Sealing device for pull rod of coal mill

Abstract

The utility model is applicable to the technical field of sealing devices, and discloses a sealing device of a pull rod of a coal mill, which aims to solve the technical problem that the sealing device in the prior art cannot compensate the swing allowance of the pull rod, and comprises a pull rod shaft and a pull rod box body, an upper sealing assembly and a lower sealing assembly are arranged on the draw-bar shaft, the upper sealing assembly is mounted at an upper opening of the draw-bar box body, and the lower sealing assembly is mounted at a lower opening of the draw-bar box body; the upper sealing assembly comprises a protection conical cap, a first connecting plate and a second connecting plate, openings are formed in the two ends of the protection conical cap, the first connecting plate and the second connecting plate are combined and matched with the protection conical cap, a certain gap is formed between the first connecting plate and the second connecting plate and the protection conical cap in the radial direction, and therefore the requirement for radial swing of the pull rod can be met; the sealing effect can be effectively achieved when the pull rod swings in the radial direction, normal three-dimensional swinging of the pull rod is guaranteed, and meanwhile the pull rod cannot be damaged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of sealing device, in particular to a sealing device of coal mill pull rod. BACKGROUND

[0002] Medium speed roller disc type coal mill is driven by motor through speed reducer, the rotation of mill disc drives three mill rollers which are 120° apart to rotate passively, raw coal falls into mill disc surface through coal inlet pipe, under the action of centrifugal force, raw coal moves along the radial direction to mill disc periphery and enters mill disc roller evenly, and the pressure of grinding is supplied by another hydraulic device through loading frame and pull rod, and the pull rod is extended from the closed medium speed roller disc type mill to connect the piston rod in hydraulic cylinder. At this time, the pull rod is displaced up and down, and also swings radially at an angle of 12-15°. The existing pull rod is made of rigid material, the sealing element is in high-temperature coal dust environment, the pull rod moves in multiple directions, and coal powder often leaks and the pull rod is often worn, thereby reducing production efficiency.

[0003] The existing sealing technology usually adopts metal end face sealing structure or metal shell, the inside is flexible sealing device, the bottom of the pull rod box is not sealed, and the sealing device cannot compensate the swing allowance of the pull rod, and if the flexible sealing device is used, the service life is short in high-temperature environment, and the flexible sealing device cannot be used for a long time. SUMMARY

[0004] The utility model aims at overcoming the insufficient of prior art, and provides a sealing device of coal mill pull rod, which aims at solving the technical problem that the sealing device cannot compensate the swing allowance of the pull rod in prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a sealing device of coal mill pull rod, which comprises a pull rod shaft and a pull rod box body, the pull rod shaft is arranged in the pull rod box body, the pull rod shaft is provided with upper sealing assembly and lower sealing assembly, wherein the upper sealing assembly is installed at the opening of the pull rod box body, and the lower sealing assembly is installed at the lower opening of the pull rod box body.

[0006] The upper sealing assembly comprises a protective cone cap, a first connecting plate and a second connecting plate, the protective cone cap is provided with an opening at both ends, wherein the upper opening is provided with a colloidal sealing element, and the lower opening is sleeved on the pull rod shaft, the colloidal sealing element is closely combined with the pull rod shaft, the first connecting plate and the second connecting plate are connected with each other to form a combined element, the combined element and the protective cone cap are engaged with each other, and the combined element and the protective cone cap are movably connected.

[0007] As preferred, the outer periphery of the protective cone cap is also provided with a swing chamber, wherein the first connecting plate is inside the swing chamber, and at least two bolt holes are formed on the combination of the swing chamber and the first connecting plate, and bolts are installed on the bolt holes for fixing the combination.

[0008] As preferred, the colloid seal is in gapless contact with the pull rod shaft, and the contact sealing surface is always shaped by the high-temperature-resistant permanent magnetic structure to form a sealing cavity.

[0009] As preferred, a copper sleeve cover plate is arranged at the opening of the protective cone cap, and a copper sleeve is arranged on the colloid seal, the copper sleeve is sleeved on the pull rod shaft, and the copper sleeve cooperates with the copper sleeve cover plate.

[0010] As preferred, the lower sealing assembly comprises an upper sealing block and a lower sealing block, and the upper sealing block and the lower sealing block are sleeved on the pull rod shaft and abut against each other to form a complete sealing structure.

[0011] As preferred, a sealing ring groove is formed on the outer periphery of the sealing structure, and the inner and outer edges on both sides of the sealing ring groove extend upward to form an inner sealing lip and an outer sealing lip, wherein the inner sealing lip is attached to the pull rod shaft, and the outer sealing lip extends the groove depth of the sealing ring groove.

[0012] Compared with the prior art, the sealing device for the pull rod of the coal mill has the following beneficial effects:

[0013] 1. The first connecting plate and the second connecting plate are combined, the protective cone cap is matched, and there is a certain gap in the radial direction between the protective cone cap, so that the radial swing of the pull rod can be met, that is, the sealing effect can be effectively achieved when the pull rod swings in the radial direction, the pull rod can normally swing in three dimensions, and the pull rod is not damaged.

[0014] 2. The gapless contact sealing between the pull rod shaft and the colloid seal effectively forms a sealing cavity, and prevents the accelerated wear caused by the invasion of coal powder.

[0015] 3. The lower sealing assembly effectively improves the sealing property of the lower metal alloy sealing structure of the pull rod shaft, and prolongs the service life of the sealing element.

[0016] The characteristics and advantages of the utility model will be described in detail by combining the embodiments with the drawings. DRAWINGS

[0017] Figure 1 is a perspective view of the embodiment of the utility model.

[0018] Figure 2 is a half-sectional view of the embodiment of the utility model.

[0019] Figure 3 is an embodiment of the present application Figure 2 is an enlarged view of A in the middle.

[0020] wherein:

[0021] 10 - pull rod shaft; 20 - colloidal seal; 21 - copper sleeve; 22 - protective cone cap; 23 - swing chamber; 24 - first connecting plate; 25 - second connecting plate; 26 - copper sleeve inner groove; 27 - copper sleeve cover plate; 18 - bolt hole; 30 - upper sealing block; 31 - lower sealing block. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the present application more clear and explicit, the following will further describe the present application by means of the drawings and examples. However, it should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the scope of the present application. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present application.

[0023] In the description of the present application, it should be noted that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0024] In the description of the present application, it should be noted that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the invention is usually placed, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the invention. In addition, the terms "first", "second", "third", and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0025] In the description of the utility model, still need explaining, unless another explicit provision and limitation, term "arrange", "install", "link", "connect" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electrical connection, can be direct connection, also can be indirectly connected through intermediate medium, can be two element internal communication. For ordinary skilled in the art, can understand the specific meaning of the above-mentioned term in the application according to specific circumstances.

[0026] Reference Figures 1-3 The utility model discloses a kind of sealing devices of coal mill pull rod, including pull rod shaft 10 and pull rod box, pull rod shaft 10 is arranged inside pull rod box, upper sealing assembly and lower sealing assembly are provided on pull rod shaft 10, wherein upper sealing assembly is installed in pull rod box upper opening, lower sealing assembly is installed in pull rod box lower opening, upper sealing assembly is arranged between the upper portion of pull rod box and pull rod shaft 10, and lower sealing assembly is arranged between the lower portion of pull rod box and pull rod shaft 10, upper sealing assembly and lower sealing assembly are formed between pull rod box and pull rod shaft 10 with one sealed air chamber, when coal mill works, sealed air chamber is blown into by sealing air, air pressure compensation is carried out to hot air in coal mill, to prevent coal powder from leaking under the action of hot air, by the sealing form, it can reduce the wear between pull rod shaft 10 and the elastomer of upper sealing assembly and the elastomer of lower sealing assembly, and effectively prevent the occurrence of powder leakage phenomenon;

[0027] Upper sealing assembly includes protective cone cap 22, first connecting plate 24 and second connecting plate 25, protective cone cap 22 both ends are provided with opening, wherein upper opening is installed with colloid seal 20, lower opening is sleeved on pull rod shaft 10, colloid seal 20 is closely combined with pull rod shaft 10, first connecting plate 24 and second connecting plate 25 are connected to form a combined component, the combined component is engaged with protective cone cap 22, and the combined component is movably connected with protective cone cap 22, swing chamber 23 is further formed in the outer circumferential side of protective cone cap 22, first connecting plate 24 is in swing chamber 23, at least two bolt holes 18 are formed in the combined component formed by swing chamber 23 and first connecting plate 24, bolts are installed on bolt holes 18, for fixing the combined component, there is a certain gap between the combined component and protective cone cap 22 in radial direction, can satisfy the radial swing of pull rod shaft, i.e. when pull rod shaft swings in radial direction, can also effectively play a sealing effect, ensure that pull rod shaft can normally swing in three dimensions, and also will not damage pull rod shaft.

[0028] Colloid seal 20 and pull rod shaft 10 are in gapless contact, and its contact sealing surface is always kept shaped by high-temperature-resistant permanent magnetic structure, forms a sealed cavity, ensures that the inside wind pressure is always higher than the outside wind pressure, avoids coal powder from leaking to the outside of coal mill through dynamic and static combination parts, ensures that the surrounding of coal mill is clean and tidy.

[0029] The copper sleeve cover plate 27 is arranged on the opening of the protection cone cap 22, and the copper sleeve 21 is arranged on the rubber sealing element 20, and the copper sleeve inner groove 26 is arranged in the copper sleeve 21, the copper sleeve 21 is sleeved on the pull rod shaft 10, the copper sleeve cover plate 27 can be embedded in the copper sleeve inner groove 26, and the copper sleeve cover plate 27 and the copper sleeve 21 are matched with each other, so that the copper sleeve cover plate 27 can be used for preliminarily blocking foreign matters such as powder leakage from the outside.

[0030] The lower sealing assembly comprises the upper sealing block 30 and the lower sealing block 31, both of which are made of double-floating metal alloy, the upper sealing block 30 and the lower sealing block 31 are sleeved on the pull rod shaft 10, and the upper sealing block 30 and the lower sealing block 31 abut against each other to form a complete sealing structure, the outer circumferential side of the sealing structure is provided with a sealing ring groove, the inner and outer edges of the two sides of the sealing ring groove extend to the upper side, respectively, to form an inner sealing lip and an outer sealing lip, the inner sealing lip is attached to the pull rod shaft 10, and the outer sealing lip extends the groove depth of the sealing ring groove, the lower part of the pull rod shaft 10 is further provided with a sealing base, the sealing base is internally provided with a sealing cavity, the sealing base is attached to the pull rod box body, and the lower sealing assembly is installed in the sealing cavity, so that the sealing property of the lower part of the metal alloy sealing structure of the pull rod shaft 10 is effectively improved, and the service life of the sealing element is prolonged.

[0031] The above only describes preferred embodiments of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement or improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A sealing device for a coal pulverizer tie rod, comprising a tie rod shaft (10) and a tie rod housing, the tie rod shaft (10) being disposed inside the tie rod housing, characterized in that: The pull rod shaft (10) is provided with an upper sealing assembly and a lower sealing assembly, wherein the upper sealing assembly is installed at the opening of the pull rod box, and the lower sealing assembly is installed at the lower opening of the pull rod box. The upper sealing assembly comprises a protective cone cap (22), a first connecting plate (24) and a second connecting plate (25), the protective cone cap (22) is provided with an upper opening and a lower opening at both ends, wherein the upper opening is provided with a gel seal (20), and the lower opening is sleeved on the pull rod shaft (10), the gel seal (20) is tightly attached to the pull rod shaft (10), the first connecting plate (24) and the second connecting plate (25) are connected to form an assembly, the assembly is engaged with the protective cone cap (22), and the assembly is movably connected with the protective cone cap (22).

2. A seal for a coal pulverizer tie rod as defined in claim 1 wherein: The outer circumferential side of the protective cone cap (22) is further provided with a swing chamber (23), wherein the first connecting plate (24) is inside the swing chamber (23), and the swing chamber (23) and the first connecting plate (24) form an assembly, at least two bolt holes (18) are formed in the assembly, and bolts are installed in the bolt holes (18) to fix the assembly.

3. A seal for a coal pulverizer tie rod as defined in claim 1 wherein: The gel seal (20) is in gapless contact with the pull rod shaft (10), and the contact sealing surface thereof is always maintained in a shaped state by a high-temperature-resistant permanent magnetic structure to form a sealed cavity.

4. A seal for a coal pulverizer tie rod as defined in claim 1 wherein: The upper opening of the protective cone cap (22) is further provided with a copper sleeve cover plate (27), and the gel seal (20) is further provided with a copper sleeve (21), the copper sleeve (21) is sleeved on the pull rod shaft (10), and the copper sleeve (21) cooperates with the copper sleeve cover plate (27).

5. A seal for a coal pulverizer tie rod as defined in claim 1 wherein: The lower sealing assembly comprises an upper sealing block (30) and a lower sealing block (31), the upper sealing block (30) and the lower sealing block (31) are sleeved on the pull rod shaft (10) and abut against each other to form a complete sealing structure.

6. A seal for a coal pulverizer tie rod as defined in claim 5 wherein: The outer circumferential side of the sealing structure is provided with a sealing ring groove, the inner and outer edges of the two sides of the sealing ring groove extend obliquely upward to form an inner sealing lip and an outer sealing lip, wherein the inner sealing lip is attached to the pull rod shaft (10), and the outer sealing lip extends the groove depth of the sealing ring groove.

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