JPS604626Y2 - Sieving machine for powder etc. - Google Patents

Description

[Detailed description of the invention] This invention relates to a sieving machine that sieves powders, granules, etc.

Conventional sieving machines had a structure in which a sieve with a wire mesh, etc. stretched at the bottom of a hopper into which powder, etc. is introduced, is suspended from the hopper by a coil spring, and vibrations such as reciprocating motion are applied from the side of the sieve. However, in such a sieving machine, the load of the powder in the hopper is applied directly to the screen of the sieve, causing deformation or clogging of the screen, or the powder at the lower end of the hopper is supported by the screen and becomes clogged. In addition to being compressed and hardened by the load and preventing it from falling onto the sieve, there were other problems such as the sieve's vibrating operation being subjected to a heavy load, which impeded the vibration itself.

Furthermore, when the load on the sieve changes, the coil spring that suspends the sieve stretches, causing the gap between the sieve screen and the bottom end of the hopper to become too wide or too narrow.
There were also problems such as not being able to maintain an ideal gap between the net and the bottom end of the hopper.

This invention aims to provide a sieving machine that solves these problems.The lower end of the hopper is equipped with a guide surface with an angle facing downward and an inclined guide surface on the upper surface, and a relief guide that disperses powder etc. and allows it to fall. The feature is that the sieve is suspended by a leaf spring.

To explain in detail the embodiment shown below, FIG. 1 and FIG. 2 are a partially cutaway side view and a front view of the sieving machine of the present invention, in which angles and the like are framed in a rectangular shape and mounted on a base 1. A valve-shaped hopper frame 3 is horizontally attached to the upper front end of the upright main body frame 2, and the upper end of a hopper 4 is fixed to the hopper frame 3 and supported so as to be suspended.

At the center of the lower opening end of the hopper 3, a certain gap 6, 6 is provided between the front and rear inner wall ends of the lower opening 5 of the hopper 3.
A relief guide 7 is installed in the left-right direction, with the angle facing downward so as to leave a gap.

The relief guide 7 receives part of the load of the powder etc. put into the hopper 4 so that it does not hit the sieve net 8, which will be described next, and also uses slopes on both front and rear sides to pass the powder etc. into the gap between the front and back. Since the purpose is to distribute the powder into 6, 6 and allow it to fall smoothly, it is not necessarily limited to an angular cross section, but may also have a semicircular cross section, for example, and depending on the size of the hopper 4, a gap 6 for the powder to fall may be provided between each. It is also possible to provide a plurality of relief guides 7 in parallel.

At the bottom of the lower opening 5 of the hopper, a sieve net 8 made of a wire mesh, a perforated plate, etc. is provided, and a sieve 9 is supported horizontally so that it is positioned with a slight gap between it and the lower end of the opening. The sieve 9 has a sieve frame 10 formed in a rectangular shape so as to provide a certain gap between the sieve 9 and the outer periphery of the lower opening 5.
The hopper 4 is suspended by four tape-shaped leaf springs 11 fixed between the front and rear sides of the hopper 4 and the front and rear sides of the hopper 4 so as to be able to swing back and forth.

As shown in FIG. 3, the sieve 9 has a structure in which a movable frame 10a that can be inserted and removed like a drawer is inserted into the right or left side of the sieve frame 10, and the net 8 is inserted into the lower end of the movable frame 10a. It is stretched and fixed around its outer circumference.

This structure makes it easy to remove large particles and other contaminants remaining on the sieve 9, and the sieve can be easily removed even when replacing the screen depending on the type of powder, particle size, or purpose of sieving. There is no need to remove and replace the net, and replacing it will be even easier if several types of nets are prepared and fixed to separate movable frames.

On the other hand, a motor 12 for driving the sieve is mounted on a mounting base 15 provided in the main body frame 2, and a crank 13 that eccentrically rotates in response to the rotational driving force of the motor is mounted in an arbitrary manner. The crank 13 and the rear surface of the sieve frame 10 are connected by a connecting rod 14 made of one or more links or rods, and when the crank 13 is rotated by the rotation of the motor, the sieve 9 The mechanism is such that it provides reciprocating vibrations back and forth.

Below the hopper lower opening 5 through the net 8, a container for receiving powder, etc. that is sieved and falls, or a conveying means such as a belt conveyor (none of which is shown) is installed, and the sieve 9 A cylindrical cover 16 made of cloth or the like is installed on the outside of the unit to prevent powder and its dust from scattering outside.
is suspended and hanging from the outer periphery of the hopper 4.

This device is constructed as described above, and as a result, when a powder such as wheat flour is put into the hopper 4 and sieved by giving vibration to the sieve 9, the entire load of the powder is transferred to the sieve net 8. Part of the powder is received by the upper surface of the relief guide 7 to reduce the load applied to the net 8, and the powder is distributed between the front and rear gaps 6, 6 by the slope of the upper surface of the relief guide 7, and the powder, etc. is collected in this gap. It falls smoothly onto the sieve through the screen 8, and there are no problems such as clogging or deformation of the mesh 8 or interference with vibration.

In addition, since the powder, etc. falls divided into gaps 6, and the powder does not fall onto the net 8 at the bottom of the relief guide 7, the areas on the net 8 where the powder falls and the areas where it does not fall alternate. This has the effect of greatly improving the efficiency of the sieve.

Furthermore, since the sieve is suspended by the leaf spring 11, the gap between the lower end of the hopper and the screen does not change depending on the amount of powder, etc. to be thrown in, and the elasticity of the leaf spring works during vibrations, causing vibration. This has the advantage of being carried out smoothly and stably.

[Brief explanation of the drawing]

Figures 1 and 2 are a partially cutaway side view and front view showing the overall structure of the sieving machine of the present invention, and Figure 3 is a perspective view showing an example of the structure of its constituent parts. be. 1: Base, 2: Main frame, 3: Hopper frame,
4: Hopper, 5: Lower opening, 6: Gap, 7: Escape guide, 8: Sieve net, 9: Sieve, 10: Sieve frame, 1
0a: Movable frame, 11: Leaf spring, 12: Motor, 13:
Crank, 14: Connecting rod, 15: Mounting base, 16: Cover.

Claims (1)

[Claims for Utility Model Registration] 1. A sieve 9 is swingably suspended below the lower opening 5 of the hopper 4, and the sieve 9 is vibrated to sieve the powder etc. put into the hopper 4. In the mechanism, the sieve 9 is suspended from the hopper 4 by leaf springs 11 at the front and back, and a gap 6 having a constant width is formed in the lower opening 5 between the inner peripheral wall and the upper surface. A sieving machine for powder, etc., which is fixedly provided with a relief guide 7 having an inclined surface that supports a part of the load of the powder, etc. and allows the powder, etc. to fall smoothly through the gap 6. 2. Powder, etc. according to claim 1 of the utility model registration claim, in which the sieve 9 is formed by inserting the movable frame 10a with the net 8 stretched therein into the sieve frame 10 in a drawer-like manner so that it can be freely inserted and removed. sieving machine.