JP3588284B2 - Grinding equipment - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an improvement in a grinding device that injects abrasive grains using centrifugal force of an impeller.
[0002]
[Prior art]
As a prior art related to the present invention, there is an invention of Japanese Patent Application No. 11-138416. This prior invention uses an impeller as an abrasive particle injection device, and eliminates waste of abrasive particles by supplying the injected abrasive particles to the injection device again by a feeder. In addition, since the work is placed in a closed working chamber and abrasive grains are sprayed, the scattering of abrasive dust is prevented, and the working environment is improved.
[0003]
[Problems to be solved by the invention]
However, the prior invention described above still has the following problems. First, it has been difficult to diffuse all the abrasive grains supplied to the injection device to the peripheral surface side of the impeller where the centrifugal force is highest. That is, in the above-mentioned prior invention, abrasive grains are dropped and supplied to an impeller from a hopper or the like. In the case of the configuration, the blades are inclined leftward and downward on the supply side (the right half of the impeller) of the abrasive grains, so that the dropped abrasive grains are bounded in the center direction by the inclined blades. There was a problem that movement to the surface side was hindered and a part of the abrasive grains could not be diffused to the peripheral surface of the impeller. In addition, if the number of blades is decreased and the interval is increased, or if the diameter of the impeller is increased, this problem can be solved, but another problem that the abrasive grains cannot be continuously injected due to the increase in the blade interval occurs. .
[0004]
Secondly, from the viewpoint of reusing the abrasive grains, the prior application invention supplies the ejected abrasive grains to the ejecting device again by the feeder, but the configuration is complicated because the feeder is adopted as a separate body. There was a problem that it affected the product cost. In particular, since the object to be transported is abrasive grains, it is necessary to periodically replace the feeder due to the polishing action.
[0005]
The present invention has been made in order to solve the above-mentioned conventional problems, and an object of the present invention is to provide a grinding device capable of efficiently ejecting abrasive grains by diffusing the abrasive grains to the peripheral surface side of the impeller. That is. It is another object of the present invention to disclose a configuration in which abrasive grains can be resupplied to an impeller without employing another means such as a feeder.
[0006]
[Means for Solving the Problems]
In order to achieve the above-described object, in the present invention, a work chamber that can be hermetically closed, a hopper connected to a lower part thereof, and a supply of abrasive grains from the hopper via a dropping cylinder, and the abrasive grains are It consists of an injection device that sprays into the inside of the working chamber, and the injection device is formed by winding a belt around an impeller that holds a plurality of blades between two disks so as to open a part of the peripheral surface. On the other disk of the impeller, means for providing a plurality of resilient plates extending from the fixing member of the drive shaft toward the outer periphery so as to be rotatable together with the impeller is used.
[0007]
According to this means, the abrasive grains are ejected upward from the ejection device toward the working chamber, and the ejected abrasive grains are supplied again to the ejection device via the hopper and the drop cylinder. Further, the repelling plate rotates together with the impeller, and has a function of diffusing the abrasive grains to the peripheral surface side of the impeller by repelling the abrasive grains at an edge thereof.
[0008]
According to the second aspect of the present invention, the repelling plate has a configuration in which the front and back sides are stacked in the thickness direction, and a means having higher hardness than the back side is used for the front side. According to this means, the edge of the repelling plate as a whole is prevented from being rounded due to abrasion, and the diffusion action is maintained for a long time. Further, in the invention according to the third aspect, in view of the fact that the front side flipping plate having high hardness has little wear, a means of making the front side flipping plate thinner than the back side is used.
[0009]
According to the fourth aspect of the present invention, the repelling plate uses means for projecting the side surface on the front side from the back side. According to this means, the edge protrudes as a whole of the flip plate, and the edge (the front side of the flip plate) can be held for a longer period.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is an overall view of an apparatus showing an embodiment of the present invention. In the drawing, reference numeral 1 denotes a sealable work chamber for performing a work of grinding a workpiece, 2 denotes an injection device for injecting abrasive grains toward the work chamber 1, and 3 denotes an injection nozzle provided from the injection device 2 toward the work chamber 1. It is. The lower part of the working chamber 1 is a hopper 1 a, which is provided with a lid 1 b which can be opened and closed appropriately at the opening thereof, so as to supply abrasive grains to the injection device 2 via the dropping cylinder 4. According to this configuration, the abrasive particles sprayed from the injection device 2 toward the work chamber 1 collide with the work, and are again supplied from the discharge cylinder 4 to the injection device 2 via the hopper 1a, and waste of the abrasive particles is reduced. Lost.
[0011]
The injection device 2 mainly includes an impeller 2a, an endless belt 2b wound around the impeller 2a, and three pulleys 2c arranged so as to wind the belt 2b with a part of the impeller 2a opened. 2c. As shown in FIGS. 2 and 3, the impeller 2a sandwiches a plurality of blades 22... 22 inclined forward in the rotation direction between two disks 20 and 21. The peripheral surface between them is open. In the impeller 2a, the disk 20 on the front side has a donut shape having an inlet 20a, and the drop cylinder 4 faces the inside of the impeller 2a through the inlet 20a. On the other hand, a drive shaft 23 is provided on the rear disk 21. By connecting the drive shaft 23 to a motor or the like, a rotational force is applied to the impeller 2a.
[0012]
Further, on the rear disk 21, two repelling plates 25, 25 extending from the fixing member 24 of the drive shaft 23 toward the outer periphery are provided, and this configuration is one of the features of the present invention. Here, it is a matter of course that the repelling plates 25 are provided so as not to interfere with the blades 22 and the drop cylinder 4. In FIG. 3, reference numeral 26 denotes an anti-scattering plate provided on the front side of the impeller 2a, and a brush 26a provided on the peripheral surface of the anti-scattering plate 26 prevents the abrasive grains thrown into the impeller 2a from scattering to the outside. Is what you do.
[0013]
FIG. 4 shows a use form of the injection device 2. The abrasive grains injected into the impeller 2 a from the drop cylinder 4 are gradually diffused to the outer peripheral surface of the impeller 2 a by the wind pressure and centrifugal force of the blade 22. Then, the belt 2b rolls on the belt 2b to be offset to an acute angle portion formed by the blades 22 and the belt 2b, and the tangential direction starting from the point at which the belt 2b separates from the impeller 2a (in the present embodiment, an oblique direction). Top) is injected.
[0014]
Here, the repelling plate 25 has a function of diffusing the abrasive grains supplied from the drop cylinder 4 to the outer peripheral surface of the impeller 2a. That is, when the dropping cylinder 4 is installed on the right side of the impeller 2a as in the present embodiment, the abrasive grains dropped from the dropping cylinder 4 are dropped from the dropping cylinder 4 directly below by free fall, and the flip plate 25 If not, the abrasive grains bounce on the blades 22 and some of them do not diffuse to the outer peripheral surface of the impeller 2a. This prevents uniform ejection of the abrasive grains. However, according to the present embodiment, the abrasive grains dropped from the drop cylinder 4 are blown off by the edge of the rotating flip plate 25 and can be diffused to the outer peripheral surface of the impeller 2a.
[0015]
In addition, as shown in FIG. 5, the repelling plate 25 is scraped off by the polishing action of the abrasive grains so that the edge becomes round with time. When the edge is scraped off in this way, the direction in which the abrasive grains are flipped off changes, so that the above-described diffusion effect of the flipping plate 25 is reduced. For this reason, the repelling plate 25 is preferably made of a material having a high hardness, such as ceramics. However, even if the material is changed, the above disadvantages cannot be completely solved.
[0016]
Therefore, in the modification shown in FIG. 6, two flip plates 25 are stacked in the thickness direction, and the edge side, that is, the front side 25a, is made of a material having higher hardness than the back side 25b. With this configuration, even if the rear side 25b is worn away so as to be cut off, the front side 25a is hardly worn out, and the edge remains as a whole of the flip plate 25. Therefore, the diffusion effect is maintained for a long time. can do.
[0017]
FIG. 7 shows a further modified example, in which the side face of the front side 25a is made to protrude more than the back side 25b while two flip plates 25 are stacked. In this way, the edge of the entire repelling plate 25 can be left for a longer period of time.
[0018]
In the above embodiment, two flip plates 25 are used point-symmetrically, but the number is not limited to this. For example, four flip plates 25 may be arranged at 90 degrees. However, there is an experimental result that if the number of blades is four or more depending on the rotation speed of the impeller (flap), the diffusion effect of the abrasive grains is reduced. However, the number of the flaps 25 is determined by comprehensively considering the size of the impeller 2a, the rotation speed, and the interval between the blades 22, and if the conditions are satisfied, the number of the flaps 25 is five or more. It is also possible.
[0019]
On the other hand, the number of blades 22 is preferably as large as possible. This is because the abrasive grains can be continuously and evenly sprayed without unevenness.
[0020]
Further, the abrasive grains can be selected depending on the purpose of grinding and the object to be ground. For example, silicon carbide or alumina can be used if the object to be ground is metal, diamond powder can be used if ceramic, and alumina or iron oxide can be used if plastic. Further, by changing the abrasive grains, intermediate polishing, finishing and the like can be freely adjusted, and shot blasting is also possible.
[0021]
【The invention's effect】
As described above, according to the present invention, since the repelling plate extending in the radial direction is provided at the center of the impeller, the abrasive grains can be efficiently diffused to the outer peripheral surface of the impeller, and continuous injection without unevenness of the abrasive grains can be achieved. Contribute. In addition, since the working chamber is provided above the spraying device and the abrasive is resupplied from the working chamber to the spraying device, reuse of the abrasives and downsizing of the device can be achieved at the same time. Further, in the second and third aspects, the striking plate has a structure of two sheets stacked, and a high hardness is adopted on the edge side, so that the abrasion of the striking plate by abrasive grains is delayed, and the diffusion action is maintained for a longer time. Can be.
[Brief description of the drawings]
FIG. 1 is an overall view of a grinding device showing an embodiment of the present invention. FIG. 2 is a partially cutaway perspective view of an impeller. FIG. 3 is a sectional view of an impeller. FIG. FIG. 5 is an enlarged view of a main part of a flip plate. FIG. 6 is a perspective view showing a modification of the flip plate. FIG. 7 is a perspective view showing a further modification of the flip plate.
DESCRIPTION OF SYMBOLS 1 Working room 1a Hopper 2 Injection device 2a Impeller 2b Belt 2c Pulley 3 Injection nozzle 4 Drop cylinder 20/21 Disk 20a Input port 22 Blade 23 Drive shaft 24 Fixed member 25 Playing plate

Claims (4)

A work chamber capable of being sealed, a hopper connected to a lower part of the work chamber, and an injection device that receives supply of abrasive grains from the hopper via a dropping cylinder, and injects the abrasive grains into the inside of the work chamber. The injection device is configured such that a belt is wound around an impeller that holds a plurality of blades between two disks so as to open a part of the peripheral surface, and the other disk of the impeller is driven. A grinding device comprising a plurality of resilient plates extending from a shaft fixing member toward an outer periphery thereof so as to be rotatable together with the impeller . 2. The grinding device according to claim 1, wherein the striking plate has a configuration in which two sheets are stacked in the thickness direction, and the front side has higher hardness than the rear side. The grinding device according to claim 2, wherein the flip plate has a thinner front surface than a rear surface. The grinding device according to claim 2 or 3, wherein the repelling plate has a front side surface protruding from a back side.

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