Hinge type fine screening grading wheel structure of superfine flour mill

Abstract

The utility model relates to a hinge type fine screening grading wheel structure of a superfine flour mill, which comprises an upper wheel disc and a lower wheel disc which are coaxially arranged, and blade groups which are annularly and uniformly distributed between the upper wheel disc and the lower wheel disc, and each blade group consists of an inclined blade and a straight blade which is propped against the side surface, close to the outer end, of the inclined blade; the upper wheel disc and the lower wheel disc are each provided with an inclined inserting groove allowing the upper end and the lower end of each inclined blade to be inserted, embedded and fixed, straight inserting grooves allowing the straight blades to be inserted, embedded and fixed are correspondingly formed in the sides of the inclined inserting grooves, and a hub is coaxially and fixedly arranged in the lower wheel disc. And the inclined slot and the straight slot are welded for stable limiting, so that the grading wheel is safer and more stable, and the grading wheel granularity ending effect is good.

Description

Technical Field

[0001] The utility model relates to a folding-leaf fine screen grading wheel structure of an ultrafine grinding mill. Background Art

[0002] The classifying wheel is a very critical component in the ultrafine grinding mill equipment. It can accurately separate particles that meet the fineness requirements according to production needs. Usually, the classifying wheel runs at high speed during operation. A large amount of fine powder and airflow will pass through the classifying wheel and wash the blades of the classifying wheel, further wearing the blades and shortening the service life. Coarse powder is not allowed to pass through the classifying wheel, which requires the structural design of the classifying wheel to be reasonable and the blades to be wear-resistant. In a disclosed classifying wheel with labyrinth-type rotating blades - CN207401758U, the wear resistance is good and the grading effect is accurate, but the blades are too densely distributed and the gap between the blades is small, which easily generates local eddy currents. They are all welded to the wheel frame. The amount of welding during assembly is large and there is also a risk of desoldering due to high-speed operation, which urgently needs to be improved. Utility Model Content

[0003] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a folding-leaf fine screen grading wheel structure for an ultrafine grinding mill, which is not only structurally reasonable but also safe and stable.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: the folding blade fine screen grading wheel structure of the ultrafine grinding mill includes a coaxially arranged upper wheel disc and a lower wheel disc and a blade group evenly distributed in an annular shape between the upper wheel disc and the lower wheel disc, and the blade group is composed of inclined blades and straight blades connected to the side surfaces near the outer ends of the inclined blades. The upper wheel disc and the lower wheel disc are both provided with inclined slots for the upper and lower ends of the inclined blades to be inserted and fixed respectively, and the sides of the inclined slots are correspondingly provided with straight slots for the straight blades to be inserted and fixed, and a hub is coaxially fixed in the lower wheel disc.

[0005] Furthermore, the extending directions of the inclined blades are coaxial with the upper wheel disc and the lower wheel disc, and the inclined blades are scattered and evenly distributed at equal angles, that is, the center lines of the inclined blades coincide with the axis lines of the upper wheel disc and the lower wheel disc, and the included angle is 0.

[0006] Furthermore, an embedding hole for embedding the hub is opened at the center of the lower wheel disc, and a guide hole is coaxially opened at the center of the upper wheel disc to facilitate discharge, and the diameter of the guide hole is larger than the embedding hole.

[0007] Furthermore, the inclined blades are all in the shape of a right-angled trapezoid to form a trumpet-shaped discharge channel with a larger upper portion and a smaller lower portion to match the guide hole. The inclined sides of the inclined blades are located inward and the right-angled sides are located outward. The upper and lower ends of the inclined blades are protruding with inclined insertion protrusions to facilitate insertion into the inclined slots.

[0008] Furthermore, the size of the oblique insertion protrusion at the upper end of the oblique blade is smaller than the size of the oblique insertion protrusion at the lower end of the oblique blade, and the size of the oblique slot of the upper wheel disc is smaller than the size of the oblique slot of the lower wheel disc.

[0009] Furthermore, the straight blades are rectangular, and straight insertion protrusions of the same size are fixed on the upper and lower ends of the straight blades.

[0010] Furthermore, the included angle between the straight blade and the oblique blade in the same blade group is 18°.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. Large blade gap helps reduce local eddy currents between blades.

[0013] 2. The outer side is a straight blade, designed to bend backward with an angle of 18° to reduce the back vortex on the leeward side of the blade.

[0014] 3. The inner side is an inclined blade designed to pass through the center of the circle with an angle of 0°, which can make the fluid flow out quickly and reduce the backflow phenomenon near the leeward side of the blade at the outlet, achieving the effect of efficient classification.

[0015] 4. The structure is reliable, the welding amount is small, and the dynamic balance is easy.

[0016] 5. Good classification effect. For the same classification fineness, the classifying wheel has a low speed and a good particle size finish.

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of the utility model;

[0019] Figure 2 A top view of an embodiment of the present utility model;

[0020] Figure 3 for Figure 2 Cross-sectional view of AA;

[0021] Figure 4 for Figure 2 Cross-sectional view of the middle BB;

[0022] Figure 5 A bottom view of an embodiment of the utility model;

[0023] Figure 6 This is a front view of an embodiment of the utility model;

[0024] Figure 7 for Figure 6 Cross-sectional view of CC;

[0025] Figure 8 This is a schematic diagram of the structure of the oblique blades in the embodiment of the present utility model;

[0026] Figure 9 This is a schematic diagram of the structure of the straight blade in the embodiment of the present utility model.

[0027] In the figure: 1-upper wheel disc, 2-lower wheel disc, 3-blade group, 4-oblique blade, 5-straight blade, 6-oblique slot, 7-straight slot, 8-wheel hub, 9-shaft sleeve, 10-embedded hole, 11-guide hole, 12-discharge channel, 13-oblique protrusion, 14-straight protrusion. DETAILED DESCRIPTION

[0028] In order to make the above features and advantages of the present invention more obvious and easy to understand, embodiments are given below with reference to the accompanying drawings for detailed description.

[0029] like Figures 1 to 9 As shown, the folding-blade fine screen grading wheel structure of the ultrafine grinding mill comprises a coaxially arranged upper wheel disc 1 and a lower wheel disc 2 and a blade group 3 evenly distributed in a ring shape between the upper wheel disc and the lower wheel disc, the blade group consists of oblique blades 4 and straight blades 5 connected to the side surfaces near the outer ends of the oblique blades, the upper wheel disc and the lower wheel disc are both provided with oblique slots 6 for the upper and lower ends of the oblique blades to be inserted and fixed respectively, and straight slots 7 for the straight blades to be inserted and fixed are correspondingly provided on the sides of the oblique slots, a hub 8 is coaxially fixed in the lower wheel disc, and a shaft sleeve 9 for connecting the drive shaft of the discharge end of the ultrafine grinding mill is provided in the hub, the grading wheel of the ultrafine grinding mill rotates counterclockwise, and the deflection angle direction of the straight blades is set along the rotation direction of the grading wheel, that is, the structure of the blade group is consistent, consisting of oblique blades and straight blades connected to the right side wall near the outer end of the oblique blades and extending outward at an angle of 18° to the right.

[0030] In an embodiment of the present invention, the extension direction of the inclined blades is coaxial with the upper and lower wheel discs, and the inclined blades are scattered and evenly distributed at equal angles. There are 40 inclined blades and straight blades, and they are all made of wear-resistant materials, which reduces the number of welding points. At the same time, the method of inserting and clamping the inclined blades and the straight blades through the upper and lower wheel discs eliminates the need for inserting and fixing, saves welding points, effectively avoids the risk of desoldering due to high-speed rotation, and is more stable. The center line of the inclined blade coincides with the axis line of the upper and lower wheel discs, with an angle of 0°, and the angle between the straight blade and the axis line of the upper and lower wheel discs is 18°.

[0031] In the embodiment of the present invention, the center of the lower wheel disc is provided with an embedding hole 10 for embedding the hub therein, and the center of the upper wheel disc is coaxially provided with a guide hole 11 for discharging the material, the diameter of the guide hole is larger than the embedding hole.

[0032] In the embodiment of the present invention, the inclined blades are all in a right-angled trapezoid to form a trumpet-shaped discharge channel 12 with a larger upper part and a smaller lower part to cooperate with the guide hole. The inclined side of the inclined blade is close to the inside and the upper bottom is connected to the upper wheel disc, the lower bottom is connected to the lower wheel disc, and the right-angled side is close to the outside. The upper and lower ends of the inclined blades are protruding with an inclined insertion protrusion 13 to facilitate insertion into the inclined slot. The length of the inclined insertion protrusion at the lower end of the inclined blade is less than the length of the lower bottom of the inclined blade so that the local lower bottom of the inclined blade can be connected to the upper end surface of the lower wheel disc to prevent it from falling out.

[0033] In an embodiment of the present invention, the size of the oblique insertion protrusion at the upper end of the oblique blade is smaller than the size of the oblique insertion protrusion at the lower end of the oblique blade, and the size of the oblique slot of the upper wheel disc is smaller than the size of the oblique slot of the lower wheel disc.

[0034] In the embodiment of the present invention, the straight blades are rectangular, and straight insertion protrusions 14 of the same size are fixedly provided at the upper and lower ends thereof.

[0035] In an embodiment of the present invention, the angle between the straight blade and the inclined blade in the same blade group is 18°.

[0036] The assembly principle of the embodiment of the utility model is as follows: first, weld the shaft sleeve and the hub to the lower wheel disc, then insert the lower end of the straight blade into the straight slot, and the lower end of the oblique blade into the oblique slot in turn, and then cover the upper wheel disc and align the straight protrusion and the oblique protrusion accordingly. After the insertion is completed, weld and fix them. It is only necessary to weld the oblique protrusion, the straight protrusion and the oblique slot and the straight slot to fix them. There are 40 oblique blades and 40 straight blades, which are less welded than the original many groups of blades. They are not easy to be desoldered. There are also oblique slots and straight slots for stable limiting, which is safer and more stable. When in use, the whole rotates counterclockwise, and the finer particles enter the discharge channel from the outside to the inside along the gaps between the blade groups, and are finally discharged from the guide hole.

[0037] The present invention is not limited to the above-mentioned preferred embodiment. Based on the inspiration of the present invention, anyone can derive other various types of folding blade fine screen grading wheel structures for ultrafine grinding mills. All equivalent changes and modifications made within the scope of the patent application of the present invention shall fall within the scope of the present invention.

Claims

1. The folding blade fine screen grading wheel structure of the ultrafine grinding mill is characterized by: It includes a coaxially arranged upper wheel disc and a lower wheel disc and a blade group evenly distributed in an annular shape between the upper wheel disc and the lower wheel disc. The blade group consists of inclined blades and straight blades connected to the side surfaces near the outer ends of the inclined blades. The upper wheel disc and the lower wheel disc are both provided with inclined slots for the upper and lower ends of the inclined blades to be inserted and fixed respectively. The sides of the inclined slots are correspondingly provided with straight slots for the straight blades to be inserted and fixed. A hub is coaxially fixed in the lower wheel disc.

2. The folding blade fine screen grading wheel structure of the ultrafine grinding mill according to claim 1 is characterized in that: The extending directions of the inclined blades are all coaxial with the upper wheel disc and the lower wheel disc, and the inclined blades are all evenly distributed at equal angles in a scattered manner.

3. The folding blade fine screen grading wheel structure of the ultrafine grinding mill according to claim 1 is characterized in that: The center of the lower wheel disc is provided with an embedding hole for embedding the wheel hub, and the center of the upper wheel disc is coaxially provided with a guide hole, the diameter of which is larger than the embedding hole.

4. The folding blade fine screen grading wheel structure of the ultrafine grinding mill according to claim 3, characterized in that: The inclined blades are all in a right-angled trapezoidal shape to form a trumpet-shaped discharge channel that is larger at the top and smaller at the bottom and matches the guide hole. The upper and lower ends of the inclined blades are protruding with inclined insertion protrusions to facilitate insertion into the inclined slots.

5. The folding blade fine screen grading wheel structure of the ultrafine grinding mill according to claim 4 is characterized in that: The size of the oblique insertion protrusion at the upper end of the oblique blade is smaller than the size of the oblique insertion protrusion at the lower end of the oblique blade, and the size of the oblique slot of the upper wheel disc is smaller than the size of the oblique slot of the lower wheel disc.

6. The folding blade fine screen grading wheel structure of the ultrafine grinding mill according to claim 1, characterized in that: The straight blades are rectangular, and straight insertion protrusions of the same size are fixedly provided at the upper and lower ends thereof.

7. The folding blade fine screen grading wheel structure of the ultrafine grinding mill according to claim 1, characterized in that: The included angle between the straight blade and the inclined blade in the same blade group is 18°.

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