KR20130002643A - Portable standing grinder with dust collection in a vacuum using a cyclone - Google Patents

Portable standing grinder with dust collection in a vacuum using a cyclone Download PDF

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Publication number
KR20130002643A
KR20130002643A KR1020110063721A KR20110063721A KR20130002643A KR 20130002643 A KR20130002643 A KR 20130002643A KR 1020110063721 A KR1020110063721 A KR 1020110063721A KR 20110063721 A KR20110063721 A KR 20110063721A KR 20130002643 A KR20130002643 A KR 20130002643A
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KR
South Korea
Prior art keywords
dust
cyclone
air
grinder
discharged
Prior art date
Application number
KR1020110063721A
Other languages
Korean (ko)
Inventor
노태정
이일영
Original Assignee
동명대학교산학협력단
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 동명대학교산학협력단 filed Critical 동명대학교산학협력단
Priority to KR1020110063721A priority Critical patent/KR20130002643A/en
Publication of KR20130002643A publication Critical patent/KR20130002643A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/0078—Safety devices protecting the operator, e.g. against accident or noise
    • B23Q11/0096—Safety devices protecting the operator, e.g. against accident or noise protecting against noise
    • 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
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • 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
    • B24B55/10—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided
    • B24B55/102—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided with rotating tools
    • 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
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/10—Single-purpose machines or devices
    • B24B7/18—Single-purpose machines or devices for grinding floorings, walls, ceilings or the like
    • B24B7/182—Single-purpose machines or devices for grinding floorings, walls, ceilings or the like for walls and ceilings

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)

Abstract

According to the present invention, the worker grinds the interior and exterior surfaces of a building such as a ceiling, a wall, and a floor in a standing state while moving a lightweight polishing machine, and collects dust generated during polishing, thereby simultaneously performing the polishing operation and the dust collection. The present invention relates to a vacuum collecting standing grinder using a cyclone.
The portable vacuum dusting standing grinder utilizing the cyclone according to the present invention comprises a polishing machine and a vacuum dust collecting part connected to the polishing machine and having a cyclone apparatus and dust box, wherein the polishing machine is used to polish the surface. A head having a pad; A hand motor having a driving motor for generating a driving force for rotating the polishing pad and an on / off switch; The head portion and the hand portion, and characterized in that it comprises a connecting rod which is a passage of the suctioned dust.

Description

PORTABLE STANDING GRINDER WITH DUST COLLECTION IN A VACUUM USING A CYCLONE}

The present invention relates to an environmentally friendly vacuum dusting standing grinder, and more particularly, to compensate for the disadvantages of the conventional pepper suction machine, while the worker polishes the ceiling, walls, floors, etc. in a standing state while moving the lightweight polishing machine, and occurs when polishing. The present invention relates to a vacuum dusting standing grinder using a cyclone that can simultaneously perform dusting and dusting by collecting dust directly.

In general, the grinding machine used in order to effectively carry out work such as painting on high surface such as a wall or a vertical structure has to be done a lot of time and money in advance and then smooth the surface of the wall or a vertical structure. Polishing should be done.

Such surface polishing is to remove foreign substances attached to the surface, smooth the welded area, or remove the corrosion area by installing scaffolding or using equipment such as an expensive ladder truck. Use a hand grinder to do the job.

However, because the hand grinder is small, in the case of a to-be-polished surface that requires strong polishing, the grinder's capacity is low to obtain the desired polishing quality. In order to solve this problem, a grinder using a large capacity motor is used. As a result, the weight of the grinder increases, which makes it difficult for a worker to carry and use, and also does not work smoothly.

In addition, in the case of the polishing machine for polishing the floor, the worker may perform work in a state of bending his knees or kneeling, which is very inconvenient, and the weight of the polishing machine itself is heavy, so that the fatigue strength of the work is great to perform the polishing work while moving. In addition, the dust generated during the grinding operation is blown in all directions to increase the harmful concentration of dust in the air, which directly affects the health of the worker's respiratory system.

The present invention has been made to solve the above problems, an object of the present invention, the operator is suitable for hands, free to move, and easy to perform the polishing work on the surface of high places such as walls and ceilings as well as floor. It is to provide a portable vacuum dusting standing grinder that utilizes a cyclone capable.

Still another object of the present invention is to provide a portable vacuum dusting standing grinder using cyclones for collecting dust generated during polishing to improve the working environment of the worker to protect the health of the worker and the environment of the workplace.

In order to solve the above problems, the portable vacuum dusting standing grinder using the cyclone according to the present invention includes a polishing machine and a vacuum dust collecting part connected to the polishing machine and having a cyclone apparatus and dust, and the polishing machine The head portion having a polishing pad for polishing the surface; A hand motor having a driving motor for generating a driving force for rotating the polishing pad and an on / off switch; The head portion and the hand portion, and characterized in that it comprises a connecting rod which is a passage of the suctioned dust.

Preferably, a cover is attached to an upper portion of the polishing pad, a polishing wheel is installed on the upper portion of the cover, the polishing wheel is connected to a flexible shaft by a driving motor, and the head part is a dust suction port for sucking dust. Is provided, the dust suction port is connected to the connecting member for connecting the head and the lower end of the connecting rod, the upper end of the connecting rod is further provided with a hose connecting portion for discharging the dust to the vacuum dust collection unit, the output of the drive motor A variable resistor for adjusting is further installed. In addition, the cyclone device, the suction port for sucking dust and air; An air outlet through which air is discharged while the air and dust are rotated, and a dust outlet through which only dust is discharged; The filter is installed on the upper air outlet, the dust and air is rotated through the passage between the outer wall and the primary inner wall dust is discharged to the dust outlet, the air is discharged to the outside through the air outlet, the filter The collected fine dust is discharged through the inner dust discharge port, and the filter filters the fine dust included in the discharged air, and the filtered air is discharged to the air discharge unit, and a motor cooling unit is installed adjacent to the air discharge unit. The secondary inner wall is upwardly formed between the primary inner wall and the inner dust outlet, and discharges the dust of the filter through the inner dust outlet formed inside the secondary inner wall.

Portable vacuum dusting standing grinder using the cyclone according to the present invention having the characteristics as described above, the operation period is reduced as the operator's work is convenient when polishing the interior and exterior surfaces of the building to reduce the work cost In addition, it can reduce the risks of worker's health by providing workers with a clean working environment and prevent industrial accidents caused by diseases of the respiratory organs. The efficiency can be increased, and the structure of reducing the noise of the vacuum dust collector can protect the operator from the noise pollution generated during work, and the structure of the vacuum dust collector can be improved by adopting the cyclone method.

1 is a perspective view of a standing grinder according to the present invention.
2 is a front view of the vacuum dust collector of the standing grinder according to the present invention.
3 is a detailed view of a cyclone device according to the present invention.
4 is a partial cutaway view of the interior of a cyclone device according to the present invention.
5 is a perspective view of the grinding machine of the standing grinder according to the present invention.

Hereinafter, a preferred embodiment of a portable vacuum dusting standing grinder using a cyclone according to the present invention will be described with reference to FIGS. 1 to 5. Hereinafter, with reference to the accompanying drawings will be described in detail the implementation and embodiments of the present invention to be easily carried out by those skilled in the art. However, the present invention may be embodied in many different forms and should not be construed as limited to the embodiments and embodiments set forth below. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention. Similar parts are designated by like reference numerals.

1 to 5, the portable vacuum dusting standing grinder using the cyclone according to the present invention for polishing the interior and exterior surfaces of the building, is connected to the polishing machine 50, the polishing machine 50 and cyclone And a vacuum collector 40 having an apparatus 60 and a dust box 407. The grinder 50 includes a head portion 520 having a polishing pad 524 for polishing a surface thereof; A hand motor 511 having a driving motor 511 for generating a driving force for rotating the polishing pad 520 and an on / off switch 513; The head part 520 and the hand part 510 are connected to each other, and include a connecting rod 515 that serves as a passage of the sucked dust.

A cover 526 is attached to an upper portion of the polishing pad 524, and an abrasive wheel 525 is installed on an upper portion of the cover 526, and the polishing wheel 525 includes a drive motor 511 and a flexible shaft ( 527). The polishing wheel 525 is connected to a shaft portion (not shown) to which the flexible shaft 527 is connected in a circular disk shape and rotates by receiving the rotational force generated by the driving motor 511 through the flexible shaft 527. As the polishing wheel 525 rotates, the polishing pad 524 connected to the polishing wheel 525 rotates to perform polishing of interior and exterior surfaces. The cover 590 is installed to surround the polishing pad 524 in a container shape so that dust generated from the polishing pad 524 is not scattered to the outside during the polishing operation. In other words, the cover 526 is a radial polishing pad 254, so that the dust generated by the role of the suction fan during rotation can be collected by itself without scattering. The polishing wheel 525 is connected to the extension shaft 528 extending downward from the connecting member 521, the polishing wheel 525 and the extension shaft 528 is a gimbal or hinge to be adjusted at a constant angle It is preferable to connect, and the polishing wheel 525 is preferably installed in a housing (not shown).

In addition, the head part 520 is provided with dust suction holes 522 and 523 for sucking dust, and the dust suction holes 522 and 523 are connected to the head 520 and the lower end of the connecting rod 515. Is connected to, the upper end of the connecting rod 515 is further provided with a hose connecting portion 514 for discharging the dust to the vacuum dust collecting portion (40). The first dust intake 522 of the dust intake is configured in the connecting member 521, the second dust intake 523 is connected to the cover 526, the dust intake is connected by a flexible hose. In addition, the hose connecting portion 514 is connected to the cyclone device 60 and the flexible hose 410 of the vacuum dust collector 40, the dust generated during the grinding operation is the second dust suction opening 523 connected to the cover 526 Through the hollow path of the first dust suction port 522 and the connecting rod 515 through the hose connecting portion 514 and the flexible hose 410 is moved to the cyclone device (60). As described above, the power for collecting the dust to the cyclone device 60 is provided by the dust collecting motor 405 installed in the vacuum dust collecting unit 40.

The hand part 510 uses a plastic injection product, and the drive motor 511 installed in the hand part is preferably a D / C motor, and is operated for an on / off switch to transmit rotational force to the flexible shaft 527. Thereby rotating the polishing pad 524 through the polishing wheel 525. The hand part is further provided with a variable resistor for adjusting the output of the drive motor, the input voltage of the drive motor 511 is connected to the power supply unit 406 of the vacuum dust collector 40 is supplied with power. The power supply unit 406 is connected to a power line (not shown).

Due to the driving motor 511 installed in the hand part 510, the weight of the grinder 50, in particular, the connecting rod 515 is likely to be concentrated on the arm of the worker, but the weight of the connecting rod 515 is not concentrated on the arm of the worker. By forming a belt (not shown) on the connecting rod 515 to be distributed to the body of the worker by wearing the belt on the body during the polishing operation, the weight of the connecting rod concentrated on the arm is dispersed to reduce the haptic weight felt by the worker.

The cyclone apparatus 60 is manufactured to suck dust and discharge air through centrifugal force.By way of referring to Bernoulli's law, the air sucked in the cyclone apparatus can maintain a suction flow rate without losing pressure. It is preferable to adopt the cyclone structure of the structure, the inside of the cyclone device 60 is composed of the primary inner wall 609 and the secondary inner wall 610 is configured by the air acceleration method applying the Bernoulli law.

The cyclone device 60, the suction port for inhaling dust and air (607); An air outlet 603 through which air is discharged while the air and dust are rotated, and a dust outlet 608 through which only dust is discharged; The filter 604 is installed on the air outlet 603, the dust and air is rotated through the passage between the outer wall 605 and the primary inner wall 609 while the dust is discharged to the dust outlet 608 The air is discharged to the outside through the air outlet 603.

A secondary inner wall 610 is formed upward between the primary inner wall 609 and the inner dust outlet 602, and the filter 604 through the inner dust outlet 602 formed inside the secondary inner wall 610. Dust is discharged from the filter 604, the fine dust collected in the filter 604 is discharged through the inner dust outlet 602 is accumulated in the dust bag (not shown) in the dust box 407, the desorption of the filter 604 Fine dust falling from the filter during the operation flows into the inner dust discharge port (602).

The dust collected by the grinder 50 passes through the hose connecting portion 514 and the hose 401 through the first suction port 601 and the second suction port 607 and the outer wall 630 and the primary inner wall of the cyclone apparatus 60. Rotating through the passage between 609, the relatively heavy dust is discharged to the dust discharge port 608 is accumulated in the dust bag, the air flows through the passage between the primary inner wall 609 and secondary inner wall 610 Through the air outlet 603 through the air outlet 404 is discharged to the outside, the filter 604 is installed on the upper portion of the air outlet 603 and clean air by filtering before the air is discharged to the outside To be discharged.

That is, the dust is accumulated in the dust bag of the dust box 407 while passing through the cyclone device 60, the air containing fine dust is filtered through a filter (604), and then clean air is filtered through the dust collecting motor 405 It is discharged to the air outlet 404. As described above, the air sucked by the secondary inner wall 610 is prevented from being discharged to the air outlet 603 without removing dust, and the inside of the cyclone device is the outer wall 605 and the primary inner wall 609. And three walls of the secondary inner wall 610 such that the air does not lose rotational force while dust is removed from the air. That is, while dust including dust moves along the passage between the outer wall 605 and the primary inner wall 609 and the passage between the primary inner wall 609 and the secondary inner wall 610 without losing rotational force, the dust is discharged from the dust outlet ( 608, the air is discharged to the air outlet 603.

The filter 604 is a membrane filter, the filter replacement door 402 is installed on the upper side of the filter to enable replacement and cleaning of the filter. A dust collecting motor 405 is installed at an outer upper portion of the filter 604, and the dust collecting motor 405 is connected to the air discharge part 404 and the motor cooling part 403. The motor cooling unit 403 is installed adjacent to the air discharge unit 404, and the motor cooling unit 403 serves to prevent overheating of the dust collecting motor 405. Preferably, the air outlet 404 and the motor cooling unit 403 separate the installation space by a separator plate. As described above, the air discharge part 404 and the motor cooling part 403 are separated to prevent the air of the air discharge part 404 from entering the motor cooling part 403, and the dust collecting motor 405 is generated at the time of operation. Install the sound absorbing material in the inside of the air outlet so that the air can be discharged while reducing the noise.

The cyclone device 60 is installed in the vacuum dust collector 40, the cyclone device is to separate the dust by the centrifugal force, the dust box 407 is installed in the lower, the collection box 407 Dust bags are installed to accumulate dust through the cyclone system. In addition, the front of the vacuum dust collecting unit 40 is composed of two doors, the upper door 409 is used when checking the abnormality of the cyclone device 60 and the dust collecting motor 405, the lower door 408 ) Is used to remove dust accumulated in the dust bag of the dust box 407 or to replace the dust bag. In addition, the lower portion of the vacuum dust collecting part 40 is provided with a moving means such as wheels can be polished and dust collecting work while the worker easily moves.

A filter 604 is installed at the upper portion of the cyclone apparatus 60 to filter fine dust which may be included in the air when the air other than the dust collected by the cyclone apparatus is discharged to the air outlet 603, and the filtered Air is discharged to the air discharge port 404 configured on the side of the vacuum dust collecting unit 40. That is, the filter 604 filters the fine dust included in the discharged air, and the filtered air is discharged to the air discharge unit 404. As described above, the cyclone apparatus 60 filters the dust sucked into the vacuum dust collector 40 first and accumulates in the dust bag, and the filter 604 filters the fine dust second.

A protruding member 606 protruding from the upper outer circumference of the outer wall 605 of the cyclone apparatus 60 is formed, and the protruding member 606 has a vacuum dust collecting part (60) to fix the cyclone apparatus 60 in place. 40) It is detachably installed in the insertion part (not shown) formed inside.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. Therefore, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention but to limit the scope of the present invention. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

40. Vacuum collecting part 401. Hose
402 Filter replacement door 403 Motor cooling unit
404. Air outlet 405. Dust collector motor
406. Power Supply 407. Dust
408.Lower Door 409.Lower Door
50.Hand polisher 510.Hand part
511.Motor 512. Variable resistance
513.On / off switch 514.Hose connection
515.Connecting rod
520.Head portion 521.Connecting member
522.First dust intake 523, Second dust intake
524. Grinding pad 525. Grinding wheel
526.Cover 527.Flexible shaft
528 Extension shaft 60 Cyclone device
601.First inlet 602.Inner dust outlet
603.Air outlet 604.Filter
605.Outer wall 606.Protrusion member
607.2nd inlet 608.dust outlet
609.1 Car Interior Wall 610.2 Car Interior Wall

Claims (9)

In the standing grinder to polish the interior and exterior surfaces of the building,
The grinder includes a grinder and a vacuum dust collector connected to the grinder and having a cyclone apparatus and a dust collector,
The above-
A head portion having a polishing pad for polishing a surface;
A hand motor having a driving motor for generating a driving force for rotating the polishing pad and an on / off switch;
A connecting rod which connects the head and the hand and serves as a passage of the sucked dust;
Portable vacuum dusting standing grinder using a cyclone, characterized in that comprising a.
The method of claim 1,
A cover is attached to an upper portion of the polishing pad, and a polishing wheel is installed on an upper portion of the cover, wherein the polishing wheel is connected to a driving motor and a flexible shaft.
The method of claim 1,
Portable vacuum dusting standing grinder using a cyclone, characterized in that the variable resistance for adjusting the output of the drive motor is further installed in the hand portion.
The method of claim 1,
The head part is provided with a dust suction port for suctioning dust, the dust suction port is connected to the connecting member for connecting the head and the lower end of the connecting rod, the hose connecting portion for discharging dust to the vacuum dust collector at the upper end of the connecting rod Portable vacuum dusting standing grinder using a cyclone, characterized in that is further provided.
The method of claim 1,
Wherein the cyclone device comprises:
Inlet for inhaling dust and air;
An air outlet through which air is discharged while the air and dust are rotated, and a dust outlet through which only dust is discharged;
A filter installed above the air outlet;
Includes, the dust and air is rotated through the passage between the outer wall and the primary inner wall dust is discharged to the dust outlet, the air is discharged to the outside through the air outlet, the fine dust collected in the filter is the inner dust outlet Portable vacuum dusting standing grinder using a cyclone, characterized in that the discharge through.
6. The method of claim 5,
The filter is a portable vacuum dusting standing grinder using a cyclone, characterized in that for filtering the fine dust contained in the discharged air, the filtered air is discharged to the air discharge.
The method according to claim 6,
Portable vacuum dusting standing grinder using a cyclone, characterized in that the motor cooling unit is installed adjacent to the air discharge.
6. The method of claim 5,
Portable vacuum dusting standing using a cyclone, characterized in that the secondary inner wall is formed upward between the primary inner wall and the inner dust outlet, the dust of the filter is discharged through the inner dust outlet formed inside the secondary inner wall. grindstone.
In paragraph 5
Portable vacuum dusting standing grinder using a cyclone, characterized in that the upper outer periphery of the outer wall is formed to protrude protruding member.
KR1020110063721A 2011-06-29 2011-06-29 Portable standing grinder with dust collection in a vacuum using a cyclone KR20130002643A (en)

Priority Applications (1)

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KR1020110063721A KR20130002643A (en) 2011-06-29 2011-06-29 Portable standing grinder with dust collection in a vacuum using a cyclone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110063721A KR20130002643A (en) 2011-06-29 2011-06-29 Portable standing grinder with dust collection in a vacuum using a cyclone

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107377173A (en) * 2017-09-18 2017-11-24 盐城方正医药科技有限公司 A kind of dust-free grinding device of Azithromycin dispersible tablet
CN111185808A (en) * 2019-12-04 2020-05-22 靖州县金心笔业有限责任公司 A knife sharpening device for pencil processing
CN111745489A (en) * 2020-07-10 2020-10-09 甘肃第三建设集团有限公司 Multifunctional grinding machine for building
CN113523923A (en) * 2021-06-22 2021-10-22 安徽金星钛白（集团）有限公司 Surface treatment device for roll-in grinder
CN114367887A (en) * 2022-01-24 2022-04-19 上海二十冶建设有限公司 Wall grinding device for construction
KR102520331B1 (en) 2022-07-08 2023-04-11 성지훈 A wall grinding machine for removing the protruding surface of the wall with a dust scattering prevention function
CN117773727A (en) * 2022-11-17 2024-03-29 烟台志攀家居服务有限公司 High-precision machining polishing machine

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107377173A (en) * 2017-09-18 2017-11-24 盐城方正医药科技有限公司 A kind of dust-free grinding device of Azithromycin dispersible tablet
CN111185808A (en) * 2019-12-04 2020-05-22 靖州县金心笔业有限责任公司 A knife sharpening device for pencil processing
CN111745489A (en) * 2020-07-10 2020-10-09 甘肃第三建设集团有限公司 Multifunctional grinding machine for building
CN113523923A (en) * 2021-06-22 2021-10-22 安徽金星钛白（集团）有限公司 Surface treatment device for roll-in grinder
CN114367887A (en) * 2022-01-24 2022-04-19 上海二十冶建设有限公司 Wall grinding device for construction
KR102520331B1 (en) 2022-07-08 2023-04-11 성지훈 A wall grinding machine for removing the protruding surface of the wall with a dust scattering prevention function
CN117773727A (en) * 2022-11-17 2024-03-29 烟台志攀家居服务有限公司 High-precision machining polishing machine

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