JPS596709B2 - Powder sieve frame consisting of an outer frame and an inner frame - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION In the present invention, several kinds of inner frames and outer frames are made separately from synthetic resin, and these are combined as appropriate to sieve the powder to obtain many kinds of powder. The present invention relates to a synthetic resin sieve screen characterized by the engagement between the inner frame and the outer frame in the sieve frame.

Traditionally, wooden sieve frames have been used in flour milling, etc., but since sieve frames need to withstand intense mechanical movement, high-quality woods such as magnolia and cypress have been used.

However, due to the lack of high-quality wood and the need for special woodworking techniques, there is a shortage of engineers, and the production costs are extremely high. Furthermore, due to the nature of wood, it is impossible to make the sieve frame a very complicated structure.
Furthermore, there was a structural defect in that a gap was created between the inner frame and the outer frame. For this reason, as shown in FIG. 1, there has been an inconvenience that large powder particles are mixed into the fine powder particles that have been sieved. The present invention converts the material from wood to synthetic resin to create a more complex structure compared to wooden ones, that is, a structure in which the inner frame and outer frame partially fit together, and utilizes the elasticity of the synthetic resin. The synergistic effect of the pressure of the inner frame and the tension of the sieve screen stretched over the inner frame increases the adhesion between the inner frame and the outer frame at the fitting part, making it possible to create a sieve screen without problems such as powder leakage. This is what we provide.

The present invention will be specifically described below with reference to drawings showing examples.

Fig. 2 is a plan view showing one type of outer frame, Fig. 3 is a partially omitted sectional view taken along line 1-1 in Fig. 2, and Fig. 4 is a plan view showing one type of outer frame. 5 is a sectional view taken along the line 1--2, and FIG. 5 is a partial sectional view of a portion of the inner frame. The outer frame A is provided with three powder discharge ports 9, 10, and 11, and the edge frame shown in cross section 1-1 is one layered and the other side with the powder discharge port 10 has a partial lower part. It has a double structure of an open inner edge frame 1'' and a completely closed outer edge frame 1''.

Moreover, the edge frames shown in cross section ■1■ have a double structure of an inner edge frame 2 and an outer edge frame 2'. A projecting piece 4 having a protrusion 3 is provided at the top end of the upper edge of these edge frames 1, 2, and 2, facing inward, and a recess 5 is provided in each of the edge frames 1,
are laid out appropriately. On the other hand, a locking piece T having a groove into which the protrusion 3 of the outer frame A fits is provided near the outer surface of the edge frame 6 of the inner frame B shown in FIG. At a position corresponding to the recess 5 provided in the frame A, a protrusion 8 that fits into the recess 5 is provided.

To fit the inner frame B to the outer frame A having the above structure, the inner frame B
This is achieved by inserting the inner frame B from below into the outer frame A and pushing it in until the protrusion 8 of the inner frame B fits into the recess 5 of the outer frame A (Fig. 6).

By fitting the protrusion 8 into the recess 5 in this way,
Since the locking piece 7 of the inner frame B is fitted to the protruding piece 4 of the outer frame A while applying pressure, for example, the protruding piece 3 of the protruding piece 4 of the outer frame A
Airtightness is maintained between the W plane of the inner frame B and the X plane of the locking piece 7 of the inner frame B, and a pulling force always acts on the inner frame B toward the center due to the tension of the sieve screen 16. Therefore, airtightness can be maintained also on the Y plane of the protruding piece 4 and the Z plane of the locking piece 7.

Due to the airtightness in the vertical direction (W plane and It is possible to prevent unnecessary leakage between the container and the outer frame A from other than the outlet. In addition, when stacking sieve frames, the outer frames are fixed to each other by fitting the protrusions 12 provided on the lower surface of the rim frame into the grooves 13 provided on the upper surface of the other outer frame, and furthermore, the lower end of the rim frame of the inner frame B 15 is fitted into another groove 14 of the outer frame A to maintain double airtightness.
Furthermore, the sieve frame of the present invention can be mass-molded using a mold,
Furthermore, by creating the minimum necessary reference frames and appropriately combining them, powders of various particle sizes can be efficiently sieved.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a conventional wooden sieve frame, Fig. 2 is a plan view showing an embodiment of the outer frame according to the present invention, and Fig. 3 is a sectional view of a conventional wooden sieve frame.
4 is a partially omitted sectional view taken along line 1, FIG. 4 is a partially omitted sectional view taken along the same line as above, FIG. 5 is a partially omitted sectional view showing one embodiment of the inner frame, and FIG. A cross-sectional view when the outer frame and the outer frame are fitted together is shown.

Claims (1)

[Claims] 1. In a synthetic resin sieve screen constituted by an outer frame A and an inner frame B on which the sieve screen is stretched, protruding pieces 4 are provided that protrude inward from the upper edges of the edge frames 1, 1', and 2. At the same time, an outer frame having a recess 5 provided on the lower inner surface of the edge frame 1, 1' and an inner frame having a locking piece 7 provided on the upper outer surface of the edge frame 6 and a protrusion 8 provided at the lower part thereof are fitted. A sieve screen for powders characterized by the following.