CN210292830U - Sliding plate type sealing structure for sintering machine trolley - Google Patents
Sliding plate type sealing structure for sintering machine trolley Download PDFInfo
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- CN210292830U CN210292830U CN201921409915.2U CN201921409915U CN210292830U CN 210292830 U CN210292830 U CN 210292830U CN 201921409915 U CN201921409915 U CN 201921409915U CN 210292830 U CN210292830 U CN 210292830U
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- flexible sealing
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- slide
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- 238000007789 sealing Methods 0.000 title claims abstract description 180
- 238000005245 sintering Methods 0.000 title claims abstract description 37
- 238000003825 pressing Methods 0.000 claims description 5
- 238000005299 abrasion Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 30
- 235000017491 Bambusa tulda Nutrition 0.000 description 30
- 241001330002 Bambuseae Species 0.000 description 30
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 30
- 239000011425 bamboo Substances 0.000 description 30
- 230000000694 effects Effects 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 206010066054 Dysmorphism Diseases 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model relates to a slide formula seal structure for sintering pallet, including set up in the sealed slide of platform truck bottom surface and be located the platform truck below and with sealed slide sealing contact's flexible sealing strip, the lower terminal surface of sealed slide is the arcwall face, the upper edge of flexible sealing strip and the arc department sealing contact on the sealed slide, flexible sealing strip presss from both sides tightly on the bellows girder through setting firmly a plurality of clamping device on the bellows girder. The utility model discloses a lower terminal surface that sets up sealed slide is convex, deformation phenomenon can not take place when hoist and mount trolley body, can reduce the damage of flexible sealing strip, when the trolley body off tracking, flexible sealing strip is close to the arc-shaped face of sealed slide, avoid appearing the damage of flexible sealing strip, and can the free compensation to the off tracking, it presss from both sides tightly to set up clamping device to flexible sealing strip, do benefit to the quick replacement of flexible sealing strip, have the phenomenon of leaking out of reduction sintering machine platform truck, increase sealed slide abrasion resistance, reduce company use cost's beneficial effect.
Description
Technical Field
The utility model relates to a sintering machine seals the field, specifically indicates a slide formula seal structure for sintering machine platform truck.
Background
The sintering machine is important equipment for treating blast furnace raw materials in steel plants, is an important part of steel working procedures, and provides high-quality ironmaking raw materials for blast furnaces through sintering. The air leakage of the sintering machine is the main reason of low sintering productivity and high process energy consumption. At present, the air leakage phenomenon of the sintering machine mainly occurs between sintering trolleys and gaps between the sintering trolleys and air boxes, the air leakage rate is up to more than 50 percent, not only energy is wasted and sintering noise is formed, but also the sintering productivity and the quality of sintered ores are seriously influenced.
At present, in the sealing structure form of the known sintering machine, one is that a sealing element at the upper part of a trolley is metal elastic, and a sliding plate is combined with the lower part of the trolley and is fixed by metal; another trolley upper sealing element is a fixing element which is fixed by metal and combined with the lower part of the trolley upper sealing element is flexible rubber. Due to the deviation phenomenon in the operation process of the sintering machine, the first structural metal and the metal are quickly abraded by friction, and are easy to rub, deform and fall off; the upper edge of the existing flexible sealing strip of the second structure is in angular contact with the trolley body outside the fixed sliding plate, so that the sealing strip is abraded and gnawed, the flexible sealing strip can be jammed at the included angle between the fixed sliding plate and the trolley body to cause the whole strip to be torn in a short time, air leakage seriously affects sintering production to go forward, and the sealing strip is troublesome to damage and replace.
Disclosure of Invention
The utility model is not enough to prior art, the utility model provides a slide formula seal structure for sintering pallet, the lower terminal surface through setting up sealed slide is convex, deformation phenomenon can not take place when hoist and mount platform truck, can reduce the damage of sealing strip, when the platform truck off tracking, the flexible sealing strip is close to the arc-shaped face of sealed slide, avoid appearing the damage of sealing strip, and can the free compensation to the off tracking, through increasing clamping device, can press from both sides tightly flexible sealing strip, and conveniently change flexible sealing strip, easily install simultaneously, wear-resisting effect has been increased, use cost is effectively reduced.
The utility model discloses a following technical scheme realizes, provide including set up in the sealed slide of platform truck bottom surface and be located the platform truck below and with sealed slide sealing contact's flexible sealing strip, the lower terminal surface of sealed slide is the arcwall face, the upper edge of flexible sealing strip and the arc department sealing contact on the sealed slide, flexible sealing strip presss from both sides tightly on the bellows girder through setting firmly a plurality of clamping device on the bellows girder.
According to the scheme, the sealing sliding plate is arranged in the groove in the ground of the trolley, the upper end face of the sealing sliding plate is a flat face, the flat face is in contact with the bottom face of the groove, the flexible sealing strip in sealing contact with the sealing sliding plate is further arranged below the trolley, and the phenomenon of air leakage of the trolley of the sintering machine is reduced through the sealing of the flexible sealing strip and the sealing sliding plate; the lower end face of the sealing sliding plate is arranged to be in the shape of an arc, so that damage to the flexible sealing strip can be reduced, deviation of the flexible sealing strip can be freely compensated in the arc-shaped face, the left end and the right end of the sealing sliding plate are symmetrically arranged, the sealing sliding plate is easy to install, one side is worn and the other side can be replaced for use, the wear-resisting effect is improved, and the use cost is effectively reduced; the upper edge of the flexible sealing strip is in sealing contact with the arc-shaped part on the sealing sliding plate, the flexible sealing strip is clamped on the air box main beam through a plurality of clamping devices fixedly arranged on the air box main beam, the clamping devices are transversely arranged along the flexible sealing strip, the flexible sealing strip is clamped by adjusting the clamping devices, if the flexible sealing strip is damaged, the flexible sealing strip can be quickly replaced by adjusting the corresponding clamping devices, and the phenomenon of air leakage of the sintering machine trolley is reduced.
As preferred, clamping device is including setting firmly the fixed block on the bellows girder and pressing from both sides tight a section of thick bamboo, the fixed block is located the both sides of flexible sealing strip respectively with pressing from both sides tight a section of thick bamboo, the one end threaded connection who keeps away from flexible sealing strip of a tight section of thick bamboo that presss from both sides has a spacing section of thick bamboo, radially being provided with two baffles in the spacing section of thick bamboo, form the clearing hole between two baffles, wear to be equipped with the push rod in the tight section of thick bamboo that presss from both sides, the one end that flexible sealing strip was kept away from to the push rod has set firmly the handle, there is the tight piece of clamp that compresses tightly.
This preferred scheme is through being located the both sides of flexible sealing strip respectively with fixed block and a tight section of thick bamboo of clamp, pushes up flexible sealing strip to the fixed block through the tight piece of the clamp in the tight section of thick bamboo of clamp, realizes the clamp of flexible sealing strip tightly, and the one end threaded connection who keeps away from flexible sealing strip through a tight section of thick bamboo of clamp has a spacing section of thick bamboo, radially being provided with two baffles in the spacing section of thick bamboo, forming the clearing hole between two baffles, wear to be equipped with the push rod in the tight section of thick bamboo of clamp, the one end that flexible sealing strip was kept away from to the push rod has set firmly the handle, the push rod other end has the tight piece of the clamp that compresses tightly flexible sealing strip. The length of handle is less than the length of clearing hole, and is greater than the width of clearing hole, pushes the handle into spacing section of thick bamboo baffle, and rotatory handle is spacing in spacing section of thick bamboo through the baffle with the handle, through the resilience force of spring, with the handle near on the baffle, spacing section of thick bamboo with press from both sides tight section of thick bamboo threaded connection, if spring force reduces, lead to reducing the clamp force of flexible sealing strip, carry out the secondary through rotatory spacing section of thick bamboo to flexible sealing strip and press from both sides tightly.
Preferably, the diameter of the clamping block is smaller than the inner diameter of the clamping cylinder, and the clamping block is in sliding connection with the clamping cylinder.
This preferred scheme is through setting up to be less than the internal diameter of a clamping section of thick bamboo with pressing from both sides tight piece diameter, presss from both sides tight piece and presss from both sides tight section of thick bamboo slip joint, presss from both sides tight piece and can press from both sides tight flexible sealing strip in a clamping section of thick bamboo or stretch out a clamping section of thick bamboo outward.
Preferably, a sleeve is fixedly arranged at one end, away from the flexible sealing strip, of the clamping block, and the spring is arranged in the sleeve in a penetrating mode.
This preferred scheme is through having set firmly the sleeve in the one end of pressing from both sides tight piece and keeping away from flexible sealing strip, wears to establish in the sleeve with the spring that presss from both sides tight piece rigid coupling, and the sleeve diameter is greater than the push rod diameter, and the sleeve plays the effect of direction to spring and push rod.
Preferably, the fixed end of the flexible sealing strip is positioned outside the vertical projection of the sealing sliding plate.
This preferred scheme is located outside the vertical projection of sealed slide through setting up flexible sealing strip stiff end, and the flexible sealing strip stretches out the section and is the arc and stretch into sealed slide and with sealed slide sealing contact, can increase the area of contact between flexible sealing strip and the sealed slide, reduces to leak out.
Preferably, the height of the circular arc shape of the lower end surface of the sealing sliding plate is set to be between one half and two thirds of the height of the sealing sliding plate.
According to the preferred scheme, the arc height of the lower end face of the sealing sliding plate is arranged between one half and two thirds of the height of the sealing sliding plate, the use performance of the sealing sliding plate can be improved, if the arc height is too high, the middle part of the sealing sliding plate is not wear-resistant, the service life of the sealing sliding plate is shortened, and if the arc height is too low, the abrasion of the flexible sealing strip and the sealing sliding plate can be increased.
Preferably, the lower end surface of the sealing sliding plate comprises a circular arc surface and flat bottom surfaces positioned on two sides of the circular arc surface, and the width of the two flat bottom surfaces is set to be between one sixth and one fifth of the width of the sealing sliding plate. This preferred scheme still is equipped with the flat bottom that is located the arc surface both sides through terminal surface down, and the width of two flat bottoms sets up to between one sixth to one fifth of sealed slide width, avoids because the phenomenon that sealed slide takes place deformation when hoisting sintering machine platform truck body.
The utility model has the advantages that: the lower end face through setting up sealed slide is convex, deformation can not take place when hoist and mount platform truck body, can reduce the damage of flexible sealing strip, when the platform truck body off tracking, flexible sealing strip is close to the arc surface of sealed slide, avoid appearing the damage of flexible sealing strip, and can the free compensation to the off tracking, sealed slide left side, right side both ends symmetry sets up, easily installation, can change the another side after wearing and tearing on one side and use, press from both sides tightly flexible sealing strip through setting up clamping device, be favorable to the quick replacement of flexible sealing strip, have the sintering machine platform truck phenomenon of leaking out, increase sealed slide abrasion resistance, reduce company use cost's beneficial effect.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic perspective view of the sealing slide plate of the present invention;
fig. 3 is a top view of the clamping device of the present invention;
fig. 4 is a right side view of the limiting cylinder of the present invention.
Shown in the figure:
1. the sealing device comprises a sealing sliding plate, 2, a fixing bolt, 3, a trolley body, 4, a fixing block, 5, a flexible sealing strip, 6, trolley wheels, 7, a main bellows beam, 8, a bellows beam, 9, a circular arc surface, 10, a flat bottom surface, 11, a clamping block, 12, a limiting cylinder, 13, a sleeve, 14, a push rod, 15, a handle, 16, a baffle, 17, a spring, 18 and a clamping cylinder.
Detailed Description
In order to clearly illustrate the technical features of the present solution, the present solution is explained below by way of specific embodiments.
As shown in fig. 1-4, the sliding plate type sealing structure for the sintering machine trolley comprises a sealing sliding plate 1 arranged on the bottom surface of the trolley and a flexible sealing strip 5 which is located below the trolley and is in sealing contact with the sealing sliding plate 1, wherein the lower end surface of the sealing sliding plate 1 is an arc-shaped surface, and the upper edge of the flexible sealing strip 5 is in sealing contact with the arc-shaped part on the sealing sliding plate 1. A sealing sliding plate 1 is arranged in a groove on the ground of the trolley, the upper end surface of the sealing sliding plate 1 is a flat surface, the flat surface is contacted with the bottom surface of the groove, a flexible sealing strip 5 which is in sealing contact with the sealing sliding plate 1 is also arranged below the trolley, and the phenomenon of air leakage of the trolley of the sintering machine is reduced through the sealing of the flexible sealing strip 5 and the sealing sliding plate 1; the lower end face of the sealing sliding plate 1 is arc-shaped, damage to the flexible sealing strips 5 can be reduced, deviation of the flexible sealing strips 5 can be freely compensated in the arc-shaped face 9, the left end and the right end of the sealing sliding plate are symmetrically arranged, the sealing sliding plate is easy to install, the other side of the sealing sliding plate can be replaced after the sealing sliding plate is worn on one side, the wear-resisting effect is improved, and the use cost is effectively reduced.
The flexible sealing strip 5 is clamped on the air box main beam 7 through 3 clamping devices fixedly arranged on the air box main beam 7, the clamping devices are transversely arranged along the flexible sealing strip, the flexible sealing strip 5 is clamped by adjusting the clamping devices, if the flexible sealing strip 5 is damaged, the flexible sealing strip 5 can be quickly replaced by adjusting the corresponding clamping devices, and the phenomenon of air leakage of a sintering machine trolley is reduced. The trolley wheels 6 are arranged on two sides of the trolley. In production, the flexible sealing strip 5 and the sealing slide 1 are sucked together by the negative pressure inside the bellows 8.
The clamping device comprises a fixed block 4 and a clamping cylinder 19 which are fixedly arranged on the main beam 7 of the air box, the fixed block 4 and the clamping cylinder 19 are respectively positioned at two sides of the flexible sealing strip 5, the flexible sealing strip is pushed onto the fixed block 4 through a clamping block in the clamping cylinder to realize the clamping of the flexible sealing strip, one end of the clamping cylinder 19, which is far away from the flexible sealing strip 5, is in threaded connection with a limiting cylinder 12, two baffles 16 are radially arranged in the limiting cylinder 12, a through hole is formed between the two baffles, a push rod 14 penetrates through the clamping cylinder 19, one end, which is far away from the flexible sealing strip 5, of the push rod 14 is fixedly provided with a handle 15, the other end of the push rod 14 is connected with a clamping block 11 which is used for compressing the flexible sealing strip 5 through a spring 17, the push rod is pushed through the handle, the push rod 14; the length of handle 15 is less than the length of clearing hole, and is greater than the width of clearing hole, in pushing handle 15 into spacing section of thick bamboo 12, rotatory handle 15, it is spacing in spacing section of thick bamboo 12 with handle 15 through baffle 16, through the resilience force of spring, with handle 15 near on the baffle, spacing section of thick bamboo 12 with press from both sides tight section of thick bamboo 11 threaded connection, if spring force reduces, lead to reducing the clamp force of flexible sealing strip 5, carry out the secondary through rotatory spacing section of thick bamboo 12 and press from both sides tight flexible sealing strip 5.
The diameter of the clamping block 11 is set to be smaller than the inner diameter of the clamping cylinder, the clamping block 11 is in sliding connection with the clamping cylinder 18, and the clamping block 11 can clamp the flexible sealing strip 5 in the clamping cylinder 18 or extend out of the clamping cylinder.
A sleeve 13 is fixedly arranged at one end of the clamping block 11, which is far away from the end 5 of the flexible sealing strip, a spring 17 fixedly connected with the clamping block 11 and a part of push rod fixedly connected with the spring 17 are arranged in the sleeve 13, the diameter of the sleeve is larger than that of the push rod, and the sleeve plays a role in guiding the spring 17 and the push rod 14.
The fixed end of the flexible sealing strip 5 is positioned outside the vertical projection of the sealing sliding plate 1, the extending section of the flexible sealing strip 5 is in arc-shaped contact with the sealing sliding plate 1, the contact area between the flexible sealing strip 5 and the sealing sliding plate 1 can be increased, and air leakage is reduced.
The arc height of the lower end face of the sealing sliding plate 1 is set to be two thirds of the height of the sealing sliding plate, the use performance of the sealing sliding plate 1 can be improved, if the arc height is too high, the middle part of the sealing sliding plate 1 is not wear-resistant, the service life of the sealing sliding plate 1 is shortened, and if the arc height is too low, the abrasion of the flexible sealing strip 5 and the sealing sliding plate 1 can be increased.
The lower end surface of the sealing sliding plate 1 comprises an arc surface 9 and flat bottom surfaces 10 positioned on two sides of the arc surface, and the width of the two flat bottom surfaces 10 is set to be one fifth of the width of the sealing sliding plate 1. The flat bottom surfaces 10 positioned on two sides of the arc surface are further arranged on the lower end surface, and the width of the flat bottom surfaces 10 is set to be one fifth of the width of the sealing sliding plate 1, so that the phenomenon that the sealing sliding plate 1 deforms when the sintering machine trolley body 3 is hoisted is avoided.
Still including installing fixing bolt 2 on the sealed slide up end, seted up two screw holes along sealed slide axial on the sealed slide up end, two screw hole female connection have two fixing bolt 2, fix sealed slide 1 in sintering machine platform truck body lower extreme recess through two fixing bolt 2, prevent that sealed slide 1 from removing.
The utility model discloses clamping device use: promote the handle, through the clearing hole, extend the handle in a spacing section of thick bamboo, the push rod drives and presss from both sides tight piece and press from both sides tightly flexible sealing strip, and rotatory handle is injectd the handle in a spacing section of thick bamboo, long-term the use, if spring elasticity reduces, can rotate a spacing section of thick bamboo, drives the handle through a spacing section of thick bamboo, carries out the secondary to flexible sealing strip and presss from both sides tightly.
Dysmorphism slide among the prior art takes place to warp easily when hoist and mount platform truck, lead to sealed effect to reduce, flexible sealing strip appears damaging, sealed slide's lower terminal surface set up to convex, can not take place deformation phenomenon when hoist and mount platform truck body, can reduce flexible sealing strip's damage, when the platform truck body off tracking, flexible sealing strip is close to the arc-shaped face of sealed slide, avoid appearing flexible sealing strip's damage, and can the free compensation to the off tracking, sealed slide left and right both ends symmetry sets up, easily installation, can change the another side after wearing and tearing on one side and using, have and reduce sintering machine platform truck and leak out the wind phenomenon, increase sealed slide wearability, reduce the beneficial effect of company use cost, through installing clamping device, can adjust corresponding clamping device, carry out quick replacement to flexible sealing strip.
Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art should also understand that the changes/modifications/additions or substitutions made within the scope of the present invention should also belong to the protection scope of the present invention.
Claims (8)
1. The utility model provides a sintering is slide formula seal structure for board car which characterized in that: including setting up in sealed slide (1) of platform truck bottom surface and being located the platform truck below and with sealed slide (1) sealing contact's flexible sealing strip (5), the lower terminal surface of sealed slide (1) is the arcwall face, the upper edge of flexible sealing strip (5) and the arc department sealing contact on sealed slide (1), and flexible sealing strip (5) press from both sides tightly on bellows girder (7) through setting firmly a plurality of clamping device on bellows girder (7).
2. The slide plate type sealing structure for the sintering machine trolley according to claim 1, characterized in that: the lower end face of the sealing sliding plate (1) is arc-shaped.
3. The slide plate type sealing structure for the sintering machine trolley according to claim 1, characterized in that: the clamping device comprises a fixed block (4) and a clamping barrel (19) which are fixedly arranged on an air box main beam (7), the fixed block (4) and the clamping barrel (19) are respectively positioned at two sides of a flexible sealing strip (5), one end, far away from the flexible sealing strip (5), of the clamping barrel (19) is in threaded connection with a limiting barrel (12), two baffles (16) are arranged in the limiting barrel (12) along the radial direction, a through hole is formed between the two baffles, a push rod (14) penetrates through the clamping barrel (19), one end, far away from the flexible sealing strip (5), of the push rod (14) is fixedly provided with a handle (15), and the length of the handle (15) is smaller than that of the through hole and is larger than that of the through hole; the other end of the push rod (14) is connected with a clamping block (11) for pressing the flexible sealing strip (5) through a spring (17).
4. The slide plate type sealing structure for a sintering machine trolley according to claim 3, wherein: the diameter of the clamping block (11) is smaller than the inner diameter of the clamping cylinder, and the clamping block (11) is in sliding connection with the clamping cylinder (19).
5. The slide plate type sealing structure for a sintering machine trolley according to claim 3, wherein: one end, far away from the flexible sealing strip (5), of the clamping block (11) is fixedly provided with a sleeve (13), and the spring (17) penetrates through the sleeve.
6. The slide plate type sealing structure for the sintering machine trolley according to claim 1, characterized in that: the fixed end of the flexible sealing strip (5) is positioned outside the vertical projection of the sealing sliding plate (1).
7. The slide plate type sealing structure for the sintering machine trolley according to claim 1, characterized in that: the lower end surface of the sealing sliding plate (1) comprises an arc surface (9) and flat bottom surfaces (10) positioned on two sides of the arc surface (9), and the width of the flat bottom surfaces (10) is set to be between one sixth and one fifth of the width of the sealing sliding plate (1).
8. The slide plate type sealing structure for a sintering machine trolley according to claim 7, wherein: the arc-shaped height of the lower end face of the sealing sliding plate (1) is set to be between one half and two thirds of the height of the sealing sliding plate (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921409915.2U CN210292830U (en) | 2019-08-28 | 2019-08-28 | Sliding plate type sealing structure for sintering machine trolley |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921409915.2U CN210292830U (en) | 2019-08-28 | 2019-08-28 | Sliding plate type sealing structure for sintering machine trolley |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210292830U true CN210292830U (en) | 2020-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921409915.2U Expired - Fee Related CN210292830U (en) | 2019-08-28 | 2019-08-28 | Sliding plate type sealing structure for sintering machine trolley |
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| Country | Link |
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| CN (1) | CN210292830U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114739168A (en) * | 2022-03-18 | 2022-07-12 | 北京金都泰拓冶金技术研究有限公司 | Sintering machine flexible slideway sealing device and sintering machine |
-
2019
- 2019-08-28 CN CN201921409915.2U patent/CN210292830U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114739168A (en) * | 2022-03-18 | 2022-07-12 | 北京金都泰拓冶金技术研究有限公司 | Sintering machine flexible slideway sealing device and sintering machine |
| CN114739168B (en) * | 2022-03-18 | 2024-01-30 | 北京金都泰拓冶金技术研究有限公司 | Flexible slideway sealing device of sintering machine and sintering machine |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200410 |