CN216574976U - Straightening device of round steel peeling machine - Google Patents
Straightening device of round steel peeling machine Download PDFInfo
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- CN216574976U CN216574976U CN202122961159.8U CN202122961159U CN216574976U CN 216574976 U CN216574976 U CN 216574976U CN 202122961159 U CN202122961159 U CN 202122961159U CN 216574976 U CN216574976 U CN 216574976U
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Abstract
The utility model provides a straightening device of a round steel peeling machine, which comprises a rack, wherein the rack is provided with a vertical straightening mechanism and a longitudinal straightening mechanism, the vertical straightening mechanism comprises vertical fixed pressing wheels which are arranged at intervals along a feeding direction, and vertical movable pressing wheels which are arranged at intervals, staggered with the vertical fixed pressing wheels in the feeding direction and arranged in a liftable manner; indulge mechanism of rectifying includes along the vertical constant pressure wheel of feeding direction interval arrangement to and interval arrangement each other, stagger in the feeding direction with indulging the constant pressure wheel, and be the vertical moving pinch roller of liftable setting, its characterized in that: the vertical fixed pinch roller, the vertical movable pinch roller, the vertical fixed pinch roller and the vertical movable pinch roller respectively comprise a first half wheel, a second half wheel and a straightening ring clamped between the first half wheel and the second half wheel, the outer wall of the straightening ring is recessed to form a straightening joint surface, and bearings used for being matched with the central shaft are arranged at the centers of the first half wheel and the second half wheel. The utility model has the advantages of long service life and convenient replacement and maintenance.
Description
Technical Field
The utility model relates to the field of straightening devices at the upstream of a feeding end of a peeling machine, in particular to a round steel peeling machine straightening device.
Background
The steel peeling machine is used for removing an oxide layer on the surface of steel, the flow of the whole assembly line comprises the steps of straightening, pushing, peeling, pulling and the like, wherein in the straightening link, the steel (coiled wire) needs to be straightened, so that the steel is conveniently rolled by a roller of the pushing mechanism and conveyed forwards, the roller of the pushing mechanism is usually of a counter-rolling type, and therefore, the straightening function is not provided, and the straightening process is arranged at the upstream of the pushing link;
the existing straightening device generally comprises a vertical straightening mechanism and a longitudinal straightening mechanism, a pressing wheel used for straightening is often integrated, the pressing wheel is easy to wear after long-term use, if the pressing wheel is directly made of alloy steel with high price, the material cost can be increased, meanwhile, the whole pressing wheel can be directly replaced after being worn, and for the pressing wheel, the real working surface of the pressing wheel only exists on the outer wall in extrusion contact with steel (coiled wire), so that the wear resistance of the part is improved, and the service life of the pressing wheel is prolonged.
SUMMERY OF THE UTILITY MODEL
Based on the problems, the utility model aims to provide the round steel peeling machine straightening device which is long in service life and convenient to replace and maintain.
Aiming at the problems, the following technical scheme is provided: a straightening device of a round steel peeling machine comprises a rack, wherein a vertical straightening mechanism and a longitudinal straightening mechanism which are arranged adjacently are arranged on the rack, and the vertical straightening mechanism comprises vertical fixed pressing wheels which are arranged at intervals along a feeding direction and vertical movable pressing wheels which are arranged at intervals, staggered with the vertical fixed pressing wheels in the feeding direction and arranged in a lifting manner; the vertical straightening mechanism comprises vertical constant pressure wheels which are arranged at intervals along the feeding direction, vertical movable pinch wheels which are arranged at intervals and staggered with the vertical constant pressure wheels in the feeding direction and can be lifted, the vertical fixed pinch wheels, the vertical movable pinch wheels, the vertical fixed pinch wheels and the vertical movable pinch wheels respectively comprise first half wheels and second half wheels which are symmetrically arranged, and straightening rings clamped between the first half wheels and the second half wheels, the outer annular walls of the straightening rings are recessed to form straightening joint surfaces, and bearings used for being matched with the central shaft are arranged at the centers of the first half wheels and the second half wheels.
In the structure, the vertical fixed pinch roller, the vertical moving pinch roller, the longitudinal fixed pinch roller and the longitudinal moving pinch roller are fixed by the first half wheel and the second half wheel in a buckling mode, so that the straightening rings are independently replaced, and the cost of the vertical fixed pinch roller, the vertical moving pinch roller, the longitudinal fixed pinch roller and the longitudinal moving pinch roller is effectively reduced.
The utility model is further provided that one surface of the first half wheel facing the second half wheel is provided with a first cone frustum with a cone tip facing the second half wheel, and the major diameter of the first cone frustum is smaller than the diameter of the first half wheel; one surface of the second half wheel facing the first half wheel is provided with a second cone frustum with a cone tip facing the first half wheel, and the major diameter of the second cone frustum is smaller than the diameter of the second half wheel; and the junctions of the two end surfaces of the straightening ring and the inner ring wall are respectively provided with centering conical surfaces, the conical tips of the centering conical surfaces face each other, and the two centering conical surfaces are respectively matched with the first cone table and the second cone table.
In the structure, the straightening ring is matched with the first cone platform and the second cone platform through two centering conical surfaces, the concentricity between the straightening ring and the first half wheel and between the straightening ring and the second half wheel is effectively guaranteed, the centering conical surfaces are simultaneously utilized to realize tight fit with the first cone platform and the second cone platform, and the connection reliability is guaranteed.
The straightening ring is characterized in that the first half wheel is provided with through holes which penetrate through the first half wheel and the first cone platform and are arranged at intervals along the circumferential direction of the first half wheel, the second half wheel is provided with screw holes which penetrate through the second half wheel and the second cone platform and are arranged at intervals along the circumferential direction of the second half wheel, and the first half wheel realizes the fixation of the straightening ring through bolts which penetrate through the through holes and are screwed with the screw holes of the second half wheel.
In the structure, the first half wheel and the second half wheel are fastened through the bolt pair lock, and the straightening ring is convenient to detach and replace.
The utility model is further provided that a counter bore is arranged at one end of the through hole, which is back to the first vertebral platform, and the screw head of the bolt is positioned in the counter bore.
In the structure, the counter bore can be used for accommodating the screw head of the bolt, so that the overall appearance of the vertical fixed pressing wheel, the vertical moving pressing wheel, the longitudinal fixed pressing wheel and the longitudinal moving pressing wheel is cleaner and tidier, and the exposed screw head is prevented from being scraped with other objects.
The utility model is further arranged that the straightening junction surface is provided with a plurality of friction grains which are arranged at intervals along the circumferential direction of the straightening ring.
In the structure, the friction grains can generate good friction with the vertical fixed pressing wheel, the vertical moving pressing wheel, the longitudinal fixed pressing wheel and the longitudinal moving pressing wheel when steel (coiled wire) is fed, so that the vertical fixed pressing wheel, the vertical moving pressing wheel, the longitudinal fixed pressing wheel and the longitudinal moving pressing wheel are forced to rotate to straighten the steel (coiled wire), and scraping is avoided.
The utility model is further provided that the straightening ring is made of hard alloy or brass.
In the structure, the soft metal can be made of brass, and the self-lubricating property is utilized to improve the feeding efficiency and reduce the straightening resistance; for metal, such as ordinary steel, choose the straightening ring of carbide material for use, guarantee its wearability, also reduce simultaneously and decide pinch roller, the pinch roller that hangs down, indulge the cost when deciding pinch roller and indulge the whole cemented carbide that adopts of dynamic pressure wheel and make, also effectively solved through the welded mode installation straightening ring lead to being difficult to dismantle alone the condition emergence of changing the straightening ring.
The utility model is further provided that the central shaft is connected with the sliding blocks on the corresponding vertical straightening mechanism and the longitudinal straightening mechanism; the vertical straightening mechanism and the longitudinal straightening mechanism are both provided with sliding chutes matched with the sliding blocks to slide.
In the structure, the sliding block is matched with the sliding chutes of the vertical straightening mechanism and the longitudinal straightening mechanism and used for adjusting the gaps between the vertical fixed pressing wheel and the vertical moving pressing wheel and between the longitudinal fixed pressing wheel and the longitudinal moving pressing wheel so as to control the straightening effect.
The utility model is further arranged in that the sliding blocks connected with the central shafts of the vertical dynamic pressure wheel and the longitudinal dynamic pressure wheel are driven to lift through the air cylinder.
In the structure, the cylinder is an optimal power source, and the effects of fast pressing and yielding protection in overload can be realized.
The utility model is further provided that the surface of the slide block of the vertical fixed pinch roller, which is back to the vertical moving pinch roller, and the surface of the slide block of the longitudinal fixed pinch roller, which is back to the longitudinal moving pinch roller, are provided with fine adjustment screw rods which are abutted against the slide block and are used for adjusting the fixed position of the vertical fixed pinch roller and the fixed position of the longitudinal fixed pinch roller.
In the structure, the fine adjustment screw rod controls the reference heights of the vertical fixed pressing wheel and the vertical fixed pressing wheel through fine adjustment, so that the vertical fixed pressing wheel and the vertical pressing wheel, and the steel (coiled wire) corrected by the vertical fixed pressing wheel and the vertical fixed pressing wheel are coaxial with the pushing direction of downstream pushing equipment.
The utility model has the beneficial effects that: the vertical fixed pressing wheel, the vertical movable pressing wheel, the longitudinal fixed pressing wheel and the longitudinal movable pressing wheel are fixed with the straightening rings through the first half wheel and the second half wheel in a buckling mode, so that the straightening rings are independently replaced, and the cost of the vertical fixed pressing wheel, the vertical movable pressing wheel, the longitudinal fixed pressing wheel and the longitudinal movable pressing wheel is effectively reduced; the straightening ring is matched with the first cone platform and the second cone platform through two centering conical surfaces, concentricity between the straightening ring and the first half wheel and concentricity between the straightening ring and the second half wheel are effectively guaranteed, tight fit is achieved through the centering conical surfaces, the first cone platform and the second cone platform, and connection reliability is guaranteed.
Drawings
Fig. 1 is a schematic perspective view of a first perspective structure according to the present invention.
Fig. 2 is a perspective view of a second perspective structure according to the present invention.
Fig. 3 is a left side view of the present invention.
Fig. 4 is a right side view of the present invention.
FIG. 5 is a schematic diagram of the puck structure of the present invention.
FIG. 6 is a schematic view of a full-section of the pressing wheel of the present invention.
Figure 7 is a schematic diagram of an exploded structure of the puck of the present invention.
FIG. 8 is a schematic diagram of the full-section structure of the explosion of the pressing wheel of the present invention.
The reference numbers in the figures mean: 10-a frame; 11-a plumbing mechanism; 111-vertical pinch roller; 112-vertical moving pinch roller; 12-a longitudinal straightening mechanism; 121-longitudinal fixed pinch roller; 122-longitudinal moving pinch roller; 13-first half-wheel; 131-the first vertebral platform; 132-a via; 1321-counterbore; 14-a second half-wheel; 141-second vertebral table; 142-screw holes; 15-straightening rings; 151-straightening of the dough; 1511-rub line; 152-centering cone; 16-a central axis; 161-a slider; 162-a chute; 17-a bearing; 18-bolt; 181-screw head; 19-a cylinder; 20-fine adjustment of the screw.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the utility model but are not intended to limit the scope of the utility model.
Referring to fig. 1 to 8, the round steel peeling machine straightening device shown in fig. 1 to 8 comprises a frame 10, wherein the frame 10 is provided with a vertical straightening mechanism 11 and a longitudinal straightening mechanism 12 which are adjacently arranged, the vertical straightening mechanism 11 comprises vertical constant pressure wheels 111 which are arranged at intervals along a feeding direction, and vertical constant pressure wheels 112 which are arranged at intervals, staggered or overlapped with the vertical constant pressure wheels 111 in the feeding direction and arranged in a lifting manner; the longitudinal straightening mechanism 12 comprises longitudinal constant pressure wheels 121 arranged at intervals along the feeding direction, and longitudinal movable pressure wheels 122 arranged at intervals, staggered with the longitudinal constant pressure wheels 121 in the feeding direction and capable of being lifted, the vertical fixed pressure wheels 111, the vertical movable pressure wheels 112, the longitudinal fixed pressure wheels 121 and the longitudinal movable pressure wheels 122 respectively comprise first half wheels 13 and second half wheels 14 arranged symmetrically, and straightening rings 15 clamped between the first half wheels 13 and the second half wheels 14, outer annular walls of the straightening rings 15 are recessed to form straightening joint surfaces 151, and bearings 17 matched with the central shaft 16 are arranged at the centers of the first half wheels 13 and the second half wheels 14.
In the structure, the vertical fixed pinch roller 111, the vertical dynamic pressure roller 112, the vertical fixed pinch roller 121 and the vertical dynamic pressure roller 122 are fixed on the straightening ring 15 through the first half wheel 13 and the second half wheel 14 in a buckling mode, so that the straightening ring 15 is independently replaced, and the cost of the vertical fixed pinch roller 111, the vertical dynamic pressure roller 112, the vertical fixed pinch roller 121 and the vertical dynamic pressure roller 122 is effectively reduced.
In this embodiment, a first cone 131 with a cone tip facing the second half wheel 14 is disposed on a surface of the first half wheel 13 facing the second half wheel 14, and the diameter of the first cone 131 is smaller than that of the first half wheel 13; one surface of the second half wheel 14 facing the first half wheel 13 is provided with a second cone frustum 141 with a cone tip facing the first half wheel 13, and the diameter of the second cone frustum 141 is smaller than that of the second half wheel 14; the junctions of the two end surfaces of the straightening ring 15 and the inner annular wall are respectively provided with a centering conical surface 152, the conical tips of the centering conical surfaces 152 face each other, and the two centering conical surfaces 152 are respectively matched with the first cone table 131 and the second cone table 141.
In the above structure, the straightening ring 15 is adapted to the first vertebral platform 131 and the second vertebral platform 141 through the two centering conical surfaces 152, so that the concentricity between the straightening ring 15 and the first half wheel 13 and the second half wheel 14 is effectively ensured, and the centering conical surfaces 152 are utilized to realize tight fit with the first vertebral platform 131 and the second vertebral platform 141, so that the connection reliability is ensured.
In this embodiment, the first half wheel 13 is provided with through holes 132 penetrating through the first half wheel 13 and the first cone 131 and arranged at intervals along the circumferential direction of the first half wheel 13, the second half wheel 14 is provided with screw holes 142 penetrating through the second half wheel 14 and the second cone 141 and arranged at intervals along the circumferential direction of the second half wheel 14, and the first half wheel 13 fixes the straightening ring 15 by bolts 18 passing through the through holes 132 and screwed with the screw holes 142 of the second half wheel 14.
In the structure, the first half wheel 13 and the second half wheel 14 are fastened through the bolts 18, so that the straightening ring 15 is convenient to detach and replace.
In this embodiment, a counter bore 1321 is provided at an end of the through hole 132 facing away from the first cone 131, and the screw head 181 of the bolt 18 is located in the counter bore 1321.
In the above structure, the counterbore 1321 can be used for accommodating the screw head 181 of the bolt 18, so that the overall appearance of the vertical fixed pressing wheel 111, the vertical pressing wheel 112, the longitudinal fixed pressing wheel 121 and the longitudinal movable pressing wheel 122 is cleaner and tidier, and the exposed screw head 181 is prevented from being scraped by other objects.
In this embodiment, the straightening engagement surface 151 is provided with a plurality of friction lines 1511 arranged at intervals along the circumferential direction of the straightening ring 15.
In the above structure, the friction lines 1511 can generate good friction with the vertical fixed pressure wheel 111, the vertical pressure wheel 112, the vertical fixed pressure wheel 121 and the vertical pressure wheel 122 when steel (coiled wire) is fed, so as to force the vertical fixed pressure wheel 111, the vertical pressure wheel 112, the vertical fixed pressure wheel 121 and the vertical pressure wheel 122 to rotate to straighten the steel (coiled wire), thereby avoiding scraping, and the friction lines 1511 can be concave or convex lines.
In this embodiment, the straightening ring 15 is made of cemented carbide or brass.
In the structure, the soft metal can be made of brass, and the self-lubricating property is utilized to improve the feeding efficiency and reduce the straightening resistance; for metal, such as common steel, the straightening ring 15 made of hard alloy is selected, so that the wear resistance of the straightening ring is ensured, the cost of the whole vertical fixed pressing wheel 111, the vertical pressing wheel 112, the vertical fixed pressing wheel 121 and the vertical movable pressing wheel 122 made of hard alloy is reduced, and the problem that the straightening ring 15 is difficult to be detached and replaced independently due to the fact that the straightening ring 15 is installed in a welding mode is solved.
In this embodiment, the central shaft 16 is connected to the corresponding slide block 161 on the vertical straightening mechanism 11 and the longitudinal straightening mechanism 12; the vertical straightening mechanism 11 and the longitudinal straightening mechanism 12 are both provided with a sliding groove 162 adapted to slide with the sliding block 161.
In the above structure, the sliding block 161 is adapted to the sliding groove 162 of the vertical straightening mechanism 11 and the longitudinal straightening mechanism 12, and is used for adjusting the gap between the vertical pressure-fixing wheel 111 and the vertical pressure-fixing wheel 112, and the gap between the longitudinal pressure-fixing wheel 121 and the longitudinal pressure-fixing wheel 122, so as to control the straightening effect.
In this embodiment, the sliders 161 connected to the central shafts 16 of the vertical moving pinch rollers 112 and the vertical moving pinch rollers 122 are driven to move up and down by the air cylinders 19.
In the above structure, the cylinder 19 is a preferable power source, and effects such as fast pressing and yielding protection in overload can be realized.
In this embodiment, the surface of the slider 161 of the vertical fixed pressure wheel 111, which faces away from the vertical movable pressure wheel 112, and the surface of the slider 161 of the longitudinal fixed pressure wheel 121, which faces away from the longitudinal movable pressure wheel 122, are provided with fine adjustment screws 20, which abut against the slider 161 and are used for adjusting the fixing positions of the vertical fixed pressure wheel 111 and the longitudinal fixed pressure wheel 121.
In the above structure, the fine adjustment screw 20 controls the reference heights of the vertical constant pressure wheel 111 and the vertical constant pressure wheel 121 through fine adjustment, so that the vertical constant pressure wheel 111 and the vertical constant pressure wheel 112, and the steel material (coiled wire material) corrected by the vertical constant pressure wheel 121 and the vertical constant pressure wheel 122 are kept coaxial with the material pushing direction of the downstream material pushing device.
The utility model has the beneficial effects that: the vertical fixed pinch roller 111, the vertical dynamic pinch roller 112, the vertical fixed pinch roller 121 and the vertical dynamic pinch roller 122 are fixed on the straightening ring 15 through the first half wheel 13 and the second half wheel 14 in a buckling mode, so that the straightening ring 15 is independently replaced, and the cost of the vertical fixed pinch roller 111, the vertical dynamic pinch roller 112, the vertical fixed pinch roller 121 and the vertical dynamic pinch roller 122 is effectively reduced; the straightening ring 15 is matched with the first vertebral platform 131 and the second vertebral platform 141 through two centering conical surfaces 152, the concentricity between the straightening ring 15 and the first half wheel 13 and the second half wheel 14 is effectively guaranteed, meanwhile, the centering conical surfaces 152 are utilized to realize tight fit with the first vertebral platform 131 and the second vertebral platform 141, and the connection reliability is guaranteed.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and those modifications and variations assumed in the above are also considered to be within the protective scope of the present invention.
Claims (9)
1. A straightening device of a round steel peeling machine comprises a rack, wherein a vertical straightening mechanism and a longitudinal straightening mechanism which are arranged adjacently are arranged on the rack, and the vertical straightening mechanism comprises vertical fixed pressing wheels which are arranged at intervals along a feeding direction and vertical movable pressing wheels which are arranged at intervals, staggered with the vertical fixed pressing wheels in the feeding direction and arranged in a lifting manner; indulge mechanism of rectifying includes along the vertical constant pressure wheel of feeding direction interval arrangement to and interval arrangement each other, stagger in the feeding direction with indulging the constant pressure wheel, and be the vertical moving pinch roller of liftable setting, its characterized in that: the vertical fixed pinch roller, the vertical movable pinch roller, the vertical fixed pinch roller and the vertical movable pinch roller respectively comprise a first half wheel, a second half wheel and a straightening ring clamped between the first half wheel and the second half wheel, the outer wall of the straightening ring is recessed to form a straightening joint surface, and bearings used for being matched with the central shaft are arranged at the centers of the first half wheel and the second half wheel.
2. The round steel peeling machine straightening device according to claim 1, characterized in that: one surface of the first half wheel facing the second half wheel is provided with a first cone frustum with a cone tip facing the second half wheel, and the major diameter of the first cone frustum is smaller than the diameter of the first half wheel; one surface of the second half wheel facing the first half wheel is provided with a second cone frustum with a cone tip facing the first half wheel, and the major diameter of the second cone frustum is smaller than the diameter of the second half wheel; and the junctions of the two end surfaces of the straightening ring and the inner ring wall are respectively provided with centering conical surfaces, the conical tips of the centering conical surfaces face each other, and the two centering conical surfaces are respectively matched with the first cone table and the second cone table.
3. The round steel peeling machine straightening device according to claim 2, characterized in that: first half wheel is equipped with and runs through first half wheel and first vertebra platform setting to along the through-hole of first half wheel circumferential direction interval arrangement, second half wheel is equipped with and runs through second half wheel and second vertebra platform setting to along the screw hole of second half wheel circumferential direction interval arrangement, first half wheel is through passing the bolt realization that the screw hole of through-hole and second half wheel closed soon fixed to the straightening ring.
4. The round steel peeling machine straightening device according to claim 3, characterized in that: one end of the through hole, which faces away from the first vertebral platform, is provided with a counter bore, and the screw head of the bolt is positioned in the counter bore.
5. The round steel peeling machine straightening device according to claim 1, characterized in that: the straightening tangent joint surface is provided with a plurality of friction grains which are arranged at intervals along the circumferential direction of the straightening ring.
6. The round steel peeling machine straightening device according to claim 1 or 5, which is characterized in that: the straightening ring is made of hard alloy or brass.
7. The round steel peeling machine straightening device according to claim 1, characterized in that: the central shaft is connected with the sliding blocks on the corresponding vertical straightening mechanism and the longitudinal straightening mechanism; the vertical straightening mechanism and the longitudinal straightening mechanism are both provided with sliding chutes matched with the sliding blocks to slide.
8. The round steel peeling machine straightening device according to claim 7, characterized in that: and the sliding blocks connected with the central shafts of the vertical dynamic pressure wheel and the longitudinal dynamic pressure wheel are driven to lift through the air cylinder.
9. The round steel peeling machine straightening device according to claim 7, characterized in that: the surface of the sliding block of the vertical fixed pressing wheel back to the vertical moving pressing wheel and the surface of the sliding block of the longitudinal fixed pressing wheel back to the longitudinal moving pressing wheel are provided with fine adjustment screw rods which are abutted against the sliding blocks and used for adjusting the fixed position of the vertical fixed pressing wheel and the fixed position of the longitudinal fixed pressing wheel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122961159.8U CN216574976U (en) | 2021-11-27 | 2021-11-27 | Straightening device of round steel peeling machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122961159.8U CN216574976U (en) | 2021-11-27 | 2021-11-27 | Straightening device of round steel peeling machine |
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| Publication Number | Publication Date |
|---|---|
| CN216574976U true CN216574976U (en) | 2022-05-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122961159.8U Active CN216574976U (en) | 2021-11-27 | 2021-11-27 | Straightening device of round steel peeling machine |
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| Country | Link |
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| CN (1) | CN216574976U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115464514A (en) * | 2022-10-18 | 2022-12-13 | 安徽金寨将军磁业有限公司 | Combined feeding wheel of permanent magnetic ferrite magnetic shoe grinding machine |
-
2021
- 2021-11-27 CN CN202122961159.8U patent/CN216574976U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115464514A (en) * | 2022-10-18 | 2022-12-13 | 安徽金寨将军磁业有限公司 | Combined feeding wheel of permanent magnetic ferrite magnetic shoe grinding machine |
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