JP7215482B2 - Cyclone classifier discharge mechanism, cyclone classifier and polishing system - Google Patents

Description

The present invention relates to a discharge mechanism for discharging powder from a cyclone classifier, a cyclone classifier and a polishing system.

Conventionally, cyclone classifiers have been used in a wide range of fields such as blast processing equipment and pulverization systems. For example, a blasting apparatus sprays an abrasive (abrasive particles) onto a workpiece to perform polishing, and sucks and collects powder containing the abrasive used for the polishing. The collected abrasives are recycled and used, but the collected powder includes not only reusable abrasives but also dust such as cutting dust from the workpiece and worn abrasives that cannot be reused. is The cyclone classifier generates a whirling airflow inside the cyclone body to classify the abrasives and dust, and supplies the reusable abrasives to a hopper provided at the bottom of the cyclone body.

Here, when the hopper and the cyclone main body are in communication with each other, an air current is generated from the hopper toward the cyclone main body. If this air current causes the abrasive stored in the hopper to flow back into the cyclone main body, there is a risk that the classification accuracy will decrease.

Patent Document 1 discloses a technique for preventing the abrasive from flowing back into the cyclone main body by providing an electromagnetic valve that cuts off the communication between the cyclone main body and the abrasive tank on the path from the cyclone main body to the abrasive tank. disclosed.

JP-A-2009-762

If a known powder valve such as a butterfly valve is used as the electromagnetic valve of Patent Document 1, a mechanism for opening and closing the powder valve is required, which complicates the device. As a result, the size of the device increases and the maintainability decreases. In addition, since the powder valve is a precision part, the powder valve may wear out due to the passage of the powder and may fail.

Therefore, there is a demand for a discharge mechanism, a cyclone classifier, and a polishing system that have a simple configuration and high maintainability.

In one aspect, a discharge mechanism is provided in a cyclone classifier that classifies powder and discharges powder stored in a reservoir of the cyclone classifier. The discharge mechanism includes an opening/closing member for opening and closing a discharge port formed in the reservoir, and an injector for injecting compressed gas in pulses to the powder stored in the reservoir. The opening/closing member is configured to receive the pressing force of the compressed gas and open the discharge port when the compressed gas is injected from the injector. When the compressed gas is not injected from the injector, the negative pressure of the reservoir closes the discharge port by urging it toward the reservoir.

In the discharge mechanism according to the above aspect, the discharge port is closed by the opening/closing member when the compressed gas is not being injected from the injector, and the discharge port is opened by the pressing force of the compressed gas when the compressed gas is being injected from the injector. be. Thus, by controlling the opening and closing of the discharge port by the pressure of the compressed gas, the powder can be discharged from the cyclone classifier with a simple structure without using a precision device such as an electromagnetic valve. Therefore, the maintainability of the discharge mechanism of the cyclone classifier can be improved.

In one embodiment, a limiting member that limits the amount of displacement of the opening/closing member with respect to the discharge port to a predetermined range may be further provided so that the opening/closing member can close the discharge port due to the negative pressure of the reservoir.

If the amount of displacement of the opening/closing member with respect to the discharge port becomes excessive, the opening/closing member cannot be moved toward the discharge port due to the negative pressure in the reservoir, and the discharge port cannot be closed properly. In the above-described embodiment, the amount of displacement of the opening/closing member is limited by the limiting member, so that it is possible to prevent the outlet from becoming unable to be closed.

In one embodiment, the injector may be positioned such that the powder does not scatter when the compressed gas is injected onto the powder.

In the above-described embodiment, since the powder does not float inside the cyclone body due to the injection of the compressed gas, it is possible to suppress the deterioration of the classification accuracy.

In one embodiment, the cyclone classifier includes a cylindrical cyclone body that generates a swirling airflow inside thereof, the reservoir is provided at the bottom of the cyclone body, and the injector is arranged along the central axis of the cyclone body. It may have an injection tube that extends and injects compressed gas from its end.

In the above-described embodiment, since the extending direction of the injection pipe coincides with the center of the whirling airflow, the whirling airflow in the cyclone main body is less likely to be disturbed, and a decrease in classification accuracy can be suppressed.

In one embodiment, a sealing member may be further provided which is attached to the storage portion and contacts the opening/closing member to seal the space in the storage portion when the opening/closing member closes the outlet.

By providing such a sealing member, communication between the inside of the reservoir and the inside of the hopper can be blocked more reliably.

A cyclone classifier according to one aspect includes the discharge mechanism described above.

According to the cyclone classifier according to the above embodiment, it is possible to maintain high classification accuracy while discharging powder using a discharge mechanism having high maintainability.

In one embodiment, the discharge port may be formed on the inclined surface of the reservoir so that the width of the opening becomes narrower toward the bottom.

According to the above-described embodiment, by forming the discharge port so that the width of the opening becomes narrower toward the bottom, the negative pressure generated in the cyclone main body can be efficiently applied to the opening/closing member.

In one aspect, there is provided a polishing system including the above-described cyclone classifier and a polishing mechanism that performs polishing by colliding or rubbing an abrasive against a workpiece. The abrasive processing system separates reusable abrasives from powder containing abrasives that have been impacted or rubbed against a workpiece.

According to the polishing system according to the above aspect, it is possible to efficiently collect reusable abrasives using the cyclone classifier. In addition, since the discharge mechanism of the cyclone classifier has a simple structure, the polishing system can be made compact and maintainability can be improved.

In one embodiment, the dust collector further comprises a dust filter and a dust filter recovery member. The dust collection filter recovery member is formed in a cylindrical shape having openings at both ends, and when the dust collection filter is attached to the dust collector, the dust collection filter recovery member is folded into a bellows shape. Moreover, when removing the dust filter from the dust collector, the dust filter may be detached from the dust collector in a state in which the dust filter is wrapped with the openings at both ends closed.

According to the above embodiment, the dust collection filter can be recovered and replaced without releasing the dust captured by the dust collection filter to the outside.

ADVANTAGE OF THE INVENTION According to one aspect and various embodiments of the present invention, it is possible to provide a discharge mechanism, a cyclone classifier, and a polishing system having a simple configuration and high maintainability.

1 is a diagram schematically showing the configuration of a polishing system; FIG. It is an explanatory view showing the configuration of a discharge mechanism for a cyclone classifier. FIG. 2(A) is an explanatory plan view of the cyclone classifier as seen from the abrasive outlet side, and FIG. 2(B) is an explanatory sectional view and a partially enlarged view. It is explanatory drawing which shows operation|movement of the discharge mechanism for cyclone-type classifiers. FIG. 4 is an explanatory view showing the configuration of the dust collection filter recovery member and the dust collection filter recovery method;

Hereinafter, a discharge mechanism for a cyclone classifier, a cyclone classifier, and a polishing system according to one embodiment will be described with reference to the drawings.

As shown in FIG. 1, the polishing system S includes an abrasive supply mechanism 1, a polishing mechanism 2, a suction pipe 3, a dust collector 4, and a discharge mechanism 5 for a cyclone classifier (hereinafter referred to as "discharge mechanism 5"). I have.

In this embodiment, the polishing mechanism 2 will be described as a polishing device, and the cyclone classifier 10 will be described as a separating means of the polishing device. The polishing mechanism 2 polishes the workpiece W by colliding or scraping it with the abrasive material G, and sucks and collects the powder containing the abrasive material G used for the polishing process. The recovered powder includes not only the reusable abrasive G, but also cutting powder generated from the workpiece W and dust containing abrasive that cannot be reused due to wear during grinding. The cyclone classifier 10 has a function of separating and removing dust from the collected powder and taking out the reusable abrasive G.

As shown in FIGS. 1 and 2, the abrasive supply mechanism 1 includes a cyclone classifier 10, a hopper 12 and a constant supply device 13. As shown in FIG.

The cyclone classifier 10 is a device for sorting out reusable abrasives G from abrasives G used for processing and powder containing dust generated during processing.

The cyclone classifier 10 includes a cyclone main body 11, a charging section 10a for charging the abrasive G and dust into the cyclone main body 11, and a suction section 10b.

The cyclone main body 11 has a straight body portion 11a, a reduced diameter portion 11b and a storage portion 11c. The straight body portion 11a has a substantially cylindrical shape with the central axis AX as its central axis, and has a substantially constant diameter in the central axis AX direction. The reduced diameter portion 11b is continuously provided downward from the straight body portion 11a. The reduced-diameter portion 11b has a substantially cylindrical shape whose central axis is the central axis AX and whose diameter decreases downward. The storage portion 11c has a cylindrical shape and is provided continuously below the diameter-reduced portion 11b. This storage part 11c stores the reusable abrasive material G that has been collected.

The storage portion 11c has an inclined surface 11e that is inclined downward toward the center axis AX of the cyclone body 11. As shown in FIG. A discharge port 11d for discharging the abrasive G to the hopper 12 is formed in the inclined surface 11e.

In one embodiment, the discharge port 11d may have a shape in which the width of the opening decreases toward the bottom in order to efficiently apply the negative pressure. For example, the discharge port 11d may have a trapezoidal shape with a shorter side at the lower end in a plan view with respect to an inclined surface 11e described later (see FIG. 2A).

The input part 10a is provided on the upper part of the cyclone main body 11, more specifically on the side surface of the straight body part 11a. One end of the suction tube 3 is connected to the input portion 10a.
The charging part 10 a receives the powder including the abrasive G and the dust from the stirring mechanism 20 described later and charges the powder into the cyclone main body 11 .

The suction portion 10b is provided at the upper end portion of the cyclone body 11. As shown in FIG. The suction part 10b is connected to the dust collector 4 via the dust collection pipe 4a. The suction part 10 b generates an upward airflow that revolves around the central axis AX inside the cyclone body 11 by the suction force of the dust collector 4 .

When the powder is introduced into the cyclone main body 11 from the charging port 10a, the abrasive material G and the dust are classified by the rising air current swirling inside the cyclone main body 11. As shown in FIG. Dust, which is relatively light among powders, is sent to the dust collector 4 through the dust collection pipe 4a. Among the dust particles, the reusable abrasive G having a large particle size and heavy weight falls due to gravity and is stored in the storage portion 11c.

The dimensions of the cyclone main body 11 are appropriately designed according to the type and amount of the abrasive G to be introduced, the air volume of the dust collector 4 described later, the classification point, and the like. In this embodiment, a case where the cyclone main body 11 having the following configuration is used will be described.

・Straight body part 11a: inner diameter 186 mm, height 302 mm
・Reduced diameter portion 11b: upper inner diameter 186 mm, lower inner diameter 100 mm, height 280 mm
・Exhaust port 11d: upper side 90 mm, lower side 80 mm, height 40 mm

The hopper 12 is a container for temporarily storing the reusable abrasive G sorted by the cyclone classifier 10 and is provided below the cyclone main body 11 . As shown in FIG. 1, the storage portion 11c of the cyclone main body 11 is arranged inside the hopper 12, and the hopper 12 and the storage portion 11c communicate with each other through a discharge port 11d formed in the storage portion 11c. .

The constant supply device 13 is a device that receives the abrasive G from the hopper 12 and supplies a fixed amount of the abrasive G to the polishing mechanism 2 (stirring mechanism 20). The constant supply device 13 is arranged below the hopper 12 . As the constant supply device 13, a device having a known configuration can be appropriately selected and employed. A configuration in which the material G is sent to the stirring mechanism 20 by a constant amount can be adopted.

The constant supply device 13 is provided above the stirring mechanism 20 and supplies the abrasive G so that the abrasive G from the hopper 12 falls toward the workpiece W in the stirring mechanism 20 .

The polishing mechanism 2 is a device that polishes the workpiece W by colliding or scraping the workpiece W with the abrasive material G. As shown in FIG. The polishing mechanism 2 of this embodiment includes a stirring mechanism 20 .

The stirring mechanism 20 is a device for fluidizing and stirring a plurality of workpieces W, and includes a processing container 21 that accommodates the plurality of workpieces W and a rotating means 22 that rotates the processing container 21. I have.

The processing container 21 has a wall surface 21a and a mounting platen 21b. The wall surface 21a has a cylindrical shape. The mounting platen 21b has a disk shape and is provided so as to cover the bottom of the wall surface 21a. The processing container 21 is supported by the rotating means 22 with the mounting plate 21b inclined.

The mounting plate 21b has a mesh or lattice shape, and its openings (mesh or lattice) are formed to a size that allows the abrasive G to pass through but prevents the workpiece W from passing therethrough. Such a processing container 21 allows the polishing material G to pass through and allows the workpiece W to remain on the mounting plate 21b.

The rotating means 22 rotates the processing container 21 about the center of the mounting plate 21b while the processing container 21 is inclined at a predetermined angle with respect to the horizontal plane. As the rotating means 22, a known driving device comprising a motor, a rotation transmission member, and the like can be employed.

The rotating means 22 rotates the processing container 21 in an inclined state, thereby fluidizing and stirring the workpiece W within the processing container 21 .

The other end of the suction tube 3 is arranged below the processing container 21 . More specifically, the other end of the suction tube 3 is arranged below the workpiece W flowing on the mounting plate 21b of the processing container 21 so as to provide a gap with respect to the mounting plate 21b. there is The suction pipe 3 is a duct for sucking the polishing material G that has passed through the processing container 21 . As described above, one end of the suction tube 3 is connected to the input section 10a of the cyclone classifier 10. As shown in FIG.

The suction pipe 3 sucks the area where the workpiece W exists from the back side of the mounting plate 21 b of the processing container 21 by the negative pressure of the cyclone body 11 , so that the polishing material G is transferred to the mounting plate of the processing container 21 . 21 b , that is, from the constant supply device 13 to the suction tube 3 .

Abrasive G discharged from the constant supply device 13 falls toward the processing container 21 . The dropped abrasive is accelerated by the airflow generated by the operation of the suction tube 3 . Then, the abrasive G collides with or rubs against the workpiece W to polish the workpiece W. As shown in FIG. The abrasive G and dust that have passed through the processing container 21 after polishing the workpiece W are sucked into the suction pipe 3 and transported to the cyclone body 11 .

The dust collector 4 includes a dust removal section 40 , a cleaning section 41 , a dust collection filter 42 , and a dust collection filter recovery member 43 . The dust removal section 40 is a box having an opening 40b formed at the top, and communicates with the suction section 10b of the cyclone classifier 10 via the dust collection tube 4a. Cleaning section 41 is supported on dust removing section 40 so as to close opening 40 b of dust removing section 40 . In one embodiment, a hinge is provided between the dust removal section 40 and the cleaning section 41, and as shown in FIG. You may be connected so that opening and closing is possible.

The dust collection filter 42 is held by the cleaning section 41 while being inserted into the dust removal section 40 through the opening 40b. The dust collection filter recovery member 43 is provided so as to surround the dust collection filter 42 in the cleaning section 41 . The dust collecting filter collecting member 43 is used for housing and collecting the dust collecting filter 42 so as not to scatter dust when the dust collecting filter 42 is replaced. It is formed in a shape (cylindrical shape). One of the openings is provided with an attachment/detachment means (for example, an elastic band) (not shown) that covers the dust collection filter 42 attached to the dust collector 4 and is attachable/detachable to the dust collector 4 . In the attached state, the dust collection filter recovery member 43 is folded in a bellows shape.

The dust collector 4 sucks dust classified by the cyclone classifier 10 . Among the sucked dust, powder having a relatively large particle size is stored in a discharge section 40a provided at the bottom of the dust removal section 40 and discharged downward from the bottom of the dust collector 4. FIG. Dust with a small particle size is captured by the dust collection filter 42 . The clean airflow from which dust has been removed is sent to the cleaning section 41 and then released to the outside.

Next, the discharge mechanism 5 of one embodiment will be described in detail. The discharge mechanism 5 is provided in the storage portion 11 c to discharge the abrasive G in the storage portion 11 c toward the hopper 12 . As shown in FIGS. 2 and 3, the ejection mechanism 5 includes an opening/closing member 50, a restricting member 51 and an injector 52. As shown in FIGS.

The opening/closing member 50 is for opening/closing the discharge port 11d formed in the storage portion 11c, and has an opening/closing plate 50a and a support member 50b. The opening/closing plate 50a is provided along the outer surface of the inclined surface 11e so as to cover the discharge port 11d.

The opening/closing plate 50a of the opening/closing member 50 opens/closes the discharge port 11d by displacing the position of the lower end thereof based on the pressure difference between the inside and the outside of the storage portion 11c. As will be described later, when the compressed gas is injected from the injector 52, the opening/closing plate 50a receives the pressing force of the compressed gas and opens the discharge port 11d so that the compressed gas is not injected from the injector 52. In some cases, the negative pressure of the reservoir 11c pushes the reservoir 11c toward the reservoir 11c to close the discharge port 11d. By operating in this manner, the opening/closing member 50 can switch between a state in which the reservoir 11c and the hopper 12 are in communication and a state in which the communication between the reservoir 11c and the hopper 12 is blocked.

As shown in FIG. 2B, in one embodiment, the opening/closing plate 50a includes a main opening/closing plate 50c made of low-hardness resin and a backup member 50d made of high-hardness resin. The main opening/closing plate 50c is provided on the side of the discharge port 11d, and the backup member 50d is provided on the rear side (the surface away from the discharge port 11d) of the main opening/closing plate 50c. The main opening/closing plate 50c is made of, for example, a wear-resistant urethane plate having a durometer hardness of A15° (JIS K6253:2012), and the backup member 50d is made of, for example, MC nylon (registered trademark). By forming the main opening/closing plate 50c from elastic, low-hardness resin, it is possible to improve the adhesion between the main opening/closing plate 50c and the outlet 11d. In addition, by forming the backup member 50d from a high-hardness resin, it is possible to prevent the main opening/closing plate 50c from being greatly deformed and to prevent the deterioration of the airtightness. Thereby, the discharge port 11d can be closed more reliably.

The shape of the backup member 50d is not limited to a plate shape as long as it can prevent the main opening/closing plate 50c from being greatly deformed. As a material of the main opening/closing plate 50c, for example, a rubber plate (durometer hardness A70°) may be used. Further, as the material of the backup member 50d, an ultra-high molecular weight polyethylene plate (polyethylene with a molecular weight raised to 1,000,000 to 7,000,000) may be used.

The support member 50b is attached to the outer surface of the storage portion 11c, and fixes the upper portion of the opening/closing plate 50a to the inclined surface 11e. In one embodiment, the support member 50b fixes only the main opening/closing plate 50c to the inclined surface 11e, and the backup member 50d is not fixed by the support member 50b. As a result, the rigidity of the support member 50b can be reduced, so that the discharge port 11d can be easily opened and closed.

The support member 50b may include a biasing member such as a leaf spring to support the opening/closing plate 50a so as to be swingable around the support member 50b, and to bias the opening/closing plate 50a toward the discharge port 11d. . When the support member 50b has such a biasing member, the opening/closing plate 50a need not be made of an elastic member, and may be made of a lightweight metal plate or the like.

Further, in order to improve the airtightness of the storage portion 11c, the discharge mechanism 5 contacts the opening/closing member 50 to seal the space in the storage portion 11c when the opening/closing member 50 closes the discharge port 11d. A member 50e may also be provided. The sealing member 50e has an annular shape and is provided between the inclined surface 11e of the reservoir 11c and the opening/closing plate 50a. The sealing member 50e comes into contact with the opening/closing plate 50a when the discharge port 11d is closed, and hermetically seals the reservoir 11c. In the embodiment shown in FIG. 2B, the sealing member 50e is formed as an annular projecting member (width 2 mm, height 1 mm) extending to cover the edge of the discharge port 11d. The sealing member 50e may be made of an elastic material such as silicon rubber, and may be provided on the side of the opening/closing plate 50a.

Further, the restriction member 51 is provided on the back side of the opening/closing plate 50a (the side opposite to the discharge port 11d). The limiting member 51 limits the amount of displacement of the opening/closing member 50 with respect to the discharge port 11d to a predetermined range so that the opening/closing member 50 can close the discharge port 11d by the negative pressure of the reservoir 11c. In this embodiment, the restricting member 51 has a plate shape and is attached to the outer surface of the cyclone body 11 .

After the lower end of the opening/closing plate 50a is displaced outward to open the discharge port 11d, the restricting member 51 is arranged so that the discharge port 11d is returned to the closed state by the negative pressure of the cyclone body 11. limit the amount of displacement of More specifically, when the displacement angle θ of the opening/closing plate 50a with respect to the outlet 11d is 3 to 20°, or when the gap d between the opening/closing plate 50a and the inclined surface 11e is 2.0°. It is provided outside the opening/closing plate 50a so as to come into contact with the opening/closing plate 50a and restrict a larger displacement of the opening/closing member 50 when the width is 5 to 20 mm. For example, the restricting member 51 may be configured to contact the opening/closing plate 50a when the displacement angle θ of the opening/closing member 50 is 5° or when the gap d is 4.5 mm. The restricting member 51 may not be provided, for example, when the inclination of the inclined surface 11e is small and the opening/closing plate 50a can return to the state of closing the outlet 11d by the negative pressure of the cyclone body 11.

The injector 52 comprises an injection tube 52a connected to a source of compressed gas such as a compressor. The injection pipe 52a extends downward along the central axis AX (the center of the swirling airflow) of the cyclone body 11 so as not to disturb the swirling airflow inside the cyclone body 11 .

The injector 52 injects compressed gas in pulses (intermittently) from above the abrasive material G stored in the reservoir 11c of the cyclone body 11 to the abrasive material G through the injection pipe 52a. downwards. The injection of the compressed gas is appropriately set according to the supply amount of the abrasive G. For example, when the supply amount of the abrasive material G is 180 g/min, the injector 52 injects compressed gas with a pulse interval of 1/10 seconds and a pulse pressure of 0.2 MPa. When the abrasive material G is pressed downward by this compressed gas, the opening/closing plate 50a is elastically deformed, and the lower end of the opening/closing plate 50a rotates about the supporting member 50b. A gap occurs. As a result, the discharge port 11d is opened, and the reusable abrasive G is supplied from the reservoir 11c to the hopper 12 through the gap between the opening/closing plate 50a and the discharge port 11d.

At this time, when the compressed gas from the injector 52 is locally injected to a portion of the upper portion of the abrasive material G in the storage part 11c, the abrasive material G will rise up. The height at which the injector 52 is arranged so that the compressed gas presses a wide area, preferably the entire top of the abrasive material G to prevent the abrasive material G from being blown up, The expansion of the compressed gas and the like can be appropriately set. As a result, it is possible to prevent the classification accuracy of the reusable abrasives G from deteriorating due to the injection of the compressed gas. For example, the injector 52 may include an injection pipe 52a with a diameter of 8 mm, and the distance from the opening of the injection pipe 52a to the lower end of the discharge port 11d may be 266 mm.

When the injection of the compressed gas is completed, the opening/closing plate 50a is urged toward the reservoir 11c by the negative pressure generated in the cyclone body 11 and the elasticity of the opening/closing plate 50a to close the discharge port 11d. As a result, communication between the hopper 12 and the cyclone main body 11 is cut off.

As a result, the abrasive G in the hopper 12 is blown up by the air current in the cyclone classifier 10 and the differential pressure (for example, -several kPa) between the hopper 12 and the cyclone main body 11 and flows back to the cyclone main body 11 side. You can prevent being sucked.

Next, referring to FIGS. 1 and 3, the polishing method by the polishing system S will be described, focusing on the operation of the discharge mechanism 5. FIG.

First, the abrasive material G necessary for processing is put into the hopper 12 . At this time, since no negative pressure is generated in the cyclone body 11, the opening/closing plate 50a is separated from the discharge port 11d, and the discharge port 11d is opened (FIG. 3(A)).

Next, the workpiece W is put into the processing container 21, and the workpiece W is mounted on the mounting board 21b.

Then, the dust collector 4 is started. When the dust collector 4 operates, suction is performed from the suction pipe 3 through the cyclone classifier 10, and an air current is generated from the constant supply device 13 side to the other end of the suction pipe 3 in the vicinity of the mounting plate 21b. At this time, the pressure in the cyclone main body 11 is reduced, and as shown in FIG. 3B, the opening/closing plate 50a is urged toward the storage portion 11c to close the discharge port 11d. That is, communication between the hopper 12 and the cyclone body 11 is cut off.

Subsequently, the stirring mechanism 20 is activated, and the processing container 21 is rotated by the rotating means 22 . Thereby, the workpiece W in the processing container 21 flows and is agitated.

Subsequently, the constant supply device 13 is operated to supply a constant amount of the abrasive G into the processing container 21 .

The abrasive G supplied from the constant supply device 13 into the processing container 21 falls toward the workpiece W which is flowing on the air current. At this time, the workpiece W is polished by rubbing the abrasive material G and the workpiece W against each other.

Abrasive material G and powder containing dust generated by polishing pass through the mounting plate 21 b by air flow, and are supplied to the cyclone classifier 10 through the suction pipe 3 . This powder is classified into reusable abrasive G and dust by the cyclone classifier 10, and the dust is sent to the dust collector 4 via the suction part 10b. On the other hand, the reusable abrasive G drops into the reservoir 11 c of the cyclone body 11 .

As shown in FIG. 3(C), when a certain amount of reusable abrasive material G is collected in the reservoir 11c, the abrasive material G is sent to the hopper 12 to be used again for polishing.

The abrasive material G is supplied from the reservoir 11 c to the hopper 12 by opening the discharge port 11 d by the opening/closing member 50 of the discharge mechanism 5 . In one embodiment, the abrasive material G may be supplied to the hopper 12 by opening and closing the discharge port 11d at time intervals set according to the polishing conditions.

As shown in FIG. 3(D), the discharge mechanism 5 applies the compressed gas from the injector 52 to the abrasive material G in the reservoir 11c in a pulse form, for example, at intervals of 0.1 to 0.2 seconds. Spray intermittently. The abrasive material G is pressed downward by the compressed gas, whereby the opening/closing plate 50a rotates and displaces downward, creating a gap between the opening/closing plate 50a and the discharge port 11d. The reusable abrasive G is supplied from the reservoir 11c to the hopper 12 through this gap.

When the injection of the compressed gas is completed, the opening/closing plate 50a is urged toward the storage portion 11c by the negative pressure inside the cyclone body 11 and the elasticity of the opening/closing plate 50a, thereby closing the discharge port 11d (see FIG. 3B). situation). As a result, the supply of the abrasive G from the cyclone main body 11 to the hopper 12 is stopped.

By closing the discharge port 11d with the opening/closing plate 50a, the abrasive G in the hopper 12 is stirred up by the air current in the cyclone classifier 10 and the differential pressure between the hopper 12 and the cyclone main body 11. Since backflow to the cyclone main body 11 side can be prevented, the abrasive G can be discharged from the cyclone classifier 10 while maintaining high classification accuracy.

Through the steps described above, the workpiece W can be polished. After the polishing is completed, the operation of each part is stopped, and the polished workpiece W is recovered.

As described above, in the discharge mechanism 5, when the compressed gas is injected from the injector 52, the discharge port 11d is opened by the pressure of the compressed gas, and when the injection of the compressed gas is stopped, the hopper 12 and the reservoir 11c are opened. The discharge port 11d is closed due to the pressure difference between . Therefore, according to such a discharge mechanism 5, it is possible to control the supply of the abrasive G with a simple structure without using a complicated device such as an electromagnetic valve or a powder valve. Therefore, it is possible to reduce failures of the cyclone classifier 10 and improve maintainability.

When the polishing system S is stopped and the dust filter 42 of the dust collector 4 is replaced, the dust filter 42 is stored in the dust filter recovery member 43 and recovered. When removing the dust filter 42 from the dust collector 4, first, the cleaning section 41 is opened as shown in FIGS. 4(A) and 4(B). Next, as shown in FIG. 4C, the dust collection filter recovery member 43 is pulled out in the removal direction (upward in this embodiment), and the upper opening is tied. Subsequently, as shown in FIG. 4(D), the dust collecting filter 42 is taken out from the dust collector 4 with the dust collecting filter 42 wrapped. Then, as shown in FIG. 4E , the dust filter 42 is housed in the dust filter recovery member 43 by binding the opening on the lower end side of the dust filter recovery member 43 . Subsequently, as shown in FIG. 4F, the dust collection filter recovery member 43 is removed from the dust collector 4 and recovered. By using the dust collection filter recovery member 43 in this manner, the dust collection filter 42 can be recovered without releasing the dust captured by the dust collection filter 42 to the outside. After that, a new dust filter 42 is attached to the dust collector 4, and the dust filter recovery member 43 is arranged at a predetermined position.

In the polishing system S, when the abrasive G freely falls from the constant supply device 13 toward the processing container 21 of the stirring mechanism 20 , it is accelerated toward the suction tube 3 and the entire amount is sucked from the suction tube 3 . Therefore, it is possible to prevent the abrasive G supplied from the constant supply device 13 to the stirring mechanism 20 from scattering around. In addition, by collecting the dust collected by the dust collector 4 using the dust collection filter collecting member 43, it is possible to prevent the dust adhering to the dust collection filter 42 from scattering around. Therefore, according to this polishing system S, it is possible to perform polishing while suppressing the discharge of the abrasive G and dust to the surroundings.

The discharge mechanism, the cyclone classifier, and the grinding system according to various embodiments have been described above. is.

For example, in the above embodiment, the cyclone type classifier 10 classifies the powder containing the abrasive G used in the polishing mechanism 2, but it is used in other processing devices such as an air blast device and a centrifugal blast device. It may be used for classification of powder containing the abrasive G that has been polished. In addition, the cyclone classifier 10 can be used for classifying various powders, such as classifying pulverized materials and granulated materials, and classifying dust generated in factories and the like.

In the above embodiment, the discharge port 11d is formed on the inclined surface 11e of the storage portion 11c, but the discharge port 11d may be formed at a position different from the inclined surface 11e, for example, at the bottom of the storage portion 11c. . Moreover, the shape of the discharge port 11d is not limited to a trapezoid, and various shapes such as a rectangle and a circle can be adopted. Moreover, when the side surface of the storage part 11c includes an inclined surface and a vertical surface, it is possible to form the discharge port 11d on the vertical surface.

Furthermore, the pulse mechanism for backwashing provided in the dust collector 4 may be branched and used as the injector 52 of the discharge mechanism 5 .

(Effect of Embodiment)
According to the discharge mechanism 5 of the above embodiment, when the compressed gas is injected from the injector 52, the discharge port 11d is opened by the pressure of the compressed gas, and when the injection of the compressed gas is stopped, the hopper 12 and the reservoir The outlet 11d is closed due to the pressure difference with 11c. As a result, it is possible to prevent the abrasive G from flowing back from the hopper 12 to the cyclone main body 11, so that the powder is removed from the cyclone classifier 10 while maintaining high classification accuracy of the reusable abrasive G. can be discharged.

The cyclone classifier 10 having the discharge mechanism 5 can be a cyclone classifier with high accuracy in classifying the abrasive G. As shown in FIG. Further, the polishing system S including the cyclone classifier 10 can be constructed as a polishing system with high classification accuracy of the abrasive material G. FIG.

(Example)
The classification accuracy of the cyclone classifier 10 was confirmed by the examples below.

In this embodiment, the workpiece W is not used, and the polishing system S is operated under the condition that the particle size distribution does not change from the constant supply device 13 to the cyclone classifier 10, and the size of the reusable size is obtained. Confirm that the particles are well classified without being transferred to the dust collector 4 side.

The apparatus configuration was the same as that of the embodiment. The test conditions are as follows.
・Abrasive: WA#1000 (manufactured by Sintokogyo Co., Ltd.)
・Amount of supply: 100g/min
・Operating time: 10 minutes ・Injection interval of pulse air (pressure gas): 10 seconds

Evaluation was performed by the collection rate. The collection rate is the ratio of the powder collected by the dust collector 4, and was derived from the formula shown below based on the total supply amount and the amount collected by the dust collector 4. The smaller the collection rate C, the better the classification of reusable particles without being transferred to the dust collector.

Table 1 shows the collection rate when the amount of powder supplied is changed.

From the results shown in Table 1, it was confirmed that the collection rate in the dust collector 4 was 3% or less, and particles of reusable size were not transferred to the dust collector 4 side more than necessary. Therefore, it was confirmed that the powder was successfully classified by the cyclone classifier 10 .

2 Polishing mechanism (stirring mechanism 20) 4 Dust collector 5 Discharge mechanism 10 Cyclone classifier 11c Reservoir 11d Discharge port 11e Inclined surface 42 Dust collection filter 43 Dust collection filter recovery member 50 Opening/closing member 50e Sealing member 51 Limiting member 52 Injector 52a Injection pipe AX Central axis (center of whirling airflow) G Polishing material S Polishing Machining system, W... work piece.

Claims (8)

A discharge mechanism provided in a cyclone classifier for classifying powder and discharging powder stored in a storage unit of the cyclone classifier,
an opening/closing member for opening/closing an outlet formed in the reservoir;
an injector for injecting compressed gas in a pulsed manner to the powder stored in the storage unit;
The opening/closing member is
when the compressed gas is injected from the injector, the discharge port is opened by receiving the pressing force of the compressed gas;
When the compressed gas is not injected from the injector, it is configured to be biased toward the reservoir side by the negative pressure of the reservoir to close the discharge port ,
The cyclone classifier includes a cylindrical cyclone body that generates a swirling airflow inside thereof, and the reservoir is provided at the bottom of the cyclone body,
The ejection mechanism , wherein the injector has an injection tube that extends along the central axis of the cyclone body and injects the compressed gas from an end thereof . 2. The discharge according to claim 1, further comprising a limiting member for limiting the amount of displacement of said opening/closing member with respect to said discharge port to a predetermined range so that said opening/closing member can close said discharge port due to the negative pressure of said reservoir. mechanism. 3. The discharge mechanism according to claim 1, wherein the injector is arranged at a position where the powder does not scatter when the compressed gas is injected onto the powder. 4. The storage device according to any one of claims 1 to 3 , further comprising a sealing member attached to said storage portion, which abuts against said opening/closing member to seal a space within said storage portion when said opening/closing member closes said discharge port. The ejection mechanism according to item 1. A cyclone classifier comprising the discharge mechanism according to any one of claims 1 to 4 . 6. The cyclone classifier according to claim 5 , wherein the discharge port is formed on the inclined surface of the reservoir so that the width of the opening becomes narrower toward the bottom. A polishing system comprising the cyclone classifier according to claim 5 or 6 and a polishing mechanism for polishing a workpiece using an abrasive,
The polishing system, wherein the cyclone classifier classifies reusable abrasives from powder containing the abrasives used for polishing the workpiece. Equipped with a dust collector,
The dust collector includes a dust filter and a dust filter recovery member,
The dust collection filter recovery member is formed in a tubular shape having openings at both ends,
When the dust filter is attached to the dust collector, the dust filter recovery member is folded in a bellows shape and arranged,
8. When the dust filter is removed from the dust collector, the dust filter can be removed from the dust collector with the openings at both ends closed and the dust filter wrapped. The polishing system according to .

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