CN110653714B - Drum head polishing automatic regulating device of musical instrument - Google Patents
Drum head polishing automatic regulating device of musical instrument Download PDFInfo
- Publication number
- CN110653714B CN110653714B CN201910941234.9A CN201910941234A CN110653714B CN 110653714 B CN110653714 B CN 110653714B CN 201910941234 A CN201910941234 A CN 201910941234A CN 110653714 B CN110653714 B CN 110653714B
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- fixedly connected
- musical instrument
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- drumhead
- polishing
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- 238000005498 polishing Methods 0.000 title claims abstract description 52
- 230000001105 regulatory effect Effects 0.000 title claims description 7
- 239000002184 metal Substances 0.000 claims abstract description 13
- 230000008859 change Effects 0.000 claims abstract description 4
- 238000006073 displacement reaction Methods 0.000 claims abstract description 4
- 241000208967 Polygala cruciata Species 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 abstract description 9
- 238000009530 blood pressure measurement Methods 0.000 description 7
- 230000007246 mechanism Effects 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008451 emotion Effects 0.000 description 1
- 210000003128 head Anatomy 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 210000003454 tympanic membrane Anatomy 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- B24B29/00—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents
- B24B29/02—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents designed for particular 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
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
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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
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The invention relates to the technical field of musical instrument drum polishing equipment, and discloses an automatic drum surface polishing adjusting device for a musical instrument, which comprises a base, wherein the upper end of a support is connected with a walking disc, a spiral groove is formed in the walking disc, the upper end surface of the walking disc is provided with an inclined table, the upper end of the walking disc is connected with an inclined slide block, the right end of the lower part of a first sliding rod is connected with a support seat, the right end of the support seat is connected with a metal ball, and the outer side of the first sliding rod is connected with a support rod in a sliding manner. The inclined sliding block is driven to slide on the walking disc through the first sliding rod, the inclined sliding block moves upwards relative to the supporting rod, the metal ball slides on the variable resistor, the horizontal displacement of the inclined sliding block is reversely pushed through the inclination of the inclined table to determine the position of the polishing device, the length of the telescopic rod is controlled through the current change between the metal ball and the variable resistor, and the problem that the drum surface is polished unevenly due to the fact that the pressing force of the existing drum surface polishing device is fixed is solved through the structure.
Description
Technical Field
The invention relates to the technical field of musical instrument drum polishing equipment, in particular to an automatic adjusting device for polishing a drum surface of a musical instrument.
Background
The musical instruments are generally classified into national musical instruments and western musical instruments in China, and the musical instruments can play a certain temperament or rhythm by various methods. The production of musical instruments differs from the production of general industrial products in that not only are products required to have a reasonably elegant appearance, but also good acoustic qualities, including timbre, music and a specified intonation height, are required, and thus the choice of materials is very strict. The musical instrument can not only generate musical tones, but also can recreate musical art, and human beings can express and communicate thought and emotion by playing the musical instrument.
A drum is a percussion instrument that is covered with a taut membrane on one or both sides of a solid, generally cylindrical drum shell. The drum can typically be sounded by hand, pestle, etc. Most of drum surfaces are made of rubber films, plastic films and cowhides and generally need dyeing, leather stripes on the surfaces after being polished by wax-coated water are clear, the stereoscopic impression is strong, and the hand feeling is smooth, but the existing drum surface polishing device can only polish the drum surfaces from top to bottom and from left to right generally, because the drum surfaces are circular, the polishing device has too many idle strokes, and due to the deformability of tympanic membranes, the drum surfaces are different according to the distance from the drum edges, so that the pressures on two sides of the polishing device are different easily, the polishing of the drum surfaces is not uniform due to the fact that the drum surfaces are polished, the whole pressing force of the polishing device is fixed, the pressure of the drum edges is too large, the pressure in the middle of the drum is too small, the polishing of the drum surfaces is not uniform due to the fact that the drum surfaces are polished uniformly, and the.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides an automatic drum surface polishing adjusting device for a musical instrument, which has the advantages of annular polishing, automatic adjustment of drum surface pressing force and uniform polishing and solves the problems that the existing drum surface polishing device cannot perform annular polishing, the drum surface pressing force is fixed and the polishing is not uniform.
(II) technical scheme
In order to achieve the purposes of annular polishing, automatic adjustment of drum surface pressing force and uniform polishing, the invention provides the following technical scheme: an automatic regulating device for drum surface polishing of musical instruments comprises a base, wherein the lower end of the base is rotatably connected with universal wheels, the left end, the right end and the rear end of the base are fixedly connected with a support, the upper end of the support is fixedly connected with a walking disc, a spiral groove is formed in the walking disc, an annular groove is formed in the spiral groove, the upper end surface of the walking disc is provided with an inclined table, the upper end of the walking disc is slidably connected with an inclined slide block on the inclined table, the lower end of the inclined slide block is fixedly connected with a first slide rod, the lower right end of the first slide rod is fixedly connected with a support seat, the right end of the support seat is fixedly connected with a metal ball, the outer side of the first slide rod is provided with a first spring, the outer side of the first slide rod is slidably connected with a support rod, the lower end of the support rod is fixedly connected with, the left end fixedly connected with gear of first drive arrangement, the lower extreme fixedly connected with telescopic link of diaphragm, the lower extreme fixedly connected with second drive arrangement of telescopic link, second drive arrangement's lower extreme rotates and is connected with the pivot, the lower extreme fixedly connected with grinding device of pivot, the equal sliding connection of inside downside of support has the second slide bar, the outside of second slide bar is provided with the second spring, the inboard end fixedly connected with fixation clamp of second slide bar, the inboard end of fixation clamp is provided with the rubber pad, the inboard end of fixation clamp just is at the middle part fixedly connected with pressure measurement at the rubber pad.
Preferably, the universal wheel is provided with a stop caliper, so that the movement and fixation of the whole device are ensured.
Preferably, the lower end surfaces of the inclined platform and the inclined sliding block are provided with adaptive inclined angles, so that the inclined sliding block is ensured to slide in the upper end of the walking disc.
Preferably, the supporting rod slides in the annular groove, and two ends of the supporting rod are provided with supporting arms corresponding to the annular groove, so that the supporting of the related structure of the polishing device is ensured.
Preferably, the lower surface of the walking disc is provided with spiral teeth corresponding to the gear, so that the movement of the related structure of the polishing device is ensured.
Preferably, the shape of the grinding device is a trapezoid with arc edges, so that drum surface deformation and abrasion on two sides of the grinding device are reduced.
Preferably, the through hole corresponding to the second sliding rod is formed in the lower side of the inner portion of the support, and therefore the second sliding rod is guaranteed to fix the instrument drum to be polished.
Preferably, the fixing clamp is arc-shaped and is adapted to the arc surface of the drum to be polished, and the mechanism increases the contact area between the clamping mechanism and the side surface of the musical instrument drum to be polished, so that the stability of fixing the musical instrument drum to be polished is ensured.
(III) advantageous effects
Compared with the prior art, the invention provides an automatic drum surface polishing adjusting device for a musical instrument, which has the following beneficial effects:
1. this drumhead polishing automatic regulating apparatus of musical instrument, place on the base through treating polishing musical instrument drum, second slide bar through on the three support, second spring and fixation clamp are fixed to it, and simultaneously, pressure measurement on the fixation clamp, three curved fixation clamp has guaranteed to treat polishing musical instrument drum's fixed, pressure measurement can confirm whether to treat polishing musical instrument drum is under the walking dish, when three pressure measurement's numerical value is close, it is located the walking dish under to show to treat polishing musical instrument drum, vice versa, this structure has reached the accurate positioning of treating polishing musical instrument drum, thereby the homogeneity of pressing to the drumhead of follow-up dynamics of polishing has been guaranteed.
2. This drumhead polishing automatic regulating apparatus of musical instrument drives gear revolve through first drive arrangement, and the gear sets up the spiral tooth that corresponds with it through walking dish lower extreme to drive the bracing piece and remove in the helicla flute, this structure has reached the annular of treating polishing musical instrument drum and has polished.
3. The drum surface polishing automatic adjusting device of the musical instrument drives a first sliding rod through a supporting rod, the first sliding rod drives an inclined sliding block to slide on a walking disc, because the inclined platform is arranged on the walking disk, when the walking disk moves, the inclined slide block moves upwards relative to the supporting rod, at the moment, the metal ball on the first sliding rod slides on the variable resistor, this configuration further determines the position of the sharpening device by countering the horizontal displacement of the tilting slide by the inclination of the tilting table, inclination = relation between vertical height/horizontal length, the length of the telescopic rod is changed through the current change between the metal ball and the variable resistor, the structure further adjusts the pressure between the grinding device and the drumhead of the musical instrument to be polished, thereby solved current drum face burnishing device drum face pressing force fixed invariably lead to the different problem of the thickness of polishing to the drum face position.
Drawings
FIG. 1 is a schematic view of the overall front structure of the present invention;
FIG. 2 is a front sectional view of the walking plate of the present invention;
FIG. 3 is an enlarged view of the structure of FIG. 2 at A according to the present invention;
FIG. 4 is a schematic view of the overall top view of the present invention;
fig. 5 is a sectional view of the top structure of the fixing clip of the present invention.
In the figure: the device comprises a base 1, universal wheels 2, a support 3, a traveling disc 4, a spiral groove 401, an annular groove 402, a tilting table 403, a tilting slider 5, a first sliding rod 6, a support seat 601, a metal ball 602, a first spring 7, a supporting rod 8, a variable resistor 801, a transverse plate 9, a first driving device 10, a gear 11, a telescopic rod 12, a second driving device 13, a rotating shaft 14, a polishing device 15, a second sliding rod 16, a second spring 17, a fixing clamp 18, a rubber pad 1801 and a pressure detection device 19.
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. 1-5, an automatic drum surface polishing adjusting device for a musical instrument comprises a base 1, wherein a universal wheel 2 is rotatably connected to the lower end of the base 1, and the universal wheel 2 is provided with a locking caliper, so that the movement and fixation of the whole device are guaranteed. Base 1's the equal fixedly connected with support 3 in left and right ends and rear end, the upper end fixedly connected with walking dish 4 of support 3, spiral groove 401 has been seted up to the inside of walking dish 4, the ring channel 402 has been seted up to the inside of walking dish 4 and in the inside of spiral groove 401, the tilter 403 has been seted up to the up end of walking dish 4, the upper end of walking dish 4 and sliding connection have slope slider 5 on tilter 403, the lower terminal surface of tilter 403 and slope slider 5 has the inclination that suits, thereby guarantee that slope slider 5 slides in walking dish 4 upper end. The lower extreme fixedly connected with first slide bar 6 of slope slider 5, the lower part right-hand member fixedly connected with support seat 601 of first slide bar 6, the right-hand member fixedly connected with metal ball 602 of support seat 601, the outside of first slide bar 6 is provided with first spring 7, the outside sliding connection of first slide bar 6 has bracing piece 8.
The lower end of the supporting rod 8 is fixedly connected with a transverse plate 9, the upper side of the left end of the transverse plate 9 is fixedly connected with a first driving device 10, the left end of the first driving device 10 is fixedly connected with a gear 11, the lower end of the transverse plate 9 is fixedly connected with a telescopic rod 12, the lower end of the telescopic rod 12 is fixedly connected with a second driving device 13, the lower end of the second driving device 13 is rotatably connected with a rotating shaft 14, the lower end of the rotating shaft 14 is fixedly connected with a grinding device 15, the supporting rod 8 slides in the annular groove 402, and two ends of the supporting rod are provided with supporting, thereby ensuring the support of the relevant structure of the grinding device 15, the lower surface of the walking disc 4 is provided with spiral teeth corresponding to the gear 11, thereby ensuring the movement of the relative structure of the grinding device 15, and the grinding device 15 is in a trapezoidal shape with an arc edge, thereby reducing the deformation of the drum surface and the abrasion of the two sides of the grinding device 15. The equal sliding connection of inside downside of support 3 has second slide bar 16, and the through-hole corresponding with second slide bar 16 has been seted up to the inside downside of support 3 to guarantee that second slide bar 16 treats the fixed of polishing the musical instrument drum. The outside of second slide bar 16 is provided with second spring 17, and the inboard end fixedly connected with fixation clamp 18 of second slide bar 16, and the inboard end of fixation clamp 18 is provided with rubber pad 1801, and the shape of fixation clamp 18 is the arc, and suits with the cambered surface of treating the polishing drum, and this mechanism has increased fixture and has treated the area of contact of polishing the musical instrument drum side to guarantee to treat that the musical instrument drum of polishing is fixed stability. A pressure detection device 19 is fixedly connected to the inner end of the fixing clip 18 and the middle of the rubber pad 1801.
The working principle is as follows: this drumhead polishing automatic regulating apparatus of musical instrument, at the during operation, through will treating to polish the musical instrument drum and place on base 1, through second slide bar 16 on three support 3, second spring 17 and fixation clamp 18 are fixed to it, simultaneously, pressure measurement 19 on the fixation clamp 18, three curved fixation clamp 18 have guaranteed to treat polishing the fixed of musical instrument drum, pressure measurement 19 can confirm whether treating to polish the musical instrument drum and be in under walking dish 4, when three pressure measurement 19's numerical value is similar, it is in under walking dish 4 to show to treat polishing the musical instrument drum, on the contrary, this structure has reached the accurate positioning of treating to polish the musical instrument drum, thereby the homogeneity of pressing to the drumhead of follow-up dynamics of polishing has been guaranteed. The gear 11 is driven to rotate by the first driving device 10, the gear 11 sets a spiral tooth corresponding to the lower end of the walking disc 4 through the lower end of the walking disc 4, so as to drive the support rod 8 to move in the spiral groove 401, the structure achieves the annular grinding of the musical instrument drum to be polished, the support rod 8 drives the inclined slide block 5 to slide on the walking disc 4 through the first sliding rod, due to the inclined table 403 arranged on the walking disc 4, when the inclined slide block 5 moves on the walking disc 4, the inclined slide block 5 moves upwards relative to the support rod 8, at the moment, the metal ball 602 on the first sliding rod 6 slides on the variable resistor 801, the structure reversely pushes the horizontal displacement of the inclined slide block 5 through the inclination of the inclined table 403, the inclination = the relation between the vertical height and the horizontal length, the position of the grinding device 15 is further determined, and the length of the telescopic rod 12 is changed through the current change between the metal ball 602 and the variable resistor 801, the pressure between the polishing device 15 and the drum surface of the musical instrument to be polished is further adjusted by the structure, so that the problem that the polishing thickness of the drum surface is different due to the fact that the drum surface pressing force of the existing drum surface polishing device is fixed and unchanged is solved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a drumhead polishing automatic regulating apparatus of musical instrument, includes base (1), its characterized in that: the lower end of the base (1) is rotatably connected with a universal wheel (2), the left end, the right end and the rear end of the base (1) are fixedly connected with a support (3), the upper end of the support (3) is fixedly connected with a walking disc (4), a spiral groove (401) is formed in the walking disc (4), an annular groove (402) is formed in the walking disc (4) and in the spiral groove (401), the upper end face of the walking disc (4) is provided with a tilting table (403), the upper end of the walking disc (4) is connected with a tilting slider (5) in a sliding manner on the tilting table (403), the lower end of the tilting slider (5) is fixedly connected with a first sliding rod (6), the lower part of the first right sliding rod (6) is fixedly connected with a support seat (601), the right end of the support seat (601) is fixedly connected with a metal ball (602), and the outer side of the first sliding rod (6), the outer side of the first sliding rod (6) is connected with a supporting rod (8) in a sliding manner, the lower end of the supporting rod (8) is fixedly connected with a transverse plate (9), the upper side of the left end of the transverse plate (9) is fixedly connected with a first driving device (10), the left end of the first driving device (10) is fixedly connected with a gear (11), the lower end of the transverse plate (9) is fixedly connected with a telescopic rod (12), the lower end of the telescopic rod (12) is fixedly connected with a second driving device (13), the lower end of the second driving device (13) is rotatably connected with a rotating shaft (14), the lower end of the rotating shaft (14) is fixedly connected with a grinding device (15), the lower side of the inner part of the bracket (3) is respectively connected with a second sliding rod (16) in a sliding manner, a second spring (17) is arranged on the outer side of the second sliding rod (16), a fixing clamp (18) is fixedly connected with, a pressure detection device (19) is fixedly connected to the inner side end of the fixing clamp (18) and the middle part of the rubber pad (1801);
-the metal ball (602) slides on the variable resistance (801) to reverse the horizontal displacement of the tilting slide (5) by the inclination of the tilting table (403), inclination = relation between vertical height/horizontal length, to determine the position of the grinding device (15); the length of the telescopic rod (12) is changed through the current change between the metal ball (602) and the variable resistor (801), so that the pressure between the grinding device (15) and the drumhead of the musical instrument to be polished is adjusted.
2. The drumhead buffing automatic adjusting device of musical instrument according to claim 1, characterized in that: the universal wheel (2) is provided with a stop caliper.
3. The drumhead buffing automatic adjusting device of musical instrument according to claim 1, characterized in that: the lower end surfaces of the inclined platform (403) and the inclined slide block (5) are provided with corresponding inclined angles.
4. The drumhead buffing automatic adjusting device of musical instrument according to claim 1, characterized in that: the supporting rod (8) slides in the annular groove (402), and two ends of the supporting rod are provided with supporting arms corresponding to the annular groove (402).
5. The drumhead buffing automatic adjusting device of musical instrument according to claim 1, characterized in that: the lower surface of the walking disc (4) is provided with spiral teeth corresponding to the gear (11).
6. The drumhead buffing automatic adjusting device of musical instrument according to claim 1, characterized in that: the polishing device (15) is in a trapezoid shape with an arc-shaped edge.
7. The drumhead buffing automatic adjusting device of musical instrument according to claim 1, characterized in that: and a through hole corresponding to the second sliding rod (16) is formed in the lower side of the inner part of the bracket (3).
8. The drumhead buffing automatic adjusting device of musical instrument according to claim 1, characterized in that: the fixing clamp (18) is arc-shaped and is adapted to the arc surface of the drum to be polished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910941234.9A CN110653714B (en) | 2019-09-30 | 2019-09-30 | Drum head polishing automatic regulating device of musical instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910941234.9A CN110653714B (en) | 2019-09-30 | 2019-09-30 | Drum head polishing automatic regulating device of musical instrument |
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| CN110653714A CN110653714A (en) | 2020-01-07 |
| CN110653714B true CN110653714B (en) | 2020-11-06 |
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| CN201910941234.9A Active CN110653714B (en) | 2019-09-30 | 2019-09-30 | Drum head polishing automatic regulating device of musical instrument |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111975592B (en) * | 2020-07-25 | 2021-08-10 | 翰贝摩尔表面技术（江苏）有限公司 | Environment-friendly metal material surface treatment device |
| CN112059823B (en) * | 2020-09-16 | 2021-09-03 | 池州市芯村里新材料科技有限公司 | Accurate grinding device in environment-friendly metal material surface |
| CN113059357B (en) * | 2021-05-13 | 2022-04-15 | 青岛昌辉管业有限公司 | Large elbow opening rounding equipment |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3700442A1 (en) * | 1987-01-09 | 1988-07-21 | Fortuna Werke Maschf Ag | METHOD FOR REMOVING MATERIALS FROM WORKPIECE BLanks FOR THE PRODUCTION OF SPIRAL COMPRESSOR BLADES |
| CN204339555U (en) * | 2014-12-05 | 2015-05-20 | 黄山菲英汽车零部件有限公司 | Rouse sheet sanding apparatus of stopping |
| CN205673984U (en) * | 2016-06-17 | 2016-11-09 | 大同新成新材料股份有限公司 | Outer arc milling drum in pantograph carbon slide |
| CN108188847A (en) * | 2017-12-28 | 2018-06-22 | 宁波高新区神台德机械设备有限公司 | A kind of metal surface abrasive dust device |
| CN208880434U (en) * | 2018-04-04 | 2019-05-21 | 昆山市欧凡达精密汽车零件有限公司 | A kind of snail disk burnishing device |
| CN108326689A (en) * | 2018-05-02 | 2018-07-27 | 郑余龙 | A kind of drum-type brake pad outer arc grinding machine |
| CN208629169U (en) * | 2018-06-01 | 2019-03-22 | 无锡鸿祥热导科技股份有限公司 | Fin-inserted radiator processes workpiece polishing mechanism |
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Effective date of registration: 20201014 Address after: PI Zhuang Zhen Lei Cao Cun, Taierzhuang District, Zaozhuang City, Shandong Province Applicant after: Zaozhuang JieChuang Abrasives Co., Ltd Address before: 311100 room 717-2, building 7, Xixi letiancheng, Wuchang Street, Yuhang District, Hangzhou City, Zhejiang Province Applicant before: Hangzhou xiaoku Trading Co.,Ltd. |
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