Screw conveyer end cover sealing device

Abstract

The utility model relates to the technical field of cement materials, and particularly discloses a screw conveyor end cover sealing device which comprises a screw conveyor sleeve. A spiral conveying rotor is rotationally connected into the spiral conveyor sleeve; the spiral conveying rotor is sleeved with a reverse spiral shaft sleeve; the reverse spiral shaft sleeve is sleeved with a sealing chamber; a framework oil seal is inserted into the sealing chamber; a sealing gland is in contact with the upper surface of the framework oil seal; the sealing chamber is communicated and fixedly connected with a grease injection nozzle; grease is injected through the grease injection nozzle to be filled in the sealing chamber, then micro-positive pressure is generated under stirring driving of the reverse spiral shaft sleeve, the micro-positive pressure is blocked in a gap between the reverse spiral shaft sleeve and the spiral conveyor sleeve under pressure, materials in the spiral conveyor sleeve are prevented from entering the sealing chamber to damage sealing, and meanwhile the self-cleaning effect is achieved. And a long-term sealing effect can be achieved.

Description

Technical Field

[0001] This utility model relates to the field of cement material technology, specifically a sealing device for the end cover of a screw conveyor. Background Technology

[0002] Cement plants often use screw conveyor rotors in conjunction with compressed air to transport powdery materials such as fly ash and mineral powder. The shaft end seal usually adopts packing and wear-resistant sleeves to achieve the sealing effect. Packing, also called sealing packing, is usually made of relatively soft wire woven into strips with a cross-sectional area of ​​square, rectangle, or circle, which are filled in the sealing cavity.

[0003] However, the above-mentioned publicly available solutions have the following shortcomings: after a period of use, the packing will undergo irreversible deformation, and the gap between it and the wear-resistant sleeve will continue to increase, causing the seal to fail. The sealing structure has a short service life, and at the same time, the material exerts positive pressure on the output end cover seal as the screw conveyor operates, continuously squeezing and destroying the seal. Utility Model Content

[0004] The purpose of this invention is to solve the technical problems that packing will undergo irreversible deformation after a period of use, the gap between it and the wear-resistant sleeve will continue to increase, resulting in sealing failure, the sealing structure will not last long, and the material will exert positive pressure on the output end cover seal as the screw conveyor operates, continuously squeezing and destroying the seal. The invention provides a screw conveyor end cover sealing device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution;

[0006] The present invention relates to a sealing device for an end cover of a screw conveyor, comprising a screw conveyor sleeve; a screw conveyor rotor rotatably connected inside the screw conveyor sleeve; a reverse screw shaft sleeve fitted onto the screw conveyor rotor; a sealing chamber fitted onto the reverse screw shaft sleeve; a skeleton oil seal inserted into the sealing chamber; a sealing cap contacting the skeleton oil seal; and a grease injection nozzle fixedly connected to the sealing chamber.

[0007] Furthermore, the sealing gland has openings through which multiple fixing screws are inserted; one end of each fixing screw is fixed to the screw conveyor sleeve; and a nut is threaded onto the fixing screw corresponding to the sealing gland.

[0008] Furthermore, the screw conveyor sleeve is fixedly connected with limit baffles at intervals.

[0009] The screw conveyor end cover sealing device provided by this utility model has the following beneficial effects:

[0010] 1. This utility model injects grease into the sealing chamber through a grease injection nozzle. Then, under the stirring drive of the anti-spiral shaft sleeve, the grease is pressurized and enters the screw conveyor sleeve. It is pressurized and blocks the gap between the screw conveyor sleeve and the screw conveyor sleeve, preventing the material in the screw conveyor sleeve from entering the sealing chamber and damaging the seal. At the same time, it plays a self-cleaning role and can play a sealing role for a long time.

[0011] 2. This utility model uses a rotating nut to move on a fixed screw, thereby squeezing the sealing cap against the skeleton oil seal and blocking the sealing chamber, so that the sealing chamber is kept in a sealed state for a long time, the grease inside will not leak, and the sealing performance can be maintained for a long time. Attached Figure Description

[0012] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings;

[0013] Figure 1 This is a schematic diagram of the first isometric structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the second isometric structure of this utility model;

[0015] Figure 3 This is a front cross-sectional view of the present invention.

[0016] The following are the labels in the diagram: 1. Sealing gland; 2. Skeleton oil seal; 3. Sealing chamber; 4. Reverse spiral bushing; 5. Screw conveyor rotor; 6. Grease injection nozzle; 7. Fixed screw; 8. Screw conveyor sleeve; 9. Nut; 10. Limiting baffle; 11. Intermediate baffle. Detailed Implementation

[0017] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0018] 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 a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] It should be noted that all directional indications (such as up-down-left-right-forward-backward...) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly. The connection can be a direct connection or an indirect connection.

[0020] Please see Figure 1-3 As shown, a screw conveyor end cover sealing device includes a screw conveyor sleeve 8 for conveying powdery materials such as fly ash and mineral powder; a screw conveyor rotor 5 is rotatably connected inside the screw conveyor sleeve 8, and the screw conveyor rotor 5 is driven by a motor; a reverse screw shaft sleeve 4 is sleeved on the screw conveyor rotor 5; a sealing chamber 3 is sealed and fitted on the reverse screw shaft sleeve 4; a skeleton oil seal 2 is sealed and inserted inside the sealing chamber 3; a sealing cap 1 is in contact with the skeleton oil seal 2; a grease injection nozzle 6 is connected and fixed to the sealing chamber 3, and grease is injected through the grease injection nozzle 6 to fill the sealing chamber 3. Then, under the stirring drive of the reverse screw shaft sleeve 4, pressure is generated and it enters the screw conveyor sleeve 8, and blocks the gap between the screw conveyor sleeve 8 and the grease, preventing the material inside the screw conveyor sleeve 8 from entering the sealing chamber 3 and damaging the seal. At the same time, it plays a self-cleaning role and can play a long-term sealing role.

[0021] The sealing cap 1 has an opening through which multiple fixing screws 7 are inserted; one end of the fixing screw 7 is fixed to the screw conveyor sleeve 8; a nut 9 is threaded onto the fixing screw 7 corresponding to the sealing cap 1. By rotating the nut 9, the nut moves on the fixing screw 7, thereby squeezing the sealing cap 1 against the skeleton oil seal 2 and blocking the sealing chamber 3, so that the sealing chamber 3 is in a sealed state for a long time, and the grease inside will not leak, thus maintaining the sealing performance for a long time.

[0022] Limiting baffles 10 are fixedly connected at intervals inside the screw conveyor sleeve 8. The limiting baffles 10 extend the movement path of the butter and powder, thereby improving the separation effect of the powder.

[0023] An intermediate baffle 11 is fixedly connected to the corresponding limiting baffle 10 on the spiral conveying rotor 5, which extends the movement path of the butter and powder, thereby improving the effect of isolating the powder.

[0024] The sealing chamber 3 has grooves at both ends; the sealing cap 1 and the skeleton oil seal 2 are both located in the grooves at both ends of the sealing chamber 3. The grooves increase the sealing performance and connection strength of the sealing cap 1 and the skeleton oil seal 2, making the sealing more stable over long-term use.

[0025] The anti-spiral bushing 4 and the spiral conveying rotor 5 have opposite spiral directions, so that the anti-spiral bushing 4 can drive the grease to block the powder driven by the spiral conveying rotor 5 under pressure, thereby maintaining the seal and preventing the seal of the sealing chamber 3 from being damaged.

[0026] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A sealing device for an end cover of a screw conveyor, characterized in that; Includes a screw conveyor sleeve (8); a screw conveyor rotor (5) is rotatably connected inside the screw conveyor sleeve (8); a reverse screw shaft sleeve (4) is fitted on the screw conveyor rotor (5); a sealing chamber (3) is fitted on the reverse screw shaft sleeve (4); a skeleton oil seal (2) is inserted into the sealing chamber (3); a sealing cap (1) is in contact with the skeleton oil seal (2); and a grease injection nozzle (6) is connected and fixed to the sealing chamber (3).

2. The screw conveyor end cover sealing device according to claim 1, characterized in that: The sealing cap (1) has an opening for inserting multiple fixing screws (7); one end of the fixing screw (7) is fixed to the screw conveyor sleeve (8); and a nut (9) is threaded onto the fixing screw (7) corresponding to the sealing cap (1).

3. The screw conveyor end cover sealing device according to claim 2, characterized in that: Limiting baffles (10) are fixedly connected at intervals inside the screw conveyor sleeve (8).

4. The screw conveyor end cover sealing device according to claim 3, characterized in that: An intermediate baffle (11) is fixedly connected to the corresponding limiting baffle (10) on the spiral conveying rotor (5).

5. The screw conveyor end cover sealing device according to claim 4, characterized in that: The sealing chamber (3) has grooves at both ends; the sealing cap (1) and the skeleton oil seal (2) are both located in the grooves at both ends of the sealing chamber (3).

6. The screw conveyor end cover sealing device according to claim 5, characterized in that: The anti-helical bushing (4) and the helical conveying rotor (5) have opposite helical directions.

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