CN110748595B - Automatic guiding telescopic mechanism and telescopic method - Google Patents
Automatic guiding telescopic mechanism and telescopic method Download PDFInfo
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- CN110748595B CN110748595B CN201910938188.7A CN201910938188A CN110748595B CN 110748595 B CN110748595 B CN 110748595B CN 201910938188 A CN201910938188 A CN 201910938188A CN 110748595 B CN110748595 B CN 110748595B
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- stage
- stage sleeve
- sleeve
- guide cylinder
- conical spring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/34—Special valve constructions; Shape or construction of throttling passages
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/36—Special sealings, including sealings or guides for piston-rods
- F16F9/366—Special sealings, including sealings or guides for piston-rods functioning as guide only, e.g. bushings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/36—Special sealings, including sealings or guides for piston-rods
- F16F9/369—Sealings for elements other than pistons or piston rods, e.g. valves
Abstract
The invention discloses an automatic guiding telescopic mechanism which comprises a first-stage sleeve, a second-stage sleeve, a third-stage sleeve and a guiding cylinder, wherein the first-stage sleeve, the second-stage sleeve, the third-stage sleeve and the guiding cylinder are all of a hollow cavity structure; according to the invention, the multistage automatic telescopic process is realized by setting air inlet and air exhaust of the three-position four-way electromagnetic valve and sequentially changing air pressure in the guide cylinder, the third-stage sleeve, the second-stage sleeve and the first-stage sleeve, the structure is more flexible, so that the size of an axial space occupied by the telescopic mechanism is reduced, a larger stroke can be provided, and the first-stage conical spring, the second-stage conical spring and the third-stage conical spring are respectively arranged in the first-stage sleeve, the second-stage sleeve and the third-stage sleeve to realize flexible support and further save space, so that the situation that the installation space is limited can be met.
Description
Technical Field
The invention relates to an automatic guiding telescopic mechanism and a telescopic method.
Background
Common telescopic machanism often uses single ordinary cylindrical spring to reach flexible action and flexible support, but the length ratio of length after ordinary cylindrical spring accomplishes the compression rather than the free state is bigger, and whole flexible can occupy a lot of axial space after the complete compression like this, and in the occasion that installation space is little, uses the telescopic machanism of single ordinary cylindrical spring constitution to receive the restriction, and ordinary cylindrical spring's stroke is unchangeable moreover, is not suitable for the occasion that needs long stroke.
Therefore, it is urgently needed to provide a telescopic mechanism which not only occupies small axial space, but also can provide long stroke.
Disclosure of Invention
The invention aims to overcome the defects and provide an automatic guiding telescopic mechanism.
In order to achieve the purpose, the invention adopts the following specific scheme:
an automatic guiding telescopic mechanism comprises a first-stage sleeve, a second-stage sleeve, a third-stage sleeve and a guide cylinder which are of a hollow cavity structure, wherein a first-stage conical spring, a second-stage conical spring and a third-stage conical spring are arranged in the first-stage sleeve, the second-stage sleeve and the third-stage sleeve respectively, the upper end of the first-stage conical spring is abutted against the second-stage sleeve, the upper end of the second-stage conical spring is abutted against the third-stage sleeve, the upper end of the third-stage conical spring is abutted against the guide cylinder, the second-stage sleeve is sleeved in the first-stage sleeve and divides the interior of the first-stage sleeve into an upper cavity and a lower cavity, the third-stage sleeve is sleeved in the second-stage sleeve and divides the interior of the second-stage sleeve into the upper cavity and the lower cavity, the guide cylinder is sleeved in the third-stage sleeve and divides the interior of the third-stage sleeve into the upper cavity and the lower cavity, and the bottom of the first-stage sleeve is provided with a through hole, the guide cylinder is characterized in that a first channel for communicating a lower cavity of a second-stage sleeve with an upper cavity of a first-stage sleeve is arranged at the bottom of the second-stage sleeve, a second channel is arranged at the lower end of the side wall of the second-stage sleeve and communicated with the first channel, a third channel for communicating a lower cavity of a third-stage sleeve with the upper cavity of the second-stage sleeve is arranged at the bottom of the third-stage sleeve, a fourth channel is arranged at the lower end of the side wall of the third-stage sleeve and communicated with the third channel, a fifth channel for communicating the interior of the guide cylinder with the upper cavity of the third-stage sleeve is arranged at the bottom of the guide cylinder, and a three-position four-way electromagnetic valve is further arranged at the upper end of the interior of the guide cylinder.
In the present invention, preferably, the outsole outer diameter of the first-stage conical spring is greater than the outsole outer diameter of the second-stage conical spring, and the outsole outer diameter of the second-stage conical spring is greater than the outsole outer diameter of the third-stage conical spring.
In the invention, preferably, the lower end of the second-stage sleeve is sleeved with a first-stage sealing ring, the lower end of the third-stage sleeve is sleeved with a second-stage sealing ring, and the lower end of the guide cylinder is provided with a third-stage sealing ring.
In the present invention, preferably, the upper end portion of the first-stage sleeve is provided with a first-stage retainer ring, the upper end portion of the second-stage sleeve is provided with a second-stage retainer ring, and the upper end portion of the third-stage sleeve is provided with a third-stage retainer ring.
The invention has the beneficial effects that: compared with the prior art, the multi-stage automatic telescopic mechanism has the advantages that the air inlet and the air exhaust of the three-position four-way electromagnetic valve are arranged, the air pressure in the guide cylinder, the third-stage sleeve, the second-stage sleeve and the first-stage sleeve is sequentially changed to realize the multi-stage automatic telescopic process, the structure is more flexible, the size of the axial space occupied by the whole telescopic mechanism is reduced, a larger stroke can be provided, the first-stage conical spring, the second-stage conical spring and the third-stage conical spring are respectively arranged in the first-stage sleeve, the second-stage sleeve and the third-stage sleeve to realize flexible support and further save space, and the occasion with limited installation space can be met.
Drawings
Fig. 1 is a schematic structural diagram of an automatic guiding telescopic mechanism provided by an embodiment of the invention in an extended state;
FIG. 2 is a cross-sectional view of the self-guiding retracting mechanism provided in an embodiment of the present invention in an extended state;
FIG. 3 is a schematic structural diagram of an automatic guided telescopic mechanism provided by an embodiment of the present invention in a contracted state;
FIG. 4 is a cross-sectional view of the self-guiding retracting mechanism provided in an embodiment of the present invention in a retracted state;
FIG. 5 is a schematic structural diagram of a three-position, four-way solenoid valve provided in an embodiment of the present invention;
description of reference numerals: 1-a first stage sleeve; 1 a-a via; 2-a second stage sleeve; 3-a third stage sleeve; 4-a guide cylinder; 5-first stage conical spring; 6-second stage conical spring; 7-third stage conical spring; 8-three-position four-way electromagnetic valve; 8 a-an electromagnet; 8 b-a valve core; 9-a first channel; 10-a second channel; 11-a third channel; 12-a fourth channel; 13-a fifth channel; 14-first stage seal ring; 15-second stage sealing ring; 16-third stage seal ring; 17-a first stage retainer ring; 18-a second stage retainer ring; 19-third stage retainer ring.
Detailed Description
The invention will be described in further detail with reference to the following figures and specific examples, without limiting the scope of the invention.
As shown in fig. 1 to 5, the automatic guiding telescopic mechanism of this embodiment includes a first-stage sleeve 1, a second-stage sleeve 2, a third-stage sleeve 3 and a guiding cylinder 4, which are hollow cavity structures, a first-stage cone spring 5, a second-stage cone spring 6 and a third-stage cone spring 7 are respectively disposed in the first-stage sleeve 1, the second-stage sleeve 2 and the third-stage sleeve 3, the upper end of the first-stage cone spring 5 abuts against the second-stage sleeve 2, the upper end of the second-stage cone spring 6 abuts against the third-stage sleeve 3, the upper end of the third-stage cone spring 7 abuts against the guiding cylinder 4, the second-stage sleeve 2 is sleeved in the first-stage sleeve 1 and divides the first-stage sleeve 1 into an upper cavity and a lower cavity, the third-stage sleeve 3 is sleeved in the second-stage sleeve 2 and divides the second-stage sleeve 2 into the upper cavity and the lower cavity, the guiding cylinder 4 is sleeved in the third-stage sleeve 3 and divides the third-stage sleeve 3 into the upper cavity and the lower cavity, the bottom of the first-stage sleeve 1 is provided with a through hole 1a, the bottom of the second-stage sleeve 2 is provided with a first channel 9 which enables a lower cavity of the second-stage sleeve 2 to be communicated with an upper cavity of the first-stage sleeve 1, the lower end of the side wall of the second-stage sleeve 2 is provided with a second channel 10, the second channel 10 is communicated with the first channel 9, the bottom of the third-stage sleeve 3 is provided with a third channel 11 which enables a lower cavity of the third-stage sleeve 3 to be communicated with an upper cavity of the second-stage sleeve 2, the lower end of the side wall of the third-stage sleeve 3 is provided with a fourth channel 12, the fourth channel 12 is communicated with the third channel 11, the bottom of the guide cylinder 4 is provided with a fifth channel 13 which enables the interior of the guide cylinder 4 to be communicated with the upper cavity of the third-stage sleeve 3, and the upper end of the interior of the guide cylinder 4 is further provided with a three-position four-way electromagnetic valve 8; in this embodiment, the cross sections of the first-stage sleeve 1, the second-stage sleeve 2, the third-stage sleeve 3 and the guide cylinder 4 are hexagonal; preferably, the outsole outer diameter of the first-stage conical spring 5 is larger than that of the second-stage conical spring 6, and the outsole outer diameter of the second-stage conical spring 6 is larger than that of the third-stage conical spring 7, so that the second-stage sleeve 2, the third-stage sleeve 3 and the guide cylinder 4 can be expanded and contracted in a layered manner.
The working mode of the embodiment is as follows: as shown in fig. 3, 4 and 5, when the three-position four-way solenoid valve 8 is contracted, the electromagnet 8a in the three-position four-way solenoid valve 8 is in a power-off state, and will not adsorb the valve core 8b in the three-position four-way solenoid valve 8, so that the B, T port of the three-position four-way solenoid valve 8 is not communicated, but the A, P port is communicated, the a port is communicated with the inside of the guide cylinder 4, then gas is injected into the guide cylinder 4 through the a port, the gas pressure inside the guide cylinder 4 is increased, the inside of the guide cylinder 4 is communicated with the upper chamber of the third-stage sleeve 3, so that the gas pressure of the upper chamber of the third-stage sleeve 3 is also increased, under the action of the gas pressure, the guide cylinder 4 automatically extends into the third-stage sleeve 3 and compresses the third-stage conical spring 7, when the guide cylinder 4 completely extends into the third-stage sleeve 3, the upper chamber and the lower chamber of the third-stage sleeve 3 are communicated with the upper chamber of the second-stage sleeve 2 through the third passage 11, therefore, the air pressure of the upper cavity of the second-stage sleeve 2 is increased, the third-stage sleeve 3 automatically extends into the second-stage sleeve 2 and compresses the second-stage conical spring 6, when the third-stage sleeve 3 completely extends into the second-stage sleeve 2, the upper cavity and the lower cavity of the third-stage sleeve 3 are communicated through the second passage 10, and the lower cavity of the second-stage sleeve 2 is communicated with the upper cavity of the first-stage sleeve 1 through the first passage 9, so that the second-stage sleeve 2 automatically extends into the first-stage sleeve 1 and compresses the first-stage conical spring 5 under the action of air pressure, and the whole automatic contraction process is completed; compared with a structure that a one-stage common cylindrical spring is combined with a guide part, the length of the guide cylinder 4 is reduced to one third of that of the one-stage guide part, and the length of each stage of conical spring after compression is reduced to one third of that of the common cylindrical spring, so that the axial space occupied by the whole telescopic mechanism is greatly reduced;
as shown in fig. 1, 2 and 5, when the three-position four-way solenoid valve 8 is extended, the electromagnet 8a in the three-position four-way solenoid valve 8 is in an energized state and adsorbs the valve core 8B in the three-position four-way solenoid valve 8, so that the B, T ports of the three-position four-way solenoid valve 8 are communicated and the A, P port is not communicated, at this time, the B port is communicated with the inside of the guide cylinder 4, the gas in the guide cylinder 4 is discharged through the B port, the gas pressure in the guide cylinder 4 is reduced, and thus the guide cylinder 4 is automatically extended from the inside of the third-stage sleeve 3 under the action of the gas pressure, and similarly, the third-stage sleeve 3 and the second-stage sleeve 2 are also extended respectively, and meanwhile, the first-stage conical spring 5, the second-stage conical spring 6 and the third-stage conical spring 7 are also rebounded to push the second-stage sleeve 2, the third-stage sleeve 3 and the guide cylinder 4 to be extended, so that a long stroke and a flexible support can be provided.
This embodiment is through setting up three-position four-way solenoid valve 8 admit air and exhaust, change guide cylinder 4 in proper order, third level sleeve 3, automatic flexible process is realized to atmospheric pressure in second level sleeve 2 and the first level sleeve 1, the structure is more nimble, thereby reduce the size that telescopic machanism occupy the axial space, can also provide bigger stroke, and at first level sleeve 1, be provided with first level conical spring 5 in second level sleeve 2 and the third level sleeve 3 respectively, second level conical spring 6 and third level conical spring 7 realize the flexible support and further save space, satisfy the restricted occasion of installation space.
As shown in fig. 2, based on the above embodiment, further, the lower end of the second-stage sleeve 2 is sleeved with a first-stage sealing ring 14, the lower end of the third-stage sleeve 3 is sleeved with a second-stage sealing ring 15, and the lower end of the guide cylinder 4 is provided with a third-stage sealing ring 16, so that the structure is more reliable, and air leakage is prevented.
As shown in fig. 1, based on the above embodiment, further, a first-stage retainer ring 17 is disposed at an upper end portion of the first-stage sleeve 1, a second-stage retainer ring 18 is disposed at an upper end portion of the second-stage sleeve 2, and a third-stage retainer ring 19 is disposed at an upper end portion of the third-stage sleeve 3, so that the structure is firmer.
The above description is only a preferred embodiment of the present invention, and all equivalent changes or modifications of the structure, characteristics and principles described in the present patent application are included in the protection scope of the present patent application.
Claims (1)
1. The telescoping method of the automatic guiding telescoping mechanism is characterized in that the automatic guiding telescoping mechanism comprises a first-stage sleeve (1), a second-stage sleeve (2), a third-stage sleeve (3) and a guide cylinder (4) which are hollow cavity structures, wherein a first-stage conical spring (5), a second-stage conical spring (6) and a third-stage conical spring (7) are respectively arranged in the first-stage sleeve (1), the second-stage sleeve (2) and the third-stage sleeve (3), the upper end of the first-stage conical spring (5) abuts against the second-stage sleeve (2), the upper end of the second-stage conical spring (6) abuts against the third-stage sleeve (3), the upper end of the third-stage conical spring (7) abuts against the guide cylinder (4), the second-stage sleeve (2) is sleeved in the first-stage sleeve (1) and divides the interior of the first-stage sleeve (1) into an upper cavity and a lower cavity, the third-stage sleeve (3) is sleeved in the second-stage sleeve (2) and divides the inside of the second-stage sleeve (2) into an upper cavity and a lower cavity, the guide cylinder (4) is sleeved in the third-stage sleeve (3) and divides the inside of the third-stage sleeve (3) into the upper cavity and the lower cavity, a through hole (1 a) is formed in the bottom of the first-stage sleeve (1), a first channel (9) enabling the lower cavity of the second-stage sleeve (2) to be communicated with the upper cavity of the first-stage sleeve (1) is formed in the bottom of the second-stage sleeve (2), a second channel (10) is formed in the lower end of the side wall of the second-stage sleeve (2), the second channel (10) is communicated with the first channel (9), a third channel (11) enabling the lower cavity of the third-stage sleeve (3) to be communicated with the upper cavity of the second-stage sleeve (2) is formed in the bottom of the third-stage sleeve (3), a fourth channel (12) is formed in the lower end of the side wall of the third-stage sleeve (3), the fourth channel (12) is communicated with the third channel (11), a fifth channel (13) which enables the interior of the guide cylinder (4) to be communicated with the upper cavity of the third-stage sleeve (3) is arranged at the bottom of the guide cylinder (4), a three-position four-way electromagnetic valve (8) is further arranged at the upper end of the interior of the guide cylinder (4), the outer diameter of the large bottom of the first-stage conical spring (5) is larger than that of the large bottom of the second-stage conical spring (6), the outer diameter of the large bottom of the second-stage conical spring (6) is larger than that of the large bottom of the third-stage conical spring (7), a first-stage sealing ring (14) is sleeved at the lower end of the second-stage sleeve (2), a second-stage sealing ring (15) is sleeved at the lower end of the third-stage sleeve (3), and a third-stage sealing ring (16) is arranged at the lower end of the guide cylinder (4); a first-stage check ring (17) is arranged at the upper end part of the first-stage sleeve (1), a second-stage check ring (18) is arranged at the upper end part of the second-stage sleeve (2), and a third-stage check ring (19) is arranged at the upper end part of the third-stage sleeve (3); the telescoping method comprises the following steps: when the three-position four-way electromagnetic valve is contracted, an electromagnet (8 a) in the three-position four-way electromagnetic valve is in a power-off state and cannot adsorb a valve core (8 b) in the three-position four-way electromagnetic valve (8), so that an B, T port of the three-position four-way electromagnetic valve 8 is not communicated, a A, P port of the three-position four-way electromagnetic valve is communicated, an A port of the three-position four-way electromagnetic valve is communicated with the interior of a guide cylinder (4), then gas is injected into the guide cylinder (4) through the A port, the gas pressure in the guide cylinder (4) is increased, the interior of the guide cylinder (4) is communicated with an upper cavity of a third-stage sleeve (3), so that the gas pressure in the upper cavity of the third-stage sleeve (3) is also increased, the guide cylinder (4) automatically extends into the third-stage sleeve (3) and compresses a third-stage cone spring (7) under the action of gas pressure, and after the guide cylinder (4) completely extends into the third-stage sleeve (3), at the moment, a fourth channel (12) communicates the upper cavity with a lower cavity of the third-stage sleeve (3), the lower cavity of the third-stage sleeve (3) is communicated with the upper cavity of the second-stage sleeve (2) through a third channel (11), so that the air pressure of the upper cavity of the second-stage sleeve (2) is increased, the third-stage sleeve (3) automatically extends into the second-stage sleeve (2) and compresses the second-stage conical spring (6), when the third-stage sleeve (3) completely extends into the second-stage sleeve (2), the upper cavity and the lower cavity of the third-stage sleeve (3) are communicated through the second channel (10), the lower cavity of the second-stage sleeve (2) is communicated with the upper cavity of the first-stage sleeve (1) through the first channel (9), and therefore the second-stage sleeve (2) can automatically extend into the first-stage sleeve (1) and compress the first-stage conical spring (5) under the action of air pressure, and the whole automatic contraction process is completed; compared with a structure that one-level common cylindrical spring is combined with a guide part, the telescopic mechanism after contraction has the advantages that the length of the guide cylinder (4) is reduced to one third of the length of the one-level guide part, the length of each level of conical spring after compression is reduced to one third of the length of the common cylindrical spring, and further the axial space occupied by the whole telescopic mechanism is greatly reduced.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910938188.7A CN110748595B (en) | 2019-09-30 | 2019-09-30 | Automatic guiding telescopic mechanism and telescopic method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910938188.7A CN110748595B (en) | 2019-09-30 | 2019-09-30 | Automatic guiding telescopic mechanism and telescopic method |
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| CN110748595A CN110748595A (en) | 2020-02-04 |
| CN110748595B true CN110748595B (en) | 2021-12-31 |
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| CN112260443B (en) * | 2020-10-26 | 2021-05-04 | 德庆通达电机有限公司 | Mobile motor with shutdown shaft closing mechanism and use method thereof |
| CN112474980B (en) * | 2020-11-10 | 2022-12-27 | 长沙超旋机械科技有限责任公司 | Uniform heating spinning device and spinning method for end socket piece |
| CN113089274B (en) * | 2021-03-23 | 2022-03-01 | 珠海格力电器股份有限公司 | Washing barrel assembly, washing machine and control method of washing machine |
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| CN201461600U (en) * | 2009-07-29 | 2010-05-12 | 贵州枫阳液压有限责任公司 | Two-stage locking cylinder |
| CN204253497U (en) * | 2014-10-14 | 2015-04-08 | 北京工业大学 | A kind of multi-stage cylinder of sequentially-operating |
| CN207388788U (en) * | 2017-10-31 | 2018-05-22 | 西安科技大学 | A kind of damp adjustable self energizing type active suspension actuator of electric |
| CN108591173A (en) * | 2018-05-10 | 2018-09-28 | 安徽江淮汽车集团股份有限公司 | A kind of solenoid valve and double acting two-stage gas cylinder control assembly |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2385151B1 (en) * | 2010-12-23 | 2013-02-18 | Abengoa Solar New Technologies S.A. | MECHANISM OF TURNING STRUCTURAL SUPPORTS OF OLEOHIDRÁULIC DRIVE. |
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|---|---|---|---|---|
| CN201461600U (en) * | 2009-07-29 | 2010-05-12 | 贵州枫阳液压有限责任公司 | Two-stage locking cylinder |
| CN204253497U (en) * | 2014-10-14 | 2015-04-08 | 北京工业大学 | A kind of multi-stage cylinder of sequentially-operating |
| CN207388788U (en) * | 2017-10-31 | 2018-05-22 | 西安科技大学 | A kind of damp adjustable self energizing type active suspension actuator of electric |
| CN108591173A (en) * | 2018-05-10 | 2018-09-28 | 安徽江淮汽车集团股份有限公司 | A kind of solenoid valve and double acting two-stage gas cylinder control assembly |
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Effective date of registration: 20230406 Address after: 314100 Building 1, No. 82, Huicheng Road, Huimin street, Jiashan County, Jiaxing City, Zhejiang Province Patentee after: Jiaxing Wandi Machinery Technology Co.,Ltd. Address before: 416-1c-9, 4th floor, Zhixin science and technology complex building, No.15 Xinghuo Road, Jiangbei new district, Nanjing City, Jiangsu Province, 210000 Patentee before: Da Yingke (Nanjing) equipment Co.,Ltd. |