JP2717703B2 - Impact plate for jet crusher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a jet in which an object to be crushed is mixed with a jet jet to flow, and the object is crushed by colliding the object with a collision plate. The present invention relates to a collision plate used in a crusher.

(Prior Art) Hereinafter, a jet pulverizer used in a device for producing a dry powder such as a toner used in a copying machine as a conventional technology will be described. It is not limited to a jet pulverizer.

First, a dry powder manufacturing apparatus to which the present invention is applied will be described with reference to FIG.

A raw material 1 which has been coarsely crushed in advance is supplied to a supply device 3 via a hopper 2. The raw material 1 supplied to the feeder 3 is introduced from the feeder 3 to the coarse powder cut classifier 4 by pneumatic transportation. The coarse powder cut classifier 4 is a cyclone type classifier, and a jet crusher 5 is provided below the coarse powder cut classifier 4. A circulation path 6 passes between the outlet 5A of the jet crusher 5 and the inlet 4A of the coarse powder cut classifier 4.
To crush the coarse powder while circulating the powder between the coarse powder cut classifier 4 and the jet crusher 5. The coarse powder cut classifier 4 drops coarse powder in the circulating object to the jet crusher 5 at the same time as taking out powder having a predetermined particle size range from the outlet 4B. Is to be classified and removed. The ultrafine powder that has been classified and removed is air-conveyed to the back filter 8 via the pipe 7. The powder having a predetermined particle size range from which the ultrafine powder and the coarse powder have been removed is again subjected to a classifier 9 for cutting the ultrafine powder, whereby the remaining ultrafine powder is further cut. The powder from which the residual ultrafine powder has been cut is pneumatically transported to a fine powder cut classifier 11 via a feeder 10. This fine powder cut classifier 11 cuts powder having a particle size equal to or less than a predetermined particle size in the powder and further removes ultrafine powder,
The powder leaving the fine powder cut classifier 11 is the product powder 12 having a particle size within a predetermined range.

As shown in FIG. 2, the jet crusher 5 to which the present invention is applied includes a storage hopper 13, a bridge breaker 14, an air vibrator 15, a supersonic crushing nozzle 16, a collision plate 17, and an adjusting device 18.

The storage hopper 13 is for storing the raw material to be pulverized, and the bridge breaker 14 is for destroying the raw material that has caused a bridging phenomenon at the suction port 19 of the supersonic pulverizing nozzle 16, and the air vibrator 15 is for storing the raw material. When the raw material adheres to the inner surface of the hopper 13, the storage hopper 13 is vibrated to remove the adhered matter. The supersonic crushing nozzle 16 accelerates the compressed air supplied by the main valve 20, and sucks and mixes the raw material into the accelerated air from the suction port 19. The impingement plate 17 is disposed in front of the supersonic pulverizing nozzle 16 to impinge the supersonic flowing air mixed with the raw material.
By moving forward and backward, the crushing effect can be changed. The outer shape of the collision plate 17 is not limited to a circle, but various shapes such as a square and an ellipse are adopted.

The conventional collision plate 17 uses ceramic or cermet as its material.

(Problems to be Solved by the Invention) As described above, the hitherto known collision plate 17 uses very hard ceramic or cermet as a material, but the peripheral edge thereof is particularly worn due to severe collision of the raw material. That is, the peripheral edge of the collision plate 17 is sharpened at a right angle, and when the raw material collides with this sharp portion, a drop occurs there.
Then, the chipping and wear gradually increase from the missing part. If the peripheral edge of the impingement plate 17 is missing or worn, the pulverizing effect will be different.
Had to be replaced.

In addition, there are various types of powders such as toner, and if the type is frequently changed in the manufacturing process, the collision plate is removed each time. It was often done.

Further, the collision plate 17 is conventionally fixed to the tip of the adjusting device 18 with an adhesive, but it takes time to cure the adhesive, so that the crusher cannot be operated immediately after the bonding operation.

SUMMARY OF THE INVENTION An object of the present invention is to provide a collision plate that reduces the frequency of replacement due to wear of the collision plate and facilitates attachment to an adjusting device.

(Means for Solving the Problems) The feature of the present invention resides in that a metal frame is provided on the peripheral edge of the collision plate on the collision surface side.

(Embodiment) Hereinafter, a collision plate according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 3 shows a collision plate according to an embodiment of the present invention, in which a collision plate 32 made of ceramic or cermet is fitted and fixed to a concave metal frame 31. As the metal material used for the metal frame of the present invention, various metals having abrasion resistance, such as stainless steel, high hardness, and general structural steel materials, and having appropriate workability and hardness are used. Peripheral part 31A of metal frame 31
Has a structure that completely covers the periphery of the collision plate 32 on the side of the collision surface 32A, so that a sharp portion of the periphery on the side of the collision surface 32A is not exposed. On the bottom 31B of the metal frame 31, a set screw 33 is provided. The set screw 33 fixes the metal frame 31 to an adjusting device (not shown). As a fixing means of the metal frame 31, a screw hole may be formed in the bottom portion 31B of the metal frame 31 instead of the set screw 33, and a set screw may be provided on the side of the adjusting device. It is also possible to adopt a structure in which another locking means is provided between the control means and the adjusting means. Here, as the shape of the collision plate 32, various shapes such as a circle, a square, and an ellipse are adopted. Further, the metal frame 31 may be fixed to the collision plate 32 by an adhesive, or may be a so-called shrink fit in which the metal frame 31 is heated and expanded to fit the collision plate 32, or a so-called shrink fit. When is circular, a screw thread (screw groove) may be formed around it and screwed into a screw groove (screw thread) formed in the stainless steel frame 31.

According to the structure of the collision plate according to the present invention configured as described above, the peripheral edge of the collision plate 32 is not sharp, so that the raw material does not drop due to collision. Also, collision plate 32
Since the metal frame 31 wears before the periphery of the metal frame 31 wears, it is only necessary to replace the metal frame 31 at a relatively low price. Therefore, it is not necessary to replace the expensive collision plate 32, and the operation cost is reduced.

FIG. 4 shows another embodiment of the present invention. In this embodiment, the metal frame 31 has a cylindrical shape such as a cylindrical shape, a rectangular cylindrical shape, an elliptical cylindrical shape, and the like. It has a structure without a bottom part compared to. This embodiment can also prevent the peripheral edge of the collision plate 32 from being chipped or worn.

Note that the metal frame does not necessarily need to cover the entire periphery of the collision plate, and it is sufficient that the metal frame covers at least the peripheral edge on the front side of the collision plate.

In the above description, a toner crusher of a copying machine has been described as a crusher to which the collision plate of the present invention is applied.
The impact plate of the present invention is applicable to jet crushers in general.

(Effects of the Invention) As described above, according to the present invention, there is no loss or wear of the peripheral portion of the conventional collision plate, and the durability of the collision plate is improved, and at the same time, the fluctuation of the crushing effect of the crusher is reduced. .

Further, since the metal frame is provided, the fixing to the adjusting device is simplified.

[Brief description of the drawings]

FIG. 1 is a system diagram showing a known dry powder production apparatus, and FIG.
FIG. 3 is a cross-sectional view showing an example of a jet pulverizer used in the dry powder manufacturing apparatus, FIG. 3 is a cross-sectional view of an impingement plate showing one embodiment of the present invention, and FIG. It is sectional drawing which shows Example of (a). 31: metal frame, 31A: peripheral part, 31B: bottom part 32: collision plate, 32A: collision surface, 33: set screw

Claims (2)

(57) [Claims] 1. A collision plate for a jet pulverizer comprising a ceramic or cermet, wherein a metal frame is provided on a peripheral edge of the collision plate on a collision surface side. 2. A collision plate for a jet crusher according to claim 1, wherein said metal frame is provided with fixing means.