CN111331452B - Negative pressure dust suction cavity structure special for online grinding of cathode roller - Google Patents
Negative pressure dust suction cavity structure special for online grinding of cathode roller Download PDFInfo
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- CN111331452B CN111331452B CN202010254577.0A CN202010254577A CN111331452B CN 111331452 B CN111331452 B CN 111331452B CN 202010254577 A CN202010254577 A CN 202010254577A CN 111331452 B CN111331452 B CN 111331452B
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- cathode roller
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/36—Single-purpose machines or devices
- B24B5/37—Single-purpose machines or devices for grinding rolls, e.g. barrel-shaped rolls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
- B24B55/06—Dust extraction equipment on grinding or polishing machines
Abstract
The invention discloses a negative pressure dust suction cavity structure special for online grinding of a cathode roller; belonging to the technical field of cathode roller grinding equipment; the technical key points of the device are that the device comprises a bottom plate, wherein two ends of the bottom plate are respectively provided with side plates which are parallel to each other along the vertical direction; the end face of the side plate, which is opposite to the cathode roller, is a first arc-shaped face which is adaptive to the cathode roller, and an arc-shaped plate is arranged between the two first arc-shaped faces; a first abdicating hole is arranged in the middle of the arc-shaped plate, and a grinding wheel positioned at the working position extends out of the first abdicating hole and grinds the cathode roller; a sealing end plate is arranged between the lower part of the other end surface of the side plate opposite to the first arc-shaped surface and the bottom plate, a sealing top plate is arranged at the upper ends of the two side plates, and a second abdicating hole for the rotating frame and the grinding wheel to pass through is formed among the sealing end plate, the side plates and the sealing top plate; the invention aims to provide a negative pressure dust suction cavity structure special for the online grinding of a cathode roller, which has the advantages of ingenious structure, convenient use and good effect; an on-line grinding device for a cathode roller.
Description
Technical Field
The invention relates to a special part of grinding equipment for a cathode roller, in particular to a negative pressure dust suction cavity structure special for online grinding of the cathode roller.
Background
The cathode roll is the main equipment for producing the electrolytic copper foil. After long-time use, the cathode roller has the phenomena of reduced surface conductivity, local heating of the roller surface, heating of the shaft end and the like, and the produced electrolytic copper foil has the quality problems of mottling and the like. At present, the problem of the reduction of the surface conductivity of the cathode roller is solved by adopting a manual polishing mode in advance under the condition of no serious condition, and in the serious condition, the cathode roller needs to be stopped and hoisted to special cathode roller grinding equipment for deep repair or sent to a third-party professional maintenance mechanism for maintenance. The mode of shutting down and hoisting not only has low working efficiency and seriously affects production, but also can cause direct scrapping of the cathode roller in case of collision or falling accidents in the hoisting process because the cathode roller is heavy. And adopt online grinding, what at first solve is exactly the dust removal problem, if do not have reasonable ingenious structure, can make the dust piece that grinds the production and fall into the anode slot and then influence the production of copper foil.
Disclosure of Invention
The invention aims to provide the negative pressure dust suction cavity structure special for the online grinding of the cathode roller, which has the advantages of ingenious structure, convenient use and good effect, and overcomes the defects of the prior art.
The technical scheme of the invention is realized as follows: the utility model provides a special negative pressure dust absorption cavity structure of negative pole roller online grinding, is including fixing the bottom plate on the radial slide between swivel mount and negative pole roller, bottom plate wherein both ends are provided with the curb plate that is parallel to each other respectively along vertical, and two curb plates are located the both sides of swivel mount respectively.
The end face of the side plate, which is opposite to the cathode roller, is a first arc-shaped face which is adaptive to the cathode roller, an arc-shaped plate is arranged between the two first arc-shaped faces, and the radius of a circle where the first arc-shaped face and the arc-shaped plate are located is the same as that of the cathode roller; the middle part of the arc-shaped plate is provided with a first yielding hole, and the grinding wheel positioned at the working position extends out of the first yielding hole and grinds the cathode roller.
The lower end of the first abdicating hole is fixed with a first guide positioning plate which extends obliquely towards the upper part, a chip guide film is arranged on the inclined plane of the first guide positioning plate, the free end of the chip guide film is positioned at the outer side of the outer end of the grinding wheel of the working position in a standby state, and the free end of the chip guide film is tightly attached to the cathode roller and slightly elastically deformed under the pressure action of the cathode roller in a working state.
A sealing end plate is arranged between the lower part of the other end surface of the side plate opposite to the first arc-shaped surface and the bottom plate, a sealing top plate is arranged at the upper ends of the two side plates, and a second yielding hole for the rotating frame and the grinding wheel to pass is formed among the sealing end plate, the side plates and the sealing top plate.
And a first negative pressure suction pipe which is communicated with the inner cavity and is connected with an external negative pressure dust removal system pipeline is arranged on the side wall of the negative pressure dust suction cavity below the first abdicating hole.
In the negative pressure dust suction cavity structure special for online grinding of the cathode roller, the end surface of the side plate at the upper end of the sealing end plate is a second arc-shaped surface adaptive to the edge of the rotating frame, and the inner side surface of the side plate at the side edge of the second arc-shaped surface is provided with an arc-shaped sealing rubber strip matched with the rotating frame; the upper end of the sealing end plate is provided with a first abdicating sealing rubber sheet.
One end of the sealing top plate, which is close to the rotating frame, is provided with a second guide positioning plate in a downward inclined mode, and a second abdicating sealing rubber sheet is arranged on the outer end face of the second guide positioning plate.
In the negative pressure dust collection cavity structure special for online grinding of the cathode roller, a lifting slag receiving hopper is movably arranged in the negative pressure dust collection cavity positioned on the lower side of a first negative pressure suction pipe, the bottom of the lifting slag receiving hopper is connected with a second negative pressure suction pipe in a conduction mode, and the second negative pressure suction pipe is connected with an external negative pressure dust removal system through a telescopic hose; a guide sleeve which is matched with the lifting slag receiving hopper is arranged on the bottom plate; the bottom of the lifting slag receiving hopper is connected with a lifting driving mechanism.
In the negative pressure dust suction cavity structure special for online grinding of the cathode roller, the lifting slag receiving hopper consists of a hopper part and a guide groove part which is connected to the bottom of the hopper part in a conduction manner; the second negative pressure suction pipe is communicated with the side wall of the guide groove part; the lifting driving mechanism is connected to the outer bottom of the guide groove part.
In the above negative pressure dust suction cavity structure special for online grinding of the cathode roller, the lifting driving mechanism is composed of a lifting guide plate fixed at the bottom of the lifting slag receiving hopper, a return spring connected between the lifting guide plate and the outer bottom of the bottom plate, two guide rods which are arranged on the brackets at two sides of the cathode roller respectively and have different heights, and guide notches which are arranged on two end faces of the lifting guide plate opposite to the two guide rods and are matched with the two guide rods one by one; under operating condition, the lift connects the sediment fill to tightly on the arc under reset spring's tension, and the direction of guidance of piece direction film is relative with lift connects the sediment fill, and under standby state, one of them guide bar and the cooperation of the direction breach that corresponds make lift connect the sediment fill to move down, give way the space and supply the grinding miller rotation.
In foretell negative pressure suction cavity structure special for online grinding of cathode roll, the interval is provided with two first spliced poles respectively on the face of lift guide board both sides, is provided with the second spliced pole in the outer bottom of the bottom plate that each first spliced pole corresponds, and reset spring sets up between first spliced pole and the second spliced pole that corresponds.
After the structure is adopted, the negative pressure dust suction cavity which is matched with the rotating frame for grinding and the cathode roller to be ground is formed by matching the bottom plate, the side plate, the arc plate, the sealing end plate and the sealing top plate, and a relatively closed space which can effectively absorb dust is constructed between the rotating frame and the cathode roller at the periphery of the grinding wheel through the negative pressure dust suction cavity, so that the aim of effectively absorbing the dust generated by grinding is fulfilled. In order to absorb dust to the maximum extent, especially larger-particle debris, the first guide positioning plate is skillfully arranged at the first abdicating hole, and the debris guide film is arranged on the plate in a reasonable inclined angle, so that more than 95% of dust generated by grinding can be absorbed, and more than 99.5% of debris generated by grinding can be absorbed.
Drawings
The invention will be further described in detail with reference to examples of embodiments shown in the drawings to which, however, the invention is not restricted.
FIG. 1 is a schematic cross-sectional structural view of the present invention;
FIG. 2 is a schematic perspective view of the present invention;
FIG. 3 is a schematic perspective view of another embodiment of the present invention;
FIG. 4 is a schematic view of the present invention in use;
fig. 5 is a schematic view of another aspect of the present invention.
In the figure: 1. a base plate; 1a, a guide sleeve; 2. a side plate; 2a, a first arc-shaped surface; 2b, a second arc-shaped surface; 3. an arc-shaped plate; 4. a first abdicating hole; 5. a first guide positioning plate; 6. debris is directed at the film; 7. sealing the end plate; 8. sealing the top plate; 8a, a second guide positioning plate; 9. a second abdicating hole; 10. a first negative pressure straw; 11. an arc-shaped sealing rubber strip; 12. a first abdication sealing film; 13. a second abdication sealing film; 14. lifting the slag receiving hopper; 14a, a second negative pressure suction pipe; 14b, a bucket part; 14c, a guide groove portion; 15. a lifting drive mechanism; 15a, a lifting guide plate; 15b, a return spring; 15c, a guide rod; 15d, a guide notch; 15e, a first connecting column; 15f, a second connecting column; 16. a cathode roll; 17. a rotating frame; 18. a grinding wheel; 19. an axial slide.
Detailed Description
Referring to fig. 1 to 5, the negative pressure dust suction cavity structure special for online grinding of the cathode roller comprises a bottom plate 1 fixed on a radial sliding seat between a rotating frame 17 and a cathode roller 16, wherein two ends of the bottom plate 1 are respectively provided with parallel side plates 2 along the vertical direction, and the two side plates 2 are respectively located at two sides of the rotating frame 17.
The end face of the side plate 2 opposite to the cathode roller 16 is a first arc-shaped face 2a adaptive to the cathode roller, an arc-shaped plate 3 is arranged between the two first arc-shaped faces 2a, and the radius of the circle where the first arc-shaped face 2a and the arc-shaped plate 3 are located is the same as that of the cathode roller; a first abdicating hole 4 is arranged in the middle of the arc-shaped plate 3, and a grinding wheel 18 positioned at the working position extends out of the first abdicating hole and grinds the cathode roller 16.
A first guide positioning plate 5 which extends obliquely outwards and upwards is fixed at the lower end of the first abdicating hole 4, a scrap guide film 6 is arranged on the inclined surface of the first guide positioning plate 5, the free end of the scrap guide film 6 is positioned at the outer side of the outer end of the grinding wheel of the working position in a standby state, and the free end of the scrap guide film 6 is tightly attached to the cathode roller and slightly elastically deformed under the pressure action of the cathode roller in the working state; this ensures that the debris guide film is closely attached to the cathode roll without creating a gap, thereby ensuring that the debris does not fall into the anode groove. In this embodiment, the radius of the circle in which the chip guide film is elastically deformed is 25 to 30cm, and the length of the guide film is 10 to 15 cm.
A sealing end plate 7 is arranged between the lower part of the other end face of the side plate 2 opposite to the first arc-shaped face 2a and the bottom plate 1, a sealing top plate 8 is arranged at the upper ends of the two side plates 2, and a second yielding hole 9 for the rotating frame and the grinding wheel to pass through is formed among the sealing end plate 7, the side plates 2 and the sealing top plate 8.
And a first negative pressure suction pipe 10 which is communicated with the inner cavity and is connected with an external negative pressure dust removal system pipeline is arranged on the side wall of the negative pressure dust suction cavity below the first abdicating hole 4.
Preferably, in order to ensure the sealing performance of the negative pressure dust suction cavity to the maximum extent and not influence the rotation of the grinding wheel and the rotating frame, the end surface of the side plate 2 at the upper end of the sealing end plate 7 is designed into a second arc-shaped surface 2b matched with the edge of the rotating frame, and an arc-shaped sealing rubber strip 11 matched with the rotating frame is arranged on the inner side surface of the side plate 2 at the side edge of the second arc-shaped surface 2b and can play a role in sealing without influencing the rotation of the rotating frame; the upper end of the sealing end plate 7 is provided with a first abdicating sealing film 12 which does not influence the rotation of the grinding wheel. Meanwhile, one end of the sealing top plate 8, which is close to the rotating frame, is provided with a second guiding and positioning plate 8a in a downward inclined manner, a second abdicating sealing rubber sheet 13 is arranged on the outer end face of the second guiding and positioning plate 8a, and the second abdicating sealing rubber sheet does not influence the turning-in of the grinding wheel. The arrangement of the sealing rubber sheet has the advantages that the sealing effect is realized, the inlet and outlet of the grinding wheel are not influenced, and the negative pressure dust collection effect is obviously improved because the connecting channel inside and outside the cavity is effectively reduced during negative pressure dust collection.
Furthermore, a lifting slag receiving hopper 14 is movably arranged in the negative pressure dust suction cavity at the lower side of the first negative pressure suction pipe 10, the bottom of the lifting slag receiving hopper 14 is connected with a second negative pressure suction pipe 14a in a conduction mode, and the second negative pressure suction pipe 14a is connected with an external negative pressure dust removal system pipeline through a flexible hose; a guide sleeve 1a matched with the lifting slag receiving hopper 14 is arranged on the bottom plate 1; the bottom of the lifting slag receiving hopper 14 is connected with a lifting driving mechanism 15. The lifting slag receiving hopper is used for improving the quick suction effect on large-particle fragments and avoiding the large-particle fragments from being deposited on the bottom plate 1.
When lift connects the sediment fill to be located the work position and connects the sediment, for promoting to connect the sediment effect, consequently it is nearer apart from first hole of stepping down, makes it to be located the rotation orbit of grinding miller again simultaneously like this, in order to avoid its rotation that influences grinding miller and swivel mount, consequently need connect the sediment fill with lifting and drop to design into and have raising and lowering functions.
Preferably, the lifting slag receiving hopper 14 consists of a hopper part 14b and a guide groove part 14c which is connected to the bottom of the hopper part 14b in a conduction manner; the second negative pressure suction pipe 14a is communicated with the side wall of the guide groove part 14 c; the elevation driving mechanism 15 is connected to the outer bottom of the guide groove portion 14 c. When the bucket is in the working position, the transverse outer contour of the bucket part is basically matched with the inner contour of the cavity. The guide way makes the negative pressure space reduce, and the inslot negative pressure increase is favorable to the clastic absorption of large granule.
In this embodiment, the lifting driving mechanism 15 is composed of a lifting guide plate 15a fixed at the bottom of the lifting slag receiving hopper 14, a return spring 15b connected between the lifting guide plate 15a and the outer bottom of the bottom plate 1, two guide rods 15c which are respectively arranged on the brackets at both sides of the cathode roller and have different heights, and guide notches 15d which are arranged on two end faces of the lifting guide plate 15a opposite to the two guide rods 15c and are matched with the two guide rods 15c one by one; under the working state, the lifting slag receiving hopper 14 is tightly propped against the arc-shaped plate 3 under the tension action of the return spring, the guide direction of the fragment guide film 6 is opposite to the lifting slag receiving hopper 14, and under the standby state, one guide rod 15c is matched with the corresponding guide notch 15d, so that the lifting slag receiving hopper 14 moves downwards, and a space is reserved for the grinding wheel to rotate. Through the ingenious cooperation of reset spring and arc, can make the lift connect the sediment fill to remain stable when operating condition, can not reciprocate, also need not power drive, save the cost.
When the grinding wheel needs to be replaced, the axial sliding seat 19 drives the negative pressure dust suction cavity to move to the side edge of the cathode roller 16, the guide notch is sleeved on the corresponding guide rod, the lifting slag receiving hopper can be lowered, and the grinding wheel can be replaced in a rotating mode. When the grinding device reaches the positions of the guide rods on the two sides, namely the standby position, the grinding wheel is selected and replaced when the grinding device is in standby.
Through setting up the lift and connect the sediment fill, can catch the large granule piece of whereabouts effectively, avoid its deposit in negative pressure dust absorption chamber bottom, it also can the synchronous absorption dust simultaneously. And the first negative pressure suction pipe is used for adsorbing dust and part of small particle debris.
Further preferably, in order to enable the lifting slag receiving hopper to stably lift and not to be blocked and to be stably positioned in the working position, two first connecting columns 15e are arranged on the two side plate surfaces of the lifting guide plate 15a at intervals respectively, a second connecting column 15f is arranged at the outer bottom of the bottom plate 1 corresponding to each first connecting column 15e, and a return spring 15b is arranged between each first connecting column 15e and the corresponding second connecting column 15 f. Through the tensioning of two reset springs on two sides, the two sides are stressed uniformly, the tensioning force is large, and the lifting slag receiving hopper is prevented from moving up and down.
The dust that the grinding produced gets into the negative pressure dust absorption intracavity through first hole of stepping down, and the great granule piece that the grinding produced then gets into the negative pressure dust absorption intracavity under the guide of piece direction film, and first negative pressure straw is used for adsorbing floated dust and less granule piece, and the unable absorptive large granule piece of first negative pressure straw is then connect the sediment fill to receive and is absorbed by second negative pressure straw through going up and down.
The above-mentioned embodiments are only for convenience of description, and are not intended to limit the present invention in any way, and those skilled in the art will understand that the technical features of the present invention can be modified or changed by other equivalent embodiments without departing from the scope of the present invention.
Claims (6)
1. A negative pressure dust suction cavity structure special for online grinding of a cathode roller comprises a bottom plate (1) fixed on a radial sliding seat between a rotating frame and the cathode roller, and is characterized in that two ends of the bottom plate (1) are respectively provided with parallel side plates (2) along the vertical direction, and the two side plates (2) are respectively positioned on two sides of the rotating frame;
the end face of the side plate (2) opposite to the cathode roller is a first arc-shaped face (2a) adaptive to the cathode roller, an arc-shaped plate (3) is arranged between the two first arc-shaped faces (2a), and the radius of the circle where the first arc-shaped face (2a) and the arc-shaped plate (3) are located is the same as that of the cathode roller; a first abdicating hole (4) is arranged in the middle of the arc-shaped plate (3), and a grinding wheel positioned at the working position extends out of the first abdicating hole and grinds the cathode roller;
a first guide positioning plate (5) which extends outwards and upwards in an inclined manner is fixed at the lower end of the first abdicating hole (4), a scrap guide film (6) is arranged on the inclined surface of the first guide positioning plate (5), the free end of the scrap guide film (6) is positioned at the outer side of the outer end of the grinding wheel of the working position in a standby state, and the free end of the scrap guide film (6) is tightly attached to the cathode roller and slightly elastically deformed under the pressure action of the cathode roller in the working state;
a sealing end plate (7) is arranged between the lower part of the other end surface of the side plate (2) opposite to the first arc-shaped surface (2a) and the bottom plate (1), a sealing top plate (8) is arranged at the upper ends of the two side plates (2), and a second abdicating hole (9) for the rotating frame and the grinding wheel to pass through is formed among the sealing end plate (7), the side plates (2) and the sealing top plate (8);
and a first negative pressure suction pipe (10) which is communicated with the inner cavity and is connected with an external negative pressure dust removal system pipeline is arranged on the side wall of the negative pressure dust suction cavity below the first abdicating hole (4).
2. The negative pressure dust suction cavity structure special for the online grinding of the cathode roller according to claim 1, wherein the end surface of the side plate (2) at the upper end of the sealing end plate (7) is a second arc-shaped surface (2b) adapted to the edge of the rotating frame, and an arc-shaped sealing rubber strip (11) matched with the rotating frame is arranged on the inner side surface of the side plate (2) at the side of the second arc-shaped surface (2 b); a first abdication sealing rubber sheet (12) is arranged at the upper end of the sealing end plate (7);
one end of the sealing top plate (8) close to the rotating frame is provided with a second guiding positioning plate (8a) in a downward inclined mode, and a second abdicating sealing rubber sheet (13) is arranged on the outer end face of the second guiding positioning plate (8 a).
3. The negative pressure dust suction cavity structure special for the online grinding of the cathode roller according to claim 1, wherein a lifting slag receiving hopper (14) is movably arranged in the negative pressure dust suction cavity at the lower side of the first negative pressure dust suction pipe (10), the bottom of the lifting slag receiving hopper (14) is in conduction connection with a second negative pressure dust suction pipe (14a), and the second negative pressure dust suction pipe (14a) is connected with an external negative pressure dust removal system pipeline through a flexible hose; a guide sleeve (1a) which is matched with the lifting slag receiving hopper (14) is arranged on the bottom plate (1); the bottom of the lifting slag receiving hopper (14) is connected with a lifting driving mechanism (15).
4. The negative pressure dust suction cavity structure special for the online grinding of the cathode roller as claimed in claim 3, wherein the lifting slag receiving hopper (14) is composed of a hopper part (14b) and a guide groove part (14c) which is in conduction connection with the bottom of the hopper part (14 b); the second negative pressure suction pipe (14a) is communicated with the side wall of the guide groove part (14 c); the lifting driving mechanism (15) is connected to the outer bottom of the guide groove part (14 c).
5. The negative pressure dust suction cavity structure special for the online grinding of the cathode roller according to claim 3 or 4, wherein the lifting driving mechanism (15) consists of a lifting guide plate (15a) fixed at the bottom of the lifting slag receiving hopper (14), a return spring (15b) connected between the lifting guide plate (15a) and the outer bottom of the bottom plate (1), two guide rods (15c) which are respectively arranged on the brackets at two sides of the cathode roller and have different heights, and guide notches (15d) which are arranged on two end faces of the lifting guide plate (15a) opposite to the two guide rods (15c) and are matched with the two guide rods (15c) one by one; under the working state, the lifting slag receiving hopper (14) is tightly propped against the arc-shaped plate (3) under the tension action of the reset spring, the guide direction of the scrap guide film (6) is opposite to the lifting slag receiving hopper (14), and under the standby state, one guide rod (15c) is matched with the corresponding guide notch (15d) to enable the lifting slag receiving hopper (14) to move downwards to make room for the grinding wheel to rotate.
6. The negative pressure dust suction cavity structure special for the online grinding of the cathode roller as claimed in claim 5, wherein two first connecting columns (15e) are respectively arranged on the two side plate surfaces of the lifting guide plate (15a) at intervals, a second connecting column (15f) is arranged at the outer bottom of the bottom plate (1) corresponding to each first connecting column (15e), and the return spring (15b) is arranged between the first connecting column (15e) and the corresponding second connecting column (15 f).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010254577.0A CN111331452B (en) | 2020-04-02 | 2020-04-02 | Negative pressure dust suction cavity structure special for online grinding of cathode roller |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010254577.0A CN111331452B (en) | 2020-04-02 | 2020-04-02 | Negative pressure dust suction cavity structure special for online grinding of cathode roller |
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| CN111331452A CN111331452A (en) | 2020-06-26 |
| CN111331452B true CN111331452B (en) | 2020-11-03 |
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| CN206780073U (en) * | 2017-06-13 | 2017-12-22 | 广东嘉元科技股份有限公司 | A kind of cathode roll milling apparatus |
| CN210173141U (en) * | 2019-06-17 | 2020-03-24 | 昆明烟机集团二机有限公司 | Tobacco cutter grinding wheel device |
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| JP2001198789A (en) * | 2000-01-21 | 2001-07-24 | Sumitomo Heavy Ind Ltd | Device for cleaning and polishing roll surface |
| CN1769048A (en) * | 2004-08-28 | 2006-05-10 | 曼.罗兰.德鲁克马辛伦公司 | Apparatus and method for removing imaging of forme |
| CN201442200U (en) * | 2009-08-20 | 2010-04-28 | 徐宪良 | Roller grinder |
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|---|---|
| CN111331452A (en) | 2020-06-26 |
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