Adjustable labyrinth seal for feeding of grinding head

Abstract

The utility model relates to the technical field of sealing, and discloses an adjustable labyrinth seal for feeding of a grinding head, which comprises a feeding hopper, a feeding hopper cylinder section and a dust collecting hopper are respectively mounted on the right side of the feeding hopper, a labyrinth seal is arranged on the right side of the feeding hopper cylinder section, and a fine adjustment device is mounted on the right side of the labyrinth seal. The right side of the dust collecting hopper is connected with a graphite dipping flexible sealing ring, and the right side of the fine adjustment device is provided with a feeding spiral. According to the adjustable labyrinth seal for feeding of the grinding head, axial movement and radial deviation generated by operation of equipment are compensated in real time through the self-lubricating characteristic and the elastic modulus self-adaption characteristic of graphite materials, a dynamic sealing interface driven by pressure difference is constructed, and the dynamic sealing efficiency is improved through a multi-stage coupling sealing system.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, specifically an adjustable labyrinth seal for mill head feeding. Background Technology

[0002] In existing mill feeding systems, the connection between the feed hopper and the feed screw typically uses a packing seal assembly to achieve a rigid connection. Specifically, the lower cylindrical section of the feed hopper and the inlet end of the feed screw form an axial seal fit through the packing seal structure. However, in actual manufacturing, due to the influence of processing technology and assembly precision, the sealing mating surfaces of the outer diameter of the feed hopper cylindrical section and the inner diameter of the packing seal cannot achieve an ideal interference seal. When the mill is running, under the influence of material conveying pressure and the slightly negative and positive pressure environment of the mill head, the above-mentioned sealing gap will cause leakage of solid particulate material and dust, specifically manifested as material leakage and dust leakage in the mill head area. This not only causes material loss but also has an adverse impact on the production environment and equipment maintenance. Therefore, there is an urgent need for an adjustable labyrinth seal for mill head feeding to solve the above technical problems. Utility Model Content

[0003] The purpose of this invention is to provide an adjustable labyrinth seal for grinding head feeding, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] An adjustable labyrinth seal for grinding head feeding includes a feed hopper, a feed hopper cylindrical section and a dust collection hopper are respectively installed on the right side of the feed hopper, and a labyrinth seal is provided on the right side of the feed hopper cylindrical section. A fine-tuning device is installed on the right side of the labyrinth seal. A graphite-impregnated flexible sealing ring is connected to the right side of the dust collection hopper, and a feed screw is provided on the right side of the fine-tuning device.

[0006] Preferably, the outer circumferential surface of the feed hopper cylindrical section is fitted with a graphite-impregnated flexible sealing ring with a self-tightening function.

[0007] Preferably, the graphite-impregnated flexible sealing ring utilizes the self-lubricating properties and adaptive elastic modulus of graphite material to compensate for axial movement and radial displacement caused by equipment operation in real time, thereby constructing a dynamic sealing interface driven by pressure difference.

[0008] Preferably, the labyrinth seal employs a gradient pressure reduction method to implement secondary barrier.

[0009] Preferably, the labyrinth seal forms an eddy current deceleration chamber through alternating annular retaining rings and guide grooves.

[0010] Preferably, the lower part of the dust collection hopper is equipped with a pneumatic closed-loop ash discharge valve, which adopts a flange quick-installation structure to achieve non-stop maintenance. The operation and maintenance personnel trigger the periodic ash discharge program through the PLC control system to ensure the closed-loop recovery of escaped materials.

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

[0012] This invention achieves precise radial compression control of the sealing ring via a multi-directional fine-tuning device, forming an initial sealing interface that is interference-fitted with the feed hopper cylinder. As material flows through the feed hopper into the feed screw, under alternating micro-negative and positive pressure conditions in the material conveying pressure and the grinding head area, the flexible sealing ring, through the self-lubricating properties of graphite material and its adaptive elastic modulus, compensates in real time for axial movement and radial offset caused by equipment operation. This constructs a dynamic sealing interface driven by pressure difference, and through a multi-stage coupled sealing system, enhances dynamic sealing performance. Attached Figure Description

[0013] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0014] Figure 1 This is a schematic diagram of the overall structure of the adjustable labyrinth seal of this utility model;

[0015] Figure 2 This is a schematic diagram of the installation of the adjustable labyrinth seal of this utility model;

[0016] In the diagram: 1. Feed hopper; 2. Cylindrical section of feed hopper; 3. Labyrinth seal; 4. Fine-tuning device; 5. Graphite-impregnated flexible sealing ring; 6. Dust collection hopper; 7. Feed screw. Detailed Implementation

[0017] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings. In the embodiments of the present utility model, the different types of cross-sectional lines are not labeled according to national standards, nor do they specify material requirements for the components; they are used to distinguish the cross-sectional views of the components in the drawings.

[0018] Please see Figure 1-2An adjustable labyrinth seal for grinding head feeding includes a feed hopper 1. A feed hopper cylindrical section 2 and a dust collection hopper 6 are respectively installed on the right side of the feed hopper 1. A labyrinth seal 3 is provided on the right side of the feed hopper cylindrical section 2. A fine-tuning device 4 is installed on the right side of the labyrinth seal 3. A graphite-impregnated flexible sealing ring 5 is connected to the right side of the dust collection hopper 6. A feed spiral 7 is provided on the right side of the fine-tuning device 4.

[0019] Among them, the outer circumference of the cylindrical section 2 of the feed hopper is equipped with a graphite-impregnated flexible sealing ring 5 with a self-tightening function.

[0020] Among them, the graphite-impregnated flexible sealing ring 5 uses the self-lubricating properties and elastic modulus adaptive properties of graphite material to compensate for the axial movement and radial displacement caused by the operation of the equipment in real time, and constructs a dynamic sealing interface driven by pressure difference.

[0021] Among them, the labyrinth seal 3 adopts a gradient pressure reduction method to implement secondary isolation.

[0022] Among them, the labyrinth seal 3 forms an eddy current deceleration chamber through alternating annular retaining rings and guide grooves.

[0023] The lower part of the dust collection hopper 6 is equipped with a pneumatic closed ash discharge valve, which adopts a flange quick-installation structure to achieve non-stop maintenance. The operation and maintenance personnel trigger the periodic ash discharge program through the PLC control system to ensure the closed-loop recovery of escaped materials.

[0024] The working principle and usage process of this utility model: The sealing structure of this invention achieves dynamic sealing performance improvement through a multi-level coupling sealing system. The specific implementation includes: assembling a graphite impregnated flexible sealing ring 5 with self-tightening function on the outer circumferential surface of the precision-machined feed hopper cylindrical section 2. The graphite impregnated flexible sealing ring 5 is precisely controlled in terms of radial compression by a multi-directional fine-tuning device 4 to form an initial sealing interface that is interference fit with the feed hopper cylinder.

[0025] During the process of material flowing through the feed hopper 1 into the feed screw 7, under the alternating micro-negative and positive pressure conditions of the material conveying pressure and the grinding head area, the graphite impregnated flexible sealing ring 5 compensates for the axial movement and radial displacement caused by the operation of the equipment in real time through the self-lubricating properties and elastic modulus adaptive properties of the graphite material, and constructs a dynamic sealing interface driven by pressure difference.

[0026] For particles escaping through the main sealing layer, this structure innovatively employs a gradient-pressure-reducing labyrinth seal 3 for secondary isolation. This labyrinth seal 3 forms a vortex deceleration chamber through alternating annular baffles and guide channels, causing the escaping material to fall into the modular dust collection hopper 6 under centrifugal settling and gravity. The lower part of the dust collection hopper 6 is equipped with a pneumatically operated closed-loop ash discharge valve, which uses a flange quick-installation structure for non-stop maintenance. Maintenance personnel trigger a periodic ash discharge program via the PLC control system to ensure closed-loop recovery of the escaped material.

[0027] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0028] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An adjustable labyrinth seal for feeding a grinding head, comprising a feed hopper (1), characterized in that: The feed hopper (1) is equipped with a feed hopper cylindrical section (2) and a dust collection hopper (6) on its right side. A labyrinth seal (3) is provided on the right side of the feed hopper cylindrical section (2). A fine-tuning device (4) is installed on the right side of the labyrinth seal (3). A graphite-impregnated flexible sealing ring (5) is connected to the right side of the dust collection hopper (6). A feed screw (7) is provided on the right side of the fine-tuning device (4).

2. The adjustable labyrinth seal for mill head feeding according to claim 1, characterized in that: The outer circumference of the cylindrical section (2) of the feed hopper is fitted with a graphite-impregnated flexible sealing ring (5) with a self-tightening function.

3. The adjustable labyrinth seal for mill head feeding according to claim 1, characterized in that: The graphite-impregnated flexible sealing ring (5) uses the self-lubricating properties and elastic modulus adaptive properties of graphite material to compensate for the axial movement and radial displacement caused by the operation of the equipment in real time, and constructs a dynamic sealing interface driven by pressure difference.

4. The adjustable labyrinth seal for mill head feeding according to claim 1, characterized in that: The labyrinth seal (3) adopts a gradient pressure reduction method to implement secondary isolation.

5. An adjustable labyrinth seal for mill head feeding according to claim 1, characterized in that: The labyrinth seal (3) forms a vortex deceleration chamber through alternating annular retaining rings and guide grooves.

6. The adjustable labyrinth seal for mill head feeding according to claim 1, characterized in that: The lower part of the dust collection hopper (6) is equipped with a pneumatic closed ash discharge valve. The flange quick-installation structure enables non-stop maintenance. The maintenance personnel trigger the periodic ash discharge program through the PLC control system to ensure the closed-loop recovery of escaped materials.

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