Feeding screw for rotary kiln

Abstract

The utility model relates to the field of material conveying equipment, and discloses a feeding screw for a rotary kiln, which comprises a motor, a columnar shell and a main shaft, the motor is fixed outside the shell, the feeding end of the shell is fixed outside the rotary kiln, the discharging end of the shell is inserted into the rotary kiln, the main shaft is rotatably mounted in the shell, and the main shaft is fixedly connected with the shell. A rotating shaft of the motor is connected with a power input end of the main shaft through a coupler, a spiral blade is fixed on the main shaft positioned in the shell, a power output end of the main shaft is connected with the shell through a sliding bearing seat, and a discharge hole of the shell is formed between the spiral blade and the sliding bearing seat. The utility model has the beneficial effects that the sliding bearing seat is arranged between the power output end of the main shaft and the shell, so that the power output end of the main shaft is supported to form a whole with the shell, the installation difficulty is reduced, the risk of shaft breakage is reduced, and the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of material conveying equipment, and in particular to a feeding screw for a rotary kiln. Background Technology

[0002] Rotary kilns are widely used in many production industries such as building materials, metallurgy, chemicals, and environmental protection. These rotary cylindrical devices are used to mechanically, physically, or chemically process solid materials. As a multi-functional piece of equipment, rotary kilns are widely used in chemical production fields such as pyrolysis, drying, roasting, and granulation. A rotary kiln generally consists of a rotating cylinder within which materials are stirred, mixed, and / or flowed, ensuring uniform heating and complete volatilization of components.

[0003] Chinese utility model patent (authorization announcement number: CN221198004U, title: A self-preheating reciprocating rotary kiln) includes a rotary kiln shell and a feeding auger shell. One end of the rotary kiln shell with a material inlet / outlet hood is designated as the first end, and the other end as the second end. The rotary kiln shell rotates under the drive of a shell driving device. A concentric feeding auger shell is located within the rotary kiln shell. Inside the feeding auger shell is a spiral feeding shaft, which rotates under the drive of a feeding driving device. External rotating blades are located on the outer side of the feeding auger shell; the material can be conveyed from the second end to the first end of the rotary kiln shell through the relative rotation of the external rotating blades and the rotary kiln shell. It can preheat the material in the feed auger cylinder by using the high temperature protective gas in the rotary kiln cylinder while completing the feeding process. It can make full use of the heat of the high temperature gas and solve the problems of high cost and large footprint of independent preheating equipment. However, the feed screw discharges from the front end, and the front end of the main shaft is suspended. The harsh working environment and high temperature and highly corrosive powder cause the main shaft to break and need to be replaced in a short period of time. Utility Model Content

[0004] The purpose of this invention is to provide a feed screw for a rotary kiln to overcome the shortcomings of the prior art.

[0005] The objective of this utility model is achieved through the following technical solution: a feeding screw for a rotary kiln, comprising a motor, a cylindrical housing, and a main shaft. The motor is fixed outside the housing, the feeding end of the housing is fixed outside the rotary kiln, the discharge end of the housing is inserted into the rotary kiln, the main shaft is rotatably mounted inside the housing, the motor shaft is connected to the power input end of the main shaft via a coupling, spiral blades are fixed on the main shaft located inside the housing, the power output end of the main shaft is connected to the housing via a sliding bearing seat, and the discharge port of the housing is opened between the spiral blades and the sliding bearing seat.

[0006] Preferably, the power input end of the main shaft is rotatably connected to the housing via a thrust tapered roller bearing, the thrust tapered roller bearing is fixed outside the housing via a bearing housing, and the bearing housing is sealed with a skeleton oil seal.

[0007] Preferably, the main shaft is a hollow shaft, and a plurality of evenly distributed exhaust holes are opened on the main shaft located inside the housing, and an air inlet is opened on the main shaft located outside the housing. A bushing is fitted on the main shaft, and the air inlet is located inside the bushing. The gap between the bushing and the main shaft is sealed by a packing seal ring, and an air inlet pipe communicating with the air inlet is fixed on the bushing.

[0008] Preferably, the angle between the exhaust port and the axis of the main shaft is an acute angle, and the acute angle faces away from the motor.

[0009] Preferably, a wear-resistant material layer is welded to the feeding working surface of the spiral blade, and the wear-resistant material layer is made of 85 steel.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0011] A sliding bearing seat is installed between the power output end of the main shaft and the housing, so that the power output end of the main shaft is supported and forms an integral part with the housing. The discharge port is moved from the end of the housing to the side wall, which reduces the risk of shaft breakage and extends service life. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle;

[0014] Figure 3 for Figure 1 A magnified view of a portion of point B in the middle;

[0015] In the diagram, 1-motor, 2-housing, 3-main shaft, 4-helical blade, 5-sliding bearing seat, 6-thrust tapered roller bearing, 7-bearing box, 8-exhaust port, 9-inlet port, 10-shaft sleeve, 11-packing seal, 12-inlet pipe. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0017] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0018] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0019] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0020] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0021] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] like Figure 1 and3 As shown, a feeding screw for a rotary kiln includes a motor 1, a cylindrical housing 2, and a main shaft 3. The motor 1 is fixed outside the housing 2, the feeding end of the housing 2 is fixed outside the rotary kiln, and the discharge end of the housing 2 is inserted into the rotary kiln. The main shaft 3 is rotatably installed inside the housing 2. The shaft of the motor 1 is connected to the power input end of the main shaft 3 through a coupling. Spiral blades 4 are fixed on the main shaft 3 located inside the housing 2. The power output end of the main shaft 3 is connected to the housing 2 through a sliding bearing seat 5. The sliding bearing seat 5 is fixed inside the housing 2 by bolts. The discharge port of the housing 2 is opened between the spiral blades 4 and the sliding bearing seat 5. The sliding bearing seat 5 is set between the power output end of the main shaft 3 and the housing 2, so that the power output end of the main shaft 3 is supported and forms an integral part with the housing 2. The discharge port is changed from the end of the housing 2 to the side wall, which reduces the risk of shaft breakage and extends the service life.

[0023] In this embodiment, as Figure 1 and 2 As shown, the power input end of the main shaft 3 is rotatably connected to the housing 2 through the thrust tapered roller bearing 6. The thrust tapered roller bearing 6 is fixed outside the housing 2 through the bearing box 7. The bearing box 7 seals the thrust tapered roller bearing 6 through the skeleton oil seal to prevent material from leaking from the thrust tapered roller bearing 6 and causing material waste.

[0024] In this embodiment, as Figure 1-3 As shown, the spindle 3 is a hollow shaft. Several evenly distributed exhaust holes 8 are opened on the spindle 3 located inside the housing 2, and an air inlet hole 9 is opened on the spindle 3 located outside the housing 2. A bushing 10 is fitted on the spindle 3, and the air inlet hole 9 is located inside the bushing 10. The gap between the bushing 10 and the spindle 3 is sealed by a packing seal ring 11. An air inlet pipe 12 communicating with the air inlet hole 9 is fixed on the bushing 10. The introduction of air can cool the spindle 3, improve the working environment of the spindle 3, and increase the service life of the spindle 3.

[0025] In this embodiment, as Figure 1 and 2 As shown, the angle between the exhaust port 8 and the axis of the main shaft 3 is an acute angle, with the acute angle facing away from the motor 1. This helps to blow the material towards the discharge port and reduce the feeding pressure of the spiral blade 4.

[0026] In this embodiment, as Figure 1-3 As shown, a wear-resistant material layer is welded onto the feeding working surface of the spiral blade 4. The wear-resistant material layer is made of 85 steel. Through holes are opened on the spiral blade 4. Then, the 85 steel plate is made into a spiral shape and attached to the spiral blade 4. Welding material is heated into the through holes and then the welding material is melted to weld the 85 steel plate onto the spiral blade 4, so that the spiral blade 4 has strong wear resistance and extends its service life.

[0027] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A feed screw for a rotary kiln, comprising a motor (1), a cylindrical housing (2), and a main shaft (3), wherein the motor (1) is fixed outside the housing (2), the feed end of the housing (2) is fixed outside the rotary kiln, the discharge end of the housing (2) is inserted into the rotary kiln, the main shaft (3) is rotatably mounted inside the housing (2), the shaft of the motor (1) is connected to the power input end of the main shaft (3) via a coupling, and helical blades (4) are fixed on the main shaft (3) located inside the housing (2), characterized in that: The power output end of the main shaft (3) is connected to the housing (2) through the sliding bearing seat (5), and the discharge port of the housing (2) is opened between the spiral blade (4) and the sliding bearing seat (5).

2. The feed screw for a rotary kiln according to claim 1, characterized in that: The power input end of the main shaft (3) is rotatably connected to the housing (2) through a thrust tapered roller bearing (6). The thrust tapered roller bearing (6) is fixed outside the housing (2) through a bearing box (7). The bearing box (7) seals the thrust tapered roller bearing (6) through a skeleton oil seal.

3. The feed screw for a rotary kiln according to claim 1, characterized in that: The main shaft (3) is a hollow shaft. Several evenly distributed exhaust holes (8) are opened on the main shaft (3) located inside the housing (2). An air inlet hole (9) is opened on the main shaft (3) located outside the housing (2). A bushing (10) is fitted on the main shaft (3). The air inlet hole (9) is located inside the bushing (10). The gap between the bushing (10) and the main shaft (3) is sealed by a packing seal (11). An air inlet pipe (12) communicating with the air inlet hole (9) is fixed on the bushing (10).

4. A feed screw for a rotary kiln according to claim 3, characterized in that: The angle between the exhaust port (8) and the axis of the main shaft (3) is an acute angle, and the acute angle is away from the motor (1).

5. A feed screw for a rotary kiln according to any one of claims 1-4, characterized in that: The spiral blade (4) has a wear-resistant material layer welded on its feeding working surface, and the wear-resistant material layer is made of 85 steel.

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