Discharging and screening device of rotary kiln

Abstract

The invention discloses a rotary kiln discharge screening device, which is used for coarse and fine screening of discharge materials of a rotary kiln, and comprises a conical screen structure rotating around the horizontal center line of a movable cylinder, and a fine material discharge port and a coarse material discharge port which are arranged at the lower part of a static cylinder; the conical screen structure is arranged on the outer side of the annular plate on the outer side of the movable cylinder, when the rotary kiln runs, the conical screen rotates around the horizontal center line of the movable cylinder, and dynamic screening of discharging materials of the rotary kiln is achieved; the conical screen spiral blades are intermittently welded to the inner side of the conical screen, so that fine materials discharged by the rotary kiln are evenly screened out at the fan ring opening of the conical screen, and coarse materials discharged by the rotary kiln are smoothly and stably screened out at an outlet in the right portion of the conical screen; through the special structural design of the fan ring base plate of the conical screen, the change of the shape of the cross section of the screen is kept continuous, the thermal stress concentration area is reduced, meanwhile, thermal expansion displacement is fully considered in the design of the screen, and long-time stable screening of discharged materials of the rotary kiln at the high temperature of 1050 DEG C is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of rotary kilns, and in particular to a rotary kiln discharge screening device. Background Art

[0002] The rotary kiln is an industrial equipment for heat treatment of materials. Due to the different characteristics of materials, the powdered feed materials may agglomerate after heat treatment, resulting in blocky discharge materials, which will block the subsequent equipment at the discharge end of the rotary kiln. Under this working condition, the coarse and fine screening of the rotary kiln discharge materials is the key point for the continuous and stable operation of the production line.

[0003] The screening device for the rotary kiln discharge, the main traditional screening measure is to add a fixed screen at the discharge end. Prior art CN219572627U discloses a screening discharge pipe of a rotary kiln, which realizes the screening of fine and coarse materials by connecting two levels of screen pipes at the bottom of the rotary kiln discharge cover; Prior art CN219934613U discloses a rotary kiln discharge bin with screening function, which realizes the screening of fine and coarse materials by setting two layers of cross-arranged screens in the rotary kiln discharge cover. This traditional screening method of adding a screen may have disadvantages such as coarse material clogging due to the reasons such as the non-fixed repose angle of the coarse material (the coarse material is not a regular sphere and has a non-fixed shape), the small setting angle of the screen, the stationary screen, and the coarse material falling only depends on its own gravity.

[0004] Therefore, in view of the above problems, the present invention provides a rotary kiln discharge screening device. Summary of the invention

[0005] The purpose of the present invention is to provide a rotary kiln discharge screening device to fill the gap in the current technology.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A rotary kiln discharge screening device, the rotary kiln discharge screening device is a coarse and fine screening device for the discharge material of the rotary kiln, the rotary kiln comprises a sleeved moving cylinder (11) and a stationary cylinder (21);

[0008] The movable cylinder (11) comprises a movable cylinder outer cylinder body (111), a movable cylinder inner cylinder body (112), a movable cylinder inner ring plate (113), and a movable cylinder outer ring plate (114); the interior of the movable cylinder (11) is filled with a movable cylinder inner heat insulation material (12); the inner side of the movable cylinder inner cylinder body (112) is intermittently welded with movable cylinder spiral blades (13); the outer side of the movable cylinder outer cylinder body (111) is sleeved with a movable cylinder end face sealing structure; the movable cylinder end face sealing structure comprises a movable ring (14) sleeved at the end of the movable cylinder (11), a movable wear-resistant ring (15), a movable wear-resistant ring clamping flange (16), and a movable ring fastener (17); the movable wear-resistant ring (15) is fastened to the movable ring (14) by the movable wear-resistant ring clamping flange (16) and the movable ring fastener (17);

[0009] The static cylinder (21) comprises a main static cylinder (211), a fine material discharge port (212) and a coarse material discharge port (214) arranged at the lower part of the static cylinder (21); a fine material discharge port flange (213) is arranged at the lower part of the fine material discharge port (212); a coarse material discharge port flange (215) is arranged at the lower part of the coarse material discharge port (214); a static cylinder end face sealing structure is sleeved on the outer side of the static cylinder (21); the static cylinder end face sealing structure comprises a static ring (22) sleeved at the end of the static cylinder (21), a static wear-resistant ring (23), a static wear-resistant ring clamping flange (24) and a static ring fastener (25); the static wear-resistant ring (23) is fastened to the static ring (22) by the static wear-resistant ring clamping flange (24) and the static ring fastener (25);

[0010] A conical screen structure (31) is arranged outside the outer annular plate (114) of the moving cylinder. The conical screen structure (31) comprises a conical screen flange (311), a conical screen (312) and conical screen spiral blades (313). The conical screen (312) is formed by rolling a conical screen fan ring base plate (3121) after opening holes. The conical screen flange (311) is sleeved on the outer side of the conical screen (312) at a large diameter. The conical screen spiral blades (313) are intermittently welded on the inner side of the conical screen (312). The conical screen structure (31) is fastened to the outer side of the outer annular plate (114) of the moving cylinder by a conical screen fastener (32).

[0011] The outer radius of the conical screen fan ring base plate (3121) is 2695 mm, the inner radius is 2049 mm, and the center angle is 44°; the conical screen fan ring base plate (3121) includes conical screen fan ring openings (3122), and there are 1389 conical screen fan ring openings (3122). The conical screen fan ring openings (3122) have a diameter of 20 mm, are arranged in an equilateral triangle, and the center distance between adjacent openings is 30 mm;

[0012] The conical screen (312) is arranged above the fine material discharge port (212) and the coarse material discharge port (214); the lower part of the conical screen fan ring opening (3122) is the fine material discharge port (212); and the lower part of the right discharge port of the conical screen (312) is the coarse material discharge port (214).

[0013] Preferably, when the rotary kiln is in operation, the outer cylinder body (111) of the moving cylinder, the inner cylinder body (112) of the moving cylinder, the inner annular plate (113) of the moving cylinder, the outer annular plate (114) of the moving cylinder, the heat insulation material (12) inside the moving cylinder, the spiral blades (13) of the moving cylinder, the moving ring (14), the moving wear-resistant ring (15), the moving wear-resistant ring clamping flange (16), the moving ring fastener (17), the conical screen flange (311), the conical screen fastener (32), the conical screen (312), and the conical screen spiral blades (313) rotate around the horizontal center line of the moving cylinder (11).

[0014] Preferably, when the rotary kiln is in operation, the stationary cylinder (21), the fine material discharge port (212), the fine material discharge port flange (213), the coarse material discharge port (214), the coarse material discharge port flange (215), the stationary ring (22), the stationary wear-resistant ring (23), the stationary wear-resistant ring clamping flange (24), and the stationary ring fastener (25) are stationary.

[0015] Preferably, when the rotary kiln is in operation, the spiral blades (13) of the moving cylinder rotate around the horizontal center line of the moving cylinder (11), and at the same time, the spiral blades (13) of the moving cylinder transport the discharged material of the rotary kiln to the right.

[0016] Preferably, when the rotary kiln is in operation, the conical screen spiral blades (313) rotate around the horizontal center line of the moving cylinder (11), and at the same time, the conical screen spiral blades (313) transport the material discharged from the rotary kiln to the right.

[0017] Preferably, when the rotary kiln is in operation, the conical screen (312) rotates around the horizontal center line of the moving cylinder (11), and at the same time, the conical screen (312) screens the material discharged from the rotary kiln into coarse and fine screens;

[0018] When the discharge material is less than 20 mm, the discharge material passes through the conical screen ring opening (3122) and falls into the fine material discharge port (212);

[0019] When the discharge material is ≥20 mm, the discharge material passes through the right discharge port of the conical screen (312) and falls into the coarse material discharge port (214).

[0020] Due to the application of the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0021] 1. The present invention arranges a conical screen structure on the outer side of the annular plate on the outer side of the moving cylinder. When the rotary kiln is running, the conical screen rotates around the horizontal center line of the moving cylinder to achieve dynamic screening of the discharged materials of the rotary kiln, thereby avoiding the problem of material blocking the sieve holes caused by the static screen and the unfixed repose angle of the coarse material in the traditional screening method, thereby enhancing the screening effect and accuracy.

[0022] 2. The present invention intermittently welds the spiral blades of the conical screen inside the conical screen, utilizes the rightward thrust of the spiral blades of the conical screen, guides the material to flow smoothly on the screen surface, reduces the accumulation and retention of the material, and at the same time, the spiral blades can produce a certain stirring and dispersing effect on the material during the rotation process, so that the relative movement between the materials is increased, the contact opportunity between the materials and the screen holes is promoted, the screening efficiency is improved, and the fine materials discharged from the rotary kiln are evenly screened out at the opening of the conical screen fan ring and the coarse materials discharged from the rotary kiln with different repose angles are smoothly and stably screened out at the right outlet of the conical screen;

[0023] 3. The present invention uses the special structural design of the conical screen fan ring base plate to maintain the continuity of the change in the cross-sectional shape of the screen and reduce the area of ​​thermal stress concentration. At the same time, the design of the screen opening size and distribution fully considers the thermal expansion displacement under high temperature, which can achieve long-term stable screening of rotary kiln discharge materials in a high temperature environment of 1050°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, some of the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be made based on these drawings without paying any creative work.

[0025] Figure 1 is a cross-sectional view of a rotary kiln discharge screening device according to embodiment 1 of the present invention;

[0026] Figure 2 1 is an expanded view of a conical screen of a rotary kiln discharge screening device according to embodiment 1 of the present invention;

[0027] Among them, 11, moving cylinder; 111, outer cylinder of moving cylinder; 112, inner cylinder of moving cylinder; 113, inner annular plate of moving cylinder; 114, outer annular plate of moving cylinder; 12, thermal insulation material in moving cylinder; 13, spiral blade of moving cylinder; 14, moving ring; 15, moving wear-resistant ring; 16, pressing flange of moving wear-resistant ring; 17, fastener of moving ring; 21, stationary cylinder; 211, main body of stationary cylinder; 212, outlet of fine material; 213, fine material Material discharge port flange; 214, coarse material discharge port; 215, coarse material discharge port flange; 22, static ring; 23, static wear-resistant ring; 24, static wear-resistant ring clamping flange; 25, static ring fasteners; 31, conical screen structure; 311, conical screen flange; 312, conical screen; 3121, conical screen fan ring base plate; 3122, conical screen fan ring opening; 313, conical screen spiral blades; 32, conical screen fasteners. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0029] Example 1

[0030] See attached Figure 1 And attached Figure 2 This embodiment provides a rotary kiln discharge screening device, which is a coarse and fine screening device for the discharge material of the rotary kiln. The rotary kiln comprises a sleeve-connected moving cylinder (11) and a stationary cylinder (21);

[0031] The movable cylinder (11) comprises a movable cylinder outer cylinder body (111), a movable cylinder inner cylinder body (112), a movable cylinder inner ring plate (113), and a movable cylinder outer ring plate (114); the interior of the movable cylinder (11) is filled with a movable cylinder inner heat insulation material (12); the inner side of the movable cylinder inner cylinder body (112) is intermittently welded with movable cylinder spiral blades (13); the outer side of the movable cylinder outer cylinder body (111) is sleeved with a movable cylinder end face sealing structure; the movable cylinder end face sealing structure comprises a movable ring (14) sleeved at the end of the movable cylinder (11), a movable wear-resistant ring (15), a movable wear-resistant ring clamping flange (16), and a movable ring fastener (17); the movable wear-resistant ring (15) is fastened to the movable ring (14) by the movable wear-resistant ring clamping flange (16) and the movable ring fastener (17);

[0032] The static cylinder (21) comprises a main static cylinder (211), a fine material discharge port (212) and a coarse material discharge port (214) arranged at the lower part of the static cylinder (21); a fine material discharge port flange (213) is arranged at the lower part of the fine material discharge port (212); a coarse material discharge port flange (215) is arranged at the lower part of the coarse material discharge port (214); a static cylinder end face sealing structure is sleeved on the outer side of the static cylinder (21); the static cylinder end face sealing structure comprises a static ring (22) sleeved at the end of the static cylinder (21), a static wear-resistant ring (23), a static wear-resistant ring clamping flange (24) and a static ring fastener (25); the static wear-resistant ring (23) is fastened to the static ring (22) by the static wear-resistant ring clamping flange (24) and the static ring fastener (25);

[0033] A conical screen structure (31) is arranged outside the outer annular plate (114) of the moving cylinder. The conical screen structure (31) comprises a conical screen flange (311), a conical screen (312) and conical screen spiral blades (313). The conical screen (312) is formed by rolling a conical screen fan ring base plate (3121) after opening holes. The conical screen flange (311) is sleeved on the outer side of the conical screen (312) at a large diameter. The conical screen spiral blades (313) are intermittently welded on the inner side of the conical screen (312). The conical screen structure (31) is fastened to the outer side of the outer annular plate (114) of the moving cylinder by a conical screen fastener (32).

[0034] The outer radius of the conical screen fan ring base plate (3121) is 2695 mm, the inner radius is 2049 mm, and the center angle is 44°; the conical screen fan ring base plate (3121) includes conical screen fan ring openings (3122), and there are 1389 conical screen fan ring openings (3122). The conical screen fan ring openings (3122) have a diameter of 20 mm and are arranged in an equilateral triangle, and the center distance between adjacent openings is 30 mm;

[0035] The conical screen (312) is arranged above the fine material discharge port (212) and the coarse material discharge port (214); the lower part of the conical screen fan ring opening (3122) is the fine material discharge port (212); and the lower part of the right discharge port of the conical screen (312) is the coarse material discharge port (214);

[0036] Furthermore, when the rotary kiln is in operation, the outer cylinder body (111) of the moving cylinder, the inner cylinder body (112) of the moving cylinder, the inner annular plate (113) of the moving cylinder, the outer annular plate (114) of the moving cylinder, the heat insulation material (12) inside the moving cylinder, the spiral blades (13) of the moving cylinder, the moving ring (14), the moving wear-resistant ring (15), the moving wear-resistant ring clamping flange (16), the moving ring fastener (17), the conical screen flange (311), the conical screen fastener (32), the conical screen (312), and the conical screen spiral blades (313) rotate around the horizontal center line of the moving cylinder (11);

[0037] Furthermore, when the rotary kiln is in operation, the stationary cylinder (21), the fine material discharge port (212), the fine material discharge port flange (213), the coarse material discharge port (214), the coarse material discharge port flange (215), the stationary ring (22), the stationary wear-resistant ring (23), the stationary wear-resistant ring clamping flange (24), and the stationary ring fastener (25) are stationary;

[0038] Furthermore, when the rotary kiln is in operation, the spiral blades (13) of the moving cylinder rotate around the horizontal center line of the moving cylinder (11), and at the same time, the spiral blades (13) of the moving cylinder transport the discharged material of the rotary kiln to the right.

[0039] Furthermore, when the rotary kiln is in operation, the conical screen spiral blade (313) rotates around the horizontal center line of the moving cylinder (11), and at the same time, the conical screen spiral blade (313) transports the material discharged from the rotary kiln to the right;

[0040] Furthermore, when the rotary kiln is in operation, the conical screen (312) rotates around the horizontal center line of the moving cylinder (11), and at the same time, the conical screen (312) screens the material discharged from the rotary kiln into coarse and fine categories;

[0041] When the discharge material is less than 20 mm, the discharge material passes through the conical screen ring opening (3122) and falls into the fine material discharge port (212);

[0042] When the discharge material is ≥20 mm, the discharge material passes through the right discharge port of the conical screen (312) and falls into the coarse material discharge port (214).

[0043] In summary, the present invention arranges a conical screen structure on the outer side of the annular plate on the outer side of the moving cylinder. When the rotary kiln is running, the conical screen rotates around the horizontal center line of the moving cylinder to achieve dynamic screening of the material discharged from the rotary kiln; the present invention intermittently welds conical screen spiral blades on the inner side of the conical screen, utilizes the rightward thrust of the conical screen spiral blades, achieves uniform screening of fine material discharged from the rotary kiln at the opening of the conical screen fan ring, and simultaneously achieves smooth and stable screening of coarse material discharged from the rotary kiln with different repose angles at the right outlet of the conical screen.

[0044] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0045] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0046] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0047] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] The above-mentioned embodiment only expresses one implementation mode of the present invention, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A rotary kiln discharge screening device, characterized in that: The rotary kiln discharge screening device is a coarse and fine screening device for the discharge material of the rotary kiln, and the rotary kiln comprises a sleeve-connected moving cylinder (11) and a stationary cylinder (21); The movable cylinder (11) comprises a movable cylinder outer cylinder body (111), a movable cylinder inner cylinder body (112), a movable cylinder inner ring plate (113), and a movable cylinder outer ring plate (114); the interior of the movable cylinder (11) is filled with a movable cylinder inner heat insulation material (12); the inner side of the movable cylinder inner cylinder body (112) is intermittently welded with movable cylinder spiral blades (13); the outer side of the movable cylinder outer cylinder body (111) is sleeved with a movable cylinder end face sealing structure; the movable cylinder end face sealing structure comprises a movable ring (14) sleeved at the end of the movable cylinder (11), a movable wear-resistant ring (15), a movable wear-resistant ring clamping flange (16), and a movable ring fastener (17); the movable wear-resistant ring (15) is fastened to the movable ring (14) by the movable wear-resistant ring clamping flange (16) and the movable ring fastener (17); The static cylinder (21) comprises a main static cylinder (211), a fine material discharge port (212) and a coarse material discharge port (214) arranged at the lower part of the static cylinder (21); a fine material discharge port flange (213) is arranged at the lower part of the fine material discharge port (212); a coarse material discharge port flange (215) is arranged at the lower part of the coarse material discharge port (214); a static cylinder end face sealing structure is sleeved on the outer side of the static cylinder (21); the static cylinder end face sealing structure comprises a static ring (22) sleeved at the end of the static cylinder (21), a static wear-resistant ring (23), a static wear-resistant ring clamping flange (24) and a static ring fastener (25); the static wear-resistant ring (23) is fastened to the static ring (22) by the static wear-resistant ring clamping flange (24) and the static ring fastener (25); A conical screen structure (31) is arranged outside the outer annular plate (114) of the moving cylinder. The conical screen structure (31) comprises a conical screen flange (311), a conical screen (312) and conical screen spiral blades (313). The conical screen (312) is formed by rolling a conical screen fan ring base plate (3121) after opening holes. The conical screen flange (311) is sleeved on the outer side of the conical screen (312) at a large diameter. The conical screen spiral blades (313) are intermittently welded on the inner side of the conical screen (312). The conical screen structure (31) is fastened to the outer side of the outer annular plate (114) of the moving cylinder by a conical screen fastener (32). The outer radius of the conical screen fan ring base plate (3121) is 2695 mm, the inner radius is 2049 mm, and the center angle is 44°; the conical screen fan ring base plate (3121) includes conical screen fan ring openings (3122), and there are 1389 conical screen fan ring openings (3122). The conical screen fan ring openings (3122) have a diameter of 20 mm, are arranged in an equilateral triangle, and the center distance between adjacent openings is 30 mm; The conical screen (312) is arranged above the fine material discharge port (212) and the coarse material discharge port (214); the lower part of the conical screen fan ring opening (3122) is the fine material discharge port (212); and the lower part of the right discharge port of the conical screen (312) is the coarse material discharge port (214).

2. The rotary kiln discharge screening device according to claim 1, characterized in that: When the rotary kiln is in operation, the outer cylinder body (111) of the moving cylinder, the inner cylinder body (112) of the moving cylinder, the inner annular plate (113) of the moving cylinder, the outer annular plate (114) of the moving cylinder, the heat insulation material (12) inside the moving cylinder, the spiral blades (13) of the moving cylinder, the moving ring (14), the moving wear-resistant ring (15), the moving wear-resistant ring clamping flange (16), the moving ring fastener (17), the conical screen flange (311), the conical screen fastener (32), the conical screen (312), and the conical screen spiral blades (313) rotate around the horizontal center line of the moving cylinder (11).

3. The rotary kiln discharging screening device according to claim 1, characterized in that: When the rotary kiln is in operation, the stationary cylinder (21), the fine material discharge port (212), the fine material discharge port flange (213), the coarse material discharge port (214), the coarse material discharge port flange (215), the stationary ring (22), the stationary wear-resistant ring (23), the stationary wear-resistant ring clamping flange (24), and the stationary ring fastener (25) are stationary.

4. The rotary kiln discharge screening device according to claim 1, characterized in that: When the rotary kiln is in operation, the moving cylinder spiral blades (13) rotate around the horizontal center line of the moving cylinder (11), and at the same time, the moving cylinder spiral blades (13) transport the discharged material of the rotary kiln to the right.

5. The rotary kiln discharge screening device according to claim 1, characterized in that: When the rotary kiln is in operation, the conical screen spiral blades (313) rotate around the horizontal center line of the moving cylinder (11), and at the same time, the conical screen spiral blades (313) transport the discharged materials of the rotary kiln to the right.

6. The rotary kiln discharge screening device according to claim 1, characterized in that: When the rotary kiln is in operation, the conical screen (312) rotates around the horizontal center line of the moving cylinder (11), and at the same time, the conical screen (312) performs coarse and fine screening on the material discharged from the rotary kiln; When the discharge material is less than 20 mm, the discharge material passes through the conical screen ring opening (3122) and falls into the fine material discharge port (212); When the discharge material is ≥20 mm, the discharge material passes through the right discharge port of the conical screen (312) and falls into the coarse material discharge port (214).

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