JPS58153545A - Vibration screen for stirring type ballmill - 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 provides a stirring ball mill for separating a material to be pulverized (hereinafter referred to as a pulverized body) and a pulverized suspension (hereinafter referred to as a pulverized suspension). The separator can be attached to a side wall or an end wall of a stirred ball mill trough and is configured as a sieve.

In the case of a separator of an agitated ball mill that runs at a rapid speed, the free crushed bodies are sent to the crushing hopper, and one side is not provided with a connecting pipe for continuously conveying the workpiece, and the crushing hopper is Since on the other side a separation device for separating the grinding body from the workpiece is arranged, a high fluid resistance occurs due to the non-Newtonian, pseudoplastic and thixotropic properties of the fluid. I know that. For an overview of the problems with the separation and sealing device of fine sand ball mills, which are well known, see, for example, "Farbe and Lack J.
Colors and varnishes) volJ'7 (/9za/), /I/2!
; disclosed in;

According to this, a sieve and a vibrating slit are known as separating devices for the front wall or end wall of the trough.

For example, 0. Due to the difficulties encountered in the case of very small grinding bodies of Oj -0.31 ms, it is not recommended to use separate separating devices, for example vibrating screens in open or closed circuit.

However, even for economic reasons alone, this separation device cannot be considered very promising.

German Patent Publication No. 2'i l 31I/ proposes the use of a separating device with a vibrator, which is provided in such a way that at least one separating material can be vibrated. In this case, the separating device (1) also consists of several slits arranged one behind the other or one behind the other.

In particular, an annular slit is preferred.

Although these separation devices do reduce fluid resistance, they are relatively expensive, prone to failure, and have low performance.
It is.

An object of the present invention is to provide a high-performance separation device that is capable of separating particularly small pulverized bodies, is convenient for maintenance, and is trouble-free.

In the separator according to the present invention, the above purpose is to remove the sieve from the machine frame (
7) supported by the machine frame 1 and elastically sealed with the side wall or end wall of the trough, and further provided with a vibrating device, by means of which the machine frame can be vibrated. This is achieved through a unique configuration.

According to one example embodiment, a planar screen is stretched within the machine frame.

In another advantageous embodiment, the screen surface is larger than the free cross section of the machine frame.

The machine frame can then be constructed in such a way that the sieve surface protrudes into the trough or is arranged such that the sieve surface lies within the trough wall. (
or) the amplitude changes.

In another embodiment, it is particularly advantageous to drive the sieve in a constant oscillating manner, for example in a linear or circular or elliptical motion. It is.

Using the device according to the invention, approximately 5
Separating crushed bodies with diameters down to 0 μm...
I can do that.

Various sieve surfaces can be formed by the support plate and the protection plate.

The separating device can also be easily and quickly adapted to a variety of different functions (one mesh width of material).

According to the sieve, the pulverized bodies are not crushed and the mesh is not clogged at all.

It is known that in the case of known separators with annular slits, during operation, the grinding bodies reach the slits several times and are crushed in the process.

In addition, the slit may be damaged at that time.

However, in the case of a vibrating sieve, the alternating flow in both directions does not have the effect of superimposing the suspension stream, and its outward components deposit particles in the λ sieve plate. It is possible to obtain the effect that there is no problem at all.

The sieve surfaces in the separator can be arranged in such a way that direct impingement of the grinding bodies against the sieve surfaces is avoided.

Although various forms of vibration are known, particularly advantageous is the three-dimensional movement of a vibrating screen. This is because in this method the grinding bodies on the sieve surface are not carried away again but mix with the remaining contents of the grinding trough. Therefore, the crushed particles do not aggregate in front of the sieve. Compared to prior art separation devices, it has inter alia the following advantages:

As a result of the larger free sieve surface, the throughput can be increased with a minimum pressure drop.

The throughput based on the dimensions of the machine frame (7) is increased by a factor of 10 or more. Therefore, for example, with a vertical lift separator according to the prior art, a loading of 203 A (D) can be achieved in the grinding chamber under a pressure of 2.5 bar, whereas the corresponding size of the separator With the vibrating sieve, it is possible to obtain a throughput of 1/30 L/h with a pressure drop of 0./bar, all other things being equal.

Since in this example the charge amount was limited by the grinding power of the ball mill, the limiting power of the separator could not yet be reached at this point (in this case). On the other hand, the separation surface of the device according to the invention is significantly smaller than in the case of conventional cartridge sieves.

In order to clean the blockages, single-force sieves and stirring ball mills have not been effective in the past.

Vibrating sieve surfaces ensure reliable evacuation of the suspension, whereas with other separation devices reverse stagnation and the resulting pressure increase are unavoidable in the case of structurally viscous products. .

In experiments in which organic pigments were sprinkled, strongly thixotropic products flowed cleanly from the vibrating sieve.

The vibrating sieve should be constantly washed with the above products.
Can be placed in a ball mill. Therefore, the dispersion
Surface drying around the sieve can be avoided. In order to reduce sieve abrasion, the sieve should be protected from direct impact from the grinding bodies.

For use in cases where the sieve plate is arranged parallel to the flow direction. The so-called sandblasting effect is overcome.

As shown in the example in the attached drawing. When sieving is arranged, wear and tear due to impact are significantly reduced; the separator is simple, affordable, reliable, and easy to maintain. Screen replacement is accomplished by loosening some screws.

Vibrations in the machine frame can be generated by an electromagnet or an ultrasonic generator.

The frequency and amplitude of the vibrations are influenced by the structure of the separation element and the fit of the transducer. It is advantageous that the frequency and amplitude of the vibration device can be adjusted.

Separation device example 1 according to the invention As shown in the accompanying drawings, FIG.
It has a mesh between oooμ1m.

The sieve lFi is supported on a perforated plate 2.

One sieve plate is fixed to seven run jigs by a locking ring 3.

The sieve plate/Fi, the product chamber space J in contact with the trough wall B
It doesn't stick out inside. The machine frame (7) is fixed to the flange (1) to hold the sieve (1) and match the size of the opening in the lid of the stirring ball mill.

The suspension is discharged via the discharge housing Ir1 and the product outlet connecting pipe 9.

The separation device is attached to the trough wall by means of a diaphragm 13 and sealed in the waste chamber by means of the diaphragm 13, allowing vibration of the sieve 1).

At and \, a ball vibrator 10 (compressed air coupling l/1 muffler/2) is arranged to generate the movement of the sieve plate /.

The height and diameter are adjusted so that the spring rod/glue frame 7 can be vibrated in the desired vibration form by the vibrator lo together with the sieve/sieve.

FIG. 2 shows that a separation device is installed on the side wall of a stirring ball mill.

Parts having similar functions are provided with the same reference numerals as in FIG.

The flange II has a Shimada cylindrical shape and is dimensioned to match the internal contour of the trough on the inwardly facing side of the stirred ball mill.

The sieve plate l is located substantially parallel to the flow direction within the product chamber.

It is also possible to configure the interior lj into a linear cylinder so that one floor is covered with the sieve plate.

The less the sieve protrudes into the product chamber S, the more the sieve is protected against direct impact by the grinding body.

In the case of the separator shown in FIG. 3, the sieve surface is larger than the machine frame cross section. Here again, parts having similar functions are provided with the same reference numerals as in FIGS.

[Brief explanation of the drawing]

Figure 7 is a cross-sectional view of a separation device installed in the trough side wall of a stirred ball mill. Figure 2 is a cross-sectional view of a separation device installed in the trough side wall of a stirred ball mill. Figure 3 has an enlarged sieve surface. Cross-sectional view of the separation device/... vibrating sieve plate, 2... perforated plate, 3... telescopic ring 11... 7 langes, 5... product space, t.
...trough wall, 7...machine frame, za...discharge housing...
9...Product discharge pipe 11O...Ball vibrator,
ll...Compressed air fitting, 12...Subbing rod 1, 13...Diaphragm, 15...Name of indoor representative
Kawahara 1) - Ear

Claims (8)

[Claims] (1) Separation of a stirred ball mill, in which the separation device can be attached to the side wall or the end wall of the trough of the stirred ball mill and is configured as a sieve, serving to separate the grinding material and the suspension to be ground. In the device, the sieve (1) is held by a machine frame (7), and the machine frame (7) is
1. The above-mentioned agitation is characterized in that it is elastically sealed to the trough side wall or end wall (6) and is provided with a vibrating device (lO), so that the machine frame (7) is vibrated by the vibrating device. Separation device for type ball mill. (2) The separation device according to claim 1, characterized in that a single planar sieve (1) is stretched within a machine frame (7). (3) The separation device according to claim 1, characterized in that the sieve surface is larger than the free cross section of the machine frame depending on the arbitrary spatial configuration. (4) The separation device according to any one of claims 1 to 3, wherein the sieve surface protrudes into the trough. (5) The separation device according to any one of claims 7 to 3, wherein the sieve surface does not protrude into the trough. (6) The vibration frequency and/or in the vibration device (10)
A separating device according to any one of claims 1 to 3, characterized in that the amplitude is variable. (7) A certain form of vibration of the machine frame (7) causes the sieve (1
) The separation device according to any one of claims 1 to 6, characterized in that it is activated together with a device. (8) Separation device 0 according to claim 7, characterized in that the machine frame (7) is three-dimensionally vibrated and bent.