrasive is polished. In a blasting process in which the material is supplied to a spray nozzle through a material supply pipe and sprayed from the spray nozzle to a workpiece, an abrasive layer formed of an abrasive flowing into a lower portion in the abrasive amount adjusting tank; A part of the circumference of the collection rotary disk is buried or faced in the air layer above the material layer and rotated, and the suction port of the abrasive supply pipe facing the circumferential surface of the collection rotary disk in the air layer. Abrasive supply method in blast processing, wherein an abrasive is sucked from a nozzle and supplied to an injection nozzle. 3. An abrasive material is collected by a collecting part formed on a circumferential surface of a collecting rotary disk in the abrasive amount adjusting tank, and the collected abrasive is sucked into an abrasive material supply pipe inlet. The abrasive supply method in blast processing according to claim 1 or 2, wherein the abrasive is supplied to the injection nozzle by suction from the nozzle. 4. The collection rotating disk is rotated at a set number of revolutions, and an arbitrary set amount of abrasive is sucked from a suction port of an abrasive supply pipe facing a circumferential surface of the collection rotation disk and supplied to an injection nozzle. The method for supplying an abrasive in blasting according to claim 1. 5. The abrasive supply method in blast processing according to claim 1, wherein vibration is applied to the abrasive amount adjustment tank. 6. An abrasive amount adjusting tank communicating with a lower portion of the abrasive tank, and the abrasive amount adjusting tank is communicated with an injection nozzle communicating with a compressed air supply source via an abrasive supply pipe. In a blast processing apparatus for sucking abrasive from an abrasive amount adjusting tank and supplying the abrasive to an injection nozzle by a negative pressure in an abrasive supply pipe generated by injecting compressed air from a compressed air supply source from an injection nozzle, the abrasive amount adjustment In the tank, a collection rotating disk having a collection part formed on a circumferential surface is rotatably provided by a rotation driving means, and
At least a portion of the circumferential surface of the collection turntable is buried in the abrasive flowing into the abrasive amount adjusting tank, and the abrasive supply of the abrasive supply pipe is provided on the circumferential surface of the collection turntable. An abrasive supply device for blasting, characterized in that a suction port at a rear end in a direction is close to the suction port. 7. An abrasive amount adjusting tank communicating with a lower portion of the abrasive tank, the abrasive amount adjusting tank being connected to an injection nozzle communicating with a compressed air supply source via an abrasive supply pipe, and In a blast processing apparatus for sucking abrasive from an abrasive amount adjusting tank by a negative pressure in an abrasive supply pipe generated by injecting compressed air of a compressed air supply source from an injection nozzle and supplying the abrasive to an injection nozzle, An introduction pipe communicating with a lower portion is inserted into the abrasive amount adjusting tank to form an abrasive layer made of the abrasive flowing into the lower portion of the abrasive amount adjusting tank and an air layer above the abrasive layer. Along with the abrasive wheel and the air layer, a collecting rotary disk having a collecting portion formed on a circumferential surface is provided rotatably by burying or facing a part of the circumferential surface of the collecting rotary disk, The circle of the collection wheel facing the air layer Abrasive supplying apparatus in blasting, characterized in that adjacent the inlet of the abrasive material supply direction rear end of the abrasive material supply pipe to the surface. 8. The abrasive material supply device for blasting according to claim 6, wherein said collection portion is formed by forming a series of endless grooves continuous in the circumferential direction in parallel with the circumferential surface width direction. . 9. The abrasive material supply device in blast processing according to claim 6, wherein said collection portion comprises a large number of concave marks having a plane rectangular shape or a circular shape. 10. The abrasive material supply device in blast processing according to claim 6, wherein a rotation speed of the collection rotating disk is provided so as to be adjustable. 11. A suction port of the abrasive material supply pipe is provided so as to cover the circumferential surface width direction of the collection rotary plate so as to be covered.
An abrasive supply device in blast processing according to any one of claims 10 to 10. 12. The abrasive supply apparatus in blast processing according to claim 6, further comprising vibration generation means for vibrating the abrasive amount adjustment tank. 13. The abrasive material supply device in blast processing according to claim 6, further comprising a scraper which comes close to or in contact with the circumferential surface of said collection rotary disk.