Mill feed pipe seal

Abstract

The utility model relates to a kind of mill feeding pipe sealing devices, including feeding pipe and feed bushing, it is characterized by: still include sealing member, the sealing member includes wear flange, rubber sleeve and short pipe shaft sleeve packing seal assembly, the wear flange contact type sleeve is connected on feeding pipe, the rubber sleeve contact type axial sleeve is connected on feeding pipe, the inner end surface of rubber sleeve and wear flange outer end surface abut;The short pipe shaft sleeve packing seal assembly includes short pipe, shaft sleeve, sealing packing and flange packing gland.The utility model has the advantages that: since adopting wear flange contact type radial seal, rubber sleeve contact type axial seal, short pipe shaft sleeve packing seal threefold combination seal, effectively improve the sealing effect, simultaneously since the short pipe of the utility model is split type detachable structure, when feeding seal fails maintenance, feeding straight pipe does not have to be disassembled and replaced, and operation rate is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of mineral processing equipment technology, and in particular to a mill feed pipe sealing device. Technical Background

[0002] The mill is the core equipment of a mineral processing plant. The ore is fed into the mill through the straight section of the feed pipe or the straight section of the feed bend, which passes through the circular hole in the center of the feed bushing. To prevent the feed bushing from contacting and rubbing against the feed pipe when the mill rotates, a certain radial gap, usually a few millimeters, is designed between the feed bushing, which rotates with the mill, and the stationary feed pipe. This gap can cause the slurry inside the mill to overflow and leak through the gap. Severe leakage can lead to severe wear on the inner surface of the feed bushing's central hole and the outer surface of the feed pipe. Moreover, the inability to handle a large amount of overflowing slurry can cause the mill to malfunction and shut down.

[0003] To address the aforementioned issues, a stop is designed on the feed bushing, and a full-circle elastic sealing ring (with cross-sectional shapes such as O-ring or lip) is installed at the stop for sealing. Alternatively, the elastic sealing ring can be flanged and installed on the end face of the feed bushing for sealing. The inner diameter of the sealing ring is generally consistent with the outer diameter of the feed straight pipe. While this integral sealing structure solves the problem of sealing the radial gap between the feed bushing and the feed straight pipe, its integral nature makes seal inspection and replacement inconvenient, resulting in a high maintenance rate. For example, when the elastic sealing ring wears to its limit, it needs to be disassembled and replaced as a whole, including the feed straight pipe, which takes a long time each time, typically tens of hours. Utility Model Content

[0004] To address the problems existing in the prior art, this utility model provides a mill feed pipe sealing device, which not only improves the sealing effect, but also eliminates the need to disassemble and replace the feed pipe when the feed seal fails. When not replacing the entire pipe, the maintenance time can be shortened to about 6-24 hours each time, which can significantly improve the operating rate.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] This utility model discloses a mill feed pipe sealing device, comprising a feed pipe and a feed bushing fitted on the feed pipe. The device is characterized by further including a sealing component, which comprises a wear-resistant flange, a rubber sleeve, and a short pipe bushing packing seal assembly. The wear-resistant flange is radially fitted onto the feed pipe in contact, with its inner end face abutting the feed bushing. The rubber sleeve is axially fitted onto the feed pipe in contact, with its inner end face abutting the outer end face of the wear-resistant flange.

[0007] The short-tube bushing packing seal assembly includes a short tube, a bushing, a sealing packing, and a flange packing gland. The bushing is a hollow bushing with a shoulder boss, fixedly fitted onto the feed pipe, with the inner end face of the hollow bushing abutting against the outer end face of the rubber sleeve. The short tube consists of two detachably assembled semi-circular short tubes with high and low flanges at their top left and right ends respectively, symmetrically fitted onto the outside of the hollow bushing and the rubber sleeve, with the mating surfaces of the two semi-circular short tubes aligned. They are joined together by bolts or welding to form a single short tube. The sealing packing is wound around the bushing. The outer edge of the shoulder boss is filled with the radial gap between the short pipe and the bushing. The flange packing gland is set at the outer end of the low flange of the short pipe and the sealing packing. The inner edge is fitted on the hollow bushing, and the outer end of the hollow bushing extends out of the flange packing gland. The flange packing gland is used to apply axial clamping force to the sealing packing, pressing the sealing packing tightly onto the innermost shoulder boss of the bushing. The high flange end of the short pipe with the shoulder boss is fixedly connected to the wear-resistant flange together with the feed bushing through a bolt assembly. The low flange end of the short pipe is fixedly connected to the flange packing gland through a bolt assembly.

[0008] As a further description of the above technical solution: the wear-resistant flange is made of resin or rubber flexible material to form an integral wear-resistant flange or a wear-resistant flange with two half-circles of wear-resistant flanges joined together.

[0009] As a further description of the above technical solution: the wear-resistant flanges that are joined together by the semi-circular wear-resistant flanges are made by cutting a beveled section at the joint of one semi-circular wear-resistant flange and cutting a corresponding beveled section on the other semi-circular wear-resistant flange. The two are then fixedly connected to form an integral wear-resistant flange by quick-drying adhesive.

[0010] As a further description of the above technical solution: the rubber sleeve is a solid integral structure rubber sleeve, a split-type butt joint structure rubber sleeve, or a ring-shaped open butt joint structure rubber sleeve. If a split-type butt joint structure rubber sleeve is used, a connecting plate is provided on the outer end face circumferentially. After being butt jointed on the feed pipe, the connecting plates of the two split-type rubber sleeves are butt jointed and then fixedly connected by bolt assembly; or a ring-shaped open butt joint structure rubber sleeve is used, with threaded holes designed at both ends of the opening. After the ring-shaped open butt joint structure rubber sleeve is fitted onto the feed straight pipe, a steel connecting plate is used to fasten the two threaded holes with matching bolts to connect the ring-shaped open butt joint structure rubber sleeve into a complete ring.

[0011] As a further description of the above technical solution: the bushing is an integral bushing or a split bushing. If the bushing is a split bushing, a gap or chamfer is provided at the connection of the two mating split bushings, or a connecting plate is provided at the connection. The two split bushings are fixedly connected by welding or bolt assembly.

[0012] As a further description of the above technical solution: the hollow bushing with shoulder boss is provided with an axial packing water seal pipe hole, and the packing water seal pipe hole is provided with an outer end water inlet, an inner end radial water outlet and an axial water outlet in the axial or radial direction, for connecting to the external sealing packing water source and introducing water into the sealing packing.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] The mill feed pipe sealing device of this utility model adopts a triple combination of wear-resistant flange contact radial seal, rubber sleeve contact axial seal, and short pipe bushing packing seal, which effectively improves the sealing effect. At the same time, since the short pipe of this utility model is a split and detachable structure, it is not necessary to disassemble and replace the feed straight pipe when the feed seal fails. The maintenance time for each replacement can be shortened to about 6-24 hours, which can significantly improve the operation rate. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 A schematic diagram of the annular opening butt joint structure of the rubber sleeve;

[0017] Figure 3 for Figure 2 Side view;

[0018] Figure 4 for Figure 2 Enlarged view of part A;

[0019] Figure 5 A schematic diagram of a structure with AMNH as the mating surface of two semi-circular hollow bushings;

[0020] Figure 6 for Figure 5 AE sectional view;

[0021] Figure 7 A schematic diagram of a structure with the joint surface of two semi-circular short pipes as CDMN;

[0022] Figure 8 for Figure 7 CA section view;

[0023] Figure 9 for Figure 7 Side view. Detailed Implementation

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] like Figure 1 As shown, this utility model discloses a mill feed pipe sealing device, including a feed pipe 1 and a feed bushing 2 sleeved on the feed pipe 1. The device is characterized by further including a sealing component, which comprises a wear-resistant flange 3, a rubber sleeve 4, and a short pipe shaft sleeve packing seal assembly. The wear-resistant flange 3 is sleeved on the feed pipe 1 in contact, with its inner end face close to the feed bushing 2. The wear-resistant flange 3 is made of resin or rubber flexible material, forming an integral wear-resistant flange or two semi-circular wear-resistant flanges joined together, thus forming the first wear-resistant flange contact radial seal.

[0026] The wear-resistant flanges of this utility model are connected by cutting a beveled section at the joint of one half-circle wear-resistant flange and cutting a corresponding beveled section on the other half-circle wear-resistant flange. The two are then fixedly connected to form an integral wear-resistant flange 3 by quick-drying adhesive.

[0027] like Figures 2-4 As shown, the rubber sleeve 4 of this utility model is axially sleeved onto the feed pipe 1 in a contact manner, and the inner end face of the rubber sleeve 4 abuts against the outer end face of the wear-resistant flange 3; the rubber sleeve 4 use Materials with good wear resistance and toughness, such as resin or rubber, can be used to make solid integral structural sleeves, or split butt-joint structural sleeves, or annular open butt-joint structural sleeves. ， If a split-type butt-joint structure rubber sleeve is used, a connecting plate is provided on the outer end face circumferentially. After the two split-type rubber sleeves are butt-jointed on the feed pipe, the connecting plates of the two split-type rubber sleeves are butt-jointed and fixedly connected by bolt assembly.

[0028] If a ring-shaped open butt-joint structure rubber sleeve is used, threaded holes 41 are designed at both ends of the opening. After the ring-shaped open butt-joint structure rubber sleeve is fitted onto the feed straight pipe 1, a steel connecting plate 43 is used to fasten it to the two threaded holes with matching bolts 42, so that the ring-shaped open butt-joint structure rubber sleeve is connected to form a complete ring rubber sleeve 4. A certain pressure between the rubber sleeve and the wear-resistant flange end face forms a second rubber sleeve contact axial seal, controlling the small amount of mineral particles and slurry water that leaks out from the wear-resistant flange contact radial seal. In the figure, the NM surface is the mating surface of the ring-shaped open butt-joint structure rubber sleeve connection.

[0029] like Figures 5-9As shown, the short pipe bushing packing sealing assembly of this utility model includes a short pipe 51, a bushing 52, a sealing packing 53, and a flange packing gland 54. The bushing is a hollow bushing 52 with a shoulder boss 521, which is fixedly sleeved on the feed pipe 1, preventing it from rotating circumferentially and moving axially. The inner end face of the hollow bushing 52 is in contact with the outer end face of the rubber sleeve 4. This effectively prevents the passage of slurry and small particles in the mill, and there is no risk of spillage. Figure 5 A schematic diagram of the structure of two semi-circular hollow bushings with AMNH mating surfaces is shown. The cross-sections of AE and AC at all angles are identical, representing a sectional view of the welded integral bushing. An outer chamfer 526 is provided along the axial direction of the AH mating surface as a pre-reserved welding bevel, typically welded on-site. The short connecting pipe 51 consists of two detachable semi-circular short connecting pipes with high flanges 511 and low flanges 512 at their top left and right ends respectively. These are symmetrically fitted onto the outside of the hollow bushing 52 and the rubber sleeve 4, with the mating surfaces 6 of the two semi-circular short connecting pipes 51 aligned. They are joined together by bolts 7 or welded to form a single integral short connecting pipe. The sealing packing 5... 3. The shoulder boss 521 of the bushing is wrapped around the outer edge and fills the radial gap between the short pipe 51 and the hollow bushing 52. The flange packing gland 54 is set at the outer end of the low flange 512 of the short pipe and the sealing packing 53. The inner edge is fitted on the hollow bushing 52, and the outer end of the hollow bushing extends out of the flange packing gland. The flange packing gland is used to apply axial clamping force to the sealing packing and press the sealing packing tightly onto the shoulder boss at the innermost side of the bushing. The high flange end of the short pipe with the shoulder boss is fixedly connected to the feed bushing together with the wear-resistant flange through a bolt assembly. The low flange end of the short pipe is fixedly connected to the flange packing gland through a bolt assembly.

[0030] The flange packing gland 54 is located on the right side of the low flange of the short pipe and at the outer end of the sealing packing 53. It is used to apply axial clamping force to the sealing packing 53, tightly pressing the sealing packing 53 onto the innermost shoulder boss 521 of the bushing, and radially expanding the radial gap between the bushing and the short pipe. The high flange 511 end of the short pipe is fixedly connected to the feed bushing 2 together with the wear-resistant flange 3 through a bolt assembly. The low flange 522 end of the short pipe is fixedly connected to the flange packing gland 54 through a bolt assembly, forming a third seal.

[0031] Since the sealing packing 53 is installed inside the short pipe and wraps around the outer edge of the bushing 52 several times, it is used to seal the trace amount of slurry that breaks through the aforementioned two seals and flows out of the rubber sleeve. The flange packing gland 54 can be designed as a whole. Due to its simple structure and small wall thickness, it can be divided and installed on site when a split structure is required. It can even be cut and molded on site using steel plates without affecting the performance.

[0032] As a further description of the above technical solution: This utility model provides an axial packing water seal pipe hole 522 on the hollow bushing with a shoulder boss 521. An outer end inlet 523, an inner end radial outlet 524, and an axial outlet 525 are provided axially or radially on the packing water seal pipe hole 522. The packing water pipe hole refers to an axial water seal pipe hole designed on the bushing. The outer end inlet 523 of the packing water pipe hole is located outside the packing gland and is used to connect to an external sealing packing water source and to introduce water into the inner side of the sealing packing. Water seal water fills the space between the rubber sleeve 4 and the sealing packing 53. Since mill ore leakage is due to slight self-pressure, maintaining a certain water pressure is sufficient to ensure the sealing effect. In addition, the water seal water also has a certain cooling and lubricating effect on the wear of the rubber sleeve 4.

[0033] After the mill sealing device has been worn for a certain period of time, the slurry that flows out through the gap between the wear-resistant flange and the rubber sleeve is blocked inside by the high-pressure packing water and packing line, and cannot flow out, thus achieving the packing sealing effect. The packing can be inspected, adjusted and replaced as appropriate according to the usage.

[0034] The aforementioned split-type feed pipe sealing device can be partially or completely replaced when the seals wear to their limit or become faulty. Since partial seal replacement is quick and can often be performed concurrently with other maintenance tasks such as liner replacement, the impact on mill uptime during maintenance of the split-type feed pipe sealing device (excluding complete replacement) is minimal. It can typically operate for one year or more before requiring complete replacement. Compared to the integral feed pipe sealing device, this saves significant maintenance time and provides greater flexibility in terms of maintenance quality and operational plans.

[0035] It should be noted that in this article, the terms "upper", "lower", "left", and "right" are used for descriptive purposes only and should not be construed as indicating or implying relative importance, nor should they be construed as implicitly indicating the number of technical features indicated.

Claims

1. A mill feed pipe sealing device, comprising a feed pipe and a feed bushing sleeved on the feed pipe, characterized in that: It also includes sealing components, which include a wear-resistant flange, a rubber sleeve, and a short pipe bushing packing seal assembly. The wear-resistant flange is fitted onto the feed pipe in a contact manner, with its inner end face close to the feed bushing. The rubber sleeve is fitted onto the feed pipe in a contact manner, with its inner end face abutting against the outer end face of the wear-resistant flange. The short-tube bushing packing seal assembly includes a short tube, a bushing, a sealing packing, and a flange packing gland. The bushing is a hollow bushing with a shoulder boss, fixedly fitted onto the feed pipe, with the inner end face of the hollow bushing abutting against the outer end face of the rubber sleeve. The short tube consists of two detachably assembled semi-circular short tubes with high and low flanges at their top left and right ends respectively, symmetrically fitted onto the outside of the hollow bushing and the rubber sleeve, with the mating surfaces of the two semi-circular short tubes aligned. They are joined together by bolts or welding to form a single short tube. The sealing packing is wound around the bushing. The outer edge of the shoulder boss is filled with the radial gap between the short pipe and the bushing. The flange packing gland is set at the outer end of the low flange of the short pipe and the sealing packing. The inner edge is fitted on the hollow bushing, and the outer end of the hollow bushing extends out of the flange packing gland. The flange packing gland is used to apply axial clamping force to the sealing packing, pressing the sealing packing tightly onto the innermost shoulder boss of the bushing. The high flange end of the short pipe with the shoulder boss is fixedly connected to the feed bushing together with the wear-resistant flange through a bolt assembly. The low flange end of the short pipe is fixedly connected to the flange packing gland through a bolt assembly.

2. The mill feed pipe sealing device according to claim 1, characterized in that: The wear-resistant flange is made of resin or rubber flexible material, and is either an integral wear-resistant flange or a wear-resistant flange made of two half-circle wear-resistant flanges joined together.

3. The mill feed pipe sealing device according to claim 2, characterized in that: The wear-resistant flanges that are joined together are made by cutting a beveled section at the joint of one half of the wear-resistant flange and cutting a corresponding beveled section on the other half of the wear-resistant flange. The two are then fixedly connected to form an integral wear-resistant flange using quick-drying adhesive.

4. The mill feed pipe sealing device according to claim 1, characterized in that: The aforementioned sleeve can be a solid integral structure sleeve, a split-type butt joint structure sleeve, or a ring-shaped open butt joint structure sleeve. If a split-type butt joint structure sleeve is used, a connecting plate is provided circumferentially on the outer end face. After being butt jointed onto the feed pipe, the connecting plates of the two split-type sleeves are butt jointed and then fixedly connected by a bolt assembly. Alternatively, a ring-shaped open butt joint structure sleeve can be used, with threaded holes designed at both ends of the opening. After the ring-shaped open butt joint structure sleeve is fitted onto the feed straight pipe, a steel connecting plate is used to fasten the two threaded holes with matching bolts to connect the ring-shaped open butt joint structure sleeve into a complete ring sleeve.

5. The mill feed pipe sealing device according to claim 1, characterized in that: The bushing can be an integral bushing or a split bushing. If the bushing is a split bushing, a gap or chamfer is provided at the connection point of the two mating split bushings, or a connecting plate is provided at the connection point. The two split bushings are fixedly connected by welding or bolt assembly.

6. The mill feed pipe sealing device according to claim 1, characterized in that: The hollow bushing with shoulder boss is provided with an axial packing water seal pipe hole. The packing water seal pipe hole is provided with an outer end water inlet, an inner end radial water outlet and an axial water outlet in the axial or radial direction, for connecting to the external sealing packing water source and introducing water into the sealing packing.

Images