Sealing structure for pull rod of coal mill

Abstract

The utility model provides a coal mill pull rod sealing structure, and relates to the technical field of coal mill machinery, the coal mill pull rod sealing structure comprises an upper sealing assembly, and the upper sealing assembly comprises a pull rod base fixedly connected to a machine room; the pressing plate is fixedly connected to the pull rod base, the two ends of the pressing plate are open, and a first cavity is formed between the openings in the two ends of the pressing plate; the first cavity is filled with the bottom end of the inner slag stopper, and the bottom end of the inner slag stopper is clamped with the top end of the pressing plate; the outer slag stopping piece is arranged on the periphery of the inner slag stopping piece in a sleeving mode, the two ends of the outer slag stopping piece are open, the openings in the two ends of the outer slag stopping piece form a second cavity, and the top of the inner slag stopping piece is located in the second cavity; and the sealing ring is clamped at the top opening of the outer slag stopper, the sealing structure can tightly hold the pull rod, and the sealing performance of the pull rod is not affected under the condition that the air pressure of the coal mill is low.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mill machinery, in particular to a tie rod sealing structure for a coal mill. Background Art

[0002] The hydraulic variable loading system of the coal mill is an important part of the medium-speed coal mill. It is composed of high-pressure oil pump station, oil pipeline, accumulator, loading cylinder, tie rod and other components. The hydraulic system provides the grinding roller with grinding pressure that varies with the load. The coal mill tie rod is the main equipment of the coal mill loading system and is very important in the system. The coal mill tie rod, also known as the coal mill loading rod, is located in a working area with high dust concentration and high tensile stress, and has high requirements for sealing. At present, sealing wind (gas seal) and sealing mechanical structure are often used to jointly achieve sealing at the tie rod. The coal mill tie rod in the prior art often has the problem of poor sealing effect when the wind pressure of the sealing wind is low. Utility Model Content

[0003] The utility model aims to overcome the defects of the prior art and provides a coal mill tie rod sealing structure, which solves the problem that when the coal mill sealing wind pressure is insufficient, coal powder is easily backflowed into the lower sealing structure, causing leakage of the lower seal.

[0004] In order to achieve the above purpose and other purposes, the utility model is implemented by including the following technical solutions: the utility model provides a coal mill tie rod sealing structure, the coal mill tie rod sealing structure includes: a tie rod, which is arranged through one side of the machine compartment; a lower sealing assembly, which is penetrated by the tie rod and arranged at the bottom end of the machine compartment, the lower sealing assembly includes a lower sealing base, a lower sealing shell and a sealing core, the lower sealing shell is fixedly connected to the lower sealing base, and the sealing core is located in a lower sealing cavity surrounded by the lower sealing base and the sealing core; and an upper sealing assembly, which is penetrated by the tie rod and arranged The top of the machine bin; wherein the upper sealing assembly includes: a pull rod base, fixedly connected to the machine bin; a pressure plate, fixedly connected to the pull rod base, the pressure plate having openings at both ends, forming a first cavity between the openings at both ends of the pressure plate; an inner slag stop, the bottom end of the inner slag stop fills the first cavity and forms an engagement with the top of the pressure plate; an outer slag stop, sleeved on the outer periphery of the inner slag stop, the outer slag stop having openings at both ends, the openings at both ends of the outer slag stop form a second cavity, and the top of the inner slag stop is located in the second cavity; and a sealing ring, the sealing ring is engaged at the top opening of the outer slag stop.

[0005] In one embodiment, the internal slag blocking member includes a first baffle and a second baffle, the second baffle is located on the first baffle, a first slot is reserved between the first baffle and the second baffle, the top end of the pressure plate is inserted into the first slot, and the first baffle is filled in the first cavity.

[0006] In one embodiment, the inner slag blocking member is further provided with a guide column above the second baffle.

[0007] In one embodiment, the top of the guide column has a first truncated cone structure.

[0008] In one embodiment, an outer diameter of the first baffle is smaller than an outer diameter of the second baffle.

[0009] In one embodiment, the bottom of the outer slag blocking member is arranged on the second baffle plate, and the guide column is located in the second cavity of the outer slag blocking member.

[0010] In one embodiment, the upper surface of the second baffle plate has a second frustum structure, and the bottom opening of the outer slag blocking member has a third frustum structure, and the third frustum structure is adapted to the second frustum structure.

[0011] In one embodiment, one end of the sealing ring covers the top opening of the outer slag blocking member, and the other end of the sealing ring is located in the second cavity of the outer slag blocking member.

[0012] In one embodiment, the pressing plate includes a first pressing plate and a second pressing plate, and the top ends of the first pressing plate and the second pressing plate are respectively engaged with the bottom ends of the inner slag blocking member.

[0013] In one embodiment, the sealing structure further includes a limiting ring, which is sleeved on the pull rod and located above the sealing ring.

[0014] In one embodiment, a first gap is provided between the pull rod and the pull rod base and the inner slag stopper, a second gap is provided between the inner slag stopper and the outer slag stopper, and a third gap is provided between the inner slag stopper and the pressure plate in the vertical direction.

[0015] The utility model provides a tie rod sealing structure for a coal mill. Compared with the prior art, the utility model has the following beneficial effects: the sealing structure described in the utility model is a duplex sealing structure, which can tightly hold the tie rod, and does not affect the tie rod sealing when the wind pressure of the coal mill is low, thereby effectively blocking the coal slag and coal powder in the coal mill from entering the sealing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Shown is a cross-sectional view of the sealing structure of the present invention.

[0017] Figure 2 It is a schematic diagram of the structure of a pressing plate in one embodiment of the utility model.

[0018] Figure 3 It is a schematic diagram of the structure of a pressing plate in one embodiment of the utility model.

[0019] Figure 4 It is a schematic diagram of the structure of the inner slag retainer in one embodiment of the utility model.

[0020] Figure 5 It is a schematic diagram of the structure of a pressing plate in one embodiment of the utility model.

[0021] Figure 6 It is a schematic diagram of the structure of the outer slag retainer in one embodiment of the utility model.

[0022] Figure 7 It is a schematic diagram of the structure of the outer slag retainer in one embodiment of the utility model. DETAILED DESCRIPTION

[0023] See also Figures 1 to 7 The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and functions of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0024] like Figure 1 As shown, the utility model provides a coal mill tie rod sealing structure, which is arranged on one side of the coal mill machine chamber 100, and the sealing structure includes a lower sealing component 2, which is arranged at the bottom end of the machine chamber 100, and the upper sealing component 3 is arranged at the top end of the machine chamber 100, and the tie rod 1 passes through the upper sealing component 3 and the lower sealing component 2 from top to bottom.

[0025] like Figure 1 As shown, the lower sealing assembly 2 includes a lower sealing base 21, a lower sealing shell 22 and a sealing core 23. The lower sealing shell 22 is fixedly connected to the lower sealing base 21. The lower sealing shell 22 and the lower sealing base 21 form a lower sealing cavity 22a. A sealing core 23 is arranged in the lower sealing cavity 22a. Both ends of the sealing core 23 abut against the cavity wall of the lower sealing cavity 22a. The sealing core 23 is wear-resistant rubber.

[0026] like Figure 1 and Figure 2 , Figure 3As shown, the upper sealing assembly 3 includes a rod base 31 extending from the upper part of the nacelle 100, the rod base 31 is a hollow cylindrical structure, the bottom end of the rod base 31 is fixedly connected to the nacelle 100, and the upper sealing assembly 3 includes a pressing plate 32, the pressing plate 32 can be cylindrical or cubic, but not limited thereto. The pressing plate 32 has openings (32a, 32b) at both ends, namely, a top opening 32a and a bottom opening 32b, the pressing plate 32 is fixedly connected to the rod base 31, and the pressing plate 32 forms a first cavity 32c between the openings (32a, 32b).

[0027] like Figure 2 As shown, in order to fix the pressing plate 32 on the pull rod base 31, the pressing plate 32 is further provided with mounting holes 32d, and the number of the mounting holes 32d may be, for example, 4 or 6.

[0028] like Figure 1 and Figure 3 as well as Figure 4 As shown, the upper sealing assembly 3 includes an inner slag stop 33, and the inner slag stop 33 includes a first baffle 33a, a second baffle 33b and a guide column 33c. The second baffle 33b is located on the first baffle 33a, and a first slot A is reserved between the first baffle 33a and the second baffle 33b. The top of the pressure plate 32 is inserted into the first slot A, and the first baffle 33a is filled in the first cavity 32c. The inner slag stop 33 is also provided with a guide column 33c above the second baffle 33b. The top of the guide column 33c has a first conical structure S1, and the outer diameter of the first conical structure S1 gradually decreases along the rising direction of the pull rod 1. The first conical structure S1 has a certain slope to facilitate the diversion of the sealing gas.

[0029] like Figure 4 As shown, further, the outer diameter of the first baffle 33a is smaller than the outer diameter of the second baffle 33b, so that the coal powder can be prevented from flowing into the lower sealing assembly 2 from the gap at the pressure plate 32 to cause sealing failure.

[0030] like Figure 4 As shown, further, the upper surface of the second baffle plate 33b has a second truncated cone structure S2, which can make the upper surface of the second baffle plate 33b have a certain slope, and the first truncated cone structure S1 and the second truncated cone structure S2 can facilitate the guidance of the sealing gas and reduce the friction when the pull rod moves up and down.

[0031] like Figure 5To facilitate installation of the pressure plate 32 and the inner slag stop 33, the pressure plate 32 may include a first pressure plate 321 and a second pressure plate 322. During installation, the first pressure plate 321 and the second pressure plate 322 may be engaged in the first slot A of the inner slag stop 33, and then the pressure plate 32 may be fixed to the pull rod base 31 with bolts through the mounting holes 32d.

[0032] like Figure 1 and Figure 6 , Figure 7 As shown, the upper sealing assembly includes an outer slag stop 34, which is sleeved on the outer periphery of the inner slag stop 33, and both ends of the outer slag stop 34 also have openings (34a, 34b), namely a top opening 34a and a bottom opening 34b, and a second cavity 34c is formed between the openings. The bottom of the outer slag stop 34 is arranged on the second baffle 33b, and the bottom opening 34b of the outer slag stop 34 has a third truncated cone structure S3, and the third truncated cone structure S3 is adapted to the second truncated cone structure S2, namely the bottom of the outer slag stop 34 and the slope of the top surface of the second baffle 33b are adapted, and the top of the inner slag stop 33 is located in the second cavity 34c, for example, the guide column 33c is located in the second cavity 34c of the outer slag stop 34, and the structure of the outer slag stop 34 is similar to that of the pressure plate 32. Specifically, the height of the outer slag stop 34 is greater than the height of the pressure plate 32.

[0033] like Figure 1 and Figure 6 As shown, the upper sealing member 3 includes a sealing ring 35, and the sealing ring 35 is located above the guide column 33c. The sealing ring 35 can be a flexible sealing ring, for example, made of rubber. One end of the sealing ring 35 covers the top opening 34a of the outer slag stop member 34, and the other end of the sealing ring 35 is located in the second cavity 34c of the outer slag stop member 34. A second groove 35a is formed between the two ends of the sealing ring 35, and the second groove 35a is engaged with the top of the outer slag stop member 34, that is, it is engaged at the top opening 34a of the outer slag stop member 34 to form a seal.

[0034] like Figure 1 As shown, the sealing structure further includes a limiting ring 4, which is sleeved on the pull rod 1 and located above the sealing ring 35. The limiting ring 4 can prevent the outer slag blocking member 34 from shifting as the pull rod 1 swings up and down.

[0035] like Figure 1 As shown, the wind direction of the sealing wind of the utility model can enter the sealing structure from the wind duct on one side of the pull rod base 31, such as Figure 1As shown by the arrows, specifically, there is a first gap G1 between the pull rod 1 and the pull rod base 31 and the inner slag stop 33, and a second gap G2 between the inner slag stop 33 and the outer slag stop 34. The sealed wind can enter the first gap G1 along the direction of the arrow and then go around the guide column 33c to the second gap G2 to be discharged from the sealing structure. Furthermore, the top of the guide column 33c and the sealing ring 35 are not in contact. Due to the reasonable gap between the inner and outer slag stops, fine fly ash and coal slag can be prevented from entering the sealing structure.

[0036] Furthermore, the width of the first gap G1 is 4-5 mm, and the width of the second gap G2 is less than or equal to 2 mm. The flow path design of the sealing air ensures that the rod sealing air can pass smoothly, ensures the use effect of the rod sealing, and prolongs the service life of the rod sealing.

[0037] In some embodiments, the inner slag stop 33 can move left and right between the pressure plates 32, so that the inner slag stop 33 can swing with the swing of the pulling cylinder 100, that is, there is a third gap G3 between the inner slag stop 33 and the pressure plate 32 in the vertical direction, and the width of the third gap G3 can be 15 to 20 mm.

[0038] Therefore, the utility model effectively overcomes various shortcomings in the prior art and has a high industrial utilization value. The above embodiments are only illustrative of the principles and effects of the utility model, and are not used to limit the utility model. Anyone familiar with this technology can modify or change the above embodiments without violating the spirit and scope of the utility model. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the relevant technical field without departing from the spirit and technical ideas disclosed by the utility model should still be covered by the claims of the utility model.

Claims

1. A rod sealing structure for a coal mill, wherein the coal mill has a machine chamber, and wherein: The sealing structure comprises: A pull rod is provided through one side of the cabin; A lower sealing assembly, which is penetrated by the pull rod and arranged at the bottom end of the cabin, wherein the lower sealing assembly comprises a lower sealing base, a lower sealing shell and a sealing core, wherein the lower sealing shell is fixedly connected to the lower sealing base, and the sealing core is located in a lower sealing cavity surrounded by the lower sealing base and the sealing core; and an upper sealing assembly, which is penetrated by the pull rod and arranged at the top of the cabin; Wherein, the upper sealing assembly comprises: A pull rod base, fixedly connected to the cabin; A pressing plate, fixedly connected to the pull rod base, with openings at both ends of the pressing plate, and a first cavity formed between the openings at both ends of the pressing plate; An inner slag blocking member, the bottom end of which fills the first cavity and is engaged with the top end of the pressing plate; An outer slag blocking member is sleeved on the outer periphery of the inner slag blocking member, the two ends of the outer slag blocking member are open, the two ends of the outer slag blocking member are open to form a second cavity, and the top of the inner slag blocking member is located in the second cavity; and a sealing ring, wherein the sealing ring is engaged at the top opening of the outer slag blocking member.

2. The coal mill rod sealing structure according to claim 1, characterized in that: The inner slag blocking member includes a first baffle and a second baffle, the second baffle is located on the first baffle, a first slot is reserved between the first baffle and the second baffle, the top end of the pressure plate is inserted into the first slot, and the first baffle is filled in the first cavity.

3. The coal mill rod sealing structure according to claim 2, characterized in that: The inner slag blocking member is further provided with a guide column above the second baffle.

4. The coal mill rod sealing structure according to claim 3, characterized in that: The top of the guide column has a first truncated cone structure.

5. The coal mill rod sealing structure according to claim 2, characterized in that: An outer diameter of the first baffle is smaller than an outer diameter of the second baffle.

6. The coal mill rod sealing structure according to claim 3, characterized in that: The bottom of the outer slag blocking member is arranged on the second baffle plate, and the guide column is located in the second cavity of the outer slag blocking member.

7. The rod sealing structure of a coal mill according to claim 2, characterized in that: The upper surface of the second baffle plate has a second frustum structure, and the bottom opening of the outer slag blocking member has a third frustum structure, and the third frustum structure is adapted to the second frustum structure.

8. The rod sealing structure of a coal mill according to claim 1, characterized in that: One end of the sealing ring covers the top opening of the outer slag blocking member, and the other end of the sealing ring is located in the second cavity of the outer slag blocking member.

9. The rod sealing structure of a coal mill according to claim 1, characterized in that: The pressing plate includes a first pressing plate and a second pressing plate, and the top ends of the first pressing plate and the second pressing plate are respectively engaged with the bottom ends of the inner slag blocking member.

10. The rod sealing structure of a coal mill according to claim 1, characterized in that: A first gap is provided between the pull rod and the pull rod base and the inner slag stopper, a second gap is provided between the inner slag stopper and the outer slag stopper, and a third gap is provided between the inner slag stopper and the pressure plate in the vertical direction.

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