CN110587477A - Automatic grinding and cleaning equipment - Google Patents
Automatic grinding and cleaning equipment Download PDFInfo
- Publication number
- CN110587477A CN110587477A CN201911023274.1A CN201911023274A CN110587477A CN 110587477 A CN110587477 A CN 110587477A CN 201911023274 A CN201911023274 A CN 201911023274A CN 110587477 A CN110587477 A CN 110587477A
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- CN
- China
- Prior art keywords
- grinding head
- workpiece
- special
- grinding
- shaped
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/04—Headstocks; Working-spindles; Features relating thereto
-
- 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
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
-
- 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
-
- 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
- B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
- B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
- B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
- B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
Abstract
The invention relates to automatic grinding cleaning equipment which is used for cleaning the surface of a workpiece and comprises a driving piece, a special-shaped grinding head, non-woven fabric and an object stage, wherein the driving piece is connected with one end of the special-shaped grinding head and is used for driving the special-shaped grinding head to do lifting and rotating motion; the special-shaped grinding head comprises more than two elastic grinding head salient points, and the grinding head salient points can cover and clean the whole surface to be cleaned of the workpiece when rotating; the non-woven fabric is coated at the other end of the special-shaped grinding head, which is far away from the driving piece, and is used for cleaning the surface to be cleaned of the workpiece; the object stage is used for bearing and fixing the workpiece. According to the automatic grinding and cleaning equipment, the special-shaped grinding head can be pressed down to realize surface contact with the surface of the workpiece, and when the special-shaped grinding head rotates under the action of the driving piece, the surface of the workpiece can be cleaned in a rotating grinding mode, so that the cleaning effect is good, the cleaning efficiency is high, and a large amount of manpower can be replaced.
Description
Technical Field
The invention relates to the technical field of cleaning equipment, in particular to automatic grinding and cleaning equipment.
Background
At present, glass cover plates, liquid crystal glass and the like in the electronic industry need to be cleaned manually by using non-woven fabrics or a scraping type cleaning mode before being attached, the cleaning rate is poor, a large amount of labor is needed, and stubborn stains, 2.5D areas or corner areas of workpieces still need to be cleaned manually or by using a cotton swab.
Disclosure of Invention
Therefore, it is necessary to provide an automatic polishing and cleaning apparatus for the problem that the glass cover plate, the liquid crystal glass, etc. in the conventional electronic industry need to be cleaned manually before being attached.
The automatic grinding and cleaning equipment is used for cleaning the surface of a workpiece and comprises a driving piece, a special-shaped grinding head, non-woven fabric and an object stage, wherein the driving piece is connected with one end of the special-shaped grinding head and is used for driving the special-shaped grinding head to do lifting and rotating motion; the special-shaped grinding head comprises more than two elastic grinding head salient points, and the grinding head salient points can cover and clean the whole surface to be cleaned of the workpiece when rotating; the non-woven fabric is coated at the other end of the special-shaped grinding head, which is far away from the driving piece, and is used for cleaning the surface to be cleaned of the workpiece; the object stage is used for bearing and fixing the workpiece.
In one embodiment, the special-shaped grinding head is of a cotton swab integrated salient point type, and each cotton swab corresponds to one grinding head salient point.
In one embodiment, the grinding head salient points comprise fixedly connected cylindrical bodies and arc-shaped bodies protruding outwards towards the surface of the workpiece, the grinding head salient points are in an overpressure state when being lowered to be in contact with the surface of the workpiece and can be elastically deformed, and the arc-shaped bodies can be flattened, so that the grinding head salient points can be in surface contact with the surface of the workpiece when rotating.
In one embodiment, the special-shaped grinding head device further comprises a control system connected with the driving piece and used for controlling the descending distance of the special-shaped grinding head.
In one embodiment, the grinding head salient points are arranged in a staggered mode in a dot matrix mode, and the cleaning ranges of the adjacent grinding head salient points are overlapped in a staggered mode.
In one embodiment, the grinding device further comprises a torque motor for applying force to the non-woven fabric, so that the non-woven fabric can be coated on the special-shaped grinding head all the time.
In one embodiment, the object stage can drive the workpiece to make linear translation motion, so that the special-shaped grinding head can clean the whole surface to be cleaned of the workpiece.
In one embodiment, the special-shaped grinding head comprises grinding head salient points with different lengths, and the end surface, close to the surface of the workpiece, of the special-shaped grinding head is in a cambered surface and is used for being matched with the surface to be cleaned of the workpiece.
In one embodiment, the profiled grinding heads can cover and clean the 2.5D surface of the workpiece, the profiled grinding heads comprise a central region and an edge region, the length of the grinding head salient points in the central region is equal, and the length of the grinding head salient points in the edge region is gradually increased towards the direction far away from the central region and is used for matching with the 2.5D surface of the workpiece.
In one embodiment, the grinding head device further comprises a connecting assembly, wherein the connecting assembly is arranged between the driving piece and the special-shaped grinding head, and the connecting assembly can be lifted and rotated under the action of the driving piece so as to drive the special-shaped grinding head to lift and rotate.
The automatic grinding and cleaning equipment has the beneficial effects that:
according to the automatic grinding and cleaning equipment, the structure of the special-shaped grinding head and the connection relation between the special-shaped grinding head and the driving piece, the non-woven fabric and the objective table are reasonably arranged, the elasticity of the salient points of the grinding head is utilized, the special-shaped grinding head can be pressed down to be in surface contact with the surface of a workpiece under the action of the driving piece, when the special-shaped grinding head rotates under the action of the driving piece, the surface of the workpiece can be cleaned in a rotating grinding mode, the cleaning effect is good, the cleaning efficiency is high, and a large amount of manpower can be replaced.
Drawings
FIG. 1 is a schematic view of the overall structure of an automatic polishing and cleaning apparatus according to an embodiment.
Figure 2 is a longitudinal cross-sectional view of a profile grinding head in one embodiment.
Figure 3 is a transverse cross-sectional view of a profile grinding head in one embodiment.
Figure 4 is a longitudinal cross-sectional view of another embodiment of a profile grinding head.
Reference numerals:
the grinding head; non-woven fabric 400, stage 500, workpiece 600, stubborn stains 700.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "inner", "outer", "left", "right" and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
The automatic grinding and cleaning equipment is used for cleaning the surfaces of workpieces 600 such as glass cover plates, liquid crystal glass and the like in the electronic industry, and in one embodiment, as shown in fig. 1, the automatic grinding and cleaning equipment comprises a driving piece 100, a connecting assembly 200, a special-shaped grinding head 300, non-woven fabric 400 and an object stage 500, wherein the connecting assembly 200 is arranged between the driving piece 100 and the special-shaped grinding head 300, the connecting assembly 200 can perform lifting and rotating motions under the action of the driving piece 100, and further drives the special-shaped grinding head 300 to perform lifting and rotating motions, as shown in fig. 2, the special-shaped grinding head 300 comprises more than two grinding head salient points 310 with elasticity, and the grinding head salient points 310 can cover and clean the whole surface to be cleaned of the workpiece; the non-woven fabric 400 is coated at the other end of the special-shaped grinding head 300 far away from the driving piece 100 and is used for performing contact type friction cleaning on the surface to be cleaned of the workpiece 600; the stage 500 is used to carry and hold a workpiece 600 to be cleaned. It is understood that in other embodiments, the automatic abrasive cleaning device may not be provided with the connecting assembly 200, the shaped abrasive tip 300 may be directly connected to the output shaft of the driving member 100, and the driving member 100 can directly drive the shaped abrasive tip 300 to perform the lifting and rotating motion.
In one embodiment, the driving member 100 is a servo motor, the servo motor drives the connecting assembly 200 and the special-shaped grinding head 300 to rotate, so as to perform rotary grinding type cleaning on the workpiece 600, and the special-shaped grinding head 300 is in a "cotton stick integrated" bump type, which is similar to an integrated body of numerous "cotton sticks", so that the cleaning efficiency can be improved, and a large amount of manpower can be replaced. Wherein, one "cotton swab" is a grinding head bump 310, as shown in fig. 2 and fig. 3, the grinding head bumps 310 are arranged in a dot matrix, and the grinding head bumps 310 in each row are arranged in a staggered manner, the grinding head bumps 310 include a cylindrical body 311 fixedly connected and an arc body 312 protruding outward toward the surface of the workpiece 600, the grinding head bumps 310 are in an overpressure state when being lowered to be in contact with the surface of the workpiece 600, and can be elastically deformed, and the arc body 312 can be flattened, so that the grinding head bumps 310 are similar to a cylinder, when the special-shaped grinding head 300 performs a rotational motion under the action of the driving member 100, the grinding head bumps 310 perform a circular motion around the rotation axis of the special-shaped grinding head 300, the cleaning range of each grinding head bump 310 is a circular ring, and due to the staggered arrangement of the dot matrix of the grinding head bumps 310, the cleaning ranges of adjacent grinding head bumps 310 are overlapped in a staggered, the grinding head protrusions 310 can achieve full surface contact with the surface of the workpiece 600 without dead angles, so that the shaped grinding head 300 does not have cleaning dead angles when cleaning the surface of the workpiece 600.
In addition, as shown in fig. 2, the workpiece 600 is horizontally placed, stubborn stains 700 exist on the surface of the workpiece 600 between the adjacent first grinding head peaks 313 and the second grinding head peaks 314, and when the profiled grinding heads 300 make a rotational motion under the action of the drive 100, as shown in fig. 3, the third grinding head peaks 315 or the fourth grinding head peaks 316 which are alternately distributed between the first grinding head peaks 313 and the second grinding head peaks 314 will exert a horizontal pushing force on the stubborn stains 700, so that the stubborn stains 700 are removed from the surface of the workpiece 600.
In one embodiment, the automatic abrasive cleaning apparatus further comprises a control system connected to the drive member 100 for controlling the lowering distance of the profile grinding heads 300. Wherein a critical value is prestored in the control system, when the descending distance of the special-shaped grinding head 300 is equal to the critical value, the arc-shaped bodies 312 of the grinding head salient points 310 are just flattened, and the grinding head salient points 310 can realize surface contact with the surface of the workpiece 600. In the working process of the automatic grinding and cleaning device, the control system only needs to control the descending distance of the special-shaped grinding head 300 to be larger than the critical value. It is understood that in other embodiments, two threshold values, namely a first threshold value and a second threshold value, may be prestored in the control system, and when the descending distance of the shaped grinding head 300 is equal to the first threshold value, the arc-shaped bodies 312 of the grinding head salient points 310 are just flattened, and the grinding head salient points 310 can realize surface contact with the surface of the workpiece 600; when the lowering distance of the shaped grinding stone 300 is equal to the second critical value, the columns 311 of the grinding stone bumps 310 are pressed to be deformed, in which case the control system needs to control the lowering distance of the shaped grinding stone 300 to be between the first critical value and the second critical value.
In one specific embodiment, the grinding head protrusions 310 are made of a rubber material, specifically, a hydrogenated nitrile butadiene rubber HNBR material, have a smooth surface and certain elasticity, and when the shaped grinding head 300 is pressed down and performs a rotational motion, the non-woven fabric 400 can be driven to perform a rotational motion together, so that the surface of the workpiece 600 can be ground and cleaned by the friction force between the non-woven fabric 400 and the surface of the workpiece 600. In one embodiment, in order to ensure that the non-woven fabric 400 is always well coated on the special-shaped grinding heads 300 during the movement of the special-shaped grinding heads 300, the automatic grinding equipment further comprises a torque motor, and the torque motor applies force to the non-woven fabric 400 during the movement of the special-shaped grinding heads 300 so that the non-woven fabric 400 can be always coated on the special-shaped grinding heads 300.
In addition, in one embodiment, as shown in fig. 1, the surface to be cleaned of the workpiece 600 is elongated, the profiled grinding head 300 can cover and clean the entire width area of the workpiece 600 during the rotation, and the object stage 500 can drive the workpiece 600 to perform the linear translation motion along the length direction of the workpiece 600 besides fixing the workpiece 600, so that the profiled grinding head 300 can clean the entire surface to be cleaned of the workpiece 600.
In the embodiment shown in fig. 2, the respective grinding stone bumps 310 of the profiled grinding stones 300 are all equal in length, and correspondingly, the surface to be cleaned of the workpiece 600 is also flat. It is to be appreciated that in other embodiments where the surface of the workpiece 600 to be cleaned is not flat, such as in the shape of an arc, the contoured wheel head 300 may include grinding head points 310 of unequal lengths, with the end surfaces of the contoured wheel head 300 adjacent the surface of the workpiece 600 also being in the shape of an arc for conforming to the surface of the workpiece 600 to be cleaned. In the electronic industry, 2.5D screens are widely used, and the 2.5D screens can make the surfaces of electronic products look like water drops without overflowing, so that the electronic products have more visual tension. The middle part of the 2.5D screen is the same as the common 2D screen in plane, except that the edge of the 2.5D screen is in a certain radian, so that the edge of the screen looks like a water drop. In the embodiment shown in fig. 4, the profiled grinding heads 300 can cover and clean the 2.5D surface of the workpiece 600, the profiled grinding heads 300 include a central region 317 and an edge region 318, the grinding head points 310 located in the central region 317 are equal in length, and the grinding head points 310 located in the edge region 318 are sequentially increased in length in a direction away from the central region 317 for conforming to the 2.5D surface of the workpiece 600, and the grinding head points 310 can cover and clean the 2.5D surface of the workpiece 600 when the profiled grinding heads 300 are pressed down and make a rotational movement.
It is to be understood that, in other embodiments, when the surface to be cleaned of the workpiece 600 is a 3D arc surface, the end surfaces of the shaped grinding stones 300 near the surface of the workpiece 600 are also arc-shaped, the shaped grinding stones 300 have a center, the grinding stone peaks 310 sequentially increase in length toward a direction away from the center for conforming to the 3D arc surface of the workpiece 600, and the grinding stone peaks 310 are capable of covering and cleaning the 3D arc surface of the workpiece 600 when the shaped grinding stones 300 are pressed down and make a rotational movement.
According to the automatic grinding and cleaning equipment, the structure of the special-shaped grinding head and the connection relation between the special-shaped grinding head and the driving piece, the non-woven fabric and the objective table are reasonably arranged, the elasticity of the salient points of the grinding head is utilized, the special-shaped grinding head can be pressed down to be in surface contact with the surface of a workpiece under the action of the driving piece, when the special-shaped grinding head rotates under the action of the driving piece, the surface of the workpiece can be cleaned in a rotating grinding mode, the cleaning effect is good, the cleaning efficiency is high, and a large amount of manpower can be replaced.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An automated abrasive cleaning device for cleaning a surface of a workpiece, comprising:
the driving piece is connected with one end of the special-shaped grinding head and is used for driving the special-shaped grinding head to do lifting and rotating motion;
the special-shaped grinding head comprises more than two elastic grinding head salient points, and the grinding head salient points can cover and clean the whole surface to be cleaned of the workpiece when rotating;
the non-woven fabric is coated at the other end, far away from the driving piece, of the special-shaped grinding head and is used for cleaning the surface to be cleaned of the workpiece; and
and the object stage is used for bearing and fixing the workpiece.
2. The automatic grinding cleaning device of claim 1, wherein the profiled grinding head is of a cotton swab integrated bump type, each cotton swab corresponding to one grinding head bump.
3. The automatic abrasive cleaning device according to claim 1, wherein the grinding head protrusions comprise a fixedly connected cylindrical body and an arc-shaped body protruding outward toward the surface of the workpiece, the grinding head protrusions are elastically deformable in an overpressure state when lowered into contact with the surface of the workpiece, and the arc-shaped body can be flattened so that the grinding head protrusions can make surface contact with the surface of the workpiece when making rotational motion.
4. The automated abrasive cleaning apparatus of claim 3 further comprising a control system coupled to said drive member for controlling the distance of descent of said profiled grinding head.
5. The automatic grinding cleaning device of claim 3, wherein the grinding head protrusions are arranged in a staggered manner in a dot matrix, and the cleaning ranges of adjacent grinding head protrusions are overlapped in a staggered manner.
6. The automatic grinding and cleaning device of claim 1, further comprising a torque motor for applying force to the non-woven fabric so that the non-woven fabric can be always coated on the special-shaped grinding head.
7. The automatic grinding and cleaning device of claim 1, wherein the object stage can drive the workpiece to make a linear translational motion, so that the special-shaped grinding head can clean the whole surface to be cleaned of the workpiece.
8. The automatic grinding and cleaning device of claim 1, wherein the shaped grinding heads comprise grinding head protrusions with different lengths, and the end surfaces of the shaped grinding heads close to the surface of the workpiece are cambered surfaces and are used for being matched with the surface of the workpiece to be cleaned.
9. The automated abrasive cleaning apparatus of claim 8, wherein said profiled grinding heads are capable of covering and cleaning a 2.5D surface of said workpiece, said profiled grinding heads including a central region and an edge region, wherein the grinding head points located in said central region have equal lengths, and wherein the grinding head points located in said edge region have lengths that increase in sequence away from said central region for conforming to a 2.5D surface of said workpiece.
10. The automatic grinding and cleaning device of claim 1, further comprising a connecting assembly, wherein the connecting assembly is arranged between the driving member and the special-shaped grinding head, and the connecting assembly can perform lifting and rotating motions under the action of the driving member so as to drive the special-shaped grinding head to perform lifting and rotating motions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911023274.1A CN110587477A (en) | 2019-10-25 | 2019-10-25 | Automatic grinding and cleaning equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911023274.1A CN110587477A (en) | 2019-10-25 | 2019-10-25 | Automatic grinding and cleaning equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110587477A true CN110587477A (en) | 2019-12-20 |
Family
ID=68850348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911023274.1A Pending CN110587477A (en) | 2019-10-25 | 2019-10-25 | Automatic grinding and cleaning equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110587477A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI707728B (en) * | 2020-01-06 | 2020-10-21 | 大陸商業成科技（成都）有限公司 | Improved grinding and cleaning device |
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|---|---|---|---|---|
| JP3236780B2 (en) * | 1996-05-23 | 2001-12-10 | 坂東機工株式会社 | Method and machine for grinding peripheral edge of glass plate |
| CN2474666Y (en) * | 2001-04-13 | 2002-01-30 | 刘浩 | Steel mould cleaning machine |
| CN102198623A (en) * | 2011-05-09 | 2011-09-28 | 苏州大学 | Elastic fine grinding device for aspherical part |
| CN203664279U (en) * | 2014-01-02 | 2014-06-25 | 中芯国际集成电路制造(北京)有限公司 | Wafer cleaning brush |
| CN205674013U (en) * | 2016-05-31 | 2016-11-09 | 中芯国际集成电路制造（天津）有限公司 | Clean device and chemical mechanical polishing device |
| CN207386011U (en) * | 2017-09-19 | 2018-05-22 | 苏州稻香村食品有限公司 | A kind of moon cake device for cleaning conveying belt |
| CN208378022U (en) * | 2018-05-16 | 2019-01-15 | 哈尔滨理工大学 | Non-woven fabrics automatic deviation rectifying device is stretched in a kind of drawing |
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2019
- 2019-10-25 CN CN201911023274.1A patent/CN110587477A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3236780B2 (en) * | 1996-05-23 | 2001-12-10 | 坂東機工株式会社 | Method and machine for grinding peripheral edge of glass plate |
| CN2474666Y (en) * | 2001-04-13 | 2002-01-30 | 刘浩 | Steel mould cleaning machine |
| CN102198623A (en) * | 2011-05-09 | 2011-09-28 | 苏州大学 | Elastic fine grinding device for aspherical part |
| CN203664279U (en) * | 2014-01-02 | 2014-06-25 | 中芯国际集成电路制造(北京)有限公司 | Wafer cleaning brush |
| CN205674013U (en) * | 2016-05-31 | 2016-11-09 | 中芯国际集成电路制造（天津）有限公司 | Clean device and chemical mechanical polishing device |
| CN207386011U (en) * | 2017-09-19 | 2018-05-22 | 苏州稻香村食品有限公司 | A kind of moon cake device for cleaning conveying belt |
| CN208378022U (en) * | 2018-05-16 | 2019-01-15 | 哈尔滨理工大学 | Non-woven fabrics automatic deviation rectifying device is stretched in a kind of drawing |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI707728B (en) * | 2020-01-06 | 2020-10-21 | 大陸商業成科技（成都）有限公司 | Improved grinding and cleaning device |
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Application publication date: 20191220 |