CN204061915U - Coal pulverizer and pull-rod device thereof - Google Patents
Coal pulverizer and pull-rod device thereof Download PDFInfo
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- CN204061915U CN204061915U CN201420525138.9U CN201420525138U CN204061915U CN 204061915 U CN204061915 U CN 204061915U CN 201420525138 U CN201420525138 U CN 201420525138U CN 204061915 U CN204061915 U CN 204061915U
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- rod device
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- 239000003245 coal Substances 0.000 title claims abstract description 40
- 238000007789 sealing Methods 0.000 claims abstract description 14
- 238000000227 grinding Methods 0.000 claims description 28
- 210000003141 lower extremity Anatomy 0.000 claims description 7
- 239000000843 powder Substances 0.000 abstract description 4
- 239000002817 coal dust Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 210000004907 gland Anatomy 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 230000003534 oscillatory effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- Crushing And Grinding (AREA)
Abstract
The utility model discloses a kind of coal pulverizer and pull-rod device thereof, this pull-rod device comprises: pull bar (8), and this pull bar is set to can vertically movement; Have the seal casinghousing (16) of wind chamber (16c), described pull bar vertically runs through wind chamber by the upper structure hole (16a) of seal casinghousing and lower structure hole (16b); Top seal and lower seal, top seal is for sealing upper structure hole, lower seal is for sealing lower structure hole, lower seal comprises the first flange plate (18) be fixed on hermetically on pull bar, and this first flange plate is connected to the lower structure hole periphery of seal casinghousing by the spring cylinder (17) arranged around pull bar.The first flange plate due to lower seal to be fixed on pull bar can move with pull bar, avoids the wearing and tearing between lower seal and pull bar, thus effectively reduces and leak powder amount, improves operating environment.
Description
Technical field
The utility model relates to mechanical seal structure, particularly, relates to a kind of pull-rod device of coal pulverizer.In addition, the utility model also relates to a kind of coal pulverizer with described pull-rod device.
Background technique
Coal pulverizer is the equipment of the coal dust for raw coal being ground into certain fineness and moisture content, is mainly used in the fields such as thermal power generation, smelting iron and steel, manufacture of cement.Different according to working machine rotating speed, coal pulverizer can be divided into low-speed coal mill, medium-speed pulverizer and high speed coal mill.Wherein, different according to structure, generally medium-speed pulverizer is divided into wheeled coal pulverizer, Raymond bowl mill, ball coal pulverizer peace dish coal pulverizer, described wheeled coal pulverizer is as roller ring mill (ZGM).
Figure 1 shows that a kind of sectional structure schematic diagram of common roll-type coal pulverizer.This coal pulverizer has following working principle: power is reached mill 4 by coupling 2 and speed reducer 3 and drives this mill 4 to rotate in the horizontal plane by motor 1, three grinding rollers 5 rotation rotarily driven above it of mill 4, to produce grinding forces between the circumferential surface and mill 4 of grinding roller 5.The raw coal that need grind drops on mill 4 from the fuel dropping pipe 6 on coal pulverizer top, and because mill 4 rotates, the raw coal falling thereon radially also evenly will enter region of milling to mill 4 peripolesis under centrifugal action.In above process, grinding forces between grinding roller 5 and mill 4 is by being positioned at grinding roller 5 top and reaching coal mill foundations for the loading frame 7 (or claiming pressure rack) of the described grinding roller 5 of hinged installation and the pull bar 8 that is installed on this loading frame 7 periphery, usually load cylinder 9 is provided with between coal mill foundations and pull bar 8, thus can according to adjustment grinding forces such as coals.
At coal pulverizer inner chamber, coal dust can outwards be blown out with the link position of pull bar 8 by the loading frame 7 on housing by the hot blast for pulverized coal conveying and dry raw coal, thus forms leakage powder.Therefore, need to arrange tie-rod sealing structure 10 on pull bar 8.
Figure 2 shows that the disclosed a kind of vertical middle-speed coal-grinding machine pull rod seal device of Chinese utility model patent (CN 202659898U), comprise top seal and lower seal.Wherein, top seal comprises seal rubber sleeve 11 and loose gland 12; Lower seal comprises lower seal gum cover 13, lower seal sleeve 14 and lower seal flange 15.
Owing to having upper seal rubber sleeve 11 and lower seal gum cover 13, above-mentioned pull rod seal device has good sealing effect, also can reduce the part wears to pull bar 8.But, along with pull bar in loading procedure 8 constantly to-and-fro motion, the lower seal gum cover 13 making to be made by rubber type of material is produced wearing and tearing, thus coal dust is revealed from lower seal and pollutes running environment.Further, after wearing and tearing, need the lower seal gum cover 13 more renewed, cost is increased.For top seal, there is relative movement with the loose gland 12 for fixing upper seal rubber sleeve 11 in pull bar 8, thus can accelerate the wearing and tearing of pull bar 8 in this position, increase and leak powder amount.
In view of this, be necessary to provide a kind of Novel pull rod device, to overcome above-mentioned problems of the prior art.
Model utility content
Problem to be solved in the utility model is to provide a kind of pull-rod device of coal pulverizer, and this pull-rod device effectively can avoid lower seal and the mutual friction of pull bar phase, increases the service life, cost-saving.
To achieve these goals, the utility model provides a kind of pull-rod device of coal pulverizer, and this pull-rod device comprises: pull bar, and this pull bar is set to can vertically movement; Have the seal casinghousing in wind chamber, described pull bar vertically runs through described wind chamber by the upper structure hole of described seal casinghousing and lower structure hole; And, top seal and lower seal, described top seal is for sealing described upper structure hole, described lower seal is for sealing described lower structure hole, wherein, described lower seal comprises the first flange plate be fixed on hermetically on described pull bar, and this first flange plate is connected to the described lower structure hole periphery of described seal casinghousing by the spring cylinder arranged around described pull bar.
Preferably, described spring cylinder is rubber compensator, and the first end of this rubber compensator is formed with the upper rubber flange for being connected with described seal casinghousing, and the second end is formed with the lower rubber flange for being connected with described first flange plate.
Preferably, described rubber compensator is also arranged with the second flange plate and three-flange dish, described upper rubber flange is sandwiched between described second flange plate and described seal casinghousing, the described first end of described rubber compensator is connected to described seal casinghousing by bolt; Described lower rubber flange is sandwiched between described first flange plate and described three-flange dish, described first flange plate to be connected to by bolt described second end of described rubber compensator.
Preferably, the junction point of the junction point of described upper rubber flange and described second flange plate, described lower rubber flange and described first flange plate and described three-flange dish is respectively equipped with seal gease.
Preferably, described top seal comprises rubber seal, and this rubber seal to be sheathed on described pull bar and to be fixed on described seal casinghousing around described upper structure hole.
Preferably, described top seal also comprises the 4th flange plate, and described rubber seal has annular flange flange, and this annular flange flange is sandwiched between described 4th flange plate and described seal casinghousing, described rubber seal is fixed on described seal casinghousing by bolt.
Preferably, described pull-rod device also comprises fixed cover and is located at described pull bar and the dust-proof cover of housing above described top seal.
Preferably, described dust-proof cover is formed as the taper of opening towards described top seal.
Preferably, described pull bar moves between upper extreme position and lower limit position, and wherein, when described pull bar moves to described lower limit position, the beeline between the lower limb of described dust-proof cover and described top seal or described seal casinghousing is 5mm-8mm.
On this basis, the utility model also provides a kind of coal pulverizer, and this coal pulverizer comprises: mill, and this mill can drive and rotate in the horizontal plane by hard to bear power plant; Grinding roller, this grinding roller to be installed on loading frame and can the rotation with the rotation of described mill, to produce grinding forces between the circumferential surface and described mill of described grinding roller; And, pull-rod device, it is that described grinding roller loads and seals described coal pulverizer that this pull-rod device is used for by described loading frame; Wherein, the described pull-rod device of described pull-rod device for providing according to the utility model.
By technique scheme, because the first flange plate is fixed on pull bar, thus can move with pull bar, make to there is not friction between lower seal and pull bar, avoid wearing and tearing, extend working life, cost-saving.The pull-rod device that the utility model provides can effectively reduce leaks powder amount, improves operating environment.
Other feature and advantage of the present utility model are described in detail in embodiment part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide further understanding of the present utility model, and forms a part for specification, is used from explanation the utility model, but does not form restriction of the present utility model with embodiment one below.In the accompanying drawings:
Figure 1 shows that a kind of sectional structure schematic diagram of common roll-type coal pulverizer;
Figure 2 shows that the structural representation of the machine pull rod seal device of a kind of fast coal-grinding in prior art;
Figure 3 shows that the cross-sectional schematic according to pull-rod device of the present utility model;
Fig. 4 to Fig. 6 is the structural representation of a part of parts in the pull-rod device shown in Fig. 3 respectively.
Description of reference numerals
1 motor 2 coupling
3 speed reducer 4 mills
5 grinding roller 6 fuel dropping pipes
7 loading frame 8 pull bars
9 load cylinder 10 tie-rod sealing structures
Seal rubber sleeve 12 loose gland on 11
13 lower seal gum cover 14 lower seal sleeves
15 lower seal flange 16 seal casinghousings
Structure hole under the upper structure hole 16b of 16a
16c wind chamber 17 spring cylinder
Rubber flange under the upper rubber flange 17b of 17a
18 first flange plate 19 second flange plate
20 three-flange dish 21 rubber seals
22 the 4th flange plate 23 dust-proof cover
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the utility model, is not limited to the utility model.
In the present invention, when not doing contrary explanation, the noun of locality such as " upper and lower, left and right " of use typically refers to reference to upper and lower, left and right shown in the drawings; " inside and outside " refers to profile inside and outside relative to each parts itself.
First it should be noted that, coal pulverizer described in the utility model is not limited to the equipment of processing coal dust, also should comprise the equipment that can be used in the preparation of various pulvis, slag and pulverized fuel ash grinding etc.In addition, the utility model mainly pays close attention to the pull rod seal device of these equipment, and therefore not directly related with pull bar part part will not be described in detail, and can arrange this with reference to the structure of traditional coal pulverizer.
With reference to shown in Fig. 3 to Fig. 6, according to the pull-rod device of the coal pulverizer of a kind of preferred implementation of the utility model, comprising: pull bar 8, this pull bar 8 is set to vertically to move thus is that grinding roller loads by loading frame; Have the seal casinghousing 16 of wind chamber 16c, described pull bar 8 vertically runs through described wind chamber 16c by the upper structure hole 16a of described seal casinghousing 16 and lower structure hole 16b; And, top seal and lower seal, described top seal is for sealing described upper structure hole 16a, described lower seal is for sealing described lower structure hole 16b, wherein, described lower seal comprises the first flange plate 18 be fixed on hermetically on described pull bar 8, and this first flange plate 18 is connected to the described lower structure hole 16b periphery of described seal casinghousing 16 by the spring cylinder 17 arranged around described pull bar 8.
From illustrating above, core idea of the present utility model is that the part contacted with pull bar 8 enabling lower seal is moved with the motion of pull bar 8, thus avoids pull bar 8 and the mutual friction of lower seal phase, avoids wearing and tearing to occur.The utility model realizes this technical conceive with the first flange plate 18 connected by spring cylinder 17, particularly, along with pull bar 8 moves (comprise and move axially and move radially), because spring cylinder 17 can stretch at axial direction, and because spring cylinder 17 is in the micro-strain of radial direction, its for connect the first flange plate 18 one end can slight oscillatory to adapt to move radially, thus avoid the relative movement between the first flange plate 18 and pull bar 8.
Based on above-mentioned technical conceive, easy for installation in order to make, in pull-rod device of the present utility model, other flange arrangements (as the second flange plate 19 etc.) of described first flange plate 18 and the following stated can be the mounting structure be made up of two semi-discs, and should not be defined as the flange plate of narrow sense in traditional sense.
In pull-rod device of the present utility model, preferably but be not limited to rubber compensator, rubber compensator also claims bending rubber joint, is flexible coupling described spring cylinder 17, is generally made up of the smooth waveform compensation element of two end band rubber flange and metal flange.With reference to Fig. 3, the first end of rubber compensator is formed with the upper rubber flange 17a for being connected with described seal casinghousing 16, and the second end is formed with the lower rubber flange 17b for being connected with described first flange plate 18.In addition, described rubber compensator is also arranged with the second flange plate 19 and three-flange dish 20, described upper rubber flange 17a is sandwiched between described second flange plate 19 and described seal casinghousing 16, the described first end of described rubber compensator is connected to described seal casinghousing 16 by bolt; Described lower rubber flange 17b is sandwiched between described first flange plate 18 and described three-flange dish 20, described first flange plate 18 to be connected to by bolt described second end of described rubber compensator.Further, in order to ensure contacting well, improving sealing effect, seal gease can be established respectively, as molybdenum disulphide grease etc. by the junction point of rubber flange 17a and the junction point of described second flange plate 19, described lower rubber flange 17b and described first flange plate 18 and described three-flange dish 20 on described.By above-mentioned setting, lower seal is formed as one and removably connects, and is convenient to change easily damaged parts rubber compensator.
As a kind of Alternate embodiments, also the upper rubber flange 17a of rubber compensator can be directly connected on seal casinghousing 16, or be connected between the first flange plate 18 on lower rubber flange 17b.This arrangement eliminates second and three-flange dish, also make join strength significantly reduce simultaneously.
The foregoing describe the lower seal of pull-rod device of the present utility model, below will describe in detail top seal.Top seal can comprise rubber seal 21, and this rubber seal 21 to be sheathed on described pull bar 8 and to be fixed on described seal casinghousing 16 around described upper structure hole 16a.There is relative movement with rubber seal 21 in pull bar 8, inevitably produce wearing and tearing in movement process, and thus coal dust can enter seal casinghousing 16 by upper structure hole 16a.To this, usually need to ventilate in seal casinghousing 16, by the upper structure hole 16a of coal dust blowout in the 16c of wind chamber, as shown in Figure 3.
Above-mentioned rubber seal 21 can be fixed on seal casinghousing 16 in several ways.Such as, top seal also comprises the 4th flange plate 22, rubber seal 21 has annular flange flange, and this annular flange flange is sandwiched between described 4th flange plate 22 and described seal casinghousing 16, described rubber seal 21 is fixed on described seal casinghousing 16 by bolt.
In pull-rod device according to a kind of comparatively preferred implementation of the utility model, also comprise fixed cover and be located at pull bar 8 and the dust-proof cover 23 of housing above top seal, to form protection to top seal.Dust-proof cover 23 is mainly used in forming protection to above-mentioned rubber seal 21, prevents coal dust from piling up above it, therefore, preferably makes dust-proof cover 23 be formed as downward opening taper.For ease of installing, this dust-proof cover 23 also can be made up of two-part, as shown in Figure 6.
Pull bar 8 can move between upper extreme position and lower limit position, when described pull bar 8 moves to described lower limit position, beeline between the lower limb of described dust-proof cover 23 and described top seal or described seal casinghousing 16 is 5mm-8mm, with while minimizing coal dust arrives structure hole 16a place as far as possible, excessive retardance can not be formed to the air-flow blown out from wind chamber 16c.For in the pull-rod device shown in Fig. 3, above-mentioned beeline refers to the vertical distance between the lower limb of dust-proof cover 23 and the upper surface of the 4th flange plate 22.When the radial dimension of the 4th flange plate 22 is less, when making the complete cover cap of the down-contour of dust-proof cover 23 the 4th flange plate 22, then described beeline should be the distance between the upper surface of dust-proof cover 23 lower limb and rubber seal 21 or seal casinghousing 16.
Above to of the present utility model multiple preferably and alternative be illustrated; below with reference to the pull-rod device shown in Fig. 3, its installation process is described; these explanations only understand the utility model better in order to help, and do not limit protection domain of the present utility model.
First, rubber seal 21 to be set on pull bar 8 and to make it to contact with seal casinghousing 16, the 4th flange plate 22 being pressed in the annular flange flange of rubber seal 21, and by bolt, the 4th flange plate 22 being fixed on seal casinghousing 16;
Secondly, load and demarcate the lower limit position of pull bar 8, to determine the mounting point of dust-proof cover 23; In this mounting point, dust-proof cover 23 is installed, makes gap between the upper surface of dust-proof cover 23 lower limb and the 4th flange plate 22 be 5mm-8mm;
Finally, by the second flange plate 19, the upper rubber flange 17a of rubber compensator is fixed on seal casinghousing 16, under rubber compensator is in free extended configuration, first flange plate 18 is fixed on the position concordant with the lower limb of rubber compensator of pull bar 8, and is connected with rubber compensator by three-flange dish 20.
On this basis, the utility model also provides a kind of coal pulverizer, and this coal pulverizer comprises: mill 4, and this mill 4 can drive (as motor 1) and rotate in the horizontal plane by hard to bear power plant; Grinding roller 5, this grinding roller 5 to be installed on loading frame 7 and can the rotation with the rotation of described mill 4, to produce grinding forces between the circumferential surface and described mill 4 of described grinding roller 5; And, pull-rod device, this pull-rod device is used for being loaded by described loading frame 7 for described grinding roller 5 and sealing described coal pulverizer; Wherein, the described pull-rod device that provides for the utility model of described pull-rod device.
Below preferred implementation of the present utility model is described by reference to the accompanying drawings in detail; but; the utility model is not limited to the detail in above-mentioned mode of execution; within the scope of technical conceive of the present utility model; can carry out multiple simple variant to the technical solution of the utility model, these simple variant all belong to protection domain of the present utility model.
It should be noted that in addition, each the concrete technical characteristics described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode.In order to avoid unnecessary repetition, the utility model illustrates no longer separately to various possible compound mode.
In addition, also can carry out combination in any between various different mode of execution of the present utility model, as long as it is without prejudice to thought of the present utility model, it should be considered as content disclosed in the utility model equally.
Claims (10)
1. a pull-rod device for coal pulverizer, this pull-rod device comprises:
Pull bar (8), this pull bar (8) is set to can vertically movement;
Have the seal casinghousing (16) of wind chamber (16c), described pull bar (8) vertically runs through described wind chamber (16c) by the upper structure hole (16a) of described seal casinghousing (16) and lower structure hole (16b); And
Top seal and lower seal, described top seal is for sealing described upper structure hole (16a), and described lower seal, for sealing described lower structure hole (16b), is characterized in that,
Described lower seal comprises the first flange plate (18) be fixed on hermetically on described pull bar (8), and this first flange plate (18) is connected to described lower structure hole (16b) periphery of described seal casinghousing (16) by the spring cylinder (17) arranged around described pull bar (8).
2. pull-rod device according to claim 1, it is characterized in that, described spring cylinder (17) is rubber compensator, the first end of this rubber compensator is formed with the upper rubber flange (17a) for being connected with described seal casinghousing (16), and the second end is formed with the lower rubber flange (17b) for being connected with described first flange plate (18).
3. pull-rod device according to claim 2, it is characterized in that, described rubber compensator is also arranged with the second flange plate (19) and three-flange dish (20), described upper rubber flange (17a) is sandwiched between described second flange plate (19) and described seal casinghousing (16), the described first end of described rubber compensator is connected to described seal casinghousing (16) by bolt; Described lower rubber flange (17b) is sandwiched between described first flange plate (18) and described three-flange dish (20), described first flange plate (18) to be connected to by bolt described second end of described rubber compensator.
4. pull-rod device according to claim 3, it is characterized in that, junction point, the described lower rubber flange (17b) of described upper rubber flange (17a) and described second flange plate (19) are respectively equipped with seal gease with the junction point of described first flange plate (18) and described three-flange dish (20).
5. pull-rod device according to claim 1, it is characterized in that, described top seal comprises rubber seal (21), and this rubber seal (21) is sheathed on described pull bar (8) and goes up and be fixed on described seal casinghousing (16) around described upper structure hole (16a).
6. pull-rod device according to claim 5, it is characterized in that, described top seal also comprises the 4th flange plate (22), described rubber seal (21) has annular flange flange, this annular flange flange is sandwiched between described 4th flange plate (22) and described seal casinghousing (16), described rubber seal (21) is fixed on described seal casinghousing (16) by bolt.
7. pull-rod device as claimed in any of claims 1 to 6, is characterized in that, described pull-rod device also comprises fixed cover and is located at described pull bar (8) and the dust-proof cover of housing above described top seal (23).
8. pull-rod device according to claim 7, is characterized in that, described dust-proof cover (23) is formed as the taper of opening towards described top seal.
9. pull-rod device according to claim 7, it is characterized in that, described pull bar (8) moves between upper extreme position and lower limit position, wherein, when described pull bar (8) moves to described lower limit position, the beeline between the lower limb of described dust-proof cover (23) and described top seal or described seal casinghousing (16) is 5mm-8mm.
10. a coal pulverizer, this coal pulverizer comprises:
Mill (4), this mill (4) can drive and rotate in the horizontal plane by hard to bear power plant;
Grinding roller (5), it is upper and can the rotation with the rotation of described mill (4) that this grinding roller (5) is installed on loading frame (7), to produce grinding forces between the circumferential surface and described mill (4) of described grinding roller (5); And
Pull-rod device, this pull-rod device is used for being loaded for described grinding roller (5) by described loading frame (7) and sealing described coal pulverizer; It is characterized in that,
Described pull-rod device is pull-rod device as claimed in any of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420525138.9U CN204061915U (en) | 2014-09-12 | 2014-09-12 | Coal pulverizer and pull-rod device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420525138.9U CN204061915U (en) | 2014-09-12 | 2014-09-12 | Coal pulverizer and pull-rod device thereof |
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| Publication Number | Publication Date |
|---|---|
| CN204061915U true CN204061915U (en) | 2014-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420525138.9U Active CN204061915U (en) | 2014-09-12 | 2014-09-12 | Coal pulverizer and pull-rod device thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113958713A (en) * | 2021-10-29 | 2022-01-21 | 华能秦煤瑞金发电有限责任公司 | Hydraulic pull rod sealing device of medium-speed coal mill |
-
2014
- 2014-09-12 CN CN201420525138.9U patent/CN204061915U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113958713A (en) * | 2021-10-29 | 2022-01-21 | 华能秦煤瑞金发电有限责任公司 | Hydraulic pull rod sealing device of medium-speed coal mill |
| CN113958713B (en) * | 2021-10-29 | 2023-10-10 | 华能秦煤瑞金发电有限责任公司 | Hydraulic pull rod sealing device of medium-speed coal mill |
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