A new composite sealing device suitable for the feed end of the grinding mill

Abstract

The present invention relates to a novel composite sealing device suitable for the feed end of a mill, comprising a flange, an adjusting bolt, an end face spiral labyrinth, a wedge ring, a sealing pressure plate, an air distribution pipe, etc. The wedge ring is fixed to the groove of the feed pipe, the end face spiral labyrinth floats on the feed pipe by contacting and cooperating with the wedge ring, the adjusting bolt is connected to the flange fixed to the feed pipe, and the adjusting bolt is rotated to adjust the floating position of the end face spiral labyrinth, the sealing pressure plate is connected to the feed port flange of the mill barrel by bolts, and the air distribution pipe is connected to the end face spiral labyrinth, and is evenly distributed in the labyrinth groove along the circumference; the present invention designs an end face spiral labyrinth sealing structure and uses compressed air as the sealing medium, which can not only ensure the sealing effect, but also solve the problem of frequent replacement of seals and adjustment of alignment; at the same time, it can realize online adjustment and compensation of the sealing gap, reduce the number of mill shutdowns due to leakage of the feed end seal, and improve the operation efficiency of the mill.

Description

Technical Field

[0001] The invention belongs to the technical field of mining mills, and in particular relates to a novel composite sealing device suitable for a mill feed end, and is suitable for various medium and large mills. Background Art

[0002] As a crucial piece of equipment in the mineral processing process, mills are primarily used for fine grinding of crushed ore. Due to their high grinding efficiency, they are widely used in various industries, including nonferrous metals, ferrous metals, chemicals, and building materials. Depending on the properties of the ore, they are categorized as either dry or wet grinding. With the development of mining machinery, equipment has become increasingly larger, more digital, and cleaner. Consequently, parameters such as mill barrel diameter and length have also increased, placing increasingly stringent requirements on equipment cleanliness.

[0003] In actual production, sealing issues at the mill barrel feed end are critical indicators that directly impact mill operation safety, processing capacity, and environmental hygiene. Once slurry enters the bearing housing, it can cause fatal damage to the bearing shell. On the one hand, a tight rubber seal between the feeder's feed pipe and the mill barrel feed end can exacerbate wear on the seal. Furthermore, this seal is ineffective, allowing slurry to squeeze out of the gap. The feeder's limited adjustment range prevents adequate sealing, and seal adjustment requires the mill to be shut down, impacting operational efficiency. On the other hand, a loose rubber seal between the feeder's feed pipe and the mill barrel feed end can ineffectively seal. Furthermore, during mill installation or maintenance, the traditional rubber gasket, bolted to the mill barrel, requires frequent removal and replacement to ensure a tight seal. This large size of the spare parts makes disassembly difficult, and the harsh working environment makes it difficult to operate, impacting mill efficiency. Therefore, a new, safe, stable, and online adjustable sealing device is urgently needed to meet the operational requirements of large mills. Therefore, in actual production, there is an urgent need for a new type of sealing device that is safe, stable, has good sealing effect, and can be adjusted online to meet the operating requirements of large mills. Summary of the Invention

[0004] In order to make up for the shortcomings of the existing technology, the present invention provides a new composite sealing device suitable for the feed end of the mill. The device is designed with an end face spiral labyrinth sealing structure and uses compressed air as the sealing medium, which can not only ensure the sealing effect, but also solve the complex adjustment and alignment problems during frequent replacement of seals and installation and maintenance; at the same time, it can realize online adjustment and compensation of the sealing gap, reduce the number of mill shutdowns caused by leakage of the feed end seal, and improve the operation efficiency of the mill.

[0005] To achieve the above object, the present invention is implemented through the following technical solutions:

[0006] The present invention discloses a novel composite sealing device suitable for the feed end of a mill, comprising a flange, an adjusting bolt, an end face spiral labyrinth, a wedge ring, a sealing pressure plate, an air distribution pipe, etc. The wedge ring is fixed to the groove of the feed pipe, and the inner hole of the end face spiral labyrinth floats on the feed pipe by contacting and cooperating with the wedge-shaped surface of the outer circle of the wedge ring. The adjusting bolt is connected to the flange fixed to the feed pipe and cooperates with one end of the spiral labyrinth. The adjusting bolt is rotated to adjust the floating position of the end face spiral labyrinth. The sealing pressure plate is connected to the feed inlet flange of the mill cylinder via bolts. The sealing pressure plate rotates with the cylinder and cooperates with the spiral end face of the other end of the end face spiral labyrinth. The air distribution pipe is connected to the end face spiral labyrinth and is evenly distributed circumferentially within the labyrinth groove of the end face spiral labyrinth, thereby forming this sealing device.

[0007] The wedge ring, end face spiral labyrinth body and sealing pressure plate in the present invention are all made of wear-resistant polyurethane material. Due to its large elastic modulus, when the floating position of the spiral labyrinth body is adjusted online, the sealing between it and the wedge ring can be fully guaranteed to prevent the leakage of slurry. The end face spiral labyrinth body and sealing pressure plate are vulcanized on the base flange to increase the mechanical strength.

[0008] Compressed air is used as the sealing medium and is evenly delivered into the labyrinth groove along the circumferential direction through the air distribution pipe connected to the end face spiral labyrinth body.

[0009] The end face spiral labyrinth structure is an end face spiral seal. Using the principle of Archimedes' equidistant spiral, the polyurethane end face is grooved. The spiral rotation direction is consistent with the direction of the mill barrel, so that the flow trend of the sealing gas is consistent with the direction of the mill barrel. The gas can flow continuously and evenly in the groove with stable pressure. The starting and ending points of the spiral are both placed directly above the feed pipe, and the starting point is the sealing gas leakage point. The cross-section of the starting point is smaller than the cross-section of the spiral labyrinth groove, which is convenient for discharging occasional leaked materials and reducing sealing gas consumption. The end point of the spiral is sealed to prevent material leakage.

[0010] The end face spiral labyrinth floats on the feed pipe by contacting and cooperating with the wedge ring, ensuring sealing while allowing axial adjustment and not rotating with the cylinder. The sealing pressure plate rotates with the cylinder and cooperates with the end face spiral labyrinth.

[0011] By rotating the adjusting bolt installed on the feed pipe flange, the axial floating position of the end face spiral labyrinth can be adjusted, and the matching clearance between the end face spiral labyrinth, the sealing pressure plate and the wedge ring can be adjusted online.

[0012] Beneficial effects:

[0013] The present invention designs an end face spiral labyrinth sealing structure, utilizes the principle of Archimedes' equidistant spiral, grooves the polyurethane end face portion, and the spiral rotation direction is consistent with the rotation direction of the mill cylinder, so that the flow trend of the sealing gas is consistent with the rotation direction of the mill cylinder, and the purpose of the sealing gas bringing trace leakage materials into the cylinder is achieved; the gas can flow continuously and evenly in the groove, and the pressure is stable; the starting point and the end point of the spiral are both located directly above the feeding pipe, and the starting point is the sealing gas leakage point. The cross-section of the starting point is smaller than the cross-section of the spiral labyrinth groove, which is convenient for discharging occasional leakage materials and reduces the consumption of sealing gas; the end point of the spiral is sealed to prevent the material from leaking outward.

[0014] The present invention utilizes compressed air as a sealing medium, which can not only ensure the sealing effect, but also solve the problem of complex adjustment and alignment during frequent replacement of seals and installation and maintenance; utilizes gas lubrication to quickly remove the heat generated by occasional friction between the end face spiral labyrinth and the sealing pressure plate, thereby achieving the purpose of reducing wear; at the same time, it realizes online adjustment and compensation of the sealing gap, reduces the number of mill shutdowns caused by leakage of the feed end seal, and improves the operating efficiency of the mill. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0016] Figure 2 Schematic diagram of the sealing device structure of the present invention;

[0017] Figure 3 It is a schematic diagram of the partial structure of the sealing device of the present invention;

[0018] Figure 4 This is a schematic diagram of the end face spiral labyrinth structure of the present invention;

[0019] Explanation of symbols for the main parts in the figure: 1-flange; 2-adjusting bolt; 3-end face spiral labyrinth; 4-wedge ring; 5-sealing pressure plate; 6-gas distribution pipe. DETAILED DESCRIPTION

[0020] In order to make the purpose, content and advantages of the present invention more clear, the specific embodiments of the present invention are further described in detail below.

[0021] The present invention proposes a novel composite sealing device suitable for the feed end of a grinding mill, comprising a flange (1), an adjusting bolt (2), an end face spiral labyrinth (3), a wedge ring (4), a sealing pressure plate (5), and an air distribution pipe (6);

[0022] The wedge ring (4) is fixed to the groove of the feed pipe, and the inner hole of the end face spiral labyrinth body (3) floats on the feed pipe by contacting and matching with the wedge surface of the outer circle of the wedge ring (4). The adjusting bolt (2) is connected to the flange (1) fixed to the feed pipe and matches with one end of the spiral labyrinth body (3). The adjusting bolt (2) is rotated to adjust the floating position of the end face spiral labyrinth body (3). The sealing pressure plate (5) is connected to the feed port flange of the mill cylinder through bolts. The sealing pressure plate (5) rotates with the cylinder and matches with the spiral end face of the other end of the end face spiral labyrinth body (3). The gas distribution pipe (6) is connected to the end face spiral labyrinth body (3) and is evenly distributed in the labyrinth groove of the end face spiral labyrinth body (3) along the circumferential direction.

[0023] The wedge ring (4), the end face spiral labyrinth body (3), and the sealing pressure plate (5) are all made of wear-resistant polyurethane material. Due to its large elastic modulus, when the floating position of the spiral labyrinth body (3) is adjusted online, the sealing performance between the wedge ring (4) and the end face spiral labyrinth body (3) and the sealing pressure plate (5) can be fully guaranteed to prevent the leakage of slurry. In addition, the end face spiral labyrinth body (3) and the sealing pressure plate (5) are vulcanized on the base flange to increase the mechanical strength.

[0024] Compressed air is used as a sealing medium and is uniformly fed into the labyrinth groove along the circumferential direction through an air distribution pipe (6) connected to the end face spiral labyrinth body.

[0025] The end face spiral labyrinth body (3) is a spiral seal of the end face. The polyurethane end face is grooved by using the Archimedean equidistant spiral principle. The spiral rotation direction is consistent with the direction of the mill barrel. The gas can flow continuously and evenly in the groove with stable pressure. The starting point and the end point of the spiral are both placed directly above the feed pipe, and the starting point is the sealing gas leakage point. The cross section of the starting point is smaller than the cross section of the spiral labyrinth groove, which is convenient for discharging occasional leaked materials and reduces the consumption of sealing gas. The end point of the spiral is sealed to prevent the material from leaking out.

[0026] The inner hole of the end face spiral labyrinth (3) floats on the feed pipe by contacting and cooperating with the wedge surface of the outer circle of the wedge ring (4), ensuring sealing while allowing axial adjustment and not rotating with the cylinder. The sealing pressure plate (5) rotates with the cylinder and cooperates with the spiral end face of the end face spiral labyrinth.

[0027] By rotating the adjusting bolt (2) installed on the feed pipe flange (1), the axial floating position of the end face spiral labyrinth (3) can be adjusted, thereby achieving online adjustment of the matching clearance between the end face spiral labyrinth (3), the sealing pressure plate (5) and the wedge ring (4).

[0028] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A composite sealing device suitable for the feed end of a mill, comprising a flange (1), an adjusting bolt (2), an end face spiral labyrinth (3), a wedge ring (4), a sealing pressure plate (5), and an air distribution pipe (6); the wedge ring (4) is fixed to the groove of the feed pipe, the inner hole of the end face spiral labyrinth (3) floats on the feed pipe by contacting and cooperating with the wedge surface of the outer circle of the wedge ring (4), the adjusting bolt (2) is connected to the flange (1) fixed to the feed pipe and cooperates with one end of the spiral labyrinth (3), the adjusting bolt (2) is rotated to adjust the floating position of the end face spiral labyrinth (3), the sealing pressure plate (5) is connected to the feed port flange of the mill cylinder by bolts, the sealing pressure plate (5) rotates with the cylinder and cooperates with the spiral end face of the other end of the end face spiral labyrinth (3), the air distribution pipe (6) is connected to the end face spiral labyrinth (3) and is evenly distributed in the labyrinth groove of the end face spiral labyrinth (3) along the circumferential direction.

2. The composite sealing device suitable for the feed end of a mill according to claim 1 is characterized in that: The wedge ring (4), the end face spiral labyrinth body (3), and the sealing pressure plate (5) are all made of wear-resistant polyurethane material, and the end face spiral labyrinth body (3) and the sealing pressure plate (5) are all vulcanized on the base flange.

3. The composite sealing device suitable for the feed end of a grinding mill according to claim 1 is characterized in that: Compressed air is used as a sealing medium and is uniformly fed into the labyrinth groove along the circumferential direction through an air distribution pipe (6) connected to an end face spiral labyrinth body (3).

4. The composite sealing device suitable for the feed end of a grinding mill according to claim 1 is characterized in that: The end face spiral labyrinth body (3) is an end face spiral seal. The polyurethane end face is grooved by using the Archimedean equidistant spiral principle. The spiral rotation direction is consistent with the direction of the mill cylinder, so that the flow trend of the sealing gas is consistent with the direction of the mill cylinder. The gas can flow continuously and evenly in the groove with stable pressure. The starting point and the end point of the spiral are both placed directly above the feed pipe, and the starting point is the sealing gas leakage point. The cross section of the starting point is smaller than the cross section of the spiral labyrinth groove, and the end point of the spiral is sealed.

5. The composite sealing device suitable for the feed end of a grinding mill according to claim 1 is characterized in that: The end face spiral labyrinth body (3) does not rotate with the cylinder.

6. The composite sealing device suitable for the feed end of a grinding mill according to claim 1 is characterized in that: By rotating the adjusting bolt (2) installed on the feed pipe flange (1), the axial floating position of the end face spiral labyrinth (3) can be adjusted, thereby achieving online adjustment of the matching clearance between the end face spiral labyrinth (3), the sealing pressure plate (5) and the wedge ring (4).

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