JPS59222238A - Vibration stamp mill - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stamp mill, and particularly to a stamp mill suitable for pulverizing metal to produce metal powder.

BACKGROUND OF THE INVENTION Conventionally, stamp mills and v have been used to crush various metals to produce fine granular powder or flaky powder.

This stamp mill performs pulverization by lifting the pestle from the bottom plate and letting it fall onto the bottom plate under its own weight, but in order to use it for crushing metal, this pestle must be extremely large (for example, 2mm long).
IL1 weight is approximately 60 kg), and the distance over which it is dropped under its own weight must be as long as 10 to 30 cIIL. Therefore, not only the device becomes large and the equipment cost becomes large, but also a large installation space is required. In addition, it is difficult to make the crushing part a sealed structure, which causes a lot of noise, and also requires a dust collector because the fine powder is scattered around. Furthermore, conventional stamp mills have the disadvantage that it is difficult to produce ultrafine powder, for example, about 10 μm.

The present invention was made in view of the drawbacks of the prior art,
To provide a stamp mill that is relatively small in size, has low noise, and can produce fine granular powder or flaky powder.

The stamp mill according to the present invention includes a bottom plate, a grinding container fixed to the bottom plate, a pestle movable vertically within the grinding container so as to collide with the bottom plate, and a spring attached to the pestle in a direction toward the bottom plate. It is characterized by comprising a spring means for applying force and a vibration generating amount for vibrating the bottom plate.

Embodiments of the present invention will now be described in detail as illustrated in the accompanying drawings.

In FIGS. 1 and 2, a vibratory stamp mill, designated as a whole by reference numeral 1, has a bottom plate 2 and a cylindrical grinding container 3 fixed on the bottom plate 2. The bottom plate 2 has a hard metal mirror plate 4 at its center. The upper end of the grinding vessel 3 is closed with a cover 5, which holds a guide sleeve 6 in the center. The guide sleeve 6 has an inner sleeve 7 made of plastic, rubber or the like (for example urethane) in which a punch 8 is held slidably in the vertical direction. The punch 8 has a striking part 8A made of hard metal at the lower end, and the striking part 8A is connected to the mirror plate 4.
The metal particles located between them are crushed by strong collision with the metal particles.

A head cover 9 is attached to the upper end of the guide sleeve 6, and a coil spring 10 is attached between the top wall of the head cover 9 and the upper end of the punch 8. The coil spring 10 applies a downward spring force to the punch 8, and thus in a direction toward the bottom plate 2. Instead of the coil spring 10, other types of springs, such as leaf springs and disc springs, may be used, and furthermore, elastic materials such as rubber and sponge, air springs, etc. may be used. . Moreover, instead of arranging the coil spring 10 on the punch 8, a tension spring or a compression spring may be arranged in parallel to the side of the guide sleeve, and the spring applies a downward force to the punch 8. .

The bottom plate 2 is attached to a vibration plate 13 supported by a frame 12 via a spring 11 with bolts 14 and nuts 15, and a vibration generator 1 is attached to the bottom surface of the vibration plate 13.
6 is installed. The vibration generator 16 is the vibration plate 1
3 and the bottom plate 2 thereon at least in the vertical direction, and any known rotary or electromagnetic vibration generator can be used. In the illustrated embodiment, a rotary vibration generator 16 is used which generates vibration by rotating an eccentric weight as shown by the arrow, and vibrates the bottom plate 2 not only in the vertical direction but also in the horizontal direction in FIG. In the above embodiment, the bottom plate 2 is removably provided on the vibrating plate 13, but the bottom plate 2 and the vibrating plate 13 may have an integral structure.

Next, the crushing operation in the above device will be explained. Metal particles to be crushed are introduced into the crushing container 3 through an input port (not shown) provided in the cover 5, and the input port is closed (3). Next, the vibration generator 16 is activated to vibrate the bottom plate 2. Then, due to the vibration of the bottom plate 2, the pestle 8 is flipped up, and then pushed back downward by its own weight and the force of the spring 10, colliding strongly with the end plate 4 of the bottom plate 2, flipped up again, and then pushed back downward, and so on. In the end, the punch 8 itself vibrates while repeatedly colliding with the mirror plate 8. In this way, the metal particles are crushed between the punch 8 and the mirror plate 4, which repeatedly collide with each other.

What should be noted here is that the punch 8 automatically vibrates in response to the vibration of the end plate 4 and by the action of the spring 10, and while the end plate 4 is rising, the punch 8 descends and collides with it. For this reason,
When the punch 8 and the end plate 4 collide, the relative speed between the two is high, and therefore a large impact force is obtained. Moreover, the number of collisions per unit time between the punch 8 and the head plate 4 (equal to the frequency of vibration of the punch 8) is a fraction of the frequency of the head plate 4, for example, the frequency of the head plate is 3000/min. Therefore, the number of collisions between the punch 8 and the mirror plate can be approximately 1000 times/min. Therefore, in the conventional falling type stamp mill using only its own weight, the number of collisions is approximately 60 times/min. Compared to the conventional method, the collision frequency is much higher and the crushing efficiency is higher. For this reason, the punch 8 is lightweight and its width varies depending on the spring constant and preload of the spring 10, the frequency and amplitude of the vibration generator, and the like.

In the production of metal powder using a conventional stamp mill, the impact force required by the punch varies depending on the type of metal, raw material particle size, shape and particle size of the resulting metal powder, etc. For example, fine powder is produced from relatively large particles. requires multiple steps, each with a different impact force. However, with conventional stamp mills, it is extremely difficult to change the impact force.
In reality, stamp mills are used for each process.

For this reason, there are drawbacks such as the need to have many stamp mills and the need to transfer the material crushed by one stamp mill to the next stamp mill. It is possible to set a wide range of conditions by changing the frequency and amplitude of the vibration generator, and a single device can be used for a variety of applications. It is also possible to grind it to a fine powder.

The metal particles put into the crushing container 3 are crushed between the pestle 8 and the end plate 4, but because the bottom plate 2 vibrates, they are constantly stirred on the bottom plate, and the whole is extremely uniform. crushed into

After pulverizing for a predetermined period of time, the outlet 17 at the lower end of the side surface of the pulverizing container 3 is opened while the bottom plate 2 is vibrated. Then, the metal powder is automatically taken out of the crushing container 3 by the vibration of the bottom plate 2. This completes one crushing operation.

To crush metals that easily oxidize without oxidizing them,
This may be carried out by filling the crushing container 3 with an inert gas.

5. In the above embodiment, the upper end of the crushing container 3 is sealed with the cover 5, but it is not necessarily necessary to seal it, and a large hole may be made in the cover 5 so that the inside can be observed.

When we conducted a grinding test using the device shown in Figure 1, we found that although it was much smaller than a conventional stamp mill, it was able to produce both granular powder and flaky powder, and it was also able to produce ultra-fine powder, which was previously unobtainable. It has been confirmed that this is possible.

Example raw material: 5US4], OL Average particle size 50μm Particle content below 0μm 0.5% Vibrating stamp mill specifications: The structure is as shown in Figure 1. Weight of the pestle: 14.5 Rubber bottom plate vibration frequency: 960/min Punch frequency: approx. 600/min Operation time: 24 hours Grinding product: Average particle size: 13 μm Particle content below 0 μm: 31% In the examples shown in Figures 1 and 2, one pestle is placed in one grinding container on one bottom plate. Although this is an example used, the present invention is not limited to this, and the number of crushing containers and pestles can be increased or decreased as appropriate.

In FIG. 3, two crushing containers 30 are mounted on one vibrating plate 130, and a plurality of punches 80 are arranged in each crushing container.

This embodiment has the advantage of significantly increasing production.

The present invention provides the following advantages over conventional stamp mills.

(b) Compared to conventional stamp mills, it is extremely compact, requires less installation space, and has lower equipment costs.

(-) No installation foundation work is required and it can be made mobile.

(c) It is possible to extremely efficiently produce ultrafine powder of metals (SUS, etc.) that are difficult to produce using conventional stamp mills.

(=) Since the entire device is small, soundproofing is easy.

(e) Since the vibration of the device is absorbed by the spring, no external vibration occurs at all.

(f) The crushing conditions can be changed over a wide range by selecting the spring and setting the conditions of the vibration generator, and it is possible to produce flaky powder and granular powder of various metals.

(g) Since it is easy to seal the crushing section, it has the following advantages (8). ■Prevents fine powder from scattering to the outside so that the working environment is not compromised. ■Can prevent foreign matter from entering from outside. ■Suitable for grinding high-purity metals. ■ By filling in inert gas, metals that are easily oxidized during grinding can be prevented from oxidizing.

(S) It is easy to take out the metal powder after crushing.

(Zeng) Maintenance is easy because the structure is simple.

(j) It is possible to grind different types of metals by replacing the grinding container, and it is also suitable for small-scale grinding.

Note that, although the above explanation is for the case where the vibrating stamp mill of the present invention is applied to the pulverization of metal powder, the present invention is not limited thereto, and may be applied to the pulverization of other substances.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of one embodiment of the present invention, and FIG.
3 is a horizontal sectional view of another embodiment different from the above. 2... Bottom plate 3... Grinding container 4... End plate 6... Guide sleeve 8... Pestle
10...Coil spring 11...Spring
13... Vibration plate 16... Vibration generator agent Patent attorney Kyozo Norimatsu (11) Fang 1 diagram

Claims (1)

[Claims] a bottom plate, a grinding vessel fixed to the bottom plate, and a pestle vertically movable within the grinding vessel to impinge on the bottom plate;
A stamp mill comprising: a spring means for applying a spring force in a direction toward the bottom plate to the punch; and a vibration generator for vibrating the bottom plate.