JP3820090B2 - Vertical mill - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vertical mill that performs pulverization by biting an object to be pulverized into a gap between a rotary table and a roller.
[0002]
[Prior art]
As a kind of pulverizer for pulverizing limestone, slag, cement raw material, coal and the like, a vertical mill (pulverizer) as shown in FIG. 1 is widely used. The pulverizer 10 rotates a disk-shaped table 11 using a motor or the like as a driving force, and causes the object to be pulverized to bite between a plurality of rollers 12 that are rotatably installed on the outer peripheral upper surface thereof. In some cases, the processing capacity is about 10 t / h to 400 t / h.
[0003]
In other words, the material to be crushed is supplied to the center of the rotary table 11 from the raw material chute 13 disposed in the upper part of the pulverizer, and is dispersed in the outer peripheral direction by centrifugal force. At that time, it is caught between the roller 12 and the rotary table 11. To be crushed.
[0004]
The crusher 10 has a structure in which hot air is supplied from below the outer periphery of the table 11. Further, an attracting fan (not shown) is disposed on the powder discharge port side, and the inside of the mill is maintained at about -8 kPa (Gauge). Hot air is introduced from the outside of the mill by this negative pressure, and the pulverized product is blown upward. At this time, the coarsely pulverized material falls again on the table 11 and is pulverized. The powder blown up by the hot air is further classified by a classifier 14 disposed above the roller 12 and discharged from the upper part of the mill. At that time, the coarse powder falls onto the rotary table 11 and is pulverized again as described above. By introducing the hot air in this way, it is possible to simultaneously dry, pulverize, and classify the object to be crushed.
[0005]
Here, the structure of the roller 12 will be described with reference to FIG. FIG. 2 is an enlarged cross-sectional view schematically showing the periphery of the roller.
[0006]
The roller 12 mainly includes a roller boss 23 that is rotatably attached to a roller shaft 21 that is a fixed shaft via a rolling bearing 22, a roller tire 24 that is a consumable part attached on the outer periphery thereof, and a bearing. It is comprised by the sealing mechanism of a part. Hereinafter, these rotating parts are collectively referred to as a roller 12. In addition, in order to make the roller 12 part which is this rotation part intelligible, only the rotation part was shown with the oblique line in FIG.
[0007]
Since the inside of the pulverizer 10 has a high-concentration dust (dust) atmosphere due to the blown-up object to be crushed, it is required to lubricate the rolling bearing 22 using clean lubricating oil in this atmosphere. There is a need to protect the space around the bearings from dust.
[0008]
For this reason, the lid | cover which becomes the roller boss cover 25 is attached to the front end side of the roller boss 23, and the roller boss cover 26 is similarly attached to the rear end side of the roller boss 23 to protect the bearing portion.
[0009]
However, since there is a roller shaft 21 that does not rotate at the center of the roller 12, a sealing mechanism is provided so that dust in the mill does not enter the space around the bearing (that is, the space surrounded by the roller 12 and the roller shaft 21). It is necessary to provide it.
[0010]
In addition, the roller 12 vibrates violently due to the pulverization operation, and the rolling bearing 22 has some play, so the roller 12 and the roller shaft 21 vibrate relatively about 0.6 mm. For this reason, it is impossible to seal by setting the gap between the roller boss cover 26 and the fixed shaft side to 0, and a flexible sealing mechanism is required.
[0011]
[Problems to be solved by the invention]
In a conventional vertical mill that performs pulverization by biting an object to be pulverized into a gap between the rotary table 11 and the roller 12, a plurality of pieces as shown in FIG. 4 are used to prevent dust from entering the space around the bearing. A sealing mechanism is attached. FIG. 4 is a detailed view of part A in FIG. Moreover, in order to make the roller 12 part which is a rotation part intelligible, only the rotation part was shown with the oblique line in FIG.
[0012]
First, the roller boss cover 26 is set so as to make the gap W with the tip of the seal member 27 as small as possible. The seal member 27 is a part that is attached to an arm 28 that supports the roller shaft 21 and plays a role of preventing air from leaking into the mill by a mechanism that slides with the mill casing 29 (see FIG. 2).
[0013]
However, since the roller boss cover 26 and the seal member 27 are relatively vibrated, it is necessary to secure a gap W of, for example, about 1.5 mm, and prevent coarse powder from entering the space around the bearing. Is possible to some extent, but has little function to prevent fine powder from entering. Further, the gap W has a problem that wear tends to progress by biting coarse powder.
[0014]
Second, an annular member 41 called a seal ring is attached to the tip of the roller boss cover 26, and a wool felt between the annular member 41 and the roller shaft 21 is interposed between, for example, double ceramic packings 42. 43 has a sealing mechanism.
[0015]
However, in reality, the sealing mechanism may not be accurately arranged over the entire circumference of the roller shaft 21. Further, when the dust in the mill reaches this portion, the wear proceeds so as to bite it. In addition, oil leaking from the bearing portion may take away the flexibility of the wool felt 43, and it has been difficult to maintain the sealing function for a long time.
[0016]
Third, a seal mechanism called a mechanical seal 44 is disposed on the bearing side of the roller boss cover 26. This is because the two annular members 45 and 46 are pressed against each other in the axial direction (left and right direction in FIG. 4) by a spring or the like, so that the annular member 45 is pressed against the annular member 41 to keep the seal. Since the sealing is maintained even if the member is somewhat worn, the structure can be expected to have a long-term sealing effect.
[0017]
However, there are not a few examples in which the mechanical seal does not satisfy the practically required life. For example, in a vertical mill used in a raw material grinding process in cement production, the average life of a mechanical seal is about 7 months. In cement production, which is produced continuously and over a long period, these parts are disassembled at every rotation. There is a need for maintenance and replacement. At the same time, this means that the upstream seal mechanism (ie, the first and second seal mechanisms) is not functioning.
[0018]
Furthermore, since the rotating part (roller side) and the fixed part (roller shaft side) are relatively vibrating, the mechanical seal sliding surface does not maintain a good contact state, and the mechanical seal slides without vibration. There is a problem that the wear is severe compared to. This induces a problem that the worn metal powder of the mechanical seal is mixed into the lubricating oil of the bearing portion.
[0019]
An object of the present invention is to provide a vertical mill that can prevent dust from entering into a space around a bearing in a vertical mill, particularly a roller mill, and can operate continuously for a longer period of time.
[0020]
[Means for Solving the Problems]
The configuration of the present invention made to achieve the above object is as follows.
[0021]
  That is, the present invention relates to a vertical mill that performs pulverization by biting a material to be pulverized into a gap between a rotary table and a roller supported by a fixed shaft, and has a predetermined gap between the roller and the fixed shaft side. Is attached, and the sealing member isSeveral or more holes are provided as air inlets.Adjustable air leak amountNaComprising a member, and the pressure difference between the mill internal pressure and the atmospheric pressureAir inletA sealing mechanism is formed to allow air to flow from the gap to the space in the mill via the gap.
[0022]
The vertical mill of the present invention is further characterized as, "The sealing mechanism includes a labyrinth-shaped airway formed by an annular member attached to the roller side and an annular member attached to the fixed shaft side.TeOn the space sideAirIt is a mechanism for flowing.
[0023]
According to the vertical mill of the present invention, dust can be effectively prevented from entering the bearing portion side by flowing air in a direction opposite to the direction in which the dust in the mill enters the bearing portion side.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
The vertical mill of the present invention is a so-called roller mill that performs pulverization by biting an object to be pulverized into the gap between the rotary table and the roller. The basic configuration other than the sealing mechanism is, for example, FIG. 1 and FIG. It can be set as the structure similar to the vertical mill as shown in 2. FIG.
[0025]
The greatest feature of the present invention is through a predetermined gap formed between the roller portion that is the rotating portion and the roller shaft portion that is the fixed portion.Due to the differential pressure between the mill pressure and atmospheric pressureIt is in the point which provided the sealing mechanism which flows air into the in-mill space side.
[0026]
Embodiments of the present invention will be described below in detail with reference to the drawings.In the third to eighth embodiment examples, a description of a sealing mechanism for flowing pressurized air to the inner space of the mill is also provided for reference.
[0027]
(FirstreferenceExample)
  FIG. 6 is a partial cross-sectional view showing the sealing mechanism of the vertical mill of this example, and corresponds to FIG. 4 described above. In FIG. 6, the same members as those in FIG. 4 are denoted by the same reference numerals.
[0028]
The seal mechanism of this example is different from the configuration of FIG. 4 described above in that an air suction port 61 is formed at a predetermined position of a seal member 27 attached to the fixed shaft (roller shaft 21) side.
[0029]
The seal member 27 is fixed to the roller shaft 21 via the arm 28, and is disposed with a gap W from the roller boss cover 26.
[0030]
As described above, since the roller boss cover 26 and the seal member 27 are relatively vibrated, it is necessary to secure the gap W of about 1.5 mm. Further, since the space in the mill is a high-concentration dust atmosphere due to the material to be crushed, fine powder is introduced into the space surrounded by the roller 12 and the roller shaft 21 (the space around the bearing portion) through the gap W. The environment is easy to enter.
[0031]
On the other hand, since the inner space of the mill is maintained at a negative pressure of about −8 kPa (Gauge), the air suction port 61 is provided in the seal member 27 as in this example, so that the mill is caused by the differential pressure from the gap W. Air will flow to the inner space side. That is, since the air supplied from the air suction port 61 is supplied into the mill through the gap W in the direction opposite to the dust intrusion path, the dust can be prevented from entering the bearing portion side.
[0032]
The opening area of the atmospheric suction port 61 is not particularly limited, but the opening area and the number of the atmospheric suction ports 61 determine the amount of air leakage into the mill, and if it is set larger than necessary, the leakage amount increases. , Leading to heat loss of the mill and increased power of the induction fan.
[0033]
As described above, in this example, air is caused to flow into the space inside the mill due to the differential pressure between the pressure inside the mill and the atmospheric pressure, that is, dust is mixed into the bearing portion side by flowing air in the direction opposite to the dust intrusion direction. It is possible to prevent the troubles caused by dust contamination and the periodic disassembly and maintenance, and the operation of the mill over a long period of time can be realized.
[0034]
(No.1The fruitExamples)
  FIG. 7 is a partial cross-sectional view showing the sealing mechanism of the vertical mill of this example, and corresponds to FIG. 4 described above. In FIG. 7, the same members as those in FIG. 4 are denoted by the same reference numerals.
[0035]
The sealing mechanism of this example is different from the first embodiment in that a dust mixing prevention plate 71 is provided.
[0036]
The dust mixing prevention plate 71 is attached to the seal member 27. An air suction port 72 is opened on the dust mixture prevention plate 71 to prevent the atmosphere from leaking into the mill more than necessary.
[0037]
In addition, in a vertical mill like the present invention, a wear hole 73 (see FIG. 7) may be generated in the seal member 27 due to dust inside the mill by long-term operation, and the powder flows into the seal portion from there. Has also been confirmed. For this reason, in the first embodiment described above, there is a risk that dust may enter the bearing portion side when the wear hole 73 is formed. However, by providing the dust mixture prevention plate 71 as in this example, it is also possible to prevent the dust from entering the bearing portion side when the dust leaks.
[0038]
Also in this example, as in the first embodiment, air flows from the gap W to the space in the mill space due to the differential pressure between the atmospheric pressure and the pressure in the mill.
[0039]
The opening area of the air suction port 72 is not particularly limited, but the opening area of the air suction port 72 and the number thereof determine the amount of air leakage into the mill in the same manner as the atmospheric suction port 61. Therefore, the opening area and number should be set appropriately in the same manner as the atmospheric suction port 61. It is also possible to increase the air inlet 72 while observing the state of dust intrusion.
[0040]
In an actual configuration, the air suction port 72 is provided with several or more holes in the dust mixing prevention plate 71, and a screw is cut in the hole, so that it is judged unnecessary. Is preferable.
[0041]
As a specific example, in the LM41 type of Ube Industries' cocoon-type mill, the air suction port 61 is disposed, and a plurality of holes having a diameter of about 10 mm are disposed as the air suction port 72, so that the mill in normal operation is provided. Intrusion of dust from the inside could be effectively prevented.
[0042]
As described above, in this example, air is allowed to flow to the inner space side of the mill due to the pressure difference between the inner pressure of the mill and the atmospheric pressure, and the dust mixing prevention plate 71 is provided, so that dust mixing on the bearing portion side is more effective. Therefore, it is possible to eliminate equipment troubles caused by dust contamination and periodic disassembly and maintenance, and to enable operation of the mill for a long period of time. In addition, it is possible to easily set the amount of air leak into the mill with a very simple configuration, and it is possible to minimize the operational loss due to leak air.
[0043]
(No.2ofreferenceExample)
  FIG. 8 is a partial cross-sectional view showing the sealing mechanism of the vertical mill of this example, and corresponds to FIG. 4 described above. In FIG. 8, the same members as those in FIG. 4 are denoted by the same reference numerals.
[0044]
The sealing mechanism of this example is provided with an air purge pipe 81 inside the roller shaft 21 so that atmospheric air or pressurized air of about 3 kPa (Gauge) can be supplied from the air purge pipe 81 through the air purge hole 82. Is different from the configuration of FIG.
[0045]
The thickness and length of the air purge pipe 81 may be any shape as long as the required air volume is supplied, and the material is not particularly limited. For example, a readily available water pipe and gas pipe can be used. In addition, the vertical mill may already be provided with a pipe corresponding to this, and in this case, this can be diverted.
[0046]
The size of the air purge hole 82 may be any size as long as the necessary air volume is supplied, and the number thereof is not limited. However, in practice, the number is usually limited to a few in consideration of machining and the like.
[0047]
Since a sufficient space is formed along the circumference around the outlet of the air purge hole 82 in this example, the purge air supplied from the air purge hole 82 quickly spreads in the circumferential direction and blows at each part of the gap W. There is no unevenness, and air can be quickly supplied to the inside of the mill with a small amount of resistance, and air can be prevented from flowing back to the bearing portion.
[0048]
In this example, the purge air supplied from the air purge pipe 81 is supplied into the mill through the purge air hole 82 through the gap W between the seal member 27 and the roller boss cover 26. As a result, air is supplied in the direction opposite to the dust entry path, so that dust can be effectively prevented from entering the bearing portion side.
[0049]
(No.2The fruitExamples)
  FIG. 9 is a partial cross-sectional view showing the sealing mechanism of the vertical mill of this example, and corresponds to FIG. 4 described above. In FIG. 9, the same members as those in FIG. 4 are denoted by the same reference numerals.
[0050]
The seal mechanism of this example is different from the third embodiment in that an air purge amount control plate 91 is provided.
[0051]
The air purge amount control plate 91 is attached to the seal member 27. A purge air discharge port 92 and an air suction port 93 are opened on the air purge amount control plate 91 to prevent the purge air from leaking into the mill more than necessary.
[0052]
Also in this example, purge air can be supplied into the mill through the gap W, as in the third embodiment. That is, the purge air supplied from the air purge pipe 81 is supplied into the mill through the gap W through the purge air hole 82, the purge air discharge port 92 and the air suction port 93.
[0053]
A plurality of purge air discharge ports 92 are opened on the air purge amount control plate 91 and function as purge air discharge ports. For this reason, the opening area and quantity should be secured to such an extent that purge air can be discharged without difficulty, but in the event that dust leaks, the total amount is avoided in order to avoid the flow into the bearing as much as possible. The area should be set appropriately. In addition, it is preferable that the purge air discharge port 92 is screwed, the number thereof is set larger, and the plug is appropriately plugged, so that the air flow rate can be optimized quickly.
[0054]
As with the purge air discharge port 92, the air suction port 93 has an opening area and the number of the air intake ports 93 that actually determine the air flow rate into the mill. Therefore, similarly to the purge air discharge port 92, the opening area and number should be set appropriately. It is also possible to increase the air inlet port 93 while observing the dust intrusion state.
[0055]
In an actual form, the air suction port 93 is provided with several or more holes in the air purge amount control plate 91, and the screws are cut in the air purge amount control plate 91 in the same manner as the air suction port 72. It is preferable to set by closing because it is possible to quickly optimize.
[0056]
As a specific example, in the LM41 type of Ube Industries' cocoon-type mill, four 3/4 inch holes are provided as purge air discharge ports 92 and 24 holes of 12 mm diameter are provided as air suction ports 93. This effectively prevented dust from entering from the inside of the mill during normal operation.
[0057]
(No.3ofreferenceExample)
  FIG. 10 is a partial cross-sectional view showing the sealing mechanism of the vertical mill of this example, and corresponds to FIG. 4 described above. In FIG. 10, the same members as those in FIG. 4 are denoted by the same reference numerals.
[0058]
The sealing mechanism of this example forms a labyrinth-like airway by the annular member 101 attached to the roller 12 side which is a rotating part and the annular member 102 attached to the roller shaft 21 side which is a fixed part, and an air purge pipe The third embodiment is different from the third embodiment in that compressed air or air of about 3 kPa (Gauge) can be supplied from 81 through this maze-like airway. The air purge pipe 81 is the same as that in the third embodiment.
[0059]
In order to make the roller 12 portion which is the rotating portion of this example easy to understand, only the rotating portion is indicated by hatching in FIG.
[0060]
The annular members 101 and 102 are disposed between the roller shaft 21 and the roller boss cover 26 and are combined with each other to form a narrow labyrinth-like gap, and this gap serves as an airway for purge air. This airway is called the maze airway.
[0061]
As shown in FIG. 10, the air purge hole 82 is provided at the starting point of the labyrinth airway of the roller shaft 21 and connects the air purge pipe 81 and the labyrinth airway. The size of the air purge hole 82 may be any size as long as the necessary air volume is supplied, and the number thereof is not limited. However, in the actual embodiment, the number of processing may be limited to a few in general when processing is considered.
[0062]
The smaller the labyrinth air gap, the smaller the amount of purge air required, which is preferable. However, both the roller 12 and the roller shaft 21 vibrate irregularly, and considering the avoidance of the metal-to-metal contact associated therewith, 1 It is preferable to set to about 4 mm. Furthermore, it is possible to more reliably prevent dust from entering the bearing portion side by lengthening the airway, and it is preferable that the total extension is set to be long as space permits.
[0063]
Further, it is preferable that a sufficient space is formed around the outlet of the air purge hole 82 as shown in FIG. Accordingly, the purge air supplied from the air purge hole 82 can be quickly spread in the circumferential direction, and it is possible to prevent occurrence of uneven blowing at each part on the circumference. Further, although the sectional shape of the space provided around the outlet of the air purge hole 82 is not particularly limited, the air is promptly supplied with a small resistance to the inside of the mill, that is, the downstream side of the purge air. In consideration of preventing backflow, it is preferable to provide a space having a wedge-shaped cross section that becomes narrower in the downstream direction, that is, in the direction opposite to the bearing side.
[0064]
In this example, the purge air supplied from the air purge pipe 81 passes through the maze airway formed by the annular members 101 and 102 from the purge air hole 82, and is supplied into the mill through the gap W between the seal member 27 and the roller boss cover 26. The As a result, air is supplied in the direction opposite to the dust entry path, so that dust can be effectively prevented from entering the bearing portion side. In addition, since there is no contact portion between the rotating portion and the fixed portion and no sliding portion, no measures such as wear are required.
[0065]
(No.3The fruitExamples)
  FIG. 12 is a partial cross-sectional view showing the sealing mechanism of the vertical mill of this example, and corresponds to FIG. 4 described above. In FIG. 12, the same members as those in FIG. 4 are denoted by the same reference numerals.
[0066]
The sealing mechanism of this example is different from the fifth embodiment in that an air purge amount control plate 91 is provided. The air purge amount control plate 91 is the same as in the fourth embodiment.
[0067]
In this example, the purge air supplied from the air purge pipe 81 passes through the maze airway formed by the annular members 101 and 102 from the purge air hole 82 and is further milled from the gap W through the purge air discharge port 92 and the air suction port 93. Supplied in. As a result, air is supplied in the direction opposite to the dust entry path, so that dust can be effectively prevented from entering the bearing portion side.
[0068]
Also, in this example, since there is no contact portion between the rotating portion and the fixed portion and no sliding portion, measures such as wear are unnecessary. Furthermore, in this example, since the amount of air leaking into the mill can be easily set, it is possible to minimize heat and power loss due to leak air.
[0069]
(No.4The fruitExamples)
  FIG. 13 is a partial sectional view showing the sealing mechanism of the vertical mill of this example, and corresponds to FIG. 4 described above. In FIG. 13, the same members as those in FIG. 4 are denoted by the same reference numerals.
[0070]
The sealing mechanism of this example is different from the sixth embodiment in that an atmospheric suction port 61 is formed at a predetermined position of the sealing member 27. The air suction port 61 is the same as that in the first embodiment.
[0071]
The air suction port 61 can take in necessary leak air from the air. On the other hand, when the purge air supplied from the air purge pipe 81 is larger than the amount of leak air in the mill, it functions as a discharge port for excess air.
[0072]
In this example, the purge air supplied from the air purge pipe 81 passes through the maze airway formed by the annular members 101 and 102 and the purge air discharge port 92 from the purge air hole 82, and further, together with the atmosphere from the atmosphere suction port 61 or the atmosphere The remainder partially discharged from the suction port 61 is supplied into the mill from the gap W through the air suction port 93. As a result, air is supplied in the direction opposite to the dust entry path, so that dust can be effectively prevented from entering the bearing portion side.
[0073]
Also, in this example, there is no contact part between the rotating part and the fixed part, and no sliding part, so measures such as wear are unnecessary, and furthermore, the amount of air leaking into the mill can be easily set, It is possible to minimize heat and power loss due to leak air.
[0074]
(No.4ofreferenceExample)
  FIG. 14 is a partial cross-sectional view showing the sealing mechanism of the vertical mill of this example, and corresponds to FIG. 4 described above. In FIG. 14, the same members as those in FIG. 4 are denoted by the same reference numerals.
[0075]
Instead of supplying pressurized air from the inside of the roller shaft to the labyrinth airway as in the fifth embodiment, the sealing mechanism of this example is a space surrounded by the roller 12 and the roller shaft 21 (a space around the bearing portion). A purge air supply unit 141 that supplies pressurized air therein and communicates with the labyrinth airway is formed in the annular member 101 attached to the roller 12 side.
[0076]
In this example, the purge air supplied to the space around the bearing portion passes through the maze airway formed by the annular members 101 and 102 from the purge air supply portion 141 and is milled from the gap W between the seal member 27 and the roller boss cover 26. Supplied in. As a result, air is supplied in the direction opposite to the dust entry path, so that dust can be effectively prevented from entering the bearing portion. Also in this example, since there is no contact portion between the rotating portion and the fixed portion and no sliding portion, measures such as wear are unnecessary.
[0077]
The vertical mill of the present invention is not limited to the embodiment described above, and can be appropriately modified within the gist of the present invention. For example, a member or the like specially provided in each embodiment can be replaced, or two embodiments can be appropriately combined.
[0078]
【The invention's effect】
As described above, the configuration of the vertical mill of the present invention has the following effects.
[0079]
(1) A seal member is attached to the fixed shaft (roller shaft) side with a predetermined clearance from the roller, and air is allowed to flow from the clearance to the inner space of the mill. A vertical mill capable of preventing dust intrusion, eliminating equipment troubles due to dust contamination, and short-term periodic disassembly and maintenance and capable of continuous operation for a longer period is realized.
[0080]
(2) It is configured so that air flows into the space inside the mill using the pressure difference between the pressure inside the mill and the atmospheric pressure.ByIt is possible to prevent dust from entering the space around the bearing portion with an extremely simple configuration. Further, by configuring the number of atmospheric suction ports or the like to be variable, it is possible to easily set the amount of air leak into the mill, and to minimize operational loss due to leak air.
[0082]
(3) When a ring member is attached to the roller side and the fixed shaft (roller shaft) side to form a labyrinth airway, and the air flows through the labyrinth airway to the inner space of the mill, the space around the bearing part It is possible to prevent dust from entering into the water very effectively. Moreover, it is possible to have a structure that does not have a contact portion between the rotating portion and the fixed portion and a sliding portion, and a vertical mill capable of continuous operation over a longer period is realized.
For example, when an air purge amount control plate or the like is provided, the amount of air leak into the mill can be easily set, and the operational loss due to leak air can be minimized.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a configuration example of a vertical mill.
FIG. 2 is an enlarged sectional view schematically showing around a roller portion of a vertical mill.
FIG. 3 is a diagram in which a rotating part and a fixed part in FIG. 2 are distinguished from each other.
FIG. 4 is a cross-sectional view for explaining a sealing mechanism in a conventional vertical mill.
FIG. 5 is a diagram in which a rotating part and a fixed part in FIG. 4 are distinguished from each other.
FIG. 6 is a cross-sectional view for explaining a sealing mechanism according to a first embodiment of the present invention.
FIG. 7 is a cross-sectional view for explaining a seal mechanism according to a second embodiment of the present invention.
FIG. 8 is a cross-sectional view for explaining a seal mechanism according to a third embodiment of the present invention.
FIG. 9 is a cross-sectional view for explaining a sealing mechanism according to a fourth embodiment of the present invention.
FIG. 10 is a cross-sectional view for explaining a seal mechanism according to a fifth embodiment of the present invention.
FIG. 11 is a diagram showing the rotating part and the fixed part in FIG. 10 in a distinguished manner.
FIG. 12 is a cross-sectional view for explaining a seal mechanism according to a sixth embodiment of the present invention.
FIG. 13 is a cross-sectional view for explaining a seal mechanism according to a seventh embodiment of the present invention.
FIG. 14 is a cross-sectional view for explaining a seal mechanism according to an eighth embodiment of the present invention.
[Explanation of symbols]
10 Vertical mill (pulverizer)
11 Rotary table
12 Rollers
13 Raw material chute
14 classifier
21 Roller shaft
22 Rolling bearing
23 Roller Boss
24 Roller tire
25, 26 Roller boss cover
27 Seal member
28 arms
29 mil casing
41 Seal ring
42 Ceramic packing
43 Wool felt
44 Mechanical seal
45, 46 Seal ring
61 Air suction port
71 Dust mixing prevention plate
72 Air suction port
73 Wear hole
81 Air purge piping
82 Air purge hole
91 Air purge control board
92 Purge air outlet
93 Air suction port
101, 102 annular member
141 Purge air supply unit

Claims (2)

In a vertical mill that performs pulverization by biting an object to be crushed into a gap between a rotary table and a roller supported by a fixed shaft,
A seal member is attached to the fixed shaft side with a predetermined gap from the roller, and the seal member is provided with several or more holes as air inlets , and the air leak amount is reduced by closing the holes. It comprises an adjustable member, characterized in that it forms a seal mechanism for flowing air from the gap through the air suction port by the pressure difference between the mill internal pressure and the atmospheric pressure in the mill space side vertical Mold mill.   The sealing mechanism is a mechanism that causes air to flow to the space inside the mill through a labyrinth-shaped airway formed by an annular member attached to the roller side and an annular member attached to the fixed shaft side. The vertical mill according to claim 1.

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