CN111842499A - Waterproof structure of rolling mill bearing box - Google Patents
Waterproof structure of rolling mill bearing box Download PDFInfo
- Publication number
- CN111842499A CN111842499A CN202010753823.7A CN202010753823A CN111842499A CN 111842499 A CN111842499 A CN 111842499A CN 202010753823 A CN202010753823 A CN 202010753823A CN 111842499 A CN111842499 A CN 111842499A
- Authority
- CN
- China
- Prior art keywords
- boss
- ring
- rolling mill
- waterproof
- bearing box
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
- B21B31/02—Rolling stand frames or housings; Roll mountings ; Roll chocks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B28/00—Maintaining rolls or rolling equipment in effective condition
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
Abstract
The application provides a rolling mill bearing box waterproof construction relates to rolling mill technical field. The rolling mill bearing box waterproof construction includes: waterproof ring, manger plate ring, first sealing member and second sealing member. The waterproof ring is used for the cover to locate the roll, and the waterproof ring has the protection chamber, and the manger plate ring includes connecting seat and boss, and the boss sets up in the connecting seat, and the connecting seat is used for being connected with the bearing box, and the boss stretches into the protection chamber, and the lateral wall of boss passes through the sealed cooperation in one side chamber wall of first sealing member and protection chamber, and the inside wall of boss passes through the sealed cooperation in the other one side chamber wall of second sealing member and protection chamber. The waterproof structure of the bearing box of the rolling mill stretches the boss into the protection cavity, and the first sealing element and the second sealing element are respectively arranged on the inner side and the outer side of the boss, so that the sealing performance between the roller and the bearing box is improved, and the bearing box is not easy to lose efficacy. The bearing can be effectively prevented from being polluted, and normal work is guaranteed.
Description
Technical Field
The application relates to the technical field of rolling mills, in particular to a waterproof structure of a bearing box of a rolling mill.
Background
The roughing mill and the intermediate mill are common bar processing equipment, and the driving end of the roughing mill and the intermediate mill are arranged on the upper portion and the driven end of the roughing mill and the intermediate mill are arranged on the lower portion. Sealing is required between the rolls and the bearing housing of the rolling mill.
When steel is rolled, part of the oxidized powder is washed down by cooling water and falls on the surface of the passive bearing box, and the steel billet and the drawn wire formed by the friction of the guide plate also fall on the surface of the bearing box.
In practice, it has been found that the existing seal between the roll and the bearing housing gradually fails as the roll operates, so that the bearing is contaminated with impurities such as oxidized powder, water, etc.
Disclosure of Invention
An object of the application is to provide a rolling mill bearing box waterproof construction, it can improve the problem that the sealed easy inefficacy between current roll and the bearing box.
The embodiment of the application is realized as follows:
the embodiment of the application provides a rolling mill bearing box waterproof construction, includes: the water-proof ring, the water-retaining ring, the first sealing element and the second sealing element;
the waterproof ring is used for sleeving the roller, the waterproof ring is provided with a protective cavity, the water retaining ring comprises a connecting seat and a boss, the boss is arranged on the connecting seat, the connecting seat is used for being connected with the bearing box, the boss stretches into the protective cavity, the outer side wall of the boss passes through the first sealing element and the sealed cooperation of the cavity wall on one side of the protective cavity, and the inner side wall of the boss passes through the second sealing element and the sealed cooperation of the cavity wall on the other side of the protective cavity.
The boss through with the water retaining ring stretches into the protection chamber of waterproof ring to set up first sealing member and second sealing member respectively in the inside and outside both sides of boss, whole rolling mill bearing box waterproof construction can play better sealed effect than prior art, reduces the influence of impurity such as cooling water and oxidation powder, and the guarantee bearing is not polluted by these impurity.
In addition, according to the waterproof structure of the rolling mill bearing box provided by the embodiment of the application, the following additional technical characteristics can be provided:
in an alternative embodiment of the present application, the first sealing element is an O-ring, and the boss and/or the waterproof ring is provided with a sealing ring groove.
The O-shaped sealing ring is a commonly used sealing element easy to install, the installation position of the O-shaped sealing ring can be formed only by processing the boss and/or the waterproof ring in a small amount, and the O-shaped sealing ring is very convenient to use.
In an alternative embodiment of the present application, the seal ring groove opens 3mm below the end face of the boss.
The existing water retaining ring is reformed, so that the installation requirement of the O-shaped sealing ring can be met, and the strength of the installation part is guaranteed.
In an alternative embodiment of the present application, the second seal is a backbone oil seal.
The skeleton oil seal is a common seal and can form a reliable seal between the waterproof ring and the boss.
In an optional embodiment of the application, two framework oil seals are arranged between the boss and the waterproof ring, and the two framework oil seals are sequentially arranged along the axis direction of the roller.
Two skeleton oil seals can play the protection of one more layer in existing space, increase the sealed wearing and tearing time of one time more. Even if one framework oil seal is abraded due to an accident condition in the maintenance interval time, the sealing effect between the roller and the bearing box is not easily influenced. And the pollution of the bearing is avoided.
In an optional embodiment of the present application, the waterproof ring includes an outer ring and an inner ring, the outer ring and the inner ring are connected and enclose the protection cavity, and a width of the outer ring is greater than 22 mm.
Compared with the prior art, the height is improved, the water-saving device has a buffering effect on flowing water and has drop pressure on accumulated water, so that the water is not easy to flow upwards.
In an alternative embodiment of the present application, the outer ring body has a cover-in depth of 37 mm.
In an alternative embodiment of the present application, the height of the outer side wall of the boss is greater than 13.5 mm.
Compared with the prior art, the boss of the embodiment is higher, and the water retaining capacity is improved.
In an alternative embodiment of the present application, the height of the outer side wall of the boss is 41.5 mm.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a sectional view of a waterproof structure of a rolling mill bearing housing provided in an embodiment of the present application;
FIG. 2 is a schematic view of FIG. 1 installed between a bearing housing and a roll;
FIG. 3 is a schematic view of a waterproof ring;
fig. 4 is a schematic view of the water retaining ring.
Icon: 100-waterproof structure of the bearing box of the rolling mill; 10-a waterproof ring; 11-outer ring body; 12-internal ring body; 101-a protective cavity; 20-a water retaining ring; 21-a connecting seat; 22-a boss; 221-seal ring groove; 30-a first seal; 40-a second seal; 200-a bearing housing; 300-rolling; 400-bolt.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the product conventionally places when used, and are only used for convenience of description and simplification of description, but do not indicate or imply that the device or element to which the reference is made must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Examples
Referring to fig. 1 to 4, an embodiment of the present application provides a rolling mill bearing housing waterproof structure 100, including: a waterproof ring 10, a water retaining ring 20, a first seal 30 and a second seal 40;
It should be noted that, in the embodiment, a certain gap is left for the parts to be shown more clearly, in practical fitting, there is little or no gap between the outer edge of the waterproof ring 10 and the outer side wall of the boss 22 of the water retaining ring 20, and the gap between the inner side wall of the boss 22 and the waterproof ring 10 is filled with the second sealing element 40 to prevent impurities from entering the position of the bearing.
Generally speaking, the boss 22 of the water retaining ring 20 extends into the protection cavity 101 of the waterproof ring 10, and the first sealing element 30 and the second sealing element 40 are respectively arranged on the inner side and the outer side of the boss 22, so that the whole rolling mill bearing box waterproof structure 100 can achieve a better sealing effect compared with the prior art, reduce the influence of impurities such as cooling water and oxidized powder, and ensure that the bearing is not polluted by the impurities.
In detail, in the present embodiment, the first sealing member 30 is an O-ring, and the boss 22 and/or the waterproof ring 10 is provided with a sealing ring groove. The O-shaped sealing ring is a commonly used sealing element easy to install, the installation position of the O-shaped sealing ring can be formed only by processing the boss 22 and/or the waterproof ring 10 in a small amount, and the O-shaped sealing ring is very convenient to use.
More specifically, the outer sidewall of the boss 22 may be provided with a seal ring groove, the inner sidewall of the outer edge of the waterproof ring 10 may be provided with an inner sidewall of the outer edge of the waterproof ring 10, and the outer sidewall of the boss 22 and the inner sidewall of the outer edge of the waterproof ring 10 may be provided with both grooves, as long as the O-ring can be smoothly installed and the assembly is stable.
In the present embodiment, the seal groove 221 is opened 3mm below the end face of the boss 22. The existing water retaining ring 20 can be improved, the installation requirement of the O-shaped sealing ring can be met, the strength of the installation part is guaranteed, and the special purchase cost is reduced. In the present embodiment, the width of the gasket groove 221 is 5 mm. The O-ring used in this example is of a type of phi 5X 450 mm.
In detail, in the present embodiment, the second seal 40 is a skeleton oil seal. The skeleton oil seal is a common seal and is capable of forming a reliable seal between the waterproof ring 10 and the boss 22. In this embodiment, two skeleton oil seals are provided between the boss 22 and the waterproof ring 10, and the two skeleton oil seals are sequentially provided along the axial direction of the roll 300. Furthermore, the models of the two framework oil seals are the same, and the models do not need to be distinguished specially during installation.
Two skeleton oil seals can play the protection of one more layer in existing space, increase the sealed wearing and tearing time of one time more. Even if one framework oil seal is abraded due to an accident in the maintenance interval time, the sealing effect between the roller 300 and the bearing box 200 is not easily affected. In addition, if impurity is not cleared up for a long time, form the position that the water hollow overflows into skeleton oil blanket and locate, also can protect by one more layer, extension seal wear time avoids the bearing pollution.
Referring to fig. 3, in particular, in the present embodiment, the waterproof ring 10 includes an outer ring 11 and an inner ring 12, and the outer ring 11 and the inner ring 12 are connected and enclose a protection cavity 101.
In detail, the width of the outer ring body 11 is greater than 22 mm. Compared with the prior art, the height is improved, the water-saving device has a buffering effect on flowing water and has drop pressure on accumulated water, so that the water is not easy to flow upwards. The height of the outer side wall of the boss 22 is greater than 13.5 mm. The boss 22 of the present embodiment is higher than the prior art, and improves the water blocking capability.
In this embodiment, the cover-in depth of the outer ring body 11 is 37mm, and the width of the outer ring body 11 itself is 48 mm. Correspondingly, the height of the outer side wall of the boss 22 is 41.5 mm. The width of the outer ring body 11 as referred to herein means that the distance S from the bottom surface of the guard cavity 101 to the end surface of the outer ring body 11 in fig. 1 is actually 48 mm. Referring to fig. 4, the height of the outer sidewall of the boss 22 is the distance H from the top surface of the boss 22 to the top surface of the connecting seat 21.
In the prior art, a sealing ring is adopted between a roller and a bearing box to cover a retainer ring to realize matching sealing. The actual cover depth of the used sealing ring is only 6-8mm, and the distance from the end face of the protruding part of the retainer ring to the main body is only 13.5 mm. The main body part of the retainer ring has a plane with the width of 61mm, and a bearing box is arranged below the plane. In actual operation, some of the oxidized powder produced during rolling will fall on the bearing housing surface after being washed by cooling water. The steel billet and the drawn wire formed by the friction of the guide plate fall onto the surface of the bearing box together.
In the case of a production time of 5 hours, for this short production time, the oxidized powder and the wire can be piled up to a powder pile 50mm high, enclosing one third of the bearing housing surface. Oxidized powder is arranged at the place with water flow, and the water flow flows around the retainer ring of the bearing box along the powder pile.
The unsmooth drainage can accumulate high water level, which can be higher than the height of 13.5mm of the protruding part of the retainer ring. The cover depth of the sealing ring is 8mm, so that the water flow cannot be prevented. The flat surface around the retainer is the "foot point" for the powder and fiber strands, and the water flow is also accumulated on this flat surface. The longer the time, the more the oxidized powder is deposited, and when the roller rotates, the edge of the sealing ring of the check ring, which is tightly attached to the sealing ring, is continuously ground by the oxidized powder, and finally, the sealing failure is caused.
In consideration of the limited installation space between the roll 300 and the bearing housing 200, the embodiment preferably has the outer ring body 11 of the waterproof ring 10 with a width of 48mm and the outer sidewall of the boss 22 with a height of 41.5 mm. Compared with the conventional sealing structure, the fitting dimension between the roll 300 and the bearing housing 200 is not changed, and the space is more fully utilized.
Further, the body part of the original retainer ring can be cut, so that the distance between the end faces of the end face body part of the protruding part is increased to 41.5 mm. So can avoid the retaining ring that the producer originally purchased to be wasted. Likewise, for the sealing ring, an expanded portion may be welded to the outer edge thereof, so that the width of the outer edge meets the requirements of the present embodiment. By adding a small amount of extension parts, the situation that the sealing ring is integrally replaced by a new sealing ring is avoided, and waste is also avoided.
Therefore, when the scheme of the embodiment is applied, a user can purchase or structurally modify the existing stock according to the self condition so as to meet the requirement.
Compared with the prior art, the scheme that this embodiment provided can make waterproof ring 10 cover into the degree of depth of manger plate ring 20 darker, has increased the inner space, can cushion flowing water, even if have ponding in the production process, also can be through the cooperation of outer loop 11 with boss 22 lateral wall, increase the drop pressure of water for water is difficult to upwards scurries. And boss 22 is higher than the bulge of retaining ring in prior art, and its water-retaining ability is better, and connecting seat 21 is lower than the height of the main part of current retaining ring, and flowing water is difficult to be higher than the two-thirds of boss 22 height, just also is difficult to spill into the inboard of boss 22, and highly lower can more do benefit to the drainage, even if general impurity is piled up and also is difficult to influence the drainage.
The first sealing member 30 can be used as a preliminary sealing member, which can primarily block powder from entering the space inside the boss 22, and can also play a certain role in blocking water. On this basis, the inner space of the boss 22 is further provided with two framework oil seals, so that impurities such as powder can be further prevented from entering the area between the roller 300 and the bearing, even if one is worn, the other can be blocked, and under the condition that the existing space is not changed, the space is more fully utilized.
That is, the present embodiment makes full use of the space without changing the size of the space between the roll 300 and the bearing housing 200, and further accomplishes the object of improving the sealing performance with a reduced change cost. In a longer production time, the sealing effect can be effectively guaranteed. Need not just need to clear up impurity such as flowing water and oxidation powder, wire drawing in the short time, reduced personnel intensity of labour and promoted the efficiency of processing, reduce the frequency of shutting down the maintenance. Is more beneficial to actual production.
To sum up, the rolling mill bearing box waterproof construction 100 of this application is through stretching into protection chamber 101 with boss 22 to dispose first sealing member 30 and second sealing member 40 respectively in the inside and outside both sides of boss 22, make the sealing performance between roll 300 and bearing box 200 promoted, and be difficult to the inefficacy. The bearing can be effectively prevented from being polluted, and normal work is guaranteed.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (9)
1. The utility model provides a rolling mill bearing box waterproof construction which characterized in that includes: the water-proof ring, the water-retaining ring, the first sealing element and the second sealing element;
the waterproof ring is used for sleeving the roller, the waterproof ring is provided with a protective cavity, the water retaining ring comprises a connecting seat and a boss, the boss is arranged on the connecting seat, the connecting seat is used for being connected with the bearing box, the boss stretches into the protective cavity, the outer side wall of the boss passes through the first sealing element and the sealed cooperation of the cavity wall on one side of the protective cavity, and the inner side wall of the boss passes through the second sealing element and the sealed cooperation of the cavity wall on the other side of the protective cavity.
2. The rolling mill bearing housing waterproofing structure according to claim 1, wherein said first sealing member is an O-ring, and said boss and/or said waterproofing ring is provided with a seal ring groove.
3. The waterproof structure for a bearing housing of a rolling mill according to claim 2, wherein the seal ring groove is opened 3mm below the end face of the boss.
4. The rolling mill bearing housing waterproof construction of claim 1, wherein the second seal is a skeleton oil seal.
5. The waterproof structure of a bearing box of a rolling mill according to claim 4, wherein two skeleton oil seals are arranged between the boss and the waterproof ring, and the two skeleton oil seals are sequentially arranged along the axial direction of the roller.
6. The rolling mill bearing housing waterproof structure of claim 1, wherein the waterproof ring comprises an outer ring body and an inner ring body, the outer ring body and the inner ring body are connected and enclose the protection cavity, and the width of the outer ring body is larger than 22 mm.
7. The rolling mill bearing housing waterproofing structure according to claim 6, wherein a cover-in depth of said outer ring body is 37 mm.
8. The rolling mill bearing housing waterproofing structure according to claim 1 wherein the height of the outer side wall of said boss is greater than 13.5 mm.
9. The rolling mill bearing housing waterproofing structure according to claim 8 wherein the height of the outer side wall of said boss is 41.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010753823.7A CN111842499A (en) | 2020-07-30 | 2020-07-30 | Waterproof structure of rolling mill bearing box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010753823.7A CN111842499A (en) | 2020-07-30 | 2020-07-30 | Waterproof structure of rolling mill bearing box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111842499A true CN111842499A (en) | 2020-10-30 |
Family
ID=72945513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010753823.7A Pending CN111842499A (en) | 2020-07-30 | 2020-07-30 | Waterproof structure of rolling mill bearing box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111842499A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100643172B1 (en) * | 2005-06-16 | 2006-11-10 | 주식회사 경도공업 | Sealling structure of roll chock |
| DE102006019448A1 (en) * | 2006-04-24 | 2007-10-25 | Sms Demag Ag | puller |
| CN101712047A (en) * | 2009-12-17 | 2010-05-26 | 天津津重重工机器设备制造有限公司 | Bar mill roller system sealing device |
| CN204294636U (en) * | 2014-12-05 | 2015-04-29 | 广东韶钢松山股份有限公司 | A kind of bar is remained silent the novel bearing box seal device of vertical mill |
| CN206382329U (en) * | 2016-12-01 | 2017-08-08 | 攀枝花钢城集团有限公司 | Sealing structure of shaft end for high rigidity short stress path rolling mill roll |
| CN108543812A (en) * | 2018-05-30 | 2018-09-18 | 武汉钢铁有限公司 | Antiseep bearing holder device for roll |
-
2020
- 2020-07-30 CN CN202010753823.7A patent/CN111842499A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100643172B1 (en) * | 2005-06-16 | 2006-11-10 | 주식회사 경도공업 | Sealling structure of roll chock |
| DE102006019448A1 (en) * | 2006-04-24 | 2007-10-25 | Sms Demag Ag | puller |
| CN101712047A (en) * | 2009-12-17 | 2010-05-26 | 天津津重重工机器设备制造有限公司 | Bar mill roller system sealing device |
| CN204294636U (en) * | 2014-12-05 | 2015-04-29 | 广东韶钢松山股份有限公司 | A kind of bar is remained silent the novel bearing box seal device of vertical mill |
| CN206382329U (en) * | 2016-12-01 | 2017-08-08 | 攀枝花钢城集团有限公司 | Sealing structure of shaft end for high rigidity short stress path rolling mill roll |
| CN108543812A (en) * | 2018-05-30 | 2018-09-18 | 武汉钢铁有限公司 | Antiseep bearing holder device for roll |
Non-Patent Citations (1)
| Title |
|---|
| 黄志坚: "《轧机轧辊与轴承使用维修技术》", 31 January 2008, 冶金工业出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20190070536A1 (en) | Filter with Shielded Internal Gasket | |
| CN111842499A (en) | Waterproof structure of rolling mill bearing box | |
| AU2004200518B2 (en) | Seal end plate | |
| CN212803827U (en) | Anti-leakage hydraulic oil cylinder | |
| CN108006292B (en) | From taking filterable fast row formula air valve of inhaling slowly | |
| CN201326741Y (en) | Novel seal structure used for main transmission | |
| CN107956886B (en) | From quick-suction slow-discharge type air valve with overhaul and filtration functions | |
| CN112709661A (en) | Top cover main shaft sealing water leakage inhibiting device of vertical shaft mixed flow type water turbine | |
| CN210147827U (en) | Grinding machine grinding fluid second grade filtration system | |
| CN201963885U (en) | Double-lip sealing ring | |
| CN209468787U (en) | Gas station's double containment waterproof load-bearing well | |
| CN218166208U (en) | Special water detection type filter element for gasoline of oiling machine and galvanized plate filter element end cover | |
| CN210410876U (en) | Cone crusher with dust keeper | |
| CN213064620U (en) | Sealing ring and sealing assembly | |
| CN105056687A (en) | Filter device for gas production | |
| CN220227831U (en) | Sealing protection device for vertical roller bearing seat | |
| CN217633985U (en) | Composite ball valve | |
| CN213870787U (en) | Four-seal bearing with sealing gasket for roller washing machine | |
| CN204554328U (en) | There is the oil lubricating system except water function | |
| CN220118437U (en) | High-pressure oil filter | |
| CN217784209U (en) | Improved structure of output oil seal of pinion shaft | |
| CN214235595U (en) | Supporting roller unit structure of 350T vertical ring rolling mill | |
| CN214130645U (en) | Silica flour recycle device among silicon processing waste water | |
| CN214972172U (en) | Water filter for casting | |
| CN102094976A (en) | Double-lip sealing ring |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201030 |