JPS601825Y2 - Powder classification equipment - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology belongs to the field of air cleaning technology for vibrating sieves that separate and classify powder, such as powder classification.

This idea uses a vibrating device to vibrate a frame placed above the base via a spring, etc., to separate and classify the supplied powder through an internal sieve screen, and the coarse powder is discharged from the upper discharge port into fine particles. This invention relates to a vibrating sieve classifier in which the powder is taken out from the lower discharge port, and an airbrush is placed upwardly below the sieve screen to prevent clogging of the sieve screen. The air passage connected to the sieve screen is connected to a swivel joint type air joint provided on a bracket in the frame, and an air chamber that extends in the radial direction of the airbrush rotatably fitted to the air joint is connected to a large number of air passages facing the sieve screen. This invention relates to a powder classification device that is equipped with a nozzle for backwashing.

<Prior Art> As is well known, various separation and classification devices have been developed and adopted to prepare powder having a particle size distribution below a predetermined particle size for powder materials such as powder coatings. So-called vibrating screens are widely used because of their simple structure and good performance.

<Problems to be Solved> However, in the vibrating sieve, it is necessary to prevent clogging of the stretched sieve screen, and in order to deal with this, conventional methods have been to place balls, etc. under the sieve screen. A method was adopted in which the hammer was struck from below to prevent clogging. However, in this method, the lower balls etc. apply vibrations to the classified powder, so for example, the granulation of the powder coating, etc. If a powder is classified easily, it has the disadvantage of being easily granulated, and when such a classified powder is used for coating, it has the disadvantage of causing coating film defects such as so-called bumps and poor skin.

There is also a forced removal method in which scrubbers, rubber balls, etc. are placed on the sieve screen and mechanical actions such as wiping are applied.For example, #
When the mesh size is smaller than 200 meshes, there is a disadvantage that the effect is low, and it is difficult to put it into practical use in terms of maintenance and management, such as damaging the sieve mesh.

The purpose of this invention is to solve the technical problems of the vibrating sieve classifier based on the above-mentioned conventional technology, and to install an airbrush that vibrates self-excited by dissipative vibration under the sieve screen, facing the sieve screen. It is an object of the present invention to provide an excellent powder classification device that performs backwashing efficiently and is useful for powder application fields in various manufacturing industries.

<Means/effects for solving the problems> In accordance with the above-mentioned purpose, the structure of this invention, which is summarized in the scope of the above-mentioned utility model registration claims, is to use a radiation-type ultra-oscillation device during classification in order to solve the above-mentioned problems. By shaking the frame, the frame is vibrated in a dissipation type vibration due to rotational vibration, and the supplied powder is separated and classified in a predetermined manner by a sieve screen that also makes a dissipation type vibration together with the frame. At the same time, a swivel joint attached to the frame is arranged so that the airbrush underneath the sieve screen is automatically rotated by the dissipative self-excited vibration that follows the dissipative vibration of the frame. A technical measure has been taken to backwash the sieve screen by blowing the air supplied through the sieve upward, thereby making it possible to perform cleaning as desired.

<Embodiment - Configuration> Next, one embodiment of this invention will be described below based on the drawings.

Reference numeral 1 denotes a classification device embodying the gist of this invention, which is used for classifying powder paints.A base 2 fixed to a bed (not shown) has springs 3, 3 installed at equal intervals.
A cylindrical frame 4 is placed on the upper stage via...

The lower frame 5 of the frame 4 is provided with a conical chute 6 that protrudes concentrically upward, and has a discharge lower for fine powder on the outer periphery of its upper surface, and a fixed lower chute 6 at the center of its lower surface. Extended bracket8. A variable speed drive motor 9 is provided with an unbalanced weight 10 as a dissipating vibration excitation device similar to the conventional type, and applies a predetermined dispersing vibration to the frame 4 and its equipment. It is like that.

In FIG. 1, the unbalanced weight 10 is shown in the form of one block for convenience of illustration, but in the conventional well-known type, there are a plurality of unbalanced weights, for example, two unbalanced weights. The phase of the circumferential arrangement can be adjusted freely, and the radial vibration amplitude can be adjusted by the set phase difference.With a general phase difference, the radial vibration moves radially in the circumferential direction. However, as shown in Fig. 4, a rotating vibration is caused, and the object to be vibrated is therefore subjected to a vibration action and also receives a circumferential turning force, and an object supported and mounted diametrically is subjected to a self-excited turning action. .

Therefore, the fine powder on the conical chute 6 also rotates in the circumferential direction while being subjected to vibration.

A cylindrical upper frame 11 having the same diameter as the lower frame 5 of the frame 4 is fixed at the mutual flanges by appropriate means such as a tightening band, and a sieve screen of a predetermined mesh is attached to the upper part of the frame 4. 12 has a discharge port 13 for coarse powder on its upper 1 side, and a honeycomb-shaped bracket 14, 14 is fixedly installed at the bottom of the elbow-shaped bracket 14, which has an air passage 15 concentrically with the sieve screen 12. It supports a swivel joint type air joint 16.

The base end of the air joint 16 is fitted with a cap 18 having an air passage 17 and connected via a nut 19 to a hose 21 as an air passage having an air guide hole 20, and is connected to a compressed air source (not shown). There is.

Further, a nut 23 having an air chamber 22 is screwed and fixed to the upper end of the air joint 16, and the nut 23 has a hollow shaft extending downwardly from the center of a bar-shaped hollow airbrush 24 and communicating with it. 25 can rotate freely,
In addition, it is loosely supported in a sealed state so that it cannot be prevented from coming off, and the air passage 26 allows the air chamber 27 of the air brush 24 and the air chamber 22 of the nut 23 to communicate with each other in the swivel joint type as described above.

Note that the air chamber 27 of the airbrush 24 is equipped with a sieve screen 1.
A number of air nozzles 28, 28, .

Therefore, when the frame 4 performs the aforementioned radiation type vibration, the airbrush 24 receives the radiation type vibration, and as described above, is caused to perform a self-excited circumferential rotational movement.

Therefore, air is fed under pressure to the airbrush 24, and the airbrush 24 rotates in a self-excited manner.

Reference numeral 29 denotes an upper lid, whose flange is fixed to the upper frame 11 with a fastening band, and a powder supply port 30 is provided at the upper part of the lid.
is provided.

<Embodiment - Effect> In the above-described configuration, when the variable speed drive motor 9 of the dissipative vibration exciter is driven at the set rotational speed, the cushioning action of the springs 3, 3, etc. is caused through the operation of the peripheral device of the unbalanced weight 10. The frame 4 is caused to vibrate in a dissipative manner as shown in FIG.

Therefore, the frame 4 and the bracket 14.14
As mentioned above, the air joint 16 also receives the dissipative vibrations through the airbrush 24, which is supported and fitted to the nut 23 via the shaft 25. It rotates and begins to radiate vibrations.

Of course, along with this, the sieve screen 12 also receives radiation type vibration, and starts radiation type vibration in a self-excited vibration manner.

Therefore, for example, when powder coating raw materials are supplied from the supply port 30 by an appropriate supply device (not shown) such as a rotary feeder, the powder falling onto the sieve screen 12 is caused by its dissipative vibration, that is, by powder classification. Under optimal vibration, the coarse powder that does not pass through the sieve screen 12 is discharged from the coarse powder discharge port 13, and the coarse powder that has passed falls down and enters the chute. The fine powder bone is discharged from the fine powder bone discharge lower while receiving the same radiation vibration on the upper surface of the bone powder.

During this time, the airbrush 24, which is supported in a swivel joint type on the nut 23 of the air joint 16, is also synchronously or almost synchronously with the dissipative vibration of the powder on the sieve screen 12, as shown in FIG. As shown in the figure, the lower part of the sieve screen 12 automatically generates a dissipative vibration and rotates, and the air sent through the hose 21, air joint 16, and air passage 26 is sent upward from the nozzles 28, 28, and so on. so that it erupts into
The sieve screen 12 is backwashed following the rotating powder, so clogging is always prevented and separation and classification are performed with constant performance.

In this case, even if the drive speed of the drive motor 9 is changed depending on the amount and type of powder to be processed, the airbrush 24 automatically follows the sieving screen 12 and synchronizes with the dissipative vibration of the sieve screen 12.
, or because they are rotated in an approximate manner, clogging can be prevented regardless of the conditions of use.

As an experimental example in accordance with the above-mentioned embodiment, the rotation speed of the drive motor 9 was set to 360 rpm, whereby the powder on the vibration 12 was rotated at 3 (2) revolutions/minute by the dissipation vibration, and the horizontal axis represents the durability time and the vertical axis represents Taking the cumulative sieve weight as shown in Figure 3, comparing the data of the conventional technology and this invention, the former shows that clogging occurs earlier and the amount of sieve stacking is reduced as shown in graph A. In contrast, it can be seen that the latter is not clogged at all as shown in graph B.

<Other Examples> It goes without saying that the embodiment of this invention is not limited to the above-mentioned embodiments. For example, the nozzle of the airbrush may be changed to a hole shape and slit shape, or the airbrush may be changed to a slit shape. It is possible to adopt various embodiments in which it is not a T-type but an L-type.

Of course, the target is not limited to powder coatings.

<Effects of the invention> According to this invention, a frame having a sieve screen placed on the base via a bullet is equipped with a conventionally used dissipation-type vibration excitation device, and discharge ports are provided above and below the sieve screen. In the powder classification device, an air joint is provided in a bracket provided on a frame, an air chamber is extended outwardly in the air joint, and an air brush provided with a number of backwash nozzles facing a sieve screen is supported so as to be able to vibrate under self-excitation. Basically, in the process in which the sieve screen is given a dispersive vibration by a dispersive vibrator and the supplied powder is separated and classified in a predetermined manner, the airbrush is also synchronously subjected to self-excited vibration via the frame as described above. Therefore, as the airbrush follows the swirling vibration of the powder on the sieve screen and ejects backwashing air while rotating and vibrating in a dissipative manner, clogging is always prevented.
An excellent effect is achieved in that the separation and classification performance of the sieve screen is always maintained.

In addition, since backwashing to prevent clogging is performed with air, unlike vibrating hitting with a ball, etc., no granulation effect occurs, and in powder coatings, etc., no granules are generated in the classified powder, making it easy to use. This has the effect of providing an excellent painted surface that does not cause so-called "blurs" or other skin defects on the coated body coating film, and that a product with high precision can be obtained.

Furthermore, since the airbrush is pivotally supported by a radiation-type vibration excitation device so that it can self-excite vibration integrally with the frame, that is, integrally with the sieve screen, no special rotation mechanism is required.
Not only does it have the advantage of a simpler structure and easier manufacturing and maintenance, but it also completely automatically follows the dissipative vibration of the sieve screen even if conditions such as the amount of processed powder, mesh size, and frequency change. Since the cleaning function is self-excited and generates a dissipative vibration, the cleaning function remains constant without changing at all, which is an excellent effect.

In addition, since backwashing is performed using air, even if the mesh is as thin as the mesh, it can be backwashed without damaging the mesh in any way, so there is no change in the classification function.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention; Fig. 1 is an overall longitudinal sectional view, Fig. 2 is a plan view of the same, Fig. 3 is a graph explaining experimental data, and Fig. 4 is a model of radiation vibration. FIG. 1...Classifier, 2...Base, 3.
...Bunch, 4...Frame, 7.13.
...Discharge port, 9...Exciter, 12...
...Sieve screen, 14...Bracket, 15...
... Air chamber, 16 ... Air joint, 21 ... Air passage, 24 ... Cleaning brush (air brush), 27 - Song - Air chamber, 28 ... Song Air nozzle.

Claims (1)

[Scope of utility model registration request] In a powder classification device, a frame placed above a base via a bullet device is equipped with a dispersion-type vibration excitation device, has discharge ports at the upper and lower parts of the sieve screen, and has an airbrush for the sieve screen. The bracket provided in the air joint has an air joint connected to the air passage, and the air brush loosely fitted and supported by the air joint laterally extends another air chamber that communicates with the air chamber of the air joint, and the other air chamber is connected to the upper air joint. A powder classification device characterized by having a large number of air nozzles facing a sieve screen.