JPH0536551Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a sieving machine that sieves powder and granular material by vibrating a sieve frame on which a sieve screen is stretched.

(Problems to be solved by the prior art and the invention) When the sieve screen is stretched and fixed to the sieve frame in the sieving machine of the above type, it is customary to fix the outer edge of the sieve screen itself. By the way, when fine particles with a separation diameter of 150μ or less are sieved using the above-mentioned sieving machine, a sieve screen with a thin wire diameter and small openings is used, but such a sieve screen has low rigidity. The vibration transmission rate to the entire mesh surface is small.

If such a sieve screen is stretched and fixed to a sieve frame using the conventional method, the vibration of the sieve frame will not be sufficiently transmitted to the sieve frame, resulting in poor sieving effect.

The present invention was devised in view of the above circumstances, and an object of the present invention is to provide a sieving machine that can efficiently sieve even fine particles with a separation diameter of 150 μm or less.

(Means for Solving the Problem) In order to achieve the above object, the present invention uses a sieve screen having a band-shaped elastic member fixed to its outer edge, and moves the inner edge of the elastic member towards the inside of the sieve frame by a predetermined distance. It is characterized in that it is placed in a protruding position and its outer edge side is clamped and stretched between the mating flanges of the upper and lower frame bodies of the sieve frame.

(Structure) Hereinafter, the structure of the present invention will be explained in detail based on examples.

Fig. 1 is a longitudinal sectional front view of the sieving machine according to the present invention;
FIG. 2 is an enlarged view of section A in FIG. 1.

In the figure, reference numeral 1 denotes a box-shaped base set on the floor, and a plurality of springs 2 are arranged on the upper peripheral edge of the base 1, and the springs 2 are connected to a cylindrical sieve frame 3 with a bottom. is supported elastically. Said base 1
A vibrating body 4 is mounted upward in the center of the ceiling surface, and the tip of a piston rod 5 of the vibrating body 4 penetrates the ceiling surface of the base 1 and is fixed to the bottom surface of the sieve frame 3. The sieve frame 3 is a cylindrical upper frame body 6
and a bottomed cylindrical lower frame body 7, and an upper frame body 6.
The lower end flange of the lower frame body 7 and the upper end flange of the lower frame body 7 are integrally fastened through bolts 9 and nuts 11 with the outer edge of the sieve screen body 8 being held between them.

Now, the structure of the sieve mesh body 8 will be explained in detail.
12 is a circular sieve mesh woven from wire with an opening of 150 μm or less and an extremely thin wire diameter, and 13 is an elastic member made of natural rubber with a thickness of about 1 mm and a circular planar shape. The entire circumference of the inner edge of the elastic member 13 and the entire circumference of the outer edge of the sieve screen 12 are overlapped and fixed together with an adhesive. The outer diameter of the elastic member 13 is made equal to the outer diameter of the flange portion of the sieve frame 3, and the inner diameter is smaller than the inner diameter of the sieve frame 3 by a predetermined dimension. The outer edge side of the member 13 is the upper and lower frame bodies 6, 7
The inner edge side of the elastic member 13 is designed to protrude inward to the sieve frame 3 by a predetermined width when the elastic member 13 is clamped and fixed between the mating flanges of the sieve frame 3.

(Operation and Effect) In the sieving machine configured as described above, when the vibrating body 4 is operated, the sieve frame 3 vibrates up and down, and the vibration is transmitted to the sieve screen body 8. The portion of the elastic member 13 that protrudes inward of the sieve frame 3 vibrates vertically with a larger amplitude than the sieve frame 3. In other words, the vibration of the sieve frame 3 is amplified by the elastic member 13 and transmitted to the sieve screen 12, so even if the sieve screen 12 has low rigidity and low vibration transmission rate, it can vibrate sufficiently and produce good results. This provides a great sieving effect.

In the example, a sieve net body was used in which an annular elastic member was bonded to the outer circumference of a disc-shaped sieve screen. A sieve mesh body made of

In addition, we used a natural rubber elastic member to adhere to the outer periphery of the sieve screen, but the hardness of latex
The same effect can be obtained by using synthetic rubber with a temperature of about 30 degrees.

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional front view of the sieving machine of the present invention, Figure 2
The figure is an enlarged view of section A in FIG. 1... Base, 2... Spring, 3... Sieve frame,
4... Vibrating body, 6... Upper frame body, 7... Lower frame body, 8... Sieve mesh body, 12... Sieve mesh, 13... Elastic member.

Claims (1)

[Scope of utility model registration request] Sieve frame 3 composed of upper and lower frames 6 and 7
is mounted on a base 1 via a spring 2, and a vibrating body 4 is attached to the sieve frame 3.A band-shaped elastic member 13 is attached to the outer edge of the sieve screen 12.
The sieve mesh body 8 is made by fixing the elastic member 13 to the inside of the sieve frame 3 by a predetermined distance, and the outer edge of the elastic member 13 is positioned at the top of the sieve frame 3.
A sieving machine characterized by being clamped and stretched between the mating flanges of lower frame bodies 6 and 7.