CN113500481A - Paper tube corner polishing equipment - Google Patents
Paper tube corner polishing equipment Download PDFInfo
- Publication number
- CN113500481A CN113500481A CN202110909808.1A CN202110909808A CN113500481A CN 113500481 A CN113500481 A CN 113500481A CN 202110909808 A CN202110909808 A CN 202110909808A CN 113500481 A CN113500481 A CN 113500481A
- Authority
- CN
- China
- Prior art keywords
- paper tube
- plate
- screw rod
- bottom plate
- grinding device
- 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.)
- Pending
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Classifications
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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
- 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
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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
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
- B24B41/067—Work supports, e.g. adjustable steadies radially supporting workpieces
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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
- B24B47/00—Drives or gearings; Equipment therefor
- B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
- B24B47/12—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces by mechanical gearing or electric power
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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
- B24B47/00—Drives or gearings; Equipment therefor
- B24B47/20—Drives or gearings; Equipment therefor relating to feed movement
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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
- 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
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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
- 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
- B24B55/12—Devices for exhausting mist of oil or coolant; Devices for collecting or recovering materials resulting from grinding or polishing, e.g. of precious metals, precious stones, diamonds or the like
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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
- B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
- B24B9/007—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor for end faces of tubes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding Of Cylindrical And Plane Surfaces (AREA)
Abstract
The invention discloses a paper tube corner polishing device, which comprises a bottom plate, wherein supporting legs are installed at the bottom end of the bottom plate, a blanking hole is formed in one side of the bottom plate, a fixing frame is arranged on one side of the bottom plate, a polishing mechanism is arranged on one side of the fixing frame, which is close to the blanking hole, a driving motor is arranged on the other side of the fixing frame, a supporting plate is arranged on the other side of the polishing mechanism, the supporting plate is arranged in an arc shape, and the bottom ends of the two sides of the supporting plate are fixedly connected with a telescopic rod. The corners of the paper tube are polished, so that the corners of the paper tube are polished more uniformly, and the polishing quality is improved.
Description
Technical Field
The invention relates to the technical field of paper tube processing, in particular to a paper tube corner polishing device.
Background
Paper tube: paper is a tubular object processed from paper. Most paper tubes are spiral paper tubes and seamless paper tubes.
Need polish the edge of paper tube after the paper tube processing, generally polish through artifical handheld abrasive paper now, the efficiency of polishing is lower to the inhomogeneous of polishing, the paper tube edge has more burr. Therefore, the invention provides a paper tube corner polishing device to solve the problems in the background art.
Disclosure of Invention
The invention aims to provide a paper tube corner polishing device to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a paper tube corner polishing device comprises a bottom plate, wherein supporting legs are mounted at the bottom end of the bottom plate, a blanking hole is formed in one side of the bottom plate, a fixing frame is arranged on one side, close to the blanking hole, of the fixing frame, a polishing mechanism is arranged on one side of the fixing frame, a driving motor is arranged on the other side of the fixing frame, a supporting plate is arranged on the other side of the polishing mechanism, the supporting plate is arranged in an arc shape, telescopic rods are fixedly connected to the bottom ends of the two sides of the supporting plate, the bottom end of each telescopic rod is fixedly connected with the bottom plate, a threaded sleeve is fixedly connected to the middle portion of the bottom end of the supporting plate, the threaded sleeve is in threaded connection with an adjusting screw rod, the adjusting screw rod penetrates through the bottom plate, the adjusting screw rod is rotatably connected with the bottom plate through a bearing, a hand wheel is fixedly connected to the bottom end of the adjusting screw rod, a fixing mechanism is mounted at the upper end of the supporting plate, a storage tank is arranged below the blanking hole, a storage tank support is arranged at the bottom end of the storage tank, and the supporting legs are fixedly connected with the storage tank supports, one side box wall of the storage box is communicated with an exhaust pipe, and an exhaust fan is installed in the exhaust pipe.
As a further scheme of the invention: grinding machanism includes the drive shaft, and the drive shaft runs through the mount, and the drive shaft passes through the bearing and rotates the connection mount, and the drive shaft is connected driving motor, driving motor and mount.
As a still further scheme of the invention: the other end of the driving shaft is fixedly connected with a turntable, and the turntable is perpendicular to the driving shaft.
As a still further scheme of the invention: the outer edge of the turntable is fixedly connected with a plurality of fixing feet, and threaded holes penetrating through the fixing feet are formed in the fixing feet.
As a still further scheme of the invention: the fixing foot is located at the threaded hole and is provided with a fastening bolt, and a pressing plate is arranged on the fastening bolt.
As a still further scheme of the invention: the pressing plate is provided with a through hole corresponding to the fastening bolt, and sand paper is arranged between the pressing plate and the rotary table.
As a still further scheme of the invention: the fixing mechanism comprises a support, the support is arranged to be C-shaped, and the bottom end of the support is fixed to the edge of the supporting plate.
As a still further scheme of the invention: the middle part department of support installs the lift lead screw, and the support corresponds lift lead screw and seted up the screw hole.
As a still further scheme of the invention: the lower end of the lifting screw rod is connected with a clamping plate, the clamping plate is rotatably connected with the lifting screw rod, and the clamping plate is arranged into an arc shape.
As a still further scheme of the invention: the top end of the lifting screw rod is fixedly connected with a knob.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the abrasive paper is placed on the turntable, and the abrasive paper and the turntable are fixed by the fastening bolt and the pressing plate.
2. According to the invention, the paper tube is placed on the supporting plate, the paper tube is pushed to be tightly attached to the abrasive paper, the knob is rotated, the paper tube is clamped by the clamping plate and the supporting plate, and the arc-shaped clamping plate and the arc-shaped supporting plate are arranged, so that the paper tube fixing device is suitable for fixing paper tubes with different diameters and can prevent the paper tube from being deformed due to extrusion.
3. According to the invention, the driving motor is started to drive the driving shaft and the turntable to rotate, so that the abrasive paper is driven to rotate, corners of the paper tube are polished, the exhaust fan is started during polishing, and chips generated by polishing penetrate through the blanking hole to enter the storage box, so that the collection of the chips is facilitated.
4. According to the polishing equipment, the rotary hand wheel drives the adjusting screw rod to rotate, the adjusting screw rod moves along the threaded sleeve, the height of the supporting plate can be adjusted, after the middle of the abrasive paper is abraded, the height of the supporting plate can be adjusted, the height of the paper tube to be polished can be adjusted, the edge of the abrasive paper is used for polishing the paper tube, the abrasive paper is fully utilized, the driving motor is used for driving the rotary table and the abrasive paper to rotate, corners of the paper tube are polished, polishing efficiency can be improved, corners of the paper tube are polished more uniformly, and polishing quality is improved.
Drawings
Fig. 1 is a schematic structural diagram of a paper tube corner polishing device.
Fig. 2 is a side view of a paper tube corner grinding apparatus.
Fig. 3 is a schematic structural diagram of a polishing mechanism in a paper tube corner polishing device.
Fig. 4 is a schematic structural diagram of a fixing mechanism in a paper tube corner polishing device.
In the figure: 1. the bottom plate, 101, the supporting leg, 102, the unloading hole, 2, the mount, 3, grinding machanism, 301, the drive shaft, 302, the carousel, 303, abrasive paper, 304, fixed foot, 305, fastening bolt, 306, the clamp plate, 4, driving motor, 5, the backup pad, 6, the telescopic link, 7, the thread bush, 8, accommodate the lead screw, 9, the hand wheel, 10, fixed establishment, 110, the support, 111, the lift lead screw, 112, splint, 113, the knob, 11, the storage tank, 12, the storage tank support, 13, the blast pipe, 14, the exhaust fan.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, in the embodiment of the invention, a paper tube corner polishing device comprises a bottom plate 1, supporting legs 101 are installed at the bottom end of the bottom plate 1, a blanking hole 102 is formed at one side of the bottom plate 1, a fixing frame 2 is arranged at one side of the bottom plate 1, which is located at the blanking hole 102, a polishing mechanism 3 is arranged at one side of the fixing frame 2, which is close to the blanking hole 102, a driving motor 4 is arranged at the other side of the fixing frame 2, a supporting plate 5 is arranged at the other side of the polishing mechanism 3, the supporting plate 5 is arranged in an arc shape, telescopic rods 6 are fixedly connected at the bottom ends of two sides of the supporting plate 5, the bottom end of each telescopic rod 6 is fixedly connected with the bottom plate 1, a threaded sleeve 7 is fixedly connected at the middle part of the bottom end of the supporting plate 5, the threaded sleeve 7 is in threaded connection with an adjusting screw rod 8, the adjusting screw rod 8 penetrates through the bottom plate 1, the adjusting screw rod 8 is rotatably connected with the bottom plate 1 through a bearing, a hand wheel 9 is fixedly connected at the bottom end of the adjusting screw rod 8, fixing mechanism 10 is installed to backup pad 5 upper end, and bottom plate 1 is located the below department of unloading hole 102 and is equipped with storage tank 11, and storage tank 11 bottom is equipped with storage tank support 12, and storage tank support 12 fixed connection supporting leg 101, one side tank wall intercommunication blast pipe 13 of storage tank 11 install exhaust fan 14 in the blast pipe 13.
Referring to fig. 3, the polishing mechanism 3 includes a driving shaft 301, the driving shaft 301 penetrates through the fixing frame 2, the driving shaft 301 is rotatably connected to the fixing frame 2 through a bearing, the driving shaft 301 is connected to the driving motor 4, the driving motor 4 and the fixing frame 2, the other end of the driving shaft 301 is fixedly connected to the turntable 302, the turntable 302 is perpendicular to the driving shaft 301, a plurality of fixing legs 304 are fixedly connected to the outer edge of the turntable 302, threaded holes penetrating through the fixing legs 304 are formed in the fixing legs 304, fastening bolts 305 are installed at the positions, located at the threaded holes, of the fixing legs 304, pressing plates 306 are installed on the fastening bolts 305, through holes are formed in the pressing plates 306 corresponding to the fastening bolts 305, and sand paper 303 is arranged between the pressing plates 306 and the turntable 302.
Referring to fig. 4, the fixing mechanism 10 includes a bracket 110, the bracket 110 is configured to be C-shaped, the bottom end of the bracket 110 is fixed to the edge of the supporting plate 5, a lifting screw 111 is installed at the middle portion of the bracket 110, the bracket 110 is provided with a threaded hole corresponding to the lifting screw 111, the lower end of the lifting screw 111 is connected to a clamping plate 112, the clamping plate 112 is rotatably connected to the lifting screw 111, the clamping plate 112 is configured to be arc-shaped, and the top end of the lifting screw 111 is fixedly connected to a knob 113.
The working principle of the invention is as follows:
when the abrasive paper tube polishing device is used, abrasive paper 303 is placed on the rotary table 302, the abrasive paper 303 and the rotary table 302 are fixed through the fastening bolts 305 and the pressing plate 306, the structure is designed to facilitate replacement of the abrasive paper 303, a paper tube is placed on the supporting plate 5, the paper tube is pushed to be attached to the abrasive paper 303, the knob 113 is rotated, the paper tube is clamped through the clamping plate 112 and the supporting plate 5, the arc-shaped clamping plate 112 and the supporting plate 5 are arranged to be suitable for fixing paper tubes with different diameters, the paper tube can be prevented from being deformed due to extrusion, the driving motor 4 is started to drive the driving shaft 301 and the rotary table 302 to rotate, the abrasive paper 303 is driven to rotate, corners of the paper tube are polished, the exhaust fan 14 is started during polishing, chips generated by polishing pass through the discharging hole 102 to enter the storage box 11, collection of the chips is facilitated, the hand wheel 9 is rotated to drive the adjusting screw rod 8 to rotate, the adjusting screw rod 8 moves along the threaded sleeve 7, and the height of the supporting plate 5 can be adjusted, after the middle part wearing and tearing of abrasive paper 303, adjust the height of backup pad 5, can adjust the height that needs the paper tube of polishing, utilize abrasive paper 303 edge to polish to the paper tube for abrasive paper 303 is by make full use of, and this equipment of polishing utilizes driving motor 4 to drive carousel 302 and abrasive paper 303 to rotate, polishes the corner of paper tube, can improve the efficiency of polishing, makes more even that the paper tube corner was polished, improves the quality of polishing.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A paper tube corner polishing device comprises a bottom plate (1) and is characterized in that supporting legs (101) are installed at the bottom end of the bottom plate (1), a blanking hole (102) is formed in one side of the bottom plate (1), a fixing frame (2) is arranged on one side, located on the blanking hole (102), of the bottom plate (1), a polishing mechanism (3) is arranged on one side, close to the blanking hole (102), of the fixing frame (2), a driving motor (4) is arranged on the other side of the fixing frame (2), a supporting plate (5) is arranged on the other side, located on the polishing mechanism (3), the supporting plate (5) is arranged in an arc shape, telescopic rods (6) are fixedly connected to the bottom ends of the two sides of the supporting plate (5), the bottom ends of the telescopic rods (6) are fixedly connected to the bottom plate (1), threaded sleeves (7) are fixedly connected to the middle portions of the bottom ends of the supporting plate (5), the threaded sleeves (7) are in threaded connection with an adjusting screw rod (8), and the adjusting screw rod (8) penetrates through the bottom plate (1), and adjusting screw (8) rotate through the bearing and connect bottom plate (1), adjusting screw (8) bottom fixed connection hand wheel (9), fixed establishment (10) are installed to backup pad (5) upper end, bottom plate (1) are located the below department of unloading hole (102) and are equipped with storage tank (11), storage tank (11) bottom is equipped with storage tank support (12), storage tank support (12) fixed connection supporting leg (101), one side tank wall intercommunication blast pipe (13) of storage tank (11), install exhaust fan (14) in blast pipe (13).
2. The grinding device for the paper tube corners as claimed in claim 1, characterized in that the grinding mechanism (3) comprises a driving shaft (301), the driving shaft (301) penetrates through the fixing frame (2), the driving shaft (301) is rotatably connected with the fixing frame (2) through a bearing, the driving shaft (301) is connected with a driving motor (4), and the driving motor (4) is connected with the fixing frame (2).
3. A paper tube corner grinding device according to claim 2, characterized in that the other end of the driving shaft (301) is fixedly connected with a turntable (302), and the turntable (302) is arranged perpendicular to the driving shaft (301).
4. The paper tube corner grinding device as claimed in claim 3, wherein a plurality of fixing feet (304) are fixedly connected to the outer edge of the turntable (302), and threaded holes penetrating through the fixing feet (304) are formed in the fixing feet (304).
5. A paper tube corner grinding device according to claim 4, characterized in that the fixing foot (304) is provided with a fastening bolt (305) at the threaded hole, and a pressing plate (306) is arranged on the fastening bolt (305).
6. A grinding device for corners of paper tubes according to claim 5, characterized in that the pressing plate (306) is provided with a through hole corresponding to the fastening bolt (305), and sand paper (303) is arranged between the pressing plate (306) and the turntable (302).
7. A paper tube corner grinding device according to claim 1, characterized in that the fixing mechanism (10) comprises a bracket (110), the bracket (110) is arranged in a C shape, and the bottom end of the bracket (110) is fixed with the edge of the supporting plate (5).
8. The paper tube corner grinding device according to claim 7, wherein a lifting screw rod (111) is installed in the middle of the support (110), and a threaded hole is formed in the support (110) corresponding to the lifting screw rod (111).
9. The grinding device for the corners of the paper tubes as claimed in claim 8, wherein the lower end of the lifting screw rod (111) is connected with a clamping plate (112), the clamping plate (112) is rotatably connected with the lifting screw rod (111), and the clamping plate (112) is arranged in an arc shape.
10. The paper tube corner grinding device as claimed in claim 9, wherein a knob (113) is fixedly connected to the top end of the lifting screw rod (111).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110909808.1A CN113500481A (en) | 2021-08-09 | 2021-08-09 | Paper tube corner polishing equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110909808.1A CN113500481A (en) | 2021-08-09 | 2021-08-09 | Paper tube corner polishing equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113500481A true CN113500481A (en) | 2021-10-15 |
Family
ID=78016214
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110909808.1A Pending CN113500481A (en) | 2021-08-09 | 2021-08-09 | Paper tube corner polishing equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113500481A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114346801A (en) * | 2022-01-11 | 2022-04-15 | 中山市华盛家具制造有限公司 | Furniture board end surface forming polisher capable of reciprocating step by step |
| CN115139166A (en) * | 2022-09-05 | 2022-10-04 | 徐州旭佩辰机械科技有限公司 | Reciprocating type grinding device of electricity main shaft circumferential surface |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102922384A (en) * | 2012-10-30 | 2013-02-13 | 吴江久升纸业有限公司 | Paper tube end grinding machine |
| CN107234533A (en) * | 2017-08-02 | 2017-10-10 | 刘可 | A kind of Packaging Waste paper tube surface automation peeling smoothing apparatus |
| CN207509009U (en) * | 2017-08-02 | 2018-06-19 | 江门市新会区丰顺纸业有限公司 | A kind of waste paper pipe polishing automation chucking device |
| CN208409437U (en) * | 2018-06-26 | 2019-01-22 | 平湖市大亚纸管有限公司 | A kind of paper tube edge polisher |
| CN209831320U (en) * | 2019-03-15 | 2019-12-24 | 上海管月包装制品有限公司 | Paper tube edge grinding device convenient to fix |
| CN210938470U (en) * | 2019-11-13 | 2020-07-07 | 杭州华泽实业有限公司 | Paper tube edge grinding device |
| CN211565373U (en) * | 2019-12-30 | 2020-09-25 | 江油志新科技有限公司 | Paper tube edge grinding device |
| CN212020204U (en) * | 2020-05-06 | 2020-11-27 | 绍兴俞记纸业有限公司 | A grind a mouthful device for paper tube |
-
2021
- 2021-08-09 CN CN202110909808.1A patent/CN113500481A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102922384A (en) * | 2012-10-30 | 2013-02-13 | 吴江久升纸业有限公司 | Paper tube end grinding machine |
| CN107234533A (en) * | 2017-08-02 | 2017-10-10 | 刘可 | A kind of Packaging Waste paper tube surface automation peeling smoothing apparatus |
| CN207509009U (en) * | 2017-08-02 | 2018-06-19 | 江门市新会区丰顺纸业有限公司 | A kind of waste paper pipe polishing automation chucking device |
| CN208409437U (en) * | 2018-06-26 | 2019-01-22 | 平湖市大亚纸管有限公司 | A kind of paper tube edge polisher |
| CN209831320U (en) * | 2019-03-15 | 2019-12-24 | 上海管月包装制品有限公司 | Paper tube edge grinding device convenient to fix |
| CN210938470U (en) * | 2019-11-13 | 2020-07-07 | 杭州华泽实业有限公司 | Paper tube edge grinding device |
| CN211565373U (en) * | 2019-12-30 | 2020-09-25 | 江油志新科技有限公司 | Paper tube edge grinding device |
| CN212020204U (en) * | 2020-05-06 | 2020-11-27 | 绍兴俞记纸业有限公司 | A grind a mouthful device for paper tube |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114346801A (en) * | 2022-01-11 | 2022-04-15 | 中山市华盛家具制造有限公司 | Furniture board end surface forming polisher capable of reciprocating step by step |
| CN115139166A (en) * | 2022-09-05 | 2022-10-04 | 徐州旭佩辰机械科技有限公司 | Reciprocating type grinding device of electricity main shaft circumferential surface |
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Application publication date: 20211015 |