CN211838176U - Assembled wear-resisting squeeze roll roller shell - Google Patents
Assembled wear-resisting squeeze roll roller shell Download PDFInfo
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- CN211838176U CN211838176U CN202020470917.9U CN202020470917U CN211838176U CN 211838176 U CN211838176 U CN 211838176U CN 202020470917 U CN202020470917 U CN 202020470917U CN 211838176 U CN211838176 U CN 211838176U
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Abstract
The utility model relates to a squeeze roll roller shell technical field specifically is a wear-resisting squeeze roll roller shell of assembled, including roll body, wear-resisting piece, retaining ring and fastening bolt. The roller body is externally provided with wear-resistant blocks, the wear-resistant blocks are sequentially connected along the length direction of the roller sheet and then have the same length as the roller sheet, and the wear-resistant blocks are sequentially connected along the circumferential direction of the roller sheet to form a closed circular ring. The roll body comprises a roll base body, a dovetail groove, threaded holes, shaft holes and a key groove, the wear-resistant block comprises a wear-resistant base body, a dovetail convex edge, a stud, a groove and a surfacing layer, the dovetail groove is matched with the dovetail convex edge to connect the roll body and the wear-resistant block together, the fastening bolt penetrates through the bolt hole in the retainer ring to be matched with the threaded holes in the roll body, and the retainer ring, the roll body and the wear-resistant block are assembled into a whole. The roller sleeve is formed by assembling a plurality of wear-resistant blocks in a split manner, and can be detached and maintained independently; the surfacing layer can be subjected to surfacing maintenance for multiple times, so that resources are saved; the stud is firm and reliable and cannot fall off; the spherical segment-shaped groove forms a self-growing material pad on the surface, so that the impact of hard substances such as iron blocks and the like is avoided.
Description
Technical Field
The utility model relates to a squeeze roll roller shell technical field specifically is a wear-resisting squeeze roll roller shell of assembled.
Background
The roller press is widely applied to metallurgy, chemical industry, mine and coal industry, has the characteristics of high efficiency and energy conservation, is applied to a powder production line for graded scattering, and can improve the production efficiency of a subsequent ball mill. The working principle of the roller press is that materials are fed from the upper parts of two rollers of the roller press, are continuously brought between extrusion rollers which rotate oppositely and synchronously, and are extruded and crushed under the action of high-strength pressure stress, so that the materials are changed into compact, flat and crack-filled cakes which are discharged from the lower part of the machine. The core part of the roller press is a squeeze roller, a roller sleeve of the squeeze roller is directly contacted with materials, the roller sleeve bears severe high-stress abrasive wear and stress fatigue damage in the whole working process, and the normal production of material refinement is seriously influenced by the poor wear resistance and fatigue resistance of the roller sleeve.
In order to prolong the service life of the roller sleeve, the roller sleeve structure commonly used at present has three types: composite casting roller sleeve, build-up welding roller sleeve and stud roller sleeve. The composite casting roller sleeve has a complex preparation method, and once the roller sleeve is damaged, only a new roller can be replaced, so that the resource waste is serious; the surfacing roller sleeve can be repaired and used for multiple times, but because the damaged part and the damaged degree of the roller sleeve are different, the roller sleeve needs to be repaired in a halt mode when being damaged at one part, the time consumption is high, and the production efficiency is low; the stud roller sleeve has the best wear resistance and is widely applied to the material grinding industry. However, the following problems exist in the production process: firstly, if the roller sleeve is in interference fit with the hard alloy stud, the stud is directly embedded in a hole formed in the roller sleeve, the roller sleeve body and the stud are worn synchronously in operation, when the worn roller sleeve needs to be repaired, the stud hole can be damaged, and the stud cannot be directly installed, so that the roller sleeve cannot be effectively repaired on line, the worn extrusion roller can only be integrally returned to a manufacturing plant for repairing, the roller sleeve is replaced, the roller sleeve needs to be manufactured again and the stud hole needs to be processed, and the period and the cost of equipment maintenance are increased; secondly, if the hard alloy stud and the roller sleeve are connected by a brazing method (for example, a Chinese patent with the application number of 201110351224.3, the application date is 2011, 11 and 8), but the brazing connection strength is low, the temperature of the extrusion roller is high after the extrusion roller is used for a long time, and the brazing filler metal is easy to melt and lose efficacy, so that the stud falls off.
When the roller press is used for magnetic materials such as iron ores and iron ore concentrates, the removal of iron blocks in the materials is difficult, particularly small iron blocks buried in the deep parts of the materials, the small iron blocks can cause fatal damage to roller surfaces after entering a roller mill, the phenomenon that the roller surfaces are seriously damaged is very common, and the service life of equipment is greatly influenced.
Chinese patent application No. 201120459716.X discloses a novel extrusion roller class roller face structure (application date is 2011 11 months 18 days), is equipped with crisscross distribution post hole and recess at the surface of roller shell, and the stud sets up in the post hole with clearance fit form and through the adhesive, can form one deck autogenous formula material pad on the roller shell surface when equipment load operation. However, the technical scheme has the following defects: firstly, the studs are arranged in the stud holes in a clearance fit mode through the adhesive, and the temperature of the extrusion roller rises after long-term use, so that the adhesive is liquefied and lost, and the studs fall off; secondly, the roller sleeve adopts an integral structure, and when one part is damaged, the whole machine is required to be stopped for maintenance, so that the production efficiency is reduced.
The chinese patent application No. 201520471374.1 discloses a removable squeeze roll stud roll surface (application date is 2015 year 7 month 3 days), is equipped with the welt preformed hole on the roller shell, is equipped with the stud welt in the welt preformed hole again, and stud welt upper end is equipped with the stud hole again, reaches the purpose that can in time change the stud. However, the scheme has the following technical defects: firstly, the structure is complex, the roller sleeve lining plate is densely provided with the preformed holes, the stud lining plate is arranged in the preformed holes, and the studs are arranged on the stud lining plate, so that the connection mode can greatly reduce the overall mechanical strength of the squeeze roller and obviously reduce the service life of the squeeze roller; secondly, the liner plate is fixed by gluing after being in clearance fit with the extrusion roller body, the stud liner plate is fixedly connected with the preformed hole of the liner plate through an adhesive, and the two layers of connection adopt a gluing form with low strength and cannot bear the working condition of high-pressure operation of the extrusion roller; if the lining plate connected with the squeeze roller is damaged, the whole lining plate needs to be replaced, so that resources are wasted, and the maintenance period is long; and fourthly, in the operation of magnetic materials such as iron ore or iron ore concentrate and the like, the removal of iron blocks in the materials is difficult, and the small iron blocks can cause fatal damage to the roller sleeve after entering the roller mill.
Chinese patent application No. 201521076172.3 discloses a roller mill lining plate and squeeze roller (application date is 2015, 12, 21), which changes the integral structure into a split structure, facilitating partial replacement and maintenance. However, the scheme has the following technical defects: firstly, the liner plate of the roller mill is in a narrow strip shape and still has a large area after penetrating through the length direction of the roller sleeve, and the whole liner plate needs to be replaced when one part is damaged, thereby wasting resources; secondly, a stud structure is not adopted, so that the wear resistance and working condition applicability of the lining plate are difficult to ensure; and thirdly, in the operation of magnetic materials such as iron ore or iron ore concentrate, the removal of iron blocks in the materials is difficult, and the small iron blocks can cause fatal damage to the roller sleeve after entering the roller mill.
In summary, in the prior art, the manufacturing scheme of the squeeze roll sleeve has the following disadvantages: firstly, the roller sleeve is of an integral structure, and when one part is damaged, the roller sleeve needs to be stopped for long-term maintenance or replacement, so that the period is long and the efficiency is low; secondly, the stud and the substrate are connected in a glue joint mode and are easy to loosen and fall off; thirdly, the stud substrate is seriously worn after being used for a period of time, the stud is exposed, and the maintenance is difficult; fourthly, if small iron blocks are mixed in the materials, the surface of the roller sleeve is easily damaged, and the repair period is long.
How to solve the above problems is a preoccupation of workers in the technical field.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a wear-resisting squeeze roll roller shell of assembled solves following technical problem: firstly, the roller sleeve is assembled by a plurality of wear-resistant blocks in a split manner, and can be quickly replaced after being partially worn; secondly, the wear-resistant block is mechanically connected with the roller body, so that the strength is high; the stud and the wear-resistant layer are integrated and cannot fall off; fourthly, the wear-resistant layer of the wear-resistant block can be repaired by overlaying after being damaged; and fifthly, the surface of the roller sleeve cannot be damaged when small iron blocks are mixed in the material.
The utility model adopts the following technical scheme:
the utility model provides a wear-resisting squeeze roll roller shell of assembled, includes roll body, wear-resisting piece, retaining ring and fastening bolt, the roll body is equipped with wear-resisting piece outward, wear-resisting piece is the same with roll body length along roll body length direction connects gradually back total length, and wear-resisting piece connects gradually along the roll body circumferencial direction and forms the ring.
The roller body comprises a roller body main body, dovetail grooves, threaded holes, shaft holes and key grooves, the threaded holes are formed in two ends of the roller body main body, the dovetail grooves, the shaft holes and the key grooves are formed in the cross section perpendicular to the length direction of the roller body, the dovetail grooves are evenly distributed along the circumferential direction of the cross section perpendicular to the length direction of the roller body, the shaft holes are located in the center of the roller body, the key grooves are located on the inner side surface of the shaft holes, and the dovetail grooves, the shaft holes and the key grooves penetrate through the roller body along the length direction; the roller body is made of alloy steel, and has high strength and good toughness.
Wear-resisting piece includes wear-resisting base member, forked tail bead, stud, recess and surfacing layer, wear-resisting base member lower part is equipped with the forked tail bead, and wear-resisting base member upper portion is equipped with the stud hole, is equipped with the stud in the stud hole, and the stud exceeds wear-resisting base member upper surface, is equipped with the surfacing layer between the stud, the stud is cylindricly, and open the lower part has the recess ring along the circumferencial direction, the recess ring is in the surfacing layer, surfacing layer upper portion is equipped with the recess, and the thickness of surfacing layer and the stud expose wear-resisting base member's height equal, stud and the even interval distribution of recess.
The dovetail groove is connected with the dovetail convex rib in a matched mode, and the roller body and the wear-resistant block are assembled together.
The retaining ring includes circle body, bolt hole and centre bore, the retaining ring has two, is located the both ends of roll body respectively.
The fastening bolt penetrates through the bolt hole to be matched with the threaded hole, and the retainer ring, the roller body and the wear-resisting block are assembled into a whole.
The diameter of the stud is 5mm-10mm, and the stud is made of hard alloy.
The thickness of the surfacing layer is 15mm-20mm, and the surfacing layer is manufactured by adopting a wear-resistant welding rod or a wear-resistant welding wire.
The groove is in a ball segment shape, the diameter of a ball where the ball segment is located is 1.5-2.0 times of the diameter of the stud, and the height of the ball segment is 0.25-0.35 times of the thickness of the overlaying layer.
The utility model discloses following beneficial technological effect has:
1. the roller sleeve adopts the split assembled type of the wear-resisting blocks, when the damage condition occurs, only one wear-resisting block corresponding to the roller sleeve is detached and replaced independently, online maintenance and overall replacement are not needed, the roller sleeve can be installed quickly, the maintenance time is shortened, the working efficiency is improved, and the maintenance cost is reduced.
2. Adopt forked tail recess and forked tail bead complex mechanical connection mode between wear-resisting piece and the roll body, joint strength is high, can bear the operation under the squeeze roll high pressure.
3. The stud lower part is installed in the wear-resisting base member of build-up welding layer lower part, and upper portion and build-up welding layer form an organic whole, and the stud lower part is opened has also to be in the build-up welding layer along the recess ring of circumference, has guaranteed that the installation of stud can not drop firmly.
4. Because the wear-resisting piece is small, can stock, can change immediately after the wear-resisting piece on the squeeze roll damages, it is minimum to production influence, and can also the recycle after the build-up welding of wear-resisting piece is damaged to the build-up welding restoration.
5. The roller sleeve surface is distributed with the segment-shaped grooves which are arranged in a staggered mode, a layer of autogenous material pad can be formed on the surface of the roller sleeve when the equipment is in load operation, and the material pad bears the impact of hard substances such as abrasion and iron blocks.
Drawings
FIG. 1 is a front view of an assembled wear-resistant squeeze roller shell of the present invention;
FIG. 2 is a left side view of FIG. 1;
FIG. 3 is a cross-sectional view taken along the line A-A in FIG. 1;
FIG. 4 is an enlarged view of a portion of FIG. 3 at A;
fig. 5 is a left side view of the roller body (reference view to fig. 1);
FIG. 6 is a left side view of the retainer ring (with reference to FIG. 1);
fig. 7 is a front view of the wear block (90 ° rotated counterclockwise from the reference view of fig. 1);
fig. 8 is a sectional view taken along the plane B-B in fig. 7.
Description of reference numerals: 1. a roller body; 1-1, a roller body main body; 1-2, dovetail grooves; 1-3, a threaded hole; 1-4, shaft hole; 1-5, a key slot; 2. a wear-resistant block; 2-1, wear-resistant matrix; 2-2, dovetail ribs; 2-3, stud; 2-4, a groove; 2-5 surfacing layers; 3. a retainer ring; 3-1, a ring body; 3-2, bolt holes; 3-3, a central hole; 4. and fastening the bolt.
Detailed Description
The technical solution of the present invention is described in further detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following description.
As shown in fig. 1 to 8, an assembled wear-resisting squeeze roll sleeve comprises a roll body 1, wear-resisting blocks 2, a retainer ring 3 and fastening bolts 4, wherein the wear-resisting blocks 2 are arranged outside the roll body 1, the wear-resisting blocks 2 are sequentially connected along the length direction of the roll body 1, the total length of the wear-resisting blocks is equal to that of the roll body 1, and the wear-resisting blocks 2 are sequentially connected along the circumferential direction of the roll body 1 to form a circular ring.
The roller body 1 comprises a roller body main body 1-1, dovetail grooves 1-2, threaded holes 1-3, shaft holes 1-4 and key grooves 1-5, the threaded holes 1-3 are formed in two ends of the roller body main body 1-1, the dovetail grooves 1-2, the shaft holes 1-4 and the key grooves 1-5 are formed in the cross section perpendicular to the length direction of the roller body 1, the dovetail grooves 1-2 are evenly distributed along the circumferential direction of the cross section perpendicular to the length direction of the roller body 1, the shaft holes 1-4 are located in the center of the roller body 1, the key grooves 1-5 are located on the inner side face of the shaft holes 1-4, and the dovetail grooves 1-2, the shaft holes 1-4 and the key grooves 1-5 penetrate through the roller body 1 along the length direction; the dovetail groove 1-2, the shaft hole 1-4 and the key groove 1-5 penetrate through the roller body 1 along the length direction, and the roller body 1 is made of alloy steel, so that the roller body is high in strength and good in toughness.
The wear-resistant block 2 is in a fan-shaped annular shape and comprises a wear-resistant base body 2-1, dovetail ribs 2-2, studs 2-3, grooves 2-4 and surfacing layers 2-5, the dovetail ribs 2-2 are arranged on the lower portion of the wear-resistant base body 2-1, stud holes are formed in the upper portion of the wear-resistant base body 2-1, studs 2-3 are arranged in the stud holes, the studs 2-3 are higher than the upper surface of the wear-resistant base body 2-1, the diameter of the studs 2-3 is 5mm-10mm, and the wear-resistant block is made of hard alloy; the surfacing layers 2-5 are arranged between the studs 2-3, the studs 2-3 are cylindrical, the lower parts of the studs are provided with groove rings along the circumferential direction, the groove rings are positioned in the surfacing layers 2-5, the thickness of the surfacing layers 2-5 is 15mm-20mm, the studs are manufactured by adopting a wear-resistant surfacing welding rod or welding wire in a surfacing mode, the upper parts of the surfacing layers 2-5 are provided with grooves 2-4, the lower parts of the studs 2-3 are arranged in a wear-resistant matrix 2-1 at the lower parts of the surfacing layers 2-5, the upper parts of the studs and the surfacing layers 2-5 are integrated, the groove rings along the circumferential direction are also positioned in the surfacing layers 2-5 at the lower parts of the studs, the studs 2-3 are ensured to be firmly installed and not to fall off easily, the grooves 2-4 are in a segment shape, the diameter of a segment is 1.5-2.0 times of the diameter of the studs 2-3, and the height of the segment is 0.25-, the thickness of the surfacing layer 2-5 is equal to the height of the stud 2-3 exposed out of the wear-resistant matrix 2-1, and the stud 2-3 and the groove 2-4 are uniformly distributed at intervals; the roller sleeve surface is provided with the segment-shaped grooves 2-4 distributed on the roller surface in a staggered manner, a layer of autogenous material pad is formed on the roller sleeve surface when the equipment is in load operation, and the material pad bears the impact of hard substances such as abrasion and iron blocks, and the like, and the forming speed of the material pad is high, so that the abrasion resistance and the service life of the roller sleeve are improved, the impact resistance of hard substances of the roller sleeve stud 2-3 is improved, and the surface of the roller sleeve cannot be damaged if small iron blocks are mixed in the material.
Dovetail grooves 1-2 and dovetail convex ribs 2-2 are connected in a matched mode, the roller body 1 and the wear-resistant blocks 2 are assembled together, the wear-resistant blocks 2 are connected with the roller body 1 in a mechanical connection mode of matching the dovetail grooves 1-2 and the dovetail convex ribs 2-2, the connection strength is high, and the operation of the extrusion roller under high pressure can be borne.
The retainer ring 3 comprises a ring body 3-1, bolt holes 3-2 and a central hole 3-3, and two retainer rings 3 are respectively positioned at two ends of the roller body 1.
And the fastening bolt 4 penetrates through the bolt hole 3-2 to be matched with the threaded hole 1-3, so that the retainer ring 3, the roller body 1 and the wear-resisting block 2 are assembled into a whole. The roller sleeve adopts the 2 components of a whole that can function independently assembled of the wear-resisting piece of polylith, when having the bad situation to take place, can only dismantle alone a wear-resisting piece 2 that corresponds and get off to change, does not need online maintenance and whole change, can install fast and reduce maintenance duration and can improve the availability factor, reduce and use the maintenance cost. Because the wear-resisting block 2 is small in size, the wear-resisting block can be stored, if the wear-resisting block 2 on the squeeze roll is damaged, the wear-resisting block can be replaced immediately, the influence on production is extremely small, and the build-up welding layer 2-5 of the wear-resisting block 2 can be reused after being repaired by build-up welding after being damaged.
The key grooves 1-5 are used for installing keys to connect the roller sleeve with the roller shaft of the squeeze roller.
The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention are all included in the scope of the present invention.
Claims (4)
1. The utility model provides an assembled wear-resisting squeeze roll roller shell which characterized in that: the wear-resistant roller comprises a roller body (1), wear-resistant blocks (2), check rings (3) and fastening bolts (4), wherein the wear-resistant blocks (2) are arranged outside the roller body (1), the wear-resistant blocks (2) are sequentially connected along the length direction of the roller body (1), the total length of the wear-resistant blocks is the same as that of the roller body (1), and the wear-resistant blocks (2) are sequentially connected along the circumferential direction of the roller body (1) to form a circular ring;
the roller body (1) comprises a roller body main body (1-1), dovetail grooves (1-2), threaded holes (1-3), shaft holes (1-4) and key grooves (1-5), the two ends of the roller body main body (1-1) are provided with the threaded holes (1-3), a dovetail groove (1-2), a shaft hole (1-4) and a key groove (1-5) are arranged on the cross section vertical to the length direction of the roller body (1), the dovetail grooves (1-2) are uniformly distributed along the circumferential direction of the transverse section in the length direction vertical to the roller body (1), the shaft hole (1-4) is positioned at the center of the roller body (1), the key groove (1-5) is positioned on the inner side surface of the shaft hole (1-4), the dovetail groove (1-2), the shaft hole (1-4) and the key groove (1-5) penetrate through the roller body (1) along the length direction;
the wear-resistant block (2) comprises a wear-resistant base body (2-1), dovetail beads (2-2), studs (2-3), grooves (2-4) and surfacing layers (2-5), the dovetail beads (2-2) are arranged on the lower portion of the wear-resistant base body (2-1), stud holes are formed in the upper portion of the wear-resistant base body (2-1), studs (2-3) are arranged in the stud holes, the studs (2-3) are higher than the upper surface of the wear-resistant base body (2-1), surfacing layers (2-5) are arranged between the studs (2-3), the studs (2-3) are cylindrical, a groove ring along the circumference is formed in the lower portion of each stud hole and located in the surfacing layers (2-5), the grooves (2-4) are formed in the upper portions of the surfacing layers (2-5), and the thickness of the surfacing layers (2-5) and the thickness of the studs (2-3) are exposed out of the wear-resistant base body (2-1 The studs (2-3) and the grooves (2-4) are uniformly distributed at intervals;
the dovetail grooves (1-2) are matched and connected with the dovetail ribs (2-2), and the roller body (1) and the wear-resistant block (2) are assembled together;
the retainer ring (3) comprises a ring body (3-1), bolt holes (3-2) and a central hole (3-3), and two retainer rings (3) are respectively positioned at two ends of the roller body (1);
the fastening bolt (4) penetrates through the bolt hole (3-2) to be matched with the threaded hole (1-3), and the retainer ring (3), the roller body (1) and the wear-resisting block (2) are assembled into a whole.
2. The assembled wear-resistant squeeze roll shell of claim 1, wherein: the diameter of the stud (2-3) is 5mm-10 mm.
3. The assembled wear-resistant squeeze roll shell of claim 1, wherein: the thickness of the surfacing layers (2-5) is 15mm-20 mm.
4. The assembled wear-resistant squeeze roll shell of claim 1, wherein: the grooves (2-4) are in the shape of segments, the diameter of the sphere of the segments is 1.5-2.0 times of that of the studs (2-3), and the height of the segments is 0.25-0.35 times of the thickness of the surfacing layer (2-5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020470917.9U CN211838176U (en) | 2020-04-03 | 2020-04-03 | Assembled wear-resisting squeeze roll roller shell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020470917.9U CN211838176U (en) | 2020-04-03 | 2020-04-03 | Assembled wear-resisting squeeze roll roller shell |
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| Publication Number | Publication Date |
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| CN211838176U true CN211838176U (en) | 2020-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020470917.9U Expired - Fee Related CN211838176U (en) | 2020-04-03 | 2020-04-03 | Assembled wear-resisting squeeze roll roller shell |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113249851A (en) * | 2021-06-07 | 2021-08-13 | 青岛铠硕机械科技有限公司 | Water jet loom convenient to maintenance is changed thorn skin spindle nose |
| CN114939472A (en) * | 2022-05-23 | 2022-08-26 | 郑州机械研究所有限公司 | Wear-resistant structure |
| CN114950636A (en) * | 2022-06-06 | 2022-08-30 | 唐山迁西大方科技有限公司 | Armored nail roller sleeve and preparation method thereof |
| CN115090370A (en) * | 2022-07-04 | 2022-09-23 | 宁夏特鑫焊接热喷涂有限公司 | Roller shaft of roller press capable of welding and repairing titanium carbide stud |
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2020
- 2020-04-03 CN CN202020470917.9U patent/CN211838176U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113249851A (en) * | 2021-06-07 | 2021-08-13 | 青岛铠硕机械科技有限公司 | Water jet loom convenient to maintenance is changed thorn skin spindle nose |
| CN114939472A (en) * | 2022-05-23 | 2022-08-26 | 郑州机械研究所有限公司 | Wear-resistant structure |
| CN114950636A (en) * | 2022-06-06 | 2022-08-30 | 唐山迁西大方科技有限公司 | Armored nail roller sleeve and preparation method thereof |
| CN114950636B (en) * | 2022-06-06 | 2024-04-26 | 唐山迁西大方科技有限公司 | Armor nail roller sleeve and preparation method thereof |
| CN115090370A (en) * | 2022-07-04 | 2022-09-23 | 宁夏特鑫焊接热喷涂有限公司 | Roller shaft of roller press capable of welding and repairing titanium carbide stud |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20201103 Termination date: 20210403 |