CN102615570A - Stepless dividing device and camshaft grinder comprising same - Google Patents
Stepless dividing device and camshaft grinder comprising same Download PDFInfo
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- CN102615570A CN102615570A CN2012100497227A CN201210049722A CN102615570A CN 102615570 A CN102615570 A CN 102615570A CN 2012100497227 A CN2012100497227 A CN 2012100497227A CN 201210049722 A CN201210049722 A CN 201210049722A CN 102615570 A CN102615570 A CN 102615570A
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Abstract
The invention provides a stepless dividing device and a camshaft grinder comprising the same. The stepless dividing device comprises a servo motor (2), a hollow spindle (7) arranged between two bearing seats (6 and 10), a cam sample plate (9) fixedly connected onto the hollow spindle (7) and a dividing driving plate (12) movably sleeved on the head portion of the hollow spindle (7). The stepless dividing device is characterized in that a pulling tight set device for driving the hollow spindle (7) to be connected or disconnected with the dividing driving plate (12) is arranged in an inner hole of the hollow spindle (7), a pipe bending cylinder (4) for pushing the pulling tight set device (3) is sleeved on the tail portion of the hollow spindle (7), and a disc braking device for locking the dividing driving plate (12) is further arranged outside the dividing driving plate (12). The dividing driving plate (12) has the advantages of being simple in structure, easy to manufacture, capable of dividing at any angle, fast in dividing and high in accuracy.
Description
Technical field
The present invention relates to the metal-working plant field, especially, relate to a kind of stepless indexing means, comprise servomotor, be installed on the hollow shaft between the diaxon bearing, be cemented in cam template and kink on the hollow spindle at the calibration dial of hollow spindle head.In addition, the invention still further relates to a kind of camshaft grinding machine that comprises this stepless indexing means.
Background technology
Camshaft is one of vital part of automobile engine, and its quality quality, machining accuracy height directly have influence on the discharging of engine, energy-conservation and service life.
In the prior art; The still widely-used direct copy camshaft grinding machine profile copy grinding camshaft part of most of cam manufacturing enterprise, the precision of the cam contour of camshaft directly receives the influence of the camshaft model accuracy of manufacture, and the cam of the cam template of grinding machine and institute's converted products is one to one; That is to say; On the product several cams are arranged, will be useful on the lathe anti-model that leans on method to process several equal numbers, the fixed dividing head of general employing on the direct copy camshaft grinding machine in the industry; Its dial and index dial adopt screw to carry out mechanical connection; After this method is accomplished clamping of camshaft, every processing a slice camshaft, the camshaft workpiece can not rotate a phase angle with respect to contour plate; On the camshaft workpiece several cams are arranged, will process several contour plates accordingly on the lathe pattern main shaft.Simultaneously, the difficulty of processing of machining cam contour plate is big, and efficient is low, and the model uniformity is poor, and the molded lines uniformity of processing back product is also poor, is difficult to guarantee the uniformity of the outer meter accuracy of each cam.
For addressing this problem; Chinese invention patent number is 200610031255.X; Disclose a kind of automatic dividing attachment that is used for camshaft grinding machine, this device comprises hollow shaft, and the first face gear sky is enclosed within on the hollow shaft; This face gear periphery is provided with locating slot, and first face gear, one side is provided with the alignment pin of turnover locating slot; Second face gear is installed on the hollow shaft with hollow shaft and rotates and can endwisely slip in the hollow shaft upper edge; The flank of tooth of its face gear can with the flank engagement of first face gear, between second face gear and hollow shaft, be provided with and drive the drive unit that second face gear is in axial sliding.During calibration; The locating slot that alignment pin inserts the first end face tooth is fixed; Drive the second end face tooth through drive unit and separate with the first end face tooth, the servomotor through the control system rotates the angle that hollow spindle needs to cam again, and drive unit combines the first and second end face teeth then; Unclamp alignment pin at last, accomplish the calibration of cam.This device preferably resolves above-mentioned technical problem, promptly adopts a pattern, just the identical cam of different angles on the ability machining cam axle.But, because this device adopts gear to carry out the calibration location, adopt the groove latch structure to lock, still exist following not enough:
(1), the gear compound graduation location structure is complicated, and the Gear Processing required precision is high, makes difficulty, cost is high.
(2) end-toothed disc is made up of 48 five equilibrium end teeth, so calibration can only divide by the multiple of 7.5 ° of sub-multiple angles, belongs to " limited calibration ", and calibration has the minimum angles restriction, can't realize calibration at any angle, influences indexing accuracy.
(3) the calibration dial adopts groove pin formula locking mechanism, because the restricted number of groove can not lock the optional position, lock speed is slow, and efficient is low, easy error.And the big problem of latched position error also can be caused in the intrinsic gap of groove pin formula locking mechanism, directly influences the spindle index precision.
Summary of the invention
The object of the invention is to provide a kind of stepless indexing means, with solve the cost that indexing means exists in the prior art high, can not arbitrarily angled calibration location and locking, the slow-footed technical problem of calibration.
For realizing above-mentioned purpose; According to an aspect of the present invention; A kind of stepless indexing means is provided, has comprised servomotor, be installed on the hollow spindle between the diaxon bearing, be cemented in cam template and kink on the hollow spindle at the calibration dial of hollow spindle head; Its design feature is, is equipped with in the endoporus of hollow spindle to drive that hollow spindle combines with the calibration dial or the tensioner of drawing of separating is decided device; Being set with pushing tow at the afterbody of hollow spindle draws tensioner to decide the pipe bending cylinder of device; The calibration dial outside also is provided with the disc brake apparatus of locking calibration dial.
Further, the endoporus place of hollow spindle head is provided with boss with holes; The head of hollow spindle circumferentially is evenly equipped with outward more than two and the perpendicular installing hole of the axis of hollow spindle.
Further, drawing tensioner to decide device comprises: be contained in the pull bar in the boss with holes; The head of pull bar is provided with the conical plug of back taper, and afterbody is provided with screw thread and screws the nut of screw thread; Elastic parts is set between pull bar and the hollow spindle, and front end is connected to the step of the endoporus boss with holes of hollow spindle, and the rear end is regulated with adjusting nut locking; Several zygotes are slidingly mounted in the installing hole that the head of hollow spindle circumferentially is uniformly distributed with; Head butt to the calibration dial internal face of zygote, the conical surface of afterbody butt to conical plug.
Further, elastic parts is butterfly spring, helical spring or elastic caoutchouc circle; Zygote is cylinder or steel ball.
Further, pipe bending cylinder is an one-way cylinder, comprising: piston reaches the piston rod with said piston one; The tail end of end butt to the pull bar of piston rod; And, be installed on the ring joint at pipe bending cylinder oil-in place.
Further, the calibration dial also comprises a circular braking surface.
Further, disc brake apparatus is a single-acting cylinder, comprising: the disc brake oil cylinder; And the damper brake that is connected in the piston rod head of disc brake oil cylinder.
Further, the calibration dial also comprises a circular braking surface, and damper brake has the corresponding arcuate friction surface of circular braking surface with the calibration dial.
Further, the arcuate friction surface of damper brake is made up of friction material.
According to a further aspect in the invention, a kind of camshaft grinding machine is provided also, it comprises the stepless indexing means of technique scheme.
The present invention has following beneficial effect:
(1), owing to draw tensioner decide device to comprise pull bar, elastic parts and zygote, no profile of tooth connection, simple in structure, easy to manufacture, cheap.
(2), since draw mode two ends that zygote that tensioner decide device contacts through rigidity respectively butt pull bar inverted cone surface and calibration dial internal face come clutch hollow spindle and calibration dial, required actuating length is minimum, thereby significantly improves calibration speed.
(3), owing to adopted no tooth-like clutch to connect, can realize the arbitrarily angled calibration of hollow spindle, and not have minimum angles to limit; Thereby raising indexing accuracy; Satisfy the processing of all the angle camshafts in 360 ° of scopes, widened the apparatus processing scope, improved utilization rate of equipment and installations.
(4), owing to adopt disc brake apparatus, can lock the calibration dial in any angular position, realizes that no gap locks, the assurance indexing accuracy.
Except top described purpose, feature and advantage, the present invention also has other purpose, feature and advantage.To do further detailed explanation to the present invention with reference to figure below.
Description of drawings
The accompanying drawing that constitutes the application's a part is used to provide further understanding of the present invention, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of the stepless indexing means of camshaft grinding machine of the preferred embodiment of the present invention;
Symbol description: synchronously band-1, servomotor-2, draw tensioner decide device-3, pipe bending cylinder-4, belt wheel-5, rear bearing block-6, hollow spindle-7, long key-8, cam template-9, front-end bearing pedestal-10, zygote-11, calibration dial-12, finger-13, thimble-14, damper brake-16, disc brake oil cylinder-17, guide wheel-18, emery wheel-19, workpiece-20, small pulley-21, support set-31, pull bar-32, elastic parts-33, kink-34, adjusting nut-35, conical plug-36, lead-37, the elongated body of rod-38, ring joint-41 greatly; Piston-42, oil cylinder body-43, return spring-44, piston rod-45, boss-71.
The specific embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
Referring to Fig. 1; The stepless indexing means of the preferred embodiment of the present invention comprises and is with 1 synchronously, servomotor 2, draws tensioner to decide device 3, pipe bending cylinder 4, big belt wheel 5, rear bearing block 6, hollow spindle 7, long key 8, cam template 9, front-end bearing pedestal 10, zygote 11 and calibration dial 12.
The two ends of hollow spindle 7 are separately installed with front-end bearing pedestal 10 and rear bearing block 6, at forward and backward bearing block 10, be installed with the linear cam template of some differences 9 through a long key 8 between 6.End at front-end bearing pedestal 10; Promptly be provided with boss 71 with holes at the endoporus place of the head of hollow spindle 7; To being evenly equipped with more than two and the perpendicular installing hole of hollow spindle 7 axis, be slidingly fitted with corresponding cylindrical zygote 11 at the cylindrical of the head of hollow spindle 7 in this installing hole.Present embodiment adopts two installing holes and two zygotes.Calibration dial 12 movable sets are at the head of hollow spindle and be positioned at above the zygote 11, and this calibration dial 12 has a concentric columniform braking surface and is cemented in a distolateral finger 13.At an end of rear bearing block 6, promptly at the afterbody of hollow spindle 7, key is connected with a synchronously big belt wheel 5.The above-mentioned interior zygote 11 of installing hole that is installed in hollow spindle 7 can also adopt other shape, such as adopting steel ball as zygote, also can reach effect same.
Draw tensioner to decide in the endoporus that device 3 is installed on hollow spindle 7.Drawing tensioner to decide device 3 is made up of pull bar 32, elastic parts 33, support set 31 and kink 34.Preferably, in this embodiment, elastic parts 33 is a disk spring.Wherein, The head of pull bar 32 is processed with the conical plug 36 of back taper and connects the lead 37 of conical plug 36; The middle part is an elongated body of rod 38, and this elongated body of rod 38 penetrates from the head of hollow spindle 7, through boss 71 with holes; The face of cylinder of the lead 37 on its pull bar 32 can be slidingly matched in the endoporus of corresponding hollow spindle 7, for pull bar 32 forward and backward moving longitudinally play the guiding role.Priority movable set support set 31 between the endoporus of the elongated body of rod 38 and hollow spindle 7; Elastic parts 33 and kink 34; Because the endoporus of hollow spindle 7 is provided with the boss with holes 71 of outstanding bore area; The end face butt of support set 31 is to this boss 71 sidewalls with holes, and screw thread of processing through pull bar 32 afterbodys during installation and the adjusting nut 35 that screws this screw thread compress elastic parts 33.Obviously, this structure can be adjusted the compression degree of elastic parts 33 through the precession of adjusting nut 35 with back-out, thereby adjusts the thrust of pull bar 32.The back taper plug 36 of its head was positioned at the position of the installing hole of hollow spindle 7 when pull bar 32 was installed; The internal face of head butt to the calibration dial 12 of the cylindrical zygote 11 in the aforementioned installing hole that is installed in hollow spindle 7, the conical surface of the conical plug 36 of afterbody butt to back taper.The present embodiment elastic parts preferably adopts butterfly spring, certainly, also can adopt helical spring or elastic caoutchouc circle in a further embodiment.
Being connected with pushing tow at the afterbody of hollow spindle 7 draws tensioner to decide the pipe bending cylinder 4 of device 3.Pipe bending cylinder 4 is one-way cylinders, comprising: be provided with the swivel joint 41 into and out of oil duct, piston 42, piston rod 45, oil cylinder body 43 and return spring 44.Oil cylinder body 43 is threaded in the afterbody of hollow spindle 7, and piston rod 45 is processed into one with piston 42, with simplified structure.The tail end of end butt to the pull bar 32 of piston rod 45.
Be positioned at the disc brake apparatus that calibration dial 12 1 sides also are provided with this calibration dial 12 of braking.Disc brake apparatus comprises: disc brake oil cylinder 17, and the damper brake 16 that is connected in the piston rod head of disc brake oil cylinder 17.Damper brake 16 has the corresponding arcuate friction surface of circular braking surface with calibration dial 12.The arcuate friction surface of damper brake 16 is made up of known friction material.
In addition, the present invention also comprises a kind of camshaft grinding machine, and it comprises the stepless indexing means that the front is described.
During work, mounting flange formula thimble 14, clamping camshaft workpiece 20 and finger 13; Start servomotor 2; The small pulley 21 that is connected on servomotor 2 output shafts drives big belt wheel 5 rotations through synchronous belt 1, and the pipe bending cylinder 4, cam template 9 and the calibration dial 12 that drive hollow spindle 7 simultaneously, connect on it rotate the reel cage that falls down (figure does not show); Guide wheel 18 contact cam templates 9 move nearly emery wheel 19 beginning profile copy grindings linear by the cam template 9 of guide wheel 18 butts.After treating that this sheet cam machines, when main shaft needed calibration: reel cage was put, and cam template 9 breaks away from guide wheel 18.17 actions of disc brake oil cylinder are checked calibration dial 12 by damper brake 16.Pipe bending cylinder 4 actions; Move to right elasticity of compression assembly 33, conical plug 36 of piston rod 45 pushing tow pull bars 32 moves right; Support is risen and is lost pressure in the zygote 11 of calibration dial 12 inner hole walls, and hollow spindle 7 unclamps with calibration dial 12, at this moment; Servomotor 2 through synchronously with 1 drive hollow spindle 7 follow procedures instruction rotate a minute of angle (be cam template 9 with respect to calibration dial 12 or finger 13 or workpiece 20, rotate a minute of angle).Afterwards; Pipe bending cylinder 4 oil returns action; Return spring 44 and elastic parts 33 acting in conjunction lower pistons 42 backward (left-hand among the figure) return; Effect inferior pyramidal plug 36 at elastic parts 33 moves backward, and at this moment, conical plug 36 applies bulbs of pressure support tightly calibration dial 12 inner hole walls (hollow spindle 7 was accomplished with dial 12 and combined to move this moment) that rise for zygote 11; Disc brake oil cylinder 17 oil returns action, damper brake 16 unclamps, and calibration dial 12 brake offs have just been accomplished the calibration program this moment.
Again reel cage is fallen down forward, make cam template 9 and guide wheel 18 close up, begin again to carry out the automatic profiling grinding by the shape line of cam template 9 and the phase angle behind the calibration.Every completion to a cam ground after, repeat above-mentioned action, until having ground last cam.
For the different linear cams of grinding on a grinding machine; To enlarge the range of work, improve utilization rate of equipment and installations, can the linear cam template 9 of the some differences of suit on hollow spindle; When needs are processed a certain linear cam, as long as guide wheel 18 is abutted against this cam template 9.
Can find out that from the description of front comprise pull bar 32, elastic parts 33 and zygote 11 owing to draw tensioner to decide device 3, no profile of tooth connects, and is simple in structure, easy to manufacture, cheap.Since draw zygote 11 that the tensioner decide device 3 mode two ends through the rigidity contact respectively butt pull bar 32 inverted cone surfaces and calibration dial 12 internal faces come clutch hollow spindle 7 and calibration dial 12, required actuating length is minimum, thereby significantly improves calibration speed.Owing to adopted no tooth-like clutch to connect, can realize the arbitrarily angled calibration of hollow spindle, and not have the minimum angles restriction; Thereby raising indexing accuracy; Satisfy the processing of all the angle camshafts in 360 ° of scopes, widened the apparatus processing scope, improved utilization rate of equipment and installations.Owing to adopt disc brake apparatus, can lock calibration dial 12 in any angular position, realize the locking of no gap, guarantee indexing accuracy.Thus, the present invention can be widely used in camshaft grinding machine.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. stepless indexing means; It is characterized in that the hollow spindle (7) that comprise servomotor (2), is installed on the diaxon bearing between (6,10) is cemented in cam template (9) and kink on the said hollow spindle (7) at the calibration dial (12) of hollow spindle (7) head; Wherein
Be equipped with in the endoporus of said hollow spindle (7) and drive that said hollow spindle (7) engages with said calibration dial (12) or the tensioner of drawing of separating is decided device (3);
Afterbody at said hollow spindle (7) is set with the said pipe bending cylinder (4) that draws tensioner to decide device (3) of pushing tow;
Said calibration dial (12) outside also is provided with the disc brake apparatus of the said calibration dial of locking (12).
2. stepless indexing means according to claim 1 is characterized in that,
The endoporus place of said hollow spindle (7) head is provided with boss with holes (71);
The head of said hollow spindle (7) circumferentially is evenly equipped with more than two the perpendicular installing hole of axis with said hollow spindle (7) outward.
3. stepless indexing means according to claim 2 is characterized in that, saidly draws tensioner to decide device (3) to comprise:
Be contained in the pull bar (32) in the said boss with holes (71);
The head of said pull bar (32) is provided with the conical plug (36) of back taper, and afterbody is provided with screw thread and screws the nut of said screw thread (35);
Elastic parts (33) is set between said pull bar (32) and the hollow spindle (7), and front end is connected to the endoporus stage portion of said hollow spindle (7), and the rear end is regulated with said adjusting nut (35) locking;
Several zygotes (11) are slidingly mounted in the installing hole that the head of said hollow spindle (7) circumferentially is uniformly distributed with; The head butt of said zygote (11) to said calibration dial (12) internal face, the conical surface of afterbody butt to said conical plug (36).
4. stepless indexing means according to claim 3 is characterized in that,
Said elastic parts (33) is butterfly spring, helical spring or elastic caoutchouc circle;
Said zygote (11) is cylinder or steel ball.
5. stepless indexing means according to claim 1 is characterized in that, said pipe bending cylinder (4) is an one-way cylinder, comprising:
Piston (42);
With the piston rod (45) of said piston (42) one, the tail end of the end butt of said piston rod (45) to said pull bar (32); And
Be installed on the ring joint (41) at said pipe bending cylinder (4) oil-in place.
6. stepless indexing means according to claim 1 is characterized in that,
Said calibration dial (12) also comprises a circular braking surface.
7. stepless indexing means according to claim 1 is characterized in that, said disc brake apparatus is a single-acting cylinder, comprising:
Disc brake oil cylinder (17); And
Be connected in the damper brake (16) of the piston rod head of said disc brake oil cylinder (17).
8. stepless indexing means according to claim 7 is characterized in that,
Said calibration dial (12) also comprises a circular braking surface, and said damper brake (16) has the corresponding arcuate friction surface of circular braking surface with said calibration dial (12).
9. stepless indexing means according to claim 8 is characterized in that,
The arcuate friction surface of said damper brake (16) is made up of friction material.
10. a camshaft grinding machine comprises indexing means, it is characterized in that, said indexing means is according to each described stepless indexing means among the claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210049722 CN102615570B (en) | 2012-02-29 | 2012-02-29 | Stepless dividing device and camshaft grinder comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210049722 CN102615570B (en) | 2012-02-29 | 2012-02-29 | Stepless dividing device and camshaft grinder comprising same |
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| CN102615570A true CN102615570A (en) | 2012-08-01 |
| CN102615570B CN102615570B (en) | 2013-12-18 |
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| CN 201210049722 Active CN102615570B (en) | 2012-02-29 | 2012-02-29 | Stepless dividing device and camshaft grinder comprising same |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104526555A (en) * | 2015-01-30 | 2015-04-22 | 重庆市银钢一通科技有限公司 | Grinding clamp |
| CN111546142A (en) * | 2020-06-10 | 2020-08-18 | 杭州加淼科技有限公司 | Ferrule type joint manufacturing and processing technology |
| CN111633515A (en) * | 2020-06-10 | 2020-09-08 | 杭州加淼科技有限公司 | Stainless steel cutting ferrule formula connects manufacturing automation processing system |
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| CN104526555A (en) * | 2015-01-30 | 2015-04-22 | 重庆市银钢一通科技有限公司 | Grinding clamp |
| CN111546142A (en) * | 2020-06-10 | 2020-08-18 | 杭州加淼科技有限公司 | Ferrule type joint manufacturing and processing technology |
| CN111633515A (en) * | 2020-06-10 | 2020-09-08 | 杭州加淼科技有限公司 | Stainless steel cutting ferrule formula connects manufacturing automation processing system |
| CN111546142B (en) * | 2020-06-10 | 2021-06-11 | 浙江飞挺机械股份有限公司 | Ferrule type joint manufacturing and processing technology |
| CN111633515B (en) * | 2020-06-10 | 2021-06-15 | 杭州加淼科技有限公司 | Stainless steel cutting ferrule formula connects manufacturing automation processing system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102615570B (en) | 2013-12-18 |
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Inventor after: Huang Taoyi Inventor after: Su Tao Inventor after: Peng Jinglin Inventor after: Wu Jinwu Inventor after: Luo Lei Inventor before: Huang Taoyi Inventor before: Su Tao Inventor before: Peng Jinglin Inventor before: Ding Yongfu Inventor before: Wu Jinwu Inventor before: Shen Nailiang Inventor before: Luo Lei Inventor before: Xu Mansheng Inventor before: Peng Gangping |
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Free format text: CORRECT: INVENTOR; FROM: HUANG TAOYI SU TAO PENG JINGLIN DING YONGFU WU JINWU SHEN NAILIANG LUO LEI XU MANSHENG PENG GANGPING TO: HUANG TAOYI SU TAO PENG JINGLIN WU JINWU LUO LEI |
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| ASS | Succession or assignment of patent right |
Owner name: HUANG JUNHAO Free format text: FORMER OWNER: HUNAN HUDA RUILAI ELECTROMECHANICAL CO., LTD. Effective date: 20130929 Owner name: HUNAN HUDA RUILAI ELECTROMECHANICAL CO., LTD. Effective date: 20130929 |
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| C41 | Transfer of patent application or patent right or utility model | ||
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Inventor after: Huang Junhao Inventor after: Su Tao Inventor after: Peng Jinglin Inventor after: Wu Jinwu Inventor after: Luo Lei Inventor before: Huang Taoyi Inventor before: Su Tao Inventor before: Peng Jinglin Inventor before: Wu Jinwu Inventor before: Luo Lei |
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| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: HUANG TAOYI SU TAO PENG JINGLIN WU JINWU LUO LEI TO: HUANG JUNHAO SU TAO PENG JINGLIN WU JINWU LUO LEI |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20130929 Address after: 410009 No. two, section 300, South Second Ring Road, Changsha, Hunan Applicant after: Huang Junhao Applicant after: Hunan Huda Ruilai Electromechanical Co., Ltd. Address before: 410009 No. two, section 300, South Second Ring Road, Changsha, Hunan Applicant before: Hunan Huda Ruilai Electromechanical Co., Ltd. |
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| C14 | Grant of patent or utility model | ||
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Effective date of registration: 20180824 Address after: 410009 169 Yuen Hua Road, Yuhua District, Changsha, Hunan Co-patentee after: Hunan iridium CNC equipment Limited by Share Ltd Patentee after: Huang Junhao Address before: 410009 300 section two, South Second Ring Road, Changsha City, Hunan Co-patentee before: Hunan Huda Ruilai Electromechanical Co., Ltd. Patentee before: Huang Junhao |