A three-way seal device for a feeder shaft

Abstract

The utility model relates to cement manufacturing technical field, concretely is a kind of three sealing devices of feeder shaft, including sealing matrix, the sealing matrix is by front end guide part, integrated intermediate part and rear end reinforcing part constitute, the front end guide part and integrated intermediate part are integrated structure, the rear end reinforcing part is installed in the rear end of integrated intermediate part by fixed bolt, and the front end of the front end guide part is equipped with first sealing stop mouth part, the space inside integrated intermediate part forms second grease sealing cavity, the part of rear end reinforcing part that extends into integrated intermediate part rear end interior forms third packing seal. This three sealing devices of feeder shaft effectively improves sealing performance and durability, reduces material leakage and maintenance frequency, significantly improves working environment, and ensures the continuity of production and high efficiency operation, while reducing manpower and time cost.

Description

Technical Field

[0001] This utility model relates to the field of cement manufacturing technology, specifically to a three-seal device for a feeder shaft. Background Technology

[0002] In cement production, precise material conveying and control are crucial for ensuring production efficiency and product quality. As an important component of the material transport system, the sealing performance of the mineral powder silo feeder directly affects the stability of equipment operation and the cleanliness of the environment.

[0003] Existing mineral powder silo feeders typically use impeller feeders and are sealed with rubber sealing rings at both ends. This sealing method can meet basic sealing requirements, but under long-term operation and complex working conditions, especially under positive pressure operation, the rubber sealing rings will gradually wear down, leading to material leakage, i.e., material spillage and dust emission. This not only affects the on-site working environment and increases additional manpower costs for cleaning, but also requires equipment shutdown every time the sealing ring is replaced, seriously affecting the continuity and efficiency of production. At the same time, frequent maintenance operations also increase the operating costs and management difficulty of the equipment. Utility Model Content

[0004] The purpose of this utility model is to provide a three-seal device for the feeder shaft to solve the problems mentioned in the background art, such as material leakage caused by easy wear of rubber seals in current mineral powder silo feeders under long-term operation and complex working conditions, increased manpower and time costs due to frequent maintenance, and production continuity affected by equipment downtime.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a three-seal device for a feeder shaft, comprising a sealing base, the sealing base being composed of a front guide portion, an integrated intermediate portion, and a rear reinforcement portion, the front guide portion and the integrated intermediate portion being an integral structure, the rear reinforcement portion being installed at the rear end of the integrated intermediate portion by fixing bolts, and the front end of the front guide portion being provided with a first sealing stop portion, the space inside the integrated intermediate portion forming a second grease sealing cavity, and the portion of the rear reinforcement portion extending into the rear end of the integrated intermediate portion forming a third packing seal.

[0006] Preferably, the first sealing stop is an annular groove structure, the bottom diameter of which matches the outer diameter of the feeder shaft, and the groove opening width is smaller than the bottom width, forming an inverted trapezoidal cross-section that is narrower inside and wider outside.

[0007] Preferably, the space of the second grease sealing cavity extends axially along the integrated middle part, and its inner cavity is cylindrical.

[0008] Preferably, the contact section of the third packing seal is longer than two-thirds of the depth of the rear reinforcement extending into the integrated middle section, and the inner wall of this section is a smooth cylindrical surface.

[0009] Preferably, the top of the integrated intermediate part is provided with a filling hole, and the axis of the filling hole is inclined at an angle of 30°-60° with the central axis of the integrated intermediate part.

[0010] Preferably, the bottom end of the filling port is connected to the interior of the second grease sealing cavity, and a sealing plug is screwed onto the outer port of the filling port.

[0011] Compared with existing technologies, the beneficial effects of this utility model are: the three-seal device for the feeder shaft effectively improves sealing performance and durability, reduces material leakage and maintenance frequency, significantly improves the working environment, and ensures continuous and efficient production while reducing labor and time costs. The device achieves effective packing compression and positioning through the inverted trapezoidal annular groove structure of the first sealing stop in the front guide section, enhancing the initial sealing effect. Furthermore, the integration of the second grease sealing cavity in the middle section with the filling port allows for periodic grease replenishment, forming a continuous barrier oil film seal and reducing shaft wear. Simultaneously, the third packing seal in the rear reinforcement section ensures reliable end sealing and facilitates disassembly and maintenance. Attached Figure Description

[0012] Fig. 1 This is a schematic diagram of the structure of a three-seal device for a feeder shaft according to the present invention;

[0013] Fig. 2 This is a schematic diagram of the inner structure of the rear reinforcement part of a three-seal device for a feeder shaft according to the present invention;

[0014] Fig. 3 This is a schematic diagram of the front end structure of the sealing base of a three-seal device for a feeder shaft according to the present invention.

[0015] In the figure: 1. Sealing substrate; 2. Front guide part; 201. First sealing stop part; 3. Integrated intermediate part; 301. Second grease sealing cavity; 302. Filling hole; 4. Rear reinforcement part; 401. Third packing seal. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figs. 1-3This utility model provides a technical solution: a three-seal device for a feeder shaft, comprising a sealing base 1, which is composed of a front guide part 2, an integrated intermediate part 3, and a rear reinforcement part 4. The front guide part 2 and the integrated intermediate part 3 are an integral structure. The front guide part 2 is a flange structure with mounting holes at both its upper and lower ends. The rear reinforcement part 4 is installed at the rear end of the integrated intermediate part 3 by fixing bolts. The front end of the front guide part 2 is provided with a first sealing stop part 201. The space inside the integrated intermediate part 3 forms a second grease sealing cavity 301. The portion of the rear reinforcement part 4 extending into the rear end of the integrated intermediate part 3 forms a third packing seal 401. In this structure, the feeder shaft passes through the first sealing stop part at the front end of the front guide part 2. 201. This structure is filled with packing and subjected to axial pressure by an external gland, causing the packing to expand radially and tightly adhere to the shaft surface, forming the first reliable mechanical seal barrier. This effectively prevents dust from escaping along the axial front end. Simultaneously, the second grease-sealed cavity 301 formed inside the integrated intermediate part 3, through periodic injection of calcium-based grease, forms a continuous oil seal layer within the cavity. This not only further blocks the axial diffusion path of dust but also provides lubrication and cooling, reducing friction and wear between the shaft and the sealing structure. The rear reinforcement part 4 is securely connected to the rear end of the integrated intermediate part 3 by fixing bolts. Its portion extending into the integrated intermediate part 3, together with the inner wall, forms the third packing seal 401. Similarly, the compressed packing achieves a circumferential seal on the shaft, preventing dust from escaping from the rear end. To prevent the infiltration of materials or dust, three sealing structures are connected in series to form multi-level protection. The entire sealing system works synergistically, significantly improving the overall reliability and durability of the seal. This completely solves the problems of material leakage, working environment pollution, frequent downtime maintenance, and increased labor and time costs caused by the easy wear of rubber seals under long-term operation and complex working conditions in existing technologies. The first sealing stop 201 is an annular groove structure. The bottom diameter of the groove matches the outer diameter of the feeder shaft, and the groove width is smaller than the bottom width, forming an inverted trapezoidal cross-section that is narrower inside and wider outside. The feeder shaft passes through the annular groove of the first sealing stop 201 to form an initial sealing fit. When the external pressure cap applies axial pressure, the packing material filled in the groove is subjected to... Radial plastic deformation occurs after compression. Because the groove width is smaller than the groove bottom width, the packing is effectively constrained inside the groove, preventing it from being squeezed out or leaking at the end face under high pressure. At the same time, the inverted trapezoidal structure makes the sealing effect stronger as the pressure is tighter, forcing the packing to fit more fully against the shaft surface and the groove sidewall, significantly enhancing the reliability and pressure resistance of the first seal. The space of the second grease sealing cavity 301 extends axially along the integrated middle part 3, and its inner cavity is cylindrical. In this structure, calcium-based grease is injected into the cavity of the second grease sealing cavity 301. The grease fills the cavity and forms a continuous oil seal layer. When the shaft rotates, the grease adheres to the shaft surface and generates a viscous damping effect, effectively blocking the diffusion channel of dust along the axial direction, while also playing a role in lubrication and cooling.To reduce friction and wear between the shaft and the sealing structure, the cylindrical inner cavity structure facilitates uniform distribution and stable storage of grease. Regular grease replenishment maintains long-term effective sealing performance. The contact section length of the third packing seal 401 is greater than two-thirds of the depth of the rear reinforcement 4 extending into the integrated intermediate part 3, and the inner wall of this section is a smooth cylindrical surface. When the packing is axially compressed by the gland, it deforms uniformly on the smooth cylindrical surface, tightly fitting against the shaft surface to form a stable third packing seal 401. The longer contact section effectively increases the resistance of the leakage path, significantly improving the reliability of the seal. Simultaneously, the smooth inner wall reduces scratches on the packing during compression, ensuring seal integrity. This structure not only enhances the pressure resistance of the end seal and prevents dust from escaping from the rear, but also facilitates installation and maintenance. The top of the integrated intermediate part 3 is provided with a filling port 302, the axis of which is inclined at a 30°-60° angle to the central axis of the integrated intermediate part 3. This structure allows for easy grease filling. The inclined channel design facilitates easier and more efficient operation, making it easier to align and insert the filling tool and reducing operational space limitations. During filling, the grease flows more smoothly into the second grease sealing cavity 301 along the inclined direction, gradually filling upwards and preventing air stagnation. This ensures the grease fully fills the sealing cavity, improving the oil seal effect. The bottom of the filling port 302 is connected to the inside of the second grease sealing cavity 301, and a sealing plug is screwed onto the outer port of the filling port 302. This structure ensures that externally injected grease flows smoothly into the sealing cavity, effectively replenishing and continuously lubricating the sealing area, maintaining the integrity of the oil seal. The sealing plug at the outer port of the filling port 302 allows for immediate closure of the orifice after grease filling, preventing grease from overflowing under pressure or vibration during operation. It also prevents external dust, moisture, or material particles from entering the filling port 302 and causing blockages, ensuring the cleanliness and stability of the lubrication system.

[0018] Working principle: When using the feeder shaft three-seal device, firstly, fix the front guide 2 to the equipment through the mounting holes on its flange structure to ensure that the front guide 2 is securely installed. Next, pass the feeder shaft through the first sealing stop 201 at the front end of the front guide 2 and fill the annular groove with packing material. Then, install the outer pressure cap and apply axial pressure to the packing by tightening the bolts, so that the packing expands radially to fit the shaft surface. Next, inject calcium-based grease into the second grease sealing cavity 301 through the filling port 302 at the top of the integrated intermediate part 3 until the entire cavity is filled. Then, tighten the sealing plug at the outer port of the filling port 302 to close the injection port. After that, securely install the rear reinforcement 4 to the rear end of the integrated intermediate part 3 with the fixing bolts, so that its extended part forms the third packing seal 401 with the interior of the integrated intermediate part 3. Install the pressure cap at this position and apply pressure to the packing to ensure that the packing fits tightly to the shaft surface. Finally, check that all parts are correctly installed and tightened in place, thus completing a series of operations.

[0019] 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 three-seal device for a feeder shaft, comprising a sealing base (1), characterized in that: The sealing substrate (1) is composed of a front guide part (2), an integrated middle part (3) and a rear reinforcement part (4). The front guide part (2) and the integrated middle part (3) are an integrated structure. The rear reinforcement part (4) is installed at the rear end of the integrated middle part (3) by fixing bolts. The front end of the front guide part (2) is provided with a first sealing stop part (201). The space inside the integrated middle part (3) forms a second grease sealing cavity (301). The part of the rear reinforcement part (4) that extends into the rear end of the integrated middle part (3) forms a third packing seal (401).

2. The three-seal device for a feeder shaft according to claim 1, characterized in that: The first sealing stop (201) is an annular groove structure. Its groove bottom diameter matches the outer diameter of the feeder shaft, and the groove opening width is smaller than the groove bottom width, forming an inverted trapezoidal cross section that is narrower inside and wider outside.

3. The three-seal device for a feeder shaft according to claim 1, characterized in that: The space of the second grease sealing cavity (301) extends axially along the integrated middle part (3), and its inner cavity is cylindrical.

4. The three-seal device for a feeder shaft according to claim 1, characterized in that: The contact section of the third packing seal (401) is longer than two-thirds of the depth of the rear reinforcement (4) extending into the integrated middle part (3), and the inner wall of this section is a smooth cylindrical surface.

5. The three-seal device for a feeder shaft according to claim 1, characterized in that: The top of the integrated intermediate part (3) is provided with a filling hole (302), and the axis of the filling hole (302) is inclined at an angle of 30°-60° with the central axis of the integrated intermediate part (3).

6. The three-seal device for a feeder shaft according to claim 5, characterized in that: The bottom end of the filling port (302) is connected to the interior of the second grease sealing cavity (301), and a sealing plug is screwed into the outer port of the filling port (302).

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