CN112985730B - Multi-dimensional vibration test detection device for electromechanical equipment production - Google Patents
Multi-dimensional vibration test detection device for electromechanical equipment production Download PDFInfo
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- CN112985730B CN112985730B CN202110154897.3A CN202110154897A CN112985730B CN 112985730 B CN112985730 B CN 112985730B CN 202110154897 A CN202110154897 A CN 202110154897A CN 112985730 B CN112985730 B CN 112985730B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/06—Multidirectional test stands
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The utility model discloses a multi-dimensional vibration test detection device for electromechanical equipment production, relates to the technical field of detection tests, and solves the problems that an existing vibration detection test device only vibrates in one direction, when vibration tests are required to be carried out on products in different directions, the products need to be detached and then replaced for the tests, the test operation is troublesome, meanwhile, the vibration amplitude of the existing test device is difficult to adjust, and the test effect is poor; the top spherical surface of the mounting base is connected with a group of vibration test tables; the left side of the mounting base is rotatably connected with a group of tension adjusting operation pieces; the inner circumference array of the mounting base is rotationally connected with four groups of tension adjusting screws. The vibration test bench provided by the utility model can realize vibration of the vibration test bench, simulate vibration in different directions, simultaneously realize vibration amplitude adjustment and simulate vibration test under synchronous vibration amplitude, and has better test effect, and is convenient to use and simple to operate.
Description
Technical Field
The utility model relates to the technical field of detection tests, in particular to a multi-dimensional vibration test detection device for electromechanical equipment production.
Background
The electromechanical product refers to production equipment and living machines of various farm tools, such as machinery, electrical appliances and electronic equipment, which are produced by using the machinery, electrical appliances and electronic equipment, and generally comprises mechanical equipment, electrical equipment, transportation means, electronic products, electrical products, instruments, metal products and the like, parts and components thereof, and various test tests are required to be carried out on the electromechanical product in the production process of the electromechanical product, wherein the vibration test is a common test detection item, and the vibration test is required to be carried out by a vibration test device in the detection process of the vibration test.
For example, application number: the utility model discloses a vibration test bed, and relates to the technical field of vibration tests. The utility model comprises a test bed body, handles are welded on both sides of the test bed body, an operating panel is arranged at one side of the test bed body near the bottom end of the handles, a switch is arranged at one side of the operating panel, a speed regulating rotating head is arranged at one side of the operating panel near the lower end of the switch, an indicator lamp is arranged at one side of the operating panel near the switch, two supporting plates are welded on the bottom of the test bed body, two adjustable supporting legs are arranged at the bottoms of the two supporting plates, one ends of the four adjustable supporting legs are connected with an adjusting plate in an inserting mode, one end of the adjusting plate is connected with a gear through welding, the gear is connected with an adjusting rod through meshing, and the top end of the adjusting rod is connected with the supporting plate through welding. According to the utility model, through a series of designs, the device can level according to the ground flatness, and can clamp a workpiece to prevent the workpiece from falling accidentally, so that the working efficiency is greatly improved.
Based on the above, the existing vibration detection test device can vibrate in only one direction, when vibration tests are required to be carried out on different directions of products, the products are required to be detached and then the products are required to be replaced for tests, the test operation is troublesome, meanwhile, the vibration amplitude of the existing test device is difficult to adjust, and the test effect is poor; therefore, the existing requirements are not met, and a multi-dimensional vibration test detection device for the production of electromechanical equipment is provided.
Disclosure of Invention
The utility model aims to provide a multi-dimensional vibration test detection device for electromechanical equipment production, which aims to solve the problems that the conventional vibration test device provided in the background art only vibrates in one direction, when vibration tests are required to be carried out on different directions of products, the products are required to be detached and then the directions are required to be changed for tests, the test operation is troublesome, meanwhile, the vibration amplitude of the conventional test device is difficult to adjust, and the test effect is poor.
In order to achieve the above purpose, the present utility model provides the following technical solutions: a multidimensional vibration test detection device for electromechanical equipment production comprises a mounting base; the top spherical surface of the mounting base is connected with a group of vibration test tables; the left side of the mounting base is rotatably connected with a group of tension adjusting operation pieces; four groups of tension adjusting screw rods are rotationally connected with the inner circumference of the mounting base in an array arrangement manner; a group of vibration adjusting driving parts are fixedly connected to the right side of the mounting base; the upper part of the mounting base is rotatably connected with a group of vibration driving supporting pieces; the upper part of the right side of the vibration driving support piece is fixedly connected with a group of vibration driving pieces.
Preferably, the installation base further comprises a test bed installation ball head, the bottom center of the installation base is fixedly connected with a group of test bed installation ball heads, the vibration test bed further comprises a test bed installation ball socket, the top center of the vibration test bed is fixedly connected with a group of test bed installation ball sockets, and the test bed installation ball heads are in spherical fit with the test bed installation ball sockets.
Preferably, the tightening force adjusting operation piece further comprises a tightening force adjusting driving bevel gear, the right side of the tightening force adjusting operation piece is coaxially and fixedly connected with two groups of tightening force adjusting driving bevel gears, the tightening force adjusting screw rod further comprises a tightening force adjusting driven bevel gear, the inner side of the tightening force adjusting screw rod is coaxially and fixedly connected with a group of tightening force adjusting driven bevel gears, and each group of tightening force adjusting driving bevel gears is meshed with the two groups of tightening force adjusting driven bevel gears respectively to jointly form a bevel gear transmission mechanism.
Preferably, the tension adjusting screw further comprises a tension adjusting slide block, the outside thread transmission of the tension adjusting screw is connected with a group of tension adjusting slide blocks, the tension adjusting slide blocks are in sliding connection with the mounting base, and a screw nut transmission pair is formed between the tension adjusting screw and the tension adjusting slide blocks.
Preferably, the tension adjusting screw rod further comprises tension springs, a group of tension springs are hung at the top of each group of tension adjusting sliding blocks, the vibration test stand further comprises tension spring installation parts, four groups of tension spring installation parts are arranged at the circumference of the bottom of the vibration test stand in an array mode, and the other ends of the tension springs are respectively hung with one group of tension spring installation parts.
Preferably, the vibration adjusting driving piece further comprises a vibration adjusting driving bevel gear, a group of vibration adjusting driving bevel gears are coaxially and fixedly connected to a rotating shaft of the vibration adjusting driving piece, the vibration driving supporting piece further comprises a vibration adjusting driven bevel gear ring, a group of vibration adjusting driven bevel gear rings are coaxially and fixedly connected to the bottom of the vibration driving supporting piece, and the vibration adjusting driving bevel gears and the vibration adjusting driven bevel gear rings are meshed to form a bevel gear transmission mechanism together.
Preferably, the vibration driving piece further comprises a vibration driving cam, a group of vibration driving cams are fixedly connected to the rotating shaft of the vibration driving piece, the tops of the vibration driving cams are in contact with the vibration test bed, and a cam mechanism is jointly formed between the vibration driving cams and the vibration test bed.
Compared with the prior art, the utility model has the beneficial effects that:
according to the vibration test bed, the ball head is mounted on the test bed, the ball surface of the ball socket is mounted on the test bed, the ball head is matched with the ball surface of the mounting base, and the vibration test bed and the mounting base are tensioned through four groups of tension springs.
When the vibration test bench is used, the tension adjusting operation piece is rotated, the tension adjusting operation piece drives the four groups of tension adjusting screws to synchronously rotate through a bevel gear transmission mechanism formed by meshing the tension adjusting driving bevel gear and the tension adjusting driven bevel gear, the tension adjusting screws drive the tension adjusting slide blocks to slide through a screw nut transmission pair formed by the tension adjusting screws and the tension adjusting slide blocks, the tension adjusting slide blocks change the tensioning lengths of the four groups of tension springs, and the adjustment of the tension of the vibration test bench is realized, so that the vibration amplitude is adjusted.
In the test, when the vibration adjusting driving piece rotates, the vibration adjusting driving piece is meshed with the vibration adjusting driven bevel gear to jointly form a bevel gear transmission mechanism to drive the vibration driving supporting piece to rotate, and the vibration driving supporting piece rotates to change the vibration direction so as to simulate vibration in different directions; the vibration driving piece drives the vibration test bed to vibrate through a cam mechanism formed between the vibration driving cam and the vibration test bed, and vibration of the vibration test bed is realized on a workpiece.
The vibration test bench provided by the utility model can realize vibration of the vibration test bench, simultaneously realize the change of vibration directions by driving the support piece to rotate through vibration, simulate vibration in different directions, and simultaneously realize the adjustment of the tensioning force of the vibration test bench, thereby adjusting the vibration amplitude, simulating the vibration test under synchronous vibration amplitude, and having better test effect, convenient use and simple operation.
Drawings
FIG. 1 is a schematic diagram of an axial structure of the present utility model;
FIG. 2 is a schematic diagram of the internal drive shaft side structure of the present utility model;
FIG. 3 is a schematic view of the bottom axial side structure of the vibration test stand of the present utility model;
FIG. 4 is a schematic view of the axial side structure of the mounting base of the present utility model;
FIG. 5 is a schematic view of the mounting shaft side structure of the vibration test stand of the present utility model;
FIG. 6 is a schematic view of the drive shaft side of the tension adjusting screw of the present utility model;
FIG. 7 is a schematic view of the axial structure of the vibration driven support of the present utility model;
FIG. 8 is a schematic view of the axial structure of the vibration driving member according to the present utility model;
in the figure: 1. a mounting base; 101. the test bed is provided with a ball head; 2. a vibration test bed; 201. the test bed is provided with a ball socket; 202. a tension spring mounting part; 3. a tension adjusting operation member; 301. tensioning force adjusting the drive bevel gear; 4. tensioning force adjusting screw rod; 401. tensioning force adjusting driven bevel gears; 402. a tension adjusting slide block; 403. a tension spring; 5. a vibration adjusting driving member; 501. vibration adjusting the drive bevel gear; 6. vibrating the driving support; 601. vibration adjusting the driven bevel gear ring; 7. a vibration driving member; 701. the cam is driven by vibration.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.
Referring to fig. 1 to 8, an embodiment of the present utility model provides: a multidimensional vibration test detection device for electromechanical equipment production comprises a mounting base 1; the top spherical surface of the mounting base 1 is connected with a group of vibration test tables 2; a group of tension adjusting operation pieces 3 are rotatably connected to the left side of the mounting base 1; four groups of tension adjusting screw rods 4 are rotationally connected in an array manner in the inner circumference of the mounting base 1; a group of vibration adjusting driving parts 5 are fixedly connected to the right side of the mounting base 1; the upper part of the mounting base 1 is rotatably connected with a group of vibration driving supporting pieces 6; a group of vibration driving pieces 7 are fixedly connected to the upper right side of the vibration driving support piece 6.
Further, the installation base 1 further comprises a test bed installation ball head 101, a group of test bed installation ball heads 101 are fixedly connected to the bottom center of the installation base 1, the vibration test bed 2 further comprises a test bed installation ball socket 201, a group of test bed installation ball sockets 201 are fixedly connected to the top center of the vibration test bed 2, the test bed installation ball heads 101 are in spherical fit with the test bed installation ball sockets 201, and in use, the vibration test bed 2 is in spherical fit with the installation base 1 through the test bed installation ball heads 101 and the spherical fit of the test bed installation ball sockets 201.
Further, the tightening force adjusting operation member 3 further includes a tightening force adjusting drive bevel gear 301, two sets of tightening force adjusting drive bevel gears 301 are coaxially and fixedly connected to the right side of the tightening force adjusting operation member 3, the tightening force adjusting screw 4 further includes a tightening force adjusting driven bevel gear 401, a set of tightening force adjusting driven bevel gears 401 are coaxially and fixedly connected to the inner side of the tightening force adjusting screw 4, each set of tightening force adjusting drive bevel gears 301 is meshed with the two sets of tightening force adjusting driven bevel gears 401 to form a bevel gear transmission mechanism together, and when the tightening force adjusting operation member 3 is rotated, the tightening force adjusting operation member 3 drives the four sets of tightening force adjusting screw 4 to rotate synchronously through the bevel gear transmission mechanism formed by the tightening force adjusting drive bevel gears 301 and the tightening force adjusting driven bevel gears 401.
Further, the tightening force adjusting screw 4 further comprises a tightening force adjusting slide block 402, the outer thread of the tightening force adjusting screw 4 is in transmission connection with a group of tightening force adjusting slide blocks 402, the tightening force adjusting slide blocks 402 are in sliding connection with the mounting base 1, a screw nut transmission pair is jointly formed between the tightening force adjusting screw 4 and the tightening force adjusting slide blocks 402, and in use, when the tightening force adjusting screw 4 rotates, the tightening force adjusting screw 4 drives the tightening force adjusting slide blocks 402 to slide through the screw nut transmission pair jointly formed between the tightening force adjusting screw 4 and the tightening force adjusting slide blocks 402.
Further, the tension adjusting screw 4 further comprises tension springs 403, the top of each group of tension adjusting slide blocks 402 is connected with one group of tension springs 403 in a hanging mode, the vibration test stand 2 further comprises tension spring mounting portions 202, four groups of tension spring mounting portions 202 are arranged at the bottom of the vibration test stand 2 in a circumferential array mode, the other ends of the tension springs 403 are connected with one group of tension spring mounting portions 202 in a hanging mode respectively, in use, the tension of the vibration test stand 2 is achieved through the four groups of tension springs 403, meanwhile, when the four groups of tension adjusting slide blocks 402 slide, the tension adjusting slide blocks 402 change the tension lengths of the four groups of tension springs 403, and accordingly the tension of the vibration test stand 2 is adjusted.
Further, the vibration adjusting driving piece 5 further comprises a vibration adjusting driving bevel gear 501, a group of vibration adjusting driving bevel gears 501 are coaxially and fixedly connected to a rotating shaft of the vibration adjusting driving piece 5, the vibration driving supporting piece 6 further comprises a vibration adjusting driven bevel gear 601, a group of vibration adjusting driven bevel gears 601 are coaxially and fixedly connected to the bottom of the vibration driving supporting piece 6, the vibration adjusting driving bevel gears 501 and the vibration adjusting driven bevel gears 601 are meshed to form a bevel gear transmission mechanism jointly, in use, when the vibration adjusting driving piece 5 rotates, the vibration adjusting driving piece 5 drives the vibration driving supporting piece 6 to rotate through the bevel gear transmission mechanism jointly formed by the vibration adjusting driving bevel gears 501 and the vibration adjusting driven bevel gears 601, and vibration in different directions is simulated through the change of vibration directions caused by the rotation of the vibration driving supporting piece 6.
Further, the vibration driving member 7 further comprises a vibration driving cam 701, a group of vibration driving cams 701 are fixedly connected to the rotating shaft of the vibration driving member 7, the top of the vibration driving cams 701 are in contact with the vibration test stand 2, a cam mechanism is jointly formed between the vibration driving cams 701 and the vibration test stand 2, and in use, the vibration driving member 7 drives the vibration test stand 2 to swing through the cam mechanism jointly formed between the vibration driving cams 701 and the vibration test stand 2.
Working principle: the vibration test bed 2 is in spherical connection with the mounting base 1 through spherical matching of the test bed mounting ball head 101 and the test bed mounting ball socket 201, and tensioning of the vibration test bed 2 and the mounting base 1 is achieved through four groups of tension springs 403; when the vibration test bench is used, the tension adjusting operation piece 3 is rotated, the tension adjusting operation piece 3 drives four groups of tension adjusting screws 4 to synchronously rotate through a bevel gear transmission mechanism formed by meshing the tension adjusting driving bevel gear 301 and the tension adjusting driven bevel gear 401, the tension adjusting screws 4 drive the tension adjusting slide blocks 402 to slide through a screw nut transmission pair formed by the tension adjusting screws 4 and the tension adjusting slide blocks 402, and the tension adjusting slide blocks 402 change the tension lengths of the four groups of tension springs 403 to realize the adjustment of the tension of the vibration test bench 2, so that the vibration amplitude is adjusted; when the vibration adjusting driving piece 5 rotates, the vibration adjusting driving piece 5 is meshed with the vibration adjusting driven bevel gear 601 through the vibration adjusting driving bevel gear 501 to jointly form a bevel gear transmission mechanism to drive the vibration driving supporting piece 6 to rotate, and the vibration driving supporting piece 6 rotates to change the vibration direction so as to simulate vibration in different directions; the vibration driving piece 7 drives the vibration test bed 2 to vibrate through a cam mechanism formed between the vibration driving cam 701 and the vibration test bed 2, and vibration of the workpiece is realized through vibration of the vibration test bed 2.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (1)
1. A multidimensional vibration test detection device for electromechanical device production, its characterized in that: comprises a mounting base (1); the top spherical surface of the mounting base (1) is connected with a group of vibration test tables (2); the left side of the mounting base (1) is rotatably connected with a group of tension adjusting operation pieces (3); four groups of tensioning force adjusting screw rods (4) are rotationally connected with the inner circumference of the mounting base (1) in an array arrangement mode; a group of vibration adjusting driving parts (5) are fixedly connected to the right side of the mounting base (1); the upper part of the mounting base (1) is rotatably connected with a group of vibration driving supporting pieces (6); the upper part of the right side of the vibration driving support piece (6) is fixedly connected with a group of vibration driving pieces (7);
the mounting base (1) further comprises a test bed mounting ball head (101), the bottom center of the mounting base (1) is fixedly connected with a group of test bed mounting ball heads (101), the vibration test bed (2) further comprises a test bed mounting ball socket (201), the top center of the vibration test bed (2) is fixedly connected with a group of test bed mounting ball sockets (201), and the test bed mounting ball heads (101) are in spherical fit with the test bed mounting ball sockets (201);
the tensioning force adjusting operation piece (3) further comprises a tensioning force adjusting driving bevel gear (301), two groups of tensioning force adjusting driving bevel gears (301) are coaxially and fixedly connected to the right side of the tensioning force adjusting operation piece (3), the tensioning force adjusting screw rod (4) further comprises a tensioning force adjusting driven bevel gear (401), a group of tensioning force adjusting driven bevel gears (401) are coaxially and fixedly connected to the inner side of the tensioning force adjusting screw rod (4), and each group of tensioning force adjusting driving bevel gears (301) are respectively meshed with the two groups of tensioning force adjusting driven bevel gears (401) to jointly form a bevel gear transmission mechanism;
the tension adjusting screw rod (4) further comprises: the tensioning force adjusting slide block (402), the outside thread transmission of the tensioning force adjusting screw rod (4) is connected with a group of tensioning force adjusting slide blocks (402), the tensioning force adjusting slide blocks (402) are in sliding connection with the mounting base (1), and a screw nut transmission pair is formed between the tensioning force adjusting screw rod (4) and the tensioning force adjusting slide blocks (402); the top of each group of tension adjusting slide blocks (402) is connected with a group of tension springs (403) in a hanging mode, the vibration test stand (2) further comprises tension spring mounting parts (202), four groups of tension spring mounting parts (202) are arranged at the bottom circumference of the vibration test stand (2) in an array mode, and the other ends of the tension springs (403) are connected with one group of tension spring mounting parts (202) in a hanging mode respectively;
the vibration adjusting driving piece (5) further comprises a vibration adjusting driving bevel gear (501), a group of vibration adjusting driving bevel gears (501) are coaxially and fixedly connected to a rotating shaft of the vibration adjusting driving piece (5), the vibration driving supporting piece (6) further comprises a vibration adjusting driven bevel gear ring (601), a group of vibration adjusting driven bevel gear rings (601) are coaxially and fixedly connected to the bottom of the vibration driving supporting piece (6), and the vibration adjusting driving bevel gears (501) and the vibration adjusting driven bevel gear rings (601) are meshed to form a bevel gear transmission mechanism together;
the vibration driving piece (7) further comprises a vibration driving cam (701), a group of vibration driving cams (701) are fixedly connected to the rotating shaft of the vibration driving piece (7), the tops of the vibration driving cams (701) are in contact with the vibration test bed (2), and a cam mechanism is jointly formed between the vibration driving cams (701) and the vibration test bed (2).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110154897.3A CN112985730B (en) | 2021-02-04 | 2021-02-04 | Multi-dimensional vibration test detection device for electromechanical equipment production |
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| CN202110154897.3A CN112985730B (en) | 2021-02-04 | 2021-02-04 | Multi-dimensional vibration test detection device for electromechanical equipment production |
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| CN112985730B true CN112985730B (en) | 2023-07-11 |
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| CN115389149B (en) * | 2022-10-28 | 2023-01-13 | 湖北鼎万机电设备有限公司 | Anti-seismic support and hanger performance detection system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203490050U (en) * | 2013-09-27 | 2014-03-19 | 西南石油大学 | Spring type simulation vibroscope for test |
| JP3190761U (en) * | 2014-02-20 | 2014-05-29 | アイデックス株式会社 | Vibration and impact test equipment |
| CN105784302A (en) * | 2016-02-02 | 2016-07-20 | 华晨汽车集团控股有限公司 | Automobile modal testing apparatus and method |
| CN106197921A (en) * | 2016-06-23 | 2016-12-07 | 张泓泽 | A kind of adjustable flexible vibration mechine |
| CN106015522A (en) * | 2016-07-12 | 2016-10-12 | 无锡商业职业技术学院 | Gap-adjustable swivel driving device |
| CN106950019B (en) * | 2017-03-01 | 2019-05-10 | 江苏国电新能源装备有限公司 | Photovoltaic tracking bracket low-frequency vibration simulator stand and test method |
| CN107356388B (en) * | 2017-07-25 | 2019-04-30 | 河海大学 | The analogy method of water-turbine top cover bolt mechanical-vibration type fatigue experiment |
| CN109682563B (en) * | 2019-02-13 | 2023-07-25 | 安徽理工大学 | Five-degree-of-freedom metamorphic electromagnetic vibration test bed |
| CN209623989U (en) * | 2019-05-10 | 2019-11-12 | 西南林业大学 | A kind of adjustable civil engineering structure shock test device of direction of vibration |
| CN210953299U (en) * | 2019-10-30 | 2020-07-07 | 鼎今工业装备(大连)有限公司 | Vibration test stand |
| CN211668736U (en) * | 2020-04-01 | 2020-10-13 | 哈尔滨震安科技发展有限公司 | Seismic isolation and reduction environment simulation experiment equipment |
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Effective date of registration: 20240224 Address after: 230000 B-2704, wo Yuan Garden, 81 Ganquan Road, Shushan District, Hefei, Anhui. Patentee after: HEFEI LONGZHI ELECTROMECHANICAL TECHNOLOGY Co.,Ltd. Country or region after: China Address before: 214000 Jiangsu province Wuxi Qian Hu Road No. 809 Patentee before: WUXI INSTITUTE OF COMMERCE Country or region before: China |
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Effective date of registration: 20240515 Address after: 241000 Factory Building No. 3, East Side of Ouyanghu Road, Jiujiang Economic Development Zone, Qingshui Street, Jiujiang District, Wuhu City, Anhui Province Patentee after: Wuhu Yuanhang Intelligent Equipment Co.,Ltd. Country or region after: China Address before: 230000 B-2704, wo Yuan Garden, 81 Ganquan Road, Shushan District, Hefei, Anhui. Patentee before: HEFEI LONGZHI ELECTROMECHANICAL TECHNOLOGY Co.,Ltd. Country or region before: China |