Stirring knife sealing assembly for mixing machine with scraper

Abstract

The utility model provides a stirring knife sealing assembly with scrapers for a mixing machine, which comprises an upper sealing gland and a lower sealing cover which are arranged outside a stirring knife rotating shaft, the upper sealing gland is matched with the lower sealing cover in a stepped manner, and a plurality of scrapers are convexly arranged on the surface of the upper end surface of the lower sealing cover; according to the device, the scrapers are arranged between the upper sealing cover and the lower sealing cover to remove powder invading between the upper sealing cover and the lower sealing cover, and particularly, the scrapers are convexly arranged on the upper surface of the lower sealing cover rotating together with the rotating shaft of the stirring knife to scrape and throw out the invaded powder in the stirring process; potential safety hazards and mechanical faults caused by the fact that the powder invades between the sealing assemblies and is caked are further avoided; the structure is easy to produce and assemble and high in practicability.

Description

Technical Field

[0001] This utility model relates to the field of mixer technology, specifically a mixing blade sealing assembly for a mixer with a scraper. Background Technology

[0002] When mixing powders in a mixer, the mixing hopper loaded with the material rotates along the mixing shaft in the main frame. At the same time, during the rotation of the mixing hopper, the mixing blade component rotates at high speed along its own rotation axis. During the rotation, a large amount of powder is thrown into the air. The diffused dust may enter the rotating components, causing jamming or damage to the parts. Therefore, the sealing requirements for moving parts in a mixer are very strict.

[0003] The applicant has improved the design of the agitator blade sealing assembly for such powder mixers to provide better sealing and prevent powder from entering between the rotating components. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings and deficiencies of the existing technology and to provide a mixing blade sealing assembly with scrapers for mixers. The technical solution adopted by this utility model is as follows: A mixing blade sealing assembly with scrapers for mixers includes an upper sealing cover and a lower sealing cover disposed outside the rotating shaft of the mixing blade. The upper sealing cover and the lower sealing cover are fitted in a stepped manner, and a plurality of scrapers are protruding from the upper end surface of the lower sealing cover.

[0005] Preferably, the plurality of scrapers are arranged in a vortex on the upper end face of the lower sealing cover, with the axis O of the stirring blade shaft as the center. The angles α corresponding to the projections of the blade surfaces of the plurality of scrapers onto the stirring blade shaft are combined to cover at least 360°. To explain "cover at least 360°": with the axis O of the rotating shaft as the center, the plurality of scrapers are arranged in a vortex. The projection of the blade surface of each scraper onto the stirring blade shaft covers a certain arc. The arcs / angles corresponding to the plurality of scrapers are combined in sequence so that the arc projections of the plurality of scrapers onto the rotating shaft cover at least 360°, that is, the plurality of scrapers completely surround the rotating shaft.

[0006] Preferably, the arc ranges of adjacent scrapers at least partially overlap, and the arcs corresponding to the projections of the blade surfaces of several scrapers onto the rotating shaft of the stirring blade are greater than 360°.

[0007] Preferably, the scrapers are arc-shaped, with their blades facing the stirring blade axis, and the vortex of the arc-shaped scrapers arranged in a vortex pattern rotates in the opposite direction to the rotation direction of the stirring blade axis.

[0008] Preferably, the upper sealing cap includes a first stepped portion, and the lower sealing cap includes a second stepped portion and a scraping platform located on the upper surface of the outer end of the second stepped portion; the second stepped portion and the first stepped portion are fitted in a stepped manner, and the plurality of scrapers are disposed on the scraping platform.

[0009] Preferably, the second stepped portion includes a horizontal inclined surface and a vertical surface, the angle between the horizontal inclined surface and the vertical surface is an acute angle, and the horizontal inclined surface protrudes from the vertical surface in the direction close to the rotating shaft of the stirring blade, so that an outward convex portion is formed between the horizontal inclined surface and the vertical surface.

[0010] Preferably, a sealing adjustment block is also provided between the upper sealing cap and the lower sealing cap and the stirring blade shaft. The inner side of the upper sealing cap and the inner side of the lower sealing cap are close to the outer side of the sealing adjustment block. The sealing adjustment block is provided between the upper and lower sealing caps to adjust the axial gap between the upper and lower sealing channels.

[0011] Preferably, the upper sealing cap is connected to the bearing chamber of the stirring blade shaft, and the upper sealing cap remains stationary when the stirring blade shaft rotates. The sealing surface of the upper sealing cap has a labyrinth sealing structure; the labyrinth sealing structure refers to the labyrinth sealing structure in the prior art, and is not specifically limited here.

[0012] The beneficial effects of this utility model are as follows: This device has a scraper between the upper and lower sealing covers to remove powder that has invaded between the upper and lower sealing covers. Specifically, several scrapers are protruding from the upper surface of the lower sealing cover, which rotates together with the stirring blade shaft, to scrape off the powder that has invaded during the stirring process and throw it out, which further avoids the safety hazards and mechanical failures caused by powder invading and clumping between the sealing components; the above structure is easy to produce and assemble, and has strong practicality. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0014] Figure 1 This is a schematic diagram of the mixing blade assembly and hopper cover in Example 1.

[0015] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0016] Figure 3 This is a top view of the lower sealing cap of Example 1;

[0017] Figure 4This is a perspective view of the lower sealing cap of Example 1;

[0018] Figure 5 This is a cross-sectional view of the lower sealing cap of Example 1;

[0019] Figure 6 This is a schematic diagram of the mixer structure in Example 1;

[0020] In the figure, 1-stirring blade shaft, 2-upper sealing cap, 21-first step, 3-lower sealing cap, 31-scraper, 311-blade surface, 32-second step, 321-horizontal inclined surface, 322-outer protrusion, 323-vertical surface, 33-scraping platform, 4-sealing adjustment block, 5-hopper cover, 6-stirring blade assembly, 7-mixing hopper, 8-mixing rotating shaft. Detailed Implementation

[0021] To make the objectives, technical solutions and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings.

[0022] The directional and positional terms used in this utility model, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are merely for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0023] Example 1

[0024] like Figure 1-6 As shown, a mixer includes a hopper cover 5, a stirring blade assembly 6, a mixing hopper 7, and a mixing rotating shaft 8. In the stirring blade assembly, a mixer stirring blade sealing assembly with scrapers is adopted, including an upper sealing cover 2 and a lower sealing cover 3 disposed outside the stirring blade rotating shaft 1. The upper sealing cover 2 and the lower sealing cover 3 are fitted in a stepped manner, and a plurality of scrapers 31 are protruding from the upper end surface of the lower sealing cover 3.

[0025] The plurality of scrapers 31 are arranged in a vortex on the upper end face of the lower sealing cover 3, with the axis O of the stirring blade shaft 1 as the center, and the angle α corresponding to the projection of the blade surface 311 of the plurality of scrapers 31 onto the stirring blade shaft 1 is combined to cover at least 360°.

[0026] Further explanation of "covering at least 360°": See Appendix Figure 3 With the axis O of the rotating shaft as the center, several scrapers are arranged in a vortex. The projection of the blade surface of each scraper on the rotating shaft of the stirring blade corresponds to a certain arc. The arcs / angles corresponding to several scrapers are combined in sequence so that the arc projection of several scrapers on the rotating shaft covers at least 360°, that is, several scrapers completely surround the rotating shaft.

[0027] The arc ranges of adjacent scrapers 31 at least partially overlap, and the combined arc of the projections of the blade surfaces 311 of several scrapers 31 onto the stirring blade shaft 1 is greater than 360°; see attached figure. Figure 3 The arc α corresponding to the scraper is 63°, and the arc β corresponding to its adjacent scraper is also 63°. Thus, the six scrapers are evenly distributed on the upper surface of the lower sealing cover 3, and the corresponding arcs are combined to be greater than 360°. Furthermore, α and β partially overlap to ensure the scraping effect.

[0028] The plurality of scrapers 31 are arc-shaped, with their blade surfaces 311 facing the stirring blade shaft 1, and the vortex of the plurality of arc-shaped scrapers 31 arranged in a vortex pattern rotating in the opposite direction to the rotation direction of the stirring blade shaft 1; see attached figure. Figure 3 It can be seen that several scrapers 31 are arranged in a vortex from the outside to the inside and from left to right, that is, the vortex rotates clockwise. Therefore, the stirring blade shaft rotates counterclockwise, which drives the upper sealing cover 2 to rotate. This causes several scrapers to rotate counterclockwise relative to the stationary upper sealing cover 2. During the rotation, the blade surface 32 just meets the powder that has invaded between the upper sealing cover 2 and the lower sealing cover 3 to scrape it off.

[0029] The upper sealing cap 2 includes a first stepped portion 21, and the lower sealing cap 3 includes a second stepped portion 32 and a scraping platform 33 located on the upper surface of the outer end of the second stepped portion 32; the second stepped portion 32 is in step-like cooperation with the first stepped portion 21, and the plurality of scrapers 31 are disposed on the scraping platform 33.

[0030] The second stepped portion 32 includes a horizontal inclined surface 321 and a vertical surface 323. The angle between the horizontal inclined surface 321 and the vertical surface 323 is an acute angle, and the horizontal inclined surface 321 protrudes from the vertical surface 323 in the direction close to the stirring blade shaft 1, so that an outward protrusion 322 is formed between the horizontal inclined surface 321 and the vertical surface 323.

[0031] A sealing adjustment block 4 is also provided between the upper sealing cap 2 and the lower sealing cap 3 and the stirring blade shaft 1. The inner side of the upper sealing cap 2 and the inner side of the lower sealing cap 3 are close to the outer side of the sealing adjustment block 4. In this embodiment, the vertical surface of the lowest step of the lower sealing cap 3 is close to the outer side of the sealing adjustment block 4.

[0032] The upper sealing cap 2 is connected to the bearing chamber of the stirring blade shaft 1, and the upper sealing cap 2 remains stationary when the stirring blade shaft 1 rotates. The sealing surface of the upper sealing cap 2 has a labyrinth sealing structure; the labyrinth sealing structure refers to the labyrinth sealing structure in the prior art, and is not specifically limited here.

[0033] In this device, the upper sealing cover serves as a relatively stationary part between the bearing chamber and the sealing channel, the sealing adjustment block serves as a pad for adjusting the axial clearance between the upper and lower sealing channels, and the upper end face of the lower sealing cover has six scrapers. The arc protrusion direction of the scrapers (counterclockwise in this embodiment) is consistent with the rotation direction of the motor. When powder enters, it can throw out the powder clamped on the upper and lower sealing end faces, preventing the powder from clumping and deteriorating. The above structure is ingenious, easy to process and assemble, and reliable in operation; the main structure basically adopts an easy-to-assemble structure, which is convenient for disassembly, installation, and maintenance.

[0034] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A mixing blade sealing assembly for a mixer with a scraper, comprising an upper sealing cap (2) and a lower sealing cap (3) disposed outside the mixing blade rotating shaft (1), characterized in that: The upper sealing cap (2) and the lower sealing cap (3) are fitted in a stepped manner, and several scrapers (31) are provided on the upper end surface of the lower sealing cap (3).

2. The mixing blade sealing assembly for a mixer with a scraper according to claim 1, characterized in that: The plurality of scrapers (31) are arranged in a vortex on the upper end face of the lower sealing cover (3), with the axis O of the stirring blade shaft (1) as the center, and the angle α corresponding to the projection of the blade surface (311) of the plurality of scrapers (31) on the stirring blade shaft (1) covers at least 360°.

3. The mixing blade sealing assembly for a mixer with a scraper according to claim 2, characterized in that: The arc ranges corresponding to adjacent scrapers (31) at least partially overlap, and the arcs corresponding to the projections of the blade surfaces (311) of several scrapers (31) onto the stirring blade shaft (1) are greater than 360°.

4. The mixing blade sealing assembly for a mixer with a scraper according to claim 1, characterized in that: The plurality of scrapers (31) are arc-shaped, with the blade surface (311) of the plurality of scrapers (31) facing the stirring blade shaft (1), and the vortex rotation direction of the plurality of arc-shaped scrapers (31) arranged in a vortex is opposite to the rotation direction of the stirring blade shaft (1).

5. A mixing blade sealing assembly for a mixer with a scraper according to claim 1, characterized in that: The upper sealing cap (2) includes a first stepped portion (21), and the lower sealing cap (3) includes a second stepped portion (32) and a scraping platform (33) located on the upper surface of the outer end of the second stepped portion (32); the second stepped portion (32) is steppedly engaged with the first stepped portion (21), and the plurality of scrapers (31) are disposed on the scraping platform (33).

6. A mixing blade sealing assembly for a mixer with a scraper according to claim 5, characterized in that: The second step (32) includes a horizontal inclined surface (321) and a vertical surface (323). The angle between the horizontal inclined surface (321) and the vertical surface (323) is an acute angle, and the horizontal inclined surface (321) protrudes from the vertical surface (323) in the direction close to the stirring blade shaft (1), so that an outward protrusion (322) is formed between the horizontal inclined surface (321) and the vertical surface (323).

7. A mixing blade sealing assembly for a mixer with a scraper according to claim 1, characterized in that: A sealing adjustment block (4) is also provided between the upper sealing cap (2) and the lower sealing cap (3) and the stirring blade shaft (1), and the inner side of the upper sealing cap (2) and the inner side of the lower sealing cap (3) are close to the outer side of the sealing adjustment block (4).

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